Self-reversing pneumatic motor

Abstract

The application discloses an automatic reversing pneumatic motor, which comprises a cylinder assembly and a reversing system. The cylinder assembly comprises a cylinder body, a piston and two end covers, and the piston is arranged in the piston cavity in a reciprocating sliding mode. The reversing system comprises a valve distribution block, a gas control valve and a pilot valve. The valve distribution block is provided with an air inlet channel, an air return channel, a main air channel and an air outlet channel, and the main air channel is connected with the cavity. The pilot valve comprises a valve body and a valve rod. The outer circumferential surface of the valve body is sequentially provided with an air inlet ring groove, an air outlet ring groove and a control ring groove. The air inlet ring groove is connected with the air inlet channel, the air return channel is connected with the pilot cavity of the gas control valve through the control ring groove, the air outlet ring groove is connected with the air outlet channel, and the part of the valve rod penetrating out of the valve body extends into the cavity. The valve rod can be driven to keep the selective connection state between the air inlet ring groove and the air outlet ring groove. The automatic reversing of the pneumatic motor is realized, the traditional reversing mode relying on electrical components is replaced, and the pneumatic motor has the advantages of sensitive reversing action, high reliability, low failure rate and long service life.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of commutation control of pneumatic motor, and particularly to an automatic commutation pneumatic motor. BACKGROUND

[0002] The pneumatic motor is also called air motor, which is a device for converting the pressure energy of compressed air into rotary mechanical energy. It is generally used as a rotary power source of more complex devices or machines. The pneumatic motor is classified by structure into a vane type pneumatic motor, a piston type pneumatic motor, a compact vane type pneumatic motor and a compact piston type pneumatic motor.

[0003] At present, the pneumatic motor usually adopts a magnetic induction switch to detect the limit position of the piston during work, and then transmits the detected electric signal to an electromagnetic valve to switch the inlet and outlet of the pneumatic motor (i.e. the original inlet is switched to the outlet, and the original outlet is switched to the inlet), so as to realize the automatic commutation of the pneumatic motor. However, the above-mentioned method relies on electrical components for commutation, which is easily affected by external magnetic field environment, resulting in large control error, poor precision, high failure rate and high maintenance cost. SUMMARY

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

[0005] The present application provides an automatic commutation pneumatic motor, which comprises:

[0006] A cylinder assembly comprising a cylinder body, a piston and two end covers, the two end covers are arranged at both ends of the cylinder body in the first direction to form a closed piston cavity inside the cylinder body, the piston is arranged in the piston cavity and divides the piston cavity into two independent chambers;

[0007] A commutation system comprising a valve distribution block, a gas control valve connected to the valve distribution block and a pilot valve arranged on the corresponding end cover, the valve distribution block is arranged on the outer periphery of the cylinder body, and the valve distribution block is provided with an inlet channel, a return channel, a main channel and an exhaust channel, the main channel is in communication with the chamber;

[0008] The pilot valve comprises a valve body and a valve rod slidably arranged on the valve body, the outer periphery of the valve body is sequentially provided with an inlet ring groove, an exhaust ring groove and a control ring groove in the first direction, the inlet ring groove is in communication with the inlet channel, the return channel is in communication with the pilot cavity of the gas control valve through the control ring groove, the exhaust ring groove is in communication with the exhaust channel, and the part of the valve rod protruding out of the valve body extends into the chamber;

[0009] The valve rod is arranged to drive the air inlet ring groove and the air outlet ring groove to be in selective communication.

[0010] In one embodiment, the valve rod is provided with a first abutting portion and a second abutting portion along the circumference of the portion of the valve rod located in the valve body, the first abutting portion is used to block the air inlet ring groove, the second abutting portion is used to block the air outlet ring groove, and an annular flow channel is defined between the first abutting portion and the second abutting portion, which is used to communicate the control ring groove with the air inlet ring groove or the air outlet ring groove.

[0011] In one embodiment, the pilot valve further comprises a valve cover connected to one end of the valve body close to the end cover and located above the end cover, the valve cover abuts the end face of the end cover, and a reset elastic member is arranged between the valve cover and the valve rod.

[0012] In one embodiment, the valve cover is provided with a mounting hole towards the end face of the valve body, the valve rod 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.

