A quick-change type pin-type insulator convenient to maintain

Abstract

This invention relates to the field of power insulators, specifically to a quick-replacement snap-on insulator that is easy to maintain, comprising an insulator and a cable. The invention utilizes a modular design with two fixed frames (Frame 1 and Frame 2) to divide the insulator's load-bearing structure into independent units. During replacement, the new insulator can be pre-connected to the connecting cylinder of Frame 1 and the snap-on hook of Frame 2, eliminating the need for additional clamps to pre-fix the conductor. The cable tension allows the inclined slide groove to slide along the connecting rod, adjusting the stress point and seamlessly replacing the old and new insulators. This significantly reduces the difficulty and risk of high-altitude operations and shortens operating costs. Simultaneously, through the linkage between the snap-on hook and the trapezoidal cylinder locking rod, when the insulator bears tension, the trapezoidal cylinder and the inner wall of the internally threaded cylinder compress the sphere into the slot for quick locking. The stronger the tension, the greater the locking force, forming a self-locking mechanism. Disassembly allows for quick removal of the old insulator by loosening the internally threaded cylinder, significantly improving connection stability and maintenance convenience.

Description

Technical Field

[0001] This invention relates to the field of electrical insulators, and more specifically to a quick-replaceable snap-on insulator that is easy to maintain. Background Technology

[0002] An insulator is an insulating control installed between conductors at different potentials, or between a conductor and a grounding component. Its core function is electrical insulation and mechanical support, while also withstanding voltage and mechanical force.

[0003] In the invention patent application CN223006619U, published on June 20, 2025, entitled "An Insulator with Demountable and Replaceable Components," this invention discloses an insulator with demountable and replaceable components. This utility model includes an insulator body, several connecting skirts detachably connected to the insulator body, and several extended arc edge groups arranged circumferentially along the connecting skirts. The insulator body has annular connecting bodies arranged at equal intervals along its height direction. A connecting groove is formed on the bottom of the inner side of each annular connecting body along its circumference. Connecting buckles are correspondingly provided on the outer side of each connecting skirt at positions corresponding to the connecting grooves. A connecting ring groove is also formed on the bottom edge of the outer side of each connecting skirt. Each extended arc edge group includes several connecting arc edges with their edges interlocking. The purpose of this utility model is to provide an insulator with demountable and replaceable components, which solves the problems of existing insulators having fixed skirt sizes and creepage distances, requiring increased creepage distances, making disassembly and assembly cumbersome, and exposing the connection gap between the insulator and the skirts.

[0004] In existing insulators, including those mentioned above, damaged or deteriorated parts need to be replaced periodically during service. Because insulators must continuously bear the tension of the conductor, traditional replacement methods require pre-fixing the conductor with clamps and relieving the tension on the insulator string before replacement, a highly cumbersome process. Furthermore, existing insulators and conductors are mostly connected using clamps, which significantly increases the difficulty of insulator replacement and maintenance in high-altitude work scenarios, making convenient disassembly and assembly impossible.

[0005] Therefore, it is necessary to invent a quick-replaceable snap-on insulator that is easy to maintain to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a quick-replaceable snap-on insulator that is easy to maintain. By setting up a modular fixed frame 1 and fixed frame 2 split bearing structure, a force adjustment component with inclined sliding groove, a snap-on hook quick connection structure, and a tension-triggered ball self-locking mechanism, this invention solves the problems in the prior art where insulator replacement requires the use of special clamps to pre-tighten and unload the conductor, the operation process is cumbersome and complicated, and the existing clamp-fixed connection method is difficult to disassemble and assemble in high-altitude operation scenarios, which is not conducive to convenient maintenance.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a quick-replaceable snap-on insulator that is easy to maintain, comprising an insulator and a cable, wherein a fixing frame one is provided on one side of the insulator, a fixing frame two is provided on the side of the insulator away from the fixing frame one, and the cable is located on the side of the fixing frame two away from the insulator.

[0008] The replacement component set in the fixed frame one and fixed frame two includes an inclined slide groove. The inclined slide grooves are symmetrically opened on the surface of the fixed frame one. A connecting rod is connected through the two sets of inclined slide grooves. Fixing frames are symmetrically installed on both sides of the connecting rod, and the fixing frames are used to install the position of the fixed frame one.

