A tool for press-mounting strain gauges and a method of press-mounting strain gauges

Abstract

The application relates to the technical field of tooling, and discloses a tooling for press-fitting a strain gauge and a strain gauge press-fitting method, which comprises an upper press piece and a lower press piece. The upper press piece is provided with a first notch used for being attached to the upper side of a square strain beam of a sensor, and the lower press piece is provided with a second notch used for being attached to the lower side of the square strain beam of the sensor, so as to press the strain gauge to the upper side and the lower side of the square strain beam of the sensor. An upper fixed plate and a lower fixed plate are connected through a connecting assembly, and the upper press piece and the lower press piece are arranged between the upper fixed plate and the lower fixed plate. An elastic piece is arranged between the upper press piece and the upper fixed plate and is used for providing a press-fitting pressure. A limiting assembly is arranged on the connecting assembly and is used for limiting the clamping distance between the upper press piece and the upper fixed plate, so as to limit the compression amount of the elastic piece and adjust the press-fitting pressure. A quick locking assembly has a locking position and an unlocking position, and is used for locking the upper fixed plate and the lower fixed plate in the locking position and unlocking the upper fixed plate and the lower fixed plate in the unlocking position.

Description

Technical Field

[0001] This invention relates to the field of tooling technology for press-fitting strain gauges, and in particular to a tooling for press-fitting strain gauges and a method for press-fitting strain gauges. Background Technology

[0002] In the field of sensor manufacturing, the installation quality of strain gauges on square strain beams directly affects the accuracy and stability of sensors.

[0003] Currently, strain gauge installation mostly relies on manual pressing or simple clamps, depending on the worker's feel, making it difficult to ensure the consistency and controllability of the pressing pressure. Especially for the simultaneous installation of both sides of a square beam, traditional tools lack a symmetrical pressure structure, often resulting in uneven stress on the upper and lower strain gauges. In addition, rigid clamping is prone to impact slippage. Furthermore, existing clamping methods are time-consuming to install and remove, failing to meet the efficiency requirements of mass production.

[0004] Therefore, how to ensure precise, controllable, and uniform pressing pressure when installing the sensor square beam on both sides simultaneously, and how to achieve rapid loading and unloading, are all directions that urgently need optimization. Summary of the Invention

[0005] Therefore, it is necessary to provide a tooling and strain gauge pressing method for pressing strain gauges, aiming to solve at least one of the above-mentioned problems.

[0006] The first aspect of this application provides a tooling for press-fitting strain gauges, comprising: The upper pressure plate and the lower pressure plate are provided. The upper pressure plate is provided with a first notch for fitting with the upper side of the square strain beam of the sensor, and the lower pressure plate is provided with a second notch for fitting with the lower side of the square strain beam of the sensor, so as to press the strain gauge tightly against the upper and lower sides of the square strain beam of the sensor. The system includes an upper fixing plate, a lower fixing plate, and a connecting assembly. The upper fixing plate and the lower fixing plate are connected by the connecting assembly, and the upper pressure plate and the lower pressure plate are disposed between the upper fixing plate and the lower fixing plate. An elastic element is disposed between the upper pressure plate and the upper fixed plate to provide pressing pressure; A limiting component, disposed in the connecting component, is used to limit the clamping distance between the upper pressure plate and the upper fixed plate, so as to limit the compression of the elastic element and adjust the pressing pressure; A quick-lock assembly has a locking position and an unlocking position, used to lock the upper fixing plate and the lower fixing plate in the locking position and to unlock the upper fixing plate and the lower fixing plate in the unlocking position.

[0007] In some embodiments, the tooling for pressing the strain gauge further includes: A spacer is used to be placed between two adjacent sensors when multiple sensors are pressed together simultaneously. The spacer has a first side and a second side. The first side is provided with a first pressing part for fitting with the side of the square strain beam corresponding to one sensor. The second side is provided with a second pressing part for fitting with the side of the square strain beam corresponding to another adjacent sensor, so as to press the corresponding strain gauges onto the sides of the square strain beams corresponding to the two adjacent sensors respectively.

[0008] In some embodiments, the spacer is an integral structure; and / or, the spacer is made of PTFE.

