Inner shell cutting device for reactor body decommissioning

Abstract

The utility model discloses an inner shell cutting device for reactor body decommissioning, which comprises a pipe cutting workbench, a barrel grabbing arm arranged at the top of the pipe cutting workbench, a shell grabbing arm arranged at the front end of the top of the pipe cutting workbench, and a block grabbing arm arranged at the front end of the top of the pipe cutting workbench. The block grabbing arm is arranged on the right side of the shell grabbing arm, the annular cutting workbench is arranged at the bottom of the pipe cutting workbench, and the slitting workbench is arranged in the pipe cutting workbench. Through cooperation of the body grabbing arm, the block grabbing arm, the annular cutting workbench, the slitting workbench, the inner pipe cutting arm, the grabbing unit and the block cutting arm, accurate control can be achieved, a large amount of radioactive aerosol is reduced during production, the problems of sight blocking and the like are solved, accurate control can be achieved in the remote operation process, and the production efficiency is improved. Cold cutting can be achieved, radioactive contamination is reduced, and cutting efficiency and safety are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to nuclear reactor decommissioning technical field, concretely is a kind of inner shell cutting device for stack body decommissioning. BACKGROUND

[0002] Nuclear reactor is finally shut down after completing its research mission, enters the decommissioning phase of exit operation. Reactor decommissioning refers to during this period, nuclear fuel in reactor, radioactive equipment, components, materials will be removed from reactor or from reactor system to remove reactor area, to achieve the purpose of open use without restriction. The decommissioning process of reactor mainly has three steps: removal of equipment, building and system; decontamination process; waste treatment.

[0003] In the decommissioning process of nuclear reactor, the inner shell cutting of stack body is a key step, the existing inner shell cutting method mostly adopts hot cutting technology, but this method has problems such as generating a large amount of radioactive aerosol, obstructing vision, and it is difficult to realize accurate control in remote operation process, cannot realize cold cutting, increases radioactive contamination, reduces cutting efficiency and safety. UTILITY MODEL CONTENT

[0004] To solve the problems presented in the above background art, the purpose of the utility model is to provide an inner shell cutting device for stack body decommissioning, which has the advantage of accurate control, and solves the problem of difficult accurate control of inner shell cutting device.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: an inner shell cutting device for stack body decommissioning, comprising:

[0006] Pipe cutting workbench;

[0007] Cylinder grabbing arm, the cylinder grabbing arm is arranged at the top of pipe cutting workbench;

[0008] Shell grabbing arm, the shell grabbing arm is arranged at the front end of the top of pipe cutting workbench;

[0009] Block grabbing arm, the block grabbing arm is arranged at the right side of shell grabbing arm;

[0010] Ring cutting workbench, the ring cutting workbench is arranged at the bottom of pipe cutting workbench;

[0011] Splitting workbench, the splitting workbench is arranged inside pipe cutting workbench;

[0012] Inner pipe cutting arm, the inner pipe cutting arm is arranged at the back of cylinder grabbing arm;

[0013] Grabbing unit, the grabbing unit is arranged at the bottom of cylinder grabbing arm;

[0014] A block cutting arm is arranged at the back of the pipe cutting workbench.

[0015] As preferred in the utility model, the pipe cutting workbench comprises a main body frame, the front end of the left side of the inner wall of the main body frame is fixedly connected with the pipe cutting workbench, and the right side of the pipe cutting workbench is movably connected with the FA-IV steel box.

[0016] As preferred in the utility model, the shell grabbing arm comprises an up-down feeding mechanism one, the bottom of the up-down feeding mechanism one is movably connected with a clamping jaw replacement mechanism, the bottom of the clamping jaw replacement mechanism is movably installed with a thin-wall clamp, the front of the clamping jaw replacement mechanism is movably installed with a pipe clamp, the bottom of the up-down feeding mechanism one is movably installed with a crossbeam one, and the bottom of the crossbeam one is fixedly connected with the front end of the top of the main body frame.

[0017] As preferred in the utility model, the block grabbing arm comprises an up-down feeding mechanism two, the bottom of the up-down feeding mechanism two is fixedly connected with the right side of the top of the crossbeam one, the bottom of the up-down feeding mechanism two is movably installed with a hydraulic clamping mechanism, the bottom of the hydraulic clamping mechanism is movably connected with a flow distribution chamber, and the flow distribution chamber is a quarter flow distribution chamber.

