Adhesive tape adhesion testing device

Abstract

The present invention belongs to the technical field of adhesion detection, and specifically relates to a tape adhesion detection device, comprising a base and a rotating frame rotatably arranged on the base, the base being connected to a detection plate group by rotating the rotating frame, the detection plate group being slidably provided with an assisting plate, sliding frames being fixedly arranged on both sides of the assisting plate, and ball collecting plates being arranged on the detection plate group; this tape adhesion detection device drives the sliding frame to move by the assisting plate, and cooperates with the rotating rod, pressure rod and other components in the pulling mechanism, which can automatically flatten and firmly fix the tape, and clearly defines the assisting area where the assisting plate is located after the tape is fixed and the detection area where the detection plate is located, so as to avoid the need for the detection personnel to repeatedly determine the position of the assisting area when fixing the tape, and directly presses and fixes one end of the tape by the pressure plate, and the elastic contact and flattening design of the pressure rod and the tape in the pulling mechanism, thereby avoiding the operation of using auxiliary tape to fix the tape to be tested on the detection equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of adhesion detection, and particularly relates to a device for detecting the adhesion of an adhesive tape. Background Art

[0002] The initial tack test device for adhesive tapes is an instrument used to evaluate the initial adhesive properties of adhesive tapes. Its core principle is based on the rolling ball method. By simulating the adhesive performance of the tape when it first contacts the adherend in actual use, it provides key data support for the quality control of adhesive tape products. The device mainly consists of an inclined plate, a steel ball release mechanism, a steel ball collection trough, and an angle adjustment component. During the test, the tape sample is fixed flat on the surface of the inclined plate, ensuring that the adhesive side of the tape faces upward and is free of bubbles and wrinkles. Then, a standard steel ball of corresponding specifications is selected according to the type of tape and freely released from a designated position on the top of the inclined plate. Under the action of gravity, the steel ball rolls along the surface of the inclined plate. The initial tack of the tape creates resistance to the steel ball, and the steel ball eventually stops after rolling a certain distance on the tape surface. By measuring the distance the steel ball rolls or observing its stopping position, the strength of the tape's initial tack can be determined.

[0003] Traditional testing methods often require the use of auxiliary tape to secure the tape to be tested to the equipment. Repeated adjustments are required to ensure the tape is flat, resulting in low fixing efficiency. Wrinkles and bubbles in the tape often affect the accuracy of test results. Furthermore, this makes it easy for the auxiliary tape to remain on the equipment surface, making it difficult to ensure the cleanliness of the test area, which in turn interferes with subsequent testing and affects the reliability of test data. Summary of the Invention

[0004] The purpose of the present invention is to provide a tape adhesion testing device for quickly and evenly fixing the tape to be tested in order to solve the above problems.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] A device for detecting the adhesion of an adhesive tape comprises a base and a rotating frame rotatably arranged on the base, wherein the base is rotatably connected to a detection plate group via the rotating frame, a power-assisting plate is slidably arranged on the detection plate group, sliding frames are fixedly arranged on both sides of the power-assisting plate, and a ball collecting plate is provided on the detection plate group;

[0007] Also included are:

[0008] A pressing plate, the pressing plate is flipped and arranged on the detection plate group;

[0009] A pulling mechanism, the pulling mechanism being arranged on the sliding frame and comprising a rotating rod, which is driven to move by the sliding frame moving on the detection plate assembly;

[0010] L-shaped plates are arranged on both sides of the ball collecting plate.

[0011] As a further optimization scheme of the present invention, the detection plate group includes a mounting plate, the mounting plate is fixedly set on the rotating frame, the detection plate is fixedly set on the upper surface of the mounting plate, a groove is provided on the mounting plate, the groove is located on one side of the detection plate, a protrusion is provided on the lower surface of the mounting plate, track grooves are provided on both sides of the protrusion, and the track grooves include oblique grooves and transverse grooves.

