Maintenance device for highway bridge expansion joint

Abstract

The invention belongs to the technical field of bridge maintenance, and relates to a highway bridge expansion joint maintenance device which comprises a moving frame, a holding rod connected to the first end of the moving frame and a cleaning brush assembly arranged on the lower portion of the moving frame. The first end and the second end of the movable frame are connected with two rear legs and two front legs respectively, and rotating rear wheels and rotating front wheels are arranged on the lower portions of the rear legs and the lower portions of the front legs respectively. When the movable frame is transferred to the upper side of the expansion joint and front wheels and rear wheels make contact with the ground, the covering plate can automatically and synchronously cover the upper side of the expansion joint, the corrugated pipe can automatically and synchronously stretch into the expansion joint, and maintenance is convenient; the holding rod pries the movable frame to drive the front wheel to leave the ground, the covering frame is driven to move upwards to leave the expansion joint under the action of the spring and the lever, meanwhile, the corrugated pipe is moved out of the expansion joint, the movable frame is conveniently reversed and transferred to leave the expansion joint, use is flexible, and complex expansion system control is omitted.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge maintenance, and in particular relates to a maintenance device for expansion joints of highway bridges. Background Art

[0002] Expansion joints are essential components of highway bridge construction. Their primary function is to accommodate deformation caused by factors such as temperature fluctuations, vehicle loads, and earthquakes. Once constructed, expansion joints need to be cleaned and filled with a sealant. This sealant can adapt to deformation and contraction of the substrate, provides excellent adhesion, effectively resolves structural leaks, and prevents impurities from entering the joint.

[0003] For example, patent publication number CN113026582A discloses a material filling device for repairing the settlement of bridge expansion joints and a method for using the same. The filling device controls the first electric push rod to drive the nylon roller to move down to the repair area for cleaning, and then controls the third motor to drive the fan gear to make the transmission gear plate drive the filling head to move down to the repair area for repair. Before and after work, cumbersome telescopic system control is required, and the nylon roller and the filling head cannot be automatically moved down to the repair area after the device is moved into place, resulting in cumbersome operation.

[0004] In view of the shortcomings of the above-mentioned prior art, a maintenance device for expansion joints of highway bridges is designed to overcome the shortcomings of the prior art. After being placed in position, the device automatically and synchronously covers the expansion joint with a covering frame and extends the corrugated pipe into the expansion joint. The device is simple to operate, convenient to transfer, and highly flexible. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a maintenance device for expansion joints of highway bridges which automatically and synchronously covers the expansion joint with a covering frame and extends the bellows into the expansion joint after being placed in position, is simple to operate, convenient to transfer, and has high flexibility.

