Concrete maintenance device for building construction

By designing the concrete maintenance device of the valve mechanism and heating mechanism, the problem of heat loss is solved, efficient water heating and steam output is achieved, and the practicality of the device is improved.

CN223278214UActive Publication Date: 2025-08-29ZHEJIANG ZHONGRUI ARCHITECTURE ENG CO LTD
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Patent Information

Application Number
CN202421972118.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-08-15
Publication Date
2025-08-29
Estimated Expiration
2034-08-15

AI Technical Summary

Technical Problem

The existing concrete maintenance devices have severe heat loss during the heating process, which affects the steam output efficiency and is inconvenient to use.

Method used

A concrete maintenance device including a valve mechanism and a heating mechanism is designed to control steam emissions through a sealing plate and a synchronous wheel system, combined with the design of hollow shafts and fan blades to improve heating efficiency and reduce heat loss.

Benefits of technology

It effectively improves the heating efficiency of water and steam output efficiency, reduces heat loss, is more convenient to use and more practical.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a concrete maintenance device for building construction, particularly relates to the technical field of concrete maintenance, and comprises a box body, a water inlet pipe is arranged on one side of the upper part of the box body, a water drainage pipe is arranged on one side of the lower part of the box body, and the top of the box body is detachably connected with a box cover. The first fan blade is continuously driven to rotate to suck air and pass through the partition plates, one part flows between the partition plates, the other part impacts the air between the partition plates after passing through the buffer groove, the speed of the air is reduced, the residence time is prolonged, the heating temperature is higher, heat can be transferred while water is stirred, the heating effect is improved, and the steam output efficiency is improved; when water is heated, the steam exhaust port is closed, and after the water is heated to a certain temperature, the air pressure in the box body is increased, so that the steam exhaust port is opened, steam is exhausted, heat loss is reduced, the heating effect is improved, and the practicability is higher; and the inner wall of the box body can be cleaned and scraped through a supporting rod, a supporting ring and a scraping plate.
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Description

Technical Field

[0001] The utility model relates to the technical field of concrete maintenance, in particular to a concrete maintenance device for building construction. Background Art

[0002] Concrete curing is the process of artificially creating certain humidity and temperature conditions so that the newly poured concrete can harden and increase its strength normally or at an accelerated rate. The gradual hardening and strength increase of concrete is the result of cement hydration, and cement hydration requires certain temperature and humidity conditions. If these conditions do not exist in the surrounding environment, the concrete must be artificially cured. The concrete curing methods include: natural curing and steam curing.

[0003] The patent library discloses a concrete maintenance device for construction (authorization announcement number CN219732841U), which includes a barrel body, a stirring mechanism and a blowing mechanism. Multiple heating rods are installed inside the barrel body. The stirring mechanism includes a vertical shaft and blades. The vertical shaft is located inside the barrel body and is rotatably connected to the barrel body. Multiple blades are fixedly connected to the vertical shaft. The blowing mechanism includes a bellows, a rotating shaft and fan blades. The bellows is fixedly connected to the upper end surface of the barrel body. Multiple rotating shafts are rotatably connected inside the bellows, and fan blades are fixedly connected to the multiple rotating shafts. The vertical shaft can drive the blades to rotate, and the blades stir the water in the barrel body, thereby improving the steam generation efficiency. The rotating shaft can drive the fan blades to rotate. The fan blades draw air through the air inlet and blow it out through the air outlet, thereby blowing away the steam floating out from the upper end of the steam pipe, thereby accelerating the steam dispersion speed in the room.

