Tunneling equipment

Abstract

The invention provides tunneling equipment which comprises a chassis assembly and a driving device, the chassis assembly comprises a body, the body is provided with a first chassis and a second chassis which are sequentially arranged in the length direction of the tunneling equipment, the first chassis and the second chassis are detachably connected, and the first chassis and the second chassis both extend in the horizontal direction; the drill arm assembly is arranged at one end, away from the second chassis, of the first chassis; the pipeline mounting arm assembly is arranged at one end, close to the second chassis, of the first chassis; and the power assembly is arranged on the second chassis. By means of the technical scheme, the problems that in the prior art, tunneling equipment is single in function and low in construction efficiency can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine tunnels, and in particular to a tunneling device. Background Art

[0002] At present, rapid excavation is the key to coal mining efficiency. During the rapid excavation process, support and installation of pipelines such as water supply pipes, drainage pipes, compressed air pipes and gas extraction pipes are required. In particular, the top and side of the tunnel require anchoring and drilling operations, and multiple pipelines need to be installed.

[0003] However, in the prior art, existing large-scale anchoring equipment or pipeline installation equipment usually enters the tunnel separately and then cooperates with the construction, which affects the construction efficiency. In addition, the human resource cost will double. In view of this, there is an urgent need for multifunctional equipment that can simultaneously drive anchors, drill holes and install pipelines. Summary of the invention

[0004] The invention provides a tunneling device to solve the problem that the tunneling device in the prior art has a relatively single function and low construction efficiency.

[0005] The present invention provides a tunneling device, which includes: a chassis assembly, including a main body, the main body having a first chassis and a second chassis arranged in sequence along the length direction of the tunneling device, the first chassis and the second chassis are detachably connected, and the first chassis and the second chassis both extend in the horizontal direction; a drill arm assembly, arranged at one end of the first chassis away from the second chassis; a pipeline installation arm assembly, arranged at one end of the first chassis close to the second chassis; a power assembly, arranged on the second chassis.

[0006] Furthermore, the chassis assembly also includes a first splicing plate and a second splicing plate, both of which extend in a vertical direction, the first splicing plate is arranged at one end of the first chassis facing the second chassis, and the second splicing plate is arranged at one end of the second chassis facing the first chassis, and the first chassis and the second chassis are detachably connected via the first splicing plate and the second splicing plate.

[0007] Furthermore, a first reinforcement structure is provided between the first chassis and the first splicing plate, and / or a second reinforcement structure is provided between the second chassis and the second splicing plate.

[0008] Furthermore, the first reinforcement structure includes a plurality of first support plates arranged at intervals along the width direction of the excavation equipment, the first support plate is arranged at the bottom of the first chassis close to one end of the first splicing plate, one end of the first support plate abuts against the first splicing plate, the first support plate extends along the length direction, and the plurality of first support plates are arranged in parallel in the middle of the first chassis; the second reinforcement structure includes a plurality of second support plates arranged at intervals along the width direction of the excavation equipment, the second support plate is arranged at the bottom of the second chassis close to one end of the second splicing plate, one end of the second support plate abuts against the second splicing plate, the second support plate extends along the length direction, and the plurality of second support plates are arranged in parallel in the middle of the second chassis.

[0009] Furthermore, a first connecting plate is arranged between two adjacent first support plates, the first connecting plate is arranged at the bottom of the first chassis and extends along the width direction; a second connecting plate is arranged between two adjacent second support plates, the second connecting plate is arranged at the bottom of the second chassis and extends along the width direction.

[0010] Furthermore, the first reinforcement structure also includes a first reinforcement rib, which is arranged between the first chassis and the first splicing plate and is located on one side of the bottom of the first chassis along the width direction of the excavation equipment; the first reinforcement structure also includes a second reinforcement rib, which is arranged between the second chassis and the second splicing plate and is located on one side of the bottom of the second chassis along the width direction of the excavation equipment.

[0011] Furthermore, the chassis assembly also includes a supporting structure, which is movably arranged at the bottom of the body. The supporting structure can be close to or away from the body. When the supporting structure is away from the body, it can abut against the ground to support the body.

[0012] Furthermore, the supporting structure includes: a mounting seat, which is arranged at the bottom of the main body; a leg, one end of which is rotatably connected to the mounting seat; a first telescopic member, which is arranged at the bottom of the mounting seat along the length direction, and the first telescopic member has a first fixed end and a first movable end that are relatively arranged, and the first movable end can move along the length direction relative to the first fixed end, the first fixed end is hinged to the mounting seat, and the first movable end is hinged to one end of the leg away from the main body, and the first movable end drives the leg to approach or move away from the main body.

