Reciprocating friction testing machine

Abstract

The utility model discloses a reciprocating friction testing machine. The device comprises a base, a workbench and a test force loading mechanism, wherein the workbench is driven by a first ball screw pair to reciprocate; the test force loading mechanism at least comprises a first test force loading mechanism and a second test force loading mechanism, the first test force loading mechanism comprises a first support provided with a second guide rail, a loading seat, a lifting mechanism and a spring loading mechanism, and one end of the loading seat is connected with a sliding block slidably arranged on the second guide rail; the spring loading mechanism is connected to the other end of the loading seat, the loading seat is connected with the lifting mechanism, and the lower part of the spring loading mechanism is connected with a three-dimensional sensor; and the second test force loading mechanism is a micro test force friction force measuring mechanism. According to the utility model, a multi-station design is adopted, so that the tribological test can be simultaneously carried out on samples with different geometric sizes, different loading forces and different contact forms, the tribological test can also be carried out on the same sample under a plurality of load conditions, and the use flexibility is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to a reciprocating friction testing machine and belongs to the technical field of testing machines. BACKGROUND

[0002] The reciprocating friction testing machine is a testing device for studying the friction performance of materials or surface coatings. Under a certain testing force, the reciprocating friction testing machine simulates linear reciprocating motion, and performs tribological testing by controlling and changing parameters such as testing force and reciprocating speed to evaluate the friction performance of materials or surface coatings.

[0003] The existing reciprocating friction testing machine is usually configured with only one testing force loading mechanism, and can only perform tribological testing on one sample at a time. It cannot simultaneously perform tribological testing on samples of different geometric sizes, different loading forces, and different contact forms. Moreover, the testing force range of the testing force loading mechanism is generally limited, and the same testing force loading mechanism cannot simultaneously realize large load loading and small load loading. Therefore, it is also impossible to perform tribological testing on the same sample under multiple load conditions on the same testing machine. SUMMARY

[0004] In view of the above defects in the prior art, the utility model provides a reciprocating friction testing machine capable of simultaneously performing tribological testing on samples of different geometric sizes, different loading forces, and different contact forms and performing tribological testing on the same sample under multiple load conditions.

[0005] The utility model is realized through the following technical scheme: a reciprocating friction testing machine comprises a base, a workbench, and a testing force loading mechanism, characterized in that: a first guide rail and a first ball screw pair are arranged on the upper portion of the base, the workbench is slidingly arranged on the upper portion of the first guide rail, the nut of the first ball screw pair is connected to the bottom of the workbench, and the first ball screw pair is driven by a stepping motor; the testing force loading mechanism comprises at least a first testing force loading mechanism and a second testing force loading mechanism, the first testing force loading mechanism comprises a first support provided with a vertical second guide rail, a loading seat, a lifting mechanism, and a spring loading mechanism, the first support is fixed to the base, one end of the loading seat is connected to a sliding block slidingly arranged on the second guide rail, the spring loading mechanism is connected to the other end of the loading seat, the loading seat is connected to the lifting mechanism, and the lower portion of the spring loading mechanism is connected to a three-dimensional sensor; and the second testing force loading mechanism is a small testing force friction force measuring mechanism.

