A device for repairing cracks in concrete structures

Abstract

The utility model discloses a kind of concrete building crack repairing devices, it is related to building crack repairing technical field, including mortar spray head and sliding frame, handle is fixedly arranged on the mortar spray head, handle one end is fixedly arranged with limit board, the sliding frame is simultaneously set on horizontal frame and vertical frame, adjusting mechanism is equipped on the mobile car upper end, fixed mechanism is equipped on the sliding frame upper end.The utility model passes through fixed mechanism, it is convenient to quickly install mortar spray head on the sliding frame upper end, so that mortar spray head can carry out handheld repair work and auxiliary repair work, by setting first threaded rod, mortar spray head can be driven to move at uniform speed vertically, while vertical frame can drive mortar spray head to move horizontally, so that mortar spray head can carry out repair work according to crack trajectory, to increase the practicality of concrete building crack repairing device.

Description

Technical Field

[0001] This utility model relates to the field of building crack repair technology, specifically a repair device for cracks in concrete buildings. Background Technology

[0002] Building construction is the crucial process of transforming design blueprints into physical structures, encompassing multiple stages such as foundation engineering, main structure construction, roofing engineering, and decoration engineering. The site of implementation is the construction site. Large-volume concrete structures, due to their high integrity and load-bearing capacity, are widely used in modern construction projects. Typical examples include large equipment foundations, hydraulic dams, tunnel linings, high-rise building basements, and large bridge piers. However, during the construction or service life of such structures, they are highly susceptible to cracking in walls, floor slabs, and roof slabs due to various factors such as temperature stress, shrinkage and creep, foundation settlement, and load effects. Wall cracks, a common and significant problem, not only affect the structural appearance but can also weaken its integrity, durability, and waterproofing performance, becoming potential safety hazards. Therefore, timely and effective detection and repair of these cracks to prevent further expansion and deterioration is a crucial step in ensuring the safe service life and longevity of large-volume concrete structures.

[0003] The authorization announcement number is CN219528516U, which discloses a device for repairing concrete cracks in building exterior walls. This device mainly consists of a storage tank, a mortar pump, a conduit, a mortar nozzle, and a lifting plate driven by a telescopic cylinder. Its working principle is as follows: the height of the lifting plate is adjusted using the telescopic cylinder so that the nozzle is aligned with the crack; the mortar pump is started, pumping concrete slurry from the storage tank to the mortar nozzle through the conduit; after cleaning impurities from the crack surface, the nozzle is operated to inject the slurry into the crack to achieve the filling purpose. This device achieves nozzle height adjustment through cylinder drive, simplifying some operations. However, its core drawback lies in the severely limited freedom of movement; the telescopic cylinder can only provide a single linear lifting motion. Because concrete cracks in actual engineering are complex and varied in shape, often exhibiting meandering curves or oblique distribution, this device cannot allow the nozzle to move laterally or flexibly turn along the crack direction. This lack of mobility means that it can only be used to repair cracks with a near-vertical direction, while it is helpless against the large number of non-linear cracks, which greatly limits its application range and repair effect in actual complex working conditions.

[0004] Based on this, a repair device for cracks in concrete buildings is now provided, which can eliminate the drawbacks of existing devices. Utility Model Content

[0005] The purpose of this invention is to provide a device for repairing cracks in concrete buildings, so as to solve the problems in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A device for repairing cracks in concrete structures includes a mortar nozzle and a sliding frame. The mortar nozzle has an input end connected to a delivery hose, the other end of which is connected to the output end of a mortar pump. The mortar pump input end is connected to the interior of a storage tank. Both the mortar pump and the storage tank are fixedly mounted on a mobile vehicle. A handle is fixedly mounted on the mortar nozzle, with a limiting plate fixedly mounted at one end of the handle. The sliding frame is simultaneously fitted onto a horizontal frame and a vertical frame. A first guide rod and a second guide rod are slidably mounted at one end of the horizontal and vertical frames, respectively. The first guide rod is fixedly mounted inside the fixed frame. The fixed frame is fixedly mounted on the upper end of the mobile vehicle. The upper end of the mobile vehicle is equipped with an adjustment mechanism for moving the mortar nozzle along the length of the horizontal frame. The upper end of the sliding frame is equipped with a fixing mechanism for fixing the mortar nozzle.