[0013] Furthermore, the mounting seat is movably connected to the main body, and the supporting structure also includes a second telescopic member, which extends in a horizontal direction. The second telescopic member has a second fixed end and a second movable end that are relatively arranged, and the second movable end can move relative to the second fixed end along the length direction of the second telescopic member. The second movable end is drivingly connected to the mounting seat, and the second movable end can drive the mounting seat to rotate relative to the main body to drive the support leg to rotate in a direction away from the main body.

[0014] Furthermore, two first protrusions are arranged at intervals on the top of the first splicing plate along the width direction of the excavation equipment, and a plurality of first through holes are arranged on the first protrusions; two second protrusions are arranged at intervals on the top of the second splicing plate along the width direction, and a plurality of second through holes are arranged on the second protrusions; the plurality of first through holes and the plurality of second through holes are arranged in one-to-one correspondence, and the first through holes cooperate with the second through holes through fasteners to realize the detachable connection between the first chassis and the second chassis.

[0015] By applying the technical solution of the present invention, the chassis assembly of the tunneling equipment is designed into two detachable parts, so that the first chassis and the second chassis can be separated during transportation of the tunneling equipment, which makes it easier to move and splice the tunneling equipment in narrow tunnels, greatly reducing the space requirements during transportation. In addition, the chassis assembly is also provided with a drill arm assembly, a pipeline installation arm assembly and a power assembly. The above-mentioned tunneling assemblies are integrated on the same chassis assembly, so that the tunneling equipment can simultaneously have the functions of anchoring, drilling and pipeline installation, which is not only convenient to move in the tunnel, but also does not require multiple workers to drive different equipment to work together, reducing the overall operating cost, while also improving the convenience of operation and construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic diagram of the structure of the tunneling equipment provided by the present invention is shown;

[0018] Figure 2 A schematic structural diagram of a chassis assembly provided by the present invention is shown;

[0019] Figure 3 The figure shows an assembly schematic diagram of the chassis assembly provided by the present invention;

[0020] Figure 4 A bottom view of a chassis assembly provided by the present invention is shown.

[0021] The above drawings include the following reference numerals:

[0022] 10. Chassis components;

[0023] 11. First chassis;

[0024] 12. Second chassis;

[0025] 13. The first splicing plate;

[0026] 131, first protrusion;

[0027] 14. Second splicing plate;

[0028] 141, second protrusion;

[0029] 20. Drill arm assembly;

[0030] 30. Pipeline mounting arm assembly;

[0031] 40. Power components;

[0032] 51. A first support plate;

[0033] 52. A second supporting plate;

[0034] 54. Second connecting plate;

[0035] 55. The first reinforcement rib;

[0036] 56. Second reinforcement rib;

[0037] 61. Mounting seat;

[0038] 62. Outrigger;

[0039] 63. first telescopic member;

[0040] 64. second telescopic member;

[0041] 70. Operation table;

[0042] 80. Walking department. DETAILED DESCRIPTION

[0043] 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, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. 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.

[0044] like Figures 1 to 4 As shown, an embodiment of the present invention provides a tunneling equipment, which includes: a chassis assembly 10, including a main body, the main body having a first chassis 11 and a second chassis 12 arranged in sequence along the length direction of the tunneling equipment, the first chassis 11 and the second chassis 12 are detachably connected, and the first chassis 11 and the second chassis 12 both extend in a horizontal direction; a drill arm assembly 20, arranged at one end of the first chassis 11 away from the second chassis 12; a pipeline installation arm assembly 30, arranged at one end of the first chassis 11 close to the second chassis 12; a power assembly 40, arranged on the second chassis 12.

[0045] By applying the technical solution of the present invention, the chassis assembly of the tunneling equipment is designed into two detachable parts, so that the first chassis 11 and the second chassis 12 can be separated during transportation of the tunneling equipment, which makes it easier to move and splice the tunneling equipment in narrow tunnels, greatly reducing the space requirements during transportation. In addition, the chassis assembly 10 is also provided with a drill arm assembly 20, a pipeline installation arm assembly 30 and a power assembly 40. The above-mentioned tunneling assemblies are integrated on the same chassis assembly 10, so that the tunneling equipment can simultaneously have functions such as anchoring, drilling and pipeline installation, thereby improving the practicality of the tunneling equipment. Not only is it convenient to move in the tunnel, but there is no need for multiple workers to drive different equipment to work together, which reduces the overall operating cost, while also improving the convenience of operation and the construction efficiency.

