Pressure sensor calibration device for automobile detection line

Abstract

The utility model discloses a pressure sensor calibration device for an automobile detection line in the field of automobile detection equipment, which is characterized in that a cross beam is horizontally arranged on a left supporting leg and a right supporting leg, a lever mechanism is movably arranged on the cross beam and comprises a lower bracket and an upper bracket, one end of the upper bracket is hinged with a pin shaft I, and the other end of the upper bracket is hinged with a pin shaft II; the other end of the upper support is hinged to a third pin shaft, the upper support is hinged to the lower support through a second pin shaft, the second pin shaft is located between the first pin shaft and the third pin shaft, one end, close to the third pin shaft, of the lower support is hinged to a fourth pin shaft, the third pin shaft is in threaded connection with a pressure adjusting screw rod, and the pressure adjusting screw rod is rotatably supported on the fourth pin shaft. The first pin shaft is in threaded connection with a testing screw rod, and the testing screw rod penetrates through the lower end of the cross beam downwards and is provided with a standard pressure sensor. The device does not need to adopt a weight for calibration, is simpler to operate, can be applied to various different automobile detection lines, and can calibrate sensors such as a weighing sensor, a pressure sensor and a tension sensor.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile testing equipment, in particular to a lever-type tension and pressure calibration mechanism. Background Art

[0002] In the prior art, pressure sensors such as weighing sensors and braking force sensors are usually used in automobile inspection lines. These pressure sensors need to have their basic values ​​calibrated to ensure the accuracy of their actual measurements.

[0003] In the Chinese patent database, there is a lever-type tension and pressure calibration mechanism, with the publication number: CN 214121495U, and the publication date: 20210903. The device includes a main calibration frame, a secondary calibration frame, a fulcrum calibration mechanism, a cantilever, a leveling mechanism and a cage. Pull head assemblies are installed on both sides of the main calibration frame. The pull head assembly is connected to one end of the cantilever, and the other end of the cantilever is connected to the cage. Leveling weights are installed on the outside of the cantilever. A fulcrum calibration mechanism is installed above the pull head assembly, and a cage is installed on the outside of the cantilever; a secondary calibration frame is installed above the support of the secondary calibration frame, the main calibration frame is installed between the secondary calibration frames, and the top of the secondary calibration frame is connected to the cantilever through a lever fulcrum; the fulcrum calibration mechanism includes a graphite copper sleeve, a fulcrum calibration seat, an optical axis and a positioning tool head. When it works, it uses the lever principle to amplify the mass of the weights and apply it to the tension and pressure sensors, thereby reducing the size of the main calibration frame and the number of weights, which is convenient for operation, highly safe, and accurately controls the force arm ratio to ensure the accuracy of calibration.

[0004] The disadvantages of the device are that the device has a complex structure, is inconvenient to install and use, and cannot be used to calibrate pressure sensors on automobile brake test benches with different spans. Utility Model Content

[0005] The purpose of the utility model is to provide a pressure sensor calibration device for an automobile test line, which has a simple structure, is convenient to test, does not require weights, and can adapt to a variety of different automobile test lines.

[0006] The purpose of the utility model is achieved as follows: a pressure sensor calibration device for an automobile inspection line, comprising a left leg and a right leg, a crossbeam being horizontally arranged on the left leg and the right leg, a lever mechanism being movably arranged on the crossbeam, the lever mechanism comprising a lower bracket and an upper bracket, one end of the upper bracket being hinged with a pin shaft 1, the other end of the upper bracket being hinged with a pin shaft 3, the upper bracket and the lower bracket being hingedly connected via a pin shaft 2, the pin shaft 2 being located between the pin shaft 1 and the pin shaft 3, an end of the lower bracket close to the pin shaft 3 being hinged with a pin shaft 4, a pressure regulating screw being threadedly connected to the pin shaft 3, the pressure regulating screw being rotatably supported on the pin shaft 4; a test screw being threadedly connected to the pin shaft 1, the test screw passing downward through the lower end of the crossbeam and a standard pressure sensor being installed.

