Direct-acting type hammer

Abstract

The invention discloses a direct-acting type hammer, and belongs to the technical field of universal tools. The hammer comprises a hammer body, a grab handle and a hammer rod, a first hole position is formed in the hammer body in the circumferential direction and used for installing a gear device. The grab handle is arranged on the hammer body in a sleeving mode, a first tooth profile is arranged in the grab handle, and the first tooth profile can be meshed with the gear device when the grab handle moves; and the hammer rod is arranged in the hammer body, a second tooth profile is arranged on the hammer rod, and the second tooth profile can be meshed with the gear device to enable the hammer rod to ascend when the grab handle moves downwards. The gear device is discontinuously meshed with the second tooth profile, so that the single hammer rod achieves intermittent multiple times of beating, the use effect of the hammer is improved, and fatigue of a user is not likely to be caused.

Description

Technical Field

[0001] The invention belongs to the technical field of general tools, and in particular relates to a direct-acting hand hammer. Background Art

[0002] With the continuous development of industrial production, the production, repair and maintenance of various equipment parts are increasing. Therefore, people have put forward higher requirements on the efficiency and reliability of tools. They need a convenient, practical hand hammer that can quickly and accurately perform knocking operations to improve work efficiency and product quality.

[0003] In order to improve the knocking efficiency, the Chinese utility model patent with the authorization announcement number CN212887441U discloses a high-efficiency hammer head, including a mother hammer head, a sub-hammer head and an elastic member. The mother hammer head is provided with a receiving cavity inside, the sub-hammer head and the elastic member are both arranged in the receiving cavity, the sub-hammer head and the mother hammer head are connected by the elastic member, and the sub-hammer head moves in the receiving cavity. When the hammer head hits, the mother hammer head first hits the object to form a primary impact, and the sub-hammer head collides with the bottom of the mother hammer head receiving cavity due to inertia and the elastic force of the elastic member, thereby forming a secondary impact on the object.

[0004] Its shortcomings are: 1. If you want to achieve intermittent multiple strikes, you can increase the number of sub-hammer heads to meet the usage needs, but this also increases the weight of the hammer head, which greatly affects the use effect of the hammer; 2. If a sub-hammer head is connected to multiple elastic parts, the top and bottom of the mother hammer head can be used as striking surfaces, but it is easy to cause user fatigue. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a direct-acting hand hammer that can achieve intermittent multiple strikes through a single hammer rod, thereby improving the use effect of the hand hammer and not easily causing fatigue to the user.

[0006] To achieve the above object, the present invention is implemented by adopting the following technical solutions: The present invention provides a direct-acting hand hammer, comprising a hammer body, a handle, and a hammer rod; the hammer body is circumferentially provided with a first hole for installing a gear device; the handle is sleeved on the hammer body, and a first tooth shape is arranged inside the handle, and the first tooth shape can engage with the gear device when the handle moves; the hammer rod is placed in the hammer body, and a second tooth shape is arranged on the hammer rod, and the second tooth shape can engage with the gear device when the handle moves downward, so that the hammer rod rises.

[0007] Optionally, the first hole position is circumferentially provided with a second hole position for plugging into the gear device, and the gear device includes a complete gear, an incomplete gear, and a ratchet; the complete gear is provided with a third hole position for clamping the ratchet; the incomplete gear is provided with a fourth hole position for installing the ratchet, and the fourth hole position is circumferentially provided with a fifth hole position, and the fifth hole position is used for installing a pawl that meshes with the ratchet, and a first spring is provided between the pawl and the fifth hole position, which is used to push the pawl to reset after the ratchet pushes the pawl to move along the fifth hole position; the ratchet is provided with a sixth hole position for plugging into the ratchet shaft, and the ratchet shaft passes through the sixth hole position and is plugged into the second hole position.

[0008] Optionally, the incomplete gear is circumferentially provided with gear tooth segments and truncated gear tooth segments, the gear tooth segments of the incomplete gear are meshed with the second tooth profile, and the gear teeth of the complete gear are meshed with the first tooth profile.

