A feeder to prevent conveyor belt deviation

Abstract

This utility model discloses a feeder for preventing belt deviation, including a frame, a loading shaft, a guide shaft, a stripping plate, and a receiving plate. The frame has a vertically downward reference plate. The loading shaft, guide shaft, stripping plate, and receiving plate are sequentially and vertically mounted on the reference plate along the feeding direction. Below the guide shaft, the reference plate also has a take-up shaft and an auxiliary roller mounted perpendicular to the reference plate. The loading shaft has first limiting members at both ends forming a first clamping space, the guide shaft has second limiting members at both ends forming a second clamping space, and the auxiliary roller has third limiting members at both ends forming a third clamping space. The upper surface of the stripping plate has fourth limiting members on both sides away from the feeding direction, forming a fourth clamping space. The size of each clamping space is consistent with the width of the feeding belt. The limiting members furthest from the reference plate among the first, second, third, and fourth limiting members are all aligned on the same straight line towards their corresponding clamping spaces. This utility model's technical solution can prevent belt deviation and tilting.

Description

Technical Field

[0001] This utility model relates to the field of material feeding, and in particular to a feeder that prevents material conveyor belt from deviating. Background Technology

[0002] As a key mechanical device, the feeder is mainly used to achieve continuous and controllable conveying of bulk materials. It can be found in many industrial fields, such as chemical, food, pharmaceutical and electronics manufacturing, and plays an indispensable role in applications such as pneumatic conveying, packaging feeding and automated production lines.

[0003] In existing technologies, roll feeders generally include a frame, a loading shaft, a guide shaft, a stripping plate, a receiving plate, and a take-up shaft. During operation, the feeder uses the rotation of the rotor to smoothly convey material from the loading shaft to the stripping plate for separating the substrate from the product, and finally delivers it to the receiving plate for removal and use, thus meeting the material conveying needs of different production stages. However, existing roll feeders often experience belt misalignment during feeding, causing the belt to lift and affecting feeding efficiency and product quality. Utility Model Content

[0004] The main purpose of this invention is to provide a feeder that prevents the conveyor belt from deviating, thereby solving existing technical problems.

[0005] To achieve the above objectives, this utility model proposes a feeder for preventing material belt deviation, comprising a feeder body, which includes a frame, a loading shaft, a guide shaft, a stripping plate, and a receiving plate. The frame is provided with a vertically downward reference plate. The loading shaft, guide shaft, stripping plate, and receiving plate are sequentially and vertically mounted on the reference plate along the feeding direction. The reference plate is further provided with a take-up shaft and multiple auxiliary rollers for assisting in take-up below the guide shaft. The take-up shaft and the auxiliary rollers are both vertically arranged perpendicular to the reference plate. The loading shaft has first limiters at both ends. The first clamping space is formed by the first clamping component, the second clamping space is formed by the second limiting component at both ends of the guide shaft, the third clamping space is formed by the third limiting component at both ends of the auxiliary roller, and the fourth clamping space is formed by the fourth limiting component on both sides of the upper surface of the stripping plate away from the feeding direction. The size of the first clamping space, the second clamping space, the third clamping space and the fourth clamping space are set to be consistent with the width of the feeding strip. The side of each of the first limiting component, the second limiting component, the third limiting component and the fourth limiting component away from the reference plate facing its corresponding clamping space is on the same straight line.

[0006] Preferably, the first limiting member, the second limiting member, and the third limiting member are all limiting rings, and the limiting rings are respectively sleeved on both ends of the first limiting member, both ends of the second limiting member, and both ends of the third limiting member and fixed by bolts.

[0007] Preferably, the fourth limiting member is a limiting strip, which is installed on both sides of the stripping plate away from the feeding direction and is set parallel to the reference plate.

[0008] Preferably, the upper end of the stripping plate is provided with scales on both sides, avoiding the limiting strip, and the scales on both sides of the stripping plate are arranged parallel to each other, with the scale bars of the scales being parallel to the reference plate.

