Stepless positioning reversing handle for hydraulic reversing valve

Abstract

A stepless positioning reversing handle for hydraulic reversing valve, comprising a valve cover, a handle rod and a valve rod, characterized in that: a rotatable connecting rod is installed in the valve cover, the connecting rod is in transmission connection with the valve rod inserted into the valve cover; a positioning block is fixed on the connecting rod at the outer end of the valve cover, one end of the handle rod is connected into a positioning hole arranged on the positioning block; a fixed plate is arranged on the valve cover at one side of the positioning block, a U-shaped groove is arranged on the fixed plate, the outer edge of the lower half of the positioning block is arc-shaped and is embedded into the U-shaped groove; a handle sleeve is threadedly connected to the other end of the handle rod, and a long rod is arranged in the handle rod, one end of the long rod penetrates through the connecting rod and the positioning hole, and the other end abuts against the inner bottom surface of the handle sleeve; a disc spring and a friction head are arranged in the positioning hole, and the friction head abuts against the inner edge of the U-shaped groove under the pressure of the disc spring and the long rod. The reversing handle is convenient to operate, stable in reversing, can realize the positioning function at any position, and can finely adjust the position of the valve rod.

Description

Technical Field

[0001] This invention relates to a reversing handle, and more particularly to a stepless positioning reversing handle for a hydraulic reversing valve. Background Technology

[0002] A hydraulic directional control valve is a directional control valve with two or more flow patterns and two or more ports. It is used to connect, disconnect, and reverse hydraulic circuits, as well as to unload pressure and control sequential actions. The hydraulic directional control valve switches oil circuits by the relative movement of the valve stem and valve body. The function of the directional control handle is to control the horizontal reciprocating movement of the valve stem within the directional control valve, thereby changing the flow direction of the pressurized oil within the hydraulic directional control valve.

[0003] Currently, most hydraulic directional control handles adopt a lever structure, which is stable and labor-saving for directional control. After directional control, the handle can be fixed by a positioning mechanism located inside the valve cover. However, it is inconvenient when it is necessary to adjust the distance that the control valve rod moves. Furthermore, due to its structural limitations, the positioning accuracy is poor, which affects the working performance of the directional control valve. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a stepless positioning reversing handle for a hydraulic reversing valve that is easy to operate, has stable reversing, and can achieve positioning function at any position.

[0005] The technical solution of the present invention is as follows:

[0006] A continuously variable positioning directional control handle for a hydraulic directional control valve includes a valve cover, a handle rod, and a valve rod. Its special feature is that a rotatable connecting rod is installed inside the valve cover. The connecting rod is connected to the valve rod inserted into the valve cover and is used to drive the valve rod to move axially to achieve directional control.

[0007] A positioning block is fixed on the connecting rod at the outer end of the valve cover. One end of the handle rod is connected to the positioning hole provided on the positioning block, which is used to drive the positioning block and the connecting rod to rotate. A fixing plate is provided on the valve cover on one side of the positioning block. A U-shaped groove is provided on the fixing plate. The lower half of the outer edge of the positioning block is arc-shaped and is embedded in the U-shaped groove.

[0008] A handle sleeve is threaded to the other end of the handle rod, and a long rod is inserted inside the handle rod. One end of the long rod passes through the connecting rod and the positioning hole, and the other end abuts against the bottom surface of the handle sleeve to achieve axial positioning of the long rod. A disc spring and a friction head are provided in the positioning hole. The friction head abuts against the inner edge of the U-shaped groove under the pressure of the disc spring and the long rod to achieve positioning of the handle rod and the valve rod.

[0009] As a further preferred embodiment, a shim is provided in the positioning hole between the disc spring and the long rod, and the shim and the friction head are clearance-fitted with the inner diameter of the positioning hole.

[0010] As a further preferred option, the friction head is made of a wear-resistant material.

[0011] As a further preferred option, a cam is provided on the connecting rod inside the valve cover. The protrusion on the outer edge of the cam engages with a limiting post connected to one end of the valve stem to drive the valve stem to move axially and achieve reversal.

