CN117782666A - Slurry balance shield simulation system - Google Patents

Abstract

The invention belongs to the technical field of shield machines, and discloses a slurry balance shield simulation system which comprises a simulation bin, a feeding device, a driving device and a slurry circulating device. The simulation bin comprises a shell, a front cover plate and a rear cover plate, wherein a feed inlet is formed in the front cover plate, a slurry discharge port and a plurality of slurry inlets are formed in the rear cover plate, and a cutter head is arranged in the simulation bin; the feeding device is communicated with the feeding port; the driving device comprises a first driving motor and a rotating shaft, a cutter disc flushing port is formed in the rotating shaft, and the cutter disc flushing port is communicated with a slurry inlet; the slurry circulation device comprises a slurry inlet pipeline, a slurry discharge pipeline and a slurry treatment mechanism, wherein a filter is arranged on the slurry discharge pipeline and is communicated with the feeding device. Through the arrangement, the process that the real slurry shield muck enters the muck sump, the muck is mixed with the slurry, and the muck is discharged out of the muck sump along with the slurry can be simulated, and the method has great significance in researching the mud cake formation of the cutter disc and the stagnation discharge of the air cushion sump.

Description

Slurry balance shield simulation system

Technical Field

The invention relates to the technical field of shield machines, in particular to a slurry balance shield simulation system.

Background

With the promotion of urban process in China, the demands of infrastructure such as urban rail transit, municipal pipelines, river-crossing tunnels and the like are increasingly increased, and the application of shield construction is increasingly wide. The slurry shield is used as one of shield machines, and is widely applied to underground engineering construction with good stratum adaptability. The working principle of the shield machine is that the shield machine performs grouting into a mud sump through a grouting pipeline, a driving device drives a cutter disc to rotate, soil on an excavation face is cut, and the cut soil enters the mud sump through a cutter disc gap and is discharged through a slurry discharge pipeline after being mixed with slurry.

For large-diameter slurry shields, various problems are often encountered when project construction is carried out, and two common problems are mud cake formation at a cutter head and particle retention at a shield slurry discharge port. The cutter disc mud cake is that fine particles and fragments cut by the shield cutter disc are gathered into semi-solid and solid soil blocks in a mud water bin again, and a large amount of soil blocks are adhered to the central area of the cutter disc. In the tunneling process, the formed cutter disc mud cake can cause the problems of shield pushing speed reduction, cutter disc torque and pushing force increase, cutter disc temperature increase, cutter abrasion aggravation and the like, and the construction progress can be influenced when serious, so that the construction safety is threatened. The particle retention at the slurry discharge port is because part of the large particles have large gravity, and the slurry cannot be discharged through the slurry discharge pipeline, so that the large particles are accumulated near the slurry discharge port. The slurry discharge port is easy to be blocked due to the retention of a large amount of particles, so that the normal operation of a pipeline is affected.

When researching the problems of particle retention at the positions of a mud cake of a research cutter and a shield slurry discharge port, the prototype shield machine has large size, complex structure, large difficulty in developing prototype experiments, high cost and certain safety risk. The existing model experiment is mainly a mechanism experiment, the model is greatly simplified on the prototype, and the process of mixing shield cutting soil, slurry and dregs and discharging slag from the bin body cannot be presented.

Accordingly, a slurry balance shield simulation system is needed to solve the above-mentioned problems.

Disclosure of Invention

The invention aims to provide a slurry balance shield simulation system, which solves the problem that the prior art cannot simulate the process of cutting soil, mixing slurry with dregs and discharging slag in a bin body.

To achieve the purpose, the invention adopts the following technical scheme:

a slurry balance shield simulation system comprising:

the simulation bin comprises a shell, a front cover plate and a rear cover plate, wherein the shell is arranged between the front cover plate and the rear cover plate, a plurality of feeding holes are formed in the front cover plate, a slurry discharging hole and a plurality of slurry inlets are formed in the rear cover plate, and a cutter disc is arranged in the simulation bin;

the feeding device is communicated with the feeding hole and can convey massive particles into the simulation bin through the feeding hole;

the driving device comprises a first driving motor and a rotating shaft, the rotating shaft penetrates through the rear cover plate, one end of the rotating shaft is connected with the rotating output end of the first driving motor, the other end of the rotating shaft is connected with the cutterhead, a cutterhead flushing port is formed in the rotating shaft, and the cutterhead flushing port is communicated with one pulp inlet;

the slurry circulation device comprises a slurry inlet pipeline, a slurry discharge pipeline and a slurry treatment mechanism, wherein a first end of the slurry inlet pipeline is communicated with the slurry inlet port and the cutter head flushing port, a second end of the slurry discharge pipeline is communicated with the slurry treatment mechanism, a first end of the slurry discharge pipeline is communicated with the slurry discharge port, a second end of the slurry discharge pipeline is communicated with the slurry treatment mechanism, a filter is mounted on the slurry discharge pipeline, and the filter is communicated with the feeding device.

