A nuclear power rotary grid trash cleaner's rope-like foreign matter electric cutting mechanism

Abstract

The utility model discloses a nuclear power rotary type grating trash cleaning machine's rope -like foreign matter electric cutting mechanism relates to the technical field of trash cleaning machine. The installation subassembly includes the installation support, the turnover shaft and the turnover motor, and the installation support is fixed on the both sides support of the grating ascending section of trash cleaning machine, the turnover shaft is connected with the installation support rotation, and its one end is connected with the turnover motor gear on the installation support, the cutting subassembly includes the cutting base, the fixed blade, the movable blade and the drive motor, fixes on the turnover shaft and sets up along the turnover shaft axial direction, the fixed blade solidly links on the cutting base one end away from the turnover shaft, the movable blade is slid with the fixed blade and cooperates, and the drive motor is located on the cutting base and drives the movable blade to reciprocate relative to the fixed blade, forms the shearing cooperation, and the anti -collision pole is fixed in the cutting base bottom end one end, and along trash cleaning machine extends. The utility model discloses to solve the existing trash cleaning machine and causes the problem of jamming failure of rope -like foreign matter winding, realizes the quick cutting of non -stop machine and removes the foreign matter.

Description

Technical Field

[0001] This utility model belongs to the field of cleaning machine technology, and specifically relates to a rope-shaped foreign object electric cutting mechanism for a nuclear power plant rotary bar screen cleaning machine. Background Technology

[0002] Rotary bar screen cleaners are key equipment in the circulating water filtration system of nuclear power plants, used to intercept and remove suspended solids in the water flow to ensure the safe operation of the unit. In actual operation, the equipment often malfunctions due to rope-like foreign objects (such as plastic woven belts, hemp ropes, and aquatic plants) flowing in from upstream. These flexible foreign objects easily become entangled in the scraper buckets or chains of the cleaner. Especially when part of the entangled object is carried upwards by the scraper bucket and redundantly suspended or wrapped in the area between adjacent scraper buckets, it will seriously hinder the normal operation of the scraper buckets, leading to equipment jamming, abnormal chain tension, or even overload of the drive motor. For foreign objects tightly wrapped in narrow parts such as chain hinges, shutdown and handling are still required. Utility Model Content

[0003] The purpose of this invention is to overcome the above-mentioned defects and propose an electric cutting mechanism for rope-shaped foreign objects in a nuclear power plant rotary bar screen cleaner. This mechanism solves the problem of jamming caused by rope-shaped foreign objects entanglement in existing screen cleaners, enabling rapid cutting and removal of foreign objects without stopping the machine, and ensuring continuous and stable operation of the equipment.

[0004] The specific technical solution is as follows: A rope-shaped foreign object electric cutting mechanism for a nuclear power plant rotary bar screen cleaner includes: The mounting components include a mounting bracket, a tilting shaft, and a tilting motor. The mounting bracket is fixed to the two side supports of the screen lifting section of the screen cleaner. The tilting shaft is rotatably connected to the mounting bracket, and one end of the shaft is connected to the tilting motor gear on the mounting bracket. The cutting assembly includes a cutting base, a fixed blade, a movable blade, and a drive motor. It is fixed on a rotating shaft and arranged axially along the rotating shaft. The fixed blade is fixedly connected to the cutting base at one end away from the rotating shaft. The movable blade is slidably engaged with the fixed blade. The drive motor is located on the cutting base and drives the movable blade to reciprocate relative to the fixed blade, forming a shearing engagement. The anti-collision bar is fixed at one end to the bottom of the cutting base and extends along the cleaning machine. A pressure sensor is provided on the anti-collision bar at the corresponding position of the cutting base. The controller is electrically connected to the tilting motor and the drive motor respectively. It can control the tilting motor to rotate forward and reverse, so as to drive the cutting component to rotate and cut into or out of the area between the upper and lower adjacent rake buckets of the cleaning machine. It can also control the tilting motor to drive the cutting component to rotate upward according to the pressure sensor.