[0007] During operation, the device is mounted and fixed at an appropriate location on an automobile inspection line using its legs. When testing pressure sensors on the line, a standard pressure sensor is pressed against the pressure sensor to be calibrated. By rotating the pressure-regulating screw, the pressure-regulating screw transmits force to the test screw via the upper bracket, which in turn transmits force to both the standard pressure sensor and the pressure sensor to be calibrated. The difference in readings and linearity between the two pressure sensors can be used to correct the base reading and linearity of the pressure sensor to be calibrated, ensuring that the displayed reading matches the actual measured value. Compared to the prior art, the present invention eliminates the need for weights when calibrating pressure sensors. The second pin separates the upper bracket into two left and right force arms, forming a lever mechanism. The pressure-regulating screw can amplify the pressure on one side of the test screw, thereby expanding the pressure testing range. Because the lever mechanism is movable on the crossbar, the device can calibrate pressure sensors at different locations. This device is simpler to operate and can be used on a variety of automobile inspection lines to calibrate load cells, pressure sensors, tension sensors, and other sensors.

[0008] Furthermore, two crossbeams are arranged in parallel, with a slit between the two crossbeams, and the test screw passes through the slit and extends under the crossbeams. This structure is convenient for installation and operation, and at the same time, the two crossbeams can provide greater bearing capacity.

[0009] Furthermore, to ensure that the lower bracket and the upper bracket have sufficient strength, the lower bracket includes two parallel lower bracket plates, which are connected via an upper connecting plate; the upper bracket includes two parallel upper bracket plates, which are connected via multiple rib plates.

[0010] To facilitate the movement and fixation of the lever mechanism, a lower connecting plate is provided below the crossbeam. The crossbeam is clamped between the upper and lower connecting plates, which are connected by bolts passing through slits. Loosening the bolts allows the lever mechanism to slide along the slits. Once in the desired position, tightening the bolts secures the lever mechanism to the crossbeam.

[0011] Furthermore, the lower connecting plate is provided with a guide hole through which the test screw passes longitudinally. Furthermore, the test screw is provided with a guide block corresponding to the guide hole. The guide hole serves to limit the test screw's position, restraining it and preventing it from deflecting. The guide block further ensures smooth rotation of the test screw and prevents damage to the corresponding thread.

[0012] To ensure the adjustable span between the two legs, the right leg is fixedly connected to a clamping mechanism that clamps onto the beam. The clamping mechanism includes a lower connector, an upper pressure plate, a connecting screw, and a locking nut. The right leg is connected to the lower connector, the lower end of the connecting screw is connected to the lower connector, the upper end of the lower connector rests on the underside of the beam, the upper pressure plate rests on the upper side of the beam, and the upper end of the connecting screw passes through the upper pressure plate and engages with the locking nut. Loosening the locking nut allows the right leg to slide along the length of the slit, adjusting the span between the left and right legs.

[0013] Furthermore, the lower end of the pressure-regulating screw passes through the fourth pin with clearance. Thrust bearings 1 and 2 are located above and below the fourth pin, respectively, and a retaining nut is mounted on the lower end of the pressure-regulating screw. This structure constrains the fourth pin between the first and second thrust bearings, allowing the pressure-regulating screw to rotate relative to the fourth pin.

[0014] Furthermore, the standard pressure sensor is an S-type pressure sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model.

[0016] Figure 2 It is the main view of the utility model.

[0017] Figure 3 for Figure 2 A magnified view of the local structure.

