Stretching device

Abstract

The present invention relates to a stretching device for providing a tensioning force to a sealing fixture. The sealing fixture includes a first fixture and a second fixture disposed opposite to each other. The sealing fixture further includes a plurality of fasteners, each fastener passing through a first connection hole and connecting to a corresponding second connection hole to fasten the first fixture and the second fixture. The stretching device includes a stretching drive assembly and a stretching member. The stretching drive assembly can be supported on the first fixture. One end of the stretching member is detachably connected to the stretching drive assembly, and the other end can pass through the first connection hole and connect to the second connection hole. The stretching drive assembly is used to drive the stretching member to move, so as to generate a stretching force that causes the second fixture to move towards the first fixture. The stretching device provided in this application is easy to remotely stretch the sealing fixture, causing the sealing filler inside the second fixture to deform and fit tightly with the sealing weld, thereby achieving the sealing of the weld of the component to be sealed.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power plant maintenance, and particularly to a stretching device. Background Art

[0002] As one of the key equipment of a nuclear power plant, the control rod drive mechanism of a nuclear power unit is a servo mechanism of the reactor control system and the safety protection system of the nuclear power plant.

[0003] Generally, the control rod drive mechanism realizes the connection and sealing requirements between various components through sealed welds. When the sealed weld leaks due to quality problems or stress corrosion, it will threaten the safe and stable operation of the nuclear power plant. Therefore, when the weld leaks, a sealing fixture needs to be used to press the sealed weld tightly to block the leakage of the weld. When operating the sealing fixture, it is necessary to rely on the stretching load of the stretching device to deform the sealing material in the sealing fixture to fit and press tightly against the weld, so as to achieve sealing.

[0004] Currently, bolts are usually used to apply a pre-tightening force to the sealing fixture. However, when installing the sealing fixture in a narrow space, it is difficult for the staff to perform a close-range stretching operation, and the radiation dose received by the staff is high, resulting in difficulties in carrying out the work or low efficiency. Summary of the Invention

[0005] Based on this, in view of the problems that it is difficult for the staff to perform a close-range stretching operation on the sealing fixture, and the radiation dose received by the staff is high, resulting in difficulties in carrying out the work or low efficiency, it is necessary to provide a stretching device that can easily apply a stretching pre-tightening force to the sealing fixture remotely to improve work efficiency and reduce the radiation dose of the staff.

[0006] A stretching device is used to provide a tightening force to a sealing fixture. The sealing fixture includes a first fixture and a second fixture arranged oppositely. A clamping space is formed between the first fixture and the second fixture. The sealing fixture further includes a plurality of fasteners. The first fixture is provided with a plurality of first connection holes, and the second fixture is provided with a plurality of second connection holes. Each fastener passes through a first connection hole and is connected to a corresponding second connection hole to fasten the first fixture and the second fixture. The stretching device includes:

[0007] A stretching drive assembly capable of being supported on the first fixture;

[0008] A stretching member, one end of which is detachably connected to the stretching drive assembly, and the other end of which can pass through the first connection hole and be connected to the second connection hole. The stretching drive assembly is used to drive the stretching member to move to generate a stretching force that causes the second fixture to move towards the first fixture.

[0009] In one embodiment, the stretching drive assembly further includes a first sub-stretching member, a second sub-stretching member, and a driving member. The first sub-stretching member is used to abut against the sealing fixture. The second sub-stretching member is located on the side of the first sub-stretching member away from the sealing fixture. One end of the driving member is connected to the first sub-stretching member, and the other end is connected to the second sub-stretching member. The driving member is used to drive the second sub-stretching member to move in a direction away from the first sub-stretching member;

[0010] Wherein, one end of the stretching member is detachably connected to the second sub-stretching member, and the other end sequentially passes through the first sub-stretching member and the first fixture to be connected to the second fixture, so as to provide a stretching force for moving the second fixture towards the first fixture under the drive of the driving member.

[0011] In one embodiment, there are multiple stretching members, and the multiple stretching members are arranged at intervals along the circumferential direction of the second sub-stretching member.

[0012] In one embodiment, the stretching drive assembly includes multiple driving members, and the multiple driving members are arranged at intervals along the circumferential direction of the first sub-stretching member.

[0013] In one embodiment, the driving member is a hydraulic driving member.

