Environmental protection treatment device for slag, shield machine

Abstract

The present invention discloses a slag environmental protection treatment device and a shield machine. The slag environmental protection treatment device comprises: a screw conveyor, which is used to discharge the slag in the excavation bin; a scraper, which is used to separate the particles and mud in the slag; a first transmission mechanism, which is used to transmit the particles and mud separated by the scraper; a vibrating screen, which separates stones and bentonite; a bentonite box, which is used to receive the bentonite separated by the vibrating screen; a second transmission mechanism, which is used to transport the stones separated by the vibrating screen out of the shield machine; and a sewage tank, which is used to collect muddy water generated during the bentonite separation process. The slag environmental protection treatment device provided by the present invention can be installed inside the shield machine during use, realizing the combination of the slag environmental protection treatment device and the shield machine, and improving the integration effect of the shield machine; and in the process of separating the slag, bentonite can be separated, reducing the pollution of bentonite to the environment and improving the utilization rate of bentonite.

Description

Technical Field

[0001] The present invention relates to the technical field of tunneling construction, and more specifically, to a device for environmentally friendly treatment of slag. In addition, the present invention also relates to a shield machine including the device for environmentally friendly treatment of slag. Background Art

[0002] The earth pressure balance shield machine uses a screw conveyor and a belt conveyor to discharge slag. The slag contains mud, bentonite, slag and gravel. For water-rich slag, on the one hand, it is not conducive to the slag discharge of the belt conveyor, it is difficult to handle, easy to leak, and pollutes the environment; on the other hand, the water, bentonite and gravel in the slag cannot be completely separated and treated, which loses the value of reuse.

[0003] In order to solve the problems of shield slurry pollution and slag recycling in the prior art, a mud treatment system is usually configured on the ground. A mud pump is used to transport mud in the tunnel, and large-sized gravel is screened on the ground. This method requires long-distance material transportation, consumes a lot of energy, and cannot recycle bentonite.

[0004] In summary, how to provide an environmentally friendly slag treatment device that can recycle bentonite is a problem that urgently needs to be solved by those skilled in the art. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a slag environmental protection treatment device, which can be installed in a shield machine to improve the integration effect of the shield machine; and can separate bentonite, reduce the pollution of bentonite to the environment, and improve the utilization rate of bentonite.

[0006] Another object of the present invention is to provide a shield machine including the above-mentioned slag environmental protection treatment device.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A slag environmental protection treatment device, installed in a shield machine, comprising:

[0009] A screw conveyor, which is used to discharge the debris in the excavation bin;

[0010] A scraper is arranged at the rear side of the screw conveyor, and is used to receive the slag discharged by the screw conveyor and separate the particles in the slag from the mud;

[0011] A first conveying mechanism, used for conveying the particles and the slurry separated by the scraper;

[0012] A vibrating screen receives the particles and the slurry transmitted by the transmission mechanism and separates stones and bentonite;

[0013] A bentonite box, used for receiving the bentonite separated by the vibrating screen;

[0014] A second conveying mechanism is provided at the discharge end of the vibrating screen and is used to transport the stone separated by the vibrating screen out of the shield machine;

[0015] Sewage tank, used to collect muddy water produced during bentonite separation.

[0016] Optionally, it further comprises a rotary separator disposed on the upper portion of the vibrating screen and a first bentonite pump for pumping bentonite in the bentonite box to the rotary separator;

[0017] The rotary separator is used to separate muddy water and particulate matter from the bentonite, the sewage tank is used to collect the muddy water separated by the rotary separator, and the particulate matter separated by the rotary separator is discharged to the vibrating screen.

[0018] Optionally, a second bentonite pump is further included, one end of which is connected to the bentonite box and the other end of which extends to the excavation bin, and the second bentonite pump is used to pump bentonite in the bentonite box into the excavation bin.

[0019] Optionally, it also includes a sewage pump and a sewage treatment device, and the sewage pump is used to pump muddy water in the sewage tank to the sewage treatment device.