[0046] The length of the first chassis 11 is greater than that of the second chassis 12 , and the second chassis 12 serves as an extension of the first chassis 11 , so that the stability of the support of the chassis assembly 10 can be ensured.

[0047] Furthermore, the chassis assembly 10 further includes a first splicing plate 13 and a second splicing plate 14, both of which extend in the vertical direction, the first splicing plate 13 is arranged at one end of the first chassis 11 facing the second chassis 12, the second splicing plate 14 is arranged at one end of the second chassis 12 facing the first chassis 11, and the first chassis 11 and the second chassis 12 are detachably connected through the first splicing plate 13 and the second splicing plate 14. Through the above design, the splicing plate can increase the contact area at the connection between the first chassis 11 and the second chassis 12, improve the stability of the connection between the first chassis 11 and the second chassis 12, and thus ensure the stability of the support for each component on the body.

[0048] Among them, the top and bottom of the first splicing plate 13 and the second splicing plate 14 are connected by fasteners. This splicing method simplifies the on-site assembly process, can quickly complete the assembly and disassembly of the chassis, reduces construction waiting time, and improves assembly efficiency.

[0049] In this embodiment, a first reinforcement structure is provided between the first chassis 11 and the first splicing plate 13, and a second reinforcement structure is provided between the second chassis 12 and the second splicing plate 14. By providing the reinforcement structure, not only the strength of the connection between the body and the splicing plate is improved, but also the overall anti-deformation ability of the equipment is enhanced, and the structural stability and reliability of the equipment are significantly improved, so that it can remain stable in complex environments and heavy load conditions. It can also extend the service life of the equipment and save maintenance and replacement costs.

[0050] In other embodiments of the present application, a first reinforcement structure is provided between the first chassis 11 and the first splicing plate 13 .

[0051] In some other embodiments of the present application, a second reinforcement structure is provided between the second chassis 12 and the second splicing plate 14 .

[0052] Specifically, the first reinforcement structure includes a plurality of first support plates 51 spaced apart along the width direction of the excavation equipment, the first support plates 51 are arranged at the bottom of the first chassis 11 near one end of the first splicing plate 13, one end of the first support plate 51 abuts against the first splicing plate 13, the first support plate 51 extends along the length direction, and a plurality of first support plates 51 are arranged in parallel in the middle of the first chassis 11; the second reinforcement structure includes a plurality of second support plates 52 spaced apart along the width direction of the excavation equipment, the second support plates 52 are arranged at the bottom of the second chassis 12 near one end of the second splicing plate 14, one end of the second support plates 52 abuts against the second splicing plate 14, the second support plates 52 extend along the length direction, and a plurality of second support plates 52 are arranged in parallel in the middle of the second chassis 12. By arranging a plurality of parallel support plates between the body and the splicing plate, not only a more stable structural frame is formed, the structural strength of the body is enhanced, but the support plates can also effectively disperse the stress on the body, extend the service life of the chassis assembly 10, and ensure the continuity and efficiency of construction.

[0053] Furthermore, a first connecting plate is provided between two adjacent first supporting plates 51, the first connecting plate is provided at the bottom of the first chassis 11 and extends in the width direction; a second connecting plate 54 is provided between two adjacent second supporting plates 52, the second connecting plate 54 is provided at the bottom of the second chassis 12 and extends in the width direction. In this way, the connection between the supporting plates can be further strengthened, the structural stability of the equipment is improved, and the reliability and safety of the equipment during high-load operation are ensured.

[0054] The first reinforcement structure further includes a first reinforcement rib 55, which is arranged between the first chassis 11 and the first splicing plate 13 and located at one side of the bottom of the first chassis 11 along the width direction of the excavation equipment; the first reinforcement structure further includes a second reinforcement rib 56, which is arranged between the second chassis 12 and the second splicing plate 14 and located at one side of the bottom of the second chassis 12 along the width direction of the excavation equipment. The arrangement of the reinforcement ribs further increases the strength of the connection between the body and the connecting plate, and can better absorb and disperse the impact force, maintaining the integrity and stability of the structure.