[0018] As preferred in the utility model, the ring cutting workbench comprises a rotating mechanism one, the inside of the rotating mechanism one is movably installed with a bag clamping mechanism, and the right side of the back of the rotating mechanism one is movably connected with a cutting mechanism one.

[0019] As preferred in the utility model, the splitting workbench comprises a transverse motion mechanism, the top of the transverse motion mechanism is movably connected with a rotating mechanism two, the top of the rotating mechanism two is movably installed with a clamping mechanism, and the top of the clamping mechanism is movably installed with a pressing mechanism.

[0020] As preferred in the utility model, the inner pipe cutting arm comprises an up-down feeding mechanism three, the bottom of the up-down feeding mechanism three is fixedly installed with a cutting mechanism, the front end and the rear end of the bottom of the up-down feeding mechanism three are fixedly connected with a crossbeam two, and the bottom of the crossbeam two is fixedly connected with the top of the main body frame.

[0021] As preferred in the utility model, the grabbing unit comprises a lifting platform, the surface of the lifting platform is movably connected with a rotatable hook, the bottom of the lifting platform is movably installed with an inner supporting claw, the top of the lifting platform is fixedly connected with the bottom of the cylinder grabbing arm, the front face and the back face of the cylinder grabbing arm are movably installed with a crossbeam three, and the bottom of the crossbeam three is fixedly connected with the top of the main body frame.

[0022] As the utility model is preferred, the block cutting arm includes a lifting mechanism, a horizontal feed mechanism is fixedly installed at the bottom of the lifting mechanism, a rotating mechanism three is movably installed at the bottom of the horizontal feed mechanism, and a cutting mechanism two is movably installed at the front end of the right side of the rotating mechanism three.

[0023] Compared with the prior art, the utility model has the beneficial effects as follows:

[0024] 1、The utility model discloses a shell grabbing arm, a block grabbing arm, a ring cutting workbench, a cutting workbench, an inner tube cutting arm, a grabbing unit and the cooperation of the block cutting arm can realize accurate control, reduce a large amount of radioactive aerosol when generating, avoid the problem that the line of sight is blocked and the like, and accurate control can be realized in the remote operation process, cold cutting can be realized, radioactive pollution can be reduced, and cutting efficiency and safety can be improved.

[0025] 2、The utility model discloses a pipe cutting workbench can complete the cutting of the inner shell lower portion water pipe, the workbench is installed on the main body frame, is composed of longitudinal feed mechanism and cutting blade, the grabbing unit grabs partial inner shell cylinder and water pipe to the FA-IV box upper portion, the longitudinal feed mechanism drives the cutting blade to cut the nearest water outlet pipe, the rotating mechanism of the grabbing unit lower portion drives the inner shell to rotate, completes the cutting of the remaining water pipe, and the cut water pipe directly falls into the FA-IV box.

[0026] 3、The utility model discloses a shell grabbing arm can grab and transport the cut inner shell block to the FA-IV steel box, the shell grabbing arm is installed on the crossbeam one, can make transverse, longitudinal and up-down feed movement under the driving of the crossbeam one, the lower end of the grabbing arm is installed with the jaw replacement mechanism, through the rotation, can realize the placement of each angle of pipe clamp and thin wall clamp to complete the grabbing of the cut inner shell internal water pipe and inner shell cylinder wall. ACCURACY

[0027] Figure 1 It is the utility model structural drawing;

[0028] Figure 2 It is the utility model Figure 1 It is the three-dimensional structure diagram of grabbing unit in the utility model;

[0029] Figure 3 It is the utility model Figure 1 It is the three-dimensional structure diagram of ring cutting workbench in the utility model;

[0030] Figure 4 It is the utility model Figure 1 It is the left three-dimensional structure diagram of cutting workbench in the utility model;

[0031] Figure 5 It is the utility model Figure 1 It is the left three-dimensional structure diagram of lifting mechanism in the utility model;

[0032] Figure 6 For the utility model Figure 1 The left side perspective structure diagram of the inner tube cutting arm in the shell body;

[0033] Figure 7 For the utility model Figure 1 The right side perspective structure diagram of the block body grabbing arm in the shell body;

[0034] Figure 8 For the utility model Figure 1 The rear perspective structure diagram of the block body grabbing arm in the shell body;

[0035] Figure 9 For the utility model Figure 1 The perspective structure diagram of the pipe cutting workbench in the shell body;

[0036] Figure 10 For the utility model Figure 1 The process flow diagram of the shell body.