[0008] Based on the above technical solutions, this utility model also provides the following optional technical solutions:

[0009] In one alternative: the other end of the crossbeam is provided with a first threaded hole, a first threaded rod is fitted in the first threaded hole, the first threaded rod is rotatably disposed inside the fixed frame, one end of the first threaded rod is fixedly connected to the output end of the first motor, the first motor is fixedly disposed on the upper end of the fixed frame, the first motor is electrically connected to the control console, and the control console is fixedly disposed on the fixed frame.

[0010] In one alternative embodiment: the adjusting mechanism includes a second threaded rod, and the other end of the longitudinal frame is provided with a second threaded hole. The second threaded rod is fitted inside the second threaded hole. The second threaded rod is rotatably disposed inside a limiting tube. The limiting tube is fixed to the upper end of the moving vehicle. A second guide slide rod at one end of the longitudinal frame is fixedly disposed in the mounting groove at the end of the fixed frame. Fixed shafts are fixed at both ends of the second threaded rod. The fixed shafts are rotatably disposed in a rotating hole at one end of the fixed frame. A first bevel gear is fixedly disposed at one end of the fixed shaft. A second bevel gear meshes with the first bevel gear. The second bevel gear is fixedly disposed at one end of the transmission rod. A fixed block is rotatably disposed on the transmission rod. The fixed block is fixed to one side of the fixed frame. An external spline shaft is fixedly disposed at the other end of the transmission rod. An internal spline shaft is fitted on the external spline shaft. The external spline shaft and the internal spline shaft are splined together. A handwheel is fixedly disposed at the other end of the internal spline shaft. A protective cover is provided at the position corresponding to the position of the internal spline shaft at the upper end of the moving vehicle.

[0011] In one alternative: one end of the internal spline shaft is rotatably provided with a snap-fit ​​bracket, the snap-fit ​​bracket is fixedly connected to the fixing bracket by screws, and the fixing bracket is provided with several adjusting screw holes.

[0012] In one alternative embodiment: the fixing mechanism includes a limiting frame and a stop plate. The limiting frame is fixedly mounted on the upper end of the fixing plate, and the fixing plate is fixedly mounted on the upper end of the sliding frame. The limiting plate is inserted into the inner side of the limiting frame. One end of the limiting plate is tightly fitted with the stop plate. The stop plate is slidably mounted in the sliding hole at the upper end of the fixing plate. A fixing frame is fixedly mounted at the bottom end of the stop plate. A fixing post is fixedly mounted in the middle of the bottom end of the stop plate. A fixing disc is fixedly mounted at one end of the fixing post. The fixing disc is slidably mounted inside the fixing tube. The fixing tube is fixedly mounted at the bottom end of the fixing plate. A return spring is provided between the bottom end of the fixing disc and one end of the fixing tube.

[0013] In one alternative: a trowel plate is provided below the mortar nozzle, a fixed barrier is provided at the upper end of the trowel plate, and symmetrical insertion rods are provided at the upper end of the fixed barrier. Insertion blocks are installed on each insertion rod, and the insertion blocks are fixedly installed on the mortar nozzle.

