A hydraulic pressure oil discharge recovery system of a shaft boring machine

Abstract

The application discloses a vertical shaft tunneling machine hydraulic oil leakage recovery system, which comprises a relay oil tank, the relay oil tank is used for storing and conveying leakage oil, an oil liquid conveying system, a first oil outlet of the oil liquid conveying system is communicated with a second oil inlet of the relay oil tank, a first oil inlet of the oil liquid conveying system is connected with a second oil outlet of the relay oil tank, a hydraulic plunger motor, the hydraulic plunger motor is connected with a first oil suction port of the leakage oil at the bottom of the relay oil tank, the leakage oil is generated through the hydraulic plunger motor, and a vertical shaft tunneling main bin, an air pressure balance port of the vertical shaft tunneling main bin is communicated with a breathing port of the relay oil tank and is used for balancing the internal pressure difference of the relay oil tank. Compared with the prior art, the scheme solves the problems of excessive shell pressure, plunger motor oil seal leakage and other faults caused by the fact that the leakage oil port of the plunger motor is directly connected with the ground oil tank and a height difference is generated, effectively reduces the cost and improves the equipment reliability.

Description

Technical Field

[0001] This application relates to the field of hydraulic systems for engineering machinery and equipment, and more specifically, to a hydraulic oil draining and recovery system for a shaft boring machine. Background Technology

[0002] As underground engineering construction develops towards greater depth and scale, shafts, as key channels in mining, urban utility tunnels, and rail transit projects, have seen their excavation efficiency and construction safety become core industry demands. Shaft excavators, as specialized equipment for achieving efficient shaft excavation, are experiencing rapid market demand and technological iteration. The drum of the shaft excavator is the core component for completing rock and soil cutting and needs to operate continuously in complex muddy and watery environments at depths exceeding 80 meters. Due to the damp and enclosed deep water areas inside the shaft, long-term immersion of high-voltage cables can easily lead to safety accidents such as insulation aging and leakage.

[0003] In existing technologies, shaft boring machines generally use hydraulic piston motors to power the drums to avoid the safety risks of electric drives. However, existing technologies still have problems where, when the piston motor's oil port is directly connected to the surface hydraulic pump station's oil tank, the pressure in its casing exceeds the allowable standard due to the height difference, leading to oil seal leakage and casing cracking.

[0004] Therefore, how to provide a hydraulic oil draining and recovery system for shaft boring machines that avoids overpressure of the casing, balances the pressure difference of the oil tank, and has no electrical hazards has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] To address the aforementioned technical problems, this application provides a hydraulic oil drain and recovery system for a vertical shaft boring machine. This system solves the problem of excessive pressure in the casing caused by the direct connection of the piston motor's oil leakage port to the ground oil tank, resulting in a height difference and subsequent oil seal leakage in the piston motor. This effectively reduces costs and improves equipment reliability.

[0006] The technical solution provided in this application is as follows: This application provides a hydraulic oil leakage recovery system for a shaft boring machine, comprising: a relay oil tank for storing and transporting leaked oil; an oil conveying system, wherein a first oil outlet of the oil conveying system is connected to a second oil inlet of the relay oil tank; a hydraulic plunger motor connected to a first oil suction port at the bottom of the relay oil tank for generating the leaked oil; and a shaft boring main chamber, wherein a pressure balance port of the shaft boring main chamber is connected to a vent of the relay oil tank for balancing the internal pressure difference of the relay oil tank.

