JPH04112892U - Automatic storage device for rotating work vehicles - Google Patents

Abstract

(57) [Summary] [Purpose] To quickly and accurately automatically swivel a working device on a swivel platform to a storage position and stop it. [Structure] When the automatic storage switch 22 is activated when storing the work equipment at the time of completion of work, etc., the rotation control of the swivel base 2 is performed at a normal rotation speed so as to bring the work platform 4 closer to the storage position. Due to this rotation, the working device 4 approaches the retracted position, and the deceleration area detection switch 45
1, the driving speed of the swivel base 4 by the swivel base driving means 11 is reduced, and after this, the swivel base 4 rotates at a slow speed, and then the working device 4 is located in the retracted position. When the stop position detection switch 47 comes into contact with the narrow cam portion 42, the drive of the swivel base driving means 11 is stopped.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention is designed to be mounted on a vehicle body such as an aerial work vehicle so that it can be rotated. For more details regarding the swing work vehicle with the work equipment installed on the swing table, please refer to the switch. The swivel base is rotated to the specified stowage position in response to the hand operation, and the work equipment is placed in the specified stowage position. The present invention relates to an automatic retraction control device for a swing work vehicle that can be retracted.

0002

[Conventional technology]

As shown in Fig. 2, the aerial work vehicle has a swivel platform 2 mounted on the vehicle body 1 so as to be able to rotate freely. , a telescopic boom 3 (working device) is attached to this swivel base 2 so that it can be raised and lowered freely, and It is constructed by attaching a workbench 4 to the tip of 3. During work, raise and lower the telescopic boom 3. control and telescoping control, as well as a rotation motor so that it faces the desired direction. The rotation of the swivel base 2 is controlled by the motor 11. A worker is on the workbench 4, and the worker uses the operating lever and switch 2 on the workbench 4. 1 to perform each of the above controls, and move the work platform 4 to a predetermined position with the worker on board. Move to working position. After this, the worker must perform work at height in this working position. is now possible.

0003 After completing such high-place work, the telescopic boom 3 is stored in a predetermined storage position. this Therefore, first, the telescopic boom 3 is fully retracted and it is lowered to a certain extent. Next The telescopic boom 3 is installed on the vehicle body 1 by driving the swing motor 11. Rotate the swivel base 2 until it is located directly above the boom 5, and then lower the telescopic boom 3. This is stored and held by placing it on the boom rest 5. In order to store the telescopic boom 3 in this way, the operator must rotate the swivel base 2, that is, in the swivel mode. The motor 11 is driven by manual operation of the operating lever 21. In this state, the boom rest 5 is obstructed by the telescopic boom 3, making it difficult to see. For this reason, it is a heavy burden on the worker, so a device that automatically performs this storage is required. In other words, automatic storage devices are often used.

0004 Conventionally, in a device that automatically performs such retraction, the telescopic boom 3 is Rotate the swivel base 2 to the swivel position directly above the armrest 5, that is, to the retracted position. When the rotation base 2 has been rotated to the retracted position, the drive of the rotation motor 11 is stopped and the rotation base 2 is rotated. It was configured to stop at the retracted position.

[0005]

[Problem that the idea aims to solve]

However, when the swivel base 2 reaches the retracted position, the drive of the swivel motor 11 is stopped. If it stops, the inertia of the swivel base 2 and the telescopic boom 3 and the inertia rotation of the swivel motor 11 Due to such reasons, the swivel base 3 may pass through the storage position and stop at a position where it has rotated to a certain extent. many. For this reason, the telescopic boom 3 stops slightly shifted from directly above the boom rest 5, and If the telescopic boom 3 is laid down as it is, it will not be able to be placed correctly on the boom rest 5. There is a problem.

