An attached micro-variable sensor

Abstract

The present invention discloses an attached micro-variable sensor, comprising a fixed block, two magnetic switch seats, a displacement assembly, and a measurement assembly. The fixed block is a rectangular block, with first square holes formed at both the left and right lower ends of the front side of the fixed block. The fixed block has a T-shaped vertical cross-section. The two magnetic switch seats are fixedly positioned within the first square holes on the left and right sides of the lower end of the fixed block, respectively. The bottom of each magnetic switch seat protrudes 3 mm from the bottom of the fixed block. A second square hole is formed at the top of the fixed block, extending from the top to the bottom of the fixed block. The displacement assembly is located at the upper end of the second square hole, and the measurement assembly is located at the lower end of the second square hole. The present invention has the advantages of being easy to install, portable, removable at any time, reusable, and reducing monitoring costs.

Description

Technical Field

[0001] The present invention relates to the technical field of micro-variable sensors, and in particular to an attached micro-variable sensor. Background Art

[0002] At present, some large equipment or large structural parts use micro-strain measurement methods because it is impossible to directly install sensors. The deformation of the equipment or structural parts is judged by collecting the strain changes on the metal surface.

[0003] There are two types of conventional microstrain measurement solutions on the market:

[0004] The first method involves polishing the surface of a device or metal structure, applying glue directly to the polished surface, and attaching a resistance strain gauge. After the glue dries, the strain signal is collected through a half-bridge or quarter-bridge collector. However, this method has three disadvantages: 1. It requires a large area of ​​patch patches, usually dozens to hundreds of strain points, all of which require a resistance strain gauge. The price of each domestic resistance strain gauge ranges from several hundred yuan, while the price of each imported resistance strain gauge is thousands of yuan, which is too expensive. 2. The strain gauge is a consumable and cannot be removed after the glue dries, making it impossible to relocate it to another location or device for reuse. 3. Without special protection for the surface patch, the strain gauge is susceptible to various influences, resulting in data deviation and easy damage.

[0005] The second method is to combine the strain gauge with non-standard metal parts to make a micro-strain sensor, which is tightly fitted to the equipment or structural parts by punching or welding. It is also necessary to use a half-bridge, quarter-bridge or full-bridge collector to collect the strain signal. This method also has the following disadvantages: 1. The installation is cumbersome and requires high installation conditions; 2. It is difficult to disassemble and reuse.

[0006] Therefore, the present invention provides a portable and reusable micro-strain sensor. Summary of the Invention

[0007] The purpose of the present invention is to provide an attached micro-variable sensor, which has the advantages of being easy to install, easy to carry, detachable at any time, reusable, and reducing monitoring costs.

[0008] The above technical objectives of the present invention are achieved through the following technical solutions:

[0009] An attached micro-variable sensor includes a fixed block, two magnetic switch seats, a displacement component, and a measurement component;

[0010] The fixing block is a rectangular block, and a first square through-hole is formed at the lower left end and the lower right end of the front side of the fixing block. The vertical cross-section of the fixing block is "T"-shaped, and the two magnetic switch seats are respectively fixed in the first square through-holes on the left and right sides of the lower end of the fixing block. The bottom of each magnetic switch seat protrudes 3mm from the bottom of the fixing block.

[0011] A second square through-hole is formed on the top of the fixing block and passes through the top to the bottom of the fixing block. The displacement component is located at the upper end of the second square through-hole, and the measurement component is located at the lower end of the second square through-hole.

[0012] The measuring assembly includes a base and a strain module. The base is a square block. The base is slidably located at the lower end of the second square through-hole of the fixed block. A strain groove is formed at the bottom of the base. The strain groove is filled with silicone. The strain module is fixed at the bottom of the silicone. The strain module includes a resistance strain gauge and a steel foil tape fixedly placed from top to bottom.

[0013] The cam is fixedly mounted on the support frame, and the cam is secured to the bottom of the support frame with an angular channel formed between the top and bottom edges of the support frame. The cam is secured to the bottom of the support frame with an angular channel formed between the top and bottom edges of the support frame.

[0014] A second circular through-hole is provided on the right side of the sealing plate. An aviation socket is provided in the second circular through-hole. The lower end of the aviation socket is located in the square wire groove. The aviation socket is electrically connected to the resistance strain gauge.