[0009] Preferably, the limiting strip is provided with a pressure plate for pressing the material strip at one end near the fourth clamping space, and the pressure plate is rotatably connected to the limiting member so that the pressure plate rotates up and down relative to the upper surface of the stripping plate.

[0010] Preferably, a vertically downward support plate is fixedly connected to one end of the stripping plate near the reference plate, and a transverse groove is provided on one end of the support plate near the reference plate. The reference plate is provided with a transverse guide rail corresponding to the transverse groove, and the transverse guide rail is embedded in the transverse groove.

[0011] Preferably, one side of the frame is provided with a universal laser calibration mechanism for calibrating the first limiting member, the second limiting member, the third limiting member and the fourth limiting member.

[0012] Preferably, the omnidirectional laser calibration mechanism includes a first rotating component, a second rotating component, and a third rotating component. The first rotating component has a rotating shaft at its rotating end. The second rotating component is rotatably connected to the rotating shaft at the end away from the first rotating component. The third rotating component has a swing arm at the end away from the third component and is slidably connected to the rotating end of the second rotating component. The third rotating component is equipped with a laser.

[0013] The technical solution of this utility model has the following beneficial effects: By vertically mounting the loading shaft, guide shaft, stripping plate, bearing plate, receiving shaft, and auxiliary rollers on the same reference plate, the loading shaft, guide shaft, stripping plate, bearing plate, receiving shaft, and auxiliary rollers are made parallel to each other. By setting the clamping space between the first, second, third, and fourth limiting members to be consistent, and ensuring that the side of each first, second, third, and fourth limiting member away from the reference plate facing its corresponding clamping space is on the same straight line, the limiting size of the material strip is strictly consistent, and the feeding path is kept parallel to the reference plate, thereby preventing the material strip from deviating, causing the material strip to lift and resulting in product detachment or even damage to product quality. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of a feeder for preventing material belt deviation according to an embodiment of the present invention. Figure 1 ;

[0016] Figure 2 This is a partial enlarged view of part A of a feeder for preventing material belt deviation according to an embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the universal laser calibration mechanism of a feeder for preventing material belt deviation according to an embodiment of the present invention.

[0018] Figure 4 This is an exploded view of the universal laser calibration mechanism of a feeder for preventing material belt deviation, according to an embodiment of the present invention.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0020] Reference numerals in the attached figures: 1. Frame; 2. Base plate; 3. Loading shaft; 4. Guide shaft; 5. Stripping plate; 6. Support plate; 7. Receiving shaft; 8. Auxiliary roller; 9. Universal laser calibration mechanism; 31. First limiting component; 41. Second limiting component; 51. Fourth limiting component; 81. Third limiting component; 91. First rotating assembly; 92. Rotating shaft; 93. Second rotating assembly; 94. Swing rod; 95. Third rotating assembly; 96. Laser; 911. Rotating seat; 912. Rotating block; 913. Rotating groove; 931. Rotating block; 932. Fixed block; 933. Through groove; 934. Rotating column; 951. Mounting block; 961. Rotating shaft. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0023] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0024] This utility model proposes a feeder to prevent material belt from running off-track.

