Broken bridge aluminum door and window convenient to clean
By designing the structure of cleaning blocks, round holes, rectangular rods, dust removal blocks and springs inside the frames of broken bridge aluminum doors and windows, the problem of inconvenient cleaning of door and window frame grooves in the prior art is solved, efficient cleaning of dirt is achieved, and the convenience of cleaning of doors and windows is improved.
Patent Information
- Application Number
- CN202421627404.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-10
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-07-10
AI Technical Summary
During the use of existing broken bridge aluminum doors and windows, the groove design inside the frame is inconvenient to clean, resulting in dirt accumulation affecting opening and closing.
A structure including a cleaning block, a circular hole, a rectangular rod, a dust removal block and a spring is designed. When pushing the push block, the cleaning block moves along the inner surface of the lower long strip, the hemiscum rod is squeezed, compressing the spring, pushing the dirt to the dust removal block, pushing the dust removal block to move along the rectangular rod, compressing the second spring, and cleaning the dirt.
It realizes convenient cleaning of dirt inside long strips under broken bridge aluminum doors and windows, and improves the cleaning convenience of doors and windows.
Smart Images
Figure CN222853770U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of thermally-broken aluminum doors and windows, and in particular to a thermally-broken aluminum door and window which is easy to clean. Background Art
[0002] The broken bridge aluminum doors and windows are made of thermal insulation broken bridge aluminum profiles and hollow glass, with energy saving, sound insulation, noise prevention, dustproof, waterproof and other functions. According to the opening method, they are divided into: fixed windows, top-hung windows, middle-hung windows, bottom-hung windows, vertical-rotating windows, casement doors and windows, pulley windows, casement bottom-hung doors and windows, sliding casement windows, folding doors, lifting and sliding doors, sliding and folding doors, and inward-tilted side sliding doors; according to performance, they are divided into: ordinary doors and windows, sound insulation doors and windows, and thermal insulation doors and windows; according to the application parts, they are divided into: interior doors and windows, and exterior doors and windows.
[0003] With the development of science and technology and the progress of society, people have higher and higher requirements for living standards, and thermally-insulated aluminum doors and windows are becoming more and more popular due to their superior performance. However, in the actual use of existing thermally-insulated aluminum doors and windows, since the bottom end of the inner side of the thermally-insulated aluminum door and window frame is provided with a groove for the movement of the door and window main body hinges, when the door and window are opened, dust, small particles, stones and other debris from the outside will enter the inside of the groove. At the same time, due to the concave design of the groove, the groove is not easy to clean. When too much dirt accumulates, it will affect the opening and closing of the doors and windows, so it is necessary to improve this. Utility Model Content
[0004] The utility model provides a thermally-insulated aluminum door and window which is easy to clean, thereby solving the problem of inconvenient cleaning in the related art.
[0005] The technical scheme of the utility model is as follows: a kind of broken bridge aluminum door and window which is convenient to clean, comprises a frame, an upper strip and a lower strip are fixedly installed at the upper and lower ends of the frame respectively, a cleaning block is movably sleeved on the left side of the interior of the lower strip, a push block is fixedly installed on the top of the cleaning block, the bottom end of the push block is movably connected to the top of the lower strip, a round hole is opened at the bottom end of the cleaning block, a hemispherical rod is movably sleeved inside the round hole, the bottom end of the hemispherical rod passes through the lower strip and extends to the interior of the lower strip and is fixedly installed with a first spring, the bottom end of the first spring is fixedly connected to the inner surface of the lower strip, a fixing plate is fixedly installed at the bottom of the right side of the front end of the lower strip, a rectangular rod is fixedly installed at the middle part of the left end of the fixing plate, a baffle is fixedly sleeved on the left side of the outer surface of the rectangular rod, a dust removal block is movably sleeved on the right side of the outer surface of the rectangular rod, the outer surface of the dust removal block is movably sleeved on the right inner wall of the lower strip, a second spring located outside the rectangular rod is fixedly installed on the left end of the dust removal block, and the other end of the second spring is fixedly connected to the right end of the baffle.
