Impact tool

Abstract

The invention discloses an impact tool, belongs to the technical field of electric tools, solves the problem that an output shaft and a cylinder are prone to slipping after an air bag is broken, and adopts the technical scheme that the impact tool mainly comprises a machine shell, a driving mechanism, an impact mechanism and the output shaft are arranged in the machine shell, and the impact mechanism comprises the cylinder; one end of the output shaft extends into the cylinder and is in transmission connection with the cylinder, a sealed cavity is formed in the cylinder, a buffer bag is positioned in the sealed cavity, the sealed cavity is filled with liquid, a protruding part is arranged on the inner wall of the cylinder, and the output shaft is provided with a reset piece and a pulse blade. The protruding part pushes the pulse blade to move towards the output shaft so as to squeeze liquid, the buffering bag comprises a plurality of elastic air bags, each elastic air bag is internally provided with an independent and sealed containing cavity, and the containing cavities are filled with gas. The impact tool is mainly used for reducing the influence caused by breakage of the elastic air bag, and the service life of the impact tool can be prolonged.

Description

Technical Field

[0001] The invention discloses an impact tool, belonging to the technical field of electric tools. Background Art

[0002] The impact tool is a relatively convenient electric tool. The impact tool can store energy in a rotating mass body and then transfer the energy to the output shaft so that the output shaft transmits the rotational impact to the workpiece at a high speed, so that the workpiece can be subjected to a stronger rotational force.

[0003] For example, patent CN209954561U discloses an impact power tool and a rotary power tool, including an electric motor, a cylinder and an output shaft, wherein a driving mechanism is connected to the output shaft through a cylinder, a foldable capsule and a liquid are arranged in the cylinder, a protrusion is arranged on the inner wall of the cylinder, and a pulse blade is arranged on the outer peripheral side of the output shaft, when the load on the output shaft is small, the protrusion and the pulse blade are abutted against each other, so that the output shaft rotates with the cylinder; when the load on the output shaft is large, the output shaft cannot rotate, and the protrusion of the cylinder will push the pulse blade toward the output shaft, so that the cylinder and the output shaft rotate relative to each other, and during the relative rotation process, the camshaft in the cylinder will push the pulse blade away from the output shaft again, so that the protrusion and the pulse blade can rotate again. When the protrusion hits the pulse blade again, the rotational impact force of the cylinder will be transmitted to the output shaft, and the output shaft will transmit the rotational impact force to the workpiece, making the workpiece more firmly fixed or loosening the stuck workpiece; and when the protrusion pushes the pulse blade to move toward the output shaft, the pulse blade will squeeze the liquid inside the output shaft out of the output shaft, and the liquid in the output shaft will form resistance to the pulse blade, thereby delaying the pulse blade from separating from the protrusion, so that the cylinder can continue to output torque to the output shaft; as the impact tool runs, the temperature of the liquid in the cylinder will continue to rise, thereby increasing the volume of the liquid, and the foldable capsule will be squeezed and contracted by the liquid, thereby compensating for the thermal expansion of the liquid and avoiding excessive liquid pressure in the cylinder.

[0004] However, only one foldable bag is provided in the above-mentioned impact tool. When the foldable bag ruptures, the gas in the foldable bag will leak out, and the volume occupied by the foldable bag will become smaller, while the amount of liquid in the cylinder remains unchanged. Therefore, the hydraulic pressure in the cylinder will become smaller, causing the pulse blade to be more easily compressed back to the output shaft, making it easy for the output shaft and the cylinder to slip, so that the impact tool cannot be used normally. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the output shaft and the cylinder are prone to slipping after the airbag ruptures. For this purpose, an impact tool is provided, in which multiple independent elastic airbags are arranged in the cylinder to reduce the impact caused by the rupture of the elastic airbag and help to extend the service life of the impact tool.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions:

