Positioning reversing handle for hydraulic reversing valve

Abstract

A 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, a cam is arranged on the connecting rod inside the valve cover, a lug on the outer end of the cam is connected with a limiting column connected with one end of the valve rod; a positioning block is fixed on the connecting rod outside the valve cover, the handle rod is connected with a positioning hole arranged on the positioning block in the radial direction of the connecting rod; a fixing plate is arranged on one side of the positioning block on the valve cover, a plurality of elastic pin shafts are evenly distributed around the outer edge of the positioning block on the fixing plate, the positioning block is inserted with the corresponding elastic pin shafts through the positioning hole when rotating; an adjusting nut is connected with the outer end of the handle rod, a long rod is arranged in the handle rod, one end of the long rod penetrates through the connecting rod and the positioning hole, the other end penetrates through the adjusting nut and is connected with a limiting sleeve, the limiting sleeve is inserted with the adjusting nut, a positioning screw is arranged in the radial direction of the adjusting nut. The reversing handle has the positioning function, does not need to be manually held and is easy to operate.

Description

Technical Field

[0001] This invention relates to a reversing handle, and more particularly to a 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, hydraulic reversing handles generally adopt a lever structure, which makes reversing stable and effortless, but cannot remain fixed after reversing. When the hydraulic valve needs to be kept in a certain reversing state, the handle needs to be manually supported by the operator, which is very inconvenient, and long-term manual support will increase the operator's workload. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a positioning and reversing handle for a hydraulic directional valve that has a positioning function, requires no manual support, and is easy to operate.

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

[0006] A positioning and reversing handle for a hydraulic directional valve includes a valve cover, a handle rod, and a valve rod. The special feature is that a rotatable connecting rod is installed inside the valve cover, and a cam is provided on the connecting rod inside the valve cover. The protrusion at the outer end of the cam engages with a limiting post connected to one end of the valve rod to drive the valve rod to move axially and realize reversing.

[0007] A positioning block is fixed on the connecting rod at the outer end of the valve cover. The handle rod is radially connected to the positioning hole on the positioning block 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. Multiple elastic pins are evenly distributed around the outer edge of the positioning block on the fixing plate. When the positioning block rotates, it is inserted into the corresponding elastic pin through the positioning hole to realize the reversing positioning of the valve rod.

[0008] An adjusting nut is connected to the outer 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 passes through the adjusting nut and is connected to a limit sleeve. The limit sleeve is inserted into the adjusting nut. A positioning screw is provided on the adjusting nut in the radial direction to realize the axial positioning of the long rod, so that one end of the long rod extends out of the positioning hole to realize the electric control of the valve rod.

[0009] 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.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] As a further preferred embodiment, a U-shaped groove is provided on the fixing plate, the upper half of the outer edge of the positioning block is trapezoidal and the lower half is arc-shaped, and the positioning block is embedded in the U-shaped groove.

[0015] As a further preferred embodiment, the elastic pin includes a pin, a pressure spring, and a spring seat. The pin is inserted into a through hole provided on the fixing plate through a clearance fit. The spring seat is threaded to the outer end of the through hole, and the pressure spring is clamped between the pin and the spring seat.

[0016] As a further preferred embodiment, an annular groove is provided on the outer edge of the limiting sleeve, and the positioning screw is screwed in and locked in the annular groove to facilitate axial positioning of the long rod.

[0017] As a further preferred option, a button is fixedly connected to the other end of the long rod to facilitate pressing the long rod.

[0018] The beneficial effects of this invention are:

[0019] 1. Because multiple elastic pins are evenly distributed around the outer edge of the positioning block on the fixing plate of the valve cover, the positioning block is inserted into the corresponding elastic pin through the positioning hole when it rotates. A long rod is inserted inside the handle rod, one end of which passes through the connecting rod and the positioning hole, and the other end passes through the adjusting nut and is connected to the limit sleeve. Therefore, the reversing handle can achieve automatic positioning when it is manually controlled. Pressing the button pushes the elastic pin out of the positioning hole through the long rod, which can control the handle rod to swing freely. The valve rod is driven to move axially to change direction through the positioning block, connecting rod, cam and limit pin. After swinging to the predetermined position, releasing the button allows the valve to be inserted into the corresponding elastic pin through the positioning hole to achieve automatic positioning. When the reversing valve needs to maintain a certain switching state, there is no need to manually support the handle, which is convenient to operate and reduces the workload of the operator.

