CN214237826U - Device for measuring sliding friction coefficient between two objects - Google Patents
Device for measuring sliding friction coefficient between two objects Download PDFInfo
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- CN214237826U CN214237826U CN202022971912.7U CN202022971912U CN214237826U CN 214237826 U CN214237826 U CN 214237826U CN 202022971912 U CN202022971912 U CN 202022971912U CN 214237826 U CN214237826 U CN 214237826U
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Abstract
The utility model discloses a measuring device for the sliding friction coefficient between two objects, which comprises a frame, wherein a second testing piece positioning mechanism and a first testing piece positioning mechanism are arranged on the frame, the first testing piece positioning mechanism and the second testing piece positioning mechanism are both arranged on a working platform of the frame, and the first testing piece positioning mechanism drives an ice skate blade or an artificial ice experimental block to horizontally and downwardly move to be close to a plastic artificial ice disc on the second testing piece positioning mechanism; the device is characterized by further comprising a pressure sensor, wherein the pressure sensor is connected to a guide shaft fixing plate of the testing piece-positioning mechanism through a pressure sensor fixing seat, and the working end of the pressure sensor is in contact with an ice skate fixing seat on the testing piece-positioning mechanism. The utility model discloses think about ingenious, overall arrangement is compact reasonable, through the design of testing two positioning mechanism of piece and testing a positioning mechanism, realizes the measurement of coefficient of sliding friction between skates and plastics emulation ice disc, emulation ice experiment piece and the carousel, realizes automatic operation, convenient and fast through the controller.
Description
Technical Field
The utility model relates to a coefficient of friction measures technical field, especially relates to a measuring device of coefficient of sliding friction between two kinds of objects.
Background
The ice surface can be scratched by the movement on the ice, the requirement on the use environment of the real ice is high, and in order to maintain the flatness of the ice surface and ensure normal use, a large amount of manpower and material resources are required to be invested to maintain the ice surface. With the continuous research and development of new materials, various ice simulation materials are gradually applied to ice simulation yards, but the ice simulation materials made of different materials have different characteristics. How to develop a detection device to detect whether the simulated ice material of different materials meets the use standard becomes a technical problem to be solved urgently by technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a measuring device of coefficient of sliding friction between two kinds of objects through the design and the installation of two positioning mechanism of test piece and a positioning mechanism of test piece, realizes the measurement of coefficient of friction under two kinds of modes between skates and plastics emulation ice disc, emulation ice experiment piece and the carousel.
In order to solve the technical problem, the utility model adopts the following technical scheme:
the utility model relates to a measuring device for the sliding friction coefficient between two objects, which comprises a frame for supporting and moving, wherein a testing piece two-positioning mechanism and a testing piece one-positioning mechanism are arranged on the frame, the testing piece one-positioning mechanism is installed on the frame through a fixed seat, the testing piece two-positioning mechanism is installed on a working platform of the frame, and the testing piece one-positioning mechanism drives an ice skate blade or an artificial ice experimental block to move downwards to be close to a plastic artificial ice disc on the testing piece two-positioning mechanism; the device also comprises a pressure sensor, wherein the pressure sensor is connected to a guide shaft fixing plate of the testing piece-positioning mechanism through a pressure sensor fixing seat, and the working end of the pressure sensor is in contact with an ice skate fixing seat on the testing piece-positioning mechanism;
when the plastic simulation ice disk rotates, the plastic simulation ice disk is contacted with the ice skate blade or the simulation ice experiment block, and the sliding friction coefficient of the plastic simulation ice disk and the simulation ice experiment block is measured through the pressure sensor.
Furthermore, the two positioning mechanisms of the test piece comprise a rotary driving device, a coupler, a turntable and a plastic simulation ice disc, the output end of the rotary driving device is in transmission connection with the coupler, the coupler penetrates through the mounting holes of the two positioning mechanisms of the test piece on the working platform and is connected with the turntable, the plastic simulation ice disc is detachably mounted on the top surface of the turntable, and the top end of the coupler is locked by a pressing cap.
Furthermore, the section of the coupler is of a T-shaped structure and comprises a small-diameter shaft at the top and a large-diameter shaft at the bottom, the periphery of the small-diameter shaft is provided with threads, the pressing cap is connected to the top through the threads, and the plastic simulation ice disc is sleeved on the small-diameter shaft and is in clearance fit with the small-diameter shaft; the large-diameter shaft is positioned in the mounting hole of the second positioning mechanism of the test piece, the bottom end of the large-diameter shaft is embedded into the rotary driving device, and the large-diameter shaft is connected with the rotary driving device through a screw and a pin; the turntable is sleeved on the small-diameter shaft and connected to the large-diameter shaft through a bolt.
