Automatic unhooking hoist and method for large semi-closed tubular parts

Abstract

The present application relates to the field of crane sling equipment, in particular to a large semi-closed pipe type part automatic unhooking sling and method, the sling includes a boom and a counterweight plate, the counterweight plate is slidingly fitted and limited on the boom at the center, a plurality of V-shaped limiting mechanisms are hinged between the boom and the counterweight plate, which deform with the movement of the boom, and the V-shaped limiting mechanisms abut on the inner wall of the workpiece after contraction and deformation; the method includes moving the boom and the counterweight plate, allowing the boom and the V-shaped limiting mechanism in the stretched state to extend into the workpiece, while the counterweight plate contacts the surface of the workpiece and the counterweight plate always contacts the surface of the workpiece under gravity, then moving the boom and driving the V-shaped limiting mechanism to contract and deform, allowing the V-shaped limiting mechanism to abut on the inner wall of the workpiece for lifting, moving the boom downward, then driving the V-shaped limiting mechanism to stretch and deform, and pulling apart the boom, the counterweight plate and the V-shaped limiting mechanism to complete unhooking. The present application has fast lifting and unhooking speed, and the sling is not affected by the workpiece machining process and is more durable.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of crane sling equipment, in particular to a large semi-closed pipe type part automatic unhooking sling and method. BACKGROUND

[0002] The sling refers to the device for lifting heavy objects in hoisting machinery. The most commonly used sling equipment includes hooks, slings, steel wire ropes, and other includes rings, lifting suction cups, tongs, etc. The sling is widely used in the handling and loading of slabs in the slab yard and transportation of stations, yards and wharfs in steel smelting enterprises, such as the handling of large semi-closed pipe type parts.

[0003] The large semi-closed pipe type part generally refers to a workpiece with a diameter of more than 2 meters, a length of more than 1 meter, and a thin wall, and one end or both ends of the pipe are semi-closed and similar in shape, such as inner / outer drums and double toothed rings, etc. Such parts are prone to deformation during heat treatment, and are not easy to hoist and transport whether in hot or cold state.

[0004] At present, the hoisting and transportation of large semi-closed pipe type parts is through the use of a tray together with a hanging clamp to hoist the large semi-closed pipe type parts. In the process of hoisting and transporting the large semi-closed pipe type parts, the hanging clamp used is subjected to cold and hot cycles together with the large semi-closed pipe type parts, resulting in the following problems of the hanging clamp:

[0005] 1. The clamp requires high-temperature resistant material, which has a high cost but a limited service life;

[0006] 2. The clamp is heat treated together with the large semi-closed pipe type part, which occupies a large space, reduces the effective interval of the furnace, and causes high heating energy consumption due to the weight of the clamp itself;

[0007] 3. The hoisting is not convenient, the part is slow to leave the furnace, and the utilization rate of the hanging clamp is low. SUMMARY

[0008] The present application aims to provide a large semi-closed pipe type part automatic unhooking sling to solve the problem of the existing hanging clamp affecting part processing and low utilization rate.

[0009] The large semi-closed pipe type part automatic unhooking sling in the present application comprises a boom and a counterweight plate, the counterweight plate is slidingly fitted and limited on the boom at the center, a plurality of V-shaped limiting mechanisms that stretch or contract deform with the movement of the boom are hinged between the boom and the counterweight plate, and the V-shaped limiting mechanisms contract and deform to abut on the inner wall of the workpiece.

[0010] The beneficial effects of the present application are:

[0011] When hoisting the workpiece, the lifting boom and the counterweight plate are moved, the lifting boom and the V-shaped limiting mechanism in the stretching state are inserted into the workpiece, at the same time, the counterweight plate contacts the surface of the workpiece and the counterweight plate always contacts the surface of the workpiece under the gravity, then the lifting boom is moved and the V-shaped limiting mechanism is deformed to retract, the V-shaped limiting mechanism is abutted on the inner wall of the workpiece to hoist; when unhooking, the lifting boom is moved downward, the V-shaped limiting mechanism is deformed to stretch, the lifting boom, the counterweight plate and the V-shaped limiting mechanism are pulled apart to complete unhooking.

