Device for testing hardness of paint film

Abstract

A paint film hardness testing device relates to the technical field of paint performance detection equipment, and comprises a bottom plate, a first rotating shaft, a second rotating shaft and a third rotating shaft, the clamping mechanism comprises a fixed part fixedly installed at one end of the bottom plate, two clamping parts oppositely arranged on the bottom plate in a sliding mode, an operation part rotationally installed on the fixed part and a transmission part arranged in the fixed part, and the power output end of the operation part freely penetrates into the fixed part to be connected with the transmission part; a one-way locking piece is arranged between the operating part and the fixing part, the two clamping parts are connected with the fixing part in a sliding mode, and one part of each clamping part freely penetrates into the fixing part to be connected with the power output end of the transmission part; the operating part drives the two clamping parts to move towards each other or away from each other through the transmission part, and the one-way locking piece is used for limiting the operating part to only freely rotate in the direction in which the two clamping parts are driven to move towards each other.

Description

Technical Field

[0001] The utility model relates to the technical field of coating performance testing equipment, in particular to a coating film hardness testing device. Background Art

[0002] Paint film hardness is the ability of a paint film to resist mechanical forces such as collision, indentation, and scratching, and is one of the important indicators of paint film performance. The main methods for testing paint film hardness include pencil hardness, pendulum hardness, indentation, and scratch testing. The scratch test is performed on a scratch tester. The test process is as follows: fix the test plate to the movable workbench on the instrument, turn on the instrument, and make the workbench move at a constant speed. The scratching needle on the instrument can then move across the test plate. Depending on the scratch condition, gradually add weights to the scratching needle until the paint film is just scratched. The minimum load when the paint film is scratched is used as the hardness value of the paint film.

[0003] In the Chinese utility model patent with authorization announcement number CN212748614U, a paint film hardness testing device is disclosed. The device is provided with a base, a drive chassis, a screw, a limit rod and a detection pen assembly, so that the drive chassis can drive the screw to rotate, and then drive the detection pen assembly to slide along the limit rod, and then the detection pen assembly is used to perform line detection on the part to be tested on the base.

[0004] Although the above patent can detect the hardness of the paint film, the above patent clamps the test piece by applying a force to the clamping plate through the elastic force of the spring in the clamping assembly. The clamping plate can easily be compressed by external force, making the clamping of the test piece loose. Moreover, during the testing process, the testing pen will generate sliding friction with the test piece, which can easily cause the test piece to move, thereby affecting the test results. Utility Model Content

[0005] In view of the deficiencies in the prior art, the present invention provides a paint film hardness testing device, which solves the problem in the prior art that the paint film hardness tester cannot firmly clamp the test piece.

[0006] A coating film hardness testing device, comprising:

[0007] a bottom plate, which is arranged horizontally; and

[0008] The clamping mechanism includes a fixed portion fixedly mounted on one end of the base plate, two clamping portions slidably mounted on the base plate, an operating portion rotatably mounted on the fixed portion, and a transmission portion disposed within the fixed portion, wherein a power output end of the operating portion freely penetrates into the fixed portion and is connected to the transmission portion, a one-way locking member is provided between the operating portion and the fixed portion, the two clamping portions are slidably connected to the fixed portion, and a portion of each clamping portion freely penetrates into the fixed portion and is connected to the power output end of the transmission portion;

[0009] The operating part drives the two clamping parts to move toward or away from each other through the transmission part, and the one-way locking member is used to limit the operating part to be able to rotate freely only in the direction of driving the two clamping parts to move toward each other.

[0010] Compared with the prior art, the present invention has the following beneficial effects: when in use, the workpiece to be tested is placed on the bottom plate and located between the two clamping parts, and then the two clamping parts are driven to move toward each other through the transmission part by rotating the operating part until the workpiece to be tested is clamped and fixed. Moreover, due to the action of the one-way locking part, the operating part can only rotate freely in the direction of driving the two clamping parts to move toward each other, thereby ensuring the stability of clamping the workpiece to be tested; the operation is simple and convenient, the workpiece to be tested can be clamped and fixed quickly, and the clamping is firm. It can also be suitable for clamping workpieces to be tested of different specifications, thereby improving the detection efficiency and ensuring the accuracy of the detection results.

