Calibration device and method for tea screening machine

Abstract

The invention relates to a tea screening machine calibration device and method.The device comprises a rack, a lifting driving mechanism, a hollow electric rotating table, a sensor fixing tool, a rotating speed sensor and a displacement sensor, the lifting driving mechanism is installed on the rack, and the lifting driving mechanism drives a sliding block to move up and down through a first motor; the hollow electric rotating table is fixedly connected with a sliding block on the lifting driving mechanism so as to move up and down along with the sliding block, the hollow electric rotating table drives the annular rotating disc to rotate through a second motor, and the sensor fixing tool is fixedly connected with the annular rotating disc on the hollow electric rotating table so as to rotate along with the annular rotating disc. The rotating speed sensor and the displacement sensor are installed on the sensor fixing tool so as to obtain rotating speed and motion amplitude data of the tea screening machine. According to the device and method, the technical indexes of the tea screening machine can be calibrated in a non-contact mode, measurement is accurate, operation is convenient and fast, efficiency is high, and repeatability is good.

Description

Technical Field

[0001] The present invention relates to the technical field of metrology and testing, and particularly relates to a calibration device and method for a tea screening machine. Background Art

[0002] A tea screening machine is a mechanical device specifically used for classifying, screening, and removing impurities from tea. It plays a key role in the tea processing process and can classify tea according to the size, shape, or weight of different teas, thereby improving the uniformity and commercial value of tea quality. A tea screening machine is a key device for measuring the content of powder and broken tea in tea by the screening method. The national standard GB / T 8311-2013 "Tea - Determination of the content of powder and broken tea" stipulates the technical parameters of the tea screening machine, including the rotation speed and the swing amplitude.

[0003] In order to ensure the accurate and reliable operation of the tea screening machine, it is necessary to calibrate the technical indicators of the rotation speed and swing amplitude of the tea screening machine. However, the existing calibration devices and methods have the following deficiencies: 1) The circle - drawing method. According to the movement trajectory of the sieve mesh or vibrating parts of the tea screening machine, a corresponding circle is drawn on the cardboard with a marker pen, and then the diameter or amplitude of the circular motion formed during the working process is calculated. Although this method has a low implementation cost, it is cumbersome to operate, has high requirements for the inspectors, and has poor measurement repeatability. 2) A vibration sensor is installed on the edge of the sieve mesh of the tea screening machine, and the vibration waveform during the working process of the tea screening machine is collected in real - time through the vibration sensor. This measurement method is a contact - type measurement, which will not only cause mechanical wear to the equipment, but also the measurement accuracy is greatly affected by the quality of the vibration sensor itself. Summary of the Invention

[0004] The purpose of the present invention is to provide a calibration device and method for a tea screening machine. The device and method can calibrate the technical indicators of the tea screening machine in a non - contact manner, with accurate measurement, convenient, efficient operation, and good repeatability.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: A calibration device for a tea screening machine, comprising a frame, a lifting drive mechanism, a hollow electric rotating table, a sensor fixing tooling, a rotation speed sensor, and a displacement sensor. The lifting drive mechanism is installed on the frame. The lifting drive mechanism drives a slider to move up and down through a first motor. The hollow electric rotating table is fixedly connected to the slider on the lifting drive mechanism to move up and down with the slider. The hollow electric rotating table drives a ring - shaped turntable to rotate through a second motor. The sensor fixing tooling is fixedly connected to the ring - shaped turntable on the hollow electric rotating table to rotate with the ring - shaped turntable. The rotation speed sensor and the displacement sensor are installed on the sensor fixing tooling to obtain the rotation speed and movement amplitude data of the tea screening machine.

[0006] Further, the rack includes a base and a vertical frame. A tea screening machine is placed on the base, and a motor mounting plate is provided at the upper part of the vertical frame. The lifting drive mechanism includes a first motor, a lead screw, a slider, and guide rails. The first motor is fixedly installed on the motor mounting plate, and its output shaft is fixedly connected downward to the vertically arranged lead screw to drive the lead screw to rotate. The guide rails are vertically fixed to the vertical frame, and the slider is in screw fit with the lead screw and simultaneously in sliding fit with the guide rails to convert the rotational motion of the lead screw into the up-and-down linear motion of the slider.

