CN108872064B - Writing tool friction force testing device and testing method thereof - Google Patents
Writing tool friction force testing device and testing method thereof Download PDFInfo
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- CN108872064B CN108872064B CN201810385641.1A CN201810385641A CN108872064B CN 108872064 B CN108872064 B CN 108872064B CN 201810385641 A CN201810385641 A CN 201810385641A CN 108872064 B CN108872064 B CN 108872064B
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- paper
- sleeve
- writing
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- cantilever beam
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
Abstract
The invention discloses a friction force testing device and a friction force testing method for a writing tool.
Description
Technical Field
The invention relates to the technical field of friction testing devices, in particular to a writing tool friction force testing device and a testing method thereof.
Background
During writing, the writing instrument comes into contact with the paper surface and generates frictional force. The amount of tip friction of the writing instrument is closely related to the writing experience of the writer.
In the case of pens, the pen industry, the collection community, has formed a relatively fixed set of terms describing the perception of writing smoothness: smooth, cool, old quick, slightly damped, astringent, hard and smooth, "hot knife cut butter" feel, etc., but the description of writing feel is too subjective. At present, regarding hand feeling comfort or writing hand feeling in the writing process of a pen point, a uniform quantitative detection method is not available, and in most cases, professional technicians with abundant writing experiences are relied on to perform repeated writing comparison under different test conditions, and qualitative scoring judgment is performed through personal feeling.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a solution to the above-mentioned drawbacks of the prior art
A friction force testing device and a testing method for a writing tool aim to test the friction coefficient of the writing tool when the writing tool writes on paper so as to judge the writing hand feeling of the writing tool.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a friction force testing device for a writing tool comprises a base and the writing tool, wherein a displacement adjusting device, a paper bearing platform, a driving device, a data acquisition device and a computer are arranged on the base, a cantilever beam is arranged on the displacement adjusting device, a strain gauge component is arranged on the cantilever beam, a load adjusting device is arranged at the top of the front end of the cantilever beam, a clamping device is arranged at the bottom of the front end of the cantilever beam, paper and a paper pre-tightening device which is connected with the paper and stretches the paper are arranged on the paper bearing platform, the clamping device is used for clamping and positioning the writing tool and enabling the writing tool to incline at a preset writing angle relative to the paper, the driving device is connected with the paper bearing platform and drives the paper bearing platform to reciprocate, and the driving device is also connected with the computer, the strain gauge assembly, the data acquisition device and the computer are sequentially connected.
The writing instrument friction force testing device, wherein the clamping device comprises: the device comprises a sleeve, a connecting column and a plurality of limiting parts; the upper end and the lower end of the sleeve are both opened; the connecting column is fixedly arranged on the outer surface of the sleeve and is vertically connected with the cantilever beam; the sleeve is provided with a plurality of threaded through holes, the limiting part is provided with external threads, and the external threads are matched with the threaded through holes so that one end of the limiting part is arranged in the sleeve.
The friction force testing device for the writing tool is characterized in that the writing tool is a pen core, the pen core penetrates through the sleeve, and the limiting piece supports against the pen core.
Writing instrument frictional force testing arrangement, wherein, writing instrument is the pen nib, be provided with the installed part in the telescopic lower extreme opening, the one end of installed part is arranged in the sleeve outside and with the pen nib is connected, the installed part is used for following sleeve upper end opening injected ink transmits for the pen nib, the locating part top is held the installed part.
The writing instrument friction testing device, wherein, paper load-bearing platform includes: the paper pressing device comprises a moving table, a bottom plate arranged on the upper surface of the moving table, an object placing table arranged on the upper surface of the bottom plate, and a first paper pressing plate arranged above the object placing table and connected with the object placing table; the paper is positioned between the object placing table and the first paper pressing plate and can slide in a reciprocating manner; the first paper pressing plate is provided with a plurality of hollows used for exposing the paper.
The friction force testing device for the writing tool comprises a paper pre-tightening device, a paper pre-tightening device and a control device, wherein the paper pre-tightening device comprises a first paper rolling mechanism and a second paper rolling mechanism which are symmetrically arranged on two sides of a bottom plate, two ends of paper are respectively connected with the first paper rolling mechanism and the second paper rolling mechanism, and the first paper rolling mechanism and the second paper rolling mechanism roll the two ends of the paper in a direction away from the bottom plate.
