Pressing and fixing device for bonding installation of strain gauge

Abstract

The utility model discloses a pressing and fixing device for bonding installation of a strain gauge, which relates to the field of strain gauge installation and comprises a base capable of being fixed at the bonding position of the strain gauge, a pressing arm is detachably connected to the base, and a pressing block used for pressing the surface of the strain gauge is arranged at the front end of the pressing arm; a locking piece used for locking the pressing arm is arranged on the base, and when the pressing arm is locked by the locking piece, extrusion force exists between the pressing block and the strain gauge. According to the utility model, the structure is simple, the strain gauge can be extruded, an operator does not need to wait for a long time until glue is solidified, the influence of the size of an installation space, materials and surface flatness is avoided, and the strain gauge can be protected.

Description

Technical Field

[0001] The utility model relates to the field of strain gauge installation, in particular to a pressing and fixing device for bonding and installing a strain gauge. Background Art

[0002] The resistance strain gauge is a widely used electronic measuring instrument. Its main principle is to use the resistance strain gauge to convert mechanical strain into resistance change, and then measure the change in resistance through the strain indicator to reflect the change in mechanical strain. Resistance strain gauges are widely used in the engineering field, mainly used to measure the strain of materials or structural parts when they are subjected to stress. Specific application areas include but are not limited to: structural strain measurement; material performance testing; automotive engineering; civil engineering and geological strain measurement.

[0003] The purpose of using a strain gauge is to measure the strain at a certain point on a component in a specific direction. Before the component is subjected to force, the strain gauge can be attached to the measuring point using a special glue so that the length of the strain gauge is in the specified direction. Specifically, after the component is deformed by force, the strain gauge attached to the component will deform along with the material at the measuring point, causing the original resistance R of the strain gauge to change to R+ΔR (if it is tensile strain, the length of the resistance wire will increase, the cross-sectional area will decrease, and the resistance will increase).

[0004] For fixing the strain gauge, existing tools or devices usually use magnets, suction cups and bench vises, but these tools or devices are not suitable for specimens with non-steel structures, rough surfaces or non-thin walls, and narrow pasting spaces. Due to the limitations of materials and space, it is difficult to achieve universal application; secondly, the connection between the strain gauge and the wire is usually soldered, and the connection point is fragile. It is easy for the wire and the strain gauge to be pulled when the strain gauge is fixed and measured, resulting in the disconnection of the connection between the wire and the strain gauge, and the existing tools or devices do not provide sufficient protection for the strain gauge; finally, the strain gauge is usually installed and fixed on the measuring point surface of the component by glue bonding. Since it takes time for the glue to solidify, the operator usually presses the surface of the strain gauge for a long time until the glue solidifies before releasing it, which seriously affects efficiency.

[0005] In order to solve the above technical problems, a new pressing and fixing device is needed. Utility Model Content

[0006] The purpose of the utility model is to provide a pressing and fixing device for bonding and installing a strain gauge in response to the above-mentioned problems. The device has a simple structure and can maintain the compression of the strain gauge without requiring the operator to wait for a long time for the glue to solidify. The device is not affected by the size of the installation space, the material and the surface flatness, and can protect the strain gauge.

[0007] The technical solution adopted by the utility model is as follows: a pressing and fixing device for bonding and installing a strain gauge, comprising a base that can be fixed at the bonding position of the strain gauge, a pressing arm detachably connected to the base, a pressing block for pressing on the surface of the strain gauge is arranged at the front end of the pressing arm; a locking piece for locking the pressing arm is arranged on the base, and when the pressing arm is in a state of being locked by the locking piece, there is an extrusion force between the pressing block and the strain gauge.

[0008] Furthermore, an adhesive layer is provided at the bottom of the base, or the bottom surface of the base is an adhesive surface.

[0009] Furthermore, the rear end of the pressure arm is rotatably connected to the base via a hinge seat; or the rear end of the pressure arm is fixedly connected to the base.

[0010] Furthermore, the pressing block is fixedly connected to the pressing arm; or the pressing block is rotatably connected to the pressing arm, and the rotating surface of the pressing block is parallel to the rotating surface of the pressing arm.

[0011] Further, if the pressing block is rotatably connected to the pressing arm, the position where the pressing block is rotatably connected to the pressing arm is located above the center of gravity of the pressing block.

[0012] Furthermore, the locking member is a U-shaped slot, and the pressure arm can be stuck in the U-shaped slot; or the locking member is a locking plate, which is connected to the base through a rotating shaft, and there is a gap between the locking plate and the base surface that can accommodate the pressure arm; or the locking member is an elastic member, one end of the elastic member is fixedly connected to the pressure arm, and the other end of the elastic member is fixedly connected to the base.