[0014] In one embodiment, the stretching device further includes a limiting member, and the limiting member is connected to the side of the second sub-stretching member away from the first sub-stretching member to limit the stretching member.

[0015] In one embodiment, the limiting member is a non-metallic limiting member or a metallic limiting member.

[0016] In one embodiment, the limiting member is arranged in a ring shape.

[0017] In one embodiment, the stretching device further includes a positioning member, and the positioning member is located between the first sub-stretching member and the second sub-stretching member. The positioning member has a positioning through-hole for the stretching member to pass through;

[0018] Wherein, the positioning through-hole corresponds to the positions of the first connection hole and the second connection hole.

[0019] In one embodiment, the stretching device further includes a lifting member, and the lifting member is connected to the side of the second sub-stretching member away from the first sub-stretching member. The lifting member is used to cooperate with an external lifting tooling to lift the stretching device.

[0020] The above stretching device can move the second fixture towards the first fixture under the drive of the stretching drive assembly by passing the stretching member through the first fixture and connecting it to the second fixture, which is easy to remotely stretch the sealing fixture in a narrow space, so that the sealing fixture is clamped, thereby improving work efficiency and reducing the radiation dose of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Structural schematic diagram of a stretching device according to an embodiment of the present invention;

[0022] Figure 2 Schematic diagram during the use of a stretching device according to an embodiment of the present invention;

[0023] Figure 3 Cross-sectional schematic diagram of a stretching device according to an embodiment of the present invention.

[0024] Explanation of reference numerals:

[0025] 100, stretching device; 10, stretching drive assembly; 11, first sub-stretching member; 111, first through hole; 12, second sub-stretching member; 121, second through hole; 13, drive member; 14, hydraulic pipeline; 15, oil circuit distributor; 151, oil circuit distributor body; 152, quick-connect plug; 20, stretching member; 30, limiting member; 31, third through hole; 40, connecting member; 50, positioning member; 60, lifting member; 200, sealing fixture; 210, first fixture; 211, first connection hole; 220, second fixture; 221, second connection hole; 230, fastener. Detailed implementation manners

[0026] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation manners of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0027] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0029] In the present invention, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0031] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0032] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the components are only drawn by way of example in the drawings and not necessarily to the true scale.

[0033] For ease of description, the drawings only show the structures related to the embodiments of the present invention.

[0034] Figure 1 The schematic diagram of the structure of the stretching device in an embodiment of the present invention is shown. Figure 2 The schematic diagram during the use of the stretching device in an embodiment of the present invention is shown, in combination withFigure 1 and Figure 2 As shown in Figure 2 , an embodiment of the present invention provides a stretching device 100 for providing a pulling force to a sealing fixture 200. The sealing fixture 200 includes a first fixture 210 and a second fixture 220 disposed opposite to each other. A clamping space is formed between the first fixture 210 and the second fixture 220. The sealing fixture 200 further includes a plurality of fasteners 230. The first fixture 210 is provided with a plurality of first connection holes 211, and the second fixture 220 is provided with a plurality of second connection holes 221. Each fastener 230 passes through a first connection hole 211 and is connected to a corresponding second connection hole 221 to fasten the first fixture 210 and the second fixture 220. The stretching device 100 includes a stretching drive assembly 10 and a stretching member 20. The stretching drive assembly 10 can be supported on the first fixture 210. One end of the stretching member 20 is detachably connected to the stretching drive assembly 10, and the other end can pass through the first connection hole 211 and be connected to the second connection hole 221. The stretching drive assembly 10 is used to drive the stretching member 20 to move to generate a pulling force that causes the second fixture 220 to move toward the first fixture 210.

[0035] For the stretching device 100 provided in this application, by passing the stretching member 20 through the first fixture 210 and connecting it to the second fixture 220, the second fixture 220 can be made to move toward the first fixture 210 under the drive of the stretching drive assembly 10. Moreover, since the first connection holes 211 and the second connection holes 221 on the existing sealing fixture 200 are used, the structure of the stretching device 100 is simplified, and it is easy to remotely stretch the sealing fixture 200 in a narrow space, so that the sealing fixture 200 is clamped, thereby improving work efficiency and reducing the radiation dose of the staff.

