TWM511927U - Pneumatic ratchet wrench - Google Patents

Description

Pneumatic ratchet wrench (2)

This creation is about a pneumatic tool, especially a pneumatic ratchet wrench (2) with a large contact area and a uniform force.

The pneumatic ratchet wrench is a commonly used tool in the general machinery industry. It is used on the detachable screwing element. By driving a screwing element through a drive shaft, a pneumatic motor can quickly loosen the function of the screwing component.

For example, in the invention patent of the Patent Publication No. I455798, a pneumatic driving tool having an impact type impact group is disclosed, the pneumatic driving tool comprising a handle, a casing, an impact group and a ratchet unit, the handle A driving motor is disposed at one end of the housing, and the housing is provided with one end of the driving motor, and a rotating space is formed inside the housing, and the impact group is correspondingly disposed in the rotating space. The impact group includes a rotating sleeve, a rotating base rotatably disposed in the rotating sleeve, a striking disc stuck to the rotating base, and an anvil shaft interposed on the rotating base. a ratchet unit is disposed on the housing and coupled to the anvil shaft; thereby, when the driving motor drives the rotating base to rotate, the rotating sleeve and the striking disc are driven to reciprocate through the rotating base, and The rotation of the anvil shaft is driven to drive the ratchet unit to achieve the purpose of outputting power.

The aforementioned patent uses the setting of the impact group to achieve the proper transmission function, but the configuration of the structure makes the following problems still occur in practical use:

1. The impact group uses a single hitting plate to strike the anvil axis, although it is reachable. To the expected impact, but because of the small contact area when hitting the drill shaft with a single hitch, the force between the two is not easy to average, which not only exacerbates the impact generated by the tap. The vibration force affects the smoothness of the transmission action, and is easy to cause wear and damage between the components, and the torque loss outputted by the ratchet wrench is increased, which also reduces the service life of the impact group.

2. The component of the impact group whose driving torque is the anvil axis, and the two ends of the anvil shaft respectively use an anvil and an eccentric shaft to generate and impart a torque, based on the anvil and the eccentric shaft. The structure is a structure in which the outer diameter is reduced in a straight rod shape and protruded on both sides. The short rod-like structure is easily subjected to the shock force generated by the tapping or the driving torque, thereby causing deflection or misalignment. It affects the actuation effect and reduces the service life.

The pneumatic ratchet wrench (2) of the present invention uses two pivoting members to pivotally connect two hammers, and impacts the hammer anvil by two hammers symmetrical to each other, and increases the contact area by multi-point line contact. The force is averaged, and the vibration and component wear generated during the tapping can be slowed down, not only the relative power loss is small, the transmission torque is improved, and the service life of the component is improved.

The pneumatic ratchet wrench (2) of the present invention is provided with a slope between the anvil and the long shaft body of the anvil for structural reinforcement, and a neck is provided on the long shaft body and the eccentric shaft portion for structural reinforcement, not only The strength of the overall load can reduce the probability of damage to the anvil and the eccentric shaft to improve the service life.

The pneumatic ratchet wrench (2) of the present invention is made of a separate hammer anvil structure to make the manufacture easier, and when any component is damaged, the maintenance is simple and convenient, so as to reduce the use cost. .

Therefore, a pneumatic ratchet wrench (2) proposed by the present invention can be connected to a gas supply device, and the pneumatic ratchet wrench includes a casing unit, a driving unit, a ratchet head unit and an impact clutch unit. The housing unit extends along a first axis and includes a hollow a chamber, an opening disposed on a front end side, and an air inlet port disposed at the tail end and connected to the air supply device. The driving unit is accommodated in the hollow chamber of the housing unit and includes a driving motor and a trigger for controlling gas introduction to start the driving of the driving motor, the driving motor having a toothed mandrel. The ratchet head unit is received in front of the housing unit and includes a power output shaft rotatably passing through the opening, the power output shaft extending along a second axis perpendicular to the first axis. The impact clutch unit is received in the housing unit, and is controlled to rotate by the output shaft of the ratchet head unit via the control of the driving motor, and includes a sleeve and a rotating seat received in the sleeve. a hammer anvil, a second hammer and two pivoting members, wherein the sleeve has a content chamber, two side openings on both sides of the content chamber, a first shaft hole on the first axis, and a first shaft hole a two-axis hole, and two pivot holes parallel to the first axis. The anvil has a long axis body extending along the first axis, an anvil body adjacent to the sleeve, and an eccentric shaft portion away from the sleeve, the anvil body having an anvil portion and two The protruding blocks are symmetrically disposed on both sides of the anvil. The rotating base is connected to the driving motor and has a toothed hole penetrating along the first axis and meshing with a toothed mandrel of the driving motor, and two notches on the left and right sides. The hammers respectively abut against the outer side of the protruding block of the anvil body, each hammer has a circular arc-shaped striking portion corresponding to the anvil portion, and a middle portion extending along the first axis Perforation, and a bump that is snapped into the notch of the rotating base. The pivoting members are inserted from the pivot hole of the sleeve and pivotally connected to the perforations of the hammers, so that the two hammers are placed on the sleeve by the pivotal connection of the two pivoting members. .

