Conduction control valve and pneumatic motor

Abstract

An improvement scheme is provided for solving the problems that a traditional conduction control valve and a traditional pneumatic motor are large in size, limited in installation and use and the like. On the first hand, the conduction control valve is compact in structure, the upper shell and the lower shell are of a variable-diameter columnar structure and are in threaded or interference connection, the ejector pin is in a cross shape and is matched with a guide groove, accurate axial movement control is achieved, and the stability and reliability of a system are improved. And on the second aspect, the pneumatic motor is integrated with the conduction control valve, and the overall layout is optimized. A valve plate, a pilot gas inlet and the like in the pneumatic control valve mechanism are matched to achieve accurate reversing driving. A two-position five-way valve and a three-position five-way pneumatic control valve are combined, so that the control flexibility and precision are improved. A gas passage system is complex and reasonable in design, and different working condition requirements are met. In addition, the silencer reduces exhaust noise, the environmental protection performance of the product is improved, and the pneumatic motor is made to be suitable for more scenes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pneumatic motor, in particular to a pilot control valve and a pneumatic motor. BACKGROUND

[0002] In the application field of pneumatic motor, the pilot control valve is one of the key components, which mainly functions in flow control and pressure regulation. By precisely adjusting the position of the valve core, the pilot control valve can control the flow and pressure of the gas, thereby ensuring the stable operation of the pneumatic motor. However, the traditional pilot control valve has many problems in structural design, which leads to great limitations in actual application.

[0003] The traditional pilot control valve has a large volume, and the inlet and outlet gas modes adopt axial inlet and outlet, i.e. upper inlet and lower outlet or lower inlet and upper outlet, and the inlet is designed as a two-layer structure. This makes the axial height and radial size of the pilot control valve larger. When using such a traditional pilot control valve in a cylinder body, a corresponding accommodation space needs to be provided for it, which inevitably leads to an increase in the height and inner diameter of the cylinder body.

[0004] For example, Chinese patent CN 118622804 A discloses an integrated pneumatic motor. As can be seen from its structure, the pilot control valve in this patent is provided with two gas inlets, which results in a larger height of the pilot control valve, even extending out of the upper end surface of the cylinder body. At the same time, the valve body also needs to be provided with a flow channel corresponding to the pilot control valve. The larger the axial height of the pilot control valve, the higher the height of the valve body will inevitably be. This not only increases the overall size of the pneumatic motor, but also makes the pneumatic motor more space-limited during installation and use, reduces the use convenience and assembly convenience of the product, and limits the application of the pneumatic motor in some scenes with more stringent space requirements. Therefore, how to reduce the size of the pilot control valve and related components of the pneumatic motor, and reduce the axial height and radial size of the pneumatic motor, has become a technical problem to be solved. At the same time, a corresponding flow channel needs to be provided in the starting motor to adapt to the structure of the pilot control valve.

[0005] Therefore, we propose a pilot control valve and a pneumatic motor. SUMMARY

[0006] Based on this, it is necessary to provide a pilot control valve and a pneumatic motor in view of the technical problems that the traditional pilot control valve and pneumatic motor have a large volume, a large axial height and a large radial size, which leads to a large overall size of the pneumatic motor, space limitation during installation and use, low use convenience and assembly convenience, so as to reduce the size of the pilot control valve and related components of the pneumatic motor, reduce the axial height and radial size of the pneumatic motor, improve the use convenience and assembly convenience of the pneumatic motor, enhance the market competitiveness of the pneumatic motor, and meet the application requirements of more scenes with stringent space requirements.

[0007] The first aspect of the present application provides a conduction control valve, characterized in that comprising: an upper shell, the side wall of which is provided with two air holes perpendicular to the same horizontal plane, and the air holes are located in the middle of the axial direction of the upper shell; a lower shell connected with the upper shell, the end of which away from the upper shell is provided with a needle hole, and the side wall of the lower shell is provided with at least one exhaust hole, and the exhaust hole is located at the lower end of the side wall of the lower shell; a needle located in the lower shell, and one end of the needle extends outward through the needle hole; a second piston arranged in the upper shell and moving along the axial direction of the upper shell, and the second piston is in contact with the needle; an upper spring arranged in the upper shell and located between the second piston and the top wall of the upper shell; a lower spring arranged in the lower shell and located between the horizontal section of the needle and the second piston, the conduction control valve has a compact and reasonable structure, the variable-diameter cylindrical structure of the upper shell and the lower shell and the corresponding connection mode ensure the stability and sealing performance of the installation, preventing gas leakage. The "cross-shaped" design of the needle cooperates with the guide groove to realize accurate axial movement control, and the arrangement of the upper spring and the lower spring enables the second piston and the needle to be automatically reset, improving the stability and reliability of the system. The layout of the air holes and the exhaust holes makes the gas inlet and outlet and discharge smooth, and different gas control functions can be realized according to the position of the second piston, improving the flexibility and reliability of the system, and without electrical control, reducing the cost and maintenance difficulty, and improving the market competitiveness of the product.

[0008] In other embodiments, the upper shell and the lower shell are both variable-diameter cylindrical structures, which correspond to the shape of the accommodating cavity, improving the stability and sealing performance of the installation of the conduction control valve in the accommodating cavity, making the conduction control valve more reliable during operation, reducing problems such as gas leakage caused by unstable installation or poor sealing, and ensuring the normal operation of the system.

