Variable-speed rotating corrosion friction testing machine

Abstract

The invention relates to a variable-speed rotating corrosion friction testing machine which comprises a testing machine rack, a lifting test platform, a lifting execution mechanism, a test seat and a carrier, the rack comprises a bottom plate, a middle plate and a top plate, and the lifting test platform is arranged on the middle plate and the top plate and moves up and down between the middle plate and the top plate based on the lifting execution mechanism; a test seat is arranged on the lifting test platform and comprises a test groove, a chassis is formed at the lower end of the test groove, the chassis is fixedly connected to the lifting test platform, a groove cover is inserted into the upper end of the test groove in a sleeving manner, a friction disc and an electrode disc which are distributed up and down are inserted into the test groove, and a disc-shaped carrier is inserted into the test groove above the friction disc; a plurality of bolt connecting holes are formed in the lower end face of the carrier. According to the friction testing machine, test pieces can be mounted at different positions of the carrier based on the positions of the screw holes in the carrier, so that the rotation radius can be controlled and adjusted, and the abrasion evaluation of the same sample at different speeds can be realized in situ.

Description

Technical field:

[0001] The invention relates to the technical field of friction and wear testing equipment, and more particularly to a variable speed rotating corrosion friction testing machine. Background technology:

[0002] Wear and corrosion are one of the most common failure forms of materials in service in the marine environment. With the in-depth implementation of the national marine strategy, it has become particularly important to evaluate the reliability and durability of moving parts of marine engineering equipment. The working conditions involved in the marine environment are complex and changeable. Accurately evaluating the performance of materials in a coupled environment of corrosion and wear (hereinafter referred to as abrasion) is the main indicator for determining the reliability of materials. For existing corrosion and friction testers, most are linear reciprocating modes or low-speed rotating structures, and some equipment cannot change the rotation radius, which makes it difficult to meet the service requirements of different speeds and variable rotation radii. At the same time, some rotating mode test benches, although they can be tested at high speeds, are prone to liquid creep and splashing. In addition, some equipment is too large to meet the needs of small and medium-sized experimental explorations. To this end, a variable-speed rotating corrosion friction and wear tester is designed to solve the above problems. Summary of the invention:

[0003] The purpose of the present invention is to address the deficiencies of the prior art and to provide a variable speed rotational corrosion friction testing machine. Based on the position of the screw holes on the carrier, the friction testing machine can install the test piece at different positions of the carrier, thereby achieving controllable and adjustable rotation radius and realizing in-situ wear evaluation of the same sample at different speeds.

[0004] A variable speed rotary corrosion friction tester comprises a frame of the tester, a lifting test platform, a lifting actuator, a test seat, a load carrier and a rotating drive mechanism. The frame comprises a bottom plate, a rectangular middle plate and a top plate are respectively arranged above the bottom plate, upper columns and lower columns are respectively fixedly connected to the upper and lower end surfaces of the four corners of the middle plate, the lower end of the lower column is fixedly connected to the bottom plate, and the upper end of the upper column is fixedly connected to the top plate. The lifting test platform is arranged on the middle plate and the top plate and moves up and down between the middle plate and the top plate based on the lifting actuator; a test seat is arranged in the middle of the lifting test platform, the test seat comprises a cylindrical test slot, a chassis is formed at the lower end of the test slot, the chassis is fixedly connected to the lifting test platform, a slot cover is inserted at the upper end of the test slot, friction discs and electrode discs distributed in upper and lower directions are inserted in the test slot, a plurality of screws are inserted in the outer ring of the friction disc, and the screws pass through the electrode disc and are screwed and fixed on the chassis;

[0005] A disc-shaped carrier is inserted in the test groove above the friction disc, and a plurality of bolt connection holes are provided on the lower end surface of the carrier; the rotary drive mechanism comprises a vertical rotary spindle, the lower end of the rotary spindle passes through the slot cover and is plugged and fixed in the middle of the carrier, and the upper end is pivotally connected to the middle of the top plate, a high-speed servo motor is fixedly connected to one side of the top plate, the rotating shaft of the high-speed servo motor extends out of the top plate sleeve and is fixedly connected to a driving gear, a driven gear is meshed on the driving gear, and the driven gear sleeve is fixed to the rotary spindle.

