Composite reversing valve with auxiliary exhaust function and hydraulic station

Abstract

The utility model provides a composite reversing valve with 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, an auxiliary exhaust cavity is arranged in the reversing valve body, and the reversing exhaust port is communicated with the 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 port and the second working port are switched to be communicated with the outside in sequence through the auxiliary exhaust valve, so that auxiliary exhaust is carried out on the two air cavities of the air cylinder respectively, and blocking and stopping of the piston of the air cylinder are avoided.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic station technology, and more specifically, to a composite directional valve with auxiliary exhaust function and a hydraulic station having the composite directional valve. Background Technology

[0002] A hydraulic power unit 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 Figure 1 This is a schematic diagram of a hydraulic station provided in the prior art. As shown in the figure, the hydraulic station includes: a linked cylinder 1' and a hydraulic cylinder 2'; wherein, the cylinder end caps on both sides of cylinder 1' are respectively provided with a first reversing trigger device 5' and a second reversing trigger device 6', and cylinder 1' is connected to a reversing valve 3', with the air source connected to the air inlet of the first reversing trigger device 5', the second reversing trigger device 6', and the reversing valve 3'; the A' outlet of the reversing valve 3' is connected to one side of cylinder 1', and the B' outlet of the reversing valve 3' is connected to the other side of cylinder 1'. The air port is connected to the other side of cylinder 1'; the first reversing trigger device 5' is connected to the reversing valve 3' to control the reversing valve 3' to activate the A' outlet of the reversing valve 3', so that the A' outlet of the reversing valve 3' is connected to the P' 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 activate the B' outlet of the reversing valve 3', so that the B' outlet of the reversing valve 3' is connected to the P' inlet of the reversing valve 3'. The cylinder piston sides (e.g. Figure 1 The cylinder chambers on the left and right sides (as shown) are the first air chamber 11' and the second air chamber 12', respectively.

[0004] The working process of the above hydraulic station is as follows: When the pneumatic piston is located on the left side of cylinder 1', the first reversing trigger device 5' is triggered to open, pushing the reversing valve 3' to reverse. Compressed air enters cylinder 1' from the outlet A', specifically into the space to the left of the pneumatic piston, thus pushing the pneumatic piston to the right (the first reversing trigger device 5' is reset and cut off), causing the oil cylinder piston in cylinder 2' to move to the right; when the pneumatic piston moves to the right side of cylinder 1', the second reversing trigger device 6' is triggered to open, pushing the reversing valve 3' to reverse, and compressed air enters from the outlet A'. Air from outlet B enters cylinder 1' and the space to the right of the pneumatic piston, thus pushing the pneumatic piston to the left (the second reversing trigger device 6' is reset and cut off), which in turn drives the piston in cylinder 2' to the left, causing hydraulic oil to flow in and out. Cylinder 1' reciprocates to form a continuous hydraulic output. When the set pressure is reached, cylinder 1' stops moving to maintain a constant pressure. Cylinder 1' remains in a pressurized state and stops moving, thus no longer consuming compressed air. Compared with traditional hydraulic stations, this reduces energy consumption and heat generation, achieving energy saving.

[0005] In the factory operating environment, the aforementioned hydraulic station typically has an elastic spindle on the cylinder end cover. When the pneumatic piston moves to the end, it squeezes the spindle to move, triggering the reversing trigger device to switch the reversing valve, thereby reversing the cylinder piston. This cycle repeats, continuously supplying oil to the cylinder. 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. However, when the air source pressure drops or fluctuates significantly, such as when there are other air-using units (air guns, etc.) in the air line causing unstable air source pressure and lower supply pressure, the spindle cannot move to the trigger stroke, the reversing valve cannot switch normally, and the cylinder piston becomes stuck, resulting in the cylinder not continuously supplying oil. Utility Model Content

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

[0007] On one hand, this utility model proposes a composite reversing valve with auxiliary exhaust function. The composite reversing valve includes a reversing valve body and a reversing valve core that slides and switches within the reversing valve body. The reversing valve body is provided with a main air inlet, a first working port, a second working port, and a reversing exhaust port. The reversing valve core 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 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. The reversing valve body is provided with an auxiliary exhaust chamber, and the auxiliary exhaust valve core is provided within 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 to the outside or the first working port to 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 to the outside or the second working port to the reversing exhaust port.

[0008] Furthermore, in the aforementioned composite reversing valve, the auxiliary exhaust chamber includes: a first auxiliary push section, an auxiliary exhaust section, and a second auxiliary push section arranged sequentially; 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 to the reversing exhaust port; the auxiliary exhaust valve core is slidably disposed in the auxiliary exhaust section, and is used to slide to a first state where the first auxiliary push section and the auxiliary exhaust section are connected under the action of air pressure in the second auxiliary push section, or to slide to a second state where the second auxiliary push section and the auxiliary exhaust section are connected under the action of air pressure in the first auxiliary push section.

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

[0010] Furthermore, in the aforementioned composite directional control valve, the auxiliary exhaust valve core or the directional control valve body is provided with a first connecting channel; 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 aforementioned composite reversing valve, the outer peripheral wall of the auxiliary exhaust valve core has a notch at its middle position, and the notch can form a gap channel communicating with the auxiliary exhaust port between the notch and the inner wall of the auxiliary exhaust section; both sides of the notch have a first connecting groove and a second connecting groove communicating with the notch; 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 combine 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 combine to form the second auxiliary exhaust passage.

[0012] Furthermore, in the aforementioned composite directional valve, the auxiliary exhaust valve core is fitted with a first sealing ring and a second sealing ring; when the auxiliary exhaust valve core is in a first state, both the second sealing ring and the first communicating groove are located within the auxiliary exhaust section; when the auxiliary exhaust valve core is in a second state, both the first sealing ring and the second communicating groove are located within the auxiliary exhaust section.

[0013] Furthermore, in the aforementioned composite directional valve, a circumferential orifice 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 the first state, the second sealing ring is located within the circumferential orifice between the auxiliary exhaust valve core and the inner wall of the auxiliary exhaust section and is positioned between the third working port and the auxiliary exhaust port to perform an internal sealing. When the auxiliary exhaust valve core is in the second state, the first sealing ring is located within the circumferential orifice between the auxiliary exhaust valve core and the auxiliary exhaust valve housing and is positioned between the fourth working port and the auxiliary exhaust port to perform an internal sealing.