[0009] In other embodiments, the needle is "cross-shaped", the horizontal section of which is located inside the lower shell, and the second piston is provided with a guide groove corresponding to the needle on the side close to the needle. The "cross-shaped" design of the needle cooperates with the guide groove to enable the needle to move smoothly in the axial direction in the guide groove under the action of the second piston, realizing accurate control and ensuring that the conduction control valve can accurately control the flow of gas according to the position change of the needle, improving the control accuracy and reliability.

[0010] In other embodiments, the upper shell and the lower shell are connected by threads or interference, which ensures the firm connection between the upper and lower shells, effectively prevents gas leakage in the conduction control valve, improves the sealing performance of the conduction control valve, and ensures that the gas can flow along the designed path, thereby ensuring the stability and reliability of the system.

[0011] In a second aspect, the present application provides a pneumatic motor, characterized in that it comprises a pilot control valve according to any one of the above, and further comprises: a pneumatic motor body comprising a cylinder barrel and cylinder heads connected to the axial ends of the cylinder barrel, and a piston cavity provided in the cylinder barrel; the upper cylinder head and the lower cylinder head are each provided with a receiving cavity for accommodating the pilot control valve, and the receiving cavity is further provided with an exhaust flow channel near the exhaust hole, and the exhaust flow channel extends out of the pneumatic motor body; a pneumatic valve mechanism comprising a valve plate fixedly connected to the pneumatic motor body, the valve plate being provided with a pilot gas inlet and a motor gas inlet on both sides thereof for respectively conveying pilot gas and motor driving gas; two pilot gas channels extending in the direction of the valve plate are provided on the radial side wall of the receiving cavity, and the two pilot gas channels are provided on the same horizontal plane and correspond to the position of the gas hole of the pilot control valve; the valve plate is provided with a gas passage system for introducing pilot gas and motor driving gas to the corresponding positions to realize the reversing driving of the pneumatic motor, and the pneumatic motor is optimized in overall structural layout by integrating the pilot control valve. The cooperation design of the pneumatic motor body and the pilot control valve, as well as the settings of the valve plate, the pilot gas inlet and the motor gas inlet in the pneumatic valve mechanism, realize the accurate reversing control of the motor driving gas, can accurately control the movement direction and speed of the motor, and improve the reliability and flexibility of the system. The pilot gas channels correspond to the position of the gas hole of the pilot control valve, ensuring that the pilot gas can smoothly enter the pilot control valve to realize accurate control. The design of the gas passage system enables the pilot gas and the motor driving gas to flow along the set path, realizes the stable operation and efficient reversing of the pneumatic motor, and meets the performance requirements of the pneumatic motor in different application scenarios.

[0012] In other embodiments, the pneumatic motor body further comprises a first piston arranged in the piston cavity and reciprocating along the axial direction of the cylinder barrel, a piston rod connected to the first piston and moving along the axial direction of the cylinder barrel, and a piston hole corresponding to the piston rod provided on the cylinder barrel; the pilot control valve is installed in the receiving cavity in parallel with the cylinder axis, which enables the pneumatic motor to convert the pressure energy of the gas into mechanical energy, drives the load through the reciprocating movement of the first piston and the movement of the piston rod, and meets the basic functional requirements of the pneumatic motor. The pilot control valve is arranged in parallel with the cylinder axis, which facilitates the subsequent contact of the first piston with the pilot control valve, realizes accurate control, and ensures the stability and reliability of the operation of the pneumatic motor.

[0013] In other embodiments, the pneumatic valve mechanism further includes a first pneumatic reversing valve and a second pneumatic reversing valve mounted on the valve plate, the first pneumatic reversing valve is a two-position five-way valve, and the second pneumatic reversing valve is a three-position five-way pneumatic valve. Both the first and second pneumatic reversing valves are provided with two pneumatic control ports. The combination of the two-position five-way valve and the three-position five-way pneumatic valve allows the pneumatic motor to have higher flexibility and precision in control. The two-position five-way valve is mainly used for simple reversing control, while the three-position five-way pneumatic valve can realize more complex pneumatic control, such as mid-stop, one-way flow, etc., to meet the needs of different users in different application scenarios and improve the applicability and functionality of the pneumatic motor. The two pneumatic control ports allow the pneumatic reversing valve to realize reversing operation through pneumatic control signals without the need for electrical control, improving the safety and reliability of the system. At the same time, the size and direction of the pneumatic control signal can be adjusted according to actual needs to achieve precise control.

[0014] In other embodiments, the gas passage system includes two first pilot gas inlet passages and two first pilot gas outlet passages leading from the pilot gas inlet, and the gas passage system further includes a second pilot gas inlet passage, two intermediate gas passages, and two motor gas inlet passages leading from the pilot gas inlet. This complex and reasonable design of the gas passage system can accurately introduce pilot gas and motor driving gas to the corresponding position to realize precise reversing drive of the pneumatic motor. The design of two first pilot gas inlet and outlet passages improves the reliability and flexibility of the system, and when one of them fails, the other can still work normally to ensure stable operation of the system. The second pilot gas inlet passage, intermediate gas passage, and motor gas inlet passage allow the pneumatic motor to realize more complex pneumatic control to meet the operating requirements in different working conditions.