Still further, the rotary driving device comprises a servo motor and a speed reducer which are connected together, the servo motor and the speed reducer are connected together through bolts, the speed reducer is connected to the working platform through bolts and pins, and the speed reducer is connected with the bottom of the coupler through bolts.
Still further, the first testing piece positioning mechanism comprises a vertical movement assembly and an ice skate blade or a simulation ice experiment block, the vertical movement assembly is installed on a fixed seat, the ice skate blade or the simulation ice experiment block is installed at the working end of the vertical movement assembly, and the fixed seat is directly installed on a working platform of the rack.
Furthermore, the vertical movement assembly comprises an electric push rod, a guide shaft fixing plate, a linear optical axis and an installation assembly for fixing the ice skate blade or the ice cube, the top of the electric push rod is installed on a flat plate protruding from the top of the fixing seat through an electric push rod connecting plate, the bottom of the electric push rod is connected with the guide shaft fixing plate through a connecting plate, the linear optical axis is connected onto the guide shaft fixing plate through an upper box-type bearing seat and a lower box-type bearing seat, a fixed balancing weight is arranged in the middle of the linear optical axis, the bottom end of the linear optical axis is connected with the ice skate blade or the simulated ice experiment block through the installation assembly, and a weight is placed on the fixed balancing weight during working; the electric push rod moves in a telescopic mode to drive the guide shaft fixing plate to vertically move up and down through the connecting plate, and the linear optical axis and the ice skate or the simulated ice experiment block at the bottom generate sliding friction in different stress states under the action of positive pressure generated by different numbers of weights when the ice skate or the simulated ice experiment block is in rotary contact with the plastic simulated ice disc or the rotary disc.
Furthermore, the electric push rod connecting plate is arranged on a flat plate protruding from the top of the fixed seat through a bolt; the middle part of guide shaft fixed plate is installed with laser range finder, laser range finder with fixed balancing weight is corresponding, pressure sensor fixing base passes through bolted connection on the working face of guide shaft fixed plate.
Still further, the connecting plate comprises a first connecting plate and a second connecting plate which are arranged side by side, the guide shaft fixing plate is fixed on the front surfaces of the first connecting plate and the second connecting plate through bolts, and guide mechanisms are arranged between the bottom surfaces of the first connecting plate and the second connecting plate and the fixed seat; the guide mechanism comprises a linear slide rail arranged on the fixed seat, and the bottom surfaces of the first connecting plate and the second connecting plate are in sliding connection with the linear slide rail and vertically move up and down along the linear slide rail.
Still further, the installation component comprises a guide shaft connecting plate, an ice skate fixing seat and a sliding group, the guide shaft connecting plate is connected to the bottom end of the linear optical axis, the sliding group is arranged between the ice skate fixing seat and the guide shaft connecting plate, and the ice skate or the simulated ice experimental block is installed on the ice skate fixing seat.
Still further, the test piece positioning mechanism comprises a horizontal movement component, the fixing seat is installed on the horizontal movement component, and the horizontal movement component is installed in an installation groove of the working platform; the horizontal motion subassembly includes horizontal slip table keysets, horizontal slip table and step motor, the horizontal slip table passes through the horizontal slip table keysets is installed in test piece positioning mechanism mounting groove, step motor's work end passes through the shaft coupling and is connected with the one end of lead screw, the other end of lead screw is rotatable to be installed on the horizontal slip table, threaded connection has on the horizontal migration seat on the lead screw, the bottom of fixing base with the horizontal migration seat is connected, and follow under step motor's the drive lead screw horizontal migration.
