CN113267513B - Three-dimensional scanning device based on binocular stereoscopic vision and scanning method thereof - Google Patents

Abstract

The invention discloses a three-dimensional scanning device based on binocular stereoscopic vision and a scanning method thereof. According to the invention, the whole body is supported by the supporting seat, the die to be scanned is placed by the bearing component, the angle of the die can be adjusted, the scanning component is driven to move by the moving component, and the scanning component can rotate, so that the scanning range of the scanning component is wider, the scanning component can conveniently extend into the inner cavity of the die, the inside of the die is scanned, and the acquisition of the image of the inner cavity of the die is more convenient.

Description

Three-dimensional scanning device based on binocular stereoscopic vision and scanning method thereof

Technical Field

The invention relates to the technical field of remanufacturing of automobile molds, in particular to a position-adjustable rotary drum sail device based on ocean energy and a use method thereof.

Background

The automobile die is used as the most important technological equipment in automobile production, plays an important role in ensuring the machining and assembly precision of automobile parts, and has the characteristics of high yield and fast production rhythm in automobile manufacturing, so that the damage amount of the die in the machining process is large, serious pitting or cracking can occur on the surface of the die after a period of working, the manufacturing cost of the die is extremely high, and if the damaged stamping die is scrapped directly, the waste is extremely high.

The remanufacturing is a series of technical measures or general terms of engineering activities for repairing and reforming the waste equipment by taking the whole life cycle theory of the equipment as a guide and taking the performance improvement of the waste equipment as a target, taking high quality, high efficiency, energy conservation, material conservation and environmental protection as criteria and taking advanced technology and industrialized production as means, wherein in the remanufacturing engineering, the repair of defective parts is the most important research content, so that the automobile mould is remanufactured to reduce the cost.

The method is characterized in that the mold image is acquired, the follow-up analysis of the mold defect is concerned, binocular stereoscopic vision scanning is used as a common scanning mode, the corresponding point matching of the left image and the right image is carried out by utilizing a digital image correlation algorithm, the contour is restored by utilizing a triangular reconstruction method, and the method is widely applied to scanning.

The existing scanning generally drives the binocular camera to move through the three-dimensional moving table so as to scan the die, but for the die with the inner cavity, after the die stretches into the inner cavity of the die, the adjusting range is smaller, and the scanning of the inner cavity of the die is affected.

Disclosure of Invention

First, the technical problem to be solved

The invention can solve the difficult problem that the scanning of the inner cavity of the die is affected due to the smaller adjusting range of the existing scanning device after the scanning device stretches into the inner cavity of the die.

(II) technical scheme

In order to achieve the above purpose, the present invention adopts the following technical scheme:

in a first aspect, the invention provides a three-dimensional scanning device based on binocular stereo vision and a scanning method thereof, comprising a supporting seat, a bearing assembly, a moving assembly and a scanning assembly, wherein the bearing assembly is arranged on the upper part of the supporting seat, the moving assembly is arranged on the upper part of the supporting seat, and the scanning assembly is arranged at the output end of the moving assembly.

The bearing assembly comprises a first electric sliding table, a bearing plate, two supporting rollers, a swinging motor, an arc-shaped supporting plate, a bearing frame and a fixing piece, wherein the first electric sliding table is installed on the upper portion of the supporting seat, the bearing plate is installed at the output end of the first electric sliding table, the two supporting rollers are rotatably installed on the upper portion of the bearing plate, the swinging motor is installed on the side portion of the bearing plate, the swinging motor is in transmission connection with one supporting roller, the arc-shaped supporting plate frame is arranged on the upper portions of the two supporting rollers, the bearing frame is installed on the upper portion of the arc-shaped supporting plate, and the fixing piece is installed on the side portion of the bearing frame;

the moving assembly comprises a supporting frame, a second electric sliding table and a third electric sliding table, the supporting frame is installed on the upper portion of the supporting seat, the second electric sliding table is installed on the lower portion of the center of the supporting frame, the third electric sliding table is installed at the output end of the second electric sliding table, and the third electric sliding table is located on the upper portion of the bearing frame;

the scanning assembly comprises a support, a steering motor, a clamp and a binocular camera, wherein the support is arranged at the output end of the third electric sliding table, the steering motor is arranged at the side part of the support frame, a transmission shaft is arranged at the output end of the steering motor, the clamp is arranged at the side part of the transmission shaft, the binocular camera is arranged at the inner side of the clamp, and the shooting end of the binocular camera is opposite to the upper part of the bearing frame.

