Railway overhead line system square foundation pit rotary excavating mechanism, control method, medium and equipment

Abstract

The invention relates to the field of foundation pit excavating equipment, in particular to a railway contact net square foundation pit rotary excavating mechanism, a control method, a medium and equipment. Comprising a transmission rod, a first heading head and a second heading head, and the first heading head or the second heading head is detachably connected to the output end of the transmission rod. The transmission rod comprises a transmission body and transmission auger blades. The first tunneling head comprises a first tunneling drill bit and is used for excavating a circular foundation pit. The second tunneling head comprises two second tunneling drill bits, and the rotating axes of the two second tunneling drill bits are perpendicular to the center line of the transmission rod. The transmission rod can be detachably connected with the first tunneling head and the second tunneling head. Wherein the first tunneling head can excavate a circular initial foundation pit, and the second tunneling head can trim and expand the edge of the circular initial foundation pit, so that a square foundation pit is formed. The device is more suitable for excavating small square foundation pits, and the efficiency is higher.

Description

Background Art

[0002] The foundation pits on the railway serve multiple functions, covering all aspects from infrastructure construction to later maintenance, ensuring the safe and efficient operation of the railway system. Among them, the railway contact network foundation pit refers to the square foundation pit excavated for the installation and fixing of contact network pillars (or poles) when building electrified railways. The contact network is a facility that provides power to electric locomotives, electric multiple units, etc. It transmits electricity to the train through wires (usually copper or copper alloy wires) suspended above the line and in contact with the pantograph on the top of the train. And the railway contact network foundation pit is a square foundation pit.

[0003] Some existing square foundation pits with larger sizes are generally excavated using excavators with appropriate buckets. For some square foundation pits with smaller sizes, large excavators cannot be used and there is no special equipment for excavation. Usually, manual excavation is required, which makes the excavation efficiency low. Summary of the invention

[0004] In view of the above technical problems, the technical solution adopted by the present invention is:

[0005] According to one aspect of the present invention, a railway contact network square foundation pit rotary excavation mechanism is provided, comprising: a transmission rod, a first excavation head and a second excavation head, wherein the first excavation head or the second excavation head is detachably connected to the output end of the transmission rod.

[0006] The transmission rod comprises a transmission body and a transmission auger blade. The transmission auger blade is spirally wound on the outer circumferential wall of the transmission body and extends to the output end of the transmission rod.

[0007] The first excavation head includes a first excavation connecting rod, an excavation auger blade and a first excavation drill bit. One end of the first excavation connecting rod is coaxially connected to the output end of the transmission rod. The other end of the first excavation connecting rod is coaxially connected to the first excavation drill bit, and the first excavation drill bit is used to excavate a circular foundation pit.

[0008] The tunneling auger blades are spirally wound on the outer circumferential wall of the first tunneling connecting rod. The tunneling auger blades and the transmission auger blades have the same pitch and outer diameter, so that when the first tunneling head is in a connected state with the transmission rod, the tunneling auger blades and the transmission auger blades can be fully connected.

[0009] The second excavation head includes a second excavation connecting rod, a hydraulic drive unit and two second excavation drill bits. One end of the second excavation connecting rod is coaxially connected to the output end of the transmission rod. The other end of the second excavation connecting rod is connected to the hydraulic drive unit, and the two second excavation drill bits are relatively connected to the two output ends of the hydraulic drive unit. The rotation axes of the two second excavation drill bits are perpendicular to the center line of the transmission rod.

[0010] Further, the second drilling drill bit comprises:

[0011] A cylindrical rotating body and a plurality of excavation teeth are provided, wherein the plurality of excavation teeth are obliquely arranged on the outer circumferential wall of the rotating body. The rotating body is connected to the output end of the hydraulic drive unit, and the rotating axis of the rotating body is arranged colinearly with the rotating axis of the output end of the hydraulic drive unit.

[0012] Furthermore, the maximum excavation boundary distance between the two second excavation drill bits is equal to the excavation diameter of the first excavation drill bit.

[0013] Furthermore, the outer diameter of the second drilling drill bit is equal to the diameter of the first drilling drill bit.

[0014] Furthermore, it also includes:

[0015] Hydraulic power source and tunneling guide rail,

[0016] The excavation guide rail includes a slide rail, a first slider, a second slider and two distance sensors. The first slider and the second slider are both slidably arranged on the slide rail, and the first slider moves on the slide rail through a gear rack transmission mechanism.