[0006] The utility model discloses, when testing, the lower sample is fixed on the workbench, and the upper sample is fixed below the three-dimensional sensor through the upper sample chuck holder seat. The lead screw of first ball screw pair is driven to rotate by the stepping motor, and then the workbench is driven to reciprocate along the first guide rail on the base through the nut of ball screw pair. The first test force loading mechanism and the second test force loading mechanism are used for loading corresponding test force to the sample, wherein the first test force loading mechanism can load larger test load to the sample, and tribological test under large load condition can be carried out, the second test force loading mechanism adopts the tiny test force friction force measuring mechanism, and can load tiny test force to the sample, and tribological test under tiny test force can be carried out. When the first test force loading mechanism loads test force, the loading seat is driven to move up and down through the lifting mechanism, and then the spring loading mechanism is driven to move up and down, force is applied to the upper sample chuck holder seat through the spring loading mechanism, test force between the upper and lower sample friction surfaces is formed, the up and down movement of the loading seat driven by the lifting mechanism can realize the application of test force and the control of test force size change, and the three-dimensional sensor can detect the force value change of three directions simultaneously, and the force value signals of test force and friction force are collected in real time. The second test force loading mechanism adopts the tiny test force friction force measuring mechanism, which can adopt any test force loading mechanism for loading and measuring tiny test force friction in the prior art. The workbench in the utility model can clamp different geometric sizes and different contact forms of samples simultaneously to carry out tribological test, and can also carry out tribological test under multiple load conditions on the same sample.

[0007] Further, the spring loading mechanism includes an upper support plate located on the upper part of the loading seat, a lower support plate located on the lower part of the loading seat, a compression spring arranged between the upper support plate and the loading seat, and a compression spring arranged between the lower support plate and the loading seat. One guide rod is connected between the two ends of the upper support plate and the lower support plate, respectively, the guide rod moves up and down through the loading seat, and a linear bearing is arranged on the outside of the guide rod.

[0008] Further, the lifting mechanism includes a loading stepping motor fixedly arranged on the upper part of the first bracket and a second ball screw pair vertically arranged on the first bracket, the nut of the second ball screw pair is connected with the loading seat, and the second ball screw pair is connected with the loading stepping motor through a belt transmission mechanism.

[0009] Further, the second test force loading mechanism comprises a second support, a strain component and a force applying rod, the second support is fixed on the base through a cushion block, the strain component has a mountain-shaped structure, deformation gaps are arranged on two supporting arms of the strain component along the length direction of the supporting arms, the deformation gaps divide the supporting arms into deformation supporting parts located at the outer sides and elastic parts located at the inner sides, the elastic parts are in the form of elastic sheet structures, the deformation supporting parts and the elastic parts are connected at one end away from the transverse arm of the strain component, the middle arm of the strain component is connected with the other ends of the elastic parts on the two supporting arms through the transverse arm, the strain component is rotationally connected with the second support through the deformation supporting parts of the two supporting arms, the force applying rod is arranged at the end of the free end of the middle arm of the strain component, and counterweights and displacement sensors are arranged at the two deformation supporting parts of the strain component respectively.

[0010] Further, the elastic parts are independent components from the deformation supporting parts and the transverse arm of the strain component, and the two ends of the elastic parts are connected with the deformation supporting parts and the transverse arm of the strain component through screws respectively.

[0011] Further, the first test force loading mechanism and the second test force loading mechanism are oppositely arranged on the two sides of the workbench.

[0012] Further, a plurality of second test force loading mechanism mounting positions are arranged on the base along the movement direction of the workbench.

[0013] Further, the workbench is slidably arranged on the upper part of the first guide rail through the moving plate arranged on the lower part of the workbench, and the workbench and the moving plate are detachably connected.

[0014] The utility model discloses the beneficial effects are: the utility model discloses multi-station design, can realize the different geometry size, different loading force, different contact form's sample simultaneously carry out tribology test, also can realize the tribology test of same sample under multiple load conditions, and its use flexibility is high, can realize multiple tribology test test on the same test machine. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural schematic view of the utility model;

[0016] Figure 2 is a top view schematic view (loading seat and spring loading mechanism of the first test force loading mechanism, counterweight of the second test force loading mechanism are not shown) of the utility model;

[0017] Figure 3 is a side view schematic view (three-dimensional sensor and the following parts, second guide rail, second test force loading mechanism are not shown) of the utility model;

[0018] Figure 4 is a schematic view of the spring loading mechanism in the utility model;

[0019] Figure 5 is a front view schematic view of the second test force loading mechanism in the utility model;

[0020] Figure 6 is Figure 5 a top view schematic view (counterweight is not shown) of the utility model;

