CN214200050U - Hole diameter detection equipment for machining base for wind power - Google Patents

Abstract

The utility model discloses a base processing bore check out test set for wind-powered electricity generation, including work platform, height adjusting mechanism and conveying mechanism, work platform: its upper surface left end is equipped with the mounting bracket, and the roof middle part of mounting bracket is equipped with apart from the inductor, and work platform's upper surface left end is equipped with the recess, and work platform's upper surface right-hand member is equipped with support frame, height adjusting mechanism: set up in the inside of support frame, height adjusting mechanism's left surface is equipped with the spliced pole, and the left end of spliced pole is equipped with laser range sensor, conveying mechanism: set up in the inside of recess, conveying mechanism transversely corresponds and vertically corresponds with the distance-measuring sensor with laser rangefinder sensor, and this base for wind-powered electricity generation is aperture check out test set for processing reduces the error of testing result, avoids the outflow of defective products, guarantees holistic production quality, reduces the input of manpower resources, saves the time that detects, improves the efficiency that detects, is convenient for the collection to the product.

Description

Hole diameter detection equipment for machining base for wind power

Technical Field

The utility model relates to an aperture check out test set technical field specifically is an aperture check out test set is used in base processing for wind-powered electricity generation.

Background

The aperture detection is one of the main contents of the length metering technology, for the measurement of the diameter of the hole, there are measurement methods such as direct measurement, indirect measurement and comprehensive measurement, the direct measurement is a method for directly measuring the aperture by using two-point or three-point positioning, and the most common aperture measurement method can adopt general length measuring tools capable of measuring the aperture, such as vernier calipers, tool microscopes, universal comparator, horizontal length measuring instrument, horizontal optical meter and pneumatic measuring instrument, according to the precision grade size and quantity of the measured aperture; the method can also adopt special aperture measuring tools, such as an inner diameter micrometer, an inner diameter dial indicator, an inner diameter micrometer, an electronic plug gauge, an aperture measuring instrument utilizing the principles of pneumatic optics electricity and the like, wherein indirect measurement is to measure a function related to the aperture and then convert the aperture size, comprehensive measurement is mainly to utilize a smooth plug gauge to check whether a workpiece is qualified or not by a universal method, in modern construction, the aperture detection is applied in a very large number of places, for example, in the machining process of a base for wind power, the aperture of the workpiece or a pipeline needs to be detected frequently to ensure the machining quality of the workpiece or the pipeline, but the existing commonly used detection equipment needs to be added manually in the working process, a large amount of time is wasted in the large-batch workpiece detection, and the detection efficiency is influenced.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome current defect, provide a base processing is with aperture check out test set for wind-powered electricity generation, make the process automation more of whole detection, reduce human resources's input, improve the efficiency that detects, can effectively solve the problem in the background art.

In order to achieve the above object, the utility model provides a following technical scheme: a hole diameter detection device for machining a base for wind power comprises a working platform, a height adjusting mechanism and a conveying mechanism;

a working platform: the left end of the upper surface of the mounting rack is provided with a mounting rack, the middle part of the top wall of the mounting rack is provided with a distance sensor, the left end of the upper surface of the working platform is provided with a groove, and the right end of the upper surface of the working platform is provided with a support frame;

height adjustment mechanism: the laser ranging device is arranged in the support frame, the left side surface of the height adjusting mechanism is provided with a connecting column, and the left end of the connecting column is provided with a laser ranging sensor;

the conveying mechanism comprises: the conveying mechanism is arranged in the groove, transversely corresponds to the laser ranging sensor and vertically corresponds to the distance sensor, and a photoelectric ranging sensor is arranged in a mounting groove in the middle of the upper surface of the conveying mechanism;

wherein: still include the PLC controller, the PLC controller sets up in work platform's front surface right-hand member, the input electricity of PLC controller is connected in external power supply, laser ranging sensor, the output of photoelectric ranging sensor and distance inductor all connects in the input of PLC controller, the convenience is to the detection in pipeline aperture, reduce the error of testing result, improve the accuracy of detecting, avoid the outflow of defective products, guarantee holistic production quality, the labour has been liberated simultaneously, workman's operating pressure has been alleviateed, make the process automation more of whole detection, reduce the input of manpower resources, the time of saving the detection, the efficiency of improvement detection, simultaneously can classify defective products and certified products, be convenient for to the collection of product.