[0006] Preferably, the central axis of the rotating spindle, the central axis of the test tank, the central axis of the friction disk, the central axis of the electrode disk and the central axis of the carrier are on the same straight line.

[0007] Preferably, the diameter of the inner wall of the test groove is larger than the diameter of the electrode disk, the diameter of the electrode disk is equal to the diameter of the friction disk, the diameter of the friction disk is larger than the diameter of the carrier, the bolt connection holes on the lower end surface of the carrier are distributed on multiple concentric pitch circles, the center of the pitch circle is located at the central axis of the carrier, and the bolt connection holes are evenly distributed in a ring shape around the central axis of the carrier.

[0008] Preferably, both sides of the electrode disk are electrically connected with leads, the leads include a reference electrode lead and an auxiliary electrode lead, the reference electrode lead and the auxiliary electrode lead are respectively fixed to the inner walls on both sides of the test tank and a gap is provided between the reference electrode lead and the outer wall of the carrier rack; both sides of the tank cover are provided with wire holes, the reference electrode lead and the auxiliary electrode lead are respectively inserted into the wire holes of the tank cover; the test tank is an insulator.

[0009] Preferably, an annular clamping groove is formed on the outer wall of the upper end of the test groove, and an annular clamping strip is formed on the inner wall of the lower end of the groove cover, and the clamping strip is clamped in the clamping groove of the test groove;

[0010] The middle part of the slot cover is formed with an avoidance hole opposite to the rotating main shaft. The slot cover is composed of two semicircular cover bodies, and the wire holes are respectively arranged on the two cover bodies.

[0011] Preferably, two sets of opposite cover-opening mechanisms are respectively arranged on both sides of the slot cover, and the cover-opening mechanism comprises a flip arm fixedly connected to the upper end surface of the cover body and in a transverse direction, one end of the flip arm extends out of the outer side of the cover body and is formed with a boss extending upward, a transverse notch is formed in the middle of the boss, and a guide groove which is transverse and passes through the front and rear end surfaces of the boss is formed on the front and rear side walls of the notch, a longitudinal guide shaft is inserted in the guide groove, and flip arms extending from both ends of the guide shaft are respectively inserted and fixed with L-shaped fixed brackets, and an arc-shaped mounting plate is fixedly connected to the lower end of the fixed bracket, and the mounting plates are respectively fixedly connected to the outer walls of both sides of the test slot;

[0012] A longitudinal lower pin is inserted in the slot near the slot cover, two ends of the lower pin are inserted and fixed on the boss, an oblique annular elastic band is inserted in the middle, and a longitudinal upper pin is inserted on the upper end of the elastic band, and two ends of the upper pin are respectively inserted and fixed on the upper ends of the fixed brackets; a longitudinal positioning column is inserted between the fixed brackets on the lower side of the guide shaft, and pillars are formed at both ends of the positioning column, and the pillars are respectively inserted on the fixed brackets, a transverse positioning bolt is screwed in the middle of the positioning column, and a pressure plate is fixed to the end of the positioning bolt, and the pressure plates on the two sets of opening mechanisms are respectively pressed against the outer walls on both sides of the slot cover.

[0013] Preferably, the bottom surface of the notch on the flip arm is formed with a wire threading groove connected to the wire passing hole, an elastic sealing block is inserted and fixed in the wire threading groove, a socket is formed in the middle of the elastic sealing block, and the reference electrode wire and the auxiliary electrode wire are respectively inserted in the socket of the elastic sealing block.