[0015] In other embodiments, the first pilot gas inlet passage is used to introduce pilot gas and communicate with the pilot gas passages on the upper and lower cylinder covers, and simultaneously communicate with the first pilot gas outlet passage, which communicates with the pilot end of the first gas control reversing valve to realize the reversing flow of the pilot gas; the second pilot gas inlet passage communicates with the gas inlet of the first gas control reversing valve; the intermediate gas passage is used to communicate the gas outlet of the first gas control reversing valve with the two pilot ends of the second gas control reversing valve; the two motor gas inlet passages are used to respectively communicate the gas outlets of the second gas control reversing valve with the piston cavity gas inlet passages on the upper and lower cylinder covers; the motor gas inlet is also connected with the gas inlet of the second gas control reversing valve to realize gas path reversing, and this connection mode between the passages forms a complete and efficient gas path control system. The cooperation of the first pilot gas inlet passage and the outlet passage realizes the introduction and reversing flow of the pilot gas, thereby controlling the action of the first gas control reversing valve. The second pilot gas inlet passage provides additional gas support for the first gas control reversing valve, improving the stability of the system. The intermediate gas passage realizes the connection of the gas path between the first gas control reversing valve and the second gas control reversing valve, so that the pneumatic motor can realize more complex gas path control. The two motor gas inlet passages provide stable gas support for the pneumatic motor, realizing the axial reciprocating drive of the first piston. The connection of the motor gas inlet with the second gas control reversing valve realizes gas path reversing, further improving the flexibility and reliability of the system, so that the pneumatic motor can realize different motion directions and speeds according to actual needs, meeting diversified application scenarios.

[0016] In other embodiments, a silencer is arranged at each of the two gas outlets of the first gas control reversing valve and the second gas control reversing valve, to reduce the exhaust noise. The arrangement of the silencer effectively reduces the noise generated by the pneumatic motor during the exhaust process, improves the quality of the working environment, and reduces the impact of noise on the health of workers. At the same time, it also meets the environmental protection requirements, reduces the impact of noise pollution on the surrounding environment, improves the environmental protection performance and social image of the product, so that the pneumatic motor can be applied in more scenes with strict noise requirements. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structural front view of the present application.

[0018] Figure 2 It is a Figure 1 sectional view of M-M.

[0019] Figure 3 It is a Figure 1 sectional view of H-H.

[0020] Figure 4 It is a Figure 3 sectional view of L-L.

[0021] Figure 5 Figure 2 is a sectional view along the line K-K of Figure 1. Figure 3

[0022] Figure 6 Figure 3 is a sectional view along the line J-J of Figure 1. Figure 3

[0023] Figure 7 Figure 4 is a sectional view along the line I-I of Figure 1. Figure 3

[0024] Figure 8 Figure 5 is a sectional view along the line N-N of Figure 1. Figure 1

[0025] Figure 9 Figure 6 is an enlarged view of the portion D of Figure 1. Figure 3

[0026] Figure 10 Figure 7 is a front view of the on-off control valve in the present application.

[0027] Figure 11 Figure 8 is a sectional view along the line E-E of Figure 7. Figure 10

[0028] Figure 9 is a pneumatic circuit diagram of the present application. Figure 12

[0029]

[0030] 1. Valve plate; 1-1, first pilot gas inlet passage; 1-2, second pilot gas inlet passage; 1-3, first pilot gas outlet passage; 1-4, intermediate gas passage; 1-5, motor gas inlet passage;

[0031] 2. Pneumatic motor body; 2-1, piston rod; 2-2, piston; 2-3, piston cavity inlet passage; 2-4, pilot gas passage; 2-5, piston cavity; 2-6, accommodating cavity; 2-7, exhaust flow channel;

[0032] 3. First pneumatic control reversing valve;

[0033] 4. Second pneumatic control reversing valve;

[0034] 5. Pilot gas inlet port;

[0035] 6. Motor inlet port;

[0036] 7. On-off control valve; 7-1, upper housing; 7-2, lower housing; 7-3, plunger; 7-5, second piston; 7-4, upper spring; 7-7, lower spring; 7-6, gas hole; 7-8, exhaust hole; 7-9, guide groove.

[0037] 8. Silencer;