[0037] In the figure: 1, pipe cutting workbench; 101, main body frame; 102, workbench; 103, FA-IV steel box; 2, cylinder grabbing arm; 3, shell body grabbing arm; 31, up-down feeding mechanism one; 32, clamping jaw replacement mechanism; 33, thin-walled clamp; 34, pipe clamp; 4, block body grabbing arm; 41, up-down feeding mechanism two; 42, hydraulic clamping mechanism; 43, flow distribution chamber; 5, ring cutting workbench; 51, rotating mechanism one; 52, wrapping clamp mechanism; 53, cutting mechanism one; 6, splitting workbench; 61, transverse motion mechanism; 62, rotating mechanism two; 63, clamping mechanism; 64, pressing mechanism; 7, inner tube cutting arm; 71, up-down feeding mechanism three; 72, cutting mechanism; 8, grabbing unit; 81, lifting platform; 82, rotatable hook claw; 83, inner support claw; 9, block cutting arm; 91, lifting mechanism; 92, transverse feeding mechanism; 93, rotating mechanism three; 94, cutting mechanism two; 10, cross beam one; 11, cross beam two; 12, cross beam three. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0039] As Figures 1 to 10 shown, the utility model provides a kind of for the inner shell cutting device of body decommissioning, comprising:

[0040] Pipe cutting workbench 1;

[0041] The cylinder gripping arm 2 is located on top of the pipe cutting workbench 1;

[0042] The housing gripping arm 3 is located at the front end of the top of the pipe cutting workbench 1;

[0043] Block gripping arm 4 is located on the right side of housing gripping arm 3;

[0044] The circumferential cutting workbench 5 is located at the bottom of the pipe cutting workbench 1;

[0045] The slitting workbench 6 is located inside the tube cutting workbench 1;

[0046] Inner tube cutting arm 7, which is located on the back of cylinder gripping arm 2;

[0047] The gripping unit 8 is located at the bottom of the cylindrical gripping arm 2;

[0048] The segmented cutting arm 9 is located on the back of the pipe cutting workbench 1.

[0049] refer to Figure 9 The pipe cutting workbench 1 includes a main frame 101, a workbench 102 is fixedly connected to the left side of the back wall of the main frame 101, and an FA-IV steel box 103 is movably connected to the right side of the workbench 102.

[0050] As a technical optimization of this utility model, by setting up a pipe cutting workbench 1, the cutting of the lower water pipe of the inner shell can be completed. The workbench 102 is installed on the main frame 101 and consists of a longitudinal feeding mechanism and a cutting blade. The gripping unit 8 grips part of the inner shell cylinder and water pipe to the upper part of the FA-IV box. The longitudinal feeding mechanism drives the cutting blade to cut the nearest water outlet pipe. The rotating mechanism at the lower part of the gripping unit 8 drives the inner shell to rotate, completing the cutting of the remaining water pipe. The cut water pipe falls directly into the FA-IV box.

[0051] refer to Figure 7 The housing gripping arm 3 includes an up-and-down feeding mechanism 31, a gripper changing mechanism 32 is movably connected to the bottom of the up-and-down feeding mechanism 31, a thin-walled clamp 33 is movably mounted at the bottom of the gripper changing mechanism 32, a pipe clamp 34 is movably mounted at the front of the gripper changing mechanism 32, a crossbeam 10 is movably mounted at the bottom of the up-and-down feeding mechanism 31, and the bottom of the crossbeam 10 is fixedly connected to the front end of the top of the main frame 101.

[0052] As a technical optimization scheme of the utility model, through setting up the shell grabbing arm 3, the cut inner shell block can be grabbed and transported to the FA-IV steel box 103, the shell grabbing arm 3 is installed on the crossbeam one 10, and under the driving of the crossbeam one 10, transverse, longitudinal and up-down feeding movements can be made, the lower end of the grabbing arm is provided with the jaw replacing mechanism 32, through the rotation, the angular placement of the pipe clamp 34 and the thin-walled clamp 33 can be realized, so as to complete the grabbing of the cut inner shell internal water pipe and inner shell cylinder wall.

