A roof separation sensor calibration instrument

Abstract

A roof separation sensor calibration instrument is used to detect whether the accuracy of the roof separation sensor meets the standard. The roof separation sensor includes a rectangular sensor body and a measuring tube vertically arranged in the middle of the sensor body, a steel wire rope is arranged in the measuring tube, and the roof separation sensor calibration instrument includes a base, a gantry and a central control computer. The gantry includes two vertical frames, the two vertical frames are arranged on both sides of the base, and each of the two vertical frames is provided with a vertical lead screw, the lower ends of the two lead screws are rotatably connected by a horizontal bar, and the horizontal bar is driven to rotate by a motor, a lifting platform is arranged between the two lead screws, a weighing sensor is arranged on the lifting platform, the head of the weighing sensor is connected to the steel wire rope of the roof separation sensor, and a fixed bracket is arranged between the bottom of the weighing sensor and the base. The calibration instrument has high calibration accuracy and efficiency, and is suitable for calibrating roof separation sensors in large quantities.

Description

Technical Field

[0001] The invention relates to the field of mining and tunnel engineering, and in particular to a roof separation sensor calibration instrument. Background Art

[0002] Calibration mainly refers to the use of standard measuring instruments to test the accuracy (precision) of the instrument used to see if it meets the standards. It is generally used for instruments with higher precision.

[0003] The roof separation sensor is connected to the optical fiber roof dynamic monitoring host outside the mine and can detect the roof separation. As mentioned by the inventor in another patent CN202010537543.2, an improved optical fiber roof separation sensor for mining is provided with an anchor claw at the tight end of the wire rope of the roof separation sensor, which is anchored in a hole deep in the coal seam. When the coal seam at the anchoring position is delaminated, the roof moves downward, and the internal transmission mechanism of the sensor is driven by the wire rope, causing the grating wavelength inside the sensor to change. The optical fiber Bragg grating demodulator reads the current wavelength value, and after demodulation, the data is transmitted through the coal mine ring network and displayed to the monitoring center. At the same time, the visualization panel pointer will follow the current delamination change and display the current delamination value.

[0004] However, most of the roof separation sensors on the market have not undergone unified factory calibration. Even if they have been calibrated, they are calibrated manually without a unified calibration standard. This leads to different accuracy of the same sensor, and even the sensor itself may have quality problems but be sold normally, which damages the reputation of the sensor manufacturer. It is even possible that the roof separation phenomenon in the coal mine cannot be detected, and no timely measures are taken, which leads to mining accidents. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a roof plate separation sensor calibrator, which improves the calibration efficiency of the roof plate separation sensor, greatly reduces the calibration time of the roof plate separation sensor, and can calibrate multiple roof plate separation sensors at the same time. The calibrator provides a unified standard for the calibration of the roof plate separation sensor, standardizes the calibration work, prevents the outflow of unqualified products, and improves product quality.

[0006] The technical solution of the present invention is as follows:

[0007] A roof separation sensor calibrator is used to detect whether the accuracy of the roof separation sensor meets the standard. The roof separation sensor includes a rectangular sensor body and a measuring tube vertically arranged in the middle of the sensor body. A steel wire rope for measuring the displacement distance is arranged in the measuring tube. It is characterized in that it includes a base, a gantry and a central control computer. The gantry includes two vertical frames, and the two vertical frames are vertically arranged on both sides of the base. A vertical lead screw is respectively arranged in the two vertical frames. The lower ends of the two lead screws are synchronously connected by a horizontal bar, and the horizontal bar is driven to rotate by a motor. A lifting platform is arranged between the two lead screws, and the lifting platform is connected to the lead screw by a lead screw nut. Furthermore, the threads on the two lead screws have the same rotation direction, and the threads on the inner sides of the lead screw nuts have the same direction. Several weighing sensors are symmetrically arranged on the front and rear sides of the lifting platform. The head of the weighing sensor is connected to the steel wire rope of the roof separation sensor, and can measure the force applied to the steel wire rope. By measuring the force applied to the steel wire rope, it can be known whether the roof separation sensor is working normally. The weighing sensor extends out the line and is connected to the central control computer, and converts the measured force applied to the steel wire rope into an electrical signal and transmits it to the central control computer. A fixed bracket is arranged directly below the weighing sensor and between the base, which is used to fix the sensor body of the roof separation sensor, so that when the lifting platform lifts the steel wire rope upward, the sensor body will not be lifted up.

