Load-sensitive linkage valve

Abstract

The utility model is suitable for the technical field of linkage valves, and provides a load-sensitive linkage valve which comprises an oil inlet and return valve plate, a rotary valve plate, a small pump oil inlet valve plate, a sequence valve plate, a speed regulation valve plate, a quantitative difference valve plate, an advancing and retreating valve plate, a control valve plate and a combined valve plate. The oil inlet and return valve plate, the rotary valve plate, the small pump oil inlet valve plate, the sequence valve plate, the speed regulation valve plate, the quantitative difference valve plate, the advancing and retreating valve plate, the control valve plate and the combined valve plate are connected through bolts to form a complete valve set. According to the load-sensitive linkage valve, a double-pump series system is adopted, electromagnetic proportional control and hydraulic control proportional control are added at the same time, so that the valve body has the advantages of being smaller in size, more stable and safer, two working conditions, three working conditions and four working conditions can be operated at the same time, double pumps are arranged in a valve set, and the whole oil inlet and return process is safer and more stable.

Description

Technical Field

[0001] The utility model belongs to the technical field of linkage valves, in particular to a load-sensitive linkage valve. Background Art

[0002] A linkage valve is a special control valve that uses a linkage mechanism to control parameters such as flow and pressure of a fluid medium. Its operating principle is based on changes in fluid pressure and the transmission of the linkage mechanism. When the fluid pressure in the pipeline changes, the sensor inside the linkage valve detects the change and transmits a signal to the control system.

[0003] In the prior art, the linkage valve is an important control device and is widely used in various fields. However, the existing linkage valve adopts a single pump series system during use, and has low stability and safety during operation. Utility Model Content

[0004] The utility model provides a load-sensitive linkage valve, aiming to solve the problem that the existing linkage valve adopts a single pump series system during use and has low stability and safety during operation.

[0005] The utility model is implemented as follows: a load-sensitive linkage valve comprises an oil inlet and return valve plate, a rotary valve plate, a small pump oil inlet valve plate, a sequence valve plate, a speed regulating valve plate, a quantitative differential valve plate, an inlet and retract valve plate, a control valve plate and a combined valve plate; the oil inlet and return valve plate, the rotary valve plate, the small pump oil inlet valve plate, the sequence valve plate, the speed regulating valve plate, the quantitative differential valve plate, the inlet and retract valve plate, the control valve plate and the combined valve plate are connected by bolts to form a complete valve group;

[0006] The oil inlet and return valve plates and the combined valve plates are located at both ends of the valve group;

[0007] The oil inlet and return valve plate is provided with a P port connected to the main pump output port, an R port connected to the oil tank, and an M port, an LS port and a Z port connected to a pressure gauge for measuring the inlet pressure of the multi-way valve.

[0008] Preferably, the rotary valve plate is provided with an A / B port connected to the connecting motor, and the small pump oil inlet valve plate is provided with a P2 port, and the P2 port is connected to the first two-position four-way reversing valve and the second two-position four-way reversing valve in the combined valve plate, and the small pump oil inlet valve plate includes several one-way valves.

[0009] Preferably, the sequence valve plate includes a sequence valve for replenishing oil supply to the main oil inlet circuit, and the quantitative difference valve plate includes a damper, a quantitative difference relief valve and a second safety relief valve for ensuring the safety and stability of the main oil circuit pressure.

[0010] Preferably, it further includes a balancing valve, which is provided with a B2 port, and the B2 port is connected to the propulsion cylinder. The balancing valve includes a balancing valve for ensuring the smoothness of the floating action and telescopic function of the propulsion cylinder.

[0011] Preferably, the inlet and outlet valve plate includes a third three-position four-way reversing valve for controlling the extension and retraction of the propulsion cylinder, and is provided with an A2 port connected to the propulsion cylinder.

[0012] Preferably, the control valve plate includes a second three-position four-way control valve for controlling the extension and retraction of the propulsion cylinder and the linkage function of the clamper and the hydraulic chuck in the linkage valve.

[0013] Preferably, the combined valve plate is provided with A3 port, B3 port and A4 port connected to the hydraulic chuck, which respectively control the tightening function of the hydraulic chuck and the clamping function of the clamper. The combined valve plate includes a third pressure reducing valve, a first two-position four-way reversing valve, a second two-position four-way reversing valve, the one-way throttle valve and two shuttle valves. The clamper is provided with an oil return port connected to the hydraulic oil tank.