[0012] As a further optimization scheme of the present invention, the pulling mechanism also includes an L-shaped rod, which is slidably arranged on the sliding frame, and a horizontal axis is rotatably arranged on the L-shaped rod, and the rotating rod is fixedly connected to the horizontal axis. The rotating rod is rotatably connected to the L-shaped rod through the horizontal axis, and gears are fixedly arranged at both ends of the horizontal axis. A roller is rotatably arranged at one end of the L-shaped rod away from the rotating rod, and the roller is slidably arranged in the track groove, and an embedding groove is provided on the rotating rod, and a pressure rod is slidably arranged in the embedding groove, and a plurality of accommodating grooves are provided on the pressure rod, and a spring is provided in the accommodating groove, and the two ends of the spring are respectively connected to the accommodating groove and the embedding groove.

[0013] As a further optimization scheme of the present invention, guard plates are fixedly installed on both sides of the inner surface of the ball collecting plate, avoidance grooves are opened on the guard plates, the L-shaped rod passes through the guard plates through the avoidance grooves, and baffles are fixedly installed on the ball collecting plate, and the baffles are slidably set on the mounting plate.

[0014] As a further optimization scheme of the present invention, the L-shaped plate is fixedly arranged on both sides of the avoidance groove, a sliding groove is opened on the L-shaped plate, the horizontal axis is slidably arranged in the sliding groove, a rack is arranged on the L-shaped plate, and the gear is engaged with the rack.

[0015] As a further optimization scheme of the present invention, a crossbeam is provided on the power-assisting plate, and the crossbeam is fixedly connected to the sliding frame. A ruler is provided on one of the sliding frames, and a through hole is opened on the sliding frame. The L-shaped rod is slidably arranged in the through hole, and a ball blocking mechanism is provided on the power-assisting plate.

[0016] As a further optimization solution of the present invention, the ball blocking mechanism includes a C-shaped frame, the C-shaped frame is fixedly arranged on the power-assisting plate, and a blocking rod is rotatably arranged on the C-shaped frame.

[0017] As a further optimization solution of the present invention, the pressure plate is arranged in the groove, a pressure plate shaft is fixedly arranged on the pressure plate, and the pressure plate is rotatably arranged in the groove through the pressure plate shaft.

[0018] As a further optimization solution of the present invention, the rotating frames are provided with two and are symmetrically arranged on the lower surface of the mounting plate. A cross bar is fixedly provided through the rotating frames, and a pointer is fixedly provided on the cross bar.

[0019] As a further optimization solution of the present invention, the cross bar is rotatably arranged on the stand, the stand is fixedly mounted on the base, and a dial is provided on the stand.

[0020] The beneficial effects of the present invention are:

[0021] 1. Unlike existing technologies, in actual use, the power-assisted plate drives the sliding frame, which, in conjunction with the rotating rod and pressure rod in the pulling mechanism, automatically flattens and secures the tape. As the power-assisted plate moves, the L-shaped rod drives the rotating rod downward and flips, while the pressure rod adheres to the tape and moves laterally, quickly achieving a flat and secure tape. This eliminates the need for manual adjustments and significantly improves securing efficiency and accuracy.

[0022] 2. Different from the existing technology, in actual use, the power-assisting area where the power-assisting plate is located after the tape is fixed and the detection area where the detection plate is located are clearly defined, so as to avoid the need for the detection personnel to repeatedly determine the position of the power-assisting area when fixing the tape.

[0023] 3. Unlike existing technologies, the pressure plate directly secures one end of the tape, while the pull mechanism's elastic contact and leveling design eliminates the need for auxiliary tape to secure the tape to the test equipment. This effectively reduces residual adhesive between the assist and test areas, resulting from residual auxiliary tape, and ensures the cleanliness of the test area. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the connection structure of the detection board group of the present invention;

[0026] Figure 3 This invention Figure 2 A in the middle is an enlarged structural diagram;

[0027] Figure 4 This invention Figure 2 Another perspective structural diagram;

[0028] Figure 5 This invention Figure 2 Schematic diagram of explosion structure;

[0029] Figure 6 This invention Figure 5 The enlarged structural diagram at B in the middle;

[0030] Figure 7 This is a schematic diagram of the cross-sectional structure of the rotating rod of the present invention;

[0031] Figure 8 It is a structural schematic diagram of the ball collecting plate of the present invention.

