Automatic loading and unloading machine for bolts of spent fuel transportation container

Abstract

The embodiment of the invention discloses an automatic loading and unloading machine for a spent fuel transport container bolt, comprising: an automatic lifting mechanism, the automatic lifting mechanism comprises a lifting body, a fixing body and a first driving device, the first driving device is used for driving the lifting body to lift, and the fixing body can be connected to a cover body of a to-be-disassembled bolt; the automatic rotating mechanism comprises a base, a rotating body, a supporting arm and a second driving device, the supporting arm is connected to the rotating body, the rotating body is rotatably connected with the base, and the base is connected to the lifting body; and the automatic screwing mechanism comprises a screwing shaft supporting plate, a third driving device and a screwing sleeve, the screwing sleeve is matched with the head of the bolt to be disassembled and assembled, and the screwing shaft supporting plate is connected to the supporting arm. According to the automatic bolt loading and unloading machine, the bolts of the spent fuel transportation container can be automatically screwed or unscrewed, so that workers can be liberated from the operation of disassembling and assembling the bolts, the labor cost is reduced, the operation risk is reduced, and the operation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of spent fuel transport containers, and more specifically to an automatic bolt loading and unloading machine for spent fuel transport containers. Background Art

[0002] Please refer to the attached Figure 1 -Attached Figure 3 The spent fuel transport container includes a barrel 100, an inner cover 200, inner cover bolts 201, an outer cover 300, and outer cover bolts 301. An upper forging 400 is provided on the upper part of the barrel 100. The inner cover 200 is connected to the upper forging 400 through the inner cover bolts 201, and the outer cover 300 is connected to the upper forging 400 through the outer cover bolts 301. At present, during the loading and unloading process of the spent fuel transport container, the tightening and disassembly of the inner cover bolts 201 are operated by hydraulic torque wrenches. The 42 inner cover bolts 201 are tightened to 3443Nm, and at least 5 people are required to operate simultaneously each time: 3 people as bolt loading and unloading operators operate the hydraulic torque wrench in the cleaning well; 1 person as a supervisor to supervise and check the operation sequence; 1 person as a power unit control personnel, operating the hydraulic pump station. The 3 bolt loading and unloading operators perform tightening and disassembly operations in a certain order around the container in the cleaning well.

[0003] There are many pipelines at the operation site. The three bolt loading and unloading operators need to constantly adjust their own positions and the positions of the pipelines during the bolt loading and unloading process. In addition, the noise at the site is relatively high. The three bolt loading and unloading operators and the power unit control personnel rely on hand gestures to coordinate operations, which poses certain safety hazards. In addition, the on-site working environment temperature is high (close to 30°C). In addition to wearing basic work clothes (7-piece suits), in order to prevent contamination and internal irradiation, the personnel also need to wear paper clothes with air masks or full-face masks. The on-site manual working conditions are poor and not suitable for long-term operations. The physical fitness requirements for operators are very high. According to the high-fuel consumption loading operation conditions, the dose rate on the upper surface of the container is higher, and the operator's operation time is more than one hour. The operator's labor intensity is high and the exposure dose rate is high. One operation accounts for more than half of the collective dose of the entire loading work, which is risky, time-consuming, and inefficient.

[0004] Therefore, how to reduce labor costs, improve work efficiency, and reduce work risks is a key issue that technical personnel in this field need to solve urgently. Summary of the invention

[0005] In view of this, the purpose of the present invention is to reduce labor costs, improve work efficiency, and reduce work risks.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An automatic loading and unloading machine for bolts of a spent fuel transport container, comprising:

[0008] An automatic lifting mechanism, the automatic lifting mechanism comprising a lifting body, a fixed body, and a first driving device, the lifting body is arranged above the fixed body, the first driving device is arranged on the fixed body, the first driving device is used to drive the lifting body to rise and fall, and the fixed body can be connected to a cover body of a bolt to be disassembled;

