A novel drum torque sensor nesting structure calibration device

Abstract

The application discloses a novel drum torque sensor nesting structure calibration device, which comprises a supporting drum, a drum encoder supporting device, a torque sensor protection mechanism and a torque sensor calibration mechanism, wherein the drum encoder supporting device and the torque sensor protection mechanism are respectively arranged at the left and right ends of the supporting drum, and the torque sensor calibration mechanism is arranged at the front end of the torque sensor protection mechanism.The scheme adopts a protection and calibration integrated nesting structure, and through external in-situ calibration and built-in clutch locking reset design, the sensor is quickly and accurately calibrated without disassembly while meeting the IP67 protection requirement of rain and fog conditions, effectively solves the problems of complicated calibration, poor reset accuracy and data loss of traditional equipment, and significantly improves the test efficiency and accuracy of the bench and reduces the maintenance cost.

Description

Technical Field

[0001] This invention relates to the field of vehicle performance testing equipment technology, specifically a novel calibration device for a nested structure of a drum torque sensor. Background Technology

[0002] The "Unmanned Vehicle Comprehensive Performance Testing System" (Patent No.: 201710252539.X), abbreviated as VTEHIL bench, aims to provide an unmanned vehicle comprehensive performance testing system that can test the longitudinal and lateral performance of unmanned vehicles under complex working conditions.

[0003] To address the need for modifications to the conventional drum torque sensor protection device to meet the IP67 protection rating for rain and fog conditions when testing vehicles under test, a series of contradictions arise, causing significant inconvenience to torque sensor calibration. Using a conventional structure necessitates removing the torque sensor mounting bracket and designing additional calibration components such as levers, greatly increasing the workload.

[0004] Therefore, a solution is needed. Summary of the Invention

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a novel calibration device with a nested structure for a rotary drum torque sensor, thereby solving the problems mentioned in the background section.

[0006] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: A novel calibration device for a nested structure of a rotary drum torque sensor includes a supporting rotary drum, a rotary drum encoder support device, a torque sensor protection mechanism, and a torque sensor calibration mechanism. The rotary drum encoder support device and the torque sensor protection mechanism are respectively disposed at the left and right ends of the supporting rotary drum, and the torque sensor calibration mechanism is disposed at the front end of the torque sensor protection mechanism. The torque sensor protection mechanism includes a support flange sleeve, a support bearing seat, a bearing flange cover, a torque fixing plate, a locking pin and a pulling screw, a locking pin indexing ring, a locking pin positioning safety lock spring, a torque sensor, a torque sensor mounting base, a locking pin positioning sensor, and a waterproof plug. The support flange sleeve is coaxially mounted on the right end of the support drum. The support bearing seat is wrapped around the outside of the support flange sleeve. The bearing flange cover is mounted on the right end of the support bearing seat. The torque fixing plate is mounted on the right end of the support flange sleeve. The locking pin and the pulling screw are mounted on the outside of the torque fixing plate. The locking pin indexing ring is mounted on the left end of the locking pin and the pulling screw. The locking pin positioning safety lock spring is mounted on the outside of the locking pin indexing ring. The torque sensor is mounted on the right end of the torque fixing plate. The torque sensor mounting base is wrapped around the outside of the torque sensor. The locking pin positioning sensor is mounted inside the torque sensor mounting base. The waterproof plug is installed opposite to the bearing flange cover and the torque sensor mounting base. The torque sensor calibration mechanism includes a calibration support shaft, calibration steel balls, calibration adjustment screws, a calibrator, and a calibrator mounting base. The calibration support shaft is installed at the right end of the support drum and at the front end of the torque sensor protection mechanism. The calibration steel balls are installed at the bottom of the calibration support shaft. The calibration adjustment screws are installed at the bottom of the calibration steel balls. The calibrator is installed at the bottom of the calibration adjustment screws. The calibrator mounting base is installed at the bottom of the calibrator.

[0007] Preferably, the locking pin and the actuating screw can be radially inserted between the torque fixing plate and the locking pin indexing ring. When the locking pin and the actuating screw are tightened, the torque fixing plate and the locking pin indexing ring are rigidly connected as one unit. The locking pin positioning safety lock spring normally maintains a preload force pushing the locking pin and the actuating screw back. After the locking pin and the actuating screw are loosened, the locking pin and the actuating screw are driven to retract by the locking pin positioning safety lock spring, so that the torque fixing plate and the locking pin indexing ring are automatically separated and disengaged.

