Rotary friction and wear testing machine with electric field shielding

Abstract

The application discloses a kind of electric field shielded rotary friction and wear testing machine, comprising: rotary drive device, can drive ring sample mounting rod positive and negative rotation;Ring sample mounting rod, ring sample can be installed;Vertical loading device, can drive block sample mounting table lifting, so that the block sample on block sample mounting table and the ring sample on ring sample mounting rod abut to exert loading force, and adjust the size of loading force;Detection device, between vertical loading device and block sample mounting table, including loading force sensor and two opposite friction force sensors, loading force sensor is used to detect vertical loading force, the axial direction of ring sample mounting rod, the force direction of loading force sensor and friction force sensor is perpendicular;Block sample mounting table, can install block sample;Electric field shielding box, above rack, block sample mounting table and ring sample mounting rod are located in electric field shielding box. To provide a kind of can simultaneously meet the test demand of rotary friction pair and swing friction pair friction and wear testing machine.

Description

Technical Field

[0001] This invention relates to the field of friction and wear testing machine technology, and more particularly to a rotary friction and wear testing machine with electric field shielding. Background Technology

[0002] Triboelectricity is commonly observed during friction processes. Friction and triboelectric charging between mechanically contacting or sliding material surfaces are related, exhibiting simultaneity and common origin, and have been extensively studied. When friction occurs between materials with different triboelectric properties, triboelectric charges can be observed due to the transfer of electrons between the material surfaces. In a friction pair, electrons from the side with weaker electron binding capacity will transfer to the other side. The object that gains electrons will exhibit negative charge, while the object that loses electrons will exhibit positive charge.

[0003] It is worth noting that while triboelectric charges are typically weak in the initial stages, their accumulation over time can generate extremely high voltages. In flammable environments, this can trigger explosions and cause electronic component failures. Furthermore, the accumulation of triboelectric charges at the friction interface increases energy consumption. Therefore, both production and daily life require in-depth research into the triboelectric effects of friction pairs.

[0004] Recent studies have shown a strong positive correlation between the triboelectric charge and the coefficient of friction in horizontal reciprocating friction, and the coefficient of friction can be controlled by adjusting the level of triboelectric charge. However, research on rotating and oscillating friction pairs remains relatively insufficient. Therefore, developing a friction and wear testing machine capable of simultaneously meeting the testing requirements of both rotating and oscillating friction pairs is particularly necessary. Summary of the Invention

[0005] This invention provides an electric field shielded rotary friction and wear testing machine, which can simultaneously meet the testing requirements of rotary friction pairs and oscillating friction pairs, aiming to conduct in-depth research on the triboelectric effect of rotary friction pairs and oscillating friction pairs.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

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

[0008] A rotary drive device, which is capable of driving the ring sample mounting rod to rotate forward and backward;

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

[0010] A vertical loading device capable of driving a block sample mounting table vertically to make a block sample on the block sample mounting table and a ring sample on the ring sample mounting rod abut each other to apply a vertical loading force and adjust the size of the vertical loading force by vertical lifting;

[0011] A detection device arranged between the vertical loading device and the block sample mounting table, the detection device comprising a loading force sensor for detecting the vertical loading force and two oppositely arranged friction force sensors, 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 being perpendicular to each other;

[0012] A block sample mounting table on which a block sample can be mounted;

[0013] An electric field shielding box placed above the rack, the block sample mounting table and the ring sample mounting rod being located in the electric field shielding box.

[0014] Further, the rotating drive device and the vertical loading device are arranged on the rack.

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

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

[0017] The locking nut is tightened, and the ring sample can be clamped between the locking nut and the step.

[0018] Further, the rotating drive device comprises a shaft bearing fixed on the rack and a servo motor, 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 rotationally connected to the rack through the shaft bearing.

