Inner and outer cover compatible mechanism of spent fuel transport container bolt automatic loading and unloading machine

Abstract

The utility model relates to the field of spent fuel transport container bolt automatic loading and unloading machines, in particular to an inner cover and outer cover compatible mechanism of a spent fuel transport container bolt automatic loading and unloading machine, which comprises a positioning base used for being connected with a transport container bolt, and a screwing mechanism used for screwing the bolt is arranged on the positioning base. The tightening mechanism comprises a tightening shaft assembly, a supporting arm frame and a position changing mechanism, the position changing mechanism is installed on the supporting arm frame, a linear guide rail is arranged on the supporting arm frame, a linear guide groove matched with the linear guide rail is formed in the tightening shaft assembly, and the position changing mechanism drives the tightening shaft assembly. And the tightening shaft assembly slides along the linear guide rail along with the linear guide groove. According to the inner cover and outer cover compatible mechanism, the positioning function of the inner cover and the outer cover and the bolt dismounting function can be completed through one set of equipment, the adaptability of an automatic loading and unloading machine is improved, cost is saved, the bolt tightening precision of the inner cover and the outer cover is guaranteed, and production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of an automatic bolt loading and unloading machine for a spent fuel transport container, and more specifically, to an inner and outer cover compatible mechanism of an automatic bolt loading and unloading machine for a spent fuel transport container. Background Art

[0002] At present, the uranium company uses NAC-STC container to transport spent fuel, which is a stainless steel lead screen container weighing 114 tons. The container consists of a body, a hanging basket, an inner cover, an outer cover, etc. The inner and outer covers of the container are connected to the upper forgings with bolts respectively. Since the bolt distribution circle sizes of the inner and outer covers are quite different, the usual way is to use two different sets of equipment to solve the problem of tightening the inner and outer cover bolts respectively, and each set of equipment is adapted to the tightening requirements of the inner and outer cover bolts. This approach is too costly. In addition, due to the particularity of the spent fuel container cover and cover removal process, the inner and outer cover equipment are generally used at the same time and are often transported to different sites together with the container for use. Therefore, if two sets of equipment are used for the inner and outer covers, although it is feasible, it will bring many inconveniences to actual use. Summary of the invention

[0003] In view of the defects of the prior art mentioned above, the utility model aims to solve the compatibility problem of the inner and outer covers of the automatic bolt loading and unloading machine for spent fuel transport containers, so as to achieve the purpose of using one device as two devices.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: an inner and outer cover compatible mechanism of an automatic loading and unloading machine for bolts of a spent fuel transport container, comprising a positioning base for connecting the transport container bolts, the positioning base is provided with a tightening mechanism for tightening the bolts, the tightening mechanism comprises a tightening shaft assembly, a support arm and a displacement mechanism, the displacement mechanism is installed on the support arm, a linear guide rail is provided on the support arm, a linear guide groove matching the linear guide rail is provided on the tightening shaft assembly, and the displacement mechanism drives the tightening shaft assembly so that the tightening shaft assembly slides along the linear guide rail along the linear guide groove.

[0005] Furthermore, the displacement mechanism includes two sets of screw support seats, a screw, a nut and a handwheel; the two sets of the screw support seats are fixed on the support arm, a screw is rotatably connected between the two sets of the screw support seats, the handwheel is connected to the screw and drives the screw to rotate, a nut is threadedly connected to the screw, the nut is fixed to the tightening shaft assembly and drives the tightening shaft assembly to slide along the linear guide rail. The screw, nut and handwheel together constitute the drive for the tightening shaft assembly to slide.

[0006] Furthermore, the support arm is provided with a scale marking showing the position of the tightening shaft assembly, and the support arm is also provided with an external positioning hole and an internal positioning hole. A positioning pin for positioning the tightening shaft assembly is provided in the external positioning hole or the internal positioning hole. The external positioning hole corresponds to the positioning of the tightening shaft assembly when it acts on the outer cover bolt, and the internal positioning hole corresponds to the positioning of the tightening shaft assembly when it acts on the inner cover bolt.

[0007] Furthermore, both the outer positioning hole and the inner positioning hole are arranged on the support arm, and a positioning hole is arranged on the tightening shaft assembly. After the positioning hole on the tightening shaft assembly is aligned with the outer positioning hole or the inner positioning hole on the support arm, positioning is performed by a positioning pin.

