A ballpoint pen tip friction force detection device

Abstract

The invention relates to the technical field of detection devices, and specifically provides a ballpoint pen tip friction detection device, comprising a frame, a workbench is arranged on the frame, writing paper is placed on the workbench, a rotating disk is rotatably arranged on the workbench, a mounting block is slidably arranged at the bottom of the rotating disk, a plurality of transmission cylinders are rotatably connected in the mounting block, a clamp is rotatably connected at the bottom of the transmission cylinder, the clamp clamps the pen tip, the rotating disk drives the pen tip to draw a circle on the writing paper and is not in a vertical state but in an inclined state, which can simulate the state of human hand use, thereby improving the accuracy of friction detection, making the detection result more close to the friction when the human hand is in use, and a large number of pen tips can be detected at one time, greatly improving the detection efficiency, and an adjustment component is arranged on the mounting block, which can adjust the contact force of multiple pen tips on the writing paper, thereby detecting the friction of the pen tip under different pressures.

Description

Technical Field

[0001] The invention relates to the technical field of detection devices, in particular to a ballpoint pen tip friction force detection device. Background Art

[0002] A friction force detection device is an instrument used to measure the friction between two objects. It is usually used to study the friction characteristics of material surfaces, evaluate the contact performance between different surfaces, or test the effects of different materials, coatings or lubricants on friction. The friction force detection device can be used in engineering, materials science, automotive industry and other fields.

[0003] During the production process of ballpoint pens, the nibs of the pens need to undergo layers of testing, among which the friction of the nibs needs to be tested, that is, the friction generated when the nib of the ballpoint pen contacts the paper surface. During the writing process, the friction between the nib and the paper surface directly affects the smoothness and comfort of writing and the release of ink. Excessive friction may make writing feel difficult and may even cause damage to the paper. Too little friction may cause the ink to be released unevenly or cause unclear writing.

[0004] For example, Chinese patent CN217384535U discloses a spring pen writing friction test device based on different pressures. The horizontal driving mechanism of this scheme can drive the spring pen to move in a straight line, so that it can perform a line-drawing writing action on the paper. During the line-drawing process of the spring pen, the pressing mechanism will intermittently trigger the movement, so that the elastic potential energy stored in the elastic energy storage mechanism gradually increases, and the pressure of the spring pen on the paper and the friction between the pen tip and the paper gradually increase. The force monitoring mechanism monitors the pressure information, reflecting the writing feel of the spring pen under different friction conditions.

[0005] However, the above-mentioned testing scheme cannot simulate the use of human hands, and cannot truly reflect the friction force exerted on the pen tip in different usage scenarios. Summary of the invention

[0006] Based on this, it is necessary to provide a ballpoint pen tip friction detection device to address the problem that the current pen tip friction test cannot truly reflect the human hand usage scenario.

[0007] The above purpose is achieved through the following technical solutions:

[0008] A ballpoint pen tip friction force detection device, comprising:

[0009] A frame, wherein a workbench is arranged on the frame, and writing paper is placed on the workbench;

[0010] A rotating disk, the rotating disk is rotatably arranged on the frame, a mounting block is arranged on the lower end surface of the rotating disk, the mounting block can mount a plurality of pen tips, the plurality of pen tips are arranged in a row and spaced apart, the rotating disk rotates to drive the plurality of pen tips to rotate synchronously, and the plurality of pen tips draw circular tracks on the writing paper;

[0011] A driving assembly, wherein the driving assembly can drive the rotating disk to rotate;

[0012] The detection component includes a clamp, a transmission cylinder and a film sensor. The transmission cylinder is rotatably set on the mounting block, the clamp is rotatably connected to the bottom end of the transmission cylinder, the clamp can clamp the pen tip, and the film sensor is sleeved on the outer periphery of the transmission cylinder. During the rotation of the rotating disk, the clamp tilts along the rotation direction of the rotating disk.

[0013] Furthermore, the lower end surface of the rotating disk is provided with a slide groove extending radially thereof, and the mounting block is slidably located in the slide groove. The mounting block can reciprocate in the slide groove during the rotation of the rotating disk, and the clamp and the transmission cylinder change direction as the mounting block reciprocates.

[0014] Furthermore, there are multiple slide grooves, and the multiple slide grooves are arranged in a circular array on the lower end surface of the rotating disk.

