CN113109251B - Friction force measuring device - Google Patents
Friction force measuring device Download PDFInfo
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- CN113109251B CN113109251B CN202110563816.5A CN202110563816A CN113109251B CN 113109251 B CN113109251 B CN 113109251B CN 202110563816 A CN202110563816 A CN 202110563816A CN 113109251 B CN113109251 B CN 113109251B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses friction force measuring equipment, belongs to the technical field of measuring equipment, and is designed for solving the problems that a sample to be measured is bent and the like due to the fact that the sample to be measured is too thick or too thin in the existing measuring equipment. The friction force measuring equipment comprises a clamp, a pressure sensor, a first clamping piece and a second clamping piece; the automatic centering alignment device comprises a clamp, a first clamping piece and a second clamping piece, and is characterized by further comprising an automatic centering alignment assembly, wherein one part of the automatic centering alignment assembly is arranged on the clamp, the other part of the automatic centering alignment assembly is arranged on the first clamping piece and the second clamping piece, and the automatic centering alignment assembly is configured to be capable of adjusting the positions of the first clamping piece and the second clamping piece when the clamp passes through the space between the first clamping piece and the second clamping piece so that a guide wire sample to be measured is in a vertical state. The friction force measuring equipment can ensure that the guide wire sample to be measured is always in a vertical state, the first clamping piece and the second clamping piece can apply proper clamping force on the periphery of the guide wire sample to be measured, but the guide wire sample to be measured cannot be bent, and the friction force measurement is more accurate.
Description
Technical Field
The invention relates to the technical field of measuring equipment, in particular to friction measuring equipment.
Background
The friction force measuring equipment is used for testing the numerical value of the friction force by enabling a guide wire sample to be tested to reciprocate between two clamping heads which are oppositely arranged. Wherein, the size of clamping-force and constant weight are controlled accurately through increasing the weight of weight.
In two clamping heads of the existing friction force measuring equipment, one clamping head is fixedly arranged, the other clamping head is driven by a screw rod to extrude towards the fixedly arranged clamping head, and the extruding degree of the screw rod is controlled by a pressure sensor so that the pressure value applied to a guide wire sample to be measured by the two clamping heads is more accurate.
Because one of the two clamping heads is fixedly arranged, when the guide wire sample to be measured is different in thickness, the guide wire sample cannot be ensured to be in a vertical state. The guide wire sample to be measured, whether being too thin or too thick, will form an offset at the two clamping heads during measurement, and fig. 1a shows the measurement state when the guide wire sample to be measured is too thin, and fig. 1b shows the measurement state when the guide wire sample to be measured is too thick, resulting in inaccurate measurement results (e.g. large measurement value). In order to enable the guide wire sample to be measured to be in a vertical state during measurement, an operator needs to repeatedly adjust the position of the fixedly arranged clamping head, so that the labor intensity is high, and the measurement efficiency is low; the screw rod control and the pressure sensor can not be completely synchronous, and the force value of the pressure sensor can fluctuate during testing, so that the screw rod needs to be constantly adjusted in position, and the clamping force can not be stable.
Disclosure of Invention
The invention aims to provide friction force measuring equipment capable of automatically enabling a guide wire sample to be measured to be in a vertical state during measurement.
In order to achieve the purpose, the invention adopts the following technical scheme:
a friction force measuring device comprises a clamp for mounting a guide wire sample to be measured, a pressure sensor for measuring the pressure value borne by the guide wire sample to be measured, and a first clamping piece and a second clamping piece which are used for clamping two sides of the guide wire sample to be measured along the radial direction; the guide wire sample centering device comprises a clamp, a first clamping piece and a second clamping piece, and further comprises an automatic centering alignment assembly, wherein one part of the automatic centering alignment assembly is arranged on the clamp, the other part of the automatic centering alignment assembly is arranged on the first clamping piece and the second clamping piece, and the automatic centering alignment assembly is configured to adjust the positions of the first clamping piece and the second clamping piece when the clamp passes through the space between the first clamping piece and the second clamping piece so as to enable the guide wire sample to be measured to be in a vertical state.
