Air conditioning air inlet filter structure

Abstract

The present invention belongs to the field of air-conditioning air inlet filtration, specifically an air-conditioning air inlet filtration structure, including an air outlet frame and a grille plate arranged at the bottom of the air outlet frame, the upper part of the air outlet frame is provided with a closed frame by bolts, the upper part of the air outlet frame is provided with rectangular openings on both the front and rear sides, and the two rectangular openings are provided with a filter assembly for filtering the air entering the air outlet frame. When filtering the air, the present invention can reasonably switch the filter body between a single-layer and a three-layer use state according to different use environments, which not only ensures the filtering effect of the air, but also effectively delays the clogging cycle, reduces the frequency of disassembly and cleaning of the filter body, and at the same time, the opening can be blocked during the transmission replacement process of the filter body, so that the dust on the used filter body is not easy to escape into the air outlet on the air outlet frame after being rolled up, further ensuring the filtering effect of the air.

Description

Technical Field

[0001] The invention relates to the field of air-conditioning air inlet filtering, in particular to an air-conditioning air inlet filtering structure. Background Art

[0002] With the widespread use of central air-conditioning in commercial buildings, factories, office buildings and other places, the performance of its air inlet filtration structure is crucial to air quality and equipment operating efficiency.

[0003] Currently, the filtration structure within central air conditioner outlets is generally simple, typically consisting of a single-layer filter attached to the back of the grille via snaps. This filter filters the air. This traditional structure has certain limitations: in dusty environments like offices and conference rooms, where daily activities generate relatively limited pollutants, a single-layer filter can meet basic filtration requirements and maintain basic indoor air quality. However, in dusty environments like factories and construction sites, a single-layer filter can easily become clogged with large amounts of pollutants, resulting in a sudden drop in air intake and increased air conditioning energy consumption. Furthermore, the filter needs to be removed and cleaned more frequently, impacting the normal operation of the air conditioner. Summary of the Invention

[0004] In view of the above problems, an air-conditioning air inlet filter structure provided in an embodiment of the present application can reasonably switch the filter body between single-layer or three-layer usage states according to different usage environments, thereby ensuring the air filtration effect while reducing the frequency of cleaning the filter body.

[0005] In order to achieve the above-mentioned purpose, the embodiment of the present application provides the following technical solution: The present invention provides an air-conditioning air inlet filter structure, comprising an air outlet frame and a grille plate arranged at the bottom of the air outlet frame, the upper part of the air outlet frame is provided with a closed frame by bolts, and rectangular openings are provided on the front and rear sides of the upper part of the air outlet frame, and a filter assembly for filtering the air entering the air outlet frame is jointly provided in the two rectangular openings.

[0006] The filter assembly includes two mounting plates fixedly arranged in corresponding rectangular openings and symmetrically distributed on the left and right sides. A unwinding roller is rotatably arranged between the two mounting plates located on the front side, and a winding roller is rotatably arranged between the two mounting plates located on the rear side. The filter body is wound between the winding roller and the unwinding roller.

[0007] A support assembly for auxiliary support of the filter assembly after the filter assembly changes shape is provided on the inner side of the tuyere frame. The support assembly includes two support rollers provided on the inner side of the tuyere frame.

[0008] The interior of the air outlet frame is provided with two through openings which are connected to the corresponding rectangular openings respectively, for allowing the filter body to be transmitted in the two rectangular openings. A sealing assembly for sealing the through openings is provided in the rectangular openings, and the sealing assembly includes a U-shaped sealing plate provided in the rectangular openings. The U-shaped sealing plate is located at the through openings and its bottom abuts against the upper part of the filter body.

[0009] According to a favorable embodiment, the filter assembly also includes two motors fixedly arranged on the left side of the two left mounting plates, the output shaft of the front motor is connected to the left end of the winding roller, and the output shaft of the rear motor is connected to the left end of the unwinding roller.

[0010] According to an advantageous embodiment, a threaded head is fixedly provided on the right end of the support roller, and two threaded holes for use with the threaded heads are provided on the inner right side wall of the air outlet frame, and the threaded heads are threadedly connected to the threaded holes.

[0011] According to an advantageous embodiment, two circular openings are opened on the left side of the tuyere frame for the two support rollers to pass through the interior of the tuyere frame respectively, and the left ends of the support rollers are located in the circular openings.