Further, the height adjusting mechanism comprises a motor, a rotary column, a steel wire rope, a sliding block, a supporting block and a sliding groove, the motor is respectively arranged at the upper end and the lower end of the rear side surface of the supporting frame, an output shaft of the motor respectively penetrates through a vertically corresponding shaft hole on the supporting frame and is provided with the rotary column, the front end of the rotary column is respectively and rotatably connected with the inner wall of the front side of a sliding hole longitudinally corresponding to the upper end and the lower end of the supporting frame through a bearing, the supporting block is slidably connected inside the supporting frame, the left side surface of the supporting block is provided with the connecting column, the sliding groove is respectively arranged on the front inner wall and the rear inner wall of the supporting frame, the sliding groove is respectively and slidably connected with the sliding block vertically corresponding to the front end and the rear end of the supporting block, the upper end and the lower end of the sliding block are respectively and fixedly connected with the front end and the rear end of the rotary column transversely corresponding through the steel wire rope, the input end of the motor is electrically connected with the output end of the PLC controller to adjust the detected height, the detection is convenient.

Further, conveying mechanism includes rack plate, gear, rotating electrical machines, T type groove, T type fixture block and slide, the rack plate sets up both ends about the recess diapire, T type groove sets up in the diapire middle part of recess, the inside sliding connection in T type groove has T type fixture block, the upper end of T type fixture block is equipped with the slide, the lower surface of slide and the diapire sliding connection of recess, be equipped with photoelectric distance measuring sensor in the mounting groove at the upper surface middle part of slide, all be equipped with the rotating electrical machines in the mounting hole at both ends around the slide, the output shaft end of rotating electrical machines all is equipped with the gear, the gear is connected with the rack plate meshing that transversely corresponds respectively, the equal electricity of input of rotating electrical machines is connected in the output of PLC controller, shift the position of pipeline, conveniently detect.

Further, conveying mechanism is still including placing piece, electric putter and lift groove, the lift groove symmetry sets up in the upper surface middle part of slide, the bottom in lift groove all is equipped with electric putter, electric putter's flexible end top all is equipped with places the piece, place the piece respectively with the inside sliding connection of lift inslot of vertical correspondence, two middle parts of placing the piece transversely correspond with laser range sensor and with the vertical correspondence of distance inductor, electric putter's input all electricity is connected in the output of PLC controller, make the rigidity of pipeline, classify the pipeline according to the testing result simultaneously.

Furthermore, the front end and the rear end of the middle part of the upper surface of the working platform are symmetrically provided with inclined grooves, the middle parts of the front surface and the rear surface of the working platform are respectively provided with a slope, and the inclined surfaces of the slopes and the inclined groove inclined surfaces of the same side are located in the same plane, so that the pipeline can be conveniently rolled to the next procedure.

Compared with the prior art, the beneficial effects of the utility model are that: this base for wind-powered electricity generation is aperture check out test set for processing has following benefit:

1. when the pipe fitting moves to the position under the distance sensor 5, because the height of the sliding plate 99 is fixed, the height and the position of the pipe fitting can be obtained under the common detection of the photoelectric distance measuring sensor 13 and the distance sensor 5, then the detected data is transmitted to the PLC controller 10, the PLC controller 10 calculates the position of the circle center of the round hole to be detected, the motor is started, the output shaft of the motor drives the rotary column to rotate, the steel wire rope starts to wind on the rotary column, the supporting block and the sliding block slide to different positions according to the different winding lengths of the two steel wire ropes on the upper side and the two steel wire ropes on the lower side, the circle centers of the laser distance measuring sensor and the round hole to be detected are positioned on the same axis according to the data measured before, the pipeline continues to move rightwards, the laser distance measuring sensor enters the inside of the round hole to be detected, and then the laser distance measuring sensor is started, the radius of being surveyed the round hole is measured through the reflection of light to laser range finding sensor, then transmits for the PLC controller, reachs the aperture of being surveyed the round hole, can calculate the wall thickness of pipe fitting simultaneously, and the convenience is to the detection in pipeline aperture, reduces the error of testing result, and the accuracy that the body height detected avoids the outflow of defective products, guarantees holistic production quality, has liberated the labour simultaneously, has alleviateed workman's operating pressure.

