Electric field shielded rotary friction-wear testing machine

Abstract

The invention discloses an electric-field-shielded rotary friction-wear testing machine, which comprises a rotary driving device capable of driving a ring sample mounting rod to rotate forwards and backwards; a ring sample mounting rod on which a ring sample can be mounted; the vertical loading device can drive the block sample mounting table to lift, so that the block sample on the block sample mounting table is propped against the ring sample on the ring sample mounting rod to apply a loading force, and the magnitude of the loading force is adjusted; the detection device is arranged between the vertical loading device and the block sample mounting table and comprises a loading force sensor and two opposite friction force sensors, the loading force sensor is used for detecting vertical loading force, the axial direction of the ring sample mounting rod is perpendicular to the force measuring direction of the loading force sensor and the force measuring direction of the friction force sensors; a block sample mounting table on which a block sample can be mounted; the electric field shielding box is arranged above the rack, and the block sample mounting table and the ring sample mounting rod are located in the electric field shielding box. The invention provides the friction-wear testing machine which can simultaneously meet the test requirements of a rotating friction pair and a swinging friction pair.

Description

Technical Field

[0001] The invention relates to the technical field of friction and wear testing machines, in particular to a rotary friction and wear testing machine with electric field shielding. Background Art

[0002] The triboelectric effect is common in the friction process. Friction and triboelectric charging between mechanical contact or sliding material surfaces are related. The two are simultaneous and homologous and have been widely studied. When materials with different triboelectric properties are rubbed, triboelectric charges can be observed due to the transfer of electrons between the material surfaces. Electrons from the one side of the friction pair with weaker electron binding ability will be transferred to the other side. At this time, the object that gains electrons will show negative charge, while the object that loses electrons will show positive charge.

[0003] It is worth noting that the friction charge is usually weak in the initial stage, but as the friction time increases, the accumulation of charge can generate extremely high voltage, which may cause explosions in flammable environments and cause electronic components to fail. In addition, the accumulation of friction charge on the friction interface will also increase energy consumption. Therefore, the triboelectric effect of friction pairs needs to be deeply explored in both production and life.

[0004] Recent studies have shown that in horizontal reciprocating friction, there is a strong positive correlation between the triboelectricity and friction coefficient of metal and non-metallic samples. By adjusting the level of triboelectricity, the friction coefficient can be regulated. However, the current research on rotating friction pairs and swinging friction pairs is still relatively insufficient. In view of this, it is particularly necessary to develop a friction and wear testing machine that can meet the testing requirements of both rotating friction pairs and swinging friction pairs. Summary of the invention

[0005] The present invention provides an electric field shielded rotary friction and wear testing machine, so as to provide a friction and wear testing machine that can simultaneously meet the testing requirements of rotating friction pairs and swinging friction pairs, aiming to deeply study the triboelectric effect of rotating friction pairs and swinging friction pairs.

[0006] In order to achieve the above object, the technical solution of the present invention is:

[0007] An electric field shielded rotary friction and wear testing machine, comprising:

[0008] A rotation drive device, wherein the rotation drive device can drive the ring specimen mounting rod to rotate forward and reverse;

[0009] A ring specimen mounting rod, on which a ring specimen can be mounted;

[0010] A vertical loading device, which can drive the block sample mounting platform to vertically lift and lower, so that the block sample on the block sample mounting platform and the ring sample on the ring sample mounting rod abut against each other to apply a vertical loading force, and adjust the magnitude of the vertical loading force by vertical lifting and lowering;

[0011] A detection device, the detection device is arranged between the vertical loading device and the block sample mounting platform, the detection device comprises a loading force sensor and two oppositely arranged friction force sensors, the loading force sensor is used to detect the vertical loading force, the axial direction of the ring sample mounting rod, the force measuring direction of the loading force sensor and the force measuring direction of the friction force sensor are perpendicular to each other;

[0012] A block specimen mounting platform, on which a block specimen can be mounted;

[0013] An electric field shielding box is placed above the frame, and the block sample mounting platform and the ring sample mounting rod are located in the electric field shielding box.

[0014] Furthermore, it also includes a frame, and the rotation drive device and the vertical loading device are arranged on the frame.

[0015] Further, the ring specimen mounting rod comprises a main rod body and a locking nut;

[0016] The main rod body is provided with a step, the locking nut is threadedly connected to the main rod body, and the ring sample can be sleeved on the main rod body;

[0017] By tightening the locking nut, the ring specimen can be clamped between the locking nut and the step.

