Pneumatic anti-pollution high-pressure fluid switch valve

Abstract

The utility model discloses a pneumatic anti-pollution high-pressure fluid switch valve which comprises a valve body, a valve body pneumatic electromagnetic valve exhaust port R and a valve body pneumatic electromagnetic valve exhaust port S which are arranged side by side are arranged on the outer surface of the valve body, and a valve body pneumatic electromagnetic valve exhaust port P is arranged on the surface of the top of the valve body. A high-pressure fluid outlet is formed in the side face of the valve body, and a high-pressure fluid inlet is formed in the surface of the bottom of the valve body. According to the high-pressure fluid switch valve, the air cylinder rod of the air cylinder directly acts on the switch core, and the force for opening and closing the high-pressure fluid is only in direct proportion to the area of the air cylinder piston and the pressure of compressed air, so that the force for opening and closing the high-pressure fluid is greatly improved, and high pressure can be provided for the fluid; the pneumatic and compressed air source of the two-position five-way pneumatic electromagnetic directional valve is used for pushing the air cylinder rod to move, the closing action can be achieved, the designed high-pressure fluid switching valve can provide high pressure for fluid, and the opening and closing action can be stably achieved in the working condition of polluted oil.

Description

Technical Field

[0001] The utility model belongs to the technical field of fluid switching valves, and particularly relates to a pneumatic anti-pollution high-pressure fluid switching valve. Background Technique

[0002] Modern processing machine tools such as CNC machining centers, CNC lathes, multi-station machining platforms, multi-head tapping machines, and processing assembly lines all use high-pressure fluids such as coolant and cutting oil for auxiliary processing. Moreover, with the improvement of technical requirements, the pressure requirements for these fluids are getting higher and higher. When these machine tools are working, the high-pressure fluids need to cooperate with the processing technology to continuously repeat the opening and closing actions. Therefore, valves are needed to divide the high-pressure fluids into required paths and control the opening and closing of each path of high-pressure fluids.

[0003] Existing technologies are all improved from electromagnetic directional control valves using hydraulic oil as the medium. However, the basic technology of this valve is based on hydraulic electromagnetic directional control valves, which have very high requirements for the cleanliness of the medium and can only be used in low-pressure environments below 3 Mpa. Due to the usage characteristics of these machine tools themselves, the fluids often require higher pressures, and electromagnetic valves are often unable to handle them. Moreover, when these oil fluids are recycled, it is inevitable that a large amount of fine chips and powders will be mixed into the oil fluids and cannot be separated; even if they can be separated, it will cause adverse consequences such as a significant increase in cost and a decrease in production efficiency.

[0004] When the existing hydraulic electromagnetic directional control valve is in use, there are problems that it cannot provide high pressure for the fluid and stably realize the opening and closing actions under the working conditions of polluted oil fluids. Therefore, this application proposes a pneumatic anti-pollution high-pressure fluid switching valve. Content of the Utility Model

[0005] The purpose of the utility model is to provide a pneumatic anti-pollution high-pressure fluid switching valve to solve the problems that the traditional hydraulic electromagnetic directional control valve cannot provide high pressure for the fluid and stably realize the opening and closing actions under the working conditions of polluted oil fluids as mentioned in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A pneumatic anti-pollution high-pressure fluid switching valve, comprising

[0007] A valve body, on the outer surface of the valve body, there are arranged a valve body pneumatic solenoid valve exhaust R port and a valve body pneumatic solenoid valve exhaust S port side by side. On the top surface of the valve body, there is a valve body pneumatic solenoid valve exhaust P port. On the side of the valve body, there is a high-pressure fluid outlet. On the bottom surface of the valve body, there is a high-pressure fluid inlet. At one end of the high-pressure fluid outlet, there is a high-pressure fluid inlet and outlet connection hole. Inside the high-pressure fluid outlet, there is a protection component, and this protection component includes a bracket and a protection ring installed inside the high-pressure fluid outlet;

[0008] A gas-liquid distribution block installed on the bottom surface of the valve body. On the opposite outer surfaces of the gas-liquid distribution block, there are a high-pressure fluid inlet communicating with high-pressure fluid and a compressed air inlet communicating with compressed air.

