Friction force detection device

Abstract

The invention relates to the technical field of measuring equipment, in particular to a friction force detection device. A friction force detection device comprises a machine body, a first clamping mechanism and a second clamping mechanism, and the first clamping mechanism clamps a to-be-detected object and synchronously drives the to-be-detected object to move along the machine body along with lifting motion of a tension sensor; the second clamping mechanism comprises a second clamping seat, a left clamping block, a right clamping block and a force application part, at least two sliding grooves which are in bilateral symmetry are formed in the second clamping seat, sliding pieces are arranged in the sliding grooves, the sliding pieces can move along the sliding grooves, the sliding pieces are connected with the force application part through force transmission parts, and the force transmission parts move downwards along with the force application part. And the sliding pieces on the left and right sides can clamp an object to be detected. The device has the advantages that the sliding grooves can guide the motion path of the sliding piece, the clamping force of the left clamping block and the right clamping block is changed through the force application part so as to facilitate detection of friction force, and the two sliding grooves are bilaterally symmetrical, so that an object to be detected can be centered conveniently.

Description

Technical Field

[0001] The invention relates to the technical field of measuring equipment, in particular to a friction force detection device. Background Art

[0002] Many medical tubes, rods, wires, etc. will come into contact with human skin, blood vessels, mucous membranes and other tissues during use. In order to prevent damage to the human body, their surfaces are required to be smooth and have low friction. Therefore, their surface friction or friction coefficient needs to be measured before use.

[0003] In existing friction force detection devices, two clamping components are usually used to clamp the two ends of the object to be tested, one of which is fixed, and the other is driven by a motor to drive the transmission mechanism or manually to move it to the fixed clamping head, squeezing the object to be tested to apply the clamping force, and reading the pressure through a tension sensor. However, the cost of automatic control is high, the structure is complex, and if the surface size and shape of the product are uneven, the clamping force will fluctuate and cannot be constant, and it is difficult to center the squeezed object to be tested in both of the above methods. Summary of the invention

[0004] Based on this, the present invention provides a friction force detection device to solve the above technical problems.

[0005] A friction force detection device, the friction force detection device comprises: a body; a first clamping mechanism for clamping an object to be detected; a second clamping mechanism, the second clamping mechanism comprising a second clamping seat, a left clamping block, a right clamping block and a force-applying component, the second clamping seat is provided with at least two slide grooves distributed on the left and right, each of the slide grooves is respectively provided with at least one sliding member, and the sliding member can move along the slide groove, the sliding member in the slide groove on the left is connected to the left clamping block, and the sliding member in the slide groove on the right is connected to the right clamping block, the second clamping mechanism also comprises a force transmission component, the force-applying component and the sliding member are both connected to the force transmission component, under the action of the force applied by the force-applying component, the force transmission component can drive the sliding members on the left and right sides to move toward each other, and make the left clamping block and the right clamping block clamp the object to be detected.

[0006] In this arrangement, the machine body serves as the main bearing structure for the first clamping mechanism and the second clamping mechanism, and is used for the installation and fixation of the first clamping mechanism and the second clamping mechanism. The first clamping mechanism can clamp the object to be detected, so that the relative position between the first clamping mechanism and the object to be detected is fixed. The slide groove of the second clamping seat can guide the movement path of the sliding member to prevent the movement of the sliding member from being offset. The sliding member is connected to the left clamping block and the right clamping block. As the force-applying member pulls the force transmission member to drive the two sliding members to move toward each other, the two sliding members drive the left clamping block and the right clamping block to move toward each other, thereby clamping the object to be detected and ensuring that the object to be detected is always clamped in the center position.

[0007] In one embodiment, the slide groove passes through the second clamping seat, and the two ends of the sliding member are respectively located on the front and rear sides of the second clamping seat; wherein, one end of at least two of the sliding members is connected to the left clamping block or the right clamping block, and the other end is connected to the force transmission component.

[0008] In one embodiment, the slide groove passes through the second clamping seat, and the two ends of the sliding member are respectively located on the front and rear sides of the second clamping seat; wherein, one end of at least one of the sliding members is connected to the left clamping block, and the other end is connected to the force transmission component; one end of at least one of the sliding members is connected to the right clamping block, and the other end is connected to the force transmission component.

[0009] In one embodiment, the second clamping mechanism further includes a synchronization component, at least one of the sliding members located on the left side is connected to the synchronization component, and at least one of the sliding members located on the right side is connected to the synchronization component, and the synchronization component constrains the movement of the sliding members located on the left and right sides, and makes the sliding members located on the left and right sides always symmetrical with respect to the central axis of the second clamping seat.

[0010] In one embodiment, the slide groove is opened along the horizontal direction, or the slide groove is opened obliquely.

[0011] In one embodiment, the synchronization assembly includes a synchronization plate, which is a V-shaped structure and has a guide groove along its V-shaped extension path. At least one of the sliding members on the left side extends into the slide groove and is limited by the guide groove; at least one of the sliding members on the right side extends into the slide groove and is limited by the guide groove.