[0009] Optionally, a first groove is provided on one side of the first tooth shape, and the width of the first groove is not less than the tooth width of the incomplete gear; a second groove is provided on one side of the second tooth shape, and the width of the second groove is not less than the tooth width of the complete gear.

[0010] Optionally, the hammer body includes a first shell and a second shell arranged on one side of the first shell, the first hole is arranged on the first shell, and the handle is sleeved on the first shell; a first cavity is arranged in the first shell, a second cavity is arranged in the second shell, and a third cavity is arranged between the first cavity and the second cavity.

[0011] Optionally, the hammer rod is provided with a barrier portion for limiting the moving range of the hammer rod, and one end face of the barrier portion is in contact with the bottom of the first cavity; one side of the barrier portion is provided with a striking portion, and the striking portion passes through the third cavity and is placed in the second cavity.

[0012] Optionally, it further includes an upper cover, on which a second thread is provided; a fourth cavity is also provided on the other side of the first cavity, on which a first thread is screwed to the second thread.

[0013] Optionally, a third shell is provided on the upper cover, and the third shell is used to accommodate the hammer rod when the hammer rod moves upward, and the second thread is provided on the third shell.

[0014] Optionally, it also includes a spring seat, which is arranged in the third shell, and the hammer rod is provided with a fifth cavity for installing a second spring; one end of the second spring is sleeved on the spring seat, and the other end is placed in the fifth cavity.

[0015] The direct-acting hand hammer provided by the present invention, when in use, holds the handle and moves it downward, the first tooth-shaped meshing gear device in the handle drives it to rotate, the gear device meshes with the second tooth shape on the hammer rod to make the hammer rod rise, and after the meshing of the second tooth shape gear teeth fails, the hammer rod falls to hit the object. The present invention enables a single hammer rod to achieve intermittent multiple strikes through the intermittent meshing of the gear device and the second tooth shape, thereby improving the use effect of the hand hammer and not easily causing fatigue to the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of a direct-acting hand hammer provided by an embodiment of the present invention; Figure 2 It is a structural schematic diagram of a hammer provided by an embodiment of the present invention; Figure 3 is a structural schematic diagram of a handle provided by an embodiment of the present invention; Figure 4 It is a structural schematic diagram of a hammer rod provided by an embodiment of the present invention; Figure 5 yes Figure 1 A partial enlarged view of the gear device on the left side of the middle; Figure 6 yes Figure 1 Schematic diagram of the structure of the meshing gear device.

[0018] In the figure: 1- hammer; 101A-first hole; 101B-second hole; 104A-first shell; 104B-second shell; 105A-first cavity; 105B-second cavity; 105C-third cavity; 105D-fourth cavity; 108-first thread; 2-handle; 202-first tooth shape; 203-first groove; 3- hammer rod; 302 - second tooth shape; 303 - second groove; 305 - fifth cavity; 306 - barrier portion; 307 - striking portion; 4-full gear; 401-third hole position; 5- incomplete gear; 501A- fourth hole; 501B- fifth hole; 6-ratchet; 601-sixth hole position; 7- pawl; 8- first spring; 9-ratchet shaft; 10-upper cover; 1004-third shell; 1008-second thread; 11-spring seat; 12- Second spring. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention. Embodiment 1

[0020] refer to Figures 1 to 4 , this embodiment provides a direct-acting hand hammer, including a hammer body 1, a handle 2, and a hammer rod 3; the handle 2 is installed outside the hammer body 1, and the hammer rod 3 is placed inside the hammer body 1. Among them, a first hole 101A for installing a gear device is provided in the upper and middle part of the hammer body 1. The first hole 101A is a rectangular four-sided hole evenly distributed along the radial direction. The width of the four-sided hole should not be less than the width of the gear device, so as to provide space for the smooth operation of the gear. The gear device is the driving mechanism of the hand hammer. By connecting the hammer body 1, the handle 2, and the hammer rod 3, the movement of the handle 2 drives the rotation of the gear device, thereby driving the hammer rod 3 to hit the object. Specifically, the inner wall of the handle 2 is provided with a first tooth shape 202. When the handle 2 moves down or up, the first tooth shape 202 can engage with the gear device and drive the gear device to rotate outward or inward; the surface of the hammer rod 3 is provided with a second tooth shape 302. When the handle 2 moves down and drives the gear device to rotate outward, the second tooth shape 302 can engage with the gear device to drive the hammer rod 3 to rise.

