Reversing valve

Abstract

The invention relates to the technical field of hydraulic valves, in particular to a reversing valve. The reversing valve comprises a valve body and a valve element assembly, a first oil inlet, a second oil inlet, an oil port A and an oil port B are formed in the valve body in the axial direction at intervals, the oil port A is communicated with a rodless cavity of the hydraulic oil cylinder, and the oil port B is communicated with a rod cavity of the hydraulic oil cylinder. The valve element assembly comprises a main valve element and a sliding ring, and the sliding ring is arranged on the main valve element in a sleeving mode and can move in the axial direction of the main valve element so as to block the first oil inlet and the second oil inlet. The valve element assembly is arranged to be of a split structure of the main valve element and the sliding ring, the sliding ring moves in the axial direction of the main valve element to control switching of a hydraulic loop on the valve body, so that reversing operation of the hydraulic oil cylinder is controlled, axial movement displacement of the main valve element in the valve body is reduced, the axial length of the valve body is reduced, and the service life of the valve body is prolonged. Therefore, the size of the reversing valve and the installation space occupied by the reversing valve are reduced, and miniaturization of the reversing valve is achieved.

Description

Technical Field

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

[0002] The hydraulic cylinder is one of the main actuators of the hydraulic system. The reversing valve in the hydraulic system drives the valve core in the valve body through hydraulic oil to achieve position change, thereby controlling the reciprocating motion of the hydraulic cylinder.

[0003] The valve body of the reversing valve is provided with a plurality of oil ports, which are selectively connected to the oil supply pipeline, the oil return pipeline, the rod chamber and the rodless chamber of the hydraulic cylinder. The valve core is controlled to move in the valve body by manually toggling the reversing switch or electrically, thereby changing the hydraulic circuit in the reversing valve to realize the reciprocating motion of the hydraulic cylinder. During the reversing process, the displacement of the valve core along the valve body is relatively long, resulting in a larger size of the reversing valve, which requires more installation space and is not convenient for the installation and use of the reversing valve. Summary of the invention

[0004] The object of the present invention is to provide a reversing valve to reduce the volume and installation space of the reversing valve and realize a miniaturized design of the reversing valve.

[0005] To achieve this purpose, the technical solution adopted by the present invention is:

[0006] Directional valve, comprising:

[0007] A valve body, wherein the valve body is provided with a first oil inlet, a second oil inlet, an oil port A and an oil port B spaced apart in the axial direction, the oil port A can be communicated with the rodless chamber of the hydraulic cylinder, and the oil port B can be communicated with the rod chamber of the hydraulic cylinder;

[0008] The valve core assembly includes a main valve core and a slip ring. The main valve core is installed in the valve body and has a first switching position and a second switching position. The slip ring is sleeved on the main valve core and can move along the axial direction of the main valve core to block the first oil inlet or the second oil inlet.

[0009] As an optional solution for the reversing valve, a limiting groove is provided on the outer peripheral surface of the main valve core along its circumference, the slip ring is sleeved on the main valve core, and at least part of the slip ring is located in the limiting groove; when the main valve core is located in the first reversing position, the slip ring abuts against the first side wall of the limiting groove; when the main valve core is located in the second reversing position, the slip ring abuts against the second side wall of the limiting groove.

[0010] As an optional solution for the reversing valve, the first oil inlet and the second oil inlet are arranged adjacent to each other and located between the oil port A and the oil port B, the first oil inlet is close to the oil port B, and the second oil inlet is close to the oil port A.

[0011] As an optional solution for the reversing valve, the main valve core includes a first sliding valve core and a second sliding valve core connected to each other, the second sliding valve core includes a first core shaft and a second core shaft connected to each other in a stepped axis, the diameter of the first core shaft is smaller than the diameter of the second core shaft, one end of the first sliding valve core is connected to an end of the first core shaft away from the second core shaft, so that the limit groove is formed between the first sliding valve core and the second core shaft.

[0012] As an optional solution for the reversing valve, the valve body is further provided with an oil return port T along the axial direction. When the main valve core is located at the first reversing position, the second oil inlet is connected to the oil port A, the slip ring blocks the first oil inlet, and the oil port B is connected to the oil return port T; when the main valve core is located at the second reversing position, the slip ring blocks the second oil inlet, the first oil inlet is connected to the oil port B, and the oil port A is connected to the oil return port T.