[0015] The preferred options are as follows:

[0016] Preferably, a wiring groove is provided on the top of the base, the wiring groove passes through the left side of the base, and a third circular through-hole is provided on the left side of the bottom of the displacement block, the third circular through-hole is connected to the wiring groove;

[0017] A fourth circular through-hole is provided at the bottom of the wiring groove, and the fourth circular through-hole is connected to the strain groove. The connecting wire of the resistance strain gauge passes through the fourth circular through-hole to reach the wiring groove, and then the connecting wire of the resistance strain gauge passes through the wiring groove and the third circular through-hole to be electrically connected to the bottom of the aviation socket.

[0018] Preferably, the bottom of the fixing block protrudes 3 mm from the bottom of the steel foil tape.

[0019] Preferably, the thickness of the steel foil tape is 0.01 mm.

[0020] Preferably: the threaded rod is integrally formed with the second annular block, the threaded rod is provided with an external thread below the second annular block, the threaded rod is cylindrical above the second annular block, and the upper end of the threaded rod and the part above the sealing plate is a hexagonal column.

[0021] Preferably, a third-party through-hole with an isosceles trapezoidal vertical cross-section is provided at the lower end of the left side of each magnetic switch seat, the bottom of each third-party through-hole is flush with the bottom of its corresponding magnetic switch seat, and the top wall of each third-party through-hole is flush with the bottom of the fixed block.

[0022] Preferably, a pin hole is provided at the lower right end of the front side of the displacement block, and a vertical waist-shaped through hole is provided at the lower right end of the front side of the fixing block. A positioning pin is inserted into the pin hole, and the positioning pin is located in the waist-shaped through hole.

[0023] In summary, the present invention has the following beneficial effects:

[0024] 1. The setting of two magnetic switch seats can make the two magnetic switch seats better adsorbed on flat plates, round steel parts, and curved plates;

[0025] 2. The setting of steel foil tape can protect the bottom of the resistance strain gauge;

[0026] 3. By filling the strain groove of the base with silicone, the resistance strain gauge can be easily deformed. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a front and side view of a schematic diagram of the overall structural shape of the embodiment;

[0028] Figure 2 It is a cross-sectional view of the front and side views of the overall structural modeling schematic diagram of the embodiment;

[0029] Figure 3 yes Figure 2 A magnified view of middle A;

[0030] Figure 4 It is the front and side view of the overall structural modeling diagram of the displacement block;

[0031] Figure 5 It is a front and side view of the overall structural modeling diagram of the base;

[0032] Figure 6 It is a front and side view of the overall structural modeling diagram of the threaded rod.

[0033] In the figure, 1. Fixed block; 2. Magnetic switch base; 3. Displacement assembly; 4. Measuring assembly; 6. Base; 7. Strain module; 8. Silicone; 9. Resistance strain gauge; 10. Steel foil tape; 11. Displacement block; 12. Threaded rod; 13. Closing plate; 14. Embossed knob; 15. First circular ring block; 16. Second circular ring block; 17. Aviation socket; 18. Positioning pin. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below with reference to the accompanying drawings.

[0035] The same reference numerals are used to represent the same parts. It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to directions in the accompanying drawings.

[0036] An attached micro-variable sensor, such as Figures 1-6 As shown, it includes a fixed block 1, two magnetic switch seats 2, a displacement component 3, and a measuring component 4;

[0037] The fixing block 1 is a rectangular block. A first square through-hole is provided at the lower left and right ends of the front side of the fixing block 1. The vertical cross-section of the fixing block 1 is "T"-shaped. The two magnetic switch seats 2 are respectively fixed in the first square through-holes on the left and right sides of the lower end of the fixing block 1. The bottom of each magnetic switch seat 2 protrudes 3 mm from the bottom of the fixing block 1. A third rectangular through-hole with an isosceles trapezoidal vertical cross-section is provided at the lower end of the left side of each magnetic switch seat 2. The bottom of each third rectangular through-hole is flush with the bottom of its corresponding magnetic switch seat 2. The top wall of each third rectangular through-hole is flush with the bottom of the fixing block 1. A first threaded hole is provided at the top of each magnetic switch seat 2. A fifth circular through-hole is provided on the left and right sides of the top of the fixing block 1, and a first chamfer is provided at the top of each fifth circular through-hole. A first flat head screw is provided in each fifth circular through-hole. Each first flat head screw is threadedly connected to its corresponding first threaded hole, and the screw head of each first flat head screw is located in its corresponding first chamfer.

