Anti-clamping type shield tunneling machine

Abstract

The anti-clamping type shield tunneling structure comprises a cutterhead, a front shield, a telescopic shield, a rear shield, a supporting shoe assembly and an anti-clamping structure which are arranged from front to back, the anti-clamping structure comprises a supporting assembly and a protection assembly, and the supporting height of the supporting assembly is gradually decreased from one side to the other side in the circumferential direction; the sliding face of the protection assembly is gradually heightened from one side to the other side in the circumferential direction. The anterior shield is machined into a double-layer structure, when a first air bag in the anterior shield is extruded, the first air bag is stressed to exhaust air, the air enters a first sliding groove, an inserting plate is ejected out to be clamped into a positioning inserting groove of a cutter head, and the cutter head and a supporting assembly are locked; the cutter head can drive the supporting assembly to rotate, so that the multiple anti-clamping structures are simultaneously retracted inwards in the radial direction, the outer diameter of the anterior shield is reduced, the clamping strength of surrounding rock and the anterior shield is reduced, and escape is achieved through hole shrinkage. And the second air bag can introduce gas with certain pressure into the positioning slot, so that the inserting plate is ejected out, the cutter head is separated from the front shield, and normal tunneling operation after escaping is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of tunnel excavation, and in particular to an anti-stuck shield excavation structure. Background Art

[0002] A tunnel boring machine (TBM), also known as a shield machine, is a type of engineering machinery used to excavate underground tunnels. Its excavation section primarily consists of a front shield, a cutterhead, a telescopic shield, and a holding shield (with holding shoes installed on the outside). The cutterhead is mounted at the front end of the front shield, and the front shield is equipped with a rotary power source that rotates the cutterhead and a main driving force (a high-tonnage hydraulic cylinder) that propels the cutterhead forward. During excavation, the holding shoes hold the tunnel walls in place and provide a reaction force, while the main driving force propels the cutterhead forward, which rotates and advances a certain distance. However, during excavation, if the soil layer's bearing capacity is insufficient, landslides will occur. Once a landslide occurs, the surrounding rock will become stuck in the front shield. Currently, when the front shield becomes stuck, drilling or blasting is usually performed to clear the surrounding rock at the stuck location to ensure the normal operation of the shield machine. This method has the following defects: first, the stuck position needs to be detected before drilling or blasting, which takes a long time; second, drilling or blasting can easily cause damage to the tunnel or the surrounding environment, increasing the surrounding rock cleaning period. Summary of the Invention

[0003] In view of this, the present invention proposes a TBM shield anti-stuck structure. When the front shield is squeezed by collapsed surrounding rock, the support radius of the front shield can be radially retracted, reducing the clamping force between the surrounding rock and the front shield, making it easier to escape.

[0004] To achieve the above object, the present invention adopts the following technical solutions: The anti-stuck shield tunneling structure of the present invention comprises a cutterhead, a front shield, a telescopic shield and a rear shield arranged in sequence from front to rear, the cutterhead being flange-connected to a rotary power source within the front shield, the front shield comprising a rear shell and a double-layer shield body fixedly connected to the front end of the rear shell; the rear shield being provided with at least two hydraulic cylinder-driven gripper shoe assemblies; the anti-stuck shield tunneling structure further comprises a plurality of anti-stuck structures spaced apart along the circumferential direction of the front shield, each of the anti-stuck structures comprising a support assembly and a protective assembly slidably engaged with the support assembly, the double-layer shield body comprising an inner guard plate and an outer mounting frame spaced apart from the inner guard plate, the outer mounting frame being provided with a plurality of mounting holes, a group of protective assemblies being mounted in each of the mounting holes; The support assembly includes a front support member and a rear support member, the front support member and the rear support member are connected together by a connecting beam, the support heights of the front support member and the rear support member gradually decrease from one side to the other side along the circumferential direction, the two ends of the protective assembly are respectively slidably engaged with the front support member and the rear support member, and the sliding surface of the protective assembly gradually increases from one side to the other side along the circumferential direction; A front guide rail and a rear guide rail in a circular ring structure are provided between the inner guard plate and the outer mounting frame. The front support member is slidably engaged with the front guide rail and its front end portion is located in the front gap enclosed by the outer mounting frame and the inner guard plate. The rear support member is slidably engaged with the rear guide rail. A plug-in plate with a telescopic structure is provided at the front end portion of each front support member. A positioning slot that is one-to-one engaged with the plug-in plate is provided on the rear side surface of the cutter disc. A first slide groove is provided at the front end portion of the front support member, and the plug-in plate is sealed and slidably fitted in the first slide groove; the first airbag of the protective component is connected to the first slide groove through a first pipeline, and when the first airbag passes gas into the first slide groove through the first pipeline, the plug-in plate is pushed out so that it is clamped in the positioning slot of the cutter disc; the second airbag of the support shoe assembly is connected to the positioning slot through a second pipeline, and when the second airbag passes gas into the positioning slot through the second pipeline, the plug-in plate is pushed out so that it is reset to the first slide groove.