[0007] An impact tool comprises a casing, wherein a driving mechanism, an impact mechanism and an output shaft are arranged in the casing, wherein the driving mechanism is transmission-connected to the output shaft through the impact mechanism, wherein the impact mechanism comprises a cylinder, wherein one end of the output shaft extends into the cylinder and is transmission-connected to the cylinder, wherein a sealed cavity is formed in the cylinder, a buffer bag is positioned in the sealed cavity, and the sealed cavity is filled with liquid, wherein a protrusion is arranged on the inner wall of the cylinder, and wherein a reset member and a pulse blade movable in a radial direction are arranged on the output shaft, wherein the protrusion abuts against the pulse blade to drive the output shaft to rotate, and when the movement of the output shaft is obstructed, the protrusion pushes the pulse blade to move toward the output shaft to squeeze the liquid, wherein the buffer bag comprises a plurality of elastic air bags, wherein an independent and sealed accommodating cavity is arranged inside each elastic air bag, and the accommodating cavity is filled with gas.

[0008] The beneficial effects of adopting the present invention are:

[0009] The sealed cavity described in the present invention is provided with a plurality of elastic airbags, each of which has an independent and sealed accommodating cavity, and is filled with gas. When one of the elastic airbags ruptures, only the gas in the ruptured elastic airbag leaks, and the other elastic airbags can still remain intact. Therefore, the volume of the entire buffer bag is reduced less, and the hydraulic pressure in the corresponding sealed cavity is reduced less. The liquid can still form a large resistance to the pulse blade, especially when the load on the output shaft is large. The sealed cavity can maintain a large hydraulic pressure, so that the protrusion is not easy to push the pulse blade back to the output shaft, thereby delaying the pulse blade from detaching from the protrusion, so that the drive motor can continue to output torque to the output shaft. When the load on the output shaft is small When the impact tool is in normal operation, the possibility of slipping between the cylinder and the output shaft is reduced, and the use of the impact tool is more stable and reliable; in addition, the more elastic airbags there are, the smaller the overall volume of the buffer bag will be when each elastic airbag is ruptured, that is, the smaller the hydraulic pressure in the sealed cavity will drop, which can extend the service life of the impact tool to a greater extent; secondly, the buffer bag includes multiple elastic airbags. When the elastic airbag is ruptured, only one or several of them can be replaced, and there is no need to replace the entire buffer bag, which makes the maintenance of the impact tool simpler and more convenient, and can also reduce the maintenance cost of the impact tool.

[0010] Preferably, the elastic airbags are distributed on the outer peripheral side of the output shaft along the circumference of the output shaft.

[0011] Preferably, the buffer bag further includes a connecting plate, which surrounds the outer peripheral side of the output shaft, and a plurality of elastic air bags are fixed to the outer peripheral side of the output shaft through the connecting plate. With the above technical solution, the connecting plate can provide a stable support for the elastic air bag, and can make the elastic air bag more evenly distributed in the sealed cavity, thereby making the pressure distribution of the sealed cavity more even; in addition, all the elastic air bags are connected by the connecting plate, so that the buffer air bag is a whole, thereby reducing the difficulty of installing the buffer air bag, which helps to improve the assembly efficiency of the buffer air bag.

[0012] Preferably, the connecting plate includes a first end and a second end, and the connecting plate surrounds the output shaft so that the first end and the second end are close to each other, and there is a gap between the first end and the second end. With the above-mentioned technical solution, the first end and the second end of the connecting plate are not completely connected, and a gap is formed, so that when the connecting plate is subjected to extrusion force, there is a certain deformation space, which reduces the possibility of the connecting plate breaking; in addition, there is a gap between the first end and the second end, and when installing the buffer capsule, the output shaft can enter the inner side of the connecting plate through the gap to realize the connection plate surrounding the output shaft circumferentially, without the need to be installed from the end of the output shaft, thereby reducing the difficulty of assembling the buffer capsule and the output shaft, which helps to improve the assembly efficiency of the buffer capsule.

[0013] Preferably, the connecting plate is provided with a plurality of mounting holes, the elastic airbag is fixed in the mounting holes, and the middle of the elastic airbag is connected to the inner wall of the mounting hole. By adopting the above technical solution, the elastic airbag can be symmetrically distributed on both sides of the connecting plate, so that the force of the entire buffer airbag is more uniform.

