A pressurized grouting device for concrete crack repair

Abstract

The application discloses a pressurized grouting device for concrete crack repair, which adopts a rotating suction grouting mode, drives a sleeve through driving and driven pulleys, and makes a suction rod provided with a suction head do circumferential movement to suck slurry in a slurry barrel, the circumferentially moving suction head does not stay at one place, and the slurry at the end of the suction head is continuously sucked into the suction rod, thereby reducing the problem that air mixed with slurry enters the suction head due to staying, and air sections exist in the filled slurry cracks. The pressurized grouting device of the application fixes a scraper through a rotating support, the scraper and the suction rod jointly do circumferential movement under the action of the driving and driven pulleys, the scraper is arranged at the rear side of the circumferentially rotating suction head, and is arranged on one side to stir the slurry in the slurry barrel and on the other side to make the slurry gather and be scraped to the suction port end position of the suction head, thereby further reducing the air entering the suction head.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of concrete repair, and particularly relates to a pressurized grouting device for concrete crack repair. BACKGROUND

[0002] The concrete crack is a physical structure change of the concrete structure due to internal and external factors, and common repair methods for the concrete crack include filling method, grouting method, structure reinforcement method, concrete replacement method and electrochemical protection method. Among them, the grouting method is to pressurize and inject the prepared slurry into the crack to complete the repair. The existing pressurized grouting device is often used to continuously suck the slurry out through the suction head under the action of the grouting pump and inject the slurry into the crack through the nozzle. When the two-component polyether polymer chemical slurry or the slurry is not uniformly stirred, the slurry or the local slurry has a high viscosity, and part of the air is mixed when the high polymer chemical slurry is prepared. In the process of sucking the slurry by the suction head, the slurry cannot be filled in the suction port in time, and thus part of the air is also injected into the crack with the slurry, so that the air segment exists in the crack, thereby affecting the repair quality. SUMMARY

[0003] To solve the problems in the prior art, the present application provides a pressurized grouting device for concrete crack repair.

[0004] The technical scheme of the present application is as follows:

[0005] A pressurized grouting device for concrete crack repair, comprising a trolley, a fixed support, a movable support, a slurry barrel, a sleeve, a scraper, a grouting pump, a first pipe, a second pipe, a third pipe, a driving pulley, a driven pulley, a transmission belt connecting the driving pulley and the driven pulley, a spray rod provided with a nozzle, a suction rod provided with a suction head, a rotating support for fixing the suction rod and the scraper, and a connecting seat and a shaft pipe provided with a cavity in the center, the fixed support and the grouting pump are fixedly connected to the trolley, the movable support is detachably connected to the upper end of the fixed support, the driving pulley and the shaft pipe are respectively fixedly and rotatably arranged on the movable support, the driven pulley is fixedly connected to the sleeve, the sleeve is rotatably sleeved outside the shaft pipe and rotatably supported on the fixed support, the connecting seat is concentrically connected to the inside of the sleeve and the upper end is sealingly rotatably arranged in the cavity at the lower end of the shaft pipe, the rotating support is fixedly connected to the outside of the sleeve and the lower end of the scraper is attached to the bottom surface of the slurry barrel and the suction head is slightly higher than the bottom surface of the slurry barrel and faces the scraper, the first pipe is connected to the suction rod and the lower end of the connecting seat at both ends, the second pipe is connected to the upper end of the shaft pipe and the grouting inlet of the grouting pump at both ends, the third pipe is connected to the grouting outlet of the grouting pump and the spray rod at both ends, and the slurry in the slurry barrel is sprayed out through the spray rod, the first pipe, the connecting seat, the shaft pipe, the second pipe, the grouting pump, the third pipe and the spray rod.

[0006] Further, the driven pulley fixing sleeve is arranged in the inner cavity of the upper end of the sleeve, and is rotatably arranged outside the shaft tube through the first rolling bearing.

