Automatic reversing pneumatic motor

Abstract

The automatic reversing pneumatic motor comprises an air cylinder assembly and a reversing system, the air cylinder assembly comprises a cylinder body, a piston and two end covers, and the piston is arranged in a piston cavity in a reciprocating sliding mode; the reversing system comprises an air distribution block, an air control valve and a pilot valve, the air distribution block is provided with an air inlet channel, an air return channel, a main air channel and an exhaust channel, and the main air channel is communicated with the cavity; the pilot valve comprises a valve body and a valve rod, an air inlet ring groove, an exhaust ring groove and a control ring groove are sequentially formed in the peripheral surface of the valve body, the air inlet ring groove is communicated with the air inlet channel, the air return channel is communicated with the pilot cavity of the pneumatic control valve through the control ring groove, the exhaust ring groove is communicated with the exhaust channel, and the part, penetrating out of the valve body, of the valve rod extends into the cavity; and the valve rod can be driven to keep an alternative communication state between the air inlet ring groove and the exhaust ring groove. Automatic reversing of the pneumatic motor can be achieved, a traditional reversing mode depending on electrical components is replaced, and the pneumatic motor has the advantages of being sensitive in reversing action, high in reliability, low in failure rate and long in service life.

Description

Technical Field

[0001] The invention relates to the technical field of reversing control of pneumatic motors, in particular to an automatic reversing pneumatic motor. Background Art

[0002] Air motors, also known as pneumatic motors, are devices that convert the pressure energy of compressed air into rotational mechanical energy. They are generally used as a rotational power source for more complex devices or machines. Pneumatic motors are classified by structure into: vane pneumatic motors, piston pneumatic motors, compact vane pneumatic motors, and compact piston pneumatic motors.

[0003] When the current pneumatic motor is working, it usually uses a magnetic induction switch to detect that the piston is in the limit position, and then transmits the detected electrical signal to the solenoid valve to switch the two ends of the pneumatic motor for intake and exhaust (that is, the original intake port is switched to the exhaust port, and the original exhaust port is switched to the intake port), so as to realize the automatic reversal of the pneumatic motor. However, the above method relies on electrical components for reversing, which is easily affected by the external magnetic field environment, resulting in large control errors, poor accuracy, high failure rate, and high maintenance costs. Summary of the invention

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides an automatic reversing pneumatic motor.

[0005] The present application provides an automatic reversing pneumatic motor, comprising:

[0006] A cylinder assembly, comprising a cylinder body, a piston and two end covers, wherein the two end covers are respectively arranged at two ends of the cylinder body in the first direction, so that a closed piston cavity is formed inside the cylinder body, and the piston is reciprocatingly slidably arranged in the piston cavity, and the piston cavity is divided into two independent chambers;

[0007] A reversing system, comprising a gas distribution block, an air control valve connected to the gas distribution block, and a pilot valve arranged on a corresponding end cover, wherein the gas distribution block is arranged on the outer peripheral side of the cylinder body, and the gas distribution block is provided with an air inlet duct, an air return duct, a main air duct and an exhaust duct, and the main air duct is connected to the chamber;

[0008] The pilot valve comprises a valve body and a valve stem slidably arranged on the valve body, the outer peripheral surface of the valve body is provided with an intake ring groove, an exhaust ring groove and a control ring groove in sequence along a first direction, the intake ring groove is connected with the intake passage, the return passage is connected with the pilot chamber of the air control valve through the control ring groove, the exhaust ring groove is connected with the exhaust passage, and the valve stem part passing through the valve body extends into the chamber;

[0009] The valve stem can be driven to maintain a selective connection state between the intake ring groove and the exhaust ring groove.

[0010] In one embodiment, the portion of the valve stem located within the valve body is provided with a first abutment portion and a second abutment portion along its circumference, the first abutment portion is used to seal the intake ring groove, the second abutment portion is used to seal the exhaust ring groove, and an annular flow channel is defined between the first abutment portion and the second abutment portion for connecting the control ring groove with the intake ring groove or the exhaust ring groove.

