Flower basket lifting device

Abstract

The utility model relates to a flower basket lifting device which comprises a lifting arm, a lifting frame and two connecting frames arranged at intervals, and the connecting frames are connected with the lifting arm. The lifting frame can move up and down relative to the lifting arm, the lifting frame is located between the two connecting frames, an installation space is formed between the lifting frame and the connecting frames, and the flower basket located in the installation space is connected with the lifting frame and the connecting frames; the lifting frame is at least provided with a first position and a second position relative to the lifting arm, and when the lifting frame is located at the first position, the flower basket in the mounting space is in a horizontal state; when the lifting frame is located at the second position, the flower baskets in the two installation spaces are inclined relative to the horizontal plane, and therefore liquid in the flower baskets can be discharged conveniently.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic cell manufacturing technology, specifically to a flower basket lifting device. Background Technology

[0002] In wet processing equipment for solar cells, such as texturing equipment, a basket containing solar cells is placed in a wet processing solution for wet processing of the cells. After wet processing is completed, a lifting device slowly pulls the basket containing the solar cells out of the wet processing solution. In the prior art, the basket is in a horizontal position after being removed from the wet processing solution, and a large amount of solution remains inside. This leads to significant waste of the solution in the wet processing equipment, increasing processing costs. Furthermore, the solution in the basket can cause the solar cells to stick together, potentially affecting the stability of the cells assembled in the basket. Utility Model Content

[0003] The purpose of this invention is to provide a new flower basket lifting device.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a flower basket lifting device, comprising a fixing mechanism for fixing the flower basket and a lifting arm for driving the fixing mechanism to move up and down, wherein the fixing mechanism includes:

[0005] The connecting frame includes two frames spaced apart along a first direction, and the connecting frame is connected to the lifting arm;

[0006] The lifting frame is configured to move up and down relative to the lifting arm. The lifting frame is located between the two connecting frames along the first direction. An installation space for installing a flower basket is formed between the lifting frame and the two connecting frames. The flower basket located in the installation space is connected to the lifting frame and the connecting frames.

[0007] The lifting frame has at least a first position and a second position relative to the lifting arm. When the lifting frame is in the first position, the flower basket in the installation space is in a horizontal state; when the lifting frame is in the second position, the flower baskets in the two installation spaces are tilted relative to the horizontal plane.

[0008] In some embodiments, the flower basket lifting device has a first state and a second state. When in the first state, the lifting frame is in the first position; when in the second state, the connecting frame is fixed and the lifting frame is in the second position.

[0009] In some embodiments, the fixing mechanism includes a connecting component for cooperating with the flower basket. The connecting component includes a first connecting member disposed on the connecting frame and a second connecting member disposed on the lifting frame. When the lifting frame is in the first position, the first connecting member and the second connecting member are at the same height. When the lifting frame is in the second position, the first connecting member and the second connecting member are offset from each other in the vertical direction.

[0010] In some embodiments, the flower basket lifting device includes a slide cylinder and a linkage, the slide cylinder having a slide capable of moving up and down, and the linkage connecting the slide and the lifting frame.

[0011] In some embodiments, one of the lifting frame and the lifting arm is provided with a groove extending in the vertical direction, and the other of the two is fixed with a sliding member, which is slidably inserted into the groove.

[0012] In some embodiments, the sliding member is fixedly connected to the lifting arm, and the basket lifting device is further provided with a limiting member, which is fixedly connected to the free end of the sliding member, and the lifting frame is engaged between the limiting member and the lifting arm.

[0013] In some embodiments, the flower basket lifting device is provided with multiple sets of the fixing mechanisms along a second direction, the second direction being perpendicular to the first direction, and the flower basket lifting device having a virtual symmetry plane extending along the first direction and simultaneously extending in the vertical direction, with the multiple sets of fixing mechanisms symmetrically distributed relative to the virtual symmetry plane.

[0014] In some embodiments, the flower basket lifting device is provided with three sets of the fixing mechanisms along the second direction, and the three lifting frames are fixedly connected, or the three lifting frames are integrally formed.

