A force sensor structure

Abstract

The application provides a force sensor structure and belongs to the technical field of force sensors.The application comprises a sensor body and further comprises a buffer cooling assembly and an oil separation and dust prevention assembly.The isolation cover is combined with a multistage buffer system, the impact force of a stamping head is greatly attenuated through the cooperative deformation of springs and air bags and the action of friction, and the isolation cover can also prevent pollutants from entering, thereby improving the reliability of the sensor.A passive cooling system driven based on a stamping stroke is synchronously operated with the stamping process, forced convection heat exchange of the top plate is realized by using gas discharge when the pressing plate is reset, and the sensor can ensure fast response to load changes;when the stamping is pressed, a bellows constructs a physical sealing barrier, and an air bag seals the top space, thereby reducing the invasion of pollutants;in the stamping reset stage, one-way gas realizes passive cooling, the influence of temperature on precision is reduced, and another way of gas forms a positive pressure air curtain, actively sweeps dust and oil mist, realizes air heat exchange in the sealed cavity, and guarantees stable operation of the sensor.

Description

Technical Field

[0001] This invention relates to the field of force sensor technology, and more specifically, to a force sensor structure. Background Technology

[0002] In the modern industrial stamping field, strain gauge force sensors, as key force monitoring elements, are widely used in load measurement and process control of stamping equipment.

[0003] However, existing force sensor structures still have significant defects, severely limiting their performance and application range. On the one hand, the large amount of dust and oil mist generated during stamping operations easily adheres to and accumulates on the sensor surface, not only contaminating the core components of the sensing module but also causing strain gauge signal distortion, PCB board short circuits, and other malfunctions, resulting in a significant decrease in measurement accuracy and making it difficult to meet the detection requirements of precision stamping processes. On the other hand, during the stamping process, the elastomer is subjected to periodic alternating loads, and frequent stress deformation generates strain heat. Combined with the heat conduction from the environment, this causes the sensor to operate at high temperatures for extended periods. The thermal stress caused by high temperatures accelerates the fatigue failure of the elastomer material, significantly shortening the sensor's lifespan. At the same time, the elastic modulus of the elastomer changes with temperature fluctuations, and the resistance value of the strain gauge also shifts due to the temperature drift effect, leading to increased measurement errors and making it impossible to guarantee data accuracy.

[0004] How to invent a force sensor structure to solve these problems has become an urgent issue for those skilled in the art. Summary of the Invention

[0005] To overcome the above deficiencies, the present invention provides a force sensor structure, which aims to solve the problems mentioned in the background.

[0006] This invention is implemented as follows: This invention provides a force sensor structure, including a sensor body, which comprises a sensing module, an isolation cover, and a mounting flange. The isolation cover is fitted over the outside of the sensing module, and the mounting flange is installed at the bottom of the sensing module. The structure also includes: Buffer cooling assembly: The buffer cooling assembly is disposed inside the isolation cover; Oil-proof and dust-proof component: The oil-proof and dust-proof component is located at the bottom of the sensing module.

[0007] Preferably, the sensing module includes a base plate, a housing, and a top plate. The bottom inner side of the housing is provided with several positioning blocks. The housing is fixed to the base plate by the positioning blocks. An elastomer is provided on the inner side of the housing. Strain gauges are bonded to the bridge portion of the elastomer. The top plate is fixed on the upper side of the elastomer. An adapter plate is installed at the bottom of the elastomer. A PCB board is installed on the top of the base plate. A contact block is fixedly installed on the inner top of the isolation cover.

[0008] Preferably, the elastomer has three bridges, and each bridge has four strain gauges attached to it. The pins of the strain gauges are all soldered to an adapter plate. The adapter plate is electrically connected to the PCB board, and the adapter plate matches the circular area in the middle of the elastomer.

[0009] Preferably, the buffer cooling assembly includes an installation cylinder and a slot on the top of the housing. A locking block is fixedly connected to the top of the installation cylinder, and the locking block matches the slot. The locking block is fixed to the slot by adhesive. A guide groove is provided inside the locking block. A receiving plate is fixedly connected to the bottom of the installation cylinder. A pressure plate is slidably connected inside the installation cylinder. A connecting rod is fixedly connected to the top of the pressure plate. The top end of the connecting rod penetrates the side wall of the locking block and its end is fixed to the inner top wall of the isolation cover. An airbag is fixedly installed inside the receiving plate. A one-way valve is installed on the side wall of the installation cylinder near the locking block.