[0021] When the direct-acting hammer is used, the handle 2 is held and moved downward, and the first tooth shape 202 in the handle 2 engages with the gear device to drive it to rotate outward. Figure 1 As shown in the left gear device, the left gear device will rotate counterclockwise; since the gear device engages with the second tooth shape 302 on the hammer rod 3, it will drive the hammer rod 3 to rise; when the gear teeth of the second tooth shape 302 fail to engage with the gear device, the hammer rod 3 falls and hits the object; the handle 2 continues to be moved down, and the above process is repeated. Through the intermittent engagement of the gear device with the second tooth shape 302, the effect of the hammer rod 3 intermittently hitting the object multiple times is achieved.

[0022] Furthermore, a second hole 101B is provided in the middle of the hole wall of the first hole 101A to facilitate the insertion of the gear device. Figure 5As shown, the gear device includes a complete gear 4, an incomplete gear 5, and a ratchet 6; the complete gear 4 is a cylindrical spur gear, and the circumferential surface is all gear teeth, which mesh with the first tooth shape 202, and the middle of its end surface is provided with a third hole position 401 for clamping the ratchet 6, so that the complete gear 4 rotates together with the ratchet 6; the incomplete gear 5 is also a cylindrical spur gear, and the circumferential surface is provided with gear tooth segments and truncated gear tooth segments staggered with the gear tooth segments, the gear tooth segments mesh with the second tooth shape 302, and the middle of its end surface is provided with a fourth hole position 501A for mounting the ratchet 6, and the fourth hole position 501 A fifth hole position 501B is circumferentially provided on the hole wall of A. The fifth hole position 501B is a uniformly distributed rectangular hole for facilitating the installation of the pawl 7 and the first spring 8. The circumferential surface of the ratchet 6 is all ratchet teeth. After the ratchet 6 is installed in the third hole position 401 on the complete gear 4, it passes through the fourth hole position 501A on the incomplete gear 5 and meshes with the pawl 7 installed in the fifth hole position 501B, so that when the complete gear 4 rotates outward, the incomplete gear 5 is driven to rotate together. Therefore, the tooth width of the ratchet 6 should not be less than the sum of the tooth widths of the complete gear 4 and the tooth widths of the incomplete gear 5.

[0023] The pawl 7 is a prism with a quadrilateral cross section. One side of the quadrilateral in contact with the first spring 8 is an arc, and the other three sides are straight lines, which is convenient for engaging the fifth hole 501B and meshing the ratchet 6. The first spring 8 is a cylindrical compression spring with a very small spring wire diameter arranged between the pawl 7 and the fifth hole 501B. When the handle 2 moves upward, the full gear 4 rotates inward, such as Figure 5 As shown, when the left full gear 4 rotates clockwise and the ratchet 6 pushes the pawl 7 to rotate, the pawl 7 will be squeezed by the ratchet 6 and move along the inner side of the fifth hole 501B due to the one-way drive, and the first spring 8 will be compressed; after the ratchet teeth of the ratchet 6 pass the position of the pawl 7, the first spring 8 will push the pawl 7 to reset and continue to engage the ratchet 6. In addition, a sixth hole 601 for mounting the ratchet shaft 9 is provided in the middle of the end surface of the ratchet 6, and the gear device is inserted into the second hole 101B through the ratchet shaft 9 passing through the sixth hole 601, so as to be installed in the hammer body 1.

