Cutter-replaceable tunneling device for shield system

Abstract

The invention relates to the technical field of shield tunneling, and discloses a cutter-replaceable tunneling device for a shield system. A plurality of through holes are formed in the tunneling end face of a cutter head shell; the mounting plate is slidably arranged in the cutterhead shell, a plurality of assembling columns are rotationally connected to the mounting plate and correspond to the through holes one to one, mounting bosses are fixedly connected to the assembling columns in the circumferential direction, cutter boxes are detachably connected to the mounting bosses, the end faces, away from the assembling columns, of the cutter boxes are open, and scrapers are arranged in the cutter boxes; the cutter box can be inserted into the through hole, so that the scraper is positioned on the tunneling end surface of the cutter head shell; the switching mechanism is used for driving the multiple assembly columns to rotate. By means of the scraper switching device, rapid scraper switching operation can be achieved, long-time shutdown is not needed, and high-efficiency tunneling operation is effectively kept.

Description

Technical Field

[0001] The present invention relates to the technical field of shield tunneling, in particular to a cutter-changeable tunneling device for a shield system. Background Art

[0002] At present, shield machines are being used more and more widely in subway construction. As one of the important components of the shield machine, the cutterhead will directly affect the performance and efficiency of the shield machine. In the existing technology, the cutter of the shield machine is usually installed on the end face of the tool holder, so as to complete the rapid cutting of rock and soil in the forward direction.

[0003] Scrapers are primarily used for excavating earth and discharging slurry. During construction, the scraper's cutting edge scrapes the soil layer, carrying the soil and gravel into the slurry bin, which is then discharged through the conveying system, thereby propelling the shield machine forward. Due to the long time required for tunnel excavation, scrapers are often damaged. Existing scrapers are usually fixed to the cutterhead, making replacement difficult, resulting in long downtime for maintenance and reducing construction efficiency. Summary of the Invention

[0004] The object of the present invention is to provide a cutter-changeable tunneling device for a shield system, aiming to solve or improve at least one of the above-mentioned technical problems.

[0005] To achieve the above-mentioned object, the present invention provides the following solution: The present invention provides a tool-changeable tunneling device for a shield system, comprising:

[0006] The cutterhead housing has a plurality of through holes on its excavation end face;

[0007] A mounting plate is slidably disposed inside the cutterhead housing, a plurality of mounting posts being rotatably connected to the mounting plate, the plurality of mounting posts corresponding one-to-one to the plurality of through holes, a mounting boss being fixedly connected circumferentially to the mounting posts, a knife box being detachably connected to the mounting boss, the knife box being open at an end face away from the mounting posts, a scraper being disposed in the knife box, the knife box being capable of being inserted into the through holes so that the scraper is located on the excavation end face of the cutterhead housing;

[0008] A switching mechanism, used for driving the plurality of assembly columns to rotate;

[0009] A displacement mechanism is used to drive the mounting plate to slide in the cutter head housing.

[0010] Optionally, the switching mechanism includes:

[0011] A motor is arranged on the mounting plate, wherein the output shaft of the motor is fixedly connected to the driving bevel gear;

[0012] A plurality of connecting rods are coaxially fixedly connected to the plurality of assembly columns one by one, and driven bevel gears are fixedly connected to the connecting rods. The plurality of driven bevel gears are meshed with the driving bevel gears.

[0013] Optionally, a bearing seat is rotatably connected to the connecting rod, and the bearing seat is fixedly connected to the mounting plate via a support rod.

[0014] Optionally, notch grooves are respectively provided at both ends of the mounting boss, and plug blocks are respectively fixedly connected to both ends of the knife box, the plug blocks correspond to and are plugged into the notch grooves, a first bolt hole is provided through the plug block, and a second bolt hole is provided on the bottom surface of the notch groove, and the first bolt hole and the second bolt hole are detachably connected by bolts.

[0015] Optionally, the insert block is provided with a countersunk hole located at the end of the first bolt hole.

[0016] Optionally, the bolt is a hexagon socket bolt.

