Pencil hardness meter

Abstract

The invention relates to the technical field of measuring equipment, and discloses a pencil durometer which comprises a base table, penholder tables are symmetrically arranged at the top of the base table, pen clamping outer sleeves are symmetrically arranged between the inner sides of the penholder tables, center shafts are fixedly connected to the outer walls of the centers of the pen clamping outer sleeves, and the center shafts are movably connected with the inner walls of the penholder tables. A correction table is fixedly connected to the top of the base table, a sample plate is arranged on one side of the correction table, a lifting assembly for adjusting the height of the pen rack table is arranged on the side face of the pen rack, and an adjusting assembly for adjusting the angle of the pen clamping outer sleeve is arranged on the side face of the pen clamping outer sleeve and drives the pen clamping outer sleeve to rotate around a center shaft. The included angle between the pencil and the base table is gradually adjusted by taking degree as increment, the inclination angle of the pencil is gradually increased, the adjusting assembly enables multiple scratches at different angles to be formed on the surface of the sample plate, scratching scenes of the pencil at different inclination angles are simulated, and the material hardness is comprehensively evaluated.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of measuring equipment, and particularly relates to a pencil hardness tester. BACKGROUND

[0002] The pencil hardness tester is a standardized testing tool for determining the hardness of the surface coating, film or substrate of a material. The core principle is to evaluate the scratch resistance or wear resistance of the material by scratching the surface with pencil leads of different hardness. By simulating the process of scratching the material surface with pencil leads, the scratch test is performed on the coating or substrate with pencil leads of known hardness (classified according to international standards) to determine the ability of the material surface to resist scratching. The test result is expressed in pencil hardness grades (such as 6B to 9H), and the higher the grade, the harder the material.

[0003] In the existing pencil scratch test on the paint film, the test sample is horizontally arranged, and the fixed pencil on the pencil hardness tester is only at a fixed angle of 45 degrees with the horizontal plane. The test angle is single, and the anti-scratch performance of the paint film under different stress directions (such as vertical and oblique) cannot be reflected. In actual use, the paint film may be subjected to multi-angle friction or impact. The fixed angle test is inconsistent with the actual working condition, resulting in inaccurate quality evaluation.

[0004] Therefore, the application provides a pencil hardness tester. SUMMARY

[0005] To make up for the deficiencies of the prior art: solve at least one technical problem raised in the background.

[0006] The technical scheme adopted by the application to solve the technical problem is: the pencil hardness tester comprises a base table, a pencil rack table is symmetrically arranged on the top of the base table, a pencil clamping outer sleeve is symmetrically arranged between the inner sides of the pencil rack table, a center shaft is fixedly connected to the outer wall of the center of the pencil clamping outer sleeve, the center shaft is movably connected to the inner wall of the pencil rack table, a fastening assembly is arranged on the outer wall of the pencil rack table, the fastening assembly clamps and fixes the pencil by adjusting the distance between the two pencil clamping outer sleeves, a calibration table is fixedly connected to the top of the base table, a test sample plate is arranged on one side of the calibration table, the top of the calibration table is flush with the top of the test sample plate, a driving assembly for driving the pencil rack table to move laterally is arranged on the outer side of the pencil rack table, a lifting assembly for adjusting the height of the pencil rack table is arranged on the side surface of the pencil rack table, and an adjusting assembly for adjusting the angle of the pencil clamping outer sleeve is arranged on the side surface of the pencil clamping outer sleeve.

[0007] Preferably, the fastening assembly comprises two groups of arc-shaped sliding rails, the arc-shaped sliding rails are fixedly installed on the inner wall of the pencil rack table, the inner wall of the arc-shaped sliding rail is movably connected with an arc-shaped rebound sliding block, the inner wall of the arc-shaped rebound sliding block is threadedly connected with a screw rod, and one end of the screw rod is fixedly connected with the outer wall of the pencil clamping outer sleeve.

[0008] Preferably, the lifting assembly comprises two receiving plates fixedly connected to the outer wall of the pen rack table, one side of each receiving plate is fixedly connected with a sliding block two, the outer wall of the sliding block two is slidingly connected with an inner groove seat, the inner wall surface of the inner groove seat is fixedly connected with an extension rod one, and the bottom end of the extension rod one is fixedly connected with the top of the sliding block two.