[0024] When using a direct-acting hammer, place the hammer above the object to be struck, hold the handle 2 of the hammer and pull it downward, the first tooth shape 202 on the inner wall of the handle 2 meshes with the gear teeth of the complete gear 4, driving the complete gear 4 and the ratchet 6 to rotate outward; at this time, the ratchet 6 will interfere with the pawl 7 to generate an outward thrust, thereby driving the pawl 7 and the incomplete gear 5 to rotate outward together; because the gear tooth segment of the incomplete gear 5 meshes with the second tooth shape 302 on the hammer rod 3, the hammer rod 3 will be driven to rise during the engagement. When the incomplete gear 5 rotates to the point where the gear tooth segment is cut off, the engagement between the incomplete gear 5 and the second tooth shape 302 fails, the hammer body 1 and the hammer rod 3 separate, the hammer rod 3 moves downward, lands and strikes the object, completing a striking action, and the hammer rod 3 is reset. Continue to pull the handle 2 downward, repeat the above process until the lower end of the handle 2 reaches the limit position, and the effect of the hammer rod 3 striking the object intermittently multiple times is achieved.

[0025] After the direct-acting hammer is used, the handle 2 of the hammer is pulled upward, and the complete gear 4 and the ratchet 6 rotate inward. Due to the one-way drive of the ratchet 6, the pawl 7 is pressed back into the fifth hole 501B by the ratchet 6, and the incomplete gear 5 does not rotate, and cannot drive the hammer rod 3 to move. Continue to pull the handle 2 upward, and repeat the above process until the handle 2 is reset.

[0026] In this embodiment, if Figure 6 As shown, the first tooth profile 202 and the second tooth profile 302 are both axial straight teeth uniformly distributed along the radial direction, meshing with the complete gear 4 and the incomplete gear 5 respectively, therefore, an axial first groove 203 can be provided on one side of the first tooth profile 202 to facilitate accommodating the incomplete gear 5, and an axial second groove 303 can be provided on one side of the second tooth profile 302 to facilitate accommodating the complete gear 4. Moreover, the width of the first groove 203 is not less than the tooth width of the incomplete gear 5, and the width of the second groove 303 is not less than the tooth width of the complete gear 4, so that while ensuring the contact of the working tooth surfaces, a gap is left between the non-working tooth surfaces to avoid interfering with the rotation of each gear and causing device failure.

[0027] It should be noted that the gear device, the first hole position 101A, the second hole position 101B, the first tooth shape 202, the first groove 203, the second tooth shape 302, the second groove 303, the fifth hole position 501B, the pawl 7, and the first spring 8 are all set to four; the gear tooth segment and the truncated gear tooth segment of the incomplete gear 5 are both set to two. As an optional embodiment, if it is necessary to improve the accuracy of the hammer or save costs, the gear device, the first hole position 101A, the second hole position 101B, the first tooth shape 202, the first groove 203, the second tooth shape 302, and the second groove 303 can all be set to at least two; if it is necessary to reduce the knocking force or increase the knocking speed, the gear tooth segment and the truncated gear tooth segment of the incomplete gear 5 can all be set to at least one; if it is necessary to increase the knocking speed or save costs, the fifth hole position 501B, the pawl 7, and the first spring 8 can all be set to at least one. In the actual manufacturing process, the corresponding number of each structure can be set according to actual use requirements. Embodiment 2

[0028] This embodiment provides a direct-acting hand hammer, which is different from the first embodiment in that Figure 2 and Figure 4 The hammer body 1 includes a first shell 104A, which is provided with a first cavity 105A in the shape of an irregular octagonal prism. The first hole 101A in the first embodiment is provided on the first shell 104A, and the handle 2 is also sleeved on the first shell 104A. A second shell 104B is provided on one side of the first shell 104A, which is provided with a second cavity 105B, and a third cavity 105C is provided between the two cavities, and the hammer rod 3 is placed in the three cavities of the hammer body 1. In addition, the hammer rod 3 is an irregular octagonal prism adapted to the first cavity 105A, and is provided with a barrier portion 306 and a striking portion 307 located on one side of the barrier portion 306. One side end surface of the barrier portion 306 contacts the bottom of the first cavity 105A, which is convenient for limiting the moving range of the hammer rod 3; the striking portion 307 passes through the third cavity 105C and is placed in the second cavity 105B, and its end is a spherical surface, which is convenient for striking uneven objects.

