A spoke-type tension and compression sensor detection device

Abstract

The present invention belongs to the field of testing and calibration technology, and discloses a spoke-type tension and compression sensor detection device. Designed to address the problems of difficult sensor calibration, low accuracy, and complex operation under actual working conditions, the device comprises a structural frame, a force-applying mechanism mounted on the structural frame, and a measuring connection mechanism. The force-applying mechanism comprises a nut driven by a rocker, the nut being threadedly connected to the screw section at the top of the tension and compression shaft, and a smooth rod section at the bottom of the tension and compression shaft being connected to an expansion sleeve seat via an expansion sleeve, with matching sliders and rails provided on both sides of the expansion sleeve seat. The lower portion of the expansion sleeve seat is sequentially connected to a transmission shaft, a sensor to be tested, a connecting shaft, and a standard sensor. The present invention is capable of testing both tension and compression conditions, meeting the testing requirements of most spoke-type tension and compression sensors. Furthermore, the device has the advantages of simple structure, reliable connection, compact size, portability, and convenient operation, enabling rapid and accurate testing and being applicable to a variety of on-site working conditions.

Description

Technical Field

[0001] The invention belongs to the technical field of testing and calibration, and in particular relates to a spoke-type tension and compression sensor detection device. Background Art

[0002] Spoke-type tension and compression sensors convert force into strain using elastic elements, then output an electrical signal through a bridge circuit composed of resistance strain gauges. They are widely used in various industrial automation environments, including water conservancy and hydropower, railway transportation, aerospace, military, and petrochemical industries. Their advantages include high measurement accuracy, a wide measurement range, a long lifespan, and excellent frequency response, making them key components in various force measurement applications. While spoke-type tension and compression sensors typically exhibit good static and dynamic accuracy, they can exhibit drift over time due to environmental changes. To ensure device accuracy, calibration and verification are necessary. The calibration method for spoke-type tension and compression sensors generally involves placing the sensor under test coaxially with a reference sensor and applying pressure or tension. The measured values ​​from the sensor under test are then compared with the reference values ​​from the reference sensor using digital methods to determine a calibration curve. Comparisons between the input and output values ​​and their accuracy are then used to determine the relationship between input and output.

[0003] Current spoke-type tension and compression sensor testing devices are typically fixed structures (such as reference dynamometers). These devices are not only expensive to maintain, but also bulky, inflexible, and time-consuming to measure. These devices are unsuitable for on-site calibration in most situations, such as sensor warehousing testing and calibration. Other simple tension and compression calibration devices, while simple in structure, suffer from low measurement accuracy and can only calibrate tension or compression. Therefore, there is an urgent need to develop a simple, user-friendly spoke-type tension and compression sensor testing device that meets these application requirements. Summary of the Invention

[0004] The present invention aims to solve the relevant technical problems of the calibration of spoke-type tension and compression sensors, and provides a spoke-type tension and compression sensor detection device that can test both tension and compression conditions and can meet the detection requirements of most spoke-type tension and compression sensors; and has the characteristics of simple structure, reliable connection, small size, easy to carry, convenient operation, etc., which can realize fast and accurate detection and is suitable for a variety of on-site working conditions.

[0005] In order to solve the above technical problems, the present invention is implemented through the following technical solutions:

[0006] The present invention provides a spoke-type tension and compression sensor detection device, comprising a base plate, wherein the base plate supports an upper fixed plate via a column, the upper fixed plate is provided with a rectangular opening, a top plate is provided above the rectangular opening, and the top plate is connected to the upper fixed plate via a support plate; a circular stepped hole is provided at the center of the top plate, and a nut is installed at the circular stepped hole via a bearing, the top of the nut extends out of the top plate and is provided with a rocking wheel, and the rocking wheel can be used to drive the nut to rotate;