[0007] Further, in a preferred embodiment of this utility model, the relay oil tank further includes: a three-way flow regulating valve, the three-way flow regulating valve including: a third oil inlet, a third oil outlet, and a spare oil outlet, the third oil inlet being connected to the second oil inlet; a hydraulic motor, the hydraulic motor including: a fourth oil inlet and a fourth oil outlet, the fourth oil inlet being connected to the third oil outlet, the hydraulic motor being used to control the oil output; a leakage oil pump, the leakage oil pump including a second oil suction port and a fifth oil outlet, the leakage oil pump being drivenly connected to the hydraulic motor through a transmission assembly, the second oil suction port being connected to the bottom of the relay oil tank for sucking up leakage oil, the fifth oil outlet being connected to the spare oil outlet and the fourth oil outlet through a first check valve, leading to the third oil outlet; wherein, the three-way flow regulating valve is used to control the speed of the hydraulic motor.

[0008] Furthermore, in a preferred embodiment of this utility model, the three-way flow regulating valve further includes: a valve body, the valve body having a third oil inlet, a third oil outlet, and a spare oil outlet; a float installed on the valve body, the float floating in the relay oil tank for detecting changes in the liquid level of the relay oil tank; a valve core installed inside the valve body, the valve core for controlling the high-pressure oil flow of the three-way flow regulating valve; and a valve stem with one end fixedly connected to the float and the other end connected to the valve core via a transmission connection.

[0009] Furthermore, in a preferred embodiment of this utility model, the fourth oil outlet of the hydraulic motor is connected to the fifth oil outlet of the leaking oil pump, sharing a common oil pipeline to return the oil to the ground oil tank.

[0010] Furthermore, in a preferred embodiment of this utility model, the oil delivery system further includes: an electromagnetic pressure control module, wherein the high-pressure oil inlet of the electromagnetic pressure control module is connected to the first oil outlet, and the low-pressure oil return end of the electromagnetic pressure control module is connected to the first oil inlet; a second check valve, the second check valve including an oil inlet and an oil outlet, the oil outlet being connected to the high-pressure oil inlet; a hydraulic oil pump, one end of which is connected to the ground oil tank for drawing oil and pressurizing it, and the other end of which is connected to the high-pressure oil inlet; and a pressure detection device, disposed on the hydraulic oil pump for detecting the output pressure of the hydraulic oil pump.

[0011] Furthermore, in a preferred embodiment of this utility model, the pressure detection device is specifically a hydraulic oil pressure gauge.

[0012] Furthermore, in a preferred embodiment of this utility model, the relay oil tank is connected to the oil delivery system, the shaft excavation main chamber, and the hydraulic plunger motor via an oil pipeline.

[0013] Furthermore, in a preferred embodiment of this utility model, the electromagnetic pressure control module is specifically an electromagnetic overflow valve element.

[0014] Furthermore, in a preferred embodiment of the present invention, the transmission assembly further includes a bell-shaped cover and a coupling, wherein one end of the bell-shaped cover is fixedly connected to the hydraulic motor, and the other end is coaxially connected to the leakage oil pump via the coupling.

[0015] This application provides a second technical solution as follows: This application also provides a shaft boring machine, including the hydraulic oil drainage and recovery system for shaft boring machines described in any one of the above claims.

