Mechanical locking type pneumatic tool

Abstract

The mechanical locking type pneumatic tool comprises a cylinder body, a piston assembly, a locking assembly and an extrusion assembly, the piston assembly comprises a piston arranged in the cylinder body and a clamping rod connected with the piston, and the locking assembly is arranged outside the clamping rod in a sleeving mode and can deform in the radial direction so as to lock or loosen the piston assembly; the extrusion assembly comprises an extrusion sleeve and an elastic piece, the extrusion sleeve is arranged outside the locking assembly in a sleeving mode and can move in the axial direction to extrude or release the locking assembly so that the locking assembly can elastically deform, and the elastic piece is arranged between the extrusion sleeve and the inner wall of the cylinder body. The piston assembly is locked through the locking assembly, and after the locking action is completed, the piston assembly can be locked and fixed without conveying compressed air to the bottom of the piston assembly, so that the piston assembly is kept in a stable working posture, energy is saved, and the service life of the piston assembly is prolonged. And the axial retaining force and the stability of the piston assembly in the working state can be greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cylinders, in particular to a mechanically locked pneumatic tool. Background Art

[0002] A cylinder is a commonly used power component in mechanical equipment. It drives a piston to move by delivering compressed air into the cylinder body of a pneumatic tool, thereby driving a mechanism to achieve reciprocating linear motion, swinging, etc. Since the power source of the cylinder is compressed air, the magnitude of its output force depends on the air pressure at the working state and the acting area of the cylinder piston. However, in the actual working environment, the air pressure will fluctuate to a certain extent, which easily causes the holding force of the output force of the cylinder component acting on an object to fluctuate accordingly (for example, when the cylinder is used to clamp and fix an object, if the air pressure input to the bottom surface of the piston is unstable, the clamping force acting on the object will fluctuate, resulting in the inability to clamp the object firmly); secondly, air is a compressible medium. When subjected to a reverse acting force, the piston will have varying degrees of compression displacement problems caused by the reverse extrusion of the gas in the cylinder body, thus unable to fully ensure the stability of the output posture when the cylinder clamps and fixes an object.

[0003] In the prior art, to solve the above problems, usually, the cylinder diameter is increased or a multi-stage piston is provided to increase the acting area of the piston to improve the stability of the cylinder during operation. However, during the actual use process, the inventor found that although the above two methods can improve the output force and stability of the cylinder to a certain extent, they increase the volume of the cylinder, raise the manufacturing cost, and the usage occasions are also limited due to the excessive volume; secondly, since compressed air needs to be continuously delivered into the cylinder body during the working process, once the gas delivery is interrupted or the air pressure fluctuates, and affected by factors such as the reverse extrusion force of the load, the problem of unstable working posture of the cylinder will still occur. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a mechanically locked pneumatic tool, aiming to solve the above technical problems.

[0005] The technical problems solved by the utility model are realized by adopting the following technical solutions:

[0006] A cylinder body with a cavity therein;

[0007] A piston assembly, including a piston and a clamping rod, the piston is slidably disposed in the cavity, one end of the clamping rod is connected to the piston, and the other end extends outside the cylinder body;

[0008] A locking assembly, disposed in the cavity and above the piston, the locking assembly is sleeved outside the clamping rod, and the locking assembly can deform radially to lock or release the piston assembly;

[0009] The extrusion assembly includes an extrusion sleeve and an elastic member. The extrusion sleeve is sleeved outside the locking assembly and can axially move along the cavity to extrude or release the locking assembly, causing the locking assembly to elastically deform. The elastic member is arranged between the top wall of the cylinder block and one end of the extrusion sleeve facing away from the locking assembly.

[0010] In some embodiments, a first locking portion is provided on the clamping rod, and a second locking portion cooperating with the first locking portion is provided on the locking assembly;

[0011] When the extrusion assembly extrudes the locking assembly, the locking assembly becomes smaller inward in the radial direction, and the first locking portion and the second locking portion come into contact to lock the piston assembly;

[0012] When the extrusion assembly releases the locking assembly, the locking assembly becomes larger outward in the radial direction, and the first locking portion and the second locking portion separate to release the piston assembly.