[0012] In the process of hoisting and unhooking, the lifting device has simple structure, convenient operation and high operation efficiency, and does not interfere with the workpiece processing; the hoisting and unhooking speed is fast, the lifting device is not affected by the workpiece processing process, is more durable, the processing requirement of the lifting device is reduced, the cost of the lifting device is reduced, the lifting device can perform other hoisting work after unhooking, and the utilization rate of the lifting device is high.

[0013] Further, the upper limiting plate and the lower protruding edge for limiting the counterweight plate are arranged on the lifting boom, the upper limiting plate is located on the top side of the lifting boom, and the lower protruding edge is located on the bottom side of the lifting boom.

[0014] The beneficial effect is that the counterweight plate is limited from the upper and lower directions on the lifting boom, and the counterweight plate does not separate from the lifting boom under the action of gravity during use, and is more stable during use.

[0015] Further, the upper limiting plate is annular, and the width of the upper limiting plate protruding from the surface of the lifting boom is twice the width of the lower protruding edge protruding from the surface of the lifting boom.

[0016] The beneficial effect is that the annular upper limiting plate can completely cover the aperture in sliding cooperation with the counterweight plate.

[0017] Further, the V-shaped limiting mechanism comprises upper and lower branch arms hinged together, the other end of the upper branch arm is hinged to the counterweight plate, and the other end of the lower branch arm is hinged to the lower protruding edge.

[0018] The beneficial effect is that the V-shaped limiting mechanism has simple structure, can quickly unhook after completing hoisting of the workpiece, and is convenient to operate.

[0019] Further, the counterweight plate is integrally formed with an abutting piece capable of abutting on the lower protruding edge, and the abutting piece is cylindrical and located at the center of the counterweight plate.

[0020] The beneficial effect is that the abutting piece can accurately limit the stroke of the moving lifting boom, avoid the workpiece shaking caused by different degrees of the V-shaped limiting mechanism abutting on the workpiece due to uncertain stroke of the lifting boom, improve the stability of hoisting the workpiece, and at the same time, the plumb distance between the counterweight plate and the V-shaped limiting mechanism during hoisting can avoid the counterweight plate always pressing on the workpiece to cause damage to the workpiece.

[0021] Furthermore, the weight of the counterweight plate is equal to 2-4 times the total weight of the upper and lower support arms.

[0022] The beneficial effects are: by setting the weight of the counterweight plate, it can ensure that the upper arm moves in an arc around the abutment plate, restricting the up and down movement of the upper arm, and ensuring that when the boom moves upward and drives the lower arm to move, the V-shaped limiting mechanism can retract freely before the lower protruding edge of the boom touches the counterweight plate abutment plate.

[0023] Furthermore, the counterweight plate is fixed with a plurality of lugs for lifting the wire rope, the lugs being evenly distributed around the center of the counterweight plate, and a through hole for lifting the wire rope is provided at the top of the lifting rod.

[0024] The beneficial effect is that the hooks make it easier to lift the object with steel wire rope.

[0025] Furthermore, the included angle range of the V-shaped limiting mechanism during operation is 25°-60°, the length of the upper support arm is less than the length of the lower support arm, the hinge point of the lower support arm connecting to the upper support arm is located on the side away from the boom, the hinge point on the lower support arm divides the lower support arm into two segments in a 1:3 ratio, the point on the upper support arm that contacts the workpiece after the V-shaped limiting mechanism retracts is on the side away from the boom, and the point on the upper support arm that contacts the workpiece after the V-shaped limiting mechanism retracts divides the upper support arm into two segments in a 1:2 ratio.

[0026] The beneficial effects are: the length of the upper arm is less than that of the lower arm, which ensures that the V-shaped limiting mechanism has two supports when the lifting device is working. The position settings of the hinge point between the upper and lower arms and the point where the upper arm contacts the workpiece also ensure that the entire V-shaped limiting mechanism will not move arbitrarily during the operation of the lifting device, thus improving the overall stability of the lifting device.

[0027] Automatic unhooking methods for large, semi-enclosed tubular parts include:

[0028] Step 1: Move the lifting device with the counterweight plate against the bottom surface of the upper limit plate and the V-shaped limiting mechanism in a stretched state to the workpiece, so that the lifting rod and the stretched V-shaped limiting mechanism extend into the workpiece, while keeping the counterweight plate in contact with the upper surface of the workpiece.

