A device for detecting optical performance of camera components

Abstract

The present invention discloses a device for detecting the optical performance of a camera component, comprising a material platform device for placing the camera component, a laser emitting device arranged below the material platform device, and a detection device arranged above the material platform device; the laser module is used to emit a laser beam to illuminate the camera component, so that the camera component outputs a light beam diagram; the laser module is driven by a first driving mechanism and the detection module is driven by a second driving mechanism to adjust the position, so that the center of the laser module is concentric with the detection center of the detection module; the detection module is used to detect the light beam diagram output by the camera component to determine the optical performance of the camera component. The present invention emits a laser beam to illuminate the camera component through the laser module, so that the camera component outputs a light beam diagram and projects it onto a projection screen, and the detection module determines the optical performance of the camera component by detecting the diagram on the projection screen, with a high degree of automation and high detection efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of optical performance detection of camera components, and in particular to a device for detecting the optical performance of camera components. Background Art

[0002] The components DOE (Diffractive Optical Elements) / Diffuser in the camera module need to be tested for optical performance before assembly. DOE and Diffuser are two camera components with similar functions, but they are used in different occasions. DOE is mainly used in 3D structured light cameras and DTOF cameras, while Diffuser is mainly used in ITOF cameras. Both DOE and Diffuser are components of high-end camera modules (3D). Among them, DOE is a diffractive optical element, which is a component that uses the diffraction phenomenon of light to split the laser in space. The surface of DOE has a microstructure designed by simulation, which can control the split laser beam to output various beam patterns; Diffuser is an optical diffuser that homogenizes the laser beam to improve the accuracy of ranging.

[0003] At present, there is basically no testing equipment for DOE / Diffuser, a component of camera module, in the market. If DOE / Diffuser is assembled into the camera module without undergoing optical performance testing, it will affect the yield of the camera module after assembly and reduce customer experience. Summary of the invention

[0004] The purpose of the present invention is to provide a device for detecting the optical properties of camera components. A laser module emits a laser beam to illuminate the camera component so that the camera component outputs a light beam pattern and projects it onto a projection screen. The detection module determines the optical properties of the camera component by detecting the pattern on the projection screen. The device has a high degree of automation and high detection efficiency.

[0005] In order to achieve the above purpose, the following technical solutions are adopted:

[0006] A device for detecting the optical performance of a camera component, comprising a material platform device for placing the camera component, a laser emitting device arranged below the material platform device, and a detection device arranged above the material platform device; the laser emitting device comprises a first driving mechanism, and a laser module driven by the first driving mechanism to adjust its position; the laser module is used to emit a laser beam to illuminate the camera component, so that the camera component outputs a light beam pattern; the detection device comprises a second driving mechanism, and a detection module driven by the second driving mechanism to adjust its position; the laser module is driven by the first driving mechanism and the detection module is driven by the second driving mechanism to adjust its position, so that the center of the laser module is concentric with the detection center of the detection module; the detection module is used to detect the light beam pattern output by the camera component, so as to judge the optical performance of the camera component.

[0007] Preferably, the laser emitting device further comprises a temperature control platform disposed at the bottom of the laser module; the temperature control platform is used to provide the temperature required by the laser module so that the laser module emits a light path that is compatible with the camera component.

[0008] Preferably, the laser emitting device also includes a calibration camera arranged on one side of the first driving mechanism; a light source is provided in front of the lens of the calibration camera, and the calibration camera and the light source are used to shoot the camera components in the material platform device to achieve alignment.

[0009] Preferably, it also includes a dot marking mechanism arranged on one side of the material platform device; the dot marking mechanism includes a rotating dot marking drive module, a dot marking lifting module arranged on the top of the rotating dot marking drive module, and a dot marking connecting rod with one end connected to the top of the dot marking lifting module; the other end of the dot marking connecting rod extends to the top of the material platform device, and a dot marking device is provided at this end, which is used to dot mark defective products.

[0010] Preferably, it also includes a manual alignment mechanism arranged on one side of the material platform device; the manual alignment mechanism includes a rotating platform, a first connecting rod, a second connecting rod, and an alignment camera; the two ends of the first connecting rod are respectively rotatably connected to the top of the rotating platform and one end of the second connecting rod; a light source is provided in front of the lens of the alignment camera, and the alignment camera and the light source are arranged on the other end of the second connecting rod.