[0009] A cylinder installed on the side of the valve body. On the cylinder, there is a cylinder rod inserted into the interior of the valve body and a switch core with one end connected to the cylinder rod. At the bottom of the cylinder, there are a cylinder A-port connection joint and a cylinder B-port connection joint, and a connecting rubber hose between the cylinder A-port and the B-port of the pneumatic solenoid valve for the cylinder A-port connection joint and a connecting rubber hose between the cylinder B-port and the A-port of the pneumatic solenoid valve for the cylinder B-port connection joint, which are respectively in corresponding communication.

[0010] A two-position five-way pneumatic electromagnetic reversing valve installed on the top surface of the valve body. On the two-position five-way pneumatic electromagnetic reversing valve, there are a pneumatic solenoid valve B-port and a pneumatic solenoid valve A-port respectively in communication with the corresponding connecting rubber hoses between the cylinder A-port and the B-port of the pneumatic solenoid valve and between the cylinder B-port and the A-port of the pneumatic solenoid valve. The valve body, the cylinder, the gas-liquid distribution block, and the two-position five-way pneumatic electromagnetic reversing valve are combined by conventional means, such as the method of bolt screwing connection, and the required quantity can be freely selected according to the number of fluid paths needed.

[0011] Preferably, on the bottom surface of the two-position five-way pneumatic electromagnetic reversing valve, there are an R hole, a P hole, and an S hole, which are respectively in communication and sealed with the exhaust R-port of the pneumatic solenoid valve of the valve body, the exhaust P-port of the pneumatic solenoid valve of the valve body, and the exhaust S-port of the pneumatic solenoid valve of the valve body.

[0012] In this application, the machine tool numerical control system controls the two-position five-way pneumatic electromagnetic reversing valve, the two-position five-way pneumatic electromagnetic reversing valve controls the cylinder, the cylinder controls the linear reciprocating motion of the switch core, and the switch core realizes the opening and closing actions of the high-pressure fluid. Since the solenoid valve does not directly control the switch core, the situation that the traditional hydraulic electromagnetic reversing valve has a small electromagnetic force and cannot control the high-pressure fluid is solved. In this application, the direct force of the cylinder rod acts on the switch core, and the force to switch the high-pressure fluid is only proportional to the piston area of the cylinder and the compressed air pressure. Therefore, the force to switch the high-pressure fluid is greatly improved. According to the pressure value of the high-pressure fluid, cylinders with different piston diameters can be selected to easily adapt to the pressure environment.

[0013] Preferably, on the bottom of the valve body and the gas-liquid distribution block, there is a mounting plate, and through the mounting plate, there are connecting bolts for locking the valve body and the gas-liquid distribution block between the mounting plate and the gas-liquid distribution block and the valve body.

[0014] Preferably, on the cylinder, there are connecting bolts for locking the cylinder and the valve body, and through the two-position five-way pneumatic electromagnetic reversing valve, there are connecting bolts for locking the pneumatic solenoid valve and the valve body.

[0015] Preferably, a cavity is provided inside the valve body. A high-pressure fluid inlet sealing connection channel of the gas-liquid distribution block, which communicates with the cavity of the valve body, is provided on the gas-liquid distribution block. A switch core sealing sleeve sleeving outside the switch core is provided in the cavity of the valve body. A sealing ring between the switch core and the sealing sleeve is provided outside the switch core sealing sleeve. A sealing sleeve between the sealing sleeve and the valve body, which sleeving outside the sealing ring between the switch core and the sealing sleeve, is provided inside the valve body. The above sealing adopts a high-pressure design with conventional technical means, and the maximum pressure can reach 31.5 Mpa, which is much higher than the fluid pressure required by most machine tools at present.

