A reversing valve with a switching function between steel ball positioning and spring reset for the reversing position

Abstract

The present invention discloses a reversing valve capable of switching between steel ball positioning and spring resetting at the reversing position, which includes a valve body, a reversing control mechanism and a switching mechanism. The reversing control mechanism includes a conversion rear cover, a return spring, a plug, a positioning sleeve, a steel ball and a steel ball seat, and a threaded through hole is machined at the rear end of the conversion rear cover; the switching mechanism includes an adjusting screw and a displacement conversion pad, and a strip-shaped hole is provided in the middle of the displacement conversion pad, and the adjusting screw passes through the strip-shaped hole and is threadedly connected to the threaded through hole; wherein, the displacement conversion pad is a gasket with a stepped outer end face, and the displacement conversion pad has a high gasket end and a low gasket end. In the reversing valve of the present invention, by providing a displacement conversion pad with a high gasket end and a low gasket end, the stroke range of the plug is changed, and further the reversing valve realizes two strokes at one reversing position, and freely switches between the two strokes through a simple mechanical structure, realizing the function of spring resetting or steel ball positioning at one reversing working position.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic valves, and particularly to a reversing valve whose reversing position can be switched between ball positioning and spring resetting. Background Art

[0002] Wheel tractors are widely used in various regions. In the northern regions, customers generally require a lifting with positioning function during deep tillage operations. In the southern regions, many customers with rotary tillers need a very sensitive fine movement function, and at this time, the positioning brings difficulties to the accuracy of the operation for customers.

[0003] However, the reversing control mechanism of the existing multi-way reversing valve can only achieve one of spring resetting or ball positioning, and cannot meet the usage requirements under various working conditions. Therefore, it is necessary to realize the switching between lifting positioning and non-positioning in the control of the configured hydraulic multi-way valve to meet the usage needs of customers in different regions. Summary of the Invention

[0004] To overcome the defects of the existing technology, the purpose of the present invention is to provide a reversing valve whose reversing position can be switched between ball positioning and spring resetting, realizing the free switching of a set of mechanisms between two control modes and solving the problem that spring resetting and ball positioning cannot coexist.

[0005] For this purpose, the present invention provides a reversing valve whose reversing position can be switched between ball positioning and spring resetting, including a valve body, a reversing control mechanism, and a switching mechanism. The reversing control mechanism includes a conversion rear cover, a return spring, a plug, a positioning sleeve, a ball, and a ball seat. A threaded through hole is machined at the rear end of the conversion rear cover. The switching mechanism includes an adjusting screw and a displacement conversion pad. A strip hole is provided in the middle of the displacement conversion pad, and the adjusting screw passes through the strip hole and is threadedly connected to the threaded through hole. Among them, the displacement conversion pad is a gasket with a stepped outer end face, and the displacement conversion pad has a high gasket end and a low gasket end.

[0006] When the adjusting screw cooperates with the high gasket end, the front end of the adjusting screw does not contact the plug, so that the ball can move into the positioning groove of the positioning sleeve, and the valve core cooperating with the plug is in the locked position. When the adjusting screw cooperates with the low gasket end, the front end of the adjusting screw presses against the end of the plug, so that the ball cannot move into the positioning groove, and the valve core can move to the neutral position through the return spring.

[0007] Further, a stepped groove is provided at the outer end of the threaded through hole, and a sealing member is installed in the stepped groove. The adjusting screw sequentially passes through the displacement conversion pad, the sealing member and is threadedly connected to the threaded through hole.

[0008] Further, a flat gasket is provided between the displacement conversion pad and the sealing member.

[0009] The directional control valve provided by the present invention, which can switch between ball positioning and spring reset at the commutation position, changes the stroke range of the plug by setting a displacement conversion pad with a high gasket end and a low gasket end, further enabling the directional control valve to have two strokes at one commutation position, one stroke being ball positioning and the other stroke being spring reset. It can freely switch between the two strokes through a simple mechanical structure, realizing the function of spring reset or ball positioning at one commutation working position.

[0010] In addition to the purposes, features and advantages described above, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the drawings. Brief Description of the Drawings

[0011] The specification drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0012] Figure 1 is a schematic structural diagram of the multi-way directional control valve of the present invention;

[0013] Figure 2 is a structural diagram of the spool in the neutral position in the multi-way directional control valve of the present invention;

[0014] Figure 3 is a structural diagram of the displacement conversion pad in the multi-way directional control valve of the present invention;

[0015] Figure 4 is a structural diagram of the spool in the rising position with positioning in the multi-way directional control valve of the present invention;

[0016] Figure 5 is a structural diagram of the spool in the rising position without positioning in the multi-way directional control valve of the present invention;

[0017] Description of the Reference Numerals in the Drawings

[0018] 1. Adjusting screw; 2. Displacement conversion pad; 3. Flat gasket; 4. Seal; 5. Conversion rear cover; 6. Plug; 7. Ball; 8. Positioning sleeve; 9. Ball seat; 10. Switching mechanism; 20. Commutation control mechanism; 30. Valve body; 21. Strip-shaped hole; 22. Low gasket end; 23. High gasket end. Detailed Description of the Embodiments

[0019] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0020] As Figures 1 to 2As shown, the reversing valve of the present invention can switch the reversing position between steel ball positioning and spring reset, including a valve body 30, a reversing control mechanism 20 and a switching mechanism 10, wherein the switching mechanism 10 is installed at the outer end of the reversing control mechanism 20 for controlling the stroke range of the screw plug 6.