[0038] 9. Pressure sensor.​​​​​​​ Detailed Implementation

[0039] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0040] Example 1

[0041] like Figures 10-11 As shown, this embodiment discloses a conduction control valve 7-7, whose structure includes an upper housing 7-1 and a lower housing 7-2 connected to each other. Both the upper and lower housings 7-1 and 7-2 are variable-diameter columnar structures, corresponding to the shape of the accommodating cavity 2-6. The upper and lower housings 7-1 and 7-2 are connected by interference fit or thread. A pin hole is opened at the end of the lower housing 7-2 away from the upper housing 7-1, and a push pin 7-3 is slidably inserted into the pin hole. The push pin 7-3 is "cross-shaped", and its horizontal section is located inside the lower housing 7-2. The upper housing 7-1 is provided with a [missing information - likely a type of valve] along the upper housing. The second piston 7-5, which reciprocates axially within the body 7-1, has a guide groove 7-9 corresponding to the ejector pin 7-3 on its side near the ejector pin 7-3, allowing the ejector pin 7-3 to move axially within the guide groove 7-9. An upper spring 7-4 is also installed inside the upper housing 7-1, positioned between the second piston 7-5 and the inner top wall of the upper housing 7-1, to reset the second piston 7-5. A lower spring 7-7 is installed inside the lower housing 7-2, positioned between the horizontal section of the ejector pin 7-3 and the second piston 7-5, to reset the ejector pin 7-3. The variable-diameter cylindrical structure of the upper housing 7-1 and lower housing 7-2 corresponds to the shape of the accommodating cavity 2-6, improving installation stability and sealing. The interference fit or threaded connection ensures a secure connection between the upper and lower housings 7-1 and 7-2, preventing gas leakage. The "cross-shaped" design of the ejector pin 7-3 allows for smooth axial movement within the guide groove 7-9, achieving precise control. The upper spring 7-4 and the lower spring 7-7 enable the second piston 7-5 and the ejector pin 7-3 to automatically reset during operation, improving the stability and reliability of the system.

[0042] The side wall of the upper shell 7-1 in the embodiment is provided with two air holes 7-6 perpendicular to the same horizontal plane. Both of the air holes 7-6 can be used as air inlet holes, or one as air inlet hole and the other as air outlet hole. The air holes 7-6 are located in the middle of the axial direction of the upper shell 7-1. The side wall of the lower shell 7-2 is provided with at least one air outlet hole 7-8, which is located at the lower end of the side wall of the lower shell 7-2. The design of the air holes 7-6 and the air outlet hole 7-8 enables the pilot control valve 7-7 to realize the inlet and outlet of gas and discharge, thereby controlling the flow direction of the gas. The design that the two air holes 7-6 are perpendicular to the same horizontal plane enables the gas to enter the upper shell 7-1 uniformly, thereby improving the flow efficiency of the gas. The design that the air outlet hole 7-8 is located at the lower end of the side wall of the lower shell 7-2 enables the gas to be discharged smoothly, thereby preventing the accumulation of gas in the valve and causing the pressure to rise. When the second piston 7-5 is located at the lowermost end of the upper shell 7-1, the two air holes 7-6 realize the inlet and outlet of the pilot gas. When the second piston 7-5 is located at the uppermost end of the upper shell 7-1, the pilot gas entering through the air hole 7-6 is discharged through the air outlet hole 7-8, thereby enabling the pilot control valve 7-7 to realize different gas control functions according to the position of the second piston 7-5, thereby improving the flexibility and reliability of the system. When the second piston 7-5 is located at the lowermost end of the upper shell 7-1, the air holes 7-6 realize the inlet and outlet of the pilot gas, thereby providing necessary gas support for the normal operation of the system. When the second piston 7-5 is located at the uppermost end of the upper shell 7-1, the pilot gas entering through the air hole 7-6 is discharged through the air outlet hole 7-8, thereby realizing the rapid discharge of the gas and preventing the accumulation of the gas in the valve and causing the pressure to rise.

[0043] Specifically, when the first piston 2-2 moves to the top or the bottom and abuts against the spool of the on-off control valve 7-7, the on-off control valve 7-7 is turned on, and when the first piston 2-2 does not contact the spool of the on-off control valve 7-7, the on-off control valve 7-7 is in an off state, without the need for electrical control, which is more simple and convenient. The control of the on-off control valve 7-7 is more simple and direct, without the need for a complex electrical control system. The movement of the first piston 2-2 directly controls the on and off of the on-off control valve 7-7, improving the response speed and reliability of the system. At the same time, the cost and maintenance difficulty of the system are reduced, and the market competitiveness of the product is improved. By adjusting the air inlet direction of the upper housing 7-1, the air hole 7-6 arranged along the axial top end of the upper housing 7-1 in the related art is adjusted to be arranged along the side wall of the upper housing 7-1, so that the upper housing 7-1 does not need to extend out of the top wall of the upper cylinder cover, and at the same time, the first pilot air inlet passage 1-1 on the valve plate 1-1 which communicates with the pilot air passage 2-4 can also be lowered, and the valve plate 1-1 does not need to extend out of the top wall of the upper cylinder cover, thereby reducing the height of the on-off control valve 7-7 and the height of the valve plate 1-1, so as to reduce the axial height of the starting motor; the structural layout of the pneumatic motor is optimized, the axial height thereof is reduced, and the pneumatic motor is more compact and light. At the same time, the installation flexibility and applicability of the pneumatic motor are improved, and it can adapt to more installation spaces and application scenarios. Moreover, by arranging two air holes 7-6 at the same horizontal plane, the spacing between the two air holes 7-6 can be reduced, thereby reducing the radial size of the on-off control valve 7-7.

[0044] Moreover, the spring in the related art is usually arranged in a groove inside the piston, resulting in an excessively large radial volume of the piston, and then an excessively large radial size of the housing. However, the present application adopts two springs arranged on the upper and lower sides of the second piston in the axial direction, which greatly reduces the radial occupied space while meeting the spring reset requirement, so as to reduce the radial size of the piston, and then reduce the radial size of the housing.