[0013] In some embodiments, the locking assembly includes a locking ring with variable size, and the second locking portion is arranged inside the locking ring;

[0014] When the locking assembly is extruded, the locking ring shrinks inward in the radial direction, and the second locking portion contacts the first locking portion;

[0015] When the locking assembly is released, the locking ring becomes larger outward in the radial direction, and the second locking portion separates from the first locking portion.

[0016] In some embodiments, the locking ring includes at least two locking members. At least two locking members are connected by a connecting member to form the locking ring, and at least two locking members can approach or move away from each other to adjust the size of the locking ring.

[0017] In some embodiments, the first locking portion includes a recess concave in the outer peripheral side of the clamping rod, and a first locking inclined surface is formed on the recess;

[0018] The second locking portion includes a variable-size locking space. The inner wall of the locking space forms a second locking inclined surface, and the clamping rod penetrates through the locking space;

[0019] When the piston assembly is in a locked state, the locking space is hoop-shaped on the recess, and the second locking inclined surface abuts against the first locking inclined surface.

[0020] In some embodiments, a first inclined surface is provided on the outer peripheral side of the locking assembly and / or a second inclined surface is provided on the inner wall of the extrusion sleeve. The first inclined surface and / or the second inclined surface can cause the locking assembly to deform inward in the radial direction when being extruded by the extrusion sleeve.

[0021] In some embodiments, the cavity includes a first chamber and a second chamber that are sequentially distributed in the height direction and communicate with each other. The side wall of the cylinder block is provided with a first air hole communicating with the first chamber and a second air hole communicating with the second chamber.

[0022] The locking assembly and the pressing assembly are arranged in the first chamber.

[0023] The piston is arranged in the second chamber. One end of the clamping rod is connected to the piston, and the other end extends outside the cylinder block through the first chamber.

[0024] In some embodiments, a limiting plate is provided between the first chamber and the second chamber. The clamping rod penetrates through the limiting plate, and the limiting plate is provided with a ventilation hole communicating the first chamber and the second chamber.

[0025] In some embodiments, a wear-resistant ring is provided on the bottom surface of the first chamber in contact with the locking assembly.

[0026] In some embodiments, a ring groove adapted to the upper end of the locking assembly is provided at the bottom of the pressing sleeve. When the pressing assembly presses the locking assembly, the upper end of the locking assembly is placed in the ring groove.

[0027] The beneficial effects of the present utility model are as follows:

[0028] For the mechanical locking pneumatic tool of the present utility model, when the piston assembly is in the working state, the elastic member can drive the pressing sleeve to move towards the locking assembly and press the locking assembly, so that the locking assembly shrinks radially inwards and abuts against the outer wall of the piston assembly to lock and fix the piston assembly, thereby restricting the axial movement of the piston assembly. Since the locking mode between the locking assembly and the piston assembly is a mechanical locking mode, after the locking action is completed, it is not necessary to supply compressed air to the bottom of the piston assembly to lock and fix the piston assembly, so that the piston assembly maintains a stable working posture, which not only saves energy, but also the holding force during the operation of the pneumatic tool is not affected by the fluctuation of the air pressure, and the piston assembly will not have the problem of gas compression displacement due to the reverse pressing force, effectively improving the axial holding force and stability during the operation of the pneumatic tool. Secondly, compared with the traditional method of increasing the cylinder diameter or setting multiple pistons to increase the piston area to improve the holding force of the cylinder, the present utility model can achieve a strong holding force with a small-volume cylinder, which not only saves the manufacturing cost, but also the characteristic that the normal operation is not affected by the interruption of gas can meet the requirements of different working environments and equipment, greatly improving the applicability and convenience. Description of the Drawings

[0029] To more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 Schematic three-dimensional structure diagram of a mechanically locked pneumatic tool according to an embodiment of the present utility model;

[0031] Figure 2 Cross-sectional view of a mechanically locked pneumatic tool according to an embodiment of the present utility model (locking state);

[0032] Figure 3 Cross-sectional view of a mechanically locked pneumatic tool according to an embodiment of the present utility model (released state);