[0004] During use, the above-mentioned equipment for concrete maintenance improves the efficiency of water heating and steam production by stirring the water. However, the steam pipe is arranged with a large opening. When heating the water, some heat will be dissipated through the steam pipe opening, resulting in heat loss, affecting the water heating efficiency and further affecting the steam production efficiency. It is inconvenient to use and has relatively poor practicality. Utility Model Content

[0005] The purpose of the present utility model is to provide a concrete maintenance device for construction to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions: a concrete maintenance device for construction construction, comprising a box body, a water inlet pipe is provided on one side of the upper part of the box body, and a drain pipe is provided on one side of the lower part of the box body, the top of the box body is detachably connected to the box cover, the top side of the box cover is provided with a steam exhaust port, and a valve mechanism is provided in the steam exhaust port, a hollow shaft is rotatably installed in the box body, a pair of hollow blades are provided on the side walls of the hollow shaft, a docking block is embedded and installed on the upper end of the hollow shaft, a motor is provided on the top of the box cover, and the output end of the motor is fixedly connected to the docking block, a heating rod is symmetrically provided on the outer side of the hollow blades at the bottom of the box body, a heating mechanism connected to the hollow shaft is provided at the bottom of the box body, a fan cylinder is provided on one side of the top of the box cover, and a transmission rod is rotatably installed in the fan cylinder, the upper end of the transmission rod is connected to the fan blade 2, the lower end of the transmission rod and the outer side of the motor output end are both sleeved with a synchronous wheel 2, and the synchronous wheels 2 are connected by a synchronous belt 2.

[0007] Furthermore, the valve mechanism includes a connecting cylinder, which is arranged in the exhaust port, and the lower end of the connecting cylinder is threadedly connected to the exhaust port, a fixing block is fixedly installed in the connecting cylinder, and a through groove is opened on the top of the fixing block, a sealing plate is provided on the upper part of the through groove, and a bracket is provided under the fixing block, and a guide rod is provided at the bottom of the bracket, and the upper end of the guide rod is fixedly connected to the sealing plate, and the lower end of the guide rod is connected to the limiting plate, and a spring is provided on the outside of the guide rod to the limit plate and the outside of the bracket. The setting of the valve mechanism can block the exhaust port when the water is first heated to avoid heat loss. When the water in the box is heated to a certain degree and its internal pressure reaches a certain level, the sealing plate will be separated from the fixed block, and the exhaust port will be opened. When steam is generated, the steam will be discharged into the surrounding space through the exhaust port, avoiding heat loss at the beginning of heating, affecting the efficiency of steam generation by water heating, and more practical.

[0008] Furthermore, the heating mechanism includes an air duct, and the air duct is fixedly installed at the bottom of the box body, one end of the air duct is rotatably connected to the lower end of the hollow shaft through a connecting head, and a rotating shaft is rotatably installed on the top of the air duct, and a synchronous wheel 1 is sleeved on the outside of the rotating shaft and the hollow shaft, and the synchronous wheels 1 are connected by a synchronous belt 1, and the lower end of the rotating shaft is connected to a bevel gear 1 in the air duct, and a rotating rod is rotatably installed below the bevel gear 1, and a bevel gear 2 meshing with the bevel gear 1 is sleeved on the outside of the rotating rod, and a fan blade 1 is connected to one end of the rotating rod, and three partitions are sequentially provided on the side of the fan blade 1 away from the rotating rod in the air duct, and an opening is opened on one side of the partition, and the openings on several partitions It is distributed in a bottom-up-bottom form, and a number of buffer grooves are provided on the same side of the two partitions on the right side, and a guide plate is provided on one side of the opening below the buffer groove. The directions of the buffer grooves on the two partitions on the right side are opposite, and a number of heating rods 2 are provided between adjacent partitions, and the heating rods 2 are located between the upper and lower adjacent guide plates. Exhaust holes are symmetrically provided on the upper side wall of the hollow shaft. The heating mechanism can be linked with the hollow shaft to drive the fan blades to rotate and draw in the outside air, which is then introduced into the hollow shaft and hollow blades after heating, and then the hollow shaft drives the hollow blades to stir the water while transferring heat, thereby improving the heating efficiency of the water in the box and increasing the steam output.

[0009] Furthermore, a wind duct is provided on one side of the top of the box body, and a transmission rod is rotatably installed on the wind duct, and the upper end of the transmission rod is connected to two fan blades, and the lower end of the transmission rod and the outer side of the output end of the motor are both provided with two synchronous wheels, and the two synchronous wheels are connected by two synchronous belts. The upper end of the wind duct is connected to an L-shaped tube, and one end of the L-shaped tube corresponds to the upper end of the exhaust port, so as to blow the steam discharged from the exhaust port to accelerate its diffusion.

