Shield tunneling machine main drive wear-resistant belt assembling equipment

Abstract

The utility model provides shield tunneling machine main drive wear-resistant belt assembling equipment which comprises a supporting body, a supporting mechanism, a preheating device and a propelling device, the supporting mechanism is installed on the supporting body and comprises a plurality of movable parts distributed in the circumferential direction, and the movable parts are used for moving to abut against the inner wall of a main drive supporting ring; the preheating device is installed on the supporting body and used for heating a wear-resistant steel belt located above the main drive supporting ring. The propelling device is installed on the supporting body and used for applying downward thrust to the abrasion-resistant steel belt located above the main drive supporting ring, and the technical problem that the assembly difficulty of the main drive abrasion-resistant belt of the shield tunneling machine is large is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of shield machines, in particular to a main drive wear-resistant belt assembly device for shield machines. Background Art

[0002] The main drive of the shield machine is the core and key part of the shield machine. The quality of the main drive affects the quality and construction effect of the entire shield. The main drive sealing system consists of three parts: lip seal, sealing runway and wear-resistant belt. During the construction process, it directly contacts the slag as a protective layer and prevents mud from entering the main drive. The wear-resistant belt is attached to the support ring and combined with the support ring with an interference fit, while preventing the lip seal from causing wear to the support ring. The assembly of the wear-resistant belt is the top priority of assembling the shield machine.

[0003] The wear-resistant belt is a thin-walled annular component that is installed on the support ring by heat installation. The traditional heating method is to use propane or acetylene as a combustion-supporting gas to heat the wear-resistant belt, wait until the wear-resistant belt expands due to heat, and then transfer it to the installation site. The wear-resistant belt quickly cools down and fits with the support ring. This installation method has many disadvantages. For small-diameter shields, it is impossible to accurately control the temperature, the wear-resistant belt is heated unevenly, and the expansion margin is difficult to control, resulting in the inability to accurately calculate the length of the steel belt for making the wear-resistant belt. If it is too large, it cannot fit tightly, and if it is too small, it will cause difficulty in assembly. For large-diameter shields, multiple people are required to work together, and the consistency of movement is difficult to control. During manual operation, the working environment is heated at high temperature and the working conditions are poor. When installing in a tunnel, because it is usually a closed space, there are fire operations, high temperature and thick smoke, there are safety hazards, and the operating space for personnel is small, which requires high skills of workers. Utility Model Content

[0004] The utility model aims to provide a shield machine main drive wear-resistant belt assembly device to solve the technical problem that the shield machine main drive wear-resistant belt assembly is relatively difficult.

[0005] The above-mentioned purpose of the utility model can be achieved by adopting the following technical solutions:

[0006] The utility model provides a shield machine main drive wear-resistant belt assembly device, comprising: a support body, a support mechanism, a preheating device and a propulsion device, wherein the support mechanism is installed on the support body, and the support mechanism comprises a plurality of circumferentially distributed movable parts, and the movable parts are used to move to abut against the inner wall of the main drive support ring;

[0007] The preheating device is installed on the support body, and the preheating device is used to heat the wear-resistant steel belt located above the main drive support ring;

[0008] The propulsion device is installed on the support body, and is used to apply downward thrust to the wear-resistant steel belt located above the main drive support ring.

[0009] In a preferred embodiment, the preheating device comprises a preheating nozzle, the opening of the preheating nozzle faces outward, and the preheating nozzle is used to be arranged in the wear-resistant steel belt to heat the inner wall of the wear-resistant steel belt.

[0010] In a preferred embodiment, the preheating nozzle is mounted on a rotating arm, the rotating arm is mounted on the supporting body, and the rotating arm can rotate around the supporting body; and / or a plurality of the preheating nozzles are distributed circumferentially around the supporting body.

[0011] In a preferred embodiment, a plurality of the preheating nozzles are distributed along the longitudinal direction of the support body.

[0012] In a preferred embodiment, the shield machine main drive wear-resistant belt assembly equipment includes a temperature measuring probe, and the temperature measuring probe is arranged below the preheating device.