a pneumatic ratchet wrench (2) according to the above-mentioned present invention, wherein an anvil of the anvil is perpendicular to a third axis of the first axis and has a diameter smaller than a diameter of the long axis body, and the anvil A slope is connected between the long axis body.

According to the pneumatic ratchet wrench (2) proposed in the above-mentioned present invention, a neck portion is engaged between the eccentric shaft portion of the anvil and the long shaft body.

According to the pneumatic ratchet wrench (2) proposed in the above-mentioned creation, wherein the hitting portion of the hammer has an inner circumference, and when the hammer is driven to deflect, the hitting portion is One end impinges on the anvil, and the inner circumference of the striking portion abuts against the protruding block, thereby allowing the two hammers to be oppositely positioned oppositely to the hook to obtain a smooth impact. effect.

a pneumatic ratchet wrench (2) according to the above-mentioned creation, wherein the housing unit comprises a main housing, a set of grips disposed at a rear end of the main housing, and a set is disposed in the middle of the main housing. An exhaust ring communicating with the hollow chamber, and a hammer cover and a lock ring connected between the ratchet head unit and the main casing, the hammer cover being ringed at the impact clutch On the outer side of the unit, the main housing has a plurality of air holes, and the exhaust ring passes through the air holes of the main housing to communicate with the hollow chamber.

The pneumatic ratchet wrench (2) according to the above-mentioned present invention, wherein the driving unit further comprises a gas supply linkage mechanism, the air supply linkage mechanism having a gas nozzle fixed at a rear end of the main casing, and a mounting a valve body inside the main casing, an elastic member connected between the valve body and the valve stem connected between the trigger and the valve body.

According to the pneumatic ratchet wrench (2) proposed in the above, the second shaft hole diameter of the sleeve of the hammer clutch unit is larger than the aperture of the first shaft hole.

The pneumatic ratchet wrench (2) according to the above-mentioned creation, wherein the anvil has a first collar and a second collar, and the long shaft body and the anvil of the anvil are independent components. The eccentric shaft portion is disposed at one end of the long shaft body, and the other end of the main shaft body is provided with a first joint portion, and the other end of the anvil body is provided with a second joint portion away from the anvil portion, the first collar portion a joint portion is disposed, the first sleeve is sleeved to the outer side of the long shaft body and the anvil body, and the joint portion is combined with the first joint portion and the second joint portion to form a positioning. The second set of rings is sleeved on the outside of the anvil body.

According to the above, in order to solve the problem that the contact area of the impact group of the existing pneumatic tool is small and the force is uneven. The present invention uses two pivoting members to pivot two hammers on the sleeve, and increases the contact area by multi-point line contact by two hammers arranged symmetrically on both sides of the hammer anvil. Averages the force and slows the vibration and component wear caused by the tapping, relative power The loss is small and the torque of the transmission is increased to improve the service life of the anvil. Moreover, the impact clutch unit can handle high-pressure, high-torque power without excessive gear wear without increasing the speed reduction mechanism. In addition, since the force receiving portion of the impact clutch unit falls on the anvil portion of the anvil and the eccentric shaft portion, the slope is engaged between the long shaft body and the anvil portion, and in the eccentric shaft portion and The structural reinforcement of the neck between the long-axis bodies not only strengthens the strength of the overall force, but also reduces the probability of damage to the anvil and the eccentric shaft to improve the service life. Secondly, the separate hammer anvil is easier to manufacture, and when any component is damaged, it is easier to maintain and reduce the cost of use.

