Drill rod body automatic feeding and discharging device for friction welding machine

Abstract

The utility model discloses a drill rod body automatic feeding and discharging device for a friction welding machine, and relates to the technical field of friction welding machines. According to the drill rod body automatic feeding and discharging device for the friction welding machine, a drill rod is conveniently conveyed into a v-shaped frame in the middle of a main machine jaw of the double-end friction welding machine through the arranged first lifting table and the arranged upper sliding table to wait for welding, and during use, a lifting air cylinder is started to drive the first lifting table so that a fixed platform can be lifted, and the drill rod needing to be welded can be supported through a feeding claw; meanwhile, the drill rod welded by the main machine of the double-end friction welding machine can be supported out of the V-shaped frame in the middle of the device, then a platform air cylinder is started to drive an upper sliding table to move the drill rod needing to be welded to the position above the V-shaped frame of the device through a feeding claw, and then a lifting air cylinder is started to drive a fixing platform to reset so that the drill rod needing to be welded can fall into the V-shaped frame to be welded; and meanwhile, the welded drill rod can fall onto the discharging assembly for subsequent machining, the error rate is low, the labor intensity is small, and the requirement for efficient welding production can be met.

Description

TECHNICAL FIELD

[0001] The utility model relates to friction welding machine technical field, concretely is a kind of automatic feeding and discharging device for drill rod body of friction welding machine. BACKGROUND

[0002] Friction welding machine is a kind of equipment that generates heat energy in rotation, and then completes welding by proper pressure, and feeding and discharging device is mainly responsible for automatically feeding drill rod body to be welded into friction welding machine, and automatically unloading finished drill rod after welding.

[0003] Referring to the patent application disclosed in the patent application with publication number CN212682779U, a kind of friction welding machine with feeding mechanism, including machine body, machine body includes drill bit rotation part and drill rod operating part, drill rod is inserted into drill rod operating part horizontally, drill rod is parallel to drill rod operating part, the outer side of drill rod operating part away from drill bit rotation part is fixed with several mutually parallel support tables, the length direction of support table is perpendicular to the insertion direction of drill rod, the upper surface of support table is provided with containing groove, first support roller is rotatably connected in containing groove, the rotation axis of first support roller is parallel to the length direction of support table, the lower surface of support table is fixedly connected with the first drive device that is penetrated by it, first drive device is lifted for first support roller, the utility model has the effect that drill rod feeding is more convenient, to improve the working efficiency of friction welding machine.

[0004] However, the device of the above technology is realized by driving assembly to drive support roller to rise and drop to realize feeding, and after drilling, the drill rod needs to be taken out manually and then discharged, and the feeding and discharging mode of the existing device is mostly manual operation or semi-automatic device, which is easy to cause low operation efficiency, high error rate and high labor intensity, especially in mass production, manual feeding and discharging mode often affects production rhythm, and it is difficult to meet the needs of efficient welding production. UTILITY MODEL CONTENTS

[0005] In view of the deficiencies of the prior art, the utility model provides an automatic feeding and discharging device for drill rod body of friction welding machine, which solves the problems of the prior art, such as high error rate, high labor intensity and difficulty in meeting the needs of efficient welding production.

[0006] To achieve the above purpose, the utility model is implemented by the following technical solutions: an automatic feeding and discharging device for drill rod body of friction welding machine, comprising a double-head friction welding machine host for welding drill rod, further comprising:

[0007] The jaw feeding assembly is arranged in the inside of the double-end friction welding machine main machine and used for placing and taking out the drill pipes which are welded and need to be welded, the jaw feeding assembly comprises a lifting cylinder which is fixedly installed at the front side and the rear side of the welding station in the middle of the double-end friction welding machine main machine, the output end of the lifting cylinder is fixedly installed with a first lifting table, the top surface of the first lifting table is fixedly installed with a fixed platform, and the top surface of the fixed platform is provided with a limiting assembly to limit the position of the drill pipe and move the drill pipe to the welding station of the double-end friction welding machine main machine.

[0008] The drill pipe feeding assembly is arranged at the front side of the double-end friction welding machine main machine and used for feeding the drill pipe.