[0008] As described above, a roof separation sensor calibration instrument is provided with an inverted U-shaped motor housing between the two vertical beams above the base, the opening of the motor housing is provided downward, and a plurality of fixed brackets are provided on the front and rear sides of the motor housing, respectively. Preferably, the number of the fixed brackets provided on the front and rear sides is the same and they are symmetrically distributed, and each two adjacent fixed brackets are used to fix the sensor body of a roof separation sensor, so that the calibrator can calibrate a plurality of roof separation sensors at the same time, greatly improving the calibration efficiency. The motor housing can play a dustproof role, preventing dust from affecting the precision circuit connecting the control motor, and also providing support and installation position for the fixed brackets provided on the motor housing.

[0009] Furthermore, the fixed bracket includes a longitudinal frame, a transverse frame and an oblique bracket, the longitudinal frame and the transverse frame are made of C-shaped channel steel, the longitudinal frame is vertically arranged on the motor housing, the lower end is rotatably connected to the transverse frame, the two sides of the transverse frame are provided with penetrating sliding grooves, the oblique brackets are arranged in pairs on both sides of the longitudinal frame and the sliding groove, the upper ends of the two oblique brackets are rotatably connected to the longitudinal frame, and the lower ends are connected by bolts passing through the sliding groove. The maximum angle between the longitudinal frame and the transverse frame is 90 degrees, and when the angle between the longitudinal frame and the transverse frame is 90 degrees, the lower end of the oblique bracket slides to the innermost end of the sliding groove.

[0010] Furthermore, a buffer pad is provided on the lower surface of the cross frame, and the buffer pad can increase the contact area between the cross frame and the sensor body, thereby preventing the sensor body from being damaged due to excessive tension during the test.

[0011] Furthermore, the width of the outer side of the horizontal frame is not greater than the width of the inner side of the vertical frame, so that the horizontal frame can be folded into the vertical frame, reducing space occupancy and facilitating transportation. When the horizontal frame is completely folded into the vertical frame, the lower end of the oblique bracket slides to the outermost end of the sliding groove.

[0012] Furthermore, a limit clamp is arranged above the sliding groove, and the limit clamp is arranged above the sliding groove in the cross frame. Rotating shafts are arranged on the left and right sides of the limit clamp and pass through the limit clamp, and are rotatably connected to the cross frame. The rotating shaft divides the limit clamp into an inner limit part and an outer handle part. A spring is arranged below the handle part, one end of the spring is connected to the bottom of the handle part, and the other end is connected above the sliding groove.

[0013] Furthermore, downwardly opening limit grooves are provided at the lower sides of the limit portion, and the size of the opening of the limit groove is not less than the diameter of the bolts provided between the two oblique brackets. When the angle between the longitudinal frame and the transverse frame needs to be fixed at 90 degrees, the handle of the limit clamp is pressed downward, and the limit portion tilts upward. At this time, the lower end of the moving oblique bracket slides to the innermost end of the sliding groove, which is also directly below the limit groove. At this time, the handle is released, and under the effect of paralysis, the bolts between the two oblique brackets enter the limit groove, completing the position limitation of the longitudinal frame and the transverse frame.

[0014] In the above-mentioned top plate separation sensor calibration instrument, the motor includes a stepper motor. In the entire calibration process, the motor needs to be stopped for a period of time and then restarted. The stepper motor is more suitable for use in such working conditions that require frequent stopping and braking.

