Stepless positioning reversing handle for hydraulic reversing valve

Abstract

A stepless positioning reversing handle for a hydraulic reversing valve comprises a valve cover, a handle rod and a valve rod, and is characterized in that a rotatable connecting rod is installed in the valve cover, the connecting rod is connected with a limiting column connected to one end of the valve rod in a clamped mode through a protruding head on the outer edge of a cam, a positioning block is fixed to the connecting rod, and one end of the handle rod is connected into a positioning hole formed in the positioning block; a fixing plate is arranged on the valve cover and located on one side of the positioning block, a U-shaped groove is formed in the fixing plate, and the lower half portion of the outer edge of the positioning block is in an arc shape and embedded into the U-shaped groove. The other end of the handle rod is connected with a handle sleeve through threads, a long rod penetrates through the handle rod, one end of the long rod penetrates through the connecting rod and the positioning hole, and the other end of the long rod abuts against the inner bottom face 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 and capable of achieving the positioning function at any position; and the position of the valve rod can be finely adjusted.

Description

Technical Field

[0001] The utility model relates to a reversing handle, in particular to a stepless positioning reversing handle for a hydraulic reversing valve. Background Art

[0002] A hydraulic reversing valve is a direction control valve with more than two flow forms and more than two oil ports, and is a valve for realizing the communication, cut-off and reversal of a hydraulic oil circuit, as well as pressure unloading and sequence action control. The hydraulic reversing valve realizes the switching of the oil circuit by the relative movement of the valve stem and the valve body. The function of the reversing handle is to control the horizontal reciprocating movement of the valve stem in the reversing valve, so as to change the flow direction of the pressure oil in the hydraulic reversing valve.

[0003] At present, the common hydraulic reversing handle adopts a lever structure, which has stable reversing and is labor-saving. After reversing, it can be fixed by a positioning mechanism arranged in the valve cover. However, it is very inconvenient when it is necessary to adjust the distance that the control valve stem moves, and due to its structural limitation, the positioning accuracy is poor, thus affecting the working performance of the reversing valve. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a stepless positioning reversing handle for a hydraulic reversing valve which is convenient to operate, has stable reversing and can realize the positioning function at any position.

[0005] The technical solution of the utility model is as follows:

[0006] A stepless positioning reversing handle for a hydraulic reversing valve, comprising a valve cover, a handle rod and a valve stem, and is characterized in that: a rotatable connecting rod is installed in the valve cover, a cam is arranged on the connecting rod inside the valve cover, the convex head on the outer edge of the cam is clamped with a limit post connected to one end of the valve stem, and is used to drive the axial movement of the valve stem to realize reversing;

[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 in a positioning hole arranged on the positioning block and is used to drive the positioning block and the connecting rod to rotate; a fixing plate is arranged on the valve cover at one side of the positioning block, a U-shaped groove is arranged 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 connected to the other end of the handle rod by a thread, and a long rod is inserted into 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 to realize the axial limit of the long rod; 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 to realize the positioning of the handle rod and the valve stem.

[0009] A stepped mounting hole is provided on the valve cover, the connecting rod is in the shape of a stepped shaft and the inner end is plugged into the inner end of the mounting hole through clearance fit, and a pressure cover sleeved on the connecting rod is threadedly connected to the outer port of the mounting hole to achieve axial limiting of the connecting rod.

[0010] As a further preference, a gasket is provided in the positioning hole between the disc spring and the long rod, and the gasket and the friction head are clearance-matched with the inner diameter of the positioning hole.

[0011] As a further preference, the friction head is made of wear-resistant material.

[0012] As a further preference, one end of the limit column is connected to the valve stem through a thread, and the other end of the limit column is provided with a U-shaped groove and is plugged into the convex head through a clearance fit.

[0013] As a further preference, the central hole of the cam is square, and the shaft section on the connecting rod corresponding to the installation of the cam is square columnar and plugged into the central hole of the cam.

[0014] As a further preference, two adjusting screws arranged up and down are screwed into the valve cover, and the inner ends of the two adjusting screws are respectively inserted into the mounting hole and the limit column socket provided on the valve cover, so as to adjust the extreme angle of the cam swing, thereby adjusting the maximum displacement that the valve stem can move.

[0015] As a further preference, sealing rings are provided between the gland and the connecting rod and the valve cover respectively to prevent leakage of the hydraulic oil in the valve cover.

[0016] As a further preference, the center hole of the positioning block is square, the outer end of the connecting rod is square column-shaped and plugged into the center hole of the positioning block, and the positioning block is fixed to the connecting rod by a top screw.