[0009] The fixing components set on both sides of the insulator include a first buckle hook, which is symmetrically installed on the side of the insulator close to the first fixing frame. The second buckle hook is symmetrically rotatably connected to the upper and lower sides of the second fixing frame, and the lower second buckle hook is engaged with the insulator.

[0010] As a preferred embodiment of the present invention, the fixed frame has through holes symmetrically opened on one surface, and bolts are connected through the two sets of through holes at the bottom, and one end of each set of bolts is screwed to the surface of the connecting rod.

[0011] As a preferred embodiment of the present invention, a through groove is provided on the inner wall of the second fixed frame, and a fixed cylinder is rotatably connected to the inner wall of the second fixed frame, and the fixed cylinder is disposed through the inside of the through groove, and the fixed cylinder is fixedly connected to the cable.

[0012] As a preferred embodiment of the present invention, the fixed frame is symmetrically connected to the upper and lower rotating seats, and each of the two sets of rotating seats is equipped with a connecting cylinder on the side near the insulator, and the connecting cylinder and the corresponding buckle hook are arranged opposite to each other.

[0013] As a preferred embodiment of the present invention, the surface of the connecting cylinder is provided with four sets of fixing grooves arranged in a ring, and each set of fixing grooves is provided with a through hole.

[0014] As a preferred embodiment of the present invention, a connecting block is rotatably connected to the side of the insulator near the fixed frame, and a fixed rod is rotatably connected to one side of the connecting block, with the fixed rod being connected through the connecting cylinder.

[0015] As a preferred embodiment of the present invention, the surface of the fixing rod is provided with four sets of slots arranged in a ring, and the slots coincide with the positions of the corresponding through holes.

[0016] As a preferred embodiment of the present invention, each group of through holes is provided with a ball, and the ball is engaged with the corresponding slot. A trapezoidal cylinder is sleeved on the connecting cylinder, and the inner wall of the trapezoidal cylinder is in contact with each group of balls.

[0017] As a preferred embodiment of the present invention, the connecting cylinder is fitted with an internally threaded cylinder at its upper limit, and the internally threaded cylinder is screwed to the trapezoidal cylinder, and the inner wall of the internally threaded cylinder is in contact with the sphere.

[0018] As a preferred embodiment of the present invention, a snap-fit ​​rod is symmetrically installed on one side of the trapezoidal cylinder, and the snap-fit ​​rod is snapped into the corresponding snap-fit ​​hook.

[0019] Compared with the prior art, the technical effects and advantages provided by the present invention in the above technical solution are as follows:

[0020] 1. By using a modular design that connects the poles and towers to the fixed frame 1 and the cables to the fixed frame 2, the load-bearing and connection structure of the insulator is divided into independent functional units. During the insulator replacement operation, the new insulator can be pre-connected to the connecting cylinder of the fixed frame 1 and the buckle hook 2 of the fixed frame 2. There is no need to use additional special clamps to pre-fix the conductor. Then, by the tension of the cable itself, the inclined slide groove slides along the connecting rod. By adjusting the stress points of the fixed frame 1 and the fixed frame 2, the seamless replacement of the old and new insulators can be completed. This completely eliminates the cumbersome steps of clamp pre-fixing, stress unloading, and step-by-step disassembly and assembly in the traditional replacement process. It greatly reduces the difficulty and safety risks of operation in confined spaces at high altitudes and effectively shortens the time and labor costs of the replacement operation.