[0014] Furthermore, in the aforementioned composite reversing valve, the auxiliary exhaust chamber includes: a first exhaust section, an exhaust reversing section, and a second exhaust section arranged sequentially; wherein, the auxiliary exhaust valve core is slidably disposed within the exhaust reversing section; the cavity wall of the first exhaust section is provided with a first auxiliary exhaust port communicating with the reversing exhaust port or the outside, and the cavity wall of the second exhaust section is provided with a second auxiliary exhaust port communicating with the reversing exhaust port or the outside; the cavity wall of the exhaust reversing section is also provided with a third working port communicating with the first working port and a fourth working port communicating with the second working port, so that the auxiliary exhaust valve core can slide to a second state under the action of the intake pressure of the first working port, or slide to a first state under the action of the intake pressure of the second working port.

[0015] Furthermore, in the aforementioned composite reversing valve, the auxiliary exhaust chamber is provided with a first limiting structure for limiting the auxiliary exhaust valve core to connect the first working port to the outside or the first working port to the reversing exhaust port; the auxiliary exhaust chamber is provided with a second limiting structure for limiting the auxiliary exhaust valve core to connect the second working port to the outside or the second working port to the reversing exhaust port.

[0016] The composite reversing valve provided by this utility model can switch between different states of the reversing valve core by setting an 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 sequence, so as to perform auxiliary exhaust on the first working port and the second working port in sequence. 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 connects the first working port A to the outside or the first working port A to the reversing exhaust port, thus assisting in exhausting the first working port A. This assists in exhausting the first air chamber, causing the cylinder piston to move towards the second air chamber under the pressure of the air in the first air chamber. This ensures that the cylinder piston can move to its designated position, allowing the reversing valve core to switch to its designated position. The reversing valve core is controlled to switch until 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. Especially when the air source pressure drops or fluctuates significantly, the compound reversing valve can switch to the state 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, i.e., the first air chamber is inlet and the second air chamber is outlet. This prevents the cylinder from jamming, i.e., prevents the cylinder piston from stopping and no longer outputting hydraulic pressure, which could lead to the tooling losing pressure and causing the workpiece to be loosely clamped or to collide with the tool. 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 connects the second working port B to the outside or the second working port B to the reversing exhaust port, thus assisting in exhausting the second working port B, which in turn assists in exhausting the first air chamber. This causes the cylinder piston to move towards the side of the first air chamber under the action of the air pressure in the second air chamber, ensuring that the cylinder piston can move to the correct position. This allows the reversing valve core to be reversing to the correct position, controlling the reversing valve core to reversing until 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. Especially when the air source pressure drops or fluctuates greatly, the compound reversing valve can switch to the 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 reversing exhaust port, that is, the state where the second air chamber is inlet and the first air chamber is exhaust. This avoids the cylinder from getting stuck, that is, it avoids the cylinder piston from stopping moving and no longer outputting hydraulic pressure, which would cause the tooling to lose pressure and result in the workpiece not being clamped tightly or the tool hitting the workpiece.

[0017] In particular, the auxiliary exhaust valve core is located inside the directional valve body, which has a compact structure and does not require external pipeline connection. This avoids problems such as connection errors and messy pipelines caused by multiple external pipelines. At the same time, it can avoid leakage caused by poor pipeline connection and further avoid the problem of directional valve jamming.

[0018] Furthermore, the auxiliary exhaust valve core is arranged in parallel with the reversing valve core, allowing the auxiliary exhaust valve core to switch directions when the first working port and the second working port are used for intake and exhaust, which further simplifies the structure of the composite reversing valve.

[0019] On the other hand, this utility model also proposes a hydraulic station equipped with the aforementioned composite directional valve.

[0020] Because the composite directional valve has the above-mentioned effects, the hydraulic station with the composite directional valve also has the corresponding technical effects. Attached Figure Description

[0021] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0022] Figure 1 This is a structural schematic diagram of a hydraulic station provided in the prior art;

[0023] Figure 2 A schematic diagram of the structure of a composite directional valve in the prior art in a stuck state;

[0024] Figure 3 This is a schematic diagram of the structure of the composite reversing valve provided in an embodiment of the present utility model, wherein the valve core of the reversing valve is in the first inlet / outlet state, the second working port B is connected to the main inlet port P, and the first working port A is connected to the first reversing exhaust port R1.

[0025] Figure 4 This is a schematic diagram of the structure of the composite reversing valve provided in an embodiment of the present utility model, wherein the valve core of the reversing valve moves to the right to the position where the first working port air inlet is just opened and the second working port exhaust is closed;

[0026] Figure 5 for Figure 4 A magnified view of a section at point E in the middle;

[0027] Figure 6 for Figure 4 A magnified view of a section at point F in the middle;

[0028] Figure 7 This is a schematic diagram of the structure of the composite reversing valve provided in an embodiment of the present utility model. The valve core of the reversing valve is in the second inlet / outlet state, the first working port A is connected to the main inlet port P, and the second working port B is connected to the second reversing exhaust port R2.

[0029] Figure 8 This is a schematic diagram of the structure of the composite reversing valve provided in an embodiment of the present utility model, wherein the valve core of the reversing valve moves to the left to the position where the second working port air inlet is just opened and the first working port exhaust is closed.

[0030] Figure 9 for Figure 8A magnified view of a section at point M;

[0031] Figure 10 for Figure 8 A magnified view of a portion of point N in the middle;

[0032] Figure 11 A schematic diagram of the structure of the auxiliary exhaust valve core provided in this embodiment of the utility model;

[0033] Figure 12 A cross-sectional view of the auxiliary exhaust valve core provided in an embodiment of this utility model at the first or second connecting groove;

[0034] Figure 13 The following is a schematic diagram of the structure of a composite reversing valve provided in another embodiment of the present utility model, wherein the valve core of the reversing valve is in the first inlet / outlet state, the second working port B is connected to the main inlet port P, and the first working port A is connected to the first reversing exhaust port R1.

[0035] Figure 14 A schematic diagram of the structure of the auxiliary exhaust valve core provided in another embodiment of this utility model;

[0036] Explanation of reference numerals in the attached drawings: 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-Breath 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 cap, 41-cap body, 42-limiting post, 5-plug, 6-pneumatic 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 Implementation

[0037] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, embodiments and features of the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] Example of a compound directional valve:

[0039] As is well known in the art, in order to avoid simultaneous exhaust from both sides of the cylinder, the reversing valve 3' has the characteristic of first-in, then-out; that is, the connection port corresponding to the intake port is connected first, while the connection port corresponding to the exhaust port is connected with a delay.

