Temperature-controllable pressure sensor strain gauge patch clamp

Abstract

The application relates to a controllable temperature and pressure regulating strain gauge patch clamp of a pressure sensor, which comprises a fixed plate, a moving pressure plate, a pressure regulating device and a force measuring device; an S-shaped elastic body is arranged between the fixed plate and the moving pressure plate; strain gauges are pasted on the opposite sides of the S-shaped elastic body in two inner recesses through adhesive; the fixed plate and the moving pressure plate are respectively fixedly connected with fixed members, each strain gauge is respectively abutted on the fixed plate or the moving pressure plate through the fixed members; the fixed members are provided with a heating function and are connected with a temperature control device, which is used for fixing the strain gauges on the S-shaped elastic body and realizing automatic temperature control in the adhesive drying process; the force measuring device is arranged on one side of the S-shaped elastic body, and is used for detecting the pressure between the fixed plate and the moving pressure plate; the pressure regulating device is used for regulating the pressure between the fixed plate and the moving pressure plate. The application integrates the two steps of applying solidification pressure and temperature control in the strain gauge patch drying process, and has the advantages of automatic temperature control and precise pressure regulation.

Description

Technical Field

[0001] This invention relates to the field of resistance strain gauge technology, specifically to a temperature- and pressure-adjustable pressure sensor strain gauge patch fixture. Background Technology

[0002] S-shaped elastomers, due to their advantages such as small size, high overall stiffness, and good linear relationship between load and deformation, are suitable for densely arranged strain gauge pressure sensors. The quality and accuracy of strain gauge pressure sensors are closely related to the quality of the strain gauges' bonding to the elastomer.

[0003] Resistance strain gauges for sensors are typically mounted using various heat-curing adhesives. This requires applying specific curing pressure to the strain gauge using clamps and undergoing a complex curing process involving heating, holding, and cooling in an oven. Therefore, conventional adhesive pressure-heat curing techniques are cumbersome and labor-intensive. Furthermore, existing conventional single-point pressure clamps are ill-suited for the narrow bonding surface of S-shaped elastomers and cannot accurately adjust the clamping force to meet the specific curing pressures required by different strain gauge adhesives. Consequently, the quality of the strain gauge mounting cannot be guaranteed, affecting the overall product quality of the sensor. Summary of the Invention

[0004] To address the problems existing in the prior art, the purpose of this invention is to provide a temperature- and pressure-controlled pressure sensor strain gauge patch fixture that integrates the two steps of applying curing pressure and temperature control during strain gauge patch drying, thereby improving the quality of strain gauge patches.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A temperature- and pressure-adjustable pressure sensor strain gauge patch fixture includes a fixed plate, a movable pressure plate, a pressure regulating device, and a force measuring device;

[0007] An S-shaped elastomer is installed between the fixed plate and the movable pressure plate;

[0008] The S-shaped elastomer has two concave portions, and strain gauges are glued to both sides of the two concave portions by adhesive.

[0009] The fixed plate and the movable pressure plate are respectively fixedly connected to the fixing components, and each strain gauge abuts against the fixed plate or the movable pressure plate through the fixing components.

[0010] The fastener is equipped with a heating function and connected to a temperature control device, which is used to fix the strain gauge on the S-shaped elastomer and realize the automated temperature control of the adhesive drying process;

[0011] The force measuring device is located on one side of the S-shaped elastic body. The two ends of the force measuring device are connected to the fixed plate and the movable pressure plate, respectively, and are used to detect the pressure between the fixed plate and the movable pressure plate.

[0012] The pressure regulating device is connected to the fixed plate and the movable pressure plate respectively, and is used to regulate the pressure between the fixed plate and the movable pressure plate.

[0013] Furthermore, the fixing plate is provided with a positioning groove that matches the thickness of the S-shaped elastomer, and one side of the S-shaped elastomer is embedded in the positioning groove.

[0014] Furthermore, the fixing plate includes a fixing base plate and a positioning block. The positioning block is located between the fixing base plate and the S-shaped elastomer. The positioning block is fixed to the fixing base plate. The positioning block has a positioning groove that matches the thickness of the S-shaped elastomer. The upper part of one side of the S-shaped elastomer is embedded in the positioning groove.