[0012] In one embodiment, the synchronization assembly includes a synchronization plate, which is a straight-line structure and has a guide groove horizontally opened therein. At least one of the sliding members on the left side extends into the slide groove and is limited by the guide groove; at least one of the sliding members on the right side extends into the slide groove and is limited by the guide groove.

[0013] In one embodiment, one end of the sliding member extending into the guide groove has an upper abutting surface and a lower abutting surface, the upper abutting surface abuts against an upper groove wall of the guide groove, and the lower abutting surface abuts against a lower groove wall of the guide groove.

[0014] In one embodiment, the synchronization assembly includes a rotating shaft and at least two synchronization rods, wherein one end of one of the synchronization rods is connected to the sliding member located on the left side, and the other end is connected to the rotating shaft; one end of the other synchronization rod is connected to the sliding member located on the right side, and the other end is connected to the rotating shaft.

[0015] In one embodiment, a pulley group is provided on the side of the second clamping seat facing away from the left clamping block and the right clamping block, the pulley group includes a plurality of pulleys, and at least one pulley is connected to the sliding member on the left side, and at least one pulley is connected to the sliding member on the right side, the force transmission component is wound around part of the side surfaces of the two pulleys, and as the force-applying component is pulled, the two pulleys connected to the left clamping block and the right clamping block can be pulled toward each other.

[0016] In one embodiment, a damping member is provided on the side of the left clamping block facing the right clamping block and on the side of the right clamping block facing the left clamping block, and the object to be detected is clamped by the damping member.

[0017] In one embodiment, the first clamping mechanism includes a first clamping seat, a driving member, a left clamping plate and a right clamping plate, the left clamping plate and the right clamping plate are arranged in the first clamping seat, the driving member is passed through the first clamping seat, the left clamping plate and the right clamping plate, and is configured to be able to control the movement of the left clamping plate and the right clamping plate by its own rotation.

[0018] In one embodiment, the first clamping mechanism also includes a guide rod, which is passed through the first clamping seat, the left clamping plate and the right clamping plate. Both ends of the driving member are respectively provided with external threads with the same pitch and opposite rotation direction, and the left clamping plate and the right clamping plate are respectively provided with internal threads, and the internal threads of the left clamping plate and the right clamping plate correspond to the pitch and rotation direction of the two ends of the driving member.

[0019] Compared with the prior art, the present invention provides symmetrical slide grooves on the second clamping seat, which can guide the movement path of the sliding member and prevent the movement of the sliding member from being offset. The sliding member is connected to the left clamping block and the right clamping block. As the force-applying member pulls the force transmission member, the two sliding members drive the left clamping block and the right clamping block to move toward each other, thereby clamping the object to be detected. The clamping force of the left clamping block and the right clamping block is proportional to the weight of the force-applying member. Therefore, changing the weight of the force-applying member can change the clamping force of the left clamping block and the right clamping block, so as to facilitate the detection of friction force. The cooperation of the force transmission member and the force-applying member enables the present application to have a more constant clamping force compared with the traditional motor-driven clamping, and the two slide grooves are symmetrical on the left and right, so it is convenient to align the object to be detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic structural diagram of a first embodiment of a friction force detection device provided by the present invention;

[0021] Figure 2 A structural schematic diagram of another perspective of the first embodiment of the friction force detection device provided by the present invention;

[0022] Figure 3 A schematic structural diagram of a second clamping mechanism according to the first embodiment of the present invention;

[0023] Figure 4 A structural schematic diagram of a second embodiment of a friction force detection device provided by the present invention;

[0024] Figure 5 A schematic structural diagram of another angle of the second embodiment of the friction force detection device provided by the present invention;

[0025] Figure 6 A schematic diagram of the structure of a third embodiment of the friction force detection device provided by the present invention;

[0026] Figure 7 It is an enlarged view of a part of the structure of the third embodiment of the friction force detection device provided by the present invention from another angle;

[0027] Figure 8 A structural schematic diagram of a fourth embodiment of a friction force detection device provided by the present invention;

[0028] Fig. 9 A schematic structural diagram of another angle of the fourth embodiment of the friction force detection device provided by the present invention;

[0029] Fig.10 A three-dimensional diagram of the first clamping mechanism of the friction force detection device provided by the present invention.

[0030] The symbols in the figure mean the following:

[0031] 100. Friction force detection device; 10. First clamping mechanism; 11. First clamping seat; 12. Driving member; 13. Left clamping plate; 14. Right clamping plate; 15. Guide rod; 20. Second clamping mechanism; 21. Second clamping seat; 211. Slide groove; 22. Left clamping block; 23. Right clamping block; 231. Damping member; 24. Sliding member; 241. Upper abutting surface; 242. Lower abutting surface; 243. Stopper; 25. Force transmission member; 26. Force applying member; 27. Pulley block; 271. Pulley; 272. First pulley; 273. Second pulley; 274. Third pulley; 28. Synchronous assembly; 281. Synchronous plate; 2811. Guide groove; 282. Synchronous rod; 283. Rotating shaft; 30. Machine body; 31. Tension sensor; 40. Object to be detected. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0033] It should be noted that when a mechanism is referred to as being "fixed to" or "set on" another mechanism, it may be directly on the other mechanism or there may be a central mechanism. When a mechanism is considered to be "connected to" another mechanism, it may be directly connected to the other mechanism or there may be a central mechanism at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0037] See also Figure 1-3 The present invention provides a friction force detection device 100 for detecting the surface friction of an object to be detected 40. For example, it is used to detect medical pipes, rods, wires, etc. that need to contact human skin, blood vessels, mucous membranes, etc. when used. In addition, it can also be used to detect other products that require surface friction, such as experimental equipment, etc., and is not limited to the field of medical supplies.

