Metro shield construction stirring all-in-one machine

Abstract

A metro shield construction stirring all-in-one machine comprises a vehicle body, and a material storage unit, a conveying unit and a stirring machine are installed on the vehicle body. The number of the vehicle bodies is two. The storage unit comprises an aggregate storage bin, a powder storage bin and a water tank; the conveying unit comprises a conveying belt, a spiral feeder and a water pump; the water pump pumps water in the water tank into the stirrer through a water pipe; a concrete conveying pump is installed on a concrete conveying pipe connected to a discharging opening of the stirring machine. According to the embodiment of the utility model, the mixer, the storage bin and the conveyor are integrally arranged on the vehicle body, the vehicle body is connected to the rear end of the shield tunneling machine, and concrete is mixed and supplied on site on the rear side of the shield tunneling machine along with advancing of the shield tunneling machine in a built tunnel, so that the concrete conveying distance is shortened, long-distance emptying of a conveying pipeline is not needed, and the working efficiency is improved. Concrete waste is reduced, concrete supply is timely, waiting time is avoided, construction continuity is improved, and construction efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of mixing equipment, and in particular relates to an all-in-one mixing machine for subway shield construction. Background Art

[0002] As is known to all, in the existing subway shield construction process, after the subway tunnel segments are installed, it is necessary to immediately fill the segments and the shield layer with concrete, and the filling process is carried out synchronously with the shield machine. In the prior art, the concrete is generally mixed on the ground in advance, and then the concrete is transported to the segment installation location at the forefront of the shield through a two-stage pumping system for filling. The conveying pipeline is very long and requires a lot of personnel. And when the shield machine suddenly fails, in order to avoid the concrete solidifying and clogging the pipeline of the conveying system, all the concrete in the entire conveying pipeline can only be emptied and processed, which wastes resources and labor. In addition, since the shield machine construction requires the material transport vehicle to go back and forth to discharge slag, this process is intermittent. Each waiting time also requires the pipeline to be emptied, which also wastes concrete. This construction method is relatively backward, with low production efficiency, poor continuity, and low reliability. Utility Model Content

[0003] In view of the deficiencies existing in the related technologies, the utility model provides a subway shield construction mixing machine to solve the problems of long pipelines, intermittent and low efficiency caused by long-distance transportation of concrete in current subway tunnel shield construction.

[0004] The utility model provides a subway shield construction mixing integrated machine, comprising a vehicle body, on which a material storage unit, a conveying unit and a mixer are installed;

[0005] The vehicle body has two parts, including a first vehicle body and a second vehicle body, the rear end of the first vehicle body is connected to the front end of the second vehicle body through a connecting mechanism, and the first vehicle body and the second vehicle body are both rail vehicles;

[0006] The storage unit includes an aggregate storage bin and a powder storage bin, and both the aggregate storage bin and the powder storage bin are located in the second vehicle body;

[0007] The conveying unit includes a conveyor belt and a screw feeder. A plurality of conveyor belts are sequentially arranged from the bottom of the aggregate storage bin to the top of the mixer. A plurality of screw feeders are sequentially arranged from the bottom of the powder storage bin to the top of the mixer.

[0008] The storage unit further includes a water tank, and the conveying unit further includes a water pump. The water tank and the water pump are both located below the corresponding conveyor belt or screw feeder at the rear side of the mixer, and the water pump pumps the water in the water tank into the mixer through a water pipe;

[0009] The discharge port of the mixer is connected to a concrete delivery pipe, and a concrete delivery pump is installed on the concrete delivery pipe to pump the concrete in the mixer to the shield machine through the discharge port and the concrete delivery pipe.

[0010] In some of the embodiments, the aggregate storage bin and the powder storage bin are located at the front and rear of the second vehicle body, respectively;

[0011] The conveyor belt includes a first conveyor belt and a second conveyor belt, and the screw feeder includes a first screw feeder, a second screw feeder and a third screw feeder;

[0012] The first conveyor belt and the first screw feeder are both obliquely installed on the first vehicle body, so that the front ends of the first conveyor belt and the first screw feeder extend above the mixer, and the rear ends of the first conveyor belt and the first screw feeder extend into the gap between the first vehicle body and the second vehicle body;

[0013] The second conveyor belt is tiltedly arranged below the aggregate storage bin so that its front end extends above the rear end of the first conveyor belt. The second screw feeder is tiltedly arranged at the front of the second vehicle body so that its front end extends above the first screw feeder. The third screw feeder is tiltedly arranged below the powder storage bin so that its front end extends above the rear end of the second screw feeder.

