Automatic switching valve

Abstract

The invention relates to the technical field of hydraulic valves, in particular to an automatic switching valve. The automatic switching valve comprises a valve body and a valve element assembly, a reversing piece is elastically installed in the valve body, and the reversing piece can act in the radial direction of the valve body so as to apply axial acting force to the valve element assembly. The valve element assembly is installed in the valve body and provided with a first reversing position and a second reversing position. The valve element assembly is provided with a reversing stop shoulder, and when the valve element assembly is located at the first reversing position, the reversing piece abuts against the first side face of the reversing stop shoulder. When the valve element assembly is located at the second reversing position, the reversing piece abuts against the second side face of the reversing stop shoulder, and the first side face and the second side face are arranged oppositely. The reversing piece is installed at the circumferential position in the valve body, the axial length of the valve body is reduced, and therefore the size and the installation space of the automatic switching valve are reduced, and miniaturization of the automatic switching valve is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic valves, and in particular to an automatic switching valve. Background Art

[0002] Traditional hydraulic cylinders need to use an automatic switching valve (also called a reversing valve) with a sliding valve structure to achieve reciprocating motion. The existing automatic switching valve uses hydraulic oil to drive the internal sliding valve core to achieve position change, thereby controlling the reciprocating motion of the hydraulic cylinder. In the valve body of the automatic switching valve, a spring is usually installed at the end of the sliding valve core to provide a reversing pressure for the sliding valve core. Since the installation space for the spring needs to be reserved in the valve body of the automatic switching valve, the size of the valve body is increased, resulting in a larger volume of the automatic switching valve, which requires more installation space and is inconvenient for the installation and use of the automatic switching valve. Summary of the invention

[0003] The object of the present invention is to provide an automatic switching valve to reduce the volume and installation space of the automatic switching valve and realize a miniaturized design of the automatic switching valve.

[0004] To achieve this purpose, the technical solution adopted by the present invention is:

[0005] An automatic switching valve comprises a valve body and a valve core assembly, wherein a reversing member is elastically mounted in the valve body, and the reversing member can move in the radial direction of the valve body to apply an axial force to the valve core assembly;

[0006] The valve core assembly is installed in the valve body, and the valve core assembly has a first reversing position and a second reversing position; the valve core assembly has a reversing shoulder, and when the valve core assembly is located at the first reversing position, the reversing member presses against the first side surface of the reversing shoulder; when the valve core assembly is located at the second reversing position, the reversing member presses against the second side surface of the reversing shoulder, and the first side surface is arranged opposite to the second side surface.

[0007] As an optional scheme for the automatic switching valve, the reversing shoulder includes a connecting end and a free end, and along the radial direction of the valve core assembly, the free end protrudes toward a side away from the axis of the valve core assembly relative to the connecting end; along the axial direction of the valve core assembly, the first side surface and the second side surface are respectively located on both sides of the free end, and the reversing member can move from the connecting end to the free end along the first side surface, or the reversing member can move from the free end to the connecting end along the second side surface.

[0008] As an optional solution of the automatic switching valve, the first side surface is connected to the second side surface at an angle; or the first side surface is smoothly connected to the second side surface to form an arc surface;

[0009] An accommodating groove is arranged in the valve body. When the reversing member abuts against the first side surface or the second side surface, at least a part of the reversing member is located in the accommodating groove, and the reversing shoulder can push the reversing member to retract into the accommodating groove.

[0010] As an optional solution for the automatic switching valve, the reversing member includes a stopper and a holding ring, the stopper is movably mounted on the inner wall of the valve body, and the stopper can move radially along the valve body, and the holding ring is elastically sleeved on the valve body and holds the stopper tightly;

[0011] When the valve core assembly is located at the first reversing position, the stopper presses against the first side surface; when the valve core assembly is located at the second reversing position, the stopper presses against the second side surface.

[0012] As an optional solution for the automatic switching valve, the stopper is a sphere.

[0013] As an optional solution of the automatic switching valve, the valve body includes a valve seat and a valve sleeve, the valve sleeve is connected to the valve seat, and the valve core assembly is installed in the valve sleeve;

[0014] The valve sleeve is provided with a receiving groove in a radial direction, and the stopper is movably installed in the receiving groove and can move in a radial direction of the valve sleeve so that the stopper protrudes from the inner wall of the valve sleeve and presses against the first side surface or the second side surface of the switching shoulder.