[0013] In one embodiment, the valve cover is provided with a first sealing groove along the circumference of the end of the valve cover connected to the valve body, a first sealing ring is fixed in the first sealing groove, and the part of the first sealing ring protruding from the first sealing groove abuts the end face of the valve body.

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

[0015] The inner side face of the valve body is provided with a plurality of third sealing grooves distributed along the first direction along the circumference, a third sealing ring is fixed in the third sealing groove, and the part 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 in communication, the first flow channel penetrates the end cover along the first direction and communicates with the chamber, the second flow channel extends along the second direction and penetrates the side face of the end cover connected to the valve block, and the second flow channel communicates with the main gas channel; wherein the second direction intersects the first direction.

[0017] In an embodiment, the gas distribution block is provided with a third flow channel, the third flow channel is in communication with the gas inlet channel, and the surface of the gas distribution block connected with the gas control valve is provided with a gas passage hole, the gas passage hole is used for connecting the gas inlet of the gas control valve with the third flow channel.

[0018] In an embodiment, the exhaust outlet of the exhaust channel is connected with a silencer, and the silencer is used for silencing the gas discharged to the atmosphere.

[0019] In an embodiment, the automatic reversing pneumatic motor further comprises a piston rod, the piston rod is arranged in the piston cavity in the first direction, one end of the piston rod penetrates one of the two end covers, and the piston sleeve is sleeved on the piston rod.

[0020] Compared with the prior art, the above technical solution provided by the embodiments of the present application has the following advantages:

[0021] By arranging corresponding pilot valves on the two end covers and extending the part of the valve rod of the pilot valve outside the valve body into the chamber, the piston is caused to slide in the piston cavity and abut against the valve rod, and the valve rod is caused to slide in the valve body, thereby maintaining the selective communication state between the intake ring groove and the exhaust ring groove. If the valve rod of one pilot valve is abutted and driven by the piston, the intake ring groove and the control ring groove are in communication. At this time, the gas source introduced into the gas distribution block enters the intake ring groove through the gas inlet channel and flows out of the control ring groove to the gas return channel, and then enters the pilot chamber of the gas control valve through the gas return channel, thereby driving the valve shaft of the gas control valve to move to switch the gas source to enter the chamber in the compression state through the main gas channel. The valve rod of the other pilot valve is not driven by the piston, so the exhaust ring groove and the control ring groove are in communication. The gas source in the gas distribution block cannot enter the pilot valve, and only the gas source in the gas control valve enters the pilot valve from the control ring groove and flows out of the exhaust ring groove to the gas control valve, so that the pilot chamber of the gas control valve is in communication with the exhaust channel, thereby allowing the gas source of the chamber in the expansion state to enter the gas distribution block through the main gas channel and then be discharged to the atmosphere through the exhaust channel. The piston can be moved by using the pressure effect, thereby realizing the automatic reversing of the pneumatic motor, replacing the traditional reversing mode relying on electrical components, and avoiding the influence of the external magnetic field environment. The reversing action is sensitive, reliable, has a low failure rate, and has a long service life. BRIEF DESCRIPTION OF DRAWINGS

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

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

[0024] In the drawings:

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

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

[0027] Figure 3 is Figure 2 a sectional view schematic diagram of A-A in FIG.

[0028] Figure 4 is a sectional view schematic diagram of an automatic reversing pneumatic motor according to the present application when a pilot valve is in a triggered state;

[0029] Figure 5 is a sectional view schematic diagram of an automatic reversing pneumatic motor according to the present application when a pilot valve is in an untriggered state;

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

[0031] Figure 7 is Figure 6 a sectional view schematic diagram of B-B in FIG.

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

[0033] Reference signs:

[0034] 10, cylinder assembly; 11, cylinder body; 11a, piston cavity; 12, end cover; 12a, first flow channel; 12b, second flow channel; 13, piston; 20, reversing system; 21, valve block; 21a, intake port; 21b, return port; 21c, main port; 21d, exhaust port; 21e, third flow channel; 22, pneumatic control valve; 23, pilot valve; 231, valve body; 231a, intake ring groove; 231b, control ring groove; 231c, exhaust ring groove; 231d, second sealing groove; 231e, third sealing groove; 232, valve stem; 232a, limiting hole; 232b, first abutting portion; 232c, second abutting portion; 233, valve cover; 233a, mounting hole; 233b, first sealing cavity; 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, objectives and effects of the present application, the specific embodiments of the present application will be described in detail with reference to the drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "upper", "lower", "left", "right", "vertical", "horizontal", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail" and the like are based on the directions or positional relationships shown in the drawings, constructed and operated in a particular direction, and are only for the convenience of describing the technical solutions, and should not be construed as indicating that the devices or elements referred to must have a particular direction, therefore, it should not be construed as a limitation on the present application.