[0015] Furthermore, the positioning groove is a U-shaped groove.

[0016] Furthermore, the fixing component is equipped with a coil heating device and covered with a high-temperature resistant silicone rubber sheet.

[0017] Furthermore, the fastener includes a short pressure block and a long pressure block, which are respectively disposed on both sides of the concave part of the S-shaped elastic body. The long pressure block abuts against the concave part of the S-shaped elastic body, and the short pressure block abuts against the other side of the concave part of the S-shaped elastic body. There are two sets of short pressure blocks and long pressure blocks, and the two sets of short pressure blocks and long pressure blocks are respectively arranged corresponding to the two concave parts.

[0018] Furthermore, the pressure regulating device includes a screw, a compression spring, and a nut. The screw passes through the fixed plate and the movable pressure plate. The compression spring is located on one side of the movable pressure plate and is sleeved on the screw. The nut is threadedly connected to the screw. The two ends of the compression spring abut against the movable pressure plate and the nut, respectively.

[0019] Furthermore, the nut is a ram's horn nut.

[0020] Furthermore, the force measuring device is a hydraulic force gauge.

[0021] In summary, the present invention has the following advantages:

[0022] Because the fixing component with heating function can directly heat and control the strain gauge adhesive, automated temperature control can be achieved during the strain gauge patch adhesive drying process. The pressure between the fixed plate and the moving pressure plate can be adjusted via a pressure regulating device to adjust the clamping force on the strain gauge on the S-shaped elastomer. The force measuring device detects and displays the clamping force for real-time adjustment, enabling precise control of the adhesive curing pressure. Therefore, this invention integrates the application of curing pressure and temperature control in strain gauge patch drying, offering the advantages of automatic temperature control and precise pressure adjustment. Attached Figure Description

[0023] Figure 1 This is a structural exploded view of the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of the clamp for mounting the S-shaped elastic body according to the present invention.

[0025] Figure 3 This is a schematic diagram of the assembly of the positioning block and the S-shaped elastic body.

[0026] Figure 4 for Figure 3 Schematic diagram of AA.

[0027] In the picture:

[0028] 1 is a fixed base plate, 2 is a positioning block, 21 is a positioning groove, 3 is a movable pressure plate, 4 is a screw, 5 is a short pressure block, 6 is a long pressure block, 7 is a compression spring, 8 is a ram's horn nut, 9 is a hydraulic force gauge, 10 is an S-shaped elastic body, and 11 is a strain gauge. Detailed Implementation

[0029] The present invention will now be described in further detail.

[0030] like Figure 1 As shown, a temperature- and pressure-adjustable pressure sensor strain gauge patch fixture includes a fixed plate, a movable pressure plate 3, a fixing component, a pressure regulating device, and a force measuring device.

[0031] The fixing plate includes a fixing base plate 1 and a positioning block 2.

[0032] The fixed base plate 1 has two rows of screw holes, and the movable pressure plate 3 has two corresponding rows of through round holes.

[0033] The pressure regulating device includes a screw 4, a compression spring 7 and a nut. The positioning block 2 is a block with corresponding through screw holes and positioning grooves 21, which is located between the fixed base plate 1 and the movable pressure plate 3, and is installed on the fixed base plate 1 by the screw 4.

[0034] The width of the positioning groove 21 of the positioning block 2 is matched with the thickness of the S-shaped elastomer 10, which is used to precisely limit the S-shaped elastomer 10 to improve the patch quality of the strain gauge 11.

[0035] Preferably, the positioning groove 21 is a U-shaped groove.

[0036] The fixing components include a short pressure block 5 and a long pressure block 6. Both the short pressure block 5 and the long pressure block 6 are equipped with coil heating devices and covered with high-temperature resistant silicone rubber sheets. There are two sets of short pressure blocks 5 and long pressure blocks 6. The two sets of short pressure blocks 5 and long pressure blocks 6 are installed on the fixed base plate 1 and the movable pressure plate 3 by screws. The fixed base plate 1 is equipped with one short pressure block 5 and one long pressure block 6 from top to bottom, and the movable pressure plate 3 is equipped with one long pressure block 6 and one short pressure block 5 from top to bottom.