[0011] Preferably, the transmission part includes a gear vertically rotatably installed in the fixed part and two racks meshing with the gear. The power output end of the operating part is freely inserted into the fixed part and connected to the gear. The two racks are located on the upper and lower sides of the gear. One part of the two clamping parts is freely inserted into the fixed part and connected to the two racks.

[0012] Preferably, the fixing part includes a fixing plate vertically fixedly installed at one end of the base plate, a cavity is opened in the fixing plate, and two strip-shaped holes are horizontally opened on the side wall connecting the fixing plate and the base plate, and the two strip-shaped holes are arranged parallel in the vertical direction. The gear and the two racks are located in the cavity, and the power output end of the operating part can freely penetrate into the cavity and be connected to the gear, and one part of the two clamping parts can freely pass through the two strip-shaped holes and be connected to the two racks.

[0013] Preferably, each of the clamping parts includes a splint slidably connected to the base plate, the splint is arranged perpendicular to the fixed plate, and a connecting plate is fixedly installed on the side wall of the splint close to the fixed plate. The connecting plate is slidably connected to the corresponding strip hole and can freely penetrate into the cavity and be fixedly connected to the corresponding rack.

[0014] Preferably, the operating part includes a knob rotatably mounted on a side of the fixed plate away from the bottom plate via a rotating shaft, the rotating shaft freely penetrates into the cavity and is coaxially fixedly connected to the gear, and the one-way locking member is arranged between the rotating shaft and the fixed plate.

[0015] Preferably, the one-way locking member includes a ratchet fixedly mounted on the rotating shaft and a pawl rotatably mounted on the side wall of the fixed plate through a connecting shaft. The ratchet and the pawl are engaged with each other, and a torsion spring is mounted on the connecting shaft, and the torsion spring is elastically connected between the pawl and the fixed plate.

[0016] Preferably, limiting grooves are provided on two opposing inner walls of the cavity in the vertical direction in a direction parallel to the strip-shaped hole, and the groove width of the limiting groove is smaller than the groove bottom width. A connecting block is fixedly installed on the side wall of the limiting groove arranged opposite to each rack, and a limiting block is provided between the connecting block and the limiting groove. The limiting block is a T-shaped structure, and the horizontal section of the limiting block is slidably engaged with the limiting groove, and the vertical section of the limiting block is freely passed through the limiting groove and fixedly connected to the connecting block.

[0017] Preferably, a support plate is vertically fixedly installed on the upper part of one end of the base plate away from the fixed plate, and a mounting plate is horizontally fixedly installed on the upper part of the end of the support plate away from the base plate. The mounting plate is located directly above the base plate, and an adjusting member and a detecting member are provided at the lower part of the mounting plate. The detecting member is movably connected to the adjusting member and is slidably connected to the mounting plate, and the adjusting member is used to drive the detecting member to slide in a direction perpendicular to the sliding track of the two splints.

[0018] Preferably, the mounting plate is an L-shaped structure, the free end of the vertical section of the mounting plate is fixedly connected to the support plate, the horizontal section of the mounting plate is arranged toward the base plate, the adjusting member includes a screw mounted horizontally between the horizontal section of the mounting plate and the support plate, and a motor fixedly mounted in the support plate, the screw freely penetrates into the support plate and is coaxially fixedly connected to the power output shaft of the motor, the detection member is threadedly connected to the screw and is slidingly connected to the vertical section of the mounting plate.

[0019] Preferably, the detection part includes a vertically arranged connecting sleeve, a sliding rod slidingly inserted between the inner and outer sides of the lower end of the connecting sleeve, a mounting block fixedly connected to one end of the sliding rod located outside the connecting sleeve, and a detection pen vertically fixedly installed on the lower part of the mounting block. The upper end of the connecting sleeve is slidingly connected to the vertical section of the mounting plate, the screw rod freely passes through the connecting sleeve and is threadedly connected to it, a locking bolt is threadedly installed on the side wall of the connecting sleeve, the locking bolt is used to resist the sliding rod, and a sleeve rod is vertically fixedly installed on the upper part of the mounting block, and the sleeve rod is used to install a weight.

