A trailer coating pencil hardness detection device

Abstract

The application provides a trailer coating pencil hardness detection device, which comprises a pencil tool, a moving mechanism and a load mechanism, wherein the pencil tool is arranged opposite to a plate sample to be detected, the pencil tool has a plurality of clamping positions for clamping pencils with different hardness respectively; the moving mechanism is used to drive the pencil tool and the plate sample to move relatively, so that a plurality of pencils plough through the surface of the plate sample in different paths in the order of hardness from small to large respectively; and the load mechanism is used to apply a certain load to the pencil or the pencil tool. Compared with the prior art, the robot needs to move back and forth multiple times to grasp pencils with different hardness respectively, and the pencils with different hardness need to plough through the sample coating in different paths, the present scheme saves the time of the robot moving back and forth, and does not need to set complex moving paths of multiple pencils in the program, so that the requirement for the device is lower, and the production cost is also significantly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of trailer detection devices, in particular to a device for detecting the pencil hardness of a trailer coating. Background Art

[0002] A trailer is a vehicle towed by a motor vehicle without its own propulsion system. It consists of a motor vehicle (truck, tractor, or forklift) and one or more trailers. The truck and tractor are the driving vehicles in a train, known as the lead vehicle. The driven vehicle towed by the lead vehicle is called a trailer. They are an important vehicle type for road transport, and using a train is the most effective and simple means of improving economic efficiency.

[0003] During trailer production, the trailer surface needs to be painted to prevent rust and enhance its aesthetics. The choice of paint coating material also has relevant requirements. Coating hardness is a crucial parameter that trailer manufacturers cannot ignore, and hardness testing of various coatings is often required.

[0004] Patent publication number CN109556979B discloses a pencil hardness tester and method for color-coated substrates. This method uses a robot to pick up pencils, sharpen them, and calibrate them before testing the sample coating for pencil hardness. In this approach, the robot must make multiple round trips to pick up pencils of varying hardness, wasting considerable time. Furthermore, to ensure accurate test results, pencils of varying hardness must plow through the sample coating using different paths. Therefore, the robot must construct different movement paths during each test, placing high demands on software programming. Summary of the Invention

[0005] Based on the above-mentioned problems existing in the prior art, the present invention aims to solve the technical problems in the prior art color-coated plate pencil hardness tester and testing method, such as the robot's multiple round trips to grasp pencils of different hardnesses wastes a lot of time, and the need to build different movement routes in the robot, which places high requirements on software programming.

[0006] The present invention provides a device for detecting pencil hardness of trailer coating, which comprises:

[0007] A pencil fixture is arranged opposite to the plate sample to be tested, and the pencil fixture has multiple clamping positions for clamping pencils of different hardness;

[0008] a moving mechanism for driving the pencil fixture and the plate sample to move relative to each other, so that the plurality of pencils plow the surface of the plate sample in order of increasing hardness; the plurality of clamping positions are staggered relative to each other in the direction of relative movement of the pencil fixture and the plate sample, so that the plurality of pencils plow the surface of the plate sample in different paths;

[0009] The load mechanism is used to apply a certain load to the pencil or the pencil tool.

[0010] According to one embodiment of the present invention, the pencil tool comprises:

[0011] A turntable is disposed opposite to the plate sample to be tested, and the turntable is provided with a plurality of mounting holes distributed along the circumference to serve as the clamping positions; the plurality of mounting holes are at different distances from the center of the turntable;

[0012] A plurality of knob screws corresponding to the mounting holes are respectively connected to the circumferential side walls of the turntable through threads, so as to clamp and fix the pencils in the corresponding mounting holes.

[0013] According to one embodiment of the present invention, the moving mechanism includes:

[0014] a first mounting seat;

[0015] The rotary driving member is fixedly arranged on the first mounting seat; the output shaft of the rotary driving member is fixedly connected to the center of the turntable.