[0021] Figure 7 is a front view schematic view of the strain component in the second test force loading mechanism in the utility model;

[0022] Figure 8 is Figure 7 a top view schematic view of the utility model;

[0023] Figure 9 is Figure 7 a side view schematic view of the utility model;

[0024] In the drawing, 1, base, 2, first test force loading mechanism, 3, second test force loading mechanism, 4, workbench, 5, moving plate, 6, first guide rail, 7, cushion block, 8, screw rod support, 9, screw rod support, 10, first ball screw pair, 11, reciprocating stepper motor, 12, displacement sensor;

[0025] 2.1, first support, 2.2, second guide rail, 2.3, second ball screw pair, 2.4, sliding block, 2.5, loading stepper motor, 2.6, driving pulley, 2.7, protective cover, 2.8, driven pulley, 2.9, loading seat, 2.10, upper support plate, 2.11, upper compression spring, 2.12, three-dimensional sensor, 2.13, upper sample clamp seat, 2.14, clamp, 2.15, guide rod, 2.16, lower compression spring, 2.17, upper support plate, 2.18, lower support plate, 2.19, linear bearing, 2.20, spring positioning ring, 2.21, spring positioning ring, 2.22, spring positioning ring;

[0026] 3.1, weight, 3.2, force applying rod, 3.3, strain component, 3.4, counterweight, 3.5, second support, 3.6, upper sample, 3.7, rotating shaft, 3.8, bearing;

[0027] 3.3.1, support arm, 3.3.2, intermediate arm, 3.3.3, transverse arm, 3.3.4, deformation gap, 3.3.5, deformation support portion, 3.3.6, elastic portion. DETAILED DESCRIPTION

[0028] The utility model will be further explained by non-restrictive examples and in combination with the drawings as follows:

[0029] As shown in the drawings, a reciprocating friction testing machine comprises a base 1, a workbench 4, a testing force loading mechanism, and a linear reciprocating driving mechanism.

[0030] The linear reciprocating driving mechanism comprises two first guide rails 6 arranged on the upper portion of the base 1 and a first ball screw pair 10. The first guide rails 6 are fixed on the base 1, and the first ball screw pair 10 is arranged between the two first guide rails 6 through a screw rod support 8 fixed on the base 1. The first ball screw pair 10 is driven by a reciprocating stepping motor 11. The workbench 4 is a rectangular workbench, and the workbench 4 is slidingly arranged on the upper portion of the first guide rails 6. In order to facilitate the arrangement of the workbench 4, a moving plate 5 is arranged on the lower portion of the workbench 4 in this embodiment. The workbench 4 and the moving plate 5 are detachably connected together through screws. The workbench 4 is slidingly arranged on the upper portion of the first guide rails 6 through the moving plate 5, and the nut of the first ball screw pair 10 is connected with the bottom of the moving plate 5. The screw rod of the first ball screw pair 10 is driven to rotate by the reciprocating stepping motor 11. The nut drives the moving plate and the workbench 4 to perform reciprocating linear motion along the first guide rails 6. The reciprocating displacement speed can be adjusted by adjusting the rotating speed of the reciprocating stepping motor.