[0045] The structural layout of the on-off control valve 7-7 is further optimized, and the radial size thereof is reduced, so that the on-off control valve 7-7 is more compact and small. At the same time, the installation flexibility and applicability of the on-off control valve 7-7 are improved, and it can adapt to more installation spaces and application scenarios.

[0046] Embodiment Two

[0047] The embodiment discloses a pneumatic motor, which comprises a pneumatic motor body 2-2 and a gas control valve mechanism, the gas control valve mechanism comprises a valve plate 1-1 fixedly connected with the pneumatic motor body 2-2, a first gas control reversing valve 3-3 and a second gas control reversing valve 4-4 are installed on the valve plate 1-1, and a pilot gas inlet 5-5 and a motor gas inlet 6-6 are arranged on the two sides of the valve plate 1-1 respectively and used for conveying pilot gas and motor driving gas respectively; the pneumatic motor realizes reversing control of the motor driving gas through the gas control valve mechanism, so that the motion direction and speed of the motor are accurately controlled. Not only the reliability of the system is improved, but also the complexity of the control system is simplified. The pilot gas inlet 5-5 and the motor gas inlet 6-6 are respectively used for conveying gas with different functions, and the separated design helps to improve the safety and stability of the system.

[0048] The first gas control reversing valve 3-3 in the embodiment adopts a two-position five-way valve, and the second gas control reversing valve 4-4 adopts a three-position five-way gas control valve; the combination of the two-position five-way valve and the three-position five-way gas control valve makes the pneumatic motor have higher flexibility and accuracy in control. The two-position five-way valve is mainly used for simple reversing control,

[0049] In the embodiment, the two-position five-way valve in the related art is replaced by the three-position five-way gas control valve in the second gas control reversing valve 4-4, in the related art, the two-position five-way valve is provided with two working positions, when the valve core is moved and switched between the two positions, the phenomenon of jamming occurs, the spring is arranged in the two working positions of the original two-position five-way valve, and a third working position is formed in the middle of the two working positions, so that the two-position five-way valve is restored to the middle position to realize reset under the action of the spring when the two-position five-way valve is broken, manual processing is not needed, and the jamming phenomenon is reduced.

[0050] Therefore, more complex gas path control, such as middle position stop and unidirectional flow, can be realized. The combined design makes the pneumatic motor be able to adapt to more application scenarios and meet the needs of different users.

[0051] Specifically, the first gas control reversing valve 3-3 and the second gas control reversing valve 4-4 in the embodiment are both provided with two gas control ends, so that the gas control reversing valve can realize reversing operation through a gas control signal, without the need of electrical control, thereby improving the safety and reliability of the system. Meanwhile, the design of the gas control end also makes the control of the valve more flexible, the size and direction of the gas control signal can be adjusted according to actual needs, and accurate control is realized.

[0052] The pneumatic motor body 2-2 in this embodiment includes a cylinder and cylinder covers connected to the axial ends of the cylinder, a piston cavity 2-5 is arranged in the cylinder, and a first piston 2-2 reciprocatingly moves along the axial direction of the cylinder is arranged in the piston cavity 2-5, a piston rod 2-1 moving along the axial direction of the cylinder is connected to the first piston 2-2, and a piston hole corresponding to the piston rod 2-1 is arranged on the cylinder; such a structure enables the pneumatic motor to convert the pressure energy of the gas into mechanical energy, and drives the load through the reciprocating movement of the piston. The design of the cylinder and the cylinder cover ensures the sealing of the cylinder, prevents gas leakage, and improves the efficiency of the system. At the same time, the design of the piston rod 2-1 also enables the pneumatic motor to output a larger torque, meeting the demand of heavy load application.

[0053] The upper cylinder cover and the lower cylinder cover are both provided with a piston cavity intake passage 2-3 extending towards the valve plate 1-1; the design of the piston cavity intake passage 2-3 enables the gas to smoothly enter the piston cavity 2-5 and push the piston to move. Not only does it improve the flow efficiency of the gas, but also reduces the pressure loss of the gas, improving the overall performance of the system.

[0054] The upper cylinder cover and the lower cylinder cover are both provided with a containing cavity 2-6, and a pilot control valve 7-7 is arranged in the containing cavity 2-6. The containing cavity 2-6 is a variable-diameter cylindrical shape, and the axis of the containing cavity 2-6 is arranged in parallel with the axis of the cylinder. After the pilot control valve 7-7 is installed into the containing cavity 2-6, the pilot control valve 7-7 is also arranged in parallel with the axis of the cylinder, which facilitates the subsequent contact between the first piston 2-2 and the needle 7-3 of the pilot control valve 7-7. The design of the containing cavity 2-6 provides a stable installation position for the pilot control valve 7-7, ensuring the stability and reliability of the pilot control valve 7-7 during operation. At the same time, the variable-diameter cylindrical shape design also enables the containing cavity 2-6 to better adapt to the shape of the pilot control valve 7-7, improving the accuracy and efficiency of installation. The parallel arrangement of the pilot control valve 7-7 and the cylinder axis enables the first piston 2-2 to accurately contact the needle 7-3 of the pilot control valve 7-7 during movement, achieving precise control.