[0007] Further, the pressurized grouting device further comprises a first bearing seat assembly, which comprises a first plane bearing, a first plane bearing seat fixedly connected to the fixed support, a first sealing ring in sealing connection with the outer circumferential side of the sleeve, and a first plane bearing cover provided with the first sealing ring, the upper end of the first bearing seat is provided with a first plane bearing mounting cavity for placing the first plane bearing, the loose ring of the first plane bearing is tightly fitted and axially positioned in the first plane bearing mounting cavity, the first bearing cover covers the opening at the upper end of the first plane bearing mounting cavity, the lower end of the first plane bearing seat is provided with a through hole slightly larger than the outer diameter of the sleeve, a sealing groove is arranged on the wall of the through hole, the first sealing ring is arranged in the sealing groove, the sleeve is sealingly connected to the tight ring of the first plane bearing, is loosely sleeved on the loose ring of the first plane bearing, and extends downward from the lower end of the first bearing seat through the through hole, so that the sleeve is rotatably supported on the fixed support.

[0008] Further, the pressurized grouting device further comprises a second bearing seat assembly, which comprises a second plane bearing, a second rolling bearing, a second rolling bearing seat, a second plane bearing seat, a second sealing ring in sealing connection with the outer circumferential side of the shaft tube, a third sealing ring in sealing connection with the outer circumferential side of the connecting seat, a second plane bearing cover, and a second rolling bearing cover, the lower end of the second plane bearing seat is provided with a shaft shoulder, and the upper end is a shaft neck smaller than the shaft shoulder, the shaft neck end is provided with a second plane bearing mounting cavity for placing the second plane bearing, and the loose ring of the second plane bearing is tightly fitted and axially positioned in the second plane bearing mounting cavity; the upper end of the second rolling bearing seat is provided with a second rolling bearing mounting cavity for placing the second rolling bearing, and the lower end is provided with an insertion cavity adapted to the shaft neck of the second plane bearing seat, the outer ring of the second rolling bearing is tightly fitted and axially positioned in the second rolling bearing mounting cavity, the shaft neck of the second plane bearing seat is inserted in the insertion cavity, the shaft shoulder is positioned and connected to the lower end of the second rolling bearing seat, the second plane bearing cover and the second rolling bearing cover are respectively covered on the openings of the second plane bearing mounting cavity and the second rolling bearing mounting cavity, and the second bearing seat assembly is concentrically connected in the inner cavity of the lower end of the sleeve through the second rolling bearing seat; the shaft tube is sealingly connected to the tight ring of the second rolling bearing cover, the connecting seat is sealingly connected to the second plane bearing cover, is loosely sleeved on the loose ring of the second plane bearing, is tightly fitted on the tight ring of the second plane bearing, and the upper end is rotatably and sealingly connected to the inner cavity of the shaft tube.

[0009] Further, the fixed support comprises two vertical rods, a first mounting frame horizontally connected to the upper ends of the two vertical rods and used for connecting the movable support, a second mounting frame horizontally connected to the two vertical rods below the first mounting frame, and at least one set of slurry cylinder positioning assembly; each set of slurry cylinder positioning assembly comprises two right-angled triangular pads, a center positioning screw and a side positioning screw each provided with a positioning head at one end, and a connecting rod and a side rod each provided with a connecting hole, different positions on one right-angled side surface of the two right-angled triangular pads are respectively provided with a through hole with an axis perpendicular to the right-angled side surface, the connecting rod is connected between the two vertical rods below the second mounting frame, the side rods are connected to the outer sides of the two vertical rods at the same height position as the connecting rod, the center positioning screw is screwed to the connecting rod through the connecting hole and a nut, the two right-angled triangular pads are arranged on the side rods opposite to the connecting holes on the side rods, the side positioning screw is connected to the side rod by penetrating the through holes on the two right-angled triangular pads and the connecting holes on the side rod, so that the side positioning screw is in the radial direction of the slurry barrel, and the positioning heads of the side positioning screws on the side rods and the center positioning screw on the connecting rod are positioned at the peripheral side of the slurry barrel that is concentric with the shaft tube.

