Stable-loading ball disc opposite-grinding pairing pair structure and test method

Abstract

The invention discloses a stably-loaded ball disc pair-grinding pairing pair structure and a test method, the ball disc pair-grinding pairing pair structure is provided with a leveling platform on a rotating platform in a transposition component, and the leveling of a friction disc can be realized through the leveling platform; end face jumping caused by coaxiality errors in the machining and mounting processes of the friction disc and the main shaft is eliminated to a certain extent, and preconditions are created for stable loading of a ball disc pairing pair; the linear bearing is used in the loading part to ensure that the ball disc pairing pair is not subjected to radial vibration caused by tangential force in the loading process, and the damping spring piece is used for absorbing tiny axial vibration caused by friction, so that load fluctuation at the contact position of the pairing pair can be weakened, and stable loading of the ball disc pairing pair is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of precision machinery, and in particular relates to a ball-disc grinding pair structure with stable loading and a test method. Background Art

[0002] Sliding electrical contact pairs such as space conductive slip rings, carbon slide plates of bow-net systems and contact wires all have material friction and wear behavior under normal working conditions, while the contact area of ​​the pair under the electric field environment presents a complex situation of multi-physical field coupling due to the existence of Joule heat and friction heat. Large input current, unstable contact pressure, and excessive temperature rise in the contact area will seriously affect the normal operation of the sliding pair. Studying the friction and wear mechanism of the sliding electrical contact pair is of great significance to improving the design of the pair and increasing its service life.

[0003] The current traditional sliding friction and wear test benches mostly use cylinders, oil cylinders or simple weights to apply loads. Under specific experimental conditions, the above loading methods are affected by the mechanical structure itself, the environment, and the vibration of the machine tool itself. It is difficult to obtain long-term stable contact loads, which affects the accuracy of the measurement data. In addition, due to processing quality issues, there are certain deviations in the flatness and coaxiality of the paired pairs, and a leveling device is required to pre-level the paired pairs. During the experiment, the wear between the paired pairs will cause the contact load at the contact position to fluctuate, and the traditional rigid contact method cannot adjust the size of the contact load in time, and it is difficult to absorb the fluctuation of the contact load, and it is impossible to achieve stable loading of the paired pairs.

[0004] The invention patent application with publication number CN118032324A proposes a friction and wear test bench and test method for multiple motion pairs of axial piston pumps. During measurement, the loading cylinder is driven by the loading unit controller to apply a set axial load, and the input shaft is driven to rotate by the motor controller to perform friction and wear experiments. The results are recorded by the information acquisition unit, including axial load, input shaft torque, input shaft speed, equivalent friction radius of the test piece, etc., and the friction coefficient is calculated based on this. However, the above-mentioned friction and wear test bench is not equipped with a leveling device, which cannot isolate the influence of environmental vibration and the cylinder structure (leakage) itself, and the energy absorption buffer device is not set during the loading process to process the vibration of the motor and the system. The axial load and input shaft torque collected by the information acquisition unit are actually fluctuating values, which may cause large errors in the measurement results.

[0005] The utility model patent with publication number CN219475272U proposes a friction and wear test bench, which uses weights to apply torque by rotating a loading ring at a certain angle, measures the rotation angle through a dial indicator connected to the loading ring to deduce the friction torque, and finally calculates the equivalent friction force and friction coefficient on the contact surface of the test piece. In this friction and wear test bench, the weights of the loading device of the friction and wear experiment are placed in a water environment, eliminating the influence of most environmental factors on the stability of the loading force during the loading process. However, the device still uses a rigid connection method, and no buffer is set between the weights of the loading device and the loading ring. Due to the existence of inertia, the torque received by the loading ring during the loading process is not a fixed value, but a fluctuating value. This will also lead to certain errors in the measurement results.

[0006] The technical problem to be solved by the present invention is to stably load a ball-disk grinding pair in sliding contact. Summary of the invention

[0007] The invention provides a stably loaded ball-disc grinding pair structure and a test method. The ball-disc grinding pair structure can ensure the stable loading capacity of the ball-disc grinding pair under a large load.