[0015] In some embodiments, the lower part of the connecting frame has a downward-facing pointed tip.

[0016] In some embodiments, the lower part of the lifting frame has a downward-facing pointed tip.

[0017] In some embodiments, the connecting frame is provided with a first connector for connecting the flower basket. The first connector includes two members spaced apart along a second direction, which is perpendicular to the first direction. The connecting frame is provided with two tips spaced apart along the second direction, and the two tips extend downward from the two first connectors respectively.

[0018] In some embodiments, the lifting frame is provided with a second connector for connecting the flower basket. The second connector includes two sets of connectors spaced apart along a second direction, which is perpendicular to the first direction. The lifting frame is provided with two tips spaced apart along the second direction, and the two tips extend downward from the two sets of the second connectors, respectively.

[0019] In some embodiments, the second position is located above the first position.

[0020] Due to the application of the above technical solution, this utility model has the following advantages: When the lifting frame is in the first position, the flower basket in the installation space is in a horizontal state. During the process of lifting the flower basket containing the battery cells out of the liquid such as medicine, the lifting frame can be driven up and down and switched to the second position, thereby tilting the flower baskets on both sides of the lifting frame relative to the horizontal plane, so that the liquid can be discharged from the flower basket and avoid a large amount of liquid remaining in the flower basket. The lifting device only needs to drive the lifting frame up and down to simultaneously tilt all the flower baskets in the installation space on both sides of the lifting frame or simultaneously convert all the flower baskets to a horizontal state. The device principle is simple and the operation is simple. Attached Figure Description

[0021] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the embodiments 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.

[0022] Appendix Figure 1 This is a front view of a flower basket lifting device according to a specific embodiment of the present utility model;

[0023] Appendix Figure 2 For the appendix Figure 1 Top view;

[0024] Appendix Figure 3 For the appendix Figure 1 Side view;

[0025] Appendix Figure 4 For the attached Figure 1 Sectional view along the middle AA direction;

[0026] Appendix Figure 5 For the attached Figure 1 Sectional view along the BB direction;

[0027] Appendix Figure 6 For the appendix Figure 2 A schematic diagram after removing the top plate of the lifting arm;

[0028] Appendix Figure 7 For the attached Figure 2 A cross-sectional view along the CC direction;

[0029] Appendix Figure 8 This is a schematic diagram of a flower basket device in a first state according to a specific embodiment.

[0030] Appendix Figure 9 This is a schematic diagram of a flower basket device in a second state according to a specific embodiment.

[0031] In the attached diagrams: 101, First installation space; 102, Second installation space; 100, Flower basket; 10, Tip; 11, First connecting frame; 12, Second connecting frame; 13, Lifting frame; 131, Slide groove; 132, Slot; 14, First connecting piece; 15, Second connecting piece; 2, Lifting arm; 21, Mounting base; 211, Sliding piece; 212, Limiting piece; 22, First fixed base; 23, Second fixed base; 24, Support rod; 25, Top plate; 31, Slide cylinder; 32, Linkage piece. Detailed Implementation

[0032] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is for the purpose of aiding understanding the present invention, but does not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] In the production process of solar cells, to improve the safety and efficiency of processing, transportation, and storage, baskets (100) are typically used to carry and store the cells. See also... Figures 1 to 3 The illustrated flower basket lifting device includes a fixing mechanism for securing the flower basket 100 and a lifting arm 2 for driving the fixing mechanism to move up and down. During wet processing of solar cells, the fixing mechanism secures the flower basket 100 containing the solar cells, and the lifting arm 2 drives the flower basket 100 to move up and down, thereby immersing the flower basket 100 in the liquid or lifting it out of the liquid. The fixing mechanism includes a connecting frame and a lifting frame 13. The connecting frame includes two frames spaced apart along a first direction and is connected to the lifting arm 2. The lifting frame 13 is movable up and down relative to the lifting arm 2. The lifting frame 13 is located between the two connecting frames along the first direction, and installation spaces for mounting the flower basket 100 are formed between the lifting frame 13 and the two connecting frames. The flower basket 100 located within the installation space is connected to the lifting frame 13 and the connecting frame.

