Telescopic double-screw conveyor structure of shield tunneling machine

Abstract

The telescopic double-screw conveyor structure of the shield tunneling machine comprises a first-stage screw structure, a connecting ball bearing, a second-stage screw structure and a second-stage screw guide rail device, a first-stage screw machine shaft, a fixed joint, a middle joint and a telescopic inner joint of the first-stage screw structure are sequentially connected, and the telescopic inner joint is arranged in a front telescopic outer joint; one end of the rear telescopic outer joint is connected with the front telescopic outer joint, and the other end is connected with an outer ring of the primary driving mechanism; the telescopic oil cylinder is arranged on the middle section; a piston rod of the telescopic oil cylinder is connected with the front telescopic outer section; the second-stage spiral structure comprises a second-stage spiral machine shaft, a second-stage front end section, a second-stage rear end section and a second-stage driving mechanism; the fixed joint of the first-stage spiral structure is fixed on the equipment bridge, and the second-stage spiral structure is connected with the equipment bridge; the second-stage spiral structure and the first-stage spiral structure are connected through a connecting ball bearing; and a belt conveyor tail assembly structure is arranged below the secondary spiral structure. The anti-gushing device can effectively prevent gushing, dredging and deslagging are facilitated, and the blocking phenomenon in the tunneling process is prevented.

Description

Technical Field

[0001] The invention relates to a telescopic double-screw conveyor structure for a shield machine, belonging to the technical field of engineering machinery. Background Art

[0002] At present, conventional earth pressure balance shield machines all use a first-stage screw conveyor to discharge slag. However, due to the length limitation of the screw conveyor, its pressure bearing capacity is also correspondingly limited, resulting in the inability of conventional earth pressure balance shield machines to operate under geological conditions with large amounts of water and high water pressure. The use of slurry balance shield machines not only has high equipment and construction costs, but also makes the mud circulation system difficult to maintain and cannot meet the excavation needs of gravel-rich and locally hard rock formations. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a telescopic double-screw conveyor structure for a shield machine in view of the defects in the prior art.

[0004] In order to solve this technical problem, the present invention provides a telescopic double-screw conveyor structure of a shield machine, comprising a primary spiral structure, a connecting ball bearing, a secondary spiral structure, and a secondary spiral guide rail device. The primary spiral structure comprises a primary screw machine shaft, a fixed section, an intermediate section, a telescopic inner section, a telescopic oil cylinder, a front telescopic outer section, a rear telescopic outer section, a primary drive mechanism, and a hoisting mechanism; the primary screw machine shaft, the fixed section, the intermediate section, and the telescopic inner section are connected in sequence, the telescopic inner section is placed in the front telescopic outer section, one end of the rear telescopic outer section is connected to the front telescopic outer section, and the other end is connected to the outer ring of the primary drive mechanism; the telescopic oil cylinder is arranged on the intermediate section, and its piston rod is connected to the front telescopic outer section to drive the front telescopic outer section. The outer section and the rear telescopic outer section perform telescopic movement relative to the telescopic inner section; the secondary spiral structure includes a secondary screw machine shaft, a secondary front end section, a secondary rear end section and a secondary drive mechanism; the fixed section of the primary spiral structure is fixed to the equipment bridge through the front shield screw machine seat, and the secondary spiral structure is connected to the equipment bridge through a secondary spiral guide device; the secondary spiral structure and the primary spiral structure are connected through connecting ball bearings arranged on the secondary front end section and the rear telescopic outer section. When the telescopic oil cylinder is actuated, the secondary spiral structure then telescopes the outer section on the secondary spiral guide device; a belt conveyor tail assembly structure is provided below the secondary spiral structure, which is used to transport the debris dropped by the entire double screw conveyor.

[0005] The first-stage screw shaft is placed inside the cylinder connected by a fixed section, an intermediate section, a telescopic inner section, a front telescopic outer section and a rear telescopic outer section, and its end is connected to the inner ring of the first-stage drive mechanism. The first-stage drive mechanism drives the first-stage screw shaft to rotate and transport the slag; the fixed section and the rear telescopic outer section are both equipped with a soil pressure sensor, which can monitor the water and soil pressure in the cylinder in real time; the slag discharge door is installed at the bottom of the rear telescopic outer section.