[0014] Preferably, the lifting actuator comprises two sets of vertical ball screws, on which ball nuts are screwed; support plates are formed on both sides of the lifting test platform, and the ball nuts are respectively plugged and fixed on the support plates on both sides of the lifting test platform, the lower end of the ball screw is fixedly connected to the rotating shaft of the lifting motor through a coupling, and the lifting motor is respectively fixedly connected to the lower end surfaces on both sides of the middle plate, the upper end bearing of the ball screw is connected to the beam plate, and the beam plate sleeve is fixed to the upper column; a gap is provided between the ball screw and the test seat;

[0015] The lifting test platform is rectangular, and the four corners of the lifting test platform are plugged and fixed with ball guide sleeves, and guide columns are plugged into the ball guide sleeves. The upper and lower ends of the guide columns are respectively plugged and fixed on the top plate and the middle plate.

[0016] Preferably, the upper end of the rotating main shaft is connected to a bearing seat via a bearing, and the bearing seat is fixed to the top plate; the diameter of the driving gear is larger than the diameter of the driven gear.

[0017] An auxiliary support assembly is provided on the rotating main shaft, and the auxiliary support assembly includes a support plate inserted in the middle of the rotating main shaft, a support shaft sleeve is fixedly connected to the middle of the support plate, and the rotating main shaft is connected to the support shaft sleeve through a bearing; a plurality of connecting columns are fixedly connected to the support plate, and the upper ends of the connecting columns are fixedly connected to the top plate.

[0018] The beneficial effects of the present invention are:

[0019] 1. Based on the screw hole position on the carrier, the friction tester can install the test piece at different positions of the carrier, thereby realizing the controllable and adjustable rotation radius, and realizing the wear evaluation of the same sample at different speeds in situ.

[0020] 2. The rotary friction test of this friction tester is carried out in the test tank, which can prevent liquid splashing during the electrochemical test and thus ensure the smooth progress of the electrochemical test process. Description of the drawings:

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the present invention;

[0023] Figure 3 It is a schematic diagram of a half-section structure of the present invention in a side view direction;

[0024] Figure 4 A schematic side view of a test seat provided with a cover opening assembly according to the present invention;

[0025] Figure 5 It is a structural schematic diagram of the box cover state of the inner opening cover assembly of the present invention;

[0026] Figure 6 It is a structural schematic diagram of the inner opening cover assembly of the present invention in the open cover state.

[0027] In the figure: 1. Frame; 2. Lifting test platform; 3. Lifting actuator; 4. Test seat; 5. Loading rack; 6. Rotating drive mechanism; 7. Auxiliary support assembly; 8. Opening cover assembly. Specific implementation method:

[0028] Example: See Figures 1 to 3 As shown, a variable speed rotary corrosion friction tester comprises a frame 1 of the tester, a lifting test platform 2, a lifting actuator 3, a test seat 4, a carrier 5 and a rotating drive mechanism 6. The frame 1 comprises a bottom plate 11, and a rectangular middle plate 13 and a top plate 15 are respectively arranged above the bottom plate 11. Upper columns 14 and lower columns 12 are respectively fixed to the upper and lower end surfaces of the four corners of the middle plate 13. The lower end of the lower column 12 is fixed to the bottom plate 11, and the upper end of the upper column 14 is fixed to the top plate 15. The lifting test platform 2 is arranged on the middle plate 13 and the top plate 15 and is based on the lifting actuator 3. It moves up and down between the middle plate 13 and the top plate 15; a test seat 4 is arranged in the middle of the lifting test platform 2, and the test seat 4 includes a cylindrical test slot 41, and a bottom plate 411 is formed at the lower end of the test slot 41, and the bottom plate 411 is fixed to the lifting test platform 2, and a slot cover 45 is inserted at the upper end of the test slot 41, and a friction disc 43 and an electrode disc 42 distributed in the upper and lower directions are inserted in the test slot 41, and a plurality of screws 44 are inserted in the outer ring of the friction disc 43, and the screws 44 pass through the electrode disc 42 and are screwed and fixed on the bottom plate 411; the test slot 41 and the slot cover 45 are both made of transparent material;