Preferably, a partition plate is arranged in the shell, the partition plate divides the shell into a mud water bin and an air cushion bin, a connecting hole is formed in the partition plate, the mud water bin is communicated with the air cushion bin through the connecting hole, the mud water bin is communicated with the air cushion bin through the slurry inlet and the slurry inlet pipeline, and the cutter disc is arranged in the mud water bin.

Preferably, the air cushion bin is provided with an impeller stirrer, the impeller stirrer comprises a second driving motor, a bearing and stirring blades, the air cushion bin is provided with a through hole, the stirring blades are arranged in the air cushion bin, the bearing is arranged in the through hole in a penetrating mode, one end of the bearing is connected with the stirring blades, and the other end of the bearing is connected with a rotary output end of the second driving motor.

Preferably, the slurry treatment mechanism comprises a slurry storage tank, a slurry mixing tank and a sedimentation tank which are sequentially communicated, wherein the slurry storage tank is communicated with the second end of the slurry inlet pipeline, and the sedimentation tank is communicated with the second end of the slurry discharge pipeline.

Preferably, the pulp inlet pipeline comprises a main pulp inlet pipe and a plurality of branch pulp inlet pipes, wherein a first end of the main pulp inlet pipe is communicated with the pulp storage tank, one ends of the branch pulp inlet pipes are communicated with a second end of the main pulp inlet pipe, and the other ends of the branch pulp inlet pipes are respectively connected with the pulp inlet ports in a one-to-one correspondence manner.

Preferably, the main pulp inlet pipe and the branch pulp inlet pipe are respectively provided with a pulp inlet pump, a first electric ball valve, a first flow sensor and a first pressure sensor.

Preferably, the simulation bin is respectively provided with a passive stirring rod flushing pipe, a mud gate flushing pipe, an impeller stirrer flushing pipe, a mud gate rear flushing pipe and a grid flushing pipe, and the passive stirring rod flushing pipe, the mud gate flushing pipe, the impeller stirrer flushing pipe, the mud gate rear flushing pipe and the grid flushing pipe can be connected with a plurality of slurry inlets in one-to-one correspondence.

Preferably, the pulp discharging pipeline is provided with a pulp discharging pump, a second electric ball valve, a second flow sensor, a second pressure sensor and a quarrying box.

Preferably, a plurality of observation ports are arranged at intervals along the circumferential direction of the shell, transparent glass is arranged on each of the observation ports, and the transparent glass is in sealing connection with the shell.

Preferably, the front cover plate comprises an annular framework and a transparent plate, the annular framework is covered on the transparent plate, and a plurality of sensor interfaces are arranged on the annular framework.

The invention has the beneficial effects that:

according to the slurry balance shield simulation system provided by the invention, the rotating shaft is driven to rotate by the first driving motor, so that the cutter head is driven to rotate in the simulation bin, the block particles are conveyed into the simulation bin through the feeding device, so that the cutter head cuts the block particles, the working condition of a cutter head of an actual shield machine for cutting soil can be simulated, slurry in the slurry treatment mechanism is conveyed into the simulation bin through the slurry inlet and onto the cutter head through the slurry inlet and the cutter head flushing opening, the slurry in the simulation bin is mixed with the block particles cut by the cutter head to form a solid-liquid mixture, and the slurry on the cutter head flushes and cools the cutter head to prevent a mud cake from occurring on the cutter head; the solid-liquid mixture in the simulation bin is conveyed to the slurry treatment mechanism through the slurry discharge pipeline through the slurry discharge port for precipitation and filtration treatment, the solid-liquid mixture is filtered through the filter in the process of conveying the slurry discharge pipeline, fine sand filtered by the filter is conveyed to the feeding device, and block particles are formed again to enter the simulation bin for circulation. The slurry balance shield simulation system provided by the embodiment can simulate the processes that the real slurry shield muck enters the muck sump, the muck is mixed with the slurry, the muck is discharged out of the muck sump along with the slurry and the muck is deposited, and has great significance in researching the mud cake formation of the cutter disc and the stagnation discharge of the air cushion sump.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a slurry balance shield simulation system provided by an embodiment of the present invention;

