Tiny wear contact force loading device and method

Abstract

The invention relates to a tiny abrasion contact force loading device and method.The tiny abrasion contact force loading device comprises a fixed base, contact force loading modules symmetrically distributed on the two sides of the fixed base and an abrasion displacement loading rod located between the two contact force loading modules, each contact force loading module comprises a contact force loading fixed end, a rotating unit, a balancing weight, a first wear sample and a second wear sample, the rotating unit is rotatably mounted on the fixed base through the contact force loading fixed end, and the balancing weight and the first wear sample are arranged on the rotating unit; the second abrasion sample is arranged on the abrasion displacement loading rod and is in contact with the first abrasion sample, and the weight of the balancing weight meets the contact force calibration requirement; the tiny wear test of the first wear sample and the second wear sample is realized through the reciprocating motion of the wear displacement loading rod. Compared with the prior art, the device has the advantages of convenience in adjustment of contact force, high loading stability and the like.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical testing devices, and in particular to a device and method for loading a tiny wear contact force. Background Art

[0002] Wear testing is a test and evaluation method for friction damage of structural materials under long-term use in current engineering applications. It mainly evaluates the wear resistance of materials by simulating the damage to structural materials caused by long-term reciprocating friction under certain contact forces and operating environments.

[0003] The existing wear test contact force is generally simulated by constant force springs or corresponding mechanical loading devices. However, this contact force simulation loading method has the following disadvantages: usually, the contact force loading of constant force springs and mechanical loading devices is suitable for larger friction contact forces, and contact forces below 1N are usually not well simulated; during the simulated contact force loading process of the wear test, the constant force springs and mechanical loading devices will produce certain vibration displacements due to the reciprocating friction process of the wear test, which will cause certain fluctuations in the simulated contact force of the constant force springs and mechanical loading devices, thus affecting the stability of the contact force loading.

[0004] Therefore, it is necessary to develop a new loading device with high stability that is suitable for small wear contact forces. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a small wear contact force loading device and method which is easy to adjust the contact force and has high loading stability.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A micro-wear contact force loading device comprises a fixed base, contact force loading modules symmetrically distributed on both sides of the fixed base, and a wear displacement loading rod located between the two contact force loading modules, wherein:

[0008] Each of the contact force loading modules comprises a contact force loading fixed end, a rotating unit, a counterweight, a first wear sample and a second wear sample. The rotating unit is rotatably mounted on a fixed base through the contact force loading fixed end. The counterweight and the first wear sample are arranged on the rotating unit. The second wear sample is arranged on a wear displacement loading rod and contacts the first wear sample. The weight of the counterweight meets the contact force calibration requirements.

[0009] The micro-wear test of the first wear specimen and the second wear specimen is realized by the reciprocating motion of the wear displacement loading rod.

[0010] Furthermore, the rotating unit is connected to the contact force loading fixed end via a rotating bearing.

[0011] Further, the rotating unit comprises a first contact force loading rotating end and a second contact force loading rotating end which are fixedly connected, and a connection between the first contact force loading rotating end and the second contact force loading rotating end forms a space for placing the first wear sample.

[0012] Furthermore, the counterweight block is fixed on the first contact force loading rotating end.

[0013] Furthermore, the first contact force loading rotating end and the second contact force loading rotating end are connected by bolts.

[0014] Furthermore, the counterweight is connected to the rotating unit by bolts.

[0015] Furthermore, the first wear specimen is a cylindrical structure specimen, and the second wear specimen is a planar structure specimen.

[0016] Furthermore, the minimum loading contact force of the contact force loading device is 0.1N.

[0017] The present invention also provides an experimental method using the micro-wear contact force loading device as described above, comprising the following steps:

[0018] Fix the fixed base relative to the absolute reference system;

[0019] Install the micro-wear contact force loading device to the test state, calibrate the contact force, and select a suitable counterweight;

[0020] The wear displacement loading rod performs reciprocating motion, so that relative reciprocating friction is generated between the first wear sample and the second wear sample, thereby completing the micro-wear test.

[0021] Furthermore, the contact force calibration includes:

[0022] The contact force loading device is connected to the micro-dynamometer by using a traction rope, and it is ensured that the micro-dynamometer, the traction point and the contact point of the wear specimen are in the same horizontal plane;

[0023] Move the micro dynamometer gradually to straighten the traction rope in the direction of the contact force and ensure that the two wear specimens do not separate;

[0024] Remove the second wear specimen, calibrate the contact force by reading the micro-dynamometer reading, and replace the counterweight until the micro-dynamometer reading reaches the target contact force, indicating that the calibration is successful.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention is provided with a contact force loading module including a contact force loading fixed end, a rotating unit, a counterweight block, etc., which improves the traditional constant force spring or mechanical loading device into a device that applies contact force by the self-weight component of the mechanism, and can adjust the size of the contact force by changing the counterweight of the mechanism, and can achieve a minimum contact force loading of 0.1N.

