High-precision detection device for hardness of paint film on production surface of weighing apparatus

Abstract

The invention discloses a high-precision detection device for the hardness of a paint film on the production surface of a weighing apparatus, and relates to the technical field of visual detection. Comprising a device body, the upper surface of the device body is connected with a lifting plate through a lifting assembly, the upper surface of the lifting plate is connected with a detection table through a moving assembly, and one side of the detection table is provided with a cleaning assembly for cleaning the surface of the weighing apparatus shell. The detection pencil can be initially limited through the elastic clamping ring, when the rotating block rotates, the detection pencil can be clamped and fixed through mutual cooperation of the moving block and the clamping block, meanwhile, the detection end of the detection pencil keeps stable contact with the surface of a paint film all the time, and after clamping of the detection pencil is completed, the detection pencil can be clamped and fixed. The included angle between the detection pencil and the surface of the paint film is just 45 degrees, the problems of uneven force application, angle deviation and the like in manual operation are avoided to a certain extent, the angle of the detection pencil can be adjusted through the gear and the teeth, and redetection operation under the same hardness grade can be completed without frequently disassembling and replacing the pencil.

Description

Technical Field

[0001] This invention relates to the field of visual inspection technology, specifically to a high-precision testing device for the hardness of surface paint film in weighing instrument production. Background Technology

[0002] Weighing instruments are measuring devices that use Hooke's Law or the lever balance principle of forces to measure the mass of objects. Simply put, they are a general term for all kinds of scales. They are core equipment used for accurate weighing in trade settlement, industrial production, logistics and transportation, people's livelihood, scientific research and other fields. By testing the hardness of the paint film of the weighing instrument, the protective performance of the paint film on the weighing instrument body and the reliability and service life of the weighing instrument can be guaranteed. As a measuring instrument, weighing instruments are mostly used in complex environments such as industry, commerce, and logistics. The paint film is the main protective layer of its metal body, and the hardness directly determines whether the paint film can play its due role.

[0003] In existing technologies, traditional paint film hardness testing typically involves mounting a pencil on a testing fixture, placing the fixture on the surface of the item being tested, and then manually moving the fixture across the product to leave scratches. The pencil marks are then wiped clean, and the scratches are examined to determine if the paint film hardness is acceptable. However, due to manual operation, the applied force, angle, and speed are uneven and cannot be precisely controlled, potentially leading to deviations in the test results. Furthermore, traditional testing fixtures have a simple design, only able to hold a single hardness grade pencil at a time. After completing one hardness grade test, the operator must manually disassemble and replace the pencil with the corresponding hardness grade pencil, then reassemble and adjust before proceeding to the next hardness grade test. This makes continuous testing of multiple hardness grades impossible, cumbersome, inefficient, and increases the workload for staff, making it inconvenient to use. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide a high-precision detection device for the surface paint film hardness of weighing instruments, so as to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-precision testing device for the surface hardness of paint film in weighing instrument production, comprising a device body, a lifting plate connected to the upper surface of the device body via a lifting assembly, a testing platform connected to the upper surface of the lifting plate via a moving assembly, a cleaning assembly for cleaning the surface of the weighing instrument shell on one side of the testing platform, a fixed frame fixedly connected to the upper surface of the device body on one side of the lifting plate, a fixed block fixedly connected to the end of the fixed frame, a visual inspection camera for inspecting the weighing instrument shell installed at the connection between the bottom end of the fixed block and the fixed frame, and a clamping assembly for clamping a pencil on the inner wall of the fixed block.

[0006] Preferably, the clamping assembly includes a rotating block rotatably connected to the inner wall of the fixed block. The rotating block has a through groove on its surface, and a transmission block is slidably connected to the inner wall of the through groove. L-shaped mounting plates are fixedly connected to both sides of the transmission block. An arc-shaped abutment is fixedly connected to the bottom of the rotating block on the side of the visual inspection camera. The end of the arc-shaped abutment away from the fixed block contacts the bottom of the transmission block.

[0007] Preferably, the L-shaped mounting plate has an opening on its surface, and the opening size is larger than the size of the detection pencil. A connecting block is fixedly connected to the upper surface of the L-shaped mounting plate. An elastic clamping ring is rotatably connected to one side surface of the connecting block. A limit block is fixedly connected to the outer wall of the elastic clamping ring. A limit groove matching the limit block is formed on one side surface of the connecting block.

