A mixer for a gas cushion chamber of a shield tunneling machine

Abstract

The application discloses a kind of agitator for air cushion bin of shield machine, it is related to the field of agitator, including the stirring module being arranged in air cushion bin, stirring module includes drive assembly, several fishing material assemblies, several stirring assemblies and crushing assembly, filter grid is fixedly installed in air cushion bin, drive assembly can drive fishing material assembly and stirring assembly circumferential movement;Stirring module further includes extrusion assembly, fishing material assembly includes fishing material box, feeding door and discharge door, extrusion assembly includes feeding extrusion ring and discharge extrusion ring, the feeding port is opened in the side of fishing material box in moving direction, the discharge port is opened in the side of fishing material box away from filter grid, when fishing material assembly moves to filter grid position, feeding door opens feeding port.Prevent large stone from blocking pipeline, the waterproof performance requirement of crushing assembly is low, improve the service life of crushing assembly, reduce the resistance when crushing action, small particle stone will not enter crushing assembly, improve crushing efficiency.

Description

Technical Field

[0001] This invention relates to the field of agitators, and particularly to an agitator for a tunnel boring machine air cushion chamber. Background Technology

[0002] A tunnel boring machine (TBM) is a type of tunnel boring machine that uses the shield tunneling method. The TBM construction method involves building (laying) the tunnel's "shield" (referring to supporting segments) while excavating. This differs from open-cut construction methods. TBMs are mainly used in the tunneling stages of infrastructure projects such as railways, highways, subways, and water conservancy. The working principle of a TBM is based on geological surveys. According to the TBM's design parameters, its cutterhead excavates the soil, and the excavated soil is removed by excavation machinery. Simultaneously, the TBM's shell protects the excavated face to prevent soil collapse. Then, precast concrete segments are installed through a pipe following at the tail, forming the tunnel's inner wall. As the TBM advances, the tunnel is formed.

[0003] Stability is achieved by balancing the water pressure on the working face using slurry pressure. Slurry pressure primarily serves a supporting role during tunneling. The slurry pressure at any point on the working face is always greater than the groundwater pressure, creating an outward hydraulic gradient that maintains the working face's stability. In slurry balance theory, the formation of a mud film is crucial. When the slurry pressure exceeds the groundwater pressure, the slurry seeps into the soil, forming suspended particles in a certain proportion with the soil pores. These particles are captured and accumulate at the contact surface with the slurry, thus forming a mud film. Over time, the thickness of the mud film increases, and its infiltration resistance gradually strengthens. When the mud film resistance is much greater than the face earth pressure, a slurry balance effect is achieved. A closed baffle is installed behind the cutterhead of a mechanical shield tunnel. The space between the baffle and the cutterhead is called the slurry chamber. Slurry, a mixture of water, clay, and additives, is pumped into the slurry chamber through a pipeline. Once the slurry chamber is full and under pressure, a slurry pressure chamber is formed. Through the pressurization of the slurry and the pressure-maintaining mechanism, excavation can be sustained. To ensure the stability of the working face, during shield tunneling, the soil and sand cut by the rotating cutterhead are agitated by a mixing device to form high-concentration slurry. This slurry is then transported to the surface slurry separation system via fluid transport. The soil and water are separated, and the filtered slurry is then pumped back into the slurry chamber. This cycle continuously completes the excavation, soil removal, and tunneling process. The indirect control type slurry system is characterized by its dual air and slurry system. Inside the shield slurry chamber, a semi-partition divides the chamber into two parts. In front of the semi-partition... The shield is filled with pressurized mud, and compressed air is added behind the diaphragm above the shield axis to form an air pressure buffer layer. The air pressure acts on the mud contact surface behind the diaphragm. Since the air and liquid have the same pressure on the contact surface, the corresponding support pressure on the excavation surface can be determined by adjusting the air pressure. When the shield is excavating, the amount of mud entering and leaving will be unbalanced due to mud loss or changes in the shield's advance speed. Due to the elastic effect of the air buffer layer, when the liquid level fluctuates, it has no significant impact on the change of support mud pressure.

[0004] Chinese patent application CN108194089A discloses a slurry loop circulation system for a slurry shield tunneling machine, including an excavation chamber and an air cushion chamber. A slurry pump is connected to a main slurry inlet pipe. The main slurry inlet pipe is connected to the excavation chamber via several first branch slurry inlet pipes. The lower side of the air cushion chamber is connected to the main slurry inlet pipe via several second branch slurry inlet pipes. The lower side of the excavation chamber is connected to the main slurry discharge pipe via a first branch slurry discharge pipe. The lower side of the air cushion chamber is connected to the main slurry discharge pipe via a second branch slurry discharge pipe. A first flushing system is connected between the cutterhead panel and the main slurry inlet pipe. A second flushing system is connected to the agitator, slurry gate, and the top of the excavation chamber. The main slurry inlet pipe and the main slurry discharge pipe are connected via a bypass pipe. A sensor is installed at the output port of the slurry pump and the input port of the slurry discharge pump. Both the ball valve and the sensor are connected to the control system. By optimizing the slurry flow method and increasing the number of backup pipes, the slurry processing efficiency is improved, and the probability of blockage at the slurry outlet is reduced.

