JPH0240078Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The invention relates to a transport vehicle used in a spinning factory to unload a beam from a spinning machine or to install a beam on a loom. .

(Prior art and its problems) Conventionally, this type of transport vehicle is as shown in Figs. 8 and 9.
Casters 15, 15 are attached to both ends of the U-shaped vehicle body 1, an axle 2 is arranged in the center of the vehicle body 1 so as to be rotatable in a horizontal plane, and wheels 21, 2 are attached to both ends of the axle 2.
1, and a switching device 7 for reversing the axle 2 by 90 degrees is connected thereto, and article support arms 6, 6a are disposed at both ends of the vehicle body 1 so as to be movable up and down (Kokoku No. 47-8682).

By switching the directions of the central wheels 21, 21, the transport vehicle can move straight in two directions: the longitudinal direction of the vehicle body 1 as indicated by arrow _A1 and the transverse direction of the vehicle body 1 as indicated by arrow _A2 .

Each of the arms 6, 6a is raised and lowered by a hydraulic cylinder (not shown), and the beam B on the arms 6, 6a is
The delivery will take place.

However, as shown in Figures 8 and 9, the axle 2 is connected to the vehicle body 1.
When facing in the transverse direction, one center wheel 2
1 is located directly below beam B, so if arms 6 and 6a are lowered in this state and the beam is lowered,
When the beam B hit the center wheel, the thread wound on the beam got dirty, and there was also the problem of the thread being cut.

(Means for Solving the Problems) The present invention is based on a long object transport vehicle previously proposed by the applicant, in which each drive cylinder of a pair of arms supporting both ends of a long object is replaced by a single hydraulic pump. By combining the technology for synchronous operation (Japanese Patent Application Laid-open No. 59-50829) and the technology for solving the above problem, both arms can be raised and lowered simultaneously using one hydraulic pump, and the center wheel is positioned directly below the load on the arm. , it reveals a carrier that does not lower the arm.

This invention connects a double-acting cylinder 3 to one arm 6 and a single-acting cylinder 4 to the other arm 6a among a pair of arms 6, 6a provided at both ends of the vehicle body 1, and connects the primary port of the double-acting cylinder 3. A hydraulic pump 33 and a hydraulic release valve 34 are connected to the pipe 31, a secondary port 32 of the cylinder is connected to the single-acting cylinder 4, and a pipe 92 is connected to the double-acting cylinder 3 and the hydraulic release valve 34. The vehicle is characterized in that a check valve 8 for opening and closing is provided, the valve is connected to a switching device 7 of the axle 2, and the check valve 8 is switched by the operation of the switching device.

(Operation and Effect) The double-acting cylinder 3 is activated by the operation of the hydraulic pump 33, and the arm 6 is raised.

The working oil discharged from the double-acting cylinder 3 by the piston 34 activates the single-acting cylinder 4 and raises the arm 6a connected to the cylinder.

That is, by simultaneously operating both cylinders with one hydraulic pump 33, the arms 6, 6a can be raised, and the beams on the arms 6, 6a can be transferred.

When the central wheel 21 is located directly below the beam B, the check valve 8 connected to the switching device 7 closes the conduit 91 connecting the double-acting cylinder 3 and the hydraulic release valve 34.

Therefore, even if the oil pressure release valve 34 is opened, the working oil in the cylinders 3 and 4 will not be discharged, and the arms 6 and 6a will not be lowered. Therefore, it is possible to reliably prevent the beam from coming down and hitting the center wheel.

(Embodiment) The vehicle body 1 of the transport vehicle is formed into an integral U-shape with leg rods 14 projecting approximately parallel to both ends of a main rod 11, and an axle shaft rotatable in a horizontal plane at the center of the main rod 11. 2, and wheels 21, 21 (hereinafter referred to as central wheels) are provided at both ends of the axle.

Casters are attached to both ends of each leg rod 14.

The main rod 11 is formed by slidably fitting a square pipe 13 into a connecting pipe 12 having a square cross section.
and the leg rod 14 are integrally connected.