[0005] Preferably, the cutting edge of the fixed blade is composed of multiple toothed openings spaced apart along the length of the fixed blade, the fixed blade is balanced with the cutting base, and the toothed openings have a trumpet-shaped layout that is wider on the outside and narrower on the inside.

[0006] Preferably, the tooth pitch of the toothed opening of the fixed blade is 50-80mm, the tooth depth is 40-80mm, and the tooth shape of the movable blade is adapted to the toothed opening of the fixed blade.

[0007] Preferably, the drive motor is connected to the movable blade via a reciprocating assembly. The reciprocating assembly includes a crank and a horizontal roller. One end of the crank is fixed to the output shaft of the drive motor, and the other end is used to rotate and fix the horizontal roller. The horizontal roller is fitted into an oblong slot on the movable blade. The width of the horizontal roller and the oblong slot are the same. The oblong slot is located in the middle of the movable blade and is perpendicular to its length direction.

[0008] Preferably, the reciprocating frequency of the movable blade is 150-200 times / minute, and the stroke is 50-80mm.

[0009] Preferably, two sets of anti-collision bars are provided, located on both sides of the bottom end of the cutting base.

[0010] Preferably, the flipping motor is connected to the flipping shaft via gears.

[0011] Preferably, both the fixed blade and the movable blade are made of cemented carbide, and the tips of the teeth are blunted.

[0012] Preferably, the movable blade is provided with sliding rods at both ends, and the sliding rods are connected to the cutting base sliding sleeve to restrict the linear horizontal sliding of the movable blade.

[0013] Preferably, it also includes a grating sensor, which is disposed between the mounting supports and located below the flip axis, and the grating sensor is connected.

[0014] Compared with existing technologies, the beneficial effects of this utility model are as follows: When the cleaning machine becomes stuck due to rope-like foreign objects, this invention eliminates the need to drain the circulating water channel; the foreign objects can be removed online by activating an electric cutting mechanism. This fundamentally avoids the significant economic losses caused by load reduction or shutdown of nuclear power units due to handling such faults, greatly improving the continuity and reliability of power plant operation.

[0015] This utility model's toothed adapter cutting system achieves efficient and precise cutting. The fixed blade's flared toothed opening, wider on the outside and narrower on the inside, precisely matches the tooth shape of the movable blade. Combined with a reciprocating frequency of 150-200 times / minute and a tooth pitch and stroke design of 50-80mm, it can actively guide and gather rope-like foreign objects and quickly cut foreign objects of the appropriate diameter. Furthermore, the structure arranged along the axial direction of the flipping axis covers the length direction between the buckets, reducing jamming and ensuring thorough cutting. Secondly, a multi-dimensional safety protection structure ensures high-safety operation. Double-sided anti-collision bars, combined with pressure sensors, eliminate collision detection blind spots. Upon triggering, the controller can quickly drive the cutting components to flip upwards to avoid collisions, and a grating sensor accurately detects the flipping position. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model; Figure 2 This is a schematic diagram of the connection structure between the flip motor and the flip shaft; Figure 3 This is a schematic diagram of the moving blade drive structure; Figure 4 This is a schematic diagram of the control module.

[0017] In the attached diagram, 1-mounting support, 2-tilting shaft, 3-tilting motor, 4-cutting base, 5-fixed blade, 6-moving blade, 7-drive motor, 8-elongated slot, 9-horizontal roller, 10-crank, 11-anti-collision bar, 12-bracket, 13-rake bucket. Detailed Implementation

[0018] The embodiments of the utility model are further described in detail below with reference to the accompanying drawings, so that the purpose, technical solution and technical effect of the utility model can be more clearly presented.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "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 device 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," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] This utility model utilizes a rotary bar screen cleaner for the circulating water filtration system of a nuclear power plant unit. Each row of drum-type filter screens in the circulating water filtration system has two inlet channels, and each inlet channel is equipped with one rotary bar screen cleaner to intercept and remove suspended debris from the water flow. Two units are equipped with a total of eight rotary bar screen cleaners. The basic structure of the rotary bar screen cleaner mainly includes a frame, a drive system, a closed rotary working chain, and multiple rakes installed at certain intervals on the chain. In this application, a rake is installed every 2.88 to 3.2 meters on the working chain, for a total of 12 rakes, forming a continuous cleaning cycle. The rakes move under the traction of the chain, responsible for scooping up and removing various debris intercepted by the bar screen.

