JPH10273041A - Self-propelled transport trolley and transport equipment - Google Patents

Abstract

(57) [Problem] To provide a self-propelled transport vehicle capable of shifting without damaging a power transmission unit and improving stop accuracy. A transport facility includes a rail, a self-propelled transport vehicle, and a turntable. The self-propelled carriage 4 includes a carriage main body, a cockpit section, a ladle, and a drive section 24.
The drive unit 24 includes a power transmission unit 28 connected to an axle 25.
And a hydraulic motor 29. A hydraulic unit 30 is connected to the hydraulic motor 29 via a duty control valve 32. The power transmission unit 28 includes a drive shaft 35 parallel to the axle 25 and connected to the motor 29, and a fixed shaft 36 provided between the drive shaft 35 and the axle 25. The drive shaft 35 is provided with a shift spur gear 38 slidable in the axial direction. On the fixed shaft 36, the first transmission spur gear 4
4 and a low-speed gear section 47 are provided. The axle 25 is provided with a driven gear 51.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-propelled transport vehicle and a transport facility for transporting heavy objects such as metals melted in a furnace of a foundry, for example, to a position away from the furnace such as a mold.

[0002]

2. Description of the Related Art A metal is heated and melted at a high temperature, and the melted metal is poured into a mold. After the metal is solidified, the mold is removed, and a metal product having a required shape is manufactured. 2. Description of the Related Art Conventionally, in a pressure forming line, a molten metal of a molten metal is transported from a furnace to a mold using a transport facility 100 as shown in FIG.

[0003] The conventional transport equipment 100 comprises a rail 3 laid on a floor 2 or the like as shown in FIG. 16 and a self-propelled transport vehicle 10 which runs on the rail 3 as shown in FIG.
1 and so on.

[0004] As shown in FIG. 16, the rail 3 is mounted on a floor so that the self-propelled carrier 101 travels from, for example, first to fourth melting furnaces 5, 6, 7, 8 to a plurality of molds 9. It is laid in 2nd class.

The rail 3 has a first line section 11 passing near the plurality of molds 9, and extends substantially perpendicularly from the first line section 11, and has the first to third melting furnaces 5, 6. ,
7, a third line section 13 bent from the second line section 12 and extending toward the fourth melting furnace 8, and the first line section 11 Turntable 14 disposed at a position connecting the second line portion 12 and the second turntable 12, and a second turntable disposed at a position connecting the second line portion 12 and the third line portion 13. 15 is provided.

[0006] As shown in FIG.
A bogie body 21 mounted with a pair of left and right wheels 20, 20 running on the rail 3, a cockpit portion 22 for an operator or the like to drive, a ladle 23 for storing molten metal, Drive unit 102 for driving wheels 20
And

[0007] As shown in FIG. 17, the drive unit 102 is provided with a power transmission unit 103 connected to the wheels 20.
And a hydraulic motor 104 connected to the power transmission unit 103 and supplying power. The hydraulic motor 104 is connected to a hydraulic unit 105 that supplies hydraulic oil to the motor 104. This hydraulic unit 1
The manual valve 106 is provided between the hydraulic motor 104 and the hydraulic motor 104.

The opening of the manual valve 106 is controlled by an operator, and has a function of changing the amount of oil supplied to the hydraulic motor 104 and controlling the torque generated by the hydraulic motor 104 and the like. The output shaft 107 of the hydraulic motor 104 is provided so as to be substantially parallel to an axle 108 connecting the pair of wheels 20 and 20 to each other.

The power transmission unit 103 is connected to the output shaft 107 of the hydraulic motor 104 and
A right-angle transmission unit 110 transmitting the torque generated by the first bevel gear 109 in a substantially right-angle direction and having a first bevel gear 109 at the end.
And a second bevel gear 111 meshing with the first bevel gear 109 and connected to the axle 108. The first bevel gear 109 and the second bevel gear 111 are meshed with each other such that their rotation surfaces are perpendicular to each other.

With the above-described structure, the power transmission unit 103 transmits the torque generated by the hydraulic motor 104 to the axle 108 via the bevel gears 109 and 111 to rotate the wheels 20 and 20.

[0011]

The self-propelled transport vehicle 101 used in the above-described conventional transport equipment 100 drives a hydraulic motor 104 using hydraulic oil supplied from a hydraulic unit 105, so that the axle 108 The vehicle is traveling by transmitting power.