[0031] The test force loading mechanism at least includes a first test force loading mechanism 2 and a second test force loading mechanism 3, and a plurality of test force loading mechanisms can also be arranged according to the test requirements. Among them, the first test force loading mechanism 2 is mainly used for tribological test under the condition of large test force loading, and the second test force loading mechanism 3 is mainly used for tribological test under the condition of small test force loading. The first test force loading mechanism 2 and the second test force loading mechanism 3 are oppositely arranged on both sides of the workbench 4. The first test force loading mechanism 2 includes a first support 2.1, a loading seat 2.9, a lifting mechanism, a spring loading mechanism, the first support 2.1 is fixed on the base 1, the first support 2.1 is provided with a vertical second guide rail 2.2, one end of the loading seat 2.9 is connected with a sliding block 2.4 slidingly arranged on the second guide rail 2.2, the spring loading mechanism is connected at the other end of the loading seat 2.9, the loading seat 2.9 is connected with the lifting mechanism, and the lower part of the spring loading mechanism is connected with a three-dimensional sensor 2.12. In the embodiment, the lifting mechanism includes a loading stepper motor 2.5, a second ball screw pair 2.3 and a belt transmission mechanism, the loading stepper motor 2.5 is fixedly arranged on the upper part of the first support 2.1, a driving pulley 2.3 is installed on the output shaft of the loading stepper motor 2.5, the second ball screw pair 2.3 is vertically rotatably arranged on the first support 2.1, a driven pulley 2.8 is installed on the driving end of the second ball screw pair 2.3, the driving pulley 2.3 and the driven pulley 2.8 are driven by a synchronous belt, and the nut of the second ball screw pair 2.3 is connected with the loading seat 2.9. In the embodiment, the spring loading mechanism includes an upper support plate 2.17 located on the upper part of the loading seat 2.9, a lower support plate 2.18 located on the lower part of the loading seat 2.9, an upper compression spring 2.11 arranged between the upper support plate 2.17 and the loading seat 2.9, and a lower compression spring 2.16 arranged between the lower support plate 2.18 and the loading seat 2.9. The upper support plate 2.17, the loading seat 2.9 and the lower support plate 2.18 are respectively provided with a spring positioning ring 2.20, a spring positioning ring 2.21 and a spring positioning ring 2.22, the two ends of the upper compression spring 2.11 are respectively connected with the upper ends of the spring positioning ring 2.20 and the spring positioning ring 2.21, the two ends of the lower compression spring 2.16 are respectively connected with the lower end of the spring positioning ring 2.21 and the spring positioning ring 2.22, one guide rod 2.15 is respectively connected between the two ends of the upper support plate 2.17 and the lower support plate 2.18, the two guide rods 2.15 are movably arranged through the loading seat 2.9, and the outer sides of the guide rods 2.15 are provided with linear bearings 2.19 for guiding, so as to ensure the stability of the test force application. The three-dimensional sensor 2.12 is connected at the bottom of the lower support plate 2.18, an upper test sample clamp seat 2.13 for installing an upper friction pair is installed at the lower end of the three-dimensional sensor 2.12, a clamp 2.14 is threadedly connected on the upper test sample clamp seat 2.13, and the clamp 2.14 can be a ball clamp or a pin clamp.When the test force is loaded, the loading mechanism is driven by the loading step motor 2.5, the second ball screw pair 2.3 is driven by the belt transmission to rotate, and then the loading seat 2.9 and the spring loading mechanism are driven to move up and down. After the spring of the spring loading mechanism is compressed, the force is applied to the clamp seat of the upper sample, forming the test force between the upper and lower sample friction surfaces. By controlling the loading step motor to drive the loading seat to move up and down, the test force can be applied and the test force can be