CN217619602U - U rib inner weld grinding device - Google Patents

Abstract

The utility model discloses a U rib inner weld grinding device solves prior art and can't carry out the coping to the local bad position of orthotropic steel bridge panel U rib inner weld thereby and use the technical problem who brings the potential safety hazard for the later stage. The utility model discloses a can locate the adjustment mechanism on the dolly from the dolly of walking on the bridge panel to and locate the emery wheel that is used for carrying out the coping to the need coping position of the internal weld between U rib and the bridge panel on the adjustment mechanism. The utility model has the advantages of simple structure and scientific and reasonable design, convenient to use can effectively carry out accurate coping and inspection to the perpendicular opposite sex steel bridge deck plate U rib inner weld to can realize the coping to the inside narrow and small space welding seam of different specification U ribs and the visual inspection of welding seam.

Description

U rib inner weld grinding device

Technical Field

The utility model belongs to the technical field of steel member processing equipment, concretely relates to U rib inner weld grinding device.

Background

The orthotropic plate, i.e. orthotropic steel bridge deck, is a structure which is composed of stiffening ribs (longitudinal ribs and transverse ribs) vertical to each other in the longitudinal and transverse directions and a bridge deck cover plate and bears the load of a wheel together. This structure is anisotropic in construction due to the difference in stiffness in two directions perpendicular to each other.

The steel bridge deck serves as the upper flange of the main beam and directly bears the wheel load of the vehicle. The steel bridge deck is formed by welding three thin plate pieces, namely a deck plate, a longitudinal rib and a transverse rib, an arc-shaped notch is arranged at the cross position of a welding line, and the construction details are complex. The stresses that are generated by wheel loads on the components as the vehicle passes, as well as the localized stresses and deformations that are generated at the intersections of the components, are also very complex, so the problem of fatigue of steel decking is one of the design considerations. Since the flat steel box girder is adopted in the uk Severn bridge (suspension bridge) in 1966, a plurality of fatigue cracks appear on the steel bridge deck slab, the main generated parts are rib angle welding seams between longitudinal and transverse ribs and arc notches at the crossed positions of longitudinal and transverse ribs, butt welding seams of U-shaped rib steel liner plates and the like, wherein the steel bridge deck slab site joints between beam sections are the weakest fatigue-resistant parts.

Because the steel bridge deck slab cannot be replaced and the repair after cracks are generated is difficult, for 50 years, through a series of experimental researches and finite element analysis and practical experience summary, the design and welding of the construction details of the steel bridge deck slab are continuously improved, so that the probability of the cracks generated on the steel bridge deck slab is greatly reduced. For example, in the construction of a steel bridge deck slab construction site joint, the longitudinal rib welding butt joint and the high-strength bolt butt joint which are adopted in the past are adopted, the butt joint of the back panel is improved by adopting a ceramic liner single-side welding double-side forming process, and the U-shaped ribs are in butt joint and splicing by adopting the high-strength bolts. The improved construction details overcome the welding butt joint of the longitudinal U-shaped rib embedding sections of the joints in the construction site, thereby improving the fatigue performance and avoiding the adverse effect of the bolting and splicing of the panels on the bridge deck pavement layer. This construction detail finds application in japanese sea island bridges, mingshi strait bridges (suspension bridges) and multi-ro bridges (cable-stayed bridges) built in 1999.

In order to improve the fatigue resistance of the U rib welding seam of the orthotropic steel bridge deck slab, more and more U ribs of the bridge and the bridge deck slab are welded in a full penetration mode, namely an inner welding mode and an outer welding mode. For the inner side welding seam of the U rib, the local welding seam is not formed well due to equipment failure or network pressure fluctuation and other factors, and the U rib has narrow inner space or can not be processed generally due to the defect that the U rib is far away from the end head, so that potential safety hazards are brought to subsequent use.

Therefore, designing a U-rib inner weld grinding device to precisely grind and inspect the U-rib inner weld of the orthotropic steel bridge deck slab becomes a technical problem to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: the U-rib inner weld grinding device is provided to at least solve some technical problems.

