Dual air circuit pneumatic chuck

Abstract

The present invention discloses a dual-circuit pneumatic chuck, comprising: a main body, a front chamber and a rear chamber are arranged inside the main body, the front chamber and the rear chamber are connected, a slot is arranged on the side wall of the front chamber, a first air inlet hole and a second air inlet hole are arranged in the rear chamber, the first air inlet hole connects the rear end of the rear chamber with the outside, and the second air inlet hole connects the front end of the rear chamber with the outside; a piston, which can be movably arranged in the rear chamber, a sealing structure is arranged on the outer side wall of the piston, and the sealing structure separates the first air inlet hole from the second air inlet hole; a slider, which is connected to the front end of the piston, the slider can be movably arranged in the front chamber, the outer side wall of the slider is provided with an inclined surface, and the inclined surface faces the slot; a convex key, which can be arranged in the slot in and out, and the bottom of the convex key is against the inclined surface. In the dual-circuit pneumatic chuck of the present invention, the piston has a fast moving speed of resetting backward, which helps the dual-circuit pneumatic chuck to quickly release the coil. The present invention can be applied to the technical field of winding equipment.

Description

Technical Field

[0001] The invention relates to the technical field of winding equipment, in particular to a double-air-path pneumatic chuck. Background Art

[0002] The coiling of the coil usually uses a pneumatic chuck, which uses compressed air as a power source to expand the outer diameter of the pneumatic chuck and clamp the coil of the coil. The existing pneumatic chuck uses compressed air to push the piston in the cylinder forward, and a compression spring is provided at the front end of the piston to drive the piston to reset backward. However, the speed at which the compression spring drives the piston to reset backward is slow. Summary of the invention

[0003] The purpose of the present invention is to provide a dual-air-circuit pneumatic chuck to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0004] The technical solutions adopted to solve the above technical problems are:

[0005] A dual-air-circuit pneumatic chuck, comprising:

[0006] A main body, wherein a front chamber and a rear chamber are provided inside the main body, the front chamber and the rear chamber are connected, a side wall of the front chamber is provided with a groove, the groove connects the front chamber with the outside, and the position of the front chamber relative to the rear chamber is taken as a relative front direction, the rear chamber is provided with a first air inlet hole and a second air inlet hole, the first air inlet hole connects the rear end of the rear chamber with the outside, and the second air inlet hole connects the front end of the rear chamber with the outside;

[0007] A piston is movably disposed in the rear chamber, and an outer wall of the piston is provided with a sealing structure, the sealing structure surrounds the outer circumference of the piston, the sealing structure seals the gap between the outer wall of the piston and the inner wall of the rear chamber, and the sealing structure separates the first air inlet hole from the second air inlet hole;

[0008] A slider connected to the front end of the piston, the slider is arranged in the front chamber so as to be movable forward and backward, an outer side wall of the slider is provided with an inclined surface, the inclined surface is inclined in a direction away from the slider from front to back, and the inclined surface faces the slot;

[0009] A convex key is arranged in the slot in an inward and outward manner, and the bottom of the convex key abuts against the inclined surface.

[0010] The beneficial effects of the present invention are as follows: the sealing structure on the periphery of the piston separates the first air inlet hole and the second air inlet hole of the rear chamber. When the coil needs to be clamped, the second air inlet hole is opened, and gas is introduced into the first air inlet hole, the compressed gas pushes the piston forward, the piston pushes the slider forward in the front chamber, and the inclined surface of the slider pushes the cam to expand outward along the groove, so that the dual-circuit pneumatic chuck clamps the coil; when the piston needs to be reset, the first air inlet hole is opened, and gas is introduced into the second air inlet hole, the compressed gas pushes the piston backward, the piston pushes the slider backward in the front chamber, and the cam is recovered along the groove, so that the dual-circuit pneumatic chuck releases the coil, and the piston moves backward at a faster speed, which helps the dual-circuit pneumatic chuck to quickly release the coil.

[0011] As a further improvement of the above technical solution, the sealing structure includes an annular protrusion, which is arranged around the outer circumference of the piston, and the outer wall of the annular protrusion is tightly fitted with the inner wall of the rear chamber.

[0012] The outer wall of the annular protrusion fits tightly with the inner wall of the rear chamber, so that the first air inlet hole and the second air inlet hole are separated by the annular protrusion. When gas is introduced into the first air inlet hole or the second air inlet hole, the annular protrusion isolates the gas, so that the piston can be pushed by the gas and move in the front-to-back direction. The piston has a simple structure and is easy to manufacture.

