Tool and method for disassembling, assembling and transferring obliquely-arranged heavy manhole cover plate

Abstract

The invention belongs to the technical field of nuclear power overhaul, and particularly relates to an obliquely-arranged heavy manhole cover plate disassembling, assembling and transferring tool and method. Comprising a sloping bench trolley and a cover plate bracket, and the sloping bench trolley is provided with the cover plate bracket. The device has the beneficial effects that the functions of disassembly, storage, carrying and installation of the primary side manhole cover plate of the steam generator can be achieved; the manhole cover plate can be mounted and dismounted simply, conveniently and quickly; and the equipment structure can ensure the use reliability, operability and maintainability of the equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power maintenance, and in particular relates to a tool and method for disassembling, assembling and transporting a heavy-duty manhole cover plate arranged obliquely. Background Art

[0002] The disassembly, assembly and transportation device of the manhole cover on the primary side of the steam generator is an essential special tool for nuclear power maintenance, which is used for the installation, disassembly and transportation of the manhole cover. The manhole cover on the primary side of the steam generator weighs nearly 400 kilograms, and this tool must be used during each shutdown and maintenance of the nuclear power plant. There are two main conventional practices. One is to use a manhole cover hoist for disassembly, but after the disassembly, there are problems such as difficulty in transporting and storing the cover; the other is to use multiple hand winches for lifting and disassembly. This method tests the operating skills of the personnel, and there are problems such as difficulty in balancing multiple lifting points, difficulty in storage and transportation, and long disassembly time. It is not convenient for rapid disassembly on site. Therefore, it is necessary to design a disassembly, assembly and transportation tool suitable for heavy covers. This set of tools requires the ability to quickly and easily install and disassemble the manhole cover to save manpower and operating time, while reducing the requirements for the operator himself. Summary of the invention

[0003] The purpose of the present invention is to provide a tool and method for disassembling and transporting heavy-duty manhole covers that are arranged obliquely, which can quickly and accurately disassemble the covers, reduce the requirements of the tool on the operator itself, solve the cover storage problem of the manhole cover hoist, and the problem that multiple lifting points of the hand-pulled winch disassembly are difficult to balance and have high requirements for personnel operation.

[0004] The technical solution of the present invention is as follows: a heavy-duty manhole cover disassembly, assembly and transportation tool arranged obliquely, comprising an inclined platform trolley and a cover bracket, wherein the cover bracket is installed on the inclined platform trolley.

[0005] The inclined platform trolley comprises a positioning bracket, a hook and a sliding nut assembly, a slope adjustment screw device, a left and right adjustment screw device, a caster assembly, an L-shaped bracket, a height adjustment screw device, a vertical fixing bolt, an adjustment device, a bracket frame, a horizontal adjustment bolt, a roller shaft, a fastening nut, a connecting shaft and a fixing device. The lower end of the horizontal part of the L-shaped bracket is connected to the first caster assembly, the vertical part of the L-shaped bracket is connected to the height adjustment screw device through a support, the lower part of the height adjustment screw device is connected to the second caster assembly, and the L-shaped bracket The upper part of the vertical part of the frame is connected to the bracket frame through a fixing device, and the lower part of the bracket frame is provided with a left and right adjusting screw device, which is connected to the inclination adjusting screw device, and the inclination adjusting screw device is connected to the intersection of the vertical part and the horizontal part of the L-shaped bracket. A positioning bracket is connected to one side of the bracket frame, and a hook and a sliding nut assembly is connected to the middle position of the bracket frame. An adjusting device, a vertical fixing bolt and a horizontal adjusting bolt are installed on the upper part of the bracket frame, and the relative position of the manhole cover in the vertical direction is adjusted by the vertical fixing bolt.

[0006] The lower end of the bracket frame is connected to the coupling and the reducer assembly.

[0007] The horizontal adjustment bolt adjusts the relative position of the manhole cover plate in the horizontal direction inside the bracket frame.

[0008] Four single-edge rollers are installed at the bottom of the cover bracket, and the single edge of the single-edge roller can prevent the cover bracket from lateral displacement on the track assembly.

[0009] The bottom of the cover bracket is equipped with a connecting shaft, which cooperates with the hook of the inclined platform trolley to achieve the connection between the inclined platform trolley and the cover bracket.

