CN112757127A

CN112757127A - A device for polishing U rib

Info

Publication number: CN112757127A
Application number: CN202011625602.8A
Authority: CN
Inventors: 高兴; 舒先庆; 陈积里; 石灿; 王成林; 姚艺强
Original assignee: Wuhan Lixin Automation Technology Co ltd
Current assignee: Wuhan Lixin Automation Technology Co ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-05-07
Anticipated expiration: 2040-12-31
Also published as: CN112757127B

Abstract

The invention discloses a device for polishing a U rib, which is used for polishing the fixedly placed U rib and comprises a driving device, a rack, a walking track, a first guide rail and a polishing part, wherein the driving device is used for driving the rack to move along the walking track; the walking tracks are arranged along the length direction of the U ribs; the frame is connected with the walking track in a matching way and walks along the walking track under the driving of the driving device; the first guide rail is fixedly arranged on the rack, and the length direction of the first guide rail and the length direction of the U rib to be polished are staggered; the polishing part is movably connected to the frame through a first guide rail and can move along the first guide rail; the polishing part comprises a polishing component and an angle adjusting component; the grinding assembly is used for grinding the edge part of the web plate of the U rib; the polishing assembly can change the polishing angle under the adjustment of the angle adjusting assembly so as to adjust the polishing end face of the polishing assembly to be adapted to the surface to be polished of the U-rib web. The device can automatically polish the inclined planes at the end parts of the web plates on the two sides of the U rib, and is high in efficiency and high in polishing precision.

Description

A device for polishing U rib

Technical Field

The invention relates to the technical field of welding of U ribs, in particular to a device for polishing the U ribs.

Background

The steel box girder is an important component in a bridge bearing structure and is mainly used for providing support and avoiding bridge deformation. The steel box girder is generally in an orthotropic plate structure and is formed by welding U ribs and a bottom plate.

The orthotropic plate structure has the advantages of light weight, large bearing capacity, short construction period and the like, and is widely applied to the construction of steel structure bridges. In the orthotropic steel structure bridge, in order to reduce welding defects of the U rib and the bridge deck plate connecting seam welding, the edge side of a web plate of the U rib needs to be polished and derusted before the fillet welding seam is welded. Because the web nonparallel of U rib both sides, and the web thickness differs, the U rib is polished at present and is mainly relied on the handheld electric tool of workman to polish, and not only inefficiency, precision are low in the manual work of polishing, and the regional dust of polishing is big moreover, and the operational environment is hard.

Disclosure of Invention

Aiming at the defects of the prior art, the invention discloses a device for polishing a U-shaped rib, which can automatically polish inclined planes at the end parts of web plates at two sides of the U-shaped rib, and has high efficiency and high polishing precision.

The invention is realized by the following technical scheme.

A device for polishing a U-shaped rib is used for polishing the fixedly placed U-shaped rib and comprises a driving device, a rack, a walking track, a first guide rail and a polishing part; the walking tracks are arranged along the length direction of the U ribs; the rack is connected with the walking track in a matching way and driven by the driving device to walk along the walking track; the first guide rail is fixedly arranged on the rack, and the length direction of the first guide rail and the length direction of the U rib to be polished are staggered; the grinding part is movably connected to the rack through the first guide rail and can move along the first guide rail; the polishing part comprises a polishing component and an angle adjusting component; the grinding assembly is used for grinding the web plate edge part of the U rib; the polishing assembly can change the polishing angle under the adjustment of the angle adjusting assembly so as to adjust the polishing end face of the polishing assembly to be adapted to the surface to be polished of the U-rib web.

On the basis of the technical scheme, the invention can be further improved as follows.

Furthermore, the polishing part also comprises a polishing seat and a transverse movement adjusting assembly, and the polishing assembly and the angle adjusting assembly are both arranged on the polishing seat; the polishing seat is matched and movably connected with the first guide rail; the transverse moving adjusting component is fixedly arranged on the rack and is connected with the polishing seat in a transmission way.

Further, the transverse moving adjusting assembly comprises a first lead screw, a first nut, a handle and a bearing seat; the first nut is fixedly arranged on the polishing seat; the bearing block is fixedly arranged on the frame; the first lead screw is connected with the first nut in a matched manner through the bearing seat; the handle is mounted at the end part of the first lead screw; and the handle is rotated to drive the grinding seat to move along the first guide rail.