[0013] As an optional solution for the reversing valve, the oil return port T includes a first oil return port and a second oil return port arranged at intervals, the first oil return port is arranged adjacent to the oil port B, and the second oil return port is arranged adjacent to the oil port A;

[0014] The first sliding valve core has a left shoulder, and the second sliding valve core has a right shoulder. When the main valve core is located at the first switching position, the first oil return port is connected with the oil port B, and the right shoulder blocks the second oil return port; when the main valve core is located at the second switching position, the second oil return port is connected with the oil port A, and the left shoulder blocks the first oil return port.

[0015] As an optional solution for the reversing valve, the valve body includes a connected valve seat and a valve sleeve, and an accommodating groove for accommodating the valve core assembly is axially opened in the valve sleeve, and the accommodating groove is connected to at least one axial end of the valve sleeve.

[0016] As an optional solution of the reversing valve, the inner wall of the valve sleeve is provided with a stopper, and the stopper can move along the radial direction of the valve body;

[0017] The main valve core is provided with a reversing shoulder. When the main valve core is located at the first reversing position, the stop portion presses against the first side surface of the reversing shoulder; when the main valve core is located at the second reversing position, the stop portion presses against the second side surface of the reversing shoulder.

[0018] As an optional solution for the reversing valve, the main valve core and the valve body enclose a first pilot cavity, an annular cavity and a second pilot cavity which are sequentially arranged in the axial direction, the slip ring separates the annular cavity into a first annular cavity and a second annular cavity, the first pilot cavity is communicated with the second annular cavity, and the second pilot cavity is communicated with the first annular cavity;

[0019] When the main valve core is located at the first switching position, the second oil inlet, the second annular cavity and the oil port A are connected in sequence, and the oil port B, the first annular cavity and the oil return port T of the valve body are connected in sequence; when the main valve core is located at the second switching position, the oil port A, the second annular cavity and the oil return port T are connected in sequence; the first oil inlet, the first annular cavity and the oil port B are connected in sequence.

[0020] As an optional solution for the reversing valve, a first flow channel and a second flow channel are opened in the main valve core, the first pilot cavity, the first flow channel and the second annular cavity are connected in sequence, and the second pilot cavity, the second flow channel and the first annular cavity are connected in sequence.

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

[0022] The reversing valve proposed in the present invention arranges the valve core assembly into a split structure of a main valve core and a slip ring, and the slip ring moves on the left and right sides of the axial direction of the main valve core to control the switching of the hydraulic circuit on the valve body, thereby controlling the reversing operation of the hydraulic cylinder, reducing the axial movement displacement of the main valve core in the valve body, reducing the axial length of the valve body, thereby reducing the volume of the reversing valve and the required installation space, and realizing the miniaturization of the reversing valve. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0025] Figure 3 is a cross-sectional view of a main valve core provided by an embodiment of the present invention;

[0026] Figure 4 is a schematic diagram of the structural decomposition of the valve core assembly provided by an embodiment of the present invention;

[0027] Figure 5 It is a schematic diagram of the structural decomposition of the valve body provided by an embodiment of the present invention.

[0028] The names and numbers of the components in the figure are as follows:

[0029] 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;

[0030] 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;

[0031] 3. Stopper; 4. Holding ring. DETAILED DESCRIPTION

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0037] This embodiment proposes a reversing valve, which is mainly used for the reversing operation of a hydraulic oil cylinder. Specifically, the cylinder body of the hydraulic oil cylinder has a rodless chamber and a rod chamber, and the reversing valve is installed on the cylinder body to adjust the oil volume in the rodless chamber and the rod chamber through the reversing valve, thereby controlling the piston rod of the hydraulic oil cylinder to extend or retract into the cylinder body to complete the reciprocating motion of the hydraulic oil cylinder (i.e., reversing operation).

[0038] The valve body of the existing reversing valve is provided with multiple oil ports, which are selectively connected to the oil supply pipeline, the oil return pipeline, the rod chamber and the rodless chamber of the hydraulic cylinder. The valve core is controlled to move in the valve body by manually toggling the reversing switch or electrically, thereby changing the hydraulic circuit in the reversing valve to achieve the reciprocating motion of the hydraulic cylinder. During the reversing process, the displacement of the valve core along the valve body is long, resulting in a larger size of the reversing valve, which requires more installation space and is inconvenient for the installation and use of the reversing valve.