[0015] Furthermore, a fixed plate is fixedly provided on the frame, and wave-shaped protrusions are evenly distributed on the outer circumference of the fixed plate. A circular groove is provided at the center position of the lower end surface of the rotating plate, and the circular groove is connected to the slide groove. The fixed plate is located in the circular groove, and one end of the mounting block in the slide groove abuts against the outer circumference of the fixed plate. A first elastic member is provided on the other end of the mounting block, and the first elastic member is connected to the slide groove.

[0016] Furthermore, an adjustment component is provided on the mounting block, and the adjustment component can adjust the contact force of multiple pen tips against the writing paper.

[0017] Furthermore, the adjustment assembly includes an adjustment column, an adjustment rod and multiple second elastic members, there are two adjustment columns, the two adjustment columns are respectively arranged at both ends of the mounting block and the connecting line between the two coincides with multiple pen tips, the two ends of the adjustment rod are connected to the adjustment column and the adjustment rod is connected to one end of multiple second elastic members, the other end of the multiple second elastic members is connected to the upper end of the transmission cylinder, the second elastic member abuts the pen tip against the writing paper, and the adjustment rod moves up and down along the adjustment column to adjust the force of the second elastic member on the pen tip.

[0018] Furthermore, the outer periphery of the adjusting column is threadedly connected with an adjusting ring, the outer periphery of the adjusting ring is rotatably mounted with a connecting ring, the outer periphery of the connecting ring is provided with a hinged rod, one end of the hinged rod is hinged to the outer periphery of the connecting ring, and the other end of the hinged rod is hinged to the adjusting rod.

[0019] Furthermore, the driving assembly includes a driving motor, and a rotating shaft of the driving motor is coaxially and fixedly connected to the rotating disk.

[0020] Furthermore, a lifting frame is provided on the frame, and the lifting frame can drive the rotating disk to move in a vertical direction.

[0021] Furthermore, the lifting frame includes a lifting platform and lifting pillars, the lifting pillars are fixedly arranged on the frame, and a connecting rod is fixedly arranged on the lifting platform. The connecting rod is slidably inserted on the lifting pillars and can slide up and down in the lifting pillars to drive the lifting platform to move in the vertical direction.

[0022] The beneficial effects of the present invention are:

[0023] The present invention provides a rotatable clamp and a transmission cylinder so that the pen tip is not in a vertical state but in an inclined state when drawing a circle on the writing paper, which can simulate the state of human hand use, thereby improving the accuracy of friction force detection, making the detection result more close to the friction force when the human hand is in use, and can detect a large number of pen tips at one time, greatly improving the efficiency of detection.

[0024] The present invention arranges a fixed disk on a frame, and wave-shaped protrusions are evenly distributed on the outer circumference of the fixed disk, so that when the mounting block is driven to rotate by the rotating disk, the pen tip on the mounting block can draw a circular wave shape on the writing paper, which can increase the tilt state of the pen tip, thereby more realistically simulating a human hand.

[0025] The present invention provides an adjustment component, which can adjust the contact force of multiple pen tips against writing paper, so that the friction force of the pen tips under different pressures can be detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of a ballpoint pen tip friction force detection device provided by an embodiment of the present invention;

[0027] Figure 2 A partially exploded view of a ballpoint pen tip friction force detection device provided by an embodiment of the present invention;

[0028] Figure 3 An exploded view of a detection component and an adjustment component of a ballpoint pen tip friction force detection device provided in one embodiment of the present invention;

[0029] Figure 4 for Figure 1 A front view of a ballpoint pen tip friction force detection device provided in an embodiment;

[0030] Figure 5 for Figure 4 A cross-sectional view along AA of a ballpoint pen tip friction force detection device provided in an embodiment;

[0031] Figure 6 for Figure 4 A cross-sectional view of a rotating disk of a ballpoint pen tip friction force detection device provided in an embodiment of the present invention along the AA line;

[0032] Figure 7 for Figure 6 A partial enlarged view of part X of a ballpoint pen tip friction force detection device provided in an embodiment;

[0033] Figure 8 for Figure 7 A partial enlarged view of part Y of a ballpoint pen tip friction force detection device provided in one embodiment;

[0034] Fig. 9 for Figure 7 A partial enlarged view of part Z of a ballpoint pen tip friction force detection device provided in an embodiment;

[0035] Fig.10 A schematic diagram of a cross-sectional structure of a mounting block of a ballpoint pen tip friction force detection device provided in one embodiment of the present invention;

[0036] Fig.11 A schematic diagram of a fixture structure of a ballpoint pen tip friction force detection device provided in one embodiment of the present invention;

[0037] Fig.12 A schematic diagram of the transmission cylinder structure of a ballpoint pen tip friction force detection device provided in one embodiment of the present invention.

