Hose reel with damping

Abstract

The present application relates to a hose reel with damping, which comprises a hose reel body, the hose reel body is provided with an installation cavity, the installation cavity wall is provided with a winding disk, the winding disk is provided with a hose, the hose is wound around the winding disk, the side wall of the winding disk is provided with a reduction gear, the installation cavity wall is provided with a driven gear, the reduction gear chain is transmitted to the driven gear, the driven gear is coaxially provided with a reduction screw, the reduction screw comprises a screw section and a sliding section, the reduction screw is provided with a limit piece, the installation cavity wall is provided with a sliding rod, the installation cavity wall is provided with an elastic piece, the elastic force of the elastic piece limits the movement of the reduction block toward the sliding section, the present application reduces the rotation speed of the winding disk through the friction force of the movement of the reduction block, thereby reducing the winding speed of the hose after the hand is released, reducing the inconvenience caused by the rapid winding of the hose, and improving the overall safety of use.

Description

Technical Field

[0001] The present application relates to the field of hose reels, and in particular to a hose reel with damping recovery. Background Art

[0002] A hose reel is a device that winds a hose or wire around an axis. It is widely used in various production and assembly workshops, repair workshops, car beauty shops, auto 4S shops and other workplaces.

[0003] Referring to the Chinese utility model patent with patent number CN205222303U, a hose reel is disclosed, including a horizontally placed drum, a first vertically placed limiting plate is sleeved on the first end of the drum, a second vertically placed limiting plate is sleeved on the second end of the drum, a pressure plate is rotatably connected to the first end of the drum, a lock is rotatably connected to the lower side of the pressure plate, a locking hook is provided on the side wall of the first limiting plate, the position of the locking hook corresponds to the position of the locking buckle, and the locking buckle is tightly matched with the locking hook.

[0004] In actual use, the hose reel reels at a relatively fast speed during the hose pulling and reeling process, which may easily cause unnecessary personal injury and damage to the hose or cable, and needs to be improved. Summary of the invention

[0005] In order to reduce the speed of reeling the hose after it is stretched, the present application provides a hose reel with damping.

[0006] The present application provides a damping recovery hose reel, which adopts the following technical solution:

[0007] A hose reel with damping recovery comprises a hose reel body, the hose reel body is provided with an installation cavity, the cavity wall of the installation cavity is provided with a winding disk, the winding disk is provided with a hose, the winding disk is for the hose to be wound, the hose reel body is provided with a stretching port, the stretching port is connected to the installation cavity, the stretching port is for the hose to pass through, a reduction gear is provided on the side wall of the winding disk, the cavity wall of the installation cavity is provided with a driven gear, the reduction gear chain is driven by the driven gear, the driven gear is coaxially provided with a reduction screw, the reduction screw comprises a screw section and a sliding section, the reduction screw is provided with a limiter, the limiter moves along the axis direction of the reduction screw, the cavity wall of the installation cavity is provided with a sliding rod, the limiter slides on the sliding rod; the cavity wall of the installation cavity is provided with an elastic member, the elastic force of the elastic member limits the reduction block to move toward the sliding section; when the winding disk is wound, the reduction screw rotates to make the limiter move to the sliding section, the elastic member is in a compressed state, and the limiter slows down the winding speed of the hose.

[0008] By adopting the above technical solution, a deceleration screw is provided, and the deceleration screw is driven to rotate by the rotation of the winding disk. When the staff stops pulling the winding disk and lets go, the winding disk rotates to reel up the hose. The rotation of the winding disk drives the deceleration gear to rotate, thereby transmitting the power to the driven gear and causing the deceleration screw to rotate. At this time, the limit member moves toward the wall of the installation cavity away from the side where the elastic member is provided. During the rotation of the winding disk, the friction force of the movement of the limit member serves to reduce the rotation speed of the winding disk, thereby reducing the winding speed of the hose after letting go, reducing the inconvenience caused by the rapid winding of the hose, and improving the overall safety of use. In the case where the staff accidentally lets go, it is also convenient for the staff to react and re-hold the hose, thereby improving the fault tolerance of use and facilitating the use of workers.