As a preferable technical scheme of the invention, the supporting seat comprises a first supporting plate, a plurality of stand columns and a second supporting plate, wherein the stand columns are respectively arranged on the upper parts of the first supporting plate, the second supporting plate is arranged on the upper parts of the stand columns, and the first electric sliding table is arranged on the upper parts of the second supporting plate.

As a preferable technical scheme of the invention, a sliding rail is arranged at the upper part of the second supporting plate, a sliding block is arranged at the upper part of the sliding rail in a sliding manner, and the upper wall of the sliding block is connected with the lower wall of the bearing plate.

As a preferable technical scheme of the invention, vertical plates matched with the two supporting rollers are arranged at the upper parts of two sides of the bearing plate, and the swing motor is arranged at the side parts of the vertical plates.

As a preferable technical scheme of the invention, the outer Zhou Jun sleeves of the two supporting rollers are provided with rubber sleeves, and the surfaces of the rubber sleeves are provided with patterns for increasing friction force.

As a preferable technical scheme of the invention, the fixing pieces are provided with a plurality of fixing pieces, each fixing piece comprises an electric push rod and a pressing block, the electric push rods are respectively arranged on the side parts of the bearing frame, and the pressing blocks are arranged at the output ends of the electric push rods.

As a preferable technical scheme of the invention, the included angles between the plane to which the moving track of the first electric sliding table belongs, the plane to which the moving track of the second electric sliding table belongs and the plane to which the moving track of the third electric sliding table belongs are 90 degrees.

As a preferable technical scheme of the invention, a notch is arranged at the lower part of the bracket, the transmission shaft extends into the inner side of the notch, and the clamp is positioned on the inner side of the notch.

As the preferable technical scheme of the invention, the clamp comprises a connecting block and two clamping plates, wherein the connecting block is arranged at the lower part of the transmission shaft, the two clamping plates are slidably arranged at the lower part of the connecting block, the two clamping plates are connected through bolts, and the binocular camera is arranged between the two clamping plates.

In a second aspect, the present invention also provides a method for using a binocular stereoscopic vision-based three-dimensional scanning method, comprising the steps of:

s1, mounting a die to be tested: placing the die to be tested on the upper part of the bearing frame, and fixing the die to be tested from two sides through fixing pieces;

s2, the scanning assembly stretches into the inner cavity of the die: the first electric sliding table is operated to drive the bearing plate to move and drive the bearing frame to move, so that the die to be tested moves to the lower part of the scanning assembly, the second electric sliding table drives the third electric sliding table to move, the scanning assembly is opposite to the upper part of the cavity to be tested, and the scanning assembly is driven to move downwards by the operation of the third electric sliding table, so that the scanning assembly stretches into the cavity of the die;

s3, scanning: the operation of the operation binocular camera drives transmission shaft and anchor clamps through turning to the operation of motor and rotates, and then drives the rotation of binocular camera, scans the inner wall of mould inner chamber to the position of the two mesh cameras of operation first electronic slip table, second electronic slip table and third electronic slip table in the inner chamber, simultaneously, operation swing motor makes swing motor drive a backing roll and rotates, utilizes the frictional force of backing roll and arc backup pad, drives the arc backup pad and takes place partial tilt, makes the mould slope, and then makes the scope of scanning wider.

