Composite reversing valve with auxiliary exhaust function and hydraulic station

Abstract

The invention provides a composite reversing valve with an auxiliary exhaust function and a hydraulic station, the composite reversing valve comprises a reversing valve body and a reversing valve core, the reversing valve body is provided with a main air inlet, a first working port, a second working port and a reversing exhaust port, and the reversing valve body is internally provided with an auxiliary exhaust cavity; an auxiliary exhaust valve element is arranged in the auxiliary exhaust cavity, and when the main air inlet communicates with the second working opening and the first working opening communicates with the reversing exhaust opening, the auxiliary exhaust valve element communicates with the first working opening and the outside; when the main air inlet is communicated with the first working port and the second working port is communicated with the reversing exhaust port, the auxiliary exhaust valve element is communicated with the second working port and the outside. The first working opening and the second working opening are switched through the auxiliary exhaust valve to communicate with the outside in sequence, so that auxiliary exhaust is conducted on the two air cavities of the air cylinder, and blocking and stopping of the piston of the air cylinder are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic stations, and in particular to a composite reversing valve with an auxiliary exhaust function and a hydraulic station with the composite reversing valve. Background Art

[0002] A hydraulic station is a hydraulic device that supplies oil according to the required flow direction, pressure and flow rate, and is usually used in conjunction with machine tools that require hydraulically driven actuators.

[0003] See also Figure 1 , which is a structural diagram of a hydraulic station provided in the prior art. As shown in the figure, the hydraulic station comprises: a linked air cylinder 1' and an oil cylinder 2'; wherein, the cylinder end covers on both sides of the air cylinder 1' are respectively provided with a first reversing trigger device 5' and a second reversing trigger device 6', and at the same time, the air cylinder 1' is connected to a reversing valve 3', and the air source is respectively connected to the first reversing trigger device 5', the second reversing trigger device 6' and the air inlet of the reversing valve 3'; the A' outlet of the reversing valve 3' is connected to one side of the cylinder 1', and the B' outlet of the reversing valve 3' is connected to the air inlet of the reversing valve 3'. The air port is connected to the other side of the cylinder 1'; the first reversing trigger device 5' is connected to the reversing valve 3' to control the reversing valve 3' to start the A' air outlet of the reversing valve 3', so that the A' air outlet of the reversing valve 3' is connected to the P' air inlet of the reversing valve 3'; the second reversing trigger device 6' is connected to the reversing valve 3' to control the reversing valve 3' to start the B' air outlet of the reversing valve 3', so that the B' air outlet of the reversing valve 3' is connected to the P' air inlet of the reversing valve 3'. The two sides of the cylinder piston (such as Figure 1 The cylinder cavities on the left and right sides (as shown) are respectively a first air cavity 11' and a second air cavity 12'.

[0004] The working process of the above hydraulic station is as follows: the pneumatic piston is located on the left side of the cylinder 1', triggering the first reversing trigger device 5' to open, pushing the reversing valve 3' to change direction, and the compressed air enters the cylinder 1' from the A' outlet, and enters the space on the left side of the pneumatic piston, thereby pushing the pneumatic piston to move to the right (the first reversing trigger device 5' is reset and cut off), driving the cylinder piston in the oil cylinder 2' to move to the right; the pneumatic piston moves to the right side of the cylinder 1', triggering the second reversing trigger device 6' to open, pushing the reversing valve 3' to change direction, and the compressed air from The air outlet B' enters the cylinder 1' and enters the space on the right side of the pneumatic piston, thereby pushing the pneumatic piston to move to the left (the second reversing trigger device 6' is reset and cut off), driving the cylinder piston in the oil cylinder 2' to move to the left, so that the hydraulic oil goes in and out; the cylinder 1' reciprocates to form a continuous hydraulic output. When the set pressure is reached, the cylinder 1' stops moving to keep the pressure constant. The cylinder 1' remains in a pressurized state and stops moving, so that compressed air is no longer consumed. Compared with traditional hydraulic stations, energy consumption and heat generation are reduced, thereby achieving energy saving.

[0005] In the factory use environment, the above-mentioned hydraulic station is generally provided with an elastic core shaft on the cylinder end cover. When the pneumatic piston moves to the end, the core shaft is squeezed to move, triggering the reversing trigger device to make the reversing valve reverse, thereby reversing the cylinder piston. Such a reciprocating cycle drives the cylinder to continuously supply oil. The reversing trigger device can be an electromagnetic induction switch, an electromagnetic contact switch or a mechanical valve, etc. The reversing trigger device has a certain trigger stroke. When the air source pressure drops or fluctuates greatly, for example, there are other air-using units (air blowing guns, etc.) on the air line, resulting in unstable air source pressure, low air supply pressure, and the core shaft cannot move to reach the trigger stroke. The reversing valve cannot be reversed normally, and the cylinder piston becomes stuck, resulting in the cylinder being unable to continuously supply oil. Summary of the invention

[0006] In view of this, the present invention proposes a composite reversing valve and a hydraulic station with auxiliary exhaust function, aiming to solve the problem of cylinder jamming in the existing hydraulic station.

[0007] On the one hand, the present invention proposes a composite reversing valve with an auxiliary exhaust function, the composite reversing valve comprising a reversing valve body and a reversing valve core that slides and switches in the reversing valve body, the reversing valve body being provided with a main air inlet, a first working port, a second working port and a reversing exhaust port, the reversing valve core being able to switch to a position where the main air inlet is connected to the first working port and the second working port is connected to the reversing exhaust port, or to a position where the main air inlet is connected to the second working port and the first working port is connected to the reversing exhaust port; an auxiliary exhaust chamber is provided in the reversing valve body, and an auxiliary exhaust valve core is provided in the auxiliary exhaust chamber; when the main air inlet is connected to the second working port and the first working port is connected to the reversing exhaust port, the auxiliary exhaust valve core connects the first working port with the outside world or the first working port with the reversing exhaust port; when the main air inlet is connected to the first working port and the second working port is connected to the reversing exhaust port, the auxiliary exhaust valve core connects the second working port with the outside world or the second working port with the reversing exhaust port.

[0008] Further, in the above-mentioned composite reversing valve, the auxiliary exhaust chamber includes: a first auxiliary push section, an auxiliary exhaust section and a second auxiliary push section which are arranged in sequence; wherein, the first auxiliary push section and the second auxiliary push section are respectively connected to the first working port and the second working port, and the auxiliary exhaust section is connected to the outside or the auxiliary exhaust section is connected to the reversing exhaust port; the auxiliary exhaust valve core is slidably arranged in the auxiliary exhaust section, for sliding to a first state in which the first auxiliary push section is connected to the auxiliary exhaust section under the action of the air pressure in the second auxiliary push section or sliding to a second state in which the second auxiliary push section is connected to the auxiliary exhaust section under the action of the air pressure in the first auxiliary push section.

[0009] Furthermore, in the above-mentioned composite reversing valve, a third working port for connecting to the first working port is opened on the cavity wall of the first auxiliary push section, a fourth working port for connecting to the second working port is opened on the cavity wall of the second auxiliary push section, and an auxiliary exhaust port for connecting to the outside or the reversing exhaust port is opened on the cavity wall of the auxiliary exhaust section.

[0010] Furthermore, in the above-mentioned composite reversing valve, a first connecting channel is provided on the auxiliary exhaust valve core or the reversing valve body; when the auxiliary exhaust valve core is in a first state, the first connecting channel connects the auxiliary exhaust port and the first auxiliary push section to form a first auxiliary exhaust passage; when the auxiliary exhaust valve core is in a second state, the first connecting channel connects the auxiliary exhaust port and the second auxiliary push section to form a second auxiliary exhaust passage.

[0011] Furthermore, in the above-mentioned composite reversing valve, a notch is provided on the outer peripheral wall of the auxiliary exhaust valve core at a middle position thereof, and the notch can form a gap channel connected to the auxiliary exhaust port between the notch and the inner wall of the auxiliary exhaust section; a first connecting groove and a second connecting groove which are both connected to the notch are provided on both sides of the notch, and when the auxiliary exhaust valve core is in a first state, the first connecting groove is connected to the first auxiliary push section, and the first connecting groove and the gap channel are combined to form the first auxiliary exhaust passage; when the auxiliary exhaust valve core is in a second state, the second connecting groove is connected to the second auxiliary push section, and the second connecting groove and the gap channel are combined to form the second auxiliary exhaust passage.

[0012] Furthermore, in the above-mentioned composite reversing valve, the auxiliary exhaust valve core is sleeved with a first sealing ring and a second sealing ring; when the auxiliary exhaust valve core is in a first state, the second sealing ring and the first connecting groove are both located in the auxiliary exhaust section; when the auxiliary exhaust valve core is in a second state, the first sealing ring and the second connecting groove are both located in the auxiliary exhaust section.