[0016] In this application, the structure of the traditional hydraulic electromagnetic reversing valve is precise. Slight impurities in the medium will cause faults such as spool jamming, and then burn out the electromagnetic coil. Moreover, the force generated by the electromagnetic coil directly connected to the switch core is small, and it cannot forcibly push the spool to work when the spool jams, which also increases the risk of jamming. However, the precision of the components involved in this patent does not need to be deliberately improved, so the cost is low; the design of the switch core sealing sleeve for sealing high-pressure fluid at the switch core cone, the sealing ring between the switch core and the sealing sleeve, and the sealing sleeve between the sealing sleeve and the valve body is not prone to jamming. Even if it jams, the operating force of the switch core is large and it can still work normally. Therefore, the structure is simple and the reliability is extremely strong.

[0017] Preferably, an exhaust hole communicating with the atmosphere is provided on the valve body. One end of the exhaust hole is provided with an exhaust hole connection hole, and the other end of the exhaust hole connection hole communicates with the tail mounting space of the switch core sealing sleeve.

[0018] Preferably, the bracket includes an outer ring pipe, a middle fixed column and a hollow inner protective ring. The protective ring and the inner protective ring are in a conical shape. The outer conical surface of the protective ring fits with the inner conical surface of the inner protective ring. One end of the switch core is in a conical shape. The inner conical surface of the protective ring fits with the outer conical shape of one end of the switch core. A sealing ring is provided inside the protective ring. The center of the sealing ring is set as a six-equal-sector fan structure, and a separation line D is provided between adjacent fan surfaces.

[0019] Preferably, a guide post is provided on the conical end of the switch core. A spreading mesh plate is sleeved on the other end of the guide post. The meshed spreading mesh plate is in a curved shape. A fixed ring and a protective pad attached to the surface of the fixed ring are provided inside one end of the high-pressure fluid outlet. A convex ring embedded in the protective pad is provided on the fixed ring. The inner conical surface of the conical protective pad fits with the outer conical surface of the switch core.

[0020] Compared with the prior art, the beneficial effects of the present utility model are:

[0021] In the high-pressure fluid switching valve of the present utility model, the cylinder rod of the cylinder directly acts on the switching core. The force for switching the high-pressure fluid is only proportional to the area of the cylinder piston and the compressed air pressure. Therefore, the force for switching the high-pressure fluid is greatly enhanced, and high pressure can be provided to the fluid. By using the pneumatic function of the two-position five-way pneumatic electromagnetic reversing valve, the compressed air source drives the movement of the cylinder rod, and the shutdown action can be achieved. The designed high-pressure fluid switching valve can provide high pressure to the fluid and stably achieve the opening and closing actions under the working conditions of contaminated oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the present utility model;

[0023] Figure 2 is a schematic right-view structural diagram of the cylinder of the present utility model;

[0024] Figure 3 of the present utility model Figure 2 is a schematic structural diagram in the A-A direction;

[0025] Figure 4 is a schematic principle structural diagram of the cylinder and the two-position five-way pneumatic electromagnetic reversing valve of the present utility model;

[0026] Figure 5 is a schematic cross-sectional structural diagram of the high-pressure fluid outlet of the present utility model;

[0027] Figure 6 of the present utility model Figure 5 is an enlarged structural diagram of part C;

[0028] Figure 7 of the present utility model Figure 5 is a schematic side-view structural diagram of the sealing ring;

[0029] Figure 8 of the present utility model Figure 5 is a schematic side-view structural diagram of the spreading mesh plate;

[0030] Figure 9 of the present utility model Figure 4 is an enlarged structural diagram of part G;

