Device capable of realizing multi-angle real shooting

Abstract

The utility model belongs to the technical field of cameras, and particularly relates to a device capable of realizing multi-angle real shooting, which comprises a loading platform, a lifting mechanism, an RZ-axis turntable mechanism, an RY-axis turntable mechanism, a substrate and a jig for fixing a camera module, the fixed end of the RZ-axis rotary table mechanism is arranged at the movable end of the lifting mechanism, the base plate is arranged at the rotating end of the RZ-axis rotary table mechanism, the fixed end of the RY-axis rotary table mechanism is arranged on the base plate, and the jig is arranged at the rotating end of the RY-axis rotary table mechanism. According to the utility model, the lifting mechanism can drive the camera module to move up and down so as to be aligned with the center of a chart, and the RZ-axis turntable mechanism and the RY-axis turntable mechanism can drive the camera module to rotate up, down, left and right angles and test the camera module at an accurate position, so that the consistency of test conditions is ensured, and the accuracy and reliability of test results are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to camera technical field, concretely relates to a device of can realize multi -angle real -shot. BACKGROUND

[0002] At present, part module product needs to rotate 90 degrees to shoot TV Line Chart graph in 10m to verify whether resolution satisfies design according to customer requirement.

[0003] According to current operation method, need first put module in jig connected to tripod, utilize the movable of tripod to satisfy the shooting of left and right, up and down angle, but due to module assembly difference, the shooting angle of different module will have a little error, leading to poor data comparability when comparing different module resolution in horizontal direction. UTILITY MODEL CONTENT

[0004] In order to overcome the above-mentioned prior art exists the deficiency, the utility model's purpose is to provide a device of can realize multi -angle real -shot, can ensure the consistency of test condition, improve the accuracy and reliability of test result, make the test result between different module have higher comparability.

[0005] In order to achieve the above-mentioned purpose, the utility model's technical scheme is a device of can realize multi -angle real -shot, including loading platform, lifting mechanism, RZ axle rotary table mechanism, RY axle rotary table mechanism, base plate and the jig for fixing camera module, the fixed end of lifting mechanism is arranged on the loading platform, the fixed end of RZ axle rotary table mechanism is arranged on the movable end of lifting mechanism, the base plate is arranged on the rotary end of RZ axle rotary table mechanism, the fixed end of RY axle rotary table mechanism is arranged on the base plate, and the jig is arranged on the rotary end of RY axle rotary table mechanism.

[0006] As one of the implementation, the device further includes X axis fine adjustment sliding table, the fixed end of X axis fine adjustment sliding table is arranged on the movable end of lifting mechanism, and the fixed end of RZ axle rotary table mechanism is arranged on the movable end of X axis fine adjustment sliding table.

[0007] As one of the implementation, the X axis fine adjustment sliding table includes dovetail guide rail, dovetail sliding block fine adjustment screw and fine adjustment knob, the dovetail guide rail is arranged along X axis direction and is fixed to the movable end of lifting mechanism, the dovetail sliding block is slidably installed on the dovetail guide rail, and the fine adjustment knob is installed on one side of the dovetail sliding block through fine adjustment screw.

[0008] As one embodiment, the RZ axis turntable mechanism includes a first base, a first rotating shaft, and a first turntable. The first rotating shaft is arranged along the Z-axis direction, and one end of the first rotating shaft is rotatably mounted in the first base, while the other end is fixed to the first turntable. The first base is fixed to the movable end of the X-axis fine-tuning slide, and the base plate is fixed on the first turntable.

[0009] As one embodiment, an RY-axis rotating scale is fixed on the substrate, and a connecting plate is fixed to the movable end of the RY-axis turntable mechanism. The connecting plate is connected to the RY-axis rotating scale by a locking set screw.

[0010] As one embodiment, the side of the connecting plate is flush with the outer side of the RY axis rotating dial, and a pointer is fixed on the side of the connecting plate, with the tip of the pointer extending to the outer surface of the RY axis rotating dial.