[0008] In order to achieve the above object, the present invention adopts the following specific technical solutions:

[0009] The present invention provides a ball-disk grinding pair structure with stable loading, the ball-disk grinding pair structure comprises a vibration isolation platform, a loading component, a transfer component and a control unit;

[0010] The loading component is used to achieve stable loading of force load and electrical load, and includes a load support, a linear module, a first motor, a linear displacement slide, an inclined wedge support block, a horizontal slide, a pad, a three-dimensional force sensor, a fixture base, a linear bearing, an insulating fixture, a vibration-damping spring sheet, a linear bearing seat, a core shaft, a bearing mounting plate and an electrical conductor; the bottom end of the load support is fixedly connected to the top surface of the vibration isolation platform; the linear module is fixedly installed on the load support; the linear displacement slide can be installed on the linear module in a reciprocating manner in a vertical direction; the first motor is used to drive the linear displacement slide to reciprocate along the linear module; the inclined wedge support block is fixedly installed on the linear displacement slide The top of the table; the inclined wedge support block, the horizontal slide, the pad, the three-dimensional force sensor, the fixture base and the bearing mounting plate are fixedly connected in sequence from bottom to top; the insulating fixture is used to fix the test piece; the linear bearing is connected to the bearing mounting plate by threads; the mandrel passes through the linear bearing, the top end is connected to the insulating fixture by threads, and the bottom end is connected to the linear bearing seat by pins; the vibration-damping spring sheet is fixedly installed in the fixture base; the linear bearing seat is fixedly installed on the top surface of the vibration-damping spring sheet; the electrical wire passes through the mandrel and the vibration-damping spring sheet and is led out from the side of the fixture base to realize the electrical connection between the test piece and the power supply;

[0011] The indexing component is used to drive the friction disc to switch between the initial state and the friction state; when the friction disc is in the friction state, the friction disc is in contact with the test piece; when the friction disc is in the initial state, the friction disc is separated from the test piece; the indexing component includes a second motor, a rotating table, an adjustment platform, a rotating table column, a sapphire disc, a fixed short shaft, an upper triangular plate, a third motor, a carbon brush, a main shaft, a friction disc and a lower triangular plate; the rotating table can be rotatably mounted on the top surface of the vibration isolation platform; the second motor is used to drive the rotating table to rotate; the rotating table, the adjustment platform and the lower triangular plate are fixedly connected in sequence from bottom to top ; The upper triangular plate is mounted on the top of the lower triangular plate through the six turntable columns; the fixed short shaft is arranged in the vertical direction and fixedly mounted on the top of the upper triangular plate; the sapphire plate is fixedly mounted on the fixed short shaft; the main shaft is arranged in parallel with the fixed short shaft and can be rotatably mounted on the upper triangular plate and the lower triangular plate; the friction plate is located on the top of the upper triangular plate and is coaxially and insulatedly fixedly mounted on the main shaft; the third motor is fixedly mounted on the upper triangular plate for driving the main shaft to rotate; the carbon brush is insulated and fixedly mounted on the top of the upper triangular plate and contacts the outer edge of the friction plate;

[0012] The control unit is connected to the three-dimensional force sensor, the first motor, the second motor and the third motor signals, and is used to control the first motor, the second motor and the third motor to load the test piece and switch the state of the friction disk.

[0013] Furthermore, the indexing component further comprises a rigid gland, a rigid gasket, an insulating gasket, a shoulder pin, an insulating flange and a double locking nut located on the upper side of the upper triangular plate;

[0014] The rigid gasket, the insulating flange, the insulating gasket and the rigid gland are sequentially mounted from bottom to top along the axial direction of the main shaft, and the rigid gland is compressed by the double locking nut threadedly connected to the main shaft;

[0015] There are multiple shoulder pins evenly distributed along the circumference of the main shaft. The shoulder pins pass through the rigid pressure cover, the insulating gasket and the insulating flange in sequence and are fixedly connected to the rigid gasket, so as to embed the friction disk between the insulating gasket and the insulating flange along the axial direction of the main shaft.

[0016] Furthermore, the indexing component further comprises a double angular contact ball bearing, a bearing end cover, a snap ring and an angular contact ball bearing;

[0017] The main shaft is supported on the upper triangular plate by the double angular contact ball bearings, and is supported on the lower triangular plate by the angular contact ball bearings;

[0018] The double angular contact ball bearing is mounted on the upper triangular plate through the bearing end cover and the retaining ring.

[0019] Furthermore, the main shaft is provided with a shoulder located on the upper side of the upper triangular plate; the bottom end surface of the rigid gasket abuts against the shoulder.

