Auxiliary assembly device

Abstract

The utility model belongs to the technical field of aircraft assembly, and discloses an auxiliary assembly device. The auxiliary assembling device is used for installing a wire harness assembly on a to-be-installed structure and comprises an installing mechanism and a supporting mechanism, the installing mechanism is detachably connected with the wire harness assembly, the supporting mechanism comprises a base and two vertical bases which are connected with the base and arranged at intervals, and the two vertical bases are configured to support the to-be-installed structure; and the mounting mechanism is arranged between the two vertical seats so as to mount the wire harness assembly in the to-be-mounted structure. The wire harness assembly does not need to be delivered to a to-be-installed structure, the wire harness assembly can be pre-installed on the ground through the auxiliary assembling device, the ground assembling space is sufficient, multiple assemblies can be started at the same time, the assembling quality of the wire harness is improved, and the assembling efficiency of the wire harness is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to aircraft assembly technical field, especially auxiliary assembly device. BACKGROUND

[0002] The aircraft central console is the installation platform of each system control panel in the cockpit, is in the middle area of the pilot and the copilot, is mainly used for installing the throttle table, display, radio control panel and the control panel of other control panel. It integrates different input signals of each system of the aircraft, and the electrical wiring interconnection system (EWIS) of the cockpit central console area plays a key role in the transmission process of various signals, and the assembly quality of the wire harness directly affects the function of the cockpit central console.

[0003] The central console includes a to-be-installed structure and a wire harness, a plurality of binding members are respectively bound to the outer periphery of the wire harness, and the bound wire harness is installed on the corresponding installation point inside the to-be-installed structure through a support, a clamp or the like, so as to realize the installation of the wire harness and the to-be-installed structure.

[0004] However, due to the relatively closed to-be-installed structure and small operation space and other factors, it is difficult to directly lay the wire harness. Therefore, it is necessary to disassemble the to-be-installed structure after the to-be-installed structure is delivered with the aircraft, then lay the wire harness on the ground, and then re-install the to-be-installed structure on the aircraft after the wire harness is laid. This way causes repeated work, prolongs the construction period of the wire harness, reduces the assembly efficiency, slows down the aircraft assembly progress, and is not conducive to the batch production of the aircraft. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing an auxiliary assembly device, the wire harness assembly does not need to wait for the delivery of the to-be-installed structure, and the wire harness assembly can be pre-installed on the ground through the auxiliary assembly device, the ground assembly space is sufficient, and multiple batches can be started simultaneously, which improves the assembly quality and efficiency of the wire harness.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] An auxiliary assembly device is used for installing a wire harness assembly on a to-be-installed structure, comprising:

[0008] An installation mechanism, which is detachably connected with the wire harness assembly;

[0009] A support mechanism, which comprises a base and two vertical seats connected with the base and arranged at intervals, the two vertical seats are configured to support the to-be-installed structure, and the installation mechanism is arranged between the two vertical seats to install the wire harness assembly inside the to-be-installed structure.

[0010] As an optional solution of the auxiliary assembly device, the mounting mechanism comprises a frame and a connecting piece arranged on the frame, and the position of the connecting piece on the frame is adjustable to correspond to the wiring harness assembly.

[0011] As an optional solution of the auxiliary assembly device, the wiring harness assembly comprises a wiring harness structure and a fixing crossbeam for fixing the wiring harness structure, and the fixing crossbeam is detachably connected with the corresponding connecting piece.

[0012] As an optional solution of the auxiliary assembly device, at least part of the connecting piece comprises a first connecting part and a supporting part arranged at an angle, the first connecting part is configured to be connected with the fixing crossbeam, and the supporting part is configured to support one end of the fixing crossbeam.

[0013] As an optional solution of the auxiliary assembly device, the frame is provided with a plurality of connecting pieces in the vertical direction.

[0014] As an optional solution of the auxiliary assembly device, the stand is provided with a support and a fastener, the fastener is sequentially arranged through the support and the structure to be installed to fix the structure to be installed.

