Welded strain gauge

Abstract

The utility model discloses a welding type strain gauge, comprising a strain gauge substrate and a circular tube, a strain element is sealed in the circular tube through glue solidification, the outer wall of the left end of the circular tube is provided with a housing, the inner wall of the housing is provided with a protection mechanism, the outer wall of the housing is provided with an abutting mechanism, and the abutting mechanism is provided with a clamping mechanism. The utility model relates to the technical field of strain gauges, which can drive a shell to move, so that the shell covers the section, containing a strain element, in a circular tube, and then a top block can be matched with a spring and the like to abut against a clamping block, so that the shell is fixed on the circular tube and a strain gauge substrate, and when the strain gauge substrate is welded on a piece to be measured through spot welding, the clamping block can be tightly pressed against the clamping block. Due to the fact that the first heat insulation layer, the second heat insulation layer and the third heat insulation layer are arranged in the shell, the three layers of heat insulation materials are matched with the shell and the round pipe, protection and heat insulation can be conducted on the internal strain element, and damage to the strain element caused by welding spots and high temperature generated during welding is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of strain gauges, in particular to a welding strain gauge. Background Art

[0002] Welded strain gauges are a special type of resistance strain gauge that inherits the typical characteristics of general resistance strain gauges and is particularly suitable for precise stress measurement and analysis of metal components. Welded strain gauges are suitable for long-term installation in hydraulic structures or other concrete structures to measure linear deformation and stress at the buried point. When using them, they must first be installed on the test piece through operations such as spot welding.

[0003] However, in conventional welded strain gauges, due to the lack of protective structures on the strain element during welding, welding sparks can easily strike the strain element. Conventional strain gauge strain elements, such as the HCY series, can withstand a maximum temperature of 150°C, while the instantaneous temperature generated by welding sparks is much higher than this. Therefore, the strain element is very easily damaged. In view of this, it is very necessary to design a welded strain gauge to solve this problem. Utility Model Content

[0004] In response to the shortcomings of the existing technology, the utility model provides a welded strain gauge, which solves the problem that the welded strain gauge in the existing technology has no protective structure provided on the strain element of the strain gauge, so the welding sparks generated during electric welding can easily hit the strain element and cause damage to it.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a welded strain gauge, comprising a strain gauge substrate and a circular tube, wherein the front end surface of the strain gauge substrate is welded to the circular tube, the interior of the circular tube is sealed with a strain element by curing glue, a housing is mounted on the outer wall of the left end of the circular tube, a protective mechanism is mounted on the inner wall of the housing, and a tightening mechanism is mounted on the outer wall of the housing;

[0006] The protection mechanism includes a first insulation layer bonded to the inner wall of the shell, a second insulation layer bonded to the inner wall of the first insulation layer, a third insulation layer bonded to the inner wall of the second insulation layer, and the inner wall of the third insulation layer is in contact with the outer wall of the circular tube.

[0007] Preferably, the tightening mechanism includes a slide plate slidably connected to several sliding grooves of the shell, a top block is fixed to the inner side of the adjacent slide plate, a clamping block is installed at the end of the top block away from the slide plate, and the inner wall of the arc-shaped groove of the clamping block is gap-matched with the outer wall of the top block, the rear end of the top block is fixed to the strain gauge substrate, and an elastic component is installed at the end of the slide plate away from the top block.

[0008] Preferably, the elastic component includes a vertical plate arranged on the outer side of the slide, and the outer wall of the vertical plate is fixedly connected to the shell, and a spring is connected between the vertical plate and the slide.

[0009] Preferably, a protective sleeve is fixedly connected to the right end of the circular tube, and a wiring terminal is installed inside the protective sleeve.

[0010] Preferably, the left end of the wiring terminal is connected to an electric wire, and the other end of the electric wire passes through the round tube and is connected to the strain element.

[0011] Preferably, the right end of the wiring terminal is connected to an output cable, and the middle outer wall of the output cable is fixedly connected to the inside of the protective sleeve.