Particularly, the automatic centering and aligning assembly comprises a first adjusting block arranged on the first clamping piece, a second adjusting block arranged on the second clamping piece, a positioning block arranged on the clamp and a driving piece used for driving the first clamping piece and the second clamping piece to move towards each other, and the positioning block can drive the first clamping piece and the second clamping piece to move away from each other when passing through the first adjusting block and the second adjusting block.
Particularly, the driving part comprises a weight block and a pulling rope, one end of the pulling rope is connected to the weight block, the other end of the pulling rope is connected to one of the first clamping part and the second clamping part, a supporting part is arranged on the other of the first clamping part and the second clamping part, and the pulling rope bypasses the supporting part and then connects the first clamping part and the second clamping part together.
In particular, the support is a fixed pulley.
Particularly, the top and the bottom of the positioning block are respectively in an acute angle structure protruding outwards.
In particular, the top and the bottom of the integral structure formed by the first adjusting block and the second adjusting block are respectively provided with a groove.
In particular, the groove is of an inward-concave acute-angle structure.
Particularly, the friction force measuring equipment further comprises an auxiliary supporting piece and an auxiliary pulling rope, wherein the auxiliary supporting piece is arranged on the fixed frame, two ends of the auxiliary pulling rope are respectively fixed on the first clamping piece and the second clamping piece, and the middle part of the auxiliary pulling rope bypasses the auxiliary supporting piece; and the two ends of the auxiliary traction rope are positioned on the same side of the auxiliary supporting piece along the moving direction of the first clamping piece and the second clamping piece.
Particularly, the fixed frame is provided with a sliding rail, and the first clamping piece and the second clamping piece are respectively connected onto the sliding rail in a sliding mode.
In particular, the friction force measuring device further comprises an air cylinder or a hydraulic cylinder for driving the clamp to reciprocate along the extending direction of the guide wire sample to be measured.
The friction force measuring equipment comprises the automatic centering alignment assembly, the automatic centering alignment assembly can adjust the positions of the first clamping piece and the second clamping piece according to the diameter of the guide wire sample to be measured, the guide wire sample to be measured is ensured to be always in a vertical state, the first clamping piece and the second clamping piece can apply proper clamping force on the periphery of the guide wire sample to be measured, the guide wire sample to be measured cannot be bent, the friction force measurement is more accurate, the use is more convenient, and the measurement efficiency is higher.
Drawings
FIGS. 1a and 1b show two measurement states of a conventional friction measuring device;
FIG. 2 is a schematic structural diagram of a friction force measuring device provided in an embodiment of the present invention;
FIG. 3 is a schematic diagram of an automatic centering assembly provided by an embodiment of the present invention;
fig. 4a, fig. 4b, fig. 4c, fig. 4d and fig. 4e are schematic views illustrating an operating state of the automatic centering alignment assembly according to the embodiment of the present invention.
In the figure:
1. a clamp; 2. a pressure sensor; 6. a guide wire sample to be tested; 31. a first clamping member; 32. a second clamping member; 41. a first adjusting block; 42. a second adjusting block; 43. positioning a block; 44. heavy material blocks; 45. a pulling rope; 46. a support member; 51. an auxiliary support; 52. an auxiliary pull rope; 53. a fixed mount; 54. a slide rail.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
The present embodiment discloses a friction force measuring apparatus for measuring a friction force value of a columnar or filamentous sample. As shown in fig. 2 and 3, the friction force measuring device comprises a clamp 1 for mounting a guide wire sample 6 to be measured, a pressure sensor 2 for measuring the pressure value borne on the guide wire sample 6 to be measured, a first clamping piece 31 and a second clamping piece 32 for clamping on two sides of the guide wire sample 6 to be measured in the radial direction, and an automatic centering alignment assembly.
One part of the self-centering alignment assembly is arranged on the clamp 1, and the other part is arranged on the first clamping piece 31 and the second clamping piece 32, and the two parts are required to be matched for use. When the clamp 1 passes through between the first clamping piece 31 and the second clamping piece 32, the automatic centering and aligning assembly can adjust the positions of the first clamping piece 31 and the second clamping piece 32 so as to enable the guide wire sample 6 to be measured to be in a vertical state.
