Force transducer structure

Abstract

The invention, which belongs to the technical field of the force transducer, provides a force transducer structure comprising a transducer body, a buffer cooling assembly, and an oil separation dustproof assembly. The isolation cover is combined with a multi-stage buffer system, the impact force of the stamping head is greatly attenuated through the cooperative deformation of the spring and the air bag and the action of friction force, pollutants can be prevented from entering, and the reliability of the sensor is improved; a passive cooling system based on stamping stroke driving operates synchronously with the stamping process, forced convection heat exchange is conducted on a top plate through gas exhaust when a pressing plate is reset, and it is ensured that a sensor quickly responds to load changes; during stamping and pressing, the corrugated pipe constructs a physical sealing barrier, the air bag seals the top space, and pollutant invasion is reduced; and in the stamping reset stage, one path of gas is passively cooled to reduce the influence of temperature on precision, and the other path of gas forms a positive pressure gas curtain to actively purge dust and oil mist, so that heat exchange of air in the sealed cavity is realized, and stable operation of the sensor is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of force sensors, and in particular to a force sensor structure. Background Art

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

[0003] However, the force sensor structure in the existing technology still has significant defects, which seriously restrict its performance and application scope. On the one hand, the large amount of dust and oil mist generated by the stamping operation can easily adhere to and accumulate on the sensor surface, which not only pollutes the core components of the sensor module, but also causes strain gauge signal distortion, PCB board short circuit and other faults, which greatly reduces the measurement accuracy and makes it difficult to meet the detection requirements of the precision stamping process. On the other hand, during the stamping process, the elastomer is subjected to periodic alternating loads, and the frequent force deformation generates strain heat. The superimposed environmental heat conduction effect causes the sensor to be in a high-temperature working state for a long time. The thermal stress caused by high temperature will accelerate the fatigue failure of the elastomer material and significantly shorten the service life of the sensor. At the same time, the elastic modulus of the elastomer changes with temperature fluctuations, and the strain gauge resistance value also shifts due to the temperature drift effect, resulting in increased measurement errors and an inability to guarantee data accuracy.

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

[0005] In order to make up for the above deficiencies, the present invention provides a force sensor structure, aiming to solve the problems mentioned in the above background.

[0006] The present invention is achieved in that: The present invention provides a force sensor structure, including a sensor body, wherein the sensor body is composed of a sensor module, an isolation cover, and a mounting flange, wherein the isolation cover is sleeved on the outside of the sensor module, and the mounting flange is mounted on the bottom of the sensor module, and further includes: Buffer cooling assembly: The buffer cooling assembly is arranged inside the isolation cover; Oil-proof and dust-proof component: The oil-proof and dust-proof component is arranged at the bottom of the sensor module.

[0007] Preferably, the sensing module includes a base plate, a shell and a top plate, a plurality of positioning blocks are provided on the inner bottom of the shell, the shell is fixed to the base plate through the positioning blocks, an elastomer is provided on the inner side of the shell, a strain gauge is bonded to the bridge part of the elastomer, the top plate is fixed to the upper side of the elastomer, an adapter plate is installed on the bottom of the elastomer, a PCB board is installed on the top of the base plate, and a contact block is fixedly installed on the inner top of the isolation cover.

[0008] Preferably, the elastomer is provided with three bridges, and four strain gauges are pasted on each bridge, and the pins of the multiple strain gauges are welded on the adapter board, the adapter board is electrically connected to the PCB board, and the adapter board matches the circular area in the middle of the elastomer.

[0009] Preferably, the buffer cooling assembly includes a mounting tube and a slot opened on the top of the shell, the top of the mounting tube is fixedly connected with a block, the block matches the slot, the block is fixed to the slot by gluing, a guide groove is opened inside the block, the bottom of the mounting tube is fixedly connected with a receiving plate, the inside of the mounting tube is slidably connected with a pressure plate, the top of the pressure plate is fixedly connected with a connecting rod, the top of the connecting rod passes through the side wall of the block and its end is fixed to the inner top wall of the isolation cover, an airbag is fixedly installed in the receiving plate, and a one-way valve is installed on the side wall of the mounting tube near the block.

[0010] Preferably, the card slots are distributed equidistantly in a ring shape around the central axis of the isolation cover, the airbag is arranged in a ring shape, there is a gap between the inner ring side wall of the airbag and the outer side wall 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 sealed to the bottom of the mounting tube.

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

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

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

[0014] Preferably, the oil-isolating and dust-proof component includes a bellows and a mounting groove opened at the bottom of the base plate, the upper end of the bellows is connected to the inner top wall of the mounting groove, and the lower end is connected to the inner bottom wall of the isolation cover, and a number of air guide holes are opened on the side wall of the bellows near the inner top wall of the mounting groove.

