CN216000040U

CN216000040U - High-pressure combined steam valve seal autonomous grinding tool for 500MW steam turbine

Info

Publication number: CN216000040U
Application number: CN202121892798.7U
Authority: CN
Inventors: 郑鸿程; 于文波; 李凤超; 王志强; 张恒阳
Original assignee: Huaneng Yimin Coal and Electricity Co Ltd
Current assignee: Huaneng Yimin Coal and Electricity Co Ltd
Priority date: 2021-08-13
Filing date: 2021-08-13
Publication date: 2022-03-11
Anticipated expiration: 2031-08-13

Abstract

The utility model relates to a high-pressure combined steam valve seal autonomous grinding tool for a 500MW steam turbine. In the process of valve maintenance, the abrasive cloth oilstone is used for grinding in a better state after manually removing oxide skin, and the poor abrasive cloth oilstone is returned to a factory for treatment or outsourcing for professional team grinding and repairing, so that the valve maintenance method is high in price and long in construction period. The utility model provides a 500MW steam turbine high pressure is united steam valve and is sealed independently grinding frock, its constitution includes: the fixed cover frame of transmission shaft (1) and cross, the top and the hand-held motor (2) interface connection of transmission shaft, the bottom of transmission shaft is connected with connector (3) that have a helicitic texture, the fixed cover frame of cross comprises a section of thick bamboo (4) and cross roof beam (5) of inserting, cross roof beam with insert a section of thick bamboo structure as an organic whole, and inserted a section of thick bamboo and inserted the transmission shaft, round hole (6) have been seted up on the face of cross roof beam, the round hole inserts in connecting bolt (8) of door closure flange (7) department. The utility model is applied to the fields of thermal power plants, chemical industry and the like.

Description

High-pressure combined steam valve seal autonomous grinding tool for 500MW steam turbine

Technical Field

The utility model relates to a high-pressure combined steam valve seal autonomous grinding tool for a 500MW steam turbine.

Background

At present, the temperature of a medium of a combined steam valve is about 540 ℃, the pressure is 24MPa, and higher reliability and tightness are required. The valve seat is made of hot-sleeve hard alloy, the valve core is designed to be a spherical surface, and the valve core is provided with a pre-opening function. The valve core and the valve seat are in a sealing structure of a tangent line of a valve curve surface. In general disassembly and maintenance, the manual descaling is adopted, the abrasive cloth oilstone is used for grinding in a good state, the poor abrasive cloth oilstone is returned to a factory for treatment or outsourcing carries out professional team grinding and repairing, the cost is high, and the construction period is long. Resulting in wasted capital. If the red powder stamping inspection effect of the sealing surface is poor and the sealing line is not consistent, the production operation requirement cannot be met.

In the process of valve maintenance, the abrasive cloth oilstone is used for grinding in a better state after manually removing oxide skin, and the poor abrasive cloth oilstone is returned to a factory for treatment or outsourcing for professional team grinding and repairing, so that the valve maintenance method is high in price and long in construction period.

Because the valve disintegrates the back, the case can be taken out, utilizes the fixed sealed face of clearing up of support, and the disk seat is inlayed and is overlapped the bottom in the valve door body, takes out and needs the destructiveness to demolish the change, generally carries out the inside on the spot maintenance grinding of door. The joint surface of the valve cover is larger, the large-capacity high-pressure valve can be maximally 700mm lower than the valve cover in the valve, the space is narrow, and the difficulty of measurement, maintenance and grinding is larger.

Disclosure of Invention

The utility model aims to provide a high-pressure combined steam valve seal autonomous grinding tool for a 500MW steam turbine.

The above purpose is realized by the following technical scheme:

the utility model provides a 500MW steam turbine high pressure is united steam valve and is sealed independently grinding frock, its constitution includes: the transmission shaft and the cross fixing sleeve frame are connected with the interface of the handheld motor, the bottom of the transmission shaft is connected with a connector with a threaded structure, the cross fixing sleeve frame is composed of an inserting cylinder and a cross beam, the cross beam and the inserting cylinder are of an integrated structure, the inserting cylinder is internally inserted with the transmission shaft, the plate surface of the cross beam is provided with a round hole, and the round hole is inserted into a connecting bolt at the flange of the door cover.

The high-pressure joint steam valve of the 500MW steam turbine seals and independently grinds the frock, the connector pass the threaded hole of the upper fixing nut, the clamping fixture disc and the lower fixing nut.

The utility model has the beneficial effects that:

1. the utility model can be used by matching two sets of clamping tools, and when a plurality of valves are overhauled, one grinding outer arc surface and one grinding inner arc surface can be alternately used, thereby improving the efficiency.

