Small tonnage crane slewing damping device

Abstract

The utility model relates to a kind of small tonnage crane rotary buffering device, including main valve and hydraulic motor, main valve is used to control the oil inlet and oil return of hydraulic motor, realize the left turn and right turn of hydraulic motor, and hydraulic motor is controlled to realize rotary action by main valve;The device increases throttle between the first working oil port and the second working oil port of hydraulic motor, and the first working oil port and the second working oil port can be communicated through throttle, and when rotating, the first working oil port and the second working oil port of hydraulic motor one oil inlet one oil return, when oil inlet is not enough, oil return cavity can be supplemented to the oil inlet cavity of hydraulic motor through throttle, and hydraulic motor suction empty condition will not appear, to ensure the stability of rotation. Back pressure valve is increased on oil return main oil circuit simultaneously, and back pressure valve can improve the oil return back pressure of oil return, so that the pressure is stable when rotating, improve the stability of rotation, and back pressure valve can play the role of buffer to rotation system when rotating emergency stop, reduce the impact and shaking of emergency stop.

Description

Technical Field

[0001] This utility model relates to the field of crane technology, and in particular to a slewing buffer device for a small-tonnage crane. Background Technology

[0002] With continuous social development, crane technology is constantly being innovated. The slewing stability of a crane plays an absolutely crucial role in its overall performance. To ensure smooth operation and stable stopping of the crane's slewing motion, various manufacturers have developed their own unique slewing methods. Common slewing solutions include:

[0003] (1) By rotating, the slewing brake is released first, and then the slewing action begins. The internal shuttle valve, overflow valve and other components can realize functions such as slewing oil replenishment, overload protection and buffering. For large-tonnage cranes, this slewing buffering method is a relatively mature solution. However, for small-tonnage cranes, especially the control lever of the mechanical tie rod, there is no separate control oil circuit to control the slewing buffer valve. Therefore, it is necessary to install an additional buffering device on the slewing mechanism.

[0004] (2) Small-tonnage cranes should forgo buffer devices, as detailed below: Figure 1 As shown, this is a common slewing mechanism for small-tonnage cranes. The slewing mechanism is typically supplied with oil through a separate oil port. The oil enters through port P and is supplied to the main valve (100). By controlling the main valve (100), the hydraulic motor (200) is controlled to either enter oil through port A and return oil through port B, or return oil through port A and enter oil through port B, thus enabling the hydraulic motor (200) to turn left or right.

[0005] Patent application number CN201310545406.3 relates to a slewing buffer valve, a slewing buffer control device, and a crane slewing hydraulic system. The system includes a valve body with an inlet, a return port, a first port, and a second port. The first and second ports are respectively connected to the two ports on either side of a slewing motor. A proportional valve and a shuttle valve are installed within the valve body, wherein the first and second ports are respectively connected to the two inlets of the proportional valve. The shuttle valve is bypassed by the proportional valve. The outlet of the shuttle valve is connected to the control port of the proportional valve. The opening degree of the proportional valve is adjusted by an on-board controller based on acquired slewing information. This invention enhances the load adaptability of the slewing mechanism, improves its stability, efficiency, and operational comfort.

[0006] However, the slewing buffer control device in the aforementioned patented technology is designed for large-tonnage cranes and is not suitable for small-tonnage cranes, especially for mechanical levers. It cannot solve the problems existing in the prior art, nor does it provide any insights into solving these problems. Utility Model Content

[0007] The purpose of this utility model is to provide a slewing buffer device for small-tonnage cranes to solve the problems mentioned in the background art above:

[0008] (1) How to solve the stability problem of small-tonnage cranes during the slewing process and improve the smoothness and safety of the slewing action.

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] A slewing buffer device for a small-tonnage crane includes a main valve and a hydraulic motor. The main valve is used to control the oil inlet and outlet of the hydraulic motor to realize the left and right rotation of the hydraulic motor. The hydraulic motor realizes the slewing action through the control of the main valve.

[0011] The slewing buffer device of this small tonnage crane also includes a throttle orifice, which is located between the first working oil port and the second working oil port of the hydraulic motor.

[0012] During rotation, when the hydraulic motor has insufficient oil supply, the return oil chamber can replenish the oil supply chamber of the hydraulic motor through the throttle port.

[0013] Based on the above technical solution, the present invention can be further improved as follows.

[0014] Furthermore, it also includes a back pressure valve, which is installed on the main return oil line and can increase the return oil back pressure in the return oil chamber.

[0015] Furthermore, overflow valves are respectively installed between the first and second working oil ports of the hydraulic motor and the main return oil circuit.

[0016] Furthermore, a one-way damping valve is installed on the pipeline between the brake of the hydraulic motor and the main oil inlet circuit.