[0006] Note that the conventional automatic storage device detects that the telescopic boom 3 is located at the storage position. Since the rotation of the swivel base 2 is stopped by the inertia force as described above, When it stops after passing the retracted position, the swivel base 2 is rotated in the opposite direction to compensate for this excess movement. The control is to Therefore, the swivel base 2 moves back and forth two or three times near the storage position. The control will then stop at the retracted position, causing discomfort to the worker on work platform 4. There are issues such as how to give a feeling. Note that this shift in the stop position and the reciprocating movement near the storage position are caused by the rotation speed of the swivel base 2. This can be prevented by slowing down the turning speed, but by slowing down the turning speed of the turning table. The problem is that the turning time to reach the storage position becomes longer and work efficiency decreases. Ru.

[0007] In view of these problems, the present invention is designed to accurately and quickly store working equipment on a swivel platform. Provides an automatic retraction control device that can rotate to a certain position and automatically retract it. The purpose is to

[0008]

[Means to solve the problem]

In order to achieve this purpose, the automatic retracting device of the present invention performs an automatic retracting operation. It also has an automatic retract switch on one side of the vehicle body and the swivel base for changing the direction of rotation. The wide cam part with the increased width and the narrow cam part with the reduced width are positioned above and below. A chevron-shaped cam is attached to the vehicle body and the other side of the swivel base to accommodate the rotation of the swivel base. The deceleration area detection switch, which comes into contact with the wide cam part, and the stop area detection switch, which comes into contact with the narrow cam part, A stop position detection switch is installed. When installing these, make sure that the work equipment The stop position is detected when the swivel base is in the storage position stored and held by the storage and holding means. The output switch contacts the narrow cam part and rotates within the specified rotation angle range around the retracted position. so that the deceleration area detection switch comes into contact with the wide cam part when the swivel base is in position. A chevron-shaped cam and both detection switches are arranged for positioning.

[0009]

[Effect]

If you use the automatic storage device with the above configuration, you can store the work equipment when the work is completed, etc. When the automatic retract switch is activated, the first step is to move the workbench closer to the retract position. The rotation control of the swivel table is performed at a normal rotation speed. This rotation retracts the working equipment. When the deceleration area detection switch comes into contact with the wide cam part, the swivel base drive hand The drive speed of the swivel base is reduced by the stage, and after this the swivel base moves at a slow speed. rotate. Next, the work equipment is in the retracted position and the stop position detection switch is set to the width position. When it comes into contact with the narrow cam portion, the driving of the swivel base driving means is stopped. For this reason, work clothes The device is stopped accurately at the retracted position without overshooting the retracted position. in this case, The work equipment rotates at normal speed until the deceleration area detection switch comes into contact with the wide cam part. The automatic retraction operation is quick as it is rotated.

0010

【Example】

Hereinafter, preferred embodiments of the present invention will be described based on the drawings. An example of an aerial work vehicle equipped with an automatic storage device according to the present invention is shown in FIG. child The aerial work vehicle is rotatably mounted on the vehicle body 1 located behind the operating cabin 1a. It is pivoted to the attached swivel base 2 and the swivel base 2 so that it can be raised and lowered, and is placed inside the base boom 3a. The telescopic boom 3 into which the tip boom 3b is telescopically inserted, and the tip of the telescopic boom 3 It has a workbench 4 which is swingably attached via a swing mechanism 15 to the worktable 4.

[0011] A swing hydraulic motor 11 is disposed on the swing base 2. 11, the swivel base 2 and the telescopic boom attached thereto are 3 can be rotated on the vehicle body 1. The telescopic boom 3 extends the luffing cylinder 12. The retracting action causes the boom to rise and fall around its base end, and furthermore, inside the telescopic boom 3. The tip boom is moved relative to the base boom 3a by the telescopic operation of the disposed telescopic cylinder 13. 3b is expanded or contracted. A swinging hydraulic motor 16 is disposed within the swinging mechanism 15. The swinging hydraulic motor 16 is driven to move the work platform 4 to the telescopic boom 3. can be swiveled horizontally.

0012 For this reason, the swing hydraulic motor 11, the luffing cylinder 12, and the telescopic cylinder 13 The rotation, lifting and telescoping operations of the telescopic boom 3 are controlled by controlling the operation of the can be done. In addition, by controlling the operation of the swinging hydraulic motor 16, the The swing movement of the work platform 4 relative to the retractable boom 3 can be controlled. Such a system The workbench 4 is equipped with operating levers and switches 21 for controlling the work. A worker on board 4 operates these operating levers and switches 21 to control the above. , and moved the work platform 4 to the desired high-place work position to perform high-place work. ing.

