Multi-layer stacking tool for marine transportation of large blades

Abstract

The utility model discloses a large-scale blade marine transportation multi-layer stacking tool which comprises a bottom plate, three stacking assemblies are arranged on one side of the bottom plate and located at the front end, the middle end and the rear end of the bottom plate respectively, and a bearing assembly and a supporting assembly are arranged on the bottom plate respectively. The bearing assemblies are arranged in the stacking assemblies at the front end and the rear end of the bottom plate correspondingly, and the supporting assembly is arranged in the stacking assembly at the middle end of the bottom plate. The device is convenient to use, it is ensured that the blades can be kept fixed in the marine transportation process, meanwhile, stacking transportation can be conducted, and the marine transportation cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power blade transportation, in particular to a multi-layer stacking tool for large blade offshore transportation. Background Art

[0002] Wind power generation is a clean energy source and a beneficial supplement to thermal power generation. With the development of the wind power industry, the size of wind turbine blades is also increasing. At present, the longest blade in China has reached 91 meters. In order to ensure the safe operation of the blades, it is required that there should be no bumps or damage during transportation.

[0003] The existing publication number CN218840399U discloses an adjustable wind turbine blade transport support frame, including a support truss, support rods and a flexible pad, which is characterized in that a top array of the support truss is arranged with a plurality of support rods that can be deformed under the action of gravity, the lower end of each support rod is fixedly set on the support truss, and each support rod has the same height in an unpressurized state; the flexible pad is integrally arranged on the top of each support rod, and the top of each support rod is fixedly connected to the bottom surface of the flexible pad, the top surface of the flexible pad is used to support the wind turbine blade, and when the wind turbine blade is placed, the flexible pad and each support rod are deformed under the weight of the wind turbine blade until the top surface of the flexible pad is completely fitted with the aerodynamic shape of the wind turbine blade.

[0004] In the above-mentioned existing solutions, the flexible pad can be deformed according to the blades of different models and sizes, so as to meet the support requirements of the support truss for different blades. However, there is still the following problem: the blades placed on the support truss are only supported but not fixed. They are easily shaken by ups and downs during transportation, and there is even a risk of falling off.

[0005] At the same time, the current sea transportation costs are high, and transporting large blades in a single layer will greatly increase the transportation costs of the blade company. Therefore, it is necessary to propose a marine transportation tooling that can stack blades in multiple layers to solve the current technical problems. Utility Model Content

[0006] The utility model aims to provide a multi-layer stacking tool for transporting large blades at sea, so as to solve the above technical problems.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a multi-layer stacking tool for marine transportation of large blades, comprising a bottom plate, one side of the bottom plate is provided with three groups of stacking components, the three groups of stacking components are respectively located at the front, middle and rear ends of the bottom plate, the bottom plate is respectively provided with a bearing component and a supporting component, the bearing components are respectively arranged in the stacking components at the front and rear ends of the bottom plate, and the supporting component is arranged in the stacking component at the middle end of the bottom plate; the stacking component comprises a bracket, the bracket is fixed to the bottom plate by bolts, silicone pads are fixedly arranged around the upper and lower ends of the bracket, hollow frames are respectively fixedly arranged around the top of the bracket, an embedding cylinder is fixedly connected in the hollow frames, storage cavities are respectively fixedly arranged around the bottom end of the bracket, a slide plate is fixedly arranged in the storage cavity, an embedding rod is fixedly arranged on one side of the slide plate close to the bottom plate, and an empty groove is opened on one side of the bottom plate close to the embedding rod; the bearing component comprises a bearing seat, the bearing seat is fixed to the bracket by bolts, support plates are symmetrically arranged on both sides of the bearing seat, first slide grooves are symmetrically opened on both sides of the support plate, and the first slide The cam is provided with a first sliding block for sliding connection on the groove, and a sliding rod is fixedly provided in the first sliding groove, and the sliding rod runs through two ends of the first sliding block, and the first sliding block is slidably connected to the sliding rod, and a first spring is provided between the first sliding block and the first sliding groove, and the first spring is sleeved on the sliding rod, and a flexible support plate is fixedly provided on one side of the first sliding block, and a front end clamping assembly and a tail end clamping assembly are respectively provided in the two bearing assemblies; the front end clamping assembly comprises a rotating rod, and the rotating rod is rotatably connected to the two ends of the supporting plate, and gears are fixedly provided at the two ends of the rotating rod, and racks are symmetrically provided at one end of the first sliding block near the flexible support plate, and the rack is meshed with the gear. A splint is fixedly provided at the middle end of the rotating rod, and a friction layer is fixedly provided on the one side of the splint near the flexible support plate; the tail end clamping assembly comprises a fixed frame, and the fixed frame is symmetrically fixedly connected to both sides of the bearing seat, and a hydraulic cylinder is hinged at the middle end of the fixed frame, and a pressure plate is rotatably connected at both ends of the supporting plate, and the output shaft of the hydraulic cylinder is hinged to one side of the pressure plate, and the pressure plate is an inclined structure, and a rubber pad is wrapped at one end of the pressure plate away from the supporting plate.