[0029] It should be noted that, since the handle 2 is sleeved on the first shell 104A, the cross-sectional area of ​​the second shell 104B should be larger than the first shell 104A and equal to the handle 2. In order to prevent the hammer rod 3 from exceeding the hammer body 1 during movement, the cross-sectional area of ​​the barrier portion 306 can be set to be larger than the third cavity 105C and smaller than the first cavity 105A.

[0030] Further, such as Figure 1 and Figure 2As shown, in order to facilitate the installation of the hammer rod 3, a fourth cavity 105D is further provided on the other side of the first cavity 105A. At this time, the four cavities in the hammer body 1 are connected, and the fourth cavity 105D is provided with a first thread 108. In addition, the direct-acting hand hammer can also be installed with an upper cover 10, and the upper cover 10 is provided with a second thread 1008 screwed to the first thread 108. In order to better screw the first thread 108 and the second thread 1008, a fine pitch thread with a smaller pitch can be used. Embodiment 3

[0031] This embodiment provides a direct-acting hand hammer, which is different from the second embodiment in that Figure 1 As shown, in order to prevent the hammer rod 3 from popping out from the upper cover 10 and to improve the safety factor, a third shell 1004 is provided on the upper cover 10. The third shell 1004 is used to accommodate the hammer rod 3 when the hammer rod 3 moves upward. Therefore, the cross-sectional area of ​​the third shell 1004 should not be smaller than the hammer rod 3. The second thread 1008 in the second embodiment is provided on the third shell 1004.

[0032] In some embodiments, in order to increase the striking force, the direct-acting hand hammer can also be installed on the spring seat 11 in the third housing 1004; in addition, the hammer rod 3 is also provided with a fifth cavity 305 for accommodating the second spring 12. The second spring 12 is a cylindrical compression spring, one end of which is sleeved on the spring seat 11 and the other end is placed in the fifth cavity 305, thereby limiting the position of the second spring 10.

[0033] When using the direct-acting hammer in this embodiment, the hammer is placed above the object to be struck, the handle 2 of the hammer is held and pulled downward, driving the complete gear 4, the ratchet 6, the pawl 7, and the incomplete gear 5 to rotate outward together; since the gear tooth segment of the incomplete gear 5 is meshed with the second tooth shape 302, the hammer rod 3 is driven to rise during the meshing period, and the second spring 10 is compressed during the rising process. When the incomplete gear 5 rotates to the point where the gear tooth segment is cut off, the meshing of the incomplete gear 5 with the second tooth shape 302 fails, the hammer body 1 and the hammer rod 3 are separated, and the elastic potential energy accumulated in the second spring 10 is released, quickly pushing the hammer rod 3 downward, causing the end face of the striking portion 307 to strike the object, completing a striking action, and the hammer rod 3 is reset. Continue to pull the handle 2 downward and repeat the above process until the lower end of the handle 2 contacts the end surface of one side of the second shell 104B and reaches the limit position; before the working stroke of the handle 2 ends, the hammer rod 3 can intermittently strike the object multiple times, thereby improving the use effect of the hand hammer and not easily causing fatigue to the user.

[0034] In the embodiments of the present invention, the structural parts are mostly cylinders or circular holes, and the shell and the cavity are mostly coaxially arranged. The description of the shapes and cross-sectional sizes of all structural parts in the direct-acting hand hammer is to more clearly illustrate the technical solution of the present invention; in actual use, they can also be set to other shapes and other cross-sectional sizes according to actual conditions to meet the use requirements.

