A nuclear-grade distributed control system control chassis replacement device

Abstract

The present invention belongs to the technical field of preventive maintenance of nuclear-grade distributed control systems, and specifically relates to a control chassis replacement device for a nuclear-grade distributed control system. The universal wheel is connected to a support base, and two support columns are vertically welded to the support base. The two support columns are connected to a worm gear assembly. The worm gear assembly adopts two sets of worm gear structures. The two sets of worm gears are connected to the steering gear through nuts and connecting rods; the ends of the two sets of worm gears are connected to the bearing plane through nuts, and the double worm gear driving handwheel is connected to the steering gear. The first-level guide rail includes two parallel mounted guide rails, the first-level guide rail is fixed on the bearing plane, and two first-level sliders are installed on each guide rail of the first-level guide rail, and the second-level guide rail includes two guide rails, each guide rail is fixed across the two first-level sliders, and two second-level sliders are installed on each guide rail of the second-level guide rail. The present invention can be used to disassemble and install a large and heavy control chassis in a narrow cabinet.

Description

Technical Field

[0001] The present invention belongs to the technical field of preventive maintenance of nuclear-level distributed control systems, and in particular relates to a control chassis replacement device for a nuclear-level distributed control system. Background Art

[0002] The nuclear-grade distributed control system (Level 1E DCS system) is the nerve center of a nuclear power plant. It mainly implements the logic of the reactor protection system, dedicated safety system control, radiation monitoring and interlocking control, and post-accident important parameter monitoring. It is a key equipment for maintaining the integrity of the three barriers of nuclear safety.

[0003] Fuqing Units 1 to 4 use the Tricon platform in their Class 1E DCS system, which is designed with a control chassis for installing processor cards, I / O cards, communication cards, power supplies, etc. These functional cards communicate with each other and with field sensors / actuators through the chassis backplane. A chassis failure will affect the functions of all cards on the chassis, and may even lead to the loss of control system functions, with a wide impact range and serious consequences. Therefore, chassis failures must be handled quickly to eliminate safety threats to the units.

[0004] The three-dimensional dimensions of the Tricon control chassis are approximately 480*425*578mm, weighing approximately 24.5kg. It is a 5-sided closed structure, fixed to the 4 columns in the cabinet by screws on the left and right sides. During the cabinet integration and assembly, the chassis is installed first, and the cabinet side panels are not installed, there are no obstacles, and force can be applied in multiple directions; after the control cabinet is integrated, in addition to the chassis, a large number of other components and cables are installed in the internal space. These components are all installed on the outside of the chassis, and the cabinets are placed side by side during on-site installation. Only the front and rear doors can be opened to show the operator's field of vision. At present, when the chassis needs to be replaced on site, only one side of the cabinet front door has an operation window, which can only accommodate one person. It is difficult for an operator to lift and stabilize the 24.5kg weight at a position with bare hands, not to mention that he has to free his hands to tighten the screws to fix the chassis in the cabinet; and the existing lifting and handling equipment cannot be operated in a narrow cabinet. Summary of the invention

[0005] The purpose of the present invention is to provide a nuclear-grade distributed control system control chassis replacement device, which can be used to dismantle and install a large and heavy control chassis in a narrow cabinet to prevent personal injury and damage to precision electronic devices during operation.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A nuclear-grade distributed control system control chassis replacement device, four universal wheels connected to a support base, two support columns vertically welded to the support base, the two support columns connected to a worm gear assembly, the worm gear assembly adopts two sets of worm gear structures, the two sets of worm gears are connected to a steering gear through nuts and connecting rods; the ends of the two sets of worm gears are connected to a bearing plane through nuts, a double worm gear driving hand wheel is connected to the steering gear, a first-level guide rail includes two parallel mounted guide rails, the first-level guide rail is fixed on the bearing plane, two first-level sliders are installed on each guide rail of the first-level guide rail, and a second-level guide rail includes two guide rails, each guide rail is fixed across the two first-level sliders, and two second-level sliders are installed on each guide rail of the second-level guide rail.

[0008] The universal wheel adopts four 1.5-inch small wheels, and the universal wheel is connected to the supporting base through four bolts and nuts.

[0009] The support base is made of 10mm steel plate, 400mm wide and 550mm long. The upper edge of the support base is no more than 90mm from the ground. At 400mm in the length direction and at the edge position in the width direction, a support column is welded vertically to the support base.

[0010] The supporting column is made of U-shaped frame steel, 1500mm high, and the vertical part is designed with 2 installation interfaces, one interface is located at a height of 500mm and the other is located at a height of 800mm.