[0038] in:

[0039] 100, frame; 110, workbench; 120, lifting frame; 130, lifting support; 140, lifting platform; 150, connecting rod; 160, transmission belt; 170, rotating motor; 180, driving motor;

[0040] 200, rotating disk; 210, slide groove; 220, mounting block; 221, mounting groove; 230, first elastic member; 231, connecting plate; 232, stop plate; 240, cylindrical block; 241, through hole; 250, second elastic member; 260, transmission cylinder; 261, annular protrusion; 262, annular groove; 263, convex ring; 270, thin film sensor; 280, sleeve; 290, clamp; 291, groove; 292, clamping hole; 293, limiting plate;

[0041] 300, fixing plate; 310, wave-shaped protrusion; 320, fixing screw; 330, adjusting column; 340, adjusting rod; 350, adjusting ring; 360, connecting ring; 370, anti-slip ring; 380, hinged rod;

[0042] 400, writing paper;

[0043] 500. Pen tip. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0045] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0046] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0047] Refer to the following Figure 1-Figure 12 A ballpoint pen tip friction force detection device provided by the present invention is described.

[0048] A ballpoint pen tip friction force detection device is suitable for detecting the friction force of a ballpoint pen tip 500, comprising a frame 100, a workbench 110 is arranged on the frame 100, a writing paper 400 is placed on the workbench 110, and the friction force of the pen tip 500 when the pen tip 500 moves on the writing paper 400 can be detected, a rotating disk 200 is rotatably arranged on the frame 100, a mounting block 220 is arranged on the lower end surface of the rotating disk 200, and a plurality of pen tips 500 can be mounted on the mounting block 220, as shown in the specific Figure 3 As shown, multiple pen tips 500 are arranged at intervals and in rows, the tips of the pen tips 500 face the writing paper 400 and abut against the writing paper 400, and when the rotating disk 200 rotates, it can drive the mounting block 220 to rotate, and the mounting block 220 drives the multiple pen tips 500 to rotate synchronously, and the multiple pen tips 500 draw circles on the writing paper 400. A driving assembly is provided on the frame 100, and the driving assembly can drive the rotating disk 200 to rotate and thereby drive the multiple pen tips 500 to draw circles on the writing paper 400.

[0049] In the prior art, the above-mentioned structure is used to detect the friction of the pen tip 500. Multiple pen tips 500 are vertically abutted against the writing paper 400, so that the pen tip 500 can only detect the vertical contact when detecting the friction. Moreover, the pen tip 500 is not necessarily completely perpendicular to the writing paper 400 when the human hand is in use. Therefore, only detecting the friction when the pen tip 500 vertically contacts the writing paper 400 cannot truly reflect the use of the human hand, resulting in the result of the friction detection of the pen tip 500 cannot truly reflect the friction when the human hand is in use.

[0050] Therefore, the present invention is provided with a detection component on the mounting block 220. The detection component can adjust the state of the pen tip 500 so that the pen tip 500 can be closer to the usage state of a human hand when drawing a circle, and the detection component can detect the friction force of the pen tip 500 when it is in different states. The detection component includes a clamp 290, a transmission cylinder 260 and a film sensor 270. The transmission cylinder 260 is rotatably set on the mounting block 220, the clamp 290 is rotatably connected to the bottom end of the transmission cylinder 260, and the film sensor 270 is sleeved on the outer periphery of the transmission cylinder 260. The film sensor 270 can sense the deformation of the transmission cylinder 260. The working principle of the film sensor 270 is based on the piezoelectric effect. When the piezoelectric material is subjected to external mechanical pressure, an electric charge or a potential difference will be generated. The piezoelectric film sensor 270 uses a film made of piezoelectric material as a sensitive element. When an external object applies pressure, the piezoelectric film is deformed, thereby changing its surface charge density or potential difference, so that the sensor outputs a corresponding electrical signal. For example, the film sensor 270 is installed on the outer periphery of the transmission cylinder 260. When the pen tip 500 draws a circle on the writing paper 400, the friction force it receives will be transmitted to the transmission cylinder 260 through the clamp 290, causing the transmission cylinder 260 to be slightly deformed. When the transmission cylinder 260 is slightly deformed, a force can be exerted on the film sensor 270, so that the film sensor 270 can sense the deformation of the transmission cylinder 260, and thus indirectly detect the friction force of the pen tip 500.