[0011] In one embodiment, the pilot valve further includes a valve cover, which is connected to one end of the valve body close to the end cover and located above the end cover, the valve cover abuts against the end surface of the end cover, and a reset elastic member is provided between the bottom cover and the valve stem.

[0012] In one embodiment, the valve cover has an installation hole on its end surface facing the valve body, the valve stem has a limiting hole on one end close to the valve cover, one end of the reset elastic member is fixed in the installation hole, and the other end is fixed in the limiting hole.

[0013] In one embodiment, the valve cover has a first sealing groove circumferentially disposed at one end connected to the valve body, a first sealing ring is fixed in the first sealing groove, and a portion of the first sealing ring protruding from the first sealing groove abuts against an end face of the valve body.

[0014] In one embodiment, a plurality of second sealing grooves distributed along a first direction are circumferentially provided on the outer peripheral side of the valve body, a second sealing ring is fixed in the second sealing groove, and a portion of the second sealing ring protruding from the second sealing groove contacts the end cover; and / or,

[0015] The inner side surface of the valve body is circumferentially provided with a plurality of third sealing grooves distributed along the first direction, a third sealing ring is fixed in the third sealing groove, and a portion of the third sealing ring protruding from the third sealing groove contacts the first abutting portion or the second abutting portion.

[0016] In one embodiment, the end cover is provided with a first flow channel and a second flow channel that are connected, the first flow channel passes through the end cover along a first direction and is connected to the chamber, the second flow channel extends along a second direction and passes through the side of the end cover for connecting to the gas distribution block, and the second flow channel is connected to the main air channel; wherein the second direction intersects with the first direction.

[0017] In one embodiment, a third flow channel is provided on the air distribution block, and the third flow channel is connected to the air inlet channel. A vent hole is opened on the surface of the air distribution block used to connect with the air control valve, and the vent hole is used to connect the air inlet of the air control valve with the third flow channel.

[0018] In one embodiment, a muffler is connected to the gas outlet of the exhaust duct, and the muffler is used to mute the gas discharged into the atmosphere.

[0019] In one embodiment, the automatic reversing pneumatic motor further includes a piston rod, which is disposed in the piston cavity along a first direction, and one end of the piston rod passes through one of the two end covers, and the piston is sleeved on the piston rod.

[0020] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0021] By arranging corresponding pilot valves on the two end covers, and extending the part of the valve stem in the pilot valve that extends out of the valve body into the chamber, so that the piston slides in the piston chamber and abuts the valve stem, and drives the valve stem to slide in the valve body, thereby maintaining a selective connection state between the intake ring groove and the exhaust ring groove. If the valve stem of a pilot valve is abutted and driven by the piston, the intake ring groove and the control ring groove are in a connected state. At this time, the air source introduced into the gas distribution block enters the intake ring groove through the intake duct, and flows out from the control ring groove to the return duct, and then enters the pilot chamber of the air control valve through the return duct, thereby driving the valve shaft of the air control valve to move, so as to switch the air source to enter the chamber under compression through the main air duct, while the other pilot valve When the valve stem is not driven by the piston, the exhaust ring groove and the control ring groove are in a connected state, and the air source in the gas distribution block cannot enter the pilot valve. Only the air source in the air control valve enters the pilot valve from the control ring groove and flows out from the exhaust ring groove to the air control valve, so that the pilot chamber of the air control valve is connected with the exhaust duct, and then the air source of the chamber in the expanded state enters the gas distribution block through the main air duct and is discharged to the atmosphere from the exhaust duct. The piston can be pushed to move by the pressure, thereby realizing automatic reversing of the pneumatic motor, replacing the traditional method of reversing by electrical components, without being subject to the influence of the external magnetic field environment, and having the advantages of sensitive reversing action, high reliability, low failure rate and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0024] In the attached figure:

[0025] Figure 1 It is a structural schematic diagram of an automatic reversing pneumatic motor of the present application;

