Combined cutterhead and pipeline repair tunneling machine for breaking pipes.

Abstract

This invention belongs to the technical field of tunneling equipment, specifically disclosing a combined cutterhead for breaking pipelines and a pipeline replacement tunneling machine. The combined cutterhead includes a breaking shield, with several cutting blades extending in the front-to-back direction on the inner wall of the shield. These cutting blades are used to cut the old pipeline from its outer wall. A rotatable crushing device is located inside the breaking shield, positioned behind the cutting blades and equipped with several crushing cutters. The pipeline replacement tunneling machine includes the aforementioned combined cutterhead. During pipeline replacement operations, the breaking shield inserts into the soil layer, the cutting blades cut the old pipeline into strips, and the crushing device further crushes and breaks the old pipeline, achieving complete pulverization. This invention optimizes the pipeline breaking method and is applicable to the breaking and replacement of flexible pipelines, solving the problem of difficulties in replacing existing flexible pipelines.

Description

Technical Field

[0001] This invention belongs to the field of tunneling equipment technology, and in particular relates to a combined cutterhead and a tunneling machine for breaking up pipelines. Background Technology

[0002] With the rapid pace of urbanization, the problems caused by the aging underground pipe networks in old urban areas are becoming increasingly apparent, leading to frequent safety accidents such as road collapses due to damage to these networks. Furthermore, some pipes have small diameters, which can no longer meet the demands of development. Therefore, it is necessary to repair and upgrade the underground pipe networks.

[0003] Pipeline repair and replacement methods mainly include open-cut and trenchless methods. Open-cut methods have a significant impact on road traffic and environmental quality, and are now difficult to meet the construction requirements of urban core areas. Trenchless methods are currently the more commonly used pipeline replacement methods. Patent application CN115045668A (publication date: September 13, 2022) discloses a prefabricated pipe-breaking tunneling device. This device includes a jacking pipe, a ring-shaped steel plate support, and a tool pipe. The tool pipe is used to break the existing pipeline, and the ring-shaped steel plate support is equipped with multiple devices and is easy to disassemble and reuse. However, this device only uses the tool pipe to break the old pipeline, and its efficiency needs further investigation. In addition, this device also faces the problem of difficulty in controlling surface subsidence.

[0004] The applicant's invention patent with authorization announcement number CN111852493B provides a pipeline renewal tunneling machine and its construction method. The tunneling machine includes a main unit and a flow-maintaining circulation system. The main unit includes a shield and a cutting head. A slag removal and flow-maintaining device is located at the front of the main unit, passing through the tunneling main unit and connected to the flow-maintaining circulation system. During tunneling, the slag removal and flow-maintaining device precedes the cutting head, ensuring the flow of fluid media within the pipeline and achieving non-interruption-based renewal. The tunneling machine's cutting head is equipped with roller cutters and tearing blades, capable of breaking brittle pipes such as reinforced concrete and concrete. However, for flexible hoses such as HDPE (high-density polyethylene), due to the good toughness of the pipe material, elastic deformation easily occurs when squeezed by the cutting roller cutters, making them difficult to break. Summary of the Invention

[0005] The purpose of this invention is to provide a combined cutterhead for breaking up pipelines, thereby solving the technical problem of difficult replacement of flexible pipelines in the prior art. Another purpose of this invention is to provide a pipeline replacement tunneling machine having the aforementioned combined cutterhead, to solve the same technical problem.

[0006] To achieve the above objectives, the technical solution provided by this invention for a combined cutterhead for crushing pipelines is as follows:

[0007] A combined cutterhead for breaking pipes includes a breaking shield, the inner wall of which is provided with a plurality of cutting blades extending in a front-rear direction. The cutting blades are used to cut old pipes from the outer wall of the pipe. A rotatable breaking device is provided inside the breaking shield, the breaking device is located behind the cutting blades, and is provided with a plurality of breaking cutters.