[0011] As one embodiment, the RY-axis turntable mechanism includes a second base, a second rotating shaft, and a second turntable. The second rotating shaft is arranged along the Y-axis direction, and one end of the second rotating shaft is rotatably mounted in the second base, while the other end is fixed to the second turntable. The second base is fixed on the base plate, and the fixture is fixed on the second turntable.

[0012] As one embodiment, the fixture is fixed to the heating mechanism, and the heating mechanism is fixed to the rotating end of the RY axis turntable mechanism.

[0013] As one embodiment, the heating mechanism includes a U-shaped base, a heating element disposed within the U-shaped base, and a heat sensor fixed to the U-shaped base. The fixture is fixed within the U-shaped groove of the U-shaped base, and the sensing end of the heat sensor is in contact with the fixture.

[0014] As one embodiment, the lifting mechanism includes a base plate, a lifting platform, a first connecting rod, a second connecting rod, a lead screw, a first slider, and a second slider; the base plate is fixed to the loading platform, the first slider is slidably mounted on the top surface of the base plate, the lower end of the first connecting rod is hinged to the first slider, the lower end of the second connecting rod is hinged to the base plate, the middle of the first connecting rod and the second connecting rod are hinged, the upper end of the first connecting rod is hinged to the lifting platform, the upper end of the second connecting rod is hinged to the second slider, the second slider is mounted on the lead screw, and the lead screw is mounted on the bottom surface of the lifting platform with an adjustment knob at one end.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] (1) This utility model can drive the camera module to move up and down to align with the center of the chart through the lifting mechanism. The camera module can be rotated up, down, left and right through the RZ axis turntable mechanism and the RY axis turntable mechanism to achieve precise testing, ensuring the consistency of test conditions and improving the accuracy and reliability of test results.

[0017] (2) The present invention can finely adjust the position of the camera module in the X-axis direction through the X-axis fine adjustment slide, so that the camera module is more accurately aligned with the center of the chart.

[0018] (3) By setting an RY axis rotating scale and fixing one end of the connecting plate to the second turntable of the RY axis turntable mechanism, and the other end to be pressed against the RY axis rotating scale by a locking screw, the accuracy and stability of angle control can be improved. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the structure of the device for realizing multi-angle real-time shooting provided in the embodiment of this utility model;

[0021] Figure 2 A partial schematic diagram of the device for achieving multi-angle real-time shooting provided in an embodiment of this utility model;

[0022] Figure 3 A schematic diagram of the heating mechanism provided in an embodiment of this utility model;

[0023] In the diagram: 1. Loading platform; 2. Lifting mechanism; 21. Base plate; 22. Lifting platform; 23. First connecting rod; 24. Second connecting rod; 25. Adjustment knob; 3. X-axis fine-tuning slide; 31. Dovetail guide rail; 32. Dovetail slider; 33. Fine-tuning knob; 4. RZ-axis turntable mechanism; 41. First base; 42. First turntable; 5. Base plate; 6. RY-axis turntable mechanism; 61. Second base; 62. Second turntable; 63. RY-axis rotating scale; 64. Connecting plate; 65. Locking screw; 66. Pointer; 7. Heating mechanism; 71. U-shaped base; 72. Heating element; 73. Thermal sensor; 74. First bolt; 75. Second bolt; 76. Temperature control box; 8. Fixture; 81. Third base; 82. Pressure plate; 83. Buckle; 9. Camera module; 10. Test box. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0025] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0027] like Figures 1-2 As shown, this embodiment provides a device capable of multi-angle real-world shooting, including a loading platform 1, a lifting mechanism 2, an RZ-axis turntable mechanism 4, an RY-axis turntable mechanism 6, a base plate 5, and a fixture 8 for fixing a camera module 9. The fixed end of the lifting mechanism 2 is disposed on the loading platform 1, the fixed end of the RZ-axis turntable mechanism 4 is disposed on the movable end of the lifting mechanism 2, the base plate 5 is disposed on the rotating end of the RZ-axis turntable mechanism 4, the fixed end of the RY-axis turntable mechanism 6 is disposed on the base plate 5, and the fixture 8 is disposed on the rotating end of the RY-axis turntable mechanism 6. In this embodiment, the lifting mechanism 2 can drive the camera module 9 to move up and down to align with the center of the chart. The RZ-axis turntable mechanism 4 and the RY-axis turntable mechanism 6 can drive the camera module 9 to rotate in the up, down, left, and right angles with precise positioning for testing, ensuring consistency of test conditions and improving the accuracy and reliability of test results.

