Drain valve convenient to disassemble

Abstract

The utility model provides a drain valve convenient to disassemble, which comprises a drain valve control valve body, a valve body connecting seat fixedly clamped at the bottom of the drain valve control valve body, a limit structure arranged on the drain valve control valve body, and a valve body connecting seat clamped at the bottom of the drain valve control valve body, and the sleeve structure is arranged on the valve body connecting seat. The connecting sleeve shell at the lower end of the valve body connecting seat and the sealing ring are connected into the closestool water tank connecting seat in a sleeved mode, then the threaded sleeve is screwed downwards on the valve body connecting seat, so that the clamping block is clamped into the clamping groove, and the valve body connecting seat can be better fixed into the closestool water tank under the condition that tools are not needed. By means of the limiting rod, the situation that the drainage sleeve ascends to leave the clamping block, the clamping block is separated from the clamping groove, and connection between the valve body connecting base and the closestool water tank connecting base is loosened is avoided, the drainage valve can be detached by rotating the threaded sleeve upwards, and the drainage valve is convenient to detach.

Description

Technical Field

[0001] The utility model relates to the field of sanitary ware, in particular to a drain valve that is convenient to disassemble. Background Art

[0002] A toilet, also known as a sitting toilet, is a kind of sanitary ware in the field of building water supply and drainage materials, with the function of being used for both urination and defecation and equipped with a lid. The toilet drain valve is an important part of the toilet, and its function is to control the drainage volume and drainage speed of the toilet. The principle of the toilet drain valve is to control the flow of water by opening and closing the valve, so as to realize the drainage function of the toilet.

[0003] Among the existing Chinese utility models, the publication number CN207608974U discloses a drain valve buckle structure for a toilet water tank, which includes a base, a drain valve main body, a valve plug, a water inlet pipe, a double-track fixing structure, a first track, a second track, a buckle, and a fixing lock; the base is connected to the water inlet pipe, a buckle is arranged on the bottom edge of the drain valve main body, and a double-track fixing structure is arranged on the upper edge of the base; the double-track fixing structure includes a first track and a second track, the first track is located at the upper edge position of the base, the second track is located below the first track, and the buckle fixes the base and the drain valve main body together by buckling the second track; a fixing lock is also arranged below the base; a valve plug is arranged inside the base. This structure is simple and easy to disassemble and assemble.

[0004] Referring to the above drain valve buckle structure for a toilet water tank, when the drain valve is connected to the toilet water tank, it is connected through a fixing lock. However, when connecting through a fixing lock, it usually requires tools such as a screwdriver to turn the fixing lock. In the absence of tools, it is not possible to install or disassemble the drain valve well, so that when the drain valve is installed and disassembled with the toilet water tank, it is relatively inconvenient. Therefore, how to facilitate the installation and disassembly of the drain valve without the need to rely on tools is an important problem to be solved in the design of a drain valve that is convenient to disassemble. Summary of the Utility Model

[0005] The utility model provides a drain valve that is convenient to disassemble in order to solve the problem of facilitating the installation and disassembly of the drain valve without the need to rely on tools.

[0006] The utility model solves the above technical problems through the following technical solutions:

[0007] The utility model provides a drain valve that is convenient to disassemble, which includes a drain valve control valve body, a valve body connecting seat is fixedly clamped at the bottom of the drain valve control valve body, and further includes:

[0008] A limiting structure, the limiting structure is arranged on the drain valve control valve body;

[0009] A sleeve structure, and the sleeve structure is arranged on the valve body connecting seat;

[0010] A clamping and fixing structure, and the clamping and fixing structure is arranged at the bottom of the valve body connecting seat;

[0011] A toilet tank connecting seat, and the toilet tank connecting seat is arranged on the clamping and fixing structure, and the clamping and fixing structure fixedly connects the valve body connecting seat to the toilet tank connecting seat.

[0012] Preferably, a clamping groove is formed on the inner side wall of the toilet tank connecting seat.