[0018] Furthermore, the rotary drive device includes a seat bearing and a servo motor fixed on the frame, one end of the main rod body is connected to the output shaft of the servo motor, and the other end of the main rod body is rotatably connected to the frame through the seat bearing.

[0019] Further, the vertical loading device includes a fixed support, a guide rod, a spring, a linear bearing and a scissor jack;

[0020] The scissor jack is fixed on the frame, the fixed support is fixed on the top of the scissor jack, the guide rod is vertically fixed on the fixed support, the top of the guide rod is slidably connected to the linear bearing, and the two ends of the spring are fixedly connected to the fixed support and the linear bearing respectively.

[0021] Furthermore, the detection device also includes a lower support platform, an upper support platform and a sensor mounting platform;

[0022] The lower support platform and the upper support platform are respectively fixed at two ends of the loading force sensor, the lower support platform can abut the top of the linear bearing, the sensor mounting platform is fixed on the top of the upper support platform, and the friction force sensor is arranged on the sensor mounting platform.

[0023] Further, the block specimen mounting platform includes a block specimen placement slot, a bracket, a box-type slide block and an optical axis;

[0024] The two oppositely arranged brackets are fixed at the bottom of the block sample placement groove, the two ends of the optical axis are fixedly connected to the brackets, the two end portions of the optical axis are abutted against two oppositely arranged friction sensors, the box-type slider is fixed on the sensor mounting platform, the box-type slider is located between the two brackets, and the optical axis is slidably connected to the sensor mounting platform through the box-type slider.

[0025] Furthermore, the vertical loading device also includes a connecting member, a sliding block and a guide rail vertically arranged on the frame;

[0026] The slider is arranged on the guide rail, and the slider is fixedly connected to the lower support platform through a connecting piece.

[0027] Furthermore, it also includes a mercury slip ring, which is arranged at an end of one end of the main rod body away from one end of the servo motor.

[0028] Beneficial effects:

[0029] The present invention provides an electric field shielded rotary friction and wear testing machine, which provides vertical loading force through a vertical loading device, drives a ring sample mounting rod to rotate forward and reverse through a rotary driving device, so that the ring sample on the ring sample mounting rod can rotate relative to the block sample on the block sample mounting table, so that the ring sample and the block sample can simulate a rotating friction pair and a swinging friction pair. Two friction force sensors arranged opposite to each other on a detection device enable the detection device to measure not only the friction force value of rotating friction, but also the friction force value of swinging friction. By setting an electric field shielding box, the testing machine can simulate the sample friction phenomenon under the condition of shielding external electric field interference, thereby providing an experimental basis for studying the relationship between the friction and wear state and the triboelectric effect, so that test personnel can study the triboelectric effect and the friction and wear state of the rotating friction pair or the swinging friction pair. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0031] Figure 1 It is a structural schematic diagram of a rotary friction and wear testing machine with electric field shielding disclosed in the present invention without an electric field shielding box;

[0032] Figure 2 It is a structural schematic diagram of an electric field shielding rotary friction and wear testing machine disclosed in the present invention;

[0033] Figure 3 It is a cross-sectional schematic diagram of a rotary drive device, a ring sample mounting rod and a block sample mounting platform of an electric field shielded rotary friction and wear testing machine disclosed in the present invention;

[0034] Figure 4 It is a schematic diagram of the coordination of a ring sample mounting rod, a detection device and a block sample mounting platform of an electric field shielding rotary friction and wear testing machine disclosed in the present invention;

[0035] Figure 5 It is a structural schematic diagram of a block specimen mounting platform of an electric field shielding rotary friction and wear testing machine disclosed in the present invention;

[0036] Figure 6 It is a structural schematic diagram of a detection device of a rotary friction and wear testing machine with electric field shielding disclosed in the present invention;

[0037] Figure 7 A schematic diagram of the cooperation between the detection device and the vertical loading device of the electric field shielding rotary friction and wear testing machine disclosed in the present invention Figure 1 ;

[0038] Figure 8 A schematic diagram of the cooperation between the detection device and the vertical loading device of the electric field shielding rotary friction and wear testing machine disclosed in the present invention Figure 2 ;

[0039] Fig. 9 It is a structural schematic diagram of a vertical loading device of an electric field shielding rotary friction and wear testing machine disclosed in the present invention;

[0040] Fig.10 It is a cross-sectional schematic diagram of a vertical loading device of a rotary friction and wear testing machine with electric field shielding disclosed in the present invention;

[0041] Fig.11 The present invention is a schematic structural diagram of a frame of an electric field shielding rotary friction and wear testing machine disclosed in the present invention.