A plurality of long holes 17 are opened at both ends of the connecting pipe 12, and bolts 19 inserted into the long holes 17 are screwed into the square pipe. The length of the main rod 11 can be adjusted by shifting the margin of the hole 17 and the position of the screw hole 18 into which the bolt 19 is screwed.

Arm support shafts 62, 62 are rotatably arranged on the outer end side of each square pipe 13 in parallel with the pipes, and the piston rods 30, 40 of the hydraulic cylinders 3, 4 are connected to the outer ends of the shafts via levers 64, 64. are linked.

The arm support shaft 62 has a square shaft 6 between the shaft bearings at both ends.
3, and the base ends of the arms 6, 6a are slidably fitted into the square shaft, and the distance between the arms can be adjusted by sliding the arms 6, 6a.

A receiving portion 61 for receiving the end of the beam B is formed at the tip of the arms 6, 6a.

Each of the cylinders 3 and 4 is supported on both leg rods 14 of the vehicle body 1, and one cylinder is a double-acting cylinder 3,
The other is the single-acting cylinder 4, and as shown in FIG. ₄ , the inner diameter area of the double-acting cylinder ₄ is equal to Equal to S ₃ .

As shown in FIG. 1, a manual hydraulic pump 33 for operating the cylinder 3 and a manual hydraulic pump 24 for operating a hydraulic jack 23 for raising and lowering a central wheel, which will be described later, are provided on the double-acting cylinder 3 side.

The double-acting cylinder 3 and the single-acting cylinder 4 are operated simultaneously by one hydraulic pump 33,
As shown in FIG. 4, the oil tank 96 provided in the leg rod 14 and the hydraulic pump 33 are connected through a first conduit 91, and the pump 33 and the primary port 31 of the double-acting cylinder 3 are connected through a second conduit 92. , the second port 32 of the double-acting cylinder 3 and the single-acting cylinder 4 are connected through the third pipe line 93, respectively.

The first conduit 91 is provided with a check valve 93 that allows flow only in one direction from the tank 96 to the pump 33.

A check valve 94 that allows flow only in one direction from the pump 33 to the double-acting cylinder 3 in the second pipe line 92;
A branch pipe 95 equipped with a hydraulic release valve 34 is provided downstream of the check valve, and a check valve 8 is provided further downstream of the branch pipe 95.

The tip of the branch pipe 95 is connected to the hydraulic tank 96, and the hydraulic release valve 34 on the branch pipe 95 is operated by rotating the hydraulic release knob 35 disposed near the pump 33. Open and close.

The check valve 8 is connected to a switching device 7 of the central wheel 21, which will be described later, and is a second pipe that prevents or allows backflow of hydraulic oil from the double-acting cylinder 3 to the pump side by the operation of the switching device 7. 92 is opened and closed.

An air vent terminal 5 is provided in the third conduit 93. The terminal 5 is provided at the highest position in the piping, and in the embodiment is fixed to the end of the main rod 11 on the side of the single-acting cylinder 4.

As shown in FIG. 7, the terminal 5 has a T-shaped passage 51 in the lower part of a case 50, and an oil reservoir chamber 52 in the upper part that communicates with the passage and has an opening with a lid 54 in the center of the upper surface.

Both ends of the T-shaped passage 51 are connected to a third pipe line 93, and a seal plug 53 is screwed into the communication portion between the passage 51 and the oil reservoir chamber 52, and working oil is injected into the oil reservoir chamber 52.

If air gets mixed into the piping,
Air accumulates in the T-shaped passage 51 of the terminal 5 at the highest position in the piping. Therefore, when the seal plug 53 is loosened, air becomes bubbles and is discharged from the oil reservoir chamber 52 to the outside.

The manual pump 2 is connected to the connecting pipe 12 in the center of the vehicle body 1.
Hydraulic jack 2 for lifting and lowering wheels operated by 4
3 is provided, and an axle mounting portion 22 is attached to the jack.
The axle 2 is attached via.

A switching device 7 is connected to the axle 2 to switch the axle between two directions: a longitudinal direction of the vehicle body 1 and a direction orthogonal to the longitudinal direction.