[0009] In some embodiments, the upper pressure plate and the lower pressure plate are made of PTFE; and / or, the elastic element is a wave spring; and / or, the elastic element is made of 17-7PH stainless steel; and / or, the edges of the first recess and the second recess are chamfered.

[0010] In some embodiments, one of the lower fixing plate and the lower pressure plate is provided with a positioning boss, and the other is provided with a positioning groove, the positioning boss extending at least partially into the positioning groove to limit the horizontal displacement of the lower pressure plate; and / or, the tooling for mounting the strain gauge for pressing the strain gauge further includes at least one lateral limiting member connected to the connecting assembly, the lateral limiting member being configured to limit abutment against one side of the sensor between the upper pressure plate and the lower pressure plate.

[0011] In some embodiments, the connecting assembly includes at least two connecting rods, one end of which passes through the upper fixing plate and the other end of which is connected to the lower fixing plate, with each connecting rod extending in a parallel direction to the upper and lower pressure plates.

[0012] In some embodiments, the limiting assembly includes a limiting nut threadedly connected to the connecting rod, the distance between the limiting nut and the upper fixing plate being adjustable, and the limiting nut being configured to abut against the side of the upper fixing plate facing the lower fixing plate when the upper fixing plate and the lower fixing plate are locked together; the connecting rod is a fully threaded screw.

[0013] In some embodiments, the quick-lock assembly includes: The bayonet is located on the upper fixing plate; A locking rod is rotatably disposed on the connecting assembly. The locking rod is movable to a locked position and an unlocked position. In the locked position, the locking rod passes through the bayonet portion, and in the unlocked position, the locking rod moves out of the bayonet portion. A locking nut is threaded onto the locking rod when the locking rod is in the locked position to lock the upper fixing plate and the lower fixing plate.

[0014] A second aspect of this application provides a strain gauge pressing method, which employs the tooling for pressing strain gauges described in any of the above embodiments, the strain gauge pressing method comprising: Strain gauges are attached to the upper and lower sides of the square strain beam of the sensor; The lower pressure plate is installed on the lower fixing plate, and the lower pressure plate is engaged with the lower part of the square strain beam through the second notch, so as to clamp the strain gauge on the lower side of the square strain beam of the sensor in the second notch; The upper pressure plate is engaged with the upper part of the square strain beam through the first notch, so as to clamp the strain gauge on the upper side of the square strain beam of the sensor in the first notch. Place the elastic element above the upper pressure plate, and place the upper fixing plate above the elastic element; The limiting component is pre-adjusted to the calculated position on the connecting component so as to adjust the compression of the elastic element through the limiting component and set the target pressing pressure; The upper fixing plate is pressed so that it abuts against the limiting component, and the upper fixing plate and the lower fixing plate are locked together by the quick-locking component for pressing and installing the strain gauge.

[0015] In some embodiments, the strain gauge pressing method further includes: The tooling for pressing the strain gauges, along with the sensor, is placed together in a baking equipment for curing after pressing. After cooling, unlock the quick-lock assembly and remove the sensor.

[0016] The beneficial effects of this invention are: The tooling and strain gauge pressing method of the present invention achieves simultaneous pressing on both sides by setting an upper pressure plate and a lower pressure plate to respectively adhere to the upper and lower sides of a square strain beam, ensuring uniform stress on the strain gauge. The shapes of the first and second recesses are adapted to the contour of the square strain beam, enabling rapid engagement and precise positioning of the upper and lower pressure plates with the square strain beam, ensuring that the contact surfaces of the first and second recesses are always aligned with the area where the strain gauge is located during pressing. During simultaneous pressing on both sides, the first and second recesses on both sides are pressed simultaneously, which is beneficial to uniform stress on the strain gauge. The elastic element, together with the limiting component, can precisely control the compression amount, thereby adjusting the pressing pressure and avoiding excessive or insufficient pressure. The quick-lock component enables the tooling to be quickly locked and unlocked, greatly improving loading and unloading efficiency and adapting to the needs of mass production. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one embodiment of the present invention. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a 3D schematic diagram of an existing sensor; Figure 2 A three-dimensional schematic diagram of a tooling assembly for press-fitting strain gauges provided for an embodiment of the present invention; Figure 3 A three-dimensional disassembly diagram of a tooling for press-fitting strain gauges provided for an embodiment of the present invention; Figure 4 A three-dimensional schematic diagram of a tooling for press-fitting strain gauges provided for an embodiment of the present invention; Figure 5 An assembly perspective view of another tooling for press-fitting strain gauges provided for an embodiment of the present invention; Figure 6 A perspective view of a spacer for a tooling for press-fitting strain gauges, provided for an embodiment of the present invention; Figure 7 A three-dimensional schematic diagram of a tooling for pressing strain gauges and simultaneously pressing three sets of sensors, provided for an embodiment of the present invention; Figure 8 This is a three-dimensional schematic diagram of another tooling for pressing strain gauges, provided for an embodiment of the present invention, which simultaneously presses six sets of sensors.

