Reversing valve

Abstract

The utility model 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 utility model relates to the technical field of hydraulic valves, 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 reversing valve body is equipped with multiple oil ports, which selectively connect to the oil supply and return lines, as well as the rod and rodless chambers of the hydraulic cylinder. The valve core is moved within the valve body by manually toggling a reversing switch or electrically, thereby altering the hydraulic circuit within the reversing valve and achieving reciprocating motion in the hydraulic cylinder. During the reversing process, the valve core moves a long distance along the valve body, resulting in a larger reversing valve, requiring more installation space and making it inconvenient to install and use. Utility Model Content

[0004] The purpose of the utility model is to provide a reversing valve to reduce the volume and installation space of the reversing valve and realize the miniaturized design of the reversing valve.

[0005] To achieve this purpose, the technical solution adopted in this utility model 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 being communicable with the rodless chamber of the hydraulic cylinder, and the oil port B being communicable 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 reversing position and a second reversing 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 the 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 reversing position, the first oil return port is connected to the oil port B, and the right shoulder blocks the second oil return port; when the main valve core is located at the second reversing position, the second oil return port is connected to 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 for 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 chamber, an annular chamber, and a second pilot chamber, which are arranged in sequence along the axial direction. The slip ring separates the annular chamber into a first annular chamber and a second annular chamber. The first pilot chamber is connected to the second annular chamber, and the second pilot chamber is connected to the first annular chamber.

[0019] When the main valve core is located at the first reversing 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 reversing 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 utility model are:

[0022] The reversing valve proposed in the utility model 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 along 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 utility model;

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

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

[0026] Figure 4 This is a schematic diagram of the structure of the valve core assembly provided by an embodiment of the present utility model;

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

[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. Limit 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] To make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present invention more clearly understood, the technical solutions of the present invention are further described below with reference to the accompanying drawings and through specific embodiments. It should be understood that the specific embodiments described herein are merely intended to explain the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of it.

[0033] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0034] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0035] In the description of this embodiment, terms such as "upper," "lower," "right," and "left" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

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

[0037] This embodiment proposes a reversing valve, primarily used for reversing a hydraulic cylinder. Specifically, the hydraulic cylinder has a rodless chamber and a rod chamber within its body. The reversing valve is mounted on the cylinder body to regulate the oil volume in the rodless and rod chambers, thereby controlling the extension or retraction of the hydraulic cylinder's piston rod within the body to achieve reciprocating motion (i.e., reversing the cylinder).

[0038] The valve body of an existing reversing valve is equipped with multiple oil ports, which selectively connect to the oil supply and return lines, as well as the rod and rodless chambers of the hydraulic cylinder. The valve core is moved within the valve body by manually toggling a reversing switch or electrically controlling the movement of the valve core, thereby altering the hydraulic circuit within the reversing valve and achieving reciprocating motion of the hydraulic cylinder. During the reversing process, the valve core moves a long distance along the valve body, resulting in a larger reversing valve, requiring more installation space and making it inconvenient to install and use.

[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 axially spaced apart 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. Oil port A126 can communicate with the rodless chamber of the hydraulic cylinder, and oil port B127 can communicate with the rod chamber 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 mounted within 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 axially along the main valve core 21. When the main valve core 21 is located in the first reversing position, the second oil inlet 123 is connected to the oil port A126, the slip ring 22 moves toward one axial side of the main valve core 21 and blocks the first oil inlet 122, and the oil port B127 is connected to the oil return port T; when the main valve core 21 is located in the second reversing position, the slip ring 22 moves toward the other axial side of the main valve core 21 and blocks the second oil inlet 123, the first oil inlet 122 is connected to the oil port B127, and the oil port A126 is connected to the oil return port T.