[0017] The beneficial effects of the utility model are:

[0018] 1. The reversing handle drives the positioning block and the connecting rod to rotate through the handle rod, which can drive the valve stem to move axially to achieve reversal. During reversing, the friction head presses against the inner edge of the U-shaped groove under the pressure of the disc spring and the long rod, so that the handle rod and the valve stem can be positioned at any position after reversing; and the valve stem position can be finely adjusted, which greatly improves the adaptability to different reversing valves.

[0019] 2. Since a handle sleeve is threadedly connected to the other end of the handle rod, and a long rod is inserted into the handle rod, the other end of the long rod rests against the bottom surface of the handle sleeve. The pressure of the long rod on the disc spring and the friction head can be released by rotating the handle sleeve. Therefore, when the reversing valve adopts electric control, the handle can realize the automatic positioning function of closing. At this time, the handle rod can swing arbitrarily without affecting the control of the valve stem by the electric control.

[0020] 3. The reversing handle is locked and positioned by the friction force between the friction head and the fixed plate. Since the working parameters of different valve bodies are different, the springs connected to the valve stem are different, and the spring forces to be overcome when positioning the valve stem are also different. When positioning the reversing handle, by adjusting the position of the handle sleeve, the friction force between the friction head and the inner edge of the U-shaped groove can be adjusted, so as to adapt to reversing valve bodies with different working parameters.

[0021] 4. The positioning function of the reversing handle can be arbitrarily turned on and off, with simple and convenient operation, and can work stably in extreme environments such as severe vibration. Brief Description of the Drawings

[0022] Figure 1 is a schematic structural view of the present utility model.

[0023] Figure 2 is Figure 1 the right view of

[0024] Figure 3 is Figure 2 the A-A sectional view of

[0025] Figure 4 is Figure 1 the B-B sectional view of

[0026] Figure 5 is Figure 2 the C-C sectional view of

[0027] In the figure: fixed plate 1, positioning block 2, connecting rod 3, connecting screw 4, valve cover 5, limit post jack 501, handle rod 6, handle sleeve 7, friction head 8, disc spring 9, gasket 10, screw 11, locking nut 12, long rod 13, set screw 14, sealing ring 15, gland 16, cam 17, sealing nut 18, adjusting screw 19, limit post 20, valve stem 21. Detailed Embodiment

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0029] Such as Figures 1 to 5As shown in the figure, a positioning and reversing handle for a hydraulic reversing valve according to the present utility model includes 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 reversing 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 in the valve cover 5, and a cam 17 is provided in the valve cover 5 on the connecting rod 3. The arc-shaped convex head on the outer edge of the cam 17 is clamped with a limit post 20 connected to one end of the valve rod 21, so as to drive the axial movement of the valve rod 21 to achieve reversing.

[0030] A stepped mounting hole is provided on the valve cover 5. The connecting rod 3 is in the shape of a stepped shaft, and the inner end thereof is inserted into the inner end of the mounting hole by clearance fit. A gland 16 sleeved on the connecting rod 3 is connected by thread at the outer port of the mounting hole to achieve the axial limit of the connecting rod 3. Sealing rings 15 are respectively provided between the inner hole of the gland 16 and the connecting rod 3 and between the outer edge of the gland 16 and the valve cover 5 to prevent the leakage of hydraulic oil in the valve cover 5.

[0031] The limit post 20 is located in a limit post jack 501 provided on the valve cover 5. One end of the limit post 20 is connected to the valve rod 21 by thread, and the other end of the limit post 20 is provided with a U-shaped groove and is inserted into the convex head of the cam 17 by clearance fit. The central hole of the cam 17 is square, and the shaft section on the connecting rod 3 corresponding to the installation of the cam 17 is square and is inserted into the central hole of the cam 17.

[0032] A positioning block 2 is fixed to the outer end of the connecting rod 3 outside the valve cover 5. The central hole of the positioning block 2 is square, and the outer end of the connecting rod 3 is square and is inserted into the central hole of the positioning block 2 by 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.

[0033] A positioning hole perpendicular to and communicating with the central hole is provided on the positioning block 2. One end of the handle rod 6 is connected to the positioning hole by thread and locked by a locking nut 12 threaded on the handle rod 6, so as to drive the positioning block 2 and the connecting rod 3 to rotate. A fixing plate 1 is fixed to one side of the positioning block 2 on the valve cover 5 by a screw 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.

[0034] At the other end of the handle rod 6, a handle sleeve 7 is connected by threads, and a long rod 13 is inserted into the handle rod 6. One end of the long rod 13 penetrates 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 realize the axial limit of the long rod 13. In the positioning hole, a gasket 10, a disc spring 9, and a friction head 8 are sequentially arranged corresponding to one end of the U-shaped groove 101. The gasket 10 and the friction head 8 are in clearance fit with the inner diameter of the positioning hole. The friction head 8 abuts against the inner edge of the U-shaped groove 101 under the pressure of the disc spring 9 and the long rod 13 to realize the positioning of the handle rod 6 and the valve rod. The friction head 8 is made of a non-metallic wear-resistant material, which is phenolic cloth in this embodiment.