[0006] In order to solve the above technical problems, the present invention provides a maintenance device for expansion joints of highway bridges, comprising a mobile frame, a gripping rod connected to the first end of the mobile frame, and a cleaning brush assembly arranged at the lower part of the mobile frame. The mobile frame is provided with a filling joint assembly, and the filling joint assembly has a bellows for spraying a caulking agent, so that the mobile frame moves along the expansion joint from right to left to perform a maintenance operation of first cleaning and then filling. The first end and the second end (left end) of the mobile frame are respectively connected to two rear legs and two front legs, and the lower parts of the rear legs and the lower parts of the front legs are respectively provided with rotating rear wheels and front wheels, and the rear wheels and the front wheels are used to assist the movement of the mobile frame; a support plate is connected between the sides of the two rear legs that are close to each other, and the support plate A covering frame is provided on the upper sliding surface surrounding the bellows, and the lower end of the covering frame is in the shape of a flat plate. The covering frame covers the upper side of the expansion joint so that when the bellows sprays the caulking agent, the excess caulking agent can be smoothed and the caulking agent can be prevented from leaking out of the expansion joint. A connecting plate is connected between the covering frame and the bellows. When the covering frame moves down to the upper side of the expansion joint, the bellows will be driven to extend into the expansion joint through the connecting plate. When the covering frame moves up and away from the expansion joint, the bellows will be driven to move out of the expansion joint through the connecting plate. The upper part of the covering frame is connected to two front-to-back opposite transmission rods, and the moving frame is connected to two front-to-back opposite pillars. A lever is rotatable on the pillar, and the first and second ends of the lever are provided with waist-shaped grooves. The waist-shaped groove at the first end of the lever surrounds the pillar. When the left end of the lever swings up, the right end of the lever will swing down and squeeze the transmission rod through the waist-shaped groove to drive the cover frame to move down to a working state. A sliding column slides at the lower part of the front leg, and the front wheel rotation is arranged on the lower side of the sliding column. The two sliding columns are connected to each other on one side with a U-shaped interference rod. The waist-shaped groove at the second end of the lever surrounds the interference rod. When the mobile frame is transferred to the upper side of the expansion joint and the front and rear wheels are in contact with the ground, the front wheel will drive the sliding column to move up along the front leg, and the sliding column will squeeze the waist-shaped groove of the lever through the interference rod to make the left end of the lever swing up. The right end of the lever will drive the cover frame to move down through the transmission rod to cover the upper side of the expansion joint. The bellows is driven down into the expansion joint through the connecting plate, and a spring located in the front leg is connected between the sliding column and the front leg. The spring is used to allow the sliding column that moves up along the front leg to move down and reset along the front leg. After the maintenance operation of cleaning and filling the expansion joint is completed, the right end of the mobile frame is levered by the gripping rod to swing down with the rear wheel as the fulcrum. At this time, the left end of the mobile frame will drive the sliding column to swing up through the front leg, and the sliding column will drive the front wheel to leave the ground. At this time, the slide will move down along the front leg under the action of the spring, and at the same time, the resistance rod will squeeze the waist groove of the lever to make the left end of the lever swing down, and the right end of the lever will drive the cover frame to move up and away from the expansion joint through the transmission rod, and the cover frame will drive the bellows to move out of the expansion joint through the connecting plate.

[0007] Preferably, the cleaning brush assembly includes a protective shell connected to the lower part of the movable frame, and a brush roller is provided at the lower part of the protective shell for cleaning impurities in the expansion joint. A fan is installed on the side of the protective shell close to the rear wheel, and the air outlet of the fan is facing the brush roller. When the movable frame moves from right to left along the expansion joint, the fan blows air to cooperate with the brush roller to further clean the impurities in the expansion joint, so that the impurities are away from the bellows.

[0008] Preferably, it also includes a drive motor installed on the protective shell, the output shaft of the drive motor is connected to the fan blade shaft of the fan, and the fan blade shaft and the brush roller are driven by a synchronous belt group, so that when the drive motor is controlled to drive the fan to spray air, the brush roller is automatically and synchronously rotated clockwise through the transmission of the synchronous belt group to clean impurities in the expansion joint.

[0009] Preferably, the filling seam assembly includes a liquid storage tank and a pump body installed on the upper part of the mobile frame. The liquid storage tank is equipped with an electric heater, which is used to heat the liquid storage tank to maintain the activity of the sealant in the liquid storage tank. The input pipe of the pump body is connected to the liquid storage tank, and the output pipe of the pump body is connected to the infusion pipe. The pump body is controlled to pump the sealant in the liquid storage tank into the infusion pipe. The bellows is connected to the lower end of the infusion pipe, and the bellows is suitable for spraying the sealant in the infusion pipe.

[0010] Preferably, a nozzle connected to the lower end of the bellows is further included. The nozzle is tilted, and the tilt direction of the lower end of the nozzle is away from the cleaning brush assembly. The caulking agent sprayed from the bellows will flow out from the nozzle.