[0009] The discharging assembly is arranged at the rear side of the double-end friction welding machine main machine and used for collecting the welded drill pipe to facilitate subsequent continuous processing, and the drill pipes can be arranged in order to facilitate subsequent processing.

[0010] Preferably, the jaw feeding assembly further comprises two second buffer assemblies which are fixedly installed at the front side and the rear side of the double-end friction welding machine main machine and used for reducing the force generated when the first lifting table descends, and the opposite sides of the first lifting table are slidingly installed at the front side and the rear side of the double-end friction welding machine main machine to improve the stability of the lifting of the first lifting table.

[0011] Preferably, the limiting assembly comprises an upper sliding table which is slidingly installed on the top surface of the fixed platform and used for moving the drill pipe, the front end and the rear end of the top surface of the upper sliding table are fixedly installed with an upper feeding clamp which is used for limiting the position of the drill pipe, the top surface of the fixed platform is fixedly installed with a platform cylinder which is used for moving the upper sliding table, the output end of the platform cylinder is fixedly installed on the bottom surface of the upper sliding table, the front side and the rear side of the top surface of the fixed platform are fixedly installed with a first buffer assembly which is used for reducing the force generated when the upper sliding table moves horizontally, and the front side of the double-end friction welding machine main machine is fixedly installed with a pneumatic part which is used for controlling the extension and retraction of the platform cylinder and the lifting cylinder.

[0012] Preferably, the drill pipe feeding assembly comprises a first rack which is fixedly installed at the front side of the double-end friction welding machine main machine, the left end and the right end of the rear side of the first rack are fixedly installed with a U-shaped groove plate which is used for fixing the position of the drill pipe, the rear end of the left side and the right side of the first rack are fixedly installed with a clamping cylinder which is used for aligning the drill pipe on the U-shaped groove plate, the rear side of the inner cavity of the first rack is fixedly installed with a second lifting table, the inside of the first rack is provided with a feeding vibration plate, the inside of the first rack is movably installed with a feeding baffle which is used for limiting the position of the stored drill pipe, the inside of the first rack is movably hinged with a baffle cylinder which is used for moving the feeding baffle to realize feeding, the rear end of the left side and the right side of the first rack are fixedly installed with a first cylinder, and the output end of the first cylinder is fixedly installed with a push plate which is used for centrally placing the stacked drill pipe.

[0013] Preferably, the output end of the material blocking cylinder is movably connected to the bottom surface of the upper material blocking plate to drive the upper material blocking plate to move.

[0014] Preferably, the lower material assembly comprises a second rack fixedly installed at the rear side of the double-end friction welding machine main machine, the top surface of the second rack is fixedly installed with a plurality of inclined guide rails, the rear side of the top surface of the second rack is fixedly installed with a rear rack, the left and right sides of the rear rack are fixedly installed with second cylinders, and the output ends of the second cylinders are fixedly installed with positioning plates to press the welded drill pipe to center the drill pipe.

[0015] The utility model provides a kind of drill pipe body automatic feeding and discharging device for friction welding machine.Compared with prior art, it has the following beneficial effects:

[0016] (1), the drill pipe body automatic feeding and discharging device for friction welding machine, the first lifting platform and the upper slide table are set to conveniently convey drill pipe into the V-shaped frame in the middle of the double-end friction welding machine main machine jaw to wait for welding, when using, start lifting cylinder to drive the first lifting platform to make fixed platform rise, then the fixed platform will drive the upper slide table to be lifted by the upper material grabbing to the drill pipe on the drill pipe feeding assembly which needs to be welded, while the welded drill pipe of double-end friction welding machine main machine will be lifted out from the V-shaped frame in the middle of the double-end friction welding machine main machine jaw, then start platform cylinder to drive the upper slide table to move the drill pipe needing to be welded to the upper side of the V-shaped frame in the middle of the double-end friction welding machine main machine jaw, then start lifting cylinder to drive fixed platform to reset to make the drill pipe needing to be welded move to the inside of the V-shaped frame in the middle of the double-end friction welding machine main machine jaw for welding, while the welded drill pipe will fall on the lower material assembly for subsequent processing, with low error rate and small labor intensity, can meet the needs of efficient welding production.

