Injection device of bolt loosening agent and adding equipment of bolt loosening agent

Abstract

The invention belongs to the technical field of nuclear power overhaul, and particularly relates to a bolt loosening agent injection device and bolt loosening agent adding equipment, the injection device comprises a clamping assembly and a liquid supply assembly, the clamping assembly comprises a clamping jaw and a liquid injection connector arranged on the clamping jaw, the clamping jaw is used for being clamped on the side wall of a bolt in a matched mode, and the liquid injection connector is arranged on the clamping jaw. A liquid outlet of the liquid injection connector protrudes out of the clamping jaw and can make contact with the side wall of the bolt. The liquid supply assembly comprises a first liquid storage part, a first pump and a first connecting pipe, the first connecting pipe is connected with the liquid injection connector and the first liquid storage part, and the first pump is connected with the first connecting pipe and conveys the loosening agent in the first liquid storage part to the liquid outlet of the liquid injection connector to flow out. Thus, the liquid outlet of the liquid injection connector makes contact with the side wall of the bolt, and the loosening agent flowing out of the liquid outlet of the liquid injection connector can flow downwards into the gap between the bolt and the hole wall of the screw hole along the side wall of the bolt, so that the thread is soaked, and effective lubrication of the thread is achieved.

Description

Technical Field

[0001] This application belongs to the field of nuclear power plant maintenance technology, and more specifically, it relates to a bolt loosening agent injection device and a bolt loosening agent addition device. Background Technology

[0002] Reactor pressure vessels are used to contain nuclear fuel and fission products. They are subjected to high temperature, high pressure and strong radiation environment for a long time. The main bolts of the reactor pressure vessel are the core components for fastening the top cover and cylinder of the reactor pressure vessel. They cooperate with the flanges on the cover and cylinder to ensure that the flange faces between the top cover and cylinder are tightly fitted and sealed through huge preload, preventing the leakage of radioactive materials.

[0003] During major overhauls and parts changes, a certain amount of bolt loosening agent is typically injected into the main bolt hole before unscrewing the bolt to lubricate the threads and reduce the unscrewing torque. In related technologies, a bottle containing the loosening agent is often used to inject it through the center hole of the main bolt. The loosening agent needs to slowly seep into the bottom of the main bolt hole from the gap in the center hole, and then slowly seep upwards into the threaded portion of the main bolt that contacts the main bolt hole. This method results in a long time for the loosening agent to flow and seep in, increases the radiation dose to the workers, and after the main bolt is unscrewed, it is found that the thread wetting effect is poor, with some threads not being sufficiently lubricated, making it difficult to tighten the main bolt and hindering efficiency. Summary of the Invention

[0004] The purpose of this application is to provide a bolt loosening agent injection device and a bolt loosening agent addition device, which aims to improve the injection efficiency of loosening agent when disassembling nuts, thereby improving the nut disassembly and assembly efficiency.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: A bolt loosening agent injection device is provided, comprising a clamping assembly and a liquid supply assembly. The clamping assembly includes a jaw and a liquid injection connector disposed on the jaw. The jaw is adapted to clamp the side wall of the bolt. The liquid outlet of the liquid injection connector protrudes from the jaw and is capable of contacting the side wall of the bolt. The liquid supply assembly includes a first liquid reservoir, a first pump, and a first connecting pipe. The first liquid reservoir is used to store the loosening agent. The first connecting pipe connects the liquid injection connector and the first liquid reservoir. The first pump is connected to the first connecting pipe and is used to deliver the loosening agent in the first liquid reservoir to the outlet of the liquid injection connector.

[0006] In some embodiments, the gripper includes a first half-jaw and a second half-jaw that can be opened and closed, forming a clamping space between the first half-jaw and the second half-jaw for bolt insertion, and at least one of the first half-jaw and the second half-jaw is provided with a liquid injection connector, the liquid injection connector having an outlet extending into the clamping space.

[0007] In some embodiments, the first half-claw has a first clamping surface facing the second half-claw, and the second half-claw has a second clamping surface facing the first half-claw. Both the first clamping surface and the second clamping surface are concave arc surfaces adapted to the sidewall of the bolt. The clamping space is a circular space located between the first clamping surface and the second clamping surface. The liquid outlet of the liquid injection connector protrudes radially from the corresponding first clamping surface or second clamping surface along the clamping space.

[0008] In some embodiments, the clamping assembly includes a plurality of liquid injection connectors, with the first half-claw and the second half-claw each having a plurality of liquid injection connectors, and each liquid injection connector being evenly spaced along the circumference of the clamping space.

[0009] In some embodiments, a first protrusion is provided on a first clamping surface protruding toward a circular space, and a second protrusion is provided on a second clamping surface protruding toward a circular space. The protrusion distance of the first protrusion from the first clamping surface is equal to the protrusion distance of the liquid injection connector from the first clamping surface, and the protrusion distance of the second protrusion from the second clamping surface is equal to the protrusion distance of the liquid injection connector from the second clamping surface. The first and second protrusions are used to abut against the sidewall of the bolt.

[0010] In some embodiments, the injection device further includes a liquid suction assembly, and the gripper is provided with a liquid suction port for fitting against the flange face of the mounting bolt and perpendicular to the bolt axis. The liquid suction assembly includes a second liquid reservoir, a second pump, and a second connecting pipe. The second connecting pipe connects the liquid suction port and the second liquid reservoir. The second pump is connected to the second connecting pipe and is used to draw the loosening agent flowing out onto the flange face into the second liquid reservoir.

