Friction force testing device for lubricant

Abstract

The invention discloses a friction force testing device for a lubricant, and belongs to the technical field of oil and gas field exploitation assistant detection. A lubricant is arranged on a test board, a test block is connected with a driving assembly through a detection assembly, the driving assembly drives the test block to move linearly, and the value of driving force is detected through the detection assembly; a rectangular shallow groove is formed in the test table, a lubricant to be tested is contained in the shallow groove, the test block is of an inverted-cone-shaped blocky structure, a plurality of protruding parts are arranged at the bottom end of the test block, and the bottom end faces of the protruding parts are in smooth fit contact fit with the groove bottom of the shallow groove; the driving assembly comprises a hanging part capable of linearly moving in the length direction of the shallow groove, the hanging part and the test block are connected together in a hanging mode through a vertically-pluggable inserting pin, and the hanging part moves from one side of the test table to the other side of the test table in the length direction of the shallow groove. The device can quickly and reliably test the frictional resistance of the lubricant, and is high in adaptability.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas field mining auxiliary agent detection, and in particular relates to a friction force testing device for a lubricant. Background Art

[0002] In the current implementation of domestic oilfield projects, common lubricants are too limited and can only partially reduce friction resistance, which is not targeted and efficient. In addition, the concentration of traditional drilling fluid will continue to decrease with the depth of the well, seriously affecting the drilling efficiency. The microcapsule-type speed-up and anti-stuck lubricant currently under development releases lubricating materials of different concentrations at different friction points or shear points in a targeted manner, solves the bottleneck problem through encapsulation technology, and produces microcapsule-type materials to improve the friction problem in the mining process.

[0003] In order to better demonstrate the drag-reducing effect of the lubricant contained in it and facilitate further lubrication research on the encapsulated lubricant, special experimental equipment is urgently needed to simulate and analyze the dynamic friction coefficient between the pipeline drill bit and the well wall during the drilling process, simulate and analyze the stress conditions, and the dynamic friction coefficient before and after adding the lubricant to demonstrate the lubrication effect.

[0004] Existing friction testing equipment is for testing the friction of thin films, and cannot be used to indirectly test the friction coefficient of liquids. Traditional testing methods mainly include mud cake adhesion coefficient tester, extreme pressure lubrication tester, and mud cake viscosity coefficient tester. The problems with these traditional instruments are: using trigonometric functions to calculate data is relatively complicated, and the estimated values ​​of trigonometric functions themselves are not accurate enough. In addition, they cannot meet the weight and stress size during underground operations. Traditional operations are too cumbersome and torque adjustment is troublesome. In addition, ventilation and pressurization are required during testing, and the ventilation and pressurization simulation process is dangerous. Summary of the invention

[0005] In view of the introduction to the above technical status, the purpose of the present invention is to provide a friction test device for a lubricant. The friction test device for a lubricant fills the gaps in the friction coefficient detection method for microcapsule-type speed-up and anti-stuck lubricants and some encapsulated liquid materials, as well as the lack of friction detection instruments for lubricating encapsulated materials, providing a reference for subsequent research and development of liquid friction coefficient determination.

[0006] To achieve the above-mentioned purpose, the present invention adopts a lubricant friction test device, including a test bench and a test block, the test block slides linearly on the test bench, the test bench is filled with lubricant, the test block is connected to a driving component through a detection component, the driving component moves linearly with the test block, and the value of the driving force is detected by the detection component; a rectangular shallow groove is opened on the test bench, the shallow groove is filled with lubricant to be tested, the test block is an inverted cone-shaped block structure, the bottom end of the test block has a plurality of protrusions, the bottom end surface of the protrusions is smoothly fitted and contacted with the bottom of the shallow groove; the driving component includes a hanging component that can move linearly along the length direction of the shallow groove, the hanging component and the test block are hung together by a vertical plug-in pin, and the hanging component moves from one side of the test bench to the other side along the length direction of the shallow groove.