[0013] As a further improvement of the above technical solution, the sealing structure also includes

[0014] A first annular groove, which is arranged around the outer circumference of the piston, and the first annular groove is located at the front side or the rear side of the annular protrusion;

[0015] A first sealing strip is disposed in the first annular groove, and the first sealing strip seals a gap between the first annular groove and an inner side wall of the rear chamber.

[0016] A first annular groove is arranged on the front side or the rear side of the annular protrusion, and a first sealing strip in the first annular groove seals the gap between the first annular groove and the inner wall of the rear chamber, thereby improving the sealing performance between the outer wall of the piston and the inner wall of the rear chamber.

[0017] As a further improvement of the above technical solution, there are at least two first annular grooves, which are respectively arranged on the front and rear sides of the annular protrusion, and there are at least two first sealing strips, which are arranged in a one-to-one correspondence with the first annular grooves.

[0018] The two first annular grooves are respectively arranged at the front side and the rear side of the annular protrusion, and the two first sealing strips seal the gap between the front side and the rear side of the annular protrusion to avoid loss of sealing effect after the annular protrusion is worn.

[0019] As a further improvement of the above technical solution, the slider includes:

[0020] A sliding body, wherein the cross-sectional shape of the sliding body matches the cross-sectional shape of the front chamber, the sliding body can move forward and backward along the front chamber, and the outer side wall of the sliding body is provided with a second annular groove, and the second annular groove surrounds the outer circumference of the sliding body;

[0021] A second sealing strip is disposed in the second annular groove, and the second sealing strip seals a gap between an outer side wall of the sliding body and an inner side wall of the front chamber.

[0022] The second sealing strip is arranged in the second annular groove on the outer wall of the sliding body. The second sealing strip seals the gap between the outer wall of the sliding body and the inner wall of the front chamber. When the gas enters the rear chamber from the second air inlet hole, the gas in the rear chamber is prevented from leaking along the gap between the outer wall of the sliding body and the inner wall of the front chamber, so that the piston can move backward and reset more smoothly.

[0023] As a further improvement of the above technical solution, the slider also includes a frustum body, which is arranged at the front end of the sliding body, the inclined surface is the outer surface of the frustum body, there are multiple grooves, all of which are distributed at intervals along the circumference of the main body, and all of the grooves are arranged around the periphery of the inclined surface. There are multiple convex keys, and the convex keys are arranged one-to-one with the grooves.

[0024] The outer side surface of the truncated cone body at the front end of the sliding body forms an inclined surface, and multiple grooves are arranged around the outer periphery of the inclined surface. Multiple convex keys are arranged in the grooves one by one. When the slider moves forward, the inclined surface of the truncated cone body can push the multiple convex keys to expand outward, so that the tightening force on the outer periphery of the dual-circuit pneumatic chuck is more uniform.

[0025] As a further improvement of the above technical solution, taking the position of the convex key relative to the slider as the relative upward direction, the convex key includes:

[0026] A wedge-shaped body, the bottom surface of which is inclined in a direction away from the slider from front to back, and the bottom surface of the wedge-shaped body abuts against the inclined surface;

[0027] A pressing block is detachably connected to the top of the wedge-shaped body.

[0028] The convex key is composed of a wedge-shaped body and a pressure block. The wedge-shaped body cooperates with the inclined surface of the slider. The pressure block is arranged on the top of the wedge-shaped body. When the convex key expands outward, the pressure block often contacts the inner tube of the coil. The pressure block is easily damaged by the pressure of the inner tube and the coil. The pressure block and the wedge-shaped body are detachably connected to facilitate the replacement of the pressure block.

[0029] As a further improvement of the above technical solution, the top surface of the pressing block is provided with an anti-slip structure.

[0030] The top surface of the pressing block is provided with an anti-skid structure, which contacts the inner tube of the coil, thereby increasing the static friction between the anti-skid structure and the inner tube of the coil, so that the inner tube of the coil is not easy to separate from the pressing block.

[0031] As a further improvement of the above technical solution, the sliding block is detachably connected to the piston.

[0032] The inclined surface of the slider often rubs against the cam, and the inclined surface is easy to wear, and the sealing structure of the piston often rubs against the inner wall of the rear chamber, and the sealing structure is easy to wear. The slider and the piston are detachably connected, making the replacement of the slider or the piston more convenient, and the slider or the piston can be replaced separately, saving costs.