[0020] Optionally, the water outlet of the sewage pump is connected to at least one of the bentonite box, the vibrating screen, and the scraper to pump muddy water in the sewage tank into at least one of the bentonite box, the vibrating screen, and the scraper.

[0021] Optionally, the first conveying mechanism includes a mud collection device, a mud pump and a first belt conveying assembly;

[0022] The mud collecting device is arranged at the lower part of the scraper to collect the mud separated by the scraper; the mud pump is used to pump the mud in the mud collecting device to the vibrating screen;

[0023] The first belt conveyor assembly is used to convey the particles separated by the scraper to the vibrating screen.

[0024] Optionally, the scraper is arranged to be inclined upward at one end close to the vibrating screen.

[0025] Optionally, the vibrating screen includes a multi-stage vibrating assembly to separate particles of different specifications.

[0026] A shield machine comprises a shield machine body, a rear supporting system located at the rear side of the shield machine body, a connecting bridge connecting the shield machine body and the rear supporting system, and any one of the above-mentioned slag environmental protection treatment devices.

[0027] Optionally, one end of the screw conveyor is connected to the excavation chamber of the shield machine, and the other end extends to the rear side of the shield machine body; the scraper is located at the lower part of the slag outlet of the screw conveyor, and the bentonite box is located at the lower part of the vibrating screen;

[0028] The scraper is located in the connecting bridge, the vibrating screen is located in the middle of the rear supporting system, and the sewage tank is located at the rear side of the rear supporting system.

[0029] In the process of using the environmentally friendly soil treatment device provided by the present invention, during the excavation process of the shield machine, the soil in the excavation bin is discharged to the scraper through the screw conveyor. When the soil is water-rich soil, the scraper separates the particulate matter and mud in the soil. The separated mud and particulate matter are transported to the vibrating screen through the first conveying mechanism. The vibrating screen separates bentonite and stone from the received mud and particulate matter. The bentonite separated by the vibrating screen enters the bentonite box, and the stone separated by the vibrating screen is transported out of the shield machine by the second conveying mechanism; the mud and water generated in the process of separating the bentonite are collected in the sewage tank.

[0030] Compared with the prior art, the slag environmental protection treatment device provided by the present invention can be installed inside a shield machine during use, thereby realizing the combination of the slag environmental protection treatment device and the shield machine and improving the integration effect of the shield machine; and in the process of separating the slag, bentonite can be separated, reducing the pollution of bentonite to the environment and improving the utilization rate of bentonite.

[0031] In addition, the present invention also provides a shield machine including the above-mentioned slag environmental protection treatment device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0033] Figure 1 A schematic structural diagram of a specific embodiment of the shield machine provided by the present invention;

[0034] Figure 2 A structural schematic diagram of a specific embodiment of the front end of the shield machine provided by the present invention;

[0035] Figure 3 A schematic structural diagram of a specific embodiment of the middle end of the shield machine provided by the present invention;

[0036] Figure 4 A structural schematic diagram of a specific embodiment of the rear end of the shield machine provided by the present invention;

[0037] Figure 5 This is a schematic diagram of the construction process of the environmentally friendly slag treatment device provided by the present invention.

[0038] Figure 1-Figure 5 middle:

[0039] 1 is the shield machine body, 2 is the rear supporting system, 3 is the screw conveyor, 4 is the connecting bridge, 5 is the scraper, 6 is the mud collecting device, 7 is the first belt transmission component, 8 is the vibrating screen, 9 is the bentonite box, 10 is the rotary separator, 11 is the sewage tank, 12 is the second transmission mechanism, 13 is the mud pump, 14 is the second bentonite pump, 15 is the first bentonite pump, 16 is the sewage pump, and 17 is the sewage treatment device. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] The core of the present invention is to provide an environmentally friendly slag treatment device, which can be installed in a shield machine to improve the integration effect of the shield machine; and can separate bentonite, reduce the pollution of bentonite to the environment, and improve the utilization rate of bentonite.

[0042] Another core of the present invention is to provide a shield machine including the above-mentioned slag environmental protection treatment device.

[0043] Please refer to Figure 1-Figure 5 .