[0013] In a preferred embodiment, the propulsion device includes a vertical telescopic rod and a clamping mechanism, the vertical telescopic rod is installed on the support body, the clamping mechanism is installed on the vertical telescopic rod, and the clamping mechanism is used to clamp the upper end of the wear-resistant steel belt.

[0014] In a preferred embodiment, the clamping mechanism includes a clamp and a first telescopic rod, the first telescopic rod is mounted on the vertical telescopic rod, the clamp is mounted on the first telescopic rod, and the first telescopic rod is used to drive the clamp to move inside and outside relative to the support body.

[0015] In a preferred embodiment, the clamp is provided with a clamping groove, the opening of the clamping groove faces downward, and the wear-resistant steel belt can extend into the clamping groove.

[0016] In a preferred embodiment, the movable member includes a second telescopic rod and a support shoe, the second telescopic rod is mounted on the support body, the support shoe is mounted on the second telescopic rod, and the second telescopic rod is used to drive the support shoe to move inside and outside relative to the support body.

[0017] In a preferred embodiment, the support body includes a support rod, which can be at least partially arranged in the main drive support ring and arranged along the axial extension of the main drive support ring; the support mechanism is detachably mounted on the lower end of the support rod, the propulsion device is detachably mounted on the upper end of the support rod, and the preheating device is arranged between the support mechanism and the propulsion device.

[0018] The characteristics and advantages of this utility model are:

[0019] When in use, the support body is placed in the main drive support ring, and a plurality of circumferentially distributed movable parts are respectively moved to abut against the inner wall of the main drive support ring, so that the support mechanism is fixed to the main drive support ring. In this way, the support body is fixed to the main drive support ring through the support mechanism, and the support body provides support for the preheating device and the propulsion device. The wear-resistant steel belt to be installed is pre-set above the main drive support ring; the preheating device heats the wear-resistant steel belt, and after the wear-resistant steel belt expands to a suitable degree due to heat, the propulsion device immediately applies a downward thrust to the wear-resistant steel belt, so that the wear-resistant steel belt is smoothly sleeved on the outside of the main drive support ring, and the wear-resistant steel belt forms an interference fit with the main drive support ring after cooling down. The assembly equipment provided by the utility model improves the smoothness of the assembly operation of the main drive wear-resistant belt of the shield machine, reduces the difficulty of assembly, and is conducive to improving assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 The overall schematic diagram of the shield machine main drive wear-resistant belt assembly equipment provided by the utility model;

[0022] Figure 2 for Figure 1 The schematic diagram of the cooperation between the preheating device and the wear-resistant steel belt in the shield machine main drive wear-resistant belt assembly equipment shown;

[0023] Figure 3 for Figure 1 A partial schematic diagram of the propulsion device in the main drive wear-resistant belt assembly equipment of the shield machine is shown.

[0024] Description of Figure Numbers:

[0025] 11. Wear-resistant steel belt; 12. Main drive support ring;

[0026] 20. Support body; 21. Support rod;

[0027] 30. Support mechanism; 31. Movable member; 32. Second telescopic rod; 33. Support shoe;

[0028] 40. Preheating device; 41. Preheating nozzle; 42. Rotating arm; 43. Rotating cylinder; 44. Temperature measuring probe;

[0029] 50. Propulsion device; 51. Connecting seat;

[0030] 52. Vertical telescopic rod;

[0031] 53. Clamping mechanism; 531. Clamp; 5311. Clamping groove; 532. First telescopic rod. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] The utility model provides a shield machine main drive wear-resistant belt assembly device, such as Figure 1-Figure 3 As shown, the assembly equipment includes: a support body 20, a support mechanism 30, a preheating device 40 and a propulsion device 50, the support mechanism 30 is installed on the support body 20, the support mechanism 30 includes a plurality of circumferentially distributed movable parts 31, the movable parts 31 are used to move to abut against the inner wall of the main drive support ring 12; the preheating device 40 is installed on the support body 20, the preheating device 40 is used to heat the wear-resistant steel belt 11 located above the main drive support ring 12; the propulsion device 50 is installed on the support body 20, the propulsion device 50 is used to apply a downward thrust to the wear-resistant steel belt 11 located above the main drive support ring 12.