[0033] As a further improvement of the above technical solution, the outer wall of the main body is provided with a concave cavity, and the dual-path pneumatic chuck further includes a rolling body, which is rotatably arranged in the concave cavity, and the outer wall of the rolling body protrudes from the outer wall of the main body.

[0034] The rolling body is rotatably arranged in the concave cavity of the outer wall of the main body, and the outer wall of the rolling body protrudes from the outer wall of the main body. When the coil is loaded into the main body or taken out from the main body, the rolling body supports the inner cylinder of the coil. When the coil moves relative to the main body, the rolling body enables the inner cylinder of the coil to move smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments;

[0036] Figure 1 It is a structural schematic diagram of an embodiment of the dual-air-circuit pneumatic chuck provided by the present invention, wherein the piston moves forward;

[0037] Figure 2 It is a structural schematic diagram of an embodiment of the dual-air-circuit pneumatic chuck provided by the present invention, wherein the piston moves backward;

[0038] Figure 3 It is a structural schematic diagram of another embodiment of the dual-air-circuit pneumatic chuck provided by the present invention, wherein the piston moves forward;

[0039] Figure 4 It is a structural schematic diagram of another embodiment of the dual-air-circuit pneumatic chuck provided by the present invention, wherein the piston moves backward.

[0040] 100. Main body, 110. Front chamber, 111. Groove, 120. Rear chamber, 121. First air inlet hole, 122. Second air inlet hole, 130. Concave cavity, 200. Piston, 210. Sealing structure, 211. Annular protrusion, 212. First annular groove, 213. First sealing strip, 300. Slider, 310. Sliding body, 311. Second annular groove, 312. Second sealing strip, 320. Cone body, 321. Inclined surface, 400. Key, 410. Wedge-shaped body, 420. Pressing block, 500. Rolling body. DETAILED DESCRIPTION

[0041] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0042] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0043] In the description of the present invention, if there are words such as "several", it means one or more, "more" means more than two, greater than, less than, exceed, etc. are understood as not including the number, and above, below, within, etc. are understood as including the number.

[0044] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0045] Reference Figures 1 to 4 The dual-air-circuit pneumatic chuck of the present invention is implemented as follows:

[0046] The dual-circuit pneumatic chuck includes a main body 100, a piston 200, a slider 300, and a convex key 400. The main body 100 is divided into two sections, the front section of the main body 100 is cylindrical in shape, and the shape of the front section of the main body 100 matches the shape of the roll of the coiled material. The main body 100 is provided with a front chamber 110 and a rear chamber 120 inside. The front chamber 110 is located in front of the rear chamber 120, and the front chamber 110 is connected with the rear chamber 120. The cross-sectional shapes of the front chamber 110 and the rear chamber 120 are both circular. The axis of the front chamber 110 and the axis of the rear chamber 120 are located on the same straight line, and the diameter of the rear chamber 120 is larger than the diameter of the front chamber 110. A plurality of slots 111 are provided on the side wall of the front chamber 110, and the slots 111 connect the front chamber 110 with the outside, and all the slots 111 are evenly distributed around the periphery of the front chamber 110. A first air inlet hole 121 is formed on the rear wall of the rear chamber 120, and the first air inlet hole 121 connects the rear end of the rear chamber 120 with the outside. A second air inlet hole 122 is formed on the side wall of the rear chamber 120, and the second air inlet hole 122 connects the front end of the rear chamber 120 with the outside. A plurality of concave cavities 130 are provided on the outer wall of the front section of the main body 100, and all the concave cavities 130 are evenly distributed around the outer circumference of the main body 100. An axial hole is provided on the side wall of the concave cavity 130, and the axial direction of the axial hole is perpendicular to the axial direction of the front section of the main body 100. The rolling body 500 is rotatably arranged in the concave cavity 130. The rolling body 500 is composed of a rolling bearing and a rotating shaft. The rotating shaft is inserted into the axial hole of the concave cavity 130, and the inner ring of the rolling bearing is sleeved on the rotating shaft. The outer wall of the outer ring of the rolling bearing extends out of the concave cavity 130, and the outer ring of the rolling bearing protrudes from the outside of the front section of the main body 100. The rotation axis of the rolling bearing is perpendicular to the axial direction of the front section of the main body 100. The reel of the coiled material is sleeved on the front section of the main body 100. When the reel moves relative to the main body 100, the rolling body 500 can rotate in the moving direction of the reel.