[0029] Step 2: Pull the boom upwards. The counterweight plate will always be in contact with the upper surface of the workpiece under the action of gravity. This will cause the boom to retract the V-shaped limiting mechanism and press against the inner wall of the workpiece. The counterweight plate will also press against the lower protrusion to lift the workpiece.

[0030] Step 3: After the workpiece is lifted, move the boom back into the workpiece so that the upper limit plate on the lifting device contacts the counterweight plate. At the same time, the V-shaped limit mechanism is stretched again, and the boom and counterweight plate are lifted as a whole to detach the lifting device from the workpiece.

[0031] The beneficial effects of this plan are:

[0032] The V-shaped limiting mechanism is stretched or contracted by the movement of the lifting rod, and the workpiece is lifted and unhooked. The lifting device does not need to move with the workpiece during processing, does not affect the processing procedure of the workpiece, improves the processing efficiency of the workpiece and the qualified rate of the workpiece, and makes the workpiece hanging efficient, low in labor intensity and convenient to operate.

[0033] Further, in step 2, when the V-shaped limiting mechanism is contracted, one end of the lower branch arm is moved upward by the lifting rod, and one end of the upper branch arm on the counterweight plate is stationary, so that the upper branch arm and the lower branch arm are mutually close and contracted.

[0034] The beneficial effect is that the V-shaped limiting mechanism is contracted by the arrangement of the upper branch arm and the lower branch arm, and the structure is simple. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a front view of the automatic unhooking lifting device for large semi-closed pipe type parts in the embodiment of the application;

[0036] Figure 2 It is a use state diagram of the automatic unhooking lifting device for large semi-closed pipe type parts in the embodiment of the application when moving to the workpiece;

[0037] Figure 3 It is a use state diagram of the automatic unhooking lifting device for large semi-closed pipe type parts in the embodiment of the application when moving into the workpiece;

[0038] Figure 4 It is a lifting process state diagram of the automatic unhooking lifting device for large semi-closed pipe type parts in the embodiment of the application after entering the workpiece;

[0039] Figure 5 It is a state diagram of the automatic unhooking lifting device for large semi-closed pipe type parts in the embodiment of the application when the counterweight plate of the workpiece after entering the workpiece is abutted against the lower convex edge;

[0040] Figure 6 It is a use state diagram of the automatic unhooking lifting device for large semi-closed pipe type parts in the embodiment of the application when lifting the workpiece;

[0041] Figure 7 It is a partial enlarged view of the automatic unhooking lifting device for large semi-closed pipe type parts in the embodiment of the application when contacting the workpiece. DETAILED DESCRIPTION

[0042] The following will be further described in detail through specific embodiments.

[0043] The reference signs in the drawings of the specification include: a traveling block auxiliary hook 1, a lifting ring 2, a steel wire rope 3, a traveling block main hook 4, a lifting boom 5, a counterweight plate 6, an upper supporting arm 7, a lower supporting arm 8, an upper limiting plate 9, a lower protruding edge 10, a hanging lug 11, and a resisting piece 12.

[0044] As shown in FIGS. 1-3, the automatic unhooking lifting device for large semi-closed tubular parts includes a lifting boom 5 and a counterweight plate 6. Figure 1 and Figure 2 The counterweight plate 6 is slidingly fitted and limited on the lifting boom 5 at the center, that is, a sliding hole is formed at the center of the counterweight plate 6, and the lifting boom 5 penetrates the sliding hole to be slidingly fitted. A plurality of V-shaped limiting mechanisms are hinged between the lifting boom 5 and the counterweight plate 6 and are stretched or contracted and deformed with the movement of the lifting boom 5. The V-shaped limiting mechanisms can be provided in 4-8 groups, and the V-shaped limiting mechanisms are abutted on the inner wall of the workpiece after being contracted and deformed.

[0045] The upper limiting plate 9 and the lower protruding edge 10 are fixed on the lifting boom 5 to limit the counterweight plate 6. The upper limiting plate 9 is fixed on the lifting boom 5 by welding, and is located at the top side of the lifting boom 5. The lower protruding edge 10 is located at the bottom side of the lifting boom 5, and is integrally formed with the lifting boom 5.