[0016] According to one embodiment of the present invention, the loading mechanism includes:

[0017] a second mounting seat, arranged side by side with the first mounting seat;

[0018] a telescopic driving member, fixedly mounted on the second mounting seat;

[0019] a pressure sensing element, fixedly disposed on a side wall of the first mounting seat on a side close to the second mounting seat;

[0020] The elastic member has two ends fixedly connected to the output end of the telescopic driving member and the pressure sensing element respectively, and the first mounting seat is movably arranged in a direction close to or away from the plate sample.

[0021] According to one embodiment of the present invention, the trailer coating pencil hardness testing device further includes a frame, the first mounting seat is slidably disposed on the frame so that the first mounting seat can move closer to or away from the plate sample to be tested; and the second mounting seat is fixedly disposed on the frame.

[0022] According to one embodiment of the present invention, the trailer coating pencil hardness testing device further includes a sample fixture for clamping the plate sample to be tested. The sample fixture and the pencil fixture are arranged side by side, and the surface of the sample fixture facing the pencil fixture has a clamping position for placing the plate sample to be tested.

[0023] According to one embodiment of the present invention, the trailer coating pencil hardness testing device further includes a conductive detection mechanism for detecting the traces left by the pencil on the surface of the plate sample, which includes:

[0024] a brush configured to be capable of, and only capable of, sliding contact with a lead of the pencil being plowed across the surface of the sheet material specimen, thereby forming an electrical connection with the lead of the pencil;

[0025] a conductive contact piece fixedly disposed at the clamping position, wherein the conductive contact piece is configured to be able to contact a portion of the plate sample that is not coated, thereby forming an electrical connection with the plate sample;

[0026] The conductive detection circuit has two ends electrically connected to the brush and the conductive contact piece respectively; the conductive detection circuit includes a power supply and an alarm.

[0027] According to an embodiment of the present invention, a receiving groove is provided on a surface of the sample fixture facing the pencil fixture to serve as the clamping position, and the shape of the receiving groove matches the shape of the plate sample.

[0028] According to an embodiment of the present invention, the conductive contact piece is fixedly disposed on a side wall of the accommodating groove, so that the conductive contact piece is configured to be able to contact the end surface of the plate sample.

[0029] According to one embodiment of the present invention, the conductive detection mechanism further includes an elastic support rod, and the brush is fixedly arranged on the elastic support rod; when the brush is in sliding contact with the pencil lead, the elastic support rod can be elastically bent and deformed based on its own elasticity.

[0030] The beneficial effects of the present invention are:

[0031] The pencil tooling can clamp multiple pencils with different hardness at the same time, and multiple pencils are arranged in a staggered manner in the relative moving direction of the pencil tooling and the plate sample, the moving mechanism can drive multiple pencils to plow through the surface of the plate sample in different paths in order according to the order of hardness from small to large, compared with the robot in the prior art which needs to move back and forth multiple times to respectively grab pencils with different hardness, and requires different hardness pencils to plow through the sample coating in different paths, the scheme saves the time of the robot moving back and forth, and does not need to set multiple complex moving paths of the pencils in the program, the requirement for the device is lower, and the production cost is also significantly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0033] Figure 1 is a structural schematic diagram of a trailer coating pencil hardness detection device provided by an embodiment of the application;

[0034] Figure 2 is a structural schematic diagram of a pencil tooling in an embodiment of the application;

[0035] Figure 3 is a position state schematic diagram of a pencil on the pencil tooling in an embodiment of the application;

[0036] Figure 4 is a principle schematic diagram of a conductive detection circuit in an embodiment of the application;

[0037] The drawings are as follows: 1, pencil tooling; 100, pencil; 11, turntable; 110, mounting hole; 12, knob screw; 2, moving mechanism; 21, first mounting seat; 22, rotary driving part; 3, load mechanism; 31, second mounting seat; 32, telescopic driving part; 33, pressure sensing element; 34, elastic element; 4, rack; 5, sample tooling; 50, accommodating groove; 51, negative pressure generator; 52, negative pressure suction hole; 6, conductive detection mechanism; 61, brush; 62, conductive contact; 63, conductive detection circuit; 64, elastic support rod. DETAILED DESCRIPTION

[0038] The following description of the embodiments is made with reference to the additional drawings, which illustrate specific embodiments in which the application can be practiced.

