A connector for power transmission line engineering

Abstract

The present invention relates to the technical field of connection shackles for power transmission line projects, and more specifically, to a connector for power transmission line projects. The connector comprises a connector body, with a first opening and a second opening respectively formed at both ends in the length direction of the connector body; a pin is provided at the ends of the first opening and the second opening for insertion along the width direction of the connector body; the pins at the first opening and the second opening are parallel to each other; the side walls of the first opening are used to enclose together with the pin to form a first connection area, and the first connection area is used to be limitedly connected to the hanging point hole of the transmission tower; the side walls of the second opening are used to enclose together with the pin to form a second connection area, and the second connection area is used to be limitedly connected to the end of the wire rope. In the present invention, the connector body is not easily subjected to large lateral torques, thereby better avoiding deformation and damage.

Description

Technical Field

[0001] The present invention relates to the technical field of connectors for power transmission line projects, and in particular to a connector for power transmission line projects. Background Art

[0002] In the construction of transmission lines, shackles are a very commonly used connection tool, mainly used to connect lifting pulleys, line-laying pulleys, etc., and are also a common force-bearing tool.

[0003] During use, shackles are prone to lateral forces due to changes in the wire rope's pulling direction. This can easily cause deformation and, in severe cases, cause the load to fall. According to Section 8.3.6.2 of the "State Grid Corporation of China Electric Power Construction Safety Work Regulations Part 2: Lines" (Q / GDW11957.2-2020), shackles must not be subjected to lateral forces.

[0004] In order to avoid the situation where existing shackles are prone to lateral force during construction, especially at the hanging holes of the tower construction holes, which poses a safety hazard, it is necessary to specially manufacture tools for transmission line projects to avoid lateral force on shackles based on common on-site construction methods. Summary of the Invention

[0005] The present invention provides a connector for power transmission line engineering, which can overcome certain defects of the prior art.

[0006] According to the present invention, a connector for a power transmission line project includes a connector body, with a first open opening and a second open opening respectively formed at both ends of the connector body in the length direction; a pin shaft is provided at the ends of the first opening and the second opening for insertion along the width direction of the connector body; the pin shafts at the first opening and the second opening are parallel to each other; the side wall of the first opening is used to enclose together with the pin shaft to form a first connection area, and the first connection area is used to be limitedly connected to the hanging point hole of the transmission tower; the side wall of the second opening is used to enclose together with the pin shaft to form a second connection area, and the second connection area is used to be limitedly connected to the end of the wire rope.

[0007] Specifically, the connector body in the present invention is different from the traditional shackle in that the traditional shackle adopts a single pin shaft structure, and the single pin shaft and the shackle itself are enclosed to form a single connection area, and then the connection area is sleeved on the fixed point (such as the hanging point hole) to complete the arrangement of the fixed point, thereby providing a stable pulling point for the wire rope end; the single connection area needs to take into account both the requirements of the fixed point and the requirements of installing the wire rope end. In order to be suitable for the fixed point, the shackle itself needs to be designed into an arc-shaped structure, but this will easily cause the wire rope end to slide and deviate along the arc to cause lateral force.

[0008] It is understandable that when the pulling direction of the wire rope is offset (it is originally pulled along the length direction of the connector body, but may be offset into an oblique direction), the end of the wire rope sleeved at the shackle is prone to move along the shackle and offset. When the direction of the pulling force is not in the same straight line as the fixed point, the fixed point can be understood as the fulcrum of the lever, and the pulling force will generate a lateral torque based on the fulcrum, which can easily cause deformation and damage to the shackle.

[0009] Furthermore, the connector body of the present invention uses two pins to form two independent connection areas. In this way, the first connection area can be used exclusively for the arrangement of fixing points such as hanging holes. The shape of the first connection area can be set according to the actual fixing point requirements, thereby not interfering with the setting of the second connection area.