[0011] Preferably, it also includes two front-to-rear opposite electric guide rails installed on the second end of the moving frame, a support frame is connected between the two electric sliders, a servo motor is installed on the upper side of the support frame, the output shaft of the servo motor is connected to a rotating shaft that rotates through the support frame, and the lower end of the rotating shaft is connected to two left and right opposite cleaning scrapers. When the moving frame is transferred to the upper side of the expansion joint and the front wheel and the rear wheel are in contact with the ground, the cleaning scraper will be transferred into the expansion joint, and the electric guide rail is controlled to drive the support frame to drive the rotating shaft to rise and fall, and the rotating shaft will drive the cleaning scraper to rise and fall, thereby adjusting the height of the cleaning scraper so that the cleaning scraper contacts the bottom surface of the expansion joint. At this time, in the process of the moving frame moving from right to left along the expansion joint, the servo motor is controlled to drive the rotating shaft to drive the cleaning scraper to swing back and forth at a predetermined angle.

[0012] Preferably, it also includes two front and rear opposing guide frames provided on the support frame, a slider sliding on the guide frame, and a cleaning scraper 2 connected to the lower side of the slider, and the lower side of the cleaning scraper 2 is flush with the lower side of the cleaning scraper 1. The lifting of the support frame will drive the cleaning scraper 2 and the cleaning scraper 1 to rise and fall synchronously in the expansion joint through the guide frame, and a movable screw rod that runs through the support frame is rotated on the guide frame, and the screw rod is threadedly connected to the slider. The rotating screw rod drives the slider to move, and the slider drives the cleaning scraper 2 to move, so that the cleaning scraper 2 is close to the side of the expansion joint, and then when the movable frame moves from right to left, the cleaning scraper 2 will move synchronously to clean impurities on the side of the expansion joint.

[0013] Preferably, it also includes a resistance block connected to the slider, the guide frame slides on the support frame, the upper end of the rotating shaft is connected to the resistance frame, and two waist grooves are opened on the resistance frame, and the two waist grooves on the resistance frame respectively surround the resistance blocks on the two sliders. When the rotating shaft drives the cleaning scraper to swing back and forth for cleaning, the rotating shaft will also drive the resistance frame to swing back and forth, and the resistance frame will squeeze the resistance block through the waist groove thereon. When the rotating shaft swings clockwise and the resistance frame squeezes the front resistance block to move left, the front resistance block will drive the front guide frame and the rear cleaning scraper 2 to move left through the front slider, and at the same time, the resistance frame squeezes the rear resistance block to move right, and the rear resistance block will drive the rear guide frame and the rear cleaning scraper 2 to move right through the rear slider.

[0014] The present invention overcomes the shortcomings of the prior art and has the following beneficial effects: 1. When the mobile frame is moved to the upper side of the expansion joint and the front and rear wheels are in contact with the ground, the cover plate will automatically and synchronously cover the upper side of the expansion joint, and the bellows will automatically and synchronously extend into the expansion joint, making maintenance easier. The grip lever is used to pry the mobile frame to drive the front wheel off the ground. Under the action of the spring and lever, the cover frame is driven to move up and away from the expansion joint. At the same time, the bellows is moved out of the expansion joint, thereby conveniently changing direction and moving the mobile frame away from the expansion joint. It is flexible to use and eliminates the need for complex telescopic system control.

[0015] 2. When the mobile frame moves from right to left along the expansion joint, use the fan to blow air to blow away impurities, and use the brush roller to rotate clockwise to clean the impurities in the expansion joint, so as to facilitate the subsequent operation of filling the expansion joint with the sealant through the corrugated pipe and ensure the contact between the sealant and the expansion joint.

[0016] 3. In order to improve the cleaning effect and efficiency, only controlling the servo motor can drive the cleaning scraper 1 to swing back and forth to clean the bottom surface of the expansion joint, and automatically drive the cleaning scraper 2 to move back and forth to clean the side of the expansion joint; in addition, both the cleaning scraper 1 and the cleaning scraper 2 can be adaptively adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an assembly diagram of the present invention.

[0018] Figure 2 It is the front view of the present invention.

[0019] Figure 3 It is a cross-sectional view of the front leg of the present invention.

[0020] Figure 4 Schematic diagram of the pump body, infusion tube and bellows of the present invention.

[0021] Figure 5 Schematic diagram of the brush roller, fan and synchronous belt assembly of the present invention.

[0022] Figure 6 It is a left-side schematic diagram of the present invention.

