A vortex friction testing machine

Abstract

The invention discloses a vortex friction tester in the field of friction test, including a frame, a variable frequency motor is fixed on the frame, an output shaft of which is longitudinally arranged front and back and connected to a driving shaft, the driving shaft is rotatably fixed on a box body and at least one circular test piece is fixed at the end; a flat test piece and a loading device are arranged on the lateral side of the circular test piece in sequence, the loading device is fixed on the box body and provides a lateral loading force perpendicular to the axial direction of the driving shaft to the flat test piece, and a loading force sensor is arranged in the loading device; the flat test piece reciprocates up and down through friction with the circular test piece, and the flat test piece is connected to the friction force measuring device, the friction force measuring device is provided with a friction force sensor, and the variable frequency motor, the loading force sensor and the friction force sensor are all connected to a computer. The invention can examine the changes of metal samples under different rotation speeds and loading loads, detect their comprehensive mechanical properties, and has the characteristics of a wide test range and convenient equipment operation.

Description

Technical Field

[0001] The invention relates to the field of friction testing, in particular to a vortex friction testing machine. Background Art

[0002] Scroll compressors have the advantages of high efficiency, low vibration, low noise and reliable operation. However, due to the unique operation mode of scroll compressors, there are many friction pairs. The friction power consumption increases the input power of the compressor, reduces the efficiency, and even causes compressor accidents due to friction and wear. Therefore, it is very necessary to explore the friction performance of the scroll disk of the scroll compressor under conditions such as dry friction, dripping lubrication and immersion lubrication.

[0003] In the actual research and development process, there are two difficulties. The first is how to simulate the movement principle of the scroll compressor, and the second is how to sample the friction force. The applicant has proposed a scroll friction tester for this purpose. Summary of the invention

[0004] The object of the present invention is to provide a vortex friction testing machine to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A vortex friction testing machine comprises a frame, a computer, and a loading device and a friction force measuring device fixed on the frame, wherein a variable frequency motor is fixed on the frame, and its output shaft is arranged longitudinally front to back and connected to a driving shaft, the driving shaft is rotatably fixed on a box body and at least one circular test piece is fixed at the end, and the variable frequency motor drives the rotation of the circular test piece; a flat test piece and a loading device are sequentially arranged on the lateral side of the circular test piece, the loading device is fixed on the box body and provides a lateral loading force perpendicular to the axial direction of the driving shaft to the flat test piece, and a loading force measuring sensor for detecting the loading force is provided in the loading device; the flat test piece reciprocates up and down through friction with the circular test piece, and the flat test piece is connected to the friction force measuring device, and a friction force measuring sensor for detecting the pressure generated by the flat test piece when the flat test piece moves up and down is provided on the friction force measuring device, and the variable frequency motor, the loading force measuring sensor and the friction force measuring sensor are all connected to the computer.

[0007] As an improved solution of the present invention, the friction force measuring device includes a guide connecting plate, a guide column, an upper box plate flange and a sensor pressure plate, the flat test piece is connected to the guide connecting plate, the bottom end of the guide column is fixedly connected to the guide connecting plate and the top end is fixedly connected to the sensor pressure plate, and passes through the upper box plate flange for a movable connection up and down, the upper box plate flange is fixed to the upper surface of the box body, and a second spring is connected between the upper box plate flange and the guide connecting plate; the friction force sensor is placed on the first sensor connecting plate, the first sensor connecting plate is arranged on the upper box plate flange, the friction force sensor is fixed to the first sensor connecting rod, and the first sensor connecting rod is connected to the sensor pressure plate.

[0008] As an improved solution of the present invention, the flat specimen is fixed on a flat specimen mounting plate, the top of the flat specimen mounting plate is fixed on a slide, the slide slides laterally on the guide rail mounting plate, and a first spring is laterally connected between the guide rail mounting plate and the side of the slide; the guide rail mounting plate is fixed to the bottom of the guide connecting plate.

[0009] As an improved solution of the present invention, a first guide rail limiting plate and a second guide rail limiting plate are respectively provided on two lateral sides of the guide rail mounting plate.

