Adjustable superconducting linear magnetic levitation propulsion mechanism

Abstract

The invention relates to the technical field of superconducting magnetic levitation propulsion, and particularly discloses an adjustable superconducting linear magnetic levitation propulsion mechanism which comprises a moving mechanism, the moving mechanism comprises a propulsion guide rail and a moving carrier, an operation groove is formed in the propulsion guide rail, propulsion assemblies are arranged on the two side faces of the operation groove, and a bearing base table is fixedly installed on the upper surface of the operation groove; a lifting base is arranged on the bearing base table, a suspension assembly and an adjusting mechanism are arranged on the lifting base, the adjusting mechanism comprises a first linear motor arranged on the bearing base table, and a driving sliding block is slidably connected to the first linear motor; according to the device, the first linear motor is arranged on the bearing base table, the second linear motor is arranged below the moving carrier, the distance between the two lifting bases can be adjusted through sliding fit of the driving sliding block and the first linear motor, and when a curve is encountered, the first linear motor can be started to reduce the distance between the two lifting bases; therefore, the flexibility of the mobile carrier during turning is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of superconducting magnetic levitation propulsion, and in particular relates to an adjustable superconducting linear magnetic levitation propulsion mechanism. Background Art

[0002] Magnetic levitation propulsion is an advanced technology that uses magnetic field interaction to achieve object suspension and propulsion. It is widely used in maglev trains, ship propulsion, aerospace and other fields. Its principle is mainly based on the interaction of magnetic fields in electromagnetism, including the generation of suspension force and the realization of propulsion force. The core of magnetic levitation is to use the interaction of magnetic fields to suspend objects in the air, thereby eliminating mechanical contact and friction. High-temperature superconducting magnetic levitation is a technology that uses the magnetic levitation phenomenon of high-temperature superconducting materials in a magnetic field to achieve object suspension. The core of high-temperature superconducting magnetic levitation lies in the magnetic flux pinning characteristics of superconducting materials. When a superconductor enters a magnetic field, the magnetic lines of force will be "pinned" in the impurities inside the superconductor, forming a stable suspension force. This characteristic makes high-temperature superconducting magnetic levitation have the excellent characteristics of self-stabilization, self-suspension, and self-guiding, without the need for external suspension and guidance control systems. Compared with traditional magnetic levitation technology, high-temperature superconducting magnetic levitation technology can achieve suspension without power supply, and the suspension height can reach ten to twenty millimeters. In addition, this technology relies on the magnetic flux pinning characteristics of superconducting materials, so there is no need for additional control of suspension and guidance. At the same time, this technology only needs to use liquid nitrogen to cool the superconductor during operation, and the operating cost is low. High-temperature superconducting magnetic levitation technology has shown great application potential in the field of transportation due to its advantages such as self-stabilization suspension, low energy consumption, and high safety. With the breakthrough of material technology and the advancement of engineering applications, high-temperature superconducting magnetic levitation is expected to become an important mode of transportation in the future;

[0003] According to the patent with publication number CN 111746293 A, a high-temperature superconducting magnetic levitation propulsion system is proposed, which includes a vehicle body and a track. A vehicle-mounted levitation magnet is arranged at the bottom of the vehicle body, and the vehicle-mounted levitation magnet is fixedly connected to the vehicle body. The vehicle-mounted levitation magnet includes a high-temperature superconducting tape, and a plurality of high-temperature superconducting tapes are stacked. The track is fixedly arranged on the ground, and a permanent magnet track is arranged on the track. The permanent magnet track corresponds to the vehicle-mounted levitation magnet to realize the levitation and guidance of the vehicle body. The high-temperature superconducting magnetic levitation propulsion system of the present invention has a simple and ingenious structure. The levitation magnet is not a traditional high-temperature superconducting block material but a high-temperature superconducting tape. The high-temperature superconducting tape captures magnetic flux more uniformly, and the vibration amplitude of the train operation is small. The stacked high-temperature superconducting tapes have a simple fixing process, and the high-temperature superconducting tapes can be stacked in different directions as needed, which greatly facilitates the design of the superconducting levitation magnet and meets the specific requirements of the levitation force and the guiding force.

[0004] When traditional high-temperature superconducting magnetic suspension mechanisms deal with curves, the positioning mechanism on the track cannot be adjusted, and thus cannot turn flexibly, resulting in a large loss of speed.

[0005] To this end, those skilled in the art have proposed an adjustable superconducting linear magnetic levitation propulsion mechanism to solve the problems raised by the background technology.

