A force sensor specially used for testing machine

Abstract

The utility model provides a special force sensor for testing a testing machine, and relates to the technical field of force sensors, a micro bending and compression testing machine, which comprises a testing cavity, a scale, a scale slider, an extrusion slider, and a force sensor body, which comprises a rectangular strip metal block, an extrusion deformation groove, a detachable pressure-bearing block structure, a deformation zone, and a resistance strain gauge; the adopted force sensor body has a volume size that meets metrological calibration, and can be placed in the testing cavity to withstand pressure testing, and the two ends of the rectangular strip metal block in the length direction are abutted against two scale sliders, and the lower end of the extrusion slider abuts against the upper end of the detachable pressure-bearing block structure to apply pressure, so that the pressure acts concentratedly on the extrusion deformation groove, and the extrusion deformation groove is deformed and acts on the deformation zone, and the resistance strain gauge constitutes a Wheatstone bridge to sense the micro-deformation of the deformation zone, so that its resistance value produces a linear change, and the pressure is detected, thereby ensuring the detection accuracy.

Description

Technical Field

[0001] The utility model relates to the technical field of force measuring sensors, in particular to a special force measuring sensor for testing machine detection. Background Art

[0002] The flexural and compression testing machine is a device used to test the flexural and compression resistance of items. Its use requires the installation of a force sensor to test the pressure strength of the flexural and compression testing machine.

[0003] There is a micro bending and compression testing machine with a narrow test cavity. Commonly used force sensors are not suitable for use in the micro bending and compression testing machine with a narrow test cavity, and a special force sensor is lacking. Utility Model Content

[0004] The purpose of the utility model is to provide a special force sensor for testing a testing machine. The device solves the technical problem that a conventional force sensor is not suitable for use in a micro-flexural and compressive testing machine with a narrow test cavity and a special force sensor is lacking.

[0005] The utility model provides a special force sensor for testing machine detection, a miniature bending and compression testing machine, which is provided with a test cavity, a scale, a scale slider and an extrusion slider, and the left and right sides of the scale are both slidably equipped with scale sliders.

[0006] A force sensor body, which is plugged into the test cavity;

[0007] The force sensor body comprises:

[0008] A rectangular strip of metal, with both ends in the length direction resting against the two scale sliders;

[0009] An extrusion deformation groove is provided at the upper end of the rectangular strip-shaped metal block;

[0010] A detachable pressure-bearing block structure is installed in the middle of the upper surface of the rectangular strip metal block, and the detachable pressure-bearing block structure is located above the extrusion deformation groove;

[0011] The lower end of the extrusion slider abuts against the upper end of the detachable pressure-bearing block structure to apply pressure;

[0012] A deformation zone is provided on the rectangular strip metal block, and the deformation zone is located above the extrusion deformation groove;

[0013] A resistance strain gauge is pasted and fixed in the deformation zone, and four resistance strain gauges form a Wheatstone bridge;

[0014] The resistance strain gauge is electrically connected with a signal line.

[0015] As a further optimization solution, in order to ensure the strength of the bonding, the bonding method of the resistance strain gauge is specifically high-temperature and high-pressure strong bonding.

[0016] As a further optimization solution, in order to allow the extrusion deformation groove to deform when subjected to pressure from above, the extrusion deformation groove includes:

[0017] Inclined strip-shaped through holes are provided at the upper ends of the front and rear side walls of the rectangular strip-shaped metal block;

[0018] The transverse strip through hole is opened in the middle of the front and rear side walls of the rectangular strip metal block, and the transverse strip through hole is connected with the lower end of the inclined strip through hole.

[0019] As a further optimization solution, in order to better bear the force of the extrusion deformation groove, the angle between the inclined strip through hole and the transverse strip through hole is an obtuse angle.

[0020] As a further optimization scheme, in order to cause micro-deformation in the deformation zone when the extrusion deformation groove is extruded and deformed, the Wheatstone bridge composed of the resistance strain gauge can sense the micro-deformation of the deformation zone, causing its resistance value to change linearly and detecting the pressure. The deformation zone includes:

[0021] A rectangular window is transversely opened above the front and rear side walls of the rectangular strip metal block;

[0022] The four corners of the inner wall of the rectangular window are all rounded.

