Attached micro-change sensor

Abstract

The invention discloses an attached type micro-change sensor which comprises a fixing block, two magnetic switch bases, a displacement assembly and a measuring assembly. The fixing block is a rectangular block body, first square through holes are formed in the lower end of the left side and the lower end of the right side of the front side portion of the fixing block, the vertical section of the fixing block is in a T shape, the two magnetic switch bases are fixedly located in the first square through holes in the left side and the right side of the lower end of the fixing block respectively, and the bottom of each magnetic switch base protrudes out of the bottom of the fixing block by 3 mm. The top of the fixing block is provided with a second square through hole penetrating the fixing block from top to bottom, the displacement assembly is located at the upper end in the second square through hole, and the measuring assembly is located at the lower end in the second square through hole. The device has the advantages of being convenient to install and carry, detachable at any time, reusable and capable of reducing the monitoring cost.

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 structures use micro-strain measurement methods because sensors cannot be directly installed. The deformation of the equipment or structural parts is determined by collecting the strain changes on the metal surface.

[0003] There are two common micro-strain measurement solutions on the market: The first method is to polish and grind the surface of the equipment or metal structure, directly apply glue on the polished surface and stick the resistance strain gauge, and after the glue dries, use a half-bridge or quarter-bridge collector to collect the strain signal of the strain; however, this method has three disadvantages: 1. It requires a large range of patches, usually dozens to hundreds of strain points, all of which need to be pasted with resistance strain gauges. The price of each domestic resistance strain gauge ranges from several hundred yuan, and the price of each imported resistance strain gauge is thousands of yuan, which is too costly; 2. The strain gauge is a consumable and cannot be disassembled after the glue dries, and cannot be placed in other locations or equipment for reuse; 3. In the absence of special protection for the surface patch, the strain gauge is susceptible to various influences, resulting in data deviation and easy damage; The second method is to combine the strain gauge with non-standard metal parts to make a micro-strain sensor, and fix the micro-strain sensor to the equipment or structural parts tightly by punching or welding. It is also necessary to collect the strain signal through a half-bridge, quarter-bridge or full-bridge collector. This method also has the following disadvantages: 1. The installation is cumbersome and has high requirements for installation conditions; 2. It is difficult to disassemble and reuse.

[0004] Therefore, the present invention provides a portable and reusable micro-strain sensor. Summary of the invention

[0005] 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, removable at any time, reusable, and reducing monitoring costs.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: An attached micro-variable sensor comprises a fixed block, two magnetic switch seats, a displacement component and a measuring component; The fixing block is a rectangular block, and the left lower end and the right lower end of the front side of the fixing block are both provided with a first square through hole, and the vertical section of the fixing block is in a "T" shape, and the two magnetic switch seats are respectively fixed in the first square through holes on the left side and the right side of the lower end of the fixing block, and the bottom of each magnetic switch seat protrudes 3mm from the bottom of the fixing block; The top of the fixed block is provided with a second square through-hole which passes through the top to the bottom of the fixed block, the displacement component is located at the inner upper end of the second square through-hole, and the measurement component is located at the inner lower end of the second square through-hole; The measuring assembly comprises a base and a strain module. The base is a square block. The base is slidably located at the inner lower end of the second square through-hole of the fixed block. A strain groove is provided at the bottom of the base. The strain groove is filled with silica gel. The strain module is fixed at the bottom of the silica gel. The strain module comprises a resistance strain gauge and a steel foil tape fixedly placed from top to bottom. The displacement assembly comprises a displacement block, a threaded rod, a sealing plate, and an embossed knob, the displacement block having a "convex" vertical cross-section, a threaded through-hole penetrating the top and bottom of the displacement block being provided at the middle position of the top of the displacement block, the top of the base being fixedly connected to the bottom of the displacement block, a square wire groove being provided on the left side of the top of the fixing block, the square wire groove being connected to the first square through-hole, a placement groove being provided at the top of the fixing block at the position where the square wire groove and the first square through-hole are placed, the sealing plate being fixedly located in the placement groove, a first circular through-hole being provided at the top of the sealing plate corresponding to the position of the threaded through-hole of the displacement block, the threaded rod being inserted into the first circular through-hole, the threaded rod being threadedly connected to the threaded through-hole of the displacement block, the embossed knob being fixedly connected to the upper end of the threaded rod, a first circular ring block being fixedly provided at the bottom of the sealing plate, the first circular ring block being concentric with the first circular through-hole, a second circular ring block being fixedly provided at the middle position of the threaded rod, and the top of the second circular ring block being butted against the bottom of the first circular ring block; A second circular through hole is opened on the right side of the sealing plate, an aviation socket is arranged in the second circular through hole, the lower end of the aviation socket is located in the square wire groove, and the aviation socket is electrically connected to the resistance strain gauge.

