A pipe jacking machine with good excavation effect and working method thereof

Abstract

The invention relates to a pipe jacking machine with good excavation effect and a working method thereof. The pipe jacking machine with good excavation effect comprises a first jacking pipe and a second jacking pipe, the first jacking pipe and the second jacking pipe are movably connected, a excavation mechanism is arranged inside the first jacking pipe, a telescopic pipe section is fixed to one end of the second jacking pipe away from the first jacking pipe, an auxiliary pipe section is arranged at one end of the telescopic pipe section, a pipe jacking mechanism is arranged on one side of the auxiliary pipe section, and a conveying mechanism is arranged inside the first jacking pipe; the excavation mechanism comprises a driving shaft movably connected inside the first jacking pipe, and a driving assembly is arranged outside the driving shaft; the problems in the prior art that a cutting assembly is fixed inside the pipe jacking machine and is difficult to be extended and retracted, and a cutting knife is easily damaged in complex working conditions such as hard stones, affecting the construction progress of the pipe jacking machine, and the excavation efficiency is low because the cutting assembly remains stationary and the soil is only excavated by rotation.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe jacking machines, in particular to a pipe jacking machine with good excavation effect and a working method thereof. Background Art

[0002] The prior art discloses a pipe jacking machine (publication number: CN111520537A), which includes a moving pipe, a fixed ring mounted on the moving pipe, at least two lifting devices, and a cutting assembly mounted on the moving pipe; the cutting assembly includes a cutting motor connected to the moving pipe and a cutting tool mounted on the output shaft of the cutting motor. When the moving pipe deflects during movement, some of the lifting devices are selected to operate, and the output ends of the lifting devices extend to press against the pipe. When the lifting devices press against the pipe, they are subjected to a reaction force from the pipe. Since the lifting devices are mounted on the fixed ring, i.e., the moving pipe, the moving pipe is subjected to the reaction force from the pipe. Since there are two or more lifting devices, different lifting devices are selected according to the direction in which the moving pipe deviates from a preset route. The reaction force exerted by the pipe causes the moving pipe to deflect back toward the preset route, thereby correcting the deviation of the moving pipe from the preset direction and allowing the moving pipe to move along the preset route.

[0003] In the above technology, since the cutting assembly is fixed inside the pipe jacking machine and is difficult to extend and retract, it is easy to cause damage to the cutting knife when encountering complex working conditions such as hard stones, affecting the construction progress of the pipe jacking machine project. In addition, since the cutting assembly remains stationary, the soil is excavated only by rotation, and the excavation efficiency is low.

[0004] In order to solve the above-mentioned defects, a technical solution is now provided. Summary of the Invention

[0005] The purpose of the present invention is to provide a pipe jacking machine with good excavation effect and a working method thereof.

[0006] The technical problems to be solved by the present invention are as follows:

[0007] In the existing technology, since the cutting assembly is fixed inside the pipe jacking machine and is difficult to extend and retract, it is easy to cause damage to the cutting blade when encountering complex working conditions such as hard stones, affecting the construction progress of the pipe jacking machine project. In addition, since the cutting assembly remains stationary, the soil is only excavated by rotation, and the excavation efficiency is low.

[0008] The purpose of the present invention can be achieved through the following technical solutions:

[0009] A pipe jacking machine with good excavation effect includes a first jacking pipe and a second jacking pipe, the first jacking pipe and the second jacking pipe being movably connected, a tunneling mechanism being provided inside the first jacking pipe, a telescopic pipe section being fixed to an end of the second jacking pipe away from the first jacking pipe, an auxiliary pipe section being provided at one end of the telescopic pipe section, a pipe jacking mechanism being provided on one side of the auxiliary pipe section, and a conveying mechanism being provided inside the first jacking pipe;