[0012] As a further preferred embodiment, one end of the limiting post is connected to the valve stem by a thread, and the other end of the limiting post is provided with a U-shaped groove and is inserted into the protrusion through a clearance fit.

[0013] As a further preferred embodiment, the central hole of the cam is square, and the shaft segment on the connecting rod corresponding to the mounting of the cam is square prism and is inserted into the central hole of the cam.

[0014] As a further preferred embodiment, the valve cover is provided with a stepped mounting hole, the connecting rod is a stepped shaft and its inner end is inserted into the inner end of the mounting hole through a clearance fit, and a pressure cap sleeved on the connecting rod is connected to the outer port of the mounting hole through a thread to realize the axial positioning of the connecting rod.

[0015] As a further preferred option, two adjusting screws arranged vertically are screwed into the valve cover. The inner ends of the two adjusting screws are respectively inserted into the mounting hole and the limiting post insertion hole on the valve cover, which are used to adjust the limit angle of the cam swing, thereby adjusting the maximum displacement that the valve stem can move.

[0016] As a further preferred option, sealing rings are provided between the gland and the connecting rod and the valve cover respectively to prevent leakage of hydraulic oil inside the valve cover.

[0017] As a further preferred embodiment, the center hole of the positioning block is square, the outer end of the connecting rod is square prism and is inserted into the center hole of the positioning block, and the positioning block is fixed to the connecting rod by a set screw.

[0018] The beneficial effects of this invention are:

[0019] 1. The reversing handle drives the positioning block and connecting rod to rotate through the handle rod, which in turn drives the valve stem to move axially to achieve reversing. During reversing, the friction head abuts against the inner edge of the U-shaped groove under the pressure of the disc spring and the long rod, which can achieve positioning of the handle rod and valve stem at any position after reversing; and it can make fine adjustments to the position of the valve stem, which greatly improves the adaptability to different reversing valves.

[0020] 2. Because a handle sleeve is threaded to the other end of the handle rod, and a long rod is inserted inside the handle rod, with the other end of the long rod resting against the bottom surface of the handle sleeve, the pressure of the long rod on the disc spring and friction head can be released by rotating the handle sleeve. Therefore, when the reversing valve is electrically controlled, this handle can achieve the automatic closing positioning function. At this time, the handle rod can swing freely without affecting the control of the valve rod by the electric control.

[0021] 3. The reversing handle relies on the friction between the friction head and the fixed plate for locking and positioning. Different valve bodies have different working parameters, so the springs connected to the valve stem are different, and the spring force that needs to be overcome when positioning the valve stem is also different. When positioning the reversing handle, the friction between the friction head and the inner edge of the U-shaped groove can be adjusted by adjusting the position of the handle sleeve, so as to adapt to reversing valve bodies with different working parameters.

[0022] 4. The reversing handle positioning function can be turned on and off at will, making it simple and convenient to operate, and it can work stably in extreme environments such as severe vibration. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention.

[0024] Figure 2 yes Figure 1 The right view.

[0025] Figure 3 yes Figure 2 AA sectional view.

[0026] Figure 4 yes Figure 1 BB cross-sectional view.

[0027] Figure 5 yes Figure 2 CC section view.

[0028] In the diagram: 1. Fixed plate; 2. Positioning block; 3. Connecting rod; 4. Connecting screw; 5. Valve cover; 501. Limit pin insertion hole; 6. Handle rod; 7. Handle sleeve; 8. Friction head; 9. Disc spring; 10. Washer; 11. Screw; 12. Locking nut; 13. Long rod; 14. Set screw; 15. Sealing ring; 16. Pressure cap; 17. Cam; 18. Sealing nut; 19. Adjusting screw; 20. Limit pin; 21. Valve stem. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] like Figures 1-5As shown, the present invention relates to a positioning and reversing handle for a hydraulic directional valve, comprising a valve cover 5, a handle rod 6, and a valve rod 21. The valve cover 5 is fixed to one side of the valve body of the hydraulic directional valve by four connecting screws 4, and the valve rod 21 is inserted into the valve cover 5. A rotatable connecting rod 3 is installed inside the valve cover 5, and a cam 17 is provided on the connecting rod 3 inside the valve cover 5. The arc-shaped protrusion on the outer edge of the cam 17 engages with a limiting post 20 connected to one end of the valve rod 21, for driving the valve rod 21 to move axially to achieve reversing.