[0020] 2. By screwing in the radially positioned locating screw on the adjusting nut and pressing it onto the limiting sleeve, one end of the long rod extends out of the locating hole. Therefore, when the directional valve is electrically controlled, the handle can achieve the 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 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

[0022] Figure 1 This is a schematic diagram of the structure of the present invention.

[0023] Figure 2 yes Figure 1 The right view.

[0024] Figure 3 yes Figure 1 AA sectional view.

[0025] Figure 4 yes Figure 2 BB cross-sectional view.

[0026] Figure 5 yes Figure 2 CC section view.

[0027] In the diagram: Valve cover 001, valve stem 002, connecting screw 003, button 101, limit sleeve 102, nut 103, positioning screw 104, adjusting nut 105, handle rod 106, long rod 107, locking nut 108, positioning block 109, fixing plate 110, pin 111, pressure spring 112, spring seat 113, positioning hole 114, pressure cap 201, sealing ring 202, set screw 203, connecting rod 204, cam 301, limit post 302. Detailed Implementation

[0028] 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.

[0029] like Figures 1-5As shown, the present invention relates to a positioning and reversing handle for a hydraulic directional valve, comprising a valve cover 001, a handle rod 106, and a valve rod 002. The valve cover 001 is fixed to one side of the valve body of the hydraulic directional valve by four connecting screws 003, and the valve rod 002 is inserted into the valve cover 001. A rotatable connecting rod 204 is installed inside the valve cover 001, and a cam 301 is provided on the connecting rod 204 inside the valve cover 001. The arc-shaped protrusion at the outer end of the cam 301 engages with a limiting post 302 connected to one end of the valve rod 002, for driving the valve rod 002 to move axially to achieve reversing.

[0030] A stepped mounting hole is provided on the valve cover 001. The connecting rod 204 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 201 is threadedly connected to the outer port of the mounting hole and sleeved on the connecting rod 204 to achieve axial positioning of the connecting rod 204. Sealing rings 202 are provided between the inner hole of the pressure cap 201 and the connecting rod 204, and between the outer edge of the pressure cap 201 and the valve cover 001, respectively, to prevent leakage of hydraulic oil inside the valve cover 001.

[0031] One end of the limiting post 302 is threadedly connected to the valve stem 002, and the other end of the limiting post 302 is provided with a U-shaped groove and is inserted into the protrusion of the cam 301 through a clearance fit. The center hole of the cam 301 is square, and the shaft segment on the connecting rod 204 corresponding to the mounting of the cam 301 is square prism and is inserted into the center hole of the cam 301.

[0032] A positioning block 109 is fixed on the connecting rod 204 at the outer end of the valve cover 001. The center hole of the positioning block 109 is square, and the outer end of the connecting rod 204 is square prism and is inserted into the center hole of the positioning block 109 through clearance fit. The upper half of the outer edge of the positioning block 109 is trapezoidal and the lower half is arc-shaped, and it is fixed to the connecting rod 204 by two symmetrically arranged set screws 203.

[0033] The positioning block 109 has a positioning hole 114 that is perpendicularly connected to its center hole. One end of the handle rod 106 is threadedly connected to the positioning hole 114 along the radial direction of the connecting rod 204 and locked by a locking nut 108 threadedly connected to the handle rod 106, which is used to drive the positioning block 109 and the connecting rod 204 to rotate. A fixing plate 110 is fixed to the valve cover 001 on one side of the positioning block 109 by screws 004. A U-shaped groove is provided on the fixing plate 110, and the positioning block 109 is embedded in the U-shaped groove.

[0034] Multiple elastic pins are evenly distributed around the outer edge of the positioning block 109 on the fixed plate 110. When the positioning block 109 rotates, it is inserted into the corresponding elastic pin through the positioning hole 114 to realize the reversing positioning of the valve stem 002. This embodiment takes three elastic pins as an example.

[0035] The elastic pin includes a pin 111, a pressure spring 112, and a spring seat 113. The pin 111 is inserted into a through hole provided on the fixing plate 110 through clearance fit. The spring seat 113 is threaded to the outer end of the through hole. The pressure spring 112 is clamped between the pin 111 and the spring seat 113.

