A nuclear power plant ventilation duct isolation damper pulling tool

Abstract

The utility model discloses a kind of nuclear power plant ventilation pipeline isolation gate pull tool, including operating lever assembly and clamping head, the clamping head with the operating lever assembly one end fixed connection;The clamping head includes first clamping plate, second clamping plate and clamping plate, the first clamping plate with the second clamping plate opposite arrangement and with the operating lever assembly one end direct or indirect fixed connection, and form the clamping head for accommodating gate angle steel bayonet;The clamping plate with the second clamping plate connection, and extend to the direction of the first clamping plate.When using, clamping head is inserted into gate angle steel and rotates engagement, with second clamping plate as fulcrum, first clamping plate is opened with clamping plate lever principle to pry gate seal strip, balance the pressure difference inside and outside ventilation pipeline, then horizontal gate pull can be safely removed gate.The function of single person safety, labor saving and fast removal gate is realized, which is safe and efficient, labor saving and reliable, and simple in structure, and has strong applicability.

Description

Technical Field

[0001] This utility model relates to the technical field of maintenance tools for nuclear power plant ventilation systems, and in particular to a tool for pulling out isolation gates of nuclear power plant ventilation ducts. Background Technology

[0002] To ensure adequate cooling, dehumidification, and insulation for equipment during daily operation and major overhauls of the nuclear power plant, and to guarantee a comfortable working environment for staff and maintenance personnel, numerous ventilation systems are distributed throughout the plant buildings. Regular maintenance is scheduled to ensure the reliable operation of these systems. During maintenance, it is crucial to maintain plant temperature control. Therefore, ventilation systems in certain critical equipment rooms are operated without interruption, with maintenance only conducted at the isolated maintenance points. This isolation requires the use of specially designed isolation gates with sealing strips, inserted into the ductwork to achieve isolation and ensure a normal pressure environment at the isolated points, thus meeting the conditions for maintenance.

[0003] After maintenance, the isolation damper needs to be removed from the duct. Because the system fan is running, the damper is tightly adhered to the duct wall due to negative pressure and the sealing strip, making removal extremely difficult. Currently, there are generally two methods for removing the damper:

[0004] One method involves shutting down the entire ventilation system and removing the gate without negative pressure. However, this method has extremely strict requirements on operation time, and historically, there have been instances where excessively long operation times have led to abnormally high temperatures in rooms containing critical equipment, posing a significant risk.

[0005] Another method involves multiple people working together. One person uses their fingers and wrists to pull the gate in the opposite direction of the sealing strip, creating a gap to balance the pressure between the environment and the duct. Two other people then work together to pull the gate out horizontally. This method requires extremely strong hand strength from the personnel balancing the pressure, and because the hand position is limited and very close to the point where the gate contacts the duct, there is a risk of finger injuries. It is inefficient and unsafe. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a tool for pulling out the isolation gate of the ventilation duct in a nuclear power plant.

[0007] The technical solution adopted by this utility model to solve its technical problem is as follows: a tool for pulling out isolation gates in ventilation ducts of nuclear power plants is constructed, including an operating rod assembly and a clamping head. The clamping head is fixedly connected to one end of the operating rod assembly. The clamping head includes a first clamping plate, a second clamping plate, and a locking plate. The first clamping plate and the second clamping plate are arranged opposite to each other and are both directly or indirectly fixedly connected to one end of the operating rod assembly, forming a slot for accommodating the gate angle steel. The locking plate is connected to the second clamping plate and extends in the direction of the first clamping plate.

[0008] Furthermore, the second clamping plate is provided with an outwardly protruding edge, which is located on the side of the second clamping plate close to the first clamping plate.

[0009] Furthermore, the length of the first clamping plate along the axial direction of the operating lever assembly is greater than the length of the second clamping plate along the axial direction of the operating lever assembly.

[0010] Furthermore, it also includes a connecting block, through which the operating lever assembly is fixedly connected to the clamping head, and both the first clamping plate and the second clamping plate are connected to the connecting block.

[0011] Furthermore, it also includes reinforcing ribs, which are fixedly connected to the connecting block and the operating lever assembly, respectively.

