A shield tunneling machine

Abstract

A shield machine relates to the technical field of drilling in soil layers or rocks. It includes a tower-shaped frame, a conveyor belt driving device, a cutter head driving device, a tile assembling machine, a shield device, and a slag discharging device; a conveyor belt is arranged on the outer edge of the tunneling end of the tower-shaped frame, and the conveyor belt is driven by the conveyor belt driving device to run around the outer edge of the tower-shaped frame; a cutter head is arranged at the end of the tunneling end of the tower-shaped frame and on the conveyor belt, and the cutter head is driven by the cutter head driving device to rotate. In the present invention, a tower-shaped frame is built according to the cross-sectional shape of the construction, and the tower-shaped frame determines the running track of the conveyor belt, so as to be able to meet the shield tunneling construction of double-track railway tunnels, double-track subway tunnels, multi-lane highway tunnels, and underground hangar tunnels with a flattened circular, oval, semi-elliptical, or quasi-rectangular cross-section.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling in soil layers or rocks, and particularly to a shield machine. Background Art

[0002] A shield machine is a tunneling machine used in shield tunneling construction. Shield tunneling construction is that the tunneling machine lays the support segments of the tunnel while tunneling. This machine has the characteristic of completing the tunnel excavation at one time, and the excavation, propulsion, and support are all completed by this machine.

[0003] Although the technology of using shield machines for tunnel boring construction equipment has been mature, there are still many limitations:

[0004] First, existing shield machines are mostly limited to circular, horseshoe-shaped, and quasi-rectangular shapes. If tunnels with other special-shaped cross-sections need to be satisfied, such as when the tunnel cross-section is oblate, elliptical, or semi-elliptical, it is very difficult to achieve with existing technologies. If a very large span needs to be satisfied at the same time, it is even more difficult with existing technologies.

[0005] Second, the manufacturing, transportation, installation, and demolition of super-large diameter shield machines have large workloads, high difficulties, and long time-consuming. Due to their huge volume and heavy self-weight, super-large diameter shield machines have high requirements for transportation or hoisting equipment, and also have high requirements for the passing capacity of roads and bridges during transportation. Super-large diameter shield machines also have high requirements for the working sites for installation and demolition.

[0006] Third, the tunnel cross-section excavated by shield machines during tunneling construction is mostly circular, and the tunnel cross-section cannot be excavated according to the required shape, such as double-track railway tunnels, double-track subway tunnels, multi-lane highway tunnels, and underground hangar tunnels where the tunnel width is greater than the tunnel height. Therefore, when using a circular shield machine for construction, a large amount of rock and soil that originally did not need to be excavated at the lower part of the tunnel is excavated, increasing the excavation workload, increasing the consumption of tile or arch materials, increasing a large amount of backfill materials at the lower part of the tunnel, and consuming a large amount of funds. The larger the diameter of the tunnel cross-section, the greater the amount of rock and soil that originally did not need to be excavated, and the more time, materials, and funds are consumed. Summary of the Invention

[0007] The present invention discloses a shield machine that can meet the tunneling and construction requirements for special-shaped cross-sections such as oblate, elliptical, and semi-elliptical cross-sections or special terrains;

[0008] The present invention is achieved through the following technical solutions:

[0009] A shield machine, comprising a tower-shaped frame, a conveyor belt drive device, a cutter head drive device, a tile assembler, a shield device and a muck discharging device; a conveyor belt is arranged on the outer edge of the tunneling end of the tower-shaped frame, and the conveyor belt is driven by the conveyor belt drive device to run around the outer edge of the tower-shaped frame; a cutter head is arranged at the end of the tunneling end of the tower-shaped frame and on the conveyor belt, and the cutter head is driven to rotate by the cutter head drive device.

[0010] The conveyor belt drive device includes more than one pair of power support wheels; the conveyor belt is driven to run by the power support wheels.

[0011] The cutter head drive device includes a power supply sliding contact wire and a power supply sliding contact wire groove, the power supply sliding contact wire groove is fixedly connected to the tower-shaped frame under the conveyor belt, and the power supply sliding contact wire is arranged in the power supply sliding contact wire groove; one end of the power supply sliding contact wire is connected to the tail of the cutter head shaft to provide power for the rotation of the cutter head.