[0010] As an improved solution of the present invention, the loading device includes a loading bracket, a spring guide rod, a loading screw, a loading spring seat, and a needle guide column. The loading bracket and the needle guide column are both fixed on the box body, and the loading screw is fixed on the loading bracket; the loading spring seat and the loading force sensor are laterally located between the loading screw and the needle guide column, the spring guide rod is laterally arranged in the loading spring seat, and a disc spring is provided between the spring guide rod and the lateral inner wall of the loading spring seat; the end of the loading screw presses the spring guide rod to press the loading force sensor against the needle guide column, and the needle guide column is rotatably provided with a loading bearing at one end close to the flat test piece, and is pressed against the flat test piece mounting plate through the loading bearing.

[0011] As an improved solution of the present invention, the loading screw is axially limited on the loading bracket by a loading nut, a notch is provided on the side wall of the head end of the loading screw, a set screw for radially limiting the loading screw is fixed on the loading bracket, the bottom end of the set screw passes through the notch, and the loading screw fixing block is pressed against the inner wall of the notch.

[0012] As an improved solution of the present invention, the loading bracket is further provided with an anti-rotation device for radially limiting the loading spring seat.

[0013] As an improved solution of the present invention, the circular specimen is evenly mounted on a circular specimen fixing seat in the circumferential direction, the circular specimen fixing seat is mounted on a circular specimen mounting seat, and the circular specimen mounting seat is mounted on the driving shaft.

[0014] As an improved solution of the present invention, the output shaft of the variable frequency motor is coaxially connected to the drive shaft through a plum blossom-type elastic coupling, and both ends of the drive shaft are rotatably fixed to the box body through cylindrical roller bearings.

[0015] As an improved solution of the present invention, an intermediate plate is arranged in the middle of the box body, and coaxial through holes are arranged on the intermediate plate and the rear side wall of the box body, and the front end and the rear end of the driving shaft are respectively connected to the through holes through cylindrical roller bearings.

[0016] Beneficial effects: The present invention uses a loading device to provide loading force to the flat specimen and the circular specimen, and drives the rotation of the circular specimen through a variable frequency motor, so that the circular specimen and the flat specimen have intermittent friction. Driven by the friction force, the flat specimen floats up and down at a high frequency and continuously presses against the friction force sensor, so that the friction force sensor obtains accurate measurement results. The present invention can examine the changes of metal samples under different rotation speeds and loading loads, detect their comprehensive mechanical properties, and has the characteristics of a wide test range and convenient equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a partial cross-sectional view of the front structure of the present invention;

[0018] Figure 2 It is a partial cross-sectional view of the left side structure of the present invention;

[0019] Figure 3 It is a schematic diagram of the three-dimensional structure of the present invention;

[0020] Figure 4 It is a schematic diagram of a certain angle of the bottom of the loading device of the present invention;

[0021] Figure 5 It is a schematic diagram of the head of the loading screw of the present invention.

[0022] In the figure: 1-frame; 2-box; 3-frequency conversion motor; 4-coupling; 5-drive shaft; 6-oil throwing tray; 7-round specimen mounting seat; 8-round specimen fixing seat; 9-shaft end cover; 10-round specimen; 11-flat specimen; 12-flat specimen mounting plate; 13-specimen baffle; 14-slide; 16-guide rail mounting plate; 17-first guide rail limit plate; 18-second guide rail limit plate; 19-first spring; 20-guide connecting plate; 21-guide column; 22-embedded linear bearing; 23-sensor pressure plate; 24-upper box plate flange; 25-second spring; 26-first sensor connecting plate; 27-friction force sensor; 28 -first sensor connecting rod; 29-loading bearing; 30-loading bearing support shaft; 31-loading bearing frame; 32-needle guide column; 33-loading component fixing plate; 34-loading component side plate; 35-loading nut plate; 36-loading screw; 37-loading nut; 38-spring guide rod; 39-loading spring seat; 40-disc spring; 41-second sensor connecting plate; 42-loading force sensor; 43-second sensor connecting rod; 44-upper box plate; 45-stopper; 46-spring limiting round nut; 47-loading screw fixing block; 48-spring seat anti-rotation block; 49-spring seat anti-rotation groove plate; 50-oil cup; 51-slot. DETAILED DESCRIPTION

[0023] 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.

