Disassembly and assembly auxiliary device

Abstract

The utility model provides a disassembly and assembly auxiliary device. The disassembly and assembly auxiliary device comprises a connecting structure, a supporting frame, a bearing structure, a lifting frame and a telescopic supporting structure. One end of the connecting structure is fixedly connected with the supporting frame; the bottom surface of the lifting frame is used for placing an object to be disassembled and assembled; the lifting frame is located in the supporting frame, the bearing structure is located between the lifting frame and the supporting frame, and the lifting frame and the supporting frame are slidably connected through the bearing structure; the telescopic supporting structure penetrates through the bottom face of the supporting frame and is connected with the bottom face of the lifting frame. By arranging the dismounting auxiliary device, the heavy motor does not need to be fixed manually when the servo motor is dismounted, the dismounting efficiency is improved, manpower and time needed by dismounting are reduced, rapid maintenance is facilitated, the recovery speed of equipment is improved, meanwhile, potential safety hazards of dismounting are reduced, and the utilization rate of the equipment is improved.

Description

Technical Field

[0001] The utility model belongs to the field of semiconductor equipment, in particular to a disassembly and assembly auxiliary device. Background Art

[0002] In the field of integrated circuit manufacturing, dry etching is a common etching process. In the dry etching process, a specific etching gas is introduced into the surface of the wafer in the reaction chamber. Under specific conditions, the etching gas reacts chemically with the material on the surface of the wafer, thereby achieving the purpose of etching. In the process of dry etching, it is particularly important to control the gas pressure in the reaction chamber. The pressure will affect the etching rate and thus the stability of the etching process. In the dry etching process, the gas pressure in the reaction chamber is usually controlled by an adaptive pressure controller (APC Motor, Adaptive Pressure Controller Motor) on the etcher. The adaptive pressure controller controls the opening of the pipeline by controlling the rotation angle of the valve disc at the pipeline port for introducing the etching gas into the reaction chamber through a servo motor, thereby adjusting the gas pressure in the reaction chamber.

[0003] In the daily production process, the adaptive pressure controller needs regular maintenance. When maintaining the servo motor of the adaptive pressure controller, because the servo motor is too heavy, about 10 kilograms, at least two people are required to cooperate in maintenance, one to hold the servo motor, and the other to disassemble the servo motor and fixing screws, in order to achieve the disassembly and installation of the servo motor. This process not only requires more manpower, but also wastes a long time, has low disassembly and assembly efficiency, affects the maintenance recovery time, and is easy to hit the operator, causing safety hazards.

[0004] Therefore, there is an urgent need for a device that can safely and efficiently disassemble and assemble the servo motor.

[0005] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present application and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology part of the present application. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a disassembly and assembly auxiliary device for solving the problems of low efficiency and unsafety in the disassembly and assembly process of the servo motor in the prior art.

[0007] In order to achieve the above purpose and other related purposes, the utility model provides the following technical solutions:

[0008] In a first aspect, the present utility model provides a disassembly and assembly assistance device, which includes: a connection structure, a support frame, a bearing structure, a lifting frame, and a telescopic support structure;

[0009] One end of the connection structure is fixedly connected to the support frame; the bottom surface of the lifting frame is used to place the object to be disassembled and assembled; the lifting frame is located within the support frame, the bearing structure is located between the lifting frame and the support frame, and the lifting frame is slidably connected to the support frame through the bearing structure; the telescopic support structure passes through the bottom surface of the support frame and is connected to the bottom surface of the lifting frame.

[0010] Optionally, the end of the connection structure that is not fixedly connected to the support frame is a snap structure.

[0011] Optionally, the support frame includes a telescopic structure for adjusting the position of the connection structure.

[0012] Optionally, the support frame includes three rectangular support sides and a rectangular support bottom surface. The bottom edge of each support side is respectively connected to a side edge of the support bottom surface, and the lengths of the bottom edge of the corresponding connected support side and the side edge of the support bottom surface are equal. The adjacent side edges of the three support sides are sequentially connected to form a "C"-shaped side frame with an opening.

