Friction coefficient measuring equipment for rubber sealing element

Abstract

The utility model provides a friction coefficient measuring device for a rubber sealing element, which comprises a sliding rail, a friction coefficient measuring device and a friction coefficient measuring device, the normal load sliding block is connected with the sliding rail in a sliding mode, at least one first groove is formed in the bottom face of the normal load sliding block, and a to-be-tested rubber sealing element is installed in the first groove and makes contact with the contact face; and the friction force detection assembly is connected with the normal load sliding block and is used for detecting the friction force between the to-be-detected rubber sealing element and the contact surface in the process that the normal load sliding block slides from the static state to the constant-speed sliding state. According to the utility model, through integration of the load and the sensor and carrying of different contact surfaces on the operation track, the utilization rate of the rubber sealing element is improved, and the detection structure of the friction coefficient is simplified, so that the detection efficiency is improved, and the resource waste and the production cost are reduced; and different grooves are formed in the lower surface of the normal load sliding block to adapt to different rubber sealing elements, so that the friction coefficients of the different rubber sealing elements are measured.

Description

Technical Field

[0001] The utility model belongs to the technical field of sealing ring testing equipment, and particularly relates to a device for measuring the friction coefficient of rubber seals. Background Technique

[0002] Since the O-ring rubber seal has excellent sealing performance under specified temperature, pressure and different media, it has been widely used in mechanical equipment in various fields since its appearance in the 19th century. O-ring seals can be divided into static seals and reciprocating seals. One of the key factors affecting the sealing effect is the friction coefficient between the seal and the contact surface. Under a certain normal load, when two test surfaces are combined together, and a mechanical device is used to drag one surface to slide on the other surface at a certain speed, the ratio of the frictional force to the normal load is the corresponding friction coefficient.

[0003] Generally, sheet rubber specimens are the easiest to obtain, and the "plane-plane" geometric combination is closest to the actual use state. Therefore, sheet rubber is the most widely used geometric shape for measuring the friction coefficient. However, the vulcanized sheet rubber often forms an irreversible three-dimensional network system. After the friction coefficient test is completed, batches of sheet rubber can neither be reprocessed and reused nor have other uses. This is not only a waste of resources but also a potential hazard to the environment. Especially for some special rubbers with high raw material prices and high production difficulties, the discarded sheet rubber specimens increase the production cost. Content of the Utility Model

[0004] In view of the above-mentioned disadvantages of the prior art, the purpose of the present utility model is to provide a device for measuring the friction coefficient of rubber seals, so as to solve the problems that the vulcanized sheet rubber often forms an irreversible three-dimensional network system. After the friction coefficient test is completed, batches of sheet rubber can neither be reprocessed and reused nor have other uses. This is not only a waste of resources but also a potential hazard to the environment. Especially for some special rubbers with high raw material prices and high production difficulties, the discarded sheet rubber specimens increase the production cost, etc.

[0005] To achieve the above purpose and other related purposes, the present utility model provides a device for measuring the friction coefficient of rubber seals, including:

[0006] A slide rail, on which a contact surface is provided;

[0007] A normal load slider, which is slidably connected to the slide rail. At least one first groove is provided on the bottom surface of the normal load slider, and a rubber seal to be tested is installed in the first groove, and the rubber seal to be tested is in contact with the contact surface;

[0008] A friction detection component, which is connected to the normal load slider and is used to detect the friction force between the rubber seal to be tested and the contact surface during the process of the normal load slider sliding from rest to uniform speed.

[0009] In an embodiment of the present invention, the contact surface is one side of the measuring piece installed on the slide rail facing the normal load slider. The measuring piece and the slide rail are detachably connected, and the contact surfaces of different measuring pieces are different.

[0010] In an embodiment of the present invention, the normal load slider slides linearly on the slide rail.

[0011] In an embodiment of the present invention, when the rubber seal to be tested is installed in the first groove, a part of the rubber seal to be tested protrudes from the bottom surface of the normal load slider.

[0012] In an embodiment of the present invention, at least one second groove is provided on the side of the first groove, and the second groove communicates with the first groove.

[0013] In an embodiment of the present invention, at least one through hole is provided at the bottom of the first groove.

[0014] In an embodiment of the present invention, the normal load slider and the slide rail are detachably connected.