[0031] A stepped mounting hole is provided on the valve cover 5. The connecting rod 3 is a stepped shaft, and its inner end is inserted into the inner end of the mounting hole through a clearance fit. A pressure cap 16 is threadedly connected to the outer port of the mounting hole and sleeved on the connecting rod 3 to achieve axial positioning of the connecting rod 3. Sealing rings 15 are provided between the inner hole of the pressure cap 16 and the connecting rod 3, and between the outer edge of the pressure cap 16 and the valve cover 5, to prevent leakage of hydraulic oil inside the valve cover 5.

[0032] The limiting post 20 is located in the limiting post insertion hole 501 on the valve cover 5. One end of the limiting post 20 is threadedly connected to the valve stem 21, and the other end of the limiting post 20 is provided with a U-shaped groove and is inserted into the protrusion of the cam 17 through a clearance fit. The center hole of the cam 17 is square, and the shaft segment on the connecting rod 3 corresponding to the mounting of the cam 17 is square prism and is inserted into the center hole of the cam 17.

[0033] A positioning block 2 is fixed on the connecting rod 3 at the outer end of the valve cover 5. The center hole of the positioning block 2 is square, and the outer end of the connecting rod 3 is square prism and is inserted into the center hole of the positioning block 2 through clearance fit. The upper half of the outer edge of the positioning block 2 is trapezoidal and the lower half is arc-shaped, and it is fixed to the connecting rod 3 by two symmetrically arranged set screws 14.

[0034] The positioning block 2 has a positioning hole that is perpendicularly connected to its center hole. One end of the handle rod 6 is threaded into the positioning hole and locked by a locking nut 12 threaded onto the handle rod 6, which is used to drive the positioning block 2 and the connecting rod 3 to rotate. A fixing plate 1 is fixed to the valve cover 5 on one side of the positioning block 2 by screws 11. A U-shaped groove 101 is provided on the fixing plate 1, and the positioning block 2 is embedded in the U-shaped groove 101.

[0035] A handle sleeve 7 is threadedly connected to the other end of the handle rod 6, and a long rod 13 is inserted inside the handle rod 6. One end of the long rod 13 passes through the connecting rod 3 and the positioning hole, and the other end abuts against the inner bottom surface of the handle sleeve 7 to achieve axial positioning of the long rod 13. A washer 10, a disc spring 9, and a friction head 8 are sequentially provided at one end of the U-shaped groove 101 in the positioning hole. The washer 10 and the friction head 8 are clearance-fitted with the inner diameter of the positioning hole. Under the pressure of the disc spring 9 and the long rod 13, the friction head 8 abuts against the inner edge of the U-shaped groove 101 to achieve positioning of the handle rod 6 and the valve stem. The friction head 8 is made of non-metallic wear-resistant material, and in this embodiment, it is phenolic resin reinforced with cloth.

[0036] Two adjusting screws 19 arranged vertically are screwed into the valve cover 5. The inner ends of the two adjusting screws 19 are respectively inserted into the mounting hole and the limiting post insertion hole 501. When the cam 17 swings to the limit angle at both ends, its outer edge and the inner end of the limiting post 20 respectively abut against the inner ends of the two adjusting screws 19, which is used to adjust the limit angle of the cam swing, thereby adjusting the maximum displacement that the valve stem can move.

[0037] Sealing nuts 18 are threadedly connected to the outer ends of the two adjusting screws 19 to lock the adjusting screws and prevent hydraulic oil from flowing out of the valve cover and affecting the working performance of the directional valve.

[0038] During operation, pushing the handle sleeve 7 causes the handle rod 6, positioning block 2, connecting rod 3, and cam 17 to rotate around the center of the connecting rod. Cam 17 pushes the limiting pin to move horizontally, thereby causing the valve stem to move horizontally within the valve body to achieve the purpose of reversing. When the valve stem moves a suitable distance, pushing stops. Due to the friction between the friction head 8 and the inner edge of the U-shaped groove of the fixing plate 1, the reversing handle remains fixed in the pushed position, thus keeping the valve stem stationary at a certain reversing position.

