Slurry pump pressure relief mechanism for shield tunneling machine

Abstract

The invention discloses a slurry pump pressure relief mechanism for a shield tunneling machine, which comprises a slurry pump main body, the slurry pump main body is connected with two pressure relief valves, the slurry pump main body is also provided with an adjusting communication part and a flushing part, the adjusting communication part adjusts the slurry pump main body to be communicated with one pressure relief valve, and the flushing part is communicated with the other pressure relief valve. The flushing part injects water into the other pressure release valve for flushing; according to the slurry pump pressure relief mechanism for the shield tunneling machine, by arranging the adjusting communication part, after the pressure relief valve completes pressure relief treatment on the slurry pump body, the adjusting communication part works, so that the pressure relief valve just completing pressure relief treatment is isolated from the slurry pump body, and then the pressure relief valve completing pressure relief treatment is washed through the washing part; the residual slurry in the pressure release valve is removed, and the situation that the residual slurry is solidified between the valve clack and the valve seat to form a layer of hard sediment, so that the sealing face cannot be completely attached, and the sealing performance of the pressure release valve is affected is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mud pumps, in particular to a mud pump pressure relief mechanism for a shield machine. BACKGROUND

[0002] A shield machine is a special engineering machine for tunneling, which is widely used in subway, railway, highway, municipal, water and electricity tunnel engineering. Shield machines can be divided into earth pressure balance shield machines and slurry balance shield machines according to the supporting method of the excavation face. The slurry balance shield machine uses the pressure of slurry to balance the pressure of the excavation face, and is mainly suitable for high water pressure and high permeability strata such as sandy gravel strata and silt strata. The slurry balance shield machine discharges the mixed soil and slurry out of the tunnel through the slurry circulation system. The slurry pump is the core equipment of the slurry circulation system, which realizes slurry transportation and recycling through the slurry pump. Due to various reasons (such as pipe blockage, valve closing, slurry viscosity change, etc.), the system pressure will rise sharply during the operation of the existing slurry pump, which will cause safety accidents such as pump body rupture and pipe burst. In order to protect the equipment from overpressure damage, a pressure relief valve is arranged on the slurry pump to release the high pressure in the slurry pump.

[0003] A reset type mud blowout device for a drilling pump is disclosed in the patent with publication number CN112096940B and publication date July 8, 2022. The device includes a main valve assembly, a manual blowout valve assembly arranged on the outer wall of the main valve assembly, a control valve assembly connected to one end of the main valve assembly, and an outlet flange connected to the other end of the main valve assembly. The outer wall of the main valve assembly is connected to the outlet flange, and the connection flange is connected to the inlet flange. The working process of the device does not require pump stopping and shear pin replacement, reducing the use and maintenance cost and the labor intensity of the on-site operator, and improving the drilling efficiency. The device uses a control valve spring with small rigidity to adjust the blowout pressure, which can realize stepless and precise adjustment of the blowout pressure, improve the blowout precision of the device, and replace the pressure relief bypass on the blowout pipeline by setting a manual blowout valve assembly in the device, simplifying the structure of the pipeline and reducing the manufacturing cost of the pipeline.

[0004] The existing pressure relief valve on the mud pump completes the pressure relief process, but due to the high viscosity of the mud, especially when containing more solid particles (such as drill cuttings, sand particles, etc.), when the mud passes through the pressure relief valve under high pressure, the viscosity will cause the mud to form a thin film between the valve clack and the valve seat, and the solid particles in the mud may be embedded in the sealing surface between the valve clack and the valve seat under high pressure. When the pressure relief valve is closed, these particles will hinder the close fit of the valve clack and the valve seat, causing mud to remain between them, and when the mud residue between the valve clack and the valve seat hardens, a layer of hard deposit is formed, causing the sealing surface to not fit completely, reducing the sealing performance of the pressure relief valve. SUMMARY

[0005] The purpose of the present application is to provide a mud pump pressure relief mechanism for a shield tunneling machine to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0007] A mud pump pressure relief mechanism for a shield tunneling machine, comprising a mud pump body, the mud pump body is connected with two pressure relief valves, the mud pump body is also provided with an adjusting communication part and a flushing part, the adjusting communication part adjusts the communication between the mud pump body and any one of the pressure relief valves, and the flushing part injects water to flush the other pressure relief valve.