[0011] Preferably, the material platform device includes a disc with a material hole in the middle, and a third driving mechanism for driving the disc to adjust its position; the camera component is placed at the bottom of the disc, and the disc is placed in the material hole of the disc.

[0012] Preferably, the third driving mechanism includes a disc rotation driving module for driving the disc to rotate, a first X-axis driving module for driving the disc to move linearly along the X-axis, and a first Y-axis driving module for driving the disc to move linearly along the Y-axis.

[0013] Preferably, the first driving mechanism and the second driving mechanism both include a second X-axis driving module, a second Y-axis driving module, a first Z-axis driving module, a Tx-axis driving module, a Ty-axis driving module, and a Tz-axis driving module; the second X-axis driving module, the second Y-axis driving module, and the first Z-axis driving module are respectively used to drive the laser module or the detection module to perform linear motion along the X-axis, Y-axis, and Z-axis; the Tx-axis driving module, the Ty-axis driving module, and the Tz-axis driving module are respectively used to drive the laser module or the detection module to perform rotational motion around the X-axis, Y-axis, and Z-axis.

[0014] Preferably, the detection device also includes a projection screen mechanism arranged below the detection module; the projection screen mechanism includes a projection screen, a lifting frame arranged at both ends of the projection screen and slidably connected to the projection screen, and a projection lifting module for driving the projection screen to slide and rise and fall on the lifting frame.

[0015] Preferably, the first Z-axis driving module of the second driving mechanism includes a plurality of lifting guide rods, a first screw rod, and a hand-cranked wheel drivingly connected to the first screw rod; the plurality of lifting guide rods are respectively arranged at the top of the two lifting frames, and a mounting plate is slidably sleeved on the lifting guide rods at the top of the two lifting frames; the detection module and the second X-axis driving module, the second Y-axis driving module, the Tx-axis driving module, the Ty-axis driving module, and the Tz-axis driving module of the second driving mechanism are arranged at the bottom of the mounting plate; the middle part of the mounting plate is drivingly connected to the first screw rod, and the hand-cranked wheel is used to drive the first screw rod to drive the mounting plate to slide and rise and fall along the lifting guide rod.

[0016] By adopting the above scheme, the beneficial effects of the present invention are:

[0017] The present invention uses a laser module to emit a laser beam to illuminate the camera component, so that the camera component outputs a beam pattern and projects it onto a projection screen, and the detection module determines the optical performance of the camera component by detecting the pattern on the projection screen. At the same time, the laser module is driven by a first driving mechanism and the detection module is driven by a second driving mechanism to adjust the position so that the center of the laser module (laser emission point) is concentric with the detection center of the detection module to ensure the accuracy of the detection. In addition, the present invention provides a dot marking mechanism to mark unqualified camera components, which is convenient for manual selection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A perspective view of the present invention;

[0019] Figure 2 A perspective view of the present invention omitting the frame;

[0020] Figure 3 is a three-dimensional diagram of the laser emitting device of the present invention;

[0021] Figure 4 A three-dimensional diagram of the dot marking mechanism of the present invention;

[0022] Figure 5 A three-dimensional diagram of the manual alignment mechanism of the present invention;

[0023] Figure 6 is a three-dimensional diagram of the material platform device of the present invention;

[0024] Figure 7 is a three-dimensional diagram of the detection device of the present invention;

[0025] Figure 8 is a three-dimensional diagram of the second driving mechanism and the detection module of the present invention;

[0026] Fig. 9 for Figure 8 A three-dimensional diagram omitting the first Z-axis drive module;

[0027] Fig.10 It is a schematic diagram of the structure of the present invention in use state;

[0028] The accompanying drawings illustrate:

[0029] 1—Material platform device, 2—Laser emission device,

[0030] 3—Detection device, 4—Dot marking mechanism,

[0031] 5—manual alignment mechanism, 6—material tray,

[0032] 7—machine frame, 8—inlet and outlet,

[0033] 11—disc, 12—third driving mechanism,

[0034] 21 - first driving mechanism, 22 - laser module,

[0035] 23—Temperature control platform, 24—Calibration camera,

[0036] 31 - second driving mechanism, 32 - detection module,

[0037] 33—projection screen mechanism, 34—mounting plate,

[0038] 41 - Rotary dotting drive module, 42 - Dotting lifting module,

[0039] 43 - dotting connecting rod, 44 - dotting device,

[0040] 51 - rotating platform, 52 - first connecting rod,

[0041] 53—second link, 54—aiming at the camera,

[0042] 121—disc rotation drive module, 122—first X-axis drive module,

[0043] 123—first Y-axis drive module, 211 / 311—second X-axis drive module,

[0044] 212 / 312—Second Y-axis drive module, 213 / 313—First Z-axis drive module,

[0045] 214 / 314—Tx axis drive module, 215 / 315—Ty axis drive module,

[0046] 216 / 316—Tz axis drive module, 331—projection screen,

[0047] 332—Lifting frame, 333—Projection lifting module,

[0048] 3131—Lifting guide rod, 3132—First screw rod,

[0049] 3133—Hand crank. DETAILED DESCRIPTION

[0050] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0051] Reference Figures 1 to 10 As shown, the present invention provides an optical performance detection device for a camera component, comprising a material platform device 1 for placing the camera component, a laser emitting device 2 arranged below the material platform device 1, and a detection device 3 arranged above the material platform device 1; the laser emitting device 2 comprises a first driving mechanism 21, and a laser module 22 driven by the first driving mechanism 21 to adjust the position; the laser module 22 is used to emit a laser beam to irradiate the camera component, so that the camera component outputs a light beam pattern; the detection device 3 comprises a second driving mechanism 31, and a detection module 32 driven by the second driving mechanism 31 to adjust the position; the laser module 22 is driven by the first driving mechanism 21 and the detection module 32 is driven by the second driving mechanism 31 to adjust the position, so that the center (laser emitting point) of the laser module 22 is concentric with the detection center of the detection module 32; the detection module 32 is used to detect the light beam pattern output by the camera component to determine the optical performance of the camera component.

[0052] In a specific embodiment, the material tray 6 is a wafer tray, and multiple DOE / Diffusers are placed on the wafer tray for loading and unloading. The camera components mainly include DOE / Diffuser, but are not limited to DOE / Diffuser. The present invention also includes a frame 7, and a material inlet and outlet 8 is provided on the back of the frame 7, and the wafer tray is loaded and unloaded from the material inlet and outlet 8.

[0053] Detection device 3:

[0054] The detection device 3 further includes a projection screen mechanism 33 disposed below the detection module 32; the projection screen mechanism 33 includes a projection screen 331, two lifting frames 332 disposed at both ends of the projection screen 331 and slidably connected to the projection screen 331, and a projection lifting module 333 for driving the projection screen 331 to slide and rise on the lifting frames 332. The beam pattern output by the camera component is projected on the projection screen 331, and the detection module 32 detects the pattern on the projection screen 331.

[0055] The first Z-axis driving module 313 of the second driving mechanism 31 includes a plurality of lifting guide rods 3131, a first screw rod 3132, and a hand-cranked wheel 3133 drivingly connected to the first screw rod 3132; the plurality of lifting guide rods 3131 are respectively arranged at the top of two lifting frames 332, and a mounting plate 34 is slidably sleeved on the lifting guide rods 3131 at the top of the two lifting frames 332; the detection module 32 and the second X-axis driving module 311, the second Y-axis driving module 312, the Tx-axis driving module 314, the Ty-axis driving module 315, and the Tz-axis driving module 316 of the second driving mechanism 31 are arranged at the bottom of the mounting plate 34; the middle part of the mounting plate 34 is drivingly connected to the first screw rod 3132, and the hand-cranked wheel 3133 is used to drive the first screw rod 3132 to drive the mounting plate 34 to slide and rise and fall along the lifting guide rod 3131.

[0056] The detection module 32 includes a detection camera, which uses a camera model MV-CH080-60GM. The detection center of the detection module 32 is the field of view center of the detection camera; the projection lifting module 333 includes a lifting drive motor, and the projection screen 331 supports a maximum of 800*600mm.

