A pencil hardness gauge for measuring paint film hardness

Abstract

The utility model discloses a kind of pencil measurement's lacquer film hardness gauge, it is related to the technical field of hardness gauge, including main body, gyro wheel and level, gyro wheel is symmetrically set in the two sides of main body, gyro wheel can rotate relative to main body, level is set on the upper surface of main body, several pencil holes are set on main body, the lead of pencil can be linear contact or point contact with film plane or the plane to be measured by penetrating pencil hole, pencil can be connected in pencil hole, pencil hole is located in the one side of gyro wheel's rotation center line, the rotation center of gyro wheel is equivalent to fulcrum of lever, main body forms a front heavy rear light lever, and the heavy end of main body is supported up by pencil, and each pencil hole corresponds the support force needed to make the upper surface of main body horizontal. The embodiment utilizes lever principle to set pencil hole of different position on the same main body to realize different test pressure, can directly select appropriate pencil hole for hardness test according to needs, convenient to use, convenient to operate.

Description

Technical Field

[0001] This utility model relates to the technical field of hardness testers, and in particular to a paint film hardness tester that uses a pencil for measurement. Background Technology

[0002] A pencil hardness tester is a mechanical device with a tip capable of bearing a load of 1000±5g. It uses the hardness rating of a pencil to determine the hardness of a coating. Its advantages include small size and light weight, making it convenient for hardness testing in laboratories and on-site. The pencil hardness tester belongs to the scratch hardness testing instrument category and can be used to measure the surface hardness of coatings. The measurement is simple and rapid; it detects hardness by applying pressure with a sharp pencil tip to scratch the coating. It can also be used during the production process, such as for testing the hardness of coil coatings.

[0003] Currently, paint film hardness testers on the market that use pencils only have one pencil mounting hole. During different hardness measurements, an external weight is needed to change the test pressure, making them very inconvenient to use. Utility Model Content

[0004] The purpose of this invention is to provide a paint film hardness tester that uses a pencil to measure hardness, thereby solving the problems existing in the prior art and making it convenient and easy to use without the need for an external weight during hardness testing.

[0005] To achieve the above objectives, this utility model provides the following solution:

[0006] This utility model provides a paint film hardness tester for measuring with a pencil, including a main body, rollers, and a level. The rollers are symmetrically arranged on both sides of the main body and can rotate relative to the main body. The level is disposed on the upper surface of the main body. The main body has a plurality of pencil holes, through which the lead of the pencil can pass and make linear or point contact with the coating plane or the plane to be measured. The pencil can be engaged in the pencil holes. The pencil holes are located on one side of the rotation center line of the rollers, and each pencil hole corresponds to the support force required to keep the upper surface of the main body in a horizontal state.

[0007] Preferably, the main body is a cuboid metal block, the pencil hole penetrates the upper and lower surfaces of the main body, and the rollers are symmetrically arranged on both sides of the main body.

[0008] Preferably, each of the pencil holes is arranged along the center line of the main body, and the straight line of the arrangement of the pencil holes is perpendicular to the rotation center line of the roller.

[0009] Preferably, there are three pencil holes arranged in parallel, and from front to back they correspond to load capacities of 500g, 750g and 1000g respectively.

[0010] Preferably, each of the pencil holes is set at a 45° angle to the horizontal plane; the diameter of each of the pencil holes is 8 mm.

[0011] Preferably, each of the pencil holes is provided with a locking component, the locking component including a locking hole and a locking bolt, the locking hole communicating with the corresponding pencil hole, the locking bolt being threaded into the locking hole, and the inner end of the locking bolt being able to abut against the pencil shaft.

[0012] Preferably, the locking hole is a stepped through hole at both ends, the stepped through holes are symmetrically arranged on both sides of the pencil hole, the locking bolt is a stepped shaft, and the large diameter shaft of the stepped shaft is provided with threads, the end face of the small diameter shaft abuts against the pencil, and the outer end of the locking bolt is provided with a Torx nut.