10‧‧‧Sheet unit

101‧‧‧ hollow room

11‧‧‧ openings

12‧‧‧ Intake interface

13‧‧‧Main housing

131‧‧‧ stomata

14‧‧‧Handle

15‧‧‧Exhaust ring

16‧‧‧ hammer cover

17‧‧‧Lock ring

20‧‧‧Drive unit

21‧‧‧Drive motor

211‧‧‧ toothed mandrel

22‧‧‧ trigger

23‧‧‧ gas supply linkage mechanism

231‧‧‧ gas nozzle

232‧‧‧ valve body

233‧‧‧Flexible parts

234‧‧‧ valve stem

30‧‧‧Ratch head unit

31‧‧‧Output shaft

40‧‧‧ sleeve

41‧‧‧Content Room

42‧‧‧ side opening

43‧‧‧First shaft hole

44‧‧‧Second shaft hole

45‧‧‧ pivot hole

50‧‧‧ rotating seat

51‧‧‧toothed holes

52‧‧‧ gap

60‧‧‧Anvil

61‧‧‧ long axis body

62‧‧‧Anvil body

621‧‧‧Anvil

622‧‧‧ protruding block

623‧‧‧Second junction

63‧‧‧Eccentric shaft

64‧‧‧ slope

65‧‧‧ neck

66‧‧‧Long-axis body

661‧‧‧ first joint

67‧‧‧Anvil body

671‧‧‧Anvil

672‧‧‧ highlight block

673‧‧‧Second junction

68‧‧‧First ring

681‧‧‧bonding site

69‧‧‧Second ring

70‧‧‧ hammer

71‧‧‧Beat Department

711‧‧‧ inner circumference

72‧‧‧Perforation

73‧‧‧Bumps

80‧‧‧ pivotal parts

100‧‧‧Supply

200‧‧‧ impact clutch unit

300‧‧‧ impact clutch unit

Fig. 1 is a perspective view showing the appearance of a first preferred embodiment of the pneumatic ratchet wrench (2).

Fig. 2 is an exploded perspective view of the pneumatic ratchet wrench (2).

Fig. 3 is a sectional view showing the combination of the pneumatic ratchet wrench (2).

Figure 4 is a cross-sectional view of the impact clutch unit and the outer casing unit extending along a second axis, illustrating the state before the hammers have not been actuated.

Figure 5 is another cross-sectional view of the impact clutch unit and the outer casing unit extending along the second axis, illustrating the state in which the hammers are driven.

Fig. 6 is an exploded perspective view of the impact clutch unit, which is a second preferred embodiment of the pneumatic ratchet wrench (2).

Referring to Figures 1 and 2, a first preferred embodiment of the present pneumatic ratchet wrench can be coupled to a gas supply device 100. The pneumatic ratchet wrench includes a housing unit 10 and a drive unit 20 A ratchet head unit 30 and an impact clutch unit 200.

Referring to FIG. 2 and FIG. 3, the housing unit 10 extends along a first axis L1 and includes a hollow chamber 101, an opening 11 disposed on the front end side, and a rear end disposed at the tail end. An intake port 12 to which the air supply device 100 is connected. The gas sent by the gas supply device 100 can be entered by the intake port 12. In this embodiment, the housing unit 10 is composed of a main housing 13 , a set of grips 14 disposed at the rear end of the main housing 13 , a set of the middle portion of the main housing 13 and connected to the hollow chamber 101 . An exhaust ring 15 , and a hammer cover 16 and a lock ring 17 connected between the ratchet head unit 30 and the main casing 13 , the hammer cover 16 is disposed at the ring The outer casing of the impact clutch unit 200 has a plurality of air holes 131, and the exhaust ring 15 passes through the air holes 131 of the main casing 13 to communicate with the hollow chamber 101.

The driving unit 20 is received in the hollow chamber 101 of the housing unit 10 and includes a driving motor 21, a trigger 22 for controlling gas introduction to start the driving of the driving motor 21, and an air supply linkage mechanism 23. The drive motor 21 has a toothed mandrel 211. The air supply linkage mechanism 23 has a gas nozzle 231 fixed to the rear end of the main casing 13, a valve body 232 installed inside the main casing 13, and a valve body 232 connected to the gas nozzle 231. The elastic member 233 and a valve stem 234 connected between the trigger 22 and the valve body 232.