Further, the grinding assembly comprises a grinding frame and two first grinding heads which are oppositely arranged; the polishing frame is rotatably connected to the polishing seat through a rotating shaft, and the axial direction of the rotating shaft is parallel to the length direction of the U rib; the two first grinding heads are arranged on the grinding frame, and the inner surface and the outer surface of a web plate on one side of the U rib can be simultaneously ground through the two first grinding heads; the angle adjusting component is arranged between the polishing seat and the polishing frame.

Furthermore, the grinding assembly also comprises a second guide rail and a telescopic mechanism; the second guide rail is fixedly arranged on the grinding frame; the first polishing head used for polishing the inner side of the U-rib web is a fixed head, the first polishing head used for polishing the outer side of the U-rib web is a movable head, a movable head seat is arranged on the lower side of the movable head, and the movable head seat is connected to the second guide rail in a sliding mode; one end of the telescopic mechanism is fixed on the polishing frame, the other end of the telescopic mechanism is fixed on the movable head seat, and the movable head seat can be driven to move along the second guide rail through the telescopic mechanism so as to adjust the distance between the movable head and the fixed head.

Further, the telescopic mechanism is a cylinder or an electric push rod.

Further, the first polishing head is one or a combination of two of a grinding wheel, a grinding belt wheel, a steel wire wheel and a thousand impeller.

Further, the two first polishing heads are independently driven by a pair of synchronous belt wheels and a first motor respectively, and are uniformly arranged above the synchronous belt wheels and the first motor.

Further, the first grinding head is one or a combination of a laser nozzle and a sand blasting head.

Further, the grinding assembly also comprises two second grinding heads; the two second polishing heads are oppositely arranged and arranged on the feeding side or the discharging side of the two first polishing heads; the first polishing head is one or the combination of two of a grinding wheel, a grinding belt wheel, a steel wire wheel and a thousand impellers, and the second polishing head is one or the combination of two of a laser nozzle and a sand blasting head.

Further, the grinding assembly also comprises two second grinding heads; the two second polishing heads are oppositely arranged and arranged on the feeding side or the discharging side of the two first polishing heads; the first polishing head is one or the combination of two of a laser nozzle and a sand blasting head, and the second polishing head is one or the combination of two of a grinding wheel, a grinding belt wheel, a steel wire wheel and a thousand impeller.

Furthermore, the polishing assembly further comprises a dust hood and a dust removal system, wherein the dust hood is arranged outside the first polishing head and is communicated with the dust removal system through a pipeline.

Further, the sanding assembly further comprises an access detection element; the in-out detection element is arranged on the polishing frame and used for detecting the U rib.

Further, the angle adjusting assembly comprises a second lead screw, a second nut and a second motor; the second lead screw is in transmission connection with the second motor, and both the second lead screw and the second motor are arranged on the polishing seat; the second nut is fixedly arranged on the polishing frame; the second lead screw is connected with the second nut in a matched mode.

Furthermore, the two grinding parts are arranged side by side and oppositely along the length direction of the U rib, and the two grinding parts are respectively used for grinding two webs of the U rib.

Furthermore, two the portion of polishing respectively through a set of first guide rail with same frame swing joint.

Furthermore, the frame also comprises two supports for erecting U ribs, and the two supports for the U ribs are respectively fixed on two sides of the frame.

The device for polishing the U rib can automatically polish the two webs of the U rib, and can adjust the polishing end face of the grinding wheel to be parallel to the to-be-polished area of the web of the U rib by adjusting the inclination angle of the polishing frame, so as to automatically polish the inclined planes of the web ends on the two sides of the U rib.

Drawings

FIG. 1 is a schematic perspective view of an embodiment of an apparatus for grinding U-shaped ribs according to the present invention;

FIG. 2 is a schematic perspective view of the embodiment shown in FIG. 1 with the lower portion of the frame hidden;

FIG. 3 is a schematic top view of the embodiment shown in FIG. 1;

wherein the part numbers in the figures are represented as:

200. the device for polishing the U-shaped rib comprises a device 201, a frame 202, a first guide rail 203, a polishing seat 204, a first lead screw 205, a handle 206, a bearing seat 207, a polishing frame 208, a first polishing head 2081, a fixed head 2082, a movable head 209, a rotating shaft 210, a second guide rail 211, a telescopic mechanism 212, a movable head seat 213, a synchronous pulley 214, a first motor 215, a second polishing head 216, a dust hood 217, an in-out detection element 218, a second lead screw 219, a second nut 220, a second motor 221, a guide wheel shaft 222, a rib 223, a driving device 224 and a walking track.