[0010] A method for disassembling and transporting a heavy-duty manhole cover using an inclined arrangement of tools comprises the following steps:

[0011] 1) Transport the cover plate vehicle together with the cover plate bracket with the manhole cover plate and the inclined platform trolley to the vicinity of the steam generator manhole;

[0012] 2) Push the inclined platform trolley to the installation position below the manhole;

[0013] 3) Push the cover plate trolley with the cover plate bracket to the rear of the ramp trolley and place it facing the ramp trolley;

[0014] 4) Move the cover bracket to rotate around the support shaft, and at the same time drive the reducer on the ramp trolley until the pin on the sliding nut completely locks the seat on the cover bracket;

[0015] 5) Continue to drive the reducer to raise the cover bracket to a suitable installation position;

[0016] 6) Adjust the relative position of the manhole cover and the manhole flange surface through the adjusting device;

[0017] 7) Install several manhole bolts evenly to ensure that the cover plate and the manhole flange are tightly connected;

[0018] 8) Loosen the fixing bolts on the cover bracket and the clamping devices at both ends to separate the manhole cover and the cover bracket;

[0019] 9) Reverse drive the reducer on the ramp trolley until the cover bracket returns to the cover trolley;

[0020] 10) Install the remaining manhole bolts;

[0021] 11) Remove all installation tools.

[0022] The beneficial effects of the present invention are: it can meet the functions of disassembly, storage, transportation and installation of the manhole cover on the primary side of the steam generator; it can meet the simple, convenient and fast installation and disassembly operations of the manhole cover; the equipment structure can ensure the reliability, operability and maintainability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is an assembly diagram of a heavy-duty manhole cover disassembly and transfer tool provided by the present invention;

[0024] Figure 2 This is the structural diagram of the inclined platform trolley;

[0025] Figure 3 This is the front view of the cover bracket;

[0026] Figure 4 It is a side view of the cover bracket;

[0027] Figure 5 This is the structural diagram of the cover car.

[0028] In the figure: 1 inclined platform trolley, 2 cover bracket, 3 positioning bracket, 4 screw guide rail assembly, 5 hook and sliding nut assembly, 6 inclination adjustment screw device, 7 left and right adjustment screw device, 8 coupling, 9 reducer assembly, 10 caster assembly, 11 L-type bracket, 12 height adjustment screw device, 13 vertical fixing bolt, 14 adjustment device, 15 bracket frame, 16 horizontal adjustment bolt, 17 single-edge roller, 18 roller shaft, 19 fastening nut, 20 connecting shaft, 21 fixing device, 23 second caster assembly. DETAILED DESCRIPTION

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

[0030] The disassembly, assembly and transportation tools for the primary side manhole cover and bolt tensioner of the steam generator are mainly used for the disassembly, storage, transportation and installation of the manhole cover and bolt tensioner, including the inclined platform trolley, cover trolley, cover bracket and bolt tensioner bracket device. The overall composition and functions of the equipment are as follows.

[0031] like Figure 1 As shown, a heavy-duty manhole cover disassembly, assembly and transportation tool arranged obliquely comprises: an inclined platform trolley 1 and a cover bracket 2, and the cover bracket 2 is installed on the inclined platform trolley 1.

[0032] like Figure 2 As shown, the inclined platform trolley 1 includes a positioning bracket 3, a screw guide rail assembly 4, a hook and sliding nut assembly 5, an inclination adjustment screw device 6, a left and right adjustment screw device 7, a coupling 8, a reducer assembly 9, a caster assembly 10, an L-shaped bracket 11, a height adjustment screw device 12, a vertical fixing bolt 13, an adjustment device 14, a bracket frame 15, a horizontal adjustment bolt 16, a single-edge roller 17, a roller shaft 18, a fastening nut 19, a connecting shaft 20 and a fixing device 21; wherein, a first caster assembly 10 is connected to a lower end of the horizontal part of the L-shaped bracket 11, a height adjustment screw device 12 is connected to the vertical part of the L-shaped bracket 11 through a support, a second caster assembly 23 is connected to the lower part of the height adjustment screw device 12, and the L-shaped bracket 11 The upper part of the vertical part is connected to the bracket frame 15 through the fixing device 21, and the lower part of the bracket frame 15 is provided with a left and right adjustment screw device 7, and the left and right adjustment screw device 7 is connected to the inclination adjustment screw device 6, and the inclination adjustment screw device 6 is connected to the intersection of the vertical part and the horizontal part of the L-shaped bracket 11. A positioning bracket 3 is connected to one side of the bracket frame 15, and a hook and sliding nut assembly 5 is connected to the middle position of the bracket frame 15. The lower end of the bracket frame 15 is connected to the coupling 8 and the reducer assembly 9. The upper part of the bracket frame 15 is installed with an adjustment device 14 for manually adjusting the relative position of the manhole cover plate and the cover plate bracket, a vertical fixing bolt 13 and a horizontal adjustment bolt 16. The relative position of the manhole cover plate in the vertical direction is adjusted by the vertical fixing bolt 13. The horizontal adjustment bolt 16 can adjust the relative position of the manhole cover plate in the horizontal direction inside the bracket frame 15. The principles of both are threaded transmission, and the purpose of adjustment is to ensure the relative position of the manhole cover plate and the manhole surface of the evaporator. A connecting shaft 20 is assembled at the bottom of the cover bracket, and cooperates with the hook 5 of the ramp trolley to realize the connection between the ramp trolley and the cover bracket.