[0007] Further, the lifting drive mechanism further includes a coupling and two bearing seats. The output shaft of the first motor is fixedly connected to the upper end of the lead screw through the coupling. The two bearing seats are respectively fixedly installed on the upper and lower parts of the vertical frame, and the upper and lower parts of the lead screw are respectively rotationally connected to the vertical frame through the bearing seats.

[0008] Further, the lifting drive mechanism includes two guide rails, and the two guide rails are arranged on the vertical frame on the left and right sides of the lead screw. The slider includes a T-shaped connecting block, a screw-fitting member, and two sliding-fitting members. The T-shaped connecting block includes a vertical plate and a horizontal plate, which are integrally connected. A through hole is provided in the middle of the horizontal plate, and a second motor placement hole is provided on the front side of the horizontal plate. The screw-fitting member is fixedly connected to the middle of the rear side of the vertical plate and is in screw fit with the lead screw. The two sliding-fitting members are fixedly connected to the left and right sides of the rear side of the vertical plate and are in sliding fit with the guide rails.

[0009] Further, the hollow electric rotating table includes a second motor, a hollow mounting frame, and an annular turntable. The hollow mounting frame is fixedly connected to the lower part of the slider. The second motor is fixedly installed on the hollow mounting frame, and its output shaft drives the annular turntable to rotate through an intermediate transmission mechanism. The sensor fixing tooling is an annular sensor fixing tooling, which is coaxially arranged with the annular turntable and fixedly connected to the lower part of the annular turntable.

[0010] Further, it includes two displacement sensors. The two displacement sensors are horizontally arranged and form a 90° angle. The working ends of the two displacement sensors both face the vibrating and rotating components of the tea screening machine to simultaneously detect the movement amplitudes of the tea screening machine in two mutually perpendicular directions. The working end of the rotational speed sensor faces the rotational output component or the vibrating and rotating component of the tea screening machine to detect the rotational speed of the tea screening machine.

[0011] Further, the rotational speed sensor is a Hall sensor, an eddy current sensor, a magnetoresistive sensor, or a proximity switch sensor, and the displacement sensor is a laser sensor.

[0012] Further, it further includes a control device, which is electrically connected to the first motor, the second motor, the rotational speed sensor and the displacement sensor respectively to control the operation of the first motor and the second motor, and to obtain the rotational speed and the movement amplitude data of the tea screening machine.

[0013] The present invention also provides a calibration method for a tea screening machine based on the above device, including the following steps: S1. Place the tea screening machine on the frame and make it located at the center of the hollow position of the tea screening machine calibration device; S2. Control the lifting drive mechanism to work, and drive the slider, the hollow electric rotating table and the sensor fixing tooling downward through the first motor until the hollow electric rotating table and the sensor fixing tooling descend to a set distance from the working table surface of the tea screening machine and are located outside its rotating output component and vibrating rotating component. At this time, the rotational speed sensor and the displacement sensor are correspondingly aligned with the rotating output component or the vibrating rotating component of the tea screening machine; S3. Determine the current detection direction, control the hollow electric rotating table to work, and drive the annular turntable and the sensor fixing tooling to rotate through the second motor to make the displacement sensor at a set horizontal angle; S4. Start the tea screening machine and turn it off after working for a set time; during this process, detect the rotational speed of the tea screening machine through the rotational speed sensor, and detect the movement amplitude of the tea screening machine in the current detection direction through the displacement sensor; S5. Change the detection direction and repeat steps S3 - S4 until the detection of the movement amplitude of all the required detection directions of the tea screening machine is completed; S6. Process all the measured data to obtain the rotational speed and the gyration amplitude data of the tea screening machine, and then calculate the calibration data of the tea screening machine.