The writing instrument friction force testing device, wherein the first paper winding mechanism includes: the winding device comprises a bracket, a first circular ring, a second circular ring, a hollow column, a rotating shaft and a paper winding drum, wherein the first circular ring and the second circular ring are symmetrically arranged; one end of the hollow column is inserted into the first circular ring, and the other end of the hollow column is provided with an opening and faces the second circular ring; the first end of the rotating shaft is inserted into the hollow column from the opening and can slide along the hollow column in a reciprocating mode, and the second end of the rotating shaft penetrates through the second circular ring; the first end of the rotating shaft is connected with the hollow column through an elastic piece, and the deformation direction of the elastic piece is parallel to the sliding direction of the rotating shaft; a plurality of tooth sockets are arranged on the inner wall of the second ring, and a plurality of tooth tips meshed with the tooth sockets are arranged on the outer wall of the rotating shaft; the paper winding drum is sleeved on the hollow column; and a clamping groove meshed with the tooth tip is formed in the inner wall of the paper winding tube.
The writing tool friction force testing device is characterized in that the strain gauge component comprises a first strain gauge and a second strain gauge which are symmetrically arranged on the upper surface and the lower surface of the cantilever beam; the first strain gauge and the second strain gauge are used for measuring load information borne by the paper according to the deformation amount of the cantilever beam when the displacement adjusting device adjusts the load of the writing tool on the paper by adjusting the height of the cantilever beam.
The friction force testing device for the writing tool is characterized in that the data acquisition device comprises a bridge box, a signal amplifier and a data acquisition card which are sequentially connected; the bridge box is connected with the strain gauge component; the data acquisition card is connected with the computer.
A test method based on a writing tool friction force test device comprises the following steps: respectively clamping and fixing the writing tool and the paper;
the position adjustment and the load adjustment are carried out on the writing tool through the displacement adjusting device;
and starting a driving device, acquiring load information and friction force information by the strain sheet assembly, analyzing and recording the load information and the friction force information by using a data acquisition device connected with the strain sheet assembly, and calculating and acquiring a friction coefficient by using a computer connected with the data acquisition device.
Has the advantages that: according to the invention, the writing tool is installed through the clamping device and is positioned, so that the writing tool is inclined relative to the paper at a preset writing angle, the state of a person holding the writing tool to write on the paper is simulated, and the writing hand feeling of the writing tool is judged by acquiring the friction coefficient through acquiring the load and the friction force between the writing tool and the paper.
Drawings
FIG. 1 is a schematic view of a friction force testing device for a writing instrument according to the present invention;
FIG. 2 is a reference view showing a state in which the displacement adjusting means is assembled with the holding means in the present invention;
FIG. 3 is an assembly view of the writing instrument and the holding device when the writing instrument is a pen core according to a first preferred embodiment of the present invention;
FIG. 4 is an exploded view of the holder when the writing instrument is a pen nib according to a second preferred embodiment of the present invention;
FIG. 5 is a reference view showing a state of use in assembling the driving device with the sheet carrying platform according to the present invention;
FIG. 6 is a schematic view of the first winding mechanism of the present invention;
FIG. 7 is a reference view showing a state of use in assembling the hollow post with the bracket according to the present invention;
FIG. 8 is a schematic view of the construction of the spindle according to the present invention;
fig. 9 is a reference view showing a state in which the rotary shaft, the hollow post and the bracket are assembled in use according to the present invention;
FIG. 10 is a reference view showing a state of use in the present invention in which the tooth tip is engaged with the tooth socket.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Please refer to fig. 1-10. The invention provides a friction force testing device for a writing tool, which comprises a base 1 and the writing tool 2, wherein a displacement adjusting device 3, a paper bearing platform 4, a driving device 5, a data acquisition device 6 and a computer 100 are arranged on the base 1, a cantilever beam 7 is arranged on the displacement adjusting device 3, a strain gauge component 8 is arranged on the cantilever beam 7, a clamping device 9 is arranged at the bottom of the front end of the cantilever beam 7, paper 200 and a paper pre-tightening device 10 which is connected with the paper 200 and stretches the paper 200 are arranged on the paper bearing platform 4, the clamping device 9 is used for clamping and positioning the writing tool 2 and enabling the writing tool 2 to incline at a preset writing angle relative to the paper 200, the driving device 5 is connected with the paper bearing platform 4 and drives the paper bearing platform 4 to reciprocate, the driving device 5 is further connected with the computer 100, and the strain gauge assembly 8, the data acquisition device 6 and the computer 100 are sequentially connected.
