Driving system and straightway accelerated loading test equipment

Abstract

The utility model provides a driving system and straightway accelerated loading test equipment. The driving system comprises two groups of loading circular rails which are horizontally fixed on a rack at intervals, transmission chains which are respectively and correspondingly connected to the two groups of loading circular rails, a plurality of loading vehicles which are circumferentially connected to the two groups of transmission chains at intervals, and two groups of linear motors, guide supporting wheels which are in rolling connection with the loading circular track are arranged on the two sides of the loading vehicle; the loading circular track is provided with two straight line segments which are parallel up and down, and the two groups of linear motors are fixed on the rack corresponding to the two straight line segments respectively; secondary induction aluminum plates are fixedly connected to each chain link of the transmission chain and the two sides of the loading vehicle; the secondary induction aluminum plate is used for stretching into a primary coil air gap of the linear motor to obtain driving force, and the transmission chain drives the loading vehicle to do one-way circulating motion along the loading circular track under the action of the driving force. According to the driving system and the straightway accelerated loading test equipment provided by the utility model, the structure of the driving system can be simplified, and the running speed and the stability of a straightway accelerated loading test are improved.

Description

Technical Field

[0001] This utility model belongs to the field of road performance testing technology, specifically relating to a drive system and straight-line accelerated loading test equipment. Background Technology

[0002] The straight-line accelerated loading test equipment is used to comprehensively simulate the actual service conditions of road materials and structures in special geographical environments, simulate different vehicle axle load compositions, and conduct scientific research on accelerated loading tests of new structures, new materials and new processes using full-scale tests.

[0003] There are two main operating modes for existing straight-track accelerated loading test equipment. One mode involves a drive mechanism that drives the loading vehicle in a linear reciprocating motion, while the other mode involves a drive mechanism that drives the loading vehicle to move cyclically along a circular track, using the straight sections of the circular track to allow the loading vehicle to roll over the road surface to complete the test simulation. Linear reciprocating motion has significant drawbacks in terms of loading continuity. Circular track motion typically uses a motor to drive the loading vehicle, which in turn drives a chain connecting multiple loading vehicles to rotate along the track for continuous operation. This drive method has limited driving force and poor stability, making it difficult to meet the requirements of high-speed test operation. Furthermore, the motor requires power from slip rings and an external power grid, which complicates the structure of the drive system. Utility Model Content

[0004] This utility model provides a drive system and straight-track accelerated loading test equipment, which aims to improve the running speed and stability of straight-track accelerated loading tests and simplify the structural complexity of the drive system.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: Firstly, a drive system is provided, comprising two sets of loading ring rails fixed horizontally at intervals on a frame, transmission chains respectively connected to the two sets of loading ring rails, multiple loading vehicles circumferentially connected to the two sets of transmission chains, and two sets of linear motors; each side of the loading vehicle is provided with guide support wheels that are rolled and connected to the loading ring rails; the loading ring rails have two parallel straight segments, and the two sets of linear motors are fixed to the frame corresponding to the two straight segments respectively; each link of the transmission chain and both sides of the loading vehicle are fixedly connected with a secondary induction aluminum plate; the secondary induction aluminum plate is used to extend into the air gap of the primary coil of the linear motor to obtain driving force, and the transmission chain drives the loading vehicle to move unidirectionally along the loading ring rails under the action of driving force.

[0006] In conjunction with the first aspect, in one possible implementation, the loading ring rail includes an inner ring guide rail and an outer ring guide rail, with an annular raceway formed between the inner and outer ring guide rails; each link is connected to a guide support wheel identical to those on both sides of the loading vehicle, and each guide support wheel is tactilely connected to the annular raceway.

[0007] In some embodiments, the guide support wheel includes an inner wheel body and an outer wheel body coaxially connected; wherein the inner wheel body is rolled on an inner ring guide rail, and the outer wheel body is rolled on an outer ring guide rail.

[0008] For example, the linear motor is fixed to the outside of two sets of loading ring rails, and each induction aluminum plate extends into the air gap of the primary coil through the annular raceway between adjacent guide support wheels.