[0008] Preferably, a first limiting groove is symmetrically opened in the storage cavity, a first limiting block is fixedly provided on one side of the slide plate close to the first limiting groove, and the first limiting block is slidably connected to the first limiting groove, a second limiting groove is opened on both sides of the first limiting groove, and a clamping member is provided on both sides of the embedded rod close to the second limiting groove.

[0009] Preferably, the clamping member includes a clamping plate, which is an arc-shaped structure and is arranged on both sides of the outer wall of the embedded rod. The clamping plate is fixedly provided with a second limit block at one end close to the second limit groove, and the second limit block is embedded in the second limit groove and is slidably connected. The clamping plate is fixedly provided with a rubber pad on the side close to the embedded rod, and a screw is provided on the side of the clamping plate away from the rubber pad. The screw is rotatably connected to the clamping plate, and the screw passes through the storage cavity, and the screw is threadedly connected to the storage cavity, and a rotating block is fixedly provided on the end of the screw away from the clamping plate.

[0010] Preferably, a second sliding groove is provided on a side of the support plate close to the rack, a second sliding block is fixedly provided on a side of the rack close to the second sliding groove, and the second sliding block is slidably connected to the second sliding groove.

[0011] Preferably, the support assembly includes two mounting grooves, the two mounting grooves are fixed to the bracket by bolts, and a vertical cylinder is fixed in the mounting groove, a vertical rod is provided in the vertical cylinder, a second spring is provided between the vertical rod and the vertical cylinder, and a support plate is fixed at one end of the vertical rod away from the vertical cylinder.

[0012] Preferably, a limiting ring is fixedly provided at one end of the vertical rod close to the second spring, and a limiting ring is fixedly provided at one end of the vertical tube close to the supporting plate, and the limiting ring abuts against the inner side of the limiting ring.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] Through the cooperation of the load-bearing component and the supporting component, after the blade is lowered onto the load-bearing components at both ends, the weight of the blade presses the flexible support plate downward, and the flexible support plate deforms according to the curvature of the surface layer of the blade. At the same time, the first slider of the front clamping component slides down to drive the rack to move downward, and the gear rotates on the rack, driving the clamping plate to press against the upper surface of the blade. At the same time, the friction layer increases the friction between the clamping plate and the blade. The tail end clamping component moves the pressure plate toward the tail end of the blade through the hydraulic cylinder, and the tail end of the blade is supported by the rubber pad, thereby ensuring that the blade is more firmly and stably on the load-bearing component. At the same time, the supporting component plays a role in distributing the force at the middle end of the blade to avoid the blade being too long and only fixing the head and tail ends, and the middle end is easy to break.

