Sheet flexibility detection device

Abstract

The invention provides a sheet flexibility detection device, which comprises two support rods arranged on a horizontal plane at an interval, a pressure rod, a pressure mechanism and a camera, and is characterized in that the distance between the two support rods is adjustable; the pressure rod is movably arranged above the two supporting rods; the pressure mechanism is used for driving the pressure rod to move in the vertical direction so as to apply pressure to a to-be-detected sheet placed on the two supporting rods in a crossing mode to enable the to-be-detected sheet to be bent and deformed. The camera is arranged below the two supporting rods in the moving direction of the pressure rod and used for shooting the crack condition of the sheet in the stress deformation process. According to the scheme, the two ends of the to-be-detected sheet can stretch across the two supporting rods to be horizontally placed, and therefore the sheet flexibility detection device can be suitable for flexibility detection of the sheet with poor flexibility; besides, when the pressure rod presses the sheet to bend and deform downwards, the distance between the two supporting rods is gradually reduced so that the two supporting rods can be close to the position, with the maximum deformation quantity, of the sheet, and therefore the sheet flexibility detection device can be suitable for flexibility detection of the sheet with high flexibility.

Description

Technical Field

[0001] The invention relates to the technical field of coating detection, and in particular to a sheet material flexibility detection device. Background Art

[0002] Sheet materials, such as silicone coating flexibility is an important indicator for evaluating coating performance. Coating performance evaluation and coating aging degree evaluation both require reference to the coating flexibility indicator.

[0003] The national standard "GB-T 1973-93 Determination of paint film flexibility" records the existing coating flexibility determination method and test device. The flexibility tester is composed of 7 steel shafts with different diameters fixed on a base. The dimensions of each shaft are as follows:

[0004] Shaft rod 1 is 35mm long and has a diameter of (Error: 0.05mm);

[0005] Shaft rod 2 is 35mm long and has a diameter of (Error: 0.05mm);

[0006] The shaft rod 3 is 35 mm long and has a diameter of (Error: 0.05mm);

[0007] The shaft rod 4 is 35 mm long and has a diameter of (Error: 0.05mm);

[0008] The shaft rod 5 is 35mm*10mm*3mm long, with a curvature radius of 1.5mm (error 0.1mm);

[0009] The shaft rod 6 is 35mm*10mm*2mm long, with a curvature radius of 1mm (error 0.1mm);

[0010] The shaft rod 7 is 35mm*10mm*1mm long, with a curvature radius of 0.5mm (error 0.1mm);

[0011] After the flexibility tester is assembled, the verticality tolerance of each shaft rod and the installation plane is no more than 0.1mm. The basic principle of the flexibility tester to measure the flexibility of the coating is to use external force to cause the coated tinplate to bend. During the bending process, the coating and the base plate are stretched, and the distance the coating is stretched is greater than the distance the base plate is stretched. The impact of the bending on the coating can be expressed by the curvature radius of the base plate at that point.

[0012] This flexibility tester can only make a graded judgment on the flexibility of the sheet (or coating), but has the technical defect of being unable to make further quantitative analysis.

[0013] The patent with the publication number CN108152146B discloses a quantitative detection device for the flexibility of organic coatings, which measures the performance of the flexible sheet to be tested by setting upper and lower clamps, pressing the upper clamp down on the flexible sheet to be tested, and using image recognition software to detect the cracking process on the coating surface. However, before testing, the flexible sheet to be tested needs to be bent and then placed between the upper and lower clamps. For sheets with poor flexibility (such as silicone coatings), the sheet may have begun to crack or even break during the pre-bending process, so it cannot be used to test sheets with poor flexibility.

[0014] The patent with publication number CN103743627B discloses a thermal spray coating toughness rapid testing device and method of use, which realizes a three-point bending test by placing the coating surface of the coating test piece downward on two support rods and then using a pressurized screw to rotate and load. However, since the spacing between the two support rods is a certain value, for sheets with strong flexibility (such as mobile phone films), when the sheet is bent to a large extent, it will pass between the two support rods, so it is impossible to test sheets with strong flexibility. Summary of the invention

[0015] Based on the above problems existing in the prior art, the present invention aims to solve the technical problem that the sheet flexibility detection device in the prior art cannot be applied to the detection of sheets with poor flexibility and sheets with strong flexibility at the same time.