[0013] Optionally, the lifting frame includes three rectangular lifting sides and a rectangular lifting bottom surface. The bottom edge of each lifting side is respectively connected to a side edge of the lifting bottom surface, and the lengths of the bottom edge of the corresponding connected lifting side and the side edge of the lifting bottom surface are equal. The adjacent side edges of the three lifting sides are sequentially connected to form a "C"-shaped side frame with an opening.

[0014] Optionally, the material of the support frame is stainless steel.

[0015] Optionally, the material of the lifting frame is stainless steel.

[0016] Optionally, the telescopic support structure includes a telescopic support shaft, a motor, and a motor switch. The motor is used to drive the telescopic movement of the telescopic support shaft, and the motor switch is used to control the on / off of the motor; one end of the telescopic support shaft is fixedly connected to the bottom surface of the lifting frame, the other end of the telescopic support shaft passes through the bottom surface of the support frame and is connected to the motor, and the motor is connected to the motor switch.

[0017] Optionally, the bearing structure is a sliding bearing.

[0018] Optionally, the bearing structure is composed of more than two rollers and a sliding track, the sliding track is located at a position where the lifting frame contacts the bearing structure, and the roller is located inside the sliding track.

[0019] As described above, the disassembly and assembly auxiliary device of the utility model has the following beneficial effects:

[0020] The utility model provides a disassembly and assembly auxiliary device, so that when the servo motor is disassembled, there is no need for manpower to fix the heavy motor, thereby improving the disassembly efficiency, reducing the manpower and time required for disassembly, facilitating rapid maintenance, improving the recovery speed of the equipment, and reducing the safety hazards of disassembly, thereby improving the utilization rate of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Shown is a side sectional view of the disassembly and assembly assisting device of the present invention.

[0022] Figure 2 Shown is a top cross-sectional view of the disassembly and assembly auxiliary device in the present utility model.

[0023] Figure 3 Shown is a schematic diagram of the installation position of a servo motor in the prior art.

[0024] Figure 4 Shown is a structural schematic diagram of the application of the disassembly and assembly auxiliary device in the utility model.

[0025] Figure 5 Shown is a side sectional view of an example of a disassembly and assembly assisting device in the present invention.

[0026] Figure 6 Shown is a partial enlarged view of the telescopic support shaft in an example of the disassembly and assembly auxiliary device in the utility model.

[0027] Figure 7 Shown is a partial enlarged view of the bearing structure in an example of the disassembly and assembly auxiliary device in the utility model.

[0028] Figure 8 It is a schematic diagram showing that the telescopic support shaft is stretched to the bottom of the servo motor when the servo motor is disassembled using the disassembly and assembly auxiliary device in the present invention.

[0029] Fig. 9 It is a schematic diagram showing the servo motor falling onto the supporting frame when the servo motor is disassembled using the disassembly and assembly auxiliary device in the present invention.

[0030] Fig.10 It is a schematic diagram showing that when the disassembly and assembly auxiliary device is used to install the servo motor in the utility model, the telescopic support shaft is retracted downward to the bottom of the support frame to place the servo motor.

[0031] Fig.11 It is a schematic diagram showing that when the servo motor is installed using the disassembly and assembly auxiliary device in the present invention, the telescopic support shaft stretches the servo motor upward to the position to be installed.

[0032] Component number description

[0033] 1. Connection structure; 2. Support frame; 21. Support side; 22. Support bottom; 3. Bearing structure; 31. Roller; 32. Sliding track; 4. Lifting frame; 41. Lifting side; 42. Lifting bottom; 5. Retractable support structure; 51. Retractable support shaft; 52. Bellows; 53. Motor; 54. Motor switch; 6. Servo motor; 7. APC housing; 9. Movement direction of the lifting frame; 10. Opening. DETAILED DESCRIPTION

[0034] The following is an explanation of the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0035] For example, when describing the embodiments of the present invention in detail, for the sake of convenience, the schematic diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0036] For convenience of description, spatially relative terms such as "under", "below", "below", "below", "above", "on", etc. may be used herein to describe the relationship of one element or feature shown in the drawings to other elements or features. It will be understood that these spatially relative terms are intended to encompass other orientations of the device in use or operation in addition to the orientation depicted in the drawings.