[0005] The aforementioned patents and prior art also have the following defects: Because the air cushion chamber contains a large amount of gravel particles, when discharging sludge, the gravel settles to the bottom of the air cushion chamber, which can easily cause pipe blockage and reduce the amount of sludge carried by the sludge. When the tunnel boring machine cutterhead is cutting, the stone particles cut by the cutterhead are small. Some soil layers and stones have cracks and gaps, which are easily knocked off along the gaps after being hit by the cutterhead. The detached stone particles are large, and the large stones have poor suspension effect after mixing, and the settling speed is fast, which can easily cause pipe blockage. In addition, the mixing rod is prone to hitting large gravel during the mixing process, which can cause deformation and wear of the mixing rod, resulting in a short service life of the mixing rod. Adding a stone crusher in the air cushion chamber will increase the burden on the stone crusher and reduce the crushing efficiency because there are still a large number of small gravel particles in the air cushion chamber that do not need to be crushed.

[0006] Therefore, this application provides a mixer for the air cushion chamber of a tunnel boring machine to meet the requirements. Summary of the Invention

[0007] The purpose of this application is to provide a mixer for the air cushion chamber of a tunnel boring machine, which prevents large stones from clogging the pipes, has low requirements for the waterproof performance of the crushing components, improves the service life of the crushing components, reduces resistance during crushing, prevents small stone particles from entering the crushing components, and improves crushing efficiency.

[0008] To achieve the above objectives, this application provides the following technical solution: a mixer for a shield tunneling machine air cushion chamber, comprising a mixing module disposed within the air cushion chamber. The mixing module includes a drive assembly, several material scooping assemblies, several mixing assemblies, and a crushing assembly. A filter grid is fixedly installed inside the air cushion chamber. The drive assembly is capable of driving the material scooping assemblies and the mixing assemblies to move circumferentially. The mixing module also includes an extrusion assembly. The material scooping assembly includes a scooping box, a feed gate, and a discharge gate. The extrusion assembly includes a feed extrusion ring and a discharge extrusion ring. The scooping box has a feed inlet on one side in the direction of movement and a discharge outlet on the side away from the filter grid. When the scooping assembly moves to the position of the filter grid, the feed gate opens the feed inlet, allowing the material on the filter grid to enter the scooping box through the feed inlet. When the scooping assembly moves to a position away from the filter grid, the feed extrusion ring pushes the feed gate to close the feed inlet. When the scooping assembly moves to a position above the crushing assembly, the discharge gate opens the discharge outlet, allowing the material in the scooping box to enter the crushing assembly through the discharge outlet. When the scooping assembly moves to a position away from the crushing assembly, the discharge extrusion ring pushes the discharge gate to close the discharge outlet. The scooping box has filter strip holes on the side away from the feed gate.

[0009] Preferably, the material scooping assembly further includes a fixed rod, a movable block, and a connecting spring. The fixed rod is fixedly installed on the outer wall of the material scooping box via the fixed block. The movable block is sleeved on the fixed rod and slides with it. One end of the connecting spring is fixedly installed on the corresponding fixed block, and the other end of the connecting spring is fixedly installed on the movable block. The connecting spring is sleeved on the fixed rod. The movable block is fixedly installed on the feed gate, and the discharge gate is rotatably connected to the corresponding discharge port position of the material scooping box.

[0010] Preferably, the material scooping assembly further includes a feeding extrusion rod and a discharging extrusion rod. The feeding extrusion ring and the discharging extrusion ring are both fixedly installed on the inner wall of the air cushion chamber. The feeding extrusion rod is fixedly installed on the side of the feeding gate near the feeding extrusion ring, and the discharging extrusion rod is fixedly installed on the side of the discharging gate near the discharging extrusion ring. The feeding extrusion ring has a feeding notch corresponding to the position of the filter grid, and the discharging extrusion ring has a discharging notch corresponding to the position of the crushing assembly.

[0011] Preferably, a plurality of the stirring components are respectively disposed on the corresponding material scooping components. Each stirring component includes a stirring shaft, a plurality of stirring rods and a drive gear. The stirring module also includes a drive gear ring, which is fixedly installed on the inner wall of the air cushion chamber. The drive gear meshes with the drive gear ring. When the drive gear rotates, it can drive the stirring shaft to rotate. The plurality of stirring rods are all fixedly installed on the stirring shaft.

[0012] Preferably, the stirring assembly further includes a driving bevel gear, a driven bevel gear, a transmission belt unit, a connecting shaft, and a transmission shaft. The stirring shaft is rotatably connected to the side of the scooping box away from the feed gate, and the transmission shaft is rotatably connected to the side of the scooping box away from the feed gate. The driving gear is fixedly installed at one end of the connecting shaft, the driving bevel gear is fixedly installed at the other end of the connecting shaft, and the driven bevel gear is fixedly installed on the transmission shaft. The driving bevel gear meshes with the driven bevel gear. The transmission belt unit includes a driving driving pulley, a driving driven pulley, and a connecting belt. The driving driving pulley is fixedly sleeved on the transmission shaft, the driving driven pulley is fixedly sleeved on the stirring shaft, and the connecting belt is sleeved on the driving driving pulley and the driving driven pulley. A protective shell is fixedly installed on the outer wall of the scooping box away from the feed gate. The driving bevel gear, the driven bevel gear, and the transmission belt unit are all disposed inside the protective shell. The stirring shaft passes through the protective shell and is rotatably connected to the protective shell, and the connecting shaft passes through the protective shell and is rotatably connected to the protective shell.