[0020] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a front view of an embodiment of the utility model.

[0022] Figure 2 for Figure 1 Cross-sectional view in the AA direction.

[0023] Figure 3 for Figure 1 Cross-sectional view of the fixing plate.

[0024] Figure 4 for Figure 3 Cross-sectional view along the BB direction.

[0025] Figure 5 for Figure 1 Schematic diagram of the coordination of the middle ratchet pawl.

[0026] Figure 6 for Figure 1 Schematic diagram of the structure of the middle splint.

[0027] The numbers in the figure are: 1. Base plate; 11. Slide groove; 12. Leg; 2. Support plate; 3. Mounting plate; 31. Weight rack; 4. Fixed plate; 41. Cavity; 42. Bar hole; 43. Limiting groove; 44. Gear; 45. Rotating shaft; 46. Knob; 47. Rack; 48. Connecting block; 49. Limiting block; 5. Clamp; 51. Connecting plate; 52. Buffer pad; 53. Slider; 6. Ratchet; 61. Pawl; 62. Connecting shaft; 7. Screw; 8. Connecting sleeve; 81. Sliding rod; 82. Locking bolt; 9. Mounting block; 91. Sleeve rod; 92. Weight; 93. Detection pen. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, objectives and functions of the present invention clearer and easier to understand, the present invention is further described below with reference to the accompanying drawings and specific embodiments:

[0029] like Figure 1-3 As shown, an embodiment of the present invention provides a paint film hardness testing device, comprising: a base plate 1, which is arranged horizontally; and a clamping mechanism, which comprises a fixed part fixedly installed at one end of the base plate 1, two clamping parts slidably arranged on the base plate 1, an operating part rotatably installed on the fixed part, and a transmission part arranged in the fixed part, the power output end of the operating part freely penetrates into the fixed part and is connected to the transmission part, a one-way locking part is provided between the operating part and the fixed part, the two clamping parts are slidably connected to the fixed part, and a part of each clamping part freely penetrates into the fixed part and is connected to the power output end of the transmission part; the operating part drives the two clamping parts to move toward or away from each other through the transmission part, and the one-way locking part is used to limit the operating part to be able to rotate freely only in the direction of driving the two clamping parts to move toward each other; and a plurality of legs 12 are fixedly installed along the circumference of the bottom of the base plate 1 to facilitate more stable support of the base plate 1.

[0030] like Figure 1-6 As shown, according to another embodiment of the present invention, preferably, the paint film hardness testing device is further optimized for the transmission part, fixed part, clamping part and operating part it includes, the transmission part includes a gear 44 vertically rotatably installed in the fixed part and two racks 47 meshing with the gear 44, the power output end of the operating part is freely inserted into the fixed part and connected with the gear 44, the two racks 47 are located on the upper and lower sides of the gear 44, and one part of the two clamping parts is freely inserted into the fixed part and connected with the two racks 47; and preferably, the cavity 41 is provided with limited openings on the two opposite inner walls along the vertical direction in a direction parallel to the strip hole 42. The limiting groove 43 has a slot width that is smaller than the slot bottom width. A connecting block 48 is fixedly installed on the side wall of each rack 47 facing the limiting groove 43. A limiting block 49 is provided between the connecting block 48 and the limiting groove 43. The limiting block 49 is a T-shaped structure. The horizontal section of the limiting block 49 is slidably engaged with the limiting groove 43, and the vertical section of the limiting block 49 is freely passed through the limiting groove 43 and then fixedly connected with the connecting block 48; so that in the process of the operating part driving the gear 44 to rotate and causing the two racks 47 to move toward or away from each other, the cooperation between the limiting block 49 and the corresponding limiting groove 43 can ensure that the movement trajectory of the two racks 47 does not deviate.

[0031] The fixing part includes a fixing plate 4 vertically fixedly installed at one end of the base plate 1, a cavity 41 is opened in the fixing plate 4, and two strip-shaped holes 42 are horizontally opened on the side wall connecting the fixing plate 4 and the base plate 1. The two strip-shaped holes 42 are arranged in parallel in the vertical direction. The gear 44 and the two racks 47 are located in the cavity 41. The power output end of the operating part can freely penetrate into the cavity 41 and be connected to the gear 44. One part of the two clamping parts can freely pass through the two strip-shaped holes 42 and be connected to the two racks 47 in a one-to-one correspondence.