[0006] As a preferred embodiment of the utility model, a door and window body is hinged on the left side inside the frame, the upper and lower sides of the outer surface of the door and window body are movably connected to the outer surfaces of the upper and lower strips respectively, and a handle is movably installed in the middle of the right side of the front end of the door and window body.
[0007] As a preferred embodiment of the present invention, an inner glass is fixedly sleeved on the left side inside the door and window main body, and an outer glass is fixedly sleeved on the right side inside the door and window main body.
[0008] As a preferred embodiment of the utility model, outer brackets are fixedly installed on the left and right sides of the top of the outer glass respectively, an outer scraper is movably sleeved on the top inside the outer bracket, the left end of the outer scraper is movably connected to the right end of the outer glass, an outer magnetic strip is fixedly installed on the top of the outer scraper, and the outer surface of the outer magnetic strip is movably connected to the outer surface of the outer glass.
[0009] As a preferred embodiment of the utility model, an inner bracket is fixedly installed on the front side of the left end of the inner glass, an inner scraper is movably sleeved on the top end inside the inner bracket, the right end of the inner scraper is movably connected to the left end of the inner glass, an inner magnetic strip is fixedly installed on the top end of the inner scraper, and the right end of the inner magnetic strip is movably connected to the left end of the inner glass.
[0010] As a preferred embodiment of the utility model, the left ends of the inner scraper and the inner magnetic strip are fixedly installed with rectangular blocks, the rear end of the rectangular block and the front end of the inner glass are movably connected, the interior of the rectangular block is movably sleeved with a limit rod, and the limit rod is fixedly sleeved on the left side inside the door and window body.
[0011] As a preferred embodiment of the present invention, a first fixing block is fixedly installed at the bottom of the left side of the front end of the door and window body, and a first circular shaft is movably sleeved inside the first fixing block.
[0012] As a preferred embodiment of the utility model, a handle is fixedly sleeved on the left end of the first circular shaft, and the right end of the handle is movably connected to the left end of the first fixed block; a driving wheel is fixedly sleeved on the right end of the first circular shaft, and the left end of the driving wheel is movably connected to the right end of the first fixed block.
[0013] As a preferred embodiment of the utility model, a second fixed block is fixedly installed on the top of the left side of the front end of the door and window main body, a second circular shaft is fixedly sleeved inside the second fixed block, a driven wheel is movably sleeved on the right side of the outer surface of the second circular shaft, the left end of the driven wheel is movably connected to the right end of the second fixed block, and the driven wheel is connected to the driving wheel through a transmission belt.
[0014] As a preferred embodiment of the utility model, a slide groove is provided on the front side of the left end of the rectangular block, a push rod is movably sleeved inside the slide groove, and the left side of the bottom end of the push rod is fixedly connected to the outer surface of the transmission belt.
[0015] The beneficial effects of the utility model are:
[0016] 1. The utility model provides a cleaning block, a round hole, a rectangular rod, a dust removal block, and a second spring. When the pushing block is pushed, the cleaning block will move along the inner surface of the lower strip, so that the inner wall of the round hole squeezes the hemispherical rod, and then the hemispherical rod moves and compresses the first spring. When the dirt inside the lower strip is pushed to the other side of the lower strip, the dust removal block is pushed, which will move along the outer surface of the rectangular rod and compress the second spring, thereby pushing the dirt out of the lower strip. In this way, the dirt inside the lower strip can be cleaned, thereby improving the convenience of cleaning the thermal insulation aluminum doors and windows.