[0012] According to a favorable embodiment, a magnetic plate is fixedly provided on the upper parts of the two vertical sections of the U-shaped sealing plate, two connecting blocks symmetrically distributed on the left and right are fixedly provided in the rectangular opening, a connecting rod is fixedly provided at the bottom of the connecting block, the bottom end of the connecting rod passes through the magnetic plate, a reset spring is provided on the outer side of the connecting rod, and the two ends of the reset spring are respectively connected to the connecting block and the magnetic plate, and an electromagnet for magnetically adsorbing the magnetic plate is fixedly provided at the upper part of the magnetic plate in the rectangular opening.

[0013] According to an advantageous embodiment, a supporting plate is fixedly provided in the rectangular opening at the lower end of the filter body, and the upper portion of the supporting plate contacts the bottom of the filter body.

[0014] According to an advantageous embodiment, the grille plate is provided with sockets at four corners, and strip-shaped openings communicating with the sockets are provided at the left and right ends of the grille plate.

[0015] According to a favorable embodiment, the four corners of the bottom of the air outlet frame are rotatably provided with plug rods for use with the sockets, the bottom ends of the plug rods pass through the sockets, and two limit blocks staggered with the strip openings are fixedly provided on the outside of the plug rods, and the upper parts of the limit blocks are in contact with the bottom of the grille plate.

[0016] According to an advantageous embodiment, rectangular grooves are provided on both left and right sides of the bottom of the air outlet frame, a rotating shaft is rotatably provided inside the rectangular groove, and a support block is fixedly provided outside the rotating shaft.

[0017] According to a favorable embodiment, grooves are provided on both the left and right sides of the bottom of the air outlet frame, and a limit rod is slidingly provided inside the groove. The bottom end of the limit rod abuts against the upper part of the grille plate, the top end of the limit rod passes through the groove and its outer side contacts one side of the support block, and a return spring 2 is provided on the outer side of the limit rod, one end of the return spring 2 is connected to the upper end face of the convex edge of the limit rod, and the other end is connected to the inner wall of the groove.

[0018] Compared with the prior art, an air-conditioning air inlet filter structure provided by an embodiment of the present invention has the following beneficial effects: 1. When filtering the air, the present invention can reasonably switch the filter body between single-layer and three-layer usage states according to different usage environments, which not only ensures the air filtering effect, but also effectively delays the clogging cycle, reduces the frequency of disassembly and cleaning of the filter body, and at the same time, during the rotation and replacement of the filter body, the opening can be blocked by the blocking component, so that the dust on the used filter body is not easily dissipated into the air outlet on the air outlet frame after being rolled up, further ensuring the air filtering effect.

[0019] 2. The present invention is provided with a support assembly and a filter assembly, and the motor is used to drive the winding roller and the unwinding roller to rotate, so that the filter body can be wound and unwound, so that the filter body can be distributed in a single layer in a use environment with less dust. In an environment with more dust, the support roller can cooperate with the filter body to make it have a three-layer distribution in a serpentine state, so that the air in different environments can be fully filtered, and the frequency of replacing the filter body can be reduced.

[0020] 3. A sealing assembly is provided in the present invention. When the filter body is replaced, the electromagnet drives the U-shaped sealing plate to move up, thereby canceling the positioning of the filter body, so that the filter body can be rotated and replaced. After the replacement is completed, the electromagnet stops working, and the U-shaped sealing plate moves down to seal the opening, so that the dust on the used filter body is not easily dissipated into the air outlet on the air outlet frame after it is rolled up, thereby ensuring the filtering effect of the air.

[0021] 4. The present invention is provided with a support block, two return springs and a limit rod. By rotating the support block so that its bottom contacts the upper part of the ceiling, the air outlet frame can be preliminarily positioned. Then, when the grille plate is installed on the air outlet frame, the support block can be limited and locked by squeezing the limit rod, thereby ensuring that the support block will not shift, further ensuring the stability of the air outlet frame when installed in the air inlet, and effectively avoiding the loosening of the air outlet frame due to vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of the first perspective of the present invention.

[0023] Figure 2 This is a structural diagram of the second viewing angle of the present invention.