[0047] The piston 200 is cylindrical in shape. The piston 200 is arranged in the rear chamber 120 so as to be movable forward and backward. A sealing structure 210 is arranged on the outer wall of the piston 200. The sealing structure 210 surrounds the outer circumference of the piston 200. The sealing structure 210 includes an annular protrusion 211, a first annular groove 212, and a first sealing strip 213. The annular protrusion 211 surrounds the circumference of the sealing structure 210. The outer wall of the annular protrusion 211 protrudes outward and fits tightly with the inner wall of the rear chamber 120. The front and rear ends of the annular protrusion 211 are chamfered. When the outer wall of the annular protrusion 211 fits the inner wall of the rear chamber 120 and moves forward and backward, the chamfer can prevent the front and rear edges of the annular protrusion 211 from scratching the inner wall of the rear chamber 120. Generally, grease is filled between the outer wall of the annular protrusion 211 and the inner wall of the rear chamber 120, and the grease enables the annular protrusion 211 to slide forward and backward relative to the inner wall of the rear chamber 120. The first annular groove 212 surrounds the piston 200 in a circle, and there are two first annular grooves 212, which are located at the front and rear sides of the annular protrusion 211 respectively. There are two first sealing strips 213, which are respectively arranged in the two first annular grooves 212. The first sealing strips 213 are pressed between the inner side wall of the rear chamber 120 and the bottom wall of the first annular groove 212. The first sealing strips 213 seal the gap between the first annular groove 212 and the inner side wall of the rear chamber 120. Grease can be filled in the first annular groove 212, so that the grease is wrapped in the first sealing strip 213, and the grease is filled between the first sealing strip 213 and the inner side wall of the rear chamber 120, so that the first sealing strip 213 can slide forward and backward relative to the inner side wall of the rear chamber 120. The first air inlet 121 is located behind the sealing structure 210, and the second air inlet 122 is located in front of the sealing structure 210, that is, the sealing structure 210 separates the first air inlet 121 from the second air inlet 122.

[0048] The rear end of the slider 300 is provided with a screw hole, and the piston 200 is provided with a through hole that penetrates in the front-to-back direction. The slider 300 and the piston 200 are detachably connected by screws passing through the through holes and then connected to the screw holes, and the slider 300 is connected to the front end of the piston 200. The slider 300 extends from the rear chamber 120 into the front chamber 110. The slider 300 includes a sliding body 310 and a frustum body 320. The frustum body 320 is arranged on the front side of the sliding body 310. The sliding body 310 has a cylindrical shape. The cross-sectional shape of the sliding body 310 matches the cross-sectional shape of the front chamber 110. The outer wall of the sliding body 310 is tightly fitted with the inner wall of the front chamber 110. Grease is filled between the outer wall of the sliding body 310 and the inner wall of the front chamber 110. The sliding body 310 can move forward and backward along the inner wall of the front chamber 110. The outer wall of the sliding body 310 is provided with a grease. The sliding body 310 can move forward and backward along the inner wall of the front chamber 110. A second annular groove 311 is provided on the side wall, and the second annular groove 311 surrounds the outer circumference of the sliding body 310. A second sealing strip 312 is provided in the second annular groove 311. The second sealing strip 312 is pressed between the inner wall of the front chamber 110 and the outer wall of the sliding body 310. The second sealing strip 312 seals the gap between the outer wall of the sliding body 310 and the inner wall of the front chamber 110. Grease is filled in the second annular groove 311. The grease wraps the second sealing strip 312 so that the second sealing strip 312 can slide back and forth relative to the inner wall of the front chamber 110. The frustum body 320 is disposed at the front end of the sliding body 310. The frustum body 320 is located inside the front chamber 110. The outer shape of the frustum body 320 is a frustum that is small at the front and large at the back. The outer diameter of the frustum body 320 is smaller than the outer diameter of the sliding body 310. The frustum body 320 can move back and forth in the front chamber 110. The outer wall of the frustum body 320 is a slope 321. The slope 321 is inclined in the direction from front to back toward the direction away from the slider 300, and all the grooves 111 are arranged around the outer periphery of the slope 321.