[0040] When the main valve core 21 is in the first reversing 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 in 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, 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 on the left and right sides of the axial direction of the main valve core 21 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, and 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, allowing high-pressure hydraulic oil to be supplied to the two oil inlets via an oil pump or other mechanism. The return oil port T is connected to an external oil tank to allow the hydraulic oil to flow back into the tank, and the oil pressure when the two oil inlets are receiving oil is much greater than the oil pressure at the return oil port T. When the valve core assembly 2 is in the first reversing position, the second oil inlet 123 is connected to the oil port A126, allowing the high-pressure hydraulic oil entering the second oil inlet 123 to push the slip 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 in the second reversing position, the first oil inlet 122 is connected to the oil port B127, allowing the high-pressure hydraulic oil entering the first oil inlet 122 to push the slip 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 reversing position and the second reversing 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 in 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 reversing 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 connected valve cover 211, a first spool 212, and a second spool 213. The second spool 213 includes a first core shaft and a second core shaft connected in a stepped manner. The diameter of the first core shaft is smaller than that of the second core shaft. One end of the first spool 212 is connected to the end of the first core shaft away from the second core shaft, forming a limiting groove 210 between the first spool 212 and the second core shaft. In this embodiment, the right end surface of the first spool 212 serves as the first sidewall of the limiting groove 210, and the stepped surface between the first and second core shafts serves as the second sidewall of the limiting groove 210. The slip ring 22 is sleeved onto the first core shaft and can abut against the right end surface of the first spool 212 or the stepped surface between the first and second core shafts. The valve cover 211 is screwed onto the left end of the first sliding valve core 212 via a threaded connection. The right end of the first sliding valve core 212 can be connected to the second sliding valve core 213 via a buckling, threaded connection, or interference fit. By configuring the main valve core 21 as a split structure, the assembly and disassembly of the main valve core 21 is facilitated, thereby improving the assembly efficiency and structural strength of the main valve core 21. It should be noted that when the first sliding valve core 212 and the second sliding valve core 213 are threadedly connected, they are mutually sheathed and pressed. To improve the positioning of the two flow channels after connection, an annular groove can be provided on the first sliding valve core 212 / second sliding valve core 213 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 within the two are connected via 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 oil port A126 and oil port B127, with the first oil inlet 122 close to oil port B127 and the second oil inlet 123 close to oil port A126. By providing two oil inlets, the two oil inlets can be selectively opened and closed according to the switching requirements, thereby switching the hydraulic circuit within 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, achieving a compact distribution of the oil inlets, while preventing the slip ring 22 from moving too long along the axial direction of the main valve core 21, reducing the size of the limit groove 210, and making the structure of the valve core assembly 2 more compact.

[0046] Furthermore, the oil return port T includes a first oil return port 124 and a second oil return port 125, spaced apart. The first oil return port 124 is adjacent to oil port B127, while the second oil return port 125 is adjacent to oil port A126. The first spool 212 has a left stop 2124, and the second spool 213 has a right stop 2133. When the main valve core 21 is in the first reversing position, the first oil return port 124 communicates with oil port B127, and the right stop 2133 blocks the second oil return port 125. When the main valve core 21 is in the second reversing position, the second oil return port 125 communicates with oil port A126, and the left stop 2124 blocks the first oil return port 124. The provision of two oil return ports allows oil port A126 and oil port B127 to selectively communicate with their respective adjacent oil return ports, optimizing the oil port distribution within the reversing valve. At the same time, the first oil return port 124 is blocked by the left shoulder 2124 of the first sliding valve core 212, and the second oil return port 125 is blocked by the right 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 connected valve seat 11 and a valve sleeve 12. An axially defined receiving groove for accommodating the valve core assembly 2 is defined within the valve sleeve 12. The receiving groove communicates with at least one axial end of the valve sleeve 12. Specifically, the receiving groove communicates with both axial ends of the valve sleeve 12, allowing the valve core assembly 2 to be laterally installed into the valve sleeve 12 along the axial direction, thereby enabling 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 that can move radially along 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 and second reversing positions, the reversing shoulder 2123 pushes the stopper back against the inner wall of the valve body 1. When the main valve core 21 is in 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 in the second reversing position, the stopper presses against the second side surface 21231 of the reversing shoulder 2123. The provision of the stopper ensures that the reversing valve maintains a set reversing pressure. Because the stopper is installed circumferentially within the valve body 1, it does not occupy axial space (left-right in the figure) of the valve body 1, reducing the axial length of the valve body 1 and further reducing the size 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 spaced apart in sequence along the axial direction. The slip ring 22 separates the annular chambers into a first annular chamber 14 and a second annular chamber 15. The first pilot chamber 13 communicates with the second annular chamber 15, and the second pilot chamber 16 communicates with the first annular chamber 14. When the main valve core 21 is in the first switching position, the second oil inlet 123, the second annular chamber 15, and the oil port A126 are connected in sequence, while the oil port B127 and the first annular chamber 14 are connected in sequence with the oil return port T. When the main valve core 21 is in the second switching 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 portion includes a stopper 3 and an embracing 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 radially along the valve body 1. The embracing ring 4 is elastically sleeved in the valve body 1 and embracing the plurality of stoppers 3. When the main valve core 21 is in the first reversing position, the stopper 3 is pressed against the first side surface 21232 of the reversing shoulder 2123, and the holding ring 4 applies an elastic holding force to the stopper 3, so that the stopper 3 presses the first side surface 21232 of the reversing shoulder 2123. When the oil pressure in the first pilot chamber 13 increases to the set value, the main valve core 21 moves from left to right under the push of the oil pressure. At this time, the reversing 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 reversing shoulder 2123, the oil pressure in the first pilot chamber 13 drops. Under the action of the elastic holding 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 reversing 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 holding 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 the cycle repeats.