[0039] To solve the above problems, Figure 1 and Figure 2 As shown, the reversing valve of this embodiment includes a valve body 1 and a valve core assembly 2. The valve body 1 is provided with an oil return port T, a first oil inlet port 122, a second oil inlet port 123, an oil port A126 and an oil port B127 spaced apart in the axial direction. The oil port A126 can be communicated with the rodless cavity of the hydraulic cylinder, and the oil port B127 can be communicated with the rod cavity of the hydraulic cylinder. The valve core assembly 2 includes a main valve core 21 and a slip ring 22. The main valve core 21 is installed in the valve body 1 and has a first reversing position and a second reversing position. 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 main valve core 21 is located in the first switching position, the second oil inlet 123 is connected with the oil port A126, the slip ring 22 moves toward one side of the axial direction of the main valve core 21 and blocks the first oil inlet 122, and the oil port B127 is connected with the oil return port T; when the main valve core 21 is located in the second switching position, the slip ring 22 moves toward the other side of the axial direction of the main valve core 21 and blocks the second oil inlet 123, the first oil inlet 122 is connected with the oil port B127, and the oil port A126 is connected with the oil return port T.

[0040] When the main valve core 21 is located in the first switching position, the oil pressure at the second oil inlet 123 drives the slip ring 22 to move toward the axial left side of the main valve core 21 and blocks the first oil inlet 122, and the oil port B127 is connected with the oil return port T, so that the piston rod of the hydraulic cylinder moves along one side of the axial direction of the valve body 1; when the main valve core 21 is located in the second switching position, the slip ring 22 moves toward the axial right side of the main valve core 21 and blocks the second oil inlet 123, the first oil inlet 122 is connected with the oil port B127, and the oil port A126 is connected with the oil return port T, so that the piston rod of the hydraulic cylinder moves along the other side of the axial direction of the valve body 1, thereby realizing the reciprocating movement of the hydraulic cylinder. By setting the valve core assembly 2 into a split structure of a main valve core 21 and a slip ring 22, the slip ring 22 moves along the left and right sides of the main valve core 21 in the axial direction to control the switching of the hydraulic circuit on the valve body 1, thereby controlling the reversing operation of the hydraulic cylinder, reducing the axial movement displacement of the main valve core 21 in the valve body 1, reducing the axial length of the valve body 1, thereby reducing the volume of the reversing valve and the required installation space, thereby realizing the miniaturization of the reversing valve.

[0041] It should be noted that both the first oil inlet 122 and the second oil inlet 123 are connected to an external oil supply pipe so that high-pressure hydraulic oil can be input to the two oil inlets through an oil pump or other mechanism. The return oil 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 when the two oil inlets are filled with oil is much greater than the oil pressure at the return oil port T. 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 sliding ring 22 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 sliding ring 22 from left to right to the second oil inlet 123 and block the second oil inlet 123.

[0042] The slip ring 22 and the main valve core 21 in this embodiment are of a split structure. 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 distance between the two oil inlets, thereby avoiding the main valve core 21 from moving a large displacement when the distance between the two oil inlets is large, further reducing the axial space of the valve body 1, thereby reducing the volume of the reversing valve and the required installation space.

[0043] like Figure 3 and Figure 4 As shown, the outer peripheral surface of the main valve core 21 is provided with a limiting groove 210 along its circumference, and the slip ring 22 is sleeved in the limiting groove 210. When the main valve core 21 is located at the first switching position, the slip ring 22 abuts against the first side wall ( Figure 1When the main valve core 21 is in the second switching position, the slip ring 22 abuts against the second side wall of the limiting groove 210 ( Figure 1 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.

[0044] Specifically, the main valve core 21 includes a valve cover 211, a first sliding valve core 212 and a second sliding valve core 213 connected to each other. The second sliding valve core 213 includes a first core shaft and a second core shaft connected to each other in a stepped shaft. The diameter of the first core shaft is smaller than the diameter of the second core shaft. One end of the first sliding valve core 212 is connected to an end of the first core shaft away from the second core shaft, so that a limiting groove 210 is formed between the first sliding valve core 212 and the second core shaft. The right end face of the first sliding valve core 212 of this embodiment is the first side wall of the limiting groove 210, and the stepped surface between the first core shaft and the second core shaft is the second side wall of the limiting groove 210. The slip ring 22 is sleeved on the first core shaft and can abut against the right end face of the first sliding valve core 212 or the stepped surface between the first core shaft and the second core shaft. The valve cover 211 is screwed and installed on the left end of the first sliding valve core 212 by means of threaded connection, and the right end of the first sliding valve core 212 can be connected to the second sliding valve core 213 as a whole by means of buckling, threaded connection or interference fit. By setting the main valve core 21 as a split structure, the disassembly and assembly operation of the main valve core 21 is facilitated, and the assembly efficiency and structural strength of the main valve core 21 are improved. It should be noted that when the first sliding valve core 212 and the second sliding valve core 213 are threadedly connected, the two are mutually sleeved and pressed. In order to improve the position of the two flow channels after connection, the first sliding valve core 212 / the second sliding valve core 213 can be provided with an annular groove as part of the flow channel. After the first sliding valve core 212 and the second sliding valve core 213 are connected, the flow channels inside the two are connected through the annular groove, which can reduce the difficulty of processing and improve adaptability.