[0015] As an optional solution for the automatic switching valve, the accommodating groove includes a connected mounting groove and a through hole, the mounting groove is circumferentially arranged on the outer circumferential surface of the valve sleeve, the through hole is radially opened on the bottom wall of the mounting groove, the holding ring is elastically sleeved in the mounting groove, and the stopper is movably installed in the through hole; when the valve core assembly is located in the first switching position or the second switching position, one side of the stopper abuts against the first side surface or the second side surface, the other side of the stopper abuts against the holding ring, and the holding ring abuts against the bottom of the mounting groove or has a gap.

[0016] As an optional solution for the automatic switching valve, the valve body is provided with an oil return port T, an oil inlet port P, an oil port A and an oil port B at intervals along the axial direction, the oil port A can be communicated with the rodless chamber of the actuator, and the oil port B can be communicated with the rod chamber of the actuator; the valve core assembly and the valve body enclose a first pilot chamber, a first annular chamber, a second annular chamber and a second pilot chamber which are arranged in sequence along the axial direction at intervals, the first pilot chamber is communicated with the second annular chamber, and the second pilot chamber is communicated with the first annular chamber; the reversing shoulder is located in the first pilot chamber;

[0017] When the valve core assembly is located at the first reversing position, the oil inlet P is connected to the oil port A, and the oil port B is connected to the oil return port T; when the valve core assembly is located at the second reversing position, the oil inlet P is connected to the oil port B, and the oil port A is connected to the oil return port T.

[0018] As an optional solution for the automatic switching valve, the oil inlet P includes a first oil inlet and a second oil inlet arranged at intervals, the first oil inlet is arranged adjacent to the oil port B, and the second oil inlet is arranged adjacent to the oil port A;

[0019] The valve core assembly includes a main valve core and a slip ring, wherein the slip ring is sleeved on the main valve core and can move axially along the main valve core; when the valve core assembly is located at the first reversing position, the slip ring blocks the first oil inlet, and the second oil inlet is connected to the oil port A; when the valve core assembly is located at the second reversing position, the slip ring blocks the second oil inlet, and the first oil inlet is connected to the oil port B.

[0020] As an optional solution for the automatic switching valve, a limiting groove is provided on the outer peripheral surface of the main valve core in the circumferential direction, and the slip ring is arranged in the limiting groove; when the valve core assembly is located at the first switching position, the slip ring abuts against the first side wall of the limiting groove; when the valve core assembly is located at the second switching position, the slip ring abuts against the second side wall of the limiting groove.

[0021] The beneficial effects of the present invention are:

[0022] The automatic switching valve proposed by the present invention controls the switching of the automatic switching valve by applying an axial force to the valve core assembly through the radial movement of the switching member along the valve body. Since the switching member moves along the radial direction of the valve body, it does not need to occupy the axial space of the valve body, and the axial length of the valve body is reduced, thereby reducing the volume of the automatic switching valve and the installation space required, and realizing the miniaturization of the automatic switching valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a cross-sectional view of an automatic switching valve in a first switching position provided by an embodiment of the present invention;

[0024] Figure 2 is a cross-sectional view of an automatic switching valve in a second switching position provided by an embodiment of the present invention;

[0025] Figure 3 is a structural anatomical view of a valve body provided by an embodiment of the present invention;

[0026] Figure 4 It is a structural exploded sectional view of a main valve core provided by an embodiment of the present invention.

[0027] The names and numbers of the components in the figure are as follows:

[0028] 1. Valve body; 11. Valve seat; 12. Valve sleeve; 120. Through hole; 121. Mounting groove; 122. First oil inlet; 123. Second oil inlet; 124. First oil return port; 125. Second oil return port; 126. Oil port A; 127. Oil port B; 13. First pilot chamber; 14. First annular chamber; 15. Second annular chamber; 16. Second pilot chamber;

[0029] 2. Valve core assembly; 21. Main valve core; 210. Limiting groove; 211. Valve cover; 2111. First channel; 212. First sliding valve core; 2121. Second channel; 2122. Third channel; 2123. Reversing shoulder; 21231. Second side; 21232. First side; 21233. Connecting end; 21234. Free end; 2124. Left shoulder; 213. Second sliding valve core; 2131. Fourth channel; 2132. Fifth channel; 2133. Right shoulder; 22. Slip ring;

[0030] 3. Stopper; 4. Holding ring. DETAILED DESCRIPTION

[0031] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, not all.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0036] This embodiment proposes a dynamic switching valve, which is mainly used to control the switching operation of the hydraulic cylinder. Specifically, the cylinder body of the hydraulic cylinder has a rodless chamber and a rod chamber, and the automatic switching valve is installed on the cylinder body to adjust the oil volume (i.e., hydraulic oil) in the rodless chamber and the rod chamber through the automatic switching valve, thereby controlling the piston rod of the hydraulic cylinder to extend or retract into the cylinder body to complete the reciprocating motion of the hydraulic cylinder.