[0013] A leveling device (not shown) is provided between the work platform 4 and the telescopic boom 3. This leveling device ensures that the workbench 4 is always kept safe during movement and work. held horizontally. In addition, jacks 8 are arranged at four locations on the front, rear, left and right of the vehicle body 1. When carrying out work, these jacks 8 are extended to stably support the vehicle body 1. It has become.

[0014] When the telescopic boom 3 is not in operation, it is indicated by a two-dot chain line 3'' in Fig. 4. As shown in FIG. It is placed on the arm rest 5 and stored. In addition, at this time, the work The platform 4 is approximately perpendicular to the telescopic boom 3'', as shown by the two-dot chain line 4'' in the figure. It is stored in a state where it has been swiveled to the position where it is located above the operating cabin 1a. do. In the following, the telescopic boom 3'' shown by the two-dot chain line in FIG. and the position of the work platform 4'', i.e., the center axis of the telescopic boom 3'' is as shown by line A. The pivot position that coincides with the center of the boom rest 5 is called the retracted position.

[0015] Regarding the control device for performing each of the above-mentioned operations in the aerial work vehicle of this example, This will be explained using FIG. This device includes a swing control electromagnetic valve 3 that controls the operation of a hydraulic motor 11 for a swing base. 1, an undulation control solenoid valve 32 that controls the operation of the undulation cylinder 12, and a telescopic cylinder. A telescopic control electromagnetic valve 33 that controls the operation of the cylinder 13 and a hydraulic motor 16 for swinging. It has an oscillation control electromagnetic valve 34 that controls the operation. Each of these valves 31~ 34 is sent from the controller 20 via the control lines 31a to 34a. Relief valve 35 actuated by an actuation control signal and sent from hydraulic pump 26 Switch the supply of pressure oil whose pressure is regulated by control.

[0016] Note that the hydraulic pump 26 is driven by an engine 25 disposed on the vehicle body 1. However, the operation control (throttle opening control) of the engine 25 is It is controlled by an actuator 23. That is, the rotational speed of the engine 25 is It can be controlled by a throttle actuator 23. This throttle actuator The controller 23 is controlled according to a control signal from the controller 20.

[0017] The operation of each of the electromagnetic valves 31 to 34 is normally controlled by an operator provided on the workbench 4. This is done by the operator operating the operating levers and switches 21. Therefore, these operations The levers and switches 21 are connected to the controller 20, and the operating levers and switches 2 Based on the signal from 1, the controller 20 operates the electromagnetic valves 31 to 34. It is designed to be controlled. However, this device has an automatic retraction switch 22 located on the workbench 4. , when the worker presses this automatic retraction switch 22 to turn it on, the controller The troller 20 performs turning control regardless of signals from the operating lever and switches 21. The operation of the electromagnetic valve 31 is controlled and the telescopic boom 3 is automatically rotated to the storage position. Automatic retraction control is performed to move the retractor and stop it at the retracted position.

[0018] During such automatic retraction, control is provided to stop the telescopic boom 30 at the retracted position. In order to do this, as shown in FIG. 40 is attached, and two ribs are mounted so as to face the cylindrical part 2a of this swivel base 2. Mitt switches 45 and 47 are provided. In addition, both limit switches 45, 47 is fixedly held on the vehicle body 1. Both limit switches 45 and 47 are connected to controller 20.

[0019] The chevron-shaped cam 40 includes a wide cam portion 41 having a wide width along the circumferential direction of the cylindrical portion 2a; A narrow cam located above the wide cam portion 41 and having a narrow circumferential width. 42. On the other hand, the limit switches 45 and 47 are connected to the cylindrical portion 2a. They are arranged facing each other and arranged one above the other. The lower limit switch 45 This is used as a deceleration area detection switch, and the mountain attached to the cylindrical part 2a It faces the circumferential surface including the wide cam portion 41 of the mold cam 40. On the other hand, the upper limit The switch 47 is used as a stop position detection switch, and is mounted on the cylindrical part 2a. It faces the circumferential surface including the narrow cam portion 42 of the chevron-shaped cam 40 attached thereto.

