Paint film pencil hardness testing machine

Abstract

The utility model relates to the technical field of paint film testing, in particular to a paint film pencil hardness testing machine which comprises a rack, a weight supporting rod, a threaded handle, a pencil inserting barrel, an X-axis sliding table and an adjusting assembly, the weight supporting rod is fixedly connected to the outer side of the top of the rack, and the pencil inserting barrel is installed at the top of the rack and used for sleeving a pencil; the threaded handle is in threaded connection with the interior of the pencil inserting barrel and used for abutting against the pencils, the X-axis sliding table is movably connected to the surface of the rack, and the adjusting assembly is slidably connected to the upper end of the X-axis sliding table in a sleeving mode. According to the paint film pencil hardness testing machine, after the frosted pressing plate is lifted up, a paint film test piece is placed below the frosted pressing plate, and the two groups of calibration brackets can be flexibly adjusted according to the size of the test piece, so that the process of manually screwing quadrangular screws for mounting and dismounting is omitted, and the paint film pencil hardness testing machine is convenient to use; and the transmission mode is a gear meshing type transmission structure to complete stable movement of the X-axis sliding table, the gear transmission precision is high, and errors are small.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of paint film testing, in particular to a paint film pencil hardness testing machine. BACKGROUND

[0002] The paint film pencil hardness testing machine is a device for evaluating the hardness of a coating film. The higher the hardness of the coating film, the better the scratch resistance. During testing, a pencil with gradually increasing hardness (such as a pencil with multiple different hardness levels from soft to hard) is pressed at a 45° angle on the surface of the coating film under a specified load (such as 500g, 750g, 1000g, etc.). The hardness of the pencil is gradually increased until the paint film exhibits plastic deformation or cohesive failure defects.

[0003] According to the search, the publication number CN210198883U discloses a paint film pencil scratch hardness tester. The pencil is fixed in the pencil hole, and then fixed by the abutting bolt. The test piece is pressed on the workbench by the pressing part, the weight is fixed on the weight rod, the pencil is abutted on the test piece, the motor is turned on to drive the workbench to move at a constant speed, the pencil scratch is left, and the test process is recorded without manual rotation of the workbench.

[0004] According to the related technology in the above, the inventors believe that there are the following technical defects to be improved:

[0005] Although this device eliminates the process of manually pushing the workbench, the internal mechanical transmission of this device is completed through a conveyor belt. The flexibility of the belt in the belt transmission also brings many problems. During the transmission process, the belt will be subjected to more wear and fatigue, which will cause the driving system to vibrate and shake, thereby reducing the stability of the workbench. In addition, the traditional device generally uses four-corner threaded installation to fix the test piece, which is not convenient to disassemble. CONTENT OF THE INVENTION

[0006] The application provides a paint film pencil hardness testing machine to improve the following technical problems:

[0007] The internal mechanical transmission of the traditional device is completed through a conveyor belt. The flexibility of the belt in the belt transmission also brings many problems. During the transmission process, the belt will be subjected to more wear and fatigue, which will cause the driving system to vibrate and shake, thereby reducing the stability of the workbench. In addition, the traditional device generally uses four-corner threaded installation to fix the test piece, which is not convenient to disassemble.

[0008] The application provides a paint film pencil hardness testing machine, which adopts the following technical solutions:

[0009] A kind of paint film pencil hardness tester, including adjustable hardness tester, the adjustable hardness tester includes rack, weight support rod, threaded handle, pencil insert tube, X-axis sliding table and adjusting assembly, the weight support rod is fixedly connected at the top outer side of the rack, the pencil insert tube is installed at the top of the rack for setting pencil, the threaded handle is threadedly connected in the inside of pencil insert tube for pressing against pencil, the X-axis sliding table is movably connected on the surface of the rack, the adjusting assembly is slidably connected on the upper end of the X-axis sliding table, the inside of the rack is also provided with stable transmission assembly.

[0010] In an implementation of the present application, the stable transmission assembly includes a positioning frame, a push bracket, a stepper motor, a locking gear and an embedded rack, the embedded rack is installed on the inner side of the positioning frame, the positioning frame is installed in the inside of the rack, the push bracket is slidably connected on the outer side of the positioning frame, the stepper motor is installed on the top of the push bracket, one end of the locking gear is fixedly connected with the motor shaft of the stepper motor through a shaft coupling, and the external teeth of the locking gear are engaged with the embedded rack.

[0011] In an implementation of the present application, the adjusting assembly includes a calibration bracket, a sanding pressure plate and a compression spring, the calibration bracket is slidably connected on both sides of the X-axis sliding table, the sanding pressure plate is slidably connected on the inner top side of the calibration bracket for pressing the paint film test piece, and the opposite side surfaces of the calibration bracket and the sanding pressure plate are fixedly connected with the two ends of the compression spring.