[0008] Furthermore, there are three tightening shaft assemblies, which are distributed at intervals of 120°. The three tightening shaft assemblies are distributed on a pitch circle of equal diameter, and each tightening shaft assembly changes radial distance along the linear guide rail through a corresponding displacement mechanism.

[0009] Furthermore, the support arm includes three cantilever frames corresponding to the tightening shaft assembly, and the three cantilever frames are integrated into one body at one end away from the tightening shaft assembly to form a connection assembly of the support arm. The connection assembly of the support arm is connected to the positioning base through a lifting mechanism, and the lifting mechanism drives the support arm and the tightening shaft assembly to rise and fall. An automatic indexing and rotating mechanism is arranged on the connection assembly of the support arm, and the automatic indexing and rotating mechanism drives the support arm to rotate in a centering manner, thereby controlling the circumferential positions of the three tightening shaft assemblies to correspond to the bolts.

[0010] Furthermore, the tightening shaft assembly includes a mounting frame, a motor group, a tightening sleeve and two reaction sleeves. The motor group is fixed on the mounting frame, and the output end of the motor group is connected to the tightening sleeve. The two reaction sleeves are respectively arranged on both sides of the tightening sleeve. The linear guide groove is arranged on the mounting frame, and the mounting frame is slidably connected to the support arm frame, driving the motor group, the tightening sleeve and the two reaction sleeves to move synchronously.

[0011] Furthermore, a circular assembly cavity is provided at the center of the mounting frame, an upper support and a lower support are installed in the assembly cavity, a connecting hole is provided on the mounting frame, and connecting pins assembled with the connecting holes are respectively provided on the upper support and the lower support, and the connecting pins are fixed to the mounting frame through a connecting assembly; corresponding axial holes are provided on the upper support and the lower support, the motor group is fixedly connected to the upper support, the output shaft of the motor group passes through the axial hole to connect the tightening sleeve, and the two reaction sleeves are connected to the lower support; the tightening sleeve and the two reaction sleeves are arranged in an arc shape, and the arc is adapted to the arc of the inner cover bolt.

[0012] Furthermore, the mounting frame, upper support and lower support are respectively formed with pin sleeves on the same side, and pin shaft holes are formed in the pin sleeves. The pin shaft holes on the mounting frame, upper support and lower support are connected and equipped with pluggable pins; when the tightening sleeve acts on the inner cover to tighten, the pin is pulled out, the mounting frame, upper support and lower support are separated, and the reaction sleeve acts. When the tightening sleeve acts on the outer cover to tighten, the pin is inserted, the mounting frame, upper support and lower support are connected as a whole through the pin, and the reaction sleeve does not work.

[0013] Furthermore, the positioning base is arranged above the inner cover or the outer cover, and a positioning block is retractably arranged on the positioning base and positioned by the inner cover limit pin or the outer cover limit pin, and the positioning block is connected to the positioning base by bolts and supported by top screws.

[0014] Furthermore, the positioning base is a rectangular structure, and a supporting foot is suspended at each of the four corners of the positioning base, and a positioning block is connected below the supporting foot. The supporting foot is provided with an inner cover limit pin hole and an outer cover limit pin hole for fixing the position of the positioning block, and the positioning block is also provided with an inner cover limit pin hole and an outer cover limit pin hole corresponding to the supporting foot. The inner cover limit pin hole of the supporting foot and the inner cover limit pin hole of the positioning block are positioned by the inner cover limit pin, and the outer cover limit pin hole of the supporting foot and the outer cover limit pin hole of the positioning block are positioned by the outer cover limit pin. The inner cover limit pin is positioned, and the outer surface of the inner cover limit pin and the outer surface of the outer cover limit pin are different in shape, and the two cannot be used interchangeably; the end of the positioning block is provided with a connecting hole matching the inner / outer cover lifting hole, the positioning block moves inward and retracts, the inner cover limit pin is assembled in the inner cover limit pin hole of the supporting foot and the positioning block, the connecting hole of the positioning block is connected and fixed to the inner cover lifting hole, the positioning block moves outward and extends, the outer cover limit pin is assembled in the outer cover limit pin hole of the supporting foot and the positioning block, and the connecting hole of the positioning block is connected and fixed to the outer cover lifting hole.

