Pavement crack repairing device for road maintenance

Abstract

The invention discloses a pavement crack repairing device for road maintenance. The pavement crack repairing device comprises a movable frame; the self-position-adjusting assembly is arranged below the movable frame; when the road surface is bent downwards, the scraping block and the scraping strip are pushed downwards by the elastic force of the first spring, so that the scraping block and the scraping strip are always kept in a state of being attached to the road surface, and when the scraping block and the scraping strip encounter a section of the road surface which protrudes upwards, the scraping block and the scraping strip are driven by the elastic force of the first spring to be attached to the road surface. The scraping block and the scraping strip can be subjected to upward pushing force at the protruding road surface, so that the first connecting rod and the second connecting rod are pushed upwards, the scraping block or the scraping strip can smoothly move to the position above the road surface along with the road surface protrusion, and the scraping block and the scraping strip can be automatically attached to the surface of the road surface according to the curvature of the road surface. And the situation that the scraping block and the scraping strip cannot scrape the repairing liquid in the bent and uneven road crack is avoided, and the using flexibility and applicability of the device are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of road crack repair, and specifically relates to a road crack repair device for road maintenance. Background Art

[0002] A road refers to a passage for various vehicles and pedestrians, widely referring to various types of traffic channels. The types of roads are more extensive, including urban roads, rural roads, sidewalks, bicycle lanes, etc. It is an important part of transportation infrastructure and plays a key role in transportation, economic development, and social activities. Road maintenance is an important task to ensure the safety, smoothness, and extension of the service life of highways and urban roads. Effective road maintenance can not only improve traffic safety but also reduce repair costs. Regularly sealing the cracks on the road surface to prevent further damage caused by the entry of water and soil also belongs to the scope of road maintenance work.

[0003] The existing patent with publication number CN202311820006.9 discloses an asphalt road crack repair device, belonging to the technical field of road maintenance equipment, including a frame. A working box is arranged on the top surface of the frame. An asphalt storage tank and a cleaning and storage box are arranged inside the working box. A stirring mechanism is arranged inside the asphalt storage tank. A discharge pipe, a guide plate, and a leveling frame are arranged on the right side of the asphalt storage tank. A lifting mechanism is arranged inside the cleaning and storage box. A road surface cleaning assembly, a crack cleaning assembly, a crack sweeping assembly, a first dust removal assembly, and a second dust removal assembly are arranged below the lifting mechanism. A dust removal box and a dust removal tank are arranged on the front side of the working box. Through the road surface cleaning assembly, the crack cleaning assembly, and the crack sweeping assembly, the dust around and inside the cracks is thoroughly cleaned. Through the first dust removal assembly and the second dust removal assembly, the dust is sent into the dust removal tank, and the wet mesh plate is used to wet the dust and gravel to prevent the dust and gravel from floating, achieving the effect of dust reduction.

[0004] The leveling frame in the above-mentioned disclosed road crack repair device can only be used on straight and smooth roads. When encountering an up-and-down curved road, the leveling frame cannot fit on the uneven road surface, and thus cannot scrape the repair liquid in the curved and uneven road cracks. When encountering an upward convex curved road surface, the leveling frame will get stuck at the edge of the upward curved road surface and cannot be pushed forward, resulting in the poor advancement of the entire device. When encountering a downward concave curved road surface, the bottom of the leveling frame cannot touch the road surface. Summary of the Invention

[0005] The purpose of the present invention is to provide a road crack repair device for road maintenance, which solves the problem that the leveling frame in the traditional road crack repair device can only be used on straight and smooth roads. When encountering an up-and-down curved road, the leveling frame cannot fit on the uneven road surface, and thus cannot scrape the repair liquid in the curved and uneven road cracks.

[0006] The present invention solves the above technical problems through the following technical solutions. The present invention includes: A mobile frame; An automatic positioning component. The automatic positioning component is arranged below the mobile frame. The automatic positioning component enables the repair component to always fit on the uneven road surface. The automatic positioning component includes a leveling piece. The leveling piece includes a rectangular connecting frame. A plurality of first connecting rods slide inside the rectangular connecting frame. One end of each of the plurality of first connecting rods is fixed with a leveling block. Scraper strips are arranged on both sides below the rectangular connecting frame. A plurality of second connecting rods are fixed above both of the two scraper strips. One end of each of the plurality of second connecting rods penetrates through the rectangular connecting frame and extends above the rectangular connecting frame. First springs are sleeved outside the plurality of first connecting rods and the plurality of second connecting rods.