[0009] Preferably, the adjusting assembly comprises a push rod, the push rod is attached to the bottom of the pen clamping outer sleeve, the outer wall of the push rod is fixedly connected with a connecting rod, one end of the connecting rod is fixedly connected with a moving block, and the moving block is provided with a moving assembly on both sides, the moving assembly drives the moving block to move horizontally.

[0010] Preferably, the moving assembly comprises two side connecting tables fixedly connected to the side wall of the pen rack table, a sliding rod frame fixedly connected between the side connecting table and the pen rack table, and an electric sliding block slidingly connected to the surface of the side connecting table and slidingly connected between the electric sliding block and the sliding rod frame.

[0011] Preferably, the driving assembly comprises two baffle plates one, the baffle plates one are fixedly installed on the top of the base table, the inner wall of the baffle plate one is rotatably connected with a threaded rod, the outer wall of the threaded rod is threadedly connected with a sliding block one, the top of the sliding block one is fixedly connected with the top of the inner groove seat, the sliding block one is slidingly connected with the surface of the base table, one end of the threaded rod is fixedly connected with an electric machine, and the electric machine is fixedly installed on the top of the base table.

[0012] Preferably, the bottom of the sample plate is provided with a clamping plate table, the bottom of the clamping plate table is fixedly connected with a bottom sliding block, the bottom sliding block is slidingly connected with the surface of the base table, the top of the base table is fixedly connected with a top plate in a symmetrical mode, the top plate is fixedly connected with a fixed connecting rod, the bottom sliding block is slidingly connected with the fixed connecting rod, one side of the clamping plate table is fixedly connected with a handle, the handle is slidingly connected with the inner wall of one of the top plates, and the side surface of the bottom sliding block is provided with a clamping component for limiting the bottom sliding block.

[0013] Preferably, the clamping component comprises two connecting blocks, one side of each connecting block is fixedly connected with a connecting spring, the connecting spring is fixedly connected to the side surface of the bottom sliding block, the surface of the base table is symmetrically slidingly connected with a clamping table, the surface of the clamping table is provided with a plurality of clamping grooves, and one side of the connecting block is a slope.

[0014] Preferably, the plurality of clamping grooves are arranged at equal intervals.

[0015] Preferably, one side of the clamping table is fixedly connected with an extension rod two, the extension rod two is fixedly connected to the surface of the base table, and a return spring is fixedly connected between the side surface of the bottom sliding block and one side of one of the top plates.

[0016] The beneficial effects of the present application are as follows:

[0017] 1. The pencil hardness tester, the adjusting assembly is rotated around the central shaft by the driving pencil sleeve, the angle between the pencil and the base table is adjusted in degrees, the pencil inclination angle is gradually increased, the adjusting assembly forms multiple different angle scratches on the sample plate surface, simulates the pencil scratching scene under different inclination angles, and comprehensively evaluates the material hardness.

[0018] 2. The pencil hardness tester, the distance between the scratches left by the pencil on the sample plate surface is equal through the clamping assembly, so that the worker can control the force of pulling the handle, avoid excessive force causing the sample plate to displace too much, and prevent insufficient force from causing the connecting block to not be completely clamped into the clamping groove, ensure that the displacement amount is constant after each pulling, the clamping assembly automatically locks the current position and ensures that the single displacement amount is constant, the distance between adjacent scratches is consistent, and subsequent comparison and evaluation is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0019] The application will be further described below with reference to the drawings.

[0020] Figure 1 is the overall perspective view of the application;

[0021] Figure 2 is a structure schematic view of the slider in the application;

[0022] Figure 3 is a structure schematic view of the central shaft in the application;

[0023] Figure 4 is a structure schematic view of the pencil sleeve in the application;

[0024] Figure 5 is a structure schematic view of the pencil rack table in the application;

[0025] Figure 6 is a structure schematic view of the push rod in the application;

[0026] Figure 7 is a structure schematic view of the telescopic rod in the application;

[0027] Figure 8 is a structure schematic view of the sample plate in the application;

[0028] Figure 9 is a structure schematic view of the clamping table in the application.