[0012] The tower-shaped frame is a detachable tower-shaped frame.

[0013] It includes a device for preventing the conveyor belt from sagging. The device for preventing the conveyor belt from sagging includes a suspension walking wheel groove fixedly connected to the tower-shaped frame and suspension walking wheels installed on both sides of the conveyor belt. The suspension walking wheels are carried by the conveyor belt to run in the suspension walking wheel groove.

[0014] The tunneling end of the tower-shaped frame is arranged in a "convex"-shaped step, and a conveyor belt is arranged on the outer edge of each "convex"-shaped frame body.

[0015] The running directions of any two adjacent conveyor belts are opposite to each other.

[0016] The cutter head arranged at the end of the tunneling end of the tower-shaped frame is driven by a reciprocating device to make a reciprocating motion.

[0017] The cutter heads on different conveyor belts have the same or different sizes.

[0018] A rolling wheel groove is arranged on the rear shaft side of the cutter head arranged at the end of the tunneling end of the tower-shaped frame, and a rolling wheel is arranged in the rolling wheel groove.

[0019] The beneficial effects of the present invention:

[0020] 1. The shield machine involved in the present invention includes a tower-shaped frame. A conveyor belt is arranged on the upper part of the outer edge of the tower-shaped frame. The conveyor belt is driven by a conveyor belt driving device to run around the outer edge of the tower-shaped frame. A cutter head is arranged on the conveyor belt. The cutter head is driven by the cutter head driving device to rotate on the conveyor belt. The tower-shaped frame is built according to the cross-sectional shape of the construction, and the tower-shaped frame determines the running track of the conveyor belt, so as to be able to meet the shield tunneling construction of double-track railway tunnels, double-track subway tunnels, multi-lane highway tunnels, and underground hangar tunnels with a flattened circular, elliptical, semi-elliptical, or quasi-rectangular cross-section. And the span of the tunnel can be more than 3 meters. This makes the design of the tunnel cross-section more in line with actual needs and more economical and safe.

[0021] 2. The shield machine involved in the present invention is suitable for tunneling tunnels in clay, sandstone, soft rock, and hard rock.

[0022] 3. The shield machine involved in the present invention can be manufactured into relatively small parts or assemblies for on-site installation. The tower-shaped frame is selected in a bolt-connected and detachable form. This completely changes the current situation where large shield equipment has a huge overall volume and heavy mass, resulting in large workload, high difficulty, long time consumption, and high cost in manufacturing, transportation, installation, and demolition. At the same time, it also greatly changes the current situation that the installation and demolition of large shield equipment have particularly high requirements for the working site. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is the front structural schematic diagram of the present invention;