[0021] 2. The insulator is linked to the snap hook at one end with the snap rod on the trapezoidal cylinder. When the insulator bears the tension of the conductor, the tension is simultaneously transmitted to the trapezoidal cylinder, causing the inner wall of the trapezoidal cylinder and the inner wall of the internal threaded cylinder to form a continuous radial compressive force on the ball, pushing the ball to firmly snap into the slot, thus achieving rapid locking of the insulator and the connecting cylinder. At the same time, this structure has a tensile self-adaptive reinforcement characteristic. The stronger the conductor tension carried by the insulator, the greater the compressive force of the trapezoidal cylinder on the ball, forming a self-locking effect. In addition, when disassembling, the old insulator can be quickly disassembled by loosening the internal threaded cylinder and the trapezoidal cylinder, which significantly improves the stability and convenience of the insulator connection. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the fixed frame structure of the present invention;

[0025] Figure 3This is a schematic diagram of the fixed frame two structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the fixed frame-cut structure of the present invention;

[0027] Figure 5 This is a schematic diagram of the planed structure of the connecting cylinder of the present invention;

[0028] Figure 6 This is a schematic diagram of the rotating seat structure of the present invention;

[0029] Figure 7 This is a schematic diagram of the fixing rod structure of the present invention;

[0030] Figure 8 This is a schematic diagram showing the disassembly structure of the trapezoidal cylinder and the internally threaded cylinder of the present invention;

[0031] Figure 9 This is a schematic diagram of the internal threaded cylinder planing structure of the present invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 001. Fixed frame one; 101. Fixed frame two; 102. Insulator; 103. Cable; 002. Replacement component; 201. Inclined slide groove; 202. Connecting rod; 203. Fixing bracket; 204. Through hole; 205. Bolt; 206. Through groove; 207. Fixing cylinder; 003. Fixing component; 301. Rotating seat; 302. Connecting cylinder; 303. Fixing groove; 304. Through hole; 305. Fixing rod; 306. Slot; 307. Sphere; 308. Trapezoidal cylinder; 309. Internally threaded cylinder; 310. Snap-fit ​​rod; 311. Snap-hook one; 312. Snap-hook two; 313. Connecting block. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] This invention provides, for example Figure 1-9 The present invention relates to a quick-replaceable snap-on insulator that is easy to maintain, comprising an insulator 102 and a cable 103. A fixing frame 101 is provided on one side of the insulator 102, and a fixing frame 201 is provided on the side of the insulator 102 away from the fixing frame 101. The cable 103 is located on the side of the fixing frame 201 away from the insulator 102.

[0036] By setting fixed frame 1001 and fixed frame 2101 on both sides of insulator 102, modular installation is formed at both ends of insulator 102. Fixed frame 2101 is connected to cable 103 and fixed frame 2101 is connected to tower, providing a structural foundation for the subsequent rapid replacement of insulator 102. At the same time, the modular layout facilitates the step-by-step implementation of subsequent disassembly and maintenance operations.

[0037] The replacement component 002, which is set in the first fixed frame 001 and the second fixed frame 101, includes an inclined slide 201. The inclined slide 201 is symmetrically opened on the surface of the first fixed frame 001. A connecting rod 202 is connected through the two sets of inclined slides 201. Fixing brackets 203 are symmetrically installed on both sides of the connecting rod 202. The fixing brackets 203 are used to install the position of the first fixed frame 001.

[0038] The inclined slide 201 can provide guidance for the connecting rod 202, and together with the fixing frame 203, it can fix the fixing frame 001 to the tower. In addition, the inclined slide 201 can change the stress point of the fixing frame 001 by guiding the sliding during the replacement of the insulator 102. This allows the insulator 102 to be replaced without the need for additional special clamps to pre-tighten and unload the conductor, greatly simplifying the replacement operation process and adapting to the convenient operation needs of high-altitude confined spaces.

[0039] The fixing components 003 located on both sides of the insulator 102 include a first buckle hook 311, which is symmetrically installed on the side of the insulator 102 near the first fixing frame 001. The second fixing frame 101 is symmetrically connected to the second buckle hook 312, and the lower buckle hook 312 is engaged with the insulator 102.

[0040] The connection between the first snap hook 311 and the second snap hook 312 at both ends of the insulator 102 enables the insulator 102 to be quickly snapped and fixed and disassembled. At the same time, the symmetrical snap hook 311 can evenly distribute the tension of the insulator 102.

[0041] Furthermore, in the above structure, through holes 204 are symmetrically opened on the surface of the fixed frame 001. Bolts 205 are connected through the two sets of through holes 204 at the bottom, and one end of each set of bolts 205 is screwed to the surface of the connecting rod 202.