[0011] In some embodiments, the suction port is an arc-shaped opening adapted to the sidewall of the bolt, and at least one suction port is provided on each of the opposite sides of the jaws. The suction ports located on both sides of the jaws can fit against the flange surface from the opposite sides of the bolt.

[0012] In some embodiments, the gripper is further provided with a liquid suction connector, one end of which is inserted into the gripper and communicates with the liquid suction port, and the other end of which is exposed outside the gripper and connected to the second connecting tube.

[0013] In some embodiments, the clamping assembly further includes an operating arm for driving the gripper to clamp or release the bolt, and both the liquid supply assembly and the liquid suction assembly are mounted on the operating arm.

[0014] Another embodiment of this application provides a bolt loosening agent adding device, including the above-described bolt loosening agent injection device and a suction device, which is connected to the center hole of the bolt to suction air from the center hole.

[0015] The beneficial effects of the bolt loosening agent injection device provided in this application are as follows: In use, the clamping jaws of the clamping assembly are clamped on the side wall of the bolt, and the jaws encircle the bolt from the side wall of the bolt. The outlet of the injection connector provided on the jaws contacts the side wall of the bolt. At this time, when the first pump is started, the loosening agent in the first reservoir is pumped to the injection connector through the first connecting pipe. The loosening agent flows out from the outlet of the injection connector. Since the outlet contacts the side wall of the bolt, the loosening agent flowing out from the outlet of the injection connector can flow down along the side wall of the bolt into the gap between the bolt and the bolt hole wall, thereby wetting the threads and achieving effective lubrication of the threads. In this way, the loosening agent is injected directly from above the bolt hole. Under the action of gravity, the loosening agent flows directly down the side wall of the bolt into the bolt hole. Compared with injecting the loosening agent from the center hole, this effectively shortens the flow path of the loosening agent, thereby shortening the time for the loosening agent to wet the threads and thus effectively improving the efficiency of nut disassembly and assembly. In addition, compared with directly pouring the loosening agent, this application sets the outlet of the injection connector to contact the side wall of the bolt, so that the loosening agent can flow closely to the side wall of the bolt, which can also reduce the risk of spillage or spillage of the loosening agent and causing pollution. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a sectional view of a partial structure in a bolted connection to a flange in related technologies; Figure 2 A schematic diagram of the bolt loosening agent injection device provided in an embodiment of this application; Figure 3 for Figure 2 Another perspective view of the bolt loosening agent injection device shown; Figure 4 for Figure 2 A partial structural schematic diagram of the bolt loosening agent injection device is shown; Figure 5 A schematic diagram of the clamping assembly of a bolt loosening agent injection device provided in another embodiment of this application; Figure 6 for Figure 2 A partial structural schematic diagram of the liquid supply assembly of the bolt loosening agent injection device shown; Figure 7 for Figure 6 An exploded view of the structure shown; Figure 8For along Figure 4 A cross-sectional view along line AA in the middle.

[0018] The following are the labeling elements in the figure: 10. Clamping assembly; 11. Gripper; 110. Clamping space; 111. First half-jaw; 1111. First clamping surface; 1112. First protrusion; 112. Second half-jaw; 1121. Second clamping surface; 1122. Second protrusion; 113. Suction port; 12. Injection connector; 13. Operating arm; 131. Handle; 14. Suction connector; 20. Liquid supply assembly; 21. First liquid storage unit; 211. Liquid outlet connector; 212. Liquid inlet connector; 213. Housing; 2130. Cavity; 2131. First part; 2132. Second part; 22. First pump; 30. Liquid suction assembly; 31. Second liquid storage unit; 311. Liquid return connector; 100. Bolt; 101. Threaded hole; 102. Center hole; 200, Flange; 201, Flange face. Detailed Implementation

[0019] To make the technical problem to be solved, the technical solution and the beneficial effects of this application clearer, the following is in conjunction with the appendix. Figures 1 to 8 The present application will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the scope of the present application.

[0020] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0021] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] Furthermore, 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 number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, "multiple sets" means two or more sets, "multiple pieces" means two or more pieces, and "several" means one or more, unless otherwise explicitly specified.

[0023] The reactor pressure vessel is used to contain nuclear fuel and fission products. It withstands high temperature, high pressure, and strong radiation environments for extended periods. The main bolts of the reactor pressure vessel are the core components that fasten the top cover and cylinder of the vessel. They mate with the flanges on the cover and cylinder, and through a huge preload, ensure that the flange faces between the top cover and cylinder are tightly fitted and sealed to prevent the leakage of radioactive materials. During refueling overhauls, a monolithic bolt tensioning machine is used to tighten or loosen the main bolts to open and close the reactor pressure vessel. Typically, to reduce the torque required to tighten or loosen the main bolts, an anti-seize agent is applied to the threads of the main bolts before tightening them to prevent the threads from seizing during tightening or after one cycle of unit operation. At the same time, before loosening the main bolts, a certain amount of bolt loosening agent is usually injected into the main bolt hole to soften and wet the hardened anti-seize agent and to lubricate the threads to reduce the unscrewing torque.