[0023] Figure 7 Schematic diagram of the servo motor, rotating shaft and cleaning scraper of the present invention.

[0024] Figure 8 Schematic diagram of the guide frame, screw rod and cleaning scraper 2 of the present invention.

[0025] The marks in the drawings provided by the present invention are: 1-mobile frame, 10-grip, 11-front leg, 12-front wheel, 13-hind leg, 14-rear wheel, 2-cleaning brush assembly, 21-protective shell, 22-brush roller, 23-fan, 24-synchronous belt group, 25-drive motor, 31-liquid storage tank, 32-pump body, 33-infusion tube, 34-bellows, 35-sprinkler, 41-support plate, 42-cover frame, 43-connecting plate, 44-transmission rod, 45-pillar, 46-lever, 47-sliding column, 48-resistance rod, 49-spring, 51-electric guide rail, 52-support frame, 53-servo motor, 54-rotating shaft, 55-cleaning scraper 1, 61-guide frame, 62-screw rod, 63-cleaning scraper 2, 64-slider, 71-resistance block, 72-resistance frame. DETAILED DESCRIPTION

[0026] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0027] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The technical solutions of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. It should be noted that the technical features involved in the different embodiments of the present invention described below may be combined with one another as long as they do not conflict with one another.

[0028] A maintenance device for expansion joints of highway bridges, such as Figure 1-Figure 3 As shown, it includes a mobile frame 1, a handle 10 connected to the first end (right end) of the mobile frame 1, and a cleaning brush assembly 2 provided at the bottom of the mobile frame 1. The cleaning brush assembly 2 is used to pre-clean the expansion joint before filling it with a filler. The mobile frame 1 is provided with a filling joint assembly, which has a bellows 34 for spraying the filler, so that the mobile frame 1 moves along the expansion joint from right to left to perform a maintenance operation of first cleaning and then filling. The first end and the second end (left end) of the mobile frame 1 are respectively connected to two rear legs 13 and two front legs 11. The lower parts of the rear legs 13 and the lower parts of the front legs 11 are respectively provided with rotating rear wheels 14 and front wheels 12, which are used to assist the movement of the mobile frame 1; A support plate 41 is connected between the sides of the two rear legs 13 that are close to each other. A covering frame 42 that slides on the support plate 41 surrounds the bellows 34. The lower end of the covering frame 42 is flat. The covering frame 42 covers the upper side of the expansion joint so that when the bellows 34 sprays the caulking agent, it can both smooth out the excess caulking agent and prevent the caulking agent from leaking out of the expansion joint. A connecting plate 43 is connected between the covering frame 42 and the bellows 34. When the covering frame 42 moves down to the upper side of the expansion joint, the bellows 34 will be driven to extend into the expansion joint through the connecting plate 43. When the covering frame 42 moves up and away from the expansion joint, the bellows 34 will be driven to move out of the expansion joint through the connecting plate 43, thereby working synchronously. The upper part of the covering frame 42 is connected to two front-to-back opposite transmission rods 44, and the mobile frame 1 is connected to two front-to-back opposite pillars 45. A lever 46 is rotated on the pillar 45. The first end (right end) and the second end (left end) of the lever 46 are both provided with a waist-shaped groove. The waist-shaped groove of the first end of the lever 46 surrounds the pillar 45. When the left end of the lever 46 is swung up, the right end of the lever 46 will swing down and squeeze the transmission rod 44 through the waist-shaped groove to drive the covering frame 42 to move down to a working state. The lower part of the front leg 11 is slid with a sliding column 47, and the front wheel 12 is rotated on the lower side of the sliding column 47. The two The sliding columns 47 are connected to the sides close to each other with a U-shaped interference rod 48. The waist groove of the second end of the lever 46 surrounds the interference rod 48. When the mobile frame 1 is transferred to the upper side of the expansion joint and the front wheel 12 and the rear wheel 14 are in contact with the ground, the front wheel 12 will drive the sliding column 47 to move up along the front leg 11. The sliding column 47 will squeeze the waist groove of the lever 46 through the interference rod 48 to make the left end of the lever 46 swing up. The right end of the lever 46 will drive the covering frame 42 to move down through the transmission rod 44 to cover the upper side of the expansion joint. At the same time, the covering frame 42 drives the bellows through the connecting plate 43 34 moves down into the expansion joint, so that after being placed in position, the covering frame 42 and the bellows 34 are automatically and synchronously put into place, eliminating the step of controlling the operation of electric actuators such as cylinders, and ensuring that the covering frame 42 covers the upper side of the expansion joint. A spring 49 located in the front leg 11 is connected between the sliding column 47 and the front leg 11. The spring 49 is used to allow the sliding column 47 that moves up along the front leg 11 to move down and reset along the front leg 11. After the maintenance operation of cleaning and filling the expansion joint is completed, the right end of the mobile frame 1 is pried by the grip 10 with the rear wheel 14 as the fulcrum to swing down. At this time The left end of the mobile frame 1 will drive the sliding column 47 to swing upward through the front leg 11, and the sliding column 47 will drive the front wheel 12 to leave the ground. At this time, the slide will move down along the front leg 11 under the action of the spring 49. At the same time, the resistance rod 48 will squeeze the waist groove of the lever 46 to make the left end of the lever 46 swing down. The right end of the lever 46 will drive the covering frame 42 to move up and away from the expansion joint through the transmission rod 44. The covering frame 42 will drive the bellows 34 to move out of the expansion joint through the connecting plate 43, so as to conveniently change direction and transfer the mobile frame 1 to leave the expansion joint. It is flexible to use and eliminates the need for complex telescopic system control.