[0034] When in use, the support body 20 is placed in the main drive support ring 12, and a plurality of circumferentially distributed movable parts 31 are respectively moved to abut against the inner wall of the main drive support ring 12, so that the support mechanism 30 is fixed to the main drive support ring 12, so that the support body 20 is fixed to the main drive support ring 12 through the support mechanism 30, and the support body 20 provides support for the preheating device 40 and the propulsion device 50. The wear-resistant steel belt 11 to be installed is pre-set above the main drive support ring 12; the preheating device 40 heats the wear-resistant steel belt 11, and after the wear-resistant steel belt 11 is heated and expanded to a suitable degree, the propulsion device 50 immediately applies a downward thrust to the wear-resistant steel belt 11, so that the wear-resistant steel belt 11 is smoothly sleeved outside the main drive support ring 12, and the wear-resistant steel belt 11 forms an interference fit with the main drive support ring 12 after cooling. Through the assembly equipment provided by the utility model, the smoothness of the assembly operation of the main drive wear-resistant belt of the shield machine is improved, the assembly difficulty is reduced, and it is conducive to improving the assembly efficiency.

[0035] In one embodiment, the preheating device 40 includes a preheating nozzle 41, the opening of the preheating nozzle 41 faces outward, and the preheating nozzle 41 is used to be arranged in the wear-resistant steel belt 11 to heat the inner wall of the wear-resistant steel belt 11. The gas is transported to the preheating nozzle 41 along the pipeline, and the flame at the preheating nozzle 41 is sprayed outward to heat the inner wall of the wear-resistant steel belt 11, which is conducive to the wear-resistant steel belt 11 expanding outward due to heat, so that the wear-resistant steel belt 11 can be sleeved outside the main drive support ring 12 under the action of thrust.

[0036] In one embodiment, if Figure 1 and Figure 2 As shown, the preheating nozzle 41 is mounted on a rotating arm 42, and the rotating arm 42 is mounted on the support body 20, and the rotating arm 42 can rotate around the support body 20. The preheating nozzle 41 heats while rotating, which is conducive to uniformly heating the wear-resistant steel belt 11 in the circumferential direction, improving the uniformity of heating the wear-resistant steel belt 11, and reducing the problem of poor accurate calculation of the expansion amount and poor control of interference fit of the wear-resistant steel belt 11 due to uneven heating during hot installation. Specifically, the rotating arm 42 can be mounted on a rotating cylinder 43, and the rotating cylinder 43 can be rotatably sleeved outside the support body 20, and the rotating cylinder 43 can rotate around the support body 20 under the drive of the driving mechanism. For example: the rotating cylinder 43 and the support body 20 itself serve as a driving mechanism, and the two form a motor, the support body 20 serves as a stator, and the rotating cylinder 43 serves as a rotor. The driving mechanism can also be other structures, and the driving mechanism is connected to the rotating cylinder 43 and drives the rotating cylinder 43 to rotate.

[0037] In another embodiment, a plurality of preheating nozzles 41 are distributed circumferentially around the support body 20 so that the wear-resistant steel belt 11 is heated uniformly in the circumferential direction, thereby improving the uniformity of heating the wear-resistant steel belt 11 and reducing the problem of the wear-resistant steel belt 11 being difficult to accurately calculate the expansion amount and control the interference fit due to uneven heating during hot loading.

[0038] Preferably, the preheating nozzle 41 is mounted on a rotating arm 42, which is mounted on the support body 20, and the rotating arm 42 can rotate around the support body 20; moreover, a plurality of rotating arms 42 are distributed circumferentially around the support body 20, and each rotating arm 42 is respectively mounted with a preheating nozzle 41, which is conducive to uniform heating of the wear-resistant steel belt 11 in the circumferential direction, and improves the uniformity of heating the wear-resistant steel belt 11. The rotating arm 42 can adopt a retractable structure, and the rotating arm 42 drives the preheating nozzle 41 to move inside and outside to adjust the position of the preheating nozzle 41, so as to heat the wear-resistant steel belt 11.

[0039] Furthermore, multiple preheating nozzles 41 are distributed along the longitudinal direction of the support body 20. When the support body 20 is fixed to the main drive support ring 12, the longitudinal direction of the support body 20 is parallel or approximately parallel to the axial direction of the wear-resistant steel belt 11, which is beneficial to ensure that the wear-resistant steel belt 11 is evenly heated in the axial direction, improve the uniformity of heating of the wear-resistant steel belt 11, ensure uniform expansion of all heated parts of the wear-resistant steel belt 11, and improve installation accuracy.