[0018] In the figure, 1 is the left leg, 2 is the crossbeam, 3 is the slit, 4 is the pin one, 5 is the pin two, 6 is the pressure-adjusting screw, 7 is the pin three, 8 is the upper pressure plate, 9 is the right leg, 10 is the pin four, 11 is the upper bracket plate, 12 is the lower bracket plate, 13 is the standard pressure sensor, 14 is the test screw, 15 is the rib plate, 16 is the locking nut, 17 is the connecting screw, 18 is the lower connector, 19 is the upper connecting plate, 20 is the lower connecting plate, 21 is the guide block, 22 is the thrust bearing one, 23 is the thrust bearing two, and 24 is the fixing nut. DETAILED DESCRIPTION

[0019] like Figure 1-3As shown, a pressure sensor calibration device for an automobile inspection line includes a left leg 1 and a right leg 9. A crossbeam 2 is horizontally arranged on the left leg 1 and the right leg 9. A lever mechanism is movably arranged on the crossbeam 2. The lever mechanism includes a lower bracket and an upper bracket. A pin 4 is hinged at one end of the upper bracket, and a pin 3 7 is hinged at the other end of the upper bracket. The upper bracket and the lower bracket are hingedly connected via a pin 2 5. The pin 2 5 is located between the pin 1 4 and the pin 3 7. A pin 4 10 is hinged at one end of the lower bracket near the pin 3 7. A pressure regulating screw 6 is threadedly connected to the pin 3 7. The pressure regulating screw 6 is longitudinally arranged and rotatably supported on the pin 4 10; a test screw 14 is threadedly connected to the pin 1 4. The test screw 14 passes downward through the lower end of the crossbeam 2 and is installed with a standard pressure sensor 13. The standard pressure sensor 13 is an S-type pressure sensor.

[0020] Two crossbeams 2 are arranged in parallel, with a slit 3 left between the two crossbeams 2 . The test screw 14 passes through the slit 3 and extends under the crossbeam 2 .

[0021] The lower bracket includes two parallel lower bracket plates 12 , which are connected via an upper connecting plate 19 ; the upper bracket includes two parallel upper bracket plates 11 , which are connected via a plurality of ribs 15 .

[0022] A lower connecting plate 20 is provided below the crossbeam 2. The crossbeam 2 is clamped between the upper connecting plate 19 and the lower connecting plate 20. The lower connecting plate 20 and the upper connecting plate 19 are connected by bolts passing through the slit 3. A guide hole is provided in the lower connecting plate 20, through which the test screw 14 passes longitudinally. A guide block 21 is provided on the test screw 14, corresponding to the guide hole.

[0023] The right support leg 9 is fixedly connected to the clamping mechanism, and the clamping mechanism is clamped on the beam 2; the clamping mechanism includes a lower connector 18, an upper pressure plate 8, a connecting screw 17 and a locking nut 16, the right support leg 9 is connected to the lower connector 18, the lower end of the connecting screw 17 is connected to the lower connector 18, the upper end of the lower connector 18 is abutted against the lower side of the beam 2, the upper pressure plate 8 is abutted against the upper side of the beam 2, the upper end of the connecting screw 17 passes through the upper pressure plate 8 and is engaged with the locking nut 16.

[0024] The lower end of the pressure-adjusting screw 6 passes through the pin 10 with some clearance. Thrust bearings 1 and 2, respectively, are located above and below the pin 10. A retaining nut 24 is attached to the lower end of the pressure-adjusting screw 6. This structure constrains the pin 10 between the thrust bearings 1 and 2, allowing the pressure-adjusting screw 6 to rotatably support the pin 10 relative to the pin 10.

