A wall verticality detection device

Abstract

The present application discloses a wall verticality detection device, belonging to the field of building construction technology, which includes a detection device body, a support disc is installed on the detection device body, a rotating block is arranged between the support disc and the detection device body, both ends of the rotating block close to the side wall of the support disc are fixedly connected with guide posts, a guide ring groove is provided on the support disc, the guide posts are slidably matched with the guide ring groove, a positioning assembly for fixing the guide posts and the support disc is arranged on the guide post, a plurality of metal balls are slidably penetrated in the rotating block, an arc groove for slidably matching with the metal balls is vertically provided in the rotating block, a first metal plate is penetrated at both ends of the inner wall of the arc groove, the first metal plate is symmetrically arranged about the axis of the arc groove, the first metal plate can abut against the outer peripheral surface of the metal ball, an indicator light is installed on the rotating block, and the first metal plate is electrically connected to the indicator lights respectively. The present application has the effect of improving the accuracy of the detection device.

Description

Technical Field

[0001] The present application relates to the technical field of building construction, and in particular to a device for detecting the verticality of a wall. Background Art

[0002] Building construction refers to the production activities in the implementation stage of engineering construction, which is the construction process of various buildings. In the process of building construction, in order to ensure the construction quality, the verticality of wall column structure, masonry structure and formwork engineering needs to be tested.

[0003] In the related technology, a Chinese utility model patent with announcement number CN217654533U discloses a verticality detection device for a construction project, including a top frame, a connecting plate fixedly connected to the top frame, a bottom frame fixedly connected to the connecting plate, and the top frame and the bottom frame are arranged in parallel. A laser lamp is arranged on the top frame, a sliding rod is arranged on the top frame, a mounting rod is arranged between the connecting plate and the sliding rod, and the mounting rod is provided with a balancing assembly. The balancing assembly includes a rotating cylinder rotatably arranged on the mounting rod and a counterweight fixedly connected to the rotating cylinder. A light-transmitting hole is opened on the rotating cylinder, and the axis of the light-transmitting hole can coincide with the laser lamp. The length direction of the sliding rod is parallel to the axis of the light-transmitting hole, and the mounting rod is provided with a mounting groove for the rotating cylinder to pass through.

[0004] With regard to the above-mentioned related technologies, the inventor believes that when the operator places the sliding rod close to the wall and then observes the position of the bubble in the level by naked eyes to adjust the verticality of the detection device, there is a certain error, causing the verticality detection device to tilt, thereby increasing the horizontal force of the balancing component and reducing the accuracy of the device. Utility Model Content

[0005] In order to improve the accuracy of the detection device, the present application provides a wall verticality detection device.

[0006] The present application provides a wall verticality detection device that adopts the following technical solution:

[0007] A wall verticality detection device comprises a detection device body, a supporting disc is installed on the detection device body, a rotating block is arranged between the supporting disc and the detection device body, both ends of the rotating block close to the side wall of the supporting disc are fixedly connected with guide columns, the supporting disc is provided with a guide ring groove, the guide columns are slidably matched with the guide ring groove, and a positioning component for fixing the guide column and the supporting disc is arranged on the guide column, a plurality of metal balls are slidably penetrated in the rotating block, an arc groove for slidably matching with the metal balls is vertically provided in the rotating block, a first metal plate is penetrated at both ends of the inner wall of the arc groove, the first metal plate is symmetrically arranged about the axis of the arc groove, the end face of the first metal plate penetrating into the inner wall of the arc groove is flush with the inner wall of the arc groove, the first metal plate can abut against the outer peripheral surface of the metal ball, an indicator light is installed on the rotating block, and the first metal plate is electrically connected to the indicator lights respectively.

[0008] By adopting the above technical solution, the operator places the supporting disc close to the wall, and then the operator rotates the detection device body. The rotation of the detection device body drives the rotating block to rotate, and the rotation of the rotating block drives the guide column to slide in the guide ring groove. At this time, the metal ball rolls in the arc groove, and the metal balls at both ends of the arc groove remain flush in the horizontal direction; when the rotating block is not in a vertical state, the first metal plates at both ends cannot abut against the metal balls at the same time, and the operator continues to rotate the rotating block. When the rotating block is vertical, the metal balls at both ends abut against the first metal plates at both ends at the same time, and the indicator light on the rotating block lights up. Then the operator uses the positioning assembly to fix the rotating block, thereby facilitating the operator to adjust the verticality of the detection device, reducing the horizontal force of the detection device, and improving the accuracy of the device.