[0042] In the figure:

[0043] 1. Frame; 11. Motor support plate; 12. Vertical support plate; 13. Bearing support plate with seat; 14. Jack support plate; 15. Crossbeam;

[0044] 2. Rotation drive device; 21. Pillow block bearing; 22. Servo motor; 23. Coupling;

[0045] 3. Ring specimen mounting rod; 31. Main rod body; 32. Ring specimen; 33. Locking nut; 34. Step; 35. Mercury slip ring;

[0046] 4. Vertical loading device; 41. Fixed support; 42. Guide rod; 43. Spring; 44. Linear bearing; 45. Scissor jack; 46. Slider; 47. Guide rail; 48. Connector;

[0047] 5. Detection device; 51. Lower support platform; 52. Upper support platform; 53. Sensor mounting platform; 54. Loading force sensor; 55. Friction force sensor; 56. Sensor bracket; 57. Round head bolt;

[0048] 6. Block specimen mounting table; 61. Block specimen placement slot; 62. Bracket; 63. Box-type slide block; 64. Optical axis;

[0049] 7. Electric field shielding box. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0051] This embodiment provides a rotary friction and wear testing machine with electric field shielding, such as Figure 1 and Figure 2 As shown, including:

[0052] A rotation drive device 2, wherein the rotation drive device 2 can drive the ring sample mounting rod 3 to rotate forward and reverse;

[0053] a ring sample mounting rod 3, on which a ring sample can be mounted;

[0054] A vertical loading device 4, wherein the vertical loading device 4 can drive the block sample mounting platform 6 to vertically rise and fall, so that the block sample on the block sample mounting platform 6 and the ring sample on the ring sample mounting rod 3 abut against each other to apply a vertical loading force, and the magnitude of the vertical loading force can be adjusted by vertically rising and falling;

[0055] The detection device 5 is arranged between the vertical loading device 4 and the block sample mounting platform 6. Figure 4 and Figure 6 As shown, the detection device 5 includes a loading force sensor 54 and two oppositely arranged friction force sensors 55, the loading force sensor 54 is used to detect the vertical loading force, the axial direction of the ring sample mounting rod 3, the force measuring direction of the loading force sensor 54 and the force measuring direction of the friction force sensor 55 are perpendicular to each other, the loading force sensor 54 is used to measure the vertical loading force when the block sample and the ring sample are in contact, and the friction force sensor 55 is used to detect the friction force value when the block sample and the ring sample are in rotational friction or swinging friction;

[0056] a block sample mounting platform 6, on which a block sample can be mounted;

[0057] An electric field shielding box 7, the electric field shielding box 7 is placed above the rack 1, and the block sample mounting platform 6 and the ring sample mounting rod 3 are located in the electric field shielding box 7;

[0058] In this embodiment, the electric field shielding box 7 is composed of an acrylic box and an electromagnetic shielding cloth. The electromagnetic shielding cloth is pasted on the surface of the acrylic box and has a good electric field shielding effect, so as to provide a stable environment for the test as much as possible.

[0059] The present embodiment provides an electric field shielded rotary friction and wear testing machine, which provides vertical loading force through a vertical loading device 4, and drives the ring sample mounting rod 3 to rotate forward and reverse through a rotary drive device 2, so that the ring sample on the ring sample mounting rod 3 can rotate relative to the block sample on the block sample mounting table 6, so that the ring sample and the block sample can simulate a rotating friction pair and a swinging friction pair. The two friction force sensors 55 arranged opposite to each other on the detection device 5 enable the detection device 5 to measure not only the friction force value of the rotating friction, but also the friction force value of the swinging friction. By setting an electric field shielding box 7, the testing machine can simulate the sample friction phenomenon under the condition of shielding external electric field interference, thereby providing an experimental basis for studying the relationship between the friction and wear state and the triboelectric effect, so that the test personnel can study the triboelectric effect and the friction and wear state of the rotating friction pair or the swinging friction pair.