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

[0020] The shear jack is fixed on the rack, the fixed support is fixed on the top of the shear jack, the guide rod is vertically fixed on the fixed support, the top end of the guide rod is slidably connected to the linear bearing, and the spring is fixedly connected to the fixed support and the linear bearing at both ends.

[0021] Further, the detection device further comprises a lower support table, an upper support table and a sensor mounting platform;

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

[0023] Further, the block sample mounting table comprises a block sample placing groove, a support, a box-shaped sliding block and an optical shaft.

[0024] The two oppositely arranged supports are fixed at the bottom of the block sample placing groove, the optical shaft is fixedly connected with the supports at two ends, the two ends of the optical shaft abut against the two oppositely arranged friction force sensors, the box-shaped sliding block is fixed on the sensor mounting platform, the box-shaped sliding block is located between the two supports, and the optical shaft is slidably connected with the sensor mounting platform through the box-shaped sliding block.

[0025] Further, the vertical loading device further comprises a connecting piece, a sliding block and a guide rail vertically arranged on the rack.

[0026] The sliding block is arranged on the guide rail, and the sliding block is fixedly connected with the lower support table through the connecting piece.

[0027] Further, a mercury slip ring is further arranged at the end of the main rod body away from the end of the servo motor.

[0028] Beneficial effects:

[0029] The vertical loading device provides a vertical loading force, the rotating driving device drives the ring sample mounting rod to rotate forward and reverse, 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 rotary friction pair and a swing friction pair, the two oppositely arranged friction force sensors on the detection device can not only measure the friction force value of rotary friction, but also measure the friction force value of swing friction, the electric field shielding box is arranged, so that the testing machine can simulate the friction phenomenon of the sample under the condition of shielding external electric field interference, provides a test basis for studying the relationship between the friction wear state and the triboelectric effect, and enables the tester to study the triboelectric effect and the friction wear state of the rotary friction pair or the swing friction pair. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0031] Figure 1 This is a schematic diagram of the structure of a rotary friction and wear testing machine with electric field shielding, disclosed in this invention, showing the removal of the electric field shielding box.

[0032] Figure 2 This is a schematic diagram of the structure of an electric field shielded rotary friction and wear testing machine disclosed in this invention;

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

[0034] Figure 4 This is a schematic diagram showing the assembly of the ring sample mounting rod, the testing device, and the block sample mounting platform of an electric field shielded rotary friction and wear testing machine disclosed in this invention.

[0035] Figure 5 This is a schematic diagram of the block sample mounting platform of an electric field shielded rotary friction and wear testing machine disclosed in this invention;

[0036] Figure 6 This is a schematic diagram of the testing device of an electric field shielded rotary friction and wear testing machine disclosed in this invention;

[0037] Figure 7 This is a schematic diagram illustrating the cooperation between the testing device and the vertical loading device of an electric field shielded rotary friction and wear testing machine disclosed in this invention. Figure 1 ;

[0038] Figure 8 This is a schematic diagram illustrating the cooperation between the testing device and the vertical loading device of an electric field shielded rotary friction and wear testing machine disclosed in this invention. Figure 2 ;

[0039] Figure 9 This is a schematic diagram of the vertical loading device of an electric field shielded rotary friction and wear testing machine disclosed in this invention;

[0040] Figure 10 This is a cross-sectional schematic diagram of the vertical loading device of an electric field shielded rotary friction and wear testing machine disclosed in this invention;

[0041] Figure 11 This is a schematic diagram of the frame structure of an electric field shielded rotary friction and wear testing machine disclosed in this invention.

[0042] In the picture:

[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. Rotary drive unit; 21. Mounted 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. Sliding block; 47. Guide rail; 48. Connecting parts;

[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. Semi-circular head bolt;

[0048] 6. Block sample mounting platform; 61. Block sample placement slot; 62. Bracket; 63. Box-type slider; 64. Optical axis;

[0049] 7. Electric field shielding box. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] This embodiment provides an electric field-shielded rotary friction and wear testing machine, such as... Figure 1 and Figure 2 As shown, it includes:

[0052] Rotary drive device 2, which can drive the ring sample mounting rod 3 to rotate forward and backward;

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

[0054] The vertical loading device 4 can drive the block sample mounting platform 6 to move vertically up and down, 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 adjust the magnitude of the vertical loading force by moving vertically up and down.