controlled. The three-dimensional sensor 2.12 can detect the force value changes in three directions at the same time, and can collect the test force and friction force value signals in real time. The three-dimensional sensor 2.12 is a prior art and can be purchased. The second test force loading mechanism 3 is a micro test force friction force measuring mechanism, which can use any test force loading mechanism in the prior art that can load and measure micro test force friction force. In this embodiment, the second test force loading mechanism 3 includes a second support 3.5, a strain component 3.3, and a force applying rod 3.2. The second support 3.5 is fixed on the base 1 by the pad 7, and the height of the second test force loading mechanism 3 can be adjusted by adjusting the height of the pad 7 to adapt to different sample heights. The strain component 3.3 has a mountain-shaped structure, and the two arms 3.3.1 of the strain component 3.3 are provided with deformation gaps 3.3.4 along the length direction thereof. The deformation gaps 3.3.4 divide the arms 3.3.1 of the strain component 3.3 into deformation support portions 3.3.5 located on the outer side and elastic portions 3.3.6 located on the inner side. The elastic portions 3.3.6 have a thin elastic sheet structure, and the deformation support portions 3.3.5 have a relatively thick thickness. The deformation support portions 3.3.5 and the elastic portions 3.3.6 are connected at one end away from the transverse arm 3.3.3 of the strain component 3.3. The middle arm 3.3.2 of the strain component 3.3 is connected to the other end of the elastic portions 3.3.6 on the two arms 3.3.1 through the transverse arm 3.3.3. The deformation support portions 3.3.5 of the two arms of the strain component 3.3 are rotationally connected to the second support 3.5 through the rotating shaft 3.7, and the rotating shaft 3.7 is supported at both ends by the bearing 3.8. The strain component 3.3 can rotate with the rotating shaft 3.7. The force applying rod 3.2 is arranged at the end of the free end of the middle arm of the strain component 3.3, and can be fixed to the middle arm 3.3.2 by a fastening screw. The upper sample 3.6 is mounted at the lower end of the force applying rod 3.2. The second test force loading mechanism 3 adopts a weight loading, and the weight 3.1 can be arranged on the force applying rod 3.2 for test force loading. The counterweight 3.4 and the displacement sensor 12 are arranged at the two deformation support portions 3.3.5 of the strain component 3.3, respectively.When the test force is loaded, the friction force is transmitted to the elastic part on the support arm through the middle arm of the strain component, the elastic part generates a certain deformation after being stressed, and the corresponding deformation is measured through the displacement sensors on both sides, and the size of the corresponding friction force can be calculated through the difference calculation of the two deformation amounts. The structure and working principle of the strain component 3.3 in the embodiment can refer to the friction force measuring mechanism described in the patent application with the document number CN 110346071A. For easy processing, preferably, the elastic part 3.3.6 is a component independent of the deformation support part 3.3.5 and the transverse arm 3.3.3 of the strain component 3.3, and the two ends of the elastic part 3.3.6 are connected with the deformation support part 3.3.5 and the transverse arm 3.3.3 of the strain component 3.3 through screws. The elastic part 3.3.6 adopts a component independent of the deformation support part 3.3.5 and the transverse arm 3.3.3 of the strain component 3.3, that is, a separate elastic sheet, and the elastic sheet is connected with the deformation support part 3.3.5 and the transverse arm 3.3.3 of the strain component 3.3 through screws, so that the structure is simple and the processing difficulty of the strain component can be greatly reduced. The second test force loading mechanism 3 adopts a special structure of the strain component 3.3 and a weight loading to realize the measurement of the micro test force friction force, the test force range is 0.3N-10N, and the test force accuracy can reach 10mN.