In order to achieve the above object, the utility model adopts the following technical scheme:

the utility model provides a U rib inner weld grinding device, includes can be on the bridge panel from the dolly of walking, locates the adjustment mechanism on the dolly to and locate and be used for carrying out the emery wheel of coping to the position that needs of the inner weld between U rib and the bridge panel on the adjustment mechanism.

Furthermore, the adjusting mechanism comprises an angle adjusting mechanism and a length adjusting mechanism which are arranged on the trolley; the angle adjusting mechanism comprises a positive and negative rotation servo motor arranged on the trolley, a rotating shaft connected with a driving shaft of the positive and negative rotation servo motor, and a rotating sleeve sleeved on the rotating shaft, wherein a key for limiting is arranged between the rotating shaft and the rotating sleeve; the length adjusting mechanism is arranged on the rotating sleeve, and the grinding wheel is arranged on the length adjusting mechanism.

Further, the length adjusting mechanism comprises a sleeve arranged on the rotary sleeve, an electric screw rod arranged in the sleeve, a stop block which is positioned in the sleeve, is in a disc shape and is in threaded connection with the electric screw rod, a telescopic rod positioned in the sleeve, and a compression spring which is positioned in the sleeve, is sleeved on the electric screw rod and is fixedly connected with the stop block and the telescopic rod at two ends respectively; the grinding wheel is arranged on the telescopic rod.

Furthermore, the trolley is provided with a vertical jacking mechanism for jacking and sliding with the inner top wall of the U rib, a left jacking mechanism for jacking and sliding with the inner left wall of the U rib, and a right jacking mechanism for jacking and sliding with the inner right wall of the U rib.

Furthermore, the vertical pressing mechanism comprises a vertical pressing cylinder arranged on the trolley and a vertical pressing wheel arranged on the vertical pressing cylinder and used for pressing and sliding with the inner top wall of the U rib.

Furthermore, the left jacking mechanism comprises a lateral pressing cylinder a arranged on the trolley, and a lateral pressing wheel a arranged on the lateral pressing cylinder a and used for jacking and sliding with the left wall in the U rib.

Furthermore, the right jacking mechanism comprises a lateral pressing cylinder b arranged on the trolley and a lateral pressing wheel b arranged on the lateral pressing cylinder b and used for jacking and sliding with the right wall in the U-shaped rib.

Furthermore, a camera monitoring mechanism for monitoring grinding work of the grinding wheel through camera shooting is arranged on the trolley and comprises a monitoring support rotatably installed on the trolley, a sliding block slidably installed on the monitoring support, a universal joint arranged on the sliding block and a camera installed on the universal joint.

Furthermore, a dust suction mechanism is arranged on the trolley and comprises a dust collector arranged in the trolley and a dust collector guide pipe connected to the dust collector and extending out of the front of the trolley.

Furthermore, the trolley is provided with a dust blocking mechanism, and the dust blocking mechanism comprises a baffle bracket a and a baffle bracket b which are arranged on the trolley, and an inverted V-shaped baffle which is arranged on the baffle bracket a and the baffle bracket b and extends obliquely to the front of the trolley.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model has the advantages of simple structure and scientific and reasonable design, convenient to use can effectively carry out accurate coping and inspection to the U rib inner weld of different sex steel decking to can realize the coping to the inside narrow and small space welding seam of different specification U ribs and the visual inspection of welding seam.

The utility model discloses mainly including the dolly that can be from walking on the bridge panel to and locate the emery wheel that is used for carrying out the coping to the coping position on the dolly through adjustment mechanism, adjustment mechanism includes angle adjustment mechanism and length adjustment mechanism, angle adjustment mechanism includes positive and negative rotation servo motor, pivot and rotatory sleeve pass through the key spacing, positive and negative rotation servo motor drive shaft is connected with the pivot through the shaft coupling, positive and negative rotation servo motor operation then can drive rotatory sleeve and use the pivot to rotate as the axle center, thereby realize angle modulation. Length adjustment mechanism includes the sleeve, electronic lead screw, the dog, telescopic link and pressure spring, the emery wheel is installed on the telescopic link, and operate with the butt weld coping through motor drive, electronic lead screw operation drive dog is along electronic lead screw length direction operation, can drive the telescopic link through pressure spring and be concertina movement in the sleeve, thereby realize that the emery wheel of drive installation on the telescopic link stretches out or contracts, so, through angle adjustment mechanism and length adjustment mechanism's regulation, can realize the accurate regulation of emery wheel with the butt weld coping.

