Double-projection image type roller measuring mechanism

Abstract

The invention discloses a double-projection image type roller measuring mechanism which is composed of a measuring platform, a movable frame and a measuring system, and the measuring platform is provided with a horizontal table top, a seat body and a track and is used for erecting a roller to be measured. The movable frame is arranged between the rails in a sliding mode, comprises a bottom plate, a first rod body, a second rod body and a transverse rod and wraps the roller in a surrounding mode. According to the measuring system, a first measuring instrument and a second measuring instrument are arranged on a first rod body and a second rod body and are connected to a measuring host, the first measuring instrument and the second measuring instrument are composed of emitters and receivers, and double-side projection space is formed to be partially overlapped with the edge of the roller. The movable frame moves along the track and is matched with the measurement host to receive the image for analysis, so that the diameter change, the external dimension and the roundness of the roller can be measured, and the device and the method are suitable for high-precision measurement of the large roller.

Description

Technical Field

[0001] The present invention relates to the technical field of optical measurement, and particularly to an image measurement device for high-precision outer dimension and roundness analysis of large rollers, mainly a double-projection image type roller measurement mechanism that performs non-contact measurement using double-projection images. Background Art

[0002] In the manufacturing and quality control processes of large rollers, roundness and outer dimensions are key geometric parameters affecting product performance. However, traditional technologies still have significant limitations for such measurements. Current commonly used measurement methods, such as contact tools like micrometers or plate gauges, mainly obtain local dimension values of the roller through manual point-by-point detection. Such tools are not only difficult to perform full-circumference measurement on the roller but also unable to depict the overall contour change in real time, making it difficult to effectively evaluate the roundness of the roller or the full-size contour error in the length direction. Moreover, the diameter of large rollers can reach several hundred millimeters to several meters, with a heavy structure and difficult to turn over. After segmental measurement and data reconstruction, it is extremely vulnerable to clamping errors or reference deviations, resulting in distortion.

[0003] On the other hand, although existing optical or laser scanning measurement devices have the advantages of non-contact and fast, most devices require manual calibration and are difficult to maintain stable long-distance focusing on large workpieces. Most existing systems only adopt single-sided projection or single-side view design, which is easily interfered by factors such as roller shaking, center offset, and inclined installation, resulting in inaccurate measurement of both size and roundness data. If the roller undergoes thermal expansion deformation under the heating state, existing measurement methods are also difficult to simulate the size change under actual working conditions, further affecting the accuracy of the factory inspection of the roller. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a double-projection image type roller measurement mechanism.

[0005] To achieve the above purpose, the technical solution provided by an embodiment of the present invention is as follows:

[0006] A double-projection image type roller measurement mechanism, comprising:

[0007] A measurement platform, which forms a horizontal tabletop. Two bodies are erected on the horizontal tabletop. A roller is erected between the two bodies. Moreover, two tracks are fixed on the horizontal tabletop, and the two tracks are arranged parallel to the roller;

[0008] A moving frame, which includes a bottom plate, a first rod, a second rod and a cross bar. The bottom plate is slidably disposed between two of the tracks, and the bottom plate is perpendicular to the tracks. The first rod and the second rod are both standing and erected on the bottom plate, and the first rod and the second rod are respectively located on both sides of the roller. Moreover, the cross bar is connected between the first rod and the second rod, and a box-shaped area is formed by enclosing the roller with the bottom plate, the first rod, the second rod and the cross bar; and

[0009] A measuring system, which includes a first measuring instrument, a second measuring instrument and a measuring host. The first measuring instrument is fixed to the first rod, and the second measuring instrument is fixed to the second rod. Moreover, both the first measuring instrument and the second measuring instrument include a transmitter and a receiver, and a projection space is formed between the transmitter and the receiver. The two side edges of the roller partially overlap with the two projection spaces. The measuring host is connected and receives the images of the roller projected by the first measuring instrument and the second measuring instrument, and moves along the track in cooperation with the moving frame, so as to measure and obtain the diameter change and the external dimensions of the roller.

[0010] As a further improvement of the present invention, a fixed seat is provided at one end of the measuring platform, and a driver is installed at the fixed seat. The driver is connected to one end of the roller, and the driver drives the roller to rotate at a constant speed, so that the measuring system receives double projection images to obtain the roundness of the roller.

[0011] As a further improvement of the present invention, a rotary joint is installed at the other end of the measuring platform. The rotary joint is connected to one end of the roller through a pipeline joint, and a heating fluid is injected into the roller through the pipeline joint, thereby simulating the working temperature of the roller.