[0044] It should be noted that the front side mentioned in this application document is the side close to the excavation end of the shield machine, and the rear side is the side close to the tail end of the shield machine.

[0045] This specific embodiment discloses a slag environmental protection treatment device, which is installed in a shield machine and includes:

[0046] A screw conveyor 3, which is used to discharge the slag in the excavation bin;

[0047] The scraper 5 is arranged at the rear side of the screw conveyor 3, and is used to receive the slag discharged by the screw conveyor 3 and separate the particles in the slag from the mud;

[0048] The first conveying mechanism is used to convey the particles and mud separated by the scraper 5;

[0049] The vibrating screen 8 receives the particles and mud transmitted by the transmission mechanism and separates the stone and bentonite;

[0050] A bentonite box 9, for receiving the bentonite separated by the vibrating screen 8;

[0051] The second conveying mechanism 12 is arranged at the discharge end of the vibrating screen 8 and is used to transport the stone separated by the vibrating screen 8 out of the shield machine;

[0052] The sewage tank 11 is used to collect muddy water generated during the bentonite separation process.

[0053] It should be noted that, during use, due to different geological environments, the slag transported by the screw conveyor 3 may be water-rich slag or slag with less water content, which is determined according to actual conditions and will not be elaborated here. When the slag transported by the screw conveyor 3 is water-rich slag, the first conveying mechanism needs to separate the mud and the particles during the conveying process to avoid leakage when the particles are conveyed together with the mud.

[0054] The first conveying mechanism may be a belt conveying device, a pipeline conveying device, or other conveying equipment, which is determined according to actual conditions and will not be elaborated here.

[0055] In the process of using the environmentally friendly soil treatment device provided in this specific embodiment, during the excavation process of the shield machine, the soil in the excavation bin is discharged to the scraper 5 through the screw conveyor 3. When the soil is water-rich soil, the scraper 5 separates the particulate matter and mud in the soil. The separated mud and particulate matter are transported to the vibrating screen 8 through the first conveying mechanism. The vibrating screen 8 separates bentonite and stone from the received mud and particulate matter. The bentonite separated by the vibrating screen 8 enters the bentonite box 9, and the stone separated by the vibrating screen 8 is transported out of the shield machine by the second conveying mechanism 12; the muddy water generated in the process of separating the bentonite is collected by the sewage tank 11.

[0056] Compared with the prior art, the slag environmental protection treatment device provided in this specific embodiment can be installed inside the shield machine during use, realizing the combination of the slag environmental protection treatment device and the shield machine, and improving the integration effect of the shield machine; and in the process of separating the slag, bentonite can be separated, reducing the pollution of bentonite to the environment and improving the utilization rate of bentonite.

[0057] In a specific embodiment, if Figure 1 , 3As shown, the environmental protection treatment device for slag further includes a rotary separator 10 arranged on the top of the vibrating screen 8 and a first bentonite pump 15 for extracting bentonite in the bentonite box 9 to the rotary separator 10; the rotary separator 10 is used to separate muddy water and particulate matter from the bentonite, the sewage tank 11 is used to collect the muddy water separated by the rotary separator 10, and the particulate matter separated by the rotary separator 10 is discharged to the vibrating screen 8.

[0058] It should be noted that the bentonite separated by the vibrating screen 8 contains some mud and water, so it is necessary to pump the bentonite to the rotary separator 10 through the first bentonite pump 15, and separate the bentonite into mud and water and particulate matter through the rotary separator 10. The particulate matter separated by the rotary separator 10 enters the vibrating screen 8 and is subjected to secondary vibration separation by the vibrating screen 8, which can effectively improve the separation effect of the bentonite and prevent pump clogging.

[0059] Compared with the prior art, the setting of the rotary separator 10 in this specific embodiment allows the mud and water in the bentonite to be separated, and the other particles except the mud and water after separation are discharged to the vibrating screen 8 for secondary separation, which effectively improves the separation effect and separation quality of the bentonite.