[0055] The detection device 5 is disposed between the vertical loading device 4 and the block sample mounting platform 6, such as... Figure 4 andFigure 6 As shown, the detection device 5 comprises a loading force sensor 54 for detecting the vertical loading force and two oppositely arranged friction force sensors 55, 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 for measuring the vertical loading force when the block sample and the ring sample are in contact, and the friction force sensor 55 is used for detecting the friction force value when the block sample and the ring sample rotate or swing;

[0056] The block sample mounting table 6 can be used to mount the block sample;

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

[0058] In the 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 electric field shielding rotary friction and wear testing machine provided by the embodiment can provide vertical loading force through the vertical loading device 4, drive the ring sample mounting rod 3 to rotate forward and reverse through the rotary driving device 2, make the ring sample on the ring sample mounting rod 3 rotate relative to the block sample on the block sample mounting table 6, so as to make the ring sample and the block sample simulate the rotary friction pair and the swing friction pair, the two oppositely arranged friction force sensors 55 on the detection device 5 can not only measure the friction force value of the rotary friction, but also measure the friction force value of the swing friction, the electric field shielding box 7 is arranged, so that the testing machine can simulate the friction phenomenon of the sample under the condition of shielding the external electric field interference, provide a test basis for studying the relationship between the friction and wear state and the triboelectric effect, and make the test personnel be able to study the triboelectric effect and the friction and wear state of the rotary friction pair or the swing friction pair.

[0060] In specific embodiments, as shown in Figure 1 and Figure 2 The rack 1 is further provided with the rotary driving device 2 and the vertical loading device 4.

[0061] In specific embodiments, as shown in Figure 3 and Figure 4 The ring sample mounting rod 3 comprises 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 with the main rod body 31, and the ring sample can be sleeved on the main rod body 31.

[0063] Tighten the locking nut 33, and the ring sample 32 can be clamped between the locking nut 33 and the step 34.

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

[0065] In a specific embodiment, such as Figure 9 and Figure 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 end of the guide rod 42 is slidably connected to the linear bearing 44, and the two ends of the spring 43 are welded and fixed to the fixed support 41 and the linear bearing 44 respectively.

[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 can be raised or lowered, thereby changing the magnitude of the loading force when the ring sample and the block sample are in contact, and thus changing the friction force when the ring sample and the block sample rotate or swing.

[0068] In a specific embodiment, such as 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 both ends of the loading 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 to the top of the upper support platform 52 by bolts. The friction force sensor 55 is mounted on the sensor mounting platform 53 by a sensor bracket 56. 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 adjustment of the position of the sensor bracket 56.

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

[0071] Two opposite said support 62 is fixed by bolt in block sample placement groove 61 bottom, the optical axis 64 both ends with support 62 through bolt fixed connection, the optical axis 64 both ends with two opposite friction force sensor 55 abut, the box slider 63 is fixed on the sensor mounting platform 53 through bolt, the box slider 63 is located between two support 62, the optical axis 64 through the box slider 63 and sensor mounting platform 53 on the sliding connection;

[0072] Ring sample installation rod 3 and block sample installation platform 6 make ring sample and block sample can be quickly replaced, so as to replace block sample and ring sample into different friction electrical properties according to the needs of different test;

[0073] When block sample and ring sample rotate friction or swing friction, the friction force received by block sample is transmitted to the optical axis 64 which can move horizontally relative to the sensor mounting platform 53, and the friction force between block sample and ring sample is measured by the close contact of the optical axis 64 and the friction force sensor 55. Specifically, when the optical axis 64 is in contact with and pressed against the friction force sensor 55, the friction force sensor 55 can obtain the value of the force, thereby detecting the friction force. During continuous friction, the optical axis 64 is always pressed against the friction force sensor 55, thereby detecting the change of the friction force between block sample and ring sample within a period of time.