[0008] The beneficial effects are as follows: This invention improves the design of the cutterhead for existing compression-type pipeline crushing. During pipeline replacement operations, the crushing shield inserts into the soil layer, the cutter slices the old pipeline into strips, and then the crushing device further compresses and crushes the old pipeline, achieving complete pulverization. This invention optimizes the pipeline crushing method and is applicable to the crushing and replacement of flexible pipelines, solving the problem of difficult replacement of existing flexible pipelines. Furthermore, the crushing shield also provides support, ensuring ground stability.

[0009] As a further improvement, the front end of the crushing device is connected to a spiral feeding structure that can rotate with the crushing device. The spiral feeding structure is used to grip and clamp the old pipe to transport old pipe fragments backward.

[0010] The beneficial effect is that the screw feeding mechanism rotates with the crushing device and undergoes a relative motion with the inner wall of the old pipe, similar to thread tapping, which transports the old pipe fragments backward and improves the efficiency of pipe crushing.

[0011] As a further improvement, the spiral feeding structure includes a fixed body for connection with the crushing device and a spiral blade disposed on the outer periphery of the fixed body, wherein the outer wall surface of the spiral blade is provided with threads for tapping.

[0012] The advantages are: compared with the traditional spiral groove tap spiral feeding structure, the spiral blade is easier to process and has a lower cost.

[0013] As a further improvement, the fixing body is a hollow cylinder, and the front end of the fixing body is provided with a flow port for sewage to flow through.

[0014] The beneficial effects are: sewage in the old pipeline can be discharged through the fixed body, which facilitates the operation of the slag removal and flow maintenance device of the tunneling machine, and realizes uninterrupted construction.

[0015] As a further improvement, a number of tearing blades are also provided between the cutter and the crushing device.

[0016] The beneficial effect is that it adds a pipe breaking device, which can further break the pipe with a tearing blade during the process of sending the old pipe in, thus ensuring the effectiveness of pipe breaking.

[0017] As a further improvement, an inclined plate inclined towards the crushing device is provided between the tearing blade and the inner wall of the crushing shield, and the tearing blade is fixedly connected to the inclined plate.

[0018] The beneficial effect is that the inclined plate and the tearing blade can also guide the old pipe to the crushing device, thus improving the crushing efficiency.

[0019] As a further improvement, the tearing blade is located on the rear side of the extension direction of the single cutter, and multiple such blades are arranged in a front-to-back pattern along the inclined plate.

[0020] The beneficial effect is that the friction between the tearing blade arranged behind the cutter and each fragment of the old pipe ensures that the old pipe as a whole does not rotate, thus preventing the old pipe from separating from the soil layer when the remaining length of the old pipe is small, thus losing the cutting effect.

[0021] As a further improvement, the combined cutter head includes a fixed disc, which is axially spaced from the crushing device. The fixed disc is provided with cutting tools for crushing pipes on its opposite end face to the crushing device and / or on the end face of the crushing device opposite to the fixed disc.

[0022] The beneficial effect is that it forms a double-layer extrusion and cutting structure, which ensures the crushing effect of the old pipe.

[0023] As a further improvement, the front end of the crushing shield is provided with a cutting edge for cutting forward into the soil layer.

[0024] The beneficial effects are: it improves the efficiency of the broken shield inserting into the soil layer, while further reducing the impact of construction on the soil layer above the old pipeline.

[0025] To achieve the above objectives, the technical solution for the pipeline renewal tunneling machine provided by this invention is as follows:

[0026] The pipeline renewal tunneling machine includes a combined cutterhead for breaking pipelines. The combined cutterhead includes a breaking shield. The inner wall of the breaking shield is provided with a plurality of cutting blades extending in a front-rear direction. The cutting blades are used to cut the old pipeline from the outer wall of the pipeline. The breaking shield is provided with a rotatable breaking device inside. The breaking device is located behind the cutting blades and is provided with a plurality of breaking cutters.

[0027] The beneficial effects are as follows: This invention improves the design of the cutterhead for existing compression-type pipeline crushing. During pipeline replacement operations, the crushing shield inserts into the soil layer, the cutter slices the old pipeline into strips, and then the crushing device further compresses and crushes the old pipeline, achieving complete pulverization. This invention optimizes the pipeline crushing method and is applicable to the crushing and replacement of flexible pipelines, solving the problem of difficult replacement of existing flexible pipelines. Furthermore, the crushing shield also provides support, ensuring ground stability.