[0017] Optionally, the displacement mechanism is a first telescopic cylinder, which is fixedly mounted on the inner side wall of the cutter head housing, and the output end of the first telescopic cylinder is fixedly connected to the mounting plate.

[0018] Optionally, a plurality of reinforcing support blocks are fixedly connected to the side wall of the mounting boss, and a plurality of splicing grooves are opened on the side wall of the through hole. When the knife box is inserted into the through hole, the reinforcing support blocks are inserted into the splicing grooves.

[0019] Optionally, a fixed plate is further included, and a plurality of second telescopic cylinders are arranged between the fixed plate and the end face of the cutter disc housing away from its excavation end face. The plurality of second telescopic cylinders are arranged circumferentially along the fixed plate, and the two ends of the second telescopic cylinders are respectively hinged to the fixed plate and the cutter disc housing through a hinge seat.

[0020] Optionally, a ball joint seat is provided between the fixing plate and the cutter disc housing.

[0021] The present invention discloses the following technical effects: a displacement mechanism is used to drive the mounting plate to slide in the cutter disc housing, thereby adjusting the positions of multiple assembly columns on the mounting plate, and then controlling the position of the knife box on the assembly column, so that the knife box can be switched between inserting into the through hole and disengaging from the through hole; when the knife box is disengaged from the through hole and retracted into the interior of the cutter disc housing, the switching mechanism is used to drive multiple assembly columns to rotate, so that another knife box on the assembly column corresponds to the through hole, and the displacement mechanism drives the knife box to be inserted into the through hole so that the new scraper is located on the excavation end face of the cutter disc housing, thereby realizing fast scraper switching operation, without the need for long-term shutdown, and effectively maintaining high-efficiency excavation operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is another perspective schematic diagram of the present invention;

[0025] Figure 3 It is a schematic structural diagram of the switching mechanism and displacement mechanism of the present invention;

[0026] Figure 4 This is a schematic diagram of the assembly column structure of the present invention;

[0027] Figure 5 A cross-sectional view of the mounting boss and the knife box of the present invention;

[0028] Figure 6 It is a schematic diagram of the splicing groove structure of the present invention.

[0029] In the figure: 1. Cutter head housing; 2. Through hole; 3. Mounting plate; 4. Assembly column; 5. Mounting boss; 6. Cutter box; 7. Scraper; 8. Motor; 9. Driving bevel gear; 10. Connecting rod; 11. Driven bevel gear; 12. Bearing seat; 13. Support rod; 14. Notch groove; 15. Insert block; 16. First bolt hole; 17. Second bolt hole; 18. Bolt; 19. Countersunk hole; 20. First telescopic cylinder; 21. Reinforced support block; 22. Splicing groove; 23. Fixing plate; 24. Second telescopic cylinder; 25. Articulated seat; 26. Ball joint seat. DETAILED DESCRIPTION

[0030] The existing Chinese patent discloses a shield machine cutter head CN112112664A. When the device is used, when the cutter head rotates rapidly to dig a tunnel, the surface of the cutter head is provided with a wear-resistant alloy plate and the edge is also provided with a wear-resistant material, which greatly improves the wear resistance of the device, thereby increasing the service life of the device. When the cutter head is working, the scraper, drill bit and raised blade simultaneously crush the tunnel and start excavation. The drill bit, scraper and raised blade are located at a higher position and the surrounding area is inclined to the collection tank. While excavating at full speed, the crushed debris enters the crushing chamber through the material guide port for crushing. Under the action of the crushing rod, the incoming debris is completely crushed and then separated from the cutter head through the filter screen, thereby avoiding the obstruction of stones that have not been completely crushed. Jamming the cutter disc affects the normal operation of the cutter disc. When the raised blade needs to be replaced, the hydraulic rod is started to extend to facilitate the removal of the raised blade, and then the new raised blade is engaged with the second block through the groove opened therein, and then the hydraulic rod is started to retract. During the contraction, the grooves opened on both sides of the raised blade are tightly fitted with the first block, and one side of the hydraulic rod is rotatably connected to the connecting rod through the rotating shaft. During the contraction, the connecting rod rotates slowly, and the angle between the connecting rod and the hydraulic rod continues to increase, squeezing the limit block at one end thereof to slide inside the fixed block. When the hydraulic rod is completely contracted, the limit block is just squeezed and engaged into the slot opened by the fixed rod, which plays a limiting role. The two ends of the fixed rod are elastically connected by springs, which can play a protective role when the cutter disc studio is violently shaken.

