Nuclear power plant large-diameter wedge gate valve blue oil test device and test method thereof

Abstract

The invention relates to the technical field of valve inspection and maintenance, in particular to a large-diameter wedge gate valve blue oil test device and a test method thereof.The device comprises a rack, a clamping module and a driving module, the rack is used for supporting and fixing the device, the driving module is arranged in the middle of the rack, and the driving module is connected with a gate plate and drives the gate plate to move along a piston rod; the clamping modules are arranged on the two sides of the rack, the clamping modules are used for achieving fixed connection of the device and the valve, each clamping module comprises a clamping jaw and a clamping jaw locking bolt, and the clamping jaws are fixed to the two sides of the rack through the clamping jaw locking bolts. The device adopts a modular design, can be equipped with clamping jaws and flashboard connecting rods with different specifications and sizes to adapt to valves with different calibers / strokes / flashboard sizes, and is convenient to disassemble, assemble and replace.

Description

Technical Field

[0001] The invention relates to the technical field of valve inspection and maintenance, and in particular to a blue oil testing device for a large-caliber wedge-type gate valve and a testing method thereof. Background Art

[0002] The valve body type of the main steam isolation valve of most domestic nuclear power plants is a wedge-type gate valve. The sealing of this type of valve is achieved by the contact between the gate and the valve seat. After dismantling and repairing, the sealing performance between the gate and the valve seat is generally tested by a blue oil test. When conducting a blue oil test, first apply blue oil to the sealing surface of the gate, then use a certain pressure to make the gate and the valve seat sealing surface completely fit, and finally move the gate out of the valve body and observe the distribution of blue oil on the gate sealing surface to judge the valve sealing performance.

[0003] In the prior art, if the movement process of fitting and separating the gate and the valve seat is carried out by manpower, hoisting or manual devices, it is easy to cause unstable clamping, inaccurate centering of the gate and the valve seat, insufficient test driving force, and the test is difficult to succeed in one time and the operation is laborious. At the same time, it is also possible that the gate and the valve seat are difficult to separate after fitting due to insufficient reverse driving force. Summary of the invention

[0004] The invention provides a blue oil test device and a test method for a large-caliber wedge-type gate valve, which are used to solve the problems of unstable clamping, inaccurate centering of a gate plate and a valve seat, and insufficient test driving force when performing a blue oil test in the prior art.

[0005] The technical solution of the present invention is as follows:

[0006] The present invention proposes a blue oil test device for a large-caliber wedge-type gate valve in a nuclear power plant. The device comprises a frame, a clamping module and a driving module. The frame is used to support and fix the device. The driving module is arranged in the middle of the frame. The driving module is connected to a gate plate to drive the gate plate to move along a piston rod. The clamping modules are arranged on both sides of the frame. The clamping modules are used to realize a fixed connection between the device and the valve. The clamping modules comprise clamping claws and clamping claw locking bolts. The clamping claws are fixed to both sides of the frame by the clamping claw locking bolts.

[0007] In some embodiments, the frame adopts a beam structure, and sliding grooves are provided at the connection between the two sides of the frame and the clamping claws, allowing the clamping claws to slide along the direction of the sliding grooves.

[0008] In some embodiments, the clamping module further includes a centering adjustment bolt, the clamping jaw 6 is clamped on the concave annular surface at the top of the valve body, and the centering adjustment bolt and the clamping jaw locking bolt jointly fix the clamping jaw and the frame.

[0009] In some embodiments, the drive module includes a double-acting hydraulic cylinder, a piston rod, a quick-release locating pin and a gate connecting rod. The piston rod runs through the middle of the frame, a double-acting hydraulic cylinder is provided at the top of the piston rod, and a gate connecting rod is provided at the lower end of the piston rod. The piston rod is fixed to the gate connecting rod by a quick-release locating pin.

[0010] In some embodiments, the end of the gate connecting rod is provided with an interface adapted to the connection interface of the gate.

[0011] The present invention proposes a blue oil test method for large-caliber wedge-type gate valves in nuclear power plants, which is characterized in that the method comprises:

[0012] Step 1: Connect and fix the gate connecting rod of the driving module to the gate;

[0013] Step 2: Apply blue oil on the gate sealing surface;

[0014] Step 3: Fix the clamping jaws of the clamping module to the valve;

[0015] Step 4: Start the double-acting hydraulic cylinder and conduct the valve blue oil test.

[0016] In some embodiments, step three specifically includes: loosening the center adjusting bolt and the clamp locking bolt, adjusting the clamp to a suitable position, completing the centering adjustment and installation of the clamping module on the valve body, and locking the centering adjusting bolt and the clamp locking bolt.