[0057] Laser launch device 2:

[0058] The laser emitting device 2 also includes a temperature control platform 23 disposed at the bottom of the laser module 22; the temperature control platform 23 is used to provide the temperature required by the laser module 22 so that the laser module 22 emits an optical path that is compatible with the camera component. The laser emitting device 2 also includes a calibration camera 24 disposed on one side of the first driving mechanism 21; a light source is provided in front of the lens of the calibration camera 24, and the calibration camera 24 and the light source are used to shoot the camera component in the material platform device 1 to achieve alignment.

[0059] The calibration camera 24 is fixed on one side of the first driving mechanism 21 and is used to calibrate the center position of the DOE / Diffuser. The calibration camera 24 uses a camera model MV-CA0500-11U. The laser module 22 is set on the fixture platform. The fixture platform is powered on to light up the lamp (laser beam) on the laser module 22. The laser beam emits an optical path to illuminate the DOE / Diffuser on the wafer disk, and the DOE / Diffuser outputs various beam patterns; the laser module 22 is the transmitting part of the camera module, which is powered on by a control connection line and generates a laser beam by energizing it externally.

[0060] Since there are some differences in the laser beam generated by the laser module 22 at different temperatures, the temperature control platform 23 controls the temperature through the built-in water circuit and the external controller, and controls the temperature of the fixture platform through the heating and cooling system (water circulation system), thereby controlling the temperature required by the laser module 22 to achieve the desired effect; the temperature range controlled by the temperature control platform 23 is 10 to 60°C, and communication is performed through RS232.

[0061] The laser beam is diffracted by the DOE / Diffuser to form a pattern which is projected onto the projection screen 331 , and the top detection camera determines the optical performance of the DOE / Diffuser by detecting the pattern on the projection screen 331 .

[0062] The first driving mechanism 21 and the second driving mechanism 31 both include a second X-axis driving module 211 / 311, a second Y-axis driving module 212 / 312, a first Z-axis driving module 213 / 313, a Tx-axis driving module 214 / 314, a Ty-axis driving module 215 / 315, and a Tz-axis driving module 216 / 316; the second X-axis driving module 211 / 311, the second Y-axis driving module 212 / 312, and the first Z-axis driving module 213 / 313 are respectively used to drive the laser module 22 or the detection module 32 to perform linear motion along the X-axis, Y-axis, and Z-axis; the Tx-axis driving module 214 / 314, the Ty-axis driving module 215 / 315, and the Tz-axis driving module 216 / 316 are respectively used to drive the laser module 22 or the detection module 32 to perform rotational motion around the X-axis, Y-axis, and Z-axis.

[0063] The second X-axis drive module 211 / 311, the second Y-axis drive module 212 / 312, the Tx-axis drive module 214 / 314, the Ty-axis drive module 215 / 315, and the Tz-axis drive module 216 / 316 of the first drive mechanism 21 and the second drive mechanism 31 are all set to manual adjustment, wherein the X-axis of the first drive mechanism 21 is manually adjusted by + / -5mm, the Y-axis is manually adjusted by + / -5mm, the Z-axis is automatically adjusted by + / -10mm, the Tx-axis is manually adjusted by + / -3°, the Ty-axis is manually adjusted by + / -3°, and the Tz-axis is manually adjusted by 0-360°; the X-axis of the second drive mechanism 31 is manually adjusted by + / -5mm, the Y-axis is manually adjusted by + / -5mm, the Z-axis is automatically adjusted by + / -5mm, the Tx-axis is manually adjusted by + / -5°, the Ty-axis is manually adjusted by + / -5°, and the Tz-axis is manually adjusted by 0-360°.

[0064] The stroke of the first Z-axis driving module 213 of the first driving mechanism 21 is 25 mm. Fig.10 The height between the detection camera and the projection screen 331 is manually adjusted (hand wheel 3133) by the first Z-axis driving module 313 of the second driving mechanism 31, and the adjustment range is set to 200-500 mm; the height between the projection screen 331 and the wafer disk is automatically adjusted by the projection lifting module 333, and the adjustment range is set to 80-350 mm; the height between the wafer disk and the laser module 22 is automatically adjusted by the first Z-axis driving module 213 of the first driving mechanism 21.

[0065] Dot marking mechanism 4:

[0066] Located on one side of the material platform device 1, the dot marking mechanism 4 includes a rotating dot driving module 41, a dot lifting module 42 arranged on the top of the rotating dot driving module 41, and a dot connecting rod 43 with one end connected to the top of the dot lifting module 42; the other end of the dot connecting rod 43 extends to the top of the material platform device 1, and a dot device 44 is provided at this end.