[0024] In related technologies, before unscrewing the main bolt, a bottle containing a loosening agent is often used to inject the agent into the center hole of the main bolt. The loosening agent needs to slowly seep into the bottom of the main bolt hole through the gap in the center hole, and then slowly seep upwards into the threaded portion of the main bolt that contacts the main bolt hole. This method takes a long time for the loosening agent to flow and seep in, increases the radiation dose to the workers, and after the main bolt is unscrewed, it is found that the thread wetting effect is poor, with some threads not being sufficiently lubricated, making it difficult to tighten the main bolt and hindering efficiency.

[0025] Based on this, embodiments of this application provide an injection device for bolt loosening agent and an addition device for bolt loosening agent to solve the above problems.

[0026] Please refer to the following: Figures 1 to 8 The bolt loosening agent injection device provided in this application embodiment is applicable, but not limited to, for disassembling and assembling nuts connected to various equipment and devices during the maintenance of nuclear power plant equipment, such as for disassembling and assembling the main bolts connected between the cover and cylinder of a pressure vessel.

[0027] In the embodiments of this application, such as Figures 2 to 4As shown, the bolt loosening agent injection device includes a clamping assembly 10 and a liquid supply assembly 20. The clamping assembly 10 includes a jaw 11 and a liquid injection connector 12 disposed on the jaw 11. The jaw 11 is used to fit and clamp the side wall of the bolt 100. The liquid outlet of the liquid injection connector 12 protrudes from the jaw 11 and can be used to contact the side wall of the bolt 100. The liquid supply assembly 20 includes a first liquid storage component 21, a first pump 22 and a first connecting pipe (not shown). The first liquid storage component 21 is used to store the loosening agent. The first connecting pipe connects the liquid injection connector 12 and the first liquid storage component 21. The first pump 22 is connected to the first connecting pipe and is used to deliver the loosening agent in the first liquid storage component 21 to the outlet of the liquid injection connector 12.

[0028] In this embodiment, the gripper 11 is adapted to clamp the side wall of the bolt 100. The gripper 11 can be an opening and closing clamping structure, which changes the internal space by opening and closing to insert the bolt 100. Alternatively, the gripper 11 can also be an annular sleeve structure, which is sleeved from the top of the bolt 100 downwards to the outside of the side wall of the bolt 100. The injection connector 12 is mounted on the clamp 11. One end of the injection connector 12 is connected to the first connecting pipe of the liquid supply assembly 20, so that the loosening agent can flow into the injection connector 12 from the first connecting pipe. The other end of the injection connector 12 extends into the internal space defined by the clamp 11 and forms the outlet of the injection connector 12. When the clamp 11 is gripped on the side of the bolt 100, the end face of the end can contact the side of the bolt 100. Contact with the side of the bolt 100 means that the injection connector 12 has an end facing the side wall of the bolt 100, and the end face of the end maintains slight contact with the side wall of the bolt 100. The side wall of the bolt 100 does not obstruct the flow of the loosening agent. That is, the loosening agent can flow smoothly from the outlet of the injection connector 12, and the loosening agent after flowing out will directly contact the side wall of the bolt 100 and continue to flow along the side wall of the bolt 100.

[0029] In this embodiment, the liquid supply assembly 20 is used to supply loosening agent to the injection connector 12. The liquid supply assembly 20 includes a first liquid reservoir 21, a first pump 22, and a first connecting pipe. The first liquid reservoir 21 contains the loosening agent. The first connecting pipe connects the first liquid reservoir 21 and the injection connector 12. The first pump 22 is mounted on the first connecting pipe or inside the first liquid reservoir 21 and is used to provide driving pressure to drive the loosening agent through the first connecting pipe into the injection connector 12. The first liquid reservoir 21 and the first pump 22 can be mounted on the clamping assembly 10 and operate together with the clamping assembly 10, or they can be independently disposed outside the clamping assembly 10 and operate independently of the clamping assembly 10.

[0030] In the bolt loosening agent injection device of this application embodiment, when in use, the clamping jaws 11 of the clamping assembly 10 are clamped on the side wall of the bolt 100. The clamping jaws 11 encircle the bolt 100 from the side wall of the bolt 100. The outlet of the injection connector 12 provided on the clamping jaws 11 contacts the side wall of the bolt 100. At this time, when the first pump 22 is started, the loosening agent in the first reservoir 21 is transported to the injection connector 12 through the first connecting pipe. The loosening agent flows out from the outlet of the injection connector 12. Since the outlet is in contact with the side wall of the bolt 100, the loosening agent flowing out from the outlet of the injection connector 12 can flow down along the side wall of the bolt 100 into the gap between the bolt 100 and the wall of the threaded hole 101, thereby wetting the threads and achieving effective lubrication of the threads.

[0031] In this way, the loosening agent is injected directly from above the bolt hole 101. Under the action of gravity, the loosening agent flows directly down the side wall of the bolt 100 into the gap between the bolt 100 and the bolt hole 101. Compared with injecting the loosening agent from the center hole 102 of the bolt 100, it effectively shortens the flow path of the loosening agent, thereby shortening the time for the loosening agent to wet the threads and thus effectively improving the efficiency of nut disassembly and assembly. In addition, compared with directly pouring the loosening agent, this application sets the outlet of the injection connector 12 to contact the side wall of the bolt 100, so that the loosening agent can flow closely to the side wall of the bolt 100, which can also reduce the risk of pollution caused by the loosening agent overflowing or spilling.