[0015] In an embodiment of the present invention, the shapes and / or sizes of different first grooves on the bottom surface of the same normal load slider are different, and the shapes and / or sizes of the first grooves on the bottom surfaces of different normal load sliders are different.

[0016] In an embodiment of the present invention, the friction detection component includes:

[0017] A connecting rod, one end of which is connected to the normal load slider;

[0018] A spring seat, which is fixedly installed on the connecting rod;

[0019] A spring, which is sleeved on the connecting rod, one end of which is connected to the spring seat, and the normal load slider is slid by stretching or compressing the spring;

[0020] A sensor, which is used to detect the elastic force during the process of stretching or compressing the spring, and the elastic force is the friction force between the rubber seal to be tested and the contact surface.

[0021] In an embodiment of the present utility model, a connecting member is provided on the normal load slider, the connecting member is connected to the connecting rod, and the acting force of the connecting rod on the connecting member is parallel to the sliding direction of the normal load slider.

[0022] The present utility model provides a friction coefficient measuring device for rubber seals. By grooving the lower surface of the normal load slider, integrating the load and the sensor, and mounting different contact surfaces on the running track, the utilization rate of the rubber seals is improved, the detection structure of the friction coefficient is simplified, thereby improving the detection efficiency and reducing resource waste and production costs.

[0023] The present utility model provides a friction coefficient measuring device for rubber seals. The friction coefficient of different materials can be obtained by replacing the contact surface, and different rubber seals can be adapted by opening grooves with different shapes and sizes on the lower surface of the normal load slider, or by replacing the normal load slider, so as to measure the friction coefficient of rubber seals with different shapes and / or different sizes. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a schematic structural diagram of the friction coefficient measuring device in an embodiment of the present utility model.

[0026] Figure 2 It is a schematic bottom surface structure diagram of the normal load slider in an embodiment of the present utility model.

[0027] Label Description:

[0028] 100, friction coefficient measuring device; 10, slide rail; 20, normal load slider; 30, friction force detection component; 11, contact surface; 21, first groove; 22, second groove; 201, through hole; 31, connecting rod; 32, spring seat; 33, spring; 23, connecting member; 231, pin shaft. Detailed Embodiments

[0029] The following describes the implementation manners of the present utility model through specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model.

[0030] It should be noted that the diagrams provided in this embodiment only illustrate the basic concept of the present utility model in a schematic manner. Therefore, only the components related to the present utility model are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0031] Please refer to Figure 1 and Figure 2 As shown, the present utility model provides a friction coefficient measuring device for a rubber seal to solve the problems that the vulcanized sheet rubber often forms an irreversible three-dimensional network system. After the friction coefficient test is completed, batches of sheet rubber can neither be reprocessed and reused nor have other use values, which is not only a waste of resources but also a potential hazard to the environment. Especially for some special rubbers with expensive raw materials and high production difficulty, the discarded sheet rubber specimens increase the production cost. Specifically, the friction coefficient measuring device 100 includes a slide rail 10, a normal load slider 20, and a friction force detection component 30. A contact surface 11 is provided on the slide rail 10. The bottom surface of the normal load slider 20 is installed with a rubber seal to be measured, and the rubber seal to be measured is in contact with the contact surface 11. And the normal load slider 20 is connected to the slide rail 10 so that the rubber seal to be measured slides on the contact surface 11. The friction force detection component 30 is connected to the normal load slider 20. The load pressure sensor 30 is used to measure the friction force between the rubber seal to be measured and the contact surface 11. The ratio between the friction force and the normal load of the normal load slider 20 on the rubber seal to be measured is the friction coefficient.

[0032] Please refer to Figure 1 and Figure 2 As shown, in this embodiment, a measuring piece is installed on the slide rail 10. The contact surface 11 is on the surface of the measuring piece facing the normal load slider 20, and the measuring piece is detachably connected to the slide rail 10. The contact surfaces 11 of different measuring pieces are different. By replacing the measuring pieces of different materials mounted on the slide rail 10 to replace the contact surface, the friction coefficients of the same rubber seal, such as an O-ring, with different contact surfaces can be obtained.