[0010] In this case, the second connection area can only be used to connect and fix the end of the wire rope, so that the pin at the second connection area can serve as the connection end of the wire rope end; when the direction of the wire rope traction force changes, the end of the wire rope will only move along the pin, so it is not easy to deviate and form a large angle of lateral tension to avoid it;

[0011] Moreover, the present invention adopts the form of two independent connection areas, so that only the first connection area can be designed to be wider than the hanging hole, and the second connection area can be designed to be relatively compact to limit the movement of the end of the wire rope; in this way, when the pulling direction of the wire rope changes, the relative position between the first connection area and the hanging hole can also be pulled accordingly, and it is not easy to be stuck. After pulling, the position of the corresponding fulcrum will also change, and the fulcrum can also be kept consistent with the direction of the traction force as much as possible, and the fulcrum and the traction force direction are consistent or maintained at a smaller angle; at the same time, the wire rope can also be restricted to move along the pin shaft, so that it will not directly deviate to the position of the lateral side of the entire connector; in summary, the connector body will not be easily subjected to large lateral torques, thereby better avoiding deformation and damage.

[0012] Preferably, the side wall of the first opening is annular, and a pin seat for inserting the first pin shaft is provided at the first opening; the first pin shaft is used to cooperate with the hanging point hole, and the side wall of the first pin shaft is used to abut against the side wall of the hanging point hole.

[0013] Preferably, the side wall at the junction of the first opening and the pin seat is formed with an arc-shaped convex surface; the side of the convex surface far from the pin seat forms a steep end, and the side of the convex surface near the pin seat forms a gentle end; a downslope section is formed from the steep end of the convex surface to the gentle end of the convex surface, and the downslope section is used to abut against the inner wall of the hanging hole to form a guide.

[0014] Preferably, a stopper is protruded from the steep end of the convex surface, and a limiting angle is formed at the junction of the stopper and the steep end of the convex surface.

[0015] Preferably, the side wall of the second opening is U-shaped, and a pin seat for inserting the second pin is provided at the second opening. The side wall of the second pin located in the second connection area is used to fit with the ring at the end of the wire rope;

[0016] A first positioning pin hole extending along the thickness direction of the connector body is formed at the pin seat at the second through port, and a second positioning pin hole corresponding to the first positioning pin hole is formed at the second pin; the first positioning pin hole and the second positioning pin hole are used to jointly insert the same positioning pin shaft, and the positioning pin shaft is used to circumferentially position the second pin shaft.

[0017] Preferably, both sides of the second opening in the width direction are provided with limiting components, and the limiting components include a base and a support plate arranged in parallel, and the base is formed at the first side wall of the second opening.

[0018] Preferably, a first spring arranged along the width direction is provided between the support plate and the base, and an arc portion matching the second pin is formed on the side of the support plate close to the second pin, and the support plate is used to abut and cooperate with the ring at the end of the wire rope.

[0019] Preferably, the side wall in the length direction of the second opening is the second side wall, and the second side wall is formed with sliding grooves on both sides along the width direction of the connecting member body, and the depth direction of the sliding groove is consistent with the length direction; a sliding block is slidably arranged in the sliding groove, and a second spring is fixedly arranged at the bottom wall of the sliding groove, and the end of the second spring farthest from the bottom wall of the sliding groove is fixedly connected to the sliding block.

[0020] Preferably, a first inclined surface and a first plane are formed at one end surface of the sliding block near the plate, and a second inclined surface and a second plane are formed at one end of the plate near the sliding block. The second inclined surface is used to abut against and cooperate with the first inclined surface to drive the sliding block into the sliding groove; the first plane is used to abut against and cooperate with the second plane.

[0021] Preferably, the connector body is an integrally formed structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of the connector body, wire rope, and hanging point holes in Example 1;

[0023] Figure 2 This is a schematic structural diagram of the connector body in Example 1;

[0024] Figure 3 for Figure 2 A schematic structural diagram of the second pin shaft;

[0025] Figure 4 for Figure 2 A cross-sectional schematic diagram of ;

[0026] Figure 5 for Figure 2 Enlarged schematic diagram of point A in the middle. DETAILED DESCRIPTION

[0027] In order to further understand the content of the present invention, the present invention is described in detail with reference to the embodiments. It should be understood that the embodiments are merely for explanation of the present invention and are not intended to limit the present invention.

[0028] Example 1

[0029] This embodiment provides a connector for a power transmission line project, combined with Figure 1 The connector body 100 includes a first opening 110 and a second opening 120 formed at both ends of the connector body 100 in the longitudinal direction. The first opening 110 and the second opening 120 are both provided with a pin for insertion along the width direction of the connector body 100. The pins at the first opening 110 and the second opening 120 are parallel to each other.