[0017] (2), the drill pipe body automatic feeding and discharging device for friction welding machine, the first rack and the push plate are set to conveniently feed the drill pipe needing to be welded, when using, the drill pipe in bundle is placed on the rear of the upper material blocking plate between the push plate, then the first cylinder is started to drive the push plate to push to the center to align the drill pipe, then the material blocking cylinder is started to drive the upper material blocking plate to descend, at this time, the drill pipe rolls to the bottom under the action of gravity, then the second lifting platform is started to lift the bottom workpiece to a high point, the workpiece falls into the U-shaped groove plate along the inclined surface, then the clamping cylinder is started to push to the center to align the drill pipe, ensure that the center of workpiece and equipment center align, then it can wait for feeding, convenient and fast, good practicability. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the three-dimensional appearance schematic view of the utility model;

[0019] Figure 2It is the partial three-dimensional appearance schematic view of the utility model;

[0020] Figure 3 It is the three-dimensional appearance schematic view of the blanking assembly of the utility model;

[0021] Figure 4 It is the installation position appearance schematic view of the jaw blanking assembly of the utility model;

[0022] Figure 5 It is the front view three-dimensional appearance schematic view of the jaw blanking assembly of the utility model;

[0023] Figure 6 It is the rear view three-dimensional appearance schematic view of the jaw blanking assembly of the utility model;

[0024] Figure 7 It is the three-dimensional appearance schematic view of the drill rod blanking assembly of the utility model.

[0025] In the figure: 1-double head friction welding machine main machine, 21-jaw blanking assembly, 211-first buffer assembly, 212-fixed platform, 213-first lifting platform, 214-platform air cylinder, 215-lifting air cylinder, 216-upper sliding table, 217-feeding grab, 218-pneumatic part, 219-second buffer assembly, 22-drill rod blanking assembly, 221-first rack, 222-second lifting platform, 223-U-shaped groove plate, 224-clamping air cylinder, 225-feeding vibration plate, 226-feeding baffle, 227-material blocking air cylinder, 228-pushing plate, 229-first air cylinder, 23-blanking assembly, 231-second rack, 232-inclined guide rail, 233-rear frame, 234-second air cylinder, 235-positioning plate. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0027] Referring to Figures 1-7 The utility model provides two technical schemes:

[0028] The first embodiment: a drill rod body automatic blanking device for a friction welding machine, comprising a double head friction welding machine main machine 1 for welding drill rods, and the double head friction welding machine main machine 1 is an existing device, which will not be described in detail, and further comprising:

[0029] The jaw loading assembly 21 is arranged in the double-end friction welding machine main machine 1 for placing and taking out the welded and to-be-welded drill pipes, the jaw loading assembly 21 includes the lifting cylinder 215 fixedly installed on the front side and the rear side of the welding station in the middle of the double-end friction welding machine main machine 1, the output end of the lifting cylinder 215 is fixedly installed with the first lifting table 213, the top surface of the first lifting table 213 is fixedly installed with the fixed platform 212, and the lifting cylinder 215 can drive the first lifting table 213 to adjust the height of the fixed platform 212, the top surface of the fixed platform 212 is provided with a limiting assembly to limit the position of the drill pipe and move it to the welding station of the double-end friction welding machine main machine 1;

[0030] The drill pipe loading assembly 22 is arranged on the front side of the double-end friction welding machine main machine 1 to drive the drill pipe to be loaded;

[0031] The unloading assembly 23 is arranged on the rear side of the double-end friction welding machine main machine 1 to collect the welded drill pipes for subsequent continuous processing, and can arrange the drill pipes neatly for subsequent processing, the jaw loading assembly 21 further includes two second buffer assemblies 219 fixedly installed on the front and rear sides of the double-end friction welding machine main machine 1 to reduce the force generated when the first lifting table 213 descends, and the two second buffer assemblies 219 are slidingly installed on the front and rear sides of the double-end friction welding machine main machine 1 on the opposite sides of the first lifting table 213 to improve the stability of the lifting of the first lifting table 213, the limiting assembly includes the upper sliding table 216 slidingly installed on the top surface of the fixed platform 212 to drive the drill pipe to move, the upper sliding table 216 is fixedly installed with the loading grab 217 at the front and rear ends of the top surface to limit the position of the drill pipe, the top surface of the fixed platform 212 is fixedly installed with the platform cylinder 214 to drive the upper sliding table 216 to move, the output end of the platform cylinder 214 is fixedly installed on the bottom surface of the upper sliding table 216, and the platform cylinder 214 can drive the upper sliding table 216 to move to convey the drill pipe, the first buffer assembly 211 is fixedly installed on the front and rear sides of the top surface of the fixed platform 212 to reduce the force generated when the upper sliding table 216 moves horizontally, the pneumatic part 218 is fixedly installed on the front side of the double-end friction welding machine main machine 1 to control the extension and retraction of the platform cylinder 214 and the lifting cylinder 215, and the driving assembly can be connected through the pneumatic part 218 to control the operation of the platform cylinder 214 and the lifting cylinder 215.