This frictional force measuring equipment can guarantee to await measuring that seal wire sample 6 is in the vertical state all the time according to the position of the first holder 31 of thickness adjustment and the second holder 32 of the 6 diameters of seal wire sample that awaits measuring, and first holder 31 and second holder 32 can apply appropriate clamping-force but can not lead to the seal wire sample 6 bending that awaits measuring in the periphery of seal wire sample 6 that awaits measuring, and frictional force measures more accurately, and it is more convenient to use, and measurement of efficiency is higher.
The self-centering alignment assembly preferably includes a first adjustment block 41, a second adjustment block 42, a positioning block 43, and a drive member. The first adjusting block 41 is disposed on the first clamping member 31, the second adjusting block 42 is disposed on the second clamping member 32, and the positioning block 43 is disposed on the jig 1. When the positioning block 43 passes between the first adjusting block 41 and the second adjusting block 42, as shown in fig. 4a, 4b and 4c, the positioning block 43 can push the first clamping member 31 and the second clamping member 32 to move away from each other (i.e., the first clamping member 31 and the second clamping member 32 move away from each other and apart from each other); after the positioning block 43 passes through between the first adjusting block 41 and the second adjusting block 42, as shown in fig. 4d and 4e, the driving member can drive the first clamping member 31 and the second clamping member 32 to move towards each other (i.e. the first clamping member 31 and the second clamping member 32 approach each other) until the first clamping member 31 and the second clamping member 32 are attached together.
The specific shape of the driving member is not limited, and the driving member may drive the first clamping member 31 and the second clamping member 32 to move toward each other. Preferably, the driving member includes a weight block 44 and a pulling rope 45, one end of the pulling rope 45 is connected to the weight block 44, the other end of the pulling rope 45 is connected to one of the first clamping member 31 and the second clamping member 32, a supporting member 46 is disposed on the other of the first clamping member 31 and the second clamping member 32, and the pulling rope 45 passes around the supporting member 46 to connect the first clamping member 31 and the second clamping member 32 together. For greater effort, the support member 46 is preferably a fixed pulley.
As shown in fig. 3, in the present embodiment, an end of the pulling rope 45 is connected to the first clamping member 31, and the middle portion thereof passes around the supporting member 46, after the positioning block 43 passes through the space between the first adjusting block 41 and the second adjusting block 42, the weight of the weight block 44 respectively acts on the connecting point of the first clamping member 31 and the supporting member 46 on the second clamping member 32 through the pulling rope 45, so that the first clamping member 31 and the second clamping member 32 move toward the middle position at the same time, and thus the friction ends (not shown) on the first clamping member 31 and the second clamping member 32 respectively abut against the outer peripheral surface of the guide wire sample 6 to be measured, and when the guide wire sample 6 to be measured moves up and down, the friction ends can rub against the outer peripheral surface of the guide wire sample 6 to be measured.
The first clamping piece 31 and the second clamping piece 32 move towards the middle position in opposite directions, and no matter the guide wire sample 6 to be detected is thick or thin, the friction end of the first clamping piece 31 and the friction end of the second clamping piece 32 can be symmetrically arranged relative to the axis of the guide wire sample 6 to be detected, so that the guide wire sample 6 to be detected is always in a vertical state when moving between the friction end of the first clamping piece 31 and the friction end of the second clamping piece 32.
The weight of the weight 44 always acts on the first and second clamping members 31 and 32, so that the weight of the weight 44 needs to be taken into consideration when designing the clamping force. As long as through reasonable design, the fixed weight 44 can not cause the change of clamping force, and the measuring effect is more stable.
The specific shapes of the positioning block 43, the first adjusting block 41 and the second adjusting block 42 are not limited, preferably, the top and the bottom of the positioning block 43 are respectively in an acute angle structure protruding outwards, so that the first adjusting block 41 and the second adjusting block 42 below can be pushed open more easily, manual operation is reduced, and the use is more convenient.