[0023] As a further optimization scheme, in order to facilitate the disassembly and installation of the pressure-bearing block, the detachable pressure-bearing block structure includes:

[0024] A threaded connection hole is provided in the middle of the upper surface of the rectangular strip metal block;

[0025] A screw is threadedly connected in the threaded connection hole;

[0026] A pressure block is fixedly mounted on the upper end of the screw rod.

[0027] As a further optimization scheme, in order to make the pressure act more concentratedly on the extrusion deformation groove, a conical groove is coaxially provided on the bottom surface of the threaded connection hole, and a conical block is coaxially integrally formed with the lower end of the screw, and the conical block is inserted into the conical groove.

[0028] As a further optimization scheme, in order to concentrate the pressure and improve the effect of the pressure on the extrusion deformation groove, a V-shaped groove is longitudinally opened in the middle of the upper surface of the rectangular strip metal block, and the upper end of the threaded connection hole is connected to the V-shaped groove.

[0029] As a further optimization solution, in order to reduce the contact area with the rectangular strip metal block, the two sides of the lower end of the rectangular strip metal block are supported, and the upper end of the scale slider is longitudinally movably clamped with a first cylinder.

[0030] As a further optimization solution, in order to reduce the contact area with the rectangular strip metal block, the middle part of the upper end of the rectangular strip metal block is concentratedly extruded, and the lower end of the extrusion slider is longitudinally movably clamped with a second cylinder.

[0031] The utility model provides a special force sensor for testing machine through improvement, which has the following improvements and advantages compared with the prior art:

[0032] The volume size of the force sensor body used in the device meets the requirements of metrological calibration and can be placed in the test chamber to withstand pressure testing. The two ends of the rectangular metal strip in the length direction are abutted against two scale sliders, and the lower end of the extrusion slider abuts against the upper end of the detachable pressure-bearing block structure to apply pressure, so that the pressure is concentrated on the extrusion deformation groove, and the extrusion deformation groove deforms in the deformation zone. The resistance strain gauge forms a Wheatstone bridge to sense the micro-deformation of the deformation zone, causing its resistance value to change linearly, thereby detecting the pressure and ensuring the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 This is a schematic diagram of the structure of the force sensor main body of the utility model;

[0035] Figure 2 This is a schematic diagram of the main structure of the force sensor of the utility model;

[0036] Figure 3 It is a schematic cross-sectional view of the main structure of the force sensor of the utility model;

[0037] Figure 4 It is a schematic top view of the rectangular strip metal block structure of the utility model.

[0038] Description of reference numerals:

[0039] 1-micro bending and compression testing machine, 11-extrusion slider, 12-scale, 13-scale slider, 2-force sensor body, 21-rectangular strip metal block, 22-extrusion deformation groove, 221-inclined strip through hole, 222-transverse strip through hole, 23-detachable pressure block structure, 231-threaded connection hole, 232-screw, 233-pressure block, 24-deformation zone, 25-V-shaped groove, 3-resistance strain gauge, 4-first cylinder, 5-second cylinder. DETAILED DESCRIPTION

[0040] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0042] In the description of the present utility model, it should be understood that the terms "first" and "second" are only used for descriptive purposes, and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0043] See also Figure 1-4The utility model provides a technical solution: a special force sensor for testing machine detection, a miniature bending and compression testing machine 1, which is provided with a test cavity, a scale 12, a scale slider 13 and an extrusion slider 11, and the left and right sides of the scale 12 are slidably equipped with a scale slider 13,

[0044] The micro bending and compression tester 1 is a prior art, and the two scale sliders 13 thereon can slide on the left and right sides of the scale 12, and are used to support the two sides of the lower end of the device under test, so that the middle part of the device under test is suspended in the air. The scale slider 13 slides to adjust the position, and is suitable for devices of different sizes under test within a certain range. The extrusion slider 11 is pressed down by a matching extrusion structure to provide pressure on the middle part of the upper end of the device under test;

[0045] A force sensor body 2 is inserted into the test cavity, and the force sensor body 2 meets the metrological calibration requirements;

[0046] The force sensor body 2 comprises:

[0047] The rectangular strip metal block 21 is made of elastic metal material, and its two ends in the length direction abut against the two scale sliders 13;

[0048] The extrusion deformation groove 22 is opened at the upper end of the rectangular strip metal block 21. When the middle of the upper end of the rectangular strip metal block 21 is squeezed to a certain extent, the extrusion deformation groove 22 is deformed;