[0019] Figure label: 100. Sensor; 110. Square strain beam; 1. Upper pressing plate; 11. First notch; 2. Lower pressing plate; 21. Second notch; 3. Install the upper fixing plate; 4. Lower fixing plate; 41. Positioning boss; 5. Connecting components; 51. Connecting rod; 6. Elastic components; 7. Limiting assembly; 71. Limiting nut; 8. Quick-lock assembly; 81. Bayonet; 82. Locking rod; 83. Locking nut; 84. Adapter plate; 85. Positioning nut; 9. Spacer; 91. First pressing part; 92. Second pressing part; 10. Side limiting component. Detailed Implementation

[0020] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, a feature "above" or "below" the second feature may mean that the feature is in direct contact with the second feature or indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature may mean that the feature is directly above or diagonally above the second feature, or simply indicates that the feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "beneath" of the second feature may mean that the feature is directly below or diagonally below the second feature, or simply indicates that the feature is at a lower horizontal level than the second feature.

[0025] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0026] Figure 1 This is a three-dimensional schematic diagram of an existing sensor, showing four square strain beams 110. The diagram shows one side of the square strain beam 110 where strain gauges need to be pressed in, with the other side on the back. Regarding the pressing process of strain gauges for this type of sensor, embodiments of this application provide tooling for pressing strain gauges and a method for pressing strain gauges.

[0027] refer to Figures 2-8The embodiments of this application provide a tooling for press-fitting strain gauges, which includes an upper pressure plate 1 and a lower pressure plate 2, an upper fixing plate 3, a lower fixing plate 4 and a connecting assembly 5, an elastic element 6, a limiting assembly 7, and a quick-lock assembly 8. The upper pressure plate 1 is provided with a first notch 11 for fitting against the upper side of the square strain beam 110 of the sensor 100, and the lower pressure plate 2 is provided with a second notch 21 for fitting against the lower side of the square strain beam 110 of the sensor 100, so as to press the strain gauge against the upper and lower sides of the square strain beam 110 of the sensor 100; the upper fixing plate 3 and the lower fixing plate 4 are connected by a connecting assembly 5, and the upper pressure plate 1 and the lower pressure plate 2 are disposed between the upper fixing plate 3 and the lower fixing plate 4; the elastic element 6 is disposed between the upper pressure plate 1 and the upper fixing plate 3, and is used to provide pressing pressure; the limiting assembly 7 is disposed on the connecting assembly 5, and is used to limit the clamping distance between the upper pressure plate 1 and the upper fixing plate 3, so as to limit the compression of the elastic element 6 and adjust the pressing pressure; the quick-lock assembly 8 has a locking position and an unlocking position, and is used to lock the upper fixing plate 3 and the lower fixing plate 4 in the locking position and unlock the upper fixing plate 3 and the lower fixing plate 4 in the unlocking position. By setting the upper pressure plate 1 and the lower pressure plate 2 to fit the upper and lower sides of the square strain beam 110 respectively, the double-sided synchronous pressing is achieved, which is conducive to the uniform force on each strain gauge. Furthermore, the shape of the first notch 11 and the second notch 21 is adapted to the contour of the square strain beam 110, so as to achieve quick engagement and precise positioning of the upper pressure plate 1 and the lower pressure plate 2 with the square strain beam 110, ensuring that the mating surfaces of the first notch 11 and the second notch 21 are always aligned with the area where the strain gauge is located during pressing. Moreover, the first notch 11 and the second notch 21 on both sides are pressed simultaneously during double-sided synchronous pressing, which is conducive to the uniform force on the strain gauge. The elastic element 6, together with the limiting component 7, can precisely control the compression amount, thereby adjusting the pressing pressure and avoiding excessive or insufficient pressure. The quick-lock component 8 realizes the quick locking and unlocking of the tooling, which greatly improves the loading and unloading efficiency and adapts to the needs of mass production.