[0055] Two pilot gas passages 2-4 extending towards the valve plate 1-1 are arranged on the radial side wall of the containing cavity 2-6, and the two pilot gas passages 2-4 are arranged on the same horizontal plane and correspond to the inlet position of the pilot control valve 7-7; the design of the pilot gas passage 2-4 enables the pilot gas to smoothly enter the pilot control valve 7-7, achieving precise control. The design of the two pilot gas passages 2-4 arranged on the same horizontal plane improves the flow efficiency of the gas and reduces the pressure loss of the gas.

[0056] By adjusting the axial height and radial size of the on-off control valve 7-7, and also adjusting the height of the valve plate 1-1, the size of the accommodating cavity 2-6 and the size of the pneumatic motor body 2-2 are reduced, and finally the size of the pneumatic motor is reduced. By optimizing the structural layout of the on-off control valve 7-7 and the valve plate 1-1, the overall size of the pneumatic motor is reduced. This not only improves the installation flexibility and applicability of the pneumatic motor, but also reduces the manufacturing cost and transportation cost. At the same time, it also improves the market competitiveness of the pneumatic motor, and meets the user's demand for miniaturization and lightweight products.

[0057] The accommodating cavity 2-6 in the embodiment is provided with a sealing structure on the side close to the piston cavity 2-5, which can limit the flow of pilot gas into the piston cavity 2-5. The position close to the exhaust hole 7-8 of the accommodating cavity 2-6 is also provided with an exhaust flow channel 2-7, which extends out of the pneumatic motor body, and a control valve is arranged in the exhaust flow channel 2-7, which can realize the exhaust of the pilot gas in the on-off control valve 7-7. The design of the sealing structure ensures the sealing of the accommodating cavity 2-6, preventing the flow of pilot gas into the piston cavity 2-5, which causes the system pressure to be unstable. The design of the exhaust flow channel 2-7 and the control valve realizes the rapid discharge of the pilot gas in the on-off control valve 7-7, preventing the accumulation of gas in the valve, which causes the pressure to rise. It improves the stability and reliability of the system, and ensures the normal work of the pneumatic motor.

[0058] In the embodiment, at least two first pilot gas inlet channels 1-1 are arranged in the valve plate 1-1, which are led from the pilot gas inlet 5-5. The first pilot gas inlet channel 1-1 is provided with two ports, one of which is communicated with the pilot gas channel 2-4 on the upper (lower) cylinder cover; corresponding to the control of the upper (lower) on-off control valve 7-7; so that the pilot gas can enter the on-off control valve 7-7 through the gas path in the valve plate 1-1, realizing accurate control. The design of the two first pilot gas inlet channels 1-1 improves the reliability and flexibility of the system. When one of them fails, the other can still work normally, ensuring the stable operation of the system. The other port of the first pilot gas inlet channel 1-1 is communicated with the first pilot gas outlet channel 1-3, and the first pilot gas outlet channel 1-3 is communicated with the gas control end of the first gas control reversing valve 3-3, realizing the reversing flow of the pilot gas; so that the pilot gas can realize the reversing flow in the valve plate 1-1, thereby controlling the reversing operation of the first gas control reversing valve 3-3. It improves the flexibility and reliability of the system, so that the pneumatic motor can realize different motion directions and speeds according to actual needs.

[0059] The valve plate 1-1 is provided with a second pilot gas inlet passage 1-2 leading from the pilot gas inlet 5-5, which communicates with the gas inlet of the first gas-controlled reversing valve 3-3. The design of the second pilot gas inlet passage 1-2 provides additional gas support for the first gas-controlled reversing valve 3-3, improving the stability and reliability of the system. When the first pilot gas inlet passage 1-1 fails, the second pilot gas inlet passage 1-2 can still work normally, ensuring the stable operation of the system.

[0060] The valve plate 1-1 is provided with two intermediate gas passages 1-4 for connecting the gas outlet of the first gas-controlled reversing valve 3-3 with the two gas-controlled ends of the second gas-controlled reversing valve 4-4. The design of the intermediate gas passage 1-4 realizes the connection of the gas path between the first gas-controlled reversing valve 3-3 and the second gas-controlled reversing valve 4-4, enabling the pneumatic motor to achieve more complex gas path control. This improves the flexibility and reliability of the system, enabling the pneumatic motor to adapt to more application scenarios.

[0061] The valve plate 1-1 is provided with two motor gas inlet passages 1-5, which are respectively used to connect the gas outlet of the second gas-controlled reversing valve 4-4 with the piston cavity inlet passage 2-3 on the upper (lower) cylinder head, realizing the axial reciprocating drive of the first piston 2-2. The design of the two motor gas inlet passages 1-5 provides stable gas support for the pneumatic motor, realizing the axial reciprocating drive of the first piston 2-2. This improves the stability and reliability of the system, enabling the pneumatic motor to output larger torque and meet the needs of heavy load applications.

[0062] In this embodiment, the motor gas inlet 6-6 is also connected with the gas inlet of the second gas-controlled reversing valve 4-4, realizing gas path reversing. This enables the gas in the motor gas inlet 6-6 to be reversed by the second gas-controlled reversing valve 4-4, thereby controlling the movement direction and speed of the pneumatic motor. This improves the flexibility and reliability of the system, enabling the pneumatic motor to adapt to more application scenarios.