[0031] In the figure: 1. Valve body; 2. Cylinder; 3. Two-position five-way pneumatic electromagnetic directional control valve; 4. Air-liquid distribution block; 5. Mounting plate; 6. High-pressure fluid; 7. Compressed air; 1-1. Exhaust port R of the pneumatic solenoid valve of the valve body; 1-2. Exhaust port S of the pneumatic solenoid valve of the valve body; 1-3. High-pressure fluid outlet; 1-31. Bracket; 1-32. Protective ring; 1-33. Sealing ring; 1-34. Fixed ring; 1-341. Convex ring; 1-35. Protective pad; 1-4. Connection hole for high-pressure fluid inlet and outlet; 1-5. High-pressure fluid inlet; 1-6. Sealing sleeve for the switch core; 1-7. Sealing ring between the switch core and the sealing sleeve; 1-8. Sealing sleeve between the sealing sleeve and the valve body; 1-9. Exhaust hole; 1-10. Exhaust hole connection hole; 2-1. Connection joint for port A of the cylinder; 2-2. Connecting rubber hose between port A of the cylinder and port B of the pneumatic solenoid valve; 2-3. Connection joint for port B of the cylinder; 2-4. Connecting rubber hose between port B of the cylinder and port A of the pneumatic solenoid valve; 2-5. Switch core; 2-51. Guide post; 2-52. Expanding mesh plate; 2-6. Cylinder rod; 2-7. Connecting bolt between the cylinder and the valve body; 3-1. Port A of the pneumatic solenoid valve; 3-2. Port B of the pneumatic solenoid valve; 3-3. Connecting bolt between the pneumatic solenoid valve and the valve body; 4-1. High-pressure fluid inlet; 4-2. Compressed air inlet; 5-1. Connecting bolt between the mounting plate, the air-liquid distribution block and the valve body; 6-1. Sealed connection channel for the high-pressure fluid inlet of the air-liquid distribution block. Detailed implementation mode

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] Embodiment

[0034] Please refer to Figures 1 to 9, the present utility model provides a technical solution: a pneumatic anti-pollution high-pressure fluid switching valve, which includes a valve body 1. On the outer surface of the valve body 1, there are arranged side by side a valve body pneumatic solenoid valve exhaust R port 1-1 and a valve body pneumatic solenoid valve exhaust S port 1-2. The outlets of the valve body pneumatic solenoid valve exhaust R port 1-1 and the valve body pneumatic solenoid valve exhaust S port 1-2 are communicated with the atmosphere. On the top surface of the valve body 1, there is a valve body pneumatic solenoid valve exhaust P port 1-11. On the side of the valve body 1, there is a high-pressure fluid outlet 1-3. On the bottom surface of the valve body 1, there is a high-pressure fluid inlet 1-5. The high-pressure fluid inlet 1-5 is hermetically connected to the high-pressure fluid 6 through the high-pressure fluid inlet sealing connection channel 6-1 of the gas-liquid distribution block. The high-pressure fluid 6 first enters the high-pressure fluid inlet sealing connection channel 6-1 of the gas-liquid distribution block from the high-pressure fluid inlet 4-1, then enters the cavity inside the valve body 1 from the high-pressure fluid inlet 1-5, and finally flows out from the high-pressure fluid outlet 1-3. At one end of the high-pressure fluid outlet 1-3, there is a high-pressure fluid inlet and outlet connection hole 1-4. Inside the high-pressure fluid outlet 1-3, there is a protection component. This protection component includes a bracket 1-31 and a protection ring 1-32 installed inside the high-pressure fluid outlet 1-3. The bracket 1-31 and the high-pressure fluid outlet 1-3 are combined by conventional methods (such as strong bonding glue). The bracket 1-31 and the protection ring 1-32 are combined by conventional methods (such as heat melting). The protection ring 1-32 made of rubber material plays a buffering role. When the conical head end of the switch core 2-5 is inserted into the high-pressure fluid outlet 1-3, the protection ring 1-32 buffers to prevent the switch core 2-5 from colliding with the inner wall of the high-pressure fluid outlet 1-3, which may cause the distance between the high-pressure fluid outlet 1-3 and the switch core 2-5 to become larger, resulting in leakage. A gas-liquid distribution block 4 is installed on the bottom surface of the valve body 1. On the opposite outer surfaces of the gas-liquid distribution block 4, there are a high-pressure fluid inlet 4-1 communicated with the high-pressure fluid 6 and a compressed air inlet 4-2 communicated with the compressed air 7. A cylinder 2 is installed on the side of the valve body 1. The cylinder 2 is provided with a cylinder rod 2-6 inserted into the valve body 1 and a switch core 2-5 with one end connected to the cylinder rod 2-6. The switch core 2-5 and the cylinder rod 2-6 are combined by conventional methods, such as welding connection. At the bottom of the cylinder 2, there are a cylinder A port connection joint 2-1 and a cylinder B port connection joint 2-3, and a connecting rubber hose 2-2 between the cylinder A port and the pneumatic solenoid valve B port and a connecting rubber hose 2-4 between the cylinder B port and the pneumatic solenoid valve A port respectively corresponding to and communicating with the cylinder A port connection joint 2-1 and the cylinder B port connection joint 2-3, so that the cylinder 2 is internally communicated with the two-position five-way pneumatic electromagnetic reversing valve 3;The two-position five-way pneumatic electromagnetic reversing valve 3 is installed on the top surface of the valve body 1. The two-position five-way pneumatic electromagnetic reversing valve 3 is connected to the valve body 1 through the connecting bolts 2-7 between the cylinder and the valve body. The two-position five-way pneumatic electromagnetic reversing valve 3 is provided with a pneumatic solenoid valve B port 3-2 and a pneumatic solenoid valve A port 3-1 that are respectively communicated with the connecting rubber hoses 2-2 between the corresponding cylinder A port and the pneumatic solenoid valve B port and the connecting rubber hose 2-4 between the cylinder B port and the pneumatic solenoid valve A port. When the switch core 2-5 and the cylinder rod 2-6 move towards the high-pressure fluid outlet 1-3 and the high-pressure fluid inlet and outlet connection hole 1-4, that is, when the switch core 2-5 and the cylinder rod 2-6 move to the left, the tapered end of the switch core 2-5 is inserted into the high-pressure fluid outlet 1-3 to achieve the effect of sealing the orifice of the high-pressure fluid inlet and outlet connection hole 1-4. Conversely, when the switch core 2-5 and the cylinder rod 2-6 move away from the high-pressure fluid outlet 1-3 and the high-pressure fluid inlet and outlet connection hole 1-4, that is, when the switch core 2-5 and the cylinder rod 2-6 move to the right, the orifice of the high-pressure fluid inlet and outlet connection hole 1-4 is opened, and the high-pressure fluid outlet 1-3, the high-pressure fluid inlet and outlet connection hole 1-4, and the high-pressure fluid inlet 1-5 are communicated. The high-pressure fluid 6 flows through the communicated channels, and finally the high-pressure fluid 6 flows out from the high-pressure fluid outlet 1-3.;