[0028] In an optimized embodiment, the device further includes an X-axis fine-tuning slide 3, the fixed end of which is disposed at the movable end of the lifting mechanism 2, and the fixed end of the RZ-axis turntable mechanism 4 is disposed at the movable end of the X-axis fine-tuning slide 3. The X-axis fine-tuning slide 3 allows for fine-tuning of the position of the fixture 8 and the camera module 9 on the fixture 8 in the X-axis direction, resulting in more precise alignment between the camera module 9 and the center of the chart.

[0029] In some embodiments, the X-axis fine-tuning slide 3 includes a dovetail guide rail 31, a dovetail slider 32, a fine-tuning screw, and a fine-tuning knob 33. The dovetail guide rail 31 is arranged along the X-axis and fixed to the movable end of the lifting mechanism 2. The dovetail slider 32 is slidably mounted on the dovetail guide rail 31, and the fine-tuning knob 33 is mounted on one side of the dovetail slider 32 via the fine-tuning screw. Figure 2 As shown, the dovetail guide rail 31 is fixed on the lifting platform 22 of the lifting mechanism 2, and the first base 41 of the RZ axis turntable mechanism 4 is fixed on the dovetail slider 32. By rotating the fine adjustment knob 33, the fine adjustment screw is driven to rotate, thereby driving the dovetail slider 32 to move along the dovetail guide rail 31, so as to realize the fine adjustment of the position of the RZ axis turntable mechanism 4 and the RY axis turntable mechanism 6, the fixture 8 and the camera module 9 on it in the X-axis direction.

[0030] In some embodiments, the RZ-axis turntable mechanism 4 includes a first base 41, a first rotating shaft, and a first turntable 42. The first rotating shaft is arranged along the Z-axis direction, with one end rotatably mounted in the first base 41 and the other end fixed to the first turntable 42. The first base 41 is fixed to the movable end of the X-axis fine-tuning slide 3, and the base plate 5 is fixed on the first turntable 42. One end of the first rotating shaft can be mounted in the first base 41 via a bearing, and the other end is fixedly connected to the first turntable 42, allowing the first turntable 42 to rotate around the Z-axis on the first base 41. Preferably, the first base 41 is provided with a scale, and the first turntable 42 is provided with markings to facilitate precise control of the rotation angle. When left and right shots are required, rotating the first turntable 42 allows the base plate 5 and its RZ-axis turntable mechanism 6, fixture 8, and camera module 9 to rotate around the Z-axis, thereby achieving left and right angle testing.

[0031] In an optimized embodiment, an RY-axis rotating scale 63 is fixed on the substrate 5, and a connecting plate 64 is fixed to the movable end of the RY-axis turntable mechanism 6. The connecting plate 64 is connected to the RY-axis rotating scale 63 via a locking set screw 65. Figure 2The RY axis rotating dial 63 is arc-shaped, and its outer surface is marked with scale marks to facilitate control of the rotation angle of the RY axis turntable mechanism 6 and improve the accuracy of angle control. The fixture 8 is fixed on the connecting plate 64. One end of the connecting plate 64 is fixedly connected to the second turntable 62 of the RY axis turntable mechanism 6, and the other end is provided with a threaded hole for connecting the locking screw 65. One end of the locking screw 65 passes through the threaded hole and abuts against the arc surface of the RY axis rotating dial 63 to lock the fixture 8 and the camera module 9 on the connecting plate 64 at the corresponding angles to ensure the stability of angle control.

[0032] Furthermore, the side of the connecting plate 64 is flush with the outer side of the RY axis rotating dial 63, and a pointer 66 is fixed to the side of the connecting plate 64, with the tip of the pointer 66 extending to the outer surface of the RY axis rotating dial 63. The pointer 66 allows for a more intuitive reading of the rotation angle of the RY axis turntable mechanism 6, facilitating precise control of the rotation angle. In this embodiment, a test box 10 is also fixed to the base plate 5.