[0030] The side wall of the first opening 110 is used to enclose together with the pin shaft to form a first connection area, and the first connection area is used to limit the connection with the hanging point hole 140 of the transmission tower. The side wall of the second opening 120 is used to enclose together with the pin shaft to form a second connection area, and the second connection area is used to limit the connection with the end of the wire rope 150.

[0031] Specifically, the connector body 100 in this embodiment differs from a traditional shackle in that: the traditional shackle adopts a single pin shaft structure, and the single pin shaft and the shackle itself enclose a single connection area, and then the connection area is sleeved on a fixed point (such as a hanging point hole 140) to complete the arrangement of the fixed point, thereby providing a stable pulling point for the end of the wire rope 150; the single connection area needs to take into account both the requirements of the fixed point and the requirements of installing the end of the wire rope 150. In order to be suitable for the fixed point, the shackle itself needs to be designed into an arc-shaped structure, but this will easily cause the end of the wire rope 150 to slide and deviate along the arc to cause lateral force.

[0032] It can be understood that when the pulling direction of the wire rope 150 is offset (it is originally pulled along the length direction of the connector body 100, and may be offset into an oblique direction), the end of the wire rope 150 that is sleeved on the shackle is prone to move along the shackle and offset. When the direction of the pulling force is not on the same straight line as the fixed point, the fixed point can be understood as the fulcrum of the lever, and the pulling force will generate a lateral torque based on the fulcrum, which can easily cause deformation and damage to the shackle.

[0033] Furthermore, the connector body 100 of this embodiment uses two pins to form two independent connection areas. In this way, the first connection area can be used exclusively for the arrangement of fixing points such as the hanging hole 140. The shape of the first connection area can be set according to the actual fixing point requirements, thereby not interfering with the setting of the second connection area.

[0034] In this case, the second connection area can only be used to connect and fix the end of the wire rope 150, so that the pin at the second connection area can serve as the connection end of the end of the wire rope 150; when the pulling force direction of the wire rope 150 changes, the end of the wire rope 150 will only move along the pin, so it is not easy to deviate and form a large angle of lateral tension to avoid it;

[0035] Moreover, in the present embodiment, the two connecting areas are independent, so that only the first connecting area can be designed to be wider than the hanging hole 140, and the second connecting area can be designed to be relatively compact to limit the movement of the end of the wire rope 150; in this way, when the pulling direction of the wire rope 150 changes, the relative position between the first connecting area and the hanging hole 140 can also be pulled accordingly, and it is not easy to be stuck. After pulling, the position of the corresponding fulcrum will also change, and the fulcrum can also be kept consistent with the pulling force direction as much as possible, and the fulcrum and the pulling force direction are consistent or maintained at a smaller angle; at the same time, the wire rope 150 can also be restricted to move along the pin shaft, so that it will not directly deviate to the position of the lateral side of the entire connector; in summary, the connector body 100 is not easily subjected to a large lateral torque, thereby better avoiding deformation and damage.

[0036] Furthermore, the specific structures of the first connection area and the second connection area are as follows:

[0037] In this embodiment, the side walls of the first opening 110 are enclosed in a ring shape, and a pin seat 130 for inserting the first pin shaft 160 is provided at the first opening 110; the first pin shaft 160 is used to be fitted with the hanging point hole 140, and the side walls of the first pin shaft 160 are used to abut against the side walls of the hanging point hole 140.

[0038] Specifically, the first through-opening 110, which is annular as a whole, can be preferably adjusted in position relative to the hanging hole 140, and the first pin shaft 160 can directly abut against the side wall of the hanging hole 140, and the abutting position is the position of the fulcrum. If the traction direction of the wire rope 150 changes, the force state of the entire connecting component changes. In this embodiment, if the side wall of the first through-opening 110 is annular, the abutting fulcrum position will also change under the action of the traction force. It can be understood that the traction force and the fulcrum can roughly maintain a diagonal state, thereby better avoiding the occurrence of lateral torque.