[0009] Optionally, the limit member includes a deceleration block and a deceleration magnetic plate 2, the deceleration block moves along the axial direction of the deceleration screw, and the deceleration magnetic plate 2 is located on the side of the deceleration block close to the elastic member; the elastic member is connected with a deceleration magnetic plate 1, and the deceleration magnetic plate 1 slides on the deceleration screw, and the magnetic force of the deceleration magnetic plate 1 and the magnetic force of the deceleration magnetic plate 2 attract each other, and the deceleration magnetic plate 1 slides in the sliding section, and when the deceleration screw rotates and the deceleration magnetic plate 1 is located in the screw section, the rotation of the deceleration screw drives the deceleration magnetic plate 1 to move; when the deceleration screw rotates and the deceleration magnetic plate 1 is located in the sliding section, the rotation of the deceleration screw causes the deceleration magnetic plate 1 to remain in the sliding section.

[0010] By adopting the above technical solution, deceleration magnetic plate 1 and deceleration magnetic plate 2 are set. When the staff pulls the hose, the reel rotates. At this time, the rotation of the reel drives the deceleration screw to rotate and moves the deceleration block. The staff needs to provide additional force to move the deceleration block. When the deceleration block moves to the sliding section, the pulling force provided by the staff is used to drive the reel to rotate and thus stretch the hose, making it more convenient for the staff to pull the hose. At this time, deceleration magnetic plate 1 and deceleration magnetic plate 2 are adsorbed; when the hose is reeled, the magnetic force of deceleration magnetic plate 1 and deceleration magnetic plate 2 limits the deceleration block from moving in the direction of the threaded section, thereby reducing the reeling speed of the hose after it is released, and reducing the inconvenience caused by the rapid reeling of the hose.

[0011] Optionally, the elastic member is a deceleration spring, and the elastic force of the deceleration spring limits the movement of the deceleration magnetic plate 2 in a direction away from the deceleration magnetic plate 1; when the deceleration block detaches from the screw section and moves to the sliding section, the deceleration spring is in a compressed state.

[0012] By adopting the above technical solution, a deceleration spring is provided, and when the deceleration block moves to the sliding section, the elastic force of the deceleration spring causes the deceleration block to move toward the direction close to the threaded end, and the rotation of the deceleration screw and the elastic force of the deceleration spring act together on the deceleration block. When the hose is reeled up, the elastic force of the deceleration spring causes the deceleration block to move to the threaded end, and then the deceleration spring stretches and limits the movement of the deceleration block, thereby reducing the rotation of the deceleration screw, thereby indirectly reducing the rotation speed of the reel, and reducing the situation where the hose is quickly reeled up when the hand is released.

[0013] Optionally, a limiting ratchet is coaxially provided on the winding disk, and the limiting ratchet includes a smooth portion and a tooth portion. The wall of the mounting cavity is provided with a limiting ratchet, and the limiting ratchet rotates on the wall of the mounting cavity. The limiting ratchet is used to abut against the tooth portion and limit the rotation of the limiting ratchet; when the hose stops stretching and the limiting ratchet abuts against the tooth portion, the limiting ratchet limits the rotation of the limiting ratchet; when the hose stops stretching and the limiting ratchet does not abut against the tooth portion, the hose is reeled up and drives the limiting ratchet to rotate.

[0014] By adopting the above technical scheme, in actual use, there is a situation where the winding drum needs to be fixed in the required position, so a limit ratchet and a limit ratchet are set, and when the hose stops stretching and the limit ratchet contacts the limit ratchet, at this time, since the winding drum has not moved, the friction between the limit ratchet and the limit ratchet limits the rotation of the winding drum; when the hose stops stretching and the limit ratchet does not contact the limit ratchet, the hose reel body causes the winding drum to rotate, and the rotation of the winding drum drives the limit ratchet to rotate, and during the rotation of the limit ratchet, the limit ratchet contacts the limit ratchet, and since the limit ratchet has an initial rotation speed, the contact friction of the limit ratchet is difficult to limit the rotation of the limit ratchet, so the winding tube continues to be wound, and through this kind of design, it is convenient to control the hose to be in a stretched state according to the actual use of the hose reel body, which is convenient for the use of the staff.

[0015] Optionally, the wall of the installation cavity is provided with a limit rod, and two limit rods are provided. A limit channel is formed between two adjacent limit rods, and the limit channel is for a hose to pass through. The hose is provided with a positioning block, and the size of the positioning block is larger than the spacing between the two adjacent limit rods. The positioning block is used to resist the limit rod.