[0026] Figure 2 It is a top view schematic diagram of an automatic reversing pneumatic motor of the present application;

[0027] Figure 3 yes Figure 2 Schematic cross-sectional view of AA in the figure;

[0028] Figure 4 It is a cross-sectional schematic diagram of a pilot valve in an automatic reversing pneumatic motor of the present application in a triggered state;

[0029] Figure 5 It is a cross-sectional schematic diagram of a pilot valve in an automatic reversing pneumatic motor of the present application in an untriggered state;

[0030] Figure 6 It is a top view schematic diagram of a gas distribution block in an automatic reversing pneumatic motor of the present application;

[0031] Figure 7 yes Figure 6 A schematic cross-sectional view of the middle BB;

[0032] Figure 8 It is a schematic diagram of an end cover of an automatic reversing automatic motor of the present application.

[0033] Figure Number:

[0034] 10. Cylinder assembly; 11. Cylinder body; 11a. Piston chamber; 12. End cover; 12a. First flow channel; 12b. Second flow channel; 13. Piston; 20. Reversing system; 21. Gas distribution block; 21a. Intake channel; 21b. Return channel; 21c. Main air channel; 21d. Exhaust channel; 21e. Third flow channel; 22. Air control valve; 23. Pilot valve; 231. Valve body; 231a. Intake ring groove; 231b. Control ring groove; 231 c, exhaust ring groove; 231d, second sealing groove; 231e, third sealing groove; 232, valve stem; 232a, limiting hole; 232b, first abutment portion; 232c, second abutment portion; 233, valve cover; 233a, mounting hole; 233b, first sealing chamber; 24, muffler; 30, piston rod; 40, first sealing ring; 50, second sealing ring; 60, third sealing ring; 70, annular flow channel; 80, pull rod bolt;. DETAILED DESCRIPTION

[0035] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0036] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0037] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0038] Please refer to Figures 1 to 8 The present application provides an automatic reversing pneumatic motor, which includes a cylinder assembly 10 and a reversing system 20. The cylinder assembly 10 includes a cylinder body 11, a piston 13 and two end covers 12. The two end covers 12 are respectively arranged at the two ends of the cylinder body 11 in the first direction, so that the interior of the cylinder body 11 forms a closed piston chamber 11a. The piston 13 can be reciprocatingly slidably arranged in the piston chamber 11a, and the piston chamber 11a is divided into two independent chambers. The reversing system 20 includes a gas distribution block 21, an air control valve 22 connected to the gas distribution block 21, and a pilot valve 23 arranged on the corresponding end cover 12. The gas distribution block 21 is arranged on the outer peripheral side of the cylinder body 11, and the gas distribution block 21 is provided with an inlet duct 21a, a return duct 21b, a main air duct 21c and an exhaust duct 21d, and the main air duct 21c is connected to the chamber. The pilot valve 23 includes a valve body 231 and a valve stem 232 slidably arranged on the valve body 231. The outer peripheral surface of the valve body 231 is provided with an intake ring groove 231a, an exhaust ring groove 231c and a control ring groove 231b in sequence along a first direction. The intake ring groove 231a is connected with the intake duct 21a, the return duct 21b is connected with the pilot chamber of the air control valve 22 through the control ring groove 231b, the exhaust ring groove 231c is connected with the exhaust duct 21d, and the part of the valve stem 232 that passes through the outside of the valve body 231 extends into the chamber.

[0039] The valve stem 232 can be driven to maintain a selective communication state between the intake ring groove 231a and the exhaust ring groove 231c.