[0016] This utility model provides a hydraulic oil leakage and recovery system for a shaft boring machine, comprising: a relay oil tank for storing and transporting leaked oil; an oil conveying system, wherein a first oil outlet of the oil conveying system is connected to a second oil inlet of the relay oil tank; a hydraulic plunger motor connected to a first oil suction port at the bottom of the relay oil tank for generating the leaked oil; and a shaft boring main chamber, wherein a pressure balance port of the shaft boring main chamber is connected to a vent of the relay oil tank for balancing the internal pressure difference of the relay oil tank. The intermediate oil tank collects leaking oil from the hydraulic plunger motor and acts as an intermediate buffer unit. This prevents the leaking oil from being directly transported to the surface oil tank, where the static pressure generated by the shaft's operating height would directly act on the plunger motor housing. This reduces the possibility of abnormal pressure accumulation at the source and keeps the internal leakage pressure of the plunger motor housing within the design standard range. The air pressure balance port of the main shaft excavation chamber is connected to the breather port of the intermediate oil tank via a hydraulic hose. This allows for timely balancing of the pressure difference generated within the intermediate oil tank as the oil volume changes with the input and output flow rates. This prevents excessive pressure difference from affecting the smooth flow of leaking oil into the intermediate oil tank, indirectly ensuring stable pressure around the plunger motor housing and avoiding local pressure fluctuations caused by pressure differences. The oil delivery system establishes a stable system for the leaking oil by correspondingly connecting the first oil outlet to the second oil inlet of the intermediate oil tank and the first oil inlet to the second oil outlet of the intermediate oil tank. The fixed delivery path reduces the amount of hydraulic hoses used from the surface pump station to the well, adapting to the limited space and cost control requirements within the well. It also avoids pressure loss or local pressure rise caused by messy pipelines, further assisting in the control of the plunger motor housing pressure. The entire solution relies on mechanical structure and hydraulic drive to achieve its functions, without introducing electrical components such as motors and electronic sensors. This avoids the safety hazards caused by high-voltage cables and electrical harnesses entering deep water areas. At the same time, it keeps the plunger motor housing pressure within the allowable range, effectively avoiding failures such as oil seal leakage and housing cracking. It also reduces the wear of precision components inside the motor to extend its service life. The orderly recovery and delivery of leaked oil also realizes oil recycling, reducing the cost caused by hydraulic oil loss. Overall, it ensures the reliability and economy of the shaft boring machine hydraulic system from three aspects: buffering and pressure reduction, pressure difference balance, and path optimization. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1A schematic diagram of the hydraulic oil draining and recovery system for a shaft boring machine provided in this embodiment of the present invention; Figure 2 This is an installation diagram of the oil delivery system provided in an embodiment of the present invention; Figure 3 A schematic diagram of the installation of the relay oil tank provided for an embodiment of this utility model; Figure 4 A schematic diagram of the connection port of the relay oil tank provided in this embodiment of the utility model; Figure 5 A plan view of the main shaft excavation chamber provided in an embodiment of this utility model; Figure 6 A schematic diagram of the three-way flow regulating valve provided in this embodiment of the utility model.

[0019] Reference numerals: 1. Oil delivery system; A1. First oil outlet; A2. First oil inlet; 11. Hydraulic oil pump; 12. Pressure detection device; 13. Second check valve; 131. Oil inlet; 132. Oil outlet; 14. Electromagnetic pressure control module; 141. High-pressure oil inlet; 2. Relay oil tank; B1. Second oil inlet; B2. Second oil outlet; 21. Three-way flow regulating valve; 211. Third oil inlet; 212. Third oil outlet; 213. Backup oil outlet; 22. Hydraulic motor; 221. Fourth oil inlet; 222. Fourth oil outlet; 23. Leaking oil pump; 231. Second suction port; 232. Fifth oil outlet; 3. Shaft excavation main chamber; 4. Hydraulic piston motor. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0022] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "first", "second", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0024] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0025] like Figures 1 to 6 As shown in the embodiment of this application, a hydraulic oil leakage recovery system for a shaft boring machine includes: a relay oil tank 2, which is used to store and transport leaked oil; The oil delivery system 1 has a first oil outlet A1 connected to the second oil inlet B1 of the relay oil tank 2, and a first oil inlet A2 connected to the second oil outlet B2 of the relay oil tank 2. Hydraulic piston motor 4, connected to the first oil suction port B4 of the leaking oil at the bottom of the relay oil tank 2, the leaking oil is generated by the hydraulic piston motor 4; The main shaft excavation chamber 3 has an air pressure balance port C1 connected to the breather port B3 of the relay oil tank 2, which is used to balance the internal pressure difference of the relay oil tank 2.