[0013] Furthermore, in the above-mentioned composite reversing valve, a circumferential gap is provided between the auxiliary exhaust valve core and the inner wall of the auxiliary exhaust section; when the auxiliary exhaust valve core is in a first state, the second sealing ring is located in the circumferential gap between the auxiliary exhaust valve core and the inner wall of the auxiliary exhaust section and is placed between the third working port and the auxiliary exhaust port to perform in-hole sealing; when the auxiliary exhaust valve core is in a second state, the first sealing ring is located in the circumferential gap between the auxiliary exhaust valve core and the auxiliary exhaust valve housing and is placed between the fourth working port and the auxiliary exhaust port to perform in-hole sealing.

[0014] Further, in the above-mentioned composite reversing valve, the auxiliary exhaust chamber includes: a first exhaust section, an exhaust reversing section and a second exhaust section which are arranged in sequence; wherein the auxiliary exhaust valve core is slidably arranged in the exhaust reversing section; a first auxiliary exhaust port which is connected to the reversing exhaust port or the outside is provided on the chamber wall of the first exhaust section, and a second auxiliary exhaust port which is connected to the reversing exhaust port or the outside is provided on the chamber wall of the second exhaust section; a third working port which is connected to the first working port and a fourth working port which is connected to the second working port are also provided on the chamber wall of the exhaust reversing section, so that the auxiliary exhaust valve core can slide to the second state under the action of the intake pressure of the first working port, or slide to the first state under the action of the intake pressure of the second working port.

[0015] Furthermore, in the above-mentioned composite reversing valve, a first limiting structure is provided in the auxiliary exhaust chamber, which is used to limit the auxiliary exhaust valve core so that it is limited to connect the first working port with the outside world or the first working port with the reversing exhaust port; a second limiting structure is provided in the auxiliary exhaust chamber, which is used to limit the auxiliary exhaust valve core so that it is limited to connect the second working port with the outside world or the second working port with the reversing exhaust port.

[0016] The composite reversing valve provided by the present invention can be switched when the reversing valve core is in different states through the setting of the auxiliary exhaust valve core. The auxiliary exhaust valve core switches the first working port and the second working port to connect to the outside or the reversing exhaust port in turn, so as to perform auxiliary exhaust on the first working port and the second working port in turn. When the main air inlet P is connected with the second working port B and the first working port A is connected with the reversing exhaust port, the auxiliary exhaust valve core connects the first working port A with the outside world or the first working port A with the reversing exhaust port, and the first working port A is assisted to exhaust, that is, the first air cavity is assisted to exhaust, so that the cylinder piston moves to the side where the second air cavity is located under the action of the air pressure in the first air cavity, so as to ensure that the cylinder piston can move to the position, so that the reversing valve core can be switched to the position, and the reversing valve core is controlled to be switched until the main air inlet P is connected with the first working port A and the second working port B is connected with the reversing exhaust port. In particular, when the air source pressure drops or fluctuates greatly, the composite reversing valve can be switched to the state where the main air inlet P is connected with the first working port A and the second working port B is connected with the reversing exhaust port, that is, the state where the first air cavity is inhaled and the second air cavity is exhausted, so as to avoid the cylinder from being stuck, that is, to avoid the cylinder piston from stopping moving and no longer outputting hydraulic pressure, resulting in the loss of pressure in the tooling, resulting in the workpiece being not clamped tightly, the tool hitting, etc. When the main air inlet P is connected with the first working port A and the second working port B is connected with the reversing exhaust port, the auxiliary exhaust valve core connects the second working port B with the outside world or the second working port B with the reversing exhaust port, and performs auxiliary exhaust on the second working port B, that is, performs auxiliary exhaust on the first air cavity, so that the cylinder piston moves to the side where the first air cavity is located under the action of the air pressure in the second air cavity, so as to ensure that the cylinder piston can move to the position, so that the reversing valve core can be switched to the position, and the reversing valve core is controlled to be switched until the main air inlet P is connected with the second working port B and the first working port A is connected with the reversing exhaust port, especially when the air source pressure drops or fluctuates greatly, the composite reversing valve can be switched to the state where the main air inlet P is connected with the second working port B and the first working port A is connected with the reversing exhaust port, that is, the state where the second air cavity is inhaled and the first air cavity is exhausted, so as to avoid the cylinder from being stuck, that is, to avoid the cylinder piston from stopping moving and no longer outputting hydraulic pressure, resulting in the loss of pressure in the tooling, resulting in the workpiece not being clamped tightly, the tool hitting, and the like.

[0017] In particular, the auxiliary exhaust valve core is arranged in the valve body of the reversing valve, which has a compact structure and does not require external pipelines for connection. It can avoid problems such as connection errors and cluttered pipelines caused by multiple external pipelines. At the same time, it can avoid leakage caused by poor pipeline connections, and further avoid the problem of the reversing valve getting stuck.

[0018] Furthermore, the auxiliary exhaust valve core is arranged in parallel with the reversing valve core, so that the auxiliary exhaust valve core can be switched when the first working port and the second working port are inlet and outlet, further simplifying the structure of the composite reversing valve.

[0019] On the other hand, the present invention further proposes a hydraulic station, which is provided with the above-mentioned composite reversing valve.

[0020] Since the composite reversing valve has the above-mentioned effects, the hydraulic station having the composite reversing valve also has corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings: Figure 1 It is a structural schematic diagram of a hydraulic station provided in the prior art; Figure 2 It is a structural schematic diagram of a compound reversing valve in a stuck state provided in the prior art; Figure 3 A schematic diagram of the structure of a composite reversing valve provided in an embodiment of the present invention, wherein the reversing valve core is in a first air inlet and outlet state, the second working port B is connected to the main air inlet P, and the first working port A is connected to the first reversing exhaust port R1; Figure 4 A schematic diagram of the structure of a composite reversing valve provided in an embodiment of the present invention, wherein the valve core of the reversing valve moves rightward to a position where the first working port air intake is just opened and the second working port exhaust is closed; Figure 5 for Figure 4 A partial enlarged view of point E in the middle; Figure 6 for Figure 4 A partial enlarged view of point F in the middle; Figure 7 A schematic diagram of the structure of a composite reversing valve provided in an embodiment of the present invention, wherein the reversing valve core is in a second air inlet and outlet state, the first working port A is connected to the main air inlet P, and the second working port B is connected to the second reversing exhaust port R2; Figure 8 A schematic diagram of the structure of a composite reversing valve provided in an embodiment of the present invention, wherein the valve core of the reversing valve moves to the left to a position where the second working port is just opened for air intake and the first working port is closed for exhaust; Fig. 9 for Figure 8 A partial enlarged view of the M in the middle; Fig.10 for Figure 8 A local enlarged view of the N position in the middle; Fig.11 A schematic diagram of the structure of an auxiliary exhaust valve core provided in an embodiment of the present invention; Fig.12A cross-sectional view of the auxiliary exhaust valve core provided in an embodiment of the present invention at the first connecting groove or the second connecting groove; Fig.13 A schematic diagram of the structure of a composite reversing valve provided in another embodiment of the present invention, wherein the reversing valve core is in a first air inlet and outlet state, the second working port B is connected to the main air inlet P, and the first working port A is connected to the first reversing exhaust port R1; Fig.14 A schematic diagram of the structure of an auxiliary exhaust valve core provided by another embodiment of the present invention; Explanation of the reference numerals: 1-reversing valve body, 11-auxiliary exhaust chamber, 111-first auxiliary push section, 112-auxiliary exhaust section, 113-second auxiliary push section, 114-first exhaust section, 115-exhaust reversing section, 116-second exhaust section, 117-first switching chamber, 118-second switching chamber, 12-reversing working chamber, 13-second connecting channel, 14-third connecting channel, 15-piston chamber, 16-breathing hole, 2-reversing valve core, 3-auxiliary exhaust valve core, 311-notch, 312-first connecting groove, 313-second connecting groove, 314-first large-diameter valve core, 315-small-diameter valve core, 316-second large-diameter valve core Valve core, 317-first sealing ring, 318-second sealing ring, 321-valve core body, 322-first switching rod, 323-second switching rod, 324-third sealing ring, 325-fourth sealing ring, 326-fifth sealing ring, 4-sealing cover, 41-cover body 41, 42-limiting column, 5-plug, 6-air control piston, P-main air inlet, A-first working port, B-second working port, R1-first reversing exhaust port, R2-second reversing exhaust port, Y1-first control port, Y2-second control port, C-third working port, D-fourth working port, S-auxiliary exhaust port, S1-first auxiliary exhaust port, S2-second auxiliary exhaust port. DETAILED DESCRIPTION

[0022] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to be able to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] Compound reversing valve embodiment: It is well known in the art that in order to avoid exhausting the cavities on both sides of the cylinder at the same time, the reversing valve 3' has the characteristic of first in and last out, that is, the communication port corresponding to the air inlet is connected first, while the communication port corresponding to the exhaust port is connected later.