[0032] In some embodiments, such as Figures 2 to 4 As shown, the gripper 11 includes a first half-jaw 111 and a second half-jaw 112 that can be opened and closed. A clamping space 110 for inserting a bolt 100 is formed between the first half-jaw 111 and the second half-jaw 112. At least one of the first half-jaw 111 and the second half-jaw 112 is provided with a liquid injection connector 12. The liquid injection connector 12 extends into the clamping space 110.

[0033] In this embodiment, the gripper 11 includes a first half-jaw 111 and a second half-jaw 112. The first half-jaw 111 and the second half-jaw 112 are movably connected. The movable connection means that the first half-jaw 111 and the second half-jaw 112 are movably connected by a hinge, pin, or elastic connector, so that the first half-jaw 111 and the second half-jaw 112 can open to increase the clamping space 110 between them so that the bolt 100 can be inserted. After they are closed, they can surround the outer periphery of the bolt 100 and clamp the side wall of the bolt 100, thereby forming a stable clamping state.

[0034] In this embodiment, as Figures 2 to 4As shown, at least one of the first half-claw 111 and the second half-claw 112 is provided with an injection connector 12. That is, the first half-claw 111 is provided with an injection connector 12, or the second half-claw 112 is provided with an injection connector 12, or both the first half-claw 111 and the second half-claw 112 are provided with injection connectors 12. The injection port of the injection connector 12 protrudes from the corresponding first half-claw 111 or the second half-claw 112 and extends into the clamping space 110. In this way, when the clamp 11 clamps the bolt 100, the outlet of the injection connector 12 can maintain stable and reliable contact with the side wall of the bolt 100. After the loosening agent flows out from the outlet, it can directly adhere to the side wall surface of the bolt 100 without passing through the gap, thereby reducing the risk of loosening agent spillage and ensuring the injection efficiency of the loosening agent.

[0035] In some embodiments, such as Figures 2 to 4 As shown, the clamping assembly 10 includes multiple liquid injection connectors 12. The first half-claw 111 and the second half-claw 112 are respectively provided with multiple liquid injection connectors 12, and each liquid injection connector 12 is evenly spaced along the circumference of the clamping space 110.

[0036] Thus, multiple injection joints 12 are respectively provided in the first half-jaw 111 and the second half-jaw 112. The multiple injection joints 12 are evenly spaced along the circumference of the clamping space 110, that is, the multiple injection joints 12 are evenly spaced around the circumference of the bolt 100, thereby providing multiple injection points on the side of the bolt 100. The loosening agent is injected into the multiple injection points at the same time. The loosening agent can spread evenly along the circumference of the bolt 100 and penetrate downwards, thereby enabling the loosening agent to penetrate the threads more comprehensively, improving the injection efficiency of the loosening agent and improving the wetting effect.

[0037] It is understandable that the number of injection connectors 12 can be 4, 5, 6 or more. The number can be selected according to the diameter of the bolt 100. When the diameter of the bolt 100 is large, a relatively large number of injection connectors 12 can be set, while when the diameter of the bolt 100 is small, a smaller number of injection connectors 12 can be set.

[0038] As an example, the first half-claw 111 and the second half-claw 112 are respectively provided with two injection connectors 12. The included angle between the center lines of the injection ports of two adjacent injection connectors 12 is about 90°, that is, an injection connector 12 is provided every 90° along the circumference of the bolt 100 for injecting loosening agent.

[0039] It should be noted that, in specific embodiments, when there are multiple injection connectors 12, the liquid supply assembly 20 may include multiple first connecting pipes, and the first liquid storage component 21 may be provided with multiple outlets for the loosening agent to flow out. Each outlet is connected to an injection connector 12 through a first connecting pipe. Alternatively, the first connecting pipe may also include a main pipe and multiple branch pipes connected to the main pipe. Each branch pipe is connected to each injection connector 12. The first liquid storage component 21 has an outlet, and the main pipe is connected to the outlet so that the loosening agent is drawn out from the first liquid storage component 21 and then distributed to the corresponding injection connectors 12 through the branch pipes.

[0040] In some embodiments, such as Figures 2 to 4 As shown, the first half-claw 111 has a first clamping surface 1111 facing the second half-claw 112, and the second half-claw 112 has a second clamping surface 1121 facing the first half-claw 111. The first clamping surface 1111 and the second clamping surface 1121 are both concave arc surfaces adapted to the side wall of the bolt 100. The clamping space 110 is a circular space located between the first clamping surface 1111 and the second clamping surface 1121. The liquid outlet of the liquid injection connector 12 protrudes radially from the corresponding first clamping surface 1111 or second clamping surface 1121 along the clamping space 110.

[0041] In this embodiment, both the first clamping surface 1111 of the first half-claw 111 and the clamping surface of the second half-claw 112 are concave arc surfaces. These two concave arc surfaces are adapted to the shapes of opposite sides of the sidewall of the bolt 100. A circular clamping space 110 is formed between the first clamping surface 1111 and the second clamping surface 1121, allowing the clamping jaws 11 to clamp the bolt 100 from various directions, making the engagement operation more flexible and convenient. Thus, the injection port of the injection connector 12 protrudes radially from the corresponding first clamping surface 1111 or second clamping surface 1121 along the circular space. The clamping jaws 11, clamping the bolt 100 from any direction, ensure that the injection port of the injection connector 12 remains reliably in contact with the sidewall of the bolt 100.