[0012] Furthermore, the operating lever assembly includes a long lever and a handle. One end of the long lever is directly or indirectly fixedly connected to both the first clamping plate and the second clamping plate, and the handle is connected to the end of the long lever away from the clamping head.

[0013] Furthermore, the handle is a straight rod-shaped, triangular, or polygonal frame structure.

[0014] Furthermore, the surface of the card plate is perpendicular to the surface of the second clamping plate.

[0015] Furthermore, the gap width between the first clamping plate and the second clamping plate is equal to or slightly greater than the thickness of the gate angle steel.

[0016] Furthermore, the isolation gate pull tool for the nuclear power plant ventilation duct is made of metal material, and the components are welded together as a single unit.

[0017] By implementing this utility model, the following beneficial effects can be achieved:

[0018] This utility model relates to a tool for pulling out isolation gates in nuclear power plant ventilation ducts. It uses a specially designed clamping head to reliably engage with the gate's angle steel and leverages the lever principle to pry open the sealing strip to balance the pressure difference. This avoids the risk of pinching injuries caused by manual operation, enables safe operation by a single person, and significantly improves work efficiency. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0020] Figure 1 This is a three-dimensional structural schematic diagram of a nuclear power plant ventilation duct isolation gate pull-out tool according to an embodiment of the present invention;

[0021] Figure 2 yes Figure 1Enlarged structural diagram of structure A in the middle;

[0022] Figure 3 yes Figure 1 Side view of the isolation gate pull-out tool for ventilation ducts in a China National Nuclear Corporation (CNNC) power plant;

[0023] Figure 4 This is a side view of a nuclear power plant ventilation duct isolation gate pull-out tool according to another embodiment of the present invention. Detailed Implementation

[0024] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0026] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the tool or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a chemical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] See Figures 1 to 4One embodiment of this utility model discloses a tool for pulling and retracting an isolation gate in a nuclear power plant ventilation duct, including an operating lever assembly and a clamping head, wherein the clamping head is fixedly connected to one end of the operating lever assembly. The operating lever assembly serves as the main lever arm. In use, the operator, by manipulating the operating lever assembly, utilizes the lever principle to convert a relatively small hand force into a larger prying force acting on the edge of the gate. The clamping head is used to reliably grip and lock onto the angle steel of the gate, serving as the connection interface between the tool and the gate, ensuring that the tool does not detach from the gate during prying and pulling.

[0029] like Figure 2 As shown, the clamping head includes a first clamping plate 3, a second clamping plate 4, and a locking plate 5. The first clamping plate 3 and the second clamping plate 4 are arranged opposite to each other and are directly or indirectly fixedly connected to one end of the operating rod assembly, forming a slot for accommodating the angle steel of the gate. The locking plate 5 is connected to the second clamping plate 4 and extends towards the first clamping plate 3. The first clamping plate 3 and the second clamping plate 4 can clamp the angle steel of the gate from both sides. In use, the operator aligns the slot and inserts the angle steel. The locking plate 5 and the second clamping plate 4 together form an L-shaped or hook-shaped structure. After the tool is inserted into the angle steel, rotating the tool by a certain angle, such as 90°, allows the locking plate 5 to hook onto the edge of the angle steel, preventing the tool from slipping off the angle steel when under force. This is a key component for achieving reliable locking. Preferably, the surface of the locking plate 5 is perpendicular to the surface of the second clamping plate 4.

[0030] This invention solves the problems of difficult, high-risk, and low-efficiency removal of isolation gates in negative pressure environments where ventilation systems are constantly running. It utilizes a specially designed clamping head that reliably engages with the gate's angle steel, and leverages the principle to pry open the sealing strip to balance the pressure difference. This avoids the risk of pinching injuries from manual operation, enabling safe single-person operation and significantly improving work efficiency. The design is simple, highly adaptable, compact, and easy to manufacture. It can be adapted to different sizes of gate angle steel, exhibiting excellent versatility.