[0038] A second square through-hole is provided on the top of the fixing block 1 and passes through the top to the bottom of the fixing block 1 . The displacement component 3 is located at the upper end of the second square through-hole, and the measuring component 4 is located at the lower end of the second square through-hole.

[0039] The measuring assembly 4 includes a base 6 and a strain module 7. The base 6 is a square block and is slidably positioned inside the lower end of the second square through-hole of the fixed block 1. A strain groove is defined at the bottom of the base 6 and is filled with silicone rubber 8. The strain module 7 is fixedly positioned at the bottom of the silicone rubber 8. The strain module 7 includes a resistance strain gauge 9 and a steel foil tape 10 fixedly positioned from top to bottom.

[0040] It is filled with silica gel 8, and the resistance strain gauge 9 is fixedly connected to the silica gel 8. The silica gel 8 is soft silica gel 8, which has high flexibility and elasticity and can adapt to slight deformation of the resistance strain gauge 9;

[0041] The thickness of the steel foil tape 10 is 0.01 mm, and the bottom of the fixing block 1 protrudes 3 mm from the bottom of the steel foil tape 10. The steel foil tape 10 protects the resistance strain gauge 9 and prevents the resistance strain gauge 9 from being damaged by small sharp particles on the measuring end face.

[0042] The displacement assembly 3 includes a displacement block 11, a threaded rod 12, a sealing plate 13, and an embossed knob 14;

[0043] The vertical cross-section of the displacement block 11 is "convex" in shape, and the top of the base 6 is fixedly connected to the bottom of the displacement block 11. Sixth circular through-holes are provided at the two diagonal positions on the left side of the bottom of the displacement block 11 and in the middle position on the right side of the bottom of the displacement block 11. Three second threaded holes corresponding to the positions of the sixth circular through-holes are provided on the top of the base 6. A bolt is provided in each sixth circular through-hole, and each bolt is threadedly connected to its corresponding second threaded hole to complete the fixation of the displacement block 11 and the base 6.

[0044] A placement groove is provided at the top of the fixing block 1 at the position between the square wire groove and the first square through-hole. The sealing plate 13 is fixed in the placement groove. A third threaded hole is provided at the four corners of the inner bottom wall of the placement groove. A seventh circular through-hole is provided at the four corners of the top of the sealing plate 13. A second chamfer is provided at the top of each seventh circular through-hole. A second flat-head screw is provided in each seventh circular through-hole. Each second flat-head screw is threadedly connected to its corresponding third threaded hole, and the screw head of each second flat-head screw is located at its corresponding second chamfer.

[0045] A threaded through-hole running through the top and bottom of the displacement block 11 is provided at the middle position of the top of the displacement block 11, a first circular through-hole is provided at the top of the sealing plate 13 corresponding to the position of the threaded through-hole of the displacement block 11, the threaded rod 12 is inserted into the first circular through-hole, the threaded rod 12 is threadedly connected to the threaded through-hole of the displacement block 11, the embossed knob 14 is fixedly connected to the upper end of the threaded rod 12, a first annular block is fixedly provided at the bottom of the sealing plate 13, the first annular block is concentric with the first circular through-hole, a second annular block 16 is fixedly provided at the middle position of the threaded rod 12, the top of the second annular block 16 is against the bottom of the first annular block 15; the first annular block and the sealing plate 13 are integrally formed, the threaded rod 12 and the second annular The blocks are integrally formed, and the threaded rod 12 is provided with an external thread below the second circular block. The length of the threaded rod 12 below the second circular block is five-sixths of the height of the threaded through-hole. The threaded rod 12 is located above the second circular block and is cylindrical. The upper end of the threaded rod 12 and the part located above the sealing plate 13 are hexagonal columns. A hexagonal through-hole corresponding to the hexagonal column is provided on the top of the embossed knob 14. The hexagonal column at the upper end of the threaded rod 12 is inserted into the hexagonal through-hole. Two fourth threaded holes are provided in a circular array on the side wall of the embossed knob 14. A headless screw is provided in each fourth threaded hole. Each headless screw is abutted against the hexagonal column to complete the fixation of the embossed knob 14 to the threaded column.