[0032] In the figure: 1, base; 11, stand; 12, rotating frame; 121, crossbar; 122, pointer; 13, dial; 2, power plate; 21, crossbeam; 3, pressure plate; 31, pressure plate shaft; 4, detection plate group; 41, mounting plate; 42, detection plate; 43, groove; 44, protrusion; 441, track groove; 441a, oblique groove; 441b, horizontal groove; 5, sliding frame; 51, ruler; 52, Through hole; 6. Ball blocking mechanism; 61. C-shaped frame; 62. Blocking rod; 7. Ball collecting plate; 71. Guard plate; 711. Avoidance groove; 72. Baffle; 8. Pulling mechanism; 81. Rotating rod; 811. Horizontal axis; 812. Gear; 813. Embedding groove; 82. L-shaped rod; 83. Pressing rod; 831. Accommodating groove; 832. Spring; 84. Roller; 9. L-shaped plate; 91. Slide groove; 92. Rack. DETAILED DESCRIPTION

[0033] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0034] Example: Figure 1 - Figure 8As shown, a tape adhesion detection device includes a base 1 and a rotating frame 12, the rotating frame 12 is provided with two, a cross bar 121 is fixedly provided on the rotating frame 12, a pointer 122 is fixedly provided on the cross bar 121, the cross bar 121 is rotatably provided on the vertical frame 11 through a damping bearing, the vertical frame 11 is fixedly installed on the base 1, and a dial 13 is provided on the vertical frame 11. The base 1 is rotatably connected to the detection plate group 4 through the rotating frame 12, and a power-assisting plate 2 is slidably provided on the detection plate group 4. Sliding frames 5 are fixedly provided on both sides of the power-assisting plate 2, and a cross beam 21 is fixedly provided on the power-assisting plate 2. The cross beam 21 is fixedly connected to the sliding frame 5, and a scale 51 is provided on one of the sliding frames 5. A ball blocking mechanism 6 is provided on the power assisting plate 2, and the ball blocking mechanism 6 includes a C-shaped frame 61, which is fixedly provided on the power assisting plate 2, and a blocking rod 62 is rotatably provided on the C-shaped frame 61. A ball collecting plate 7 is provided on the detection plate group 4, and the symmetrically arranged rotating frame 12 cooperates with the cross bar 121 to stably support the detection plate group 4 to ensure a smooth rotation process; the cooperation between the pointer 122 and the dial 13 can accurately display the inclination angle of the detection plate group 4, which is convenient for controlling the consistency of the detection conditions; the crossbeam 21 enhances the connection strength between the power assisting plate 2 and the sliding frame 5, the ruler 51 can intuitively observe the moving distance of the steel ball, the blocking rod 62 controls the release of the steel ball, and the standard steel ball of corresponding specifications is selected according to the type of tape. The steel ball is freely released from the C-shaped frame 61. Under the action of gravity, the steel ball rolls along the surface of the inclined detection plate group 4. The initial adhesion of the tape will produce resistance to the steel ball. Finally, the steel ball stops after rolling a certain distance on the tape surface. The initial adhesion of the tape is tested by measuring the rolling distance of the steel ball or observing its stopping position.

[0035] like Figure 5 As shown, the detection plate group 4 includes a mounting plate 41, and two rotating frames 12 are symmetrically arranged on the lower surface of the mounting plate 41. The mounting plates 41 are slidably installed in the sliding frame 5 on both sides. A detection plate 42 is fixedly arranged on the upper surface of the mounting plate 41, and a groove 43 is opened on the mounting plate 41. The groove 43 is located on one side of the detection plate 42. A protrusion 44 is set on the lower surface of the mounting plate 41, and a track groove 441 is opened on both sides of the protrusion 44. The track groove 441 includes an oblique groove 441a and a transverse groove 441b. A pressure plate 3 is rotatably arranged in the groove 43, and a pressure plate shaft 31 is fixed on the pressure plate 3. The pressure plate 3 is rotatably arranged in the groove 43 by the pressure plate shaft 31. The mounting plate 41 provides an installation basis for the entire detection plate group 4. The detection plate 42 serves as the bearing surface of the tape, and its flat surface can reduce the generation of tape wrinkles; the cooperation of the groove 43 and the pressure plate 3 can stably position the end of the tape, and the pressure plate shaft 31 makes the pressure plate 3 flip flexibly, which is convenient for quickly placing and fixing the tape.