[0026] This utility model provides a hydraulic oil leakage recovery system for a shaft boring machine, specifically including: a relay oil tank 2, used to store and transport leaked oil; an oil conveying system 1, the first oil outlet A1 of the oil conveying system 1 being connected to the second oil inlet B1 of the relay oil tank 2, and the first oil inlet A2 of the oil conveying system 1 being connected to the second oil outlet B2 of the relay oil tank 2; a hydraulic plunger motor 4, connected to the first oil suction port B4 at the bottom of the relay oil tank 2 for leaked oil, the leaked oil being generated by the hydraulic plunger motor 4; and a shaft boring main chamber 3, the air pressure balance port C1 of the shaft boring main chamber 3 being connected to the breather port B3 of the relay oil tank 2 for balancing the internal pressure difference of the relay oil tank 2. The oil delivery system 1 is typically located on the surface; the main shaft excavation chamber 3 and the hydraulic plunger motor 4 are located at the downhole working face; and the intermediate oil tank 2, as a key pressure buffer unit, is installed inside or near the main shaft excavation chamber 3. Its position is much higher than the hydraulic plunger motor 4 but much lower than the surface oil tank, significantly reducing the hydrostatic pressure difference between it and the plunger motor 4. The intermediate oil tank 2 directly receives leaked oil from the hydraulic plunger motor 4 and temporarily stores it. Because the height difference between the intermediate oil tank 2 and the plunger motor 4 is much smaller than the height difference of the direct return oil to the surface oil tank, the back pressure acting on the plunger motor 4 housing is controlled within a safe range, effectively avoiding the risk of oil seal damage and housing cracking. Simultaneously, the breather port B3 is connected to the air pressure balance port C1 of the main shaft excavation chamber 3, ensuring that the gas space above the oil surface inside the intermediate oil tank 2 is always balanced with the air pressure of the main chamber, thus guaranteeing the smooth return of leaked oil and preventing the oil tank from deforming due to pressure difference.

[0027] The technical solution of this utility model will be described in detail below with reference to specific embodiments: Specifically, in an embodiment of this utility model, the relay oil tank 2 further includes: a three-way flow regulating valve 21, which includes: a third oil inlet 211, a third oil outlet 212, and a spare oil outlet 213, wherein the third oil inlet 211 is connected to the second oil inlet B1; and a hydraulic motor 22, which includes: a fourth oil inlet 221 and a fourth oil outlet 222, wherein the fourth oil inlet 221 is connected to the third oil outlet 212, and the hydraulic motor 22 is used to control the oil output. The leakage oil pump 23 includes a second suction port 231 and a fifth outlet port 232. The leakage oil pump 23 is connected to the hydraulic motor via a transmission assembly. The second suction port 231 is connected to the bottom of the relay oil tank 2 and is used to draw in leakage oil. The fifth outlet port 232 is connected to the spare outlet port 213 and the fourth outlet port 222 via a first check valve 24 and leads to the third outlet port 212. The three-way flow regulating valve 21 is used to control the speed of the hydraulic motor 22.

[0028] In one embodiment of this utility model, the three-way flow regulating valve 21 has its third inlet 211 connected to the second inlet B1 of the relay oil tank 2 to receive high-pressure oil. It intelligently adjusts the flow rate from its third outlet 212 to the hydraulic motor 22 based on changes in the liquid level within the relay oil tank, thereby precisely controlling the speed of the hydraulic motor. Furthermore, the hydraulic motor 22 is coaxially connected to the leakage oil pump 23 via a transmission assembly, converting hydraulic energy into mechanical energy to drive the leakage oil pump 23 to actively draw leakage oil from the bottom of the relay oil tank through the second suction port 231. This ensures smooth oil flow. To ensure stability, the oil discharged from the fifth outlet 232 of the leaking oil pump 23 first flows through the first check valve 24 to prevent backflow, and then merges with the return oil from the fourth outlet 222 of the hydraulic motor 22 and the backup outlet 213 of the three-way flow regulating valve 21, and together they flow back to the ground oil tank through the loop connected to the third outlet 212. This configuration not only achieves intrinsically safe level control without external power and avoids the risk of overflow or evacuation of the relay oil tank, but also significantly improves the system's response efficiency and operational reliability under complex deep well conditions by matching the pumping rate with the leakage amount in real time.