[0009] For example, the linear motor is fixed to the frame by a motor bracket. The motor bracket includes a carrier plate and multiple support ribs. Each support rib is distributed at intervals on the underside of the carrier plate along the extension direction of the straight segment, and each support rib is fixedly connected to the frame.

[0010] In some embodiments, each set of linear motors includes multiple linear motors spaced apart along the extension direction of the straight segment. Each linear motor includes an upper body, a lower body, and a U-shaped fixing frame. The opening of the fixing frame faces between the two sets of loading ring rails. The upper body and the lower body are respectively connected to the upper and lower sides of the fixing frame and form a primary coil air gap between them. The fixing frame is fixedly connected to the carrier plate.

[0011] In some embodiments, the upper surface of the carrier plate is provided with a positioning groove, and the fixing bracket is embedded in the positioning groove and fixedly connected to the carrier plate.

[0012] For example, an adjusting shim is provided between the fixing bracket and the bottom of the positioning groove.

[0013] In one possible implementation, a chain shaft connects the corresponding links of the two sets of drive chains, and guide support wheels are connected to both ends of the chain shaft.

[0014] The beneficial effects of the drive system provided by this utility model are as follows: Compared with the prior art, the drive system of this utility model has a set of linear motors fixedly installed on the frame for each of the two straight sections of the loading slide rail. At the same time, secondary induction aluminum plates are installed on each link of the transmission chain and both sides of the loading vehicle. When the linear motor is energized, the secondary induction aluminum plates that extend into the air gap of its primary coil obtain driving force and drive the transmission chain to move along the loading slide rail. This allows the loading vehicles arranged at intervals on the two sets of transmission chains to cyclically roll the test surface located below the straight section in turn. Since each link of the straight section and the secondary induction aluminum plates fixed on the loading vehicle can be electromagnetically coupled with the primary coil of the linear motor to obtain driving force, the driving force of the unidirectional cyclic motion of the transmission chain can be improved. This not only improves the running speed of the linear acceleration loading test, but also improves the driving stability of the transmission chain, thereby improving the running stability of the linear acceleration loading test. In addition, the linear motors are fixedly installed on the frame and can be directly connected to the power supply line for power supply. Compared with the slip ring power supply method, this method is not only simple in structure, but also has high stability.

[0015] Secondly, this utility model embodiment also provides a straight-track accelerated loading test equipment, including the above-mentioned drive system.

[0016] The beneficial effects of the straight-track accelerated loading test equipment provided by this utility model are as follows: Compared with the prior art, the straight-track accelerated loading test equipment of this utility model adopts the above-mentioned drive system. Each link of the chain passing through the straight section and the secondary induction aluminum plate fixed on the loading vehicle can be electromagnetically coupled with the primary coil of the linear motor to obtain driving force, thereby improving the overall driving force of the unidirectional cyclic motion of the transmission chain. This not only improves the running speed of the linear accelerated loading test, but also improves the driving stability of the transmission chain, thereby improving the running stability of the linear accelerated loading test. The linear motor is fixed to the frame and can be directly connected to the power supply line for power supply. Compared with the slip ring power supply method, it is not only simple in structure, but also has high stability. Attached Figure Description

[0017] Figure 1 A three-dimensional structural schematic diagram of the drive system provided in an embodiment of this utility model;

[0018] Figure 2 For along Figure 1 Schematic diagram of the cross-sectional structure along line AA;

[0019] Figure 3 This is a three-dimensional structural diagram of the loading ring track and loading vehicle in an embodiment of this utility model;

[0020] Figure 4 This is a schematic diagram of the main structure of the loading ring track used in the embodiment of this utility model;

[0021] Figure 5 This is a three-dimensional structural diagram of the linear motor used in the embodiments of this utility model;

[0022] Figure 6 This is a three-dimensional structural diagram of two links of the transmission chain used in this embodiment of the utility model;

[0023] Figure 7 This is a three-dimensional structural diagram of the loading vehicle in an embodiment of this utility model;

[0024] Figure 8 for Figure 5 A magnified schematic diagram of the structure at point B in the middle.