Compared with the prior art, the utility model discloses a beneficial technological effect:
the utility model relates to a measuring device for the sliding friction coefficient between two objects, which comprises a frame, wherein a second testing piece positioning mechanism and a first testing piece positioning mechanism are arranged on the frame, the first testing piece positioning mechanism is arranged on the frame through a fixed seat, the second testing piece positioning mechanism is arranged on a working platform of the frame, and the first testing piece positioning mechanism drives an ice skate blade or an artificial ice experimental block to horizontally and downwards move to be close to a plastic artificial ice disc on the second testing piece positioning mechanism; the pressure sensor is connected to the fixed seat through the pressure sensor fixed seat, and the working end of the pressure sensor is in contact with the force application part; when the plastic simulation ice disk or the turntable rotates, the plastic simulation ice disk or the turntable is contacted with the ice skate blade or the simulation ice experiment block, and the sliding friction coefficient of the plastic simulation ice disk or the turntable and the simulation ice experiment block is measured through the pressure sensor. The utility model discloses it is specific to realize two kinds of mode, and first mode is for measuring the coefficient of sliding friction between skates and the plastics emulation ice disc, and second mode is for measuring the coefficient of sliding friction between emulation ice experiment piece and the carousel. The utility model discloses think about ingenious, the overall arrangement is compact reasonable, through the design reason of two positioning mechanism of test piece and a positioning mechanism of test piece, realize the measurement of coefficient of friction between skates and plastics emulation ice disc, emulation ice experiment piece and the carousel, wherein, two positioning mechanism of test piece realize the drive of carousel, plastics emulation ice disc rotation operation, and a positioning mechanism of test piece realizes height and horizontal position's regulation, realizes automatic operation, convenient and fast through the controller.
Drawings
The present invention will be further explained with reference to the following description of the drawings.
FIG. 1 is a schematic view of a device for measuring the coefficient of sliding friction between two objects according to the present invention;
FIG. 2 is a schematic view of the frame structure of the present invention;
FIG. 3 is a schematic view of a positioning mechanism of the test piece of the present invention;
FIG. 4 is a side view of a positioning mechanism of the test piece of the present invention;
FIG. 5 is a schematic view of a second positioning mechanism of the test piece of the present invention;
description of reference numerals: 1. a frame; 2. a second test piece positioning mechanism; 3. a positioning mechanism for the test piece; 4. a weight box; 5. ground feet; 6. a weight; 101. a second positioning mechanism mounting hole of the test piece; 102. a test piece positioning mechanism mounting groove;
201. a servo motor; 202. a speed reducer; 203. a coupling; 204. a turntable; 205. a plastic simulation ice disc; 206. a compression cap;
301. a horizontal sliding table adapter plate; 302. a horizontal sliding table; 303. a stepping motor; 304. a fixed seat; 305. The electric push rod connecting plate; 306. an electric push rod; 307-1, a first connecting plate; 307-2, a second connecting plate; 308. a guide shaft fixing plate; 309. a linear optical axis; 310. a box-type bearing seat; 311. fixing a balancing weight; 312. a linear slide rail; 313. a guide shaft connecting plate; 314. a sliding group; 315. a skate blade fixing seat; 316-1, ice skate; 316-2, simulation ice experiment block; 317. a laser range finder; 318. a pressure sensor holder; 319. a pressure sensor.
Detailed Description
As shown in fig. 1 to 5, a device for measuring a sliding friction coefficient between two objects comprises a frame 1 for supporting and moving, wherein a second test piece positioning mechanism 2 and a first test piece positioning mechanism 3 are arranged on the frame 1, the first test piece positioning mechanism 3 is mounted on the frame 1 through a fixing seat 304, the second test piece positioning mechanism 2 is mounted on a working platform of the frame 1, and the first test piece positioning mechanism 3 drives an ice skate blade 306-1 or an artificial ice experimental block 306-2 to horizontally and downwardly move to be close to a plastic artificial ice disc 205 on the second test piece positioning mechanism 2; specifically, the device further comprises a pressure sensor 319, the pressure sensor 319 is connected to the guide shaft fixing plate 308 of the first testing piece positioning mechanism 3 through a pressure sensor fixing seat 318, and a working end of the pressure sensor 319 is in contact with an ice skate fixing seat 315 on the first testing piece positioning mechanism 3; in operation, the plastic ice simulating disc 205 rotates to contact the ice blade 306-1 or the ice simulating test block 306-2 and the sliding friction coefficient of the ice blade and the ice simulating test block is measured by the pressure sensor 319. The testing device comprises a testing piece two-positioning mechanism 2 and a testing piece one-positioning mechanism 3, and is characterized by further comprising a controller, wherein driving devices on the testing piece two-positioning mechanism and the testing piece one-positioning mechanism 3 are electrically connected with the controller so as to realize automatic control. Meanwhile, the laser range finder 317 and the pressure sensor 319 are also electrically connected with the controller, the detected data technology is transmitted to the PLC control center, and corresponding sliding friction coefficients under different conditions are checked according to a set calculation formula.