[0011] The double worm gear driving hand wheel is designed with a clutch locking device, and the hand wheel can be rotated only when the shaft of the hand wheel is pulled out.

[0012] The worm gear assembly has a stroke of 450 mm, a speed ratio of 1:6, a tooth pitch of 4 mm, and has a self-locking characteristic, and can stay at any position of the stroke to remain stable.

[0013] The bearing plane is a 400x400 frame plane.

[0014] The control chassis is placed on the second-level slide.

[0015] When installing the control chassis, first place the control chassis on the second-level slider, and drive the universal wheels on the support base by pushing and pulling the supporting columns to move it in the factory; when it reaches the position of the cabinet to be installed, turn the double worm gear drive handwheel, move the worm up and down, and adjust the height of the bearing plane so that the control chassis reaches the approximate installation height. Then, align the support base with the notch at the bottom of the cabinet and push it into the cabinet. The control chassis will be sent into the cabinet together with the support base; turn the double worm gear drive handwheel to fine-tune the height of the control chassis again, hold the control chassis by hand, and move it left and right and front and back on the guide rail so that the mounting holes of the control chassis are aligned with the fixing holes on the cabinet, and tighten the fixing bolts to complete the installation of the control chassis.

[0016] When disassembling the control chassis, align the support base with the notch at the bottom of the cabinet, push it into the cabinet, turn the double worm gear drive handwheel, move the worm up and down, adjust the height of the load-bearing plane, so that the second-level slider on the load-bearing plane drags the control chassis, loosen the fixing bolts of the control chassis so that it is supported by this device, hold the control chassis, hold the supporting columns, pull this device and the control chassis out of the cabinet, and complete the disassembly of the control chassis.

[0017] The beneficial effects achieved by the present invention are:

[0018] Aiming at the problem of chassis replacement encountered on site, the present invention has been specifically designed to meet the needs of carrying precision, large-volume and heavy objects in a small space and lifting the objects to a designated location;

[0019] The positioning accuracy of the present invention can reach 1mm, which can effectively solve the space, weight and positioning accuracy problems encountered in the installation of the chassis of the nuclear-grade DCS system of the Tricon platform.

[0020] The present invention can bear a load of 40kg, has vertical, horizontal, and horizontal front and back three-dimensional movement, and has two amplitude displacement adjustment capabilities, so as to realize accurate movement and positioning of the control chassis to the installation position.

[0021] The device is easy to operate and does not require prior training. You can operate it by reading the simple operating manual.

[0022] By using this device, the efficiency of chassis replacement can be greatly improved, the construction period can be shortened, and the risks in the processing process can be reduced.

[0023] The present invention can lift the control chassis to an appropriate height, and provide a comfortable working platform for operators during the process of setting chassis address codes (welding short-circuit wires), card key positions, and prefabricated cable key positions for spare parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the patent system structure;

[0025] Figure 2 This is a schematic diagram of the lifting mechanism of the patented system;

[0026] Figure 3 This is a schematic diagram of the support base of the patented system;

[0027] Figure 4 This is a schematic diagram of the patent system carrier platform;

[0028] In the figure: 1: universal wheel; 2: support base; 3: support column; 4: double worm gear drive handwheel; 5: worm gear assembly; 6: steering gear; 7: bearing plane; 8: first-stage guide rail; 9: first-stage slider; 10: second-stage guide rail; 11: second-stage slider. DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1 As shown in FIG. 4 , the present invention adopts modular design and installation, which is mainly divided into three parts: a load-bearing and mobile platform, a lifting mechanism, and a horizontal displacement adjustment mechanism. The load-bearing and mobile platform is based on the principle of a flatbed trolley, and an "inverted T"-shaped basic support structure is designed as the main mobile platform. The "inverted T"-shaped structure is an asymmetric design to balance the center of gravity of the device; in the vertical direction of the "inverted T" structure, two installation positions are designed, which can be lifted as needed to adjust the installation height of the lifting mechanism assembly to achieve the optimal action range, and the lifting mechanism assembly can be designed to be more sophisticated.

[0031] The lifting mechanism part utilizes the worm gear principle to convert rotational motion into planar linear motion. The worm gear structure has a large transmission ratio, high load-bearing capacity, smooth transmission, and self-locking property. Through the reasonable selection of the tooth ratio, a higher displacement accuracy can be obtained. Therefore, the present invention uses a worm gear assembly as an action mechanism in a vertical position, fixes the worm wheel on the column of the mobile platform, and the worm is the free end. A platform is connected to the end of the worm to place and connect the horizontal displacement adjustment mechanism, so as to lift the control chassis to a specified height in the vertical direction.