[0024] Example 1, see Figure 1-2 A vortex friction tester includes a frame 1, a computer, and a loading device and a friction force measuring device fixed on the frame 1. A variable frequency motor 3 is fixed on the frame 1. The variable frequency motor 3 is a three-phase asynchronous variable frequency motor that can achieve variable speed. Its output shaft is arranged longitudinally front and back and connected to a drive shaft 5 through a coupling 4. Preferably, the coupling 4 is a plum blossom type elastic coupling, and the model can be selected as EC28, which can maintain a high coaxiality between the output shaft of the variable frequency motor 3 and the drive shaft 5.

[0025] The housing 2 is fixed on the frame 1, and the drive shaft 5 rotates in the housing 2. When the variable frequency motor 3 drives the drive shaft 5 to operate, the drive shaft 5 is prone to shaking, which affects the test accuracy. Therefore, an intermediate plate is set in the middle of the housing 2, and a through hole with consistent coaxiality is provided on the intermediate plate and the rear side wall of the housing 2. The front end and the end of the drive shaft 5 are respectively connected with the through hole through a high-precision cylindrical roller bearing. A shaft end cover plate 9 is also installed on the intermediate plate. The shaft end cover plate 9 is fixed on the intermediate plate to press the outer ring of the cylindrical roller bearing. The drive shaft 5 passes through the inner hole of the cylindrical roller bearing and presses on the inner ring of the cylindrical roller bearing. The drive shaft 5 rotates in cooperation with the cylindrical roller bearing. A hole is opened in the middle of the shaft end cover plate 9, and the drive shaft 5 extends through the hole. The use of a through hole with high coaxiality, a high-precision cylindrical roller bearing and a plum blossom-type elastic coupling can make the drive shaft highly accurate in rotation and almost free of radial jump, so as to facilitate high-precision testing.

[0026] The front end of the driving shaft 5 is connected to the output shaft of the variable frequency motor 3, and then passes through the side wall and the middle plate of the box body 2. The round test piece mounting seat 7 is fixed on the end surface of the end, and the round test piece fixing seat 8 is installed on the front side of the round test piece mounting seat 7 by screws. The round test piece mounting seat 7 and the round test piece fixing seat 8 rotate with the driving shaft 5 through keys. An oil slinger 6 is also provided between the front end and the end of the driving shaft 5 for lubrication when the driving shaft 5 rotates. The upper surface of the box body 2 is called the upper box plate 44, and the oil cup 50 is connected to the upper box plate by threads.

[0027] At least one circular test piece 10 is evenly mounted on the circular test piece fixing seat 8 in the circumferential direction, usually 1, 2 or 4 are selected, and the variable frequency motor 3 drives the rotation of the circular test piece 10. A flat test piece 11 and a loading device are sequentially arranged on the lateral side of the circular test piece 10. The loading device is fixed on the box body 2 and provides a lateral loading force perpendicular to the axial direction of the driving shaft 5 to the flat test piece 11. The loading device is provided with a loading force sensor 42 for detecting the loading force.

[0028] The loading device provides a loading force to the flat specimen 11, so that the flat specimen 11 and the circular specimen 10 are in contact with each other. When the circular specimen 10 is driven by the variable frequency motor 3 to rotate at high frequency, the flat specimen 11 and the circular specimen 10 are in contact and friction. This embodiment uses the compression-slip contact friction form in which the circular specimen rotates and the flat specimen is stationary, simplifies the structure of the scroll disk, retains the characteristics of dynamic line contact (transient) of non-fixed points and the formation of fluid dynamic pressure (non-contact dynamic load, fatigue under high stress) in the meshing area, and can simulate the motion principle of the scroll compressor for testing.

[0029] The flat test piece 11 reciprocates up and down due to friction with the circular test piece 10. Specifically, it floats slightly up and down, and the flat test piece 11 is connected to a friction force measuring device. The friction force measuring device is provided with a friction force sensor 27 for detecting the pressure generated by the flat test piece 11 when it moves up and down. The variable frequency motor 3, the loading force sensor 42 and the friction force sensor 27 are all connected to a computer.