[0010] Preferably, the slots are distributed equidistantly in a ring around the central axis of the isolation cover, the airbags are arranged in a ring, there is a gap between the inner sidewall of the airbag and the outer sidewall of the shell, the bottom of the receiving plate is flush with the bottom wall of the base plate, and the top of the airbag is fixedly and sealed to the bottom of the mounting cylinder.

[0011] Preferably, the connecting rod has an air guide cavity inside, with an air inlet on the side wall near the bottom of the air guide cavity and an exhaust port on the side wall near the top of the air guide cavity.

[0012] Preferably, when the spring is in its initial state, the exhaust port corresponds to the position of the guide groove, the inner bottom wall of the isolation cover abuts against the bottom of the receiving plate, the guide groove is inclined downward and its port faces the surface of the top plate, the contact block when the inner top wall of the isolation cover is in contact with the upper surface of the card block, and the bottom of the pressure plate is in contact with the top of the airbag.

[0013] Preferably, the sensor body is fixedly installed inside the stamping die base via a mounting flange.

[0014] Preferably, the oil-separating and dust-proof assembly includes a corrugated pipe and an installation groove opened at the bottom of the base plate. The upper end of the corrugated pipe is connected to the inner top wall of the installation groove, and the lower end is connected to the inner bottom wall of the isolation cover. Several air guide holes are opened on the side wall of the corrugated pipe near the inner top wall of the installation groove.

[0015] Preferably, the air guide holes are distributed in a ring at equal intervals, and the air guide holes are in a blocked state when the inner bottom wall of the isolation cover is in contact with the bottom of the base plate.

[0016] The beneficial effects of this invention are: By installing the isolation cover, the impact energy of the stamping head can be reduced on the one hand, and the stamping oil mist and dust can be prevented from entering the sensing module through the radial gap on the other hand. At the same time, the multi-point support frame formed by the ring distribution of the mounting cylinder disperses the off-center load moment through the elastic deformation of the spring, reducing the maximum additional bending moment borne by the sensing module and avoiding local overload failure. Through the cooperation of the deformation of the spring, the airbag, and the friction between the airbag and the inner wall of the isolation cover, a complete multi-level buffer system is formed, which can effectively attenuate the powerful impact force of the stamping head, keep the load transmitted to the sensing module within a safe range, and make the entire buffering process more uniform, reducing the instantaneous impact on the sensing module and further improving the stability and reliability of the sensor.

[0017] The passive cooling system based on the stamping stroke drive uses gas discharge to force convection heat transfer to the top plate when the pressure plate is reset, effectively suppressing the elastic modulus drift and strain gauge resistance temperature drift caused by temperature changes. Moreover, the passive cooling system operates synchronously with the stamping process, and can carry out an effective heat exchange in each stamping cycle. Even in high-frequency stamping, it can remove heat in time, keeping the sensor in a suitable operating temperature range, ensuring that it responds quickly and accurately to load changes, and realizing real-time and accurate monitoring of the stamping process.