[0007] Preferably, the automatic positioning component further includes a plurality of knocking components. The plurality of knocking components are respectively arranged on both sides of the rectangular connecting frame. The knocking components are used to knock both sides of the crack repair to help the repair agent quickly penetrate deep into the crack.

[0008] Preferably, the knocking component includes an L-shaped mounting plate fixed to one end of the first connecting rod. A self-rolling disk rotates on one side of the L-shaped mounting plate. A jacking column is fixed to one side of the self-rolling disk. A guide groove is formed on one side of the L-shaped mounting plate. A stress plate slides in the guide groove through a sliding rod. A second spring is fixed above the stress plate. A knocking block is fixed below the stress plate.

[0009] Preferably, two fixing frames are fixed below the mobile frame. Electric push rods are fixed above both of the two fixing frames. A plurality of sliding columns slide inside both of the two fixing frames. A support frame is fixed between one ends of the plurality of sliding columns. The rectangular connecting frame is fixed to the inner side of the support frame through a connecting column.

[0010] Preferably, a cleaning roller rotates between both ends of the support frame. Limit columns are fixed to both ends of the support frame. One end of each of the two limit columns extends above the mobile frame.

[0011] Preferably, two inverted U-shaped columns are fixed below the mobile frame. Two opposite traction grooves are formed inside both of the two inverted U-shaped columns. T-shaped mounting plates slide inside both of the two inverted U-shaped columns. A flattening roller rotates between one ends of the two T-shaped mounting plates.

[0012] Preferably, a mixing tank is fixed above the mobile frame. A mixing and stirring rod rotates inside the mixing tank. A telescopic hose is fixed below the mixing tank. One end of the telescopic hose is fixed with a repair liquid outlet head, and the repair liquid outlet head is fixed at the center position inside the rectangular connection frame through a fixing plate.

[0013] Preferably, an impurity collection box is fixed above the mobile frame. A collection pipe is fixed outside the impurity collection box. One end of the collection pipe extends below the mobile frame, and a collection hopper is fixed at the end of the collection pipe extending below the mobile frame.

[0014] Preferably, a plurality of wheels are installed below the mobile frame.

[0015] Preferably, two anti-slip push-pull handle bars are fixed above the mobile frame.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: When the leveling block and the leveling strip encounter a downwardly curved road surface, they are pushed downward by the elastic force of the first spring, so that the leveling block and the leveling strip always remain in a state of being attached to the road surface. When encountering a section of road surface with an upward bulge, the leveling block and the leveling strip will receive an upward thrust at the bulging road surface, thereby pushing the first connecting rod and the second connecting rod upward, so that the leveling block or the leveling strip can smoothly move above the road surface along with the road surface bulge. The leveling block and the leveling strip will automatically fit on its surface according to the curvature of the road surface, avoiding the situation that the leveling block and the leveling strip cannot scrape the repair liquid in the curved and uneven road cracks, and improving the flexibility and applicability of the device.

[0017] When the leveling block moves, the self-rolling disc will roll on the road surface, so that the jacking column rotates repeatedly. When one end of the jacking column turns to the uppermost position, the force-receiving plate is pushed upward by its jacking, thereby lifting the knocking block from the road surface. When one end of the jacking column turns to a lower position, the force-receiving plate quickly drops and knocks on both sides of the crack on the road surface under the elastic force of the second spring and the self-weight of the knocking block, so that the repair liquid just injected into the crack better penetrates into the crack, increasing the contact area between the repair liquid and the road surface. It does not require external driving, can achieve automatic knocking along with the forward movement of the leveling block, saves the energy consumption caused by driving the knocking block by electricity, and can automatically adjust the position along with the leveling block, so that it can freely knock on the curved road surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the schematic diagram of the main structure of the present invention; Figure 2 is the bottom view of the present invention; Figure 3 is the partial cross-sectional view of the present invention; Figure 4Schematic diagram of the combination of the mobile frame and its bottom structure in the present invention; Figure 5 Partial exploded view of the self-aligning component in the present invention.