As shown in fig. 2, the frame 1 includes the section bar frame and the work platform that link together, one corner on the work platform is provided with weight box 4, a plurality of reserve weights 6 have been placed in the weight box 4, on the work platform with the position that two positioning mechanism 2 of test piece correspond is provided with two positioning mechanism mounting holes 101 of test piece, on the work platform with the position that a positioning mechanism 3 of test piece corresponds is provided with a square positioning mechanism mounting groove 102 of test piece, the bottom four corners of section bar frame is provided with lower margin 5, install the universal wheel on the lower margin 5. The weight box 4 is provided with a corresponding positioning rod matched with the weight 6 according to the specific structure of the fixed balancing weight 311.
As shown in fig. 5, the second positioning mechanism 2 of the test piece comprises a rotary driving device, a coupler 203, a turntable 204 and a plastic simulation ice disk 205, the output end of the rotary driving device is in transmission connection with the coupler 203, the coupler 203 penetrates through the mounting hole 101 of the second positioning mechanism of the test piece on the working platform and is connected with the turntable 204, the plastic simulation ice disk 205 is detachably mounted on the top surface of the turntable 204, and the top end of the coupler 203 is locked by a pressing cap 206 to the plastic simulation ice disk 205.
Specifically, the section of the coupling 203 is a T-shaped structure and comprises a small-diameter shaft at the top and a large-diameter shaft at the bottom, the periphery of the small-diameter shaft is provided with threads, the compression cap 206 is connected to the top through the threads, and the plastic simulation ice disc 205 is sleeved on the small-diameter shaft and is in clearance fit with the small-diameter shaft; the large-diameter shaft is positioned in the mounting hole 101 of the second positioning mechanism of the test piece, the bottom end of the large-diameter shaft is embedded into the rotary driving device, and the large-diameter shaft is connected with the rotary driving device through a screw and a pin; the turntable 204 is sleeved on the small-diameter shaft and connected to the large-diameter shaft through a bolt. The rotary driving device comprises a servo motor 201 and a speed reducer 202 which are connected together, the servo motor 201 and the speed reducer 202 are connected together through bolts, the speed reducer 202 is connected to the working platform through bolts and pins, and the speed reducer 202 and the bottom of a coupler 203 are connected together through bolts. During operation, the servo motor 201 is started to drive the coupler 203 to rotate at a high speed through the speed reducer 202, and the turntable 204 connected to the coupler drives the plastic simulation ice disc 205 to rotate synchronously.
As shown in fig. 3 and 4, the first test piece positioning mechanism 3 includes a vertical moving component and an ice blade 316-1 or a simulated ice experiment block 316-2, the vertical moving component is mounted on a fixed seat 304, the fixed seat 304 is mounted on a workbench of the rack, and the ice blade 316-1 or the simulated ice experiment block 316-2 is mounted at a working end of the vertical moving component.
Specifically, the vertical motion assembly comprises an electric push rod 306, a guide shaft fixing plate 308, a linear optical axis 309 and an installation assembly for fixing an ice skate blade or an ice cube, the top of the electric push rod 306 is installed on a flat plate protruding from the top of the fixing seat 4 through an electric push rod connecting plate 305, the bottom of the electric push rod 306 is connected with the guide shaft fixing plate 308 through a connecting plate, the linear optical axis 309 is connected to the guide shaft fixing plate 308 through an upper box-type bearing seat and a lower box-type bearing seat 310, a fixed counterweight block 311 is arranged in the middle of the linear optical axis 309, the bottom end of the linear optical axis 309 is connected with the ice skate blade 316-1 or an artificial ice experiment block 316-2 through the installation assembly, and the counterweight 6 is placed on the fixed counterweight block 311 during operation; the electric push rod 306 is extended and retracted to drive the guide shaft fixing plate 308 to vertically move up and down through the connecting plate, the linear optical axis 309 and the ice skate 306-1 or the simulated ice experimental block 306-2 at the bottom are subjected to sliding friction in different stress states under positive pressure generated by different numbers of weights 6 when being in rotary contact with the plastic simulated ice disk 205 or the turntable 204, and corresponding sliding friction force is measured through the pressure sensor 319.