However, the self-propelled transport vehicle 10 for transporting the molten metal
1 has a weight of, for example, more than 20 tons,
The bevel gears 109 and 111 of the power transmission unit 103 for transmitting the power from the hydraulic motor 104 to the axle 108 may be damaged due to insufficient strength, which has been a factor for lowering productivity such as reworking the transport vehicle.

Further, when the molten metal is cast into the mold 9 in the first line section 11, the amount of hydraulic oil supplied from the hydraulic unit 105 and driving the hydraulic motor 104 is controlled using a manual valve 106. Therefore, if the carriage 4 is repeatedly run and stopped in small increments, the stop accuracy is deteriorated, and the stop time is prolonged due to insufficient strength of the bevel gears 109 and 111, thereby reducing productivity. .

Further, melting furnaces 5, 6, 7, 8 shown in FIG.
Similarly, when the bogie 101 travels from the first turntable 14 to the first turntable 14, it is difficult to travel at a high speed due to the insufficient strength of the bevel gears 109 and 111, which is a factor that lowers productivity.

Accordingly, an object of the present invention is to improve the strength so as not to damage the power transmission unit of the self-propelled carrier, suppress the increase in weight as much as possible, and improve the stopping accuracy and reliability of the vehicle. It is an object of the present invention to provide a self-propelled transport vehicle and transport equipment that can be achieved.

[0016]

According to a first aspect of the present invention, there is provided a self-propelled transport vehicle according to the first aspect of the present invention, which travels on a pair of rails laid on a floor. A motor for driving an axle of the bogie main body, and a power transmission unit coupled to an output shaft of the motor, wherein the power transmission unit is provided with a drive shaft interlocked with an output shaft of the motor. A shift spur gear movably provided in the axial direction over a first position and a second position, a first speed change spur gear meshed with the shift spur gear at the first position, A second transmission spur gear in which the shift spur gear meshes at the second position; a high-speed gear that transmits rotation of the first transmission spur gear to the axle; and a second transmission spur gear. And a low-speed gear that transmits rotation to the axle. A moving-side gear portion, and shift driving means for moving the shift spur gear to mesh the shift spur gear with one of the first speed-change spur gear and the second speed-change spur gear. , And the transport speed of the carriage body is switched.

According to a second aspect of the present invention, there is provided a self-propelled carrier having a rail laid on a floor and a motor for driving an axle supporting wheels for traveling on the rail. A turntable for changing the direction of the self-propelled carrier in a state where the self-propelled carrier is lifted off the rail by a lift means provided at a location where the rail tracks intersect, The self-propelled carrier has a power transmission unit connected to an output shaft of the motor, and the power transmission unit has a first position and a second position in an axial direction of a drive shaft interlocked with the output shaft of the motor. A shift spur gear movably provided over
A first transmission spur gear in which the shift spur gear meshes at the first position; a second transmission spur gear in which the shift spur gear meshes at the second position; A driven gear portion having a high-speed gear for transmitting rotation of a speed-change spur gear to the axle and a low-speed gear for transmitting rotation of the second speed-change spur gear to the axle; and moving the shift spur gear. Shift driving means for meshing the shift spur gear with one of the first and second shift spur gears, and the self-propelled transport vehicle is moved by the lift means. By driving the shift driving means in a state where the rotation of the wheels is free by pushing up, the shift spur gear is moved to the first position or the second position.
In which the transfer speed and the transfer direction of the self-propelled transfer vehicle can be changed.

As a result of taking the above-described measures, the following operation occurs. In the self-propelled transport vehicle according to the first aspect, the motor torque is increased by sliding the shift spur gear of the power transmission unit to the first position or the second position. The power is transmitted to the axle via the second transmission spur gear.

Further, in the transfer equipment according to the present invention, the self-propelled transfer carriage may be lifted by the lifting means of the transfer equipment so that the wheels are freely rotated.
The shift driving means moves the shift spur gear of the power transmission unit along the axis of the drive shaft and meshes with one of the first shift spur gear and the second shift spur gear. The gears of the unit do not break.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In the static pressure molding line for producing metal products in the same manner as in the conventional example, the transport equipment 1 includes a pair of rails 3 and 3 laid on a floor 2 or the like as shown in FIG. , 6,
The apparatus is provided with equipment for supplying and distributing a molten metal made of metal or the like from 7, 8 and a self-propelled transport vehicle 4 for self-running on the rail 3 and casting the molten metal in a mold 9.

