A special deep hole drilling machine for deep hole multi-controlled deep hole processing of nuclear spent fuel storage and transportation containers

Abstract

The present invention discloses a special deep hole drilling machine for deep hole CNC deep hole processing of nuclear spent fuel storage and transportation containers, comprising a drill pipe bed and a workpiece bed with a high and low structure. A workpiece indexing center frame with a function of supporting the workpiece and controlling the roller servo indexing function is arranged on the workpiece bed. The two sets of workpiece indexing center frame rollers of the workpiece indexing center frame are designed to have a driven first roller for radial alignment of the workpiece. Each first roller is controlled by a main indexing drive motor to drive a rotating shaft, and is used to set a pitch circle to achieve C-axis indexing of the workpiece. The present invention has a simple structure, can meet the requirements of centering, alignment, and precision indexing in one clamping, and can achieve the requirements of 96 deep hole processing accuracy on two circumferential indexing circles, thereby improving production efficiency. The present invention comprehensively uses the BTA method for deep hole processing, and has high processing efficiency, high precision, and low processing cost for circumferential holes, and can be widely used in products in industries such as nuclear spent fuel storage and transportation containers and chemical pressure vessels.

Description

Technical Field

[0001] The invention belongs to the field of processing equipment, in particular to a special deep hole drilling machine for high-frequency controlled deep hole processing of nuclear spent fuel storage and transportation containers. Background Art

[0002] Nuclear environmental safety is an important part of nuclear safety and a prerequisite for the sustainable and healthy development of the nuclear industry. Therefore, the requirements in the field of nuclear waste treatment technology are quite high. The development of nuclear spent fuel storage and transportation containers is a difficult problem in the field of nuclear safety and nuclear environmental protection. In the past, nuclear spent fuel storage and transportation containers could not be produced domestically and all relied on imports. Domestic companies have tried to use traditional equipment for processing, which requires large horizontal lathes, large milling and boring machines, large deep hole boring lathes, and large deep hole drilling machines. Multiple replacement and clamping processing, low efficiency, and difficult to ensure accuracy. For example, a spent fuel storage and transportation container has a large volume and requires high precision. Its diameter ranges from φ1500 to 3000mm and its net weight is greater than 150t. There is a circle of deep holes on the circumference of this storage and transportation container for installing sensors to monitor the temperature. The hole depth is 6000 mm and there are degree requirements (for example, the degree of one of the holes is 17°8′34″), so it is difficult to process these holes. The hole depth can be solved by a special deep hole drilling machine, but the position of the hole requires a higher precision indexing device to process. The general processing method is to set a C-axis indexing gear transmission shaft in the spindle box, but because the diameter of this storage and transportation container is relatively large, if the C-axis indexing is added in the spindle box, the structure inside the spindle box size will be huge and complicated, increasing processing costs and unnecessary waste. Summary of the invention