[0007] The nut is connected to a tension and compression shaft, which includes an upper screw rod section and a lower polished rod section, with a shaft shoulder provided between the screw rod section and the polished rod section; the screw rod section is threadedly connected to the nut, so that the rotation of the nut can be converted into linear motion of the tension and compression shaft; the polished rod section is connected to the axial hole of the expansion sleeve through an expansion sleeve, and the shaft shoulder is used to limit the expansion sleeve; the expansion sleeve can move linearly with the tension and compression shaft;

[0008] The expansion sleeve is located in the rectangular opening of the upper fixed plate. Sliders are fixed on both sides of the expansion sleeve. The two slides are respectively embedded in two slide rails. The two slide rails are respectively fixed to the two sides of the rectangular opening of the upper fixed plate through guide rail mounting plates. When the tension and pressure shaft drives the expansion sleeve to move linearly, the slides can move linearly along the slide rails synchronously.

[0009] The lower part of the expansion sleeve is connected to a transmission shaft, a sensor to be tested, a connecting shaft, and a standard sensor in sequence. The sensor to be tested and the standard sensor are both spoke-type tension and compression sensors; the transmission shaft includes an upper flange, an intermediate shaft, and a lower flange. The upper flange is fixedly connected to the expansion sleeve by annularly evenly distributed bolts, and the lower flange is fixedly connected to the sensor to be tested by annularly evenly distributed bolts; the connecting shaft includes an upper connecting column, an intermediate disc, and a lower connecting column. The upper connecting column and the lower connecting column are both cylindrical structures and are processed with external threads. The upper connecting column is threadedly connected to the center threaded hole of the sensor to be tested, and the lower connecting column is threadedly connected to the center threaded hole of the standard sensor; the standard sensor is fixedly connected to the base plate;

[0010] The nut, the bearing, the tension and compression shaft, the expansion sleeve, the axial hole of the expansion sleeve seat, the transmission shaft, the sensor to be measured, the connecting shaft, and the standard sensor are all coaxially arranged.

[0011] Furthermore, the bottom plate and the upper fixed plate are both square, and the upper ends and lower ends of the four columns are fixedly connected to the four corners of the bottom plate and the upper fixed plate respectively.

[0012] Further, the top plate is rectangular, and the support plates are vertically arranged and located at both ends of the top plate.

[0013] Further, the handwheel includes a collar provided with a circular opening. The collar is sleeved on the top of the lead nut through the circular opening and fixed to the lead nut by a setscrew. The collar is connected with a handle through a connecting member.

[0014] Further, the circular stepped hole is composed of an upper small circular hole and a lower large circular hole. The inner diameter of the lower large circular hole is in interference fit with the outer diameter of the bearing. The lead nut is installed in the bearing and passes through the upper small circular hole, and the lower part of the lead nut is limited by its own shoulder.

[0015] Further, the slider is fixedly connected with the expansion sleeve seat by a plurality of countersunk screws arranged at intervals.

[0016] Further, the guide rail mounting plate is composed of two horizontal plates and one vertical plate and has a "C" - shaped cross - section. The guide rail mounting plate inserts its opening into both sides of the rectangular opening. The horizontal plates are fixed to the upper fixing plate by bolts, and the vertical plate is connected to the slide rail by bolts.

[0017] Further, the upper flange, the intermediate shaft and the lower flange of the transmission shaft are coaxially arranged and integrally connected. The upper connecting column, the intermediate disc and the lower connecting column of the connecting shaft are coaxially arranged and integrally connected.

[0018] Further, a boss is arranged at the center position of the upper surface of the bottom plate. The boss is processed with an external thread for threaded connection with the central threaded hole of the standard sensor.

[0019] Further, the expansion sleeve seat is arranged centered on the axis of the tension and compression shaft, and the slider, the slide rail and the guide rail mounting plate are symmetrically arranged with respect to the axis of the tension and compression shaft.

[0020] The beneficial effects of the present invention are as follows:

[0021] (1) The wheel - spoke type tension and compression sensor detection device of the present invention has a simple structure, reliable connection, small size and is convenient to carry, so as to be able to adapt to various on - site detection working conditions of sensors.