[0060] In a specific embodiment, Figure 1 and Figure 2 As shown, it also includes a frame 1, and the rotation drive device 2 and the vertical loading device 4 are arranged on the frame 1.

[0061] In a specific embodiment, Figure 3 and Figure 4 As shown, the ring specimen mounting rod 3 includes a main rod body 31 and a locking nut 33;

[0062] The main rod body 31 is provided with a step 34, the locking nut 33 is threadedly connected to the main rod body 31, and the ring sample can be sleeved on the main rod body 31;

[0063] By tightening the lock nut 33 , the ring sample 32 can be clamped between the lock nut 33 and the step 34 .

[0064] In a specific embodiment, Figure 3 As shown, the rotation drive device 2 includes a seat bearing 21 and a servo motor 22 fixed on the frame 1. One end of the main rod body 31 is connected to the output shaft of the servo motor 22 through a coupling 23, and the other end of the main rod body 31 is rotatably connected to the frame 1 through the seat bearing 21. The seat bearing 21 is used to ensure the stability of the rotation of the main rod body 31.

[0065] In a specific embodiment, Fig. 9 and Fig.10 As shown, the vertical loading device 4 includes a fixed support 41, a guide rod 42, a spring 43, a linear bearing 44 and a scissor jack 45;

[0066] The scissor jack 45 is fixed to the frame 1 by bolts, the fixed support 41 is fixed to the top of the scissor jack 45 by bolts, the guide rod 42 is vertically fixed to the fixed support 41, the guide rod 42 and the fixed support 41 are interference fit, the top of the guide rod 42 is slidably connected to the linear bearing 44, and the two ends of the spring 43 are respectively welded and fixed to the fixed support 41 and the linear bearing 44;

[0067] In this embodiment, the scissor jack 45 is a manual scissor jack. By vertically adjusting the scissor jack 45, the detection device 5 and the block sample mounting platform 6 are lifted or lowered, thereby changing the magnitude of the loading force when the ring sample and the block sample are in contact, and further changing the friction force when the ring sample and the block sample rotate or swing.

[0068] In a specific embodiment, Figure 6 As shown, the detection device 5 also includes a lower support platform 51, an upper support platform 52 and a sensor mounting platform 53;

[0069] The lower support platform 51 and the upper support platform 52 are respectively fixed at the two ends of the load force sensor 54, and the lower support platform 51 can abut the top of the linear bearing 44. The sensor mounting platform 53 is fixed to the top of the upper support platform 52 by bolts. The friction force sensor 55 is arranged on the sensor mounting platform 53 through the sensor bracket 56, and the sensor bracket 56 is fixed to the sensor mounting platform 53 by bolts. The sensor mounting platform 53 is provided with a waist-shaped hole to facilitate the position adjustment of the sensor bracket 56.

[0070] In a specific embodiment, Figure 5 As shown, the block sample mounting platform 6 includes a block sample placement slot 61, a bracket 62, a box-type slider 63 and an optical axis 64;

[0071] The two oppositely arranged brackets 62 are fixed to the bottom of the block sample placement groove 61 by bolts, the two ends of the optical axis 64 are fixedly connected to the brackets 62 by bolts, the two ends of the optical axis 64 are in contact with the two oppositely arranged friction sensors 55, the box-type slider 63 is fixed to the sensor installation platform 53 by bolts, the box-type slider 63 is located between the two brackets 62, and the optical axis 64 is slidably connected to the sensor installation platform 53 through the box-type slider 63;

[0072] The ring sample mounting rod 3 and the block sample mounting platform 6 allow the ring sample and the block sample to be quickly replaced, so that the block sample and the ring sample can be replaced with materials with different triboelectric properties according to the requirements of different tests;

[0073] When the block sample and the ring sample rotate or swing, the friction force exerted on the block sample will be transmitted to the optical axis 64 which can move horizontally relative to the sensor mounting platform 53, and the friction force between the block sample and the ring sample can be measured by utilizing the close contact between the optical axis 64 and the friction sensor 55. Specifically, when the optical axis 64 contacts and squeezes the friction sensor 55, the friction sensor 55 can obtain the force value, thereby detecting the friction force. During the continuous friction process, the optical axis 64 and the friction sensor 55 are constantly squeezed, thereby detecting the change in the friction force of the block sample and the ring sample over a period of time.