[0003] In view of the above problems, the purpose of the present invention is to provide a special deep hole drilling machine for C-axis deep hole processing of nuclear spent fuel storage and transportation containers. The workpiece indexing center frame is used to control the radial rotation of the workpiece to achieve C-axis indexing. The structure is simple, and the BTA (internal chip removal) method is used for deep hole processing. The processing efficiency and precision of the circular hole are high, and the processing cost is low.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A special deep hole drilling machine for deep hole multi-controlled deep hole processing of nuclear spent fuel storage and transportation containers, comprising a drill bed and a workpiece bed of high and low structures, the workpiece bed is provided with a workpiece indexing center frame feeding device and a workpiece supporting center frame, and the workpiece supporting center frame is close to the drill bed, the workpiece indexing center frame feeding device is provided with a workpiece holder and a workpiece indexing center frame, the workpiece holder is located on the side of the workpiece indexing center frame away from the drill bed, the workpiece holder and the workpiece indexing center frame can be moved in the Z direction under the drive of the workpiece indexing center frame feeding device; the workpiece indexing center frame comprises a workpiece indexing center frame base, a first motor reducer, a first double-headed screw, Two sets of workpiece indexing center frame rollers and two main indexing drive motors, the workpiece indexing center frame base is located on the workpiece bed and the workpiece indexing center frame feeding device, the first double-ended lead screw is horizontally arranged on the workpiece indexing center frame base, and the two sets of workpiece indexing center frame rollers are symmetrically arranged on the first double-ended lead screw, and the first motor reducer drives the first double-ended lead screw to rotate forward or reversely to make the two sets of workpiece indexing center frame rollers move synchronously in the opposite direction; the workpiece indexing center frame rollers include a first roller bracket, a rotating shaft and a first roller, the first roller bracket is located on the workpiece indexing center frame base and the first double-ended lead screw, the top of the first roller bracket is provided with a first roller, and the rotating shaft set The first roller is inside the first roller and is connected to the main indexing drive motor, and the main indexing drive motor drives the rotating shaft to drive the first roller to rotate together; the workpiece support center frame includes a workpiece support center frame base, a second motor reducer, a second double-ended lead screw and two sets of workpiece support center frame rollers, the workpiece support center frame base is fixed on the workpiece bed, the second double-ended lead screw is horizontally arranged on the workpiece support center frame base, and the two sets of workpiece support center frame rollers are symmetrically arranged on the second double-ended lead screw, and the second motor reducer drives the second double-ended lead screw to rotate forward or reversely to make the two sets of workpiece support center frame rollers move synchronously in the opposite direction; the workpiece is placed on the two sets of workpiece indexing center frame rollers and the two sets of workpiece The workpiece support center frame is on the roller, and the workpiece support is against the end of the workpiece away from the drill pipe bed; a drill pipe box, a drill pipe box feeding motor and a first guide rail arranged in the Z direction are arranged on the drill pipe bed, and the drill pipe box feeding motor drives the drill pipe box to move along the first guide rail; a guide center frame is arranged at one end of the drill pipe bed close to the workpiece bed, and an oiler is arranged on the guide center frame; a drill pipe box main motor is arranged on the drill pipe box, and the end of the drill pipe is inserted into the drill pipe box, and the drill pipe is driven to rotate by the drill pipe box main motor, and the front end of the drill pipe passes through a plurality of movable drill pipe supports on the first guide rail and then passes through the guide center frame to align with the workpiece; a chip conveyor and a coolant circulating water tank are arranged on one side of the drill pipe bed.

[0006] The workpiece indexing center frame feeding device comprises a second guide rail arranged on the workpiece bed in the Z direction, and a driving motor driving the workpiece support and the workpiece indexing center frame to move along the second guide rail.

[0007] The workpiece support is provided with a feedback circular grating for measuring the rotation angle of the workpiece.

[0008] An encoder for feedback compensation of the workpiece rotation angle is installed at the center of the workpiece.

[0009] The workpiece supporting center frame roller comprises a second roller bracket and a second roller. The second roller bracket is located on the workpiece supporting center frame base and the second double-headed lead screw. The second roller is arranged on the top of the second roller bracket.

[0010] A drill rod bed lifting mechanism for adjusting the height of the drill rod bed is provided at the bottom of the drill rod bed.

[0011] A drill rod support is arranged on the side of the guide center frame away from the workpiece bed, and a drill rod shock-absorbing sleeve is arranged on the drill rod support.

[0012] The maximum workpiece processing diameter R1 is 3000mm, and the minimum workpiece processing diameter R2 is 1500mm.

[0013] The present invention has the following beneficial effects: the special deep hole drilling machine for deep hole drilling of nuclear spent fuel storage and transportation container provided by the present invention adopts the workpiece indexing center frame to control the radial rotation of the workpiece, and uses the main indexing drive motor to drive the first roller to rotate to drive the workpiece to rotate, so as to realize the C-axis fine indexing of the workpiece; the spacing between the two first rollers and the spacing between the two second rollers are adjusted by the first motor reducer and the second motor reducer, so as to realize the adjustment of the position of the processing holes on different circumferences of the workpiece; compared with adding C-axis indexing in the spindle box, the present invention has a simple structure and low cost. Due to the large diameter of the workpiece, the depth of each hole in the processed hole system is deep, and the precision of the processed hole is high, it can meet the requirements of centering, alignment, and precise indexing in one clamping, and realize the processing precision requirements of 96 deep holes on two circumferential indexing circles, and the production efficiency is greatly improved. The present invention adopts a BTA deep hole drill bit and comprehensively utilizes the BTA (internal chip removal) method for deep hole processing. It has high processing efficiency, high precision and low processing cost for circular holes. It can be widely used in products in industries such as nuclear spent fuel storage and transportation containers, chemical pressure vessels, etc., and obtains good results.