[0014] Beneficial effects

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: a load-sensitive linkage valve of the present invention adopts a dual-pump series system and adds electromagnetic proportional control and hydraulic proportional control, so that the valve body has the advantages of smaller volume, greater stability and greater safety, and can operate simultaneously in two working conditions, three working conditions and four working conditions. A dual pump is arranged in the valve group, making the entire oil inlet and return safer and more stable. The linkage valve adopts a dual-spool control clamper and chuck, making the logical relationship between the chuck and the clamper more obvious and rapid. At the same time, a one-way valve is installed under the control of the dual-spool, and then under the cooperation of the valve core and the one-way valve, the chuck can be ensured to be in a clamped state in the instantaneous pressure-free state during the conversion of the logical relationship between the chuck and the clamp, so as to prevent the drill rod from sliding and falling. The joint valve plate is equipped with a hydraulic pilot control to realize the separate control of the clamper and the hydraulic chuck, and the clamper and the hydraulic chuck can also be opened at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the front structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the hydraulic principle in this utility model.

[0018] Figure: 1. Inlet and return valve plate; 2. Rotary valve plate; 3. Small pump inlet valve plate; 4. Sequence valve plate; 5. Speed ​​regulating valve plate; 6. Fixed differential valve plate; 7. Inlet and outlet valve plate; 8. Control valve plate; 9. Combined valve plate; 10. Motor; 11. Thrust cylinder; 12. Clamp; 13. Chuck; 14. First pressure reducing valve; 15. Filter; 16. First safety relief valve; 17. Second fixed differential relief valve; 18. Hydraulic oil pump; 19. Hydraulic oil tank. 20. Shuttle valve; 21. Proportional solenoid; 22. Fixed differential flow valve; 23. One-way valve; 24. First three-way four-position directional valve; 25. Damping valve; 26. Second fixed differential relief valve; 27. Second safety relief valve; 28. Balancing valve; 29. ​​Second three-way four-position directional valve; 30. Second pressure reducing valve; 31. Third pressure reducing valve; 32. First two-position four-way directional valve; 33. Second two-position four-way directional valve; 34. One-way throttle valve; 35. Sequence valve. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is 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 invention and are not intended to limit the present invention.

[0020] See also Figure 1 and Figure 2 The utility model provides a technical solution: a load-sensitive linkage valve, including an oil inlet and return valve plate 1, a rotary valve plate 2, a small pump oil inlet valve plate 3, a sequence valve plate 4, a speed regulating valve plate 5, a quantitative difference valve plate 6, an inlet and retreat valve plate 7, a control valve plate 8 and a combined valve plate 9. The oil inlet and return valve plate 1, the rotary valve plate 2, the small pump oil inlet valve plate 3, the sequence valve plate 4, the speed regulating valve plate 5, the quantitative difference valve plate 6, the inlet and retreat valve plate 7, the control valve plate 8 and the combined valve plate 9 are connected by bolts to form a complete valve group, and a filter 15 is provided on the valve group.

[0021] The valve group is provided with a hydraulic oil pump 18 , a proportional solenoid 21 , a fixed differential flow valve 22 , a second pressure reducing valve 30 , and a third pressure reducing valve 31 .

[0022] The oil inlet and return valve plate 1 and the combined valve plate 9 are located at both ends of the valve group;

[0023] The oil inlet and return valve plate 1 is provided with a P port connected to the main pump output port, an R port connected to the oil tank, and an M port, LS port and Z port connected to a pressure gauge for measuring the inlet pressure of the multi-way valve.

[0024] Furthermore, the rotary valve plate 2 is provided with an A / B port connected to the connecting motor 10, and the small pump oil inlet valve plate 3 is provided with a P2 port, which is connected to the first two-position four-way reversing valve 32 and the second two-position four-way reversing valve 33 in the combined valve plate 9. The small pump oil inlet valve plate 3 includes several one-way valves 23.

[0025] Furthermore, the sequence valve plate 4 includes a sequence valve 35 for replenishing oil supply to the main oil inlet circuit, and the quantitative difference valve plate 6 includes a damper 25, a quantitative difference relief valve and a second safety relief valve 27 for ensuring the safety and stability of the main oil circuit pressure.

[0026] Furthermore, it also includes a balancing valve plate, which is provided with a B2 port, and the B2 port is connected to the propulsion cylinder 11. The balancing valve 28 includes a balancing valve 28 for ensuring the stability of the floating action and telescopic function of the propulsion cylinder 11.

[0027] Furthermore, the inlet and outlet valve plate 7 includes a third three-position four-way reversing valve for controlling the extension and retraction of the propulsion cylinder 11 , and is provided with an A2 port connected to the propulsion cylinder 11 .

