Manual and automatic feed switching mechanism

Abstract

The invention provides a manual and automatic feeding switching mechanism which comprises a drilling machine, a lifting shaft is installed in the middle of the drilling machine, a containing groove is formed in one end of the lifting shaft, a linear clamping groove is formed in the side portion of the lifting shaft, the automatic feeding mechanism comprises a transmission gear coaxial with the lifting shaft, and a clamping groove is formed in the other end of the lifting shaft. A group of clamping blocks extending into the linear clamping grooves are elastically mounted on the inner wall of the transmission gear; the manual feeding mechanism comprises an operating rod installed in the containing groove in a sliding mode, and a transmission block sliding along the linear clamping groove is arranged on the side portion of the inner end of the operating rod. According to the drilling machine, the containing groove is formed in the lifting shaft of the drilling machine, the operating rod and the handle are arranged in the containing groove in a sliding mode, in the automatic feeding mode, the situation that the handle is exposed and is easily touched by a worker by mistake is avoided, and the practicability and safety of the drilling machine are improved; the handle can be manually rotated to control the operation rod and the lifting shaft to synchronously rotate to achieve manual feeding, and operation is rapid and convenient.

Description

Technical Field

[0001] This invention relates to the field of drilling machine feed mechanisms, and more specifically, to a manual and automatic feed switching mechanism. Background Technology

[0002] Drilling machines, as a basic and widely used processing equipment, play an important role in many fields such as machinery manufacturing, building installation, and steel structure construction. Among them, magnetic drills are particularly suitable for on-site, high-altitude, and large component processing scenarios due to their convenient characteristic of using a magnetic base to adhere to steel workpieces for drilling operations. The magnetic drills commonly found on the market are mainly divided into two categories: ordinary magnetic drills and automatic feed magnetic drills. Ordinary magnetic drills usually rely on operators to manually apply feed force, while automatic feed magnetic drills have a built-in drive device that can realize automatic feed of the drill bit.

[0003] Currently, there are also some existing magnetic drills that have both manual and automatic feed functions. For example, a magnetic drill with automatic feed function disclosed in Chinese Utility Model Patent (Application No.: CN202323582619.1) is operated by moving the handle away from the magnetic bed, which moves the drive shaft into the magnetic bed and allows the end of the drive shaft to fit into the groove of the motor, thus achieving automatic feed. When the handle is moved closer to the magnetic bed, the drive shaft moves outward, disengaging from the motor, and the drill is then in manual mode. By utilizing the lever principle, the magnetic drill can switch between manual and automatic feed functions, reducing the skill requirements and labor intensity of the operator, and effectively improving work efficiency and drilling quality. However, in actual use, it was found that the automatic feed mode on the drilling rig is generally used most frequently. If the handle is installed as an integral part of the drilling rig and is exposed, the handle is very likely to come into accidental contact with the motor or transmission mechanism due to accidental touch by personnel, equipment vibration, or environmental impact, which poses a threat to the safety of the equipment and personnel. If the handle is designed to be detachable from the main body of the drilling rig to avoid accidental touch, then an additional installation, connection, and calibration process must be performed before each switch to manual mode. After use, it must be disassembled and stored, which increases the complexity of operation and preparation time, and reduces the practicality and operating efficiency of the drilling rig.

[0004] Therefore, we have made improvements to this by proposing a manual and automatic feed switching mechanism. Summary of the Invention

[0005] The purpose of this invention is to address the problem that, in existing drill rigs, the handle is integrally mounted on the drill rig and exposed, making it highly susceptible to accidental contact with the motor or transmission mechanism due to human error, equipment vibration, or environmental impact, posing a threat to the safety of the equipment and personnel. If the handle is designed to be detachable from the drill rig body to avoid accidental contact, additional installation, connection, and calibration procedures are required before each switch to manual mode, and it must be disassembled and stored after use, increasing the complexity of operation and preparation time, and reducing the practicality and operational efficiency of the drill rig.

[0006] To achieve the above-mentioned objectives, the present invention provides the following manual and automatic feed switching mechanism to improve the aforementioned problems.