[0006] The above information disclosed in this background technology is only used to increase the understanding of the background technology of the present invention and therefore, it may include information that does not constitute the prior art known to a person of ordinary skill in the art. Summary of the invention

[0007] The purpose of the present invention is to provide an adjustable superconducting linear maglev propulsion mechanism to solve the problem that when a traditional high-temperature superconducting maglev mechanism is dealing with a curve, its positioning mechanism on the track cannot be adjusted and thus cannot be flexibly turned, resulting in a large speed loss.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] An adjustable superconducting linear magnetic levitation propulsion mechanism, comprising:

[0010] A moving mechanism, the moving mechanism comprising a propulsion guide rail and a moving carrier, the propulsion guide rail is provided with a running groove, the cross-sectional shape of the propulsion guide rail is a concave shape, the moving carrier is located in the running groove, both sides of the running groove are provided with propulsion components, a bearing base is fixedly installed on the upper surface of the running groove, a lifting base is provided on the bearing base, a suspension component is provided on the lifting base, and the number of the lifting bases is two;

[0011] The adjusting mechanism comprises a first linear motor arranged on a supporting base, an active slider being slidably connected to the first linear motor, two active sliders being in number, the two active sliders being respectively connected to two lifting bases, a movable shaft being arranged on the upper surface of the lifting base, the end of the movable shaft away from the lifting base being connected to a guide rail limit seat, the guide rail limit seat being movably cooperated with the lifting base through a movable shaft, a second linear motor being arranged on the lower surface of the movable carrier, a follower slider being slidably connected to the second linear motor, two follower sliders being in number, positioning platforms being arranged on the two follower sliders, the lower surface of the positioning platform being slidably connected to a lifting positioning guide rail.

[0012] Preferably, a slot is provided on the guide rail limiting seat, the lifting and positioning guide rail is located in the slot, the lifting and positioning guide rail is suspended in the slot, and the lifting and positioning guide rail is in a non-contact state with the two side surfaces inside the slot.

[0013] Preferably, the number of the guide rail limiting seats is two, and the first hinge and the second hinge are fixedly mounted on the two guide rail limiting seats respectively.

[0014] Preferably, a telescopic cylinder is hinged on the second hinge, one end of the telescopic cylinder includes a telescopic shaft, the telescopic shaft is slidably matched with the telescopic cylinder, and one end of the telescopic shaft is hinged to the first hinge.

[0015] Preferably, the suspension assembly includes a track linear motor arranged on a supporting base, the track linear motor includes an electromagnetic coil fixedly mounted on a lifting base and a high-temperature superconducting magnet assembly fixedly mounted on a lower surface of a mobile carrier, and the high-temperature superconducting magnet assembly is located above the electromagnetic coil.

[0016] Preferably, the propulsion assembly includes stator coils arranged on both sides of the running slot and mover coils fixedly mounted on both sides of the moving carrier.

[0017] Preferably, the stator coil is connected to a three-phase alternating current, and the stator coil is used to control the magnitude of the input current through a power electronic component.

[0018] Preferably, the mover coil is a magnet with north and south poles alternately arranged.

[0019] Preferably, the cross-sectional shape of the lifting and positioning guide rail is a convex shape, and damping is provided between the positioning platform and the lifting and positioning guide rail.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The present invention arranges a first linear motor on the supporting base and a second linear motor under the mobile carrier, so that the distance between the two lifting bases can be adjusted by the sliding cooperation between the active slider and the first linear motor. When encountering a curve, the first linear motor can be started to shorten the distance between the two lifting bases, thereby improving the flexibility of the mobile carrier when turning and reducing the speed lost in the curve.

[0022] (2) The present invention provides a suspension assembly with an electromagnetic coil and a high-temperature superconducting magnet assembly. Liquid nitrogen is used to allow the superconducting material to enter a superconducting state when the temperature is below the critical temperature. When the superconductor is close to the magnetic field, a magnetic field opposite to the external magnetic field is generated inside the superconductor, thereby generating a suspension force. At the same time, when current is passed through the stator coil on the propulsion guide rail, a moving magnetic field is generated. This moving magnetic field interacts with the mover coil on the mobile carrier, thereby generating an Ampere force, thereby pushing the mobile carrier forward. The power electronic components are used to control the input current, thereby increasing or decreasing the current in the stator coil, thereby increasing or decreasing the magnetic field strength. A stronger magnetic field will increase the propulsion force of the mobile carrier, thereby achieving acceleration. Conversely, the mobile carrier can be decelerated by weakening the magnetic field.