[0074] Friction sensors 55 are provided on both sides of the optical axis 64. Together with the servo motor 22 that can rotate forward and reverse, the movement form of the testing machine is more diversified. Not only can the rotational friction of the block sample and the ring sample be realized (the servo motor 22 maintains forward or reverse rotation), but also the swinging friction of the block sample and the ring sample can be realized (the servo motor 22 rotates forward and reverse alternately) to detect the swinging friction.

[0075] In a specific embodiment, Figure 8 As shown, the vertical loading device 4 further includes a connecting member 48, a slider 46 and a guide rail 47 vertically arranged on the frame 1;

[0076] The slider 46 is disposed on the guide rail 47, and the slider 46 is fixedly connected to the lower support platform 51 through a connecting member 48. In this embodiment, the connecting member 48 is L-shaped, and the connecting member 48 is fixedly connected to the slider 46 and the lower support platform 51 through a fastener;

[0077] The slider 46 and the guide rail 47 play a guiding role, so that the movement of the vertical loading device 4 is more precise, thereby enabling the vertical loading device 4 to provide a more accurate vertical loading force.

[0078] In a specific embodiment, Figure 3 and Figure 4 As shown, it also includes a mercury slip ring 35, which is arranged at the end of the main rod body 31 away from the servo motor 22. The mercury slip ring 35 is threadedly connected to the main rod body 31 and is used to conduct friction current generated by the friction between the block sample and the ring sample.

[0079] In a specific embodiment, Figure 4 and Figure 7 As shown, a semicircular head bolt 57 is provided at the bottom of the lower support platform 51 , and the head of the semicircular head bolt 57 can abut against the top of the linear bearing 44 , and the head of the semicircular head bolt 57 is located at the end of the inner hole of the linear bearing 44 .

[0080] In a specific embodiment, Fig.11 As shown, the frame 1 is provided with a detachable motor support plate 11, a vertical support plate 12, a bearing support plate 13 with a seat, a jack support plate 14 and a crossbeam 15, the motor support plate 11 is connected to the servo motor 22 by bolts, the vertical support plate 12 is connected to the guide rail 47 by bolts, the bearing support plate 13 with a seat is connected to the bearing 21 with a bolt, the jack support plate 14 is connected to the scissor jack 45 by bolts, and waist-shaped holes are provided on the motor support plate 11 and the bearing support plate 13 with a seat to facilitate the position adjustment of the servo motor 22 and the bearing 21 with a seat;

[0081] In this embodiment, the frame 1 and the crossbeam 15 are both made of industrial aluminum profiles, the motor support plate 11, the seat bearing support plate 13, the jack support plate 14 and the crossbeam 15 are arranged on the frame 1 by T-bolts, and the vertical support plate 12 is arranged on the crossbeam 15 by T-bolts, the T-bolts slide in the slide grooves of the industrial aluminum profiles, and the flange nuts are sleeved on the T-bolts;

[0082] Loosen the flange nut to allow the T-bolt to slide in the slide groove of the industrial aluminum profile, thereby adjusting the relative positions of the motor support plate 11, the vertical support plate 12, the seat bearing support plate 13, the jack support plate 14, the crossbeam 15 and the frame 1.

[0083] During the test, first remove the electric field shielding box 7, select the block sample and the ring sample with different electrical properties, and install them on the ring sample installation rod 3 and place them in the groove of the block sample placement groove 61 respectively, adjust the scissor jack 45 so that the block sample and the ring sample are in contact, and then adjust the height of the scissor jack 45 again, obtain the required loading force according to the reading of the loading force sensor 54, and then install the electric field shielding box 7;

