Shield tunneling machine open-close type cooling water circulation system and tunneling equipment with shield tunneling machine open-close type cooling water circulation system

Abstract

The utility model discloses an open-close type cooling water circulation system of a shield tunneling machine and tunneling equipment with the open-close type cooling water circulation system. The open-close type cooling water circulation system comprises a balance water tank, an inner circulation water tank, a to-be-cooled device set, an inner circulation water pump, a radiator and a pipeline system, wherein the balance water tank and the inner circulation water tank are communicated with the atmosphere. The balanced reservoir is located at the highest point of the system arrangement position and communicated with the lowest point of the pressure in the system. The balanced reservoir, the internal circulation water tank, the internal circulation water pump, the to-be-cooled device set and the radiator are connected through the pipeline system to form a water circulation system, and the internal circulation water pump, the to-be-cooled device set and the radiator are sequentially communicated end to end through opening and closing of related valves in the pipeline system to form a closed water circulation loop. Or the internal circulation water tank, the internal circulation water pump, the to-be-cooled device group and the radiator are sequentially communicated end to end to form an open type water circulation loop. According to the system, an open type water circulation loop or a closed type water circulation loop which can be freely switched can be formed according to needs, so that the requirements of different shield tunneling working conditions are met, and the system works stably.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel boring equipment, in particular to an open-closed cooling water circulation system for a shield machine. In addition, the utility model also relates to a tunnel boring equipment having an open-closed cooling water circulation system. Background Art

[0002] During tunneling, a shield machine generates significant heat in its hydraulic system, main drive, and power distribution systems. To prevent excessive temperatures in these systems and equipment from impacting progress, this heat must be removed promptly. Currently, in tunneling equipment technology, cooling circulating water systems are commonly used to cool heat-generating equipment. These systems include internal and external cooling water systems. The internal circulating water is pressurized by a water pump and used to cool the heat-generating equipment, while the external circulating water is used to cool the internal circulating water, equipment water, grouting, and other industrial water systems. A safe and reliable cooling water system is essential for the proper operation of the shield machine.

[0003] At present, the circulating water systems of most shield machines basically adopt an open system design. The open system has low pressure, low requirements on the pressure resistance level of components, and is easy to maintain. However, the water tank required by the open system is large. When the diameter of the shield machine is large or there is a small slope during excavation, the water at the highest level is easy to flow back when the system is shut down, the water tank is easy to overflow, the system is easy to run without water, and there are bubbles in the system operation. In addition, the open water tank is large in volume and heavy in weight, occupying the limited space of the shield machine and increasing the system cost. In addition, the head required by the water pump also increases with the increase of the slope, resulting in a waste of resources, such as CN209855789U and CN109209415B. Therefore, the open system is mainly suitable for horizontal tunnel excavation.

[0004] Currently, closed systems are primarily used in high-rise water supply, HVAC, water supply and drainage, and power plant cooling. However, there are few patents for closed system designs specifically for tunnel boring machine cooling water circulation systems. For example, CN220454035U provides a closed cooling water circulation system for steeply inclined TBMs, including an external circulating water system, a water replenishment device, an air supply device, a closed internal circulating water pump station, a cooling system, and a control panel. However, the presence of the internal circulating water tank in this patent often prevents the system from completely discharging gas, thus affecting the performance of the closed system. Furthermore, during actual construction, due to variations in geological conditions and working conditions, using only an open or closed system alone cannot meet tunneling requirements. Utility Model Content

[0005] The utility model provides an open and closed cooling water circulation system for a shield machine and tunnel boring equipment having the same, so as to solve the technical problems that the gas in the cooling water circulation system of the existing shield machine cannot be completely discharged, thereby affecting the performance of the closed system, and in the actual construction process, due to changes in geological conditions and working conditions, if only the open system or the closed system is used alone, it cannot meet the tunneling needs.

[0006] The technical solutions adopted in this utility model are as follows:

[0007] A shield machine open and closed cooling water circulation system comprises: a balancing water tank and an inner circulation water tank respectively connected to the atmosphere, a to-be-cooled group arranged in the shield machine to be water-cooled, an inner circulation water pump for supplying pumping pressure, a radiator for dissipating heat from the inner circulation water and the outer circulation water, and a pipe system that serves as a connection; the pipe system connects the balancing water tank, the inner circulation water tank, the inner circulation water pump, the to-be-cooled group and the radiator to form an open and closed cooling water circulation system, and by opening and closing relevant valves in the pipe system, the inner circulation water pump, the to-be-cooled group and the radiator are connected end to end in sequence to form a closed water circulation loop that shields and isolates the inner circulation water tank, or the inner circulation water tank, the inner circulation water pump, the to-be-cooled group and the radiator are connected end to end in sequence to form an open water circulation loop that shields and isolates the balancing water tank; the balancing water tank is located at the highest point of the setting position of the open and closed cooling water circulation system, and is connected to the lowest pressure point in the closed water circulation loop.