[0014] Preferably, the connecting plate and the elastic airbag are an integrated structure. The above technical solution can improve the connection strength between the connecting plate and the elastic airbag, reduce the possibility of the elastic airbag detaching from the connecting plate, make the overall structure of the buffer bag more stable and reliable, and also help to extend the service life of the buffer bag; in addition, the integrated structure can simplify the manufacturing process of the buffer bag, which helps to reduce the manufacturing cost and manufacturing time of the buffer bag.

[0015] Preferably, the elastic airbag is in the shape of a sphere, an ellipsoid or a regular polyhedron. With the above technical solution, the shape of a sphere, an ellipsoid or a regular polyhedron enables the elastic airbag to absorb and disperse energy more effectively when impacted; in addition, these shapes are symmetrical, which can ensure that the extrusion force on the elastic airbag can be evenly distributed, thereby avoiding the phenomenon of local overload of the elastic airbag.

[0016] Preferably, the cylinder includes a sealed cylinder body and end cover and a partition inside the cylinder body, the cylinder body is transmission-connected to the driving mechanism, the end cover and the partition are both mounted on the outer peripheral side of the output shaft, and a step surface for positioning the partition is provided on the outer wall of the output shaft and / or the inner wall of the cylinder body, and a plurality of through holes are provided on the step surface to keep the two sides of the partition connected.

[0017] Preferably, the elastic airbag is positioned between the partition and the end cover, and the pulse blade is limited between the partition and the cylinder. With the above technical solution, the partition and the end cover can limit the elastic airbag, preventing the elastic airbag from running around with the liquid, making the positioning of the elastic airbag more stable and reliable; in addition, the partition can separate the elastic airbag and the pulse blade, avoiding mutual collision between the elastic airbag and the pulse blade, making the operation of the elastic airbag and the pulse blade more stable.

[0018] Preferably, the reset member includes a camshaft and a ball, the camshaft is fixed to the cylinder and rotates synchronously with the cylinder, a slot for the camshaft to extend into is provided at the end of the output shaft close to the driving mechanism, a sliding hole connected to the slot is provided on the outer surface of the output shaft, the ball is installed in the sliding hole and slides along the sliding hole, and the camshaft acts on the ball to push the pulse blade away from the output shaft.

[0019] Other features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings:

[0021] Figure 1 It is a structural schematic diagram of an impact tool of the present invention;

[0022] Figure 2 A cross-sectional view of an impact tool of the present invention;

[0023] Figure 3 An exploded view of an impact mechanism and an output shaft in an impact tool of the present invention;

[0024] Figure 4 It is an exploded view of the impact mechanism and the output shaft in the second embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the buffer capsule in the second embodiment of the present invention;

[0026] Figure 6 It is a cross-sectional view of the buffer bag in the second embodiment of the present invention.

[0027] Figure numerals: 1. housing; 2. driving motor; 21. motor shaft; 3. cylinder; 31. cylinder body; 32. end cover; 33. partition; 331. through hole; 34. buffer bag; 341. elastic air bag; 3411. accommodating chamber; 342. connecting plate; 343. gap; 35. sealing cavity; 36. first sealing ring; 37. second sealing ring; 4. output shaft; 41. camshaft; 42. pulse blade; 43. ball. DETAILED DESCRIPTION

[0028] The technical solutions of the embodiments of the present invention are explained and described below in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships 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, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly defined.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Embodiment 1:

[0033] like Figures 1 to 3As shown, this embodiment shows an impact tool, including a casing 1, in which a driving mechanism, an impact mechanism and an output shaft 4 are arranged, wherein the driving mechanism includes a driving motor 2, and the impact mechanism includes a cylinder 3. The motor shaft 21 of the driving motor 2 is transmission-connected with the cylinder 3, so that the driving motor 2 controls the cylinder 3 to rotate synchronously with the motor shaft 21, and a shaft hole for the output shaft 4 to extend into is arranged on the side of the cylinder 3 away from the driving motor 2, and a first sealing ring 36 is arranged on the inner wall of the shaft hole, and the output shaft 4 extends into the cylinder 3 and keeps in contact with the first sealing ring 36, so that a sealed cavity 35 is formed in the cylinder 3, and the sealed cavity 35 of the cylinder 3 is filled with liquid and a buffer capsule 34 is positioned, and a reset part and a pulse blade 42 movable in the radial direction are arranged on the part of the output shaft 4 in the sealed cavity 35, and a protrusion is arranged on the inner wall of the cylinder 3, and when the output shaft 4 has no load or a small load, the driving motor 2 drives the cylinder 3 to rotate, and after the cylinder 3 rotates until the protrusion abuts against the pulse blade 42, the cylinder 3 is abutted against the pulse blade 42 by the protrusion. The combination drives the output shaft 4 to rotate synchronously, thereby realizing the rotation of the output shaft 4, so that the output shaft 4 can install and disassemble the workpiece; when the load on the output shaft 4 is too large, the output shaft 4 cannot rotate, and the protrusion of the cylinder 3 will push the pulse blade 42 to move toward the output shaft 4, so that the cylinder 3 and the output shaft 4 produce relative rotation. During the relative rotation, the reset member will push the pulse blade 42 away from the output shaft 4 again, so that the protrusion and the pulse blade 42 will be against each other again. When the protrusion is against the pulse blade 42 again, the rotational impact force of the cylinder 3 will be transmitted to the output shaft 4, and the output shaft 4 will transmit the rotational impact force to the workpiece, making the fixation of the workpiece more secure or loosening the stuck workpiece; and when the protrusion pushes the pulse blade 42 to move toward the output shaft, the pulse blade 42 will squeeze the liquid inside the output shaft 4 out of the output shaft 4, and the liquid in the output shaft 4 will form resistance to the pulse blade, thereby delaying the pulse blade 42 from separating from the protrusion, so that the cylinder 3 can continuously output torque to the output shaft 4.

[0034] like Figure 2 and 3As shown, the buffer bag 34 in this embodiment includes a plurality of elastic air bags 341, and the elastic air bags 341 are made of elastic materials such as silicone or rubber, so that the elastic air bags 341 have good deformation performance. Each elastic air bag 341 is provided with an independent and sealed accommodating cavity 3411 inside, and the accommodating cavity 3411 is filled with gas. A plurality of elastic air bags 341 are provided in the sealed cavity 35, and each elastic air bag 341 has an independent and sealed accommodating cavity 3411, and the accommodating cavity 3411 is filled with gas. The elastic air bag 341 is positioned in the sealed cavity 35, and the sealed cavity 35 is filled with liquid. After the impact tool is started, as the cylinder 3 and the output shaft 4 continue to rotate, the temperature of the liquid in the sealed cavity 35 will increase, resulting in an increase in the volume of the liquid. The liquid will squeeze the elastic airbag 341, causing the elastic airbag 341 to be compressed, thereby compensating for the thermal expansion of the liquid and avoiding excessive liquid pressure in the cylinder 3. When one of the elastic airbags 341 ruptures, only the gas in the ruptured elastic airbag 341 leaks, and the other elastic airbags 341 can still remain intact. Therefore, the volume of the entire buffer bag 34 is reduced to a small extent, and the corresponding hydraulic pressure in the sealed cavity 35 is reduced. When the load on the output shaft 4 is small, the liquid can still form a large resistance to the pulse blade 42, especially when the load on the output shaft 4 is large, a large hydraulic pressure can be maintained in the sealing cavity 35, so that the protrusion is not easy to push the pulse blade 42 back to the output shaft 4, thereby delaying the pulse blade 42 from separating from the protrusion, so that the drive motor 2 can continue to output torque to the output shaft 4. When the load on the output shaft 4 is small, the pulse blade 42 can keep against the protrusion, so that the cylinder 3 and the output shaft 4 can keep rotating synchronously, so as to reduce the possibility of slipping of the cylinder 3 and the output shaft 4 under normal operation of the impact tool. , making the use of the impact tool more stable and reliable; in addition, the more the elastic airbags 341 are, the smaller the overall volume of the buffer bag 34 will be when each elastic airbag 341 is ruptured, that is, the hydraulic pressure in the sealed cavity 35 will drop less, thereby extending the service life of the impact tool to a greater extent; secondly, the buffer bag 34 includes a plurality of elastic airbags 341. When the elastic airbag 341 is ruptured, only one or several of them can be replaced, and there is no need to replace the entire buffer bag 34, thereby making the maintenance of the impact tool simpler and more convenient, and also reducing the maintenance cost of the impact tool.