[0013] Preferably, a movable support leg is provided on the front side of the main body. The movable support leg includes a rotating block, a support column, and a stepped rotating shaft. The small end of the stepped rotating shaft is threadedly connected to the front side of the main body, and the rotating block is rotatably sleeved on the large end. The rotating block is threadedly connected to the support column along the radial direction of the stepped rotating shaft. The end of the support column is flat and can make surface contact with the flat surface or the plane to be measured. The length of the support column can be adjusted to keep the upper surface of the main body horizontal.

[0014] Preferably, the rotating block is an annular block, and a limiting nut is provided on the large end of the stepped rotating shaft. The rotating block is located between the limiting nut and the main body. A positioning pin is passed through the rotating block, and the inner end of the positioning pin protrudes from the inner end face of the rotating block. A rotatable gap is provided between the rotating block and the main body. The protruding length of the positioning pin is not greater than the width of the gap. The axis of the positioning pin is parallel to the axis of the stepped rotating shaft. A horizontal positioning groove and a vertical positioning groove are provided on the front side of the main body. The protruding end of the positioning pin can be engaged in the horizontal positioning groove or the vertical positioning groove. Both the horizontal positioning groove and the vertical positioning groove are hemispherical grooves. A handle is provided on the front or rear side of the main body. The handle includes a ball-head handle and a limiting sleeve. The rod end of the ball-head handle is threaded to the main body, and the limiting sleeve is sleeved on the rod end of the ball-head handle.

[0015] Preferably, the roller includes a fixed hub, a limiting plate, and a rolling ring. The fixed hub is in the shape of a circular groove. The bottom of the groove of the fixed hub is threaded to the side of the main body, and the limiting plate is engaged at the groove opening. The rolling ring is rotatably sleeved on the fixed hub. The rolling ring is located between the limiting plate and the main body. The rolling ring has an annular groove along its circumference. A rubber pad is sleeved in the annular groove, and the rubber pad protrudes from the surface of the rolling ring.

[0016] Preferably, a waist-shaped hole is provided in the middle of the fixed hub, and the main body is connected to the waist-shaped hole by bolts, wherein the bolts can move 3mm-8mm in the waist-shaped hole.

[0017] The present invention achieves the following technical advantages over the prior art:

[0018] This invention treats the main body and roller as a lever, and uses the lever principle to set pencil holes at different positions on the same main body to achieve different test pressures. The appropriate pencil hole for hardness testing can be directly selected as needed. No external weight is required during use, making it convenient and easy to use. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the paint film hardness tester measured with a pencil in an embodiment of this utility model. Figure 1 ;

[0021] Figure 2 This is a schematic diagram of the structure of the paint film hardness tester measured with a pencil in an embodiment of this utility model. Figure 2 ;

[0022] Figure 3 This is a schematic diagram of the structure of the paint film hardness tester measured with a pencil in an embodiment of this utility model. Figure 3 ;

[0023] Figure 4 This is a schematic diagram of the structure of the paint film hardness tester measured with a pencil in an embodiment of this utility model. Figure 4 ;

[0024] Figure 5 As an embodiment of this utility model Figure 4 Schematic diagram of the structure of AA;

[0025] Figure 6 As an embodiment of this utility model Figure 4 Schematic diagram of the structure of BB;

[0026] Figure 7 This is a schematic diagram illustrating the installation and use of the paint film hardness tester measured with a pencil in an embodiment of this utility model.

[0027] Figure 8 This is a pencil hardness chart.