[0017] In some embodiments, step 4 specifically includes:

[0018] Step 4.1: Connect the double-acting hydraulic cylinder interface to the pump;

[0019] Step 4.2: Drive the piston rod to move forward to make the gate fit against the valve seat;

[0020] Step 4.3: Drive the piston rod to move in the opposite direction to separate the gate from the valve seat.

[0021] Step 4.4: Move the gate out of the valve body and observe the distribution of blue oil on the gate sealing surface to determine the valve sealing performance.

[0022] The implementation of the present invention has the following beneficial effects:

[0023] The present invention proposes a blue oil test device for a large-caliber wedge-type gate valve and a test method thereof. The device adopts a modular design and can be equipped with clamping jaws and gate connecting rods of different specifications and sizes to adapt to valves of different calibers / strokes / gate sizes, and is easy to disassemble, assemble and replace.

[0024] The present invention proposes a blue oil testing device for large-caliber wedge-type gate valves and a testing method thereof. The device is provided with a clamping module, which has reliable clamping and guiding and centering adjustment functions, thereby solving the problem of difficulty in centering by manpower or manual devices during gate movement.

[0025] The present invention proposes a blue oil test device for a large-caliber wedge-type gate valve and a test method thereof, which adopts hydraulic drive instead of human drive, reduces the labor intensity during the test, improves the quality of the blue oil test, and prevents the gate from being difficult to separate from the valve seat due to insufficient driving force. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a blue oil test device for a large-caliber wedge-type gate valve proposed in an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of the connection between a clamping module and a frame of a large-caliber wedge-type gate valve blue oil test device proposed in an embodiment of the present invention;

[0028] Figure 3 A schematic diagram of the connection between the piston rod and the gate connecting rod of a large-caliber wedge-type gate valve blue oil test device proposed in an embodiment of the present invention;

[0029] Figure 4 A schematic diagram of a blue oil test device for a large-caliber wedge-type gate valve and its connection with a valve according to an embodiment of the present invention;

[0030] Description of the drawings: 1. Double-acting hydraulic cylinder; 2. Frame; 3. Piston rod; 4. Quick-release locating pin; 5. Centering adjustment bolt; 6. Clamp; 7. Gate connecting rod; 8. Clamp locking bolt; 9. Gate; 10. Valve body. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is described clearly and completely below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] like Figures 1 to 4 As shown, the present invention proposes a blue oil test device for a large-caliber wedge-type gate valve in a nuclear power plant. The device includes a frame, a clamping module and a driving module. The frame is used to support and fix the device. The driving module is arranged in the middle of the frame. The driving module is connected to the gate plate to drive the gate plate to move along the piston rod; the clamping modules are arranged on both sides of the frame.

[0033] like Figure 2As shown, the frame 2 adopts a beam structure, which is used to support and fix other functional modules. Slide grooves are provided at the connection between the frame 2 and the clamping jaws 6 on both sides, allowing the clamping jaws 6 to slide along the slide groove direction to adapt to different valve calibers and also used for centering adjustment. Figure 2 shown.

[0034] like Figure 4 As shown, the clamping module is used to realize the fixed connection between the device and the valve. The clamping module includes a clamping jaw, a clamping jaw locking bolt 8 and a clamping jaw locking bolt. The clamping jaw is fixed to both sides of the frame by the clamping jaw locking bolt and the clamping jaw locking bolt 8. The device is clamped to the concave annular surface at the top of the valve body by the clamping jaw 6, and the relative position of the clamping jaw 6 and the frame 2 is locked by the centering adjustment bolt 5 and the clamping jaw locking bolt 8. The clamping jaw 6 can slide along the slide groove on the frame 2 for position adjustment. Before adjusting the position of the clamping jaw 6, loosen the centering adjustment bolt 5 and the clamping jaw locking bolt 8. After the position adjustment is completed, tighten the centering adjustment bolt 5 and the clamping jaw locking bolt 8.

[0035] like Figure 3 As shown, the drive module includes a double-acting hydraulic cylinder, a piston rod, a quick-release locating pin and a gate connecting rod. The piston rod runs through the middle of the frame. A double-acting hydraulic cylinder is provided at the top of the piston rod, and a gate connecting rod is provided at the lower end of the piston rod. The piston rod is fixed to the gate connecting rod by a quick-release locating pin. The drive module is connected to the gate 9, and is used to drive the gate 9 to move forward and reverse along the piston rod 3, so as to realize the fitting and separation process between the gate 9 and the valve seat during the blue oil experiment. This module is adapted to the connection interface of the gate through the end size structure of the gate connecting rod 7, and the gate connecting rod is connected to the gate. The device drives the piston rod 3 to move forward and reverse through the double-acting hydraulic cylinder 1, thereby driving the gate connecting rod 7 and the gate to move.