[0015] The blades can be stacked in multiple layers through the stacking assembly. The bottom embedded rod of the second layer bracket is inserted into the top embedded tube of the first layer bracket. At the same time, the first layer bracket and the second layer bracket are enhanced with silicone pads after stacking, which reduces the number of sea transportation and reduces the cost of sea transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a combined schematic diagram of the overall structure of this embodiment;

[0018] Figure 2 is a schematic diagram of the combination of the carrier assembly and the stacking assembly of this embodiment;

[0019] Figure 3 is a partial cross-sectional view of the load-bearing assembly and the front-end clamping assembly of this embodiment;

[0020] Figure 4 is a partial cross-sectional view of the load-bearing assembly and the rear-end clamping assembly of this embodiment;

[0021] Figure 5 is a half-section view of the embedded rod of this embodiment;

[0022] Figure 6 is a top cross-sectional view of the storage chamber of this embodiment;

[0023] Figure 7 It is a partial cross-sectional schematic diagram of the support assembly of this embodiment.

[0024] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0025] 1. Bottom plate; 2. Bracket; 21. Silicone pad; 3. Hollow frame; 31. Embedded tube; 4. Storage cavity; 41. Slide plate; 42. Embedded rod; 43. First limiting groove; 44. First limiting block; 45. Second limiting groove; 5. Bearing seat; 51. Support plate; 511. Second slide groove; 52. First slide groove; 53. Slide rod; 54. First spring; 6. First slider; 61. Flexible support plate; 62. Rotating rod; 63. gear; 64. rack; 641. second slider; 65. clamping plate; 66. friction layer; 7. clamping plate; 71. second limit block; 72. rubber pad; 73. screw; 74. rotating block; 8. mounting groove; 81. vertical cylinder; 811. limit ring; 82. vertical rod; 821. limit ring; 83. second spring; 84. support plate; 9. fixing frame; 91. hydraulic cylinder; 92. pressure plate; 93. rubber pad. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] See also Figure 1-7 The utility model provides a technical solution: a multi-layer stacking tool for large blade marine transportation, comprising a bottom plate 1, one side of the bottom plate 1 is provided with three groups of stacking components, the three groups of stacking components are respectively located at the front, middle and rear ends of the bottom plate 1, the bottom plate 1 is respectively provided with a bearing component and a supporting component, the bearing components are respectively arranged in the stacking components at the front and rear ends of the bottom plate 1, and the supporting component is arranged in the stacking component at the middle end of the bottom plate 1;

[0028] The stacking assembly includes a bracket 2, which is fixed to the bottom plate 1 by bolts. Silicone pads 21 are fixedly provided around the upper and lower ends of the bracket 2. Hollow frames 3 are fixedly provided around the top of the bracket 2. An embedded tube 31 is fixedly connected inside the hollow frame 3. Storage cavities 4 are fixedly provided around the bottom end of the bracket 2. A slide plate 41 is provided inside the storage cavity 4. An embedded rod 42 is fixedly provided on the side of the slide plate 41 close to the bottom plate 1, and an empty groove is provided on the side of the bottom plate 1 close to the embedded rod 42.

[0029] The bearing assembly includes a bearing seat 5, which is fixed to the bracket 2 by bolts. Support plates 51 are symmetrically provided on both sides of the bearing seat 5. First slide grooves 52 are symmetrically provided on both sides of the support plate 51. A first slider 6 is slidably connected to the first slide groove 52. A slide rod 53 is fixedly provided in the first slide groove 52. The slide rod 53 runs through both ends of the first slider 6, and the first slider 6 is slidably connected to the slide rod 53. A first spring 54 is provided between the first slider 6 and the first slide groove 52, and the first spring 54 is sleeved on the slide rod 53. A flexible support plate 61 is fixedly provided on one side of the first slider 6. A front end clamping assembly and a rear end clamping assembly are respectively provided in the two bearing assemblies.