[0045] like Figure 1 and Figure 2 As shown, the first oil inlet 122 and the second oil inlet 123 are arranged adjacent to each other and are located between the oil port A126 and the oil port B127, the first oil inlet 122 is close to the oil port B127, and the second oil inlet 123 is close to the oil port A126. By setting two oil inlets, the two oil inlets can be selectively opened and closed according to the switching requirements, thereby switching the hydraulic circuit in the reversing valve to deliver high-pressure hydraulic oil to the rodless chamber or the rod chamber. Since the first oil inlet 122 and the second oil inlet 123 are arranged adjacent to each other, the distance between the two oil inlets is small, and the compact distribution of the oil inlets is achieved. At the same time, the movement distance of the slip ring 22 along the axial direction of the main valve core 21 is prevented from being too long, and the size of the limit groove 210 is reduced, so that the structure of the valve core assembly 2 is more compact.

[0046] Furthermore, the oil return port T includes a first oil return port 124 and a second oil return port 125 which are 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. The first sliding valve core 212 has a left stop shoulder 2124, and the second sliding valve core 213 has a right stop shoulder 2133. When the main valve core 21 is located at the first reversing position, the first oil return port 124 is connected to the oil port B127, and the right stop shoulder 2133 blocks the second oil return port 125; when the main valve core 21 is located at the second reversing position, the second oil return port 125 is connected to the oil port A126, and the left stop shoulder 2124 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 connected to the respective adjacent oil return ports, thereby optimizing the oil port distribution in the reversing valve. At the same time, the first oil return port 124 is blocked by the left stop shoulder 2124 of the first sliding valve core 212, and the second oil return port 125 is blocked by the right stop shoulder 2133 of the second sliding valve core 213, so as to ensure that the two oil return ports are opened and closed reliably.

[0047] like Figure 1 , Figure 2 and Figure 5 As shown, the valve body 1 includes a valve seat 11 and a valve sleeve 12 connected to each other, and a receiving groove for receiving the valve core assembly 2 is axially provided in the valve sleeve 12, and the receiving groove is communicated with at least one axial end of the valve sleeve 12. Specifically, the receiving groove is communicated with both axial ends of the valve sleeve 12, so that the valve core assembly 2 can be installed into the valve sleeve 12 laterally along the axial direction of the valve sleeve 12, thereby realizing rapid assembly of the valve core assembly 2.

[0048] like Figure 1 and Figure 2 As shown, the inner wall of the valve body 1 is provided with a stopper, which can move along the radial direction of the valve body 1 to apply an axial force to the valve core assembly 2. The main valve core 21 is provided with a reversing shoulder 2123. When the main valve core 21 moves between the first reversing position and the second reversing position, the reversing shoulder 2123 pushes the stopper to retract the inner wall of the valve body 1; when the main valve core 21 is located at the first reversing position, the stopper presses against the first side surface 21232 of the reversing shoulder 2123; when the main valve core 21 is located at the second reversing position, the stopper presses against the second side surface 21231 of the reversing shoulder 2123. By setting the stopper, the reversing valve has a set reversing pressure. Since the stopper is installed at a circumferential position in the valve body 1, it does not need to occupy the axial (left and right direction in the figure) space of the valve body 1, which reduces the axial length of the valve body 1, and further reduces the volume of the reversing valve and the required installation space.