[0016] By adopting the above technical solution, a limit rod is set, and through the cooperation between the limit rod and the positioning block, the hose at one end of the positioning block away from the hose reel body is located outside the installation cavity, thereby facilitating the staff to pull the hose and reducing the situation where the end of the hose is accidentally inserted into the installation cavity, which is convenient for the staff to use.

[0017] Optionally, the hose reel body includes a shell 1 and a shell 2, the shell 1 is provided with an extension ridge, the extension ridge is located at one end of the shell 1 close to the shell 2, and the shell 2 is provided with a limiting ridge, the limiting ridge is used to abut against the inner side of the extension ridge.

[0018] By adopting the above technical solution, the shell one and the shell two are provided, and the shell one and the shell two are spliced ​​to form the outer shell of the hose reel body, which facilitates the assembly and disassembly of the components.

[0019] Optionally, the deceleration screw is located on the side of the installation cavity wall close to the stretching port, and a deceleration channel is formed between the sliding rod and the deceleration screw, and the deceleration channel is for the hose to pass through; the limiting member includes a deceleration block, which slides on the sliding rod, and the deceleration block is threadedly connected to the threaded section and slides on the sliding section; when the winding reel reels the hose, the deceleration screw rotates to move the deceleration block to the sliding section, and the deceleration block and the installation cavity wall clamp the hose together.

[0020] By adopting the above technical solution, when the hose is being wound up, the rotation of the winding disk indirectly drives the rotation of the deceleration screw, and the rotation of the deceleration screw causes the deceleration block to move in the direction close to the elastic member. At this time, the deceleration block continuously compresses the spacing of the deceleration channel. When the deceleration block moves the sliding section, the deceleration block presses against the hose, and the hose is clamped by the deceleration block and the wall of the installation cavity, thereby reducing the winding speed of the hose and reducing the situation where the hose is quickly wound up when the hand is released.

[0021] In summary, the present application includes at least one of the following beneficial technical effects:

[0022] 1. The deceleration screw is set, and the friction of the limiter movement plays a role in reducing the rotation speed of the reel, thereby reducing the reeling speed after the hose is released, reducing the inconvenience caused by the rapid reeling of the hose, and improving the overall safety of use. In the case of accidental release of the hose by the staff, it is also convenient for the staff to react and re-hold the hose, which improves the fault tolerance of use and is convenient for workers to use;

[0023] 2. Set up deceleration magnetic plate 1 and deceleration magnetic plate 2. When the staff pulls the hose, the reel rotates. At this time, the rotation of the reel drives the deceleration screw to rotate and moves the deceleration block. The staff needs to provide additional force to move the deceleration block. When the deceleration block moves to the sliding section, the pulling force provided by the staff is used to drive the reel to rotate and stretch the hose, making it more convenient for the staff to pull the hose. At this time, the deceleration magnetic plate 1 and the deceleration magnetic plate 2 are adsorbed; when the hose is reeled, the magnetic force of the deceleration magnetic plate 1 and the deceleration magnetic plate 2 limits the deceleration block from moving in the direction of the threaded section, thereby reducing the reeling speed of the hose after the hand is released, reducing the inconvenience caused by the rapid reeling of the hose;

[0024] 3. The limiter is set as a deceleration block. The rotation of the winding disk indirectly drives the deceleration screw to rotate. The rotation of the deceleration screw causes the deceleration block to move in the direction close to the elastic member. At this time, the deceleration block continuously compresses the spacing of the deceleration channel. When the deceleration block moves the sliding section, the deceleration block presses against the hose, and the hose is clamped by the deceleration block and the wall of the installation cavity, thereby reducing the winding speed of the hose and reducing the situation where the hose is quickly wound when it is released. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is an overall schematic diagram of Example 1.

[0026] Figure 2 It is a partial schematic diagram of Example 1, mainly showing the limiting ratchet.

[0027] Figure 3 It is a partial cross-sectional schematic diagram of Example 1, mainly showing the reduction screw.

[0028] Figure 4 It is a partial cross-sectional schematic diagram of Example 1, mainly showing the extended convex strips.