[0016] The present invention provides a sheet material flexibility detection device, which comprises:

[0017] Two support rods are arranged on a horizontal plane at intervals, and the interval between the two support rods is adjustable;

[0018] A pressure rod, movably arranged above the two support rods;

[0019] A pressure mechanism, used for driving the pressure rod to move vertically, so as to apply pressure to the sheet material to be tested placed across the two support rods to cause it to bend and deform;

[0020] A camera is arranged below the two support rods along the moving direction of the pressure rod, and is used to photograph the crack conditions of the sheet during the stress deformation process.

[0021] According to an embodiment of the present invention, the pressure mechanism comprises:

[0022] frame;

[0023] A vertical shaft, the top end of which is rotatably disposed on the frame, and a first thread is formed on the outer surface of the vertical shaft;

[0024] A first screw sleeve, which is meshed with the first thread and is slidably connected to the frame so that the first screw sleeve can slide vertically;

[0025] A first connecting frame is fixedly connected to the first screw sleeve, and the pressure rod is fixedly arranged at the bottom of the first connecting frame;

[0026] The rotating driving member is fixedly arranged on the frame, and the output end of the rotating driving member is fixedly connected to the top end of the vertical shaft.

[0027] According to an embodiment of the present invention, the pressure mechanism further comprises a first sliding block fixedly connected to the first screw sleeve, a vertical sliding groove is provided at a position on the frame corresponding to the first screw sleeve, and the first sliding block is slidably matched with the vertical sliding groove.

[0028] According to an embodiment of the present invention, the sheet flexibility detection device further includes two transverse movement mechanisms and a transverse movement drive assembly, the two transverse movement mechanisms are respectively arranged in one-to-one correspondence with the two support rods, and the transverse movement drive assembly is used to provide power to the two transverse movement mechanisms; the transverse movement mechanism includes:

[0029] A transverse shaft, one end of which is rotatably disposed on the frame, and the other end of which is connected to the transverse driving assembly, and a second thread is provided on the outer surface of the transverse shaft;

[0030] A second screw sleeve, which is meshed with the second thread and is slidably connected to the frame so that the second screw sleeve can slide in a horizontal direction;

[0031] A connecting rod, a top end of which is fixedly connected to the second screw sleeve;

[0032] The second connecting frame is fixedly connected to the bottom end of the connecting rod, and the supporting rod is fixedly arranged at the bottom of the corresponding second connecting frame.

[0033] According to an embodiment of the present invention, the connecting rod is a telescopic rod.

[0034] According to one embodiment of the present invention, the traverse drive assembly is a bevel gear transmission assembly, which includes:

[0035] A first bevel gear, fixedly mounted on the vertical shaft;

[0036] The second bevel gear is fixedly mounted on an end of the transverse axis away from the frame and meshes with the first bevel gear.

[0037] According to an embodiment of the present invention, both the second connecting frame and the first connecting frame are gantries.

[0038] According to an embodiment of the present invention, the transverse movement mechanism further comprises a second sliding block fixedly connected to the second screw sleeve, a horizontal sliding groove is provided at a position on the frame corresponding to the second screw sleeve, and the second sliding block is slidably matched with the horizontal sliding groove.

[0039] According to one embodiment of the present invention, the sheet flexibility detection device also includes an angle scale, which is detachably fixed to the inner wall of the frame and arranged parallel to the moving direction of the pressure rod, and the zero point position of the angle scale corresponds to the height position of the sheet in the initial state.

[0040] According to an embodiment of the present invention, the sheet material flexibility detection device further comprises a plurality of support legs fixedly disposed at the bottom of the frame to provide support for the frame.

[0041] The beneficial effects of the present invention are:

[0042] In a sheet material flexibility detection device provided by the present invention, both ends of a sheet material to be detected can be placed horizontally across two support rods, thereby being suitable for flexibility detection of sheets with poor flexibility; in addition, when the pressure rod compresses the sheet material to bend downward, the distance between the two support rods gradually decreases to move closer to the position where the deformation of the sheet material is the largest, thereby continuing to provide reliable support for the deformed sheet material and preventing the sheet material from falling from between the two support rods due to large deformation, thereby being suitable for flexibility detection of sheets with strong flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0044] Figure 1 It is a structural schematic diagram of a sheet material flexibility detection device provided by an embodiment of the present invention;

[0045] Figure 2 It is a schematic diagram of the working state of a sheet material flexibility detection device provided by an embodiment of the present invention;

[0046] Figure markings: 100-sheet; 1-support rod; 2-pressure rod; 3-pressure mechanism; 31-frame; 32-vertical axis; 33-first screw sleeve; 34-first connecting frame; 35-rotational drive member; 36-first slider; 311-vertical slide; 4-camera; 5-transverse mechanism; 51-transverse axis; 52-second screw sleeve; 53-connecting rod; 54-second connecting frame; 55-second slider; 6-transverse drive assembly; 61-first bevel gear; 62-second bevel gear; 312-horizontal slide; 7-angle scale; 8-support leg. DETAILED DESCRIPTION

[0047] The following descriptions of the embodiments refer to the attached drawings to illustrate specific embodiments in which the present invention can be implemented.