[0029] More specifically, in this embodiment, the three-way flow control valve can be a Bosch Rexroth 4WRPEH series high-frequency response proportional valve with a response time of less than 25 milliseconds, which can achieve precise stepless flow regulation through a 4-20mA signal; for operating conditions requiring higher anti-contamination performance, a Huade FD series pressure-flow composite control valve can be selected, which adopts a mechanical feedback mechanism and can maintain stable performance even when the oil cleanliness is low. The selection of hydraulic motors must match the characteristics of valve components: Eaton 2KA series gear hydraulic motors have high starting torque, making them particularly suitable for starting oil pumps; while in applications requiring higher power density, Parker Hannifin F11 series swashplate fixed displacement motors can provide smoother speed output. Meanwhile, for the leakage oil pump 23, which serves as the execution terminal of the recovery system, the Burger S series external gear pump is preferred, as it has a volumetric efficiency of over 92% and strong self-priming capability; when installation space is limited, the compact design of the Nachi PZ series miniature gear pump can save 40% of installation space. This configuration can keep the pressure of the leakage oil recovery system stable within a safe range, fully meeting the back pressure protection requirements of the hydraulic piston motor.

[0030] Specifically, in the embodiments of this utility model, the three-way flow regulating valve 21 further includes: a valve body 2101, which has a third oil inlet 211, a third oil outlet 212, and a spare oil outlet 213; a float 2102 installed on the valve body 2101, which floats in the relay oil tank 2 and is used to detect changes in the liquid level of the relay oil tank 2; a valve core 2103 installed inside the valve body, which is used to control the high-pressure oil flow of the three-way flow regulating valve 21; and a valve stem 2104, which is fixedly connected to the float 2102 at one end and drivenly connected to the valve core 2103 at the other end.

[0031] In this embodiment, the valve body 2101 serves as a basic component, internally machined with a third oil inlet 211, a third oil outlet 212, and a spare oil outlet 213 that are interconnected. The valve body is mounted on the side wall of the relay oil tank 2 via a flange, and the third oil inlet 211 is connected to the main oil circuit of the system via a high-pressure oil pipe. The valve body has a precision-machined valve cavity, with its axis at a preset angle to the horizontal plane to optimize the flow path. The float 2102 is connected to the lower end of the valve stem 2104 via a hinge mechanism. The float diameter is designed according to the tank volume to ensure that the float 2102 can sensitively respond to changes in liquid level. The valve core 2103 adopts a stepped slide valve structure. A pressure equalization groove is opened in the large-diameter section to eliminate hydraulic clamping force, and a V-shaped throttling groove is machined in the small-diameter section to achieve linear flow regulation. The upper end of the valve stem 2104 is connected to the valve core 2103 via a thread, and the lower end... The valve core is driven by a ball joint and a float connecting rod forming a universal joint to compensate for installation coaxiality errors. A limiting boss is provided in the middle of the valve stem to limit the valve core stroke. When the liquid level rises, the float 2102 moves upward, pushing the valve core 2103 downward through the valve stem 2104, increasing the flow area from the third oil inlet 211 to the third oil outlet 212, thereby increasing the flow rate of the hydraulic motor 22. When the liquid level drops, the valve core moves upward under the action of the return spring to reduce the opening. The spare oil outlet 213 is always connected to the return oil circuit.

[0032] More specifically, in this embodiment, the valve body can be made of medium carbon steel casting, the valve body mounting flange is connected to the oil tank pre-welded flange, and sealed with an oil-resistant rubber gasket. The float adopts a hollow stainless steel spherical structure, and the outer surface of the float is treated with polytetrafluoroethylene coating to prevent oil adhesion from affecting sensitivity.