[0039] In this embodiment, combined with Figure 2 The side wall at the junction of the first opening 110 and the latch seat 130 is formed with an arc-shaped convex surface 210; the side of the convex surface 210 far from the latch seat 130 forms a steep end 211, and the side of the convex surface 210 close to the latch seat 130 forms a gentle end 212; the steep end 211 of the convex surface 210 to the gentle end 212 of the convex surface 210 forms a downslope section, which is used to abut against the inner side wall of the hanging hole 140 to form a guide.

[0040] Specifically, in this embodiment, a convex surface 210 is provided in the first opening 110, and the convex surface 210 is a downhill section as a whole. When the fulcrum is pulled by the traction force, the fulcrum will move along the side wall of the first opening 110. The convex surface 210 is formed at the junction of the first opening 110 and the pin seat 130, so that when the fulcrum moves out from the pin shaft, it will first move to the convex surface 210; at this time, since the convex surface 210 is convex as a whole, it is difficult for the fulcrum against the convex surface 210 to obtain a stable support, because if it is a concave surface, the fulcrum will be directly stuck in the concave surface.

[0041] Furthermore, since the fulcrum cannot obtain stable support at the convex surface 210, when the direction of the traction force is reset to positive pulling, the fulcrum loses the oblique traction force. Under the action of the positive traction force, the fulcrum will naturally return to the pin along the downhill section of the convex surface 210, thereby still being able to maintain consistency with the direction of the traction force to avoid lateral torque.

[0042] In this embodiment, a stopper 220 is protruded from the steep end 211 of the convex surface 210 , and a limiting angle 230 is formed at the junction of the stopper 220 and the steep end 211 of the convex surface 210 .

[0043] Specifically, the block 220 can better prevent the fulcrum from further separating from the convex surface 210 after moving along the convex surface 210, because the second connection area limits the position of the wire rope 150; if the fulcrum is offset too much after separating from the convex surface 210, even if the position offset of the wire rope 150 is not large, a large lateral torque will still be generated between the fulcrum and the traction force of the wire rope 150, thereby posing a hidden danger.

[0044] In this embodiment, the side wall of the second opening 120 is U-shaped, and a pin seat 130 for inserting the second pin shaft 240 is provided at the second opening 120. The side wall of the second pin shaft 240 located in the second connection area is used to fit with the ring 170 at the end of the wire rope 150;

[0045] A first positioning pin hole 410 extending along the thickness direction of the connector body 100 is formed at the pin seat 130 at the end of the second opening 120, and a second positioning pin hole 310 corresponding to the first positioning pin hole 410 is formed at the second pin; the first positioning pin hole 410 and the second positioning pin hole 310 are used to jointly insert the same positioning pin shaft 250, and the positioning pin shaft 250 is used to circumferentially position the second pin shaft 240.

[0046] Specifically, the end of the wire rope 150 can be directly sleeved on the second pin shaft 240 through the ring 170 to achieve connection, but since the second pin shaft 240 is screwed into the pin seat 130 by a thread, when the ring 170 at the end of the wire rope 150 moves along the second pin shaft 240, it may drive the second pin shaft 240 to rotate in the circumferential direction; therefore, in this embodiment, the second pin shaft 240 is positioned by the positioning pin shaft 250, and the limit position of the second pin shaft 240 screwed into the pin seat 130 is determined, so when in use, the second positioning pin hole 310 at the second pin shaft 240 can ensure that it corresponds to the position of the first positioning pin hole 410; it is only necessary to screw in the positioning pin shaft 250, and the thread at the positioning pin shaft 250 can ensure its own axial positioning.

[0047] In this embodiment, a limiting assembly 260 is provided on both sides of the second opening 120 in the width direction. The limiting assembly 260 includes a base 261 and a support plate 262 arranged in parallel. The base 261 is formed at the first side wall 270 of the second opening 120 .

[0048] Furthermore, the limiting assembly 260 in this embodiment can better limit the ring 170 at the end of the wire rope 150. Because if there is no limiting assembly 260, the ring 170 may move directly to the end of the second pin shaft 240 under the action of the traction force, so that the ring 170 may be stuck and the wire rope 150 continues to be pulled under the action of the traction force, which may cause the wire rope 150 to be pressed against the pin seat 130 at the second opening 120. The wire rope 150 itself forms an inflection point at the pin seat 130. If the angle formed by the wire ropes 150 on both sides of the inflection point is large, it is easy to cause the wire rope 150 to wear or even break, posing a safety hazard.