[0028] In the diagram: 1-Main body, 2-Roller, 3-Level, 4-Pencil hole, 5-Locking hole, 6-Locking bolt, 7-Rotating block, 8-Stepped shaft, 9-Support column, 10-Positioning pin, 11-Vertical positioning groove, 12-Horizontal positioning groove, 13-Ball head handle, 14-Limit sleeve, 15-Fixed hub, 16-Limit plate, 17-Rolling ring, 18-Rubber pad, 19-Oval hole, 20-Pencil, 21-Planar to be measured. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "clockwise," and "counterclockwise," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," "third," and "fourth" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] The purpose of this invention is to provide a paint film hardness tester that uses a pencil to measure hardness, thereby solving the problems existing in the prior art. This makes it convenient and easy to use, eliminating the need for an external weight during hardness testing.

[0033] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Example 1

[0035] like Figures 1 to 8 As shown, this embodiment provides a paint film hardness tester that uses a pencil for measurement, including a main body 1, a roller 2, and a level 3. The roller 2 is symmetrically arranged on both sides of the main body 1 and can rotate relative to the main body 1. The level 3 is set on the upper surface of the main body 1. The main body 1 is provided with a plurality of pencil holes 4. The lead of the pencil 20 can pass through the pencil hole 4 and make linear or point contact with the coating plane or the plane to be measured 21, preferably point contact. The pencil 20 can be locked in the pencil hole 4. The pencil hole 4 is located on one side of the rotation center line of the roller 2, so that the rotation center of the roller 2 is equivalent to the fulcrum of the lever. The main body 1 forms a lever that is heavier in the front and lighter in the back. The heavy end of the main body 1 is supported by the pencil 20, and each pencil hole 4 corresponds to the supporting force required to keep the upper surface of the main body 1 in a horizontal state. This embodiment utilizes the lever principle to set pencil holes 4 at different positions on the same main body 1 to achieve different test pressures. The appropriate pencil hole 4 for hardness testing can be directly selected as needed. No external weight is required during use, making it convenient and easy to operate. The bottom surface of the mounting groove of the level 3 is parallel to the main body 1, ensuring that the main body 1 is horizontal during measurement and will not be biased, thus ensuring that the lead core of the pencil 20 is subjected to uniform force during measurement.

[0036] As an optional solution, in this embodiment, the main body 1 is a cuboid metal block, which can be made of 45# steel. The pencil hole 4 penetrates the upper and lower surfaces of the main body 1, and the rollers 2 are symmetrically arranged on both sides of the main body 1. In this embodiment, the main body 1 can also be other shapes, mainly with the end where the rollers 2 are located as the rear, the end away from the rollers 2 as the front, and the surface where the rollers 2 are located as the side. In this embodiment, a cuboid shape is preferred, which facilitates the determination of different test pressure positions and makes leveling easier.

[0037] As an optional solution, in this embodiment, each pencil hole 4 is arranged along the center line of the main body 1, and the straight line of the pencil holes 4 is set perpendicular to the rotation center line of the roller 2, which facilitates uniform force distribution and improves the accuracy of the test.

[0038] As an optional solution, in this embodiment, three pencil holes 4 are arranged in parallel, and from front to back, they correspond to load capacities of 500g, 750g, and 1000g, respectively. Different load capacities can be selected according to the material and thickness of the coating plane or the test plane 21 to meet the testing requirements.

[0039] As an optional solution, in this embodiment, each pencil hole 4 is set at a 45° angle to the horizontal plane, which facilitates point contact between the lead of the pencil 20 and the coating plane or the plane to be tested 21; the diameter of each pencil hole 4 is 8mm.

[0040] As an optional solution, each pencil hole 4 in this embodiment is provided with a locking component, which includes a locking hole 5 and a locking bolt 6. The locking hole 5 communicates with the middle of the corresponding pencil hole 4, and the locking bolt 6 is threaded into the locking hole 5. The inner end of the locking bolt 6 can abut against the pencil barrel of the pencil 20. In this embodiment, the pencil barrel is locked in the pencil hole 4 by the inner end of the locking bolt 6 abutting against the pencil barrel of the pencil 20. If the locking bolt 6 is not used, a paper sleeve can also be wrapped around the pencil 20 and snapped into the pencil hole 4 to lock the pencil 20.