As shown in FIG. 16, the static pressure molding line provided with the transfer equipment 1 composed of the rail 3 and the self-propelled transfer carriage 4 has, for example, first to fourth melting furnaces 5, 6, 7,.
8 and a plurality of molds 9.

In the illustrated example, the mold 9 is arranged such that the receiving ports 10 into which the molten metal is poured are substantially aligned with each other. The first to third melting furnaces 5, 6, and 7 are arranged such that the receiving ports 10 of the mold 9 are on a straight line extending in a substantially perpendicular direction from the lines arranged together. 4th
The melting furnace 8 has a straight line formed with the third smelting furnace 7 from the conveying path provided with the first to third smelting furnaces 5, 6, and 7 to a straight line connecting the receiving ports 10 to each other. It is arranged to bend slightly toward.

The rail 3 includes a first line section 11 provided substantially parallel to a straight line connecting the receiving ports 10 of the mold 9 to each other, and the first to third melting furnaces 5, 6, and 7. And a third line portion provided along a straight line connecting the third smelting furnace 7 and the fourth smelting furnace 8 to each other. 13, a first turntable 14 for line switching provided at a point where lines between the first line portion 11 and the second line portion 12 intersect, and a second line portion 12 A second turntable 15 for line switching provided at a location where the line between the third line section 13 and the third line section 13 intersects.

The first line portion 11 is formed so that the interval between the receiving ports 10 of the molds 9 is relatively narrow, so that the stop interval of the self-propelled carriage 4 is relatively short. Has become. Since the interval between the first to third melting furnaces 5, 6, and 7 is relatively wide in the second line section 12, the stop interval of the self-propelled carrier 4 is relatively long. Has become.

The first turntable 14 moves the self-propelled carrier 4 from the first track section 11 to the second track section 12 or from the second track section 12 to the first track section 11.
In order to switch the line, the rotation is performed about the axis along the arrow K in the drawing. Similarly to the first turntable 14, the second turntable 15 is also connected from the second line section 12 to the third line section 13, or the third line section 13 or the second line section. In order to switch the track of the self-propelled carrier 4 to 12, it rotates along the arrow K in the figure.

On the first turntable 14 and the second turntable 15, the self-propelled carrier 4 is connected to the track sections 11, 12, 13 from different track sections 11, 12, 13.
Lifting means 70 is provided to push up the self-propelled transport vehicle 4 from below when transferring to the transport vehicle. The lift means 70 is provided between the rails 3 and 3 so as to be able to protrude from the floor 2 by connecting a cylinder or the like (not shown).

The lift means 70 projects from the floor 2 as shown in FIG. 1 when the self-propelled carriage 4 is positioned on the turntables 14 and 15, and the tip thereof moves the carriage body 21 of the carriage 4 to be described later. It supports and supports wheels 20 (described later) of the carriage 4.
Are raised from the rails 3,3.

A plurality of metal pieces 18 for activating a proximity sensor group 54 described later due to the presence of the carriage 4 are buried between the rails 3 and 3. With the configuration described above,
The self-propelled transport vehicle 4 includes first to fourth melting furnaces 5, 6,
The vehicle can travel between 7, 8 and the mold 9.

As shown in FIG. 15, the self-propelled transport vehicle 4
A bogie main body 21 on which wheels 20 and the like running on the rail 3 are mounted, and a cockpit section 2 for an operator or the like to drive.
2, a ladle 23 for storing the molten metal, and a drive unit 24 for driving the wheels 20.

The bogie main body 21 is provided with a pair of rollable wheels 20 at a front portion and a rear portion in a running longitudinal direction thereof, and the pair of wheels 20 and 20 are connected to each other by an axle 25 and are pivotally supported. The self-propelled carrier 4 is connected to the rail 3
It can run on the top.

The cockpit section 22 has a window 26 formed so as to be operable by an operator, and through which the operator can observe the molten metal pouring condition. In the cockpit section 22, the operator operates the self-propelled carrier 4 such as running and stopping.

The ladle 23 is made of a material having high heat resistance so as to accommodate the molten metal supplied from the first to fourth melting furnaces 5, 6, 7, 8 and the like. A pouring port 27 for pouring the molten metal into the receiving port 10 is provided.