[0005] The beneficial effect is as follows: the present invention processes the front shield into a double-layer structure, and a first airbag can be built into the front shield. When the front shield is squeezed, the first airbag is forced to exhaust, and the gas in the first airbag enters the first slide groove, and then pushes out the plug-in plate so that it is stuck in the positioning slot of the cutter disc, thereby realizing a fixed connection between the cutter disc and the support assembly. The rotation of the cutter disc drives the rotation of the support assembly (opposite to the excavation rotation direction), so that multiple anti-stuck structures are radially retracted at the same time, so that the outer diameter of the front shield becomes smaller, thereby reducing the clamping force between the surrounding rock and the front shield, and achieving escape through diameter reduction; after escape, the cutter disc is used to drive the support assembly to reset, so that it returns to the initial support height, and then the second airbag can be used to introduce gas of a certain pressure into the positioning slot, thereby pushing out the plug-in plate, separating the cutter disc and the support assembly, thereby ensuring normal excavation operations after escape.

[0006] In a preferred embodiment of the present invention, the front support member is a front support seat, and the plug-in plate is in sealing and sliding engagement with the first slide groove; the protective assembly further comprises a positioning shell and a movable plate, the positioning shell having a mounting groove, the first airbag and the movable plate being arranged in the mounting groove from the inside out, and an anti-slip edge is provided at the notch of the positioning shell to prevent the movable plate from escaping from the mounting groove; The protective assembly also includes a pair of wedge blocks arranged at intervals at the bottom of the positioning shell, and the two wedge blocks are respectively slidably engaged with the front support member and the rear support member. The bottom surface height of the wedge block gradually increases from one side to the other side along the circumferential direction, and the high side of the wedge block and the support high side of the front support member are arranged on the same side.

[0007] The beneficial effect is that when the front shield is subjected to extrusion force, it transmits force to the multiple movable plates on the circumferential surface, and the movable plates are squeezed to squeeze the first airbag, thereby achieving power release of the first airbag.

[0008] In a more preferred embodiment of the present invention, the first pipeline includes two first hoses corresponding one-to-one to the wedge blocks and a gas channel opened in the connecting beam, the gas channel is arranged along the axial direction of the front shield and its air outlet is connected to the first slide groove; each first hose is fixedly connected to the connecting beam, and the air outlet of the first hose extends into the gas channel; the wedge block is provided with a receiving groove for accommodating the first hose, and the receiving groove is arranged circumferentially and has a side opening.

[0009] In a more preferred embodiment of the present invention, second sliding grooves are symmetrically provided on both sides of the plug-in board, and a first sliding block that matches the first sliding groove one-to-one is provided in the first sliding groove. The first sliding block is clamped in the second sliding groove to prevent the plug-in board from falling out of the first sliding groove, thereby ensuring structural reliability.

[0010] Preferably, the outer mounting frame has a plurality of axially arranged connecting plates, each of which is provided with a limit block in the middle thereof. The limit block has a limit slot defined on its limit surface, and the positioning plugs on either side of the positioning shell are respectively inserted into their corresponding limit slots. The thickness of the positioning plugs is less than the radial depth of the limit slots, allowing the positioning shell to move radially within the mounting hole. The present invention utilizes the limit blocks to limit the position of the protective assembly, ensuring reliable installation of the protective assembly and preventing the protective assembly from falling out of the mounting hole of the front shield.

