JPH0575298U - Automatic stop device for hydraulic actuator - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] When stopping the operation of a hydraulically operated device such as swinging and hoisting a boom, stop accurately at the target stop position without being affected by the temperature of the hydraulic oil. Provide an automatic stop device capable of [Constitution] When the hydraulic operating devices 12 (swivel base) and 13 (boom) are located at an early stop control position P set on the front side of the target stop position N, the automatic stopping device is provided with respect to the hydraulic operating devices. The hydraulic control valve that supplies hydraulic oil is closed to prevent the hydraulic actuator from stopping at a position beyond the target stop position. In addition, the automatic stop device
An oil temperature detecting means for detecting the temperature of the hydraulic oil, and a stop control position setting means for setting the early stop control position P away from the target stop position N toward the front side as the temperature detected by the oil temperature detecting means is higher. It is equipped with.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hydraulic actuating device such as a boom that can be swung and raised and lowered, and further relates to an automatic stop device used when the hydraulic actuating device is stored.

[0002]

[Prior Art]

 In a boom work vehicle equipped with a boom as described above, a boom receiver is provided at the center of the width direction of the vehicle body or the like for receiving and supporting the boom that has fallen substantially horizontally. After carrying out work using the boom, the boom is stored on this boom receiver to hold it so that it will not sway due to vibrations of the work vehicle while it is running. By the way, when the boom is stored on the boom receiver, the swing control of the boom is stopped by closing the hydraulic control valve that controls the supply of hydraulic oil to the boom. It is necessary to stop accurately at the target stop position), but after the hydraulic control valve is closed, the boom continues to flow to some extent due to the continued supply of hydraulic oil due to inertia, causing the boom to rotate. For this reason, it is not easy for the operator to perform the closing operation of the hydraulic control valve at a proper timing by anticipating the flow of such a boom by himself / herself.

Therefore, an early stop control position is set ahead of the target stop position in anticipation of such a boom flow distance, and when the boom is located at the early stop control position, the operator's An automatic stop device is often provided to forcefully close the hydraulic control valve regardless of the operation. With this automatic stop device, it is possible to avoid a situation where the boom stops beyond the target stop position, and the boom can be stopped accurately on the boom receiver.

[0004]

[Problems to be solved by the device]

 However, when the temperature of the hydraulic oil is different, the viscosity of the hydraulic oil is also different, which affects the flow distance of the boom. Specifically, the higher the hydraulic oil temperature, the longer the boom flow distance tends to be. Therefore, for example, if the hydraulic control valve is closed at the early stop control position set for a low temperature when the temperature of the hydraulic oil is high, the boom will move above the boom support. This causes the flow to operate, which causes a problem that it cannot be stopped accurately.

The present invention has been made in view of the above problems, and is designed to accurately stop a hydraulic operating device at a target stop position without being affected by the temperature of hydraulic oil. It is an object to provide an automatic stopping device for an operating device.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the automatic stop device of the present invention has an oil temperature detecting means for detecting the temperature of hydraulic oil, and the higher the temperature detected by this oil temperature detecting means, the earlier the stop control position is set from the target stop position. And a stop control position setting means for setting the distance to the near side.

[0007]

[Action]

 In such an automatic stop device, the hydraulic control valve is closed at the early stop control position set before the target stop position according to the temperature of the hydraulic oil. Then, the distance between the target stop position and the set early stop control position matches the flow working distance of the hydraulic operating device, which is estimated in advance with respect to the temperature of the hydraulic oil at that time. For this reason, the hydraulic actuator accurately stops at the target stop position regardless of the temperature of the hydraulic oil.

[0008]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. First, FIG. 1 shows an aerial work vehicle 10 equipped with an automatic stop device according to the present invention. A swivel base 12 capable of horizontally swiveling with respect to the car body 11 is attached to the rear part of the car body 11 of the aerial work vehicle 10, and the swivel base 12 has a telescope-like telescopic operation on the upper part thereof. A freely configured boom 13 is pivotally mounted so that it can be raised and lowered. The turning operation of the turntable 12 is performed by the operation of the hydraulic turning motor 14 built in the vehicle body 11. Further, the hoisting and extending / contracting operations of the boom 13 are performed by operating a hydraulic hoisting cylinder 15 mounted between the swivel base 12 and the boom 13 and a hydraulic telescopic cylinder 16 contained in the boom 13. Further, a workbench 17 is horizontally attached to the tip of the boom 13, and an operator can board the workbench 17.

The hydraulic oil supplied to each of the hydraulic actuators 14 to 16 is discharged from a hydraulic pump 21 mounted on the front part of the vehicle body 11. The hydraulic oil discharged from the hydraulic pump 21 is supplied to the hydraulic actuators 14 to 16 while controlling the flow direction and flow rate by the valve unit 22 attached to the side surface of the swivel base 12. The opening / closing operation control of each hydraulic control valve in the valve unit 22 (the one corresponding to the hydraulic swing motor 14 is referred to as a swing hydraulic control valve 22a) is normally attached to the workbench 17. The operation unit 25 is operated. For example, as shown in FIG. 2, an operation signal (electrical signal) from the operation unit 25 is input to the solenoid of the turning hydraulic control valve 22a via the turning operation signal line L to open the turning hydraulic control valve 22a. By operating, the hydraulic oil discharged from the hydraulic pump 21 is supplied to the hydraulic swing motor 14. For this reason, an operator on the work table 17 can operate the operation unit 25 to operate the swivel base 12 and the boom 13 to move to an arbitrary height.