The utility model discloses be equipped with vertical top tight mechanism on the dolly, left side top tight mechanism and right side top tight mechanism, the three cooperatees the interior roof that can push up tight U rib, interior left side wall and interior right wall, vertical top tight mechanism includes vertical compressing cylinder and vertical pinch roller, left side top tight mechanism includes side direction compressing cylinder an and side direction pinch roller an, right side top tight mechanism includes side direction compressing cylinder b and side direction pinch roller b, vertical compressing cylinder, side direction compressing cylinder an and side direction compressing cylinder b operate and stretch out, can stretch out vertical pinch roller, the interior roof that top tight U rib is stretched out to side direction pinch roller an and side direction pinch roller b, interior left side wall and interior right wall, thereby realize that the dolly is firm in the U rib and move, can not influence the emery wheel butt weld coping because of reasons such as jolt.

The utility model discloses establish the monitoring of making a video recording mechanism on the dolly, the monitoring of making a video recording mechanism is including the control support, the slider, universal joint and camera, the dolly relatively of control support carries out angle modulation, the principle can be the same with rotatory sleeve angle modulation principle that generates heat, and can also adjust the shooting angle of camera at will through the universal joint, guarantee that welding seam coping inspection does not have the dead angle, enable the accurate emery wheel coping welding seam operating mode of aiming at of camera, the camera is connected with external liquid crystal display and conveys the picture that it was taken with real-time on liquid crystal display with the welding seam coping operating personnel inspection welding seam condition.

The utility model discloses establish dust absorption mechanism on the dolly, dust absorption mechanism includes dust catcher and dust catcher pipe, can effectively inhale the dust catcher with the dust of emery wheel coping welding seam through the dust catcher pipe in, when guaranteeing the inside clear of U rib, can also be favorable to the shooting control of camera in the monitoring mechanism of making a video recording.

The utility model discloses establish on the dolly and keep off dirt mechanism, keep off dirt mechanism and include baffle support an, baffle support b and the baffle 17 that falls the V-arrangement, the baffle 17 that falls the V-arrangement stretches into to dolly the place ahead from last down inclining to the baffle 17 that falls the V-arrangement is located dust catcher pipe top, so can effectively stop the dust absorption within range at the dust catcher pipe with the dust of emery wheel coping welding seam, can effectively improve dust absorption mechanism's dust collection efficiency and dust absorption effect. Guarantee the monitoring mechanism of making a video recording and can shoot the relatively clear picture and show on liquid crystal display, guarantee the validity of welding seam coping inspection.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a rear view of the present invention.

Fig. 3 is a side view of the present invention.

Fig. 4 is a partially enlarged view of the length adjusting mechanism of the present invention.

Wherein, the names corresponding to the reference numbers are:

the device comprises a lateral pressing wheel a1, a lateral pressing cylinder a2, a trolley 3, a baffle plate support a4, a vertical pressing wheel 5, a vertical pressing cylinder 6, a baffle plate support b7, a lateral pressing cylinder b8, a lateral pressing wheel b9, a monitoring support 10, a sliding block 11, a camera 12, a grinding wheel 13, a telescopic rod 14, a rotary sleeve 15, a dust collector guide pipe 16, an inverted V-shaped baffle 17, a check block 18, an electric screw rod 19, a pressing spring 20, a bridge panel 21, a bridge rib 22, an inner welding line 23, a rotating shaft 24 and a sleeve 25.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

As shown in figures 1-4, the utility model provides a pair of U rib inner weld grinding device, simple structure, design scientific and reasonable, convenient to use can effectively carry out accurate coping and inspection to the U rib inner weld of the steel decking of an opposite sex to can realize the coping to the inside narrow and small space welding seam of different specification U ribs and the visual inspection of welding seam. The utility model discloses a can locate the adjustment mechanism on the dolly 3 from dolly 3 of walking on bridge panel 21 to and locate the emery wheel 13 that is used for carrying out the coping to the needs coping position of the internal weld 23 between U rib 22 and the bridge panel 21 on the adjustment mechanism.