[0028] Furthermore, the control valve plate 8 includes a second three-position four-way control valve that controls the extension and contraction of the propulsion cylinder 11 and the functional linkage of the clamper 12 and the hydraulic chuck 13 in the linkage valve.

[0029] Furthermore, the combined valve plate 9 is provided with A3 port, B3 port and A4 port connected to the hydraulic chuck 13, which respectively control the loosening and tightening function of the hydraulic chuck 13 and the clamping function of the clamp 12. The combined valve plate 9 includes a third pressure reducing valve 31, a first two-position four-way reversing valve 32, a second two-position four-way reversing valve 33, a one-way throttle valve 34 and two shuttle valves 20. The clamp 12 is provided with an oil return port connected to the hydraulic oil tank 19.

[0030] By adopting a dual-pump series system and adding electromagnetic proportional control and hydraulic proportional control, the valve body has the advantages of smaller size, greater stability and greater safety, and can operate simultaneously in two, three and four working conditions. A dual pump is arranged in the valve group to make the entire oil inlet and return safer and more stable. The linkage valve adopts a dual-spool control clamper 12 and chuck 13, so that the logical relationship between the chuck 13 and the clamper 12 is more obvious and rapid. At the same time, a one-way valve 23 is installed under the control of the dual-spool, and then under the cooperation of the valve core and the one-way valve 23, the chuck 13 can be ensured to be in a clamped state in the instantaneous pressure-free state during the conversion of the logical relationship between the chuck 13 and the clamper 12, so as to prevent the drill rod from sliding and falling. The joint valve plate 9 is equipped with a hydraulic pilot control to realize the separate control of the clamper 12 and the hydraulic chuck 13, and can also make the clamper 12 and the hydraulic chuck 13 open at the same time.

[0031] The first three-way four-position reversing valve 24 and the second three-way four-position reversing valve 29 are connected in parallel via two main oil passages. Their structures are identical. The first three-way four-way reversing valve and the third three-way four-way reversing valve have identical internal valve cores, both of the H type, while the second three-way four-way reversing valve has identical internal valve cores, both of the L type.

[0032] The first pressure reducing valve 14, the first safety relief valve 16, the first differential relief valve 17, the second safety relief valve 27 and the second differential relief valve 26 are provided in the oil inlet and return valve plates and connected to the common oil return channel to improve the safety of the entire oil circuit.

[0033] 1. Drilling linkage operation:

[0034] The first three-position, four-way directional valve handle moves forward, oil is supplied to port B1, and motor 10 rotates forward. The second three-position, four-way directional valve handle moves backward, oil is supplied to port B3, and hydraulic chuck 13 is clamped. Oil is supplied to port A2, and clamp 12 opens. The third three-position, four-way valve handle moves backward, oil is supplied to port A2, and the cylinder advances. At this time, the clamp 12 opens, hydraulic chuck 13 clamps, and the cylinder advances. The handwheel on the combined valve plate 9 is used to adjust the propulsion speed.

[0035] 2. Adding rod operation:

[0036] When the first three-position four-way reversing valve handle is in the neutral position, oil supply to ports A1 and B1 stops, and motor 10 stops supplying oil. When the third three-position four-way reversing valve handle moves forward, oil is supplied to port B2, and the oil cylinder moves backward. When the second three-position four-way reversing valve handle is in the neutral position, the clamper 12 is clamped, and the chuck 13 is open. At this time, the state is: the clamper 12 is clamped, and the chuck 13 is open.

[0037] 3. Drill withdrawal linkage:

[0038] The first three-position, four-way directional control valve handle is in neutral. Oil supply to ports A1 and B1 is cut off, and motor 10 stops operating. The second three-position, four-way directional control valve handle is moved backward, hydraulic chuck 13 is clamped, and clamp 12 is opened. The third three-position, four-way directional control valve handle is moved forward, oil is supplied to port B2, and the hydraulic cylinder retracts. At this point, clamp 12 is opened, chuck 13 is clamped, and the hydraulic cylinder retracts.

[0039] 4. Remove the drill pipe thread:

[0040] The first three-position four-way directional valve handle moves backward and oil is supplied to the A1 port, and the motor 10 reverses. The third three-position four-way directional valve handle is in the neutral position, the cylinder floats, and the a1 pilot port supplies oil to control the clamping of the hydraulic chuck 13. Oil is supplied to the P2 port, and oil is supplied to the A4 port, and the clamper 12 is clamped. At this time, the status is: the clamper 12 is clamped, the chuck 13 is clamped, the cylinder floats, and the motor 10 reverses.