[0040] like Figure 2 As shown, when the directional valve core is pushed to the right, that is, when port A' switches from intake to exhaust and port B' switches from exhaust to intake, if port B' closes for exhaust before port A' opens for intake and port B' just opens for intake (meaning port B' has just started to receive air), and both intake and exhaust at port A' are closed, the pressure in the chamber connected to port A' is higher. This causes pressure in both cylinders, leading to either the pilot valve corresponding to the chamber connected to port B' resetting and closing, or a decrease in air source pressure. This reduces the air pressure pushing the directional valve core to the right, causing the directional valve to jam. The jammed directional valve causes the cylinder piston to stop moving, resulting in no more hydraulic pressure output. The tooling loses pressure, leading to problems such as workpiece not being clamped tightly or tool collision.

[0041] See Figures 3 to 10 The figure illustrates a preferred structure of the composite directional valve provided in an embodiment of the present invention. As shown, the composite directional valve includes: a directional valve body 1, a directional valve core 2, and an auxiliary exhaust valve core 3.

[0042] The reversing valve core 2 slides within 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 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.

[0043] 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 located on the same side of the main intake port P (e.g.,Figure 3 (As shown on the left), the second working port B and the second reversing exhaust port R2 are located on the other side of the main intake port P (as shown on the left). Figure 3 (as shown on the right), to facilitate the connection between the corresponding working port and the reversing exhaust port, when the reversing valve core 2 is switched to the first inlet / outlet state (such as... Figure 3 When the state shown is reached, 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; when the reversing valve core 2 is switched to the first air inlet / outlet state (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; Figure 5 When in the state shown, 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 may be only one reversing exhaust port. This embodiment does not limit it in any way. For example, in the pneumatic reversing valve disclosed in Chinese Publication No. CN119163771A, there is only one reversing exhaust port. The reversing valve body 1 can be a cuboid structure. 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 located on the bottom wall of the reversing valve body 1 (relative to the bottom wall of the valve body 1). Figure 3 (As shown in the figure), of course, it can also be opened on other wall surfaces, and this embodiment does not limit it in any way. In this embodiment, the valve body 1 of the reversing valve is also provided with a reversing working chamber 12, and the valve core 2 of the reversing valve is slidably disposed in the reversing working chamber 12.

[0044] The reversing valve body 1 has an auxiliary exhaust chamber 11, and the auxiliary exhaust chamber 11 has an 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 to the outside or the reversing exhaust port. 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 to the outside or the reversing exhaust port.

[0045] Specifically, the auxiliary exhaust chamber 11 can be arranged parallel to the reversing working chamber 12, and both are along the length direction of the reversing valve body 1 (e.g., Figure 3 Arranged along the length direction shown. In this embodiment, to facilitate the processing of the auxiliary exhaust chamber 11, preferably, the auxiliary exhaust chamber 11 is a through-hole structure that penetrates the valve body 1 of the reversing valve, that is, the auxiliary exhaust chamber 11 is a cavity structure with openings at both ends, and both opening ends can be provided with sealing caps 4 to seal the opening ends of the auxiliary exhaust chamber 11.

[0046] In such Figure 3When the reversing valve core 2 is in the first inlet / outlet state, that is, when the second working port B is connected to the main inlet port 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 to the outside or connects the first working port A to the reversing exhaust port. For example, the auxiliary exhaust valve core 3 connects the first working port A to the outside or connects the first working port A to the first reversing exhaust port R1. In this embodiment, the auxiliary exhaust valve core 3 connecting the first working port A to the outside is used as an example. It can assist in exhausting the first working port A, and then assist in exhausting the first air chamber of the cylinder connected to the first working port A, so that the cylinder piston moves towards the side where the first air chamber is located under the action of the air pressure in the second air chamber, so as to ensure that the cylinder piston can move into place and trigger the first reversing trigger device, so as to control the reversing valve core 2 to slide to the right to reverse to the point where Figure 7 The arrangement of the first working port A, connected to the main intake port P, and the second working port B, connected to the reversing exhaust port, prevents the cylinder piston from jamming. In such a position... Figure 7 When the directional valve core shown is in the second inlet / outlet state, that is, when the first working port A is connected to the main inlet port P and the second working port B is connected to the second directional exhaust port R2, the auxiliary exhaust valve core 3 connects the second working port B to the outside or the second working port B to the directional exhaust port. For example, the auxiliary exhaust valve core 3 connects the second working port B to the outside or the second working port B to the second directional exhaust port R2 to assist exhaust from the second working port B, thereby assisting exhaust from the second air chamber of the cylinder connected to the second working port B. This causes the cylinder piston to move towards the side where the second air chamber is located under the action of the air pressure in the first air chamber, ensuring that the cylinder piston can move into position and trigger the second directional triggering device, so as to control the directional valve core 2 to slide to the left to switch to the second working port B. Figure 3 The position shown, where the second working port B is connected to the main air intake port P and the first working port A is connected to the reversing exhaust port, can prevent the cylinder piston from getting stuck.

[0047] In this embodiment, as Figure 3 As shown, from the moment the reversing valve core 2 switches to the point where the second working port B is connected to the main intake port P and the first working port A is connected to the first reversing exhaust port R1, the auxiliary exhaust valve core 3 can quickly switch to the point where... Figure 3 The diagram shows the state where the first working port A is connected to the outside; that is, from the moment the reversing valve core 2 is switched to its final position until the second working port B is connected to the main air intake port P and the first working port A is connected to the first reversing exhaust port R1, until the moment the reversing valve core 2 is switched to its final position until the first working port A is connected to the main air intake port P and the second working port B is connected to the second reversing exhaust port R2, the auxiliary exhaust valve core 3 is in a state where the first working port A is connected to the outside. In particular, when the reversing valve core 2 is in the neutral position, allowing air to enter through the first working port A and not exhausting through the second working port B, i.e.... Figure 4 andFigure 5 As shown, the first working port A is just connected to the main air intake port P, and as... Figure 4 and Figure 6 When the second working port B and the second reversing exhaust port R2 are not open, the auxiliary exhaust valve core 3 connects the first working port A to the outside or the first working port A to the reversing exhaust port. In this embodiment, the auxiliary exhaust valve core 3 is in the state of connecting the first working port A to the outside, which can discharge the intake air of the first working port A to avoid the intake air of the first working port A pressing the cylinder piston in the opposite direction. By assisted exhausting the first working port A through the auxiliary exhaust valve core 3, the first air chamber can be assisted in exhausting, so that the cylinder piston can continue to move to the left to ensure that the cylinder piston moves to the left and triggers the first reversing trigger device, thereby avoiding the reversing valve core 2 from getting stuck.