[0033] In some embodiments, the RY-axis turntable mechanism 6 includes a second base 61, a second rotating shaft, and a second turntable 62. The second rotating shaft is arranged along the Y-axis direction, with one end rotatably mounted in the second base 61 and the other end fixed to the second turntable 62. The second base 61 is fixed to the base plate 5, and the fixture 8 is fixed to the second turntable 62. One end of the second rotating shaft can be mounted in the second base 61 via a bearing, and the other end is fixedly connected to the second turntable 62, allowing the second turntable 62 to rotate around the Y-axis on the second base 61. When a forward / backward rotation angle is required for shooting, rotating the second turntable 62 allows the connecting plate 64 and its fixture 8 and camera module 9 to rotate around the Y-axis. When the rotation angle of the RY-axis turntable mechanism 6 needs to be fixed, rotating the locking screw 65 presses it tightly against the arc surface of the RY-axis rotating scale 63, thus locking the angle and enabling vertical angle testing.

[0034] In an optimized embodiment, the fixture 8 is fixed to the heating mechanism 7, and the heating mechanism 7 is fixed to the rotating end of the RY-axis rotary table mechanism 6. Figure 2 The heating mechanism 7 is fixed on the connecting plate 64. The heating mechanism 7 can heat the fixture 8 and the camera module 9 on it to meet the resolution requirements of the module for taking pictures at different temperatures.

[0035] like Figure 3As shown, the heating mechanism 7 includes a U-shaped base 71, a heating element 72 disposed within the U-shaped base 71, and a thermal sensor 73 fixed to the U-shaped base 71. The fixture 8 is fixed within the U-shaped groove of the U-shaped base 71, and the sensing end of the thermal sensor 73 is in contact with the fixture 8. The heat generated by the heating element 72 is transferred to the camera module 9 through the U-shaped base 71 and the fixture 8. The thermal sensor 73 monitors the temperature of the fixture 8 in real time and accurately, ensuring that the temperature of the camera module 9 remains within the set range during actual shooting, greatly improving testing accuracy and efficiency.

[0036] Furthermore, each of the two sides of the U-shaped base 71 is provided with a first bolt 74 hole, and the fixture 8 is provided with a second bolt 75 hole at the corresponding position of the first bolt 74 hole. The first bolt 74 hole and the corresponding second bolt 75 hole are connected by a first bolt 74. In this embodiment, each of the two sides of the U-shaped base 71 is provided with two first bolt 74 holes, and each side of the fixture 8 is provided with two second bolt 75 holes. By connecting the first bolt 74 holes and the corresponding second bolt 75 holes with first bolts 74, the fixture 8 can be securely fixed to the U-shaped base 71, while facilitating the installation and disassembly of the fixture 8.

[0037] In this optimized embodiment, heating elements 72 are provided in both sides of the U-shaped base 71. By providing heating elements 72 in both sides of the U-shaped base 71, heat can be more evenly distributed throughout the entire U-shaped base 71, ensuring that the heating elements 72 can stably and evenly heat the U-shaped base 71, the fixture 8, and the camera module 9, thereby improving the accuracy and stability of temperature control.

[0038] In some embodiments, the end faces of both arms of the U-shaped base 71 are provided with mounting grooves adapted to the heating element 72, and the heating element 72 is installed in the mounting grooves. The mounting grooves allow the heating element 72 to be precisely placed in a predetermined position.

[0039] Furthermore, second bolts 75 are provided on the end faces of the two arms of the U-shaped base 71. The thread of the second bolt 75 is located inside the side arm of the U-shaped base 71, and the nut of the second bolt 75 at least partially presses against the heating element 72. The heating element 72 can be fixed in the mounting groove by the second bolts 75 to ensure that the heating element 72 can stably heat the fixture 8 and the camera module 9.