[0067] The swing angle of the rotating dotting driving module 41 is 90+ / -10°. The rotating dotting driving module 41 includes a rotating motor and a turntable connected to the rotating motor. The dotting lifting module 42 is arranged on the top of the turntable, which includes a lifting driving motor and a plurality of lifting rods. The dotting device 44 is used to make marks, and the angle can be adjusted by + / -15°. After the DOE / Diffuser on the entire wafer disk is detected, according to the data recording results, the rotating dotting driving module 41 drives the dotting device 44 to rotate above the wafer disk, and the dotting lifting module 42 drives the lifting to mark the unqualified DOE / Diffuser.

[0068] Manual alignment mechanism 5:

[0069] Located on one side of the material platform device 1, the manual alignment mechanism 5 includes a rotating pendulum 51, a first connecting rod 52, a second connecting rod 53, and an alignment camera 54; the two ends of the first connecting rod 52 are rotatably connected to the top of the rotating pendulum 51 and one end of the second connecting rod 53 respectively; a light source is provided in front of the lens of the alignment camera 54, and the alignment camera 54 and the light source are provided on the other end of the second connecting rod 53, so as to facilitate manual search for the center position of the first test product in the material tray 6.

[0070] Since there are some deviations in the size and position of the incoming material on the wafer tray, it is necessary to determine the position of the first DOE / Diffuser by aligning the camera 54 so that the detection can be carried out

[0071] Material platform device 1:

[0072] The material platform device 1 includes a disk 11 with a material hole in the middle, and a third driving mechanism 12 for driving the disk 11 to adjust its position; the camera component is placed in the material tray 6, and the material tray 6 is placed in the material hole of the disk 11. The third driving mechanism 12 includes a disk rotation driving module 121 for driving the disk 11 to rotate, a first X-axis driving module 122 for driving the disk 11 to move linearly along the X-axis, and a first Y-axis driving module 123 for driving the disk 11 to move linearly along the Y-axis.

[0073] The first X-axis driving module 122 has a stroke of 260 mm; the first Y-axis driving module 123 has a stroke of 400 mm; the disc rotating driving module 121 has a stroke of -20 to 20°; the material hole opened in the middle of the disc 11 is circumferentially provided with vacuum adsorption for adsorbing and fixing the wafer disc; the disc rotating driving module 121 includes a rotating driving motor and a conveyor belt arranged around the outer circumference of the disc 11, and the rotating driving motor drives the conveyor belt to drive the disc 11 to rotate and adjust the angle direction; the first X-axis driving module 122 and the first Y-axis driving module 123 both include slide rails, sliders, and motors to achieve automatic adjustment.

[0074] The detection principle of the detection equipment proposed in this application is:

[0075] Before starting work, first adjust the projection screen 331 to be horizontal, then adjust the top detection module 32 to be parallel to the projection screen 331, and then adjust the positions of the bottom laser module 22 and the top detection module 32 to be concentric; after adjustment, the top detection module 32 (at this time, only the first Z-axis driving module 313 of the second driving mechanism 31 of the detection module 32 can be manually adjusted) and the bottom laser module 22 remain stationary (at this time, only the first Z-axis driving module 213 of the first driving mechanism 21 of the laser module 22 can be automatically adjusted), and the center position of the DOE / Diffuser is found through the calibration camera 24. During this alignment process, the disk 11 automatically adjusts the X, Y and rotation angle directions through the first X-axis driving module 122, the first Y-axis driving module 123, and the disk rotation driving module 121, so that the calibration camera 24 can locate the center position of the DOE / Diffuser.

[0076] After the above adjustments are completed, put the wafer tray with DOE / Diffuser into the material platform device 1, find the position of the first DOE / Diffuser on the wafer tray through the manual alignment mechanism 5, and start the inspection of the DOE / Diffuser. After the inspection is completed, the unqualified DOE / Diffuser can be marked by the dot marking mechanism 4 to facilitate manual selection.