The adjusting mechanism of the utility model comprises an angle adjusting mechanism and a length adjusting mechanism which are arranged on the trolley 3; the angle adjusting mechanism comprises a positive and negative rotation servo motor arranged on the trolley 3, a rotating shaft 24 connected with a driving shaft of the positive and negative rotation servo motor, and a rotating sleeve 15 sleeved on the rotating shaft 24, wherein a key for limiting is arranged between the rotating shaft 24 and the rotating sleeve 15; the length adjustment mechanism is provided on the rotating sleeve 15, and the grinding wheel 13 is mounted on the length adjustment mechanism.

The length adjusting mechanism of the utility model comprises a sleeve 25 arranged on a rotary sleeve 15, an electric screw rod 19 arranged in the sleeve 25, a stop block 18 which is positioned in the sleeve 25, is connected with the electric screw rod 19 by screw threads and is in a disc shape, a telescopic rod 14 positioned in the sleeve 25, and a compression spring 20 which is positioned in the sleeve 25, is sleeved on the electric screw rod 19 and has two ends respectively fixedly connected with the stop block 18 and the telescopic rod 14; the grinding wheel 13 is mounted on a telescopic rod 14.

The utility model discloses mainly including the dolly that can be from walking on the bridge panel to and locate the emery wheel that is used for carrying out the coping to the coping position on the dolly through adjustment mechanism, adjustment mechanism includes angle adjustment mechanism and length adjustment mechanism, angle adjustment mechanism includes positive and negative rotation servo motor, pivot and rotatory sleeve pass through the key spacing, positive and negative rotation servo motor drive shaft is connected with the pivot through the shaft coupling, positive and negative rotation servo motor operation then can drive rotatory sleeve and use the pivot to rotate as the axle center, thereby realize angle modulation. Length adjustment mechanism includes the sleeve, electronic lead screw, the dog, telescopic link and pressure spring, the emery wheel is installed on the telescopic link, and operate with the butt weld coping through motor drive, electronic lead screw operation drive dog moves along electronic lead screw length direction, can drive the telescopic link through pressure spring and be concertina movement in the sleeve, thereby realize that the emery wheel of drive installation on the telescopic link stretches out or contracts, so, through angle adjustment mechanism and length adjustment mechanism's regulation, can realize the accurate regulation of emery wheel with the butt weld coping.

The utility model discloses be equipped with on dolly 3 and be used for with the tight vertical tight mechanism in top that slides in the roof top in the U rib 22 for with the tight left tight mechanism in top that slides in the left wall top in the U rib 22, and be used for with the tight right tight mechanism in top that slides in the right wall top in the U rib 22.

The utility model discloses vertical tight mechanism in top is including locating vertical compressing tightly cylinder 6 on the dolly 3 to locate vertical compressing tightly cylinder 6 on be used for with U rib 22 in the roof top vertical pinch roller 5 that slides.

The utility model discloses tight mechanism in left side top compresses tightly cylinder a2 including locating the side direction on the dolly 3 to locate on the side direction compress tightly cylinder a2 be used for with U rib 22 in the tight side direction pinch roller a1 that slides of left wall top.

The utility model discloses tight mechanism in right side top compresses tightly cylinder b8 including locating the side direction on dolly 3 to locate on the side direction compress tightly cylinder b8 be used for with the tight side direction pinch roller b9 that slides in the right wall top in the U rib 22.

