Secondary crushing device for rock tube push bench

Abstract

The invention relates to the technical field of rock pipe jacking machines, and discloses a secondary crushing device for a rock pipe jacking machine, which is integrated in a pipe jacking machine conveying system and comprises a double-helix crushing rod, a high-pressure water jet auxiliary module and a dynamic grading screening mechanism. Gravel obtained after primary crushing is oppositely meshed and extruded through the spiral crushing rods to achieve secondary mechanical crushing, meanwhile, a high-pressure water jet pipe is embedded in a spiral shaft, rotary cutting type hydraulic crushing is formed through a directional nozzle, and the particle size of the gravel is stable to be smaller than or equal to 50 mm through the dual effects. And the conveying shell adopts a telescopic modular design, and the crushing mechanism is quickly exposed through the hydraulic supporting rod, so that maintenance and overhaul within 30 minutes are realized, and the whole machine is prevented from being disassembled. The slag discharging opening is provided with the grading screen with the adjustable screen gap, and the turbulent flow pressure loss is effectively reduced by more than 40% in combination with an elastic sealing structure of the slurry flow channel. Complete decoupling of a cutterhead driving system and secondary crushing is achieved, the spiral crushing rotating speed can be independently regulated and controlled, the cutterhead torque fluctuation range is reduced to + / -8%, and the service life of a cutter is prolonged by two times.

Description

Technical Field

[0001] The present invention relates to the technical field of rock pipe jacking machines, and particularly to a secondary crushing device for a rock pipe jacking machine. Background Art

[0002] In the construction of trenchless underground projects, when a slurry pipe jacking machine faces a pebble layer or a rock stratum, there are significant technical bottlenecks: in the traditional single-stage crushing system, since the impact energy of the cutter is transmitted only through a single mechanical structure, it is difficult to dynamically adjust the impact strength according to the rock hardness. When encountering high-strength or large-diameter rock masses, the energy attenuation is significant, resulting in only partial cutting of some pebbles without sufficient crushing. Specifically, the particle size of the rock blocks after primary crushing generally exceeds 80 mm, far exceeding the designed inner diameter of the mud discharge pipeline, which is 50 - 60 mm. This defect causes a chain of problems - large-diameter crushed stones get stuck at the impeller of the mud discharge pump due to inertial collision, and at the same time, local turbulence of the mud flow channel is intensified, increasing the pipeline pressure loss and reducing the flow velocity to below the critical value. Eventually, the construction party has to stop the machine every 2 hours for manual slag cleaning, with a high single-day construction interruption rate, seriously restricting the project efficiency and increasing the tool wear cost.

[0003] Under this background, an integrated secondary crushing device needs to be developed. Currently, most existing secondary crushing devices are integrated on the back of the pipe jacking machine cutter head. The secondary crushing device and the cutter head share a drive system, resulting in limited cutter head rotation speed, inability to independently adjust the crushing parameters, and the cutter head vibration being directly transmitted to the secondary crushing mechanism. The measured amplitude is amplified by 1.8 - 2.5 times, seriously affecting the equipment stability. This not only increases the pressure on the cutter head drive device of the pipe jacking machine, expanding the risk of unstable operation of the pipe jacking machine cutter head, but also is not conducive to the adjustment of the drive torque of the pipe jacking machine cutter head, leading to more serious tool wear of the pipe jacking machine cutter head.

[0004] Therefore, we propose a secondary crushing device for a rock pipe jacking machine to solve the problems in the above background. Summary of the Invention

[0005] The purpose of the present invention is to provide a secondary crushing device for a rock pipe jacking machine to solve the risk problems in the above background art, where most existing secondary crushing devices are integrated on the back of the pipe jacking machine cutter head, the secondary crushing device and the cutter head share a drive system, and it is impossible to independently adjust the crushing parameters, seriously affecting the equipment stability.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: A secondary crushing device for a rock pipe jacking machine, comprising a pipe jacking machine and a conveying system. The conveying system is internally connected to the front end of the pipe jacking machine. A primary crushing mechanism for rock crushing is installed at the front end of the pipe jacking machine. The conveying system is used for conveying the crushed stones after the primary crushing of the pipe jacking machine. The conveying system includes a conveying housing. A secondary crushing mechanism for secondary crushing of the crushed stones is installed inside the conveying housing. The conveying housing is composed of a conveying outer housing and a conveying inner housing. One end of the conveying inner housing is slidably connected inside the conveying outer housing. The end of the conveying inner housing away from the conveying outer housing is guidingly connected to the bottom of the primary crushing mechanism; An adjustable support seat for the conveying outer housing is installed on the inner wall of the pipe jacking machine. A telescopic adjustment assembly is installed between the conveying outer housing and the conveying inner housing.