[0013] Preferably, the clamping and fixing structure includes a connecting sleeve housing, a fixing rod, a second spring, a sliding plate, a sealing ring, a clamping block and a second fixing ring plate. The connecting sleeve housing is fixedly connected to the bottom side wall of the valve body connecting seat. A fixing rod is fixedly connected to the inner side wall of the connecting sleeve housing. A sliding plate is fixedly connected to the side wall of the clamping block. The sliding plate is slidably connected to the fixing rod. The second spring is fixedly connected between the sliding plate and the inner side wall of the connecting sleeve housing. The second fixing ring plate is fixedly connected to the outer side wall of the connecting sleeve housing. The sealing ring is sleeved on the outer side of the connecting sleeve housing.

[0014] In this technical solution, the connecting sleeve housing and the sealing ring at the lower end of the valve body connecting seat are sleeved into the toilet tank connecting seat, so that the sealing ring abuts against the inner side wall and the top side wall of the toilet tank connecting seat. The clamping block drives the sliding plate to move, and the second spring is compressed, so that the clamping block is clamped into the clamping groove, and the connecting sleeve housing is fixed in the toilet tank connecting seat through the clamping block. The sealing ring can ensure that the connection part is in a sealed state, so that the valve body connecting seat is better fixed in the toilet tank.

[0015] Preferably, a sliding through groove is formed on the side wall of the connecting sleeve housing. The clamping block is slidably connected in the sliding through groove. One end of the clamping block is matched with the clamping groove, and the side wall of the other end of the clamping block is inclined.

[0016] In this technical solution, the sliding through groove facilitates the sliding of the clamping block.

[0017] Preferably, an annular convex block is arranged on the side wall of the connecting sleeve housing. A socket groove is formed on the inner side wall of the sealing ring. The annular convex block is rotatably connected in the socket groove.

[0018] In this technical solution, the annular convex block plays a certain role in limiting the sealing ring to prevent the sealing ring from falling off.

[0019] Preferably, the sleeve structure includes a first fixed ring plate, a drainage sleeve, a pressing ring plate, a connecting ring plate, a connecting ring block and a threaded sleeve. The drainage sleeve is sleeved on the inner side wall of the valve body connecting seat. The top of the drainage sleeve is fixedly connected to the connecting ring plate. The connecting ring plate is slidably connected to the side wall of the water inlet on the valve body connecting seat. The side wall of the connecting ring plate is fixedly connected to the connecting ring block. A threaded sleeve is rotatably connected to the side wall of the connecting ring block. A first fixed ring plate is fixedly connected to the side wall of the threaded sleeve. A pressing ring plate is fixedly connected to the inner side wall of the drainage sleeve.

[0020] In this technical solution, when the threaded sleeve is screwed down on the valve body connecting seat, the downward movement of the threaded sleeve drives the connecting ring block to move downward. The connecting ring block drives the connecting ring block to move downward. The connecting ring plate moves downward. The connecting ring plate drives the drainage sleeve to move downward. The downward movement of the drainage sleeve pushes the clamping block to move.

[0021] Preferably, the side wall of the first fixed ring plate is provided with insertion slots at equal intervals. The size of the inner side wall of the drainage sleeve matches the size of the sealing piece on the drainage valve control valve body.

[0022] In this technical solution, the sealing piece on the drainage valve control valve body can be blocked in the drainage sleeve to complete the blocking of the drainage valve.

[0023] Preferably, an external thread is provided on the outer side wall of the valve body connecting seat. The external thread on the valve body connecting seat meshes with the thread on the threaded sleeve.

[0024] Preferably, the limiting structure includes a fixed block, a limiting rod, a sliding sleeve and a first spring. The fixed block is fixedly connected to the side walls on both sides of the drainage valve control valve body. The limiting rod is slidably connected to the side wall of the fixed block. The top of the limiting rod is fixedly connected to the sliding sleeve. The sliding sleeve is slidably connected to the side wall of the drainage valve control valve body. A first spring is fixedly connected between the sliding sleeve and the fixed block.

[0025] Preferably, the limiting rod and the insertion slot cooperate with each other.

[0026] In this technical solution, when the sliding sleeve is pulled upward, the first spring is stretched. The sliding sleeve drives the limiting rod to rise. After the drainage valve control valve body is clamped and fixed on the valve body connecting seat, the sliding sleeve is released. The first spring retracts and drives the limiting rod to descend, so that the limiting rod is inserted into the corresponding insertion slot on the first fixed ring plate. The rotation of the first fixed ring plate is restricted by the limiting rod, thereby restricting the rotation of the threaded sleeve, avoiding the drainage sleeve rising away from the clamping block, resulting in the clamping block disengaging from the clamping groove, and causing the connection between the valve body connecting seat and the toilet tank connecting seat to become loose.