[0028] As a further improvement, the front end of the crushing device is connected to a spiral feeding structure that can rotate with the crushing device. The spiral feeding structure is used to grip and clamp the old pipe to transport old pipe fragments backward.

[0029] The beneficial effect is that the screw feeding mechanism rotates with the crushing device and undergoes a relative motion with the inner wall of the old pipe, similar to thread tapping, which transports the old pipe fragments backward and improves the efficiency of pipe crushing.

[0030] As a further improvement, the spiral feeding structure includes a fixed body for connection with the crushing device and a spiral blade disposed on the outer periphery of the fixed body, wherein the outer wall surface of the spiral blade is provided with threads for tapping.

[0031] The advantages are: compared with the traditional spiral groove tap spiral feeding structure, the spiral blade is easier to process and has a lower cost.

[0032] As a further improvement, the fixing body is a hollow cylinder, and the front end of the fixing body is provided with a flow port for sewage to flow through.

[0033] The beneficial effects are: sewage in the old pipeline can be discharged through the fixed body, which facilitates the operation of the slag removal and flow maintenance device of the tunneling machine, and realizes uninterrupted construction.

[0034] As a further improvement, a number of tearing blades are also provided between the cutter and the crushing device.

[0035] The beneficial effect is that it adds a pipe breaking device, which can further break the pipe with a tearing blade during the process of sending the old pipe in, thus ensuring the effectiveness of pipe breaking.

[0036] As a further improvement, an inclined plate inclined towards the crushing device is provided between the tearing blade and the inner wall of the crushing shield, and the tearing blade is fixedly connected to the inclined plate.

[0037] The beneficial effect is that the inclined plate and the tearing blade can also guide the old pipe to the crushing device, thus improving the crushing efficiency.

[0038] As a further improvement, the tearing blade is located on the rear side of the extension direction of the single cutter, and multiple such blades are arranged in a front-to-back pattern along the inclined plate.

[0039] The beneficial effect is that the friction between the tearing blade arranged behind the cutter and each fragment of the old pipe ensures that the old pipe as a whole does not rotate, thus preventing the old pipe from separating from the soil layer when the remaining length of the old pipe is small, thus losing the cutting effect.

[0040] As a further improvement, the combined cutter head includes a fixed disc, which is axially spaced from the crushing device. The fixed disc is provided with cutting tools for crushing pipes on its opposite end face to the crushing device and / or on the end face of the crushing device opposite to the fixed disc.

[0041] The beneficial effect is that it forms a double-layer extrusion and cutting structure, which ensures the crushing effect of the old pipe.

[0042] As a further improvement, the front end of the crushing shield is provided with a cutting edge for cutting forward into the soil layer.

[0043] The beneficial effects are: it improves the efficiency of the broken shield inserting into the soil layer, while further reducing the impact of construction on the soil layer above the old pipeline. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the structure of embodiment 1 of the pipeline renewal tunneling machine in this invention;

[0045] Figure 2 for Figure 1 A partially enlarged schematic diagram of the combined cutter head;

[0046] Figure 3 for Figure 1 A partially enlarged schematic diagram showing the connection between the helical plate and the threaded joint;

[0047] Figure 4 for Figure 1 Left view of the medium crusher head;

[0048] Figure 5 This is a schematic diagram of the construction sequence I during the construction of the pipeline renewal tunneling machine embodiment 1 of the present invention;

[0049] Figure 6 This is a schematic diagram of the construction sequence II during the construction of Embodiment 1 of the pipeline renewal tunneling machine in this invention;

[0050] Figure 7 This is a schematic diagram of the state of step III during construction of embodiment 1 of the pipeline renewal tunneling machine in this invention;

[0051] Figure 8 This is a schematic diagram of the state of step IV during construction of embodiment 1 of the pipeline renewal tunneling machine in this invention;

[0052] Figure 9 This is a schematic diagram of the state of step V during construction of the pipeline renewal tunneling machine embodiment 1 of the present invention.