[0048] The present invention provides a sheet material flexibility detection device, the structure of which is as follows: Figure 1 As shown, it includes two support rods 1 spaced apart on a horizontal plane, a pressure rod 2, a pressure mechanism 3 and a camera 4, wherein the spacing between the two support rods 1 is adjustable; the pressure rod 2 is movably arranged above the two support rods 1; the pressure mechanism 3 is used to drive the pressure rod 2 to move vertically, so as to apply pressure to the sheet 100 to be inspected placed across the two support rods 1 to cause it to bend and deform; the camera 4 is arranged below the two support rods 1 along the moving direction of the pressure rod 2, so as to shoot the crack conditions of the sheet 100 during the stress deformation process.

[0049] like Figure 2 The figure is a schematic diagram of the state of the sheet material flexibility detection device when it is working. The sheet material 100 to be detected can be placed on the two support rods 1 in the initial state (i.e., the straight state), so that the present scheme can be applied to the flexibility detection of the sheet material 100 with poor flexibility; and by setting the distance between the two support rods 1 to be adjustable, when the pressure mechanism 3 drives the pressure rod 2 to move downward to apply pressure to the sheet material 100 to be detected placed across the two support rods 1, the distance between the two support rods 1 can be reduced so that the two support rods 1 are brought closer to the position where the deformation of the sheet material 100 is the largest, thereby continuing to provide reliable support for the deformed sheet material 100, avoiding the sheet material 100 from falling from between the two support rods 1 due to large deformation, so that the present scheme can be applied to the flexibility detection of the sheet material 100 with strong flexibility.

[0050] Please continue to refer to Figure 1 Specifically, the pressure mechanism 3 includes a frame 31, a vertical shaft 32, a first screw sleeve 33, a first connecting frame 34 and a rotating driving member 35, wherein the top end of the vertical shaft 32 is rotatably arranged on the frame 31, and a first thread is provided on the outer surface of the vertical shaft 32; the first screw sleeve 33 is meshed with the first thread and is slidably connected with the frame 31 so that the first screw sleeve 33 can slide vertically; the first connecting frame 34 is fixedly connected with the first screw sleeve 33, and the pressure rod 2 is fixedly arranged at the bottom of the first connecting frame 34; the rotating driving member 35 is fixedly arranged on the frame 31, and the output end of the rotating driving member 35 is fixedly connected with the top end of the vertical shaft 32. Specifically, the rotating driving member 35 can be a motor.

[0051] It can be understood that since the first screw sleeve 33 is engaged with the first thread on the outer surface of the vertical shaft 32, when the rotating drive member 35 drives the vertical shaft 32 to rotate, the first screw sleeve 33 can drive the first connecting frame 34 and the pressure rod 2 to move downward, thereby pressing the sheet 100 to be tested to cause it to bend and deform.

[0052] As a specific embodiment, in order to realize the sliding connection between the first screw sleeve 33 and the frame 31, the pressure mechanism 3 also includes a first slider 36 fixedly connected to the first screw sleeve 33, and a vertical slide groove 311 is opened at a position on the frame 31 corresponding to the first screw sleeve 33, and the first slider 36 slides in cooperation with the vertical slide groove 311.

[0053] Furthermore, in order to achieve adjustable spacing between the two support rods 1, the sheet flexibility detection device also includes two transverse mechanisms 5 and transverse drive assemblies 6, the two transverse mechanisms 5 are respectively arranged in one-to-one correspondence with the two support rods 1, and the transverse drive assembly 6 is used to provide power to the two transverse mechanisms 5; the transverse mechanism 5 includes a transverse shaft 51, a second screw sleeve 52, a connecting rod 53 and a second connecting frame 54, wherein one end of the transverse shaft 51 is rotatably set on the frame 31, and the other end is connected to the transverse drive assembly 6, and the outer surface of the transverse shaft 51 is provided with a second thread; the second screw sleeve 52 is meshed with the second thread and is slidably connected to the frame 31 so that the second screw sleeve 52 can slide in the horizontal direction; the top end of the connecting rod 53 is fixedly connected to the second screw sleeve 52; the second connecting frame 54 is fixedly connected to the bottom end of the connecting rod 53, and the support rod 1 is fixedly set at the bottom of the corresponding second connecting frame 54, specifically, the second connecting frame 54 and the first connecting frame 34 are both gantries.