[0048] like Figure 7 As shown, from the moment the reversing valve core 2 slides to the point where the first working port A is connected to the main intake port P and the second working port B is connected to the second reversing exhaust port R2, the auxiliary exhaust valve core 3 can quickly reverse, reversing to the point where... Figure 7 The diagram shows the state where the second working port B is connected to the outside; that is, from the moment the reversing valve core 2 slides to the point where the first working port A is connected to the main air intake port P and the second working port B is connected to the second reversing exhaust port R2, until the moment the reversing valve core 2 slides to the point where the second working port B is connected to the main air intake port P and the first working port A is connected to the first reversing exhaust port R1, the auxiliary exhaust valve core 3 is always in the state where the second working port B is connected to the outside. In particular, when the reversing valve core 2 is in the neutral position, allowing air to enter through the second working port B and not exhausting through the first working port A, i.e. Figure 8 and Figure 9 As shown, the second working port B is just connected to the main air intake port P, and as... Figure 8 and Figure 10 As shown, when the first working port A and the first reversing exhaust port R1 are not open, the auxiliary exhaust valve core 3 connects the second working port B to the outside or the second working port B to the reversing exhaust port. When the auxiliary exhaust valve core 3 is in the state of connecting the second working port B to the outside, it can discharge the intake air of the second working port B to avoid the intake air of the second working port B pressing the cylinder piston in the opposite direction. By assisted exhausting the second working port B through the auxiliary exhaust valve core 3, the second air chamber can be assisted in exhausting the second air chamber, so that the cylinder piston can continue to move to the right to ensure that the cylinder piston moves to the right and triggers the second reversing trigger device, thereby avoiding the reversing valve core 2 from getting stuck.

[0049] In this embodiment, the reversing valve body 1 is further 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 intake port 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 is connected to the third working port C and the auxiliary exhaust port S; when the main air intake port 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 is connected to the fourth working port D and the auxiliary exhaust port S.

[0050] In this embodiment, one implementation of the auxiliary exhaust chamber 11 and the auxiliary exhaust valve core 3 is described below. Figure 3 , Figure 4 , Figure 7 and Figure 8 The auxiliary exhaust chamber 11 includes a first auxiliary push section 111, an auxiliary exhaust section 112, and a second auxiliary push section 113 arranged sequentially.

[0051] 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. The auxiliary exhaust section 113 is connected to the outside or to the reversing exhaust port. The auxiliary exhaust valve core 3 is slidably disposed in the auxiliary exhaust section 112.

[0052] Specifically, the first auxiliary push section 111, the auxiliary exhaust section 112, and the second auxiliary push section 113, from left to right (relative to...) Figure 3 (As shown in the diagram) The auxiliary exhaust section 112 is sequentially arranged to match the outer diameter of the auxiliary exhaust valve core 3, allowing the auxiliary exhaust valve core 3 to slide against the cavity wall of the auxiliary exhaust section 112. The auxiliary exhaust section 112 guides 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, enabling the intake and exhaust of the first auxiliary push section 111 and the second auxiliary push section 113, respectively. This allows the auxiliary exhaust valve core 3 to slide left and right, thus adjusting its position according to the intake and exhaust of the first working port A and the second working port B. The auxiliary exhaust section 113 is connected to the outside or to the reversing exhaust port. In this embodiment, the auxiliary exhaust section 113 is connected to the outside as an example. Of course, in other embodiments, the auxiliary exhaust section 113 may also be connected to the reversing exhaust port. This embodiment does not impose any limitations on it.

[0053] like Figure 3As shown, when the main air intake 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 intake 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.

[0054] Specifically, such as Figure 3 As shown, when the main air intake 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 chamber are both connected to the main air intake P through the second working port B, and the first air chamber and the first auxiliary push section 111 are both connected to the first reversing exhaust port R1 through the first working port A. Therefore, the second auxiliary push section 113 receives 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, which is 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 intake 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 chamber are both connected to the second reversing exhaust port R2 through the second working port B. The first air chamber and the first auxiliary push section 111 are both connected to the main air intake 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. Under the action of air pressure, the auxiliary exhaust valve core 3 slides to the right to the right end limit, which is the second state. The second auxiliary push section 113 is connected to the auxiliary exhaust section 112.

[0055] See also Figure 3 , Figure 4 , Figure 7 and Figure 8 The first auxiliary push section 111 has a third working port C for connecting to the first working port A on its cavity wall, the second auxiliary push section 113 has a fourth working port D for connecting to the second working port B on its cavity wall, and the auxiliary exhaust section 112 has an auxiliary exhaust port S for connecting to the outside or a reversing exhaust port on its cavity wall.

[0056] Specifically, the third working port C is connected to the first working port A through the second connecting channel 13, and the fourth working port D is connected to the second working port B through the third connecting channel 14. To facilitate the processing of the second connecting channel 13 and the third connecting channel 14, preferably, both the second connecting channel 13 and the third connecting channel 14 can be along the width direction of the directional valve body 1 (e.g., ...). Figure 3The vertically arranged through holes or blind holes, especially the second connecting channel 13 and the third connecting channel 14, are hole structures with open tops. The bottom ends of the second connecting channel 13 and the third connecting channel 14 can be connected to the first working port A and the second working port B, respectively. A plug 5 can be provided at the top to seal the open ends of the second connecting channel 13 and the third connecting channel 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. 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 method of the auxiliary exhaust port S.

[0057] In this embodiment, the auxiliary exhaust valve core 3 or the reversing valve body 1 is provided with a first connecting channel; when the auxiliary exhaust valve core 3 is in the first state, the first connecting channel connects the auxiliary exhaust port S and 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 and the second auxiliary push section 113 to form a second auxiliary exhaust passage.

[0058] See also Figure 3 , Figure 4 , Figure 7 , Figure 8 , Figure 11 and Figure 12 The auxiliary exhaust valve core 3 has a notch 311 at its middle position on the outer peripheral wall. The notch 311 can form a gap channel with the inner wall of the auxiliary exhaust section 112 and communicate with the auxiliary exhaust port S.

[0059] Specifically, the auxiliary exhaust valve core 3 has a notch 311 on its outer peripheral wall at the middle position of the auxiliary exhaust valve core 3, which is arranged around the 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 with the inner wall of the auxiliary exhaust section 112 that communicates with the auxiliary exhaust port S. The circumferential notch design allows the auxiliary exhaust valve core 3 to sequentially 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. 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 slide and connect 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 this annular gap channel (e.g., Figure 3The length of the small-diameter valve core 315 (as shown in the length direction) 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 to the auxiliary exhaust port S. That is, when the auxiliary exhaust valve core 3 slides to any position, the annular gap channel is always connected to the auxiliary exhaust port S, and the annular gap channel is not connected to the first auxiliary push section 111 or the second auxiliary push section 113.