[0037] In the context of the present application, a structure in which a first feature is described as being "above" a second feature may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

[0038] It should be noted that the illustrations provided in this embodiment are only used to illustrate the basic concept of the present invention in a schematic manner, and therefore the illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0039] like Figure 1-Figure 2 As shown, the utility model provides a disassembly and assembly auxiliary device. Figure 1 is a side sectional view of the disassembly and assembly auxiliary device, Figure 2 is a top sectional view of the disassembly and assembly auxiliary device, Figure 2 The section line of the cross-sectional view is Figure 1 The position of AA is shown in Figure 1 The section line of the cross-sectional view is Figure 2 The position of BB shown in the figure, the disassembly and assembly auxiliary device comprises: a connecting structure 1, a supporting frame 2, a bearing structure 3, a lifting frame 4 and a retractable supporting structure 5;

[0040] One end of the connecting structure 1 is fixedly connected to the supporting frame 2; the bottom surface of the lifting frame 4 is used for placing the disassembled objects; the lifting frame 4 is located inside the supporting frame 2, and the bearing structure 3 is located between the lifting frame 4 and the supporting frame 2, and the lifting frame 4 and the supporting frame 2 are slidably connected through the bearing structure 3; the retractable supporting structure 5 passes through the bottom surface of the supporting frame 2 and is connected to the bottom surface of the lifting frame 4.

[0041] In the prior art, an adaptive pressure controller (APC) for controlling the pressure of an etching chamber of dry etching controls the rotation angle of a valve disc through a servo motor 6. The rotation of the valve disc controls the opening of a gas pipeline entering and exiting the etching chamber, thereby controlling the gas pressure in the etching chamber. However, when performing regular maintenance on the APC, the servo motor 6 needs to be disassembled and assembled, and the servo motor 6 is relatively heavy. Figure 3 As shown, the servo motor 6 is directly installed below the APC housing 7, and at least two people are required to disassemble and assemble the servo motor 6, which is inconvenient to operate, takes a long time to disassemble and assemble, and is prone to safety accidents.

[0042] like Figure 4As shown, the utility model realizes the lifting control of the lifting frame 4 by setting a retractable support structure 5, so that the parts that need to be installed or disassembled can be transported, thereby eliminating the need for manpower to lift heavy parts, improving the efficiency of transporting and disassembling parts, and at the same time improving the safety of transporting parts, avoiding the risk of disassembling parts falling due to careless manpower; at the same time, the connection structure 1 fixed on the support frame 2 can be used to achieve fixation with the APC housing 7, so that the servo motor 6 to be disassembled during the disassembly process can be limited to the position for disassembly, further avoiding displacement, shaking, etc. during the disassembly process, and improving the safety, reliability and convenience of disassembly; in addition, the retractable support structure 5 is set to pass through the bottom surface of the support frame 2 and connect with the bottom surface of the lifting frame 4, which also ensures the stability of the retractable support structure 5, and further improves the stability and safety of the disassembly process. The utility model can greatly improve the safety, stability and disassembly efficiency of the servo motor 6 for disassembly, which is conducive to improving the speed of equipment maintenance, and can also be applied to other work that requires manpower to disassemble and assemble and has heavy parts or complex disassembly processes, improve work efficiency, and reduce safety hazards.

[0043] In one embodiment, the end of the connection structure 1 that is not fixedly connected to the support frame 2 is a snap-fit ​​structure.

[0044] The utility model sets the end of the connection structure 1 that is not fixedly connected to the support frame 2 as a snap-on structure, so that the connection structure 1 can be used to detachably fix the outer shell or other fixed structure where the component to be disassembled is located with the support frame 2, so as to ensure that the disassembled component will not shift during the disassembly process, thereby improving the convenience and stability of disassembly.

