Electric tool

Abstract

The utility model discloses an electric tool. The electric tool comprises a handle, an impact assembly, a damping assembly and a rotating assembly. The impact assembly is arranged beside the handle, and the impact assembly and the handle define a containing cavity; the damping assembly is arranged in the containing cavity and comprises a damping unit, and the first end of the damping unit and the handle are fixedly installed. The rotating assembly is arranged in the containing cavity and comprises a universal rotating piece and a connecting rod, the universal rotating piece and the impact assembly are installed in a linkage mode, the first end of the connecting rod is rotationally installed on the universal rotating piece, and the second end of the connecting rod and the second end of the damping unit are rotationally installed. Impact force in multiple directions can be converted into resultant force in the direction of the damping assembly for damping, resonance is not prone to being generated, the damping effect is good, and the user experience feeling is improved.

Description

Technical Field

[0001] The present application belongs to the field of electromechanical technology, and specifically relates to an electric tool. Background Art

[0002] Impact tools such as electric hammers or electric picks are safe, reliable, efficient, and easy to operate. They are widely used in pipeline laying, machinery installation, water supply and drainage facility construction, interior decoration, port facility construction, and other construction projects. The impact tool is used with a pick drill and other drill bits to break, chisel, dig, groove, and cut concrete, masonry structures, and asphalt pavements.

[0003] However, due to the operating characteristics of impact tools, a large amount of vibration perpendicular to the drill bit will be generated during operation, which has a great impact on the operator and a low user experience. The current shock-absorbing structure is mostly based on shock-absorbing pads, springs and other structures. This type of shock-absorbing structure has defects such as a single shock-absorbing direction and a short lifespan.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the application and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0005] The purpose of the present application is to provide an electric tool that can convert impact forces in multiple directions into a combined force along the direction of the shock absorbing component to perform shock absorption, is not prone to resonance, has a good shock absorption effect, and improves user experience.

[0006] In order to achieve the above purpose, the technical solution provided by a specific embodiment of the present application is as follows:

[0007] An electric tool, comprising:

[0008] handle;

[0009] An impact assembly is arranged beside the handle, and the impact assembly and the handle are combined to form a receiving cavity;

[0010] A shock absorbing assembly is arranged in the receiving cavity, wherein the shock absorbing assembly comprises a shock absorbing unit, and a first end of the shock absorbing unit is fixedly mounted to the handle;

[0011] A rotating assembly is arranged in the receiving cavity, and the rotating assembly includes a universal rotating member and a connecting rod installed in linkage with the impact assembly, the first end of the connecting rod is rotatably installed on the universal rotating member, and the second end of the connecting rod is rotatably installed with the second end of the shock absorbing unit.

[0012] In one or more embodiments of the present application, the universal joint includes a connecting arm, one of the universal joint and the impact assembly is provided with a hinge ball, and the other is provided with a spherical body, and the spherical body is provided with a ball groove matching the hinge ball.

[0013] In one or more embodiments of the present application, the articulated ball is fixedly mounted to the impact assembly via a fixing rod, the ball groove is provided on the sphere, and the rotating assembly further comprises a first limiting portion and a second limiting portion spaced apart on the sphere, the first limiting portion and the second limiting portion are relatively arranged along the rotation plane of the connecting rod and are located on both sides of the fixing rod, and the distance between the first limiting portion and the second limiting portion is greater than the outer diameter of the fixing rod and smaller than the diameter of the articulated ball.

[0014] In one or more embodiments of the present application, the connecting arm includes a first arm and a second arm that are relatively arranged, the first end of the connecting rod is rotatably installed between the first arm and the second arm through a first pin, and the second end of the connecting rod is rotatably installed with the second end of the shock absorbing unit through a second pin.

[0015] In one or more embodiments of the present application, the shock absorbing unit includes a plurality of units, at least one of which is rotatably mounted on the first end of the second column pin, and at least one of which is rotatably mounted on the second end of the second column pin.

[0016] In one or more embodiments of the present application, the rotating assembly includes at least two universal rotating members and at least one connecting member, and two ends of the connecting member are respectively rotatably installed between connecting arms of two adjacent universal rotating members.

[0017] In one or more embodiments of the present application, one of the connecting arm and the connecting member is provided with a mounting post, and the other is provided with a mounting hole matched with the mounting post.

[0018] In one or more embodiments of the present application, the rotating assembly further includes a bearing, an inner ring of the bearing abuts against an outer wall of the mounting column, and an outer ring of the bearing abuts against an inner wall of the mounting hole.