[0011] Preferably, the support shoe assembly includes a first support plate and a second support plate of an arc-shaped structure, the second airbag is located between the first support plate and the second support plate, at least two connecting rods are fixedly connected to the first support plate, each of the connecting rods passes through the second support plate, the end of the connecting rod has an anti-detachment boss to prevent the second support plate from detaching, and the connecting rod located between the first support plate and the second support plate is provided with a limiting boss for limiting the radial movement position of the second support plate. The beneficial effect is that because the anti-detachment boss and the limiting boss are at a certain distance, when the gas in the second airbag exceeds a certain amount, the second support plate exerts a reaction force on the second airbag, causing the gas in the second airbag to enter the positioning slot along the second pipeline, thereby pushing the positioning plug plate open, which helps to reset the plug plate.

[0012] Preferably, the second pipeline includes a second hose and an air supply channel opened on the front shield, the second hose is connected to the air supply channel, the air supply channel is connected to the ring pipe embedded in the main cutter disc, and the multiple branches connected to the ring pipe are respectively connected to the positioning slots one by one.

[0013] Compared with the prior art, the advantages of the present invention are: the present invention processes the front shield into a double-layer structure, and a first airbag can be built into the front shield. When the front shield is squeezed, the first airbag is forced to exhaust, and the gas in the first airbag enters the first slide groove, thereby pushing out the plug-in plate so that it is stuck in the positioning slot of the cutter disc, thereby realizing a fixed connection between the cutter disc and the front shield. The cutter disc rotates in the opposite direction (relative to the excavation rotation direction) to drive the support assembly to rotate, thereby causing multiple anti-stuck structures to retract radially at the same time, reducing the outer diameter of the front shield, thereby reducing the clamping force between the surrounding rock and the front shield, and achieving escape by reducing the diameter; the second airbag of the present invention can pass a certain pressure of gas into the positioning slot, thereby pushing out the plug-in plate, separating the cutter disc and the front shield, thereby ensuring normal excavation operations after escape. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention.

[0015] Figure 2 Schematic diagram of the anti-stuck structure of the present invention.

[0016] Figure 3 Schematic diagram of the support assembly of the present invention.

[0017] Figure 4 It is a schematic diagram of the cooperation between the support assembly and the left guide rail and the right guide rail of the present invention.

[0018] Figure 5 It is a schematic diagram of the front shield and anti-stuck structure of the present invention.

[0019] Figure 6 It is a schematic diagram of the front shield of the present invention.

[0020] Figure 7 This is an exploded view of the anti-jamming assembly and the outer mounting frame.

[0021] Figure 8 Schematic diagram of the gripper assembly.

[0022] Figure 9 This is the end view of the cutter head (the end face close to the front shield).

[0023] Figure 10 This is a schematic diagram of the interior of the cutterhead. DETAILED DESCRIPTION

[0024] The following describes an embodiment of the present invention in detail with reference to the accompanying drawings. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process. However, the protection scope of the present invention is not limited to the following embodiment.