[0049] In this embodiment, the main valve core 21 and the valve body 1 enclose a first pilot chamber 13, an annular chamber, and a second pilot chamber 16 which are arranged in sequence along the axial direction. The sliding ring 22 separates the annular chamber into a first annular chamber 14 and a second annular chamber 15. The first pilot chamber 13 is connected to the second annular chamber 15, and the second pilot chamber 16 is connected to the first annular chamber 14. When the main valve core 21 is located at the first reversing position, the second oil inlet 123, the second annular chamber 15 and the oil port A126 are connected in sequence, and the oil port B127 and the first annular chamber 14 are connected in sequence to the oil return port T; when the main valve core 21 is located at the second reversing position, the oil port A126, the second annular chamber 15 and the oil return port T are connected in sequence; the first oil inlet 122, the first annular chamber 14 and the oil port B127 are connected in sequence.

[0050] Specifically, the stopper comprises a stopper 3 and a holding ring 4. 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 along 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 tightly. When the main valve core 21 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 main valve core 21 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 valve sleeve 12 of the valve body 1. 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 main valve core 21 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 valve body 1 again. When the stopper 3 slides to the right side of the reversing shoulder 2123, the oil pressure in the second pilot chamber 16 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 first side surface 21232 of the reversing shoulder 2123, and repeats this cycle.

[0051] In this embodiment, the second side surface 21231 of the reversing stop shoulder 2123 is connected to the first side surface 21232 at an angle, so that the reversing stop shoulder 2123 is a V-shaped stop shoulder. The second side surface 21231 of the reversing stop shoulder 2123 is inclined to the first side surface 21232, so that 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, avoid the stopper 3 and the reversing stop shoulder 2123 from getting stuck, etc., thereby realizing the automatic reversing operation of the reversing valve. Specifically, the reversing stop 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 to the 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. 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 in the shape of an arc.

[0052] like Figure 3 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 reversing valve, the reversing shoulder 2123 is easily stuck with the stop member 3, causing the valve core assembly 2 to be locked in the first reversing position or the second reversing position, causing the reversing valve to fail or be damaged. When the angle α is too large (greater than 150°), the slope of the inclined second side 21231 and the first side 21232 is relatively small, thereby reducing the limiting effect of the stop member 3 on the reversing shoulder 2123, thereby reducing the switching pressure.

[0053] For ease of understanding, the detailed reversing operation of the reversing valve is as follows: Figure 1As 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 second oil inlet 123 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 (first oil return port 124), 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 2 As 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 first oil inlet 122 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 (the second oil return port 125), 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 reversing valve.

[0054] In this embodiment, 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 reversing valve is simplified.

[0055] Specifically, Figure 1 to Figure 4As shown, a reversing shoulder 2123 is provided 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.

[0056] 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, and 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. 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 sliding ring 22 is the first annular cavity 14, the cavity between the sliding ring 22 and the right shoulder 2133 is the second annular cavity 15, and the cavity surrounded by the right end of the second sliding valve core 213 and the valve sleeve 12 is the second pilot cavity 16. 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.

[0057] A plurality of through holes 120 are provided at intervals along the circumferential direction at the first end of the valve sleeve 12, and the through holes 120 are communicated with the interior of the valve sleeve 12. A plurality of stoppers 3 are movably installed in the corresponding through holes 120 and can be telescopically moved 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.

[0058] Furthermore, the outer circumferential surface of the first end of the valve sleeve 12 is provided with a mounting groove 121 in the circumferential direction, and the bottom wall of the mounting groove 121 is provided with a plurality of through holes 120, and the holding ring 4 is elastically sleeved in the mounting groove 121. The mounting groove 121 is used to accommodate and install the holding ring 4, so that the holding ring 4 can be quickly installed on the valve sleeve 12, improving the installation accuracy of the holding ring 4, and at the same time ensuring that the holding ring 4 can hold all the stoppers 3 tightly, avoiding the position displacement of the holding ring 4 during the elastic contraction or expansion process.

[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. Directional reversing valve, characterized in that: include: A valve body (1), wherein the valve body (1) is provided with a first oil inlet (122), a second oil inlet (123), an oil port A (126) and an oil port B (127) spaced apart in the axial direction, the oil port A (126) being capable of communicating with a rodless chamber of a hydraulic cylinder, and the oil port B (127) being capable of communicating with a rod chamber of the hydraulic cylinder; A valve core assembly (2) comprises a main valve core (21) and a slip ring (22); the main valve core (21) is installed in the valve body (1) and has a first switching position and a second switching position; 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) to block the first oil inlet (122) or the second oil inlet (123).