[0028] In some implementations, reference Figures 2-8The tooling for pressing strain gauges also includes a spacer 9. The spacer 9 is placed between two adjacent sensors 100 when multiple sets of sensors 100 are pressed simultaneously. The spacer 9 has a first side and a second side. The first side is provided with a first pressing part 91 for abutting against the side of the square strain beam 110 corresponding to one sensor 100, and the second side is provided with a second pressing part 92 for abutting against the side of the square strain beam 110 corresponding to another adjacent sensor 100, so as to press the corresponding strain gauges onto the sides of the square strain beam 110 corresponding to the two adjacent sensors 100 respectively. When multiple sets of sensors 100 are pressed simultaneously, there is a lack of effective spacing and pressure transmission structure. By setting the spacer 9, with the first pressing part 91 and the second pressing part 92 on both sides of the spacer 9, the strain gauges on the corresponding sides of two adjacent sensors 100 can be pressed simultaneously, realizing independent pressure transmission and precise positioning when multiple sets of sensors 100 are stacked and pressed synchronously, avoiding mutual interference and ensuring consistent pressing quality for each set. Furthermore, the first pressing part 91 and the second pressing part 92 may also have a notch structure with the same shape as the first notch 11 and the second notch 21, so as to better adapt to the shape of the square strain beam 110 of the sensor 100.

[0029] In some implementations, reference Figures 2-8 The spacer 9 is an integrated structure, which is simple and low in cost.

[0030] refer to Figures 2-8 In some embodiments, the spacer 9 is made of PTFE. PTFE has excellent high temperature resistance, self-lubrication and lightweight properties, which prevents it from sticking to the strain gauge, ensures stable pressing quality, and is suitable for multiple synchronous pressing scenarios.

[0031] In some implementations, reference Figures 2-8 The upper pressure plate 1 and the lower pressure plate 2 are made of PTFE. If the materials of the upper pressure plate 1 and the lower pressure plate 2 are not properly selected, it may cause deformation, adhesion of strain gauges or scratching of square strain beam 110 at high temperature. PTFE material is high temperature resistant, self-lubricating and lightweight, so as to avoid damage to the strain gauges.

[0032] refer to Figures 2-8 In some embodiments, the elastic element 6 is a wave spring. Wave springs possess the characteristic of "large deformation under small force," allowing for precise control of the compression amount to output the target pressure within a limited installation space. Combined with the limiting component 7, the required compression amount, such as 2.7 mm, can be calculated based on the strain gauge contact area and the target pressure, such as 0.4 MPa, achieving quantitative setting and stable output of pressure. This avoids pressure deviations caused by the uncertain elastic modulus or uncontrollable compression of traditional elastic elements 6.

[0033] In some implementations, reference Figures 2-8The elastic element 6 is made of 17-7PH stainless steel. Using 17-7PH stainless steel ensures that its elastic modulus is minimally affected by temperature within the baking temperature range of 150℃ to 180℃, and that the pressure output does not drift with temperature fluctuations, guaranteeing consistent pressing pressure during the baking and curing process. This is superior to the defects of soft materials such as silicone, which are prone to softening or performance degradation at high temperatures. Furthermore, 17-7PH stainless steel possesses excellent fatigue resistance and corrosion resistance, and is not easily deformed or failed under repeated compression, high-temperature baking, and long-term use conditions, reducing replacement frequency and contributing to an extended overall service life of the tooling.

