Load-sensitive double-pump loading valve of truck-mounted crane

Abstract

The utility model is suitable for the technical field of loading valves, and provides a load-sensitive double-pump loading valve of a truck-mounted crane, which comprises an oil inlet and return valve plate, a first reversing valve plate, a second reversing valve plate, a third reversing valve plate, a quantitative oil inlet valve plate, a fourth reversing valve plate and a tail plate, the oil inlet and return valve plate, the first reversing valve plate, the second reversing valve plate, the third reversing valve plate, the quantitative oil inlet valve plate, the fourth reversing valve plate and the tail plate are connected through bolts to form a complete valve set. The truck-mounted crane load-sensitive double-pump loading valve has the advantages of smaller size, capability of compositely operating winding, stretching, amplitude variation, rotation and the like by adopting a double-pump series system, two working conditions, three working conditions and four working conditions can be simultaneously operated, and in addition, the whole oil inlet and return is safer and more stable due to the arrangement of double pumps in the valve group.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle-mounted valves, and in particular relates to a vehicle-mounted crane load-sensitive double-pump vehicle-mounted valve. Background Art

[0002] As the name suggests, the on-board valve is a valve installed on a vehicle (such as a crane, pump truck, etc.) to control the operation of the hydraulic system. By controlling the flow direction and pressure of the oil in the hydraulic system, the action control of various working devices of the vehicle, such as the lifting, extension, and rotation of the boom, is achieved.

[0003] On-board valves are widely used in industrial machinery, engineering machinery, agricultural machinery and other fields, especially in situations where precise control of the hydraulic system is required, such as heavy machinery and equipment such as cranes, pump trucks, and excavators. However, the existing on-board valves for truck cranes cannot perform complex control of the rotation, extension, luffing and hoisting systems during use, resulting in low working efficiency. Utility Model Content

[0004] The utility model provides a load-sensitive double-pump loading valve for a truck crane, aiming to solve the problem that the existing truck crane loading valve cannot simultaneously control the rotation, extension, amplitude change and hoisting systems during use, resulting in low working efficiency.

[0005] The utility model is implemented as follows: a load-sensitive dual-pump vehicle-mounted crane valve comprises an oil inlet and return valve plate, a first reversing valve plate, a second reversing valve plate, a third reversing valve plate, a quantitative oil inlet valve plate, a fourth reversing valve plate and a tail plate, wherein the oil inlet and return valve plate, the first reversing valve plate, the second reversing valve plate, the third reversing valve plate, the quantitative oil inlet valve plate, the fourth reversing valve plate and the tail plate are all connected by bolts to form a complete valve group;

[0006] The oil inlet and return valve plate and the tail plate are located at two ends of the valve group;

[0007] The oil inlet and return valve plate is provided with a P port, an R port, an M port, an LS port and a Z port;

[0008] The first reversing valve plate, the second reversing valve plate, the third reversing valve plate and the fourth reversing valve plate are all provided with A / B ports;

[0009] The quantitative oil inlet valve plate is provided with a P1 port;

[0010] The tail plate is provided with a T-port, and the first reversing valve plate, the second reversing valve plate, the third reversing valve plate and the fourth reversing valve plate are connected in parallel via two oil passages;

[0011] The A1 and B2 oil ports on the first reversing valve plate are connected to the hoisting mechanism on the crane;

[0012] The A2 and B2 oil ports on the second reversing valve plate are connected to the telescopic oil cylinder mechanism on the crane;

[0013] The A3 and B3 oil ports on the third reversing valve plate are connected to the luffing oil cylinder mechanism on the crane;

[0014] The A4 and B4 oil ports on the fourth reversing valve plate are connected to the slewing motor mechanism on the crane.

[0015] Preferably, three-position four-way reversing valves are provided inside the first reversing valve plate, the second reversing valve plate, the third reversing valve plate and the fourth reversing valve plate.

[0016] Preferably, the spool functions inside the first reversing valve plate and the second reversing valve plate are the same and both belong to the H type.