[0077] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for detecting the optical performance of camera components, characterized in that: It includes a material platform device for placing a camera component, a laser emitting device arranged below the material platform device, and a detection device arranged above the material platform device; the laser emitting device includes a first driving mechanism, a calibration camera arranged on one side of the first driving mechanism, and a laser module driven by the first driving mechanism to adjust the position; the laser module is used to emit a laser beam to illuminate the camera component so that the camera component outputs a beam diagram; a light source is provided in front of the lens of the calibration camera, and the calibration camera and the light source are used to shoot the camera component in the material platform device to achieve alignment; the detection device includes a second driving mechanism, and a detection module driven by the second driving mechanism to adjust the position; The laser module is driven by the first driving mechanism and the detection module is driven by the second driving mechanism to adjust the position so that the center of the laser module is concentric with the detection center of the detection module; the detection module is used to detect the beam pattern output by the camera component to determine the optical performance of the camera component; It also includes a dot marking mechanism arranged on one side of the material platform device; the dot marking mechanism includes a rotating dot marking drive module, a dot marking lifting module arranged on the top of the rotating dot marking drive module, and a dot marking connecting rod with one end connected to the top of the dot marking lifting module; the other end of the dot marking connecting rod extends to the top of the material platform device, and a dot marking device is provided at this end, which is used to dot mark defective products.

2. The optical performance detection device of camera components according to claim 1, characterized in that: The laser emitting device also includes a temperature control platform arranged at the bottom of the laser module; the temperature control platform is used to provide the temperature required by the laser module so that the laser module emits an optical path that is compatible with the camera component.

3. The optical performance detection device of camera components according to claim 1, characterized in that: It also includes a manual alignment mechanism arranged on one side of the material platform device; the manual alignment mechanism includes a rotating platform, a first connecting rod, a second connecting rod, and an alignment camera; the two ends of the first connecting rod are respectively rotatably connected to the top of the rotating platform and one end of the second connecting rod; a light source is provided in front of the lens of the alignment camera, and the alignment camera and the light source are arranged on the other end of the second connecting rod.

4. The optical performance detection device of camera components according to claim 1, characterized in that: The material platform device includes a disc with a material hole in the middle, and a third driving mechanism for driving the disc to adjust its position; the camera component is placed at the bottom of the disc, and the disc is placed in the material hole of the disc.

5. The optical performance detection device of camera components according to claim 4, characterized in that: The third driving mechanism includes a disc rotation driving module for driving the disc to rotate, a first X-axis driving module for driving the disc to move linearly along the X-axis, and a first Y-axis driving module for driving the disc to move linearly along the Y-axis.

6. The optical performance detection device of camera components according to claim 1, characterized in that: The first driving mechanism and the second driving mechanism each include a second X-axis driving module, a second Y-axis driving module, a first Z-axis driving module, a Tx-axis driving module, a Ty-axis driving module, and a Tz-axis driving module; The second X-axis driving module, the second Y-axis driving module, and the first Z-axis driving module are respectively used to drive the laser module or the detection module to perform linear motion along the X-axis, Y-axis, and Z-axis; the Tx-axis driving module, the Ty-axis driving module, and the Tz-axis driving module are respectively used to drive the laser module or the detection module to perform rotational motion around the X-axis, Y-axis, and Z-axis.

7. The device for detecting optical performance of camera components according to claim 6, characterized in that: The detection device also includes a projection screen mechanism arranged below the detection module; the projection screen mechanism includes a projection screen, a lifting frame arranged at both ends of the projection screen and slidably connected to the projection screen, and a projection lifting module for driving the projection screen to slide and rise and fall on the lifting frame.

8. The device for detecting optical performance of camera components according to claim 7, characterized in that: The first Z-axis driving module of the second driving mechanism includes a plurality of lifting guide rods, a first screw rod, and a hand-cranked wheel drivingly connected to the first screw rod; the plurality of lifting guide rods are respectively arranged at the top of the two lifting frames, and a mounting plate is slidably sleeved on the lifting guide rods at the top of the two lifting frames; the detection module and the second X-axis driving module, the second Y-axis driving module, the Tx-axis driving module, the Ty-axis driving module, and the Tz-axis driving module of the second driving mechanism are arranged at the bottom of the mounting plate; the middle part of the mounting plate is drivingly connected to the first screw rod, and the hand-cranked wheel is used to drive the first screw rod to drive the mounting plate to slide and rise and fall along the lifting guide rod.

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