[0041] As an optional solution, in this embodiment, the locking hole 5 is a stepped through hole with larger outer diameter and smaller inner diameter at both ends. The smaller section of the stepped through hole has an internal thread for mating with the locking bolt 6, which avoids paint spraying onto the internal thread. The stepped through holes are symmetrically arranged on both sides of the pencil hole 4. The locking bolt 6 is a stepped shaft with an external thread in the middle. The locking holes 5 symmetrically arranged on both sides of the main body 1 have the same function. If the locking hole 5 on one side is stripped, the locking hole 5 on the other side can be used. The larger diameter shaft of the stepped shaft has a thread, and the end face of the smaller diameter shaft abuts against the pencil 20. The outer end of the locking bolt 6 is provided with a Torx nut or a toothed nut for easy manual tightening of the locking bolt 6.

[0042] As an optional solution, in this embodiment, a movable support leg is provided on the front side of the main body 1. The movable support leg includes a rotating block 7, a support column 9, and a stepped rotating shaft 8. The small end of the stepped rotating shaft 8 is threadedly connected to the front side of the main body 1, and the rotating block 7 is rotatably sleeved on the large end. The rotating block 7 is threadedly connected to the support column 9 along the radial direction of the stepped rotating shaft 8. The support column 9 is threaded, and its extension length can be adjusted through the thread. The end of the support column 9 is flat and can make surface contact with the coating plane or the plane to be measured 21. The length of the support column 9 can be adjusted to keep the upper surface of the main body 1 horizontal. In this embodiment, the rotating block 7 can be square, round, hexagonal, or other shapes. By rotating the rotating block 7, during the installation of the pencil 20 on the main body 1, the support column 9 can make surface contact with the coating plane or the plane to be measured 21 to achieve leveling and ensure that the upper surface of the main body 1 is horizontal after the pencil 20 is installed.

[0043] As an optional solution, in this embodiment, the rotating block 7 is an annular block, and a limiting nut is provided on the large end of the stepped rotating shaft 8. The rotating block 7 is located between the limiting nut and the main body 1. A positioning pin 10 is passed through the rotating block 7. The inner end of the positioning pin 10 protrudes from the inner end face of the rotating block 7. A rotatable gap is provided between the rotating block 7 and the main body 1. The protruding length of the positioning pin 10 is not greater than the width of the gap, so as to facilitate pulling the rotating block 7 outward to release the limiting. The axis of the positioning pin 10 is parallel to the axis of the stepped rotating shaft 8. A horizontal positioning groove 12 and a vertical positioning groove 11 are provided on the front side of the main body 1. The protruding end of the positioning pin 10 can be engaged in the horizontal positioning groove 12 or the vertical positioning groove 11. Both the horizontal positioning groove 12 and the vertical positioning groove 11 are hemispherical grooves, which facilitates the sliding out of the positioning pin 10. During the installation of the pencil 20 on the main body 1, the protruding end of the positioning pin 10 is engaged in the vertical positioning groove 11, so that the support column 9 makes surface contact with the coating plane or the test plane 21; when the pencil 20 is installed and tested, the protruding end of the positioning pin 10 is engaged in the horizontal positioning groove 12, so that the support column 9 is away from the coating plane or the test plane 21.

[0044] As an optional solution, in this embodiment, a handle is provided on the front or rear side of the main body 1. The handle includes a ball-head handle 13 and a limiting sleeve 14. The rod end of the ball-head handle 13 is threaded to the main body 1, and the limiting sleeve 14 is fitted onto the rod end of the ball-head handle 13. In this embodiment, the handle can serve as a force point for picking up the main body 1 or as a force point for pulling the main body 1.