[0029] A disc-shaped carrier 5 is inserted into the test groove 41 above the friction disc 43, and a plurality of bolt connection holes 51 are formed on the lower end surface of the carrier 5; the rotary drive mechanism 6 comprises a vertical rotary spindle 61, the lower end of the rotary spindle 61 passes through the slot cover 45 and is plugged and fixed in the middle of the carrier 5, and the upper end is pivotally connected to the middle of the top plate 15, a high-speed servo motor 64 is fixedly connected to one side of the top plate 15, and the high-speed servo motor 64 can adjust the speed, and the rotating shaft of the high-speed servo motor 64 extends out of the top plate 15 and is plugged and fixed with a driving gear 63, a driven gear 62 is meshed on the driving gear 63, and the driven gear 62 is plugged and fixed on the rotary spindle 61.

[0030] The central axis of the rotating spindle 61 , the central axis of the test slot 41 , the central axis of the friction disk 43 , the central axis of the electrode disk 42 and the central axis of the carrier 5 are on the same straight line.

[0031] The diameter of the inner wall of the test groove 41 is larger than the diameter of the electrode disk 42, the diameter of the electrode disk 42 is equal to the diameter of the friction disk 43, the diameter of the friction disk 43 is larger than the diameter of the carrier 5, the bolt connection holes 51 on the lower end surface of the carrier 5 are distributed on a plurality of concentric pitch circles, the center of the pitch circle is located at the central axis of the carrier 5, corresponding to the bolt connection holes 51 which are arranged from the middle of the carrier 5 to the outer circle and are evenly distributed in a ring shape around the central axis of the carrier 5, the test piece is arranged in the test groove 41 for testing, and the test piece is fixed to the carrier 5 by bolts cooperating with the bolt connection holes 51, the test piece is driven to rotate by the carrier 5, the lower surface of the test piece contacts the friction disk 43, and friction occurs between the friction disk 43; and the center distances from the bolt connection holes 51 to the carrier 5 are different, so as to simultaneously realize multiple groups of friction and wear tests under the same angular velocity and different linear velocity parameters, thereby improving the test efficiency.

[0032] Lead wires are electrically connected to both sides of the electrode disk 42, and the wires include a reference electrode wire and an auxiliary electrode wire. The reference electrode wire and the auxiliary electrode wire are fixed to the inner walls of both sides of the test tank 41, and a gap is provided between the reference electrode wire and the auxiliary electrode wire and the outer wall of the sample rack 5; wire holes 451 are provided on both sides of the tank cover 45, and the reference electrode wire and the auxiliary electrode wire are respectively inserted into the wire holes 451 of the tank cover 45; the test tank 41 is an insulator, and the sample rack 5 and the test piece will not contact the reference electrode wire and the auxiliary electrode wire when rotating; this test machine has a variety of test modes, some of which need to be combined with a chemical test system for test, and the chemical test system mainly includes an electrochemical workstation, on which an auxiliary electrode and a reference electrode are provided. During the test, the reference electrode wire and the auxiliary electrode wire need to be connected to the working electrode (WE) port of the electrochemical workstation, mainly to be electrically connected to the reference electrode and the auxiliary electrode on the electrochemical workstation respectively;

[0033] An annular clamping groove 412 is formed on the outer wall of the upper end of the test groove 41, and an annular clamping strip 452 is formed on the inner wall of the lower end of the groove cover 45. The clamping strip 452 is clamped in the clamping groove 412 of the test groove 41;

[0034] The slot cover 45 is formed with an avoidance hole opposite to the rotating main shaft 61 in the middle thereof. The slot cover 45 is composed of two semicircular cover bodies, and the wire holes 451 are respectively arranged on the two cover bodies.