[0008] The above-mentioned pressure relief valve comprises a valve body connected with the mud pump body, a pressure relief port is formed in the valve body, a valve clack is connected in the valve body through a first spring, a valve seat is arranged in the valve body, and the valve seat and the valve clack cooperate to realize sealing, the first spring provides elastic force to keep the valve clack in a closed state, and when the internal pressure of the mud pump body overcomes the elastic force of the first spring, the fluid pushes the valve clack to open for pressure relief.

[0009] The above-mentioned valve body is provided with a sliding seat, the sliding seat is connected with the side of the first spring away from the valve clack, and the valve body is also provided with a locking part, the locking part is used for locking the sliding seat, and when the locking part locks the sliding seat, the valve clack and the valve seat realize sealing.

[0010] The above-mentioned two pressure relief valves are provided with a traction part, when one of the pressure relief valves is opened under the pressure of the fluid in the mud pump body, the traction part drives the locking part in the other pressure relief valve to unlock the sliding seat, and drives the sliding seat to move upward away from the corresponding valve clack with the first spring.

[0011] The above-mentioned sliding seat is circumferentially provided with at least two pin holes for locking.

[0012] The locking part includes a pin column matched with the pin hole, the pin column is connected with the valve body through a third spring, and the locking of the sliding seat is completed when the pin column is inserted into the pin hole.

[0013] The sliding seat is provided with a through cavity in the center, two communication channels are arranged in the sliding seat, the two communication channels are connected with the two pin holes and the through cavity in the middle, an unlocking push rod is slidably arranged in the communication channel through a second spring, the unlocking push rod is inserted into the pin hole based on the movement of the traction part on the other pressure relief valve, and the locking of the sliding seat by the locking part is released.

[0014] The traction part includes a rod body connected with the valve disc, the rod body passes through the through cavity, the traction part includes a rod body connected with the valve disc, the rod body passes through the through cavity, a traction sleeve is arranged on the outer side of the rod body, the traction sleeve is connected with the valve body through a fourth spring, two extrusion rings are fixedly arranged on the two sides of the traction sleeve, the two extrusion rings correspond to the two unlocking push rods respectively, a synchronous movement connecting piece is further arranged on the rod body, one end of the synchronous movement connecting piece passes through the valve body and is connected with the traction sleeve on the traction part in the valve body, and the traction sleeve on the traction part in the other pressure relief valve is synchronously moved upward based on the upward movement of the rod body.

[0015] The two extrusion rings are located in the through cavity, and the lower end of the through cavity is not large enough for the extrusion rings to pass through.

[0016] The inner wall of the valve body is further provided with a rectangular spiral groove, and a sliding block is fixedly arranged on the side wall of the sliding seat and inserted into the rectangular spiral groove.

[0017] The beneficial effects of the present application are that in the above technical solution, the mud pump pressure relief mechanism for a shield tunneling machine provided by the present application is provided with an adjusting communication part, after the pressure relief valve completes the pressure relief treatment on the mud pump body, the adjusting communication part works to isolate the pressure relief valve which has just completed the pressure relief treatment from the mud pump body, and then the flushing part is used to flush the pressure relief valve which has completed the pressure relief treatment, so as to remove the residual mud in the pressure relief valve, avoid the formation of a layer of hard deposits between the valve disc and the valve seat due to the solidification of the residual mud, and cause the sealing surface to be unable to completely adhere, thereby affecting the sealing performance of the pressure relief valve. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings needed in the embodiments will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.

[0019] Figure 1 A schematic structural diagram of a slurry pump pressure relief mechanism for a shield machine provided in an embodiment of the present invention;

[0020] Figure 2 A front view schematic diagram of a slurry pump pressure relief mechanism for a shield machine provided by an embodiment of the present invention;

[0021] Figure 3 A schematic diagram of the connection between the pressure relief valve and the mud pump body provided in an embodiment of the present invention;

[0022] Figure 4 A schematic diagram of the internal structure of a pressure relief valve provided in an embodiment of the present invention;

[0023] Figure 5 A schematic structural diagram of a pressure relief valve provided by an embodiment of the present invention from another perspective;

[0024] Figure 6 The embodiment of the present invention provides Figure 5 A magnified schematic diagram of .