[0042] By using the through hole 204 and the bolt 205, the connecting rod 202 can be adjusted to the target position along the inclined slide 201, and then screwed in and locked by the bolt 205 through the through hole 204, ensuring the structural stability of the fixed frame 001. At the same time, after the new insulator 102 is replaced, the bolt 205 is used to release the lock, thereby causing the fixed frame 001 to flip over, allowing the connecting rod 202 to slide to the corresponding position along the inclined slide 201, thus adjusting the stress point of the fixed frame 001 after the insulator 102 is replaced to the corresponding position.

[0043] Furthermore, in the above structure, a through groove 206 is provided on the inner wall of the second fixed frame 101, and a fixed cylinder 207 is rotatably connected to the inner wall of the second fixed frame 101. The fixed cylinder 207 is connected to the through groove 206 through the inside, and the fixed cylinder 207 is fixedly connected to the cable 103.

[0044] The through groove 206 provides space for the fixing cylinder 207, so that after the fixing cylinder 207 is fixedly connected to the cable 103, the tension of the cable 103 can be transmitted to the fixing frame 2 101. The rotation of the fixing cylinder 207 in the through groove 206 can ensure that after the replacement of the insulator 102, the stress points of the fixing frame 1 001 and the fixing frame 2 101 change. At this time, the fixing cylinder 207 can rotate to ensure the stability of the posture between the fixing frame 2 101 and the cable 103.

[0045] Furthermore, in the above structure, a rotating seat 301 is symmetrically rotatably connected inside the fixed frame 1 001. A connecting cylinder 302 is installed on the side of the two sets of rotating seats 301 near the insulator 102, and the connecting cylinder 302 and the corresponding buckle hook 2 312 are arranged opposite to each other.

[0046] By rotating the rotating seat 301 and the fixed frame 001, the insulator 102 can be adapted to different force directions after installation, avoiding stress concentration. At the same time, the symmetrically arranged connecting cylinder 302 and the corresponding buckle hook 312 can allow the new insulator 102 to be installed first and then the old one to be removed during the replacement process, thus eliminating the need for additional clamps.

[0047] Furthermore, in the above structure, the surface of the connecting cylinder 302 is provided with four sets of fixing grooves 303 arranged in a ring, and each set of fixing grooves 303 is provided with a through hole 304.

[0048] The annularly distributed fixing grooves 303 provide a spatial basis for subsequent locking, and together with the through holes 304, they form a radial locking channel. The annular structure can ensure uniform force during subsequent locking.

[0049] Furthermore, in the above structure, a connecting block 313 is rotatably connected to the side of the insulator 102 near the fixed frame 001, and a fixing rod 305 is rotatably connected to one side of the connecting block 313, and the fixing rod 305 is connected through the connecting cylinder 302.

[0050] By using the rotating structure of the connecting block 313 in conjunction with the rotation of the fixing rod 305, the fixing rod 305 can be adjusted at multiple angles. At the same time, after the position of the fixing rod 305 is confirmed, the insulator 102 can also be adjusted, so that the snap hook 311 can be adapted to different installation angles, thereby forming a cooperation with the snap rod 310.

[0051] Furthermore, in the above structure, the surface of the fixing rod 305 is provided with four sets of slots 306 arranged in a ring, and the slots 306 coincide with the corresponding through holes 304.

[0052] Furthermore, in the above structure, each group of through holes 304 is provided with a ball 307, and the ball 307 is engaged with the corresponding slot 306. A trapezoidal cylinder 308 is sleeved on the connecting cylinder 302, and the inner wall of the trapezoidal cylinder 308 is in contact with each group of balls 307.

[0053] By using the ball 307 as a locking actuator, and in conjunction with the compression of the inner wall of the trapezoidal cylinder 308, the connecting cylinder 302 and the fixing rod 305 can be quickly locked and unlocked. When the trapezoidal cylinder 308 moves axially along the connecting cylinder 302, the inner wall of the trapezoid will generate radial compression force on the ball 307, pushing the ball 307 to move along the through hole 304 into the slot 306, thereby achieving multi-point synchronous locking.