[0007] The preferred solutions are as follows: Preferably: a wiring groove is provided on the top of the base, the wiring groove runs through the left side of the base, a third circular through-hole is provided on the left side of the bottom of the displacement block, 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, 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 third circular through-hole through the wiring groove to be electrically connected to the bottom of the aviation socket.

[0008] Preferably, the bottom of the fixing block protrudes 3 mm from the bottom of the steel foil tape.

[0009] Preferably, the thickness of the steel foil tape is 0.01 mm.

[0010] Preferably: the threaded rod is integrally formed with the second annular block, the threaded rod is provided with external threads below the second annular block, the threaded rod is located above the second annular block and is cylindrical, and the upper end of the threaded rod and the part above the sealing plate is a hexagonal column.

[0011] Preferably: a third-party rectangular through-hole with an isosceles trapezoidal vertical cross-section is provided at the lower end of the left side portion of each of the magnetic switch seats, the bottom of each of the third-party rectangular through-hole is flush with the bottom of the corresponding magnetic switch seat, and the top wall of each of the third-party rectangular through-hole is flush with the bottom of the fixed block.

[0012] Preferably: a pin hole is provided at the lower end of the right side of the front side of the displacement block, a vertical waist-shaped through hole is provided at the lower end of the right side of the front side of the fixing block, a positioning pin is inserted in the pin hole, and the positioning pin is located in the waist-shaped through hole.

[0013] In summary, the present invention has the following beneficial effects: 1. Through the setting of two magnetic switch seats, the two magnetic switch seats can be better adsorbed on flat plates, round steel parts, and curved plates; 2. The setting of the steel foil tape can protect the bottom of the resistance strain gauge; 3. By filling the strain groove of the base with silicone, the resistance strain gauge can be easily deformed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front side view of the overall structural modeling schematic diagram of the embodiment; Figure 2 It is a cross-sectional view of the front and side views of the overall structural modeling schematic diagram of the embodiment; Figure 3 yes Figure 2 A magnified view of middle; Figure 4 It is the front and side view of the overall structural modeling schematic diagram of the displacement block; Figure 5 It is a front and side view of the overall structural modeling diagram of the base; Figure 6 It is a front and side view of the overall structural modeling diagram of the threaded rod.

[0015] In the figure, 1. fixed block; 2. magnetic switch seat; 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. sealing plate; 14. embossed knob; 15. first circular ring block; 16. second circular ring block; 17. aviation socket; 18. positioning pin. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0017] The same components are denoted by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings.

[0018] An attached micro-variable sensor, such as Figure 1-Figure 6 As shown, 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. The lower left end and the lower right end of the front side of the fixed block 1 are both provided with a first square through-hole. 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 3mm from the bottom of the fixed block 1. The lower left end of each magnetic switch seat 2 is provided with a third rectangular through-hole with an isosceles trapezoidal vertical section. The bottom of each third rectangular through-hole is flush with the bottom of the corresponding magnetic switch seat 2. The top wall of each third rectangular through-hole is flush with the bottom of the fixed 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 fixed 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.

[0019] A second square through hole is formed 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.

[0020] The measuring assembly 4 includes a base 6 and a strain module 7. The base 6 is a square block. The base 6 is slidably located at the inner lower end of the second square through-hole of the fixed block 1. A strain groove is provided at the bottom of the base 6. The strain groove is filled with silica gel 8. The strain module 7 is fixed at the bottom of the silica gel 8. The strain module 7 includes a resistance strain gauge 9 and a steel foil tape 10 fixedly placed from top to bottom. 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; 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 surface.

[0021] The displacement assembly 3 includes a displacement block 11, a threaded rod 12, a sealing plate 13, and an embossed knob 14; 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. A sixth circular through hole is opened at the two diagonals 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 opened 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, so that the displacement block 11 and the base 6 can be fixed.

[0022] 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, and the sealing plate 13 is fixed in the placement groove. Third threaded holes are provided at the four corners of the inner bottom wall of the placement groove, and seventh circular through-holes are 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, and 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.