[0019] In one or more embodiments of the present application, the shock absorbing unit includes at least one shock absorbing unit, including a first shock absorbing sleeve and a second shock absorbing sleeve arranged opposite to each other, a shock absorbing connecting piece slidably mounted between the first shock absorbing sleeve and the second shock absorbing sleeve, and an elastic piece mounted on the shock absorbing connecting piece, the two ends of the elastic piece are respectively abutted against the first shock absorbing sleeve and the second shock absorbing sleeve, the first shock absorbing sleeve is rotatably mounted on the connecting rod, and the second shock absorbing sleeve is fixedly mounted on the handle.

[0020] In one or more embodiments of the present application, a first sliding groove is opened on the side wall of the first shock-absorbing sleeve along the length direction, and the first end of the shock-absorbing connecting member is sleeved in the first shock-absorbing sleeve through a third pin, and the third pin is slidably set in the first sliding groove; and / or, a second sliding groove is opened on the side wall of the second shock-absorbing sleeve along the length direction, and the second end of the shock-absorbing connecting member is sleeved in the second shock-absorbing sleeve through a fourth pin, and the fourth pin is slidably set in the second sliding groove.

[0021] Compared with the prior art, this application has the following beneficial effects:

[0022] The present application discloses an electric tool, which can convert impact forces in multiple directions into a resultant force along the direction of a shock-absorbing component through a rotating component, and dampen the resultant force through the shock-absorbing component, thereby reducing the impact force generated during the operation of the electric tool and not easily causing resonance. The electric tool has a simple structure, good shock-absorbing effect, and good user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of an electric tool in one embodiment of the present application;

[0025] Figure 2 This is a schematic diagram of the exploded structure of the electric tool in one embodiment of the present application;

[0026] Figure 3 for Figure 2 A magnified view of the local structure in

[0027] Figure 4 It is a first cross-sectional structural schematic diagram of an electric tool in one embodiment of the present application;

[0028] Figure 5 A second cross-sectional structural schematic diagram of the electric tool in one embodiment of the present application;

[0029] Figure 6 for Figure 5 A magnified view of the local structure at point A in the middle;

[0030] Figure 7 It is a schematic diagram of the explosion structure of the shock absorbing assembly in one embodiment of the present application. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0034] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0035] Reference Figure 1 , Figure 2 As shown, the electric tool in one embodiment of the present application includes: a handle 1, an impact assembly 2, a shock absorbing assembly 3, and a rotating assembly 4. The impact assembly 2 is arranged beside the handle 1, and the impact assembly 2 and the handle 1 are enclosed to form a receiving chamber; the shock absorbing assembly 3 is arranged in the receiving chamber, and the shock absorbing assembly 3 includes a shock absorbing unit 31, and the first end of the shock absorbing unit 31 is fixedly installed with the handle 1; the rotating assembly 4 is arranged in the receiving chamber, and the rotating assembly 4 includes a universal rotating member 41 and a connecting rod 42 installed in linkage with the impact assembly 2, the first end of the connecting rod 42 is rotatably installed on the universal rotating member 41, and the second end of the connecting rod 42 is rotatably installed with the second end of the shock absorbing unit 31. Among them, the number of universal rotating members 41 and connecting rods 42 corresponds to each other. According to this design, the rotating assembly 4 in this embodiment can convert the impact force in multiple directions into a resultant force along the direction of the shock absorbing assembly 3, and damp the resultant force through the shock absorbing assembly 3, thereby reducing the impact force generated during the operation of the electric tool, and it is not easy to generate resonance. The electric tool has a simple structure, good shock absorbing effect, and good user experience.

[0036] Specifically, refer to Figure 1 to Figure 3 Combined with Figures 4 to 6As shown, the universal joint 41 in this embodiment includes a connecting arm 411, and one of the universal joint 41 and the impact assembly 2 is provided with a hinge ball 21, and the other is provided with a ball 412, and the ball 412 is provided with a ball groove 4121 that matches the hinge ball 21. Exemplarily, the end of the universal joint 41 is provided with a ball 412, and the impact assembly 2 is provided with a hinge ball 21. Exemplarily, the first end of the connecting rod 42 is rotatably installed between the two ends of the connecting arm 411. Since the articulated ball 21 can rotate in any direction in the ball groove 4121 and the connecting arm 411 can also change direction following the rotation of the articulated ball 21, the universal joint 41 has the effect of being able to rotate at multiple angles. Since the universal joint 41 is rotatably connected to the shock absorbing assembly 3 via the connecting rod 42, the impact force generated during the operation of the power tool can be transmitted to the universal joint 41 through the cooperation of the articulated ball 21 and the ball groove 4121, and then transmitted to the connecting member 47 via the universal joint 41, and then transmitted to the shock absorbing assembly 3 via the connecting member 47, thereby finally achieving comprehensive adjustment at multiple angles.