[0014] Furthermore, the feedback circular grating and encoder provided in the present invention can measure and feedback the rotation angle of the workpiece, and can cooperate with the main indexing drive motor to further improve the indexing accuracy of the workpiece.

[0015] Furthermore, the present invention provides a drill bed lifting mechanism, which can adjust the height of the drill rod to align with the processing position of the circular holes of workpieces with different diameters. By adjusting the spacing between the two first rollers and the spacing between the two second rollers, it can be suitable for a larger span of workpiece diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0017] In the attached picture:

[0018] Figure 1 It is a schematic diagram of the overall structure of a special deep hole drilling machine for CNC deep hole processing of deep holes in nuclear spent fuel storage and transportation containers provided by the present invention;

[0019] Figure 2 yes Figure 1 A top view of

[0020] Figure 3 yes Figure 2 AA view in the figure;

[0021] Figure 4 yes Figure 3 BB section view in;

[0022] Figure 5 It is a schematic diagram of nuclear spent fuel storage and transportation containers;

[0023] In the figure: 1, workpiece support, 2, feedback circular grating, 3, drill pipe bed, 4, workpiece indexing center frame, 5, workpiece bed, 6, workpiece support center frame, 7, oiler, 8, guide center frame, 9, drill pipe support, 10, drill pipe shock-absorbing sleeve, 11, drill pipe, 12, movable drill pipe support, 13, first guide rail, 14, drill pipe box, 15, drill pipe box main motor, 16, drill pipe box feed motor, 17, iron chip conveyor, 18, coolant circulation water tank, 19, second Guide rail, 20, driving motor, 21, workpiece, 41, workpiece indexing center frame base, 42, workpiece indexing center frame roller, 43, main indexing drive motor, 44 first motor reducer, 45, first double-ended lead screw, 61, second motor reducer, 62, workpiece support center frame roller, 63, second double-ended lead screw, 421, first roller bracket, 422, rotating axis, 423, first roller, R1, maximum workpiece processing diameter, R2, minimum workpiece processing diameter. DETAILED DESCRIPTION

[0024] The above and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the embodiments with reference to the accompanying drawings. The structural contents mentioned in the following embodiments are all referenced to the accompanying drawings.

[0025] Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0026] See also Figure 1-4The special deep hole drilling machine for deep hole CNC deep hole processing of nuclear spent fuel storage and transportation containers provided by the present invention is a special machine tool for processing circumferential deep holes in manufacturing nuclear spent fuel storage and transportation containers. It adopts BTA deep hole drill bits and comprehensively uses BTA (internal chip removal) deep hole processing, which has high processing efficiency, high precision and low processing cost for circumferential holes.