[0010] The tunneling mechanism includes a driving shaft movably connected to the inside of the first jacking tube, a driving assembly is provided on the outside of the driving shaft, a driving disc is fixed at one end of the driving shaft, a crushing tip is fixed at the middle of the side of the driving disc away from the driving shaft, a sliding sleeve is provided on the outside of the driving shaft, a plurality of connecting plates are fixed on the outer surface of the sliding sleeve, a tunneling knife is fixed at the end of the connecting plate, the tunneling knife is slidably connected to the driving disc, a telescopic shaft is slidably connected inside the driving shaft, a sliding groove is provided on the surface of the driving shaft, the sliding sleeve is fixed to the telescopic shaft through the sliding groove, one end of the telescopic shaft is movably connected to the movable sleeve, a first adjusting cylinder is hingedly connected to one end of the movable sleeve and the first jacking tube, the other end of the movable sleeve is hingedly connected to a connecting rod, one end of the connecting rod is fixed to the first jacking tube, a rotating sleeve is rotatably connected to the outside of the driving shaft, a second adjusting cylinder is symmetrically fixed in the first jacking tube, and the output end of the second adjusting cylinder is fixed to the rotating sleeve.

[0011] Furthermore, the drive assembly includes a first gear fixed to the outside of the drive shaft, a drive motor is fixed in the first jacking tube, a second gear is fixed to the output end of the drive motor, the thickness of the first gear is smaller than the thickness of the second gear and the first gear is meshed with the second gear.

[0012] Furthermore, a movable groove is provided in the movable sleeve, and one end of the telescopic shaft is located in the movable groove and is fixed with a limit plate.

[0013] Furthermore, a plurality of feed ports are provided through the surface of the driving disk, a plurality of telescopic slots are provided on the surface of the driving disk, a plurality of excavation knives pass through the telescopic slots and are slidably connected to the driving disk, and a plurality of feed ports are connected to the corresponding telescopic slots.

[0014] Furthermore, a plurality of turning cylinders are fixed to the inner wall of the second jacking tube, and the output ends of the turning cylinders are hingedly connected to turning rods, and one end of the turning rod is hingedly connected to the first jacking tube.

[0015] Furthermore, the telescopic pipe section includes two symmetrically distributed connecting pipe sections, a number of sliding rods are provided between the two connecting pipe sections, and the number of sliding rods are slidingly connected to the two connecting pipe sections. A number of telescopic cylinders are fixed to the side surface of one of the connecting pipe sections, and the output shaft of the telescopic cylinder is fixed to the side surface of the other connecting pipe section. The number of sliding rods and the number of telescopic cylinders are distributed in a circular array.

[0016] Furthermore, the pipe jacking mechanism includes a pipe jacking seat, a guide rod is fixed on one side of the pipe jacking seat, a pipe jacking plate is slidably connected to the outer side of the guide rod, pipe jacking columns are fixed on both sides of the pipe jacking plate, the two pipe jacking columns are respectively in contact with the side surfaces of the auxiliary pipe section, and a pipe jacking cylinder is symmetrically fixed on one side of the pipe jacking seat, and the output end of the pipe jacking cylinder is fixed to the pipe jacking plate.

[0017] Furthermore, the conveying mechanism includes a conveying chamber, which is located at one end of the inner surface of the first jacking tube away from the second jacking tube. The conveying chamber is rotatably connected to the drive shaft. A conveying pipe is provided on one side of the conveying chamber. A conveying motor is fixed to one end of the conveying pipe. A spiral shaft is fixed to the output end of the conveying motor. A discharge port is provided at the bottom of one end of the conveying pipe, and a conveying trolley is provided in the telescopic pipe section.