[0021] In nuclear power plant circulating water systems, flexible rope-like foreign objects such as plastic woven belts, hemp ropes, and aquatic plants can easily get mixed in. After being intercepted by the grid, these objects are easily caught by the rotating rake buckets. A typical failure mode is that one end of the foreign object gets caught on the rake teeth, while the longer portion hangs down or becomes entangled in the open area between the subsequently rising adjacent rake buckets, creating an obstruction and causing jamming. The cutting mechanism of this invention is mainly aimed at such suspended foreign objects already exposed in the operable area between the rake buckets, achieving non-stop cleaning. For foreign objects tightly wrapped around hidden parts such as chain hinges, existing anti-entanglement devices can be used in conjunction to solve the problem, which will not be elaborated here.

[0022] like Figures 1 to 4 As shown, this utility model provides a rope-shaped foreign object electric cutting mechanism specifically for this cleaning machine, which can automatically and accurately cut into the empty area between adjacent rake buckets 13 to cut the entangled object in situ, and ensure that it does not interfere with the moving rake buckets 13 throughout the entire operation. Figure 1 As shown, the mechanism is generally composed of installation components, cutting components, anti-collision components, and a controller working together.

[0023] The mounting components are fixed to the brackets 12 on both sides of the upper section of the screen of the cleaning machine, serving as the support and tilting base for the entire mechanism. They include mounting supports 1, a tilting shaft 2, and a tilting motor 3. The tilting motor 3 can drive the tilting shaft 2 to rotate forward and backward within a certain angle.

[0024] The cutting assembly is the core component that performs the shearing function. It is fixedly mounted on the rotating shaft 2 via the cutting base 4 and rotates together with the rotating shaft 2. The cutting assembly includes a fixed blade 5, a movable blade 6, and a drive motor 7. The fixed blade 5 is fixed to the front end of the cutting base 4. The movable blade 6 slides with the fixed blade 5 via a sliding pair and is driven by the drive motor 7 through a crank-slider mechanism, achieving high-speed reciprocating motion relative to the fixed blade 5, thus forming the shearing action.

[0025] The anti-collision assembly mainly includes an anti-collision rod 11 and a pressure sensor integrated thereon. One end of the anti-collision rod 11 is fixed to the bottom of the cutting base 4, and its length extends downward. It is used to detect obstacles in the path, such as the rake bucket 13, when the cutting assembly flips and cuts into the working area.

[0026] The controller, acting as the central control unit, is electrically connected to the tilting motor 3, the drive motor 7, and the pressure sensor on the anti-collision bar. First, it controls the tilting motor 3 to rotate the cutting assembly, causing it to tilt and cut into or out of the working area between adjacent rake buckets 13 of the cleaning machine. Second, after the cutting assembly reaches the working position, it starts the drive motor 7 to perform the cutting operation. Finally, and crucially, it receives signals from the pressure sensor in real time. If a preset threshold is exceeded, indicating a potential collision risk, it immediately controls the cutting assembly to tilt upwards to avoid the collision, ensuring equipment safety.

[0027] Through the coordinated operation of the above four components, this invention enables the automatic, safe, and efficient removal of tangled rope-like foreign objects without stopping the cleaning machine.