[0014] Further, in step S6, take the average value of all the measured rotational speed data to obtain the rotational speed data of the tea screening machine; synthesize the movement amplitude data of all the detection directions of the tea screening machine to obtain the gyration amplitude data of the tea screening machine; refer to the relevant standard procedures and specifications for the obtained rotational speed and gyration amplitude data of the tea screening machine, calculate the calibration data of the tea screening machine, and complete the calibration work of the tea screening machine.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a calibration device and method for a tea screening machine. The device and method do not require complex manual operations. Through the cooperation of a lifting drive mechanism and a hollow electric rotating table, the rotational speed sensor and the displacement sensor can be oriented towards the rotational output component or the vibrating rotational component of the tea screening machine in a set detection direction, so as to realize the synchronous non-contact measurement of the rotational speed and the movement amplitude of the tea screening machine during the working process of the tea screening machine, and further realize the calibration of the tea screening machine. The device and method have a high degree of automation, not only will not cause wear to the equipment, but also are convenient and efficient to operate, have high measurement accuracy, good measurement repeatability, and have strong practicability and broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the calibration device for a tea screening machine according to an embodiment of the present invention Figure 1 ; Figure 2 is a schematic structural diagram of the calibration device for a tea screening machine according to an embodiment of the present invention Figure 2 ; Figure 3 is a schematic structural diagram of the calibration device for a tea screening machine according to an embodiment of the present invention (without the base); Figure 3 (removing the base); Figure 4 is a schematic structural diagram of the T-shaped connecting block in an embodiment of the present invention; Figure 5 is a schematic structural diagram of the hollow electric rotating table in an embodiment of the present invention; Figure 6 is a schematic control principle diagram of the control device in an embodiment of the present invention; Figure 7 is a flowchart for implementing the calibration method of the tea screening machine according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0019] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0020] As shown Figures 1-3 in the figure, this embodiment provides a calibration device for a tea screening machine, which includes a frame 1, a lifting drive mechanism, a hollow electric rotating table, a sensor fixing tooling 2, a rotational speed sensor 3 and a displacement sensor 4. The lifting drive mechanism is installed on the frame 1. The lifting drive mechanism drives a slider 6 to move up and down through a first motor 5. The hollow electric rotating table is fixedly connected to the slider 6 on the lifting drive mechanism to move up and down with the slider 6. The hollow electric rotating table drives an annular turntable 8 to rotate through a second motor 7. The sensor fixing tooling 2 is fixedly connected to the annular turntable 8 on the hollow electric rotating table to rotate with the annular turntable 8. The rotational speed sensor 3 and the displacement sensor 4 are installed on the sensor fixing tooling 2 to obtain the rotational speed and movement amplitude data of the tea screening machine.

[0021] In this embodiment, the frame 1 includes a base 101 and a vertical frame 102. The tea screening machine is placed on the base 101. An electric motor mounting plate 103 is provided at the upper part of the vertical frame 102. The lifting drive mechanism includes a first motor 5, a lead screw 9, a slider 6, guide rails 10, a coupling 11 and two bearing seats 12. The first motor 5 is fixedly installed on the electric motor mounting plate 103, and its output shaft is fixedly connected to the upper end of the vertically arranged lead screw 9 through the coupling 11 to drive the lead screw 9 to rotate. The guide rails 10 are vertically fixed to the vertical frame 102. The slider 6 is in screw fit with the lead screw 9 and is also in sliding fit with the guide rails 10 to convert the rotational movement of the lead screw 9 into the up and down linear movement of the slider 6. The two bearing seats 12 are respectively fixedly installed on the upper and lower parts of the vertical frame 102. The upper and lower parts of the lead screw 9 are respectively rotatably connected to the vertical frame 102 through the bearing seats 12.

[0022] Preferably, the lifting drive mechanism includes two guide rails 10, and the two guide rails 10 are arranged on the vertical frame on the left and right sides of the lead screw 9. The slider 6 includes a T-shaped connecting block 601, a screw fitting 602 and two sliding fittings 603. As Figure 4 shown in the figure, the T-shaped connecting block 601 includes a vertical plate and a horizontal plate, which are connected as a whole. A round hole is opened in the middle of the horizontal plate to avoid contacting the sieve plate or other vibrating parts of the tea screening machine during testing. Threaded holes are opened at the four corners of the round hole for fixing the hollow electric rotating table. A second motor placement hole is opened on the front side of the horizontal plate. The screw fitting 602 is fixedly connected to the middle of the rear side of the vertical plate and is in screw fit with the lead screw 9. The two sliding fittings 603 are fixedly connected to the left and right sides of the rear side of the vertical plate and are in sliding fit with the guide rails 10.