[0020] Therefore, when the swivel base 2 is rotated, the width of the chevron-shaped cam 40 is increased in accordance with the rotation. The lower limit switch (deceleration area detection switch) 45 comes into contact with the cam part 41. is turned on, and the upper limit switch (stop position detection switch) is placed on the narrow cam portion 42. h) 47 is brought into contact with the switch and turned on. The positional relationship of both switches 45 and 47 with respect to the chevron-shaped cam 40 is shown in FIG. , when the telescopic boom 3 is in the retracted position, the stop position detection switch 47 is activated. It is arranged so as to come into contact with the narrow cam part 42. Therefore, the deceleration area detection switch 45 is a predetermined turning area B (lines b1 and b2 ), the wide cam portion 41 comes into contact with the wide cam portion 41. In addition, This predetermined turning region B is called a deceleration region.

[0021] Automatic storage control in the apparatus with the above configuration will be explained. Here, the work platform 4 and the telescopic boom 3 are positioned as shown by the solid line in Figure 4. The explanation will be based on an example where the automatic retraction switch 22 is pressed and the automatic retraction is performed in the state where the I will clarify. This automatic storage is a control that automatically rotates the telescopic boom 3 to the storage position. , during this rotation, make sure that the telescopic boom 3 and work platform 4 do not interfere with other objects (obstacles). Normally, before pressing the automatic retraction switch 22, the telescopic boom 3 is fully retracted. At the same time, the work platform 4 is almost perpendicular to the telescopic boom 3 as shown by 4'. Move the head to the desired position.

[0022] After this, when the automatic retraction switch 22 is pressed, this on signal is sent to the controller 20. The controller 20 controls the swing control solenoid valve 3 via the control line 31a. 1, the swing hydraulic motor 11 is driven. This hydraulic motor 11 The swivel base 2 is rotated by the drive of the swivel base 2, and the telescopic boom 3 on the swivel base 2 is moved toward the retracted position. (in this example, counterclockwise in FIG. 4). Due to this turning movement, when the telescopic boom 3 reaches the deceleration area (i.e. When reaching the position of line b1), the deceleration area detection switch 45 detects the width of the angle-shaped cam 40. When it comes into contact with the wide cam portion 41, this deceleration region detection switch 45 is turned on. This online message The signal is sent to the controller 20, and when the controller 20 receives this ON signal, it turns on the switch. Sends an operating signal to the throttle actuator 23 to adjust the throttle opening of the engine 25. throttle to switch the operating state of the engine 25 to a low idle state.

[0023] As a result, the driving rotation speed of the hydraulic pump 26 decreases, and the rotation hydraulic motor 11 The amount of oil supplied to the tank decreases. Therefore, the turning speed of the turning table 2 is reduced. After this , the swivel base 2 is slowly rotated at the speed reduced in this way, and the telescopic boom 3 is When the storage position is reached, the stop position detection switch 47 detects the width of the chevron-shaped cam 40. It comes into contact with the narrow cam portion 42, and this stop position detection switch 47 is turned on. This on signal is also sent to the controller 20, and the controller 20 receives this on signal. When the signal is received, an activation signal is sent to the swing control solenoid valve 31 to activate the solenoid valve 31. Close. As a result, the hydraulic pressure supply to the swing hydraulic motor 11 is cut off, and the swing base 2 The rotation drive stops.

[0024] As described above, the rotation of the swivel base 2 is controlled, and the telescopic boom 3 is rotated to the retracted position. will be moved. In this case, until the telescopic boom 3 reaches the deceleration area B, the swivel base 2 is rotated at a normal speed to perform a rapid rotational movement. Furthermore, telescopic boom 3 reaches the deceleration area, the turning speed of the turning base 2 is decelerated, and this reduced turning speed Since the telescopic boom 3 rotates to the retracted position at a can be stopped precisely at this position. After this, the telescopic boom 3 is operated to raise and lower and is placed on the boom rest 5. Once the telescopic boom 3 is fully retracted, storage of the telescopic boom 3 is completed.