[0060] On the basis of the above specific embodiments, the environmentally friendly slag treatment device can also include a second bentonite pump 14, one end of the second bentonite pump 14 is connected to the bentonite box 9, and the other end extends to the excavation bin. The second bentonite pump 14 is used to extract the bentonite in the bentonite box 9 to the excavation bin.

[0061] After the bentonite is pumped out to the excavation bin, it can be mixed with the slag in the excavation bin, and can be used to improve the fluidity of the slag, making it convenient to discharge the slag in the excavation bin through the screw conveyor 3.

[0062] Specifically, the output end of the second bentonite pump 14 can be connected to the excavation chamber through a pipeline, and the input end of the second bentonite pump 14 can be connected directly or through a pipeline to the bentonite tank 9. The output end of the first bentonite pump 15 can be connected to the feed port of the rotary separator 10 through a pipeline, and the input end of the first bentonite pump 15 can be connected directly or through a pipeline to the bentonite tank 9.

[0063] Preferably, the first bentonite pump 15 is disposed at the rear side of the bentonite tank 9 , and the second bentonite pump 14 is disposed at the front side of the bentonite tank 9 .

[0064] In a specific embodiment, the environmental protection treatment device for slag further includes a sewage pump 16 and a sewage treatment device 17. The sewage pump 16 is used to pump the muddy water in the sewage tank 11 to the sewage treatment device 17; the water outlet of the sewage pump 16 is connected to at least one of the bentonite tank 9, the vibrating screen 8, and the scraper 5 to pump the muddy water in the sewage tank 11 into at least one of the bentonite tank 9, the vibrating screen 8, and the scraper 5.

[0065] like Figure 1 , 4 As shown, the outlet of the sewage pump 16 is connected to the bentonite tank 9, the vibrating screen 8, and the scraper 5. During use, the muddy water in the sewage tank 11 can be pumped out to the bentonite tank 9 by the sewage pump 16, which can be used to adjust the concentration of bentonite in the bentonite tank 9; the muddy water in the sewage tank 11 can be pumped out to the vibrating screen 8 and the scraper 5 by the sewage pump 16, which can be used to flush the vibrating screen 8 and the scraper 5 to prevent blockage. The sewage treatment device 17 is located at the rear side of the sewage tank 11, mainly used to purify the muddy water in the sewage tank 11, reduce the pollution of the muddy water to the environment, and the purified muddy water can be used again to improve the utilization rate.

[0066] In a specific embodiment, the first conveying mechanism includes a mud collecting device 6, a mud pump 13 and a first belt conveying assembly 7;

[0067] The mud collecting device 6 is arranged at the lower part of the scraper 5 to collect the mud separated by the scraper 5; the mud pump 13 is used to pump the mud in the mud collecting device 6 to the vibrating screen 8;

[0068] The first belt conveyor assembly 7 is used to convey the particles separated by the scraper 5 to the vibrating screen 8 .

[0069] The second conveying mechanism 12 may be a second belt conveying component, or other conveying components that meet the requirements, which is determined according to actual conditions.

[0070] In this specific embodiment, the mud and the particles separated by the scraper 5 are transmitted separately, which can effectively avoid the loss of mud during the transmission process and improve the transmission efficiency.

[0071] On the basis of the above embodiment, the end of the scraper 5 close to the vibrating screen 8 can be tilted upward. In the process of separating the slag, the particulate matter can move upward with the scraper 5 to the first belt conveyor mechanism. Under the action of gravity, the mud will flow downward into the mud collection device 6, which is conducive to filtering the mud and improving the working efficiency of the scraper 5; the transportation and treatment capacity of the slag environmental protection treatment device for water-rich slag is improved, and the pollution of mud and water to the belt conveyor, tunnel and environment is reduced.

[0072] Preferably, the vibrating screen 8 may include a multi-stage vibration assembly to separate particles of different specifications; the multi-stage vibration design can separate stones of various specifications, and the separated stones can be reused as resources, reducing the pollution of shield slag to the environment and improving the value of shield slag reuse. The bentonite separated by the vibrating screen 8 is discharged into the bentonite box 9 and can be reused by the shield machine, reducing the pollution of shield construction and improving the utilization rate of bentonite.