[0009] An automatic slewing mechanism, the automatic slewing mechanism comprises a base, a slewing body, a support arm, and a second driving device, the support arm is connected to the slewing body, the slewing body is rotatably connected to the base, the second driving device is used to drive the slewing body to rotate, and the base is connected to the lifting body;

[0010] An automatic screwing mechanism, the automatic screwing mechanism comprising a screwing shaft support plate, a third driving device, and a screwing sleeve, the screwing sleeve is adapted to the head of the bolt to be disassembled, the third driving device is used to drive the screwing sleeve to rotate, the screwing shaft support plate is used to support the third driving device and the screwing sleeve, and the screwing shaft support plate is connected to the support arm;

[0011] Preferably, there are three support arms, which are evenly arranged around the rotating body, and each support arm is connected to one of the automatic screwing mechanisms.

[0012] Preferably, the automatic screwing mechanism further includes a reaction force compensation sleeve, and the number of the reaction force compensation sleeves is two, the two reaction force compensation sleeves are distributed on both sides of the screwing sleeve, and the two reaction force compensation sleeves are bolted to the screwing shaft support plate.

[0013] Preferably, the automatic screwing mechanism also includes a planetary reducer, a final reducer, a bracket and an output spline shaft, the input shaft of the planetary reducer is connected to the output end of the third drive device, the output shaft of the planetary reducer is connected to the input shaft of the final reducer, the output shaft of the final reducer is connected to the output spline shaft, the screwing sleeve is connected to the spline shaft, the casing of the final reducer is connected to the bracket, and the bracket is connected to the screwing shaft support plate.

[0014] Preferably, a first flange is provided at one end of the lifting body away from the fixed body, a second flange is provided on the base, and the first flange and the second flange are cooperatively connected.

[0015] Preferably, the first driving device is a driving motor, a motor shaft of the driving motor is connected to a worm gear reducer, the worm gear reducer is connected to a screw mechanism, and the screw mechanism is connected to the lifting body.

[0016] Preferably, the automatic lifting mechanism also includes a base, which includes a base body and a connecting arm, one end of the connecting arm is connected to the base body, and the other end is provided with a base connecting piece, and the base connecting piece is provided with a through hole, which is adapted to the threaded hole on the cover body of the bolt to be disassembled.

[0017] Preferably, the fixed body comprises a first fixed body and a second fixed body, the second fixed body is arranged above the first fixed body, the lifting body penetrates the second fixed body along the lifting direction, and the outer diameter of the first fixed body is larger than the outer diameter of the second fixed body.

[0018] Preferably, the lifting body is provided with a linear guide rail extending along the lifting direction of the lifting body, and the second fixed body is provided with a linear bearing inside, and the linear guide rail is slidably fitted in the linear bearing.

[0019] Preferably, the second fixed body is a cuboid, the linear guide rails are multiple and arranged around the lifting body, and each of the linear guide rails is matched in one of the linear bearings.

[0020] The automatic bolt loading and unloading machine in the present invention can automatically complete the tightening or loosening of the bolts, so it can free the human from the operation of disassembling and assembling the bolts, thereby reducing the labor cost, reducing the operation risk, and improving the operation efficiency. Secondly, as long as the rotation angle is set in advance, the automatic loading and unloading machine can tighten or loosen all the bolts on the inner cover in the designed order. In the prior art, it is very easy to have the problems of wrong tightening position, missed tightening, and repeated tightening when manually tightening the bolts. In addition, the third driving device in the automatic screwing mechanism in the present invention can be completely set as a servo motor, that is, the servo motor is used to provide power for the screwing sleeve, so as to tighten or loosen the bolts. The automatic screwing mechanism in the present invention automatically screws the bolts, has high screwing accuracy, and has fewer and shorter connecting pipelines. In the prior art, a hydraulic wrench is used to screw the bolts. The working pressure of the hydraulic wrench is large, the danger is large, and the pipeline between the hydraulic wrench and the hydraulic station makes the site more chaotic. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0022] Figure 1 An exploded view of a spent fuel transport container provided in a specific embodiment of the prior art;