[0055] Preferably, first reinforcing ribs 55 are provided on both sides of the bottom of the first chassis 11 along the width direction of the excavation equipment, and second reinforcing ribs 56 are provided on both sides of the bottom of the second chassis 12 along the width direction of the excavation equipment. This can further improve the support reliability of the chassis assembly 10.

[0056] The chassis assembly 10 further includes a support structure, which is movably arranged at the bottom of the body, and can be close to or away from the body. When the support structure is away from the body, it can abut against the ground to support the body. Through the above design, the equipment can be stably operated on uneven ground or slopes, the support effect of the support structure is improved, and the adaptability and flexibility of the equipment are improved.

[0057] Specifically, the support structure includes: a mounting seat 61, a leg 62 and a first telescopic member 63. Among them, the mounting seat 61 is arranged at the bottom of the main body. One end of the leg 62 is rotatably connected to the mounting seat 61. The first telescopic member 63 is arranged at the bottom of the mounting seat 61 along the length direction. The first telescopic member 63 has a first fixed end and a first movable end that are relatively arranged. The first movable end can move along the length direction relative to the first fixed end. The first fixed end is hinged to the mounting seat 61, and the first movable end is hinged to the end of the leg 62 away from the main body. The first movable end drives the leg 62 to move closer to or away from the main body. This design makes it easier to extend and retract the leg 62, can quickly adjust the support state of the equipment, and improves the flexibility of adjusting the support structure.

[0058] The tunneling equipment has four groups of supporting structures, which are spaced apart at both ends of the main body along the length direction and are respectively located below the first chassis 11 and the second chassis 12 , so as to ensure the stability of the support for the first chassis 11 and the second chassis 12 .

[0059] In the present application, the mounting seat 61 is movably connected to the body, and the support structure further includes a second telescopic member 64, which extends in the horizontal direction. The second telescopic member 64 has a second fixed end and a second movable end that are relatively arranged, and the second movable end can move along the length direction of the second telescopic member 64 relative to the second fixed end. The second movable end is drivingly connected to the mounting seat 61, and the second movable end can drive the mounting seat 61 to rotate relative to the body to drive the support leg 62 to rotate in a direction away from the body. By driving the second telescopic member 64, the support width of the support structure can be increased, and the stability of the support structure can be further increased.

[0060] Furthermore, two first protrusions 131 are arranged at intervals on the top of the first splicing plate 13 along the width direction of the excavation equipment, and a plurality of first through holes are arranged on the first protrusion 131. Two second protrusions 141 are arranged at intervals on the top of the second splicing plate 14 along the width direction, and a plurality of second through holes are arranged on the second protrusion 141. The plurality of first through holes correspond to the plurality of second through holes in a one-to-one manner, and the first through holes cooperate with the second through holes through fasteners to achieve a detachable connection between the first chassis 11 and the second chassis 12. Through the above arrangement, the distance between adjacent fasteners in the vertical direction can be increased, the stress of a single fastener can be reduced, and the fixing effect between the splicing plates can be improved.

[0061] In the present application, the tunneling equipment also includes an operating table 70 and a walking unit 80. The operating table 70 is arranged between the power assembly 40 and the pipeline installation arm assembly 30. The operating table 70 can control and drive components such as the drill arm assembly 20 in the tunneling equipment. The walking unit 80 is arranged at the bottom of the first chassis 11, which can further ensure stability during walking, while simplifying the number of components on the second chassis 12 and improving the convenience of disassembly and assembly. The walking unit 80 is used to drive the chassis assembly 10 to move in the tunnel.

[0062] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0063] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0064] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0065] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0066] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A tunneling device, characterized in that: The excavation equipment comprises: A chassis assembly (10) comprises a body, wherein the body comprises a first chassis (11) and a second chassis (12) arranged in sequence along the length direction of the tunneling equipment, wherein the first chassis (11) and the second chassis (12) are detachably connected, and the first chassis (11) and the second chassis (12) both extend in a horizontal direction; A drill arm assembly (20) is arranged at one end of the first chassis (11) away from the second chassis (12); A pipeline installation arm assembly (30) is arranged at one end of the first chassis (11) close to the second chassis (12); A power assembly (40) is arranged on the second chassis (12).