[0033] like Figure 3 As shown, four single-edge rollers 17 are installed at the bottom of the cover bracket 2. The single-edge rollers 17 are installed at the bottom of the cover bracket through roller shafts 18 and fastening nuts 19. The single edge of the roller can prevent the cover bracket from lateral displacement on the track assembly.

[0034] like Figure 4As shown, the inclined platform trolley is mainly used to store and carry the manhole cover and the cover bracket. The cover trolley connects the cover bracket and the manhole cover into a whole through bolts, which is convenient for storage and transportation.

[0035] The inclined platform trolley is designed with an adjustable cover plate fixing device 21 to prevent the cover plate bracket from falling off from the cover plate trolley during transportation. The inclined platform trolley is equipped with 4 casters 23 for easy transportation.

[0036] The manhole cover and cover bracket are fixed on the ramp trolley as a whole through a hook. The main function of the ramp trolley is to drive the manhole cover and cover bracket as a whole to the flange surface of the evaporator manhole through the hand-cranked reducer to drive the T-type screw in the screw guide rail assembly 4 located on the positioning bracket 3. The track is installed below the trapezoidal screw in the screw guide rail assembly 4, and the slide seat and the sliding nut are rigidly connected to form a hook and sliding nut assembly, which can eliminate the rotation of the sliding nut around the transmission shaft and ensure that the rotation of the screw can be converted into the linear motion of the manhole cover and cover bracket on the guide rail assembly.

[0037] The input of the transmission structure of the inclined platform trolley is the input shaft of the reducer, which can be driven by manual, electric, pneumatic and other methods. After passing through the reducer, the trapezoidal thread and sliding nut realize the displacement of the cover bracket along the screw guide rail assembly on the inclined platform trolley.

[0038] The transmission form of the inclined platform trolley is a sliding screw transmission, which adopts an integral hook and sliding nut assembly 5, wherein the nut performs linear motion on the screw.

[0039] The height, inclination and left-right level of the inclined platform trolley are all equipped with inclination adjustment screw devices 6, left-right adjustment screw devices 7 and height adjustment screw devices 12, which can facilitate the centering of on-site equipment and meet the adjustment capabilities of the angle, height and horizontal position of the inclined platform trolley to facilitate the installation of the manhole cover.

[0040] The present invention can be used to decompose the maintenance work of heavy manhole covers and bolt tensioners into four steps: disassembly, storage, transportation and installation, and according to these steps, an inclined platform trolley, a cover trolley, a cover bracket device and a bolt tensioner bracket device need to be designed.

[0041] A method for disassembling and transporting a heavy-duty manhole cover using an inclined arrangement of tools, the specific process is as follows:

[0042] 1) Transport the cover plate vehicle together with the cover plate bracket with the manhole cover plate and the inclined platform trolley to the vicinity of the steam generator manhole.

[0043] 2) Push the inclined platform trolley to the installation position under the manhole.

[0044] 3) Push the cover trolley with the cover bracket to the rear of the ramp trolley and place it facing the ramp trolley.

[0045] 4) Move the cover bracket to rotate it around the support shaft, and at the same time drive the reducer on the ramp trolley until the pin on the sliding nut completely engages the seat on the cover bracket.

[0046] 5) Continue to drive the reducer to raise the cover bracket to a suitable installation position.

[0047] 6) Adjust the relative position of the manhole cover and the manhole flange surface through the adjusting device.