[0036] It should also be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing", "setting" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. When an element is referred to as "on" or "below" another element, the element can be "directly" or "indirectly" located on the other element, or one or more intermediate elements can be present. The terms "first", "second", "third" and the like are only for the convenience of describing the technical solutions, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features with "first", "second", "third" and the like can be explicitly or implicitly included one or more of the features. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular architectures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known methods, devices, circuits, and

[0038] Please refer to Figures 1 to 8 The application provides an automatic reversing pneumatic motor, which comprises a cylinder assembly 10 and a reversing system 20. The cylinder assembly 10 comprises a cylinder body 11, a piston 13 and two end covers 12, which are arranged at two ends of the cylinder body 11 in a first direction to form a closed piston cavity 11a in the cylinder body 11. The piston 13 is arranged in the piston cavity 11a in a reciprocating sliding manner and divides the piston cavity 11a into two independent chambers. The reversing system 20 comprises a valve distribution block 21, a gas control valve 22 connected to the valve distribution block 21 and a pilot valve 23 arranged on the corresponding end cover 12. The valve distribution block 21 is arranged on the outer circumferential side of the cylinder body 11 and is provided with an air inlet channel 21a, an air return channel 21b, a main air channel 21c and an air exhaust channel 21d. The main air channel 21c is connected to the chambers. The pilot valve 23 comprises a valve body 231 and a valve rod 232 arranged on the valve body 231 in a slidable manner. The outer circumferential surface of the valve body 231 is sequentially provided with an air inlet ring groove 231a, an air exhaust ring groove 231c and a control ring groove 231b in the first direction. The air inlet ring groove 231a is connected to the air inlet channel 21a. The air return channel 21b is connected to the pilot cavity of the gas control valve 22 through the control ring groove 231b. The air exhaust ring groove 231c is connected to the air exhaust channel 21d. The part of the valve rod 232 that extends out of the valve body 231 extends into the chambers.

[0039] The valve rod 232 is driven to maintain the alternative connection state between the air inlet ring groove 231a and the air exhaust ring groove 231c.

[0040] The automatic reversing pneumatic motor of the embodiment is provided with corresponding pilot valves 23 on the two end covers 12, and the part of the valve rod 232 of the pilot valve 23 extending out of the valve body 231 is inserted into the chamber, so that the piston 13 slides in the piston cavity 11a and abuts against the valve rod 232, and drives the valve rod 232 to slide in the valve body 231, thereby keeping the selective communication state between the intake ring groove 231a and the exhaust ring groove 231c. If the valve rod 232 of one pilot valve 23 is abutted and driven by the piston 13, the intake ring groove 231a is in communication with the control ring groove 231b, at this time, the gas source in the valve distribution block 21 enters the intake ring groove 231a through the intake passage 21a, and flows out of the control ring groove 231b to the return passage 21b, and then enters the pilot cavity of the gas control valve 22 through the return passage 21b, thereby driving the valve shaft of the gas control valve 22 to move, so as to switch the gas source to enter the chamber in the compression state through the main gas passage 21c. If the valve rod 232 of the other pilot valve 23 is not driven by the piston 13, the exhaust ring groove 231c is in communication with the control ring groove 231b, and the gas source in the valve distribution block 21 cannot enter the pilot valve 23, but only the gas source in the gas control valve 22 enters the pilot valve 23 from the control ring groove 231b and flows out of the exhaust ring groove 231c to the gas control valve 22, so that the pilot cavity of the gas control valve 22 is in communication with the exhaust passage 21d, thereby allowing the gas source in the chamber in the expansion state to enter the valve distribution block 21 through the main gas passage 21c, and then being discharged to the atmosphere through the exhaust passage 21d. The piston 13 can be moved by using the pressure to realize the automatic reversing of the pneumatic motor, instead of the traditional reversing mode relying on electrical components, without being affected by the external magnetic field environment, and has the advantages of sensitive reversing action, high reliability, low failure rate and long service life.