[0034] The lifting frame 13 has at least a first position and a second position relative to the lifting arm 2, see [reference]. Figure 8 As shown, when the lifting frame 13 is in the first position, the flower basket 100 within the installation space is in a horizontal state. See also Figure 9 As shown, when the lifting frame 13 is in the second position, the flower baskets 100 in the two installation spaces are tilted relative to the horizontal plane. When the flower basket 100 containing the battery cells is lifted upward from the liquid treated by the flower basket lifting device, the lifting frame 13 can be adjusted to move it to the second position, thereby tilting the flower baskets 100 located on both sides of the lifting frame 13 to facilitate the discharge of liquid from the flower baskets 100.

[0035] In this embodiment, the flower basket lifting device has a first state and a second state. When the flower basket lifting device is in the first state, the lifting frame 13 is in the first position. When the flower basket lifting device is in the second state, the connecting frame is fixed and the lifting frame 13 moves to the second position.

[0036] In this embodiment, see Figure 1 As shown, the first direction is the length extension direction of the lifting arm 2, and more preferably, the first direction extends horizontally. In some embodiments, the connecting frame is fixedly connected to the lifting arm 2, so that the connecting frame remains stationary relative to the lifting arm 2 during the transition of the lifting device between the first state and the second state. In other embodiments, the connecting frame is movably connected to the lifting arm 2, and when the lifting device transitions between the first state and the second state, the connecting frame remains stationary relative to the lifting arm 2 in the vertical direction.

[0037] In this embodiment, the two connecting frames are a first connecting frame 11 and a second connecting frame 12, which are respectively connected to the lifting arm 2. The lifting frame 13 is located between the first connecting frame 11 and the second connecting frame 12 along a first direction. A first installation space 101 is formed between the lifting frame 13 and the first connecting frame 11, and a second installation space 102 is formed between the lifting frame 13 and the second connecting frame 12. The flower basket 100 located in the first installation space 101 is connected to the first connecting frame 11 and the lifting frame 13, and the flower basket 100 located in the second installation space 102 is connected to the second connecting frame 12 and the lifting frame 13.

[0038] In this embodiment, the fixing mechanism includes a connecting assembly for cooperating with the flower basket 100. The connecting assembly includes a first connecting member 14 disposed on the connecting frame and a second connecting member 15 disposed on the lifting frame 13. When the lifting frame 13 is in the first position, the first connecting member 14 and the second connecting member 15 are at the same height, thereby keeping the flower basket 100 in a horizontal state. When the lifting frame 13 is in the second position, the first connecting member 14 and the second connecting member 15 are offset from each other in the vertical direction, thereby causing the flower baskets 100 on both sides to tilt.

[0039] Specifically, the lifting frame 13 is provided with a second connecting member 15 on both the side facing the first connecting frame 11 and the side facing the second connecting frame 12. The first connecting member 14 on the first connecting frame 11 and the second connecting member 15 on the side of the lifting frame 13 facing the first connecting frame 11 cooperate with each other to fix the flower basket 100 in the first installation space 101. The first connecting member 14 on the second connecting frame 12 and the second connecting member 15 on the side of the lifting frame 13 facing the second connecting frame 12 cooperate with each other to fix the flower basket 100 in the second installation space 102.

[0040] In this embodiment, the flower basket 100 is provided with a hook groove. The first connecting member 14 and the second connecting member 15 are components that can be inserted into the hook groove and connected to it, such as hooks, connecting pins, etc. In some embodiments, the first connecting member 14 and the second connecting member 15 are rod-shaped, and both the first connecting member 14 and the second connecting member 15 extend along a first direction. The free end of the first connecting member 14 and the free end of the second connecting member 15 are fixedly connected together to form a connecting rod extending along the first direction. The flower basket 100 is hung on the connecting rod. The first connecting member 14 and the second connecting member 15 can be directly integrally formed into a connecting rod, and then the connecting rod is fixedly connected between the connecting frame and the lifting frame 13.