2. The rotary motor is started through the regulation and control of the PLC controller, the output shaft of the rotary motor drives the gear to rotate, the gear is meshed with the rack plate to be connected, the sliding plate moves rightwards, the lower surface of the sliding plate is always attached to the bottom wall of the groove under the combined action of the T-shaped groove and the T-shaped clamping block, after the measurement is completed, the pipe fitting is moved to the middle of the working platform, the PLC controller judges whether the aperture of the round hole to be measured is qualified or not according to the measurement result, then the electric push rod is started, the telescopic end of the electric push rod pushes the placing block to move upwards and downwards, the placing block at one end is lifted, the placing block at one end is lowered, the pipe fitting is pushed to the inner part of the inclined groove corresponding to the longitudinal direction and then rolls to the collecting part through the slope, the whole detection process is more automated, the investment of human resources is reduced, the detection time is saved, the detection efficiency is improved, and meanwhile, defective products and qualified products can be classified, the collection of the product is convenient.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of the height adjusting mechanism of the present invention;

fig. 3 is a schematic structural diagram of the conveying mechanism of the present invention.

In the figure: 1 work platform, 2 recesses, 3 support frames, 4 mounting brackets, 5 distance sensors, 6 height adjusting mechanism, 61 motor, 62 commentaries on classics post, 63 wire rope, 64 sliders, 65 supporting blocks, 66 spout, 7 spliced pole, 8 laser ranging sensor, 9 conveying mechanism, 91 rack board, 92 gears, 93 rotating electrical machines, 94 place the piece, 95 electric putter, 96T type groove, 97T type fixture block, 98 lift groove, 99 slide, 10PLC controller, 11 oblique type groove, 12 slopes, 13 photoelectric ranging sensor.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-3, the present invention provides a technical solution: a hole diameter detection device for machining a base for wind power comprises a working platform 1, a height adjusting mechanism 6 and a conveying mechanism 9;

the working platform 1: the left end of the upper surface of the working platform is provided with a mounting frame 4, the middle part of the top wall of the mounting frame 4 is provided with a distance sensor 5, the left end of the upper surface of the working platform 1 is provided with a groove 2, so that the pipe fitting can be conveniently moved, and the right end of the upper surface of the working platform 1 is provided with a support frame 3 for providing a position for mounting a height adjusting mechanism 6;

height adjustment mechanism 6: the height adjusting mechanism 6 comprises a motor 61, a rotary column 62, a steel wire rope 63, a sliding block 64, a supporting block 65 and a sliding groove 66, the motor 61 is respectively arranged at the upper end and the lower end of the rear side surface of the supporting frame 3, an output shaft of the motor 61 respectively penetrates through a vertically corresponding shaft hole on the supporting frame 3 and is provided with the rotary column 62, the front end of the rotary column 62 is respectively and rotatably connected with the inner wall of the front side of a sliding hole longitudinally corresponding to the upper end and the lower end of the supporting frame 3 through a bearing, the supporting block 65 is slidably connected inside the supporting frame 3, the left side surface of the supporting block 65 is provided with the connecting column 7, the sliding groove 66 is respectively arranged on the front inner wall and the rear inner wall of the supporting frame 3, the sliding groove 66 is respectively communicated with the sliding holes at the upper end and the lower end of the supporting frame 3, and the sliding groove 66 is respectively and slidably connected with the sliding block 64 vertically corresponding to the front end and the rear end of the supporting block 65, the upper end and the lower end of a sliding block 64 are fixedly connected with the front end and the rear end of a rotary column 62 which transversely correspond to each other through a steel wire rope 63, the input end of a motor 61 is electrically connected with the output end of a PLC 10, the motor 61 is started through the regulation and control of the PLC 10, the rotary column 62 is driven to rotate by the output shaft of the motor 61, the steel wire rope 63 starts to wind on the rotary column 62, a supporting block 65 and the sliding block 64 slide to different positions through the difference of the winding lengths of two steel wire ropes 63 at the upper side and two steel wire ropes 63 at the lower side, the circle centers of a laser ranging sensor 8 and a round hole to be measured are positioned on the same axis according to the measured data, the pipe fitting continues moving rightwards, the laser ranging sensor 8 enters the round hole to be measured, then the laser ranging sensor 8 is started, the radius of the round hole to be measured is measured through the reflection of light rays by the laser ranging sensor 8, and then the radius of the round hole to be measured is transmitted to the PLC 10, the aperture of the round hole to be measured is obtained, and the wall thickness of the pipe fitting can be calculated;