[0015] The beneficial effects of the utility model are as follows: the inner and outer cover compatible mechanism of the automatic loading and unloading machine for bolts of spent fuel transport containers of the utility model can complete the positioning function and the bolt disassembly function of the inner and outer covers through a set of equipment, thereby improving the adaptability of the automatic loading and unloading machine, saving costs, ensuring the tightening accuracy of the inner and outer cover bolts, and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the inner cover;

[0017] Figure 2 is a schematic diagram of the outer cover;

[0018] Figure 3 It is a schematic diagram of the connection between the positioning base and the inner cover;

[0019] Figure 4 It is a schematic diagram of the connection between the positioning base and the outer cover;

[0020] Figure 5 This is an enlarged view of the connection between the positioning block and the supporting foot;

[0021] Figure 6 To locate the axonometric drawing of the base;

[0022] Figure 7 for Figure 6 A magnified view of the assembly position of the middle limit pin;

[0023] Figure 8 It is a three-dimensional schematic diagram of the tightening mechanism;

[0024] Fig. 9 for Figure 8 A first angle view of the tightening mechanism;

[0025] Fig.10 for Figure 8 A second angle view of the tightening mechanism;

[0026] Fig.11 It is a schematic diagram of the connection of a single tightening shaft assembly;

[0027] Fig.12 It is a schematic diagram of the positions of the outer positioning holes and the inner positioning holes in the displacement mechanism;

[0028] Fig.13 This is an enlarged view of the displacement mechanism;

[0029] Fig.14 It is a schematic diagram of the structure of the tightening shaft assembly;

[0030] Fig.15 for Fig.14 A first cross-sectional view of the tightening shaft assembly structure;

[0031] Fig.16 for Fig.14 A second cross-sectional view of the tightening shaft assembly structure;

[0032] Fig.17 It is an enlarged cross-sectional view of the connection structure of the mounting frame;

[0033] Fig.18 This is the general assembly drawing of the automatic loading and unloading machine for spent fuel transport container bolts;

[0034] In the figure: 1, inner cover, 2, inner cover lifting hole, 3, inner cover bolt, 4, outer cover, 5, outer cover lifting hole, 6, outer cover bolt, 7, positioning base, 8, positioning block, 9, support foot, 10, connecting bolt, 11, inner cover limit pin hole, 12, outer cover limit pin hole;

[0035] A. Support arm;

[0036] B, displacement mechanism, B0, screw support seat, B1, screw mechanism, B2, guide mechanism, B21, linear guide rail, B22, linear guide groove, B3, nut, B4, hand wheel, B5, external positioning hole, B6, internal positioning hole, B7, positioning pin;

[0037] C, tightening shaft assembly, C0, mounting frame, C1, motor assembly, C2, tightening sleeve, C3, reaction sleeve, C4, upper support, C5, lower support, C6, connecting hole, C7, connecting pin, C8, connecting assembly, C9, pin sleeve, C10, latch;

[0038] D. Lifting mechanism;

[0039] E. Automatic indexing rotary mechanism. DETAILED DESCRIPTION

[0040] In order to make the structure and function of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0041] The number of bolts on the inner cover of the NAC-STC container is 42, the bolt distribution circle size is: 1912.9mm, and the target tightening torque value is 3443±271Nm; the number of bolts on the outer cover is 36, the bolt distribution circle size is 2126mm, and the target tightening torque value is 746±68Nm. In addition, the locating hole distribution of the inner and outer covers is also different. Since the target torque, bolt distribution, and locating hole size of tightening are quite different, the usual way is to use two different sets of bolt tightening equipment to solve the problem of tightening the inner and outer cover bolts respectively.

[0042] The utility model aims to solve the compatibility problem of inner and outer covers of the automatic bolt loading and unloading machine for spent fuel transport containers, and realize the purpose of using one device as two devices.

[0043] In order to solve the compatibility problem of the inner and outer covers of the automatic loading and unloading machine for spent fuel transport container bolts, the utility model solves the compatibility problem from the following four aspects

[0044] 1) Solve the compatibility problem between the assembly and disassembly machine and the connection and positioning mechanism of the inner and outer covers of the container;

[0045] 2) Solve the compatibility problem between the distribution size of the three tightening axes on the assembly and disassembly machine and the distribution of the inner and outer cover bolts;

[0046] 3) Solve the compatibility problem of the reaction force when tightening the inner and outer cover bolts;

[0047] 4) Solve the compatibility issues of inner and outer covers in the tightening process control, including the number of bolts, tightening torque, tightening sequence, etc. The following are explained separately.

[0048] First, the compatibility problem between the assembly and disassembly machine and the connection and positioning mechanism between the inner and outer covers of the container should be solved.

