CN-224223079-U - Positioning device for online replacement of irradiation-resistant valve guide rail

Abstract

The utility model belongs to the technical field of valves, and particularly relates to a positioning device for online replacement of an irradiation-resistant valve guide rail. Including locating plate, stand, connecting plate, handle, lead screw support, hand wheel, lead screw, connecting block, connecting rod and guide rail guider, the locating plate place on the disk seat, the stand is installed on the locating plate, the connecting plate is installed on the stand, the handle is installed on the connecting plate, the lead screw support is installed on the connecting plate, the lead screw is fixed on the lead screw support, the lead screw lower extreme is installed on the locating plate, the hand wheel is installed on the lead screw top, the connecting block is installed on the lead screw, the connecting rod is connected with the connecting block. The gate valve has the beneficial effects that the sealing surface of the gate valve seat is used as a mounting reference, so that the positioning deflection of the valve guide rail is effectively prevented, the gate plate is ensured to keep neutral when the gate plate presses the valve seat, and the gate plate is fully attached to the valve seat, thereby realizing sealing.

Inventors

• ZANG JIALIN
• WANG SHUANGJIAN
• Ju Yanxu
• WU QI
• Qu Lvhu
• WANG WEI
• YU SONG
• WANG BIN
• ZHOU WEN
• YANG ZIHAO

Assignees

• 核电运行研究(上海)有限公司
• 江苏核电有限公司
• 海南核电有限公司
• 北京雷蒙赛博核装备技术研究有限公司

Dates

Publication Date

20260512

Application Date

20250429

Claims (10)

1. 1. The positioning device for the irradiation-resistant valve guide rail online replacement is characterized by comprising a positioning plate, a stand column, a connecting plate, a handle, a screw support, a hand wheel, a screw, a connecting block, a connecting rod and a guide rail guiding device, wherein the positioning plate is placed on a valve seat, the stand column is installed on the positioning plate, the connecting plate is installed on the stand column, the handle is installed on the connecting plate, the screw support is installed on the connecting plate, the screw is fixed on the screw support, the lower end of the screw is installed on the positioning plate, the hand wheel is installed at the top end of the screw, the connecting block is installed on the screw, and the connecting rod is connected with the connecting block.
2. 2. The irradiation-resistant valve guide rail online replacement positioning device according to claim 1, wherein the guide rail guiding device comprises a guide rod, a guide rail baffle plate, a guide rail positioning plate and an elastic cylindrical pin, the guide rail positioning plate is hinged with the connecting rod through a pin shaft, the guide rod is in sliding connection with the upright post through a linear bearing, the guide rod is fixed on the guide rail positioning plate through a fastener, the guide rail baffle plate is arranged on the guide rail positioning plate, and the guide rail is arranged on the guide rail positioning plate through the elastic cylindrical pin.
3. 3. The irradiation-resistant valve guide on-line replacement positioning device according to claim 1, wherein the positioning plate is matched with the valve seat to ensure the installation accuracy of the valve guide.
4. 4. The irradiation-resistant valve guide rail online replacement positioning device according to claim 2, wherein the screw is a positive and negative threaded screw, the screw is rotated to drive the upper connecting block and the lower connecting block to be separated, and the guide rail positioning plate is further driven to be spread, so that the valve guide rail is fixed on the valve body.
5. 5. The irradiation-resistant valve guide rail online replacement positioning device according to claim 2, wherein the elastic cylindrical pin is used for positioning the guide rail, and simultaneously, the guide rail positioning plate is contracted after the guide rail is welded, and the guide rail positioning device is taken out.
6. 6. The irradiation-resistant valve guide on-line replacement positioning device according to claim 1, wherein the upright is mounted on the positioning plate and fastened by screws.
7. 7. The irradiation-resistant valve guide on-line replacement positioning device according to claim 1, wherein the handle is mounted on the connecting plate through a fastener for carrying by the positioning device.
8. 8. The irradiation-resistant valve guide on-line replacement positioning device of claim 1, wherein the screw is fixed on the screw support through a screw nut.
9. 9. The irradiation-resistant valve guide rail on-line replacement positioning device according to claim 1, wherein the lower end of the screw rod is mounted on the positioning plate through a collar.
10. 10. The irradiation-resistant valve guide rail online replacement positioning device according to claim 1, wherein the connecting rod is hinged with the connecting block through a pin shaft.