The utility model discloses be equipped with the tight mechanism in vertical top on the dolly, the tight mechanism in left side top and the tight mechanism in right side top, the three cooperatees and can push up the interior roof of tight U rib, interior left side wall and interior right wall, the tight mechanism in vertical top includes vertical compressing cylinder and vertical pinch roller, the tight mechanism in left side top includes side direction compressing cylinder an and side direction pinch roller an, the tight mechanism in right side top includes side direction compressing cylinder b and side direction pinch roller b, vertical compressing cylinder, side direction compressing cylinder an and side direction compressing cylinder b operate and stretch out, can stretch out vertical pinch roller, the interior roof that top tight U rib is stretched out to side direction pinch roller an and side direction pinch roller b, interior left side wall and interior right wall, thereby realize that the dolly is firm in the U rib and move, can not influence the emery wheel butt weld coping because of jolting etc. reasons such as jolting.

The utility model discloses be equipped with the monitoring of making a video recording mechanism that is used for the coping work of the monitoring emery wheel 13 of making a video recording on dolly 3, the monitoring support 10 on dolly 3 is installed including rotating to the monitoring mechanism of making a video recording, and the universal joint on slider 11 is located to slider 11 to and install camera 12 on the universal joint to slider 11 is installed to slidable mounting on monitoring support 10.

The utility model discloses establish the monitoring of making a video recording mechanism on the dolly, the monitoring of making a video recording mechanism is including the control support, the slider, universal joint and camera, the dolly relatively of control support carries out angle modulation, the principle can be the same with rotatory sleeve angle modulation principle that generates heat, and can also adjust the shooting angle of camera at will through the universal joint, guarantee that welding seam coping inspection does not have the dead angle, enable the accurate emery wheel coping welding seam operating mode of aiming at of camera, the camera is connected with external liquid crystal display and conveys the picture that it was taken with real-time on liquid crystal display with the welding seam coping operating personnel inspection welding seam condition.

The utility model discloses be equipped with dust absorption mechanism on dolly 3, dust absorption mechanism is including locating the dust catcher in dolly 3 to and connect on the dust catcher and stretch out to the dust catcher pipe 16 in dolly 3 the place ahead.

The utility model discloses establish dust absorption mechanism on the dolly, dust absorption mechanism includes dust catcher and dust catcher pipe, can effectively inhale the dust catcher with the dust of emery wheel coping welding seam through the dust catcher pipe in, when guaranteeing the inside clear of U rib, can also be favorable to the shooting control of camera in the monitoring mechanism of making a video recording.

The utility model discloses be equipped with on the dolly 3 and keep off dirt mechanism, keep off dirt mechanism including locating baffle support a4 and baffle support b7 on the dolly 3 to and install on baffle support a4 and baffle support b7 and incline to extend the shape of falling V baffle 17 in dolly 3 the place ahead.

The utility model discloses establish on the dolly and keep off dirt mechanism, keep off dirt mechanism and include baffle support an, baffle support b and the baffle 17 that falls the V-arrangement, the baffle 17 that falls the V-arrangement stretches into to dolly the place ahead from last down inclining to the baffle 17 that falls the V-arrangement is located dust catcher pipe top, so can effectively stop the dust absorption within range at the dust catcher pipe with the dust of emery wheel coping welding seam, can effectively improve dust absorption mechanism's dust collection efficiency and dust absorption effect. Guarantee the monitoring mechanism that makes a video recording can shoot relatively clear picture and show on liquid crystal display, guarantee the validity of welding seam coping inspection.