[0037] For example, refer to Figure 1 to Figure 3 , and combined Figures 4 to 6 As shown, the articulated ball 21 in this embodiment is fixedly installed with the impact assembly 2 through the fixed rod 22, the ball groove 4121 is provided on the ball 412, and the rotating assembly 4 further includes a first limiting portion 43 and a second limiting portion 44 which are spaced apart and arranged on the ball 412, the first limiting portion 43 and the second limiting portion 44 are arranged opposite to each other along the rotation plane of the connecting rod 42 and are located on both sides of the fixed rod 22, and the distance between the first limiting portion 43 and the second limiting portion 44 is greater than the outer diameter of the fixed rod 22 and smaller than the diameter of the articulated ball 21. According to this design, the articulated ball 21 can be stably and securely limited in the receiving cavity, and the articulated ball 21 can only roll inside the receiving cavity, avoiding the articulated ball 21 and the receiving cavity from being separated, and at the same time, the vibration amplitude of the handle 1 in the direction perpendicular to the rotation plane of the connecting rod 42 can be limited, so as to prevent the handle 1 and the impact assembly 2 from having a large swing when the operator is operating, thereby bringing danger to the work in progress.

[0038] Optional, see Figure 2 As shown, the connecting arm 411 in this embodiment includes a first support arm 4111 and a second support arm 4112 that are arranged opposite to each other, the first end of the connecting rod 42 is rotatably mounted between the first support arm 4111 and the second support arm 4112 through a first pin 45, and the second end of the connecting rod 42 is rotatably mounted with the second end of the shock absorbing unit 31 through a second pin 46. According to this design, the connecting rod 42 can be stably and reliably rotatably mounted on the connecting arm 411, so that the impact force is easily transmitted from the universal rotating member 41 to the connecting rod 42.

[0039] Optional, in order to make the structure more stable, the shock absorption more balanced, and improve the shock absorption effect, refer to Figure 2 As shown, the damping unit 31 in this embodiment includes a plurality of units, at least one damping unit 31 is rotatably mounted on the first end of the second column pin 46, and at least one damping unit 31 is rotatably mounted on the second end of the second column pin 46. Exemplarily, the damping unit 31 in this embodiment is provided with two, one of which is rotatably mounted on the first end of the second column pin 46, and the other is rotatably mounted on the second end of the second column pin 46. Of course, the present application is not limited thereto. In another embodiment, the damping unit 31 may also be 4, two of which are rotatably mounted on the first end of the second column pin 46, and the other two are rotatably mounted on the second end of the second column pin 46. In other embodiments, the damping unit 31 may be 6 or 8, etc.

[0040] Optionally, in order to make the structure more stable, the shock absorption more balanced, and further improve the shock absorption effect, refer to Figure 3 As shown, the rotating assembly 4 in this embodiment includes at least two universal rotating members 41 and at least one connecting member 47, and the two ends of the connecting member 47 are respectively rotatably mounted between the connecting arms 411 of two adjacent universal rotating members 41. Exemplarily, in this embodiment, there are two universal rotating members 41, and a connecting member 47 is provided between the two universal rotating members 41. Through the provision of the connecting member 47, the movement of the two universal rotating members 41 can be synchronized, so as to facilitate better and more balanced transmission of the impact force to the shock absorbing assembly 3 through the connecting rod 42. Of course, the present application is not limited to this. In another embodiment, there may be three universal rotating members 41, and then there are two connecting members 47, and a connecting member 47 is provided between each two adjacent universal rotating members 41. In other embodiments, there may be n universal rotating members 41 and (n-1) connecting members 47.