[0033] Specifically, in the embodiments of this utility model, the oil delivery system 1 further includes: an electromagnetic pressure control module 14, the high-pressure oil inlet 141 of the electromagnetic pressure control module 14 being connected to the first oil outlet A1, and the low-pressure oil return end 142 of the electromagnetic pressure control module 14 being connected to the first oil inlet; a second check valve 13, the second check valve 13 including an oil inlet 131 and an oil outlet 132, the oil outlet 132 being connected to the high-pressure oil inlet 141; a hydraulic oil pump 11, one end of the hydraulic oil pump being connected to the ground oil tank for drawing oil and pressurizing it, and the other end being connected to the high-pressure oil inlet 141; and a pressure detection device 12, which is installed on the hydraulic oil pump 11 for detecting the output pressure of the hydraulic oil pump 11.

[0034] In this embodiment, the hydraulic pump 11's suction port is connected to the ground oil tank via a suction hose; its outlet is connected to subsequent pipelines via a high-pressure steel pipe. A pressure detection device 12 is installed at the pressure testing point of the hydraulic pump 11's outlet via a pressure gauge switch. The gauge's range should cover at least 1.5 times the system's maximum working pressure; for example, when the system's working pressure is 20 MPa, a pressure gauge with a range of 0-40 MPa can be used. The second check valve 13 must ensure that its oil inlet 131 faces the oil outlet direction of the hydraulic pump 11, while its closed oil inlet 132 is connected to the high-pressure inlet 141 of the electromagnetic pressure control module 14 via a hydraulic pipeline. An oil-resistant sealing gasket is required between the valve body and the mounting plate to ensure a seal. The electromagnetic pressure control module 14 connects to the oil supply of the second check valve 13 at one end via a tee connector, and to the main output oil line leading to the relay oil tank 2 at the other end. Its low-pressure return end 142 is connected to the ground oil tank via a return oil filter. This module receives electrical signals from the control system, drives the internal electromagnet to actuate, thereby precisely controlling the pilot oil circuit and ultimately the opening pressure of the main valve core. This enables remote setting and stable control of the system pressure. Through the above implementation, the hydraulic delivery system 1 achieves a stable supply of high-pressure hydraulic fluid and precise pressure control. The electromagnetic pressure control module 14 ensures that the system pressure will not exceed limits due to fluctuations in operating conditions, the second check valve 13 provides reliable unidirectional flow assurance, and the pressure detection device 12 provides real-time status monitoring. The entire system is compact, precisely controlled, safe, and reliable, providing a powerful power foundation for the hydraulic oil drain and recovery system of the shaft boring machine.

[0035] Specifically, in the embodiments of this utility model, the pressure detection device 12 is a hydraulic oil pressure gauge.

[0036] Specifically, in the embodiments of this utility model, the relay oil tank 2 is connected to the oil delivery system 1, the shaft excavation main chamber 3, and the hydraulic plunger motor 4 via an oil pipeline.

[0037] Specifically, in the embodiments of this utility model, the electromagnetic pressure control module 14 is specifically an electromagnetic overflow valve element.

[0038] Specifically, in the embodiments of this utility model, the transmission assembly further includes: a bell-shaped cover and a coupling. One end of the bell-shaped cover is fixedly connected to the hydraulic motor 22, and the other end is coaxially connected to the leakage oil pump 23 through the coupling.

[0039] In this embodiment, the transmission assembly is used to achieve coaxial transmission connection between the output shaft of the hydraulic motor 22 and the input shaft of the leaking oil pump 23. Its core function is to transmit torque and compensate for installation deviations. The assembly mainly consists of two parts: a bell-shaped housing and a coupling, which together form a closed transmission cavity. The bell-shaped housing is a cylindrical shell with a flange at one end. The flange end of the bell-shaped housing is fixedly connected to the output flange of the hydraulic motor 22 by bolts. The flange mating surface is coated with sealant to ensure a seal. The other end is provided with a stop positioning structure to accurately accommodate the coupling and connect to the leaking oil pump 23. The coupling consists of two alloy steel hubs and an intermediate nylon elastomer. The clearance between the end faces of the hydraulic motor shaft and the oil pump shaft is controlled at 3-5 mm and is precisely adjusted by adjusting shims inside the bell-shaped housing.