[0051] In this embodiment, the second side surface 21231 of the switching shoulder 2123 is connected to the first side surface 21232 at an angle, forming a V-shaped shoulder. The second side surface 21231 of the switching shoulder 2123 is inclined relative to the first side surface 21232, allowing the stopper 3 to slide back and forth between the second side surface 21231 and the first side surface 21232. This effectively guides the stopper 3 and prevents the stopper 3 from becoming stuck between the switching shoulder 2123, thereby achieving automatic switching of the reversing valve. Specifically, the switching 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, 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 either side of the free end 21234. 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 arc-shaped.

[0052] like Figure 3 As shown, the included angle α between the second side surface 21231 and the first side surface 21232 is 90° to 150°. For example, the included angle α can be 90°, 100°, 110°, 120°, 130°, 140°, or 150°, etc., to ensure that the stopper 3 can reciprocate 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 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 small, which reduces 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 return oil port T (first return oil 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 holding 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 surface 21231 of the reversing shoulder 2123 by the elastic restoring force of the holding ring 4. Along Figure 2 As shown by the arrow, when the valve core assembly 2 is in the second reversing position, a portion of the external high-pressure hydraulic oil flows into the rod chamber through the first oil inlet 122 and oil port B127, while the remaining portion flows into the second pilot chamber 16 on the right. The hydraulic oil in the rodless chamber flows back to the tank through oil port A126 and oil return port T (second oil return port 125), causing the piston rod in the cylinder to move from right to left. When the piston rod moves to the left to its limit, the oil pressure in the second pilot chamber 16 continues to increase until it can push the stopper 3 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 by the elastic restoring force of the ring 4. This cycle repeats in sequence, thereby controlling the reciprocating motion of the hydraulic cylinder through the reversing valve.

[0054] In this embodiment, a first flow channel and a second flow channel are defined within the main valve core 21. The first pilot chamber 13, the first flow channel, and the second annular chamber 15 are sequentially connected, while the second pilot chamber 16, the second flow channel, and the first annular chamber 14 are sequentially connected. By defining two flow channels within the main valve core 21, a portion of the high-pressure hydraulic oil flows through the first flow channel to the first pilot chamber 13 or through the second flow channel to the second pilot chamber 16, thereby optimizing the hydraulic flow channel layout and simplifying the structure of the reversing valve.

[0055] Specifically, if Figures 1 to 4As shown, a reversing shoulder 2123 is provided on the outer periphery of the first sliding valve core 212. The valve cover 211 defines a first channel 2111, the first sliding valve core 212 defines a second channel 2121 and a third channel 2122, and the second sliding valve core 213 defines a fourth channel 2131 and a fifth channel 2132. One end of the first channel 2111 communicates with the first pilot chamber 13, and one end of the fourth channel 2131 communicates with 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 sequentially connected to form a first flow channel. One end of the third channel 2122 communicates with the first annular chamber 14, one end of the fifth channel 2132 communicates with the second pilot chamber 16, and the other end of the third channel 2122 communicates with the other end of the fifth channel 2132 to form a second flow channel.