[0032] In the utility model, a plurality of test force loading mechanisms can be set according to test needs. For easy installation, a plurality of second test force loading mechanism installation positions are arranged on the base 1 along the workbench movement direction, and a plurality of second test force loading mechanisms can be installed according to test needs to simultaneously carry out tribological testing.

[0033] The workbench 4 in the utility model can simultaneously clamp test samples of different geometric sizes and different contact forms, and simultaneously carry out tribological testing through a plurality of test force loading mechanisms. A square large test sample can also be clamped on the workbench 4, and tribological testing under a plurality of load conditions on the same test sample can be carried out through a plurality of test force loading mechanisms. Thus, a plurality of tribological test experiments can be realized on the same test machine, a plurality of test needs can be met, and the test efficiency is high.

[0034] The other parts in the embodiment are all prior art, and will not be described here.

Claims

1. A reciprocating friction tester comprising a base (1), a worktable (4), a test force loading mechanism, characterized in that: The base (1) is provided with a first guide rail (6) and a first ball screw pair (10) on its upper part. The worktable (4) is slidably disposed on the upper part of the first guide rail (6). The nut of the first ball screw pair (10) is connected to the bottom of the worktable (4). The first ball screw pair (10) is driven by a stepper motor. The test force loading mechanism includes at least a first test force loading mechanism (2) and a second test force loading mechanism (3). The first test force loading mechanism (2) includes a first bracket (2.2) provided with a vertical second guide rail (2.2). 2.1) Loading seat (2.9), lifting mechanism, spring loading mechanism, first bracket (2.1) fixed on base (1), one end of loading seat (2.9) connected to slider slidably set on second guide rail (2.2), spring loading mechanism connected to the other end of loading seat (2.9), loading seat (2.9) connected to lifting mechanism, three-dimensional sensor (2.12) connected to the lower part of spring loading mechanism; second test force loading mechanism (3) is a small test force friction force measuring mechanism.

2. The reciprocating friction tester of claim 1, wherein: The spring loading mechanism includes an upper support plate (2.17) located above the loading seat (2.9) and a lower support plate (2.18) located below the loading seat (2.9). Compression springs are provided between the upper support plate (2.17) and the loading seat (2.9) and between the lower support plate (2.18) and the loading seat (2.9). A guide rod is connected between the two ends of the upper support plate (2.17) and the lower support plate (2.18). The guide rods can move up and down through the loading seat (2.9), and linear bearings are provided on the outer side of the guide rods.

3. The reciprocating friction tester of claim 2, wherein: The lifting mechanism includes a loading stepper motor (2.5) fixedly mounted on the upper part of the first bracket (2.1) and a second ball screw pair (2.3) vertically mounted on the first bracket (2.1). The nut of the second ball screw pair (2.3) is connected to the loading seat (2.9), and the second ball screw pair (2.3) is connected to the loading stepper motor (2.5) through a belt drive mechanism.

4. The reciprocating friction testing machine according to claim 1, characterized in that: The second test force loading mechanism (3) includes a second support (3.5), a strain member (3.3), and a force application rod (3.2). The second support (3.5) is fixed to the base (1) by a pad. The strain member (3.3) has a mountain-shaped structure. Both arms of the strain member (3.3) are provided with deformation gaps (3.3.4) along their length. The deformation gaps (3.3.4) divide the arms of the strain member (3.3) into an outer deformation support part (3.3.5) and an inner elastic part (3.3.6). The elastic part (3.3.6) is an elastic sheet structure. The deformation support part (3.3.5) The elastic part (3.3.6) and the strain member (3.3) are connected at one end of the transverse arm (3.3.3) away from the strain member (3.3). The middle arm of the strain member (3.3) is connected to the other end of the elastic part (3.3.6) on the two arms through its transverse arm (3.3.3). The strain member (3.3) is rotatably connected to the second bracket (3.5) through the deformation support part (3.3.5) of its two arms. The force rod (3.2) is set at the end of the free end of the middle arm of the strain member (3.3). The two deformation support parts (3.3.5) of the strain member (3.3) are respectively provided with a counterweight and a displacement sensor.

5. The reciprocating friction testing machine according to claim 4, characterized in that: The elastic part (3.3.6) is a component independent of the deformation support part (3.3.5) and the transverse arm (3.3.3) of the strain member (3.3). The two ends of the elastic part (3.3.6) are respectively connected to the deformation support part (3.3.5) and the transverse arm (3.3.3) of the strain member (3.3) by screws.

6. The reciprocating friction testing machine according to any one of claims 1, 2, 3, 4, or 5, characterized in that: The first test force loading mechanism (2) and the second test force loading mechanism (3) are arranged opposite to each other on both sides of the workbench (4).

7. The reciprocating friction testing machine according to claim 6, characterized in that: Multiple installation positions for the second test force loading mechanism are provided on the base (1) along the direction of movement of the worktable.

8. The reciprocating friction testing machine according to claim 1, characterized in that: The workbench (4) is slidably mounted on the upper part of the first guide rail (6) via a movable plate (5) provided at its lower part, and the workbench (4) and the movable plate (5) are detachably connected.

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