[0024] like Figure 2 As shown, when the reversing valve core is pushed to move to the right, that is, port A' switches from air intake to exhaust, and port B' switches from exhaust to air intake, when the air intake of port A' is closed and the exhaust is not yet opened, the exhaust of port B' is closed, and the air intake is just opened, that is, port B' has just taken in air, and the air intake and exhaust of port A' are both closed. Since the pressure of the air cavity connected to port A' is relatively large, the air cavity connected to port B' takes in air from port B', causing pressure in the cylinders at both ends, and the pilot valve corresponding to the air cavity connected to port B' is reset and closed, or the air source pressure decreases, etc., which makes the air pressure that pushes the reversing valve core to move to the right decrease, causing the reversing valve to stop. The reversing valve stops, causing the cylinder piston to stop moving, resulting in no more hydraulic output, and the tooling loses pressure, resulting in problems such as the workpiece not being clamped tightly and the tool hitting.

[0025] See also Figures 3 to 10 , which shows the preferred structure of the composite reversing valve provided by the embodiment of the present invention. As shown in the figure, the composite reversing valve comprises: a reversing valve body 1, a reversing valve core 2 and an auxiliary exhaust valve core 3.

[0026] The reversing valve core 2 slides and switches in the reversing valve body 1. The reversing valve body 1 is provided with a main air inlet P, a first working port A, a second working port B and a reversing exhaust port. The reversing valve core 2 can be switched to a position where the main air inlet P is connected to the first working port A and the second working port B is connected to the reversing exhaust port, or switched to a position where the main air inlet P is connected to the second working port B and the first working port A is connected to the reversing exhaust port.

[0027] Specifically, there are two reversing exhaust ports, namely, the first reversing exhaust port R1 and the second reversing exhaust port R2, which correspond to the first working port A and the second working port B respectively. The corresponding first working port A and the first reversing exhaust port R1 are placed on the same side of the main air inlet P (such as Figure 3 The second working port B and the second reversing exhaust port R2 are placed on the other side of the main air inlet P (as shown in FIG. Figure 3 The right side of the figure shows that the corresponding working port and the reversing exhaust port are connected to each other, and the reversing valve core 2 is switched to the first inlet and outlet state (such as Figure 3 When the reversing valve core 2 is switched to the first inlet and outlet state (as shown in the state), the second working port B is connected to the main air inlet P, and the first working port A is connected to the first reversing exhaust port R1; Figure 5In the state shown in the figure), the first working port A is connected to the main air inlet P, and the second working port B is connected to the second reversing exhaust port R2. Of course, in other embodiments, there can be one reversing exhaust port, which is not limited in the present embodiment. For example, in the air-controlled reversing valve disclosed in China with the publication number CN119163771A, there is one reversing exhaust port. The reversing valve body 1 can be a rectangular parallelepiped structure, and the main air inlet P, the first working port A, the second working port B, the first reversing exhaust port R1 and the second reversing exhaust port R2 are all arranged on the bottom wall of the reversing valve body 1 (relative to the bottom wall of the reversing valve body 1). Figure 3 Of course, it can also be opened on other walls, and this embodiment does not impose any restrictions on it. In this embodiment, a reversing working chamber 12 is further provided in the reversing valve body 1, and the reversing valve core 2 is slidably arranged in the reversing working chamber 12.

[0028] An auxiliary exhaust chamber 11 is provided in the reversing valve body 1, and an auxiliary exhaust valve core 3 is provided in the auxiliary exhaust chamber 11. When the main air inlet P is connected with the second working port B and the first working port A is connected with the reversing exhaust port, the auxiliary exhaust valve core 3 connects the first working port A with the outside or the reversing exhaust port. When the main air inlet P is connected with the first working port A and the second working port B is connected with the reversing exhaust port, the auxiliary exhaust valve core 3 connects the second working port B with the outside or the reversing exhaust port.

[0029] Specifically, the auxiliary exhaust chamber 11 can be arranged in parallel with the reversing working chamber 12, and both are arranged along the length direction of the reversing valve body 1 (such as Figure 3 In this embodiment, in order to facilitate the processing of the auxiliary exhaust chamber 11, preferably, the auxiliary exhaust chamber 11 is a through hole structure penetrating the valve body 1 of the reversing valve, that is, the auxiliary exhaust chamber 11 is a cavity structure with two ends open, and both open ends thereof can be provided with a blocking cover 4 to seal the open end of the auxiliary exhaust chamber 11.

[0030] In such Figure 3 When the reversing valve core 2 shown is in the first air inlet and outlet state, that is, the second working port B is connected to the main air inlet P and the first working port A is connected to the first reversing exhaust port R1, the auxiliary exhaust valve core 3 connects the first working port A with the outside world or connects the first working port A with the reversing exhaust port. For example, the auxiliary exhaust valve core 3 connects the first working port A with the outside world, or the auxiliary exhaust valve core 3 connects the first working port A with the first reversing exhaust port R1. In this embodiment, the auxiliary exhaust valve core 3 connecting the first working port A with the outside world is used as an example to illustrate that the first working port A can be assisted to exhaust, and then the first air cavity of the cylinder connected to the first working port A can be assisted to exhaust, so that the cylinder piston moves to the side where the first air cavity is located under the action of the air pressure in the second air cavity, so as to ensure that the cylinder piston can move to the position and trigger the first reversing trigger device to control the reversing valve core 2 to slide to the right to switch to the position as shown in FIG. Figure 7The position shown in the figure where the first working port A is connected to the main air inlet P and the second working port B is connected to the reversing exhaust port can avoid the cylinder piston from getting stuck. Figure 7 When the reversing valve core shown is in the second air inlet and outlet state, that is, when the first working port A is connected to the main air inlet P and the second working port B is connected to the second reversing exhaust port R2, the auxiliary exhaust valve core 3 connects the second working port B with the outside world or the second working port B with the reversing exhaust port, for example, the auxiliary exhaust valve core 3 connects the second working port B with the outside world, or the auxiliary exhaust valve core 3 connects the second working port B with the second reversing exhaust port R2, so as to perform auxiliary exhaust of the second working port B, and then perform auxiliary exhaust of the second air cavity of the cylinder connected to the second working port B, so that the cylinder piston moves to the side where the second air cavity is located under the action of the air pressure in the first air cavity, so as to ensure that the cylinder piston can move to the position and trigger the second reversing trigger device, so as to control the reversing valve core 2 to slide to the left to switch to the position as shown in the figure. Figure 3 The position shown in which the second working port B is connected to the main air inlet port P and the first working port A is connected to the reversing exhaust port can avoid the cylinder piston from getting stuck.

[0031] In this embodiment, if Figure 3 As shown, from the moment when the reversing valve core 2 is switched to the second working port B connected to the main air inlet P and the first working port A is connected to the first reversing exhaust port R1, the auxiliary exhaust valve core 3 can be quickly switched to the moment when the second working port B is connected to the main air inlet P and the first working port A is connected to the first reversing exhaust port R1. Figure 3 The state of connecting the first working port A with the outside shown; that is, from the time when the reversing valve core 2 is switched to the position where the second working port B is connected to the main air inlet P and the first working port A is connected to the first reversing exhaust port R1, until the time when the reversing valve core 2 is switched to the position where the first working port A is connected to the main air inlet P and the second working port B is connected to the second reversing exhaust port R2, the auxiliary exhaust valve core 3 is in the state of connecting the first working port A with the outside. In particular, when the reversing valve core 2 is in the middle position so that the first working port A is inlet and the second working port B is not exhausting, that is, as shown Figure 4 and Figure 5 As shown, the first working port A is just connected to the main air inlet P, and as Figure 4 and Figure 6 When the second working port B and the second reversing exhaust port R2 shown are not opened, the auxiliary exhaust valve core 3 connects the first working port A with the outside world or the first working port A with the reversing exhaust port. In this embodiment, the auxiliary exhaust valve core 3 is in a state of connecting the first working port A with the outside world, and can discharge the intake of the first working port A to avoid the intake of the first working port A pressing the cylinder piston to move in the opposite direction. The first working port A is assisted in exhausting by the auxiliary exhaust valve core 3, and the first air cavity is assisted in exhausting, so that the cylinder piston can continue to move to the left, so as to ensure that the cylinder piston moves to the left and is in place and triggers the first reversing trigger device, thereby avoiding the reversing valve core 2 from getting stuck.

