CN108732054B - Small-size round pin dish contact friction wear test device that reciprocates - Google Patents
Small-size round pin dish contact friction wear test device that reciprocates Download PDFInfo
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- CN108732054B CN108732054B CN201810287951.XA CN201810287951A CN108732054B CN 108732054 B CN108732054 B CN 108732054B CN 201810287951 A CN201810287951 A CN 201810287951A CN 108732054 B CN108732054 B CN 108732054B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/56—Investigating resistance to wear or abrasion
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0032—Generation of the force using mechanical means
- G01N2203/0033—Weight
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/0282—Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes
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Abstract
The invention provides a small-sized pin disc contact reciprocating friction wear test device. The structure of the device comprises a motor, a crank, a connecting rod, a nylon rod, a weight, a sliding block, a friction pin, a friction disk, a bridge circuit and the like. The power generated by the motor is transmitted to the connecting rod through the crank, and the connecting rod drives the bracket and the sliding block to reciprocate along the direction of the guide rail. The nylon rod is positioned in the bracket, and the friction pin is embedded in a blind hole at the bottom of the nylon rod; and a small pin plate friction pair is formed between the friction pin and the friction plate arranged between the two guide rails. The weight is loaded on the friction pair through the nylon rod in a normal pressure mode, the side face of the nylon rod is attached with a strain gauge, the strain gauge transmits reciprocating bending deformation sensed by the nylon rod to the bridge circuit in an electric signal mode, and a voltage signal is detected by the digital multimeter, so that the strain and the friction coefficient can be obtained finally. The invention has the advantages of ingenious structure and small volume, is an original reciprocating friction and wear test device, and is very suitable for small-sized enterprises and universities and colleges.
Description
Technical Field
The invention relates to the technical field of material friction and wear, in particular to a small-sized pin disc contact reciprocating friction and wear test device.
Background
Frictional wear is a natural phenomenon that exists between the surfaces of relatively moving objects. In engineering, friction and wear caused by relative movement of contacting parts are reduced for the life of the parts and equipment. In selecting the materials, the frictional wear characteristics of the mating materials are first measured and analyzed to obtain the best mating material.
A reciprocating type friction and wear testing machine and a computer control system are designed in a key laboratory Liu Yongping and the like of the 2010 department of science and education of the Lanzhou university of science and ministry of province co-construction, and a grinding head of the testing machine is supported by a plate spring. A reciprocating type friction and wear testing machine is designed for a semi-oil pipe and a semi-circular support ring with corresponding inner diameter to perform friction and wear tests on centralizers with different sizes in the spring east of mechanical engineering college Yaohun of Yanshan university in 2009. Other designs friction pair type reciprocating of ball and plane contact adopt rack and pinion to realize reciprocating motion.
Friction wear testers are used in many different applications in real engineering, with many contact patterns, but they are expensive, often hundreds of thousands and millions, and are too expensive to be experimented with for small business and school students.
Disclosure of Invention
The invention aims to provide a small pin disc contact reciprocating friction and wear test device, which solves the problem that the friction and wear test machine used in the existing practical engineering is high in manufacturing cost and is not suitable for small enterprises and school students.
The purpose of the invention is realized as follows: a small-sized pin disc contact reciprocating friction and wear test device comprises a motor, a crank, a connecting rod, a nylon rod, a weight, a sliding block, a friction pin, a friction disc, a bridge circuit and the like; an output shaft of the motor is connected with a connecting rod through a crank, the connecting rod is connected with the sliding blocks on the two guide rails through a bracket, the bracket is arranged between the two guide rails, and the bracket is fixedly connected with the sliding blocks; under the action of the motor, the bracket and the sliding block can be driven to reciprocate along the direction of the guide rail by the crank and the connecting rod; a nylon rod is connected to the support in a penetrating manner, a blind hole is formed in the lower end of the nylon rod, and a friction pin is installed in the blind hole in the lower end of the nylon rod; a friction disc is arranged below the support between the two guide rails, and the bottom end of the friction pin and the surface of the friction disc form a small pin disc friction pair; the nylon rod can be loaded with a weight as a load, and the weight loads the load on the friction pair through the nylon rod in the form of normal pressure; the side surface of the nylon rod is pasted with a strain gauge which is connected with a bridge circuit, the strain gauge can transmit reciprocating bending deformation sensed by the nylon rod to the bridge circuit in the form of an electric signal, and a voltage signal is detected by a digital multimeter (calibrated), so that strain and a corresponding friction coefficient in the friction and wear process can be calculated.