[0006] A guide sleeve is provided between the telescopic inner section and the front telescopic outer section, which plays a guiding and anti-twisting role when the telescopic cylinder is extended and retracted; a sealing mounting ring is provided between the telescopic inner section and the front telescopic outer section, which plays a sealing and leakage-proof role when the telescopic cylinder is extended and retracted.

[0007] The first-level spiral structure also includes a guide sleeve, a sealing mounting ring, a slag discharge door and a soil pressure sensor. The first-level spiral structure also includes a pull-out window and a manual observation window. The pull-out window is arranged on both sides of the fixed section, and the middle section and the rear telescopic outer section are respectively equipped with a manual observation window.

[0008] The connecting ball bearing includes an embedded cylinder segment, a spherical bearing and a bottom flange. The embedded cylinder segment is embedded in the inner ring of the spherical bearing and connected to the primary spiral structure. The bottom flange is installed on the outer ring of the spherical bearing and connected to the secondary spiral structure. The primary and secondary spiral structures can rotate and swing with each other, which is convenient for turning and climbing during equipment construction.

[0009] The secondary spiral structure also includes a second slag discharge door, a blocking plate, a water collecting bucket, a second soil pressure sensor and a drainage pipe. One end of the secondary front end section is provided with a blocking plate, and the other end is connected to the secondary rear end section. The outer ring of the secondary drive mechanism is fixed to the secondary rear end section; the secondary screw shaft is placed inside the cylinder of the secondary front end section and the secondary rear end section, and one end is fixed to the inner ring of the secondary drive mechanism. Under the drive of the secondary drive mechanism, the secondary screw shaft rotates to transport the slag; the second slag discharge door is installed at the bottom of the secondary rear end section and docks with the tail assembly of the belt conveyor to discharge slag; the secondary front end section of the secondary spiral structure is provided with a second soil pressure sensor, which can monitor the water and soil pressure in the cylinder in real time.

[0010] A water collecting bucket is provided at the bottom of the secondary front end section. When the water content in the cylinder is large, it can flow into the water collecting bucket; a drainage pipe is provided on the side of the water collecting bucket to drain the water in the water collecting bucket; a manual observation window 2 is provided at the bottom of the water collecting bucket to facilitate the detection of jams and blockages in the water collecting bucket.

[0011] The secondary spiral structure also includes a second pull-out window, which is arranged on the side of the secondary front end section. During the construction process, it is easy to find jams and blockages in the cylinder and facilitate unblocking.

[0012] The secondary spiral guide rail device is a bilaterally symmetrical structure, including a support seat, a roller, a track, support one, support two, support three, support four and support five. The support seat is welded and fixed to the secondary rear end section of the secondary spiral structure. The track is fixed to the equipment bridge through support one, support two, support three, support four and support five. One end of the roller is fixed to the support seat by a connecting bolt, and the other end is embedded in the track groove with a gap. Under the drive of the telescopic cylinder of the primary spiral structure, the roller rolls back and forth in the track, realizing the telescopic movement of the secondary spiral structure along the track direction of the secondary spiral guide rail device.

[0013] The hoisting mechanism is an adjustable pull rod mechanism, one end of the pull rod seat is fixed on the main drive box, and the other end of the pull rod seat is welded to the intermediate section. When hoisting the primary spiral structure, the inclination angle of the primary spiral structure can be fine-tuned.

[0014] Beneficial effects: The retractable double-screw conveyor structure of the shield machine of the present invention, on the one hand, lengthens the screw conveyor and reduces the water pressure, which can effectively prevent gushing and is conducive to adapting to geological conditions with large water content and high water pressure; on the other hand, the primary and secondary spiral structures can be retracted and extended at the same time, which is conducive to unblocking slag and preventing jamming during excavation, and can meet the excavation needs of gravel-containing and hard strata. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall assembly structure of the present invention; Figure 2 Schematic diagram of the structure of the primary helix of the present invention; Figure 3 A schematic cross-sectional view of the structure of the connecting ball bearing of the present invention; Figure 4 Schematic diagram of the structure of the secondary helical structure of the present invention; Figure 5 It is a schematic side view of the structure of the secondary helical structure of the present invention; Figure 6 This is a schematic front view of the structure of the secondary spiral guide rail device of the present invention; Figure 7 A schematic side view of the structure of the secondary spiral guide rail device of the present invention; Figure 8 For the present invention Figure 7 AA cross-sectional view of .