[0009] Preferably, the positioning assembly includes a positioning rod slidably inserted into the guide column and a positioning spring fixedly connected to the positioning rod, the end of the positioning rod passing through the guide column is provided with teeth, the inner bottom surface of the inner wall of the guide ring groove is provided with teeth, the teeth on the positioning rod are meshed with the teeth on the inner bottom surface of the guide ring groove, the positioning rod passes through the guide column and penetrates into the rotating block, the rotating block is provided with a positioning groove for sliding cooperation with the positioning rod, the end of the positioning spring away from the positioning rod is fixedly connected to the inner end surface of the positioning groove, and a fixing assembly for fixing the positioning rod is provided on the rotating block.

[0010] By adopting the above technical solution, the operator rotates the rotating block, and the rotation of the rotating block drives the back of the teeth on the positioning rod to slide on the back of the teeth in the guide ring groove. When the rotating tube is vertical, the operator uses the fixing component to fix the position of the positioning rod. At this time, the positioning rod engages with the teeth in the guide ring groove, thereby fixing the rotating block, making it convenient for the operator to observe the detection device.

[0011] Preferably, the fixed component includes a fixed gear rotatably installed in the rotating block, and a fixed rack slidably inserted into the rotating block. The end of the positioning rod that penetrates into the rotating block is provided with a tooth pattern, the tooth pattern on the positioning rod is meshed with the fixed gear, and the fixed gear is meshed with the fixed rack. The rotating block is provided with a fixed groove for slidingly cooperating with the fixed rack, and a control component for fixing the fixed rack is provided in the rotating block.

[0012] By adopting the above technical solution, when the axis of the rotating block is parallel to the vertical plane, the operator uses the control component to fix the fixed rack, and the fixed rack is fixed so that the fixed gear stops rotating, and the fixed gear stops rotating so that the positioning rod is fixed, thereby facilitating the operator to fix the rotating block.

[0013] Preferably, the control component includes a metal block fixedly connected to the fixed rack, an electromagnet installed on the inner end surface of the fixed slide groove, and the first metal plate is electrically connected to the electromagnet respectively.

[0014] By adopting the above technical solution, when the axis of the rotating block is parallel to the vertical plane, the metal balls at both ends of the arc groove abut against the first metal plates on both sides at the same time, thereby starting the electromagnet, making it convenient for the operator to fix the rotating block.

[0015] Preferably, an abutment rod is fixedly connected to the detection device body, and the abutment rod is slidably inserted into the rotating block, and the rotating block is provided with an abutment groove for slidingly cooperating with the abutment rod, and a second metal plate is fixedly connected to the end of the abutment rod passing through the transmission block, a third metal plate is inserted through the inner wall of one side of the abutment groove, and a fourth metal plate is inserted through the inner wall of the other side of the abutment groove, one end of the second metal plate can abut the third metal plate, and the other end of the second metal plate can abut the fourth metal plate, the first metal plate at one end of the arc groove is electrically connected to the third metal plate, the first metal plate at the other end of the arc groove is electrically connected to the electromagnet, and the fourth metal plate is electrically connected to the electromagnet.

[0016] By adopting the above technical solution, the operator presses the detection device, the movement of the detection device drives the abutment rod to move, the movement of the abutment rod drives the second metal plate to move, and the movement of the second metal plate makes the two ends of the second metal plate abut against the third metal plate and the fourth metal plate respectively, which makes it convenient for the operator to start the electromagnet and prevents the operator from accidentally touching the trigger indicator light.

[0017] Preferably, a return spring is fixedly connected to the second metal plate, and an end of the return spring away from the second metal plate is fixedly connected to an inner end surface of the abutting slide groove.

[0018] By adopting the above technical solution, when the operator is not using the monitoring device, the second metal plate is moved away from the third metal plate and the fourth metal plate under the action of the reset spring, thereby preventing the detection device from triggering the indicator light and the electromagnet during transportation, thereby improving the stability of the device.

