Vertical high-pressure heater manhole door dismounting device

Abstract

The utility model relates to a dismounting device, in particular to a manhole door dismounting device for a vertical high-pressure heater, which comprises a frame, a telescopic cylinder is arranged at the bottom of the frame, and the telescopic end of the telescopic cylinder is connected with a manhole seat through a connecting sleeve; the telescopic cylinder is communicated with the hydraulic operation pump through a hydraulic oil pipe; the frame is provided with a support member. The manhole seat is disc-shaped, and a plurality of connecting holes are formed in the manhole seat; the connecting holes are evenly distributed in the circumferential direction of the manhole seat. The supporting piece comprises a supporting column and a supporting ring, the supporting column is provided with external threads, the supporting ring is provided with internal threads, and the supporting column is in threaded connection with the supporting ring. The manhole door dismounting efficiency can be improved, and the safety of technicians can be guaranteed.

Description

Technical Field

[0001] This utility model relates to a disassembly device, specifically a disassembly device for a manhole door of a vertical high-pressure heater. Background Technology

[0002] High-pressure heaters are one of the main auxiliary equipment in thermal power plants. They extract the steam that has done work in the turbine to heat the boiler feedwater, thereby improving the power plant's thermal efficiency and reducing coal consumption. Because high-pressure heaters operate on both steam and water sides under high temperature and pressure for extended periods, internal tube bundle leaks are prone to occur, requiring emergency repairs. Furthermore, operating units regularly conduct major, medium, and minor overhauls for equipment maintenance. The current 330MW thermal power unit's high-pressure heater is a vertical, self-sealing, U-tube, dual-flow surface heater. Due to the high operating pressure (generally above 18MPa), the water-side manhole uses a self-sealing structure. The manhole is located at the bottom, making its disassembly particularly difficult.

[0003] During emergency repairs, the timeframe is limited. If manual repairs are used, hot water that cannot drain from above the self-sealing manhole may accumulate. If repair personnel are dismantling the manhole and cannot evacuate quickly enough due to the confined space below, they are at risk of burns. Using tools such as hand hoists or jacks to pull or lift the manhole during self-sealing removal is extremely unsafe, and the lack of a support point directly below the manhole will significantly extend the repair time. Utility Model Content

[0004] The purpose of this invention is to provide a dismantling device for a vertical high-pressure heater manhole door, which solves the problems of long dismantling time and low efficiency of current manhole door dismantling.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A vertical high-pressure heater manhole door dismantling device includes a frame, a telescopic cylinder at the bottom of the frame, and a manhole seat connected to the telescopic end of the telescopic cylinder via a connecting sleeve; the telescopic cylinder is connected to a hydraulic operating pump via a hydraulic oil pipe; and a support is provided on the frame.

[0007] Furthermore, the manhole seat is disc-shaped and has a plurality of connecting holes; the connecting holes are evenly distributed along the circumference of the manhole seat.

[0008] Furthermore, the support member includes a support column and a support ring, the support column having external threads and the support ring having internal threads, and the support column and the support ring being threadedly connected.

[0009] Furthermore, the telescopic cylinder has a threaded portion on its telescopic end, and the threaded portion has an external thread. The manhole seat has a fixing hole. One end of the connecting sleeve is threadedly connected to the telescopic end of the telescopic cylinder, and the other end is connected to the fixing hole of the manhole seat. The fixing hole has an internal thread.

[0010] Furthermore, the frame is square, with two reinforcing ribs on it; a guide is provided between the two reinforcing ribs, and the telescopic cylinder is connected to the guide; the guide is provided with a guide hole, through which the telescopic end of the telescopic cylinder passes.

[0011] Furthermore, the frame is provided with multiple support feet at its bottom.

[0012] Furthermore, the frame includes uprights and multiple crossbeams, with four crossbeams connected end to end to form a top support frame, and another four crossbeams connected end to end to form a bottom support frame; the top support frame and the bottom support frame are connected by uprights.

[0013] Furthermore, the upright is provided with a reinforcing beam.

[0014] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0015] This invention, when disassembling a manhole door, places the device below the manhole door. First, the manhole cover is removed; it will fall onto the device, preventing it from falling to the ground and causing injury or rendering it unusable. After removing the manhole cover, a telescopic cylinder lifts the high-pressure self-sealing block upwards to a suitable position, creating space for the removal of the quarter-ring gasket. A technician then removes the quarter-ring gasket. Finally, the connecting hole on the manhole seat is connected to the high-pressure self-sealing block with bolts, and the telescopic cylinder is used to remove the high-pressure self-sealing block downwards, completing the disassembly of the manhole door. This invention improves the efficiency of manhole door disassembly and ensures the safety of technicians. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a manhole door disassembly device for a vertical high-pressure heater. Detailed Implementation

[0017] like Figure 1As shown, a vertical high-pressure heater manhole door disassembly device includes a frame 1. A telescopic cylinder 2 is located at the bottom of the frame 1, with its telescopic end facing upwards. The telescopic end of the cylinder 2 is connected to a manhole seat 3 via a connecting sleeve. The telescopic cylinder 2 is connected to a hydraulic operating pump 5 via a hydraulic oil pipe 4. A support member 6 is mounted on the frame 1. When disassembling the manhole door, this device is first placed below the manhole door. The fixing bolts on the manhole door cover are then removed. When only two fixing bolts remain, the device will be positioned directly below the manhole door, ensuring that the manhole door cover falls onto the device. The frame 1 of this device will act as a support, preventing the manhole door cover from falling to the ground and being damaged, thus affecting its reuse. Due to water pressure, the high-pressure heater self-sealing block located in the manhole door will shift downwards, squeezing the quarter-ring gasket and making it difficult to remove. This device uses a telescopic cylinder 2 to lift the high-pressure heater self-sealing block, creating space for the removal of the quarter-ring gasket, allowing technicians to easily remove it. After removing the quarter-ring gasket, the manhole seat 3 is connected to the high-pressure heater self-sealing block with bolts, causing the telescopic cylinder 2 to move downwards. The high-pressure heater self-sealing block is then disassembled through the manhole seat 3, finally completing the disassembly of the manhole door.

