Friction force testing device

Abstract

The utility model discloses a friction force testing device in the field of mechanical testing, which is used for testing friction force between a linear guide rail and a sliding block and comprises a base, the linear guide rail is in sliding fit with the sliding block, and the linear guide rail is fixed on the base; the driving part is fixedly installed on the base, a force sensor is connected between the moving end of the driving part and the sliding block, and the moving end moves in the track direction of the linear guide rail; the control center is electrically connected with the force sensor and is used for processing the force data of the force sensor; according to the device, the sliding block is driven by the driving part to linearly move, and the friction force between the linear guide rail and the sliding block is accurately measured in combination with the high-precision force sensor. The problem of inaccurate measurement caused by angular deviation or uneven force during manual measurement is avoided, and the accuracy and consistency of measurement results are ensured; and the control center is arranged, so that the accuracy and efficiency of data analysis are improved.

Description

Technical Field

[0001] The present application relates to the technical field of mechanical testing, and in particular to a friction testing device. Background Art

[0002] Linear guides are widely used in semiconductor automation production equipment, precision instruments and other fields. Their main function is to achieve high-precision and high-speed linear motion. The friction of linear guides directly affects the running speed, stability and product accuracy of the equipment. However, the existing linear guide friction test technology usually has the following problems:

[0003] Most existing testing methods are manual measurements, which make it difficult to reproduce the working state of linear guides. In addition, due to different proficiency levels and operating techniques of operators, the movement of the slider is unstable, resulting in poor accuracy and consistency of the measurement results, making it difficult to use for design analysis. Traditional testing equipment has a complex structure and requires multiple debugging and calibration. The operation is cumbersome, time-consuming and labor-intensive. Summary of the invention

[0004] The purpose of the present application is to provide a friction force testing device to solve the defects of low measurement accuracy and complex operation of the testing device in the prior art.

[0005] In order to solve the above technical problems, this application is implemented by adopting the following technical solutions:

[0006] A friction test device is used to test the friction of a linear guide rail and a slider, comprising:

[0007] A base, the linear guide rail and the slider are slidably matched, and the linear guide rail is fixed on the base;

[0008] A driving part, the driving part is fixedly mounted on the base, a force sensor is connected between the moving end of the driving part and the slider, and the moving end moves along the track direction of the linear guide rail;

[0009] A control center is electrically connected to the force sensor and is used for force data processing of the force sensor.

[0010] According to a further solution of the present application, a boss is provided on the base, the linear guide rail is fixed to a side surface of the boss, and the driving unit is installed on a bottom surface of the boss.

[0011] According to a further solution of the present application, the driving part includes a servo motor and a screw, the servo motor is fixed on the base, a vertical bearing seat is fixed on the base, the screw thread is connected to the vertical bearing seat and is parallel to the track of the linear guide, a screw nut seat is threadedly installed on the screw, and the force sensor is fixed between the screw nut seat and the slider.

[0012] In a further solution, a buffer portion is installed between the force sensor and the slider for flexibly connecting the screw nut seat and the slider.

[0013] According to a further solution, the buffer portion includes a first connecting member, a second connecting member and a self-aligning ball bearing connecting assembly, wherein the first connecting member is fixedly connected to the force sensor, the second connecting member is fixed to a side of the slider facing the force sensor, and two ends of the self-aligning ball bearing connecting assembly are correspondingly rotatably connected to the first connecting member and the second connecting member.

[0014] In a further solution, the self-aligning ball bearing connection assembly includes a connecting rod, and self-aligning ball bearings are rotatably mounted on both ends of the connecting rod, and the two self-aligning ball bearings are correspondingly rotatably connected to the first connecting member and the second connecting member.

[0015] According to a further solution of the present application, the control center includes a data receiver and a computer, and the data receiver, the computer and the force sensor are connected via a data transmission line.