[0027] On the basis of conforming to the common knowledge in the art, the above preferred conditions can be combined arbitrarily to obtain various preferred examples of the present invention.

[0028] The positive progress effect of this utility model is:

[0029] 1. By inserting the connecting sleeve and the sealing ring at the lower end of the valve body connecting seat into the toilet water tank connecting seat, and then twisting the threaded sleeve downward on the valve body connecting seat, the threaded sleeve drives the drain sleeve to move downward, and the downward movement of the drain sleeve pushes the clamping block to move, so that the clamping block is clamped into the clamping groove. The connecting sleeve is fixed in the toilet water tank connecting seat through the clamping block, and the sealing ring can ensure that the connection is in a sealed state, so that the valve body connecting seat is better fixed in the toilet water tank without the aid of tools.

[0030] 2. The rotation of the fixed ring plate 1 is limited by the limit rod, thereby limiting the rotation of the threaded sleeve, so as to prevent the drain sleeve from rising away from the clamping block, causing the clamping block to disengage from the clamping groove, and causing the connection between the valve body connecting seat and the toilet tank connecting seat to loosen.

[0031] 3. By rotating the threaded sleeve upward, the drain sleeve is driven to leave the clamping block, and the clamping block is no longer resisted. The second spring expands to push the clamping block out of the clamping groove. The connecting sleeve is no longer restricted. Pull the valve body connecting seat upward to complete the disassembly of the drain valve, making the disassembly of the drain valve more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model.

[0033] Figure 2 This is a schematic diagram of the three-dimensional structure of the control valve body of the drain valve of the utility model.

[0034] Figure 3 It is a schematic diagram of the three-dimensional structure of the valve body connecting seat of the utility model.

[0035] Figure 4 It is a schematic diagram of the overall internal structure of the utility model.

[0036] Figure 5 For the utility model as a whole Figure 4 Schematic diagram of the local enlarged structure at point A.

[0037] Figure 6 For the utility model as a whole Figure 6 Schematic diagram of the local enlarged structure at point B

[0038] Description of Reference Numerals

[0039] 1. Drain valve control valve body; 2. Valve body connection seat; 3. Limit structure; 301. Fixed block; 302. Limit rod; 303. Sliding sleeve; 304. First spring; 4. Toilet tank connection seat; 5. Sleeve structure; 501. First fixed ring plate; 502. Drain sleeve; 503. Tightening ring plate; 504. Connecting ring plate; 505. Connecting ring block; 506. Threaded sleeve; 6. Clamping groove; 7. Clamping and fixing structure; 701. Connecting sleeve housing; 702. Fixed rod; 703. Second spring; 704. Sliding plate; 705. Sealing ring; 706. Clamping block; 707. Second fixed ring plate; 711. Ring-shaped convex block; 712. Socket groove; 8. Sliding through groove; 9. Insertion groove. Detailed implementation manners

[0040] The present utility model will be further described below by way of embodiments, but the present utility model is not limited to the scope of the described embodiments.

[0041] As Figures 1-6 shown, a drain valve that is convenient to disassemble includes a drain valve control valve body 1, the bottom of the drain valve control valve body 1 is clamped and fixed with a valve body connection seat 2, and further includes:

[0042] A limit structure 3, the limit structure 3 is arranged on the drain valve control valve body 1;

[0043] A sleeve structure 5, the sleeve structure 5 is arranged on the valve body connection seat 2;

[0044] A clamping and fixing structure 7, the clamping and fixing structure 7 is arranged at the bottom of the valve body connection seat 2;

[0045] A toilet tank connection seat 4, the toilet tank connection seat 4 is arranged on the clamping and fixing structure 7, and the clamping and fixing structure 7 fixedly connects the valve body connection seat 2 to the toilet tank connection seat 4.

[0046] A clamping groove 6 is formed on the inner side wall of the toilet tank connection seat 4.