[0017] Preferably, the spool functions inside the second reversing valve plate and the third reversing valve plate are the same and both belong to the L type.

[0018] Preferably, the structures of the three-position four-way reversing valves are the same.

[0019] Beneficial effects

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows: A load-sensitive double-pump upper vehicle valve for a truck-mounted crane of the present utility model adopts a double-pump series system, has a smaller volume, and has the advantages of being able to compound operations such as winching, telescoping, luffing, and slewing. It can operate two working conditions, three working conditions, and four working conditions simultaneously. In addition, double pumps are provided in the valve group, making the entire oil inlet and return more safe and stable. Brief description of the drawings

[0021] Figure 1 It is a front structure schematic diagram of the present utility model;

[0022] Figure 2 It is a schematic diagram of the neutral structure of the valve stem on the reversing valve plate in the present utility model;

[0023] Figure 3 It is a schematic diagram of the forward movement of the valve stem on the reversing valve plate in the present utility model;

[0024] Figure 4 It is a schematic diagram of the backward movement of the valve stem on the reversing valve plate in the present utility model;

[0025] Figure 5 It is a schematic diagram of the hydraulic principle in the present utility model.

[0026] In the figure: 1. Inlet and return oil valve plate; 2. First reversing valve plate; 3. Second reversing valve plate; 4. Third reversing valve plate; 5. Fixed-displacement inlet oil valve plate; 6. Fourth reversing valve plate; 7. Tail plate; 8. First three-position four-way reversing valve; 9. Double-headed proportional electromagnet; 10. Fixed-differential pressure reducing valve; 11. Second three-position four-way reversing valve; 12. Shuttle valve; 13. Third three-position four-way reversing valve; 14. Secondary safety overflow valve 14; 15. Second damping; 16. Second hydraulic oil pump; 17. Fixed-differential overflow valve; 18. Fourth three-position four-way reversing valve; 19. Handle rod; 20. Second rotary motor; 21. First telescopic oil cylinder; 22. Second telescopic oil cylinder; 23. First rotary motor; 24. Connecting pressure reducing valve; 25. Filter; 26. Primary and secondary safety overflow valve 14; 27. Fixed-differential overflow valve; 28. First damping; 29. First hydraulic oil pump; 30. Connecting oil cylinder. Detailed implementation mode

[0027] In order to make the purpose, technical solution and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0028] Please refer to Figures 1-5 , the present utility model provides a technical solution: a load-sensitive double-pump upper vehicle valve for a truck-mounted crane, including an inlet and return oil valve plate 1, a first reversing valve plate 2, a second reversing valve plate 3, a third reversing valve plate 4, a fixed-displacement inlet oil valve plate 5, a fourth reversing valve plate 6 and a tail plate 7. The inlet and return oil valve plate 1, the first reversing valve plate 2, the second reversing valve plate 3, the third reversing valve plate 4, the fixed-displacement inlet oil valve plate 5, the fourth reversing valve plate 6 and the tail plate 7 are all connected by bolts to form a complete valve group;

[0029] The inlet and return oil valve plate 1 and the tail plate 7 are located at both ends of the valve group;

[0030] The inlet and return oil valve plate 1 is provided with a P port (inlet port, connected to the output port of the main pump), an R port (return port connected to the fuel tank), an M port (pressure gauge interface, measuring the inlet pressure of the multi-way valve), an LS port (load pressure feedback output port) and a Z port (pilot control oil port);

[0031] The first reversing valve plate 2, the second reversing valve plate 3, the third reversing valve plate 4 and the fourth reversing valve plate 6 are all provided with A / B ports (working oil ports, respectively connected to components such as motors and oil cylinders);

[0032] The fixed-displacement inlet oil valve plate 5 is provided with a P1 port (inlet port, connected to the output port of the copy);

[0033] The tailboard 7 is provided with a T port (control oil leakage port, and the T port is directly connected to the fuel tank). The first reversing valve plate 2, the second reversing valve plate 3, the third reversing valve plate 4 and the fourth reversing valve plate 6 are connected in parallel through two oil channels.