[0015] As an optional solution of the auxiliary assembly device, the support comprises two fixed plates arranged at intervals, the structure to be installed is provided with a supporting leg, and the supporting leg corresponds to the support one by one, the supporting leg is arranged between the two fixed plates of the corresponding support, and the fastener is threadedly connected with a nut after being arranged through the two fixed plates and the supporting leg.

[0016] As an optional solution of the auxiliary assembly device, at least two supports are arranged on the same stand, and the distance between the two adjacent supports is adjustable in the first direction.

[0017] As an optional solution of the auxiliary assembly device, the distance between the two supports is adjustable in the second direction.

[0018] As an optional solution of the auxiliary assembly device, the auxiliary assembly device further comprises a lifting mechanism configured to drive the mounting mechanism to lift to adjust the relative position between the wiring harness assembly and the structure to be installed.

[0019] Advantages:

[0020] The utility model provides a kind of auxiliary assembly device, for the pre-installation of wiring harness assembly, to install wiring harness assembly on the structure to be installed. Mounting mechanism is used in cooperation with support mechanism, wherein mounting mechanism is used to fix wiring harness assembly, and support mechanism is used to support the structure to be installed. Support mechanism includes base and two risers connected with base and spaced apart, the two risers can provide stable support for the structure to be installed, and provide space between the two risers for mounting mechanism and wiring harness assembly, so as to facilitate wiring harness assembly to be installed inside the structure to be installed. Through the auxiliary assembly device, wiring harness can be pre-installed on the ground, and then the pre-installed wiring harness is installed on the central console of the aircraft, avoiding assembly in the narrow space on the aircraft to meet the drawing requirements, and also allowing multiple flights to be started simultaneously, with sufficient assembly space on the ground and no need to wait for the delivery of the structure to be installed, improving the assembly quality and efficiency of wiring harness. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the structural schematic diagram of mounting mechanism provided by the utility model embodiment.

[0022] Figure 2 It is the structural schematic diagram of support mechanism provided by the utility model embodiment.

[0023] Figure 3 It is Figure 2 The local enlarged view of position A in

[0024] In the figure:

[0025] 1-mounting mechanism;11-frame;111-first vertical column;112-second vertical column;113-first crossbeam;114-second crossbeam;12-connecting piece;121-supporting part;122-first connecting part;123-second connecting part;13-foot pad;

[0026] 2-support mechanism;21-stand;22-fastener;23-base;24-riser;25-end cover;221-fixing plate;241-first riser;242-second riser;243-first support;244-second support. DETAILED DESCRIPTION

[0027] The utility model will be further described in detail in combination with the drawings and examples. It can be understood that the specific examples described here are only used to explain the utility model, and not limited to the utility model. In addition, it should be noted that, in order to facilitate description, only part of the structure related to the utility model is shown in the drawings, not all structures.

[0028] In the description of the utility model, unless another definite provision and limitation, the term "connect", "connection", "fixed" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0029] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, can also include the first and second features are not direct contact but contact through the additional feature between them. Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the first feature is higher than the second feature in horizontal height. The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the first feature is less than the second feature in horizontal height.

[0030] In the description of the embodiment, the terms "on", "under" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification operation, and not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in description, and have no special meaning.

[0031] The central operating table (not shown in the figure) includes an operating table outer frame and a wire harness, a plurality of binding members are bound on the outer periphery of the wire harness, and the bound wire harness is installed on the corresponding mounting point inside the operating table outer frame through a support, a clamp and the like, so as to realize the installation of the wire harness and the operating table outer frame. However, due to the relatively closed operating table outer frame and small operating space and the like, it is difficult to directly lay the wire harness. Therefore, it is necessary to remove the operating table outer frame after the delivery of the aircraft, then lay the wire harness on the ground, and then reinstall the operating table outer frame on the aircraft after the wire harness is laid. This way causes repeated work, prolongs the construction period of the wire harness laying, reduces the assembly efficiency, slows down the aircraft assembly progress, and is not conducive to the batch production of the aircraft.