[0023] A threaded through hole that penetrates 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 embossed block is integrally formed, and the threaded rod 12 is provided with an external thread below the second annular block. The length of the threaded rod 12 below the second annular block is five-sixths of the height of the threaded through hole. The threaded rod 12 is located above the second annular 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 of the fourth threaded holes. Each headless screw is abutted against the hexagonal column to complete the fixation of the embossed knob 14 to the threaded column.

[0024] 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 runs 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 perforation is provided at the bottom of the wiring groove, and the fourth circular perforation is connected to the strain groove. The connecting wire of the resistance strain gauge 9 passes through the fourth circular perforation 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 perforation to be electrically connected to the bottom of the aviation socket 17.

[0025] 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. The waist-shaped through hole and the positioning pin 18 can be used to limit the displacement distance of the displacement block 11.

[0026] Specific installation process: Step 1: Two magnetic switch seats 2 are fixedly installed in the first square through holes on the left side and the right side of the lower end of the fixing block 1 respectively; Step 2: The strain groove at the bottom of the base 6 is filled with silica gel 8, and the connecting wire of the resistance strain gauge 9 is passed through the fourth circular through hole of the base 6 to reach the wiring groove, and then the connecting wire of the resistance strain gauge 9 passes through the third circular through hole of the displacement block 11 through the wiring groove; Step 3: The base 6 is fixed at the bottom of the displacement block 11, the resistance strain gauge 9 is fixed at the bottom of the silica gel 8, and the steel foil tape 10 is fixed at the bottom of the resistance strain gauge 9; 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; 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, and 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; Step 6: The lower end of the threaded rod 12 is threadedly connected to the threaded through hole of the displacement block 11, and the embossed knob 14 is continuously rotated 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; 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 cocentric with the upper end of the waist-shaped through hole on the front side of the fixing block 1, and a positioning pin 18 is inserted into the pin hole.

[0027] Step 8: Insert an outlet aviation plug into the top of the aviation socket 17.

[0028] Specific implementation process: Step 1: Clean the surface of the workpiece to be measured to remove dirt and impurities; Step 2: Place 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; Step 3: Turn the embossed knob 14 to lower the displacement block 11, which pushes the base 6 down, and the steel foil tape 10 is tightly attached to the surface of the workpiece to be measured; 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, and the output is transmitted through the outlet aviation plug to read the change amount; Step 5: When the measurement is completed and no measurement is needed, the embossed knob 14 is rotated 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.

[0029] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. An attached micro-variable sensor, characterized in that: It comprises a fixed block (1), two magnetic switch seats (2), a displacement component (3), and a measuring component (4); The fixing block (1) is a rectangular block, and the left lower end and the right lower end of the front side of the fixing block (1) are both provided with a first square through hole, and the vertical section of the fixing 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 fixing block (1), and the bottom of each magnetic switch seat (2) protrudes 3 mm from the bottom of the fixing block; The top of the fixed block (1) is provided with a second square through-hole which passes through the top to the bottom of the fixed block, the displacement component (3) is located at the upper end of the second square through-hole, and the measurement component (4) is located at the lower end of the second square through-hole; The measuring assembly (4) comprises a base (6) and a strain module (7); the base (6) is a square block; the base (6) is slidably located at the inner lower end of the second square through-hole of the fixed block (1); a strain groove is provided at the bottom of the base (6); the strain groove is filled with silica gel (8); the strain module (7) is fixedly located at the bottom of the silica gel (8); the strain module (7) comprises 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 displacement block (11) has a vertical cross-section in a "convex" shape; 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 (6) is fixedly located in the placement groove; the sealing plate (6) is fixedly connected to the bottom of the displacement block (11); 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 circular ring block (15) is fixedly provided at the bottom of the sealing plate (13), the first circular ring block (15) is concentric with the first circular through hole, a second circular ring block (16) is fixedly provided at the middle position of the threaded rod (12), the top of the second circular ring block (16) is abutted against the bottom of the first circular ring 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), the wiring groove runs through the left side of the base (6), and a third circular through-hole is provided on the left side of the bottom of the displacement block (11), 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) is a hexagonal column.

6. The attached micro-variable sensor according to claim 1, characterized in that: A third-party 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-party through-hole being flush with the bottom of the corresponding magnetic switch seat (2), and the top wall of each third-party 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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