[0053] Explanation of reference numerals in the attached figures:

[0054] 1. Existing pipeline; 2. Crushing shield; 3. Cutter; 4. Tear cutter; 5. Inclined plate; 6. Crushing cutterhead; 61. Crushing cutter; 62. Fixed plate; 7. Shield; 8. Main unit; 9. New pipeline; 10. Sealing plate; 11. Fixed body; 12. Spiral blade; 13. Tooth clip; 14. Existing shaft; 15. Starting shaft; 16. Receiving shaft; 17. Jacking device; 18. Pipeline replacement tunneling machine. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0056] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0057] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the process or method that includes said element.

[0058] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0059] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the term "provided with" should be interpreted broadly. For example, the object "provided with" can be a part of the main body, or it can be separately arranged from the main body and connected to the main body. This connection can be a detachable connection or a non-detachable connection. Those skilled in the art can understand the specific meaning of the above terms in this invention through specific circumstances.

[0060] The present invention will be further described in detail below with reference to the embodiments.

[0061] Specific embodiment 1 of the pipeline renewal tunneling machine provided by the present invention:

[0062] The pipeline renewal tunneling machine provided in this embodiment is as follows: Figure 1 As shown, the system includes a main unit 8, which comprises a shield body 7 and a combined cutterhead located at the front end of the shield body 7. During operation, the combined cutterhead excavates forward, breaking up the old pipe and creating a new pipe replacement position. The rear of the main unit 8 is used to connect a new pipe 9, and as the main unit 8 advances, the new pipe 9 is pulled into the pipe replacement position, completing the pipe replacement.

[0063] like Figure 1 and Figure 2 As shown, the combined cutterhead includes a crushing shield 2, the rear end of which is connected to the shield 7 via bolts. The inner diameter of the crushing shield 2 is larger than the outer diameter of the old pipeline 1. During construction, the crushing shield 2 inserts into the soil layer surrounding the old pipeline 1, peeling the old pipeline 1 from the soil layer. While crushing the old pipeline 1, the crushing shield 2 also acts as a support, ensuring the stability of the stratum. To improve insertion efficiency and further reduce the impact on the stratum, the front end of the crushing shield 2 is also equipped with a cutting edge. Several cutting blades 3 extending in the front-back direction are provided on the inner wall of the crushing shield 2. The cutting blades 3 can contact the outer wall of the old pipeline 1 and, as the main unit 8 advances forward, cut the old pipeline 1 into strip-shaped fragments.

[0064] The crushing shield 2 also houses a crushing device for crushing old pipelines. In this embodiment, the crushing device is a crushing disc 6. The shield 7 houses a main drive device (not shown in the figure) for driving the crushing disc 6 to rotate. The crushing disc 6 is located behind the cutter 3. A fixing plate 62 is also arranged behind the crushing disc 6, and the fixing plate 62 is fixed to the shield partition. The fixing plate 62 and the crushing disc 6 are axially spaced apart, and the axial gap between the fixing plate 62 and the crushing disc 6 forms the crushing gap for crushing the old pipeline. Figure 4As shown, the rear end of the breaker disc 6 is equipped with several breaker blades 61 for squeezing, tearing, and breaking old pipes. After being cut by the breaker blades 61, the old pipes are fragmented. During construction, as the main unit 8 moves forward, the strips of old pipe 1 cut by the cutter 3 enter the breaking gap between the breaker disc 6 and the fixed disc 62, and are cut into fragments by the breaker disc 6. Of course, in other embodiments, the breaker blades 61 can also be set at the front end of the fixed disc 62, or both the front end of the fixed disc 62 and the rear end of the breaker disc 6 can be equipped with breaker blades 61, as long as a cutting action can be achieved between the two mating gaps.