[0024] Figure 2 is Figure 1 the schematic diagram of the A-A cross-section in

[0025] Figure 3 is Figure 1 the schematic diagram of the B-B cross-section in

[0026] Figure 4 is Figure 3 the enlarged schematic diagram of A1 in

[0027] Figure 5 is Figure 3 the enlarged schematic diagram of A2 in

[0028] Figure 6 is Figure 3 the enlarged schematic diagram of B1 in

[0029] Figure 7 is Figure 3 the enlarged schematic diagram of B2 in

[0030] Figure 8 is Figure 3 the enlarged schematic diagram of C in

[0031] Figure 9 isFigure 4 , Figure 6 Schematic enlarged view of a1 in

[0032] Figure 10 is Figure 5 , Figure 7 Schematic enlarged view of a2 in

[0033] Figure 11 is Figure 4 , Figure 6 Schematic enlarged view of b1 in

[0034] Figure 12 is Figure 5 , Figure 7 Schematic enlarged view of b2 in

[0035] Figure 13 Schematic diagram of the slag discharging device

[0036] Figure 14 Schematic diagram of the tile installation device

[0037] In the figure: 1-1: The first cutter head, 1-2: The second cutter head, 1-3: The third cutter head, 2-1: The first conveyor belt, 2-2: The second conveyor belt, 3: The tower-shaped frame, 3-1: The outermost first level of the tower-shaped frame, 3-2: The second outermost level of the multi-level tower-shaped frame, 3-3: The end of the tower-shaped frame, 4-1: The power support wheel, 4-2: The non-power support wheel, 5-1: The hanging walking wheel, 5-2: The rail groove of the hanging walking wheel, 6-1: The trolley wire rail groove, 6-2: The trolley wire, 7: The reciprocating running device, 8-1: The rolling wheel, 8-2: The rolling wheel groove, 9-1: The middle tile assembler, 9-2: The manipulator, 10-1: The side tile assemblers, 10-2: The first manipulator, 11: The shield plate, 12: The telescopic support, 13-1: The rolling wheel, 13-2: The rolling wheel groove B, 14: The precast tile, 15: The slag discharging cylinder Detailed implementation mode

[0038] The present invention will be described in detail and completely below with reference to the accompanying drawings

[0039] As Figures 1 to 14 shown, a special-shaped cross-section shield machine includes: a cutter head, a conveyor belt, a multi-level tower-shaped frame, a support wheel, a hanging walking wheel groove, a power trolley wire, a reciprocating device, a lateral non-offset device, a tile assembler and its manipulator, a shield device, a control conveyor belt lateral non-offset device, and a slag discharging device

[0040] A shield machine, comprising a tower-shaped frame, a conveyor belt driving device, a cutter head driving device, a tile assembling machine, a shield device and a slag discharging device; a conveyor belt is arranged on the outer edge of the tunneling end of the tower-shaped frame, and the conveyor belt is driven by the conveyor belt driving device to run around the outer edge of the tower-shaped frame; a cutter head is arranged at the end of the tunneling end of the tower-shaped frame and on the conveyor belt, and the cutter head is driven by the cutter head driving device to rotate; the cutter head at the end of the tunneling end of the tower-shaped frame rotates during the advancement of the tower-shaped frame to achieve the purpose of tunneling, and the structure or shape of the tunneling end of the tower-shaped frame determines the running track of the conveyor belt and thus determines the shape of the tunneling face.

[0041] The conveyor belt driving device includes more than one pair of power support wheels, and the power support wheels drive the conveyor belt to run; the conveyor belt is supported by non-power support wheels to ensure the smooth running of the conveyor belt and prevent the conveyor belt from deflecting downward during operation.

[0042] The cutter head driving device includes a power supply trolley wire and a power supply trolley wire groove, the power supply trolley wire groove is fixedly connected to the tower-shaped frame below the conveyor belt, and the power supply trolley wire is arranged in the power supply trolley wire groove; one end of the power supply trolley wire is connected to the tail of the cutter head shaft to provide power supply for the rotation of the cutter head, and the power supply trolley wire groove provides support for the power supply trolley wire and has the functions of waterproofing, moisture-proofing and protecting the power supply trolley wire.

[0043] The tower-shaped frame is a detachable tower-shaped frame, which is convenient for assembly, disassembly and transportation; the transportation cost is reduced.

[0044] It includes a device for preventing the conveyor belt from deflecting downward. The device for preventing the conveyor belt from deflecting downward includes a suspension walking wheel groove fixedly connected to the tower-shaped frame and suspension walking wheels installed on both sides of the conveyor belt. The suspension walking wheels are carried by the conveyor belt to run in the suspension walking wheel groove. When the shield machine is tunneling, the conveyor belt runs around the outer edge of the tower-shaped frame. The conveyor belt at the top of the outer edge of the tower-shaped frame is supported by non-power support wheels, and the conveyor belt at the bottom of the outer edge of the tower-shaped frame is supported by suspension walking wheels.

[0045] The tunneling end of the tower-shaped frame is arranged in a "convex"-shaped step. A conveyor belt is arranged on the outer edge of each "convex"-shaped frame body. First, the purpose of step tunneling is achieved to ensure safety. Second, it is prevented that the cutter heads running and rotating during tunneling collide with each other, causing equipment damage.

[0046] The running directions of any two adjacent conveyor belts are opposite to each other, preventing the generation of concentrated torsion during tunneling and damaging the equipment.