[0053] Reference Figure 8 The block grabbing arm 4 includes the up-down feeding mechanism two 41, the bottom of the up-down feeding mechanism two 41 is fixedly connected with the right side of the top of the crossbeam one 10, the bottom of the up-down feeding mechanism two 41 is movably provided with the hydraulic clamping mechanism 42, the bottom of the hydraulic clamping mechanism 42 is movably connected with the flow distribution chamber 43, and the flow distribution chamber 43 is a quarter flow distribution chamber.

[0054] As a technical optimization scheme of the utility model, through setting up the block grabbing arm 4, the cut flow distribution chamber block can be grabbed and transported, the lower end of the block grabbing arm 4 is provided with the hydraulic clamping mechanism 42, the upper and lower surfaces of the flow distribution chamber 43 are clamped, and through the movement mechanism in each direction, the flow distribution chamber 43 is sent to the FA-IV steel box 103.

[0055] Reference Figure 3 The ring cutting workbench 5 includes the rotating mechanism one 51, the rotating mechanism one 51 is movably provided with the embracing clamp mechanism 52 in the inside, and the back right side of the rotating mechanism one 51 is movably connected with the cutting mechanism one 53.

[0056] As a technical optimization scheme of the utility model, through setting up the ring cutting workbench 5, the inner shell upper and lower cylinder bodies can be transversely cut, the ring cutting workbench 5 is provided with three embracing clamp mechanisms, and the jaws of the embracing clamp mechanisms are clamped to the inner shell outer wall under the pushing of the hydraulic cylinder.

[0057] Reference Figure 4 The splitting workbench 6 includes the transverse movement mechanism 61, the top of the transverse movement mechanism 61 is movably connected with the rotating mechanism two 62, the top of the rotating mechanism two 62 is movably provided with the clamping mechanism 63, and the top of the clamping mechanism 63 is movably provided with the pressing mechanism 64.

[0058] As a technical optimization scheme of the utility model, through setting cutting workbench 6, can carry out conveying and clamping to inner shell cylinder and flow distribution chamber 43, cutting workbench 6 is composed of transverse motion mechanism 61, rotating mechanism two 62, clamping mechanism 63 and pressing mechanism 64, transverse motion mechanism 61 drives workbench 102 to move laterally above the buried well, grabbing unit 8 clamps the cut 600mm high cylinder to the clamping mechanism 63 of cutting workbench 6, clamping mechanism 63 is telescopic through eight sets of clamping blocks, clamps the cylinder, pressing mechanism 64 rotates and presses down, and the cylinder is pressed on cutting workbench 6, rotating mechanism two 62 drives the cylinder to rotate, and cooperates the cutter on segmented cutting arm 9, and the cylinder is cut into eight pieces.

[0059] Reference Figure 6 The inner tube cutting arm 7 includes an up-down feeding mechanism three 71, the bottom of the up-down feeding mechanism three 71 is fixedly installed with a cutting mechanism 72, and the front end and the rear end of the bottom of the up-down feeding mechanism three 71 are fixedly connected with a cross beam two 11.

[0060] As a technical optimization scheme of the utility model, through setting inner tube cutting arm 7, the inner tube cutting arm 7 is installed on the cross beam two 11, and under the driving of the cross beam two 11, transverse, longitudinal and lifting feeding movements are completed, the cutting mechanism 72 is installed at the lower end of the cutting arm, and the circular saw cutter completes cutting of the inner water pipe under the driving of the motor.

[0061] Reference Figure 2 The grabbing unit 8 includes a lifting platform 81, the surface of the lifting platform 81 is movably connected with a rotatable hook claw 82, the bottom of the lifting platform 81 is movably installed with an inner supporting claw 83, the top of the lifting platform 81 is fixedly connected with the bottom of the cylinder grabbing arm 2, the front face and the back face of the cylinder grabbing arm 2 are movably installed with a cross beam three 12, and the bottom of the cross beam three 12 is fixedly connected with the top of the main frame 101.