[0017] 2. The utility model is provided with an outer scraper, an outer magnetic strip, an inner scraper, an inner magnetic strip and a limit rod. When the handle is turned, the first circular shaft will drive the driving wheel to rotate. Since the driving wheel and the driven wheel are connected by a transmission belt, the transmission belt will move with the push rod, so that the push rod pushes the rectangular block to move downward along the outer surface of the limit rod. The inner magnetic strip and the outer magnetic strip are attracted to each other due to their own magnetism, so the inner scraper and the outer scraper will move downward along the outer surfaces of the inner glass and the outer glass respectively, so as to realize the cleaning of the inner and outer glass of the thermally-broken aluminum doors and windows. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0019] Figure 1 It is a schematic diagram of the structure of the utility model;
[0020] Figure 2 It is a schematic diagram of the cross-sectional structure of the front side of the utility model;
[0021] Figure 3 It is a cross-sectional structural schematic diagram of the side of the utility model;
[0022] Figure 4 It is a cross-sectional structural schematic diagram of the bottom of the utility model;
[0023] Figure 5 It is a schematic cross-sectional structure diagram of the first circular shaft of the utility model;
[0024] Figure 6 It is a cross-sectional structural schematic diagram of the outer scraper of the utility model;
[0025] Figure 7 It is a structural schematic diagram of the lower strip of the utility model;
[0026] Figure 8 for Figure 2 A schematic diagram of the local enlarged structure at point A in the middle;
[0027] Fig. 9 for Figure 2 A schematic diagram of the local enlarged structure at B in the middle;
[0028] Fig.10 for Figure 5 A schematic diagram of the local enlarged structure at C in the middle;
[0029] Fig.11 for Figure 5 A schematic diagram of the local enlarged structure at D in the middle;
[0030] Fig.12 for Figure 6 A schematic diagram of the local enlarged structure at E in the middle;
[0031] Fig.13 for Figure 7 Schematic diagram of the local enlarged structure at F in the middle.
[0032] In the figure: 1. frame; 2. upper strip; 3. lower strip; 4. cleaning block; 5. push block; 6. round hole; 7. hemispherical rod; 8. first spring; 9. fixed plate; 10. rectangular rod; 11. baffle; 12. dust removal block; 13. second spring; 14. door and window body; 15. handle; 16. inner glass; 17. outer glass; 18. outer bracket; 19. outer scraper; 20. outer magnetic strip; 21. inner bracket; 22. inner scraper; 23. inner magnetic strip; 24. rectangular block; 25. limit rod; 26. first fixed block; 27. first circular shaft; 28. handle; 29. driving wheel; 30. second fixed block; 31. second circular shaft; 32. driven wheel; 33. transmission belt; 34. slide groove; 35. push rod. DETAILED DESCRIPTION
[0033] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0034] like Figures 1 to 13As shown, the utility model provides a conveniently cleaned broken bridge aluminum door and window, comprising a frame 1, wherein an upper strip 2 and a lower strip 3 are respectively fixedly installed at the upper and lower ends of the frame 1, a cleaning block 4 is movably sleeved on the left side of the interior of the lower strip 3, a push block 5 is fixedly installed on the top of the cleaning block 4, the bottom end of the push block 5 is movably connected to the top of the lower strip 3, a round hole 6 is opened at the bottom end of the cleaning block 4, a semi-spherical rod 7 is movably sleeved inside the round hole 6, the bottom end of the semi-spherical rod 7 passes through the lower strip 3 and extends to the interior of the lower strip 3 and is fixedly installed with a first spring 8, the first spring The bottom end of the spring 8 is fixedly connected to the inner surface of the lower long strip 3, a fixing plate 9 is fixedly installed on the bottom of the right side of the front end of the lower long strip 3, a rectangular rod 10 is fixedly installed in the middle of the left end of the fixing plate 9, a baffle 11 is fixedly sleeved on the left side of the outer surface of the rectangular rod 10, a dust removal block 12 is movably sleeved on the right side of the outer surface of the rectangular rod 10, the outer surface of the dust removal block 12 is movably sleeved on the right inner wall of the lower long strip 3, a second spring 13 located outside the rectangular rod 10 is fixedly installed on the left end of the dust removal block 12, and the other end of the second spring 13 is fixedly connected to the right end of the baffle 11.
[0035] When the push block 5 is pushed, the cleaning block 4 will move along the inner surface of the lower strip 3. At this time, the inner surface of the circular hole 6 will squeeze the hemispherical rod 7, causing the hemispherical rod 7 to move downward and compress the first spring 8. As the cleaning block 4 moves, the dirt inside the lower strip 3 will be pushed to the front side of the dust removal block 12. At this time, pushing the dust removal block 12 will cause the dust removal block 12 to move along the outer surface of the rectangular rod 10 and compress the second spring 13, thereby pushing the dirt out of the lower strip 3. In this way, the dirt inside the lower strip 3 can be cleaned, thereby improving the convenience of cleaning the broken bridge aluminum doors and windows.