[0025] It should be noted that, in the description of the present invention, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0026] In the description of the present invention, unless otherwise specified or limited, the terms "connected" and "connection" that may appear should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0027] like Figure 1-10 As shown, the present invention proposes an anti-stuck shield tunneling structure, comprising a cutterhead 100, a front shield 200, a telescopic shield 300 and a rear shield 400 arranged in sequence from front to back. The cutterhead 100 is flange-connected to the rotary power source in the front shield 200. During tunneling operation, the rotary power source drives the cutterhead 100 to rotate clockwise. During the clockwise rotation of the cutterhead 100, the surrounding rock is broken to achieve tunneling. The front shield 200 includes a rear shell 201 and a double-layer shield body fixedly connected to the front end of the rear shell 201. The double-layer The shield body includes an inner guard plate 202 and an outer mounting frame 203 with a gap set outside the inner guard plate 202. The rear ends of the inner guard plate 202 and the outer mounting frame 203 are both fixedly connected to the rear shell 201. The rear shell 201 provides a mounting base for the double-layer shield body, ensuring the structural reliability of the inner guard plate 202 and the outer mounting frame 203. The rear shield 400 is equipped with at least two hydraulic cylinder-driven gripper assemblies 600. The gripper assemblies 600 can facilitate excavation operations by leveraging the reaction force exerted by the hydraulic cylinders on the pipe segments. The anti-stuck shield tunneling structure of the present invention further includes a plurality of anti-stuck structures 500 spaced apart along the circumferential direction of the front shield 200. The plurality of anti-stuck structures 500 have the same structure and all include a support assembly and a protective assembly that slides with the support assembly. The outer mounting frame 203 is provided with a plurality of mounting holes spaced apart, and a group of protective assemblies is installed in each mounting hole. The support assembly is located in the gap between the inner guard plate 202 and the outer mounting frame 203 at the corresponding position of the mounting hole. The support assembly includes a front support member (i.e., a front support seat 501a) and a rear support member (i.e., a rear support seat 501b). The front support seat 501a and the rear support seat 501b are connected together by a connecting beam 501f. A front guide rail 501c and a rear guide rail 501d in a circular ring structure are provided between the inner guard plate 202 and the outer mounting frame 203. The front support seat 501a slides with the front guide rail 501c, and the rear support seat 501b slides with the rear guide rail 501d. The protective component has a wedge block 502a that matches the front support seat 501a and the rear support seat 501b one by one, and the bottom surface height of the wedge block 502a gradually increases from one side to the other side along the circumferential direction (that is, one side of the wedge block 502a is thicker and the other side is thinner); the support height of the front support seat 501a and the rear support seat 501b gradually decreases from the first side to the second side along the circumferential direction (the thickness of the front support seat 501a and the rear support seat 501b gradually decreases from the first side to the second side), the thick end of the wedge block 502a is opposite to the thin end of the front support seat 501a / rear support seat 501b, and the thin end of the wedge block 502a is opposite to the thick end of the front support seat 501a / rear support seat 501b. When the support assembly is rotated counterclockwise under force, its thin end slides toward the thin end of the wedge block 502a, thereby changing the support height, causing the protective assembly to retract radially to facilitate escape; when the support assembly is rotated clockwise by a specified angle, the support height becomes higher, thereby causing the protective assembly to expand radially outward, which is conducive to the resetting of the protective assembly.

[0028] The front end portion of each front support seat 501a is sealed with a plug-in plate 501e of a telescopic structure, and a positioning slot 101a that matches the plug-in plate 501e is provided on the rear side of the cutter disc 100. When the plug-in plate 501e is inserted into the positioning slot 101a, the cutter disc 100 and the support assembly are locked. When the plug-in plate 501e is removed from the positioning slot 101a, the plug-in plate 501e and the cutter disc 100 are unlocked. The front end portion of the front support seat 501a is provided with a first sliding groove, and the plug-in plate 501e is sealed and slidably matched with the first sliding groove. The first airbag 502b of the protective component is connected to the first slide groove through the first pipeline. When the first airbag 502b passes gas to the first slide groove through the first pipeline, the plug-in plate 501e is pushed out so that it is clamped in the positioning slot 101a of the cutter disc 100, thereby realizing a locking connection between the cutter disc 100 and the support component; the second airbag 606 of the support shoe assembly 600 is connected to the positioning slot 101a through the second pipeline. When the second airbag 606 passes gas to the positioning slot 101a through the second pipeline, the plug-in plate 501e is pushed out, thereby realizing unlocking the plug-in plate 501e and the cutter disc 100.

[0029] The present invention processes the front shield 200 into a double-layer structure. When the first airbag 502b is installed on the double-layer shield body of the front shield 200, when the front shield 200 is squeezed, the first airbag 502b is forced to exhaust. The gas in the first airbag 502b enters the first chute, thereby pushing out the plug-in plate 501e so that it is stuck in the positioning slot 101a of the cutterhead 100, thereby achieving a fixed connection between the cutterhead 100 and the front shield 200. The cutterhead 100 rotates in the opposite direction (relative to the direction of excavation rotation) to drive the support assembly to rotate, thereby causing the multiple anti-sticking structures 500 to simultaneously retract radially inward, reducing the outer support diameter of the front shield 200, thereby reducing the clamping force between the surrounding rock and the front shield 200, and achieving escape through diameter reduction; after escape, the second airbag 606 can pass gas at a certain pressure into the positioning slot 101a, thereby pushing out the plug-in plate 501e, separating the cutterhead 100 and the front shield 200, thereby ensuring normal excavation operation after escape.