[0016] According to a further solution of the present application, a limit block is provided at the end of the linear guide rail.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] This device uses a driving unit to drive the slider to move linearly, and combines with a high-precision force sensor to achieve accurate measurement of the friction between the linear guide and the slider. It avoids the problem of inaccurate measurement due to angle deviation or uneven force during manual measurement, and ensures the accuracy and consistency of the measurement results; the setting of the control center can receive and process the output signal of the force sensor in real time. Data acquisition and processing are more convenient and efficient, reducing the tedious process of manual data processing and improving the accuracy and efficiency of data analysis.

[0019] In addition, this device can measure the friction between the linear guide and the slider under different speeds and displacement conditions, and is suitable for a variety of test environments. Through accurate measurement of friction and analysis of its changing rules, it provides reliable data support for the research, development, design and application of linear guides.

[0020] A self-aligning ball bearing connection assembly is provided between the force sensor and the slider, which can adaptively offset the torque applied to the slider at the moment when the screw nut seat is started, further enhancing the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of an embodiment of the present application;

[0022] Figure 2This is a structural schematic diagram of a self-aligning ball bearing connection assembly in an embodiment of the present application;

[0023] Among them, 1. base; 2. linear guide; 3. slider; 4. servo motor; 5. coupling; 6. vertical bearing seat; 7. self-aligning ball bearing connection assembly; 70. self-aligning ball bearing; 71. connecting rod; 8. force sensor; 9. screw nut seat; 10. screw; 11. data transmission line; 12. data receiver; 13. computer; 14. first connecting piece; 15. second connecting piece. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Example

[0025] Reference Figure 1 The present embodiment discloses a linear guide friction force testing device, which includes a driving part and a base 1, a slider 3 is slidably matched on the linear guide 2, a boss is provided on the base 1, the linear guide 2 is fixed to the side of the boss of the base 1 by bolts, the driving part is fixedly installed on the bottom surface of the boss of the base 1, a force sensor 8 is connected between the moving end of the driving part and the slider 3, the moving end moves along the track direction of the linear guide 2, and also includes a control center, which is electrically connected to the force sensor 8 for force data processing of the force sensor 8.

[0026] Continue to observe the attached Figure 1 The driving part includes a servo motor 4 fixedly mounted on one side of the base 1, wherein a vertical bearing seat 6 is fixed on the bottom surface of the boss, a screw rod 10 is threadedly mounted on the vertical bearing seat 6, and the screw rod 10 is arranged along the track length direction of the linear guide 2, one end of the screw rod 10 passes through the vertical bearing seat 6 and is connected to the output shaft of the servo motor 4 through the coupling 5, and a screw rod nut seat 9 is threadedly mounted on the other end of the screw rod 10, and a force sensor 8 is fixed between the slider 3 and the screw rod nut seat 9.

[0027] The control center in this embodiment includes a data receiver 12 and a computer 13 , and the data receiver 12 , the computer 13 and the force sensor 8 are connected via a data transmission line 11 .

[0028] When in use, the servo motor 4 is started to drive the screw nut seat 9 to move back and forth, that is, the slider 3 is driven to move back and forth on the linear guide rail 2. At this time, the data on the force sensor 8 is received by the data receiver 12 and calculated and processed by the computer 13. Example

[0029] Reference Figure 1 and 2 , this embodiment discloses a linear guide friction test device, which is optimized on the basis of the first embodiment, and a buffer portion is installed between the force sensor 8 and the slider 3, which is used for the flexible connection between the screw nut seat 9 and the slider 3; the buffer portion includes a first connecting piece 14, a second connecting piece 15 and a self-aligning ball bearing connecting assembly 7, the first connecting piece 14 is fixedly connected to the force sensor 8, and the second connecting piece 15 is fixed to the side of the slider 3 facing the force sensor 8, and the two ends of the self-aligning ball bearing connecting assembly 7 are correspondingly rotatably connected to the first connecting piece 14 and the second connecting piece 15. When the screw 10 just rotates, there is a tendency of relative torsion between the force sensor 8 and the slider 3. The assembly converts the rigid connection into a flexible connection, allowing the stress between the two rigid connecting pieces to be released, greatly reducing the force generated by the remaining links during the movement of the screw 10, avoiding interference with the friction measurement of the linear guide 2, and preventing the torque of the servo motor 4 from affecting the final friction test result when it is just started, and improving the test accuracy of the device as much as possible.