[0032] like Figure 7 As shown, when the reversing valve core 2 slides to the moment when the first working port A is connected to the main air inlet P and the second working port B is connected to the second reversing exhaust port R2, the auxiliary exhaust valve core 3 can be quickly reversed to the moment when the second working port B is connected to the second reversing exhaust port R2. Figure 7 The state of connecting the second working port B with the outside shown in the figure; that is, from the time when the reversing valve core 2 slides to the time when the first working port A is connected with the main air inlet P and the second working port B is connected with the second reversing exhaust port R2, until the time when the reversing valve core 2 slides to the time when the second working port B is connected with the main air inlet P and the first working port A is connected with the first reversing exhaust port R1, the auxiliary exhaust valve core 3 is in the state of connecting the second working port B with the outside. In particular, when the reversing valve core 2 is in the middle position so that the second working port B is inlet and the first working port A is not exhausting, that is, as shown in FIG. Figure 8 and Fig. 9 As shown, the second working port B is just connected to the main air inlet P, and as Figure 8 and Fig.10 As shown, when the first working port A and the first reversing exhaust port R1 are not opened, the auxiliary exhaust valve core 3 connects the second working port B with the outside or the second working port B with the reversing exhaust port. The auxiliary exhaust valve core 3 is in a state of connecting the second working port B with the outside, and can discharge the intake of the second working port B to avoid the intake of the second working port B pressing the cylinder piston to move in the opposite direction. The second working port B is assisted to be exhausted by the auxiliary exhaust valve core 3, and the second air cavity is assisted to be exhausted, so that the cylinder piston can continue to move to the right, so as to ensure that the cylinder piston moves to the right into position and triggers the second reversing trigger device, thereby avoiding the reversing valve core 2 from getting stuck.

[0033] In this embodiment, the reversing valve body 1 is also provided with a third working port C connected to the first working port A, a fourth working port D connected to the second working port B, and an auxiliary exhaust port S connected to the outside or the reversing exhaust port; when the main air inlet P is connected to the second working port B and the first working port A is connected to the reversing exhaust port, the auxiliary exhaust valve core 3 connects the third working port C and the auxiliary exhaust port S; when the main air inlet P is connected to the first working port A and the second working port B is connected to the reversing exhaust port, the auxiliary exhaust valve core 3 connects the fourth working port D and the auxiliary exhaust port S.

[0034] In this embodiment, the auxiliary exhaust chamber 11 and the auxiliary exhaust valve core 3 are implemented as follows. Figure 3 , Figure 4 , Figure 7 and Figure 8 The auxiliary exhaust chamber 11 includes: a first auxiliary pushing section 111, an auxiliary exhaust section 112 and a second auxiliary pushing section 113 which are arranged in sequence.

[0035] The first auxiliary push section 111 and the second auxiliary push section 113 are respectively connected to the first working port A and the second working port B, and the auxiliary exhaust section 113 is connected to the outside or the auxiliary exhaust section 113 is connected to the reversing exhaust port. The auxiliary exhaust valve core 3 is slidably disposed in the auxiliary exhaust section 112.

[0036] Specifically, the first auxiliary pushing section 111, the auxiliary exhaust section 112 and the second auxiliary pushing section 113 are arranged from left to right (relative to Figure 3 The auxiliary exhaust section 112 is adapted to the outer diameter of the auxiliary exhaust valve core 3 so that the auxiliary exhaust valve core 3 is slidably connected to the cavity wall of the auxiliary exhaust section 112, and the auxiliary exhaust section 112 can guide the sliding of the auxiliary exhaust valve core 3. The diameters of the first auxiliary push section 111 and the second auxiliary push section 113 are the same and larger than the diameter of the auxiliary exhaust section 112 to avoid interfering with the movement of the auxiliary exhaust valve core 3. The first auxiliary push section 111 and the second auxiliary push section 113 are respectively connected to the first working port A and the second working port B, and can respectively realize the intake and exhaust in the first auxiliary push section 111 and the second auxiliary push section 113, and then can push the auxiliary exhaust valve core 3 to slide left and right, so that the auxiliary exhaust valve core 3 can slide with the intake and exhaust of the first working port A and the second working port B, that is, adjust the position. The auxiliary exhaust section 113 is connected to the outside or the auxiliary exhaust section 113 is connected to the reversing exhaust port. In this embodiment, the auxiliary exhaust section 113 is connected to the outside as an example for explanation. Of course, in other embodiments, the auxiliary exhaust section 113 may also be connected to the reversing exhaust port, and this embodiment does not impose any limitation on it.

[0037] like Figure 3 As shown, when the main air inlet P is connected to the second working port B and the first working port A is connected to the reversing exhaust port, the auxiliary exhaust valve core 3 slides to the first state where the first auxiliary pushing section 111 is connected to the auxiliary exhaust section 112 under the action of the air pressure in the second auxiliary pushing section 113. Figure 7 As shown, when the main air inlet P is connected to the first working port A and the second working port B is connected to the reversing exhaust port, the auxiliary exhaust valve core 3 slides to the second state where the second auxiliary pushing section 113 is connected to the auxiliary exhaust section 112 under the action of the air pressure in the first auxiliary pushing section 111.

[0038] Specifically, if Figure 3As shown, when the main air inlet P is connected to the second working port B and the first working port A is connected to the first reversing exhaust port R1, the second auxiliary push section 113 and the second air cavity are connected to the main air inlet P through the second working port B, and the first air cavity and the first auxiliary push section 111 are connected to the first reversing exhaust port R1 through the first working port A, then the second auxiliary push section 113 takes in air and the first auxiliary push section 111 exhausts air. Under the action of air pressure, the auxiliary exhaust valve core 3 slides to the left to the left end limit, that is, it is in the first state, and the first auxiliary push section 111 is connected to the auxiliary exhaust section 112. Figure 7 As shown, when the main air inlet P is connected to the first working port A and the second working port B is connected to the reversing exhaust port, the second auxiliary push section 113 and the second air cavity are both connected to the second reversing exhaust port R2 through the second working port B, and the first air cavity and the first auxiliary push section 111 are both connected to the main air inlet P through the first working port A, then the first auxiliary push section 111 takes in air and the second auxiliary push section 113 exhausts air, and under the action of air pressure, the auxiliary exhaust valve core 3 slides to the right to the right end limit, that is, it is in the second state, and the second auxiliary push section 113 is connected to the auxiliary exhaust section 112.

[0039] Continue to see Figure 3 , Figure 4 , Figure 7 and Figure 8 A third working port C for connecting to the first working port A is opened on the cavity wall of the first auxiliary pushing section 111, a fourth working port D for connecting to the second working port B is opened on the cavity wall of the second auxiliary pushing section 113, and an auxiliary exhaust port S for connecting to the outside or a reversing exhaust port is opened on the cavity wall of the auxiliary exhaust section 112.

[0040] Specifically, the third working port C is connected to the first working port A through the second communication channel 13, and the fourth working port D is connected to the second working port B through the third communication channel 14. To facilitate the processing of the second communication channel 13 and the third communication channel 14, preferably, the second communication channel 13 and the third communication channel 14 can be formed along the width direction of the reversing valve body 1 (such as Figure 3 The second and third connecting channels 13 and 14 are through holes or blind holes arranged in the vertical direction (as shown in the figure), especially the second and third connecting channels 13 and 14 are hole structures with top openings. The bottom ends of the second and third connecting channels 13 and 14 can be connected to the first working port A and the second working port B respectively, and a plug 5 can be provided at the top to block the open ends of the second and third connecting channels 13 and 14. In this embodiment, one end of the auxiliary exhaust port S is connected to the auxiliary exhaust section 112, and the other end is an open end, that is, connected to the outside world. A muffler (not shown in the figure) can be provided at the open end of the auxiliary exhaust port S. Of course, the two ends of the auxiliary exhaust port S can also be connected to the auxiliary exhaust section 112 and the reversing exhaust port respectively. In this embodiment, there is no limitation on the exhaust mode of the auxiliary exhaust port S.

[0041] In this embodiment, a first connecting channel is provided on the auxiliary exhaust valve core 3 or the reversing valve body 1; when the auxiliary exhaust valve core 3 is in the first state, the first connecting channel connects the auxiliary exhaust port S with the first auxiliary push section 111 to form a first auxiliary exhaust passage; when the auxiliary exhaust valve core 3 is in the second state, the first connecting channel connects the auxiliary exhaust port S with the second auxiliary push section 113 to form a second auxiliary exhaust passage.

[0042] Continue to see Figure 3 , Figure 4 , Figure 7 , Figure 8 , Fig.11 and Fig.12 A notch 311 is provided at the middle position of the outer peripheral wall of the auxiliary exhaust valve core 3 , and a gap channel communicating with the auxiliary exhaust port S can be formed between the notch 311 and the inner wall of the auxiliary exhaust section 112 .

[0043] Specifically, a notch 311 is provided on the outer peripheral wall of the auxiliary exhaust valve core 3 at the middle position of the auxiliary exhaust valve core 3 and is arranged along the entire circumference of the auxiliary exhaust valve core 3, that is, the notch 311 is a circumferential notch, and the notch 311 can form an annular gap channel connected to the auxiliary exhaust port S between the inner wall of the auxiliary exhaust section 112. The setting of the circumferential notch enables the auxiliary exhaust valve core 3 to form a first large-diameter valve core 314, a small-diameter valve core 315, and a second large-diameter valve core 316 from one end to the other end. The outer diameters of the first large-diameter valve core 314 and the second large-diameter valve core 316 are the same and larger than the outer diameter of the small-diameter valve core 315. In particular, the outer diameters of the first large-diameter valve core 314 and the second large-diameter valve core 316 are adapted to the diameter of the auxiliary exhaust section 112, that is, the outer walls of the first large-diameter valve core 314 and the second large-diameter valve core 316 can be slidably connected with the inner wall of the auxiliary exhaust section 112, and an annular gap channel can be formed between the outer wall of the small-diameter valve core 315 and the inner wall of the auxiliary exhaust section 112. The length of the annular gap channel (such as Figure 3 The length direction shown in the figure, that is, the length of the small-diameter valve core 315 can be adapted to the sliding stroke of the auxiliary exhaust valve core 3, especially greater than or equal to the sliding stroke of the auxiliary exhaust valve core 3, so that the annular gap channel is always connected with the auxiliary exhaust port S, that is, when the auxiliary exhaust valve core 3 slides to any position, the annular gap channel is connected with the auxiliary exhaust port S, and the annular gap channel is not connected with the first auxiliary pushing section 111 and the second auxiliary pushing section 113.