[0027] 2. The present invention designs a split symmetrical contact force loading mode, which ensures that the friction process of the structural material does not affect the stability of the contact force loading on the basis of ensuring the balance of the contact force loading. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Figure 2 It is a schematic diagram of the force analysis of the contact force applied in the present invention;

[0030] Figure 3 It is a schematic diagram of contact force measurement calibration of the present invention;

[0031] In the figure, 1. fixed base; 2. contact force loading fixed end; 3. first contact force loading rotating end; 4. second contact force loading rotating end; 5. rotating bearing; 6. counterweight; 7. first wear specimen; 8. second wear specimen; 9. wear displacement loading rod; 10. wear displacement loading direction; 11. fixing bolt; 12. traction force; 13. gravity; 14. contact reaction force; 15. micro dynamometer; 16. traction rope. DETAILED DESCRIPTION

[0032] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0033] refer to Figure 1As shown, this embodiment provides a micro-wear contact force loading device, including a fixed base 1, contact force loading modules symmetrically distributed on both sides of the fixed base 1, and a wear displacement loading rod 9 located between the two contact force loading modules. Among them, each contact force loading module includes a contact force loading fixed end 2, a rotating unit, a counterweight 6, a first wear sample 7, and a second wear sample 8. The rotating unit is rotatably mounted on the fixed base 1 through the contact force loading fixed end 2, the counterweight 6 and the first wear sample 7 are arranged on the rotating unit, and the second wear sample 8 is arranged on the wear displacement loading rod 9 and contacts the first wear sample 7. The weight of the counterweight 6 meets the contact force calibration requirements. Due to the self-weight, the rotating unit drives the first wear sample 7 to contact the second wear sample 8 closely, thereby generating a contact force. The micro-wear test of the first wear sample 7 and the second wear sample 8 is realized through the reciprocating motion of the wear displacement loading rod 9.

[0034] In the above-mentioned micro-wear contact force loading device, the contact force loading modules are symmetrically distributed on both sides of the fixed base 1. Through the split symmetrical design, on the basis of ensuring the balance of contact force loading, it is ensured that the friction process of the structural material does not affect the stability of the contact force loading.

[0035] Specifically, the rotating unit is connected to the contact force loading fixed end 2 via the rotating bearing 5, so as to ensure that the rotating unit can freely rotate relative to the contact force loading fixed end 2 around the bearing axis.

[0036] The rotating unit includes a first contact force loading rotating end 3 and a second contact force loading rotating end 4 which are fixedly connected. The connection between the first contact force loading rotating end 3 and the second contact force loading rotating end 4 forms a space for placing the first wear specimen 7, so as to facilitate the fastening of the first wear specimen 7. The counterweight 6 is fixed to the first contact force loading rotating end 3 by bolts. The first contact force loading rotating end 3 and the second contact force loading rotating end 4 are connected by bolts.

[0037] In this embodiment, the first wear specimen 7 is a cylindrical structure specimen, and the second wear specimen 8 is a planar structure specimen, so that the contact force between the wear specimens is always perpendicular to the surface of the second wear specimen to ensure that the direction of the contact force remains unchanged.

[0038] In this embodiment, the contact force loading device can adjust the contact force by changing the weight of the mechanism, and can achieve a minimum contact force loading of 0.1N, which can well realize simulated loading for contact forces below 1N.

[0039] In this embodiment, the experimental method that can be implemented based on the above-mentioned micro-wear contact force loading device includes the following steps:

[0040] 1) First, a fixed base 1 is used as a fixed end of a fixed contact force loading device, which is fixed relative to an absolute reference system;

[0041] 2) The contact force loading fixed end 2 is connected and fixed to the fixed base 1 by bolts;

[0042] 3) The first contact force loading rotating end 3 is connected to the contact force loading fixed end 2 through a rotating bearing 5, ensuring that the rotating end 3 can freely rotate around the bearing axis relative to the fixed end 2;

[0043] 4) The second contact force loading rotating end 4 is connected to the first contact force loading rotating end 3 by bolts, and is used to fasten the first wear test 7;

[0044] 5) Due to the contact force loading rotating end caused by the deadweight, the first wear specimen 7 is brought into close contact with the second wear specimen 8, thereby generating a contact force. Since the first wear specimen is a cylindrical structure and the second wear specimen is a planar structure, the contact force between the wear specimens is always perpendicular to the surface of the second wear specimen, so as to ensure that the contact force remains unchanged.

[0045] 6) The contact force loading device adjusts the mass of its own counterweight block 6 through the contact force calibration process to change the size of the contact force, thereby achieving controllable contact force;

[0046] 7) The second wear specimen 8 is fixed on the wear displacement loading rod 9, and both sides are arranged symmetrically to ensure the stability of the contact force;

[0047] 8) The loading direction 10 of the wear displacement loading rod 9 is up and down reciprocating loading, so that relative reciprocating friction is generated between the second wear sample and the first wear sample. During this reciprocating friction process, the contact force between the first wear sample and the second wear sample is always stable, and the direction is always kept perpendicular to the friction direction, thereby completing the micro wear test.