[0049] See attached Figure 1-7 The inner and outer cover compatible mechanism of the automatic loading and unloading machine for bolts of spent fuel transport container includes a positioning base 7 for connecting the transport container bolts, the positioning base 7 is provided with a tightening mechanism for tightening the bolts, the positioning base 7 is arranged above the inner cover 1 or the outer cover 4, the positioning base 7 is provided with a positioning block 8 which is retractable and positioned by the inner cover limit pin or the outer cover limit pin, the positioning block is connected to the positioning base by bolts and supported by top screws. The positioning base 7 is a rectangular structure, and a supporting foot 9 is suspended at each of the four corners of the positioning base, the positioning block 8 is connected below the supporting foot 9, the supporting foot 9 is provided with an inner cover limit pin hole 11 and an outer cover limit pin hole 12 for fixing the position of the positioning block 8, the positioning block 8 is also provided with an inner cover limit pin hole 11 and an outer cover limit pin hole 12 corresponding to the supporting foot, the inner cover limit pin hole of the supporting foot and the inner cover limit pin hole of the positioning block are positioned by the inner cover limit pin, the outer cover limit pin hole of the supporting foot and the outer cover limit pin hole of the positioning block are positioned by the outer cover limit pin, The outer surface of the inner cover limit pin and the positioning outer surface of the outer cover limit pin are different in shape and the two cannot be used interchangeably; the end of the positioning block 8 is provided with a connecting hole matching the inner / outer cover lifting hole, the positioning block 8 moves inward and retracts, the inner cover limit pin is assembled in the inner cover limit pin hole of the supporting foot and the positioning block, and the connecting hole of the positioning block is connected and fixed with the inner cover lifting hole 2 by the connecting bolt 10; the positioning block moves outward and extends, the outer cover limit pin is assembled in the outer cover limit pin hole of the supporting foot and the positioning block, and the connecting hole of the positioning block is connected and fixed with the outer cover lifting hole 5 by the connecting bolt 10.

[0050] Based on the above technical solution, the inner cover limit pin and the outer cover limit pin are cylindrical pins and diamond pins respectively, which are used to realize the positioning of the support leg 8 and the base 7. The positioning block 8 and the support foot 9 also need to be connected stably with bolts. The shapes of the inner cover limit pin hole 11 and the outer cover limit pin hole 12 are also corresponding cylindrical pin holes and diamond pin holes. Only when the shapes of the limit pin holes on the positioning block 8 and the support foot 9 correspond, the limit pins can be connected to avoid the inability to observe the positions of the two pin holes of the positioning block 8, resulting in misconnection.

[0051] The base of the assembler has four supporting feet 9, each supporting foot 9 is a set of connection and positioning tools. When using the assembler, place the assembler on the lid of the spent fuel transport container, align the four connection and positioning tools with the four lifting holes on the inner cover, and then fix the two together through the connecting bolts 10. In this way, the assembler and the inner cover of the container are fixed together, and the rough positioning of the assembler is also achieved. The bolt distribution of the inner cover and the outer cover and the position of the positioning holes are shown in Figure 1-2As shown in the figure, the inner cover 1 has the lifting holes 2, the inner cover bolts 3 (42 in total), the outer cover 4 has the lifting holes 5, and the outer cover bolts 6 (36 in total).

[0052] Since the sizes of the lifting holes of the inner cover and the outer cover are different, the inner cover is φ1779mm and the outer cover is φ1930.4mm, we designed an adjustable positioning fixture to make them compatible. Figure 3-6 , including a positioning base 7, a positioning block 8 and a supporting foot 9. When the inner cover 1 is in use, the positioning block 8 is retracted inward, and the inner cover limit pin is inserted into the inner cover limit pin hole of the supporting foot and the positioning block. At this time, the tooling is in a retracted state, and the size of the connecting hole of the tooling is consistent with the size of the lifting hole of the inner cover; when the outer cover 4 is in use, the positioning block 8 is moved outward and extended. After adjusting the tooling to the extended position, the outer cover limit pin is inserted into the outer cover limit pin hole of the supporting foot and the positioning block, which can meet the positioning requirements of the outer cover.

[0053] Based on the above technical solution, in order to facilitate adjustment, a limit groove for limiting the movement of the positioning block 8 can be set in the supporting foot 9. When the positioning block 8 moves to the extreme positions at both ends, the connecting holes of the positioning block 8 correspond to the inner cover lifting hole 2 and the outer cover lifting hole 5 respectively.

[0054] Secondly, the compatibility problem of the inner and outer cover bolt distribution of the three tightening axis distribution sizes on the assembly and disassembly machine is solved.