[0013] Furthermore, the geometrical shape of the pressing arm is a rectangle, and the pressing block is connected to one side of the pressing arm.

[0014] Furthermore, a through hole for the wire connected to the strain gauge to pass through is provided on the base, the axial direction of the through hole is parallel to the rotation surface of the pressure arm, and the wire connected to the strain gauge can be fixedly connected to the through hole.

[0015] Furthermore, the bottom of the pressing block has a notch.

[0016] Furthermore, positioning marks are arranged around the base.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0018] 1. The base in the utility model can be fixed on a component close to the installation of the strain gauge by bonding, so that the fixing of the strain gauge is not restricted by the site, component material and component surface roughness, and has high adaptability;

[0019] 2. The pressure arm in the utility model acts on the pressure block, which can press the strain gauge onto the component, and the pressure arm is locked by the locking piece, so that the pressure block keeps the strain gauge under pressure, effectively avoiding the strain gauge from being offset, dislocated and falling off before the glue is cured, and ensuring the reliability of the strain gauge being fixed on the component by glue;

[0020] 3. In the utility model, since there is a locking piece to lock the pressure arm, the strain gauge is kept in a compressed state, and the operator does not need to use tools to press the surface of the strain gauge for a long time until the glue solidifies. That is, after completing the tooling for installing the strain gauge, the operator can immediately switch to the tooling operation for installing the next strain gauge, thereby improving the efficiency of installing all strain gauges;

[0021] 4. In the utility model, since the pressure arm and the base are detachably connected, after the strain gauge is bonded and fixed, the pressure arm can be removed and the base can be retained. The base fixes the wire connected to the strain gauge, thereby protecting the strain gauge and preventing the connection between the wire and the strain gauge from being disconnected due to pulling the wire during the use of the component. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be described by way of examples with reference to the accompanying drawings, in which:

[0023] Figure 1 This is a schematic diagram of the state when the pressure block in the utility model is pressed on the strain gauge;

[0024] Figure 2 This is a schematic diagram of the state when the pressure block in the utility model is not pressed on the strain gauge;

[0025] Figure 3 This is a schematic diagram of the utility model disclosing a pressing arm and a base being fixedly connected;

[0026] Figure 4 The locking member disclosed in the utility model is a structural schematic diagram of a locking plate;

[0027] Figure 5 This is a schematic diagram of the structure in which the locking member disclosed in the utility model is an elastic member;

[0028] Markings in the figure: 1-base; 11-through hole; 2-locking piece; 21-locking plate; 22-rotating shaft; 23-elastic piece; 3-hinge seat; 4-pressing arm; 5-adhesive layer; 6-pressing block; 61-notch. DETAILED DESCRIPTION

[0029] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0030] Any feature disclosed in this specification, unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0031] Example 1

[0032] like Figure 1-Figure 5 As shown, a pressing and fixing device for bonding and installing a strain gauge comprises a base 1 that can be fixed at the bonding position of the strain gauge. The fixing method of the base 1 is preferably bonding, which will not be affected by the site, component material and surface roughness, thereby ensuring that the base 1 is effectively fixed; a pressing arm 4 is detachably connected to the base 1; a pressing block 6 is arranged at the front end of the pressing arm 4. When the strain gauge is installed, the pressing block 6 is pressed against the strain gauge so that the strain gauge is stably located on the component, waiting for the glue between the strain gauge and the surface of the component to solidify; a locking member 2 is arranged on the base 1, and the locking member 2 can lock the pressing arm 4 to maintain the extrusion force between the pressing block 6 and the strain gauge, that is, to keep the pressing block 6 in a state of extruding the strain gauge, effectively avoiding the occurrence of displacement, dislocation and falling off of the strain gauge before the glue is solidified, thereby ensuring the reliability of the strain gauge being fixed to the component by glue.

[0033] In the present embodiment, since there is a locking member 2 that locks the pressing arm 4 so that the strain gauge remains in a compressed state, there is no need for the operator to use a tool to squeeze the surface of the strain gauge for a long time until the glue solidifies, that is, after completing the tooling for installing the strain gauge, the operator can immediately switch to the tooling operation for installing the next strain gauge, thereby improving the efficiency of installing all strain gauges; for example, it takes 20 seconds for the glue to solidify, and the existing system requires the operator to squeeze the surface of the strain gauge for at least 20 seconds to ensure that the glue solidifies and achieves stable installation of the strain gauge; using the pressing and fixing device disclosed in the present embodiment, since the locking member 2 can lock the pressing arm 4 so that the strain gauge remains in a state of being squeezed by the pressing block 6, there is no need for the operator to personally squeeze the surface of the strain gauge for at least 20 seconds, and the operator can install other strain gauges within this 20-second period. Although the time consumed for installing a single strain gauge is not shortened, for the installation of multiple strain gauges, the time required to complete the installation of all strain gauges is shortened, thereby effectively improving efficiency.