[0049] Therefore, a limiting assembly 260 is provided in this embodiment. When the collar 170 moves along the second pin shaft 240, the support plate 262 in the limiting assembly 260 will form an obstacle to the collar 170, and the collar 170 will not move directly to the end along the second pin shaft 240. Therefore, even if the wire rope 150 continues to deviate under the action of traction, the wire rope 150 will not directly press against the pin seat 130 at the second opening 120, thereby better avoiding the occurrence of an inflection point to protect the wire rope 150.

[0050] In this embodiment, a first spring 263 arranged along the width direction is provided between the support plate 262 and the base 261, and an arc-shaped portion 264 matching the second pin shaft 240 is formed on the side of the support plate 262 near the second pin shaft 240. The support plate 262 is used to abut and cooperate with the ring 170 at the end of the wire rope 150.

[0051] It is understandable that the first spring 263 can form a relief force on the collar 170 to prevent the collar 170 from deflecting too quickly. The arc portion 264 can be used to abut against the collar 170.

[0052] In this embodiment, the side wall of the second opening 120 in the length direction is the second side wall 280. Figure 4 A sliding groove 420 is formed on both sides of the second side wall 280 along the width direction of the connecting member body 100, and the depth direction of the sliding groove 420 is consistent with the length direction; a sliding block 290 is slidably arranged in the sliding groove 420, and a second spring 450 is fixedly arranged at the bottom wall of the sliding groove 420, and one end of the second spring 450 far from the bottom wall of the sliding groove 420 is fixedly connected to the sliding block 290.

[0053] In this embodiment, a first inclined surface 430 and a first plane 440 are formed at one end surface of the sliding block 290 near the plate 262, and a second inclined surface 510 and a second plane 520 are formed at one end of the plate 262 near the sliding block 290. The second inclined surface 510 is used to abut against and cooperate with the first inclined surface 430 to drive the sliding block 290 to move into the sliding groove 420; the first plane 440 is used to abut against and cooperate with the second plane 520.

[0054] Specifically, if the offset traction force is large, the collar 170 will also exert a large abutment force on the support plate 262 during its sliding process along the second pin 240. Furthermore, to ensure normal installation and removal of the second pin 240, a gap must exist between the curved portion 264 of the support plate 262 and the second pin 240. If the collar 170 exerts a large abutment force on the support plate 262, the collar 170 may become stuck in the gap, thereby affecting the subsequent normal movement of the collar 170.

[0055] The sliding block 290 in this embodiment can cooperate with the support plate 262. When the ring 170 rests on the support plate 262, if the resting force of the ring 170 is large enough, the support plate 262 will be pushed by the ring 170, and the pushed support plate 262 will come into contact with the sliding block 290; the second inclined surface 510 at the support plate 262 rests on the first inclined surface 430 at the sliding block 290 to press the sliding block 290 into the sliding groove 420; then, under the elastic force of the second spring 450, the first plane 440 of the sliding block 290 will rest tightly on the second plane 520 of the support plate 262. This causes the curved portion 264 of the support plate 262 to press against the second pin 240 to fill the gap, thereby preventing the collar 170 from getting stuck in the gap. When the collar 170 returns to its original position, the support plate 262 also returns to its original position under the force of the first spring 263. Simultaneously, the sliding block 290 also returns to its original position under the force of the second spring 450. The entire mechanism can automatically maintain a state of continuous use and automatic reset.

[0056] In this embodiment, the connector body 100 is an integrally formed structure.

[0057] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application based on one or several embodiments provided in the present application to obtain other embodiments, and these embodiments do not exceed the scope of protection of the present application.

[0058] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The embodiments shown in the embodiments are only part of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by the above and, without departing from the purpose of the present invention, designs a structure and embodiment similar to the technical solution without creatively designing, they shall fall within the scope of protection of the present invention.