Detailed Description

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. The principles and features of the present invention are described below in conjunction with the drawings, it being noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The examples are given solely for the purpose of illustration and are not intended to limit the scope of the invention.

Referring to fig. 1 to 3, fig. 1 is a schematic perspective view illustrating an embodiment of a device for grinding a U rib according to the present invention; FIG. 2 is a schematic perspective view of the embodiment shown in FIG. 1 with the lower portion of the frame hidden; fig. 3 is a schematic top view of the embodiment shown in fig. 1.

In the embodiment of the invention, the device 200 for polishing the U-shaped rib comprises a driving device 223, a frame 201, a walking track 224, a first guide rail 202 and a polishing part; the running rails 224 are arranged along the length direction of the U ribs; the rack 201 is provided with a traveling wheel, the traveling wheel is connected with the traveling rail 224 in a matching manner, the traveling wheel travels along the traveling rail 224 under the driving of the driving device 223, the driving device 223 can directly drive the traveling wheel to travel on the traveling rail 224 for the driving motor, the driving motor can also drive a gear, a rack is laid on the traveling rail 224, and the rack is driven to travel along the traveling rail 224 by the gear and rack transmission manner.

The first guide rail 202 is a linear guide rail and is horizontally and fixedly mounted on the rack 201, and the length direction of the first guide rail 202 is perpendicular to the advancing direction of the U-shaped rib to be polished; the grinding part is movably connected to the frame 201 through the first guide rail 202, and the grinding part can move along the first guide rail 202; the polishing part comprises a polishing component and an angle adjusting component; the grinding assembly is used for grinding the web plate edge part of the U rib; the grinding assembly can change the grinding angle under the adjustment of the angle adjusting assembly so as to adapt to the U rib.

In the technical scheme of the device 200 for polishing the U-shaped rib, disclosed by the invention, as the U-shaped rib is longer and generally longer than 12 meters, two polishing modes are provided during polishing, namely, the polishing equipment is kept still, the U-shaped rib moves, the U-shaped rib is kept still (supports are arranged at two ends of the U-shaped rib, and the U-shaped rib is fixed above a traveling path of a polishing part), and the polishing equipment moves. In the embodiment disclosed by the invention, the second implementation mode is that the U rib is kept still, and the driving device 223 drives the rack 201, so that the U rib web plate polishing work can be carried out while the polishing equipment moves.

In the polishing process of the U-shaped rib, the transverse position of the polishing part and the polishing angle can be adjusted in order to adjust the polishing angle of the polishing part, so that the transverse position of the polishing part can be adjusted manually or automatically to be suitable for the web polishing position of the U-shaped rib, the polishing part can be moved to a position along the first rail, and the pitch angle of the polishing part can be adjusted by the angle adjusting assembly to adjust the polishing angle.

Specifically, the polishing part further comprises a polishing seat 203 and a traverse adjusting assembly, and the polishing assembly and the angle adjusting assembly are both arranged on the polishing seat 203; the grinding seat 203 is matched and movably connected with the first guide rail 202; the transverse moving adjusting component is fixedly arranged on the rack 201 and is connected with the grinding seat 203 in a transmission way.

The grinding seat 203 is used for carrying a grinding part of the grinding device on one hand, and is matched with the first guide rail 202 on the other hand to play a role in starting and stopping.

The transverse moving adjusting component can be realized manually or electrically. The invention discloses a specific implementation mode of a manual implementation mode, which is shown in fig. 1 and fig. 2. The traversing adjusting component comprises a first lead screw 204, a first nut, a handle 205 and a bearing seat 206; the first nut (not shown) is fixedly arranged on the grinding seat 203; the bearing seat 206 is fixedly arranged on the frame 201; the first lead screw 204 is connected with the first nut in a matching way through the bearing seat 206; the handle 205 is mounted at the end of the first lead screw 204; rotating the handle 205 drives the sanding block 203 along the first rail 202.

Because when the horizontal position adjustment of the part of polishing, the adjustment distance is not long, consequently adopts screw-nut's transmission form to set up the mode of manual regulation, firstly can utilize the characteristics of its auto-lock, secondly can conveniently control the adjustment position. Because first lead screw 204 passes through bearing frame 206 and installs on frame 201, and first nut installs on the seat 203 of polishing, so when adjusting, only need through twist grip 205, can carry out horizontal both directions free adjustment with seat 203 of polishing, it is convenient to adjust to it is efficient.