[0039] When the hydraulic directional valve is electrically controlled and does not require automatic positioning, rotate the handle sleeve 7 outward so that the large end of the lower end of the long rod 13 is no longer pressing tightly against the gasket and disc spring 9, and the friction head 8 is no longer pressing tightly against the inner edge of the U-shaped groove. In this state, the directional handle has no positioning function and can swing freely, thereby avoiding any impact on the control of the solenoid valve.

[0040] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A continuously variable positioning directional control handle for a hydraulic directional valve, comprising a valve cover, a handle rod, and a valve stem, characterized in that: A rotatable connecting rod is installed inside the valve cover. The connecting rod is connected to the valve stem inserted into the valve cover and is used to drive the valve stem to move axially to achieve reversal. A positioning block is fixed on the connecting rod at the outer end of the valve cover. One end of the handle rod is connected to the positioning hole provided on the positioning block, which is used to drive the positioning block and the connecting rod to rotate. A fixing plate is provided on the valve cover on one side of the positioning block. A U-shaped groove is provided on the fixing plate. The lower half of the outer edge of the positioning block is arc-shaped and is embedded in the U-shaped groove. A handle sleeve is threaded to the other end of the handle rod, and a long rod is inserted inside the handle rod. One end of the long rod passes through the connecting rod and the positioning hole, and the other end abuts against the bottom surface of the handle sleeve to achieve axial positioning of the long rod. A disc spring and a friction head are provided in the positioning hole. The friction head abuts against the inner edge of the U-shaped groove under the pressure of the disc spring and the long rod to achieve positioning of the handle rod and the valve rod.

2. The stepless positioning directional control handle for a hydraulic directional valve according to claim 1, characterized in that: A shim is provided inside the positioning hole between the disc spring and the long rod, and the shim and the friction head are clearance-fitted with the inner diameter of the positioning hole.

3. A continuously variable positioning directional control handle for a hydraulic directional valve according to claim 1 or 2, characterized in that: The friction head is made of wear-resistant material.

4. A continuously variable positioning directional control handle for a hydraulic directional valve according to claim 1, characterized in that: in A cam is located inside the valve cover on the connecting rod. The protrusion on the outer edge of the cam engages with a limiting post connected to one end of the valve stem, which is used to drive the valve stem to move axially to achieve reversal.

5. A continuously variable positioning directional control handle for a hydraulic directional valve according to claim 4, characterized in that: One end of the limiting post is threaded to the valve stem, and the other end of the limiting post is provided with a U-shaped groove and is inserted into the protrusion through a clearance fit.

6. A continuously variable positioning directional control handle for a hydraulic directional valve according to claim 4 or 5, characterized in that: The center hole of the cam is square, and the shaft segment on the connecting rod corresponding to the cam is square prism and is inserted into the center hole of the cam.

7. A continuously variable positioning directional control handle for a hydraulic directional valve according to claim 1, characterized in that: in The valve cover is provided with stepped mounting holes. The connecting rod is stepped shaft-shaped and its inner end is inserted into the inner end of the mounting hole through clearance fit. A pressure cap sleeved on the connecting rod is threaded into the outer port of the mounting hole to achieve axial positioning of the connecting rod.

8. A continuously variable positioning directional control handle for a hydraulic directional valve according to claim 4, characterized in that: in Two adjusting screws, arranged vertically, are screwed into the valve cover. The inner ends of the two adjusting screws are respectively inserted into the mounting hole and the limiting post insertion hole on the valve cover, which are used to adjust the limit angle of the cam swing, thereby adjusting the maximum displacement that the valve stem can move.

9. A continuously variable positioning directional control handle for a hydraulic directional valve according to claim 7, characterized in that: Sealing rings are provided between the gland, connecting rod, and valve cover to prevent leakage of hydraulic oil inside the valve cover.

10. A continuously variable positioning directional control handle for a hydraulic directional valve according to claim 1, characterized in that: The center hole of the positioning block is square, and the outer end of the connecting rod is square prism and is inserted into the center hole of the positioning block. The positioning block is fixed to the connecting rod by a set screw.

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