After performing work with the work platform 10 having the above-described structure, the boom 13 is laid down substantially horizontally, and the swivel base 12 is swung so that the boom 13 extends in front of the vehicle body 11. Then, the boom 13 is received and stored on the boom receiver 18 provided at the front part of the vehicle body 11. However, such operation control of the retracting operation of the boom 13 and the swivel base 12 is difficult for a worker who is on the work table 17 because the boom receiver 18 enters a blind spot due to the presence of the work table 17 and the boom 13. . Therefore, the aerial work vehicle 10 is provided with the automatic stop device.

Next, the automatic stop device will be described with reference to FIG. The automatic stop device 30 includes a turning position detector 31, an oil temperature detector 32, a valve closing position setting device (stop control position setting means) 33, a valve closing controller 34, and an operation signal breaker 35. It is being touched. The turning position detector 31 detects a turning operation position of the turning base 12 (boom 13) with respect to the vehicle body 11. The oil temperature detector 32 detects the temperature of the hydraulic oil. The valve closing position setter 33 sets the swivel operating position of the swivel base 12 that closes the swivel hydraulic control valve 22a, that is, the early stop control position, according to the oil temperature detected by the oil temperature detector 32. . Specifically, as shown in FIG. 3, as the detected oil temperature is higher, the valve closed position (P40, P50, P40, P50, P60, ..., Pt: t indicates the oil temperature). The valve closing controller 34 compares the early stop control position set by the valve closing position setter 33 with the actual turning position of the swivel base 12 detected by the turning position detector 31, and the actual turning position is early stop control. A valve closing signal is output when the position matches. The operation signal breaker 35 is mounted on the above-described turning operation signal line L, and cuts off the turning operation signal line L when receiving the valve closing signal output from the valve closing controller 34.

When the boom 13 is stored on the boom receiver 18 using the thus configured automatic stop device 30, first, the swivel base 12 is moved toward the target stop position N by operating the operation unit 25. Activate the swing. Here, for example, when the temperature of the hydraulic oil is low (at 40 ° C.), an early stop control position (P40) that is relatively close to the target stop position N is set, and the actual turning position of the swivel base 12 is set to that value. When the early stop control position (P40) is reached, the operation signal breaker 35 cuts off the turning operation signal line L, and the turning hydraulic control valve 22a is closed. After that, hydraulic oil is supplied to the hydraulic swing motor 14 for some time, and the swivel base 12 flows and swivels, but the early stop control position (P40) is set in consideration of the flow swirling distance. Therefore, the boom 13 can be accurately stopped immediately above the boom receiver 18. Then, by operating the operation unit 25, the boom 13 can be laid down and stored so as to be placed on the boom receiver 18.

On the other hand, when the temperature of the hydraulic oil is high (50, 60 ° C.), the target stop position N is further moved to a position further away from the target stop position N than the early stop control position (P40) when the temperature is low. The stop control positions (P50, P60) are set, and the turning hydraulic control valve 22a is closed when the actual turning position of the swivel base 12 reaches each of the early stop control positions. Even after this, the hydraulic oil is supplied to the hydraulic swing motor 14 to some extent, and the amount of supply is larger because the viscosity of the hydraulic oil is lower than when the temperature of the hydraulic oil is low. By closing the turning hydraulic control valve 22a at each of the set early stop control positions, the boom 13 can be stopped exactly above the boom receiver 18 and can be stored.

Although the automatic stop device used for facilitating the storage of the boom has been described in the above embodiment, the automatic stop device of the present invention is not limited to this, and a boom or other hydraulic actuation device is not limited thereto. It can be widely used to control the operating position of the device.

[0015]

[Effect of the device]

 As described above, by using the automatic stop device of the present invention, the hydraulic operating device can be accurately stopped at the target stop position without being affected by the temperature of the hydraulic oil. Therefore, it is possible to reduce the burden on the operator who operates and controls the hydraulic operating device, and it is possible to improve the efficiency of work using the hydraulic operating device.

[Brief description of drawings]

FIG. 1 is a perspective view of an aerial work vehicle equipped with an automatic stop device according to the present invention.

FIG. 2 is a block diagram showing a configuration of the automatic stop device.

FIG. 3 is a conceptual diagram showing a valve closing position set by the automatic stop device.

[Explanation of symbols]

 12 swivel base 13 boom 14 hydraulic swing motor 22a swing hydraulic control valve 25 operation unit 30 automatic stop device 33 valve closing position setter (stop control position setting means) 35 operation signal breaker P early stop control position

Claims (1)

[Scope of utility model registration request] 1. A hydraulic operating device, which operates by receiving hydraulic oil supplied through the hydraulic control valve, closes the hydraulic control valve when it is located at an early stop control position set on the front side of a target stop position. As a result, the hydraulic operating device is an automatic stop device for the hydraulic operating device that prevents the hydraulic operating device from stopping at a position exceeding the target stop position, and an oil temperature detecting means for detecting the temperature of the hydraulic oil. And a hydraulic pressure actuating means comprising: stop control position setting means for setting the early stop control position further away from the target stop position toward the front side as the temperature detected by the oil temperature detection means is higher. Automatic stop device.