Positioning reversing handle for hydraulic reversing valve

Abstract

A 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, a cam is arranged on the connecting rod and located in the valve cover, and a protruding head at the outer end of the cam is connected with a limiting column connected to one end of the valve rod in a clamped mode; a positioning block is fixed at the outer end of the valve cover on the connecting rod; the handle rod is connected in a positioning hole formed in the positioning block along the radial direction of the connecting rod; a fixing plate is arranged on the valve cover and located on one side of the positioning block, a plurality of elastic pin shafts are evenly distributed on the fixing plate around the outer edge of the positioning block, and the positioning block is connected with the corresponding elastic pin shafts in an inserted mode through the positioning holes when rotating. An adjusting nut is connected to the outer end of the handle rod, a long rod is arranged in the handle rod in a penetrating mode, one end of the long rod penetrates through the connecting rod and the positioning hole, the other end of the long rod penetrates through the adjusting nut and is connected with a limiting sleeve, the limiting sleeve is connected with the adjusting nut in an inserted mode, and a positioning screw is arranged on the adjusting nut in the radial direction. The reversing handle has a positioning function, does not need to be manually supported and is convenient to operate.

Description

Technical Field

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

[0002] A hydraulic reversing valve is a directional control valve with two or more flow patterns and two or more oil ports. It enables communication, shutoff, and reversing of hydraulic oil circuits, as well as pressure unloading and sequential control. The hydraulic reversing valve relies on the relative movement of the valve stem and valve body to switch the oil circuit. The reversing handle controls the horizontal reciprocating movement of the valve stem within the reversing valve, thereby changing the flow direction of the pressurized oil within the hydraulic reversing valve.

[0003] The current hydraulic reversing handles generally adopt a lever structure, which is stable and labor-saving in reversing, but cannot remain fixed after reversing. When the hydraulic valve needs to be maintained in a certain reversing state, the handle needs to be manually supported by the operator, which is very inconvenient. Moreover, long-term manual support will increase the operator's workload. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a positioning reversing handle for a hydraulic reversing valve which has a positioning function, does not require manual support and is easy to operate.

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

[0006] A positioning and reversing handle for a hydraulic reversing valve comprises a valve housing, a handle rod and a valve stem. The special feature is that a rotatable connecting rod is mounted in the valve housing, a cam is provided on the connecting rod within the valve housing, and a protrusion at the outer end of the cam engages with a limit post connected to one end of the valve stem to drive the valve stem to move axially to achieve reversal.

[0007] A positioning block is fixed on the connecting rod at the outer end of the valve cover, and the handle rod is connected to the positioning hole provided on the positioning block along the radial direction of the connecting rod, 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 plurality of elastic pins are evenly distributed on the fixing plate around the outer edge of the positioning block. When the positioning block rotates, it is plugged into the corresponding elastic pins through the positioning holes to realize the reversing positioning of the valve stem;

[0008] An adjusting nut is connected to the outer end of the handle rod, and a long rod is passed through 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 limiting sleeve. The limiting sleeve is plugged into the adjusting nut. A positioning screw is provided radially on the adjusting nut, and an annular groove is provided on the outer edge of the limiting sleeve. After the positioning screw is screwed in, it is stuck in the annular groove to realize axial positioning of the long rod, so that one end of the long rod extends out of the positioning hole to realize electrical control of the valve stem.

[0009] A button is fixedly connected to the other end of the long rod to facilitate pressing the long rod.

[0010] As a further preference, the center 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 center hole of the cam.

[0011] As a further preference, 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 limitation of the connecting rod.

[0012] 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.

[0013] 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.

[0014] As a further preference, 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 preference, the elastic pin includes a pin, a pressure spring and a spring seat, the pin is inserted into a through hole set in the fixed plate through clearance fit, the spring seat is connected to the outer end of the through hole through a thread, and the pressure spring is clamped between the pin and the spring seat.

[0016] 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.