[0035] In this embodiment, an R hole, a P hole, and an S hole are provided on the bottom surface of the two-position five-way pneumatic electromagnetic reversing valve 3. The R hole, the P hole, and the S hole are respectively communicated and sealed with the valve body pneumatic solenoid valve exhaust R port 1-1, the valve body pneumatic solenoid valve exhaust P port 1-11, and the valve body pneumatic solenoid valve exhaust S port 1-2, and the two-position five-way pneumatic electromagnetic reversing valve 3 is internally communicated with the valve body 1.

[0036] In this embodiment, a mounting plate 5 is provided on the bottoms of the valve body 1 and the gas-liquid distribution block 4. The mounting plate 5 is penetrated by a connecting bolt 5-1 between the mounting plate for locking the valve body 1 and the gas-liquid distribution block 4 and the valve body and the gas-liquid distribution block. The mounting plate 5 supports the valve body 1 and the gas-liquid distribution block 4, and the connecting bolt 5-1 between the mounting plate and the gas-liquid distribution block and the valve body firmly fixes the valve body 1 and the gas-liquid distribution block 4.

[0037] In this embodiment, a connecting bolt 2-7 between the cylinder and the valve body for locking the valve body 1 is provided on the cylinder 2, and a connecting bolt 3-3 between the pneumatic solenoid valve and the valve body for locking the valve body 1 is penetrated through the two-position five-way pneumatic electromagnetic reversing valve 3. The connecting bolt 2-7 between the cylinder and the valve body firmly fixes the valve body 1 and the cylinder 2.