The electric push rod connecting plate 305 is installed on a flat plate protruding from the top of the fixed seat 4 through a bolt; the middle part of the guide shaft fixing plate 308 is provided with a laser range finder 317, the laser range finder 317 corresponds to the position of the fixed balancing weight 311, the pressure sensor fixing seat 318 is connected to the working surface of the guide shaft fixing plate 308 through a bolt, and the bolt connecting structure is convenient and quick to install and disassemble; the laser range finder 317 is arranged to limit the descending distance of the linear optical axis 309, so as to protect the plastic ice-simulating disk 205 and prevent the ice skate blade from sliding through the plastic ice-simulating disk 205. Specifically, in an unstressed state, the sensing height between the laser range finder 317 and the fixed counterweight block 311 is an initial position, and after the stress is reduced, the laser range finder 317 can sense the distance that the fixed counterweight block 311 moves downwards, and a safety value is set according to a program to perform safety monitoring; a limiting protection block may be further provided, the limiting protection block is connected to the guide shaft fixing plate 308 and located below the fixed weight 311, and protection for displacement when the plastic ice block or the ice skate blade descends is formed by blocking the fixed weight 311.
The connecting plates comprise a first connecting plate 307-1 and a second connecting plate 307-2 which are arranged side by side, the guide shaft fixing plate 308 is fixed on the front faces of the first connecting plate 307-1 and the second connecting plate 307-2 through bolts, a guide mechanism is arranged between the bottom faces of the first connecting plate 307-1 and the second connecting plate 307-2 and the fixing seat 304, the guide mechanism comprises a linear slide rail 312 which is installed on the fixing seat 304, and the bottom faces of the first connecting plate 307-1 and the second connecting plate 307-2 are connected with the linear slide rail 17 in a sliding manner and vertically move up and down along the linear slide rail 312. Specifically, the linear sliding rail 312 may also be configured as a T-shaped or dovetail groove structure, and the cross section of the sliding groove is configured as a corresponding shape.
The mounting assembly comprises a guide shaft connecting plate 313 and an ice skate fixing seat 315, the guide shaft connecting plate 313 is connected to the bottom end of the linear optical axis 309, a sliding set 314 is arranged between the ice skate fixing seat 315 and the guide shaft connecting plate 313, and the ice skate 316-1 or the simulated ice experimental block 316-2 is mounted on the ice skate fixing seat 315. Specifically, the sliding set 314 may adopt a cross roller linear guide sliding set, two or two sets of sliding rails which move relative to each other are respectively connected to the guide shaft connecting plate 313 and the ice skate fixing seat 315 through screws, when the ice skate 316-1 or the simulated ice experimental block 316-2 contacts with the plastic simulated ice disk 205 or the turntable 204 which rotates below to generate sliding friction, the ice skate fixing seat 315 is forced to drive the sliding rail connected with the ice skate fixing seat to horizontally move, the side wall of the ice skate fixing seat 315 contacts with the pressure sensor 319, and the pressure sensor 319 detects and transmits the generated lateral force, i.e., the sliding friction force, to the controller.
Specifically, the first testing piece positioning mechanism further comprises a horizontal movement assembly, the fixing seat 304 is mounted on the horizontal movement assembly, and the horizontal movement assembly is mounted in a mounting groove of the working platform; the horizontal motion assembly comprises a horizontal sliding table adapter plate 301, a horizontal sliding table 302 and a stepping motor 303, wherein the horizontal sliding table 302 is installed in the test piece-positioning mechanism installation groove 102 through the horizontal sliding table adapter plate 301, the working end of the stepping motor 303 is connected with one end of a lead screw through a coupler, the other end of the lead screw is rotatably installed on the horizontal sliding table 302, the lead screw is in threaded connection with a horizontal moving seat, the bottom of the fixed seat 304 is connected with the horizontal moving seat, and the lead screw is driven by the stepping motor 303 to horizontally move along the lead screw; a threaded hole is formed in the specific horizontal moving seat, and a lead screw connected with the stepping motor 303 is matched with the threaded hole to convert the rotary motion of the stepping motor 303 into horizontal linear motion. Specifically, the arrangement of the horizontal movement assembly can change the specific contact position of the first test piece (the ice skate blade and the simulated ice experimental block) and the second test piece (the plastic simulated ice disc and the turntable), so that the working range of the plastic simulated ice disc and the turntable is effectively enlarged.