[0038] The friction force detection device 100 includes a body 30, a first clamping mechanism 10 and a second clamping mechanism 20. The friction force detection device 100 has a variety of implementation methods, for example: the first clamping mechanism 10 is connected to the body 30 through the tension sensor 31, and can clamp the object to be detected 40, and with the lifting and lowering movement of the tension sensor 31, the object to be detected 40 is synchronously driven to move along the body 30, and the second clamping mechanism 20 can also clamp the object to be detected 40, and make the object to be detected 40 in a movable state relative to the second clamping mechanism 20.

[0039] When the first clamping mechanism 10 is installed at the top and the second clamping mechanism 20 is installed at the bottom, the operation process is that the body 30 first drives the tension sensor 31, the tension sensor 31 pulls the first clamping mechanism 10, and drives the object to be detected 40 to move upward through the first clamping mechanism 10. When the object to be detected 40 is in a state of uniform upward movement, the force measured by the tension sensor 31 is the friction force between the object to be detected 40 and the second clamping mechanism 20.

[0040] Of course, in other embodiments, the first clamping mechanism 10 can be installed at the bottom, and the second clamping mechanism 20 can be installed at the top. When the object to be detected 40 is a rigid material, the first clamping mechanism 10 can be driven by the body 30, and the first clamping mechanism 10 pushes up or pulls down the object to be detected 40. The movement direction of the object to be detected 40 is not limited. As long as it is in a state of uniform speed operation, the tension sensor 31 can measure its friction force. The difference is that when the tension sensor 31 is located at the bottom of the object to be detected 40, the tension sensor 31 acts as a pressure sensor, so the force measured by the tension sensor 31 needs to be subtracted from the self-gravity of the object to be detected 40 to obtain the friction force.

[0041] It can be understood that in other embodiments, the friction force detection device 100 may not be provided with the tension sensor 31, but the force-applying component 26 is suspended on the object to be detected 40. In this embodiment, the force-applying component 26 is preferably a weight, so as to read and record the tension applied by the force-applying component 26 to the object to be detected 40. When the tension provided by the force-applying component 26 is small, the object to be detected 40 is in a stationary state. At this time, the gravity of the force-applying component 26, that is, the tension, is less than the friction between the object to be detected 40 and the second clamping mechanism 20. When the object to be detected 40 is in a uniform sliding state, it means that the tension provided by the force-applying component 26 at this time is the friction between the object to be detected 40 and the second clamping mechanism 20. When the object to be detected 40 is in an accelerated sliding state, it means that the tension provided by the force-applying component 26 at this time is greater than the friction between the object to be detected 40 and the second clamping mechanism 20.

[0042] Similarly, the force-applying component 26 is not necessarily connected to the object to be detected 40, but can also be connected to the second clamping mechanism 20. That is to say, the first clamping mechanism 10 and the object to be detected 40 are kept stationary, and the second clamping mechanism 20 clamps the object to be detected 40. When the second clamping mechanism 20 is in a stationary state, it means that the gravity received by the second clamping mechanism 20 itself is less than the friction between it and the object to be detected 40. When the second clamping mechanism 20 continuously increases the force-applying component 26 (such as a weight) and is in a state of uniform sliding, it can be said that the friction between the second clamping mechanism 20 and the object to be detected 40 is equal to the sum of the gravity of the second clamping mechanism 20 and the force-applying component 26.

[0043] In summary, it can be understood that the positions of the first clamping mechanism 10 and the second clamping mechanism 20 can be interchanged, and the essential principle is to calculate the friction between the object to be detected 40 and the second clamping mechanism 20 by observing the motion state of the object to be detected 40 or the component on which the force-applying component 26 is suspended. The configuration methods are not listed here one by one, and in the present invention, the first clamping mechanism 10 is on the top, the second clamping mechanism 20 is on the bottom, and a tension sensor 31 is added to the upper end of the first clamping mechanism 10 as an example, and is described in detail.