[0008] Preferably, the locking pin positioning sensor is arranged at the limit stroke point where the locking pin and the toggle screw are fully retracted; when the locking pin positioning safety lock spring drives the locking pin and the toggle screw to fully retract, and the torque fixing plate and the locking pin indexing ring are completely released from rigid binding, the locking pin positioning sensor outputs a sensing signal to feedback the reset position of the structure.

[0009] Preferably, the waterproof plug seals the pre-reserved locking pin operation through hole between the bearing flange cover and the torque sensor mounting base; during calibration, the waterproof plug is removed to expose the operation channel, and after calibration, the waterproof plug is reassembled, together with the support flange sleeve and the torque sensor mounting base, to form a sealed cavity, so that the entire torque sensing cavity meets the IP67 sealing protection level under rain and fog conditions.

[0010] Preferably, the calibrator mounting base is fixedly mounted on the outer right wall of the supporting drum, and the entire torque sensor calibration mechanism is externally integrated. The calibration steel ball is located at the contact position between the calibration support shaft and the calibration adjustment screw to form a point contact transmission structure. The calibration adjustment screw is used for vertical fine adjustment of the applied force height. The standard torque output by the calibrator is sequentially loaded onto the torque fixing plate via the calibration adjustment screw, the calibration steel ball, and the calibration support shaft. In-situ calibration can be completed without disassembling the torque sensor mounting base.

[0011] Preferably, the bearing flange cover seals the bearing assembly opening at the end of the support flange sleeve, the force input end of the torque sensor is fixed to the torque fixing plate, and the fixed end of the torque sensor is rigidly clamped inside the torque sensor fixing seat, ensuring the structural stability of torque acquisition during drum operation.

[0012] (III) Beneficial Effects This invention provides a novel calibration device for a nested structure of a rotary drum torque sensor. It offers the following advantages: 1. This solution uses an externally integrated torque sensor calibration mechanism, along with a high-precision point contact transmission structure with calibration adjustment screws and calibration steel balls, to perform accurate in-situ calibration of the torque fixing plate without disassembling the torque sensor mounting base. This effectively simplifies the calibration process, shortens downtime, and improves benchtop operation efficiency and equipment utilization.

[0013] 2. This solution uses a locking pin, a moving screw, and a locking pin indexing ring to form a rigid locking structure for calibration. It also utilizes a safety spring to achieve automatic elastic reset after calibration, ensuring the stability of the calibration benchmark and preventing mechanical interference during normal equipment operation.

[0014] 3. This solution, by setting a locking pin positioning sensor inside the torque sensor mounting base, can accurately detect the locking reset status and confirm that the components are completely separated, effectively avoiding data distortion caused by the structure not being reset, and significantly improving test accuracy and reliability.

[0015] 4. This solution forms an openable and closable sealed protective cavity by combining a waterproof plug, a support flange sleeve, a bearing flange cover, and a torque sensor mounting base. It takes into account both the high-level IP67 waterproof protection capability under rain and fog conditions and the ease of operation for rapid sensor calibration, thus resolving the contradiction between the incompatibility of traditional structural protection and calibration.

[0016] 5. This solution adopts a regular and compact nested overall layout. Relying on the stable support structure of the supporting drum and the supporting bearing seat, as well as the double-end fixed installation method of the torque sensor, the equipment has strong operational stability, requires little structural modification, is compatible with the upgrade application of the existing VTEHIL test bench, and has excellent versatility and practicality. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of the overall appearance layout of the drum of the present invention; Figure 2 This is a schematic diagram of the torque sensor calibration mechanism of the present invention; Figure 3 This is a top-view perspective structural schematic diagram of the torque sensor protection mechanism of the present invention.

[0018] 1-Supporting drum; 2-Drum encoder support device; 3-Torque sensor protection mechanism; 31-Supporting flange sleeve; 32-Supporting bearing seat; 33-Bearing flange cover; 34-Torque fixing plate; 35-Locking pin and pulling screw; 36-Locking pin indexing ring; 37-Locking pin in-position safety lock spring; 38-Torque sensor; 39-Torque sensor mounting base; 310-Locking pin in-position sensor; 311-Waterproof plug; 4-Torque sensor calibration mechanism; 41-Calibration support shaft; 42-Calibration steel ball; 43-Calibration adjusting screw; 44-Calibrator; 45-Calibrator mounting base. Detailed Implementation

[0019] 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, and 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.