[0010] Further, the driving pulley and the shaft tube are respectively fixed and rotationally connected to the movable support through a shaft assembly and a shaft seat, the shaft assembly comprises a rotating shaft, a third rolling bearing, and a third rolling bearing seat connected to the movable support, the rotating shaft is rotationally connected to the third rolling bearing seat through the third rolling bearing, and the upper end and the lower end of the rotating shaft are respectively above and below the movable support, and the driving pulley is connected to the rotating shaft below the movable support; the shaft seat is provided with a mounting hole matched with the outer diameter of the shaft tube, and a limiting screw hole is arranged on the wall of the mounting hole in the radial direction, the upper end of the shaft tube is provided with an external thread, the upper end of the shaft tube is inserted into the mounting hole of the shaft seat, and the external thread at the upper end of the shaft tube is located at the upper end of the mounting hole of the shaft seat, so that the shaft tube is axially positioned by a threaded nut, and the shaft tube is circumferentially positioned in the shaft seat by at least one limiting hole slot arranged in the circumferential direction of the shaft tube and matched with the height position of the limiting screw hole in the shaft seat, and a limiting screw is screwed into the limiting screw hole at the end of the limiting hole slot, so that the shaft tube is circumferentially positioned in the shaft seat.

[0011] Further, the scraper is arranged at the rear side of the suction head in the circumferential rotation direction of the suction head, so that the mud is scraped to the suction port position of the suction head.

[0012] Further, the suction port direction of the suction head is vertically downward or opposite to the rotation direction of the scraper and the suction head.

[0013] Further, the first pipe element comprises a plurality of first connecting pipes and a plurality of first connecting pipe heads used for connecting the suction rod and the connecting seat.

[0014] Further, the bottom of the slurry barrel adopts a conical surface that continuously decreases from the center to the periphery, and the suction head and the scraper are arranged at the bottom of the slurry barrel close to the barrel wall.

[0015] Compared with the prior art, the present application has the following beneficial effects:

[0016] The present application provides a pressurized grouting device for concrete crack repair, which adopts a rotary suction method. A sleeve is driven to rotate by a driving pulley and a driven pulley, so that a suction rod provided with a suction head moves in a circumferential direction to suck slurry in a slurry barrel. The suction head moves in a circumferential direction without stopping at a certain position, and the slurry at the end of the suction head is continuously sucked into the suction rod, thereby reducing the problem that air mixed with slurry enters the suction head to cause an air segment in the filled slurry.

[0017] The pressurized grouting device of the present application fixes a scraper by a rotating support, and the scraper moves in a circumferential direction together with the suction rod under the action of the driving pulley and the driven pulley. The scraper is arranged at the rear side of the circumferential rotation of the suction head. The scraper can stir the slurry in the slurry barrel and make the slurry gather at the suction port end of the suction head, thereby further reducing the air entering the suction head.

[0018] The bottom of the slurry barrel is a conical surface that continuously decreases from the center to the periphery. The suction head and the scraper are arranged at the bottom of the barrel near the barrel wall. This design makes the slurry in the slurry barrel gather towards the suction head at the barrel wall.

[0019] The first rolling bearing, the first bearing seat assembly and the second bearing seat assembly are used to rotatably arrange the sleeve outside the shaft tube and rotatably support the sleeve on the fixed support. The connecting seat is concentrically connected to the inside of the sleeve and the upper end is sealed in the cavity rotatably arranged at the lower end of the shaft tube. The structure is simple and ingenious, and facilitates the disassembly and assembly of the pressurized grouting device. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 FIG. 1 is a structural schematic view of the pressurized grouting device;

[0021] Figure 2 FIG. 2 is a structural top view of the pressurized grouting device;

[0022] Figure 3 FIG. 3 is a structural schematic view of the second bearing seat assembly;

[0023] Figure 4 FIG. 4 is a structural schematic view of the fixed support;

[0024] Figure 5 FIG. 5 is a structural schematic view of the movable support;

[0025] Figure 6 FIG. 6 is an assembly schematic view of the support;

[0026] Figure 7 FIG. 7 is a B-B view of Figure 6

[0027] Figure 8 is​Figure 7 A-A view of the device;

[0028] Figure 9 A rotating schematic view of the spray head and the scraper;

[0029] Figure 10 A rotating schematic view of the spray head and the scraper;