[0032] As Figures 1-2 shown, to solve the above problems, the utility model provides an auxiliary assembly device, which is used for pre-installing a wire harness assembly on a to-be-installed structure. It is worth noting that in the embodiment, the to-be-installed structure is taken as an example of the operating table outer frame of the central operating table.

[0033] The auxiliary assembly device comprises a mounting mechanism 1 and a supporting mechanism 2, which are used in cooperation. The mounting mechanism 1 is detachably connected with the wire harness assembly, and is used for fixing the wire harness assembly arranged in a preset position, which is consistent with the installation position of the wire harness assembly in the central console area. The supporting mechanism 2 comprises a base 23 and two vertical seats 24 connected with the base 23 and arranged at intervals, and the two vertical seats 24 are configured to support the console outer frame. The mounting mechanism 1 is arranged between the two vertical seats 24 to install the wire harness assembly inside the console outer frame. The two vertical seats 24 of the supporting mechanism 2 can provide stable support for the console outer frame, and provide space for the mounting mechanism 1 and the wire harness assembly arranged between the two vertical seats 24, so as to facilitate the installation of the wire harness assembly inside the console outer frame. Through the auxiliary assembly device, the wire harness can be pre-installed on the ground, and the pre-installed wire harness is installed on the central console of the aircraft as a whole, which avoids the difficulty of assembly in the narrow space on the aircraft to meet the requirements of the drawing, and also enables multiple aircrafts to be simultaneously started at the same time, and the assembly space on the ground is sufficient, and the console outer frame does not need to be delivered, thereby improving the assembly quality and efficiency of the wire harness.

[0034] In the embodiment, as shown in Figure 1 The mounting mechanism 1 comprises a frame 11 and a connecting piece 12 arranged on the frame 11. The position of the connecting piece 12 on the frame 11 is adjustable to correspond to the wire harness assembly. The connecting piece 12 and the frame 11 are connected by one or a combination of screws, pins, rivets and movable buckles, so as to facilitate the quick disassembly and assembly of the connecting piece 12 and the frame 11. Since the wire harness assembly of the central console may differ due to different aircraft models or batches, the size, shape and position of the binding member may also differ. If the position of the connecting piece 12 of the mounting mechanism 1 is fixed, it may not be well connected when facing different wire harness assemblies, or even may not be installed. After the position-adjustable connecting piece 12 is arranged, when different specifications of wire harness assemblies are encountered, the operator can adjust the position of the connecting piece 12 according to the actual situation, so that it accurately corresponds to the connecting position on the wire harness assembly. In this way, no matter what type of wire harness assembly, it can be stably pre-installed through the mounting mechanism 1. At the same time, the position-adjustable design of the connecting piece 12 also makes the mounting mechanism 1 remain applicable when facing new wire harness assembly designs that may appear in the future, prolongs the service life of the mounting mechanism 1, and reduces the equipment update cost.

[0035] Further, the wire harness assembly comprises a wire harness structure and a fixing crossbeam (not shown in the figure), the fixing crossbeam is used for fixing the wire harness structure, and the fixing crossbeam is detachably connected with the corresponding connecting piece 12. In this way, the dismounting operation is facilitated when the wire harness assembly is installed on the central console of the airplane. Specifically, the fixing crossbeam is provided with a plurality of mounting holes arranged at preset positions, the wire harness structure is fixed on the mounting holes of the fixing crossbeam through a clamp or the like, and the fixing crossbeam is connected with the connecting piece 12 at the preset positions, which are consistent with the installation positions of the wire harness assembly in the central console area. The fixing crossbeam and the connecting piece 12 can be fixed by one or a combination of screws, pins, rivets and movable buckles. It should be noted that one fixing crossbeam cooperates with two connecting pieces 12, and the number of fixing crossbeams is determined according to the specific laying arrangement of the wire harness structure, and the specific number of fixing crossbeams is not limited herein.