[0036] like Figure 5 - Figure 7As shown, a pulling mechanism 8 is provided on the sliding frame 5, and the pulling mechanism 8 includes a rotating rod 81 and an L-shaped rod 82. A through hole 52 is provided on the sliding frame 5, and the L-shaped rod 82 is slidably provided in the through hole 52. A horizontal shaft 811 is rotatably provided on the L-shaped rod 82, and the rotating rod 81 is fixedly connected to the horizontal shaft 811. The rotating rod 81 is rotatably connected to the L-shaped rod 82 through the horizontal shaft 811. Gears 812 are fixedly provided at both ends of the horizontal shaft 811. A roller 84 is rotatably provided at one end of the L-shaped rod 82 away from the rotating rod 81. The roller 84 is slidably provided in the track groove 441. The track groove 441 provides a preset movement path for the roller 84 through the combination of the oblique groove 441a and the horizontal groove 441b, which can guide the pulling mechanism 8 to complete the descending and horizontal movement actions to ensure the stability of the tape flattening process. An embedded groove 813 is provided on the rotating rod 81. The embedded groove 81 3 is provided with a pressure rod 83 for sliding inside. The pressure rod 83 is provided with multiple accommodating grooves 831. Springs 832 are provided in the accommodating grooves 831. The two ends of the spring 832 are connected to the accommodating grooves 831 and the embedding grooves 813 respectively. The through hole 52 provides a stable sliding guide for the L-shaped rod 82 to prevent it from deflecting; the horizontal axis 811 not only realizes the rotation connection between the rotating rod 81 and the L-shaped rod 82, but also provides a mounting carrier for the gear 812; the friction force of the roller 84 is small when sliding in the track groove 441, which ensures the smooth movement of the L-shaped rod 82; the cooperation between the pressure rod 83 and the spring 832 forms an elastic pressing structure, which can not only closely fit the tape to achieve effective pulling, but also avoid excessive pulling and damage to the tape through the expansion and contraction of the spring 832 after the tape is flattened, thereby enhancing the adaptability of the device. At the same time, after the rotating rod 81 is horizontal, there is a distance between the rotating rods 81 for the steel ball to pass through.

[0037] like Figure 8 As shown, guard plates 71 are fixedly provided on both sides of the inner surface of the ball collecting plate 7, and avoidance grooves 711 are opened on the guard plates 71. The L-shaped rod 82 passes through the guard plates 71 through the avoidance grooves 711. A baffle 72 is fixedly provided on the ball collecting plate 7, and the baffle 72 is slidably set on the mounting plate 41; the avoidance grooves 711 provide movement space for the L-shaped rod 82 to prevent it from colliding and interfering with the guard plates 71; the baffle 72 is used to fill the gap between the ball collecting plate 7 and the mounting plate 41 to prevent steel balls from falling into it.

[0038] like Figure 2 - Figure 3As shown, an L-shaped plate 9 is fixedly provided on the guard plate 71, and the L-shaped plate 9 is fixedly provided on both sides of the avoidance groove 711. A slide groove 91 is opened on the L-shaped plate 9, and the horizontal axis 811 is slidably provided in the slide groove 91. A rack 92 is provided on the L-shaped plate 9, and the gear 812 is engaged with the rack 92. The engagement of the gear 812 and the rack 92 can convert the linear motion into rotational motion, so that the flipping angle of the rotating rod 81 can be controlled, and the angle of the rotating rod 81 is limited by the L-shaped plate 9 to prevent it from rotating laterally. The slide groove 91 guides the sliding of the horizontal axis 811 to prevent it from offsetting during the movement; the precise engagement of the gear 812 and the rack 92 can stably convert the movement of the L-shaped rod 82 into the flipping of the rotating rod 81, thereby ensuring the coordination and accuracy of the action of the pulling mechanism 8.