[0034] In this embodiment, since the pressure arm and the base are detachably connected, after the strain gauge is bonded and fixed, the pressure arm can be removed and the base can be retained. The base fixes the wire connected to the strain gauge, thereby protecting the strain gauge and preventing the connection between the wire and the strain gauge from being disconnected due to pulling the wire during the use of the component.

[0035] Example 2

[0036] On the basis of Example 1, a feasible implementation method of “fixing a base on a component” is further proposed.

[0037] In the first embodiment, an adhesive layer 5 is provided at the bottom of the base 1, and the adhesive layer 5 is preferably made of double-sided tape, which can enable the base 1 to be bonded to the component near the installation position of the strain gauge; using double-sided tape as the adhesive layer 5 can achieve stable installation and fixation while simplifying the installation and fixation operation of the base 1; the base 1 can be fixed on the component near the installation of the strain gauge by bonding, so that the installation of the strain gauge is not restricted by the site and has high adaptability.

[0038] In a second implementation mode, the bottom surface of the base 1 is used as a bonding surface, glue can be applied on the bonding surface, and the base is fixed to the bonding position of the strain gauge on the component by glue.

[0039] Example 3

[0040] On the basis of any one of the implementations in Examples 1-2, a specific implementation of “the connection feature between the pressure arm and the base” is further proposed.

[0041] In the first embodiment, the rear end of the pressure arm 4 is rotatably connected to the base 1 through the hinge seat 3, and the pressure arm 4 can rotate around the hinge seat 3 on the base 1 in the front and rear directions; when the strain gauge needs to be pressed, the pressure arm is rotated forward so that the pressure block 6 squeezes the strain gauge, and the pressure arm 4 is locked by the locking piece 2, so that the pressure arm 4 and the pressure block 6 keep pressing the strain gauge; after the glue bonding the strain gauge is cured, the pressure arm 4 is rotated backward so that the pressure block 6 is separated from the strain gauge.

[0042] In the first embodiment, the specific structure of the hinge seat 3 is known to those skilled in the art, such as a hinge, and will not be described in detail here. It should be noted that the hinge seat 3 and the base 1 can be detachably connected by screws to realize the detachable connection between the hinge seat 3 and the base 1, thereby realizing the detachable connection between the pressure arm 4 and the base 1.

[0043] In the second embodiment, the rear end of the pressure arm 4 is fixedly connected to the base 1, and the locking piece 2 can be the fixing point for the pressure arm to be fixedly connected to the base; when the strain gauge needs to be pressed, the operator can lift the front section of the pressure arm 4, and the pressure arm 4 undergoes elastic bending deformation, and there is a gap between the pressure block 6 and the surface of the component for placing the strain gauge; after the strain gauge is placed in the gap, the pressure arm 4 is lowered, and the pressure arm 4 causes the pressure block 6 to press the strain gauge; after the glue bonding the strain gauge is cured, the pressure arm 4 can be directly disassembled to achieve the separation of the pressure block 6 from the strain gauge.

[0044] In the second embodiment, the pressure arm 4 and the base 1 can be detachably fixedly connected by screws.

[0045] In this embodiment, after the pressing arm 4 is locked by the locking member, how to maintain the pressing force between the pressing block 6 and the strain gauge is described as follows.

[0046] When the pressure arm 4 is locked by the locking member 2, the vertical distance between the locking member 2 and the surface where the strain gauge is installed is less than the vertical distance between the position where the pressure arm 4 is connected to the pressure block 6 and the surface where the strain gauge is installed; if the base 1 is placed on a horizontal plane, the horizontal plane is used as the surface where the strain gauge is installed, and the height of the locking member 2 is less than the height of the position where the pressure block 6 is connected to the pressure arm 4, that is, after the locking member 2 locks the pressure arm 4, the pressure arm 4 has a weak bending elastic deformation (the deformation is within the elastic deformation value of the pressure arm 4 material), so that the pressure arm 4 has elastic potential energy and the elastic potential energy acts on the strain gauge through the pressure block 6; or the pressure block 6 is squeezed to produce an elastic deformation with a reduced height (the deformation is within the elastic deformation value of the pressure block 6 material), so that the strain gauge is continuously subjected to the elastic force of the pressure block 6. Thus, the strain gauge remains in a compressed state, effectively avoiding the occurrence of displacement, dislocation and falling off of the strain gauge before the glue is cured, and ensuring the reliability of the strain gauge fixed to the component by glue.