During the traveling of the self-propelled carrier 4, the ladle 23 holds the pouring port 27 as indicated by a solid line in the drawing.
When the molten metal is poured into the receiving port 10 of the mold 9, the pouring port 27 approaches the receiving port 10 as shown by a two-dot chain line Q in the drawing. It is driven in the direction.

The drive unit 24 includes a power transmission unit 28 connected to the axle 25 as shown in FIGS.
And a hydraulic motor 29 connected to the power transmission unit 28 to supply power.

The hydraulic motor 29 includes the motor 29
Is connected to a hydraulic unit 30 for supplying hydraulic oil to the hydraulic pump.
A duty control valve 32 driven by a stepping motor 31 is provided between the hydraulic unit 30 and the hydraulic motor 29.

The opening of the duty control valve 32 is controlled by the stepping motor 31 to change the amount of oil supplied to the hydraulic motor 29 to control the torque generated by the hydraulic motor 29. I have. The output shaft 33 of the hydraulic motor 29 is disposed so as to be substantially parallel to the axle 25.

The power transmission unit 28 is connected to an output shaft 33 of the hydraulic motor 29 via a joint 34 and is arranged in parallel with the axle 25, the drive shaft 35 and the axle 25 A fixed shaft 36 disposed in parallel with the axle 25, and a gear 38, which will be described later, provided on the drive shaft 35, the fixed shaft 36 and the axle 25,
It comprises a housing 37 surrounding 44, 47, 51 and the like.

The drive shaft 35 is interlocked with the output shaft 33 of the motor 29 and is slidable in the axial direction.
The shift spur gear 38 which is concentric with each other when viewed from the side is provided as shown in FIG. This shift spur gear 38
As shown in FIG. 1, the carriage 4 is sandwiched by holding members 39 from the left and right directions.

The holding member 39 is connected to a hydraulic cylinder 40 which extends through the housing 37 of the power transmission unit 28 and extends and contracts along the drive shaft 35. The hydraulic cylinder 40 expands and contracts, so that the shift spur gear 38
Is slid from the position shown in FIG. 13 to the position shown in FIG. The hydraulic cylinder 40 and the holding member 39 constitute shift driving means described in this specification.

A position where the shift spur gear 38 meshes with a first speed-change spur gear 44 described later is a first position described in this specification as shown in FIG.
The position where the above-described shift spur gear 38 meshes with the second speed-change spur gear 44 described later is referred to as a second position as shown in FIG.

A bearing 41 is provided between the drive shaft 35 and the housing 37. The drive shaft 35 and the shift spur gear 38 are in spline engagement with each other as shown in FIG.
When the 5 rotates, the shift spur gear 38 also surely rotates.

A projection 42 is integrally provided above the holding member 39. The casing 37 has the shift spur gear 38 and the holding member 39 as shown in FIGS.
4, a pair of contact sensors 43 are provided along the extension and contraction direction of the hydraulic cylinder 40, the contact sensors 43 being in contact with the projections 42.

The fixed shaft 36 is fixed to the housing 37. On the fixed shaft 36, a first transmission spur gear 44, which is relatively large as compared with the shift spur gear 38, and a low-speed gear portion 47 are provided concentrically with each other as viewed from the side.

The low-speed gear unit 47 includes a relay gear 45 formed to have an intermediate size between the shift spur gear 38 and the first speed-change spur gear 44, and the first speed-change spur gear 4.
Second spur gear 4 having a size substantially equal to 4
And 6 are integrally provided so as to be concentric with each other.

When the shift spur gear 38 is moved to the first position shown in FIG. 14 by the hydraulic cylinder 40, the first shift spur gear 44
And 8 mesh with each other.

Similarly, the second speed changing spur gear 46 of the low speed gear portion 47 is moved when the shifting speed gear 38 is moved to the second position shown in FIG.
And 8 mesh with each other. The low-speed gear portion 47 is arranged such that the relay gear 45 having a small diameter faces the first speed-changing spur gear 44.

As shown in FIG. 2, between the fixed shaft 36 and the low-speed gear 47 and the first transmission spur gear 44.
A bearing 48 is provided as shown in FIG. The bearing 48 allows the low-speed gear portion 47 and the first
When the transmission spur gear 44 rotates, the fixed shaft 36 does not hinder the rotation.