[0033] Figure 4 Cross-sectional view of a mechanically locked pneumatic tool according to another embodiment of the present utility model (released state);

[0034] Figure 5 Schematic three-dimensional structure diagram of a clamping rod in a mechanically locked pneumatic tool according to an embodiment of the present utility model;

[0035] Figure 6 Schematic three-dimensional structure diagram of a locking assembly in a mechanically locked pneumatic tool according to an embodiment of the present utility model;

[0036] Figure 7 Front view of a locking assembly in a mechanically locked pneumatic tool according to an embodiment of the present utility model (locking state);

[0037] Figure 8 Front view of a locking assembly in a mechanically locked pneumatic tool according to an embodiment of the present utility model (released state);

[0038] Figure 9 Cross-sectional view of an extrusion sleeve in a mechanically locked pneumatic tool according to an embodiment of the present utility model.

[0039] The above-mentioned reference numerals:

[0040] 10 - cylinder block; 11 - first chamber; 12 - second chamber; 13 - first air hole; 14 - second air hole; 15 - limiting plate; 151 - ventilation hole;

[0041] 20 - piston assembly; 21 - piston; 22 - clamping rod; 221 - first locking portion; 2211 - concave portion; 2212 - first locking inclined surface;

[0042] 30 - Locking component; 31 - Locking ring; 311 - Second locking part; 3111 - Locking space; 3112 - Second locking inclined plane; 312 - Locking piece; 313 - Connecting piece; 314 - First inclined plane

[0043] 40 - Extrusion component; 41 - Extrusion sleeve; 411 - Second inclined plane; 412 - Ring groove; 42 - Elastic part

[0044] 50 - Wear-resistant ring Detailed implementation mode

[0045] In order to enable those skilled in the art to better understand the technical solution of the present utility model, the present utility model will be described in detail below with reference to the accompanying drawings. The description of this part is only exemplary and explanatory, and should not have any restrictive effect on the protection scope of the present utility model.

[0046] It should be noted that similar reference numerals represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0047] It should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this utility model is usually placed when in use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying 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 construed as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0048] In addition, the terms "horizontal", "vertical", "hanging", etc. do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0049] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0050] Please refer to Figures 1 to 9As shown in the figure, the mechanical locking pneumatic tool includes a cylinder block 10 and a piston assembly 20, a locking assembly 30, and an extrusion assembly 40 disposed within the cylinder block 10.

[0051] The cylinder block 10 has a cavity inside and a structure with at least one open end. In this embodiment, for the convenience of disassembling and assembling the components inside the cylinder block 10, the cylinder block 10 may include a hollow cylinder barrel and a front cover and a rear cover respectively connected to the two open ends of the cylinder barrel. Both the front cover and the rear cover are hermetically connected to the cylinder barrel through sealing rings.

[0052] The piston assembly 20 may include a piston 21 and a clamping rod 22. The piston 21 is slidably disposed within the cavity, and the clamping rod 22 is used for clamping and fixing a workpiece. One end of the clamping rod 22 may be fixedly connected to the piston 21 through a fastener such as a screw, and the other end extends to the outside of the cylinder block 10.

[0053] The locking assembly 30 is disposed within the cavity of the cylinder block 10 and above the piston 21. The locking assembly 30 is sleeved outside the clamping rod 22, and the locking assembly 30 can deform radially to lock or release the piston assembly 20; wherein, the locking assembly 30 may be a locking ring made of an elastic material.

[0054] The extrusion assembly 40 includes an extrusion sleeve 41 and an elastic member 42. The extrusion sleeve 41 is sleeved outside the locking assembly 30 and can move axially along the cavity to extrude or release the locking assembly 30, causing the locking assembly 30 to elastically deform. The elastic member 42 is disposed between the top wall of the cylinder block 10 and one end of the extrusion sleeve 41 facing away from the locking assembly 30. Among them, the elastic member 42 includes, but is not limited to, a spring.