[0007] The application is as follows: A manual and automatic feed switching mechanism includes a drilling rig and a drilling mechanism mounted on the outside of the drilling rig. A lifting shaft for controlling the vertical linear movement of the drilling mechanism is mounted in the middle of the drilling rig. A lifting gear is mounted on the lifting shaft. One end of the lifting shaft has a receiving groove, and the side of the lifting shaft has a linear slot communicating with the receiving groove. The mechanism also includes: The automatic feed mechanism includes a transmission gear rotatably mounted on the drilling rig and coaxial with the lifting shaft, and a drive component mounted on the drilling rig and connected to the transmission gear in a transmission manner. A set of locking blocks extending into the linear slot are elastically installed on the inner wall of the transmission gear. The manual feed mechanism includes an operating rod slidably installed in the receiving groove. The inner end of the operating rod has a transmission block that slides along a linear slot. When the transmission block is below the slot, it pushes the slot out of the linear slot.

[0008] As a preferred technical solution of this application, one end of the drilling rig has a sliding part for the drilling mechanism to be raised and lowered, the lifting shaft is installed on the top of the sliding part and one end extends outside the sliding part, the side of the sliding part has a mounting part coaxial with the lifting shaft, and the transmission gear is installed in the mounting part.

[0009] As a preferred technical solution of this application, the transmission gear is a worm gear, the driving component is a motor installed on one side of the mounting part, and the output end of the motor is equipped with a worm that is adapted and connected to the worm gear.

[0010] As a preferred technical solution of this application, an end cap is installed at the end of the mounting part, and a rotating block is rotatably installed in the middle of the end cap. When the operating rod is located in the receiving groove, its outer end slides against the rotating block.

[0011] As a preferred technical solution of this application, the outer end of the transmission block is located outside the lifting shaft, and the transmission block has a first inclined surface on the side facing the card block. The distance from the bottom end of the first inclined surface to the axis of the lifting shaft is less than the distance from the inner end of the card block to the axis of the lifting shaft.

[0012] As a preferred technical solution of this application, the outer end of the transmission block is provided with a second inclined surface on both sides of the lifting shaft in the circumferential direction, and the bottom end of the card block is provided with a third inclined surface on both sides corresponding to the second inclined surface.

[0013] As a preferred technical solution of this application, the outer end of the operating rod has a pair of connecting blocks, and a handle is rotatably mounted on the two connecting blocks. The handle slides with the operating rod and is placed in the receiving groove, and the outer end of the handle slides against the rotating block.

[0014] As a preferred technical solution of this application, the outer end of the handle is provided with a through hole, and both the operating rod and the inner end of the handle have annular protrusions that are adapted to and slidably connected to the receiving groove.

[0015] As a preferred technical solution of this application, the outer side of the middle part of the lifting shaft has an arc-shaped protrusion, which is used for the bearing to be installed on one side of the sliding part.

[0016] As a preferred technical solution of this application, the side of the transmission gear is provided with a set of mounting grooves in an annular shape at equal intervals. The mounting grooves are connected to the inner wall and side of the transmission gear. The locking block is slidably installed in the mounting groove and an elastic element is installed between its inner end and the groove wall of the mounting groove. The side of the transmission gear is provided with a side plate covering the mounting groove.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: In the scheme of this application: This application features a receiving groove on the lifting shaft of the drilling rig, with the operating lever and handle slidably positioned within it. In automatic feed mode, the chuck is located within the linear slot, and a drive unit rotates the transmission gear, which in turn drives the lifting shaft to rotate via the chuck, achieving automatic feed. The operating lever and handle are isolated from the outside environment within the receiving groove, preventing accidental manual operation and improving the practicality and safety of the drilling rig. In manual feed mode, pulling the handle moves the operating lever outward, causing the transmission block to push the chuck out of the linear slot. The chuck does not obstruct the rotation of the lifting shaft, allowing manual feed by manually rotating the handle to synchronize the rotation of the operating lever and the lifting shaft. This provides quick and convenient operation. Attached Figure Description