[0035] like Figure 2 and Figure 3As shown, the reset member in this embodiment includes a camshaft 41 and a ball 43. The camshaft 41 is fixed to the cylinder 3 and rotates synchronously with the cylinder 3. The end of the output shaft 4 close to the driving mechanism is provided with a slot for the camshaft 41 to extend into. The outer surface of the output shaft 4 is provided with a sliding hole connected to the slot. The ball 43 is installed in the sliding hole and slides along the sliding hole. The outer surface of the camshaft 41 has a convex block. When the camshaft 41 rotates with the cylinder 3 until the convex block is aligned with the sliding hole, the convex block contacts the ball 43. At this time, the convex block acts on the ball 43 to push the pulse blade 42 away from the output shaft 4. When the convex block is staggered from the sliding hole, the ball 43 loses the force of the protrusion, and the pulse blade 42 can move toward the output shaft 4. In addition, in order to ensure that the cylinder 3 and the output shaft 4 can maintain stable transmission, in this embodiment, when the protrusion of the camshaft 41 contacts the ball 43, the protrusion of the cylinder 3 abuts against the pulse blade 42, and then when the load on the output shaft 4 is small, the pulse blade 42 abuts against the protrusion, limiting the relative rotation of the cylinder 3 and the output shaft 4, and the camshaft contacts the ball 43 to limit the separation of the pulse blade 42 from the protrusion, thereby maintaining the synchronous rotation of the cylinder 3 and the output shaft 4, so that the output shaft 4 can install and disassemble the workpiece.

[0036] If the load on the output shaft 4 is too large, the driving motor 2 cannot drive the output shaft 4 to rotate through the cylinder 3, and the cylinder 3 will rotate relative to the output shaft 4. The convex block of the camshaft 41 will gradually stagger the sliding hole, and the force of the camshaft 41 on the ball 43 will decrease. At this time, the protrusion will push the pulse blade 42 to move toward the output shaft 4. Since the sealing cavity 35 is full of liquid, that is, the slot of the output shaft 4 is also full of liquid, during the movement of the pulse blade 42 toward the output shaft 4, part of the liquid in the slot will be squeezed out of the slot, and the hydraulic pressure in the slot will be increased in the process. , and thus the speed at which the pulse blade 42 moves toward the output shaft 4 can be slowed down until the protrusion is separated from the pulse blade 42, and the cylinder 3 can rotate relative to the output shaft 4; during the relative rotation of the cylinder 3 and the output shaft 4, the camshaft 41 rotates with the cylinder 3, and acts on the pulse blade 42 through the ball 43, so that the pulse blade 42 moves away from the output shaft 4 again, so that the protrusion and the pulse blade 42 can be abutted against each other again. When the protrusion abuts against the pulse blade 42 again, the rotational impact force of the cylinder 3 will be transmitted to the output shaft 4, so that the output shaft 4 has a larger torque.

[0037] like Figure 2As shown, the cylinder 3 in this embodiment includes a cylinder body 31 and an end cover 32, wherein the cylinder body 31 is drivingly connected to the motor shaft 21 of the drive motor 2, the end of the cylinder body 31 away from the drive motor 2 is open, the end cover 32 is threadedly connected to the cylinder body 31 to close the opening of the cylinder body 31, and the shaft hole is arranged in the middle of the end cover 32 for the output shaft 4 to extend into the sealing cavity 35. In order to improve the sealing performance of the cylinder body 31 and the end cover 32, a second sealing ring 37 is arranged on the outer peripheral side of the end cover 32. When the cylinder body 31 and the end cover 32 are tightened, the second sealing ring 37 is squeezed between the outer wall of the end cover 32 and the inner wall of the cylinder body 31, so that the connection between the cylinder body 31 and the end cover 32 maintains a sealing fit.