[0039] The application provides a trailer coating pencil hardness detection device, which has the structure as Figure 1 As shown in the drawings, it comprises a pencil tool 1, a moving mechanism 2 and a load mechanism 3, wherein the pencil tool 1 is arranged opposite to a board sample (not shown in the drawings) to be tested, the pencil tool 1 has multiple clamping positions for clamping pencils 100 of different hardness respectively; the moving mechanism 2 is used to drive the pencil tool 1 and the board sample to move relatively, so that multiple pencils 100 plow through the surface of the board sample in order of hardness from small to large; multiple clamping positions are arranged staggered to each other in the relative moving direction of the pencil tool 1 and the board sample, so that multiple pencils 100 plow through the surface of the board sample in different paths respectively; the load mechanism 3 is used to apply a certain load to the pencil 100 or the pencil tool 1.

[0040] As shown in the drawings, Figure 2 The pencil tool 1 comprises a rotating disc 11 and multiple knob screws 12, wherein the rotating disc 11 is arranged opposite to the board sample to be tested, multiple installation holes 110 are formed on the rotating disc 11 and distributed circumferentially, serving as clamping positions; multiple knob screws 12 are respectively connected to the circumferential side wall of the rotating disc 11 through threads, used to clamp and fix the pencil 100 in the corresponding installation hole 110; by screwing in or out the knob screw 12, the pencil 100 installed in the corresponding installation hole 110 can be clamped or loosened.

[0041] Further, in order to arrange multiple clamping positions staggered to each other on the pencil tool 1, so that multiple pencils 100 plow through the surface of the board sample in different paths respectively, multiple installation holes 110 are different in distance from the center of the rotating disc 11. Specifically, six installation holes 110 are formed on the rotating disc 11 and distributed uniformly in the circumferential direction, the distance of six installation holes 110 from the center of the rotating disc 11 gradually decreases in the clockwise direction, and the distance of six installation holes 110 from the center of the rotating disc 11 is respectively 40mm, 36mm, 32mm, 28mm, 24mm and 20mm; six pencils 100 are respectively installed in six installation holes 110, and six pencils 100 are respectively 100a, 100b, 100c, 100d, 100e and 100f, the hardness of lead of six pencils 100 gradually increases.

[0042] Further, since the standard specification requires that the pencil 100 plows through the surface of the sample to be tested at an angle of 45°, the installation hole 110 is an inclined hole, and the angle is set to 45°, and the state diagram of the pencil 100 installed in the corresponding installation hole 110 is shown in Figure 3 .

[0043] Please continue to refer to Figure 1The moving mechanism 2 comprises a first mounting base 21 and a rotary driving member 22, the rotary driving member 22 is fixedly arranged on the first mounting base 21; the output shaft of the rotary driving member 22 is fixedly connected with the center of the rotating disc 11, specifically, the rotary driving member 22 can be a motor assembled with a speed reducer.

[0044] It is easy to understand that, by fixing the output shaft of the rotary driving member 22 with the center of the rotating disc 11 to drive the pencil tool 1 to rotate, the moving path of the pencil 100 can be circular, thereby reducing the volume of the whole device.

[0045] The loading mechanism 3 comprises a second mounting base 31, a telescopic driving member 32, a pressure sensing element 33 and an elastic member 34, wherein the second mounting base 31 is arranged side by side with the first mounting base 21; the telescopic driving member 32 is fixedly arranged on the second mounting base 31; the pressure sensing element 33 is fixedly arranged on the side wall of the first mounting base 21 close to the second mounting base 31; the two ends of the elastic member 34 are fixedly connected with the output end of the telescopic driving member 32 and the pressure sensing element 33 respectively, and the first mounting base 21 is movably arranged relative to the direction close to or away from the board sample, specifically, the elastic member 34 is a spring, and the rotary driving member 22 is arranged inside the spring annular area.