[0018] A working method of a pipe jacking machine with good excavation effect comprises the following steps:

[0019] Step 1: After the pipe jacking machine is installed at the construction site, the second gear is driven to rotate by the driving motor, thereby driving the first gear meshed with it to rotate, so that the driving shaft cooperates with the sliding sleeve to drive the tunneling cutter to rotate and excavate the soil. The telescopic shaft can be driven to extend and retract in the driving shaft by the first adjusting cylinder in cooperation with the movable sleeve, thereby controlling the tunneling cutter to extend and retract in the telescopic slot. The driving shaft can be driven to extend and retract in the first jacking pipe by the second adjusting cylinder in cooperation with the rotating sleeve. When encountering stones or hard objects that are difficult to excavate, the tunneling cutter is controlled to retract and the crushing tip is controlled to extend to crush the hard objects. Several turning cylinders cooperate with the turning rod to drive the first jacking pipe to rotate on the surface of the second jacking pipe, thereby changing the inclination angle of the crushing tip and the tunneling cutter.

[0020] Step 2: After the soil is excavated by the excavation mechanism, the telescopic cylinder controls the connecting pipe section near one end of the excavation mechanism to move forward, and a new auxiliary pipe section is added. The auxiliary pipe section is pushed forward by the jacking cylinder to push another connecting pipe section forward, thereby increasing the excavation length and moving forward;

[0021] Step 3: The soil generated during the excavation process of the excavation mechanism enters the conveying chamber through the feed port, and the conveying motor drives the spiral shaft to rotate, and the soil in the conveying chamber is conveyed to the conveying trolley through the conveying pipe, and the soil in the conveying trolley is transferred.

[0022] Beneficial effects of the present invention:

[0023] The present invention provides a tunneling mechanism so that a driving motor drives the second gear to rotate, thereby driving the first gear meshed therewith to rotate, so that the driving shaft cooperates with the sliding sleeve to drive the tunneling cutter to rotate, thereby excavating the soil. The first adjusting cylinder cooperates with the movable sleeve to drive the telescopic shaft to extend and retract in the driving shaft, thereby controlling the tunneling cutter to extend and retract in the telescopic slot. The second adjusting cylinder cooperates with the rotating sleeve to drive the driving shaft to extend and retract in the first jacking pipe. When encountering stones or hard objects that are difficult to excavate, the tunneling cutter is controlled to retract and the crushing tip is controlled to extend. The crushing tip is used to crush the hard objects, thereby avoiding damage to the tunneling cutter and extending the service life of the pipe jacking machine. The pipe jacking machine can adapt to different working conditions and increase the working adaptability of the pipe jacking machine. In addition, the extension and retraction of the crushing tip and the tunneling cutter can also achieve retraction of the pipe jacking machine end during excavation, thereby improving the tunneling effect and efficiency of the pipe jacking machine. A plurality of tilting cylinders cooperate with the tilting rod to drive the first jacking pipe to rotate on the surface of the second jacking pipe, thereby changing the inclination angle of the crushing tip and the tunneling cutter, further improving the tunneling efficiency of the pipe jacking machine.

[0024] By setting up a jacking mechanism and a telescopic pipe section, after the soil is excavated by the excavation mechanism, the telescopic cylinder controls the connecting pipe section near one end of the excavation mechanism to advance forward, and the jacking cylinder then advances the other connecting pipe section forward through the auxiliary pipe section, and adds a new auxiliary pipe section to increase the excavation length, thereby forming a connection between the two pipe wells, so that the components on both sides of the telescopic pipe section are advanced in turn, which not only reduces the resistance to the advancement of the first jacking pipe, but also improves the construction efficiency of the jacking machine. The sliding rod and guide rod set can guide and limit the forward direction of the jacking machine to ensure the accuracy of the forward direction of the jacking machine.