[0012] In an implementation of the present application, the bottom of the X-axis sliding table is further provided with a sliding block, and the bottom surface of the sliding block is fixedly connected with one side of the push bracket.

[0013] In an implementation of the present application, the bottom of the sliding block is further provided with a guide sliding table.

[0014] In an implementation of the present application, the inside of the X-axis sliding table is provided with a limiting groove with a thickness matching the bottom of the calibration bracket.

[0015] In summary, the present application has at least one of the following beneficial technical effects:

[0016] 1. The product is of spring pressing structure, when operating, the paint film test piece can be placed under the sanding pressure plate after lifting the sanding pressure plate, and the two calibration brackets can be flexibly adjusted according to the size of the test piece, which eliminates the process of manually screwing the four corner screws for installation and disassembly, and is convenient to use.

[0017] 2. The product is a gear mesh transmission structure to complete the stable movement of the X-axis sliding table, the gear transmission has high precision and small error, and does not cause elastic deformation and sliding problems due to the tightness of the traditional belt transmission, thereby improving the stability of translation. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 is a structure diagram of a paint film pencil hardness tester of the embodiment of the present application.

[0020] Figure 2 is a cutaway view of the inside of the rack in the embodiment of the present application.

[0021] Figure 3 is a structure diagram of a guide sliding table in the embodiment of the present application.

[0022] Figure 4 is a distribution diagram of a stepping motor and a locking gear in the embodiment of the present application.

[0023] Figure 5 is a cutaway view of a calibration support in the embodiment of the present application.

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025] 1. adjustable hardness tester; 2. stable transmission assembly; 3. sliding block; 4. guide sliding table; 5. limiting groove; 6. limiting switch; 11. rack; 12. weight support rod; 13. threaded handle; 14. pencil insertion cylinder; 15. X-axis sliding table; 16. adjusting assembly; 21. positioning frame; 22. pushing support; 23. stepping motor; 24. locking gear; 25. embedded rack; 161. calibration support; 162. frosted pressing plate; 163. compression spring. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects of the present application more clear, the present application will be further described in detail in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0027] It should be noted that when an element is referred to as being "fixed" or "set" on another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or indirectly connected to the other element.

[0028] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0029] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0030] The following will be described in detail in combination with the accompanying drawings. Figures 1-5 The present application will be further described in detail.

[0031] The present application discloses a paint film pencil hardness tester. Referring to Figures 1-5 The paint film pencil hardness tester comprises an adjustable hardness tester 1, the adjustable hardness tester 1 comprises a rack 11, a weight support rod 12, a threaded handle 13, a pencil insertion sleeve 14, an X-axis sliding table 15 and an adjusting assembly 16, the weight support rod 12 is fixedly connected to the top outer side of the rack 11, the pencil insertion sleeve 14 is installed on the top of the rack 11 for sleeving a pencil, the threaded handle 13 is threadedly connected in the interior of the pencil insertion sleeve 14 for abutting against the pencil, the X-axis sliding table 15 is movably connected to the surface of the rack 11, the adjusting assembly 16 is slidingly sleeved on the upper end of the X-axis sliding table 15, and the interior of the rack 11 is further provided with a stable transmission assembly 2.

[0032] The stable transmission assembly 2 comprises a positioning frame 21, a pushing bracket 22, a stepping motor 23, a locking gear 24 and an embedded rack 25, the embedded rack 25 is installed on the inner side of the positioning frame 21, the positioning frame 21 is installed in the interior of the rack 11, the pushing bracket 22 is slidingly sleeved on the outer side of the positioning frame 21, the stepping motor 23 is installed on the top of the pushing bracket 22, one end of the locking gear 24 is fixedly connected with the motor shaft of the stepping motor 23 through a shaft coupling, and the outer teeth of the locking gear 24 are engaged with the embedded rack 25.

[0033] The adjusting assembly 16 comprises calibration supports 161 slidably connected on both sides of the X-axis sliding table 15, a sanding pressure plate 162 slidably connected on the top inner side of the calibration supports 161 for pressing the paint film test piece, and compression springs 163 fixedly connected at both ends with the opposite side surfaces of the calibration supports 161 and the sanding pressure plate 162.

[0034] The bottom of the X-axis sliding table 15 is further provided with sliding blocks 3, and the bottom surfaces of the sliding blocks 3 are fixedly connected with one side of the pushing supports 22.

[0035] The guiding sliding tables 4 are further installed below the sliding blocks 3.