[0007] Furthermore, the drive assembly also includes an L-shaped drive arm, the horizontal arm of the drive arm is located above the test bench, and the vertical arm is slidably installed against the back of the test bench and fixedly connected to a threaded block through a sliding column. The threaded block is threadedly fitted on a lead screw, and the lead screw is rotatably installed in the test bench.

[0008] Furthermore, the vertical arm is provided with a plurality of adjusting screws perpendicular to it, and the sliding column is linearly slidably installed in a sliding groove on the back of the test bench. After the adjusting screw is threadedly connected with the vertical arm and penetrates through it, it extends into a sliding block in the sliding column. The sliding block slides vertically in the sliding column without separating from the sliding column. One end of the adjusting screw rotatably located in the sliding block is a T-shaped structure, so that when the adjusting screw is turned, the T-shaped structure can axially press against the sliding block to achieve the fixed connection between the vertical arm and the sliding column.

[0009] Furthermore, the shallow groove has a rectangular cross-sectional structure, and the hanging component on the shallow groove includes a hanging column connected to the horizontal arm, and a pulling column fixed to the side of the test block. The pulling column and the hanging column are each provided with a socket, and when the two sockets are connected up and down, the plug pin is vertically inserted into them, so that the hanging column moves in a straight line with the pulling column.

[0010] Furthermore, a section of the pull column and the hanging column that are opposite to each other up and down has a plane on both the upper and lower sides, and the insertion hole is provided at the position where the plane is located.

[0011] Furthermore, the horizontal arm includes a forearm and a rear arm that are relatively arranged. The forearm is arranged against the shallow groove, and the two arms are assembled together by plug-in cooperation with a positioning sleeve. One end of the hanging column is fixedly inserted into the forearm and connected to a mechanical sensor through a tension spring. The mechanical sensor is arranged in the rear arm and moves with the rear arm. The rear arm is fixedly connected to the vertical arm, while the forearm is not connected to the vertical arm.

[0012] Furthermore, the mechanical sensor includes a core column coaxially facing the hanging column, the two are connected by the tension spring, and the rear arm and the core column are axially slidably connected; the mechanical sensor also includes an insulating rod arranged parallel to the core column, and a resistance wire is spirally wound on the insulating rod, one end of the resistance wire is connected to a test circuit, and two adjacent turns of the resistance wire do not contact each other or are insulated from each other; an insulating ring sleeve is also installed on the core column, and a conductive element is fixed on the insulating ring sleeve, and the conductive element can always contact with a certain surface of the resistance wire in a sliding manner, and the conductive element is connected to the test circuit, when the rear arm moves away from the forearm, the tension spring is stretched, and the resistance wire slides horizontally relative to the conductive element to change the contact position of the conductive element and the resistance wire, and then the resistance of the corresponding length of the resistance wire is connected to the test circuit.

[0013] Furthermore, the conductive element is an elastic telescopic structure, which can be extended and retracted along the radial direction of the insulating rod and always maintain an elastic extrusion state therewith.

[0014] Furthermore, a movable disk is coaxially fixed on the hanging column, and the movable disk is axially movably installed in the forearm, and a driving disk is rotatably installed in the front side of the forearm, and the driving disk is rotatably installed around the hanging column, and the inner surface of the driving disk is an internal gear structure, and the internal gear is meshed with a plurality of rod-shaped gears in an annular array on the inner side thereof, and a stud is coaxially fixed at one end of the rod-shaped gear, and the stud is threadedly inserted into the forearm and is rotatably connected to the movable disk, so that when the driving disk is rotated, all the studs are synchronously axially moved to bring the movable disk to axially translate; It also includes a right-angle rod, one end of which is fixed to the inner wall of the mounting hole where the hanging column is located, and the other end of which is coaxially fixed to the end surface of the core column, so that the forearm and the core column are connected as a whole.