[0034] Further, refer to Figures 2-8 In some embodiments, the wave spring is placed in the groove between the upper pressure plate 1 and the upper fixing plate 3, with both ends embedded in the groove for positioning, forming a stable pressure transmission path to ensure that the pressure acts perpendicularly on the strain gauge area and avoids off-center loading or local pressure concentration.

[0035] In some implementations, reference Figures 2-8 The edges of the first notch 11 and the second notch 21 are chamfered. The chamfered edges of the first notch 11 and the second notch 21 facilitate guiding insertion and avoid scratching the square strain beam 110 or strain gauge during installation. refer to Figures 2-8 In some embodiments, one of the lower fixing plate 4 and the lower pressure plate 2 is provided with a positioning boss 41, and the other of the lower fixing plate 4 and the lower pressure plate 2 is provided with a positioning groove (not shown in the figure). The positioning boss 41 extends at least partially into the positioning groove to limit the horizontal displacement of the lower pressure plate 2. The positioning boss 41 and the positioning groove are designed to effectively limit the horizontal displacement of the lower pressure plate 2, ensuring that the pressure plate is accurately aligned with the square strain beam 110.

[0036] Further, refer to Figures 2-8 In the optimal implementation, the upper pressure plate 1 and the lower pressure plate 2 have the same structure and shape, which can reduce the complexity of the overall component structure, facilitate processing and manufacturing, and meet the requirements for pressing the strain gauges on the corresponding side of the square strain beam 110 on the sensor 100.

[0037] refer to Figures 2-8 In some embodiments, the tooling for pressing the strain gauge further includes at least one lateral limiting member 10, which is connected to the connecting assembly 5. The lateral limiting member 10 is configured to limit and abut against one side of the sensor 100 between the upper pressure plate 1 and the lower pressure plate 2. The lateral limiting member 10 abuts against the side of the sensor 100 to prevent the sensor 100 from shifting during multiple pressing operations, thereby improving the overall structural stability.

[0038] refer to Figures 2-8In some embodiments, the connecting assembly 5 includes at least two connecting rods 51. One end of each connecting rod 51 passes through the upper fixing plate 3, and the other end of each connecting rod 51 is connected to the lower fixing plate 4. Each connecting rod 51 extends in the parallel direction of the upper pressure plate 1 and the lower pressure plate 2. By using at least two connecting rods 51 to connect the upper fixing plate 3 and the lower fixing plate 4, the overall force is evenly distributed and the pressure transmission is stable after the upper fixing plate 3 and the lower fixing plate 4 are fixedly connected. The connecting rods 51 passing through the upper fixing plate 3 and connecting to the lower fixing plate 4 ensure the rigidity and positioning accuracy of the overall structure.

[0039] In some implementations, reference Figures 2-8 The connecting rod 51 is a fully threaded screw, which can provide a threaded connection structure for the installation of other components.

[0040] Further, refer to Figures 2-8 The number of connecting rods 51 can be 4, and the 4 connecting rods 51 are arranged in an equally spaced array around the upper fixing plate 3 and the lower fixing plate 4.

[0041] refer to Figures 2-8 In some embodiments, the limiting component 7 includes a limiting nut 71, which is threadedly connected to the connecting rod 51. The distance between the limiting nut 71 and the upper fixing plate 3 is adjustable. The limiting nut 71 is configured to abut against the side of the upper fixing plate 3 facing the lower fixing plate 4 when the upper fixing plate 3 and the lower fixing plate 4 are locked together. The limiting nut 71 is threadedly connected to the connecting rod 51 and its position is adjustable, enabling precise setting and adjustment of pressure.

[0042] In some implementations, reference Figures 2-8 The quick-lock assembly 8 includes a bayonet portion 81, a locking rod 82, and a locking nut 83. The bayonet portion 81 is located on the upper fixed plate 3 and can be integrally formed with or separate from the upper fixed plate 3, preferably integrally formed. The locking rod 82 is rotatably mounted on the connecting assembly 5 and can move between a locked position and an unlocked position. In the locked position, the locking rod 82 passes through the bayonet portion 81, and in the unlocked position, the locking rod 82 moves out of the bayonet portion 81. The locking nut 83 is threaded onto the locking rod 82 when the locking rod 82 is in the locked position to lock the upper fixed plate 3 and the lower fixed plate 4. The quick-lock assembly 8 uses a bayonet portion 81, locking rod 82, and locking nut 83 in a simple structure, requiring no special tools, allowing for quick assembly and disassembly, and is suitable for high-frequency loading and unloading scenarios, thus improving production efficiency.