[0017] The hydraulic power source is arranged on the first sliding block, a guide hole is arranged on the second sliding block, and the transmission rod passes through the guide hole and is connected with the hydraulic power source.

[0018] The two distance sensors are respectively arranged on the first slider and the second slider, and are used for acquiring the distance between the first slider and the second slider.

[0019] Furthermore, the diameter of the guide hole is greater than or equal to the outer diameter of the transmission auger blade.

[0020] Furthermore, the first tunneling head and the second tunneling head are both detachably connected to the output end of the transmission rod by means of flange connection.

[0021] According to a second aspect of the present invention, a control method for a square foundation pit rotary excavation mechanism for a railway overhead contact network is provided, which is applied to a square foundation pit rotary excavation mechanism for a railway overhead contact network. The control method comprises the following steps:

[0022] According to the complementary area between the excavation areas corresponding to the two second excavation drill bits and the excavation area corresponding to the first excavation drill bit and the preset foundation pit excavation depth L, the amount of remaining soil for hole modification is generated.

[0023] According to the amount of remaining soil after the hole modification, the excavation depth L1 of the first boring head and the excavation depth L2 of the second boring head are generated. L1>L>L2.

[0024] The first tunneling head is controlled to rotate and excavate to a depth of L1 and then stops excavating. The second tunneling head is controlled to rotate and excavate to a depth of L2 and then stops rotating, and continues to advance downward to a preset foundation pit excavation depth L.

[0025] According to a third aspect of the present invention, there is provided a non-transitory computer-readable storage medium storing a computer program, which, when executed by a processor, implements the above-mentioned control method for a square foundation pit rotary excavation mechanism of a railway contact network.

[0026] According to a fourth aspect of the present invention, there is provided an electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned control method for a square foundation pit rotary excavation mechanism of a railway contact network when executing the computer program.

[0027] The present invention has at least the following beneficial effects:

[0028] The transmission rod in the rotary excavation mechanism for the square foundation pit of the railway contact network of the present invention can be detachably connected to the first boring head and the second boring head respectively. Among them, the first boring head can dig a circular initial foundation pit under the rotation of the transmission rod. Two second boring drill bits are relatively arranged in the second boring head, and the rotation axes of the two second boring drill bits are perpendicular to the center line of the transmission rod. Therefore, when the two second boring drill bits rotate, the edge of the circular initial foundation pit can be trimmed and expanded to remove the soil layers on the four corners corresponding to the circumscribed square corresponding to the circular initial foundation pit, thereby forming a square foundation pit. Since the sizes of the first boring head and the second boring head can be set to a form that is more suitable for small-sized square foundation pits, they are more suitable for excavating small square foundation pits and are more efficient.

[0029] In addition, when the first tunneling head is used for excavation, the transmission rod and the first tunneling head rotate coaxially, and since the first tunneling connecting rod and the transmission body are respectively provided with tunneling auger blades and transmission auger blades, during the excavation of the circular initial foundation pit, the excavated excess soil can be guided out through the auger blades, thereby ensuring that there is no excess soil in the initial foundation pit and there is no need to clean the excess soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A schematic diagram of the overall structure of a transmission rod provided in an embodiment of the present invention;

[0032] Figure 2 A schematic diagram of the overall structure of a first tunneling head provided by an embodiment of the present invention;

[0033] Figure 3 A schematic diagram of the overall structure of a second boring head provided by an embodiment of the present invention;

[0034] Figure 4 A schematic diagram of the overall structure of the connection structure between the hydraulic power source, the tunneling guide rail and the transmission rod provided in an embodiment of the present invention;

[0035] Figure 5 A schematic flow chart of a control method for a square foundation pit rotary excavation mechanism of a railway overhead contact network provided in an embodiment of the present invention.