[0032] The horizontal displacement adjustment mechanism adopts a slider assembly, which is placed on a platform connected to the lifting mechanism and kept horizontal. Two sets of superimposed slide rails are used. The guide rails of the two lower sets of slider assemblies are fixed on a plane, and the slider is fixed to the guide rail of the second set of assemblies to achieve free displacement in two directions of the XY orthogonal axis. The control chassis contacts the present invention through the slider.

[0033] The bearing and mobile platform of the present invention is the basic structure, and its specific implementation is as follows:

[0034] The universal wheel 1 has four 1.5-inch small wheels and a universal wheel structure. The total height of the wheel and the mounting bracket is about 70 mm. Each universal wheel bracket is connected to the supporting base 2 by four bolts and nuts.

[0035] The support base 2 is made of 10mm steel plate, 400mm wide and 550mm long. The upper edge of the support base is controlled to be no more than 90mm above the ground so that the platform can move through the lower space of the cabinet. At 400mm in the length direction and at the edge position in the width direction, the vertical base is welded with a support column 3.

[0036] The supporting column 3 is made of U-shaped frame steel, with a height of 1500mm. The vertical part is designed with 2 installation interfaces, which are connected to the worm gear lifting mechanism through bolts. One interface is located at a height of 500mm and the other is located at 800mm.

[0037] The double worm gear drive hand wheel 4 is connected to the steering gear 6 through a nut. In order to prevent the upgrade mechanism from moving due to accidental hand wheel operation, the hand wheel is designed with a clutch locking device. The hand wheel can only be turned when the shaft of the hand wheel is pulled out.

[0038] The worm gear assembly 5 adopts two sets of worm gear structures with a stroke of 450mm, a speed ratio of 1:6, a tooth pitch of 4mm, and a self-locking characteristic. It can stay at any position of the stroke and remain stable. The worm wheels of the two pairs of worm gears are connected to the steering gear 6 through nuts and connecting rods; the ends of the two pairs of worm gears are connected to the load-bearing plane 7 through nuts.

[0039] The steering gear 6 is connected to the double worm gear driving handwheel and worm wheel through a nut, transmitting the rotational motion of the handwheel to the worm wheel of the worm gear, so that the two worm wheels move in the same direction at the same time, and the worms rise or fall at the same time.

[0040] The load-bearing plane 7 is a 400x400 frame plane, which serves as the support surface of the slide rail, transfers the weight of the equipment object to the base, is connected to the end of the worm by bolts, moves up and down with the worm, and is held at a fixed point.

[0041] The first-level guide rail 8 includes two parallel mounted guide rails, each of which is fixed to the bearing plane 7 using two screws.

[0042] The first-stage slider 9 moves in parallel on the first-stage guide rail 8, and there are two sliders on each guide rail.

[0043] The second-stage guide rail 10 includes two guide rails, which span across the two first-stage sliders 9 , are fixed to the first-stage sliders 9 by screws, and move with the first-stage sliders 9 .

[0044] The second-level slider 11 moves on the second-level guide rail 10. Each guide rail has two sliders. The chassis device object to be moved is placed on the second-level slider.

[0045] When using this device to install a control chassis, first place the control chassis on the four second-level sliders, and by pushing and pulling the supporting columns, drive the universal wheels on the base to move it in the factory; when reaching the position of the cabinet to be installed, turn the hand wheel, move the worm up and down, and adjust the height of the bearing plane so that the control chassis reaches the approximate installation height, align the supporting base with the notch at the bottom of the cabinet, push it into the cabinet, and the chassis will be sent into the cabinet together with the base; turn the hand wheel to fine-tune the height of the chassis again, hold the chassis by hand, and move it left and right and front and back on the slide rails so that the mounting holes of the chassis are aligned with the fixing holes on the cabinet, and tighten the fixing bolts to complete the installation of the control chassis.

[0046] When using this device to dismantle the control chassis, align the support base with the notch at the bottom of the cabinet, push it into the cabinet, turn the hand wheel, move the worm up and down, adjust the height of the load-bearing plane, so that the second-level slider on the load-bearing surface drags the control chassis, loosen the fixing bolts of the control chassis so that it is supported by the device, hold the control chassis, hold the supporting columns, pull the device and the control chassis out of the cabinet, and complete the dismantling of the control chassis.