[0060] See also Figure 3 , Figure 4 , Figure 7 , Figure 8 , Figure 11 and Figure 12 The notch 311 has a first connecting groove 312 and a second connecting groove 313 on both sides, 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 combine to form the 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 combine to form the second auxiliary exhaust passage.

[0061] Specifically, on both sides of the notch 311 on the auxiliary exhaust valve core 3 (such as...) Figure 11 The left and right sides shown are respectively provided with a first connecting groove 312 and a second connecting groove 313, and both the first connecting groove 312 and the second connecting groove 313 are connected to the notch 311; the first connecting groove 312 and the second connecting groove 313 are respectively provided on the first large diameter valve core 314 and the second large diameter valve core 316. There can be multiple first connecting grooves 312 and the second connecting groove 313, and they 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 used as an example for illustration. Other numbers can be used, and no limitation is made on them in this embodiment.

[0062] 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. It connects the first auxiliary push section 111 with the annular gap channel. The first connecting groove 312 and the annular gap channel combine to form the first auxiliary exhaust passage, realizing the connection between the auxiliary exhaust port S and the first auxiliary push section 111, and further realizing the connection between the auxiliary exhaust port S and the third working port C. This allows the intake air from the first working port A to flow from the second connecting channel 13 through the third working port C into the first auxiliary push section 111, and then from the first connecting groove 312 into the annular gap channel, and finally out from the auxiliary exhaust port S. Simultaneously, the second connecting groove 313 is entirely located within the auxiliary exhaust section 112, cutting off the connection with the second auxiliary push section 113.Figure 7 As 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. It can connect the second auxiliary push section 113 with the annular gap channel. The combination of the second auxiliary push section 113 and the annular gap channel forms the second auxiliary exhaust passage, realizing the connection between the auxiliary exhaust port S and the second auxiliary push section 113, and thus realizing the connection between the auxiliary exhaust port S and the fourth working port D. This allows the intake air of the second working port B to flow from the third connecting channel 14 through the fourth working port D into the second auxiliary push section 113, and then flow from the second connecting groove 313 into the annular gap channel, and finally be discharged from the auxiliary exhaust port S. At the same time, the first connecting groove 312 is entirely located in the first auxiliary push section 111, cutting off the connection with the first auxiliary push section 111.

[0063] In this embodiment, the arrangement of the first connecting groove 312 and the second connecting groove 313 makes the reversing sliding smoother and ensures the balance and stability of each cavity.

[0064] See also Figure 3 , Figure 4 , Figure 7 , Figure 8 , Figure 11 To prevent gas leakage on the cut-off side, preferably, the auxiliary exhaust valve core 3 is fitted with a first sealing ring 317 and a second sealing ring 318. 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 318 is located between the third working port C and the auxiliary exhaust port S, cutting off the first auxiliary exhaust passage.

[0065] Specifically, the first sealing ring 317 and the second sealing ring 318 can be respectively fitted onto the first large-diameter valve core 314 and the second large-diameter valve core 316. The first sealing ring 317 and the second sealing ring 318 can be adapted to the inner wall of the auxiliary exhaust section 112 to 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 inside 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 inside the auxiliary exhaust section 112.

[0066] In this embodiment, a circumferential orifice 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 orifice between the auxiliary exhaust valve core 3 and the inner wall of the auxiliary exhaust section 112 and is positioned between the third working port C and the auxiliary exhaust port S, performing an internal seal. When the auxiliary exhaust valve core 3 is in the second state, the first sealing ring 317 is located in the circumferential orifice between the inner wall of the auxiliary exhaust section 112 and the auxiliary exhaust valve core 3 and is positioned between the fourth working port D and the auxiliary exhaust port S, forming an internal seal. In this embodiment, the first sealing ring 317 and the second sealing ring 318 are respectively disposed on the left and right sides of the first connecting groove 312 and the second connecting groove 313 (relative to...). Figure 11 (Regarding the location shown).

[0067] 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 inside the auxiliary exhaust section 112 and positioned to the right of the auxiliary exhaust port S. The outer wall of the second sealing ring 318 presses against the inner wall of the auxiliary exhaust section 112, and the second sealing ring 318 performs an internal seal. At the same time, the first sealing ring 317 is located inside 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. The first connecting groove 312 is partially disposed inside 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.

[0068] Similarly, such as 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 placed on the left side of the auxiliary exhaust port S. The outer wall presses against the auxiliary exhaust section 112 and is placed on the right side of the auxiliary exhaust port S. The first sealing ring 317 performs internal sealing. The second sealing ring 318 is located in the second auxiliary push section 113.

[0069] See also Figure 3The sealing cap 4 includes a cap body 41 and a limiting post 42 disposed on the cap body 41. The limiting post 42 is used to limit the sliding of the auxiliary exhaust valve core 3, so as to limit it to a first state or a second state. Specifically, the cap body 41 seals the opening end of the auxiliary exhaust chamber 11 and is detachably connected to the reversing valve body 1. The limiting post 42 extends into the auxiliary exhaust chamber 11 and limits the auxiliary exhaust valve core 3 through its end. In this embodiment, the limiting post 42 on one of the sealing caps 4 serves as a first limiting structure, used to limit the auxiliary exhaust valve core to connect the first working port to the outside or the first working port to the reversing exhaust port; the limiting post 42 on the other sealing cap 4 serves as a second limiting structure, used to limit the auxiliary exhaust valve core to connect the second working port to the outside or the second working port to the reversing exhaust port; of course, other first and second limiting structures may also be provided in the auxiliary exhaust chamber 11, such as a stepped limiting structure, a retaining spring, etc., to limit the auxiliary exhaust valve core 3. In this embodiment, no limitation is made on the limiting structure of the auxiliary exhaust valve core 3.

[0070] See also Figure 3 The reversing valve core 2 has pneumatically controlled pistons 6 at both ends, which slide synchronously with the reversing valve core 2; both ends of the reversing working chamber 12 are provided with piston chambers 15 communicating with them, which are used to guide the sliding of the pneumatically controlled pistons 6. The piston chambers 15 are connected to breather holes 16, which are used to expel or draw in air when the pneumatically controlled pistons 6 move.