[0044] The first clamping mechanism 10 is connected to the body 30 through the tension sensor 31, and can clamp the object to be detected 40, and with the lifting and lowering movement of the tension sensor 31, synchronously drive the object to be detected 40 to move along the body 30, the second clamping mechanism 20 includes a second clamping seat 21, a left clamping block 22, a right clamping block 23 and a force-applying component 26, and the second clamping seat 21 is provided with at least two slide grooves 211 distributed on the left and right, and each slide groove 211 is respectively provided with a sliding member 24, and the sliding member 24 can move along The slide groove 211 moves, the sliding member 24 in the slide groove 211 on the left side is connected to the left clamping block 22, and the sliding member 24 in the slide groove 211 on the right side is connected to the right clamping block 23. The second clamping mechanism 20 also includes a force transmission component 25, and the force-applying component 26 and the sliding member 24 are both connected to the force transmission component 25. As the force of the force-applying component 26 changes, the force transmission component 25 can drive the sliding members 24 on the left and right sides to move toward each other, and enable the left clamping block 22 and the right clamping block 23 to clamp the object to be detected 40.

[0045] In this way, the machine body 30 serves as the main bearing structure for bearing the first clamping mechanism 10 and the second clamping mechanism 20, and is used for installing and fixing the first clamping mechanism 10 and the second clamping mechanism 20. The first clamping mechanism 10 can clamp the object to be detected 40, so that the relative position between the first clamping mechanism 10 and the object to be detected 40 is fixed, and the first clamping seat 11 is connected to the machine body 30 through the tension sensor 31. When the machine body 30 drives the tension sensor 31 to rise, the tension sensor 31 can pull the first clamping seat 11 and the object to be detected 40 fixed on the first clamping seat 11 to rise together. At this time, the pressure detected on the tension sensor 31 is the friction between the object to be detected 40 and the second clamping mechanism 20. The slide groove 211 of the second clamping seat 21 can guide the movement path of the sliding member 24 to prevent the movement of the sliding member 24 from being offset. The sliding member 24 is connected to the left clamping block 22 and the right clamping block 23. As the force-applying component 26 pulls the power transmission component 25 to drive the two sliding members 24 to move toward each other, the two sliding members 24 drive the left clamping block 22 and the right clamping block 23 to move toward each other, thereby clamping the object 40 to be detected.

[0046] It should be explained that the object to be detected 40 is a rod or a strip, and the first clamping mechanism 10 and the second clamping mechanism 20 are arranged along the vertical direction. In this way, the force exerted by the first clamping mechanism 10 on the object to be detected 40 and the force exerted by the second clamping mechanism 20 on the object to be detected 40 are located on the same vertical line, ensuring that the state of the object to be detected 40 is always vertically downward, thus ensuring the accuracy of the friction force measured.

[0047] Exemplarily, the force-applying component 26 is a gravity component, such as a weight or a weight, which applies a pulling force to the force-conducting component 25 by its own gravity, and can ensure the constancy of the pulling force. The cooperation of the gravity component enables the present application to have a more constant clamping force compared to the traditional motor-driven clamping, and the two slide grooves 211 are symmetrical on the left and right, so it is convenient to align the object to be detected 40. Of course, in other embodiments, the force-applying component 26 can also be a motor or manual pulling component, not limited to the above-mentioned gravity component.

[0048] It should be explained that, in the present invention, the meaning of centering is to center the position of the object to be detected 40, more specifically, to keep the position of the object to be detected 40 on the central axis of the first clamping mechanism 10 and the second clamping mechanism 20, so that the first clamping mechanism 10 and the second clamping mechanism 20 and the object to be detected 40 are in the same straight line, which makes the measurement of friction more accurate.

[0049] For example, the force transmission component 25 is preferably a traction rope in this embodiment, which has low cost, wide application scenarios and good durability. It can be understood that in other embodiments, the force transmission component 25 can also adopt a rigid connection structure such as a connecting plate, rather than being limited to a traction rope.

[0050] For example, in this embodiment, the sliding member 24 is configured as a pin, and the slide groove 211 is configured as a straight groove that matches the pin, and the pin can slide and roll in the slide groove 211, reducing the friction between the slide groove 211 and the groove wall, and is limited and guided by the groove wall of the slide groove 211. In other embodiments, the sliding member 24 can also be configured as a sliding block with a rectangular cross section that can be along the slide groove 211, etc., and is not limited to the above-mentioned pin.

[0051] The slide slot 211 passes through the second clamping seat 21, and the two ends of the sliding member 24 are respectively located at the front and rear sides of the second clamping seat 21, wherein one end of at least one sliding member 24 is connected to the left clamping block 22, and the other end is connected to the force transmission component 25; one end of at least one sliding member 24 is connected to the right clamping block 23, and the other end is connected to the force transmission component 25. In this way, the left clamping block 22 and the right clamping block 23, the force transmission component 25 and the force application component 26 are respectively located at the front and rear sides of the second clamping seat 21, and do not interfere with each other during the working process of the second clamping seat 21, thereby ensuring the smooth operation of the device and facilitating the assembly and layout of the various components of the second clamping mechanism 20.

[0052] Of course, in other embodiments, the various components of the second clamping seat 21 including the left clamping block 22, the right clamping block 23, the force-applying component 26 and the force-transmitting component 25 can also be arranged on the same side, so as to facilitate the observation of the left clamping block 22 and the right clamping block 23 and the object to be detected 40 during operating steps such as adjusting the weight of the force-applying component 26.