In another embodiment, the horizontal motion assembly comprises a horizontal sliding table and an air cylinder, the horizontal sliding table is installed on the working platform through the adapter plate of the horizontal sliding table, the working end of the air cylinder is connected with one end of the fixing seat, a guide key is arranged between the bottom of the fixing seat and the horizontal sliding table, and the air cylinder drives the fixing seat to move horizontally along the guide key. The air cylinder for driving can be replaced by an oil cylinder or a linear electric cylinder so as to realize the horizontal linear movement of the horizontal sliding table.
The working process of the utility model is as follows:
firstly, the utility model discloses can divide into two kinds of mode, the sliding friction coefficient between first mode is for measuring skates 316-1 and plastics emulation ice disc 205, and the sliding friction coefficient between second mode is for measuring emulation ice experimental block 316-2 and carousel 204. Specifically, the servo motor 201, the stepping motor 303, the electric push rod 306, the laser range finder 317 and the pressure sensor 319 are all electrically connected with a controller of the device, so that automatic control is realized according to a set program, and meanwhile, measured data are recorded; the parameters required for setting the experimental test operation comprise: the testing device comprises a working diameter, a running speed, a running time and a counterweight, wherein the working diameter controls a first testing component on a vertical motion component to move horizontally through a horizontal motion component, a second testing component is far away from or close to a second testing component on a second testing component positioning mechanism 2, the running speed and the running time mainly control the rotating speed of a servo motor 201, and the counterweight is determined by the number of manually placed weights.
The first mode of operation, namely the operation of measuring the sliding friction coefficient between the ice blade 316-1 and the plastic simulation ice disk 205, is as follows:
firstly, after an ice skate 316-1 and a plastic simulation ice disc 205 are cleaned, oil stains on the surfaces of the ice skate and the plastic simulation ice disc of a test piece are carefully removed by acetone or ethanol, and the surfaces of the test piece are not directly contacted by hands after the ice skate and the plastic simulation ice disc are cleaned;
secondly, mounting the ice skate blade 316-1 and the plastic simulation ice disc 205: the working rod of the electric push rod 306 is contracted, the guide shaft fixing plate 308 is driven to integrally ascend along the linear slide rail 312 through the first connecting plate 307-1 and the second connecting plate 307-2, so that the linear optical axis 309, the guide shaft connecting plate 313, the sliding group 314 and the ice skate fixing seat 315 integrally ascend, and after a certain height is reached, the ice skate 316-1 is fixed on the ice skate fixing seat 315; meanwhile, the plastic simulation ice disc 205 is fixed on the turntable 204 through bolts, and the pressing cap 206 is screwed down, so that the firmness and the flatness of the installation of the plastic simulation ice disc 205 are ensured.
Thirdly, the ice blade 316-1 contacts the plastic simulation ice disk 205: the working rod of the electric push rod 306 extends out to drive the guide shaft fixing plate 308 to descend along the linear slide rail 312, the guide shaft fixing plate 308, the ice skate fixing seat 315 and the ice skate 316-1 which are connected in front are driven to descend through the connecting plate 307-1 and the second connecting plate 307-2, when the tip of the ice skate is in contact with the upper surface of the plastic simulation ice disc, the electric push rod 306 stops descending, and positive pressure does not exist between the tip of the ice skate and the upper surface of the plastic simulation ice disc.
Step four, loading positive pressure and measuring sliding friction force: a positive pressure loading piece, namely a weight with set weight is placed on the fixed balancing weight 311, at the moment, the linear optical axis 309 freely slides downwards under the influence of positive pressure to drive the ice skate to apply force to the surface of the plastic simulation ice disc, and the positive pressure loading piece applied in the process is recorded to obtain the data of the positive pressure; then, the servo motor 201 starts to rotate clockwise, the plastic simulation ice disc 205 gives a tangential friction force in a clockwise direction to the ice skate 316-1, the friction force is transmitted to the pressure sensor 319 through the sliding group 314 without loss, and when the rotation speed is stable for a certain time of operation, the measured sliding friction force between the ice skate 316-1 and the plastic simulation ice disc 205 is transmitted to the controller; according to the set time, the servomotor 201 stops rotating.
Fifthly, disassembling the test piece after the measurement is finished: firstly, the weights are taken away and placed in the weight box, then, the electric push rod 306 is reset, the ice skate 316-1 is driven to rise through the vertical movement component, the ice skate is lifted to the highest position for dismounting, meanwhile, the plastic simulation ice disc is dismounted, and at the moment, a working cycle is completed.