The bridge circuit comprises a balanced bridge and a power supply; strain gauges with specific resistance values are respectively arranged on four bridge arms of the balance bridge, wherein one strain gauge is a strain gauge attached to the side face of the nylon rod; the power supply is connected with one diagonal of the balance bridge, and the other diagonal of the balance bridge is connected with the digital multimeter. The power supply can be a WWL-LDX precise linear direct current voltage and current stabilizing power supply. The model of the digital multimeter is OWON B35.
Be provided with weight anchor clamps on the support, weight anchor clamps are tubular structure, and the loading is in weight on the nylon rod is located inside the weight anchor clamps, it can be right through a plurality of screws that pass weight anchor clamps lateral wall the weight locks to make the weight transmit load to the nylon rod with normal pressure's form.
A transversely through slit is formed in the position, close to the upper end, of the nylon rod, the long side of the slit is in the vertical direction (namely the axial direction of the nylon rod), and the short side of the slit is in the horizontal direction; the metal sheet is arranged in the slit of the nylon rod, and two ends of the metal sheet extend out of the slit of the nylon rod; a circular through hole is formed in the top of the support, and two opposite vertical through grooves are formed in the inner side wall of the circular through hole; the nylon rod penetrates through the circular through hole in the top of the support, and two ends of the metal sheet just extend into the two vertical through grooves in the circular through hole of the support. Realize clearance fit between sheetmetal and two vertical logical grooves, the circular through-hole that the support top can be followed to the nylon stick like this reciprocates, but the relative support of nylon stick can not realize rotating. The nylon rod can move up and down (but can not move up and down after loading load), and then the friction pin can be conveniently assembled and disassembled, so that the abrasion loss of the friction pin can be measured at any time.
A friction disc clamp is arranged between the two guide rails, a groove is formed in the upper surface of the friction disc clamp, the friction disc is fixed in the groove of the friction disc clamp, the position of the friction disc can be adjusted in the groove according to needs, and dry friction environment without lubricating oil and lubricated friction environment tests with lubricating oil can be performed according to needs. The friction disc clamp may be fixedly mounted on the base. The motor and the guide rail can also be arranged on the base.
The output shaft of the motor is connected with a main shaft through a coupling, and a mortise and tenon connection structure matched with the crank by 90 degrees is formed between the main shaft and the crank.
Two identical sliding blocks are arranged on each guide rail, and the two identical sliding blocks on each guide rail are connected together. The four sliding blocks on the two guide rails slide together in a reciprocating manner under the driving of the bracket, and the reciprocating sliding is smooth. If a sliding block is arranged on each guide rail, the situation that sliding in one direction is smooth and sliding in the opposite direction is blocked can occur, and reciprocating motion cannot be finished.
The device mainly generates power by a motor, the power generated by the motor is transmitted to the connecting rod through the crank, and the connecting rod drives the bracket and the sliding block to reciprocate along the direction of the guide rail. The bracket is relatively fixedly connected with the sliding block; the nylon rod is positioned in the bracket, and the friction pin is embedded in a blind hole at the bottom of the nylon rod; and a small pin-disc contact reciprocating friction pair is formed between the friction pin and the friction disc arranged between the two guide rails. The nylon rod is restrained from relative rotation by a metal sheet (e.g., an iron sheet) inserted therein, but the nylon rod can be moved up and down to access and replace the friction pin. Be connected with the weight anchor clamps that are used for fixed weight on the support, the weight passes through the nylon stick with the form of normal pressure with the load and adds the friction pair on, the load is with the weight size meter, and is very accurate, and the weight can be changed very conveniently moreover. And (3) pasting a strain gauge on the nylon rod, connecting the strain gauge into a bridge circuit, measuring a voltage signal (after calibration) by using a digital multimeter, further obtaining the strain in the abrasion process, and finally calculating the friction coefficient.