[0013] Preferably, the drive assembly includes a drive motor and a drive shaft. The drive motor is fixedly installed on one inner wall of the air cushion chamber. The material scooping assembly also includes a support rod, which is fixedly installed on the drive shaft.

[0014] Preferably, the crushing assembly includes a crushing housing, a crushing motor, an eccentric wheel, a crushing shaft, a crushing moving plate, a crushing fixed plate, a crushing support rod, a crushing belt unit, and a support rod adjustment unit. The eccentric wheel is driven by the crushing motor through the crushing belt unit. The crushing shaft is fixedly mounted on the eccentric wheel and rotatably connected to the crushing housing. The crushing moving plate is rotatably connected to the eccentric wheel. The crushing fixed plate is fixedly mounted on the crushing housing. One end of the crushing support rod is hinged to the crushing moving plate, and the other end of the crushing support rod is disposed on the support rod adjustment unit.

[0015] Preferably, the strut adjustment unit includes a stop block, an adjustment block, an adjustment screw, a connecting block, a fixed limiting block, and an adjustment limiting block. The side of the adjustment block closest to the stop block is inclined. The fixed limiting block is fixedly installed inside the crushing housing. The stop block horizontally penetrates the fixed limiting block and slides in cooperation with it. The end of the crushing strut away from the crushing moving plate is hinged to the stop block. A limiting groove is vertically formed on the adjustment limiting block, and the adjustment block slides in the limiting groove. The connecting block is fixedly installed on the inner wall of the crushing housing. The adjustment screw is rotatably connected to the top of the adjustment block. The adjustment screw penetrates the connecting block and is threaded in cooperation with it. A rotating block is fixedly installed on the top of the adjustment screw. The top and bottom of the crushing housing are both open.

[0016] Preferably, the crushing belt unit includes a crushing active pulley, a crushing passive pulley, and a drive belt. The crushing active pulley is fixedly installed at the output end of the crushing motor, the crushing passive pulley is fixedly installed on an eccentric wheel, and the drive belt is sleeved on the crushing active pulley and the crushing passive pulley.

[0017] Preferably, a connecting hole is provided on one side of the air cushion chamber near the bottom, a discharge pump is fixedly installed inside the air cushion chamber, the discharge pump is located below the filter grid, the output end of the discharge pump is fixed and connected to a discharge pipe, the discharge pipe passes through the air cushion chamber and extends outward, and an air compressor is fixedly installed near the top of the air cushion chamber.

[0018] In summary, the technical effects and advantages of this invention are as follows: 1. In this invention, the circumferential movement of the material scooping box stirs the mud and water in the air cushion chamber, so that the stone particles in the mud and water are evenly dispersed in the mud and water. The stone particles will not settle and accumulate at the pipe opening and block the pipe. The filter grid filters out large stones. During the circumferential movement of the material scooping box, it can pick up large stones from the filter grid and put them into the crushing component, preventing large stones from blocking the pipe. It can also prevent large stones from accumulating on the filter grid and blocking it. The crushing component can be installed at the top of the air cushion chamber above the mud and water, and will not crush in the mud and water. The requirements for the waterproof performance of the crushing component are low, which improves the service life of the crushing component, reduces the resistance during crushing, and prevents small stone particles from entering the crushing component, thus improving the crushing efficiency. 2. In this invention, the driving component drives the material scooping component to move circumferentially, and the material scooping component drives the stirring component to move circumferentially through the material scooping box. The driving gear rotates on its own while moving on the driving gear ring. The driving gear drives the stirring shaft to rotate, and the stirring shaft drives the stirring rod to rotate. When the material scooping box moves to the mud and water at the bottom of the air cushion chamber, the stirring rod rotates to stir the mud and water, so that the stone particles in the mud and water are evenly distributed in the mud and water, which improves the stirring effect of the mud and water and prevents the pipe from being blocked by the stone particles in the mud and water. 3. In this invention, the diameter of the drive belt is larger than that of the driven pulley, which accelerates the rotation of the stirring rod when the drive gear rotates, resulting in a higher rotation speed of the stirring rod and a better mixing effect on the mud and water. Furthermore, the stirring rod is located on the side of the scooping box away from the feed inlet, so that large pieces of stone in the mud and water do not collide with the large pieces of stone when the stirring rod rotates at high speed. This ensures a good mixing effect while making the stirring rod less prone to damage and extending its service life. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the air cushion chamber and filter grid in this invention; Figure 2 This is a schematic diagram of the structure of the driving component, the material scooping component, the stirring component, the crushing component, and the extrusion component in this invention; Figure 3 This is a schematic diagram of the structure of the air cushion chamber, drive motor, drive shaft and crushing assembly in this invention; Figure 4 For the present invention Figure 3 Enlarged view of section A; Figure 5 This is a schematic diagram of the structure of the filter grid, the material collection box, the feeding door, and the crushing assembly in this invention; Figure 6 For the present invention Figure 5 Enlarged view of section B; Figure 7 This is a schematic diagram of the structure of the air cushion chamber, the pulverizing component, the drive gear ring, and the filter grid in this invention; Figure 8 For the present invention Figure 7 Enlarged view of section C; Figure 9 This is a schematic diagram of the structure of the filter grid, the material collection box, the feed gate, the feed extrusion ring, and the discharge extrusion ring in this invention; Figure 10 For the present invention Figure 9 Enlarged view of section D; Figure 11 This is a schematic diagram of the structure of the crushing shell, the crushing moving plate, the crushing fixed plate, the crushing support rod, and the abutment block in this invention; Figure 12 This is a schematic diagram of the structure of the abutment block, adjusting block, and adjusting screw in this invention; Figure 13 This is a schematic diagram of the structure of the crushing moving plate, crushing stationary plate, eccentric wheel, and crushing motor in this invention.