In a specific embodiment of the disclosed polishing apparatus, the polishing assembly comprises a polishing frame 207 and two oppositely arranged first polishing heads 208; the grinding frame 207 is rotatably connected to the grinding seat 203 through a rotating shaft 209, and the axial direction of the rotating shaft 209 is parallel to the running direction of the U rib; both the first sanding heads 208 are mounted on the sanding frame 207, and the inner and outer surfaces of one side web of the U-shaped rib can be sanded simultaneously by the two first sanding heads 208; the angle adjusting assembly is installed between the polishing base 203 and the polishing frame 207.

Through the setting of the grinding frame 207, the first grinding head 208 can be installed on the first grinding head, the grinding frame 207 is rotatably connected to the grinding seat 203 through the rotating shaft 209, and the angle adjusting assembly is reused, so that the first grinding head 208 can be driven to adjust the angle by adjusting the grinding frame 207. The first sanding heads 208 are disposed in two opposite directions and can simultaneously sand the inner and outer surfaces of one of the webs of the U-shaped rib to improve sanding efficiency.

In a preferred embodiment, the angle adjustment assembly includes a second lead screw 218, a second nut 219, and a second motor 220; the second lead screw 218 is in transmission connection with the second motor 220, and both are mounted on the grinding seat 203; the second nut 219 is fixedly mounted on the grinding frame 207; the second lead screw 218 is connected with the second nut 219 in a matching manner. The angle adjusting assembly realizes adjustment by adopting a mode of driving the screw nut in an electric mode, and is convenient for realizing automatic control.

The grinding assembly further comprises a second guide rail 201 and a telescopic mechanism 211; the second guide rail 210 is fixedly mounted on the grinding frame 207; at least one of the two first polishing heads 208 is a movable head, and a movable head seat is arranged at the lower side of the movable head and is connected with the second guide rail in a sliding manner; one end of the telescopic mechanism is fixed on the polishing frame 207, the other end of the telescopic mechanism is fixed on the movable head base, and the movable head base can be driven to move along the second guide rail 210 through the telescopic mechanism, so that the distance between the two first polishing heads is adjusted.

Preferably, the first polishing head 208 for polishing the inner side of the U-rib web is a fixed head 2081, the first polishing head 208 for polishing the outer side of the U-rib web is a movable head 2082, a movable head seat 212 is arranged on the lower side of the movable head 2082, and the movable head seat 212 is slidably connected to the second guide rail 210; one end of the telescopic mechanism 211 is fixed to the polishing frame 207, the other end of the telescopic mechanism 211 is fixed to the movable head base 212, and the movable head base 212 can be driven to move along the second guide rail 210 through the telescopic mechanism 211, so that the distance between the movable head 2082 and the fixed head 2081 can be adjusted. Because the thickness of U rib differs, has polished a U rib moreover, when changing another one, the horizontal position of U rib also can change, consequently, will guarantee to polish the head and all can contact the web surface of U rib when polishing at every turn, through above-mentioned structure, the position of the head of polishing of regulation that can be very convenient ensures that the position of polishing the head can adapt to the position of U rib all the time.

Preferably, the telescopic mechanism 211 is a cylinder or an electric push rod.

Specifically, the two first polishing heads 208 may be one of a grinding wheel, a grinding wheel, a wire wheel and a spline wheel, or one of the two first polishing heads 208 may be selected respectively.

Since the grinding wheel, the grinding wheel, the wire wheel and the spline wheel are all rotary grinding wheels, as a preferred embodiment, the two first grinding heads 208 can be independently driven by a pair of synchronous pulleys 213 and a first motor 214, and the two first grinding heads 208 are uniformly arranged above the synchronous pulleys 213 and the first motor 214. The vertical installation mode is adopted, the space between the polishing seat 203 and the polishing frame 207 can be utilized to install driving components such as a motor, and the U rib on the upper portion can not be interfered during polishing, so that the whole structure is compact and reasonable, and the occupied space is small.

The first sanding head 208 may be implemented in another way other than by a rotary sanding wheel, i.e., the first sanding head 208 may be implemented by one or a combination of a laser head and a sandblasting head.

To further achieve the sanding effect, the sanding assembly of the present invention may further include two second sanding heads 215; the two second sanding heads 215 are arranged oppositely and are provided on the feed side or the discharge side of the two first sanding heads 208; the first polishing head 208 is one or a combination of two of a grinding wheel, a grinding belt wheel, a steel wire wheel and a thousand impeller, and the second polishing head 215 is one or a combination of two of a laser nozzle and a sand blast head. The two polishing modes are adopted for combined polishing, so that the polishing precision of the U-rib web plate can be further improved.

