Spiral conveyor and belt conveyor coexistence type dual-mode shield capable of achieving rapid mode changing

Abstract

The utility model relates to a spiral conveyor and belt conveyor coexistence type dual-mode shield capable of achieving rapid die changing. The spiral conveyor and belt conveyor coexistence type dual-mode shield comprises a supporting frame, a bottom spiral conveyor, a center belt conveyor, a rotary connector, a cutter head nozzle changing mechanism, a cutter head slag scraping plate, a cutter head slag sliding plate and a center slag receiving hopper. The supporting frame is located behind the cutter head and the soil bin, fixedly connected with the shield body and used for supporting the bottom spiral conveyor and the center belt conveyor to move in a front-back telescopic mode. In the EPB mode, the bottom spiral conveyor is low in front and high in rear, and the front end of the spiral conveyor extends into the soil bin to convey soil residues backwards; in the TBM mode, the front end of the center belt conveyor receives soil slag of the center slag receiving hopper and conveys the soil slag backwards. Through the reasonable distribution design structure, coexistence and independent operation of the bottom spiral conveyor and the center belt conveyor are achieved, the operation steps in the dual-mode shield mode changing process are simplified, the mode switching efficiency is greatly improved, the downtime is effectively shortened, and rapid mode changing is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of composite stratum tunnel shield construction, and more specifically, to a double-mode shield with a coexistence of a screw conveyor and a belt conveyor for realizing rapid mold change. Background Art

[0002] With the rapid development of underground engineering, more and more tunnel excavation is carried out by shield method; however, my country's geological conditions are complex and changeable, especially in the excavation of composite strata, single-mode shield equipment is difficult to meet the construction needs. In order to meet the situation of alternating different geological conditions, dual-mode shield came into being. With the large-scale application of dual-mode shield, construction personnel found that although dual-mode shield can switch the corresponding working mode according to different strata, the mode conversion is time-consuming and inefficient. If the mold is frequently changed, it will have a greater impact on the construction period. In addition, in the existing construction, the average mold change time of dual-mode shield is about 30 days. If the surrounding rock geology of the mold change location is poor, long-term shutdown is likely to cause the surrounding rock to converge and deform and squeeze the shield body, and then cause the shield body to lock, causing great engineering losses. Therefore, the rapid mold change of dual-mode shield is extremely important for the efficient construction of composite stratum shield.

[0003] In the prior art, the Chinese utility model patent document with authorization announcement number CN220487586U discloses a dual-mode shield machine and a tunnel excavation system. The dual-mode shield machine includes a cutter head, a main drive mechanism and a mode switching mechanism, which is connected to or removed from a mounting member through the mode switching mechanism so that the dual-mode shield machine can switch between a first functional mode and a second functional mode. The dual-mode shield machine improves the structure of the main drive mechanism and the mode switching mechanism to achieve a rapid transition between the center rotary joint in the EPB mode and the center screw machine in the TBM mode during the mode switching process. Although it can play a certain positive role in improving the mold rotation speed, for the dual-mode shield mold changing process, the switching of the EPB / TBM mode involves complex processes such as the removal and replacement of the conveying mechanism, the structural adjustment of the rotary device, and the pipeline. It is only the improvement of the mode switching mechanism at the main drive mechanism, and the efficiency improvement effect is relatively limited. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a dual-mode shield machine in which a screw conveyor and a belt conveyor coexist for realizing rapid mold change.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a dual-mode shield machine in which a screw conveyor and a belt conveyor coexist for realizing rapid mold change, and the technical scheme is as follows:

[0006] A dual-mode shield machine with a screw conveyor and a belt conveyor coexisting to realize rapid mold change, characterized in that it comprises a support frame, a bottom screw conveyor, a central belt conveyor, a rotary joint, a cutter head nozzle replacement mechanism, a cutter head scraping plate, a cutter head slag sliding plate, and a central slag receiving bucket;