[0037] The existing automatic switching valve uses hydraulic oil to drive the internal sliding valve core to achieve position change, thereby controlling the reciprocating motion of the hydraulic cylinder. In the valve body of the automatic switching valve, a spring is installed at one or both ends of the axial direction of the sliding valve core to control the switching pressure of the sliding valve core through the spring. Since the installation space of the spring needs to be reserved in the valve body of the automatic switching valve, the axial length of the valve body is increased, resulting in a large volume of the automatic switching valve, which requires more installation space and is inconvenient for the installation and use of the automatic switching valve.

[0038] To solve the above problems, Figure 1 to Figure 4As shown, the automatic switching valve of this embodiment includes a valve body 1 and a valve core assembly 2. A reversing member is elastically installed in the valve body 1. The reversing member can move along the radial direction of the valve body 1 to apply an axial force to the valve core assembly 2. The valve core assembly 2 is installed in the valve body 1. The valve core assembly 2 has a first reversing position and a second reversing position. The valve core assembly 2 has a reversing shoulder 2123. When the valve core assembly 2 is located at the first reversing position, the reversing member presses against the first side surface 21232 of the reversing shoulder 2123; when the valve core assembly 2 is located at the second reversing position, the reversing member presses against the second side surface 21231 of the reversing shoulder 2123, and the first side surface 21232 is arranged opposite to the second side surface 21231. The reversing member moves along the radial direction of the valve body 1 to apply an axial force to the valve core assembly 2, thereby controlling the reversing of the automatic switching valve. Since the reversing member moves along the radial direction of the valve body 1, it does not need to occupy the axial space (left-right direction in the figure) of the valve body 1, thereby reducing the axial length of the valve body 1, thereby reducing the volume of the automatic switching valve and the required installation space, facilitating installation and use, and realizing the miniaturization of the automatic switching valve.

[0039] Specifically, the reversing member includes a stopper 3 and a holding ring 4. The inner wall of the valve body 1 is movably provided with a stopper 3, and the stopper 3 can move in the radial direction of the valve body 1. The holding ring 4 is elastically sleeved on the valve body 1 and holds the stopper 3. In this embodiment, the inner wall of the valve body 1 is provided with a plurality of stoppers 3 at intervals along the circumferential direction, and the stoppers 3 can move in the radial direction of the valve body 1. The holding ring 4 is elastically sleeved in the valve body 1 and holds the plurality of stoppers 3. The valve core assembly 2 is installed in the valve body 1 and has a first reversing position moved to the left end of the valve body 1 and a second reversing position moved to the right end of the valve body 1. The valve body 1 has a receiving groove. When the valve core assembly 2 moves between the first reversing position and the second reversing position, the reversing stop shoulder 2123 pushes the stopper 3 to retract into the receiving groove of the valve body 1. When the valve core assembly 2 is located at the first reversing position, the stopper 3 presses against the first side surface 21232 of the reversing stop shoulder 2123. When the valve core assembly 2 is located at the second switching position, the stopper 3 presses against the second side surface 21231 of the switching shoulder 2123 to limit the switching of the automatic switching valve.

[0040] In this embodiment, the stopper 3 is a sphere, so that the stopper 3 and the reversing shoulder 2123 are in point contact, which reduces the contact area between the stopper 3 and the reversing shoulder 2123, thereby reducing the wear of the reversing shoulder 2123 and improving the protection of the valve core assembly 2. The stopper 3 is a steel ball, which has high structural strength and wear resistance to improve the service life of the stopper 3. The holding ring 4 is a steel wire retaining ring, which has high structural strength and can hold multiple steel balls tightly, so as to press the second side 21231 or the first side 21232 of the reversing shoulder 2123 through the steel balls, thereby controlling the reversing pressure of the automatic switching valve. Of course, the material, diameter and other parameters of the holding ring 4 can be adjusted according to different reversing pressures.

[0041] like Figure 3 As shown, the valve body 1 is provided with an oil return port T, an oil inlet port P, an oil port A126 and an oil port B127 at intervals along the axial direction. The oil port A126 can be communicated with the rodless chamber of the actuator, and the oil port B127 can be communicated with the rod chamber of the actuator. The valve core assembly 2 and the valve body 1 enclose a first pilot chamber 13, a first annular chamber 14, a second annular chamber 15 and a second pilot chamber 16 which are arranged in sequence along the axial direction. The first pilot chamber 13 is communicated with the second annular chamber 15, and the second pilot chamber 16 is communicated with the first annular chamber 14. The reversing shoulder 2123 is located in the first pilot chamber 13. As shown in FIG. Figure 1 As shown, when the valve core assembly 2 is located at the first switching position, the oil inlet P is connected to the oil port A126, and the oil port B127 is connected to the oil return port T. Figure 2 As shown, when the valve core assembly 2 is located at the second switching position, the oil inlet P is connected to the oil port B127, and the oil port A126 is connected to the oil return port T. The actuator of this embodiment is a hydraulic cylinder.