[0033] Please refer to Figure 1and Figure 2 As shown, in this embodiment, at least one first groove 21 is provided on the bottom surface of the normal load slider 20. The first groove 21 is adapted to the shape of the rubber seal to be tested, so as to facilitate the installation of the rubber seal to be tested. It can be understood that when the rubber seal to be tested is installed in the first groove 21, the rubber seal to be tested protrudes partially from the bottom surface of the normal load slider 20, that is, the depth of the first groove 21 limits the complete embedding of the rubber seal to be tested to ensure that the rubber seal can contact the contact surface 11 during the test. In this embodiment, a plurality of first grooves 21 may also be provided on the bottom surface of the normal load slider 20, and the sizes and / or shapes of the plurality of first grooves 21 are different, so as to be adapted to different rubber seals to be tested. For example, a plurality of annular grooves are provided on the bottom surface of the normal load slider 20, and the diameters and / or widths of the plurality of annular grooves are different to be adapted to different O-ring seals.

[0034] Of course, it can also be understood that the normal load slider 20 and the slide rail 10 are detachably connected, so as to facilitate the replacement of different normal load sliders 20 to provide different normal loads. At the same time, the normal load slider 20 with corresponding first grooves 21 can also be selected according to different rubber seals to be tested, so as to measure the friction coefficients of different rubber seals to be tested. In summary, the shapes and / or sizes of different first grooves 21 on the bottom surface of the same normal load slider 20 are different, and the shapes and / or sizes of the first grooves 21 on the bottom surfaces of different normal load sliders 20 are different, so as to improve the applicable range of the friction coefficient measuring device.

[0035] Please refer to Figure 1 and Figure 2 As shown, in this embodiment, at least one second groove 22 is provided on the side of the first groove 21. The second groove 22 communicates with the first groove 21, so as to facilitate the removal of the rubber seal to be tested from the first groove 21, thereby replacing the rubber seal to be tested, and at the same time, damage to the rubber seal to be tested can be avoided. In this embodiment, at least one through hole 201 may also be provided at the bottom of the first groove 21, and a set screw or other tool is passed through the through hole 201 to remove the rubber seal to be tested from the first groove 21, and damage to the rubber seal to be tested can be avoided.

[0036] Please refer to Figure 1 and Figure 2As shown, in this embodiment, the friction force detection assembly 30 is connected to the normal load slider 20 and is used to measure the friction force between the rubber seal to be tested and the contact surface 11. Specifically, the friction force detection assembly 30 includes a connecting rod 31, a spring seat 32, a spring 33 and a sensor. The connecting rod 31 is arranged parallel to the sliding direction of the normal load slider 20, and one end of the connecting rod 31 is connected to the normal load slider 20. The spring seat 32 is fixedly installed on the connecting rod 31. The spring 33 is sleeved on the connecting rod 31, and one end of it is connected to the spring seat 32. By stretching or compressing the spring 33, the spring 33 generates an elastic force. As the spring 33 is gradually stretched or compressed, the elastic force generated by it gradually increases. Since the connecting rod 31 is fixedly connected to the spring seat 32 and the normal load slider 20, and the spring seat 32 is connected by the spring 33, when the elastic force of the spring 33 increases to a certain extent, it can drive the normal load slider 20 to slide, so that the rubber seal to be tested slides on the contact surface 11. The sensor detects the elastic force during the process of stretching or compressing the spring 33. For example, when the spring 33 is compressed by pressure, the pressure sensor can detect the magnitude of the pressure. The sensor detects the stretching or compressing of the spring 33 until the elastic force during the process of driving the normal load slider 20 to slide.

[0037] It can be understood that the friction force between two objects increases as the thrust acting on the object increases. At this time, it is the static friction force. When the two objects are in the critical state of about to slide but not yet sliding, the generated friction force is the maximum static friction force. Once it exceeds the maximum value, relative sliding can occur between the two objects. At this time, it is the sliding friction force, and the sliding friction force is less than the maximum static friction force. Therefore, in this embodiment, a controller is connected to the sensor. The controller can obtain the maximum acting force during the process of stretching or compressing the spring 33 until driving the normal load slider 20 to slide according to the sensor. This acting force is the maximum static friction force between the rubber seal to be tested and the contact surface 11. The maximum static friction coefficient can be obtained according to this maximum static friction force and the normal load. After stretching or compressing the spring 33 to make the normal load slider 20 slide, the controller can obtain the acting force during the process of driving the normal load slider 20 to slide at a constant speed. This acting force is the dynamic friction force. The dynamic friction coefficient can be obtained from the dynamic friction force and the normal load.