[0036] An adjusting nut 105 is threadedly connected to the outer end of the handle rod 106, and a long rod 107 is inserted through the handle rod 106 with clearance fit. One end of the long rod 107 passes through the through hole and positioning hole 114 on the connecting rod 204, and the other end passes through the adjusting nut 105 and is threadedly connected to a limiting sleeve 102. The limiting sleeve 102 and the adjusting nut 105 are inserted with clearance fit. A positioning screw 104 is screwed radially into the adjusting nut 105, and a nut 103 is provided on the positioning screw 104 to achieve axial positioning of the long rod 107, so that the large end of the long rod 107 extends out of the positioning hole 114, allowing the handle rod 106 to swing freely, so as to realize the electric control of the valve rod 002.

[0037] An annular groove is provided on the outer edge of the limiting sleeve 102. After the positioning screw 104 is screwed in, it is locked in the annular groove to facilitate axial positioning of the long rod 107. A button 101 is fixedly connected to the other end of the long rod 107 by a thread to facilitate pressing the long rod 107.

[0038] During operation, first press button 101 to its limit position. The long rod 107 pushes the elastic pin out of the positioning hole 114. Then, push the handle rod 106 to drive the positioning block 109, connecting rod 204, and cam 301 to rotate around its center. Cam 301 pushes the limit pin 302 to move horizontally, thereby driving the valve stem 002 to move horizontally within the valve body to achieve the purpose of reversing. When the valve stem 002 moves the predetermined stroke, release button 101. At this time, the positioning hole 114 on the positioning block 109 is aligned with a through hole on the fixing plate 110. The pin 111 inside the fixing plate 110 moves into the positioning hole 114 under the thrust of the pressure spring 112 and pushes the long rod 107 upward together, thereby lifting the long rod 107 and button 101.

[0039] When the hydraulic directional valve is electrically controlled, automatic positioning is not required. Press button 101 to the limit position and hold it. Screw the positioning screw 104 into the annular groove of the limit sleeve 102 and turn the nut to lock it, thereby limiting the up-and-down movement of the limit sleeve 102 and thus limiting the movement of the long rod 107. At this time, the large end of the lower end of the long rod 107 extends out of the positioning hole 114 and pushes out the elastic pin. In this state, the directional handle has no positioning function and can swing freely, thus avoiding affecting 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 positioning and reversing handle for a hydraulic directional valve, comprising a valve cover, a handle rod, and a valve stem, characterized in that: in A rotatable connecting rod is installed inside the valve cover. A cam is located on the connecting rod inside the valve cover. The protrusion at the outer end 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. A positioning block is fixed on the connecting rod at the outer end of the valve cover. The handle rod is radially connected to the positioning hole on the positioning block 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. Multiple elastic pins are evenly distributed around the outer edge of the positioning block on the fixing plate. When the positioning block rotates, it is inserted into the corresponding elastic pin through the positioning hole to realize the reversing positioning of the valve rod. An adjusting nut is connected to the outer 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 passes through the adjusting nut and is connected to a limit sleeve. The limit sleeve is inserted into the adjusting nut. A positioning screw is provided on the adjusting nut in the radial direction to realize the axial positioning of the long rod, so that one end of the long rod extends out of the positioning hole to realize the electric control of the valve rod.

2. A positioning and reversing handle for a hydraulic directional valve according to claim 1, 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.

3. A positioning and reversing handle for a hydraulic directional valve according to claim 1, 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.

4. A positioning and reversing handle for a hydraulic directional valve according to claim 1 or 3, 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.

5. A positioning and reversing handle for a hydraulic directional valve according to claim 4, 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.

6. A positioning and reversing handle for a hydraulic directional valve according to claim 1 or 5, 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.

7. A positioning and reversing handle for a hydraulic directional valve according to claim 6, characterized in that: A U-shaped groove is provided on the fixing plate. The upper half of the outer edge of the positioning block is trapezoidal and the lower half is arc-shaped, and the positioning block is embedded in the U-shaped groove.

8. A positioning and reversing handle for a hydraulic directional valve according to claim 1, characterized in that: The elastic pin includes a pin, a pressure spring, and a spring seat. The pin is inserted into a through hole on the fixing plate with clearance fit. The spring seat is threaded to the outer end of the through hole. The pressure spring is clamped between the pin and the spring seat.

9. A positioning and reversing handle for a hydraulic directional valve according to claim 1, characterized in that: An annular groove is provided on the outer edge of the limiting sleeve. After the positioning screw is screwed in, it is locked in the annular groove to facilitate the axial positioning of the long rod.

10. A positioning and reversing handle for a hydraulic directional valve according to claim 1, characterized in that: A button is fixedly connected to the other end of the long rod so that the long rod can be pressed.

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