[0032] Each of the clamping parts includes a splint 5 slidably connected to the base plate 1, the splint 5 is arranged perpendicular to the fixed plate 4, and a connecting plate 51 is fixedly installed on the side wall of the splint 5 close to the fixed plate 4, the connecting plate 51 is slidably connected to the corresponding bar hole 42 and can freely penetrate into the cavity 41 and be fixedly connected to the corresponding rack 47; and preferably, a sliding groove 11 is provided on the upper part of the base plate 1 along the sliding direction of the two splints 5, and a slider 53 is fixedly installed on the lower part of each connecting plate 51, and the two sliders 53 are slidably connected to the sliding groove 11 to ensure the sliding stability of the two splints 5; at the same time, buffer pads 52 are fixedly installed on the opposite side walls of the two splints 5, and the buffer pads 52 are made of elastic material to ensure that the two splints 5 and the test piece do not make rigid contact during the clamping process, thereby reducing damage between the two.

[0033] The operating portion includes a knob 46 rotatably mounted on the side of the fixed plate 4 away from the base plate 1 via a rotating shaft 45. The rotating shaft 45 freely penetrates the cavity 41 and is coaxially fixedly connected to the gear 44. The one-way locking member is arranged between the rotating shaft 45 and the fixed plate 4. The one-way locking member includes a ratchet 6 fixedly sleeved on the rotating shaft 45 and a pawl 61 rotatably mounted on the side wall of the fixed plate 4 via a connecting shaft 62. The ratchet 6 is engaged with the pawl 61. A torsion spring (not shown) is sleeved on the connecting shaft 62. A spring (not shown) is elastically connected between the pawl 61 and the fixed plate 4; in the process of the operating knob 46 driving the rotating shaft 45 to rotate, the cooperation between the ratchet 6 and the pawl 61 can ensure that the knob 46 can only rotate in the direction when the two splints 5 move towards each other, so as to ensure that the two splints 5 are firmly clamped; and the torsion spring can also ensure that the pawl 61 can be reset in time and always engage with the ratchet 6; the use principle, specific structure and cooperation method of the ratchet 6, pawl 61 and torsion spring are all existing technologies and will not be described in detail here.

[0034] like Figure 1 As shown, according to another embodiment of the present invention, the paint film hardness testing device is preferably, preferably, a support plate 2 is vertically fixedly installed on the upper part of one end of the base plate 1 away from the fixed plate 4, and a mounting plate 3 is horizontally fixedly installed on the end of the support plate 2 away from the base plate 1, and the mounting plate 3 is located directly above the base plate 1, and an adjusting part and a detecting part are provided at the lower part of the mounting plate 3, and the detecting part is movably connected to the adjusting part and is slidably connected to the mounting plate 3, and the adjusting part is used to drive the detecting part to slide in a direction perpendicular to the sliding trajectory of the two splints 5.

[0035] The mounting plate 3 is an L-shaped structure, the free end of the vertical section of the mounting plate 3 is fixedly connected to the support plate 2, and the horizontal section of the mounting plate 3 is arranged toward the base plate 1. The adjusting member includes a screw 7 horizontally rotatably installed between the horizontal section of the mounting plate 3 and the support plate 2, and a motor (not shown) fixedly installed in the support plate 2. The screw 7 freely penetrates into the support plate 2 and is coaxially fixedly connected to the power output shaft of the motor (not shown). The detection member is threadedly connected to the screw 7 and is slidingly connected to the vertical section of the mounting plate 3; the motor (not shown) drives the screw 7 to rotate, so that the detection member moves along the axial direction of the screw 7.