[0028] like Figures 1-3 As shown, in implementation, the mounting components serve as the support and foundation for the entire mechanism's operation. Mounting supports 1 are fixed to the two side brackets 12 of the screen's rising section using high-strength bolts, ensuring stable installation; connecting ends are provided at the upper and lower ends of mounting supports 1. The tilting shaft 2 spans the two side brackets and is rotatably connected to the mounting supports 1 via high-load rolling bearings. The tilting motor 3 is fixed to one of the mounting supports 1, and its output shaft is connected to one end of the tilting shaft 2 via a gear transmission mechanism, thereby converting the motor's rotational motion into the reciprocating oscillating motion of the tilting shaft. The tilting motor 3 is preferably a servo motor or stepper motor with braking function.

[0029] like Figure 1 and Figure 3As shown, in implementation, the cutting assembly is the core component for performing the shearing function. It is fixedly mounted on the tilting shaft 2 and arranged horizontally along the axial direction of the tilting shaft 2. The width of the portion of the cutting assembly that performs the shearing function should cover the width of the open area between adjacent rake buckets 13; and the cutting assembly should be able to cut into the open area between adjacent rake buckets 13 during tilting to complete the shearing. The cutting base 4 is a rigid frame structure welded from high-strength steel plates, its root fixed to the tilting shaft 2 via a flange, or directly welded. The fixed blade 5 is bolted to the cutting base 4 at the end away from the tilting shaft 2, employing a detachable structure for easy parts replacement and maintenance. The movable blade 6 is arranged side-by-side with the fixed blade 5, forming a close sliding fit. The drive motor 7 is mounted on the cutting base 4 and drives the movable blade 6 to perform high-speed reciprocating linear motion relative to the fixed blade 5 via a transmission mechanism, forming an efficient shearing engagement. The drive motor 7 is preferably a high-torque DC motor or a servo motor. To facilitate the installation of the drive motor 7, a support plate can be set above the movable blade 6 on the cutting base 4. This serves two purposes: firstly, to install the drive motor 7, and secondly, to form a movable slot chamber for the movable blade 6, thereby increasing safety protection and enhancing sliding guidance.

[0030] Specifically, the drive motor 7 is connected to the movable blade 6 via a crank-slider reciprocating assembly. The reciprocating assembly includes a crank 10 and a horizontal roller 9. One end of the crank 10 is fixed to the output shaft of the drive motor 7 via a key, and the other end is rotatably mounted on the horizontal roller 9 via a bearing. The horizontal roller 9 is nested in the elongated slot 8 in the middle of the movable blade 6, and the width of the horizontal roller 9 matches the width of the elongated slot 8, forming a sliding fit. When the drive motor 7 rotates, the crank 10 drives the horizontal roller 9 to perform a circular motion. The horizontal roller 9 can reciprocate along the elongated slot 8, thus adapting to changes in its position. The rotation of the horizontal roller 9 allows for the conversion of friction with the elongated slot 8 into rolling friction, enhancing the smoothness of the structural movement. Here, the crank converts the rotational motion into linear reciprocating motion of the movable blade 6 along its length.

[0031] To ensure the stability and precision of the shearing action, guide rods are provided at both ends of the movable blade 6. The guide rods cooperate with the linear bearings or sliding sleeves installed on the cutting base 4 to restrict the movable blade 6 to only perform horizontal linear reciprocating sliding and prevent skewing.

[0032] Preferably, the reciprocating shearing frequency of the movable blade 6 is set to 150-200 times / minute, and the stroke is 50-80mm, so as to achieve efficient shearing of rope-like foreign objects of different thicknesses.

[0033] To more effectively hook, guide, and cut rope-like foreign objects, the cutting edge of the fixed blade 5 is designed with multiple V-shaped toothed openings evenly spaced along its length. The toothed openings have a flared shape, wider at the outer edge and narrower at the inner edge, facilitating automatic introduction and positioning of the foreign object and preventing slippage during cutting. The tooth pitch is designed to be 50-80mm, and the tooth depth is 40-80mm. The tooth shape of the movable blade 6 precisely matches the toothed openings of the fixed blade 5, forming an interlaced shearing action.