[0036] It should be noted that a sealing filler is provided in the sealing fixture 200. When the stretching device 100 stretches the sealing fixture 200, the second fixture 220 can move toward the first fixture 210 and press tightly on the sealing weld, causing the sealing filler to deform and fit tightly with the weld of the part to be sealed, thereby achieving the sealing of the weld of the part to be sealed. In the embodiment of this application, the sealing fixture 200 is applied to the weld sealing of the control rod drive mechanism. Of course, the sealing fixture 200 can also be applied to other applicable welds or other gaps, which is not limited here.

[0037] In some embodiments, the stretching drive assembly 10 also includes a first sub-stretching member 11, a second sub-stretching member 12 and a driving member 13. The first sub-stretching member 11 is used to resist the sealing clamp 200, and the second sub-stretching member 12 is located on the side of the first sub-stretching member 11 away from the sealing clamp 200. One end of the driving member 13 is connected to the first sub-stretching member 11, and the other end is connected to the second sub-stretching member 12. The driving member 13 is used to drive the second sub-stretching member 12 to move relative to the first sub-stretching member 11 in a direction away from the first sub-stretching member 11, wherein one end of the stretching member 20 is detachably connected to the second sub-stretching member 12, and the other end is sequentially penetrated through the first sub-stretching member 11 and the first clamp 210 to be connected to the second clamp 220, so as to provide a stretching force to move the second clamp 220 toward the first clamp 210 under the drive of the driving member 13. In this way, the second sub-stretching member 12 can be driven by the driving member 13 to move toward the first sub-stretching member 11 , and then the second clamp 220 can be driven by the stretching member 20 to move toward the first clamp 210 .

[0038] It should be noted that, in some embodiments, the sealing fixture 200 can be supported on the part to be sealed, and in other embodiments, the stretching drive assembly 10 can be supported on the part to be sealed, which is not limited here.

[0039] It should also be noted that the first sub-stretching member 11 is placed on the sealing fixture 200 .

[0040] Specifically, in some embodiments, the driving member 13 is a hydraulic driving member 13. The hydraulic driving member 13 has a simple structure and a delicate appearance, and is easy to arrange and install the stretching device 100. In addition, the hydraulic transmission can output a large thrust, and can achieve low-speed and large-tonnage movement, and the performance is stable and reliable. Of course, in some other embodiments, the driving member 13 can also be a driving member such as a screw.

[0041] More specifically, the hydraulic drive element 13 can be a single-acting hydraulic cylinder or a double-acting hydraulic cylinder, which is not limited here. It should be noted that a single-acting hydraulic cylinder refers to a cylinder in which movement in one direction is achieved by oil pressure, and returns to its original position by self-weight or external forces such as springs. Only one end of the two chambers of a single-acting hydraulic cylinder has oil, and the other end is in contact with air. A double-acting hydraulic cylinder has oil in both chambers, and movement in both directions is achieved by oil pressure.

[0042] In some embodiments, the first sub-stretching member 11 is provided with a first through hole 111, and the inner contour of the first through hole 111 matches the outer contour of the component to be sealed, so that the inner wall of the first through hole 111 can be prevented from damaging the component to be sealed.

[0043] In some other embodiments, the second sub-stretching member 12 is provided with a second through hole 121, and the inner contour of the second through hole 121 matches the outer contour of the member to be sealed. In this way, damage to the member to be sealed by the inner wall of the second through hole 121 can be avoided.

[0044] In the embodiments of the present application, the first sub-stretching member 11 is provided with a first through hole 111, and the second sub-stretching member 12 is provided with a second through hole 121. The inner contours of the first through hole 111 and the second through hole 121 both match the outer contour of the member to be sealed.

[0045] More specifically, the inner contours of the first through hole 111 and the second through hole 121 are both circular.

[0046] In some embodiments, the outer contour of the first sub-stretching member 11 is square. In this way, the structural arrangement of the stretching device 100 can be made more reasonable and more aesthetically pleasing.

[0047] In some other embodiments, the outer contour of the second sub-stretching member 12 is square. In this way, the structural arrangement of the stretching device 100 can be made more reasonable and more aesthetically pleasing.

[0048] In the embodiments of the present application, the outer contours of the first sub-stretching member 11 and the second sub-stretching member 12 are both square.

[0049] Preferably, the first sub-stretching member 11 and the second sub-stretching member 12 have the same size. In this way, the manufacturing process of the stretching device 100 can be made simpler, and it is easy to replace when the first sub-stretching member 11 or the second sub-stretching member 12 is damaged.