[0035] See Figure 4 , 5 As shown, two groups of opposite cover opening mechanisms 8 are respectively arranged on both sides of the slot cover 45, and the cover opening mechanism 8 includes a flip arm 81 fixedly connected to the upper end surface of the cover body and extending horizontally, one end of the flip arm 81 extends out of the outer side of the cover body and is formed with a boss 811 extending upward, and a horizontal notch 812 is formed in the middle of the boss 811, and guide grooves 813 that are horizontal and penetrate the front and rear end surfaces of the boss 811 are respectively formed on the front and rear side walls of the notch 812, and a longitudinal guide shaft 82 is inserted in the guide groove 813, and the flip arms 81 extending from both ends of the guide shaft 82 are respectively inserted and fixed with L-shaped fixed brackets 83, and the lower end of the fixed bracket 83 is fixedly connected with an arc-shaped mounting plate 84, and the mounting plate 84 is respectively fixed to the outer walls of both sides of the test slot 41;

[0036] A longitudinal lower pin 85 is inserted into the notch 812 near one side of the slot cover 45, and the two ends of the lower pin 82 are inserted and fixed on the boss 811, and an oblique annular elastic band 87 is inserted in the middle, and the elastic band 87 is in a tensioned state. The upper end of the elastic band 87 is inserted with a longitudinal upper pin 86, and the two ends of the upper pin 86 are respectively inserted and fixed to the upper ends of the fixed brackets 83; a longitudinal positioning column 88 is inserted between the fixed brackets 83 on the lower side of the guide shaft 82, and the two ends of the positioning column 88 are formed with pillars 881, and the pillars 881 are respectively inserted on the fixed brackets 83, and the middle part of the positioning column 88 is screwed with a transverse positioning bolt 89, and the end of the positioning bolt 89 is fixedly connected with a pressing plate 810, and the pressing plates 810 on the two sets of opening mechanisms 8 are respectively pressed against the outer walls on both sides of the slot cover 45; the positioning bolts 89 can realize the stable setting of the slot cover 45 on the test slot 41,

[0037] However, as described below, the lifting actuator 3 has ball screws 31 on both sides of the test groove 41, and is combined with Figure 1 , 2 The overall structure of the test machine is that the two covers constituting the slot cover 45 are not convenient to be moved out of the test machine from the two sides of the test slot 41, so the above-mentioned cover opening mechanism 8 is added. When the cover needs to be opened, the positioning bolt 89 is adjusted to realize that the pressing plate 810 is separated from the slot cover 45, and under the elastic force of the elastic band 87, the slot cover 45 is first moved horizontally to separate from the test slot 41, and then turned upward after being separated from the test slot 41, so that the two covers constituting the slot cover 45 are in an upright state and distributed on both sides of the test slot 41, as shown in FIG. Figure 6 As shown, the object carrier 5 will not be affected from entering and exiting the test tank 41, and the opening and closing of the cover is more convenient.

[0038] The bottom surface of the notch 812 on the flip arm 81 is formed with a threading groove 814 connected to the wire hole 451, and an elastic sealing block is inserted and fixed in the threading groove 814. A jack is formed in the middle of the elastic sealing block, and the reference electrode wire and the auxiliary electrode wire are respectively inserted in the jack of the elastic sealing block. When the test tank 41 is filled with a solution, the rotation of the carrier 5 will generate centrifugal force, and the centrifugal force will drive the solution to rotate outward and splash. The test tank 41 is used as a splash-proof tank box, and its elastic sealing block and tank cover 45 can prevent the solution from splashing out of the test tank 41.

[0039] The lifting actuator 3 includes two sets of vertical ball screws 31, and ball nuts 33 are screwed on the ball screws 31; support plates are formed on both sides of the lifting test platform 2, and the ball nuts 33 are respectively plugged and fixed on the support plates on both sides of the lifting test platform 2. The lower end of the ball screw 31 is fixedly connected to the rotating shaft of the lifting motor 32 through a coupling, and the lifting motor 32 is respectively fixedly connected to the lower end surfaces on both sides of the middle plate 13. The upper end bearing of the ball screw 31 is connected to the beam plate 34, and the beam plate 34 is fixed to the upper column 14 by inserting sleeves; a gap is provided between the ball screw 31 and the test seat 4;

[0040] The lifting test platform 2 is rectangular, and the four corners of the lifting test platform 2 are plugged and fixed with ball guide sleeves 35, and the ball guide sleeves 35 are plugged with guide columns 36. The upper and lower ends of the guide columns 36 are respectively plugged and fixed to the top plate 15 and the middle plate 13.