The top and bottom of the integral structure formed by first adjusting block 41 and second adjusting block 42 form a groove, respectively, to facilitate wedging of positioning block 43 between first adjusting block 41 and second adjusting block 42. Preferably, the recess is formed in an inwardly concave acute angle shape, and only a small force is required to be applied to the recess to separate first adjustment block 41 and second adjustment block 42 from each other.
On the basis of the above structure, the friction force measuring apparatus further includes an auxiliary support 51 and an auxiliary pulling rope 52. The auxiliary supporting piece 51 is arranged on a fixing frame 53 of the friction force measuring equipment, two ends of the auxiliary pulling rope 52 are respectively fixed on the first clamping piece 31 and the second clamping piece 32, and the middle part of the auxiliary pulling rope 52 bypasses the auxiliary supporting piece 51; the two ends of the auxiliary pulling rope 52 are located on the same side of the auxiliary supporting member 51 in the direction in which the first and second clamping members 31 and 32 move.
The length of the auxiliary pulling rope 52 is constant, and as shown in fig. 3, when the positioning block 43 passes through between the first adjusting block 41 and the second adjusting block 42, the second clamping member 32 is moved to the right by the second adjusting block 42, and the distance between the connecting point on the second clamping member 32 and the auxiliary supporting member 51 increases, the distance between the first clamping member 31 and the auxiliary supporting member 51 must be shortened, so the first clamping member 31 can only move to the left. That is, the auxiliary pulling rope 52 helps the first clamping member 31 and the second clamping member 32 move away from each other, so that the pushing force required by the positioning block 43 to push the first adjusting block 41 and the second adjusting block 42 to move away from each other is reduced, and the use is more convenient.
After the positioning block 43 passes through the space between the first adjusting block 41 and the second adjusting block 42, when the pulling rope 45 makes the first clamping member 31 and the second clamping member 32 move towards the middle position, the distance between the first clamping member 31 and the auxiliary supporting member 51 tends to increase, so that the distance between the connecting point on the second clamping member 32 and the auxiliary supporting member 51 is shortened, the first clamping member 31 and the second clamping member 32 can be assisted to move towards each other, and the weight of the heavy object block 44 can be properly reduced.
The fixing frame 53 is further provided with a sliding rail 54, the first clamping piece 31 and the second clamping piece 32 are respectively connected to the sliding rail 54 in a sliding mode, the first clamping piece 31 and the second clamping piece 32 move more stably, and all structures for driving the first clamping piece 31 and the second clamping piece 32 to move can save more labor.
On the basis of the structure, the friction force measuring equipment further comprises a cylinder or a hydraulic cylinder which is used for driving the clamp 1 to reciprocate along the extension direction of the guide wire sample 6 to be measured, so that the peripheral surface of the guide wire sample 6 to be measured can be repeatedly rubbed with the friction end.
It should be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements and substitutions will now be apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (8)
1. A friction force measuring device comprises a clamp (1) for mounting a guide wire sample (6) to be measured, a pressure sensor (2) for measuring the pressure value borne by the guide wire sample (6) to be measured, and a first clamping piece (31) and a second clamping piece (32) which are used for clamping two sides of the guide wire sample (6) to be measured along the radial direction; characterized in that it further comprises an automatic centering alignment assembly, one part of the automatic centering alignment assembly is arranged on the clamp (1), the other part of the automatic centering alignment assembly is arranged on the first clamping piece (31) and the second clamping piece (32), and the automatic centering alignment assembly is configured to adjust the positions of the first clamping piece (31) and the second clamping piece (32) when the clamp (1) passes through the space between the first clamping piece (31) and the second clamping piece (32) so as to enable the guide wire sample (6) to be measured to be in a vertical state;
the automatic centering alignment assembly comprises a first adjusting block (41) arranged on the first clamping piece (31), a second adjusting block (42) arranged on the second clamping piece (32), a positioning block (43) arranged on the clamp (1) and a driving piece for driving the first clamping piece (31) and the second clamping piece (32) to move towards each other, wherein the positioning block (43) can drive the first clamping piece (31) and the second clamping piece (32) to move away from each other when passing through between the first adjusting block (41) and the second adjusting block (42);
the driving piece comprises a weight block (44) and a pulling rope (45), one end of the pulling rope (45) is connected to the weight block (44), the other end of the pulling rope (45) is connected to one of the first clamping piece (31) and the second clamping piece (32), a supporting piece (46) is arranged on the other of the first clamping piece (31) and the second clamping piece (32), and the pulling rope (45) bypasses the supporting piece (46) and then connects the first clamping piece (31) and the second clamping piece (32) together.