[0019] 1. Mobile frame; 2. Self-aligning component; 21. Rectangular connecting frame; 22. First connecting rod; 23. Scraping block; 24. Scraping strip; 25. Second connecting rod; 26. First spring; 27. Inverted L-shaped mounting plate; 28. Self-help rolling disc; 29. Lifting column; 210. Guide groove; 211. Stress plate; 212. Second spring; 213. Knocking block; 3. Fixed frame; 4. Electric push rod; 5. Sliding column; 6. Support frame; 7. Cleaning roller; 8. Limit column; 9. Inverted U-shaped column; 10. Tractive groove; 11. T-shaped mounting plate; 12. Flattening roller; 13. Mixing tank; 14. Mixing and stirring rod; 15. Telescopic hose; 16. Repair liquid outlet head; 17. Impurity collection box; 18. Collection pipe; 19. Collection hopper; 20. Wheel. Detailed implementation mode

[0020] The following further elaborates on the above-mentioned and other technical features and advantages of the present invention with reference to the accompanying drawings.

[0021] The present invention provides a technical solution: a raw material dissolving device for veterinary drug production, as Figure 1 shown, including a mobile frame 1 and a self-aligning component 2. A plurality of wheels 20 are installed below the mobile frame 1, and two anti-slip push-pull handlebars are fixed above the mobile frame 1. Among them, the wheels 20 close to the anti-slip push-pull handlebars can be set as electric wheels, which are driven by a motor to roll, saving the effort of personnel to push the equipment.

[0022] As Figures 1-5As shown in the figure, the self-aligning component 2 is arranged below the mobile frame 1. The self-aligning component 2 enables the repair component to always adhere to the uneven road surface. The self-aligning component 2 includes a leveling piece. The leveling piece includes a rectangular connection frame 21. Above the mobile frame 1, a mixing tank 13 is fixed. Inside the mixing tank 13, a heating cavity is arranged. Inside the heating cavity, a heating element is installed to heat the raw materials mixed inside the mixing tank 13, preventing the raw materials from precipitating or solidifying and affecting the discharge efficiency. Inside the mixing tank 13, a mixing and stirring rod 14 rotates. Above the mixing tank 13, a feed hopper and a servo motor are fixed. Mortar or asphalt raw materials are poured through the feed hopper. The mixing and stirring rod 14 is driven by the servo motor, and the mixing and stirring rod 14 fully mixes the internal raw materials. Below the mixing tank 13, a telescopic hose 15 is fixed. One end of the telescopic hose 15 is fixed with a repair liquid outlet head 16. The repair liquid outlet head 16 is fixed at the center position inside the rectangular connection frame 21 through a fixing plate. The telescopic hose 15 is connected between the repair liquid outlet head 16 and the mixing tank 13. When the repair liquid outlet head 16 moves up and down, due to its own softness and bendability, it is avoided that when the height of the repair liquid outlet head 16 changes, it will not affect its liquid outlet connection effect with the mixing tank 13. Inside the rectangular connection frame 21, a plurality of first connecting rods 22 slide. The plurality of first connecting rods 22 are equally divided into two groups in terms of quantity. The two groups are respectively located on two opposite sides of the rectangular connection frame 21. One end of each of the plurality of first connecting rods 22 is fixed with a leveling block 23. On both sides below the rectangular connection frame 21, leveling strips 24 are arranged. The leveling strips 24 and the leveling blocks 23 form a rectangular fence below the rectangular connection frame 21 to surround the repair liquid outlet head 16 on all sides. Above both of the two leveling strips 24, a plurality of second connecting rods 25 are fixed. One end of each of the plurality of second connecting rods 25 penetrates through the rectangular connection frame 21 and extends above the rectangular connection frame 21. A first spring 26 is sleeved outside each of the plurality of first connecting rods 22 and the plurality of second connecting rods 25. The first spring 26 is located below the rectangular connection frame 21 and is used to limit the positions of the leveling blocks 23 and the leveling strips 24.