[0041] The upper end of the rotating main shaft 61 is connected to a bearing seat 65 through a bearing, and the bearing seat 65 is fixed to the top plate 15; the diameter of the driving gear 63 is larger than the diameter of the driven gear 62, and thus the rotation speed of the rotating main shaft 61 is larger than the rotation speed of the high-speed servo motor 64, so that the testing machine has a higher rotation speed;

[0042] The rotating main shaft 61 is provided with an auxiliary support assembly 7, which includes a support plate 71 inserted in the middle of the rotating main shaft 61, a support sleeve is fixedly connected to the middle of the support plate 71, and the rotating main shaft 61 is connected to the support sleeve through a bearing; a plurality of connecting columns 72 are fixedly connected to the support plate 71, and the upper ends of the connecting columns 72 are fixedly connected to the top plate 15. The auxiliary support assembly 7 can improve the rotation stability of the rotating main shaft 61.

[0043] Working principle: This structure is a testing machine. Based on the high-speed servo motor 64 and the screw hole position on the carrier 5, the testing machine can realize the friction and wear test of the object installed on the carrier 5 at different speeds and multiple groups of the same angular velocity and different linear velocity parameters at the same time.

[0044] The tests include dry friction and wear test, static galvanic corrosion test, triboelectric corrosion test, triboelectric corrosion + static electrochemical test and triboelectric corrosion + triboelectric chemical test. For dry friction and wear test, other tests need to add test solution into the test tank 41, while dry friction and wear test mainly conducts friction and wear tests on the test piece under multiple groups of parameters with the same angular velocity and different linear velocity to observe the wear condition of the test sample.

[0045] For other tests, the test piece needs to be immersed in the test solution.

[0046] Static galvanic corrosion test:

[0047] The electrode disk 42 is connected to the working electrode (WE) port of the electrochemical workstation through a lead wire, and the galvanic current and galvanic voltage of the test sample are respectively tested by the electrochemical workstation to determine the galvanic corrosion characteristics of the two working electrodes.

[0048] Triboelectric Corrosion Test:

[0049] The lead of the electrode disk 42 is connected to the working electrode (WE) port of the electrochemical workstation, the friction and wear testing machine and the electrochemical workstation are turned on, and the friction and wear test is carried out on the test sample, and the galvanic corrosion (current, voltage) and friction coefficient are tested simultaneously to determine the interaction between galvanic corrosion and friction and wear.

[0050] Triboelectric corrosion + static electrochemical test:

[0051] After the triboelectric corrosion test, the open circuit potential, AC impedance, and polarization curve of the tested samples were tested by an electrochemical workstation to determine the electrochemical corrosion characteristics of the tested samples after the triboelectric corrosion test.

[0052] Triboelectric corrosion test + triboelectrochemical test:

[0053] After the triboelectric corrosion test, the friction and wear tester and the electrochemical workstation are turned on to test the friction coefficient, and the open circuit voltage, AC impedance, and polarization curve of the test sample are tested simultaneously to determine the corrosion and wear characteristics of the two working electrodes after the triboelectric corrosion test.

[0054] During the above test process, when multiple groups of friction and wear tests with the same angular velocity but different linear velocities are conducted, there is only one group of synchronized friction coefficients.

[0055] The embodiments are used to illustrate the present invention, but not to limit the present invention. Any person skilled in the art may modify the embodiments without violating the spirit and scope of the present invention, and therefore, the scope of protection of the present invention shall be as set forth in the claims of the present invention.