[0023] Figure 2A schematic diagram of the overall structure of a spent fuel transport container provided by a specific embodiment of the prior art;

[0024] Figure 3 A schematic diagram of the assembly of an outer cover, an inner cover and a barrel body provided in a specific embodiment of the prior art;

[0025] Figure 4 A schematic diagram of the overall structure of an automatic bolt loading and unloading machine for a spent fuel transport container provided in a specific embodiment of the present invention;

[0026] Figure 5 A structural schematic diagram of a lifting mechanism provided in a specific embodiment of the present invention;

[0027] Figure 6 A schematic diagram of the structure of a rotary mechanism provided in a specific embodiment of the present invention;

[0028] Figure 7 A plan view of a screwing mechanism provided in accordance with a specific embodiment of the present invention.

[0029] Among them, 100-barrel body, 200-inner cover, 201-inner cover bolts, 300-outer cover, 301-outer cover bolts, 400-upper forgings;

[0030] 1-lifting mechanism, 2-rotating mechanism, 3-automatic screwing mechanism, 4-inner cover, 41-inner cover bolt, 11-lifting body, 12-linear guide, 13-first fixed body, 14-second fixed body, 15-base, 16-first driving device, 17-first flange, 18-base connector, 21-rotating body, 22-second driving device, 23-support arm, 24-gear plate, 25-second flange, 30-screwing shaft support plate, 31-housing, 32-screwing sleeve, 33-reaction force offset sleeve, 34-third driving device, 35-planetary reducer, 36-torque sensor, 37-final reducer, 38-bracket, 39-output spline shaft. DETAILED DESCRIPTION

[0031] The core of the present invention is to provide an automatic loading and unloading machine for bolts of a spent fuel transport container, which can reduce labor costs, improve operating efficiency and reduce operating risks.

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

[0033] Please refer to the attached Figure 4 -Attached Figure 7 The present invention discloses an automatic bolt loading and unloading machine for a spent fuel transport container. The automatic bolt loading and unloading machine comprises: an automatic lifting mechanism 1, an automatic rotating mechanism 2 and an automatic screwing mechanism 3.

[0034] Among them, the automatic lifting mechanism 1 includes a lifting body 11, a fixed body and a first driving device 16. The lifting body 11 is arranged above the fixed body, and the first driving device 16 is arranged on the fixed body. The first driving device 16 is used to drive the lifting body 11 to rise and fall. The fixed body can be connected to the cover body of the bolt to be disassembled (such as the inner cover 4 of the spent fuel transport container). The automatic rotating mechanism 2 includes: a base, a rotating body 21, a support arm 23 and a second driving device 22. The support arm 23 is connected to the rotating body 21. The second driving device 22 is used to drive the rotating body 21 to rotate. The rotating body 21 is rotatably arranged on the base. The automatic screwing mechanism 3 includes: a screwing shaft support plate 30, a third driving device 34 and a screwing sleeve 32. The screwing sleeve 32 is adapted to the head of the bolt to be disassembled (the inner cover bolt 41). The third driving device 34 is used to drive the screwing sleeve 32 to rotate, the screwing shaft support plate 30 is used to support the third driving device 34 and the screwing sleeve 32, and the end of the support arm 23 is connected to the screwing shaft support plate 30. In addition, a shell 31 can be provided, the shell 31 is connected to the screwing shaft support plate 30, and the shell 31 encloses the third driving device and the screwing shaft support plate 30.

[0035] When using the automatic bolt loading and unloading machine for the spent fuel transport container, first, the bolt automatic loading and unloading machine hoist is installed on the inner cover 4 of the spent fuel transport container, and then the fixed body is connected to the inner cover 4 of the container. Then, the lifting body 11 is driven to descend by the first driving device 16, so that the screwing sleeve 32 is sleeved on the head of the inner cover bolt 41. Then, the screwing sleeve 32 is driven to rotate by the third driving device 34 to tighten or loosen the inner cover bolt 41. After tightening or loosening the inner cover bolt 41, the lifting body 11 is driven to rise by the first driving device 16, so that the screwing sleeve 32 is separated from the inner cover bolt 41. Then, the second driving device 22 drives the rotating body 21 to rotate by a preset angle, so that the automatic screwing mechanism 3 will rotate with the rotating body 21 to the top of the next inner cover bolt 41, and then the next inner cover bolt 41 will be automatically screwed.