2. The reversing valve according to claim 1, characterized in that: The outer peripheral surface of the main valve core (21) is provided with a limiting groove (210) along its circumference; the slip ring (22) is sleeved on the main valve core (21), and at least a portion of the slip ring (22) is located in the limiting groove (210); when the main valve core (21) is located in the first switching position, the slip ring (22) abuts against a first side wall of the limiting groove (210); when the main valve core (21) is located in the second switching position, the slip ring (22) abuts against a second side wall of the limiting groove (210).

3. The reversing valve according to claim 2, characterized in that: The first oil inlet (122) and the second oil inlet (123) are arranged adjacent to each other and are located between the oil port A (126) and the oil port B (127), wherein the first oil inlet (122) is close to the oil port B (127) and the second oil inlet (123) is close to the oil port A (126).

4. The reversing valve according to claim 2, characterized in that: The main valve core (21) includes a first sliding valve core (212) and a second sliding valve core (213) connected to each other, and the second sliding valve core (213) includes a first core shaft and a second core shaft connected to each other in a stepped axis, the diameter of the first core shaft is smaller than the diameter of the second core shaft, and one end of the first sliding valve core (212) is connected to an end of the first core shaft away from the second core shaft, so that the limiting groove (210) is formed between the first sliding valve core (212) and the second core shaft.

5. The reversing valve according to claim 4, characterized in that: The valve body (1) is also provided with an oil return port T along the axial direction. When the main valve core (21) is located at the first reversing position, the second oil inlet port (123) is communicated with the oil port A (126), the slip ring (22) blocks the first oil inlet port (122), and the oil port B (127) is communicated with the oil return port T; when the main valve core (21) is located at the second reversing position, the slip ring (22) blocks the second oil inlet port (123), the first oil inlet port (122) is communicated with the oil port B (127), and the oil port A (126) is communicated with the oil return port T.

6. The reversing valve according to claim 5, characterized in that: The oil return port T comprises a first oil return port (124) and a second oil return port (125) which are arranged at intervals, wherein the first oil return port (124) is arranged adjacent to the oil port B (127), and the second oil return port (125) is arranged adjacent to the oil port A (126); The first sliding valve core (212) has a left stop shoulder (2124), and the second sliding valve core (213) has a right stop shoulder (2133). When the main valve core (21) is located at the first switching position, the first oil return port (124) is connected to the oil port B (127), and the right stop shoulder (2133) blocks the second oil return port (125); when the main valve core (21) is located at the second switching position, the second oil return port (125) is connected to the oil port A (126), and the left stop shoulder (2124) blocks the first oil return port (124).

7. The reversing valve according to any one of claims 1 to 6, characterized in that: The valve body (1) comprises a valve seat (11) and a valve sleeve (12) which are connected to each other. A receiving groove for receiving the valve core assembly (2) is axially provided in the valve sleeve (12). The receiving groove is in communication with at least one axial end of the valve sleeve (12).

8. The reversing valve according to claim 7, characterized in that: The inner wall of the valve sleeve (12) is provided with a stopper, and the stopper can move along the radial direction of the valve body (1); The main valve core (21) is provided with a reversing stop shoulder (2123). When the main valve core (21) is located at the first reversing position, the stop portion presses against the first side surface (21232) of the reversing stop shoulder (2123); when the main valve core (21) is located at the second reversing position, the stop portion presses against the second side surface (21231) of the reversing stop shoulder (2123).

9. The reversing valve according to claim 8, characterized in that: The main valve core (21) and the valve body (1) enclose a first pilot chamber (13), an annular chamber, and a second pilot chamber (16) which are arranged in sequence along the axial direction; the slip ring (22) separates the annular chamber into a first annular chamber (14) and a second annular chamber (15); the first pilot chamber (13) is in communication with the second annular chamber (15), and the second pilot chamber (16) is in communication with the first annular chamber (14); When the main valve core (21) is located at the first reversing position, the second oil inlet (123), the second annular cavity (15) and the oil port A (126) are connected in sequence, and the oil port B (127), the first annular cavity (14) and the oil return port T of the valve body (1) are connected in sequence; when the main valve core (21) is located at the second reversing position, the oil port A (126), the second annular cavity (15) and the oil return port T are connected in sequence; the first oil inlet (122), the first annular cavity (14) and the oil port B (127) are connected in sequence.

10. The reversing valve according to claim 9, characterized in that: The main valve core (21) is provided with a first flow channel and a second flow channel, the first pilot cavity (13), the first flow channel and the second annular cavity (15) are connected in sequence, and the second pilot cavity (16), the second flow channel and the first annular cavity (14) are connected in sequence.

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