[0015] Preferably, the plurality of air guide holes are distributed in an annular shape with 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 the present invention are: By setting up the isolation cover, on the one hand, the impact energy of the punch head can be reduced, and on the other hand, the stamping oil mist and dust can be prevented from invading the sensor module through the radial gap. At the same time, the multi-point support frame formed by the annular distribution of the mounting cylinder disperses the eccentric load torque through the elastic deformation of the spring, so that the maximum additional bending moment borne by the sensor module is reduced, and local overload failure is avoided; through the cooperation of the spring, the deformation of the airbag, and the friction between the airbag and the inner wall of the isolation cover, a complete multi-stage buffering system is formed, which can effectively attenuate the strong impact force of the punch head, control the load transmitted to the sensor module within a safe range, and make the entire buffering process more uniform, reduce the instantaneous impact on the sensor module, and further improve the stability and reliability of the sensor.

[0017] The passive cooling system driven by the stamping stroke uses gas exhaust to perform forced convection heat exchange on 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. The passive cooling system runs synchronously with the stamping process, and each stamping cycle can perform an effective heat exchange. Even during high-frequency stamping, it can remove heat in time, keeping the sensor in the appropriate operating temperature range, ensuring that it responds quickly and accurately to load changes, and realizing real-time and precise monitoring of the stamping process.

[0018] The double bellows and the airbag form a double-layer protection system. The bellows build a physical sealing barrier through expansion and contraction deformation, blocking pollutants from invading from the bottom when stamping. The airbag seals the top space after being deformed under pressure, preventing pollutants from flowing into the core area of ​​the sensor module with the gas. The two work together to reduce the amount of pollutant intrusion. During the stamping reset stage, the gas is divided into two paths. One path is discharged through the air guide cavity and the guide groove and blown to the top plate, taking away the heat of the elastomer, realizing passive cooling, and reducing the impact of temperature on the sensor accuracy. The other path is discharged from the air guide hole to form a positive pressure air curtain, actively blowing away attached dust and oil mist, preventing pollutants from being accidentally inhaled, and realizing heat exchange of the air inside the sealed cavity through gas flow, maintaining a clean environment in the cavity, and ensuring stable operation of the sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

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

[0021] In the figure: 1. Sensor body; 2. Bottom plate; 3. Mounting tube; 4. Airbag; 5. Bellows; 10. Sensor module; 11. Isolation cover; 12. Mounting flange; 20. Mounting slot; 21. Shell; 22. Top plate; 23. PCB board; 30. One-way valve; 31. Block; 32. Pressure plate; 33. Connecting rod; 34. Spring; 35. Adapter plate; 51. Air guide hole; 111. Contact block; 211. Positioning block; 212. Elastomer; 213. Adapter plate; 214. Slot; 311. Guide groove; 331. Air guide cavity; 332. Air inlet; 333. Exhaust port; 2121. Strain gauge. DETAILED DESCRIPTION

[0022] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall 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 is composed of a sensor module 10, an isolation cover 11 and a mounting flange 12. The isolation cover 11 is mounted on the outside of the sensor module 10, and the mounting flange 12 is mounted on the bottom of the sensor module 10. The structure also includes: Buffer cooling assembly: The buffer cooling assembly is arranged inside the isolation cover 11; Oil-proof and dust-proof component: The oil-proof and dust-proof component is arranged at the bottom of the sensor module 10 .

[0024] Furthermore, the sensor body 1 is fixedly installed in the stamping die base through the mounting flange 12. Through the setting of the isolation cover 11, on the one hand, the impact energy of the punching head can be reduced, and on the other hand, the stamping oil mist and dust can be prevented from invading the sensor module 10 through the radial gap. The sensor module 10 includes a base plate 2, a shell 21 and a top plate 22. A plurality of positioning blocks 211 are provided at the inner bottom of the shell 21. The shell 21 is fixed to the base plate 2 through the positioning blocks 211. An elastomer 212 is provided on the inner side of the shell 21. The bridge part of the elastomer 212 is bonded with a strain gauge 2121. The top plate 22 is fixed to the upper side of the elastomer 212. The bottom of the elastomer 212 is installed with an adapter plate 213. The top of the base plate 2 is installed with a PCB board 23. The inner top of the isolation cover 11 is fixed with a contact block 111.