The utility model discloses dolly 3 walks to the position that U rib internal weld needs to be polished, and the side direction compresses tightly cylinder a2, side direction and compresses tightly cylinder b8 and the vertical cylinder 6 simultaneous workings that compresses tightly, and it is tight with the tight wheel an 1 of side direction top, side direction top tight wheel b9 and vertical top tight wheel 5 ejecting and U rib inner wall top respectively, and dolly 3 can stabilize the walking when ensureing to polish the welding seam. The rotating sleeve 15 rotates by a preset angle around a rotating shaft arranged on the trolley under the drive of an internal servo motor, so that the grinding wheel 13 and a part of a welding seam to be ground are accurately positioned, and the electric screw rod 19 rotates under the drive of the motor to push the stop block 18 to move outwards. The stop block 18 is connected with the telescopic rod 14 through a pressing spring 20, the telescopic rod 14 is ejected out when the stop block 18 moves outwards, the grinding wheel 13 at the end of the telescopic rod is tightly pressed against the weld joint on the inner side of the U-shaped rib, and under the action of the pressing spring 20, the grinding wheel 13 and the weld joint on the inner side of the U-shaped rib always keep a certain pressing force. By the walking of the trolley 3, the parts with poor forming on the welding seam are polished, and the polishing effect can be checked through the camera 12. Dust generated in the grinding process falls in front of the trolley 3 in a centralized way under the action of the inverted V-shaped baffle 17 and is sucked away through the negative pressure of the dust collector guide pipe 16.

The utility model discloses when using, adjust rotatory sleeve 15 and control support 10 to the welding seam one side that needs the coping, will take universal joint slider 11 to adjust suitable position along control support 10 to adjust suitable angle so that the position of the work of emery wheel 13 is observed to the clarity through the universal joint on slider 11 with camera 12. The trolley 3 travels to the part of the inner welding seam needing to be polished along the inside of the U rib, the lateral pressing cylinder a2, the lateral pressing cylinder b8 and the vertical pressing cylinder 6 are started, and the lateral jacking wheel a1, the lateral jacking wheel b9 and the vertical jacking wheel 5 are jacked out and tightly jacked against the inner wall of the U rib; under the monitoring of the camera 12, the grinding wheel 13 is aligned with a part needing to be polished by driving the servo motor in the rotary sleeve 15 to rotate; and starting the electric screw rod 19, pushing the telescopic rod 14 out under the pushing of the stop block 18, and pressing the end grinding wheel 13 of the telescopic rod with the part to be ground of the welding seam. The grinding wheel 13 and the trolley 3 are started to grind the welding line, and meanwhile, a dust collector guide pipe 16 at the front end of the trolley 3 sucks out generated dust. The thinning effect is checked by the camera 12.

The utility model discloses above-mentioned used is from walking dolly, the side direction compresses tightly cylinder a, vertical compressing tightly the cylinder, the side direction compresses tightly cylinder b, the camera, electronic lead screw, positive and negative rotation servo motor, including a motor, an end cap, a controller, and a cover plate, the structure of electrical equipment such as liquid crystal display, the circuit, and control principle are current known technology, and all can directly purchase the use on market, consequently, compress tightly cylinder a about the side direction, vertical compressing tightly the cylinder, the side direction compresses tightly cylinder b, the camera, electronic lead screw, positive and negative rotation servo motor, including a motor, an end cap, a controller, and a cover plate, the structure of electrical equipment such as liquid crystal display, the circuit, and control principle are not repeated here.

The utility model has simple structure, can realize the grinding of narrow space welding seams in U ribs with different specifications and the appearance inspection of the welding seams; dust generated by grinding the welding line can be sucked out in time through a dust collector guide pipe at the front end of the trolley and the V-shaped baffle plate, so that the inside of the U rib is kept clean; the utility model discloses the camera can be equipped with normal close formula lens cap, only opens at the camera during operation, prevents that the dust from falling into the cover camera lens.

Finally, it should be noted that: the above embodiments are only preferred embodiments of the present invention to illustrate the technical solution of the present invention, but not to limit the same, and certainly not to limit the scope of the present invention; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention; that is, the technical problems solved by the present invention are still consistent with the present invention and should be included in the protection scope of the present invention, even though there is no substantial change or retouching made in the design concept and spirit of the main body of the present invention; in addition, will the technical scheme of the utility model direct or indirect application is in other relevant technical field, all including on the same reason the utility model discloses an in the patent protection scope.