[0025] During operation, the device is mounted and fixed at an appropriate location on the vehicle inspection line via support legs. The support legs are adjustable in span, making it suitable for use on inspection lines of varying spans. When testing pressure sensors on the inspection line, rotating the test screw 14 forces the standard pressure sensor 13 precisely over the pressure sensor to be calibrated. The pressure is adjusted by rotating the pressure-regulating screw 6, which transmits force via the upper bracket to the test screw 14. This force is then transferred to the standard pressure sensor 13 and the pressure sensor to be calibrated. The difference in readings and linearity between the two pressure sensors can be used to correct the base reading and linearity of the pressure sensor to be calibrated, ensuring that the displayed reading matches the actual measured value. This device does not require weights for calibration. Pin 2 5 separates the upper bracket into two left and right force arms, forming a lever mechanism. The pressure-regulating screw 6 amplifies the pressure on one side of the test screw 14, expanding the pressure testing range. Because the lever mechanism is movable on the crossbeam 2, the device can calibrate pressure sensors at different locations. Loosen the bolts, and the lever mechanism can slide along the slit 3. When it moves to a suitable position, tighten the bolts to fix the lever mechanism to the beam 2.

[0026] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solutions disclosed in the present invention, technicians in this field can make some substitutions and deformations of some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present invention.

Claims

1. A pressure sensor calibration device for automobile inspection lines, characterized by: It includes a left leg and a right leg, and a crossbeam is horizontally arranged on the left leg and the right leg, and a lever mechanism is movably arranged on the crossbeam, and the lever mechanism includes a lower bracket and an upper bracket, one end of the upper bracket is hinged with a pin shaft 1, and the other end of the upper bracket is hinged with a pin shaft 3, and the upper bracket and the lower bracket are hingedly connected via a pin shaft 2, and the pin shaft 2 is located between the pin shaft 1 and the pin shaft 3, and the end of the lower bracket close to the pin shaft 3 is hinged with a pin shaft 4, and a pressure-regulating screw is threadedly connected to the pin shaft 3, and the pressure-regulating screw is rotatably supported on the pin shaft 4; a test screw is threadedly connected to the pin shaft 1, and the test screw passes downward through the lower end of the crossbeam and a standard pressure sensor is installed.

2. The pressure sensor calibration device for an automobile inspection line according to claim 1, characterized in that: Two crossbeams are arranged in parallel, with a slit between the two crossbeams. The test screw passes through the slit and extends under the crossbeams.

3. The pressure sensor calibration device for an automobile inspection line according to claim 2, characterized in that: The lower bracket includes two parallel lower bracket plates, which are connected via an upper connecting plate; the upper bracket includes two parallel upper bracket plates, which are connected via a plurality of rib plates.

4. A pressure sensor calibration device for an automobile inspection line according to claim 2 or 3, characterized in that: A lower connecting plate is provided below the crossbeam, the crossbeam is clamped between the upper connecting plate and the lower connecting plate, and the lower connecting plate and the upper connecting plate are connected via bolts passing through the slit.

5. The pressure sensor calibration device for an automobile inspection line according to claim 4, characterized in that: The lower connecting plate is provided with a guide hole, and the test screw rod passes through the guide hole longitudinally.

6. The pressure sensor calibration device for an automobile inspection line according to claim 5, characterized in that: A guide block is provided on the test screw corresponding to the guide hole.

7. The pressure sensor calibration device for an automobile inspection line according to claim 4, characterized in that: The right support leg is fixedly connected to the clamping mechanism, and the clamping mechanism is clamped on the beam; the clamping mechanism includes a lower connector, an upper pressure plate, a connecting screw and a locking nut, the right support leg is connected to the lower connector, the lower end of the connecting screw is connected to the lower connector, the upper end of the lower connector is abutted against the lower side of the beam, the upper pressure plate is abutted against the upper side of the beam, and the upper end of the connecting screw passes through the upper pressure plate and is engaged with the locking nut.

8. The pressure sensor calibration device for an automobile inspection line according to claim 1, characterized in that: The lower end of the pressure regulating screw passes through the pin shaft four with a gap. Thrust bearing one and thrust bearing two are respectively provided on the upper and lower sides of the pin shaft four of the pressure regulating screw, and a fixing nut is installed at the lower end of the pressure regulating screw.

9. A pressure sensor calibration device for an automobile inspection line according to any one of claims 1, 2, 3, 5, 6, 7, and 8, characterized in that: The standard pressure sensor is an S-type pressure sensor.

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