[0030] The front end clamping assembly includes a rotating rod 62, which is rotatably connected to the two ends of the support plate 51, and gears 63 are fixedly provided at both ends of the rotating rod 62. Racks 64 are symmetrically provided at both ends of the first slider 6 close to the flexible support plate 61, and the racks 64 are meshed with the gears 63. A clamping plate 65 is fixedly provided at the middle end of the rotating rod 62, and a friction layer 66 is fixedly provided on the side of the clamping plate 65 close to the flexible support plate 61.

[0031] The tail end clamping assembly includes a fixing frame 9, which is symmetrically fixedly connected to both sides of the bearing seat 5. A hydraulic cylinder 91 is hingedly provided at the middle end of the fixing frame 9. A pressure plate 92 is rotatably connected at both ends of the support plate 51. The output shaft of the hydraulic cylinder 91 is hinged to one side of the pressure plate 92. The pressure plate 92 is an inclined structure, and a rubber pad 93 is wrapped around the end of the pressure plate 92 away from the support plate 51.

[0032] Specifically, a first limiting groove 43 is symmetrically opened in the storage cavity 4, a first limiting block 44 is fixedly provided on one side of the slide plate 41 close to the first limiting groove 43, and the first limiting block 44 is slidably connected to the first limiting groove 43, a second limiting groove 45 is opened on both sides of the first limiting groove 43, and a clamping member is provided on both sides of the embedded rod 42 close to the second limiting groove 45. When the slide plate 41 moves downward in the storage cavity 4, the first limiting groove 43 limits the movement of the first limiting block 44 at the lowest end, thereby preventing the slide plate 41 from falling off from the storage cavity 4.

[0033] The lock body 7 is a pair of locks 71, 72 and 73, which are respectively fixed on the locking cam 71 and the locking cam 72 of the locking cam 7. The lock body 7 is a pair of locks 71 and 73 that are fixed on the locking cam 72 of the locking cam 7. The lock body 7 is a pair of locks 71 and the locking cam 72 of the locking cam 72 is fixed on the locking cam 72 of the locking cam 7. The lock body 7 is a pair of locks 71 and the locking cam 72 of the locking cam 72 is fixed on the locking cam 7

[0034] Specifically, a second slide groove 511 is opened on the side of the support plate 51 close to the rack 64, and a second slider 641 is fixedly provided on the side of the rack 64 close to the second slide groove 511. The second slider 641 is slidingly connected to the second slide groove 511, and the second slider 641 moves in the second slide groove 511 to enhance the stability of the gear 64 when moving.

[0035] Specifically, the support assembly includes two mounting grooves 8, which are fixed to the bracket 2 by bolts, and a vertical cylinder 81 is fixedly provided in the mounting groove 8, a vertical rod 82 is provided in the vertical cylinder 81, a second spring 83 is provided between the vertical rod 82 and the vertical cylinder 81, and a support plate 84 is fixedly provided at one end of the vertical rod 82 away from the vertical cylinder 81. The support assembly is arranged at the middle end of the blade, and the blade contacts the support plate 84, which can play a role in distributing the force when the blade is transported to avoid the middle end of the blade from breaking. At the same time, the height of the blade can be adjusted according to the cooperation of the vertical rod 82, the vertical cylinder 81 and the second spring 83.

[0036] Specifically, a limiting ring 821 is fixedly provided at one end of the vertical rod 82 close to the second spring 83, and a limiting ring 811 is fixedly provided at one end of the vertical tube 81 close to the support plate 84, and the limiting ring 821 abuts against the inner side of the limiting ring 811, and the limiting ring 821 abuts against the limiting ring 811 to play a limiting role, thereby preventing the vertical rod 82 from falling off from the vertical tube 81.

