Positioning device for on-line replacement of radiation-resistant valve guide rail

Abstract

The utility model belongs to the technical field of valves, and particularly relates to a positioning device for on-line replacement of an irradiation-resistant valve guide rail. Comprising a positioning plate, a stand column, a connecting plate, a handle, a lead screw support, a hand wheel, a lead screw, a connecting block, a connecting rod and a guide rail guiding device, 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, and the lead screw support is installed on the connecting plate. The lead screw is fixed to the lead screw support, the lower end of the lead screw is installed on the positioning plate, the hand wheel is installed at the top end of the lead screw, the connecting block is installed on the lead screw, and the connecting rod is connected with the connecting block. The utility model has the beneficial effects that the sealing surface of the valve seat of the gate valve is taken as an installation reference, the positioning deflection of the valve guide rail is effectively prevented, the gate plate is ensured to keep centering when pressing the valve seat, and the gate plate and the valve seat are fully attached to realize sealing.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically relating to a positioning device for online replacement of radiation-resistant valve guide rails. Background Technology

[0002] Nuclear power plants primarily use welded valves to control the flow of fluids such as steam, water, and radioactive media during operation. When the valve seats of these valves are severely damaged, replacement is usually performed, i.e., cutting the damaged valve from the pipeline and welding a new one. However, due to the large number of valves that need to be replaced, the replacement cost is substantial. Therefore, online valve seat replacement is being considered for repair. Online valve seat replacement can save significant amounts of money and time, reduce damage to the pipeline from cutting, and decrease the number of expensive spare valve parts required.

[0003] During valve repair, after removing the old guide rails on both sides of the valve body, the new guide rails must be accurately fixed before welding can proceed. The accuracy of the new guide rail positioning affects the valve's sealing performance, and in severe cases, can cause valve disc jamming during opening and closing, reducing valve life. Due to the limited space within the valve body cavity, there has been no good assembly method to ensure the installation accuracy of the two guide rails during welding. Therefore, a positioning device for online replacement of radiation-resistant valve guide rails is needed. The existing technology, "An Installation Device for Guide Ribs of a Wedge-Type Forged Gate Valve" (Patent No.: CN218523059U), suffers from low positioning accuracy and complex operation, with the following specific problems:

[0004] (1) The installation device is not related to the valve seat, and it cannot be guaranteed that the gate and the valve seat will fit completely after the valve guide rail is installed, which affects the sealing.

[0005] (2) The installation device cannot ensure that the valve guide rail is tightly attached to the valve body, which affects the subsequent welding process. Utility Model Content

[0006] The purpose of this invention is to provide a positioning device for online replacement of radiation-resistant valve guide rails, which features high positioning accuracy, convenient installation, and reduced radiation dose to operators.

[0007] The technical solution of this utility model is as follows: A positioning device for online replacement of radiation-resistant valve guide rails includes a positioning plate, a column, a connecting plate, a handle, a lead screw support, a handwheel, a lead screw, a connecting block, a connecting rod, and a guide rail guiding device. The positioning plate is placed on the valve seat, the column is mounted on the positioning plate, the connecting plate is mounted on the column, the handle is mounted on the connecting plate, the lead screw support is mounted on the connecting plate, the lead screw is fixed on the lead screw support, the lower end of the lead screw is mounted on the positioning plate, the handwheel is mounted on the top end of the lead screw, the connecting block is mounted on the lead screw, and the connecting rod is connected to the connecting block.

[0008] The guide rail guiding device includes a guide rod, a guide rail baffle, a guide rail positioning plate, and an elastic cylindrical pin. The guide rail positioning plate is hinged to a connecting rod via a pin. The guide rod is slidably connected to a column via a linear bearing. The guide rod is fixed to the guide rail positioning plate by fasteners. The guide rail baffle is installed on the guide rail positioning plate. The guide rail is installed on the guide rail positioning plate via an elastic cylindrical pin.

[0009] The positioning plate cooperates with the valve seat to ensure the installation accuracy of the valve guide rail.