[0027] The special deep hole drilling machine for deep hole CNC deep hole processing of nuclear spent fuel storage and transportation containers provided by the present invention consists of two parts: a workpiece bed 5 and a drill pipe bed 3, which are in a high-low structure (the workpiece bed 5 and the drill pipe bed 3 are respectively located at two horizontal planes of different heights, and the workpiece bed 5 is lower than the drill pipe bed 3). There are two sets of workpiece center frames (heavy-duty rollers) on the workpiece bed 5 to support the weight of the workpiece 21. One set of workpiece center frames is a workpiece indexing center frame 4, which has a function of controlling roller servo indexing in addition to supporting the workpiece. The two sets of workpiece indexing center frame rollers 42 of the workpiece indexing center frame 4 are designed to have a driven first roller 423, which is used for radial alignment of the workpiece 21. Each first roller 423 is controlled by a main indexing drive motor 43 to drive the rotating shaft, and is used to set the pitch circle to realize C-axis indexing of the workpiece 21. The other set of workpiece center frames is a workpiece support center frame 6, which only has the function of supporting the workpiece. The workpiece indexing center frame feeding device is installed on the left end face of the workpiece bed 5. The workpiece indexing center frame 4 can move longitudinally (Z direction). The distance between the workpiece indexing center frame 4 and the workpiece supporting center frame 6 can be adjusted according to the length of different workpieces, so as to best receive workpieces of different lengths, ensure that the right end of the workpiece is within a determined position range, and ensure the position accuracy of the entire workpiece and the bed. The drill bed 3 is installed on the right side of the workpiece bed 5. The drill bed 3 is provided with an oiler 7, a guide center frame 8, a drill rod support 9, a drill rod box 14 and a drill rod box feeding device (including a drill rod box feeding motor 16 and a second guide rail 19).

[0028] The directions in the present invention are defined as follows: the Z direction (longitudinal direction) is the direction of the main shaft axis of the drilling machine cutting force, that is, the length direction of the drill rod 11, and the transverse direction is the direction in the horizontal plane perpendicular to the Z direction.

[0029] Specifically, the special deep hole drilling machine for deep hole drilling of nuclear spent fuel storage and transportation container provided by the present invention comprises a drill bed 3 and a workpiece bed 5 of high and low structure. The workpiece bed 5 is provided with a workpiece indexing center frame feeding device and a workpiece supporting center frame 6, and the workpiece supporting center frame 6 is close to the drill bed 3 and fixed on the workpiece bed 5 without moving in the Z direction. The workpiece indexing center frame feeding device is provided with a workpiece holder 1 and a workpiece indexing center frame 4, the workpiece holder 1 is located on the side of the workpiece indexing center frame 4 away from the drill bed 3, and the workpiece supporting center frame 6 is located on the side of the workpiece indexing center frame 4 close to the drill bed 3, and the workpiece holder 1 and the workpiece indexing center frame 4 can move in the Z direction under the drive of the workpiece indexing center frame feeding device; the workpiece indexing center frame feeding device comprises a second guide rail 19 arranged on the workpiece bed 5 in the Z direction, and a driving motor 20 driving the workpiece holder 1 and the workpiece indexing center frame 4 to move along the second guide rail 19.The workpiece indexing center frame 4 includes a workpiece indexing center frame base 41, a first motor reducer 44, a first double-ended lead screw 45, two sets of workpiece indexing center frame rollers 42 and two main indexing drive motors 43. The workpiece indexing center frame base 41 is located on the workpiece bed 5 and the workpiece indexing center frame feeding device. A slider matching the second guide rail 19 is provided at the bottom of the workpiece indexing center frame base 41, which can move along the second guide rail 19 under the drive of the drive motor 20. For movement in the Z direction, the first double-ended lead screw 45 is horizontally arranged on the workpiece indexing center frame base 41, and the two sets of workpiece indexing center frame rollers 42 are symmetrically arranged on the first double-ended lead screw 45. The first motor reducer 44 drives the first double-ended lead screw 45 to rotate forward or reverse, so that the two sets of workpiece indexing center frame rollers 42 move synchronously in the opposite direction, and the distance between the two sets of workpiece indexing center frame rollers 42 is adjusted; the workpiece indexing center frame rollers 42 include a first roller bracket 421, a rotating shaft 422 and a first roller 423, the first roller bracket 421 is located on the workpiece indexing center frame base 41 and the first double-ended lead screw 45, a slider is provided at the bottom of the first roller bracket 421, which can move along the first double-ended lead screw 45 under the drive of the first motor reducer 44, a first roller 423 is provided on the top of the first roller bracket 421, the rotating shaft 422 is sleeved in the first roller 423 and is connected to the main indexing drive motor 43, the main indexing drive motor 43 The driving rotating shaft 422 drives the first roller 423 to rotate together; the workpiece support center frame 6 includes a workpiece support center frame base, a second motor reducer 61, a second double-ended lead screw 63 and two sets of workpiece support center frame rollers 62, the workpiece support center frame base is fixed on the workpiece bed 5, the second double-ended lead screw 63 is horizontally arranged on the workpiece support center frame base, and the two sets of workpiece support center frame rollers 62 are symmetrically arranged on the second double-ended lead screw 63, the second motor reducer 61 drives the second double-ended lead screw 63 to rotate forward or reverse so that the two sets of workpiece support center frame rollers 62 move synchronously in the opposite direction; the workpiece support center frame rollers 62 include a second roller bracket and a second roller, the second roller bracket is located on the workpiece support center frame base and the second double-ended lead screw 63, a slider is provided at the bottom of the second roller bracket, which can move along the second double-ended lead screw 63 driven by the second motor reducer 61, and a second roller is provided on the top of the second roller bracket. The workpiece 21 is placed on the first roller 423 of two sets of workpiece indexing center frame rollers 42 and the second roller 62 of two sets of workpiece support center frame rollers. The workpiece support 1 is against the end of the workpiece 21 away from the drill bed 3 to ensure that the workpiece does not move in the Z direction during the drilling process. A feedback circular grating 2 for measuring the rotation angle of the workpiece is provided on the workpiece support 1. An encoder for feedback compensation of the workpiece rotation angle is installed at the center of the workpiece 21, which realizes closed-loop control with the main indexing drive motor 43, thereby realizing precise indexing of the workpiece.