[0047] The cutter head arranged at the end of the tunneling end of the tower-shaped frame is driven by a reciprocating device to make a reciprocating motion, preventing the generation of dead angles during tunneling.

[0048] The cutterheads on different conveyor belts may be the same or different in size, and a specific cutterhead layout may be selected according to the specific geology of the excavation.

[0049] A rolling wheel groove is provided on the rear axis side of the cutter head arranged at the excavation end of the tower frame, and a rolling wheel is provided in the rolling wheel groove to prevent the horizontal reverse force generated by the axial rock and soil resistance of the tunnel from causing the cutter head axis to deviate backward during the excavation process.

[0050] The cutter disc refers to the first cutter disc 1-1, the second cutter disc 1-2 and the third cutter disc 1-3, and each cutter disc shaft is equipped with an independent power to drive the cutter disc to rotate. The diameter size and distribution number of the first cutter disc 1-1, the second cutter disc 1-2 and the third cutter disc 1-3 are selected and formulated according to the height and width of the tunnel section design. The diameter size of the first cutter disc 1-1, the second cutter disc 1-2 and the third cutter disc 1-3 can be the same or different, mainly depending on the geological conditions of the construction tunnel. If the geology of the construction tunnel contains a large amount of groundwater, the diameter of the first cutter disc 1-1 is preferably large to prevent groundwater from splashing into the power busbar track groove 6-1 at the multi-stage tower frame 3-1 that provides power for the rotating first cutter disc 1-1; if the underground rock and soil hardness is high, the diameter size of the first cutter disc 1-1, the second cutter disc 1-2 and the third 1-3 should not be too large, but the rotation speed of the cutter disc can be increased or the number of cutter discs can be increased to ensure the cutting progress. At the same time, a conveyor belt and a set of cutter discs are added to make up for the small size of the cutter discs that cannot cover the tunnel section. The diameter and number of the cutter discs are a comprehensive indicator, which can be evaluated in advance based on geotechnical data to develop the best solution. The speed of the cutter disc or the travel speed of the conveyor belt can be adjusted during excavation.

[0051] The No. 1 conveyor belt 2-1 and the No. 2 conveyor belt 2-2 are respectively equipped with a plurality of first cutter discs 1-1 and a plurality of second cutter discs 1-2, and run around the outer edge of the outer first level 3-1 or the second outer first level 3-2 except the end 3-3 of the multi-level tower frame. The running directions of two or more conveyor belts are opposite to each other, so as to offset or reduce the concentrated torque generated by the conveyor belts on the tower frame 3 during operation, and reduce the risk of deviation during shield tunneling.

[0052] The tower frame is constructed by calculating the specific size of the stepped boss of the tower frame according to the established cutter head diameter or the width of the conveyor belt. The tower frame is preferably detachable to facilitate transportation, installation and removal.

[0053] The conveyor belt is supported by a power support wheel 4-1 and a non-power support wheel 4-2. The conveyor belt driving device consists of multiple power support wheels 4-1. The power support wheels 4-1 rotate under the drive of a motor or other power device to drive the conveyor belt to carry the cutter head and run along the outer edge of the stepped boss of the tower-shaped frame. The distance or number between the power support wheel 4-1 and the non-power support wheel 4-2 should be such that the conveyor belt carrying the cutter head runs smoothly and supports the conveyor belt without obvious downward deflection at the upper part. The support wheels have an adjustable lifting function.

[0054] The suspension walking wheel groove is composed of a suspension walking wheel 5-1 and a suspension walking wheel rail groove 5-2. When the conveyor belt carrying the cutter head runs to the bottom position of the outer edge of the tunneling end, due to the self-weight of the conveyor belt and the cutter head, the conveyor belt deflects downward, affecting the normal operation of the conveyor belt carrying the cutter head. To avoid the downward deflection of the conveyor belt, the suspension walking wheel rail grooves 5-2 are respectively fixed at the outer first level 3-1 or the second outer level 3-2 of the multi-level tower-shaped frame of the tower-shaped frame. The suspension walking wheels 5-1 are respectively fixed on both sides of the first conveyor belt 2-1 and the second conveyor belt 2-2. The suspension walking wheels 5-1 are carried by the conveyor belt to walk in the suspension walking wheel rail grooves 5-2, controlling the conveyor belt not to deflect downward and operate normally. The number or spacing of the suspension walking wheels should be such that the conveyor belt carrying the cutter head runs smoothly and does not have obvious downward deflection at the lower part.