[0021] In the diagram: 1. Air cushion chamber; 2. Drive assembly; 21. Drive motor; 22. Drive shaft; 3. Material scooping assembly; 31. Material scooping box; 32. Feed gate; 33. Discharge gate; 34. Fixed rod; 35. Moving block; 36. Connecting spring; 37. Feeding extrusion rod; 38. Discharge extrusion rod; 39. Support rod; 4. Mixing assembly; 41. Mixing shaft; 42. Mixing rod; 43. Drive gear; 44. Drive bevel gear; 45. [Unclear - possibly a component or element] 46. ​​Moving bevel gear; 5. Transmission belt unit; 6. Crushing assembly; 7. Crushing housing; 8. Crushing motor; 9. Eccentric wheel; 10. Crushing moving plate; 11. Crushing stationary plate; 22. Crushing support rod; 33. Abutment block; 44. Adjusting block; 55. Adjusting screw; 66. Extrusion assembly; 77. Feed extrusion ring; 88. Discharge extrusion ring; 9. Filter grid; 10. Drive gear ring; 11. Protective housing; 12. Discharge pump; 13. Discharge pipe. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example: Reference Figures 1-13 The agitator for the air cushion chamber of a tunnel boring machine shown includes an agitation module installed in the air cushion chamber 1. The agitation module includes a drive component 2, several material scooping components 3, several agitation components 4, and a crushing component 5. A filter grid 7 is fixedly installed in the air cushion chamber 1. The drive component 2 can drive the material scooping components 3 and agitation components 4 to move circumferentially. The mixing module also includes an extrusion assembly 6, and the material scooping assembly 3 includes a scooping box 31, a feed gate 32, and a discharge gate 33. The extrusion assembly 6 includes a feed extrusion ring 61 and a discharge extrusion ring 62. The scooping box 31 has a feed inlet on one side in the direction of movement and a discharge outlet on the side away from the filter grid 7. When the material scooping assembly 3 moves to the position of the filter grid 7, the feed gate 32 opens the feed inlet, allowing the material on the filter grid 7 to enter the scooping box 31 through the feed inlet. When component 3 moves to the position away from the filter grid 7, the feeding squeezing ring 61 pushes the feeding gate 32 to move and close the feeding port; when the material scooping component 3 moves to the position above the crushing component 5, the discharge gate 33 opens the discharge port, allowing the material in the scooping box 31 to enter the crushing component 5 through the discharge port; when the material scooping component 3 moves to the position away from the crushing component 5, the discharge squeezing ring 62 pushes the discharge gate 33 to move and close the discharge port; the side of the scooping box 31 away from the feeding gate 32 is provided with filter strip holes.

[0024] The filter screen 7 is fixedly installed at the bottom of the air cushion chamber 1. The crushing component 5 is located near the top of the air cushion chamber 1. The material collection box 31 moves circumferentially within the air cushion chamber 1. During its movement in the muddy water, the material collection box 31 agitates the muddy water, ensuring that the stone particles are evenly distributed within it, preventing the stone particles from settling and clogging the pipes. Simultaneously, when the material collection box 31 moves to the position of the filter screen 7, the discharge gate 33 opens the inlet of the material collection box 31, allowing large stones from the filter screen 7 to enter the material collection box 31. The discharge gate 33 then closes the outlet. As the material collection box 31 moves circumferentially, when it moves to the point of detaching from the filter screen 7, the feeding compression ring 61 compresses the discharge gate 33, causing it to move. 3. The movement closes the discharge port, and the mud and small stone particles in the scooping box 31 are discharged through the filter strip holes to prevent the stone particles in the scooping box 31 from falling during the circumferential movement of the scooping box 31. When the scooping box 31 moves to the position of the crushing component 5, the discharge squeezing ring 62 releases the squeezing of the discharge gate 33, causing the discharge gate 33 to rotate and open the discharge port. The stone particles in the scooping box 31 fall into the crushing component 5 through the discharge port. When the scooping box 31 continues to move away from the crushing component 5, the discharge squeezing ring 62 squeezes the discharge gate 33 again, causing the discharge gate 33 to rotate and close the discharge port. The crushing component 5 crushes the large stone particles into small stone particles, which then re-enter the mud and water in the air cushion chamber 1.

[0025] The circular movement of the scouring box 31 agitates the mud and water in the air cushion chamber 1, causing the stone particles to be evenly dispersed in the mud and water. When the mud and water are drained, the stone particles will not settle and accumulate at the pipe opening, clogging the pipe. The filter screen 7 filters out large stones, preventing them from clogging the pipe. Simultaneously, when the scouring box 31 moves to the bottom of the filter screen 7, the inlet gate 32 opens the inlet and the outlet gate 33 closes the outlet, allowing the stone to enter the scouring box 31 through the inlet. As the scouring box 31 continues to move, the inlet gate 32 closes the inlet, and when the scouring box 31 moves to the crushing component 5, the outlet gate 33 opens the outlet. Large stones enter the crushing component 5 and are crushed by it, preventing them from clogging the pipes and from accumulating on the filter screen 7. Furthermore, the scooping box 31, during its circular movement, scoops up large stones from the filter screen 7 and places them into the crushing component 5. This allows the crushing component 5 to be installed at the top of the air cushion chamber 1, above the muddy water, preventing crushing within the muddy water. This reduces the waterproofing requirements of the crushing component 5, extends its service life, reduces resistance during crushing, and prevents small stones from entering the crushing component 5, thus improving crushing efficiency.