[0036] refer to Figures 1 to 6 , Figures 8 to 11 A door and window body 14 is hinged on the left side inside the frame 1, and the upper and lower sides of the outer surface of the door and window body 14 are movably connected to the outer surfaces of the upper strip 2 and the lower strip 3 respectively. A handle 15 is movably installed in the middle of the right side of the front end of the door and window body 14.
[0037] As a technical optimization solution of the present invention, when the handle 15 is rotated, the door and window body 14 will be opened.
[0038] refer to Figures 1 to 6 , Figure 8 , Figures 10 to 12 An inner glass 16 is fixedly sleeved on the left side of the door and window main body 14 , and an outer glass 17 is fixedly sleeved on the right side of the door and window main body 14 .
[0039] As a technical optimization solution of the utility model, a cavity will be formed between the inner glass 16 and the outer glass 17, thereby improving the sound insulation and heat insulation effect of the thermally-insulated aluminum doors and windows.
[0040] refer to Figure 3 , Figure 4 , Figure 6 and Fig.12 An outer bracket 18 is fixedly installed on the left and right sides of the top of the outer glass 17 respectively, an outer scraper 19 is movably sleeved on the top inside the outer bracket 18, the left end of the outer scraper 19 is movably connected to the right end of the outer glass 17, an outer magnetic strip 20 is fixedly installed on the top of the outer scraper 19, and the outer surface of the outer magnetic strip 20 is movably connected to the outer surface of the outer glass 17.
[0041] As a technical optimization solution of the utility model, when the outer magnetic strip 20 moves along the inner surface of the outer bracket 18 with the outer scraper 19, the outer surface of the outer glass 17 will be cleaned.
[0042] refer to Figures 1 to 6 , Figure 8 , Fig.10 and Fig.12 An inner bracket 21 is fixedly installed on the front side of the left end of the inner glass 16, and an inner scraper 22 is movably sleeved on the top end inside the inner bracket 21. The right end of the inner scraper 22 is movably connected to the left end of the inner glass 16. An inner magnetic strip 23 is fixedly installed on the top end of the inner scraper 22. The right end of the inner magnetic strip 23 is movably connected to the left end of the inner glass 16.
[0043] As a technical optimization solution of the present invention, when the inner scraper 22 moves along the inner surface of the inner bracket 21 , the outer surface of the inner glass 16 will be cleaned.
[0044] refer to Figure 1 , Figure 2 , Figures 4 to 6 , Figure 8 , Fig.10 and Fig.11 A rectangular block 24 is fixedly installed on the left ends of the inner scraper 22 and the inner magnetic strip 23. The rear end of the rectangular block 24 is movably connected to the front end of the inner glass 16. A limit rod 25 is movably sleeved inside the rectangular block 24. The limit rod 25 is fixedly sleeved on the left side inside the door and window body 14.
[0045] As a technical optimization solution of the utility model, when the rectangular block 24 moves along the outer surface of the limiting rod 25, it will move with the inner scraper 22 and the inner magnetic strip 23.
[0046] refer to Figure 1 , Figure 5 and Fig.11 A first fixing block 26 is fixedly installed at the bottom of the left side of the front end of the door and window body 14, and a first circular shaft 27 is movably sleeved inside the first fixing block 26.
[0047] As a technical optimization solution of the present invention, the first fixing block 26 and the first circular shaft 27 play a supporting role.
[0048] refer to Figure 5 , Figure 6 and Fig.11 A handle 28 is fixedly sleeved on the left end of the first circular shaft 27, and the right end of the handle 28 is movably connected to the left end of the first fixed block 26. A driving wheel 29 is fixedly sleeved on the right end of the first circular shaft 27, and the left end of the driving wheel 29 is movably connected to the right end of the first fixed block 26.
[0049] As a technical optimization solution of the utility model, when the handle 28 is turned, the first circular shaft 27 will drive the driving wheel 29 to rotate along the inner surface of the first fixing block 26 .