[0036] The X-axis sliding table 15 is internally provided with limiting grooves 5 with a thickness matching that of the calibration supports 161.

[0037] The use process of the paint film pencil hardness tester according to the embodiment is as follows:

[0038] During operation, the pencil can be inserted into the rack 11 at an angle of 45° from the pencil insertion barrel 14 until the pencil tip contacts the paint film, then the threaded handle 13 is twisted to tightly fix the pencil, then the sanding pressure plate 162 is lifted by hand, the paint film is placed in the gap between the X-axis sliding table 15 and the sanding pressure plate 162, the calibration supports 161 at the upper end are adjusted according to the size of the paint film piece until the two sets of calibration supports 161 are adjusted to the two ends of the paint film piece, then the sanding pressure plate 162 is lowered, and the internal paint film piece is tightly abutted under the elastic holding of the compression spring 163; the step motor 23 is started to drive the locking gear 24 to rotate, the pushing supports 22 can drive the X-axis sliding table 15 at the upper end to move through the connected sliding blocks 3, and the movement of the X-axis sliding table 15 is more stable under the limiting effect of the guiding sliding tables 4 at the lower end of the other set of sliding blocks 3, the pencil scratch is left, and the weight is sleeved on the weight support rod 12 to press on the paint film surface at an angle of 45° under the specified load, the pencil hardness is gradually increased until the paint film appears plastic deformation or cohesive failure defects.

[0039] The paint film pencil hardness tester according to the embodiment has the following beneficial technical effects:

[0040] The product is a spring compression type structure, when operating, the abrasive plate 162 is lifted, and the paint film test piece is placed below, and two sets of calibration supports 161 can be flexibly adjusted according to the size of the test piece, so that the process of manually screwing the four corner screws for installation and disassembly is avoided, and the use is convenient; and the device is a gear meshing type transmission structure to complete the stable movement of the X-axis sliding table 15, the gear transmission has high precision and small error, and the elastic deformation and sliding problem caused by the tightness of the traditional belt transmission is avoided, and the stability of the translation is improved, the limit switch 6 is installed on the upper end of the rack 11 to control the stroke of the X-axis sliding table 15, and the paint film piece is prevented from being damaged due to excessive stroke.

[0041] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the application should be included in the protection scope of the present application.

Claims

1. A paint film pencil hardness tester characterized by, Including adjustable hardness testing machine (1), the adjustable hardness testing machine (1) includes rack (11), weight support rod (12), threaded handle (13), pencil insert tube (14), X-axis sliding table (15) and adjusting assembly (16), the weight support rod (12) is fixedly connected on the top outer side of the rack (11), the pencil insert tube (14) is installed on the top of the rack (11) for setting pencil, the threaded handle (13) is threadedly connected inside the pencil insert tube (14) for abutting tightly pencil, the X-axis sliding table (15) is movably connected on the surface of the rack (11), the adjusting assembly (16) is slidably connected on the upper end of the X-axis sliding table (15), the inside of the rack (11) is further provided with stable transmission assembly (2); The stable transmission assembly (2) includes positioning frame (21), push support (22), stepper motor (23), locking gear (24) and embedded rack (25), the embedded rack (25) is installed on the inner side of the positioning frame (21), the positioning frame (21) is installed in the inside of the rack (11), the push support (22) is slidably connected on the outer side of the positioning frame (21), the stepper motor (23) is installed on the top of the push support (22), one end of the locking gear (24) is fixedly connected with the motor shaft of the stepper motor (23) through the shaft coupling, and the outer teeth of the locking gear (24) are engaged with the embedded rack (25).

2. The paint film pencil hardness tester of claim 1, wherein, The adjusting assembly (16) includes calibration support (161), sanding pressure plate (162) and compression spring (163), the calibration support (161) is slidably connected on both sides of the X-axis sliding table (15), the sanding pressure plate (162) is slidably connected on the top inner side of the calibration support (161) for pressing the paint film test piece, and the opposite side surfaces of the calibration support (161) and the sanding pressure plate (162) are fixedly connected with the two ends of the compression spring (163).

3. The paint film pencil hardness tester of claim 1, wherein, The bottom of the X-axis sliding table (15) is further provided with a sliding block (3), and the bottom surface of the sliding block (3) is fixedly connected with one side of the push support (22).

4. The paint film pencil hardness tester of claim 3, wherein, The guiding sliding table (4) is further installed below the sliding block (3).

5. The paint film pencil hardness tester of claim 2, wherein, The inside of the X-axis sliding table (15) is provided with a limiting groove (5) with a thickness matching the bottom of the calibration support (161). The inside of the X-axis sliding table (15) is provided with a limiting groove (5) with a thickness matching the bottom of the calibration support (161).

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