[0030] Another difficulty of the vortex friction tester is how to detect the friction force generated between the flat test piece 11 and the round test piece 10 under high-frequency motion. This embodiment utilizes the up and down floating of the flat test piece 11 and the round test piece 10 when they rub against each other, and converts it into high-frequency pressure on the friction force sensor 27, so that the friction force sensor 27 can obtain accurate detection results and display them through a computer.

[0031] As an optional embodiment, the friction force measuring device includes a guide connecting plate 20, a guide column 21, an upper box plate flange 24 and a sensor pressure plate 23. The flat test piece 11 is fixed to the flat test piece mounting plate 12 by screws. Preferably, as Figure 3 As shown, specimen baffles 13 for limiting the position of the flat specimen 11 are installed on both longitudinal sides of the flat specimen mounting plate 12 .

[0032] The top of the flat specimen mounting plate 12 is fixed to the slide 14 by screws, and the slide 14 slides transversely on the guide rail mounting plate 16. The bottom of the guide rail mounting plate 16 is provided with two transversely arranged linear guide rails for slidingly connecting with the slide 14. The first guide rail limiting plate 17 and the second guide rail limiting plate 18 are respectively provided on the transverse sides of the guide rail mounting plate 16, which are used to limit the transverse sides of the slide 14, wherein the first spring 19 is transversely connected between the second guide rail limiting plate 18 and the opposite side of the slide 14, and the first spring 19 adopts a cylindrical helical compression spring.

[0033] In the gap where there is no friction between the flat specimen 11 and the round specimen 10, the flat specimen 11 will slightly shake in the left and right lateral directions, thereby driving the flat specimen mounting plate 12 to slide horizontally on the guide rail mounting plate 16 through the slide 14. When sliding to the right, the first spring 19 rebounds after being compressed in the horizontal direction, limiting the flat specimen 11. The first spring 19 can ensure that the flat specimen mounting plate 12 adjusts its position in the loading direction.

[0034] The guide rail mounting plate 16 is fixed to the bottom of the guide connecting plate 20 by screws. The bottom end of the guide column 21 is fixedly connected to the guide connecting plate 20 and the top end is fixedly connected to the sensor pressure plate 23. The guide column 21 passes through the upper box plate flange 24 through the embedded linear bearing 22. The embedded linear bearing 22 is placed on the upper box plate flange 24. The upper surface of the upper box plate flange 24 is provided with a circular groove corresponding to the bottom end of the embedded linear bearing 22. The upper box plate flange 24 is fixed to the upper box plate 44, and a second spring 25 is connected between the upper box plate flange 24 and the guide connecting plate 20. The second spring 25 is also a cylindrical helical compression spring.

[0035] The friction force sensor 27 is placed on the first sensor connecting plate 26 , the first sensor connecting plate 26 is arranged on the upper box plate flange 24 , the friction force sensor 27 is fixed to the first sensor connecting rod 28 , and the first sensor connecting rod 28 is connected to the sensor pressure plate 23 .

[0036] The friction force measuring device has a deadweight, which is applied by the sensor pressure plate 23 in contact with the first sensor connecting rod 28, and the deadweight is detected by the friction force measuring sensor 27 as the initial value. When the circular specimen 10 rotates, according to the direction of rotation of the circular specimen 10, there is an upward or downward friction force at the contact point between the circular specimen 10 and the flat specimen 11, and the friction force causes the flat specimen 11 to float slightly up and down. Since the flat specimen 11 is fixed on the flat specimen mounting plate 12, the flat specimen mounting plate 12, the guide rail mounting plate 16, the guide connecting plate 20, etc. are driven to float up and down at a high frequency through the guide column 21. When the friction force is upward, the detection value of the friction force measuring sensor 27 decreases from the initial value, and when the friction force is downward, the detection value increases. The difference between the detection value and the initial value is the friction value between the flat specimen 11 and the circular specimen 10.

[0037] The second spring 25 ensures that the friction and force measuring device can adjust its position in the vertical direction. The guide column 21 is connected to the embedded linear bearing 22, and after ensuring the coaxiality and verticality, the parallelism of the linear guide rail and the loading axis can be ensured.