[0055] The number of bolts on the inner cover is 42, and the bolt distribution circle size is: 1912.9mm, while the number of bolts on the outer cover is 36, and the bolt distribution circle size is 2126mm. To solve this problem, we designed the following Figure 8 The tightening axis distribution adjustment mechanism (also called tightening axis distribution displacement mechanism) realizes the goal of adjusting the distribution circle sizes of the three tightening axes.

[0056] See attached Figure 8-18The inner and outer cover compatible mechanism of the automatic loading and unloading machine for bolts of spent fuel transport container comprises a positioning base 7 for connecting the transport container bolts, the positioning base 7 is provided with a tightening mechanism for tightening the bolts, the tightening mechanism comprises a tightening shaft assembly C, a support arm A and a displacement mechanism B, the displacement mechanism B is installed on the support arm A, the displacement mechanism B comprises two sets of lead screw support seats B0, a lead screw B1, a nut B3, a guide mechanism B2 and a hand wheel B4; the guide mechanism B2 comprises a linear guide rail B21 and a linear guide groove B22, the linear guide rail B21 is arranged on the support arm A, and the guide rail B21 is arranged on the support arm A. On the arm A, the tightening shaft assembly is provided with a linear guide groove B22 matching the linear guide rail B21, and the displacement mechanism B drives the tightening shaft assembly C so that the tightening shaft assembly C slides along the linear guide groove B22 along the linear guide rail B21; the two sets of the screw support seats B0 are fixed on the support arm A, and the two sets of the screw support seats B0 are rotatably connected with a screw B1, the handwheel B4 is connected to the screw B1 and drives the screw B1 to rotate, and a nut B3 is threadedly connected to the screw B1, and the nut B3 is fixed to the tightening shaft assembly C and drives the tightening shaft assembly C to slide along the linear guide rail B21.

[0057] Furthermore, the support arm A is provided with a scale marking showing the position of the tightening shaft assembly, and the support arm A is also provided with an external positioning hole B5 and an internal positioning hole B6. A positioning pin B7 for positioning the tightening shaft assembly is provided in the external positioning hole B5 or the internal positioning hole B6. The external positioning hole B5 corresponds to the positioning of the tightening shaft assembly when it acts on the outer cover bolt, and the internal positioning hole B6 corresponds to the positioning of the tightening shaft assembly when it acts on the inner cover bolt.

[0058] Furthermore, the outer positioning hole B5 and the inner positioning hole B6 are both arranged on the support arm A, and a positioning hole is arranged on the tightening shaft assembly C. After the positioning hole on the tightening shaft assembly C is aligned with the outer positioning hole B5 or the inner positioning hole B6 on the support arm A, positioning is performed by the positioning pin B7.

[0059] Furthermore, there are three tightening shaft assemblies C, which are distributed at intervals of 120°. The three tightening shaft assemblies C are distributed on a pitch circle of equal diameter, and each tightening shaft assembly C changes radially along the linear guide B21 through the corresponding displacement mechanism B.

[0060] Furthermore, the support arm A includes three cantilever frames corresponding to the tightening shaft assembly C. The three cantilever frames are integrated into one body at one end away from the tightening shaft assembly to form a connection assembly of the support arm. The connection assembly of the support arm is connected to the positioning base 7 through a lifting mechanism. The lifting mechanism drives the support arm A and the tightening shaft assembly C to rise and fall. An automatic indexing and rotating mechanism is arranged on the connection assembly of the support arm A. The automatic indexing and rotating mechanism drives the support arm to rotate in a centering manner, and controls the circumferential positions of the three tightening shaft assemblies C to correspond to the bolts.

[0061] It should be noted that the lifting mechanism and the automatic indexing rotary mechanism recorded in this embodiment are components of the tightening shaft assembly to realize the tightening function of all bolts. The lifting mechanism can make the tightening shaft assembly close to or away from the inner and outer cover bolts, and the automatic indexing rotary mechanism can make the tightening shaft assembly rotate as a whole, so that the three tightening shafts act on all the inner and outer cover bolts to tighten or loosen them during multiple indexing rotations. Therefore, the lifting mechanism and the automatic indexing rotary mechanism are necessary components of the automatic loading and unloading machine for spent fuel transport container bolts, but are not necessary components of the inner and outer cover compatible mechanism of this application. Therefore, this application does not limit the specific structure of the lifting mechanism and the automatic indexing rotary mechanism. The lifting mechanism and the automatic indexing rotary mechanism can adopt structures that can realize the corresponding functions in common knowledge, and the lifting mechanism and the automatic indexing rotary mechanism can also be controlled by a computer.