[0016] In the figure: 1. First-stage spiral structure; 101. First-stage screw shaft; 102. Fixed section; 103. Intermediate section; 104. Telescopic inner section; 105. Guide sleeve; 106. Telescopic cylinder; 107. Front telescopic outer section; 108. Sealing mounting ring; 109. Rear telescopic outer section; 110. Slag discharge door 1; 111. First-stage driving mechanism; 112. Sliding window 1; 113. Manual observation window 1; 114. Soil pressure sensor 1; 115. Hoisting mechanism; 2. Connecting ball bearing; 201. Embedded cylinder section; 202. Spherical bearing; 203. Bottom flange; 3. Second-stage spiral structure; 301. Second-stage Conveyor shaft; 302, secondary front section; 303, secondary rear section; 304, secondary drive mechanism; 305, slag discharge door 2; 306, blocking plate; 307, water collecting bucket; 308, soil pressure sensor 2; 309, sliding window 2; 310, drainage pipe; 311, manual observation window 2; 4, secondary spiral guide device; 401, support seat; 402, roller; 403, track; 404, support 1; 405, support 2; 406, support 3; 407, support 4; 408, support 5; 5, front shield conveyor seat; 6, belt conveyor tail assembly structure; 7, equipment bridge; 8, front shield soil bin. DETAILED DESCRIPTION

[0017] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0018] like Figures 1-8As shown, the present invention provides a telescopic double-screw conveyor structure of a shield machine, including a primary spiral structure 1, a connecting ball bearing 2, a secondary spiral structure 3, and a secondary spiral guide rail device 4. The primary spiral structure 1 includes a primary screw shaft 101, a fixed section 102, an intermediate section 103, a telescopic inner section 104, a telescopic oil cylinder 106, a front telescopic outer section 107, a rear telescopic outer section 109, a primary drive mechanism 111 and a hoisting mechanism 115; the primary screw shaft 101, the fixed section 102, the intermediate section 103, and the telescopic inner section 104 are connected in sequence, the telescopic inner section 104 is placed in the front telescopic outer section 107, one end of the rear telescopic outer section 109 is connected to the front telescopic outer section 107, and the other end is connected to the outer ring of the primary drive mechanism 111; the telescopic oil cylinder 106 is arranged on the intermediate section 103, and its piston rod is connected to the front telescopic outer section 107, which can be It drives the front telescopic outer section 107 and the rear telescopic outer section 109 to perform telescopic movement relative to the telescopic inner section 104; the secondary spiral structure 3 includes a secondary screw machine shaft 301, a secondary front end section 302, a secondary rear end section 303 and a secondary driving mechanism 304; the fixed section 102 of the primary spiral structure 1 is fixed to the equipment bridge 7 through the front shield screw machine seat 5, and the secondary spiral structure 3 is connected to the equipment bridge 7 through the secondary spiral guide device 4; the secondary spiral structure 3 and the primary spiral structure 1 are connected through the connecting ball bearing 2 arranged on the secondary front end section 302 and the rear telescopic outer section 109. When the telescopic oil cylinder 106 is actuated, the secondary spiral structure 3 then telescopes the outer section 109 on the secondary spiral guide device 4 and moves accordingly; a belt conveyor tail assembly structure 6 is provided below the secondary spiral structure 3 for transporting the debris dropped by the entire double spiral conveyor.

[0019] The first-level spiral structure 1 also includes a guide sleeve 105, a sealing mounting ring 108, a slag discharge door 110 and a soil pressure sensor 114. The first-level screw shaft 101 is placed inside a cylinder connected by a fixed section 102, an intermediate section 103, a telescopic inner section 104, a front telescopic outer section 107 and a rear telescopic outer section 109, and its end is connected to the inner ring of a first-level driving mechanism 111. The first-level driving mechanism 111 drives the first-level screw shaft 101 to rotate and transport slag; the fixed section 102 and the rear telescopic outer section 109 are both equipped with a soil pressure sensor 114, which can monitor the water and soil pressure in the cylinder in real time; the slag discharge door 110 is installed at the bottom of the rear telescopic outer section 109.

[0020] A guide sleeve 105 is provided between the telescopic inner section 104 and the front telescopic outer section 107, which plays a guiding and anti-twisting role when the telescopic cylinder 106 is telescoped; a sealing mounting ring 108 is provided between the telescopic inner section 104 and the front telescopic outer section 107, which plays a sealing and leakage-proof role when the telescopic cylinder 106 is telescoped.