[0007] Preferably, the primary crushing mechanism includes main bearings installed at both ends of the pipe jacking machine. The main bearing installed at the front end of the pipe jacking machine is used for supporting the cutter head and the drive system. The cutter head is rotatably connected inside the main bearing at the front end of the pipe jacking machine. The drive system drives the cutter head to rotate for primary crushing of the tunnel rock. A support disc is arranged at the position of the main bearing near the front end of the pipe jacking machine. A crushed stone accommodating cavity is arranged between the cutter head and the support disc.

[0008] Preferably, a slag discharge connection seat is fixedly connected to one side of the main bearing close to the inside of the pipe jacking machine. The inside of the slag discharge connection seat is connected to the bottom of the crushed stone accommodating cavity. A positioning hole is arranged at the end of the slag discharge connection seat away from the main bearing.

[0009] Preferably, the secondary crushing mechanism includes spiral crushing rods. There are two spiral crushing rods and they are symmetrically arranged inside the conveying housing. One end of the spiral crushing rod passes through the slag discharge connection seat and enters the bottom of the crushed stone accommodating cavity. The two spiral crushing rods rotate towards each other for secondary crushing of the crushed stones.

[0010] Preferably, a rotating support seat is fixedly installed at the end of the conveying outer housing away from the conveying inner housing. A shaft rod for driving the spiral crushing rod to rotate is arranged inside the spiral crushing rod. The shaft rod at the end of the spiral crushing rod away from the crushed stone accommodating cavity passes through the rotating support seat and is connected with a rotary drive seat. The rotary drive seat cooperates with the drive device to rotate and drive the shaft rod.

[0011] Preferably, the telescopic adjustment assembly is a hydraulic support rod. Linkage seats are fixedly installed on the outer sides of the conveying outer housing and the conveying inner housing respectively. The hydraulic support rod is installed between the two linkage seats.

[0012] Preferably, a guide seat is fixedly connected to the end of the conveying inner housing close to the slag discharge connection seat. A stabilizing pin is fixedly installed inside the guide seat. The stabilizing pin is inserted and matched with the positioning hole on the slag discharge connection seat.

[0013] Preferably, a slag discharging assembly for discharging mud and crushed stones is provided at the bottom of the conveying outer shell. The slag discharging assembly includes a slag discharging port fixedly communicated with the bottom of the conveying outer shell. A closing plate is slidably connected inside the slag discharging port. A first hydraulic telescopic rod is fixedly installed on the conveying outer shell. The telescopic end of the first hydraulic telescopic rod is fixedly connected to one side of the closing plate. The first hydraulic telescopic rod pushes the closing plate to slide for opening or closing the slag discharging port.

[0014] Preferably, an adjustable grading screen is installed obliquely along the conveying direction on the inner side of the slag discharging port. The grading screen includes a plurality of parallel screen bars. One end of each screen bar is movably connected to the side wall of the slag discharging port through a hinge shaft, and the other end is connected to a screen gap adjusting hydraulic cylinder through a linkage rod. The screen gap adjusting hydraulic cylinder is fixed on the outer side wall of the slag discharging port, and the telescopic movement of its piston rod can synchronously change the inclination angle of all screen bars and the distance between adjacent screen bars.

[0015] Preferably, a high-pressure water jet pipe is coaxially nested inside the shaft of the spiral crushing rod. The high-pressure water jet pipe extends to the end of the spiral blade and is provided with a plurality of fan-shaped nozzles. A hydraulically driven water pressure regulating module is integrated on the outer wall of the conveying outer shell. The water pressure regulating module is communicated with the high-pressure water jet pipe through a rotary sealing joint.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The secondary crushing mechanism of the present invention adopts a dual-spiral crushing rod independent drive system, which is mechanically decoupled from the cutter head through a rotary drive seat, and cooperates with a high-pressure water jet pipe embedded in the spiral shaft to form a composite crushing mode of mechanical extrusion and water wedge effect when rotating in opposite directions. This design enables the secondary crushing impact energy to be independently adjusted, avoiding resonance with the cutter head, and the measured vibration amplitude is reduced from 2.5 times of the traditional to less than 0.8 times.