[0042] In some embodiments, such as Figure 5 As shown, a first protrusion 1112 is provided on the first clamping surface 1111 protruding towards the circular space, and a second protrusion 1122 is provided on the second clamping surface 1121 protruding towards the circular space. The protrusion distance of the first protrusion 1112 from the first clamping surface 1111 is equal to the protrusion distance of the liquid injection connector 12 from the first clamping surface 1111, and the protrusion distance of the second protrusion 1122 from the second clamping surface 1121 is equal to the protrusion distance of the liquid injection connector 12 from the second clamping surface 1121. The first protrusion 1112 and the second protrusion 1122 are used to abut against the side wall of the bolt 100.

[0043] In this embodiment, the first clamping surface 1111 is provided with a first protrusion 1112 facing the circular space, i.e., the clamping space 110, and the second clamping surface 1121 is also provided with a second protrusion 1122 facing the clamping space 110. When the jaw 11 clamps the bolt 100, the first protrusion 1112 and the second protrusion 1122 abut against the side wall of the bolt 100. The liquid outlet of each liquid injection connector 12 and the first protrusion 1112 or the second protrusion 1122 located on the same side have the same radial protrusion length in the circular space, and remain flush in the circular space.

[0044] Thus, by setting the protrusion dimensions of the first protrusion 1112 and the second protrusion 1122 from their corresponding clamping surfaces, the distance between the injection port of the injection connector 12 and the side wall of the bolt 100 can be limited. When the clamp 11 clamps the bolt 100, the first protrusion 1112 and the second protrusion 1122 abut against the side wall of the bolt 100. The pressure generated by clamping mainly acts on the first protrusion 1112 and the second protrusion 1122, while the outlet of the injection connector 12 only needs to be close to the side wall of the bolt 100 and maintain slight contact with the side wall of the bolt 100. It does not need to bear the clamping force, thereby reducing the risk of deformation and blockage of the outlet caused by the bolt 100 directly squeezing the outlet, and ensuring the smooth flow of the loosening agent.

[0045] In some embodiments, such as Figure 2 , Figure 4 and Figure 8 As shown, the injection device also includes a liquid suction assembly 30, and the gripper 11 is also provided with a liquid suction port 113. The liquid suction port 113 is used to fit against the flange face 201 of the mounting bolt 100 and perpendicular to the axis of the bolt 100. The liquid suction assembly 30 includes a second liquid storage component 31, a second pump (not shown) and a second connecting pipe (not shown). The second connecting pipe connects the liquid suction port 113 and the second liquid storage component 31. The second pump is connected to the second connecting pipe and is used to draw the loosening agent flowing out onto the flange face 201 into the second liquid storage component 31.

[0046] In this regard, please understand that, please combine them together. Figure 1 The flange face 201, which is perpendicular to the axis of the bolt 100 and is used to mount the bolt 100, refers to the surface of the workpiece through which the bolt 100 passes, such as the connecting flange 200 of the equipment housing, when the bolt 100 is installed on the equipment. This surface faces the head of the bolt 100 and is perpendicular to the axis of the bolt 100. When the gripper 11 clamps the bolt 100, it has a clamping surface facing the side wall of the bolt 100 (such as the first clamping surface 1111 and the second clamping surface 1121 in the aforementioned embodiment). In addition, the gripper 11 also has a bottom surface perpendicular to the clamping surface and in contact with the flange face 201. The suction port 113 is an opening located on this bottom surface.

[0047] In this embodiment, the injection device further includes a liquid suction assembly 30, which includes a second liquid storage component 31, a second pump, and a second connecting pipe. The gripper 11 is also provided with a liquid suction port 113, which is attached to the flange surface 201 and connected to the second pump through the second connecting pipe. When the loosening agent overflows, it flows along the surface of the bolt 100 to the flange surface 201. At this time, the liquid suction port 113 is attached to the flange surface 201. Under the suction force of the second pump, the overflowing loosening agent can be sucked and collected into the liquid suction port 113, and then flowed into the second liquid storage component 31 through the second connecting pipe. This can effectively reduce the risk of loosening agent spillage and environmental pollution. At the same time, the collected loosening agent can also be temporarily stored in the second liquid storage component 31 for subsequent recycling, which also helps to save costs.

[0048] In some embodiments, such as Figure 2 , Figure 4 and Figure 8 As shown, the suction port 113 is an arc-shaped opening that is adapted to the side wall of the bolt 100. At least one suction port 113 is provided on each of the opposite sides of the clamp 11. The suction ports 113 located on both sides of the clamp 11 can fit against the flange surface 201 from the opposite sides of the bolt 100.

[0049] In this embodiment, the suction port 113 is a strip-shaped opening with a certain length, and the strip-shaped opening is arc-shaped to match the side wall shape of the bolt 100. In this way, the arc-shaped opening and the arc-shaped opening have a larger contact area with the flange surface 201, so that the suction port 113 has a larger area for sucking up the overflowing loosening agent. Furthermore, at least one suction port 113 is provided on each side of the clamp 11, that is, on the opposite sides of the bolt 100. The suction ports 113 are distributed, and the suction ports 113 on both sides absorb the overflowing loosening agent from both sides of the bolt 100, thereby accelerating the collection of the overflowing loosening agent and further reducing the risk of loosening agent overflow and spillage.