[0022] (2) The wheel - spoke type tension and compression sensor detection device of the present invention has fewer parts, and most of the components are connected by bolts, which is convenient to operate, time - saving and labor - saving, and can realize the simple and rapid calibration of the tension and compression sensor.

[0023] (3) The spoke-type tension and compression sensor detection device of the present invention adopts a spiral transmission in conjunction with a slider rail to generate an upward or downward axial force, thereby being able to test both tension and pressure; and adopts a standard sensor with a measuring range of 50kN, which can meet the detection requirements of most tension and compression sensors. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a front schematic diagram of the spoke-type tension and compression sensor detection device provided by the present invention;

[0025] Figure 2 This is a schematic cross-sectional view of the front side of the spoke-type tension and compression sensor detection device provided by the present invention;

[0026] Figure 3 This is an axonometric diagram of the spoke-type tension and compression sensor detection device provided by the present invention;

[0027] Figure 4 This is a schematic structural diagram of the tension and compression axis in the spoke-type tension and compression sensor detection device provided by the present invention;

[0028] Figure 5 This is a structural schematic diagram of the connection between the slider and the slide rail in the spoke-type tension and compression sensor detection device provided by the present invention.

[0029] In the above figure: 1: base plate; 2: column; 3: upper fixing plate; 4: guide rail mounting plate; 5: slider; 6: slide rail; 7: expansion sleeve; 8: tension and compression shaft; 801: screw rod section; 802: shaft shoulder; 803: optical axis section; 9: expansion sleeve; 10: nut; 11: sensor to be measured; 12: connecting shaft; 13: transmission shaft; 14: side support plate; 15: upper support plate; 16: bearing; 17: standard sensor; 18: rocker. DETAILED DESCRIPTION

[0030] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0031] The present invention proposes a new idea for accurate and convenient measurement of a spoke-type tension and compression sensor detection device. It is designed to address the problems of difficult calibration, low accuracy, and complex operation of spoke-type tension and compression sensors under actual working conditions. It can meet the needs of integrated tension and pressure detection under actual working conditions, and has the characteristics of simple structure, convenient operation, small device size, and high measurement accuracy.

[0032] like Figures 1 to 3 As shown, the spoke-type tension and compression sensor detection device provided by the embodiment of the present invention mainly includes three parts: a structural frame, a force-applying mechanism, and a measurement connection mechanism.

[0033] The structural frame mainly includes a base plate 1, columns 2, an upper fixed plate 3, a support plate 14, and a top plate 15. The base plate 1 is a square stainless steel plate. A boss is provided at the center of the upper surface of the base plate 1. The boss is processed with an external thread and can be threadedly connected with the center threaded hole of the standard sensor 17 to achieve the fixation of the standard sensor 17. The columns 2 are stainless steel cylinders. The four columns 2 are vertically arranged at the four corners of the base plate 1, and their bottom ends are fixed to the base plate 1 by screws. The upper fixed plate 3 is a square stainless steel plate parallel to the base plate 1, and its four corners are fixed to the top of the four columns 2 by screws. A rectangular opening is provided at the center of the upper fixed plate 3, and a top plate 15 is provided directly above the rectangular opening. The top plate 15 is a rectangular stainless steel plate parallel to the upper fixed plate 3, and the two ends of the top plate 15 are connected to the upper fixed plate 3 by support plates 14. The support plates 14 are rectangular stainless steel plates. Two support plates 14 are arranged vertically and parallel to each other. The upper and lower portions of each support plate 14 are bolted to the top plate 15 and the upper fixing plate 3, respectively. A circular stepped hole is provided at the center of the top plate 15. This hole consists of a small upper hole and a larger lower hole. The diameter of the small upper hole is smaller than that of the larger lower hole. This structural frame design provides reliable support and ample space for the force-applying and connecting mechanisms.

[0034] The force-applying mechanism mainly includes a rocker wheel 18, a nut 10, a bearing 16, a tension and pressure shaft 8, an expansion sleeve seat 7, an expansion sleeve 9, a slider 5, a slide rail 6, and a guide rail mounting plate 4.