[0025] Description of reference numerals:

[0026] 1. Mud pump body; 2. Pressure relief valve; 21. Valve body; 22. Valve disc; 23. Valve seat; 24. First spring; 25. Pressure relief port; 26. Rectangular spiral groove; 3. Adjusting connecting part; 4. Flushing part; 5. Sliding seat; 51. Pin hole; 52. Through cavity; 53. Connecting channel; 54. Second spring; 55. Unlocking push rod; 6. Locking part; 61. Pin column; 62. Third spring; 7. Traction part; 71. Rod body; 72. Traction sleeve; 73. Extrusion ring; 74. Synchronous moving connection; 75. Fourth spring. DETAILED DESCRIPTION

[0027] In order to make those skilled in the art better understand the technical solution of the present invention, Figures 1-6 , the present invention is further introduced in detail.

[0028] An embodiment of the present invention provides a mud pump pressure relief mechanism for a shield machine, including a mud pump main body 1, to which a pressure relief valve 2 is connected, and two pressure relief valves 2 are provided. The mud pump main body 1 is also provided with an adjusting connecting part 3 and a flushing part 4. The adjusting connecting part 3 adjusts the mud pump main body 1 to be connected with one of the pressure relief valves 2, and the flushing part 4 injects water into the other pressure relief valve 2 for flushing.

[0029] Specifically, the mud pump body 1 is an important equipment in drilling engineering, which is installed on a shield machine, and when the shield machine is working underground, the mud pump body 1 will pump the mud away from the working area due to the work of the shield machine, wherein the mud pump body 1 is usually composed of a cylinder, a plunger (or a piston), a suction valve, a discharge valve, a suction pipe and a discharge pipe, when the mud pump body 1 is working, as the plunger retreats, the volume in the cylinder increases, the pressure decreases, and a negative pressure is formed, at this time, the suction valve is opened under the action of the internal and external pressure difference, the mud enters the cylinder from the suction pipe, then the plunger turns, as the plunger advances, the volume in the cylinder decreases, the pressure rises, at this time, the suction valve is closed, the discharge valve is opened under the action of the internal and external pressure difference, the mud is pressed from the cylinder into the discharge pipe, and finally the mud is discharged from the discharge pipe and leaves the working area of the shield machine, wherein the mud pump body 1 conveying mud is prior art, and its principle will not be described in detail, in the working process of the existing mud pump body 1, the pressure in the cylinder will change with the reciprocating motion of the plunger (or the piston); if there is a blockage, a valve failure or other abnormal conditions in the system, the pressure in the cylinder may rise sharply, exceeding the design pressure of the pump, for example, when the discharge pipe is blocked by foreign matter, the liquid cannot be normally discharged, the pressure will continue to accumulate, like a balloon that is constantly compressed, and finally it may cause the cylinder, the discharge pipe or other components to break, at this time, a pressure relief device (such as a pressure relief valve 2) needs to be installed on the mud pump body 1, when the pressure in the cylinder reaches the set upper limit of the safety pressure, the pressure relief valve 2 is automatically opened to discharge the excess liquid, thereby reducing the system pressure and preventing the cylinder, the plunger (or the piston), the valve and other components from being damaged due to overpressure, wherein, as shown in Figure 4 The pressure relief valve 2 mainly consists of a valve body 21, a valve flap 22, a valve seat 23 and a first spring 24, the valve body 21 is connected with the mud pump body 1, a pressure relief port 25 is formed in the valve body 21, the valve flap 22 is connected with the valve body 21 through the first spring 24, the valve seat 23 is arranged in the valve body 21, and the valve seat 23 and the valve flap 22 are matched to realize sealing, under normal circumstances, the first spring 24 provides elastic force to make the valve flap 22 seal and fit on the valve seat 23 to keep in a closed state, at this time, the mud in the cylinder cannot enter the valve body 21, when the internal pressure of the mud pump body 1 is too large, when the internal pressure of the mud pump body 1 overcomes the elastic force of the first spring 24, the fluid (i.e. the mud) pushes the valve flap 22 to open, the mud enters the pressure relief valve 2 and is sprayed out of the pressure relief port 25, thereby relieving the pressure of the mud pump body 1.