[0018] The double-corrugated pipes and airbags form a double-layer protection system. The corrugated pipes create a physical sealing barrier through expansion and contraction, preventing contaminants from entering from the bottom during the stamping and pressing process. After being compressed and deformed, the airbags seal the top space, preventing contaminants from entering the core area of ​​the sensing module with the gas flow. The combination of the two reduces the amount of contaminant intrusion. During the stamping and resetting stage, the gas is divided into two paths. One path is discharged through the air guide cavity and flow channel and blown towards the top plate, carrying away the heat of the elastomer and achieving passive cooling, reducing the impact of temperature on sensor accuracy. The other path is discharged from the air guide hole to form a positive pressure air curtain, actively blowing away the attached dust and oil mist. This not only prevents contaminants from being accidentally inhaled, but also achieves heat exchange of the air inside the sealed cavity through gas flow, maintaining a clean environment inside the cavity and ensuring stable operation of the sensor. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the isolation cover of the present invention; Figure 3This is a front cross-sectional structural diagram of the present invention; Figure 4 This is a schematic diagram of the cross-sectional structure of the mounting cylinder of the present invention; Figure 5 This is a front view schematic diagram of the cross-sectional structure of the mounting cylinder of the present invention; Figure 6 This is a schematic diagram of the cross-sectional structure of the connecting rod of the present invention; Figure 7 This is a schematic diagram of the structure of the present invention during stamping; Figure 8 This is a schematic diagram of a partial explosion structure of the present invention; Figure 9 This is a schematic diagram of the elastomer and strain gauge structure of the present invention; Figure 10 This is a schematic diagram of the mounting groove structure of the present invention; Figure 11 This is a schematic diagram of the receiving plate and slot structure of the present invention.

[0021] In the diagram: 1. Sensor body; 2. Base plate; 3. Mounting cylinder; 4. Airbag; 5. Bellows; 10. Sensing module; 11. Isolation cover; 12. Mounting flange; 20. Mounting groove; 21. Housing; 22. Top plate; 23. PCB board; 30. One-way valve; 31. Locking block; 32. Pressure plate; 33. Connecting rod; 34. Spring; 35. Receiving plate; 51. Air duct; 111. Contact block; 211. Positioning block; 212. Elastomer; 213. Adapter plate; 214. Locking groove; 311. Flow guide groove; 331. Air duct chamber; 332. Air inlet; 333. Exhaust port; 2121. Strain gauge. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1, refer to Figures 1-11 A force sensor structure includes a sensor body 1, which comprises a sensing module 10, an isolation cover 11, and a mounting flange 12. The isolation cover 11 is fitted onto the outside of the sensing module 10, and the mounting flange 12 is mounted on the bottom of the sensing module 10. The structure also includes: Buffer cooling assembly: The buffer cooling assembly is located inside the isolation cover 11; Oil-proof and dust-proof component: The oil-proof and dust-proof component is located at the bottom of the sensing module 10.

[0024] Furthermore, the sensor body 1 is fixedly installed in the stamping die base by the mounting flange 12. The isolation cover 11 can reduce the impact energy of the stamping head and prevent stamping oil mist and dust from entering the sensing module 10 through the radial gap. The sensing module 10 includes a base plate 2, a housing 21 and a top plate 22. Several positioning blocks 211 are provided on the bottom inner side of the housing 21. The housing 21 is fixed to the base plate 2 by the positioning blocks 211. An elastic body 212 is provided on the inner side of the housing 21. Strain gauges 2121 are bonded to the bridge part of the elastic body 212. The top plate 22 is fixed on the upper side of the elastic body 212. An adapter plate 213 is installed at the bottom of the elastic body 212. A PCB board 23 is installed on the top of the base plate 2. A contact block 111 is fixedly installed on the top inner side of the isolation cover 11.

[0025] The elastomer 212 has three bridges. The multi-bridge structure can distribute the stamping load and avoid stress concentration at a single point, which could lead to overload damage to the elastomer 212. Each bridge has four strain gauges 2121 attached to it. They can be combined using a Wheatstone bridge circuit to improve the force measurement sensitivity and anti-interference capability. The pins of the multiple strain gauges 2121 are all soldered to the adapter plate 213, which converts them into a bridge circuit. The adapter plate 213 is electrically connected to the PCB board 23. The adapter plate 213 matches the circular area in the middle of the elastomer 212 to ensure that the adapter plate 213 and the elastomer 212 deform synchronously and avoid signal distortion due to loose connection.