[0008] Furthermore, the piping system includes an internal circulation water inlet pipe, a heat dissipation branch pipe, a first return water branch pipe, and a first switch valve arranged in the first return water branch pipe; the two ends of the internal circulation water inlet pipe are respectively connected to the water outlet end of the internal circulation water pump and the water inlet end of the group to be cooled; the water inlet end of the heat dissipation branch pipe is connected to the water outlet end of the group to be cooled, the water outlet end of the heat dissipation branch pipe is connected to the water inlet end of the first return water branch pipe, the water outlet end of the first return water branch pipe is connected to the water inlet end of the internal circulation water pump, and the radiator is connected to the pipeline of the heat dissipation branch pipe; the internal circulation water pump, the group to be cooled and the radiator are connected end to end through the internal circulation water inlet pipe, the heat dissipation branch pipe and the first return water branch pipe arranged in sequence to form a closed water circulation loop.

[0009] Furthermore, the pipeline system also includes a water supply branch pipe and a second switch valve arranged in the water supply branch pipe; the water inlet end of the water supply branch pipe is connected to the balancing water tank, and the water outlet end of the water supply branch pipe is connected to the water inlet end of the first return water branch pipe.

[0010] Furthermore, the water inlet end of the water supply branch pipe is connected to the bottom end of the balancing water tank; the water outlet end of the water supply branch pipe is combined with the water outlet end of the heat dissipation branch pipe and then connected to the water inlet end of the first return water branch pipe.

[0011] Furthermore, the piping system also includes a second return water branch and an internal circulation water outlet pipe, a third switch valve arranged in the second return water branch pipe, and a fourth switch valve arranged in the internal circulation water outlet pipe; the water inlet end of the second return water branch pipe is connected to the water outlet end of the heat dissipation branch pipe, and the water outlet end of the second return water branch pipe is connected to the internal circulation water tank; the water inlet end of the internal circulation water outlet pipe is connected to the internal circulation water tank, and the water outlet end of the internal circulation water outlet pipe is connected to the water inlet end of the internal circulation water pump; the internal circulation water tank, the internal circulation water pump, the cooler group and the radiator are connected end to end through the internal circulation water outlet pipe, the internal circulation water inlet pipe, the heat dissipation branch pipe and the second return water branch pipe arranged in sequence to form an open water circulation loop.

[0012] Furthermore, the outlet end of the heat dissipation branch pipe, the outlet end of the water supply branch pipe and the inlet end of the second return water branch pipe are combined to form an integrated pipe; the third switch valve is located downstream of the integrated pipe and close to the return water port of the internal circulation water tank.

[0013] Furthermore, the water inlet end of the first return water branch pipe is connected to the integrated pipe, the water outlet end of the first return water branch pipe is merged with the water outlet end of the internal circulation outlet pipe, and the fourth switch valve is located in the pipeline before the internal circulation outlet pipe is merged.

[0014] Furthermore, the cooler group includes a main drive cooler, a gear oil cooler, a hydraulic oil cooler and a transformer cooler arranged in parallel in sequence, and the water inlet ends of the four are connected to the water outlet ends of the internal circulation water inlet pipe through branch pipes, and the water outlet ends of the four are connected to the water inlet ends of the heat dissipation branch pipes through branch pipes.

[0015] Furthermore, the first switch valve, the second switch valve, the third switch valve and the fourth switch valve are all ball valves or stop valves.

[0016] According to another aspect of the present invention, a tunnel boring equipment is provided, including a shield machine, wherein the shield machine is provided with an open and closed cooling water circulation system as described above.