[0015] Furthermore, a helical gear is provided on the output shaft, and a helical gear is also provided between the two ends of the horizontal bar. The helical gear on the output shaft is meshed with the helical gear between the two ends of the horizontal bar at an angle of 90 degrees, thereby converting the horizontal rotation of the motor output shaft into the vertical rotation of the horizontal bar.

[0016] Furthermore, the two ends of the horizontal bar are respectively provided with helical gears, and the lower ends of the two lead screws are also provided with helical gears. The helical gears at the two ends of the horizontal bar are meshed and connected with the helical gears at the lower ends of the lead screws at an angle of 90 degrees.

[0017] In the roof separation sensor calibrator as described above, a fiber optic connector extends from the interior of the roof separation sensor, and a fiber optic interface is provided on the motor housing, and the fiber optic interface can accommodate the fiber optic connector for insertion and connection.

[0018] Furthermore, the inner side of the optical fiber interface is connected to a fiber optic roof dynamic monitoring host, which modulates and demodulates the optical signal required for the roof separation sensor to work. At the same time, the fiber optic roof dynamic monitoring host is connected to the central control computer, which can modulate and demodulate the optical signal sent back by the roof separation sensor into an electrical signal and then transmit it to the central control computer for recording.

[0019] For a roof separation sensor calibrator as described above, before calibration, it is necessary to first fix the body of the roof separation sensor under a pair of fixed brackets, lock the limit clamp, connect the steel wire rope of the roof separation sensor to the weighing sensor arranged directly above, and fix a roof separation sensor on the opposite side of the fixed bracket. To ensure the accuracy of the calibration data, two groups of fixed brackets in relative positions are required to fix a roof separation sensor at the same time for measurement. The optical fiber connector of the roof separation sensor is connected to the optical fiber interface arranged on the motor housing. The measurement can be automatically started by starting the calibrator, which is safe and convenient. Moreover, because the operating conditions of the roof separation sensor are simulated, the measurement is more accurate and standardized.

[0020] The beneficial effects achieved by the present invention compared with the prior art are:

[0021] The present invention discloses a roof separation sensor calibrator, which standardizes the entire calibration process, avoids various uncertainties in manual calibration, and ensures the quality of factory products. The calibrator can calibrate multiple roof separation sensors at the same time, greatly improving the calibration efficiency, reducing the use of labor and reducing labor costs.

[0022] 1) The present invention provides a top plate separation sensor calibration instrument, which has the characteristic of accurate calibration. The calibration instrument simultaneously receives signals sent back by the weighing sensor and the top plate separation sensor, and simultaneously detects and calibrates, with sufficiently high accuracy.

[0023] 2) The roof separation sensor calibration instrument of the present invention has the characteristic of having little influence on the roof separation sensor being calibrated. The buffer pad arranged under the cross frame can fully buffer the tension on the sensor body to prevent the sensor body from being damaged.

[0024] 3) The roof separation sensor calibration instrument of the present invention is easy to use. The roof separation sensor body is fixed, the steel wire rope is fixedly connected to the weighing sensor, the roof separation sensor is connected to the calibration instrument, and the calibration work can be automatically completed by turning on the calibration instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] By reading the detailed description of the preferred embodiment below, the scheme and advantages of the present application will become clear to those skilled in the art. The accompanying drawings are only for the purpose of illustrating the preferred embodiment and are not to be considered as limiting the present invention.