[0030] In the figure, 1 - trolley; 2 - fixed support; 3 - movable support; 4 - slurry tank; 5 - sleeve 5; 6 - scraper; 7 - grouting pump; 8 - first pipe; 81 - first connecting pipe; 82 - first connecting pipe head; 9 - second pipe; 10 - third pipe; 11 - driving pulley; 12 - driven pulley; 13 - transmission belt; 14 - spray rod; 141 - spray head; 15 - suction rod; 151 - suction head; 16 - rotating support; 17 - connecting seat; 18 - shaft pipe; 19 - first rolling bearing; 20 - first plane bearing; 21 - first plane bearing seat; 22 - first plane bearing cover; 23 - second plane bearing; 24 - second rolling bearing; 25 - second rolling bearing seat; 26 - second plane bearing seat; 27 - second plane bearing cover; 28 - second rolling bearing cover; 29 - vertical rod; 30 - first installation frame; 31 - second installation frame; 32 - slurry cylinder positioning assembly; 33 - right-angle triangular pad; 34 - center positioning screw; 35 - side positioning screw; 36 - connecting rod; 37 - side rod; 38 - shaft seat; 381 - nut; 39 - shaft assembly; 391 - rotating shaft; 392 - third rolling bearing seat; 393 - third rolling bearing; 394 - third rolling bearing cover; 395 - third rolling bearing installation plate. DETAILED DESCRIPTION

[0031] The present application will be further clarified by the following examples, which should be considered as merely illustrative of the present application and not limiting thereof. Modifications of the present application, in various forms, will occur to those skilled in the art upon reading the foregoing description. Such modifications are intended to fall within the scope of the appended claims.

[0032] Example 1

[0033] A pressurized grouting device for repairing concrete cracks, as shown in Figure 1 and Figure 2 , comprises a trolley 1 as a carrier, a fixed support 2, a movable support 3, a slurry tank 4, a sleeve 5, a scraper 6, a grouting pump 7, a first pipe 8, a second pipe 9, a third pipe 10, a driving pulley 11, a driven pulley 12, a transmission belt 13 connecting the driving pulley 11 and the driven pulley 12, a spray rod 14 provided with a spray head 141, a suction rod 15 provided with a suction head 151, a rotating support 16 for fixing the suction rod 15 and the scraper 6, and a connecting seat 17 and a shaft pipe 18 provided with a cavity at the center.

[0034] The fixed support 2 and the grouting pump 7 are fixedly connected to the trolley 1, the movable support 3 is detachably connected to the upper end of the fixed support 2, the driving pulley 11 and the shaft tube 18 are fixedly and rotatably arranged on the movable support 3 respectively, the driven pulley 12 is fixedly connected to the sleeve 5, the sleeve 5 is rotatably sleeved outside the shaft tube 18 and rotatably supported on the fixed support 2, the connecting seat 17 is concentrically connected to the inner side of the sleeve 5 and the upper end thereof is sealingly rotatably arranged in the cavity at the lower end of the shaft tube 18, the rotating support 16 is fixedly connected to the outer side of the sleeve 5 and the lower end of the scraper 6 is abutted to the bottom surface of the slurry barrel 4 and the suction head 151 is slightly higher than the bottom surface of the barrel and faces the scraper 6. As shown in Figure 9 and Figure 10 The rotating support 16 can be connected to the sleeve 5 through the connecting arc plate with screw holes welded to the outer wall of the sleeve 5.

[0035] The first pipe 8 is connected to the suction rod 15 and the lower end of the connecting seat 17 respectively, the second pipe 9 is connected to the upper end of the shaft tube 18 and the grouting inlet of the grouting pump 7 respectively, and the third pipe 10 is connected to the grouting outlet of the grouting pump 7 and the spray rod 14 respectively; the slurry in the slurry barrel 4 is sprayed out through the spray rod 14, the first pipe 8, the connecting seat 17, the shaft tube 18, the second pipe 9, the grouting pump 7, the third pipe 10 and the spray rod 14. The motor (not shown in the figure) is installed on the movable support 3 and the output shaft of the motor is connected to the driving pulley, or it can be installed outside and connected to the driving pulley through a transmission rod lamp transmission mechanism.