[0023] As Figures 1-5As shown, the self-adjusting component 2 further includes a plurality of knocking members, which are respectively arranged on both sides of the rectangular connection frame 21. The knocking members are used to knock on both sides of the crack repair area to help the repair agent quickly penetrate deep into the crack. The knocking member includes an inverted L-shaped mounting plate 27 fixed to one end of the first connecting rod 22. A self-help rolling disc 28 is rotatably mounted on one side of the inverted L-shaped mounting plate 27. The lowest part of the self-help rolling disc 28 is at the same height as the lower part of the scraping block 23, and can be adjusted with the self-adjustment of the scraping block 23 so as to always keep in contact with the road surface and roll as the moving frame 1 moves on the road surface. A jacking column 29 is fixed to one side of the self-help rolling disc 28. The jacking column 29 rotates as the self-help rolling disc 28 rotates. A guiding groove 210 is formed on one side of the inverted L-shaped mounting plate 27. The guiding groove 210 is located above the self-help rolling disc 28. A force-bearing plate 211 is slidably mounted in the guiding groove 210 through a sliding rod. The force-bearing plate 211 is located directly above the jacking column 29. When one end of the jacking column 29 rotates upwards, the force-bearing plate 211 is jacked upwards. A second spring 212 is fixed above the force-bearing plate 211, and a knocking block 213 is fixed below the force-bearing plate 211. When the force-bearing plate 211 is jacked upwards, the knocking block 213 is driven to leave the road surface upwards, and when one end of the jacking column 29 rotates downwards, the knocking block 213 will fall and knock on both sides of the crack on the road surface. The knocking can generate a certain vibration to help the repair liquid better penetrate into the bottom and side of the crack, especially for the repair of deeper cracks or narrow spaces, the effect is remarkable.

[0024] As Figures 1-5As shown in the figure, two fixing frames 3 are fixed below the moving frame 1. Electric push rods 4 are fixed above both of the two fixing frames 3. Both of the two electric push rods 4 are connected to an external control switch through the prior art. A plurality of sliding columns 5 slide inside both of the two fixing frames 3. A support frame 6 is fixed between one ends of the plurality of sliding columns 5, and the support frame 6 is located below the fixing frame 3. The rectangular connection frame 21 is fixed to the inner side of the support frame 6 through a connection column. A cleaning roller 7 is rotatably arranged between two ends of the support frame 6. One end of the cleaning roller 7 is driven by a driving motor. The cleaning roller 7 rotates to first clean the impurity particles at the repair location, creating a better foundation for the filling of the repair liquid. Limit columns 8 are fixed at both ends of the support frame 6. One ends of both of the two limit columns 8 extend above the moving frame 1. The functions of the limit columns 8 and the sliding columns 5 are both for guiding and limiting. When the support frame 6 moves up and down, it is restricted to move vertically, and the support frame 6 can be prevented from detaching from the fixing frame 3 and the moving frame 1. An impurity collection box 17 is fixed above the moving frame 1. A sealing door is hinged on the impurity collection box 17. An observation window is arranged on the sealing door. Through the observation window, the impurity collection amount inside the impurity collection box 17 can be clearly seen. Through the sealing door, the impurities collected inside can be conveniently cleaned regularly. A collection pipe 18 is fixed to the outside of the impurity collection box 17. One end of the collection pipe 18 extends below the moving frame 1. The end of the collection pipe 18 extending below the moving frame 1 is fixed with a collection hopper 19. The collection hopper 19 uses an air extraction pump to suck the impurity particles swept out by the cleaning roller 7 on the road surface into the impurity collection box 17. Two inverted U-shaped columns 9 are fixed below the moving frame 1. Two opposite traction grooves 10 are formed inside both of the two inverted U-shaped columns 9. T-shaped mounting plates 11 slide inside both of the two inverted U-shaped columns 9. Two ends of both of the two T-shaped mounting plates 11 slide in the two traction grooves 10 inside both of the two inverted U-shaped columns 9 respectively. A flattening roller 12 is rotatably arranged between one ends of both of the two T-shaped mounting plates 11. The flattening roller 12 will change its position depending on the unevenness of the road surface by sliding of the T-shaped mounting plate 11 in the traction groove 10, avoiding being unable to contact the road surface at concave or convex road surfaces and flattening the repair position.

