Automatic welding machine for welding seam

Abstract

The invention belongs to the technical field of welding, and discloses an automatic welding machine for weld joints, which comprises a base, two groups of workpieces are placed in the middle of the top surface of the base, top frames are mounted on two sides of the top of the base, hydraulic cylinders are mounted at the tops of the top frames, and movable frames are mounted at telescopic ends of the hydraulic cylinders. A fixing frame is fixedly mounted on the inner side of the top frame, a mounting frame is mounted on the inner side of the fixing frame, and a welding gun is mounted in the mounting frame. A moving plate of the device continuously moves downwards, so that a first connecting plate and a second connecting plate rotate with the bottoms facing one side of the axis of a welding gun, pressing plates are driven to horizontally move towards one side of the axis of the welding gun, the left pressing plate and the right pressing plate and a buffering plate synchronously move in opposite directions, and therefore proper abutting pressure is provided for the opposite faces of two sets of workpieces, and the workpiece machining precision is improved. Different angles of the first connecting plate and the second connecting plate can generate different horizontal component forces on the pressing plate, and therefore the welding quality of workpieces is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of welding, and in particular relates to an automatic welding machine for welding seams. Background Art

[0002] Welding, also known as fusion, is a manufacturing process and technology that combines metals or other thermoplastic materials by heating, high temperature or high pressure. It is an important part of mechanical processing. When welding metal plate welds, the automatic welding machine generally fixes the two metal plates and drives the welding gun through a linear motor to aim at the weld formed by the two metal plates for automatic welding. Under the horizontal drive of the linear motor, the metal plates will be efficiently welded to complete the joining. However, in the prior art, the fixation of the metal plates is not good enough. Since the two metal plates to be combined need to remain in abutment and static state during welding, the prior art generally uses a rigid clamp to apply pressure to the surface of the metal plate, thereby generating friction and clamping force on the workpiece to keep the metal plate fixed. This rigid pressing method easily causes the abutment pressure of the metal plate joint surface to be uncontrollable, and the fixing force used for pressing on the metal plate surface cannot be effectively converted into pressure toward the contact surface of the metal plate. This may cause: the abutment pressure between the two fixed metal plates is too small, and gaps are easily generated under the action of internal stress during welding, resulting in substandard welding quality. Summary of the invention

[0003] The object of the present invention is to provide an automatic welding machine for welding seams to solve the problems raised in the above-mentioned background technology.

[0004] In order to achieve the above-mentioned purpose, the present invention provides the following technical scheme: an automatic welding machine for welding seams, comprising a base, two groups of workpieces are placed in the middle of the top surface of the base, top frames are installed on both sides of the top of the base, a hydraulic cylinder is installed on the top of the top frame, a moving frame is installed on the telescopic end of the hydraulic cylinder, a fixed frame is fixedly installed on the inner side of the top frame, a mounting frame is installed on the inner side of the fixed frame, a welding gun is installed inside the mounting frame, two groups of moving plates are symmetrically installed on the left and right sides of the bottom of the moving frame, two groups of connecting seats that are equidistantly distributed on the left and right are fixedly installed on the top of the inner side of the moving plate, a movable column is rotatably installed inside the connecting seat, and the outer surfaces of the two groups of the moving columns are movably sleeved with connecting plate 1 and connecting plate 2 in sequence, the connecting plate 1 and the connecting plate 2 are parallel to each other, the bottom of the connecting plate 2 is movably connected to a pressing plate through another group of connecting seats and movable columns, a reset mechanism is movably hinged between the moving plate and the pressing plate, and a buffer plate is fixedly connected to the bottom of the pressing plate.

[0005] As a preferred solution of the present invention, the mounting frame is located between the top of the inner wall of the moving frame and the top of the moving plate, a ball screw is rotatably installed inside the mounting frame, and is fixedly connected to guide rods located on both sides of the ball screw, a slider is threadedly installed on the outer surface of the ball screw, the slider is slidably installed on the outer surface of the guide rod, a telescopic rod is fixedly installed on the bottom of the slider, and the telescopic end of the telescopic rod is fixedly connected to the welding gun.