[0046] A square wire groove is provided on the left side of the top of the fixed block 1, and the square wire groove is connected to the first square through-hole. A second circular through-hole is provided on the right side of the sealing plate 13, and an aviation socket 17 is provided in the second circular through-hole. The lower end of the aviation socket 17 is located in the square wire groove, and the aviation socket 17 is electrically connected to the resistance strain gauge 9. A wiring groove is provided on the top of the base 6, and the wiring groove passes through the left side of the base 6. A third circular through-hole is provided on the left side of the bottom of the displacement block 11, and the third circular through-hole is connected to the wiring groove;

[0047] A fourth circular through-hole is provided at the bottom of the wiring groove, which is connected to the strain groove. The connecting wire of the resistance strain gauge 9 passes through the fourth circular through-hole to reach the wiring groove, and then the connecting wire of the resistance strain gauge 9 passes through the third circular through-hole through the wiring groove and is electrically connected to the bottom of the aviation socket 17.

[0048] A pin hole is provided at the lower right end of the front side of the displacement block 11, and a vertical waist-shaped through-hole is provided at the lower right end of the front side of the fixed block 1. A positioning pin 18 is inserted into the pin hole and positioned within the waist-shaped through-hole. The waist-shaped through-hole and positioning pin 18 can be used to limit the displacement distance of the displacement block 11.

[0049] Specific installation process:

[0050] Step 1: Two magnetic switch seats 2 are fixedly installed in the first square through-holes on the left and right sides of the lower end of the fixing block 1 respectively;

[0051] Step 2: Fill the strain groove at the bottom of the base 6 with silica gel 8, pass the connecting wire of the resistance strain gauge 9 through the fourth circular through-hole of the base 6 to the wiring groove, and then pass the connecting wire of the resistance strain gauge 9 through the wiring groove and through the third circular through-hole of the displacement block 11;

[0052] Step 3: The base 6 is fixed to the bottom of the displacement block 11, the resistance strain gauge 9 is fixed to the bottom of the silica gel 8, and the steel foil tape 10 is fixed to the bottom of the resistance strain gauge 9;

[0053] Step 4: The threaded rod 12 is inserted from bottom to top through the first annular block of the sealing plate 13 into the first circular through-hole, and then the knob is fixed to the threaded column;

[0054] Step 5: An aviation socket 17 is fixed in the second circular through-hole of the sealing plate 13. The base 6 is pushed upward from the bottom of the first square through-hole of the fixing block 1. The connecting wire of the resistance strain gauge 9 passes through the square wire groove and is electrically connected to the bottom of the aviation socket 17.

[0055] Step 6: The lower end of the threaded rod 12 is threadedly connected to the threaded through-hole of the displacement block 11. The embossed knob 14 is continuously turned to make the bottom of the second annular block of the threaded rod 12 abut against the top of the displacement block 11, fix the sealing plate 13 in the placement groove, and then push the base 6 downward;

[0056] Step 7: Turn the embossed knob 14 to lower the displacement block 11. The pin hole on the front side of the displacement block 11 is concentric with the upper end of the waist-shaped through hole on the front side of the fixed block 1. A positioning pin 18 is inserted into the pin hole.

[0057] Step 8: Plug the outlet aviation plug into the top of the aviation socket 17.

[0058] Specific implementation process:

[0059] Step 1: Clean the surface of the workpiece to be measured to remove dirt and impurities;

[0060] Step 2: Place the two magnetic switch seats 2 of the attached micro-variable sensor on the surface of the workpiece, turn on the magnetic switch, and the micro-variable sensor is adsorbed on the surface of the workpiece through the two magnetic switch seats 2;

[0061] Step 3: Turn the embossed knob 14 to lower the displacement block 11. The displacement block 11 pushes the base 6 down, and the steel foil tape 10 is tightly attached to the surface of the workpiece to be measured;

[0062] Step 4: When the workpiece is deformed by the external force, the resistance strain gauge 9 will also be deformed accordingly, so that the resistance value of the resistance strain gauge 9 changes. The output is transmitted through the outlet aviation plug to read the change value;

[0063] Step 5: When the measurement is completed and no measurement is needed, rotate the embossed knob 14 in the opposite direction, the displacement block 11 rises, the displacement block 11 pushes the base 6 to rise, the steel foil tape 10 is away from the surface of the workpiece to be measured, and the resistance strain gauge 9 enters the fixed block 1 for protection.