[0040] In one embodiment, the shield machine main drive wear-resistant belt assembly equipment includes a temperature measuring probe 44, which is arranged below the preheating device 40. During hot installation, the lower end of the wear-resistant steel belt 11 is first installed outside the main drive support ring 12, and the temperature measuring probe 44 is close to the lower end of the wear-resistant steel belt 11, which is convenient for monitoring the temperature of the part of the wear-resistant steel belt 11 to be installed on the main drive support ring 12, so as to accurately control the temperature and achieve precise control of the expansion amount, thereby solving the problem that the expansion margin of the wear-resistant steel belt 11 set is difficult to grasp and the interference fit effect is difficult to accurately control.

[0041] The shield machine main drive wear-resistant belt assembly equipment also includes a temperature control device, and the temperature probe 44 and the temperature control device form a monitoring device. When the temperature probe 44 detects that the temperature reaches the set value, the temperature control device controls to cut off the supply of gas to the preheating nozzle 41. The monitoring device monitors the temperature in real time and cooperates with the control of the propulsion device 50 to apply force, thereby solving the problem of interference fit difficulty caused by the wear-resistant steel belt 11 being difficult to control due to uneven heating and expansion.

[0042] In one embodiment, the propulsion device 50 includes a vertical telescopic rod 52 and a clamping mechanism 53, wherein the vertical telescopic rod 52 is mounted on the support body 20, and the clamping mechanism 53 is mounted on the vertical telescopic rod 52, and the clamping mechanism 53 is used to clamp the upper end of the wear-resistant steel belt 11. The vertical telescopic rod 52 drives the clamping mechanism 53 to move downward to achieve a downward thrust on the wear-resistant steel belt 11. In addition, the clamping mechanism 53 can play a positioning role for the wear-resistant steel belt 11 that has not yet been mounted on the main drive support ring 12, so as to facilitate the preheating device 40 to heat the wear-resistant steel belt 11, and after the wear-resistant steel belt 11 is heated and expanded to a suitable degree, the propulsion device 50 timely presses down the wear-resistant steel belt 11, so as to reduce the temperature and expansion of the wear-resistant steel belt 11 due to heat loss, which is conducive to ensuring the smoothness of the hot installation of the wear-resistant steel belt 11 and the effect of interference fit.

[0043] Furthermore, the clamping mechanism 53 includes a clamp 531 and a first telescopic rod 532, the first telescopic rod 532 is mounted on the vertical telescopic rod 52, the clamp 531 is mounted on the first telescopic rod 532, and the first telescopic rod 532 is used to drive the clamp 531 to move inward and outward relative to the support body 20, so that the clamping mechanism 53 can adapt to wear-resistant steel belts 11 of different diameters, thereby improving the scope of application of the shield machine main drive wear-resistant belt assembly device provided by the utility model. Multiple clamping mechanisms 53 can be mounted on the upper end of the vertical telescopic rod 52 through the connecting seat 51.

[0044] Furthermore, if Figure 1 and Figure 3As shown, the clamp 531 is provided with a clamping groove 5311, the opening of the clamping groove 5311 faces downward, and the wear-resistant steel belt 11 can extend into the clamping groove 5311. After the wear-resistant steel belt 11 extends into the clamping groove 5311, the plurality of clamps 531 distributed circumferentially can together play a positioning role for the wear-resistant steel belt 11. Preferably, the clamp 531 has a movable part, and the movable part is movable to change the width of the clamping groove 5311 so as to clamp the wear-resistant steel belt 11.