[0038] like Figure 2 and Figure 3 As shown, in this embodiment, a partition 33 is provided in the cylinder 3, and a positioning groove is provided on the outer circumference of the output shaft 4. The partition 33 is mounted on the output shaft 4 and embedded in the positioning groove. The side wall of the positioning groove forms a step surface and positions the partition 33 to limit the partition 33 from moving along the axial direction of the output shaft 4. The partition 33 is provided with a plurality of through holes 331, which are distributed along the circumference of the partition 33 at the edge of the partition 33. The through holes 331 can keep the areas on both sides of the partition 33 connected, and the elastic airbag 34 The elastic airbag 341 is positioned between the partition 33 and the end cover 32, and the pulse blade 42 is limited between the partition 33 and the cylinder 31. The partition 33 and the end cover 32 can limit the elastic airbag 341 to prevent the elastic airbag 341 from running around with the liquid, making the positioning of the elastic airbag 341 more stable and reliable; in addition, the partition 33 can separate the elastic airbag 341 and the pulse blade 42 to prevent the elastic airbag 341 and the pulse blade 42 from colliding with each other, making the operation of the elastic airbag 341 and the pulse blade 42 more stable.

[0039] Of course, it is understandable that in other embodiments, the step surface may also be provided on the inner wall of the cylinder 31 ; or, the step surface may be provided on both the inner wall of the cylinder 31 and the output shaft 4 .

[0040] In order to prevent the elastic airbag 341 from making direct contact with the output shaft 4, a baffle extending toward the inside of the cylinder 3 is provided at the edge of the shaft hole of the end cover 32 in this embodiment, and the end of the baffle is against the partition 33. The partition 33 and the end cover 32 cooperate to form an annular cavity. The elastic airbag 341 is distributed in the annular cavity. The partition 33 can separate the elastic airbag 341 from the output shaft 4, thereby preventing the elastic airbag 341 from making direct contact with the output shaft 4. Since the output shaft 4 will rotate during operation, when the elastic airbag 341 comes into contact with the output shaft 4 When the elastic airbag 341 is in contact with the output shaft 4, the output shaft 4 will impact the elastic airbag 341, causing the elastic airbag 341 to move in the sealed cavity 35, which may affect the movement of the pulse blade 42.

[0041] like Figure 3 As shown, the elastic airbag 341 in this embodiment is spherical as a whole, and each elastic airbag 341 is independently provided. The spherical shape enables the elastic airbag 341 to absorb and disperse energy more effectively when impacted; in addition, the spherical shape is symmetrical, which can ensure that the extrusion force on the elastic airbag 341 can be evenly distributed, thereby avoiding the phenomenon of local overload of the elastic airbag 341. Of course, it can be understood that in other embodiments, the elastic airbag 341 can also be an ellipsoid or a regular polyhedron.

[0042] Embodiment 2:

[0043] like Figures 4 to 6 As shown, the main difference between this embodiment and the first embodiment is that the buffer bag 34 in this embodiment also includes a connecting plate 342, which surrounds the outer peripheral side of the output shaft 4, and multiple elastic air bags 341 are fixed to the outer peripheral side of the output shaft 4 through the connecting plate 342. The connecting plate 342 can provide a stable support for the elastic air bags 341, and can make the elastic air bags 341 more evenly distributed in the sealed cavity 35, thereby making the pressure distribution of the sealed cavity 35 more uniform; in addition, all the elastic air bags 341 are connected by the connecting plate 342, so that the buffer air bags are a whole, which can reduce the difficulty of installing the buffer air bags and help improve the assembly efficiency of the buffer air bags.