[0055] A power supply sliding contact wire groove 6-1 is laid on the tower-shaped frame of the running track of the conveyor belt carrying the cutter head, and a power supply sliding contact wire 6-2 is arranged at the tail of the cutter head shaft carried on the conveyor belt. The power supply sliding contact wire 6-2 is carried by the conveyor belt to run in the power supply sliding contact wire groove 6-1, providing a driving rotation power supply for the cutter head carried on the conveyor belt. The environment of tunnel construction is complex, with a lot of moisture and water. Therefore, the moisture-proof and waterproof of the power supply sliding contact wire groove are particularly important.

[0056] The reciprocating device 7 is arranged at the end 3-3 of the tower-shaped frame and is a device for driving the third cutter head 1-3 to perform reciprocating operation. The third cutter head 1-3 performs transverse reciprocating operation while rotating to cut the rock and soil, so as to cut the parts that cannot be touched by the circular cutter head between the third cutter heads 1-3 at the end of the frame. The reciprocating stroke length must meet the requirement that there is no cutting blind area left during the reciprocating operation of the third cutter head 1-3 at the end. Specifically, the reciprocating device 7 includes a connecting rod provided with a plurality of shaft holes. The rotating shafts of the third cutter heads 1-3 pass through the shaft holes of the connecting rod. The connecting rod makes reciprocating motion at the end of the tower-shaped frame under the drive of the electric cylinder without affecting the rotation of the third cutter head 1-3.

[0057] The lateral non-offset device is composed of a rolling wheel 8-1 installed on the rear shaft side of the third cutter head at the end and a rolling wheel groove 8-2 fixed on the tower-shaped frame 3. When the third cutter head 1-3 makes a reciprocating motion to cut the rock and soil, the horizontal reverse force generated by the rock and soil resistance is transmitted to the rolling wheel 8-1, and the rolling wheel groove 8-2 controls the operation of the rolling wheel 8-1 in the rail groove, enabling the third cutter head at the end to rotate and work properly.

[0058] The tile assembling machine and its manipulator refer to that the middle tile assembling machine 9-1 and its manipulator 9-2 are responsible for assembling the tiles 14 in the middle lower and upper parts of the tunnel; the two side assembling machines 10-1 and their second manipulators 10-2 are responsible for assembling the tiles 14 on both sides. When the tunneling face meets the conditions for tile assembly, first, the manipulator 9-2 of the middle tile assembling machine 9-1 picks up the tile 14 and assembles it symmetrically from the middle of the tunnel bottom to both sides. At the same time, the assembled tiles are corrected and fixed before the next tile can be assembled. Then, the first manipulators 10-2 of the two side tile assembling machines 10-1 pick up the tiles 14 and assemble them symmetrically from both sides. Finally, the manipulator 9-2 of the middle tile assembling machine 9-1 picks up the tile 14 and installs the upper middle tile.

[0059] The shield device is composed of a shield plate 11 and a telescopic support 12. According to the shape of the outer edge contour line of the tunnel section, the shield plate is made into many arc-shaped shield plates 11. The adjacent two shield plates are overlapped by means of a bolt-pressed opening plate. One end of the shield plate is fixed on the outer edge of the tower-shaped frame 3, and the other end extends to the rear position of the first cutter head 1-1, preferably without touching the running first cutter head 1-1. One or more telescopic supports 12 provide stable support for the shield plates in a circle, ensuring the safe and stable operation of the shield plates. After the shield plate 11 is installed and debugged, the overlapping part of the shield plate is firmly connected by means of a bolt-pressed opening plate to enhance the integrity of the shield plate 11. By adjusting the support force of the telescopic support 12 on the shield plates 11 at different positions in a circle, it plays a role in auxiliary deviation correction and steering of the equipment and solving the problem of shield plate jamming.