[0035] The crank 18 comprises a collar with a circular opening. The collar fits over the outer portion of the upper portion of the nut 10 through the circular opening. The collar's sidewalls are machined with threaded through-holes radially extending along the collar and fitted with jackscrews, which securely connect the collar to the nut 10. The collar is connected to a handle via a connector for easy gripping. The handle is typically positioned vertically upward and can be a rod, annular, or other form. Pushing the handle causes the connector to rotate the collar and nut 10 together, saving effort.

[0036] The bearing 16 is mounted on the outer side of the lower portion of the nut 10 to support the rotation of the nut 10. The bearing 16 and the nut 10 are mounted in the circular stepped hole of the top plate 15, wherein the outer diameter of the bearing 16 is interference fit with the inner diameter of the lower large circular hole of the circular stepped hole, so that the outer side of the bearing 16 is fixed to the top plate 15.

[0037] The nut 10 is installed in the bearing 16 and passes through the upper small circular hole of the circular step hole. The lower part of the nut 10 is clamped at the bottom of the bearing 16 by its own shoulder to limit its position.

[0038] like Figure 4As shown in the figure, the drawing press shaft 8 includes a screw rod section 801 and a smooth rod section 803 integrally connected below the screw rod section 801. A shoulder 802 is provided between the screw rod section 801 and the smooth rod section 803. The screw rod section 801 is installed in the nut 10 and is threadedly connected to the nut 10. Through the threaded connection between the screw rod section 801 and the nut 10, the rotational movement of the nut 10 is converted into the up and down linear movement of the drawing press shaft 8. The smooth rod section 803 is connected to the expansion sleeve seat 7 through an expansion sleeve 9. The shoulder 802 is used to limit the expansion sleeve seat 7.

[0039] The expansion sleeve seat 7 is a rectangular stainless steel block, which is provided with an axial hole penetrating up and down for sleeving on the outside of the smooth rod section 803 of the drawing press shaft 8; a lower part of the axial hole is provided with an expansion sleeve installation hole for installing the expansion sleeve 9. The expansion sleeve 9 is installed in the expansion sleeve installation hole at the lower part of the expansion sleeve seat 7, so as to fixedly connect the expansion sleeve seat 7 and the smooth rod section 803, enabling the expansion sleeve seat 7 to perform up and down linear movement together with the drawing press shaft 8.

[0040] As Figure 5 shown in the figure, two sliders 5 are respectively fixed on both sides of the expansion sleeve seat 7. The sliders 5 are connected to the expansion sleeve seat 7 through a plurality of countersunk screws arranged at intervals, and the surfaces of the sliders 5 are ensured to be flat. Each slider 5 is located at the middle position of the side surface of the expansion sleeve seat 7, and the extending direction of the slider 5 is parallel to the axis of the drawing press shaft 8. The expansion sleeve seat 7 and the sliders 5 pass through the rectangular opening of the upper fixing plate 3. Slide rails 6 cooperating with the sliders 5 are respectively installed on both sides of the rectangular opening of the upper fixing plate 3. The slide rails 6 have chutes facing the sliders 5, and the chutes can enable the sliders 5 to be embedded therein, thereby realizing the up and down linear sliding of the sliders 5 along the slide rails 6. The sliders 5 and the slide rails 6 are used to ensure that the linear movement track of the expansion sleeve seat 7 always proceeds along the axis of the drawing press shaft 8.

[0041] The slide rails 6 are fixed to the rectangular opening of the upper fixing plate 3 through guide rail mounting plates 4. The guide rail mounting plates 4 are "C"-shaped cross-sectional plate-like structures integrally formed by two horizontal plates and one vertical plate. The two guide rail mounting plates 4 respectively snap their openings into both sides of the rectangular opening. The horizontal plates of each guide rail mounting plate 4 are fixed to the upper fixing plate 3 through bolts, and the back plate of the slide rail 6 is connected to the vertical plate of the guide rail mounting plate 4 through bolts.