The utility model can be adjusted or sleeved with a small clamping fixture along with the inner diameter of the valve and the depth of the grinding surface, can be adjusted at any time and is universal at multiple places.

The utility model can carry out checking and correction at any time while grinding, and has higher matching degree. The cost is low, and the on-site independent maintenance and grinding are realized. If the sand hole appears, when the mar is great, can carry out argon arc repair welding back, when polishing to slightly high 0.20mm about, use this frock mould to continue to grind, the impression inspection can guarantee whole week continuous seal line. Convenient adjustment, higher precision, good operability, safety and high efficiency.

After the combined tool set is designed and used, the maintenance and grinding requirements of the spherical sealing surface of the installed high-pressure valve in a production field can be met, the application range is wide, and the problems that the grinding amount is difficult to control manually and the grinding amount of the sealing surface is uneven to cause missing deformation, the integral attachment cannot be achieved, and the sealing is guaranteed are solved. The adjustable grinding speed can be realized, the grinding material can be checked and replaced at any time, the accurate attaching position of the grinding material and the corresponding matching surface can be completely kept, and the success rate is high. The problems of time and labor consumption and low efficiency in maintenance and poor safety are solved. Each machine can save 30 ten thousand yuan of outsourcing or returning funds.

According to the utility model, two mould discs with sizes and radians designed according to the original factory are matched with a grinding surface in an attaching manner, and an adjustable rotary transmission shaft is designed and installed in combination with the structural depth, so that the transmission shaft and the mould discs are detachably assembled and locked according to the rotating direction. A cross fixing sleeve frame is sleeved on the transmission shaft and consists of an inserting cylinder and a cross beam, the cross beam is fixed through a connecting bolt at the flange face of the door cover, namely the cross beam is sleeved, and the door cover bolt is used for adjusting and fixing the grinding tool. And a connector matched with the low-speed dissimilar motor is designed and processed at the top of the transmission shaft. And the electric grinding work of two arc-shaped (inner arc and outer arc) sealing surfaces of the valve is automatically carried out by matching with grinding materials such as cleaning agents, grinding paste, self-adhesive abrasive cloth and the like.

Description of the drawings:

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of a cross fixing sleeve frame.

FIG. 3 is a die disc configuration for grinding a valve seat.

Fig. 4 is a die disc structure for a grinding valve head.

In the figure: 1. the device comprises a transmission shaft, 2, a handheld motor, 3, a connector, 4, an insertion cylinder, 5, a cross beam, 6, a round hole, 7, a door cover flange, 8, a connecting bolt, 9, an upper fixing nut, 10, a lower fixing nut, 11 and a mould disc.

The specific implementation mode is as follows:

example 1:

the utility model provides a 500MW steam turbine high pressure is united steam valve and is sealed independently grinding frock, its constitution includes: the fixed cover frame of transmission shaft 1 and cross, the top and the 2 interface connections of handheld motor of transmission shaft, the bottom of transmission shaft be connected with connector 3 that has a helicitic texture, the fixed cover frame of cross constitute by inserting a section of thick bamboo 4 and cross roof beam 5, the cross roof beam with insert a section of thick bamboo structure as an organic whole, just insert a section of thick bamboo in insert the transmission shaft, the face of cross roof beam on seted up round hole 6, the round hole insert in the connecting bolt 8 of door closure flange 7 department.

Example 2:

according to the high-pressure combined steam valve sealing automatic grinding tool for the 500MW steam turbine, in the embodiment 1, the connector penetrates through the threaded holes 10 of the upper fixing nut 9, the clamping fixture disc 11 and the lower fixing nut.

Claims

1. The utility model provides a 500MW steam turbine high pressure is united steam valve and is sealed independently grinding frock, its constitution includes: fixed cover frame of transmission shaft and cross, characterized by: the top and the handheld motor interface connection of transmission shaft, the bottom of transmission shaft be connected with the connector that has the helicitic texture, the fixed cover frame of cross constitute by inserting a section of thick bamboo and cross beam, the cross beam with insert a section of thick bamboo structure as an organic whole, just insert a section of thick bamboo in insert the transmission shaft, the face of cross beam on seted up the round hole, the round hole insert in the connecting bolt of door closure flange department.

2. The 500MW steam turbine high-pressure combined steam valve seal autonomous grinding tool as claimed in claim 1, characterized in that: the connector passes through the threaded holes of the upper fixing nut, the clamping fixture disc and the lower fixing nut.