[0017] When the crushed stones after primary crushing enter the double-spiral biting area, the double-spiral blades rotate in opposite directions for shearing and extrusion. At the same time, the high-pressure water jet performs hydraulic splitting on the rock blocks along the spiral trajectory. The dual action reduces the median particle size of the crushed stones after secondary crushing from 80 mm to 28 mm, and 95% of the crushed stone particle size ≤ 30 mm, which completely matches the mud discharge pipe diameter.

[0018] The adjustable grading screen of the slag discharging assembly controls the screen bar spacing in real time through the screen gap adjusting hydraulic cylinder. Combined with the inclination angle of the slag discharging port, the oversize crushed stones are preferentially pushed into the secondary crushing cycle by the spiral, while the qualified mud is quickly discharged through the screen gap. This structure increases the mud flow velocity, reduces the turbulence intensity, and reduces the pipeline pressure loss. The telescopic adjustment assembly drives the inner conveying shell to slide by a multi-stage hydraulic support rod, and cooperates with the plug-in positioning of the guide seat and the stabilizing pin, and can complete the complete exposure and maintenance of the spiral crushing rod within 2 minutes. The combination of the elastic rubber sealing ring and the multi-axis adjustable support seat ensures the dynamic sealing of the conveying shell during the jacking process of the pipe jacking machine.

[0019] The above structure reduces the energy consumption of secondary crushing, while the tool wear rate decreases. Combined with its continuous slag discharge capacity, the construction efficiency is improved compared with the traditional secondary crushing device, and the maintenance time is greatly shortened, completely solving the core problems of pebble layer jamming and insufficient hard rock crushing. Brief Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the overall external structure of the secondary crushing device for the rock pipe jacking machine of the present invention; Figure 2 It is a schematic diagram of the overall side sectional structure of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram of the partial enlarged structure at A; Figure 4 It is a schematic diagram of the internal sectional structure of the conveying system of the present invention; Figure 5 It is a schematic diagram of the connection structure of the slag discharging component on the conveying outer casing of the present invention.

[0021] Wherein: 1, rear seat wall; 2, propulsion mechanism; 3, pipe jacking machine; 4, primary crushing mechanism; 5, conveying system; 6, secondary crushing mechanism; 7, slag discharging component; 41, main bearing; 42, cutter head; 43, slag discharge connecting seat; 51, conveying outer casing; 52, conveying inner casing; 53, telescopic adjustment component; 54, adjustable support seat; 55, guide seat; 56, stabilizing pin; 61, spiral crushing rod; 62, rotating support seat; 63, rotary drive seat; 71, slag discharge port; 72, closing plate; 73, first hydraulic telescopic rod. Detailed Embodiment

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] Embodiment 1: Please refer to Figures 1-5 , the present invention provides a technical solution: A secondary crushing device for a rock pipe jacking machine, including a pipe jacking machine 3 and a conveying system 5. The conveying system 5 is internally connected to the front end of the pipe jacking machine 3. A primary crushing mechanism 4 for rock crushing is installed at the front end of the pipe jacking machine 3. The conveying system 5 is used for conveying the crushed stones after the primary crushing by the pipe jacking machine 3. The conveying system 5 includes a conveying housing, and a secondary crushing mechanism 6 for secondary crushing of the crushed stones is installed inside the conveying housing. The conveying housing is composed of a conveying outer housing 51 and a conveying inner housing 52. One end of the conveying inner housing 52 is slidably connected inside the conveying outer housing 51, and there is a sliding seal between the conveying outer housing 51 and the conveying inner housing 52. The gap between the conveying outer housing 51 and the conveying inner housing 52 can be elastically sealed by an elastic rubber to prevent leakage when the conveying housing conveys mud and crushed stones. The end of the conveying inner housing 52 far from the conveying outer housing 51 is guidingly connected to the bottom of the primary crushing mechanism 4. After the primary crushing mechanism 4 crushes the tunnel rock formation, the rock blocks will fall to the bottom of the primary crushing mechanism 4. Through the guiding connection between the conveying inner housing 52 and the bottom of the primary crushing mechanism 4, it is beneficial to output the crushed stones and mud, ensuring the stable crushing and drilling work of the primary crushing mechanism 4.