In the above-mentioned combined polishing manner, the two first polishing heads 208 may also be one or a combination of two of a laser nozzle and a sandblasting head, and the two second polishing heads 215 may be one or a combination of two of a grinding wheel, a grinding belt wheel, a wire wheel and a flap wheel.

In order to avoid dust pollution during polishing, in a preferred embodiment, the polishing assembly further comprises a dust collecting hood 216 and a dust removing system, wherein the dust collecting hood 216 is arranged outside the first polishing head 208 and is communicated with the dust removing system through a pipeline.

In order to better realize intelligent and automatic grinding operation, the grinding assembly further comprises an in-out detection element 217; the in-and-out detection element 217 is disposed at the feeding side of the first polishing head 208 for detecting whether a U-rib enters, and the in-and-out detection element 217 may be disposed at the discharging side of the first polishing head 208. When the U-shaped rib to be polished is about to enter the first polishing head 208, the in-and-out detection element 217 positioned on the feeding side senses materials through the sensor and sends a signal to the control center, the control center controls the polishing device to start the first polishing head 208 to work, when the U-shaped rib is polished and leaves from the polishing device, the in-and-out detection element 217 positioned on the discharging side detects that the materials leave, sends a signal to the control center, and the control center controls the polishing device to stop running. Therefore, idle running can be avoided to the maximum extent, energy consumption is saved, and automatic operation can be realized to the maximum extent. It should be noted that the "entering" or "leaving" of the U-shaped rib is a relative movement state, and actually, the U-shaped rib is fixed by the fixing device, and the device 200 for polishing the U-shaped rib moves forward.

According to the device 200 for polishing the U-shaped rib, disclosed by the invention, in order to improve polishing efficiency, the two polishing parts can be arranged side by side and oppositely along the running direction of the U-shaped rib, and are respectively used for polishing two webs of the U-shaped rib, so that the webs on two sides of the U-shaped rib can be simultaneously polished. It will be appreciated that the adjustment mechanism required for one of the grinding sections is provided accordingly.

When polishing, the U rib is fixed on the fixing frame in a reversed buckling mode, and the device for polishing the U rib is arranged on the lower side of the U rib for polishing. In order to ensure that the U-shaped rib is kept stable and does not shake all the time in the grinding process, the device for grinding the U-shaped rib further comprises a plurality of guide wheel shafts 221, and the guide wheel shafts 221 are respectively arranged on two sides of the grinding part and used for guiding the U-shaped rib; two guide grooves or guide ribs 222 are arranged on the guide wheel shaft 221, and two webs of the U rib can be positioned through the guide grooves or the guide ribs 222, so that shaking is avoided, further the polishing precision is improved, and meanwhile, the polishing device mechanism can be prevented from being damaged due to impact caused by shaking of the U rib.

In summary, the device for polishing the U-rib disclosed by the invention can adjust the polishing end face of the polishing head to be parallel to the region to be polished of the web of the U-rib by adjusting the inclination angle of the polishing frame 207, so as to automatically polish the inclined faces of the web ends at two sides of the U-rib. Meanwhile, one of the two polishing heads is fixed, and the other polishing head is movable, so that the polishing distance between the two polishing heads can be adjusted by adjusting the movable head 2082, and the U-rib web thickness polishing device is suitable for polishing the thickness change of different U-rib webs. The whole structure is reasonable in design and compact in structure, automatic and intelligent work can be achieved, the production efficiency of the steel box girder is greatly improved, and meanwhile, the labor cost is saved.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A device for polishing a U rib is used for polishing the fixedly placed U rib and is characterized by comprising a driving device, a rack, a traveling track and a polishing part;

the walking tracks are arranged along the length direction of the U ribs;

the rack is connected with the walking track in a matching way and driven by the driving device to walk along the walking track;

the polishing part comprises a polishing component and an angle adjusting component;

the grinding assembly is used for grinding the web plate edge part of the U rib;

the polishing assembly can change the polishing angle under the adjustment of the angle adjusting assembly so as to adjust the polishing end face of the polishing assembly to be adapted to the surface to be polished of the U-rib web.

2. An apparatus for grinding a U-rib according to claim 1 wherein said grinding assembly includes a grinding carriage and two oppositely disposed first grinding heads;

the polishing frame is rotatably connected to the polishing seat through a rotating shaft, and the axial direction of the rotating shaft is parallel to the length direction of the U rib;

the two first grinding heads are arranged on the grinding frame, and the inner surface and the outer surface of a web plate on one side of the U rib can be simultaneously ground through the two first grinding heads;

the angle adjusting component is arranged between the polishing seat and the polishing frame.