[0006] As a preferred solution of the present invention, multiple sets of guide columns are fixedly installed on the left and right sides of the top of the base, and multiple sets of guide grooves are opened at the bottom of the movable plate, and the guide columns are adapted to be inserted into the guide grooves.

[0007] As a preferred solution of the present invention, the cross-sectional shape of the movable plate is "L"-shaped, and the vertical portion of the inner side surface of the movable plate is in sliding contact with the side surface of the base.

[0008] As a preferred solution of the present invention, the reset mechanism includes a reset cylinder, the internal movable sleeve of the reset cylinder is provided with a reset spring and a reset column, the two ends of the reset spring are elastically connected to the top of the inner wall of the reset cylinder and the inner end of the reset column respectively, the outer end of the reset column is hinged to the upper surface of the pressing plate, and the top end of the reset cylinder is hinged to the top of the inner wall of the movable plate.

[0009] As a preferred solution of the present invention, the opposite surfaces of the two groups of workpieces abut against each other, and the two groups of buffer plates abut against the two groups of workpieces respectively.

[0010] As a preferred solution of the present invention, the vertical portion of the connecting plate 1 close to the inner side of the movable plate, the surfaces of the connecting plate 1 and the connecting plate 2 are always parallel to the axis of the reset mechanism.

[0011] As a preferred solution of the present invention, the connecting plate 1 and the vertical part of the movable plate form an angle of 30°, and when the side of the pressing plate abuts against the inner wall of the movable plate, the angle between the connecting plate 1 and the vertical part of the movable plate is greater than 0.

[0012] The beneficial effects of the present invention are as follows: 1. The device has been redesigned to change the way of generating fixed pressure on the workpiece so that it can obtain the best abutting pressure. The device is provided with symmetrically distributed moving plates on both sides of the top of the base, and connecting plates 1 and 2 that are parallel to each other are movably installed respectively. The connecting plates 1 and 2 are movably connected to the pressing plate in a horizontal state through the connecting seat and the movable column. When the moving plate drives the connecting plates 1, 2 and the pressing plate to move downward, the pressing plate and the buffer plate abut against the workpiece and generate vertical pressure to achieve the fixing function. At the same time, the moving plate continues to move downward, so that the connecting plates 1 and 2 generate a rotation with the bottom toward the side of the welding gun axis, driving the pressing plate to move horizontally toward the side of the welding gun axis. The left and right groups of pressing plates and buffer plates move toward each other synchronously, thereby providing suitable abutting pressure to the opposite surfaces of the two groups of workpieces. Different angles of the connecting plates 1 and 2 will generate different horizontal components of force on the pressing plates, thereby improving the welding quality of the workpieces.

[0013] 2. The device is also provided with a reset mechanism movably connected between the pressing plate and the top of the inner wall of the movable plate, which can help the pressing plate to automatically reset after fixing. When the movable plate drives the connecting plate 1, the connecting plate 2 and the pressing plate to move downward, the horizontal displacement of the pressing plate drives the reset column and the reset cylinder to rotate around the axis of the top hinge of the reset cylinder. At this time, the reset spring is stretched and offsets the inertia and impact force of the output power of the hydraulic cylinder, so that the pressing plate drives the buffer plate and the workpiece to abut, and at the same time provides fixing and abutting pressure, which helps to improve the stability of the device. The stretched reset column will drive the reset column to shrink into the interior of the reset cylinder after the movable plate is reset upward, and then drive the pressing plate to reset horizontally.