[0042] It should be noted that the oil inlet P is connected to an external oil supply pipe so that high-pressure hydraulic oil can be input to the oil inlet P through an oil pump or other mechanism. The oil return port T is connected to an external oil tank so that the hydraulic oil can flow back into the oil tank, and the oil pressure at the oil inlet P when the oil is input is much greater than the oil pressure at the oil return port T.

[0043] along Figure 1 As shown by the arrow, when the valve core assembly 2 is in the first reversing position, a portion of the external high-pressure hydraulic oil flows into the rodless chamber through the oil inlet P and the oil port A126, and the other portion of the hydraulic oil flows into the first pilot chamber 13 on the left. The hydraulic oil in the rod chamber flows back to the oil tank through the oil port B127 and the oil return port T, thereby causing the piston rod in the cylinder to move from left to right. When the piston rod moves to the right to the extreme position, the oil pressure in the first pilot chamber 13 continues to increase until the stopper 3 can be pushed into the inner wall of the valve body 1, the ring 4 expands, and the reversing shoulder 2123 moves from the left side of the stopper 3 to the right side. At this time, the stopper 3 is pressed against the second side 21231 of the reversing shoulder 2123 by the elastic restoring force of the ring 4. Along Figure 2As shown by the arrow, when the valve core assembly 2 is in the second reversing position, part of the external high-pressure hydraulic oil flows into the rod chamber through the oil inlet P and the oil port B127, and the other part of the hydraulic oil flows into the second pilot chamber 16 on the right side. The hydraulic oil in the rodless chamber flows back to the oil tank through the oil port A126 and the oil return port T, so that the piston rod in the cylinder body moves from right to left. When the piston rod moves to the left to the limit position, the oil pressure in the second pilot chamber 16 continues to increase until the stopper 3 can be pushed into the inner wall of the valve body 1, the ring 4 expands again, and the reversing shoulder 2123 moves from the right side of the stopper 3 to the left side. At this time, the stopper 3 is pressed against the first side surface 21232 of the reversing shoulder 2123 under the action of the elastic restoring force of the ring 4, and the cycle is repeated in sequence, thereby controlling the reciprocating motion of the hydraulic cylinder through the automatic switching valve.

[0044] Specifically, Figure 3 As shown, the oil inlet P includes a first oil inlet 122 and a second oil inlet 123 arranged at intervals, the first oil inlet 122 is arranged adjacent to the oil port B127, and the second oil inlet 123 is arranged adjacent to the oil port A126. The valve core assembly 2 includes a main valve core 21 and a slip ring 22, the slip ring 22 is sleeved on the main valve core 21 and can move along the axial direction of the main valve core 21. When the valve core assembly 2 is located at the first reversing position, the slip ring 22 moves toward the axial left side of the main valve core 21 and blocks the first oil inlet 122, and the second oil inlet 123 is connected to the oil port A126. When the valve core assembly 2 is located at the second reversing position, the slip ring 22 moves toward the axial right side of the main valve core 21 and blocks the second oil inlet 123, and the first oil inlet 122 is connected to the oil port B127. By setting two oil inlets, the two oil inlets can be selectively opened and closed according to the switching requirements, and can be connected with the oil port A126 and the oil port B127 to deliver high-pressure hydraulic oil to the rodless chamber or the rod chamber.

[0045] It should be noted that when the valve core assembly 2 is located at the first reversing position, the second oil inlet 123 is connected to the oil port A126, so that the high-pressure hydraulic oil entering the second oil inlet 123 can push the slip ring 22 to move from right to left to the first oil inlet 122 and block the first oil inlet 122. When the valve core assembly 2 is located at the second reversing position, the first oil inlet 122 is connected to the oil port B127, so that the high-pressure hydraulic oil entering the first oil inlet 122 can push the slip ring 22 to move from left to right to the second oil inlet 123 and block the second oil inlet 123. Compared with the design scheme in which the slip ring 22 and the main valve core 21 are an integral structure, the slip ring 22 and the main valve core 21 in this embodiment are a split structure, so that the main valve core 21 and the slip ring 22 can move independently in the axial direction, so that the moving length of the main valve core 21 between the first switching position and the second switching position will not be limited by the axial spacing between the first oil inlet 122 and the second oil inlet 123 along the valve body 1, thereby avoiding the valve core assembly 2 from moving a large displacement when switching when the spacing between the first oil inlet 122 and the second oil inlet 123 is large, which is beneficial to further reduce the axial space of the valve body 1, thereby further reducing the volume of the automatic switching valve and the required installation space.