[0037] A specific application example of this embodiment is:

[0038] When the device is in use, the bearing assembly is fixed to the stacking assembly in advance, and the stacking assembly is adjusted and fixed on the bottom plate 1 according to the length of the blade. After the crane lifts the blade and moves it above the device, it slowly falls and places the head and tail ends of the blade on the bearing assembly respectively. The blade fits with the flexible support plate 61, and the flexible support plate 61 deforms itself according to the curvature of the outer wall of the blade. At the same time, the blade pushes the flexible support plate 61 downward, and the first slider 6 of the front clamping assembly drives the rack 64 to move downward, and the gear 63 rotates on the rack 64, so that the rotating rod 62 drives the clamping plate 65 to rotate toward the direction of the blade until the friction layer 66 is against the outer wall of the blade. The tail end clamping assembly moves the pressure plate 92 toward the tail end of the blade through the hydraulic cylinder 91, and the tail end of the blade is pressed through the rubber pad 93; the support plate 84 of the support assembly fits with the outer wall of the middle end of the blade to play a supporting role.

[0039] The above steps are steps for using the first layer blade transport device. After fixing two bearing components and one supporting component on the three stacking components, the rotating block 74 is rotated to drive the screw 73 to drive the clamping plate 7 to move to both sides of the embedding rod 42, so that the embedding rod 42 falls downward naturally, and the hollow frame 3 of the stacking component is hung by the crane to descend, and the three groups of stacking components are stacked on the first layer of stacking components, so that the embedding rod 42 is inserted into the embedding cylinder 31, and the first layer and the second layer of silicone pads 21 are fitted together, so that the stacking components can be stacked for use;

[0040] When it is necessary to remove the blades, the stacking assembly is removed from the top layer in sequence, the hydraulic cylinder 91 of the tail clamping assembly is reset, the pressure plate 92 is detached from the tail end of the blade, the blade is lifted by a crane and slowly detached from the flexible support plate 61, the first spring 54 generates a thrust to push the first slider 6 upward, so that the rack 64 drives the gear 63 to rotate and reset the clamp 65. After the top layer of blades is removed, the top layer of stacking assembly is removed, and after the bracket 2 is docked on the ground, the embedded rod 42 is parallel to the silicone pad 21 at the same time, and the screw 73 is driven to rotate by rotating the rotating block 74. At the same time, the screw 73 drives the clamping plate 7 to move toward the embedded rod 42 until the rubber pad 72 and the embedded rod 42 are in contact and clamped. The next layer of blades can be removed through this step.

[0041] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0043] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that modifications may be made to the embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-layer stacking tool for transporting large blades at sea, comprising a bottom plate (1), characterized in that: Three groups of stacking components are provided on one side of the bottom plate (1), and the three groups of stacking components are respectively located at the front, middle and rear ends of the bottom plate (1). A bearing component and a supporting component are respectively provided on the bottom plate (1). The bearing components are respectively arranged in the stacking components at the front and rear ends of the bottom plate (1), and the supporting components are arranged in the stacking components at the middle end of the bottom plate (1); The stacking assembly comprises a bracket (2), the bracket (2) being fixed to the bottom plate (1) by bolts, the upper and lower ends of the bracket (2) being fixedly provided with silicone pads (21), the top of the bracket (2) being fixedly provided with hollow frames (3), the hollow frames (3) being fixedly connected with embedded tubes (31), the bottom of the bracket (2) being fixedly provided with storage cavities (4), the storage cavities (4) being provided with slide plates (41), the side of the slide plates (41) close to the bottom plate (1) being fixedly provided with embedded rods (42), and the side of the bottom plate (1) close to the embedded rods (42) being provided with empty grooves; The bearing assembly comprises a bearing seat (5), the bearing seat (5) is fixed to the bracket (2) by bolts, support plates (51) are symmetrically provided on both sides of the bearing seat (5), first slide grooves (52) are symmetrically provided on both sides of the support plate (51), a first slider (6) is slidably connected to the first slide groove (52), a slide rod (53) is fixedly provided in the first slide groove (52), the slide rod (53) passes through both ends of the first slider (6), and the first slider (6) is slidably connected to the slide rod (53), a first spring (54) is provided between the first slider (6) and the first slide groove (52), and the first spring (54) is sleeved on the slide rod (53), a flexible support plate (61) is fixedly provided on one side of the first slider (6), and a front end clamping assembly and a rear end clamping assembly are respectively provided in the two bearing assemblies; The front end clamping assembly comprises a rotating rod (62), the rotating rod (62) being rotatably connected to two ends of the support plate (51), gears (63) being fixedly provided at both ends of the rotating rod (62), racks (64) being symmetrically provided at both ends of the first sliding block (6) on one side close to the flexible support plate (61), the racks (64) being meshed with the gears (63), a clamping plate (65) being fixedly provided at the middle end of the rotating rod (62), and a friction layer (66) being fixedly provided on one side of the clamping plate (65) close to the flexible support plate (61); The tail end clamping assembly comprises a fixing frame (9), the fixing frame (9) is symmetrically fixedly connected to two sides of the bearing seat (5), a hydraulic cylinder (91) is hingedly provided at the middle end of the fixing frame (9), and a pressure plate (92) is rotatably connected at both ends of the support plate (51), an output shaft of the hydraulic cylinder (91) is hingedly connected to one side of the pressure plate (92), the pressure plate (92) is an inclined structure, and an end of the pressure plate (92) away from the support plate (51) is wrapped with a rubber pad (93).