[0047] Example 4

[0048] On the basis of any one of the implementations in Examples 1-3, an implementation of “the connection features between the pressing block and the pressing arm” is further proposed.

[0049] In a first embodiment, when a specific strain gauge is installed on a specific component, the pressing block 6 is fixedly connected to the pressing arm 4 .

[0050] In the second embodiment, the pressing block 6 is rotatably connected to the pressing arm 4, and the rotation plane of the pressing block 6 is parallel to the rotation plane of the pressing arm 4, that is, the angle of the pressing block 6 relative to the pressing arm 4 can be adjusted, so that the pressing block 6 can squeeze the strain gauge in a direction perpendicular to the surface of the strain gauge, adapting to various installation angles of the strain gauge while ensuring that the extrusion force on the strain gauge has no tangential component (that is, the component parallel to the strain gauge), thereby further reducing the misalignment of the strain gauge and further ensuring the stability of the installation position of the strain gauge.

[0051] On the basis of the second embodiment, a feasible embodiment is further proposed, in which the position where the pressing block 6 is rotatably connected to the pressing arm 4 is located above the center of gravity of the pressing block 6. Because the strain gauge is usually installed horizontally, this design enables the pressing block 6 to maintain a vertical state under the action of its own gravity, that is, there is no need for the operator to deliberately adjust the angle of the pressing block 6 relative to the pressing arm 4, and the pressing block 6 can adaptively squeeze the strain gauge in a direction perpendicular to the surface of the strain gauge.

[0052] Example 5

[0053] On the basis of any one of the implementations in Examples 1-4, a specific implementation of the "locking member 2" is further proposed.

[0054] It can be seen from the description in Example 1 that the main purpose of the locking member 2 is to lock the pressing arm 4. To this end, the following embodiments of the locking member 2 are proposed.

[0055] The first implementation method, such as Figure 3 As shown, the locking member 2 is the connection point where the pressure arm 4 is fixedly connected to the base 1 . This embodiment is directed to the second embodiment in Example 3, that is, the rear end of the pressure arm 4 is fixedly connected to the base 1 .

[0056] In view of the rotational connection between the pressure arm 4 and the base 1, the second, third and fourth embodiments of the locking member 2 are proposed.

[0057] The second implementation method, such as Figure 1-Figure 2 As shown, the locking member 2 is a U-shaped slot, the slot size of which is smaller than the size of the pressure arm 4, so as to achieve the purpose of constraining the pressure arm 4 to remain in the U-shaped slot; the pressure arm 4 can be stuck in the U-shaped slot, thereby achieving the locking member 2 locking the pressure arm 4.

[0058] The third implementation method, such as Figure 4 As shown, the locking member 2 is a locking plate 21, which is connected to the base 1 through a rotating shaft 22, and there is a gap between the locking plate 21 and the surface of the base 1 that can accommodate the pressure arm 4; first, the locking plate 21 is rotated to another direction or 180° so that it will not block the rotation of the pressure arm 4. When the pressure arm 4 is rotated to the point where the pressure block 6 presses on the strain gauge, the pressure arm 4 is in the space where the gap is located, and then the locking plate 21 is rotated back again so that the locking plate 21 is located on the pressure arm 4, thereby achieving the locking of the pressure arm 4 by the locking member 2.

[0059] The fourth implementation method is as follows: Figure 5 As shown, the locking member 2 is an elastic member 23, one end of the elastic member 23 is fixedly connected to the pressure arm 4, and the other end of the elastic member 23 is fixedly connected to the base 1; the elastic member 23 is preferably a tension spring, which always has elastic deformation so that the pressure arm is subjected to a force to rotate forward.

[0060] In the second and third embodiments, the force that keeps the strain gauge under stable pressure from the pressure block 6 may come from the elastic deformation of the pressure arm 4 or the elastic deformation of the pressure block 6; and in the fourth embodiment, the force that keeps the strain gauge under stable pressure from the pressure block 6 may come from the elastic force of the elastic member 23.

[0061] Example 5

[0062] Based on any one of the implementation methods in Examples 1-3, a specific implementation method that can be implemented is further proposed.