[0042] In the force applying mechanism, the collar of the handwheel 18, the nut 10, the bearing 16, the drawing press shaft 8, the expansion sleeve 9, and the axial holes of the expansion sleeve seat 7 are all coaxially arranged. The expansion sleeve seat 7 is centered with respect to the axis of the drawing press shaft 8. The sliders 5, the slide rails 6, and the guide rail mounting plates 4 are symmetrically arranged with respect to the axis of the drawing press shaft 8.

[0043] The force-applying mechanism rotates the nut 10 to make the tension and pressure shaft 8 move linearly up and down. The tension and pressure shaft 8 drives the expansion sleeve 7 to move linearly up and down stably in cooperation with the slider 5 and the slide rail 6, thereby generating pressure or tension on the measuring connection mechanism. The connection is convenient, the force transmission is reliable, and the accuracy of the measurement is ensured.

[0044] The measurement connection mechanism primarily includes a transmission shaft 13, a sensor under test 11, a connecting shaft 12, and a standard sensor 17. Both the sensor under test 11 and the standard sensor 17 are spoke-type tension and compression sensors. The transmission shaft 13, sensor under test 11, connecting shaft 12, and standard sensor 17 are connected sequentially from top to bottom and are coaxially arranged.

[0045] The transmission shaft 13 consists of a coaxially arranged and integrally connected upper flange, an intermediate shaft, and a lower flange. The upper and lower flanges are located at the upper and lower ends of the intermediate shaft, respectively. The upper flange is secured to the lower surface of the expansion sleeve 7 via annularly distributed bolts, while the lower flange is secured to the upper surface of the sensor 11 via annularly distributed bolts. The transmission shaft 13 is coaxial with the tension and compression shaft 8.

[0046] Connecting shaft 12 comprises a coaxially arranged, integrally connected upper connecting post, a middle disc, and a lower connecting post. The upper and lower connecting posts are located at the upper and lower ends of the middle disc, respectively. The upper connecting post is cylindrical and externally threaded, designed to screw into the central threaded hole of the sensor under test 11, securing the connection between the connecting shaft 12 and the sensor under test 11. The lower connecting post is cylindrical and externally threaded, designed to screw into the central threaded hole of the standard sensor 17, securing the connection between the connecting shaft 12 and the standard sensor 17.

[0047] The standard sensor 17 is connected to the boss with external threads on the upper surface of the base plate 1 through the bottom of its central threaded hole, thereby achieving the fixation of the standard sensor 17 to the base plate 1.

[0048] The measurement connection mechanism reliably connects the sensor under test 11 and the reference sensor 17, ensuring they remain coaxial and maintaining high measurement accuracy. The force-applying mechanism applies pressure or tension to the sensor under test 11 and the reference sensor 17, and then compares their output values ​​to achieve calibration.

[0049] The standard load cell 17 has a 50kN range, which meets the testing requirements of most sensors 11 under test. Connecting the output cables of the standard load cell 17 and the sensor under test 11 to the FD-3000 dual-channel dynamic and static load measuring instrument and comparing the output values ​​with the instrument enables high-precision calibration of the sensor 11 under test.

[0050] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms of specific changes without departing from the scope of protection of the invention and the claims. These all fall within the scope of protection of the present invention.