[0036] Reference numerals

[0037] 10. Transmission body; 11. Transmission auger blade; 20. First excavation connecting rod; 21. Excavation auger blade; 22. First excavation drill bit; 30. Second excavation connecting rod; 31. Hydraulic drive unit; 32. Rotating body; 33. Excavation teeth; 40. Slide rail; 41. First slider; 42. Second slider; 43. Guide hole; 44. Rack and pinion transmission mechanism; 45. Hydraulic power source; 5. Flange. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0039] As a possible embodiment of the present invention, Figures 1 to 4 As shown, a rotary excavation mechanism for a square foundation pit of a railway contact network is provided, comprising: a transmission rod, a first excavation head and a second excavation head, wherein the first excavation head or the second excavation head is detachably connected to the output end of the transmission rod. Specifically, the first excavation head and the second excavation head are both detachably connected to the output end of the transmission rod by means of a flange 5. That is, a connecting flange 5 is provided on the first excavation head and the second excavation head, and a connecting flange 5 is provided on the output end of the transmission rod, and then the two flanges 5 are detachably connected by bolts.

[0040] like Figure 1 As shown, the transmission rod includes a transmission body 10 and a transmission auger blade 11, the transmission auger blade 11 is spirally wound on the outer circumferential wall of the transmission body 10, and the transmission auger blade 11 extends to the output end of the transmission rod. The transmission rod in this embodiment can be the remaining part of the existing rotary drill after removing the drill bit.

[0041] like Figure 2As shown, the first excavation head includes a first excavation connecting rod 20, an excavation auger blade 21 and a first excavation drill bit 22. One end of the first excavation connecting rod 20 is coaxially connected to the output end of the transmission rod. The other end of the first excavation connecting rod 20 is coaxially connected to the first excavation drill bit 22, and the first excavation drill bit 22 is used to excavate a circular foundation pit. The first excavation drill bit 22 can use an existing drill bit for excavating a circular foundation pit.

[0042] The excavation auger blade 21 is spirally wound on the outer circumferential wall of the first excavation connecting rod 20, and the excavation auger blade 21 and the transmission auger blade 11 have the same pitch and outer diameter, so that when the first excavation head and the transmission rod are in a connected state, the excavation auger blade 21 and the transmission auger blade 11 can be completely connected. In this way, during the excavation process of the circular initial foundation pit, the excavated excess soil can be smoothly guided from the bottom of the pit to the outside of the pit through the auger.

[0043] like Figure 3 As shown, the second excavation head includes a second excavation connecting rod 30, a hydraulic drive unit 31 and two second excavation drill bits. One end of the second excavation connecting rod 30 is coaxially connected to the output end of the transmission rod, the other end of the second excavation connecting rod 30 is connected to the hydraulic drive unit 31, and the two second excavation drill bits are relatively connected to the two output ends of the hydraulic drive unit 31. The rotation axes of the two second excavation drill bits are perpendicular to the center line of the transmission rod.

[0044] Specifically, the second drilling drill bit includes:

[0045] The cylindrical rotating body 32 and the plurality of digging teeth 33 are obliquely arranged on the outer circumferential wall of the rotating body 32. The rotating body 32 is connected to the output end of the hydraulic driving part 31, and the rotating axis of the rotating body 32 is arranged colinearly with the rotating axis of the output end of the hydraulic driving part 31.

[0046] The two second boring drill bits can rotate around the axis under the drive of the hydraulic drive unit 31. The excavation space formed by the two second boring drill bits is projected as a rectangle on the horizontal plane, so the edge of the circular initial foundation pit can be trimmed and expanded to remove the soil layers on the four corners corresponding to the circumscribed square corresponding to the circular initial foundation pit, thereby forming a square foundation pit.

[0047] Specifically, in order to form a square foundation pit, the excavation diameter between the first excavation drill bit 22 and the second excavation drill bit (that is, the maximum diameter of the circular boundary formed when the drill bit rotates) and the installation distance between the two second excavation drill bits must be limited. The specific settings are as follows:

[0048] The maximum excavation boundary distance between the two second excavation drill bits is equal to the excavation diameter of the first excavation drill bit 22. The outer diameter of the second excavation drill bit is equal to the diameter of the first excavation drill bit 22. This ensures that the cross section of the square foundation pit expanded by the two second excavation drill bits is exactly the circumscribed square corresponding to the cross section of the circular initial foundation pit.

[0049] In the present embodiment, since a hydraulic drive unit 31 is sandwiched between the two second boring drill bits, there is a circular edge area between the two second boring drill bits that cannot be trimmed by the second boring heads. In order to reduce the circular edge area that cannot be trimmed, the width of the hydraulic drive unit 31 can be reduced, or the hydraulic drive unit 31 can be built into the columnar rotating body 32.