[0036] Specifically, at least part of the connecting piece 12 comprises a first connecting part 122 and a supporting part 121, the first connecting part 122 and the supporting part 121 are arranged at an included angle, the first connecting part 122 is configured to be connected with the fixing crossbeam, and the supporting part 121 is configured to support one end of the fixing crossbeam. The supporting part 121 can temporarily support the other end of the fixing crossbeam when the one end of the fixing crossbeam is installed, facilitating the installation, and can still abut against the fixing crossbeam after the fixing crossbeam is fixed with the first connecting part 122, thereby reducing the load of the structure for fixing the fixing crossbeam with the connecting piece 12 and improving the service life. Optionally, the first connecting part 122 and the supporting part 121 are arranged perpendicularly, further enhancing the supporting effect. In addition, the connecting piece 12 needs to be removed from the sharp change and sharp angle to avoid damage to the wire harness.

[0037] In some embodiments, the connecting piece 12 further comprises a second connecting part 123, which is detachably connected with the frame 11 to fix the position of the connecting piece 12.

[0038] In some embodiments, the first connecting part 122 and the supporting part 121 can be the same structure, that is, the first connecting part 122 of the connecting piece 12 is located below the fixing crossbeam, and the first connecting part 122 can support the fixing crossbeam and be fixedly connected with the fixing crossbeam. Further, in the vertical direction, the frame 11 is provided with a plurality of connecting pieces 12. The connecting pieces 12 on both sides of the frame 11 correspond to each other and are used for connecting both ends of the fixing crossbeam. The connecting pieces 12 with different heights can support and fix the fixing crossbeam at different heights, thereby increasing the number and distribution range of the fixed positions of the wire harness structure in the wire harness assembly, and ensuring the stability of the wire harness structure.

[0039] In the embodiment, as shown in FIG. 2, the connecting piece 12 comprises a first connecting part 122 and a supporting part 121, the first connecting part 122 and the supporting part 121 are arranged at an included angle, the first connecting part 122 is configured to be connected with the fixing crossbeam, and the supporting part 121 is configured to support one end of the fixing crossbeam. Figure 1As shown, the frame 11 is made of aluminum alloy, and each part is connected by welding. The frame 11 is light in weight, high in strength, good in corrosion resistance, and firm in connection, and can meet the use requirements of the auxiliary assembly device. The frame 11 includes a first cross beam 113, a first vertical column 111, and a second vertical column 112. The first vertical column 111 and the second vertical column 112 are respectively connected to two ends of the first cross beam 113. The first vertical column 111 and the second vertical column 112 are both arranged at an angle with the two first cross beams 113. The first vertical column 111 and the second vertical column 112 are both in H shape to improve the overall strength of the frame 11. The fixing cross beam is arranged between the first vertical column 111 and the second vertical column 112. Preferably, the first vertical column 111 and the second vertical column 112 are respectively arranged perpendicularly to the first cross beam 113.

[0040] In the embodiment, the frame 11 includes two first cross beams 113. The two first cross beams 113 are arranged at intervals along the horizontal direction and are connected to the first vertical column 111 and the second vertical column 112 to further improve the strength of the frame 11 and ensure that the frame 11 will not be deformed when fixing the wire harness assembly.

[0041] In the embodiment, the top end of the second vertical column 112 is provided with a second cross beam 114. The second cross beam 114 can be used to fix the connecting piece 12 and improve the strength of the second vertical column 112.

[0042] Further, the mounting mechanism 1 is provided with a foot pad 13 installed at the lower end of the first vertical column 114 and the second vertical column 115. The foot pad 13 is made of nylon material and can be placed on the ground. The nylon material can ensure that the device is reliable in use. The foot pad 13 is fixed reliably and prevents the overall structure from being unstable and shaking.

[0043] In the embodiment, as shown in FIG. 1, Figures 2-3As shown, the stand 24 is provided with the support 21 and the fastener 22, the fastener 22 is sequentially arranged through the support 21 and the operating table outer frame to fix the operating table outer frame. When the wiring harness assembly is pre-installed, it needs to be installed in the interior of the operating table outer frame. If the operating table outer frame cannot be effectively fixed, the operating table outer frame may move or shake due to external force or its own gravity during the installation of the wiring harness assembly. This not only affects the installation accuracy of the wiring harness assembly, but also may cause safety hazards to the operator. By arranging the support 21 and the fastener 22 on the stand 24, when the operating table outer frame is placed on the two stands 24 of the supporting mechanism 2, the fastener 22 is sequentially arranged through the support 21 and the operating table outer frame, which can tightly fix the operating table outer frame on the supporting mechanism 2. In this way, when the wiring harness assembly is pre-installed, the operator can operate in a stable working environment without worrying about the movement of the operating table outer frame affecting the installation quality. At the same time, the stable operating table outer frame also provides protection for the installation mechanism 1 to accurately install the wiring harness assembly in its interior, making the entire assembly process more efficient, accurate and safe.

