Hardness detection device for trailer coating pencil

Abstract

The invention provides a trailer coating pencil hardness detection device which comprises a pencil tool, a moving mechanism and a loading mechanism, the pencil tool is arranged opposite to a to-be-detected plate sample, and the pencil tool is provided with a plurality of clamping positions which are respectively used for clamping pencils with different hardness; the moving mechanism is used for driving the pencil tool and the plate sample to move relatively, so that the pencils can plow the surface of the plate sample in different paths according to the hardness sequence from small to large; and the load mechanism is used for applying a certain load to the pencil or the pencil tool. Compared with the prior art that a robot needs to reciprocate for multiple times to grab pencils with different hardness and requires pencils with different hardness to plow a sample coating in different paths, the scheme saves the time of reciprocating movement of the robot, does not need to set complex movement paths of a plurality of pencils in a program, is low in requirement on the device, and is convenient to operate. And the production cost is also obviously reduced.

Description

Technical Field

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

[0002] A trailer is a vehicle towed by a car without its own driving device. It is a combination of a car (truck or tractor, forklift) and one or more trailers. The truck and tractor are the driving vehicles of the car train, called the main vehicle. The driven vehicle towed by the main vehicle is called a trailer, which is an important type of road transportation. Using car train transportation is the most effective and simple means to improve economic efficiency.

[0003] When trailers are produced, they need to be painted to prevent rust and improve the appearance of the trailers. There are also relevant requirements for the material of the paint coating. Among them, the hardness of the coating is an important parameter that trailer manufacturers cannot ignore, and it is often necessary to conduct relevant tests on the hardness performance of various coatings.

[0004] The patent with publication number CN109556979B discloses a color-coated board pencil hardness tester and a test method, which uses a robot to grab a pencil, sharpen it, and calibrate it to test the pencil hardness of the sample coating. In the above scheme, the robot needs to go back and forth multiple times to grab pencils of different hardness respectively. The robot needs to waste a lot of time in the process of moving back and forth. In addition, in order to ensure the accuracy of the test results, pencils of different hardness need to plow through the sample coating in different paths. Therefore, different moving routes need to be constructed in the robot during one test, which has high requirements for software programming. Summary of the invention

[0005] Based on the above problems existing in the prior art, the present invention aims to solve the technical problems in the prior art of the color-coated plate pencil hardness tester and the detection method, that the robot wastes a lot of time by going back and forth multiple times to grab pencils of different hardness respectively, and that different moving routes need to be constructed in the robot, which has high requirements for software programming.

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

[0007] A pencil fixture, which is arranged opposite to the plate sample to be tested, and has a plurality of clamping positions, respectively used to clamp pencils of different hardness;

[0008] A moving mechanism is used to drive the pencil fixture and the plate sample to move relative to each other, so that the plurality of pencils can plow the surface of the plate sample in order from small to large hardness; the plurality of clamping positions are staggered with each other in the relative moving direction of the pencil fixture and the plate sample, so that the plurality of pencils can plow the surface of the plate sample in different paths respectively;

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

[0010] According to an embodiment of the present invention, the pencil tooling comprises:

[0011] A turntable is arranged opposite to the plate sample to be tested, and a plurality of mounting holes distributed along the circumference are provided on the turntable 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 rotating disk through threads, so as to clamp and fix the pencils in the corresponding mounting holes.

[0013] According to an embodiment of the present invention, the moving mechanism comprises:

[0014] a first mounting seat;

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

[0016] According to an embodiment of the present invention, the loading mechanism comprises:

[0017] A second mounting seat, which is arranged side by side with the first mounting seat;

[0018] A telescopic driving member, fixedly arranged on the second mounting seat;

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

[0020] The two ends of the elastic member are respectively fixedly connected to the output end of the telescopic driving member and the pressure sensing element, 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 also includes a frame, and the first mounting seat is slidably arranged on the frame so that the first mounting seat can move closer to or away from the plate sample to be tested; the second mounting seat is fixedly arranged on the frame.