[0014] In some of the embodiments, the screw feeder and the conveyor belt are respectively arranged on the left and right sides of the vehicle body.

[0015] In some embodiments, the aggregate storage bin is connected to a corresponding conveyor belt below it, and the top surface of the conveyor belt is gap-matched with the aggregate discharge port opened at the bottom end of the aggregate storage bin;

[0016] The powder storage bin is connected to a corresponding screw feeder below it, and a feed pipe arranged on the shell of the screw feeder is connected to a powder discharge port opened at the bottom end of the powder storage bin.

[0017] In some of the embodiments, the aggregate storage bin and the powder storage bin are both hoisted on the second vehicle body via weight sensors.

[0018] In some of the embodiments, a discharge pipe is provided at the front end of the shell of a screw feeder corresponding to a powder storage bin below the powder storage bin, and a pneumatic butterfly valve is installed on the discharge pipe to control its opening and closing.

[0019] In some of the embodiments, two powder discharge ports are arranged at the front and rear ends of the bottom of the powder storage bin, and two corresponding feed pipes are arranged.

[0020] In some of the embodiments, a flow meter is installed on the water pipe.

[0021] In some of the embodiments, a protective cover is installed on the front end of a conveyor belt corresponding to the rear side of the mixer.

[0022] In some of the embodiments, the connecting mechanism includes a connecting arm and two connecting pins installed at two ends of the connecting arm, so as to hinge the two ends of the connecting arm to the first vehicle body and the second vehicle body respectively.

[0023] Based on the above technical scheme, in the embodiment of the utility model, the mixer, storage bin and conveyor are integrated on the vehicle body, and the vehicle body is connected to the rear end of the shield machine. As the shield machine moves in the built tunnel, concrete is mixed and supplied on site at the rear side of the shield machine, shortening the distance of concrete transportation, eliminating the need to empty long-distance transportation pipelines, reducing concrete waste, and ensuring timely concrete supply without waiting time, thereby improving construction continuity and construction efficiency, and solving the problems of long pipelines, intermittent construction and low efficiency caused by long-distance concrete transportation in current subway tunnel shield construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0025] Figure 1 This is a schematic diagram of the structure of the utility model subway shield construction mixing machine Figure 1 ;

[0026] Figure 2 This is a schematic diagram of the structure of the utility model subway shield construction mixing machine Figure 2 ;

[0027] In the figure:

[0028] 1. Vehicle body; 11. First vehicle body; 12. Second vehicle body;

[0029] 2. Storage unit; 21. Aggregate storage bin; 211. Aggregate discharge port; 22. Powder storage bin; 221. Powder discharge port; 23. Water tank;

[0030] 3. Conveying unit; 31. Conveying belt; 31A. First conveying belt; 31B. Second conveying belt; 32. Screw feeder; 32A. First screw feeder; 32B. Second screw feeder; 32C. Third screw feeder; 321. Feed pipe; 322. Discharge pipe; 33. Water pump;

[0031] 4. Mixer; 41. Feeding port; 5. Pneumatic butterfly valve; 6. Flow meter; 7. Protective cover;

[0032] 8. Connecting mechanism; 81. Connecting arm; 82. Connecting pin. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Thus, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] like Figure 1 to Figure 2 As shown, in an illustrative embodiment of the subway shield construction mixing machine of the utility model, the subway shield construction mixing machine includes a vehicle body 1, on which a material storage unit 2, a conveying unit 3 and a mixer 4 are installed.

[0038] The vehicle body 1 has two parts, including a first vehicle body 11 and a second vehicle body 12. The rear end of the first vehicle body 11 is connected to the front end of the second vehicle body 12 via a connecting mechanism 8. Both the first vehicle body 11 and the second vehicle body 12 are rail vehicles.

[0039] The storage unit 2 includes an aggregate storage bin 21, a powder storage bin 22 and a water tank 23. The aggregate storage bin 21, the powder storage bin 22 and the water tank 23 respectively store aggregates, powders and water required for concrete. The aggregate storage bin 21 and the powder storage bin 22 are both located in the second vehicle body 12, and the water tank 23 is located in the first vehicle body 11.