[0017] The utility model has the following beneficial effects:

[0018] In order to solve the demand for open and closed cooling water circulation system of shield machine under variable working conditions and make up for the shortcomings of open system and closed system in existing schemes, the utility model proposes an open and closed cooling water circulation system for shield machine. As shown in the figure, the system first connects the balancing water tank, internal circulation water tank, internal circulation water pump, waiting cooler group and radiator through the pipeline system to form an open and closed cooling water circulation system. Then, by utilizing the opening and relationship of relevant valves in the pipeline system, the new open and closed cooling water circulation system can form an open water circulation loop for open operation or a closed water circulation loop for closed operation as needed to meet the needs of different shield excavation working conditions. The system can be operated in a closed mode, and open and closed modes can be switched freely. When the system is operated in a closed mode, the internal circulation water pump, the group of devices to be cooled and the radiator are connected end to end in sequence for circulation operation, and the internal circulation water tank is shielded and isolated, so that the residual gas in the system can be quickly discharged through the circuit with the balancing water tank connected to the lowest pressure point in the closed water circulation loop (the inlet of the internal circulation water pump in this new solution), thereby improving the stability of the closed circulation system; when the system is operated in an open mode, the internal circulation water tank, the internal circulation water pump, the group of devices to be cooled and the radiator are connected end to end for circulation operation, and the balancing water tank is shielded and isolated, thereby reducing the risk of water spraying from the balancing water tank.

[0019] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 This is a structural diagram of an open and closed cooling water circulation system for a shield machine according to a preferred embodiment of the present invention;

[0022] Figure 2 yes Figure 1 Schematic diagram of the closed water circulation loop formed in;

[0023] Figure 3 yes Figure 1 Schematic diagram of the open water circulation loop formed in.

[0024] Legend:

[0025] 1. Balancing water tank; 2. Internal circulation water tank; 3. Cooler group to be cooled; 31. Main drive cooler; 32. Gear oil cooler; 33. Hydraulic oil cooler; 34. Transformer cooler; 4. Internal circulation water pump; 5. Radiator; 61. Internal circulation water inlet pipe; 62. Heat dissipation branch pipe; 63. First return water branch pipe; 64. First on-off valve; 65. Water supply branch pipe; 66. Second on-off valve; 67. Second return water branch pipe; 68. Internal circulation water outlet pipe; 69. Third on-off valve; 71. Fourth on-off valve. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in a variety of different ways as defined and covered below.

[0027] Reference Figure 1 The preferred embodiment of the present invention provides an open-closed cooling water circulation system for a shield machine, comprising: a balancing water tank 1 and an internal circulation water tank 2, each of which is connected to the atmosphere; a to-be-cooled device group 3 provided on the shield machine for water cooling; an internal circulation water pump 4 for supplying pumping pressure; a radiator 5 for dissipating heat from the internal circulation water and the external circulation water; and a connecting pipe system. The pipe system connects the balancing water tank 1, the internal circulation water tank 2, the internal circulation water pump 4, the to-be-cooled device group 3, and the radiator 5 to form an open-closed cooling water circulation system. By opening and closing relevant valves in the pipe system, the internal circulation water pump 4, the to-be-cooled device group 3, and the radiator 5 are sequentially connected end to end to form a closed water circulation loop that shields and isolates the internal circulation water tank 2, or the internal circulation water tank 2, the internal circulation water pump 4, the to-be-cooled device group 3, and the radiator 5 are sequentially connected end to end to form an open water circulation loop that shields and isolates the balancing water tank 1. The balancing water tank 1 is located at the highest point of the open and closed cooling water circulation system and is connected to the lowest pressure point in the closed water circulation loop.

[0028] In order to solve the demand for open and closed cooling water circulation system of shield machine under variable working conditions and make up for the shortcomings of open system and closed system in existing schemes, this utility model proposes an open and closed cooling water circulation system for shield machine, such as Figure 1As shown, the system first connects the balancing water tank 1, the internal circulation water tank 2, the internal circulation water pump 4, the waiting cooler group 3 and the radiator 5 through the pipeline system to form an open and closed cooling water circulation system. Then, by using the opening and relationship of the relevant valves in the pipeline system, the new open and closed cooling water circulation system can form an open water circulation loop for open operation or a closed water circulation loop for closed operation as needed to meet the needs of different shield tunneling working conditions, and the open operation and closed operation can be switched freely. When the system is in closed operation, the internal circulation water pump 4, the waiting cooler group 3 and radiator 5 are connected end to end in sequence for circulation operation, and the inner circulation water tank 2 is shielded and isolated, so that the residual gas in the system can be quickly discharged through the loop with the balancing water tank 1 connected to the lowest pressure point in the closed water circulation loop (the inlet of the inner circulation water pump 4 in this new solution), thereby improving the stability of the closed circulation system; when the system is open for operation, the inner circulation water tank 2, the inner circulation water pump 4, the cooler group 3 and the radiator 5 are connected end to end in sequence for circulation operation, and the balancing water tank 1 is shielded and isolated, thereby reducing the risk of water spraying from the balancing water tank 1.