[0050] refer to Figure 1 , Figures 4 to 6 , Fig.10 and Fig.11 A second fixed block 30 is fixedly installed on the top of the left front end of the door and window body 14, a second circular shaft 31 is fixedly sleeved inside the second fixed block 30, a driven wheel 32 is movably sleeved on the right side of the outer surface of the second circular shaft 31, the left end of the driven wheel 32 is movably connected to the right end of the second fixed block 30, and the driven wheel 32 is transmission-connected to the driving wheel 29 through a transmission belt 33.
[0051] As a technical optimization solution of the utility model, since the driven wheel 32 is connected to the driving wheel 29 through the transmission belt 33, when the driving wheel 29 rotates, the transmission belt 33 will rotate.
[0052] refer to Figure 5 and Fig.10 A slide groove 34 is provided on the front side of the left end of the rectangular block 24 , and a push rod 35 is movably sleeved inside the slide groove 34 . The left side of the bottom end of the push rod 35 is fixedly connected to the outer surface of the transmission belt 33 .
[0053] As a technical optimization solution of the utility model, when the transmission belt 33 rotates, it will drive the push rod 35 to move together, so that the outer surface of the push rod 35 generates a thrust on the inner surface of the slide groove 34, thereby pushing the rectangular block 24 to move.
[0054] The working principle and use process of this utility model:
[0055] First, when cleaning the lower strip 3, the operator pushes the push block 5, so that the cleaning block 4 moves along the inner surface of the lower strip 3, thereby pushing the dirt to the other side of the lower strip 3. As the cleaning block 4 moves, the inner wall of the circular hole 6 will squeeze the hemispherical rod 7, causing the hemispherical rod 7 to move downward and compress the first spring 8, thereby releasing the lock of the hemispherical rod 7 on the cleaning block 4. When the dirt is pushed to the front side of the dust removal block 12, the operator pushes the dust removal block 12, so that the dust removal block 12 moves along the outer surface of the rectangular rod 10 and compresses the second spring 13, thereby pushing the dirt away from the inside of the lower strip 3, and then releases the dust removal block 12. Under the restoring action of the second spring 13, the dust removal block 12 will return to its original position, thereby realizing the cleaning of the dirt inside the lower strip 3, thereby improving the convenience of cleaning the thermal insulation aluminum doors and windows.
[0056] The operator then turns the handle 28, causing the first circular shaft 27 to drive the driving wheel 29 to rotate. Since the driving wheel 29 is connected to the driven wheel 32 through the transmission belt 33, the transmission belt 33 will rotate with the push rod 35 under the joint action of the driving wheel 29 and the driven wheel 32. Since the push rod 35 is movably sleeved on the inner surface of the slide groove 34 and the slide groove 34 is opened inside the rectangular block 24, under the action of the push rod 35, the rectangular block 24 will move along the outer surface of the limit rod 25 with the inner magnetic strip 23 and the inner scraper 22. At the same time, the inner magnetic strip 23 and the outer magnetic strip 20 attract each other due to their opposite magnetic properties, so the outer scraper 19 will move along the inner surface of the outer bracket 18 under the drive of the outer magnetic strip 20. At this time, the outer surfaces of the inner glass 16 and the outer glass 17 will be cleaned by the inner scraper 22 and the outer scraper 19, so that the inner and outer glass of the thermally-broken aluminum doors and windows can be cleaned simultaneously.
[0057] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A thermally-insulated aluminum door and window that is easy to clean, comprising a frame (1), characterized in that: An upper strip (2) and a lower strip (3) are fixedly mounted at the upper and lower ends of the frame (1), respectively; a cleaning block (4) is movably sleeved on the left side of the interior of the lower strip (3); a push block (5) is fixedly mounted on the top of the cleaning block (4); the bottom end of the push block (5) is movably connected to the top of the lower strip (3); a circular hole (6) is provided at the bottom end of the cleaning block (4); a hemispherical rod (7) is movably sleeved inside the circular hole (6); the bottom end of the hemispherical rod (7) passes through the lower strip (3) and extends to the interior of the lower strip (3) and is fixedly mounted with a first spring (8); the bottom end of the first spring (8) is movably sleeved to the top of the lower strip (3); ), a fixing plate (9) is fixedly mounted on the bottom of the right side of the front end of the lower long strip (3), a rectangular rod (10) is fixedly mounted on the middle of the left end of the fixing plate (9), a baffle (11) is fixedly sleeved on the left side of the outer surface of the rectangular rod (10), a dust removal block (12) is movably sleeved on the right side of the outer surface of the rectangular rod (10), the outer surface of the dust removal block (12) is movably sleeved on the right side inner wall of the lower long strip (3), a second spring (13) located outside the rectangular rod (10) is fixedly mounted on the left end of the dust removal block (12), and the other end of the second spring (13) is fixedly connected to the right end of the baffle (11).