[0015] Furthermore, the outer wall of the driving disk is provided with a thread to cooperate with the threaded mounting hole on the forearm, and a compressed conical spring is provided between the end face of the driving disk and the bottom of the threaded hole, and all the rod-shaped gears are located on the inner side of the conical spring; a hexagonal groove is coaxially provided on the outer bottom end face of the driving disk for a hexagonal wrench to be inserted to rotate the driving disk, and the end face of the hexagonal wrench has an accommodating cavity that can accommodate the rod-shaped gears.

[0016] The friction force testing device of a lubricant of the present invention uses the force application surface of a slider to simulate the stress of downhole drilling tools, and through sliding tests, relies on the motion friction coefficient, squeezes liquid between the slider and the plane, and performs motion tests, mainly simulating the impact of lubricating liquid on drilling tools in actual use, and judging its lubrication effect through the changes in static friction and dynamic friction factors. That is, this method pioneers friction resistance tests for liquid materials such as microcapsule lubricants, pioneers liquid friction resistance and friction coefficient tests, and provides a reference for subsequent liquid and other fluid friction coefficient tests; setting up shallow grooves makes it easier to conduct liquid tests, and the unique inverted cone slider can make stress more concentrated, more effectively calculate stress size, and infer simulated downhole data, making this processing method simple and easy to use, and has a good value for promotion and use.

[0017] Specifically, conventional tribometers cannot provide the friction resistance generated by downhole drilling tools. For this reason, the present invention optimizes the design of the slider that generates pressure, giving the slider a special inverted cone shape, and increasing the weight of the slider itself by 2kg, 3kg, and 5kg to make it more targeted at lubricants.

[0018] At the same time, due to the increase in the size of the customized slider, the height of the corresponding detection system sensor was adjusted, and the height of the manually adjustable drive arm based on the adjusting screw was set to adapt to sliders with different weight gradients to ensure the accuracy of the experiment.

[0019] In order to maintain the operation of the detection system and keep the overall stability of the system, the overall weighing parameters can be adjusted to adapt to the heavy weight slider, for example, the inverted cone test block can be made into a combined assembly type and multi-layer splicing.

[0020] The present invention is designed as a whole based on the lubricity of the lubricant. In order to adapt to the detection of liquid lubricants, a groove on the equipment table is customized to carry the liquid, prevent the liquid from overflowing, and ensure that the detection is carried out normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following are auxiliary illustrations for explaining some specific embodiments of the present invention. The drawings described are mainly the principles of the specific operation execution structures or methods of some embodiments of the present invention. However, this does not mean that the physical structure or operation steps of the present invention can only be as shown in the drawings.

[0022] Figure 1 It is a schematic diagram of the overall appearance of the present invention; Figure 2 It is a partial appearance schematic diagram of the present invention; Figure 3 It is the internal structure diagram of the horizontal arm; Figure 4 It is a partial cross-sectional view of the matching structure of the driving arm and the test bench; Figure 5 is a bottom view of the test block; Figure 6 It is a structural schematic diagram of a hanging component; Figure 7 yes Figure 3 A magnified view of the structure at center; Figure 8 yes Figure 3 A magnified view of the structure at B in the middle; Fig. 9 It is a schematic diagram of the right end face of the drive disk; Fig.10 It is a schematic diagram of the end face of a hexagonal wrench; Fig.11 It is a partial principle schematic diagram of a test circuit.

[0023] Component number explanation: test bench 1, shallow groove 2, test block 3, protrusion 301, drive arm 4, horizontal arm 401, forearm 40101, rear arm 40102, vertical arm 402, sliding column 5, threaded block 6, lead screw 7, adjusting screw 8, slider 9, T-shaped structure 10, hanging column 11, hexagonal groove 12, pull column 13, plug pin 14, core column 15, resistance wire 16, insulating ring sleeve 17, insulating rod 18, conductive element 19, tension spring 20, right-angle rod 21, positioning sleeve 22, moving disk 23, stud 24, rod gear 25, drive disk 26, conical spring 27, accommodating chamber 28. DETAILED DESCRIPTION

[0024] The embodiments of the present invention will be fully described below, and some core features of the embodiments will be specifically shown in the accompanying drawings, wherein the same or similar reference numerals in the drawings represent the same or similar technical features, or structures or steps or processes with similar functions. Other embodiments replaced by ordinary technicians based on these embodiments without the need for creative work also belong to the protection scope of the present invention.