FIG. 2 is a schematic diagram of a simulation cartridge provided by an embodiment of the present invention;

FIG. 3 is a schematic view of a front cover plate according to an embodiment of the present invention;

FIG. 4 is a schematic view of a back cover plate according to an embodiment of the present invention;

FIG. 5 is a front view of a mud treatment mechanism provided by an embodiment of the present invention;

FIG. 6 is a top view of a mud treatment mechanism provided in an embodiment of the present invention;

FIG. 7 is a schematic view of a mud circulation device according to an embodiment of the present invention;

fig. 8 is a partial enlarged view at a in fig. 1.

In the figure:

100. a cutterhead;

1. simulating a bin; 11. a housing; 111. a partition plate; 1111. a connection hole; 112. a mud water bin; 113. an air cushion bin; 1131. a through hole; 114. an impeller mixer; 1141. a second driving motor; 1142. a bearing; 1143. stirring the leaves; 115. an observation port; 116. transparent glass; 12. a front cover plate; 121. a feed inlet; 122. an annular skeleton; 1221. a sensor interface; 13. a back cover plate; 131. a slurry discharge port; 132. a slurry inlet; 133. an air inlet; 134. an exhaust port;

2. a feeding device;

3. a driving device; 31. a first driving motor; 32. a rotating shaft; 321. flushing a port by a cutter head;

4. a mud circulation device; 41. a slurry inlet pipeline; 411. a main slurry inlet pipe; 4111. a slurry inlet pump; 4112. a first electrically operated ball valve; 4113. a first flow sensor; 4114. a first pressure sensor; 412. supporting a slurry inlet pipe; 42. a slurry discharge pipeline; 421. a filter; 422. a pulp outlet pump; 423. a second electric ball valve; 424. a second flow sensor; 425. a second pressure sensor; 426. a quarrying box; 43. a slurry treatment mechanism; 431. a slurry storage tank; 432. a size mixing tank; 433. and (3) a sedimentation tank.

Detailed Description

The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

As shown in fig. 1 to 8, the present embodiment provides a slurry balance shield simulation system including a simulation silo 1, a feeding device 2, a driving device 3, and a slurry circulation device 4. The simulation bin 1 comprises a shell 11, a front cover plate 12 and a rear cover plate 13, wherein the shell 11 is arranged between the front cover plate 12 and the rear cover plate 13, a plurality of feeding holes 121 are formed in the front cover plate 12, a slurry discharging hole 131 and a plurality of slurry inlet holes 132 are formed in the rear cover plate 13, and a cutter disc 100 is arranged in the simulation bin 1; the feeding device 2 is communicated with the feeding hole 121, and the feeding device 2 can convey blocky particles into the simulation bin 1 through the feeding hole 121; the driving device 3 comprises a first driving motor 31 and a rotating shaft 32, the rotating shaft 32 is arranged in the rear cover plate 13 in a penetrating way, one end of the rotating shaft 32 is connected with the rotating output end of the first driving motor 31, the other end of the rotating shaft is connected with the cutterhead 100, a cutterhead flushing port 321 is formed in the rotating shaft 32, and the cutterhead flushing port 321 is communicated with one slurry inlet 132; the slurry circulation device 4 comprises a slurry inlet pipeline 41, a slurry discharge pipeline 42 and a slurry treatment mechanism 43, wherein a first end of the slurry inlet pipeline 41 is communicated with the slurry inlet 132 and the cutter head flushing port 321, a second end of the slurry inlet pipeline 41 is communicated with the slurry treatment mechanism 43, a first end of the slurry discharge pipeline 42 is communicated with the slurry discharge port 131, a second end of the slurry discharge pipeline 42 is communicated with the slurry treatment mechanism 43, a filter 421 is arranged on the slurry discharge pipeline 42, and the filter 421 is communicated with the feeding device 2.