[0036] The present invention proposes a blue oil test method for a large-caliber wedge-type gate valve in a nuclear power plant, the method comprising:

[0037] Step 1: Connect and fix the gate connecting rod of the drive module to the gate.

[0038] Step 2: Apply blue oil on the gate sealing surface.

[0039] Step 3: Fix the clamping jaws of the clamping module to the valve, specifically including loosening the center adjusting bolt and the clamping jaw locking bolt, adjusting the clamping jaw to a suitable position, completing the centering adjustment and installation of the clamping module on the valve body, and locking the centering adjusting bolt and the clamping jaw locking bolt.

[0040] Step 4: Start the double-acting hydraulic cylinder and conduct the valve blue oil test.

[0041] Step 4.1: Connect the double-acting hydraulic cylinder interface to the pump;

[0042] Step 4.2: Drive the piston rod to move forward to make the gate fit against the valve seat;

[0043] Step 4.3: Drive the piston rod to move in the opposite direction to separate the gate from the valve seat.

[0044] Step 4.4: Move the gate out of the valve body and observe the distribution of blue oil on the gate sealing surface to determine the valve sealing performance.

[0045] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A blue oil test device for large-caliber wedge-type gate valves in nuclear power plants, characterized in that: The device includes a frame, a clamping module and a driving module. The frame is used to support and fix the device. The driving module is arranged in the middle of the frame. The driving module is connected to the gate plate to drive the gate plate to move along the piston rod. The clamping modules are arranged on both sides of the frame. The clamping modules are used to realize the fixed connection between the device and the valve. The clamping module includes a clamping claw and a clamping claw locking bolt. The clamping claw is fixed to both sides of the frame by the clamping claw locking bolt.

2. A blue oil test device for large-caliber wedge-type gate valves in nuclear power plants according to claim 1, characterized in that: The frame adopts a beam structure, and sliding grooves are provided at the connection between the two sides of the frame and the clamping claws, allowing the clamping claws to slide along the direction of the sliding grooves.

3. A blue oil test device for large-caliber wedge-type gate valves in nuclear power plants according to claim 1, characterized in that: The clamping module further comprises a centering adjustment bolt, the clamping jaw 6 is clamped on the concave annular surface at the top of the valve body, and the centering adjustment bolt and the clamping jaw locking bolt jointly fix the clamping jaw and the frame.

4. A blue oil test device for large-caliber wedge-type gate valves in nuclear power plants according to claim 1, characterized in that: The driving module includes a double-acting hydraulic cylinder, a piston rod, a quick-release locating pin and a gate connecting rod. The piston rod runs through the middle of the frame, the double-acting hydraulic cylinder is provided at the top of the piston rod, the gate connecting rod is provided at the lower end of the piston rod, and the piston rod is fixed to the gate connecting rod by the quick-release locating pin.

5. A blue oil test device for large-caliber wedge-type gate valves in nuclear power plants according to claim 4, characterized in that: The end of the gate connecting rod is provided with an interface adapted to the connection interface of the gate.

6. A blue oil test method for large-caliber wedge-type gate valves in nuclear power plants according to any one of claims 1 to 5, characterized in that: The method comprises: Step 1: Connect and fix the gate connecting rod of the driving module to the gate; Step 2: Apply blue oil on the gate sealing surface; Step 3: Fix the clamping jaws of the clamping module to the valve; Step 4: Start the double-acting hydraulic cylinder and conduct the valve blue oil test.

7. A blue oil test method for large-caliber wedge-type gate valves in nuclear power plants according to claim 6, characterized in that: The step three specifically includes: loosening the center adjusting bolt and the clamp locking bolt, adjusting the clamp to a suitable position, completing the centering adjustment and installation and fixation of the clamping module on the valve body, and locking the centering adjusting bolt and the clamp locking bolt.

8. A blue oil test method for large-caliber wedge-type gate valves in nuclear power plants according to claim 6, characterized in that: The step 4 specifically includes: Step 4.1: Connect the double-acting hydraulic cylinder interface to the pump; Step 4.2: driving the piston rod to move forward so that the gate plate fits the valve seat; Step 4.3: driving the piston rod to move in the opposite direction to separate the gate plate from the valve seat; Step 4.4: Move the gate out of the valve body and observe the distribution of blue oil on the gate sealing surface to determine the valve sealing performance.

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