[0030] Combine Figure 2 As can be seen, the protective assembly also includes a positioning shell 502c and a movable plate 502d. The positioning shell 502c has a mounting groove, and the first airbag 502b and the movable plate 502d are arranged in the mounting groove from the inside out. The notch of the positioning shell 502c is provided with an anti-slip edge to prevent the movable plate 502d from escaping the mounting groove, thereby preventing the movable plate 502d from escaping the positioning shell 502c. On the one hand, the movable plate 502d can protect the first airbag 502b. On the other hand, when squeezed by the surrounding rock, the movable plate 502d is subjected to force and transmits it to the first airbag 502b. The first airbag 502b is compressed and releases gas, causing the plug-in plate 501e to pop out, which is conducive to the locking connection between the cutter head 100 and the support assembly. Two wedge blocks 502a are fixed to the bottom of the positioning shell 502c. The wedge blocks 502a and the support seat slide together, thereby realizing a sliding connection between the support assembly and the protective assembly, ensuring relative sliding between the two.

[0031] In actual installation, combined with Figure 2-3 As can be seen, the first pipeline includes two first hoses 502f corresponding one-to-one with the wedge blocks 502a, and a gas channel 502g defined within the connecting beam 501f. The gas channel 502g is arranged axially along the front shield 200, and its outlet communicates with the first chute. The connection between the first hoses 502f and the connecting beam 501f is sealed, with the outlet of one hose extending into the gas channel 502g to prevent air leakage. The first chute is slidably and sealedly connected to the plug-in plate 501e to prevent air leakage. When the plug-in plate 501e is reset, it pushes the gas in the first chute back into the first airbag 502b.

[0032] Of course, in actual operation, the first slide groove and the plug-in plate 501e can also be non-sealed connections, and an inflation tube can be connected to the first airbag 502b to replenish gas into the first airbag 502b. When a jam occurs again, it can be ensured that the gas in the first airbag 502b can push the plug-in plate 501e out.

[0033] Combine Figure 2 It can be seen that each wedge block 502a has a side-opening receiving groove 502h. When the support base rotates, the first hose 502f is located in the receiving groove 502h to protect the first hose 502f.

[0034] Combine Figure 3 It can be seen that each plug-in board 501e is symmetrically provided with a second slide groove 501i on both sides, and a first slider that matches the first slide groove one-to-one is provided in the first slide groove. The first slider is clamped in the second slide groove 501i to prevent the plug-in board 501e from falling out of the first slide groove.

[0035] Combine Figure 5-6 As can be seen, the outer mounting frame 203 has multiple axially arranged connecting plates 203a, evenly spaced along the circumference. A protective assembly is installed between every two connecting plates 203a. To ensure the secure installation of the protective assembly, a stopper 203b is provided in the middle of each connecting plate 203a. The inner surface of the stopper 203b is connected to the inner guard plate 202, ensuring the structural strength of the double-layer shield. The side surfaces of the stopper 203b are stopper surfaces, each of which has a stopper slot 203c. Positioning plugs on both sides of the positioning shell 502c are respectively inserted into their corresponding stopper slots 203c. The thickness of the positioning plugs is less than the radial depth of the stopper slots 203c, ensuring the inward and outward expansion of the protective assembly. The present invention utilizes the stopper 203b to limit the position of the protective assembly, ensuring secure installation and preventing the protective assembly from dislodging from the mounting hole of the front shield 200.

[0036] Combine Figure 8As can be seen, the gripper assembly 600 includes an arc-shaped first support plate 601 and a second support plate 602. A second airbag 606 is located between the first support plate 601 and the second support plate 602. At least two connecting rods 603 (two shown in the figure, but four, six, etc. are also possible) are fixedly connected to the first support plate 601. Each connecting rod 603 extends through the second support plate 602. The ends of the connecting rods 603 have anti-detachment bosses 604 to prevent the second support plate 602 from detaching. The connecting rods 603 located between the first support plate 601 and the second support plate 602 are provided with stopper bosses 605 to limit the radial movement of the second support plate 602. Once the front shield 200 is freed, the gripper assembly 600 can be used to reset the plug plate 501e. Specifically: Since the anti-slip boss 604 and the limiting boss 605 are at a certain distance, when the gas in the second airbag 606 exceeds a certain amount, the second support plate 602 exerts a reaction force on the second airbag 606, causing the gas in the second airbag 606 to enter the positioning slot 101a along the second pipeline, and then push the positioning plug plate open, which helps to reset the plug plate 501e.