[0008] Preferably, a clamping block is fixedly connected above the connecting block, a moving block is slidably connected to one inner wall of the clamping block, and grooves are provided on both inner walls of the clamping block. Sliding blocks matching the grooves are fixedly connected to both ends of the moving block, and a spring fixedly connected to the moving block is fixedly connected to the inner wall of the groove.

[0009] Preferably, the outer wall of the elastic clamping ring is fixedly connected to multiple sets of teeth above the limiting block, and a gear is rotatably connected to one side of the teeth on the upper surface of the connecting block. The gear meshes with the teeth, and a rotating rod is fixedly connected to the upper surface of the gear, and the rotating rod extends through the clamping block to the top of the rotating block.

[0010] Preferably, a motor is installed at one end of the fixed block, and the output end of the motor is connected to the rotating block. An arc-shaped cylinder is fixedly connected to the end of the fixed block away from the motor, and an arc-shaped rod that is fixedly connected to the rotating block is slidably connected to the inner wall of the bottom end of the arc-shaped cylinder.

[0011] Preferably, a piston is provided on the side surface of the moving block away from the clamping block. The piston is fixedly connected to the L-shaped mounting plate. A sliding rod fixedly connected to the moving block is slidably connected to the inner wall of the piston. A connecting pipe is fixedly connected to the end of the piston away from the moving block. The connecting pipe is connected to the arc-shaped cylinder.

[0012] Preferably, the cleaning component includes a mounting block fixedly connected to the upper surface of the lifting plate, an electric telescopic rod is mounted on the upper surface of the mounting block, and a connecting frame is connected to the output end of the electric telescopic rod. Two sets of rubber blocks are symmetrically fixedly connected to the inner wall of the connecting frame.

[0013] Preferably, a fan is installed inside the mounting block, and air blowing hoods are connected to both ends of the mounting block by fixing rods. Both sets of air blowing hoods are inclined, and the air blowing hoods are connected to the fan through fixing pipes.

[0014] In summary, the present invention has the following main beneficial effects: 1. This invention uses an elastic clamping ring to initially limit the position of the detection pencil. When the rotating block rotates, the gas inside the connecting pipe is delivered to the piston through the cooperation of the arc-shaped rod and the arc-shaped cylinder. This pushes out the sliding rod on the inner wall of the piston, causing the moving block to move. The detection pencil is then clamped and fixed through the cooperation of the moving block and the clamping block. Simultaneously, the detection pencil moves upward under the cooperation of the arc-shaped abutment and the transmission block, ensuring stable contact between the detection end of the pencil and the paint film surface. During the clamping process, the detection pencil rotates synchronously under the action of the rotating block. When the detection pencil is fully clamped... After clamping, the testing pencil is at a 45° angle to the paint film surface, which to some extent avoids problems such as uneven force and angle deviation in manual operation. After a single test is completed, the elastic clamping ring and the testing pencil rotate synchronously through the interaction of gears and teeth, and the angle of the testing pencil can be adjusted. The operation is simple and convenient, reducing the workload of the staff. The unused testing end of the testing pencil of the same hardness grade can be reused by switching the angle. The retesting of the same hardness grade can be completed without frequent disassembly and replacement of pencils. The operation is simple and convenient, reducing the workload of the staff. 2. This invention detects scratches drawn on the paint film surface of a weighing instrument using a detection pencil. A moving component then drives the detection platform to move in the opposite direction and reset. During the reset process, an electric telescopic rod drives a connecting frame in a reciprocating linear motion. The connecting frame then moves an rubber block to wipe away the pencil marks. Simultaneously, a fan generates a stable airflow, which is guided by an air guide hood. This airflow forms a directional blowing airflow that blows across the surface of the weighing instrument's outer shell, removing residual dust from the scratches and debris generated by the rubber block. This prevents debris from interfering with subsequent test data, further ensuring the accuracy of the test results. Furthermore, a visual inspection camera replaces manual observation. Through visual inspection and data acquisition, the width and depth of scratches on the paint film surface are analyzed. Based on a preset threshold, the hardness is determined, avoiding subjective misjudgments from manual observation and improving testing efficiency. Attached Figure Description

[0015] Figure 1 This is a first-view perspective three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 This is a second-view perspective three-dimensional schematic diagram of the overall structure of the present invention; Figure 3 This is a three-dimensional schematic diagram of the overall structure of the testing station and cleaning components of the present invention; Figure 4 This is a three-dimensional schematic diagram of the overall structure of the fixing frame and clamping assembly of the present invention from a first-view perspective; Figure 5 This is a two-dimensional perspective view of the overall structure of the fixing frame and clamping assembly of the present invention. Figure 6 This is a three-dimensional schematic diagram of the fixing block portion of the present invention; Figure 7 This is a top-view perspective view of a portion of the clamping component structure of the present invention; Figure 8 This is a three-dimensional schematic diagram of the disassembled structure of some clamping components of the present invention; Figure 9 This is a three-dimensional exploded view of the clamping block structure of the present invention.