[0036] The automatic bolt loading and unloading machine in the present invention can automatically complete the tightening or loosening of the bolts, so it can free the human from the operation of disassembling and assembling the bolts, thereby reducing labor costs, reducing operation risks, and improving operation efficiency. Secondly, as long as the rotation angle is set in advance, the automatic loading and unloading machine can tighten or loosen all the inner cover bolts 41 on the inner cover 4 in the designed order. In the prior art, it is very easy to have the problem of wrong tightening position, missed tightening, and repeated tightening when manually tightening the bolts. In addition, the third driving device 34 in the automatic screwing mechanism 3 of the present invention can be completely set as a servo motor, that is, the servo motor is used to provide power for the screwing sleeve 32, so as to tighten or loosen the inner cover bolt 41. The automatic screwing mechanism 3 in the present invention automatically screws the inner cover bolt 41, with high screwing accuracy and fewer and shorter connecting pipelines. In the prior art, a hydraulic wrench is used to screw the inner cover bolt 41. The working pressure of the hydraulic wrench is large, the danger is large, and the pipeline between the hydraulic wrench and the hydraulic station makes the site more chaotic.

[0037] Please refer to the attached Figure 3 , Attachment Figure 4 , Attachment Figure 6 In a specific embodiment of the present invention, three support arms 23 are provided, and the three support arms 23 are evenly arranged around the rotating body 21, that is, the angle between two adjacent support arms 23 is 120°. An automatic screwing mechanism 3 is connected to each support arm 23. Then three inner cover bolts 41 can be screwed at one time, and the three inner cover bolts 41 are distributed at 120°. An O-ring is provided on the circumferential surface of the inner cover 4 of the spent fuel transport container. Screwing the three inner cover bolts 41 distributed at 120° at one time can ensure that the O-ring is evenly stressed, avoid the problem of damage to the O-ring due to eccentric load, and ensure the sealing performance of the O-ring.

[0038] By adopting a three-axis tightening solution, 42 inner cover bolts 41 can be automatically tightened / loosened within 30 minutes.

[0039] In order to facilitate the screwing sleeve 32 to screw the inner cover bolt 41 smoothly, the automatic screwing mechanism 3 in the present invention also includes a reaction force compensation sleeve 33. There are two reaction force compensation sleeves 33, which are distributed on both sides of the screwing sleeve 32, and the two reaction force compensation sleeves 33 are connected to the screwing shaft support plate 30. When the automatic lifting mechanism 1 drives the screwing sleeve 32 to be sleeved on the head of a certain inner cover bolt 41, the two reaction force compensation sleeves 33 will be sleeved on the heads of the two inner cover bolts 41 on the left and right sides of the inner cover bolt 41 at the same time. Under the reaction force of the reaction force compensation sleeve 33, the screwing sleeve 32 can smoothly tighten the inner cover bolt 41.

[0040] In order to ensure that the third driving device 34, that is, the servo motor can output a suitable rotation speed, the present invention sets a planetary reducer 35 and a final reducer 37 between the servo motor and the screwing sleeve 32. The motor shaft of the servo motor is connected to the input shaft of the planetary reducer 35, the output shaft of the planetary reducer 35 is connected to the input shaft of the final reducer 37, and the output shaft of the final reducer 37 is connected to the output spline shaft 39. The screwing sleeve 32 is connected to the spline shaft. In addition, in order to control the torque of the servo motor, a torque sensor 36 can also be set between the planetary reducer 35 and the final reducer 37. The housing of the final reducer 37 is connected to the bracket 38, and the bracket 38 is connected to the screwing shaft support plate 30, so that the servo motor, the planetary reducer 35, the torque sensor 36, the final reducer 37, the output spline shaft 39, and the screwing sleeve 32 are all supported by the screwing shaft support plate 30.