[0040] This application also provides a shaft tunneling machine, including: any one of the shaft tunneling machine hydraulic oil drainage and recovery systems.

[0041] As described above, the present utility model embodiment relates to a hydraulic oil leakage and recovery system for a shaft boring machine, comprising a relay oil tank for storing and transporting leaked oil; an oil conveying system, wherein a first oil outlet of the oil conveying system is connected to a second oil inlet of the relay oil tank, and the first oil inlet of the oil conveying system is connected to the second oil outlet of the relay oil tank; a hydraulic plunger motor connected to a first oil suction port for leaked oil at the bottom of the relay oil tank, wherein the leaked oil is generated by the hydraulic plunger motor; and a shaft boring main chamber, wherein the air pressure balance port of the shaft boring main chamber is connected to the breather port of the relay oil tank for balancing the internal pressure difference of the relay oil tank. The intermediate oil tank collects leaking oil from the hydraulic plunger motor and acts as an intermediate buffer unit. This prevents the leaking oil from being directly transported to the surface oil tank, where the static pressure generated by the shaft's operating height would directly act on the plunger motor housing. This reduces the possibility of abnormal pressure accumulation at the source and keeps the internal leakage pressure of the plunger motor housing within the design standard range. The air pressure balance port of the main shaft excavation chamber is connected to the breather port of the intermediate oil tank via a hydraulic hose. This allows for timely balancing of the pressure difference generated within the intermediate oil tank as the oil volume changes with the input and output flow rates. This prevents excessive pressure difference from affecting the smooth flow of leaking oil into the intermediate oil tank, indirectly ensuring stable pressure around the plunger motor housing and avoiding local pressure fluctuations caused by pressure differences. The oil delivery system establishes a stable system for the leaking oil by correspondingly connecting the first oil outlet to the second oil inlet of the intermediate oil tank and the first oil inlet to the second oil outlet of the intermediate oil tank. The fixed delivery path reduces the amount of hydraulic hoses used from the surface pump station to the well, adapting to the limited space and cost control requirements within the well. It also avoids pressure loss or local pressure rise caused by messy pipelines, further assisting in the control of the plunger motor housing pressure. The entire solution relies on mechanical structure and hydraulic drive to achieve its functions, without introducing electrical components such as motors and electronic sensors. This avoids the safety hazards caused by high-voltage cables and electrical harnesses entering deep water areas. At the same time, it keeps the plunger motor housing pressure within the allowable range, effectively avoiding failures such as oil seal leakage and housing cracking. It also reduces the wear of precision components inside the motor to extend its service life. The orderly recovery and delivery of leaked oil also realizes oil recycling, reducing the cost caused by hydraulic oil loss. Overall, it ensures the reliability and economy of the shaft boring machine hydraulic system from three aspects: buffering and pressure reduction, pressure difference balance, and path optimization.

[0042] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hydraulic oil drain and recovery system for a shaft boring machine, characterized in that, include: Intermediate oil tank (2), which is used to store and transport leaked oil; The oil delivery system (1) has its first oil outlet (A1) connected to the second oil inlet (B1) of the relay oil tank (2), and its first oil inlet (A2) connected to the second oil outlet (B2) of the relay oil tank (2). A hydraulic piston motor (4) is connected to the first oil suction port (B4) of the leaking oil at the bottom of the relay oil tank (2), and the leaking oil is generated by the hydraulic piston motor (4); The main shaft excavation chamber (3) has a pressure balance port (C1) connected to the breathing port (B3) of the relay oil tank (2) to balance the internal pressure difference of the relay oil tank (2).