[0037] The S-shaped elastomer 10 has two concave portions from top to bottom. Strain gauges 11 are attached to both sides of each concave portion by adhesive.

[0038] The movable pressure plate 3 is sleeved on the screw 4, so that the short pressure block 5 and the long pressure block 6 installed on it come into contact with the S-shaped elastic body 10 and the corresponding strain gauge 11.

[0039] like Figure 2-4 As shown, the upper left side of the S-shaped elastic body 10 with the strain gauge 11 attached is embedded in the positioning groove 21 of the positioning block 2, and the S-shaped elastic body 10 is fixed by the short pressure block 5 and the long pressure block 6. Among them, the upper right long pressure block 6 extends into and abuts against the upper concave part of the S-shaped elastic body 10, and the upper left short pressure block 5 is arranged on the other side of the upper concave part of the S-shaped elastic body 10, corresponding to the long pressure block 6, and the upper left short pressure block 5 is located below the positioning block 2; the lower left long pressure block 6 extends into and abuts against the lower concave part of the S-shaped elastic body 10, and the lower right short pressure block 5 is arranged on the other side of the lower concave part of the S-shaped elastic body 10, corresponding to the long pressure block 6.

[0040] Before curing, the adhesive for strain gauge 11 has a certain degree of fluidity, which can easily cause relative displacement between strain gauge 11 and S-shaped elastomer 10, leading to strain gauge 11 deviating from its ideal mounting position. Therefore, when applying curing pressure to strain gauge 11 on S-shaped elastomer 10, it is necessary to limit the movement of S-shaped elastomer 10. The positioning block 2 restricts the movement of sensor S-shaped elastomer 10 on short pressure block 5 and long pressure block 6 through a U-shaped groove that matches the thickness of S-shaped elastomer 10. It also fixes S-shaped elastomer 10 at multiple points and angles through short pressure block 5 and long pressure block 6. At this time, the fixed base plate 1, positioning block 2, short pressure block 5, and long pressure block 6 form a stable support for sensor S-shaped elastomer 10 after strain gauge 11 is mounted. When applying curing pressure to strain gauge 11 on S-shaped elastomer 10 by moving pressure plate 3, relative displacement between S-shaped elastomer 10 and strain gauge 11 can be avoided, thereby improving the mounting quality of strain gauge 11.

[0041] The force measuring device is preferably a hydraulic force gauge 9. One end of the hydraulic force gauge 9 is installed on the fixed base plate 1 by screws, and the other end is connected to the movable pressure plate 3. The movable pressure plate 3, which is equipped with short pressure block 5 and long pressure block 6, is sleeved on the screw rod 4, and the compression spring 7 and the ram's nut 8 are installed on the outside of the plate in sequence.

[0042] The movable pressure plate 3 contacts the hydraulic pressure gauge 9 (contact pads are provided according to actual conditions). The compression of the compression spring 7 is adjusted evenly and symmetrically by the spur nut 8. The pressure applied by the compression spring 7 to the movable pressure plate 3 is transmitted to the strain gauge 11 on the S-shaped elastic body 10 through the short pressure block 5 and the long pressure block 6, applying curing pressure to the strain gauge 11. At the same time, the pressure of the compression spring 7 on the movable pressure plate 3 is also transmitted to the hydraulic pressure gauge 9, and the curing pressure on the strain gauge 11 can be displayed by the reading on the hydraulic pressure gauge 9. The required curing pressure can be adjusted by applying the adhesive to the strain gauge 11 through the spur nut 8 according to the display reading of the hydraulic pressure gauge 9. The internal heating device of the short pressure block 5 and the long pressure block 6 is activated, and the heating and curing process is automatically controlled by the set heating program. During the process, the automatic heating system prompts for manual depressurization of the clamps to complete the entire heating and pressure curing process of the adhesive of the strain gauge 11.