[0044] Further, as shown in Figure 3 The support 21 includes two fixed plates 221 arranged at intervals, the operating table outer frame is provided with a supporting leg, and the supporting leg corresponds to the support 21 one by one, the supporting leg is arranged between the two fixed plates 221 of the corresponding support 21, and the fastener 22 is threadedly connected with the nut after passing through the two fixed plates 221 and the supporting leg. This arrangement further enhances the fixing effect of the operating table outer frame, better resists external force and its own gravity, and ensures that the operating table outer frame remains absolutely stable during the entire pre-installation process.

[0045] In some embodiments, at least two supports 21 are arranged on the same stand 24, and the distance between the adjacent two supports 21 is adjustable along the first direction. It is worth noting that the first direction refers to the length direction of the stand 24, and also refers to the arrangement direction of the at least two supports 21 on the same stand 24.

[0046] The distance between the adjacent two supports 21 can be adjusted according to the distance between the two supporting legs on one side of the operating table outer frame, so as to adapt to different supporting leg distances and ensure the installation effect of the supporting leg and the support 21. Optionally, three or more supports 21 are arranged on the same stand 24, and the specific number of supports 21 is determined according to the number of supporting legs of the operating table outer frame. As shown in Figure 2 In this embodiment, two supports 21 are arranged on the upper end of the same stand 24, which can ensure the stability of the operating table outer frame.

[0047] In some embodiments, the distance between the two stands 24 is adjustable along a second direction, which is arranged at an angle with the first direction. In this embodiment, the second direction is the arrangement direction of the two stands 24, that is, the distance between the two stands 24 is adjustable. Preferably, the second direction is perpendicular to the first direction.

[0048] One of the two stands 24 is a first stand 241, and the other is a second stand 242, and the first stand 241 and the second stand 242 are both provided with the support 21. Optionally, the first stand 241 or the second stand 242 can be adjusted in the fixed position of the base 23 along the second direction. Optionally, the first stand 241 and the second stand 242 can both be adjusted in the fixed position of the base 23 along the second direction. Since the support 21 is arranged on the stand 24, by adjusting the distance between the two stands 24, the distance between the feet of the operating table outer frame can be adapted, and the mounting effect of the feet and the support 21 can be ensured.

[0049] As shown in Figure 2 The base 23 and the stand 24 are both built by profiled materials, the base 23 is in the shape of an I-beam, and the two stands 24 are both placed perpendicularly to the base 23 and are respectively placed at both ends of the base 23. In some embodiments, the first stand 241 and the second stand 242 have the same structure, which is convenient for processing. In some embodiments, the first stand 241 includes a first bracket 243, the second stand 242 includes a second bracket 244, the length of the first bracket 243 is less than the length of the second bracket 244, and the first stand 241 and the second stand 242 have the same structure except the length of the bracket. In order to adapt to the position of the feet of the operating table outer frame, the position of the feet of the operating table outer frame can be arranged reasonably according to the position of the feet of the operating table outer frame, so as to save materials while meeting the support requirements.

[0050] Further, the ends of the two stands 24 and the base 23 are both provided with end covers 25, which are made of plastic or metal materials. The end covers 25 play a protective role at the end of the metal parts, avoiding damage to the wiring harness assembly.