[0024] Figure 3 This is a structural diagram of the connection between the air outlet frame and the filter assembly in the present invention.

[0025] Figure 4 This is a cross-sectional view of the connection structure of the air outlet frame and the filter body when used in a single-layer state in the present invention.

[0026] Figure 5 for Figure 4 A magnified view of the structure in part A.

[0027] Figure 6 It is a partial structural diagram of the blocking component in the present invention.

[0028] Figure 7 It is a cross-sectional view of the connection structure between the support assembly and the tuyere frame in the present invention.

[0029] Figure 8 It is a cross-sectional structural diagram of the air outlet frame of the present invention.

[0030] Figure 9 This is a partial separation structure diagram of the grid plate and the insertion rod in the present invention.

[0031] Figure 10 This is a partial connection structure diagram of the support block and the tuyere frame in the present invention.

[0032] Figure 11 It is a cross-sectional view of the connection structure between the air outlet frame and the limiting rod in the present invention.

[0033] Figure 12 for Figure 11 A magnified view of the structure of part B.

[0034] Figure 13 This is a cross-sectional view of the connection structure of the air outlet frame and the filter body when used in a three-layer state in the present invention.

[0035] Figure 14 This is a diagram showing the position status of the limit rod and the support block when the grid plate is not installed in the present invention.

[0036] The accompanying drawings are as follows: 1. air outlet frame; 2. grille plate; 3. closing frame; 4. rectangular opening; 5. filter assembly; 51. mounting plate; 52. unwinding roller; 53. winding roller; 54. filter body; 55. motor; 6. support assembly; 61. support roller; 62. threaded head; 7. through opening; 8. blocking assembly; 81. U-shaped blocking plate; 82. magnetic plate; 83. connecting block; 84. connecting rod; 85. reset spring 1; 86. electromagnet; 9. threaded hole; 10. circular opening; 11. supporting plate; 12. socket; 13. strip opening; 14. plugging rod; 15. limiting block; 16. rectangular groove; 17. rotating shaft; 18. support block; 19. groove; 20. limiting rod; 21. reset spring 2. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1 - Figure 14 This application is described in further detail.

[0038] Please refer to Figure 1 、 Figure 2 and Figure 10 An air-conditioning air inlet filter structure includes an air outlet frame 1 and a grille plate 2 arranged at the bottom of the air outlet frame 1. Rectangular grooves 16 are opened on the left and right sides of the bottom of the air outlet frame 1. A rotating shaft 17 is rotatably arranged inside the rectangular groove 16, and a support block 18 is fixedly arranged on the outside of the rotating shaft 17.

[0039] When installing the air vent frame 1 at the air inlet position of the air conditioner on the ceiling, the staff can move the air vent frame 1 to the air inlet position and make the upper part of the air vent frame 1 pass through the air inlet, and then rotate the support block 18 to move it out of the rectangular groove 16, and make one side of it fit with the inner wall of the rectangular groove 16. At this time, the bottom of the support block 18 contacts the upper part of the ceiling, so that the support block 18 can be used to support and limit the air vent frame 1 in the air inlet, completing the preliminary positioning of the air vent frame 1.

[0040] See Figure 1 and Figure 9 Sockets 12 are provided at each of the four corners of the grille plate 2, and strip openings 13 communicating with the sockets 12 are provided at the left and right ends of the grille plate 2. Insertion rods 14 for use with the insertion rods 12 are rotatably provided at the four corners of the bottom of the air outlet frame 1. The bottom ends of the insertion rods 14 pass through the insertion rods 12, and two stoppers 15 are fixedly provided on the outside of the insertion rods 14, which are offset from the strip openings 13, and the upper portions of the stoppers 15 are in contact with the bottom of the grille plate 2.

[0041] See Figure 11 and Figure 12A groove 19 is provided on both sides of the bottom of the air outlet frame 1. A limit rod 20 is slidingly provided inside the groove 19. The bottom end of the limit rod 20 abuts against the upper part of the grille plate 2. The top end of the limit rod 20 passes through the groove 19 and its outer side contacts one side of the support block 18. A return spring 21 is provided on the outer side of the limit rod 20. One end of the return spring 21 is connected to the upper end surface of the convex edge of the limit rod 20, and the other end is connected to the inner wall of the groove 19.