[0014] In one alternative embodiment: the storage tank is equipped with an installation shaft inside, one end of which is rotatably connected to the bottom of the storage tank, and the other end of which extends to the outside of the storage tank. A conveying pipe is provided outside the installation shaft, one end of which is rotatably connected to the installation shaft. A spiral plate is fixedly provided on the installation shaft at a position corresponding to the inside of the conveying pipe. A connecting seat is fixedly provided at the upper end of the conveying pipe, and a sleeve shaft is fixedly provided at the upper end of the connecting seat. Several stirring rods are arranged in an array outside the conveying pipe. A third bevel gear is fixedly provided at one end of the installation shaft, and a fourth bevel gear meshes with the third bevel gear. Both the third and fourth bevel gears mesh with a fifth bevel gear. The fifth bevel gear is fixedly located at the output end of a second motor, and the second motor is fixedly located at the upper end of the storage tank.

[0015] In one alternative: scrapers are symmetrically arranged on the conveying pipe, the scrapers are in close contact with the inner wall of the storage tank, and a drain pipe is connected to the bottom of the storage tank, with a plug inside the drain pipe.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This utility model uses a fixing mechanism to facilitate quick installation of the mortar nozzle on the upper end of the sliding frame, allowing the mortar nozzle to be used for handheld repair work and auxiliary repair work. By setting a first threaded rod, the mortar nozzle can be driven to move longitudinally at a uniform speed. At the same time, the longitudinal frame can drive the mortar nozzle to move laterally, allowing the mortar nozzle to perform repair work according to the crack trajectory, thereby increasing the practicality of the concrete building crack repair device. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2This is a schematic diagram of the installation of the sliding bracket of this utility model.

[0020] Figure 3 This is a schematic diagram of the internal structure of the storage tank of this utility model.

[0021] Figure 4 This is a schematic diagram of the installation of the spiral plate of this utility model.

[0022] Figure 5 This is a schematic diagram of the installation of the second threaded rod of this utility model.

[0023] Figure 6 This is a schematic diagram of the installation of the external spline shaft and the internal spline shaft of this utility model.

[0024] Figure 7 This is a schematic diagram of the installation of the limit frame of this utility model.

[0025] Figure 8 This is a schematic diagram of the stop plate structure of this utility model.

[0026] Figure label annotations: 11 Mortar spraying, 12 Handle, 13 Limiting plate, 14 Mortar pump, 15 Storage tank, 16 Moving cart, 17 Limiting frame, 18 Sliding frame, 19 Horizontal frame, 20 First threaded rod, 21 First motor, 22 Fixed frame, 23 Longitudinal frame, 24 Second threaded rod, 25 Transmission rod, 26 External splined shaft, 27 Internal splined shaft, 28 Snap-fit ​​frame, 29 Stop plate, 30 Return spring, 31 Smearing plate, 32 Mounting shaft, 33 Spiral plate, 34 Conveying pipe, 35 Second motor, 36 Scraper frame, 37 Stopper block, 38 Control console, 39 Battery. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0028] Example 1

[0029] In one embodiment, such as Figures 1-8As shown, a repair device for cracks in concrete structures includes a mortar nozzle 11 and a sliding frame 18. The mortar nozzle 11 has an input end connected to a delivery hose, the other end of which is connected to the output end of a mortar pump 14. The input end of the mortar pump 14 is connected to the interior of a storage tank 15. Both the mortar pump 14 and the storage tank 15 are fixedly mounted on the upper end of a mobile vehicle 16. A handle 12 is fixedly mounted on the mortar nozzle 11, and a limiting plate 13 is fixedly mounted on one end of the handle 12. The sliding frame 18 is simultaneously fitted onto a horizontal frame 19 and a vertical frame 23. A first guide slide rod and a second guide slide rod are slidably provided at one end of the cross frame 19 and the longitudinal frame 23 respectively. The first guide slide rod is fixedly provided inside the fixed frame 22. The fixed frame 22 is fixedly provided on the upper end of the moving vehicle 16. The upper end of the moving vehicle 16 is provided with an adjustment mechanism for driving the mortar nozzle 11 to move along the length direction of the cross frame 19. The upper end of the sliding frame 18 is provided with a fixing mechanism for fixing the mortar nozzle 11. The adjustment mechanism facilitates the adjustment of the lateral working direction of the mortar nozzle 11. The fixing mechanism can quickly fix and disassemble the mortar nozzle 11.