[0012] Beneficial effects

[0013] The utility model provides a welded strain gauge, which has the following beneficial effects:

[0014] The shell can be driven to move so that the shell covers a section of the circular tube containing the strain element. Then the top block cooperates with the spring to tighten the block, thereby fixing the shell to the circular tube and the strain gauge substrate. In this way, when the strain gauge substrate is welded to the test piece by spot welding, since the first insulation layer, the second insulation layer and the third insulation layer are arranged inside the shell, the internal strain element can be protected and insulated by the three-layer insulation material in combination with the shell and the circular tube to avoid damage to it by welding sparks and high temperature generated during welding. After the strain gauge substrate welding work is completed, the shell can also be quickly removed, thereby achieving better use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the present utility model.

[0016] Figure 2 It is a planar sectional view of the present utility model.

[0017] Figure 3 It is a partially enlarged schematic diagram of the present invention.

[0018] Figure 4 For this utility model Figure 3 A local enlarged schematic diagram in .

[0019] Figure 5 For this utility model Figure 3 A local enlarged schematic diagram in .

[0020] In the figure: 1. Strain gauge substrate; 2. Round tube; 3. Strain element; 4. Housing; 5. First thermal insulation layer; 6. Second thermal insulation layer; 7. Third thermal insulation layer; 8. Protective sleeve; 9. Terminal block; 10. Wire; 11. Output cable; 12. Slide plate; 13. Top block; 14. Clamp block; 15. Vertical plate; 16. Spring. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] See also Figure 1-5 The utility model provides a technical solution: a welded strain gauge, comprising a strain gauge substrate 1 and a circular tube 2, wherein the front end surface of the strain gauge substrate 1 is welded with the circular tube 2, the interior of the circular tube 2 is sealed with a strain element 3 by curing glue, a shell 4 is installed on the outer wall of the left end of the circular tube 2, a protective mechanism is installed on the inner wall of the shell 4, and a tightening mechanism is installed on the outer wall of the shell 4;

[0023] The protective mechanism includes a first thermal insulation layer 5 bonded to the inner wall of the shell 4, a second thermal insulation layer 6 bonded to the inner wall of the first thermal insulation layer 5, a third thermal insulation layer 7 bonded to the inner wall of the second thermal insulation layer 6, and the inner wall of the third thermal insulation layer 7 is in contact with the outer wall of the circular tube 2;

[0024] The strain element 3 uses a temperature self-compensating strain gauge and is sealed in the circular tube 2 by curing with high-performance glue, which is convenient for use. The strain gauge substrate 1 and the circular tube 2 are made of weldable materials, so that this device constitutes a welded strain gauge. The first insulation layer 5 is made of aramid fiber, the second insulation layer 6 is made of glass fiber, and the third insulation layer 7 is made of foam fiber. In this way, the three layers of insulation material, combined with the shell 4 and the circular tube 2, can protect and insulate the internal strain element 3 to prevent it from being damaged by welding sparks and high temperatures generated during welding.

[0025] This embodiment is further configured such that the pressing mechanism includes a slide plate 12 slidably connected to a plurality of slide grooves of the housing 4, a top block 13 is fixedly connected to the inner side of the slide plate 12, a clamping block 14 is mounted on the end of the top block 13 away from the slide plate 12, and the inner wall of the arc-shaped groove of the clamping block 14 is gap-fitted with the outer wall of the top block 13, the rear end of the top block 13 is fixedly connected to the strain gauge substrate 1, and an elastic component is mounted on the end of the slide plate 12 away from the top block 13;

[0026] Four slide grooves are processed on the housing 4 so that the slide plate 12 can move in the slide grooves of the housing 4, and an arc groove is processed on the clamping block 14 so that the top block 13 can cooperate with the arc groove of the clamping block 14 to support it.

[0027] This embodiment is further configured such that the elastic component includes a vertical plate 15 arranged outside the slide 12 , and the outer wall of the vertical plate 15 is fixedly connected to the housing 4 , and a spring 16 is connected between the vertical plate 15 and the slide 12 .

[0028] This embodiment is further configured such that a protective sleeve 8 is fixedly connected to the right end of the circular tube 2 , and a wiring terminal 9 is installed inside the protective sleeve 8 .

[0029] This embodiment is further configured such that the left end of the connection terminal 9 is connected to a wire 10 , and the other end of the wire 10 passes through the round tube 2 and is connected to the strain element 3 .

[0030] This embodiment is further configured such that the right end of the wiring terminal 9 is connected to the output cable 11, and the middle outer wall of the output cable 11 is fixedly connected to the inner part of the protective sleeve 8;

[0031] The protective sleeve 8 can be a double-wall heat shrink sleeve.