[0055] Specifically, during operation, gas is introduced into the bottom of the extrusion sleeve 41 to drive the extrusion sleeve 41 to slide in a direction away from the locking assembly 30, thereby releasing the extrusion force on the locking assembly 30, causing the locking assembly 30 to expand radially outward to release the piston assembly 20, enabling the piston assembly 20 to move freely along the axis of the cylinder block 10. At this time, the elastic member 42 is compressed and deformed.

[0056] When the gas at the bottom of the extrusion sleeve 41 is discharged, the elastic member 42 elastically returns and pushes the extrusion sleeve 41 to slide in a direction close to the locking assembly 30 to extrude the locking assembly 30, causing the locking assembly 30 to shrink radially inward to lock and fix the piston assembly 20.

[0057] Therefore, when the piston assembly 20 of the pneumatic tool with mechanical locking of the present application is in the working state, the elastic member 42 can drive the extrusion sleeve 41 to move towards the locking assembly 30 and extrude the locking assembly 30, causing the locking assembly 30 to shrink radially inward and press against the outer wall of the piston assembly 20 to lock and fix the piston assembly 20, thereby restricting the axial movement of the piston assembly 20. Since the locking between the piston assembly 20 and the locking assembly 30 is a mechanical locking method, after the locking action is completed, it is not necessary to supply compressed air to the bottom of the piston assembly 20 to lock and fix the piston assembly 20, enabling the piston assembly 20 to maintain a stable working posture. This not only saves energy, but also the holding force during the operation of the pneumatic tool is not affected by the fluctuation of the air pressure, and there will be no problem of gas compression displacement of the piston assembly 20 caused by the reverse extrusion force, effectively improving the axial holding force and stability during the operation of the pneumatic tool. Secondly, compared with the traditional method of increasing the cylinder diameter or setting multiple pistons to increase the piston area to enhance the holding force of the cylinder, the present utility model can achieve a strong holding force with a small-volume cylinder, which not only saves the manufacturing cost, but also the characteristic that the normal operation is not affected by the cut-off air can meet different working environments and equipment requirements, greatly improving the applicability and convenience.

[0058] In some embodiments of the present application, a first locking portion 221 is formed on the circumferential side of the clamping rod 22 located inside the cylinder block 10. Among them, the first locking portion 221 can be a wedge-shaped groove recessed in the circumferential side of the piston assembly 20. A second locking portion 311 is formed on the inner wall of the locking assembly 30 in contact with the piston assembly 20, and the second locking portion 311 can be a wedge-shaped portion adapted to the first locking portion 221.

[0059] When the extrusion assembly 40 extrudes the locking assembly 30, the locking assembly 30 becomes smaller radially inward, and the first locking portion 221 and the second locking portion 311 come into contact to lock the piston assembly 20.

[0060] When the extrusion assembly 40 releases the locking assembly 30, the locking assembly 30 becomes larger radially outward, and the first locking portion 221 and the second locking portion 311 are separated to release the piston assembly 20.

[0061] Specifically, when the piston assembly 20 is in the working state of clamping a workpiece, the elastic member 42 drives the extrusion sleeve 41 to slide downward and extrude the locking assembly 30, causing the locking assembly 30 to continuously shrink radially inward until the second locking portion 311 is completely in contact with the first locking portion 221. The locking assembly 30 is in a locked state, and the piston assembly 20 is restricted from moving axially downward, avoiding the problem of axial displacement of the piston assembly 20 when it is subjected to a reverse acting force, thereby enhancing the holding force and stability of the piston assembly 20 in the working state.

[0062] When it is necessary to release the workpiece, gas is introduced into the bottom of the extrusion sleeve 41 to push the extrusion sleeve 41 to slide in a direction away from the locking assembly 30, so as to release the extrusion force on the locking assembly 30, and make the locking assembly 30 continuously increase radially outwards until the second locking portion 311 is completely separated from the first locking portion 221, and the locking assembly 30 is in a released state. At this time, the piston assembly 20 can move axially downwards along the cylinder block 10 to release the workpiece.

[0063] Through the cooperation of the second locking portion 311 and the first locking portion 221, the piston assembly 20 can be quickly locked and fixed, and even when the locking assembly 30 is subjected to a reverse acting force, there will be no problem of axial displacement.