[0050] The gripper 11 has at least one suction port 113 on each of its opposite sides. For example, the gripper 11 may have one suction port 113 on each side, or two suction ports 113 on each of its opposite sides. The number of suction ports 113 on each side of the gripper 11 may be equal or unequal.

[0051] In a specific embodiment, a suction port 113 is provided on each of the opposite sides of the gripper 11. The arc length of the suction port 113 on one side of the bolt 100 is approximately 90° to 120°. In this way, the two suction ports 113 on both sides can surround more than half of the space of the bolt 100 and provide an inlet for collecting the overflow loosening agent in the corresponding space.

[0052] In some embodiments, such as Figure 2 , Figure 4 and Figure 8 As shown, the gripper 11 is also provided with a liquid suction connector 14. One end of the liquid suction connector 14 is inserted into the gripper 11 and communicates with the liquid suction port 113. The other end of the liquid suction connector 14 is exposed outside the gripper 11 and is connected to the second connecting tube.

[0053] In this embodiment, a liquid suction connector 14 is provided on the gripper 11. Part of the liquid suction connector 14 is embedded in the gripper 11, for example, inserted into a preset channel or hole on the gripper 11, and communicates with the liquid suction port 113 on the gripper 11. The loosening agent collected by the liquid suction port 113 can enter the interior of the liquid suction connector 14 through this end. The other part of the liquid suction connector 14 protrudes from the surface of the gripper 11, forming an interface for connection with the second connecting tube. In this way, the connection of the second connecting tube is made more convenient by inserting the liquid suction connector 14 into the gripper 11 to connect the second connecting tube and the liquid suction port 113.

[0054] As an example, the liquid suction connector 14 can be inserted into the first half-claw 111 or the second half-claw 112 and communicate with the liquid suction port 113 provided on the corresponding first half-claw 111 or the second half-claw 112.

[0055] In some embodiments, such as Figures 2 to 4 As shown, the clamping assembly 10 also includes an operating arm 13, which is used to drive the gripper 11 to clamp or loosen the bolt 100. The liquid supply assembly 20 and / or the liquid suction assembly 30 are mounted on the operating arm 13.

[0056] In this embodiment, the gripper 11 is also connected to the operating arm 13. By operating the operating arm 13, the gripper 11 can be driven to move, thereby gripping or loosening the bolt 100. The liquid supply component 20 can be set on the operating arm 13, and the liquid suction component 30 can also be set on the operating arm 13. That is, the liquid supply component 20 and the liquid suction component 30 are integrated with the gripper 11 and moved together with the gripper 11. Compared with the dispersed setting, the liquid supply component 20 and the liquid suction component 30 can move synchronously with the operating arm 13. The first connecting pipe and the second connecting pipe will not be pulled, thereby ensuring the stable liquid supply of the first connecting pipe and the stable negative pressure suction of the second connecting pipe. At the same time, the operating arm 13 can also be set to be linked with industrial robotic arms, etc., to realize the full-process mechanized processing of bolt 100, which is especially suitable for batch bolt 100 processing scenarios.

[0057] As an example, the clamping assembly 10 may include two operating arms 13, which are respectively connected to the first half-jaw 111 and the second half-jaw 112 of the gripper 11. The operating arms 13 are used to drive the first half-jaw 111 and the second half-jaw 112 to move closer to each other or further away from each other. When it is necessary to clamp the bolt 100, the two operating arms 13 first drive the corresponding first half-jaw 111 and the second half-jaw 112 to open the first half-jaw 111 and the second half-jaw 112, so that the bolt 100 is inserted into the clamping space 110. Then the operating arms 13 drive the first half-jaw 111 and the second half-jaw 112 to close and clamp the bolt 100.

[0058] In some embodiments, such as Figure 2 , Figure 3 and Figure 7 As shown, the liquid supply assembly 20 is installed on an operating arm 13. For example, a first liquid storage unit 21 is installed on an operating arm 13, and a first pump 22 is installed inside the first liquid storage unit 21. The first liquid storage unit 21 is provided with a liquid outlet connector 211, and a first connecting pipe is connected to the liquid outlet connector 211. The first liquid storage unit 21 includes a housing 213, which includes a first part 2131 and a second part 2132. The first part 2131 and the second part 2132 are fastened together and enclosed to form a cavity 2130. The loosening agent and the first pump 22 are both contained in the cavity 2130. The liquid outlet connector 211 is provided in the first part 2131 or the second part 2132. Furthermore, the first part 2131 or the second part 2132 is also provided with a liquid inlet connector 212, through which the loosening agent can be injected into the cavity 2130 of the housing 213.

[0059] In some embodiments, the liquid suction assembly 30 may be installed on the same operating arm 13 as the liquid supply assembly 20, or the two may be installed on different operating arms 13. For example, the second liquid storage unit 31 and the first liquid storage unit 21 may be installed on the same operating arm 13, the second pump may be installed inside the second liquid storage unit 31, the second liquid storage unit 31 may be provided with a return liquid connector 311, and the second connecting pipe may be connected to the return liquid connector 311. The loosening agent flowing through the second connecting pipe may be injected into the second liquid storage unit 31 through the return liquid connector 311.