[0029] In the diagram: 1. Base platform; 2. Pen holder platform; 3. Pen clip sleeve; 4. Central shaft; 5. Calibration platform; 6. Sample plate; 7. Arc-shaped slide rail; 8. Arc-shaped spring-loaded slider; 9. Helical rod; 10. Baffle one; 11. Threaded rod; 12. Slider one; 13. Motor; 14. Support plate; 15. Slider two; 16. Inner groove seat; 17. Telescopic rod one; 18. Moving block; 19. Connecting rod; 20. Push rod; 21. Side receiving platform; 22. Electric slider; 23. Sliding rod frame; 24. Pencil; 25. Clamping plate platform; 26. Bottom slider; 27. Top plate; 28. Fixed connecting rod; 29. ​​Handle; 30. Connecting spring; 31. Connecting block; 32. Positioning platform; 33. Slot; 34. Telescopic rod two; 35. Return spring. Detailed Implementation

[0030] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0031] like Figures 1 to 9 As shown, the present invention provides a technical solution: a pencil hardness tester, including a base platform 1, a pencil holder platform 2 symmetrically arranged on the top of the base platform 1, a pencil clamping sleeve 3 symmetrically arranged between the inner sides of the pencil holder platform 2, a pencil 24 arranged between the two pencil clamping sleeves 3, a central shaft 4 fixedly connected to the outer wall of the center of each pencil clamping sleeve 3, the central shaft 4 being movably connected to the inner wall of the pencil holder platform 2, a fastening component provided on the outer wall of the pencil holder platform 2, the fastening component clamping and fixing the pencil 24 by adjusting the distance between the two pencil clamping sleeves 3, a calibration platform 5 fixedly connected to the top of the base platform 1, a sample plate 6 arranged on one side of the calibration platform 5, the top of the calibration platform 5 being flush with the top of the sample plate 6, a driving component for driving the pencil holder platform 2 to move laterally arranged on the outer side of the pencil holder platform 2, a lifting component for adjusting the height of the pencil holder platform 2 arranged on the side of the pencil holder platform 2, and an adjustment component for adjusting the angle of the pencil clamping sleeve 3 arranged on the side of the pencil clamping sleeve 3.

[0032] During operation: In this state, the angle between the two pen clip sleeves 3 and the base platform 1 is 30 degrees. The test pencil 24 is placed between the two pen clip sleeves 3. The distance between the two pen clip sleeves 3 is adjusted by the fastening component so that the pencil 24 can be clamped and fixed between the two pen clip sleeves 3. At this time, the tip of the pencil 24 is in contact with the top of the calibration platform 5. Then, the drive component is activated for the first time, which drives the entire pen holder platform 2 to move laterally. Since the top of the calibration platform 5 is flush with the top of the sample plate 6, the tip of the pencil 24 can leave the first scratch on the surface of the sample plate 6 when it moves. This scratch is the result measured when the pencil 24 is tilted at 30 degrees. Then, the entire pen holder platform 2 is reset by the drive component.

[0033] After the pen rack table 2 is reset, the position of the sample plate 6 is first moved so that the new area on the surface of the sample plate 6 is the position for the next round of marking, and then the entire pen rack table 2 is raised by a first distance by the lifting assembly, and after the first distance is raised, the adjusting assembly moves, and the adjusting assembly rotates the pencil outer sleeve 3 about the central shaft 4 as the axis, so that the angle between the pencil outer sleeve 3 and the pencil 24 and the base table 1 changes from 30 degrees to 45 degrees. In this process, the pencil tip of the pencil 24 rotates downward, and the overall longitudinal height of the pencil 24 increases, but because the overall height of the pen rack table 2 is raised, the increased longitudinal height of the pencil 24 is just compensated, so that after the angle is changed, the pencil tip can still fit the top of the correction table 5, so that when the driving assembly drives the entire pen rack table 2 to move horizontally for the second time, the pencil tip can still fit the surface of the sample plate 6 after the angle is changed, so that a second mark is left on the surface of the sample plate 6, and then the driving assembly resets the entire pen rack table 2 again.

[0034] Subsequently, the entire pen rack table 2 is raised again by the lifting assembly, and the adjusting assembly changes the angle between the pencil outer sleeve 3 and the pencil 24 and the base table 1 from 45 degrees to 60 degrees, thereby performing a third measurement. After each measurement, the angle of the pencil 24 is increased by 15 degrees, until the pencil 24 is measured at an angle of 90 degrees for the last time. The pencil 24 is removed, and at this time, the surface of the sample plate 6 leaves multiple marks, so that the damage to the paint film at different angles is evaluated by the marks.