[0029] Alternatively, as Figure 1 and Figure 2 As shown, the piping system includes an internal circulation water inlet pipe 61, a heat dissipation branch pipe 62, a first return water branch pipe 63, and a first switch valve 64 arranged in the first return water branch pipe 63. The two ends of the internal circulation water inlet pipe 61 are respectively connected to the water outlet of the internal circulation water pump 4 and the water inlet of the to-be-cooled group 3. The water inlet end of the heat dissipation branch pipe 62 is connected to the water outlet end of the to-be-cooled group 3, the water outlet end of the heat dissipation branch pipe 62 is connected to the water inlet end of the first return water branch pipe 63, the water outlet end of the first return water branch pipe 63 is connected to the water inlet end of the internal circulation water pump 4, and the radiator 5 is connected to the piping of the heat dissipation branch pipe 62. The internal circulation water pump 4, the to-be-cooled group 3 and the radiator 5 are connected end to end through the internal circulation water inlet pipe 61, the heat dissipation branch pipe 62 and the first return water branch pipe 63 arranged in sequence to form a closed water circulation loop. When the system is working, the internal circulation water pump 4 is connected to the cooler group 3 through the internal circulation water inlet pipe 61, and the cooler group 3 is connected to the radiator 5 through the heat dissipation branch pipe 62. The radiator 5 is then connected to the internal circulation water pump 4 through the heat dissipation branch pipe 62 and the first return water branch pipe 63, thereby forming a closed circulation of internal water.

[0030] Furthermore, if Figure 1 and Figure 2 As shown, the piping system also includes a water supply branch 65 and a second switch valve 66 provided in the water supply branch 65. The water inlet end of the water supply branch 65 is connected to the balancing water tank 1, and the water outlet end of the water supply branch 65 is connected to the water inlet end of the first return water branch 63. In closed operation, the working process of the entire system is: internal circulation water pump 4 → waiting cooler group 3 → radiator 5 → internal circulation water pump 4, and the first switch valve 64 and the second switch valve 66 are both open, and the system operates as follows: Figure 2As shown, the internal circulation water tank 2 is now in a shielded state, and the balancing water tank 1 is connected to the suction port of the internal circulation water pump 4. In this closed operating system, the balancing water tank 1 is located at the highest point of the open-closed cooling water circulation system and is connected to the lowest point of pressure within the open-closed cooling water circulation system, namely the front suction port of the internal circulation water pump 4. This achieves constant pressure for the entire closed system and replenishment and exhaust of the closed water circulation loop. This operating mode is suitable for working conditions with varying elevations, such as shield tunneling and climbing, and because the gas in the loop is quickly exhausted, it can effectively improve the stability of the closed circulation system.

[0031] Preferably, if Figure 2 As shown, the inlet end of the water supply branch pipe 65 is connected to the bottom end of the balancing water tank 1, so that all the water in the balancing water tank 1 can be replenished into the closed water circulation loop. The outlet end of the water supply branch pipe 65 is combined with the outlet end of the heat dissipation branch pipe 62 and then connected to the inlet end of the first return water branch pipe 63, thereby simplifying the piping structure and reducing system costs.

[0032] Alternatively, as Figure 1 and Figure 3 As shown, the piping system also includes a second return branch pipe 67 and an internal circulation outlet pipe 68, a third on-off valve 69 disposed in the second return branch pipe 67, and a fourth on-off valve 71 disposed in the internal circulation outlet pipe 68. The water inlet of the second return branch pipe 67 is connected to the water outlet of the heat dissipation branch pipe 62, and the water outlet of the second return branch pipe 67 is connected to the internal circulation water tank 2. The water inlet of the internal circulation outlet pipe 68 is connected to the internal circulation water tank 2, and the water outlet of the internal circulation outlet pipe 68 is connected to the water inlet of the internal circulation water pump 4. The internal circulation water tank 2, the internal circulation water pump 4, the to-be-cooled unit 3, and the radiator 5 are connected end-to-end via the internal circulation outlet pipe 68, the internal circulation inlet pipe 61, the heat dissipation branch pipe 62, and the second return branch pipe 67, which are disposed in that order, to form an open water circulation loop.