2. The multi-layer stacking tooling for large blades transported at sea according to claim 1 is characterized by: A first limiting groove (43) is symmetrically provided in the storage cavity (4); a first limiting block (44) is fixedly provided on one side of the slide plate (41) close to the first limiting groove (43), and the first limiting block (44) is slidably connected to the first limiting groove (43); a second limiting groove (45) is provided on both sides of the first limiting groove (43); and a clamping member is provided on both sides of the embedded rod (42) close to the second limiting groove (45).

3. The multi-layer stacking tooling for large blades transported at sea according to claim 2 is characterized by: The clamping member comprises a clamping plate (7), the clamping plate (7) being an arc-shaped structure, and the clamping plate (7) being arranged on both sides of the outer wall of the embedded rod (42), and a second limiting block (71) being fixedly arranged at one end of the clamping plate (7) close to the second limiting groove (45), and the second limiting block (71) being embedded in the second limiting groove (45) for sliding connection, a rubber pad (72) being fixedly arranged at one side of the clamping plate (7) close to the embedded rod (42), a screw rod (73) being arranged at one side of the clamping plate (7) away from the rubber pad (72), the screw rod (73) being rotatably connected to the clamping plate (7), the screw rod (73) penetrating the storage cavity (4), and the screw rod (73) being threadedly connected to the storage cavity (4), and a rotating block (74) being fixedly arranged at one end of the screw rod (73) away from the clamping plate (7).

4. The multi-layer stacking tooling for large blades transported at sea according to claim 1 is characterized by: A second slide groove (511) is provided on a side of the support plate (51) close to the rack (64), a second slider (641) is fixedly provided on a side of the rack (64) close to the second slide groove (511), and the second slider (641) is slidably connected to the second slide groove (511).

5. The large blade offshore transport multi-layer stacking tooling according to claim 1 is characterized by: The support assembly comprises two placement grooves (8), the two placement grooves (8) are fixed to the bracket (2) by bolts, and a vertical cylinder (81) is fixedly provided in the placement grooves (8), a vertical rod (82) is provided in the vertical cylinder (81), a second spring (83) is provided between the vertical rod (82) and the vertical cylinder (81), and a support plate (84) is fixedly provided at one end of the vertical rod (82) away from the vertical cylinder (81).

6. The multi-layer stacking tooling for large blades transported at sea according to claim 5 is characterized by: A limiting ring (821) is fixedly provided at one end of the vertical rod (82) close to the second spring (83), and a limiting ring (811) is fixedly provided at one end of the vertical tube (81) close to the supporting plate (84), and the limiting ring (821) abuts against the inner side of the limiting ring (811).

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