Device for testing water pressure resistance of shield tail sealing grease

Abstract

The utility model discloses a device for testing the water pressure resistance of shield tail sealing grease, and aims to provide a device for testing the water pressure resistance of shield tail sealing grease, which simulates an actual working environment in a water pressure resistance test process. Comprising a cylinder body, a top cover and a stirring assembly, a metal net is arranged at the lower end of the cylinder body, the metal net is detachably connected with the cylinder body, the top cover is installed at the upper end of the cylinder body, the stirring assembly is installed on the top cover, the lower end of the stirring assembly penetrates through the top cover and then is arranged in the cylinder body, and a water inlet pipe is installed on the cylinder body. The water pressure resistance testing device has the advantages that the actual working environment is simulated in the water pressure resistance testing process, the top cover can be conveniently installed, testing water can be stirred, the testing process can be perfected, the pressure can be changed, and the metal net can be conveniently disassembled and assembled.

Description

Technical Field

[0001] This utility model relates to the technical field of testing devices, and in particular to a device for testing the water pressure resistance of a shield tail sealing grease. Background Technology

[0002] Tail sealing grease is a crucial material for sealing the tail of a tunnel boring machine (TBM). It fills the gaps between the tail wire brush and the tunnel lining segments. The grease, combined with the wire brush, forms a tail sealing layer that effectively prevents the infiltration of mud and groundwater, thus sealing the tail of the TBM. Therefore, the water pressure resistance of the tail sealing grease is an important indicator. Current testing methods involve laying a 25mm thick layer of tail sealing grease on a metal mesh at the bottom of the tunnel lining, filling the grease with water, applying pressure from above the water surface, and measuring the time it takes for water to begin flowing out from the bottom of the tunnel lining. Most current testing devices perform static water pressure tests. However, in actual use, pressure fluctuates, and water is also fluid. To more closely approximate the actual operating environment, the pressure test needs to incorporate water flow and pressure fluctuations within a certain range.

[0003] Chinese Patent Publication No. CN219301883U, published on July 4, 2023, discloses a device for testing the water pressure resistance of a shield tail sealing grease. The device includes a cylindrical body with a metal mesh at the bottom. Its key feature is that a shell is provided outside the cylindrical body, forming an annular cavity between the inner wall of the shell and the outer wall of the cylindrical body. A heating wire is disposed within this annular cavity. A piston plate is located at the top of the cylindrical body, and a lifting rod is connected to the top of the piston plate. A connecting flow channel is provided between the piston plate and the lifting rod, with the flow channel in the middle of the piston plate extending to the outer walls of the piston plate, and the flow channel in the middle of the lifting rod communicating with the annular cavity. A drawback of this invention is the lack of environmental simulation during actual use. Utility Model Content

[0004] This invention aims to overcome the shortcomings of existing technologies that lack simulation of actual usage environments, and provides a device for testing the water pressure resistance performance of shield tail sealing grease by simulating the actual working environment during water pressure resistance testing.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A device for testing the water pressure resistance of a shield tail sealing grease includes a cylinder, a top cover, and a stirring assembly. The lower end of the cylinder is provided with a metal mesh, which is detachably connected to the cylinder. The top cover is installed on the upper end of the cylinder. The stirring assembly is installed on the top cover, and the lower end of the stirring assembly passes through the top cover and is placed inside the cylinder. A water inlet pipe is installed on the cylinder.

[0007] A metal mesh is installed at the lower end of the cylinder. Grease is then added from the top of the cylinder onto the metal mesh at the bottom. After adding the grease, a top cover is installed to seal the cylinder. Water is then added to the sealed cylinder through a water inlet pipe to increase the pressure inside the cylinder. The water pressure acts on the grease. Once the specified pressure is reached, the stirring component is activated. One end of the stirring component extends into the cylinder and rotates, causing the test water to flow. This simulates the usage environment and achieves the purpose of simulating the actual working environment during the water pressure resistance test.