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

[0018] 1. Since a plurality of 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 connected with the corresponding elastic pin through the positioning hole when it rotates, and a long rod is passed through 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 the limiting sleeve. Therefore, the reversing handle can realize automatic positioning function when manually controlled. By pressing the button, the elastic pin is pushed out of the positioning hole through the long rod, and the handle rod can be controlled to swing freely, and the valve stem is driven to move axially and reverse through the positioning block, connecting rod, cam and limit column. After swinging to the predetermined position, the button is released to connect with the corresponding elastic pin through the positioning hole to realize automatic positioning. When the reversing valve needs to maintain a certain switching state, there is no need to manually support the handle, which is easy to operate and reduces the operator's workload.

[0019] 2. By screwing in the radially arranged positioning screw on the adjusting nut and pressing it onto the limit sleeve, one end of the long rod is extended out of the positioning hole. Therefore, when the reversing valve adopts electric control, the handle can realize the closed positioning function. 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 positioning function can be turned on and off at will, which is simple and convenient to operate, and can work stably in extreme environments such as severe vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the present utility model.

[0022] Figure 2 yes Figure 1 Right view of .

[0023] Figure 3 yes Figure 1 AA cross-sectional view.

[0024] Figure 4 yes Figure 2 BB cross-sectional view.

[0025] Figure 5 yes Figure 2 CC cross-sectional view.

[0026] In the figure: 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 cover 201, sealing ring 202, top screw 203, connecting rod 204, cam 301, limit column 302. DETAILED DESCRIPTION

[0027] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] like Figures 1 to 5As shown, the present invention relates to a positioning and reversing handle for a hydraulic reversing valve, comprising a valve housing 001, a handle rod 106, and a valve stem 002. The valve housing 001 is fixed to one side of the valve body of the hydraulic reversing valve via four connecting screws 003, and the valve stem 002 is inserted into the valve housing 001. A rotatable connecting rod 204 is mounted within the valve housing 001. A cam 301 is provided on the connecting rod 204 within the valve housing 001. The arc-shaped protrusion at the outer end of the cam 301 engages with a limit post 302 connected to one end of the valve stem 002, thereby driving the valve stem 002 to move axially for reversing.

[0029] The valve housing 001 is provided with a stepped mounting hole. The connecting rod 204 is in the shape of a stepped shaft, and its inner end is inserted into the inner end of the mounting hole through a clearance fit. A gland 201, which is sleeved on the connecting rod 204, is threadedly connected to the outer end of the mounting hole to achieve axial positioning of the connecting rod 204. Seal rings 202 are respectively provided between the inner hole of the gland 201 and the connecting rod 204, and between the outer edge of the gland 201 and the valve housing 001 to prevent leakage of hydraulic oil in the valve housing 001.

[0030] One end of the limiting post 302 is threadedly connected to the valve stem 002, and the other end of the limiting post 302 has a U-shaped groove that is inserted through a clearance fit with the protruding head of the cam 301. The center hole of the cam 301 is square, and the shaft section of the connecting rod 204 corresponding to the mounting of the cam 301 is square and inserted into the center hole of the cam 301.

[0031] 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. The outer end of the connecting rod 204 is a square column and is plugged 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 is fixed to the connecting rod 204 by two symmetrically arranged top screws 203.

[0032] The positioning block 109 is provided with 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 is locked by a lock nut 108 threaded onto the handle rod 106, which is used to drive the rotation of the positioning block 109 and the connecting rod 204. A fixing plate 110 is fixed to the valve cover 001 on one side of the positioning block 109 by screws 004. The fixing plate 110 has a U-shaped groove, and the positioning block 109 is inserted into the U-shaped groove.

[0033] A plurality of elastic pins are evenly distributed around the outer edge of the positioning block 109 on the fixing plate 110. When the positioning block 109 rotates, it engages with the corresponding elastic pins through the positioning holes 114 to achieve the reversing positioning of the valve stem 002. This embodiment takes three elastic pins as an example.

[0034] 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 fixed plate 110 through clearance fit. The spring seat 113 is connected to the outer end of the through hole through a thread. The pressure spring 112 is clamped between the pin 111 and the spring seat 113.