[0030] The drill bed 3 is provided with a drill box 14, a drill box feed motor 16 and a first guide rail 13 arranged in the Z direction. A feed carriage matching the first guide rail 13 is provided below the drill box 14. The drill box feed motor 16 drives the drill box 14 to move along the first guide rail 13 to realize numerical control of drilling depth. A guide center frame 8 and a drill rod support 9 are provided at one end of the drill bed 3 close to the workpiece bed 5. The drill rod support 9 is located on the right side of the guide center frame 8, and the first guide rail 13 is located on the right side of the drill rod support 9. A plurality of movable drill rod supports 12 are arranged on the first guide rail 13, an oiler 7 is arranged on the guide center frame 8, and a drill rod shock-absorbing sleeve 10 is arranged on the drill rod support 9 and the movable drill rod support 12 to support the drill rod; the drill rod box 14 is provided with a drill rod box main motor 15, the end of the drill rod 11 is inserted into the main shaft of the drill rod box 14, and the drill rod 11 is driven to rotate by the drill rod box main motor 15, and the front end of the drill rod 11 passes through the movable drill rod support 12, the drill rod support 9 and the guide center frame 8 in turn and then aligns with the workpiece 21. A drill rod bed lifting mechanism for adjusting the height is arranged at the bottom of the drill rod bed 3. The iron chip conveyor 17 is installed on the inner side of the drill rod bed 3, and the coolant circulating water is precipitated and filtered through the coolant circulating water tank 18 for recycling.

[0031] from Figure 2 From the top view, the extended line of the line connecting the midpoint of the two first rollers 423 (the center of the first double-ended lead screw 45) and the midpoint of the line connecting the two second rollers (the center of the second double-ended lead screw 63) coincides with the axis of the drill rod 11. The two first rollers 423 have the same height as the two second rollers, and from the top view, the two first rollers 423 and the two second rollers always form a rectangular or square shape, the position of the workpiece indexing center frame 4 changes the length of the rectangle or square, the first motor reducer 44 and the second motor reducer 61 always move synchronously, changing the width of the rectangle or square to adapt to workpieces of different diameters and adjusting different pitch circle positions of the same workpiece. The maximum workpiece processing diameter R1 of the special deep hole drilling machine for deep hole CNC deep hole processing of nuclear spent fuel storage and transportation containers of the present invention is 3000mm, and the minimum workpiece processing diameter R2 is 1500mm. The two main indexing drive motors 43 always maintain synchronous movement. The main indexing drive motor 43 is used to drive the rotating shaft 422 to rotate, and the first roller 423 is driven to rotate through the rotating shaft 422. The first roller 423 and the workpiece 21 achieve workpiece rotation through rolling friction. An encoder is installed at the center of the workpiece for feedback compensation of the rotation angle, and closed-loop control is achieved with the main indexing drive motor 43, thereby achieving precise indexing of the workpiece.