[0030] The other end of the crossbeam 19 is provided with a first threaded hole, and a first threaded rod 20 is fitted in the first threaded hole. The first threaded rod 20 is rotatably mounted inside the fixed frame 22. One end of the first threaded rod 20 is fixedly connected to the output end of the first motor 21. The first motor 21 is fixedly mounted on the upper end of the fixed frame 22. The first motor 21 is electrically connected to the control console 38. The control console 38 is fixedly mounted on the fixed frame 22. In use, when the mortar nozzle 11 needs to be repaired, the mortar pump 14 and the first motor 21 are started by controlling the control console 38. The mortar pump 14 draws concrete from the storage tank 15 and then delivers it to the inside of the mortar nozzle 11 through the delivery hose. Then, the end of the mortar nozzle 11 is aligned with the crack, and the concrete is delivered into the crack for repair. At the same time, the first motor 21 drives the first threaded rod 20 to rotate. Under the action of the thread, the crossbeam 19 drives the mortar nozzle 11 to move along the axis of the first threaded rod 20, thereby completely repairing the crack.

[0031] The adjusting mechanism includes a second threaded rod 24. A second threaded hole is fitted at the other end of the longitudinal frame 23, and the second threaded rod 24 is fitted inside the second threaded hole. The second threaded rod 24 is rotatably disposed inside a limiting tube, which is fixed to the upper end of the moving vehicle 16. A second guide slide rod at one end of the longitudinal frame 23 is fixedly disposed in the mounting groove at the end of the fixed frame 22. Fixed shafts are fixed at both ends of the second threaded rod 24. The fixed shafts are rotatably disposed in a rotating hole at one end of the fixed frame 22. A first bevel gear is fixedly disposed at one end of the fixed shaft, and a second bevel gear meshes with the first bevel gear. The second bevel gear is fixedly disposed at one end of the transmission rod 25. A fixed block is rotatably disposed on the transmission rod 25, and the fixed block is fixedly disposed on one side of the fixed frame 22. An external spline shaft 26 is fixedly disposed at the other end of the transmission rod 25. An inner spline shaft 27 is fitted onto the spline shaft 26. The outer spline shaft 26 and the inner spline shaft 27 are splined together. A handwheel is fixed to the other end of the inner spline shaft 27. A protective cover is provided at the upper end of the moving carriage 16 corresponding to the position of the inner spline shaft 27. When in use, when the mortar nozzle 11 is working, the first threaded rod 20 drives the mortar nozzle 11 to move longitudinally. At the same time, according to the shape of the crack, the user turns a handwheel. The handwheel drives the transmission rod 25 to rotate through the cooperation of the inner spline shaft 27 and the outer spline shaft 26. The second bevel gear meshes with the first bevel gear and drives the second threaded rod 24 to rotate. Under the action of the thread, the longitudinal frame 23 drives the sliding frame 18 to move along the length direction of the transverse frame 19. The sliding frame 18 drives the mortar nozzle 11 to move laterally, thereby causing the mortar nozzle 11 to move along the shape of the crack.

[0032] One end of the internal spline shaft 27 is rotatably provided with a snap-fit ​​bracket 28, which is fixedly connected to the fixing bracket 22 by screws. The fixing bracket 22 is provided with several adjusting screw holes, which facilitates the adjustment of the handwheel height during use.