[0042] After the air inlet frame 1 is initially limited in the air inlet, the limiting rod 20 does not limit the support block 18 (such as Figure 14 The support block 18 can be limited by the limit rod 20, thereby ensuring that the support block 18 will not shift after contacting the upper part of the ceiling, thereby further ensuring the stability of the air outlet frame 1 when the air outlet frame 1 is installed.

[0043] See Figure 2 、 Figure 3 and Figure 4 The upper portion of the vent frame 1 is bolted with a closing frame 3. Rectangular openings 4 are provided on both the front and rear sides of the upper portion of the vent frame 1. A filter assembly 5 for filtering the air entering the vent frame 1 is located within the two rectangular openings 4. The filter assembly 5 includes two mounting plates 51, each fixedly mounted within the corresponding rectangular opening 4 and symmetrically distributed therebetween. A reel 52 is rotatably mounted between the two mounting plates 51 located on the front side, and a reel 53 is rotatably mounted between the two mounting plates 51 located on the rear side. A filter body 54 is wound between the reel 53 and the reel 52.

[0044] See Figure 3 The filter assembly 5 also includes two motors 55 fixedly arranged on the left side of the two left mounting plates 51. The output shaft of the front motor 55 is connected to the left end of the winding roller 53, and the output shaft of the rear motor 55 is connected to the left end of the unwinding roller 52.

[0045] After the air outlet frame 1 and the grille plate 2 are installed, when the central air conditioner is working, the air enters the air outlet frame 1 and passes through the air outlet. The air can be filtered by the filter body 54. At this time, the filter body 54 is in a single-layer distribution state (such as Figure 4 It is suitable for offices, meeting rooms and other scenes with less dust.

[0046] When the filter body 54 needs to be replaced, the two motors 55 work to drive the winding roller 53 and the unwinding roller 52 to rotate synchronously and in the same direction, so that the used filter body 54 can be wound up from the air outlet of the air outlet frame 1 onto the winding roller 53, and then the unused new filter body 54 on the unwinding roller 52 is moved to the air outlet of the air outlet frame 1. There is no need for personnel to manually disassemble and clean the filter body 54 and then install it. The entire replacement process is automated, which makes the replacement of the filter body 54 more convenient and greatly improves the replacement efficiency of the filter body 54. The air conditioner does not need to be shut down and can be replaced while the air conditioner is working.

[0047] See Figure 3 、 Figure 4 and Figure 5 Two through openings 7 are opened inside the air outlet frame 1, which are respectively connected to the corresponding rectangular openings 4. The through openings 7 are used for the filter body 54 to be transmitted in the two rectangular openings 4. A sealing component 8 is provided in the rectangular opening 4 for sealing the through opening 7. The sealing component 8 includes a U-shaped sealing plate 81 arranged in the rectangular opening 4. The U-shaped sealing plate 81 is located at the through opening 7 and its bottom is abutted against the upper part of the filter body 54.

[0048] See Figure 5 and Figure 6 A magnetic plate 82 is fixedly provided on the upper parts of the two vertical sections of the U-shaped sealing plate 81. Two connecting blocks 83 symmetrically distributed on the left and right are fixedly provided in the rectangular opening 4. A connecting rod 84 is fixedly provided at the bottom of the connecting block 83. The bottom end of the connecting rod 84 passes through the magnetic plate 82. A return spring 85 is sleeved on the outer side of the connecting rod 84. The two ends of the return spring 85 are respectively connected to the connecting block 83 and the magnetic plate 82. An electromagnet 86 for magnetically adsorbing the magnetic plate 82 is fixedly provided on the upper part of the magnetic plate 82 in the rectangular opening 4.

[0049] See Figure 5 A supporting plate 11 is fixedly provided at the lower end of the filter body 54 in the rectangular opening 4 , and the upper portion of the supporting plate 11 contacts the bottom of the filter body 54 .