[0071] In this embodiment, the composite directional valve is a dual-sided pneumatically controlled directional valve, that is, both ends of the directional working chamber 12 (e.g., Figure 3 The left and right ends (as shown) are connected to a first control port Y1 and a second control port Y2 to control the switching of the directional 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, so as to control the intake and exhaust of the two piston chambers 15, thereby controlling the reversing valve core 2 and the two pneumatic pistons 6 to slide synchronously to achieve reversing.

[0072] The working process of this composite directional valve:

[0073] When the second control port Y2 receives air, causing the directional valve core 2 to be positioned at the leftmost end, as follows: Figure 3 As shown, the second working port B is connected to the main air intake port P and the first working port A is connected to the first reversing exhaust port R1. The auxiliary exhaust valve core 3 is pushed to the left limit by the air pressure, that is, switched to the first state. At this time, the first working port A is connected to the auxiliary exhaust port S, and the second air chamber of the cylinder is supplied with air through the second working port B. The exhaust of the first control port Y1 and the second control port Y2 is opened.

[0074] When the cylinder piston reaches its end, the corresponding mechanical valve opens to control air intake at the first control port Y1. Alternatively, other methods can be used to control air intake at the first control port Y1 when the cylinder piston reaches its end. When air enters the first control port Y1, the pneumatic piston 6 is pushed to the right, pushing the directional valve core 2 to the right. When the directional valve core 2 moves to... Figure 4 When the first working port A is closed to the first reversing exhaust port R1 and just connected to the main air intake port P, the auxiliary exhaust valve core 3 remains stationary because the second working port B has not yet opened for exhaust and pressure is maintained. The air intake at the first working port A is discharged through the auxiliary exhaust port S, allowing the reversing valve core 2 to slide continuously under the intake pressure at the first control port Y1, preventing the reversing valve core 2 from jamming and ensuring that the reversing valve core 2 can move to the right until the first working port A is connected to the main air intake port P and the second working port B is connected to the second reversing exhaust port R2.

[0075] When the first working port A is connected to the main intake port P and the second working port B is connected to the second reversing exhaust port R2, such as 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 opens for exhaust.

[0076] When the cylinder piston moves to the other end, the mechanical valve at the corresponding end opens to control the intake of air through the second control port Y2. Of course, other methods can also be used to control the intake of air through the second control port Y2 when the cylinder piston moves to the end.

[0077] When air enters through the second control port Y2, the pneumatic piston 6 is pushed to the left, which in turn pushes the directional valve core 2 to the left. When the directional valve core 2 moves to the position... Figure 6 When the second working port B is closed to the second reversing exhaust port R2 and just connected to the main air intake port P, the auxiliary exhaust valve core 3 remains stationary because the first working port A has not yet opened for exhaust and pressure is maintained. The air intake at the second working port B is discharged through the auxiliary exhaust port S, allowing the reversing valve core 2 to slide continuously under the intake pressure at the second control port Y2, preventing the reversing valve core 2 from jamming and ensuring that the reversing valve core 2 can move to the left, i.e., until the second working port B is connected to the main air intake port P and the first working port A is connected to the first reversing exhaust port R1.

[0078] When the second working port B is connected to the main intake port P and the first working port A is connected to the first reversing exhaust port R1, the auxiliary exhaust valve core 3 is pushed to the left to the limit position and switches to the first state because there is air pressure on the right side and no pressure on the left side. At this time, the first working port A is connected to the auxiliary exhaust port S, and air is supplied to the second air chamber of the cylinder through the second working port B. The exhaust of the second control port Y2 is opened.

[0079] In another embodiment of the auxiliary exhaust chamber 11 and the auxiliary exhaust valve core 3, the main difference between this embodiment and the previous embodiment lies in the cooperation between 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 can refer to the previous embodiment. For example, the connection method between the third working port C and the first working port A and the opening end of the connecting hole can also be provided with a plug.

[0080] like Figure 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 arranged sequentially; wherein, the auxiliary exhaust valve core 3 is slidably disposed in the exhaust reversing section 115; the cavity wall of the first exhaust section 114 is provided with a first auxiliary exhaust port S1 connecting to the reversing exhaust port or the outside, and the cavity wall of the second exhaust section 116 is provided with a second auxiliary exhaust port S2 connecting to the reversing exhaust port or the outside; the cavity wall of the exhaust reversing section 115 is also provided with a third working port C connecting to the first working port A and a fourth working port D connecting to the second working port B, 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.

[0081] 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 of the exhaust reversing section 115 (e.g., ...). Figure 13 (as shown on the left side), the second side (as shown on the right side) Figure 14 (As shown on the right) When the first working port A is connected to the main air intake port P and the second working port B is connected to the reversing exhaust port, air enters from the first side of the exhaust reversing section 115 and exits from the second side of the exhaust reversing section 115, thereby pushing the auxiliary exhaust valve core 3 to slide to the second state, that is, to slide to the right to the second state, connecting 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 intake port P and the first working port A is connected to the reversing exhaust port, air exits from the first side of the exhaust reversing section 115 and enters from the second side of the exhaust reversing section 115, thereby pushing the auxiliary exhaust valve core 32 to slide to the first state, that is, to slide to the left to the first state. Figure 12In the first state shown, the third working port C is connected to the outside or the reversing exhaust port. The radial dimension of the exhaust reversing section 115 is adapted to the auxiliary exhaust valve core 3, allowing for slidable connection. Simultaneously, an airtight seal is formed between the two to cut off the connection between the first exhaust section 114 and the second exhaust section 116 on both sides, preventing communication between them. In this embodiment, both the first auxiliary exhaust port S1 and the second auxiliary exhaust port S2 are connected to the outside, or they can be connected to the reversing exhaust port; one can be selectively connected to the reversing exhaust port.

[0082] When the first working port A is connected to the main air intake port P and the second working port B is connected to the second reversing exhaust port R2, the gas entering at the main air intake port P can be discharged into the first air chamber through the first working port A, and simultaneously discharged into the first end of the exhaust reversing section 115 through the third working port C (e.g., Figure 13 (as shown on the left end), and push the auxiliary exhaust valve core 3 to slide to the right to slide to the second state, and connect 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. By reversing the valve core 2, the second working port B and the second reversing exhaust port R2 are connected. At the same time, the second auxiliary exhaust channel assists in connecting the second working port B and the outside, and can assist in exhausting the second working port B to assist in exhausting the second air chamber.

[0083] When the second working port B is connected to the main air intake port P and the first working port A is connected to the first reversing exhaust port R1, the gas entering at the main air intake port P can be discharged into the second air chamber through the second working port B, and simultaneously discharged into the second end of the exhaust reversing section 115 through the fourth working port D (e.g., Figure 13 (as shown on the right end), and push the auxiliary exhaust valve core 3 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 in connecting 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 to the first reversing exhaust port R1, and at the same time, the second auxiliary exhaust channel assists in connecting 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 chamber.