[0064] This specific embodiment is merely an explanation of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as such modifications are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. An attached micro-variable sensor, characterized in that: It includes a fixed block (1), two magnetic switch seats (2), a displacement component (3), and a measuring component (4); The fixed block (1) is a rectangular block, and a first square through-hole is provided at the lower left end and the lower right end of the front side of the fixed block (1). The vertical section of the fixed block (1) is in a "T" shape. The two magnetic switch seats (2) are respectively fixed in the first square through-holes on the left side and the right side of the lower end of the fixed block (1). The bottom of each magnetic switch seat (2) protrudes 3 mm from the bottom of the fixed block. The top of the fixed block (1) is provided with a second square through-hole that passes through the top to the bottom of the fixed block, the displacement component (3) is located at the inner upper end of the second square through-hole, and the measuring component (4) is located at the inner lower end of the second square through-hole; The measuring assembly (4) includes a base (6) and a strain module (7), wherein the base (6) is a square block, and the base (6) is slidably located at the inner lower end of the second square through-hole of the fixed block (1), and a strain groove is provided at the bottom of the base (6), and the strain groove is filled with silica gel (8). The strain module (7) is fixedly located at the bottom of the silica gel (8), and the strain module (7) includes a resistance strain gauge (9) and a steel foil tape (10) fixedly placed from top to bottom; The displacement assembly (3) comprises a displacement block (11), a threaded rod (12), a sealing plate (13), and an embossed knob (14). The vertical section of the displacement block (11) is convex. A threaded through-hole penetrating the top and bottom of the displacement block (11) is provided at the middle position of the top of the displacement block (11). The top of the base (6) is fixedly connected to the bottom of the displacement block (11). A square wire groove is provided on the left side of the top of the fixed block (1). The square wire groove is connected to the first square through-hole. A placement groove is provided at the top of the fixed block (1) at the position between the square wire groove and the first square through-hole. The sealing plate (13) is fixedly located in the placement groove. The sealing plate ( A first circular through-hole is provided at the top of the cover plate (13) corresponding to the threaded through-hole position of the displacement block (11), the threaded rod (12) is inserted into the first circular through-hole, the threaded rod (12) is threadedly connected to the threaded through-hole of the displacement block (11), the embossed knob (14) is fixedly connected to the upper end of the threaded rod (12), a first annular block (15) is fixedly provided at the bottom of the sealing plate (13), the first annular block (15) is concentric with the first circular through-hole, a second annular block (16) is fixedly provided at the middle position of the threaded rod (12), the top of the second annular block (16) is abutted against the bottom of the first annular block (15); A second circular through-hole is provided on the right side of the sealing plate (13), an aviation socket (17) is provided in the second circular through-hole, the lower end of the aviation socket (17) is located in the square wire groove, and the aviation socket (17) is electrically connected to the resistance strain gauge (9).

2. The attached micro-variable sensor according to claim 1, characterized in that: A wiring groove is provided on the top of the base (6), and the wiring groove passes through the left side of the base (6); a third circular through-hole is provided on the left side of the bottom of the displacement block (11), and the third circular through-hole is connected to the wiring groove; A fourth circular through-hole is provided at the bottom of the wiring groove, the fourth circular through-hole being connected to the strain groove, the connecting wire of the resistance strain gauge (9) passes through the fourth circular through-hole to reach the wiring groove, and then the connecting wire of the resistance strain gauge (9) passes through the wiring groove through the third circular through-hole to be electrically connected to the bottom of the aviation socket (17).

3. The attached micro-variable sensor according to claim 1, characterized in that: The bottom of the fixing block (1) protrudes 3 mm from the bottom of the steel foil tape (10).

4. The attached micro-variable sensor according to claim 1, characterized in that: The thickness of the steel foil tape (10) is 0.01 mm.

5. The attached micro-variable sensor according to claim 1, characterized in that: The threaded rod (12) and the second annular block (16) are integrally formed. The threaded rod (12) is located below the second annular block (16) and is provided with an external thread. The threaded rod (12) is located above the second annular block (16) and is cylindrical. The upper end of the threaded rod (12) and the portion located above the sealing plate (13) are hexagonal columns.

6. The attached micro-variable sensor according to claim 1, characterized in that: A third-shaped through-hole having an isosceles trapezoidal vertical cross-section is provided at the lower end of the left side of each magnetic switch seat (2), the bottom of each third-shaped through-hole being flush with the bottom of its corresponding magnetic switch seat (2), and the top wall of each third-shaped through-hole being flush with the bottom of the fixing block (1).

7. The attached micro-variable sensor according to claim 1, characterized in that: A pin hole is provided at the lower end of the right side of the front side of the displacement block (11), and a vertical waist-shaped through hole is provided at the lower end of the right side of the front side of the fixing block (1). A positioning pin (18) is inserted into the pin hole, and the positioning pin (18) is located in the waist-shaped through hole.

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