[0051] It can be understood that since the pen tip 500 is connected to the transmission cylinder 260 through the clamp 290, the outer periphery of the transmission cylinder 260 is set not to contact the mounting block 220, and only the top of the transmission cylinder 260 is rotatably connected to the mounting block 220. Therefore, when the rotating disk 200 rotates, the pen tip 500 is driven by the transmission cylinder 260 and the clamp 290 to draw a circle on the writing paper 400. At this time, the friction force exerted on the pen tip 500 will be transmitted to the transmission cylinder 260 through the clamp 290. When the transmission cylinder 260 is subjected to the force, the surface will deform, and the thin film sensor 270 on the surface of the transmission cylinder 260 can detect the deformation of the surface of the transmission cylinder 260, thereby indirectly detecting the friction force exerted on the pen tip 500.

[0052] To facilitate the rotation of the clamp 290 connected to the bottom of the transmission cylinder 260, as shown in FIG. Fig.11 and Fig.12As shown, a ring groove 262 is provided at the bottom of the transmission cylinder 260, and the shape of the clamp 290 is cylindrical. The clamp 290 is rotatably connected in the ring groove 262, and the size of the ring groove 262 is larger than half of the cylindrical clamp 290. A convex ring 263 is provided on the inner wall of the ring groove 262, and a groove 291 is provided on the outer periphery of the cylindrical clamp 290. When the cylindrical clamp 290 is located in the ring groove 262, it cannot be separated from the ring groove 262 along the radial direction of the ring groove 262, and the cylindrical clamp 290 can rotate around its own axis in the ring groove 262. At the same time, a clamping hole 292 is provided on the clamp 290, and the pen tip 500 is inserted into the clamping hole 292 to fix the pen tip 500, or a clamp 290 made of magnetic material is provided. If the pen tip 500 can be absorbed Appendix: The pen tip 500 is fixed by magnetic adsorption. If adsorption is not possible, a clamp 290 with a clamping hole 292 is used to clamp the pen tip 500. After the pen tip 500 is clamped, the rotating disk 200 drives the mounting block 220 to rotate, and the pen tip 500 can be tilted along the rotation direction of the rotating disk 200. The reason for the tilt is the rotating clamp 290, and in order to adapt to drawing circles, the transmission cylinder 260 can also rotate accordingly so that the pen tip 500 can draw a circle in a tilted state, thereby more realistically simulating the state of a human hand using the pen tip 500 to draw a circle, so that the deformation of the transmission cylinder 260 sensed by the film sensor 270 can more realistically reflect the state of friction applied to the human hand when using it.

[0053] It should be noted that the clamp 290 rotates along the extension direction of the convex ring 263, that is, when the clamp 290 rotates, the convex ring 263 slides in the groove 291. In order to limit the rotation angle of the clamp 290, a limiting plate 293 is fixedly provided at the lower end of the clamp 290. There is a gap between the limiting plate 293 and the bottom end of the transmission cylinder 260. When the clamp 290 rotates to the point where the limiting plate 293 abuts against the bottom end of the transmission cylinder 260, the rotation is restricted, thereby preventing the clamp 290 from rotating at a larger angle.

[0054] At the same time, in order to prevent the film sensor 270 on the periphery of the transmission cylinder 260 from being affected by other factors, such as Figure 3 , Fig. 9 , Fig.10 and Fig.12As shown, an annular protrusion 261 is provided on the outer periphery of the top of the transmission cylinder 260, and a mounting groove 221 for placing the transmission cylinder 260 is opened on the mounting block 220. When the transmission cylinder 260 is placed in the mounting groove 221, the annular protrusion 261 on the top of the transmission cylinder 260 is just matched with the inner wall of the mounting groove 221, so that the top of the transmission cylinder 260 cannot move radially relative to the mounting groove 221, and a sleeve 280 is provided on the inner wall of the mounting groove 221 and below the annular protrusion 261. There is a gap between the inner periphery of the sleeve 280 and the outer periphery of the transmission cylinder 260, and the film sensor 270 on the outer periphery of the transmission cylinder 260 will not contact the inner periphery of the sleeve 280, thereby avoiding affecting the film sensor 270.