[0033] The fixing mechanism includes a limiting frame 17 and a stop plate 29. The limiting frame 17 is fixedly mounted on the upper end of the fixing plate, and the fixing plate is fixedly mounted on the upper end of the sliding frame 18. The limiting plate 13 is inserted into the inner side of the limiting frame 17. One end of the limiting plate 13 is tightly attached to the stop plate 29. The stop plate 29 is slidably mounted in the sliding hole at the upper end of the fixing plate. A fixing frame is fixedly mounted at the bottom end of the stop plate 29. A fixing post is fixedly mounted in the middle of the bottom end of the stop plate 29. A fixing plate is fixedly mounted at one end of the fixing post. The fixing plate is slidably mounted inside the fixing tube. The fixing tube is fixedly mounted at the bottom end of the fixing plate. A return spring 30 is provided between the bottom end of the fixing plate and one end of the fixing tube. When the mortar nozzle 11 needs to be installed on the upper end of the sliding frame 18, the limiting plate 13 slides on the upper end of the fixed plate. When one end of the limiting plate 13 slides into the inside of the limiting frame 17, the limiting plate 13 pushes the stop plate 29 to slide. After the limiting plate 13 slides completely into the inside of the limiting frame 17, the stop plate 29 returns to its initial position under the action of the return spring 30, thereby fixing the limiting plate 13 and thus fixing the mortar nozzle 11. When it is necessary to hold the mortar nozzle 11 for repair, pull the stop plate 29 to slide, and the user holds the handle 12 to move the limiting plate 13 out of the inside of the limiting frame 17, so that the mortar nozzle 11 can be held for repair work.

[0034] Below the mortar spray nozzle 11 is a troweling plate 31. The upper end of the troweling plate 31 is equipped with a fixed barrier. The upper end of the fixed barrier is symmetrically equipped with insert rods. Each insert rod is equipped with a plug-in block. The plug-in blocks are all fixedly installed on the mortar spray nozzle 11. When in use, when the mortar spray nozzle 11 is working, one end of the troweling plate 31 is in close contact with the wall surface, thereby smoothing the repair area and collecting excess concrete on the upper end of the troweling plate 31.

[0035] Example 2

[0036] The difference from Embodiment 1 is that: the storage tank 15 is provided with an installation shaft 32 inside, one end of which is rotatably connected to the bottom of the storage tank 15, and the other end of which extends to the outside of the storage tank 15. A conveying pipe 34 is provided outside the installation shaft 32, one end of which is rotatably connected to the installation shaft 32. A spiral plate 33 is fixedly provided on the installation shaft 32 at a position corresponding to the inside of the conveying pipe 34. A connecting seat is fixedly provided at the upper end of the conveying pipe 34, and a sleeve shaft is fixedly provided at the upper end of the connecting seat. Several stirring rods are arranged in an array outside the conveying pipe 34. A third bevel gear is fixedly provided at one end of the installation shaft 32, and a fourth bevel gear meshes with the third bevel gear. Both the third and fourth bevel gears are connected to... The fifth bevel gear is engaged and fixedly mounted on the output end of the second motor 35, which is fixedly mounted on the upper end of the storage tank 15. During use, when repairs are being carried out, the output end of the second motor 35 drives the fifth bevel gear to rotate. The fifth bevel gear meshes with the third and fourth bevel gears, respectively driving the mounting shaft 32 and the sleeve shaft to rotate. The sleeve shaft drives the conveying pipe 34 to rotate. The conveying pipe 34 stirs the concrete inside the storage tank 15 through the stirring rod. At the same time, the mounting shaft 32 drives the spiral plate 33 to rotate. The spiral plate 33 cooperates with the conveying pipe 34 to convey the concrete inside the storage tank 15, thereby preventing the concrete from separating. The battery 39 provides power to the mortar pump 14, the first motor 21, and the control console 38.

[0037] The conveying pipe 34 is symmetrically equipped with scrapers 36, which are in close contact with the inner wall of the storage tank 15. The bottom of the storage tank 15 is connected to a drain pipe, and the drain pipe is equipped with a plug 37. When it is needed to clean the inside of the storage tank 15, the conveying pipe 34 drives the scrapers 36 to rotate, and the scrapers 36 scrape off the concrete residue on the inner wall of the storage tank 15, which is then discharged through the drain pipe.