[0025] By setting up a conveying mechanism, the soil generated during the excavation process of the tunneling mechanism enters the conveying chamber through the feed port, and the spiral shaft is driven by the conveying motor to rotate, and the soil in the conveying chamber is transported to the conveying trolley through the conveying pipe, and the soil in the conveying trolley is transferred to ensure the stable excavation efficiency of the excavation surface in front of the pipe jacking machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Figure 1 This is a structural diagram of a pipe jacking machine with good excavation effect according to the present invention;

[0028] Figure 2 It is a structural schematic diagram of the excavation mechanism of the present invention;

[0029] Figure 3 It is a structural side view of the drive disc of the present invention;

[0030] Figure 4 It is a schematic diagram of the internal structure of the movable sleeve of the present invention;

[0031] Figure 5 This invention Figure 2 A magnified view of the structure at point A;

[0032] Figure 6 It is a schematic structural diagram of the drive assembly of the present invention;

[0033] Figure 7 is a side sectional view of the telescopic pipe joint of the present invention;

[0034] Figure 8 It is a structural schematic diagram of the pipe jacking mechanism of the present invention;

[0035] Figure 9 is a side view of the top tube plate of the present invention;

[0036] Figure 10 It is a schematic diagram of the internal structure of the delivery pipe of the present invention.

[0037] In the figure: 1, first jacking pipe; 2, second jacking pipe; 3, tunneling mechanism; 4, telescopic pipe section; 5, auxiliary pipe section; 6, jacking mechanism; 7, conveying mechanism; 301, drive shaft; 302, drive assembly; 303, drive disc; 304, crushing tip; 305, sliding sleeve; 306, connecting plate; 307, tunneling knife; 308, telescopic shaft; 309, movable sleeve; 310, first regulating cylinder; 311, connecting rod; 312, rotating sleeve; 313, second regulating cylinder; 314, First gear; 315, driving motor; 316, second gear; 317, movable groove; 318, feeding port; 319, turning cylinder; 320, turning rod; 401, connecting pipe joint; 402, sliding rod; 403, telescopic cylinder; 601, pipe jacking seat; 602, guide rod; 603, pipe jacking plate; 604, pipe jacking column; 605, pipe jacking cylinder; 701, conveying chamber; 702, conveying pipe; 703, conveying motor; 704, screw shaft; 705, discharge port; 706, conveying trolley. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0039] See also Figures 1-10 , the present invention provides a technical solution:

[0040] A pipe jacking machine with good excavation effect includes a first jacking pipe 1 and a second jacking pipe 2. The first jacking pipe 1 is wrapped around the outside of the second jacking pipe 2 and is movably connected to the second jacking pipe 2. A tunneling mechanism 3 is provided inside the first jacking pipe 1. A telescopic pipe section 4 is fixed to the end of the second jacking pipe 2 away from the first jacking pipe 1. An auxiliary pipe section 5 is provided at one end of the telescopic pipe section 4. A jacking mechanism 6 is provided on one side of the auxiliary pipe section 5. A conveying mechanism 7 is provided inside the first jacking pipe 1; the tunneling mechanism 3 is used to excavate the soil. The telescopic pipe section 4 cooperates with the jacking mechanism 6 to continuously add new auxiliary pipe sections 5 at the rear, thereby continuously jacking the soil. The front end of the tunneling mechanism 3 will continuously spray water onto its excavation surface during excavation, so that the soil forms a paste. The paste-like soil will balance the soil pressure and water pressure in front. The conveying mechanism 7 is used to convey the paste-like soil generated by the tunneling mechanism 3.

[0041] The tunneling mechanism 3 includes a drive shaft 301 movably connected to the inside of the first jacking pipe 1, a drive assembly 302 is provided on the outside of the drive shaft 301, a drive disc 303 is fixed to one end of the drive shaft 301, a crushing tip 304 is fixed to the middle of the side of the drive disc 303 away from the drive shaft 301, a sliding sleeve 305 is provided on the outside of the drive shaft 301, a plurality of connecting plates 306 are fixed to the outer surface of the sliding sleeve 305, a tunneling knife 307 is fixed to the end of the connecting plate 306, the tunneling knife 307 is slidably connected to the drive disc 303, a telescopic shaft 308 is slidably connected to the inside of the drive shaft 301, and the drive A sliding groove is provided on the surface of the shaft 301, and the sliding sleeve 305 is fixed to the telescopic shaft 308 through the sliding groove. One end of the telescopic shaft 308 is movably connected to a movable sleeve 309, and a first adjusting cylinder 310 is hingedly connected between one end of the movable sleeve 309 and the first jacking tube 1. The other end of the movable sleeve 309 is hingedly connected to a connecting rod 311, and one end of the connecting rod 311 is fixed to the first jacking tube 1. The outer side of the drive shaft 301 is rotatably connected to a rotating sleeve 312, and a second adjusting cylinder 313 is symmetrically fixed in the first jacking tube 1, and the output end of the second adjusting cylinder 313 is fixed to the rotating sleeve 312.