[0041] In order to facilitate the connection between the lifting body 11 and the automatic rotating mechanism 2, the present invention provides a first flange 17 at the end of the lifting body 11 away from the fixed body, and provides a second flange 25 at the end of the base of the automatic rotating mechanism 2 away from the rotating body 21. The first flange 17 and the second flange 25 are connected in cooperation, so as to lock the automatic rotating mechanism 2 on the lifting body 11.

[0042] Please refer to the attached Figure 4 and attached Figure 5 The first driving device 16 in the automatic lifting mechanism 1 can be a driving motor, which drives the rotating body 21 to rotate. Specifically, the motor shaft of the driving motor is connected to the input shaft of the worm gear reducer, and the output shaft of the worm gear reducer is connected to the screw mechanism. The worm gear not only reduces the speed of the motor shaft, but also converts the horizontal rotation of the motor shaft into vertical rotation, and the screw mechanism converts the vertical rotation into vertical movement, thereby driving the lifting body 11 to move up and down.

[0043] The automatic lifting mechanism also includes a base 15, which includes a base body and a connecting arm. A base connector 18 is provided at one end of the connecting arm away from the base body. A through hole is provided on the base connector 18, which is used in conjunction with the threaded hole on the inner cover 4, so that the base connector 18 can be locked on the inner cover 4 by bolts.

[0044] The fixed body in the automatic lifting mechanism 1 includes a first fixed body 13 and a second fixed body 14. The second fixed body 14 is arranged above the first fixed body 13. The lifting body 11 penetrates the second fixed body 14 along the lifting direction. The outer diameter of the first fixed body 13 is greater than the outer diameter of the second fixed body 14. In this way, the stability of the fixed body chassis is improved, and the occupied space of the bolt automatic loading and unloading machine is reduced.

[0045] In order to ensure the firmness of the connection between the first fixing body 13 and the second fixing body 14, the present invention provides a reinforcing plate, one side of the reinforcing plate is connected to the second fixing body 14, and the other side is connected to the first fixing body 13. There are multiple reinforcing plates arranged around the second fixing body 14.

[0046] In order to ensure that the lifting body 11 moves up and down accurately, the present invention is provided with a linear guide rail 12 on the lifting body 11, and the linear guide rail 12 extends along the lifting direction of the lifting body 11. A linear bearing is provided inside the second fixed body 14, and the linear guide rail 12 is slidably fitted in the linear bearing. The cooperation between the linear bearing and the linear guide rail 12 forms a guiding effect on the lifting body 11, and at the same time, the linear bearing can reduce the friction with the linear guide rail 12 to ensure that the linear guide rail 12 slides up and down smoothly.

[0047] In the present invention, the first fixed body 13 is designed as a cylinder, and the second fixed body 14 is designed as a cuboid. In addition, a plurality of linear guides 12 are provided on the lifting body 11, and the plurality of linear guides 12 are arranged at intervals around the lifting body 11. Correspondingly, a plurality of linear bearings are provided on the second fixed body 14, and each linear guide 12 is matched in a linear bearing. Specifically, the linear guides 12 can be provided to be evenly arranged in three or four.

[0048] In addition, since the second fixing body 14 is a rectangular parallelepiped and the side surfaces of the rectangular parallelepiped are planes, components can be connected to the side surfaces of the rectangular parallelepiped.

[0049] The second driving device 22 in the automatic rotating mechanism 2 can be specifically a rotating drive motor. The rotating body 21 includes a gear plate 24. The motor shaft of the rotating drive motor is connected to a pinion, which meshes with the gear plate 24. The rotating drive motor drives the rotating body 21 to rotate through the pinion and the gear plate 24.