According to the slurry balance shield simulation system provided by the embodiment, the rotating shaft 32 is driven to rotate by the first driving motor 31, so that the cutter head 100 is driven to rotate in the simulation bin 1, the feeding device 2 is used for conveying massive particles into the simulation bin 1 through the feeding hole 121, so that the cutter head 100 is used for cutting massive particles, the working condition of a cutter head 100 of an actual shield machine for cutting soil can be simulated, slurry in the slurry treatment mechanism 43 is conveyed into the simulation bin 1 through the slurry inlet 132 and conveyed onto the cutter head 100 through the slurry inlet 132 and the cutter head flushing hole 321, the slurry in the simulation bin 1 is mixed with massive particles cut by the cutter head 100 to form a solid-liquid mixture, and the slurry on the cutter head 100 is used for flushing and cooling the cutter head 100 to prevent a mud cake on the cutter head 100; the solid-liquid mixture in the simulation bin 1 is conveyed to the slurry treatment mechanism 43 through the slurry discharge pipeline 42 through the slurry discharge port 131 for precipitation filtration treatment, the solid-liquid mixture is filtered through the filter 421 in the conveying process of the slurry discharge pipeline 42, fine sand filtered by the filter 421 is conveyed to the feeding device 2, and block particles are formed again to enter the simulation bin 1 for circulation. The slurry balance shield simulation system provided by the embodiment can simulate the process that the real slurry shield muck enters the mud sump 112, the muck is mixed with the slurry, the muck is discharged out of the mud sump 112 along with the slurry and the muck is deposited, and has great significance for researching the mud cake formation of the cutter head 100 and the stagnation and discharge of the air cushion sump 113.

Specifically, in this embodiment, the simulation bin 1, the feeding device 2, the driving device 3, and the slurry circulation device 4 adopt an equivalent scaling model experimental design method. According to the experimental design of an actual equivalent scaling model, determining that the diameter of the cutterhead 100 in a slurry balance shield simulation system corresponding to a real large shield with the diameter of 15m of the cutterhead 100 is 1.2m, and the scaling factor is 12.5:1, a step of; the inner diameters of the pulp feed pipe 41 and the pulp discharge pipe 42 are 10: 1.

Optionally, as shown in fig. 2 and 4, a partition 111 is disposed in the casing 11, the partition 111 separates the casing 11 into a mud water bin 112 and an air cushion bin 113, a connection hole 1111 is formed in the partition 111, the mud water bin 112 and the air cushion bin 113 are communicated through the connection hole 1111, the mud water bin 112 and the air cushion bin 113 are both communicated with the mud inlet pipeline 41 through a mud inlet 132, and the cutterhead 100 is disposed in the mud water bin 112. It can be understood that the feed inlet 121 and the slurry inlet 132 in this embodiment are both communicated with the slurry tank 112, the main function of the slurry tank 112 is to simulate the actual shield to cut soil, the cutterhead 100 cuts the block particles, then the cut soil and slurry form a solid-liquid mixture, the main function of the air cushion tank 113 is to store compressed air with sufficient volume to ensure the requirement of pressure stabilization, the simulation precision of the actual working condition is improved, the solid-liquid mixture in the slurry tank 112 can flow into the air cushion tank 113 through the connecting hole 1111 to be discharged, and thus the hydraulic balance in the slurry tank 112 is maintained.

Alternatively, as shown in fig. 1, 4 and 8, an impeller mixer 114 is disposed at the air cushion chamber 113, the impeller mixer 114 includes a second driving motor 1141, a bearing 1142 and a mixing blade 1143, a through hole 1131 is formed in the air cushion chamber 113, the mixing blade 1143 is disposed in the air cushion chamber 113, the bearing 1142 is disposed in the through hole 1131 in a penetrating manner, one end of the bearing 1142 is connected with the mixing blade 1143, and the other end of the bearing 1142 is connected with a rotation output end of the second driving motor 1141. In the actual test process, the second driving motor 1141 is started to drive the stirring blade 1143 to rotate, so that the mud-water mixture in the air cushion bin 113 can be stirred to simulate the disturbance effect of the crusher on the actual shield machine on the internal flow field of the crusher, and then whether the slurry and the dregs are mixed, the solid-liquid mixture is discharged and the slurry discharge opening 131 is blocked or not due to the fact that a large amount of particles are prevented from being remained in the slurry discharge opening 131 can be judged. The mud-water mixture in the air cushion bin 113 can be stirred to different degrees by controlling different rotating speeds of the stirring blades 1143, so that the optimal disturbance degree of the mud-water mixture is explored, and a large number of particles are prevented from being remained in the slurry discharge port 131 to the greatest extent. Further, the bearing 1142 in this embodiment is fixed to the inner wall of the air cushion chamber 113 through a bearing housing.