[0060] The control device for the lateral non-offset of the conveyor belt is composed of a rolling wheel 13-1 installed at one end of the conveyor belt and a rolling wheel groove B 13-2 fixed on the tower-shaped frame 3. When the first conveyor belt 2-1 carries the first cutter head 1-1 to cut the rock and soil, the horizontal reverse force generated by the rock and soil resistance is transmitted to the rolling wheel 13-1 through the first cutter head 1-1 and the first conveyor belt 2-1. The rolling wheel groove B 13-2 controls the operation of the rolling wheel 13-1 in the rail groove, achieving the purpose of controlling the lateral non-offset of the first conveyor belt 2-1 carrying the cutting cutter head 1-1 during the process of cutting the rock and soil. The same principle applies to the second conveyor belt 2-2 carrying the second cutter head 1-2 to cut the rock and soil.

[0061] The working principle of the present invention is as follows: One or more first cutter heads 1-1 are carried by the first conveyor belt 2-1 and run around the outer edge of the first stage 3-1 of the multi-stage tower-shaped frame. As the first conveyor belt 2-1 runs, one or more rotating first cutter heads cut and excavate the rock and soil of the excavation section. One or more adjustable lifting power support wheels 4-1 provide the driving force for the running of the first conveyor belt 2-1. When the first conveyor belt 2-1 carrying the first cutter head 1-1 runs around the outer edge of the first stage 3-1 of the multi-stage tower-shaped frame, due to self-gravity, the first conveyor belt 2-1 deflects downward at the top of the outer edge of the excavation end. One or more adjustable lifting power support wheels 4-1 and one or more adjustable lifting non-power support wheels 4-2 support the smooth running of the first conveyor belt 2-1. The number or spacing of the power support wheels 4-1 and the non-power support wheels 4-2 should be such that the conveyor belt runs smoothly without deflection; to prevent the first conveyor belt 2-1 carrying the first cutter head 1-1 from deflecting downward at the bottom when running around the outer edge of the first stage 3-1 of the multi-stage tower-shaped frame, it is jointly completed by the suspension running wheels 5-1 installed at both ends of the first conveyor belt 2-1 to prevent the conveyor belt from deflecting downward and the suspension running wheel rail grooves 5-2 installed at the multi-stage tower-shaped frame 3-1 to prevent the conveyor belt from deflecting downward. The suspension running wheels 5-1 run in the suspension running wheel rail grooves 5-2, restricting the downward deflection of the first conveyor belt 2-1. The number or spacing of the suspension running wheels should be such that the first conveyor belt 2-1 runs smoothly without deflection; the power supply for the rotation and cutting of the first cutter head 1-1 is provided by the power supply sliding contact wire rail groove 6-1 installed at the multi-stage tower-shaped frame 3-1 and the power supply sliding contact wire 6-2 installed at the tail of the shaft of the first cutter head 1-1. The power supply sliding contact wire rail groove 6-1 is arranged around the multi-stage tower-shaped frame 3-1, and the sliding contact wire 6-2 runs smoothly in the sliding contact wire rail groove, providing power supply for the rotation of the first cutter head 1-1. When the first conveyor belt 2-1 carrying the first cutter head 1-1 runs around the multi-stage tower-shaped frame 3-1 to cut the rock and soil, the horizontal reverse thrust generated by the rock and soil resistance in the tunnel axial direction is transmitted from the first cutter head 1-1 to the first conveyor belt 2-1, causing the first conveyor belt 2-1 to shift laterally and affecting normal operation. The rolling wheels 13-1 for controlling the non-lateral shift of the first conveyor belt 2-1 are installed on the first conveyor belt 2-1 at the tail of the shaft of the first cutter head 1-1, and the wheel grooves 13-2 of the control rolling wheels are installed at the multi-stage tower-shaped frame 3-1, arranged around the track of the rolling wheels 13-1. The rolling wheels 13-1 for non-lateral shift roll in the rolling wheel grooves B 13-2 of the control rolling wheels, preventing the first conveyor belt 2-1 from shifting laterally.