The axle 25 is provided with a driven gear 51. The driven-side gear portion 51 meshes with the relay gear 45 of the low-speed gear portion 47 and has a low-speed gear 49 substantially the same size as the relay gear 45.
And a high-speed gear 50 that meshes with the first transmission spur gear 44 and is smaller than the shift spur gear 38 so as to be concentric with each other.

The axle 25 and the driven gear 5
2 is fixed by spline engagement with each other as shown in FIG. 2, so that when the driven gear portion 51 rotates, the axle 25 also surely rotates.

A pair of left and right wheels 20 is provided at both left and right ends of the axle 25 via joints 34. Each wheel 20 is sandwiched from the left and right by a chassis member 53 connected to the axle 25 via a bearing 52. The chassis member 53 is mounted on the carriage body 2.
1. As described above, since the chassis member 53 is connected to the axle 25 via the bearing 52,
The rotation of the axle 25 is not hindered.

In the state shown in FIG. 1, the shift spur gear 38 of the power transmission unit 28 does not mesh with the low-speed gear portion 47 or the first speed-change spur gear 44. The torque to be applied to wheels 2
Don't tell 0. At this time, the self-propelled transport vehicle 4 is kept stopped.

As shown in FIG. 13, the shift spur gear 3
8 is moved by the hydraulic cylinder 40 to the low speed gear 47
Is moved to a position where the second gear is engaged with the second speed change gear 46, the torque generated by the hydraulic motor 29 is transmitted from the relay gear 45 of the low speed gear 47 to the low speed gear 49 of the driven gear 51. It will be. Then, the self-propelled carrier 4 travels as the wheels 20 rotate.

Next, as shown in FIG. 14, when the shift spur gear 38 is moved by the hydraulic cylinder 40 to a position where it meshes with the first shift spur gear 44, the torque generated by the hydraulic motor 29 becomes , The first transmission spur gear 4
4 to the high-speed gear 50 of the driven gear portion 51. Then, the self-propelled carrier 4 travels as the wheels 20 rotate. At this time, compared to the state shown in FIG. 13, the torque generated by the hydraulic motor is transmitted from a relatively large gear (first spur gear 44) to a relatively small gear (high-speed gear 50). Self-propelled carrier 4
Will run at a relatively high speed.

The carriage body 21 of the self-propelled carriage 4
A proximity sensor group 54 is provided at the lower part of the area as shown in FIG. The proximity sensor group 54 senses a metal piece 18 installed between the rails 3.
When the metal piece 18 is detected, the duty control valve 32
Is transmitted to a stepping motor 31 or the like for controlling the opening of the motor.

In the illustrated example, the proximity sensor group 54
Is composed of a plurality of proximity sensors, and includes, in order from the left, an abnormal stop sensor 55, a zone division sensor 56, a first deceleration condition sensor 57, a fixed position stop sensor 58, and a second deceleration condition sensor 59.

In the rail 3, as shown in FIGS. 4, 7 to 9 and 12, the vicinity of the first to fourth melting furnaces 5, 6, 7, 8 and the mold 9, and in FIGS. As shown in FIG. 10, at both ends of the second line section 12, a metal piece 60 for a deceleration condition formed relatively long along the rail 3 at a position corresponding to the second deceleration condition sensor 59.
And a fixed-position stop metal piece 61 formed at a position corresponding to the fixed-position stop sensor 58 and substantially at the center of the deceleration condition metal piece 60, which is relatively short. The deceleration condition metal piece 60 and the fixed position stop metal piece 61 shown in FIG. 4 are provided near all the molds 9 as shown in FIG.

As shown in FIG. 11, at the end of the third track portion 13 on the side of the second turntable 15, the turntable 15 and the rail 3 provided on the turntable 15 are connected. When the rail 3 provided on the track portion 13 of FIG.
The metal pieces 60 for deceleration condition are provided as if they were integrated with the metal pieces 60 and 61 shown in FIG.

The self-propelled carrier 4 corresponds to FIGS.
When the vehicle reaches the position shown in FIG. 2, first, the second deceleration condition sensor 59 senses the deceleration condition metal piece 60 and transmits this information to the stepping motor 31. Then, the stepping motor 31 gradually closes the opening of the duty control valve 32 and the torque generated by the hydraulic motor 29 decreases, so that the speed of the carriage 4 gradually decreases.