[0046] Furthermore, if Figure 1 and Figure 2 The outer peripheral surface of the main valve core 21 is provided with a limiting groove 210 along the circumferential direction, and the slip ring 22 is sleeved in the limiting groove 210. When the valve core assembly 2 is located at the first reversing position, the slip ring 22 abuts against the first side wall of the limiting groove 210. When the valve core assembly 2 is located at the second reversing position, the slip ring 22 abuts against the second side wall of the limiting groove 210. By providing the limiting groove 210, the sliding of the slip ring 22 in the left and right directions can be limited, so that the slip ring 22 stays on the first side wall or the second side wall of the limiting groove 210, so that the slip ring 22 can reliably block the first oil inlet 122 or the second oil inlet 123.

[0047] like Figure 1 to Figure 3As shown, the oil return port T includes a first oil return port 124 and a second oil return port 125 arranged at intervals, the first oil return port 124 is arranged adjacent to the oil port B127, and the second oil return port 125 is arranged adjacent to the oil port A126. When the valve core assembly 2 is located at the first reversing position, the first oil return port 124 is communicated with the oil port B127, and the valve core assembly 2 blocks the second oil return port 125; when the valve core assembly 2 is located at the second reversing position, the second oil return port 125 is communicated with the oil port A126, and the valve core assembly 2 blocks the first oil return port 124. By setting two oil return ports, the oil port A126 and the oil port B127 can be selectively communicated with their respective adjacent oil return ports, thereby optimizing the oil port distribution in the automatic switching valve. At the same time, a left shoulder 2124 and a right shoulder 2133 are provided at the left and right ends of the main valve core 21. The first oil return port 124 is blocked by the left shoulder 2124 of the main valve core 21, and the second oil return port 125 is blocked by the right shoulder 2133 of the main valve core 21 to ensure that the two oil return ports are opened and closed reliably.

[0048] like Figure 1 and Figure 2 As shown, the main valve core 21 is provided with a first flow channel and a second flow channel, the first pilot chamber 13, the first flow channel and the second annular chamber 15 are sequentially connected, and the second pilot chamber 16, the second flow channel and the first annular chamber 14 are sequentially connected. By providing two flow channels in the main valve core 21, part of the high-pressure hydraulic oil flows to the first pilot chamber 13 through the first flow channel or flows to the second pilot chamber 16 through the second flow channel, the layout of the hydraulic flow channels is optimized, and the structure of the automatic switching valve is simplified.

[0049] Specifically, Figure 1 , Figure 2 and Figure 4 As shown, the main valve core 21 includes a valve cover 211, a first sliding valve core 212 and a second sliding valve core 213 which are connected in sequence, and a reversing shoulder 2123 is arranged on the outer periphery of the first sliding valve core 212. The valve cover 211 is provided with a first channel 2111, the first sliding valve core 212 is provided with a second channel 2121 and a third channel 2122, and the second sliding valve core 213 is provided with a fourth channel 2131 and a fifth channel 2132. One end of the first channel 2111 is connected to the first pilot chamber 13, and one end of the fourth channel 2131 is connected to the second annular chamber 15. The other end of the first channel 2111, the second channel 2121 and the other end of the fourth channel 2131 are connected in sequence to form a first flow channel. One end of the third channel 2122 is connected to the first annular chamber 14, one end of the fifth channel 2132 is connected to the second pilot chamber 16, and the other end of the third channel 2122 is connected to the other end of the fifth channel 2132 to form a second flow channel. By configuring the main valve core 21 to be a three-part structure of the valve cover 211 , the first sliding valve core 212 and the second sliding valve core 213 , the main valve core 21 is easily disassembled and assembled, while the processing difficulty of the first flow channel and the second flow channel is reduced, thereby saving costs.

[0050] Specifically, the valve cover 211 is a T-shaped structure, and the valve cover 211 is screwed and installed on the left end of the first sliding valve core 212 by threaded connection. The right end of the first sliding valve core 212 and the second sliding valve core 213 can be connected as a whole by buckling, threaded connection or interference fit. The above assembly method not only improves the assembly efficiency of the main valve core 21, but also improves the structural strength of the main valve core 21. It should be noted that the right end of the first sliding valve core 212 can be coaxially provided with an annular groove with internal threads, and the left end of the second sliding valve core 213 is threadedly connected in the annular groove. The first sliding valve core 212 and the second sliding valve core 213 are coaxially and threadedly connected to ensure that the first channel 2111, the second channel 2121 and the fourth channel 2131 are connected in sequence to form a first flow channel, and the third channel 2122 and the fifth channel 2132 are connected to form a second flow channel.