[0048] 7) Evenly install several manhole bolts to ensure that the cover plate and the manhole flange are tightly connected.

[0049] 8) Loosen the fixing bolts on the cover bracket and the clamping devices at both ends to separate the manhole cover and the cover bracket.

[0050] 9) Reverse drive the reducer on the ramp trolley until the cover bracket returns to the cover trolley.

[0051] 10) Install the remaining manhole bolts.

[0052] 11) Remove all installation tools.

[0053] 12) The disassembly process is the reverse process of installation and will not be elaborated here one by one.

Claims

1. A heavy-duty manhole cover disassembly, assembly and transportation tool arranged obliquely, characterized in that: It comprises an inclined platform trolley and a cover plate bracket, and the cover plate bracket is installed on the inclined platform trolley.

2. The heavy-duty manhole cover disassembly, assembly and transportation tool arranged obliquely according to claim 1, characterized in that: The inclined platform trolley comprises a positioning bracket, a hook and a sliding nut assembly, a slope adjustment screw device, a left and right adjustment screw device, a caster assembly, an L-shaped bracket, a height adjustment screw device, a vertical fixing bolt, an adjustment device, a bracket frame, a horizontal adjustment bolt, a roller shaft, a fastening nut, a connecting shaft and a fixing device. The lower end of the horizontal part of the L-shaped bracket is connected to the first caster assembly, the vertical part of the L-shaped bracket is connected to the height adjustment screw device through a support, the lower part of the height adjustment screw device is connected to the second caster assembly, and the L-shaped bracket The upper part of the vertical part of the frame is connected to the bracket frame through a fixing device, and the lower part of the bracket frame is provided with a left and right adjusting screw device, which is connected to the inclination adjusting screw device, and the inclination adjusting screw device is connected to the intersection of the vertical part and the horizontal part of the L-shaped bracket. A positioning bracket is connected to one side of the bracket frame, and a hook and a sliding nut assembly is connected to the middle position of the bracket frame. An adjusting device, a vertical fixing bolt and a horizontal adjusting bolt are installed on the upper part of the bracket frame, and the relative position of the manhole cover in the vertical direction is adjusted by the vertical fixing bolt.

3. The heavy-duty manhole cover disassembly, assembly and transportation tool arranged obliquely according to claim 2, characterized in that: The lower end of the bracket frame is connected to the coupling and the reducer assembly.

4. The heavy-duty manhole cover disassembly, assembly and transportation tool arranged obliquely according to claim 2, characterized in that: The horizontal adjustment bolt adjusts the relative position of the manhole cover plate in the horizontal direction inside the bracket frame.

5. The heavy-duty manhole cover disassembly, assembly and transportation tool arranged obliquely according to claim 1, characterized in that: Four single-edge rollers are installed at the bottom of the cover bracket, and the single edge of the single-edge roller can prevent the cover bracket from lateral displacement on the track assembly.

6. The heavy-duty manhole cover disassembly, assembly and transportation tool arranged obliquely according to claim 1, characterized in that: The bottom of the cover plate bracket is equipped with a connecting shaft, which cooperates with the hook of the inclined platform trolley to achieve the connection between the inclined platform trolley and the cover plate bracket.

7. A method for disassembling and transporting the heavy-duty manhole cover plate arranged obliquely according to claims 1-6, characterized in that: The steps include: 1) Transport the cover plate vehicle together with the cover plate bracket with the manhole cover plate and the inclined platform trolley to the vicinity of the steam generator manhole; 2) Push the inclined platform trolley to the installation position below the manhole; 3) Push the cover plate trolley with the cover plate bracket to the rear of the ramp trolley and place it facing the ramp trolley; 4) Move the cover bracket to rotate around the support shaft, and at the same time drive the reducer on the ramp trolley until the pin on the sliding nut completely locks the seat on the cover bracket; 5) Continue to drive the reducer to raise the cover bracket to a suitable installation position; 6) Adjust the relative position of the manhole cover and the manhole flange surface through the adjusting device; 7) Install several manhole bolts evenly to ensure that the cover plate and the manhole flange are tightly connected; 8) Loosen the fixing bolts on the cover bracket and the clamping devices at both ends to separate the manhole cover and the cover bracket; 9) Reverse drive the reducer on the ramp trolley until the cover bracket returns to the cover trolley; 10) Install the remaining manhole bolts; 11) Remove all installation tools.

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