[0063] A feasible implementation method is that the geometric shape of the pressure arm 4 is a rectangle, and the pressure block 6 is connected to one side of the pressure arm 4, which has two sets of parallel sides, namely long sides and short sides, one short side is hinged to the base 1, and the other short side is connected to the pressure block 6; the two long sides can be locked by the corresponding locking members 2 respectively; the pressure arm 4 is set as a rectangular arm, and the position of the pressure block 6 can be limited by the two long sides, effectively preventing the pressure block 6 from detaching from the pressure arm 4 when squeezing the strain gauge.

[0064] A feasible implementation manner is that a through hole 11 is provided on the base 1 for the wire connected to the strain gauge to pass through, the axial direction of the through hole 11 is parallel to the rotation surface of the pressure arm 4, and the wire connected to the strain gauge can be fixedly connected to the through hole 11. By fixing the wire, the force point is at the fixed position of the wire. If the wire is pulled, since the wire is fixed, the pulling force will not be transmitted to the connection position between the wire and the strain gauge, thereby not damaging the connection between the wire and the strain gauge, thereby effectively achieving the purpose of protection.

[0065] In this embodiment, the fixing of the wire can be implemented in the following ways.

[0066] In a first implementation mode, the wire is fixed in the through hole 11 by glue.

[0067] In a second embodiment, fixing members are provided at both ends of the through hole 11 to fix the wire; the fixing members may be snap buckles.

[0068] In a feasible implementation manner, the bottom of the pressing block 6 has a notch 61, and the notch 61 leaves space for operators to place the strain gauge.

[0069] In a feasible implementation manner, positioning marks are arranged around the base 1 to cooperate with the positioning marks on the surface of the component to achieve positioning of the base 1.

[0070] It should be noted that, in combination with the through hole 11 and the positioning mark, the installation direction of the strain gauge can be conveniently and quickly determined, that is, the installation direction of the strain gauge is along the axial direction of the through hole 11 .

[0071] The present invention is not limited to the above-mentioned specific implementation modes, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A pressing and fixing device for bonding and installing a strain gauge, characterized in that: The invention comprises a base (1) which can be fixed at a bonding position of a strain gauge, a pressure arm (4) being detachably connected to the base (1), a pressure block (6) being provided at the front end of the pressure arm (4) for pressing on the surface of the strain gauge; a locking piece (2) for locking the pressure arm (4) is provided on the base (1), and when the pressure arm (4) is in a state of being locked by the locking piece (2), there is a squeezing force between the pressure block (6) and the strain gauge.

2. The pressing and fixing device according to claim 1, characterized in that: The bottom of the base (1) is provided with an adhesive layer (5), or the bottom surface of the base (1) is an adhesive surface.

3. The pressing and fixing device according to claim 1, characterized in that: The rear end of the pressure arm (4) is rotatably connected to the base (1) via a hinge seat (3); or the rear end of the pressure arm (4) is fixedly connected to the base (1).

4. The pressing and fixing device according to claim 3, characterized in that: The pressing block (6) is fixedly connected to the pressing arm; or the pressing block (6) is rotatably connected to the pressing arm (4), and the rotating surface of the pressing block (6) is parallel to the rotating surface of the pressing arm (4).

5. The pressing and fixing device according to claim 4, characterized in that: If the pressing block (6) is rotatably connected to the pressing arm (4), the position where the pressing block (6) and the pressing arm (4) are rotatably connected is located above the center of gravity of the pressing block (6).

6. The pressing and fixing device according to claim 3, characterized in that: The locking member (2) is a connection point where the pressure arm (4) is fixedly connected to the base (1); or the locking member (2) is a U-shaped slot, in which the pressure arm (4) can be clamped; or the locking member (2) is a locking plate (21), which is connected to the base (1) via a rotating shaft (22), and there is a gap between the locking plate (21) and the surface of the base (1) that can accommodate the pressure arm (4); or the locking member (2) is an elastic member (23), one end of the elastic member (23) is fixedly connected to the pressure arm (4), and the other end of the elastic member (23) is fixedly connected to the base (1).

7. The pressing and fixing device according to any one of claims 1 to 6, characterized in that: The geometric shape of the pressing arm (4) is a rectangle, and the pressing block (6) is connected to one side of the pressing arm (4).

8. The pressing and fixing device according to any one of claims 1 to 6, characterized in that: The base (1) is provided with a through hole (11) for a wire connected to the strain gauge to pass through, the axial direction of the through hole (11) is parallel to the rotation surface of the pressure arm (4), and the wire connected to the strain gauge can be fixedly connected to the through hole (11).

9. The pressing and fixing device according to any one of claims 1 to 6, characterized in that: The bottom of the pressing block (6) has a notch (61).

10. The pressing and fixing device according to any one of claims 1 to 6, characterized in that: Positioning marks are arranged around the base (1).

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