[0025] The elastomer 212 is provided with three bridges. The multi-bridge structure can disperse the stamping load and avoid single-point stress concentration causing overload damage to the elastomer 212. Four strain gauges 2121 are attached to each bridge, which can be combined through a Wheatstone bridge circuit to improve the force measurement sensitivity and anti-interference ability. The pins of the multiple strain gauges 2121 are all welded on the adapter plate 213, and they are converted into a bridge circuit through 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 to ensure that the adapter plate 213 and the elastomer 212 deform synchronously to avoid signal distortion due to loose connection.

[0026] The top of the mounting cylinder 3 and the card slot 214 are provided with a buffer cooling assembly, the top of the mounting cylinder 3 is fixedly connected with a card block 31, the card block 31 matches the card slot 214, the card block 31 is fixed to the card slot 214 by gluing, a guide groove 311 is provided inside the card block 31, the bottom of the mounting cylinder 3 is fixedly connected with a receiving plate 35, the interior of the mounting cylinder 3 is slidably connected with a pressure plate 32, the top of the pressure plate 32 is fixedly connected with a connecting rod 33, the top of the connecting rod 33 passes through the side wall of the card block 31 and its end is fixed to the inner top wall of the isolation cover 11, the air bag 4 is fixedly installed in the receiving plate 35, the side wall of the mounting cylinder 3 near the card block 31 is provided with a one-way valve 30, the interior of the connecting rod 33 is provided with an air guide cavity 331, the side wall of the air guide cavity 331 near the bottom of the air guide cavity 331 is provided with an air inlet 332, and the air guide cavity 33 is provided with an air inlet 333. The side wall of the air guide cavity 331 at the top of the 1 is provided with an exhaust port 333. During stamping, the punch head first contacts the isolation cover 11 and gradually presses the isolation cover 11 downward, overcoming 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, and air is sucked in through the one-way valve 30. After the punch 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 enters the air guide cavity 331 through the air inlet 332 and is discharged through the exhaust port 333 and the guide groove 311. When the punch head is stamping, the air is buffered by 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.

[0027] The card slots 214 are distributed in a circular and equidistant manner around the central axis of the isolation cover 11. The airbag 4 is arranged in a ring shape. There is a gap between the inner ring side wall of the airbag 4 and the outer side wall of the shell 21, ensuring that it can deform within a certain range and at the same time ensuring that the 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 and the bottom of the mounting tube 3 are fixedly sealed and connected. When the pressure plate 32 moves downward, the pressure plate 32 first pushes the gas in the mounting tube 3 into the airbag 4, and then squeezes the airbag 4, which can effectively absorb the stamping vibration energy, avoid the impact load directly acting on the elastomer 212, and protect the sensor module 10.

[0028] It should be noted that the exhaust port 333 of the spring 34 in the initial state corresponds to the position of the guide groove 311, the inner bottom wall of the isolation cover 11 is against the bottom of the receiving plate 35, the guide groove 311 is set to be inclined downward, and its port is facing 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, and take away the heat generated by the stamping, thereby reducing the temperature of the elastomer 212 and realizing passive cooling. When the inner top wall of the isolation cover 11 is in contact with the upper surface of the 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 punch head first contacts the isolation cover 11 and gradually presses down the isolation cover 11. When the isolation cover 11 moves downward, it overcomes the elastic force of the spring 34 and drives the connecting rod 33 to move downward. The spring 34 cushions the impact load through its own elastic deformation. When the pressure plate 32 moves downward, 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 cushioning 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 utilized to further absorb the stamping vibration energy, thereby playing a cushioning role. The impact effect can prevent the impact load from directly acting on the elastic body 212, thereby protecting the sensor module 10. After the multi-level buffering of the spring 34 and the airbag 4, the residual load is transmitted to the elastic body 212 of the sensor module 10, causing the bridge structure to undergo elastic deformation. The deformation of the elastic body 212 drives the strain gauge 2121 pasted on the bridge to deform synchronously. According to the resistance strain effect, the resistance value of the strain gauge 2121 changes. Multiple strain gauges 2121 form a Wheatstone bridge circuit, which converts the resistance change into a voltage signal. After amplification and filtering by the PCB board 23, an electrical signal proportional to the stamping load is output to realize the force measurement function.

[0030] When the punch head presses down the isolation cover 11 and the pressure plate 32 compresses the airbag 4, the internal space of the mounting cylinder 3 above the pressure plate 32 increases, forming a negative pressure, and air is sucked in through the one-way valve 30. When the punch 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 enters the air guide cavity 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, and uses the flow of gas to take away the heat generated by the stamping, thereby reducing the elastic body 21. 2, achieving passive cooling, which can control the zero drift and sensitivity drift caused by temperature changes within a very small range, ensuring that the sensor outputs stable and accurate electrical signals and maintains high-precision measurement. The passive cooling system runs synchronously with the stamping process, and each stamping cycle can perform an effective heat exchange. Even in high-frequency stamping (such as dozens of times per minute or even higher frequency), it can take away the heat in time, so that the sensor remains in the appropriate operating temperature range, ensuring that it responds quickly and accurately to load changes, and realizing real-time and accurate monitoring of the stamping process.