[0020] Furthermore, the indexing component also includes a rotating table base, a flexible gland, a locking nut and a transmission mechanism;

[0021] The base of the rotating table is fixedly mounted on the vibration isolation platform; the second motor and the rotating table are fixedly mounted on the base of the rotating table; a worm gear transmission mechanism is transmission-connected between the second motor and the rotating table; the top end of the fixed short shaft is threadedly connected with the locking nut; the locking nut presses the sapphire disk through the flexible gland; the output end of the third motor is fixedly connected with a reducer, and the reducer is fixedly mounted on the upper triangular plate; the output shaft of the reducer is transmission-connected to the main shaft through the transmission mechanism;

[0022] The carbon brush is mounted on the upper triangular plate through a carbon brush bracket.

[0023] Furthermore, the transmission mechanism is a belt transmission mechanism, and includes a driving pulley, a driven pulley and a belt;

[0024] The driving pulley is fixedly mounted on the output shaft of the reducer;

[0025] The driven pulley is fixedly mounted on the main shaft;

[0026] The belt is installed between the driving pulley and the driven pulley.

[0027] Furthermore, the vibration-damping spring sheet is made of a soft steel material with a thickness of 0.1 mm.

[0028] Furthermore, the vibration-damping spring sheet adopts an upper and lower double-layer structure, and a rigid pad is fixedly connected between the two layers.

[0029] In addition, the present invention also provides a test method for the above-mentioned ball-disc grinding pair structure, and the test method comprises the following steps:

[0030] The second motor drives the rotating table to rotate so that the friction disk rotates to the position directly above the test piece;

[0031] The friction disc is driven to rotate by a third motor;

[0032] The linear module is driven by the first motor to move the test piece upward. When the test piece contacts the friction disk, the load is continuously applied. The load signal detected by the three-dimensional force sensor is used to determine whether the current load reaches the specified load. When the specified load is reached, the first motor brake is controlled to lock.

[0033] When the friction and wear test reaches a predetermined time, the first motor drives the test piece to descend to a specified height so that the test piece is out of contact with the friction disk; and the third motor is controlled to stop rotating.

[0034] Furthermore, when the test piece is driven upward by the first motor to drive the linear module, the carbon brush and the electric wire are respectively connected to the two poles of the power supply so that the current only passes through the friction disk and the test piece.

[0035] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0036] 1. The ball-disc grinding pair structure of the present invention is provided with an adjustment platform on the rotating table in the indexing component, through which the friction disc can be leveled, which eliminates the end face runout caused by the coaxiality error between the friction disc and the spindle during the processing and installation process to a certain extent, and creates the prerequisite for realizing the stable loading of the ball-disc pair. At the same time, the friction disc can also be leveled by the shoulder pin shaft, which further reduces the end face runout of the friction disc caused by the processing and installation errors.

[0037] 2. The ball-disc grinding pair structure of the present invention uses linear bearings in the loading components to ensure that the ball-disc grinding pair is not subjected to radial vibration caused by tangential force during loading, and uses damping spring sheets to absorb tiny axial vibrations caused by friction, thereby reducing load fluctuations at the contact position of the grinding pair and ensuring stable loading of the ball-disc grinding pair.

[0038] 3. The ball-disc grinding pair structure of the present invention is provided with an electric wire for realizing electrical connection between the test piece and the power supply, and is provided with a carbon brush in contact with the outer edge of the friction disk. The insulating fixture and the test piece are insulated and connected, and a conductive circuit is formed by the electric wire and the carbon brush, which ensures that the current only flows between the power supply, the carbon brush, the friction disk and the test piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the overall structure of the ball-disc grinding pair structure of the present invention;

[0040] Figure 2a is a schematic diagram of the three-dimensional structure of the loading component;

[0041] Figure 2b It is a schematic diagram of the partial enlarged structure of the loading component;

[0042] Figure 3a It is a three-dimensional structural schematic diagram of the transfer component;

[0043] Figure 3b A cross-sectional view of the main shaft.