[0038] As an optional embodiment, the loading device includes a loading bracket, a spring guide rod 38, a loading screw 36, a loading spring seat 39, and a needle guide column 32. The loading bracket includes a loading component fixing plate 33 fixed on the side wall of the box body 2, two loading component side plates 34 fixed on both sides of the loading component fixing plate 33 in the longitudinal direction, and a loading nut plate 35 fixed on the end of the loading component side plate 34. The loading component fixing plate 33, the loading nut plate 35 and the two loading component side plates 34 form a frame structure.

[0039] The needle guide post 32 is fixed on the side wall of the box body 2, the loading spring seat 39 and the loading force sensor 42 are distributed laterally and are located in the loading bracket between the loading screw 36 and the needle guide post 32, and a stopper 45 is connected between the upper surfaces of the two loading component side plates 34, which is used to limit the right end face of the loading spring seat 39 to prevent the loading spring seat 39 from moving to the right. The spring guide rod 38 is arranged laterally in the loading spring seat 39, and one end thereof passes through the left end portion of the loading spring seat 39 and abuts against the end of the loading screw 36. The loading screw 36 passes through the loading nut plate 35 and is fixed by the loading nut 37. The loading nut 37 is used to axially limit the loading screw 36. Preferably, in order to prevent the loading screw 6 from rotating, the loading screw 6 needs to be in stable contact with the spring guide rod 38, such as Figure 5 As shown, a slot 51 is provided on the side wall of the head end of the loading screw 36 , and a set screw for radially limiting the loading screw 36 is fixed on the loading bracket. The bottom end of the set screw passes through the slot 51 and presses the loading screw fixing block 47 against the side wall of the screw of the loading screw 36 .

[0040] A disc spring 40 is arranged outside the spring guide rod 38, a circle of convex bodies is arranged on the left outer wall of the spring guide rod 38, a threaded hole is arranged on the left wall of the loading spring seat 39, the left end of the spring guide rod 38 passes through the threaded hole and abuts against the end of the loading screw 36, a spring limiting round nut 46 is threadedly connected in the threaded hole, the spring limiting round nut 46 is spirally rotated, and the disc spring 40 is located between the convex body and the right inner wall of the loading spring seat 39 and is in a compressed state. Preferably, in order to prevent the spring limiting round nut 46 from loosening, a screw hole is tapped on the circumferential side wall of the loading spring seat 39, and a screw is screwed into the screw hole to radially limit the spring limiting round nut 46.

[0041] The loading spring seat 39 is fixed to the second sensor connecting plate 41 by screws, the second sensor connecting plate 41 is connected to the loading force sensor 42 by screws, the second sensor connecting rod 43 is connected to the loading force sensor 42 by threads, and the top end of the second sensor connecting rod 43 is pressed against the middle shaft of the needle guide column 32. The right end of the needle guide column 32 is installed with a loading bearing frame 31 by screws, and a longitudinally arranged loading bearing support shaft 30 is fixed on the loading bearing frame 31, and a loading bearing 39 is rotatably fixed on the loading bearing support shaft 30.

[0042] Preferably, in order to prevent the rotation of the loading spring seat 39, an anti-rotation device for radially limiting the loading spring seat 39 is also provided on the loading bracket. Figure 4As shown, specifically, a spring seat anti-rotation slot plate 49 is fixedly connected between the bottom surfaces of the two longitudinal loading assembly side plates 34 by screws, and a plurality of bolt holes, preferably two, are provided on the spring seat anti-rotation slot plate 49, and bolts are threadedly connected in the bolt holes. The ends of the bolts pass through the side walls of the loading spring seat 39 and are located inside thereof, and the heads of the bolts are jointly connected to the spring seat anti-rotation block 48 to achieve an anti-rotation effect.