[0026] In the attached picture:

[0027] Figure 1 It is a front view of a top plate separation sensor calibration instrument in Example 1;

[0028] Figure 2 It is a schematic diagram of the three-dimensional structure of the top plate separation sensor calibration instrument in Example 1;

[0029] Figure 3 This is a schematic diagram of the fixed bracket structure in Example 1;

[0030] Figure 4 This is a schematic diagram of the limiting clamp structure in Example 1;

[0031] Figure 5 This is a schematic diagram of the assembly of the lead screw, cross bar, motor and lifting platform in Example 1;

[0032] Figure 6 This is a schematic diagram of the working state of the top plate separation sensor calibration instrument in Example 1;

[0033] The components represented by the reference numerals in the figure are:

[0034] 1. Base, 11. Motor housing, 2. Gantry, 21. Vertical frame, 3. Lifting platform, 31. Weighing sensor, 4. Screw, 5. Cross bar, 6. Motor, 7. Scale, 8. Fixed bracket, 81. Vertical frame, 82. Cross frame, 821. Sliding groove, 822. Buffer pad, 83. Oblique bracket, 84. Limit clamp, 841. Limit part, 8411. Limit groove, 842. Handle, 843, Spring, 9. Top plate separation sensor, 91. Sensor body, 92. Measuring tube, 93. Wire rope. DETAILED DESCRIPTION

[0035] The exemplary embodiments of the present disclosure will be described in more detail below in conjunction with the accompanying drawings. It should be noted that these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. The present disclosure can be implemented in various forms and should not be limited by the embodiments described herein.

[0036] The directions "front and back", "left and right", etc. mentioned in the present invention are only used to express relative positional relationships and are not restricted by any specific direction reference in practical applications.

[0037] Example 1

[0038] See also Figure 1-Figure 2 , a roof separation sensor calibration instrument, used to detect whether the accuracy of the roof separation sensor 9 meets the standard, the roof separation sensor 9 includes a rectangular sensor body 91 and a measuring tube 92 vertically arranged in the middle of the sensor body 91, and a steel wire rope 93 for measuring the displacement distance is arranged in the measuring tube 92, characterized in that it includes a base 1, a gantry 2 and a central control computer, the gantry 2 includes two vertical frames 21, the two vertical frames 21 are vertically arranged on both sides of the base 1, and a vertical lead screw 4 is respectively arranged in the two vertical frames 21, and the lower ends of the two lead screws 4 are synchronously rotated and connected by a horizontal bar 5, and the horizontal bar 5 is driven to rotate by a motor 6, and a lifting platform 3 is arranged between the two lead screws 4, and the lifting platform 3 is connected to the lead screw 4 by a lead screw nut. Further, the threads on the two lead screws 4 have the same rotation direction, and the threads on the inner sides of the lead screw nuts have the same direction. Three weighing sensors 31 are symmetrically arranged on the front and rear sides of the lifting platform 3, with a total of 6 weighing sensors 31 on both sides. The head of the weighing sensor 31 is connected to the wire rope 93 of the roof separation sensor 9, and can measure the force exerted on the wire rope 93. By measuring the force of the wire rope 93, it can be known whether the roof separation sensor 9 is working normally. The weighing sensor 31 extends out the line to be connected to the central control computer, and converts the measured force of the wire rope 93 into an electrical signal and transmits it to the central control computer. A fixed bracket 8 is arranged directly below the weighing sensor 31 and between the base 1, which is used to fix the sensor body 91 of the roof separation sensor 9, so that when the lifting platform 3 lifts the wire rope 93 upward, the sensor body 91 will not be lifted up.

[0039] Furthermore, a ruler 7 is provided on one of the vertical frames 21, and through the ruler 7, the staff can directly read the stretching length and directly compare it with the data displayed by the roof separation sensor 9, so as to roughly determine whether there is a quality problem with the roof separation sensor 9.

[0040] Furthermore, the top of the weighing sensor 31 described in this embodiment is a horizontal ring, and a rope loop is provided at the end of the wire rope 93 of the top plate separation sensor 9. The rope loop passes through the ring at the top of the weighing sensor 31, and then a horizontal short rod passes through the rope loop to complete the fixation of the wire rope 93 and the weighing sensor 31. The length of the short rod is greater than the diameter of the top ring of the weighing sensor 31.