[0018] The manhole seat 3 is disc-shaped, and the high-pressure self-sealing block is also disc-shaped. This aligns the central axis of the manhole seat 3 with the central axis of the high-pressure self-sealing block, preventing the telescopic cylinder 2 from deviating during lifting and increasing the difficulty of removing the quarter-ring gasket. The manhole seat 3 has several connecting holes 31, evenly distributed along its circumference. The manhole seat 3 connects to the high-pressure self-sealing block via these connecting holes 31. The high-pressure self-sealing block has threaded holes evenly distributed along its circumference. The connecting holes 31 correspond one-to-one with the threaded holes, thus aligning the central axis of the manhole seat 3 with the central axis of the high-pressure self-sealing block, preventing force deviation during the retraction of the telescopic cylinder 2, and improving disassembly efficiency.

[0019] The support member 6 includes a support column 61 and a support ring 62. The support column 61 has external threads, and the support ring 62 has internal threads. The support column 61 and the support ring 62 are threadedly connected. To ensure uniform force distribution on the high-pressure self-sealing block, the manhole seat 3 needs to be kept horizontal. The horizontality of the manhole seat 3 can be adjusted by adjusting the relative positions of the support column 61 and the support ring 62. The support member 6 also provides support force to the frame 1 to withstand the force that drives the high-pressure self-sealing block when the telescopic cylinder 2 retracts downward, making the frame 1 more stable.

[0020] The telescopic cylinder 2 has a threaded portion on its telescopic end, with external threads on the threaded portion. The manhole seat 3 has a fixing hole. One end of the connecting sleeve is threadedly connected to the telescopic end of the telescopic cylinder, and the other end is connected to the fixing hole of the manhole seat 3. The fixing hole has internal threads. The threaded connection prevents the manhole seat 3 from falling off the connecting sleeve and causing danger.

[0021] The frame 1 is square, with two reinforcing ribs 11 on it. A guide 12 is provided between the two reinforcing ribs 11, and a telescopic cylinder 2 is connected to the guide 12. The guide 21 has a guide hole through which the telescopic end of the telescopic cylinder 2 passes, ensuring the movement trajectory of the telescopic end of the telescopic cylinder 2. The bottom of the frame 1 has multiple supporting feet. The frame 1 includes uprights 13 and multiple crossbeams 14. Four crossbeams 14 are connected end to end to form a top support frame, and another four crossbeams 14 are connected end to end to form a bottom support frame. The top support frame and the bottom support frame are connected by uprights 13, and the uprights 13 have reinforcing beams 15 to increase the strength of the frame 1.

[0022] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A disassembly device for a manhole door of a vertical high-pressure heater, characterized in that, The device includes a frame, with a telescopic cylinder at the bottom of the frame. The telescopic end of the telescopic cylinder is connected to a manhole seat via a connecting sleeve. The telescopic cylinder is connected to a hydraulic operating pump via a hydraulic oil pipe. Support components are mounted on the frame.

2. The vertical high-pressure heater manhole door disassembly device according to claim 1, characterized in that, The manhole seat is disc-shaped and has several connecting holes; the connecting holes are evenly distributed along the circumference of the manhole seat.

3. The vertical high-pressure heater manhole door disassembly device according to claim 1, characterized in that, The support component includes a support column and a support ring. The support column has external threads, and the support ring has internal threads. The support column and the support ring are threadedly connected.

4. The vertical high-pressure heater manhole door disassembly device according to claim 1, characterized in that, The telescopic cylinder has a threaded part on its telescopic end, and the threaded part has an external thread. The manhole seat has a fixing hole. One end of the connecting sleeve is threadedly connected to the telescopic end of the telescopic cylinder, and the other end is connected to the fixing hole of the manhole seat. The fixing hole has an internal thread.

5. The vertical high-pressure heater manhole door disassembly device according to claim 1, characterized in that, The frame is square and has two reinforcing ribs. A guide is provided between the two reinforcing ribs, and a telescopic cylinder is connected to the guide. The guide has a guide hole, and the telescopic end of the telescopic cylinder passes through the guide hole.

6. The vertical high-pressure heater manhole door disassembly device according to claim 1, characterized in that, The frame has multiple support feet at its bottom.

7. The vertical high-pressure heater manhole door disassembly device according to claim 1, characterized in that, The frame includes uprights and multiple crossbeams. Four crossbeams are connected end to end to form a top support frame, and another four crossbeams are connected end to end to form a bottom support frame. The top support frame and the bottom support frame are connected by uprights.

8. The vertical high-pressure heater manhole door disassembly device according to claim 7, characterized in that, The upright is equipped with a reinforcing beam.

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