[0044] Continue to see Figure 3 , Figure 4 , Figure 7 , Figure 8 , Fig.11 and Fig.12A first connecting groove 312 and a second connecting groove 313 are provided on both sides of the notch 311, both of which are connected to the notch 311. When the auxiliary exhaust valve core 3 is in the first state, the first connecting groove 312 is connected to the first auxiliary push section 111, and the first connecting groove 312 and the gap channel are combined to form a first auxiliary exhaust passage; when the auxiliary exhaust valve core 3 is in the second state, the second connecting groove 313 is connected to the second auxiliary push section 113, and the second connecting groove 313 and the gap channel are combined to form a second auxiliary exhaust passage.

[0045] Specifically, the auxiliary exhaust valve core 3 has two sides (such as Fig.11 The left and right sides as shown in the figure) are respectively provided with a first communicating groove 312 and a second communicating groove 313, and the first communicating groove 312 and the second communicating groove 313 are both connected to the notch 311; the first communicating groove 312 and the second communicating groove 313 are respectively provided on the first large diameter valve core 314 and the second large diameter valve core 316, and the first communicating groove 312 and the second communicating groove 313 can be multiple, and are evenly arranged along the circumference of the first large diameter valve core 314 and the second large diameter valve core 316. In this embodiment, four are taken as an example for explanation, and other numbers can be used, and there is no limitation on them in this embodiment.

[0046] like Figure 3 As shown, when the auxiliary exhaust valve core 3 is in the first state, part of the first connecting groove 312 is located in the auxiliary exhaust section 112, and the other part is located in the first auxiliary push section 111, which can connect the first auxiliary push section 111 with the annular gap channel. The first connecting groove 312 and the annular gap channel are combined to form a first auxiliary exhaust passage, which realizes the connection between the auxiliary exhaust port S and the first auxiliary push section 111, and then realizes the connection between the auxiliary exhaust port S and the third working port C, so that the intake air of the first working port A can flow from the second connecting channel 13 through the third working port C into the first auxiliary push section 111, and flow from the first connecting groove 312 into the annular gap channel, and be discharged from the auxiliary exhaust port S. At the same time, the second connecting groove 313 is entirely located in the auxiliary exhaust section 112, cutting off the connection with the second auxiliary push section 113. As shown Figure 7As shown, when the auxiliary exhaust valve core 3 is in the second state, part of the second connecting groove 313 is located in the auxiliary exhaust section 112, and the other part is located in the second auxiliary push section 113, which can connect the second auxiliary push section 113 with the annular gap channel. The second auxiliary push section 113 and the annular gap channel are combined to form a second auxiliary exhaust passage, so as to realize the connection between the auxiliary exhaust port S and the second auxiliary push section 113, and then realize the connection between the auxiliary exhaust port S and the fourth working port D, so that the intake air of the second working port B can flow from the third connecting channel 14 through the fourth working port D into the second auxiliary push section 113, and flow from the second connecting groove 313 into the annular gap channel, and be discharged from the auxiliary exhaust port S. At the same time, the first connecting groove 312 is completely located in the first auxiliary push section 111, and the connection with the first auxiliary push section 111 is cut off.

[0047] In this embodiment, the provision of the first communicating groove 312 and the second communicating groove 313 makes the reversing sliding smoother, thereby ensuring the balance and stability of each cavity.

[0048] Continue to see Figure 3 , Figure 4 , Figure 7 , Figure 8 , Fig.11 In order to avoid gas leakage and flow when the side is cut off, preferably, a first sealing ring 317 and a second sealing ring 318 are sleeved on the auxiliary exhaust valve core 3. When the auxiliary exhaust valve core 3 is in the first state, the second sealing ring 318 is located between the fourth working port D and the auxiliary exhaust port S, cutting off the second auxiliary exhaust passage; when the auxiliary exhaust valve core 3 is in the second state, the first sealing ring 38 is located between the third working port C and the auxiliary exhaust port S, cutting off the first auxiliary exhaust passage.

[0049] Specifically, the first sealing ring 317 and the second sealing ring 318 can be respectively sleeved on the first large-diameter valve core 314 and the second large-diameter valve core 316, and the first sealing ring 317 and the second sealing ring 318 can be adapted to the inner wall of the auxiliary exhaust section 112, and are used to respectively seal the gaps between the first large-diameter valve core 314, the second large-diameter valve core 316 and the inner wall of the auxiliary exhaust section 112. When the auxiliary exhaust valve core 3 is in the first state, the second sealing ring 318 and the second connecting groove 313 are both located in the auxiliary exhaust section 112; when the auxiliary exhaust valve core 3 is in the second state, the first sealing ring 317 and the first connecting groove 312 are located in the auxiliary exhaust section 112.

[0050] In this embodiment, a circumferential gap is provided between the auxiliary exhaust valve core 3 and the inner wall of the auxiliary exhaust section 112. When the auxiliary exhaust valve core 3 is in the first state, the second sealing ring 318 is located in the circumferential gap between the auxiliary exhaust valve core 3 and the inner wall of the auxiliary exhaust section 112 and is placed between the third working port C and the auxiliary exhaust port S to perform an in-hole seal. When the auxiliary exhaust valve core 3 is in the second state, the first sealing ring 317 is located in the circumferential gap between the inner wall of the auxiliary exhaust section 112 and the auxiliary exhaust valve core 3 and is placed between the fourth working port D and the auxiliary exhaust port S to form an in-hole seal. In this embodiment, the first sealing ring 317 and the second sealing ring 318 are respectively arranged on the left and right sides of the first connecting groove 312 and the second connecting groove 313 (relative to the left and right sides of the first connecting groove 312 and the second connecting groove 313). Fig.11 for the positions shown).

[0051] like Figure 3 As shown, when the auxiliary exhaust valve core 3 is in the first state, the second sealing ring 318 and the second connecting groove 313 are both located in the auxiliary exhaust section 112 and are placed on the right side of the auxiliary exhaust port S. The outer wall is pressed against the inner wall of the auxiliary exhaust section 112, and the second sealing ring 318 performs the inner hole sealing. At the same time, the first sealing ring 317 is located in the first auxiliary push section 111, that is, there is a gap between the first sealing ring 317 and the inner wall of the first auxiliary push section 111, and the first connecting groove 312 is partially arranged in the first auxiliary push section 111. The auxiliary exhaust port S is connected to the first auxiliary push section 111 through the first connecting groove 312 and the annular gap channel of the first auxiliary push section 111, that is, the auxiliary exhaust port S is connected to the third working port C.

[0052] Similarly, if Figure 7 As shown, when the auxiliary exhaust valve core 3 is in the second state, the first sealing ring 317 and the first connecting groove 312 are located in the auxiliary exhaust section 112 and are both located on the left side of the auxiliary exhaust port S. The outer wall is pressed and contacted with the auxiliary exhaust section 112 and is located on the right side of the auxiliary exhaust port S. The first sealing ring 317 seals the hole; the second sealing ring 318 is located in the second auxiliary push section 113.

[0053] Continue to see Figure 3The blocking cover 4 includes a cover body 41 and a limiting column 42 disposed on the cover body 41. The limiting column 42 is used to limit the sliding of the auxiliary exhaust valve core 3 so that it is limited to the first state or the second state. Specifically, the cover body 41 seals the open end of the auxiliary exhaust chamber 11, and is detachably connected to the reversing valve body 1. The limiting column 42 extends into the auxiliary exhaust chamber 11 and limits the auxiliary exhaust valve core 3 through the end. Among them, the limiting posts 42 on one of the sealing covers 4 serve as the first limiting structure, which is used to limit the auxiliary exhaust valve core so that it is limited to connect the first working port with the outside world or the first working port with the reversing exhaust port; the limiting posts 42 on the other sealing cover 4 serve as the second limiting structure, which is used to limit the auxiliary exhaust valve core so that it is limited to connect the second working port with the outside world or the second working port with the reversing exhaust port; of course, other first limiting structures and second limiting structures may also be provided in the auxiliary exhaust chamber 11, such as a step limiting structure, a retaining spring, etc. to limit the auxiliary exhaust valve core 3. In this embodiment, no limitation is made to the limiting structure of the auxiliary exhaust valve core 3.