[0040] The automatic reversing pneumatic motor of this embodiment is provided with corresponding pilot valves 23 on the two end covers 12, and the valve stem 232 of the pilot valve 23 is extended into the chamber so that the piston 13 slides in the piston chamber 11a and abuts against the valve stem 232, and drives the valve stem 232 to slide in the valve body 231, thereby maintaining a selective connection state between the intake annular groove 231a and the exhaust annular groove 231c. If a pilot valve When the valve stem 232 of the air control valve 23 is abutted and driven by the piston 13, the intake annular groove 231a and the control annular groove 231b are in a connected state. At this time, the air source introduced into the air distribution block 21 enters the intake annular groove 231a through the intake duct 21a, and flows out from the control annular groove 231b to the return duct 21b, and then enters the pilot cavity of the air control valve 22 through the return duct 21b, thereby driving the valve shaft of the air control valve 22 to move, so as to switch the air source through the main air duct 21a. 1c enters into the chamber in compression, and the valve stem 232 of the other pilot valve 23 is not driven by the piston 13, then the exhaust ring groove 231c and the control ring groove 231b are in a connected state, and the air source in the air distribution block 21 cannot be passed into the pilot valve 23, and only the air source in the air control valve 22 enters into the pilot valve 23 from the control ring groove 231b, and flows out from the exhaust ring groove 231c to the air control valve 22, so that the pilot chamber of the air control valve 22 is connected with the exhaust channel 21d, and then the air source of the chamber in the expansion state enters into the air distribution block 21 through the main air channel 21c, and is discharged to the atmosphere from the exhaust channel 21d, so that the piston 13 can be pushed to move by the pressure effect, thereby realizing the automatic reversing of the pneumatic motor, replacing the traditional reversing method relying on electrical components, without being subject to the influence of the external magnetic field environment, and having the advantages of sensitive reversing action, high reliability, low failure rate and long service life.

[0041] In order to facilitate the inspection and maintenance of the piston 13, the two end covers 12 are connected to the cylinder body 11 in a detachable manner, which may include but is not limited to a clamping connection, a bolt connection, etc. In practical applications, by providing fixing holes in the portions of the two end covers 12 extending to the periphery of the cylinder body 11, and using the two ends of the tie rod bolt 80 to be connected to the fixing holes of the two end covers 12 respectively, the two end covers 12 are detachably connected to the two ends of the cylinder body 11.

[0042] Here, it should be noted that the first direction mentioned above is fictitious for the convenience of describing the positional relationship between components. Figure 1 The X direction in .

[0043] In addition, the air control valve 22 of this embodiment adopts a two-position five-way valve, and the specific structure and connection method can adopt the existing technology, which will not be described in detail.

[0044] In one embodiment, the portion of the valve stem 232 located in the valve body 231 is provided with a first abutting portion 232b and a second abutting portion 232c along its circumference, the first abutting portion 232b is used to block the intake annular groove 231a, the second abutting portion 232c is used to block the exhaust annular groove 231c, and an annular flow channel 70 is defined between the first abutting portion 232b and the second abutting portion 232c, which is used to connect the control annular groove 231b with the intake annular groove 231a or the exhaust annular groove 231c. In other words, by driving the valve stem 232 to slide, the first abutting portion 232b and the second abutting portion 232c can be used to alternately block the intake annular groove 231a and the exhaust annular groove 231c, respectively, so that the gas path state can be dynamically adjusted according to the position of the valve stem 232, thereby achieving precise control and efficient switching of the gas path.

[0045] In one embodiment, the pilot valve 23 further includes a valve cover 233, which is connected to one end of the valve body 231 close to the end cover 12 and is located above the end cover 12. The valve cover 233 abuts against the end face of the end cover 12, and a reset elastic member is provided between the bottom cover and the valve stem 232. In this way, by providing the valve cover 233 at one end of the valve body 231 close to the end cover 12 and making the valve cover 233 contact the end face of the end cover 12 to form a rigid connection, the stability of the overall structure of the pilot valve 23 can be ensured, and the surface contact can be cleverly used to prevent gas leakage. In addition, the provision of the reset elastic member can provide a stable reset force for the valve stem 232, ensuring that the valve stem 232 can quickly and accurately return to the initial position after being triggered, and ensuring the timeliness and consistency of the circumferential direction of the pneumatic motor.