[0025] See also Figure 1 The device for testing the friction force of a lubricant mainly comprises a test bench 1 and a test block 3. The test block 3 slides linearly on the test bench 1. The test bench 1 is filled with lubricant. The test block 3 is connected to a driving component through a detection component. The driving component moves the test block 3 linearly and detects the value of the driving force through the detection component. Then, according to the fact that the friction force is equal to the friction coefficient multiplied by the normal pressure, that is, multiplied by the gravity of the test block 3, the corresponding friction factor can be calculated. Specifically, a rectangular shallow groove 2 is provided on the test bench 1. The shallow groove 2 is filled with the lubricant to be tested. The test block 3 is an inverted cone-shaped block structure. The small end of the test block 3 faces downward, and there are several protrusions 301 at the bottom end of the test block 3. The protrusions 301 can be as follows. Figure 5As shown, there are rectangular protrusions at the four corners. The bottom end surface of the protrusion 301 is in smooth contact with the bottom of the shallow groove 2, which can increase the friction force. Specifically, the driving component used includes a hanging component that can move linearly along the length of the shallow groove 2. The hanging component is used because direct hanging can ensure that the test block 3 is fully placed in the shallow groove 2 and in contact with the bottom of the groove, so as to accurately measure the friction resistance. In practice, between the hanging component and the test block 3, as shown in FIG. Figure 6 , they are specially hung together by a vertical plug-in pin 14, and this hanging component can move from one side of the test bench 1 to the other side along the length direction of the shallow groove 2 to achieve a test.

[0026] In a specific embodiment, Figure 1-Figure 2 as well as Figure 4 The driving assembly also includes an L-shaped driving arm 4, the horizontal arm 401 of which is located above the test bench 1, and the vertical arm 402 of which is slidably installed against the back of the test bench 1, and the sliding direction is consistent with the length direction of the shallow groove 2. Figure 4 A sliding column 5 is shown to be fixedly connected to a threaded block 6, and the threaded block 6 is threadedly sleeved on a lead screw 7, and the lead screw 7 is rotatably installed in the test bench 1. A corresponding micro motor is installed inside the test bench 1 to drive the lead screw 7 to rotate, thereby forming a lead screw mechanism, which moves the driving arm 4 in a straight line, and then realizes the test block 3 in the shallow groove 2, under the action of the lubricant, to slide in a straight line.

[0027] Continue reading Figure 4 In this embodiment, a plurality of adjusting screws 8 are provided on the vertical arm 402 and are perpendicular thereto. The sliding column 5 is linearly slidably installed in the slide groove on the back of the test bench 1. Specifically, the adjusting screw 8 is threadedly connected and penetrated with the vertical arm 402, fixed to the driving arm 4 as a whole, and then extended into a slider 9 in the sliding column 5. The slider 9 slides vertically in the sliding column 5 without separating from the sliding column 5. One end of the adjusting screw 8 is rotatably located in the slider 9 as a T-shaped structure 10 so that the adjusting screw 8 will not be completely screwed out. When the adjusting screw 8 is screwed, the T-shaped structure 10 can axially press against the slider 9, thereby realizing the fixed connection between the vertical arm 402 and the sliding column 5, and then adjusting the installation height position of the driving arm 4 to adapt to the test of test blocks 3 of different sizes.