[0054] Continue to see Figure 3 The two ends of the reversing valve core 2 are provided with air control pistons 6, which slide synchronously with the reversing valve core 2; the two ends of the reversing working chamber 12 are provided with piston chambers 15 connected thereto, which are used to guide the sliding of the air control piston 6. The piston chamber 15 is connected with a breathing hole 16, which is used to discharge or inhale air when the air control piston 6 moves.

[0055] In this embodiment, the composite reversing valve is a double-sided gas-controlled reversing valve, that is, the two ends of the reversing working chamber 12 (such as Figure 3 The left and right ends (as shown in FIG. 1 ) are connected to a first control port Y1 and a second control port Y2 to control the direction of the reversing valve core 2. Figure 3 As shown, the two piston chambers 15 are connected to the first control port Y1 and the second control port Y2 respectively to control the intake and exhaust of the two piston chambers 15, thereby controlling the reversing valve core 2 and the two air control pistons 6 to slide synchronously to achieve reversing.

[0056] The working process of the compound reversing valve: When the second control port Y2 is inlet, the directional valve core 2 is placed at the leftmost end. Figure 3 As shown, the second working port B is connected to the main air inlet P and the first working port A is connected to the first reversing exhaust port R1, and the auxiliary exhaust valve core 3 is pushed to the left limit by the air pressure, that is, it is switched to the first state. At this time, the first working port A is connected to the auxiliary exhaust port S, and air is supplied to the second air cavity of the cylinder through the second working port B, and the exhaust of the first control port Y1 and the second control port Y2 are both open.

[0057] When the cylinder piston moves to the end, the mechanical valve at the corresponding end opens to control the air intake of the first control port Y1. Of course, other methods can also be used to control the air intake of the first control port Y1 when the cylinder piston moves to the end. When the first control port Y1 is inhaled, the air control piston 6 is pushed to the right, pushing the reversing valve core 2 to move to the right. When the reversing valve core 2 moves to the Figure 4 When the first working port A is shown as being closed to the first reversing exhaust port R1 and just connected to the main air inlet P, the exhaust of the second working port B has not yet been opened and pressure is maintained, so the auxiliary exhaust valve core 3 does not move. The intake air of the first working port A is discharged through the auxiliary exhaust port S, so that the reversing valve core 2 can continue to slide under the action of the intake air pressure at the first control port Y1, avoiding the reversing valve core 2 from being stuck, and ensuring that the reversing valve core 2 can move rightward to the right position, that is, when the first working port A is connected to the main air inlet P and the second working port B is connected to the second reversing exhaust port R2.

[0058] When the first working port A is connected to the main air inlet P and the second working port B is connected to the second reversing exhaust port R2, Figure 5 As shown, since there is air pressure on the left side of the auxiliary exhaust valve core 3 and no pressure on the right side, the auxiliary exhaust valve core 3 is pushed to the right to the limit position, that is, switched to the second state. At this time, the first working port A supplies air to the first air chamber of the cylinder, and the first control port Y1 is opened for exhaust.

[0059] When the cylinder piston moves to the other end, the mechanical valve at the corresponding end opens to control the air intake of the second control port Y2. Of course, other methods can also be used to control the air intake of the second control port Y2 when the cylinder piston moves to the end.

[0060] When air enters the second control port Y2, the air control piston 6 is pushed to move to the left, pushing the reversing valve core 2 to move to the left. Figure 6 When the second working port B is shown as being closed to the second reversing exhaust port R2 and just connected to the main air inlet P, since the exhaust of the first working port A has not yet been opened and pressure is maintained, the auxiliary exhaust valve core 3 does not move. The intake air of the second working port B is discharged through the auxiliary exhaust port S, so that the reversing valve core 2 can continue to slide under the action of the intake air pressure at the second control port Y2, avoiding the reversing valve core 2 from being stuck, and ensuring that the reversing valve core 2 can move to the left to the position, that is, when the second working port B is connected to the main air inlet P and the first working port A is connected to the first reversing exhaust port R1.

[0061] When the second working port B is connected with the main air inlet P and the first working port A is connected with the first reversing exhaust port R1, since there is air pressure on the right side of the auxiliary exhaust valve core 3 and no pressure on the left side, the auxiliary exhaust valve core 3 is pushed to the left to the limit position and switches to the first state. At this time, the first working port A is connected with the auxiliary exhaust port S, and air is supplied to the second air cavity of the cylinder through the second working port B, and the exhaust of the second control port Y2 is opened.

[0062] In another implementation of the auxiliary exhaust chamber 11 and the auxiliary exhaust valve core 3 in the present embodiment, the difference between this implementation and the previous implementation lies mainly in the coordination of the auxiliary exhaust chamber 11 and the auxiliary exhaust valve core 3, the number of auxiliary exhaust ports and their positional relationship with the third working port C and the fourth working port D. Other structures may refer to the previous embodiment, such as the connection method between the third working port C and the first working port A and the opening end of the connecting hole may also be provided with a plug.

[0063] like Fig.13 As shown, the auxiliary exhaust chamber 11 includes: a first exhaust section 114, an exhaust reversing section 115 and a second exhaust section 116 which are arranged in sequence; wherein the auxiliary exhaust valve core 3 is slidably arranged in the exhaust reversing section 115; a first auxiliary exhaust port S1 which is connected to the reversing exhaust port or the outside is provided on the cavity wall of the first exhaust section 114, and a second auxiliary exhaust port S2 which is connected to the reversing exhaust port or the outside is provided on the cavity wall of the second exhaust section 116; a third working port C which is connected to the first working port A and a fourth working port D which is connected to the second working port B are also provided on the cavity wall of the exhaust reversing section 115, so that the auxiliary exhaust valve core 3 can slide to the second state under the action of the intake pressure of the first working port A, or slide to the first state under the action of the intake pressure of the second working port B.

[0064] Specifically, the third working port C and the fourth working port D are respectively connected to the first exhaust section 114 and the second exhaust section 116; the auxiliary exhaust valve core 3 is slidably connected to the inner wall of the exhaust reversing section 115, and the third working port C and the fourth working port D are respectively connected to the first side (such as Fig.13 left side as shown), the second side (as shown Fig.14 The first working port A is connected to the main air inlet P and the second working port B is connected to the reversing exhaust port, the first side of the exhaust reversing section 115 is inlet and the second side of the exhaust reversing section 115 is outlet, so as to push the auxiliary exhaust valve core 3 to slide to the second state, that is, slide to the right to the second state, and connect the fourth working port D with the outside or the reversing exhaust port; and when the second working port B is connected to the main air inlet P and the first working port A is connected to the reversing exhaust port, the first side of the exhaust reversing section 115 is outlet and the second side of the exhaust reversing section 115 is inlet, so as to push the auxiliary exhaust valve core 32 to slide to the first state, that is, slide to the left to the second state as shown. Fig.12In the first state shown, the third working port C is connected to the outside or the reversing exhaust port. The radial size of the exhaust reversing section 115 is adapted to the auxiliary exhaust valve core 3 so as to be slidably connected to the auxiliary exhaust valve core 3. At the same time, an airtight seal can be formed between the two to cut off the first exhaust section 114 and the second exhaust section 116 on the left and right sides, thereby avoiding the connection between the first exhaust section 114 and the second exhaust section 116 on the left and right sides. In this embodiment, the first auxiliary exhaust port S1 and the second auxiliary exhaust port S2 are both connected to the outside, and can also be connected to the reversing exhaust port, and one of them is connected to the reversing exhaust port.

[0065] When the first working port A is connected to the main air inlet P and the second working port B is connected to the second reversing exhaust port R2, the gas entering the main air inlet P can be discharged from the first working port A into the first air cavity, and at the same time, it can also be discharged from the third working port C into the first end of the exhaust reversing section 115 (such as Fig.13 The left end as shown in the figure), and pushes the auxiliary exhaust valve core 3 to slide rightward to slide to the second state, and connects the fourth working port D and the second exhaust section 116 through the second auxiliary exhaust channel to connect the fourth working port D and the second auxiliary exhaust port S2. Through the reversing of the reversing valve core 2, the second working port B and the second reversing exhaust port R2 are connected, and the second auxiliary exhaust channel assists in connecting the second working port B with the outside world, which can assist in exhausting the second working port B, so as to assist in exhausting the second air cavity.

[0066] When the second working port B is connected to the main air inlet P and the first working port A is connected to the first reversing exhaust port R1, the gas entering the main air inlet P can be discharged from the second working port B into the second air cavity, and at the same time, it can also be discharged from the fourth working port D into the second end of the exhaust reversing section 115 (such as Fig.13 The auxiliary exhaust valve core 3 is pushed to slide to the left to slide to the first state, connecting the third working port C and the first auxiliary exhaust port S1, and then assisting the connection of the first working port A with the outside through the first auxiliary exhaust channel, that is, through the reversing of the reversing valve core 2, the first working port A is connected with the first reversing exhaust port R1, while the second auxiliary exhaust channel assists the connection of the first working port A with the outside, which can assist in exhausting the first working port A, so as to assist in exhausting the first air cavity.