The clamping device 9 is connected with the displacement adjusting device 3 through the cantilever beam 7, the displacement adjusting device 3 adjusts the position of the clamping device 9 by adjusting the displacement of the cantilever beam 7, and after the writing tool 2 is installed in cooperation with the clamping device 9, the writing tool 2 can be adjusted to be above the paper bearing platform 4 through the displacement adjusting device 3 and is in contact with the paper 200 placed on the paper bearing platform 4; the downward movement distance of the cantilever beam 7 is further adjusted through the displacement adjusting device 3 to adjust the load pressure of the writing tool 2 on the paper 200, so that the writing tool 2 is in close contact with the paper 200; the driving means 5 is activated, and the driving means 5 reciprocates the paper 200 while the writing instrument 2 is kept stationary, thereby simulating a writing state.
Further, since the writing tool 2 may be inclined at a certain angle and not perpendicular to the paper 200 when people use the writing tool 2 for writing, in order to provide more accurate test data for determining the hand feeling of the writing tool 2, the clamping device 9 of the present invention is further configured to position the writing tool 2 such that the writing tool 2 is inclined at a predetermined writing angle with respect to the paper 200, thereby simulating a state in which a person holds the writing tool 2 to write on the paper 200.
As shown in fig. 1, the data acquisition device 6 is connected to the strain gauge assembly 8, and is configured to acquire, through the strain gauge assembly 8, a friction force generated between the paper 200 and the writing instrument 2 when the paper moves back and forth and a load borne by the writing instrument 2, and the data acquisition device 6 sends the friction force data and the load data to the computer 100, and calculates a corresponding friction coefficient through the computer 100, so as to provide a basis for determining a hand feeling of writing of the writing instrument 2.
As shown in fig. 2, the displacement adjusting device 3 includes a triaxial displacement table 31 and an adapter bracket 32, and the adapter bracket 32 is fixedly disposed on the triaxial displacement table 31 and is used for mounting the cantilever beam 7. The three-axis displacement table 31 can perform adjustment of an X axis (front-back direction), a Y axis (left-right direction), and a Z axis (up-down direction) to adjust the writing tool 2 right above the paper 200 and to contact the paper 200; wherein, the front, back, left, right, up and down directions are as shown in figure 1.
As shown in fig. 3 and 4, the holding device 9 includes: a sleeve 91, a connecting column 92 and a plurality of limiting pieces 93; the upper end and the lower end of the sleeve 91 are both open; the connecting column 92 is fixedly arranged on the outer surface of the sleeve 91 and is vertically connected with the cantilever beam 7; a plurality of threaded through holes are formed in the sleeve 91, external threads are formed on the limiting piece 93, and the external threads are matched with the threaded through holes so that one end of the limiting piece 93 is arranged in the sleeve 91; the included angle between the connecting column 92 and the sleeve 91 is equal to the preset writing angle.
The writing tool 2 is a pen core (such as a self-contained writing tool 2 of a fountain pen core, a self-contained ball-point pen core and the like) or a pen point (without self-contained ink, the ink is required to be provided from the outside).
In the first preferred embodiment: as shown in fig. 3, the writing tool 2 is a cartridge, and the connecting post 92 is used to connect the sleeve 91 with the cantilever beam 7 while positioning the sleeve 91 in an inclined state so that the sleeve 91 is inclined at the preset writing angle with respect to the paper 200; the sleeve 91 is used for mounting the pen core, and the limiting piece 93 is used for limiting the pen core in the sleeve 91. The preset writing angle is an acute angle, and preferably, the preset writing angle is larger than 30 degrees and smaller than 90 degrees.
The upper end and the lower end of the sleeve 91 are provided with openings, the pen core penetrates into the sleeve 91 from the upper end opening of the sleeve 91 and penetrates out from the lower end opening of the sleeve 91, and the tip end of the pen core is exposed out of the sleeve 91 so as to be in contact with the paper 200; the limiting member 93 is screwed into the threaded through hole by matching the external thread with the threaded through hole, one end of the limiting member 93 is inserted into the sleeve 91 to be in contact with the refill, and the abutting force of the limiting member 93 against the refill is increased along with the increase of the screwing depth of the limiting member 93 into the threaded through hole, so that the refill is positioned in the sleeve 91.
In a preferred embodiment, a first measuring disc 94 is disposed on the connecting column 92, the first measuring disc 94 has a central hole and is sleeved on the connecting column 92, the first measuring disc 94 is perpendicular to the connecting column 92, a mounting hole is disposed at the bottom of the front end of the cantilever beam 7, when the connecting column 92 is inserted into the mounting hole and completely fits with the mounting hole, the upper surface of the first measuring disc 94 contacts with the lower surface of the cantilever beam 7 to ensure that the connecting column 92 is completely perpendicular to the cantilever beam 7, thereby ensuring that the inclination angle of the pen core relative to the paper 200 is equal to the preset writing angle. That is, the first dial 94 is used to measure whether the pen core is inclined at the preset writing angle with respect to the paper 200.