[0084] In this embodiment, a first limiting part 17 is provided on the valve body 1 of the reversing valve within the auxiliary exhaust chamber 11, for limiting and supporting the auxiliary exhaust valve core 3, so that the auxiliary exhaust valve core 3 is in a position as described above. Figure 13 The first state is shown; the valve body 1 of the reversing valve is provided with a second limiting part 18 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.

[0085] See alsoFigure 13 The auxiliary exhaust valve core 3 includes: a valve core body 321, and valve cores respectively located on both sides of the valve core body 321 (e.g., ...). Figure 13 The first switching lever 322 and the second switching lever 323 (shown on the left and right sides); wherein, the valve core body 321 can slide along the inner wall of the exhaust reversing section 115 and form an air seal with the inner wall of the exhaust reversing section 115; the first switching lever 322 realizes the on / off switching between the third working port C and the first auxiliary exhaust port S1 under the action of the valve core body 321; the second switching lever realizes the on / off switching between the fourth working port D and the second auxiliary exhaust port S2 under the action of the valve core body.

[0086] Specifically, a first switching cavity 117 adapted to the first switching rod 322 is provided between the exhaust reversing section 115 and the first exhaust section 114. A third working port C is opened on the cavity wall of the first switching cavity 117. The first switching rod 322 is slidably disposed in the first switching cavity 117. Furthermore, there is a first gap between the outer wall of the first switching rod 322 and the inner wall of the first switching cavity 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 cavity 118 adapted to the second switching rod 323 is provided between the exhaust reversing section 115 and the second exhaust section 116. A fourth working port D is opened on the cavity wall of the second switching cavity 118. The second switching rod 323 is slidably disposed in the second switching cavity 118. Furthermore, there is a second gap between the outer wall of the second switching rod 323 and the inner wall of the second switching cavity 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 located at the end of the first switching chamber 117 near the exhaust reversing section 115, and the third working port C is located at the right end of the first switching chamber 117 (relative to the right end of the first switching chamber 117). Figure 8 The fourth working port D is connected to the end of the second switching chamber 118 near 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 in the image) they are connected.

[0087] Furthermore, the axial dimension of the valve core body 321 (such as...) Figure 13 The horizontal length shown is less than the axial dimension of the exhaust reversing section 115 (e.g., Figure 13The length in the horizontal direction shown is used to allow 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 larger than the radial dimensions of the first switching rod 322 and the second switching rod 323. The two end faces of the valve core body 321 form an action surface. Compressed gas entering from the third working port C or the fourth working port D acts on this action surface, pushing 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 stepped structure, which can serve as the first limiting part 17 to limit the extreme 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 stepped structure, which can serve as the second limiting part 18 to limit the extreme position of the valve core body 321 sliding to the right. The first switching rod 322 can be clearance-fitted with the inner wall of the first switching cavity 117, forming a first gap that connects 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 can be clearance-fitted with the inner wall of the second switching cavity 118, forming a second gap that connects the second exhaust section 116 and the second end of the exhaust reversing section 115 to form a second auxiliary exhaust passage.

[0088] See also Figure 13 A third sealing ring 324 is fitted onto the first switching rod 322. The third sealing ring 324 can slide with the first switching rod 322 to switch the connection between the third working port C and the first auxiliary exhaust port S1. A fourth sealing ring 325 is fitted onto the second switching rod 323. The fourth sealing ring 325 can slide with the second switching rod 323 to switch the connection between the fourth working port D and the second auxiliary exhaust port S2.

[0089] 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, sealing the first gap and cutting off the first auxiliary exhaust passage, thereby cutting off the connection between the first exhaust section 114 and the first end of the exhaust reversing section 115, that is, cutting off the connection between the third working port C and the first auxiliary exhaust port S1. When the second gap is connected, 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. The fourth sealing ring 325 is located in the second gap and can seal the second gap to cut off the second auxiliary exhaust passage, thereby cutting off the connection between the second exhaust section 116 and the second end of the exhaust reversing section 115, that is, cutting off the connection between the fourth working port D and the second auxiliary exhaust port S2.

[0090] like Figure 14 As shown, a fifth sealing ring 326 is provided on the valve core body 321 to seal 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 air seal between the valve core body 321 and the inner wall of the exhaust reversing section 115. Specifically, there can be one or more fifth sealing rings 326. In this embodiment, two fifth sealing rings 326 are used as an example. The two fifth sealing rings 326 are respectively sleeved on both ends of the valve core body 321, which can form an air seal between the valve core body 321 and the inner wall of the exhaust reversing section 115. This can cut off the connection between the first exhaust section 114 and the second exhaust section 116, and cut off the connection between the left and right ends of the exhaust reversing section 115, that is, cut off the connection between the third working port C and the fourth working port D. 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. In addition, the auxiliary exhaust valve core 3 can also slide relative to the reversing valve core 2.

[0091] In this embodiment, the working principle of the auxiliary exhaust valve core can be referred to in the previous embodiment, and the working principle of the auxiliary exhaust valve core in this embodiment will not be described again here.

[0092] In this embodiment, the composite directional valve is a dual-sided pneumatically controlled directional valve, that is, the two ends of the directional working chamber 12 are connected to the first control port Y1 and the second control port Y2. Of course, the composite directional valve can also be a spring-reset pneumatically controlled directional valve. For example, the left end of the directional working chamber 12 is provided with a control port, and the right end of the directional working chamber 12 is provided with a reset spring. When air enters through the control port, the directional valve core 2 can move to the right and compress the reset spring until the directional valve core 2 moves to the right until the first working port A is connected to the main air inlet P and the second working port B is connected to the second directional exhaust port R2. The air inlet through the control port can be closed, and the pressure at the left end of the directional working chamber 12 is maintained, so that the directional valve core 2 remains in a fixed position. When the control port exhaust is opened, the reversing valve core 2 can move to the left under the return force of the return 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-return pneumatic reversing valve is different from that of the double-sided pneumatic reversing valve. Other structures can be referred to the double-sided pneumatic reversing valve. Of course, this composite reversing valve can also be the pneumatic reversing valve disclosed in Chinese publication number CN119163771A. The above-mentioned auxiliary exhaust valve core 3 can be set on the pneumatic control valve body of the pneumatic reversing valve. The setting of the auxiliary exhaust valve core 3 can be referred to the arrangement of the auxiliary exhaust valve core in the above-mentioned double-sided pneumatic reversing valve. Its structure and working principle will not be described in detail here.