[0040] The conveying unit 3 includes a conveyor belt 31, a screw feeder 32 and a water pump 33. A plurality of conveyor belts 31 are sequentially arranged from below the aggregate storage bin 21 to above the mixer 4. A plurality of screw feeders 32 are sequentially arranged from below the powder storage bin 22 to above the mixer 4. The water tank 23 and the water pump 33 are both located below the corresponding conveyor belt 31 or screw feeder 32 at the rear side of the mixer 4. The water pump 33 delivers the water in the water tank 23 to the mixer 4 through a water pipe. The concrete delivery pipe is connected to the discharge port of the mixer 4, and a concrete delivery pump is installed on the concrete delivery pipe.

[0041] The shield machine excavates forward in the tunnel, installs pipe segments to support the subway tunnel, and installs tracks to enable the shield machine to move smoothly. Both car bodies 1 of the subway shield construction mixing machine are rail cars, located on the track where the shield machine is located. The front end of the first car body 11 is connected to the rear end of the shield machine. As the shield machine moves forward, the shield machine pulls the subway shield construction mixing machine to move forward synchronously along the track.

[0042] Since the storage unit 2, conveying unit 3 and mixer 4 are installed on the car body 1, there are many devices. Two car bodies 1 are used to install the aforementioned devices respectively, reducing the turning radius of the subway shield construction mixer and ensuring its turning flexibility when the shield machine moves.

[0043] Aggregates stored in the aggregate storage bin 21 are put on the conveyor belt 31 below it, and are sequentially transported to the top of the mixer 4 through the subsequent conveyor belt 31, so that the aggregates are sent into the mixer 4 through the feeding port 41 opened at the top of the mixer 4. Powders stored in the powder storage bin 22 are put on the screw feeder 32 below it, and are sequentially transported to the top of the mixer 4 through the subsequent screw feeder 32, so that the powders are sent into the mixer 4 through the feeding port 41 opened at the top of the mixer 4. The water pump 33 pumps the water in the water tank 23 into the mixer 4 through the water pipe, and the powders, aggregates and water are mixed and stirred in the mixer 4 to form concrete. The shield machine is located at the front side of the first vehicle body 11, and the mixer 4 is located at the front end of the first vehicle body 11. After the concrete is mixed in the mixer 4, the mixer 4 opens its discharge port, and the concrete is discharged into the connected concrete delivery pipe, and the concrete is delivered to the shield machine by the concrete delivery pump, so that the concrete is delivered to the space between the segment and the shield layer dug by the shield machine. Since the mixer 4 is adjacent to the rear end of the shield machine, the length of the required concrete delivery pipe is short, and the required concrete can be provided to the shield machine in time, so as to quickly fill the space between the segment and the shield layer, and due to the short length, the concrete in the concrete delivery pipe can be fully delivered to the shield machine without emptying.

[0044] Among the various materials required in concrete, the demand for granular aggregates is relatively large. The conveyor belt 31 is used to convey the aggregates. Compared with the screw feeder 32, the conveyor belt 31 has a higher conveying efficiency and can feed the aggregates with a larger component content in the concrete into the mixer 4 per unit time. Powders such as cement are easy to fly up under the action of airflow. The screw feeder 32 has a pipe-shaped shell and a screw rod installed in the shell. The rotating screw rod pushes the powder to move axially in the shell through its spiral blades to realize the conveying of the powder. The powder is not easily blown up by the airflow in the shell, avoiding the loss of the powder during the conveying process.

[0045] The front ends of the conveyor belt 31 and the screw feeder 32 on the first car body 11 extend above the mixer 4, so that the conveyor belt 31 and the screw feeder 32 adjacent to the mixer 4 are tilted, thereby forming a space under the conveyor belt 31 and the screw feeder 32 to accommodate the water tank 23 and the water pump 33, thereby improving the space utilization rate on the car body 1 and making the structure of the subway shield construction mixing machine more compact.

[0046] When the mixer 4 is mixing concrete, aggregate, powder and water can be added to the aggregate storage bin 21, the powder storage bin 22 and the water tank 23 respectively to ensure the supply of raw materials for the next wave of concrete mixing, thereby ensuring the continuity of concrete supply.

[0047] In the above-mentioned schematic embodiment, the subway shield construction mixing machine integrates the mixer, storage bin and conveyor on the vehicle body, and the vehicle body is connected to the rear end of the shield machine. As the shield machine moves in the built tunnel, concrete is mixed and supplied on site at the rear side of the shield machine, shortening the distance of concrete transportation, eliminating the need to empty long-distance transportation pipelines, reducing concrete waste, and ensuring timely concrete supply without waiting time, thereby improving construction continuity and construction efficiency, and solving the problems of long pipelines, intermittent construction and low efficiency caused by long-distance concrete transportation in current subway tunnel shield construction.