[0055] In a further embodiment, in order to further increase the tilting states of the pen tip 500, so that the pen tip 500 is not limited to drawing circles, but can draw more complex shapes. A slide groove 210 extending along its radial direction is provided on the lower end surface of the rotating disk 200, and the mounting block 220 is slidably arranged in the slide groove 210. The mounting block 220 can move along the slide groove 210. Specifically, during the rotation of the rotating disk 200, the mounting block 220 reciprocates along the slide groove 210 so that multiple pen tips 500 can draw annular wavy curves, and during the reciprocating movement of the mounting block 220, the multiple pen tips 500 on the mounting block 220 will drive the clamp 290 and the transmission cylinder 260 to rotate, thereby changing the tilting state of the pen tip 500 when in contact with the writing paper 400, and thus being able to more comprehensively detect the friction force in various tilting states.

[0056] In a further embodiment, the present invention has multiple slide grooves 210. In this embodiment, two slide grooves 210 are taken as an example. A mounting block 220 is provided in each slide groove 210, and multiple pen tips 500 are installed on the multiple mounting blocks 220 at the same time, thereby increasing the number of pen tips 500 to be detected, so that a large number of pen tips 500 can be detected at one time, thereby improving the detection efficiency.

[0057] Specifically, in the embodiment of the present invention, a fixed plate 300 is provided to realize the reciprocating movement of the above-mentioned mounting block 220 in the slide groove 210. The fixed plate 300 is fixedly provided on the frame 100. The outer peripheral surface of the fixed plate 300 has uniformly distributed wave-shaped protrusions 310. A circular groove is provided at the center position of the lower end surface of the rotating plate 200. When the rotating plate 200 is located on the frame 100, the fixed plate 300 on the frame 100 is located in the circular groove, and the circular groove is connected to the slide groove 210, so that the mounting block 220 in the slide groove 210 can be reciprocated. The mounting block 220 can contact the outer periphery of the fixed disk 300, and a first elastic member 230 is provided on one end of the mounting block 220, and the other end of the first elastic member 230 is connected to the slide groove 210. When the rotating disk 200 rotates, it can drive the mounting block 220 to rotate synchronously. The fixed disk 300 is fixed on the frame 100, so the end of the mounting block 220 abutting against the outer periphery of the fixed disk 300 can reciprocate in the slide groove 210 under the action of the wavy protrusion 310 on the outer periphery of the fixed disk 300.

[0058] More specifically, a wedge block is provided on one end of the mounting block 220 that abuts against the outer periphery of the fixed disk 300 . The provision of the wedge block enables the rotating disk 200 to reciprocate more smoothly in the slide groove 210 during the rotation process.

[0059] It should be noted that in order to prevent the mounting block 220 from falling off the slide groove 210, Figure 2 As shown, a stop plate 232 is detachably connected to one side of the slide groove 210 near the outer periphery of the rotating disk 200, and the stop plate 232 is connected to the rotating disk 200 by bolts. The stop plate 232 can effectively prevent the mounting block 220 from being separated from the slide groove 210, and a connecting plate 231 is provided on the mounting block 220 near one end of the wedge block, and the connecting plate 231 is connected to one end of the first elastic member 230, and the other end of the first elastic member 230 abuts against the stop plate 232. In this embodiment, the fixed disk 300 is fixed to the workbench 110 by fixing screws 320, and a connecting hole is opened at the center of the fixed disk 300, and the fixing screws 320 are inserted into the connecting hole to fix the fixed disk 300 to the workbench 110.

[0060] In a further embodiment, in order to be able to adjust the contact force of the multiple pen tips 500 against the writing paper 400, an adjustment component is further provided on the mounting block 220, and the adjustment component is used to adjust the contact force of the multiple pen tips 500 against the writing paper 400.