[0042] The drive assembly 302 includes a first gear 314 fixed to the outside of the drive shaft 301, a drive motor 315 is fixed in the first jacking tube 1, and a second gear 316 is fixed to the output end of the drive motor 315. The thickness of the first gear 314 is less than the thickness of the second gear 316, and the first gear 314 is meshed with the second gear 316.

[0043] A movable groove 317 is defined in the movable sleeve 309 , and one end of the telescopic shaft 308 is located in the movable groove 317 and is fixed with a limit plate.

[0044] The surface of the driving disk 303 is provided with a plurality of feed ports 318 , and the surface of the driving disk 303 is provided with a plurality of telescopic slots. The plurality of excavation blades 307 pass through the telescopic slots and are slidably connected to the driving disk 303 , and the plurality of feed ports 318 are connected to the corresponding telescopic slots.

[0045] A plurality of tilting cylinders 319 are fixed to the inner wall of the second jacking tube 2. The output end of the tilting cylinder 319 is hingedly connected to a tilting rod 320. One end of the tilting rod 320 is hingedly connected to the first jacking tube 1. By setting up the excavation mechanism 3, the drive motor 315 drives the second gear 316 to rotate, thereby driving the first gear 314 meshed with it to rotate, so that the drive shaft 301 cooperates with the sliding sleeve 305 to drive the excavation blade 307 to rotate, thereby excavating the soil. The first regulating cylinder 310 cooperates with the movable sleeve 309 to drive the telescopic shaft 308 to extend and retract within the drive shaft 301, thereby controlling the excavation blade 307 to extend and retract within the telescopic slot. The second regulating cylinder 313 cooperates with the rotating sleeve 312 to drive the drive shaft 301 to extend and retract within the first jacking tube 1. When encountering rocks or hard objects that are difficult to excavate, the excavation blade 307 is controlled to retract. The crushing tip 304 is returned and the extension of the crushing tip 304 is controlled to be extended, and the crushing tip 304 is used to crush hard objects, thereby avoiding damage to the tunneling knife 307, extending the service life of the pipe jacking machine, and enabling the pipe jacking machine to adapt to different working conditions and increasing the working adaptability of the pipe jacking machine. In addition, the extension and retraction of the crushing tip 304 and the tunneling knife 307 can also achieve the retraction of the end of the pipe jacking machine during excavation, thereby improving the tunneling effect and efficiency of the pipe jacking machine. Several flip cylinders 319 cooperate with the flip rod 320 to drive the first jacking pipe 1 to rotate on the surface of the second jacking pipe 2, thereby changing the inclination angle of the crushing tip 304 and the tunneling knife 307, and further improving the tunneling efficiency of the pipe jacking machine.

[0046] The telescopic pipe section 4 includes two symmetrically distributed connecting pipe sections 401, and a number of sliding rods 402 are provided between the two connecting pipe sections 401. The sliding rods 402 are slidably connected to the two connecting pipe sections 401. A number of telescopic cylinders 403 are fixed to the side surface of one of the connecting pipe sections 401, and the output shaft of the telescopic cylinder 403 is fixed to the side surface of the other connecting pipe section 401. The sliding rods 402 and the telescopic cylinders 403 are distributed in a circular array.