[0018] Figure 1A schematic diagram of the overall structure of the drilling rig with the manual and automatic feed switching mechanism provided in this application; Figure 2 A schematic diagram of the automatic feed mode of the manual and automatic feed switching mechanism provided in this application; Figure 3 A schematic diagram of the manual feed mode of the manual and automatic feed switching mechanism provided in this application; Figure 4 A schematic diagram of the connection between the lifting shaft and the sliding part of the manual and automatic feed switching mechanism provided in this application; Figure 5 A schematic diagram of the automatic feed mechanism for the manual and automatic feed switching mechanism provided in this application; Figure 6 A schematic diagram of the transmission gears and lifting shaft of the manual and automatic feed switching mechanism provided in this application; Figure 7 A schematic diagram of the operating lever and lifting shaft of the manual and automatic feed switching mechanism provided in this application; Figure 8 This is a schematic diagram of the end cap structure of the manual and automatic feed switching mechanism provided in this application.

[0019] The image shows: 100. Drilling rig; 101. Drilling mechanism; 102. Sliding part; 103. Mounting part; 104. End cover; 105. Rotating block; 200. Lifting shaft; 201. Lifting gear; 202. Receiving groove; 203. Linear slot; 204. Arc-shaped protrusion; 300. Automatic feed mechanism; 301. Transmission gear; 302. Drive component; 303. Locking block; 304. Worm gear; 305. Third inclined plane; 306. Mounting slot; 307. Elastic component; 308. Side plate; 400. Manual feed mechanism; 401. Operating lever; 402. Transmission block; 403. First inclined plane; 404. Second inclined plane; 405. Connecting block; 406. Handle; 407. Through hole; 408. Annular protrusion. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0021] The present invention will be further described below with reference to embodiments.

[0022] Example: Refer to Figures 1 to 8 A manual and automatic feed switching mechanism includes a drill 100 and a drilling mechanism 101 installed on the outside of the drill 100. A lifting shaft 200 for controlling the vertical linear movement of the drilling mechanism 101 is installed in the middle of the drill 100. A lifting gear 201 is installed on the lifting shaft 200. The drilling mechanism 101 is vertically slidably installed on the side of the drill and is equipped with a gear rack (not shown in the figure) adapted to the lifting gear 201. A receiving groove 202 is opened at one end of the lifting shaft 200, and a linear slot 203 communicating with the receiving groove 202 is opened on the side of the lifting shaft 200. Furthermore, the drilling rig 100 is equipped with an automatic feed mechanism 300. The automatic feed mechanism 300 includes a transmission gear 301 rotatably mounted on the drilling rig 100 and coaxial with the lifting shaft 200, and a drive component 302 mounted on the drilling rig 100 and connected to the transmission gear 301. The transmission gear 301 and the lifting shaft 200 rotate independently. The drive component 302 is used to drive the transmission gear 301 to rotate in the automatic feed mode. The inner wall of the transmission gear 301 is elastically fitted with... A set of locking blocks 303 extend into the linear slot 203. The locking blocks 303 can be inserted into or separated from the linear slot 203. When the locking blocks 303 are inserted into the linear slot 203, the drive component 302 drives the transmission gear 301 to rotate. The transmission gear 301 drives the lifting shaft 200 to rotate through the locking blocks 303 to achieve automatic tool feeding, which is suitable for narrow, confined or other working environments where it is difficult for personnel to access or drill. When the locking blocks 303 are separated from the linear slot 203, the tool feeding is manually operated.

[0023] Furthermore, the drilling rig 100 is equipped with a manual feed mechanism 400. The manual feed mechanism 400 includes an operating rod 401 slidably installed in the receiving groove 202. The inner end of the operating rod 401 has a transmission block 402 that slides along the linear groove 203. When the transmission block 402 is below the locking block 303, it pushes the locking block 303 out of the linear groove 203. The locking block 303 does not block the rotation of the operating rod 401. At this time, the operating rod 401 is also outside the lifting shaft 200. By controlling the rotation of the operating rod 401, the transmission block 402 on the operating rod 401 drives the lifting shaft 200 to rotate by squeezing the linear groove 203, thereby driving the lifting gear 201 to rotate and achieve the purpose of manual feed.