[0026] Furthermore, referring to Figures 1-13As shown, the material scooping assembly 3 also includes a fixed rod 34, a movable block 35, and a connecting spring 36. The fixed rod 34 is fixedly installed on the outer wall of the material scooping box 31 through the fixed block. The movable block 35 is sleeved on the fixed rod 34 and slides in cooperation with the fixed rod 34. One end of the connecting spring 36 is fixedly installed on the corresponding fixed block, and the other end of the connecting spring 36 is fixedly installed on the movable block 35. The connecting spring 36 is sleeved on the fixed rod 34. The movable block 35 is fixedly installed on the feed gate 32, and the discharge gate 33 is rotatably connected to the corresponding discharge port position of the material scooping box 31.

[0027] The connecting spring 36 pushes the moving block 35 to move on the fixed rod 34. The moving block 35 drives the feed gate 32 to move, causing the feed gate 32 to disengage from the feed inlet and open the feed inlet. When the scooping box 31 moves away from the filter grid 7, the feeding extrusion ring 61 pushes the feed gate 32 to move. The feed gate 32 drives the moving block 35 to extrude the connecting spring 36. The connecting spring 36 stores force, and the feed gate 32 closes the feed inlet. The discharge extrusion ring 62 extrudes the discharge gate 33, causing the discharge gate 33 to close the discharge outlet. When the scooping box 31 moves to the crushing assembly 5, the discharge extrusion ring 62 contacts the discharge gate 33 and extrudes it. The discharge gate 33 rotates and opens the discharge outlet.

[0028] Furthermore, referring to Figures 1-13 As shown, the material collection assembly 3 also includes a feeding extrusion rod 37 and a discharging extrusion rod 38. The feeding extrusion ring 61 and the discharging extrusion ring 62 are both fixedly installed on the inner wall of the air cushion chamber 1. The feeding extrusion rod 37 is fixedly installed on the side of the feeding gate 32 near the feeding extrusion ring 61, and the discharging extrusion rod 38 is fixedly installed on the side of the discharging gate 33 near the discharging extrusion ring 62. The feeding extrusion ring 61 has a feeding notch at the position corresponding to the filter grid 7, and the discharging extrusion ring 62 has a discharging notch at the position corresponding to the crushing assembly 5.

[0029] When the scooping box 31 moves to the position of the filter grid 7, the feeding extrusion rod 37 is located at the feeding notch. The connecting spring 36 pushes the feeding gate 32 to open the feeding port. When the scooping box 31 moves to the position away from the filter grid 7, the feeding extrusion rod 37 disengages from the feeding notch. The feeding extrusion ring 61 pushes the feeding extrusion rod 37 to move. The movement of the feeding extrusion rod 37 closes the feeding port and causes the connecting spring 36 to store force. When the scooping box 31 moves to the position of the crushing assembly 5, the discharge extrusion rod 38 is located at the discharge notch. The discharge gate 33 opens the discharge port in a vertical state under the action of gravity. When the scooping box 31 moves away from the position of the crushing assembly 5, the feeding extrusion rod 37 disengages from the discharge notch. The discharge extrusion ring 62 pushes the discharge extrusion rod 38 to move. The discharge extrusion rod 38 drives the discharge gate 33 to rotate. The rotation of the discharge gate 33 closes the discharge port.

[0030] Furthermore, referring to Figures 1-13As shown, several stirring components 4 are respectively set on the corresponding material scooping components 3. The stirring component 4 includes a stirring shaft 41, several stirring rods 42 and a drive gear 43. The stirring module also includes a drive gear ring 8, which is fixedly installed on the inner wall of the air cushion chamber 1. The drive gear 43 meshes with the drive gear ring 8. When the drive gear 43 rotates, it can drive the stirring shaft 41 to rotate. Several stirring rods 42 are all fixedly installed on the stirring shaft 41.

[0031] The drive assembly 2 drives the material scooping assembly 3 to move in a circular motion. The material scooping assembly 3 drives the stirring assembly 4 to move in a circular motion via the material scooping box 31. The drive gear 43 rotates on its own while moving on the drive gear ring 8. The drive gear 43 drives the stirring shaft 41 to rotate. The stirring shaft 41 drives the stirring rod 42 to rotate. When the material scooping box 31 moves to the mud and water at the bottom of the air cushion chamber 1, the stirring rod 42 rotates to stir the mud and water, so that the stone particles in the mud and water are evenly distributed in the mud and water, which improves the stirring effect of the mud and water and prevents the pipe from being blocked by the stone particles in the mud and water.