[0021] The primary spiral structure 1 also includes a pull-out window 112 and a manual observation window 113. The pull-out window 112 is arranged on both sides of the fixed section 102, and the middle section 103 and the rear telescopic outer section 109 are respectively equipped with a manual observation window 113, which is convenient for timely detection of jams and blockages in the cylinder during construction and facilitates unblocking.

[0022] The connecting ball bearing 2 includes an embedded barrel section 201, a spherical bearing 202 and a bottom flange 203. The embedded barrel section 201 is embedded in the inner ring of the spherical bearing 202 and is connected to the primary spiral structure 1. The bottom flange 203 is installed on the outer ring of the spherical bearing 202 and is connected to the secondary spiral structure 3. The primary and secondary spiral structures can rotate and swing relative to each other, which is convenient for turning and climbing during equipment construction and adapts to the requirements of soft upper and hard lower strata.

[0023] The secondary spiral structure 3 also includes a slag discharge door 305, a blocking plate 306, a water collecting bucket 307, a soil pressure sensor 308 and a drainage pipe 310. One end of the secondary front end section 302 is provided with a blocking plate 306, and the other end is connected to the secondary rear end section 303. The outer ring of the secondary driving mechanism 304 is fixed on the secondary rear end section 303; the secondary screw shaft 301 is placed inside the cylinder of the secondary front end section 302 and the secondary rear end section 303, and one end is fixed to the inner ring of the secondary driving mechanism 304. Under the drive of the secondary driving mechanism 304, the secondary screw shaft 301 rotates to transport the slag; the slag discharge door 305 is installed at the bottom of the secondary rear end section 303 and docks with the tail assembly of the belt conveyor to discharge slag; the secondary front end section 302 of the secondary spiral structure 3 is provided with a soil pressure sensor 308, which can monitor the water and soil pressure in the cylinder in real time to prevent the occurrence of gushing.

[0024] A water collecting bucket 307 is provided at the bottom of the secondary front end section 302. When the water content in the cylinder is large, it can flow into the water collecting bucket 307; a drain pipe 310 is provided on the side of the water collecting bucket 307 to drain the water in the water collecting bucket 307; a manual observation window 2 311 is provided at the bottom of the water collecting bucket 307 to facilitate the detection of jams and blockages in the water collecting bucket 307 and facilitate unblocking.

[0025] The secondary spiral structure 3 further includes a second pull-out window 309 , which is arranged on the side of the secondary front end section 302 , so as to facilitate the detection of jams and blockages in the cylinder during construction and facilitate unblocking.

[0026] The secondary spiral guide rail device 4 is a left-right symmetrical structure, which provides support and guidance for the secondary spiral structure 3. Viewed from either side, the secondary spiral guide rail device 4 includes a support seat 401, a roller 402, a track 403, support one 404, support two 405, support three 406, support four 407 and support five 408. The support seat 401 is welded and fixed to the secondary rear end section 303 of the secondary spiral structure 3. The track 403 is fixed to the equipment bridge 7 through support one 404, support two 405, support three 406, support four 407 and support five 408. One end of the roller 402 is fixed to the support seat 401 by a connecting bolt, and the other end is embedded in the track 403 groove with a gap. Driven by the telescopic cylinder 106 of the primary spiral structure 1, the roller 402 rolls back and forth in the track, thereby realizing the telescopic movement of the secondary spiral structure 3 along the track direction of the secondary spiral guide rail device 4.

[0027] The hoisting mechanism 115 is an adjustable pull rod mechanism, one end of the pull rod seat is fixed to the main drive box, and the other end of the pull rod seat is welded to the intermediate section 103. When hoisting the primary spiral structure 1, the inclination angle of the primary spiral structure 1 can be fine-tuned.

[0028] The telescopic double-screw conveyor structure of the shield machine of the present invention is applied to hard ground conditions rich in gravel, large in water content and high in water pressure, and comprises a primary spiral structure 1, a connecting ball bearing 2, a secondary spiral structure 3, and a secondary spiral guide rail device 4. Figure 1 As shown. The primary spiral structure 1 is responsible for initially conveying the slag from the front shield bin 8 to the secondary spiral structure 3, which is then responsible for re-transporting the slag to the rear assembly of the belt conveyor. When slag conveying begins, the secondary screw shaft 301 of the secondary spiral structure 3 starts rotating under the drive of the secondary drive mechanism 304, and then the primary screw shaft 101 of the primary spiral structure 1 restarts rotation under the drive of the primary drive mechanism 111. When slag conveying stops, the primary spiral structure 1 stops rotating under the drive of the primary drive mechanism 111, and then the secondary spiral structure 3 stops rotating under the drive of the secondary drive mechanism 304. This structure has a telescopic function. During the excavation process, under the action of the telescopic cylinder 106 of the first-level spiral structure 1, the first-level screw shaft 101 can realize the reciprocating movement of "extending into the front shield soil bin 8-retracting the fixed section 102", thereby achieving the effect of dredging gravel and slag; at the same time, the second-level spiral structure 3 also slides back and forth along the second-level guide rail device 4 under the action of the telescopic cylinder 106, thereby realizing the telescopic function in the double-helix state.