[0014] 3. This device utilizes the need to generate appropriate abutment force between the opposite surfaces of two groups of workpieces. The F-flat force generated by the left and right groups of pressing plates and buffer plates on the workpieces is equal in size and opposite in direction, and just abuts against each other, so that the workpieces do not shift when fixed. This device utilizes the symmetrical pressure F-slope generated by the mutually symmetrical connecting plates 1 and 2 on the left and right sides to make the device self-locking. After the workpiece is pressed and fixed, it cannot shift in the horizontal direction. The moving plate in the vertical direction provides the connecting plates 1, 2, pressing plates and buffer plates to firmly press the workpiece on the base, making the device more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front perspective schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the front appearance of the overall structure of the present invention; Figure 3 For the present invention Figure 2 A magnified schematic diagram of the structure at center A; Figure 4It is a front perspective cutaway schematic diagram of the overall structure of the present invention; Figure 5 For the present invention Figure 4 A magnified schematic diagram of the structure at B in the middle; Figure 6 It is a front cross-sectional schematic diagram of the base, the movable plate, the reset mechanism, the pressing plate, the buffer plate and the workpiece of the present invention; Figure 7 For the present invention Figure 6 A magnified schematic diagram of the structure at C in the middle; Figure 8 It is a schematic diagram of the structure of the fixing frame, the mounting frame, the ball screw, the guide rod, the sliding block, the telescopic rod and the welding gun of the present invention; Fig. 9 It is a schematic diagram of the separation of the connecting seat, the movable column, the connecting plate 1, the connecting plate 2, the reset mechanism, the pressing plate and the buffer plate of the present invention.

[0016] In the figure: 1. base; 2. top frame; 3. hydraulic cylinder; 4. moving frame; 5. moving plate; 6. guide groove; 7. guide column; 8. fixed frame; 9. mounting frame; 10. ball screw; 11. guide rod; 12. slider; 13. telescopic rod; 14. welding gun; 15. connecting seat; 16. movable column; 17. connecting plate 1; 18. connecting plate 2; 19. reset mechanism; 191. reset cylinder; 192. reset spring; 193. reset column; 20. pressing plate; 21. buffer plate; 22. workpiece. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] like Figures 1 to 9As shown, an embodiment of the present invention provides an automatic welding machine for a weld seam, comprising a base 1, two groups of workpieces 22 are placed in the middle of the top surface of the base 1, top frames 2 are installed on both sides of the top of the base 1, a hydraulic cylinder 3 is installed on the top of the top frame 2, a moving frame 4 is installed on the telescopic end of the hydraulic cylinder 3, a fixed frame 8 is fixedly installed on the inner side of the top frame 2, a mounting frame 9 is installed on the inner side of the fixed frame 8, a welding gun 14 is installed inside the mounting frame 9, two groups of moving plates 5 are symmetrically installed on the left and right sides of the bottom of the moving frame 4, and the top of the inner side of the moving plate 5 is fixedly installed on the inner side of the moving plate 5. Two groups of connecting seats 15 equidistantly distributed on the left and right are fixedly installed on the part, and movable columns 16 are rotatably installed inside the connecting seats 15. The outer surfaces of the two groups of movable columns 16 are movably sleeved with connecting plates 17 and 18 in sequence. The connecting plates 17 and 18 are parallel to each other. The bottom of the connecting plate 28 is movably connected to a pressing plate 20 through another group of connecting seats 15 and movable columns 16. A reset mechanism 19 is movably hinged between the movable plate 5 and the pressing plate 20. The bottom of the pressing plate 20 is fixedly connected to a buffer plate 21; like Figure 2 , Figure 3 As shown: when the connecting plate 17 and the connecting plate 2 18 move downward and bend, the pressure they exert on the pressing plate 20, the buffer plate 21 and the workpiece 22 is F inclined, which rotates through the movable column 16 and generates a horizontal component force F horizontal and a vertical component force F vertical. When the buffer plate 21 abuts against the upper surface of the workpiece 22, it generates F vertical on the workpiece 22. At this time, it is only necessary to adjust the downward moving distance of the movable plate 5 to adjust the size of F horizontal so that it can provide a suitable abutting pressure to the workpiece 22.