[0044] Figure numerals: 1-vibration isolation platform; 100-loading component; 200-transposition component; 101-load support; 102-linear module; 103-first motor; 104-linear displacement slide; 105-wedge support block; 106-horizontal slide; 107-pad; 108-three-dimensional force sensor; 109-clamp base; 110-linear bearing; 111-insulating clamp; 112-vibration damping spring sheet; 113-linear bearing seat; 114-mandrel; 115-test piece; 116-bearing mounting plate; 117-electric conductor; 201-second motor; 202-rotating table; 203-adjusting platform; 204 -leveling knob; 205-turntable column; 206-sapphire plate; 207-flexible pressure cover; 208-fixed short shaft; 209-locking nut; 210-upper triangle plate; 211-third motor; 212-carbon brush; 313-spindle; 214-friction plate; 215-lower triangle plate; 216-rigid pressure cover; 217-rigid gasket; 218-insulating gasket; 219-shoulder pin; 220-insulating flange; 221-double locking nut; 222-double angular contact ball bearing; 223-turntable base; 224-angular contact ball bearing; 225-driven pulley; 226-bearing end cover; 227-retaining ring. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] In view of the fact that it is difficult to achieve stable loading between the paired pairs due to the influence of motor vibration and environmental vibration in the existing friction and wear test bench, the ball-disc grinding paired pair structure of the present invention has been designed to stably load the loading component 100, and the linear bearing 110 is used to isolate the radial movement of the test piece 115 so that the test piece 115 can only move up and down axially in the linear bearing 110, which fundamentally eliminates the jumping of the test piece 115 along the contact plane during the friction process. The design of the vibration isolation spring sheet allows the test piece 115 to have a certain degree of freedom in the axial direction, which can eliminate the load fluctuation caused by the unevenness of the friction disc 214, so that the paired pair can achieve stable loading. The transfer component 200 levels the friction disc 214 through the adjustment platform 203 and multiple shoulder pins 219, which to a certain extent eliminates the end face jumping of the friction disc 214 caused by processing and installation errors.

[0047] Embodiment 1

[0048] This embodiment provides a ball-disc grinding pair structure with stable loading, such as Figure 1 As shown in the structure, the ball-disc grinding pair structure includes a vibration isolation platform 1, a loading component 100, a transfer component 200 and a control unit; the vibration isolation platform 1 is located at the bottom of the loading component 100 and the transfer component 200; the loading component 100 and the transfer component 200 are both fixedly mounted on the vibration isolation platform 1 by bolts;

[0049] like Figure 2a and Figure 2bAs shown, the loading component 100 is used to achieve stable loading of force load and electrical load, and includes a load support 101, a linear module 102, a first motor 103, a linear displacement slide 104, an inclined wedge support block 105, a horizontal slide 106, a pad 107, a three-dimensional force sensor 108, a fixture base 109, a linear bearing 110, an insulating fixture 111, a vibration-damping spring sheet 112, a linear bearing seat 113, a core shaft 114, a bearing mounting plate 116 and an electrical conductor 117; the bottom end of the load support 101 is fixedly connected to the top surface of the vibration isolation platform 1; two load supports 101 arranged in parallel are fixedly installed on the top surface of the vibration isolation platform 1. The linear module 102 is fixedly installed on the load support 101; the linear displacement slide 104 can be installed on the linear module 102 in a reciprocating manner along the vertical direction; the first motor 103 is used to drive the linear displacement slide 104 to reciprocate along the linear module 102; the linear module 102 can use a screw nut or a gear rack to realize the conversion between rotational motion and linear reciprocating motion, and the first motor 103 drives the gear or screw to rotate, thereby driving the rack or nut to move up and down; the inclined wedge support block 105 is fixedly installed on the top of the linear displacement slide 104; the inclined wedge support block 105, the horizontal slide 106, the pad 107, the three-dimensional force sensor 108, the fixture base 109 and the bearing installation The mounting plate 116 is fixedly connected from bottom to top; the insulating clamp 111 is used to fix the test piece 115; the horizontal slide 106 is used to adjust the position of the test piece 115 in the horizontal plane in the lateral and longitudinal directions; the linear bearing 110 is connected to the bearing mounting plate 116 by threads; the mandrel 114 passes through the linear bearing 110, the top end is connected to the insulating clamp 111 by threads, and the bottom end is connected to the linear bearing seat 113 by pins; the insulating clamp 111 is used to fix the test piece 115; the damping spring sheet 112 is fixedly installed in the clamp base 109; in this embodiment, the axial loading force is 5N, and the damping spring sheet 112 is made of soft steel material with a thickness of 0.1mm. The damping spring sheet 112 adopts an upper and lower double-layer structure, and a rigid pad is fixedly connected between the two layers. When studying the influence of large load on friction and wear, a harder damping spring sheet 112 can be used, or the single-layer damping spring sheet 112 can be replaced with an upper and lower double-layer damping spring sheet, and a rigid pad can be used to separate the edges between the two layers of damping spring sheets 112, in order to isolate the energy absorption and loading effects of the damping spring sheet 112, and enhance the stable loading capacity of the loading component 100 under large loads. The linear bearing seat 113 is fixedly mounted on the top surface of the damping spring sheet 112; one end of the electric wire 117 can be fixedly mounted on the insulating fixture 111; the electric wire 117 passes through the core shaft 114 and the damping spring sheet 112 and is led out from the side of the fixture base 109 to realize the electrical connection between the test piece 115 and the power supply. The load support 101 can be a right-angled triangle structure, wherein one right-angled side of the right-angled triangle is fixedly mounted on the top surface of the vibration isolation platform 1, and the other right-angled side is used to fix the linear module 102.The load support 101 and the vibration isolation platform 1, the load support 101 and the linear module 102, the linear displacement slide 104 and the linear module 102, the wedge support block 105 and the linear displacement slide 104, the horizontal slide 106 and the wedge support block 105 and the pad 107, the pad 107 and the three-dimensional force sensor 108, and the three-dimensional force sensor 108 and the fixture base 109 can all be connected by bolts.