(III) beneficial effects

1. The invention provides a three-dimensional scanning device based on binocular stereoscopic vision, which comprises a bearing assembly, a first electric sliding table, a bearing plate, two supporting rollers, a swinging motor, an arc-shaped supporting plate, a bearing frame and a fixing piece, wherein a die to be detected is placed at the upper part of the bearing frame, the die to be detected is fixed from two sides through the fixing piece, the die to be detected is conveniently driven to move to a supporting frame part through the operation of the first electric sliding table, the swinging motor is operated to drive one supporting roller to rotate, and the friction force between the supporting roller and the arc-shaped supporting plate is utilized to drive the arc-shaped supporting plate to incline partially, so that the die is inclined, and the scanning range is wider;

2. the three-dimensional scanning device based on binocular stereoscopic vision provided by the invention has the advantages that the moving assembly comprises the support frame, the second electric sliding table and the third electric sliding table, the movement of the scanning assembly in the two-axis direction is realized through the cooperation of the second electric sliding table and the third electric sliding table, the first electric sliding table drives the die to be detected to move, the three are matched to realize the movement in the three-axis direction, and the die can be scanned conveniently;

3. the three-dimensional scanning device based on binocular stereoscopic vision provided by the invention comprises the scanning assembly, the bracket, the steering motor, the clamp and the binocular camera, wherein the clamp and the binocular camera are driven to rotate through the operation of the steering motor, so that the angle of the binocular camera is adjusted, and the scanning range is wider.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

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

FIG. 2 is a schematic front view in cross section of the present invention;

FIG. 3 is a schematic view of the support roller and arcuate support plate portion of the present invention;

FIG. 4 is a schematic view of a portion of the swing motor of the present invention;

FIG. 5 is an enlarged schematic view of FIG. 2A in accordance with the present invention;

fig. 6 is a schematic view of a portion of the structure of the clamp of the present invention.

In the figure: 100. a support base; 110. a first support plate; 120. a column; 130. a second support plate; 131. a slide rail; 132. a slide block; 200. a carrier assembly; 210. a first electric slipway; 220. a carrying plate; 221. a vertical plate; 230. a support roller; 231. a rubber sleeve; 240. a swing motor; 250. an arc-shaped supporting plate; 260. a carrier; 270. a fixing member; 271. an electric push rod; 272. briquetting; 300. a moving assembly; 310. a support frame; 320. the second electric sliding table; 330. a third electric slipway; 400. a scanning assembly; 410. a bracket; 411. a notch; 420. a steering motor; 430. a clamp; 431. a connecting block; 432. a clamping plate; 440. a binocular camera; 450. and a transmission shaft.

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present invention, it should be understood that the terms "longitudinal," "upper," "lower," "left," "right," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

As shown in fig. 1 to 6, the three-dimensional scanning device based on binocular stereo vision includes a supporting seat 100, a carrying component 200, a moving component 300 and a scanning component 400, wherein the carrying component 200 is installed on the upper portion of the supporting seat 100, the moving component 300 is installed on the upper portion of the supporting seat 100, and the scanning component 400 is installed on the output end of the moving component 300.

The bearing assembly 200 comprises a first electric sliding table 210, a bearing plate 220, two supporting rollers 230, a swinging motor 240, an arc-shaped supporting plate 250, a bearing frame 260 and a fixing piece 270, wherein the first electric sliding table 210 is installed on the upper part of the supporting seat 100 through bolts, the bearing plate 220 is installed at the output end of the first electric sliding table 210, the two supporting rollers 230 are rotatably installed on the upper part of the bearing plate 220 through bearings, in particular, in order to facilitate the installation of the supporting rollers 230, vertical plates 221 matched with the two supporting rollers 230 are installed on the upper parts of two sides of the bearing plate 220, and the swinging motor 240 is installed on the side parts of the vertical plates 221 through motor seats; the swing motor 240 is installed at the lateral part of the bearing plate 220, the swing motor 240 is in transmission connection with one supporting roller 230, the arc-shaped supporting plates 250 are erected at the upper parts of the two supporting rollers 230, and in particular, during the setting, in order to increase the friction force between the supporting rollers 230 and the arc-shaped supporting plates 250, so that the subsequent arc-shaped supporting plates 250 swing along with the supporting rollers 230, the outer Zhou Jun sleeves of the two supporting rollers 230 are provided with rubber sleeves 231, the surfaces of the rubber sleeves 231 are provided with patterns for increasing the friction force, the bearing frame 260 is installed at the upper parts of the arc-shaped supporting plates 250, and the fixing pieces 270 are installed at the lateral parts of the bearing frame 260.