[0047] The clamping and fixing structure 7 includes a connecting sleeve housing 701, a fixed rod 702, a second spring 703, a sliding plate 704, a sealing ring 705, a clamping block 706 and a second fixed ring plate 707. The connecting sleeve housing 701 is fixedly connected to the bottom side wall of the valve body connection seat 2. A fixed rod 702 is fixedly connected to the inner side wall of the connecting sleeve housing 701. A sliding plate 704 is fixedly connected to the side wall of the clamping block 706. The sliding plate 704 is slidably connected to the fixed rod 702. The second spring 703 is fixedly connected between the sliding plate 704 and the inner side wall of the connecting sleeve housing 701. A second fixed ring plate 707 is fixedly connected to the outer side wall of the connecting sleeve housing 701. The sealing ring 705 is sleeved on the outer side of the connecting sleeve housing 701.

[0048] Socket the connecting sleeve housing 701 and the sealing ring 705 at the lower end of the valve body connecting seat 2 into the toilet tank connecting seat 4, so that the sealing ring 705 abuts against the inner side wall and the top side wall of the toilet tank connecting seat 4. The clamping block 706 drives the sliding plate 704 to move, and the second spring 703 is compressed, so that the clamping block 706 is clamped into the clamping groove 6. Through the clamping block 706, the connecting sleeve housing 701 is fixed in the toilet tank connecting seat 4. The sealing ring 705 can ensure that the connection is in a sealed state, so that the valve body connecting seat 2 is better fixed in the toilet tank.

[0049] A sliding through groove 8 is formed on the side wall of the connecting sleeve housing 701. The clamping block 706 is slidably connected in the sliding through groove 8. One end of the clamping block 706 cooperates with the clamping groove 6, and the side wall of the other end of the clamping block 706 is inclined.

[0050] The sliding through groove 8 facilitates the sliding of the clamping block 706.

[0051] A ring-shaped convex block 711 is arranged on the side wall of the connecting sleeve housing 701. A socket groove 712 is formed on the inner side wall of the sealing ring 705. The ring-shaped convex block 711 is rotatably connected in the socket groove 712.

[0052] The ring-shaped convex block 711 plays a certain role in limiting the sealing ring 705 to prevent the sealing ring 705 from falling off.

[0053] The sleeve structure 5 includes a first fixed ring plate 501, a drainage sleeve 502, a pressing ring plate 503, a connecting ring plate 504, a connecting ring block 505 and a threaded sleeve 506. The drainage sleeve 502 is sleeved on the inner side wall of the valve body connecting seat 2. The top of the drainage sleeve 502 is fixedly connected to the connecting ring plate 504. The connecting ring plate 504 is slidably connected to the side wall of the water inlet of the valve body connecting seat 2. A connecting ring block 505 is fixedly connected to the side wall of the connecting ring plate 504. A threaded sleeve 506 is rotatably connected to the side wall of the connecting ring block 505. A first fixed ring plate 501 is fixedly connected to the side wall of the threaded sleeve 506. A pressing ring plate 503 is fixedly connected to the inner side wall of the drainage sleeve 502.

[0054] When the threaded sleeve 506 is screwed down on the valve body connecting seat 2, the threaded sleeve 506 moves downward to drive the connecting ring block 505 to move downward. The connecting ring block 505 drives the connecting ring block 505 to move downward. The connecting ring plate 504 moves downward. The connecting ring plate 504 drives the drainage sleeve 502 to move downward. The drainage sleeve 502 moves downward to push the clamping block 706 to move.

[0055] The side wall of the fixed ring plate 1 - 501 is equidistantly provided with insertion slots 9, and the size of the inner side wall of the drain sleeve 502 is matched with the size of the sealing piece on the drain valve control valve body 1.

[0056] The sealing piece on the drain valve control valve body 1 can be blocked inside the drain sleeve 502 to complete the blocking of the drain valve.

[0057] The outer side wall of the valve body connecting seat 2 is provided with an external thread, and the external thread on the valve body connecting seat 2 meshes with the thread on the threaded sleeve 506.

[0058] The limiting structure 3 includes a fixed block 301, a limiting rod 302, a sliding sleeve 303 and a first spring 304. The fixed block 301 is fixedly connected to the side walls on both sides of the drain valve control valve body 1. The limiting rod 302 is slidably connected to the side wall of the fixed block 301. The top of the limiting rod 302 is fixedly connected to the sliding sleeve 303. The sliding sleeve 303 is slidably connected to the side wall of the drain valve control valve body 1. A first spring 304 is fixedly connected between the sliding sleeve 303 and the fixed block 301.