[0025] like Figures 1 to 2 As shown in one embodiment of this utility model, a feeder for preventing belt deviation includes a feeder body, which includes a frame 1, a loading shaft 3, a guide shaft 4, a stripping plate 5, and a supporting plate 6. The frame 1 is provided with a vertically downward reference plate 2. The loading shaft 3, guide shaft 4, stripping plate 5, and supporting plate 6 are sequentially and vertically installed on the reference plate 2 along the feeding direction. Below the guide shaft 4, the reference plate 2 is also provided with a take-up shaft 7 and multiple auxiliary rollers 8 for assisting in take-up. The take-up shaft 7 and auxiliary rollers 8 are both vertically arranged perpendicular to the reference plate 2, so that the reference plate 2, loading shaft 3, guide shaft 4, stripping plate 5, supporting plate 6, take-up shaft 7, and auxiliary rollers 8 are parallel to each other, preventing the belt from tilting. The loading shaft 3 is provided with first limiting members 31 at both ends to form a first clamping space, the guide shaft 4 is provided with second limiting members 41 at both ends to form a second clamping space, and the auxiliary rollers 8 are provided with third limiting members at both ends. The positioning member 81 forms a third clamping space, and the upper end face of the stripping plate 5 is provided with a fourth limiting member 51 on both sides away from the feeding direction to form a fourth clamping space. The size of the first clamping space, the second clamping space, the third clamping space, and the fourth clamping space are all consistent with the width of the feeding strip. The side of each first limiting member 31, second limiting member 41, third limiting member 81, and fourth limiting member 51 away from the reference plate 2 facing its corresponding clamping space is on the same straight line, thereby ensuring that the distance between each clamping space and the reference plate 2 is consistent, so that the strip remains parallel to the reference plate 2 at each position during the conveying process. Since the force on the strip from the receiving shaft 7 is unidirectional, if the position of one of the limiting members deviates, it will cause the strip to run off-center and lift up. The four sets of clamping spaces form a continuous lateral constraint, and the strip is restricted to the same alignment plane throughout the entire process from the loading shaft 3 to the stripping plate 5, and the lateral deviation is eliminated step by step.

[0026] The loading shaft 3, the guide shaft 4, the stripping plate 5, and the bearing plate 6 can be installed on the same horizontal line or not; the take-up shaft 7 and the auxiliary roller 8 are installed below the guide shaft 4; several mounting slots are opened on the reference plate 2, and the loading shaft 3, guide shaft 4, stripping plate 5, bearing plate 6, take-up shaft 7, and auxiliary roller 8 are all vertically inserted into and abut against the reference plate 2, and the mounting slots restrict the loading shaft 3, guide shaft 4, stripping plate 5, bearing plate 6, take-up shaft 7, and auxiliary roller 8 to remain perpendicular to the reference plate 2; the take-up shaft 7 is connected to a motor, and rotating the take-up shaft 7 drives the material belt to move; the first limiting member 31 is a pair of discs with a diameter larger than the diameter of the roll material, which are sleeved on both ends of the loading shaft 3, allowing the material to move through the rollers. The first limiting member 31 is fixed with bolts; the second limiting member 41 and the third limiting member 81 are open rings that are tightened with bolts; the fourth limiting member 51 is a limiting plate, or it can be composed of multiple limiting blocks, which is not limited here; the positions of the auxiliary roller 8 and the take-up shaft 7 are not limited; the installation position of each limiting member can be measured and installed one by one with calipers, or it can be installed with the help of other auxiliary means; one of the loading processes is as follows: the material roll is installed on the loading shaft 3 and the first limiting member 31 is fixed, the material strip is pulled out from the roll, passes around the guide shaft 4 and is pulled up to the stripping plate 5, inserted into the gap between the stripping plate 5 and the support plate 6 and pulled down to the bottom of the auxiliary roller 8, and then pulled up to the take-up shaft 7 and fixed; the distance between the stripping plate 5 and the support plate 6 is adjustable to adapt to material strips of different thicknesses.

[0027] Furthermore, this embodiment provides a feeder for preventing material belt deviation, comprising: a frame 1 made of high-strength aluminum alloy, with a vertically downward reference plate 2 at its front end, which serves as the mounting reference for all components to ensure a verticality error ≤0.1mm; a loading shaft 3, which is vertically fixed to the left end of the reference plate 2 via a bearing seat, and has a hard chrome plated surface to reduce friction; a take-up shaft 7, installed below the guide shaft 4, driven by a stepper motor to achieve material belt winding; a guide shaft 4, located to the right of the loading shaft 3; and a stripping plate 5, made of stainless steel, installed in the middle of the reference plate 2. The stripper plate 5 has a 45° angled stripping blade at its front end for peeling off the protective film from the strip. The support plate 6, located at the right end of the reference plate 2, is close to the stripper plate 5 and has a polytetrafluoroethylene coating to prevent the strip from adhering. The first limiting member 31 is installed at both ends of the loading shaft 3 and is an adjustable limiting ring, fixed to the shaft with bolts to form a first clamping space with a width consistent with the strip width. The second limiting member 41 is installed at both ends of the guide shaft 4, with the same structure as the first limiting member 31 and the same clamping space width. The third limiting member 81 is installed at both ends of the auxiliary roller 8 and is a ring-shaped limiting ring. The limiting rings at both ends are quickly adjusted by spring clips to accommodate different strip widths. The fourth limiting member 51 is installed on both sides of the stripper plate 5, and the limiting strip is fixed to the upper surface of the stripper plate 5 with screws, aligned with the upstream limiting mechanism. The inner edges of all limiting members away from the reference plate 2 are fixed after laser calibration to form a straight line parallel to the reference plate 2, forcing the strip to have no lateral deviation from loading to stripping.