Then, the fixed position stop sensor 58 detects the fixed position stop metal piece 61 and transmits this information to the stepping motor 31. Then, the stepping motor 31 completely closes the opening of the duty control valve 32 and the hydraulic motor 29 stops, so that the carriage 4 stops near the melting furnaces 5, 6, 7, 8 and the mold 9.

Further, as shown in FIG. 5 and the like, the stop interval of the bogie 4 including the second track portion 12 and the third track portion 13 is relatively wide, that is, the bogie 4 can run at a relatively high speed. The boundary between the range and the range in which the stop interval of the bogie 4 including the first track portion 11 is relatively narrow, that is, the range in which the bogie 4 must travel at a relatively low speed, corresponds to the zone division sensor 56. The metal piece 62 for the zone division is provided at the position where the zone is to be formed.

When the self-propelled transport vehicle 4 reaches the position where the zone section metal pieces 62 are provided, the zone section sensor 56 senses the zone section metal pieces 62 and can travel at a relatively high speed. The fact that the vehicle has reached the boundary between the range and the range where the vehicle must travel at a low speed is communicated to the operator in the cockpit unit 22.

As shown in FIGS. 4, 5, 10 and 12, the ends of the line portions 11, 12, and 13 are provided at the positions corresponding to the abnormal stop sensor 55 with the abnormal stop metal pieces 6.
3 are provided. If the self-propelled transport vehicle 4 is used as the track parts 11, 12, and 10 shown in FIG. 4, FIG. 5, FIG.
In the case where the deceleration sensor 59 and the fixed position stop sensor 58 do not stop at the end of the thirteen, the abnormal stop sensor 55 detects the abnormal stop metal piece 63 and stops the self-propelled carrier 4 in an emergency. It is supposed to.

Next, the operation of the self-propelled transport vehicle 4 and the transport equipment 1 configured as described above will be described. First, when the self-propelled transport vehicle 4 is on the second track portion 12 of the rail 3,
The vehicle is traveling toward the first turntable 14 along the arrow J shown in FIG. At this time, the ladle 23 of the self-propelled transport vehicle 4 is in a state of being filled with the molten metal. Further, the power transmission unit 28 has a structure in which the second line portion 12 has a relatively wide stop interval range,
As shown in FIG. 4, the shift spur gear 38 and the first shift spur gear 44 mesh with each other. For this reason,
The self-propelled carrier 4 travels at a relatively high speed.

When approaching the first turntable 14, the second deceleration condition sensor 59 detects the deceleration condition metal piece 60 as shown in FIG. Will decelerate.

After that, the fixed position stop sensor 58 detects the fixed position stop metal piece 61, and the first turntable 1
In the vicinity of 4, the self-propelled carrier 4 stops. After the turntable 14 is rotated until the rails 3 on the turntable 14 and the rails 3 of the second track section 12 are aligned with each other, the self-propelled carrier 4 moves to the first turntable 14.
To enter.

When the self-propelled carrier 4 enters the first turntable 14, the lift means 70 is protruded from the turntable 14 by a cylinder (not shown).
The lifting means 70 pushes up the bogie main body 21 from below, so that the wheels 20 are lifted off the rails 3 and 3.

In the state described above, the first turntable 14 is rotated along the arrow K in the drawing to change the direction of the self-propelled carrier 4. At this time, since the wheels 20 are lifted off the rails 3 and 3, careless movement of the carriage 4 is prevented, and the ladle 23 is rotated during rotation of the first turntable 14.
The trolley 4 is surely changed its course to the first track portion 11 without spilling molten metal from the trolley 4.

Since the first line section 11 is in a range where the stop interval is relatively narrow, the shift spur gear 70 is shown in FIG. 14 by using the hydraulic cylinder 40 in a state where it is pushed up from below by the lift means 70. FIG. 13 from the first position
To the second position shown in FIG. At the time of this switching, the cart 4 is in a state where the rotation of the wheels 20 is free. Therefore, even if the self-propelled carrier 4 weighs more than, for example, 20 tons, the spur gears 38 and 44 are not damaged at the time of the switching.