[0043] Explanatoryly, taking an optimal implementation as an example, the pressure adjustment principle of the limit nut 71 in conjunction with the quick-lock assembly 8 is as follows: To obtain an accurate pressure value, based on the target pressure of 0.4 MPa for the strain gauge and a contact area of ​​214.4 mm², the required target pressure is calculated to be 85.76 N (pressure = pressure × area). Combining this with the selected wave spring coefficient of 31.84 N / mm, the spring compression is calculated to be approximately 85.76 ÷ 31.84 ≈ 2.7 mm. Therefore, after the upper fixing plate 3 is naturally placed above the wave spring, the distance between the upper fixing plate 3 and the uppermost limiting nut 71 (threaded connection to the connecting rod 51) is set to 2.7 mm. This can be adjusted by tightening the limiting nut 71, which in turn limits the downward displacement of the upper fixing plate 3, ultimately locking the compression of the wave spring and ensuring the output pressure remains stable within the target range. Simultaneously, the pressure can be adjusted within the range of 0.2 to 0.6 MPa by fine-tuning the position of the limiting nut 71.

[0044] In addition, in order to reduce the excessive gravitational pressure exerted on the upper pressure plate 1 and lower pressure plate 2 by the weight of other components, the upper fixing plate 3 and lower fixing plate 4 can be made of high-strength aluminum plates, thus making the influence of other components negligible.

[0045] Further reference Figures 2-8 The quick-lock assembly 8 also includes an adapter plate 84, which is mounted on the connecting rod 51 and located below the limiting nut 71. A positioning nut 85 is also provided below the adapter plate 84, thereby clamping the adapter plate 84 between the adapter plate 84 and the limiting nut 71 to fix the position of the adapter plate 84. One end of the locking rod 82 is pivotally connected to the adapter plate 84, which can be tilted to adjust the locking rod 82 to the locked or unlocked position by tilting.

[0046] refer to Figures 2-8 The embodiments of this application also provide a strain gauge pressing method, which employs the tooling for pressing strain gauges provided in any of the above embodiments. The strain gauge pressing method includes: Step 1: Attach the strain gauges to the upper and lower sides of the square strain beam 110 of the sensor 100; Step 2: Install the lower pressure plate 2 on the lower fixing plate 4, and engage the lower pressure plate 2 with the square strain beam 110 through the second notch 21 to clamp the strain gauge on the lower side of the square strain beam 110 of the sensor 100 in the second notch 21. Step 3: The upper pressure plate 1 is engaged with the square strain beam 110 above the first notch 11 to hold the strain gauge on the upper side of the square strain beam 110 of the sensor 100 in the first notch 11. Step 4: Place the elastic element 6 above the upper pressure plate 1, and place the upper fixing plate 3 above the elastic element 6; Step 5: Pre-adjust the limiting component 7 on the connecting component 5 at the calculated position, so as to adjust the compression amount of the elastic element 6 through the limiting component 7 and set the target pressing pressure; Step 6: Press the upper fixing plate 3 so that it abuts against the limiting component 7, and lock the upper fixing plate 3 and the lower fixing plate 4 together by the quick-lock component 8 for pressing and installing the strain gauge.

[0047] In some implementations, reference Figures 2-8 The strain gauge pressing method also includes: Step 7: Place the tooling for pressing the strain gauge, along with the sensor 100, into a baking equipment for curing; preferably, the baking temperature is controlled between 150°C and 180°C.

[0048] Step 8: After cooling, unlock the quick-lock assembly 8 and remove the sensor 100.

[0049] Furthermore, it is preferred that the elastic element 6 is made of 17-7PH stainless steel, the spacer 9 is made of PTFE, and the upper pressure plate 1 and the lower pressure plate 2 are made of PTFE.