[0029] like Figure 2 and Figure 5 As shown, the cleaning brush assembly 2 includes a protective shell 21 connected to the lower part of the mobile frame 1, and a brush roller 22 is provided at the lower part of the protective shell 21 for cleaning impurities in the expansion joint. A fan 23 is installed on the side of the protective shell 21 close to the rear wheel 14, and the air outlet of the fan 23 is facing the brush roller 22. When the mobile frame 1 moves from right to left along the expansion joint, the fan 23 blows air to cooperate with the brush roller 22 to further clean the impurities in the expansion joint, so that the impurities are away from the bellows 34, thereby facilitating the subsequent operation of filling the expansion joint with the sealant through the bellows 34 to ensure the contact between the sealant and the expansion joint.

[0030] like Figure 2 and Figure 5 As shown, it also includes a drive motor 25 installed in the protective shell 21, the output shaft of the drive motor 25 is connected to the blade shaft of the fan 23, and the blade shaft of the fan 23 and the brush roller 22 are driven by a synchronous belt group 24. When the drive motor 25 is controlled to drive the fan 23 to spray air, the brush roller 22 is automatically and synchronously rotated clockwise through the transmission of the synchronous belt group 24 to clean impurities in the expansion joint.

[0031] like Figure 2 and Figure 3 As shown, the filling seam assembly includes a liquid storage tank 31 and a pump body 32 installed on the upper part of the mobile frame 1. The liquid storage tank 31 is equipped with an electric heater, which is used to heat the liquid storage tank 31 to maintain the activity of the sealant in the liquid storage tank 31. The input pipe of the pump body 32 is connected to the liquid storage tank 31, and the output pipe of the pump body 32 is connected to the infusion pipe 33. The pump body 32 is controlled to pump the sealant in the liquid storage tank 31 into the infusion pipe 33. The bellows 34 is connected to the lower end of the infusion pipe 33, and the bellows 34 is suitable for spraying the sealant in the infusion pipe 33.

[0032] like Figure 4 As shown, it also includes a nozzle 35 connected to the lower end of the bellows 34. The nozzle 35 is set at an angle, and the inclination direction of the lower end of the nozzle 35 is away from the cleaning brush assembly 2. The filler sprayed from the bellows 34 will flow out from the nozzle 35, thereby guiding the filler to flow back to the cleaning area to ensure uniform coverage.