[0035] An adjusting nut 105 is connected to the outer end of the handle rod 106 through a thread, and a long rod 107 is passed through the handle rod 106 through a clearance fit. One end of the long rod 107 passes through the through hole and the positioning hole 114 on the connecting rod 204, and the other end passes through the adjusting nut 105 and is connected to the limiting sleeve 102 through a thread. The limiting sleeve 102 and the adjusting nut 105 are plugged in through a clearance fit, and a positioning screw 104 is radially screwed into the adjusting nut 105. A nut 103 is provided on the positioning screw 104 for realizing axial positioning of the long rod 107, so that the big head of one end of the long rod 107 extends out of the positioning hole 114, so that the handle rod 106 can swing arbitrarily to realize electrical control of the valve stem 002.

[0036] An annular groove is provided on the outer edge of the limiting sleeve 102, and the positioning screw 104 is screwed in and stuck 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.

[0037] During operation, the button 101 is first pressed to the limit position, and the long rod 107 is used to push the elastic pin out of the positioning hole 114. Then, the handle rod 106 is pushed to drive the positioning block 109, the connecting rod 204 and the cam 301 to rotate around their center. The cam 301 pushes the limit column 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 a predetermined stroke, the button 101 is released. At this time, the positioning hole 114 on the positioning block 109 is opposite to a through hole on the fixed plate 110. The pin 111 in the fixed plate 110 moves into the positioning hole 114 under the thrust of the pressure spring 112 and pushes the long rod 107 upward, thereby causing the long rod 107 and the button 101 to pop up.

[0038] When the hydraulic reversing valve is electronically controlled and the automatic positioning function is not required, the button 101 is pressed to the limit position and held, the positioning screw 104 is screwed into the annular groove of the limiting sleeve 102, and the nut is turned to tighten it to limit the upward and downward movement of the limiting sleeve 102, thereby 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, pushing the elastic pin out. In this state, the reversing handle has no positioning function and can swing freely, thereby avoiding affecting the control of the solenoid valve.

[0039] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with this field, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A positioning reversing handle for a hydraulic reversing valve, comprising a valve cover, a handle rod and a valve stem, characterized in that: A rotatable connecting rod is installed in the valve cover, and a cam is provided on the connecting rod inside the valve cover. The convex head at the outer end of the cam is engaged with the limit column connected to one end of the valve stem to drive the axial movement of the valve stem to achieve reversing; A positioning block is fixed on the connecting rod at the outer end of the valve cover, and the handle rod is connected to the positioning hole provided on the positioning block along the radial direction of the connecting rod, 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 plurality of elastic pins are evenly distributed on the fixing plate around the outer edge of the positioning block. When the positioning block rotates, it is plugged into the corresponding elastic pins through the positioning holes to realize the reversing positioning of the valve stem; An adjusting nut is connected to the outer end of the handle rod, and a long rod is passed through 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 limiting sleeve. The limiting sleeve is plugged into the adjusting nut. A positioning screw is provided radially on the adjusting nut, and an annular groove is provided on the outer edge of the limiting sleeve. After the positioning screw is screwed in, it is stuck in the annular groove to realize axial positioning of the long rod, so that one end of the long rod extends out of the positioning hole to realize electrical control of the valve stem. A button is fixedly connected to the other end of the long rod to facilitate pressing the long rod.

2. A positioning and reversing handle for a hydraulic reversing valve according to claim 1, characterized in that: The center 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 center hole of the cam.

3. A positioning reversing handle for a hydraulic reversing valve according to claim 1 or 2, characterized in that: 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 end of the mounting hole to achieve axial limitation of the connecting rod.

4. The positioning and reversing handle for a hydraulic reversing valve according to claim 3, 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.

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

6. The positioning and reversing handle for a hydraulic reversing valve according to claim 5, 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.

7. The positioning and reversing handle for a hydraulic reversing 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 set in the fixed plate through clearance fit. The spring seat is connected to the outer end of the through hole through a thread. The pressure spring is clamped between the pin and the spring seat.

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

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