The ratchet head unit 30 is received in front of the housing unit 10 and includes a power output shaft 31 rotatably passing through the opening 11. The output shaft 31 is along a second perpendicular to the first axis L1. The axis L2 extends. Since the ratchet head unit 30 is not the main technical focus of the present invention, the other detailed structure of the ratchet head unit 30 will not be described in detail herein.

Referring to FIGS. 2 and 3, the impact clutch unit 200 is housed in the housing unit 10, and the output shaft 31 of the ratchet head unit 30 is rotated by the control of the drive motor 21. The clutch unit 200 includes a sleeve 40, a rotating base 50, a hammer anvil 60, a second hammer 70 and two pivoting members 80. The rotating base 50, the hammer 60, the hammers 70 and the pivoting joints The member 80 is housed inside the sleeve 40.

Referring to Figures 2 and 3, the sleeve 40 has a content chamber 41, Two side openings 42 on both sides of the content chamber 41, a first shaft hole 43 and a second shaft hole 44 on the first axis L1, and two pivot holes 45 parallel to the first axis L1. The second shaft hole 44 of the sleeve 40 has a larger diameter than the first shaft hole 43.

The anvil 60 has a long axis body 61 extending along the first axis L1, an anvil body 62 adjacent to the sleeve 40, and an eccentric shaft portion 63 remote from the sleeve 40. The main body 62 has an anvil portion 621 and two protruding blocks 622 protruding symmetrically on both sides of the anvil portion 621. A slope 64 is connected between the anvil 621 of the anvil 60 and the long shaft body 61. In addition, a neck portion 65 is coupled between the eccentric shaft portion 63 of the anvil 60 and the long shaft body 61. The neck portion 65 is coupled between the two to improve the strength of the eccentric shaft portion 63 and avoid stress. And broken.

The rotating base 50 is received in the sleeve 40 and connected to the driving motor 21, and has a toothed hole penetrating along the first axis L1 and meshing with the toothed spindle 211 of the driving motor 21. 51, and two gaps 52 located on the left and right sides.

The hammers 70 are respectively adjacent to the outer side of the protruding block 622 of the anvil body 62. Each of the hammers 70 has a circular arc-shaped striking portion 71 corresponding to the anvil portion 621, and a middle portion and a The first axis L1 extends through the through hole 72 and a protrusion 73 that is caught in the notch 51 of the rotating base 50.

The pivoting members 80 are inserted from the pivot holes 45 of the sleeve 40 and pivotally connected to the through holes 72 of the hammers 70 to pivot the two hammers 70 by the two pivoting members 80. It is placed on the sleeve 40.

Referring to FIG. 4 and FIG. 5, after the gas supply device 100 supplies the gas to the intake port 12, the user holds the grip 14 of the housing unit 10 and presses the trigger 22 to drive it. The drive motor 21 rotates and rotates the rotary base 50 in conjunction therewith. The hammers 70 are pivotally disposed on the pivot holes 45 of the sleeve 40 by the pivoting members 80, and the bumps 73 are connected to the notches 51 of the rotating base 50 to form a connection relationship. When the drive motor When the clock 21 rotates in the clockwise direction, the rotating base 50 rotates synchronously, and the rotating seat 50 aligns the convex portions 73 of the hammers 70 with respect to the two notched 51 sidewalls, so that the two hammers 70 are symmetrical. The connecting member 50 and the pivot hole 45 are rotated in a clockwise direction as a base point, so that the striking portions 71 are deflected, and one end of the striking portion 71 is struck against the anvil portion 62, and an inner peripheral edge 711 of the striking portion 71 is allowed. Abutting against the protruding block 622, the two hammers 70 are oppositely symmetrically hooked to the anvil 60 to achieve a smooth impact effect, and thereby generate a torque to interlock the ratchet head unit 30. Actuation, by this, the creation uses two left and right symmetrical hammer 70 settings, not only the contact area is large, the force is average, and can reduce the vibration and component wear caused by the tapping, the relative power loss is less, the transmission torque Increased to increase the service life of the anvil 60.

The second preferred embodiment of the pneumatic ratchet wrench (2) is connected to a gas supply device 100 as shown in FIG. 1 . The pneumatic ratchet wrench includes a housing unit 10 and a driving unit 20 . A ratchet head unit 30 and an impact clutch unit 300 (see Figure 6). Since the length of the combined state of the impact clutch unit 300 is greater than the combined length of the impact clutch unit 200 in FIG. 1 , in practice, it is only necessary to increase the internal space of the housing unit 10 in FIG. 1 . This is no longer explained.