[0084] When conducting friction and wear tests, start the servo motor 22, use the servo motor encoder to adjust the movement form, speed, frequency, etc. of the servo motor 22, and drive the main rod body 31 to rotate through the coupling 23, so that the ring sample rotates relative to the block sample, thereby realizing a rotational friction or swinging friction and wear test. The mercury slip ring 35 can be connected to an electrometer to collect friction current and voltage, which is used to study the relationship between tribology and triboelectricity when the block sample and the ring sample rub against each other.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electric field shielded rotary friction and wear testing machine, characterized in that: include: A rotation drive device (2), wherein the rotation drive device (2) is capable of driving the ring sample mounting rod (3) to rotate forward and reverse; A ring sample mounting rod (3), on which a ring sample can be mounted; A vertical loading device (4), wherein the vertical loading device (4) is capable of driving the block sample mounting platform (6) to vertically lift and lower, so that the block sample on the block sample mounting platform (6) and the ring sample on the ring sample mounting rod (3) abut against each other to apply a vertical loading force, and the magnitude of the vertical loading force is adjusted by vertical lifting and lowering; A detection device (5), the detection device (5) is arranged between the vertical loading device (4) and the block sample mounting platform (6), the detection device (5) comprises a loading force sensor (54) and two friction force sensors (55) arranged opposite to each other, the loading force sensor (54) is used to detect the vertical loading force, and the axial direction of the ring sample mounting rod (3), the force measuring direction of the loading force sensor (54) and the force measuring direction of the friction force sensor (55) are perpendicular to each other; A block sample mounting platform (6), on which a block sample can be mounted; An electric field shielding box (7) is placed above the frame (1), and the block sample mounting platform (6) and the ring sample mounting rod (3) are located inside the electric field shielding box (7).

2. The electric field shielding rotary friction and wear testing machine according to claim 1, characterized in that: It also comprises a frame (1), on which the rotary drive device (2) and the vertical loading device (4) are arranged.

3. The electric field shielding rotary friction and wear testing machine according to claim 2, characterized in that: The ring sample mounting rod (3) comprises a main rod body (31) and a locking nut (33); The main rod body (31) is provided with a step (34), the locking nut (33) and the main rod body (31) are threadedly connected, and the ring sample can be sleeved on the main rod body (31); By tightening the locking nut (33), the ring sample can be clamped between the locking nut (33) and the step (34).

4. The electric field shielding rotary friction and wear testing machine according to claim 3, characterized in that: The rotary drive device (2) comprises a seat bearing (21) and a servo motor (22) fixed on the frame (1); one end of the main rod body (31) is connected to the output shaft of the servo motor (22); and the other end of the main rod body (31) is rotatably connected to the frame (1) via the seat bearing (21).

5. The electric field shielding rotary friction and wear testing machine according to claim 2, characterized in that: The vertical loading device (4) comprises a fixed support (41), a guide rod (42), a spring (43), a linear bearing (44) and a scissor jack (45); The scissor jack (45) is fixed on the frame (1), the fixed support (41) is fixed on the top of the scissor jack (45), the guide rod (42) is vertically fixed on the fixed support (41), the top of the guide rod (42) is slidably connected to the linear bearing (44), and the two ends of the spring (43) are respectively fixedly connected to the fixed support (41) and the linear bearing (44).

6. The electric field shielding rotary friction and wear testing machine according to claim 5, characterized in that: The detection device (5) further comprises a lower support platform (51), an upper support platform (52) and a sensor mounting platform (53); The lower support platform (51) and the upper support platform (52) are respectively fixed at two ends of the load force sensor (54); the lower support platform (51) can abut against the top of the linear bearing (44); the sensor mounting platform (53) is fixed on the top of the upper support platform (52); and the friction force sensor (55) is arranged on the sensor mounting platform (53).

7. The electric field shielding rotary friction and wear testing machine according to claim 6, characterized in that: The block sample mounting platform (6) comprises a block sample placement groove (61), a bracket (62), a box-type sliding block (63) and an optical axis (64); The two oppositely arranged brackets (62) are fixed at the bottom of the block sample placement groove (61), the two ends of the optical axis (64) are fixedly connected to the brackets (62), the two end portions of the optical axis (64) are in contact with two oppositely arranged friction sensors (55), the box-type slider (63) is fixed on the sensor mounting platform (53), the box-type slider (63) is located between the two brackets (62), and the optical axis (64) is slidably connected to the sensor mounting platform (53) through the box-type slider (63).

8. The electric field shielding rotary friction and wear testing machine according to claim 6, characterized in that: The vertical loading device (4) further comprises a connecting member (48), a sliding block (46) and a guide rail (47) vertically arranged on the frame (1); The slider (46) is arranged on a guide rail (47), and the slider (46) is fixedly connected to a lower support platform (51) via a connecting piece (48).

9. The electric field shielding rotary friction and wear testing machine according to claim 4, characterized in that: It also includes a mercury slip ring (35), which is arranged at an end of one end of the main rod body (31) away from one end of the servo motor (22).

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