[0024] The switching between manual feed and automatic feed modes is achieved by controlling whether the transmission block 402 and the locking block 303 are in contact. The structure is ingeniously designed and the operation is simple and convenient. Furthermore, such as Figures 1 to 3As shown, one end of the drilling rig 100 has a sliding part 102 for the drilling mechanism 101 to be raised and lowered. The lifting shaft 200 is installed on the top of the sliding part 102 and one end extends outside the sliding part 102. The lifting gear 201 is installed at the end of the lifting shaft 200 and is located in the middle of the sliding part 102. The side of the sliding part 102 has a mounting part 103 coaxial with the lifting shaft 200. The mounting part 103 is cylindrically fixed on the housing of the drilling rig 100. The transmission gear 301 is installed inside the mounting part 103. Correspondingly, the outer end of the lifting shaft 200 extends into the mounting part 103 to facilitate concealment and avoid accidental manual contact.

[0025] Furthermore, the transmission gear 301 is a worm gear, and the driving component 302 is a motor mounted on one side of the mounting portion 103. The side of the mounting portion 103 has a vertical and cylindrical connecting portion (such as...). Figure 1 As shown in the figure (not labeled), the motor is installed at the bottom of the mounting part 103 and the connecting part. The top of the connecting part is connected to the mounting part 103. The output end of the motor is equipped with a worm 304 that is adapted to and connected to the worm gear. The worm 304 is located inside the connecting part. Preferably, the driving component 302 is a servo motor or stepper motor that can rotate in both directions. It is electrically connected to the integrated operating system of the drilling rig 100 through built-in power lines and signal lines (not shown in the figure). The operating system is usually integrated in a convenient position on the drilling rig body 100 and includes at least a power switch, a mode selection switch, a feed speed controller, and an emergency stop button. Furthermore, an end cap 104 is detachably installed at the end of the mounting part 103. The end cap 104 seals and isolates the operating rod 401 housed in the receiving groove 202 to prevent accidental manual contact and to prevent the outer end of the operating rod 401 from being exposed and rotating with the lifting shaft 200 in automatic feed mode, which could cause scratches to workers who accidentally touch it. A rotating block 105 is rotatably installed in the middle of the end cap 104. When the operating rod 401 is in the receiving groove 202, its outer end slides against the rotating block 105. The rotating block 105 stably restricts the operating rod 401 in the receiving groove 202, and the rotating block 105 can rotate, reducing the friction between the operating rod 401 and the rotating block 105.

[0026] Furthermore, such as Figures 5 to 7As shown, the outer end of the transmission block 402 is located outside the lifting shaft 200 and opposite to the bottom of the locking block 303, which means that the locking block 303 can be pushed out of the linear slot 203 on the transmission shaft. The transmission block 402 has a first inclined surface 403 on the side facing the locking block 303. The distance from the bottom of the first inclined surface 403 to the axis of the lifting shaft 200 is less than the distance from the inner end of the locking block 303 to the axis of the lifting shaft 200. That is, when the transmission block 402 moves linearly along the linear slot 203 with the operating rod 401, it can push the elastically set locking block 303 vertically out of the linear slot 203 through the first inclined surface 403, so as to separate the locking block 303 from the lifting shaft 200. In this state, by manually operating the operating rod 401 to rotate, the locking block 303 slides and rotates relative to the transmission block 402 and the outer wall of the lifting shaft 200, so that the locking block 303 will not fall back into the linear slot 203, so that the manual feed can be carried out stably. Preferably, the outer end of the linear slot 203 is located outside the block 303. When the first inclined surface 403 abuts against the outer end of the linear slot 203, the block 303 is just pushed out of the linear slot 203 and contacts the outer end face of the transmission block 402. This makes it convenient for manual judgment as to whether the block 303 is separated from the linear slot 203. That is, when the operating lever 401 is no longer pulled outward, the operating lever 401 can be rotated to control the rotation of the lifting shaft 200, thus improving the convenience of operation.