[0021] Specifically, the reversing control mechanism 20 includes a conversion rear cover 5, a return spring, a screw plug 6, a positioning sleeve 8, a steel ball 7 and a steel ball seat 9; the switching mechanism 10 is installed at the outer end of the conversion rear cover 5, the valve body 30 is connected to one side of the reversing control mechanism 20, and at the same time, one end of the positioning sleeve 8 is connected to the valve core in the valve body 30.

[0022] like Figure 2 As shown, the switching mechanism 10 includes an adjusting screw 1, a displacement conversion pad 2, a flat gasket 3 and a sealing member 4; a threaded through hole is processed at the rear end of the conversion rear cover 5, and the adjusting screw 1 is threadedly connected to the threaded through hole so that the front end of the adjusting screw 1 can extend into the cavity of the conversion rear cover 5.

[0023] The displacement conversion pad 2 is arranged at the outer end surface of the conversion rear cover 5, and the adjusting screw 1 passes through the displacement conversion pad 2 and is threadedly connected with the threaded through hole; Figure 3 As shown, the displacement conversion pad 2 is a pad with a stepped outer end surface, so that the displacement conversion pad 2 forms a high pad end 23 and a low pad end 22, and the displacement conversion pad 2 has a strip hole 21 in the middle.

[0024] like Figure 4 As shown, after the adjusting screw 1 passes through the strip hole 21 of the rear displacement conversion pad 2 and is threadedly connected with the threaded through hole, when the adjusting screw 1 can cooperate with the high gasket end 23, the front end of the adjusting screw 1 cannot extend into the cavity of the conversion rear cover 5, the adjusting screw 1 does not contact the screw plug 6, and the end of the screw plug 6 can contact the inner end surface of the conversion rear cover 5, and the steel ball 7 located between the screw plug 6, the steel ball seat 9, and the positioning sleeve 8 can be moved to the positioning groove of the positioning sleeve 8 to achieve the locking position, and the spring force cannot reset the valve core to the neutral position; the entire reversing valve has a positioning function to meet the need for a rising belt positioning function during deep plowing operations.

[0025] like Figure 5 As shown, when the adjusting screw 1 can cooperate with the low gasket end 22, the front end of the adjusting screw 1 can extend to a certain distance in the cavity of the conversion rear cover 5, and the front end of the adjusting screw 1 can support the end of the screw plug 6, so that the end of the screw plug 6 cannot contact the inner end surface of the conversion rear cover 5, and further prevent the steel ball 7 from moving into the positioning groove of the positioning sleeve 8, and the valve core position cannot be locked. The spring force will reset the valve core to the neutral position, meeting the requirement of the rotary tiller for a very sensitive micro-motion function.

[0026] In addition, the outer end of the threaded through hole has a stepped groove, in which a flat gasket 3 and a seal 4 are installed, and the adjusting screw 1 passes through the displacement conversion gasket 2, the flat gasket 3 and the seal 4 in sequence and is threadedly connected to the threaded through hole of the conversion rear cover 5. By providing the flat gasket 3 and the seal 4, the sealing performance of the conversion rear cover 5 can be increased, and at the same time, the connection of the adjusting screw 1 can be tightened to achieve a loosening effect.

[0027] In summary, the reversing valve of the present invention adopts one reversing position and two strokes, one stroke is steel ball positioning, and the other stroke is spring reset. Through a simple mechanical structure, it can switch freely between the two strokes, realizing the function of both spring reset and steel ball positioning in one reversing working position, and the spring reset and steel ball positioning can be switched freely.

[0028] With a positioning function, the positioning steel ball can fall into the positioning slot to achieve a locked position, preventing the spring force from resetting the valve core to the neutral position; after adjusting the position of the position conversion pad, the screw is extended to the inner end surface of the rear cover to limit the maximum displacement position of the valve core. At this time, the positioning steel ball can no longer fall into the positioning slot, and the valve core position cannot be locked. The spring force will reset the valve core to the neutral position.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A reversing valve capable of switching between ball positioning and spring resetting at the reversing position, characterized in that, it includes a valve body (30), a reversing control mechanism (20) and a switching mechanism (10), the reversing control mechanism (20) includes a conversion rear cover (5), a return spring, a plug (6), a positioning sleeve (8), a ball (7) and a ball seat (9), and a threaded through hole is machined at the rear end of the conversion rear cover (5); the switching mechanism (10) includes an adjusting screw (1) and a displacement conversion pad (2), a strip hole (21) is provided in the middle of the displacement conversion pad (2), and the adjusting screw (1) passes through the strip hole (21) and is threadedly connected to the threaded through hole; wherein, the displacement conversion pad (2) is a gasket with a stepped outer end face, and the displacement conversion pad (2) has a high gasket end (23) and a low gasket end (22), when the adjusting screw (1) cooperates with the high gasket end (23), the front end of the adjusting screw (1) does not contact the plug (6), so that the ball (7) can move into the positioning groove of the positioning sleeve (8), and the valve core cooperating with the plug (6) is in the locked position; when the adjusting screw (1) cooperates with the low gasket end (22), the front end of the adjusting screw (1) abuts against the end of the plug (6), so that the ball (7) cannot move into the positioning groove, and the valve core can move to the neutral position through the return spring.

2. The reversing valve capable of switching between ball positioning and spring resetting at the reversing position according to claim 1, characterized in that, a stepped groove is provided at the outer end of the threaded through hole, a seal (4) is installed in the stepped groove, and the adjusting screw (1) sequentially passes through the displacement conversion pad (2), the seal (4) and is threadedly connected to the threaded through hole.

3. The reversing valve capable of switching between ball positioning and spring resetting at the reversing position according to claim 2, characterized in that, a flat gasket (3) is provided between the displacement conversion pad (2) and the seal (4).

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