[0035] Through the above embodiment, the adjusting assembly drives the pencil outer sleeve 3 to rotate about the central shaft 4, so that the angle between the pencil 24 and the base table 1 is gradually adjusted by increments of 15 degrees, and the inclination angle of the pencil 24 is gradually increased. The adjusting assembly forms multiple marks of different angles on the surface of the sample plate 6, simulates the scratching scenario of the pencil 24 at different inclination angles, and comprehensively evaluates the material hardness. When the adjusting assembly changes the angle of the pencil 24, the pencil tip of the pencil 24 moves downward and the longitudinal height increases due to the increase in the inclination angle. The lifting assembly synchronously lifts the overall height of the pen rack table 2 to compensate for the displacement, so that the pencil tip always closely fits the top of the correction table 5, avoids the pencil tip from being separated from the reference surface due to angle adjustment, ensures that the initial conditions of each mark test are consistent, improves data reliability, automatically completes height compensation after each angle adjustment, so that the equipment can quickly enter the next test state, and the single test time is significantly shortened.

[0036] As shown in Figures 3 to 4 The fastening assembly includes two groups of arc-shaped sliding rails 7, which are fixedly installed on the inner wall of the pen rack table 2. The inner wall of the arc-shaped sliding rail 7 is slidably connected with an arc-shaped rebound sliding block 8, and the inner wall of the arc-shaped rebound sliding block 8 is threadedly connected with a screw rod 9, one end of the screw rod 9 is fixedly connected with the outer wall of the pencil outer sleeve 3.

[0037] When working: the pencil to be tested 24 is vertically placed between the two pencil clamping covers 3, the pencil tip of the pencil 24 contacts the correction table 5 to complete the axial positioning, the two pencil clamping covers 3 can wrap and clamp the pencil 24 by twisting the plurality of screw rods 9, so that the pencil 24 is not easy to shake during the test; when the angle between the pencil 24 and the test platform needs to be adjusted, the connection state of the screw rod 9 and the pencil clamping cover 3 is maintained, the arc-shaped rebound slider 8 is moved along the arc-shaped sliding rail 7 to drive the pencil clamping cover 3 to drive the pencil 24 to rotate around the central shaft 4, the angle adjustment is realized, and the arc-shaped track of the sliding rail takes the central shaft 4 as the center to ensure that the pencil clamping cover 3 only moves in the radial direction when the arc-shaped rebound slider 8 slides, so as to avoid deflection or torsion and improve the stability of angle adjustment.

[0038] As shown in Figures 5 to 7 , the lifting assembly includes two receiving plates 14, which are fixedly connected to the outer wall of the pencil rack table 2, and one side of each receiving plate 14 is fixedly connected with a sliding block two 15, the outer wall of the sliding block two 15 is slidingly connected with an inner groove seat 16, the inner wall surface of the inner groove seat 16 is fixedly connected with an extension rod one 17, and the bottom end of the extension rod one 17 is fixedly connected with the top of the sliding block two 15.

[0039] When working: when the driving assembly drives the pencil rack table 2 to move horizontally, after the first scratch test is completed, the sliding block two 15 moves upward along the inner wall of the inner groove seat 16 through the contraction movement of the extension rod one 17, which drives the entire pencil rack table 2 to move upward at this time, and the pencil rack table 2 moves upward to compensate for the change in the longitudinal height of the pencil 24; since the angle between the pencil clamping cover 3 and the pencil 24 increases according to the equal difference increasing rule, in order to ensure that the increase in the height of the pencil rack table 2 can accurately compensate for the change in the longitudinal height of the pencil 24, the distance that the sliding block two 15 moves upward along the inner wall of the inner groove seat 16 each time needs to be measured in advance, which can be calculated according to the trigonometric function relationship, and it needs to be particularly pointed out that all pencils are fixed at an inclination angle of 30 degrees in the initial state, and the pencil tip is attached to the surface of the correction table 5, therefore, only one measurement and calculation is required, and the obtained parameters can be applied to the test process of all subsequent pencils.