[0032] Furthermore, referring to Figures 1-13 As shown, the stirring assembly 4 also includes a driving bevel gear 44, a driven bevel gear 45, a transmission belt unit 46, a connecting shaft, and a transmission shaft. The stirring shaft 41 is rotatably connected to the side of the scooping box 31 away from the feed gate 32, and the transmission shaft is rotatably connected to the side of the scooping box 31 away from the feed gate 32. The driving gear 43 is fixedly installed at one end of the connecting shaft, the driving bevel gear 44 is fixedly installed at the other end of the connecting shaft, and the driven bevel gear 45 is fixedly installed on the transmission shaft. The driving bevel gear 44 and the driven bevel gear 45 mesh with each other. The transmission belt unit 46 includes a transmission belt. The system includes a drive pulley, a driven pulley, and a connecting belt. The drive pulley is fixedly mounted on the drive shaft, the driven pulley is fixedly mounted on the agitator shaft 41, and the connecting belt is mounted on both the drive pulley and the driven pulley. A protective shell 9 is fixedly installed on the outer wall of the scooping box 31 away from the feed gate 32. The drive bevel gear 44, the driven bevel gear 45, and the drive belt unit 46 are all located inside the protective shell 9. The agitator shaft 41 passes through the protective shell 9 and is rotatably connected to it. The connecting shaft also passes through the protective shell 9 and is rotatably connected to it.

[0033] During the circular movement of the stirring assembly 4, the drive gear 43 moves on the drive gear ring 8, the drive gear 43 rotates, the drive gear 43 drives the connecting shaft to rotate, the connecting shaft drives the active bevel gear 44 to rotate, the active bevel gear 44 drives the passive bevel gear 45 to rotate, the passive bevel gear 45 drives the transmission shaft to rotate, the transmission shaft drives the transmission active belt pulley to rotate, the transmission active belt pulley drives the transmission passive belt pulley to rotate through the connecting belt, the transmission passive belt pulley drives the stirring shaft 41 to rotate, and the stirring shaft 41 drives the stirring rod 42 to rotate.

[0034] The diameter of the drive belt is larger than that of the driven pulley, which allows the drive gear 43 to rotate faster and drive the stirring rod 42 to rotate, resulting in a higher rotation speed of the stirring rod 42 and a better mixing effect on the mud and water. Furthermore, the stirring rod 42 is located on the side of the scooping box 31 away from the feed inlet, so large pieces of stone in the mud and water do not collide with the large pieces of stone when the stirring rod 42 rotates at high speed. This ensures a good mixing effect while also making the stirring rod 42 less prone to damage and extending its service life.

[0035] Furthermore, referring to Figures 1-13 As shown, the drive assembly 2 includes a drive motor 21 and a drive shaft 22. The drive motor 21 is fixedly installed on the inner wall of one side of the air cushion chamber 1. The material scooping assembly 3 also includes a support rod 39, which is fixedly installed on the drive shaft 22. The material scooping box 31 is fixedly installed on one end of the support rod 39.

[0036] The drive motor 21 drives the drive shaft 22 to rotate, the drive shaft 22 drives the support rod 39 to move circumferentially, and the support rod 39 drives the material collection box 31 to move.

[0037] Furthermore, referring to Figures 1-13 As shown, the crushing assembly 5 includes a crushing housing 51, a crushing motor 52, an eccentric wheel 53, a crushing shaft, a crushing moving plate 54, a crushing fixed plate 55, a crushing support rod 56, a crushing belt unit, and a support rod adjustment unit. The eccentric wheel 53 is connected to the crushing motor 52 via the crushing belt unit. The crushing shaft is fixedly mounted on the eccentric wheel 53 and rotatably connected to the crushing housing 51. The crushing moving plate 54 is rotatably connected to the eccentric wheel 53. The crushing fixed plate 55 is fixedly mounted on the crushing housing 51. One end of the crushing support rod 56 is hinged to the crushing moving plate 54, and the other end of the crushing support rod 56 is mounted on the support rod adjustment unit.

[0038] The material hopper 31 pushes large stones between the crushing moving plate 54 and the crushing stationary plate 55. The crushing motor 52 drives the eccentric wheel 53 to rotate. The eccentric wheel 53 drives the crushing shaft to rotate around the axis of the eccentric wheel 53. The eccentric wheel 53 drives the crushing moving plate 54 to move up and down and left and right. The bottom of the crushing moving plate 54 is supported by the crushing support rod 56. When the crushing moving plate 54 moves upward, it is pushed by the crushing support rod 56 to move towards the crushing stationary plate 55. The moving crushing moving plate 54 squeezes the large stones, crushes them, and then they fall.

[0039] Furthermore, referring to Figures 1-13As shown, the strut adjustment unit includes a stop block 57, an adjustment block 58, an adjustment screw 59, a connecting block, a fixed limiting block, and an adjustment limiting block. The side of the adjustment block 58 closest to the stop block 57 is inclined. The fixed limiting block is fixedly installed inside the crushing housing 51. The stop block 57 horizontally penetrates the fixed limiting block and slides with it. The end of the crushing strut 56 away from the crushing moving plate 54 is hinged to the stop block 57. A limiting groove is vertically opened on the adjustment limiting block. The adjustment block 58 slides in the limiting groove. The connecting block is fixedly installed on the inner wall of the crushing housing 51. The adjustment screw 59 is rotatably connected to the top of the adjustment block 58. The adjustment screw 59 penetrates the connecting block and is threaded with it. A rotating block is fixedly installed on the top of the adjustment screw 59. The top and bottom of the crushing housing 51 are both open.