[0037] Combine Figure 8-10 As can be seen, the second pipeline includes a second hose 607 and an air supply channel provided on the front shield 200. The second hose 607 is connected to the air supply channel, which is then connected to an annular tube 608 embedded in the main cutting disc 100. Multiple branch tubes 609 connected to the annular tube 608 are connected to the positioning slots 101a one by one. The gas in the second airbag 606 passes through the second hose 607, the air supply channel, the annular tube 608, and the branch tubes 609 and enters the positioning slot 101a. The pressurized gas pushes out the plug plate 501e, unlocking the cutting disc 100 and the front shield 200.

[0038] In actual use, a pressure sensor can be installed in each first airbag 502b and each second airbag 606, an electrically controlled valve can be installed on the first hose 502f and the second hose 607, and a CCD camera can be installed in the front shield 200. The signal output of the pressure sensor and the image output of the CCD camera are both connected to the shield machine's control system, and the control input of the electrically controlled valve is connected to the control system. When the pressure in the first airbag 502b and the second airbag 606 exceeds a set value, the electrically controlled valve opens, releasing gas from the first airbag 502b and the second airbag 606. When the pressure in the first airbag 502b exceeds the set value, inflation stops. The CCD camera can obtain position information of the cutterhead 100. If a jam occurs, the control system can control the cutterhead 100 to rotate via a rotary power source so that its positioning slot 101a aligns with the plug-in board 501e, ensuring a locked connection between the cutterhead 100 and the support assembly.

[0039] The working process and principle of the present invention are briefly described as follows: During normal excavation operations, the cutterhead 100 rotates clockwise, crushing the surrounding rock during rotation, and the crushed rock is sent out through the conveying system. When the pressure in the first airbag 502b exceeds a set first threshold, the control system determines that the surrounding rock is squeezing the front shield 200; to prevent the front shield 200 from being stuck by the surrounding rock, the control system sends a command to the electric control valve connected to the first airbag 502b, and the electric control valve opens to allow the gas in the first airbag 502b to enter the first chute. The control system obtains the position of the cutterhead 100 and controls the rotation power source to When the cutter head 100 rotates to the corresponding position of the positioning slot 101a and the plug plate 501e, the gas released by the first airbag 502b has a certain pressure, which in turn pushes the plug plate 501e open, allowing it to be inserted into the positioning slot 101a, thus achieving a locked connection between the cutter head 100 and the support assembly. The control system controls the cutter head 100 to rotate counterclockwise, causing the multiple support assemblies in the front shield 200 to rotate counterclockwise at the same time. During this process, the support height of the support assembly decreases, thereby causing the protective assembly to retract radially inward, and the support diameter of the front shield 200 to decrease, which helps the front shield 200 to escape. After the front shield 200 is freed, the control system uses the rotary power source to drive the cutterhead 100 and support assembly clockwise to a certain angle, resetting the support assembly. The support assembly increases in height, thereby causing the protective assembly to expand radially outward. After the support assembly is reset, gas is injected into the second airbag 606. When the pressure in the second airbag 606 reaches a certain level, the gas is released through the second pipeline, thereby flushing the plug-in board 501e from the positioning slot 101a, thereby resetting the plug-in board 501e. After the plug-in board 501e is reset, the second airbag 606 continues to release gas, allowing excess gas to enter the external environment through the positioning slot 101a.