[0050] When the filter body 54 is replaced, the electromagnet 86 magnetically attracts the magnetic plate 82 before the motor 55 works. At this time, the magnetic plate 82 moves to squeeze the return spring 85, and at the same time drives the U-shaped sealing plate 81 to move up and away from the filter body 54, so that the motor 55 can drive the filter body 54 to be replaced between the winding roller 53 and the unwinding roller 52. After the replacement of the filter body 54 is completed, the electromagnet 86 stops working. At this time, the magnetic attraction force on the magnetic plate 82 disappears, and the elastic force of the return spring 85 can drive the U-shaped sealing plate 81 to move down and squeeze the filter body 54. At this time, the filter body 54 is located between the U-shaped sealing plate 81 and the supporting plate 11, and the U-shaped sealing plate 81 just blocks the through hole 7. Therefore, the dust on the used filter body 54 is not easy to escape into the air outlet on the air outlet frame 1 after it is wound up.

[0051] See Figure 1 and Figure 2 A support assembly 6 for auxiliary support of the filter assembly 5 after the shape change is provided on the inner side of the tuyere frame 1 . The support assembly 6 includes two support rollers 61 provided on the inner side of the tuyere frame 1 .

[0052] See Figure 2 、 Figure 7 and Figure 8 The right end of the support roller 61 is fixed with a threaded head 62. Two threaded holes 9 are provided on the right side wall of the interior of the tuyere frame 1 for use with the threaded heads 62. The threaded heads 62 are threadedly connected to the threaded holes 9. The left side of the tuyere frame 1 is provided with two circular openings 10 for the two support rollers 61 to be respectively inserted into the interior of the tuyere frame 1, and the left ends of the support rollers 61 are located in the circular openings 10.

[0053] When filtering air in a high dust environment such as a factory or a construction site, before installing the air outlet frame 1, the staff can remove the closing frame 3 from the air outlet frame 1, and then the electromagnet 86 on the front side works to drive the magnetic plate 82 on the front side to move up and cancel the positioning of the filter body 54, and then the front side motor 55 works to drive the unwinding roller 52 to rotate and unwind the filter body 54. When the filter body 54 is unwound to a suitable length, the staff can pull the unwound filter body 54 to form a three-layer distribution in a serpentine state (such as Figure 13As shown), in order to ensure that the three-layer filter body 54 in a serpentine state can be used stably, when the filter body 54 is pulled to be distributed in two layers, the staff can insert the support roller 61 from the circular opening 10 on the rear side into the inner side of the air outlet frame 1, and then rotate the support roller 61 when the threaded head 62 moves to the threaded hole 9, so that the threaded head 62 can be screwed into the threaded hole 9. At this time, the rear support roller 61 is located at the connection position of the first layer of filter body 54 and the second layer of filter body 54. Then, according to the same steps, the front support roller 61 is installed to the connection position of the second layer of filter body 54 and the third layer of filter body 54. Then, the two support rollers 61 can be used to ensure that the filter body 54 is in a stable three-layer distribution in a serpentine state. The three-layer distribution of the filter body 54 can fully filter the air in a high dust environment to ensure the filtering effect, and at the same time, the cycle of disassembly and cleaning of the filter body 54 can be extended.

[0054] During specific operation, when the central air conditioner is used in scenes such as offices and conference rooms with less dust, there is no need to switch the use status of the filter body 54. At this time, the filter body 54 is used in a single-layer distribution state. When filtering the air in high-dust environments such as factories and construction sites, the filter body 54 on the unwinding roller 52 can be first unwound to a suitable length, and then the filter body 54 can be transformed into a three-layer distribution in a serpentine state through the support assembly 6 for use.

[0055] After the usage scenario of the air conditioner is determined and the usage status of the filter body 54 is adjusted, the staff can then move the air outlet frame 1 to the air inlet position and make the upper part of the air outlet frame 1 pass through the air inlet, and then rotate the support block 18 so that its bottom contacts the upper part of the ceiling, so that the support block 18 can be used to complete the preliminary positioning of the air outlet frame 1, and then install the grille plate 2 at the bottom end of the air outlet frame 1. During the process of installing the grille plate 2 at the bottom end of the air outlet frame 1, the support block 18 can be limited by the limit rod 20, which further ensures the stability of the air outlet frame 1 when it is installed in the air inlet, and then the air can be filtered through the filter body 54 when the air conditioner is working.