[0010] The lead screw is a positive and negative threaded lead screw. Rotating the lead screw causes the upper and lower connecting blocks to separate, which in turn drives the guide rail positioning plate to open and fix the valve guide rail on the valve body.

[0011] The elastic cylindrical pin is used to position the guide rail, and also facilitates the retraction of the guide rail positioning plate and removal of the guide rail positioning device after the guide rail welding is completed.

[0012] The column is mounted on the positioning plate and secured with screws.

[0013] The handle is mounted on the connecting plate by fasteners and is used for positioning and moving the device.

[0014] The lead screw is fixed to the lead screw support by a lead screw nut.

[0015] The lower end of the lead screw is mounted on the positioning plate via a collar.

[0016] The connecting rod is hinged to the connecting block via a pin.

[0017] The beneficial effects of this utility model are as follows: This utility model uses the sealing surface of the gate valve seat as the installation reference, effectively preventing misalignment of the valve guide rail, ensuring that the gate plate remains aligned when pressing against the valve seat, and allowing the gate plate and valve seat to fully fit together to achieve a seal. The valve guide rail is tightly pressed and fixed to the inner surface of the valve body through mechanical transmission components, preparing for subsequent welding processes. Attached Figure Description

[0018] Figure 1 This is an installation diagram of a positioning device for online replacement of radiation-resistant valve guide rails provided by this utility model.

[0019] Figure 2 This is a schematic diagram of the positioning device for online replacement of radiation-resistant valve guide rails provided by this utility model;

[0020] Figure 3 This is a schematic diagram of the guide rail guiding device.

[0021] In the diagram: 1 Valve body, 2 Valve seat, 3 Positioning plate, 4 Column, 5 Connecting plate, 6 Handle, 7 Screw support, 8 Handwheel, 9 Screw, 10 Connecting block, 11 Connecting rod, 12 Linear bearing, 13 Guide rail guiding device, 131 Guide rod, 132 Guide rail baffle, 133 Guide rail positioning plate, 134 Elastic cylindrical pin. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] The present invention provides a positioning device for online replacement of radiation-resistant valve guide rails. The object operated is a gate valve, which includes a valve body 1 and a valve seat 2, and the valve guide rail is installed on the valve body 1.

[0024] like Figure 2 As shown, a positioning device for online replacement of radiation-resistant valve guide rails includes a positioning plate 3, a column 4, a connecting plate 5, a handle 6, a lead screw support 7, a handwheel 8, a lead screw 9, a connecting block 10, a connecting rod 11, a linear bearing 12, and a guide rail guiding device 13. The positioning plate 3 is placed on a valve seat 2, and the column 4 is mounted on the positioning plate 3 and secured with screws. The connecting plate 5 is mounted on the column 4, and the handle 6 is mounted on the connecting plate 5 with fasteners, allowing for the movement of the positioning device. The lead screw support 7 is mounted on the connecting plate 5, and the lead screw 9 is fixed to the lead screw support 7 by a lead screw nut. The lower end of the lead screw 9 is mounted on the positioning plate 3 via a collar, and the handwheel 8 is mounted on the top end of the lead screw 9. The connecting block 10 is mounted on the lead screw 9, and the connecting rod 11 is hinged to the connecting block 10 via a pin.

[0025] Specifically, the guide rail guiding device 13 includes a guide rod 131, a guide rail baffle 132, a guide rail positioning plate 133, and an elastic cylindrical pin 134. The guide rail positioning plate 133 is hinged to the connecting rod 11 via a pin. The guide rod 131 is slidably connected to the column 4 via the linear bearing 12. The guide rod 131 is fixed to the guide rail positioning plate 133 by fasteners, the guide rail baffle 132 is mounted on the guide rail positioning plate 133, and the guide rail is mounted on the guide rail positioning plate 133 via the elastic cylindrical pin 134.

[0026] Specifically, the valve seat 2 cooperates with the positioning plate 3 to ensure the installation accuracy of the valve guide rail.

[0027] Specifically, the lead screw 9 is a screw with both positive and negative threads. Rotating the lead screw causes the upper and lower connecting blocks 10 to separate, further driving the guide rail positioning plate 133 to open and fix the valve guide rail to the valve body 1.