[0024] An adjustable support seat 54 for the conveying outer housing 51 is installed on the inner wall of the pipe jacking machine 3. The adjustable support seat 54 supports one end of the conveying outer housing 51. The adjustable support seat 54 is similar to a multi-axis robotic arm mechanism and can adjust the support of the conveying outer housing 51, facilitating the installation and position adjustment of the conveying outer housing 51. A telescopic adjustment component 53 is installed between the conveying outer housing 51 and the conveying inner housing 52. The telescopic adjustment component 53 pushes the conveying inner housing 52 to extend or contract outward from the conveying outer housing 51. When the conveying inner housing 52 contracts into the conveying outer housing 51, the end of the secondary crushing mechanism 6 close to the primary crushing mechanism 4 is exposed, which is beneficial for cleaning or maintenance.

[0025] Furthermore, the primary crushing mechanism 4 includes main bearings 41 installed at both ends of the pipe jacking machine 3. The main bearing 41 installed at the front end of the pipe jacking machine 3 is used for supporting the cutter head 42 and the drive system. The cutter head 42 is rotatably connected inside the main bearing 41 at the front end of the pipe jacking machine 3. The drive system drives the cutter head 42 to rotate for primary crushing of the tunnel rock. A support disk is arranged at the position of the main bearing 41 near the front end of the pipe jacking machine 3. A crushed stone accommodating cavity is arranged between the cutter head 42 and the support disk. The main bearing 41 installed at the rear end of the pipe jacking machine 3 is used for connecting with the propulsion mechanism 2 of the pipe jacking machine 3. One end of the propulsion mechanism 2 far from the pipe jacking machine 3 is provided with a rear seat wall 1, and the basic support is fixed through the rear seat wall 1. The propulsion mechanism 2 pushes the pipe jacking machine 3 to drive forward.

[0026] Further, one side of the main bearing 41 close to the inside of the pipe jacking machine 3 is fixedly communicated with a slag discharge connection seat 43. The inside of the slag discharge connection seat 43 is communicated with the bottom of the gravel accommodating cavity. The cutter head 42 rotates to break and peel off the rock in the advancing direction. The rock fragments enter the gravel accommodating cavity and fall to its bottom under the action of gravity. During the rotation and crushing of the cutter head 42, the cutter head 42 is cooled by spraying water, and at the same time, the function of dust reduction is achieved. The gravel and dust are mixed with the water flow to form slurry. The conveying inner shell 52 is communicated with the slag discharge connection seat 43, so that the slurry and gravel blocks at the bottom of the gravel accommodating cavity are discharged by the conveying system 5, preventing the accumulation and blockage inside the gravel accommodating cavity and affecting the operation of the primary crushing mechanism 4. The secondary crushing mechanism 6 includes spiral crushing rods 61. There are two spiral crushing rods 61, which are symmetrically arranged inside the conveying shell. One end of the spiral crushing rod 61 passes through the slag discharge connection seat 43 and enters the bottom of the gravel accommodating cavity. The two symmetrically arranged spiral crushing rods 61 enter the bottom of the gravel accommodating cavity. Through their special spiral structure, when the two spiral crushing rods 61 rotate towards each other, a unidirectional pushing effect on the slurry and gravel is realized, so that they enter the inside of the conveying shell and are continuously conveyed and discharged outwards. The two spiral crushing rods 61 rotate towards each other, and the spiral blades on the spiral crushing rods 61 engage with each other during rotation, squeezing the gravel. The spiral blades of the spiral crushing rod 61 are cast with a thicker high-strength steel material. The spiral crushing rod 61 is used for effective secondary crushing of the gravel, and at the same time, its special spiral structure is used to convey the gravel and slurry.

[0027] Further, a rotating support seat 62 is fixedly installed at one end of the conveying outer shell 51 away from the conveying inner shell 52. A shaft rod for driving the rotation of the spiral crushing rod 61 is arranged inside the spiral crushing rod 61. The shaft rod at the end of the spiral crushing rod 61 away from the gravel accommodating cavity passes through the rotating support seat 62 and is connected with a rotary drive seat 63. The rotating support seat 62 supports the rotation of the shaft rod to keep it stable. The rotary drive seat 63 cooperates with the drive device to rotate and drive the shaft rod. The drive device can be composed of two drive motors, or can be composed of a double-shaft gearbox and a motor connection. The two output ends of the double-shaft gearbox drive the two spiral crushing rods 61 to rotate towards each other.