[0023] In this embodiment, as Figure 5As shown, the hollow electric rotating table includes a second motor 7, a hollow mounting frame 13, and an annular turntable 8. The hollow mounting frame 13 is fixedly connected to the lower part of the slider 6. The second motor 7 is fixedly installed on the hollow mounting frame 13, and its output shaft drives the annular turntable 8 to rotate downward through an intermediate transmission mechanism. The hollow electric rotating table is connected to the T-shaped connecting block 601 by four bolts.

[0024] In this embodiment, the sensor fixing tooling 2 is an annular sensor fixing tooling. The annular sensor fixing tooling is coaxially arranged with the annular turntable 8 and is fixedly connected to the threaded holes in the lower part of the annular turntable 8 by bolts. A plurality of threaded holes are provided in the annular sensor fixing tooling to fixedly install the Hall speed sensor 3 and the laser displacement sensor 4 on the sensor fixing tooling 2 through threaded fasteners.

[0025] The working end of the speed sensor 3 faces the rotating output component or the vibrating rotating component of the tea screening machine to detect the speed of the tea screening machine. Among them, the speed sensor 3 can be various forms of sensors such as a Hall sensor, an eddy current sensor, a magnetoresistive sensor, or a proximity switch sensor. The rotating output component is the rotating main shaft of the tea screening machine, and the vibrating rotating component can be an eccentric block, a tray, a support rod, a turntable, or a sieve tray that vibrates and rotates in the tea screening machine. In this embodiment, the speed sensor 3 adopts a Hall sensor.

[0026] When the speed sensor adopts a Hall sensor, due to the working distance limitation of the Hall sensor (0.5 - 4 mm), it is best to use the rotating main shaft or the eccentric block as the detection target to make the Hall sensor close to the detection target. If components such as the tray and the sieve tray are detachable, the relevant components can be removed and the Hall sensor can be made close to the rotating main shaft or the eccentric block; if these components are not detachable, there is also a certain space between the workbench surface of the tea screening machine and the tray, and the Hall sensor can be made to face the rotating main shaft or the eccentric block therebetween. In this embodiment, the Hall speed sensor 3 includes a Hall sensor body and a Hall sensor fixing support. The Hall sensor body is a Hall sensor with an optical axis cylindrical structure, which is installed in the Hall sensor fixing support and can move back and forth and be fixed to adjust the position of the Hall sensor from the rotating main shaft or the eccentric block. The Hall sensor fixing support is sleeved outside the sensor. After adjusting the orientation of the Hall speed sensor, the Hall sensor fixing support is fixedly connected to the annular sensor fixing tooling through threaded fasteners. It should be noted that when the speed sensor adopts a Hall sensor, in order to cooperate with the Hall sensor to work, a small magnet needs to be attached to the rotating main shaft or the eccentric block to allow the Hall sensor to detect the magnetic field change.

[0027] If a proximity switch sensor is used as the rotational speed sensor, the limitation on the working distance is relatively small. The detection targets of the sensor can be not only the rotating main shaft and the eccentric block, but also components such as the tray, the support rod, the turntable or the sieve tray.

[0028] In this embodiment, the displacement sensor 4 is a laser sensor. The tea screening machine calibration device includes two displacement sensors 4 which are horizontally arranged and form a 90° angle. The working ends of the two displacement sensors 4 are both oriented towards the vibrating and rotating components of the tea screening machine, that is, the two laser beams emitted by the two laser displacement sensors 4 are irradiated on the vibrating and rotating components at a 90° angle to simultaneously detect the movement amplitudes of the tea screening machine in two mutually perpendicular directions. Among them, the vibrating and rotating components can be the eccentric block, the tray, the support rod, the turntable or the sieve tray that vibrates and rotates in the tea screening machine. The laser sensor can take the eccentric block as the detection target, or can take the tray, the support rod, the turntable or the sieve tray that is driven by the eccentric block to vibrate and rotate as the detection target, and can detect the movement amplitude of the tea screening machine.

[0029] In order to realize the automatic control of the device operation, such as Figure 6 As shown, the tea screening machine calibration device is further provided with a control device which is electrically connected to the first motor 5, the second motor 7, the Hall rotational speed sensor 3 and the laser displacement sensor 4 respectively to control the operation of the first motor and the second motor, and to obtain the rotational speed and movement amplitude data of the tea screening machine.