[0023] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present invention will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a front perspective structural schematic diagram of the present invention;

[0025] Figure 2 It is a schematic diagram of the internal structure of the processing chamber of the present invention;

[0026] Figure 3 It is a schematic diagram of the cross-sectional structure of the adjustment plate of the present invention;

[0027] Figure 4 It is a rear-view stereoscopic structural schematic diagram of the present invention;

[0028] Figure 5 It is an enlarged schematic diagram of the local structure at A of the present invention;

[0029] Figure 6 It is a schematic diagram of the three-dimensional structure when viewed from above of the present invention.

[0030] In the figure: 1. Propulsion guide rail; 2. Moving carrier; 3. Propulsion assembly; 4. Suspension assembly; 5. Lifting base; 6. Positioning platform; 7. Lifting and positioning guide rail; 8. Movable shaft; 9. Guide rail limit seat; 10. Slot; 12. Second linear motor; 13. First hinge; 14. Second hinge; 15. Telescopic shaft; 16. Telescopic cylinder; 17. Running groove; 18. Stator coil; 19. Mover coil; 22. Track linear motor; 26. Electromagnetic coil; 27. High-temperature superconducting magnet assembly; 28. Carrying base; 29. ​​First linear motor; 30. Active slider. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Embodiment 1:

[0033] See also Figure 1-Figure 6 As shown, an adjustable superconducting linear magnetic levitation propulsion mechanism comprises:

[0034] The moving mechanism includes a propulsion guide rail 1 and a moving carrier 2. The propulsion guide rail 1 is provided with a running groove 17. The cross-sectional shape of the propulsion guide rail 1 is a concave shape. The moving carrier 2 is located in the running groove 17. Both sides of the running groove 17 are provided with propulsion components 3. A bearing base 28 is fixedly installed on the upper surface of the running groove 17. A lifting base 5 is provided on the bearing base 28. A suspension component 4 is provided on the lifting base 5. There are two lifting bases 5.

[0035] The adjustment mechanism includes a first linear motor 29 arranged on a supporting base 28, an active slider 30 is slidably connected to the first linear motor 29, there are two active sliders 30, the two active sliders 30 are respectively connected to the two lifting bases 5, a movable shaft 8 is arranged on the upper surface of the lifting base 5, the end of the movable shaft 8 away from the lifting base 5 is connected to a guide rail limit seat 9, the guide rail limit seat 9 is movably cooperated with the lifting base 5 through the movable shaft 8, a second linear motor 12 is arranged on the lower surface of the mobile carrier 2, a follower slider is slidably connected to the second linear motor 12, there are two follower sliders, positioning tables 6 are arranged on the two follower sliders, and a lifting positioning guide rail 7 is slidably connected to the lower surface of the positioning table 6.

[0036] Specifically, a slot 10 is formed on the guide rail limiting seat 9, the lifting and positioning guide rail 7 is located in the slot 10, the lifting and positioning guide rail 7 is suspended in the slot 10, and the lifting and positioning guide rail 7 is in a non-contact state with the two side surfaces inside the slot 10.

[0037] As can be seen from the above, the device is capable of adjusting the distance between the two lifting bases 5 by slidingly cooperating between the active slider 30 and the first linear motor 29 by arranging a first linear motor 29 on the supporting base 28 and a second linear motor 12 under the mobile carrier 2. When encountering a curve, the first linear motor 29 can be started to shorten the distance between the two lifting bases 5, thereby improving the flexibility of the mobile carrier 2 when turning and reducing its speed loss at the curve.

[0038] Embodiment 2:

[0039] See also Figure 1-Figure 6 As shown, the moving mechanism includes a propulsion guide rail 1 and a moving carrier 2. The propulsion guide rail 1 is provided with a running groove 17. The cross-sectional shape of the propulsion guide rail 1 is a concave shape. The moving carrier 2 is located in the running groove 17. Both sides of the running groove 17 are provided with propulsion components 3. A bearing base 28 is fixedly installed on the upper surface of the running groove 17. A lifting base 5 is provided on the bearing base 28. A suspension component 4 is provided on the lifting base 5. The number of the lifting bases 5 is two;

[0040] The adjustment mechanism includes a first linear motor 29 arranged on a supporting base 28, and an active slider 30 is slidably connected to the first linear motor 29. There are two active sliders 30, and the two active sliders 30 are respectively connected to the two lifting bases 5. A movable shaft 8 is arranged on the upper surface of the lifting base 5, and the end of the movable shaft 8 away from the lifting base 5 is connected to a guide rail limit seat 9. The guide rail limit seat 9 is movably cooperated with the lifting base 5 through the movable shaft 8. A second linear motor 12 is arranged on the lower surface of the mobile carrier 2, and a follower slider is slidably connected to the second linear motor 12. There are two follower sliders, and positioning platforms 6 are arranged on the two follower sliders. The lower surface of the positioning platform 6 is slidably connected to a lifting positioning guide rail 7.