[0053] A pulley block 27 is provided on the side of the second clamping seat 21 facing away from the left clamping block 22 and the right clamping block 23. The pulley block 27 includes a plurality of pulleys 271, and at least one pulley 271 is connected to the left sliding member 24, and at least one pulley 271 is connected to the right sliding member 24. The force transmission component 25 is wound around part of the side surfaces of the two pulleys 271, and the two pulleys 271 can be pulled toward each other with the traction of the force-applying component 26. In this way, the force transmission component 25 pulls the sliding member 24 by cooperating with the pulley 271, and the pulling direction of the force transmission component 25 will be guided by the pulley block 27, and is not easily offset.

[0054] It should be explained that there are many ways to arrange the pulley block 27. Please refer to the following specific embodiments for detailed description, which will not be repeated here.

[0055] It can be understood that in other embodiments, the force transmission component 25 can be directly connected to the sliding member 24 instead of through the pulley 271 to reduce processing and material costs, reduce the difficulty of process and assembly, and the direct connection can make the transmission of traction force more direct.

[0056] The second clamping mechanism 20 also includes a synchronization component 28, at least one sliding member 24 located on the left is connected to the synchronization component 28, at least one sliding member 24 located on the right is connected to the synchronization component 28, and the synchronization component 28 constrains the movement of the sliding members 24 located on the left and right sides, and makes the sliding members 24 located on the left and right sides always symmetrical with respect to the central axis of the second clamping seat 21. In this way, it is ensured that even if the left clamping block 22 and the right clamping block 23 are subjected to force successively, it will not cause a situation that one has already contacted the object to be detected 40, but the other has not yet contacted it, that is to say, it is avoided that the object to be detected 40 is offset due to the different speeds of the two, and the centering is guaranteed.

[0057] It should be explained that the synchronization component 28 can make the left and right sliding members 24 symmetrical by constraining the motion state of the two so that the motion speeds of the two are consistent, that is, the position changes of the two are also relatively synchronized, thereby achieving left-right symmetry between the two.

[0058] There are many embodiments for arranging the second clamping mechanism 20 including its synchronization component 28, which are described one by one here.

[0059] Embodiment 1

[0060] See also Figure 1-3In the first embodiment, four obliquely extending slide grooves 211 are provided on the second clamping seat 21, and the four slide grooves 211 are respectively arranged on the left and right sides of the second clamping seat 21 along the horizontal direction, that is, two slide grooves 211 are located on the left side of the second clamping seat 21, and two slide grooves 211 are located on the right side of the second clamping seat 21, and they are symmetrically arranged in pairs to facilitate the centering of the second clamping seat 21.

[0061] Four pin shafts are used as four sliding members 24 inserted into four slide grooves 211, and both ends of each sliding member 24 protrude from both sides of the slide groove 211. The two sliding members 24 on the left side are connected to the left clamping block 22, and the two sliding members 24 on the right side are connected to the right clamping block 23, thereby improving the movement stability of the left clamping block 22 and the right clamping block 23.

[0062] See also Figure 2 In this embodiment, the pulley group 27 includes 6 pulleys 271, which are arranged in pairs along the vertical direction, including a first pulley 271, a second pulley 271 and a third pulley 271. Specifically, the two first pulleys 271 are respectively connected to the two sliding members 24 near the middle position of the second clamping seat 21, the two second pulleys 271 are arranged on the lower side of the two first pulleys 271, and the two third pulleys 271 are arranged on the lower side of the two second pulleys 271, and the distance between the two third pulleys 271 is smaller than the distance between the two second pulleys 271. When the left clamping block 22 and the right clamping block 23 are in the clamping state, the distance between the two first pulleys 271 is also smaller than the distance between the two second pulleys 271. In this way, the force transmission component 25 can be wound between the pulleys 271 and tensioned. The force transmission component 25 is wound around the outer sides of the two first pulleys 271 that are away from each other, and the outer sides of the two second pulleys 271 that are away from each other, and extends and fits onto the outer sides of the two third pulleys 271. As the force-applying component 26 pulls the force transmission component 25 downward, the force transmission component 25 causes the outer sides of the first pulleys 271 to be subjected to force, thereby driving the left clamping block 22 and the right clamping block 23 to move toward each other and clamp.

[0063] Embodiment 2

[0064] See also Figure 4-5In this embodiment, the slide groove 211 is opened along the horizontal direction, and the synchronization component 28 includes a synchronization plate 281. The synchronization plate 281 is a V-shaped structure and is provided with a guide groove 2811 opened along its V-shaped extension path. At least one sliding member 24 located on the left side extends into the slide groove 211 and is limited by the guide groove 2811; at least one sliding member 24 located on the right side extends into the slide groove 211 and is limited by the guide groove 2811. In this way, since the slide groove 211 is opened along the horizontal direction, the up and down displacement components of the left clamping block 22 and the right clamping block 23 during the movement are avoided, and the influence of the gravity of the synchronization component 28 on the left clamping block 22 and the right clamping block 23 is reduced, so that the force brought to the left clamping block 22 and the right clamping block 23 by the force transmission component 25 is closer to the weight of the force application component 26, the controllability and accuracy of the clamping force are higher, and the friction test data is more accurate and reliable. It can also be applied to some situations where higher requirements are placed on the upper and lower positions of the left clamping block 22 and the right clamping block 23 .