[0030] Such as Figure 7 As shown, this embodiment also provides a tea screening machine calibration method based on the above device, and its specific implementation steps are as follows.

[0031] S1. Place the tea screening machine on the frame 1 and make it located at the center of the empty position of the tea screening machine calibration device.

[0032] S2. Control the lifting drive mechanism to work, drive the slider 6, the hollow electric rotary table and the sensor fixing tooling 2 downward through the first motor 5 until the hollow electric rotary table and the sensor fixing tooling 2 descend to a set distance from the working surface of the tea screening machine and are located outside its rotary output component and vibrating and rotating component. At this time, the Hall rotational speed sensor 3 and the laser displacement sensor 4 are aligned with the rotary output component or vibrating and rotating component of the tea screening machine.

[0033] S3. Determine the current detection direction, control the hollow electric rotary table to work, drive the annular turntable 8 and the sensor fixing tooling 2 to rotate through the second motor 7, and make the laser displacement sensor 4 at a set horizontal angle.

[0034] S4. Start the tea sieve machine and turn it off after the working set time. During this process, detect the rotation speed of the tea sieve machine through the Hall rotation speed sensor 3, and detect the movement amplitude of the tea sieve machine in the current detection direction through the laser displacement sensor 4.

[0035] S5. Change the detection direction and repeat steps S3 - S4 until the detection of the movement amplitudes of the tea sieve machine in all required detection directions is completed. A program can be designed to automatically measure the vibration sieve data at 0°, 120°, and 240°.

[0036] S6. Process all the measured data to obtain the rotation speed and gyration amplitude data of the tea sieve machine, and then calculate the calibration data of the tea sieve machine. Specifically, take the average value of all the measured rotation speed data to obtain the rotation speed data of the tea sieve machine; synthesize the movement amplitude data of all detection directions of the tea sieve machine to obtain the gyration amplitude data of the tea sieve machine; refer to the relevant standard procedures and specifications, calculate the calibration data of the tea sieve machine with the obtained rotation speed and gyration amplitude data of the tea sieve machine, and complete the calibration work of the tea sieve machine.

[0037] It should be noted that in this embodiment, two laser displacement sensors 4 with a 90° included angle are set at the same time. Therefore, during one detection process, the movement amplitude data in two perpendicular directions can be detected simultaneously, so that the detection times can be reduced by multiples and the measurement efficiency can be further improved.

[0038] This method can also measure and compare the movement amplitude deviation between the edge of the eccentric block and the edge of the turntable, and compare the movement deviation of all rotational vibration positions through the laser irradiation position to examine the installation stability of the tea sieve machine.

[0039] The above is only a preferred embodiment of the present invention, and it is not a limitation of the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes. However, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A tea screening machine calibration device, characterized in that: It includes a frame, a lifting drive mechanism, a hollow electric rotating table, a sensor fixing tool, a speed sensor and a displacement sensor. The lifting drive mechanism is installed on the frame. The lifting drive mechanism drives a slider to move up and down through a first motor. The hollow electric rotating table is fixedly connected to the slider on the lifting drive mechanism to move up and down with the slider. The hollow electric rotating table drives an annular turntable to rotate through a second motor. The sensor fixing tool is fixedly connected to the annular turntable on the hollow electric rotating table to rotate with the annular turntable. The speed sensor and the displacement sensor are installed on the sensor fixing tool to obtain the speed and movement amplitude data of the tea screening machine.

2. The calibration device for a tea screening machine according to claim 1, characterized in that: The frame includes a base and a vertical frame, a tea screening machine is placed on the base, and a motor mounting plate is arranged on the upper part of the vertical frame; the lifting drive mechanism includes a first motor, a screw rod, a slider and a guide rail, the first motor is fixedly mounted on the motor mounting plate, and its output shaft is fixedly connected downwardly with the vertically arranged screw rod to drive the screw rod to rotate, the guide rail is vertically fixed to the vertical frame, the slider is spirally matched with the screw rod, and at the same time is slidably matched with the guide rail to convert the rotational motion of the screw rod into the up and down linear motion of the slider.

3. The calibration device for a tea screening machine according to claim 2, characterized in that: The lifting drive mechanism also includes a coupling and two bearing seats. The first motor output shaft is fixedly connected to the upper end of the screw rod through the coupling; the two bearing seats are fixedly installed on the upper and lower parts of the vertical frame respectively, and the upper and lower parts of the screw rod are rotationally connected to the vertical frame through the bearing seats respectively.