[0050] Furthermore, when only one sensor 100 is being press-fitted with a strain gauge, the spacer 9 is not required. When multiple sensors 100 are being press-fitted simultaneously, step 1, attaching the strain gauge to the upper and lower sides of the square strain beam 110 of the sensor 100, may include: Strain gauges are attached to the upper and lower sides of the square strain beam 110 of each corresponding sensor 100; Multiple sensors 100 are stacked side-by-side, with spacers 9 sandwiched between two adjacent sensors 100. The spacers 9 have opposing first and second sides. The first side has a first pressing part 91 for abutting against the side of the square strain beam 110 corresponding to one sensor 100, and the second side has a second pressing part 92 for abutting against the side of the square strain beam 110 corresponding to another adjacent sensor 100. This presses the corresponding strain gauges firmly onto the sides of the square strain beam 110 corresponding to the two adjacent sensors 100. During heat curing, the entire fixture can enter the baking equipment along with the sensors 100 to avoid displacement caused by disassembly during the process. After cooling, the sensors 100 are unlocked and removed, ensuring stable pressure during curing and improving yield and process efficiency.

[0051] Explanatoryly, the multiple sensor sets 100 can be 3 sets, 6 sets, or more. Correspondingly, a suitable length of connecting assembly 5 can be used. Furthermore, in scenarios where the tooling for press-fitting the strain gauge includes at least one side limiting member 10, the side limiting member 10 is connected to the connecting assembly 5 and is configured to limit the contact of one side of the sensor 100 between the upper pressure plate 1 and the lower pressure plate 2. Therefore, the number and position of the side limiting members 10 can be flexibly selected or adjusted as needed to limit the sensor 100 and improve the overall stability of the tooling.

[0052] Furthermore, the above steps define the final state of the assembly. Those skilled in the art can make adaptive selections and adjustments for the specific implementation methods of each step. For example, multiple sets of sensors 100 can be stacked together and then placed on the lower pressure plate 2, or the sensors 100 can be stacked one by one from bottom to top on the lower pressure plate 2, with spacers 9 clamped between adjacent sensors 100 simultaneously.

[0053] When pressing six or more sets of sensors, the tooling used for pressing strain gauges after the sensors are loaded can be laid horizontally, thereby reducing the impact of the weight of each component on pressure control.

[0054] Finally, it should be noted that the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above-described embodiments are merely one implementation of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A tooling for press-fitting strain gauges, characterized in that, include: The upper pressure plate (1) and the lower pressure plate (2) are provided with a first notch (11) for fitting with the upper side of the square strain beam (110) of the sensor (100), and the lower pressure plate (2) is provided with a second notch (21) for fitting with the lower side of the square strain beam (110) of the sensor (100), so as to press the strain gauges tightly against the upper and lower sides of the square strain beam (110) of the sensor (100); The upper fixing plate (3), the lower fixing plate (4) and the connecting assembly (5) are connected by the connecting assembly (5), and the upper pressure plate (1) and the lower pressure plate (2) are disposed between the upper fixing plate (3) and the lower fixing plate (4). An elastic element (6) is disposed between the upper pressure plate (1) and the upper fixed plate (3) to provide pressing pressure; A limiting component (7) is provided on the connecting component (5) to limit the clamping distance between the upper pressure plate (1) and the upper fixing plate (3) in order to limit the compression of the elastic element (6) and adjust the pressing pressure. The quick-lock assembly (8) has a locking position and an unlocking position for locking the upper fixing plate (3) and the lower fixing plate (4) in the locking position and unlocking the upper fixing plate (3) and the lower fixing plate (4) in the unlocking position.

2. The tooling for press-fitting strain gauges according to claim 1, characterized in that, Also includes: Spacer (9) is used to be placed between two adjacent sensors (100) when multiple sets of sensors (100) are pressed together at the same time. The spacer (9) has a first side and a second side. The first side is provided with a first pressing part (91) for fitting with the side of the square strain beam (110) corresponding to one sensor (100). The second side is provided with a second pressing part (92) for fitting with the side of the square strain beam (110) corresponding to another adjacent sensor (100) so as to press the corresponding strain gauges onto the side of the square strain beam (110) corresponding to the two adjacent sensors (100).