The second preferred embodiment: as shown in fig. 4, the writing tool 2 is a pen nib, the upper end and the lower end of the sleeve 91 are both open, a mounting part 95 is arranged in the lower end opening of the sleeve 91, one end of the mounting part 95 is arranged outside the sleeve 91 and connected with the pen nib, the mounting part 95 is used for transmitting ink injected from the upper end opening of the sleeve 91 to the pen nib, and the limiting part 93 supports against the mounting part 95. The mount 95 is reciprocally slidable relative to the sleeve 91; the limiting member 93 is used for limiting the mounting member 95 in the sleeve 91.
The connecting column 92 is provided with a second measuring disc 96, the second measuring disc 96 is provided with a central hole and is sleeved on the connecting column 92, the second measuring disc 96 is perpendicular to the connecting column 92, the bottom of the front end of the cantilever beam 7 is provided with a mounting hole, when the connecting column 92 is inserted into the mounting hole and is completely matched with the mounting hole, the upper surface of the second measuring disc 96 is contacted with the lower surface of the cantilever beam 7 so as to ensure that the connecting column 92 is completely perpendicular to the cantilever beam 7, and further ensure that the inclination angle of the refill relative to the paper 200 is equal to the preset writing angle. I.e., the second gauge disk 96 is used to gauge whether the pen nib is tilted at the preset writing angle relative to the paper 200. The preset writing angle is an acute angle, and preferably, the preset writing angle is larger than 30 degrees and smaller than 90 degrees.
The pen nib pass through glue with installed part 95 bonds, or set up the draw-in groove on the pen nib set up the buckle on the installed part 95, be connected through the block of buckle and draw-in groove and will the pen nib is installed on the installed part 95. The mounting member 95 is inserted into the sleeve 91 from a lower end opening of the sleeve 91 and is reciprocally slidable along the sleeve 91; the stopper 93 is inserted into the threaded through hole and screwed, so that one end of the stopper 93 is inserted into the sleeve 91 and contacts the mounting member 95, and as the stopper 93 is inserted into the threaded through hole, the holding force of the stopper 93 against the mounting member 95 increases, thereby stopping the mounting member 95 in the sleeve 91.
Ink is dropped into the sleeve 91 from the upper end opening of the sleeve 91 and is transferred to the pen nib through the mounting member 95 so that the pen nib can write on the paper 200 after the drive means 5 is turned on.
As shown in fig. 5, the sheet carrying platform 4 includes: a moving table 41, a bottom plate 42 provided on the upper surface of the moving table 41, a placement table 43 provided on the upper surface of the bottom plate 42, and a first paper pressing plate 44 provided above the placement table 43 and connected to the placement table 43; the paper 200 is located between the placing table 43 and the first paper pressing plate 44 and can slide back and forth along the left and right directions; the first paper pressing plate 44 is provided with a plurality of hollow-outs 441 for exposing the paper 200.
The driving device 5 is connected with the moving table 41 to drive the moving table 41 to reciprocate, and the bottom plate 42 is used for fixing the object placing table 43 and the paper pre-tightening device 10; the first paper pressing plate 44, the placing table 43 and the bottom plate 42 are sequentially arranged on the moving table 41 from top to bottom; the moving table 41 drives the paper 200 to reciprocate through the bottom plate 42 and the placement table 43, thereby generating friction with the writing instrument 2. The first paper pressing plate 44 is used for pressing and spreading the paper 200, so as to avoid the phenomenon that the paper 200 is curled under the action of friction force between the paper 200 and the writing tool 2 when the moving table 41 moves, so that the test effect is influenced, and the test data is not aligned.
Furthermore, as the first paper pressing plate 44 is provided with a plurality of hollow-outs 441, the area of the first paper pressing plate 44 without the hollow-outs 441 is smaller, and is not easily connected to the platform 43 and the bottom plate 42, and when the screw is inserted through the first paper pressing plate 44, under the action of friction between the pen nib and the paper 200, the screw is easily caused to communicate with the hollow parts 441 near the two sides of the screw, the first paper pressing plate 44 shakes, further causing the paper 200 to be fixed unstably, in order to solve the problem, the first paper pressing plate 44 of the present invention is further provided with a second paper pressing plate 45, the center of the second paper pressing plate 45 is hollowed to expose the hollow part 441, and four screws are used for sequentially penetrating through four corners of the second paper pressing plate 45, the first paper pressing plate 44 and the object placing table 43 from top to bottom and then are in threaded connection with the bottom plate 42, so that the first paper pressing plate 44 is stably installed.