[0059] The limiting rod 302 and the insertion slot 9 cooperate with each other.

[0060] Pull the sliding sleeve 303 upward, the first spring 304 is stretched, the sliding sleeve 303 drives the limiting rod 302 to rise. After the drain valve control valve body 1 is clamped and fixed on the valve body connecting seat 2, release the sliding sleeve 303. The first spring 304 retracts and drives the limiting rod 302 to descend, so that the limiting rod 302 is inserted into the corresponding insertion slot 9 on the fixed ring plate 1 - 501. The rotation of the fixed ring plate 1 - 501 is restricted by the limiting rod 302, thereby restricting the rotation of the threaded sleeve 506, avoiding the drain sleeve 502 rising and leaving the clamping block 706, resulting in the clamping block 706 disengaging from the clamping slot 6, and causing the connection between the valve body connecting seat 2 and the toilet tank connecting seat 4 to become loose.

[0061] When the present utility model is in use and connecting the drain valve to the toilet tank, the connecting sleeve housing 701 and the sealing ring 705 at the lower end of the valve body connecting seat 2 are sleeved into the toilet tank connecting seat 4, so that the sealing ring 705 abuts against the inner side wall and the top side wall of the toilet tank connecting seat 4. Then, the threaded sleeve 506 is screwed downward on the valve body connecting seat 2. The threaded sleeve 506 moves downward and drives the connecting ring block 505 to move downward. The connecting ring block 505 drives the connecting ring block 505 to move downward. The connecting ring plate 504 moves downward. The connecting ring plate 504 drives the drain sleeve 502 to move downward. The drain sleeve 502 moves downward and pushes the clamping block 706 to move. The clamping block 706 drives the sliding plate 704 to move, and the second spring 703 is compressed, so that the clamping block 706 is clamped into the clamping slot 6.

[0062] If the clamping block 706 cannot be pushed by the drainage sleeve 502 all the time, it indicates that the positions of the clamping block 706 and the clamping groove 6 do not correspond to each other. At this time, just rotate it left and right for adjustment so that the clamping block 706 and the clamping groove 6 are aligned. Then the clamping block 706 can retract into the connecting sleeve housing 701. Through the clamping block 706, the connecting sleeve housing 701 is fixed in the toilet water tank connecting seat 4. The sealing ring 705 can ensure that the connection part is in a sealed state, so that the valve body connecting seat 2 is better fixed in the toilet water tank;

[0063] Pull up the sliding sleeve 303, the first spring 304 is pulled by the pull rope, the sliding sleeve 303 drives the limiting rod 302 to rise. After the drain valve control valve body 1 is clamped and fixed on the valve body connecting seat 2, release the sliding sleeve 303. The first spring 304 retracts and drives the limiting rod 302 to descend, so that the limiting rod 302 is inserted into the corresponding insertion groove 9 on the first fixed ring plate 501, and the rotation of the first fixed ring plate 501 is restricted by the limiting rod 302, thereby restricting the rotation of the threaded sleeve 506, and preventing the drainage sleeve 502 from rising away from the clamping block 706, resulting in the clamping block 706 disengaging from the clamping groove 6 and causing the connection between the valve body connecting seat 2 and the toilet water tank connecting seat 4 to become loose;

[0064] When disassembling, just rotate the threaded sleeve 506 upward to drive the drainage sleeve 502 away from the clamping block 706. The clamping block 706 is no longer resisted, the second spring 703 expands and pushes the clamping block 706 out of the clamping groove 6. The connecting sleeve housing 701 is no longer restricted. Pull up the valve body connecting seat 2 to complete the disassembly of the drain valve.

[0065] The present utility model is not limited to the above embodiments. No matter what changes are made in its shape or structure, they all fall within the protection scope of the present utility model. The protection scope of the present utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present utility model, but these changes and modifications all fall within the protection scope of the present utility model.