[0007] The support frame is located at the rear of the soil bin and is fixedly connected to the shield body, and is used to support the bottom screw conveyor and the center belt conveyor to move forward and backward; the swivel joint is used to be installed at the rear end of the soil bin panel, and a soil bin connecting ring for connecting the soil bin is provided at the front of the swivel joint, and a pipeline interface connected to the external pipeline is provided on the swivel joint; the cutter head nozzle replacement mechanism is provided on the cutter head panel, including a cutter head nozzle of a back-drawn shell detachable type, the cutter head nozzle is used for spray dust suppression in TBM mode, and the end of the cutter head nozzle is blocked by a blocking structure in EPB mode; multiple cutter head scraper plates and cutter head slag chute plates are provided, in TBM mode, the cutter head scraper plate is provided on the cutter head panel, and the cutter head slag chute plate is provided in the cutter head, and the cutter head slag chute plate is connected to the center slag receiving bucket behind, and after the cutter breaks the rock, the cutter head scraper plate sends the broken rock from the soil bin to the cutter head slag chute plate, and centrally transports it to the center slag receiving bucket;

[0008] The bottom screw conveyor includes a casing, a screw shaft inside the casing and a screw drive motor. The front end of the casing is provided with a screw machine slag inlet, the rear end is provided with a screw machine slag outlet, a screw blade is provided on the screw shaft, and the screw drive motor is provided at the rear end of the casing for driving the screw shaft to rotate. The outside of the casing is connected to the support frame through a screw machine moving cylinder, and the two ends of the screw machine moving cylinder are respectively hinged to the casing and the support frame. In the EPB mode, the bottom screw conveyor is low in front and high in the back, and the front end of the screw conveyor extends into the soil bin to transport soil slag backwards;

[0009] A front pulley is provided at the front of the center belt conveyor and a rear pulley is provided at the rear. A front support for supporting the movement of the front pulley and a rear support for supporting the movement of the rear pulley are provided in the shield body. The front and rear of the center belt conveyor are connected to the shield body through belt conveyor moving cylinders respectively. The two ends of the belt conveyor moving cylinder are hinged to the center belt conveyor and the shield body respectively. The center belt conveyor is located in the center of the shield body. In TBM mode, the front end of the center belt conveyor receives the soil and slag from the center slag bucket and transports it backwards.

[0010] Furthermore, the number of the blade scraping plates is 6-8.

[0011] Furthermore, a buffer slope is provided at the slag outlet of the screw conveyor.

[0012] Furthermore, the cutter disc nozzle includes a nozzle inner cylinder section, and the sealing structure includes a nozzle cover plate. In the EPB mode, the nozzle inner cylinder section is sealed by the nozzle cover plate, and in the TBM mode, a top rubber pad and an inner pressure ring are provided at the end of the nozzle inner cylinder section for spraying dust removal spray.

[0013] In summary, the utility model has the following beneficial effects:

[0014] (1) Compared with the existing technology, the complicated steps of dismantling the traditional double-mode shield and transporting the screw conveyor and belt conveyor are avoided during the mold change process, simplifying the overall operation steps of the double-mode shield mold change process;

[0015] (2) Reasonable equipment layout, using a coexistence structure of a bottom screw conveyor and a central belt conveyor, which does not interfere with other shield machine equipment and enriches the functions of the shield machine;

[0016] (3) Different slag discharge facilities are used in TBM mode and EPB mode to discharge slag. Compared with the structure with only a central screw machine, the wear of the screw machine is greatly reduced, avoiding excessive wear of the screw machine; avoiding frequent replacement of slag discharge equipment, reducing the frequency of equipment maintenance and replacement, and helping to improve overall work efficiency;

[0017] (4) Comprehensively improve the TBM / EPB mode switching speed. Compared with the average mold change time of 30 days for traditional dual-mode shield machines, the average mold change time in actual applications of the utility model is 7 days, which greatly improves the dual-mode shield machine mode conversion efficiency;

[0018] (5) Reduce downtime during mode conversion, thereby reducing the frequency of shield jamming caused by the convergence and deformation of the surrounding rock when the shield stays in unstable formations for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of a specific embodiment 1 of a dual-mode shield machine with a screw conveyor and a belt conveyor coexisting to realize rapid mold change of the utility model;

[0020] Figure 2 It is a schematic diagram of the positions of the central belt conveyor, the bottom screw conveyor and the slag discharge and receiving bucket in a specific embodiment 1 of a dual-mode shield machine with a screw conveyor and a belt conveyor coexisting to realize rapid mold change of the utility model;