the conveying mechanism 9: the device is arranged inside a groove 2, a conveying mechanism 9 transversely corresponds to a laser ranging sensor 8 and vertically corresponds to a distance sensor 5, photoelectric ranging sensors 13 are arranged in an installation groove in the middle of the upper surface of the conveying mechanism 9, the conveying mechanism 9 comprises rack plates 91, gears 92, a rotating motor 93, T-shaped grooves 96, T-shaped clamping blocks 97 and sliding plates 99, the rack plates 91 are arranged at the left end and the right end of the bottom wall of the groove 2, the T-shaped grooves 96 are arranged in the middle of the bottom wall of the groove 2, the T-shaped clamping blocks 97 are slidably connected inside the T-shaped grooves 96, the sliding plates 99 are arranged at the upper ends of the T-shaped clamping blocks 97, the lower surfaces of the sliding plates 99 are slidably connected with the bottom wall of the groove 2, the photoelectric ranging sensors 13 are arranged in the installation groove in the middle of the upper surface of the sliding plates 99, the rotating motors 93 are arranged in installation holes in the front end and the rear end of the sliding plates 99, gears 92 are arranged at the tail ends of output shafts of the rotating motors 93, and the gears 92 are respectively engaged with the transversely corresponding rack plates 91, the input end of the rotating motor 93 is electrically connected to the output end of the PLC 10, the conveying mechanism 9 further comprises placing blocks 94, electric push rods 95 and lifting grooves 98, the lifting grooves 98 are symmetrically arranged in the middle of the upper surface of the sliding plate 99, the electric push rods 95 are arranged at the bottoms of the lifting grooves 98, the placing blocks 94 are arranged at the tops of the telescopic ends of the electric push rods 95, the placing blocks 94 are respectively connected with the inner parts of the lifting grooves 98 which vertically correspond to each other in a sliding manner, the middle parts of the two placing blocks 94 transversely correspond to the laser distance measuring sensors 8 and vertically correspond to the distance sensors 5, the input end of the electric push rod 95 is electrically connected to the output end of the PLC 10, inclined grooves 11 are symmetrically arranged at the front and rear ends of the middle part of the upper surface of the working platform 1, slopes 12 are arranged in the middle parts of the front and rear surfaces of the working platform 1, the slopes of the slopes 12 are respectively located in the same plane with the slopes of the inclined grooves 11 on the same side, and the slopes are regulated and controlled by the PLC 10, starting a rotating motor 93, driving a gear 92 to rotate by an output shaft of the rotating motor 93, enabling a sliding plate 99 to move rightwards through the meshed connection of the gear 92 and a rack plate 91, enabling the lower surface of the sliding plate 99 to be always attached to the bottom wall of a groove 2 under the combined action of a T-shaped groove 96 and a T-shaped fixture block 97, when a pipe fitting moves to a position under a distance sensor 5, because the height of the sliding plate 99 is fixed, the height and the position of the pipe fitting can be obtained under the combined detection of a photoelectric distance measuring sensor 13 and the distance sensor 5, after the measurement is completed, the pipe fitting is moved to the middle part of a working platform 1, a PLC (programmable logic controller) 10 judges whether the aperture of the measured round hole is qualified according to the measurement result, then starting an electric push rod 95, the telescopic end of the electric push rod 95 pushes a placing block 94 to move upwards and downwards, the placing block 94 at one end is lifted, the placing block 94 at one end is lowered, and the pipe fitting is pushed to the inside of an inclined groove 11 which corresponds to the longitudinal direction, then rolled to a collection site by the ramp 12;

wherein: still include PLC controller 10, PLC controller 10 sets up in work platform 1's front surface right-hand member, and the input electricity of PLC controller 10 is connected in external power source, and laser ranging sensor 8, photoelectric ranging sensor 13 and distance sensor 5's output all connects in PLC controller 10's input, controls whole device's start-up and stop.