[0065] Specifically, in this embodiment, there are two slide grooves 211, which are respectively opened on the left and right sides of the second clamping seat 21, and two sliding members 24 are arranged in each slide groove 211, that is, a total of four sliding members 24 are arranged. In this embodiment, the clamping seat is also provided with a pulley set 27, and the two first pulleys 271 are respectively connected to the left and right sliding members 24 located on the inner side, and the second pulley 271, the third pulley 271, the force transmission component 25 and the force application component 26 are arranged in the same manner as in the first embodiment, and are not repeated here. The difference is that the left and right sliding members 24 located near the outer side extend into the guide groove 2811 of the V-shaped synchronization plate 281 respectively, and in the process of lateral movement along the slide groove 211, the lateral movement speed of the left and right sliding members 24 will be limited to the same by the V-shaped synchronization plate 281.

[0066] Of course, in other embodiments, the two first pulleys 271 may be respectively connected to the left and right sliding members 24 located on the outside, and the left and right sliding members 24 located on the inside may respectively extend into the guide groove 2811 of the V-shaped synchronization plate 281, which can also realize the function without being limited to the above-mentioned connection method.

[0067] Furthermore, the sliding member 24 passes through the guide groove and partially extends out of the guide groove 2811. A stopper 243 is provided at one end of the sliding member 24 extending out of the guide groove 2811. The minimum diameter of the stopper 243 is greater than the width of the guide groove 2811 and abuts against the side of the synchronous plate 281 facing away from the second clamping seat 21. In this way, the stopper 243 can limit the synchronous plate 281 to prevent it from being separated from the sliding member 24.

[0068] In this embodiment, the stopper 243 is a disc-shaped structure. Thus, no matter how the sliding member 24 rotates, the position limit between the stopper 243 and the synchronous plate 281 will not be affected.

[0069] Embodiment 3

[0070] See also Figure 6-7 In this embodiment, the slide groove 211 is obliquely opened, the synchronization plate 281 is a straight-line structure, and a guide groove 2811 is opened horizontally, at least one sliding member 24 located on the left side extends into the slide groove 211 and is limited by the guide groove 2811, and at least one sliding member 24 located on the right side extends into the slide groove 211 and is limited by the guide groove 2811. In this way, the guide groove 2811 opened horizontally can limit the sliding member 24 extending therein to the same plane, so that the movement of the sliding member 24 in the slide groove 211 is more consistent.

[0071] Furthermore, one end of the sliding member 24 extending into the guide groove 2811 has an upper abutting surface 241 and a lower abutting surface 242, wherein the upper abutting surface 241 abuts against the upper groove wall of the guide groove 2811, and the lower abutting surface 242 abuts against the lower groove wall of the guide groove 2811. In this way, since the waist-shaped upper abutting surface 241 and the lower abutting surface 242 are both planes, and the upper groove wall and the lower groove wall of the guide groove are also planes, after the upper abutting surface 241 and the lower abutting surface 242 abut against the upper groove wall and the lower groove wall respectively, the two will no longer rotate relative to each other. In other words, when the sliding member 24 moves along the oblique slide groove 211, the synchronous plate 281 is always in a horizontal state, thereby prompting each sliding member 24 to be located on the same horizontal plane, which is conducive to the application of clamping force and the centering of the object 40 to be detected.

[0072] The cross section of the sliding member 24 may be waist-shaped, square-shaped, rectangular-shaped, etc. The cross section shape of the sliding member 24 is not limited to the above-mentioned embodiment, and it only needs to have an upper abutting surface 241 and a lower abutting surface 242 .

[0073] For example, in this embodiment, the second clamping seat 21 is provided with four oblique slide grooves 211, and each slide groove 211 is provided with a sliding member 24. Among them, one end of the two sliding members 24 located on the inner side extending out of the slide groove 211 is provided with a pulley 271, and the two sliding members 24 also extend into the guide groove 2811 and are configured to have a waist-shaped cross section, so that the pulley 271 will also be stopped by the synchronous plate 281 and is not easy to fall out.

[0074] Embodiment 4

[0075] See also Figure 8-9In this embodiment, the synchronization assembly 28 includes a rotating shaft 283 and at least two synchronization rods 282, wherein one end of one synchronization rod 282 is connected to the sliding member 24 located on the left side, and the other end is connected to the rotating shaft 283, and one end of another synchronization rod 282 is connected to the sliding member 24 located on the right side, and the other end is connected to the rotating shaft 283. In this way, when the sliding members 24 on the left and right sides are pulled and moved by the force transmission component 25, the two synchronization rods 282 can rotate relative to the rotating shaft 283, and ensure the synchronization of the movement of the two sliding members 24.