[0021] Figure 3 It is a structural schematic diagram of the cutter head scraping plate and the cutter head slag sliding plate in a specific embodiment 1 of a dual-mode shield machine with a screw conveyor and a belt conveyor coexisting to realize rapid mold change of the utility model;

[0022] Figure 4 It is a structural schematic diagram of a swivel joint in a specific embodiment 1 of a dual-mode shield machine with a screw conveyor and a belt conveyor coexisting to realize rapid mold change of the utility model;

[0023] Figure 5 It is a structural schematic diagram of a knife disc nozzle replacement mechanism in a specific embodiment 1 of a dual-mode shield machine with a screw conveyor and a belt conveyor coexisting to realize rapid mold change of the utility model;

[0024] Figure 6 This is a schematic structural diagram of a bottom screw conveyor in a specific embodiment 1 of a dual-mode shield machine that can realize rapid mold change and coexistence of a screw conveyor and a belt conveyor;

[0025] Figure 7 It is a structural schematic diagram of the central belt conveyor in a specific embodiment 1 of a dual-mode shield machine with a screw conveyor and a belt conveyor coexisting to realize rapid mold change of the utility model;

[0026] Figure numerals: 1-bottom screw conveyor; 2-center belt conveyor; 3-support frame; 4-swivel joint; 41-soil bin connecting ring; 42-pipeline interface; 43-swivel joint structure; 5-cutter head nozzle replacement mechanism; 51-nozzle inner cylinder section; 52-nozzle cover plate; 6-cutter head scraping plate; 7-cutter head slag sliding plate; 8-center slag receiving bucket; 9-slag discharge slag receiving bucket; 10-cutter head panel; 11-screw shaft; 121-screw blade; 122-head barrel section; 123-barrel section connecting joint; 124-head protection plate; 13-first fuselage barrel section; 14-second fuselage barrel section; 141-observation window; 15-third fuselage barrel section; 151-articulated seat; 152-telescopic cylinder; 16-screw drive motor; 17-slag outlet of screw machine; 21-front pulley; 23-front support; 24-rear pulley; 25-rear support; 26-belt conveyor moving cylinder. DETAILED DESCRIPTION

[0027] The utility model is described in detail below in conjunction with the accompanying drawings.

[0028] A specific embodiment 1 of a dual-mode shield machine with a screw conveyor and a belt conveyor coexisting to realize rapid mold change of the utility model:

[0029] like Figure 1-Figure 2 As shown, a dual-mode shield machine with coexistence of a screw conveyor and a belt conveyor for realizing rapid mold change comprises a bottom screw conveyor 1, a central belt conveyor 2, a support frame 3, a swivel joint 4, a cutter disc nozzle replacement mechanism 5, a cutter disc scraping plate 6, a cutter disc slag chute 7, and a central slag receiving bucket 8.

[0030] The support frame 3 is located behind the cutter head and soil bin and connected to the shield body. It is actually used to support the bottom screw conveyor 1 and the center belt conveyor 2 to move forward and backward. The swivel joint 4 is installed at the rear end of the soil bin panel. Figure 4As shown, a soil bin connection ring 41 for connecting the soil bin is provided at the front of the swivel joint, and a swivel joint structure 43 is provided at the rear; a pipeline interface 42 connected to an external pipeline is also provided on the swivel joint 4. The swivel joints include TBM swivel joints and EPB swivel joints, which have similar structures but different internal pipelines, so they need to be replaced during the mold change process. The internal pipelines of the TBM swivel joint mainly include water pipes, hydraulic pipelines, etc., and the internal pipelines of the EPB swivel joint include grease pipelines, foam pipelines, and bentonite pipelines.

[0031] like Figure 5 As shown, the cutter head nozzle replacement mechanism 5 is arranged on the cutter head panel 10, and includes a cutter head nozzle of the back-drawn shell detachable type. The cutter head nozzle includes a nozzle inner barrel section 51, and the end of the cutter head nozzle is blocked by a blocking structure in the EPB mode. The blocking structure includes a nozzle cover plate 52, so that the nozzle inner barrel section 51 in the EPB mode is blocked by the nozzle cover plate 52. In the TBM mode, the cutter head nozzle is used to spray spray for dust removal. In the TBM mode, a top rubber pad and an inner pressure ring are provided at the end of the nozzle inner barrel section 51 for spraying dust removal spray.