[0062] As a technical optimization scheme of the utility model, through setting grabbing unit 8, the grabbing unit 8 can be used as a main part of the lifting well mechanism, the grabbing and lifting of the inner shell are completed, the grabbing and releasing of the inner shell are completed through the telescoping of the inner supporting claw 83 of the grabbing unit 8, and the inner shell cylinder cut down can be firmly hooked and not fallen off through the setting of the reversible hook claw and the lifting platform of the grabbing unit 8.

[0063] Reference Figure 5 The segmented cutting arm 9 includes a lifting mechanism 91, the bottom of the lifting mechanism 91 is fixedly installed with a transverse feeding mechanism 92, the bottom of the transverse feeding mechanism 92 is movably installed with a rotating mechanism three 93, and the front end of the right side of the rotating mechanism three 93 is movably installed with a cutting mechanism two 94.

[0064] As a technical optimization scheme of the utility model, through setting block cutting arm 9, can carry out longitudinal cutting to inner shell cylinder and flow distribution chamber 43, and cutting to sampling piece, block cutting arm 9 is composed of lifting mechanism 91, transverse feeding mechanism 92, rotating mechanism three 93 and cutting mechanism two 94, lifting mechanism 91 drives cutter to do up and down feeding movement, transverse feeding mechanism 92 drives cutter to do cutting depth feeding movement, rotating mechanism three 93 drives cutter to do 90 ° rotation, realizes horizontal cutting and longitudinal cutting, block cutting arm 9 is installed on crossbeam four, can do transverse movement as a whole, rotates with cutting workbench 6, completes the cutting of inner shell cylinder and flow distribution chamber 43.

[0065] The working principle and use process of the utility model are as follows: when in use, the inner shell is lifted from the buried well to a specified height by the cylinder grabbing arm 2 and the grabbing unit 8, then the ring cutting workbench 5 is used to clamp the outer wall of the inner shell by the clamping mechanism, and the inner shell is cut by the rotating cutter after completion, the cutting height is 600mm each time, then the cut inner shell cylinder is sent to the cutting workbench 6 by the grabbing unit 8, the inner shell cylinder is clamped and fixed by the clamping mechanism 63 on the cutting workbench 6, then the transverse and up-and-down feeding of the block cutting arm 9 is used to complete the longitudinal cutting of the inner shell cylinder wall, the cutting workbench 6 is rotated, and the previous action is repeated until the inner shell is cut into eight equal parts, then the cut inner shell pieces are transported to the FA-IV steel box 103 by the shell grabbing arm 3, the above operation is repeated until the outer wall of the inner shell is level with the highest water pipe inside, then the inner pipe cutting arm 7 is used to cut the water pipes extending out of the inner shell one by one in sections, then the cut water pipes are transported to the FA-IV steel box 103 by the shell grabbing arm 3, then the remaining inner shell is grabbed to above the FA-IV steel box 103 by the grabbing unit 8, the water pipes at the lower part of the inner shell are cut off one by one in sections by the cutter on the workbench 102 and fall into the FA-IV box, then the remaining flow distribution chamber 43 is grabbed to the cutting platform by the grabbing unit 8, cut into four equal parts by the block cutting arm 9, and then the cut flow distribution chamber 43 pieces are transported to the FA-IV steel box 103 by the block body grabbing arm 4.

[0066] In conclusion: the inner shell cutting device for the decommissioning of the reactor vessel can realize accurate control, reduce a large amount of radioactive aerosol, avoid the problem of obstructed view, realize accurate control in the remote operation process, realize cold cutting, reduce radioactive pollution, improve cutting efficiency and safety by the cooperation of the shell grabbing arm 3, the block body grabbing arm 4, the ring cutting workbench 5, the cutting workbench 6, the inner pipe cutting arm 7, the grabbing unit 8 and the block cutting arm 9.

[0067] It is to be noted that, in the present document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0068] While the embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made therein without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.