[0028] Specifically, if Figure 4 The shallow groove 2 is a rectangular cross-sectional structure, and the hanging parts on the shallow groove 2 include a hanging column 11 connected to the horizontal arm 401, and Figure 2 As shown, Figure 6The structure shown has a pull post 13 fixed on the side of the test block 3. The pull post 13 and the hanging post 11 are each provided with a socket. When the two sockets are connected up and down, the plug pin 14 is vertically inserted, so that the hanging post 11 moves straight with the pull post 13. During processing and manufacturing, the socket is just enough for the plug pin 14 to slide vertically and easily. The fit should not be too tight, otherwise it may cause the test block 3 to fail to fully contact the bottom of the shallow groove 2, resulting in inaccurate detection. Figure 6 As shown, in order to facilitate hanging, the upper and lower sides of the pull column 13 and the hanging column 11 that are opposite to each other have a plane, and the position where the plane is located is provided with a plug hole.

[0029] As a specific embodiment of the detection component, it adopts a structure of a combined horizontal arm 401, for example, the horizontal arm 401 includes a front arm 40101 and a rear arm 40102 arranged opposite to each other, the front arm 40101 is arranged by the shallow groove 2, and the two arms are assembled together by plugging and matching through a positioning sleeve 22. Specifically, the positioning sleeve 22 is axially smoothly plugged and contacted with the front arm 40101, and one end of the hanging column 11 is fixedly inserted into the front arm 40101 and connected to a mechanical sensor through a tension spring 20. This mechanical sensor is arranged on the rear arm 40102, and moves with the rear arm 40102, the rear arm 40102 is fixedly connected to the vertical arm 402, and the forearm 40101 is not connected to the vertical arm 402, so that during detection, when the driving arm 4 moves, the rear arm 40102 moves first, causing the rear arm 40102 and the forearm 40101 to gradually separate, and in this process, the tension spring 20 is stretched, and the tension of the tension spring 20 can be detected by the mechanical sensor connected thereto, and then the aforementioned method is installed to calculate the friction coefficient of the test block 3 when moving when the respective lubricants are present.

[0030] In specific practice, Figure 3 As shown, this mechanical sensor uses a special electrical signal form to display the detection value. Specifically, it mainly includes a core column 15 coaxially facing the hanging column 11, and the two are connected by a tension spring 20. The rear arm 40102 is axially slidably connected to the core column 15, that is, the rear arm 40102 can slide axially relative to the core column 15. The mechanical sensor also includes an insulating rod 18 arranged parallel to the core column 15. The insulating rod 18 is spirally wound with a resistance wire 16. One end of the resistance wire 16 is connected to a test circuit. Two adjacent turns of the resistance wire 16 do not contact each other or are insulated from each other, so that the conductive element 19 mentioned later contacts a specific part of the resistance wire 16, so that the corresponding section of the resistance wire 16 is connected to the circuit. Specifically, as Figure 3 and Figure 7As shown, an insulating ring sleeve 17 is also installed on the core column 15, and a conductive element 19 is fixed on the insulating ring sleeve 17, and the conductive element 19 can always contact with a certain surface of the resistance wire 16 in a sliding manner. It should be noted that the resistance wire 16 is preferably only in contact with one or two turns, so that it is easier to more accurately determine the length of the connected resistance wire 16. If multiple turns, such as 10 turns, are in contact at the same time, then the length of the 10 turns of the resistance wire 16 will cause a large evaluation and calculation error, so it is best to only contact 1-2 turns. In addition, the above-mentioned conductive element 19 is also connected to the test circuit. When the rear arm 40102 is away from the front arm 40101, the tension spring 20 is stretched, and the resistance wire 16 slides horizontally relative to the conductive element 19 to change the contact position of the conductive element 19 and the resistance wire 16. Then, the resistance of the resistance wire 16 at the corresponding length is connected to the test circuit, and the resistance value is obtained by using a test circuit such as the volt-ampere method to measure resistance. For example, according to Fig.11 The circuit diagram shown is used to measure and calculate the resistance of the resistor 16. I=U / R is used. I and U are measured by an ammeter and a voltmeter respectively, and R=U / I is calculated. Then, based on the value of R, the length of the resistor 16 connected to the circuit at this time can be calculated. Moreover, based on the pitch and number of turns of the spiral winding of the resistor 16, it can be determined where the conductive element 19 contacts the resistor 16 at that time. This position can be compared and calculated with the position at which the resistor 16 contacts the conductive element 19 at the initial moment, thereby determining the relative translation displacement of the entire insulating rod 18 and the rear arm 40102. This displacement is equal to the stretched length of the tension spring 20 during the test. Then, based on the spring stiffness coefficient, the elastic force F=k*x is calculated, where k is the stiffness coefficient and x is the stretched length of the tension spring 20 during the test. Then, the friction coefficient is cleverly calculated.