[0061] Specifically, the adjustment component includes an adjustment column 330, an adjustment rod 340 and a plurality of second elastic members 250. The adjustment column 330 is fixedly arranged on the upper end surface of the mounting block 220 and there are two adjustment columns 330. The two adjustment columns 330 are respectively located at the two ends of the upper end surface of the mounting block 220, and the connecting line of the two adjustment columns 330 coincides with the plurality of pen tips 500. The two ends of the adjustment rod 340 are connected to the adjustment column 330 and one end of the plurality of second elastic members 250 is connected to the adjustment rod 340. The other ends of the plurality of second elastic members 250 abut against the upper end of the transmission cylinder 260, so that the second elastic member 250 pushes the transmission cylinder 260 so that the pen tip 500 on the clamp 290 can abut against the writing paper 400. By changing the distance between the two ends of the adjusting rod 340 on the adjusting column 330, the contact force of the second elastic member 250 against the transmission cylinder 260 can be adjusted, thereby changing the contact force of the pen tip 500 against the writing paper 400. When the adjusting rod 340 moves upward on the two adjusting columns 330, the length of the multiple second elastic members 250 increases, the contact force of the second elastic member 250 against the transmission cylinder 260 decreases, and the force of the pen tip 500 against the writing paper 400 decreases; when the adjusting rod 340 moves downward on the two adjusting columns 330, the length of the multiple second elastic members 250 shortens, the contact force of the second elastic member 250 against the transmission cylinder 260 increases, and the force of the pen tip 500 against the writing paper 400 increases.

[0062] More specifically, in order to facilitate changing the position of the adjustment rod 340 on the adjustment column 330, an adjustment ring 350 is threadedly connected to the adjustment column 330, and a connecting ring 360 is rotatably installed on the outer periphery of the adjustment ring 350. A hinged rod 380 is hinged on the outer periphery of the connecting ring 360, and the other end of the hinged rod 380 is hinged on the adjustment rod 340, and an anti-slip ring 370 is provided at the upper end of the rotating ring. The anti-slip ring 370 prevents the adjustment ring 350 from detaching from the connecting ring 360. When the adjustment ring 350 rotates on the adjustment column 330, the height of the adjustment ring 350 on the adjustment column 330 can be changed. The adjustment ring 350 does not drive the connecting ring 360 to rotate synchronously, but drives the connecting ring 360 to move synchronously in the vertical direction on the adjustment column 330, so that the connecting ring 360 drives the two ends of the adjustment rod 340 to move.

[0063] It should be noted that in order to facilitate the connection between the second elastic member 250 and the adjusting rod 340, a cylindrical block 240 is fixedly connected to the upper end of the second elastic member 250, and a through hole 241 is opened on the outer periphery of the cylindrical block 240. The through hole 241 penetrates the cylindrical block 240 along the radial direction, and the adjusting rod 340 passes through the through hole 241 to connect each cylindrical block 240.

[0064] In a further embodiment, the driving assembly of the present invention includes a driving motor 180, a lifting frame 120 is arranged on the frame 100, the driving motor 180 is fixedly arranged on the lifting frame 120, the rotating shaft of the driving motor 180 is coaxial with the rotating disk 200 and is fixedly connected, and when the driving motor 180 rotates, the rotating disk 200 is driven to rotate.

[0065] Specifically, the lifting frame 120 includes a lifting platform 140 and a lifting column 130. A connecting rod 150 is fixedly arranged on the lifting platform 140. The connecting rod 150 is perpendicular to the lifting platform 140 and is slidably inserted in the lifting column 130. The lifting column 130 is fixedly arranged on the frame 100. A transmission belt 160 and a rotating motor 170 are arranged on the outer periphery of the lifting column 130. The rotating shaft of the rotating motor 170 is transmission-connected with the transmission belt 160. The rotating motor 170 rotates to drive the transmission belt 160 to rotate. The transmission belt 160 is connected to the connecting rod 150 slidably inserted in the support column. Therefore, when the rotating motor 170 drives the transmission belt 160 to rotate, it can drive the connecting rod 150 to slide in the lifting column 130, so that the lifting platform 140 can be lifted and lowered. The driving motor 180 on the lifting platform 140 drives the rotating disk 200 to move vertically on the workbench 110, which is convenient for installing the writing paper 400 and the pen head 500.