[0050] like Figure 3a and Figure 3bAs shown, the indexing component 200 is used to drive the friction disk 214 to switch between the initial state and the friction state; when the friction disk 214 is in the friction state, the friction disk 214 contacts the test piece 115; when the friction disk 214 is in the initial state, the friction disk 214 is separated from the test piece 115; the indexing component 200 includes a second motor 201, a rotating table 202, an adjusting platform 203, a rotating table column 205, a sapphire disk 206, a fixed short shaft 208, an upper triangular plate 210, a third motor 211, a carbon brush 212, a main shaft 213, a friction disk 214, a lower triangular plate 215, a rigid pressure cover 216, a rigid gasket 217, and an insulating gasket 218 , shoulder pin 219, insulating flange 220 and double locking nut 221; the rotating table 202 can be rotatably mounted on the top surface of the vibration isolation platform 1; the second motor 201 is used to drive the rotating table 202 to rotate; a worm gear transmission mechanism or a gear transmission mechanism is connected between the second motor 201 and the rotating table 202; the rotating table 202, the adjusting platform 203 and the lower triangular plate 215 are fixedly connected by bolts from bottom to top in sequence; the adjusting platform 203 is provided with a leveling knob 204 for leveling the lower triangular plate 215, and the leveling of the lower triangular plate 215 is achieved by the adjusting platform 203, thereby achieving the leveling of the friction plate 214 and the sapphire plate 206.The upper triangular plate 210 is mounted on the top of the lower triangular plate 215 through six turntable columns 205, and the six turntable columns 205 are evenly distributed along the circumference of the central axis of the lower triangular plate 215; the fixed short shaft 208 is arranged in the vertical direction and fixedly mounted on the top of the upper triangular plate 210; the sapphire disk 206 is fixedly mounted on the fixed short shaft 208 through the flexible pressure cover 207 and the locking nut 209, and the wear process is conveniently observed through the friction between the sapphire disk 206 and the test piece 115; the main shaft 213 is arranged parallel to the fixed short shaft 208 and can be rotatably mounted on the upper triangular plate 210 and the lower triangular plate 215; the friction disk 214 is located on the top of the upper triangular plate 210 and is coaxially insulated and fixedly mounted on the main shaft 213; the third motor 211 is fixedly mounted on the center of the upper triangular plate 210, and is used to drive the main shaft 213 to rotate; the carbon brush 212 is fixedly mounted on the upper triangular plate through a carbon brush bracket made of insulating material The top of the main shaft 210 is in contact with the outer edge of the friction plate 214, so that the carbon brush 212 is insulated from the upper triangular plate 210; the rigid gland 216, the rigid gasket 217, the insulating gasket 218, the shoulder pin 219, the insulating flange 220 and the double locking nut 221 are located on the upper side of the upper triangular plate 210; the rigid gasket 217, the insulating flange 220, the insulating gasket 218 and the rigid gland 216 are sequentially mounted from bottom to top along the axial direction of the main shaft 213. The rigid gland 216 is pressed by a double locking nut 221 threadedly connected to the main shaft 213; a plurality of shoulder pins 219 are evenly distributed along the circumference of the main shaft 213, and the shoulder pins 219 pass through the rigid gland 216, the insulating gasket 218 and the insulating flange 220 in sequence and are fixedly connected to the rigid gasket 217, so as to embed the friction disc 214 between the insulating gasket 218 and the insulating flange 220 along the axial direction of the main shaft 213. The main shaft 213 is provided with a shoulder located on the upper side of the upper triangular plate 210; the bottom end surface of the rigid gasket 217 abuts against the shoulder, and the bottom end of the rigid gasket 217 is supported and limited by the shoulder.