[0041] In order to facilitate the maintenance of the piston 13, the connection between the two end covers 12 and the cylinder body 11 is detachable, which can include but is not limited to clamping, bolt connection, etc. In actual application, the fixed holes are arranged on the part of the two end covers 12 extending to the periphery of the cylinder body 11, and the two ends of the pull rod bolt 80 are connected with the fixed holes of the two end covers 12 respectively, so as to realize the detachable connection of the two end covers 12 at the two ends of the cylinder body 11.

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

[0043] In addition, the gas control valve 22 of the embodiment is a two-position five-way valve, and the specific structure and connection mode can adopt the prior art, which will not be described here.

[0044] In an embodiment, the portion of the valve rod 232 located in the valve body 231 is provided with a first abutting portion 232b and a second abutting portion 232c along the circumference thereof, the first abutting portion 232b is used to block the intake ring groove 231a, the second abutting portion 232c is used to block the exhaust ring 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 communicate the control ring groove 231b with the intake ring groove 231a or the exhaust ring groove 231c. That is, by driving the sliding of the valve rod 232, so that the first abutting portion 232b and the second abutting portion 232c can be used to alternately block the intake ring groove 231a and the exhaust ring groove 231c respectively, and then the gas path state can be dynamically adjusted according to the position of the valve rod 232, realizing the accurate control and efficient switching of the gas path.

[0045] In an embodiment, the pilot valve 23 further comprises a valve cover 233, which is connected to one end of the valve body 231 close to the end cover 12 and 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 arranged between the valve cover and the valve rod 232. In this way, by arranging 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 with 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 face contact is ingeniously used to prevent gas leakage. In addition, the reset elastic member can provide a stable reset force for the valve rod 232, ensuring that the valve rod 232 can quickly and accurately return to the initial position after triggering, and ensuring the timeliness and consistency of the annular direction of the pneumatic motor.

[0046] In an embodiment, the valve cover 233 is provided with a mounting hole 233a on the end face thereof facing the valve body 231, and the valve rod 232 is provided with a limiting hole 232a at one end close to the valve cover 233, 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 fixed in the mounting hole 233a and the limiting hole 232a, which can reduce the stress concentration of the reset elastic member in long-term reciprocating motion, effectively prolong the service life, and also ensure the stable fixation and efficient reset function of the reset elastic member.

[0047] In addition, the reset elastic member described above can be a compression spring in the prior art, or an elastic component that can reset the valve rod 232, which is not limited.

[0048] In one embodiment, the valve cover 233 has a first sealing groove along its circumference at the end connected to the valve body 231. 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 seal, which can effectively prevent gas leakage from the connection between the valve cover 233 and the valve body 231, ensuring the pressure stability of the gas circuit system.

[0049] In one embodiment, the outer periphery of the valve body 231 is provided with a plurality of second sealing grooves 231d distributed along a first 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 cap 12. And / or, the inner side of the valve body 231 is provided with a plurality of third sealing grooves 231e distributed along the first 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 abutment portion 232b or the second abutment portion 232c.

[0050] It should be noted that the term "and / or" mentioned above is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects are in an "or" relationship. A radial seal is formed by the second sealing ring 50 on the outer periphery of the valve body 231 contacting the end cover 12 to prevent air leakage from the assembly gap between the valve body 231 and the end cover 12. Simultaneously, an axial seal is formed by the third sealing ring 60 on the inner side of the valve body 231 contacting the first abutment portion 232b or the second abutment portion 232c to prevent cross-contamination of the air source between the inlet ring groove 231a and the exhaust ring groove 231c during the movement of the valve stem 232. In other words, in this embodiment, a second sealing ring 50 and a third sealing ring 60 are provided simultaneously to achieve efficient sealing of the pneumatic motor's air circuit. This combination of static sealing reliability and dynamic operating condition adaptability can effectively solve the problems of low energy efficiency and high failure rate caused by poor sealing in existing pneumatic motors.