[0056] In this embodiment, a reversing shoulder 2123 and a left shoulder 2124 are axially spaced apart on the outer periphery of the first spool 212. A right shoulder 2133 is provided at the end (i.e., the right end) of the second spool 213 distal from the first spool 212. The left end of the second spool 213 has a stepped shaft structure. The right end of the first spool 212 and the left end of the second spool 213 are assembled together to form a retaining groove 210. When the valve core assembly 2 is installed in the valve body 1, the left cavity of the left shoulder 2124 serves as the first pilot cavity 13, the cavity between the left shoulder 2124 and the slip ring 22 serves as the first annular cavity 14, the cavity between the slip ring 22 and the right shoulder 2133 serves as the second annular cavity 15, and the cavity enclosed by the right end of the second spool 213 and the valve sleeve 12 serves as the second pilot cavity 16. It should be noted that the switching shoulder 2123 is located within the first pilot chamber 13 and divides the first pilot chamber 13 into two interconnected left and right sections. One end of the second channel 2121 within the first spool 212 communicates with the fourth channel 2131. The other end of the second channel 2121 has two branch channels. One branch channel communicates with the first channel 2111 to deliver some hydraulic oil to the left side of the first pilot chamber 13 through the first channel 2111. The other branch channel communicates with the right side of the first pilot chamber 13 to ensure uniform injection of hydraulic oil into the first pilot chamber 13.

[0057] A plurality of through-holes 120 are defined at intervals along the circumference of the first end of the valve sleeve 12. The through-holes 120 communicate with the interior of the valve sleeve 12. A plurality of stoppers 3 are movably mounted within corresponding through-holes 120 and are capable of telescopic movement in the radial direction of the valve sleeve 12, such 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. In this embodiment, the axial direction of the through-holes 120 is parallel to the radial direction of the valve sleeve 12, allowing the stoppers 3 to extend or retract along the through-holes 120, thereby 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, a mounting groove 121 is circumferentially formed on the outer circumference of the first end of the valve sleeve 12. The bottom wall of the mounting groove 121 is provided with a plurality of through-holes 120. The holding ring 4 is elastically sleeved within the mounting groove 121. The mounting groove 121 is used to accommodate and mount the holding ring 4, allowing the holding ring 4 to be quickly installed on the valve sleeve 12, improving the installation accuracy of the holding ring 4, and ensuring that the holding ring 4 can firmly hold all the stoppers 3, thereby preventing the holding ring 4 from shifting during elastic contraction or expansion.

[0059] The above embodiments merely illustrate the basic principles and features of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications are possible without departing from the spirit and scope of the present invention. Such changes and modifications are within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended 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 cavity of a hydraulic cylinder, and the oil port B (127) being capable of communicating with a rod cavity of the hydraulic cylinder; A valve core assembly (2) comprises a main valve core (21) and a slip ring (22), wherein 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) 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, and 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 reversing position, the slip ring (22) abuts against the first side wall of the limiting groove (210); when the main valve core (21) is located in the second reversing position, the slip ring (22) abuts against the 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), the first oil inlet (122) being close to the oil port B (127), and the second oil inlet (123) being 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 the 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 further 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 (123) is communicated with the oil port A (126), the slip ring (22) blocks the first oil inlet (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 (123), the first oil inlet (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) 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 shoulder (2124), and the second sliding valve core (213) has a right 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 B (127), and the right 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 A (126), and the left 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) connected to each other. A receiving groove for accommodating the valve core assembly (2) is axially provided in the valve sleeve (12), and 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 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 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 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 cavity (13), an annular cavity, and a second pilot cavity (16) that are sequentially spaced along the axial direction; the slip ring (22) separates the annular cavity into a first annular cavity (14) and a second annular cavity (15); the first pilot cavity (13) is communicated with the second annular cavity (15), and the second pilot cavity (16) is communicated with the first annular cavity (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: A first flow channel and a second flow channel are provided in the main valve core (21); the first pilot cavity (13), the first flow channel and the second annular cavity (15) are sequentially connected; and the second pilot cavity (16), the second flow channel and the first annular cavity (14) are sequentially connected.

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