[0050] The method of using the automatic loading and unloading machine for bolts of spent fuel transport container in the present invention is as follows:

[0051] (1) When in use, the bolt automatic loading and unloading machine is hoisted on the inner cover 4 of the spent fuel transport container. The bolt automatic loading and unloading machine and the inner cover 4 are securely connected and fixed together by using the four threaded holes for hoisting on the inner cover 4 and the through holes on the base connector, and the alignment is adjusted.

[0052] (2) After checking that the bolt automatic loader and unloader and the cables connected to the control cabinet are all correct, power can be supplied to the bolt automatic loader and unloader. After power is supplied, the system will first perform a self-check. If there is an abnormality, the system will have a corresponding code prompt; if the self-check is normal, the bolt automatic loader and unloader will enter the standby state.

[0053] (3) Manually operate the automatic rotating mechanism 2 through the operation panel to rotate so that the three screwing sleeves 32 in the three automatic screwing mechanisms 3 are aligned with the three inner cover bolts 41 respectively;

[0054] (4) Press the "Start" button on the operation panel, and the automatic lifting mechanism 1 automatically descends, so that the screw sleeve 32 and the corresponding inner cover bolt 41 are docked. After docking, tightening automatically starts, and tightening automatically stops after tightening to a predetermined torque. The automatic lifting mechanism 1 automatically rises, so that the screw sleeve 32 and the corresponding inner cover bolt 41 are separated, and the automatic rotation mechanism 2 automatically rotates to the angle position of the next group of inner cover bolts 41. The lifting mechanism 1 automatically descends, so that the screw sleeve 32 and the corresponding inner cover bolt 41 are docked. After docking, tightening automatically starts, and tightening automatically stops after tightening to a predetermined torque... and so on. After all the inner cover bolts 41 are tightened, the bolt automatic loading and unloading machine automatically stops running.

[0055] The loosening process is similar to the tightening process, except that the tightening shaft moves in the opposite direction. During the tightening / loosening process, if you need to stop in the middle, you can press the "Stop / Reset" button on the operation panel, and the system will immediately stop the ongoing tightening action. If an emergency occurs during the tightening process, you can press the "Emergency Stop" button on the operation panel, the system power will be cut off, and the equipment will stop running immediately.

[0056] In summary, the automatic bolt loading and unloading machine for spent fuel transport container in the present invention has the following beneficial effects:

[0057] First, fully automatic control: the entire tightening / loosening process is fully automatically controlled without manual intervention.

[0058] Second, multi-axis combination is used: the three screwing sleeves 32 are evenly distributed in a 120° circle, and three inner cover bolts 41 can be tightened at the same time, with good symmetry, smoother screwing effect, higher efficiency, and more uniform force on the O-rings on the four peripheral surfaces of the inner cover than single-axis screwing, so the sealing effect is better and it is not easy to cause damage to the O-rings due to eccentric load.

[0059] Third, high screwing precision: the automatic loading and unloading machine not only has torque control function, but also has angle control, torque plus angle control and yield control functions. The torque precision is better than ±3%, and the angle control precision is ±1%. It is the tightening equipment with the highest actual control precision on site.

[0060] Fourth, high efficiency: the maximum speed of the screwing sleeve 32 in the automatic screwing mechanism 3 can reach 20 rpm, which is more than 10 times that of a hydraulic wrench.

[0061] Fifth, no oil pollution and low noise: without the hydraulic station, there will be no oil leakage problem, and there will be no noise generated by the hydraulic station.