[0048] In some embodiments, the aggregate storage bin 21 and the powder storage bin 22 are located at the front and rear of the second vehicle body 12 respectively.

[0049] The conveyor belt 31 includes a first conveyor belt 31A and a second conveyor belt 31B, and the screw feeder 32 includes a first screw feeder 32A, a second screw feeder 32B, and a third screw feeder 32C.

[0050] The first conveyor belt 31A and the first screw feeder 32A are both installed obliquely on the first vehicle body 11, so that the front ends of the first conveyor belt 31A and the first screw feeder 32A extend above the mixer 4, and the rear ends of the first conveyor belt 31A and the first screw feeder A32 extend into the gap between the first vehicle body 11 and the second vehicle body 12.

[0051] The second conveyor belt 31B is tiltedly arranged below the aggregate storage bin 21, so that its front end extends above the rear end of the first conveyor belt 31A, the second screw feeder 32B is tiltedly arranged at the front of the second vehicle body 12, so that its front end extends above the first screw feeder 32A, and the third screw feeder 32C is tiltedly arranged below the powder storage bin 22, so that its front end extends above the rear end of the second screw feeder 32B.

[0052] Aggregates in the aggregate storage bin 21 fall onto the second conveyor belt 31B, are transported forward to the front end thereof by the second conveyor belt 31B, fall onto the rear end of the first conveyor belt 31A, are further transported forward to the top of the mixer 4 by the first conveyor belt 31A, and fall into the mixer 4. The powder in the powder storage bin 22 falls into the feed pipe 321 of the third screw feeder 32C, enters the interior of its shell, is pushed forward by the rotating screw rod, is discharged from the discharge pipe 322 at the front end of the third screw feeder 32C, falls into the feed pipe 321 of the second screw feeder 32B, is further transported forward by the second screw feeder 32B, is discharged from the discharge pipe 322 at the front end of the second screw feeder 32B, falls into the feed pipe 321 of the first screw feeder 32A, is further transported forward by the first screw feeder 32A, is discharged from the discharge pipe 322 at the front end of the first screw feeder 32A, and falls into the mixer 4.

[0053] The aggregate storage bin 21 and the powder storage bin 22 are arranged front and back, making full use of the length space of the second vehicle body 12, and maximizing the volume of the aggregate storage bin 21 and the powder storage bin 22 when the width of the second vehicle body 12 is fixed. Since the aggregate content in concrete is relatively large, the aggregate storage bin 21 is arranged at the front side, which can shorten the conveying distance of the aggregate, convey more aggregate to the mixer 4 per unit time, so that various materials in the concrete can be supplied to the mixer 4 per unit time, and then the concrete can be mixed earlier, thereby improving the production efficiency of the concrete. The conveyor belt 31 and the screw feeder 32 are both arranged at an angle, which can make full use of the height space of the vehicle body, reduce the space occupied by the conveyor belt 31 and the screw feeder 32 in the length direction, thereby shortening the length of the vehicle body and reducing the volume of the subway shield construction mixing machine. In addition, the conveyor belt 31 and the screw feeder 32 are inclined, so that the front end is located at a high position, which is convenient for setting it above the mixer 4, and facilitating the aggregate and powder to be put into the mixer 4 through the feeding port 41 at the top.

[0054] In some embodiments, the screw feeder 32 and the conveyor belt 31 are respectively arranged on the left and right sides of the vehicle body 1, so that the aggregate is conveyed from the back to the front to the mixer 4 on the right side, and the powder is conveyed from the back to the front to the mixer 4 on the left side. The conveyor belt 31 and the screw feeder 32 are arranged on the left and right sides, which fully utilizes the width space of the vehicle body 1 and improves the compactness of the structure of the subway shield construction mixing machine.

[0055] In some embodiments, the aggregate storage bin 21 is connected to a corresponding conveyor belt 31 below it, and the top surface of the conveyor belt 31 is gap-matched with the aggregate discharge port 211 opened at the bottom of the aggregate storage bin 21. The powder storage bin 22 is connected to a corresponding screw feeder 32 below it, and the feed pipe 321 provided on the shell of the screw feeder 32 is connected to the powder discharge port 221 opened at the bottom of the powder storage bin 22.