[0036] Further, as shown in Figure 1 The driven pulley 12 is fixedly sleeved in the inner cavity of the upper end of the sleeve 5 and rotatably sleeved outside the shaft tube 18 through the first rolling bearing 19. The first rolling bearing 19 is also provided with the first rolling bearing seat 191 covering the opening of the cavity between the driven pulley and the shaft tube 18.

[0037] Further, as shown in Figure 1As shown, the pressurized grouting device in this example further comprises a first bearing seat assembly, which comprises a first plane bearing 20, a first plane bearing seat 21 fixedly connected to the fixed support, a first sealing ring in sealing connection with the outer circumferential side of the sleeve 5, and a first plane bearing cover 22 provided with the first sealing ring. The upper end of the first plane bearing seat 21 is provided with a first plane bearing mounting cavity for placing the first plane bearing 20. The loose ring of the first plane bearing 20 is tightly fitted and axially positioned in the first plane bearing mounting cavity. The first plane bearing cover 22 covers the opening at the upper end of the first plane bearing mounting cavity. The lower end of the first plane bearing seat 21 is provided with a through hole slightly larger than the outer diameter of the sleeve 5, and a sealing groove is provided on the wall of the through hole. The first sealing ring is arranged in the sealing groove. The sleeve 5 is sealingly passed through the first plane bearing cover 27, tightly fitted with the tight ring of the first plane bearing 20, and loosely sleeved on the loose ring of the first plane bearing 20 and extends downward through the through hole of the first plane bearing seat 21 to support the sleeve 5 on the fixed support 2 in a rotatable manner.

[0038] Further, as shown in Figure 1 and Figure 3 the pressurized grouting device in this example further comprises a second bearing seat assembly, which comprises a second plane bearing 23, a second rolling bearing 24, a second rolling bearing seat 25, a second plane bearing seat 26, a second sealing ring in sealing connection with the outer circumferential side of the shaft tube 18, a third sealing ring in sealing connection with the outer circumferential side of the connecting seat 17, a second plane bearing cover 27, and a second rolling bearing cover 28. The lower end of the second plane bearing seat 26 is provided with a shaft shoulder, and the upper end is a shaft neck smaller than the shaft shoulder. The shaft neck end is provided with a second plane bearing mounting cavity for placing the second plane bearing 23. The loose ring of the second plane bearing 23 is tightly fitted and axially positioned in the second plane bearing mounting cavity. The upper end of the second rolling bearing seat 25 is provided with a second rolling bearing mounting cavity for placing the second rolling bearing 24. The lower end is provided with a plug-in cavity adapted to the shaft neck of the second plane bearing seat 26. The outer ring of the second rolling bearing 24 is tightly fitted and axially positioned in the second rolling bearing mounting cavity. The shaft neck of the second plane bearing seat 26 is plugged into the plug-in cavity. The shaft shoulder is positioned and connected to the lower end of the second rolling bearing seat 25. As shown in Figure 3 a sealing ring is also arranged between the mating surfaces of the second plane bearing seat 26 and the second rolling bearing seat 25. The second plane bearing cover 27 and the second rolling bearing cover 28 cover the openings of the second plane bearing mounting cavity and the second rolling bearing mounting cavity, respectively. The second bearing seat assembly is concentrically connected in the inner cavity at the lower end of the sleeve 5 through the second rolling bearing seat 25. The shaft tube 18 is sealingly passed through the second rolling bearing cover 28, tightly fitted with the inner ring of the second rolling bearing 24. The connecting seat 17 is sealingly passed through the second plane bearing cover 27, loosely sleeved on the loose ring of the second plane bearing 23, tightly fitted on the tight ring of the second plane bearing 23, and the upper end is rotatably sealingly connected with the inner cavity of the shaft tube 18.