[0051] The control unit is connected to the three-dimensional force sensor 108, the first motor 103, the second motor 201 and the third motor 211 for controlling the first motor 103, the second motor 201 and the third motor 211 to load the test piece 115 and switch the state of the friction disk 214. The control unit may be a computer.

[0052] The above-mentioned indexing component 200 also includes a double angular contact ball bearing 222, a bearing end cover 226, a retaining ring 227, an angular contact ball bearing 224, a rotating table base 223, a flexible pressure cover 207, a locking nut 209 and a transmission mechanism; the main shaft 213 is supported on the upper triangular plate 210 through the double angular contact ball bearing 222, and is supported on the lower triangular plate 215 through the angular contact ball bearing 224; the double angular contact ball bearing 222 is installed on the upper triangular plate 210 through the bearing end cover 226 and the retaining ring 227. The rotating table base 223 is fixedly installed on the vibration isolation platform 1 by bolts; the second motor 201 and the rotating table 202 are fixedly installed on the rotating table base 223; the top of the fixed short shaft 208 is threadedly connected with a locking nut 209; the locking nut 209 presses the sapphire disk 206 through the flexible pressure cover 207; the output end of the third motor 211 is fixedly connected with a reducer, and the reducer is fixedly installed on the upper triangular plate 210; the output shaft of the reducer is connected to the main shaft 213 through a transmission mechanism; the transmission mechanism is a belt transmission mechanism, It also includes a driving pulley, a driven pulley 225 and a belt; the driving pulley is fixedly installed on the output shaft of the reducer; the driven pulley 225 is fixedly installed on the main shaft 213; the driving pulley and the output shaft of the reducer, as well as the driven pulley 225 and the main shaft 213 can be connected by a key; the belt is installed between the driving pulley and the driven pulley 225, and the power of the third motor 211 is transmitted to the main shaft 213 through the belt, the driving pulley and the driven pulley 225, thereby realizing the rotation of the friction disk 214.

[0053] The above-mentioned ball-disc grinding pair structure is provided with an adjustment platform 203 on the rotating table 202 in the indexing component 200. The adjustment platform 203 can be used to level the friction disk 214, which eliminates the end face runout caused by the coaxiality error between the friction disk 214 and the main shaft 213 during the processing and installation process to a certain extent, creating the prerequisite for achieving stable loading of the ball-disc pair. At the same time, the friction disk 214 can also be leveled by the shoulder pin 219, further reducing the end face runout of the friction disk 214 caused by processing and installation errors. The linear bearing 110 is used in the loading component 100 to ensure that the ball-disc pair is not subjected to radial vibration caused by the tangential force during the loading process, and the damping spring sheet 112 is used to absorb the small axial vibration caused by friction, which can reduce the load fluctuation at the contact position of the pair and ensure the stable loading of the ball-disc pair.

[0054] The above-mentioned ball-disc grinding pair structure is provided with an electric conductor 117 for realizing electrical connection between the test piece 115 and the power supply, and is provided with a carbon brush 212 that contacts the outer edge of the friction disc 214. The insulating clamp 111 and the test piece 115 are insulated and connected, and a conductive circuit is formed by the electric conductor 117 and the carbon brush 212, which ensures that the current only flows between the power supply, the carbon brush 212, the friction disc 214 and the test piece 115.