[0041] In some embodiments, when the lifting frame 13 transitions from the first position to the second position, the lifting frame 13 moves downward relative to the lifting arm 2, i.e., the second position is below the first position, causing the flower basket 100 to move downward near the side of the lifting frame 13, and the flower basket 100 extends downward at an angle towards the lifting frame 13 along the first direction. In this state, the projections of the flower baskets 100 on both sides of the lifting frame 13 in the vertical plane extending along the first direction are approximately V-shaped, and the liquid in both flower baskets 100 flows towards the direction of the lifting frame 13 and is eventually discharged downward from the flower baskets 100.

[0042] In this embodiment, see Figure 9 As shown, when the lifting frame 13 transitions from the first position to the second position, the lifting frame 13 moves upward relative to the lifting arm 2, meaning the second position is above the first position. This causes the flower basket 100 to move upward near the side of the lifting frame 13, and the flower basket extends downward toward the connecting frame along the first direction. In this state, the projections of the flower baskets 100 on both sides of the lifting frame 13 onto the vertical plane extending along the first direction are approximately inverted V-shaped, and the liquid in the flower baskets 100 on both sides flows toward the connecting frame. Specifically, the liquid in the flower basket 100 in the first installation space 101 flows toward the first connecting frame 11, and the liquid in the flower basket 100 in the second installation space 102 flows toward the second connecting frame 12.

[0043] In this embodiment, the distance between the lifting frame 13 and the two connecting frames is the same along the first direction. When the lifting frame 13 is in the first position, the flower baskets 100 on both sides of the lifting frame 13 are level. After the lifting frame 13 is switched to the second position, the tilt angles of the flower baskets 100 on both sides of the lifting frame 13 are consistent, thereby achieving the same drainage effect.

[0044] In this embodiment, the lifting frame 13 is slidably mounted on the lifting arm 2 in the vertical direction, and the lifting arm 2 is also provided with a drive assembly for driving the lifting frame 13 to move up and down. See also Figures 4 to 7 As shown, in this embodiment, the driving component includes a slide cylinder 31 and a linkage 32. The slide cylinder 31 has a slide capable of moving up and down, and the linkage 32 is connected between the slide and the lifting frame 13. When the lifting frame 13 switches between a first position and a second position, the slide cylinder 31 drives the linkage 32 to move up and down, and the linkage 32 drives the lifting frame 13 to move up and down. The slide cylinder 31 can ensure that the linkage 32 moves in a straight line, thereby ensuring the working accuracy of the flower basket lifting device.

[0045] In some embodiments, one of the lifting frame 13 and the lifting arm 2 is provided with a groove 131 extending in the vertical direction, and the other is fixedly provided with a sliding member 211. The sliding member 211 is slidably inserted into the groove 131, and the cooperation between the groove 131 and the sliding member 211 provides guidance for the vertical movement of the lifting frame 13. In this embodiment, the groove 131 is formed on the lifting frame 13, and the sliding member 211 is fixed on the lifting arm 2. See [reference needed] Figure 5 As shown, the lifting frame 13 is provided with multiple sliding grooves 131 at intervals along the second direction, and the lifting arm 2 is also provided with multiple sliding members 211 at intervals along the second direction. The multiple sliding members 211 are respectively inserted into the multiple sliding grooves 131, and the second direction is perpendicular to the first direction.

[0046] In this embodiment, see Figure 4 As shown, the flower basket lifting device also includes a limiting member 212, which is fixedly connected to the free end of the sliding member 211. The lifting frame 13 is engaged between the limiting member 212 and the lifting arm 2. Specifically, a mounting base 21 is fixedly connected to the lower part of the lifting arm 2. The sliding member 211 extends protruding from the mounting base 21 along a first direction. The limiting member 212 is fixedly mounted on one end of the sliding member 211 along the first direction. The limiting member 212 can prevent the lifting frame 13 from displacing along the first direction, thereby ensuring the normal operation of the lifting device.

[0047] In this embodiment, the lower part of the lifting arm 2 is also fixedly provided with a first fixed seat 22 and a second fixed seat 23. The first fixed seat 22 and the second fixed seat 23 are arranged at intervals along a first direction. The mounting seat 21 is located between the first fixed seat 22 and the second fixed seat 23. The first connecting frame 11 is connected to the first fixed seat 22, and the second connecting frame 12 is connected to the second fixed seat 23.