[0062] Based on the above technical solution, a frame for assembling the tightening shaft assembly C is formed at the bottom of the support arm A, and the linear guide rails B21 are arranged on opposite sides of the frame. The tightening shaft assembly C is slidably arranged in the linear guide rails B21 on both sides through the linear guide grooves B22 to ensure the stability of the entire tightening shaft assembly sliding process. The displacement mechanism B is arranged on one side of the frame, and the outer positioning hole B5 and the inner positioning hole B6 are arranged on the other side of the frame to facilitate the operation of the positioning pin B7.

[0063] The core of the tightening mechanism of the utility model is a 6000Nm tightening shaft. There are three sets of displacement mechanisms, one set for each tightening shaft, and the three sets are adjusted independently. Each set of adjustment mechanism includes: two sets of screw support seats B0, one set of screw mechanism B1, one set of guide rail mechanism B2, one set of nut B3, one set of handwheel mechanism B4, and latch mechanism B7; there are two positioning holes B5 and B6 on the positioning mechanism, of which the size of the inner positioning hole B6 corresponds to the inner cover, and the size of the outer positioning hole B5 corresponds to the outer cover.

[0064] When adjustment is required, first pull out the locating pin B7 located at the inner locating hole B6 or the outer locating hole B5, and then shake the handwheel B4 to change the distribution size of the tightening shaft (turn the handwheel clockwise to increase the distribution size; turn it counterclockwise to decrease the distribution size). There are scale marks on the adjustment mechanism. The scale marks mark the inner cover hole and the outer cover hole above the inner locating hole and the outer locating hole. You can observe them during adjustment. When the scale corresponds to the required position, insert the locating pin into the corresponding locating hole to complete the displacement adjustment of one axis. The adjustment method for other axes is the same. After adjusting the dimensions of the three axes in this way, the step of compatibility of the inner and outer covers is completed.

[0065] Then, solve the problem of compatibility of the reaction force when tightening the inner and outer cover bolts.

[0066] See attached Figure 14-17The tightening shaft assembly includes a mounting frame C0, a motor group C1, a tightening sleeve C2 and two reaction sleeves. The motor group C1 is fixed on the mounting frame C0, and the output end of the motor group C1 is connected to the tightening sleeve C2. The two reaction sleeves C3 are respectively arranged on both sides of the tightening sleeve C2. The linear guide groove B22 is arranged on the mounting frame C0. The mounting frame C0 is slidably connected to the support arm frame, driving the motor group C1, the tightening sleeve C2 and the two reaction sleeves C3 to move synchronously.

[0067] Furthermore, a circular assembly cavity is provided at the center of the mounting frame C0, and an upper support C4 and a lower support are installed in the assembly cavity. A connecting hole C6 is provided on the mounting frame C0, and connecting pins C7 assembled with the connecting hole C6 are respectively provided on the upper support C4 and the lower support C5, and the connecting pins C7 are fixed to the mounting frame C0 through a connecting assembly C8; corresponding axial holes are provided on the upper support C4 and the lower support C5, the motor group C1 is fixedly connected to the upper support C4, and the output shaft of the motor group C1 passes through the axial hole to connect the tightening sleeve C2, and the two reaction sleeves C3 are connected to the lower support C5; the tightening sleeve C2 and the two reaction sleeves C3 are arranged in an arc shape, and the arc is adapted to the arc of the inner cover bolt.

[0068] Furthermore, the mounting frame C0, the upper support C4 and the lower support C5 are respectively formed with pin sleeves C9 on the same side, and a pin shaft hole is formed in the pin sleeve C9. The pin shaft holes on the mounting frame C0, the upper support C4 and the lower support are connected and equipped with a pluggable pin C10; when the tightening sleeve C2 acts on the inner cover to tighten, the pin C10 is pulled out, the mounting frame C0, the upper support C4 and the lower support C5 are separated, and the reaction sleeve C3 acts. When the tightening sleeve C2 acts on the outer cover to tighten, the pin C10 is inserted, the mounting frame C0, the upper support C4 and the lower support C5 are connected as a whole through the pin C10, and the reaction sleeve C3 does not work.