[0043] By adjusting the extension length of the loading screw 36, the loading screw 36 presses the spring guide rod 38, the spring guide rod 38 presses the loading force sensor 42, the second sensor connecting rod 43 presses the needle guide column 32, and finally the needle guide column 32 presses the loading bearing 29 to the flat specimen mounting plate 12, thereby providing a horizontal loading force for the flat specimen 11. Since the flat specimen mounting plate 12 will float up and down when the flat specimen 11 and the round specimen 10 rub against each other, the loading bearing 39 connected to the loading bearing support shaft 30 is selected to rotate. During the up and down movement of the flat specimen mounting plate 12, the loading bearing 39 will rotate clockwise or counterclockwise due to the friction with the flat specimen mounting plate 12. The disc spring 40 has a small volume and a large load-bearing capacity, and has the function of low stroke and high compensation. It can provide compensation force when the round specimen 10 and the flat specimen 11 are intermittently not in contact, and prevent the loading spring seat 39 from moving right.

[0044] When implementing this embodiment, install the round test piece 10 on the round test piece fixing seat 8, and install the flat test piece 11 on the flat test piece mounting plate 12. After the round test piece 10 and the flat test piece 11 are installed, manually rotate the coupling 4 of the variable frequency motor 3 to turn one of the round test pieces 10 to the extreme position on the left side in the horizontal direction. This is the position closest to the flat test piece 11 and the position where the disc spring 40 in the loading force measuring device is subjected to the greatest force. Rotate the loading screw 36 to add the load to the set value and lock it with the set screw. Rotate the spring limit nut 46 to make it lean to the right against the convex body of the spring guide rod 38. At this time, the flat test piece 11 is subjected to the force provided by the loading device and abuts against the round test piece 10, and the slide 14 slides to the right on the guide rail mounting plate 16, and the first spring 19 is in a compressed state. The spring limiting round nut 46 is rotated 180° (i.e. the spring limiting round nut 46 is retracted 1mm), and radially locked with screws, and then the coupling 4 of the variable frequency motor 3 is manually rotated to disengage the round test piece 10 and the flat test piece 11. At this time, the second sensor connecting plate 41 moves 1mm to the right, and a gap of about 1mm is maintained between the second sensor connecting plate 41 and the stopper 45, and the loading state is completed. After the variable frequency motor 3 is running, one or more round test pieces 10 indirectly have high-frequency friction contact with the flat test piece 11. When in contact, the flat test piece 11 is pressed by the round test piece 10 and can retract in the reserved 1mm space.

[0045] The load force sensor 42 and the friction force sensor 27 in this embodiment both need to use high-precision instruments to achieve accurate measurement and display, and can accurately output time-load and time-friction relationship curves.

[0046] The dynamic specimen is cylindrical, and the static specimen is a flat specimen. During the test, 4 / 2 / 1 circular specimens and one flat specimen are used to simulate the transient line contact of non-fixed points in the motion principle of the scroll compressor, and can selectively form fluid dynamic pressure lubrication / boundary lubrication / dry friction, variable frequency speed wide range adjustable, intermittent load + intermittent contact. The cylindrical specimen is selected to be installed on the disc, which is convenient for installation and can be expanded to a common variable speed, high and low speed ring block test machine.