[0074] On both sides of the optical axis 64 are provided with friction force sensors 55, which cooperate with the reversible servo motor 22 to make the motion form of the tester more diversified. Not only can the rotation friction of block sample and ring sample be realized (the servo motor 22 remains forward or reverse rotation), but also the swing friction of block sample and ring sample can be realized (the servo motor 22 alternately runs forward and reverse), thereby detecting the swing friction.

[0075] In a specific embodiment, as shown in Figure 8 The vertical loading device 4 further comprises a connecting piece 48, a sliding block 46 and a guide rail 47 vertically arranged on the rack 1.

[0076] The sliding block 46 is arranged on the guide rail 47, and the sliding block 46 is fixedly connected with the lower support table 51 through the connecting piece 48. In this embodiment, the connecting piece 48 is L-shaped, and the connecting piece 48 is fixedly connected with the sliding block 46 and the lower support table 51 through fasteners.

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

[0078] In a specific embodiment, as shown in Figure 3 andFigure 4 As shown, the main rod body 31 is provided with a mercury slip ring 35 at one end away from the servo motor 22, the mercury slip ring 35 is threadedly connected with the main rod body 31, and is used to conduct the friction current generated by the friction between the block sample and the ring sample.

[0079] In specific embodiments, as shown in Figure 4 and Figure 7 As shown, the bottom of the lower support table 51 is provided with a half-round head bolt 57, the head of the half-round head bolt 57 can abut the top of the linear bearing 44, and the head of the half-round head bolt 57 is located at the end of the inner hole of the linear bearing 44.

[0080] In specific embodiments, as shown in Figure 11 As shown, the rack 1 is provided with a detachable motor support plate 11, a vertical support plate 12, a bearing support plate 13 with seat, a jack support plate 14 and a cross beam 15, the motor support plate 11 is connected with the servo motor 22 through bolts, the vertical support plate 12 is connected with the guide rail 47 through bolts, the bearing support plate 13 with seat is connected with the bearing 21 with seat through bolts, the jack support plate 14 is connected with the shear jack 45 through bolts, and the motor support plate 11 and the bearing support plate 13 with seat are provided with a waist-shaped hole to facilitate the position adjustment of the servo motor 22 and the bearing 21 with seat;

[0081] In this embodiment, the rack 1 and the cross beam 15 are made of industrial aluminum profiles, the motor support plate 11, the bearing support plate 13 with seat, the jack support plate 14 and the cross beam 15 are arranged on the rack 1 through T-shaped bolts, the vertical support plate 12 is arranged on the cross beam 15 through T-shaped bolts, the T-shaped bolts slide in the sliding groove of the industrial aluminum profile, and the flange nut sleeve is connected on the T-shaped bolt;

[0082] The flange nut is loosened, the T-shaped bolt slides in the sliding groove of the industrial aluminum profile, and the relative positions of the motor support plate 11, the vertical support plate 12, the bearing support plate 13 with seat, the jack support plate 14, the cross beam 15 and the rack 1 are adjusted.

[0083] During the test, first, the electric field shielding box 7 is removed, different block samples and ring samples of different electrical properties are selected and respectively installed on the ring sample installation rod 3 and placed in the groove of the block sample placing groove 61, the shear jack 45 is adjusted to make the block sample and the ring sample contact, then the height of the shear jack 45 is adjusted again, the required loading force is obtained according to the reading of the loading force sensor 54, and then the electric field shielding box 7 is installed.