[0040] Furthermore, bolt grooves are provided on the end faces of both arms of the U-shaped base 71. These bolt grooves communicate with the mounting groove, and a threaded hole is provided at the bottom of the bolt groove. The thread of the second bolt 75 is located in the threaded hole, and the nut of the second bolt 75 is located in the bolt groove and partially extends into the mounting groove, pressing against the end face of the heating element 72. When the second bolt 75 is tightened, the nut of the second bolt 75 will at least partially extend into the mounting groove and press against the end face of the heating element 72, thereby firmly fixing the heating element 72 in the U-shaped base 71.

[0041] In some embodiments, mounting holes are provided on the bottom arm of the U-shaped base 71, and a receiving groove is provided on the fixture 8. The sensing end of the thermal sensor 73 extends into the receiving groove through the mounting holes. In this embodiment, by extending the sensing end of the thermal sensor 73 into the fixture 8, the error in temperature measurement can be minimized, ensuring that the thermal sensor 73 can more accurately sense the temperature of the fixture 8.

[0042] Preferably, the heating element 72 is a heating tube, and the thermal sensor 73 is a thermocouple. In this embodiment, the heating element 72 may also be a resistance wire, and the thermal sensor 73 may also be a resistance temperature detector (RTD).

[0043] In this embodiment, the heating mechanism 7 further includes a temperature control box 76, and both the heating element 72 and the thermal sensor 73 are connected to the temperature control box 76. The temperature control box 76 includes a housing, a temperature controller disposed within the housing, and a power supply for supplying power to the temperature controller. Both the heating element 72 and the thermal sensor 73 are connected to the temperature controller. Specifically, the actual shooting test temperature is set by the temperature controller. The thermal sensor 73 monitors and feeds back the temperature change of the fixture 8 to the temperature controller in real time. The temperature controller controls the heating element 72 to work continuously. When the temperature of the thermal sensor 73 reaches the set temperature, the temperature controller controls the heating element 72 to reduce power consumption and maintain the temperature at the set temperature ±0.1℃, thereby keeping the temperature of the camera module 9 within the set range and improving the stability of the test temperature.

[0044] Furthermore, the fixture 8 includes a third base 81 and a pressure plate 82 disposed on the third base 81. The third base 81 is provided with a fixing groove for fixing the camera module 9, and the pressure plate 82 is provided with a window for the lens portion of the camera module 9 to extend out. In this embodiment, the lens portion of the camera module 9 can extend through the window on the pressure plate 82 for testing. The fixture 8 can be made of a material with good thermal conductivity and stability.

[0045] Furthermore, one end of the pressure plate 82 is hinged to one end of the third base 81, and the other end of the pressure plate 82 is connected to the other end of the third base 81 via a snap fastener 83. This connection between the pressure plate 82 and the third base 81 allows the pressure plate 82 to rotate to a certain extent relative to the third base 81, facilitating opening to place the camera module 9 and closing to secure the camera module 9. The snap fastener 83 includes a fastening part and a hook part. The fastening part is hinged to the pressure plate 82 and can rotate relative to the pressure plate 82; the hook part is fixed to the third base 81, and the fastening part and the hook part cooperate to fix the pressure plate 82 and the third base 81 together.

[0046] In some embodiments, the lifting mechanism 2 includes a base plate 21, a lifting platform 22, a first connecting rod 23, a second connecting rod 24, a lead screw, a first slider, and a second slider. The base plate 21 is fixed to the loading platform 1. The first slider is slidably mounted on the top surface of the base plate 21. The lower end of the first connecting rod 23 is hinged to the first slider. The lower end of the second connecting rod 24 is hinged to the base plate 21. The middle parts of the first connecting rod 23 and the second connecting rod 24 are hinged. The upper end of the first connecting rod 23 is hinged to the lifting platform 22. The upper end of the second connecting rod 24 is hinged to the second slider. The second slider is mounted on the lead screw. The lead screw is mounted on the bottom surface of the lifting platform 22 and has an adjustment knob 25 at one end. In this embodiment, the adjustment knob 25 drives the lead screw to rotate, and the linear movement of the second slider drives the lifting platform 22 to move up and down, thereby driving the camera module 9 to move up and down, aligning the center of the camera module 9 with the center of the chart.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device capable of multi-angle real-time shooting, characterized in that: The device includes a loading platform, a lifting mechanism, an RZ-axis turntable mechanism, an RY-axis turntable mechanism, a base plate, and a fixture for fixing a camera module. The fixed end of the lifting mechanism is disposed on the loading platform, the fixed end of the RZ-axis turntable mechanism is disposed on the movable end of the lifting mechanism, the base plate is disposed on the rotating end of the RZ-axis turntable mechanism, the fixed end of the RY-axis turntable mechanism is disposed on the base plate, and the fixture is disposed on the rotating end of the RY-axis turntable mechanism.