[0026] Furthermore, the buffer cooling assembly includes a mounting cylinder 3 and a slot 214 on the top of the housing 21. A locking block 31 is fixedly connected to the top of the mounting cylinder 3, and the locking block 31 matches the slot 214. The locking block 31 is fixed to the slot 214 by adhesive. A guide groove 311 is provided inside the locking block 31. A receiving plate 35 is fixedly connected to the bottom of the mounting cylinder 3. A pressure plate 32 is slidably connected inside the mounting cylinder 3. A connecting rod 33 is fixedly connected to the top of the pressure plate 32. The top end of the connecting rod 33 penetrates the side wall of the locking block 31 and its end is fixed to the inner top wall of the isolation cover 11. An airbag 4 is fixedly installed inside the receiving plate 35. A one-way valve 30 is installed on the side wall of the mounting cylinder 3 near the locking block 31. An air guide chamber 331 is provided inside the connecting rod 33. An air inlet 332 is provided on the side wall of the air guide chamber 331 near the bottom of the air guide chamber 331. The side wall of the air guide cavity 331 at the top is provided with an exhaust port 333. During the stamping, the stamping head first contacts the isolation cover 11 and gradually presses down the isolation cover 11 to overcome the elastic force of the spring 34. When the contact block 111 on the inner top wall of the isolation cover 11 contacts the top plate 22, the connecting rod 33 drives the pressure plate 32 to compress the air bag 4. At this time, the internal space of the mounting cylinder 3 above the pressure plate 32 increases, forming a negative pressure. Air is drawn in through the one-way valve 30. After the stamping head is reset, the isolation cover 11 is reset under the action of the spring 34. At this time, the air inside the mounting cylinder 3 above the pressure plate 32 will enter the air guide cavity 331 through the air inlet 332 and be discharged through the exhaust port 333 and the guide groove 311. During the stamping of the stamping head, the spring 34, the deformation of the air bag 4 and the friction between the deformed air bag 4 and the inner wall of the isolation cover 11 will be buffered in sequence.

[0027] The slots 214 are distributed in a ring at equal intervals around the central axis of the isolation cover 11. The airbags 4 are arranged in a ring. There is a gap between the inner sidewall of the airbag 4 and the outer sidewall of the shell 21 to ensure that it can deform within a certain range, while ensuring that gas can flow through the gap. The bottom of the receiving plate 35 is flush with the bottom wall of the base plate 2. The top of the airbag 4 is fixedly and sealed to the bottom of the mounting cylinder 3. When the pressure plate 32 moves down, the pressure plate 32 first pushes the gas in the mounting cylinder 3 into the airbag 4, and then squeezes the airbag 4. This can effectively absorb the impact vibration energy and avoid the impact load from acting directly on the elastic body 212, thus protecting the sensing module 10.

[0028] It should be noted that the exhaust port 333 of the spring 34 in its initial state corresponds to the position of the guide groove 311, the inner bottom wall of the isolation cover 11 abuts against the bottom of the receiving plate 35, the guide groove 311 is inclined downward and its port faces the surface of the top plate 22, ensuring that the gas ejected through the guide groove 311 can directly act on the surface of the top plate 22, carrying away the heat generated by the stamping, thereby reducing the temperature of the elastomer 212 and achieving passive cooling. When the inner top wall of the isolation cover 11 is in contact with the upper surface of the card block 31, the contact block 111 is in contact with the upper surface of the top plate 22, and the bottom of the pressure plate 32 is in contact with the top of the airbag 4.

[0029] In this embodiment, during the stamping process, the stamping head first contacts the isolation cover 11 and gradually presses down on the isolation cover 11. When the isolation cover 11 moves down, it overcomes the elastic force of the spring 34 and drives the connecting rod 33 to move downward. The spring 34 buffers the impact load through its own elastic deformation. When the pressure plate 32 moves down, it first pushes the gas in the mounting cylinder 3 into the airbag 4, and then squeezes the airbag 4. This design further enhances the buffering effect. The airbag 4 is compressible and deforms during the compression process. Through the compression of the gas and the friction between molecules, the compressibility and viscous damping of the gas are used to further absorb the stamping vibration energy, thereby playing a role in mitigating the impact. The impact action prevents the impact load from acting directly on the elastic body 212, protecting the sensing module 10. After multi-stage buffering by the spring 34 and the airbag 4, the residual load is transferred to the elastic body 212 of the sensing module 10, causing the bridge structure to undergo elastic deformation. The deformation of the elastic body 212 causes the strain gauges 2121 attached to the bridge to deform synchronously. According to the resistance strain effect, the resistance value of the strain gauges 2121 changes. Multiple strain gauges 2121 form a Wheatstone bridge circuit, which converts the resistance change into a voltage signal. After being amplified and filtered by the PCB board 23, an electrical signal proportional to the impact load is output to realize the force measurement function.