[0050] Further, such as Figure 4 As shown, the railway contact network square foundation pit rotary excavation mechanism also includes:

[0051] Hydraulic power source 45 and excavation guide rail,

[0052] The excavation guide rail includes a slide rail 40 , a first slider 41 , a second slider 42 and two distance sensors. The first slider 41 and the second slider 42 are both slidably disposed on the slide rail 40 , and the first slider 41 moves on the slide rail 40 through a gear rack transmission mechanism 44 .

[0053] The hydraulic power source 45 is arranged on the first slider 41, and the second slider 42 is provided with a guide hole 43, through which the transmission rod is connected to the hydraulic power source 45. The diameter of the guide hole 43 is greater than or equal to the outer diameter of the transmission auger blade 11. The guide hole 43 on the second slider 42 can be used to limit the radial movement of the transmission rod, thereby ensuring that the size of the circular initial foundation pit is substantially the same as the excavation size of the first boring drill bit 22. Thus, it is ensured that when the second boring head is excavating, the excavation boundary can be exactly the circumscribed square of the circular initial foundation pit, thereby ensuring the shape quality of the formed square foundation pit.

[0054] The hydraulic power source 45 is used to drive the transmission rod to rotate, so as to drive the first boring head to rotate. In addition, the hydraulic power source 45 is also used to drive the hydraulic drive unit 31 to drive the two second boring drill bits to rotate. Moreover, the hydraulic power source 45 is also used to drive the first sliding block 41 to move on the slide rail 40 by driving the gear rack transmission mechanism 44, thereby controlling the excavation depth.

[0055] Two distance sensors are respectively arranged on the first slider 41 and the second slider 42, and are used to obtain the distance between the first slider 41 and the second slider 42. Through the distance sensors, the excavation depth L1 of the first tunneling head and the excavation depth L2 of the second tunneling head can be controlled more accurately.

[0056] According to a second aspect of the present invention, Figure 5As shown, a control method for a square foundation pit rotary excavation mechanism for a railway overhead contact network is provided, which is applied to the above-mentioned square foundation pit rotary excavation mechanism for a railway overhead contact network. The control method comprises the following steps:

[0057] S100: Generate the amount of remaining soil for hole modification according to the complementary area between the excavation areas corresponding to the two second excavation drill bits and the excavation area corresponding to the first excavation drill bit 22 and the preset foundation pit excavation depth.

[0058] The complementary area is the area of ​​the four corners corresponding to the circumscribed square corresponding to the circular initial foundation pit. Through the complementary area and the preset foundation pit excavation depth L, the amount of residual soil for hole modification can be generated, that is, the residual soil generated when the second excavation head trims the edge of the circular initial foundation pit. These residual soils cannot be discharged from the foundation pit during the excavation process and will eventually spread to the bottom of the pit.

[0059] S200: Generate the excavation depth L1 of the first excavation head and the excavation depth L2 of the second excavation head according to the amount of residual soil in the modified hole. L1>L>L2.

[0060] In order to avoid cleaning up the remaining soil again, the difference in depth between the two excavations by the excavation mechanism in this embodiment can be used to compact the remaining soil at the bottom of the pit again to avoid removing the remaining soil again.

[0061] Specifically, L1 and L2 satisfy the following conditions respectively:

[0062]

[0063]

[0064] Wherein, R1 and R2 are the drilling diameters of the first drilling bit 22 and the second drilling bit respectively, K1 is the compression coefficient, K1<1, such as K1=0.9.

[0065] S300: Control the first tunneling head to rotate and excavate to a depth of L1 and then stop excavating; control the second tunneling head to rotate and excavate to a depth of L2 and then stop the rotation of the second tunneling head, and continue to advance downward to a preset foundation pit excavation depth L to compact the remaining soil.

[0066] In this embodiment, the difference in the depth of the two excavations by the excavation mechanism is controlled to fill the remaining soil during the second excavation to the bottom of the pit, and the reserved remaining soil filling space is smaller than the remaining soil amount, and the end tamping operation of the second tunneling head is combined to compact the remaining soil at the bottom of the pit, while avoiding the work of removing the remaining soil again.

[0067] In addition, although the steps of the method in the present disclosure are described in a specific order in the drawings, this does not require or imply that the steps must be performed in this specific order, or that all the steps shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps, etc.