In this embodiment, mounting 270 is provided with a plurality of, and mounting 270 includes electric putter 271 and briquetting 272, and a plurality of electric putter 271 are installed respectively in the lateral part that bears frame 260, and briquetting 272 passes through the screw to be installed in the output of electric putter 271, and during the concrete use, through the operation drive briquetting 272 of electric putter 271 removal, and then contradict with the outer wall of the mould that awaits measuring, realize the fixed to the mould that awaits measuring, in order to prevent that briquetting 272 from damaging the mould that awaits measuring, the lateral part of briquetting 272 still can handing over flexible backing plates such as rubber pad, silica gel pad.

The moving assembly 300 comprises a supporting frame 310, a second electric sliding table 320 and a third electric sliding table 330, wherein the supporting frame 310 is installed on the upper portion of the supporting seat 100 through bolts, the cross section of the supporting frame 310 is in a n-shaped arrangement, the second electric sliding table 320 is installed on the lower center portion of the supporting frame 310, the third electric sliding table 330 is installed on the output end of the second electric sliding table 320 through bolts, and the third electric sliding table 330 is located on the upper portion of the bearing frame 260.

In a specific setting, in order to achieve a good adjustment effect, scanning in the three-axis direction is achieved, and the included angles between the plane to which the moving track of the first electric sliding table 210 belongs, the plane to which the moving track of the second electric sliding table 320 belongs, and the plane to which the moving track of the third electric sliding table 330 belongs are all 90 °.

The scanning assembly 400 includes a bracket 410, a steering motor 420, a clamp 430 and a binocular camera 440, the bracket 410 is mounted at the output end of the third electric sliding table 330, the steering motor 420 is mounted at the side of the supporting frame 310 through a motor seat, the output end of the steering motor 420 is mounted with a transmission shaft 450, the clamp 430 is mounted at the side of the transmission shaft 450, the binocular camera 440 is mounted at the inner side of the clamp 430, and the image pick-up end of the binocular camera 440 is opposite to the upper part of the bearing frame 260.

When the bracket is specifically arranged, the lower part of the bracket 410 is provided with the notch 411, the notch 411 enables the cross section of the bracket 410 to be in an inverted Y-shaped arrangement, the transmission shaft 450 stretches into the inner side of the notch 411, and the clamp 430 is positioned on the inner side of the notch 411.

Specifically, in order to achieve a good supporting effect, the supporting base 100 includes a first supporting plate 110, a plurality of columns 120 and a second supporting plate 130, the columns 120 are respectively installed on the upper portions of the first supporting plate 110, the second supporting plate 130 is installed on the upper portions of the columns 120, the first electric sliding table 210 is installed on the upper portions of the second supporting plate 130, in order to guide the first electric sliding table 210 in a specific setting, a sliding rail 131 is installed on the upper portion of the second supporting plate 130, a sliding block 132 is slidably installed on the upper portion of the sliding rail 131, and the upper wall of the sliding block 132 is connected with the lower wall of the bearing plate 220.

In this embodiment, the clamp 430 includes a connection block 431 and two clamping plates 432, the connection block 431 is mounted at the lower portion of the transmission shaft 450, the two clamping plates 432 are slidably mounted at the lower portion of the connection block 431, the two clamping plates 432 are connected by bolts, and the binocular camera 440 is mounted between the two clamping plates 432.