[0029] The retractable double-screw conveyor structure of the shield machine of the present invention, on the one hand, lengthens the screw conveyor and reduces water pressure, which can effectively prevent gushing and is conducive to adapting to geological conditions with large water content and high water pressure; on the other hand, the primary and secondary spiral structures can be retracted and extended at the same time, which is conducive to unblocking slag and preventing jamming during excavation, and can meet the excavation needs of gravel-containing and locally hard rock formations.

[0030] The above embodiments of the present invention are merely illustrative and not exclusive, and all modifications within the scope of the present invention or equivalent to the scope of the present invention are encompassed by the present invention.

Claims

1. A telescopic double-screw conveyor structure for a shield machine, characterized by: The invention comprises a primary spiral structure (1), a connecting ball bearing (2), a secondary spiral structure (3), and a secondary spiral guide rail device (4). The primary spiral structure (1) comprises a primary screw shaft (101), a fixed section (102), an intermediate section (103), a telescopic inner section (104), a telescopic oil cylinder (106), a front telescopic outer section (107), a rear telescopic outer section (109), a primary driving mechanism (111), and a hoisting mechanism (115); the primary screw shaft (101) The fixed section (102), the intermediate section (103), and the telescopic inner section (104) are connected in sequence. The telescopic inner section (104) is placed in the front telescopic outer section (107). One end of the rear telescopic outer section (109) is connected to the front telescopic outer section (107), and the other end is connected to the outer ring of the primary drive mechanism (111). The telescopic oil cylinder (106) is arranged on the intermediate section (103), and its piston rod is connected to the front telescopic outer section (107) and can drive the front telescopic outer section (107) and the rear telescopic outer section (111). The telescopic outer section (109) performs telescopic motion relative to the telescopic inner section (104); the secondary spiral structure (3) includes a secondary screw machine shaft (301), a secondary front section (302), a secondary rear section (303) and a secondary driving mechanism (304); the fixed section (102) of the primary spiral structure (1) is fixed to the equipment bridge (7) through the front shield screw machine seat (5), and the secondary spiral structure (3) is connected to the equipment bridge (7) through the secondary spiral guide rail device (4); the secondary spiral structure (3) and the primary spiral structure (1) are connected through the connecting ball bearing (2) provided on the secondary front section (302) and the rear telescopic outer section (109); when the telescopic oil cylinder (106) is actuated, the secondary spiral structure (3) and the telescopic outer section (109) subsequently move on the secondary spiral guide rail device (4); a belt conveyor tail assembly structure (6) is provided below the secondary spiral structure (3) for conveying the debris dropped by the entire double spiral conveyor.

2. The telescopic double-screw conveyor structure of a shield machine according to claim 1, characterized in that: The first-stage spiral structure (1) further comprises a guide sleeve (105), a sealing mounting ring (108), a slag discharge door (110) and a soil pressure sensor (114). The first-stage screw shaft (101) is placed inside a cylinder connected by a fixed section (102), an intermediate section (103), a telescopic inner section (104), a front telescopic outer section (107) and a rear telescopic outer section (109). The end thereof is connected to the inner ring of a first-stage driving mechanism (111). The first-stage driving mechanism (111) drives the first-stage screw shaft (101) to rotate and transport slag. The fixed section (102) and the rear telescopic outer section (109) are both equipped with a soil pressure sensor (114) to monitor the water and soil pressure in the cylinder in real time. The slag discharge door (110) is installed at the bottom of the rear telescopic outer section (109).

3. The telescopic double-screw conveyor structure of a shield machine according to claim 1, characterized in that: A guide sleeve (105) is provided between the telescopic inner section (104) and the front telescopic outer section (107), and plays a guiding and anti-twist role when the telescopic oil cylinder (106) is extended or retracted; a sealing mounting ring (108) is provided between the telescopic inner section (104) and the front telescopic outer section (107), and plays a sealing and anti-leakage role when the telescopic oil cylinder (106) is extended or retracted.