As shown in fig. 1, the driving device 5 includes a controller 51 and a linear motor 52, the computer 100, the controller 51, the linear motor 52 and the motion stage 41 are sequentially connected, and a reciprocating direction of the motion stage 41 is perpendicular to the cantilever beam 7. The computer 100 controls the motion parameters of the motion table 41 such as the motion mode (e.g., left and right), the motion speed, the motion displacement, the motion acceleration, the motion pause time, etc. through the controller 51, and can simulate various writing states and writing speeds by setting different motion parameters, so that the worker can more comprehensively know the writing hand feeling of the writing tool 2 in the test process.
As shown in fig. 2, the strain gauge assembly 8 includes: the first strain gauge 81 and the second strain gauge are symmetrically arranged on the upper surface and the lower surface of the cantilever beam 7; after the triaxial displacement table 31 adjusts the position of the cantilever beam 7 to enable the writing tool 2 to contact with the paper 200, the triaxial displacement table 31 drives the cantilever beam 7 downward, so that the pressure of the writing tool 2 on the paper 200 is increased, that is, the load borne by the paper 200 is increased, the cantilever beam 7 deforms (first deformation), the first deformation of the cantilever beam 7 is measured through the first strain gauge 81 and the second strain gauge, so as to obtain the load information applied by the writing tool 2 on the paper 200, the load when the writing tool 2 writes can be realized through the height adjustment of the cantilever beam 7 by the triaxial displacement table 31, the higher the cantilever beam 7 is, the smaller the deformation of the cantilever beam 7 is, and the load generated by the writing tool 2 on the paper 200 is smaller; the lower the cantilever beam 7, the greater the deformation of the cantilever beam 7, and the greater the load that the writing instrument 2 generates on the paper 200.
The strain gauge assembly further comprises a third strain gauge 82 and a fourth strain gauge, the third strain gauge 82 and the fourth strain gauge are symmetrically arranged on the right side and the left side of the cantilever beam 7, and a central connecting line of the third strain gauge 82 and the fourth strain gauge is parallel to the movement direction of the movement table 41; the third strain gauge 82 and the fourth strain gauge are used to obtain friction force information. When the paper 200 reciprocates left and right, a friction force is generated between the writing tool 2 and the paper 200, and the cantilever beam 7 generates a second deformation under the action of the friction force; the third strain gauge 82 and the fourth strain gauge are used for measuring the friction force information generated between the writing tool 2 and the paper 200 according to a second deformation quantity when the paper slides back and forth to cause the cantilever beam 7 to generate a second deformation.
The paper pre-tightening device 10 comprises a first paper winding mechanism 101 and a second paper winding mechanism 102 which are symmetrically arranged on two sides of the bottom plate 42, two ends of the paper 200 are respectively connected with the first paper winding mechanism 101 and the second paper winding mechanism 102, and the rotation directions of the first paper winding mechanism 101 and the second paper winding mechanism 102 are opposite. Preferably, the linear motor 52 drives the moving table 41 to reciprocate in the left-right direction, the first winding mechanism 101 and the second winding mechanism 102 are respectively located on the right side and the left side of the bottom plate 42, and the three-axis displacement table 31 is located on the rear side of the moving table 41.
As shown in fig. 6 to 9, the first winding mechanism 101 includes: the paper winding machine comprises a bracket 103, a first circular ring 104 and a second circular ring 105 which are symmetrically arranged, a hollow column 106, a rotating shaft 107 and a paper winding drum 108; the bracket 103 is in screw connection with the bottom plate 42, the length direction of the bracket 103 is perpendicular to the movement direction of the bottom plate 42, and the second ring 105 and the first ring 104 are symmetrically arranged at the front end and the rear end of the bracket 103; one end of the hollow column 106 is inserted into the first circular ring 104, and the other end is provided with an opening and faces the second circular ring 105; a first end of the rotating shaft 107 (i.e. the rear end of the rotating shaft 107) is inserted into the hollow column 106 from the opening and can slide back and forth along the hollow column 106, and a second end of the rotating shaft 107 (i.e. the front end of the rotating shaft 107) passes through the second circular ring 105; the rotating shaft 107 can slide back and forth along the length direction of the support 103 relative to the hollow column 106, and meanwhile, the rotating shaft 107 can also rotate in the hollow column 106; a first end of the rotating shaft 107 is connected with the hollow column 106 through an elastic member 109, and a deformation direction of the elastic member 109 is parallel to a sliding direction of the rotating shaft 107; a plurality of tooth sockets 110 are arranged on the inner wall of the second ring 105, and a plurality of tooth tips 111 meshed with the tooth sockets 110 are arranged on the outer wall of the rotating shaft 107; the paper winding drum 108 is sleeved on the hollow column 106; and a clamping groove meshed with the tooth tip 111 is arranged on the inner wall of the paper winding cylinder 108.