[0031] In order to ensure reliable contact between the conductive element 19 and the surface of the resistance wire 16, the conductive element 19 is specially processed into an elastic telescopic structure, which can be extended and retracted along the radial direction of the insulating rod 18 and always maintain an elastic extrusion state therewith to maintain the reliability of the connection and conduction.

[0032] In practice, in order to improve the static friction test of friction resistance, or the critical friction value of the test block 3 from static to moving under given lubricant conditions, the driving arm 4 moves as small as possible, that is, the tension spring 20 needs to have a larger initial elastic force when tested at the initial moment, and the initial stretching amount of the tension spring 20 needs to be adjusted, for example, the initial stretching degree is increased. In view of this, in this embodiment, if Figure 3 and Figure 8A movable disk 23 is coaxially fixed on its hanging column 11, and this movable disk 23 is axially movably installed in the forearm 40101, and a driving disk 26 is rotatably installed in the front side of the forearm 40101. The driving disk 26 is rotatably installed around the hanging column 11, and the inner surface of the driving disk 26 is an internal gear structure, that is, an internal gear ring, and the internal gear is meshed with a plurality of rod-shaped gears 25 on the inner side of the annular array. The rod-shaped gear 25 refers to a gear with extremely thick thickness and a spline shape. A stud 24 is coaxially fixed at one end of the rod-shaped gear 25, and the stud 24 is threadedly inserted into the forearm 40101 and is rotatably connected to the movable disk 23. In this way, when the driving disk 26 is rotated, all the studs 24 can move axially synchronously to lead the movable disk 23 to translate axially, which can maintain the movable disk 23 to translate well, avoid local deflection and jamming, and better maintain the trend of axial pulling of the tension spring 20. The rod-shaped gear 25 is specially designed to achieve the special motion requirement of rotating and meshing while moving axially.

[0033] As an important design structure, such as Figure 3 This embodiment also includes a right-angle rod 21, one end of which is fixed to the inner wall of the mounting hole where the hanging column 11 is located, and the other end of which is coaxially fixed to the end face of the core column 15, so that the front arm 40101 and the core column 15 can be connected as a whole, allowing the rear arm 40102 and its resistance wire 16 to move more smoothly and axially relative to the front arm 40101 and the core column 15.

[0034] In order to ensure that the drive disk 26 always maintains a relatively tight state during adjustment, such as Figure 3 and Figure 8 The outer wall of the driving disk 26 is provided with threads, which can be threadedly matched with the threaded mounting hole on the forearm 40101, and a compressed conical spring 27 is specially provided between the end face of the driving disk 26 and the bottom of the threaded hole, so as to pre-tighten the driving disk 26 at all times, and all the rod-shaped gears 25 are located on the inner side of the conical spring 27. In order to facilitate the rotation of the driving disk 26, it is necessary to have a spring on the outer bottom end face of the driving disk 26, such as Figure 8-9 , a hexagonal groove 12 is coaxially provided so that a hexagonal wrench can be inserted to rotate the drive disk 26, and as Fig.10 As shown, the end face of the hexagonal wrench has an accommodating cavity 28 capable of accommodating the rod-shaped gear 25 so as not to be interfered with by the rod-shaped gear 25 or the like.