[0019] The device has been redesigned to change the way of generating fixed pressure on the workpiece 22 so that it can obtain the best abutting pressure. The movable plates 5 are symmetrically distributed on both sides of the top of the base 1, and the connecting plates 17 and 18 are movably installed in parallel with each other. The connecting plates 17 and 18 are movably connected to the horizontal pressing plate 20 through the connecting seat 15 and the movable column 16. When the movable plate 5 drives the connecting plates 17, 18 and the pressing plate 20 to move downward, the pressing plate 20 and the buffer plate 21 abut against the workpiece 22. At the same time, the movable plate 5 continues to move downward, causing the connecting plate 1 17 and the connecting plate 2 18 to rotate with their bottoms toward the side of the axis of the welding gun 14, driving the pressing plate 20 to move horizontally toward the side of the axis of the welding gun 14, and the left and right groups of pressing plates 20 and buffer plates 21 move toward each other synchronously, thereby providing suitable abutting pressure to the opposite surfaces of the two groups of workpieces 22. The different angles of the connecting plate 1 17 and the connecting plate 2 18 will produce different horizontal components of force on the pressing plate 20, thereby improving the welding quality of the workpiece 22.

[0020] The mounting frame 9 is located between the top of the inner wall of the moving frame 4 and the top of the moving plate 5. A ball screw 10 is rotatably installed inside the mounting frame 9, and is fixedly connected to guide rods 11 located on both sides of the ball screw 10. A slider 12 is threadedly installed on the outer surface of the ball screw 10. The slider 12 is slidably installed on the outer surface of the guide rod 11. A telescopic rod 13 is fixedly installed at the bottom of the slider 12. The telescopic end of the telescopic rod 13 is fixedly connected to a welding gun 14. The welding gun 14 moves downward under the drive of the telescopic rod 13 and moves to the welding height of the workpiece 22. The ball screw 10 drives the slider 12, so that it can drive the telescopic rod 13 and the welding gun 14 to move back and forth along the axis of the guide rod 11, thereby achieving a full coverage welding function for the welds produced by the abutment of the two groups of workpieces 22.

[0021] Among them, multiple sets of guide columns 7 are fixedly installed on the left and right sides of the top of the base 1, and multiple sets of guide grooves 6 are provided at the bottom of the movable plate 5, and the guide columns 7 are adapted to be inserted into the guide grooves 6; The guide column 7 is adapted to be inserted into the guide groove 6 , and when the moving plate 5 moves driven by the moving frame 4 and the hydraulic cylinder 3 , it can provide a guiding function to maintain the stability of the moving plate 5 during movement.

[0022] The cross-sectional shape of the movable plate 5 is "L"-shaped, and the vertical portion of the inner side of the movable plate 5 is in sliding contact with the side of the base 1; The vertical portion of the inner side of the movable plate 5 is slidably abutted against the side of the base 1, and cooperates with the guide column 7 and the guide groove 6 to further improve the stability of the movable plate 5. The cross-sectional shape of the movable plate 5 is "L"-shaped, which is inverted on both sides of the top of the base 1 and is symmetrically distributed on the left and right. This design enables two sets of connecting seats 15 and movable columns 16 to be installed on the top of its inner wall, and to rotatably support connecting plate 1 17 and connecting plate 2 18.