Alternatively, as shown in fig. 2, a plurality of observation ports 115 are provided at intervals along the circumferential direction of the housing 11, and transparent glass 116 is provided on each of the plurality of observation ports 115, and the transparent glass 116 is hermetically connected with the housing 11. The fluid movement condition in the simulation cabin 1 can be observed through the observation port 115, and the illumination can be used for illuminating the inside of the simulation cabin 1 through the observation port 115, so that the stability of the test process is ensured.

Alternatively, as shown in fig. 3, the front cover plate 12 includes an annular skeleton 122 and a transparent plate, the annular skeleton 122 is covered on the transparent plate, and a plurality of sensor interfaces 1221 are provided on the annular skeleton 122. The cutting condition of the cutter head 100 on the block particles in the mud water bin 112 can be observed through the transparent plate, and the normal cutting of the cutter head 100 on the block particles is ensured. The plurality of sensor interfaces 1221 can be externally connected with monitoring equipment, so that the pressure distribution of each position in the muddy water bin 112 can be intuitively observed to simulate the pressure of the cutterhead 100 in the actual shield tunneling machine on the excavated soil body.

Alternatively, as shown in fig. 5 and 6, the slurry treatment mechanism 43 includes a slurry storage tank 431, a slurry mixing tank 432, and a sedimentation tank 433, which are sequentially communicated, the slurry storage tank 431 is communicated with the second end of the slurry inlet pipe 41, and the sedimentation tank 433 is communicated with the second end of the slurry outlet pipe 42. It can be understood that in the actual test process, the solid-liquid mixture flows into the sedimentation tank 433 through the slurry discharging pipeline 42 for sedimentation treatment, larger particles are precipitated to the bottom of the sedimentation tank 433, the muddy water flows into the slurry mixing tank 432 for specific gravity adjustment, the requirement of grouting the simulation bin 1 is met, the adjusted and qualified slurry flows into the slurry storage tank 431 again, and flows into the simulation bin 1 through the slurry inlet pipeline 41, so that the hydraulic balance in the simulation bin 1 is maintained and the workpiece in the simulation bin 1 is flushed.

Specifically, the slurry storage tank 431, the slurry mixing tank 432 and the sedimentation tank 433 in this embodiment are all formed by splicing transparent organic glass, and a tester can see the liquid level height change condition in the slurry storage tank 431, the slurry mixing tank 432 and the sedimentation tank 433 and can observe the quality of slurry at any time through the glass, so that the specific gravity of the slurry can be adjusted at any time, and the accuracy of the test is ensured.

Alternatively, as shown in fig. 1 and 7, the pulp feeding pipeline 41 includes a main pulp feeding pipe 411 and a plurality of branch pulp feeding pipes 412, a first end of the main pulp feeding pipe 411 is communicated with the pulp storage tank 431, one ends of the plurality of branch pulp feeding pipes 412 are communicated with a second end of the main pulp feeding pipe 411, and the other ends are respectively connected with the plurality of pulp feeding ports 132 in a one-to-one correspondence. In this embodiment, the slurry in the slurry storage tank 431 is distributed to a plurality of branch slurry inlet pipes 412 through the main slurry inlet pipe 411, different pipes in the plurality of branch slurry inlet pipes 412 can be respectively communicated with the slurry tank 112 and the air cushion tank 113, and the slurry can enter the slurry tank 112 through the branch slurry inlet pipes 412 to wash the slurry tank 112 and mix with the block particles cut by the cutterhead 100, so as to maintain the hydraulic balance in the slurry tank 112; the slurry enters the air cushion bin 113 through the supporting slurry inlet pipe 412 to wash the air cushion bin 113 so as to prevent solid particles from blocking the air cushion bin 113; mud enters the cutterhead 100 through the branch mud inlet pipe 412 to wash and cool the cutterhead 100, and mud cake formation on the cutterhead 100 is prevented.