[0010] Furthermore, the upper outer wall of the hollow shaft is symmetrically provided with support rods, and the upper inner wall of the box is provided with a support ring corresponding to the support rod. One end of the support rod is provided with a slide groove adapted to the support ring. The bottom of the support rod is connected to a scraper, and one end of the scraper is in contact with the inner wall of the box to clean the inner wall of the box and avoid the formation of some ditches on the inner wall of the box after a period of use.

[0011] Furthermore, a sealing layer is provided at the bottom of the sealing plate, the buffer groove is U-shaped, and the inner wall of the opening at one end of the buffer groove is parallel to the guide plate. The diameter of the bevel gear one is larger than the diameter of the bevel gear two, so as to improve the sealing between the sealing plate and the fixed block. The difference in diameter between the bevel gear one and the bevel gear two makes the rotation speed of the bevel gear two greater than the rotation speed of the hollow shaft.

[0012] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0013] 1. The utility model can be linked with the hollow shaft through the heating mechanism, continuously driving the fan blades to rotate and draw air and pass through the partitions. Part of the air flows between the partitions, and the other part passes through the buffer groove and impacts the air between the partitions to slow it down, prolonging the retention time and making it heated to a higher temperature. The heated air is introduced into the hollow shaft and hollow blades, which can stir the water and transfer heat at the same time, thereby improving the heating effect and thus improving the steam output efficiency. In conjunction with the valve mechanism, the exhaust port can be closed when the water is heated. When the water is heated to a certain temperature, the air pressure in the box increases, which will open the exhaust port to discharge the steam, reduce heat loss, improve the heating effect, and be more convenient to use and more practical.

[0014] 2. The utility model can scrape the inner wall of the box through the support rod, support ring and scraper to avoid scale adhering to the inner wall of the box after a period of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 It is a schematic structural diagram of the utility model as a whole;

[0017] Figure 2 This utility model Figure 1 Schematic diagram of the enlarged structure of A in the middle;

[0018] Figure 3 This utility model Figure 1 Schematic diagram of the enlarged structure of B;

[0019] Figure 4 This is a schematic diagram of the structure between the connecting cylinder and the sealing plate of the utility model;

[0020] Figure 5 It is a schematic diagram of the structure between the hollow shaft and the hollow blades of the utility model;