[0045] As an optional embodiment, the roller 2 includes a fixed hub 15, a limiting plate 16, and a rolling ring 17. The fixed hub 15 is a circular groove, and the bottom of the groove is threaded to the side of the main body 1. The groove opening is engaged with the limiting plate 16. The rolling ring 17 is rotatably sleeved on the fixed hub 15, and the rolling ring 17 is located between the limiting plate 16 and the main body 1. The rolling ring 17 has an annular groove along its circumference, and a rubber pad 18 is sleeved inside the annular groove. The rubber pad 18 protrudes from the surface of the rolling ring 17 to avoid scratching the coating plane or the plane to be measured 21. When the main body is pushed, the rolling ring 17 and the rubber pad 18 roll on the coating plane or the plane to be measured 21.

[0046] As an optional solution, in this embodiment, a waist-shaped hole 19 is provided in the middle of the fixed hub 15. The main body 1 is connected to the waist-shaped hole 19 by bolts. The bolts can move 3mm-8mm, preferably 5mm, in the waist-shaped hole 19, which is equivalent to allowing the center position of the lever to be adjusted up and down and back and forth. Before measurement, each pencil hole 4 can be weighed and calibrated by a portable electronic scale to ensure the accuracy of the measurement data.

[0047] Example 2

[0048] like Figures 7 to 8 As shown in the figure, this embodiment provides a method for using a paint film hardness tester that measures with a pencil. The specific operation is as follows:

[0049] S1. Preparation: Use a pencil sharpener (or craft knife) to sharpen the pencil 20 until 5mm-6mm of the lead is exposed. Be careful not to loosen or damage the lead. Hold the pencil 20 at a 90° angle to the end of 400 grit sandpaper, and continuously rub the lead in circular motions until a smooth, sharp edge is achieved (the edge must not be broken or chipped). After each test use, rotate the pencil 20 180° before using it again, or resharpen it until it meets the requirements.

[0050] S2. According to the industry standard or national standard of each product, select the appropriate pencil hole 4 and install the pencil 20 on the main body 1. Rotate the rotating block 7 so that the protruding end of the positioning pin 10 is engaged in the vertical positioning groove 11, so that the support column 9 is in surface contact with the coating plane or the plane to be measured 21. Insert the pencil 20 into the pencil hole 4, so that the pencil 20 is in point contact with the coating plane or the plane to be measured 21. Manually tighten the corresponding locking bolt 6 to lock the pencil 20 in the pencil hole 4. Then rotate the rotating block 7 so that the protruding end of the positioning pin 10 is engaged in the horizontal positioning groove 12, so that the support column 9 is away from the coating plane or the plane to be measured 21.

[0051] S3. Carefully place the paint film hardness tester (measured with a pencil) of this embodiment onto the coating surface or the test surface 21. Place the roller 2 first, then the lead of the pencil 20. When placing the pencil 20, slowly lower it under the ball-head handle 13 with your index finger. Push the main body 1 with your index finger and / or thumb to rotate the roller 2 forward, pushing the main body 1 forward along the direction of the pencil tip at a speed of approximately 10 cm / s. During the test, carefully distinguish the pencil marks 20 from coating scratches. If necessary, the pencil marks 20 can be erased with a soft eraser. The number in the pencil model 20 represents the pencil hardness. For example, if two pencils have hardnesses of 2H and 3H respectively, the 2H pencil will usually only leave a pencil mark after testing, but the 3H pencil will leave a slight scratch on the coating surface. Determining pencil hardness requires experience. It is recommended to start testing with medium-soft or medium-hard pencils, and then narrow down the range to find the most suitable pencil 20, until you find a pencil 20 that can plow the coating surface or the test surface 21 without damaging the coating. The hardness of this pencil 20 represents the hardness of the test surface 21.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with the described embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0053] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A paint film hardness tester for measuring with a pencil, characterized in that: The device includes a main body, rollers, and a level. The rollers are symmetrically arranged on both sides of the main body and can rotate relative to the main body. The level is disposed on the upper surface of the main body. The main body has several pencil holes, through which the lead of a pencil can pass and make linear or point contact with the coating plane or the plane to be measured. The pencil can be engaged in the pencil holes. The pencil holes are located on one side of the rotation center line of the rollers, and each pencil hole corresponds to the supporting force required to keep the upper surface of the main body in a horizontal state. A movable support leg is provided on the front side of the main body. The movable support leg includes a rotating block, a support column, and a stepped rotating shaft. The small end of the stepped rotating shaft is threaded to the front side of the main body, and the rotating block is rotatably sleeved on the large end. The rotating block is threaded to the support column along the radial direction of the stepped rotating shaft. The end of the support column is flat and can make surface contact with the flat surface or the plane to be measured. The length of the support column can be adjusted to keep the upper surface of the main body horizontal. The roller includes a fixed hub, a limiting plate, and a rolling ring. The fixed hub is a circular groove. The bottom of the groove of the fixed hub is threaded to the side of the main body, and the limiting plate is engaged at the groove opening. The rolling ring is rotatably sleeved on the fixed hub. A waist-shaped hole is provided in the middle of the fixed hub. The main body is connected to the waist-shaped hole by bolts. The bolts can move 3mm-8mm in the waist-shaped hole.