[0046] It can be understood that, in this embodiment, the elastic member 34 is arranged between the telescopic driving member 32 and the pressure sensing element 33, which can absorb part of the acting force, thereby avoiding the difficulty in controlling the load size when the output end of the telescopic driving member 32 is directly connected with the pressure sensing element 33. Preferably, in order to more conveniently control the load size applied by the telescopic driving member 32, the pressure sensing element 33 should have a display screen. Specifically, in the pencil method for determining the film hardness, the national standard stipulates that the load applied by the pencil port on the film surface is (7.35±0.15) N, therefore, the pressure sensed by the pressure sensing element 33 should be controlled within (7.35±0.15) N.

[0047] Moreover, in this embodiment, the axis of the telescopic driving member 32 is arranged in the horizontal direction, which can avoid the influence of the gravity of each component (such as the pencil 100, the pencil tool 1, etc.) on the applied load size, and the pressure value sensed by the pressure sensing element 33 can be directly used as the load received by the pencil 100 without additional conversion.

[0048] According to an embodiment of the present application, the trailer coating pencil hardness detection device further comprises a rack 4, and the first mounting seat 21 is slidingly arranged on the rack 4, so that the first mounting seat 21 can move towards or away from the plate sample to be detected; and the second mounting seat 31 is fixedly arranged on the rack 4.

[0049] According to an embodiment of the present application, the trailer coating pencil hardness detection device further comprises a sample tool 5 for clamping the plate sample to be detected, and the sample tool 5 is arranged side by side with the pencil tool 1, and the surface of the sample tool 5 towards the pencil tool 1 has a clamping position for placing the plate sample to be detected.

[0050] Specifically, the surface of the sample tool 5 towards the pencil tool 1 is provided with a receiving groove 50 as the clamping position, the shape of the receiving groove 50 matches the shape of the plate sample, and the depth of the receiving groove 50 should be consistent with the thickness of the plate sample to be detected.

[0051] Further, in order to be applicable to the detection of plate samples of various thicknesses, an adjusting plate (not shown in the figure) that can move away from or close to the pencil tool 1 is arranged in the receiving groove 50, so as to adjust the depth of the receiving groove 50 according to the thickness of the plate sample to be detected.

[0052] Further, the sample tool 5 comprises a negative pressure generator 51 fixedly arranged on the rack 4, the inner wall of the receiving groove 50 is provided with a negative pressure suction hole 52, and the negative pressure suction hole 52 is in communication with the negative pressure generator 51 through a pipeline. The negative pressure suction hole 52 can adsorb and fix the plate sample to be detected in the receiving groove 50 through the principle of negative pressure adsorption.

[0053] Please continue to refer to Figure 1 According to an embodiment of the present application, the trailer coating pencil hardness detection device further comprises a conductive detection mechanism 6 for detecting the trace plowed by the pencil 100 on the surface of the plate sample, which comprises an electric brush 61, a conductive contact piece 62 and a conductive detection circuit 63. The electric brush 61 is configured to be able to and only be able to make sliding contact with the lead of one pencil 100 being plowed on the surface of the plate sample, so as to form an electrical connection with the lead of the pencil 100. The conductive contact piece 62 is fixedly arranged on the clamping position, and is configured to be able to contact the part of the plate sample without coating, so as to form an electrical connection with the plate sample. The structure diagram of the conductive detection circuit 63 is as shown in Figure 4As shown, the two ends of the conductive detection circuit 63 are electrically connected to the brush 61 and the conductive contact 62 respectively; the conductive detection circuit 63 includes a power supply and an alarm. Specifically, the alarm can be an alarm bell or an alarm light. The alarm bell can emit an alarm tone, and the alarm light can light up to give an alarm prompt.

[0054] It is easy to understand that when the lead of the pencil 100 plows through the surface of the plate sample, the brush 61 slides into contact with the lead of the pencil 100 and becomes conductive. Moreover, when the lead of the pencil 100 plows through the coating on the surface of the plate sample to expose the plate body (the plate body is a metal plate, generally an iron plate), the lead of the pencil 100 becomes conductive with the plate body, thereby connecting the conductive detection circuit 63 and causing the alarm in the conductive detection circuit 63 to issue an alarm.