[0054] Furthermore, in the above structure, the connecting cylinder 302 is fitted with an internally threaded cylinder 309 at its upper limit, and the internally threaded cylinder 309 is screwed to the trapezoidal cylinder 308, and the inner wall of the internally threaded cylinder 309 is in contact with the sphere 307.

[0055] The threaded engagement of the internal threaded cylinder 309 and the trapezoidal cylinder 308 enables the internal threaded cylinder 309 to drive the trapezoidal cylinder 308 to move axially along the connecting cylinder 302, ensuring the stability of the locking state. At the same time, the trapezoidal cylinder 308 can cause the trapezoidal surface to coincide with the ball 307 during the movement, thereby causing the ball 307 to disengage from the slot 306. Meanwhile, the compression of the ball 307 can ensure the self-locking property of the threaded engagement between the internal threaded cylinder 309 and the trapezoidal cylinder 308, and also ensure the positional stability of the internal threaded cylinder 309, preventing it from falling off the connecting cylinder 302.

[0056] Furthermore, in the above structure, a snap-fit ​​rod 310 is symmetrically installed on one side of the trapezoidal cylinder 308, and the snap-fit ​​rod 310 is snapped into the corresponding snap hook 311.

[0057] The engagement of the snap-fit ​​rod 310 and the snap-fit ​​hook 311 allows the radial tension of the insulator 102 to be transmitted to the trapezoidal cylinder 308, thereby causing the trapezoidal cylinder 308 and the internal threaded cylinder 309 to press against the ball 307, thus locking the fixing rod 305 and the connecting cylinder 302 and facilitating the quick replacement of the insulator 102.

[0058] like Figure 1-9 As shown, when insulator 102 needs to be replaced, trapezoidal cylinder 308 and internally threaded cylinder 309 are first pre-fitted onto connecting cylinder 302. Then, the snap hook 311 at one end of the new insulator 102 is initially engaged with the snap rod 310 on trapezoidal cylinder 308 to complete the pre-positioning. Next, fixing rod 305 is inserted into the connecting cylinder 302, and ball 307 is placed in the gap between fixing groove 303 and the inner wall of trapezoidal cylinder 308. At this time, ball 307 naturally falls between the surface of connecting cylinder 302 and the inner wall of trapezoidal cylinder 308.

[0059] By rotating the internally threaded cylinder 309, the trapezoidal cylinder 308 is driven to gradually move radially along the axial direction of the connecting cylinder 302 through its threaded engagement with the trapezoidal cylinder 308, thereby widening the gap between the inclined surface of the trapezoidal cylinder 308 and the fixed groove 303. In this state, the overall posture of the insulator 102 is adjusted by rotating the seat 301, so that the ball 307 accurately falls into the through hole 304 of the connecting cylinder 302.

[0060] Keeping the insulator 102 at the same tilt angle, the internal threaded cylinder 309 is rotated in the opposite direction, causing the trapezoidal cylinder 308 to move back, reducing the gap between it and the fixing groove 303. This causes the ball 307 to be firmly inserted into the groove 306 on the surface of the fixing rod 305, achieving multi-point radial locking between the connecting cylinder 302 and the fixing rod 305, and completing the stable connection of one end of the new insulator 102.

[0061] Then, attach the other end of the new insulator 102 to the clip hook 312 inside the fixing frame 101 to achieve bidirectional fixation at both ends. After the new insulator 102 is installed in place, rotate and loosen the internal threaded cylinder 309 on one side of the old insulator 102 to release the locking of the ball 307, and the old insulator 102 can be quickly disassembled.

[0062] Finally, bolt 205 is removed. Under the automatic drive of the tension of cable 103, fixing frame 2 101 rotates in the direction of force, and the new insulator 102 drives fixing frame 1 001 to rotate synchronously, so that the through groove 206 slides along the connecting rod 202 to the predetermined position. Tighten bolt 205 again, and lock the connecting rod 202 to fixing frame 1 001 through the new through hole 304, thus completing the entire replacement process.