[0034] The A1 and B2 oil ports on the first reversing valve plate 2 are connected to the hoisting mechanism on the crane.

[0035] The A2 and B2 oil ports on the second reversing valve plate 3 are connected to the telescopic oil cylinder mechanism on the crane.

[0036] The A3 and B3 oil ports on the third reversing valve plate 4 are connected to the luffing oil cylinder mechanism on the crane.

[0037] The A4 and B4 oil ports on the fourth reversing valve plate 6 are connected to the slewing motor mechanism on the crane.

[0038] Furthermore, three-position four-way reversing valves are provided in the first reversing valve plate 2, the second reversing valve plate 3, the third reversing valve plate 4 and the fourth reversing valve plate 6.

[0039] Furthermore, the spool functions in the first reversing valve plate 2 and the second reversing valve plate 3 are the same and both belong to the H type.

[0040] Furthermore, the spool functions in the second reversing valve plate 3 and the third reversing valve plate 4 are the same and both belong to the L type.

[0041] Furthermore, the structures of the three-position four-way reversing valves are the same.

[0042] When the oil pump is started, the valve stems on all the reversing valve plates are in the neutral position. The hydraulic oil is pumped out of the fuel tank by the oil pump 29 and flows to a3, b3, c3, d3, and e1 is in the disconnected state. The other one passes through the overflow valve 26 and the differential overflow valve and returns to the fuel tank.

[0043] When the oil pump is started and the valve stem on the first reversing valve plate 2 is in the forward shift position while the other reversing valve plates remain unchanged, the oil inlet P → a3 → a1 → B1 → the first rotary motor 23 rotates in reverse and the hoisting function of the crane starts to wind back → A1 → a2 → a4 → R → the fuel tank.

[0044] When the oil pump is started and the valve stem on the second reversing valve plate 3 is in the forward shift position while the other reversing valve plates remain unchanged, the oil inlet P → b3 → b1 → B2 → the first telescopic oil cylinder 21 and the second telescopic oil cylinder 22 start to retract in the telescopic function → A2 → b2 → b4 → R → the fuel tank.

[0045] When the oil pump is started and the valve stem on the third reversing valve plate 4 is in the forward shift position while the other reversing valve plates remain unchanged, the oil inlet P → c3 → c1 → B3 → the luffing oil cylinder 30 performs the retracting function in the luffing function → A3 → c2 → c4 → R → the fuel tank.

[0046] When the oil pump is turned on and the upper valve stem of the fourth reversing valve plate 6 is in the forward displacement state while the other reversing valve plates remain unchanged, the oil inlet P → e1 → e2, under the action of the secondary safety overflow valve 1414, d3 → d1 → B4 → the second rotary motor 20, the rotational kinetic energy starts the motor to reverse → A4 → d2 → d4 → R → the fuel tank.

[0047] The inlet and return oil valve plate 1 is provided with a connecting pressure reducing valve 24, primary and secondary safety overflow valves 26, a fixed differential overflow valve 27, a secondary safety overflow valve 14, and a fixed differential overflow valve 17 connected to a common return oil passage to enhance the safety of the entire oil circuit.

[0048] The valve group is also provided with a connection to the oil cylinder 30, a filter 25, a first damper 28, a first hydraulic oil pump 29, a first three-position four-way reversing valve 8, four double-headed proportional electromagnets 9, four fixed differential pressure reducing valves 10, a second three-position four-way reversing valve 11, four shuttle valves 12, a third three-position four-way reversing valve 13, a second damper 15, a second hydraulic oil pump 16, a fourth three-position four-way reversing valve 18, and four handle rods 19.