[0039] Example 2:

[0040] This embodiment is further designed based on Embodiment 1, as follows: Figures 4-8 As shown, in this example, the fixed bracket 2 includes two vertical rods 29, a first mounting frame 30 horizontally connected to the upper ends of the two vertical rods and used to connect the movable bracket, a second mounting frame 31 horizontally connected to the two vertical rods 29 and located below the first mounting frame 30, and at least one set of impeller positioning assemblies 32; the vertical rods, the first mounting frame, and the second mounting frame can be formed by welding channel steel. Figure 1 As shown, the pressurized grouting device is equipped with two sets of grout cylinder positioning assemblies. Each set of grout cylinder positioning assemblies 32 includes two right-angled triangular pads 33, a central positioning screw 34 and a side positioning screw 35 respectively equipped with positioning heads at one end, and a connecting rod 36 and a side rod 37 respectively equipped with connecting holes. The two right-angled triangular pads 33 have through holes at different positions on one right-angled side surfaces, with the axis perpendicular to the right-angled side surface. A connecting rod 36 is connected between two vertical rods 29 below the second mounting frame 31, and the two side rods 37 are connected to the outside of the two vertical rods 29 at the same height as the connecting rod 36. The center positioning screw 34 is screwed onto the connecting rod 36 through the connecting hole and nut. The two right-angled triangular pads 33 are arranged on both sides of the connecting hole on the side rod 37 with their hypotenuses facing each other. The side positioning screw 35 passes through the through holes on the two right-angled triangular pads and the connecting hole on the side rod 37 and is connected to the side rod 37, so that the side positioning screw 35 is in the radial direction of the slurry tank 4, and the positioning heads of the side positioning screws on both sides of the rod 37 and the center positioning screw on the connecting rod are in the positioning position on the outer periphery of the slurry tank 4, which is concentric with the shaft tube 18.

[0041] Example 3:

[0042] This embodiment is further designed based on embodiment two, as follows: Figure 1 As shown, in this example, the drive pulley 11 and the shaft tube 18 are respectively fixedly and rotatably connected to the movable bracket 3 via the shaft assembly 39 and the shaft seat 38. The shaft assembly 39 includes a rotating shaft 391, a third rolling bearing 393, a third rolling bearing seat 392 connected to the movable bracket 3, a third rolling bearing cover 394, and a third rolling bearing mounting plate 395. The rotating shaft 391 is rotatably connected to the third rolling bearing seat 392 via the third rolling bearing 393, and the upper and lower ends of the rotating shaft 391 are located above and below the movable bracket 3, respectively. The drive pulley 11 is connected to the rotating shaft 391 located below the movable bracket 3. The third rolling bearing cover 394 covers the cavity opening between the third rolling bearing seat 392 and the rotating shaft 391. The third rolling bearing seat is fixedly connected to the movable bracket 3 via the third rolling bearing mounting plate 395.

[0043] The upper end of the shaft tube 18 is provided with external threads, the upper end of the shaft tube 18 is inserted into the mounting hole of the shaft seat 38 and the external threads at the upper end are located at the upper end of the mounting hole of the shaft seat 38, a nut is screwed to axially position the shaft tube 18; the shaft tube is provided with at least one radial limiting hole slot in the circumferential direction and at a height position adapted to the limiting screw hole of the shaft seat, a limiting screw is screwed into the limiting screw hole and located at least in the limiting hole slot, so that the shaft tube 18 is circumferentially positioned in the shaft seat 38.

[0044] Further, as shown in Figure 9 and Figure 10 , in this example, the scraper 6 is arranged at the rear side of the circumferential rotation of the suction head 151, so that the mud is scraped to the suction port position of the suction head 151.

[0045] Further, in this example, the suction port direction of the suction head 151 is vertically downward, as shown in Figure 9 ; the suction port direction of the suction head 151 can also be opposite to the rotation direction of the scraper 6 and the suction head, as shown in Figure 10 .

[0046] Further, as shown in Figure 1 , Figure 3 , Figure 9 and Figure 10 , in this example, the first pipe 8 includes a plurality of first connecting pipes 81 and a plurality of first connecting pipe heads 82 for connecting the suction rod 15 and the connecting seat 17.

[0047] Embodiment Four:

[0048] This embodiment is further designed on the basis of the first embodiment, as shown in Figure 1 , in this example, the bottom of the slurry bucket 4 adopts a reverse conical surface that continuously decreases from the center to the periphery, and the suction head 151 and the scraper 6 are located at the bottom near the bucket wall.

[0049] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any changes or replacements within the technical range disclosed by the present application can be easily thought by those skilled in the art, which should be covered within the protection scope of the present application.