[0030] When the stamping head presses down on the isolation cover 11 and the pressure plate 32 compresses the air bladder 4, the internal space of the mounting cylinder 3 above the pressure plate 32 increases, creating a negative pressure. Air is drawn in through the one-way valve 30. When the stamping head resets, the isolation cover 11 resets under the action of the spring 34. At this time, the air inside the mounting cylinder 3 above the pressure plate 32 enters the air guide chamber 331 through the air inlet 332 and is discharged through the exhaust port 333 and the guide groove 311. The discharged gas directly acts on the surface of the top plate 22, using the flow of gas to carry away the heat generated by the stamping, thereby reducing the temperature of the elastomer 21. The passive cooling system, operating at a temperature of 2°C, minimizes zero-point drift and sensitivity drift caused by temperature changes, ensuring stable and accurate sensor output and maintaining high-precision measurements. Furthermore, the passive cooling system operates synchronously with the stamping process, enabling effective heat exchange with each stamping cycle. Even during high-frequency stamping (e.g., dozens of times per minute or higher), heat is promptly removed, keeping the sensor within its optimal operating temperature range. This ensures rapid and accurate response to load changes, enabling real-time and precise monitoring of the stamping process.

[0031] By setting the isolation cover 11, the impact energy of the stamping head can be reduced on the one hand, and the stamping oil mist and dust can be prevented from entering the sensing module 10 through the radial gap on the other hand. The mounting cylinders 3 are distributed equidistantly in a ring along the central axis of the isolation cover 11. Each set of mounting cylinders 3 is connected to the slot 214 of the housing 21 through the locking block 31 to form a multi-point support frame. When the stamping head applies an eccentric load torque, each mounting cylinder 3 disperses the torque through the elastic deformation of the spring 34, reducing the maximum additional bending moment borne by the sensing module 10 and avoiding the sensing module 10 from being subjected to local overload.

[0032] Spring 34 first functions when the stamping head contacts and presses down on the isolation cover 11. As the isolation cover 11 moves downward, the compression of spring 34 gradually increases, and the elastic force it generates also increases linearly, thus converting some of the impact energy into the elastic potential energy of spring 34 for storage. The initial buffering of spring 34 can effectively reduce the rate of increase of the impact load and prevent the sensing module 10 from being subjected to excessive impact force instantaneously. Through this stage of buffering, the impact force transmitted to subsequent buffering stages can be initially attenuated, creating more favorable conditions for the buffering of airbag 4. At the same time, it also plays a certain damping role in the downward movement of isolation cover 11, slowing down its downward speed. Due to the gas injection and the compression of pressure plate 32, airbag 4 will deform accordingly. At this time, the side wall of airbag 4 will come into contact with the inner wall of isolation cover 11, and its outer surface will... The friction force creates a relative motion tendency with the inner wall of the isolation cover 11, thus generating friction. The presence of friction adds additional damping to the buffering process, making the downward movement of the isolation cover 11 smoother and reducing vibration caused by impact fluctuations. Although the buffering force generated by friction is relatively small compared to the buffering force of spring 34 and airbag 4, it can effectively suppress high-frequency vibration and rebound during the buffering process. Through the cooperation of the deformation of spring 34, airbag 4 and friction between airbag 4 and the inner wall of isolation cover 11, a complete multi-level buffering system is formed, which can effectively attenuate the powerful impact force of the stamping head, keep the load transmitted to the sensing module 10 within a safe range, and make the entire buffering process more uniform, reducing the instantaneous impact on the sensing module 10 and further improving the stability and reliability of the sensor.

[0033] Example 2, refer to Figures 3-8 The oil-proof and dust-proof component includes a bellows 5 and a mounting groove 20 at the bottom of the base plate 2. The upper end of the bellows 5 is connected to the inner top wall of the mounting groove 20 and the lower end is connected to the inner bottom wall of the isolation cover 11, forming a sealed cavity that can expand and contract with the relative movement of the sensor components. This cavity can adapt to the relative displacement between the isolation cover 11 and the base plate 2 during the stamping process and maintain good sealing performance, preventing oil and dust from entering the sensor module 10 from the bottom gap. Several air guide holes 51 are provided on the side wall of the bellows 5 near the inner top wall of the mounting groove 20 to prevent oil and dust from entering the sealed cavity through the air guide holes 51.