[0093] In summary, the reversing valve provided in this embodiment, through the setting of the auxiliary exhaust valve core 3, can switch between different states of the reversing valve core 2. When the main intake port 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 to the outside or the first working port A to the reversing exhaust port, thus assisting in exhausting the first working port A. This assists in exhausting the first air chamber, thereby causing the cylinder piston to move towards the side where the second air chamber is located under the action of the air pressure in the first air chamber, ensuring that the cylinder piston can operate. The valve core 2 is moved to the correct position, allowing it to switch to the correct position until 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. This is especially important when the air source pressure drops or fluctuates significantly. The reversing valve can switch to the state 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, i.e., the first air chamber is receiving air and the second air chamber is venting air. This prevents the cylinder from jamming, i.e., prevents the cylinder piston from stopping and thus ceasing hydraulic pressure output. This can lead to a loss of pressure in the tooling, causing the workpiece to become loosely clamped or to collide with the tool. 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 to the outside or the second working port B to the reversing exhaust port, thus providing auxiliary exhaust to the second working port B. This auxiliary exhaust to the first air chamber causes the cylinder piston to move towards the side of the first air chamber under the action of the air pressure in the second air chamber, ensuring that the cylinder piston can move into position. This allows the reversing valve core 2 to be reversing into position, controlling the reversing valve. The 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. Especially when the air source pressure drops or fluctuates greatly, the switching valve 3 can switch to the 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, the second air chamber is inlet and the first air chamber is exhaust. This avoids the cylinder from getting stuck, that is, it avoids the cylinder piston from stopping moving and no longer outputting hydraulic pressure, which would cause the tooling to lose pressure and the workpiece to be not clamped tightly, or the tool to collide.

[0094] In particular, the auxiliary exhaust valve core 3 is set inside the directional valve body 1, which has a compact structure and does not require external pipeline connection. This avoids problems such as connection errors and messy pipelines caused by multiple external pipelines. At the same time, it can avoid leakage caused by poor pipeline connection and further avoid the problem of directional valve jamming.

[0095] 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 switch directions when the first working port A and the second working port B are used for intake and exhaust, which further simplifies the structure of the composite reversing valve.

[0096] Hydraulic power unit example:

[0097] This embodiment also proposes a hydraulic station equipped with the aforementioned composite directional valve with auxiliary exhaust function. The specific implementation process of the composite directional valve is described above and will not be repeated here.

[0098] Because the composite directional valve has the above-mentioned effects, the hydraulic station with the composite directional valve also has the corresponding technical effects.

[0099] It should be noted that in the description of this utility model, the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0100] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0101] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A composite directional control valve with auxiliary exhaust function, comprising a directional control valve body and a directional control valve core, wherein the directional control valve body is provided with a main air inlet, a first working port, a second working port, and a directional exhaust port, and the directional control valve core is slidably disposed within the directional control valve body and is capable of switching to a position where the main air inlet communicates with the first working port and the second working port communicates with the directional exhaust port, or switching to a position where the main air inlet communicates with the second working port and the first working port communicates with the directional exhaust port, characterized in that, The reversing valve body is provided with an auxiliary exhaust chamber, and the auxiliary exhaust chamber is provided with an auxiliary exhaust valve core; 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 is connected to the first working port and the outside or the first working port and the reversing exhaust port; when the main air inlet is connected to the first working port and the second working port and the reversing exhaust port, the auxiliary exhaust valve core is connected to the second working port and the outside or the second working port and the reversing exhaust port.

2. The composite directional valve according to claim 1, characterized in that, The auxiliary exhaust chamber includes: a first auxiliary push section, an auxiliary exhaust section, and a second auxiliary push section arranged sequentially; 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 disposed within the auxiliary exhaust section, and is used to slide to a first state where the first auxiliary push section and the auxiliary exhaust section are connected under the action of air pressure in the second auxiliary push section, or to a second state where the second auxiliary push section and the auxiliary exhaust section are connected under the action of air pressure in the first auxiliary push section.

3. The composite directional valve according to claim 2, characterized in that, The first auxiliary push section has a third working port on its cavity wall for connecting to the first working port, the second auxiliary push section has a fourth working port on its cavity wall for connecting to the second working port, and the auxiliary exhaust section has an auxiliary exhaust port on its cavity wall for connecting to the outside or the reversing exhaust port.

4. The composite directional valve according to claim 3, characterized in that, The auxiliary exhaust valve core or the reversing valve body is provided with a first connecting channel; 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 directional valve according to claim 4, characterized in that, The auxiliary exhaust valve core has a notch at its middle position on its outer peripheral wall, and the notch can form a gap channel communicating with the auxiliary exhaust port between itself and the inner wall of the auxiliary exhaust section. The notch has a first connecting groove and a second connecting groove on both sides, both of which are connected to the notch. When the auxiliary exhaust valve core is in the first state, the first connecting groove is connected to the first auxiliary push section, and the first connecting groove and the gap channel combine to form the first auxiliary exhaust passage. When the auxiliary exhaust valve core is in the second state, the second connecting groove is connected to the second auxiliary push section, and the second connecting groove and the gap channel combine to form the second auxiliary exhaust passage.

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

7. The composite directional valve according to claim 6, characterized in that, A circumferential orifice 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 the first state, the second sealing ring is located in the circumferential orifice 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 internal sealing. When the auxiliary exhaust valve core is in the second state, the first sealing ring is located in the circumferential hole 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 internal sealing.

8. The composite directional valve according to any one of claims 1 to 7, characterized in that, When the reversing valve core is in the neutral position, allowing air to enter through the first working port and not to exhaust through the second working port, the auxiliary exhaust valve core connects the first working port to the outside or the first working port to the reversing exhaust port. When the reversing valve core is in the neutral position, allowing air to enter the second working port and not venting from the first working port, the auxiliary exhaust valve core connects the second working port to the outside or the second working port to the reversing exhaust port.

9. The composite directional valve according to any one of claims 1 to 7, characterized in that, The auxiliary exhaust chamber is provided with a first limiting structure for limiting the auxiliary exhaust valve core, so that it is limited to connecting the first working port with the outside or the first working port with the reversing exhaust port. The auxiliary exhaust chamber is provided with a second limiting structure for limiting the auxiliary exhaust valve core, so that it is limited to connecting the second working port with the outside or the second working port with the reversing exhaust port.

10. A hydraulic station having a composite directional valve as described in any one of claims 1 to 9.

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