[0031] The existing Chinese patent discloses a telescopic shield machine cutterhead CN212614726U, which includes a cutterhead, a cutterhead fixed on the cutterhead, and a cutterhead reinforced with a reinforcing rod and the cutterhead. A first blade is welded on the cutterhead, and a second blade is welded on the outer wall of the cutterhead. A center rod is fixedly installed on the cutterhead, and an inner ring is fixedly embedded in the cutterhead. The center rod rotates through the inner ring, and a third blade is welded on the center rod. A drill bit is welded on the center rod, and a spiral blade is welded on the drill bit 17. When excavation is required, the cutterhead drives the cutterhead to rotate, so that the first blade, the second blade, the third blade and the center rod rotate. First, the center rod rotates, so that the drill bit and the spiral blade rotate, so that the central part of the excavation soil layer can be penetrated. Then, the third blade cooperates with the protrusion 2 to gradually excavate the center position.

[0032] The existing Chinese patent discloses a shield machine cutterhead telescopic mechanism CN210370650U. When excavation is required, the driven gear is socketed with the upper and lower bidirectional threaded shafts. At this time, the motor starts to drive the rotating shaft and the driving gear to rotate. At the same time, the two sliding blocks in the upper and lower symmetrical sliding assemblies slide relative to each other for a certain distance, pushing the cutterhead forward a certain distance, which is convenient for later replacement of tools and reserves replacement space in advance, improves the convenience of tool change, and enhances work efficiency. Then, when the excavation angle needs to be changed, the hydraulic press starts to drive the telescopic shaft, thereby driving the connection state of the driven gear and the upper and lower bidirectional threaded shafts of the rotating plate industry. When the driven gear is only connected to the bidirectional threaded shaft on one side, the two sliding blocks on that side continue to slide relative to each other, thereby realizing the change of the excavation angle of the cutterhead. Among them, the connecting rods all use conventional telescopic connecting rods, which are convenient for the state change of the connecting rod when the angle is changed, thereby improving the stability of the equipment.

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Reference Figures 1-6 The present invention provides a tool-changeable tunneling device for a shield system, comprising:

[0036] The cutterhead housing 1 has a plurality of through holes 2 formed on the excavation end face;

[0037] The mounting plate 3 is slidably disposed inside the cutterhead housing 1. A plurality of mounting posts 4 are rotatably connected to the mounting plate 3. The plurality of mounting posts 4 correspond one to one with the plurality of through holes 2. A mounting boss 5 is fixedly connected to the circumference of the mounting post 4. A knife box 6 is detachably connected to the mounting boss 5. The end face of the knife box 6 away from the mounting post 4 is open. A scraper 7 is disposed in the knife box 6. The knife box 6 can be inserted into the through hole 2 so that the scraper 7 is located on the excavation end face of the cutterhead housing 1.

[0038] A switching mechanism for driving the plurality of assembly columns 4 to rotate;

[0039] The displacement mechanism is used to drive the mounting plate 3 to slide in the cutter head housing 1 .

[0040] The mounting plate 3 is driven to slide in the cutter disc housing 1 by the displacement mechanism, thereby adjusting the position of multiple assembly columns 4 on the mounting plate 3, and then the position of the knife box 6 on the assembly column 4 is controlled, so that the knife box 6 can be switched between inserting into the through hole 2 and disengaging from the through hole 2. After the knife box 6 is out of the through hole 2 and retracted into the inside of the cutter disc housing 1, the multiple assembly columns 4 are driven to rotate by the switching mechanism, so that another knife box 6 on the assembly column 4 corresponds to the through hole 2, and the displacement mechanism drives the knife box 6 to be inserted into the through hole 2 so that the new scraper 7 is located on the excavation end face of the cutter disc housing 1, thereby realizing a fast scraper 7 switching operation without the need for long-term downtime, effectively maintaining high-efficiency excavation operations.