[0022] According to one embodiment of the present invention, the trailer coating pencil hardness testing device also 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 an embodiment of the present invention, the trailer coating pencil hardness detection device further includes a conductive detection mechanism for detecting the traces of the pencil plowing on the surface of the plate sample, which includes:

[0024] an electric brush configured to be able to and only be able to slide into contact with a lead of the pencil being plowed across the surface of the sheet sample, thereby forming an electrical connection with the lead of the pencil;

[0025] A conductive contact sheet, fixedly disposed at the clamping position, wherein the conductive contact sheet is configured to be able to contact a portion of the sheet sample that is not coated, thereby forming an electrical connection with the sheet 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 the surface of the sample tool facing the pencil tool 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 the side wall of the receiving groove, so that the conductive contact piece is configured to be able to contact the end surface of the plate sample.

[0029] According to an embodiment of the present invention, the conductive detection mechanism further comprises an elastic support rod, and the brush is fixedly arranged on the elastic support rod; when the brush is in sliding contact with the lead of the pencil, 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] In a trailer coating pencil hardness detection device provided by the present invention, the pencil fixture can clamp a plurality of pencils of different hardness at the same time, and the plurality of pencils are arranged to be staggered with each other in the relative moving direction of the pencil fixture and the plate sample, and the moving mechanism can simultaneously drive the plurality of pencils to plow through the plate sample surface in order of hardness from small to large in different paths. Compared with the prior art in which the robot needs to go back and forth multiple times to grab pencils of different hardness respectively, and requires pencils of different hardness to plow through the sample coating in different paths, the present solution saves the time of the robot's back and forth movement, and does not need to set a complex moving path of a plurality of pencils in the program, has low requirements for the device, and significantly reduces the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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.

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

[0034] Figure 2 2 is a schematic diagram of the structure of a pencil tooling in an embodiment of the present invention;

[0035] Figure 3 Schematic diagram of the position state of a pencil on a pencil tool in an embodiment of the present invention;

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

[0037] Figure numerals: 1. pencil tooling; 100. pencil; 11. turntable; 110. mounting hole; 12. knob screw; 2. moving mechanism; 21. first mounting seat; 22. rotating drive member; 3. load mechanism; 31. second mounting seat; 32. telescopic drive member; 33. pressure sensing element; 34. elastic member; 4. frame; 5. sample tooling; 50. receiving groove; 51. negative pressure generator; 52. negative pressure suction hole; 6. conductive detection mechanism; 61. brush; 62. conductive contact piece; 63. conductive detection circuit; 64. elastic support rod. DETAILED DESCRIPTION

[0038] The following descriptions of the embodiments refer to the attached drawings to illustrate specific embodiments in which the present invention can be implemented.

[0039] The present invention provides a trailer coating pencil hardness detection device, the structure of which is as follows: Figure 1 As shown, it comprises a pencil fixture 1, a moving mechanism 2 and a loading mechanism 3, wherein the pencil fixture 1 is arranged opposite to a plate sample to be tested (not shown in the figure), and the pencil fixture 1 has a plurality of clamping positions, which are respectively used to clamp pencils 100 of different hardness; the 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 from small to large hardness; the plurality of clamping positions are staggered with each other in the relative moving 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; the loading mechanism 3 is used to apply a certain load to the pencil 100 or the pencil fixture 1.

[0040] like Figure 2 The figure shows a schematic structural diagram of the pencil tool 1, wherein the pencil tool 1 comprises a turntable 11 and a plurality of knob screws 12, wherein the turntable 11 is arranged opposite to the plate sample to be tested, and a plurality of mounting holes 110 distributed along the circumferential direction are opened on the turntable 11 to serve as the clamping position; the plurality of knob screws 12 are respectively connected to the circumferential side wall of the turntable 11 by threads to clamp and fix the pencil 100 in the corresponding mounting hole 110; the pencil 100 installed in the corresponding mounting hole 110 can be clamped or loosened by screwing in or out the knob screw 12.

[0041] Furthermore, in order to make the multiple clamping positions on the pencil fixture 1 staggered with each other, so that the multiple pencils 100 plow through the surface of the plate sample in different paths, the multiple mounting holes 110 are at different distances from the center of the turntable 11. Specifically, the turntable 11 is provided with 6 mounting holes 110 evenly distributed along the circumference, and the distances of the 6 mounting holes 110 from the center of the turntable 11 gradually decrease in the clockwise direction. The distances of the 6 mounting holes 110 from the center of the turntable 11 are: 40mm, 36mm, 32mm, 28mm, 24mm, 20mm respectively; the 6 mounting holes 110 are respectively installed with the pencils 100a, 100b, 100c, 100d, 100e, 100f, and the hardness of the leads of the 6 pencils 100 gradually increases.