[0064] In some embodiments, the locking assembly 30 may include a locking ring 31 with variable size, and the second locking portion 311 is arranged inside the locking ring 31. When the locking assembly 30 is squeezed, the locking ring 31 can become smaller radially inwards, so that the second locking portion 311 contacts the first locking portion 221, thereby locking the piston assembly 20 and making the piston assembly 20 unable to move axially, thus improving the clamping stability of the piston assembly 20. When the locking assembly 30 is released, the locking ring 31 can become larger radially outwards, so that the second locking portion 311 is separated from the first locking portion 221, thereby releasing the piston assembly 20 and making the piston assembly 20 able to move freely axially.

[0065] Please refer to Figures 7 to 8 In some embodiments of the present application, the locking ring 31 may include at least two locking members 312. The locking members 312 may be arc-shaped blocks. At least two locking members 312 are connected end to end to enclose a closed locking ring 31. At least two locking members 312 can move relative to each other radially. When at least two locking members 312 move towards each other, the locking ring 31 becomes smaller radially inwards, and the second locking portion 311 contacts the first locking portion 221. When at least two locking members 312 move away from each other, the locking ring 31 becomes larger radially outwards, and the second locking portion 311 is separated from the first locking portion 221.

[0066] It should be noted that the at least two locking members 312 refer to the number of the locking members 312 being two or more. The at least two locking members 312 can be sleeved with each other or movably connected by a connecting shaft. In some embodiments of the present application, the at least two locking members 312 are connected by a connecting member 313. The connecting member 313 can be a spring connected between two adjacent locking members 312, or an O-ring or a wire spring ring that sleeves the outside of the locking ring 31 to connect the plurality of locking members 312. In this embodiment, the connecting member 313 is described as a wire spring ring. When the pressing assembly 40 releases the locking ring 31, the locking ring 31 is in a free state. At this time, driving the piston assembly 20 to move downward can exert a pressing effect on the inner wall of the locking ring 31, causing the plurality of locking members 312 to move away from each other and driving the connecting member 313 to undergo elastic deformation. The locking ring 31 then expands radially outward, and the second locking portion 311 is separated from the first locking portion 221. When the piston assembly 20 moves upward until the first locking portion 221 contacts the second locking portion 311, the connecting member 313 contracts inward under its own elastic action and drives the plurality of locking members 312 to move toward each other, causing the locking ring 31 to contract radially inward. At the same time, the pressing assembly 40 presses the outer wall of the locking ring 31 to limit the radial direction of the locking ring 31, thereby locking the piston assembly 20.

[0067] Please refer to Figures 4 to 7, in some embodiments of the present application, the first locking portion 221 may include a recess 2211, on which a first locking inclined surface 2212 is formed. The recess 2211 is arranged along the circumferential direction of the piston assembly 20 and is recessed from the outer peripheral side of the piston assembly 20. The axial height dimension of the recess 2211 along the piston assembly 20 may be greater than or equal to the axial height dimension of the locking assembly 30, which is convenient for the quick snap-fit of the locking assembly 30 and the recess 2211. The first locking inclined surface 2212 may be disposed on the top surface of the recess 2211 close to the extrusion assembly 40 and is inclined from top to bottom and inward. The second locking portion 311 may include a locking space 31111 with variable size, and a second locking inclined surface 3112 is formed on the inner wall of the locking space 31111. The second locking inclined surface 3112 may be disposed on the upper part of the inner wall of the locking space 31111 and is inclined from top to bottom and inward. The inclination of the second locking inclined surface 3112 matches that of the first locking inclined surface 2212. When the piston assembly 20 is in a locked state, the locking space 3111 is sleeved on the recess 2211, and the second locking inclined surface 3112 abuts against the first locking inclined surface 2212, thereby locking the piston assembly 20 to limit the axial movement of the piston assembly 20. Through the cooperation of the recess 2211 and the locking space 31111, the piston assembly 20 and the locking assembly 30 can be snap-connected, thereby improving the connection stability between the two; through the butt-joint of the two locking inclined surfaces, the contact area between the piston assembly 20 and the locking assembly 30 can be increased, which not only increases the locking force, but also as long as the first locking inclined surface 2212 on the piston assembly 20 contacts the second locking inclined surface 3112 on the locking assembly 30, the locking assembly 30 can be quickly snapped into the recess 2211 to realize the locking of the piston assembly 20.