[0032] The first lifting platform 213 and the upper sliding platform 216 are set to facilitate the conveying of the drill pipe into the V-shaped frame between the jaws of the double-end friction welding machine main machine 1 for welding. When in use, the lifting cylinder 215 is started to drive the first lifting platform 213 to lift the fixed platform 212, and then the fixed platform 212 drives the upper sliding platform 216 to lift the drill pipe to be welded on the drill pipe feeding assembly 22 through the feeding clamp 217, and at the same time, the welded drill pipe is lifted out of the V-shaped frame between the jaws of the double-end friction welding machine main machine 1. Then the platform cylinder 214 is started to drive the upper sliding platform 216 to move the drill pipe to be welded to the upper side of the V-shaped frame between the jaws of the double-end friction welding machine main machine 1 through the feeding clamp 217. The lifting cylinder 215 is started again to drive the fixed platform 212 to reset so that the drill pipe to be welded is moved to the inside of the V-shaped frame between the jaws of the double-end friction welding machine main machine 1 for welding. At the same time, the welded drill pipe falls on the discharging assembly 23 for subsequent processing. The error rate is low, the labor intensity is small, and the demand for efficient welding production can be met.

[0033] The second embodiment has the main difference from the first embodiment that the drill rod feeding assembly 22 comprises a first rack 221 fixedly installed on the front side of the double-end friction welding machine main machine 1, U-shaped groove plates 223 for fixing the position of the drill rod are fixedly installed on the left and right ends of the rear side of the first rack 221, clamping air cylinders 224 for aligning the drill rods on the U-shaped groove plates 223 are fixedly installed on the rear ends of the left and right sides of the first rack 221, and the drill rods inside the rear rack 233 are centrally placed by moving the clamping air cylinders 224 to the opposite side, a second lifting platform 222 is fixedly installed on the rear side of the inner cavity of the first rack 221, a feeding vibration plate 225 is arranged in the first rack 221, a feeding baffle 226 for limiting the position of the stored drill rod is movably installed in the first rack 221, a material blocking air cylinder 227 for driving the feeding baffle 226 to move to realize feeding is movably hinged in the first rack 221, first air cylinders 229 are fixedly installed on the rear ends of the left and right sides of the first rack 221, push plates 228 for centrally placing the stacked drill rods are fixedly installed on the output ends of the first air cylinders 229, the output ends of the material blocking air cylinder 227 are movably hinged on the bottom surface of the feeding baffle 226 for driving the feeding baffle 226 to move, the output ends of the first air cylinders 229 are movably penetrated through the outer side of the first rack 221 and fixedly installed on one side of the push plate 228 for driving the push plate 228 to move and push the drill rod to align, and the drill rods inside the first rack 221 are centrally placed by moving the push plate 228 to the opposite side by starting the first air cylinders 229, the feeding assembly 23 comprises a second rack 231 fixedly installed on the rear side of the double-end friction welding machine main machine 1, a plurality of inclined guide rails 232 are fixedly installed on the top surface of the second rack 231, and the top surfaces of the plurality of inclined guide rails 232 are inclined from front to back, and the drill rods can be rolled backward by gravity, a rear rack 233 is fixedly installed on the top surface of the second rack 231, second air cylinders 234 are fixedly installed on the left and right sides of the rear rack 233, positioning plates 235 are fixedly installed on the output ends of the second air cylinders 234 for pressing the welded drill rods to make the drill rods central, and the drill rods are centrally placed by moving the positioning plates 235 to the opposite side by starting the second air cylinders 234, so that the robot can grab other stations or other operations in the subsequent process.