[0038] In this embodiment, a cavity is provided inside the valve body 1. On the gas-liquid distribution block 4, there is a high-pressure fluid inlet sealing connection channel 6-1 of the gas-liquid distribution block that communicates with the cavity of the valve body 1. Inside the cavity of the valve body 1, there is a switch core sealing sleeve 1-6 sleeved outside the switch core 2-5. Outside the switch core sealing sleeve 1-6, there is a seal ring 1-7 between the switch core and the sealing sleeve. Inside the valve body 1, there is a sealing sleeve 1-8 between the sealing sleeve and the valve body sleeved outside the seal ring 1-7 between the switch core and the sealing sleeve. The provided switch core sealing sleeve 1-6, the seal ring 1-7 between the switch core and the sealing sleeve, and the sealing sleeve 1-8 between the sealing sleeve and the valve body play an anti-pollution and sealing effect, avoiding faults such as spool jamming caused by impurities in the fluid medium. The design of sealing the high-pressure fluid outside the switch core 2-5 is not prone to jamming. The above seals all adopt a high-pressure design, with a maximum pressure of up to 31.5 Mpa, which is much higher than the fluid pressure required by most current machine tools.

[0039] In this embodiment, an exhaust hole 1-9 communicating with the atmosphere is provided on the valve body 1. One end of the exhaust hole 1-9 is provided with an exhaust hole connection hole 1-10, and the other end of the exhaust hole connection hole 1-10 communicates with the tail installation space of the switch core sealing sleeve 1-6, which is conducive to exhaust.

[0040] In this embodiment, the bracket 1-31 includes an outer ring pipe, a middle fixing column, and a hollow inner protection ring. The protection ring 1-32 and the inner protection ring are in a conical shape. The outer conical surface of the protection ring 1-32 fits with the inner conical surface of the inner protection ring. One end of the switch core 2-5 is in a conical shape. The inner conical surface of the protection ring 1-32 fits with the outer conical shape of one end of the switch core 2-5. Inside the protection ring 1-32, there is a sealing ring 1-33. The center of the sealing ring 1-33 is set as a six-equal-sector fan structure. There is a separation line D between adjacent sectors. The protection ring 1-32 plays an effect of weakening the touching force. When the conical head end of the switch core 2-5 is inserted into the high-pressure fluid outlet 1-3 from the orifice of the high-pressure fluid inlet and outlet connection hole 1-4, the protection ring 1-32 weakens the touching force, making the switch core 2-5 in flexible contact with the high-pressure fluid outlet 1-3, avoiding direct rigid collision between the switch core 2-5 and the inner wall of the high-pressure fluid outlet 1-3, which may cause the distance between the high-pressure fluid outlet 1-3 and the switch core 2-5 to become larger, resulting in leakage.

[0041] In this embodiment, a guiding column 2-51 is provided at the conical end of the switch core 2-5. The guiding column 2-51 is welded to the switch core 2-5. A spreading mesh plate 2-52 is sleeved on the other end of the guiding column 2-51. The spreading mesh plate 2-52 is welded to the guiding column 2-51. The guiding column 2-51 penetrates through the center of the circular spreading mesh plate 2-52. The mesh-shaped spreading mesh plate 2-52 is in a bent shape. The guiding column 2-51 and the spreading mesh plate 2-52 move in the same direction as the switch core 2-5. When the switch core 2-5 moves to the right to open the high-pressure fluid outlet 1-3, the spreading mesh plate 2-52 spreads the sealing ring 1-33 without affecting the fluid flow. A fixing ring 1-34 and a protective pad 1-35 attached to the surface of the fixing ring 1-34 are provided inside one end of the high-pressure fluid outlet 1-3. A convex ring 1-341 embedded in the protective pad 1-35 is provided on the fixing ring 1-34. The inner conical surface of the conical protective pad 1-35 coincides with the outer conical surface of the switch core 2-5. When the switch core 2-5 moves and is inserted into the high-pressure fluid outlet 1-3, the outer surface of the switch core 2-5 coincides with the protective pad 1-35 and the protective ring 1-32, making the seal between the switch core 2-5 and the high-pressure fluid outlet 1-3 tight and preventing leakage.