Alternatively, as shown in fig. 1 and 7, the main slurry inlet pipe 411 and the branch slurry inlet pipe 412 are provided with a slurry inlet pump 4111, a first electric ball valve 4112, a first flow sensor 4113 and a first pressure sensor 4114. It can be understood that the upper slurry pump 4111 in the main slurry inlet pipe 411 can pump the slurry in the slurry storage tank 431 into the main slurry inlet pipe 411, and the flow rate of the slurry entering the main slurry inlet pipe 411 can be adjusted through the first electric ball valve 4112 on the main slurry inlet pipe 411 so as to meet the actual requirement of the actual simulation bin 1 on the slurry; the slurry in the main slurry inlet pipe 411 can be pumped into the branch slurry inlet pipe 412 through the slurry inlet pump 4111 on the branch slurry inlet pipe 412, and the flow rate of the slurry entering the branch slurry inlet pipe 412 can be regulated through the first electric ball valve 4112 on the branch slurry inlet pipe 412, so that the slurry in the three branch slurry inlet pipes 412 can be conveniently regulated and distributed, and the requirements of the slurry flow rates on the slurry bin 112, the air cushion bin 113 and the rotating shaft 32 can be met; the mud flow in the main mud pipe 411 and the branch mud pipe 412 can be monitored through the first flow sensor 4113, and a tester can adjust the inlet of the first electric ball valve 4112 by observing the first flow sensor 4113, so that the mud flow in the main mud pipe 411 and the branch mud pipe 412 can be adjusted; the pressure of the front and rear pipelines of the slurry pump 4111 can be monitored by the first pressure sensor 4114 to prevent pipe bursting. Specifically, in the present embodiment, on the main slurry inlet pipe 411, the first pressure sensor 4114 is installed before the slurry inlet pump 4111; a first pressure sensor 4114 is mounted on the feed pipe 412 after the feed pump 4111 to facilitate viewing of the front and rear pipe pressure of the feed pump 4111.

Optionally, as shown in fig. 1 and 7, a pulp outlet pump 422, a second electric ball valve 423, a second flow sensor 424, a second pressure sensor 425, and a quarrying tank 426 are provided on the pulp discharge pipe 42. The slurry outlet pump 422 can pump the solid-liquid mixture in the air cushion bin 113 to the slurry discharge pipeline 42 and flow into the sedimentation tank 433, and the second electric ball valve 423 can control the pumping rate of the slurry outlet pump 422 to the solid-liquid mixture in the air cushion bin 113 according to actual test requirements; the tester can control the extraction rate by observing the inlet adjustment of the second electrically operated ball valve 423 by the second flow sensor 424; the pressure of the front and rear pipelines of the slurry pump 422 can be monitored by the second pressure sensor 425 to prevent pipe explosion. The quarrying tank 426 filters large particles in the discharge line 42 to prevent the large particles from clogging the discharge line 42 and the discharge pump 422. Specifically, the quarrying tank 426 is disposed upstream of the slurry pump 422 to block large particles in time. Further, the quarrying tank 426 in the present embodiment is provided with a drainage port, and the solid-liquid mixture in the slurry discharging pipeline 42 can be discharged through the drainage port after the test is finished, so as to prevent the solid-liquid mixture from hardening and blocking the slurry discharging pipeline 42.

Optionally, as shown in fig. 4, a passive stirring rod flushing pipe, a slurry gate flushing pipe, an impeller agitator flushing pipe, a slurry gate rear flushing pipe and a grid flushing pipe are respectively arranged in the simulation bin, and the passive stirring rod flushing pipe, the slurry gate flushing pipe, the impeller agitator flushing pipe, the slurry gate rear flushing pipe and the grid flushing pipe can be connected with the multiple slurry inlets 132 in a one-to-one correspondence manner. It can be understood that, in order to improve the simulation effect on the actual shield working condition, according to the structure of the actual shield machine, the simulation bin 1 in this embodiment is provided with a passive stirring rod, which is disposed in the slurry bin 112 and is used for stirring the sediment in the slurry bin 112, and the passive stirring rod is communicated with the slurry inlet 132 through a passive stirring rod flushing pipe, so that the slurry can flow onto the passive stirring rod to flush the passive stirring rod and mix the slurry with the sediment in the slurry bin 112; according to the structure of an actual shield tunneling machine, the simulation bin 1 in the embodiment is provided with a mud door, the mud door is arranged on a partition 111 between a mud water bin 112 and an air cushion bin 113, the mud water bin 112 and the air cushion bin 113 can be separated, pressure balance in the respective bins is kept, the front of the mud door is communicated with a mud inlet 132 through a mud door flushing pipe, so that the front of the mud door can be flushed, the rear of the mud door is communicated with the mud inlet 132 through a mud door rear flushing pipe, the rear of the mud door can be flushed, and the mud door is prevented from being blocked, so that the opening and the closing are not smooth; according to the structure of the actual shield tunneling machine, the simulation bin 1 in the embodiment is provided with a grating, the grating is arranged in the air cushion bin 113, and can isolate larger stones or soil blocks to prevent blocking of the slurry discharging pipeline 42, and the grating is communicated with the slurry inlet 132 through a grating flushing pipe, so that the grating can be flushed and prevented from being blocked; the impeller agitator is communicated with the slurry inlet 132 through an impeller agitator flushing pipe, and slurry can flush the impeller stirring blades 1143 to prevent the stirring blades 1143 from hardening a mud cake.