[0035] In the description of the present invention, it should be understood that the terms "center", "radial", "axial", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "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 a direct connection, or it can be indirectly connected 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 by specific circumstances.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A direct-acting hand hammer, characterized in that: It comprises a hammer body (1), a handle (2), and a hammer rod (3); The hammer body (1) is provided with a first hole (101A) in the circumferential direction for installing a gear device; The handle (2) is sleeved on the hammer body (1), and a first tooth shape (202) is provided in the handle (2), and the first tooth shape (202) is capable of engaging with the gear device when the handle (2) moves; The hammer rod (3) is disposed in the hammer body (1), and a second tooth shape (302) is provided on the hammer rod (3). When the handle (2) moves downward, the second tooth shape (302) can engage with the gear device to make the hammer rod (3) rise.

2. The direct-acting hammer according to claim 1, characterized in that: The first hole (101A) is provided with a second hole (101B) in the circumferential direction for plugging the gear device, wherein the gear device comprises a complete gear (4), an incomplete gear (5) and a ratchet (6); The complete gear (4) is provided with a third hole (401) for engaging the ratchet wheel (6); The incomplete gear (5) is provided with a fourth hole (501A) for mounting the ratchet (6), the fourth hole (501A) is provided with a fifth hole (501B) in a circumferential direction, the fifth hole (501B) is used for mounting a pawl (7) meshing with the ratchet (6), and a first spring (8) is provided between the pawl (7) and the fifth hole (501B) for pushing the pawl (7) to return to its original position after the ratchet (6) pushes the pawl (7) to move along the fifth hole (501B); The ratchet (6) is provided with a sixth hole (601) for inserting the ratchet shaft (9), and the ratchet shaft (9) passes through the sixth hole (601) and is inserted into the second hole (101B).

3. The direct-acting hammer according to claim 2, characterized in that: The incomplete gear (5) is provided with gear tooth segments and truncated gear tooth segments in the circumferential direction; the gear tooth segments of the incomplete gear (5) mesh with the second tooth shape (302); and the gear teeth of the complete gear (4) mesh with the first tooth shape (202).

4. The direct-acting hammer according to claim 2 or 3, characterized in that: A first groove (203) is provided on one side of the first tooth shape (202), and the width of the first groove (203) is not less than the tooth width of the incomplete gear (5); and a second groove (303) is provided on one side of the second tooth shape (302), and the width of the second groove (303) is not less than the tooth width of the complete gear (4).

5. The direct-acting hammer according to claim 1, characterized in that: The hammer body (1) comprises a first shell (104A) and a second shell (104B) arranged on one side of the first shell (104A), the first hole (101A) is arranged on the first shell (104A), and the handle (2) is sleeved on the first shell (104A); A first cavity (105A) is provided in the first shell (104A), a second cavity (105B) is provided in the second shell (104B), and a third cavity (105C) is provided between the first cavity (105A) and the second cavity (105B).

6. The direct-acting hammer according to claim 5, characterized in that: The hammer rod (3) is provided with a barrier portion (306) for limiting the moving range of the hammer rod (3), and one end surface of the barrier portion (306) is in contact with the bottom of the first cavity (105A); one side of the barrier portion (306) is provided with a striking portion (307), and the striking portion (307) passes through the third cavity (105C) and is placed in the second cavity (105B).

7. The direct-acting hammer according to claim 5 or 6, characterized in that: It also comprises an upper cover (10), on which a second thread (1008) is provided; a fourth cavity (105D) is provided on the other side of the first cavity (105A), and the fourth cavity (105D) is provided with a first thread (108) screwed to the second thread (1008).

8. The direct-acting hammer according to claim 7, characterized in that: A third shell (1004) is provided on the upper cover (10), and the third shell (1004) is used to accommodate the hammer rod (3) when the hammer rod (3) moves upward, and the second thread (1008) is provided on the third shell (1004).

9. The direct-acting hammer according to claim 8, characterized in that: It also includes a spring seat (11), the spring seat (11) being arranged in the third housing (1004), and the hammer rod (3) being provided with a fifth cavity (305) for mounting a second spring (12); one end of the second spring (12) being sleeved on the spring seat (11), and the other end being placed in the fifth cavity (305).

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