[0048] In this embodiment, a support rod 24 extending along a first direction is connected between the mounting base 21, the first fixed base 22, and the second fixed base 23. The support rod 24 is used to improve the stability of the mounting base 21, the first fixed base 22, and the second fixed base 23. See also... Figure 5 As shown, the upper part of the lifting frame 13 is provided with a slot 132, and the opening of the slot 132 faces upward. When the lifting frame 13 is in the second position, the support rod 24 is inserted into the slot 132. The slot 132 serves to avoid collision between the lifting frame 13 and the support rod 24 when the lifting frame 13 moves. At the same time, the cooperation between the support rod 24 and the slot 132 can also provide a positioning function for the movement of the lifting frame 13.

[0049] In this embodiment, the lifting arm 2 includes a main body and a top plate 25 covering the main body. An installation cavity is formed between the main body and the top plate 25, and the slide cylinder 31 is disposed in the installation cavity.

[0050] In this embodiment, the flower basket lifting device is provided with multiple sets of fixing mechanisms along the second direction, thereby enabling the assembly of multiple flower baskets 100. The flower basket lifting device has a virtual symmetry plane extending along the first direction and simultaneously extending in the vertical direction. The multiple sets of fixing mechanisms are symmetrically distributed relative to the virtual symmetry plane to ensure the stability of the lifting device. Specifically, the flower basket lifting device is provided with three sets of fixing mechanisms along the second direction, and the flower basket lifting device has six installation spaces for mounting flower baskets 100. In this embodiment, the three lifting frames 13 are fixedly connected, or the three lifting frames 13 are integrally formed. The flower basket lifting device only needs to be provided with one drive component, and through this drive component, the three lifting frames 13 can be synchronously driven to move up and down, thereby synchronously driving the flower baskets 100 in the six installation spaces to tilt.

[0051] In some embodiments, the lower part of the connecting frame is provided with a downward-facing pointed tip 10; or, the lower part of the lifting frame 13 is provided with a downward-facing pointed tip 10, which can guide the liquid flowing out of the flower basket 100 and prevent the liquid from spilling everywhere.

[0052] In this embodiment, each connecting frame is provided with two first connecting members 14, which are spaced apart along a second direction. The lower part of the connecting frame is provided with two pointed tips 10, which are spaced apart along the second direction and extend downward from the two first connecting members 14 respectively. When the flower basket lifting device is in the second state, the liquid in the flower basket 100 flows towards the connecting frame and is discharged downward along the two pointed tips 10.

[0053] In some embodiments, each lifting frame 13 is provided with two sets of second connectors 15, which are spaced apart along a second direction. The lower part of the lifting frame 13 is provided with two tips 10, which are spaced apart along the second direction and extend downward from the two sets of second connectors 15 respectively. When the flower basket lifting device transitions to the second state, the lifting frame 13 moves downward to the second position, and the liquid in the flower basket 100 flows towards the lifting frame 13 and is discharged downward along the two tips 10.

[0054] In summary, during the wet processing of the battery cells, the basket lifting device of this embodiment can switch to a first state, placing the basket 100 containing the battery cells in a horizontal position and immersing it in liquid for processing. When the processing is complete and the basket 100 is lifted upwards, the lifting frame 13 moves upwards to a second position, causing the basket lifting device to switch to the second state. All baskets 100 on both sides of the lifting frame 13 are tilted relative to the horizontal plane, facilitating the flow of liquid within the baskets 100 towards the connecting frame and dripping downwards along the tip 10 of the connecting frame. When the basket 100 rises to a preset height, the lifting frame 13 can be driven downwards to the first position, causing the basket lifting device to switch back to the first state, and the basket 100 returns to a horizontal position, facilitating subsequent processing. The basket lifting device only requires a drive assembly to move the lifting frame 13 up and down to switch all baskets 100 between the horizontal and tilted states, resulting in a simple structure and operation.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. In the event of any contradiction or inconsistency between the definitions used herein and those contained in other published documents, the definitions used herein shall prevail.