[0016] In the diagram: 1. Main body of the device; 2. Lifting plate; 3. Detection table; 41. Mounting block; 42. Connecting frame; 43. Rubber block; 44. Blower cover; 5. Fixing frame; 51. Fixing block; 52. Visual inspection camera; 53. Arc-shaped support rod; 61. Rotating block; 62. Transmission block; 63. L-shaped mounting plate; 64. Connecting block; 641. Limiting groove; 65. Elastic clamping ring; 651. Tooth; 652. Limiting block; 66. Gear; 67. Clamping block; 671. Moving block; 68. Piston; 681. Connecting pipe; 69. Arc-shaped cylinder; 691. Arc-shaped rod. Detailed Implementation

[0017] To further illustrate the technical means and effects adopted by the present invention in order to achieve the intended purpose, the following detailed description is provided in conjunction with the accompanying drawings and preferred embodiments, based on the specific implementation methods, structures, features and effects of the present invention.

[0018] A high-precision testing device for the surface hardness of paint film in weighing instrument production, such as Figures 1-9 As shown, the device includes a main body 1. A lifting plate 2 is connected to the upper surface of the main body 1 via a lifting assembly. The lifting assembly includes an electric push rod, which can push the lifting plate 2 to lift and lower, thereby facilitating the adjustment of the height of the object being tested and keeping the object at the same height. This ensures that the testing pencil remains in contact with the surface of the object being tested. A testing platform 3 is connected to the upper surface of the lifting plate 2 via a moving assembly. The moving assembly includes a threaded rod, which can be driven by a drive device to rotate, thereby driving the testing platform 3 to move parallel to and reciprocate on the surface of the lifting plate 2. A cleaning assembly for cleaning the surface of the weighing instrument is provided on one side of the testing platform 3. A fixing frame 5 is fixedly connected to the upper surface of the main body 1 on one side of the lifting plate 2. A fixing block 51 is fixedly connected to the end of the fixing frame 5. A visual inspection camera 52 for inspecting the surface of the weighing instrument is installed at the connection between the bottom end of the fixing block 51 and the fixing frame 5. The visual inspection camera 52 can perform visual inspection and data acquisition on the surface of the weighing instrument, thereby facilitating the detection of paint film hardness. A clamping assembly for holding the pencil is provided on the inner wall of the fixing block 51.

[0019] See Figures 4-6It is known that the clamping assembly includes a rotating block 61 rotatably connected to the inner wall of the fixed block 51. The surface of the rotating block 61 is provided with a through groove, and a transmission block 62 is slidably connected to the inner wall of the through groove. The through groove can limit the L-shaped mounting plate 63, and the inner wall of the through groove is provided with a channel for the transmission block 62 to move. The channel can limit the mechanical energy of the transmission block 62. The L-shaped mounting plate 63 is fixedly connected to both sides of the transmission block 62. The bottom end of the rotating block 61 is fixedly connected to an arc-shaped abutment 53 on one side of the visual inspection camera 52. The end of the arc-shaped abutment 53 away from the fixed block 51 contacts the bottom end of the transmission block 62. When the rotating block 61 rotates, under the action of the arc-shaped abutment 53, the transmission block 62 is pushed to move upward, thereby moving the inspection pencil.

[0020] See Figure 8 It can be seen that the L-shaped mounting plate 63 has an opening on its surface, and the size of the opening is larger than the size of the detection pencil. A connecting block 64 is fixedly connected to the upper surface of the L-shaped mounting plate 63. An elastic clamping ring 65 is rotatably connected to one side surface of the connecting block 64. The detection pencil can be initially clamped by the elastic clamping ring 65. A limiting block 652 is fixedly connected to the outer wall of the elastic clamping ring 65. A limiting groove 641 matching the limiting block 652 is opened on one side surface of the connecting block 64. The elastic clamping ring 65 can be limited by the mutual cooperation between the limiting block 652 and the limiting groove 641.