[0065] A screw feeding mechanism is connected to the front end of the crusher disc 6, and the screw feeding mechanism can rotate with the crusher disc 6. Figure 3 As shown, the spiral feeding mechanism includes a fixed body 11 fixedly connected to the crushing disc 6 and a spiral blade 12 sleeved on the outer periphery of the fixed body 11. The outer wall of the spiral blade 12 is provided with teeth 13 that can grip and engage the inner wall of the old pipe 1. During construction, the fixed body 11 rotates with the crushing disc 6, driving the spiral blade 12 to rotate. The teeth 13 grip and engage the old pipe 1 fragments cut into strips by the cutter 1, driving the old pipe 1 strips to move backward and enter the crushing disc 6. That is, the function of the spiral feeding mechanism is to feed material to the crushing disc 6, which significantly improves the pipe crushing efficiency. In addition, the spiral feeding mechanism also avoids the problem that the old pipe fragments move forward synchronously with the main unit, causing the old pipe fragments to be unable to generate relative movement with the crushing disc 6, ensuring that the strip-shaped old pipe fragments can stably enter the crushing gap between the crushing disc 6 and the fixed disc 62.

[0066] Several tearing blades 4 are also provided between the cutter 3 and the crushing disc 6. The spiral feeding mechanism drives the old pipe 1 fragments to rotate, and the fragments and tearing blades 4 can also generate relative cutting motion, further enhancing the crushing effect on the old pipe 1. The tearing blades 4 can be hard alloy blocks welded to the inside of the crushing shield 2. An inclined plate 5 is provided on the rear side of the extension direction of a single cutter 3, which is inclined towards the crushing disc 6. Multiple layers of tearing blades 4 are provided on the inclined plate 5, that is, the tearing blades 4 are arranged at an inclination towards the crushing disc 6. This inclined arrangement structure not only further guides the material to the crushing disc 6, but also ensures that the friction between the tearing blades arranged on the rear side of the cutter 3 and each old pipe fragment ensures that the old pipe as a whole will not rotate. This avoids the problem that when the remaining length of the old pipe is small, the old pipe as a whole separates from the soil layer and rotates relative to the cutter 3, making it impossible to cut.

[0067] The fixed body 11 is a hollow cylinder with a sealing plate 10 on the front side. Cutting tools can also be installed on the outer surface of the sealing plate 10. During construction, the cutting tools rotate with the fixed body 11 and cut and tear any deposited foreign objects that may exist in the old pipe 1, preventing the crushing disc 6 from being jammed by foreign objects in the old pipe 1, and further improving the crushing efficiency.

[0068] This embodiment can be used for trenchless replacement of HDPE and other plastic flexible pipes. The specific construction steps are as follows:

[0069] Step 1: Construction Preparation: such as Figure 5 As shown, the in-situ demolition and replacement construction section of the old pipeline 1 is determined based on the location of the existing manhole 14 (municipal inspection manhole), that is, the starting manhole and receiving manhole are determined. Then, the sewage at both ends of the old pipeline is diverted to ensure that there is no sewage in the pipeline replacement section of the old pipeline 1.

[0070] Step 2: Construction of the working well: such as Figure 6 As shown, after determining the locations of the launching shaft 15 and the receiving shaft 16, excavation is carried out from the ground downwards to construct the launching shaft 15 and the receiving shaft 16.

[0071] Step 3: Install the tunneling equipment: such as Figure 7 As shown, after the pipeline replacement tunneling machine 18 is hoisted into the starting shaft 15, a jacking device 17 is installed at the rear end of the pipeline replacement tunneling machine 18. The front end of the jacking device 17 is used to push the pipeline replacement tunneling machine 18 forward and tighten it, and the rear end is used to tighten the tunnel wall of the starting shaft 15.

[0072] Step 4: Jacking construction: such as Figure 8 As shown, the jacking device 17 begins to advance forward, pushing the pipeline replacement tunneling machine 18 into the old pipeline section. The crushing shield 2 inserts into the soil layer surrounding the old pipeline 1, and the cutter breaks the old pipeline 1 into strip-shaped fragments. The spiral blade 12 clamps the inner wall of the old pipeline 1, conveying the old pipeline 1 to the crushing disc 6. After multi-stage crushing by the tearing blade 4 and the crushing disc 6, the old pipeline 1 is broken into fragments. At the same time, a new pipeline section 9 is jacked in, completing the replacement of one section of pipeline.