[0025] In the above example, when the telescopic boom 3 is in the deceleration region, the engine 2 5 to reduce the rotation speed, but instead of this, the rotation control electromagnetic valve Even if the amount of oil supplied to the swing hydraulic motor 11 is reduced by the valve 31 to reduce the swing speed, good. In addition, in the above example, the angle-shaped cam is attached to the swivel base, and the deceleration area detection switch and The stop position detection switch and stop position detection switch are installed on the vehicle body side, but it is recommended to install them in the opposite way. You can do it as well.

[0026]

[Effect of the idea]

As explained above, according to the present invention, when the automatic retraction switch is activated, The rotation control of the swivel base that brings the work platform closer to the storage position is not possible at the normal rotation speed. This rotation causes the work equipment to approach the retracted position, and the deceleration area detection switch When it comes into contact with the wide cam part, the driving speed of the swivel base by the swivel base drive means is reduced. After that, the swivel base is controlled to rotate at a slow speed, and then the work equipment is When the stop position detection switch comes into contact with the narrow cam part when the stop position detection switch is in the retracted position, the rotation The drive of the turntable driving means is stopped. As a result, the implement will eventually reach the stowed position at a reduced swing speed and can be stopped exactly at this storage position without going too far. Ru. In this case, the work equipment will not move until the deceleration area detection switch comes into contact with the wide cam part. Since it is rotated at normal speed, the automatic retraction operation can be performed quickly.

[Brief explanation of drawings]

FIG. 1 is a control circuit diagram showing an operation control device having an automatic storage device according to the present invention.

FIG. 2 is a perspective view showing an example of an elevated work vehicle.

FIG. 3 is a perspective view showing an angle-shaped cam and two switches arranged around the swivel base of this aerial work vehicle.

FIG. 4 is a plan view of the above-mentioned aerial work vehicle.

[Explanation of symbols]

1 Vehicle body 2 Swivel base 3 Telescopic boom 4 Workbench 5 Boom rest 22 Automatic retraction switch 40 Chevron cam 41 Wide cam part 42 Narrow cam part 45 Deceleration area detection switch 47 Stop position detection switch

Claims (1)

[Scope of utility model registration request] 1. A swivel base rotatably mounted on a vehicle body, a swivel drive means for rotating the swivel base, a working device disposed on the swivel base, and a housing for storing the working device. An automatic storage device for a swing work vehicle, comprising a storage and holding means disposed on the vehicle body for holding the vehicle, the automatic storage device being attached to one of the vehicle body and the swivel base, and having a width wide in the swing direction. a chevron-shaped cam having a wide cam portion with a narrow width and a narrow cam portion with a narrow width positioned above and below; attached to the other of the vehicle body and the swivel base;
a deceleration area detection switch that comes into contact with the wide cam portion as the swivel base rotates; and a stop that is attached to the other of the vehicle body and the swivel base that abuts the narrow cam portion as the swivel base rotates. a position detection switch; and an automatic storage switch that is activated when the working device is stored, and the rotating base is located at the storage position where the working device is stored and held by the storing and holding means, and when the rotating base is located at the stop position. the detection switch contacts the narrow cam portion, and the deceleration region detection switch contacts the wide cam portion when the swivel base is located within a predetermined rotation angle range centered on the retracted position; The chevron-shaped cam and both of the detection switches are arranged for positioning, and when the automatic retraction switch is activated, the swivel base is moved so that the working device approaches a storage position where the work device is stored and held by the storage and holding means. When the deceleration area detection switch comes into contact with the wide cam portion in response to the rotation, the drive speed of the swivel base by the swivel base drive means is reduced, and the stop position detection switch 1. An automatic retracting device for a turning work vehicle, characterized in that the device is configured to stop the drive of the turning table driving means when it comes into contact with the turning table.