Claims

1. An inner shell cutting device for decommissioning a reactor vessel, characterized by, Include: Pipe cutting workbench (1); Barrel grabbing arm (2), the barrel grabbing arm (2) is set on the top of pipe cutting workbench (1); Shell grabbing arm (3), the shell grabbing arm (3) is set on the front end of the top of pipe cutting workbench (1); Block grabbing arm (4), the block grabbing arm (4) is set on the right side of shell grabbing arm (3); Ring cutting workbench (5), the ring cutting workbench (5) is set on the bottom of pipe cutting workbench (1); Split cutting workbench (6), the split cutting workbench (6) is set in pipe cutting workbench (1); Inner tube cutting arm (7), the inner tube cutting arm (7) is set on the back of barrel grabbing arm (2); Grabbing unit (8), the grabbing unit (8) is set on the bottom of barrel grabbing arm (2); Split block cutting arm (9), the split block cutting arm (9) is set on the back of pipe cutting workbench (1).

2. An inner shell cutting device for decommissioning a reactor vessel, according to claim 1, wherein: The pipe cutting workbench (1) includes a main frame (101), the left side of the inner wall of the main frame (101) is fixedly connected with the front end of the pipe cutting workbench (1), and the right side of the pipe cutting workbench (1) is movably connected with an FA-IV steel box (103).

3. An inner shell cutting device for decommissioning a reactor vessel, according to claim 2, wherein: The shell grabbing arm (3) includes an up-down feeding mechanism one (31), the bottom of the up-down feeding mechanism one (31) is movably connected with a jaw replacing mechanism (32), the bottom of the jaw replacing mechanism (32) is movably mounted with a thin-wall clamp (33), the front of the jaw replacing mechanism (32) is movably mounted with a pipe clamp (34), the bottom of the up-down feeding mechanism one (31) is movably mounted with a cross beam one (10), and the bottom of the cross beam one (10) is fixedly connected with the front end of the top of the main frame (101).

4. An inner shell cutting device for decommissioning a reactor vessel according to claim 3, characterized in that: The block grabbing arm (4) includes an up-down feeding mechanism two (41), the bottom of the up-down feeding mechanism two (41) is fixedly connected with the right side of the top of the cross beam one (10), the bottom of the up-down feeding mechanism two (41) is movably mounted with a hydraulic clamping mechanism (42), the bottom of the hydraulic clamping mechanism (42) is movably connected with a flow distribution chamber (43), and the flow distribution chamber (43) is a one-fourth flow distribution chamber.

5. An inner shell cutting device for decommissioning a reactor vessel according to claim 4, characterized in that: The ring cutting workbench (5) includes a rotating mechanism one (51), the inside of the rotating mechanism one (51) is movably mounted with a bag clamping mechanism (52), and the right side of the back of the rotating mechanism one (51) is movably connected with a cutting mechanism one (53).

6. An inner shell cutting device for decommissioning a reactor vessel according to claim 5, wherein: The split cutting workbench (6) includes a transverse motion mechanism (61), the top of the transverse motion mechanism (61) is movably connected with a rotating mechanism two (62), the top of the rotating mechanism two (62) is movably mounted with a clamping mechanism (63), and the top of the clamping mechanism (63) is movably mounted with a pressing mechanism (64).

7. An inner shell cutting device for decommissioning a reactor vessel, according to claim 6, wherein: The inner tube cutting arm (7) includes an up-down feeding mechanism three (71), the bottom of the up-down feeding mechanism three (71) is fixedly mounted with a cutting mechanism (72), the front end and the rear end of the bottom of the up-down feeding mechanism three (71) are fixedly connected with a cross beam two (11), and the bottom of the cross beam two (11) is fixedly connected with the top of the main frame (101).

8. An inner shell cutting device for decommissioning a reactor vessel according to claim 7, characterized in that: Said grabbing unit (8) includes a lifting platform (81), the surface of lifting platform (81) is movably connected with rotatable hook (82), the bottom of lifting platform (81) is movably installed with inner support claw (83), the top of lifting platform (81) is fixedly connected with the bottom of cylinder grabbing arm (2), the front and back of cylinder grabbing arm (2) are movably installed with crossbeam three (12), the bottom of crossbeam three (12) is fixedly connected with the top of main body frame (101).

9. An inner shell cutting device for decommissioning a reactor vessel according to claim 8, characterized in that: Said block cutting arm (9) includes lifting mechanism (91), the bottom of lifting mechanism (91) is fixedly installed with transverse feeding mechanism (92), the bottom of transverse feeding mechanism (92) is movably installed with rotating mechanism three (93), the front end of rotating mechanism three (93) right side is movably installed with cutting mechanism two (94).

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