[0068] Further, in some embodiments of the present application, such as Figure 6 and Figure 9As shown, a first inclined surface 314 is provided on the outer peripheral side of the locking assembly 30 and / or a second inclined surface 411 is provided on the inner wall of the extrusion sleeve 41. That is to say, the outer peripheral side of the locking assembly 30 can be set as the first inclined surface 314, and the inner wall of the extrusion sleeve 41 can be a vertical surface. The first inclined surface 314 is inclined downward and outward. When the extrusion sleeve 41 slides downward along the axis, its bottom end contacts the first inclined surface 314 and slides along the first inclined surface 314, thereby forcing the locking assembly 30 to elastically deform radially inward; similarly, the inner wall of the extrusion sleeve 41 can be set as the second inclined surface 411, and the outer peripheral side of the locking assembly 30 can be a vertical surface. The second inclined surface 411 is inclined downward and outward. When the extrusion sleeve 41 slides downward along the axis, the second inclined surface 411 contacts the outer peripheral side of the locking assembly 30. As the extrusion sleeve 41 continuously moves downward to squeeze the locking assembly 30, the locking assembly 30 is forced to elastically deform radially inward. Of course, the outer peripheral side of the locking assembly 30 can be set as the first inclined surface 314, and at the same time, the inner wall of the extrusion sleeve 41 is set as the second inclined surface 411. The first inclined surface 314 contacts the second inclined surface 411. The height dimension of the second inclined surface 411 can be greater than or equal to the height dimension of the first inclined surface 314, so that when the locking assembly 30 is in the squeezed and released states, the first inclined surface 314 and the second inclined surface 411 remain in contact, thereby limiting the radial direction of the locking assembly 30 and preventing the first inclined surface 314 and the second inclined surface 411 from separating during the deformation of the locking assembly 30.

[0069] In some embodiments of the present application, a ring groove 412 for accommodating the upper end of the locking assembly 30 can be provided at the bottom of the extrusion sleeve 41, and the shape of the ring groove 412 is adapted to the shape of the upper end of the locking assembly 30. Among them, the second inclined surface 41 is located at the lower end of the ring groove 412. When the extrusion sleeve 41 slides downward to squeeze the locking assembly 30, the upper end of the locking assembly 30 can slide along the second inclined surface 411 into the ring groove 412. At this time, the inner peripheral wall of the ring groove 412 can abut against the outer peripheral surface of the locking assembly 30, thereby restricting the locking assembly 30 radially and further improving the locking force.

[0070] Please continue to refer to Figure 2 and Figure 3 , the cavity of the cylinder block 10 can include a first chamber 11 and a second chamber 12 that are sequentially distributed and interconnected in the height direction. A first air hole body 13 communicating with the first chamber 11 and a second air hole body 14 communicating with the second chamber 12 are provided on the side wall of the cylinder block 10. Both the first air hole body 13 and the second air hole body 14 can be externally connected to a gas source. The locking assembly 30 and the extrusion assembly 40 are arranged in the first chamber 11. The piston 21 is arranged in the second chamber 12. One end of the clamping rod 22 is connected to the piston 21, and the other end extends outside the cylinder block 10 through the first chamber 11.

[0071] Please refer to Figure 2, when it is necessary to clamp and fix the workpiece, gas is introduced into the second chamber 12 through the second air hole 14. The air pressure in the second chamber 12 gradually increases and exerts a force on the bottom of the piston 21, pushing the piston 21 to move upward along the inner wall of the cylinder block 10. During the upward movement of the piston 21, the clamping rod 22 connected thereto is driven to move upward until the clamping rod 22 abuts against the workpiece, and the workpiece is clamped and fixed. The first locking inclined surface 2212 on the clamping rod 22 approaches and contacts the second locking inclined surface 3112 on the locking assembly 30. At the same time, the elastic member 42 elongates downward to reset and pushes the extrusion sleeve 41 to move downward. The inclined surface two 411 on the inner wall of the extrusion sleeve 41 extrudes the inclined surface one 314 on the outer peripheral side of the locking assembly 30, causing the locking assembly 30 to shrink inward in the radial direction until the first locking inclined surface 2212 and the second locking inclined surface 3112 are completely fitted. At this time, the outer cylindrical surface at the upper end of the locking assembly 30 is fitted with the inner cylindrical surface of the annular groove 412, and the axial movement of the clamping rod 22 is locked and restricted.