[0028] Further, the telescopic adjustment assembly 53 is a hydraulic support rod. The hydraulic support rod expands and contracts through hydraulic drive. Linking seats are fixedly installed on the outer sides of the conveying outer shell 51 and the conveying inner shell 52 respectively. The hydraulic support rod is installed between the two linking seats. The conveying outer shell 51 is kept stable through the adjustable support seat 54. When the hydraulic support rod expands and contracts, it drives the conveying inner shell 52 to extend out of the conveying outer shell 51 or contract inside the conveying outer shell 51.

[0029] Further, one end of the conveying inner housing 52 close to the slag discharge connecting seat 43 is fixedly connected with a guiding seat 55. A stabilizing pin 56 is fixedly installed inside the guiding seat 55. A positioning hole is provided at one end of the slag discharge connecting seat 43 away from the main bearing 41. The stabilizing pin 56 is inserted and matched with the positioning hole on the slag discharge connecting seat 43. When the conveying inner housing 52 extends outwards, the guiding seat 55 approaches the slag discharge connecting seat 43, and the stabilizing pin 56 on the guiding seat 55 is inserted into the positioning hole of the slag discharge connecting seat 43. The hydraulic support rod pushes the guiding seat 55 of the conveying inner housing 52 to be clamped with the slag discharge connecting seat 43. The insertion of the stabilizing pin 56 into the positioning hole is used to prevent the misalignment of the connection between the guiding seat 55 and the slag discharge connecting seat 43. At this time, one end of the conveying housing is supported by the adjustable support seat 54, and the connection between the guiding seat 55 and the slag discharge connecting seat 43 keeps the other end of the conveying housing stable, ensuring the stable operation of the conveying system 5.

[0030] Further, a slag discharging assembly 7 for discharging slurry and crushed stones is provided at the bottom of the conveying outer housing 51. The slag discharging assembly 7 includes a slag discharge port 71 fixedly communicated with the bottom of the conveying outer housing 51. A closing plate 72 is slidably connected inside the slag discharge port 71. A first hydraulic telescopic rod 73 is fixedly installed on the conveying outer housing 51. The telescopic end of the first hydraulic telescopic rod 73 is fixedly connected with one side of the closing plate 72. The first hydraulic telescopic rod 73 pushes the closing plate 72 to slide for opening or closing the slag discharge port 71. An adjustable grading screen is inclinedly installed along the conveying direction inside the slag discharge port 71. The grading screen includes a number of parallel screen bars. One end of each screen bar is movably connected to the side wall of the slag discharge port 71 through a hinge shaft, and the other end is connected to a screen gap adjusting hydraulic cylinder through a linkage rod; the screen gap adjusting hydraulic cylinder is fixed on the outer side wall of the slag discharge port 71, and the telescopic movement of its piston rod can synchronously change the inclination angle of all screen bars and the distance between adjacent screen bars to realize the dynamic grading discharge of crushed stones with different particle sizes.

[0031] Further, a high-pressure water jet pipe is coaxially nested inside the shaft of the spiral crushing rod 61. The high-pressure water jet pipe extends to the end of the spiral blade and is provided with a number of fan-shaped nozzles; a hydraulically driven water pressure regulating module is integrated on the outer wall of the conveying outer housing 51. The water pressure regulating module is communicated with the high-pressure water jet pipe through a rotary seal joint. The jet direction of the nozzles forms an angle of 20° - 40° with the spiral direction of the spiral blade, forming a rotary cutting type hydraulic assisted crushing structure for the crushed stone layer.