[0036] The detection part includes a vertically arranged connecting sleeve 8, a sliding rod 81 that slides between the inner and outer sides of the lower end of the connecting sleeve 8, a mounting block 9 fixedly connected to one end of the sliding rod 81 outside the connecting sleeve 8, and a detection pen 93 vertically fixedly installed on the lower part of the mounting block 9. The upper end of the connecting sleeve 8 is slidably connected to the vertical section of the mounting plate 3, and the screw rod 7 freely passes through the connecting sleeve 8 and is threadedly connected to it. A locking bolt 82 is threadedly installed on the side wall of the connecting sleeve 8, and the locking bolt 82 is used to resist the sliding rod 81. A sleeve rod 91 is vertically fixedly installed on the upper part of the mounting block 9, and the sleeve rod 91 is used to install a weight 92; and preferably, a weight rack 31 is fixedly installed on the side wall of the vertical section of the mounting plate 3 away from its horizontal section for accommodating the weight 92.

[0037] The operating principle of the present invention is as follows: when the present invention is used, the workpiece to be tested is placed on the base plate 1 and between the two clamping plates 5, and then the knob 46 is turned to drive the rotating shaft 45 to rotate, and the two clamps are driven to move toward each other through the transmission of the gear 44 and the two racks 47 until the workpiece to be tested is clamped and fixed. Moreover, due to the cooperation between the ratchet 6 and the pawl 61, the clamping stability of the two clamping plates 5 can be ensured. Then, the locking bolt 82 is loosened, and the length of the sliding rod 81 sliding out of the connecting sleeve 8 is adjusted so that the detection pen 93 is against the workpiece to be tested. After the adjustment is in place, the locking bolt is tightened. The bolt 82 fixes the sliding rod 81, and a corresponding number of weights 92 are installed on the sleeve rod 91, and then the motor (not shown) is started to drive the screw 7 to rotate, so that the connecting sleeve 8 moves along the axial direction of the screw 7, so that the detection pen 93 performs a line detection on the workpiece to be tested; after the detection is completed, the motor is stopped, the locking bolt 82 is loosened, the sliding rod 81 is received in the connecting sleeve 8, and then the locking bolt 82 is tightened, and then the pawl 61 is rotated to disengage it from the ratchet 6, and the knob 46 is rotated in the opposite direction to make the two splints 5 move away from each other, and then the next workpiece to be tested is replaced.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A coating film hardness testing device, characterized in that: include: a bottom plate (1) arranged horizontally; as well as The clamping mechanism comprises a fixed portion fixedly mounted on one end of a base plate (1), two clamping portions slidably mounted on the base plate (1) in opposite directions, an operating portion rotatably mounted on the fixed portion, and a transmission portion arranged in the fixed portion, wherein the power output end of the operating portion freely penetrates into the fixed portion and is connected to the transmission portion, a one-way locking member is provided between the operating portion and the fixed portion, the two clamping portions are slidably connected to the fixed portion, and a portion of each clamping portion freely penetrates into the fixed portion and is connected to the power output end of the transmission portion; The operating part drives the two clamping parts to move toward or away from each other through the transmission part, and the one-way locking member is used to limit the operating part to rotate freely only in the direction of driving the two clamping parts to move toward each other.

2. A paint film hardness testing device according to claim 1, characterized in that: The transmission part includes a gear (44) vertically rotatably mounted in the fixed part and two racks (47) meshed with the gear (44); the power output end of the operating part freely penetrates into the fixed part and is connected to the gear (44); the two racks (47) are located on the upper and lower sides of the gear (44); and one part of the two clamping parts freely penetrates into the fixed part and is connected to the two racks (47) in a one-to-one correspondence.

3. A paint film hardness testing device according to claim 2, characterized in that: The fixing portion comprises a fixing plate (4) vertically fixedly mounted on one end of the base plate (1), a cavity (41) being provided in the fixing plate (4), and two strip-shaped holes (42) being horizontally provided on the side wall connecting the fixing plate (4) and the base plate (1), the two strip-shaped holes (42) being arranged in parallel along the vertical direction, the gear (44) and the two racks (47) being located in the cavity (41), the power output end of the operating portion freely passing through the cavity (41) and being connected to the gear (44), and one part of the two clamping portions freely passing through the two strip-shaped holes (42) and being connected to the two racks (47) in a one-to-one correspondence.