[0073] In addition to the above-mentioned environmentally friendly slag treatment device, the present invention also provides a shield machine including a shield machine body 1, a rear supporting system 2 located at the rear side of the shield machine body 1, a connecting bridge 4 connecting the shield machine body 1 and the rear supporting system 2, and the environmentally friendly slag treatment device disclosed in the above-mentioned embodiment. For the structure of other parts of the shield machine, please refer to the prior art and will not be repeated in this article.

[0074] like Figure 1 As shown, one end of the screw conveyor 3 is connected to the excavation chamber of the shield machine, and the other end extends to the rear side of the shield machine body 1; one end of the scraper 5 is located at the lower part of the slag outlet of the screw conveyor 3, and the other end is located at the upper part of the first belt transmission assembly 7, and the mud collection device 6 is located directly below the scraper 5; the bentonite box 9 is located at the lower part of the vibrating screen 8;

[0075] The scraper 5 is located in the connecting bridge 4, the mud collecting device 6 is installed on the connecting bridge 4, the vibrating screen 8 is located in the middle of the rear supporting system 2, the sewage tank 11 and the sewage treatment device 17 are installed in sequence on the rear side of the rear supporting system 2, and the sewage tank 11 and the sewage treatment device 17 are both located on the rear side of the rotary separator 10.

[0076] The slag environmental protection treatment device in the shield machine in this specific embodiment is rationally arranged with other structures, has a compact structure and high centralization. The setting of the slag environmental protection treatment device does not affect the installation of other subsystems in the subsequent supporting system 2, does not affect other functions of the shield machine, and improves the efficiency of slag environmental protection treatment.

[0077] In a specific embodiment, if Figure 1-4 As shown, the shield machine includes a shield machine body 1, a rear supporting system 2, a screw conveyor 3, a connecting bridge 4, a scraper 5, a mud collecting device 6, a first belt transmission component 7, a vibrating screen 8, a bentonite box 9, a rotary separator 10, a sewage tank 11, a second transmission mechanism 12, a mud pump 13, a second bentonite pump 14, a first bentonite pump 15, a sewage pump 16, and a sewage treatment device 17; in the specific use process, such as Figure 5 As shown in the figure, the construction process of the slag environmental protection treatment device is as follows:

[0078] Step S1, controlling the screw conveyor 3 to convey the slag in the excavation chamber of the shield machine to the scraper 5;

[0079] Step S2, controlling the scraper 5 to separate the mud in the slag into mud and particles, and discharging the separated mud to the mud collecting device 6, and discharging the separated particles to the first belt conveyor assembly 7;

[0080] Step S3, controlling the mud pump 13 to transfer the mud in the mud collecting device 6 to the vibrating screen 8, and controlling the first belt conveying assembly 7 to transfer the particles to the vibrating screen 8;

[0081] Step S4, controlling the vibrating screen 8 to separate the received particles and mud into stone and bentonite, controlling the separated bentonite to be discharged into the bentonite box 9, and controlling the second conveying mechanism 12 to transport the separated stone out of the shield machine;

[0082] Step S5, controlling the first bentonite pump 15 to pump the bentonite in the bentonite box 9 to the rotary separator 10, and controlling the second bentonite pump 14 to pump the bentonite in the bentonite box 9 to the excavation bin;

[0083] Step S6, controlling the rotary separator 10 to separate the bentonite into muddy water and particulate matter; controlling the particulate matter to be discharged to the vibrating screen 8, and returning to the fourth step and proceeding to the next step;

[0084] Step S7, controlling the sewage tank 11 to collect the muddy water separated by the rotary separator 10;

[0085] Step S8, controlling the sewage outlet device to purify the muddy water in the sewage tank 11;

[0086] Step S9 , controlling the sewage pump 16 to pump the muddy water in the sewage tank 11 to the bentonite tank 9 , the scraper 5 and the vibrating screen 8 .

[0087] Of course, depending on the quality of the slag, there may be other construction processes, which will be determined based on actual conditions and will not be elaborated here.