[0040] By rotating the adjusting screw 59, the adjusting screw 59 moves upward, causing the adjusting block 58 to move upward. The upward movement of the adjusting block 58 pushes the abutment block 57 to move horizontally through the inclined plane, thereby adjusting the position of the crushing support rod 56, thus adjusting the distance between the bottom of the crushing moving plate 54 and the crushing fixed plate 55, and adjusting the degree of crushing of the stone.

[0041] Furthermore, referring to Figures 1-13 As shown, the crushing belt unit includes a crushing active pulley, a crushing passive pulley, and a drive belt. The crushing active pulley is fixedly installed at the output end of the crushing motor 52, the crushing passive pulley is fixedly installed on the eccentric wheel 53, and the drive belt is sleeved on the crushing active pulley and the crushing passive pulley.

[0042] The crushing motor 52 drives the crushing active belt pulley to rotate, which in turn drives the crushing passive belt pulley to rotate via the transmission belt. The crushing passive belt pulley then drives the eccentric wheel 53 to rotate.

[0043] Furthermore, referring to Figures 1-13 As shown, a connecting hole is provided on one side of the air cushion chamber 1 near the bottom. A discharge pump 10 is fixedly installed inside the air cushion chamber 1. The discharge pump 10 is located below the filter grid 7. The output end of the discharge pump 10 is fixed and connected to a discharge pipe 11. The discharge pipe 11 passes through the air cushion chamber 1 and extends outward. An air compressor is fixedly installed near the top of the air cushion chamber 1.

[0044] The stones and soil cut by the tunnel boring machine's cutter head enter the slurry chamber, where they mix with water to form slurry containing both large and small stone particles. The slurry chamber is connected to the air cushion chamber 1 via a connecting hole. The slurry and stones in the slurry chamber enter the air cushion chamber 1 through the connecting hole. An air compressor supplies compressed air into the air cushion chamber 1, creating pressure in both the air cushion chamber 1 and the slurry chamber. This pressurized slurry acts on the cutting surface of the soil layer being cut by the tunnel boring machine. Under the action of pressure, the slurry... The pressurized mud and water enter the gaps between the soil and stone materials, and fills the gaps with pressure, stabilizing the soil layer and preventing groundwater from seeping out during the tunnel boring machine's cutting process. The pressurized mud and water has a certain supporting force, and filling the gaps between the soil and stone materials can increase the stability of the soil layer. The discharge pump 10 discharges the mud and water and stone materials in the air cushion chamber 1 to the tail of the tunnel boring machine through the discharge pipe 11. The discharged mud and water is cleaned of stone impurities and additives are added before being recycled back to the mud and water chamber.

[0045] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mixer for a shield tunneling machine air cushion chamber, comprising a mixing module disposed within the air cushion chamber (1), characterized in that: The mixing module includes a drive assembly (2), several material scooping assemblies (3), several mixing assemblies (4) and a crushing assembly (5). A filter grid (7) is fixedly installed inside the air cushion chamber (1). The drive assembly (2) can drive the material scooping assembly (3) and the mixing assembly (4) to move in a circular motion. The mixing module also includes an extrusion assembly (6). The material scooping assembly (3) includes a scooping box (31), a feed gate (32), and a discharge gate (33). The extrusion assembly (6) includes a feed extrusion ring (61) and a discharge extrusion ring (62). The scooping box (31) has a feed inlet on one side of the moving direction and a discharge outlet on the side of the scooping box (31) away from the filter grid (7). When the material scooping assembly (3) moves to the position of the filter grid (7), the feed gate (32) opens the feed inlet, allowing the material on the filter grid (7) to enter the scooping box (31) through the feed inlet. When the material scooping assembly (3) moves to the position of the filter grid (7), the feed gate (32) opens the feed inlet, allowing the material on the filter grid (7) to enter the scooping box (31) through the feed inlet. (3) When the material moves to the position away from the filter grid (7), the feeding squeezing ring (61) pushes the feeding gate (32) to move and close the feeding port; when the material scooping assembly (3) moves to the position above the crushing assembly (5), the discharge gate (33) opens the discharge port, so that the material in the scooping box (31) can enter the crushing assembly (5) through the discharge port; when the material scooping assembly (3) moves to the position away from the crushing assembly (5), the discharge squeezing ring (62) pushes the discharge gate (33) to move and close the discharge port; the scooping box (31) has filter strip holes on the side away from the feeding gate (32); The material scooping assembly (3) also includes a feeding extrusion rod (37) and a discharging extrusion rod (38). The feeding extrusion ring (61) and the discharging extrusion ring (62) are both fixedly installed on the inner wall of the air cushion chamber (1). The feeding extrusion rod (37) is fixedly installed on the side of the feeding gate (32) near the feeding extrusion ring (61). The discharging extrusion rod (38) is fixedly installed on the side of the discharging gate (33) near the discharging extrusion ring (62). The feeding extrusion ring (61) has a feeding notch corresponding to the position of the filter grid (7). The discharging extrusion ring (62) has a discharging notch corresponding to the position of the crushing assembly (5). The feed extrusion ring (61) and the discharge extrusion ring (62) are arranged in a ring shape; The material scooping assembly (3) further includes a fixed rod (34), a movable block (35), and a connecting spring (36). The fixed rod (34) is fixedly installed on the outer wall of the material scooping box (31) through the fixed block. The movable block (35) is sleeved on the fixed rod (34) and slides with the fixed rod (34). One end of the connecting spring (36) is fixedly installed on the corresponding fixed block, and the other end of the connecting spring (36) is fixedly installed on the movable block (35). The connecting spring (36) is sleeved on the fixed rod (34). The movable block (35) is fixedly installed on the feed gate (32). The discharge gate (33) is rotatably connected to the corresponding discharge port position of the material scooping box (31). The drive assembly (2) includes a drive motor (21) and a drive shaft (22). The drive motor (21) is fixedly installed on the inner wall of one side of the air cushion chamber (1). The material scooping assembly (3) also includes a support rod (39). The support rod (39) is fixedly installed on the drive shaft (22). The material scooping box (31) is fixedly installed on one end of the support rod (39).