[0034] It should be noted that the air guide holes 51 are distributed in a ring at equal intervals. When the bottom wall of the inner wall of the isolation cover 11 is attached to the bottom of the base plate 2, the air guide holes 51 are in a blocked state. At this time, a closed space is formed inside the bellows 5, and the gas is stored in the space at the top of the airbag 4. During the stamping process, as the isolation cover 11 separates from the base plate 2, the bellows 5 extends. At this time, the airbag 4 deforms and temporarily seals the space at the top of the airbag 4. At the same time, the air guide holes 51 open. On the one hand, a negative pressure can be effectively formed to replenish the gas into the sealed cavity through the air guide holes 51. On the other hand, a second barrier can be formed to prevent oil and dust from contaminating the top plate 22.

[0035] In this embodiment, when the stamping head presses down on the isolation cover 11, the isolation cover 11 separates from the base plate 2, and the bellows 5 extends as the isolation cover 11 moves down, increasing the volume of the sealed cavity and reducing the internal air pressure to form a negative pressure environment. The bellows 5 serves as the first barrier, and the air guide hole 51 is close to the top of the bellows 5, which can effectively prevent oil and dust from contaminating the top plate 22. At this time, the airbag 4 is deformed by the pressure plate 32, and its top is tightly fitted with the inner wall of the mounting cylinder 3, temporarily sealing the top space of the airbag 4 to prevent pollutants from entering the core area of ​​the sensing module 10 through gas flow. At this time, the airbag 4 can form the second barrier. Under the action of pressure difference, the outside air flows into the sealed cavity through the air guide hole 51 to quickly replenish the gas and serve as a passive cooling reserve gas source for the subsequent stamping return stroke.

[0036] During the stamping and resetting process, the bellows 5 contracts accordingly, and the airbag 4 returns to its original shape. At this time, some gas will be introduced into the airbag 4 through the gap between the airbag 4, the isolation cover 11, and the shell 21, and discharged through the air guide cavity 331 and the guide groove 311, blowing towards the top plate 22 to achieve passive cooling. The other part of the gas will be discharged through the air guide hole 51, forming a positive pressure environment, blowing away the attached dust or oil mist, and preventing pollutants from being accidentally sucked into the sensing module 10 by negative pressure during the stamping process. At the same time, it can also achieve heat exchange of the air inside the sealed cavity.

[0037] The bellows 5 and the airbag 4 form a double-layer protective structure. The bellows 5 constructs a physical sealing barrier through expansion and contraction, preventing contaminants from entering from the bottom during the stamping and pressing process. After the airbag 4 is compressed and deformed, it seals the top space, preventing contaminants from entering the core area of ​​the sensing module 10 with the gas flow. The combination of the two reduces the amount of contaminant intrusion, thereby reducing the probability of sensor module 10 failure due to contamination. During the stamping and resetting stage, the gas is divided into two paths. One path is discharged through the air guide cavity 331 and the flow guide groove 311 and blown towards the top plate 22, carrying away the heat of the elastomer 212 to achieve passive cooling and reduce the impact of temperature on sensor accuracy. The other path is discharged from the air guide hole 51 to form a positive pressure air curtain, actively blowing away the attached dust and oil mist. This not only prevents contaminants from being accidentally inhaled, but also achieves heat exchange of the air inside the sealed cavity through gas flow, maintaining a clean environment inside the cavity and ensuring stable operation of the sensor.