[0049] A detachable pressure-bearing block structure 23 is installed in the middle of the upper surface of the rectangular strip metal block 21, and the detachable pressure-bearing block structure 23 is located above the extrusion deformation groove 22. The detachable pressure-bearing block structure 23 bears the pressure of the extrusion slider 11, so that the pressure acts more concentratedly on the extrusion deformation groove 22;

[0050] The lower end of the extrusion slider 11 abuts against the upper end of the detachable pressure block structure 23;

[0051] The deformation zone 24 is provided on the rectangular strip metal block 21, and the deformation zone 24 is located above the extrusion deformation groove 22. After the extrusion deformation groove 22 is deformed, micro deformation will also occur in the deformation zone 24;

[0052] A resistance strain gauge 3 is pasted and fixed in the deformation zone 24, and four resistance strain gauges 3 form a Wheatstone bridge;

[0053] The resistance strain gauge 3 is electrically connected to a signal line. The resistance strain gauge 3 forms a Wheatstone bridge to sense the micro-deformation of the deformation zone, causing its resistance to change linearly, detecting the magnitude of the pressure, and transmitting the detection information to an external data display instrument through the signal line, so as to facilitate reading of the pressure value.

[0054] In some embodiments, in order to ensure the strength of the pasting, the pasting method of the resistance strain gauge 3 is specifically high-temperature and high-pressure strong pasting.

[0055] In some embodiments, in order to allow the extrusion deformation groove 22 to deform when subjected to pressure from above, the extrusion deformation groove 22 includes:

[0056] The inclined strip-shaped through holes 221 are opened at the upper ends of the front and rear side walls of the rectangular strip-shaped metal block 21;

[0057] The transverse strip through hole 222 is opened in the middle of the front and rear side walls of the rectangular strip metal block 21 , and the transverse strip through hole 222 is connected to the lower end of the inclined strip through hole 221 .

[0058] In some embodiments, in order to better bear the force of the extrusion deformation groove 22, the angle between the inclined strip through hole 221 and the horizontal strip through hole 222 is an obtuse angle.

[0059] In some embodiments, in order to cause the deformation zone 24 to be slightly deformed when the extrusion deformation groove 22 is squeezed and deformed, the Wheatstone bridge formed by the resistance strain gauge 3 can sense the slight deformation of the deformation zone, causing its resistance value to change linearly, and detecting the magnitude of the pressure. The deformation zone 24 includes:

[0060] A rectangular window is transversely opened above the front and rear side walls of the rectangular strip-shaped metal block 21;

[0061] The four corners of the inner wall of the rectangular window are all rounded to prevent cracks from forming at the corners after the rectangular window is squeezed.

[0062] In some embodiments, in order to facilitate the disassembly and installation of the pressure block 23, the detachable pressure block structure 23 includes:

[0063] A threaded connection hole 231 is provided in the middle of the upper surface of the rectangular strip metal block 21;

[0064] A screw rod 232 is threadedly connected inside the threaded connection hole 231;

[0065] A pressure block 233 is fixedly mounted on the upper end of the screw rod 232 .

[0066] In some embodiments, in order to make the pressure more concentrated on the extrusion deformation groove 22, a conical groove is coaxially provided on the bottom surface of the threaded connection hole 231, and a conical block is coaxially integrally formed with the lower end of the screw 232, and the conical block is inserted into the conical groove, so that the pressure acts downward through the tip of the conical block.

[0067] In some embodiments, in order to concentrate the pressure and improve the effect of the pressure on the extrusion deformation groove 22, a V-shaped groove 25 is longitudinally opened in the middle of the upper surface of the rectangular strip metal block 21, and the upper end of the threaded connection hole 231 is connected to the V-shaped groove 25. This V-shaped groove 25 further concentrates the extrusion applied by the pressure block 233.

[0068] In some embodiments, in order to reduce the contact surface with the rectangular strip metal block 21 , the two sides of the lower end of the rectangular strip metal block 22 are supported, and the upper end of the scale slider 13 is longitudinally movably clamped with the first cylinder 4 .

[0069] In some embodiments, in order to reduce the contact area with the rectangular strip metal block 21 , the middle part of the upper end of the rectangular strip metal block 21 is centrally extruded, and the lower end of the extrusion slider 11 is longitudinally movably clamped with the second cylinder 5 .