[0012] As a further improvement of the present invention, a connecting component is installed between the roller and the driver, and the connecting component includes two universal joints and a telescopic rod.

[0013] As a further improvement of the present invention, both the first rod and the second rod are locked to the bottom plate by an adjusting seat. The adjusting seat is provided with a plurality of oval holes, and the bottom plate is provided with a plurality of screw holes. Moreover, the adjusting seat is locked to any of the screw holes by a plurality of bolts passing through the oval holes, so as to adjust the distance between the first rod and the second rod.

[0014] As a further improvement of the present invention, a support member is locked to the end of both the first rod and the second rod away from the bottom plate, and the cross bar is locked to the support member.

[0015] As a further improvement of the present invention, a fine-tuning device is installed above the base body of the measurement platform. The fine-tuning device includes a fixed plate and a displacement plate. The fixed plate is fixed to the base body, and the displacement plate is placed on the fixed plate. Both ends of the roller are provided with a pivot seat, and the pivot seat is fixed to the displacement plate. The fixed plate protrudes with a block at both ends, and a translation screw is locked through the block. The end of the translation screw presses against the outside of the displacement plate. By fine-tuning the two translation screws, the pivot seat can adjust the horizontal position. At least one strip-shaped hole is opened on both sides of the pivot seat on the displacement plate. A fixing screw is passed through the strip-shaped hole, and the fixing screw is locked to the fixed plate. When the fixing screw is tightened, the displacement plate is fixed.

[0016] As a further improvement of the present invention, a plurality of top-height screws are locked on the upper surface of the displacement plate, and the end of the top-height screw presses against the fixed plate. By screwing in the top-height screw, the height position of the pivot seat is adjusted. A positioning nut is screwed on the top-height screw.

[0017] As a further improvement of the present invention, a length scale is fixed on the horizontal tabletop of the measurement platform, and an indicating needle is fixed at the bottom plate of the moving frame. The indicating needle points to the length scale to represent the manual displacement distance of the moving frame.

[0018] As a further improvement of the present invention, at least one rack is fixed on the horizontal tabletop of the measurement platform, and at least one motor is fixed at the bottom plate of the moving frame. The motor meshes with the rack to drive the moving frame to form an automatic displacement.

[0019] The beneficial effects of the present invention are:

[0020] The first main object of the present invention is that the first measuring instrument and the second measuring instrument are respectively arranged on both sides of the roller to form a double-projection image measurement technology. The first measuring instrument and the second measuring instrument respectively emit light rays by the transmitter, and the receiver receives the projection images blocked by the edge part of the roller, so as to quickly measure the contour, diameter and roundness of the roller. The use of the double-projection mechanism can greatly reduce the detection errors caused by yaw, deformation or perspective errors, so as to meet the precision detection requirements of large rollers.

[0021] The second main object of the present invention is that the moving frame is composed of the bottom plate, the first rod body, the second rod body and the cross bar to form a rigid structure with the ability to resist deformation. When the surface of the measurement platform is uneven, the roller is installed obliquely or the track is deformed by external force, the moving frame can still maintain the relative parallel position of the first and second measuring instruments in space. This design ensures the relative stability of the two-side measurement optical axes, avoids the accumulation of measurement errors caused by poor structure, and maintains the consistency and symmetry of the projection space, thereby effectively improving the measurement accuracy of the external dimensions and roundness.

[0022] The third main object of the present invention is to have a height-adjustable structure. Through the adjustment seat and multi-point screw holes on the moving frame, the distance between the first rod and the second rod can be changed. Through the screw locking adjustment of the translation screw and the height-lifting screw of the fine adjustment device, the horizontal and height positions of the roller can be adjusted. Through the universal joint and the telescopic connecting rod in the connecting component, non-coaxial and length elastic engagement functions can be provided. The above-mentioned multiple adjustment mechanisms can effectively correspond to roller styles with different diameters, lengths, and center heights, making the present invention have good versatility and elastic application ranges.

[0023] Other objects, advantages, and novel features of the present invention will become more apparent from the following detailed description and related drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a perspective view of the present invention.

[0026] Figure 2 It is a partial enlarged perspective view of the present invention at the moving frame.

[0027] Figure 3 It is a schematic diagram of the present invention performing a moving measurement operation.

[0028] Figure 4 It is a schematic diagram of the present invention performing a dual-projection image measurement.