[0067] In this embodiment, the first limiting portion 17 is provided on the reversing valve body 1 in the auxiliary exhaust chamber 11, which is used to limit and support the auxiliary exhaust valve core 3 so that the auxiliary exhaust valve core 3 is in a position as shown in FIG. Fig.13 The first state shown; a second limiting portion 18 is provided on the reversing valve body 1 in the auxiliary exhaust chamber 11, which is used to limit and support the auxiliary exhaust valve core 3 so that the auxiliary exhaust valve core 3 is in the second state.

[0068] Continue to see Fig.13 The auxiliary exhaust valve core 3 includes: a valve core body 321, and two valve core bodies 321 and 322, respectively disposed on both sides of the valve core body 321 (such as Fig.13 The first switching rod 322 and the second switching rod 323 are provided on the left and right sides (as shown); wherein the valve core body 321 can slide along the inner wall of the exhaust reversing section 115 and form an airtight seal with the inner wall of the exhaust reversing section 115; the first switching rod 322 is driven by the valve core body 321 to realize the on-off switching between the third working port C and the first auxiliary exhaust port S1; the second switching rod is driven by the valve core body to realize the on-off switching between the fourth working port D and the second auxiliary exhaust port S2.

[0069] Specifically, a first switching chamber 117 adapted to the first switching rod 322 is provided between the exhaust reversing section 115 and the first exhaust section 114, and the third working port C is provided on the chamber wall of the first switching chamber 117. The first switching rod 322 is slidably arranged in the first switching chamber 117, and a first gap is provided between the outer wall of the first switching rod 322 and the inner wall of the first switching chamber 117, which is used to connect the first exhaust section 114 and the third working port C to form a first auxiliary exhaust passage; a second switching chamber 118 adapted to the second switching rod 323 is provided between the exhaust reversing section 115 and the second exhaust section 116, and a fourth working port D is provided on the chamber wall of the second switching chamber 118. The second switching rod 323 is slidably arranged in the second switching chamber 118, and a second gap is provided between the outer wall of the second switching rod 323 and the inner wall of the second switching chamber 118, which is used to connect the second exhaust section 116 and the fourth working port D to form a second auxiliary exhaust passage. The third working port C is opened at the end of the first switching chamber 117 close to the exhaust reversing section 115, and the third working port C is adjacent to the right end of the first switching chamber 117 (relative to the Figure 8 The fourth working port D is opened at the end of the second switching chamber 118 close to the exhaust reversing section 115, and the fourth working port D is connected to the left end of the second switching chamber 118 (relative to the left end of the second switching chamber 118). Figure 8 as shown).

[0070] Furthermore, the axial dimension of the valve core body 321 (eg Fig.13 The length in the horizontal direction shown in FIG. 1 is smaller than the axial dimension of the exhaust reversing section 115 (such as Fig.13The length in the horizontal direction shown in the figure) enables the valve core body 321 to slide left and right in the exhaust reversing section 115. The radial dimension of the valve core body 321 is greater than the radial dimension of the first switching rod 322 and the second switching rod 323. The two end surfaces of the valve core body 321 form an action surface. The compressed gas coming in from the third working port C or the fourth working port D acts on the action surface to push the auxiliary exhaust valve core 3 to slide. The first switching chamber 117 and the second switching chamber 118 are respectively adapted to the first switching rod 322 and the second switching rod 323. The connection between the first switching rod 322 and the exhaust reversing section 115 forms a step structure, which can be used as a first limiting portion 17 to limit the limit position of the valve core body 321 sliding to the left. The connection between the second switching rod 323 and the exhaust reversing section 115 forms a step structure, which can be used as a second limiting portion 18 to limit the limit position of the valve core body 321 sliding to the right. The first switching rod 322 and the inner wall of the first switching chamber 117 may be gap-matched, forming a first gap therebetween, which may connect the first exhaust section 114 and the first end of the exhaust reversing section 115 to form a first auxiliary exhaust passage. The second switching rod 323 and the inner wall of the second switching chamber 118 may be gap-matched, forming a second gap therebetween, which may connect the second exhaust section 116 and the second end of the exhaust reversing section 115 to form a second auxiliary exhaust passage.

[0071] Continue to see Fig.13 The first switching rod 322 is sleeved with a third sealing ring 324, which can slide with the first switching rod 322 to realize the on-off switching between the third working port C and the first auxiliary exhaust port S1. The second switching rod 323 is sleeved with a fourth sealing ring 325, which can slide with the second switching rod 323 to realize the on-off switching between the fourth working port D and the second auxiliary exhaust port S2.

[0072] Specifically, when the auxiliary exhaust valve core 3 is in the second state, the third sealing ring 324 seals the first gap and cuts off the first auxiliary exhaust passage; when the auxiliary exhaust valve core 3 is in the first state, the fourth sealing ring 325 seals the second gap and cuts off the second auxiliary exhaust passage; the third sealing ring 324 is sleeved on the left end of the first switching rod 322, and the fourth sealing ring 325 is sleeved on the right end of the second switching rod 323. When the auxiliary exhaust valve core 3 is in the second state, the third sealing ring 324 slides into the first gap, seals the first gap and cuts off the first auxiliary exhaust passage, so as to cut off the communication between the first exhaust section 114 and the first end of the exhaust reversing section 115, that is, cuts off the third working port C and the first auxiliary exhaust port S1. The fourth sealing ring 325 slides into the second exhaust section 116 to ensure that the second gap connects the second exhaust section 116 and the second end of the exhaust reversing section 115 to form a second auxiliary exhaust passage; when the auxiliary exhaust valve core 3 is in the first state, the third sealing ring 324 slides into the first exhaust section 114 to ensure that the first gap connects the first exhaust section 114 and the first end of the exhaust reversing section 115 to form a first auxiliary exhaust passage, and the fourth sealing ring 325 is located in the second gap, which can seal the second gap and cut off the second auxiliary exhaust passage, so as to cut off the connection between the second exhaust section 116 and the second end of the exhaust reversing section 115, that is, to cut off the connection between the fourth working port D and the second auxiliary exhaust port S2.

[0073] like Fig.14 As shown, a fifth sealing ring 326 is provided on the valve core body 321 for sealing the gap between the outer wall of the valve core body 321 and the inner wall of the exhaust reversing section 115 , so as to form an airtight seal between the valve core body 321 and the inner wall of the exhaust reversing section 115 . Specifically, the fifth sealing ring 326 can be one or more. In this embodiment, two fifth sealing rings 326 are used as an example for explanation. The two fifth sealing rings 326 are respectively sleeved on the two ends of the valve core body 321, so that an airtight seal is formed between the valve core body 321 and the inner wall of the exhaust reversing section 115, and the connection between the first exhaust section 114 and the second exhaust section 116 is cut off, and the connection between the left and right ends of the exhaust reversing section 115 is cut off, that is, the connection between the third working port C and the fourth working port D is cut off. At the same time, it can ensure that the auxiliary exhaust valve core 3 can slide synchronously with the reversing valve core 2 relative to the reversing valve body 31, that is, when the reversing valve core 2 slides relative to the reversing valve body 31, the auxiliary exhaust valve core 3 moves synchronously with the reversing valve core 2, and the auxiliary exhaust valve core 3 can also slide relative to the reversing valve core 2.

[0074] In this embodiment, the working principle of the auxiliary exhaust valve core can refer to the previous embodiment, and the working principle of the auxiliary exhaust valve core in this embodiment will not be described in detail here.

[0075] In the present embodiment, the composite reversing valve is a double-sided air-controlled reversing valve, that is, the two ends of the reversing working chamber 12 are connected with a first control port Y1 and a second control port Y2; of course, the composite reversing valve can also be a spring-reset air-controlled reversing valve, for example, a control port is provided at the left end of the reversing working chamber 12, and a reset spring is provided at the right end of the reversing working chamber 12. When air is introduced into the control port, the reversing valve core 2 can move to the right and compress the reset spring until the reversing valve core 2 moves to the right until the first working port A is connected to the main air inlet port P and the second working port B is connected to the second reversing exhaust port R2. The air inlet of the control port can be closed, and the pressure at the left end of the reversing working chamber 12 is maintained, so that the reversing valve core 2 maintains its position unchanged. When the exhaust at the control port is opened, the reversing valve core 2 can move to the left under the reset force of the reset spring until the second working port B is connected to the main air inlet P and the first working port A is connected to the first reversing exhaust port R1. Therefore, the reversing principle of the reversing valve core 2 in the spring reset type air-controlled reversing valve is different from that of the double-sided air-controlled reversing valve, and other structures can refer to the double-sided air-controlled reversing valve. Of course, the composite reversing valve can also be the air-controlled reversing valve disclosed in China with the publication number CN119163771A, and the above auxiliary exhaust valve core 3 can be set on the air-controlled valve housing of the air-controlled reversing valve. The setting of the auxiliary exhaust valve core 3 can refer to the arrangement of the auxiliary exhaust valve core in the above-mentioned double-sided air-controlled reversing valve, and its structure and working principle are not described in detail here.