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

[0032] The spring 34 first takes effect when the punch head contacts and presses down the isolation cover 11. As the isolation cover 11 continues to move downward, the compression of the spring 34 gradually increases, and the elastic force it generates also increases linearly, thereby converting part of the impact energy into elastic potential energy of the spring 34 and storing it. The initial buffering of the spring 34 can effectively reduce the rising rate of the impact load and prevent the sensor module 10 from instantly bearing excessive impact force. Through the buffering at this stage, the impact force transmitted to the subsequent buffering link can be initially attenuated, creating more favorable conditions for the buffering of the airbag 4. At the same time, it also has a certain damping effect on the downward movement of the isolation cover 11, slowing down its downward movement speed. Due to the injection of gas and the extrusion of the pressure plate 32, the airbag 4 will be deformed accordingly. At this time, the side wall of the airbag 4 will come into contact with the inner wall of the isolation cover 11, and its outer surface It will produce a relative movement tendency with the inner wall of the isolation cover 11, thereby generating friction. The existence of friction adds additional damping to the buffering process, making the downward movement process of the isolation cover 11 smoother and reducing the vibration caused by the impact force fluctuation. Although the buffering force generated by friction is smaller than the buffering force of the spring 34 and the airbag 4, it can effectively suppress the high-frequency vibration and rebound phenomenon in the buffering process. Through the mutual cooperation of the spring 34, the deformation of the airbag 4 and the friction between the airbag 4 and the inner wall of the isolation cover 11, a complete multi-stage buffering system is formed, which can effectively attenuate the strong impact force of the punching head, control the load transmitted to the sensor module 10 within a safe range, and make the entire buffering process more uniform, reduce the instantaneous impact on the sensor module 10, and further improve the stability and reliability of the sensor.

[0033] Example 2, refer to Figure 3-Figure 8 The oil-proof and dust-proof component includes a bellows 5 and a mounting groove 20 opened 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 and deform with the relative movement of the sensor components. It can not only adapt to the relative displacement between the isolation cover 11 and the base plate 2 during the stamping process, but also maintain good sealing performance to prevent oil and dust from invading the sensor module 10 from the bottom gap. A number of air guide holes 51 are opened 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 several air guide holes 51 are distributed equidistantly in a circular shape. When the inner bottom wall of the isolation cover 11 is in contact with 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 stamping, as the isolation cover 11 separates from the base plate 2, the bellows 5 stretches. At this time, the airbag 4 deforms and temporarily closes the space at the top of the airbag 4. At the same time, the air guide holes 51 are opened. On the one hand, negative pressure can be effectively formed to replenish 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 punch head presses down the isolation cover 11, the isolation cover 11 is separated from the base plate 2, and the bellows 5 stretches as the isolation cover 11 moves downward, the volume of the sealed cavity increases, and the internal air pressure decreases, forming a negative pressure environment. The bellows 5 is the first layer of 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 squeezed and deformed by the pressure plate 32, and its top fits tightly with the inner wall of the mounting tube 3, temporarily closing the top space of the airbag 4 to prevent pollutants from entering the core area of ​​the sensor module 10 through the gas flow. At this time, the airbag 4 can form a second barrier, and the outside air flows into the sealed cavity through the air guide hole 51 under the action of the pressure difference, quickly replenishing the gas, and reserving the gas source for passive cooling of 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, a part of the gas will be filled into the top of the airbag 4 through the gap between the airbag 4 and the isolation cover 11 and the shell 21, and discharged through the air guide cavity 331 and the guide groove 311, and blown to the top plate 22 to achieve passive cooling. The other part of the gas will be discharged through the air guide hole 51 to form a positive pressure environment, blowing away the attached dust or oil mist, avoiding pollutants from being accidentally sucked into the sensor module 10 by the negative pressure during the stamping process, and at the same time realizing 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 telescopic deformation, blocking pollutants from invading from the bottom when stamping. After the airbag 4 is deformed under pressure, it closes the top space to prevent pollutants from flowing into the core area of ​​the sensor module 10 with the gas flow. The two work together to reduce the amount of pollutant invasion and reduce the probability of failure of the sensor module 10 due to pollution. In the stamping reset stage, the gas is divided into two paths. One path is discharged through the air guide cavity 331 and the guide groove 311 and blown to the top plate 22, taking away the heat of the elastomer 212, realizing passive cooling, and reducing the influence of temperature on the sensor accuracy. The other path is discharged from the air guide hole 51 to form a positive pressure air curtain, which actively blows away the attached dust and oil mist, avoiding pollutants from being accidentally inhaled, and realizing heat exchange of the air inside the sealed cavity through gas flow, maintaining a clean environment in the cavity, and ensuring stable operation of the sensor.