2. The device for multi-angle real-time shooting as described in claim 1, characterized in that: It also includes an X-axis fine-tuning slide, the fixed end of which is located at the movable end of the lifting mechanism, and the fixed end of the RZ-axis turntable mechanism is located at the movable end of the X-axis fine-tuning slide.

3. The device for multi-angle real-time shooting as described in claim 2, characterized in that: The X-axis fine-tuning slide includes a dovetail guide rail, a dovetail slider fine-tuning screw, and a fine-tuning knob. The dovetail guide rail is arranged along the X-axis and fixed to the movable end of the lifting mechanism. The dovetail slider is slidably mounted on the dovetail guide rail, and the fine-tuning knob is mounted on one side of the dovetail slider via the fine-tuning screw.

4. The device for multi-angle real-time shooting as described in claim 2, characterized in that: The RZ axis turntable mechanism includes a first base, a first rotating shaft, and a first turntable. The first rotating shaft is arranged along the Z-axis direction, and one end of the first rotating shaft is rotatably mounted in the first base, while the other end is fixed to the first turntable. The first base is fixed to the movable end of the X-axis fine-tuning slide, and the base plate is fixed on the first turntable.

5. The device for multi-angle real-time shooting as described in claim 1, characterized in that: An RY axis rotating scale is fixed on the base plate, and a connecting plate is fixed to the movable end of the RY axis turntable mechanism. The connecting plate is connected to the RY axis rotating scale by a locking screw.

6. The device for multi-angle real-time shooting as described in claim 5, characterized in that: The side of the connecting plate is flush with the outer side of the RY axis rotating dial, and a pointer is fixed on the side of the connecting plate, with the tip of the pointer extending to the outer side of the RY axis rotating dial.

7. The device for multi-angle real-time shooting as described in claim 1, characterized in that: The RY-axis turntable mechanism includes a second base, a second rotating shaft, and a second turntable. The second rotating shaft is arranged along the Y-axis direction, and one end of the second rotating shaft is rotatably mounted in the second base, while the other end is fixed to the second turntable. The second base is fixed to the base plate, and the fixture is fixed to the second turntable.

8. The device for multi-angle real-time shooting as described in claim 1, characterized in that: The fixture is fixed to the heating mechanism, which is fixed to the rotating end of the RY axis turntable mechanism.

9. The device for multi-angle real-time shooting as described in claim 8, characterized in that: The heating mechanism includes a U-shaped base, a heating element disposed within the U-shaped base, and a heat sensor fixed to the U-shaped base. The fixture is fixed within the U-shaped groove of the U-shaped base, and the sensing end of the heat sensor is in contact with the fixture.

10. The device for multi-angle real-time shooting as described in claim 1, characterized in that: The lifting mechanism includes a base plate, a lifting platform, a first connecting rod, a second connecting rod, a lead screw, a first slider, and a second slider. The base plate is fixed to the loading platform. The first slider is slidably mounted on the top surface of the base plate. The lower end of the first connecting rod is hinged to the first slider. The lower end of the second connecting rod is hinged to the base plate. The middle parts of the first and second connecting rods are hinged together. The upper end of the first connecting rod is hinged to the lifting platform. The upper end of the second connecting rod is hinged to the second slider. The second slider is mounted on the lead screw. The lead screw is mounted on the bottom surface of the lifting platform and has an adjustment knob at one end.

Images