[0041] Specifically, there are two guide rail limiting seats 9 , and the first hinge 13 and the second hinge 14 are fixedly mounted on the two guide rail limiting seats 9 , respectively.

[0042] Specifically, a telescopic cylinder 16 is hinged on the second hinge 14 , one end of the telescopic cylinder 16 includes a telescopic shaft 15 , the telescopic shaft 15 is slidably matched with the telescopic cylinder 16 , and one end of the telescopic shaft 15 is hinged to the first hinge 13 .

[0043] Specifically, the suspension assembly 4 includes a track linear motor 22 arranged on a supporting base 28, the track linear motor 22 includes an electromagnetic coil 26 fixedly mounted on a lifting base 5 and a high-temperature superconducting magnet assembly 27 fixedly arranged on the lower surface of the mobile carrier 2, and the high-temperature superconducting magnet assembly 27 is located above the electromagnetic coil 26.

[0044] Specifically, the propulsion assembly 3 includes a stator coil 18 disposed on two side surfaces of the running slot 17 and a mover coil 19 fixedly mounted on two side surfaces of the moving carrier 2 .

[0045] As can be seen from the above, the device is provided with a suspension component 4 with an electromagnetic coil 26 and a high-temperature superconducting magnet component 27, and liquid nitrogen is used to allow the superconducting material to enter a superconducting state when the temperature is below the critical temperature. When the superconductor is close to the magnetic field, a magnetic field opposite to the external magnetic field is generated inside the superconductor, thereby generating a suspension force. At the same time, when current is passed through the stator coil 18 on the propulsion rail 1, a moving magnetic field is generated. This moving magnetic field interacts with the mover coil 19 on the mobile carrier 2, thereby generating an Ampere force, which can propel the mobile carrier 2 forward.

[0046] Embodiment three:

[0047] See also Figure 1-Figure 6As shown, the moving mechanism includes a propulsion guide rail 1 and a moving carrier 2. The propulsion guide rail 1 is provided with a running groove 17. The cross-sectional shape of the propulsion guide rail 1 is a concave shape. The moving carrier 2 is located in the running groove 17. Both sides of the running groove 17 are provided with propulsion components 3. A bearing base 28 is fixedly installed on the upper surface of the running groove 17. A lifting base 5 is provided on the bearing base 28. A suspension component 4 is provided on the lifting base 5. The number of the lifting bases 5 is two;

[0048] The adjustment mechanism includes a first linear motor 29 arranged on a supporting base 28, and an active slider 30 is slidably connected to the first linear motor 29. There are two active sliders 30, and the two active sliders 30 are respectively connected to the two lifting bases 5. A movable shaft 8 is arranged on the upper surface of the lifting base 5, and the end of the movable shaft 8 away from the lifting base 5 is connected to a guide rail limit seat 9. The guide rail limit seat 9 is movably matched with the lifting base 5 through the movable shaft 8. A second linear motor 12 is arranged on the lower surface of the mobile carrier 2, and a follower slider is slidably connected to the second linear motor 12. There are two follower sliders, and positioning platforms 6 are arranged on the two follower sliders. A lifting positioning guide rail 7 is slidably connected to the lower surface of the positioning platform 6, and the lifting positioning guide rail 7 is slidably matched with the guide rail limit seat 9.

[0049] Specifically, the stator coil 18 is connected to the three-phase alternating current, and the stator coil 18 is used to control the input current through power electronic components.

[0050] Specifically, the mover coil 19 is a magnet with north and south poles arranged alternately.

[0051] Specifically, the cross-sectional shape of the lifting and positioning guide rail 7 is a convex shape, and there is damping between the positioning platform 6 and the lifting and positioning guide rail 7 .