Claims

1. A pressure grouting device for repairing concrete cracks, characterized in that, The system includes a trolley, a fixed bracket, a movable bracket, a slurry tank, a sleeve, a scraper, a grouting pump, a first pipe fitting, a second pipe fitting, a third pipe fitting, a driving pulley, a driven pulley, a transmission belt connecting the driving and driven pulleys, a spray bar with a nozzle, a suction bar with a suction head, a rotating bracket for fixing the suction bar and the scraper, and a connecting seat and a shaft tube with a central cavity. The fixed bracket and the grouting pump are fixedly connected to the trolley. The movable bracket is detachably connected to the upper end of the fixed bracket. The driving pulley and the shaft tube are respectively fixedly and rotatably mounted on the movable bracket. The driven pulley is fixedly connected to the sleeve, and the sleeve is rotatably fitted onto the shaft tube. The outer side of the tube is rotatably supported on a fixed bracket. The connecting seat is concentrically connected to the inner side of the sleeve and is rotatably sealed at the upper end in the cavity at the lower end of the shaft tube. The rotating bracket is fixedly connected to the outer side of the sleeve and the lower edge of the scraper is attached to the bottom surface of the slurry tank, with the suction head slightly higher than the bottom surface of the tank and facing the scraper. The two ends of the first tube are respectively connected to the suction rod and the lower end of the connecting seat. The two ends of the second tube are respectively connected to the upper end of the shaft tube and the slurry inlet of the grouting pump. The two ends of the third tube are respectively connected to the slurry outlet of the grouting pump and the spray bar. The slurry in the slurry tank is sprayed out through the suction rod, the first tube, the connecting seat, the shaft tube, the second tube, the grouting pump, the third tube, and the spray bar.

2. The pressurized grouting device for repairing concrete cracks according to claim 1, characterized in that, The driven pulley is fixedly sleeved in the upper inner cavity of the sleeve, and is rotatably sleeved on the outside of the shaft tube through the first rolling bearing.

3. The pressurized grouting device for repairing concrete cracks according to claim 2, characterized in that, The pressurized grouting device further includes a first bearing seat assembly, which includes a first planar bearing, a first planar bearing seat fixedly connected to a fixed bracket, a first sealing ring sealed to the outer periphery of the sleeve, and a first planar bearing cover with the first sealing ring. The upper end of the first bearing seat is provided with a first planar bearing mounting cavity for placing the first planar bearing. The loose ring of the first planar bearing is tightly fitted and axially positioned in the first planar bearing mounting cavity. The first bearing cover is closed on the opening at the upper end of the first planar bearing mounting cavity. The lower end of the first planar bearing seat is provided with a through hole slightly larger than the outer diameter of the sleeve. A sealing groove is provided on the wall of the through hole. The first sealing ring is located in the sealing groove. The sleeve seals through the first planar bearing cover, is tightly fitted to the tight ring of the first planar bearing, and is loosely fitted to the loose ring of the first planar bearing. It also seals through the through hole and extends downwards through the lower end of the first bearing seat, so that the sleeve is rotatably supported on the fixed bracket.

4. The pressurized grouting device for repairing concrete cracks according to claim 3, characterized in that, The pressurized grouting device further includes a second bearing housing assembly, which comprises a second planar bearing, a second rolling bearing, a second rolling bearing housing, a second planar bearing housing, a second sealing ring sealingly connected to the outer circumference of the shaft tube, a third sealing ring sealingly connected to the outer circumference of the connecting seat, a second planar bearing cover, and a second rolling bearing cover. The lower end of the second planar bearing housing has a shoulder, and the upper end is a journal smaller than the shoulder. The journal end has a second planar bearing mounting cavity for placing the second planar bearing. The loose ring of the second planar bearing is tightly fitted and axially positioned in the second planar bearing mounting cavity. The upper end of the second rolling bearing housing has a second rolling bearing mounting cavity for placing the second rolling bearing, and the lower end has a mounting cavity for connecting the second planar bearing. The journal of the housing is fitted with a plug-in cavity. The outer ring of the second rolling bearing is tightly fitted and axially positioned in the second rolling bearing mounting cavity. The journal of the second flat bearing housing is inserted into the plug-in cavity. The shoulder is positioned and connected to the lower end of the second rolling bearing housing. The second flat bearing cover and the second rolling bearing cover respectively cover the openings of the second flat bearing mounting cavity and the second rolling bearing mounting cavity. The second bearing housing assembly is concentrically connected in the inner cavity of the lower end of the sleeve through the second rolling bearing housing. The shaft tube seal passes through the second rolling bearing cover and is tightly fitted to the inner ring of the second rolling bearing. The connecting seat seal passes through the second flat bearing cover and is loosely fitted to the loose ring of the second flat bearing and is tightly fitted to the tight ring of the second flat bearing. Its upper end is rotatably sealed to the inner cavity of the shaft tube.