The invention can realize the friction and wear test of the pin disc friction pair under the conditions of dry friction and lubrication with speed change and load change (within 10 kg). Its structure is ingenious, small in size, is a reciprocating friction wear test device of a section original, is applicable to very much that material friction wear contrast of small enterprise and colleges carry out the friction wear teaching experiment, and dynamic strain test system price is low a lot more for bridge circuit compares, and the material is selected to be changed very conveniently moreover, and is very practical.
Drawings
FIG. 1 is a front view of a small pin-disk contact reciprocating frictional wear test apparatus of the present invention.
FIG. 2 is a top view of the small pin disk contact reciprocating frictional wear test apparatus of the present invention.
FIG. 3 is a schematic view of the construction of the spindle of the present invention; in which fig. 3 (a) is a front view of the main shaft, fig. 3 (b) is a right side view of fig. 3 (a), and fig. 3 (c) is a sectional view of a sectional line shown in fig. 3 (a).
FIG. 4 is a schematic view of the crank of the present invention; fig. 4 (a) is a front view of the crank, and fig. 4 (b) is a plan view of fig. 4 (a).
FIG. 5 is a schematic view of the structure of the guide rail and the slider of the present invention; fig. 5 (a) is a front view of the guide rail and the slider, fig. 5 (b) is a plan view of fig. 5 (a), and fig. 5 (c) is a left side view of fig. 5 (a).
FIG. 6 is a schematic structural view of a stent according to the present invention; fig. 6 (a) is a front view of the holder, fig. 6 (b) is a plan view of fig. 6 (a), and fig. 6 (c) is a left side view of fig. 6 (a).
FIG. 7 is a schematic structural view of a cross-beam according to the present invention; fig. 7 (a) is a front view of the cross member, fig. 7 (b) is a left side view of fig. 7 (a), and fig. 7 (c) is a plan view of fig. 7 (a).
FIG. 8 is a schematic view of the construction of the friction disc holder of the present invention; fig. 8 (a) is a front view of the friction disc clamp, and fig. 8 (b) is a plan view of fig. 8 (a).
FIG. 9 is a schematic structural view of a nylon rod of the present invention; fig. 9 (a) is a front view of the nylon rod, fig. 9 (b) is a left side view of fig. 9 (a), and fig. 9 (c) is a plan view of fig. 9 (a).
FIG. 10 is a schematic view showing the structure of a weight jig according to the present invention; fig. 10 (a) is a front view of the weight holder, and fig. 10 (b) is a plan view of fig. 10 (a).
Fig. 11 is a structural schematic diagram of a mechanical model established by regarding a nylon rod as a cantilever arm in the invention.
FIG. 12 is a graphical representation of the results of the present invention using a TST5916USB dynamic signal test analysis system.
Fig. 13 is a schematic diagram of a bridge circuit according to the present invention.
FIG. 14 is a graphical representation of a portion of the voltage output of a digital multimeter of the present invention.
FIG. 15 is a graphical representation of the results of the present invention using a bridge circuit.
In the figure: 1. the device comprises a motor, 2, a crank, 3, a connecting rod, 4, a nylon rod, 5, a weight, 6, a weight clamp, 7, a screw, 8, an iron sheet, 9, a strain gauge, 10, a guide rail, 11, a sliding block, 12, a friction pin, 13, a support, 14, a base, 15, a friction disc clamp, 16 and a coupler.
Detailed Description
As shown in figures 1 and 2, the small pin disc contact reciprocating friction wear test device provided by the invention completes friction wear by driving a crank-slider mechanism through a direct-current speed regulating motor. Specifically, the device comprises a motor 1, a crank 2, a connecting rod 3, a nylon rod 4, a weight 5, a strain gauge 9, a sliding block 11, a friction pin 12, a friction disc 15, a bridge circuit, a digital multimeter and the like.