[0072] Please refer to Figure 3 , when it is necessary to release the workpiece, gas is introduced into the first chamber 11 through the first air hole 13. The air pressure in the first chamber 11 gradually increases and exerts a force on the bottom surface of the extrusion sleeve 41, pushing the extrusion sleeve 41 to move upward along the inner wall of the cylinder block 10, causing the elastic member 42 to be compressed and deformed. The extrusion sleeve 41 releases the extrusion force on the locking assembly 30. At the same time, the gas in the first chamber 11 flows downward along the gap on the side wall of the clamping rod 22 and enters the second chamber 12, and pushes the piston 21 to drive the clamping rod 22 to move downward. When the clamping rod 22 moves downward, the first locking inclined surface 2212 exerts an extrusion effect on the second locking inclined surface 3112 on the locking assembly 30, forcing the locking assembly 30 to become larger outward in the radial direction until the first locking inclined surface 2212 and the second locking inclined surface 3112 are completely separated, completing the unlocking. The piston 21 moves to the bottom of the second chamber 12, and the clamping rod 22 releases the workpiece.

[0073] Further, in some embodiments of the present application, please refer to Figure 4 , the first chamber 11 and the second chamber 12 can be separated by a limiting plate 15. The limiting plate 15 can be integrally formed with the cylinder block 10 or fixed on the inner wall of the cylinder block 10 through a snap ring or the like. The clamping rod 22 penetrates through the limiting plate 15, and the limiting plate 15 is provided with a ventilation hole 151 communicating the first chamber 11 and the second chamber 12. A plurality of ventilation holes 151 can be provided, and the plurality of ventilation holes 151 are circumferentially spaced apart on the limiting plate 15. By providing a plurality of ventilation holes 151, the inflation speed can be increased and the working efficiency can be improved.

[0074] In some embodiments of the present application, such as Figures 2 to 4As shown, a wear-resistant ring 50 can also be provided on the bottom surface of the first chamber 11, and the wear-resistant ring 50 contacts the bottom surface of the locking assembly 30. By providing the wear-resistant ring 50, it is possible to prevent the bottom surface of the first chamber 11 from being worn when the locking assembly 30 is deformed during radial movement.

[0075] It should be noted that in this text, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device.

[0076] In this article, specific examples are used to elaborate on the principle and implementation mode of the present invention. The description of the above examples is only used to help understand the method and its core idea of the present invention. The above is only the preferred implementation mode of the present invention. It should be pointed out that due to the limited nature of written expression and the objectively infinite specific structures, for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements, retouches or changes can be made, or the above technical features can be combined in an appropriate manner; these improvements, retouches, changes or combinations, or the direct application of the concept and technical solution of the present invention to other occasions without improvement, should all be regarded as the protection scope of the present invention.

Claims

1. A mechanically locked pneumatic tool, characterized in that, Comprising: A cylinder block (10) having a cavity therein; A piston assembly (20) including a piston (21) and a clamping rod (22), the piston (21) being slidably disposed within the cavity, one end of the clamping rod (22) being connected to the piston (21) and the other end extending outside the cylinder block (10); A locking assembly (30) disposed within the cavity and above the piston (21), the locking assembly (30) being sleeved outside the clamping rod (22), the locking assembly (30) being capable of deforming radially to lock or release the piston assembly (20); An extrusion assembly (40) including an extrusion sleeve (41) and an elastic member (42), the extrusion sleeve (41) being sleeved outside the locking assembly (30) and capable of axially moving along the cavity to extrude or release the locking assembly (30) such that the locking assembly (30) undergoes elastic deformation, the elastic member (42) being disposed between the top wall of the cylinder block (10) and one end of the extrusion sleeve (41) facing away from the locking assembly (30).