[0041] Furthermore, an inverted U-shaped motor housing 11 is provided between the two vertical beams above the base 1, and the opening of the motor housing 11 is provided downward. Six fixing brackets 8 are provided on the front and rear sides of the motor housing 11 in this embodiment, for a total of 12 fixing brackets 8. Preferably, the fixing brackets 8 provided on the front and rear sides are the same in number and are symmetrically distributed. Each adjacent two fixing brackets are used to fix the sensor body 91 of a roof separation sensor 9, so that the calibration instrument can calibrate six roof separation sensors 9 at the same time, greatly improving the calibration efficiency. The motor housing 11 can play a dustproof role, preventing dust from affecting the precision circuit connecting the control motor 6, and also providing support and installation position for the fixing brackets 8 provided on the motor housing 11.

[0042] See also Figure 3-Figure 4 The fixed bracket 8 includes a longitudinal frame 81, a transverse frame 82 and an oblique bracket 83. The longitudinal frame 81 and the transverse frame 82 are made of C-shaped channel steel. The longitudinal frame 81 is vertically arranged on the motor housing 11, and the lower end is rotatably connected with the transverse frame 82. The transverse frame 82 is provided with penetrating sliding grooves 821 on both sides. The oblique brackets 83 are arranged in pairs on both sides of the longitudinal frame 81 and the sliding groove 821. The upper ends of the two oblique brackets 83 are rotatably connected with the longitudinal frame 81, and the lower ends are connected by bolts passing through the sliding groove 821. The maximum angle between the longitudinal frame 81 and the transverse frame 82 is 90 degrees. When the angle between the longitudinal frame 81 and the transverse frame 82 is 90 degrees, the lower end of the oblique bracket 83 slides to the innermost end of the sliding groove 821.

[0043] Furthermore, a buffer pad 822 is provided on the lower surface of the cross frame 82 , and the buffer pad 822 can increase the contact area between the cross frame 82 and the sensor body 91 , thereby preventing the sensor body 91 from being damaged due to excessive tension during the test.

[0044] Furthermore, the width of the outer side of the horizontal frame 82 is not greater than the width of the inner side of the vertical frame 81, so that the horizontal frame 82 can be folded into the vertical frame 81, reducing space occupancy and facilitating transportation. When the horizontal frame 82 is completely folded into the vertical frame 81, the lower end of the inclined bracket 83 slides to the outermost end of the sliding groove 821.

[0045] Furthermore, a limit clamp 84 is provided above the sliding groove 821, and the limit clamp 84 is provided above the sliding groove 821 in the cross frame 82. The limit clamp 84 is provided with rotating shafts on the left and right sides and passes through, and is rotatably connected with the cross frame 82. The rotating shaft divides the limit clamp 84 into an inner limit portion 841 and an outer handle portion 842. A spring 843 is provided below the handle portion 842, and one end of the spring 843 is connected to the bottom of the handle portion 842, and the other end is connected above the sliding groove 821.

[0046] Furthermore, the lower sides of the limiting portion 841 are provided with limiting grooves 8411 with openings facing downwards, and the size of the openings of the limiting grooves 8411 is not less than the diameter of the bolts provided between the two oblique brackets 83. When it is necessary to fix the angle between the longitudinal frame 81 and the transverse frame 82 to 90 degrees, the handle 842 of the limiting clamp 84 is pressed downwards, and the limiting portion 841 tilts upwards. At this time, the lower end of the moving oblique bracket 83 slides to the innermost end of the sliding groove 821, which is also directly below the limiting groove 8411. At this time, the handle 842 is released, and under the action of the spring, the bolts between the two oblique brackets 83 enter the limiting groove 8411, completing the position limitation of the longitudinal frame 81 and the transverse frame 82.

[0047] See also Figure 5 , the motor 6 includes a stepper motor 6. In the entire calibration process, the motor 6 needs to be stopped for a period of time and then restarted. The stepper motor 6 is more suitable for use in such working conditions that require frequent stopping and braking.