[0046] In an embodiment, the upper limiting plate 9 is annular, and the width of the upper limiting plate 9 protruding from the surface of the lifting boom 5 is twice the width of the lower protruding edge 10 protruding from the surface of the lifting boom 5.

[0047] In other embodiments, the upper limiting plate 9 includes a plurality of limiting strips, which are uniformly distributed around the lifting boom 5, and the number of the limiting strips is set according to actual needs.

[0048] The V-shaped limiting mechanism includes an upper supporting arm 7 and a lower supporting arm 8 hinged at one end. The other end of the upper supporting arm 7 is hinged to the counterweight plate 6, and the other end of the lower supporting arm 8 is hinged to the outer side wall of the lower protruding edge 10. The lower supporting arm 8 extends upward by a preset length from the hinged end of the upper supporting arm 7, and the distance between the end of the lower supporting arm 8 and the surface of the counterweight plate 6 is 30-40 cm, so as to ensure that the lower supporting arm 8 can contact the workpiece.

[0049] As shown in FIGS. 1-3, the automatic unhooking lifting device for large semi-closed tubular parts includes a lifting boom 5 and a counterweight plate 6. Figure 7As shown, the angle α between the upper arm 7 and the lower arm 8 of the V-shaped limiting mechanism ranges from 25° to 60°, the length of the upper arm 7 is less than that of the lower arm 8, the hinge point of the upper arm 7 on the lower arm 8 is located at the side away from the boom 5, and the hinge point of the lower arm 8 on the upper arm 7 divides the lower arm 8 into two sections in a ratio of 1:3, i.e., the distance between the hinge point of the lower arm 8 on the upper arm 7 and the end of the lower arm 8 contacting the workpiece is one fourth of the length of the lower arm 8, i.e., the length from the end of the lower arm 8 contacting the workpiece to the hinge point of the upper arm 7 is L3, the length of the lower arm 8 is L4, 4*L3=L4, the point of the upper arm 7 contacting the workpiece after the V-shaped limiting mechanism is contracted is away from the side of the boom 5, the point of the upper arm 7 contacting the workpiece after the V-shaped limiting mechanism is contracted divides the upper arm 7 into two sections in a ratio of 1:2, i.e., the length from the point of the upper arm 7 contacting the workpiece to the hinge point of the lower arm 8 is one third of the length of the upper arm 7, the length from the point of the upper arm 7 contacting the workpiece to the hinge point of the lower arm 8 is L1, the length of the upper arm 7 is L2, 3*L1=L2. The weight of the counterweight plate 6 is 2-4 times the total weight of all the upper arms 7 and the lower arms 8.

[0050] In another embodiment, the counterweight plate 6 is integrally formed with a pressing piece 12 capable of pressing against the lower protrusion 10, the other end of the upper arm 7 is hinged to the outer sidewall of the pressing piece 10, the pressing piece 12 is cylindrical and located at the center of the counterweight plate 6, i.e., the pressing piece 12 is located on the hole wall of the sliding hole, and the other end of the upper arm 7 is hinged to the pressing piece 12.

[0051] A plurality of hanging ears 11 for hoisting the steel wire rope 3 are welded on the counterweight plate 6, the number of the hanging ears 11 is set according to actual needs, the hanging ears 11 are uniformly distributed with the center of the counterweight plate 6 as the center, and a through hole for hoisting the steel wire rope 3 is formed at the top end of the boom 5.

[0052] The automatic unhooking method for large semi-closed pipe-shaped parts cooperates with the main hook 4 and the auxiliary hook 1 of the travelling crane to operate the hoisting of the workpiece by the hoist and unhooking, comprising:

[0053] Step 1, as Figure 2As shown, the wire rope 3 is tied to the lifting ring 2 through the through hole and the lug 11. The main hook 4 of the crane hooks onto the lifting ring 2 of the wire rope 3 of the boom 5, and the auxiliary hook 1 of the crane hooks onto the lifting ring 2 of the wire rope 3 of the lug 11. The main hook 4 and the auxiliary hook 1 of the crane move together, moving the lifting device, with the counterweight plate 6 pressed against the bottom surface of the upper limit plate 9 and multiple sets of V-shaped limiting mechanisms in a stretched state, to the workpiece. The length of the upper arm 7 of the V-shaped limiting mechanism is set as follows: The length of the upper support arm 7 is set to be less than that of the lower support arm 8, and the upper support arm 7 is hinged to the side of the lower support arm 8 away from the boom 5. The lower support arm 8 is divided into two sections in a 1:3 ratio through the hinge point between the upper support arm 7 and the lower support arm 8. The unhinged end of the upper support arm 7 is hinged to the counterweight plate 6, and the unhinged end of the lower support arm 8 is hinged to the outer wall of the lower convex edge 10 of the boom 5. In the stretched state, the angle between the upper support arm 7 and the lower support arm 8 of the V-shaped limiting mechanism is 60°. Figure 3 As shown, the boom 5 and the V-shaped limiting mechanism in a stretched state are inserted into the workpiece, while the counterweight plate 6 is kept in contact with the upper surface of the workpiece. The weight of the counterweight plate 6 is set to 2-4 times the total weight of the V-shaped limiting mechanism, so that the V-shaped limiting mechanism can stably contract and deform during the upward movement of the boom 5.

[0054] Step 2, as follows Figure 4 As shown, the crane's main hook 4 pulls the boom 5 upwards, and the counterweight plate 6 remains in contact with the upper surface of the workpiece under gravity. This causes the boom 5 to retract the V-shaped limiting mechanism. When the V-shaped limiting mechanism retracts, the boom 5 drives one end of the lower support arm 8 to move upwards. Under the gravity of the counterweight plate 6, one end of the upper support arm 7 on the counterweight plate 6 remains stationary, causing the upper support arm 7 and the lower support arm 8 to retract towards each other. Figure 5 As shown, the abutment 12 on the counterweight plate 6 abuts against the lower protruding edge 10, as... Figure 6 As shown, the lifting rod 5 continues to move, driving the lifting rod 5 and the counterweight plate 6 to move upward, so that the end of the lower support arm 8 abuts against the inner wall of the workpiece, and the upper support arm 7 contacts the workpiece. The upper support arm 7 is divided into two sections with a ratio of 1:2 through the point where the upper support arm 7 contacts the workpiece. In the retracted state, the angle between the upper support arm 7 and the lower support arm 8 is 25°. The counterweight plate 6 abuts against the lower convex edge 10 to lift the workpiece.

[0055] Step 3: After the workpiece is lifted, move the lifting rod 5 into the workpiece again so that the upper limit plate 9 on the lifting device contacts the counterweight plate 6. At the same time, the V-shaped limit mechanism is stretched again, and the lifting rod 5 and the counterweight plate 6 are lifted as a whole to detach the lifting device from the workpiece.

[0056] The scheme of the present application, when hoisting the workpiece, through the cooperation of the crane main hook 4 and the crane auxiliary hook 1 under stress, the jib 5 and the counterweight plate 6 are moved, the jib 5 and the V-shaped limiting mechanism in the stretching state are inserted into the workpiece, at the same time the counterweight plate 6 contacts the surface of the workpiece and the counterweight plate 6 always contacts the surface of the workpiece under the gravity, then through the movement of the crane main hook 4, the jib 5 is moved and the V-shaped limiting mechanism is driven to shrink and deform, the lower arm 8 of the V-shaped limiting mechanism is rested on the inner wall of the workpiece for hoisting; when unhooking, the jib 5 is moved downward, the V-shaped limiting mechanism is stretched and deformed, and the jib 5, the counterweight plate 6 and the V-shaped limiting mechanism are pulled apart to complete unhooking.

[0057] During the hoisting and unhooking process of the lifting appliance, the structure is simple, the operation is convenient, the operation efficiency is high, the workpiece does not need to be moved together, and the workpiece processing is not disturbed; the hoisting and unhooking speed is fast, the lifting appliance is not affected by the workpiece processing process, and is more durable; the lifting appliance does not need to be specially set, the processing requirement of the lifting appliance is reduced, and the cost of manufacturing the lifting appliance is reduced; after the unhooking of the lifting appliance is completed, other hoisting work can be carried out, and the utilization rate of the lifting appliance is high.