The self-propelled carrier 4 whose track has been changed to the first track section 11 is provided with the shift spur gear 3 of the power transmission unit 28.
Since 8 has been switched to the second position as described above, it approaches the mold 9 at a relatively slow speed. Then, when approaching the position where the deceleration condition metal piece 60 is buried, the carriage 4 moves the deceleration condition metal piece 6 in the same manner as described above.
0 and the second deceleration condition sensor 59 gradually decelerates, then the fixed position stop metal piece 61 and the fixed position stop sensor 58
As a result, the vehicle stops near the mold 9.

At this time, the power transmission unit 28 of the truck 4
Is in the second position and the hydraulic motor 2
9 is controlled using the duty control valve 32, the time required for the stop is about half as compared with the case where the operator controls the oil amount with the manual valve 106, and the stop accuracy is also improved. Will be improved.

Then, the ladle 23 is replaced with a two-dot chain line Q in FIG.
The state is shifted to a state in which the molten metal is poured into the receiving port 10 as shown in FIG. At this time, as described above, the stop accuracy of the self-propelled transport vehicle 4 is less than half as compared with the case where the manual valve 106 is used, so that the molten metal is surely poured into the receiving port 10 without spilling. Becomes

In the first line section 11, the self-propelled carrier 4 repeats the step of pouring the molten metal into the plurality of molds 9. When the molten metal in the ladle 23 is exhausted, the carriage 4 travels from the first turntable 14 toward the vicinity of any one of the melting furnaces 5, 6, 7, and 8. At this time, the power transmission unit 2
The shift spur gear 38 of No. 8 is switched from the second position to the first position on the first turntable 14, contrary to the above.

By repeating the above steps, a molten metal made of metal or the like melted in the melting furnaces 5, 6, 7, and 8 is poured into the mold 9 to produce a casting. According to the above-described configuration, the duty control valve 32 whose opening is controlled by the stepping motor 31 between the hydraulic motor 29 that drives the self-propelled carrier 4 and the hydraulic unit 30 that supplies hydraulic oil to the hydraulic motor 29. And the shift spur gear 3 of the power transmission unit 28 for transmitting the torque generated by the hydraulic motor 29 to the wheels 20.
8 is configured to be switchable between a first position shown in FIG. 14 and a second position shown in FIG.

For this reason, in the vicinity of the molds 9 arranged close to each other, the shift spur gear 38 is switched to the second position, and the duty control valve 32 controls the amount of hydraulic oil so that the vehicle travels. -It is possible to improve stop accuracy when stopping is repeated and to shorten the stop time.

Accordingly, the molten metal does not spill out of the receiving port 10 of the mold 9 and the molten metal can be poured into the mold 9 reliably, and the stop time is shortened, so that the working efficiency is improved.

Further, the smelting furnace 5, which has few chances to stop,
When traveling near 6, 7, and 8, the power transmission unit 2
Since the shift spur gear 38 of FIG. 8 can be switched to the first position to run at a relatively high speed, the work efficiency is further improved.

Further, when switching the shift spur gear 38 of the power transmission unit 28, the wheels 20 are lifted off the rails 3 and 3 by the lift means 70, so that the spur gears 38 and 44 can be prevented from being damaged.

[0078]

According to the first aspect of the present invention, since the power transmission unit is constituted by using spur gears, the mechanical strength of the power transmission unit can be reduced while minimizing the weight increase of the power transmission unit. As a result, the reliability of the cart can be improved.

According to the second aspect of the present invention, the shift means drives the shift spur gear of the power transmission unit in a state where the bogie main body is pushed up by the lift means of the transport equipment and the wheels are freely rotated. It is moved along the axis of the shaft and meshes with one of the first and second transmission spur gears. Therefore, the transport speed and traveling direction of the bogie main body can be controlled, and the gears of the power transmission unit are not damaged.

When a duty control valve for adjusting the amount of hydraulic oil supplied to the hydraulic motor is provided between the hydraulic unit and the hydraulic motor, and a control means for controlling the opening of the duty control valve is provided. Travels within a relatively narrow range
When the stop is repeated, the stop accuracy is improved and the time required for the stop can be shortened. Therefore, it is possible to improve productivity.

By moving the shift spur gear as described above, it is possible to travel at a high speed in a relatively wide range of stop intervals and to run at a low speed in a relatively narrow range of stop intervals. . Therefore, it is possible to further improve the productivity.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a power transmission unit of a self-propelled transport vehicle according to an embodiment of the present invention.