2. The friction force measuring apparatus according to claim 1, characterized in that the support (46) is a fixed pulley.
3. The friction force measuring apparatus according to claim 1, wherein the positioning block (43) has an acute angle shape protruding outward at the top and the bottom, respectively.
4. The friction force measuring apparatus according to any one of claims 2 to 3, wherein the top and bottom of the integrated structure of the first adjusting block (41) and the second adjusting block (42) are formed with grooves, respectively.
5. A friction force measuring device according to claim 4, wherein said groove is of an inwardly concave acute-angled configuration.
6. A friction force measuring device according to any one of claims 1 to 3, characterized by further comprising an auxiliary support (51) and an auxiliary pulling rope (52), wherein the auxiliary support (51) is disposed on a fixed frame (53), both ends of the auxiliary pulling rope (52) are respectively fixed on the first clamping member (31) and the second clamping member (32), and the middle of the auxiliary pulling rope (52) bypasses the auxiliary support (51); the two ends of the auxiliary pulling rope (52) are positioned on the same side of the auxiliary supporting piece (51) along the moving direction of the first clamping piece (31) and the second clamping piece (32).
7. Friction force measuring device according to claim 6 characterised in that the fixed frame (53) is provided with sliding rails (54), the first and second gripping members (31, 32) being slidably connected to the sliding rails (54), respectively.
8. A friction force measuring device according to any of claims 1 to 3, characterized in that it further comprises a pneumatic or hydraulic cylinder for driving the clamp (1) to reciprocate along the direction of extension of the guide wire sample (6) to be measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110563816.5A CN113109251B (en) | 2021-05-24 | 2021-05-24 | Friction force measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110563816.5A CN113109251B (en) | 2021-05-24 | 2021-05-24 | Friction force measuring device |
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| Publication Number | Publication Date |
|---|---|
| CN113109251A CN113109251A (en) | 2021-07-13 |
| CN113109251B true CN113109251B (en) | 2023-03-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110563816.5A Active CN113109251B (en) | 2021-05-24 | 2021-05-24 | Friction force measuring device |
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| CN (1) | CN113109251B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2655148A1 (en) * | 1989-11-30 | 1991-05-31 | Aerospatiale | Apparatus and method for determining the frictional characteristics of materials in contact |
| JP2008256561A (en) * | 2007-04-05 | 2008-10-23 | Fujitsu Microelectronics Ltd | Perpendicular tension type adhesion strength test machine |
| CN207873328U (en) * | 2018-01-30 | 2018-09-18 | 北京市电加工研究所 | A kind of measuring device of electric spark capillary processing wire electrode and guider frictional force |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013186060A (en) * | 2012-03-09 | 2013-09-19 | Institute Of National Colleges Of Technology Japan | Frictional force transmission/detection mechanism |
| EP3644042A1 (en) * | 2017-06-23 | 2020-04-29 | Kaken Test Center | Slip test device and slip test method |
-
2021
- 2021-05-24 CN CN202110563816.5A patent/CN113109251B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2655148A1 (en) * | 1989-11-30 | 1991-05-31 | Aerospatiale | Apparatus and method for determining the frictional characteristics of materials in contact |
| JP2008256561A (en) * | 2007-04-05 | 2008-10-23 | Fujitsu Microelectronics Ltd | Perpendicular tension type adhesion strength test machine |
| CN207873328U (en) * | 2018-01-30 | 2018-09-18 | 北京市电加工研究所 | A kind of measuring device of electric spark capillary processing wire electrode and guider frictional force |
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| Publication number | Publication date |
|---|---|
| CN113109251A (en) | 2021-07-13 |
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