Claims

1. A variable speed rotary corrosion friction tester, comprising a frame (1) of the tester, a lifting test platform (2), a lifting actuator (3), a test seat (4), a load carrier (5) and a rotary drive mechanism (6), wherein the frame (1) comprises a bottom plate (11), a rectangular middle plate (13) and a top plate (15) are respectively arranged above the bottom plate (11), an upper column (14) and a lower column (12) are respectively fixedly connected to the upper and lower end surfaces of the four corners of the middle plate (13), the lower end of the lower column (12) is fixedly connected to the bottom plate (11), and the upper end of the upper column (14) is fixedly connected to the top plate (15), the lifting test platform (2) is arranged on the middle plate (13) and the top plate (15) and moves up and down between the middle plate (13) and the top plate (15) based on the lifting actuator (3); characterized in that: A test seat (4) is arranged in the middle of the lifting test platform (2), and the test seat (4) comprises a cylindrical test slot (41), a bottom plate (411) is formed at the lower end of the test slot (41), and the bottom plate (411) is fixedly connected to the lifting test platform (2), a slot cover (45) is inserted at the upper end of the test slot (41), and a friction disc (43) and an electrode disc (42) arranged in an upper and lower manner are inserted in the test slot (41), and a plurality of screws (44) are inserted into the outer ring of the friction disc (43), and the screws (44) pass through the electrode disc (42) and are screwed and fixed on the bottom plate (411); A disc-shaped carrier (5) is inserted into the test groove (41) above the friction disc (43), and a plurality of bolt connection holes (51) are formed on the lower end surface of the carrier (5); the rotary drive mechanism (6) comprises a vertical rotary main shaft (61), the lower end of the rotary main shaft (61) passes through the groove cover (45) and is plugged and fixed in the middle of the carrier (5), and the upper end is pivotally connected to the middle of the top plate (15), a high-speed servo motor (64) is fixedly connected to one side of the top plate (15), the rotating shaft of the high-speed servo motor (64) extends out of the top plate (15) and is plugged and fixedly connected to a driving gear (63), the driving gear (63) is meshed with a driven gear (62), and the driven gear (62) is plugged and fixed to the rotary main shaft (61).

2. A variable speed rotary corrosion friction testing machine according to claim 1, characterized in that: The central axis of the rotating spindle (61), the central axis of the test groove (41), the central axis of the friction disk (43), the central axis of the electrode disk (42) and the central axis of the carrier (5) are on the same straight line.

3. A variable speed rotary corrosion friction testing machine according to claim 2, characterized in that: The diameter of the inner wall of the test groove (41) is greater than the diameter of the electrode disk (42), the diameter of the electrode disk (42) is equal to the diameter of the friction disk (43), the diameter of the friction disk (43) is greater than the diameter of the carrier (5), the bolt connection holes (51) on the lower end surface of the carrier (5) are distributed on a plurality of concentric pitch circles, the center of the pitch circle is located at the central axis of the carrier (5), and the bolt connection holes (51) are evenly distributed in a ring shape around the central axis of the carrier (5).

4. A variable speed rotary corrosion friction testing machine according to claim 2, characterized in that: Lead wires are electrically connected to both sides of the electrode disk (42), and the wires include a reference electrode wire and an auxiliary electrode wire. The reference electrode wire and the auxiliary electrode wire are respectively fixed to the inner walls of both sides of the test tank (41) and a gap is provided between the reference electrode wire and the outer wall of the carrier (5). Wire holes (451) are provided on both sides of the tank cover (45), and the reference electrode wire and the auxiliary electrode wire are respectively inserted into the wire holes (451) of the tank cover (45). The test tank (41) is an insulator.

5. The variable speed rotary corrosion friction testing machine according to claim 4, characterized in that: An annular clamping groove (412) is formed on the outer wall of the upper end of the test groove (41), and an annular clamping strip (452) is formed on the inner wall of the lower end of the groove cover (45), and the clamping strip (452) is clamped in the clamping groove (412) of the test groove (41); The middle part of the slot cover (45) is formed with an avoidance hole opposite to the rotating main shaft (61). The slot cover (45) is composed of two semicircular cover bodies, and the wire holes (451) are respectively arranged on the two cover bodies.