Referring to FIG. 6, the difference between the second embodiment and the first embodiment is only that the impact clutch unit 300 is different, and the structure of the sleeve 40, the rotating base 50, the hammer 70 and the pivoting member 80 are the same as the foregoing implementation. Since the examples are the same, only the difference structure between the two will be described below.

The maximum difference between the impact clutch unit 300 and the foregoing embodiment is that the anvil 60 further has a first collar 68 and a second collar 69, and the long shaft body 66 and the anvil body 67 of the anvil 60 are respectively Set as a separate component.

One end of the long shaft body 66 is provided with the eccentric shaft portion 63, and the other end of the long shaft body 66 is provided with a first joint portion 661.

The other end of the anvil body 67 is provided with a second joint portion 623 away from the anvil portion 671 and the protruding portion 672.

The first sleeve 68 is provided with a joint portion 681, and is sleeved to the outer side of the long shaft body 66 and the anvil body 67 to engage the first joint portion 661 and the second joint by the joint portion 681. The portion 623 urges the long axis body 66, the anvil body 67 and the first collar 68 to obtain a joint positioning function.

The second collar 69 is sleeved outside the anvil body 67.

Therefore, the second embodiment is to change the original integrated hammer anvil 60 structure to a separate design, that is, by its long axis body 66, anvil body 67, first collar 68 and a second The combination of the ferrules 69 makes the anvil 60 easy to manufacture. The operation and the efficiencies of the second embodiment are the same as those of the first embodiment, and will not be described again.

In summary, the creation of the pneumatic ratchet wrench (2) has the following advantages and effects:

1. Compared with the impact group of the existing ratchet wrench, the hammer hitting type hitting disc has a small contact area and uneven force on the single side impact during the transmission; since the impact clutch unit 200 of the present invention uses two pivotal joints The member 80 pivotally mounts the hammer 70 on the sleeve 40, and uses the hammer 70 disposed on both sides of the anvil 60 to be symmetrical. When the driving motor 21 is operated and frequently impacts, two symmetrical shots are used. The hammer 70 increases the contact area by means of multi-point line contact to average the force, and because of the average impact force, the vibration during the tapping is reduced, the wear of the component is reduced, and the distortion or misalignment of the component is not easily caused. In addition, the component life can be improved, and the effect will be more remarkable when the low rotation speed produces high torque. Moreover, the impact clutch unit 200 can handle high-pressure, high-torque power without excessive gear wear without increasing the speed reduction mechanism.

2. Since the force receiving portion of the impact clutch unit 200 falls on the anvil portion 62 of the anvil 60 and the eccentric shaft portion 63, the slope 64 is engaged between the long shaft body 61 and the anvil portion 62. And the structural reinforcement of the neck portion 65 is provided between the eccentric shaft portion 63 and the long shaft body 61, and not only the strength of the load can be loaded, but also the anvil portion 62 and the eccentric shaft portion 63 can be reduced. The probability of damage to increase the service life.

3. The impact clutch unit 300 in FIG. 6 is simpler in manufacturing by the separate hammer anvil 60 structure, and is more convenient to maintain when any component is damaged, so as to reduce the use. cost.

The above description is only a preferred embodiment of the present invention, and the scope of the present invention cannot be limited by this, that is, the simple equivalent changes and modifications made by the applicant according to the scope of the patent application and the new description of the creation are all It should remain within the scope of this creation patent.

10‧‧‧Sheet unit

11‧‧‧ openings

13‧‧‧Main housing

14‧‧‧Handle

15‧‧‧Exhaust ring

17‧‧‧Lock ring

20‧‧‧Drive unit

21‧‧‧Drive motor

211‧‧‧ toothed mandrel

22‧‧‧ trigger

30‧‧‧Ratch head unit

31‧‧‧Output shaft

40‧‧‧ sleeve

41‧‧‧Content Room

42‧‧‧ side opening

43‧‧‧First shaft hole

44‧‧‧Second shaft hole

45‧‧‧ pivot hole

50‧‧‧ rotating seat

51‧‧‧toothed holes

52‧‧‧ gap

60‧‧‧Anvil

61‧‧‧ long axis body

62‧‧‧ Anvil body

621‧‧‧Anvil

622‧‧‧ protruding block

63‧‧‧Eccentric shaft

64‧‧‧ slope

65‧‧‧ neck

70‧‧‧ hammer

71‧‧‧Beat Department

72‧‧‧Perforation

73‧‧‧Bumps

80‧‧‧ pivotal parts

200‧‧‧ impact clutch unit

Claims (8)