[0076] In this embodiment, the arrangement of the slide groove 211, the sliding member 24 and the pulley block 27 is similar to that of the third embodiment. The difference is that the synchronization plate 281 in the third embodiment is replaced by the synchronization rod 282 and the rotating shaft 283 in this embodiment. It can be understood that the synchronization rod 282 is not limited to two, for example, it can also be increased to four, that is, each sliding member 24 is connected to a synchronization rod 282, and the four synchronization rods 282 are connected to the same rotating shaft 283.

[0077] The above four embodiments can be combined and adjusted with each other. It can be understood that although the number of the slide grooves 211 in the above four embodiments is 2 or 4, increasing it to 6 or 8 in other embodiments does not hinder the implementation of the solution. The number of pulleys 271 can also be adaptively adjusted according to the number of sliding members 24, and is not limited to 2, 4 and 6 in the above embodiments. It is only necessary to make the left and right structures of the second clamping mechanism 20 symmetrical to ensure the constant clamping force and the stability of the centering.

[0078] In addition, the second clamping mechanism 20 further includes a damping member 231, and the side of the left clamping block 22 facing the right clamping block 23 and the side of the right clamping block 23 facing the left clamping block 22 are both provided with the damping member 231, and the object to be detected 40 is clamped by the damping member 231. In this way, the damping member 231 can simulate the working environment of the object to be detected 40, so as to more accurately measure the surface friction of the object to be detected 40.

[0079] Exemplarily, when the object to be detected 40 is a medical device for a human body, the damping member 231 may be configured to simulate skin.

[0080] See also Fig.10 The first clamping mechanism 10 includes a first clamping seat 11, a driving member 12, a left clamping plate 13 and a right clamping plate 14. The left clamping plate 13 and the right clamping plate 14 are arranged in the first clamping seat 11. The driving member 12 is arranged through the first clamping seat 11, the left clamping plate 13 and the right clamping plate 14, and is configured to control the movement of the left clamping plate 13 and the right clamping plate 14 by its own rotation. In this way, the left clamping plate 13 and the right clamping plate 14 can be clamped to the object 40 to be detected by the driving member 12, and the operation is convenient and quick.

[0081] Specifically, the first clamping seat 11 is a U-shaped structure, the left clamping plate 13 and the right clamping plate 14 are installed in the first clamping seat 11, the driving member 12 is set as a screw, and the first clamping seat 11, the left clamping plate 13 and the right clamping plate 14 are respectively provided with screw holes. The rotation of the screw can make the left clamping plate 13 and the right clamping plate 14 move relative to the first clamping seat 11, thereby realizing the center clamping of the object 40 to be detected, with a simple structure and low cost.

[0082] Furthermore, the first clamping mechanism 10 also includes a guide rod 15, which is passed through the first clamping seat 11, the left clamping plate 13 and the right clamping plate 14, so as to guide the left clamping plate 13 and the right clamping plate 14 to clamp the object 40 to be detected.

[0083] The two ends of the screw are provided with external threads with the same pitch and opposite rotation direction, and the left clamping plate 13 and the right clamping plate 14 are provided with internal threads with pitch and rotation direction corresponding to the two ends of the screw. In this way, when the screw is rotated, the left clamping plate 13 and the right clamping plate 14 can approach or move away from each other at the same speed under the constraint of the guide rod 15 and the drive of the screw, thereby realizing automatic centering clamping of the object 40 to be detected.

[0084] In other embodiments, the screw rod may also be replaced by a combination of a lead screw and a motor, etc., so as to facilitate electric control and save manpower, and is not limited to the above-mentioned screw rod implementation scheme.

[0085] Compared with the prior art, the present invention provides a symmetrical slide groove 211 on the second clamping seat 21, and the slide groove 211 can guide the movement path of the sliding member 24 to prevent the movement of the sliding member 24 from being offset. The sliding member 24 is connected to the left clamping block 22 and the right clamping block 23. As the force-applying component 26 pulls the power transmission component 25 to drive the two sliding members 24 to move toward each other, the two sliding members 24 drive the left clamping block 22 and the right clamping block 23 to move toward each other, thereby clamping the object 40 to be detected, and the force-applying component 26 is set as a gravity component, so that the clamping force of the left clamping block 22 and the right clamping block 23 is proportional to the weight of the force-applying component 26. Therefore, changing the weight of the force-applying component 26 can change the clamping force of the left clamping block 22 and the right clamping block 23, so as to facilitate the detection of friction force. The cooperation between the force transmission component 25 and the force application component 26 enables the present application to have a more constant clamping force compared to the traditional motor-driven clamping, and the two slide grooves 211 are symmetrical, so it is convenient to align the object 40 to be inspected.

[0086] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0087] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A friction force detection device, characterized in that: The friction force detection device comprises: Body (30); A first clamping mechanism (10) for clamping an object to be detected (40); The second clamping mechanism (20) comprises a second clamping seat (21), a left clamping block (22), a right clamping block (23) and a force-applying component (26). The second clamping seat (21) is provided with at least two slide grooves (211) distributed on the left and right sides. At least one sliding member (24) is respectively arranged in each of the slide grooves (211), and the sliding member (24) can move along the slide groove (211). The sliding member (24) in the slide groove (211) on the left side is connected to the left clamping block (22). The sliding member (24) in the sliding groove (211) on the right side is connected to the right clamping block (23). The second clamping mechanism (20) further comprises a force transmission component (25). The force-applying component (26) and the sliding member (24) are both connected to the force transmission component (25). Under the action of the force applied by the force-applying component (26), the force transmission component (25) can drive the sliding members (24) on the left and right sides to move towards each other, and enable the left clamping block (22) and the right clamping block (23) to clamp the object to be detected (40).