FIG. 2 is a sectional view showing the power transmission unit along the line ii-ii shown in FIG. 1;

FIG. 3 is a front view showing the proximity sensor group of the embodiment shown in FIG. 1;

FIG. 4 is a sectional view showing a rail taken along the line iv-iv shown in FIG. 16;

FIG. 5 is a sectional view showing a rail along the line vv shown in FIG. 16;

FIG. 6 is a sectional view showing the rail along the line vi-vi shown in FIG. 16;

FIG. 7 is a sectional view showing a rail taken along the line vii-vii shown in FIG. 16;

FIG. 8 is a sectional view showing a rail taken along the line viii-viii shown in FIG. 16;

FIG. 9 is a sectional view showing the rail along the line ix-ix shown in FIG. 16;

FIG. 10 is a sectional view showing the rail along the line xx shown in FIG. 16;

FIG. 11 is a sectional view showing the rail along the line xi-xi shown in FIG. 16;

FIG. 12 is a sectional view showing a rail taken along the line xii-xii shown in FIG. 16;

FIG. 13 is a sectional view showing a state of the power transmission unit of the embodiment shown in FIG. 1 in a low speed mode.

FIG. 14 is a sectional view showing a state of the high-speed mode of the power transmission unit of the embodiment shown in FIG. 1;

FIG. 15 is a perspective view showing a self-propelled transport vehicle.

FIG. 16 is a plan view showing a transport facility.

FIG. 17 is a cross-sectional view showing a power transmission unit of a conventional self-propelled transport vehicle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Transfer equipment 2 ... Floor 3 ... Rail 4 ... Self-moving conveyance trolley 14 ... First turntable 15 ... Second turntable 20 ... Wheel 21 ... Bogie main body 25 ... Axle 28 ... Power transmission unit 29 ... Hydraulic motor 33 ... output shaft 35 ... drive shaft 38 ... shift spur gear 39 ... holding member (shift drive means) 40 ... hydraulic cylinder (shift drive means) 44 ... first gear shift spur gear 46 ... second gear shift spur gear 49 ... Low-speed gear 50 ... High-speed gear 51 ... Driving side gear 70 ... Lift means

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yuichi Hazaki 4-21-1, Shimomaruko, Ota-ku, Tokyo Mitsubishi Automotive Engineering Corporation

Claims (2)

[Claims] A motor provided on a truck body running on a pair of rails laid on a floor for driving an axle of the truck body, and a power transmission unit connected to an output shaft of the motor. The power transmission unit is provided with a first drive shaft in an axial direction of a drive shaft interlocked with an output shaft of the motor.
A shift spur gear movably provided between the first position and the second position; a first speed change spur gear meshing with the shift spur gear at the first position; A second transmission spur gear meshing with the second position; a high-speed gear transmitting the rotation of the first transmission spur gear to the axle; and a rotation of the second transmission spur gear to the axle. A driven-side gear portion having a low-speed gear to be transmitted; and one of the first and second shift spur gears by moving the shift spur gear. A self-propelled transport vehicle, comprising: shift drive means for meshing with the vehicle, wherein the transport speed of the vehicle body is switched. 2. A self-propelled transport vehicle having a rail laid on a floor, a motor driving an axle supporting wheels for traveling on the rail, and a self-propelled transport vehicle provided at a location where the rail track crosses. A turntable for changing the direction of the self-propelled carrier while the self-propelled carrier is lifted off the rail by a lift means. The self-propelled carrier has an output shaft of the motor. A power transmission unit connected to the motor, wherein the power transmission unit is configured to move in a first direction in an axial direction of a drive shaft interlocked with an output shaft of the motor.
A shift spur gear movably provided between the first position and the second position; a first speed change spur gear meshing with the shift spur gear at the first position; A second transmission spur gear meshing with the second position; a high-speed gear transmitting the rotation of the first transmission spur gear to the axle; and a rotation of the second transmission spur gear to the axle. A driven-side gear portion having a low-speed gear to be transmitted; and one of the first and second shift spur gears by moving the shift spur gear to shift the shift spur gear. A shift drive unit that meshes with the shift spur gear by driving the shift drive unit in a state where the self-propelled carrier is lifted up by the lift unit and the wheels are freely rotated. First position or above And to switch to the second position, conveying equipment, characterized in that to be able to vary the conveying speed and the conveying direction of the self-propelled conveying carriage.