[0069] In order to ensure the safety of tightening, the utility model is equipped with a reaction force overcoming mechanism on the inner cover tightening mechanism. Since the number and distribution size of bolts of the outer cover and the inner cover are different, the reaction force mechanism used for the inner cover cannot be applied to the outer cover. Considering that the tightening torque of the outer cover is small, we have adopted the method of strengthening the tightening support mechanism so that the tightening reaction force is directly borne by the tightening support mechanism. The switching method of the reaction force mechanism of the inner and outer covers is as follows:

[0070] When switching from tightening the inner cover to tightening the outer cover, first, the reaction mechanism selects the latch mechanism to switch: when tightening the inner cover, select the latch C10 to be pulled out; when tightening the outer cover, select the latch C10 to be plugged in; secondly, replace the tightening sleeve C2 with the sleeve used for the outer cover. When tightening / loosening the outer cover, the reaction sleeve C3 does not work and can be removed.

[0071] Based on the above technical solution, considering the large difference in tightening torque between the inner and outer covers, a special reaction sleeve C3 and a latch structure C10 are designed for use together. When tightening with a large torque, the latch C10 needs to be pulled out. In this way, due to the gap between the latch C10 and the pin sleeve C9 during tightening, the tightening shaft can swing slightly and freely during tightening, and the tightening reaction force will not act on the linear guide B21. Instead, the reaction sleeve C3 is sleeved on the bolt to overcome the tightening reaction force, thereby protecting the linear guide B21. When the pin torque is tightened, the linear guide can withstand a relatively small tightening reaction force. At this time, there is no need to pull out the latch C10.

[0072] Finally, solve the compatibility problem of inner and outer covers in the tightening process control, including the number of bolts, tightening torque, tightening sequence and other issues.

[0073] The automatic bolt loading and unloading machine for spent fuel transport container of the utility model is controlled by computer as a whole, so this only needs to be designed in the control program, and the "inner cover" / "outer cover" can be selected to be tightened on the HMI of the control system, and then the control system will automatically switch the control program to realize automatic control of tightening / loosening of the inner and outer covers.

[0074] The utility model "Inner and outer cover compatible mechanism of the automatic loading and unloading machine for spent fuel transport container bolts" solves the problem that the inner and outer covers of the automatic loading and unloading machine for spent fuel transport container bolts share one device. It improves the adaptability of the automatic loading and unloading machine, saves costs, ensures the tightening accuracy of the inner and outer cover bolts, and improves production efficiency.

[0075] Therefore, this patent can be applied wherever there is a similar demand.

[0076] It should be noted that the parts not described in detail in the present invention are prior art.

[0077] The above examples are only the best embodiments of the present invention. Obviously, the present invention is not limited to the above examples, and there are many variations. All variations that can be directly derived or associated with the contents disclosed by a person skilled in the art should be considered as the protection scope of the present invention.

Claims

1. An inner and outer cover compatible mechanism of an automatic bolt loading and unloading machine for a spent fuel transport container, characterized in that: It includes a positioning base for connecting the bolts of the transport container, the positioning base is provided with a tightening mechanism for tightening the bolts, the tightening mechanism includes a tightening shaft assembly, a support arm and a displacement mechanism, the displacement mechanism is installed on the support arm, a linear guide rail is provided on the support arm, a linear guide groove matching the linear guide rail is provided on the tightening shaft assembly, and the displacement mechanism drives the tightening shaft assembly so that the tightening shaft assembly slides along the linear guide rail along the linear guide groove.

2. The inner and outer cover compatible mechanism of the automatic bolt loading and unloading machine for spent fuel transport container according to claim 1, characterized in that: The displacement mechanism includes two sets of screw support seats, a screw, a nut and a handwheel; the two sets of the screw support seats are fixed on the support arm, and a screw is rotatably connected between the two sets of the screw support seats. The handwheel is connected to the screw and drives the screw to rotate. The screw is threadedly connected with a nut, and the nut is fixed to the tightening shaft assembly and drives the tightening shaft assembly to slide along the linear guide rail.

3. The inner and outer cover compatible mechanism of the automatic bolt loading and unloading machine for spent fuel transport container according to claim 1 is characterized in that: The support arm is also provided with an external positioning hole and an internal positioning hole. A positioning pin for positioning the tightening shaft assembly is provided in the external positioning hole or the internal positioning hole. The external positioning hole corresponds to the positioning of the tightening shaft assembly when it acts on the outer cover bolt, and the internal positioning hole corresponds to the positioning of the tightening shaft assembly when it acts on the inner cover bolt.