[0049] The convex key 400 is disposed in the slot 111. The convex key 400 can move along the slot 111. The convex key 400 can extend out of the slot 111 or be retracted into the slot 111. There are multiple convex keys 400, and the convex keys 400 are disposed one by one corresponding to the slots 111. The convex key 400 includes a wedge-shaped body 410 and a pressing block 420. With the position of the convex key 400 relative to the slider 300 as the relative upper direction, the wedge-shaped body 410 is a wedge-shaped structure. The bottom surface of the wedge-shaped body 410 is inclined in the direction away from the slider 300 from the front to the back, and the bottom surface of the wedge-shaped body 410 is against the inclined surface 321. The pressing block 420 is arranged on the top of the wedge-shaped body 410 and is screwed to the top of the wedge-shaped body 410. When the slider 300 moves forward, the inclined surface 321 pushes the wedge-shaped body 410 upward, so that the pressing block 420 extends out of the slot 111. When the slider 300 moves backward, the wedge-shaped body 410 moves downward along the inclined surface 321, so that the pressing block 420 is recovered into the slot 411. The top surface of the pressing block 420 is provided with an anti-skid structure, which is an anti-skid rubber.

[0050] When the double-circuit pneumatic chuck needs to load the roll of the coiled material, the roll is placed opposite to the front section of the main body 100. The rolling body 500 of the front section of the main body 100 allows the roll to move backward along the outer wall of the main body 100 more smoothly. After the roll is sleeved on the front section of the main body 100, the second air inlet 122 is opened, and compressed gas is filled into the first air inlet 121. The compressed gas enters the rear chamber 120 from the rear end, and the compressed gas pushes the piston 200 to move forward. The piston 200 drives the slider 300 to move forward. The inclined surface 321 of the truncated cone 320 pushes the convex key 400 to move outward along the slot 111, and the convex key 400 expands outward, and the pressing block 420 of the convex key 400 clamps the roll; the double-circuit pneumatic chuck needs When taking down the roll of coiled material, open the first air inlet 121 and fill the second air inlet 122 with compressed gas, the compressed gas enters the rear chamber 120 from the front end, the compressed gas pushes the piston 200 to move backward, the piston 200 drives the slider 300 to move backward, the cone body 320 moves backward to make the cam 400 move inward along the inclined surface 321, then the cam 400 is recovered along the groove 111 to the inside of the groove 111, so that the pressure block 420 of the cam 400 releases the roll, and then the roll can be pushed to move forward relative to the main body 100, the rolling body 500 at the front section of the main body 100 makes the roll move forward more smoothly along the outer wall of the main body 100, and finally the roll is detached from the front section of the main body 100.

[0051] In some embodiments, the sealing structure 210 can be in various forms. For example, the outer wall of the piston 200 is tightly fitted with the inner wall of the rear chamber 120, and grease is filled between the outer wall of the piston 200 and the inner wall of the rear chamber 120, so that the gap between the outer wall of the piston 200 and the inner wall of the rear chamber 120 is sealed, and the piston 200 can move back and forth along the inner wall of the rear chamber 120; or, an annular groove is provided on the outer wall of the piston 200, and the annular groove surrounds the outer circumference of the piston 200, and the annular groove is filled with a sealing ring, which seals the gap between the outer wall of the piston 200 and the inner wall of the rear chamber 120.

[0052] In some embodiments, the slider 300 has various structures. For example, the slider 300 is a cylindrical structure, and a groove is provided on the outer wall of the slider 300. The groove extends in the front-to-back direction, and the bottom wall of the groove is inclined in the direction away from the slider 300 from the front-to-back direction, so that the bottom wall of the groove forms a slope 321; or, the front end of the slider 300 is shaped like a prism, and the slope 321 is the outer side surface of the prism. The number of outer side surfaces of the prism corresponds to the number of grooves 111, and the outer side surface of the prism faces the groove 111.

[0053] In some embodiments, the structure of the key 400 is various, for example, the bottom surface of the key 400 is an arc surface to prevent the bottom edge of the key 400 from scratching the inclined surface 321, so that the key 400 can move smoothly along the inclined surface 321; or the bottom of the key 400 is a plane, and a pulley is provided at the bottom of the key 400, the pulley contacts the inclined surface 321 and supports the key 400, and the rotation axis of the pulley is perpendicular to the movement direction of the slider 300. When the slider 300 moves forward, the pulley can roll along the inclined surface 321 and drive the key 400 to move up and down along the slot 111, so that the key 400 can smoothly extend from the outside of the slot 111 or be recovered into the inside of the slot 111.