[0029] Figure 5 It is a schematic diagram of the display screen of the measurement host of the present invention.

[0030] Figure 6 It is a schematic diagram of the present invention equipped with a driver.

[0031] Figure 7 It is a schematic diagram of the present invention adjusting the position of the roller with a fine adjustment device.

[0032] Figure 8 It is a schematic diagram of another embodiment of the present invention.

[0033] Figure 9 It is a schematic diagram of yet another embodiment of the present invention.

[0034] In the figure: 10, measurement platform; 11, horizontal tabletop; 12, base body; 13, track; 14, fixed seat; 15, driver; 16, connecting component; 161, universal joint; 162, telescopic connecting rod; 17, rotary joint; 171, pipeline joint; 18, length scale; 19, rack; 20, moving frame; 20a, square area; 21, bottom plate; 211, screw hole; 22, first rod body; 23, second rod body; 24, cross bar; 25, adjusting seat; 251, oval hole; 252, bolt; 26, support member; 27, indicating needle; 28, motor; 30, measurement system; 30a, projection space; 31, first measuring instrument; 32, second measuring instrument; 33, measurement host; 34, transmitter; 35, receiver; 40, roller; 41, pivot seat; 50, fine adjustment device; 51, fixing plate; 511, block; 52, displacement plate; 521, strip-shaped hole; 53, fixing screw; 54, translation screw; 55, lifting screw; 551, positioning nut. Detailed implementation manner

[0035] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0036] Please refer to Figures 1 - 5 , this application embodiment discloses a double-projection image type roller measurement mechanism, which includes: a measurement platform 10, a moving frame 20 and a measurement system 30. The measurement platform 10 is used to mount a roller 40 to be measured, and move the measurement system 30 through the moving frame 20, thereby accurately measuring the dimensions, diameter changes and roundness of each part of the large roller 40, that is, the accuracy of the measurement operation of the new roller can be improved. Among them:

[0037] A measurement platform 10 is formed with a horizontal tabletop 11. Two pedestals 12 are erected on the horizontal tabletop 11. A roller 40 is to be erected between the two pedestals 12. Moreover, two tracks 13 are fixed on the horizontal tabletop 11. The two tracks 13 and the roller 40 are arranged parallel to each other, so that the roller 40 can be stably positioned at the measurement position. A moving frame 20 includes a bottom plate 21, a first rod 22, a second rod 23 and a cross bar 24. The bottom plate 21 is slidably disposed between the two tracks 13, and the bottom plate 21 is perpendicular to the tracks 13, so that the moving direction is the same as the axis direction of the roller 40, which helps to perform longitudinal scanning measurement. The first rod 22 and the second rod 23 are both standing and erected on the bottom plate 21, and the first rod 22 and the second rod 23 are respectively located on both sides of the roller 40. Moreover, the cross bar 24 is connected between the first rod 22 and the second rod 23. A square area 20a is formed by enclosing the roller 40 with the bottom plate 21, the first rod 22, the second rod 23 and the cross bar 24. The square area 20a can serve as the constituent frame of the measurement system 30, providing good structural rigidity and shock resistance to stably obtain the projection image. A measurement system 30 includes a first measuring instrument 31, a second measuring instrument 32 and a measurement host 33. The first measuring instrument 31 is fixed on the first rod 22, and the second measuring instrument 32 is fixed on the second rod 23. Moreover, both the first measuring instrument 31 and the second measuring instrument 32 include a transmitter 34 and a receiver 35, and a projection space 30a is formed between the transmitter 34 and the receiver 35. The two side edges of the roller 40 partially overlap with the two projection spaces 30a. The two projection spaces 30a can jointly scan the two sides of the roller 40 synchronously, thereby forming an optical shielding imaging effect. The measurement host 33 is connected and receives the images of the roller 40 projected by the first measuring instrument 31 and the second measuring instrument 32, and is used to analyze the distance change between the outer contour lines on both sides of the roller 40. In addition, in cooperation with the movement of the moving frame 20 along the track 13, the diameter change and the external dimensions of the roller 40 can be measured. That is, the measurement system 30 can synchronously obtain the left and right side images of the roller 40, and automatically achieve high-resolution imaging and precise calculation according to the manually set diameter of the roller, thereby effectively providing the external dimension information of the continuous cross section, and is applicable to the detection of items such as size deviation, roundness, ellipticity or taper of the large roller 40, and can achieve precise measurement with a minimum size unit of 0.001 mm.