[0062] The second conveyor belt 2-2 carries the second cutter head 1-2 and runs around the tower-shaped frame at the second outer stage 3-2 of the tower-shaped frame. Its working principle is the same as that of the first conveyor belt 2-1 carrying the first cutter head 1-1, and will not be elaborated here. The running directions of the second conveyor belt 2-2 and the first conveyor belt 2-1 are opposite to each other.

[0063] The third cutter head 1-3 is arranged at the end 3-3 of the multi-stage tower-shaped frame. While more than one third cutter head 1-3 at the end rotates to cut the rock and soil, it is connected by a reciprocating device 7 that drives the third cutter head 1-3 to reciprocate horizontally and performs reciprocating operation. More than one third cutter head 1-3 reciprocates together, eliminating the rock and soil parts that cannot be reached between the third cutter heads.

[0064] When the third cutter head 1-3 advances, the horizontal reverse thrust generated by the rock and soil resistance in the tunnel axial direction is transmitted from the third cutter head 1-3 to the reciprocating device 7. To prevent the third cutter head 1-3 or the reciprocating device 7 from shifting backward, a non-offset rolling wheel 8-1 is installed at the shaft tail of the third cutter head 1-3, and a rolling wheel groove 8-2 is installed at the end 3-3 of the multi-stage tower-shaped frame. When more than one third cutter head 1-3 is driven by the reciprocating device 7 to reciprocate, the rolling wheel 8-1 that controls the third cutter head 1-3 from shifting backward runs in the control rolling wheel groove 8-2, so that the third cutter head 1-3 does not shift backward when performing reciprocating operation at the end 3-3 of the multi-stage tower-shaped frame. In this way, when the first cutter head 1-1, the second cutter head 1-2, and the third cutter head 1-3 rotate and cut together, the entire tunnel section is covered by the running track of the rotating cutting cutter head, realizing blind area-free full-coverage tunneling.

Claims

1. A shield machine, characterized in that: It includes a tower-shaped frame, a conveyor belt driving device, a cutter head driving device, a tile assembling machine, a shield device, and a slag discharging device; the tower-shaped frame is a detachable tower-shaped frame; a conveyor belt is arranged on the outer edge of the tunneling end of the tower-shaped frame, and the conveyor belt is driven by the conveyor belt driving device to run around the outer edge of the tower-shaped frame; a cutter head is arranged at the end of the tunneling end of the tower-shaped frame and on the conveyor belt, and the cutter head is driven by the cutter head driving device to rotate; the conveyor belt driving device includes more than one pair of power support wheels; the conveyor belt is driven by the power support wheels to run; the cutter head driving device includes a power supply sliding contact wire and a power supply sliding contact wire groove, the power supply sliding contact wire groove is fixedly connected to the tower-shaped frame below the conveyor belt, and the power supply sliding contact wire is arranged in the power supply sliding contact wire groove; one end of the power supply sliding contact wire is connected to the tail of the cutter head shaft to provide power for the rotation of the cutter head.

2. The shield machine according to claim 1, wherein: It includes a device for preventing the conveyor belt from sagging, and the device for preventing the conveyor belt from sagging includes a suspension walking wheel groove fixedly connected to the tower-shaped frame and suspension walking wheels installed on both sides of the conveyor belt, and the suspension walking wheels are carried by the conveyor belt to run in the suspension walking wheel groove.

3. A shield machine as claimed in claim 1, characterized in that: The tunneling end of the tower-shaped frame is arranged in a "convex"-shaped step, and a conveyor belt is arranged on the outer edge of each "convex"-shaped frame body.

4. The shield machine according to claim 3, wherein: The running directions of any two adjacent conveyor belts are opposite to each other.

5. A shield machine according to claim 4, characterized in that: The cutter head arranged at the end of the tunneling end of the tower-shaped frame is driven by a reciprocating device to make a reciprocating motion.

6. A shield machine as claimed in claim 5, wherein: The cutter heads on different conveyor belts have the same or different sizes.

7. A shield machine according to any one of claims 3 to 6, characterized in that: A rolling wheel groove is arranged on the rear shaft side of the cutter head arranged at the end of the tunneling end of the tower-shaped frame, and a rolling wheel is arranged in the rolling wheel groove.

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