[0033] like Figure 6 and Figure 3 As shown, it also includes two electric guide rails 51 mounted on the second end of the mobile frame 1, which are opposite to each other in front and back. A support frame 52 is connected between the sliders 64 of the two electric guide rails 51. A servo motor 53 is mounted on the upper side of the support frame 52. The output shaft of the servo motor 53 is connected to a rotating shaft 54 ​​that rotates and passes through the support frame 52. The lower end of the rotating shaft 54 ​​is connected to two left and right opposite cleaning scrapers 55. When the mobile frame 1 is transferred to the upper side of the expansion joint and the front wheel 12 and the rear wheel 14 are in contact with the ground, the cleaning scrapers 55 are It will be transferred to the expansion joint, and the electric guide rail 51 will be controlled to drive the support frame 52 to drive the rotating shaft 54 ​​to rise and fall. The rotating shaft 54 ​​will drive the cleaning scraper 55 to rise and fall, so as to adjust the height of the cleaning scraper 55 so that the cleaning scraper 55 contacts the bottom surface of the expansion joint. At this time, in the process of the movable frame 1 moving from right to left along the expansion joint, the servo motor 53 is controlled to drive the rotating shaft 54 ​​to drive the cleaning scraper 55 to swing back and forth at a predetermined angle, so as to clean the stubborn dirt and other impurities in the expansion joint, thereby improving the maintenance effect of the expansion joint.

[0034] like Figure 6-Figure 8As shown, it also includes two front and rear opposite guide frames 61 provided on the support frame 52, and a slider 64 slides on the guide frame 61. The lower side of the slider 64 is connected to the cleaning scraper 2 63, and the lower side of the cleaning scraper 2 63 is flush with the lower side of the cleaning scraper 1 55. The lifting of the support frame 52 will drive the cleaning scraper 2 63 and the cleaning scraper 1 55 to rise and fall synchronously in the expansion joint through the guide frame 61. A screw rod 62 that is movable and passes through the support frame 52 is rotated on the guide frame 61, and the screw rod 62 is threadedly connected to the slider 64. The rotating screw rod 62 drives the slider 64 to move, and the slider 64 drives the cleaning scraper 2 63 to move, so that the cleaning scraper 2 63 is close to the side of the expansion joint, and then when the movable frame 1 moves from right to left, the cleaning scraper 2 63 will move synchronously to clean the impurities on the side of the expansion joint.

[0035] like Figure 7 and Figure 8 As shown, it also includes a resistance block 71 connected to the slider 64, the guide frame 61 slides on the support frame 52, and the upper end of the rotating shaft 54 ​​is connected to the resistance frame 72. The resistance frame 72 has two waist grooves. The two waist grooves on the resistance frame 72 respectively surround the resistance blocks 71 on the two sliders 64. When the rotating shaft 54 ​​drives the cleaning scraper 55 to swing back and forth for cleaning, the rotating shaft 54 ​​will also drive the resistance frame 72 to swing back and forth. The resistance frame 72 will squeeze the resistance block 71 through the waist groove on it. When the contact frame 72 swings clockwise and squeezes the front contact block 71 to move left, the front contact block 71 drives the front guide frame 61 and the rear cleaning scraper 2 63 to move left through the front slider 64. At the same time, the contact frame 72 squeezes the rear contact block 71 to move right, and the rear contact block 71 drives the rear guide frame 61 and the rear cleaning scraper 2 63 to move right through the rear slider 64, and vice versa. In this way, the cleaning scraper 2 63 is driven to move back and forth to automatically and efficiently clean the side of the expansion joint.

[0036] Obviously, the embodiments described above are only part of the embodiments of the present invention, rather than all the embodiments. They only express the preferred implementation methods of the present invention and the description is relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention.