[0049] The working principle and usage process of the present utility model: After the present utility model is installed, when the oil pump is turned on and the upper valve stems of all reversing valve plates are in the neutral position state, the hydraulic oil is pumped out of the fuel tank by the oil pump 29 and flows to a3, b3, c3, d3, and e1 is in the disconnected state, and the other passes through the overflow valve 26 and the fixed differential overflow valve back to the fuel tank; when the oil pump is turned on and the upper valve stem of the first reversing valve plate 2 is in the forward displacement state while the other reversing valve plates remain unchanged, the oil inlet P → a3 → a1 → B1 → the first rotary motor 23 reverses, and the crane hoisting function starts to reel back → A1 → a2 → a4 → R → the fuel tank; when the oil pump is turned on and the upper valve stem of the second reversing valve plate 3 is in the forward displacement state while the other reversing valve plates remain unchanged, the oil inlet P → b3 → b1 → B2 → the first telescopic oil cylinder 21 and the second telescopic oil cylinder 22, and the oil cylinder telescopic function starts to retract → A2 → b2 → b4 → R → the fuel tank; when the oil pump is turned on and the upper valve stem of the third reversing valve plate 4 is in the forward displacement state while the other reversing valve plates remain unchanged, the oil inlet P → c3 → c1 → B3 → the luffing oil cylinder 30, and the luffing function implements the retracting function → A3 → c2 → c4 → R → the fuel tank; when the oil pump is turned on and the upper valve stem of the fourth reversing valve plate 6 is in the forward displacement state while the other reversing valve plates remain unchanged, the oil inlet P → e1 → e2, under the action of the secondary safety overflow valve 1414, d3 → d1 → B4 → the second rotary motor 20, the rotational kinetic energy starts the motor to reverse → A4 → d2 → d4 → R → the fuel tank.

[0050] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A load-sensitive double-pump upper vehicle valve for a truck-mounted crane, characterized in that: It includes an oil inlet and outlet valve plate (1), a first reversing valve plate (2), a second reversing valve plate (3), a third reversing valve plate (4), a metering oil inlet valve plate (5), a fourth reversing valve plate (6) and a tail plate (7). The oil inlet and outlet valve plate (1), the first reversing valve plate (2), the second reversing valve plate (3), the third reversing valve plate (4), the metering oil inlet valve plate (5), the fourth reversing valve plate (6) and the tail plate (7) are all connected by bolts to form a complete valve group; The oil inlet and outlet valve plate (1) and the tail plate (7) are located at both ends of the valve group; The oil inlet and outlet valve plate (1) is provided with a P port, an R port, an M port, an LS port and a Z port; The first reversing valve plate (2), the second reversing valve plate (3), the third reversing valve plate (4) and the fourth reversing valve plate (6) are all provided with A / B ports; The metering oil inlet valve plate (5) is provided with a P1 port; The tail plate (7) is provided with a T port. The first reversing valve plate (2), the second reversing valve plate (3), the third reversing valve plate (4) and the fourth reversing valve plate (6) are connected in parallel through two oil channels; The A1 and B2 oil ports on the first reversing valve plate (2) are connected to the hoisting mechanism on the crane; The A2 and B2 oil ports on the second reversing valve plate (3) are connected to the telescopic oil cylinder mechanism on the crane; The A3 and B3 oil ports on the third reversing valve plate (4) are connected to the luffing oil cylinder mechanism on the crane; The A4 and B4 oil ports on the fourth reversing valve plate (6) are connected to the slewing motor mechanism on the crane.

2. The load-sensitive double-pump upper vehicle valve for a truck-mounted crane according to claim 1, wherein: Three-position four-way reversing valves are provided inside the first reversing valve plate (2), the second reversing valve plate (3), the third reversing valve plate (4) and the fourth reversing valve plate (6).

3. A load-sensitive double-pump upper vehicle valve for a truck-mounted crane according to claim 1, characterized in that: The spool functions inside the first reversing valve plate (2) and the second reversing valve plate (3) are the same and both belong to the H type.

4. A load-sensitive double-pump upper vehicle valve for a truck-mounted crane according to claim 1, characterized in that: The spool functions inside the second reversing valve plate (3) and the third reversing valve plate (4) are the same and both belong to the L type.

5. The load-sensitive double-pump upper vehicle valve for a truck-mounted crane according to claim 2, characterized in that: The structures of the three-position four-way reversing valves are the same.

Images