[0045] Figure 1 The assembly equipment shown is fixed to the main drive support ring 12 through a supporting mechanism, the preheating device 40 rotates and heats the wear-resistant steel belt 11 placed above the main drive support ring 12, and the monitoring device simultaneously monitors the temperature value. When the temperature of the wear-resistant steel belt 11 reaches the preset temperature, the vertical telescopic rod 52 will cooperate with the clamp 531 to push the wear-resistant steel belt 11 to the outside of the main drive support ring 12 until it fits tightly. Compared with the method of manually heating the wear-resistant steel belt 11, the main drive wear-resistant belt assembly equipment of the shield machine provided by the utility model solves the problem of uneven heating of the wear-resistant steel belt 11 and poor control of the expansion margin through the preheating device 40 and the monitoring device. The wear-resistant steel belt 11 is pushed to fit the main drive support ring 12 by the propulsion device 50, which can not only solve the problem of the wear-resistant steel belt 11 tilting due to uneven manual force and the wear-resistant steel belt 11 and the main drive support ring 12 cannot accurately match the problem, but also prevent workers from close contact with open flames in the tunnel, reducing safety hazards.

[0046] In one embodiment, the movable part 31 includes a second telescopic rod 32 and a support shoe 33. The second telescopic rod 32 is installed on the support body 20, and the support shoe 33 is installed on the second telescopic rod 32. The second telescopic rod 32 is used to drive the support shoe 33 to move inward and outward relative to the support body 20, so that the support shoe 33 is firmly abutted against the inner wall of the main drive support ring 12; and the movable part 31 can be adapted to the main drive support rings 12 with different inner diameters.

[0047] Furthermore, if Figure 1 and Figure 2As shown, the support body 20 includes a support rod 21, which can be at least partially arranged in the main drive support ring 12 and arranged along the axial extension of the main drive support ring 12; the support mechanism 30 is detachably mounted on the lower end of the support rod 21, the propulsion device 50 is detachably mounted on the upper end of the support rod 21, and the preheating device 40 is arranged between the support mechanism 30 and the propulsion device 50. Through the support rod 21, the support mechanism 30, the preheating device 40 and the propulsion device 50 are connected together, so that after the preheating device 40 heats the wear-resistant steel belt 11, the propulsion device 50 presses the wear-resistant steel belt 11 to drive the wear-resistant steel belt 11 to be sleeved outside the main drive support ring 12, ensuring smooth connection between the heating and pressurizing hot-loading steps. Moreover, during the hot loading process, the support rod 21 is fixed to the main drive support ring 12 through the support mechanism 30, and the preheating device 40 and the propulsion device 50 are supported by the support rod 21, so that the structure of the assembly equipment is relatively simple, which is convenient for adapting to the main drive support ring 12 and is beneficial to improving the assembly efficiency of the wear-resistant steel belt 11.

[0048] Preferably, the support mechanism 30 , the preheating device 40 , the propulsion device 50 and the monitoring device can be detachably mounted on the support rod 21 , and can be assembled again when in use, so as to facilitate the arrangement of the assembly equipment into the main drive support ring 12 .

[0049] The vertical telescopic rod 52, the first telescopic rod 532 and the second telescopic rod 32 can be driven by hydraulic cylinders, air cylinders or electric cylinders to achieve telescopic movement. When the assembly equipment is arranged on the main drive support ring 12, the moving direction of the vertical telescopic rod 52 is preferably the axial direction of the main drive support ring 12, and the moving direction of the first telescopic rod 532 and the second telescopic rod 32 is preferably the radial direction of the main drive support ring 12. Specifically, the first telescopic rod 532 and the second telescopic rod 32 can be freely extended or reduced, respectively controlled by the remote control device; the vertical telescopic rod 52 is also controlled by the remote control device. The preheating device 40 may also not use the preheating nozzle 41. For example, the preheating device 40 uses an electric heating device, and the combustible gas is replaced by an electric couple to improve safety.

[0050] The shield machine main drive wear-resistant belt assembly equipment provided by the utility model is suitable for the shield machine main drive wear-resistant belt assembly. Before assembly, the clamping mechanism 53 clamps the wear-resistant steel belt 11, and the wear-resistant steel belt 11 is heated by the preheating nozzle 41. The preheating nozzle 41 rotates around the support rod 21 while heating, and the temperature measuring probe 44 measures the temperature synchronously. When the temperature of the wear-resistant steel belt 11 reaches the preset temperature, the preheating nozzle 41 stops heating, and the vertical telescopic rod 52 shrinks until the wear-resistant steel belt 11 is tightly fitted with the main drive support ring 12, which can ensure the assembly accuracy of the wear-resistant steel belt 11, is conducive to solving the safety problem of workers' close contact with open flames when performing the operation of installing the wear-resistant steel belt 11, solves the problem of workers' difficulty in operation and safety hazards caused by the narrow working space, and saves labor costs.