[0048] Furthermore, a helical gear is provided on the output shaft, and a helical gear is also provided between the two ends of the horizontal bar 5. The helical gear on the output shaft is meshed with the helical gear between the two ends of the horizontal bar 5 at an angle of 90 degrees, thereby converting the horizontal rotation of the output shaft of the motor 6 into the vertical rotation of the horizontal bar 5.

[0049] Furthermore, the two ends of the horizontal bar 5 are respectively provided with helical gears, and the lower ends of the two lead screws 4 are also provided with helical gears. The helical gears at the two ends of the horizontal bar 5 are meshed and connected with the helical gears at the lower ends of the lead screws 4 at an angle of 90 degrees.

[0050] See also Figure 6 A fiber optic connector extends from the interior of the top plate separation sensor 9, and a fiber optic interface is provided on the motor housing 11, and the fiber optic interface can accommodate the fiber optic connector for insertion and connection.

[0051] Furthermore, the inner side of the optical fiber interface is connected to a fiber optic roof dynamic monitoring host, which modulates and demodulates the optical signal required for the roof separation sensor 9 to work. At the same time, the fiber optic roof dynamic monitoring host is connected to the central control computer, which can modulate and demodulate the optical signal sent back by the roof separation sensor 9 into an electrical signal and then transmit it to the central control computer for recording.

[0052] Preferably, the measuring range of the top plate separation sensor 9 calibrated in this embodiment is 500 mm.

[0053] The calibration work of the roof separation sensor calibration instrument as described above specifically includes the following steps:

[0054] 1) Flip the horizontal frame 82 of the fixed bracket 8 by 90 degrees relative to the vertical frame 81, and use the limit clamp 84 to buckle the diagonal beam;

[0055] 2) placing the sensor body 91 of the roof separation sensor 9 under the corresponding fixing bracket 8;

[0056] 3) Fixing the steel wire rope 93 of the roof separation sensor 9 on the lifting platform 3;

[0057] 4) Connecting the output connector on the roof separation sensor 9 to the central control unit of the calibration instrument;

[0058] 5) starting the calibration instrument;

[0059] 6) The motor 6 drives the horizontal bar 5 to rotate, and the horizontal bar 5 drives the lead screw 4 to rotate, so that the lifting platform 3 is lifted, and the lifting platform 3 pulls the wire rope 93 of the top plate separation sensor 9 upward;

[0060] 7) The steel wire rope 93 of the roof separation sensor 9 is pulled upward, and stops 5 times, each stop lasting 30 minutes, and the data sent back by the roof separation sensor 9 is recorded;

[0061] 8) Calculate the fitting coefficient and strain value of the data and compare them with the standard value to determine whether the quality of the top plate separation sensor 9 is qualified.

[0062] Given a set of data transmitted back by the roof separation sensor 9 through the optical fiber, that is, the wavelength of the grating inside the sensor. The distance of the lifting platform 3 measured by the roof separation sensor 9 under the standard state is the independent variable x, and the wavelength of the grating inside the sensor is the dependent variable y. A fitting straight line p(x) = a + bx is made. The fitting coefficient is set to R 2 .

[0063]

[0064] R 2 Distribution interval (0,1), R 2 The smaller the value, the worse the fit. 2 The larger the coefficient, the better the fit. The fit coefficient calculated in this embodiment is not less than 0.998, which is considered qualified.

[0065] The difference between the wavelength of the internal grating of the sensor when the lifting platform 3 is lifted to a height of 500 mm and the wavelength of the internal grating of the sensor when the lifting platform 3 is lifted to a height of 0 mm is the strain value.

[0066] The strain value is qualified if it is greater than or equal to 1.2 and less than or equal to 1.8.

[0067] The top plate separation sensor 9 that satisfies the above fitting coefficient and strain value at the same time is qualified.