4. The calibration device for a tea screening machine according to claim 2, characterized in that: The lifting drive mechanism includes two guide rails, and the two guide rails are arranged on the vertical frames on the left and right sides of the screw rod; the sliding block includes a T-shaped connecting block, a spiral fitting and two sliding fittings; the T-shaped connecting block includes a vertical plate and a horizontal plate, and the vertical plate and the horizontal plate are connected as a whole, a through hole is opened in the middle of the horizontal plate, and a second motor insertion hole is opened on the front side of the horizontal plate; the spiral fitting is fixedly connected to the middle of the rear side surface of the vertical plate and spirally matched with the screw rod, and the two sliding fittings are fixedly connected to the left and right sides of the rear side surface of the vertical plate, and slidingly matched with the guide rails.

5. The calibration device for a tea screening machine according to claim 1, characterized in that: The hollow electric rotating table includes a second motor, a hollow mounting frame and an annular turntable, the hollow mounting frame is fixedly connected to the lower part of the slider, the second motor is fixedly mounted on the hollow mounting frame and its output shaft drives the annular turntable to rotate through an intermediate transmission mechanism; the sensor fixing tool is an annular sensor fixing tool, and the annular sensor fixing tool is coaxially arranged with the annular turntable and fixedly connected to the lower part of the annular turntable.

6. The calibration device for a tea screening machine according to claim 1, characterized in that: It comprises two displacement sensors, which are arranged horizontally and form an angle of 90°. The working ends of the two displacement sensors are both directed toward the vibrating rotating part of the tea screening machine to simultaneously detect the movement amplitude of the tea screening machine in two directions perpendicular to each other; the working end of the speed sensor is directed toward the rotating output part or the vibrating rotating part of the tea screening machine to detect the speed of the tea screening machine.

7. The calibration device for a tea screening machine according to claim 1, characterized in that: The rotation speed sensor is a Hall sensor, an eddy current sensor, a magnetoresistive sensor or a proximity switch sensor, and the displacement sensor is a laser sensor.

8. The calibration device for a tea screening machine according to claim 1, characterized in that: It also includes a control device, which is electrically connected to the first motor, the second motor, the speed sensor and the displacement sensor respectively to control the operation of the first motor and the second motor and obtain the speed and movement amplitude data of the tea screening machine.

9. A method for calibrating a tea screening machine based on the device according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Place the tea screening machine on the frame and locate it in the center of the hollow position of the calibration device of the tea screening machine; S2, control the lifting drive mechanism to work, drive the slider, the hollow electric rotating table, and the sensor fixing fixture to move downward through the first motor, until the hollow electric rotating table and the sensor fixing fixture are lowered to a set distance from the working table of the tea screening machine and are located outside the rotating output component and the vibrating rotating component thereof, and at this time, the speed sensor and the displacement sensor are correspondingly aligned with the rotating output component or the vibrating rotating component of the tea screening machine; S3, determine the current detection direction, control the hollow electric rotating table to work, and drive the annular turntable and the sensor fixing fixture to rotate through the second motor, so that the displacement sensor is at a set horizontal angle; S4, start the tea screening machine, and shut down the tea screening machine after working for a set time; in this process, the rotation speed of the tea screening machine is detected by the rotation speed sensor, and the movement amplitude of the tea screening machine in the current detection direction is detected by the displacement sensor; S5, change the detection direction, and repeat steps S3-S4 until the detection of the movement amplitude of all the directions to be detected of the tea screening machine is completed; S6. Process all measured data to obtain the rotation speed and gyration amplitude data of the tea screening machine, and then calculate and obtain the calibration data of the tea screening machine.

10. The tea screening machine calibration method according to claim 9, characterized in that: In step S6, the average of all the measured rotation speed data is taken to obtain the rotation speed data of the tea screening machine; the motion amplitude data of all detection directions of the tea screening machine are integrated to obtain the rotation amplitude data of the tea screening machine; The obtained rotation speed and swing amplitude data of the tea screening machine are referred to the relevant standard procedures and specifications to calculate the calibration data of the tea screening machine, thus completing the calibration work of the tea screening machine.

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