2. The friction force detection device according to claim 1, characterized in that: The sliding groove (211) passes through the second clamping seat (21), and two ends of the sliding member (24) are respectively located at the front and rear sides of the second clamping seat (21); Wherein, one end of at least one of the sliding members (24) is connected to the left clamping block (22), and the other end is connected to the force transmission component (25); One end of at least one of the sliding members (24) is connected to the right clamping block (23), and the other end is connected to the force transmission component (25).

3. The friction force detection device according to claim 2, characterized in that: The second clamping mechanism (20) further comprises a synchronization component (28), at least one of the sliding members (24) located on the left side is connected to the synchronization component (28), and at least one of the sliding members (24) located on the right side is connected to the synchronization component (28), and the synchronization component (28) constrains the movement of the sliding members (24) located on the left and right sides, and makes the sliding members (24) located on the left and right sides always symmetrical with respect to the central axis of the second clamping seat (21).

4. The friction force detection device according to claim 3, characterized in that: The slide groove (211) is opened along the horizontal direction, or the slide groove (211) is opened obliquely.

5. The friction force detection device according to claim 4, characterized in that: The synchronization component (28) includes a synchronization plate (281), which is a V-shaped structure and is provided with a guide groove (2811) along its V-shaped extension path. At least one of the sliding members (24) located on the left side extends into the slide groove (211) and is limited by the guide groove (2811); at least one of the sliding members (24) located on the right side extends into the slide groove (211) and is limited by the guide groove (2811).

6. The friction force detection device according to claim 4, characterized in that: The synchronization component (28) comprises a synchronization plate (281), the synchronization plate (281) is a straight-line structure and is provided with a guide groove (2811) in a horizontal direction. At least one of the sliding members (24) located on the left side extends into the slide groove (211) and is limited by the guide groove (2811); at least one of the sliding members (24) located on the right side extends into the slide groove (211) and is limited by the guide groove (2811).

7. The friction force detection device according to claim 6, characterized in that: One end of the sliding member (24) extending into the guide groove (2811) has an upper abutting surface (241) and a lower abutting surface (242), wherein the upper abutting surface (241) abuts against the upper groove wall of the guide groove (2811), and the lower abutting surface (242) abuts against the lower groove wall of the guide groove (2811).

8. The friction force detection device according to claim 4, characterized in that: The synchronization component (28) comprises a rotating shaft (283) and at least two synchronization rods (282), wherein one end of one of the synchronization rods (282) is connected to the sliding member (24) located on the left side, and the other end is connected to the rotating shaft (283); one end of the other synchronization rod (282) is connected to the sliding member (24) located on the right side, and the other end is connected to the rotating shaft (283).

9. The friction force detection device according to claim 2, characterized in that: A pulley group (27) is provided on the side of the second clamping seat (21) facing away from the left clamping block (22) and the right clamping block (23), and the pulley group (27) includes a plurality of pulleys (271), and at least one of the pulleys (271) is connected to the sliding member (24) on the left side, and at least one of the pulleys (271) is connected to the sliding member (24) on the right side. The force transmission component (25) is wound around part of the side surfaces of the two pulleys (271), and with the traction of the force-applying component (26), the two pulleys (271) connected to the left clamping block (22) and the right clamping block (23) can be pulled toward each other.

10. The friction force detection device according to claim 1, characterized in that: A damping member (231) is provided on the side of the left clamping block (22) facing the right clamping block (23) and on the side of the right clamping block (23) facing the left clamping block (22), and the object to be detected (40) is clamped by the damping member (231).

11. The friction force detection device according to claim 1, characterized in that: The first clamping mechanism (10) comprises a first clamping seat (11), a driving member (12), a left clamping plate (13) and a right clamping plate (14); the left clamping plate (13) and the right clamping plate (14) are arranged in the first clamping seat (11); the driving member (12) is passed through the first clamping seat (11), the left clamping plate (13) and the right clamping plate (14), and is configured to be able to control the movement of the left clamping plate (13) and the right clamping plate (14) by its own rotation.

12. The friction force detection device according to claim 11, characterized in that: The first clamping mechanism (10) further comprises a guide rod (15), wherein the guide rod (15) is passed through the first clamping seat (11), the left clamping plate (13) and the right clamping plate (14), and the two ends of the driving member (12) are respectively provided with external threads with the same pitch and opposite rotation direction, and the left clamping plate (13) and the right clamping plate (14) are respectively provided with internal threads, and the internal threads of the left clamping plate (13) and the right clamping plate (14) correspond to the pitch and rotation direction of the two ends of the driving member (12).

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