The motor 1 may be connected to a speed governor for varying the frequency of reciprocation. The power generated by the motor 1 is connected with a main shaft through a coupling 16, and the structural schematic diagram of the main shaft is shown in fig. 3. One end of the main shaft is connected with the output shaft of the motor 1 through a coupler 16, the other end of the main shaft is provided with a bulge, the bulge is connected with a groove at one end of the crank 2 in a matching way, and the structural schematic diagram of the crank 2 is shown in figure 4. The protrusion with the width of 10mm at one end of the main shaft and the groove with the width of 10mm at one end of the crank 2 are mutually matched in an angle of 90 degrees (namely, the main shaft and the crank 2 are mutually and vertically connected) to form mortise and tenon connection, and are fastened by using a screw M6, so that the main shaft and the crank 2 form an integral connecting structure rotating together. The main shaft and the crank are connected by adopting the protrusion (for example, a wedge-shaped structure) and the groove to be matched and the screw, so that the relative rotation of the crank and the main shaft is skillfully prevented, and the main shaft and the crank form a whole rotating together. The crank is provided with a groove-shaped structure, the reciprocating stroke can be changed by changing the length of the crank, and the length of the crank can be changed according to the size of the friction disc.
The crank 2 can drive the slide block 11 to move on the guide rail 10 through the connecting rod 3. As shown in fig. 5, the guide rails 10 are two parallel linear guide rails, each of the guide rails is provided with two identical sliders 11, the two identical sliders on each of the guide rails are connected together, and the four sliders 11 on the two guide rails 10 slide together in a reciprocating manner smoothly. If a sliding block is arranged on each guide rail, the situation that sliding in one direction is smooth and sliding in the opposite direction is blocked can occur, and reciprocating motion cannot be finished.
The sliding blocks 11 on the two guide rails 10 are connected together by a bracket 13. As shown in fig. 6, the bracket 13 is in a laterally symmetrical "u" shape, and the left and right bottom edges of the bracket 13 are respectively connected with the rolling bearings of the sliding blocks on the two guide rails (the sliding blocks slide on the guide rails through the rolling bearings), and under the action of the bracket 13, the sliding blocks can be driven to move along the guide rails. A circular through hole is formed at the top of the bracket 13, and two opposite vertical through grooves are formed in the inner side wall of the circular through hole.
The bracket shown in fig. 6 is assembled with the cross beam shown in fig. 7 and connected with a sliding block with a rolling bearing which is arranged on a guide rail, so that the sliding block can be driven to reciprocate together.
As shown in fig. 7, the beam includes a rod-shaped beam main body and a U-shaped lifting lug arranged at the middle part of the beam main body, and the opening direction of the U-shaped lifting lug is perpendicular to the axial direction of the beam main body; the two ends of the beam main body are respectively connected to the two vertical side arms of the bracket 13 through screws, and the U-shaped lifting lug is connected with one end of the connecting rod 3.
An output shaft of the motor 1 drives the main shaft to rotate, so as to drive the crank 2 to rotate, and the crank 2 drives the cross beam, the bracket and the sliding block to reciprocate along the direction of the guide rail through the connecting rod 3.
A friction disc clamp 15 is arranged between the two guide rails 10, as shown in fig. 8, the friction disc clamp can be fixed on the base 14 through screws, and the guide rails 10 and the motor 1 are also arranged on the base 14. A recess is provided in the middle of the upper surface of the friction disc holder, and the friction discs, i.e. the friction discs, are mounted in the recesses in the friction disc holder 15, the clamping position of the friction discs on the friction disc holder 15 being adjustable according to the size of the friction pins 12.
The friction pin 12 of the invention is arranged in a blind hole at the lower end of the nylon rod 4 and is fixed by a set screw. As shown in FIG. 9, the nylon rod is a rod-shaped structure, and the bottom of the nylon rod is provided with a blind hole. After the friction pin 12 is installed in the blind hole, the bottom of the friction pin is exposed outside the nylon rod. The nylon rod is provided with a transversely through slit (in a rectangular structure) close to the upper end, the long side of the slit is in the axial direction (vertical direction in the figure) of the nylon rod, the short side of the slit is in the horizontal direction, the long side of the slit is 26mm, and the short side of the slit is 3 mm. An iron sheet 8 is arranged in the slit of the nylon rod 4, and two ends of the iron sheet 8 extend out of the slit of the nylon rod.