[0025] In the diagram: 10. Loading ring rail; 100. Annular raceway; 11. Inner ring guide rail; 12. Outer ring guide rail; 20. Transmission chain; 30. Loading cart; 40. Linear motor; 400. Primary coil air gap; 41. Upper body; 42. Lower body; 43. Fixing frame; 50. Guide support wheel; 51. Inner wheel body; 52. Outer wheel body; 53. Chain shaft; 60. Secondary induction aluminum plate; 70. Motor bracket; 71. Carrier plate; 711. Positioning groove; 72. Support rib; 73. Adjusting shim; 80. Frame. Detailed Implementation

[0026] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] It should be noted that when an element is referred to as being "set on" another element, it can be directly on or indirectly on the other element. It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0028] Please refer to the following: Figures 1 to 8The drive system provided by this utility model will now be described. The drive system includes two sets of loading ring rails 10 fixed horizontally at intervals on the frame 80, transmission chains 20 respectively connected to the two sets of loading ring rails 10, multiple loading carts 30 circumferentially connected to the two sets of transmission chains 20, and two sets of linear motors 40; both sides of the loading carts 30 are provided with guide support wheels 50 that are rolled and connected to the loading ring rails 10; the loading ring rails 10 have two vertically parallel straight segments, and the two sets of linear motors 40 are fixed to the frame 80 respectively corresponding to the two straight segments; each link of the transmission chain 20 and both sides of the loading carts 30 are fixedly connected with secondary induction aluminum plates 60; the secondary induction aluminum plates 60 are used to extend into the air gap 400 of the primary coil of the linear motors 40 to obtain driving force, and the transmission chains 20 drive the loading carts 30 to move unidirectionally along the loading ring rails 10 under the action of driving force.

[0029] First, it needs to be explained that the linear motor 40 is an electric transmission device that directly converts electrical energy into linear motion mechanical energy. It has advantages such as simple structure, fast response speed, large acceleration, and high positioning accuracy. The working principle of the linear motor 40 is based on the law of electromagnetic induction. When three-phase alternating current passes through the stator winding (i.e., the primary induction coil) of the linear motor 40, a traveling wave magnetic field is generated. The mover part (i.e., the secondary induction aluminum plate 60) is made of magnetically conductive material. When the traveling wave magnetic field interacts with the mover, an induced electromotive force and current are generated on the mover. According to the law of electromagnetic force, the induced current is subjected to an electromagnetic force in the magnetic field, and this electromagnetic force drives the mover to move linearly. By controlling parameters such as the frequency, phase, and amplitude of the alternating current input to the stator winding, the speed and direction of the traveling wave magnetic field can be adjusted, thereby achieving precise control of the speed and direction of the mover.

[0030] In this embodiment, the linear motor 40 can be specifically understood as the stator winding portion, while the induction aluminum plate serves as the mover portion. Based on this, the primary coil air gap 400 can be understood as the gap between the upper and lower sets of primary coils. This gap allows the secondary induction aluminum plate 60 to extend without contacting the primary induction coil, and to form air gaps of approximately the same size between the upper and lower surfaces of the secondary induction aluminum plate 60 and the upper and lower sets of primary coils, respectively. The use of an aluminum secondary induction aluminum plate 60 as the mover portion is based on two considerations: firstly, the good conductivity of aluminum allows for a strong induced current under the magnetic field generated by the primary coil, thus generating a larger electromagnetic driving force; secondly, the excellent heat dissipation performance of aluminum reduces the heat dissipation difficulty during the operation of the linear motor 40; and thirdly, aluminum plates are low-cost and easy to process, which helps control the cost of the drive system.

[0031] It should be noted that in this embodiment, the loading ring rail 10 serves two purposes: firstly, to provide running guidance for the transmission chain 20, and secondly, to provide support for the loading vehicle 30. Specifically, the guide support wheels 50 on both sides of the loading vehicle 30 are connected to two sets of loading ring rails 10 respectively. When the loading vehicle 30 travels with the transmission chain 20 to the straight section below, it can roll onto the test road surface. At this time, the loading ring rail 10 fixed to the frame 80 provides a reaction force to the loading vehicle 30 through the guide support wheels 50, thereby ensuring that the loading force of the loading vehicle 30 on the test road surface meets the requirements.