[0051] In this embodiment, the outer periphery of the first sliding valve core 212 is provided with a reversing shoulder 2123 and a left shoulder 2124 at intervals along the axial direction, and the second sliding valve core 213 is provided with a right shoulder 2133 at one end (i.e., the right end) away from the first sliding valve core 212. The left end of the second sliding valve core 213 is a stepped shaft structure, the right end of the first sliding valve core 212 and the left end of the second sliding valve core 213 are assembled together to form a limiting groove 210, and the slip ring 22 is sleeved on the second sliding valve core 213 and can move left and right in the limiting groove 210. When the valve core assembly 2 is installed in the valve body 1, the left cavity of the left shoulder 2124 is the first pilot cavity 13, the cavity between the left shoulder 2124 and the slip ring 22 is the first ring cavity 14, the cavity between the slip ring 22 and the right shoulder 2133 is the second ring cavity 15, and the cavity enclosed by the right end of the second sliding valve core 213 and the valve sleeve 12 is the second pilot cavity 16.

[0052] It should be noted that the reversing shoulder 2123 is located in the first pilot chamber 13, and the reversing shoulder 2123 divides the first pilot chamber 13 into two mutually connected left and right parts. One end of the second channel 2121 in the first sliding valve core 212 is connected to the fourth channel 2131, and the other end of the second channel 2121 has two branch channels, one of which is connected to the first channel 2111 to transport part of the hydraulic oil to the left space of the first pilot chamber 13 through the first channel 2111, and the other branch channel is connected to the right space of the first pilot chamber 13 to ensure that the hydraulic oil is evenly injected into the first pilot chamber 13.

[0053] like Figure 1 to Figure 3As shown, the valve body 1 includes a valve seat 11 and a valve sleeve 12, and the valve sleeve 12 is connected to the valve seat 11. The valve core assembly 2 is installed in the valve sleeve 12. The valve sleeve 12 is provided with a receiving groove in the radial direction, and the stopper 3 is movably installed in the receiving groove and can move in the radial direction of the valve sleeve 12, so that the stopper 3 protrudes from the inner wall of the valve sleeve 12 and presses the first side surface 21232 or the second side surface 21231 of the switching shoulder 2123. By setting the valve body 1 as a split structure of the valve seat 11 and the valve sleeve 12, the processing and manufacturing of the valve body 1 is facilitated, and the processing difficulty of the valve body 1 is reduced.

[0054] Specifically, the accommodating groove includes a connecting mounting groove 121 and a through hole 120, the outer peripheral surface of the valve sleeve 12 is circumferentially provided with the mounting groove 121, the bottom wall of the mounting groove 121 is radially provided with a through hole 120, the holding ring 4 is elastically sleeved in the mounting groove 121, and the stopper 3 is movably installed in the through hole 120. When the valve core assembly 2 is located at the first reversing position or the second reversing position, one side of the stopper 3 abuts against the first side surface 21232 or the second side surface 21231, and the other side of the stopper 3 abuts against the holding ring 4, and the holding ring 4 abuts against the bottom of the mounting groove 121 or has a gap. Specifically, the valve sleeve 12 is provided with a plurality of through holes 120 spaced apart along the circumferential direction, the through holes 120 are communicated with the interior of the valve sleeve 12, and a plurality of stoppers 3 are movably installed in the corresponding through holes 120 and can telescope and move in the radial direction of the valve sleeve 12, so that the stoppers 3 protrude from the inner wall of the valve sleeve 12 and press against the reversing shoulder 2123 or retract into the corresponding through holes 120. The axial direction of the through holes 120 of this embodiment is parallel to the radial direction of the valve sleeve 12, so that the stoppers 3 can extend or retract along the through holes 120, providing a guiding and limiting function for the telescopic movement of the stoppers 3 in the radial direction of the valve sleeve 12.

[0055] When the valve core assembly 2 is located at the first switching position, the stopper 3 is pressed against the first side surface 21232 of the switching shoulder 2123, and the holding ring 4 applies an elastic clamping force to the stopper 3, so that the stopper 3 presses the first side surface 21232 of the switching shoulder 2123. When the oil pressure in the first pilot chamber 13 increases to a set value, the valve core assembly 2 moves from left to right under the push of the oil pressure. At this time, the switching shoulder 2123 pushes the stopper 3 into the through hole 120. When the stopper 3 slides to the left side of the switching shoulder 2123, the oil pressure in the first pilot chamber 13 drops. Under the action of the elastic clamping force of the holding ring 4, the stopper 3 protrudes out of the inner wall of the valve sleeve 12 again and presses against the second side surface 21231 of the switching shoulder 2123. At this time, the oil pressure in the second pilot chamber 16 will gradually increase to the set value, and the valve core assembly 2 will move from right to left under the push of the oil pressure. At this time, the reversing shoulder 2123 will push the stopper 3 into the through hole 120 again. When the stopper 3 slides to the right side of the reversing shoulder 2123, the oil pressure in the second pilot chamber 16 will drop. Under the action of the elastic clamping force of the holding ring 4, the stopper 3 will protrude from the inner wall of the valve sleeve 12 again and press against the first side surface 21232 of the reversing shoulder 2123. This reciprocating cycle realizes the automatic reversing operation of the automatic switching valve.