[0029] Figure 5 is a partial cross-sectional schematic diagram of Example 2,

[0030] Explanation of the accompanying drawings: 1. Hose reel body; 2. Shell 1; 3. Shell 2; 4. Extended convex strip; 5. Limiting convex strip; 6. Installation cavity; 7. Stretching port; 8. Reel; 9. Hose; 10. Limiting rod; 11. Limiting channel; 12. Limiting ratchet; 13. Limiting ratchet; 14. Smooth portion; 15. Tooth portion; 16. Positioning block; 17. Reduction gear; 18. Driven gear; 19. Reduction screw; 191. Threaded section; 192. Sliding section; 20. Sliding rod; 21. Elastic member; 22. Reduction spring; 23. Reduction magnetic plate 1; 24. Reduction magnetic plate 2; 25. Reduction block; 26. Reduction channel; 27. Limiting member. DETAILED DESCRIPTION

[0031] The present application is further described in detail below with reference to the accompanying drawings and embodiments.

[0032] The present application discloses a damping recovery hose reel. Figures 1 to 4 , including a hose reel body 1, the hose reel body 1 includes a shell 1 2 and a shell 2 3, the shell 1 2 is provided with an extension ridge 4, the extension ridge 4 is located at one end of the shell 1 2 close to the shell 2 3, the shell 2 3 is provided with a limiting ridge 5, the limiting ridge 5 is used to resist the inner side of the extension ridge 4.

[0033] The hose reel body 1 is provided with an installation cavity 6 and a stretching port 7, and the stretching port 7 is connected to the installation cavity 6. The wall of the installation cavity 6 is provided with a reel 8, and the reel 8 is provided with a hose 9, and the hose 9 is wound around the reel 8. In actual use, the hose reel body 1 is provided with a coil spring, and the coil spring generates torque through its elasticity. When an external force pulls the hose 9 to rotate the reel 8, the coil spring stores the torque. When the external force disappears, the coil spring uses the torque to drive the reel 8 to rotate and reel the hose 9.

[0034] A limit rod 10 is provided on the wall of the installation cavity 6, and the limit rod 10 is located on one side of the wall of the installation cavity 6 close to the telescopic opening. Two limit rods 10 are provided, and a limit channel 11 is formed between two adjacent limit rods 10. The limit channel 11 is for the hose 9 to pass through. The hose 9 is provided with a positioning block 16. The size of the positioning block 16 is greater than the spacing between the two adjacent limit rods 10, and the positioning block 16 is used to resist the limit rod 10.

[0035] The winding disk 8 is coaxially provided with a limit ratchet 12, and the rotation of the winding disk 8 drives the limit ratchet 12 to rotate, and the limit ratchet 12 includes a smooth portion 14 and a tooth portion 15. The cavity wall of the installation cavity 6 is provided with a limit ratchet 13, and the limit ratchet 13 rotates on the cavity wall of the installation cavity 6. The limit ratchet 12 and the limit ratchet 13 are not completely matched. When the limit ratchet 12 has an initial rotation speed, the limit ratchet 13 abuts against the tooth portion 15 of the limit ratchet 12 and cannot limit the rotation of the limit ratchet 12. The limit ratchet 13 is used to abut against the tooth portion 15 and limit the rotation of the limit ratchet 12 when the limit ratchet 12 does not have an initial rotation speed.

[0036] When the hose 9 stops stretching and the limit ratchet 13 hits the tooth portion 15, the limit ratchet 13 limits the limit ratchet 12 from rotating; when the hose 9 stops stretching and the limit ratchet 13 does not hit the tooth portion 15, the hose 9 is wound up to rotate the reel 8, and the rotation of the reel 8 drives the limit ratchet 12 to rotate, and then when the limit ratchet 13 hits the tooth portion 15, the limit ratchet 13 rotates and the tooth portion 15 pushes the limit ratchet 13 to rotate, and the hose 9 is wound up.

[0037] A reduction gear 17 is coaxially arranged on the side wall of the winding disk 8. The rotation of the winding disk 8 drives the reduction gear 17 to rotate. A driven gear 18 is arranged on the wall of the installation cavity 6. The reduction gear 17 is chain-driven to the driven gear 18. The diameter of the reduction gear 17 is larger than the diameter of the driven gear 18. A reduction screw 19 is coaxially arranged on the driven gear 18. The reduction screw 19 includes a threaded section 191 and a sliding section 192. The threaded section 191 is located on the side of the sliding section 192 close to the driven gear 18. The threaded section 191 is threadedly connected to a limit member 27. The limit member 27 slides on the sliding section 192. A sliding rod 20 is arranged on the wall of the installation cavity 6. The limit member 27 slides on the sliding rod 20. The sliding rod 20 is used to limit the rotation of the limit member 27.