[0034] The first rack 221 and the push plate 228 are arranged to facilitate feeding of the drill rods to be welded, and when in use, the bundled drill rods are placed behind the feeding baffle 226 between the push plates 228, and then the lifting tool is withdrawn, the first air cylinders 229 are started to drive the push plates 228 to the center to align the drill rods, the material blocking air cylinder 227 is started to drive the feeding baffle 226 to descend, at this time the drill rods roll to the bottom under the action of gravity, the second lifting platform 222 is started to lift the bottom workpiece to a high point, the workpiece falls along the inclined surface into the U-shaped groove plate 223, the clamping air cylinders 224 are started to push the drill rods to the center to align, the center of the workpiece and the center of the equipment are aligned, and then the feeding can be waited, which is convenient, fast and good in practicability.

[0035] The contents not described in detail in the specification are all the prior art known to those skilled in the art, and the model parameters of the electric appliances are not specifically limited, and conventional equipment can be used.

[0036] In use, the user connects the device to the power supply, then places the bundled drill rod behind the feeding baffle 226 between the push plates 228, withdraws the hoisting tool, then starts the first cylinder 229 to drive the push plates 228 to push out to the center to align the drill rod, then starts the material blocking cylinder 227 to drive the feeding baffle 226 to descend, at this time the drill rod rolls to the bottom under the action of gravity, then starts the second lifting platform 222 to lift the bottom workpiece to a high point, the workpiece falls into the U-shaped groove plate 223 along the inclined surface, then starts the clamping cylinder 224 to push to the middle to align the drill rod, to ensure that the center of the workpiece is aligned with the center of the equipment, at this time the drill rod is above the feeding grab 217, then starts the lifting cylinder 215 to drive the first lifting platform 213 to lift the fixed platform 212, then the fixed platform 212 drives the upper sliding platform 216 to lift the drill rod that needs to be welded on the drill rod feeding assembly 22 through the feeding grab 217, at the same time, the double-head friction welding machine main machine 1 that has been welded is lifted out of the V-shaped frame in the middle of the double-head friction welding machine main machine 1 jaw, then starts the platform cylinder 214 to drive the upper sliding platform 216 to move the drill rod that needs to be welded to the upper side of the V-shaped frame in the middle of the double-head friction welding machine main machine 1 jaw through the feeding grab 217, then starts the lifting cylinder 215 to drive the fixed platform 212 to reset to move the drill rod that needs to be welded to the inside of the V-shaped frame in the middle of the double-head friction welding machine main machine 1 jaw for welding, at the same time, the welded drill rod falls onto and is placed on the inclined guide rail 232, at this time the drill rod rolls to the bottom along the inclined guide rail 232 under the action of gravity, then starts the second cylinder 234 to drive the positioning plate 235 to push out to the center to ensure that the workpiece is centered, so that the robot can grab other workstations or other operations subsequently.

[0037] It should be noted that, in the present document, the terms "first" and "second", and the like, merely serve to distinguish one entity or action from another, and do not necessarily require or imply any such actual relationship or order between such entities or actions. Also, the term "comprises", "comprising", or any other variant thereof, is intended to cover non-exclusive inclusions, such that a process, method, article, or apparatus that comprises a list of elements does not only include those elements, but can also include other elements not expressly listed, or inherent to such process, method, article, or apparatus.

[0038] Although the embodiments of the present application have been shown and described, it is to be understood that for the purpose of the present application, the changes- modifications- substitutions and variations of the embodiments can be made by those skilled in the art without departing from the spirit and principles of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A kind of automatic feeding and discharging device for drill pipe stem of friction welding machine, including double-end friction welding machine main machine (1) for welding drill pipe, characterized by: Also include: The jaw loading assembly (21) is arranged in the double-end friction welding machine main machine (1) for placing and taking out the welded and need to be welded drill pipe, the jaw loading assembly (21) includes fixedly installed in the double-end friction welding machine main machine (1) middle welding station front and rear side lifting cylinder (215), the output end of the lifting cylinder (215) is fixedly installed with the first lifting platform (213), the top surface of the first lifting platform (213) is fixedly installed with the fixed platform (212), the top surface of the fixed platform (212) is provided with a limiting assembly to limit the position of the drill pipe to move to the welding station of the double-end friction welding machine main machine (1); The drill pipe loading assembly (22) is arranged in the front side of the double-end friction welding machine main machine (1) to drive the drill pipe to load; The unloading assembly (23) is arranged in the rear side of the double-end friction welding machine main machine (1) for collecting the welded drill pipe to facilitate subsequent processing, and the drill pipe can be arranged neatly to facilitate subsequent processing.