2. The hydraulic oil drainage and recovery system for a shaft boring machine according to claim 1, characterized in that, The relay tank (2) also includes: Three-way flow regulating valve (21), the three-way flow regulating valve (21) includes: a third oil inlet (211), a third oil outlet (212), and a spare oil outlet (213), the third oil inlet (211) being connected to the second oil inlet (B1); The hydraulic motor (22) includes a fourth oil inlet (221) and a fourth oil outlet (222), the fourth oil inlet (221) being connected to the third oil outlet (212), and the hydraulic motor (22) being used to control the oil output. The leakage oil pump (23) includes a second suction port (231) and a fifth outlet port (232). The leakage oil pump (23) is connected to the hydraulic motor via a transmission assembly. The second suction port (231) is connected to the bottom of the relay oil tank (2) for sucking up leakage oil. The fifth outlet port (232) is connected to the spare outlet port (213) and the fourth outlet port (222) via a first check valve (24) and leads to the third outlet port (212). The three-way flow regulating valve (21) is used to control the speed of the hydraulic motor (22).

3. The hydraulic oil drainage and recovery system for a shaft boring machine according to claim 2, characterized in that, The three-way flow regulating valve (21) also includes: The valve body (2101) includes a third oil inlet (211), a third oil outlet (212), and a spare oil outlet (213). A float (2102) is installed on the valve body (2101), and the float (2102) floats in the relay oil tank (2) to detect the liquid level change in the relay oil tank (2); The valve core (2103) installed inside the valve body is used to control the high-pressure oil flow of the three-way flow regulating valve (21); A valve stem (2104) with one end fixedly connected to the float (2102) and the other end connected to the valve core (2103) via transmission.

4. The hydraulic oil drainage and recovery system for a shaft boring machine according to claim 2, characterized in that, The fourth oil outlet (222) of the hydraulic motor (22) is connected to the fifth oil outlet (232) of the leaking oil pump (23), sharing a common oil pipeline to return the oil to the ground oil tank.

5. The hydraulic oil drainage and recovery system for a shaft boring machine according to claim 4, characterized in that, The oil delivery system (1) also includes: The electromagnetic pressure control module (14) has a high-pressure oil inlet (141) connected to the first oil outlet (A1) and a low-pressure oil return (142) connected to the first oil inlet. The second check valve (13) includes an oil inlet (131) and an oil outlet (132), the oil outlet (132) being connected to the high-pressure oil inlet (141); Hydraulic oil pump (11), one end of which is connected to the ground oil tank for drawing oil and pressurizing it, and the other end of which is connected to the high-pressure oil inlet (141); A pressure detection device (12) is installed on the hydraulic oil pump (11) to detect the output pressure of the hydraulic oil pump (11).

6. The hydraulic oil drainage and recovery system for a shaft boring machine according to claim 5, characterized in that, The pressure detection device (12) is specifically a hydraulic oil pressure gauge.

7. The hydraulic oil drainage and recovery system for a shaft boring machine according to claim 5, characterized in that, The relay oil tank (2) is connected to the oil delivery system (1), the shaft excavation main chamber (3) and the hydraulic plunger motor (4) via an oil pipeline.

8. The hydraulic oil drainage and recovery system for a shaft boring machine according to claim 5, characterized in that, The electromagnetic pressure control module (14) is specifically an electromagnetic overflow valve element.

9. The hydraulic oil drainage and recovery system for a shaft boring machine according to claim 2, characterized in that, The transmission assembly also includes a bell-shaped cover and a coupling. One end of the bell-shaped cover is fixedly connected to the hydraulic motor (22), and the other end is coaxially connected to the leakage oil pump (23) through the coupling.

10. A vertical shaft tunneling machine, characterized in that, include: The hydraulic oil draining and recovery system for a shaft boring machine according to any one of claims 1 to 9.

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