[0084] When the friction and wear test is carried out, the servo motor 22 is started, the servo motor encoder is used to adjust the motion form, speed, frequency, etc. of the servo motor 22, the main rod body 31 is driven to rotate through the shaft coupling 23, the ring sample is rotated relative to the block sample, and the rotary friction or swing friction and wear test is realized, the mercury slip ring 35 can be connected to the electrometer to collect the friction current and voltage, and the correlation between the tribology and the triboelectricity when the block sample and the ring sample are rubbed is studied.

[0085] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An electric field shielded rotary friction and wear tester characterized by, The application relates to a ring and block sample testing device. The device comprises a rotary driving device (2) capable of driving a ring sample mounting rod (3) to rotate forward and reversely; the ring sample mounting rod (3) is capable of mounting a ring sample; a vertical loading device (4) is capable of driving a block sample mounting table (6) to vertically lift, so that a block sample on the block sample mounting table (6) and the ring sample on the ring sample mounting rod (3) abut against each other to apply a vertical loading force, and the vertical loading force is adjusted in size by vertical lifting; a detection device (5) is arranged between the vertical loading device (4) and the block sample mounting table (6), the detection device (5) comprises a loading force sensor (54) and two oppositely arranged friction force sensors (55), the loading force sensor (54) is used for detecting 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; the block sample mounting table (6) is capable of mounting a block sample; an electric field shielding box (7) is placed above a rack (1), and the block sample mounting table (6) and the ring sample mounting rod (3) are located in the electric field shielding box (7); the device further comprises the rack (1), and the rotary driving device (2) and the vertical loading device (4) are arranged on the rack (1); the vertical loading device (4) comprises a fixed support (41), a guide rod (42), a spring (43), a linear bearing (44) and a shear type jack (45); the shear type jack (45) is fixed on the rack (1), the fixed support (41) is fixed on the top of the shear type jack (45), the guide rod (42) is vertically fixed on the fixed support (41), the top end of the guide rod (42) is slidably connected with the linear bearing (44), and the two ends of the spring (43) are fixedly connected with the fixed support (41) and the linear bearing (44) respectively; the detection device (5) further comprises a lower support table (51), an upper support table (52) and a sensor mounting platform (53); the lower support table (51) and the upper support table (52) are fixed at the two ends of the loading force sensor (54) respectively, the lower support table (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 table (52), and the friction force sensor (55) is arranged on the sensor mounting platform (53); the block sample mounting table (6) comprises a block sample placing groove (61), a support (62), a box type sliding block (63) and an optical axis (64). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Two opposite said support (62) is fixed in the block sample placement groove (61) bottom, the optical axis (64) both ends and support (62) fixed connection, the optical axis (64) both ends end and two opposite friction sensor (55) abut, the box slider (63) is fixed on the sensor mounting platform (53), the box slider (63) is located between two support (62), the optical axis (64) through the box slider (63) and sensor mounting platform (53) on the sliding connection.

2. The electric field shielded rotary friction and wear machine of claim 1, wherein, 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); Tighten the locking nut (33), the ring sample can be clamped between the locking nut (33) and the step (34).

3. The electric field shielded rotary friction and wear machine of claim 2, wherein, The rotating drive device (2) comprises a bearing with seat (21) and a servo motor (22) fixed on the rack (1), one end of the main rod body (31) is connected with the output shaft of the servo motor (22), and the other end of the main rod body (31) is rotatably connected with the rack (1) through the bearing with seat (21).

4. The electric field shielded rotary friction and wear machine of claim 1, wherein, The vertical loading device (4) further comprises a connecting piece (48), a sliding block (46) and a guide rail (47) vertically arranged on the rack (1); The sliding block (46) is arranged on the guide rail (47), and the sliding block (46) is fixedly connected with the lower support table (51) through the connecting piece (48).

5. The electric field shielded rotary friction and wear machine of claim 3, wherein, Further comprising a mercury slip ring (35), the mercury slip ring (35) is arranged at one end of the main rod body (31) away from the end of the servo motor (22).

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