[0042] Furthermore, since the national standard requires that the pencil 100 plows across the surface of the sample to be tested at an angle of 45°, the mounting hole 110 is an inclined hole, and the angle is set to 45°. The state diagram of the pencil 100 installed in the corresponding mounting hole 110 is as shown in FIG. Figure 3 shown.

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

[0044] It is easy to understand that by fixedly connecting the output shaft of the rotary drive member 22 to the center of the turntable 11 to drive the pencil tool 1 to rotate, the moving path of the pencil 100 can be made circular, thereby reducing the overall volume of the device.

[0045] The load mechanism 3 includes a second mounting seat 31, a telescopic driving member 32, a pressure sensing element 33 and an elastic member 34, wherein the second mounting seat 31 is arranged side by side with the first mounting seat 21; the telescopic driving member 32 is fixedly arranged on the second mounting seat 31; the pressure sensing element 33 is fixedly arranged on the side wall of the first mounting seat 21 close to the second mounting seat 31; the two ends of the elastic member 34 are respectively fixedly connected to the output end of the telescopic driving member 32 and the pressure sensing element 33, and the first mounting seat 21 is movably arranged in a direction relative to approaching or moving away from the plate sample. Specifically, the elastic member 34 is a spring, and the rotation driving member 22 is arranged inside the annular area of ​​the spring.

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

[0047] Moreover, in this embodiment, the axial direction of the telescopic driving member 32 is set 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 size of the applied load, and the pressure value sensed by the pressure sensing element 33 can be directly used as the load on the pencil 100 without additional conversion.

[0048] According to one embodiment of the present invention, the trailer coating pencil hardness testing device also includes a frame 4, and the first mounting seat 21 is 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; the second mounting seat 31 is fixedly arranged on the frame 4.

[0049] According to one embodiment of the present invention, the trailer coating pencil hardness testing device further includes a sample fixture 5 for clamping the plate sample to be tested, the sample fixture 5 is arranged side by side with the pencil fixture 1, and the surface of the sample fixture 5 facing the pencil fixture 1 has a clamping position for placing the plate sample to be tested.

[0050] Specifically, the sample fixture 5 has a receiving groove 50 on the surface facing the pencil fixture 1 to serve 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 tested.

[0051] Furthermore, in order to be applicable to the detection of plate samples of various thicknesses, an adjustment plate (not shown in the figure) is provided in the receiving groove 50, which can be moved away from or closer to the pencil tool 1, so as to adjust the depth of the receiving groove 50 according to the thickness of the plate sample to be tested.

[0052] Furthermore, the sample fixture 5 includes a negative pressure generator 51 fixedly mounted on the frame 4, and a negative pressure suction hole 52 is provided on the inner wall of the receiving groove 50, and the negative pressure suction hole 52 is connected to the negative pressure generator 51 through a pipeline. The negative pressure suction hole 52 can adsorb and fix the plate sample to be tested in the receiving groove 50 through the negative pressure adsorption principle.

[0053] Please continue to refer to Figure 1 According to an embodiment of the present invention, the trailer coating pencil hardness detection device further includes a conductive detection mechanism 6 for detecting the traces of the pencil 100 plowing on the surface of the plate sample, which includes a brush 61, a conductive contact piece 62 and a conductive detection circuit 63, wherein the brush 61 is configured to be able to and only be able to slide in contact with a lead of the pencil 100 that is plowing through the surface of the plate sample, thereby forming an electrical connection with the lead of the pencil 100; the conductive contact piece 62 is fixedly arranged at the clamping position, and the conductive contact piece 62 is configured to be able to contact with a portion of the plate sample that is not coated, thereby forming an electrical connection with the plate sample; the structural schematic diagram of the conductive detection circuit 63 is shown as follows 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 sheet sample, the brush 61 slides in contact with the lead of the pencil 100 and is turned on. When the lead of the pencil 100 plows through the coating on the surface of the sheet sample to expose the sheet body (the sheet body is a metal plate, generally an iron plate), the lead of the pencil 100 is turned on by the sheet body, thereby turning on the conductive detection circuit 63, and then 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 make the brush 61 effectively contact with the lead of the pencil 100 plowed 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 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.