[0056] like Figure 1 , Figure 2 and Figure 4 As shown, the reversing shoulder 2123 includes a connecting end 21233 and a free end 21234. Along the radial direction of the valve core assembly 2, the free end 21234 protrudes relative to the connecting end 21233 toward a side away from the axis of the valve core assembly 2. Along the axial direction of the valve core assembly 2, the first side surface 21232 and the second side surface 21231 are respectively located on both sides of the free end 21234, and the reversing member can move from the connecting end 21233 to the free end 21234 along the first side surface 21232, or the reversing member can move from the free end 21234 to the connecting end 21233 along the second side surface 21231.

[0057] In this embodiment, the second side surface 21231 is connected to the first side surface 21232 at an angle, so that the reversing shoulder 2123 is a V-shaped shoulder. A receiving groove is provided in the valve body 1. When the reversing member abuts against the first side surface 21232 or the second side surface 21231, at least part of the reversing member is located in the receiving groove, and the reversing shoulder 2123 can push the reversing member to retract into the receiving groove. Since the second side surface 21231 and the first side surface 21232 of the reversing shoulder 2123 are inclined, the stopper 3 can slide back and forth between the second side surface 21231 and the first side surface 21232, so as to play a good guiding role for the stopper 3, and avoid the stopper 3 and the reversing shoulder 2123 from getting stuck, etc., thereby realizing the automatic reversing operation of the automatic switching valve. In other embodiments, the first side surface 21232 and the second side surface 21231 are smoothly connected to form an arc surface, that is, the radial cross section of the reversing shoulder 2123 is an arc shape.

[0058] like Figure 4 As shown, the angle α between the second side surface 21231 and the first side surface 21232 is 90° to 150°. For example, the angle α can be 90°, 100°, 110°, 120°, 130°, 140° or 150°, etc., to ensure that the stopper 3 switches positions back and forth between the second side surface 21231 and the first side surface 21232 of the reversing shoulder 2123. When the angle α is too small (less than 90°), the slope of the inclined second side 21231 and the first side 21232 is relatively large. During the switching process of the automatic switching valve, the switching shoulder 2123 is easily stuck with the stop member 3, causing the valve core assembly 2 to be locked in the first switching position or the second switching position, making the automatic switching valve invalid or damaged; when the angle α is too small (greater than 150°), the slope of the inclined second side 21231 and the first side 21232 is relatively small, which reduces the limiting effect of the stop member 3 on the switching shoulder 2123, thereby reducing the switching pressure.

[0059] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. Automatic switching valve, It is characterized in that It comprises a valve body (1) and a valve core assembly (2), wherein a reversing member is elastically mounted in the valve body (1), and the reversing member can move in the radial direction of the valve body (1) to exert an axial force on the valve core assembly (2); The valve core assembly (2) is installed in the valve body (1), and the valve core assembly (2) has a first reversing position and a second reversing position; the valve core assembly (2) has a reversing shoulder (2123), and when the valve core assembly (2) is located at the first reversing position, the reversing member presses against a first side surface (21232) of the reversing shoulder (2123); when the valve core assembly (2) is located at the second reversing position, the reversing member presses against a second side surface (21231) of the reversing shoulder (2123), and the first side surface (21232) and the second side surface (21231) are arranged opposite to each other.

2. The automatic switching valve according to claim 1, It is characterized in that The reversing shoulder (2123) includes a connecting end (21233) and a free end (21234). Along the radial direction of the valve core assembly (2), the free end (21234) protrudes toward a side away from the axis of the valve core assembly (2) relative to the connecting end (21233); along the axial direction of the valve core assembly (2), the first side surface (21232) and the second side surface (21231) are respectively located on both sides of the free end (21234), and the reversing member can move from the connecting end (21233) to the free end (21234) along the first side surface (21232), or the reversing member can move from the free end (21234) to the connecting end (21233) along the second side surface (21231).