[0027] Furthermore, the outer end of the transmission block 402 is provided with a second inclined surface 404 on both sides of the circumference of the lifting shaft 200, and the bottom end of the locking block 303 is provided with a third inclined surface 305 on both sides corresponding to the second inclined surface 404. In manual feed mode, as the transmission block 402 rotates with the lifting shaft 200, the second inclined surface 404 presses against the third inclined surface 305, causing the locking block 303 to retract. The locking block 303 can slide relative to the transmission block 402, and the transmission block 402 prevents the locking block 303 from entering the linear slot 203.

[0028] Furthermore, such as Figure 7 As shown, the outer end of the operating lever 401 has a pair of connecting blocks 405, and a handle 406 is rotatably mounted on the two connecting blocks 405. The handle 406 slides with the operating lever 401 into the receiving groove 202. The outer end of the handle 406 slides against the rotating block 105. When the handle 406 is pulled out of the receiving groove 202 by rotating it, it can be in a perpendicular state with the operating lever 401. Figure 3 As shown, it is easier for workers to hold the handle 406 to control the operation lever 401 and the rotation of the lifting shaft 200.

[0029] Furthermore, as shown in 7, the outer end of the handle 406 is provided with a through hole 407, which facilitates the hooking out of the handle 406 after the end cover 104 is opened. The inner ends of the operating rod 401 and the handle 406 are both provided with annular protrusions 408 that are adapted to and slidably connected to the receiving groove 202. The annular protrusions 408 ensure that the operating rod 401 and the handle 406 can move linearly along the receiving groove 202.

[0030] Furthermore, the outer side of the middle part of the lifting shaft 200 has an arc-shaped protrusion 204, which is used for the bearing to be installed on one side of the sliding part 102, so that the inner wall of the bearing is located on the outer side of the outer end of the transmission block 402, that is, to avoid the bearing blocking the transmission block 402 when it moves along the linear groove 203.

[0031] Furthermore, a set of mounting grooves 306 are provided in an annular shape on the side of the transmission gear 301. The mounting grooves 306 are connected to the inner wall and side of the transmission gear 301. The locking block 303 is slidably installed in the mounting groove 306, and an elastic element 307 is installed between its inner end and the groove wall of the mounting groove 306. A side plate 308 covering the mounting groove 306 is installed on the side of the transmission gear 301 to facilitate the disassembly and assembly of the locking block 303 and the elastic element 307.

[0032] The working principle of the manual and automatic feed switching mechanism provided in this application is as follows: In automatic feed mode, the handle 406 and the operating lever 401 are held in place by the rotating block 105 on the end cover 104. The handle 406 and the operating lever 401 are located in the receiving groove 202 of the lifting shaft 200 and isolated from the outside of the drilling machine 100. The driving component 302 drives the worm gear 304 to rotate. The worm gear 304 drives the transmission gear 301 (i.e., worm wheel) to rotate. The transmission gear 301 drives the lifting shaft 200 to rotate through the locking block 303 that engages with the linear slot 203. In turn, the drilling mechanism 101 is driven to rise and fall through the transmission of the lifting gear 201 located on the sliding part 102 of the lifting shaft 200. When it is necessary to switch to manual feed mode, open end cover 104 and pull out handle 406 and operating lever 401 until they stop moving. During this process, the first inclined surface 403 on transmission block 402 presses the corresponding locking block 303, causing it to retract into mounting groove 306 and separate from linear locking groove 203. The outer end of transmission block 402 contacts locking block 303. Then, manually rotate handle 406 to make operating lever 401 rotate. The rotation of operating lever 401 drives transmission block 402 to press linear locking groove 203, causing lifting shaft 200 and lifting gear 201 to rotate synchronously, thus achieving the purpose of manually controlling the lifting of drilling mechanism 101. When automatic feed is required, reset handle 406 and operating lever 401 and put end cover 104 back on.

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] Obviously, the embodiments described above are merely some embodiments of the present invention, not all embodiments. The accompanying drawings show preferred embodiments of the present invention, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms; rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this invention.