[0043] The present invention has the following beneficial effects:

[0044] (1) Since the short pressure block 5 and long pressure block 6 of the built-in coil heating device can directly heat and control the adhesive of the strain gauge 11, the temperature control of the strain gauge 11 patch drying process can be automated; the compression amount of the compression spring 7 can be adjusted by the nut 8 to adjust the clamping force of the fixture, and the pressure can be directly displayed by the hydraulic pressure gauge 9, so as to achieve precise control of the adhesive curing pressure. Therefore, the above fixture integrates the two steps of applying curing pressure and temperature control in the strain gauge 11 patch drying process, and has the advantages of automatic temperature control and precise pressure adjustment.

[0045] (2) The fixture has a simple structure and adopts a modular design. While making it convenient to process, install and disassemble parts, the size of the pressure block can be adjusted or modified according to the specific size and form of the sensor. It is suitable for the production and processing of S-shaped or even other forms of pressure sensor strain gauge 11 patches of different sizes, and has great potential for upgrading and modification.

[0046] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A temperature- and pressure-adjustable pressure sensor strain gauge patch fixture, characterized in that: Includes a fixed plate, a movable pressure plate, a pressure regulating device, and a force measuring device; An S-shaped elastomer is installed between the fixed plate and the movable pressure plate; The S-shaped elastomer has two concave portions, and strain gauges are glued to both sides of the two concave portions of the S-shaped elastomer by adhesive. The fixed plate and the movable pressure plate are respectively fixedly connected to the fixing components, and each strain gauge abuts against the fixed plate or the movable pressure plate through the fixing components. The fastener is equipped with a heating function and connected to a temperature control device, which is used to fix the strain gauge on the S-shaped elastomer and realize the automated temperature control of the adhesive drying process; The force measuring device is located on one side of the S-shaped elastic body. The two ends of the force measuring device are connected to the fixed plate and the movable pressure plate, respectively, and are used to detect the pressure between the fixed plate and the movable pressure plate. The pressure regulating device is connected to the fixed plate and the movable pressure plate respectively, and is used to regulate the pressure between the fixed plate and the movable pressure plate; The fixing plate is provided with a positioning groove that matches the thickness of the S-shaped elastomer, and one side of the S-shaped elastomer is embedded in the positioning groove. The fasteners include short pressure blocks and long pressure blocks, which are respectively located on both sides of the concave part of the S-shaped elastic body. The long pressure block abuts against the concave part of the S-shaped elastic body, and the short pressure block abuts against the other side of the concave part of the S-shaped elastic body. There are two sets of short pressure blocks and long pressure blocks, and the two sets of short pressure blocks and long pressure blocks are respectively arranged corresponding to the two concave parts.

2. The temperature- and pressure-adjustable pressure sensor strain gauge patch fixture according to claim 1, characterized in that: The fixing plate includes a fixing base plate and a positioning block. The positioning block is located between the fixing base plate and the S-shaped elastomer. The positioning block is fixed to the fixing base plate. The positioning block has a positioning groove that matches the thickness of the S-shaped elastomer. The upper part of one side of the S-shaped elastomer is embedded in the positioning groove.

3. The temperature- and pressure-adjustable pressure sensor strain gauge patch fixture according to claim 1, characterized in that: The positioning groove is a U-shaped groove.

4. The temperature- and pressure-adjustable pressure sensor strain gauge patch fixture according to claim 1, characterized in that: The fixing component is equipped with a coil heating device and covered with a high-temperature resistant silicone rubber sheet.

5. A temperature- and pressure-adjustable pressure sensor strain gauge patch fixture according to claim 1, characterized in that: The pressure regulating device includes a screw, a compression spring, and a nut. The screw passes through the fixed plate and the movable pressure plate. The compression spring is located on one side of the movable pressure plate and is sleeved on the screw. The nut is threadedly connected to the screw. The two ends of the compression spring abut against the movable pressure plate and the nut, respectively.

6. A temperature- and pressure-adjustable pressure sensor strain gauge patch fixture according to claim 5, characterized in that: The nut is a ram's horn nut.

7. A temperature- and pressure-adjustable pressure sensor strain gauge patch fixture according to claim 1, characterized in that: The force measuring device is a hydraulic force gauge.

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