[0032] Compared with the prior art, the drive system provided in this embodiment has a set of linear motors 40 fixedly installed on the frame 80 for each of the two straight sections of the loading slide rail. Simultaneously, secondary induction aluminum plates 60 are installed on each link of the transmission chain 20 and on both sides of the loading vehicle 30. When the linear motor 40 is energized, the secondary induction aluminum plates 60 extending into the air gap 400 of its primary coil obtain driving force, driving the transmission chain 20 to move along the loading slide rail. This allows the loading vehicles 30, spaced apart on the two sets of transmission chains 20, to sequentially and cyclically roll the test road surface located below the straight section. Due to the straight section... Each link of the chain and the secondary induction aluminum plate 60 fixed on the loading vehicle 30 can electromagnetically couple with the primary coil of the linear motor 40 to obtain driving force. Therefore, it can improve the driving force of the unidirectional cyclic motion of the transmission chain 20, which can not only improve the running speed of the linear acceleration loading test, but also improve the driving stability of the transmission chain 20, thereby improving the running stability of the linear acceleration loading test. In addition, the linear motor 40 is fixedly installed on the frame 80 and can be directly connected to the power supply line for power supply. Compared with the slip ring power supply method, it is not only simple in structure, but also has high stability.

[0033] As one specific implementation of the aforementioned loading ring rail 10, please refer to Figures 2 to 4The loading ring rail 10 includes an inner ring guide rail 11 and an outer ring guide rail 12, forming an annular raceway 100 between the inner ring guide rail 11 and the outer ring guide rail 12. Each link is connected to a guide support wheel 50 identical to those on both sides of the loading vehicle 30, and each guide support wheel 50 is tactilely connected to the annular raceway 100. Since the loading ring rail 10 needs to provide a reaction force to the loading vehicle 30 during the loading test to ensure the loading force of the loading vehicle 30 on the test road surface, the loading ring rail 10 adopts a structure of inner ring guide rail 11 and outer ring guide rail 12 combined to form the annular raceway 100. This allows the inner ring guide rail 11 and outer ring guide rail 12 to simultaneously provide support force to the guide support wheels 50. On the one hand, when the loading vehicle 30 travels to the lower straight section, the inner ring guide rail 11 can provide a downward reaction force to the guide support wheels 50 of the loading vehicle 30, thereby ensuring the loading force of the loading vehicle 30 on the test road surface. On the other hand… On the one hand, the inner ring guide rail 11 and the outer ring guide rail 12, together with the constraint guide support wheel 50, can also improve the running stability of the transmission chain 20 and the loading vehicle 30. On this basis, by installing guide support wheels 50 on each link and cooperating with the annular raceway 100, the running stability of the transmission chain 20 can be further improved. In addition, the guide support wheels 50 fixed on the links near the loading vehicle 30 can provide auxiliary support for the loading vehicle 30, which helps to reduce the local stress concentration of the inner ring guide rail 11, thereby improving the running stability and the service life of the annular raceway 100.

[0034] For some possible implementations, please refer to [link / reference]. Figure 2 , Figure 6 and Figure 7 The guide support wheel 50 includes an inner wheel body 51 and an outer wheel body 52 coaxially connected; wherein, the inner wheel body 51 rolls on the inner ring guide rail 11, and the outer wheel body 52 rolls on the outer ring guide rail 12. Since the relative movement directions of the guide support wheel 50 with the inner ring guide rail 11 and the outer ring guide rail 12 are different, the guide support wheel 50 is configured as two inner wheel bodies 51 and outer wheel bodies 52 that can rotate independently of each other. When the loading vehicle 30 travels along the annular raceway 100, the inner wheel body 51 rolls on the inner ring guide rail 11 and rotates clockwise, while the outer wheel body 52 rolls on the outer ring guide rail 12 and rotates counterclockwise, thereby ensuring that both the inner ring guide rail 11 and the outer ring guide rail 12 can provide support force for the transmission chain 20 and the loading vehicle 30, thereby improving the operational stability.

[0035] In some embodiments, see Figure 2 , Figures 5 to 7 The linear motor 40 is fixed to the outside of the two sets of loading ring rails 10, and each induction aluminum plate extends into the air gap 400 of the primary coil through the annular raceway 100 between adjacent guide support wheels 50. The method of setting the linear motor 40 on the outside of the loading ring rail 10 to drive the movement of the secondary induction aluminum plate 60 can increase the span of the driving force on both sides, thereby improving the running stability of the transmission chain 20 and the loading vehicle 30.