[0041] In one embodiment of the present invention, the switching mechanism includes:

[0042] The motor 8 is mounted on the mounting plate 3, and the output shaft of the motor 8 is fixedly connected to the driving bevel gear 9;

[0043] A plurality of connecting rods 10 are coaxially fixedly connected to the plurality of assembly columns 4 . A driven bevel gear 11 is fixedly connected to the connecting rod 10 . The plurality of driven bevel gears 11 are meshed with the driving bevel gear 9 .

[0044] The motor 8 drives the active bevel gear 9 to rotate, and the active bevel gear 9 drives multiple driven bevel gears 11 to rotate, thereby driving the assembly column 4 to rotate through the connecting rod 10, so that the multiple assembly columns 4 can rotate synchronously, so that the scrapers 7 corresponding to the multiple through holes 2 can be switched synchronously, reducing the application of the driving source and improving the switching efficiency.

[0045] A bevel gear transmission is a mechanical device that transmits power and motion by intersecting the axes of two bevel gears that mesh with each other. Its core principle is to use the meshing between the gears to achieve speed and torque conversion and ensure adaptive adjustment of the direction of motion.

[0046] When the driving bevel gear 9 rotates, its tooth surface contacts the tooth surface of the driven bevel gear 11 in turn and drives the driven gear to rotate. The tooth profile curves of the two gears (such as involutes) ensure that the instantaneous transmission ratio is constant during the meshing process, achieving smooth power transmission.

[0047] The direction of rotation of the driving bevel gear 9 and the driven bevel gear 11 is determined by factors such as the number of teeth and the installation position. For example, when the driving bevel gear 9 rotates clockwise, the driven bevel gear 11 may rotate counterclockwise or clockwise, depending on the gear ratio and the installation method.

[0048] In one embodiment of the present invention, a bearing seat 12 is rotatably connected to the connecting rod 10 , and the bearing seat 12 is fixedly connected to the mounting plate 3 via a support rod 13 .

[0049] The axial position of the connecting rod 10 is limited by the bearing seat 12 , and is thus connected to the mounting plate 3 via the support rod 13 , so that the assembly column 4 maintains a rotatable and fixed connection state with the mounting plate 3 .

[0050] The bearing seat 12 capable of limiting axial displacement includes a thrust bearing and a one-way / two-way thrust ball bearing.

[0051] Thrust bearings are specially designed to bear axial loads. Their structural features include:

[0052] Thrust ball bearings: Single or double direction models can limit the axial displacement of the shaft in one or two directions, but cannot limit the radial displacement.

[0053] Thrust roller bearings (such as thrust cylindrical roller bearings and thrust tapered roller bearings): have higher load-bearing capacity and can withstand both axial and radial loads, but the radial load must be less than 55% of the axial load.

[0054] Assembly method:

[0055] Inner ring fixing: Common methods include shaft shoulder positioning, elastic ring snapping into shaft groove, round nut with lock washer, etc.

[0056] Outer ring fixing: The outer ring displacement is limited by means of bearing seat boss, bearing cover compression or elastic retaining ring in the hole.

[0057] If necessary, use a thrust roller bearing in combination with a shaft shoulder and bearing cover fixing solution.

[0058] In one embodiment of the present invention, a notch groove 14 is respectively provided at both ends of the mounting boss 5, and an insert block 15 is respectively fixedly connected to both ends of the knife box 6. The insert block 15 corresponds to and is plugged into the notch groove 14. A first bolt hole 16 is provided through the insert block 15, and a second bolt hole 17 is provided on the bottom surface of the notch groove 14. The first bolt hole 16 and the second bolt hole 17 are detachably connected by a bolt 18.

[0059] By providing the notch groove 14 and the insert block 15, it is convenient to assemble and dock the mounting boss 5 with the knife box 6, and by the cooperation of the bolt 18 with the first bolt hole 16 and the second bolt hole 17, it is convenient to quickly disassemble and assemble the mounting boss 5 and the knife box 6, so that the damaged scraper 7 can be quickly replaced when the work is stopped.