[0034] To ensure the wear resistance and high strength of the cutting components and extend their service life, both the fixed blade 5 and the movable blade 6 are made of cemented carbide, and the tooth tips are blunted to enhance impact resistance and corrosion resistance.

[0035] The anti-collision assembly is a key component ensuring the safe operation of the mechanism in confined spaces. It includes an anti-collision bar 11 and a pressure sensor. The anti-collision bar 11 is made of stainless steel round steel, with one end fixed to the bottom of the cutting base 4 and extending downwards along the contour of the cleaning machine. A high-sensitivity pressure sensor is installed at the mounting base of the anti-collision bar 11 corresponding to the cutting base 4. The pressure sensor detects changes in pressure on the anti-collision bar 11. If the anti-collision bar 11 touches the rake bucket 13, the anti-collision bar 11 will be squeezed and bent during the rise of the rake bucket 13. At this time, the pressure will be transmitted to the pressure sensor. By detecting different pressure signals, it can be known that the rake bucket 13 has risen and approached.

[0036] In a preferred embodiment of this utility model, two sets of anti-collision bars 11 are provided, which are symmetrically arranged on both sides of the bottom end of the cutting base 4 to provide all-round collision detection without blind spots.

[0037] like Figure 4 As shown, the controller here can be a programmable logic controller (PLC). The controller compares the detected pressure signal with a preset pressure threshold. If the pressure exceeds the threshold, the controller starts the flip motor 3, causing the device to flip upwards to avoid a collision. Whether flipping upwards to avoid a collision or flipping downwards to prepare for work, the controller will perform collision detection based on the pressure signal from the pressure sensor. If such a situation occurs when flipping downwards to prepare for work, it means that a collision is imminent, and in this case, it is still necessary to flip upwards to avoid a collision.

[0038] To facilitate automated operation, a grating sensor is positioned between the two mounting supports 1 and below the tilting shaft 2, forming a straight detection area. This sensor detects whether an object is caught on the rake teeth at one end, with its longer portion hanging or tangled in the empty space between adjacent rake buckets 13 as they rise. Specifically, it detects objects within the empty space between adjacent rake buckets 13. Alternatively, the empty space between adjacent rake buckets 13 can be determined using rake bucket position detection, such as a stroke sensor. This allows for preparation for tilting downwards and proactive anomaly handling. After the object removal operation is complete, the controller reverses the tilting motor 3, causing the cutting component to tilt and exit, accurately resetting to the standby position and avoiding the normally operating rake buckets 13. Alternatively, the controller can be manually controlled. The pressure signal detection and threshold comparison functions described above are existing technologies; the controller can achieve these functions by executing existing preset programs. These are not considered utility model structures and will not be discussed further.

[0039] During normal operation of the cleaning machine, the cutting mechanism is normally in a raised standby state, completely avoiding the circulating rake bucket 13. When a worker or the grating sensor detects foreign objects entangled between adjacent rake buckets 13, the controller activates the flip motor 3 according to a predetermined program, causing the cutting assembly to smoothly flip downwards. During the flipping process, the anti-collision bar 11 always detects first. If the path is unobstructed, the cutting assembly smoothly enters the predetermined working position and efficiently cuts the foreign object; if the anti-collision bar 11 triggers the pressure sensor, the protection program is immediately activated to retract the mechanism. After the cutting task is completed, the mechanism automatically resets to a safe position. The entire process is highly automated, responds quickly, and can handle faults online without stopping the machine, greatly improving the reliability and economy of the nuclear power plant circulating water system.

[0040] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of the patent application of this utility model. All equivalent changes, substitutions, or modifications made within the technical spirit and principles indicated by this utility model should be included within the scope of patent protection covered by this utility model.