The roll paper tube 108 and the rotary shaft 107 are connected by the engagement between the tooth tip 111 and the catch, and when the tooth tip 111 engages with the catch, the roll paper tube 108 can still slide back and forth with respect to the rotary shaft 107, that is, the tooth tip 111 can slide back and forth with respect to the tooth groove 110, but the roll paper tube 108 cannot rotate with respect to the rotary shaft 107. The second end of the rotating shaft 107 passes through the second ring 105, so that the tooth tips 111 are engaged with the tooth grooves 110 to limit the rotation of the rotating shaft 107, and further limit the non-rotation of the paper winding drum 108, and at this time, the extensibility of the paper 200 is limited, and the paper cannot be tensioned or loosened. Since the first end of the rotating shaft 107 is connected to the hollow column 106 through the elastic member 109, and the second end of the rotating shaft 107 is pressed from the front to the back, so that the rotating shaft 107 can be pushed to slide into the hollow column 106, the elastic member 109 is compressed, when the tooth tip 111 moves between the first circular ring 104 and the second circular ring 105 and is separated from the tooth socket 110, the rotating shaft 107 can rotate under the external force to drive the paper winding drum 108 to rotate, at this time, the rotating shaft 107 can be rotated clockwise (viewed from the back to the front) to make the front end of the paper 200 far away from the bottom plate 42 so as to pre-tension the paper 200, and the rotating shaft 107 can be rotated counterclockwise (viewed from the back to the front) to make the right end of the paper 200 close to the bottom plate 42 so as to loosen the paper 200.
Furthermore, a plurality of slots 112 are formed in the hollow column 106 along the opening thereof and extend towards the rear end thereof, the slots 112 are communicated with the central hole of the hollow column 106, and the length of the slots 112 is smaller than that of the hollow column 106; the rotating shaft 107 is provided with a plurality of protrusions 113, the protrusions 113 are engaged with the slots 112, and when the rotating shaft 107 slides back and forth relative to the hollow shaft, the protrusions 113 slide back and forth along the slots 112 and provide guidance for the back and forth sliding of the rotating shaft 107.
The second winding mechanism 102 is in the same principle as the first winding mechanism 101, and when the paper sheet 200 pre-tensioning device is used, the first winding mechanism 101 and/or the second winding mechanism 102 can be started to adjust the tension and the slack of the paper sheet 200 as required.
In a preferred embodiment, as shown in fig. 10, when viewed from the back to the front, the tooth space 110 is a right-angled tooth space, the tooth tip 111 is a right-angled tooth tip, and when the right-angled tooth space is engaged with the right-angled tooth tip, the rotating shaft 107 can rotate clockwise relative to the second ring 105, and drive the paper winding drum 108 to rotate clockwise, so that the paper 200 slides and tensions in a direction away from the object placing table 43 in the right direction, and the rotating shaft 107 cannot rotate counterclockwise. When a test experiment is carried out, the first paper winding mechanism 101 is adjusted to rotate the rotating shaft 107 clockwise from back to front so as to tension the paper 200; after the test experiment is finished, the rotating shaft 107 is pressed from front to back, so that the tooth tips 111 are separated from the tooth grooves 110, the rotating shaft 107 is rotated anticlockwise, the paper winding drum 108 is rotated anticlockwise, the right end of the paper 200 moves towards the direction close to the object placing table 43, the paper 200 is loosened, and the pre-tightening force is relieved. After the pressing is stopped, the rotating shaft 107 returns to the original position under the action of the elastic member 109 restoring the elastic deformation, and is engaged with the tooth groove 110 again.
As shown in fig. 1, the data acquisition device 6 includes a bridge box 61, a signal amplifier 62 and a data acquisition card 63 connected in sequence; the bridge box 61 is connected with the strain gauge assembly 8; the data acquisition card 63 is connected to the computer 100.
The invention also provides a testing method based on the writing tool friction force testing device, which comprises the following steps: s100, respectively clamping and fixing the writing tool 2 and the paper 200;
taking the writing tool 2 as a pen point as an example, the step S100 is specifically as follows:
after the pen nib is connected to the lower end of the mounting member 95, the upper end of the mounting member 95 is inserted into the sleeve 91 from the lower end opening of the sleeve 91, and the pen nib is positioned outside the sleeve 91; insert the locating part 93 the screw thread through-hole and screw up, make the locating part 93 tightly hold in the top the installed part 95 to reach and use certain dynamics to outwards extract when the staff the installed part 95 makes and can't extract, with the installation of firm pen nib, avoid pen nib with when the friction between the paper 200 the installed part 95 produces the displacement and influences test data under the frictional force effect.