2. The agitator for the air cushion chamber of a tunnel boring machine according to claim 1, characterized in that: Several stirring components (4) are respectively arranged on the corresponding material scooping components (3). The stirring component (4) includes a stirring shaft (41), several stirring rods (42) and a drive gear (43). The stirring module also includes a drive gear ring (8). The drive gear ring (8) is fixedly installed on the inner wall of the air cushion chamber (1). The drive gear (43) meshes with the drive gear ring (8). When the drive gear (43) rotates, it can drive the stirring shaft (41) to rotate. Several stirring rods (42) are all fixedly installed on the stirring shaft (41).

3. The agitator for the air cushion chamber of a tunnel boring machine according to claim 2, characterized in that: The stirring assembly (4) further includes a driving bevel gear (44), a driven bevel gear (45), a transmission belt unit (46), a connecting shaft, and a transmission shaft. The stirring shaft (41) is rotatably connected to the side of the scooping box (31) away from the feed gate (32). The transmission shaft is rotatably connected to the side of the scooping box (31) away from the feed gate (32). The driving gear (43) is fixedly installed at one end of the connecting shaft, the driving bevel gear (44) is fixedly installed at the other end of the connecting shaft, and the driven bevel gear (45) is fixedly installed on the transmission shaft. The driving bevel gear (44) meshes with the driven bevel gear (45). The transmission belt unit (46) includes... The transmission includes a drive pulley, a driven pulley, and a connecting belt. The drive pulley is fixedly sleeved on the drive shaft, the driven pulley is fixedly sleeved on the stirring shaft (41), and the connecting belt is sleeved on the drive pulley and the driven pulley. A protective shell (9) is fixedly installed on the outer wall of the scooping box (31) away from the feed gate (32). The drive bevel gear (44), the driven bevel gear (45), and the transmission belt unit (46) are all located inside the protective shell (9). The stirring shaft (41) passes through the protective shell (9) and is rotatably connected to the protective shell (9). The connecting shaft passes through the protective shell (9) and is rotatably connected to the protective shell (9).

4. The agitator for the air cushion chamber of a tunnel boring machine according to claim 1, characterized in that: The crushing assembly (5) includes a crushing housing (51), a crushing motor (52), an eccentric wheel (53), a crushing shaft, a crushing moving plate (54), a crushing fixed plate (55), a crushing support rod (56), a crushing belt unit, and a support rod adjustment unit. The eccentric wheel (53) is connected to the crushing motor (52) via the crushing belt unit. The crushing shaft is fixedly mounted on the eccentric wheel (53) and rotatably connected to the crushing housing (51). The crushing moving plate (54) is rotatably connected to the eccentric wheel (53). The crushing fixed plate (55) is fixedly mounted on the crushing housing (51). One end of the crushing support rod (56) is hinged to the crushing moving plate (54), and the other end of the crushing support rod (56) is mounted on the support rod adjustment unit.

5. The agitator for the air cushion chamber of a tunnel boring machine according to claim 4, characterized in that: The strut adjustment unit includes a stop block (57), an adjustment block (58), an adjustment screw (59), a connecting block, a fixed limiting block, and an adjustment limiting block. The side of the adjustment block (58) near the stop block (57) is inclined. The fixed limiting block is fixedly installed inside the crushing housing (51). The stop block (57) horizontally penetrates the fixed limiting block and slides in cooperation with it. The end of the crushing strut (56) away from the crushing moving plate (54) is hinged to the stop block (57). A limiting groove is vertically opened on the adjustment limiting block. The adjustment block (58) slides in the limiting groove. The connecting block is fixedly installed on the inner wall of the crushing housing (51). The adjustment screw (59) is rotatably connected to the top of the adjustment block (58). The adjustment screw (59) penetrates the connecting block and is threaded in cooperation with it. A rotating block is fixedly installed on the top of the adjustment screw (59). The top and bottom of the crushing housing (51) are both open.

6. The agitator for the air cushion chamber of a tunnel boring machine according to claim 5, characterized in that: The crushing belt unit includes a crushing active pulley, a crushing passive pulley, and a transmission belt. The crushing active pulley is fixedly installed at the output end of the crushing motor (52), the crushing passive pulley is fixedly installed on the eccentric wheel (53), and the transmission belt is sleeved on the crushing active pulley and the crushing passive pulley.

7. The agitator for the air cushion chamber of a tunnel boring machine according to claim 1, characterized in that: A connecting hole is provided on one side of the air cushion chamber (1) near the bottom. A discharge pump (10) is fixedly installed inside the air cushion chamber (1). The discharge pump (10) is located below the filter grid (7). The output end of the discharge pump (10) is fixed and connected to a discharge pipe (11). The discharge pipe (11) passes through the air cushion chamber (1) and extends outward. An air compressor is fixedly installed near the top of the air cushion chamber (1).

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