Claims (10)

1. The U-rib inner weld grinding device is characterized by comprising a trolley (3) capable of automatically walking on a bridge panel (21), an adjusting mechanism arranged on the trolley (3), and a grinding wheel (13) arranged on the adjusting mechanism and used for grinding a part, needing to be ground, of an inner weld (23) between a U-rib (22) and the bridge panel (21).

2. The U-rib inner weld grinding device according to claim 1, wherein the adjusting mechanism comprises an angle adjusting mechanism and a length adjusting mechanism which are arranged on the trolley (3); the angle adjusting mechanism comprises a positive and negative rotation servo motor arranged on the trolley (3), a rotating shaft (24) connected with a driving shaft of the positive and negative rotation servo motor, and a rotating sleeve (15) sleeved on the rotating shaft (24), and a key for limiting is arranged between the rotating shaft (24) and the rotating sleeve (15); the length adjusting mechanism is arranged on the rotating sleeve (15), and the grinding wheel (13) is arranged on the length adjusting mechanism.

3. The U-rib inner weld grinding device according to claim 2, wherein the length adjusting mechanism comprises a sleeve (25) arranged on the rotating sleeve (15), an electric screw rod (19) arranged in the sleeve (25), a stopper (18) which is positioned in the sleeve (25) and is in a disc shape and is in threaded connection with the electric screw rod (19), a telescopic rod (14) positioned in the sleeve (25), and a compression spring (20) which is positioned in the sleeve (25) and is sleeved on the electric screw rod (19) and two ends of which are respectively fixedly connected with the stopper (18) and the telescopic rod (14); the grinding wheel (13) is arranged on the telescopic rod (14).

4. The grinding device for the inner weld of the U rib according to claim 1, wherein the trolley (3) is provided with a vertical tightening mechanism for tightening and sliding with the inner top wall of the U rib (22), a left tightening mechanism for tightening and sliding with the inner left wall of the U rib (22), and a right tightening mechanism for tightening and sliding with the inner right wall of the U rib (22).

5. The U-rib inner weld grinding device according to claim 4, wherein the vertical tightening mechanism comprises a vertical pressing cylinder (6) arranged on the trolley (3) and a vertical pressing wheel (5) arranged on the vertical pressing cylinder (6) and used for tightly pressing and sliding with the inner top wall of the U-rib (22).

6. The U-rib inner weld grinding device according to claim 4, wherein the left tightening mechanism comprises a lateral pressing cylinder a (2) arranged on the trolley (3), and a lateral pressing wheel a (1) arranged on the lateral pressing cylinder a (2) and used for tightly pressing and sliding with the left wall in the U-rib (22).

7. The grinding device for the inner weld of the U rib according to claim 4, wherein the right jacking mechanism comprises a lateral compaction cylinder b (8) arranged on the trolley (3) and a lateral compaction wheel b (9) arranged on the lateral compaction cylinder b (8) and used for jacking and sliding with the inner right wall of the U rib (22).

8. The grinding device for the U-rib inner weld joint according to claim 1, characterized in that a camera monitoring mechanism for monitoring grinding work of the grinding wheel (13) through camera shooting is arranged on the trolley (3), the camera monitoring mechanism comprises a monitoring support (10) rotatably arranged on the trolley (3), a sliding block (11) slidably arranged on the monitoring support (10), a universal joint arranged on the sliding block (11), and a camera (12) arranged on the universal joint.

9. The U-rib inner weld grinding device according to claim 1, wherein a dust suction mechanism is arranged on the trolley (3), and the dust suction mechanism comprises a dust collector arranged in the trolley (3) and a dust collector duct (16) connected to the dust collector and extending to the front of the trolley (3).

10. The U-rib inner weld grinding device according to claim 1, wherein a dust blocking mechanism is arranged on the trolley (3), and comprises a baffle bracket a (4) and a baffle bracket b (7) which are arranged on the trolley (3), and an inverted V-shaped baffle (17) which is arranged on the baffle bracket a (4) and the baffle bracket b (7) and extends obliquely to the front of the trolley (3).

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