[0032] The working principle and effect of the secondary crushing device for the rock pipe jacking machine 3 are as follows: The rear seat wall 1 provides a fixed support for the propulsion mechanism 2. When the propulsion mechanism 2 drives the pipe jacking machine 3 to advance forward, the cutter head 42 at the front end of the primary crushing mechanism 4 rotates at high speed under the support of the main bearing 41 to perform primary crushing on the rock formation; the crushed stones are mixed with the sprayed water flow to form slurry, which enters the slag discharge connecting seat 43 through the bottom of the crushed stone accommodating cavity. At this time, the conveying inner shell 52 of the conveying system 5 is accurately inserted into the positioning hole of the slag discharge connecting seat 43 through the stabilizing pin 56 of the guiding seat 55, and the telescopic adjustment assembly 53 pushes the conveying inner shell 52 to extend out of the outer shell to form a continuous conveying channel. The two spiral crushing rods 61 of the secondary crushing mechanism 6 rotate towards each other under the drive of the rotary drive seat 63, and their spiral blades bite each other to squeeze and crush the crushed stones. At the same time, the spiral structure conveys the material towards the slag discharge port 71 to avoid the problem of large-diameter crushed stones entering the inside of the conveying shell and causing blockage. When the crushed stones are completely crushed and enter the inside of the conveying shell, resulting in blockage, the hydraulic support rod of the telescopic adjustment assembly 53 drives the conveying inner shell 52 to contract towards the inside of the outer shell, and the guiding seat 55 is separated from the slag discharge connecting seat 43 to expose the two spiral crushing rods 61 for quickly cleaning the crushed stones stuck between the spiral crushing rods 61. The operation is convenient and fast, saving maintenance time and maintenance costs, and improving the working efficiency of the rock pipe jacking machine 3.

[0033] During the conveying process, the high-pressure water jet pipe inside the shaft of the spiral crushing rod 61 directionally sprays high-pressure water flow through the sector nozzles. The water flow forms an angle of 20° - 40° with the spiral direction of the spiral blade to perform rotary cutting and auxiliary crushing on hard rock, while reducing the wear of the spiral blade and forming lubricating slurry. In the slag discharge assembly 7 arranged at the bottom of the conveying outer shell 51, the adjustable grading screen dynamically adjusts the spacing between the screen bars through the screen gap adjusting hydraulic cylinder to achieve the graded discharge of crushed stones with different particle sizes; when the hydraulic telescopic rod 73 pushes the closing plate 72 to open the slag discharge port 71, the slurry and the crushed stones are discharged in layers according to the particle size to avoid pipeline blockage. In addition, the sliding joint part between the conveying inner shell 52 and the outer shell adopts an elastic rubber seal, combined with the multi-axis robotic arm adjustment function of the adjustable support seat 54, to ensure the dynamic seal and stability of the conveying system 5 during the advancement of the pipe jacking machine 3.

[0034] This device significantly improves the hard rock crushing efficiency through a triple collaborative mechanism of primary mechanical crushing, secondary hydraulic coupling crushing, and dynamic graded slag discharge. The measured uniformity of the crushed stone particle size is increased by 40%. At the same time, through the adaptive adjustment of the sealing structure, the service life of key components is extended by more than 2 times. The telescopic adjustment assembly 53 drives the sliding cooperation between the conveying outer shell 51 and the conveying inner shell 52, and the guiding seat 55 is stably docked with the slag discharge connecting seat 43 through the stabilizing pin 56 to achieve the rapid closing and opening of the outside of the secondary crushing mechanism 6. When closed, it is used for the double spiral crushing rod 61 to crush and stably convey the rock. When opened, it is beneficial for the rapid cleaning and maintenance of the double spiral crushing rod 61.

[0035] Although specific embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these specific embodiments without departing from the principles and spirit of the invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A secondary crushing device for a rock pipe jacking machine, comprising a pipe jacking machine (3) and a conveying system (5). The conveying system (5) is internally communicated with the front end of the pipe jacking machine (3). A primary crushing mechanism (4) for rock crushing is installed at the front end of the pipe jacking machine (3). The conveying system (5) is used for conveying the crushed stones after the primary crushing by the pipe jacking machine (3). It is characterized in that: The conveying system (5) includes a conveying housing, inside which a secondary crushing mechanism (6) for secondary crushing of crushed stones is installed. The conveying housing is composed of a conveying outer housing (51) and a conveying inner housing (52). One end of the conveying inner housing (52) is slidably connected inside the conveying outer housing (51), and the end of the conveying inner housing (52) away from the conveying outer housing (51) is in guiding communication with the bottom of the primary crushing mechanism (4); on the inner wall of the pipe jacking machine (3), an adjustable support seat (54) for the conveying outer housing (51) is installed, and a telescopic adjustment assembly (53) is installed between the conveying outer housing (51) and the conveying inner housing (52).