[0035] As an auxiliary example, the various functional design structures in the above embodiments can be integrated with the corresponding calculation modules to obtain a more complete test device, that is, the above algorithm is programmed to obtain the corresponding calculation detection module. When in use, the lubricant sample to be tested, that is, the corresponding lubricant, can be poured into the groove plane, the friction coefficient meter can be turned on, and the parameters can be set; the lubricant and the test block 3 can be pre-treated to ensure that the lubricant is evenly distributed on the surface of the groove tray, and the inverted cone test block 3 is pressed on the evenly distributed liquid lubricant; the preset weight test block 3 is placed on the hook without impact, and the test block 3 is parallel to the movement direction of the drive arm 4. It is best to make the system composed of the test block 3 just unstressed or return to zero force at the initial moment, and connect the test block 3 to the mechanical sensor. You can also click to run the test in the adaptive design software module interface. After the test, remove the slider 9 and click to return to the position. The purpose is to protect the mechanical sensor. Finally, the instrument statistically analyzes the experimental results and prints them.

[0036] The above series of specific implementation details are merely some preferred embodiments of the present invention and cannot be used to limit the protection scope of the claims of the present invention. A person skilled in the art can simply change the design ideas based on the understanding of the above embodiments and the reference to the basic principles recorded in the claims of the present invention. However, these design changes still fall within the protection scope of the invention.

Claims

1. A friction force testing device for lubricants, comprising a test bench (1) and a test block (3), wherein the test block (3) slides linearly on the test bench (1), the test bench (1) is provided with lubricants, the test block (3) is connected to a driving component via a detection component, the driving component moves the test block (3) linearly, and the detection component detects the value of the driving force, characterized in that: The test bench (1) is provided with a rectangular shallow groove (2), wherein the shallow groove (2) contains a lubricant to be tested; the test block (3) is an inverted cone-shaped block structure; the bottom end of the test block (3) has a plurality of protrusions (301); the bottom end surfaces of the protrusions (301) are in smooth contact with the bottom of the shallow groove (2); the drive assembly comprises a hanging component that can move linearly along the length direction of the shallow groove (2); the hanging component and the test block (3) are hung together by a plug pin (14) that can be pulled out and inserted vertically; the hanging component moves from one side of the test bench (1) to the other side along the length direction of the shallow groove (2).

2. A lubricant friction test device according to claim 1, characterized in that: The driving assembly also includes an L-shaped driving arm (4), wherein a horizontal arm (401) of the driving arm (4) is located above the test bench (1), and a vertical arm (402) thereof is slidably mounted against the back of the test bench (1) and is fixedly connected to a threaded block (6) via a sliding column (5), wherein the threaded block (6) is threadably sleeved on a lead screw (7), and the lead screw (7) is rotatably mounted in the test bench (1).

3. A lubricant friction test device according to claim 2, characterized in that: The vertical arm (402) is provided with a plurality of adjusting screws (8) perpendicular thereto. The sliding column (5) is linearly slidably installed in a sliding groove on the back of the test bench (1). The adjusting screw (8) is threadedly connected to the vertical arm (402) and penetrates through it, and then extends into a sliding block (9) in the sliding column (5). The sliding block (9) vertically slides in the sliding column (5) without being separated from the sliding column (5). One end of the adjusting screw (8) rotatably located in the sliding block (9) is a T-shaped structure (10), so that when the adjusting screw (8) is turned, the T-shaped structure (10) can axially press against the sliding block (9) to achieve the fixed connection between the vertical arm (402) and the sliding column (5).

4. The friction force testing device of a lubricant according to claim 2, characterized in that: The shallow groove (2) is a rectangular cross-sectional structure. The hanging component on the shallow groove (2) includes a hanging column (11) connected to the horizontal arm (401) and a pulling column (13) fixed to the side of the test block (3). The pulling column (13) and the hanging column (11) are each provided with a plug hole. When the two plug holes are connected up and down, the plug pin (14) is vertically inserted into them, so that the hanging column (11) moves linearly with the pulling column (13).