[0036] It should be noted that you should refer to [link / reference]. Figure 2 and Figure 5 The linear motor 40 is fixed to the frame 80 by a motor bracket 70. The motor bracket 70 includes a carrier plate 71 and multiple support ribs 72. Each support rib 72 is spaced apart on the underside of the carrier plate 71 along the extension direction of the straight segment, and each support rib 72 is fixedly connected to the frame 80. The carrier plate 71 provides a mounting surface for easy installation of the linear motor 40. The support ribs 72 on this basis can improve the structural strength of the carrier plate 71, prevent the carrier plate 71 from deforming under stress and affecting the levelness of the linear motor 40, and ensure that the secondary induction aluminum plate 60 can be aligned with the air gap 400 of the primary coil, thereby improving operational stability.

[0037] Specifically, see Figure 1 and Figure 5 In this embodiment, each group of linear motors 40 includes multiple linear motors 40 spaced apart along the extension direction of a straight segment. Each linear motor 40 includes an upper body 41, a lower body 42, and a U-shaped fixing frame 43. The opening of the fixing frame 43 faces between the two sets of loading ring rails 10. The upper body 41 and the lower body 42 are respectively connected to the upper and lower sides of the fixing frame 43, forming a primary coil air gap 400 between them. The fixing frame 43 is fixedly connected to the carrier plate 71. Primary coils are provided on both the upper body 41 and the lower body 42, which helps to improve the electromagnetic driving force and the stress stability of the secondary induction aluminum plate 60. The side-mounted U-shaped fixing frame 43 allows the secondary induction aluminum plate 60 to extend into the primary coil air gap 400, avoiding operational interference.

[0038] It should be understood that, in this embodiment, see Figure 5 and Figure 8 The upper surface of the carrier plate 71 is provided with a positioning groove 711, and the fixing frame 43 is embedded in the positioning groove 711 and fixedly connected to the carrier plate 71. Since the linear motor 40 generates a horizontal linear motion driving force on the secondary induction aluminum plate 60, the linear motor 40 will be subjected to a horizontal reaction force. The positioning groove 711 is provided here to form a horizontal positioning constraint on the fixing frame 43, thereby preventing the linear motor 40 connected to the fixing frame 43 from being displaced under force and affecting the operational stability.

[0039] To ensure that the air gaps 400 of the primary coils of each linear motor 40 are aligned, such as Figure 8 As shown, an adjusting shim 73 is provided between the fixing bracket 43 and the bottom of the positioning groove 711. By replacing or adding / removing the adjusting shim 73, the installation height of the linear motor 40 can be adjusted, thereby aligning the air gap 400 of the primary coil of each linear motor 40 and improving operational stability.

[0040] It should be noted that you should refer to [link / reference]. Figure 6The two sets of transmission chains 20 are connected by a chain shaft 53 between corresponding links, and the two ends of the chain shaft 53 are respectively connected to guide support wheels 50. By setting the chain shaft 53, the structural stability between the two sets of transmission chains 20 can be improved, and the synchronous operation of the two sets of transmission chains 20 can be ensured, thereby improving the operational stability of the loading vehicle 30 and ensuring the operational stability and data accuracy of the linear acceleration loading test.

[0041] Based on the same inventive concept, combined with Figures 1 to 8 It is understood that this application embodiment also provides a straight-track accelerated loading test equipment, including the above-described drive system.

[0042] Compared with the prior art, the straight-track accelerated loading test equipment provided in this embodiment adopts the above-mentioned drive system. Therefore, each link of the chain passing through the straight section and the secondary induction aluminum plate 60 fixed on the loading vehicle 30 can be electromagnetically coupled with the primary coil of the linear motor 40 to obtain driving force, thereby improving the overall driving force of the unidirectional cyclic motion of the transmission chain 20. This not only improves the running speed of the linear accelerated loading test, but also improves the driving stability of the transmission chain 20, thereby improving the running stability of the linear accelerated loading test. The linear motor 40 is fixed to the frame 80 and can be directly connected to the power supply line for power generation. Compared with the slip ring power generation method, it is not only simple in structure, but also has high stability.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. Drive system, characterized in that The drive system comprises two groups of loading ring tracks horizontally spaced and fixed on a rack, two groups of transmission chains respectively connected to the two groups of loading ring tracks, a plurality of loading cars circumferentially spaced and connected to the two groups of transmission chains, and two groups of linear motors.