[0088] The "first" and "second" in the first belt conveyor assembly 7 and the second belt conveyor assembly, the first bentonite pump 15 and the second bentonite pump 14, and the first conveying mechanism and the second conveying mechanism 12 mentioned in the present application document are only for distinguishing the difference in position and there is no order of precedence.

[0089] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. Any combination of all embodiments provided by the present invention is within the protection scope of this invention and will not be described in detail here.

[0090] The above is a detailed introduction to the environmentally friendly slag treatment device and shield machine provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A slag environmental protection treatment device installed in a shield machine, characterized in that: include: A screw conveyor (3) for discharging the slag in the excavation bin; A scraper (5) is arranged at the rear side of the screw conveyor (3) and is used to receive the slag discharged by the screw conveyor (3) and separate the particles in the slag from the mud; a first conveying mechanism, used for conveying the particles and the slurry separated by the scraper (5); A vibrating screen (8) receives the particles and the slurry conveyed by the conveying mechanism and separates the stone and bentonite; A bentonite box (9) for receiving the bentonite separated by the vibrating screen (8); a second conveying mechanism (12), arranged at the discharge end of the vibrating screen (8), and used for conveying the stone separated by the vibrating screen (8) out of the shield machine; A sewage tank (11) for collecting muddy water generated during the bentonite separation process; The environmentally friendly slag treatment device further comprises a rotary separator (10) arranged on the upper part of the vibrating screen (8) and a first bentonite pump (15) for pumping bentonite in the bentonite box (9) into the rotary separator (10); The rotary separator (10) is used to separate muddy water and particulate matter from the bentonite, the sewage tank (11) is used to collect the muddy water separated by the rotary separator (10), and the particulate matter separated by the rotary separator (10) is discharged to the vibrating screen (8); The slag environmental protection treatment device also includes a second bentonite pump (14), one end of the second bentonite pump (14) is connected to the bentonite box (9), and the other end extends to the excavation bin, and the second bentonite pump (14) is used to pump the bentonite in the bentonite box (9) into the excavation bin; The environmentally friendly slag treatment device further comprises a sewage pump (16) and a sewage treatment device (17); the sewage pump (16) is used to pump muddy water in the sewage tank (11) to the sewage treatment device (17); The water outlet of the sewage pump (16) is connected to at least one of the bentonite box (9), the vibrating screen (8) and the scraper (5) so as to pump muddy water in the sewage tank (11) into at least one of the bentonite box (9), the vibrating screen (8) and the scraper (5).

2. The environmentally friendly slag treatment device according to claim 1 is characterized in that: The first transmission mechanism comprises a mud collection device (6), a mud pump (13) and a first belt transmission assembly (7); The mud collecting device (6) is arranged at the bottom of the scraper (5) to collect the mud separated by the scraper (5); the mud pump (13) is used to pump the mud in the mud collecting device (6) to the vibrating screen (8); The first belt conveyor assembly (7) is used to convey the particles separated by the scraper (5) to the vibrating screen (8).

3. The environmentally friendly slag treatment device according to claim 1 or 2, characterized in that: The scraper (5) is arranged to be inclined upward at one end close to the vibrating screen (8).

4. The environmentally friendly slag treatment device according to claim 1 or 2, characterized in that: The vibrating screen (8) comprises a multi-stage vibrating assembly to separate particles of different specifications.

5. A shield machine, characterized in that: It comprises a shield machine body (1), a rear supporting system (2) located at the rear side of the shield machine body (1), a connecting bridge (4) connecting the shield machine body (1) and the rear supporting system (2), and the environmentally friendly slag treatment device according to any one of claims 1 to 4.

6. The shield machine according to claim 5, characterized in that: One end of the screw conveyor (3) is connected to the excavation chamber of the shield machine, and the other end extends to the rear side of the shield machine body (1); the scraper (5) is located below the slag outlet of the screw conveyor (3), and the bentonite box (9) is located below the vibrating screen (8); The scraper (5) is located inside the connecting bridge (4), the vibrating screen (8) is located in the middle of the rear supporting system (2), and the sewage tank (11) is located on the rear side of the rear supporting system (2).

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