[0066] It should be noted that when installing the pen tip 500 and the writing paper 400, the lifting platform 140 is raised so that the rotating disk 200 is separated from the workbench 110, and then the writing paper 400 is installed on the workbench 110, and then the mounting block 220 with the pen tip 500 installed is installed in the slide groove 210, and finally the stop plate 232 is installed on the outer periphery of the rotating disk 200.

[0067] The specific working process of a ballpoint pen tip friction force detection device provided by the present invention is described in combination with the above embodiments:

[0068] Installing the writing paper 400 and the pen tip 500:

[0069] The rotating motor 170 rotates to drive the transmission belt 160 to rotate, and the transmission belt 160 drives the connecting rod 150 to rise in the lifting pillar 130, and the connecting rod 150 drives the lifting platform 140 to rise, and the lifting platform 140 drives the driving motor 180 and the rotating disk 200 to rise, and the rotating disk 200 is separated from the workbench 110. After the writing paper 400 is laid on the workbench 110, the fixed disk 300 is fixed on the workbench 110 by the fixing screws 320, and the fixed disk 300 is stationary relative to the workbench 110, and then a plurality of pen tips 500 are inserted into the clamping holes 292 of the clamp 290 in sequence, and the pen tips 500 are limited by the clamping holes 292 of the clamp 290, and the clamp 290, the transmission cylinder 260 and the sleeve 2 80 is installed on the mounting block 220, and the adjusting ring 350 is rotated to adjust the height of the adjusting rod 340 on the adjusting column 330 to adjust the abutment force of the pen tip 500 on the writing paper 400. After the adjustment is completed, the stop plate 232 on the outer periphery of the rotating disk 200 is removed, and the mounting block 220 is installed in the slide groove 210 of the rotating disk 200. Then the stop plate 232 is installed on the outer periphery of the rotating disk 200 to prevent the mounting block 220 from escaping from the slide groove 210. Finally, the motor 170 is rotated in the reverse direction to drive the rotating disk 200 to reset, so that the rotating disk 200 is located on the workbench 110, and the fixed disk 300 on the workbench 110 is located in the circular groove of the rotating disk 200. At this point, the writing paper 400 and the pen tip 500 are installed.

[0070] Start testing:

[0071] The driving motor 180 rotates to drive the rotating disk 200 to rotate, and the rotating disk 200 drives multiple mounting blocks 220 to rotate, and the mounting blocks 220 drive multiple pen tips 500 to rotate. When the pen tip 500 rotates, since the clamp 290 that clamps the pen tip 500 is rotatably connected to the transmission cylinder 260, and the transmission cylinder 260 is not restricted by rotation in the mounting groove 221 on the mounting block 220, the pen tip 500 tilts when the rotating disk 200 rotates, and the limiting plate 293 on the clamp 290 limits the tilt angle of the clamp 290, which also limits the tilt angle of the pen tip 500, thereby simulating the state of a human hand drawing a circle. After the pen tip 500 is tilted, the friction force it receives when drawing a circle on the writing paper 400 is transmitted to the transmission cylinder 260 through the clamp 290. Specifically, the limiting plate 293 abuts against the transmission cylinder 260, thereby transmitting the force to the transmission cylinder 260, so that The transmission cylinder 260 is deformed by the force. Since a thin film sensor 270 is provided on the periphery of the transmission cylinder 260, the thin film sensor 270 can detect the slight deformation of the transmission cylinder 260 and thus detect the friction force exerted on the pen tip 500. As the rotating disk 200 rotates, one end of the mounting block 220 will pass through the wavy protrusion 310 on the periphery of the fixed disk 300. After passing through the wavy protrusion 310, the mounting block 220 will be pushed outward radially along the fixed disk 300, squeezing the first elastic member 230 on the mounting block 220. At this time, the transmission cylinder 260 connected to the clamp 290 will deflect with the radial movement of the mounting block 220, thereby adapting to the radial movement of the mounting block 220. The pen tip 500 draws a circular wavy line on the writing paper 400, thereby increasing the tilt state of the pen tip 500, so that the pen tip 500 can simulate more situations, and the friction force detection of the pen tip 500 is completed.