[0060] In one embodiment of the present invention, the insert block 15 is provided with a countersunk hole 19 at the end of the first bolt hole 16 .

[0061] The countersunk hole 19 enables the head of the bolt 18 to be lower than the surface of the insert block 15 , thereby avoiding protrusions that affect assembly.

[0062] In one embodiment of the present invention, the bolt 18 is a hexagon socket bolt.

[0063] The load-bearing surface of the hexagonal socket screw is a hexagonal structure. Compared with slotted or cross screws, its load-bearing area is larger and can withstand higher loads. The nut can be sunk into the workpiece through the countersinking process to maintain a smooth and beautiful surface. It is suitable for scenes with high requirements on appearance.

[0064] In one embodiment of the present invention, the displacement mechanism is a first telescopic cylinder 20, which is fixedly mounted on the inner wall of the cutterhead housing 1. The output end of the first telescopic cylinder 20 is fixedly connected to the mounting plate 3. The expansion and contraction of the first telescopic cylinder 20 drives the mounting plate 3 to generate displacement.

[0065] In one embodiment of the present invention, a plurality of reinforcing support blocks 21 are fixedly connected to the side wall of the mounting boss 5 , and a plurality of splicing grooves 22 are opened on the side wall of the through hole 2 . When the knife box 6 is inserted into the through hole 2 , the reinforcing support blocks 21 are inserted into the splicing grooves 22 .

[0066] In order to avoid the large amount of force exerted on the scraper 7 being transferred to the assembly column 4 during the excavation process, causing deformation of the assembly column 4, the blade box 6 is inserted into the through hole 2, and the reinforcing support block 21 is also inserted into the splicing groove 22. By strengthening the contact between the side wall of the support block 21 and the side wall of the splicing groove 22, the force exerted on the scraper 7 is dispersed to the cutter head housing 1, thereby reducing the force exerted on the assembly column 4 and improving the overall service life of the device.

[0067] In one embodiment of the present invention, a fixed plate 23 is further included, and a plurality of second telescopic cylinders 24 are arranged between the fixed plate 23 and the end face of the cutter head housing 1 away from its excavation end face. The plurality of second telescopic cylinders 24 are arranged circumferentially along the fixed plate 23, and the two ends of the second telescopic cylinders 24 are respectively hinged to the fixed plate 23 and the cutter head housing 1 through a hinge seat 25.

[0068] It is connected to the assembly position in the tunneling system through a fixed plate 23, and multiple second telescopic cylinders 24 are set between the fixed plate 23 and the cutterhead housing 1. By extending and retracting any second telescopic cylinder 24, the angle of the cutterhead housing 1 can be adjusted, and then the tunneling direction of the shield system can be autonomously adjusted to achieve efficient tunneling.

[0069] In one embodiment of the present invention, a ball joint seat 26 is provided between the fixing plate 23 and the cutter head housing 1 to strengthen the connection strength between the fixing plate 23 and the cutter head housing 1 .

[0070] The ball joint seat 26 realizes the multi-directional rotation function in three-dimensional space through the spherical hinge structure, and is combined with a horizontal sliding or limiting device to adapt to structural deformation and load transfer.

[0071] The core of the ball joint consists of three parts:

[0072] The upper / lower support plates connect the upper structure and the foundation respectively. They are made of high-strength steel such as Q345B and are equipped with an anchoring system to ensure stable force transmission.

[0073] The spherical hinge assembly includes a spherical crown liner and a spherical slide. The precision-machined spherical contact achieves a rotational freedom of ±0.02-0.08rad, and the center of rotation is fixed at the center of the sphere.

[0074] The first telescopic cylinder 20 and the second telescopic cylinder 24 may preferably be drill boom telescopic cylinders or telescopic hydraulic cylinders.

[0075] The drill arm telescopic cylinder consists of a cylinder body, a piston rod and a sealing assembly. It is mainly used for the telescopic adjustment of the shield machine cutter head to adapt to construction needs under different geological conditions.