[0051] The shield machine main drive wear-resistant belt assembly device provided by the utility model can also be used for disassembling the wear-resistant steel belt 11. After the wear-resistant steel belt 11 is heated and expanded, the propulsion device 50 clamps the wear-resistant steel belt 11 and applies force upward to disassemble the wear-resistant steel belt 11 from the main drive support ring 12. During disassembly, the wear-resistant steel belt 11 can be heated by the preheating device 40 or by an external device.

[0052] The above are only several embodiments of the present invention. Those skilled in the art can make various changes or modifications to the embodiments of the present invention based on the contents disclosed in the application documents without departing from the spirit and scope of the present invention.

Claims

1. A shield machine main drive wear-resistant belt assembly device, characterized in that: include: A support body, a support mechanism, a preheating device and a propulsion device, wherein the support mechanism is mounted on the support body, and the support mechanism comprises a plurality of circumferentially distributed movable parts, wherein the movable parts are used to move to abut against the inner wall of the main drive support ring; The preheating device is installed on the support body, and the preheating device is used to heat the wear-resistant steel belt located above the main drive support ring; The propulsion device is installed on the support body, and is used to apply downward thrust to the wear-resistant steel belt located above the main drive support ring.

2. The shield machine main drive wear-resistant belt assembly equipment according to claim 1 is characterized in that: The preheating device comprises a preheating nozzle, the opening of the preheating nozzle faces outward, and the preheating nozzle is used to be arranged in the wear-resistant steel belt to heat the inner wall of the wear-resistant steel belt.

3. The shield machine main drive wear-resistant belt assembly equipment according to claim 2 is characterized in that: The preheating nozzle is mounted on a rotating arm, the rotating arm is mounted on the supporting body, and the rotating arm can rotate around the supporting body; And / or, a plurality of the preheating nozzles are distributed circumferentially around the support body.

4. The shield machine main drive wear-resistant belt assembly equipment according to claim 3 is characterized in that: The plurality of preheating nozzles are distributed along the longitudinal direction of the support body.

5. The shield machine main drive wear-resistant belt assembly equipment according to claim 1, characterized in that: The shield machine main drive wear-resistant belt assembly equipment comprises a temperature measuring probe, and the temperature measuring probe is arranged below the preheating device.

6. The shield machine main drive wear-resistant belt assembly equipment according to claim 1, characterized in that: The propulsion device comprises a vertical telescopic rod and a clamping mechanism, wherein the vertical telescopic rod is mounted on the support body, and the clamping mechanism is mounted on the vertical telescopic rod, and the clamping mechanism is used to clamp the upper end of the wear-resistant steel belt.

7. The shield machine main drive wear-resistant belt assembly equipment according to claim 6, characterized in that: The clamping mechanism includes a clamp and a first telescopic rod, the first telescopic rod is installed on the vertical telescopic rod, the clamp is installed on the first telescopic rod, and the first telescopic rod is used to drive the clamp to move inside and outside relative to the support body.

8. The shield machine main drive wear-resistant belt assembly equipment according to claim 7, characterized in that: The clamp is provided with a clamping groove, the opening of which faces downward, and the wear-resistant steel belt can extend into the clamping groove.

9. The shield machine main drive wear-resistant belt assembly equipment according to claim 1, characterized in that: The movable member comprises a second telescopic rod and a support shoe, wherein the second telescopic rod is mounted on the support body, and the support shoe is mounted on the second telescopic rod, and the second telescopic rod is used for driving the support shoe to move inside and outside relative to the support body.

10. The shield machine main drive wear-resistant belt assembly equipment according to any one of claims 1 to 9, characterized in that: The support body comprises a support rod, and the support rod can be at least partially disposed in the main drive support ring and arranged along the axial extension of the main drive support ring; The supporting mechanism is detachably mounted on the lower end of the supporting rod, the propulsion device is detachably mounted on the upper end of the supporting rod, and the preheating device is arranged between the supporting mechanism and the propulsion device.

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