Claims

1. A connector for a power transmission line project, characterized in that: The invention comprises a connector body (100), wherein the two ends of the connector body (100) in the length direction are respectively formed with an open first opening (110) and a second opening (120); the ends of the first opening (110) and the second opening (120) are both provided with a pin shaft for being inserted along the width direction of the connector body (100); the pin shafts at the first opening (110) and the second opening (120) are parallel to each other; the side wall of the first opening (110) is used to enclose together with the pin shaft to form a first connection area, and the first connection area is used to be limitedly connected to the hanging point hole (140) of the transmission tower; the side wall of the second opening (120) is used to enclose together with the pin shaft to form a second connection area, and the second connection area is used to be limitedly connected to the end of the wire rope (150); A limiting assembly (260) is provided on both sides of the second opening (120) in the width direction. The limiting assembly (260) includes a base (261) and a support plate (262) arranged in parallel. The base (261) is formed at the first side wall (270) of the second opening (120). A first spring (263) arranged along the width direction is provided between the back plate (262) and the base (261); The side wall of the second opening (120) in the length direction is the second side wall (280), and the second side wall (280) is formed with a sliding groove (420) on both sides along the width direction of the connector body (100), and the depth direction of the sliding groove (420) is consistent with the length direction; A sliding block (290) is slidably provided in the sliding groove (420), a second spring (450) is fixedly provided at the bottom wall of the sliding groove (420), and one end of the second spring (450) far from the bottom wall of the sliding groove (420) is fixedly connected to the sliding block (290); The sliding block (290) can cooperate with the supporting plate (262), and the supporting plate (262) can press the sliding block (290) into the sliding groove (420) when it is pressed against the sliding block (290). The second spring (450) can drive the sliding block (290) to press against the supporting plate (262) to press the supporting plate (262) against the pin.

2. A connector for a power transmission line project according to claim 1, characterized in that: The side wall of the first opening (110) is enclosed in a ring shape, and a pin seat (130) for inserting a first pin shaft (160) is provided at the first opening (110); the first pin shaft (160) is used to be sleeved and matched with the hanging point hole (140), and the side wall of the first pin shaft (160) is used to abut and match with the side wall of the hanging point hole (140).

3. A connector for a power transmission line project according to claim 2, characterized in that: The side wall at the junction of the first opening (110) and the latch seat (130) is formed with an arc-shaped convex surface (210); a side of the convex surface (210) far from the latch seat (130) forms a steep end (211), and a side of the convex surface (210) near the latch seat (130) forms a gentle end (212); a downslope section is formed from the steep end (211) of the convex surface (210) to the gentle end (212) of the convex surface (210), and the downslope section is used to abut against the inner side wall of the hanging hole (140) to form a guide.

4. A connector for a power transmission line project according to claim 3, characterized in that: A stopper (220) is formed protruding from the steep end (211) of the convex surface (210), and a limiting angle (230) is formed at the junction of the stopper (220) and the steep end (211) of the convex surface (210).

5. The connector for power transmission line engineering according to claim 1, characterized in that: The side wall of the second opening (120) is U-shaped, and a latch seat (130) for inserting the second pin shaft (240) is provided at the second opening (120). The side wall of the second pin shaft (240) located in the second connection area is used to be fitted with a ring (170) at the end of the wire rope (150); A first positioning pin hole (410) extending in the thickness direction of the connector body (100) is formed at the pin seat (130) at the end of the second through port (120), and a second positioning pin hole (310) corresponding to the first positioning pin hole (410) is formed at the second pin; the first positioning pin hole (410) and the second positioning pin hole (310) are used to jointly insert the same positioning pin shaft (250), and the positioning pin shaft (250) is used to circumferentially position the second pin shaft (240).

6. The connector for power transmission line engineering according to claim 1, characterized in that: An arc portion (264) matching the second pin shaft (240) is formed on one side of the support plate (262) near the second pin shaft (240). The support plate (262) is used to abut against the ring (170) at the end of the wire rope (150).

7. The connector for power transmission line engineering according to claim 1, characterized in that: A first inclined surface (430) and a first plane (440) are formed at one end surface of the sliding block (290) near the support plate (262); a second inclined surface (510) and a second plane (520) are formed at one end of the support plate (262) near the sliding block (290); the second inclined surface (510) is used to abut against the first inclined surface (430) to drive the sliding block (290) into the sliding groove (420); and the first plane (440) is used to abut against the second plane (520).

8. A connector for a power transmission line project according to any one of claims 1 to 7, characterized in that: The connector body (100) is an integrally formed structure.

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