[0030] The prior art has the following disadvantages: the existing pressure relief valve 2, when completing the pressure relief process, the mud in the mud pump body 1 will be sprayed out of the pressure relief valve 2, wherein, due to the fact that the mud usually has high viscosity, especially when containing more solid particles (such as drill cuttings, sand particles, etc.), when the mud passes through the pressure relief valve 2 under high pressure, the viscosity will cause the mud to form a thin film between the valve disc 22 and the valve seat 23 of the pressure relief valve 2, and the solid particles in the mud under high pressure can be embedded into the sealing surface between the valve disc 22 and the valve seat 23, when the pressure relief valve 2 is closed, these particles will hinder the close fit of the valve disc 22 and the valve seat 23, causing mud to remain between them, and when the mud residue between the valve disc 22 and the valve seat 23 hardens, a layer of hard deposit will be formed, causing the sealing surface to not fit completely, reducing the sealing performance of the pressure relief valve 2.

[0031] To solve the above problems, in the embodiment, the pressure relief valve 2 is provided with two, two said mud pump body 1 is communicated with the pressure relief valve 2, the mud pump body 1 is also provided with adjusting communication part 3 and flushing part 4, the adjusting communication part 3 has a channel and is communicated with two said pressure relief valve 2, but in the control, make the mud pump body 1 and any one of the pressure relief valve 2 in the communication state, and with another in the non-communication state, such as controllable three-way valve can realize the function, in the embodiment, the adjusting communication part 3 can select electric control three-way ball valve, electric control three-way ball valve connects two pressure relief valves 2 and the inside of the mud pump body 1, by remote control three-way ball valve, make the mud pump body 1 and any one of the pressure relief valve 2 keep connected and another not connected state, obviously, when the pressure in the mud pump body 1 is too large, the pressure relief capacity of one pressure relief valve 2 is insufficient and timely to the mud pump body 1, three-way ball valve rotates to the appropriate position, so that two pressure relief valves 2 are simultaneously communicated with the inside of the mud pump body 1 and work simultaneously to relieve pressure, at this time, two pressure relief valves 2 are opened, improve the pressure relief efficiency of the whole mud pump body 1, (the technology of making fluid flow from one inlet to one or two of two outlets by controlling three-way ball valve is prior art, and its principle is not described), and, the flushing part 4 can select the combination of water tank, water injection pump, shunt water pipe with two shunt channels, the water tank is installed on the mud pump body 1, the water tank is filled with liquid (such as water) for cleaning the pressure relief valve 2, the water tank is connected with the water injection pump, the water injection pump is connected with the main channel of the shunt water pipe, the two shunt channels of the shunt water pipe are communicated with two pressure relief valves 2 respectively, it should be noted that the connection position of the shunt water pipe and the pressure relief valve 2 should be below the valve clack 22, the connection position of the shunt water pipe and the pressure relief valve 2 is also provided with an electric control valve, which is used to control whether the shunt water pipe and the corresponding pressure relief valve 2 keep connected, in the initial state, the adjusting communication part 3 controls any one of the pressure relief valve 2 to be communicated with the mud pump body 1, when the pressure relief valve 2 communicated with the mud pump body 1 completes the pressure relief process, the adjusting communication part 3 controls another pressure relief valve 2 to be communicated with the mud pump body 1, the pressure relief valve 2 originally communicated with the mud pump body 1 is separated from the mud pump body 1, then the flushing part 4 injects cleaning liquid into the separated pressure relief valve 2, the cleaning liquid enters the area below the valve clack 22 of the pressure relief valve 2, as the cleaning liquid below the valve clack 22 increases, the valve clack 22 is pushed open by the cleaning liquid, that is, similar to the pressure relief process, the cleaning liquid flows in the pressure relief valve 2 to clean the inside of the pressure relief valve 2, as the cleaning liquid flows, the mud on the inner wall of the pressure relief valve 2 is driven out of the pressure relief port 25 of the pressure relief valve 2, removing the mud residue between the valve clack 22 and the valve seat 23, avoiding the hard deposit formed between the valve clack 22 and the valve seat 23 due to the solidification of the residual mud, causing the sealing surface to not completely fit, affecting the occurrence of the sealing performance of the pressure relief valve 2, after that,After the other pressure relief valve 2 has completed pressure relief, the above steps are repeated for cleaning. The pressure relief valve 2 cleaned in the above process is linked to the mud pump body 1 again, waiting for pressure relief processing.