5. The friction force testing device of a lubricant according to claim 4, characterized in that: A section of the pull column (13) and the hanging column (11) that is opposite to each other has a plane on both the upper and lower sides, and the insertion hole is provided at the position where the plane is located.

6. The friction force testing device of a lubricant according to claim 2, characterized in that: The horizontal arm (401) includes a front arm (40101) and a rear arm (40102) which are arranged opposite to each other. The front arm (40101) is arranged close to the shallow groove (2). The two arms are assembled together by plugging and fitting through a positioning sleeve (22). One end of the hanging column (11) is fixedly inserted into the front arm (40101) and is connected to a mechanical sensor of the detection component through a tension spring (20). The mechanical sensor is arranged in the rear arm (40102) and moves together with the rear arm (40102). The rear arm (40102) is fixedly connected to the vertical arm (402), while the front arm (40101) is not connected to the vertical arm (402).

7. A lubricant friction test device according to claim 6, characterized in that: The mechanical sensor comprises a core column (15) coaxially facing the hanging column (11), the two are connected via the tension spring (20), and the rear arm (40102) is axially slidably connected to the core column (15); The mechanical sensor also includes an insulating rod (18) arranged parallel to the core column (15), a resistance wire (16) is spirally wound on the insulating rod (18), one end of the resistance wire (16) is connected to a test circuit, and two adjacent turns of the resistance wire (16) do not contact each other; an insulating ring sleeve (17) is also installed on the core column (15), a conductive element (19) is fixed on the insulating ring sleeve (17), and the conductive element (19) can always contact with a certain surface of the resistance wire (16) in a sliding manner, and the conductive element (19) is connected to the test circuit. When the rear arm (40102) moves away from the forearm (40101), the tension spring (20) is stretched, and the resistance wire (16) slides horizontally relative to the conductive element (19) to change the contact position of the conductive element (19) and the resistance wire (16), and then the resistance of the corresponding length of the resistance wire (16) is connected to the test circuit.

8. The friction force testing device of a lubricant according to claim 7, characterized in that: The conductive element (19) is an elastic telescopic structure, capable of being extended and retracted along the radial direction of the insulating rod (18), and always maintaining an elastic extrusion state therewith.

9. The friction force testing device of a lubricant according to claim 7, characterized in that: A movable disk (23) is coaxially fixed on the hanging column (11), and the movable disk (23) is axially movably installed in the forearm (40101). A driving disk (26) is rotatably installed in the front side of the forearm (40101). The driving disk (26) is rotatably installed around the hanging column (11). The inner surface of the driving disk (26) is an internal gear structure, and the internal gear is meshed with a plurality of rod-shaped gears (25) on the inner side of the annular array. A stud (24) is coaxially fixed at one end of the rod-shaped gear (25). The stud (24) is threadedly inserted into the forearm (40101) and is rotatably connected to the movable disk (23), so that when the driving disk (26) is rotated, all the studs (24) are synchronously axially moved to drive the movable disk (23) to axially translate; It also includes a right-angle rod (21), one end of which is fixed to the inner wall of the mounting hole where the hanging column (11) is located, and the other end of which is coaxially fixed to the end surface of the core column (15), so that the forearm (40101) and the core column (15) are connected as a whole.

10. A lubricant friction force testing device according to claim 9, characterized in that: The outer wall of the driving disk (26) is provided with a thread to be threadedly matched with the threaded mounting hole on the forearm (40101); a compressed conical spring (27) is provided between the end face of the driving disk (26) and the bottom of the threaded hole, and all the rod-shaped gears (25) are located on the inner side of the conical spring (27); a hexagonal groove (12) is coaxially provided on the outer bottom end face of the driving disk (26) for a hexagonal wrench to be inserted to rotate the driving disk (26), and the end face of the hexagonal wrench has an accommodating cavity (28) that can accommodate the rod-shaped gear (25).

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