[0046] In one embodiment, the end surface of the valve cover 233 facing the valve body 231 is provided with a mounting hole 233a, and the end of the valve stem 232 close to the valve cover 233 is provided with a limiting hole 232a, and one end of the reset elastic member is fixed in the mounting hole 233a, and the other end is fixed in the limiting hole 232a. In this way, the two ends of the reset elastic member can be respectively extended into the mounting hole 233a and the limiting hole 232a for fixation, which can reduce the stress concentration of the reset elastic member in the long-term reciprocating motion, effectively extend the service life, and at the same time ensure the stable fixation and efficient reset function of the reset elastic member.

[0047] In addition, the above-mentioned reset elastic member can be a compression spring in the prior art, or an elastic member that can reset the valve stem 232, and there is no limitation on this.

[0048] In one embodiment, the end of the valve cover 233 connected to the valve body 231 is provided with a first sealing groove along the circumferential direction, a first sealing ring 40 is fixed in the first sealing groove, and the portion of the first sealing ring 40 protruding from the first sealing groove abuts against the end face of the valve body 231. In practical applications, after the valve cover 233 and the valve body 231 are assembled, the portion of the first sealing ring 40 protruding from the first sealing groove abuts against the end face of the valve body 231 to form a tight sealing effect, which can effectively block gas leakage from the connection between the valve cover 233 and the valve body 231, and ensure the pressure stability of the gas path system.

[0049] In one embodiment, the outer circumferential side of the valve body 231 is provided with a plurality of second sealing grooves 231d distributed along the first direction along the circumferential direction, a second sealing ring 50 is fixed in the second sealing groove 231d, and the portion of the second sealing ring 50 protruding from the second sealing groove 231d contacts the end cover 12. And / or, the inner side surface of the valve body 231 is provided with a plurality of third sealing grooves 231e distributed along the first direction along the circumferential direction, a third sealing ring 60 is fixed in the third sealing groove 231e, and the portion of the third sealing ring 60 protruding from the third sealing groove 231e contacts the first abutting portion 232b or the second abutting portion 232c.

[0050] It should be noted that the above-mentioned term "and / or" is only a description of the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the front and rear associated objects are in an "or" relationship. The second sealing ring 50 on the outer periphery of the valve body 231 contacts the end cover 12 to form a radial seal to prevent the gas source from leaking from the assembly gap between the valve body 231 and the end cover 12. At the same time, the third sealing ring 60 on the inner side of the valve body 231 contacts the first abutment portion 232b or the second abutment portion 232c to form an axial seal to prevent the gas source from being mixed with the intake ring groove 231a and the exhaust ring groove 231c during the movement of the valve stem 232. That is to say, in this embodiment, the second sealing ring 50 and the third sealing ring 60 are provided at the same time to realize efficient sealing of the air circuit of the pneumatic motor, which has both static sealing reliability and dynamic adaptability, and can effectively solve the problems of low energy efficiency and high failure rate caused by poor sealing of existing pneumatic motors.

[0051] The second direction intersects with the first direction, and the second direction is set to facilitate the description of the positional relationship between the components. Figure 1 in the Y direction.

[0052] In addition, the first sealing ring 40, the second sealing ring 50 and the third sealing ring 60 of the above embodiment can be made of elastic material (such as nitrile rubber, fluororubber, etc.) so that they can compensate for the gap fluctuation caused by mechanical vibration or temperature change, thereby maintaining a long-term sealing effect.