[0032] It should be noted that, in this embodiment, in order to clean the mud residue between the valve disc 22 and the valve seat 23, the connection position between the diverter water pipe and the pressure relief valve 2 is usually located below the valve disc 22. As the diverter water pipe injects cleaning fluid into the pressure relief valve 2, the cleaning fluid needs to have a strong water pressure to be able to push open the valve disc 22 of the pressure relief valve 2 and clean the mud between the valve disc 22 and the valve seat 23. At this time, the regulating connecting part 3 that isolates the pressure relief valve 2 will also be subjected to high pressure from the cleaning fluid, and the other side of the regulating connecting part 3 will also be subjected to high pressure from the inside of the mud pump body 1, which can easily lead to increased wear of the regulating connecting part 3, reduce the sealing performance of the regulating connecting part 3, and even cause damage to the regulating connecting part 3 in severe cases.

[0033] In order to solve the above problems, preferably, the valve body 21 is provided with a sliding seat 5 connected to the side of the first spring 24 away from the valve disc 22, and the valve body 21 is also provided with a locking portion 6 for locking the sliding seat 5, and when the locking portion 6 locks the sliding seat 5, the valve disc 22 and the valve seat 23 are sealed; the sliding seat 5 is provided with at least two pin holes 51 for locking in the circumferential direction, and the pin holes 51 are horizontally arranged; the locking portion 6 includes a pin column 61 matched with the pin hole 51, one end of the pin column 61 near the sliding seat 5 is arc-shaped, and the other end of the pin column 61 is connected to the valve body 21 through a third spring 62, and when the pin column 61 is inserted into the pin hole 51, the locking of the sliding seat 5 is completed; the center of the sliding seat 5 is provided with a through cavity 52, and the inside of the sliding seat 5 is provided with two (for example, two) communication channels 53, and the two communication channels 53 are connected to the through cavity 52 located in the middle and on both sides; an unlocking push rod 55 is slidably installed in the communication channel 53 through a second spring 54, and a traction portion 7 is arranged between the two pressure relief valves 2, when one of the pressure relief valves 2 is opened under the pressure of the fluid in the mud pump body 1, the traction portion 7 drives the locking portion 6 in the other pressure relief valve 2 to unlock the sliding seat 5, and drives the sliding seat 5 to move upward away from the corresponding valve disc 22 with the first spring 24; the traction portion 7 includes a rod body 71 connected to the valve disc 22, the rod body 71 passes through the through cavity 52, a traction sleeve 72 is arranged on the outer side of the rod body 71, the traction sleeve 72 is connected to the valve body 21 through a fourth spring 75, an extrusion ring 73 is fixedly installed on the upper end of the traction sleeve 72, the extrusion ring 73 is circular truncated cone-shaped, the side walls of the extrusion ring 73 abut against the unlocking push rods 55 on both sides respectively, a synchronous movement connecting piece 74 is also fixedly arranged on the rod body 71, the other end of the synchronous movement connecting piece 74 passes through the valve body 21 and is connected to the traction sleeve 72 on the traction portion 7 inside the valve body 21, based on the upward movement of the rod body 71, the synchronous movement connecting piece 74 drives the traction sleeve 72 on the traction portion 7 in the other pressure relief valve 2 to move upward synchronously, the two extrusion rings 73 are located in the through cavity 52, and the lower end opening of the through cavity 52 is not enough for the extrusion ring 73 to pass through, based on the movement of the traction portion 7 on the other pressure relief valve 2, the unlocking push rod 55 is inserted into the pin hole 51 to unlock the sliding seat 5 locked by the locking portion 6.