[0033] In open operation, the working process of the entire system is: internal circulation water tank 2 → internal circulation water pump 4 → cooler group 3 → radiator 5 → internal circulation water tank 2. The first switch valve 64 and the second switch valve 66 are both closed, the third switch valve 69 and the fourth switch valve 71 are both open, and the system operates as follows. Figure 3 As shown, the balancing water tank 1 is in a shielding state at this time, thereby reducing the risk of water spraying from the balancing water tank 1. This mode is suitable for shield horizontal tunnel excavation conditions.

[0034] Preferably, if Figure 3 As shown, the outlet of the heat dissipation branch pipe 62, the outlet of the water replenishment branch pipe 65, and the inlet of the second return water branch pipe 67 are combined into an integrated pipe, thereby simplifying the piping structure and reducing system costs. The third on-off valve 69 is located downstream of the integrated pipe, near the return water inlet of the internal circulation water tank 2, to control the second return water branch pipe 67.

[0035] Preferably, if Figure 1 As shown, the water inlet end of the first return water branch pipe 63 is connected to the integrated pipe, and the water outlet end of the first return water branch pipe 63 is merged with the water outlet end of the internal circulation outlet pipe 68, thereby simplifying the pipeline structure and reducing the system cost; and the fourth switch valve 71 is located in the pipeline before the internal circulation outlet pipe 68 is merged, so as to control the connection between the internal circulation water tank 2 and the internal circulation water pump 4.

[0036] Alternatively, as Figure 1 As shown, the equipment group 3 to be cooled includes a main drive cooler 31, a gear oil cooler 32, a hydraulic oil cooler 33, and a transformer cooler 34, which are arranged in parallel. The water inlets of these four coolers are connected to the water outlets of the internal circulation water inlet pipe 61 via branch pipes, and the water outlets of these four coolers are connected to the water inlet of the heat dissipation branch pipe 62 via branch pipes. In this embodiment, the equipment group 3 to be cooled has four cooling branches, each containing one type of equipment cooler. In other applications, the number of cooling branches and the type and quantity of equipment coolers can be other values.

[0037] Optionally, the first switch valve 64, the second switch valve 66, the third switch valve 69 and the fourth switch valve 71 are all ball valves or stop valves. In this optional solution, the first switch valve 64, the second switch valve 66, the third switch valve 69 and the fourth switch valve 71 are all pneumatic ball valves.

[0038] A preferred embodiment of the present invention also provides a tunnel boring equipment, including a shield machine, which is equipped with an open and closed cooling water circulation system as described above, so that an open water circulation loop for open operation or a closed water circulation loop for closed operation can be formed in the tunnel boring equipment of the present invention as needed to meet the needs of different shield boring working conditions, and the open operation and closed operation can be switched freely. When the system is in closed operation, the residual gas in the circuit with the balancing water tank 1 of the system can be quickly discharged, thereby improving the stability of the closed circulation system. When the system is in open operation, the balancing water tank 1 can be shielded and isolated, thereby reducing the risk of water spraying from the balancing water tank 1.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A shield machine open and closed cooling water circulation system, characterized in that: include: A balancing water tank (1) and an internal circulation water tank (2) respectively connected to the atmosphere, a cooling device group (3) provided on the shield machine for water cooling, an internal circulation water pump (4) for supplying pumping pressure, a radiator (5) for dissipating heat from the internal circulation water and the external circulation water, and a connecting pipe system; The piping system connects the balancing water tank (1), the internal circulation water tank (2), the internal circulation water pump (4), the group of devices to be cooled (3) and the radiator (5) to form an open-close cooling water circulation system, and by opening and closing the relevant valves in the piping system, the internal circulation water pump (4), the group of devices to be cooled (3) and the radiator (5) are connected end to end in sequence to form a closed water circulation loop that shields and isolates the internal circulation water tank (2), or the internal circulation water tank (2), the internal circulation water pump (4), the group of devices to be cooled (3) and the radiator (5) are connected end to end in sequence to form an open water circulation loop that shields and isolates the balancing water tank (1); The balancing water tank (1) is located at the highest point of the setting position of the open and closed cooling water circulation system and is connected to the lowest pressure point in the closed water circulation loop.