In the vertical circular through-hole that inserts support 13 top of nylon stick 4, during the insertion, should make 8 both ends of iron sheet just in time be located support 13 and go up two vertical logical inslots relative in the circular through-hole, realize clearance fit between iron sheet 8 and two vertical logical grooves, nylon stick 4 can follow the circular through-hole at support 13 top like this and reciprocate, but nylon stick 4 relative support 13 can not realize rotating. The nylon rod 4 can move up and down (but can not move up and down after loading), and then the friction pin 12 can be conveniently assembled and disassembled, so that the abrasion loss of the friction pin 12 can be measured at any time. The nylon rod 4 can not rotate relative to the bracket 13, and the rotation phenomenon of the friction pin 12 in the reciprocating process can be prevented.
During the reciprocating movement of the nylon rod 4 along with the bracket 13, a friction pair is formed between the friction pin 12 and the friction disc. Weight 5 passes through weight anchor clamps 6 and adds the friction pair through nylon rod 4 with load in normal pressure's form, and load is counted with the weight size moreover, and is very accurate, and weight 5 can be changed. The structure of weight anchor clamps 6 is as shown in fig. 10, and weight anchor clamps 6 are the tubular structure, have the screw hole of 90 degrees apart on the weight anchor clamps 6, and back on the nylon stick 4 is added to the weight 5, by the position of four screw adjustment weights 5, guarantee on the weight 5 loads the nylon stick 4 perpendicularly, and then transmit on the vice contact surface of friction. The left side and the right side of the weight clamp 6 are connected with the top of the bracket 13 through angle iron, so that the weight of the weight clamp 6 is ensured to be added on the guide rail 10 but not on the nylon rod and the friction pin.
The material for sensing bending deformation in the present invention is a nylon rod, because the nylon rod has an elastic modulus of about 2.83 × 10-7Gpa, carbon steel is about 2X 10-6Gpa is lower than that of a metal material, has certain bearing capacity, is non-conductive, and is easy to sense stress of bending deformation, so that a strain gauge 9 is attached to the nylon rod 4, bending strain is easy to measure by combining the nylon rod 4 with the strain gauge 9, and friction force is obtained through calculation, so that the friction coefficient is obtained.
The nylon rod 4 is pasted with the strain gauge 9, the reciprocating bending deformation sensed by the nylon rod 4 with lower rigidity is transmitted out in an electric signal mode, and after passing through a bridge circuit, a voltage signal is output to a computer by a calibrated digital multimeter (with Bluetooth) for data processing.
The device mainly comprises a motor 1 for generating power, a main shaft connected with the motor through a coupling 16, a crank 2 and a crank 2 which are integrated into a whole, wherein the crank 2 and a connecting rod 3 are movably connected, and a driving bracket 13 and a sliding block 11 reciprocate along the direction of a guide rail 10. The bracket 13 is relatively fixedly connected with the slide block 11; the nylon rod 4 is positioned in the holder 13, the nylon rod 4 being restricted in its relative rotation by the iron piece 8 inserted therein, but the nylon rod 4 can be moved up and down to take and replace the friction pin 12. The support 13 is connected with a weight clamp 6, the weight clamp 6 is provided with four screws 7 which are separated by 90 degrees and used for fixing the weight 5, and the positioning length of the screws can be adjusted so as to adapt to weights with different sizes.
And a strain gauge 9 is attached to the nylon rod 4 in the abrasion process and is connected into the bridge circuit of the invention to obtain the strain in the abrasion process, and then the friction coefficient is calculated.
A mechanical model as shown in fig. 11 was established according to the theory of material mechanics.
The nylon rod 4 is considered as a cantilever beam during the frictional wear. And (3) calculating the bending stress according to the relation between the stress and the strain when the cantilever beam is subjected to the bending moment:
in formula (1): σ is the bending stress;Eis the elastic modulus of a nylon rod; is an elastic strain.
The calculation formula according to the bending stress comprises:
in the formula (2), the reaction mixture is,Mbending moment of the nylon rod at the position of pasting the strain gauge;W z the bending-resistant section coefficient of the nylon rod;Fis a friction force;lthe distance from the friction surface contacted by the pin disc to the central position of the strain gauge.