When in use: the whole device is fixed on a plane, a pipe to be detected is placed between two placing blocks 94, the outer arc surfaces of the pipe are respectively attached to the upper surfaces of the placing blocks 94, the position of the pipe is fixed under the combined action of the two placing blocks 94, the round hole to be detected transversely corresponds to a laser ranging sensor 8, a rotating motor 93 is started through the regulation and control of a PLC (programmable logic controller) 10, an output shaft of the rotating motor 93 drives a gear 92 to rotate, the sliding plate 99 is moved rightwards through the meshing connection of the gear 92 and a rack plate 91, meanwhile, the lower surface of the sliding plate 99 is always attached to the bottom wall of a groove 2 under the combined action of a T-shaped groove 96 and a T-shaped fixture block 97, when the pipe moves to a position under the common detection of a photoelectric ranging sensor 13 and a distance sensor 5, the height and the position of the pipe can be obtained due to the fixed height of the sliding plate 99, and then the detected data are transmitted to the PLC 10, the PLC 10 calculates the position of the center of a circle of a round hole to be measured, the PLC 10 controls the motor 61 to be started, the output shaft of the motor 61 drives the rotary column 62 to rotate, the steel wire rope 63 starts to wind on the rotary column 62, the supporting block 65 and the sliding block 64 slide to different positions according to the difference of the winding lengths of the two steel wire ropes 63 at the upper side and the two steel wire ropes 63 at the lower side, the laser ranging sensor 8 and the circle of the round hole to be measured are positioned on the same axis according to the previously measured data, the pipe continues to move rightwards, the laser ranging sensor 8 enters the round hole to be measured, then the laser ranging sensor 8 is started, the laser ranging sensor 8 measures the radius of the round hole to be measured through the reflection of light, then the radius of the round hole to be measured is transmitted to the PLC 10, the aperture of the round hole to be measured is obtained, the wall thickness of the pipe can be calculated, and the pipe is moved to the middle part of the working platform 1 after the measurement is completed, the PLC controller 10 judges whether the aperture of the round hole to be measured is qualified according to the measuring result, then starts the electric push rod 95, and the flexible end of the electric push rod 95 pushes the placing block 94 to move up and down, and the placing block 94 at one end rises, and the placing block 94 at one end descends, pushes the pipe fitting to the inside of the longitudinally corresponding inclined groove 11, and then slides to the collecting position through the slope 12.

It is to be noted that the PLC controller 10 disclosed in this embodiment may be an integrated PLC controller of NA200 model of the proud science and technology Jiangsu GmbH, south da, the laser distance measuring sensor 8, the distance sensor 5, the electric push rod 95, the motor 61 and the rotating motor 93 may be freely configured according to practical application scenarios, the laser distance measuring sensor 8, the photoelectric distance measuring sensor 13 and the distance sensor 5 may be reflective laser distance measuring sensors of T150HJG-CGQ model of the Taiwan science and technology GmbH, the electric push rod 95 may be an electric push rod of DT model of the Wuyang electric push rod machinery plant, Wu city, the electric push rod 61 and the rotating motor 93 may be speed regulating motors of 5IK40RGU-CF model of the Aohardd transmission equipment GmbH, Dongguan, the PLC controller 10 controls the laser distance measuring sensor 8, the photoelectric distance measuring sensor 13, the distance sensor 5Ik40RGu-CF, and the rotating motor 93, The electric push rod 95, the motor 61 and the rotary motor 93 are operated in a conventional manner in the art.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (5)