[0028] Specifically, the elastic cylindrical pin 134 is used to position the guide rail, and at the same time facilitates the retraction of the guide rail positioning plate 133 and the removal of the guide rail positioning device after the guide rail welding is completed.

[0029] In use, the valve guide rail is installed onto the guide rail positioning plate 134 via the elastic cylindrical pin 134. The operator inserts the positioning device into the valve body using the handle 6, and the positioning plate 3 and valve seat 2 are positioned and engaged. Rotating the handwheel 8 drives the connecting block 10 via the lead screw 9 to open the guide rail positioning plate 133, so that the valve guide rail is tightly attached to the valve seat 2.

[0030] In use, after the valve guide rail is welded, the handwheel 8 is rotated to retract the guide rail positioning plate 133. At this time, the elastic cylindrical pin 134 remains fixed on the guide rail positioning plate 133. The operator pulls the positioning device out of the valve body 2 using the handle 6.

[0031] The above-described specific embodiments are only used to explain the design concept of this utility model, and their purpose is to facilitate understanding and implementation by those skilled in the art. They are not intended to limit the scope of protection of this utility model. Therefore, any equivalent changes made using the design concept of this utility model still fall within the protection scope of this utility model.

Claims

1. A positioning device for online replacement of radiation-resistant valve guide rails, characterized in that: The device includes a positioning plate, a column, a connecting plate, a handle, a lead screw support, a handwheel, a lead screw, a connecting block, a connecting rod, and a guide rail. The positioning plate is placed on the valve seat, the column is mounted on the positioning plate, the connecting plate is mounted on the column, the handle is mounted on the connecting plate, the lead screw support is mounted on the connecting plate, the lead screw is fixed on the lead screw support, the lower end of the lead screw is mounted on the positioning plate, the handwheel is mounted on the top end of the lead screw, the connecting block is mounted on the lead screw, and the connecting rod is connected to the connecting block.

2. The positioning device for online replacement of radiation-resistant valve guide rails as described in claim 1, characterized in that: The guide rail guiding device includes a guide rod, a guide rail baffle, a guide rail positioning plate, and an elastic cylindrical pin. The guide rail positioning plate is hinged to a connecting rod via a pin. The guide rod is slidably connected to a column via a linear bearing. The guide rod is fixed to the guide rail positioning plate by fasteners. The guide rail baffle is installed on the guide rail positioning plate. The guide rail is installed on the guide rail positioning plate via an elastic cylindrical pin.

3. The positioning device for online replacement of radiation-resistant valve guide rails as described in claim 1, characterized in that: The positioning plate cooperates with the valve seat to ensure the installation accuracy of the valve guide rail.

4. The positioning device for online replacement of radiation-resistant valve guide rails as described in claim 2, characterized in that: The lead screw is a positive and negative threaded lead screw. Rotating the lead screw causes the upper and lower connecting blocks to separate, which in turn drives the guide rail positioning plate to open and fix the valve guide rail on the valve body.

5. A positioning device for online replacement of radiation-resistant valve guide rails as described in claim 2, characterized in that: The elastic cylindrical pin is used to position the guide rail, and also facilitates the retraction of the guide rail positioning plate and removal of the guide rail positioning device after the guide rail welding is completed.

6. The positioning device for online replacement of radiation-resistant valve guide rails as described in claim 1, characterized in that: The column is mounted on the positioning plate and secured with screws.

7. A positioning device for online replacement of radiation-resistant valve guide rails as described in claim 1, characterized in that: The handle is mounted on the connecting plate by fasteners and is used for positioning and moving the device.

8. The positioning device for online replacement of radiation-resistant valve guide rails as described in claim 1, characterized in that: The lead screw is fixed to the lead screw support by a lead screw nut.

9. A positioning device for online replacement of radiation-resistant valve guide rails as described in claim 1, characterized in that: The lower end of the lead screw is mounted on the positioning plate via a collar.

10. A positioning device for online replacement of radiation-resistant valve guide rails as described in claim 1, characterized in that: The connecting rod is hinged to the connecting block via a pin.

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