[0042] The working principle and usage process of the present utility model are as follows:

[0043] When the machine tool issues a command and the power supply of the air cylinder 3 is turned on, the piston rod 2-6 of the air cylinder 3 moves under the action of force. At this time, the compressed air source between the compressed air 7 and the port A in the air cylinder 2 is connected. The compressed air source pushes the piston rod 2-6 to move to the right. The piston rod 2-6 drives the switch core 2-5 to move to the right until the left conical head of the switch core 2-5 opens the right orifice of the high-pressure fluid inlet and outlet connection hole 1-4. The high-pressure fluid outlet 1-3, the high-pressure fluid inlet and outlet connection hole 1-4, and the high-pressure fluid inlet 1-5 are connected. The high-pressure fluid outlet 1-3, the high-pressure fluid inlet and outlet connection hole 1-4, and the high-pressure fluid inlet 1-5 are connected to form a flow channel. The high-pressure fluid 6 flows through the connected flow channel. Finally, the high-pressure fluid 6 flows out from the high-pressure fluid outlet 1-3. Through the direct action of the piston rod 2-6 of the air cylinder 2 on the switch core 2-5, the force for switching the high-pressure fluid is only proportional to the piston area of the air cylinder 2 and the compressed air pressure. Therefore, the force for switching the high-pressure fluid is greatly increased, and high pressure can be provided to the fluid.

[0044] After the machine tool issues a command and cuts off the power supply of the five-port two-position pneumatic solenoid directional valve 3, the spool of the five-port two-position pneumatic solenoid directional valve 3 moves under the action of force, connecting the compressed air source between the compressed air 7 and the port B in the cylinder 2. The compressed air source pushes the cylinder rod 2-6 to move to the left, and the cylinder rod 2-6 drives the switch core 2-5 to move to the left until the left cone tip of the switch core 2-5 abuts against the right orifice of the high-pressure fluid inlet and outlet connection hole) 1-4. The high-pressure fluid outlet 1-3, the high-pressure fluid inlet and outlet connection hole 1-4 and the high-pressure fluid inlet 1-5 are closed, and the high-pressure fluid 6 and the high-pressure fluid outlet 1-3 are closed. By using the pneumatic action of the five-port two-position pneumatic solenoid directional valve 3, the shutdown action can be achieved;

[0045] When the switch core 2-5 moves and inserts into the high-pressure fluid outlet 1-3, the outer surface of the switch core 2-5 fits with the protective pad 1-35 and the protective ring 1-32, making the switch core 2-5 and the high-pressure fluid outlet 1-3 tightly sealed to avoid leakage.

[0046] Although the embodiments of the present invention have been shown and described (see the above detailed description), for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pneumatic anti-pollution high-pressure fluid switching valve, characterized in that: including a valve body (1), on the outer surface of the valve body (1), there are arranged side by side a valve body pneumatic solenoid valve exhaust R port (1-1) and a valve body pneumatic solenoid valve exhaust S port (1-2), on the top surface of the valve body (1), there is a valve body pneumatic solenoid valve exhaust P port (1-11), on the side of the valve body (1), there is a high-pressure fluid outlet (1-3), on the bottom surface of the valve body (1), there is a high-pressure fluid inlet (1-5), at one end of the high-pressure fluid outlet (1-3), there is a high-pressure fluid inlet and outlet connection hole (1-4), and inside the high-pressure fluid outlet (1-3), there is a protection assembly, which includes a bracket (1-31) and a protection ring (1-32) installed inside the high-pressure fluid outlet (1-3); a gas-liquid distribution block (4) installed on the bottom surface of the valve body (1), on the opposite outer surfaces of the gas-liquid distribution block (4), there are a high-pressure fluid inlet (4-1) communicating with the high-pressure fluid (6) and a compressed air inlet (4-2) communicating with the compressed air (7); a cylinder (2) installed on the side of the valve body (1), on the cylinder (2), there is a cylinder rod (2-6) inserted into the valve body (1) and a switch core (2-5) with one end connected to the cylinder rod (2-6), at the bottom of the cylinder (2), there are a cylinder A port connection joint (2-1) and a cylinder B port connection joint (2-3), and a connecting rubber hose (2-2) between the cylinder A port and the pneumatic solenoid valve B port and a connecting rubber hose (2-4) between the cylinder B port and the pneumatic solenoid valve A port respectively corresponding to and communicating with the cylinder A port connection joint (2-1) and the cylinder B port connection joint (2-3); a two-position five-way pneumatic electromagnetic reversing valve (3) installed on the top surface of the valve body (1), on the two-position five-way pneumatic electromagnetic reversing valve (3), there are a pneumatic solenoid valve B port (3-2) and a pneumatic solenoid valve A port (3-1) respectively communicating with the corresponding connecting rubber hose (2-2) between the cylinder A port and the pneumatic solenoid valve B port and the connecting rubber hose (2-4) between the cylinder B port and the pneumatic solenoid valve A port; 2. The pneumatic anti-pollution high-pressure fluid switching valve according to claim 1, characterized in that: on the bottom surface of the two-position five-way pneumatic electromagnetic reversing valve (3), there are an R hole, a P hole and an S hole, and the R hole, the P hole and the S hole are respectively communicated with and sealed to the valve body pneumatic solenoid valve exhaust R port (1-1), the valve body pneumatic solenoid valve exhaust P port (1-11), and the valve body pneumatic solenoid valve exhaust S port (1-2); 3. The pneumatic anti-pollution high-pressure fluid on-off valve according to claim 1, characterized in that: on the bottom of the valve body (1) and the gas-liquid distribution block (4), there is a mounting plate (5), and through the mounting plate (5), there is a connecting bolt (5-1) for locking the valve body (1) and the gas-liquid distribution block (4); 4. The pneumatic anti-pollution high-pressure fluid switching valve according to claim 1, wherein: on the cylinder (2), there is a connecting bolt (2-7) for locking the cylinder and the valve body of the valve body (1), and through the two-position five-way pneumatic electromagnetic reversing valve (3), there is a connecting bolt (3-3) for locking the pneumatic solenoid valve and the valve body of the valve body (1).