[0032] like Figure 3 As shown, multiple cutter disc scraping plates 6 and cutter disc slag sliding plates 7 are provided. In this embodiment, 6 to 8 cutter disc scraping plates are provided as required. In TBM mode, the cutter disc scraping plates 6 are provided on the cutter disc panel, and the cutter disc slag sliding plates 7 are provided inside the cutter disc. The cutter disc slag sliding plates 7 are connected to a central slag receiving bucket 8 behind them. After the cutter breaks the rock, the cutter disc scraping plates 6 send the broken rock from the soil bin to the cutter disc slag sliding plates 7, and then transport them to the central slag receiving bucket 8 in a centralized manner.

[0033] like Figure 6As shown, the bottom screw conveyor 1 includes a casing, a screw shaft 11 inside the casing and a screw drive motor 16. The front end of the casing is provided with a screw machine slag inlet, and the rear end is provided with a screw machine slag outlet 17. A spiral blade 121 is provided on the screw shaft, and the screw drive motor 16 is provided at the rear end of the casing to drive the screw shaft to rotate. The outside of the casing is connected to the support frame 3 through a screw machine moving cylinder, and the two ends of the screw machine moving cylinder are respectively hinged to the casing and the support frame 3. The casing of the bottom screw conveyor includes a head barrel section and three body barrel sections connected in sequence from front to back, and the three body barrel sections are respectively the first body barrel section 13, the second body barrel section 14, and the third body barrel section 15 from front to back. The front end of the head barrel section 122 is open to form the screw machine slag inlet, and a head protection plate 124 is provided on the outside of the head barrel section 122 to protect the internal screw shaft. The head casing 122 and the first fuselage barrel section 13, and the first fuselage barrel section 13 and the second fuselage barrel section 14 are connected through the barrel section connection joint 123. An observation window 141 is provided on the outside of the fuselage barrel section to facilitate real-time judgment of the slag discharge status of the bottom screw conveyor. The spiral drive motor is arranged outside the rear end of the third fuselage barrel section 15. As the core device of the bottom screw conveyor, it adopts a bidirectional motor and is equipped with an electronic control and hydraulic system to adjust the rotation speed of the spiral blade to match the propulsion speed of the cutter disc. At the same time, it has a forward / reverse function to avoid excessive friction of the spiral blade to form a soil plug. The front end sliding sleeve of the third fuselage barrel section 15 is arranged outside the rear end of the second fuselage barrel section 14, and a telescopic cylinder 152 for controlling the telescopic extension of the second fuselage barrel section is arranged between the third fuselage barrel section 15 and the second fuselage barrel section 14. The two ends of the telescopic oil cylinder 152 are respectively hinged to the hinged seats 151 on the third fuselage barrel section 15 and the second fuselage barrel section 14. The posture and position of the bottom screw conveyor can be adjusted through the telescopic oil cylinder 152, which plays a role of flexible adjustment. In the EPB mode, the bottom screw conveyor 1 is low in the front and high in the back, and the front end of the bottom screw conveyor 1 extends into the soil bin and transports soil residue backwards. In the soil pressure mode, ensure that the bottom screw conveyor body and the screw machine seat are connected by bolts before starting the screw machine drive motor.

[0034] like Figure 7 As shown, the front part of the central belt conveyor 2 is provided with a front pulley 21, and the rear part is provided with a rear pulley 24, and the shield body is provided with a front support 23 for supporting the movement of the front pulley and a rear support 25 for supporting the movement of the rear pulley. The front and rear parts of the central belt conveyor are connected to the shield body through the belt conveyor moving cylinder 26, respectively, and the two ends of the belt conveyor moving cylinder 26 are respectively hinged to the central belt conveyor 2 and the shield body. The central belt conveyor 2 is located in the center of the shield body. In the TBM mode, the front end of the central belt conveyor receives the soil and slag from the central slag bucket 8 and transports it backwards.