[0045] In one embodiment, the support frame 2 includes a telescopic structure, and the telescopic structure is used to adjust the position of the connection structure 1. Preferably, the telescopic structure is located at the portion where the support frame 2 is connected to the connection structure 1, so as to realize the telescopic function while ensuring its supporting strength and reliability.

[0046] The utility model provides a supporting frame 2 including a telescopic structure, so that the auxiliary disassembly and assembly device can adapt to the disassembly and assembly positions of different components at different heights, thereby improving its use flexibility.

[0047] In one embodiment, the connection structure 1 is a cantilever snap-on structure, a torsion snap-on structure or an annular snap-on structure.

[0048] Specifically, the fixed connection structure can be reasonably set according to actual application needs to achieve a suitable and easy-to-use connection structure 1.

[0049] In one embodiment, Figure 1-Figure 2As shown, the support frame 2 includes three rectangular support sides 21 and a rectangular support bottom 22. The bottom edge of each support side 21 is respectively connected to a side edge of the support bottom 22, and the lengths of the bottom edge of the corresponding connected support side 21 and the side edge of the support bottom 22 are equal. The adjacent side edges of the three support sides 21 are sequentially connected to form a "C"-shaped side frame with an opening 10.

[0050] In one embodiment, as Figure 1-Figure 2 shown, the lifting frame 4 includes three rectangular lifting sides 41 and a rectangular lifting bottom 42. The bottom edge of each lifting side 41 is respectively connected to a side edge of the lifting bottom 42, and the lengths of the bottom edge of the corresponding connected lifting side 41 and the side edge of the lifting bottom 42 are equal. The adjacent side edges of the three lifting sides 41 are sequentially connected to form a "C"-shaped side frame with an opening 10.

[0051] The present utility model provides a support frame 2 and a lifting frame 4 including a "C"-shaped side frame with an opening 10. The opening 10 is used to put in or take out the parts to be disassembled and assembled. At the same time, maintenance personnel can confirm the position of the parts to be disassembled and assembled through the opening 10 of the side frame and can perform disassembly and assembly operations on the parts to be disassembled and assembled through this opening 10, thereby further improving the convenience of disassembly and assembly and being beneficial to further improving the efficiency of disassembly and assembly operations.

[0052] In one embodiment, as Figure 4 shown, the support side 21 and the support bottom 22 are of an integrally formed structure.

[0053] In one embodiment, the support side 21 and the support bottom 22 are of a structure in which discrete components are fixedly connected.

[0054] In one embodiment, as Figure 4 shown, the lifting side 41 and the lifting bottom 42 are of an integrally formed structure.

[0055] In one embodiment, the lifting side 41 and the lifting bottom 42 are of a structure in which discrete components are fixedly connected.

[0056] Specifically, the support frame 2 and the lifting frame 4 may also be other structural forms with a side opening 10 for carrying, observing, and operating on the parts to be disassembled and assembled, and their deformations are all within the protection scope of the present utility model.

[0057] In one embodiment, the material of the support frame 2 is stainless steel.

[0058] In one embodiment, the material of the lifting frame 4 is stainless steel.

[0059] The utility model avoids deformation of the support frame 2 and the lifting frame 4 by setting the materials of the support frame 2 and the lifting frame 4, thereby further improving the safety, reliability and stability of the disassembly and assembly auxiliary device.

[0060] In one embodiment, Figure 5 As shown, the telescopic support structure 5 includes a telescopic support shaft 51, a motor 53 and a motor switch 54, wherein the motor 53 is used to drive the telescopic support shaft 51 to extend and retract, and the motor switch 54 is used to control the switch of the motor 53; one end of the telescopic support shaft 51 is fixedly connected to the bottom surface of the lifting frame 4, and the other end of the telescopic support shaft 51 passes through the bottom surface of the support frame 2 and is connected to the motor 53, and the motor 53 is connected to the motor switch 54.

[0061] In one embodiment, Figure 6 The figure shows a partial enlarged view of the position of the disassembly and assembly auxiliary device on the telescopic support shaft 51 , and the telescopic support shaft 51 is surrounded by a bellows 52 on the outside.