[0017] This slewing buffer device for small-tonnage cranes is suitable for small-tonnage cranes. A throttle port is added between the first and second working oil ports of the hydraulic motor. The first and second working oil ports can be interconnected through the throttle port. During slewing, the first and second working oil ports of the hydraulic motor have oil inlet and outlet respectively. When the oil inlet is insufficient, the outlet can replenish the oil inlet of the hydraulic motor through the throttle port, preventing the hydraulic motor from sucking in air and thus ensuring stable slewing.

[0018] At the same time, a back pressure valve is added to the main return oil line. The back pressure valve can increase the back pressure of the return oil chamber, so that the pressure is stable during rotation and the stability of rotation is improved. In addition, the back pressure valve can buffer the rotation system during emergency stop of rotation, reducing the impact and vibration of emergency stop.

[0019] Compared with existing technologies, this small-tonnage crane slewing buffer device has the following advantages:

[0020] (1) Through simple structural improvements, no additional rotary buffer valve is required, which reduces manufacturing costs.

[0021] (2) The setting of the throttle port and back pressure valve effectively improves the stability of the rotation process and reduces the impact and vibration during emergency stop.

[0022] (3) It is particularly suitable for small-tonnage cranes, especially cranes using mechanical lever control, and has a wide range of application prospects. Attached Figure Description

[0023] Figure 1 This is a hydraulic schematic diagram of the slewing mechanism of a crane in the prior art.

[0024] Figure 2 This is a hydraulic schematic diagram of an embodiment of the slewing buffer device for a small-tonnage crane.

[0025] Explanation of the labels in the diagram:

[0026] Main valve - 100; Hydraulic motor - 200; Brake - 210; Throttle orifice - 300; Back pressure valve - 400; Relief valve - 500; One-way damping valve - 600. Detailed Implementation

[0027] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0028] The terms “vertical,” “horizontal,” “left,” “right,” and similar expressions used in this document are for illustrative purposes only and do not represent the only possible implementation.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] Please see Figure 2 As shown.

[0031] The slewing buffer device of this small-tonnage crane includes a main valve 100, a hydraulic motor 200, a throttle port 300, and a back pressure valve 400.

[0032] The main valve 100 is used to control the oil inlet and outlet of the hydraulic motor 200, so as to realize the left and right rotation of the hydraulic motor 200. The hydraulic motor 200 realizes the rotation action through the control of the main valve 100.

[0033] The slewing buffer device of this small tonnage crane also includes a throttle port 300 disposed between the first working oil port (port A) and the second working oil port (port B) of the hydraulic motor 200, allowing oil exchange between the first working oil port and the second working oil port (port A and port B);

[0034] During the rotation process, the first working oil port and the second working oil port of the hydraulic motor 200 are responsible for oil inlet and oil return, respectively. When the oil inlet of the hydraulic motor 200 is insufficient, the oil return chamber can replenish the oil inlet chamber of the hydraulic motor 200 through the throttle port 300 to prevent the hydraulic motor 200 from sucking in air, thereby ensuring the stability of the rotation.

[0035] The back pressure valve 400 is installed on the main return oil line to increase the back pressure of the return oil chamber. The back pressure valve 400 can increase the return oil back pressure of the return oil chamber, making the pressure more stable during rotation. At the same time, in the event of an emergency stop during rotation, the back pressure valve 400 can buffer the rotation system and reduce the impact and vibration during the emergency stop.

[0036] An overflow valve 500 is provided between the first working port (port A) and the second working port (port B) of the hydraulic motor 200 and the main return oil circuit. A one-way damping valve 600 is provided on the pipeline between the brake 210 of the hydraulic motor 200 and the main inlet oil circuit.

[0037] The above description is only one embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the principle of the present utility model, and these should also be considered to fall within the protection scope of the present utility model.

Claims

1. A slewing buffer device for a small-tonnage crane, comprising a main valve (100) and a hydraulic motor (200), wherein the main valve (100) controls the oil inlet and outlet of the hydraulic motor (200) to realize the left and right rotation of the hydraulic motor (200), and the hydraulic motor (200) realizes the slewing action through the control of the main valve (100), characterized in that: The slewing buffer device of this small tonnage crane also includes a throttle port (300), which is located between the first working oil port and the second working oil port of the hydraulic motor (200); During rotation, when the hydraulic motor (200) is not receiving enough oil, the return oil chamber can replenish the oil inlet chamber of the hydraulic motor (200) through the throttle port (300).

2. The slewing buffer device for small-tonnage cranes according to claim 1, characterized in that: It also includes a back pressure valve (400), which is installed on the main oil return line and can increase the back pressure of the oil return chamber.

3. The slewing buffer device for small-tonnage cranes according to claim 1, characterized in that: An overflow valve (500) is provided between the first working oil port and the second working oil port of the hydraulic motor (200) and the main return oil circuit.

4. The slewing buffer device for small-tonnage cranes according to claim 1, characterized in that: A one-way damping valve (600) is provided on the pipeline between the brake (210) of the hydraulic motor (200) and the main oil inlet.

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