[0038] It should be noted that the specific models and specifications of strain gauge 2121, PCB board 23, etc. need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0039] It should be noted that the specific models and specifications of strain gauge 2121, PCB board 23, etc. need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A force sensor structure, comprising a sensor body (1), wherein the sensor body (1) is composed of a sensing module (10), an isolation cover (11), and a mounting flange (12), wherein the isolation cover (11) is fitted onto the outside of the sensing module (10), and the mounting flange (12) is mounted on the bottom of the sensing module (10), characterized in that, The sensing module (10) includes a base plate (2), a housing (21), and a top plate (22). The bottom inner side of the housing (21) is provided with several positioning blocks (211). The housing (21) is fixed to the base plate (2) via the positioning blocks (211). An elastomer (212) is provided on the inner side of the housing (21). Strain gauges (2121) are bonded to the bridge portion of the elastomer (212). The top plate (22) is fixed to the upper side of the elastomer (212). A transition plate (213) is installed at the bottom of the elastomer (212). A PCB board (23) is installed on the top of the base plate (2). A contact block (111) is fixedly installed on the inner top of the isolation cover (11). The module also includes: Buffer cooling assembly: The buffer cooling assembly is disposed inside the isolation cover (11); the buffer cooling assembly includes a mounting cylinder (3) and a slot (214) opened on the top of the housing (21). A locking block (31) is fixedly connected to the top of the mounting cylinder (3). The locking block (31) matches the slot (214). The locking block (31) is fixed to the slot (214) by adhesive. A guide groove (311) is opened inside the locking block (31). A receiving plate (35) is fixedly connected to the bottom of the mounting cylinder (3). The mounting cylinder (3) is slidably connected to a pressure plate (32), and a connecting rod (33) is fixedly connected to the top of the pressure plate (32). The top of the connecting rod (33) penetrates the side wall of the locking block (31) and its end is fixed to the inner top wall of the isolation cover (11). An airbag (4) is fixedly installed inside the receiving plate (35). A one-way valve (30) is installed on the side wall of the mounting cylinder (3) near the locking block (31). The slots (214) are distributed in a ring at equal intervals around the central axis of the isolation cover (11). The airbag (4) The airbag (4) is arranged in a ring shape. There is a gap between the inner ring sidewall of the airbag (4) and the outer sidewall of the shell (21). The bottom of the receiving plate (35) is flush with the bottom wall of the base plate (2). The top of the airbag (4) is fixedly and sealed to the bottom of the mounting cylinder (3). The connecting rod (33) has an air guide cavity (331) inside. An air inlet (332) is opened on the sidewall of the air guide cavity (331) near the bottom. An air guide cavity (331) is opened on the sidewall near the top. An exhaust port (333) is provided; when the spring (34) is in its initial state, the exhaust port (333) corresponds to the position of the guide groove (311), the inner bottom wall of the isolation cover (11) abuts against the bottom of the support plate (35), the guide groove (311) is inclined downward and its port faces the surface of the top plate (22), when the inner top wall of the isolation cover (11) is in contact with the upper surface of the card block (31), the contact block (111) contacts the upper surface of the top plate (22), and the bottom of the pressure plate (32) contacts the top of the airbag (4); Oil-proof and dust-proof component: The oil-proof and dust-proof component is located at the bottom of the sensing module (10).

2. The force sensor structure according to claim 1, characterized in that, The elastomer (212) has three bridges, and each bridge has four strain gauges (2121) attached to it. The pins of the strain gauges (2121) are all soldered to the adapter plate (213). The adapter plate (213) is electrically connected to the PCB board (23). The adapter plate (213) matches the circular area in the middle of the elastomer (212).

3. The force sensor structure according to claim 1, characterized in that, The sensor body (1) is fixedly installed in the stamping die base by the mounting flange (12).

4. The force sensor structure according to claim 1, characterized in that, The oil-proof and dustproof assembly includes a corrugated pipe (5) and an installation groove (20) at the bottom of the base plate (2). The upper end of the corrugated pipe (5) is connected to the inner top wall of the installation groove (20), and the lower end is connected to the inner bottom wall of the isolation cover (11). Several air guide holes (51) are provided on the side wall of the corrugated pipe (5) near the inner top wall of the installation groove (20).

5. The force sensor structure according to claim 4, characterized in that, The air guide holes (51) are distributed in a ring at equal intervals. When the bottom wall of the inner wall of the isolation cover (11) is in contact with the bottom of the bottom plate (2), the air guide holes (51) are in a blocked state.

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