[0076] In summary, the reversing valve provided in this embodiment can switch the reversing valve core 2 in different states through the setting of the auxiliary exhaust valve core 3. When the main air inlet P is connected to the second working port B and the first working port A is connected to the reversing exhaust port, the auxiliary exhaust valve core 3 connects the first working port A with the outside or the first working port A with the reversing exhaust port, and the first working port A is assisted to exhaust, that is, the first air cavity is assisted to exhaust, so that the cylinder piston moves to the side where the second air cavity is located under the action of the air pressure in the first air cavity, so as to ensure that the cylinder piston can move. When the air inlet is in the air-intake port P and the air-intake port B is in the air-intake port A, the air inlet is in the air-intake port B, and the air inlet is in the air-intake port B. When the air inlet is in the air-intake port P and the air-intake port B is in the air-intake port A, the air inlet is in the air-intake port B, and the air inlet is in the air-intake port B. When the air inlet is in the air-intake port P and the air-intake port B is in the air-intake port A, the air inlet is in the air-intake port B, and the air inlet is in the air-intake port B. The tooling loses pressure, resulting in the workpiece not being clamped tightly, the tool hitting, and other phenomena; when the main air inlet P is connected to the first working port A and the second working port B is connected to the reversing exhaust port, the auxiliary exhaust valve core 3 connects the second working port B with the outside or the second working port B with the reversing exhaust port, and the second working port B is assisted to exhaust, that is, the first air cavity is assisted to exhaust, so that the cylinder piston moves to the side where the first air cavity is located under the action of the air pressure in the second air cavity, so as to ensure that the cylinder piston can move into place, so that the reversing valve core 2 can be reversed into place, and the reversing valve core 2 can be controlled to be in place. The directional valve core 2 is switched until the main air inlet P is connected to the second working port B and the first working port A is connected to the switching exhaust port. In particular, when the air source pressure drops or fluctuates greatly, the reversing valve 3 can be switched to a state where the main air inlet P is connected to the second working port B and the first working port A is connected to the switching exhaust port, that is, a state where the second air cavity is intaken and the first air cavity is exhausted, thereby avoiding the cylinder from getting stuck, that is, avoiding the cylinder piston from stopping moving and no longer outputting hydraulic pressure, resulting in loss of pressure on the tooling, resulting in the workpiece being loosely clamped, tool collision, and the like.

[0077] In particular, the auxiliary exhaust valve core 3 is arranged in the reversing valve body 1, which has a compact structure and does not require external pipelines for connection. It can avoid problems such as connection errors and cluttered pipelines caused by multiple external pipelines, and at the same time avoid leakage caused by poor pipeline connections, further avoiding the problem of the reversing valve being stuck.

[0078] Furthermore, the auxiliary exhaust valve core 3 is arranged in parallel with the reversing valve core 2, so that the auxiliary exhaust valve core 3 can be switched when the first working port A and the second working port B are inlet and outlet, further simplifying the structure of the composite reversing valve.

[0079] Hydraulic station embodiment: This embodiment also proposes a hydraulic station, which is provided with the above-mentioned composite reversing valve with auxiliary exhaust function. The specific implementation process of the composite reversing valve can be referred to the above description, and this embodiment will not be repeated here.

[0080] Since the composite reversing valve has the above-mentioned effects, the hydraulic station having the composite reversing valve also has corresponding technical effects.

[0081] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0082] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0083] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A composite reversing valve with auxiliary exhaust function, comprising a reversing valve body and a reversing valve core, wherein the reversing valve body is provided with a main air inlet, a first working port, a second working port and a reversing exhaust port, and the reversing valve core is slidably arranged in the reversing valve body and can be switched to a position where the main air inlet is connected to the first working port and the second working port is connected to the reversing exhaust port, or switched to a position where the main air inlet is connected to the second working port and the first working port is connected to the reversing exhaust port, characterized in that: An auxiliary exhaust chamber is provided in the valve body of the reversing valve, and an auxiliary exhaust valve core is provided in the auxiliary exhaust chamber; When the main air inlet is connected to the second working port and the first working port is connected to the reversing exhaust port, the auxiliary exhaust valve core connects the first working port with the outside world or the first working port with the reversing exhaust port; when the main air inlet is connected to the first working port and the second working port is connected to the reversing exhaust port, the auxiliary exhaust valve core connects the second working port with the outside world or the second working port with the reversing exhaust port.

2. The composite reversing valve according to claim 1, characterized in that: The auxiliary exhaust chamber comprises: a first auxiliary push section, an auxiliary exhaust section and a second auxiliary push section arranged in sequence; wherein, The first auxiliary pushing section and the second auxiliary pushing section are respectively connected to the first working port and the second working port, and the auxiliary exhaust section is connected to the outside or the auxiliary exhaust section is connected to the reversing exhaust port; The auxiliary exhaust valve core can be slidably arranged in the auxiliary exhaust section, and is used to slide to a first state in which the first auxiliary push section is connected to the auxiliary exhaust section under the action of air pressure in the second auxiliary push section, or to slide to a second state in which the second auxiliary push section is connected to the auxiliary exhaust section under the action of air pressure in the first auxiliary push section.

3. The composite reversing valve according to claim 2, characterized in that: A third working port for connecting to the first working port is opened on the cavity wall of the first auxiliary pushing section, a fourth working port for connecting to the second working port is opened on the cavity wall of the second auxiliary pushing section, and an auxiliary exhaust port for connecting to the outside or the reversing exhaust port is opened on the cavity wall of the auxiliary exhaust section.

4. The composite reversing valve according to claim 3, characterized in that: A first connecting channel is provided on the auxiliary exhaust valve core or the reversing valve body; when the auxiliary exhaust valve core is in a first state, the first connecting channel connects the auxiliary exhaust port and the first auxiliary push section to form a first auxiliary exhaust passage; when the auxiliary exhaust valve core is in a second state, the first connecting channel connects the auxiliary exhaust port and the second auxiliary push section to form a second auxiliary exhaust passage.

5. The composite reversing valve according to claim 4, characterized in that: A notch is provided at a middle position on the outer peripheral wall of the auxiliary exhaust valve core, and a gap channel communicating with the auxiliary exhaust port is formed between the notch and the inner wall of the auxiliary exhaust section; A first communicating groove and a second communicating groove, both of which are connected to the notch, are provided on both sides of the notch. When the auxiliary exhaust valve core is in a first state, the first communicating groove is connected to the first auxiliary push section, and the first communicating groove and the gap channel are combined to form the first auxiliary exhaust passage; when the auxiliary exhaust valve core is in a second state, the second communicating groove is connected to the second auxiliary push section, and the second communicating groove and the gap channel are combined to form the second auxiliary exhaust passage.

6. The composite reversing valve according to claim 5, characterized in that: The auxiliary exhaust valve core is sleeved with a first sealing ring and a second sealing ring; when the auxiliary exhaust valve core is in a first state, the second sealing ring and the first connecting groove are both located in the auxiliary exhaust section; when the auxiliary exhaust valve core is in a second state, the first sealing ring and the second connecting groove are both located in the auxiliary exhaust section.

7. The composite reversing valve according to claim 6, characterized in that: A circumferential gap is provided between the auxiliary exhaust valve core and the inner wall of the auxiliary exhaust section. When the auxiliary exhaust valve core is in a first state, the second sealing ring is located in the circumferential gap between the auxiliary exhaust valve core and the inner wall of the auxiliary exhaust section and is placed between the third working port and the auxiliary exhaust port to perform in-hole sealing; When the auxiliary exhaust valve core is in the second state, the first sealing ring is located in the circumferential gap between the auxiliary exhaust valve core and the auxiliary exhaust valve housing and is placed between the fourth working port and the auxiliary exhaust port to perform in-hole sealing.

8. The composite reversing valve according to any one of claims 1 to 7, characterized in that: When the reversing valve core is in a neutral state so that the first working port is inlet and the second working port is not exhausting, the auxiliary exhaust valve core connects the first working port with the outside or the first working port with the reversing exhaust port; When the reversing valve core is in a neutral state so that the second working port takes in air and the first working port does not exhaust air, the auxiliary exhaust valve core connects the second working port with the outside or the second working port with the reversing exhaust port.

9. The composite reversing valve according to any one of claims 1 to 7, characterized in that: A first limiting structure is provided in the auxiliary exhaust chamber, which is used to limit the auxiliary exhaust valve core so as to limit the auxiliary exhaust valve core to a position that connects the first working port with the outside or the first working port with the reversing exhaust port; A second limiting structure is provided in the auxiliary exhaust cavity for limiting the auxiliary exhaust valve core so as to limit the auxiliary exhaust valve core to connect the second working port with the outside or the second working port with the reversing exhaust port.

10. A hydraulic station comprising the composite reversing valve according to any one of claims 1 to 9.

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