[0055] Embodiment 2

[0056] The embodiment of the present invention further provides a test method for the above-mentioned ball-disc grinding pair structure, and the test method comprises the following steps:

[0057] The control unit controls the second motor 201 to drive the rotating table 202 to rotate so that the friction disk 214 rotates to the position directly above the test piece 115;

[0058] The control unit controls the third motor 211 to drive the friction disk 214 to rotate;

[0059] The control unit controls the first motor 103 to drive the linear module 102 to move the test piece 115 upward. When the test piece 115 contacts the friction disk 214, it is continuously loaded, and the load signal detected by the three-dimensional force sensor 108 determines whether the current load reaches the specified load, and controls the first motor 103 to lock the brake when the specified load is reached. During this process, due to the roughness and slight wear of the friction disk 214 and the test piece 115, there is a very small range of up and down fluctuations in the contact position, which will be transmitted to the damping spring sheet 112 through the core shaft 114 and eliminated. When severe wear causes large up and down fluctuations in the contact position, a command signal is sent to the first motor 103 through the feedback loop of the control unit to drive the test piece 115 to move slightly up and down to eliminate the severe fluctuations and achieve a stable load.

[0060] When the friction and wear test reaches a predetermined time, the control unit controls the first motor 103 to drive the test piece 115 to descend to a specified height, so that the test piece 115 is out of contact with the friction disk 214; the control unit controls the third motor 211 to stop rotating; at this time, the control unit can send a command signal to the second motor 201 to drive the rotating table 202 to rotate and rotate the sapphire disk 206 to the top of the test piece 115, so as to prepare for the next observation.

[0061] In the above test method, when electrical factors are considered, when the control unit controls the first motor 103 to drive the linear module 102 to move the test piece 115 upward, the carbon brush 212 and the electrical conductor 117 are respectively connected to the two poles of the power supply, so that the current only passes through the friction disk 214 and the test piece 115.

[0062] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A ball-disc grinding pair structure with stable loading, characterized in that: It includes a vibration isolation platform, a loading component, a transfer component and a control unit; The loading component is used to achieve stable loading of force load and electric load, and includes a load support, a linear module, a first motor, a linear displacement slide, an inclined wedge support block, a horizontal slide, a pad, a three-dimensional force sensor, a fixture base, a linear bearing, an insulating fixture, a vibration-damping spring sheet, a linear bearing seat, a core shaft, a bearing mounting plate and an electrical conductor; the bottom end of the load support is fixedly connected to the top surface of the vibration isolation platform; the linear module is fixedly installed on the load support; The linear displacement slide can be installed on the linear module in a reciprocating and sliding manner in a vertical direction; the first motor is used to drive the linear displacement slide to reciprocate along the linear module; the inclined wedge support block is fixedly installed on the top of the linear displacement slide; the inclined wedge support block, the horizontal slide, the pad, the three-dimensional force sensor, the fixture base and the bearing mounting plate are fixedly connected in sequence from bottom to top; the insulating fixture is used to fix the test piece; the linear bearing is connected to the bearing mounting plate by threads; the core shaft passes through the linear bearing, the top end is connected to the insulating fixture by threads, and the bottom end is connected to the linear bearing seat by pins; the damping spring sheet is fixedly installed in the fixture base; the linear bearing seat is fixedly installed on the top surface of the damping spring sheet; the electrical wire passes through the core shaft and the damping spring sheet and is led out from the side of the fixture base to realize the electrical connection between the test piece and the power supply; The indexing component is used to drive the friction disc to switch between the initial state and the friction state; When the friction disc is in a friction state, the friction disc is in contact with the test piece; When the friction disc is in the initial state, the friction disc is separated from the test piece; the indexing component includes a second motor, a rotating table, an adjusting platform, a rotating table column, a sapphire disc, a fixed short shaft, an upper triangular plate, a third motor, a carbon brush, a main shaft, a friction disc and a lower triangular plate; the rotating table can be rotatably mounted on the top surface of the vibration isolation platform; The second motor is used to drive the rotating table to rotate; the rotating table, the adjusting platform and the lower triangular plate are fixedly connected in sequence from bottom to top; the upper triangular plate is installed on the top of the lower triangular plate through the six turntable columns; the fixed short shaft is arranged in the vertical direction and fixedly installed on the top of the upper triangular plate; the sapphire plate is fixedly installed on the fixed short shaft; the main shaft is arranged parallel to the fixed short shaft and can be rotatably installed on the upper triangular plate and the lower triangular plate; the friction plate is located on the top of the upper triangular plate and is coaxially and insulatedly fixedly installed on the main shaft; the third motor is fixedly installed on the upper triangular plate and is used to drive the main shaft to rotate; the carbon brush is insulated and fixedly installed on the top of the upper triangular plate and contacts the outer edge of the friction plate; The control unit is connected to the three-dimensional force sensor, the first motor, the second motor and the third motor signals, and is used to control the first motor, the second motor and the third motor to load the test piece and switch the state of the friction disk.