[0021] See Figure 8 and Figure 9 It can be seen that a clamping block 67 is fixedly connected above the connecting block 64, and a moving block 671 is slidably connected to the inner wall of one side of the clamping block 67. Slide grooves are opened on the inner walls of both sides of the clamping block 67. Sliding blocks that match the slide grooves are fixedly connected to both ends of the moving block 671, and a spring that is fixedly connected to the moving block 671 is fixedly connected to the inner wall of the slide groove. The clamping block 67 and the moving block 671 can clamp and limit the detection pencil through their mutual cooperation. With the setting of the spring, when the moving block 671 is not subjected to the squeezing force, the moving block 671 can be pushed to separate from the clamping block 67 under the action of the spring, so as to facilitate the initial positioning of the detection pencil inserted into the inner wall of the elastic clamping ring 65.

[0022] See Figure 8 It is known that the outer wall of the elastic clamping ring 65 is fixedly connected to multiple sets of teeth 651 above the limiting block 652. A gear 66 is rotatably connected to one side of the teeth 651 on the upper surface of the connecting block 64. The gear 66 meshes with the teeth 651. A rotating rod is fixedly connected to the upper surface of the gear 66, and the rotating rod passes through the clamping block 67 and extends above the rotating block 61. After a single test is completed, the gear 66 is rotated by the rotating rod. With the cooperation of the gear 66 and the teeth 651, the elastic clamping ring 65 and the test pencil can be driven to rotate synchronously, thereby driving the test pencil to complete the circumferential angle adjustment, so that the brand-new test end of the test pencil that has not participated in the test faces the paint film surface for the next use.

[0023] See Figure 6 It is known that a motor is installed at one end of the fixed block 51, and the output end of the motor is connected to the rotating block 61. An arc-shaped cylinder 69 is fixedly connected to the end of the fixed block 51 away from the motor. An arc-shaped rod 691, which is fixedly connected to the rotating block 61, is slidably connected to the inner wall of the bottom end of the arc-shaped cylinder 69. The arc-shaped rod 691 moves in a circular motion around the center of rotation of the rotating block 61. When the rotating block 61 rotates, it can drive the arc-shaped rod 691 to rotate synchronously, thereby compressing the gas inside the arc-shaped cylinder 69.

[0024] See Figure 8 and Figure 9 It is known that a piston 68 is provided on the side surface of the movable block 671 away from the clamping block 67. The piston 68 is fixedly connected to the L-shaped mounting plate 63. A slide rod fixedly connected to the movable block 671 is slidably connected to the inner wall of the piston 68. A connecting pipe 681 is fixedly connected to the end of the piston 68 away from the movable block 671. The connecting pipe 681 is connected to the arc-shaped cylinder 69. The gas inside the arc-shaped cylinder 69 is compressed and enters the interior of the connecting pipe 681. Then, it is transmitted to the piston 68 through the connecting pipe 681, which pushes the slide rod out. The slide rod pushes the movable block 671 to move, and cooperates with the clamping block 67 to clamp the detection pencil.

[0025] See Figure 3 It is known that the cleaning component includes a mounting block 41 fixedly connected to the upper surface of the lifting plate 2. An electric telescopic rod is mounted on the upper surface of the mounting block 41, and a connecting frame 42 is connected to the output end of the electric telescopic rod. Two sets of rubber blocks 43 are symmetrically fixedly connected to the inner wall of the connecting frame 42. The electric telescopic rod can work with the connecting frame 42 to push the rubber blocks 43 to move back and forth, so as to wipe the scratches drawn by the detection pencil, which is convenient for subsequent testing. The mounting block 41 is equipped with a fan. Both ends of the mounting block 41 are connected to the blower hoods 44 by fixing rods. Both sets of blower hoods 44 are set at an angle, and the blower hoods 44 are connected to the fan through fixing pipes. The airflow generated by the fan is guided by the blower hoods 44 and blown onto the paint film surface of the weighing instrument shell. This blows away the debris and dust generated during the wiping process of the rubber block 43 from the paint film surface, thus preventing the debris and dust from affecting the subsequent test results.