[0031] Furthermore, such as Figure 1 , Figure 3 and Figure 4 As shown, in some embodiments, the operating lever assembly includes a long lever 1 and a handle 8. One end of the long lever 1 is directly or indirectly fixedly connected to both the first clamping plate 3 and the second clamping plate 4, and the handle 8 is connected to the end of the long lever 1 away from the clamping head. The long lever 1, as the main lever arm, is preferably made of a high-strength metal tube.

[0032] Furthermore, such as Figure 3 and Figure 4 As shown, in some embodiments, the handle 8 is a straight rod, triangular, or polygonal frame structure. The handle 8 is attached to the end of the long rod 1 and can be straight, triangular, or other shapes that are easy to grip, in order to facilitate the application of force.

[0033] Furthermore, such as Figure 2 As shown, in some embodiments, the second clamping plate 4 has an outwardly protruding edge 7, which is located on the side of the second clamping plate 4 closest to the first clamping plate 3. The protruding edge 7 serves as a fulcrum in the lever principle. In use, the protruding edge 7 needs to abut against the opening edge of the air duct or the back of the gate. When the operating lever assembly is pressed down, the fulcrum provides a reaction force, causing the clamping head to lift the sealing edge of the gate, thereby breaking the seal and balancing the pressure difference.

[0034] Furthermore, such as Figure 2 As shown, in some embodiments, the length of the first clamping plate 3 along the axial direction of the operating rod assembly is greater than the length of the second clamping plate 4 along the axial direction of the operating rod assembly. This ensures that the clamping plate 5 can rotate smoothly and hook onto the angle steel, while also assisting in achieving rapid alignment and preventing misoperation.

[0035] Furthermore, such as Figure 2 As shown, in some embodiments, the gap width between the first clamping plate 3 and the second clamping plate 4 is equal to or slightly greater than the thickness of the gate angle steel. This ensures that the tool can be smoothly fitted into the angle steel, while also preventing excessive play after rotational engagement, thus guaranteeing the stability and effectiveness of the operation.

[0036] Furthermore, such as Figure 1 , Figure 3 and Figure 4 As shown, in some embodiments, the nuclear power plant ventilation duct isolation gate pull-out tool further includes a connecting block 2. The operating lever assembly is fixedly connected to the clamping head via the connecting block 2, and both the first clamping plate 3 and the second clamping plate 4 are connected to the connecting block 2. The connecting block 2 serves as a connecting transition between the operating lever assembly and the clamping head. It provides sufficient space and structural foundation for securely installing the first clamping plate 3 and the second clamping plate 4, and optimizes the force transmission path.

[0037] The first clamping plate 3 and the second clamping plate 4 are fixed to the connecting block 2 in parallel relative to each other, or the first clamping plate 3 and the second clamping plate 4 are slightly inclined to the outside, forming a gap between them with a width slightly greater than the thickness of the gate angle steel. The cross-section of the gap is square or trumpet-shaped.

[0038] Furthermore, such as Figure 1 , Figure 3 and Figure 4 As shown, in some embodiments, the nuclear power plant ventilation duct isolation gate pull-out tool further includes reinforcing ribs 6, which are fixedly connected to the connecting block 2 and the operating rod assembly, respectively. The reinforcing ribs 6 enhance the structural strength of the connection between the connecting block 2 and the operating rod assembly, preventing bending or breakage of this part under lever stress, thus ensuring the safety and durability of the tool.

[0039] Furthermore, the isolation gate pull-out tool for the nuclear power plant ventilation duct is made of metal, and all components are welded together as a single unit. This ensures that the entire tool has sufficient strength and rigidity to withstand the enormous stress generated during lever operation. The welded-in-place structure guarantees overall stability and reliability.

[0040] The method of using the nuclear power plant ventilation duct isolation gate pull-out tool of this utility model is as follows:

[0041] In use, the operator inserts the clamping head into the angle steel of the gate, positioning the angle steel between the first clamping plate 3 and the second clamping plate 4. Then, the entire tool is rotated approximately 90 degrees, at which point the clamping plate 5 engages below the edge of the angle steel, achieving a reliable lock. Next, using the convex edge 7 against the duct opening or the back of the gate as a fulcrum, the operator grips the handle 8 and pulls the long rod 1 in the opposite direction to the sealing strip. Utilizing the lever principle, a gap can be easily pried open between the gate's sealing strip and the inner wall of the duct, allowing the internal and external pressures to quickly balance. After the pressure difference is balanced, continuing to utilize the engagement between the clamping plate 5 and the angle steel, the operator pulls the operating rod assembly horizontally backward to smoothly remove the gate. Once the sealing part of the gate is completely detached from the duct, it can be completely removed by hand.