[0053] In practical applications, the main air channel 21c on the gas distribution block 21 is used to introduce the gas source into the chamber or to discharge the gas source in the chamber. For this purpose, it is necessary to ensure that the main air channel 21c is connected to the chamber so that the gas source can enter or be discharged normally. Therefore, in one embodiment, the end cover 12 is provided with a first flow channel 12a and a second flow channel 12b that are connected. The first flow channel 12a passes through the end cover 12 along a first direction and is connected to the chamber. The second flow channel 12b extends along a second direction and passes through the side of the end cover 12 for connecting with the gas distribution block 21, and the second flow channel 12b is connected to the main air channel 21c. That is to say, when it is necessary to introduce air source into the chamber to drive the piston 13 to move, the air source introduced into the gas distribution block 21 flows into the second flow channel 12b through the main air channel 21c, and flows from the second flow channel 12b to the first flow channel 12a, and finally enters the chamber, thereby completing the introduction of air source into the chamber; when it is necessary to exhaust the air source in the chamber, the air source in the chamber flows from the first flow channel 12a to the second flow channel 12b, and flows from the second flow channel 12b to the main air channel 21c and enters the gas distribution valve, and finally is discharged into the atmosphere through the exhaust channel 21d. In addition, the gas distribution block 21 can be fixed by bolts, that is, the upper end and the lower end of the gas distribution block 21 are respectively in contact with the two end covers 12. At this time, the outlet of the main air channel 21c on the gas distribution block 21 is connected to the second flow channel 12b. Then, bolts are used to penetrate the gas distribution block 21 and extend into the bolt holes of the end covers 12, so that the gas distribution block 21 can be detachably connected to the outside of the cylinder body 11. The structure is simple and easy to disassemble and assemble.

[0054] In one embodiment, a third flow channel 21e is provided on the gas distribution block 21, and the third flow channel 21e is connected to the air inlet 21a. A vent hole is provided on the surface of the gas distribution block 21 for connecting with the air control valve 22, and the vent hole is used to connect the air inlet of the air control valve 22 with the third flow channel 21e. In other words, by providing the third flow channel 21e on the gas distribution block 21, an external gas source can flow in from the third flow channel 21e, and the gas source is divided into two paths through the air inlet 21a and the vent hole, one path of the gas source is passed from the air inlet 21a into the pilot valve 23, and the other path is passed from the air inlet of the air control valve 22 into the air control valve 22, and then the valve shaft of the air control valve 22 can be driven to move by the introduced gas source, so as to realize the switching of the control gas source into the corresponding chamber.

[0055] In one embodiment, a muffler 24 is connected to the gas outlet of the exhaust duct 21d, and the muffler 24 is used to muffle the gas discharged to the atmosphere. In practical applications, when the gas source is discharged through the exhaust duct 21d, it is usually accompanied by a large noise. In this regard, in this embodiment, by connecting the muffler 24 to the gas outlet of the exhaust duct 21d, the muffler 24 is used to suppress the airflow vibration and turbulent noise of the gas when it is discharged at high speed, which can significantly reduce the exhaust noise.

[0056] In one embodiment, the automatic reversing pneumatic motor further includes a piston rod 80, which is arranged in the piston cavity 11a along a first direction, and one end of the piston rod 80 passes through one of the two end covers 12, and the piston 13 is sleeved on the piston rod 80. In other words, by arranging the piston rod 80 along a predetermined direction (i.e., the first direction), a rigid guide can be provided for the movement of the piston 13, thereby preventing the piston 13 from lateral deviation or jamming during the sliding process in the cylinder body 11, ensuring the accuracy and consistency of the motion trajectory, and helping to improve the operating stability of the pneumatic motor. In addition, in actual applications, the piston 13 is fixed to the piston rod 80 by a threaded connection, so that when the piston 13 is pushed to move, the piston rod 80 slides relative to the end cover 12, thereby ensuring that the piston 13 and the piston rod 80 move as a whole.

[0057] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, the above technical features can be freely combined without departing from the concept of the present invention, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the coverage of the claims of the present invention.