[0026] The working principle of this invention is as follows: When it is necessary to test the hardness of the paint film of a weighing instrument, the outer shell of the weighing instrument of the same specification is placed on the bearing surface of the testing platform 3. The outer shell of the weighing instrument is limited and fixed by the locking block set on the surface of the testing platform 3. Then, the lifting assembly is started, and the lifting plate 2 is driven to rise and fall by the lifting assembly to adjust the height of the outer shell of the weighing instrument to a fixed height, thereby facilitating the provision of a suitable operating position and ensuring the smooth progress of subsequent testing procedures. Once the weighing instrument's outer shell is fixed in position, test pencils of different hardness are inserted between the elastic clamping rings 65. The elastic force of the elastic clamping rings 65 temporarily positions the pencils. The test pencils are pressed towards the weighing instrument's outer shell, bringing the test ends of the test pencils into contact with the paint film surface of the weighing instrument's outer shell. Then, the motor is started, driving the rotating block 61 to rotate downwards. When the rotating block 61 rotates, it abuts against the preset arc-shaped abutment 53 and pushes the arc-shaped abutment 53 to produce displacement, thereby driving the transmission block 62 to move synchronously in a straight line. Under the transmission action of the transmission block 62, the test pencils move synchronously in conjunction with the L-shaped mounting plate 63. While the rotating block 61 rotates, the arc-shaped rod 691 moves into the arc-shaped cylinder 69, compressing the sealed gas inside the arc-shaped cylinder 69. The compressed gas enters the piston 68 through the connecting pipe 681. The gas compression force pushes the slide rod, which is slidably connected to the inner wall of the piston 68, to produce axial displacement. The slide rod then pushes the moving block 671 to move synchronously. The moving block 671, in conjunction with the clamping block 67, clamps and fixes the detection pencil. During the clamping process, the L-shaped mounting plate 63 simultaneously moves the detection pencil to the preset detection height. At this time, the detection pencil and the paint film surface of the weighing instrument shell are at a standard 45° angle, and the detection end of the detection pencil maintains stable contact with the paint film surface. Then, a counterweight is installed on the upper end of the fixing block 51, and a standard detection pressure is applied to the detection pencil through the counterweight. Then the moving component is activated. The moving component drives the testing platform 3 to move the outer shell of the weighing instrument to be tested in a straight line on the surface of the lifting plate 2. At this time, the testing pencil and the paint film surface of the weighing instrument outer shell have a relative scraping motion, which in turn forms a testing scratch on the paint film surface. When the testing platform 3 completes the movement of the preset stroke, the motor drives the rotating block 61 to rotate in the opposite direction and reset to the initial position. At this time, the transmission block 62 and the moving block 671 reset synchronously, and the moving block 671 releases the clamping force on the testing pencil. After a single hardness test is completed, the moving component drives the testing platform 3 to move the outer shell of the weighing instrument to be tested in the reverse direction and reset to the initial testing position. During the reset process of the testing platform 3, the electric telescopic rod drives the connecting frame 42 to move back and forth linearly. Through the connecting frame 42, the rubber block 43 comes into contact with the paint film surface to wipe and clean the test scratches formed by the testing pencil. At the same time, the fan is started, and the airflow generated by the fan is transmitted to the blower hood 44 through the fixed pipe. After being guided by the blower hood 44, it is blown onto the paint film surface of the weighing instrument outer shell, blowing away the debris and dust generated during the wiping process of the rubber block 43. To prevent debris and dust from affecting subsequent test results, after cleaning the paint film surface, the visual inspection camera 52 installed at the bottom of the fixing block 51 can perform visual inspection and data collection on the surface of the weighing instrument shell. If the scratch width exceeds the set threshold or penetrates the paint film, it is determined that the paint film at the inspection location has been scratched and damaged. This indicates that the hardness level of the paint film of the weighing instrument shell is lower than the hardness level of the pencil used in this test, and the hardness index of the paint film of the weighing instrument shell is unqualified. Conversely, the hardness index of the paint film of the weighing instrument shell is qualified. After a single test is completed, the rotating rod is rotated, which drives the gear 66 to rotate. The gear 66 transmits power through its meshing teeth 651 and drives the elastic clamping ring 65 to rotate synchronously. This causes the testing pencil to complete the circumferential angle adjustment, so that the new testing end of the testing pencil that is not used in the test faces the paint film surface. This ensures that the testing end can make precise contact with the paint film surface of the weighing instrument shell during subsequent tests. After the angle adjustment of the testing pencil is completed, the weighing instrument shell is moved, and the above testing operation steps are repeated. A testing pencil of the same hardness grade is used to form a testing scratch on the paint film surface of the weighing instrument shell again, completing the paint film hardness retest at the same hardness grade. This completes the paint film hardness test of the weighing instrument shell. The content not described in detail in this description belongs to the prior art known to those skilled in the art.