[0008] Preferably, the top cover is equipped with several circumferentially distributed fixing blocks I, each fixing block I having a fixing groove I. The upper end of the cylinder is equipped with several circumferentially distributed fixing blocks II, each fixing block II having a fixing groove II. The fixing blocks I and II correspond one-to-one. A screw is provided in the fixing groove II. One end of the screw is rotatably connected to the fixing block II, and the other end of the screw passes through the fixing groove II and is placed on the upper end of the fixing block II. A fixing nut is installed on the screw. A sealing block is installed on the side of the top cover facing the cylinder. A handle ring is installed on the upper end of the top cover. The top cover is installed on the upper end of the cylinder. A main sealing block is installed on one side of the cylinder to seal the connection between the cylinder and the top cover. A handle is installed on the other side of the cylinder for moving the top cover. When connecting the top cover to the cylinder, fix block one and fix block two correspond one-to-one. Then, rotate the screw in fixation groove two to turn the upper end of the screw into fixation groove one. Then, rotate the nut on the screw to press the top cover and the cylinder together to ensure a seal at the upper end of the cylinder. This design facilitates the installation of the top cover.

[0009] Preferably, the stirring assembly includes a rotating rod and a motor. The lower end of the rotating rod passes through the top cover and is placed inside the cylinder. Several circumferentially distributed extension rods are installed at the lower end of the rotating rod. One end of each extension rod is connected to the rotating rod, and a disc is installed at the other end. A gear is installed at the other end of the rotating rod. The motor is mounted on the top cover, and a gear is installed on the motor shaft of the motor. Gears 1 and 2 mesh. With the lower end of the rotating rod penetrating the top cover and placed inside the cylinder, the rotation of the motor drives the rotating rod to rotate through the meshing of gears 1 and 2. This rotation causes the extension rods and disc at the lower end to rotate together. The rotation of the disc agitates the test water, causing it to rotate and flow, simulating the flow of water in a working environment. This design effectively agitates the test water.

[0010] Preferably, one end of the water inlet pipe is connected to the cylinder body, and the other end of the water inlet pipe is equipped with a one-way valve. An air vent valve is installed on the top cover and is connected to the cylinder body. A pressure gauge is also installed on the top cover. Test water is injected into the cylinder body through the water inlet pipe, and the one-way valve on the water inlet pipe ensures that the test water does not flow back. The air vent valve on the top cover removes gas from the cylinder body before injecting test water. Simultaneously, the pressure is monitored by the pressure gauge during the injection of test water. This design improves the testing process.

[0011] Preferably, a wave-like tube is installed on one side of the cylinder, and a pneumatic cylinder is installed inside the wave-like tube. A push block is installed on the pneumatic end of the pneumatic cylinder, and the push block matches the wave-like tube. To achieve pressure fluctuation, a wave-like tube communicating with the cylinder is installed on one side of the cylinder. The end of the wave-like tube away from the cylinder is closed. A pneumatic cylinder is installed inside the wave-like tube, with the pneumatic end of the cylinder connected to the push block. The push block corresponds to the wave-like tube. By moving the push block inside the wave-like tube, the volume of the cylinder can be changed, thereby changing the pressure inside the cylinder and achieving pressure fluctuation. This design can change the magnitude of the pressure.

[0012] Preferably, the metal mesh includes a mounting ring and a grid. The mounting ring corresponds to the cylinder body, and the grid is installed inside the mounting ring. Several circumferentially distributed limiting plates are installed on the bottom surface of the cylinder body. One end of each limiting plate is rotatably connected to the bottom surface of the cylinder body, and the other end corresponds to the mounting ring. The metal mesh is installed at the bottom of the cylinder body, and the grid inside the mounting ring forms the metal mesh. After the metal mesh is placed inside the cylinder body, rotating the several circumferentially distributed limiting plates causes one end of each limiting plate to contact the bottom surface of the mounting ring, thus confining the mounting ring inside the cylinder body. This design facilitates disassembly and cleaning of the metal mesh, making it easier to install and remove.

[0013] The beneficial effects of this utility model are: it simulates the actual working environment during the water pressure test, facilitates the installation of the top cover, can agitate the test water, can improve the test process, can change the pressure, and facilitates the disassembly and assembly of the metal mesh. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 yes Figure 1 Cross-sectional view;

[0016] Figure 3 yes Figure 1 Schematic diagram of the middle cylinder;

[0017] Figure 4 yes Figure 1 Schematic diagram of the structure of the top cover;

[0018] Figure 5 yes Figure 2 A schematic diagram of the structure of a metal mesh.