2. The automatic feeding and discharging device for drill pipe bodies of a friction welding machine according to claim 1, characterized in that: The jaw loading assembly (21) further includes two second buffer assemblies (219) fixedly installed on the front and rear sides of the double-end friction welding machine main machine (1) to reduce the force generated when the first lifting platform (213) descends, the opposite sides of the first lifting platform (213) are slidingly installed on the front and rear sides of the double-end friction welding machine main machine (1) to improve the stability of the first lifting platform (213) lifting.

3. The automatic feeding and discharging device for drill pipe bodies of a friction welding machine according to claim 1, characterized in that: The limiting assembly includes an upper sliding table (216) slidingly installed on the top surface of the fixed platform (212) to drive the drill pipe to move, the front and rear ends of the top surface of the upper sliding table (216) are fixedly installed with an upper loading grab (217) to limit the position of the drill pipe, the top surface of the fixed platform (212) is fixedly installed with a platform cylinder (214) to drive the upper sliding table (216) to move, the output end of the platform cylinder (214) is fixedly installed on the bottom surface of the upper sliding table (216), the front and rear sides of the top surface of the fixed platform (212) are fixedly installed with a first buffer assembly (211) to reduce the force generated when the upper sliding table (216) moves horizontally, the front side of the double-end friction welding machine main machine (1) is fixedly installed with a pneumatic part (218) to control the extension and retraction of the platform cylinder (214) and the lifting cylinder (215).

4. The automatic feeding and discharging device for drill pipe bodies of a friction welding machine according to claim 1, characterized in that: The drill pipe feeding assembly (22) comprises a first rack (221) fixedly installed on the front side of the double-end friction welding machine main machine (1), U-shaped groove plates (223) for fixing the position of the drill pipe are fixedly installed on the left and right ends of the rear side of the first rack (221), clamping air cylinders (224) for aligning the drill pipe on the U-shaped groove plates (223) are fixedly installed on the rear ends of the left and right sides of the first rack (221), a second lifting platform (222) is fixedly installed on the rear side of the inner cavity of the first rack (221), a feeding vibration plate (225) is arranged in the first rack (221), a feeding baffle (226) for limiting the position of the stored drill pipe is movably installed in the first rack (221), a baffle air cylinder (227) for driving the feeding baffle (226) to move to realize feeding is movably hinged to the first rack (221), first air cylinders (229) are fixedly installed on the rear ends of the left and right sides of the first rack (221), and push plates (228) for centrally placing the stacked drill pipe are fixedly installed on the output ends of the first air cylinders (229).

5. The automatic feeding and discharging device for drill pipe bodies of a friction welding machine according to claim 4, characterized in that: The output end of the baffle air cylinder (227) is movably hinged to the bottom surface of the feeding baffle (226) for driving the feeding baffle (226) to move, the output end of the first air cylinder (229) is movably penetrated through the outer side of the first rack (221) and fixedly installed on one side of the push plate (228) for driving the push plate (228) to move and push the drill pipe to align the drill pipe.

6. The automatic feeding and discharging device for drill pipe bodies of a friction welding machine according to claim 1, characterized in that: The feeding assembly (23) comprises a second rack (231) fixedly installed on the rear side of the double-end friction welding machine main machine (1), a plurality of inclined guide rails (232) are fixedly installed on the top surface of the second rack (231), a rear rack (233) is fixedly installed on the rear side of the top surface of the second rack (231), second air cylinders (234) are fixedly installed on the left and right sides of the rear rack (233), and positioning plates (235) are fixedly installed on the output ends of the second air cylinders (234) for extruding the welded drill pipe to centrally place the drill pipe.

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