[0040] Finally, it should be emphasized that the above description is merely 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 aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments without inventive effort, or replace some of the technical features therein with equivalents. Therefore, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An anti-stuck shield tunneling structure, comprising a cutterhead, a front shield, a telescopic shield and a rear shield arranged in sequence from front to back, wherein the cutterhead is flange-connected to a rotating power source in the front shield, the front shield comprises a rear shell and a double-layer shield body fixedly connected to the front end of the rear shell; the rear shield is provided with at least two hydraulic cylinder-driven gripper shoe assemblies; characterized in that: The anti-stuck shield tunneling structure also includes a plurality of anti-stuck structures spaced apart along the circumferential direction of the front shield, each of the anti-stuck structures includes a support assembly and a protection assembly slidably matched with the support assembly, the double-layer shield body includes an inner guard plate and an outer mounting frame with gaps disposed on the inner guard plate, the outer mounting frame has a plurality of mounting holes, and a group of protection assemblies is installed in each of the mounting holes; The support assembly comprises a front support member and a rear support member, the front support member and the rear support member are connected together by a connecting beam, the support heights of the front support member and the rear support member gradually decrease from one side to the other side along the circumferential direction, the two ends of the protection assembly are respectively slidably matched with the front support member and the rear support member, and the sliding surface of the protection assembly gradually increases from one side to the other side along the circumferential direction; A front guide rail and a rear guide rail in a circular ring structure are provided between the inner guard plate and the outer mounting frame, the front support member is slidably matched with the front guide rail and its front end portion is located in the front gap surrounded by the outer mounting frame and the inner guard plate, and the rear support member is slidably matched with the rear guide rail; a plug-in plate of a telescopic structure is provided at the front end portion of each front support member, and a positioning slot that is matched with the plug-in plate one by one is provided on the rear side surface of the cutter disc; A first slide groove is provided at the front end portion of the front support member, and the plug-in plate is sealingly and slidingly matched with the first slide groove; the first airbag of the protective component is connected with the first slide groove through a first pipeline, and when the first airbag passes gas into the first slide groove through the first pipeline, the plug-in plate is pushed out so that it is clamped in the positioning slot of the cutter disc; the second airbag of the support shoe assembly is connected with the positioning slot through a second pipeline, and when the second airbag passes gas into the positioning slot through the second pipeline, the plug-in plate is pushed out so that it is reset to the first slide groove.

2. The anti-stuck shield tunneling structure according to claim 1, characterized in that: The front support member is a front support seat, and the plug-in plate is in sealing and sliding cooperation with the first slide groove; the protection assembly also includes a positioning shell and a movable plate, the positioning shell has a mounting groove, the first airbag and the movable plate are arranged in the mounting groove from the inside to the outside, and the notch of the positioning shell is provided with an anti-slip edge to prevent the movable plate from escaping from the mounting groove; The protection component also includes a pair of wedge blocks arranged at intervals at the bottom of the positioning shell, and the two wedge blocks are slidably matched with the front support member and the rear support member respectively. The bottom surface height of the wedge block gradually increases from one side to the other side along the circumferential direction, and the high side of the wedge block is arranged on the same side as the support high side of the front support member.

3. The anti-stuck shield tunneling structure according to claim 2, characterized in that: The first pipeline includes two first hoses corresponding to the wedge blocks one by one and a gas channel opened in the connecting beam, the gas channel is arranged along the axial direction of the front shield and its air outlet is connected to the first slide groove; each of the first hoses is fixedly connected to the connecting beam, and the air outlet of the first hose extends into the gas channel; the wedge block is provided with a receiving groove for receiving the first hose, and the receiving groove is arranged circumferentially and has a side opening.

4. The anti-stuck shield tunneling structure according to claim 2, characterized in that: Second sliding grooves are symmetrically provided on both sides of the plug board, and first sliding blocks that match the first sliding grooves one by one are arranged in the first sliding grooves.

5. The anti-stuck shield tunneling structure according to claim 1, characterized in that: The outer mounting frame has a plurality of axially arranged connecting plates, a limiting block is arranged in the middle of each connecting plate, a limiting groove is provided on the limiting surface of the limiting block, the positioning plugs on both sides of the positioning shell are respectively inserted into the corresponding limiting grooves, the thickness of the positioning plugs is less than the radial depth of the limiting groove, so that the positioning shell moves radially in the mounting hole.

6. The anti-stuck shield tunneling structure according to claim 1, characterized in that: The support shoe assembly includes a first support plate and a second support plate of an arc-shaped structure, the second airbag is located between the first support plate and the second support plate, at least two connecting rods are fixedly connected to the first support plate, each of the connecting rods passes through the second support plate, and the end of the connecting rod has an anti-detachment boss to prevent the second support plate from detaching, and a limiting boss for limiting the radial movement position of the second support plate is provided on the connecting rod located between the first support plate and the second support plate.

7. The anti-stuck shield tunneling structure according to claim 2, characterized in that: The second pipeline includes a second hose and an air supply channel opened on the front shield, the second hose is connected to the air supply channel, the air supply channel is connected to an annular tube embedded in the main blade, and multiple branch pipes connected to the annular tube are respectively connected to the positioning slots one by one.

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