[0027] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A device for high-precision detection of the hardness of a surface paint film for a weighing instrument, comprising a device body (1), characterized in that: The upper surface of the device body (1) is connected with a lifting plate (2) through a lifting assembly, the upper surface of the lifting plate (2) is connected with a detection table (3) through a moving assembly, one side of the detection table (3) is provided with a cleaning assembly for cleaning the surface of the counter balance shell, the upper surface of the device body (1) is fixedly connected with a fixing frame (5) on one side of the lifting plate (2), the end of the fixing frame (5) is fixedly connected with a fixing block (51), the bottom end of the fixing block (51) is provided with a visual detection camera (52) for detecting the counter balance shell, and the inner wall of the fixing block (51) is provided with a clamping assembly for clamping a pencil.

2. The device for high-precision detection of the surface paint film hardness of a weighing instrument according to claim 1, characterized in that: The clamping assembly comprises a rotating block (61) rotatably connected to the inner wall of the fixing block (51), a through groove is formed in the surface of the rotating block (61), and a transmission block (62) is slidably connected to the inner wall of the through groove, L-shaped mounting plates (63) are fixedly connected to the surfaces of the transmission block (62) on both sides, an arc-shaped abutting rod (53) is fixedly connected to the bottom end of the rotating block (61) on one side of the visual detection camera (52), and the end of the arc-shaped abutting rod (53) away from the fixing block (51) is in contact with the bottom end of the transmission block (62).

3. The device for high-precision detection of the surface paint film hardness of a weighing instrument according to claim 2, characterized in that: An opening is formed in the surface of the L-shaped mounting plate (63), and the size of the opening is greater than the size of the detected pencil, a connecting block (64) is fixedly connected to the upper surface of the L-shaped mounting plate (63), an elastic clamping ring (65) is rotatably connected to the surface of the connecting block (64) on one side, a limiting block (652) is fixedly connected to the outer wall of the elastic clamping ring (65), and a limiting groove (641) matched with the limiting block (652) is formed in the surface of the connecting block (64) on one side.

4. The device for high-precision detection of the surface paint film hardness of a weighing instrument according to claim 3, characterized in that: A clamping block (67) is fixedly connected above the connecting block (64), a moving block (671) is slidably connected to the inner wall of one side of the clamping block (67), and sliding grooves are formed in the inner walls of the clamping block (67) on both sides.

5. The device for high-precision detection of the surface paint film hardness of a weighing instrument according to claim 4, characterized in that: A plurality of tooth gears (651) are fixedly connected to the outer wall of the elastic clamping ring (65) above the limiting block (652), a gear (66) is rotatably connected to the upper surface of the connecting block (64) on one side of the tooth gear (651), the gear (66) is engaged with the tooth gear (651), a rotating rod is fixedly connected to the upper surface of the gear (66), and the rotating rod penetrates through the clamping block (67) and extends above the rotating block (61).

6. The device for high-precision detection of the surface paint film hardness of a weighing instrument according to claim 1, characterized in that: A motor is installed at one end of the fixing block (51), the output end of the motor is connected with the rotating block (61), an arc-shaped cylinder (69) is fixedly connected to the end of the fixing block (51) away from the motor, and an arc-shaped rod (691) fixedly connected with the rotating block (61) is slidably connected to the inner wall of the bottom end of the arc-shaped cylinder (69).

7. The device for high-precision detection of the surface paint film hardness of a weighing instrument according to claim 4, characterized in that: The mobile block (671) is provided with a piston (68) away from the side surface of the clamping block (67), the piston (68) is fixedly connected with the L-shaped mounting plate (63), the inner wall of the piston (68) is slidably connected with a sliding rod fixedly connected with the mobile block (671), and one end of the piston (68) away from the mobile block (671) is fixedly connected with a connecting pipe (681), the connecting pipe (681) is communicated with the arc-shaped cylinder (69).

8. The device for high-precision detection of the surface paint film hardness of a weighing instrument according to claim 1, characterized in that: The cleaning assembly comprises a mounting block (41) fixedly connected to the upper surface of the lifting plate (2), an electric telescopic rod is mounted on the upper surface of the mounting block (41), and a connecting frame (42) is connected to the output end of the electric telescopic rod, and two groups of rubber blocks (43) are fixedly connected to the inner wall of the connecting frame (42) in a symmetrical manner.

9. The device for high-precision detection of the surface paint film hardness of a weighing instrument according to claim 8, characterized in that: The mounting block (41) is internally provided with a fan, and the mounting block (41) is connected with a blowing cover (44) at both ends through a fixing rod, and the two groups of blowing covers (44) are both arranged in an inclined manner, and the blowing cover (44) is communicated with the fan through a fixing pipe.

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