[0019] Preferably, a snap-in slot is provided on the inner wall of the abutting slot, and the side wall of the second metal plate can be slidably matched with the inner wall of the snap-in slot.

[0020] By adopting the above technical solution, the setting of the clamping groove prevents the abutment rod from falling off.

[0021] Preferably, a limiting disc is fixedly sleeved on the guide column, and a limiting sliding groove for slidingly cooperating with the limiting disc is opened on the inner side wall of the guide ring groove.

[0022] By adopting the above technical solution, the setting of the limiting disc prevents the guide column from falling off.

[0023] Preferably, a ball is mounted on the limiting disc, and the ball rolls with the inner side wall of the limiting slide groove.

[0024] By adopting the above technical solution, the provision of the ball reduces the friction of the limiting disc, making the guide column slide more smoothly in the guide ring groove.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. The operator places the supporting disc close to the wall, and then the operator rotates the detection device body. The rotation of the detection device body drives the rotating block to rotate, and the rotation of the rotating block drives the guide column to slide in the guide ring groove. At this time, the metal ball rolls in the arc groove, and the metal balls at both ends of the arc groove remain flush in the horizontal direction; when the rotating block is not in a vertical state, the first metal plates at both ends cannot abut against the metal balls at the same time, and the operator continues to rotate the rotating block. When the rotating block is vertical, the metal balls at both ends abut against the first metal plates at both ends at the same time. At this time, the indicator light on the rotating block lights up, and then the operator uses the positioning component to fix the rotating block, so that the operator can adjust the verticality of the detection device conveniently, reduce the horizontal force of the detection device, and improve the accuracy of the device;

[0027] 2. The operator rotates the rotating block, and the rotation of the rotating block drives the back of the teeth on the positioning rod to slide on the back of the teeth in the guide ring groove. When the rotating tube is vertical, the operator uses the fixing component to fix the position of the positioning rod. At this time, the positioning rod is engaged with the teeth in the guide ring groove, thereby fixing the rotating block, which is convenient for the operator to observe the detection device;

[0028] 3. The operator presses the detection device, the movement of the detection device drives the abutment rod to move, the movement of the abutment rod drives the second metal plate to move, the movement of the second metal plate makes the two ends of the second metal plate abut against the third metal plate and the fourth metal plate respectively, which is convenient for the operator to start the electromagnet and prevents the operator from accidentally touching the trigger indicator light. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of a wall verticality detection device according to an embodiment of the present application.

[0030] Figure 2 It is a schematic diagram of the internal structure of a wall verticality detection device according to an embodiment of the present application.

[0031] Figure 3 yes Figure 2 A magnified schematic diagram of center A.

[0032] Figure 4 It is a schematic diagram of the internal structure of the rotating block of an embodiment of the present application.

[0033] Figure 5 yes Figure 4 A magnified schematic diagram of point B in the middle.

[0034] Description of reference numerals:

[0035] 1. Detection device body; 11. Abutment rod; 12. Second metal plate; 13. Reset spring; 14. Clamping slide; 2. Support disc; 21. Guide ring groove; 22. Limiting disc; 23. Limiting slide; 24. Ball; 3. Rotating block; 31. Guide column; 32. Metal ball; 33. Arc groove; 34. First metal plate; 35. Indicator light; 36. Abutment slide; 37. Third metal plate; 38. Fourth metal plate; 4. Positioning assembly; 41. Positioning rod; 42. Positioning spring; 43. Positioning slide; 5. Fixing assembly; 51. Fixed gear; 52. Fixed rack; 53. Fixed slide; 6. Control assembly; 61. Metal block; 62. Electromagnet. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-5 This application is described in further detail.

[0037] The present application embodiment discloses a wall verticality detection device. Figure 1 The verticality detection device comprises a detection device body 1, a rotating block 3, and a supporting disc 2. The detection device body 1 is vertically arranged, the rotating block 3 is mounted on the detection device body 1, the axis of the rotating block 3 coincides with the axis of the detection device body 1, and the supporting disc 2 is arranged on a side of the rotating block 3 away from the detection device body 1.