[0050] In some embodiments, there are multiple stretching members 20. The multiple stretching members 20 are arranged at intervals along the circumferential direction of the second sub-stretching member 12. In this way, the multiple stretching members 20 can apply force to the second fixture 220 evenly, avoiding tilting of the second fixture 220 due to uneven force during the stretching process.

[0051] Specifically, in some embodiments, there are eight stretching members 20. The eight stretching members 20 are arranged at intervals along the circumferential direction on the second sub-stretching member 12.

[0052] In some embodiments, the stretching drive assembly 10 includes multiple drive members 13. The multiple drive members 13 are arranged at intervals along the circumferential direction on the first sub-stretching member 11. In this way, the driving force applied to the second sub-stretching member 12 can be made more stable and reliable through the multiple drive members 13, so as to stretch the second sub-stretching member 12 evenly.

[0053] In some specific embodiments, the stretching drive assembly 10 includes four drive members 13, and the four drive members 13 are circumferentially spaced apart and arranged on the first sub-stretching member 11. In this way, the four drive members 13 can better provide a stable driving force for the second sub-stretching member 12.

[0054] In some embodiments, the stretching drive assembly 10 further includes a plurality of hydraulic pipelines 14, and the plurality of hydraulic pipelines 14 are respectively connected to the plurality of drive members 13 one by one. The hydraulic pipelines 14 are used to introduce hydraulic oil into the drive members 13. In this way, the hydraulic oil can be introduced into each drive member 13 through the plurality of hydraulic pipelines 14.

[0055] Furthermore, the stretching drive assembly 10 further includes an oil circuit distributor 15, and the oil circuit distributor 15 is connected to the plurality of hydraulic pipelines 14 to introduce the hydraulic oil into the hydraulic pipelines 14. In this way, the oil circuit distributor 15 can reliably and evenly distribute the hydraulic oil.

[0056] In the embodiments of the present application, the oil circuit distributor 15 includes an oil circuit distributor body 151 and a quick-connect plug 152 connected to the oil circuit distributor body 151 for quick mating with external components. In this way, the stretching device 100 can be quickly installed and connected to the hydraulic pump station through the quick-connect plug 152, improving work efficiency.

[0057] In some embodiments, the stretching device 100 further includes a limiting member 30, and the limiting member 30 is connected to the side of the second sub-stretching member 12 facing away from the first sub-stretching member 11 to limit the stretching member 20. In this way, the limiting member 30 can prevent the stretching member 20 from coming out.

[0058] In some specific embodiments, the limiting member 30 is a non-metallic limiting member 30 or a metal limiting member. In the embodiments of the present application, the limiting member 30 is a non-metallic limiting member 30. The non-metallic limiting member 30 can serve as the initial guiding part of the stretching device 100 and can also prevent the stretching device 100 from scratching the part to be sealed during the installation process. In addition, the non-metallic limiting member 30 can also reduce the weight of the stretching device 100.

[0059] More specifically, the non-metallic limiting member 30 can be a rubber limiting member 30 or a plastic limiting member 30, etc., which is not limited herein.

[0060] In some other specific embodiments, the limiting member 30 can also be a metal limiting member.

[0061] In some embodiments, the limiting member 30 is arranged in a ring shape. In this way, the part to be sealed can enter, and the ring-shaped arrangement of the limiting member 30 can make the limiting effect of the limiting member 30 on the stretching member 20 better.

[0062] In an embodiment of the present application, the limiting member 30 has a third through hole 31, and the internal contour of the third through hole 31 matches the external contour of the member to be sealed. More specifically, the third through hole 31 is circular. Preferably, the size of the third through hole 31 is equal to both the first through hole 111 and the second through hole 121.

[0063] In some embodiments, the stretching device 100 further includes a connecting member 40. One end of the connecting member 40 is connected to the limiting member 30, and the other end is connected to the second sub-stretching member 12. In this way, the connecting member 40 can be fixed more reliably and prevented from separating from the second sub-stretching member 12.

[0064] Specifically, in some embodiments, one end of the connecting member 40 is threadedly connected to the limiting member 30, and the other end is threadedly connected to the second sub-stretching member 12. In this way, the fixing can be made more stable and reliable through the threaded connection.

[0065] In some embodiments, there are multiple connecting members 40, and the multiple connecting members 40 are circumferentially arranged on the second sub-stretching member 12. In this way, the fixing of the limiting member 30 can be made more stable and reliable.