[0020] Please see Figure 1-3 The present invention provides a technical solution to achieve this: including a supporting drum 1, a drum encoder support device 2, a torque sensor protection mechanism 3, and a torque sensor calibration mechanism 4. The drum encoder support device 2 and the torque sensor protection mechanism 3 are respectively disposed at the left and right ends of the supporting drum 1, and the torque sensor calibration mechanism 4 is disposed at the front end of the torque sensor protection mechanism 3. The torque sensor protection mechanism 3 includes a support flange sleeve 31, a support bearing seat 32, a bearing flange cover 33, a torque fixing plate 34, a locking pin and a pulling screw 35, a locking pin indexing ring 36, a locking pin positioning safety lock spring 37, a torque sensor 38, a torque sensor mounting base 39, a locking pin positioning sensor 310, and a waterproof plug 311. The support flange sleeve 31 is coaxially mounted on the right end of the support drum 1. The support bearing seat 32 is wrapped around the outside of the support flange sleeve 31. The bearing flange cover 33 is mounted on the right end of the support bearing seat 32. The torque fixing plate 34 is mounted on the support flange sleeve 31. At the right end of the flange 31, the locking pin and the pulling screw 35 are installed on the outside of the torque fixing plate 34, the locking pin indexing ring 36 is installed on the left end of the locking pin and the pulling screw 35, the locking pin positioning safety lock spring 37 is installed on the outside of the locking pin indexing ring 36, the torque sensor 38 is installed at the right end of the torque fixing plate 34, the torque sensor mounting base 39 is installed around the outside of the torque sensor 38, the locking pin positioning sensor 310 is installed inside the torque sensor mounting base 39, and the waterproof plug 311 is installed opposite to each other between the bearing flange cover 33 and the torque sensor mounting base 39. The torque sensor calibration mechanism 4 includes a calibration support shaft 41, a calibration steel ball 42, a calibration adjustment screw 43, a calibrator 44, and a calibrator mounting base 45. The calibration support shaft 41 is installed at the right end of the support drum 1 and at the front end of the torque sensor protection mechanism 3. The calibration steel ball 42 is installed at the bottom of the calibration support shaft 41. The calibration adjustment screw 43 is installed at the bottom of the calibration steel ball 42. The calibrator 44 is installed at the bottom of the calibration adjustment screw 43. The calibrator mounting base 45 is installed at the bottom of the calibrator 44.

[0021] In detail, the locking pin and the actuating screw 35 can be radially inserted between the torque fixing plate 34 and the locking pin indexing ring 36. When the locking pin and the actuating screw 35 are tightened, the torque fixing plate 34 and the locking pin indexing ring 36 are rigidly connected as one unit. The locking pin positioning safety lock spring 37 normally maintains the preload force that pushes the locking pin and the actuating screw 35 back. After the locking pin and the actuating screw 35 are loosened, the locking pin and the actuating screw 35 are driven to retract by the locking pin positioning safety lock spring 37, so that the torque fixing plate 34 and the locking pin indexing ring 36 are automatically separated and disengaged.

[0022] The locking pin position sensor 310 is arranged at the limit stroke point corresponding to the complete retraction of the locking pin and the toggle screw 35. When the locking pin is in position, the safety lock spring 37 drives the locking pin and the toggle screw 35 to retract completely, and the torque fixing plate 34 and the locking pin indexing ring 36 are completely released from rigid binding, the locking pin position sensor 310 outputs a sensing signal to feedback the reset position of the structure.

[0023] The waterproof plug 311 seals the pre-reserved locking pin operation through hole between the bearing flange cover 33 and the torque sensor mounting base 39. During calibration, the waterproof plug 311 is removed to expose the operation channel. After calibration, the waterproof plug 311 is restored and assembled. Together with the support flange sleeve 31 and the torque sensor mounting base 39, they form a sealed cavity, so that the entire torque sensing cavity meets the IP67 sealing protection level under rain and fog conditions.

[0024] The calibrator mounting base 45 is fixedly mounted on the outer wall of the right end of the supporting drum 1. The entire torque sensor calibration mechanism 4 is externally integrated. The calibration steel ball 42 is located at the contact position between the calibration support shaft 41 and the calibration adjustment screw 43 to form a point contact transmission structure. The calibration adjustment screw 43 is used for vertical fine adjustment of the applied force height. The standard torque output by the calibrator 44 is sequentially loaded onto the torque fixing plate 34 through the calibration adjustment screw 43, the calibration steel ball 42, and the calibration support shaft 41. The in-situ calibration can be completed without disassembling the torque sensor mounting base 39.