[0076] The telescopic hydraulic cylinder adopts a multi-stage sleeve-shaped piston rod design, which realizes long-stroke telescopic movement through the hydraulic system and is commonly used in the propulsion system of shield machines.

[0077] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0078] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A tool-changeable tunneling device for a shield system, characterized in that: include: The cutterhead housing (1) has a plurality of through holes (2) formed on its excavation end surface; A mounting plate (3) is slidably arranged inside the cutter head housing (1); a plurality of mounting posts (4) are rotatably connected to the mounting plate (3); the plurality of mounting posts (4) correspond one to one with the plurality of through holes (2); a mounting boss (5) is fixedly connected to the circumference of the mounting post (4); a knife box (6) is detachably connected to the mounting boss (5); the knife box (6) is open at the end face away from the mounting post (4); a scraper (7) is arranged in the knife box (6); the knife box (6) can be inserted into the through hole (2) so that the scraper (7) is located on the excavation end face of the cutter head housing (1); A switching mechanism for driving the plurality of assembly columns (4) to rotate; A displacement mechanism is used to drive the mounting plate (3) to slide within the cutter head housing (1).

2. The tool-changeable tunneling device for a shield system according to claim 1, characterized in that: The switching mechanism includes: A motor (8) is arranged on the mounting plate (3), and an output shaft of the motor (8) is fixedly connected to a driving bevel gear (9); A plurality of connecting rods (10) are coaxially fixedly connected to the plurality of assembly columns (4), and a driven bevel gear (11) is fixedly connected to the connecting rods (10). The plurality of driven bevel gears (11) are meshed with the driving bevel gear (9).

3. The tool-changeable tunneling device for a shield system according to claim 2, characterized in that: A bearing seat (12) is rotatably connected to the connecting rod (10), and the bearing seat (12) is fixedly connected to the mounting plate (3) via a support rod (13).

4. The tool-changeable tunneling device for a shield system according to claim 1, characterized in that: The two ends of the mounting boss (5) are respectively provided with notch grooves (14), and the two ends of the knife box (6) are respectively fixedly connected with plug blocks (15), and the plug blocks (15) correspond to and are plugged into the notch grooves (14). A first bolt hole (16) is provided on the plug block (15) and a second bolt hole (17) is provided on the bottom surface of the notch groove (14). The first bolt hole (16) and the second bolt hole (17) are detachably connected by bolts (18).

5. The tool-changeable tunneling device for a shield system according to claim 4, characterized in that: The insert block (15) is provided with a countersunk hole (19) located at the end of the first bolt hole (16).

6. The tool-changeable tunneling device for a shield system according to claim 4, characterized in that: The bolt (18) is a hexagon socket bolt.

7. The tool-changeable tunneling device for a shield system according to claim 1, characterized in that: The displacement mechanism is a first telescopic cylinder (20), which is fixedly mounted on the inner wall of the cutter head housing (1), and an output end of the first telescopic cylinder (20) is fixedly connected to the mounting plate (3).

8. The tool-changeable tunneling device for a shield system according to claim 1, characterized in that: A plurality of reinforcing support blocks (21) are fixedly connected to the side wall of the mounting boss (5), and a plurality of splicing grooves (22) are provided on the side wall of the through hole (2). When the knife box (6) is inserted into the through hole (2), the reinforcing support blocks (21) are inserted into the splicing grooves (22).

9. The tool-changeable tunneling device for a shield system according to claim 1, characterized in that: It also includes a fixed plate (23), and a plurality of second telescopic cylinders (24) are arranged between the fixed plate (23) and the end face of the cutter head housing (1) away from its excavation end face. The plurality of second telescopic cylinders (24) are arranged along the circumference of the fixed plate (23), and the two ends of the second telescopic cylinders (24) are respectively hinged to the fixed plate (23) and the cutter head housing (1) through hinge seats (25).

10. The tool-changeable tunneling device for a shield system according to claim 9, characterized in that: A ball joint seat (26) is provided between the fixing plate (23) and the cutter head housing (1).

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