[0068] Through the description of the above implementation, it is easy for those skilled in the art to understand that the example implementation described here can be implemented by software, or by software combined with necessary hardware. Therefore, the technical solution according to the implementation of the present disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, including several instructions to enable a computing device (which can be a personal computer, a server, a mobile terminal, or a network device, etc.) to execute the method according to the implementation of the present disclosure.

[0069] In an exemplary embodiment of the present disclosure, an electronic device capable of implementing the above method is also provided.

[0070] It will be appreciated by those skilled in the art that various aspects of the present invention may be implemented as a system, method or program product. Therefore, various aspects of the present invention may be specifically implemented in the following forms, namely: a complete hardware implementation, a complete software implementation (including firmware, microcode, etc.), or a combination of hardware and software, which may be collectively referred to herein as a "circuit", "module" or "system".

[0071] The electronic device according to this embodiment of the present invention is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0072] The electronic device is presented in the form of a general-purpose computing device. The components of the electronic device may include, but are not limited to: the at least one processor mentioned above, the at least one storage device mentioned above, and a bus connecting different system components (including storage devices and processors).

[0073] The storage stores program codes, which can be executed by the processor, so that the processor executes the steps according to various exemplary embodiments of the present invention described in the above “Exemplary Method” section of this specification.

[0074] The memory may include readable media in the form of volatile memory, such as random access memory (RAM) and / or cache memory, and may further include read only memory (ROM).

[0075] The storage may also include a program / utility having a set (at least one) of program modules, such program modules including but not limited to: an operating system, one or more application programs, other program modules and program data, each of which or some combination may include the implementation of a network environment.

[0076] The bus may represent one or more of several types of bus structures including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor, or a local bus using any of a variety of bus architectures.

[0077] The electronic device may also communicate with one or more external devices (e.g., keyboards, pointing devices, Bluetooth devices, etc.), may communicate with one or more devices that enable a user to interact with the electronic device, and / or may communicate with any device (e.g., routers, modems, etc.) that enables the electronic device to communicate with one or more other computing devices. Such communication may be performed through an input / output (I / O) interface. Furthermore, the electronic device may also communicate with one or more networks (e.g., local area networks (LANs), wide area networks (WANs), and / or public networks, such as the Internet) through a network adapter. The network adapter communicates with other modules of the electronic device through a bus. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with the electronic device, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, etc.

[0078] Through the description of the above implementation, it is easy for those skilled in the art to understand that the example implementation described here can be implemented by software, or by software combined with necessary hardware. Therefore, the technical solution according to the implementation of the present disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, including several instructions to enable a computing device (which can be a personal computer, a server, a terminal device, or a network device, etc.) to execute the method according to the implementation of the present disclosure.

[0079] In an exemplary embodiment of the present disclosure, a computer-readable storage medium is also provided, on which a program product capable of implementing the above method of the present specification is stored. In some possible implementations, various aspects of the present invention may also be implemented in the form of a program product, which includes a program code, and when the program product is run on a terminal device, the program code is used to enable the terminal device to execute the steps according to various exemplary embodiments of the present invention described in the above "Exemplary Method" section of the present specification.

[0080] The program product may use any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0081] Computer readable signal media may include data signals propagated in baseband or as part of a carrier wave, in which readable program code is carried. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Readable signal media may also be any readable medium other than a readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0082] The program code embodied on the readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wired, optical cable, RF, etc., or any suitable combination of the foregoing.

[0083] Program code for performing the operations of the present invention may be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., through the Internet using an Internet service provider).

[0084] In addition, the above-mentioned figures are only schematic illustrations of the processes included in the method according to an exemplary embodiment of the present invention, and are not intended to be limiting. It is easy to understand that the processes shown in the above-mentioned figures do not indicate or limit the time sequence of these processes. In addition, it is also easy to understand that these processes can be performed synchronously or asynchronously, for example, in multiple modules.

[0085] It should be noted that, although several modules or units of the device for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiments of the present disclosure, the features and functions of two or more modules or units described above can be embodied in one module or unit. On the contrary, the features and functions of one module or unit described above can be further divided into multiple modules or units to be embodied.