[0038] In this embodiment, the limiting member 27 includes a deceleration block 25 and a deceleration magnetic plate 24. The deceleration block 25 is threadedly connected to the sliding section 192. The deceleration block 25 slides on the sliding section 192. The deceleration magnetic plate 24 is located at one end of the deceleration block 25 close to the elastic member 21. The wall of the mounting cavity 6 is provided with an elastic member 21. The elastic member 21 is connected with a deceleration magnetic plate 1 23. The deceleration magnetic plate 1 23 is located at one end of the elastic member 21 close to the deceleration block 25. The deceleration magnetic plate 1 23 slides on the sliding section 192. The magnetic force of the deceleration magnetic plate 1 23 and the magnetic force of the deceleration magnetic plate 2 24 attract each other. The elastic force of the elastic member 21 limits the deceleration magnetic plate 1 23 from moving in the direction close to the driven gear 18. In the present application, the elastic member 21 is a deceleration spring 22. Alternatively, the elastic member 21 can be a silicone plate.

[0039] When the deceleration screw 19 rotates and the deceleration magnetic plate 23 is located in the screw section, the rotation of the deceleration screw 19 drives the deceleration magnetic plate 23 to move away from the driven gear 18. When the deceleration screw 19 rotates and the deceleration magnetic plate 23 is located in the sliding section 192, the rotation of the deceleration screw 19 keeps the deceleration magnetic plate 23 in the sliding section 192, and the deceleration spring 22 is in a compressed state.

[0040] The implementation principle of a damped hose reel in Example 1 of the present application is as follows: in actual use, the user pulls the hose 9 to rotate the reel 8, and the rotation of the reel 8 drives the reduction gear 17 to rotate, and the driven gear 18 connected to the reduction gear 17 rotates. The driven gear 18 rotates and drives the reduction screw 19 to rotate. At this time, the reduction block 25 located in the threaded section 191 moves in a direction away from the driven gear 18. When the reduction block 25 moves to the position of the threaded section 191 close to the sliding section 192, the reduction magnetic plate 1 23 is adsorbed with the reduction magnetic plate 2 24. As the reel 8 continues to rotate, the reduction block 25 moves to the sliding section 192, and the reduction spring 22 is in a compressed state.

[0041] When the user releases the hose 9, the coil spring inside the hose reel body 1 causes the reel 8 to rotate and reel the hose 9. At this time, if the limit ratchet 13 abuts against the tooth portion 15, the limit ratchet 13 limits the limit ratchet 12 from rotating, and the hose 9 remains in a stretched state. If the limit ratchet 13 does not abut against the tooth portion 15, the reel 8 rotates to drive the reduction gear 17 to rotate, and the reduction screw 19 rotates through the driven gear 18. At this time, the elastic force of the reduction spring 22 causes the reduction block 25 to move toward the direction close to the driven gear 18. When the reduction block 25 moves to the threaded section 191 and continues to move, the elastic force of the reduction spring 22 limits the reduction block 25 from moving toward the direction close to the driven gear 18, thereby cooperating with the movement of the reduction block 25 to reduce the reeling speed of the hose 9.

[0042] Embodiment 2:

[0043] Reference Figure 5 The difference between this embodiment and embodiment 1 is that: the deceleration screw 19 is located on the side of the cavity wall of the installation cavity 6 close to the stretching port 7, and a deceleration channel 26 is formed between the sliding rod 20 and the deceleration screw 19, and the deceleration channel 26 is for the hose 9 to pass through; the limit member 27 includes a deceleration block 25.

[0044] The deceleration block 25 slides on the sliding rod 20, the deceleration block 25 is threadedly connected to the threaded section 191, and slides on the sliding section 192, and the hose 9 is located between the deceleration block 25 and the wall of the installation cavity 6. When the reel 8 reels the hose 9, the deceleration screw 19 rotates to move the deceleration block 25 to the sliding section 192, and the deceleration block 25 and the wall of the installation cavity 6 clamp the hose 9 together.