[0062] In one embodiment, the bearing structure 3 is a sliding bearing.

[0063] In one embodiment, Figure 7 The figure shows a partial enlarged view of the position of the disassembly and assembly auxiliary device in the bearing structure 3. The bearing structure 3 is composed of more than two rollers 31 and a sliding track 32. The sliding track 32 is located at the position where the lifting frame 4 contacts the bearing structure 3, and the roller 31 is located in the sliding track 32.

[0064] Specifically, the utility model adopts a sliding bearing to achieve a slidable connection between the lifting frame 4 and the supporting frame 2. Other suitable methods may also be used to achieve a slidable connection, all of which are within the protection scope of the utility model.

[0065] In one embodiment, the bottom surface of the support frame 2 is fixed on a movable trolley.

[0066] In one embodiment, the method of using the disassembly auxiliary device to disassemble the servo motor 6 is as follows:

[0067] Move the movable trolley to move the disassembly and assembly auxiliary device to below the servo motor 6 to be disassembled;

[0068] Telescopically extend the telescopic structure of the support frame 2 so that the connection structure 1 of the support frame 2 reaches the position where the APC housing 7 where the servo motor 6 is installed is equipped with the corresponding connection structure 1;

[0069] The connection structure 1 of the support frame 2 is snap-connected with the connection structure 1 of the APC housing 7 to fix the position of the disassembly and assembly auxiliary device;

[0070] Turn on the motor switch 54, such as Figure 8 As shown, the motor 53 drives the telescopic support shaft 51 to stretch upward so that the bottom of the lifting frame 4 is at the bottom of the servo motor 6 (the movement direction 9 of the lifting frame 4 is upward), and the motor switch 54 is turned off to fix the telescopic support shaft 51 at the current position;

[0071] The installation structure of the servo motor 6 is disassembled from the opening 10 of the lifting frame 4 and the side frame of the support frame 2 until the servo motor 6 falls entirely on the second receiving bottom surface of the lifting frame 4;

[0072] Turn on the motor switch 54 again, as Fig. 9 As shown, the motor 53 drives the telescopic support shaft 51 to retract downward so that the bottom of the lifting frame 4 is at the bottom surface of the support frame 2 (the movement direction 9 of the lifting frame 4 is downward), so that the servo motor 6 falls to the bottom surface of the support frame 2;

[0073] The servo motor 6 is removed, and the connection structure 1 between the support frame 2 and the APC housing 7 is released to complete the disassembly of the servo motor 6 .

[0074] In one embodiment, the method of using the disassembly and assembly auxiliary device to install the servo motor 6 is as follows:

[0075] Move the movable trolley to move the disassembly and assembly auxiliary device with the servo motor 6 placed on the lifting frame 4 to below the APC housing 7 to be installed;

[0076] Telescopic structure of the support frame 2 is extended and retracted so that the connection structure 1 of the support frame 2 reaches the position where the APC housing 7 is equipped with the corresponding connection structure 1 (if the telescopic structure of the support structure can be snap-connected with the APC housing 7, there is no need to extend and retract the telescopic structure of the support frame 2);

[0077] The connection structure 1 of the support frame 2 is snap-connected with the connection structure 1 of the APC housing 7 to fix the position of the disassembly and assembly auxiliary device;

[0078] Turn on the motor switch 54, such as Fig.10 As shown, the motor 53 drives the telescopic support shaft 51 to retract downward so that the bottom surface of the lifting frame 4 is at the bottom of the support frame 2 (the movement direction 9 of the lifting frame 4 is downward), and the motor switch 54 is turned off to fix the telescopic support shaft 51 at the current position (if the telescopic support shaft 51 itself is in the position retracted at the bottom of the support frame 2, this operation is not required), and the servo motor 6 to be installed is placed on the placement table 42 of the lifting frame 4;

[0079] Turn on the motor switch 54, such as Fig.11 As shown, the motor 53 drives the telescopic support shaft 51 to stretch upward so that the lifting frame 4 with the servo motor 6 reaches the position to be installed (the movement direction 9 of the lifting frame 4 is upward), and the motor switch 54 is turned off to fix the telescopic support shaft 51 at the current position;

[0080] Install and fix the mounting structure of the servo motor 6;

[0081] Turn on the motor switch 54 again, and the motor 53 drives the telescopic support shaft 51 to retract downward to the bottom surface of the support frame 2;

[0082] The connection structure 1 between the support frame 2 and the APC housing 7 is released to complete the installation of the servo motor 6 .