[0056] Furthermore, since the end surface of the plate sample generally has no coating, the conductive contact piece 62 is fixedly disposed on the side wall of the receiving groove 50 so that the conductive contact piece 62 is configured to be able to contact the end surface of the plate sample. Preferably, the conductive contact piece 62 is fixedly disposed 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 piece 62 under the action of gravity.

[0057] In order to facilitate the understanding of the present invention, the following Figure 1-Figure 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 , wherein the thickness of the plate sample is 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] Step 2: Install the six pencils 100 of the same size but different lead hardness in the corresponding mounting holes 110 on the rotating disk 11 in order of lead hardness from small to large, and make the leads of the six pencils 100 be in the same plane.

[0060] Step 3, start the telescopic driving member 32, the piston rod of the telescopic driving member 32 extends to push the pencil fixture 1 and the moving mechanism 2 to approach 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, start the rotary drive member 22 to drive the turntable 11 to rotate slowly, so that the six pencils 100 slowly plow through the surface of the plate sample in the order of the hardness of the pencil leads from small to large. When one pencil 100 is plowing through the surface of the plate sample, the lead of the next pencil 100 (a pencil with a larger hardness) is in sliding contact with the surface of the sample fixture 5; in order to avoid wear when the lead of the pencil 100 is in sliding contact with the surface of the sample fixture 5, the sliding contact time should be reduced as much as possible, or the surface of the sample fixture 5 should be set to be sufficiently smooth.

[0062] Step 5, during which, while step 4 is being performed, the conductive detection mechanism 6 performs real-time conductivity detection. When the alarm in the conductive detection circuit 63 sounds an alarm, the rotary drive member 22 stops immediately, and the hardness of the pencil 100 plowing through the surface of the plate sample at this time and the hardness of the pencil 100 plowing through the surface of the plate sample last time are recorded, so that it can be determined 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 (that is, the pencil is re-sharpened), while the unused pencil 100 does not need to be corrected.

[0064] In summary, in a trailer coating pencil hardness detection device provided by the present invention, the pencil fixture 1 can simultaneously clamp a plurality of pencils 100 of different hardnesses, and the plurality of pencils are staggered with each other in the relative moving direction of the pencil fixture 1 and the plate sample, and the moving mechanism 2 can simultaneously drive the plurality of pencils 100 to plow through the surface of the plate sample in order of hardness from small to large in different paths. Compared with the prior art in which the robot needs to go back and forth multiple times to grab pencils of different hardnesses respectively, and requires pencils of different hardnesses to plow through the sample coating in different paths, this solution saves the time of the robot's back and forth movement, and does not need to set a complex moving path of a plurality of pencils in the program, has lower requirements on the device, and significantly reduces the production cost.

[0065] 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 trailer coating pencil hardness testing device, characterized in that: include: A pencil fixture (1) is arranged opposite to a plate sample to be tested, and the pencil fixture (1) has a plurality of clamping positions, respectively used to clamp pencils (100) of different hardness; The 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 increasing hardness; the plurality of clamping positions are arranged in a staggered manner with respect to 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; The load mechanism (3) is used to apply a certain load to the pencil (100) or the pencil tool (1).

2. A trailer coating pencil hardness testing device according to claim 1, characterized in that: 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 circumferential direction to serve as the clamping positions; the plurality of mounting holes (110) are at different distances from the center of the turntable (11); A plurality of knob screws (12) corresponding one to the mounting holes (110) are respectively connected to the circumferential side wall of the rotating disk (11) through threads, so as to clamp and fix the pencil (100) in the corresponding mounting hole (110).

3. A 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 rotating disk (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) 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 arranged 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, and 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 comprises 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 comprises a sample fixture (5) for clamping the plate sample to be tested, the sample fixture (5) and the pencil fixture (1) are arranged side by side, and the surface of the sample fixture (5) facing the pencil fixture (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 the 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 in contact with a lead of the pencil (100) that is plowing through 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; The 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) comprises a power supply and an alarm.

8. The trailer coating pencil hardness testing device according to claim 7, characterized in that: The surface of the sample fixture (5) facing the pencil fixture (1) is provided with a receiving groove (50) 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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