Then
（3）
Coefficient of friction f =F/N，NIs a positive pressure, i.e. weight.
In this embodiment, a dynamic strain test system is used to calibrate the test of a bridge circuit, the structure of the bridge circuit is shown in fig. 13, the bridge circuit includes a balance bridge and a power supply connected to one diagonal of the balance bridge, and the other diagonal of the balance bridge is connected to a digital multimeter, the power supply used in this embodiment is a WWL-LDX precision linear direct current voltage and current stabilizing source, and the digital multimeter is of the type OWON B35. Four fixed strain gauges (with the same resistance value) form four bridge arms of the balance bridge, and variable resistors are connected to two adjacent bridge arms to serve as trimming resistors. One of the four fixed strain gauges is a strain gauge 9 (same specification and replaceable) attached to the nylon rod 4. And connecting the strain gauge attached to the same steel plate tensile sample into a balance bridge to enable the output of the bridge to be zero, repeating the process of loading in the elastic range on a tensile testing machine, recording the voltage value of the digital multimeter, and obtaining the corresponding relation between the load and the voltage. Multimeter readings were recorded during the same loading process as shown in Table 1.
In the test in this embodiment, two identical strain gauges are respectively attached to both sides of the nylon rod 4, one strain gauge is connected to the dynamic strain test system, and the other strain gauge is connected to the bridge circuit of the present invention for simultaneous measurement.
The dynamic strain test system specifically adopts a TST5916USB dynamic signal test analysis system of Tester. And in the calibration process, a strain gauge is attached to a sheet type steel plate tensile sample, a TST5916USB dynamic signal test analysis system is accessed, static tensile measurement is carried out in an elastic range, and a corresponding value is recorded. Fig. 12 shows the result of the TST5916USB dynamic signal test analysis system, and as can be seen from fig. 12, the average value of the strain is 161.
The partial voltage output of the digital multimeter is shown in FIG. 14.
The voltage was converted to a strain value and the time was plotted against the strain as shown in fig. 15. As can be seen from FIG. 15, the average value of the final strain was-159. Since the two strain gauges on the nylon rod are attached in opposite directions, this is negative. And (3) calculating a measurement error by adopting an absolute value, wherein the error is as follows: (161-159)/161 = 1.2%. Obviously, the error is within the allowable range.
The dynamic signal testing and analyzing system can be bought at a price of about one hundred thousand yuan, and the bridge circuit testing method only needs about one thousand yuan, so that the method can save a lot of cost.
The basic principles, key features and methods of operation of the frictional wear test apparatus of the present invention have been shown and described. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A small-sized pin disc contact reciprocating friction and wear test device is characterized by comprising a motor, a crank, a connecting rod, a nylon rod, a weight, a sliding block, a friction pin, a friction disc and a bridge circuit; the output shaft of the motor is connected with a connecting rod through a crank, the connecting rod is connected with the sliding blocks on the two guide rails through a bracket, the bracket is in a bilaterally symmetrical inverted U-shaped structure, the bracket is arranged between the two guide rails, and the left bottom edge and the right bottom edge of the bracket are respectively connected with the rolling bearings of the sliding blocks on the two guide rails; two vertical side arms of the bracket are respectively connected with a connecting rod through a cross beam; the beam comprises a rod-shaped beam main body and a U-shaped lifting lug arranged in the middle of the beam main body, the opening direction of the U-shaped lifting lug is vertical to the axial direction of the beam main body, two ends of the beam main body are respectively connected to two vertical side arms of the support through screws, and the U-shaped lifting lug is connected with one end of a connecting rod; under the action of the motor, the bracket and the sliding block can be driven to reciprocate along the direction of the guide rail by the crank and the connecting rod; the nylon rod is connected on the bracket in a penetrating manner, a blind hole is formed in the lower end of the nylon rod, and the friction pin is installed in the blind hole in the lower end of the nylon rod; a friction disc is arranged below the support between the two guide rails, and the bottom end of the friction pin and the surface of the friction disc form a small pin disc friction pair; the nylon rod can be loaded with a weight as a load, and the weight is loaded on the friction pair through the nylon rod in a normal pressure mode; the side surface of the nylon rod is pasted with a strain gauge which is connected with a bridge circuit, the strain gauge can transmit reciprocating bending deformation sensed by the nylon rod to the bridge circuit in the form of an electric signal, and a voltage signal is detected by a digital multimeter, so that strain in the friction and wear process can be obtained, and further a friction coefficient can be calculated;