[0041] Further, in order to rotatably mount the connecting member 47 on the connecting arms 411 of the two adjacent universal rotating members 41, refer to Figure 2 , Figure 3As shown, one of the connecting arm 411 and the connecting member 47 in this embodiment is provided with a mounting post, and the other is provided with a mounting hole matched with the mounting post. Exemplarily, the connecting arm 411 is provided with a mounting post, and the connecting member 47 is provided with a mounting hole. In the present application, since the connecting arm 411 includes a first support arm 4111 and a second support arm 4112, a first mounting post 41111 is provided on the surface of the first support arm 4111 away from the second support arm 4112, and a second mounting post (not shown in the drawings) is provided on the surface of the second support arm 4112 away from the first support arm 4111. The connecting member 47 includes a first connecting piece 471 and a second connecting piece 472. The first connecting piece 471 is provided with a first mounting hole 4711 and a second mounting hole 4712, and the second connecting piece 472 is provided with a third mounting hole 4721 and a fourth mounting hole 4722. The first mounting hole 4711 is matched with the first mounting post 41111 of one of the universal rotating members 41, and the second mounting hole 4712 is matched with the first mounting post 41111 of the other universal rotating member 41. The third mounting hole 4721 is matched with the second mounting post of one of the universal rotating members 41, and the fourth mounting hole 4722 is matched with the second mounting post of the other universal rotating member 41. Of course, the present application is not limited to this, and a mounting hole is provided on the connecting arm 411 and a mounting column is provided on the connecting member 47 to achieve the same technical effect.

[0042] Preferably, refer to Figure 3 As shown, the rotating assembly 4 in this embodiment further includes a bearing 470, the inner ring of the bearing 470 abuts against the outer wall of the mounting column, and the outer ring of the bearing 470 abuts against the inner wall of the mounting hole. According to this design, when the impact force is transmitted from the impact assembly 2 to the rotating assembly 4 and then to the shock absorbing assembly 3, when the connecting arm 411 and the connecting member 47 rotate relative to each other, the bearing 470 can reduce the friction between the two, protect the connecting arm 411 and the connecting member 47, and avoid damage to them (i.e., the mounting column and the mounting hole), and at the same time, the rotation between the connecting arm 411 and the connecting member 47 can be smoother.

[0043] Reference Figure 7As shown, the shock absorbing unit 31 in this embodiment includes a first shock absorbing sleeve 311 and a second shock absorbing sleeve 312 arranged opposite to each other, a shock absorbing connector 313 slidably mounted between the first shock absorbing sleeve 311 and the second shock absorbing sleeve 312, and an elastic member 314 mounted on the shock absorbing connector 313, the two ends of the elastic member 314 are respectively in contact with the first shock absorbing sleeve 311 and the second shock absorbing sleeve 312, the first shock absorbing sleeve 311 is rotatably mounted with the connecting rod 42, and the second shock absorbing sleeve 312 is fixedly mounted with the handle 1. Among them, the second shock absorbing sleeve 312 and the handle 1 can be fixedly mounted through an external structure or can be integrally formed. In the process of transmitting the impact force, the first shock absorbing sleeve 311 is subjected to the force transmitted by the connecting rod 42, and the second shock absorbing sleeve 312 is subjected to the reaction force of the handle 1, thereby causing the two ends of the shock absorbing connector 313 to extend into the first shock absorbing sleeve 311 and the second shock absorbing sleeve 312 respectively. The elastic member 314 is compressed, thereby achieving the purpose of shock absorption.

[0044] In order to facilitate the sliding sleeves of the two ends of the shock-absorbing connector 313 in the first shock-absorbing sleeve 311 and the second shock-absorbing sleeve 312 respectively, and to prevent the shock-absorbing connector 313 from being separated from the first shock-absorbing sleeve 311 and the second shock-absorbing sleeve 312 during the shock-absorbing process, Figure 7 As shown, in this embodiment, a first slide groove 3111 is opened on the side wall of the first shock-absorbing sleeve 311 along the length direction, and the first end of the shock-absorbing connecting piece 313 is sleeved in the first shock-absorbing sleeve 311 through the third pin 315, and the third pin 315 is slidably set in the first slide groove 3111; a second slide groove 3121 is opened on the side wall of the second shock-absorbing sleeve 312 along the length direction, and the second end of the shock-absorbing connecting piece 313 is sleeved in the second shock-absorbing sleeve 312 through the fourth pin 316, and the fourth pin 316 is slidably set in the second slide groove 3121.

[0045] It can be seen from the above technical solutions that the present application has the following beneficial effects:

[0046] The present application discloses an electric tool, which can convert impact forces in multiple directions into a resultant force along the direction of a shock-absorbing component through a rotating component, and dampen the resultant force through the shock-absorbing component, thereby reducing the impact force generated during the operation of the electric tool and not easily causing resonance. The electric tool has a simple structure, good shock-absorbing effect, and good user experience.

[0047] In the description of the embodiments of the present application, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the products of the application are conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0048] In the description of the embodiments of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 directly connected, or 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 this application can be understood according to specific circumstances.

[0049] In the description of the embodiments of the present application, it should also be noted that the terms "first", "second", etc. used in this document do not specifically refer to order or sequence, nor are they used to limit the present case. They are only used to distinguish components or operations described with the same technical terms.