[0056] Aggregates in the aggregate storage bin 21 fall onto the belt body of the conveyor belt 31 below through the aggregate discharge port 211. Since the gap between the conveyor belt 31 and the aggregate discharge port 211 of the aggregate storage bin 21 is small, when the conveyor belt 31 is in a stationary state, when the aggregates on the belt body are piled up to the aggregate discharge port 211, subsequent aggregates will not be able to be discharged through the aggregate discharge port 211, so that the belt body of the conveyor belt 31 can block and close the aggregate discharge port 211 to a certain extent. When the conveyor belt 31 is running, the aggregates falling onto the belt body from the aggregate discharge port 211 are transported forward by the conveyor belt 31, eliminating the blockage of the aggregate discharge port 211, so that subsequent aggregates continue to fall onto the belt body and are transported forward by the belt body. The gap between the aggregate storage bin 21 and the conveyor belt 31 below is matched, and the aggregate outlet 211 does not need to be separately provided with a valve for opening and closing. The aggregate can be conveyed forward by starting the conveyor belt 31 without a conveying interval, thereby reducing equipment costs and improving the continuity of aggregate conveying.

[0057] When the screw feeder 32 below the powder storage bin 22 is in a stationary state, the powder falls into the housing of the screw feeder 32 through the powder discharge port 221 and the feed pipe 321, and is located between the spiral blades directly facing the spiral rod and the feed pipe 321. When the screw feeder 32 is in operation, the spiral rod rotates, pushing the powder entering the housing to be transported forward along the axial direction of the housing, and allowing subsequent powder to enter the housing through the feed pipe 321. In the case where the powder discharge port 221 is not provided with a valve that is separately set to open and close, the powder can be continuously transported without a transport interval, thereby reducing equipment costs and improving the continuity of powder transportation.

[0058] In some embodiments, the aggregate storage bin 21 and the powder storage bin 22 are hoisted on the second vehicle body 12 through weight sensors (not shown in the drawings). The aggregate storage bin 21, the aggregate inside it, and a connected conveyor belt 31 are weighed in real time through a set of weight sensors, and the powder storage bin 22, the powder inside it, and a connected screw feeder 32 are weighed in real time through another set of weight sensors. According to the weight change value, the weight of the overall output aggregate and the weight of the powder are obtained to control the content of the aggregate and the content of the powder put into the mixer 4. The content is controlled by weighing, the structure is simple and the equipment is small, and too much equipment is avoided to control the content and occupy the vehicle body space.

[0059] In some embodiments, a discharge pipe 322 is provided at the front end of the shell of a corresponding screw feeder 32 below the powder storage bin 22, and a pneumatic butterfly valve 5 is installed on the discharge pipe 322 to control its opening and closing. After the screw feeder 32 has been running for a period of time, the powder will fill the internal space of the shell of the screw feeder 32. If the operation of the screw feeder 32 is stopped at this time, the powder reaching the front end of the internal space of the shell will still be discharged through the discharge pipe 322, and it is impossible to completely stop the powder conveying when the screw feeder 32 stops running. When the screw feeder 32 stops running, the pneumatic butterfly valve 5 closes the discharge pipe 322, so that the powder reaching the front end of the internal space of the shell is retained inside it, achieving the effect of immediately stopping the powder conveying, thereby improving the accuracy of the output and the amount of powder fed into the mixer 4.

[0060] In some embodiments, two powder outlets 221 are provided at the front and rear of the bottom of the powder storage bin 22, and two corresponding feed pipes 321 are provided. The two powder outlets 221 can synchronously convey powder into the shell of the screw feeder 32 below, so that a part of the powder can be conveyed forward from the middle of the shell, reducing the distance that the powder moves on the screw feeder 32 below, thereby improving the conveying efficiency.

[0061] In some embodiments, a flow meter 6 is installed on the water pipe, so that the total amount of water pumped by the water pump 33 is obtained according to the flow meter 6 to control the water content put into the mixer 4 to ensure that the content ratio of various components of concrete in the mixer 4 meets the set requirements.

[0062] In some embodiments, a protective cover 7 is installed on the front end of a conveyor belt 31 corresponding to the rear side of the mixer 4. The rear side of the protective cover 7 is open, and the front end of the conveyor belt 31 extends into the protective cover 7, thereby forming an arc-shaped space between the inner wall of the protective cover 7 and the front end of the conveyor belt 31. One end of the space is open to the rear and the other end is downward, guiding the material to fall through the space to the mixer 4, so as to prevent the aggregate from being thrown forward of the conveyor belt 31 and injuring people or damaging other equipment on the front side when the conveyor belt 31 runs too fast.