[0038] It is understandable that a connecting member 23 is provided on the normal load slider 20. The connecting member 23 is connected to the connecting rod 31. The connecting member 23 is connected to the connecting rod 31 with a clearance fit through a pin shaft 231, so as to facilitate the disassembly and replacement of the normal load slider 20. It is also understandable that the acting force of the connecting rod 31 on the connecting member 23 is parallel to the sliding direction of the normal load slider 20. Further, the normal load slider 20 slides linearly on the slide rail 10 to ensure that the obtained frictional force is more accurate, thereby ensuring the accuracy of the friction coefficient.

[0039] The present utility model provides a friction coefficient measuring device for rubber seals. By grooving the lower surface of the normal load slider, integrating the load and the sensor, and mounting different contact surfaces on the running track, the utilization rate of the rubber seals is improved, the detection structure of the friction coefficient is simplified, thereby improving the detection efficiency and reducing resource waste and production costs.

[0040] The present utility model provides a friction coefficient measuring device for rubber seals. The friction coefficient of different materials can be obtained by replacing the contact surface. Different rubber seals can also be adapted by opening grooves with different shapes and sizes on the lower surface of the normal load slider, or by replacing the normal load slider, so as to measure the friction coefficient of rubber seals with different shapes and / or different sizes.

[0041] The above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present utility model, and should all be included in the protection scope of the present utility model.

[0042] Except for the technical features described in the specification, the rest of the technical features are known to those skilled in the art. To highlight the innovative features of the present utility model, the rest of the technical features will not be elaborated here.

Claims

1. An apparatus for measuring the coefficient of friction of a rubber seal, characterized in that, Comprising: A slide rail, on which a contact surface is provided; A normal load slider, which is slidably connected to the slide rail. At least one first groove is provided on the bottom surface of the normal load slider, and a rubber seal to be tested is installed in the first groove, and the rubber seal to be tested contacts the contact surface; A friction force detection assembly, which is connected to the normal load slider and is used to detect the friction force between the rubber seal to be tested and the contact surface during the process of the normal load slider sliding from rest to uniform motion.

2. The friction coefficient measuring device for the rubber seal according to claim 1, characterized in that, The contact surface is the surface of a measuring piece installed on the slide rail facing the normal load slider. The measuring piece is detachably connected to the slide rail, and the contact surfaces of different measuring pieces are different.

3. The friction coefficient measuring device for the rubber seal according to claim 1, characterized in that, The normal load slider slides linearly on the slide rail.

4. The friction coefficient measuring device for the rubber seal according to claim 1, characterized in that, When the rubber seal to be tested is installed in the first groove, the rubber seal to be tested partially protrudes from the bottom surface of the normal load slider.

5. The friction coefficient measuring device for the rubber seal according to claim 4, characterized in that, At least one second groove is provided on the side of the first groove, and the second groove communicates with the first groove.

6. The friction coefficient measuring device for the rubber seal according to claim 4, characterized in that, At least one through hole is provided at the bottom of the first groove.

7. The friction coefficient measuring device for the rubber seal according to claim 1, characterized in that, The normal load slider is detachably connected to the slide rail.

8. The friction coefficient measuring device for the rubber seal according to claim 4, characterized in that, The shapes and / or sizes of different first grooves on the bottom surface of the same normal load slider are different, and the shapes and / or sizes of the first grooves on the bottom surfaces of different normal load sliders are different.

9. The friction coefficient measuring device for the rubber seal according to claim 1, characterized in that The friction force detection assembly includes: A connecting rod, one end of which is connected to the normal load slider; A spring seat, which is fixedly installed on the connecting rod; A spring, which is sleeved on the connecting rod. One end of the spring is connected to the spring seat, and the spring is stretched or compressed until the normal load slider slides; A sensor, which is used to detect the elastic force during the process of stretching or compressing the spring, and the elastic force is the friction force between the rubber seal to be tested and the contact surface.

10. The friction coefficient measuring device for the rubber seal according to claim 1, characterized in that, A connecting piece is provided on the normal load slider, and the connecting piece is connected to the connecting rod. The acting force of the connecting rod on the connecting piece is parallel to the sliding direction of the normal load slider.

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