5. The pneumatic anti-pollution high-pressure fluid switching valve according to claim 1, characterized in that: The interior of the valve body (1) is provided with a cavity. The gas-liquid distribution block (4) is provided with a high-pressure fluid inlet sealing connection channel (6-1) of the gas-liquid distribution block that communicates with the cavity of the valve body (1). A switch core seal sleeve (1-6) sleeved outside the switch core (2-5) is arranged in the cavity of the valve body (1). A sealing ring (1-7) between the switch core and the seal sleeve is arranged outside the switch core seal sleeve (1-6). A seal sleeve between the seal sleeve and the valve body (1-8) sleeved outside the sealing ring (1-7) between the switch core and the seal sleeve is arranged in the valve body (1).

6. The pneumatic anti-pollution high-pressure fluid switching valve according to claim 5, characterized in that: An exhaust hole (1-9) communicating with the atmosphere is arranged on the valve body (1). One end of the exhaust hole (1-9) is provided with an exhaust hole connection hole (1-10). The other end of the exhaust hole connection hole (1-10) communicates with the tail mounting space of the switch core seal sleeve (1-6).

7. The pneumatic anti-pollution high-pressure fluid switching valve according to claim 1, characterized in that: The bracket (1-31) includes an outer ring pipe, a middle fixed column and a hollow inner protection ring. The protection ring (1-32) and the inner protection ring are in a conical shape. The outer conical surface of the protection ring (1-32) fits with the inner conical surface of the inner protection ring. One end of the switch core (2-5) is in a conical shape. The inner conical surface of the protection ring (1-32) fits with the outer conical shape of one end of the switch core (2-5). A sealing ring (1-33) is arranged inside the protection ring (1-32). The center of the sealing ring (1-33) is set as a six-equal-sector fan structure. A separation line D is arranged between adjacent sectors.

8. The pneumatic anti-pollution high-pressure fluid switching valve according to claim 7, characterized in that: A guide post (2-51) is arranged on the conical end of the switch core (2-5). A spread net plate (2-52) is sleeved on the other end of the guide post (2-51). The net-shaped spread net plate (2-52) is in a curved shape. A fixed ring (1-34) and a protection pad (1-35) attached to the surface of the fixed ring (1-34) are arranged inside one end of the high-pressure fluid outlet (1-3). A convex ring (1-341) embedded in the protection pad (1-35) is arranged on the fixed ring (1-34). The inner conical surface of the conical protection pad (1-35) fits with the outer conical surface of the switch core (2-5).

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