[0063] In some embodiments, the connection mechanism 8 includes a connection arm 81 and two connection pins 82 installed at both ends of the connection arm 81, and the two ends of the connection arm 81 are respectively hinged to the first vehicle body 11 and the second vehicle body 12 through the two connection pins 82. When the shield machine pulls the first vehicle body 11 to move forward, the first vehicle body 11 pulls the second vehicle body 12 to move along with it through the connection pins 82, and the two ends of the connection pins 82 are hinged to ensure that the first vehicle body 11 can flexibly turn relative to the second vehicle body 12.

[0064] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0065] The above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for which protection is requested in the utility model.

Claims

1. A subway shield construction mixing machine, characterized in that: The vehicle comprises a vehicle body, on which a material storage unit, a conveying unit and a mixer are installed. The vehicle body has two parts, including a first vehicle body and a second vehicle body, the rear end of the first vehicle body is connected to the front end of the second vehicle body through a connecting mechanism, and the first vehicle body and the second vehicle body are both rail vehicles; The storage unit comprises an aggregate storage bin and a powder storage bin, and both the aggregate storage bin and the powder storage bin are located in the second vehicle body; The conveying unit includes a conveyor belt and a screw feeder, wherein a plurality of conveyor belts are sequentially arranged from below the aggregate storage bin to above the mixer, and a plurality of screw feeders are sequentially arranged from below the powder storage bin to above the mixer; The material storage unit further includes a water tank, and the conveying unit further includes a water pump. The water tank and the water pump are both located at the rear side of the mixer and below the conveyor belt or the screw feeder. The water pump pumps the water in the water tank into the mixer through a water pipe. The discharge port of the mixer is connected to a concrete delivery pipe, and a concrete delivery pump is installed on the concrete delivery pipe to pump the concrete in the mixer to the shield machine through the discharge port and the concrete delivery pipe.

2. The subway shield construction mixing machine according to claim 1, characterized in that: The aggregate storage bin and the powder storage bin are respectively located at the front and rear of the second vehicle body; The conveyor belt includes a first conveyor belt and a second conveyor belt, and the screw feeder includes a first screw feeder, a second screw feeder and a third screw feeder; The first conveyor belt and the first screw feeder are both obliquely installed on the first vehicle body, so that the front ends of the first conveyor belt and the first screw feeder extend above the mixer, and the rear ends of the first conveyor belt and the first screw feeder extend into the gap between the first vehicle body and the second vehicle body; The second conveyor belt is tiltedly arranged below the aggregate storage bin so that its front end extends above the rear end of the first conveyor belt, the second screw feeder is tiltedly arranged at the front of the second vehicle body so that its front end extends above the first screw feeder, and the third screw feeder is tiltedly arranged below the powder storage bin so that its front end extends above the rear end of the second screw feeder.

3. The subway shield construction mixing machine according to claim 1, characterized in that: The screw feeder and the conveyor belt are respectively arranged on the left and right sides of the vehicle body.

4. The subway shield construction mixing machine according to claim 1, characterized in that: The aggregate storage bin is connected to a corresponding conveyor belt below it, and the top surface of the conveyor belt is in clearance with the aggregate discharge port opened at the bottom end of the aggregate storage bin; The powder storage bin is connected to a corresponding screw feeder below it, and a feed pipe provided on the shell of the screw feeder is communicated with a powder discharge port opened at the bottom end of the powder storage bin.

5. The subway shield construction mixing machine according to claim 4, characterized in that: The aggregate storage bin and the powder storage bin are both hoisted on the second vehicle body via weight sensors.

6. The subway shield construction mixing machine according to claim 5, characterized in that: A discharge pipe is arranged at the front end of the shell of the spiral feeder corresponding to the powder material storage bin below the powder material storage bin, and a pneumatic butterfly valve is installed on the discharge pipe to control its opening and closing.

7. The subway shield construction mixing machine according to claim 4, characterized in that: Two powder discharge ports are arranged at the front and rear of the bottom of the powder storage bin, and two feed pipes are arranged correspondingly.

8. The subway shield construction mixing machine according to claim 1, characterized in that: A flow meter is installed on the water pipe.

9. The subway shield construction mixing machine according to claim 1, characterized in that: A protective cover is installed on the front end of a conveyor belt corresponding to the rear side of the mixer.

10. The subway shield construction mixing machine according to claim 1, characterized in that: The connecting mechanism comprises a connecting arm and two connecting pins installed at two ends of the connecting arm, so as to respectively hinge the two ends of the connecting arm to the first vehicle body and the second vehicle body.

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