[0037] It should be pointed out that, for ordinary technicians in this field, several variations, increases and decreases in quantity, improvements and substitutions can be made without departing from the concept of the present invention. Therefore, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

Claims

1. A maintenance device for expansion joints of highway bridges, comprising a mobile frame (1), a gripping rod (10) connected to a first end of the mobile frame (1), and a cleaning brush assembly (2) provided at a lower portion of the mobile frame (1), wherein a filling joint assembly is provided on the mobile frame (1), and a bellows (34) is provided in the filling joint assembly, characterized in that: The mobile frame (1) further comprises: two rear legs (13) and two front legs (11) are connected to the first and second ends thereof, respectively; the lower parts of the rear legs (13) and the lower parts of the front legs (11) are provided with rotating rear wheels (14) and front wheels (12), respectively; a support plate (41) is connected to one side of the rear legs (13); a cover frame (42) is slidably provided on the support plate (41) and surrounds the corrugated pipe (34); a connecting plate (43) is connected between the cover frame (42) and the corrugated pipe (34); a transmission rod (44) is connected to the cover frame (42); and the mobile frame (1) A support (45) is connected to the upper portion, and a lever (46) is rotatably provided on the support (45). The first end and the second end of the lever (46) are both provided with waist-shaped grooves. The waist-shaped groove of the first end of the lever (46) surrounds the support (45). A sliding column (47) slides on the lower portion of the front leg (11). The front wheel (12) is rotatably provided on the lower side of the sliding column (47). A resistance rod (48) is connected to one side of the sliding column (47). The waist-shaped groove of the second end of the lever (46) surrounds the resistance rod (48). A spring (49) is connected between the sliding column (47) and the front leg (11).

2. A maintenance device for expansion joints of highway bridges according to claim 1, characterized in that: The cleaning brush assembly (2) comprises a protective shell (21) connected to the lower part of the mobile frame (1), a brush roller (22) is provided at the lower part of the protective shell (21), and a fan (23) is installed on the side of the protective shell (21) close to the rear wheel (14), with the air outlet of the fan (23) facing the brush roller (22).

3. A maintenance device for expansion joints of highway bridges according to claim 2, characterized in that: The invention also includes a driving motor (25) installed on the protective shell (21), wherein the output shaft of the driving motor (25) is connected to the fan shaft of the fan (23), and the fan shaft of the fan (23) and the brush roller (22) are driven by a synchronous belt group (24).

4. The maintenance device for expansion joints of highway bridges according to claim 1, characterized in that: The filling seam assembly comprises a liquid storage tank (31) and a pump body (32) mounted on the mobile frame (1); the liquid storage tank (31) has an electric heater built in; an input pipe of the pump body (32) is connected to the liquid storage tank (31); an output pipe of the pump body (32) is connected to a liquid infusion pipe (33); and the bellows (34) is connected to the lower end of the liquid infusion pipe (33).

5. A maintenance device for expansion joints of highway bridges according to claim 4, characterized in that: It also includes a nozzle (35) connected to the lower end of the bellows (34), the nozzle (35) being arranged at an angle, with the inclination direction of the lower end of the nozzle (35) facing away from the cleaning brush assembly (2).

6. The maintenance device for expansion joints of highway bridges according to claim 1, characterized in that: The invention also includes an electric guide rail (51) mounted on the second end of the movable frame (1), the electric slider (64) is connected to the support frame (52), a servo motor (53) is mounted on the support frame (52), the output shaft of the servo motor (53) is connected to the rotating shaft (54), and the lower end of the rotating shaft (54) is connected to two opposing cleaning scrapers (55).

7. A maintenance device for expansion joints of highway bridges according to claim 6, characterized in that: The invention also includes two front-to-rear opposing guide frames (61) provided on the support frame (52), a slider (64) sliding on the guide frame (61), a second cleaning scraper (63) connected to the lower side of the slider (64), a screw rod (62) rotatably passing through the support frame (52) on the guide frame (61), and the screw rod (62) is threadedly connected to the slider (64).

8. A maintenance device for expansion joints of highway bridges according to claim 7, characterized in that: The invention also includes a resistance block (71) connected to the slider (64), the guide frame (61) slides on the support frame (52), the rotating shaft (54) is connected to a resistance frame (72), and the resistance frame (72) is provided with two waist grooves, and the two waist grooves on the resistance frame (72) respectively surround the resistance blocks (71) on the two sliders (64).

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