[0055] Please continue to refer to Figure 1 Furthermore, in order to enable the brush 61 to effectively contact the lead of the pencil 100 plowing through the surface of the plate sample, the conductive detection mechanism 6 also includes an elastic support rod 64, and the brush 61 is fixedly arranged on the elastic support rod 64; when the brush 61 slides in contact with the lead of the pencil 100, the elastic support rod 64 can be elastically bent and deformed based on its own elasticity.

[0056] Furthermore, since the end surface of the plate sample is generally uncoated, the conductive contact 62 is fixedly mounted on the side wall of the receiving groove 50 so that the conductive contact 62 is configured to contact the end surface of the plate sample. Preferably, the conductive contact 62 is fixedly mounted on the side wall at the bottom of the receiving groove 50 so that the end surface of the plate sample contacts the conductive contact 62 under the action of gravity.

[0057] In order to facilitate the understanding of the present invention, the following Figures 1-4 The working principle of this solution is described in detail:

[0058] In step 1, the plate sample to be tested is placed into the receiving groove 50 , with the thickness of the plate sample being consistent with the depth of the receiving groove 50 , so that the surface of the plate sample is flush with the surface of the sample fixture 5 .

[0059] In step 2, six pencils 100 of the same size but different lead hardness are sequentially installed in the corresponding mounting holes 110 on the turntable 11 in order of lead hardness from small to large, and the leads of the six pencils 100 are in the same plane.

[0060] Step 3: Start the telescopic drive member 32. The piston rod of the telescopic drive member 32 extends to push the pencil fixture 1 and the moving mechanism 2 toward the sample fixture 5, and make the lead of the pencil 100 contact the surface of the sample fixture 5 until the pressure sensed by the pressure sensing element 33 reaches (7.35±0.15)N.

[0061] Step 4: Activate the rotary drive 22 to slowly rotate the turntable 11, causing the six pencils 100 to slowly plow across the surface of the sheet material sample in order of increasing lead hardness. While one pencil 100 is plowing across the surface of the sheet material sample, the lead of the next pencil 100 (the harder pencil) slides into contact with the surface of the sample fixture 5. To prevent wear caused by the sliding contact between the leads of the pencils 100 and the surface of the sample fixture 5, the sliding contact time should be minimized, or the surface of the sample fixture 5 should be sufficiently smooth.

[0062] In step 5, while step 4 is in progress, the conductivity detection mechanism 6 performs real-time conductivity detection. When the alarm in the conductivity detection circuit 63 sounds an alarm, the rotary drive 22 immediately stops. The hardness of the pencil 100 that plowed through the surface of the plate sample at that moment and the hardness of the pencil 100 that plowed through the surface of the plate sample are recorded. This allows the determination that the hardness of the coating on the surface of the plate sample is between the hardnesses of the two pencil leads.

[0063] In step 6, the plate sample and the pencil 100 are removed, and the lead of the used pencil 100 is re-corrected (ie, the pencil is re-sharpened), while the unused pencil 100 does not need to be corrected.

[0064] In summary, in the device for testing the pencil hardness of trailer coatings provided by the present invention, the pencil fixture 1 can simultaneously clamp multiple pencils 100 of different hardnesses, and the multiple pencils are staggered relative to each other in the relative movement direction of the pencil fixture 1 and the plate sample. The moving mechanism 2 can simultaneously drive the multiple pencils 100 to plow across the surface of the plate sample in order of increasing hardness using different paths. Compared to the prior art, in which a robot needs to make multiple round trips to grasp pencils of different hardnesses and requires pencils of different hardnesses to plow across the sample coating using different paths, this solution saves the robot's back-and-forth movement time, eliminates the need to program complex movement paths for multiple pencils, places lower demands on the device, and significantly reduces production costs.

[0065] It should be noted that although the present invention is disclosed above with 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 by the claims.