[0038] Reference Figure 2 , Figure 3 The two ends of the rotating block 3 near the side wall of the support disc 2 are fixedly connected with guide posts 31, the support disc 2 is provided with a guide ring groove 21 for slidingly cooperating with the guide posts 31, a limiting disc 22 is fixedly sleeved on the guide posts 31, the inner side wall of the guide ring groove 21 is provided with a limiting slide groove 23 for slidingly cooperating with the limiting disc 22, and a ball 24 is installed on the limiting disc 22, and the ball 24 rolls with the inner side wall of the limiting slide groove 23. The setting of the limiting disc 22 prevents the guide posts 31 from falling off, and the setting of the ball 24 reduces the friction of the limiting disc 22, so that the guide posts 31 slide more smoothly in the guide ring groove 21.

[0039] Reference Figure 2 , Figure 3 The guide column 31 is provided with a positioning assembly 4 for fixing the guide column 31 and the support disc 2. The positioning assembly 4 includes a positioning rod 41 and a positioning spring 42. The positioning rod 41 is arranged horizontally and is slidably inserted into the guide column 31. The end of the positioning rod 41 passing through the guide column 31 is provided with a tooth pattern. The inner bottom surface of the inner wall of the guide ring groove 21 is provided with a tooth pattern. The tooth pattern on the positioning rod 41 meshes with the tooth pattern on the inner bottom surface of the guide ring groove 21. The positioning rod 41 passes through the guide column 31 and penetrates into the rotating block 3. The rotating block 3 is provided with a positioning slot 43 for slidingly cooperating with the positioning rod 41. The end of the positioning spring 42 away from the positioning rod 41 is fixedly connected to the inner end surface of the positioning slot 43.

[0040] Reference Figure 3 The rotating block 3 is provided with a fixing assembly 5 for fixing the positioning rod 41, and the fixing assembly 5 includes a fixing gear 51 and a fixing rack 52. The fixing gear 51 is vertically arranged and rotatably mounted on the rotating block 3. The end of the positioning rod 41 that penetrates into the rotating block 3 is provided with a tooth pattern, and the tooth pattern on the positioning rod 41 meshes with the fixing gear 51. The fixing rack 52 is horizontally arranged and slidably penetrates into the rotating block 3. The rotating block 3 is provided with a fixing slot 53 for slidingly cooperating with the fixing rack 52, and the fixing rack 52 meshes with the fixing gear 51.

[0041] Reference Figure 3 A control assembly 6 for fixing the fixed rack 52 is arranged in the rotating block 3, and the control assembly 6 includes a metal block 61 and an electromagnet 62. The metal block 61 is arranged on the fixed rack 52, and the metal block 61 is fixedly connected to the end of the fixed rack 52 away from the supporting disk 2, and the electromagnet 62 is installed on the inner end surface of the fixed slide groove 53.

[0042] Reference Figure 4 , Figure 5A plurality of metal balls 32 are slidably inserted into the rotating block 3, and an arc groove 33 for slidingly cooperating with the metal balls 32 is vertically opened in the rotating block 3. Both ends of the inner wall of the arc groove 33 are penetrated with a first metal plate 34. The first metal plate 34 is symmetrically arranged about the axis of the arc groove 33, and the end surface of the first metal plate 34 inserted into the inner wall of the arc groove 33 is flush with the inner wall of the arc groove 33. The first metal plate 34 can abut against the outer peripheral surface of the metal ball 32, and the first metal plate 34 is electrically connected to the electromagnet 62 respectively. An indicator light 35 is installed on the rotating block 3, and the first metal plate 34 is electrically connected to the indicator light 35 respectively.

[0043] The operator places the supporting disc 2 close to the wall, and then the operator rotates the detection device body 1. The rotation of the detection device body 1 drives the rotating block 3 to rotate. The rotation of the rotating block 3 drives the guide column 31 to slide in the guide ring groove 21. At this time, the metal ball 32 rolls in the arc groove 33, and the metal balls 32 at both ends of the arc groove 33 remain flush in the horizontal direction; when the axis of the rotating block 3 is parallel to the vertical plane, the metal balls 32 at both ends simultaneously abut against the first metal plates 34 at both ends. At this time, the indicator light 35 on the rotating block 3 lights up, and the electromagnet 62 is started. The electromagnet 62 drives the fixed rack 52 to move through the metal block 61, and the fixed rack 52 drives the positioning rod 41 to engage with the tooth pattern in the guide ring groove 21 through the fixed gear 51, thereby fixing the rotating block 3, thereby facilitating the operator to adjust the verticality of the detection device, reducing the horizontal force of the detection device, and improving the accuracy of the device.

