Auxiliary control valve for automobile crane

Abstract

The utility model provides an auxiliary control valve for an automobile crane, which comprises a valve seat, interfaces are arranged on two sides of the valve seat, the interfaces are through cylindrical channels, internal threads are arranged on the inner walls of the interfaces, a valve core is arranged in the valve seat, a buffer device is arranged in the valve core, and the buffer device is arranged in the valve seat. The buffering device is used for buffering flowing of hydraulic oil in the control valve. The valve element comprises a ball seat, a connecting shaft and an adjusting block, the connecting shaft is fixed to the lower end of the adjusting block, the ball seat is fixed to the tail end of the connecting shaft, and the adjusting block, the connecting shaft and the ball seat are fixedly connected in a welded mode. A flow channel is arranged on the periphery of the ball seat, the ball seat is arranged in the valve seat, the buffering device is arranged in the valve element, impact and vibration in the flowing process of hydraulic oil are effectively reduced, the stability and durability of the control valve are improved, elastic adjustment can be conducted according to different working conditions through the design of a spring in the buffering device, and the service life of the valve element is prolonged. And the buffering effect is further enhanced.

Description

Technical Field

[0001] This utility model relates to the field of control valve technology, and in particular to an auxiliary control valve for a truck crane. Background Technology

[0002] A truck crane is a type of crane mounted on a regular truck chassis or a special-purpose truck chassis. Its driver's cab and crane operator's cab are set separately, and outriggers must be extended to maintain stability during operation.

[0003] Existing Chinese patent document CN202221220722.4 discloses a boom control valve for a telescopic boom crane, belonging to the field of control valves. It includes a control valve body with a positioning seat fixedly installed on its lower surface, and a mounting box is provided at the positioning seat. The boom control valve for a telescopic boom crane described in this utility model can adjust the position of the movable clamp and lock the position of the positioning seat after being tightened by a limiting block. The control valve body can be flexibly assembled and disassembled with the pre-set mounting box, simplifying the assembly and disassembly process and facilitating subsequent quick maintenance of the control valve body. Through the provided anti-detachment insert and positioning seat, before the control valve body is disassembled, the anti-detachment insert at one end of the positioning baffle is embedded in the anti-detachment hole of the positioning seat, providing a certain degree of anti-detachment effect before complete disassembly and reducing the possibility of the control valve body falling during suspended assembly and disassembly work.

[0004] However, the above-mentioned patent has certain defects in use. The control valve cannot control the flow rate, thus it cannot adjust the damping of the hydraulic oil. The feedback of the hydraulic oil is not flexible enough, which can easily cause the control valve to burst when the load is too large, thereby damaging the entire system.

[0005] To address this issue, an auxiliary control valve for truck cranes is proposed. Utility Model Content

[0006] In order to overcome the shortcomings of the prior art, this utility model provides an auxiliary control valve for a truck crane.

[0007] This utility model is achieved using the following technical solution:

[0008] An auxiliary control valve for a truck crane includes a valve seat with interfaces on both sides. Each interface is a through cylindrical channel with internal threads on its inner wall. A valve core is located inside the valve seat, and a buffer device is located inside the valve core. The buffer device is used to buffer the flow of hydraulic oil inside the control valve.

[0009] The valve core includes a ball seat, a connecting shaft, and an adjusting block. The connecting shaft is fixed to the lower end of the adjusting block, and the ball seat is fixed to the end of the connecting shaft. The adjusting block, the connecting shaft, and the ball seat are welded and fixedly connected.

[0010] The ball seat has a flow channel around its perimeter and is located inside the valve seat.

[0011] The buffer device includes a mounting plate, on both sides of which buffer plates are symmetrically arranged. Each buffer plate has multiple flow holes. Two guide posts are provided on the inner wall of the buffer plate. The guide posts penetrate the mounting plate. Each guide post has a limiting block at its end and a spring is sleeved on the guide post.

[0012] A limiting plate is provided between the adjusting block and the connecting shaft. The limiting plate is installed on the upper surface of the valve seat. A limiting bolt is provided on the upper surface of the valve seat. The limiting bolt is threadedly connected to the valve seat. The limiting bolt and the limiting plate are tightly abutted against each other.

[0013] The present invention has the following advantages over the prior art:

[0014] 1. By setting a buffer device inside the valve core, the impact and vibration during the hydraulic oil flow process are effectively reduced, improving the stability and durability of the control valve. The spring design in the buffer device can be elastically adjusted according to different working conditions, further enhancing the buffering effect.

[0015] 2. By setting a limit bolt on the valve seat, this limit structure design ensures the stability and reliability of the valve core during rotation, avoiding malfunctions caused by valve core offset rotation. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0017] Figure 2 This is a three-dimensional side view of the present invention.

[0018] Figure 3 This is a three-dimensional structural diagram of the valve core of this utility model;

[0019] In the diagram: 1. Valve seat; 11. Interface; 2. Limiting plate; 21. Adjusting block; 22. Connecting shaft; 3. Limiting bolt; 4. Ball seat; 41. Flow channel; 5. Buffer plate; 51. Flow hole; 6. Mounting plate; 7. Spring; 71. Limiting block; 72. Guide post. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] like Figures 1 to 3 As shown, an auxiliary control valve for a truck crane includes a valve seat 1. The valve seat 1 has interfaces 11 on both sides. Each interface 11 is a through cylindrical channel for connecting oil pipes in a hydraulic system and providing a flow channel 41 for hydraulic oil. The inner wall of the interface 11 has internal threads for easy fastening to oil pipes or other connecting parts. The valve seat 1 has a valve core inside, and the valve core has a buffer device inside. The buffer device is used to buffer the flow of hydraulic oil inside the control valve.