3. The tooling for press-fitting strain gauges according to claim 2, characterized in that, The spacer (9) is an integrated structure and the material of the spacer (9) is PTFE.

4. The tooling for press-fitting strain gauges according to claim 1, characterized in that, The upper pressure plate (1) and the lower pressure plate (2) are made of PTFE; the elastic element (6) is a wave spring; and / or the elastic element (6) is made of 17-7PH stainless steel; and / or the edges of the first recess (11) and the second recess (21) are chamfered.

5. The tooling for mounting strain gauges or for pressing strain gauges according to claim 1, characterized in that, One of the lower fixing plate (4) and the lower pressure plate (2) is provided with a positioning boss (41), and the other is provided with a positioning groove. The positioning boss (41) extends at least partially into the positioning groove to limit the horizontal displacement of the lower pressure plate (2); and / or, The tooling for press-fitting strain gauges also includes at least one lateral limiting member (10) connected to the connecting assembly (5), the lateral limiting member (10) being configured to limit abutment against one side of the sensor (100) between the upper pressure plate (1) and the lower pressure plate (2).

6. The tooling for press-fitting strain gauges according to claim 1, characterized in that, The connecting assembly (5) includes at least two connecting rods (51), one end of which passes through the upper fixing plate (3) and the other end is connected to the lower fixing plate (4). Each connecting rod (51) extends in the parallel direction of the upper pressure plate (1) and the lower pressure plate (2).

7. The tooling for press-fitting strain gauges according to claim 6, characterized in that, The limiting component (7) includes a limiting nut (71) threaded to the connecting rod (51). The distance between the limiting nut (71) and the upper fixing plate (3) is adjustable. The limiting nut (71) is configured to abut against the side of the upper fixing plate (3) facing the lower fixing plate (4) when the upper fixing plate (3) and the lower fixing plate (4) are locked together. The connecting rod (51) is a fully threaded screw.

8. The tooling for press-fitting strain gauges according to claim 1, characterized in that, The quick-lock assembly (8) includes: The bayonet part (81) is set on the upper fixing plate (3); A locking rod (82) is rotatably disposed on the connecting assembly (5). The locking rod (82) is movable in a locked position and an unlocked position. In the locked position, the locking rod (82) passes through the bayonet portion (81), and in the unlocked position, the locking rod (82) moves out of the bayonet portion (81). A locking nut (83) is threaded onto the locking rod (82) when the locking rod (82) is in the locking position to lock the upper fixing plate (3) and the lower fixing plate (4).

9. A method for press-fitting strain gauges, characterized in that, The tooling for press-fitting strain gauges according to any one of claims 1-8, wherein the strain gauge press-fitting method comprises: Strain gauges are attached to the upper and lower sides of the square strain beam (110) of the sensor (100); The lower pressure plate (2) is installed on the lower fixing plate (4), and the lower pressure plate (2) is engaged with the lower square strain beam (110) through the second notch (21) so as to clamp the strain plate on the lower side of the square strain beam (110) of the sensor (100) in the second notch (21); The upper pressure plate (1) is engaged above the square strain beam (110) through the first notch (11) so as to clamp the strain gauge on the upper side of the square strain beam (110) of the sensor (100) in the first notch (11); Place the elastic element (6) above the upper pressure plate (1) and place the upper fixing plate (3) above the elastic element (6); The limiting component (7) is pre-adjusted to the calculated position on the connecting component (5) so as to adjust the compression of the elastic element (6) through the limiting component (7) and set the target pressing pressure; The upper fixing plate (3) is pressed so that it abuts against the limiting component (7), and the upper fixing plate (3) and the lower fixing plate (4) are locked by the quick-lock component (8) for press-fitting strain gauges.

10. The strain gauge pressing method according to claim 9, characterized in that, Also includes: The tooling for pressing the strain gauges, along with the sensor (100) that has been pressed, is placed together in a baking equipment for curing. After cooling, unlock the quick-lock assembly (8) and remove the sensor (100).

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