Description

Positioning device for online replacement of irradiation-resistant valve guide rail Technical Field The utility model belongs to the technical field of valves, and particularly relates to a positioning device for online replacement of an irradiation-resistant valve guide rail. Background During operation, nuclear power plants mainly use welded-on valves to control the flow of fluids such as steam, water, and radioactive media. When the valve seat of such valves is severely damaged, a replacement process is typically employed, i.e., cutting the damaged valve from the pipeline and then welding a new valve. However, because the number of the whole valves is large and the replacement cost is large, the valve seat is considered to be repaired in an online replacement mode, a large amount of funds and time can be saved by online replacement of the valve seat, the damage of cutting to the pipeline is reduced, and the number of expensive whole valve spare parts is reduced. When the valve is repaired, after the old guide rails on the two sides of the valve body are removed, the welding operation can be performed only after the new guide rails are accurately fixed. The tightness of the valve is affected by the positioning and mounting precision of the new guide rail, and the valve clack is blocked in the opening and closing process of the valve when severe, so that the service life of the valve is shortened. Because the valve body cavity space is narrow, no good assembly method is available in the valve guide rail welding process to ensure the installation accuracy of the two guide rails, and therefore, the positioning device for the irradiation-resistant valve guide rail online replacement is required. The 'installation device of wedge type forging gate valve guide bar' in the prior art (patent number: CN 218523059U) has low positioning precision and complex operation, and the specific problems are as follows: (1) The installation device is not related to the valve seat, so that the flashboard and the valve seat are completely attached to influence sealing after the valve guide rail is installed. (2) The mounting device cannot ensure that the valve guide rail is tightly attached to the valve body, and the subsequent welding process is affected. Disclosure of utility model The utility model aims to provide a positioning device for online replacement of a radiation-resistant valve guide rail, which has the characteristics of high positioning precision and convenience in installation and reduces radiation dose of operators. The technical scheme is that the positioning device for the online replacement of the irradiation-resistant valve guide rail comprises a positioning plate, a stand column, a connecting plate, a handle, a screw support, a hand wheel, a screw, a connecting block, a connecting rod and a guide rail guiding device, wherein the positioning plate is placed on a valve seat, the stand column is arranged on the positioning plate, the connecting plate is arranged on the stand column, the handle is arranged on the connecting plate, the screw support is arranged on the connecting plate, the screw is fixed on the screw support, the lower end of the screw is arranged on the positioning plate, the hand wheel is arranged at the top end of the screw, the connecting block is arranged on the screw, and the connecting rod is connected with the connecting block. The guide rail guiding device comprises a guide rod, a guide rail baffle, a guide rail positioning plate and an elastic cylindrical pin, wherein the guide rail positioning plate is hinged with the connecting rod through a pin shaft, the guide rod is in sliding connection with the upright post through a linear bearing, the guide rod is fixed on the guide rail positioning plate through a fastener, the guide rail baffle is arranged on the guide rail positioning plate, and the guide rail is arranged on the guide rail positioning plate through the elastic cylindrical pin. The locating plate is matched with the valve seat, so that the installation accuracy of the valve guide rail is guaranteed. The lead screw is a positive and negative thread lead screw, the lead screw is rotated to drive the upper connecting block and the lower connecting block to be separated, and the guide rail positioning plate is further driven to be spread, so that the guide rail of the valve is fixed on the valve body. The elastic cylindrical pins are used for positioning the guide rails, and meanwhile, the guide rails can be contracted after the guide rails are welded, and the guide rail positioning device is taken out. The upright posts are arranged on the positioning plate and fastened by screws. The handle is installed on the connecting plate through a fastener and used for carrying the positioning device. The screw is fixed on the screw support through a screw nut. The lower end of the screw rod is arranged on the positioning plate through a collar. The connecting rod is hinged with the con