1. The utility model provides a base processing is with aperture check out test set for wind-powered electricity generation which characterized in that: comprises a working platform (1), a height adjusting mechanism (6) and a conveying mechanism (9);

working platform (1): the left end of the upper surface of the working platform is provided with a mounting rack (4), the middle of the top wall of the mounting rack (4) is provided with a distance sensor (5), the left end of the upper surface of the working platform (1) is provided with a groove (2), and the right end of the upper surface of the working platform (1) is provided with a support frame (3);

height adjustment mechanism (6): the height adjusting mechanism is arranged in the support frame (3), the left side surface of the height adjusting mechanism (6) is provided with a connecting column (7), and the left end of the connecting column (7) is provided with a laser ranging sensor (8);

conveying mechanism (9): the conveying mechanism (9) is arranged in the groove (2), transversely corresponds to the laser ranging sensor (8) and vertically corresponds to the distance sensor (5), and a photoelectric ranging sensor (13) is arranged in a mounting groove in the middle of the upper surface of the conveying mechanism (9);

wherein: still include PLC controller (10), PLC controller (10) set up in the front surface right-hand member of work platform (1), and the input electricity of PLC controller (10) is connected in external power source, and the output of laser rangefinder sensor (8), photoelectric ranging sensor (13) and distance sensor (5) all connects in the input of PLC controller (10).

2. The hole diameter detection equipment for machining the base for the wind power as claimed in claim 1, wherein: the height adjusting mechanism (6) comprises a motor (61), a rotary column (62), a steel wire rope (63), a sliding block (64), a supporting block (65) and a sliding groove (66), wherein the motor (61) is respectively arranged at the upper end and the lower end of the rear side surface of the supporting frame (3), an output shaft of the motor (61) respectively penetrates through a vertically corresponding shaft hole on the supporting frame (3) and is provided with the rotary column (62), the front end of the rotary column (62) is respectively and rotatably connected with the inner wall of the front side of a sliding hole longitudinally corresponding to the upper end and the lower end of the supporting frame (3) through a bearing, the supporting block (65) is slidably connected with the inside of the supporting frame (3), the left side surface of the supporting block (65) is provided with a connecting column (7), the sliding grooves (66) are respectively arranged on the front inner wall and the rear inner wall of the supporting frame (3), the sliding grooves (66) are respectively communicated with the sliding holes, the upper and lower both ends of slider (64) all pass through wire rope (63) and transversely correspond rotary column (62) front and back both ends fixed connection, and the input of motor (61) all connects in the output of PLC controller (10).

3. The hole diameter detection equipment for machining the base for the wind power as claimed in claim 1, wherein: the conveying mechanism (9) comprises rack plates (91), gears (92), a rotating motor (93), T-shaped grooves (96), T-shaped clamping blocks (97) and sliding plates (99), the rack plates (91) are arranged at the left end and the right end of the bottom wall of the groove (2), the T-shaped grooves (96) are arranged in the middle of the bottom wall of the groove (2), the T-shaped clamping blocks (97) are connected in the T-shaped grooves (96) in a sliding mode, sliding plates (99) are arranged at the upper ends of the T-shaped clamping blocks (97), the lower surfaces of the sliding plates (99) are connected with the bottom wall of the groove (2) in a sliding mode, photoelectric distance measuring sensors (13) are arranged in mounting grooves in the middle of the upper surfaces of the sliding plates (99), the rotating motor (93) are arranged in mounting holes in the front end and the rear end of the sliding plates (99), the gears (92) are arranged at the tail ends of output shafts of the rotating motors (93), and are respectively meshed with the rack plates (91) which correspond transversely, the input end of the rotating motor (93) is electrically connected with the output end of the PLC (10).

4. The hole diameter detection equipment for machining the base for the wind power as claimed in claim 3, wherein: conveying mechanism (9) are still including placing piece (94), electric putter (95) and lift groove (98), lift groove (98) symmetry sets up in the upper surface middle part of slide (99), and the bottom of lift groove (98) all is equipped with electric putter (95), and the flexible end top of electric putter (95) all is equipped with places piece (94), places piece (94) respectively with the inside sliding connection of lift groove (98) of vertical correspondence, two middle parts of placing piece (94) transversely correspond with laser range sensor (8) and with the vertical correspondence of distance inductor (5), the input of electric putter (95) all electricity is connected in the output of PLC controller (10).

5. The hole diameter detection equipment for machining the base for the wind power as claimed in claim 1, wherein: the upper surface of work platform (1) middle part around both ends symmetry be equipped with oblique type groove (11), surface middle part all is equipped with slope (12) around work platform (1), the inclined plane of slope (12) respectively with oblique type groove (11) inclined plane with one side lie in the coplanar.

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