[0083] Specifically, other components to be disassembled and assembled can also be disassembled and assembled using the disassembly and assembly auxiliary device in a similar manner as described above, and the configuration of the disassembly and assembly auxiliary device and the disassembly and assembly process can also be adjusted as needed.

[0084] To sum up, the disassembly and assembly auxiliary device of the utility model can be set up so that when disassembling the servo motor, there is no need for manpower to fix the heavy motor, thereby improving the disassembly efficiency, reducing the manpower and time required for disassembly, facilitating the rapid maintenance, and improving the recovery speed of the equipment. At the same time, it reduces the safety hazards of disassembly and improves the utilization rate of the equipment.

[0085] Therefore, the utility model effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0086] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A disassembly and assembly auxiliary device, characterized in that: The disassembly and assembly auxiliary device includes: a connection structure, a support frame, a bearing structure, a lifting frame, and a telescopic support structure; One end of the connection structure is fixedly connected to the support frame; the bottom surface of the lifting frame is used to place the object to be disassembled and assembled; the lifting frame is located within the support frame, the bearing structure is located between the lifting frame and the support frame, and the lifting frame is slidably connected to the support frame through the bearing structure; the telescopic support structure passes through the bottom surface of the support frame and is connected to the bottom surface of the lifting frame.

2. The disassembly and assembly auxiliary device according to claim 1, characterized in that: The end of the connection structure that is not fixedly connected to the support frame is a snap structure.

3. The disassembly and assembly auxiliary device according to claim 2, characterized in that: The support frame includes a telescopic structure for adjusting the position of the connection structure.

4. The disassembly and assembly auxiliary device according to claim 1, characterized in that: The support frame includes three rectangular support sides and a rectangular support bottom surface. The bottom edge of each support side is respectively connected to a side edge of the support bottom surface, and the lengths of the corresponding connected bottom edge of the support side and the side edge of the support bottom surface are equal. The adjacent side edges of the three support sides are sequentially connected to form a "C"-shaped side frame with an opening.

5. The disassembly and assembly auxiliary device according to claim 1, characterized in that: The lifting frame includes three rectangular lifting sides and a rectangular lifting bottom surface. The bottom edge of each lifting side is respectively connected to a side edge of the lifting bottom surface, and the lengths of the corresponding connected bottom edge of the lifting side and the side edge of the lifting bottom surface are equal. The adjacent side edges of the three lifting sides are sequentially connected to form a "C"-shaped side frame with an opening.

6. The disassembly and assembly auxiliary device according to claim 1, characterized in that: The material of the support frame is stainless steel.

7. The disassembly and assembly auxiliary device according to claim 1, characterized in that: The material of the lifting frame is stainless steel.

8. The disassembly and assembly auxiliary device according to claim 1, characterized in that: The telescopic support structure includes a telescopic support shaft, a motor, and a motor switch. The motor is used to drive the telescopic movement of the telescopic support shaft, and the motor switch is used to control the on / off of the motor; One end of the telescopic support shaft is fixedly connected to the bottom surface of the lifting frame, the other end of the telescopic support shaft passes through the bottom surface of the support frame and is connected to the motor, and the motor is connected to the motor switch.

9. The disassembly and assembly auxiliary device according to claim 1, characterized in that: The bearing structure is a sliding bearing.

10. The disassembly and assembly auxiliary device according to claim 1, characterized in that: The bearing structure is composed of two or more rollers and a sliding track. The sliding track is located at the position where the lifting frame contacts the bearing structure, and the rollers are located within the sliding track.

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