4. The inner and outer cover compatible mechanism of the automatic bolt loading and unloading machine for spent fuel transport container according to claim 1, characterized in that: There are three tightening shaft assemblies, which are distributed at intervals of 120°. The three tightening shaft assemblies are distributed on a pitch circle of equal diameter, and each tightening shaft assembly changes radial distance along the linear guide rail through a corresponding displacement mechanism.

5. The inner and outer cover compatible mechanism of the automatic bolt loading and unloading machine for spent fuel transport container according to claim 4, characterized in that: The support arm frame includes three cantilever frames corresponding to the tightening shaft assembly. The three cantilever frames are integrated into one body at one end away from the tightening shaft assembly to form a connecting assembly of the support arm frame. The connecting assembly of the support arm frame is connected to the positioning base through a lifting mechanism, and the lifting mechanism drives the support arm frame and the tightening shaft assembly to rise and fall.

6. The inner and outer cover compatible mechanism of the automatic bolt loading and unloading machine for spent fuel transport container according to claim 1, characterized in that: The tightening shaft assembly includes a mounting frame, a motor group, a tightening sleeve and two reaction sleeves. The motor group is fixed on the mounting frame, and the output end of the motor group is connected to the tightening sleeve. The two reaction sleeves are respectively arranged on both sides of the tightening sleeve. The linear guide groove is arranged on the mounting frame. The mounting frame is slidably connected to the support arm frame, driving the motor group, the tightening sleeve and the two reaction sleeves to move synchronously.

7. The inner and outer cover compatible mechanism of the automatic bolt loading and unloading machine for spent fuel transport container according to claim 6, characterized in that: A circular assembly cavity is provided at the center of the mounting frame, and an upper support and a lower support are installed in the assembly cavity. A connecting hole is provided on the mounting frame, and connecting pins assembled with the connecting holes are respectively provided on the upper support and the lower support, and the connecting pins are fixed to the mounting frame through a connecting assembly; corresponding axial holes are provided on the upper support and the lower support, and the motor group is fixedly connected to the upper support, and the output shaft of the motor group passes through the axial hole to connect the tightening sleeve, and the two reaction sleeves are connected to the lower support.

8. The inner and outer cover compatible mechanism of the automatic bolt loading and unloading machine for spent fuel transport container according to claim 7, characterized in that: The mounting frame, upper support and lower support are respectively formed with pin sleeves on the same side, and pin shaft holes are formed in the pin sleeves. The pin shaft holes on the mounting frame, upper support and lower support are connected and equipped with pluggable pins. When the tightening sleeve acts on the inner cover to tighten, the pin is pulled out, the mounting frame, upper support and lower support are separated, and the reaction sleeve acts. When the tightening sleeve acts on the outer cover to tighten, the pin is inserted, the mounting frame, upper support and lower support are connected as a whole through the pin, and the reaction sleeve does not work.

9. The inner and outer cover compatible mechanism of the automatic bolt loading and unloading machine for spent fuel transport container according to claim 1, characterized in that: The positioning base is arranged above the inner cover or the outer cover, and a positioning block is telescopically arranged on the positioning base and is positioned by the inner cover limit pin or the outer cover limit pin.

10. The inner and outer cover compatible mechanism of the automatic bolt loading and unloading machine for spent fuel transport container according to claim 1 or 9, characterized in that: The positioning base is a rectangular structure, and a supporting foot is suspended at each of the four corners of the positioning base. A positioning block is connected below the supporting foot. The supporting foot is provided with an inner cover limit pin hole and an outer cover limit pin hole for fixing the position of the positioning block. The positioning block is also provided with an inner cover limit pin hole and an outer cover limit pin hole corresponding to the supporting foot. The inner cover limit pin hole of the supporting foot and the inner cover limit pin hole of the positioning block are positioned by the inner cover limit pin, and the outer cover limit pin hole of the supporting foot and the outer cover limit pin hole of the positioning block are positioned by the outer cover limit pin The outer surface of the inner cover limit pin and the outer surface of the outer cover limit pin are different in shape and cannot be used interchangeably; the end of the positioning block is provided with a connecting hole matching the inner / outer cover lifting hole, the positioning block moves inward and retracts, the inner cover limit pin is assembled in the inner cover limit pin hole of the supporting foot and the positioning block, the connecting hole of the positioning block is connected and fixed to the inner cover lifting hole, the positioning block moves outward and extends, the outer cover limit pin is assembled in the outer cover limit pin hole of the supporting foot and the positioning block, and the connecting hole of the positioning block is connected and fixed to the outer cover lifting hole.

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