2. The secondary crushing device for a rock pipe jacking machine according to claim 1, characterized in that: The primary crushing mechanism (4) includes main bearings (41) installed at both ends of the pipe jacking machine (3). The main bearing (41) installed at the front end of the pipe jacking machine (3) is used for supporting the cutter head (42) and the drive system. The cutter head (42) is rotatably connected inside the main bearing (41) at the front end of the pipe jacking machine (3). The drive system drives the cutter head (42) to rotate to perform primary crushing on the tunnel rock. A support disc is arranged at the position of the main bearing (41) near the front end of the pipe jacking machine (3), and a crushed stone accommodating cavity is arranged between the cutter head (42) and the support disc.

3. The secondary crushing device for a rock pipe jacking machine according to claim 2, characterized in that: On one side of the main bearing (41) close to the inside of the pipe jacking machine (3), a slag discharge connecting seat (43) is fixedly communicated. The inside of the slag discharge connecting seat (43) is communicated with the bottom of the crushed stone accommodating cavity, and a positioning hole is arranged at the end of the slag discharge connecting seat (43) away from the main bearing (41).

4. The secondary crushing device for a rock pipe jacking machine according to claim 3, characterized in that: The secondary crushing mechanism (6) includes spiral crushing rods (61). There are two spiral crushing rods (61) which are symmetrically arranged inside the conveying housing. One end of the spiral crushing rod (61) passes through the slag discharge connecting seat (43) and enters the bottom of the crushed stone accommodating cavity. The two spiral crushing rods (61) rotate towards each other to perform secondary crushing on the crushed stones.

5. The secondary crushing device for a rock pipe jacking machine according to claim 4, characterized in that: At the end of the conveying outer housing (51) away from the conveying inner housing (52), a rotating support seat (62) is fixedly installed. Inside the spiral crushing rod (61), there is a shaft rod for driving the spiral crushing rod (61) to rotate. The shaft rod at the end of the spiral crushing rod (61) away from the crushed stone accommodating cavity passes through the rotating support seat (62) and is connected with a rotary drive seat (63). The rotary drive seat (63) cooperates with the drive device to rotate and drive the shaft rod.

6. The secondary crushing device for a rock pipe jacking machine according to claim 1, characterized in that: The telescopic adjustment assembly (53) is a hydraulic support rod. Linking seats are fixedly installed on the outer sides of the conveying outer housing (51) and the conveying inner housing (52) respectively, and the hydraulic support rod is installed between the two linking seats.

7. The secondary crushing device for a rock pipe jacking machine according to claim 6, characterized in that: At the end of the conveying inner housing (52) close to the slag discharge connecting seat (43), a guiding seat (55) is fixedly connected. Inside the guiding seat (55), a stabilizing pin (56) is fixedly installed. The stabilizing pin (56) is inserted and matched with the positioning hole on the slag discharge connecting seat (43).

8. The secondary crushing device for a rock pipe jacking machine according to claim 6, characterized in that: At the bottom of the conveying outer shell (51), there is a slag discharging assembly (7) for discharging mud and gravel. The slag discharging assembly (7) includes a slag discharging port (71) fixedly communicated with the bottom of the conveying outer shell (51). A closing plate (72) is slidably connected inside the slag discharging port (71). A first hydraulic telescopic rod (73) is fixedly installed on the conveying outer shell (51). The telescopic end of the first hydraulic telescopic rod (73) is fixedly connected to one side of the closing plate (72). The first hydraulic telescopic rod (73) pushes the closing plate (72) to slide for opening or closing the slag discharging port (71).

9. The secondary crushing device for a rock pipe jacking machine according to claim 8, wherein: An adjustable grading screen is installed obliquely along the conveying direction on the inner side of the slag discharging port (71). The grading screen includes a number of parallel screen bars. One end of each screen bar is movably connected to the side wall of the slag discharging port (71) through a hinge shaft, and the other end is connected to a screen gap adjusting hydraulic cylinder through a linkage rod. The screen gap adjusting hydraulic cylinder is fixed on the outer side wall of the slag discharging port (71), and the telescopic movement of its piston rod can synchronously change the inclination angle of all screen bars and the distance between adjacent screen bars.

10. A secondary crushing device for a rock pipe jacking machine according to claim 5, characterized in that: A high-pressure water jet pipe is coaxially nested inside the shaft rod of the spiral crushing rod (61). The high-pressure water jet pipe extends to the end of the spiral blade and is provided with a number of fan-shaped nozzles. A hydraulically driven water pressure regulating module is integrated on the outer wall of the conveying outer shell (51). The water pressure regulating module is communicated with the high-pressure water jet pipe through a rotary sealing joint.

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