[0034] Specifically, it needs to be explained that in the embodiment, the synchronous moving connecting piece 74 can be selected as an L-shaped hard rod, which mainly functions to pull the traction sleeve 72 on the traction part 7 in the other pressure relief valve 2 to move synchronously upward with the upward movement of the rod body 71. When one of the pressure relief valves 2 is relieved, the sliding seat 5 on the pressure relief valve 2 connected with the mud pump body 1 is in a normal locking state. With the increase of the pressure of the mud in the mud pump body 1, the valve disc 22 of the pressure relief valve 2 moves upward along the valve body 21 under the push of the mud in the mud pump body 1. With the movement of the valve disc 22, the valve disc 22 moves synchronously upward with the rod body 71, the rod body 71 drives the synchronous moving connecting piece 74 to move synchronously upward, the synchronous moving connecting piece 74 drives the traction sleeve 72 in the other pressure relief valve 2 to move upward along the rod body 71 in the corresponding pressure relief valve 2, the traction sleeve 72 moves synchronously with the extrusion ring 73, because the extrusion ring 73 is in the shape of a truncated cone, with the movement of the extrusion ring 73, the inclined side wall of the extrusion ring 73 extrudes the unlocking push rod 55 to slide along the communication channel 53 towards the direction of the pin hole 51, until the unlocking push rod 55 pushes the pin 61 away from the pin hole 51, at this time, the locking part 6 releases the locking of the sliding seat 5, and with the upward movement of the traction sleeve 72, the traction sleeve 72 moves the sliding seat 5 upward along the inner wall of the valve body 21 (i.e. away from the valve disc 22), at this time, the sliding seat 5 pulls the valve disc 22 away from the valve seat 23 through the first spring 24, at this time, the position where the valve disc 22 contacts the valve seat 23 is completely open, then, with the flushing of the flushing part 4 into the pressure relief valve 2 (specifically, the pressure relief valve 2 not connected with the mud pump body 1), the flushing liquid can quickly clean the mud residues between the valve disc 22 and the valve seat 23, at this time, the flushing liquid does not need to have strong water pressure to push the valve disc 22 open first and then clean the area between the valve disc 22 and the valve seat 23, at this time, when cleaning the pressure relief valve 2, the side of the adjusting communication part 3 close to the pressure relief valve 2 will not be subjected to excessive pressure, the adjusting communication part 3 only needs to bear the pressure from the direction of the mud pump body 1, thereby reducing the wear of the adjusting communication part 3, improving the service life of the adjusting communication part 3, and reducing the replacement efficiency of the adjusting communication part 3.When the pressure relief valve 2 connected with the mud pump body 1 completes the pressure relief process, the valve disc 22 on the pressure relief valve 2 for pressure relief is re-attached to the surface of the valve seat 23 under the action of the first spring 24, at this time, the pressure relief valve 2 is closed, with the re-closing between the valve disc 22 and the valve seat 23, the rod body 71 connected with the valve disc 22 moves downward, the synchronous movement connecting piece 74 connected with the other pressure relief valve 2 on the traction sleeve 72 also moves downward, at this time, the fourth spring 75 connected with the other pressure relief valve 2 on the traction sleeve 72 releases the accumulated elasticity to push the traction sleeve 72 to move downward, the traction sleeve 72 with the extrusion ring 73 thereon also gradually leaves the position of the communication channel 53, until the lower end surface of the extrusion ring 73 abuts against the lower end surface of the through cavity 52, and with the downward movement of the traction sleeve 72, the extrusion ring 73 pushes the lower end surface of the through cavity 52 to drive the sliding seat 5 to move downward, when the sliding seat 5 moves to the position of the locking part 6, the pin column 61 is pushed into the corresponding pin hole 51 under the action of the third spring 62 to re-achieve the locking of the sliding seat 5, at this time, the pressure relief valve 2 is in a closed state, waiting for subsequent pressure relief process.

[0035] Obviously, in the embodiment, when the pressure relief valve 2 normally performs the pressure relief work, the high pressure from the mud will act on the sliding seat 5 through the valve disc 22 and the first spring 24, at this time, the pin column 61 for locking the sliding seat 5 will be subjected to a larger force, in order to maintain the stability of the locking of the sliding seat 5, the pin column 61 needs to be made of high-strength material, and in order to improve the stability of the locking of the sliding seat 5, the number of pin columns 61 on both sides of the sliding seat 5 can also be increased.

[0036] Further, the inner wall of the valve body 21 is also provided with a rectangular spiral groove 26, and the side wall of the sliding seat 5 is fixedly installed with a sliding block (not shown in the figure), which is inserted into the rectangular spiral groove 26.

[0037] Specifically, with the pressure relief of the pressure relief valve 2 connected with the mud pump body 1, the sliding seat 5 in the other pressure relief valve 2 not connected with the mud pump body 1 moves upward under the action of the traction sleeve 72 connected therewith (the movement process is consistent with the above embodiment, which will not be described here), in the upward movement process of the sliding seat 5, the sliding block on the sliding seat 5 slides along the rectangular spiral groove 26 on the inner wall of the valve body 21 to rotate the sliding seat 5, and the sliding seat 5 rotates while rotating the valve disc 22 inside the valve body 21 through the first spring 24, at this time, because the flushing part 4 introduces cleaning liquid into the inside of the pressure relief valve 2 for cleaning, with the rotation of the valve disc 22, the cleaning liquid can better take away the mud adhered to the valve disc 22, improving the cleaning effect of the valve disc 22.