[0056] As indicated in this specification and claims, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0057] It is further understood that the terms "first," "second," etc., are used to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another, and do not indicate a specific order or degree of importance. In fact, the expressions "first," "second," etc., are completely interchangeable. For example, without departing from the scope of this disclosure, first information can also be referred to as second information, and similarly, second information can also be referred to as first information.

[0058] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made based on the essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A flower basket lifting device, characterized in that: It includes a fixing mechanism for securing the flower basket and a lifting arm for driving the fixing mechanism to move up and down. The fixing mechanism includes: The connecting frame includes two frames spaced apart along a first direction, and the connecting frame is connected to the lifting arm; The lifting frame is configured to move up and down relative to the lifting arm. The lifting frame is located between the two connecting frames along the first direction. An installation space for installing a flower basket is formed between the lifting frame and the two connecting frames. The flower basket located in the installation space is connected to the lifting frame and the connecting frames. The lifting frame has at least a first position and a second position relative to the lifting arm. When the lifting frame is in the first position, the flower basket in the installation space is in a horizontal state; when the lifting frame is in the second position, the flower baskets in the two installation spaces are tilted relative to the horizontal plane.

2. The flower basket lifting device according to claim 1, characterized in that: The fixing mechanism includes a connecting component for cooperating with the flower basket. The connecting component includes a first connecting member disposed on the connecting frame and a second connecting member disposed on the lifting frame. When the lifting frame is in the first position, the first connecting member and the second connecting member are at the same height. When the lifting frame is in the second position, the first connecting member and the second connecting member are offset from each other in the vertical direction.

3. The flower basket lifting device according to claim 1, characterized in that: The flower basket lifting device includes a slide cylinder and a linkage. The slide cylinder has a slide that can move up and down, and the linkage is connected between the slide and the lifting frame.

4. The flower basket lifting device according to claim 1, characterized in that: One of the lifting frame and the lifting arm is provided with a sliding groove extending in the vertical direction, and the other of the two is fixed with a sliding member, which is slidably inserted into the sliding groove.

5. The flower basket lifting device according to claim 4, characterized in that: The sliding member is fixedly connected to the lifting arm. The flower basket lifting device is also provided with a limiting member, which is fixedly connected to the free end of the sliding member. The lifting frame is positioned between the limiting member and the lifting arm.

6. The flower basket lifting device according to claim 1, characterized in that: The flower basket lifting device is provided with multiple sets of fixing mechanisms along the second direction, which is perpendicular to the first direction. The flower basket lifting device has a virtual symmetry plane that extends along the first direction and also extends in the vertical direction. The multiple sets of fixing mechanisms are symmetrically distributed relative to the virtual symmetry plane.

7. The flower basket lifting device according to claim 6, characterized in that: The flower basket lifting device is provided with three sets of fixing mechanisms along the second direction, and the three lifting frames are fixedly connected, or the three lifting frames are integrally formed.

8. The flower basket lifting device according to claim 1, characterized in that: The lower part of the connecting frame is provided with a downward-facing pointed tip; and / or, the lower part of the lifting frame is provided with a downward-facing pointed tip.

9. The flower basket lifting device according to claim 8, characterized in that: The connecting frame is provided with a first connecting member for connecting the flower basket. The first connecting member includes two members spaced apart along a second direction, which is perpendicular to the first direction. The connecting frame is provided with two tips spaced apart along the second direction, and the two tips extend downward from the two first connecting members respectively. And / or, the lifting frame is provided with a second connecting member for connecting the flower basket. The second connecting member includes two sets spaced apart along a second direction, which is perpendicular to the first direction. The lifting frame is provided with two tips spaced apart along the second direction, and the two tips extend downward from the two sets of second connecting members respectively.

10. The flower basket lifting device according to any one of claims 1 to 9, characterized in that: The second position is located above the first position; Alternatively, the flower basket lifting device has a first state and a second state. When it is in the first state, the lifting frame is in the first position; when it is in the second state, the connecting frame is fixed and the lifting frame is in the second position.

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