[0019] In the diagram: 1. Cylinder; 11. Fixing Block II; 12. Fixing Groove II; 13. Screw; 14. Fixing Nut; 15. Flushing Pipe; 16. Pneumatic Cylinder; 17. Push Block; 18. Limiting Plate; 2. Top Cover; 21. Fixing Block I; 22. Fixing Groove I; 23. Sealing Block; 24. Hand Ring; 25. Exhaust Valve; 26. Pressure Gauge; 3. Stirring Assembly; 31. Rotating Rod; 32. Motor I; 33. Extension Rod; 34. Disc; 35. Gear I; 36. Gear II; 4. Metal Mesh; 41. Mounting Ring; 42. Grid; 5. Water Inlet Pipe; 51. Check Valve; Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1 , Figure 2 As shown in the embodiment, a water pressure resistance testing device for a shield tail sealing grease includes a cylinder 1, a top cover 2, and a stirring assembly 3. A metal mesh 4 is provided at the lower end of the cylinder 1, and the metal mesh 4 is detachably connected to the cylinder 1. The top cover 2 is installed at the upper end of the cylinder 1, and the stirring assembly 3 is installed on the top cover 2. The lower end of the stirring assembly 3 passes through the top cover 2 and is placed inside the cylinder 1. A water inlet pipe 5 is installed on the cylinder 1.

[0022] like Figure 3 As shown, a number of circumferentially distributed fixing blocks 21 are installed on the top cover 2. Fixing blocks 21 are equipped with fixing grooves 22. A number of circumferentially distributed fixing blocks 11 are installed on the upper end of the cylinder 1. Fixing blocks 11 are equipped with fixing grooves 12. Fixing blocks 11 and fixing blocks 11 correspond one-to-one. A screw 13 is provided in the fixing groove 12. One end of the screw 13 is rotatably connected to the fixing block 11. The other end of the screw 13 passes through the fixing groove 12 and is placed on the upper end of the fixing block 11. A fixing nut 14 is installed on the screw 13. A sealing block 23 is installed on the side of the top cover 2 facing the cylinder 1. A handle ring 24 is installed on the upper end of the top cover 2.

[0023] like Figure 4 As shown, the stirring assembly 3 includes a rotating rod 31 and a motor 32. The lower end of the rotating rod 31 passes through the top cover 2 and is placed inside the cylinder 1. Several circumferentially distributed extension rods 33 are installed at the lower end of the rotating rod 31. One end of the extension rod 33 is connected to the rotating rod 31, and a disc 34 is installed at the other end of the extension rod 33. A gear 35 is installed at the other end of the rotating rod 31. The motor 32 is installed on the top cover 2. A gear 36 is installed on the motor shaft of the motor 32. The gear 35 meshes with the gear 36.

[0024] One end of the water inlet pipe 5 is connected to the cylinder 1, and the other end of the water inlet pipe 5 is equipped with a one-way valve 51. An exhaust valve 25 is installed on the top cover 2, and the exhaust valve 25 is connected to the cylinder 1. A pressure gauge 26 is installed on the top cover 2.

[0025] A wave tube 15 is installed on one side of the cylinder 1. A pneumatic cylinder 16 is installed inside the wave tube 15. A push block 17 is installed on the pneumatic end of the pneumatic cylinder 16. The push block 17 is matched with the wave tube 15.

[0026] like Figure 5 As shown, the metal mesh 4 includes a mounting ring 41 and a grid 42. The mounting ring 41 corresponds to the cylinder 1. The grid 42 is installed inside the mounting ring 41. Several circumferentially distributed limiting plates 18 are installed on the bottom surface of the cylinder 1. One end of the limiting plate 18 is rotatably connected to the bottom surface of the cylinder 1, and the other end of the limiting plate 18 corresponds to the mounting ring 41.

[0027] During testing, the metal mesh 4 is placed inside the cylinder 1, and then the limiting plate 18 is rotated so that one end of the limiting plate 18 contacts the bottom surface of the mounting ring 41. Then, grease is added from the top of the cylinder 1 onto the metal mesh 4 piled at the bottom of the cylinder 1. After the grease is added, the top cover 2 is installed. When the top cover 2 is connected to the cylinder 1, the fixing block 1 21 and the fixing block 2 11 are aligned one-to-one. Then, the screw 13 in the fixing groove 2 12 is rotated so that the upper end of the screw 13 is turned into the fixing groove 1 21. Then, the fixing nut 14 on the screw 13 is rotated to press the top cover 2 and the cylinder 1 together.