[0038] The above embodiment discloses a repair device for cracks in concrete structures. When the mortar nozzle 11 needs repair, the limiting plate 13 slides on the upper end of the fixing plate. When one end of the limiting plate 13 slides into the limiting frame 17, it pushes the stop plate 29 to slide. After the limiting plate 13 has completely slid into the limiting frame 17, the stop plate 29 returns to its initial position under the action of the return spring 30, thereby fixing the limiting plate 13 and thus fixing the mortar nozzle 11. The mortar pump 14 and the first motor 21 are started by the control console 38. The mortar pump 14 draws concrete from the storage tank 15 and then delivers it to the mortar nozzle 11 through the delivery hose. The end of the mortar nozzle 11 is then... Aligning with the crack, concrete is delivered into the crack for repair. Simultaneously, the first motor 21 drives the first threaded rod 20 to rotate. Under the action of the thread, the cross frame 19 moves the mortar nozzle 11 along the axis of the first threaded rod 20. At the same time, according to the shape of the crack, the user turns a handwheel. The handwheel drives the transmission rod 25 to rotate through the inner spline shaft 27 and the outer spline shaft 26. The second bevel gear meshes with the first bevel gear and drives the second threaded rod 24 to rotate. Under the action of the thread, the longitudinal frame 23 drives the sliding frame 18 to move along the length of the cross frame 19. The sliding frame 18 drives the mortar nozzle 11 to move laterally, thereby moving the mortar nozzle 11 along the shape of the crack and thus completely repairing the crack.

[0039] When it is necessary to use the handheld mortar nozzle 11 for repairs, pull the stop plate 29 to slide, and the user holds the handle 12 to move the limiting plate 13 out of the limiting frame 17, so that the handheld mortar nozzle 11 can be used for repair work.

[0040] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A device for repairing cracks in concrete structures, comprising a mortar nozzle (11) and a sliding frame (18), wherein the input end of the mortar nozzle (11) is connected to a delivery hose, the other end of the delivery hose is connected to the output end of a mortar pump (14), the input end of the mortar pump (14) is connected to the interior of a storage tank (15), and both the mortar pump (14) and the storage tank (15) are fixedly mounted on the upper end of a mobile vehicle (16), characterized in that, A handle (12) is fixedly provided on the mortar nozzle (11). A limiting plate (13) is fixedly provided at one end of the handle (12). The sliding frame (18) is simultaneously sleeved on the horizontal frame (19) and the vertical frame (23). A first guide slide rod and a second guide slide rod are slidably provided at one end of the horizontal frame (19) and the vertical frame (23), respectively. The first guide slide rod is fixedly provided inside the fixed frame (22). The fixed frame (22) is fixedly provided on the upper end of the moving vehicle (16). The upper end of the moving vehicle (16) is provided with an adjustment mechanism for moving the mortar nozzle (11) along the length direction of the horizontal frame (19). The upper end of the sliding frame (18) is provided with a fixing mechanism for fixing the mortar nozzle (11).

2. The device for repairing cracks in concrete buildings according to claim 1, characterized in that, The other end of the cross frame (19) is provided with a first threaded hole, and a first threaded rod (20) is fitted in the first threaded hole. The first threaded rod (20) is rotatably mounted inside the fixed frame (22). One end of the first threaded rod (20) is fixedly connected to the output end of the first motor (21). The first motor (21) is fixedly mounted on the upper end of the fixed frame (22). The first motor (21) is electrically connected to the control console (38). The control console (38) is fixedly mounted on the fixed frame (22).