[0023] The valve core includes a ball seat 4, a connecting shaft 22, and an adjusting block 21. The connecting shaft 22 is fixed to the lower end of the adjusting block 21, and the ball seat 4 is fixed to the end of the connecting shaft 22. The adjusting block 21, the connecting shaft 22, and the ball seat 4 are welded and fixedly connected to each other to ensure the stability and strength of the structure.

[0024] The ball seat 4 has flow channels 41 around its perimeter. The ball seat 4 is located inside the valve seat 1. When the valve core rotates within the valve seat 1, the opening and closing state of the flow channels 41 changes, thereby regulating the flow direction and flow rate of the hydraulic oil. The valve core consists of the ball seat 4, a connecting shaft 22, and an adjusting block 21. The connecting shaft 22 connects the adjusting block 21 and the ball seat 4 together to form an integral structure. The adjusting block 21 is used to connect to an external operating mechanism of the valve seat 1. When the external operating mechanism is activated, it drives the ball seat 4 to rotate within the valve seat 1 via the connecting shaft 22. The flow channels 41 on the ball seat 4 are designed with a specific shape and size. When the ball seat 4 rotates to different positions, the opening and closing state of the flow channels 41 changes, thereby achieving precise control of the hydraulic oil flow direction and flow rate.

[0025] The buffer device includes a mounting plate 6, on both sides of which buffer plates 5 are symmetrically arranged. Each buffer plate 5 has multiple flow holes 51 to allow hydraulic oil to pass through. Two guide posts 72 are provided on the inner wall of each buffer plate 5, and the guide posts 72 penetrate the mounting plate 6. Each guide post 72 has a limiting block 71 at its end to prevent the buffer plate 5 from detaching from the mounting plate 6. A spring 7 is sleeved on each guide post 72. When the hydraulic oil flow generates an impact, the spring 7 can absorb part of the impact force and play a buffering role.

[0026] A limiting plate 2 is provided between the adjusting block 21 and the connecting shaft 22. The limiting plate 2 is installed on the upper surface of the valve seat 1. A limiting bolt 3 is provided on the upper surface of the valve seat 1. The limiting bolt 3 is threadedly connected to the valve seat 1, and the limiting bolt 3 abuts against the limiting plate 2. By rotating the limiting bolt 3, the precise control of the valve core rotation range can be adjusted. The abutting between the limiting bolt 3 and the limiting plate 2 ensures that the valve core will not move during operation.

[0027] The working principle of this utility model is as follows: When the truck crane is not in operation, the auxiliary control valve is in its initial state. At this time, the valve core is in a fixed position inside the valve seat 1, the spring 7 in the buffer device is in an uncompressed state, and the limiting structure ensures that the valve core will not move arbitrarily.

[0028] Open the limit bolt 3 and rotate the adjusting block 21 from the horizontal state to the vertical state. At this time, the connecting shaft 22 drives the ball seat 4 to rotate inside the valve seat 1, changing the opening and closing state of the flow channel 41. As the valve core moves, the hydraulic oil begins to flow through the opened flow channel 41. During the flow, the hydraulic oil will impact the buffer plate 5 in the buffer device.

[0029] When the buffer plate 5 is impacted by hydraulic oil, it moves the mounting plate 6 along with it. At this time, the spring 7 begins to be compressed, absorbing part of the impact force. Meanwhile, the flow holes 51 on the buffer plate 5 are designed to disperse the flow velocity of the hydraulic oil, further reducing impact and vibration.

[0030] By precisely rotating the valve core, the opening of the flow channel 41 can be controlled, thereby regulating the flow rate of hydraulic oil. This ensures that the truck crane receives the required hydraulic oil flow rate when performing different actions.

[0031] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. An auxiliary control valve for a truck crane, comprising a valve seat (1), wherein the valve seat (1) has interfaces (11) on both sides, the interfaces (11) being through cylindrical channels, and the inner wall of the interfaces (11) having internal threads, characterized in that, The valve seat (1) is provided with a valve core inside, and the valve core is provided with a buffer device inside, which is used to buffer the flow of hydraulic oil inside the control valve.

2. The auxiliary control valve for a truck crane according to claim 1, characterized in that: The valve core includes a ball seat (4), a connecting shaft (22), and an adjusting block (21). The connecting shaft (22) is fixed to the lower end of the adjusting block (21), and the ball seat (4) is fixed to the end of the connecting shaft (22). The adjusting block (21), the connecting shaft (22), and the ball seat (4) are welded and fixedly connected. The ball seat (4) is provided with a flow channel (41) around its perimeter, and the ball seat (4) is located inside the valve seat (1).

3. The auxiliary control valve for a truck crane according to claim 2, characterized in that: The buffer device includes a mounting plate (6), on which buffer plates (5) are symmetrically arranged. The buffer plates (5) are provided with multiple flow holes (51). The inner wall of the buffer plates (5) is provided with two guide posts (72). The guide posts (72) penetrate the mounting plate (6). The end of the guide posts (72) is provided with a limiting block (71). A spring (7) is sleeved on the guide posts (72).

4. An auxiliary control valve for a truck crane according to claim 2, characterized in that: A limiting plate (2) is provided between the adjusting block (21) and the connecting shaft (22). The limiting plate (2) is installed on the upper surface of the valve seat (1). A limiting bolt (3) is provided on the upper surface of the valve seat (1). The limiting bolt (3) is threadedly connected to the valve seat (1). The limiting bolt (3) and the limiting plate (2) are pressed together.

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