[0028] Optionally, a laser displacement sensor is installed on the reference plate 2 to monitor the edge position of the material belt in real time. The sensor data is fed back to the control system to dynamically adjust the extension and retraction of the loading shaft 3, guide shaft 4, stripping plate 5, and auxiliary roller 8 to compensate for the offset of the material belt.

[0029] Preferably, the first limiting member 31, the second limiting member 41 and the third limiting member 81 are all limiting rings. The limiting rings are respectively sleeved on both ends of the first limiting member 31, both ends of the second limiting member 41 and both ends of the third limiting member 81 and fixed by bolts. The position of the limiting rings can be adjusted to adapt to different sizes of material strip widths.

[0030] Furthermore, the limiting ring consists of two 120° arc-shaped blocks connected by a hinge. When closed, it is secured by a latch with a spring pin. The opening angle can reach 150°, which facilitates quick loading and unloading of material rolls and is particularly suitable for scenarios where material rolls need to be changed frequently.

[0031] Preferably, such as Figure 2 As shown, the fourth limiting member 51 is a limiting strip. The limiting strip is installed on both sides of the stripping plate 5 away from the feeding direction and is set parallel to the reference plate 2 to ensure that the material strip has no lateral deviation.

[0032] Preferably, such as Figure 2As shown, the upper end of the stripping plate 5 is provided with scales on both sides, avoiding the limiting strip. The scales on both sides of the stripping plate 5 are set parallel to each other. The scale bars are parallel to the reference plate 2. By adjusting the limiting strip through the scales, the limiting strip can be quickly adjusted to use material strips of different widths, and the limiting strip can be kept parallel to the reference plate 2.

[0033] Furthermore, a laser-etched scale line is provided on each side of the stripping plate 5, with a scale interval of 0.5mm and an accuracy of ±0.02mm.

[0034] Preferably, a pressure plate for pressing the material strip is provided at one end of the limiting strip near the fourth clamping space. The pressure plate is rotatably connected to the limiting member so that the pressure plate rotates up and down relative to the upper surface of the stripping plate 5.

[0035] Preferably, such as Figure 2 As shown, a vertically downward support plate is fixedly connected to one end of the stripping plate 5 near the reference plate 2. The support plate has a transverse groove at one end near the reference plate 2. The reference plate 2 has a transverse guide rail corresponding to the transverse groove. The transverse guide rail is embedded in the transverse groove to facilitate the installation of the material strip. When installing the material strip, the stripping plate 5 is pushed away from the support plate 6 so that the material strip can be inserted. The transverse groove and the transverse guide rail are both set horizontally to ensure that the stripping plate 5 and the reference plate 2 remain perpendicular.

[0036] Preferably, a universal laser calibration mechanism 9 is provided on one side of the frame 1 for calibrating the first limiting member 31, the second limiting member 41, the third limiting member 81 and the fourth limiting member 51. The universal laser calibration mechanism 9 is used to calibrate each limiting member, which is convenient and quick.

[0037] The omnidirectional laser calibration mechanism 9 can be composed of multiple nested spheres and sleeves connected one by one. The laser 96 is installed at the end, and the laser 96 can be moved in all directions by twisting the sleeve. Its structure can also be composed of omnidirectional bending and shaping hoses.