[0025] During use, raw materials such as mortar required for road patching are put into the mixing tank 13 through the feed hopper. The mixing and stirring rod 14 is driven by a servo motor, and the internal raw materials are fully mixed by the mixing and stirring rod 14. The moving vehicle frame 1 is pushed to the road crack to be patched by using the anti-slip push-pull rod, so that the crack is in the middle position of the device. The air pump, driving motor and electric push rod 4 in the device are started. The electric push rod 4 expands and contracts to push the support frame 6 downward. The support frame 6 vertically moves downward under the guidance of the sliding column 5 and the limit column 8. The support frame 6 drives the cleaning roller 7, the self-aligning component 2 and the patching liquid outlet head 16 connected thereto to move downward until the leveling block 23 and the cleaning roller 7 are both attached to the road surface. When the leveling block 23 is attached to the road surface, the liquid below the self-rolling disc 28 is also attached to the road surface. The driving motor is used to drive the cleaning roller 7 to rotate at a high speed, and the impurity particles and other substances at and around the crack are swept forward. At the same time, the air pump uses the collecting hopper 19 and the collecting pipe 18 to suck the swept impurity particles into the impurity collecting box 17.

[0026] Push the moving vehicle frame 1 to move the moving vehicle frame 1 forward along the crack. The patching liquid outlet head 16 fills the patching liquid into the crack. At the same time, the leveling block 23 and the leveling strip 24 move on the road surface as the moving vehicle frame 1 moves, and the patching liquid is leveled to prevent the patching liquid from forming a bulge on the road surface and affecting the road surface flatness. When the leveling block 23 moves, the self-rolling disc 28 will roll on the road surface, so that the jacking column 29 rotates repeatedly. When one end of the jacking column 29 rotates to the uppermost position, the force receiving plate 211 is pushed upward by it, so as to squeeze the second spring 212 and lift the knocking block 213 from the road surface. When one end of the jacking column 29 rotates to the lower side, the thrust given below the force receiving plate 211 disappears. Under the elastic force of the second spring 212 and the self-weight of the knocking block 213, the knocking block 213 quickly falls and knocks on both sides of the crack on the road surface, so that the patching liquid just injected into the crack can better penetrate into the crack, increase the contact area between the patching liquid and the road surface, thereby improving the adhesion and reducing the risk of subsequent peeling. Moreover, through the knocking of the knocking block 213, the compactness of the patching material can be promoted, its porosity and the voids in the crack can be reduced, its strength and durability can be enhanced. The knocking generates a certain vibration that can help the patching liquid better penetrate into the bottom and side of the crack, especially for the repair of deeper cracks or narrow spaces, ensuring that the patching liquid is evenly distributed in the crack. It does not require external force drive and can achieve automatic knocking as the leveling block 23 moves forward, saving the energy consumption caused by driving the knocking block 213 by electricity.

[0027] When the leveling block 23 and the leveling bar 24 move on the road surface to level the repair liquid, when encountering a situation where the road surface bends downward, under the pushing force of the first spring 26, the leveling block 23 and the leveling bar 24 will be pushed downward, and the first connecting rod 22 and the second connecting rod 25 will slide downward in the rectangular connecting frame 21, so that the leveling block 23 and the leveling bar 24 always maintain a state of being in contact with the road surface. When encountering a section of the road surface that bulges upward, the leveling block 23 and the leveling bar 24 will receive an upward pushing force at the bulging road surface, thereby pushing the first connecting rod 22 and the second connecting rod 25 upward and squeezing the first spring 26, so that the leveling block 23 or the leveling bar 24 moving onto the bulging road surface can be in contact with the road surface. When repairing cracks on an uneven road surface, the leveling block 23 and the leveling bar 24 will automatically conform to the surface according to the curvature of the road surface, avoiding the situation where the leveling block 23 and the leveling bar 24 cannot level the repair liquid in the curved and uneven road cracks, improving the flexibility and applicability of the device. Moreover, when the leveling block 23 automatically adjusts its height according to the curvature of the road surface, it will drive the inverted L-shaped mounting plate 27 and the self-rolling disc 28 connected to the first connecting rod 22 to automatically adjust their positions, so that the self-rolling disc 28 and the knocking block 213 can be in contact with the curved road surface, avoiding the situation where the knocking block 213 cannot knock on the road surface when encountering a downward-bending road surface, and the knocking block 213 cannot move onto the road surface to perform the knocking action when encountering an upward-bending road surface.