[0051] The second direction mentioned above intersects with the first direction. The second direction is a hypothetical feature designed to facilitate the description of the positional relationships between components; see reference for details. 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 (for example, neoprene rubber, fluororubber, etc.), so that the gap fluctuation caused by mechanical vibration or temperature change can be compensated, thereby maintaining long-term sealing effect.

[0053] In actual application, the main gas passage 21c on the gas distribution block 21 is used for introducing the gas source into the chamber or discharging the gas source in the chamber. Therefore, it is necessary to ensure that the main gas passage 21c is in communication with the chamber, so that the gas source can be normally introduced or discharged. Therefore, in an embodiment, the end cover 12 is provided with a first flow passage 12a and a second flow passage 12b in communication. The first flow passage 12a penetrates the end cover 12 along a first direction and is in communication with the chamber. The second flow passage 12b extends along a second direction and penetrates the end cover 12 for the side surface connected with the gas distribution block 21, and the second flow passage 12b is in communication with the main gas passage 21c. That is to say, when it is necessary to introduce the gas source into the chamber to drive the piston 13 to move, the gas source introduced into the gas distribution block 21 flows into the second flow passage 12b through the main gas passage 21c, and then flows from the second flow passage 12b to the first flow passage 12a, and finally enters the chamber, thereby completing the introduction of the gas source into the chamber. When it is necessary to discharge the gas source in the chamber, the gas source in the chamber flows from the first flow passage 12a to the second flow passage 12b, and then flows from the second flow passage 12b to the main gas passage 21c and enters the gas distribution block 21, and finally is discharged into the atmosphere through the exhaust passage 21d. In addition, the gas distribution block 21 can be fixed by screwing, 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 gas outlet of the main gas passage 21c on the gas distribution block 21 is opposite to the second flow passage 12b, and then the bolt penetrates the gas distribution block 21 and extends into the bolt hole of the end cover 12, thereby realizing the detachable connection of the gas distribution block 21 on the outside of the cylinder body 11, which is simple in structure and convenient to disassemble and assemble.

[0054] In an embodiment, the gas distribution block 21 is provided with a third flow passage 21e, the third flow passage 21e is in communication with the inlet passage 21a, and the surface of the gas distribution block 21 connected with the gas control valve 22 is provided with a gas passage hole, the gas passage hole is used for connecting the gas inlet of the gas control valve 22 with the third flow passage 21e. That is to say, by providing the third flow passage 21e on the gas distribution block 21, the external gas source can flow into the third flow passage 21e, and the gas source is divided into two paths through the inlet passage 21a and the gas passage hole, one path of the gas source flows into the pilot valve 23 through the inlet passage 21a, and the other path flows into the gas control valve 22 through the gas inlet of the gas control valve 22, thereby driving the valve shaft of the gas control valve 22 to move by using the introduced gas source, so as to realize the switching of the gas source introduced into the corresponding chamber.

[0055] In one embodiment, a muffler 24 is connected to the outlet of the exhaust passage 21d, and the muffler 24 is used to perform noise reduction on the gas exhausted to the atmosphere. In actual application, when the gas source is exhausted by the exhaust passage 21d, a large noise is usually generated. In this embodiment, the muffler 24 is connected to the outlet of the exhaust passage 21d, and the muffler 24 is used to suppress the flow vibration and turbulent noise of the gas exhausted at high speed, so that the exhaust noise can be significantly reduced.

[0056] In one embodiment, the automatic reversing pneumatic motor further comprises a piston rod 80, the piston rod 80 is arranged in the piston cavity 11a in the first direction, one end of the piston rod 80 penetrates one of the two end covers 12, and the piston 13 is sleeved on the piston rod 80. That is, by arranging the piston rod 80 in the predetermined direction (i.e. the first direction), a rigid guide for the movement of the piston 13 is provided, so that the piston 13 is prevented from being laterally deviated or stuck during the sliding process in the cylinder 11, the accuracy and consistency of the movement track are ensured, and the operation stability of the pneumatic motor is improved. In addition, in actual application, the piston 13 is fixed on the piston rod 80 in a threaded connection manner, so that when the piston 13 is pushed to move, the piston rod 80 slides relative to the end cover 12, and then the piston 13 and the piston rod 80 as a whole move.