[0032] Working order: 1. According to the length of the workpiece, use the drive motor 20 to adjust the position of the workpiece indexing center frame 4; place the workpiece on the workpiece indexing center frame 4 and the workpiece support center frame 6, and according to the size of the workpiece diameter, use the first motor reducer 44 and the second motor reducer 61 to adjust the spacing between the two first rollers 423 and the spacing between the two second rollers until the circular hole to be processed on the workpiece is aligned with the center of the drill box spindle. 2. Drill the first hole on the same circle. 3. The main indexing drive motor 43 drives the rotating shaft 422 to drive the first roller 423 to rotate, and the first roller 423 drives the workpiece to roll. The workpiece drives the second roller to rotate during the rolling process. The main indexing drive motor 43, the feedback circular grating 2 and the encoder on the workpiece realize the precise indexing of the workpiece, and drill other holes on the same circle in turn. 4. Use the first motor reducer 44 and the second motor reducer 61 to adjust the distance between the two first rollers 423 and the distance between the two second rollers, or use the drill bed lifting mechanism to adjust the height of the drill bed until the center of the hole to be processed on the other circumference of the workpiece is aligned with the center of the drill rod. 5. Drill the first hole on the circumference. 6. After precise indexing, drill the other holes on the same circumference in sequence.

[0033] The invention has the following advantages: due to the large diameter of the workpiece, the depth of each hole in the processed hole system is deep, the precision of the processed holes is high, and the centering, alignment and precision indexing can be completed in one clamping, and the requirements of the processing precision of 96 deep holes on two circumferential indexing circles are achieved, and the production efficiency is greatly improved. It can be widely used in products in the industries such as nuclear spent fuel storage and transportation containers, chemical pressure vessels, etc., and obtain good effects.

[0034] The above is only one form of the structural layout and processing process of the special deep hole drilling machine for deep hole coefficient controlled deep hole processing of nuclear spent fuel storage and transportation containers of the present invention. In practical applications, according to workpieces with different diameters, it can be achieved by adjusting the workpiece indexing center frame 4 and the workpiece supporting center frame 6, which can expand the range of machinable workpieces, improve the efficiency of the machine tool, and achieve the full sequence processing accuracy requirement of drilling deep hole systems in one clamping.

[0035] The above is a further detailed description of the present invention in combination with a specific implementation method, and it cannot be determined that the specific implementation of the present invention is limited to this; for technical personnel in the technical field to which the present invention belongs and related technical fields, based on the technical solution of the present invention, the expansion and replacement of operating methods and data should all fall within the protection scope of the present invention.