[0041] 5. Take the drill rod action:

[0042] The first three-position four-way reversing valve handle is in neutral. Oil supply to ports A1 and B1 stops, and motor 10 stops working. The second three-position four-way reversing valve handle is in neutral. Oil flows into port P2, and ports A3 and A4 supply oil to clamp holder 12, opening hydraulic chuck 13. The third three-position four-way valve handle moves backward, oil is supplied to port A2, and the cylinder moves forward.

[0043] The working principle and use process of the utility model: After the utility model is installed, a dual-pump series system is adopted, and electromagnetic proportional control and hydraulic proportional control are added, so that the valve body has the advantages of smaller size, more stability and safer, and can operate in two working conditions, three working conditions and four working conditions at the same time. A dual pump is arranged in the valve group, which makes the entire oil inlet and return safer and more stable. The linkage valve adopts a dual-spool control clamper 12 and chuck 13, so that the logical relationship between the chuck 13 and the clamper 12 is more obvious and rapid. At the same time, a one-way valve 23 is installed under the control of the dual-spool, and then under the cooperation of the valve core and the one-way valve 23, the chuck 13 can be ensured to be in a clamped state in the instantaneous pressure-free state during the conversion of the logical relationship between the chuck 13 and the clamper 12, so as to prevent the drill rod from sliding and falling. The joint valve plate 9 is equipped with a hydraulic pilot control to realize the separate control of the clamper 12 and the hydraulic chuck 13, and can also make the clamper 12 and the hydraulic chuck 13 open at the same time.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A load-sensitive linkage valve, comprising an oil inlet and return valve plate (1), a rotary valve plate (2), a small pump oil inlet valve plate (3), a sequence valve plate (4), a speed regulating valve plate (5), a quantitative difference valve plate (6), an inlet and outlet valve plate (7), a control valve plate (8) and a combined valve plate (9), characterized in that: The oil inlet and return valve plate (1), the rotary valve plate (2), the small pump oil inlet valve plate (3), the sequence valve plate (4), the speed regulating valve plate (5), the quantitative difference valve plate (6), the inlet and outlet valve plate (7), the control valve plate (8) and the combined valve plate (9) are connected by bolts to form a complete valve group; The oil inlet and return valve plate (1) and the combined valve plate (9) are located at both ends of the valve group; The oil inlet and return valve plate (1) is provided with a P port connected to the main pump output port, an R port connected to the oil tank, and an M port, an LS port and a Z port connected to a pressure gauge for measuring the inlet pressure of the multi-way valve.

2. A load-sensing linkage valve according to claim 1, characterized in that: The rotary valve plate (2) is provided with an A / B port connected to the connecting motor (10), and the small pump oil inlet valve plate (3) is provided with a P2 port, and the P2 port is connected to the first two-position four-way reversing valve (32) and the second two-position four-way reversing valve (33) in the combined valve plate (9). The small pump oil inlet valve plate (3) includes a plurality of one-way valves (23).

3. A load-sensing linkage valve according to claim 1, characterized in that: The sequence valve plate (4) includes a sequence valve (35) for replenishing the oil supply of the main oil inlet circuit, and the quantitative difference valve plate (6) includes a damper (25) for ensuring the safety and stability of the main oil circuit pressure, a quantitative difference relief valve, and a second safety relief valve (27).

4. A load-sensing linkage valve according to claim 1, characterized in that: It also includes a balancing valve plate, which is provided with a B2 port, the B2 port being connected to the propulsion oil cylinder (11), and the balancing valve plate including a balancing valve (28) for ensuring the stability of the floating action and telescopic function of the propulsion oil cylinder (11).

5. A load-sensing linkage valve according to claim 4, characterized in that: The inlet and outlet valve plate (7) includes a third three-position four-way reversing valve for controlling the extension and contraction of the propulsion oil cylinder (11), and is provided with an A2 port connected to the propulsion oil cylinder (11).

6. A load-sensing linkage valve according to claim 4, characterized in that: The control valve plate (8) includes a second three-position four-way control valve for controlling the extension and contraction of the propulsion oil cylinder (11) and the linkage function of the clamper (12) and the hydraulic chuck (13) in the linkage valve.

7. A load-sensing linkage valve according to claim 6, characterized in that: The combined valve plate (9) is provided with an A3 port, a B3 port, and an A4 port connected to the hydraulic chuck (13), respectively controlling the loosening and tightening functions of the hydraulic chuck (13) and the clamping function of the clamp (12). The combined valve plate (9) includes a third pressure reducing valve (31), a first two-position four-way reversing valve (32), a second two-position four-way reversing valve (33), a one-way throttle valve (34), and two shuttle valves (20). The clamp (12) is provided with an oil return port connected to the hydraulic oil tank (19).

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