[0042] By implementing this utility model, the following beneficial effects can be achieved:

[0043] This utility model discloses a tool for pulling out isolation gates in nuclear power plant ventilation ducts. The clamping head quickly engages with the gate's angle steel. Using the convex edge 7 as a fulcrum, the long rod 1 applies leverage to easily pry open the sealing strip to balance the pressure difference. Finally, the gate can be removed by horizontal pulling. The entire process is labor-saving and safe, effectively avoiding the risks of manual operation and enabling efficient single-person operation. Using the long rod 1 as the lever arm and the convex edge 7 as the fulcrum, it can easily overcome negative pressure and the suction force of the sealing strip, solving the problems of laborious and unreliable manual operation.

[0044] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, without departing from the concept of the present utility model, the above embodiments or technical features can be freely combined, and several modifications and improvements can be made. These all fall within the protection scope of the present utility model, that is, the embodiments described "in some embodiments" can be freely combined with any of the embodiments above and below. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A tool for pulling out isolation gates in ventilation ducts of nuclear power plants, characterized in that, It includes an operating lever assembly and a clamping head, wherein the clamping head is fixedly connected to one end of the operating lever assembly; The clamping head includes a first clamping plate (3), a second clamping plate (4), and a clamping plate (5). The first clamping plate (3) and the second clamping plate (4) are arranged opposite to each other and are directly or indirectly fixedly connected to one end of the operating rod assembly, forming a bayonet for accommodating the gate angle steel. The clamping plate (5) is connected to the second clamping plate (4) and extends in the direction of the first clamping plate (3).

2. The nuclear power plant ventilation duct isolation gate pull-out tool according to claim 1, characterized in that, The second clamping plate (4) is provided with an outwardly protruding edge (7), which is located on the side of the second clamping plate (4) close to the first clamping plate (3).

3. The nuclear power plant ventilation duct isolation gate pull-out tool according to claim 1, characterized in that, The length of the first clamping plate (3) along the axial direction of the operating lever assembly is greater than the length of the second clamping plate (4) along the axial direction of the operating lever assembly.

4. The nuclear power plant ventilation duct isolation gate pull-out tool according to claim 1, characterized in that, It also includes a connecting block (2), the operating lever assembly is fixedly connected to the clamping head through the connecting block (2), and the first clamping plate (3) and the second clamping plate (4) are both connected to the connecting block (2).

5. The nuclear power plant ventilation duct isolation gate pull-out tool according to claim 4, characterized in that, It also includes a reinforcing rib (6), which is fixedly connected to the connecting block (2) and the operating lever assembly respectively.

6. The nuclear power plant ventilation duct isolation gate pull-out tool according to claim 1, characterized in that, The operating lever assembly includes a long rod (1) and a handle (8). One end of the long rod (1) is directly or indirectly fixedly connected to the first clamping plate (3) and the second clamping plate (4). The handle (8) is connected to the end of the long rod (1) away from the clamping head.

7. The nuclear power plant ventilation duct isolation gate pull-out tool according to claim 6, characterized in that, The handle (8) is a straight rod-shaped, triangular, or polygonal frame structure.

8. The nuclear power plant ventilation duct isolation gate pull-out tool according to claim 1, characterized in that, The surface of the card plate (5) is perpendicular to the surface of the second clamping plate (4).

9. The nuclear power plant ventilation duct isolation gate pull-out tool according to claim 1, characterized in that, The gap width between the first clamping plate (3) and the second clamping plate (4) is equal to or slightly greater than the thickness of the gate angle steel.

10. The nuclear power plant ventilation duct isolation gate pull-out tool according to any one of claims 1 to 9, characterized in that, The isolation gate pull tool for the nuclear power plant ventilation duct is made of metal, and all components are welded together as a single unit.

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