2. The shield machine open and closed cooling water circulation system according to claim 1, characterized in that: The pipeline system includes an internal circulation water inlet pipe (61), a heat dissipation branch pipe (62), a first water return branch pipe (63), and a first switch valve (64) arranged in the first water return branch pipe (63); The two ends of the internal circulation water inlet pipe (61) are respectively connected to the water outlet of the internal circulation water pump (4) and the water inlet of the to-be-cooled device group (3); The water inlet end of the heat dissipation branch pipe (62) is connected to the water outlet end of the to-be-cooled device group (3), the water outlet end of the heat dissipation branch pipe (62) is connected to the water inlet end of the first return water branch pipe (63), the water outlet end of the first return water branch pipe (63) is connected to the water inlet end of the internal circulation water pump (4), and the radiator (5) is connected to the pipeline of the heat dissipation branch pipe (62); The internal circulation water pump (4), the to-be-cooled device group (3) and the radiator (5) are connected end to end through the internal circulation water inlet pipe (61), the heat dissipation branch pipe (62) and the first return water branch pipe (63) which are arranged in sequence to form a closed water circulation loop.

3. The shield machine open and closed cooling water circulation system according to claim 2, characterized in that: The pipeline system further includes a water supply branch pipe (65) and a second switch valve (66) arranged in the water supply branch pipe (65); The water inlet end of the water supply branch pipe (65) is connected to the balancing water tank (1), and the water outlet end of the water supply branch pipe (65) is connected to the water inlet end of the first return water branch pipe (63).

4. The shield machine open and closed cooling water circulation system according to claim 3, characterized in that: The water inlet end of the water supply branch pipe (65) is connected to the bottom end of the balancing water tank (1); The water outlet end of the water supply branch pipe (65) is connected to the water inlet end of the first water return branch pipe (63) after being combined with the water outlet end of the heat dissipation branch pipe (62).

5. The shield machine open and closed cooling water circulation system according to claim 3, characterized in that: The pipeline system further includes a second water return branch pipe (67) and an internal circulation water outlet pipe (68), a third switch valve (69) arranged in the second water return branch pipe (67), and a fourth switch valve (71) arranged in the internal circulation water outlet pipe (68). The water inlet end of the second water return branch pipe (67) is connected to the water outlet end of the heat dissipation branch pipe (62), and the water outlet end of the second water return branch pipe (67) is connected to the internal circulation water tank (2); The water inlet end of the internal circulation water outlet pipe (68) is connected to the internal circulation water tank (2), and the water outlet end of the internal circulation water outlet pipe (68) is connected to the water inlet end of the internal circulation water pump (4); The internal circulation water tank (2), the internal circulation water pump (4), the to-be-cooled unit (3) and the radiator (5) are connected end to end through the internal circulation water outlet pipe (68), the internal circulation water inlet pipe (61), the heat dissipation branch pipe (62) and the second return water branch pipe (67) which are arranged in sequence to form an open water circulation loop.

6. The shield machine open and closed cooling water circulation system according to claim 5, characterized in that: The water outlet end of the heat dissipation branch pipe (62), the water outlet end of the water supply branch pipe (65) and the water inlet end of the second water return branch pipe (67) are combined to form an integrated pipe; The third switch valve (69) is located downstream of the integrated pipe and close to the return water port of the internal circulation water tank (2).

7. The shield machine open and closed cooling water circulation system according to claim 6, characterized in that: The water inlet end of the first water return branch pipe (63) is connected to the integrated pipe, the water outlet end of the first water return branch pipe (63) is merged with the water outlet end of the internal circulation water outlet pipe (68), and the fourth switch valve (71) is located in the pipeline before the internal circulation water outlet pipe (68) is merged.

8. The shield machine open and closed cooling water circulation system according to claim 3, characterized in that: The cooler group (3) includes a main drive cooler (31), a gear oil cooler (32), a hydraulic oil cooler (33) and a transformer cooler (34) which are sequentially connected in parallel, and the water inlets of the four are connected to the water outlets of the internal circulation water inlet pipe (61) through branch pipes, and the water outlets of the four are connected to the water inlet of the heat dissipation branch pipe (62) through branch pipes.

9. The shield machine open and closed cooling water circulation system according to claim 5, characterized in that: The first on-off valve (64), the second on-off valve (66), the third on-off valve (69) and the fourth on-off valve (71) are all ball valves or stop valves.

10. A tunnel boring device, characterized in that: The invention comprises a shield machine, wherein the shield machine is provided with an open and closed cooling water circulation system as claimed in any one of claims 1 to 9.

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