2. The easy-to-clean thermally-insulated aluminum door and window according to claim 1 is characterized by: A door and window body (14) is hingedly connected to the left side of the interior of the frame (1); the upper and lower sides of the outer surface of the door and window body (14) are movably connected to the outer surfaces of the upper strip (2) and the lower strip (3) respectively; and a handle (15) is movably mounted in the middle of the right side of the front end of the door and window body (14).
3. The easy-to-clean broken bridge aluminum door and window according to claim 2 is characterized by: An inner glass (16) is fixedly sleeved on the left side of the door and window main body (14), and an outer glass (17) is fixedly sleeved on the right side of the door and window main body (14).
4. The easy-to-clean broken bridge aluminum door and window according to claim 3 is characterized by: An outer bracket (18) is fixedly mounted on the left and right sides of the top of the outer glass (17), respectively; an outer scraper (19) is movably sleeved on the top of the inner part of the outer bracket (18); the left end of the outer scraper (19) is movably connected to the right end of the outer glass (17); an outer magnetic strip (20) is fixedly mounted on the top of the outer scraper (19); and the outer surface of the outer magnetic strip (20) is movably connected to the outer surface of the outer glass (17).
5. The easy-to-clean thermally-insulated aluminum door and window according to claim 3 is characterized by: An inner bracket (21) is fixedly mounted on the front side of the left end of the inner glass (16); an inner scraper (22) is movably sleeved on the top end of the inner bracket (21); the right end of the inner scraper (22) is movably connected to the left end of the inner glass (16); an inner magnetic strip (23) is fixedly mounted on the top end of the inner scraper (22); and the right end of the inner magnetic strip (23) is movably connected to the left end of the inner glass (16).
6. The easy-to-clean broken bridge aluminum door and window according to claim 5 is characterized by: A rectangular block (24) is fixedly mounted on the left ends of the inner scraper (22) and the inner magnetic strip (23); the rear end of the rectangular block (24) is movably connected to the front end of the inner glass (16); a limit rod (25) is movably sleeved inside the rectangular block (24); and the limit rod (25) is fixedly sleeved on the left side inside the door and window body (14).
7. The easy-to-clean thermally-insulated aluminum door and window according to claim 2 is characterized by: A first fixing block (26) is fixedly mounted on the bottom of the left front end of the door and window body (14), and a first circular shaft (27) is movably sleeved inside the first fixing block (26).
8. The easy-to-clean broken bridge aluminum door and window according to claim 7 is characterized by: A handle (28) is fixedly sleeved on the left end of the first circular shaft (27), and the right end of the handle (28) is movably connected to the left end of the first fixed block (26). A driving wheel (29) is fixedly sleeved on the right end of the first circular shaft (27), and the left end of the driving wheel (29) is movably connected to the right end of the first fixed block (26).
9. The easy-to-clean broken bridge aluminum door and window according to claim 2 is characterized by: A second fixing block (30) is fixedly mounted on the top of the left front end of the door and window body (14); a second circular shaft (31) is fixedly sleeved inside the second fixing block (30); a driven wheel (32) is movably sleeved on the right side of the outer surface of the second circular shaft (31); the left end of the driven wheel (32) is movably connected to the right end of the second fixing block (30); and the driven wheel (32) is transmission-connected to the driving wheel (29) via a transmission belt (33).
10. The easy-to-clean thermally-insulated aluminum door and window according to claim 6, characterized in that: A slide groove (34) is provided at the front side of the left end of the rectangular block (24), a push rod (35) is movably sleeved inside the slide groove (34), and the left side of the bottom end of the push rod (35) is fixedly connected to the outer surface of the transmission belt (33).