[0035] like Figure 2As shown, a slag receiving bucket 9 for receiving the slag is arranged behind the slag outlet of the central belt conveyor 2 and the bottom screw conveyor 1, wherein a buffer slope is arranged at the slag outlet 17 of the screw conveyor to prevent the slag receiving bucket 9 from being damaged by crushed stones with too large particle size.

[0036] A mold changing method for a dual-mode shield machine with a screw conveyor and a belt conveyor coexisting in order to realize rapid mold changing according to the utility model comprises the following steps:

[0037] S1: When switching from TBM mode to EPB mode, start the belt conveyor moving cylinder to drive the central belt conveyor to retreat to its position under the action of the front pulley and the rear pulley, start the screw conveyor moving cylinder to control the bottom screw conveyor to extend, and then control the bottom screw conveyor head to extend into the designated position at the bottom of the soil bin. Specifically, a belt conveyor slag bucket is set at the rear end of the central belt conveyor, and the belt conveyor slag bucket is removed before the central belt conveyor retreats to the highest point to avoid interference with the front end pipeline on the top of the connecting bridge.

[0038] S2: Disassemble the TBM swivel joint, install the EPB swivel joint and complete the external pipeline connection, remove the scraper plate and slag plate of the cutter disc, then remove the inner barrel section of the nozzle from the back of the cutter disc, remove the top rubber pad and inner pressure ring, and install the nozzle cover. Specifically, the specific operation of connecting the EPB swivel joint to the external pipeline is to connect the corresponding grease pipeline, foam pipeline and bentonite pipeline; before the central belt conveyor returns to the highest point, remove the belt conveyor slag bucket to avoid interference with the front pipeline at the top of the connecting bridge.

[0039] S3: Control the screw machine moving cylinder and telescopic cylinder to fine-tune the position of the screw machine's slag outlet to ensure that the screw machine's slag outlet is aligned with the rear slag discharge hopper, and start the screw drive motor to enable the screw blades to achieve normal slag discharge in the soft soil layer.

[0040] S4: When switching from EPB mode to TBM mode, turn off the screw drive motor, control the bottom screw conveyor to retreat through the screw machine moving cylinder, close the soil bin door, and adjust the screw machine slag outlet position to avoid occupying the position directly above the slag receiving bucket. Specifically, before the bottom screw conveyor retreats, ensure that the slag inside the bottom screw conveyor has been cleaned; after the bottom screw conveyor retreats to its proper position, turn off the screw machine moving cylinder control power supply to avoid misoperation causing the bottom screw conveyor to extend again.

[0041] S5: Remove the EPB swivel joint, install the TBM swivel joint and complete the external pipeline connection, position and weld the cutter head scraper plate and cutter head slag slide plate on the cutter head, then remove the nozzle inner cylinder section from the back of the cutter head, remove the nozzle cover plate, install the top rubber pad and inner pressure ring, and remove dust through the cutter head nozzle. Specifically, the specific operation of connecting the TBM swivel joint to the external pipeline is to connect the corresponding water pipes and hydraulic pipes.

[0042] S6: Install the central slag receiving bucket to the position of the cutter disc gate opening, start the belt moving cylinder, and drive the central belt conveyor forward under the action of the front pulley and the rear pulley. Specifically, first control the belt moving cylinder to drive the central belt conveyor to slowly extend 500m, install the belt conveyor slag bucket at the rear end, and then continue to control the central belt conveyor to move forward to avoid interference with the main drive internal grease pipeline, the main drive slag chute, the segment crane support seat, and the secondary gate of the screw conveyor during the extension process of the central belt conveyor. When the front end of the central belt conveyor extends into the excavation bin, the central belt conveyor is completely moved forward to its position.

[0043] S7: Start the central belt conveyor to transport slag to the slag receiving bucket in the TBM mode.