[0052] As can be seen from the above, the device uses power electronic components to control the input current, thereby increasing or decreasing the current in the stator coil 18, thereby increasing or decreasing the magnetic field strength. A stronger magnetic field will increase the propulsion force of the mobile carrier 2, thereby achieving acceleration. Conversely, the mobile carrier 2 can be decelerated by weakening the magnetic field.

[0053] The standard parts used in the present invention can all be purchased from the market, and the special-shaped parts can be customized according to the description and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0054] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0055] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0057] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0058] In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0059] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An adjustable superconducting linear magnetic levitation propulsion mechanism, characterized in that: include: A mobile mechanism, the mobile mechanism comprising a propulsion guide rail (1) and a mobile carrier (2), the propulsion guide rail (1) being provided with a running groove (17), the cross-sectional shape of the propulsion guide rail (1) being a concave shape, the mobile carrier (2) being located in the running groove (17), both sides of the running groove (17) being provided with propulsion components (3), the upper surface of the running groove (17) being fixedly mounted with a bearing base (28), the bearing base (28) being provided with a lifting base (5), the lifting base (5) being provided with a suspension component (4), and the number of the lifting bases (5) being two; An adjustment mechanism, wherein the adjustment mechanism comprises a first linear motor (29) arranged on a supporting base (28), an active slider (30) being slidably connected to the first linear motor (29), the number of the active sliders (30) being two, the two active sliders (30) being respectively connected to two lifting bases (5), a movable shaft (8) being arranged on the upper surface of the lifting base (5), the end of the movable shaft (8) away from the lifting base (5) being connected to a guide rail limit seat (9), the guide rail limit seat (9) being movably matched with the lifting base (5) via the movable shaft (8), a second linear motor (12) being arranged on the lower surface of the movable carrier (2), a follower slider being slidably connected to the second linear motor (12), the number of the follower sliders being two, a positioning platform (6) being arranged on each of the two follower sliders, the lower surface of the positioning platform (6) being slidably connected to a lifting positioning guide rail (7).

2. The adjustable superconducting linear magnetic levitation propulsion mechanism according to claim 1, characterized in that: The guide rail limiting seat (9) is provided with a slot (10), the lifting and positioning guide rail (7) is located in the slot (10), the lifting and positioning guide rail (7) is suspended in the slot (10), and the lifting and positioning guide rail (7) and the two side surfaces inside the slot (10) are in a non-contact state.

3. The adjustable superconducting linear magnetic levitation propulsion mechanism according to claim 1, characterized in that: The number of the guide rail limiting seats (9) is two, and a first hinge (13) and a second hinge (14) are respectively fixedly mounted on the two guide rail limiting seats (9).

4. The adjustable superconducting linear magnetic levitation propulsion mechanism according to claim 3, characterized in that: A telescopic cylinder (16) is hingedly connected to the second hinge (14), one end of the telescopic cylinder (16) includes a telescopic shaft (15), the telescopic shaft (15) and the telescopic cylinder (16) are slidably matched, and one end of the telescopic shaft (15) is hingedly connected to the first hinge (13).

5. The adjustable superconducting linear magnetic levitation propulsion mechanism according to claim 1, characterized in that: The suspension assembly (4) comprises a track linear motor (22) arranged on a bearing base (28), the track linear motor (22) comprises an electromagnetic coil (26) fixedly mounted on a lifting base (5) and a high-temperature superconducting magnet assembly (27) fixedly arranged on the lower surface of the mobile carrier (2), and the high-temperature superconducting magnet assembly (27) is located above the electromagnetic coil (26).

6. The adjustable superconducting linear magnetic levitation propulsion mechanism according to claim 1, characterized in that: The propulsion assembly (3) comprises a stator coil (18) arranged on two side surfaces of the running slot (17) and a mover coil (19) fixedly mounted on two side surfaces of the moving carrier (2).

7. The adjustable superconducting linear magnetic levitation propulsion mechanism according to claim 6, characterized in that: The stator coil (18) is connected to a three-phase alternating current, and the stator coil (18) is used to control the magnitude of the input current through a power electronic component.

8. The adjustable superconducting linear magnetic levitation propulsion mechanism according to claim 7, characterized in that: The mover coil (19) is a magnet with north and south poles arranged alternately, and the mover coil (19) is a racetrack-shaped coil.

9. The adjustable superconducting linear magnetic levitation propulsion mechanism according to claim 1, characterized in that: The cross-sectional shape of the lifting and positioning guide rail (7) is a convex shape, and damping is provided between the positioning platform (6) and the lifting and positioning guide rail (7).

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