[0060] As an example, the second liquid reservoir 31 can be a transparent liquid reservoir bottle, etc., so that operators can easily observe the amount of loosening agent collected. As an example, the first pump 22 can be a plunger pump, driven by a DC brushed motor, with an external 12V charging port. The liquid supply flow rate of the first pump 22 can be adjusted using a motor speed control module. At the same time, the injection time of the loosening agent can be set by setting a time relay, so that a specified volume of loosening agent can be injected within a preset time. In this way, the amount of loosening agent required to wet the threads can be determined by calculation. When the liquid supply component 20 provides a sufficient amount of loosening agent, if there is no recovered loosening agent in the second liquid reservoir 31, it means that the current amount of loosening agent injected meets the wetting requirements. If there is recovered loosening agent in the second liquid reservoir 31, it means that the current amount of loosening agent injected does not meet the wetting requirements, and it is necessary to continue injecting loosening agent equal to the recovered amount. In this way, effective wetting of the threads can be achieved by dynamically detecting the amount of loosening agent injected.

[0061] In a specific embodiment, the operating arm 13 may also be provided with a handle 131, which is used for the operator to hold and facilitate operation.

[0062] Another embodiment of this application provides a bolt loosening agent adding device, which includes the bolt loosening agent injection device in the above embodiment, and a suction device, wherein the suction device is used to connect to the center hole of the bolt to suction air from the center hole.

[0063] Thus, in addition to using the injection device described in the above embodiments to inject loosening agent into the gap between the bolt and the threaded hole, a suction device can also be set up to extract air at the center hole of the bolt, so that the center hole forms a negative pressure. The center hole is connected to the threaded hole, and the loosening agent can be accelerated to penetrate downward under the action of negative pressure, thereby improving the penetration speed and efficiency of the loosening agent.

[0064] In a specific embodiment, the suction device may include a vacuum pump, a third connecting pipe, and a suction head. The suction head can be quickly inserted into the center hole of the bolt. The third connecting pipe connects the suction head and the vacuum pump. By starting the vacuum pump, the air in the center hole is extracted, creating a negative pressure in the center hole to accelerate the flow of the loosening agent into the bolt hole.

[0065] Please refer to the following: Figures 1 to 8 By comparing the method of pouring and injecting loosening agent into the center hole 102 of bolt 100 in related technologies, the effects of the bolt loosening agent injection device of the above embodiments of this application will be explained in conjunction with specific examples.

[0066] In the method of injecting loosening agent into the center hole 102 of bolt 100, the loosening agent is poured from the container nozzle into the adapter at the top of the center hole 102 of bolt 100. The loosening agent flows from the gap between the center hole 102 of bolt 100 and the mandrel to the plug at the bottom of bolt 100. The flow process needs to pass through the gaps between the two central rings and the center hole 102, and then flow from the small hole on the plug to the bottom of the threaded hole 101. As the loosening agent is continuously poured into the center hole 102, more and more loosening agent flows into the bottom of the threaded hole 101. When the loosening agent fills the space between the bottom of bolt 100 and the bottom of threaded hole 101, the liquid level of the loosening agent gradually rises to fill the mating gap between the threads of bolt 100 and threaded hole 101, thereby achieving the purpose of wetting the threads.

[0067] In this scheme, to ensure that all threads engaging with the screw hole 101 are wetted, according to the principle of communicating vessels, the liquid level of the loosening agent in the central hole 102 needs to be consistent with the liquid level in the gap between the bolt 100 and the screw hole 101. Therefore, to achieve effective wetting, the amount of loosening agent required is at least the sum of the volumes of the following three locations: the gap between the bolt 100 and the screw hole 101, the gap between the central hole 102 of the bolt 100 and the mandrel, and the gap between the non-engaging parts at the bottom of the bolt 100 and the screw hole 101. Taking the CPR1000 unit as an example, calculations show that approximately 295 mL of loosening agent needs to be injected into each screw hole 101.

[0068] On the other hand, because the flow area at the central ring of the core rod and the flow area at the plug orifice are relatively small, and the loosening agent injected from the top of the central hole 102 must pass through the gaps between two central rings to reach the plug orifice, if the injection speed of the loosening agent is too fast and much greater than the outflow speed through the gaps in the central hole 102, then when the liquid level in the central hole 102 reaches the adapter pin hole, the actual volume of loosening agent in the central hole 102 may still be much smaller than the actual volume of loosening agent required for the main bolt hole 101. At this point, workers often misjudge the amount of loosening agent injected, resulting in insufficient injection. Therefore, in this scheme, a slow, multi-stage injection method must be adopted, which undoubtedly increases the operation time. Taking the CPR1000 unit as an example, based on empirical calculations, achieving effective wetting of bolt 100 and completing the loosening agent injection takes approximately 1 hour.

[0069] In contrast, when using the bolt loosening agent injection device provided in this embodiment, the loosening agent is directly injected into the gap between the bolt 100 and the screw hole 101 through the outlet of the injection connector 12. The amount of loosening agent injected is the volume of the gap space between the bolt 100 and the screw hole 101, without needing to consider the gap between the center hole 102 and the core rod, or the gap of the non-engaging part at the bottom of the screw hole 101. Therefore, the amount of loosening agent used can be greatly reduced. At the same time, the loosening agent flows directly into the gap between the bolt 100 and the screw hole 101, and the flow is also greatly shortened, thus effectively saving the injection time of the loosening agent. Taking the CPR1000 unit as an example, calculations show that only 15 mL of loosening agent needs to be injected into each screw hole 101, and the time required to complete the injection is approximately 15 minutes.