Claims

1. A manual and automatic feed switching mechanism, comprising a drill (100) and a drilling mechanism (101) mounted on the outside of the drill (100), wherein a lifting shaft (200) for controlling the vertical linear movement of the drilling mechanism (101) is mounted in the middle of the drill (100), and a lifting gear (201) is mounted on the lifting shaft (200), characterized in that, The lifting shaft (200) has a receiving groove (202) at one end, and a linear slot (203) communicating with the receiving groove (202) is provided on the side of the lifting shaft (200), and also includes: The automatic feed mechanism (300) includes a transmission gear (301) rotatably mounted on the drill (100) and coaxial with the lifting shaft (200), and a drive component (302) mounted on the drill (100) and connected to the transmission gear (301) in a transmission drive. The inner wall of the transmission gear (301) is elastically fitted with a set of locking blocks (303) that extend into the linear slot (203). The manual feed mechanism (400) includes an operating rod (401) slidably mounted in the receiving groove (202). The inner end of the operating rod (401) has a transmission block (402) that slides along the linear slot (203). When the transmission block (402) is below the slot (303), it pushes the slot (303) out of the linear slot (203).

2. The manual and automatic feed switching mechanism according to claim 1, characterized in that, The drilling rig (100) has a sliding part (102) at one end for the drilling mechanism (101) to be raised and lowered. The lifting shaft (200) is installed on the top of the sliding part (102) and one end extends outside the sliding part (102). The side of the sliding part (102) has a mounting part (103) coaxial with the lifting shaft (200). The transmission gear (301) is installed in the mounting part (103).

3. The manual and automatic feed switching mechanism according to claim 2, characterized in that, The transmission gear (301) is a worm gear, and the driving component (302) is a motor installed on one side of the mounting part (103). The output end of the motor is equipped with a worm (304) that is adapted to and connected to the worm gear.

4. The manual and automatic feed switching mechanism according to claim 3, characterized in that, An end cap (104) is installed at the end of the mounting part (103), and a rotating block (105) is rotatably installed in the middle of the end cap (104). When the operating rod (401) is located in the receiving groove (202), its outer end slides against the rotating block (105).

5. The manual and automatic feed switching mechanism according to claim 4, characterized in that, The outer end of the transmission block (402) is located outside the lifting shaft (200). The transmission block (402) has a first inclined surface (403) on the side facing the locking block (303). The distance from the bottom end of the first inclined surface (403) to the axis of the lifting shaft (200) is less than the distance from the inner end of the locking block (303) to the axis of the lifting shaft (200).

6. The manual and automatic feed switching mechanism according to claim 5, characterized in that, The outer end of the transmission block (402) is provided with a second inclined surface (404) on both sides of the circumference of the lifting shaft (200), and the bottom end of the clamping block (303) is provided with a third inclined surface (305) corresponding to the second inclined surface (404) on both sides.

7. The manual and automatic feed switching mechanism according to claim 6, characterized in that, The outer end of the operating lever (401) has a pair of connecting blocks (405), and a handle (406) is rotatably mounted on the two connecting blocks (405). The handle (406) slides in the receiving groove (202) along with the operating lever (401), and the outer end of the handle (406) slides against the rotating block (105).

8. The manual and automatic feed switching mechanism according to claim 7, characterized in that, The outer end of the handle (406) is provided with a through hole (407), and the inner end of the operating rod (401) and the handle (406) are both provided with annular protrusions (408) that are adapted to and slidably connected to the receiving groove (202).

9. A manual and automatic feed switching mechanism according to claim 8, characterized in that, The lifting shaft (200) has an arc-shaped protrusion (204) on the outer side of the middle, which is used for the bearing to be installed on one side of the sliding part (102).

10. A manual and automatic feed switching mechanism according to claim 9, characterized in that, The transmission gear (301) has a set of mounting grooves (306) arranged in an annular shape on its side. The mounting grooves (306) are connected to the inner wall and side of the transmission gear (301). The locking block (303) is slidably installed in the mounting groove (306) and an elastic element (307) is installed between its inner end and the groove wall of the mounting groove (306). The transmission gear (301) has a side plate (308) that covers the mounting groove (306) installed on its side.

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