[0063] A muffler 8-8 is arranged at each of the two exhaust outlets of the first gas-controlled reversing valve 3-3 and the second gas-controlled reversing valve 4-4, reducing exhaust noise. The arrangement of the muffler 8-8 effectively reduces the noise generated by the pneumatic motor during exhaust, improving the quality of the working environment. At the same time, the design of the muffler 8-8 also meets environmental protection requirements, reducing the impact of noise pollution on the surrounding environment.

[0064] As Figure 4As shown, wherein A point is the communication point of the first pilot gas inlet passage 1-1 and the pilot gas channel 2-4, in the embodiment, A point is four, and is divided into two groups, each group has two A points on the same horizontal line, and the two pilot gas channels 2-4 are connected with the air inlet on the upper shell 7-1; B point is the two gas control ends of the first gas control reversing valve 3-3, the five holes between the two B points correspond to the five holes of the first gas control reversing valve 3-3, C point is the two gas control ends of the second gas control reversing valve 4-4, and the five holes between the two C points correspond to the five holes of the first gas control reversing valve 3-3. The design of B point and C point realizes the accurate connection between the first gas control reversing valve 3-3 and the second gas control reversing valve 4-4, and guarantees the accuracy and reliability of the gas path control. The design of five holes improves the flexibility and reliability of the system, so that the pneumatic motor can realize more complex gas path control.

[0065] In the embodiment, the pressure sensor 9 extending to the outside of the valve plate 1 is connected to the first pilot gas inlet passage 1-1, which is used to judge the running frequency of the cylinder by the pressure change of the pilot control valve 7 piston opening at the reversing moment.

[0066] First, the motor running frequency can be detected;

[0067] Second, the motor idle punching can be monitored;

[0068] Third, the motor is combined with the plunger pump, and the plunger pump life monitoring can be realized.

[0069] In the related art, the piston movement is detected by using magnetic or proximity switch, which has poor control accuracy and is easy to be damaged.

[0070] In the embodiment, combined with the gas path diagram in Figure 12 The specific working principle of the embodiment is as follows:

[0071] The pilot gas and the motor inlet gas are two independent gas paths, which are respectively sent to the first gas control reversing valve 3-3 and the second gas control reversing valve 4-4 from the pilot gas inlet 5-5 and the motor inlet 6-6. The pilot gas is divided into three paths after entering the valve plate 1-1, two paths enter the pilot gas channel 1-1 from the first pilot gas inlet passage 1-1, so that the pilot gas and the motor inlet gas can work independently and do not interfere with each other, improving the stability and reliability of the system. The design of dividing the pilot gas into three paths after entering the valve plate 1-1 improves the flexibility and reliability of the system, so that the pneumatic motor can realize more complex gas path control.

[0072] The first piston position control on-off control valve: when the first piston 2-2 is at the highest position, the top on-off control valve 7-7 is opened, the bottom on-off control valve 7-7 is closed, the first reversing valve 3-3 pilot gas passes through the top pilot gas channel 2-4, then is discharged from the motor body lower exhaust port through the opened bottom control valve 7-7, pushes the first pneumatic control reversing valve 3-3 to reverse, then triggers the second reversing valve to reverse, the compressed gas enters the motor cavity from the top air inlet 2-3, is discharged from the bottom air inlet 2-3 through the bottom silencer 8-8, realizes the motor reversing to push the first piston 2-2 to move downward, and the automatic reversing operation of the pneumatic motor is realized through the on-off state of the first piston position control on-off control valve 7-7. When the first piston 2-2 is at the highest position, the top on-off control valve 7-7 is opened, the bottom on-off control valve 7-7 is closed, so that the pilot gas can smoothly enter the pneumatic control end of the first pneumatic control reversing valve 3-3, and the first pneumatic control reversing valve 3-3 is pushed to reverse. At the same time, the compressed gas enters the motor cavity from the top air inlet 2-3, is discharged from the bottom air inlet 2-3 through the bottom silencer 8-8, realizes the motor reversing, and pushes the first piston 2-2 to move downward.

[0073] When the first piston 2-2 moves downward to the lowest position, the bottom on-off control valve 7-7 is opened, the top on-off control valve 7-7 is closed, the first reversing valve 3-3 pilot gas passes through the bottom pilot gas channel 2-4, then is discharged from the motor body lower exhaust port through the opened bottom control valve 7-7, pushes the first pneumatic control reversing valve 3-3 to reverse, then triggers the second reversing valve to reverse, the compressed gas enters the motor cavity from the bottom air inlet 2-3, is discharged from the top air inlet 2-3 through the bottom silencer 8-8, realizes the motor reversing to push the first piston 2-2 to move upward, and the reversing of the pneumatic motor is completed; the automatic reversing operation of the pneumatic motor is realized through the on-off state of the first piston position control on-off control valve 7-7. When the first piston 2-2 moves downward to the lowest position, the bottom on-off control valve 7-7 is opened, the top on-off control valve 7-7 is closed, so that the pilot gas can smoothly enter the pneumatic control end of the first pneumatic control reversing valve 3-3, and the first pneumatic control reversing valve 3-3 is pushed to reverse. At the same time, the compressed gas enters the motor cavity from the bottom air inlet 2-3, is discharged from the top air inlet 2-3 through the bottom silencer 8-8, realizes the motor reversing, and pushes the first piston 2-2 to move upward. The flexibility and reliability of the system are improved, so that the pneumatic motor can realize different movement directions and speeds according to actual needs. One pilot gas can be used to control the first pneumatic control reversing valve 3-3, the second pneumatic control reversing valve 4-4 and the on-off control valve 7-7, without electronic devices, completely using pneumatic control, improving the use convenience and assembly convenience of the product, and having high integration.