[0073] Step 5: Receiving device: such as Figure 9 As shown, after the pipeline replacement section is completed, the pipeline replacement tunneling machine 18 is pushed out of the pipeline and enters the receiving shaft 16. Then, the opening is sealed to complete the construction of one replacement section.

[0074] Unlike existing compression-type excavation cutterheads, the combined cutterhead in this embodiment utilizes the good toughness of flexible pipes when breaking and repairing them. The crushing shield 2 presses the flexible pipe into the interior of the crushing shield, and after multi-stage crushing by the cutter 3, the crushing cutterhead 6, and other components, the old pipe 1 is broken into fragments. This solves the problem of poor crushing effect of flexible pipes and the difficulty in replacing them using trenchless methods.

[0075] The second embodiment of the pipeline renewal tunneling machine provided by this invention differs from the first embodiment mainly in that: in this embodiment, the sealing plate 10 at the front end of the fixed body 11 of the combined cutterhead is a grid structure, and the grid holes allow sewage to flow forward and backward, forming a sewage flow port. Of course, the sealing plate at the front end of the fixed body 11 can also retain only one opening, just enough to maintain sewage flow. At this time, the pipeline renewal tunneling machine is also equipped with a slag removal and flow maintenance system to achieve uninterrupted construction, further reducing the impact on the environment.

[0076] The specific embodiment 3 of the pipeline renewal tunneling machine provided by this invention differs from embodiment 1 mainly in that: In embodiment 1, the crushing device of the combined cutterhead includes a crushing cutterhead 6, and the end of the crushing cutterhead 6 is equipped with crushing blades. In this embodiment, the crushing device includes a disc-shaped or cylindrical body, or even a cylindrical shape, with crushing blades for crushing the pipeline arranged on the outer ring surface of its body. The specific structure is similar to a cutting drum. The strip-shaped old pipeline fragments crushed by the cutter enter the crushing device, and the crushing rotation can still achieve secondary cutting and crushing of the old pipeline. Therefore, it should be noted that the combined cutterhead in this invention does not refer only to the crushing cutterhead 61 in embodiment 1, but should be broadly understood as the overall device for crushing pipelines connected to the front end of the shield body 7.

[0077] The specific embodiment 4 of the pipeline renewal tunneling machine provided by this invention differs from embodiment 1 mainly in that: in embodiment 1, the spiral tapping structure of the combined cutterhead includes a fixed body 11 and a spiral blade 12. In this embodiment, the spiral blade may not be included; the fixed body has a spiral groove on its outer periphery, and its specific structure is similar to that of a spiral groove tap. Threads are provided on both sides of the spiral groove, and the rotation of the fixed body can also serve to feed into and grip the old pipeline.

[0078] The specific embodiment 5 of the pipeline renewal tunneling machine provided by this invention differs from embodiment 1 mainly in that: in embodiment 1, a tearing blade 4 is provided between the cutter 3 and the crushing blade 6 of the combined cutterhead. In this embodiment, the tearing blade can be omitted, and the strip-shaped fragments can directly enter the crushing blade to achieve the same crushing effect.

[0079] The specific embodiment 6 of the pipeline renewal tunneling machine provided by this invention differs from embodiment 1 mainly in that: in embodiment 1, the tearing blade 4 of the combined cutterhead is arranged behind the extending direction of the cutting blade 3, thus serving to prevent rotation. In this embodiment, the tearing blade is arranged between two adjacent cutting blades, which can also serve to further break up the pipeline.

[0080] The specific embodiment 7 of the pipeline renewal tunneling machine provided by the present invention differs from embodiment 1 mainly in that: Figure 2As shown, in Embodiment 1, the diameters of the crushing disc 6 and the fixed disc 62 are the same. In this embodiment, the diameter of the crushing disc 6 can be smaller than the diameter of the fixed disc 62. The crushing disc 6 can provide a buffer against pipe fragments entering the gap between the fixed disc 62 and the crushing disc 6, which is beneficial for the pipe fragments to smoothly enter the gap between the fixed disc 62 and the crushing disc 6.