[0028] The above are only the preferred embodiments of the present invention, which are illustrative rather than restrictive to the present invention. Those skilled in the art understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, but all will fall within the protection scope of the present invention.

Claims

1. A pavement crack repair device for road maintenance, characterized in that Including: Mobile frame (1); Self-aligning component (2), the self-aligning component (2) is arranged below the mobile frame (1), the self-aligning component (2) makes the repair part always fit on the uneven road surface, the self-aligning component (2) includes a leveling piece, the leveling piece includes a rectangular connecting frame (21), a plurality of first connecting rods (22) slide inside the rectangular connecting frame (21), one ends of the plurality of first connecting rods (22) are all fixed with leveling blocks (23), leveling strips (24) are arranged on both sides below the rectangular connecting frame (21), a plurality of second connecting rods (25) are fixed above the two leveling strips (24), one ends of the plurality of second connecting rods (25) all penetrate through the rectangular connecting frame (21) and extend above the rectangular connecting frame (21), and first springs (26) are sleeved outside the plurality of first connecting rods (22) and the plurality of second connecting rods (25).

2. A pavement crack repair device for road maintenance according to claim 1, characterized in that, The self-aligning component (2) further includes a plurality of knocking components, the plurality of knocking components are respectively arranged on both sides of the rectangular connecting frame (21), and the knocking components are used to knock both sides of the crack repair to help the repair agent quickly penetrate deep into the crack.

3. The pavement crack repair device for road maintenance according to claim 2, characterized in that, The knocking component includes an L-shaped mounting plate (27) fixed to one end of the first connecting rod (22), a self-rolling disc (28) is rotated on one side of the L-shaped mounting plate (27), a jacking column (29) is fixed to one side of the self-rolling disc (28), a guiding groove (210) is opened on one side of the L-shaped mounting plate (27), a stress plate (211) slides inside the guiding groove (210) through a sliding rod, a second spring (212) is fixed above the stress plate (211), and a knocking block (213) is fixed below the stress plate (211).

4. A pavement crack repair device for road maintenance according to claim 3, characterized in that, Two fixing frames (3) are fixed below the mobile frame (1), electric push rods (4) are fixed above the two fixing frames (3), a plurality of sliding columns (5) slide inside the two fixing frames (3), a support frame (6) is fixed between one ends of the plurality of sliding columns (5), and the rectangular connecting frame (21) is fixed to the inner side of the support frame (6) through a connecting column.

5. The pavement crack repair device for road maintenance according to claim 4, characterized in that, A cleaning roller (7) is rotated between the two ends of the support frame (6), limiting columns (8) are fixed at both ends of the support frame (6), and one ends of the two limiting columns (8) all extend above the mobile frame (1).

6. A pavement crack repair device for road maintenance according to claim 1, characterized in that, Two inverted U-shaped columns (9) are fixed below the mobile frame (1), two opposite traction grooves (10) are opened on the inner sides of the two inverted U-shaped columns (9), T-shaped mounting plates (11) slide on the inner sides of the two inverted U-shaped columns (9), and a flattening roller (12) is rotated between one ends of the two T-shaped mounting plates (11).

7. A pavement crack repair device for road maintenance according to claim 1, characterized in that Above the mobile frame (1), a mixing tank (13) is fixed. Inside the mixing tank (13), a mixing and stirring rod (14) rotates. Below the mixing tank (13), a telescopic hose (15) is fixed. One end of the telescopic hose (15) is fixed with a repair liquid outlet head (16), and the repair liquid outlet head (16) is fixed at the center position inside the rectangular connection frame (21) through a fixing plate.

8. A pavement crack repair device for road maintenance according to claim 1, characterized in that, Above the mobile frame (1), an impurity collection box (17) is fixed. Outside the impurity collection box (17), a collection pipe (18) is fixed. One end of the collection pipe (18) extends below the mobile frame (1), and the end of the collection pipe (18) extending below the mobile frame (1) is fixed with a collection hopper (19).

9. A pavement crack repair device for road maintenance according to claim 1, characterized in that, Below the mobile frame (1), a plurality of wheels (20) are installed.

10. A pavement crack repair device for road maintenance according to claim 1, characterized in that, Above the mobile frame (1), two anti-slip push-pull handle bars are fixed.

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