Claims

1. A trailer coating pencil hardness testing device, characterized in that: include: A pencil fixture (1) is arranged opposite to a plate sample to be tested, wherein the pencil fixture (1) has a plurality of clamping positions, each for clamping pencils (100) of different hardness; A moving mechanism (2) is used to drive the pencil fixture (1) and the plate sample to move relative to each other, so that the plurality of pencils (100) plow through the surface of the plate sample in order of hardness from small to large; the plurality of clamping positions are staggered with each other in the relative movement direction of the pencil fixture (1) and the plate sample, so that the plurality of pencils (100) plow through the surface of the plate sample in different paths respectively; A load mechanism (3) for applying a certain load to the pencil (100) or the pencil tool (1); The pencil tool (1) comprises: A turntable (11) is arranged opposite to the plate sample to be tested, and the turntable (11) is provided with a plurality of mounting holes (110) distributed along the circumference to serve as the clamping positions; the plurality of mounting holes (110) are at different distances from the center of the turntable (11).

2. The trailer coating pencil hardness testing device according to claim 1, characterized in that: A plurality of knob screws (12) corresponding one to the mounting holes (110) are respectively connected to the circumferential side walls of the rotating disk (11) through threads, so as to clamp and fix the pencil (100) in the corresponding mounting hole (110).

3. The trailer coating pencil hardness testing device according to claim 2, characterized in that: The moving mechanism (2) comprises: a first mounting seat (21); A rotary drive member (22) is fixedly arranged on the first mounting seat (21); an output shaft of the rotary drive member (22) is fixedly connected to the center of the turntable (11).

4. The trailer coating pencil hardness testing device according to claim 3, characterized in that: The loading mechanism (3) comprises: a second mounting seat (31), which is arranged side by side with the first mounting seat (21); A telescopic driving member (32) fixedly mounted on the second mounting seat (31); A pressure sensing element (33) is fixedly mounted on a side wall of the first mounting seat (21) close to the second mounting seat (31); The elastic member (34) has two ends fixedly connected to the output end of the telescopic driving member (32) and the pressure sensing element (33), respectively. The first mounting seat (21) is movably arranged in a direction close to or away from the plate sample.

5. The trailer coating pencil hardness testing device according to claim 4, characterized in that: It also includes a frame (4), the first mounting seat (21) being slidably arranged on the frame (4) so ​​that the first mounting seat (21) can move closer to or away from the plate sample to be tested; and the second mounting seat (31) being fixedly arranged on the frame (4).

6. The trailer coating pencil hardness testing device according to claim 1, characterized in that: It also includes a sample jig (5) for clamping the plate sample to be tested, the sample jig (5) and the pencil jig (1) are arranged side by side, and the surface of the sample jig (5) facing the pencil jig (1) has a clamping position for placing the plate sample to be tested.

7. The trailer coating pencil hardness testing device according to claim 6, characterized in that: It also includes a conductive detection mechanism (6) for detecting traces left by the pencil (100) plowing on the surface of the plate sample, comprising: a brush (61) configured to be able to and only be able to slide into contact with the lead of a pencil (100) that is plowing across the surface of the plate sample, thereby forming an electrical connection with the lead of the pencil (100); A conductive contact piece (62) is fixedly arranged at the clamping position, and the conductive contact piece (62) is configured to be able to contact the portion of the plate sample that is not coated, thereby forming an electrical connection with the plate sample; A conductive detection circuit (63) has two ends electrically connected to the brush (61) and the conductive contact piece (62), respectively; the conductive detection circuit (63) includes a power supply and an alarm.

8. The trailer coating pencil hardness testing device according to claim 7, characterized in that: The sample fixture (5) is provided with a receiving groove (50) on a surface facing the pencil fixture (1) to serve as the clamping position, and the shape of the receiving groove (50) matches the shape of the plate sample.

9. The trailer coating pencil hardness testing device according to claim 8, characterized in that: The conductive contact piece (62) is fixedly arranged on the side wall of the accommodating groove (50), so that the conductive contact piece (62) is configured to be able to contact the end surface of the plate sample.

10. The trailer coating pencil hardness testing device according to claim 7, characterized in that: The conductive detection mechanism (6) further comprises an elastic support rod (64), and the brush (61) is fixedly arranged on the elastic support rod (64); when the brush (61) is in sliding contact with the lead of the pencil (100), the elastic support rod (64) can be elastically bent and deformed based on its own elasticity.

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