[0086] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A square foundation pit rotary excavation mechanism for a railway contact network, characterized in that: include: A transmission rod, a first tunneling head and a second tunneling head, wherein the first tunneling head or the second tunneling head is detachably connected to the output end of the transmission rod; The transmission rod comprises a transmission body and a transmission auger blade, wherein the transmission auger blade is spirally wound on the outer circumferential wall of the transmission body, and the transmission auger blade extends to the output end of the transmission rod; The first excavation head comprises a first excavation connecting rod, an excavation auger blade and a first excavation drill bit; one end of the first excavation connecting rod is coaxially connected to the output end of the transmission rod; the other end of the first excavation connecting rod is coaxially connected to the first excavation drill bit, and the first excavation drill bit is used to excavate a circular foundation pit; The excavation auger blade is spirally wound on the outer circumferential wall of the first excavation connecting rod, and the excavation auger blade and the transmission auger blade have the same pitch and outer diameter, so that when the first excavation head and the transmission rod are in a connected state, the excavation auger blade and the transmission auger blade can be completely connected; The second tunneling head includes a second tunneling connecting rod, a hydraulic drive unit and two second tunneling drill bits; one end of the second tunneling connecting rod is coaxially connected to the output end of the transmission rod; the other end of the second tunneling connecting rod is connected to the hydraulic drive unit, and the two second tunneling drill bits are relatively connected to the two output ends of the hydraulic drive unit; the rotation axes of the two second tunneling drill bits are perpendicular to the center line of the transmission rod.

2. A railway overhead contact network square foundation pit rotary excavation mechanism according to claim 1, characterized in that: The second drilling drill bit comprises: A columnar rotating body and a plurality of digging teeth, wherein the plurality of digging teeth are obliquely arranged on the outer circumferential wall of the rotating body; the rotating body is connected to the output end of the hydraulic drive unit, and the rotation axis of the rotating body is colinearly arranged with the rotation axis of the output end of the hydraulic drive unit.

3. A square foundation pit rotary excavation mechanism for railway overhead contact network according to claim 2, characterized in that: The maximum excavation boundary distance between the two second excavation drill bits is equal to the excavation diameter of the first excavation drill bit.

4. A railway overhead contact network square foundation pit rotary excavation mechanism according to claim 3, characterized in that: The outer diameter of the second drilling drill bit is equal to the diameter of the first drilling drill bit.

5. The square foundation pit rotary excavation mechanism for railway overhead contact network according to claim 1, characterized in that: Also includes: Hydraulic power source and tunneling guide rail, The excavation guide rail comprises a slide rail, a first slide block, a second slide block and two distance sensors, the first slide block and the second slide block are both slidably arranged on the slide rail, and the first slide block moves on the slide rail through a gear rack transmission mechanism; The hydraulic power source is arranged on the first sliding block, a guide hole is arranged on the second sliding block, and the transmission rod passes through the guide hole and is connected with the hydraulic power source; The two distance sensors are respectively arranged on the first slider and the second slider, and are used for acquiring the distance between the first slider and the second slider.

6. A railway overhead contact network square foundation pit rotary excavation mechanism according to claim 5, characterized in that: The diameter of the guide hole is greater than or equal to the outer diameter of the transmission auger blade.

7. A square foundation pit rotary excavation mechanism for railway overhead contact network according to claim 1, characterized in that: The first tunneling head and the second tunneling head are both detachably connected to the output end of the transmission rod by means of flange connection.

8. A control method for a square foundation pit rotary excavation mechanism of a railway overhead contact network, characterized in that: Using a railway overhead contact network square foundation pit rotary excavation mechanism as claimed in any one of claims 1 to 7, the control method comprises the following steps: Generate the amount of remaining soil for hole modification according to the complementary area between the excavation areas corresponding to the two second excavation drill bits and the excavation area corresponding to the first excavation drill bit and the preset foundation pit excavation depth L; According to the amount of residual soil in the modified hole, the excavation depth L1 of the first excavation head and the excavation depth L2 of the second excavation head are generated; L1>L>L2; The first tunneling head is controlled to rotate and excavate to a depth of L1 and then stops excavating. The second tunneling head is controlled to rotate and excavate to a depth of L2 and then stops rotating, and continues to advance downward to a preset foundation pit excavation depth L.

9. A non-transitory computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by the processor, the control method of the square foundation pit rotary excavation mechanism of the railway contact network as claimed in claim 8 is implemented.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the control method of the square foundation pit rotary excavation mechanism of the railway contact network as described in claim 8 is implemented.

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