In addition, the invention also provides a three-dimensional scanning method based on binocular stereoscopic vision, which comprises the following steps:

s1, mounting a die to be tested: placing the mold to be tested on the upper part of the bearing frame 260, and fixing the mold to be tested from two sides through the fixing pieces 270;

s2, the scanning assembly 400 stretches into the inner cavity of the die: the first electric sliding table 210 is operated to drive the bearing plate 220 to move and drive the bearing frame 260 to move, so that the die to be tested moves to the lower part of the scanning assembly 400, the second electric sliding table 320 drives the third electric sliding table 330 to move, so that the scanning assembly 400 is opposite to the upper part of the cavity to be tested, and the third electric sliding table 330 is operated to drive the scanning assembly 400 to move downwards, so that the scanning assembly 400 stretches into the die cavity;

s3, scanning: the operation of the binocular camera 440 drives the transmission shaft 450 and the clamp 430 to rotate through the operation of the steering motor 420, and then drives the binocular camera 440 to rotate, scans the inner wall of the inner cavity of the die, and operates the first electric sliding table 210, the second electric sliding table 320 and the third electric sliding table 330 to adjust the position of the binocular camera 440 in the inner cavity, and simultaneously, operates the swinging motor 240 to drive the swinging motor 240 to rotate a supporting roller 230, and drives the arc-shaped supporting plate 250 to incline partially by using the friction force of the supporting roller 230 and the arc-shaped supporting plate 250, so that the die inclines, and the scanning range is wider.

It should be noted that, the scanning assembly 400 does not extend into the cavity of the mold, and can scan the upper wall of the mold.

To sum up: the invention simply and conveniently realizes the scanning of the inner cavity of the die, is convenient for acquiring the image of the inner cavity of the die and is convenient for subsequent detection.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. Three-dimensional scanning device based on binocular stereovision, including supporting seat (100), bearing assembly (200), remove subassembly (300) and scanning subassembly (400), its characterized in that: the bearing assembly (200) is installed on the upper portion of the supporting seat (100), the moving assembly (300) is installed on the upper portion of the supporting seat (100), the scanning assembly (400) is installed on the output end of the moving assembly (300), wherein:

the bearing assembly (200) comprises a first electric sliding table (210), a bearing plate (220), two supporting rollers (230), a swinging motor (240), an arc-shaped supporting plate (250), a bearing frame (260) and a fixing piece (270), wherein the first electric sliding table (210) is installed on the upper portion of the supporting seat (100), the bearing plate (220) is installed at the output end of the first electric sliding table (210), the two supporting rollers (230) are rotatably installed on the upper portion of the bearing plate (220), the swinging motor (240) is installed on the side portion of the bearing plate (220), the swinging motor (240) is in transmission connection with one supporting roller (230), the arc-shaped supporting plate (250) is erected on the upper portions of the two supporting rollers (230), the bearing frame (260) is installed on the upper portion of the arc-shaped supporting plate (250), and the fixing piece (270) is installed on the side portion of the bearing frame (260);

the moving assembly (300) comprises a supporting frame (310), a second electric sliding table (320) and a third electric sliding table (330), the supporting frame (310) is installed on the upper portion of the supporting seat (100), the second electric sliding table (320) is installed on the lower portion of the center of the supporting frame (310), the third electric sliding table (330) is installed at the output end of the second electric sliding table (320), and the third electric sliding table (330) is located on the upper portion of the bearing frame (260);

the scanning assembly (400) comprises a support (410), a steering motor (420), a clamp (430) and a binocular camera (440), wherein the support (410) is installed at the output end of the third electric sliding table (330), the steering motor (420) is installed at the side part of the support frame (310), a transmission shaft (450) is installed at the output end of the steering motor (420), the clamp (430) is installed at the side part of the transmission shaft (450), the binocular camera (440) is installed at the inner side of the clamp (430), and the camera end of the binocular camera (440) is opposite to the upper part of the bearing frame (260).