In the fourth step, the ice blade 316-1 is in contact with the plastic simulation ice disc 205 under the stress state to generate scratches, the height of the ice blade 316-1 can continue to descend, the laser range finder 317 can monitor the gap between the fixed counterweight 311 and the box-type bearing seat 310 below the fixed counterweight in real time, after the set distance is reached, the laser range finder 317 can send a signal to the controller, and the controller can send a signal to the servo motor 201 to stop rotating, so that the descending distance of the linear optical axis 309 is effectively limited and protected, and the ice blade is prevented from penetrating through the plastic simulation ice disc below the fixed counterweight 311.
In order to improve the utilization rate of the plastic simulation ice disc 205, the stepping motor 303 can drive the fixing seat 304 to move back and forth, so that the ice skate blade 316-1 slides on different radiuses of the plastic simulation ice disc 205.
The second mode of operation, namely the operation of measuring the sliding friction coefficient between the simulated ice experimental block 316-2 and the turntable 204, is as follows:
the test procedure is the same as the procedure of the first operation mode, and different places are that in the second step, the simulation ice experiment block 316-2 is fixed on the ice skate blade fixing seat 315, the plastic simulation ice disc 205 is removed from the turntable 204, and the fixing screws are removed, so that the cleanness of the top surface of the turntable is ensured. And repeating the first working mode to obtain the sliding friction force between the simulated ice experimental block 316-2 and the turntable 204, inputting the weight of the weight into the controller, transmitting the measured sliding friction force into the controller, and finally calculating by using a formula set by the data processing system to obtain the corresponding sliding friction coefficient.
The above-mentioned embodiments are only intended to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and those skilled in the art should also be able to make various modifications and improvements to the technical solution of the present invention without departing from the spirit of the present invention, and all such modifications and improvements are intended to fall within the scope of the present invention as defined in the appended claims.
Claims (10)
1. A measuring device for the coefficient of sliding friction between two objects is characterized in that: the device comprises a rack for supporting movement, wherein a testing piece two-positioning mechanism and a testing piece one-positioning mechanism are arranged on the rack, the testing piece one-positioning mechanism is installed on the rack through a fixed seat, the testing piece two-positioning mechanism is installed on a working platform of the rack, and the testing piece positioning mechanism drives an ice skate blade or an artificial ice experiment block to move downwards to be close to a plastic artificial ice disc on the testing piece two-positioning mechanism;
the device also comprises a pressure sensor, wherein the pressure sensor is connected to a guide shaft fixing plate of the testing piece-positioning mechanism through a pressure sensor fixing seat, and the working end of the pressure sensor is in contact with an ice skate fixing seat on the testing piece-positioning mechanism;
when the plastic simulation ice disk rotates, the plastic simulation ice disk is contacted with the ice skate blade or the simulation ice experiment block, and the sliding friction coefficient of the plastic simulation ice disk and the simulation ice experiment block is measured through the pressure sensor.
2. The apparatus for measuring a sliding friction coefficient between two objects according to claim 1, wherein: the second positioning mechanism of the test piece comprises a rotary driving device, a coupler, a turntable and a plastic simulation ice disc, the output end of the rotary driving device is in transmission connection with the coupler, the coupler penetrates through the mounting hole of the second positioning mechanism of the test piece on the working platform and is connected with the turntable, the plastic simulation ice disc is detachably mounted on the top surface of the turntable, and the top end of the coupler is locked by a pressing cap.
3. The apparatus for measuring a sliding friction coefficient between two objects according to claim 2, wherein: the section of the coupler is of a T-shaped structure and comprises a small-diameter shaft at the top and a large-diameter shaft at the bottom, the periphery of the small-diameter shaft is provided with threads, the compression cap is connected to the top through the threads, and the plastic simulation ice disc is sleeved on the small-diameter shaft and is in clearance fit with the small-diameter shaft; the large-diameter shaft is positioned in the mounting hole of the second positioning mechanism of the test piece, the bottom end of the large-diameter shaft is embedded into the rotary driving device, and the large-diameter shaft is connected with the rotary driving device through a screw and a pin; the turntable is sleeved on the small-diameter shaft and connected to the large-diameter shaft through a bolt.
4. A device for measuring the coefficient of sliding friction between two objects according to claim 3, wherein: the rotary driving device comprises a servo motor and a speed reducer which are connected together, the servo motor and the speed reducer are connected together through bolts, the speed reducer is connected to the working platform through bolts and pins, and the speed reducer is connected with the bottom of the coupler through the bolts.