[0032] It is worth noting that the models of the electrical structures involved in this application can be selected according to user needs and only need to meet the usage requirements of this application. At the same time, the corresponding control circuits are all existing technologies and can be fully implemented by people in this field, so I will not go into details.

[0033] By those skilled in the art, the components in this case are connected in sequence. The specific connection and operation sequence should refer to the following working principle. The detailed connection means are well-known technologies in this field. The following mainly introduces the working principle and process.

[0034] Embodiment: When it is necessary to use this device, the housing 4 can be driven to move so that the housing 4 covers a section of the tube 2 containing the strain element 3, and then the housing 4 is pressed toward the strain gauge substrate 1. When the top block 13 on the housing 4 contacts the clamping block 14, the top block 13 moves toward the end away from the clamping block 14 through the reaction force of the clamping block 14. At this time, the clamping block 14 drives the slide 12 to move in the slide groove of the housing 4. The slide 12 cooperates with the vertical plate 15 to squeeze the spring 16, causing the spring 16 to undergo elastic deformation. When the top block 13 enters the arc groove of the clamping block 14, the top block 13 cooperates with the spring 16 and the like to press the block 14 tightly, thereby fixing the shell 4 to the circular tube 2 and the strain gauge substrate 1. In this way, when the strain gauge substrate 1 is welded to the piece to be measured by spot welding, since the first thermal insulation layer 5, the second thermal insulation layer 6 and the third thermal insulation layer 7 are provided inside the shell 4, the internal strain element 3 can be protected and insulated by the three-layer thermal insulation material in combination with the shell 4 and the circular tube 2 to avoid damage to it caused by welding sparks and high temperature generated during welding. After the welding work of the strain gauge substrate 1 is completed, the shell 4 can also be quickly removed, thereby achieving better use effect.

[0035] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include," "comprise," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations. The phrase "includes an element defined by..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0036] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A welded strain gauge, comprising a strain gauge substrate (1) and a circular tube (2), wherein the front end surface of the strain gauge substrate (1) is welded to the circular tube (2), characterized in that: The interior of the circular tube (2) is sealed with a strain element (3) by curing glue, a shell (4) is installed on the outer wall of the left end of the circular tube (2), a protective mechanism is installed on the inner wall of the shell (4), and a tightening mechanism is installed on the outer wall of the shell (4); The protective mechanism comprises a first thermal insulation layer (5) bonded to the inner wall of the shell (4), a second thermal insulation layer (6) bonded to the inner wall of the first thermal insulation layer (5), a third thermal insulation layer (7) bonded to the inner wall of the second thermal insulation layer (6), and the inner wall of the third thermal insulation layer (7) is in contact with the outer wall of the circular tube (2).

2. A welded strain gauge according to claim 1, characterized in that: The tightening mechanism comprises a slide plate (12) slidably connected to a plurality of slide grooves of the housing (4), a top block (13) is fixedly connected to the inner side of the adjacent slide plate (12), a clamping block (14) is installed at one end of the top block (13) away from the slide plate (12), and the inner wall of the arc groove of the clamping block (14) is gap-matched with the outer wall of the top block (13), the rear end of the top block (13) is fixedly connected to the strain gauge substrate (1), and an elastic component is installed at one end of the slide plate (12) away from the top block (13).

3. A welded strain gauge according to claim 2, characterized in that: The elastic component comprises a vertical plate (15) arranged outside the slide plate (12), and the outer wall of the vertical plate (15) is fixedly connected to the shell (4), and a spring (16) is connected between the vertical plate (15) and the slide plate (12).

4. The welded strain gauge according to claim 1, characterized in that: A protective sleeve (8) is fixedly connected to the right end of the circular tube (2), and a wiring terminal (9) is installed inside the protective sleeve (8).

5. The welded strain gauge according to claim 4, characterized in that: The left end of the connection terminal (9) is connected to an electric wire (10), and the other end of the electric wire (10) passes through the circular tube (2) and is connected to the strain element (3).

6. The welded strain gauge according to claim 5, characterized in that: The right end of the wiring terminal (9) is connected to an output cable (11), and the middle outer wall of the output cable (11) is fixedly connected to the inside of the protective sleeve (8).

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