[0070] Working principle:

[0071] The volume size of the force sensor body 2 used meets the metrological calibration requirements and can be placed in the test chamber to withstand pressure testing. The two ends of the rectangular strip metal block 21 in the length direction are abutted against the two scale sliders 13, and the lower end of the extrusion slider 11 abuts against the upper end of the detachable pressure-bearing block structure 23 to apply pressure, so that the pressure is concentrated on the extrusion deformation groove 22, and the extrusion deformation groove 22 is deformed and acts on the deformation zone 24. The resistance strain gauge 3 forms a Wheatstone bridge to sense the micro-deformation of the deformation zone 24, causing its resistance value to change linearly, thereby detecting the pressure and ensuring the detection accuracy.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A force sensor for testing a testing machine, a miniature bending and compression testing machine (1), which is provided with a test cavity, a scale (12), a scale slider (13) and an extrusion slider (11), wherein the scale slider (13) is slidably mounted on both sides of the scale (12), and characterized in that: A force sensor body (2) is inserted into the test cavity; The force sensor body (2) comprises: A rectangular strip metal block (21), both ends of which in the length direction abut against the two scale sliders (13); An extrusion deformation groove (22) is provided at the upper end of the rectangular strip-shaped metal block (21); A detachable pressure-bearing block structure (23) is installed in the middle of the upper surface of the rectangular strip metal block (21), and the detachable pressure-bearing block structure (23) is located above the extrusion deformation groove (22); The lower end of the extrusion slider (11) abuts against the upper end of the detachable pressure-bearing block structure (23); A deformation zone (24) is provided on the rectangular strip-shaped metal block (21), and the deformation zone (24) is located above the extrusion deformation groove (22); A resistance strain gauge (3) is glued and fixed in the deformation zone (24), and four of the resistance strain gauges (3) form a Wheatstone bridge; The resistance strain gauge (3) is electrically connected to a signal line.

2. A force sensor for testing a testing machine according to claim 1, characterized in that: The sticking method of the resistance strain gauge (3) is specifically high-temperature, high-pressure strong sticking.

3. A force sensor for testing a testing machine according to claim 1, characterized in that: The extrusion deformation groove (22) comprises: Inclined strip-shaped through holes (221) are provided at the upper ends of the front and rear side walls of the rectangular strip-shaped metal block (21); A transverse strip through hole (222) is provided in the middle of the front and rear side walls of the rectangular strip metal block (21), and the transverse strip through hole (222) is connected to the lower end of the inclined strip through hole (221).

4. A force sensor for testing a testing machine according to claim 3, characterized in that: The included angle between the inclined strip-shaped through hole (221) and the transverse strip-shaped through hole (222) is an obtuse angle.

5. The force sensor for testing a testing machine according to claim 1, characterized in that: The deformation zone (24) comprises: A rectangular window is transversely opened above the front and rear side walls of the rectangular strip-shaped metal block (21); The four corners of the inner wall of the rectangular window are all rounded.

6. A force sensor for testing a testing machine according to claim 1, characterized in that: The detachable pressure bearing block structure (23) comprises: A threaded connection hole (231) is provided in the middle of the upper surface of the rectangular strip-shaped metal block (21); A screw rod (232) is threadedly connected inside the threaded connection hole (231); A pressure block (233) is fixedly mounted on the upper end of the screw rod (232).

7. A force sensor for testing a testing machine according to claim 6, characterized in that: A conical groove is coaxially formed on the bottom surface of the threaded connection hole (231), and a conical block is coaxially integrally formed on the lower end of the screw rod (232), and the conical block is inserted into the conical groove.

8. The force sensor for testing a testing machine according to claim 6, characterized in that: A V-shaped groove (25) is longitudinally provided in the middle of the upper surface of the rectangular strip-shaped metal block (21), and the upper end of the threaded connection hole (231) is connected to the V-shaped groove (25).

9. A force sensor for testing a testing machine according to claim 1, characterized in that: The upper end of the scale slider (13) is longitudinally movably clamped with a first cylinder (4).

10. A force sensor for testing a testing machine according to claim 1, characterized in that: The lower end of the extrusion slider (11) is longitudinally movably clamped with a second cylinder (5).

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