[0038] Among them, the moving frame 20 is jointly composed of the bottom plate 21, the first rod 22, the second rod 23 and the cross bar 24 to form a quadrilateral rigid frame structure. The first rod 22 and the second rod 23 are respectively vertically fixed on both sides of the bottom plate 21, and the cross bar 24 spans and connects the upper ends of the first rod 22 and the second rod 23 to form a closed and stable structure. The said closed structure has high rigidity and geometric stability, and can maintain the relative parallel positioning relationship between the first measuring instrument 31 and the second measuring instrument 32 in space, so that it is not affected by changes in the external environment. The so-called external environment, for example, when the surface of the measuring platform 10 is not completely horizontal, the roller 40 is not completely parallel to the track 13, or the track 13 has slight bending or warping due to use or temperature change, the first measuring instrument 31 and the second measuring instrument 32 can still maintain the same inclination or position offset. When the changes of the first measuring instrument 31 and the second measuring instrument 32 are the same, the measured results of the two can form complementary calculations, thereby improving the measurement accuracy of the overall outer dimension and true roundness of the roller 40 and effectively eliminating the influence of external interference on the measurement results.

[0039] Both the first rod 22 and the second rod 23 are locked to the bottom plate 21 by an adjustment seat 25. The adjustment seat 25 is provided with a plurality of oval holes 251, and the bottom plate 21 is provided with a plurality of screw holes 211. The adjustment seat 25 is locked to any of the screw holes 211 by a plurality of bolts 252 passing through the oval holes 251, thereby adjusting the distance between the first rod 22 and the second rod 23. By this means, the span length of the cross bar 24 can be changed, that is, the different widths of the projection space 30a can be adjusted to adapt to the size change of the roller 40, so that the measuring system 30 can cover different measurement requirements. At the ends of the first rod 22 and the second rod 23 far from the bottom plate 21, a support member 26 is locked respectively, and the cross bar 24 is locked to the support member 26. When adjusting the width of the projection space 30a, the locking of the cross bar 24 by the support member 26 can be easily relaxed, so that the cross bar 24 does not affect the adjustment of the distance between the first rod 22 and the second rod 23. The locked cross bar 24 is used to fix the upper ends of the first rod 22 and the second rod 23, thereby providing sufficient rigidity for the moving frame 20, effectively reducing the displacement vibration of the moving frame 20, and eliminating the image jitter generated by the vibration of the transmitter 34 and the receiver 35. Among them, the moving frame 20 can form a detachable and modular connection design, and further allows the cross bar 24 to be adjusted up and down in the vertical direction, so that the height of the projection space 30a is variable, so as to be applicable to measuring rollers 40 with different diameters.

[0040] Please start from Figure 6 and Figure 7As can be seen, a fixed seat 14 is provided at one end of the measurement platform 10, and a driver 15 is installed at the fixed seat 14. The driver 15 is connected to one end of the roller 40, and the driver 15 drives the roller 40 to rotate at a constant speed. During the rotation process, the outer diameter of the roller 40 axially passes through the projection space 30a defined by the measurement system 30. Then, during one rotation, the first measuring instrument 31 and the second measuring instrument 32 respectively emit parallel light to the receiver 35 by the emitter 34, and the measurement host 33 receives and records the double-projection images from the receiver 35. Through the superposition analysis of the synchronous double images, the radius change amount of each point on the outer circumference of the roller 40 can be accurately calculated, and based on this, its roundness deviation can be deduced. Accordingly, the measurement system 30 can receive the double-projection images and know the roundness of the roller 40. Also, a connection assembly 16 is installed between the roller 40 and the driver 15, and the connection assembly 16 includes two universal joints 161 and a telescopic rod 162. The universal joint 161 can provide freedom compensation in different angular directions, allowing the roller 40 and the driver 15 to have different axes, so that the rotational torque can be stably transmitted, avoiding the influence of axis error on the rotational stability and measurement accuracy, thereby enabling the measurement platform 10 and the driver 15 to be applicable to roller 40s with different diameters to be measured. And the telescopic rod 162 has a structure characteristic of being extensible or contractible, thereby being able to be adjusted according to the different length dimensions of the roller 40, so as to effectively improve the applicability of this creation.