3. The device for repairing cracks in concrete buildings according to claim 2, characterized in that, The adjusting mechanism includes a second threaded rod (24). A second threaded hole is provided at the other end of the longitudinal frame (23), and the second threaded rod (24) is fitted inside the second threaded hole. The second threaded rod (24) is rotatably disposed inside a limiting tube, which is fixed to the upper end of the moving vehicle (16). A second guide slide rod at one end of the longitudinal frame (23) is fixedly disposed in the mounting groove at the end of the fixed frame (22). Fixed shafts are fixed at both ends of the second threaded rod (24). The fixed shafts are rotatably disposed in a rotating hole at one end of the fixed frame (22). A first bevel gear is fixed at one end of the fixed shaft. A second bevel gear meshes with the bevel gear and is fixedly mounted on one end of the transmission rod (25). A fixing block is rotatably mounted on the transmission rod (25) and is fixedly mounted on one side of the fixing frame (22). An external spline shaft (26) is fixedly mounted on the other end of the transmission rod (25). An internal spline shaft (27) is fitted on the external spline shaft (26). The external spline shaft (26) and the internal spline shaft (27) are splined together. A handwheel is fixedly mounted on the other end of the internal spline shaft (27). A protective cover is provided at the position corresponding to the position of the internal spline shaft (27) on the upper end of the moving car (16).

4. The device for repairing cracks in concrete buildings according to claim 3, characterized in that, One end of the internal spline shaft (27) is provided with a snap-fit ​​bracket (28), which is fixedly connected to the fixing bracket (22) by screws. The fixing bracket (22) is provided with several adjusting screw holes.

5. A device for repairing cracks in concrete buildings according to claim 1, characterized in that, The fixing mechanism includes a limiting frame (17) and a stop plate (29). The limiting frame (17) is fixedly mounted on the upper end of the fixing plate. The fixing plate is fixedly mounted on the upper end of the sliding frame (18). The limiting plate (13) is inserted into the inner side of the limiting frame (17). One end of the limiting plate (13) is tightly attached to the stop plate (29). The stop plate (29) is slidably mounted in the sliding hole at the upper end of the fixing plate. The bottom end of the stop plate (29) is fixedly mounted with a fixing frame. The middle part of the bottom end of the stop plate (29) is fixedly mounted with a fixing column. One end of the fixing column is fixedly mounted with a fixing disc. The fixing disc is slidably mounted inside the fixing tube. The fixing tube is fixedly mounted at the bottom end of the fixing plate. A return spring (30) is provided between the bottom end of the fixing disc and one end of the fixing tube.

6. A device for repairing cracks in concrete buildings according to claim 1, characterized in that, A trowel plate (31) is provided below the mortar nozzle (11). A fixed barrier is provided at the upper end of the trowel plate (31). A symmetrical insert rod is provided at the upper end of the fixed barrier. A plug-in block is installed on each of the insert rods. The plug-in blocks are all fixed on the mortar nozzle (11).

7. A device for repairing cracks in concrete buildings according to claim 1, characterized in that, The storage tank (15) is provided with an installation shaft (32) inside. One end of the installation shaft (32) is rotatably connected to the bottom of the storage tank (15), and the other end of the installation shaft (32) extends to the outside of the storage tank (15). A conveying pipe (34) is provided on the outside of the installation shaft (32). One end of the conveying pipe (34) is rotatably connected to the installation shaft (32). A spiral plate (33) is fixed on the installation shaft (32) at a position corresponding to the inside of the conveying pipe (34). A connecting seat is fixed on the upper end of the conveying pipe (34). A sleeve shaft is fixed on the upper end of the connecting seat. Several stirring rods are arranged in an array on the outside of the conveying pipe (34). A third bevel gear is fixed on one end of the installation shaft (32). A fourth bevel gear is meshed on the third bevel gear. Both the third bevel gear and the fourth bevel gear mesh with a fifth bevel gear. The fifth bevel gear is fixed on the output end of the second motor (35). The second motor (35) is fixed on the upper end of the storage tank (15).

8. A device for repairing cracks in concrete buildings according to claim 7, characterized in that, The conveying pipe (34) is symmetrically provided with scraper (36), the scraper (36) is in close contact with the inner wall of the storage tank (15), the bottom end of the storage tank (15) is connected to a drain pipe, and the drain pipe is provided with a plug (37) inside.

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