[0025] The bearing flange cover 33 seals and plugs the bearing assembly opening at the end of the supporting flange sleeve 31. The force input end of the torque sensor 38 is fixed to the torque fixing plate 34, and the fixed end of the torque sensor 38 is rigidly clamped inside the torque sensor fixing seat 39, ensuring the structural stability of torque acquisition during drum operation.

[0026] Solution Analysis: 1. Enables in-situ calibration without disassembly, significantly simplifying the calibration process and improving operational efficiency. This innovative solution integrates the torque sensor calibration mechanism 4 externally and mounts it on the outer right wall of the supporting drum 1. The entire calibration assembly is fixed in place using the calibration instrument mounting base 45, eliminating the need to modify the main equipment structure. During calibration, the vertical force application height is finely adjusted using the calibration adjustment screw 43, forming a high-precision point contact transmission structure with the calibration steel ball 42. This completely eliminates lateral friction errors caused by threaded connections, allowing the standard torque output by the calibration instrument 44 to be precisely applied to the torque fixing plate 34 via the calibration support shaft 41. The entire calibration process requires no disassembly of the torque sensor mounting base 39, eliminating the cumbersome operations of traditional solutions that require disassembling the protective structure and adding external levers. This significantly reduces calibration downtime and effectively improves the calibration efficiency and equipment utilization of the VTEHIL test bench.

[0027] 2. Controllable rigid locking + elastic automatic reset ensures stable calibration and interference-free operation. This design incorporates a locking pin and actuating screw 35, a locking pin indexing ring 36, and a locking pin positioning safety spring 37 to form a linked clutch structure. Under calibration conditions, the locking pin and actuating screw 35 radially intersect the locking torque fixing disc 34 and the locking pin indexing ring 36, forming a rigid integrated structure. Relying on the coaxial positioning reference of the supporting flange sleeve 31, the coaxiality and stability of the calibration torque loading are ensured, eliminating calibration errors caused by calibration reference deviation. After calibration, the locking pin and actuating screw 35 are released, and the locking pin positioning safety spring 37 automatically pushes the component back using a preset preload, achieving automatic separation and disengagement of the torque fixing disc 34 and the locking pin indexing ring 36. This replaces manual separation operation, avoiding problems such as incomplete manual operation and residual component adhesion, and structurally eliminating additional mechanical constraint interference during drum operation.

[0028] 3. Configure a positioning sensing and detection structure to achieve visual verification of the reset status and ensure test accuracy. This solution places a locking pin positioning sensor 310 inside the torque sensor mounting base 39 at the limit retraction point of the locking pin and the toggle screw 35. After calibration and reset, when the locking pin positioning safety lock spring 37 drive component is fully reset and the rigid binding relationship between the torque fixing plate 34 and the locking pin indexing ring 36 is completely released, the locking pin positioning sensor 310 can automatically output a sensing signal to accurately reflect the reset status of the structure. This solves the drawbacks of traditional structures that cannot intuitively judge the reset status and are prone to operation with faults, effectively avoiding distortion of torque acquisition data caused by incomplete separation of the locking structure, and significantly improving the accuracy and reliability of vehicle performance test data.

[0029] 4. The openable and closable sealed cavity structure balances calibration convenience with IP67 high-level protection performance. This solution utilizes a waterproof plug 311, a support flange sleeve 31, a torque sensor mounting base 39, and a bearing flange cover 33 to form a fully enclosed protective cavity. During normal operation, the waterproof plug 311 seals the operating through-hole between the bearing flange cover 33 and the torque sensor mounting base 39, and the bearing flange cover 33 seals the bearing assembly opening of the support flange sleeve 31, completely preventing external rain, moisture, and dust from entering the cavity. This effectively protects internal precision components such as the torque sensor 38 and the locking pin sensor 310, meeting the IP67 protection level requirements under complex rain and fog conditions. Furthermore, the waterproof plug 311 is only temporarily removed during calibration to expose the operating channel, balancing sealing protection with the need for rapid calibration, thus resolving the core contradiction of traditional equipment waterproofing upgrades and convenient calibration.