[0054] The preferred embodiments of the present invention are specifically described above, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A dual-air-circuit pneumatic chuck, characterized in that: include: A main body (100) is provided with a front chamber (110) and a rear chamber (120) therein, the front chamber (110) and the rear chamber (120) being in communication, a side wall of the front chamber (110) being provided with a groove (111), the groove (111) being in communication with the front chamber (110) and the outside world, with the position of the front chamber (110) relative to the rear chamber (120) being the relative front direction, the rear chamber (120) being provided with a first air inlet hole (121) and a second air inlet hole (122), the first air inlet hole (121) being in communication with the rear end of the rear chamber (120) and the outside world, and the second air inlet hole (122) being in communication with the front end of the rear chamber (120) and the outside world; A piston (200) is disposed in the rear chamber (120) so as to be movable forward and backward, and a sealing structure (210) is provided on the outer wall of the piston (200), and the sealing structure (210) surrounds the outer circumference of the piston (200). The sealing structure (210) seals a gap between the outer wall of the piston (200) and the inner wall of the rear chamber (120), and the sealing structure (210) separates the first air inlet hole (121) from the second air inlet hole (122); A slider (300) connected to the front end of the piston (200), the slider (300) being disposed in the front chamber (110) so as to be movable forward and backward, an outer side wall of the slider (300) being provided with an inclined surface (321), the inclined surface (321) being inclined in a direction away from the slider (300) from front to back, and the inclined surface (321) facing the slot (111); A convex key (400) is disposed in the slot (111) so as to be retractable, and the bottom of the convex key (400) abuts against the inclined surface (321); The sealing structure (210) comprises an annular protrusion (211), wherein the annular protrusion (211) is arranged around the outer circumference of the piston (200), and the outer wall of the annular protrusion (211) is tightly fitted with the inner wall of the rear chamber (120); The sliding block (300) is detachably connected to the piston (200).

2. The dual-air-circuit pneumatic chuck according to claim 1, characterized in that: The sealing structure (210) further includes A first annular groove (212) is arranged around the outer circumference of the piston (200), and the first annular groove (212) is located at the front side or the rear side of the annular protrusion (211); A first sealing strip (213) is disposed in the first annular groove (212), wherein the first sealing strip (213) seals a gap between the first annular groove (212) and an inner side wall of the rear chamber (120).

3. The dual-air-circuit pneumatic chuck according to claim 2, characterized in that: There are at least two first annular grooves (212), which are respectively arranged at the front side and the rear side of the annular protrusion (211); there are at least two first sealing strips (213), which are arranged in a one-to-one correspondence with the first annular grooves (212).

4. The dual-air-circuit pneumatic chuck according to claim 1, characterized in that: The slider (300) comprises: a sliding body (310), wherein the cross-sectional shape of the sliding body (310) matches the cross-sectional shape of the front chamber (110), the sliding body (310) can move forward and backward along the front chamber (110), and the outer side wall of the sliding body (310) is provided with a second annular groove (311), and the second annular groove (311) surrounds the outer circumference of the sliding body (310); A second sealing strip (312) is disposed in the second annular groove (311), and the second sealing strip (312) seals a gap between an outer side wall of the sliding body (310) and an inner side wall of the front chamber (110).

5. The dual-air-circuit pneumatic chuck according to claim 4, characterized in that: The slider (300) further comprises a truncated cone body (320), wherein the truncated cone body (320) is arranged at the front end of the sliding body (310), the inclined surface (321) is the outer surface of the truncated cone body (320), there are a plurality of slots (111), all of which are spaced apart along the circumference of the main body (100), and all of which are arranged around the periphery of the inclined surface (321), and there are a plurality of convex keys (400), and the convex keys (400) are arranged in a one-to-one correspondence with the slots (111).

6. The dual-air-circuit pneumatic chuck according to claim 1, characterized in that: Taking the position of the convex key (400) relative to the sliding block (300) as the relative upward direction, the convex key (400) comprises: A wedge-shaped body (410), the bottom surface of which is inclined in a direction away from the sliding block (300) from front to back, and the bottom surface of the wedge-shaped body (410) abuts against the inclined surface (321); A pressing block (420) is detachably connected to the top of the wedge-shaped body (410).

7. The dual-air-circuit pneumatic chuck according to claim 6, characterized in that: The top surface of the pressing block (420) is provided with an anti-slip structure.

8. The dual-air-circuit pneumatic chuck according to claim 1, characterized in that: The outer wall of the main body (100) is provided with a concave cavity (130), and the dual-air-circuit pneumatic chuck further comprises a rolling body (500), the rolling body (500) is rotatably arranged in the concave cavity (130), and the outer wall of the rolling body (500) protrudes from the outer wall of the main body (100).

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