[0048] In a specific implementation, the first wear specimen and the second wear specimen may be fixed by clamping or bolting.

[0049] In a specific implementation, the reciprocating motion of the wear displacement loading rod is generally achieved by an electromagnetic excitation system or a hydraulic actuation system, and may also be achieved by a cam motor system.

[0050] During the contact force loading process, the contact force application and force analysis are as follows: Figure 2 As shown, the forces acting on the first wear specimen 7 include traction force 12, gravity 13 and contact reaction force 14, wherein the direction of the traction force is usually the direction of the line connecting the center of the rotating bearing and the center of gravity of the rotating part loaded with the contact force.

[0051] Contact force calibration is achieved using a micro dynamometer, which includes the following steps:

[0052] 1) First, install the contact force loading device and the wear specimen to the test state;

[0053] 2) Use the traction rope 16 to connect the contact force loading device with the micro dynamometer 15, and ensure that the micro dynamometer, the traction point and the contact point of the wear sample are in the same horizontal plane. In this embodiment, the traction rope 16 is a flexible traction rope;

[0054] 3) Gradually move the micro dynamometer to straighten the traction rope in the direction of the contact force and ensure that the wear specimens do not separate;

[0055] 4) Remove the second wear sample. At this time, the traction force of the traction rope is equivalent to the contact force between the wear samples. The contact force is calibrated by reading the reading of the small dynamometer, and the calibration is successful by replacing the counterweight until the dynamometer reading reaches the target contact force.

[0056] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A micro-wear contact force loading device, characterized in that: It comprises a fixed base (1), contact force loading modules symmetrically distributed on both sides of the fixed base (1), and a wear displacement loading rod (9) located between the two contact force loading modules, wherein: Each of the contact force loading modules comprises a contact force loading fixed end (2), a rotating unit, a counterweight (6), a first wear sample (7) and a second wear sample (8); the rotating unit is rotatably mounted on a fixed base (1) via the contact force loading fixed end (2); the counterweight (6) and the first wear sample (7) are arranged on the rotating unit; the second wear sample (8) is arranged on a wear displacement loading rod (9) and is in contact with the first wear sample (7); the weight of the counterweight (6) meets the contact force calibration requirements; The micro-wear test of the first wear sample (7) and the second wear sample (8) is realized by the reciprocating motion of the wear displacement loading rod (9).

2. The micro-wear contact force loading device according to claim 1 is characterized in that: The rotating unit is connected to the contact force loading fixed end (2) via a rotating bearing (5).

3. The micro-wear contact force loading device according to claim 1 is characterized in that: The rotating unit comprises a first contact force loading rotating end (3) and a second contact force loading rotating end (4) which are fixedly connected, and a space for placing the first wear specimen (7) is formed at the connection between the first contact force loading rotating end (3) and the second contact force loading rotating end (4).

4. The micro-wear contact force loading device according to claim 3 is characterized in that: The counterweight block (6) is fixed on the first contact force loading rotating end (3).

5. The micro-wear contact force loading device according to claim 3 is characterized in that: The first contact force loading rotating end (3) and the second contact force loading rotating end (4) are connected by bolts.

6. The micro-wear contact force loading device according to claim 1, characterized in that: The counterweight block (6) is connected to the rotating unit via bolts.

7. The micro-wear contact force loading device according to claim 1 is characterized in that: The first wear specimen (7) is a cylindrical structure specimen, and the second wear specimen (8) is a plane structure specimen.

8. The micro-wear contact force loading device according to claim 1, characterized in that: The minimum loading contact force of the contact force loading device is 0.1N.

9. An experimental method using the micro-wear contact force loading device as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: Fixing the fixed base (1) relative to the absolute reference system; Install the micro-wear contact force loading device to the test state, perform contact force calibration, and select a suitable counterweight (6); The wear displacement loading rod (9) performs reciprocating motion, so that relative reciprocating friction is generated between the first wear sample (7) and the second wear sample (8), thereby completing a micro-wear test.

10. The experimental method according to claim 9, characterized in that: The contact force calibration includes: The contact force loading device is connected to the micro-dynamometer by using a traction rope, and it is ensured that the micro-dynamometer, the traction point and the contact point of the wear specimen are in the same horizontal plane; Move the micro dynamometer gradually to straighten the traction rope in the direction of the contact force and ensure that the two wear specimens do not separate; Remove the second wear specimen, calibrate the contact force by reading the micro-dynamometer reading, and replace the counterweight until the micro-dynamometer reading reaches the target contact force, indicating that the calibration is successful.

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