[0021] In the figure: 1. Box body; 2. Exhaust port; 3. Hollow shaft; 4. Hollow blade; 5. Motor; 6. Heating rod 1; 7. Box cover; 8. Docking block; 9. Air duct; 10. Rotating shaft; 11. Synchronous wheel 1; 12. Synchronous belt 1; 13. Rotating rod; 14. Fan blade 1; 15. Bevel gear 1; 16. Bevel gear 2; 17. Partition; 18. Guide plate; 19. Buffer groove; 20. Heating rod 2; 21. Support rod; 22. Support ring; 23. Scraper; 24. Connecting tube; 25. Fixed block; 26. Sealing plate; 27. Bracket; 28. Guide rod; 29. ​​Limiting plate; 30. Spring; 31. Air duct; 32. Transmission rod; 33. Fan blade 2; 34. Synchronous wheel 2; 35. Synchronous belt 2. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] like Figure 1 - Figure 5The concrete maintenance device for construction shown in the figure includes a box body 1, a water inlet pipe is provided on one side of the upper part of the box body 1, a drain pipe is provided on one side of the lower part of the box body 1, and a box cover 7 is detachably connected to the top of the box body 1. In this example, the box cover 7 is connected to the box body 1 through a lock so that the box cover 7 can be opened to clean the box body 1 or maintain and repair the components inside the box 1. A steam exhaust port 2 is provided on one side of the top of the box cover 7, and a valve mechanism is provided in the steam exhaust port 2. A hollow shaft 3 is rotatably installed in the box body 1, and a plurality of hollow blades 4 are provided on the side walls of the hollow shaft 3. The hollow shaft 3 A docking block 8 is embedded in the upper end, a motor 5 is provided on the top of the box cover 7, and the output end of the motor 5 is fixedly connected to the docking block 8, a heating rod 6 is symmetrically provided on the outside of the hollow blade 4 at the bottom of the box body 1, and a heating mechanism connected to the hollow shaft 3 is provided at the bottom of the box body 1, a wind tube 31 is provided on one side of the top of the box cover 7, and a transmission rod 32 is rotatably installed in the wind tube 31, the upper end of the transmission rod 32 is connected to the fan blade 2 33, the lower end of the transmission rod 32 and the outside of the output end of the motor 5 are both sleeved with a synchronous wheel 2 34, and the synchronous wheels 2 34 are connected by a synchronous belt 2 35. In this example, the valve mechanism includes a connecting cylinder 24, which is arranged in the exhaust port 2, and the lower end of the connecting cylinder 24 is threadedly connected to the exhaust port 2, a fixing block 25 is fixedly installed in the connecting cylinder 24, and a through groove is opened on the top of the fixing block 25, a sealing plate 26 is provided on the upper part of the through groove, and a bracket 27 is provided below the fixing block 25, and a guide rod 28 is provided at the bottom of the bracket 27, and the upper end of the guide rod 28 is fixedly connected to the sealing plate 26, and the lower end of the guide rod 28 is connected to a limit plate 29, and a spring 30 is sleeved on the outer side of the guide rod 28 on the limit plate 29 and the outer side of the bracket 27. The setting of the valve mechanism can block the exhaust port 2 when the water is first heated to prevent heat loss. When the water in the box 1 is heated to a certain degree and its internal pressure reaches a certain level, the sealing plate 26 is separated from the fixing block 25, and the exhaust port 2 is opened. When steam is generated, the steam will be discharged into the surrounding space through the exhaust port 2, avoiding heat loss at the beginning of heating, which affects the efficiency of steam generation by heating water, and is more practical.In this example, the heating mechanism includes an air duct 9, and the air duct 9 is fixedly installed at the bottom of the box body 1, one end of the air duct 9 is rotatably connected to the lower end of the hollow shaft 3 through a connector, a rotating shaft 10 is rotatably installed on the top of the air duct 9, the rotating shaft 10 and the outer side of the hollow shaft 3 are both sleeved with a synchronous wheel 11, and the synchronous wheels 11 are connected by a synchronous belt 12, the lower end of the rotating shaft 10 is connected to a bevel gear 15 in the air duct 9, a rotating rod 13 is rotatably installed below the bevel gear 15, the outer side of the rotating rod 13 is sleeved with a bevel gear 2 16 meshing with the bevel gear 15, one end of the rotating rod 13 is connected to a fan blade 14, and three partitions 17 are sequentially provided on the side of the fan blade 14 away from the rotating rod 13 in the air duct 9, and an opening is opened on one side of the partition 17, and several partitions 17 The openings on the upper portion are distributed in a bottom-up-bottom form. Several buffer grooves 19 are provided on the same side of the two partitions 17 on the right side, and a guide plate 18 is provided on one side of the opening below the buffer groove 19. The directions of the buffer grooves 19 on the two partitions 17 on the right side are opposite. Several heating rods 20 are provided between adjacent partitions 17, and the heating rods 20 are located between the upper and lower adjacent guide plates 18. Exhaust holes are symmetrically provided on the upper side wall of the hollow shaft 3. The setting of the heating mechanism can be linked with the hollow shaft 3 to drive the fan blade 14 to rotate and draw in the outside air, which is then introduced into the hollow shaft 3 and the hollow blade 4 after heating, and then the hollow shaft 3 drives the hollow blade 4 to stir the water while transferring heat, thereby improving the heating efficiency of the water in the box body 1 and increasing the steam output.