Claims

1. A drain valve that is easy to disassemble, comprising a drain valve control valve body (1), wherein the bottom of the drain valve control valve body (1) is fixedly connected with a valve body connecting seat (2), and is characterized in that: Also includes: A limiting structure (3), wherein the limiting structure (3) is arranged on the drain valve control valve body (1); A sleeve structure (5), wherein the sleeve structure (5) is arranged on the valve body connecting seat (2); A clamping fixing structure (7), wherein the clamping fixing structure (7) is arranged at the bottom of the valve body connecting seat (2); A toilet water tank connection seat (4) is provided on a clamping fixing structure (7), and the clamping fixing structure (7) fixes the valve body connection seat (2) to the toilet water tank connection seat (4).

2. The detachable drain valve according to claim 1, characterized in that: A clamping groove (6) is provided on the inner side wall of the toilet tank connecting seat (4).

3. The easily disassembled drain valve according to claim 1, characterized in that: The clamping and fixing structure (7) comprises a connecting sleeve (701), a fixing rod (702), a second spring (703), a sliding plate (704), a sealing ring (705), a clamping block (706) and a second fixing ring plate (707); the connecting sleeve (701) is fixedly connected to the bottom side wall of the valve body connecting seat (2); the fixing rod (702) is fixedly connected to the inner side wall of the connecting sleeve (701); the sliding plate (704) is fixedly connected to the side wall of the clamping block (706); the sliding plate (704) is slidably connected to the fixing rod (702); the second spring (703) is fixedly connected to the sliding plate (704) and the inner side wall of the connecting sleeve (701); the second fixing ring plate (707) is fixedly connected to the outer side wall of the connecting sleeve (701); and the sealing ring (705) is sleeved on the outer side of the connecting sleeve (701).

4. The easily disassembled drain valve according to claim 3, characterized in that: A sliding groove (8) is provided on the side wall of the connecting sleeve (701), and the clamping block (706) is slidably connected in the sliding groove (8). One end of the clamping block (706) cooperates with the clamping groove (6), and the side wall of the other end of the clamping block (706) is inclined.

5. The easily disassembled drain valve according to claim 3, characterized in that: An annular protrusion (711) is provided on the side wall of the connecting sleeve (701), a sleeve groove (712) is provided on the inner side wall of the sealing ring (705), and the annular protrusion (711) is rotatably connected in the sleeve groove (712).

6. The drain valve that is conveniently disassembled as described in claim 1, characterized in that: The sleeve structure (5) comprises a fixed ring plate (501), a drainage sleeve (502), a tightening ring plate (503), a connecting ring plate (504), a connecting ring block (505) and a threaded sleeve (506); the drainage sleeve (502) is sleeved on the inner side wall of the valve body connecting seat (2); the top of the drainage sleeve (502) is fixedly connected to the connecting ring plate (504); the connecting ring plate (504) and the side wall of the water inlet on the valve body connecting seat (2) are slidably connected; the connecting ring block (505) is fixedly connected to the side wall of the connecting ring plate (504); the threaded sleeve (506) is rotatably connected to the side wall of the connecting ring block (505); the fixed ring plate (501) is fixedly connected to the side wall of the threaded sleeve (506); the tightening ring plate (503) is fixedly connected to the inner side wall of the drainage sleeve (502).

7. The easily disassembled drain valve according to claim 6, characterized in that: The side wall of the fixed ring plate one (501) is provided with insertion slots (9) at equal intervals, and the size of the inner side wall of the drainage sleeve (502) is matched with the size of the sealing piece on the drainage valve control valve body (1).

8. The easily disassembled drain valve according to claim 1, characterized in that: The outer side wall of the valve body connecting seat (2) is provided with an external thread, and the external thread on the valve body connecting seat (2) meshes with the thread on the threaded sleeve (506).

9. The detachable drain valve according to claim 1, wherein: The limiting structure (3) includes a fixed block (301), a limiting rod (302), a sliding sleeve (303) and a first spring (304). The fixed block (301) is fixedly connected to the side walls on both sides of the drainage valve control valve body (1). The limiting rod (302) is slidably connected to the side wall of the fixed block (301). The top of the limiting rod (302) is fixedly connected to the sliding sleeve (303). The sliding sleeve (303) is slidably connected to the side wall of the drainage valve control valve body (1). A first spring (304) is fixedly connected between the sliding sleeve (303) and the fixed block (301).

10. The conveniently detachable drain valve according to claim 9, characterized in that: The limiting rod (302) and the insertion slot (9) cooperate with each other.

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