Claims

1. An automatic reversing pneumatic motor, characterized in that: include: A cylinder assembly, comprising a cylinder body, a piston and two end covers, wherein the two end covers are respectively arranged at two ends of the cylinder body in the first direction, so that a closed piston cavity is formed inside the cylinder body, and the piston is reciprocatingly slidably arranged in the piston cavity, and the piston cavity is divided into two independent chambers; A reversing system, comprising a gas distribution block, an air control valve connected to the gas distribution block, and a pilot valve arranged on a corresponding end cover, wherein the gas distribution block is arranged on the outer peripheral side of the cylinder body, and the gas distribution block is provided with an air inlet duct, an air return duct, a main air duct and an exhaust duct, and the main air duct is connected to the chamber; The pilot valve comprises a valve body and a valve stem slidably arranged on the valve body, the outer peripheral surface of the valve body is provided with an intake ring groove, an exhaust ring groove and a control ring groove in sequence along a first direction, the intake ring groove is connected with the intake passage, the return passage is connected with the pilot chamber of the air control valve through the control ring groove, the exhaust ring groove is connected with the exhaust passage, and the valve stem part passing through the valve body extends into the chamber; The valve stem can be driven to maintain a selective connection state between the intake ring groove and the exhaust ring groove.

2. The automatic reversing pneumatic motor according to claim 1, characterized in that: The portion of the valve stem located within the valve body is provided with a first abutment portion and a second abutment portion along its circumference, the first abutment portion being used to seal the intake ring groove, the second abutment portion being used to seal the exhaust ring groove, and an annular flow channel being defined between the first abutment portion and the second abutment portion for connecting the control ring groove with the intake ring groove or the exhaust ring groove.

3. The automatic reversing pneumatic motor according to claim 1 or 2, characterized in that: The pilot valve further comprises a valve cover, which is connected to one end of the valve body close to the end cover and is located above the end cover. The valve cover abuts against the end surface of the end cover, and a reset elastic member is provided between the bottom cover and the valve stem.

4. The automatic reversing pneumatic motor according to claim 3, characterized in that: The valve cover is provided with a mounting hole on the end surface facing the valve body, the valve stem is provided with a limiting hole at one end close to the valve cover, one end of the reset elastic member is fixed in the mounting hole, and the other end is fixed in the limiting hole.

5. The automatic reversing pneumatic motor according to claim 2, characterized in that: The valve cover has one end connected to the valve body and is provided with a first sealing groove along the circumferential direction. A first sealing ring is fixed in the first sealing groove. The portion of the first sealing ring protruding from the first sealing groove abuts against the end surface of the valve body.

6. The automatic reversing pneumatic motor according to claim 5, characterized in that: The outer peripheral side of the valve body is provided with a plurality of second sealing grooves distributed along the first direction along the circumferential direction, a second sealing ring is fixed in the second sealing groove, and a portion of the second sealing ring protruding from the second sealing groove contacts the end cover; and / or, The inner side surface of the valve body is circumferentially provided with a plurality of third sealing grooves distributed along the first direction, a third sealing ring is fixed in the third sealing groove, and a portion of the third sealing ring protruding from the third sealing groove contacts the first abutting portion or the second abutting portion.

7. The automatic reversing pneumatic motor according to claim 1, characterized in that: The end cover is provided with a first flow channel and a second flow channel that are connected. The first flow channel penetrates the end cover along a first direction and is connected to the chamber. The second flow channel extends along a second direction and penetrates the side of the end cover for connecting to the gas distribution block, and the second flow channel is connected to the main air channel; wherein the second direction intersects with the first direction.

8. The automatic reversing pneumatic motor according to claim 1, characterized in that: The air distribution block is provided with a third flow channel, the third flow channel is connected to the air inlet channel, and the surface of the air distribution block used to be connected to the air control valve is provided with an air vent, and the air vent is used to connect the air inlet of the air control valve with the third flow channel.

9. The automatic reversing pneumatic motor according to claim 1, characterized in that: A muffler is connected to the gas outlet of the exhaust duct, and the muffler is used to mute the gas discharged into the atmosphere.

10. The automatic reversing pneumatic motor according to claim 1, characterized in that: The automatic reversing pneumatic motor further comprises a piston rod, which is arranged in the piston cavity along a first direction, and one end of the piston rod passes through one of the two end covers, and the piston is sleeved on the piston rod.

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