[0056] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An air inlet filter structure for an air conditioner, comprising an air inlet frame and a grille plate arranged at the bottom of the air inlet frame, characterized in that: The upper part of the tuyere frame is provided with a closing frame by bolts, and rectangular openings are provided on both the front and rear sides of the upper part of the tuyere frame, and a filter assembly for filtering the air entering the tuyere frame is provided in both rectangular openings; The filter assembly includes two mounting plates fixedly arranged in corresponding rectangular openings and symmetrically distributed on the left and right sides, a reeling roller is rotatably arranged between the two mounting plates located on the front side, and a reeling roller is rotatably arranged between the two mounting plates located on the rear side, and a filter body is wound between the reeling roller and the reeling roller; The inner side of the tuyere frame is provided with a support assembly for auxiliary support of the filter assembly after the filter assembly changes shape, and the support assembly includes two support rollers provided on the inner side of the tuyere frame; The interior of the air outlet frame is provided with two through openings which are connected to the corresponding rectangular openings respectively, for allowing the filter body to be transmitted in the two rectangular openings. A sealing assembly for sealing the through openings is provided in the rectangular openings, and the sealing assembly includes a U-shaped sealing plate provided in the rectangular openings. The U-shaped sealing plate is located at the through openings and its bottom abuts against the upper part of the filter body.

2. The air inlet filter structure of an air conditioner according to claim 1, characterized in that: The filter assembly also includes two motors fixedly arranged on the left sides of the two left mounting plates. The output shaft of the front motor is connected to the left end of the winding roller, and the output shaft of the rear motor is connected to the left end of the unwinding roller.

3. The air inlet filter structure of an air conditioner according to claim 1, characterized in that: A threaded head is fixedly provided on the right end of the support roller, and two threaded holes for use with the threaded head are provided on the inner right side wall of the air outlet frame, and the threaded head is threadedly connected to the threaded hole.

4. The air inlet filter structure of an air conditioner according to claim 1, characterized in that: The left side of the tuyere frame is provided with two circular openings for the two supporting rollers to pass through the interior of the tuyere frame respectively, and the left ends of the supporting rollers are located in the circular openings.

5. The air-conditioning air inlet filter structure according to claim 1, characterized in that: A magnetic plate is fixedly provided on the upper parts of the two vertical sections of the U-shaped sealing plate, two connecting blocks symmetrically distributed on the left and right are fixedly provided in the rectangular opening, a connecting rod is fixedly provided on the bottom of the connecting block, the bottom end of the connecting rod passes through the magnetic plate, a reset spring is sleeved on the outer side of the connecting rod, the two ends of the reset spring are respectively connected to the connecting block and the magnetic plate, and an electromagnet for magnetically adsorbing the magnetic plate is fixedly provided on the upper part of the magnetic plate in the rectangular opening.

6. The air inlet filter structure of an air conditioner according to claim 1, characterized in that: A supporting plate is fixedly arranged at the lower end of the filter body in the rectangular opening, and the upper part of the supporting plate contacts the bottom of the filter body.

7. The air inlet filter structure of an air conditioner according to claim 1, characterized in that: Sockets are provided at the four corners of the grille plate, and strip openings communicating with the sockets are provided at the left and right ends of the grille plate.

8. The air-conditioning air inlet filter structure according to claim 7, characterized in that: The four corners of the bottom of the air outlet frame are rotatably provided with plug rods for use with the sockets. The bottom ends of the plug rods pass through the sockets. Two limit blocks that are misaligned with the strip openings are fixed on the outside of the plug rods, and the upper parts of the limit blocks fit with the bottom of the grille plate.

9. The air-conditioning air inlet filter structure according to claim 1, characterized in that: Rectangular grooves are provided on both the left and right sides of the bottom of the air outlet frame. A rotating shaft is rotatably provided inside the rectangular groove, and a supporting block is fixedly provided on the outside of the rotating shaft.

10. The air-conditioning air inlet filter structure according to claim 9, characterized in that: Grooves are provided on the left and right sides of the bottom of the air outlet frame, and a limit rod is slidingly provided inside the groove. The bottom end of the limit rod abuts against the upper part of the grille plate, the top end of the limit rod passes through the groove and its outer side contacts one side of the support block, and a return spring 2 is sleeved on the outer side of the limit rod, one end of the return spring 2 is connected to the upper end face of the convex edge of the limit rod, and the other end is connected to the inner wall of the groove.

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