2. The mechanical locking pneumatic tool according to claim 1, characterized in that, A first locking portion (221) is provided on the clamping rod (22), and a second locking portion (311) cooperating with the first locking portion (221) is provided on the locking assembly (30); When the extrusion assembly (40) extrudes the locking assembly (30), the locking assembly (30) becomes smaller radially inwards, and the first locking portion (221) and the second locking portion (311) come into contact to lock the piston assembly (20); When the extrusion assembly (40) releases the locking assembly (30), the locking assembly (30) becomes larger radially outwards, and the first locking portion (221) and the second locking portion (311) separate to release the piston assembly (20).

3. The mechanical locking pneumatic tool according to claim 2, wherein, The locking assembly (30) includes a locking ring (31) with variable size, and the second locking portion (311) is provided within the locking ring (31); When the locking assembly (30) is extruded, the locking ring (31) shrinks radially inwards, and the second locking portion (311) comes into contact with the first locking portion (221); When the locking assembly (30) is released, the locking ring (31) becomes larger radially outwards, and the second locking portion (311) separates from the first locking portion (221).

4. The mechanical locking pneumatic tool according to claim 3, wherein, The locking ring (31) includes at least two locking members (312), the at least two locking members (312) being connected by a connecting member (313) to form the locking ring (31), and the at least two locking members (312) being capable of approaching or separating from each other to adjust the size of the locking ring (31).

5. The mechanical locking pneumatic tool according to any one of claims 2 to 4, characterized in that, The first locking portion (221) includes a recess (2211) recessed in the outer peripheral side of the clamping rod (22), and a first locking inclined surface (2212) is formed on the recess (2211); The second locking portion (311) includes a locking space (3111) with variable size, a second locking inclined surface (3112) is formed on the inner wall of the locking space (3111), and the clamping rod (22) passes through the locking space (3111); When the piston assembly (20) is in the locked state, the locking space (3111) is hoop-shaped around the recess (2211), and the second locking inclined surface (3112) abuts against the first locking inclined surface (2212).

6. The mechanical locking pneumatic tool according to any one of claims 1 to 4, characterized in that A first inclined surface (314) is provided on the outer peripheral side of the locking assembly (30) and / or a second inclined surface (411) is provided on the inner wall of the extrusion sleeve (41). The first inclined surface (314) and / or the second inclined surface (411) can cause the locking assembly (30) to deform radially inward when the extrusion sleeve (41) presses on it.

7. The mechanical locking pneumatic tool according to any one of claims 1 to 4, characterized in that, The cavity includes a first chamber (11) and a second chamber (12) that are sequentially distributed in the height direction and communicate with each other. A first air hole (13) communicating with the first chamber (11) and a second air hole (14) communicating with the second chamber (12) are provided on the side wall of the cylinder block (10). The locking assembly (30) and the extrusion assembly (40) are arranged in the first chamber (11). The piston (21) is arranged in the second chamber (12). One end of the clamping rod (22) is connected to the piston (21), and the other end passes through the first chamber (11) and extends to the outside of the cylinder block (10).

8. The mechanical locking pneumatic tool according to claim 7, characterized in that, A limiting plate (15) is provided between the first chamber (11) and the second chamber (12). The clamping rod (22) penetrates through the limiting plate (15), and a ventilation hole (151) communicating with the first chamber (11) and the second chamber (12) is provided on the limiting plate (15).

9. The mechanical locking pneumatic tool according to claim 7, characterized in that, A wear-resistant ring (50) is provided on the bottom surface of the first chamber (11) in contact with the locking assembly (30).

10. The mechanical locking pneumatic tool according to claim 6, characterized in that, A ring groove (412) adapted to the upper end of the locking assembly (30) is provided at the bottom of the extrusion sleeve (41). When the extrusion assembly (40) presses on the locking assembly (30), the upper end of the locking assembly (30) is placed in the ring groove (412).

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