[0054] It can be understood that since the second screw sleeve 52 is engaged with the second thread on the outer surface of the transverse shaft 51, when the transverse drive assembly 6 drives the transverse shaft 51 to rotate, the second screw sleeve 52 can drive the connecting rod 53, the second connecting frame 54 and the support rod 1 to move in the horizontal direction to adjust the distance between the two support rods 1, thereby providing reliable support for the deformed sheet 100.

[0055] Preferably, the transverse driving assembly 6 is a bevel gear transmission assembly, which includes a first bevel gear 61 and a second bevel gear 62, wherein the first bevel gear 61 is fixedly mounted on the vertical shaft 32; the second bevel gear 62 is fixedly mounted on an end of the transverse shaft 51 away from the frame 31, and meshes with the first bevel gear 61.

[0056] It is not difficult to understand that by setting the transverse driving assembly 6 as a bevel gear transmission assembly, the transverse mechanism 5 and the pressure mechanism 3 can share the same power driving component (i.e., the rotating driving component 35). On the one hand, the overall compactness of the detection device can be improved, and on the other hand, the distance between the two support rods 1 can be synchronously adjusted while the pressure rod 2 presses the sheet 100.

[0057] It should also be noted that, in order to enable the transverse movement mechanism 5 and the pressure mechanism 3 to share the same power drive component, setting the transverse movement drive assembly 6 as a bevel gear transmission assembly is only a preferred embodiment of the present invention. In other embodiments, the transverse movement drive assembly 6 can also be set to other transmission assemblies, such as a worm gear assembly.

[0058] More preferably, the connecting rod 53 is a telescopic rod. When the sheet material 100 to be detected has strong flexibility, the height of the supporting rod 1 can be increased to allow the sheet material 100 to have a larger deformation space.

[0059] As a specific embodiment, in order to realize the sliding connection between the second screw sleeve 52 and the frame 31, the transverse movement mechanism 5 also includes a second slider 55 fixedly connected to the second screw sleeve 52, and a horizontal slide groove 312 is opened at a position on the frame 31 corresponding to the second screw sleeve 52, and the second slider 55 is slidably matched with the horizontal slide groove 312.

[0060] In this embodiment, the sheet flexibility detection device further includes an angle scale 7, which is detachably fixed to the inner wall of the frame 31 and is arranged parallel to the moving direction of the pressure rod 2. This solution detects the flexibility of the sheet 100 based on the principle of a three-point bending test, and can evaluate the bending angle of the sheet 100 in real time through the angle scale 7. The use principle of the angle scale 7 in the three-point bending test has been disclosed in patent CN103743627B, so it is not repeated in this solution.

[0061] In another embodiment of the present solution, the angle scale 7 may be replaced by a visual camera, which can capture the contour of the sheet when it is bent and fit a curve corresponding to the contour on a computer to obtain the curvature of the sheet 100.

[0062] Furthermore, the sheet material flexibility detection device also includes a plurality of support legs 8 fixedly disposed at the bottom of the frame 31 to provide support for the frame 31 .

[0063] In order to facilitate the understanding of this solution, the working principle of the present invention is described in detail by taking the sheet 100 as an organic silicon coating as an example:

[0064] First, the two ends of the organosilicon-coated sheet are placed horizontally across the two support rods 1, and the rotating driving member 35 is started to drive the vertical shaft 32 to rotate. Since the first screw sleeve 33 is engaged with the first thread on the outer surface of the vertical shaft 32, when the rotating driving member 35 drives the vertical shaft 32 to rotate, the first screw sleeve 33 can drive the first connecting frame 34 and the pressure rod 2 to move downward, thereby compressing the organosilicon-coated sheet to be tested to cause it to bend and deform.

[0065] At the same time, since the second screw sleeve 52 is engaged with the second thread on the outer surface of the transverse shaft 51, when the transverse drive assembly 6 drives the transverse shaft 51 to rotate, the second screw sleeve 52 can drive the connecting rod 53, the second connecting frame 54 and the support rod 1 to move in the horizontal direction to adjust the distance between the two support rods 1, thereby providing reliable support for the deformed silicone coated sheet.

[0066] When the camera 4 captures cracks on the organosilicon coating sheet, the bending angle of the organosilicon coating sheet at this time can be read by the angle scale 7 .