[0030] 5. Nested integrated structure design ensures high equipment stability and strong adaptability. This design adopts an overall nested layout. The drum encoder support device 2 and the torque sensor protection mechanism 3 are respectively located at the left and right ends of the supporting drum 1, resulting in a neat and compact structural layout. The support bearing seat 32 is installed on the outside of the support flange sleeve 31, providing stable radial support for the rotating components and ensuring the rotational accuracy of the drum. The input end of the torque sensor 38 is fixedly connected to the torque fixing disk 34, and the fixed end is rigidly clamped inside the torque sensor fixing seat 39. The double-end limiting and fixing structure can effectively isolate the vibration interference of the drum operation and ensure the stability of the data collected by the torque sensor 38. The entire device is based on the original VTEHIL test bench structure, with minimal modifications and high integration. It is compatible with the upgrade of existing autonomous vehicle comprehensive performance test benches, demonstrating strong versatility and practicality.

[0031] Working principle: When calibrating the torque sensor 38, first remove the front and rear waterproof caps 311. Move the locking pin and the actuating screw 35 into the locking pin indexing ring 36 and tighten the screws to secure it. Connect the torque fixing plate 34 to the locking pin indexing ring 36 through the locking pin and the actuating screw 35. The locking pin indexing ring 36 is fixed to the support flange sleeve 31 with screws, and the support flange sleeve 31 is fixed to the support drum 1 with screws. The above operations complete the preparation work before calibration. After calibration, loosen the locking pin and the actuating screw 35. The locking pin positioning safety spring 37 separates the torque fixing plate 34 from the locking pin indexing ring 36. When the locking pin positioning sensor 310 senses a signal, it proves that the torque fixing plate 34 and the locking pin indexing ring 36 are completely separated. Reinstall the waterproof cap 311, and the calibration work is complete.

[0032] Technical effects of implementing this solution: This solution optimizes the integrated nested design of the protective and calibration structures of the drum torque sensor, and innovatively adopts an external in-situ calibration structure and a built-in clutch lock-up reset structure. It effectively solves the technical problems of cumbersome calibration procedures, poor reset accuracy, and distorted test data after the existing equipment's waterproof protection upgrade. It achieves rapid and accurate sensor calibration without disassembling the sensor's fixing structure, while perfectly adapting to the IP67 protection requirements for rain and fog conditions. It combines high operational efficiency, operational stability, and testing accuracy, significantly reducing equipment calibration and maintenance costs and improving the overall accuracy and operational efficiency of unmanned vehicle bench testing.

[0033] The present invention comprises: 1-supporting drum; 2-drum encoder support device; 3-torque sensor protection mechanism; 31-supporting flange sleeve; 32-supporting bearing seat; 33-bearing flange cover; 34-torque fixing plate; 35-locking pin and pulling screw; 36-locking pin indexing ring; 37-locking pin positioning safety lock spring; 38-torque sensor; 39-torque sensor fixing seat; 310-locking pin positioning sensor; 311-waterproof plug; 4-torque sensor calibration mechanism; 41-calibration support shaft; 42-calibration steel. 43 - Calibration adjustment screw; 44 - Calibration instrument; 45 - Calibration instrument mounting base. These components are all general standard parts or parts known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods. The problem solved by this invention is that existing drum torque sensor nested structure calibration devices, after adding a protective structure to meet the IP67 protection requirements of drum torque sensors under rain and fog conditions, require a significant amount of disassembly and assembly work, resulting in inconvenient torque sensor calibration operations and low work efficiency. This solution adopts an integrated nested structure for protection and calibration. Through external in-situ calibration and internal clutch locking reset design, it achieves rapid and accurate sensor calibration without disassembly while meeting the IP67 protection requirements under rain and fog conditions. This effectively solves the problems of cumbersome calibration, poor reset accuracy, and easy data distortion of traditional equipment, significantly improving bench testing efficiency and accuracy and reducing maintenance costs.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0035] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A novel calibration device for a nested structure of a rotary drum torque sensor, characterized in that: It includes a supporting drum (1), a drum encoder support device (2), a torque sensor protection mechanism (3) and a torque sensor calibration mechanism (4). The drum encoder support device (2) and the torque sensor protection mechanism (3) are respectively located at the left and right ends of the supporting drum (1), and the torque sensor calibration mechanism (4) is located at the front end of the torque sensor protection mechanism (3). The torque sensor protection mechanism (3) includes a support flange sleeve (31), a support bearing seat (32), a bearing flange cover (33), a torque fixing plate (34), a locking pin and a pull screw (35), a locking pin indexing ring (36), a locking pin positioning safety lock spring (37), a torque sensor (38), a torque sensor fixing seat (39), a locking pin positioning sensor (310), and a waterproof plug (311). The support flange sleeve (31) is installed on the right end of the support drum (1), the support bearing seat (32) is wrapped around the outside of the support flange sleeve (31), the bearing flange cover (33) is installed on the right end of the support bearing seat (32), and the torque fixing plate (34) is installed on the support flange sleeve (31). At the right end of 31), the locking pin and the pulling screw (35) are installed on the outside of the torque fixing plate (34), the locking pin indexing ring (36) is installed on the left end of the locking pin and the pulling screw (35), the locking pin positioning safety lock spring (37) is installed on the outside of the locking pin indexing ring (36), the torque sensor (38) is installed at the right end of the torque fixing plate (34), the torque sensor mounting base (39) is wrapped and installed on the outside of the torque sensor (38), the locking pin positioning sensor (310) is installed inside the torque sensor mounting base (39), and the waterproof plug (311) is installed opposite to each other between the bearing flange cover (33) and the torque sensor mounting base (39); The torque sensor calibration mechanism (4) includes a calibration support shaft (41), a calibration steel ball (42), a calibration adjustment screw (43), a calibrator (44), and a calibrator mounting base (45). The calibration support shaft (41) is installed at the right end of the support drum (1) and at the front end of the torque sensor protection mechanism (3). The calibration steel ball (42) is installed at the bottom of the calibration support shaft (41). The calibration adjustment screw (43) is installed at the bottom of the calibration steel ball (42). The calibrator (44) is installed at the bottom of the calibration adjustment screw (43). The calibrator mounting base (45) is installed at the bottom of the calibrator (44).