[0045] The implementation principle of a damping hose reel of Example 2 of the present application is as follows: when the reel 8 reels the hose 9, the reel 8 rotates to drive the reduction gear 17 to rotate, and the driven gear 18 connected to the reduction gear 17 rotates. The driven gear 18 rotates to drive the reduction screw 19 to rotate, and at this time, the reduction block 25 located at the threaded section 191 moves in a direction away from the driven gear 18. When the reduction block 25 moves in a direction close to the elastic member 21, the reduction block 25 and the wall of the installation cavity 6 clamp the hose 9, thereby reducing the reeling speed of the hose 9.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A hose reel with damping, comprising a hose reel body (1), characterized in that: The hose reel body (1) is provided with an installation cavity (6), a reel (8) is provided on the cavity wall of the installation cavity (6), a hose (9) is provided on the reel (8), the hose (9) is wound around the reel (8), the hose reel body (1) is provided with a stretching opening (7), the stretching opening (7) is connected to the installation cavity (6), the hose (9) is passed through the stretching opening (7), a reduction gear (17) is provided on the side wall of the reel (8), and a driven gear (17) is provided on the cavity wall of the installation cavity (6). (18), the reduction gear (17) is chain-driven to the driven gear (18), the driven gear (18) is coaxially provided with a reduction screw (19), the reduction screw (19) comprises a screw section and a sliding section (192), the reduction screw (19) is provided with a limiter (27), the limiter (27) moves along the axis of the reduction screw (19), the cavity wall of the installation cavity (6) is provided with a sliding rod (20), the limiter (27) slides on the sliding rod (20); The limiting member (27) comprises a deceleration block (25), the deceleration block (25) slides on the sliding rod (20), the deceleration block (25) is threadedly connected to the threaded section (191), and slides on the sliding section (192); an elastic member (21) is provided on the cavity wall of the installation cavity (6), and the elastic force of the elastic member (21) limits the deceleration block (25) from moving toward the sliding section (192); when the winding disk (8) is wound, the deceleration screw (19) rotates to move the limiting member (27) to the sliding section (192), the elastic member (21) is in a compressed state, and the limiting member (27) slows down the winding speed of the hose (9); The deceleration screw (19) is located on a side of the wall of the installation cavity (6) close to the stretching port (7), and a deceleration channel (26) is formed between the sliding rod (20) and the deceleration screw (19), and the deceleration channel (26) is for the hose (9) to pass through; When the reel (8) reels the hose (9), the deceleration screw (19) rotates so that the deceleration block (25) moves to the sliding section (192), and the deceleration block (25) and the wall of the installation cavity (6) clamp the hose (9) together.

2. The damping recovery hose reel according to claim 1, characterized in that: The winding disk (8) is coaxially provided with a limit ratchet (12), the limit ratchet (12) comprising a smooth portion (14) and a tooth portion (15), the cavity wall of the installation cavity (6) is provided with a limit ratchet (13), the limit ratchet (13) rotates on the cavity wall of the installation cavity (6), and the limit ratchet (13) is used to abut against the tooth portion (15) and limit the rotation of the limit ratchet (12); When the hose (9) stops stretching and the limiting ratchet (13) abuts against the tooth portion (15), the limiting ratchet (13) limits the rotation of the limiting ratchet (12); when the hose (9) stops stretching and the limiting ratchet (13) does not abut against the tooth portion (15), the hose (9) is rolled up and drives the limiting ratchet (12) to rotate.

3. The damping recovery hose reel according to claim 2, characterized in that: The wall of the installation cavity (6) is provided with a limiting rod (10), two limiting rods (10) are provided, a limiting channel (11) is formed between two adjacent limiting rods (10), the limiting channel (11) is for the hose (9) to pass through, the hose (9) is provided with a positioning block (16), the size of the positioning block (16) is greater than the distance between the two adjacent limiting rods (10), and the positioning block (16) is used to abut against the limiting rod (10).

4. The damping recovery hose reel according to claim 1, characterized in that: The hose reel body (1) comprises a shell body 1 (2) and a shell body 2 (3); the shell body 1 (2) is provided with an extension ridge (4); the extension ridge (4) is located at one end of the shell body 1 (2) close to the shell body 2 (3); the shell body 2 (3) is provided with a limiting ridge (5); the limiting ridge (5) is used to abut against the inner side of the extension ridge (4).

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