[0066] In an embodiment of the present application, the connecting member 40 includes four, and the four connecting members 40 are circumferentially arranged on the second sub-stretching member 12.

[0067] Figure 3 The cross-sectional schematic diagram of the stretching device in an embodiment of the present invention is shown. As Figure 2 shown, in some embodiments, the stretching device 100 further includes a positioning member 50. The positioning member 50 is located between the first sub-stretching member 11 and the second sub-stretching member 12. The positioning member 50 has a positioning through hole for the stretching member 20 to pass through. Among them, the positioning through hole corresponds to the positions of the first connection hole 211 and the second connection hole 221. In this way, through the positioning member 50, quick centering can be achieved when installing the stretching device 100, so that it is easy to accurately dock the stretching device 100 with the sealing fixture 200.

[0068] Specifically, in some embodiments, the positioning member 50 includes a hollow positioning pin. In this way, the structure of the hollow positioning pin is simpler, and stable connection can be achieved.

[0069] In an embodiment of the present application, the positioning member 50 at least partially penetrates the first sub-stretching member 11. In this way, the fixing of the positioning member 50 can be made more reliable.

[0070] In some embodiments, there are multiple positioning members 50, and the multiple positioning members 50 are circumferentially spaced apart from each other on the first sub-stretching member 11. In this way, the multiple positioning members 50 can position the stretching member 20 from multiple positions, so that the stretching device 100 can be more easily mated and docked with the sealing fixture 200.

[0071] Specifically, in some embodiments, there are two positioning members 50, and the two positioning members 50 are spaced apart on the first sub-stretching member 11. In this way, the two positioning members 50 can position the stretching member 20, and can avoid excessive tapping, which reduces the strength of the first sub-stretching member 11. At the same time, it can also make the structural layout more reasonable.

[0072] Please refer to again Figure 1 In some embodiments, the stretching device 100 further includes a lifting member 60. The lifting member 60 is connected to the side of the second sub-stretching member 12 facing away from the first sub-stretching member 11. The lifting member 60 is used to cooperate with an external lifting tooling to lift the stretching device 100. In this way, through the lifting member 60, it is easy for an external component to lift the stretching device 100, so as to remotely install the stretching device 100, improve work efficiency, and reduce the radiation dose of the staff.

[0073] Specifically, in some embodiments, there are multiple lifting members 60, and the multiple lifting members 60 are circumferentially spaced apart on the second sub-stretching member 12. In this way, the multiple lifting members 60 can cooperate with an external component from multiple positions, so that during the lifting process, the stretching device 100 is stressed stably and does not tilt or fall.

[0074] Specifically, in the embodiments of the present application, there are two lifting members 60, and the two lifting members 60 are spaced apart on the second sub-stretching member 12. In this way, the two lifting members 60 can ensure the lifting stability while avoiding excessive lifting members 60 that cause the first sub-stretching member 11 to bear too much weight, and can also avoid occupying the space of the first sub-stretching member 11, making the structural layout more reasonable.

[0075] In the embodiments of the present application, one end of the lifting member 60 is connected to the limiting member 30, and the other end is connected to the second sub-stretching member 12. In this way, through the lifting member 60, a certain supporting force can also be provided for the limiting member 30, and the stability of the lifting member 60 can be improved. Of course, in other embodiments, the lifting member 60 can also be only connected to the second sub-stretching member 12, and this is not limited here.

[0076] In some embodiments, the lifting member 60 has a mating screw hole for connecting to an external component, and the external component can be threadedly connected to the mating screw hole. In this way, the reliability of the lifting can be ensured. Of course, in some other embodiments, the outer wall of the lifting member 60 can also be provided with threads to connect to an external component, and this is not limited here.

[0077] The stretching device 100 provided by the embodiments of the present application has at least the following beneficial effects:

[0078] (1) By threading the stretching member 20 through the first fixture 210 and connecting it to the second fixture 220, the second fixture 220 can be driven to move towards the first fixture 210 under the drive of the stretching drive assembly 10. Moreover, since the first connection hole 211 and the second connection hole 221 on the existing sealing fixture 200 are used, the structure of the stretching device 100 is simplified, and it is easy to remotely stretch the sealing fixture 200 in a narrow space, causing the sealing fixture 200 to clamp, thereby improving work efficiency and reducing the radiation dose of the staff.