2. The novel drum torque sensor nested structure calibration device according to claim 1, characterized in that: The locking pin and the actuating screw (35) can be radially inserted between the torque fixing plate (34) and the locking pin indexing ring (36). When the locking pin and the actuating screw (35) are tightened, the torque fixing plate (34) and the locking pin indexing ring (36) are rigidly connected as one unit. The locking pin positioning safety lock spring (37) normally maintains a preload force that pushes the locking pin and the actuating screw (35) back. After the locking pin and the actuating screw (35) are loosened, the locking pin and the actuating screw (35) are driven to retract by the locking pin positioning safety lock spring (37), so that the torque fixing plate (34) and the locking pin indexing ring (36) are automatically separated and disengaged.

3. The novel drum torque sensor nested structure calibration device according to claim 2, characterized in that: The locking pin positioning sensor (310) is arranged at the limit stroke point where the locking pin and the toggle screw (35) are fully retracted. When the locking pin positioning safety lock spring (37) drives the locking pin and the toggle screw (35) to fully retract and the torque fixing plate (34) and the locking pin indexing ring (36) are completely released from rigid binding, the locking pin positioning sensor (310) outputs a sensing signal to feedback the reset position of the structure.

4. The novel drum torque sensor nested structure calibration device according to claim 3, characterized in that: The waterproof plug (311) seals the pre-reserved locking pin operation through hole between the bearing flange cover (33) and the torque sensor mounting base (39); during calibration, the waterproof plug (311) is removed to expose the operation channel. After calibration, the waterproof plug (311) is restored and assembled, together with the support flange sleeve (31) and the torque sensor mounting base (39) to form a sealed cavity, so that the entire torque sensing cavity meets the IP67 sealing protection level under rain and fog conditions.

5. A novel calibration device for a nested structure of a rotary drum torque sensor according to claim 4, characterized in that: The calibrator mounting base (45) is fixedly mounted on the outer wall of the right end of the support drum (1). The entire torque sensor calibration mechanism (4) is externally integrated. The calibration steel ball (42) is located at the contact position between the calibration support shaft (41) and the calibration adjustment screw (43) to form a point contact transmission structure. The calibration adjustment screw (43) is used to finely adjust the vertical force application height. The standard torque output by the calibrator (44) is loaded onto the torque fixing plate (34) in sequence through the calibration adjustment screw (43), the calibration steel ball (42), and the calibration support shaft (41). The in-situ calibration can be completed without disassembling the torque sensor mounting base (39).

6. The novel drum torque sensor nested structure calibration device according to claim 5, characterized in that: The bearing flange cover (33) seals the bearing assembly opening at the end of the support flange sleeve (31). The force input end of the torque sensor (38) is fixed to the torque fixing plate (34). The fixed end of the torque sensor (38) is rigidly clamped inside the torque sensor fixing seat (39) to ensure the structural stability of torque acquisition during drum operation.

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