[0024] In this example, a blower 31 is provided on one side of the top of the housing 1. A transmission rod 32 is rotatably mounted on the blower 31. The upper end of the transmission rod 32 is connected to a second fan blade 33. The lower end of the transmission rod 32 and the outer side of the output end of the motor 5 are both sleeved with a second synchronous wheel 34. The two second synchronous wheels 34 are connected by a second synchronous belt 35. The upper end of the blower 31 is connected to an L-shaped tube, and one end of the L-shaped tube corresponds to the upper end of the exhaust port 2, so as to blow the steam discharged from the exhaust port 2 and accelerate its diffusion. In this example, support rods 21 are symmetrically provided on the outer wall of the upper portion of the hollow shaft 3. A support ring 22 is provided on the upper inner wall of the housing 1 corresponding to the support rod 21. One end of the support rod 21 is provided with a slide groove adapted to the support ring 22. A scraper 23 is connected to the bottom of the support rod 21, and one end of the scraper 23 contacts the inner wall of the housing 1 to clean the inner wall of the housing 1 and prevent the formation of some grooves on the inner wall of the housing 1 after a period of use. In this example, a sealing layer is provided at the bottom of the sealing plate 26, the buffer groove 19 is U-shaped, and the inner wall of the opening at one end of the buffer groove 19 is parallel to the guide plate 18. The diameter of the bevel gear 15 is larger than the diameter of the bevel gear 2 16, so as to improve the sealing between the sealing plate 26 and the fixed block 25. The difference in diameter between the bevel gear 15 and the bevel gear 2 16 makes the rotation speed of the bevel gear 2 16 greater than the rotation speed of the hollow shaft 3.

[0025] The working principle of the present utility model is as follows: when in use, the motor 5 is started to drive the docking block 8 and then drive the hollow shaft 3 to drive the hollow blades 4 to rotate and stir the water, and at the same time the heating rod 1 6 and the heating rod 2 20 are started, the heating rod 1 6 will heat the water, and at the same time the hollow shaft 3 will drive the rotating shaft 10 to rotate through the synchronous wheel 11 and the synchronous belt 12, and the rotating shaft 10 will drive the bevel gear 15, so that the bevel gear 15 drives the bevel gear 2 16 meshing with it to drive the rotating rod 13 to rotate, and then drive the fan blade 14 to rotate, thereby sucking in the outside air and entering the air duct 9 after being filtered, and then entering between the adjacent partitions 17, passing through the heating rod 2 20 for heating, and then discharged into the hollow shaft 3 and the hollow blades 4, and then transferring heat through the hollow blades 4 and the hollow shaft 3 to heat the water, thereby improving the heating effect and efficiency. When the air passes between the adjacent partitions 17 for heating, it will be divided into two parts, one part continues to pass through the guide plate 18 The rotation of the hollow shaft 3 will also drive the support rod 21 and then drive the scraper 23 to rotate, so that it can scrape the inner wall of the box 1 to avoid some scale adhering to the inner wall, which is more practical.

[0026] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A concrete maintenance device for construction, comprising a housing (1), wherein an upper side of the housing (1) is provided with a water inlet pipe, and a lower side of the housing (1) is provided with a drain pipe, characterized in that: The top of the box body (1) is detachably connected to a box cover (7), a steam exhaust port (2) is provided on one side of the top of the box cover (7), a valve mechanism is provided in the steam exhaust port (2), a hollow shaft (3) is rotatably installed in the box body (1), a plurality of hollow blades (4) are provided on the side walls of the hollow shaft (3), a docking block (8) is embedded and installed on the upper end of the hollow shaft (3), a motor (5) is provided on the top of the box cover (7), and the output end of the motor (5) is fixedly connected to the docking block (8), and the bottom of the box body (1) is fixedly connected to the output end of the motor (5). A heating rod (6) is symmetrically provided on the outer side of the hollow blade (4); a heating mechanism connected to the hollow shaft (3) is provided at the bottom of the box body (1); a wind tube (31) is provided on one side of the top of the box cover (7); and a transmission rod (32) is rotatably installed in the wind tube (31); the upper end of the transmission rod (32) is connected to the second fan blade (33); the lower end of the transmission rod (32) and the outer side of the output end of the motor (5) are both sleeved with a second synchronous wheel (34), and the second synchronous wheel (34) is connected by a second synchronous belt (35).