[0057] It can be understood that the above embodiments only express the preferred embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the patent of the present application; it should be pointed out that for ordinary skilled in the art, the above technical features can be freely combined without departing from the concept of the present application, and some modifications and improvements can be made, which all belong to the protection scope of the present application; therefore, any equivalent transformation and modification within the scope of the claims of the present application shall belong to the scope of the claims of the present application.

Claims

1. An automatically reversing pneumatic motor characterized by, The application relates to a cylinder assembly and a pilot valve thereof. The cylinder assembly comprises a cylinder body, a piston and two end covers, the two end covers are arranged at two ends of the cylinder body in a first direction to form a closed piston cavity in the cylinder body, the piston is arranged in the piston cavity and divides the piston cavity into two independent chambers, and the piston can slide reciprocally. The reversing system comprises a valve block, a pneumatic control valve connected to the valve block and a pilot valve arranged on a corresponding end cover, the valve block is arranged on the outer periphery of the cylinder body, the valve block is provided with an air inlet channel, an air return channel, a main air channel and an air outlet channel, and the main air channel is connected with the chambers. The pilot valve comprises a valve body and a valve rod slidably arranged on the valve body, the outer periphery of the valve body is sequentially provided with an air inlet ring groove, an air outlet ring groove and a control ring groove in the first direction, the air inlet ring groove is connected with the air inlet channel, the air return channel is connected with a pilot cavity of the pneumatic control valve through the control ring groove, the air outlet ring groove is connected with the air outlet channel, and the part of the valve rod penetrating out of the valve body extends into the chamber. The valve rod can be driven to keep the selective connection state between the air inlet ring groove and the air outlet ring groove. The part of the valve rod in the valve body is provided with a first abutting portion and a second abutting portion along the circumference, the first abutting portion is used for plugging the air inlet ring groove, the second abutting portion is used for plugging the air outlet ring groove, and an annular flow channel is defined between the first abutting portion and the second abutting portion to connect the control ring groove with the air inlet ring groove or the air outlet ring groove.

2. The automatic reversing pneumatic motor of claim 1, wherein, The end cover is provided with a first flow channel and a second flow channel connected with each other, the first flow channel penetrates through the end cover in the first direction and is connected with the chamber, the second flow channel extends in a second direction and penetrates through the side of the end cover connected with the valve block, and the second flow channel is connected with the main air channel; wherein the second direction intersects with the first direction.

3. The automatic reversing pneumatic motor of claim 2, wherein, The pilot valve further comprises a valve cover 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 face of the end cover, and a reset elastic member is arranged between the valve cover and the valve rod.

4. The automatic reversing pneumatic motor of claim 2, wherein, The valve cover is provided with a mounting hole on the end face of the valve body, one end of the valve rod is provided with a limiting hole, 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 of claim 4, wherein, The end of the valve cover connected with the valve body is provided with a first sealing groove along the circumference, a first sealing ring is fixed in the first sealing groove, and the part of the first sealing ring protruding from the first sealing groove abuts against the end face of the valve body. The outer periphery of the valve body is provided with a plurality of second sealing grooves distributed in the first direction along the circumference, a second sealing ring is fixed in the second sealing groove, and the part of the second sealing ring protruding from the second sealing groove abuts against the end cover; and / or, The inner side surface of the valve body is provided with a plurality of third sealing grooves distributed in the first direction in the circumferential direction, a third sealing ring is fixed in the third sealing groove, and the part of the third sealing ring protruding from the third sealing groove is in contact with the first abutting portion or the second abutting portion.

6. The automatic reversing pneumatic motor of claim 1, wherein, The gas distribution block is provided with a third flow channel, the third flow channel is in communication with the gas inlet channel, a ventilation hole is formed in the surface of the gas distribution block connected with the pneumatic valve, and the ventilation hole is used for connecting the gas inlet of the pneumatic valve with the third flow channel.

7. The automatic reversing pneumatic motor of claim 1, wherein, The exhaust outlet of the exhaust channel is connected with a silencer, and the silencer is used for silencing the gas discharged to the atmosphere.

8. The automatic reversing pneumatic motor of claim 1, wherein, The automatic reversing pneumatic motor further comprises a piston rod, the piston rod is arranged in the piston cavity in the first direction, one end of the piston rod penetrates one of the two end covers, and the piston sleeve is connected to the piston rod.

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