[0041] A rotary joint 17 is installed at the other end of the measurement platform 10. The rotary joint 17 is connected to one end of the roller 40 by a pipeline joint 171, and the heating fluid is injected into the interior of the roller 40 through the pipeline joint 171, thereby simulating the working temperature of the roller 40, so that the roller 40 presents a thermal state similar to the actual production environment during the measurement process. Since the roller 40 will maintain a relatively high working temperature for a long time during the actual machine production operation to keep the work-piece malleable, there will be an increase in size in the state of thermal expansion. If geometric measurement is only carried out at room temperature, the size and shape changes during actual operation cannot be reflected, resulting in inspection deviation of the roller 40. Therefore, through the thermal load simulation environment realized by the rotary joint 17, it is further detected whether the roller 40 still meets the geometric tolerance and roundness tolerance range after heating, as the basis for determining whether to enter the actual use in the production line, effectively ensuring the subsequent processing quality and reliability.

[0042] Then, in cooperation with Figure 7As shown, a fine-tuning device 50 is installed above the base 12 of the measurement platform 10. The fine-tuning device 50 includes a fixed plate 51 and a displacement plate 52. The fixed plate 51 is fixed to the base 12, and the displacement plate 52 is placed on the fixed plate 51. Both ends of the roller 40 are provided with a pivot seat 41, and the pivot seat 41 is fixed to the displacement plate 52, thereby pivotally connecting the roller 40 to provide its rotational support function and corresponding stability and coaxiality required for the measurement process. Both ends of the fixed plate 51 are convexly provided with a block 511, and a translation screw 54 is locked through the block 511. The end of the translation screw 54 presses against the outside of the displacement plate 52. By fine-tuning the two translation screws 54, the pivot seat 41 can adjust the horizontal position for lateral fine-tuning and correction, ensuring that during the erection process of the roller 40, the first measuring instrument 31 and the second measuring instrument 32 can be symmetrically installed on both sides of the axis of the roller 40, improving the measurement accuracy and reliability. A plurality of height-adjusting screws 55 are locked on the upper surface of the displacement plate 52, and the end of the height-adjusting screw 55 presses against the fixed plate 51. By screwing in the height-adjusting screw 55, the height position of the pivot seat 41 is adjusted, so that the central axis of the roller 40 can be slightly adjusted in the up and down directions according to actual measurement requirements, compensating for the height offset caused by the unevenness of the measurement platform 10, effectively maintaining the symmetry and horizontality of the two support points of the roller 40. The height-adjusting screw 55 is screwed with a positioning nut 551 to provide locking and anti-loosening effects after the adjustment is completed. At least one strip hole 521 is opened on both sides of the pivot seat 41 of the displacement plate 52. A fixing screw 53 is passed through the strip hole 521, and the fixing screw 53 is locked to the fixed plate 51. When the fixing screw 53 is tightened, the displacement plate 52 is fixed. Furthermore, after adjusting the plane position and height of the roller 40, the current position of the displacement plate 52 can be locked, and it will not slide or loosen during use, further strengthening the positioning accuracy and rotational stability of the roller 40.

[0043] For another embodiment of the present invention, please refer to Figure 8 As shown, a length scale 18 is fixed on the horizontal table surface 11 of the measurement platform 10, and an indicating needle 27 is fixed at the bottom plate 21 of the moving frame 20. The indicating needle 27 points to the length scale 18 to indicate the manual displacement distance of the moving frame 20. Thereby, when the operator performs manual operations, the operator can intuitively grasp the current position and displacement distance of the moving frame 20, which is helpful for quickly performing measurements or repeating measurements on specific sections of the roller 40. Moreover, the length scale 18 and the indicating needle 27 are combined to form a simple mechanical reading device, which has the advantages of durability, no power supply required, and real-time display, and is particularly suitable for detection environments with large changes in on-site conditions.

[0044] For still another embodiment of the present invention, please refer to Figure 9As shown, at least one rack 19 is fixed on the horizontal tabletop 11 of the measurement platform 10, and at least one motor 28 is fixed at the bottom plate 21 of the moving frame 20. The motor 28 is engaged with the rack 19 to drive the moving frame 20 to form an automatic displacement. The motor 28 can be connected to the measurement host 33 to form an automatic control module, and accurately move to a predetermined measurement point according to the input parameters, improving the measurement efficiency and positioning accuracy. Due to the dual displacement modes of manual and automatic, the moving frame 20 can not only perform precise automatic measurement operations, but also facilitate on-site personnel to switch to the manual mode during initial setup or quick inspection, providing high flexibility and convenience of use.