2. A concrete maintenance device for construction according to claim 1, characterized in that: The valve mechanism comprises a connecting cylinder (24), the connecting cylinder (24) being arranged in the exhaust port (2), and the lower end of the connecting cylinder (24) being threadedly connected to the exhaust port (2), a fixing block (25) being fixedly installed in the connecting cylinder (24), and a through groove being provided on the top of the fixing block (25), a sealing plate (26) being provided on the upper part of the through groove, a bracket (27) being provided below the fixing block (25), a guide rod (28) being provided at the bottom of the bracket (27), and the upper end of the guide rod (28) being fixedly connected to the sealing plate (26), the lower end of the guide rod (28) being connected to a limiting plate (29), and a spring (30) being sleeved on the outer side of the guide rod (28) and the outer side of the limiting plate (29) and the bracket (27).

3. The concrete maintenance device for construction according to claim 2, characterized in that: The heating mechanism comprises an air duct (9), and the air duct (9) is fixedly installed at the bottom of the box (1), one end of the air duct (9) is rotatably connected to the lower end of the hollow shaft (3) through a connector, a rotating shaft (10) is rotatably installed on the top of the air duct (9), the rotating shaft (10) and the outer sides of the hollow shaft (3) are both sleeved with a synchronous wheel (11), and the synchronous wheels (11) are connected through a synchronous belt (12), the lower end of the rotating shaft (10) is connected to a bevel gear (15) in the air duct (9), a rotating rod (13) is rotatably installed below the bevel gear (15), the outer side of the rotating rod (13) is sleeved with a bevel gear (16) meshing with the bevel gear (15), and one end of the rotating rod (13) is connected to a Blade 1 (14), three partitions (17) are sequentially provided on the side of blade 1 (14) away from the rotating rod (13) in the air duct (9), and an opening is provided on one side of the partition (17), and the openings on the plurality of partitions (17) are distributed in a bottom-up-bottom form, and a plurality of buffer grooves (19) are provided on the same side of the two right partitions (17), and a guide plate (18) is provided on one side of the opening below the buffer groove (19), and the buffer grooves (19) on the two right partitions (17) are in opposite directions, and a plurality of heating rods (20) are provided between adjacent partitions (17), and the heating rods (20) are located between the upper and lower adjacent guide plates (18), and the upper side wall of the hollow shaft (3) is symmetrically provided with exhaust holes.

4. The concrete maintenance device for construction according to claim 1, characterized in that: A wind tube (31) is provided on one side of the top of the box body (1), and a transmission rod (32) is rotatably mounted on the wind tube (31), and the upper end of the transmission rod (32) is connected to a second fan blade (33). The lower end of the transmission rod (32) and the outer side of the output end of the motor (5) are both sleeved with a second synchronous wheel (34), and the two second synchronous wheels (34) are connected by a second synchronous belt (35). The upper end of the wind tube (31) is connected to an L-shaped pipe, and one end of the L-shaped pipe corresponds to the upper end of the exhaust port (2).

5. The concrete maintenance device for construction according to claim 2, characterized in that: A support rod (21) is symmetrically provided on the outer wall of the upper portion of the hollow shaft (3); a support ring (22) is provided on the upper portion of the inner wall of the box body (1) corresponding to the support rod (21); a sliding groove adapted to the support ring (22) is provided at one end of the support rod (21); a scraper (23) is connected to the bottom of the support rod (21), and one end of the scraper (23) contacts the inner wall of the box body (1).

6. The concrete maintenance device for construction according to claim 3, characterized in that: A sealing layer is provided at the bottom of the sealing plate (26); the buffer groove (19) is U-shaped, and the inner wall of the opening at one end of the buffer groove (19) is parallel to the guide plate (18); the diameter of the bevel gear 1 (15) is greater than the diameter of the bevel gear 2 (16).

Citation Information

Patent Citations

  • Concrete maintenance device for building construction

    CN219732841U