[0039] It should be noted that the working principle of the tape adhesion detection device is as follows: first, the inclination angle of the mounting plate 41 for detection is adjusted by rotating the mounting plate 41, and then the detection personnel pulls the C-shaped frame 61 to drive the assisting plate 2 to slide on the mounting plate 41, thereby exposing the pressure plate 3 that was originally blocked by the assisting plate 2. Subsequently, the pressure plate 3 is flipped around the pressure plate axis 31, and the end of the tape with the adhesive-free side facing down is placed flatly in the groove 43 of the detection plate 42. The pressure plate 3 is then reset, and the gravity of the pressure plate 3 and the cooperation with the groove 43 are used to initially press one end of the tape, while allowing the rest of the tape to be flat on the upper surface of the detection plate 42. Afterwards, the assisting plate 2 is pushed back. During the movement of the assisting plate 2, its side will contact and apply pressure to the pressure plate 3, pressing the pressure plate 3 tightly to ensure that one end of the tape is firmly fixed.

[0040] During the process of pushing back the assist plate 2, the assist plate 2 drives the sliding frames 5 on either side to move synchronously, which in turn drives the L-shaped rod 82 extending therethrough. The end of the L-shaped rod 82, facing away from the rotating rod 81, is rotatably provided with rollers 84. These rollers 84 follow the track grooves 441 on either side of the protrusions 44 on the lower surface of the mounting plate 41. As the rollers 84 move within the inclined grooves 441a, the inclined angle of the inclined grooves 441a forces the L-shaped rod 82 to gradually descend, thereby simultaneously driving the rotating rod 81 downward. Simultaneously, gears 812 are fixed to each end of the rotatable transverse axis 811 on the L-shaped rod 82. These gears 812 engage with the racks 92 on the L-shaped plate 9 on the ball collecting plate 7. As the L-shaped rod 82 moves, the gears 812 mesh with the racks 92, driving the transverse axis 811 to rotate, causing the rotating rod 81, which is fixed to the transverse axis 811, to flip until it is horizontal. At this time, the pressure rod 83 slidingly set in the embedded groove 813 on the rotating rod 81 will contact and adhere to the adhesive surface of the tape, and at the same time the pressure rod 83 will shrink into the embedded groove 813, compressing the spring 832 in the accommodating groove 831.

[0041] When the roller 84 moves into the transverse groove 441b of the track groove 441, the L-shaped rod 82 no longer descends, and the rotating rod 81 remains horizontal. As the sliding frame 5 continues to move, the rotating rod 81 drives the pressure rod 83 and the adhesive tape bonded thereto to move laterally, further flattening the adhesive tape and avoiding bumps or wrinkles on the adhesive tape surface. This also prevents the steel ball from rolling on the raised portion of the adhesive tape during testing, changing its trajectory and affecting the accuracy of the test. After the adhesive tape is completely flattened, the pressure rod 83 continues to move with the rotating rod 81. At this time, the spring 832 still has a certain amount of compression margin, and the pressure rod 83 does not compress the adhesive tape tightly, thereby allowing a certain relative displacement between the pressure rod 83 and the adhesive tape. In this way, the pressure rod 83 can move on the adhesive tape until the auxiliary plate 2 is completely aligned with the edge of the mounting plate 41, completing the entire adhesive tape fixing and flattening process.

[0042] Afterwards, a test steel ball is placed in the C-shaped frame 61. The steel ball will be blocked by the blocking rod 62 and remain in a stationary state. Then, the blocking rod 62 is rotated to release the blockage of the steel ball, allowing the steel ball to naturally roll along the track of the C-shaped frame 61 onto the flat tape under the action of gravity. The adhesion of the tape can be judged by observing the rolling distance of the steel ball on the tape, whether it slides, and the position when it slides.