The mounting of the writing instrument 2 on the cantilever beam 7 is completed by inserting the connecting column 92 into the mounting hole at the bottom of the front end of the cantilever beam 7 and bringing the upper surface of the second dial 96 into full contact fit with the lower surface of the cantilever beam 7.
The moving table 41 is connected with the linear motor 52, the object placing table 43 and the bottom plate 42 are sequentially placed on the moving table 41 from top to bottom, the first paper pressing plate 44 and the second paper pressing plate 45 are sequentially placed on the paper 200 after the paper 200 is placed on the object placing table 43, and the second paper pressing plate 45, the first paper pressing plate 44, the object placing table 43 and the bottom plate 42 are fixedly connected through screws. The front end of the paper 200 is connected to the winding cylinder 108 of the first winding mechanism 101, and the rear end of the paper 200 is connected to the winding cylinder 108 of the second winding mechanism 102.
S200, adjusting the position and the load of the writing tool 2 through the displacement adjusting device 3;
the step S200 specifically includes the steps of:
s201, adjusting the position of a pen point through the three-axis displacement table 31, so that the pen point moves to a position right above the paper 200 and passes through the hollow 441 to be in contact with the paper 200;
s202, controlling the cantilever beam 7 to move downwards through the triaxial displacement table 31, increasing the load between the pen nib and the paper 200, and enabling the cantilever beam 7 to deform.
S300, starting a driving device 5, further deforming the cantilever beam under the action of friction force between the writing tool 2 and the paper 200, acquiring load information and friction force information by the strain gauge assembly 8, analyzing and recording the load information and the friction force information by using a data acquisition device 6 connected with the strain gauge assembly 8, and calculating and acquiring a friction coefficient by using a computer 100 connected with the data acquisition device 6. Under the condition that the pen nib is guaranteed to be in complete contact with the paper 200, the linear motor 52 is started to drive the motion table 41 to reciprocate left and right, sliding friction force is generated between the pen nib and the paper 200, the cantilever beam 7 is further caused to deform, the first strain gauge 81, the second strain gauge, the third strain gauge 82 and the fourth strain gauge collect load information and friction force information, the data acquisition device 6 analyzes and records the load information and the friction force information and acquires corresponding load data and friction force data, and the computer 100 calculates and acquires corresponding friction coefficients according to the load data and the friction force data.
In summary, the invention provides a friction force testing device and a friction force testing method for a writing tool, the writing tool can be installed through the clamping device, and the writing tool is positioned, so that the writing tool is inclined at a preset writing angle relative to the paper, the state of the writing tool held by a hand when the writing tool is written on the paper is simulated, and the writing hand feeling of the writing tool is judged by acquiring the friction coefficient through acquiring the load and the friction force between the writing tool and the paper.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (7)
1. The utility model provides a writing instrument frictional force testing arrangement, its includes base and writing instrument, its characterized in that, be provided with displacement adjusting device, paper load-bearing platform, drive arrangement, data acquisition device and computer on the base, be provided with the cantilever beam on the displacement adjusting device, be provided with the foil assembly on the cantilever beam, cantilever beam front end bottom is provided with clamping device, be provided with paper on the paper load-bearing platform and with the paper preloading device that the paper is connected and is stretched paper, clamping device is used for the centre gripping location writing instrument, and makes writing instrument becomes the slope of preset writing angle for the paper, drive arrangement with paper load-bearing platform is connected and is driven paper load-bearing platform reciprocating motion, drive arrangement still with the computer is connected, the foil assembly, The data acquisition device and the computer are sequentially connected;
the paper load-bearing platform includes: the paper pressing device comprises a moving table, a bottom plate arranged on the upper surface of the moving table, an object placing table arranged on the upper surface of the bottom plate, and a first paper pressing plate arranged above the object placing table and connected with the object placing table; the paper is positioned between the object placing table and the first paper pressing plate and can slide in a reciprocating manner; the first paper pressing plate is provided with a plurality of hollows for exposing the paper;
the paper pre-tightening device comprises a first paper rolling mechanism and a second paper rolling mechanism which are symmetrically arranged on two sides of the bottom plate, two ends of the paper are respectively connected with the first paper rolling mechanism and the second paper rolling mechanism, and the first paper rolling mechanism and the second paper rolling mechanism roll two ends of the paper in a direction away from the bottom plate; the first winding mechanism includes: the winding device comprises a bracket, a first circular ring, a second circular ring, a hollow column, a rotating shaft and a paper winding drum, wherein the first circular ring and the second circular ring are symmetrically arranged; one end of the hollow column is inserted into the first circular ring, and the other end of the hollow column is provided with an opening and faces the second circular ring; the first end of the rotating shaft is inserted into the hollow column from the opening and can slide along the hollow column in a reciprocating mode, and the second end of the rotating shaft penetrates through the second circular ring; the first end of the rotating shaft is connected with the hollow column through an elastic piece, and the deformation direction of the elastic piece is parallel to the sliding direction of the rotating shaft; a plurality of tooth sockets are arranged on the inner wall of the second ring, and a plurality of tooth tips meshed with the tooth sockets are arranged on the outer wall of the rotating shaft; the paper winding drum is sleeved on the hollow column; and a clamping groove meshed with the tooth tip is formed in the inner wall of the paper winding tube.