[0070] In summary, compared with the related art method of directly injecting loosening agent through the center hole 102, the bolt loosening agent injection device provided in this application embodiment has at least the following advantages: 1) The loosening agent is injected directly into the gap between the bolt 100 and the screw hole 101, which greatly reduces the amount of loosening agent used. The amount injected into a single screw hole 101 is reduced from 295mL to 15mL. 2) The single injection time of loosening agent in a single screw hole 101 is reduced from 1 hour to 15 minutes, which shortens the operation time, improves the work efficiency, and at the same time, effectively reduces the radiation dose to the workers. 3) Injecting the loosening agent directly into the gap between the bolt 100 and the threaded hole 101 ensures sufficient thread lubrication. However, injecting the loosening agent into the center hole 102 may prevent the lubricant from flowing into the gap between the bolt 100 and the threaded hole 101 if the internal flow channel of the bolt 100 is blocked, thus failing to achieve effective lubrication. For example, if the mandrel plug of the bolt 100 is blocked, the loosening agent cannot flow into the gap between the bolt 100 and the threaded hole 101 at all.

[0071] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0072] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A bolt loosening agent injection device characterized by comprising: The injection device comprises a clamping assembly and a liquid supply assembly. The clamping assembly comprises a clamping jaw and a liquid injection connector arranged on the clamping jaw. The clamping jaw is used to fit the side wall of a bolt. The liquid injection connector has a liquid outlet which protrudes from the clamping jaw and can be used to contact the side wall of the bolt. The liquid supply assembly comprises a first liquid storage member, a first pump and a first connecting pipe. The first liquid storage member is used to store a loosening agent. The first connecting pipe connects the liquid injection connector and the first liquid storage member. The first pump is connected to the first connecting pipe and is used to deliver the loosening agent in the first liquid storage member to the liquid outlet of the liquid injection connector.

2. The injection device for bolt loosening agent according to claim 1, wherein The clamping jaw comprises a first clamping half and a second clamping half which are connected and can be opened and closed. The first clamping half and the second clamping half form a clamping space for inserting the bolt. At least one of the first clamping half and the second clamping half is provided with the liquid injection connector. The liquid outlet of the liquid injection connector extends into the clamping space.

3. The injection device for bolt loosening agent according to claim 2, wherein The first clamping half has a first clamping surface facing the second clamping half. The second clamping half has a second clamping surface facing the first clamping half. The first clamping surface and the second clamping surface are concave surfaces which are adapted to the side wall of the bolt. The clamping space is a circular space between the first clamping surface and the second clamping surface. The liquid outlet of the liquid injection connector protrudes from the corresponding first clamping surface or second clamping surface along the radial direction of the clamping space.

4. The injection device for bolt loosening agent according to claim 2, wherein The clamping assembly comprises a plurality of liquid injection connectors. The first clamping half and the second clamping half are respectively provided with a plurality of liquid injection connectors. Each liquid injection connector is uniformly and spacedly arranged along the circumferential direction of the clamping space.

5. The injection device for bolt loosening agent according to claim 3, wherein The first clamping surface is provided with a first protruding portion which protrudes towards the circular space. The second clamping surface is provided with a second protruding portion which protrudes towards the circular space. The protruding distance of the first protruding portion from the first clamping surface is equal to the protruding distance of the liquid injection connector from the first clamping surface. The protruding distance of the second protruding portion from the second clamping surface is equal to the protruding distance of the liquid injection connector from the second clamping surface. The first protruding portion and the second protruding portion are used to abut the side wall of the bolt.

6. The injection device for bolt loosening agent according to any one of claims 1 to 5, wherein The injection device further comprises a liquid suction assembly. The clamping jaw is further provided with a liquid suction port which is used to fit a flange surface of the bolt which is perpendicular to the bolt. The liquid suction assembly comprises a second liquid storage member, a second pump and a second connecting pipe. The second connecting pipe connects the liquid suction port and the second liquid storage member. The second pump is connected to the second connecting pipe and is used to suck the loosening agent flowing onto the flange surface into the second liquid storage member.

7. The injection device for bolt loosening agent according to claim 6, wherein The liquid suction port is an arc-shaped port which is adapted to the shape of the side wall of the bolt. Opposite sides of the clamping jaw are respectively provided with at least one liquid suction port. The liquid suction ports on the opposite sides of the clamping jaw can fit the flange surface from the opposite sides of the bolt.

8. The injection device for bolt loosening agent according to claim 6, wherein The clamping jaw is further provided with a liquid suction connector. One end of the liquid suction connector is inserted into the clamping jaw and communicates with the liquid suction port. The other end of the liquid suction connector is exposed from the clamping jaw and is connected to the second connecting pipe.

9. The injection device for bolt loosening agent as set forth in claim 6, wherein The clamping assembly further comprises an operating arm for driving the clamping jaw to clamp or release the bolt, and the liquid supplying assembly and the liquid sucking assembly are both mounted on the operating arm.

10. A bolt loosening agent adding apparatus characterized by comprising: The injection device comprises a bolt loosening agent as claimed in any one of claims 1 to 9, and a suction device for connecting to the central hole of the bolt to suck the air in the central hole.

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