[0051] In this embodiment, the auxiliary assembly device further includes a lifting mechanism (not shown in the figure), which is configured to drive the mounting mechanism 1 to lift to adjust the relative position between the wiring harness assembly and the operating table outer frame. The lifting mechanism is installed on the mounting mechanism 1 or the supporting mechanism 2 and is arranged between the mounting mechanism 1 and the supporting mechanism 2. Since the size, shape and installation requirements of different wiring harness assemblies and operating table outer frames may be different, it is possible to fine-tune according to actual needs during installation, so as to ensure that the wiring harness assembly can be accurately installed at the appropriate position of the operating table outer frame, and improve the installation precision. The lifting mechanism can be a hydraulic lifting mechanism, a screw lifting mechanism, a chain lifting mechanism or a pneumatic lifting mechanism, which is not limited here.

[0052] The working process of the auxiliary assembly device of this embodiment is as follows:

[0053] First, the fixed beam is fixed on the connecting piece 12 of the installation mechanism 1, and the wire harness structure is fixed on the fixed beam;

[0054] Second, the fixed wire harness assembly and the installation mechanism 1 are placed into the supporting mechanism 2, then the operation table outer frame is fixed on the supporting mechanism 2, and the wire harness structure is installed inside the operation table outer frame;

[0055] Third, the operation table outer frame, the wire harness assembly and the auxiliary assembly device are installed to the central operation table area, the operation table outer frame is fixed, the auxiliary assembly device is removed, the fixed beam is fixed on the central operation table area, and the assembly of the wire harness is completed.

[0056] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not the limitation of the embodiments of the utility model. For the ordinary skilled in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the utility model. Here, all the embodiments need not and cannot be exhausted. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. An auxiliary assembly device for mounting wire harness assemblies onto a structure to be installed, characterized in that, include: Mounting mechanism (1), wherein the mounting mechanism (1) is detachably connected to the wire harness assembly; The support mechanism (2) includes a base (23) and two stands (24) connected to and spaced apart from the base (23). The two stands (24) are configured to support the structure to be installed. The installation mechanism (1) is disposed between the two stands (24) to install the wire harness assembly inside the structure to be installed.

2. The auxiliary assembly device according to claim 1, characterized in that, The installation mechanism (1) includes a frame (11) and a connector (12). The connector (12) is disposed on the frame (11), and the position of the connector (12) on the frame (11) is adjustable to connect the wire harness assembly accordingly.

3. The auxiliary assembly device according to claim 2, characterized in that, The wire harness assembly includes a wire harness structure and a fixing beam. The fixing beam is used to fix the wire harness structure and is detachably connected to the corresponding connector (12).

4. The auxiliary assembly device according to claim 3, characterized in that, At least part of the connector (12) includes a first connecting portion (122) and a supporting portion (121), the first connecting portion (122) and the supporting portion (121) being arranged at an angle, the first connecting portion (122) being configured to connect to the fixed crossbeam, and the supporting portion (121) being configured to support one end of the fixed crossbeam.

5. The auxiliary assembly device according to claim 2, characterized in that, Along the vertical direction, the frame (11) is provided with a plurality of the connectors (12).

6. The auxiliary assembly device according to claim 1, characterized in that, The stand (24) is provided with a support (21) and a fastener (22). The fastener (22) passes through the support (21) and the structure to be installed in sequence to fix the structure to be installed.

7. The auxiliary assembly device according to claim 6, characterized in that, The support (21) includes two fixed plates (221) spaced apart. The structure to be installed is provided with a support leg, and the support leg corresponds one-to-one with the support (21). The support leg is located between the two fixed plates (221) of the corresponding support (21). The fastener (22) passes through the two fixed plates (221) and the support leg and is threadedly connected to the nut.

8. The auxiliary assembly device according to claim 6, characterized in that, At least two supports (21) are provided on the same stand (24), and the distance between two adjacent supports (21) is adjustable along a first direction.

9. The auxiliary assembly device according to claim 6, characterized in that, The distance between the two supports (21) is adjustable along the second direction.

10. The auxiliary assembly device according to any one of claims 1 to 9, characterized in that, The auxiliary assembly device further includes a lifting mechanism configured to drive the installation mechanism (1) to lift and lower to adjust the relative position between the wire harness assembly and the structure to be installed.

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