Further, as shown in fig. 4, the rear cover plate 13 in this embodiment is further provided with an air inlet 133 and an air outlet 134, both of which are communicated with the air cushion chamber 113, and air can enter the air cushion chamber 113 through the air inlet 133 and be discharged from the air cushion chamber 113 through the air outlet 134, so as to better maintain the pressure balance in the air cushion chamber 113.

Further, in this embodiment, transparent organic glass is respectively disposed at the connection point of the slurry discharging pipeline 42 and the slurry discharging port 131 and on the middle pipe section of the slurry discharging pipeline 42, so that a tester can observe the flow condition of the solid-liquid mixture in the inlet of the slurry discharging pipeline 42 and the middle pipeline through the transparent organic glass, so as to prevent the slurry discharging pipeline 42 from being blocked.

Specifically, the feeding device 2 in this embodiment is a screw conveyor, which is communicated with the feeding port 121 through a pipeline, and in this embodiment, according to a simulation working condition, the amount of the bulk particles to be conveyed into the simulation bin by the screw conveyor needs to be controlled, and the control method includes:

s1: the spiral diameter is determined. D value of the spiral diameter is calculated according to a spiral diameter design formula, and the spiral diameter is rounded, and the calculation formula is as follows:

wherein D is the diameter of the helix, in units of m; k is the material comprehensive coefficient; q is the transport capacity in t/h; c is the inclination angle coefficient; gamma is the bulk density of the material in t/m ³ The method comprises the steps of carrying out a first treatment on the surface of the And ψ is the fill factor.

S2: the pitch of the helix is determined. The helical pitch takes t=0.8d.

Wherein t is a helical pitch, unit m; d is the spiral diameter in m.

S3: and calculating the rotating speed of the screw shaft. The rotation speed of the screw shaft needs to be round and cannot exceed the limit rotation speed n _j The method comprises the following steps:

wherein n is the rotation speed of the rotating shaft, and the unit is r/min; n is n _j Is the limit rotation speed of the screw shaft, and the unit is r/min; a is the comprehensive characteristic coefficient of the material; d is the spiral diameter in m.

S4: and checking the filling coefficient. The filling coefficient is calculated by a formula and needs to be in a recommended range, and the calculation formula is as follows:

wherein ψ is the filling factor; q is the diameter of the round spiral, unit m; d is the diameter of the helix, in m; n is the rotation speed of the round screw shaft, and the unit is r/min; t is the helical pitch, unit m; gamma is the bulk density of the material in t/m ³ The method comprises the steps of carrying out a first treatment on the surface of the C is the tilt angle coefficient.

Wherein, the value of psi is higher than the upper limit of the recommended value, and the spiral diameter D is required to be increased; the value of psi is lower than the recommended lower limit, and the screw shaft rotation speed D is required to be reduced.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (10)

1. A slurry balance shield simulation system, comprising:

the simulation bin (1), the simulation bin (1) comprises a shell (11), a front cover plate (12) and a rear cover plate (13), the shell (11) is arranged between the front cover plate (12) and the rear cover plate (13), a plurality of feeding holes (121) are formed in the front cover plate (12), a slurry discharging hole (131) and a plurality of slurry inlet (132) are formed in the rear cover plate (13), and a cutter disc (100) is arranged in the simulation bin (1);

a feeding device (2) communicated with the feeding hole (121), wherein the feeding device (2) can convey massive particles into the simulation bin (1) through the feeding hole (121);