2. The ball-disc grinding pair structure according to claim 1, characterized in that: The indexing component also includes a rigid gland, a rigid gasket, an insulating gasket, a shoulder pin, an insulating flange and a double locking nut located on the upper side of the upper triangular plate; The rigid gasket, the insulating flange, the insulating gasket and the rigid gland are sequentially mounted from bottom to top along the axial direction of the main shaft, and the rigid gland is compressed by the double locking nut threadedly connected to the main shaft; There are multiple shoulder pins evenly distributed along the circumference of the main shaft. The shoulder pins pass through the rigid pressure cover, the insulating gasket and the insulating flange in sequence and are fixedly connected to the rigid gasket, so as to embed the friction disk between the insulating gasket and the insulating flange along the axial direction of the main shaft.

3. The ball-disc grinding pair structure according to claim 2, characterized in that: The indexing component also includes a double angular contact ball bearing, a bearing end cover, a snap ring and an angular contact ball bearing; The main shaft is supported by the upper triangular plate through the double angular contact ball bearings, and is supported by the lower triangular plate through the angular contact ball bearings; The double angular contact ball bearing is mounted on the upper triangular plate through the bearing end cover and the retaining ring.

4. The ball-disc grinding pair structure according to claim 3, characterized in that: The main shaft is provided with a shoulder located on the upper side of the upper triangular plate; the bottom end surface of the rigid gasket abuts against the shoulder.

5. The ball-disc grinding pair structure according to claim 4, characterized in that: The indexing component also includes a rotating table base, a flexible gland, a locking nut and a transmission mechanism; The rotating table base is fixedly mounted on the vibration isolation platform; the second motor and the rotating table are fixedly mounted on the rotating table base; a worm gear transmission mechanism is transmission-connected between the second motor and the rotating table; the top end of the fixed short shaft is threadedly connected with the locking nut; The locking nut presses the sapphire disk through the flexible gland; the output end of the third motor is fixedly connected to a reducer, and the reducer is fixedly mounted on the upper triangular plate; the output shaft of the reducer is transmission-connected to the main shaft through the transmission mechanism; The carbon brush is mounted on the upper triangular plate through a carbon brush bracket.

6. The ball-disc grinding pair structure according to claim 5, characterized in that: The transmission mechanism is a belt transmission mechanism, and includes a driving pulley, a driven pulley and a belt; The driving pulley is fixedly mounted on the output shaft of the reducer; The driven pulley is fixedly mounted on the main shaft; The belt is installed between the driving pulley and the driven pulley.

7. The ball-disc grinding pair structure according to any one of claims 1 to 6, characterized in that: The vibration-damping spring sheet is made of a soft steel material with a thickness of 0.1 mm.

8. The ball-disc grinding pair structure according to any one of claims 1 to 6, characterized in that: The vibration-damping spring sheet adopts an upper and lower double-layer structure, and a rigid pad is fixedly connected between the two layers.

9. A test method for a ball-on-disk grinding pair structure as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: The second motor drives the rotating table to rotate so that the friction disk rotates to the position directly above the test piece; The friction disc is driven to rotate by a third motor; The linear module is driven by the first motor to move the test piece upward. When the test piece contacts the friction disk, the load is continuously applied. The load signal detected by the three-dimensional force sensor is used to determine whether the current load reaches the specified load. When the specified load is reached, the first motor brake is controlled to lock. When the friction and wear test reaches a predetermined time, the first motor drives the test piece to descend to a specified height so that the test piece is out of contact with the friction disk; and the third motor is controlled to stop rotating.

10. The test method according to claim 9, characterized in that When the test piece is driven upward by the first motor to drive the linear module, the carbon brush and the electric wire are connected to the two poles of the power supply respectively, so that the current only passes through the friction disk and the test piece.

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