4. A paint film hardness testing device according to claim 3, characterized in that: Each of the clamping parts includes a clamping plate (5) slidably connected to the bottom plate (1), the clamping plate (5) is arranged perpendicular to the fixed plate (4), and a connecting plate (51) is fixedly installed on the side wall of the clamping plate (5) close to the fixed plate (4), and the connecting plate (51) is slidably connected to the corresponding strip hole (42) and can freely penetrate into the cavity (41) and be fixedly connected to the corresponding rack (47).

5. A paint film hardness testing device according to claim 2, characterized in that: The operating portion comprises a knob (46) rotatably mounted on a side of the fixed plate (4) away from the bottom plate (1) via a rotating shaft (45); the rotating shaft (45) freely penetrates into the cavity (41) and is coaxially fixedly connected to the gear (44); and the one-way locking member is arranged between the rotating shaft (45) and the fixed plate (4).

6. A paint film hardness testing device according to claim 5, characterized in that: The one-way locking member comprises a ratchet (6) fixedly sleeved on a rotating shaft (45) and a pawl (61) rotatably mounted on a side wall of a fixed plate (4) via a connecting shaft (62); the ratchet (6) and the pawl (61) are engaged with each other; a torsion spring is sleeved on the connecting shaft (62); and the torsion spring is elastically connected between the pawl (61) and the fixed plate (4).

7. A paint film hardness testing device according to claim 3, characterized in that: The cavity (41) is provided with a limiting groove (43) on two opposing inner walls in the vertical direction in a direction parallel to the strip hole (42), the slot width of the limiting groove (43) is smaller than the slot bottom width, and a connecting block (48) is fixedly installed on the side wall of each rack (47) facing the limiting groove (43) arranged opposite thereto, and a limiting block (49) is provided between the connecting block (48) and the limiting groove (43), and the limiting block (49) is a T-shaped structure, the horizontal section of the limiting block (49) is slidably engaged with the limiting groove (43), and the vertical section of the limiting block (49) freely passes through the limiting groove (43) and is fixedly connected to the connecting block (48).

8. A paint film hardness testing device according to claim 3, characterized in that: A support plate (2) is vertically fixedly installed on the upper part of one end of the base plate (1) away from the fixed plate (4), and a mounting plate (3) is horizontally fixedly installed on the upper part of one end of the support plate (2) away from the base plate (1). The mounting plate (3) is located directly above the base plate (1), and an adjusting member and a detecting member are provided at the lower part of the mounting plate (3). The detecting member is movably connected to the adjusting member and is slidably connected to the mounting plate (3). The adjusting member is used to drive the detecting member to slide in a direction perpendicular to the sliding track of the two clamping plates (5).

9. A paint film hardness testing device according to claim 8, characterized in that: The mounting plate (3) is an L-shaped structure, the free end of the vertical section of the mounting plate (3) is fixedly connected to the support plate (2), the horizontal section of the mounting plate (3) is arranged toward the bottom plate (1), the adjusting member comprises a screw rod (7) horizontally rotatably mounted between the horizontal section of the mounting plate (3) and the support plate (2), and a motor fixedly mounted in the support plate (2), the screw rod (7) freely penetrates into the support plate (2) and is coaxially fixedly connected to the power output shaft of the motor, the detecting member is threadedly connected to the screw rod (7) and is slidably connected to the vertical section of the mounting plate (3).

10. A paint film hardness testing device according to claim 9, characterized in that: The detection component comprises a vertically arranged connecting sleeve (8), a sliding rod (81) slidingly inserted between the inner and outer sides of the lower end of the connecting sleeve (8), a mounting block (9) fixedly connected to one end of the sliding rod (81) located outside the connecting sleeve (8), and a detection pen (93) vertically fixedly installed on the lower part of the mounting block (9), the upper end of the connecting sleeve (8) is slidably connected to the vertical section of the mounting plate (3), the screw rod (7) freely passes through the connecting sleeve (8) and is threadedly connected thereto, a locking bolt (82) is threadedly installed on the side wall of the connecting sleeve (8), the locking bolt (82) is used to abut against the sliding rod (81), a sleeve rod (91) is vertically fixedly installed on the upper part of the mounting block (9), and the sleeve rod (91) is used to install a weight (92).

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