the driving device (3) comprises a first driving motor (31) and a rotating shaft (32), wherein the rotating shaft (32) penetrates through the rear cover plate (13), one end of the rotating shaft is connected with the rotating output end of the first driving motor (31), the other end of the rotating shaft is connected with the cutterhead (100), a cutterhead flushing port (321) is formed in the rotating shaft (32), and the cutterhead flushing port (321) is communicated with one pulp inlet (132);

mud circulation device (4), including advance thick liquid pipeline (41), row thick liquid pipeline (42) and mud processing mechanism (43), advance the first end of thick liquid pipeline (41) with advance thick liquid mouth (132) intercommunication, the second end with mud processing mechanism (43) intercommunication, the first end of row thick liquid pipeline (42) with row thick liquid mouth (131) intercommunication, the second end with mud processing mechanism (43) intercommunication, install filter (421) on row thick liquid pipeline (42), filter (421) with feeder (2) intercommunication.

2. The slurry balance shield simulation system according to claim 1, wherein a partition plate (111) is arranged in the casing (11), the partition plate (111) divides the casing (11) into a slurry sump (112) and an air cushion sump (113), a connecting hole (1111) is formed in the partition plate (111), the slurry sump (112) and the air cushion sump (113) are communicated through the connecting hole (1111), the slurry sump (112) and the air cushion sump (113) are both communicated with the slurry inlet pipeline (41) through the slurry inlet (132), and the cutter head (100) is arranged in the slurry sump (112).

3. The slurry balance shield simulation system according to claim 2, wherein an impeller stirrer (114) is arranged at the air cushion bin (113), the impeller stirrer (114) comprises a second driving motor (1141), a bearing (1142) and stirring blades (1143), a through hole (1131) is formed in the air cushion bin (113), the stirring blades (1143) are arranged in the air cushion bin (113), the bearing (1142) is arranged in the through hole (1131) in a penetrating manner, one end of the bearing is connected with the stirring blades (1143), and the other end of the bearing is connected with a rotary output end of the second driving motor (1141).

4. The slurry balance shield simulation system according to claim 2, wherein the slurry treatment mechanism (43) comprises a slurry storage tank (431), a slurry mixing tank (432) and a sedimentation tank (433) which are sequentially communicated, the slurry storage tank (431) is communicated with the second end of the slurry inlet pipeline (41), and the sedimentation tank (433) is communicated with the second end of the slurry outlet pipeline (42).

5. The slurry balance shield simulation system according to claim 4, wherein the slurry inlet pipeline (41) comprises a main slurry inlet pipe (411) and a plurality of branch slurry inlet pipes (412), a first end of the main slurry inlet pipe (411) is communicated with the slurry storage tank (431), one ends of the plurality of branch slurry inlet pipes (412) are communicated with a second end of the main slurry inlet pipe (411), and the other ends of the plurality of branch slurry inlet pipes are respectively connected with the plurality of slurry inlet ports (132) in a one-to-one correspondence manner.

6. The slurry balance shield simulation system according to claim 5, wherein the main slurry inlet pipe (411) and the branch slurry inlet pipe (412) are provided with a slurry inlet pump (4111), a first electric ball valve (4112), a first flow sensor (4113) and a first pressure sensor (4114).

7. The slurry balance shield simulation system according to claim 5, wherein a passive stirring rod flushing pipe, a slurry gate flushing pipe, an impeller mixer flushing pipe, a slurry gate rear flushing pipe and a grid flushing pipe are respectively arranged in the simulation bin (1), and the passive stirring rod flushing pipe, the slurry gate flushing pipe, the impeller mixer flushing pipe, the slurry gate rear flushing pipe and the grid flushing pipe can be connected with a plurality of slurry inlets (132) in a one-to-one correspondence.

8. The slurry balance shield simulation system according to claim 1, wherein a slurry outlet pump (422), a second electric ball valve (423), a second flow sensor (424), a second pressure sensor (425) and a quarrying tank (426) are arranged on the slurry discharge pipeline (42).

9. The slurry balance shield simulation system according to claim 1, wherein a plurality of observation ports (115) are arranged at intervals along the circumferential direction of the housing (11), transparent glass (116) is arranged on each of the observation ports (115), and the transparent glass (116) is in sealing connection with the housing (11).

10. The slurry balance shield simulation system according to claim 1, wherein the front cover plate (12) comprises an annular skeleton (122) and a transparent plate, the annular skeleton (122) is covered on the transparent plate, and a plurality of sensor interfaces (1221) are arranged on the annular skeleton (122).