[0062] Finally, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0063] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0064] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An automatic bolt loading and unloading machine for spent fuel transport container, characterized in that: include: An automatic lifting mechanism (1), the automatic lifting mechanism (1) comprising a lifting body (11), a fixed body, and a first driving device (16), the lifting body (11) being arranged above the fixed body, the first driving device (16) being arranged on the fixed body, the first driving device (16) being used to drive the lifting body (11) to move up and down, and the fixed body being connectable to a cover body of a bolt to be disassembled; An automatic rotating mechanism (2), the automatic rotating mechanism (2) comprising a base, a rotating body (21), a support arm (23), and a second driving device (22), the support arm (23) being connected to the rotating body (21), the rotating body (21) being rotatably connected to the base, the second driving device (22) being used for driving the rotating body (21) to rotate, and the base being connected to the lifting body (11); An automatic screwing mechanism (3) comprises a screwing shaft support plate (30), a third driving device (34), and a screwing sleeve (32); the screwing sleeve (32) is adapted to the head of a bolt to be disassembled; the third driving device (34) is used to drive the screwing sleeve (32) to rotate; the screwing shaft support plate (30) is used to support the third driving device (34) and the screwing sleeve (32); the screwing shaft support plate (30) is connected to the support arm (23).

2. The automatic bolt loading and unloading machine for spent fuel transport container according to claim 1, characterized in that: There are three support arms (23), which are evenly arranged around the rotating body (21), and each support arm (23) is connected to one of the automatic screwing mechanisms (3).

3. The automatic bolt loading and unloading machine for spent fuel transport container according to claim 1, characterized in that: The automatic screwing mechanism (3) further comprises a reaction force offsetting sleeve (33), wherein the number of the reaction force offsetting sleeves (33) is two, the two reaction force offsetting sleeves (33) are distributed on both sides of the screwing sleeve (32), and the two reaction force offsetting sleeves (33) are bolted to the screwing shaft support plate (30).

4. The automatic bolt loading and unloading machine for spent fuel transport container according to claim 1, characterized in that: The automatic screwing mechanism (3) further comprises a planetary reducer (35), a final reducer (37), a bracket (38) and an output spline shaft (39); the input shaft of the planetary reducer (35) is connected to the output end of the third drive device (34); the output shaft of the planetary reducer (35) is connected to the input shaft of the final reducer (37); the output shaft of the final reducer (37) is connected to the output spline shaft (39); the screwing sleeve (32) is connected to the spline shaft; the housing of the final reducer (37) is connected to the bracket (38); and the bracket (38) is connected to the screwing shaft support plate (30).

5. The automatic bolt loading and unloading machine for spent fuel transport container according to claim 1, characterized in that: A first flange (17) is arranged at one end of the lifting body (11) away from the fixed body, a second flange (25) is arranged on the base, and the first flange (17) and the second flange (25) are matched and connected.

6. The automatic bolt loading and unloading machine for spent fuel transport container according to claim 1, characterized in that: The first driving device (16) is a driving motor, the motor shaft of the driving motor is connected to a worm gear reducer, the worm gear reducer is connected to a screw mechanism, and the screw mechanism is connected to the lifting body (11).

7. The automatic bolt loading and unloading machine for spent fuel transport container according to claim 1, characterized in that: The automatic lifting mechanism (1) also includes a base (15), the base (15) including a base body and a connecting arm, one end of the connecting arm is connected to the base body, and the other end is provided with a base connecting piece (18), and the base connecting piece (18) is provided with a through hole, and the through hole is used in conjunction with a threaded hole on a cover body of a bolt to be disassembled.

8. The automatic bolt loading and unloading machine for spent fuel transport container according to claim 1, characterized in that: The fixed body comprises a first fixed body (13) and a second fixed body (14); the second fixed body (14) is arranged above the first fixed body (13); the lifting body (11) penetrates the second fixed body (14) along the lifting direction; and the outer diameter of the first fixed body (13) is greater than the outer diameter of the second fixed body (14).

9. The automatic bolt loading and unloading machine for spent fuel transport container according to claim 8, characterized in that: The lifting body (11) is provided with a linear guide rail (12) extending along the lifting direction of the lifting body, and a linear bearing is provided inside the second fixed body (14), and the linear guide rail is slidably fitted in the linear bearing.

10. The automatic bolt loading and unloading machine for spent fuel transport container according to claim 9, characterized in that: The second fixed body (14) is a rectangular parallelepiped, and a plurality of the linear guide rails (12) are arranged around the lifting body (11), and each of the linear guide rails (12) is slidably fitted in one of the linear bearings.

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