[0044] Beneficial effect: The utility model provides a dual-mode shield machine with coexistence of a screw conveyor and a belt conveyor for rapid mold change, wherein the bottom screw conveyor and the center belt conveyor coexist without interfering with each other. Since the steps of retracting the equipment bridge and the rear supporting equipment, dismantling and transporting the M-beam cross brace and the transition platform, transporting the screw machine disassembly and assembly tooling and assembly machine support, dismantling and transporting the screw machine installed at the bottom of the EPB mode, transporting and installing the screw machine installed in the center of the TBM mode, dismantling and transporting the screw conveyor disassembly and assembly tooling, moving forward and connecting the equipment bridge and the rear supporting equipment are reduced, the construction steps are greatly improved, aiming to improve the conversion efficiency of the dual-mode shield machine mode and improve the construction efficiency. To a certain extent, it can avoid the problem of machine jamming caused by long-term shutdown, thereby achieving the purpose of rapid mold change and saving construction time.

[0045] The above are only preferred implementations of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims

1. A dual-mode shield machine with a screw conveyor and a belt conveyor coexisting to achieve rapid mold change, characterized in that: It includes a support frame, a bottom screw conveyor, a central belt conveyor, a rotary joint, a cutter head nozzle replacement mechanism, a cutter head scraper plate, a cutter head slag slide plate, and a central slag receiving bucket; The support frame is located at the rear of the soil bin and is fixedly connected to the shield body, and is used to support the bottom screw conveyor and the center belt conveyor to move forward and backward; the swivel joint is used to be installed at the rear end of the soil bin panel, and a soil bin connecting ring for connecting the soil bin is provided at the front of the swivel joint, and a pipeline interface connected to the external pipeline is provided on the swivel joint; the cutter head nozzle replacement mechanism is provided on the cutter head panel, including a cutter head nozzle of a back-drawn shell detachable type, the cutter head nozzle is used for spray dust suppression in TBM mode, and the end of the cutter head nozzle is blocked by a blocking structure in EPB mode; multiple cutter head scraper plates and cutter head slag chute plates are provided, in TBM mode, the cutter head scraper plate is provided on the cutter head panel, and the cutter head slag chute plate is provided in the cutter head, and the cutter head slag chute plate is connected to the center slag receiving bucket behind, and after the cutter breaks the rock, the cutter head scraper plate sends the broken rock from the soil bin to the cutter head slag chute plate, and centrally transports it to the center slag receiving bucket; The bottom screw conveyor includes a casing, a screw shaft inside the casing and a screw drive motor. The front end of the casing is provided with a screw machine slag inlet, the rear end is provided with a screw machine slag outlet, a screw blade is provided on the screw shaft, and the screw drive motor is provided at the rear end of the casing for driving the screw shaft to rotate. The outside of the casing is connected to the support frame through a screw machine moving cylinder, and the two ends of the screw machine moving cylinder are respectively hinged to the casing and the support frame. In the EPB mode, the bottom screw conveyor is low in front and high in the back, and the front end of the screw conveyor extends into the soil bin to transport soil slag backwards; A front pulley is provided at the front of the center belt conveyor and a rear pulley is provided at the rear. A front support for supporting the movement of the front pulley and a rear support for supporting the movement of the rear pulley are provided in the shield body. The front and rear of the center belt conveyor are connected to the shield body through belt conveyor moving cylinders respectively. The two ends of the belt conveyor moving cylinder are hinged to the center belt conveyor and the shield body respectively. The center belt conveyor is located in the center of the shield body. In TBM mode, the front end of the center belt conveyor receives the soil and slag from the center slag bucket and transports it backwards.

2. A dual-mode shield machine with a screw conveyor and a belt conveyor coexisting to achieve rapid mold change as claimed in claim 1, characterized in that: The number of the knife disc scraping plates is 6 to 8.

3. A dual-mode shield machine with a screw conveyor and a belt conveyor coexisting to achieve rapid mold change as claimed in claim 1, characterized in that: A buffer slope is set at the slag outlet of the screw conveyor.

4. A dual-mode shield machine with a screw conveyor and a belt conveyor coexisting to achieve rapid mold change as claimed in claim 1, characterized in that: The cutter head nozzle includes a nozzle inner cylinder section, and the sealing structure includes a nozzle cover plate. In the EPB mode, the nozzle inner cylinder section is sealed by the nozzle cover plate. In the TBM mode, a top rubber pad and an inner pressure ring are arranged at the end of the nozzle inner cylinder section for spraying dust removal spray.

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