[0063] This replacement method requires no external auxiliary clamps, the operation steps are simple and quick, and the dual fixing structure of ball 307 locking and buckle hooking significantly enhances the convenience and reliability of installation and maintenance.

[0064] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A quick-replaceable snap-on insulator for easy maintenance, comprising an insulator (102) and a cable (103), characterized in that: A fixing frame one (001) is provided on one side of the insulator (102), and a fixing frame two (101) is provided on the side of the insulator (102) away from the fixing frame one (001), and the cable (103) is located on the side of the fixing frame two (101) away from the insulator (102); The replacement component (002) set in the first fixed frame (001) and the second fixed frame (101) includes an inclined slide (201). The inclined slide (201) is symmetrically opened on the surface of the first fixed frame (001). A connecting rod (202) is connected through the two sets of inclined slides (201). Fixing brackets (203) are symmetrically installed on both sides of the connecting rod (202), and the fixing brackets (203) are used to install the position of the first fixed frame (001). The fixing components (003) set on both sides of the insulator (102) include a first buckle hook (311), which is symmetrically installed on the side of the insulator (102) near the first fixing frame (001). The second fixing frame (101) is symmetrically connected to the second buckle hook (312) in the upper and lower parts, and the lower buckle hook (312) is engaged with the insulator (102).

2. The easy-to-maintain, quick-replacement snap-on insulator according to claim 1, characterized in that: The fixed frame (001) has symmetrical through holes (204) on its upper and lower surfaces. Bolts (205) are connected through the two sets of through holes (204) on the lower surface, and one end of each set of bolts (205) is screwed to the surface of the connecting rod (202).

3. The easy-to-maintain, quick-replacement snap-on insulator according to claim 1, characterized in that: A through groove (206) is provided on the inner wall of the second fixed frame (101), and a fixed cylinder (207) is rotatably connected to the inner wall of the second fixed frame (101). The fixed cylinder (207) and the through groove (206) are connected through each other, and the fixed cylinder (207) is fixedly connected to the cable (103).

4. The easy-to-maintain, quick-replacement snap-on insulator according to claim 1, characterized in that: The fixed frame (001) is symmetrically connected to a rotating seat (301) in the upper and lower parts. Both sets of rotating seats (301) are equipped with connecting cylinders (302) on the side near the insulator (102), and the connecting cylinders (302) and the corresponding buckle hooks (312) are arranged opposite to each other.

5. A quick-replacement snap-on insulator for easy maintenance according to claim 4, characterized in that: The surface of the connecting cylinder (302) is provided with four sets of fixing grooves (303) arranged in a ring, and each set of fixing grooves (303) is provided with a through hole (304).

6. A quick-replacement snap-on insulator for easy maintenance according to claim 4, characterized in that: The insulator (102) is rotatably connected to a connecting block (313) on the side near the fixed frame (001), and a fixing rod (305) is rotatably connected to one side of the connecting block (313), and the fixing rod (305) is connected through the connecting cylinder (302).

7. A quick-replacement snap-on insulator for easy maintenance according to claim 6, characterized in that: The surface of the fixing rod (305) is provided with four sets of slots (306) arranged in a ring, and the slots (306) coincide with the corresponding through holes (304).

8. A quick-replacement snap-on insulator for easy maintenance according to claim 7, characterized in that: Each group of through holes (304) is provided with a ball (307), and the ball (307) is engaged with the corresponding slot (306). A trapezoidal cylinder (308) is sleeved on the connecting cylinder (302), and the inner wall of the trapezoidal cylinder (308) is in contact with each group of balls (307).

9. A quick-replacement snap-on insulator for easy maintenance according to claim 8, characterized in that: The connecting cylinder (302) is fitted with an internal threaded cylinder (309) at its upper limit, and the internal threaded cylinder (309) is screwed to the trapezoidal cylinder (308), and the inner wall of the internal threaded cylinder (309) is in contact with the sphere (307).

10. A quick-replaceable snap-on insulator for easy maintenance according to claim 9, characterized in that: The trapezoidal tube (308) is symmetrically equipped with a snap-fit ​​rod (310) on one side, and the snap-fit ​​rod (310) is snapped into the corresponding snap-fit ​​hook (311).

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