[0072] replace:

[0073] After the detection is completed, the rotating disk 200 is raised, the stop plate 232 on the outer periphery of the rotating disk 200 is removed, the mounting block 220 is taken out from the slide groove 210, the pen head 500 on the mounting block 220 is replaced, and the fixed disk 300 is removed from the workbench 110, and the writing paper 400 is replaced. After the replacement is completed, the rotating disk 200 is reset to start a new round of detection.

[0074] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A ballpoint pen tip friction force detection device, characterized in that: include: A frame, wherein a workbench is arranged on the frame, and writing paper is placed on the workbench; A rotating disk, the rotating disk is rotatably arranged on the frame, a mounting block is arranged on the lower end surface of the rotating disk, the mounting block can mount a plurality of pen tips, the plurality of pen tips are arranged in a row and spaced apart, the rotating disk rotates to drive the plurality of pen tips to rotate synchronously, and the plurality of pen tips draw circular tracks on the writing paper; A driving assembly, wherein the driving assembly can drive the rotating disk to rotate; A detection component, the detection component includes a fixture, a transmission cylinder and a film sensor, the transmission cylinder is rotatably arranged on the mounting block, the fixture is rotatably connected to the bottom end of the transmission cylinder, the fixture can clamp the pen head, the film sensor is sleeved on the outer periphery of the transmission cylinder, and during the rotation of the rotating disk, the fixture is tilted along the rotation direction of the rotating disk; The lower end surface of the rotating disk is provided with a slide groove extending radially thereof, and the mounting block is slidably located in the slide groove. The mounting block can reciprocate in the slide groove during the rotation of the rotating disk, and the clamp and the transmission cylinder change direction as the mounting block reciprocates.

2. The ballpoint pen tip friction force detection device according to claim 1, characterized in that: There are a plurality of slide grooves, which are arranged in a circular array on the lower end surface of the rotating disk.

3. The ballpoint pen tip friction force detection device according to claim 1, characterized in that: A fixed plate is fixedly arranged on the frame, and wave-shaped protrusions are evenly distributed on the outer circumference of the fixed plate. A circular groove is opened at the center position of the lower end surface of the rotating plate, and the circular groove is connected with the slide groove. The fixed plate is located in the circular groove, and one end of the mounting block in the slide groove abuts against the outer circumference of the fixed plate. A first elastic member is arranged on the other end of the mounting block, and the first elastic member is connected to the slide groove.

4. The ballpoint pen tip friction force detection device according to claim 1, characterized in that: The mounting block is provided with an adjustment component, and the adjustment component can adjust the contact force of multiple pen tips against the writing paper.

5. The ballpoint pen tip friction force detection device according to claim 4, characterized in that: The adjustment assembly includes an adjustment column, an adjustment rod and multiple second elastic members. There are two adjustment columns, which are respectively arranged at both ends of the mounting block and the connecting line of the two adjustment columns coincides with multiple pen tips. Both ends of the adjustment rod are connected to the adjustment column and the adjustment rod is connected to one end of multiple second elastic members, and the other end of the multiple second elastic members is connected to the upper end of the transmission cylinder. The second elastic member abuts the pen tip against the writing paper, and the adjustment rod moves up and down along the adjustment column to adjust the force of the second elastic member on the pen tip.

6. The ballpoint pen tip friction force detection device according to claim 5, characterized in that: The outer periphery of the adjusting column is threadedly connected with an adjusting ring, the outer periphery of the adjusting ring is rotatably mounted with a connecting ring, the outer periphery of the connecting ring is provided with a hinged rod, one end of the hinged rod is hinged to the outer periphery of the connecting ring, and the other end of the hinged rod is hinged to the adjusting rod.

7. The ballpoint pen tip friction force detection device according to claim 1, characterized in that: The driving assembly comprises a driving motor, the rotating shaft of which is coaxially and fixedly connected to the rotating disk.

8. The ballpoint pen tip friction force detection device according to claim 1, characterized in that: The frame is provided with a lifting frame, and the lifting frame can drive the rotating disk to move in a vertical direction.

9. The ballpoint pen tip friction force detection device according to claim 8, characterized in that: The lifting frame includes a lifting platform and lifting pillars, wherein the lifting pillars are fixedly arranged on the frame, and a connecting rod is fixedly arranged on the lifting platform. The connecting rod is slidably inserted on the lifting pillars and can slide up and down in the lifting pillars to drive the lifting platform to move in the vertical direction.

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