[0081] Specific embodiments of the combined cutterhead for pipe crushing in this invention:

[0082] The embodiments of the combined cutterhead are those described in any of the embodiments 1 to 7 of the above-mentioned pipeline renewal tunneling machine, and will not be specifically described here.

[0083] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A combined cutterhead for crushing pipes, characterized in that, The system includes a crushing shield, the inner wall of which is provided with several cutters extending in a front-to-back direction. These cutters are used to cut flexible old pipes from their outer walls. A rotatable crushing device is located inside the crushing shield, positioned behind the cutters and equipped with several crushing blades to break the flexible old pipe into fragments. The front end of the crushing device is connected to a spiral feeding structure that rotates with the crushing device. The spiral feeding structure overlaps with the cutters in its radial projection, used to grip and convey the old pipe fragments backward. The spiral feeding structure includes a fixed body for connection to the crushing device and spiral blades located on the outer periphery of the fixed body. The outer wall surface of the spiral blades is provided with threads for tapping. The fixed body is a hollow cylinder, and its front end has a flow port for wastewater flow. The combined cutterhead includes a fixed disc, which is axially spaced from the crushing device. The fixed disc has cutting blades for crushing the pipe on its opposite end face and / or on the end face of the crushing device opposite the fixed disc.

2. The combined cutterhead for pipe crushing according to claim 1, characterized in that, Several tearing blades are also provided between the cutter and the crushing device, located behind the cutter, to restrict the rotation of the old pipe through the friction between the tearing blades and the old pipe.

3. The combined cutterhead for pipe crushing according to claim 2, characterized in that, An inclined plate is provided between the tearing blade and the inner wall of the crushing shield, which is inclined towards the crushing device, and the tearing blade is fixedly connected to the inclined plate.

4. The combined cutterhead for pipe crushing according to claim 3, characterized in that, The tearing blade is located on the rear side of the extension direction of the single cutter, and multiple blades are arranged in a front-to-back pattern along the inclined plate.

5. The combined cutterhead for pipe crushing according to claim 1, characterized in that, The front end of the crushing shield is equipped with a cutting edge for cutting forward into the soil layer.

6. A pipeline replacement tunneling machine, characterized in that, The device includes a combined cutterhead, comprising a crushing shield. The inner wall of the crushing shield is provided with several cutting blades extending in a front-to-back direction. These cutting blades are used to cut flexible old pipes from their outer wall. A rotatable crushing device is located inside the crushing shield, positioned behind the cutting blades and equipped with several crushing cutters to break the flexible old pipe into fragments. The front end of the crushing device is connected to a rotating spiral feeding structure. The spiral feeding structure overlaps with the cutting blades in its radial projection, used to grip and clamp the old pipe. The old pipe fragments are conveyed backward; the spiral feeding structure includes a fixed body for connection with the crushing device and a spiral blade disposed on the outer periphery of the fixed body, the outer wall surface of the spiral blade is provided with threads for tapping; the fixed body is an internally hollow cylinder, and the front end of the fixed body is provided with a flow port for sewage to flow through; the combined cutter head includes a fixed plate, the fixed plate is axially spaced from the crushing device, and the fixed plate is provided with cutting tools for crushing pipes on the opposite end face of the crushing device and / or the end face of the crushing device opposite to the fixed plate.

7. The pipeline renewal tunneling machine according to claim 6, characterized in that, Several tearing blades are also provided between the cutter and the crushing device, located behind the cutter, to restrict the rotation of the old pipe through the friction between the tearing blades and the old pipe.

8. The pipeline renewal tunneling machine according to claim 7, characterized in that, An inclined plate is provided between the tearing blade and the inner wall of the crushing shield, which is inclined towards the crushing device, and the tearing blade is fixedly connected to the inclined plate.

9. The pipeline renewal tunneling machine according to claim 8, characterized in that, The tearing blade is located on the rear side of the extension direction of the single cutter, and multiple blades are arranged in a front-to-back pattern along the inclined plate.

10. The pipeline renewal tunneling machine according to claim 6, characterized in that, The front end of the crushing shield is equipped with a cutting edge for cutting forward into the soil layer.

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