[0038] It should be noted that the specific models and specifications of the 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 the 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 foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A force sensor structure, comprising a sensor body (1), wherein the sensor body (1) is composed of a sensor module (10), an isolation cover (11) and a mounting flange (12), wherein the isolation cover (11) is sleeved on the outside of the sensor module (10), and the mounting flange (12) is mounted on the bottom of the sensor module (10), characterized in that: Also includes: Buffer cooling assembly: the buffer cooling assembly is arranged inside the isolation cover (11); Oil-proof and dust-proof component: The oil-proof and dust-proof component is arranged at the bottom of the sensor module (10).

2. A force sensor structure according to claim 1, characterized in that: The sensing module (10) comprises a bottom plate (2), a shell (21) and a top plate (22); a plurality of positioning blocks (211) are provided on the inner bottom of the shell (21); the shell (21) is fixed to the bottom plate (2) via the positioning blocks (211); an elastic body (212) is provided on the inner side of the shell (21); a strain gauge (2121) is bonded to the bridge portion of the elastic body (212); the top plate (22) is fixed to the upper side of the elastic body (212); an adapter plate (213) is installed on the bottom of the elastic body (212); a PCB board (23) is installed on the top of the bottom plate (2); and a contact block (111) is fixedly installed on the inner top of the isolation cover (11).

3. A force sensor structure according to claim 2, characterized in that: The elastic body (212) is provided with three bridges, and four strain gauges (2121) are attached to each bridge. The pins of the plurality of strain gauges (2121) are all welded on 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 elastic body (212).

4. A force sensor structure according to claim 2, characterized in that: The buffer cooling assembly comprises a mounting cylinder (3) and a slot (214) provided on the top of the shell (21); a block (31) is fixedly connected to the top of the mounting cylinder (3); the block (31) matches the slot (214); the block (31) is fixed to the slot (214) by gluing; a guide groove (311) is provided inside the block (31); a receiving plate (35) is fixedly connected to the bottom of the mounting cylinder (3); a pressure plate (32) is slidably connected to the inside of 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) passes through the side wall of the block (31) and the end thereof is fixed to the inner top wall of the isolation cover (11); an air bag (4) is fixedly installed in the receiving plate (35); and a one-way valve (30) is installed on the side wall of the mounting cylinder (3) near the block (31).

5. A force sensor structure according to claim 4, characterized in that: The card slots (214) are distributed in an annular manner and are equidistant around the central axis of the isolation cover (11). The airbag (4) is arranged in an annular manner. There is a gap between the inner ring side wall of the airbag (4) and the outer side wall of the shell (21). The bottom of the receiving plate (35) is flush with the bottom wall of the bottom plate (2). The top of the airbag (4) is fixedly sealed to the bottom of the mounting tube (3).

6. The force sensor structure according to claim 4, characterized in that: An air guide cavity (331) is provided inside the connecting rod (33), an air inlet (332) is provided on a side wall of the air guide cavity (331) near the bottom of the air guide cavity (331), and an air outlet (333) is provided on a side wall of the air guide cavity (331) near the top of the air guide cavity (331).

7. A force sensor structure according to claim 6, characterized in that: When the spring (34) is in an 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 receiving plate (35), the guide groove (311) is tilted downward, and its port faces the surface of the top plate (22), and when the inner top wall of the isolation cover (11) is in contact with the upper surface of the clamping 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).

8. The force sensor structure according to claim 1, characterized in that: The sensor body (1) is fixedly mounted in the stamping die base via a mounting flange (12).

9. The force sensor structure according to claim 2, characterized in that: The oil-isolating and dust-proof component comprises a bellows (5) and a mounting groove (20) provided 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); and a plurality of air guide holes (51) are provided on the side wall of the bellows (5) near the inner top wall of the mounting groove (20).

10. The force sensor structure according to claim 9, characterized in that: The plurality of air guide holes (51) are distributed in an annular manner with equal spacing, and the air guide holes (51) are in a blocked state when the inner bottom wall of the isolation cover (11) is in contact with the bottom of the bottom plate (2).

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