[0079] (2) Multiple stretching members 20 can apply force to the second fixture 220 evenly, preventing the second fixture 220 from tilting due to uneven force during stretching.

[0080] (3) The non-metallic limiting member 30 can prevent the stretching member 20 from coming out and can also serve as the initial guiding part of the stretching device 100, preventing the stretching device 100 from scratching the part to be sealed during installation. In addition, the non-metallic limiting member 30 can also reduce the weight of the stretching device 100.

[0081] (4) By means of the positioning member 50, rapid centering can be achieved when installing the stretching device 100, making it easy for the stretching device 100 to accurately dock with the sealing fixture 200.

[0082] (5) The oil circuit distributor 15 includes an oil circuit distributor body 151 and a quick-connect plug 152 connected to the oil circuit distributor body 151. The quick-connect plug 152 can achieve the rapid installation and connection of the stretching device 100 and the hydraulic pump station, improving work efficiency.

[0083] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as within the scope described in this specification.

[0084] The above-described embodiments merely represent several implementation manners of the present invention. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. A stretching device for providing a tensile force to a sealing fixture, the sealing fixture comprising a first fixture and a second fixture arranged oppositely, a clamping space being formed between the first fixture and the second fixture, the sealing fixture further comprising a plurality of fasteners, the first fixture being provided with a plurality of first connection holes, the second fixture being provided with a plurality of second connection holes, each of the fasteners passing through one of the first connection holes and being connected to a corresponding one of the second connection holes to fasten the first fixture and the second fixture, characterized in that, The stretching device comprises: A stretching drive assembly capable of being supported on the first clamp; A stretching member, one end of which is detachably connected to the stretching driving assembly, and the other end of which is capable of passing through the first connecting hole and connecting to the second connecting hole, wherein the stretching driving assembly is used to drive the stretching member to move so as to generate a stretching force that moves the second clamp toward the first clamp; The stretching driving assembly further includes a first sub-stretching member, a second sub-stretching member and a driving member, wherein the first sub-stretching member is used to abut against the sealing fixture, the second sub-stretching member is located at a side of the first sub-stretching member away from the sealing fixture, one end of the driving member is connected to the first sub-stretching member, and the other end is connected to the second sub-stretching member, and the driving member is used to drive the second sub-stretching member to move in a direction away from the first sub-stretching member; One end of the stretching member is detachably connected to the second sub-stretching member, and the other end is sequentially passed through the first sub-stretching member and the first clamp to be connected to the second clamp, so as to provide a stretching force to move the second clamp toward the first clamp under the driving of the driving member; The stretching device further includes a limiting member connected to a side of the second sub-stretching member facing away from the first sub-stretching member to limit the position of the stretching member.

2. The stretching device according to claim 1, characterized in that, The plurality of tensile members are arranged in a spaced relationship from one another along a circumferential direction of the second sub-tensile member.

3. The stretching device according to claim 1, characterized in that, The stretching drive assembly includes a plurality of drive members, and the plurality of drive members are arranged spaced apart from each other along the circumference of the first sub-stretching member.

4. The stretching device according to claim 1, characterized in that, The driving component is a hydraulic driving component.

5. The stretching device according to claim 1, characterized in that, The limiting component is a non-metal limiting component or a metal limiting component.

6. The stretching device according to claim 1, wherein, The limiting member is arranged in a ring shape.

7. The stretching device according to claim 1, wherein, The stretching device further comprises a positioning member, the positioning member is located between the first sub-stretching member and the second sub-stretching member, and the positioning member has a positioning through hole for the stretching member to pass through; Wherein, the positioning through hole corresponds to the position of the first connecting hole and the second connecting hole.

8. The stretching device according to claim 1, characterized in that The stretching device further comprises a hanging member connected to a side of the second sub-stretching member facing away from the first sub-stretching member, and the hanging member is used to cooperate with an external hanging tool to hang the stretching device.

9. The stretching device according to claim 1, wherein The stretching drive assembly includes a plurality of hydraulic pipelines, the plurality of hydraulic pipelines are connected to the plurality of driving members in a one-to-one correspondence, and the hydraulic pipelines are used to introduce oil into the driving members.

10. The stretching device according to claim 9, characterized in that, The stretching drive assembly further comprises an oil circuit distributor, which is connected to the plurality of hydraulic pipelines to introduce oil into the hydraulic pipelines.

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