Claims

1. A rope-shaped foreign object electric cutting mechanism for a nuclear power plant rotary bar screen cleaner, characterized in that, include: The mounting components include mounting brackets, a tilting shaft, and a tilting motor. The mounting brackets are fixed to the supports on both sides of the screen lifting section of the screen cleaner. The tilting shaft is rotatably connected to the mounting bracket, and one end of it is connected to the tilting motor gear on the mounting bracket; The cutting assembly includes a cutting base, a fixed blade, a movable blade, and a drive motor. It is fixed on a rotating shaft and arranged axially along the rotating shaft. The fixed blade is fixedly connected to the cutting base at one end away from the rotating shaft. The movable blade is slidably engaged with the fixed blade. The drive motor is located on the cutting base and drives the movable blade to reciprocate relative to the fixed blade, forming a shearing engagement. The anti-collision bar is fixed at one end to the bottom of the cutting base and extends along the cleaning machine. A pressure sensor is provided on the anti-collision bar at the corresponding position of the cutting base. The controller is electrically connected to the tilting motor and the drive motor respectively. It can control the tilting motor to rotate forward and reverse, so as to drive the cutting component to rotate and cut into or out of the area between the upper and lower adjacent rake buckets of the cleaning machine. It can also control the tilting motor to drive the cutting component to rotate upward according to the pressure sensor.

2. The electric cutting mechanism for rope-shaped foreign objects in a nuclear power plant rotary bar screen cleaner according to claim 1, characterized in that: The cutting edge of the fixed blade is composed of multiple toothed openings spaced apart along the length of the fixed blade. The fixed blade is balanced with the cutting base, and the toothed openings have a flared shape that is wider on the outside and narrower on the inside.

3. The electric cutting mechanism for rope-shaped foreign objects in a nuclear power plant rotary bar screen cleaner according to claim 2, characterized in that: The tooth pitch of the fixed blade's toothed opening is 50-80mm, and the tooth depth is 40-80mm. The tooth shape of the movable blade is adapted to the toothed opening of the fixed blade.

4. The electric cutting mechanism for rope-shaped foreign objects in a nuclear power plant rotary bar screen cleaner according to claim 1, characterized in that: The drive motor is connected to the movable blade via a reciprocating assembly. The reciprocating assembly includes a crank and a horizontal roller. One end of the crank is fixed to the output shaft of the drive motor, and the other end rotates to fix the horizontal roller. The horizontal roller is fitted into an oblong slot on the movable blade. The width of the horizontal roller and the oblong slot are the same. The oblong slot is located in the middle of the movable blade and is perpendicular to its length direction.

5. The electric cutting mechanism for rope-shaped foreign objects in a nuclear power plant rotary bar screen cleaner according to claim 1, characterized in that: The reciprocating frequency of the movable blade is 150-200 times / minute, and the stroke is 50-80mm.

6. The electric cutting mechanism for rope-shaped foreign objects in a nuclear power plant rotary bar screen cleaner according to claim 1, characterized in that, Two sets of anti-collision bars are provided, located on both sides of the bottom end of the cutting base.

7. The electric cutting mechanism for rope-shaped foreign objects in a nuclear power plant rotary bar screen cleaner according to claim 1, characterized in that: The flip motor is connected to the flip shaft via gears.

8. The electric cutting mechanism for rope-shaped foreign objects in a nuclear power plant rotary bar screen cleaner according to claim 1, characterized in that: Both the fixed and movable blades are made of cemented carbide, and the tips of the teeth are blunted.

9. The electric cutting mechanism for rope-shaped foreign objects in a nuclear power plant rotary bar screen cleaner according to claim 1, characterized in that: The movable blade is provided with sliding rods at both ends, and the sliding rods are connected to the sliding sleeve of the cutting base to limit the linear horizontal sliding of the movable blade.

10. The electric cutting mechanism for rope-shaped foreign objects in a nuclear power plant rotary bar screen cleaner according to claim 1, characterized in that: It also includes a grating sensor, which is disposed between the mounting supports and located below the flip axis, and the grating sensor is connected.

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