5. The apparatus for measuring a sliding friction coefficient between two objects according to claim 2, wherein: the first testing piece positioning mechanism comprises a vertical movement assembly and an ice skate blade or a simulation ice experiment block, the vertical movement assembly is installed on a fixed seat, the ice skate blade or the simulation ice experiment block is installed at the working end of the vertical movement assembly, and the fixed seat is directly installed on a working platform of the rack.
6. The apparatus for measuring a sliding friction coefficient between two objects according to claim 5, wherein: the vertical motion assembly comprises an electric push rod, a guide shaft fixing plate, a linear optical axis and an installation assembly for fixing the ice skate blade or the ice cube, the top of the electric push rod is installed on a flat plate protruding from the top of the fixing seat through an electric push rod connecting plate, the bottom of the electric push rod is connected with the guide shaft fixing plate through a connecting plate, the linear optical axis is connected onto the guide shaft fixing plate through an upper box-type bearing seat and a lower box-type bearing seat, a fixed balancing weight is arranged in the middle of the linear optical axis, the bottom end of the linear optical axis is connected with the ice skate blade or the simulated ice experiment block through the installation assembly, and a weight is placed on the fixed balancing weight during operation;
the electric push rod moves in a telescopic mode to drive the guide shaft fixing plate to vertically move up and down through the connecting plate, and the linear optical axis and the ice skate or the simulated ice experiment block at the bottom generate sliding friction in different stress states under the action of positive pressure generated by different numbers of weights when the ice skate or the simulated ice experiment block is in rotary contact with the plastic simulated ice disc or the rotary disc.
7. The apparatus for measuring a sliding friction coefficient between two objects according to claim 6, wherein: the electric push rod connecting plate is arranged on a flat plate protruding from the top of the fixed seat through a bolt; the middle part of guide shaft fixed plate is installed with laser range finder, laser range finder with fixed balancing weight is corresponding, pressure sensor fixing base passes through bolted connection on the working face of guide shaft fixed plate.
8. The apparatus for measuring a sliding friction coefficient between two objects according to claim 7, wherein: the connecting plate comprises a first connecting plate and a second connecting plate which are arranged side by side, the guide shaft fixing plate is fixed on the front surfaces of the first connecting plate and the second connecting plate through bolts, and guide mechanisms are arranged between the bottom surfaces of the first connecting plate and the second connecting plate and the fixed seat;
the guide mechanism comprises a linear slide rail arranged on the fixed seat, and the bottom surfaces of the first connecting plate and the second connecting plate are in sliding connection with the linear slide rail and vertically move up and down along the linear slide rail.
9. The apparatus for measuring a sliding friction coefficient between two objects according to claim 7, wherein: the installation assembly comprises a guide shaft connecting plate and an ice skate fixing seat, the guide shaft connecting plate is connected to the bottom end of the linear optical axis, a sliding set is arranged between the ice skate fixing seat and the guide shaft connecting plate, and the ice skate or the simulated ice experiment block is installed on the ice skate fixing seat.
10. The apparatus for measuring a sliding friction coefficient between two objects according to claim 2, wherein: the test piece positioning mechanism comprises a horizontal movement assembly, the fixing seat is installed on the horizontal movement assembly, and the horizontal movement assembly is installed in an installation groove of the working platform; the horizontal motion subassembly includes horizontal slip table keysets, horizontal slip table and step motor, the horizontal slip table passes through the horizontal slip table keysets is installed in test piece positioning mechanism mounting groove, step motor's work end passes through the shaft coupling and is connected with the one end of lead screw, the other end of lead screw is rotatable to be installed on the horizontal slip table, threaded connection has on the horizontal migration seat on the lead screw, the bottom of fixing base with the horizontal migration seat is connected, and follow under step motor's the drive lead screw horizontal migration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022971912.7U CN214237826U (en) | 2020-12-11 | 2020-12-11 | Device for measuring sliding friction coefficient between two objects |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022971912.7U CN214237826U (en) | 2020-12-11 | 2020-12-11 | Device for measuring sliding friction coefficient between two objects |
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| Publication Number | Publication Date |
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| CN214237826U true CN214237826U (en) | 2021-09-21 |
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| CN202022971912.7U Active CN214237826U (en) | 2020-12-11 | 2020-12-11 | Device for measuring sliding friction coefficient between two objects |
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| CN (1) | CN214237826U (en) |
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