[0047] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0048] In the description of the present invention, it should be noted that relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0049] In the description of the present invention, it is also necessary to explain that the orientations or positional relationships indicated by the terms "upper", "lower", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0050] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent changes made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. A vortex friction testing machine, characterized in that: The invention comprises a frame (1), a computer, and a loading device and a friction force measuring device fixed on the frame (1); a variable frequency motor (3) is fixed on the frame (1); an output shaft of the variable frequency motor (3) is arranged longitudinally front to back and connected to a drive shaft (5); the drive shaft (5) is rotatably fixed on a box body (2) and at least one circular test piece (10) is fixed at the end; the variable frequency motor (3) drives the rotation of the circular test piece (10); a flat test piece (11) and a loading device are sequentially provided on one lateral side of the circular test piece (10); the loading device is fixed on the box body (2) and applies pressure to the flat test piece (11). 1) providing a lateral loading force perpendicular to the axial direction of the driving shaft (5), wherein the loading device is provided with a loading force sensor (42) for detecting the loading force; the flat test piece (11) reciprocates up and down by friction with the circular test piece (10), and the flat test piece (11) is connected to the friction force sensor, and the friction force sensor is provided on the friction force sensor (27) for detecting the pressure generated by the flat test piece (11) when the flat test piece (11) moves up and down, and the variable frequency motor (3), the loading force sensor (42) and the friction force sensor (27) are all connected to a computer; The friction force measuring device comprises a guide connecting plate (20), a guide column (21), an upper box plate flange (24) and a sensor pressure plate (23); the flat test piece (11) is connected to the guide connecting plate (20); the bottom end of the guide column (21) is fixedly connected to the guide connecting plate (20) and the top end is fixedly connected to the sensor pressure plate (23), and penetrates the upper box plate flange for vertical movability connection; the upper box plate flange (24) is fixed to the upper surface of the box body (2), and a second spring (25) is connected between the upper box plate flange (24) and the guide connecting plate (20); the friction force measuring sensor (27) is placed on the first sensor connecting plate (26), the first sensor connecting plate (26) is arranged on the upper box plate flange (24), the friction force measuring sensor (27) is fixed to the first sensor connecting rod (28), and the first sensor connecting rod (28) is connected to the sensor pressure plate (23); The loading device comprises a loading bracket, a spring guide rod (38), a loading screw (36), a loading spring seat (39), and a needle guide column (32). The loading bracket and the needle guide column (32) are both fixed to the box body (2), and the loading screw (36) is fixed to the loading bracket; the loading spring seat (39) and the loading force sensor (42) are transversely located between the loading screw (36) and the needle guide column (32); the spring guide rod (38) is transversely arranged in the loading spring seat (39), and a disc spring (40) is provided between the spring guide rod (38) and the transverse inner wall of the loading spring seat (39); the end of the loading screw (36) presses against the spring guide rod (38), so that the loading force sensor (42) presses against the needle guide column (32); a loading bearing (29) is rotatably provided at one end of the needle guide column (32) close to the flat test piece (11), and is pressed against the flat test piece mounting plate (12) through the loading bearing (29); The loading bracket comprises a loading component fixing plate (33) fixed to the side wall of the box body (2), two loading component side plates (34) fixed to the longitudinal sides of the loading component fixing plate (33), and a loading nut plate (35) fixed to the ends of the loading component side plates (34), wherein the loading component fixing plate (33), the loading nut plate (35) and the two loading component side plates (34) form a frame structure; The flat specimen (11) is fixed on a flat specimen mounting plate (12), the top end of the flat specimen mounting plate (12) is fixed on a slide table (14), the slide table (14) slides transversely on a guide rail mounting plate (16), and a first spring (19) is transversely connected between the guide rail mounting plate (16) and the side surface of the slide table (14); the guide rail mounting plate (16) is fixed to the bottom of a guide connecting plate (20); the circular specimen (10) is evenly mounted on a circular specimen fixing seat (8) in a circumferential direction, the circular specimen fixing seat (8) is mounted on a circular specimen mounting seat (7), and the circular specimen mounting seat (7) is mounted on a drive shaft (5).

2. A vortex friction testing machine according to claim 1, characterized in that: A first guide rail limiting plate (17) and a second guide rail limiting plate (18) are respectively provided on two lateral sides of the guide rail mounting plate (16).

3. A vortex friction testing machine according to claim 1, characterized in that: The loading screw (36) is axially limited on the loading bracket by a loading nut (37); a notch is provided on the side wall of the head end of the loading screw (36); a set screw for radially limiting the loading screw (36) is fixed on the loading bracket; the bottom end of the set screw penetrates into the notch and presses the loading screw fixing block against the inner wall of the notch.

4. A vortex friction testing machine according to claim 1, characterized in that: The loading bracket is also provided with an anti-rotation device for radially limiting the loading spring seat (39).

5. A vortex friction testing machine according to claim 1, characterized in that: The output shaft of the variable frequency motor (3) is coaxially connected to the drive shaft (5) via a plum blossom-shaped elastic coupling (4), and both ends of the drive shaft (5) are rotatably fixed on the box body (2) via cylindrical roller bearings.

6. A vortex friction testing machine according to claim 5, characterized in that: An intermediate plate is arranged in the middle of the box body (2), and a coaxial through hole is arranged on the intermediate plate and the rear side wall of the box body (2), and the front end and the rear end of the drive shaft (5) are respectively connected to the through hole through cylindrical roller bearings.

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