As shown in FIG. 5, the switching device 7 has a support plate 70 protruding downward from the connecting pipe 12, and a lever 71 is provided on the support plate 70 so as to be rotatable in a vertical plane. Connecting bar 74 to the free end of 71 and axle 2
Pivotally connect at.

A handle 73 is removably attached to the lever 71, and the lever 71 is connected to the second part of the axle 2.
A locking pin 76 is provided which locks in two positions corresponding to the directional switching position.

The support plate 70 has two holes 70a and 70b into which the lock pin 76 is fitted, and the lock pin is biased toward the support plate 70 by a spring 77, and when the lever 71 is rotated, the pin 76 and the hole 70a are pushed together. ,70b
If the positions correspond, the pin will automatically engage the hole and the lever 71 and axle 2 will be locked.

When the pin is pulled out from the hole against the spring, lever 7
1 rotation is allowed.

When the lock pin 76 is inserted into one of the holes 70a, the axle 2 is along the longitudinal direction of the carrier vehicle, and both central wheels 21, 21 are moved toward the main rod 11, as shown in FIG. When the pin engages in the other hole 70b, the axle 2 faces in the transverse direction of the carrier, as shown by the two-dot chain line in FIG.
It is located right below between the support parts 61 and 61 of 6a.

A check valve 8 for the second pipe line 92 is disposed on the support plate 70, and a pivot shaft 75 of the lever 71 is disposed on the support plate 70.
passes freely through the support plate 70, and a cam 78 for operating the check valve 8 is keyed at the penetrating end.

The check valve 8 is connected to the pump 33 as shown in FIG.
A valve seat 83 is formed in the passage 82 that communicates the primary port 88 on the side and the secondary port 89 on the cylinder 3 side, and the secondary port side expands into a conical shape. A pilot piston 86 biased by a spring 87 in a direction away from the valve body 84 is disposed in the passage 82, and the tip of the piston 86 is brought into contact with the cam 78.

When the valley surface 78b of the cam 78 corresponds to the piston 86, the valve body 84 is pushed against the valve seat 8 by the spring 85.
3, allowing flow only from the primary port to the secondary port. That is, the working oil is allowed to flow only from the pump 33 side to the double acting cylinder 3 side, and the working oil is prevented from flowing from the double acting cylinder 3 to the pump 33.
At this time, the axle 2 is first directed in the lateral direction of the carrier vehicle, as shown by the two-dot chain line.

The mountain surface 78a of the cam 78 connects the piston 86 with the spring 8.
7, the piston 86 presses against the valve body 84.
is separated from the valve seat 83, and backflow from the secondary port 89 to the primary port 88 is also allowed. That is, backflow of working oil from the double-acting cylinder 3 to the pump 33 side is allowed. At this time, the axle 2 is aligned in the longitudinal direction of the carrier vehicle, as shown by the solid line in FIG.

Therefore, the manual pump 3 for driving the arms 6, 6a
3, the working oil in the tank 96 flows through the check valve 8 and from the primary port 31 of the double-acting cylinder 3, causing the piston rod 30 to be pushed out and the arm 6 to be raised.

Working oil is discharged from the secondary port 32 by the protrusion of the piston rod 30, and the single acting cylinder 4
The piston rod 40 of the cylinder
to raise the arm 6a.

Therefore, both arms 6, 6a rise simultaneously.
Furthermore, since the area obtained by subtracting the cross-sectional area _S2 of the piston rod of the cylinder from the inner diameter area _S1 of the double-acting cylinder 3 is equal to the inner diameter area _S3 of the single-acting cylinder 4, the working oil discharged from the double-acting cylinder 3 The rising speed of the piston rod 40 of the single-acting cylinder 4, which is pushed up by the piston rod 30 of the double-acting cylinder 3, is
is equal to the rate of rise.

To lower the beam B, turn the hydraulic release knob 36 to release the hydraulic release valve 34.

The working oil filling the primary port 31 side of the double-acting cylinder 3 passes through the check valve 8 and is discharged from the branch pipe 95 to the tank 96. As the piston 30 of the double-acting cylinder 3 descends, the same amount of working oil as the discharged working oil is sucked from the single-acting cylinder 4 into the secondary port 32 side.