[0040] As shown in Figures 5 to 6 , the adjusting assembly includes a push rod 20, the push rod 20 is attached to the bottom of the pencil clamping cover 3, the outer wall of the push rod 20 is fixedly connected with a connecting rod 19, one end of the connecting rod 19 is fixedly connected with a moving block 18, and a moving assembly is arranged on both sides of the moving block 18, which drives the moving block 18 to move horizontally.

[0041] When the pen holder 2 completes the height rising action, the driving moving assembly drives the moving block 18 to move laterally, and when the moving block 18 moves laterally, it acts on the push rod 20 through the connecting rod 19, the push rod 20 is horizontally pushed and continuously extruded on the bottom of the upper half of the pencil holder 3, and since the pencil holder 3 is rotated around the central shaft 4 as the rotating fulcrum, the extrusion is converted into the torque of the rotation around the shaft, which drives the pencil holder 3 to rotate synchronously with the pencil 24, so as to accurately adjust the angle between the pencil 24 and the base table 1 in the equal difference incremental law of 15 degrees each time.

[0042] As shown in Figures 5 to 6 , the moving assembly comprises two side connecting tables 21, the side connecting tables 21 are fixedly connected to the side walls of the pen holder 2, the slide rod holder 23 is fixedly connected between the side connecting tables 21 and the pen holder 2, the surface of the side connecting table 21 is slidingly connected with the electric sliding block 22, and the electric sliding block 22 is slidingly connected with the slide rod holder 23.

[0043] When the pen holder 2 completes the height adjustment action, the electric sliding block 22 automatically slides along the surface of the side connecting table 21 by a preset distance. In this process, the push rod 20 is horizontally displaced along the guide direction of the slide rod holder 23 under the drive of the electric sliding block 22, and the end thereof continuously presses the bottom of the upper half of the pencil holder 3. Through this mechanical linkage mechanism, the angle between the pencil 24 and the base table 1 is adjusted in the equal difference incremental law with a tolerance of 15 degrees, and the angle is accurately increased by 15 degrees each time. In order to ensure the accuracy of the angle adjustment, the single movement distance of the electric sliding block 22 needs to be calculated in advance through the trigonometric relationship; specifically, according to the position of the action point of the push rod 20, the geometric parameters of the pencil holder 3 and the target angle change, a displacement-angle conversion mathematical model is established, and the displacement parameter measured through the model has universality, which only needs to be measured and calculated once in the initial debugging stage of the equipment, so as to guide the positioning control of the electric sliding block 22 in all subsequent adjustment cycles, thereby ensuring the repeated accuracy and reliability of the angle incremental adjustment of the pencil 24.

[0044] As shown in Figures 1 to 2 , the driving assembly comprises two baffle plates 10, the baffle plates 10 are fixedly installed on the top of the base table 1, the inner walls of the baffle plates 10 are rotationally connected with threaded rods 11, the outer walls of the threaded rods 11 are threadedly connected with sliding blocks 12, the top of the sliding block 12 is fixedly connected with the top of the inner groove seat 16, the sliding blocks 12 are slidingly connected with the surface of the base table 1, one end of the threaded rod 11 is fixedly connected with a motor 13, and the motor 13 is fixedly installed on the top of the base table 1.

[0045] When working: when the driving assembly is used, the motor 13 is started, and the motor 13 drives the threaded rod 11 to rotate in the inner wall of the baffle 10. When the threaded rod 11 rotates, the rotating force applied to the sliding block 12 is converted into a horizontal driving force due to the sliding connection between the sliding block 12 and the base table 1, so that the sliding block 12 moves horizontally along the surface of the base table 1, thereby driving the entire pen rack table 2 and the pencil 24 to move horizontally through the inner groove seat 16, so that the pencil tip of the pencil 24 gradually scratches the surface of the sample plate 6 for testing.

[0046] As shown in Figures 8 to 9 , the bottom of the sample plate 6 is provided with a clamping plate table 25, the bottom of the clamping plate table 25 is fixedly connected with a bottom sliding block 26, the bottom sliding block 26 is slidingly connected with the surface of the base table 1, the top of the base table 1 is symmetrically fixedly connected with a top plate 27, the top plate 27 is fixedly connected with a fixed connecting rod 28, the bottom sliding block 26 is slidingly connected with the fixed connecting rod 28, one side of the clamping plate table 25 is fixedly connected with a handle 29, the handle 29 is slidingly connected with the inner wall of one of the top plates 27, and the side surface of the bottom sliding block 26 is provided with a clamping assembly for limiting the bottom sliding block 26.