Claims

1. A spoke type tension and compression sensor detection device, characterized in that: The invention comprises a bottom plate; the bottom plate supports an upper fixing plate through a column, the upper fixing plate is provided with a rectangular opening, a top plate is provided above the rectangular opening, and the top plate is connected to the upper fixing plate through a support plate; a circular stepped hole is provided in the center of the top plate, and a nut is installed at the circular stepped hole through a bearing, the top of the nut extends out of the top plate and is provided with a rocking wheel, and the rocking wheel can be used to drive the nut to rotate; The nut is connected to a tension and compression shaft, which includes an upper screw rod section and a lower polished rod section, with a shaft shoulder provided between the screw rod section and the polished rod section; the screw rod section is threadedly connected to the nut, so that the rotation of the nut can be converted into linear motion of the tension and compression shaft; the polished rod section is connected to the axial hole of the expansion sleeve through an expansion sleeve, and the shaft shoulder is used to limit the expansion sleeve; the expansion sleeve can move linearly with the tension and compression shaft; The expansion sleeve is located in the rectangular opening of the upper fixed plate. Sliders are fixed on both sides of the expansion sleeve. The two slides are respectively embedded in two slide rails. The two slide rails are respectively fixed to the two sides of the rectangular opening of the upper fixed plate through guide rail mounting plates. When the tension and pressure shaft drives the expansion sleeve to move linearly, the slides can move linearly along the slide rails synchronously. The lower part of the expansion sleeve is connected to a transmission shaft, a sensor to be tested, a connecting shaft, and a standard sensor in sequence. The sensor to be tested and the standard sensor are both spoke-type tension and compression sensors; the transmission shaft includes an upper flange, an intermediate shaft, and a lower flange. The upper flange is fixedly connected to the expansion sleeve by annularly evenly distributed bolts, and the lower flange is fixedly connected to the sensor to be tested by annularly evenly distributed bolts; the connecting shaft includes an upper connecting column, an intermediate disc, and a lower connecting column. The upper connecting column and the lower connecting column are both cylindrical structures and are processed with external threads. The upper connecting column is threadedly connected to the center threaded hole of the sensor to be tested, and the lower connecting column is threadedly connected to the center threaded hole of the standard sensor; the standard sensor is fixedly connected to the base plate; The nut, the bearing, the tension and compression shaft, the expansion sleeve, the axial hole of the expansion sleeve seat, the transmission shaft, the sensor to be measured, the connecting shaft, and the standard sensor are all coaxially arranged.

2. A spoke type tension and compression sensor detection device according to claim 1, characterized in that: The bottom plate and the upper fixing plate are both square, and the upper ends and lower ends of the four columns are fixedly connected to the four corners of the bottom plate and the upper fixing plate respectively.

3. The spoke-type tension and compression sensor detection device according to claim 1, characterized in that: The top plate is rectangular, and the support plates are vertically arranged and located at both ends of the top plate.

4. The spoke-type tension and compression sensor detection device according to claim 1, characterized in that: The rocking wheel includes a ring with a circular opening, the ring is sleeved on the top of the nut with the circular opening, and the ring is fixed to the nut by a top screw, and the ring is connected to the handle through a connecting piece.

5. The spoke-type tension and compression sensor detection device according to claim 1, characterized in that: The circular stepped hole consists of an upper small circular hole and a lower large circular hole. The inner diameter of the lower large circular hole is interference fit with the outer diameter of the bearing. The nut is installed in the bearing and passes through the upper small circular hole. The lower part of the nut is limited by its own shoulder.

6. The spoke-type tension and compression sensor detection device according to claim 1, characterized in that: The slider is fixedly connected to the expansion sleeve seat by a plurality of countersunk screws arranged at intervals.

7. The spoke-type tension and compression sensor detection device according to claim 1, characterized in that: The guide rail mounting plate is composed of two horizontal plates and one vertical plate, and has a "C" - shaped cross - section; the guide rail mounting plate inserts into both sides of the rectangular opening with its opening, the horizontal plates are fixed to the upper fixing plate by bolts, and the vertical plate is connected to the slide rail by bolts.

8. The spoke-type tension and compression sensor detection device according to claim 1, characterized in that: The upper flange, the intermediate shaft and the lower flange of the transmission shaft are coaxially arranged and integrally connected; the upper connecting column, the intermediate disc and the lower connecting column of the connecting shaft are coaxially arranged and integrally connected.

9. The spoke-type tension and compression sensor detection device according to claim 1, characterized in that: A boss is provided at the center of the upper surface of the bottom plate, and the boss is machined with an external thread for threaded connection with the central threaded hole of the standard sensor.

10. The spoke-type tension and compression sensor detection device according to claim 1, characterized in that: The expansion sleeve seat is centered on the axis of the pull shaft, and the slider, the slide rail and the guide rail mounting plate are symmetrically arranged with respect to the axis of the pull shaft.

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