3. The automatic switching valve according to claim 2, It is characterized in that The first side surface (21232) and the second side surface (21231) are connected at an angle; or, the first side surface (21232) and the second side surface (21231) are smoothly connected to form an arc surface; The valve body (1) is provided with a receiving groove, and when the reversing member abuts against the first side surface (21232) or the second side surface (21231), at least part of the reversing member is located in the receiving groove, and the reversing shoulder (2123) can push the reversing member to retract into the receiving groove.

4. The automatic switching valve according to claim 1, It is characterized in that The reversing member comprises a stopper (3) and a holding ring (4); the stopper (3) is movably mounted on the inner wall of the valve body (1), and the stopper (3) is capable of moving in the radial direction of the valve body (1); the holding ring (4) is elastically sleeved on the valve body (1) and holds the stopper (3); When the valve core assembly (2) is located at the first reversing position, the stopper (3) presses against the first side surface (21232); when the valve core assembly (2) is located at the second reversing position, the stopper (3) presses against the second side surface (21231).

5. The automatic switching valve according to claim 4, It is characterized in that The stopper (3) is a sphere.

6. The automatic switching valve according to claim 4, It is characterized in that The valve body (1) comprises a valve seat (11) and a valve sleeve (12), the valve sleeve (12) is connected to the valve seat (11), and the valve core assembly (2) is installed in the valve sleeve (12); The valve sleeve (12) is provided with a receiving groove extending radially therethrough, and the stopper (3) is movably mounted in the receiving groove and is capable of moving radially along the valve sleeve (12), so that the stopper (3) protrudes from the inner wall of the valve sleeve (12) and presses against the first side surface (21232) or the second side surface (21231) of the reversing shoulder (2123).

7. The automatic switching valve according to claim 6, It is characterized in that The accommodating groove comprises a connecting mounting groove (121) and a through hole (120); the mounting groove (121) is circumferentially arranged on the outer circumferential surface of the valve sleeve (12); the through hole (120) is radially opened on the bottom wall of the mounting groove (121); the holding ring (4) is elastically sleeved in the mounting groove (121); and the stopper (3) is movably installed in the through hole (120); when the valve core assembly (2) is located at the first reversing position or the second reversing position, one side of the stopper (3) abuts against the first side surface (21232) or the second side surface (21231), and the other side of the stopper (3) abuts against the holding ring (4); the holding ring (4) abuts against the bottom of the mounting groove (121) or has a gap therebetween.

8. The automatic switching valve according to any one of claims 1 to 7, It is characterized in that The valve body (1) is provided with an oil return port T, an oil inlet port P, an oil port A (126) and an oil port B (127) spaced apart in the axial direction; the oil port A (126) can be communicated with a rodless chamber of an actuator, and the oil port B (127) can be communicated with a rod chamber of the actuator; the valve core assembly (2) and the valve body (1) enclose a first pilot chamber (13), a first annular chamber (14), a second annular chamber (15) and a second pilot chamber (16) spaced apart in the axial direction in sequence; the first pilot chamber (13) is communicated with the second annular chamber (15), and the second pilot chamber (16) is communicated with the first annular chamber (14); the reversing shoulder (2123) is located in the first pilot chamber (13); When the valve core assembly (2) is located at the first reversing position, the oil inlet P is connected to the oil port A (126), and the oil port B (127) is connected to the oil return port T; when the valve core assembly (2) is located at the second reversing position, the oil inlet P is connected to the oil port B (127), and the oil port A (126) is connected to the oil return port T.

9. The automatic switching valve according to claim 8, It is characterized in that The oil inlet P comprises a first oil inlet (122) and a second oil inlet (123) which are arranged at intervals, the first oil inlet (122) being arranged adjacent to the oil port B (127), and the second oil inlet (123) being arranged adjacent to the oil port A (126); The valve core assembly (2) comprises a main valve core (21) and a slip ring (22), wherein the slip ring (22) is sleeved on the main valve core (21) and is capable of moving along the axial direction of the main valve core (21); when the valve core assembly (2) is located at the first reversing position, the slip ring (22) blocks the first oil inlet (122), and the second oil inlet (123) is connected to the oil port A (126); when the valve core assembly (2) is located at the second reversing position, the slip ring (22) blocks the second oil inlet (123), and the first oil inlet (122) is connected to the oil port B (127).

10. The automatic switching valve according to claim 9, It is characterized in that The outer peripheral surface of the main valve core (21) is provided with a limiting groove (210) along the circumferential direction, and the slip ring (22) is sleeved in the limiting groove (210); when the valve core assembly (2) is located at the first reversing position, the slip ring (22) abuts against the first side wall of the limiting groove (210); when the valve core assembly (2) is located at the second reversing position, the slip ring (22) abuts against the second side wall of the limiting groove (210).

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