4. The telescopic double-screw conveyor structure of a shield machine according to claim 1, characterized in that: The primary spiral structure (1) further comprises a pull-out window (112) and a manual observation window (113), wherein the pull-out window (112) is arranged on both sides of the fixed section (102), and the middle section (103) and the rear telescopic outer section (109) are respectively equipped with a manual observation window (113).

5. The telescopic double-screw conveyor structure of a shield machine according to claim 1, characterized in that: The connecting ball bearing (2) comprises an embedded cylindrical section (201), a spherical bearing (202) and a bottom flange (203), wherein the embedded cylindrical section (201) is embedded in the inner ring of the spherical bearing (202) and connected to the primary spiral structure (1), and the bottom flange (203) is mounted on the outer ring of the spherical bearing (202) and connected to the secondary spiral structure (3), so that the primary and secondary spiral structures can rotate and swing relative to each other, thereby facilitating turning and climbing during equipment construction.

6. The telescopic double-screw conveyor structure of a shield machine according to claim 1, characterized in that: The secondary spiral structure (3) further comprises a second slag discharge door (305), a blocking plate (306), a water collecting bucket (307), a second soil pressure sensor (308) and a drainage pipe (310). One end of the secondary front end section (302) is provided with a blocking plate (306), and the other end is connected to the secondary rear end section (303). The outer ring of the secondary driving mechanism (304) is fixed to the secondary rear end section (303). The secondary screw shaft (301) is placed inside the cylinder of the secondary front end section (302) and the secondary rear end section (303), and one end is fixed to the inner ring of the secondary driving mechanism (304). Under the drive of the secondary driving mechanism (304), the secondary screw shaft (301) rotates to transport slag. The second slag discharge door (305) is installed at the bottom of the secondary rear end section (303) and docks with the tail assembly of the belt conveyor to discharge slag. The second soil pressure sensor (308) is provided on the secondary front end section (302) of the secondary spiral structure (3) to monitor the water and soil pressure in the cylinder in real time.

7. The telescopic double-screw conveyor structure of the shield machine according to claim 6 is characterized in that: A water collecting bucket (307) is provided at the bottom of the secondary front end section (302). When the water content in the cylinder is large, the water can flow into the water collecting bucket (307). A drainage pipe (310) is provided on the side of the water collecting bucket (307) to drain the water in the water collecting bucket (307). A manual observation window (2) (311) is provided at the bottom of the water collecting bucket (307) to facilitate the detection of jamming and blockage in the water collecting bucket (307).

8. The telescopic double-screw conveyor structure of the shield machine according to claim 1 is characterized in that: The secondary spiral structure (3) further includes a second pull-out window (309), which is arranged on the side of the secondary front end section (302), making it easy to detect jams and blockages in the cylinder during construction and facilitate unblocking.

9. The telescopic double-screw conveyor structure of a shield machine according to claim 1 is characterized in that: The secondary spiral guide rail device (4) is a bilaterally symmetrical structure, comprising a support seat (401), a roller (402), a track (403), a support 1 (404), a support 2 (405), a support 3 (406), a support 4 (407) and a support 5 (408). The support seat (401) is welded and fixed to the secondary rear end section (303) of the secondary spiral structure (3). The track (403) is connected to the support 1 (404), the support 2 (405), the support 3 (406), the support 4 (407) and the support 5 (408). Support three (406), support four (407), and support five (408) are fixed on the equipment bridge (7). One end of the roller (402) is fixed to the support seat (401) by a connecting bolt, and the other end is embedded in the groove of the track (403) with a gap. Under the drive of the telescopic oil cylinder (106) of the primary spiral structure (1), the roller (402) rolls back and forth in the track, realizing the telescopic movement of the secondary spiral structure (3) along the track direction of the secondary spiral guide rail device (4).

10. The telescopic double-screw conveyor structure of a shield machine according to any one of claims 1 to 9, characterized in that: The hoisting mechanism (115) is an adjustable pull rod mechanism, one end of the pull rod seat is fixed to the main drive box, and the other end of the pull rod seat is welded to the intermediate section (103). When the primary spiral structure (1) is hoisted, the inclination angle of the primary spiral structure (1) can be fine-tuned.

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