[0030] Reference Figure 2 In the second embodiment, the self-aligning ball bearing connecting assembly 7 includes a connecting rod 71, and self-aligning ball bearings 70 are rotatably installed at both ends of the connecting rod 71. The two self-aligning ball bearings 70 are correspondingly rotatably connected to the first connecting member 14 and the second connecting member 15; the first connecting member 14 here uses a U-shaped member, and the second connecting member 15 uses an L-shaped member. The force sensor 8 is respectively connected to the screw nut seat 9 and the U-shaped fixing, and the preload force is applied by two bolts.

[0031] Specific use: The test device realizes the configuration of speed, acceleration and positioning functions through external circuit I / O control. By adjusting the tightness of the fixing bolts on both sides of the force sensor 8, the force sensor 8 is clamped with a suitable preload force. When the force sensor 8 is preloaded, the servo motor 4 drives the screw 10 to rotate, thereby driving the slider 3 to move along the linear guide 2. During this movement, the friction force generated between the slider 3 and the linear guide 2 causes the reading of the force sensor 8 to change. The change in the reading is the dynamic friction force generated during the relative movement of the slider 3 and the linear guide 2, thereby realizing the measurement of the friction force. The measured friction force is transmitted from the force sensor 8 to the data receiver 12 through the data transmission line 11, and finally the data is processed on the computer 13.

[0032] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0033] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

Claims

1. A friction force testing device for testing the friction force of a linear guide rail (2) and a slider (3), characterized in that: include A base (1), the linear guide rail (2) and the slider (3) are slidably matched, and the linear guide rail (2) is fixed on the base (1); A driving unit, the driving unit is fixedly mounted on the base (1), a force sensor (8) and a buffer unit connected to the moving end of the driving unit and the slider (3) are provided, the moving end moves along the track direction of the linear guide rail (2), and the force sensor (8) is fixedly connected to the moving end; The buffer portion comprises a first connecting member (14), a second connecting member (15) and a self-aligning ball bearing connecting assembly (7); the first connecting member (14) is fixedly connected to the force sensor (8); the second connecting member (15) is fixed to a side of the slider (3) facing the force sensor (8); and two ends of the self-aligning ball bearing connecting assembly (7) are correspondingly rotatably connected to the first connecting member (14) and the second connecting member (15).

2. The friction force testing device according to claim 1, characterized in that: The base (1) is provided with a boss, the linear guide rail (2) is fixed on the side surface of the boss, and the driving unit is installed on the bottom surface of the boss.

3. The friction force testing device according to claim 1, characterized in that: The driving unit comprises a servo motor (4) and a screw (10), wherein the servo motor (4) is fixed on the base (1), a vertical bearing seat (6) is fixed on the base (1), the screw (10) is threadedly connected to the vertical bearing seat (6) and is parallel to the track of the linear guide rail (2), a screw nut seat (9) is threadedly mounted on the screw (10), and two ends of the force sensor (8) are fixedly connected to the screw nut seat (9) and the first connecting member (14).

4. The friction force testing device according to claim 1, characterized in that: The self-aligning ball bearing connection assembly (7) comprises a connection rod (71), with self-aligning ball bearings (70) rotatably mounted on both ends of the connection rod (71), and the two self-aligning ball bearings (70) correspondingly rotatably connect the first connection piece (14) and the second connection piece (15).

5. The friction force testing device according to claim 1, characterized in that: It also includes a control center, the control center is electrically connected to the force sensor (8) and is used for force data processing of the force sensor (8); The control center comprises a data receiver (12) and a computer (13), and the data receiver (12), the computer (13) and the force sensor (8) are connected via a data transmission line (11).

6. The friction force testing device according to claim 1, characterized in that: A limit block is provided at the end of the linear guide rail (2).

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