[0035] 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 installation hole and the limit post insertion hole 501. When the outer edge of the cam 17 swings to the extreme angles at both ends, the inner ends of the limit post 20 respectively abut against the inner ends of the two adjusting screws 19, which is used to adjust the extreme angle of the cam swing, so as to adjust the maximum displacement that the valve rod can move.

[0036] Sealing nuts 18 are respectively connected by threads to the outer ends of the two adjusting screws 19, which are used to lock the adjusting screws and prevent the hydraulic oil in the valve cover from flowing out and affecting the working performance of the reversing valve.

[0037] During operation, pushing the handle sleeve 7 drives the handle rod 6, the positioning block 2, the connecting rod 3, and the cam 17 to rotate around the center of the connecting rod. The cam 17 pushes the limit post to move horizontally, and then drives the valve rod to move horizontally in the valve body to achieve the purpose of reversing. When the valve rod moves an appropriate distance and then stops being pushed, due to the frictional force between the friction head 8 and the inner edge of the U-shaped groove of the fixed plate 1, the reversing handle remains fixed at the pushed position, and then the valve rod remains stationary at a certain reversing position.

[0038] When the hydraulic reversing valve adopts electric control and does not require the automatic positioning function, rotate the handle sleeve 7 outwards so that the large head end at the lower end of the long rod 13 no longer presses tightly on the gasket and the disc spring 9, and the friction head 8 no longer presses tightly on the inner edge of the U-shaped groove. In this state, the reversing handle has no positioning function and can swing arbitrarily, thus avoiding affecting the control of the solenoid valve.

[0039] Although the implementation scheme of the present invention has been disclosed above, it is not limited to only the applications listed in the description and implementation. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrations shown and described here.

Claims

1. An infinitely variable positioning reversing handle for a 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, and a cam is arranged on the connecting rod in the valve cover. The convex head on the outer edge of the cam is engaged with a limit column connected to one end of the valve stem 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, and one end of the handle rod is connected to a positioning hole provided on the positioning block, so as to drive the positioning block and the connecting rod to rotate; a fixing plate is provided on the valve cover at one side of the positioning block, and a U-shaped groove is provided on the fixing plate, and the lower half of the outer edge of the positioning block is arc-shaped and embedded in the U-shaped groove; The other end of the handle rod is connected with a handle sleeve by a thread, and a long rod is inserted in 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 inner bottom surface of the handle sleeve to achieve axial limitation of the long rod; 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 to achieve the positioning of the handle rod and the valve stem; A stepped mounting hole is provided on the valve cover, the connecting rod is in the shape of a stepped shaft and the inner end is plugged into the inner end of the mounting hole through clearance fit, and a pressure cover sleeved on the connecting rod is threadedly connected to the outer port of the mounting hole to achieve axial limiting of the connecting rod.

2. The infinitely variable positioning reversing handle for a hydraulic reversing valve according to claim 1, characterized in that: A gasket is arranged in the positioning hole between the disc spring and the long rod, and the gasket and the friction head are in clearance fit with the inner diameter of the positioning hole.

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

4. The infinitely variable positioning reversing handle for a hydraulic reversing valve according to claim 1, characterized in that: One end of the limit column is connected to the valve stem through a thread, and the other end of the limit column is provided with a U-shaped groove and is plugged with the convex head through a clearance fit.

5. The infinitely variable positioning reversing handle for a hydraulic reversing valve according to claim 1 or 4, characterized in that: The central hole of the cam is square, and the shaft section on the connecting rod corresponding to the installation of the cam is square column-shaped and plugged into the central hole of the cam.

6. The infinitely-positionable reversing handle for a hydraulic reversing valve according to claim 1 is characterized in that: in Two adjusting screws arranged up and down are screwed into the valve cover, and the inner ends of the two adjusting screws are respectively inserted into the mounting hole and the limit column jack arranged on the valve cover to adjust the limit angle of the cam swing, thereby adjusting the maximum displacement that the valve stem can move.

7. The infinitely variable positioning reversing handle for a hydraulic reversing valve according to claim 1, characterized in that: Sealing rings are provided between the gland, the connecting rod and the valve cover to prevent leakage of hydraulic oil in the valve cover.

8. The infinitely variable positioning reversing handle for a hydraulic reversing valve according to claim 1, characterized in that: The center hole of the positioning block is square, the outer end of the connecting rod is square column-shaped and plugged into the center hole of the positioning block, and the positioning block is fixed to the connecting rod by a top screw.

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