[0038] Preferably, such as Figure 3As shown, the omnidirectional laser calibration mechanism 9 includes a first rotating component 91, a second rotating component 93, and a third rotating component 95. The first rotating component 91 has a rotating shaft 92 at its rotating end. The second rotating component 93 is rotatably connected to the end of the rotating shaft 92 away from the first rotating component 91. The third rotating component 95 has a swing arm 94, the end of which is slidably connected to the rotating end of the second rotating component 93. A laser 96 is mounted on the third rotating component 95. The laser 96 can be rotated into the frame 1 by the first rotating component 91 to accommodate the limiting components and fiber strips installed at different positions on the frame 1. The second rotating component 93 can adjust the vertical position of the laser 96, while the swing arm 94, which is slidably connected to the second rotating component 93, can adjust the length of the swing arm, making the adjustment of the laser 96 more flexible. The third rotation can adjust the laser 96 to a horizontal position for easy calibration. The calibration process involves several steps: horizontal calibration by rotating the first component to align the laser beam with the limiting ring of the receiving shaft 77; length adjustment by sliding the swing arm 94 to accommodate different shaft spacings; and vertical calibration by rotating the third component to adjust the laser beam elevation angle and align it with the limiting ring of the auxiliary roller 8. When the auxiliary roller 8 requires calibration due to differences in installation height, the laser beam is precisely projected to the target position through three-degree-of-freedom adjustment.

[0039] Optionally, the first rotating component 91 is driven by a harmonic reducer, with a rotation angle of 0-350°; the second component is connected by a universal joint, with a pitch angle adjustable by ±45°; the swing arm 94 has a length adjustment range of 300-600mm; and the laser 96 is a Class 2 red dot laser with an adjustable focal length.

[0040] In this embodiment, the universal laser calibration mechanism 9 allows the laser beam to move to various positions, providing a reference line for the parts that need to be calibrated. This enables quick adjustment of the adjustable limiters and adjustable limit strips, making it simple and convenient. It ensures that each part that needs to be calibrated is aligned one by one, preventing the material from warping or slipping due to misalignment, which would affect the quality of the material supply.

[0041] Optionally, the first component is a worm gear mechanism equipped with an angle scale; the second component is connected by a ball joint to achieve omnidirectional free swing; the swing arm 94 has a multi-section folding structure, which forms a Z-shaped support when unfolded; and the laser 96 integrates an angle sensor.

[0042] Preferably, as shown in 4, the first rotating component 91 is provided with a rotating seat 911, and the bottom of the rotating shaft 92 is provided with a rotating block 912. The rotating block 912 is embedded in the rotating seat 911 and rotatably connected to the rotating seat 911.

[0043] Furthermore, the rotating seat 911 of the first rotating component 91 is an annular base with embedded ball bearings; the rotating block 912 is a cylinder with a flange at the bottom that engages with the ball bearings; the rotating shaft 92 is vertically welded to the top of the rotating block 912, and drives the laser 96 to rotate horizontally when rotating.

[0044] Preferably, as shown in 4, the second rotating component 93 includes a rotating block 931 and a fixed block 932 fixedly connected to one end of the rotating block 931. The rotating block 931 has a rotating column 934 at the end away from the fixed block 932. The rotating shaft 92 has a rotating groove 913 at the end away from the first rotating component 91. The rotating column 934 is embedded in the rotating groove 913 and is rotatably hinged to the rotating shaft 92. The fixed block 932 has a through groove 933 on one side. The swing rod 94 is inserted into the through groove 933 and movably connected to the fixed block 932. The fixed block 932 also has a locking member on one side for fixing the swing rod 94.

[0045] Furthermore, the rotating block 931 and the fixed block 932 of the second rotating assembly 93 are fixed by welding. The end of the rotating column 934 is provided with a ball head, which is ball-jointed to the rotating groove 913 of the rotating shaft 92, allowing the swing arm 94 to swing at multiple angles. The swing arm 94 is a telescopic rod structure with a length adjustment range of 200-500mm to adapt to different sizes of the frame 1. When the frame 1 is widened, the swing arm 94 is lengthened and locked to ensure that the laser 96 can still cover the far-end limiting component.