5. The pressurized grouting device for repairing concrete cracks according to claim 1, characterized in that, The fixed support includes two vertical rods, a first mounting frame horizontally connected to the upper ends of the two vertical rods and used to connect the movable support, a second mounting frame horizontally connected to the two vertical rods and located below the first mounting frame, and at least one set of impeller positioning components; each set of impeller positioning components includes two right-angled triangular pads, a center positioning screw and a side positioning screw respectively provided at one end, and a connecting rod and a side rod respectively provided with connecting holes. The two right-angled triangular pads have through holes at different positions on a right-angled side surface, with the axis perpendicular to the right-angled side surface. A connecting rod connects to the lower part of the first mounting frame. Between the two vertical rods below the second mounting frame, the side rods are connected to the outside of the two vertical rods at the same height as the connecting rod. The center positioning screw is screwed onto the connecting rod through the connecting hole and nut. Two right-angled triangular pads with their hypotenuses facing each other are set on both sides of the connecting hole on the side rod. The side positioning screw passes through the through hole on the two right-angled triangular pads and the connecting hole on the side rod and is connected to the side rod, so that the side positioning screw is in the radial direction of the slurry tank, and the positioning heads of the side positioning screws on the two side rods and the center positioning screw on the connecting rod are in the positioning position on the outer periphery of the slurry tank concentric with the shaft tube.

6. The pressurized grouting device for repairing concrete cracks according to claim 1, characterized in that, The drive pulley and shaft tube are respectively fixed and rotatably connected to the movable bracket via a shaft assembly and a shaft seat. The shaft assembly includes a rotating shaft, a third rolling bearing, and a third rolling bearing seat connected to the movable bracket. The rotating shaft is rotatably connected to the third rolling bearing seat via the third rolling bearing, and the upper and lower ends of the rotating shaft are respectively located above and below the movable bracket. The drive pulley is connected to the rotating shaft located below the movable bracket. The shaft seat has a mounting hole adapted to the outer diameter of the shaft tube, and the wall of the mounting hole has a radially arranged limiting screw hole. The upper end of the shaft tube has an external thread. The upper end of the shaft tube is inserted into the mounting hole of the shaft seat, and the upper external thread is located at the upper end of the mounting hole of the shaft seat. The shaft tube is axially positioned by screwing on a nut. The shaft tube has at least one radially arranged limiting slot at the height position of the upper limiting screw hole of the shaft seat in the circumferential direction. The end of the limiting screw is screwed into the limiting screw hole and is at least in the limiting slot, so that the shaft tube is circumferentially positioned in the shaft seat.

7. The pressurized grouting device for repairing concrete cracks according to claim 1, characterized in that, The scraper is positioned on the rear side of the suction head as it rotates circumferentially, allowing the mud to be scraped to the suction port of the suction head.

8. The pressurized grouting device for repairing concrete cracks according to claim 7, characterized in that, The suction nozzle is oriented vertically downwards or in the opposite direction to the rotation of the scraper and the suction nozzle.

9. The pressurized grouting device for repairing concrete cracks according to claim 1, characterized in that, The first fitting includes multiple first connecting pipes and multiple first connecting pipe heads for connecting the suction rod and the connecting seat.

10. The pressurized grouting device for repairing concrete cracks according to claim 1, characterized in that, The bottom of the slurry tank is an inverted conical surface that gradually decreases in size from the center outwards, and the suction head and scraper are located on the bottom of the tank near the side of the tank wall.

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