[0047] The pipe jacking mechanism 6 includes a pipe jacking seat 601, a guide rod 602 is fixed on one side of the pipe jacking seat 601, and a pipe jacking plate 603 is slidably connected to the outer side of the guide rod 602. Pipe jacking columns 604 are fixed on both sides of the pipe jacking plate 603, and the two pipe jacking columns 604 are respectively in contact with the side surfaces of the auxiliary pipe section 5. A pipe jacking cylinder 605 is symmetrically fixed on one side of the pipe jacking seat 601, and the output end of the pipe jacking cylinder 605 is fixed to the pipe jacking plate 603. By setting up the jacking mechanism 6 and the telescopic pipe section 4, after the soil is excavated by the excavation mechanism 3, the telescopic cylinder 403 controls the connecting pipe section 401 near one end of the excavation mechanism 3 to advance forward, and the jacking cylinder 605 then advances the other connecting pipe section 401 forward through the auxiliary pipe section 5, and adds a new auxiliary pipe section 5 to increase the excavation length, thereby forming a connection between the two pipe wells, so that the components on both sides of the telescopic pipe section 4 are advanced in turn, which not only reduces the resistance to the advancement of the first jacking pipe 1, but also improves the construction efficiency of the jacking machine. The sliding rod 402 and the guide rod 602 set can both guide and limit the forward direction of the jacking machine to ensure the accuracy of the forward direction of the jacking machine.

[0048] The conveying mechanism 7 includes a conveying chamber 701, which is located at the end of the inner surface of the first jacking pipe 1 away from the second jacking pipe 2. The conveying chamber 701 is rotatably connected to the drive shaft 301. A conveying pipe 702 is provided on one side of the conveying chamber 701. A conveying motor 703 is fixed to one end of the conveying pipe 702. A screw shaft 704 is fixed to the output end of the conveying motor 703. A discharge port 705 is provided at the bottom of one end of the conveying pipe 702. A conveying trolley 706 is provided within the telescopic pipe section 4 and is located below the discharge port 705. By providing the conveying mechanism 7, soil generated during the excavation process of the excavation mechanism 3 enters the conveying chamber 701 through the feed port 318. The conveying motor 703 drives the screw shaft 704 to rotate, and the soil in the conveying chamber 701 is conveyed through the conveying pipe 702 to the conveying trolley 706. The soil in the conveying trolley 706 is then transferred, thereby ensuring stable excavation efficiency at the excavation face in front of the pipe jacking machine.

[0049] A working method of a pipe jacking machine with good excavation effect comprises the following steps:

[0050] Step 1: After the pipe jacking machine is installed at the construction site, the second gear 316 is driven to rotate by the driving motor 315, thereby driving the first gear 314 meshed with it to rotate, so that the driving shaft 301 cooperates with the sliding sleeve 305 to drive the tunneling knife 307 to rotate and excavate the soil. The first adjusting cylinder 310 cooperates with the movable sleeve 309 to drive the telescopic shaft 308 to extend and retract in the driving shaft 301, thereby controlling the tunneling knife 307 to extend and retract in the telescopic slot. The second adjusting cylinder 313 cooperates with the rotating sleeve 312 to drive the driving shaft 301 to extend and retract in the first jacking pipe 1. When encountering stones or hard objects that are difficult to excavate, the tunneling knife 307 is controlled to retract and the crushing tip 304 is controlled to extend to crush the hard objects. The plurality of turning cylinders 319 cooperate with the turning rod 320 to drive the first jacking pipe 1 to rotate on the surface of the second jacking pipe 2, thereby changing the inclination angle of the crushing tip 304 and the tunneling knife 307.