2. The excavation equipment according to claim 1, characterized in that: The chassis assembly (10) further comprises a first splicing plate (13) and a second splicing plate (14); the first splicing plate (13) and the second splicing plate (14) both extend in a vertical direction; the first splicing plate (13) is arranged at one end of the first chassis (11) facing the second chassis (12); the second splicing plate (14) is arranged at one end of the second chassis (12) facing the first chassis (11); the first chassis (11) and the second chassis (12) are detachably connected via the first splicing plate (13) and the second splicing plate (14).

3. The excavation equipment according to claim 2, characterized in that: A first reinforcement structure is provided between the first chassis (11) and the first splicing plate (13), and / or a second reinforcement structure is provided between the second chassis (12) and the second splicing plate (14).

4. The excavation equipment according to claim 3, characterized in that: The first reinforcement structure comprises a plurality of first support plates (51) arranged at intervals along the width direction of the tunneling equipment, the first support plates (51) being arranged at the bottom of the first chassis (11) close to one end of the first splicing plate (13), one end of the first support plate (51) being in contact with the first splicing plate (13), the first support plate (51) extending along the length direction, and the plurality of first support plates (51) being arranged in parallel in the middle of the first chassis (11); The second reinforcement structure comprises a plurality of second support plates (52) arranged at intervals along the width direction of the tunneling equipment, the second support plates (52) being arranged at the bottom of the second chassis (12) close to one end of the second splicing plate (14), one end of the second support plate (52) being in contact with the second splicing plate (14), the second support plate (52) extending along the length direction, and a plurality of second support plates (52) being arranged in parallel in the middle of the second chassis (12).

5. The excavation equipment according to claim 4, characterized in that: A first connecting plate is arranged between two adjacent first supporting plates (51), and the first connecting plate is arranged at the bottom of the first chassis (11) and extends along the width direction; A second connecting plate (54) is provided between two adjacent second supporting plates (52); the second connecting plate (54) is provided at the bottom of the second chassis (12) and extends along the width direction.

6. The excavation equipment according to claim 3, characterized in that: The first reinforcement structure further comprises a first reinforcement rib (55), wherein the first reinforcement rib (55) is arranged between the first chassis (11) and the first splicing plate (13), and is located at one side of the bottom of the first chassis (11) along the width direction of the tunneling equipment; The first reinforcement structure further comprises a second reinforcement rib (56), wherein the second reinforcement rib (56) is arranged between the second chassis (12) and the second splicing plate (14) and is located at one side of the bottom of the second chassis (12) along the width direction of the tunneling equipment.

7. The excavation equipment according to claim 1, characterized in that: The chassis assembly (10) further comprises a supporting structure, which is movably arranged at the bottom of the body, and can be moved close to or away from the body. When the supporting structure is away from the body, it can abut against the ground to support the body.

8. The excavation equipment according to claim 7, characterized in that: The support structure comprises: A mounting seat (61) is arranged at the bottom of the body; A supporting leg (62), one end of the supporting leg (62) being rotatably connected to the mounting seat (61); A first telescopic member (63) is arranged at the bottom of the mounting seat (61) along the length direction, the first telescopic member (63) has a first fixed end and a first movable end which are arranged opposite to each other, the first movable end can move along the length direction relative to the first fixed end, the first fixed end is hinged to the mounting seat (61), the first movable end is hinged to an end of the leg (62) away from the main body, and the first movable end drives the leg (62) to move closer to or away from the main body.

9. The excavation equipment according to claim 8, characterized in that: The mounting seat (61) is movably connected to the main body, and the supporting structure also includes a second telescopic member (64), the second telescopic member (64) extends in a horizontal direction, the second telescopic member (64) has a second fixed end and a second movable end arranged opposite to each other, the second movable end can move relative to the second fixed end along the length direction of the second telescopic member (64), the second movable end is drivingly connected to the mounting seat (61), and the second movable end can drive the mounting seat (61) to rotate relative to the main body, so as to drive the supporting leg (62) to rotate in a direction away from the main body.

10. The excavation equipment according to claim 2, characterized in that: Two first protrusions (131) are arranged at intervals on the top of the first splicing plate (13) along the width direction of the tunneling equipment, and a plurality of first through holes are arranged on the first protrusions (131); two second protrusions (141) are arranged at intervals on the top of the second splicing plate (14) along the width direction, and a plurality of second through holes are arranged on the second protrusions (141); the plurality of first through holes and the plurality of second through holes are arranged in a one-to-one correspondence; the first through holes cooperate with the second through holes through fasteners to realize a detachable connection between the first chassis (11) and the second chassis (12).

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