[0047] When working: after the pencil 24 completes a horizontal movement and leaves a scratch on the edge of the surface of the sample plate 6, the angle of the pencil 24 needs to be adjusted, and the handle 29 is pulled to move the sample plate 6 to the side through the clamping plate table 25, so that a new area on the surface of the sample plate 6 moves to the position where the pencil 24 will cause a scratch next time. When the clamping plate table 25 moves, the bottom sliding block 26 slides along the surface of the fixed connecting rod 28 for sliding guidance to prevent position deviation. After the handle 29 is pulled each time, the clamping assembly not only allows the bottom sliding block 26 to remain in the current position, but also allows the clamping plate table 25 to move a same distance to the side each time the handle 29 is pulled. Therefore, the distance between the scratches left by the pencil 24 on the surface of the sample plate 6 is equal, the clamping assembly automatically locks the current position and ensures that the single displacement amount is constant, the adjacent scratch intervals are consistent, and subsequent comparison and evaluation are facilitated.

[0048] As shown in Figures 8 to 9 , the clamping assembly includes two connecting blocks 31, one side of each of the two connecting blocks 31 is fixedly connected with a connecting spring 30, the connecting spring 30 is fixedly connected to the side surface of the bottom sliding block 26, the surface of the base table 1 is symmetrically slidingly connected with a clamping table 32, the surface of the clamping table 32 is provided with a plurality of clamping grooves 33, and one side of the connecting block 31 is a bevel.

[0049] When working: when pulling the handle 29, the bottom sliding block 26 slides horizontally along the surface of the base table 1, synchronously driving the two side connecting blocks 31 to move towards the clamping table 32, when the inclined surface of the connecting block 31 contacts with the edge of the clamping groove 33 on the clamping table 32, the inclined surface converts the horizontal thrust into vertical component force, forcing the connecting spring 30 to be compressed and shrink, so that the connecting block 31 smoothly slides into the clamping groove 33. After the connecting block 31 completely passes through the clamping groove 33, the connecting spring 30 releases the elastic potential energy to push the connecting block 31 to reset, at this time, the worker can feel obvious mechanical clamping feedback, so as to facilitate the worker to control the force of pulling the handle 29, avoid excessive force causing the displacement of the sample plate 6, and prevent insufficient force causing the connecting block 31 not to be completely clamped into the clamping groove 33, and ensure that the displacement amount is constant after each pulling.

[0050] As shown in Figures 8 to 9 , the plurality of clamping grooves 33 are equidistantly arranged.

[0051] When working: since the plurality of clamping grooves 33 are equidistantly arranged, it is ensured that the displacement amount of the bottom sliding block 26 after each pulling is strictly equal to the interval of the adjacent clamping grooves 33, and the clamping feedback helps the operator to perceive the displacement to be in place, and finally realizes the equal-precision control of the scratch interval on the surface of the sample plate 6.

[0052] As shown in Figures 8 to 9 , one side of the clamping table 32 is fixedly connected with the telescopic rod two 34, the telescopic rod two 34 is fixedly connected to the surface of the base table 1, and the side surface of the bottom sliding block 26 and one side of one of the top plates 27 are fixedly connected with the return spring 35.

[0053] When working: after completing all the tests, the connecting block 31 will be clamped into the inner wall of the last clamping groove 33, at this time, the clamping table 32 moves laterally through the telescopic rod two 34, the connecting block 31 is no longer clamped into the inner wall of the clamping groove 33, and the bottom sliding block 26 is reset to the original position through the return spring 35, then the clamping plate table 25 and the sample plate 6 are also reset to the initial position, at this time, the surface of the sample plate 6 appears equidistantly arranged multiple scratches, and the sample plate 6 can be removed to complete the whole process of this test.