[0047] The present invention is designed for the chassis of the Tricon platform DCS control system, which can be used for the maintenance of the 1E-level DCS system of Fuqing Units 1 to 4, Fangjiashan Nuclear Power, and Hainan Nuclear Power. The Tricon platform is also widely used in the petrochemical industry and can be further promoted to users in other industries who use the Tricon control chassis. At the same time, the present invention adopts modular design and installation. By replacing one of the components, a wider range of applications can be achieved. For example, replacing the horizontal displacement adjustment platform with a support arm can be used for small-scale lifting work for installing servers in narrow trays. The device is moved and positioned in the vertical direction by a worm gear, and horizontally moved and positioned by a combination of a universal wheel and a slide rail / slider in the horizontal direction.

Claims

1. A nuclear-level distributed control system control chassis replacement device, characterized in that: Four universal wheels are connected to the support base, and two supporting columns are vertically welded to the support base. The two supporting columns are connected to the worm gear assembly. The worm gear assembly adopts two sets of worm gear structures. The two sets of worm gears are connected to the steering gear through nuts and connecting rods; the ends of the two sets of worm gears are connected to the bearing plane through nuts, and the double worm gear driving handwheel is connected to the steering gear. The first-level guide rail includes two parallel installed guide rails, the first-level guide rail is fixed on the bearing plane, and two first-level sliders are installed on each guide rail of the first-level guide rail. The second-level guide rail includes two guide rails, each guide rail is fixed across the two first-level sliders, and two second-level sliders are installed on each guide rail of the second-level guide rail.

2. The nuclear-grade distributed control system control chassis replacement device according to claim 1, characterized in that: The universal wheel adopts four 1.5-inch small wheels, and the universal wheel is connected to the supporting base through four bolts and nuts.

3. The nuclear-grade distributed control system control chassis replacement device according to claim 1, characterized in that: The support base is made of 10mm steel plate, 400mm wide and 550mm long. The upper edge of the support base is no more than 90mm from the ground. At 400mm in the length direction and at the edge position in the width direction, a support column is welded vertically to the support base.

4. The nuclear-grade distributed control system control chassis replacement device according to claim 1, characterized in that: The supporting column is made of U-shaped frame steel, 1500mm high, and the vertical part is designed with 2 installation interfaces, one interface is located at a height of 500mm and the other is located at a height of 800mm.

5. The nuclear-grade distributed control system control chassis replacement device according to claim 1, characterized in that: The double worm gear driving hand wheel is designed with a clutch locking device, and the hand wheel can be rotated only when the shaft of the hand wheel is pulled out.

6. The nuclear-grade distributed control system control chassis replacement device according to claim 1, characterized in that: The worm gear assembly has a stroke of 450 mm, a speed ratio of 1:6, a tooth pitch of 4 mm, and has a self-locking characteristic, and can stay at any position of the stroke to remain stable.

7. The nuclear-grade distributed control system control chassis replacement device according to claim 1, characterized in that: The bearing plane is a 400x400 frame plane.

8. The nuclear-grade distributed control system control chassis replacement device according to claim 1, characterized in that: The control chassis is placed on the second-level slide.

9. The nuclear-grade distributed control system control chassis replacement device according to claim 1, characterized in that: When installing the control chassis, first place the control chassis on the second-level slider, and then push and pull the support column to drive the universal wheel on the support base to move it in the factory. When the cabinet to be installed is reached, turn the double worm gear drive hand wheel, move the worm up and down, and adjust the height of the load-bearing plane. When the control chassis reaches the installation height, align the support base with the notch at the bottom of the cabinet and push it into the cabinet. The control chassis will be sent into the cabinet together with the support base. Turn the double worm gear drive handwheel to fine-tune the height of the control chassis again, hold the control chassis, and move it left and right and front and back on the guide rails so that the mounting holes of the control chassis are aligned with the fixing holes on the cabinet, tighten the fixing bolts, and the installation of the control chassis is completed.

10. The nuclear-grade distributed control system control chassis replacement device according to claim 1, characterized in that: When disassembling the control chassis, align the support base with the notch at the bottom of the cabinet, push it into the cabinet, turn the double worm gear drive handwheel, move the worm up and down, adjust the height of the load-bearing plane, so that the second-level slider on the load-bearing plane drags the control chassis, loosen the fixing bolts of the control chassis so that it is supported by this device, hold the control chassis, hold the supporting columns, pull this device and the control chassis out of the cabinet, and complete the disassembly of the control chassis.

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