[0058] When improving the existing lifting appliance, due to the particularity of the machining process of the large semi-closed tubular part, the improvement of the lifting appliance will not be towards the improvement of canceling the tray and the structure of the lifting appliance itself, but generally towards the aspects of the material, heat conduction or the increase of the protection of the lifting appliance itself. The design of the weight of the counterweight plate and the setting of the length of the upper and lower arms of the lifting appliance of the present application have high requirements, generally need to be checked several times for strength, weight, and force arm calculation to meet the use requirements, and the technical personnel generally do not adopt this scheme after considering the design complexity. The scheme improves the structure of the lifting appliance itself, achieves the effect of the lifting appliance itself, and improves the stability of the lifting appliance hoisting the workpiece through the length ratio of the arms, and does not interfere with the machining process of the workpiece itself.

[0059] The above is only an embodiment of the present application, and the well-known specific structure and characteristics in the scheme are not described in detail. It should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should be regarded as the protection scope of the present application, and these will not affect the effect and practicality of the patent. The protection scope claimed in the present application should be subject to the content of its claims, and the specific implementation mode and the like in the description can be used to explain the content of the claims.

Claims

1. A large semi-closed tubular part automatic unhooking lifting device, characterized in that: The device comprises a boom and a counterweight plate, the counterweight plate is slidingly fitted and limited at the center of the boom, a plurality of V-shaped limiting mechanisms are hinged between the boom and the counterweight plate and are deformed by stretching or contraction when the boom moves, and the V-shaped limiting mechanisms are abutted on the inner wall of the workpiece after contraction; The upper limiting plate and the lower protruding edge are fixed on the boom to limit the counterweight plate, the upper limiting plate is located at the top side of the boom, the lower protruding edge is located at the bottom side of the boom, the V-shaped limiting mechanism comprises upper and lower branch arms which are hinged together, the other end of the upper branch arm is hinged on the counterweight plate, the other end of the lower branch arm is hinged on the lower protruding edge, the counterweight plate is integrally formed with an abutting piece which can be abutted on the lower protruding edge, the abutting piece is cylindrical and located at the center of the counterweight plate, the included angle of the V-shaped limiting mechanism during operation ranges from 25° to 60°, the length of the upper branch arm is less than that of the lower branch arm, the hinge point of the lower branch arm hinged on the upper branch arm is located away from the boom, the hinge point on the lower branch arm divides the lower branch arm into two sections with a ratio of 1:3, the point where the upper branch arm contacts the workpiece after the V-shaped limiting mechanism is contracted is away from the boom, and the point divides the upper branch arm into two sections with a ratio of 1:2; A plurality of hanging ears for hoisting the steel wire rope are fixed on the counterweight plate and are uniformly distributed with the center of the counterweight plate as the center, and a through hole for hoisting the steel wire rope is formed at the top end of the boom; The automatic unhooking method of the large semi-closed pipe-shaped part automatic unhooking lifting device comprises: Step 1: move the lifting device with the counterweight plate abutting on the bottom surface of the upper limiting plate and the V-shaped limiting mechanism in the stretched state to the workpiece, so that the boom and the V-shaped limiting mechanism in the stretched state are inserted into the workpiece, and the counterweight plate is kept in contact with the upper end surface of the workpiece; Step 2: pull the boom to move upward, the counterweight plate is always in contact with the upper end surface of the workpiece under the action of gravity, the boom drives the V-shaped limiting mechanism to contract and abut on the inner wall of the workpiece, and the counterweight plate abuts on the lower protruding edge to hoist the workpiece, when the V-shaped limiting mechanism contracts, one end of the lower branch arm is driven by the boom to move upward, and the other end of the upper branch arm on the counterweight plate is stationary, so that the upper branch arm and the lower branch arm are mutually close to each other and contract; Step 3: after the workpiece is hoisted, the boom is moved into the workpiece again, the upper limiting plate of the lifting device contacts the counterweight plate, the V-shaped limiting mechanism is stretched again, and the boom and the counterweight plate are pulled out as a whole to unhook the lifting device from the workpiece.

2. The automatic unhooking lifting device for large semi-closed tubular parts according to claim 1, characterized in that: The upper limiting plate is annular, and the width of the upper limiting plate protruding from the surface of the boom is twice the width of the lower protruding edge protruding from the surface of the boom.

3. The automatic unhooking lifting device for large semi-closed tubular parts according to claim 1, characterized in that: The weight of the counterweight plate is 2-4 times the total weight of the upper and lower branch arms.

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