[0044] In addition, the connecting plate 342 described in the present embodiment includes a first end and a second end, and the connecting plate 342 surrounds the output shaft 4 so that the first end and the second end are close to each other, and there is a gap 343 between the first end and the second end. The connecting plate 342 and the elastic airbag 341 are both made of elastic materials, and the connecting plate 342 and the elastic airbag 341 are an integrated structure. The first end and the second end of the connecting plate 342 are not completely connected, and a gap 343 is formed, so that the connecting plate 342 can have a certain deformation space when subjected to extrusion force, thereby reducing the possibility of the connecting plate 342 breaking; in addition, there is a gap 343 between the first end and the second end. When installing the buffer capsule 34, the output shaft 4 can enter the inner side of the connecting plate 342 through the gap 343, so that the connecting plate 342 can surround the output shaft 4 circumferentially, without the need to be installed from the end of the output shaft 4, thereby reducing the difficulty of assembling the buffer capsule 34 and the output shaft 4, which helps to improve the assembly efficiency of the buffer capsule 34.

[0045] Of course, it is understandable that in other embodiments, the connecting plate 342 may also be provided with a plurality of mounting holes, and the elastic airbag 341 is fixed in the mounting hole, and the middle part of the elastic airbag 341 is connected to the inner wall of the mounting hole, so that the elastic airbag 341 can be symmetrically distributed on both sides of the connecting plate 342, so that the force on the entire buffer airbag is more uniform.

[0046] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. An impact tool, comprising a housing, a driving mechanism, an impact mechanism and an output shaft are arranged in the housing, the driving mechanism is connected to the output shaft through the impact mechanism, the impact mechanism comprises a cylinder, one end of the output shaft extends into the cylinder and is connected to the cylinder, the other end passes through the housing and extends out of the housing, a sealed cavity is formed in the cylinder, a buffer capsule is positioned in the sealed cavity, and the sealed cavity is filled with liquid, a protrusion is arranged on the inner wall of the cylinder, a reset member and a pulse blade movable in a radial direction are arranged on the output shaft, the protrusion abuts against the pulse blade to drive the output shaft to rotate, when the output shaft is blocked, the protrusion pushes the pulse blade to move toward the output shaft to squeeze the liquid, characterized in that The buffer bag includes a plurality of elastic air bags, each of which has an independent and sealed accommodating cavity filled with gas.

2. An impact tool according to claim 1, characterized in that: The elastic airbags are distributed on the outer peripheral side of the output shaft along the circumferential direction of the output shaft.

3. An impact tool according to claim 1, characterized in that: The buffer bag also includes a connecting plate, which surrounds the outer peripheral side of the output shaft, and a plurality of elastic air bags are fixed to the outer peripheral side of the output shaft through the connecting plate.

4. An impact tool according to claim 3, characterized in that: The connecting plate includes a first end and a second end. The connecting plate surrounds the output shaft so that the first end and the second end are close to each other, and a gap is formed between the first end and the second end.

5. An impact tool according to claim 3, characterized in that: The connecting plate is provided with a plurality of mounting holes, the elastic airbag is fixed in the mounting holes, and the middle part of the elastic airbag is connected to the inner wall of the mounting hole.

6. An impact tool according to claim 3, characterized in that: The connecting plate and the elastic airbag are an integrated structure.

7. An impact tool according to claim 1, characterized in that: The elastic airbag is in the shape of a sphere, an ellipsoid or a regular polyhedron.

8. An impact tool according to claim 1, characterized in that: The cylinder includes a sealed cylinder body and an end cover and a partition inside the cylinder body. The cylinder body is transmission-connected to the driving mechanism. The end cover and the partition are both mounted on the outer circumference of the output shaft. A step surface for positioning the partition is provided on the outer wall of the output shaft and / or the inner wall of the cylinder body. A plurality of through holes are provided on the step surface to keep the two sides of the partition connected.

9. An impact tool according to claim 8, characterized in that: The elastic airbag is positioned between the partition and the end cover, and the pulse blade is limited between the partition and the cylinder.

10. The impact tool according to claim 1, characterized in that: The reset member includes a camshaft and a ball. The camshaft is fixed to the cylinder and rotates synchronously with the cylinder. A slot for the camshaft to extend into is provided at the end of the output shaft close to the driving mechanism. A sliding hole connected to the slot is provided on the outer surface of the output shaft. The ball is installed in the sliding hole and slides along the sliding hole. The camshaft acts on the ball to push the pulse blade away from the output shaft.

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