[0044] Reference Figure 2 , Figure 3 The detection device body 1 is fixedly connected with an abutting rod 11, which is slidably arranged on the rotating block 3. The rotating block 3 is provided with an abutting groove 36 for slidingly cooperating with the abutting rod 11. The end of the abutting rod 11 that penetrates into the transmission block is fixedly connected with a second metal plate 12, and a clamping groove 14 is arranged on the inner wall of the abutting groove 36. The side wall of the second metal plate 12 can slide and cooperate with the inner side wall of the clamping groove 14. The second metal plate 12 is fixedly connected with a return spring 13, and the end of the return spring 13 away from the second metal plate 12 is fixedly connected with the inner end surface of the abutting groove 36.

[0045] Reference Figure 2 , Figure 3, a third metal plate 37 is provided on the inner wall of one side of the abutting slide groove 36, and a fourth metal plate 38 is provided on the inner wall of the other side of the abutting slide groove 36. One end of the second metal plate 12 can abut against the third metal plate 37, and the other end of the second metal plate 12 can abut against the fourth metal plate 38. The first metal plate 34 at one end of the arc groove 33 is electrically connected to the third metal plate 37, and the first metal plate 34 at the other end of the arc groove 33 is electrically connected to the electromagnet 62, and the fourth metal plate 38 is electrically connected to the electromagnet 62. The operator presses the detection device, and the movement of the detection device drives the abutment rod 11 to move, and the movement of the abutment rod 11 drives the second metal plate 12 to move, and the movement of the second metal plate 12 makes the two ends of the second metal plate 12 abut against the third metal plate 37 and the fourth metal plate 38 respectively, so that the operator can start the electromagnet 62 conveniently and prevent the operator from accidentally touching the trigger indicator light 35.

[0046] The implementation principle of a wall verticality detection device in an embodiment of the present application is: the operator places the support disc 2 close to the wall, and then the operator presses the detection device body 1 to drive the abutment rod 11 to move, and the abutment rod 11 moves so that the two ends of the second metal plate 12 abut against the third metal plate 37 and the fourth metal plate 38 respectively.

[0047] Then the operator rotates the detection device body 1, and the detection device body 1 drives the guide column 31 to slide in the guide ring groove 21 through the rotating block 3. At this time, the metal ball 32 rolls in the arc groove 33, and the metal balls 32 at both ends of the arc groove 33 remain flush in the horizontal direction.

[0048] When the axis of the rotating block 3 is parallel to the vertical plane, the metal balls 32 at both ends abut against the first metal plates 34 at both ends at the same time. At this time, the indicator light 35 on the rotating block 3 lights up, and the electromagnet 62 is started. The electromagnet 62 absorbs the metal block 61 to fix the positioning rod 41, and the positioning rod 41 engages with the teeth in the guide ring groove 21, thereby fixing the rotating block 3, thereby facilitating the operator to adjust the verticality of the detection device, reducing the horizontal force of the detection device, and improving the accuracy of the device.

[0049] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A wall verticality detection device, comprising a detection device body (1), characterized in that: A support disc (2) is mounted on the detection device body (1), a rotating block (3) is arranged between the support disc (2) and the detection device body (1), both ends of the rotating block (3) close to the side wall of the support disc (2) are fixedly connected with guide posts (31), a guide ring groove (21) is provided on the support disc (2), the guide posts (31) are slidably matched with the guide ring groove (21), a positioning assembly (4) for fixing the guide posts (31) and the support disc (2) is arranged on the guide posts (31), a plurality of metal balls (32) are slidably penetrated in the rotating block (3), and the rotating block (3) is provided with a plurality of metal balls (32) which are slidably penetrated in the rotating block (3), and the rotating block (3) is provided with a plurality of metal balls (32) which are slidably penetrated in the rotating block (3). An arc groove (33) for slidingly cooperating with the metal ball (32) is vertically opened in the movable block (3), and first metal plates (34) are penetrated at both ends of the inner wall of the arc groove (33). The first metal plates (34) are symmetrically arranged about the axis of the arc groove (33). The end surface of the first metal plate (34) that penetrates into the inner wall of the arc groove (33) is flush with the inner wall of the arc groove (33). The first metal plate (34) can abut against the outer peripheral surface of the metal ball (32). An indicator light (35) is installed on the rotating block (3), and the first metal plates (34) are respectively electrically connected to the indicator lights (35).