[0051] Step 2: After the soil is excavated by the excavation mechanism 3, the telescopic cylinder 403 controls the connecting pipe section 401 near one end of the excavation mechanism 3 to move forward, adding a new auxiliary pipe section 5, and the auxiliary pipe section 5 is pushed forward by the jacking cylinder 605 to push another connecting pipe section 401 forward, thereby increasing the excavation length and moving forward;

[0052] Step 3: The soil generated during the excavation process of the excavation mechanism 3 enters the conveying chamber 701 through the feed port 318, and the screw shaft 704 is driven to rotate by the conveying motor 703 to convey the soil in the conveying chamber 701 through the conveying pipe 702 to the conveying trolley 706, and the soil in the conveying trolley 706 is transferred.

[0053] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A pipe jacking machine with good excavation effect, comprising a first jacking pipe (1) and a second jacking pipe (2), wherein the first jacking pipe (1) and the second jacking pipe (2) are movably connected, and characterized in that: A tunneling mechanism (3) is provided inside the first jacking pipe (1); a telescopic pipe section (4) is fixed to one end of the second jacking pipe (2) away from the first jacking pipe (1); an auxiliary pipe section (5) is provided at one end of the telescopic pipe section (4); a jacking mechanism (6) is provided on one side of the auxiliary pipe section (5); and a conveying mechanism (7) is provided inside the first jacking pipe (1); The tunneling mechanism (3) comprises a driving shaft (301) movably connected to the inside of the first jacking pipe (1); a driving assembly (302) is provided on the outside of the driving shaft (301); a driving disc (303) is fixed to one end of the driving shaft (301); a crushing tip (304) is fixed to the middle of a side of the driving disc (303) away from the driving shaft (301); a sliding sleeve (305) is provided on the outside of the driving shaft (301); a plurality of connecting plates (306) are fixed to the outer surface of the sliding sleeve (305); a tunneling knife (307) is fixed to the end of the connecting plate (306); the tunneling knife (307) is slidably connected to the driving disc (303); a telescopic shaft (308) is slidably connected to the inside of the driving shaft (301); A sliding groove is provided on the surface of the driving shaft (301), and the sliding sleeve (305) is fixed to the telescopic shaft (308) via the sliding groove. One end of the telescopic shaft (308) is movably connected to a movable sleeve (309), one end of the movable sleeve (309) and the first jacking tube (1) are hingedly connected to a first regulating cylinder (310), the other end of the movable sleeve (309) is hingedly connected to a connecting rod (311), one end of the connecting rod (311) is fixed to the first jacking tube (1), the outer side of the driving shaft (301) is rotatably connected to a rotating sleeve (312), and a second regulating cylinder (313) is symmetrically fixed in the first jacking tube (1), and the output end of the second regulating cylinder (313) is fixed to the rotating sleeve (312).

2. A pipe jacking machine with good excavation effect according to claim 1, characterized in that: The driving assembly (302) comprises a first gear (314) fixed on the outside of the driving shaft (301), a driving motor (315) is fixed in the first jacking tube (1), a second gear (316) is fixed to the output end of the driving motor (315), the thickness of the first gear (314) is smaller than the thickness of the second gear (316), and the first gear (314) is meshed with the second gear (316).

3. A pipe jacking machine with good excavation effect according to claim 2, characterized in that: A movable groove (317) is provided in the movable sleeve (309), and one end of the telescopic shaft (308) is located in the movable groove (317) and is fixed with a limit plate.

4. A pipe jacking machine with good excavation effect according to claim 3, characterized in that: The surface of the driving disk (303) is provided with a plurality of feed ports (318) extending therethrough, the surface of the driving disk (303) is provided with a plurality of telescopic slots, a plurality of excavation knives (307) pass through the telescopic slots and are slidably connected to the driving disk (303), and the plurality of feed ports (318) are connected to the corresponding telescopic slots.

5. A pipe jacking machine with good excavation effect according to claim 4, characterized in that: A plurality of turning cylinders (319) are fixed to the inner wall of the second jacking tube (2); the output end of the turning cylinder (319) is hingedly connected to a turning rod (320); one end of the turning rod (320) is hingedly connected to the first jacking tube (1).