[0074] The control of multiple pneumatic control elements is realized by a pilot gas, without the need of a complex electronic control system, improving the use convenience and assembly convenience of the product.

[0075] The above description is an explanation of the present application, not a limitation of the application, the scope of the present application is defined in the claims, within the protection scope of the present application, any form of modification can be made.

Claims

1. A control valve for on / off switching, characterized in that, include: The upper shell has two vents perpendicular to the same horizontal plane on its side wall, and the vents are located in the middle of the upper shell in the axial direction; The lower housing is connected to the upper housing. A pinhole is provided at the end of the lower housing away from the upper housing. At least one vent is provided on the side wall of the lower housing, and the vent is located at the lower end of the side wall of the lower housing. The ejector pin is located inside the lower housing, with one end of the ejector pin passing through the pin hole and extending outward; The second piston is disposed inside the upper housing and moves axially along the upper housing; the second piston is in contact with the ejector pin. The upper spring is located inside the upper housing, between the second piston and the inner top wall of the upper housing; The lower spring is located inside the lower housing, between the horizontal section of the ejector pin and the second piston.

2. The conduction control valve according to claim 1, characterized in that, Both the upper and lower shells are variable-diameter columnar structures.

3. The on-state control valve according to claim 1, characterized in that, The ejector pin is cross-shaped, with its horizontal section located inside the lower housing. The second piston has a guide groove corresponding to the ejector pin on the side near the ejector pin.

4. The on-state control valve according to claim 1, characterized in that, The upper housing and the lower housing are connected by threads or interference fit.

5. A pneumatic motor, characterized in that, It includes a conduction control valve as described in any one of claims 1-4, and further includes: The pneumatic motor body includes a cylinder and cylinder heads connected to both ends of the cylinder along its axial direction. A piston chamber is provided inside the cylinder. Both the upper and lower cylinder heads have accommodating cavities for accommodating a control valve. An exhaust channel is also provided near the exhaust port in the accommodating cavity, and the exhaust channel extends out of the pneumatic motor body. The pneumatic control valve mechanism includes a valve plate fixedly connected to the pneumatic motor body. A pilot gas inlet and a motor inlet are respectively provided on both sides of the valve plate for supplying pilot gas and motor driving gas, respectively. Two pilot gas channels extending towards the valve plate are provided on the radial sidewall of the accommodating cavity, and the two pilot gas channels are located on the same horizontal plane and correspond to the position of the air port of the control valve. The valve plate is equipped with a gas passage system for introducing pilot gas and motor driving gas into the corresponding positions to realize the reversing drive of the pneumatic motor.

6. The pneumatic motor according to claim 5, characterized in that, The pneumatic motor body also includes a first piston that is disposed in the piston chamber and reciprocates along the cylinder axis. A piston rod that moves along the cylinder axis is connected to the first piston. A piston hole corresponding to the piston rod is opened on the cylinder. The conduction control valve is installed in the accommodating cavity and is parallel to the cylinder axis.

7. The pneumatic motor according to claim 5, characterized in that, The pneumatic control valve mechanism also includes a first pneumatic control directional valve and a second pneumatic control directional valve mounted on the valve plate. The first pneumatic control directional valve is a two-position five-way valve, and the second pneumatic control directional valve is a three-position five-way pneumatic control valve. Both the first and second pneumatic control directional valves are provided with two pneumatic control terminals.

8. The pneumatic motor according to claim 7, characterized in that, The gas passage system includes two first pilot gas inlet passages and two first pilot gas outlet passages leading out from the pilot gas inlet. The gas passage system also includes a second pilot gas inlet passage, two intermediate gas passages, and two motor gas inlet passages leading out from the pilot gas inlet.

9. The pneumatic motor according to claim 8, characterized in that, The first pilot gas intake passage is used to introduce pilot gas and connect it to the pilot gas passage on the upper (lower) cylinder head, and simultaneously connect it to the first pilot gas outlet passage. The first pilot gas outlet passage is connected to the pneumatic control end of the first pneumatic control valve to realize the reversing flow of pilot gas. The second pilot gas intake passage is connected to the inlet of the first pneumatic control valve. The intermediate gas passage is used to connect the outlet of the first pneumatic control valve to the two pneumatic control ends of the second pneumatic control valve. The two motor gas intake passages are respectively used to connect the outlet of the second pneumatic control valve to the piston chamber intake passage on the upper (lower) cylinder head. The motor gas inlet is also connected to the inlet of the second pneumatic control valve to realize the reversing of the gas path.

10. The pneumatic motor according to claim 5, characterized in that, Both the first and second pneumatic directional valves are equipped with silencers at their respective exhaust ports to reduce exhaust noise.

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