[0068] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or additions, subtractions or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A roof separation sensor calibration instrument, used to detect whether the accuracy of the roof separation sensor meets the standard, the roof separation sensor comprises a rectangular sensor body and a measuring tube vertically arranged in the middle of the sensor body, the measuring tube is provided with a steel wire rope for measuring the displacement distance, characterized in that: The roof separation sensor calibrator includes a base, a gantry and a central control computer. The gantry includes two vertical frames, and the two vertical frames are vertically arranged on both sides of the base. Each of the two vertical frames is provided with a vertical lead screw. The lower ends of the two lead screws are synchronously rotated and connected by a horizontal bar, and the horizontal bar is driven to rotate by a motor. A lifting platform is provided between the two lead screws, and the lifting platform and the lead screws are connected by a lead screw nut. Several weighing sensors are symmetrically provided on the front and rear sides of the lifting platform, and the head of the weighing sensor is connected to the steel wire rope of the roof separation sensor, so that the force exerted on the steel wire rope can be measured and transmitted to the central control computer. A fixed bracket is provided between the bottom of the weighing sensor and the base for fixing the sensor body of the roof separation sensor.

2. A roof separation sensor calibration instrument according to claim 1, characterized in that: An inverted U-shaped motor housing is arranged between two vertical frames above the base, the opening of the motor housing is arranged downward, and a plurality of fixing brackets are respectively arranged on the front and rear sides of the motor housing, and every two adjacent fixing brackets are used to fix the sensor body of a top plate separation sensor.

3. A top plate separation sensor calibration instrument according to claim 2, characterized in that: The fixed bracket includes a longitudinal frame, a transverse frame and an oblique bracket, and the longitudinal frame and the transverse frame are made of C-shaped channel steel. The longitudinal frame is vertically arranged on the motor housing, and the lower end is rotatably connected to the transverse frame. Penetrating sliding grooves are arranged on both sides of the transverse frame. The oblique brackets are arranged in pairs on both sides of the longitudinal frame and the sliding groove. The upper ends of the two oblique brackets are rotatably connected to the longitudinal frame, and the lower ends are connected by bolts passing through the sliding grooves.

4. A roof separation sensor calibration instrument according to claim 3, characterized in that: The width of the outer side of the horizontal frame is not greater than the width of the inner side of the vertical frame.

5. A roof separation sensor calibration instrument according to claim 4, characterized in that: A limit clamp is arranged above the sliding groove, and the limit clamp is arranged above the sliding groove in the cross frame. Rotating shafts are arranged on the left and right sides of the limit clamp and pass through the limit clamp, and are rotatably connected with the cross frame. The rotating shaft divides the limit clamp into an inner limit part and an outer handle part. A spring is arranged below the handle part, one end of the spring is connected to the bottom of the handle part, and the other end is connected above the sliding groove.

6. A roof separation sensor calibration instrument according to claim 5, characterized in that: Limiting grooves with openings facing downwards are arranged below both sides of the limiting portion, and the size of the openings of the limiting grooves is not less than the diameter of the bolts arranged between the two oblique brackets.

7. A roof separation sensor calibration instrument according to claim 1, characterized in that: The motor comprises a stepper motor.

8. A roof separation sensor calibration instrument according to claim 7, characterized in that: A bevel gear is arranged on the output shaft of the motor, and a bevel gear is also sleeved between the two ends of the horizontal bar. The bevel gear on the output shaft is meshed and connected with the bevel gear between the two ends of the horizontal bar at an angle of 90 degrees.

9. A roof separation sensor calibration instrument according to claim 7, characterized in that: The two ends of the horizontal bar are respectively provided with helical gears, and the lower ends of the two lead screws are also provided with helical gears. The helical gears at the two ends of the horizontal bar are meshed and connected with the helical gears at the lower ends of the lead screws at an angle of 90 degrees.

10. A roof separation sensor calibration instrument according to claim 2, characterized in that: An optical fiber connector extends from the interior of the top plate separation sensor, and an optical fiber interface is provided on the motor housing, and the optical fiber interface can accommodate the optical fiber connector for insertion and connection.

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