[0028] After the top cover 2 is installed, test water is injected into the water inlet pipe 5 and the gas is discharged through the exhaust valve 25. As the test water is injected, the pressure inside the cylinder 1 rises. The pressure is observed through the pressure gauge 26. After the pressure reaches the specified value, the sealing performance of the grease is observed.

[0029] During the test, motor 32 drives the rotating rod 31 to rotate through the meshing of gear 35 and gear 36. The rotating rod 31 stirs the test water through the extension rod 33 and the disc 34. The pneumatic cylinder 16 drives the pusher 17 to move in the wave tube 15, changing the pressure in the cylinder 1. The working environment is simulated by the flow of test water and pressure changes, so as to better test the performance.

Claims

1. A device for testing the water pressure resistance of a shield tail sealing grease, characterized in that, The device includes a cylinder (1), a top cover (2), and a stirring assembly (3). The lower end of the cylinder (1) is provided with a metal mesh (4), which is detachably connected to the cylinder (1). The top cover (2) is installed on the upper end of the cylinder (1). The stirring assembly (3) is installed on the top cover (2). The lower end of the stirring assembly (3) passes through the top cover (2) and is placed inside the cylinder (1). A water inlet pipe (5) is installed on the cylinder (1).

2. The device for testing the water pressure resistance of shield tail sealing grease according to claim 1, characterized in that, The top cover (2) is equipped with several circumferentially distributed fixing blocks (21), and the fixing blocks (21) are equipped with fixing grooves (22). The upper end of the cylinder (1) is equipped with several circumferentially distributed fixing blocks (11), and the fixing blocks (11) are equipped with fixing grooves (12). The fixing blocks (21) and fixing blocks (11) correspond one-to-one. The fixing grooves (12) are equipped with screws (13). One end of the screws (13) is rotatably connected to the fixing blocks (11). The other end of the screws (13) passes through the fixing grooves (12) and is placed on the upper end of the fixing blocks (11). The screws (13) are equipped with fixing nuts (14). The top cover (2) is equipped with a sealing block (23) on the side facing the cylinder (1). The top cover (2) is equipped with a handle ring (24).

3. The device for testing the water pressure resistance of shield tail sealing grease according to claim 1, characterized in that, The stirring assembly (3) includes a rotating rod (31) and a motor (32). The lower end of the rotating rod (31) passes through the top cover (2) and is placed inside the cylinder (1). Several circumferentially distributed extension rods (33) are installed at the lower end of the rotating rod (31). One end of the extension rod (33) is connected to the rotating rod (31). A disc (34) is installed at the other end of the extension rod (33). A gear (35) is installed at the other end of the rotating rod (31). The motor (32) is installed on the top cover (2). A gear (36) is installed on the motor shaft of the motor (32). The gear (35) meshes with the gear (36).

4. The device for testing the water pressure resistance of a shield tail sealing grease according to claim 1, characterized in that, One end of the water inlet pipe (5) is connected to the cylinder (1), and the other end of the water inlet pipe (5) is equipped with a one-way valve (51). An exhaust valve (25) is installed on the top cover (2), and the exhaust valve (25) is connected to the cylinder (1). A pressure gauge (26) is installed on the top cover (2).

5. The device for testing the water pressure resistance of a shield tail sealing grease according to claim 1, characterized in that, A wave tube (15) is installed on one side of the cylinder (1), and a pneumatic cylinder (16) is installed inside the wave tube (15). A push block (17) is installed on the pneumatic end of the pneumatic cylinder (16), and the push block (17) is matched with the wave tube (15).

6. The device for testing the water pressure resistance of a shield tail sealing grease according to claim 1, characterized in that, The metal mesh (4) includes a mounting ring (41) and a grid (42). The mounting ring (41) corresponds to the cylinder (1). The grid (42) is installed inside the mounting ring (41). A number of circumferentially distributed limiting plates (18) are installed on the bottom surface of the cylinder (1). One end of the limiting plate (18) is rotatably connected to the bottom surface of the cylinder (1). The other end of the limiting plate (18) corresponds to the mounting ring (41).

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