6. A variable speed rotary corrosion friction testing machine according to claim 5, characterized in that: Two groups of opposite cover opening mechanisms (8) are respectively arranged on both sides of the slot cover (45), and the cover opening mechanism (8) comprises a flip arm (81) fixedly connected to the upper end surface of the cover body and extending in a transverse direction, one end of the flip arm (81) extends out of the outer side of the cover body and is formed with a boss (811) extending upward, a transverse notch (812) is formed in the middle of the boss (811), and guide grooves (813) are formed on the front and rear side walls of the notch (812) and extend in a transverse direction and penetrate the front and rear end surfaces of the boss (811), a longitudinal guide shaft (82) is inserted into the guide groove (813), and the flip arms (81) at both ends of the guide shaft (82) are respectively inserted and fixed with L-shaped fixed brackets (83), and the lower end of the fixed bracket (83) is fixedly connected with an arc-shaped mounting plate (84), and the mounting plate (84) is respectively fixedly connected to the outer walls of both sides of the test slot (41); A longitudinal lower pin shaft (85) is inserted into a notch (812) on one side close to the slot cover (45); the two ends of the lower pin shaft (82) are inserted and fixed on the boss (811); an obliquely placed annular elastic band (87) is inserted and sleeved in the middle; a longitudinal upper pin shaft (86) is inserted at the upper end of the elastic band (87); the two ends of the upper pin shaft (86) are respectively inserted and fixed on the upper end of the fixed bracket (83); the fixed bracket (83) on the lower side of the guide shaft (82) A longitudinal positioning column (88) is inserted between the two sets of cover opening mechanisms (8), and pillars (881) are formed at both ends of the positioning column (88), and the pillars (881) are respectively inserted into the fixed bracket (83). A transverse positioning bolt (89) is screwed in the middle of the positioning column (88), and a pressure plate (810) is fixed to the end of the positioning bolt (89). The pressure plates (810) on the two sets of cover opening mechanisms (8) are respectively pressed against the outer walls on both sides of the slot cover (45).

7. A variable speed rotary corrosion friction testing machine according to claim 6, characterized in that: The bottom surface of the notch (812) on the flip arm (81) is formed with a threading groove (814) connected to the wire hole (451), an elastic sealing block is inserted and fixed in the threading groove (814), a plug hole is formed in the middle of the elastic sealing block, and the reference electrode wire and the auxiliary electrode wire are respectively inserted into the plug hole of the elastic sealing block.

8. The variable speed rotary corrosion friction testing machine according to claim 1, characterized in that: The lifting actuator (3) comprises two sets of vertical ball screws (31), and ball nuts (33) are screwed onto the ball screws (31); support plates are formed on both sides of the lifting test platform (2), and the ball nuts (33) are respectively plugged and fixed on the support plates on both sides of the lifting test platform (2); the lower end of the ball screw (31) is fixedly connected to the rotating shaft of the lifting motor (32) through a coupling, and the lifting motor (32) is respectively fixedly connected to the lower end surfaces on both sides of the middle plate (13); the upper end bearing of the ball screw (31) is connected to a beam plate (34), and the beam plate (34) is plugged and fixed on the upper column (14); a gap is provided between the ball screw (31) and the test seat (4); The lifting test platform (2) is rectangular in shape, and the four corners of the lifting test platform (2) are plugged and fixed with ball guide sleeves (35), and the ball guide sleeves (35) are plugged with guide columns (36), and the upper and lower ends of the guide columns (36) are respectively plugged and fixed on the top plate (15) and the middle plate (13).

9. The variable speed rotary corrosion friction testing machine according to claim 1, characterized in that: The upper end of the rotating main shaft (61) is connected to a bearing seat (65) via a bearing, and the bearing seat (65) is fixed to the top plate (15); the diameter of the driving gear (63) is greater than the diameter of the driven gear (62). The rotating main shaft (61) is provided with an auxiliary support assembly (7), which comprises a support plate (71) inserted in the middle of the rotating main shaft (61), a support shaft sleeve is fixedly connected to the middle of the support plate (71), and the rotating main shaft (61) is connected to the support shaft sleeve through a bearing; a plurality of connecting columns (72) are fixedly connected to the support plate (71), and the upper ends of the connecting columns (72) are fixedly connected to the top plate (15).

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