[0067] Compared with the prior art, in a sheet flexibility detection device provided by the present invention, both ends of the sheet 100 to be detected can be placed horizontally across the two support rods 1, so that it can be suitable for flexibility detection of sheets 100 with poor flexibility; in addition, when the pressure rod 2 presses the sheet 100 to bend downward, the distance between the two support rods 1 gradually decreases to move closer to the position where the deformation of the sheet 100 is the largest, so as to continue to provide reliable support for the deformed sheet 100, and prevent the sheet 100 from falling from between the two support rods 1 due to large deformation, so that it can be suitable for flexibility detection of sheets 100 with strong flexibility.

[0068] It should be noted that although the present invention is disclosed as above by specific embodiments, the above embodiments are not intended to limit the present invention. Ordinary technicians in this field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. A sheet material flexibility detection device, characterized in that: include: Two support rods (1) are arranged at intervals on a horizontal plane, and the distance between the two support rods (1) is adjustable; A pressure rod (2) movably arranged above the two support rods (1); A pressure mechanism (3) is used to drive the pressure rod (2) to move vertically, so as to apply pressure to the sheet material (100) to be tested and placed across the two support rods (1) to cause it to bend and deform; A camera (4) is arranged below the two support rods (1) along the moving direction of the pressure rod (2) and is used to photograph crack conditions of the sheet (100) during the process of deformation under stress.

2. A sheet material flexibility detection device according to claim 1, characterized in that: The pressure mechanism (3) comprises: Rack (31); A vertical shaft (32), the top end of which is rotatably disposed on the frame (31), and a first thread is formed on the outer surface of the vertical shaft (32); A first screw sleeve (33) meshed with the first thread and slidably connected to the frame (31) so that the first screw sleeve (33) can slide vertically; A first connecting frame (34) is fixedly connected to the first screw sleeve (33), and the pressure rod (2) is fixedly arranged at the bottom of the first connecting frame (34); The rotating driving member (35) is fixedly arranged on the frame (31), and the output end of the rotating driving member (35) is fixedly connected to the top end of the vertical shaft (32).

3. A sheet material flexibility detection device according to claim 2, characterized in that: The pressure mechanism (3) further comprises a first sliding block (36) fixedly connected to the first screw sleeve (33); a vertical sliding groove (311) is provided at a position on the frame (31) corresponding to the first screw sleeve (33); and the first sliding block (36) is slidably matched with the vertical sliding groove (311).

4. A sheet material flexibility detection device according to claim 2, characterized in that: It also comprises two transverse movement mechanisms (5) and a transverse movement driving assembly (6), wherein the two transverse movement mechanisms (5) are respectively arranged in one-to-one correspondence with the two support rods (1), and the transverse movement driving assembly (6) is used to provide power to the two transverse movement mechanisms (5); the transverse movement mechanism (5) comprises: A transverse shaft (51), one end of which is rotatably disposed on the frame (31), and the other end of which is connected to the transverse drive assembly (6), and a second thread is formed on the outer surface of the transverse shaft (51); A second screw sleeve (52) meshed with the second thread and slidably connected to the frame (31) so that the second screw sleeve (52) can slide in a horizontal direction; A connecting rod (53), the top end of which is fixedly connected to the second screw sleeve (52); The second connecting frame (54) is fixedly connected to the bottom end of the connecting rod (53), and the supporting rod (1) is fixedly arranged at the bottom of the corresponding second connecting frame (54).

5. A sheet material flexibility detection device according to claim 4, characterized in that: The connecting rod (53) is a telescopic rod.

6. A sheet material flexibility detection device according to claim 4, characterized in that: The traverse drive assembly (6) is a bevel gear transmission assembly, which comprises: A first bevel gear (61) is fixedly mounted on the vertical shaft (32); The second bevel gear (62) is fixedly mounted on an end of the transverse shaft (51) away from the frame (31) and meshes with the first bevel gear (61).

7. A sheet material flexibility detection device according to claim 4, characterized in that: The second connecting frame (54) and the first connecting frame (34) are both gantry frames.

8. A sheet material flexibility detection device according to claim 4, characterized in that: The transverse movement mechanism (5) further comprises a second sliding block (55) fixedly connected to the second screw sleeve (52); a horizontal sliding groove (312) is provided at a position on the frame (31) corresponding to the second screw sleeve (52); and the second sliding block (55) is slidably matched with the horizontal sliding groove (312).

9. A sheet material flexibility detection device according to claim 2, characterized in that: It also comprises an angle scale (7), which is detachably fixed to the inner wall of the frame (31) and is arranged parallel to the moving direction of the pressure rod (2).

10. The sheet material flexibility detection device according to claim 1, characterized in that: It also includes a plurality of support legs (8) fixedly arranged at the bottom of the frame (31) for providing support for the frame (31).

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