A pneumatic ratchet wrench can be connected to a gas supply device, the pneumatic ratchet wrench comprising: a housing unit extending along a first axis and comprising a hollow chamber, an opening disposed on a front end side, and An air inlet port disposed at the tail end and connected to the air supply device; a driving unit received in the hollow chamber of the housing unit and including a driving motor and a control gas introduction to activate the driving motor a trigger motor having a toothed mandrel; a ratchet head unit received in front of the housing unit and including a force output shaft rotatably passing through the opening, the output shaft being perpendicular to the a second axis of the first axis extends; and an impact clutch unit is received in the housing unit, and is controlled by the driving motor to rotate the output shaft of the ratchet head unit, and includes a sleeve and a capacity a rotating seat, a hammer anvil, a second hammer and two pivoting members disposed in the sleeve, wherein the sleeve has a content chamber and two side openings located at two sides of the content chamber, and is located at the first a number on an axis a shaft hole and a second shaft hole, and a pivot hole parallel to the first axis; the hammer anvil having a long axis body extending along the first axis, an anvil body adjacent to the sleeve, and a The anvil body has an anvil portion and two protruding blocks protruding symmetrically on opposite sides of the anvil portion; the rotating base is connected to the driving motor and has an edge a toothed hole penetrating the first axis and engaging the toothed mandrel of the driving motor, and two notches on the left and right sides; the hammers respectively abutting outside the protruding block of the anvil body, each a hammer having a circular arc-shaped striking portion corresponding to the anvil portion, a perforation at the middle portion extending along the first axis, and a bump stuck in the notch of the rotating seat; The pivoting members are inserted from the pivot hole of the sleeve and pivotally connected to the perforations of the hammers, so that the two hammers are placed on the sleeve by the pivotal connection of the two pivoting members. . The pneumatic ratchet wrench of claim 1, wherein the anvil of the anvil extends perpendicular to a third axis of the first axis and has a smaller diameter than the major axis, and the anvil and the length A slope is connected between the shaft bodies. The pneumatic ratchet wrench of claim 1, wherein a neck portion is engaged between the eccentric shaft portion of the anvil and the long shaft body. The pneumatic ratchet wrench of claim 1, wherein the striking portion of the hammer has an inner circumference, and one end of the striking portion impinges on the anvil when the hammer is driven to deflect. The inner circumference of the striking portion abuts against the protruding block, so that the two hammers are oppositely positioned oppositely to the hook anvil to obtain a smooth impact. The pneumatic ratchet wrench of claim 1, wherein the housing unit comprises a main housing, a set of grips disposed at a rear end of the main housing, and a set is disposed in the middle portion of the main housing and is hollow An exhaust ring communicating with the chamber, and a hammer cover and a lock ring connected between the ratchet head unit and the main casing, the hammer cover being disposed on the outer side of the impact clutch unit The main casing has a plurality of air holes, and the exhaust ring passes through the air holes of the main casing to communicate with the hollow chamber. The pneumatic ratchet wrench of claim 1, wherein the driving unit further comprises a gas supply linkage mechanism, wherein the air supply linkage mechanism has a gas nozzle fixed to a rear end of the main casing, and is mounted on the main a valve body inside the casing, an elastic member connected between the valve body and the valve stem connected between the trigger and the valve body. The pneumatic ratchet wrench of claim 1, wherein the second shaft hole aperture of the sleeve of the hammer clutch unit is larger than the aperture of the first shaft hole. The pneumatic ratchet wrench of claim 1, wherein the anvil has a first collar and a second collar, and the long axis body and the anvil of the anvil are separate components, and the eccentric shaft The portion is disposed at one end of the long shaft body, and the other end of the long shaft body is provided with a first joint portion, and the other end of the anvil body A second joint is disposed away from the anvil, and the first sleeve is provided with a joint portion, and the first sleeve is sleeved to the outer side of the long shaft body and the anvil body to be combined with the joint portion thereof. The first joint portion and the second joint portion form a positioning, and the second sleeve is sleeved outside the anvil body.