[0050] It is obvious to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present application. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0051] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An electric tool, characterized in that: The electric tool comprises: Handle (1); An impact assembly (2) is arranged beside the handle (1), and the impact assembly (2) and the handle (1) are combined to form a receiving cavity; A shock absorbing assembly (3) is arranged in the receiving cavity, the shock absorbing assembly (3) comprises a shock absorbing unit (31), and a first end of the shock absorbing unit (31) is fixedly mounted on the handle (1); A rotating assembly (4) is disposed in the receiving cavity, and the rotating assembly (4) comprises a universal rotating member (41) and a connecting rod (42) which are installed in linkage with the impact assembly (2), wherein a first end of the connecting rod (42) is rotatably mounted on the universal rotating member (41), and a second end of the connecting rod (42) is rotatably mounted on a second end of the shock absorbing unit (31).

2. The electric tool according to claim 1, characterized in that: The universal rotating member (41) comprises a connecting arm (411), one of the universal rotating member (41) and the impact assembly (2) is provided with a hinge ball (21), and the other is provided with a spherical body (412), and the spherical body (412) is provided with a ball groove (4121) matched with the hinge ball (21).

3. The electric tool according to claim 2, characterized in that: The articulated ball (21) is fixedly mounted on the impact assembly (2) via a fixed rod (22); the rotating assembly (4) further comprises a first limiting portion (43) and a second limiting portion (44) which are spaced apart on the ball (412); the first limiting portion (43) and the second limiting portion (44) are arranged opposite to each other along a rotation plane of the connecting rod (42) and are located on both sides of the fixed rod (22); the distance between the first limiting portion (43) and the second limiting portion (44) is greater than the outer diameter of the fixed rod (22) and less than the diameter of the articulated ball (21).

4. The electric tool according to claim 2, characterized in that: The connecting arm (411) comprises a first support arm (4111) and a second support arm (4112) which are arranged opposite to each other; the first end of the connecting rod (42) is rotatably mounted between the first support arm (4111) and the second support arm (4112) via a first column pin (45); the second end of the connecting rod (42) is rotatably mounted with the second end of the shock absorbing unit (31) via a second column pin (46).

5. The electric tool according to claim 4, characterized in that: The shock absorbing units (31) include a plurality of shock absorbing units (31), at least one of which is rotatably mounted on the first end of the second column pin (46), and at least one of which is rotatably mounted on the second end of the second column pin (46).

6. The electric tool according to claim 2, characterized in that: The rotating assembly (4) comprises at least two universal rotating parts (41) and at least one connecting part (47), and two ends of the connecting part (47) are respectively rotatably mounted between connecting arms (411) of two adjacent universal rotating parts (41).

7. The electric tool according to claim 6, characterized in that: One of the connecting arm (411) and the connecting piece (47) is provided with a mounting column, and the other is provided with a mounting hole matched with the mounting column.

8. The electric tool according to claim 7, characterized in that: The rotating assembly (4) further comprises a bearing (470), wherein the inner ring of the bearing (470) abuts against the outer wall of the mounting column, and the outer ring of the bearing (470) abuts against the inner wall of the mounting hole.

9. The electric tool according to claim 1, characterized in that: The shock absorbing unit (31) comprises at least one shock absorbing unit (31), comprising a first shock absorbing sleeve (311) and a second shock absorbing sleeve (312) which are arranged opposite to each other, a shock absorbing connecting piece (313) which is slidably mounted between the first shock absorbing sleeve (311) and the second shock absorbing sleeve (312), and an elastic piece (314) which is mounted on the shock absorbing connecting piece (313), wherein two ends of the elastic piece (314) are respectively in contact with the first shock absorbing sleeve (311) and the second shock absorbing sleeve (312), the first shock absorbing sleeve (311) is rotatably mounted on the connecting rod (42), and the second shock absorbing sleeve (312) is fixedly mounted on the handle (1).

10. The electric tool according to claim 9, characterized in that: A first slide groove (3111) is provided on the side wall of the first shock-absorbing sleeve (311) along the length direction, and the first end of the shock-absorbing connecting piece (313) is sleeved in the first shock-absorbing sleeve (311) through a third pin (315), and the third pin (315) is slidably set in the first slide groove (3111); and / or, a second slide groove (3121) is provided on the side wall of the second shock-absorbing sleeve (312) along the length direction, and the second end of the shock-absorbing connecting piece (313) is sleeved in the second shock-absorbing sleeve (312) through a fourth pin (316), and the fourth pin (316) is slidably set in the second slide groove (3121).

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