[0046] Preferably, as shown in 4, the third rotating component 95 includes a mounting block 951 and a rotating shaft 961. One end of the mounting block 951 is fixedly connected to the end of the swing arm 94 away from the second rotating component 93. A mounting groove is provided on one side of the mounting block 951. The rotating shaft 961 is embedded in the mounting groove. The laser 96 is fixedly connected to the end of the rotating shaft 961 away from the bottom of the mounting groove.

[0047] Furthermore, the mounting block 951 of the third rotating component 95 is a U-shaped bracket, and the rotating shaft 961 is hinged to the mounting groove by a pin, allowing the laser 96 to swing up and down.

[0048] Optionally, a level is installed on one side of the laser 96 to facilitate leveling the laser beam.

[0049] Specifically, the working principle and usage process of this utility model are as follows: By vertically mounting the loading shaft 3, guide shaft 4, stripping plate 5, supporting plate 6, receiving shaft 7, and auxiliary roller 8 onto the same reference plate 2, the loading shaft 3, guide shaft 4, stripping plate 5, supporting plate 6, receiving shaft 7, and auxiliary roller 8 are made parallel to each other. By setting the clamping space size between the first limiting member 31, second limiting member 41, third limiting member 81, and fourth limiting member 51 to be consistent, and ensuring that the side of each of the first limiting member 31, second limiting member 41, third limiting member 81, and fourth limiting member 51 away from the reference plate 2 facing its corresponding clamping space is on the same straight line, the limiting size of the material strip is strictly consistent, and the feeding path is kept parallel to the reference plate 2, thereby preventing the material strip from deviating, causing the material strip to lift up and resulting in product detachment or even damage to product quality.

[0050] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A feeder for preventing conveyor belt deviation, comprising a feeder body, characterized in that, The feeder body includes a frame (1), a loading shaft (3), a guide shaft (4), a stripping plate (5), and a receiving plate (6). The frame (1) is provided with a vertically downward reference plate (2). The loading shaft (3), guide shaft (4), stripping plate (5), and receiving plate (6) are sequentially and vertically installed on the reference plate (2) along the feeding direction. The reference plate (2) is also provided with a receiving shaft (7) and a plurality of auxiliary rollers (8) for assisting in receiving materials below the guide shaft (4). The receiving shaft (7) and the auxiliary rollers (8) are both vertically arranged perpendicular to the reference plate (2). The loading shaft (3) is provided with first limiting members (31) at both ends to form a first clamp. The guide shaft (4) has a second limiting member (41) at both ends to form a second clamping space, the auxiliary roller (8) has a third limiting member (81) at both ends to form a third clamping space, and the stripping plate (5) has a fourth limiting member (51) on both sides of the upper end surface away from the feeding direction to form a fourth clamping space. The size of the first clamping space, the second clamping space, the third clamping space and the fourth clamping space are set in the same way as the width of the feeding strip. Each first limiting member (31), second limiting member (41), third limiting member (81) and fourth limiting member (51) away from the reference plate (2) are on the same straight line on the side facing their corresponding clamping space.

2. The feeder for preventing material belt deviation according to claim 1, characterized in that, The first limiting member (31), the second limiting member (41) and the third limiting member (81) are all limiting rings. The limiting rings are respectively sleeved on both ends of the first limiting member (31), both ends of the second limiting member (41) and both ends of the third limiting member (81) and fixed by bolts.

3. The feeder for preventing material belt deviation according to claim 1, characterized in that, The fourth limiting member (51) is a limiting strip, which is installed on both sides of the stripping plate (5) away from the feeding direction and is set parallel to the reference plate (2).

4. A feeder for preventing material belt deviation according to claim 3, characterized in that, The upper end of the stripping plate (5) is provided with scales on both sides, avoiding the limiting strip. The scales on both sides of the stripping plate (5) are arranged parallel to each other, and the scale bars are parallel to the reference plate (2).

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