2. The binocular stereoscopic vision-based three-dimensional scanning apparatus of claim 1, wherein: the supporting seat (100) comprises a first supporting plate (110), a plurality of upright posts (120) and a second supporting plate (130), wherein the upright posts (120) are respectively arranged on the upper parts of the first supporting plate (110), the second supporting plate (130) is arranged on the upper parts of the upright posts (120), and the first electric sliding table (210) is arranged on the upper parts of the second supporting plate (130).

3. The binocular stereoscopic vision-based three-dimensional scanning apparatus of claim 2, wherein: the upper portion of second backup pad (130) is installed slide rail (131), the upper portion slidable mounting of slide rail (131) has slider (132), the upper wall of slider (132) with the lower wall of loading board (220) links to each other.

4. The binocular stereoscopic vision-based three-dimensional scanning apparatus of claim 1, wherein: and vertical plates (221) matched with the two supporting rollers (230) are arranged at the upper parts of two sides of the bearing plate (220), and the swing motor (240) is arranged at the side parts of the vertical plates (221).

5. The binocular stereoscopic vision-based three-dimensional scanning apparatus of claim 1, wherein: the outer Zhou Jun of the two supporting rollers (230) is sleeved with a rubber sleeve (231), and the surface of the rubber sleeve (231) is provided with patterns for increasing friction force.

6. The binocular stereoscopic vision-based three-dimensional scanning apparatus of claim 1, wherein: the fixing pieces (270) are provided with a plurality of fixing pieces (270), each fixing piece (270) comprises an electric push rod (271) and a pressing block (272), the electric push rods (271) are respectively installed on the side portions of the bearing frames (260), and the pressing blocks (272) are installed at the output ends of the electric push rods (271).

7. The binocular stereoscopic vision-based three-dimensional scanning apparatus of claim 1, wherein: the included angles between the plane of the moving track of the first electric sliding table (210), the plane of the moving track of the second electric sliding table (320) and the plane of the moving track of the third electric sliding table (330) are 90 degrees.

8. The binocular stereoscopic vision-based three-dimensional scanning apparatus of claim 1, wherein: the lower part of the bracket (410) is provided with a notch (411), the transmission shaft (450) stretches into the inner side of the notch (411), and the clamp (430) is positioned on the inner side of the notch (411).

9. The binocular stereoscopic vision-based three-dimensional scanning apparatus of claim 1, wherein: the clamp (430) comprises a connecting block (431) and two clamping plates (432), the connecting block (431) is mounted on the lower portion of the transmission shaft (450), the two clamping plates (432) are slidably mounted on the lower portion of the connecting block (431), the two clamping plates (432) are connected through bolts, and the binocular camera (440) is mounted between the two clamping plates (432).

10. The three-dimensional scanning method based on binocular stereoscopic vision is characterized by comprising the following steps of: the method specifically comprises the following steps:

s1, mounting a die to be tested: placing the die to be tested on the upper part of the bearing frame, and fixing the die to be tested from two sides through fixing pieces;

s2, the scanning assembly stretches into the inner cavity of the die: the first electric sliding table is operated to drive the bearing plate to move and drive the bearing frame to move, so that the die to be tested moves to the lower part of the scanning assembly, the second electric sliding table drives the third electric sliding table to move, the scanning assembly is opposite to the upper part of the cavity to be tested, and the scanning assembly is driven to move downwards by the operation of the third electric sliding table, so that the scanning assembly stretches into the cavity of the die;

s3, scanning: the operation of the operation binocular camera drives transmission shaft and anchor clamps through turning to the operation of motor and rotates, and then drives the rotation of binocular camera, scans the inner wall of mould inner chamber to the position of the two mesh cameras of operation first electronic slip table, second electronic slip table and third electronic slip table in the inner chamber, simultaneously, operation swing motor makes swing motor drive a backing roll and rotates, utilizes the frictional force of backing roll and arc backup pad, drives the arc backup pad and takes place partial tilt, makes the mould slope, and then makes the scope of scanning wider.