2. The drive system of claim 1, wherein, The loading ring tracks comprise inner ring guides and outer ring guides, and a ring-shaped rolling track is formed between the inner ring guides and the outer ring guides.

3. The drive system of claim 2, wherein, The guide support wheels comprise coaxially connected inner wheel bodies and outer wheel bodies.

4. The drive system of claim 2, wherein, The linear motors are fixed on the outer sides of the two groups of loading ring tracks, and each of the induction aluminum plates passes through the ring-shaped rolling track between adjacent guide support wheels and extends into the primary coil air gap.

5. The drive system of claim 1, wherein, The linear motors are fixed on the rack through motor supports, the motor supports comprise a carrier plate and a plurality of support ribs, each of the support ribs is distributed on the lower side of the carrier plate along the extension direction of the linear segment, and each of the support ribs is fixedly connected with the rack.

6. The drive system of claim 5, wherein, Each group of linear motors comprises a plurality of linear motors spaced along the extension direction of the linear segment, each of the linear motors comprises an upper machine body, a lower machine body, and a U-shaped fixing frame, the mouth of the fixing frame faces between the two groups of loading ring tracks, the upper machine body and the lower machine body are respectively connected to the upper and lower sides of the fixing frame and form the primary coil air gap therebetween, and the fixing frame is fixedly connected with the carrier plate.

7. The drive system of claim 6, wherein, The upper surface of the carrier plate is provided with a positioning groove, the fixing frame is embedded in the positioning groove and fixedly connected with the carrier plate.

8. The drive system of claim 7, wherein, An adjusting gasket is arranged between the fixing frame and the bottom of the positioning groove.

9. The drive system of claim 2, wherein, Chain shafts are connected between the corresponding chain links of the two groups of transmission chains, and the two ends of each chain shaft are respectively connected with the guide support wheels.

10. A straightaway acceleration loading test apparatus characterized by, The drive system comprises two groups of loading ring tracks horizontally spaced and fixed on a rack, two groups of transmission chains respectively connected to the two groups of loading ring tracks, a plurality of loading cars circumferentially spaced and connected to the two groups of transmission chains, and two groups of linear motors. The loading ring tracks comprise inner ring guides and outer ring guides, and a ring-shaped rolling track is formed between the inner ring guides and the outer ring guides. The guide support wheels comprise coaxially connected inner wheel bodies and outer wheel bodies. The linear motors are fixed on the outer sides of the two groups of loading ring tracks, and each of the induction aluminum plates passes through the ring-shaped rolling track between adjacent guide support wheels and extends into the primary coil air gap. The linear motors are fixed on the rack through motor supports, the motor supports comprise a carrier plate and a plurality of support ribs, each of the support ribs is distributed on the lower side of the carrier plate along the extension direction of the linear segment, and each of the support ribs is fixedly connected with the rack. Each group of linear motors comprises a plurality of linear motors spaced along the extension direction of the linear segment, each of the linear motors comprises an upper machine body, a lower machine body, and a U-shaped fixing frame, the mouth of the fixing frame faces between the two groups of loading ring tracks, the upper machine body and the lower machine body are respectively connected to the upper and lower sides of the fixing frame and form the primary coil air gap therebetween, and the fixing frame is fixedly connected with the carrier plate. The upper surface of the carrier plate is provided with a positioning groove, the fixing frame is embedded in the positioning groove and fixedly connected with the carrier plate. An adjusting gasket is arranged between the fixing frame and the bottom of the positioning groove. Chain shafts are connected between the corresponding chain links of the two groups of transmission chains, and the two ends of each chain shaft are respectively connected with the guide support wheels. The drive system comprises two groups of loading ring tracks horizontally spaced and fixed on a rack, two groups of transmission chains respectively connected to the two groups of loading ring tracks, a plurality of loading cars circumferentially spaced and connected to the two groups of transmission chains, and two groups of linear motors.

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