[0043] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A device for detecting adhesive tape adhesion, comprising a base (1) and a rotating frame (12) rotatably disposed on the base (1), characterized in that: The base (1) is rotatably connected to a detection plate group (4) via a rotating frame (12); a power-assisting plate (2) is slidably provided on the detection plate group (4); sliding frames (5) are fixedly provided on both sides of the power-assisting plate (2); and a ball collecting plate (7) is provided on the detection plate group (4); Also included are: A pressing plate (3), wherein the pressing plate (3) is flipped and arranged on the detection plate group (4); A pulling mechanism (8), wherein the pulling mechanism (8) is arranged on the sliding frame (5), and the pulling mechanism (8) includes a rotating rod (81), which is moved on the detection plate group (4) by the sliding frame (5), thereby driving the rotating rod (81) to move; L-shaped plates (9), the L-shaped plates (9) being arranged on both sides of the interior of the ball collecting plate (7); The detection plate group (4) includes a mounting plate (41), the mounting plate (41) is fixedly mounted on the rotating frame (12), a detection plate (42) is fixedly mounted on the upper surface of the mounting plate (41), a groove (43) is provided on the mounting plate (41), the groove (43) is located on one side of the detection plate (42), a convex block (44) is provided on the lower surface of the mounting plate (41), and track grooves (441) are provided on both sides of the convex block (44), and the track grooves (441) include an oblique groove (441a) and a transverse groove (441b); The pulling mechanism (8) further comprises an L-shaped rod (82), the L-shaped rod (82) being slidably disposed on the sliding frame (5), a transverse axis (811) being rotatably disposed on the L-shaped rod (82), the rotating rod (81) being fixedly connected to the transverse axis (811), the rotating rod (81) being rotatably connected to the L-shaped rod (82) via the transverse axis (811), gears (812) being fixedly disposed at both ends of the transverse axis (811), the L-shaped rod (82) being away from the rotating rod (81 ) is rotatably provided with a roller (84) at one end, the roller (84) is slidably provided in the track groove (441), the rotating rod (81) is provided with an embedding groove (813), a pressure rod (83) is slidably provided in the embedding groove (813), a plurality of accommodating grooves (831) are provided on the pressure rod (83), a spring (832) is provided in the accommodating groove (831), and both ends of the spring (832) are respectively connected to the accommodating groove (831) and the embedding groove (813); A sliding groove (91) is provided on the L-shaped plate (9), and the transverse shaft (811) is slidably arranged in the sliding groove (91). A rack (92) is provided on the L-shaped plate (9), and the gear (812) engages with the rack (92).

2. The device for detecting adhesive strength of a tape according to claim 1, wherein: Guard plates (71) are fixedly provided on both sides of the inner surface of the ball collecting plate (7), and an avoidance groove (711) is provided on the guard plate (71). The L-shaped rod (82) passes through the guard plate (71) through the avoidance groove (711). A baffle (72) is fixedly provided on the ball collecting plate (7), and the baffle (72) is slidably provided on the mounting plate (41).

3. The device for detecting adhesive strength of an adhesive tape according to claim 2, wherein: The L-shaped plates (9) are fixedly arranged on both sides of the avoidance groove (711).

4. The device for detecting adhesive strength of an adhesive tape according to claim 1, wherein: The power-assisting plate (2) is provided with a crossbeam (21), the crossbeam (21) is fixedly connected to the sliding frame (5), one of the sliding frames (5) is provided with a scale (51), the sliding frame (5) is provided with a through hole (52), the L-shaped rod (82) is slidably provided in the through hole (52), and the power-assisting plate (2) is provided with a ball blocking mechanism (6).

5. The device for detecting adhesive tape adhesion according to claim 4, wherein: The ball blocking mechanism (6) comprises a C-shaped frame (61), the C-shaped frame (61) is fixedly arranged on the power-assisting plate (2), and a blocking rod (62) is rotatably arranged on the C-shaped frame (61).

6. The device for detecting adhesive tape adhesion according to claim 1, wherein: The pressing plate (3) is arranged in the groove (43), a pressing plate shaft (31) is fixedly arranged on the pressing plate (3), and the pressing plate (3) is rotatably arranged in the groove (43) via the pressing plate shaft (31).

7. The device for detecting adhesive tape adhesion according to claim 1, wherein: The rotating frame (12) is provided with two symmetrically arranged on the lower surface of the mounting plate (41), a crossbar (121) is fixedly provided through the rotating frame (12), and a pointer (122) is fixedly provided on the crossbar (121).

8. The device for detecting adhesive strength of an adhesive tape according to claim 7, wherein: The crossbar (121) is rotatably arranged on the stand (11), the stand (11) is fixedly mounted on the base (1), and a scale plate (13) is arranged on the stand (11).

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