2. A wall verticality detection device according to claim 1, characterized in that: The positioning assembly (4) comprises a positioning rod (41) slidably inserted into the guide column (31) and a positioning spring (42) fixedly connected to the positioning rod (41); a tooth pattern is arranged on the end of the positioning rod (41) passing through the guide column (31); a tooth pattern is arranged on the inner bottom surface of the inner wall of the guide ring groove (21); the tooth pattern on the positioning rod (41) meshes with the tooth pattern on the inner bottom surface of the guide ring groove (21); the positioning rod (41) passes through the guide column (31) and enters the rotating block (3); a positioning groove (43) for slidingly cooperating with the positioning rod (41) is provided in the rotating block (3); the end of the positioning spring (42) away from the positioning rod (41) is fixedly connected to the inner end surface of the positioning groove (43); and a fixing assembly (5) for fixing the positioning rod (41) is arranged on the rotating block (3).

3. A wall verticality detection device according to claim 2, characterized in that: The fixing assembly (5) comprises a fixing gear (51) rotatably mounted in the rotating block (3) and a fixing rack (52) slidably inserted into the rotating block (3); a tooth pattern is arranged on the end of the positioning rod (41) that penetrates into the rotating block (3); the tooth pattern on the positioning rod (41) meshes with the fixing gear (51); the fixing gear (51) meshes with the fixing rack (52); a fixing groove (53) for slidingly cooperating with the fixing rack (52) is provided on the rotating block (3); and a control assembly (6) for fixing the fixing rack (52) is arranged in the rotating block (3).

4. A wall verticality detection device according to claim 3, characterized in that: The control assembly (6) comprises a metal block (61) fixedly connected to the fixed rack (52), an electromagnet (62) installed on the inner end surface of the fixed slide groove (53), and the first metal plate (34) is electrically connected to the electromagnet (62) respectively.

5. A wall verticality detection device according to claim 4, characterized in that: The detection device body (1) is fixedly connected with an abutment rod (11), the abutment rod (11) is slidably inserted into the rotating block (3), the rotating block (3) is provided with an abutment groove (36) for slidingly cooperating with the abutment rod (11), the end of the abutment rod (11) inserted into the rotating block (3) is fixedly connected with a second metal plate (12), the inner wall of one side of the abutment groove (36) is penetrated with a third metal plate (37), and the inner wall of the other side of the abutment groove (36) is provided with a third metal plate (37). A fourth metal plate (38) is penetrated, one end of the second metal plate (12) can abut against the third metal plate (37), the other end of the second metal plate (12) can abut against the fourth metal plate (38), the first metal plate (34) at one end of the arc groove (33) is electrically connected to the third metal plate (37), the first metal plate (34) at the other end of the arc groove (33) is electrically connected to the electromagnet (62), and the fourth metal plate (38) is electrically connected to the electromagnet (62).

6. A wall verticality detection device according to claim 5, characterized in that: A return spring (13) is fixedly connected to the second metal plate (12), and an end of the return spring (13) away from the second metal plate (12) is fixedly connected to an inner end surface of the abutting slide groove (36).

7. A wall verticality detection device according to claim 5, characterized in that: A clamping slide groove (14) is provided on the inner wall of the abutting slide groove (36), and the side wall of the second metal plate (12) can be slidably matched with the inner wall of the clamping slide groove (14).

8. A wall verticality detection device according to claim 1, characterized in that: A limiting disc (22) is fixedly sleeved on the guide column (31), and a limiting sliding groove (23) for slidingly cooperating with the limiting disc (22) is provided on the inner side wall of the guide ring groove (21).

9. A wall verticality detection device according to claim 8, characterized in that: A ball (24) is mounted on the limiting disc (22), and the ball (24) is in rolling engagement with the inner side wall of the limiting sliding groove (23).

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