As a result, both piston rods 30, 40 descend simultaneously and at the same speed.

When the axle 2 of the central wheel 21 is along the vehicle body 1 and located directly below the beam B, the check valve 8 prevents backflow from the double-acting cylinder 3 to the pump 33 side, as described above. Even if the oil pressure release knob 36 is loosened, the working oil in the double-acting cylinder 3 will not be discharged. Therefore, the arms 6, 6a do not descend, and the beams on the arms 6, 6a hit the wheels 21, causing the threads of the beams to get dirty.
Cutting is definitely prevented.

In the embodiment, the distance between the two leg rods 14 can be changed by adjusting the length of the main rod 11 of the vehicle body 1, and the distance between the two arms 6, 6a can be changed by adjusting the length of the main rod 11 of the vehicle body 1.
Since it can be adjusted independently of the length adjustment of the beam, the distance between the arms 6 and 6a can be adjusted according to the length of the beam by pushing the carrier into the spinning machine or loom, passing through the lower part of the machine. It can be used regardless of the type of spinning machine or loom.

Further, in the embodiment, the height of both arms 6, 6a can be adjusted by the following procedure using the air bleed terminal 5 provided between the double acting cylinder 3 and the single acting cylinder 4.

Make the left and right arms 6, 6a horizontal. When the heights of both arms 6 and 6a are different, double acting cylinder 3
Make the side arm 6 horizontal.

Remove the lid 54 of the terminal 5, check that the oil reservoir chamber 52 is full of working oil, and if it is low, replenish it and loosen the seal plug 53.

Arm 6a on the single acting cylinder 4 side (hereinafter referred to as the right arm)
Arm 6 on the double acting cylinder 3 side (hereinafter referred to as the left arm)
If you want to lower it, push down the right arm 6a,
Stop at the desired position. The working oil flows from the single-acting cylinder 4 to the terminal 5 by the amount pushed down, and the working oil overflows into the terminal 5.

To make the right arm 6a higher than the left arm 6,
Lift the right arm 6a to the required height. The working oil in the oil sump at Terminal 5 is dropping. At this time, be careful not to let the oil level drop too low and allow air to flow into the piping.

After completing the above-mentioned necessary operations, all you have to do is close the seal plug 53 and lid 54.

The present invention is not limited to the above configuration, and various modifications can be made within the scope of the claims for utility model registration.

[Brief explanation of the drawing]

Figure 1 is a plan view of the carrier, Figure 2 is a front view of the carrier, Figure 3 is a side view of the carrier, Figure 4 is a piping diagram, and Figure 5 is a partial cross-section of the switching device. FIG. 6 is a sectional view along FIG. 5-, FIG. 7 is a sectional view of the air bleed terminal, FIG. 8 is a plan view of the conventional example, and FIG. 9 is a side view of the conventional example. 1...Vehicle body, 2...Axle, 21...Wheel, 3...
...Double acting cylinder, 4...Single acting cylinder, 7...Switching device, 8...Check valve.

Claims (1)

[Scope of utility model registration request] Casters 15, 15 are mounted on both ends of the U-shaped vehicle body 1.
In the center of the vehicle body 1, an axle 2 with wheels 21, 21 at both ends is arranged rotatably in a horizontal plane,
A switching device 7 for reversing the axle 2 by 90 degrees in a horizontal plane is connected to the axle 2, and a pair of article support arms 6, 6a are disposed at both ends of the vehicle body 1 so as to be movable up and down. A double-acting cylinder 3 is connected to one arm 6, a single-acting cylinder 4 is connected to the other arm 6a, and a hydraulic pump 33 and a hydraulic release valve 34 are connected to the primary port 31 on the arm raising drive side of the double-acting cylinder 3.
A check valve 8 is disposed in a conduit 92 connecting the secondary port 32 of the cylinder and the single-acting cylinder 4, and connecting the double-acting cylinder 3 and the hydraulic pressure release valve 34. A transport vehicle characterized in that it is connected to a switching device 7 of No. 2, and a check valve 8 is switched by the operation of the switching device.