the weight clamp is arranged on the support and is of a cylindrical structure, the weight loaded on the nylon rod is positioned in the weight clamp, and the weight is locked by a plurality of screws penetrating through the side wall of the weight clamp so as to transmit the load to the nylon rod in a normal pressure mode;
a transversely through slit is formed in the position, close to the upper end, of the nylon rod, the long side of the slit is in the vertical direction, and the short side of the slit is in the horizontal direction; the metal sheet is arranged in the slit of the nylon rod, and two ends of the metal sheet extend out of the slit of the nylon rod; a circular through hole is formed in the top of the support, and two opposite vertical through grooves are formed in the inner side wall of the circular through hole; the nylon rod penetrates through the circular through hole in the top of the support, and two ends of the metal sheet just extend into the two vertical through grooves in the circular through hole of the support;
a friction disc clamp is arranged between the two guide rails, a groove is formed in the upper surface of the friction disc clamp, the friction disc is fixed in the groove of the friction disc clamp, and the position of the friction disc can be adjusted in the groove as required; the small pin disc contact reciprocating friction wear test device also comprises a base, wherein the friction disc clamp, the motor and the guide rail are all arranged on the base;
the output shaft of the motor is connected with a main shaft through a coupling, and a mortise and tenon connection structure matched at 90 degrees is formed between the main shaft and the crank; the crank is provided with a groove-shaped structure, and the reciprocating stroke can be changed by changing the length of the crank;
two identical sliding blocks are arranged on each guide rail, and the two identical sliding blocks on each guide rail are connected together.
2. The apparatus for testing contact reciprocating frictional wear of a miniature pin and disc as set forth in claim 1, wherein said bridge circuit comprises a balanced bridge and a power supply; strain gauges with specific resistance values are respectively arranged on four bridge arms of the balance bridge, wherein one strain gauge is a strain gauge attached to the side face of the nylon rod; the power supply is connected with one diagonal of the balance bridge, and the other diagonal of the balance bridge is connected with the digital multimeter.
3. The apparatus of claim 2, wherein the power supply is a WWL-LDX precision linear dc regulated voltage regulated current regulated power supply.
4. The apparatus for testing contact reciprocating frictional wear of small-sized pin discs as claimed in claim 2, wherein the digital multimeter is a model number OWON B35.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810287951.XA CN108732054B (en) | 2018-04-03 | 2018-04-03 | Small-size round pin dish contact friction wear test device that reciprocates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810287951.XA CN108732054B (en) | 2018-04-03 | 2018-04-03 | Small-size round pin dish contact friction wear test device that reciprocates |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108732054A CN108732054A (en) | 2018-11-02 |
| CN108732054B true CN108732054B (en) | 2020-12-29 |
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| CN201810287951.XA Expired - Fee Related CN108732054B (en) | 2018-04-03 | 2018-04-03 | Small-size round pin dish contact friction wear test device that reciprocates |
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| CN109932266A (en) * | 2019-04-23 | 2019-06-25 | 无锡信昌机械科技有限公司 | A kind of adjustable rub resistance testing agency of push-and-pull stroke |
| CN110160906B (en) * | 2019-06-24 | 2024-03-22 | 安徽理工大学 | Reciprocating friction and wear testing machine with lubricating and compound force loading system |
| CN110702601B (en) * | 2019-10-14 | 2021-12-03 | 江苏科技大学 | Double-arm micro-load electric brush current-carrying friction test method |
| CN111912730A (en) * | 2020-07-15 | 2020-11-10 | 扬州市舜意机械有限公司 | Wear testing machine for self-lubricating gasket of joint bearing |
| CN111929234B (en) * | 2020-09-24 | 2020-12-15 | 成都理工大学 | Device for measuring friction coefficient of drilling plugging material |
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