6. A pipe jacking machine with good excavation effect according to claim 5, characterized in that: The telescopic pipe section (4) comprises two symmetrically distributed connecting pipe sections (401), a plurality of sliding rods (402) are arranged between the two connecting pipe sections (401), the plurality of sliding rods (402) are slidably connected to the two connecting pipe sections (401), a plurality of telescopic cylinders (403) are fixed to the side surface of one of the connecting pipe sections (401), the output shaft of the telescopic cylinder (403) is fixed to the side surface of the other connecting pipe section (401), and the plurality of sliding rods (402) and the plurality of telescopic cylinders (403) are distributed in a ring array.

7. A pipe jacking machine with good excavation effect according to claim 6, characterized in that: The pipe jacking mechanism (6) comprises a pipe jacking seat (601), a guide rod (602) being fixed on one side of the pipe jacking seat (601), a pipe jacking plate (603) being slidably connected to the outer side of the guide rod (602), pipe jacking columns (604) being fixed on both sides of the pipe jacking plate (603), the two pipe jacking columns (604) being in contact with the side surfaces of the auxiliary pipe section (5), and a pipe jacking cylinder (605) being symmetrically fixed on one side of the pipe jacking seat (601), the output end of the pipe jacking cylinder (605) being fixed to the pipe jacking plate (603).

8. A pipe jacking machine with good excavation effect according to claim 7, characterized in that: The conveying mechanism (7) comprises a conveying chamber (701), the conveying chamber (701) being located at one end of the inner surface of the first jacking tube (1) away from the second jacking tube (2), the conveying chamber (701) being rotatably connected to the driving shaft (301), a conveying pipe (702) being provided on one side of the conveying chamber (701), a conveying motor (703) being fixed to one end of the conveying pipe (702), a spiral shaft (704) being fixed to the output end of the conveying motor (703), a discharge port (705) being provided at the bottom of one end of the conveying pipe (702), and a conveying trolley (706) being provided in the telescopic pipe section (4).

9. A working method of a pipe jacking machine with good excavation effect according to claim 8, characterized in that: The steps include: Step 1: After the pipe jacking machine is installed at the construction site, the second gear (316) is driven to rotate by the driving motor (315), thereby driving the first gear (314) meshing with the second gear (316) to rotate, so that the driving shaft (301) cooperates with the sliding sleeve (305) to drive the excavation blade (307) to rotate, and the soil is excavated. The telescopic shaft (308) can be driven to extend and retract in the driving shaft (301) by the first regulating cylinder (310) and the movable sleeve (309), thereby controlling the excavation blade (307) to extend and retract in the telescopic groove. (313) cooperates with the rotating sleeve (312) to drive the driving shaft (301) to achieve extension and retraction in the first jacking tube (1). When encountering stones or hard objects that are difficult to dig, the tunneling knife (307) is controlled to retract and the crushing tip (304) is controlled to extend. The crushing tip (304) is used to crush the hard object. A plurality of turning cylinders (319) cooperate with the turning rod (320) to drive the first jacking tube (1) to rotate on the surface of the second jacking tube (2), thereby changing the inclination angles of the crushing tip (304) and the tunneling knife (307); Step 2: After the soil is excavated by the excavation mechanism (3), the telescopic cylinder (403) controls the connecting pipe section (401) near one end of the excavation mechanism (3) to move forward, a new auxiliary pipe section (5) is added, and the auxiliary pipe section (5) is pushed forward by the jacking cylinder (605) to push another connecting pipe section (401) forward, thereby increasing the excavation length and moving forward; Step 3: The soil generated during the excavation process of the excavation mechanism (3) enters the conveying chamber (701) through the feed port (318), and the conveying motor (703) drives the screw shaft (704) to rotate, so that the soil in the conveying chamber (701) is conveyed to the conveying trolley (706) through the conveying pipe (702), and the soil in the conveying trolley (706) is transferred.

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