2. The paint film hardness tester according to claim 1, characterized in that: The main body is a rectangular metal block, the pencil hole penetrates the upper and lower surfaces of the main body, and the rollers are symmetrically arranged on both sides of the main body.

3. The paint film hardness tester using a pencil according to claim 1, characterized in that: Each of the pencil holes is arranged along the center line of the main body, and the straight line of the arrangement of the pencil holes is perpendicular to the rotation center line of the roller.

4. The paint film hardness tester using a pencil according to claim 1, characterized in that: The pencil hole is arranged in three parallel rows, and from front to back, they correspond to load capacities of 500g, 750g, and 1000g, respectively.

5. The paint film hardness tester using a pencil according to claim 1, characterized in that: Each of the pencil holes is set at a 45° angle to the horizontal plane; the diameter of each of the pencil holes is 8 mm.

6. The paint film hardness tester according to claim 1, characterized in that: Each of the pencil holes is provided with a locking component, which includes a locking hole and a locking bolt. The locking hole communicates with the corresponding pencil hole, and the locking bolt is threaded into the locking hole. The inner end of the locking bolt can abut against the pencil shaft.

7. The paint film hardness tester using a pencil according to claim 6, characterized in that: The locking hole is a stepped through hole at both ends, which are symmetrically arranged on both sides of the pencil hole. The locking bolt is a stepped shaft, and the large-diameter shaft of the stepped shaft is threaded, while the end face of the small-diameter shaft abuts against the pencil. The outer end of the locking bolt is provided with a Torx nut.

8. The paint film hardness tester according to claim 1, characterized in that: The rotating block is an annular block. A limiting nut is provided on the large end of the stepped rotating shaft. The rotating block is located between the limiting nut and the main body. A positioning pin is passed through the rotating block. The inner end of the positioning pin protrudes from the inner end face of the rotating block. A rotatable gap is provided between the rotating block and the main body. The protruding length of the positioning pin is not greater than the width of the gap. The axis of the positioning pin is parallel to the axis of the stepped rotating shaft. A horizontal positioning groove and a vertical positioning groove are provided on the front side of the main body. The protruding end of the positioning pin can be engaged in the horizontal positioning groove or the vertical positioning groove. Both the horizontal positioning groove and the vertical positioning groove are hemispherical grooves. A handle is provided on the front or rear side of the main body. The handle includes a ball-head handle and a limiting sleeve. The rod end of the ball-head handle is threaded to the main body. The limiting sleeve is sleeved on the rod end of the ball-head handle.

9. The paint film hardness tester using a pencil according to claim 1, characterized in that: The rolling ring is located between the limiting plate and the main body. The rolling ring has an annular groove along its circumference. A rubber pad is fitted inside the annular groove and protrudes from the surface of the rolling ring.

Images