[0045] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A double-projection imaging type roller measuring mechanism, characterized in that, Comprising: A measurement platform, which has a horizontal tabletop formed thereon. Two bodies are erected on the horizontal tabletop. A roller is erected between the two bodies. Further, two tracks are fixed on the horizontal tabletop, and the two tracks are arranged parallel to the roller; A moving frame, which includes a bottom plate, a first rod, a second rod and a cross bar. The bottom plate is slidably disposed between the two tracks, and the bottom plate is perpendicular to the tracks. The first rod and the second rod are both standing and erected on the bottom plate, and the first rod and the second rod are respectively located on both sides of the roller. Further, the cross bar is connected between the first rod and the second rod, and a box-shaped area for enclosing the roller is formed by the bottom plate, the first rod, the second rod and the cross bar; and A measurement system, which includes a first measuring instrument, a second measuring instrument and a measurement host. The first measuring instrument is fixed on the first rod, and the second measuring instrument is fixed on the second rod. Further, both the first measuring instrument and the second measuring instrument include a transmitter and a receiver, and a projection space is formed between the transmitter and the receiver. The two side edges of the roller partially overlap with the two projection spaces. The measurement host is connected and receives the images of the roller projected by the first measuring instrument and the second measuring instrument, and moves along the track in cooperation with the moving frame, thereby measuring and obtaining the diameter change and the external dimensions of the roller.

2. The double-projection imaging type roller measurement mechanism according to claim 1, characterized in that, A fixed seat is provided at one end of the measurement platform, and a driver is installed at the fixed seat. The driver is connected to one end of the roller, and the driver drives the roller to rotate at a constant speed, so that the measurement system receives double projection images to obtain the roundness of the roller.

3. The dual-projection image type roller measuring mechanism according to claim 2, wherein, A rotary joint is installed at the other end of the measurement platform. The rotary joint is connected to one end of the roller by a pipeline joint, and a heating fluid is injected into the roller through the pipeline joint, thereby simulating the working temperature of the roller.

4. The double-projection image type roller measuring mechanism according to claim 2, wherein, A connecting component is installed between the roller and the driver, and the connecting component includes two universal joints and a telescopic rod.

5. The double-projection image type roller measuring mechanism according to claim 1, wherein Both the first rod and the second rod are locked to the bottom plate by an adjustment seat. The adjustment seat is provided with a plurality of oval holes, and the bottom plate is provided with a plurality of screw holes. The adjustment seat is locked to any of the screw holes by a plurality of bolts passing through the oval holes, thereby adjusting the distance between the first rod and the second rod.

6. The dual-projection image type roller measuring mechanism according to claim 5, wherein, A support member is locked to the end of both the first rod and the second rod away from the bottom plate, and the cross bar is locked to the support member.

7. The dual-projection image type roller measuring mechanism according to claim 1, wherein A fine adjustment device is installed above the body of the measurement platform. The fine adjustment device includes a fixing plate and a displacement plate. The fixing plate is fixed to the body, and the displacement plate is placed on the fixing plate. Further, a pivot seat is provided at both ends of the roller and is fixed to the displacement plate by the pivot seat. A block is protruded at both ends of the fixing plate, and a translation screw is penetrated and locked through the block. The end of the translation screw presses against the outside of the displacement plate. By fine adjustment of the two translation screws, the pivot seat adjusts the horizontal position. Further, at least one strip hole is opened on both sides of the pivot seat of the displacement plate, and a fixing screw is penetrated through the strip hole and locked to the fixing plate. When the fixing screw is tightened, the displacement plate is fixed.

8. The double-projection image type roller measuring mechanism according to claim 7, characterized in that, A plurality of height-adjusting screws are locked to the upper surface of the displacement plate, and the ends of the height-adjusting screws press against the fixing plate. By screwing in the height-adjusting screws, the height position of the pivot seat is adjusted. Moreover, a positioning nut is screwed onto the height-adjusting screw.

9. The dual-projection image type roller measuring mechanism according to claim 1, wherein A length scale is fixed on the horizontal tabletop of the measurement platform, and an indicating needle is fixed at the bottom plate of the moving frame. The indicating needle points to the length scale to represent the manually displaced distance of the moving frame.

10. The dual-projection imaging type roller measuring mechanism according to claim 1, wherein At least one rack is fixed on the horizontal tabletop of the measurement platform, and at least one motor is fixed at the bottom plate of the moving frame. The motor meshes with the rack to drive the moving frame to form an automatic displacement.

Images