[0038] Certain exemplary embodiments of the present application have been described above by way of illustration, and it is to be understood that various modifications will be apparent to those of ordinary skill in the art, without departing from the spirit and scope of the present application. Accordingly, the above description is to be construed as illustrative only and not as limiting of the scope of the present application.

Claims

1. A relief mechanism for a slurry pump of a shield tunneling machine, comprising a slurry pump body having a relief valve connected thereto, characterized in that, The pressure relief valve is provided with two, the mud pump body is also provided with adjusting communication part and flushing part, the adjusting communication part adjusts mud pump body and one of the pressure relief valve is communicated, the flushing part to another pressure relief valve water injection flushing.

2. The slurry pump pressure relief mechanism for a tunneling machine of claim 1, wherein, The pressure relief valve includes a valve body connected to the mud pump body, a pressure relief port is opened on the valve body, a valve clack is connected in the valve body by a first spring, a valve seat is arranged in the valve body, and the valve seat and the valve clack are matched to realize sealing, the first spring provides elastic force to keep the valve clack in a closed state, when the internal pressure of the mud pump body overcomes the elastic force of the first spring, the fluid pushes the valve clack to open to release pressure.

3. The slurry pump pressure relief mechanism for a tunneling machine of claim 2, wherein, The valve body is provided with a sliding seat, the sliding seat is connected to the side of the first spring away from the valve clack, the valve body is also provided with a locking part, the locking part is used to lock the sliding seat, when the locking part locks the sliding seat, the valve clack and the valve seat realize sealing.

4. The slurry pump pressure relief mechanism for a tunneling machine of claim 3, wherein, The two pressure relief valves are provided with a traction part, when one of the pressure relief valves is opened under the pressure of the fluid in the mud pump body, the traction part drives the locking part in the other pressure relief valve to unlock the sliding seat, and drives the sliding seat to move upward with the first spring away from the corresponding valve clack.

5. The slurry pump pressure relief mechanism for a tunneling machine of claim 3, wherein, At least two pin holes for locking are opened on the circumference of the sliding seat.

6. The slurry pump pressure relief mechanism for a tunneling machine of claim 5, wherein, The locking part includes a pin column matched with the pin hole, the pin column is connected to the valve body by a third spring, when the pin column is inserted into the pin hole, the locking of the sliding seat is completed.

7. The slurry pump pressure relief mechanism for a tunneling machine of claim 6, wherein, A through cavity is opened in the center of the sliding seat, two communication channels are opened in the sliding seat, the two communication channels communicate the pin holes on both sides with the through cavity in the middle, an unlocking push rod is slidably installed in the communication channel by a second spring, based on the movement of the traction part on the other pressure relief valve, the unlocking push rod is inserted into the pin hole to unlock the sliding seat by the locking part.

8. The slurry pump pressure relief mechanism for a tunneling machine of claim 7, wherein, The traction part includes a rod body connected to the valve clack, the rod body passes through the through cavity, a traction sleeve is sleeved on the outside of the rod body, the traction sleeve is connected to the valve body by a fourth spring, a pressing ring is fixedly installed on the upper end of the traction sleeve, the pressing ring is a circular truncated cone, the side wall of the pressing ring abuts against the unlocking push rod on both sides, a synchronous movement connecting piece is arranged on the rod body, the other end of the synchronous movement connecting piece passes through the valve body and is connected to the traction sleeve on the traction part inside the valve body, based on the upward movement of the rod body, the synchronous movement connecting piece drives the traction sleeve on the traction part in the other pressure relief valve to move upward synchronously.

9. The slurry pump pressure relief mechanism for a tunneling machine of claim 8, wherein, Two pressing rings are located in the through cavity, the lower end of the through cavity is not large enough for the pressing ring to pass through.

10. The slurry pump pressure relief mechanism for a tunneling machine of claim 8, wherein, A rectangular spiral groove is opened on the inner wall of the valve body, a sliding block is fixedly installed on the side wall of the sliding seat, and the sliding block is inserted into the rectangular spiral groove.

Images