Claims

1. A special deep hole drilling machine for deep hole CNC deep hole processing of nuclear spent fuel storage and transportation containers, characterized in that: The invention comprises a drill bed (3) and a workpiece bed (5) of a high-low structure, wherein the workpiece bed (5) is provided with a workpiece indexing center frame feeding device and a workpiece supporting center frame (6), and the workpiece supporting center frame (6) is close to the drill bed (3), and the workpiece indexing center frame feeding device is provided with a workpiece support (1) and a workpiece indexing center frame (4), and the workpiece support (1) is located on a side of the workpiece indexing center frame (4) away from the drill bed (3), and the workpiece support (1) and the workpiece indexing center frame (4) can be moved in the Z direction under the drive of the workpiece indexing center frame feeding device; the workpiece indexing center frame (4) The invention comprises a workpiece indexing center frame base (41), a first motor reducer (44), a first double-ended lead screw (45), two sets of workpiece indexing center frame rollers (42) and two main indexing drive motors (43), wherein the workpiece indexing center frame base (41) is located on a workpiece bed (5) and a workpiece indexing center frame feeding device, the first double-ended lead screw (45) is transversely arranged on the workpiece indexing center frame base (41), the two sets of workpiece indexing center frame rollers (42) are symmetrically arranged on the first double-ended lead screw (45), and the first motor reducer (44) drives the first double-ended lead screw (45) to rotate forward or reversely so that the two sets of workpiece indexing center frame rollers are rotated in the same direction. The workpiece indexing center frame roller (42) moves synchronously in the opposite direction; the workpiece indexing center frame roller (42) comprises a first roller bracket (421), a rotating shaft (422) and a first roller (423); the first roller bracket (421) is located on the workpiece indexing center frame base (41) and the first double-ended lead screw (45); a first roller (423) is provided on the top of the first roller bracket (421); the rotating shaft (422) is sleeved in the first roller (423) and is connected to the main indexing drive motor (43); the main indexing drive motor (43) drives the rotating shaft (422) to drive the first roller (423) ) rotate together; the workpiece support center frame (6) comprises a workpiece support center frame base, a second motor reducer (61), a second double-ended lead screw (63) and two sets of workpiece support center frame rollers (62); the workpiece support center frame base is fixed on the workpiece bed (5); the second double-ended lead screw (63) is transversely arranged on the workpiece support center frame base; the two sets of workpiece support center frame rollers (62) are symmetrically arranged on the second double-ended lead screw (63); the second motor reducer (61) drives the second double-ended lead screw (63) to rotate forward or reversely so that the two sets of workpiece support center frame rollers (62) move synchronously in the opposite direction; A workpiece (21) is placed on two sets of workpiece indexing center frame rollers (42) and two sets of workpiece supporting center frame rollers (62), and a workpiece support (1) is pressed against one end of the workpiece (21) away from a drill bed (3); a drill box (14), a drill box feeding motor (16) and a first guide rail (13) arranged in the Z direction are provided on the drill bed (3), and the drill box feeding motor (16) drives the drill box (14) to move along the first guide rail (13); a guide center frame (8) is provided at one end of the drill bed (3) close to the workpiece bed (5), and an oiler (7) is provided on the guide center frame (8); a drill box main motor (15) is provided on the drill box (14), and the end of the drill rod (11) is inserted into the drill box (14), and the drill box main motor (15) is driven to rotate the drill rod (11) along the first guide rail (13). 15) drives the drill rod (11) to rotate, and the front end of the drill rod (11) passes through a plurality of movable drill rod supports (12) on the first guide rail (13) and then passes through the guide center frame (8) to align with the workpiece (21); a chip conveyor (17) and a coolant circulation water tank (18) are provided on one side of the drill rod bed (3); the workpiece indexing center frame feeding device includes a second guide rail (19) arranged on the workpiece bed (5) in the Z direction, and a drive motor (20) driving the workpiece support (1) and the workpiece indexing center frame (4) to move along the second guide rail (19); a feedback circular grating (2) for measuring the rotation angle of the workpiece is provided on the workpiece support (1); and an encoder for feedback compensation of the rotation angle of the workpiece is installed at the center of the workpiece (21).

2. The special deep hole drilling machine for deep hole CNC deep hole processing of nuclear spent fuel storage and transportation containers according to claim 1 is characterized by: The workpiece support center frame roller (62) comprises a second roller support and a second roller, the second roller support is located on the workpiece support center frame base and the second double-ended lead screw (63), and the second roller is provided on the top of the second roller support.

3. The special deep hole drilling machine for deep hole CNC deep hole processing of nuclear spent fuel storage and transportation containers according to claim 1 is characterized by: A drill rod bed lifting mechanism for adjusting the height of the drill rod bed (3) is provided at the bottom thereof.

4. The special deep hole drilling machine for deep hole CNC deep hole processing of nuclear spent fuel storage and transportation containers according to claim 1 is characterized by: A drill rod support (9) is provided on the side of the guide center frame (8) away from the workpiece bed (5), and a drill rod shock-absorbing sleeve (10) is provided on the drill rod support (9).

5. The special deep hole drilling machine for deep hole CNC deep hole processing of nuclear spent fuel storage and transportation containers according to claim 1, characterized in that: The maximum workpiece processing diameter R1 is 3000mm, and the minimum workpiece processing diameter R2 is 1500mm.

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