[0054] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A pencil hardness tester comprising a base table, characterized by: The top of the base table is symmetrically provided with a pen rack table, the inner sides of the pen rack table are symmetrically provided with pencil clamping covers, a pencil is arranged between the two pencil clamping covers, the outer walls of the pencil clamping covers are fixedly connected with central shafts, the central shafts are movably connected with the inner walls of the pen rack table, the outer wall of the pen rack table is provided with a fastening assembly, the fastening assembly clamps and fixes the pencil by adjusting the spacing between the two pencil clamping covers, the top of the base table is fixedly connected with a correction table, one side of the correction table is provided with a sample plate, the top of the correction table is flush with the top of the sample plate, the outer side of the pen rack table is provided with a driving assembly for driving the pen rack table to move laterally, the side surface of the pen rack table is provided with a lifting assembly for adjusting the height of the pen rack table, and the side surface of the pencil clamping cover is provided with an adjusting assembly for adjusting the angle of the pencil clamping cover.

2. A pencil hardness gauge according to claim 1, characterized in that: The fastening assembly comprises two groups of arc-shaped sliding rails, the arc-shaped sliding rails are fixedly installed on the inner walls of the pen rack table, the inner walls of the arc-shaped sliding rails are slidably connected with arc-shaped resilient sliding blocks, and the inner walls of the arc-shaped resilient sliding blocks are threadedly connected with screw rods.

3. A pencil hardness gauge according to claim 2, wherein: The lifting assembly comprises two receiving plates, the receiving plates are fixedly connected with the outer walls of the pen rack table, one side of each receiving plate is fixedly connected with a sliding block two, the outer wall of each sliding block two is slidably connected with an inner groove seat, the inner wall surface of each inner groove seat is fixedly connected with an extension rod one, and the bottom end of each extension rod one is fixedly connected with the top of the sliding block two.

4. A pencil hardness gauge according to claim 3, wherein: The adjusting assembly comprises a push rod, the push rod is attached to the bottom of the pencil clamping cover, the outer wall of the push rod is fixedly connected with a connecting rod, one end of the connecting rod is fixedly connected with a moving block, the moving block is provided with moving assemblies on both sides, and the moving assemblies drive the moving block to move laterally.

5. A pencil hardness gauge according to claim 4, wherein: The moving assembly comprises two side connecting tables, the side connecting tables are fixedly connected with the side walls of the pen rack table, the side connecting tables are fixedly connected with a sliding rod frame between the pen rack table, the surface of the side connecting table is slidably connected with an electric sliding block, and the electric sliding block is slidably connected with the sliding rod frame.

6. A pencil hardness gauge according to claim 5, characterized in that: The driving assembly comprises two baffle plates one, the baffle plates one are fixedly installed on the top of the base table, the inner walls of the baffle plates one are rotatably connected with threaded rods, the outer walls of the threaded rods are threadedly connected with sliding blocks one, the top of each sliding block one is fixedly connected with the top of the inner groove seat, each sliding block one is slidably connected with the surface of the base table, one end of each threaded rod is fixedly connected with an electric motor, and the electric motor is fixedly installed on the top of the base table.

7. A pencil hardness gauge according to claim 6, characterized in that: The bottom of the sample plate is provided with a clamping plate table, the bottom of the clamping plate table is fixedly connected with a bottom sliding block, the bottom sliding block is slidably connected with the surface of the base table, the top of the base table is symmetrically fixedly connected with top plates, the top plates are fixedly connected with a fixed connecting rod, the bottom sliding block is slidably connected with the fixed connecting rod, one side of the clamping plate table is fixedly connected with a handle, the handle is slidably connected with the inner wall of one of the top plates, and the side surface of the bottom sliding block is provided with a clamping assembly for limiting the bottom sliding block.

8. A pencil hardness gauge according to claim 7, characterized in that: The clamping assembly comprises two connecting blocks, one side of each connecting block is fixedly connected with a connecting spring, the connecting spring is fixedly connected with the side surface of the bottom sliding block, the surface of the base table is symmetrically slidably connected with a clamping table, the surface of the clamping table is provided with a plurality of clamping grooves, and one side of the connecting block is a slope.

9. A pencil hardness gauge according to claim 8, characterized in that: The plurality of clamping grooves are arranged at equal intervals.

10. A pencil hardness gauge according to claim 9, characterized in that: One side of the clamping table is fixedly connected with telescopic rod two, the telescopic rod two is fixedly connected to the surface of the base table, and the side surface of the bottom sliding block is fixedly connected with the return spring between one side of the top plate.

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