2. The writing instrument friction force testing device of claim 1, wherein the clamping device comprises: the device comprises a sleeve, a connecting column and a plurality of limiting parts; the upper end and the lower end of the sleeve are both opened; the connecting column is fixedly arranged on the outer surface of the sleeve and is vertically connected with the cantilever beam; the sleeve is provided with a plurality of threaded through holes, the limiting part is provided with external threads, and the external threads are matched with the threaded through holes so that one end of the limiting part is arranged in the sleeve.
3. The writing instrument friction test device of claim 2 wherein said writing instrument is a cartridge, said cartridge passes through said sleeve, and said retainer abuts said cartridge.
4. The device for testing friction force of a writing tool according to claim 2, wherein the writing tool is a pen nib, a mounting member is arranged in the lower opening of the sleeve, one end of the mounting member is arranged outside the sleeve and connected with the pen nib, the mounting member is used for transferring ink injected from the upper opening of the sleeve to the pen nib, and the limiting member supports against the mounting member.
5. The writing instrument friction force testing device of claim 1, wherein the strain gauge assembly comprises a first strain gauge and a second strain gauge symmetrically arranged on the upper surface and the lower surface of the cantilever beam; the first strain gauge and the second strain gauge are used for measuring load information borne by the paper according to the deformation amount of the cantilever beam when the displacement adjusting device adjusts the load of the writing tool on the paper by adjusting the height of the cantilever beam.
6. The writing instrument friction force testing device according to claim 1, wherein the data acquisition device comprises a bridge box, a signal amplifier and a data acquisition card which are connected in sequence; the bridge box is connected with the strain gauge component; the data acquisition card is connected with the computer.
7. A test method based on the device for testing friction force of a writing instrument according to any one of claims 1 to 6, comprising the steps of:
respectively clamping and fixing the writing tool and the paper;
the position adjustment and the load adjustment are carried out on the writing tool through the displacement adjusting device;
and starting a driving device, acquiring load information and friction force information by the strain sheet assembly, analyzing and recording the load information and the friction force information by using a data acquisition device connected with the strain sheet assembly, and calculating and acquiring a friction coefficient by using a computer connected with the data acquisition device.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810385641.1A CN108872064B (en) | 2018-04-26 | 2018-04-26 | Writing tool friction force testing device and testing method thereof |
| PCT/CN2018/097904 WO2019205331A1 (en) | 2018-04-26 | 2018-08-01 | Writing implement friction testing apparatus and testing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810385641.1A CN108872064B (en) | 2018-04-26 | 2018-04-26 | Writing tool friction force testing device and testing method thereof |
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| CN108872064A CN108872064A (en) | 2018-11-23 |
| CN108872064B true CN108872064B (en) | 2021-01-12 |
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| CN201810385641.1A Active CN108872064B (en) | 2018-04-26 | 2018-04-26 | Writing tool friction force testing device and testing method thereof |
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| WO (1) | WO2019205331A1 (en) |
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| CN109540783A (en) * | 2019-01-08 | 2019-03-29 | 深圳大学总医院 | A kind of arch wire bracket confficient of static friction measuring device |
| CN110186795A (en) * | 2019-05-30 | 2019-08-30 | 深圳大学 | A kind of side's arch wire and bracket rubbing device and test method |
| CN110186797A (en) * | 2019-05-30 | 2019-08-30 | 深圳大学 | A kind of mouth cavity orthodontic correction side arch wire frictional wear experimental device and its experimental method |
| CN110186796A (en) * | 2019-05-30 | 2019-08-30 | 深圳大学 | A kind of orthodontic utility arch bracket frictional wear experimental device and test method |
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| WO2019205331A1 (en) | 2019-10-31 |
| CN108872064A (en) | 2018-11-23 |
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