3. An apparatus as claimed in claim 1, wherein the grinding section further comprises a grinding base, a first guide rail and a traverse adjustment assembly;

the first guide rail is fixedly arranged on the rack, and the length direction of the first guide rail and the length direction of the U rib to be polished are staggered;

the grinding part is movably connected to the rack through the first guide rail and can move along the first guide rail;

the polishing assembly and the angle adjusting assembly are both arranged on the polishing seat;

the polishing seat is matched and movably connected with the first guide rail;

the transverse moving adjusting component is fixedly arranged on the rack and is connected with the polishing seat in a transmission way.

4. An apparatus as claimed in claim 2, wherein the traverse adjustment assembly comprises a first lead screw, a first nut, a handle and a bearing block;

the first nut is fixedly arranged on the polishing seat;

the bearing block is fixedly arranged on the frame;

the first lead screw is connected with the first nut in a matched manner through the bearing seat;

the handle is mounted at the end part of the first lead screw;

and the handle is rotated to drive the grinding seat to move along the first guide rail.

5. An apparatus for sanding a U-rib as in claim 2, wherein the sanding assembly further includes a second rail and a telescoping mechanism;

the second guide rail is fixedly arranged on the grinding frame;

at least one of the two first polishing heads is a movable head, a movable head seat is arranged on the lower side of the movable head, and the movable head seat is connected to the second guide rail in a sliding manner;

one end of the telescopic mechanism is fixed on the polishing frame, the other end of the telescopic mechanism is fixed on the movable head seat, and the movable head seat can be driven to move along the second guide rail through the telescopic mechanism, so that the distance between the two first polishing heads is adjusted.

6. A device for grinding a U-shaped rib as claimed in claim 5, wherein the telescopic mechanism is a cylinder or an electric push rod.

7. An apparatus for grinding a U-rib according to claim 5, wherein said first grinding head is one or a combination of two of a grinding wheel, a grinding wheel, a wire wheel and a thousand impeller.

8. An apparatus for grinding a U-rib according to claim 7, wherein each of said two first grinding heads is independently driven by a pair of timing pulleys and a first motor, both of said two first grinding heads being disposed above said timing pulleys and said first motor.

9. An apparatus for grinding a U-rib according to claim 5, wherein said first grinding head is one or a combination of two of a laser nozzle and a blast head.

10. An apparatus for grinding a U-rib according to claim 5 wherein the grinding assembly further comprises two second grinding heads;

the two second polishing heads are oppositely arranged and arranged on the feeding side or the discharging side of the two first polishing heads;

the first polishing head is one or the combination of two of a grinding wheel, a grinding belt wheel, a steel wire wheel and a thousand impellers, and the second polishing head is one or the combination of two of a laser nozzle and a sand blasting head.

11. An apparatus for grinding a U-rib according to claim 5 wherein the grinding assembly further comprises two second grinding heads;

the first polishing head is one or the combination of two of a laser nozzle and a sand blasting head, and the second polishing head is one or the combination of two of a grinding wheel, a grinding belt wheel, a steel wire wheel and a thousand impeller.

12. A device for sanding a U-rib as defined in claim 4, wherein the sanding assembly further includes a dust cage and a dust extraction system, the dust cage being located outside the first sanding head and being in communication with the dust extraction system via a conduit.

13. An apparatus for sanding a U-rib as defined in claim 4, wherein the sanding assembly further includes an access detection element;

the in-out detection element is arranged on the polishing frame and used for detecting the U rib.

14. An apparatus for grinding a U-rib as claimed in claim 4, wherein said angle adjusting assembly comprises a second lead screw, a second nut and a second motor;

the second lead screw is in transmission connection with the second motor, and both the second lead screw and the second motor are arranged on the polishing seat;

the second nut is fixedly arranged on the polishing frame;

the second lead screw is connected with the second nut in a matched mode.

15. A device for grinding a U-shaped rib as claimed in any one of claims 1 to 3, wherein the grinding parts are two and are arranged side by side and oppositely along the length direction of the U-shaped rib, and the two grinding parts are respectively used for grinding two webs of the U-shaped rib.

16. An apparatus as claimed in claim 15, wherein both of the grinding sections are movably connected to the same frame by a set of the first guide rails.

17. A device for grinding a U-rib as claimed in claim 1, further comprising two supports for mounting the U-rib, the two U-rib supports being fixed to both sides of the frame, respectively.