[0023] The reset mechanism 19 includes a reset cylinder 191, and a reset spring 192 and a reset column 193 are movably sleeved inside the reset cylinder 191. The two ends of the reset spring 192 are elastically connected to the top of the inner wall of the reset cylinder 191 and the inner end of the reset column 193, respectively. The outer end of the reset column 193 is hinged to the upper surface of the pressing plate 20, and the top of the reset cylinder 191 is hinged to the top of the inner wall of the moving plate 5. The device is also provided with a reset mechanism 19 movably connected between the pressing plate 20 and the top of the inner wall of the movable plate 5, which can help the pressing plate 20 to automatically reset after the fixation is completed. When the movable plate 5 drives the connecting plate 1 17, the connecting plate 2 18 and the pressing plate 20 to move downward, the horizontal displacement of the pressing plate 20 drives the reset column 193 and the reset cylinder 191 to rotate around the axis of the top hinge of the reset cylinder 191. At this time, the reset spring 192 is stretched and offsets the inertia and impact force of the power output from the hydraulic cylinder 3, so that the pressing plate 20 drives the buffer plate 21 and the workpiece 22 to abut against each other, and at the same time provides fixing and abutting pressure, which helps to improve the stability of the device. The stretched reset column 193 will drive the reset column 193 to shrink into the interior of the reset cylinder 191 after the movable plate 5 is reset upward, and then drive the pressing plate 20 to reset horizontally.

[0024] The opposite surfaces of the two groups of workpieces 22 abut against each other, and the two groups of buffer plates 21 abut against the two groups of workpieces 22 respectively; like Figure 3 As shown, the device utilizes the need to generate appropriate abutment force between the opposite surfaces of two groups of workpieces 22. The F flats generated by the left and right groups of pressing plates 20 and buffer plates 21 on the workpieces 22 are equal in size and opposite in direction, and just abut against each other, so that the workpieces 22 do not shift when fixed. The device utilizes the symmetrical pressure F inclined on the workpiece 22 generated by the mutually symmetrical connecting plates 17 and 18 on the left and right sides, so that the device has a self-locking function. When the workpiece 22 is pressed and fixed, it cannot shift in the horizontal direction. The moving plate 5 in the vertical direction provides the connecting plates 17, 18, the pressing plate 20 and the buffer plate 21 to firmly press the workpiece 22 on the base 1, making the device more practical.

[0025] Among them, the vertical part of the connecting plate 1 17 close to the inner side of the moving plate 5, the surfaces of the connecting plate 1 17 and the connecting plate 2 18 are always parallel to the axis of the reset mechanism 19; The connecting plate 17 and the connecting plate 2 18 are parallel to each other, and are movably connected to the pressing plate 20 via the connecting seat 15 and the movable column 16 , so that the pressing plate 20 always maintains a horizontal state, so that the buffer plate 21 can better fit the workpiece 22 .

[0026] The connecting plate 17 and the vertical part of the movable plate 5 form an angle of 30°, and when the side surface of the pressing plate 20 abuts against the inner wall of the movable plate 5, the angle between the connecting plate 17 and the vertical part of the movable plate 5 is greater than 0; The angle between the connecting plate 17 and the vertical part of the movable plate 5 determines the size of F horizontal and F vertical, and F vertical will decrease as the angle increases, while F horizontal will increase. As long as F horizontal is adjusted to a suitable size, the movement of the movable plate 5 can be stopped and maintained at a predetermined position.

[0027] Working principle: First, two sets of workpieces 22 are placed symmetrically on the upper surface of the base 1, and their opposite surfaces are in abutment with each other; Then, the hydraulic cylinder 3 is started, and the moving frame 4 and the moving plate 5 are driven to move downward as a whole. At this time, the guide column 7 moves upward relative to the guide groove 6, and is adapted to be inserted into the deep part of the guide groove 6 to provide a guiding effect for the moving plate 5. Figure 2 As shown, Figure 2 The figure shows that the movable plate 5 moves to a fixed position. In the initial state, the side of the pressing plate 20 abuts against the inner side of the movable plate 5. The movable plate 5 drives the pressing plate 20 and the buffer plate 21 downward, and makes the bottom of the buffer plate 21 abut against the workpiece 22. At this time, the buffer plate 21 begins to exert vertical pressure on the workpiece 22 downward. At the same time, as the movable plate 5 continues to move downward, the bottoms of the connecting plates 17 and 18 begin to rotate synchronously toward the axis of the welding gun 14. At this time, the pressing plate 20 applies a fixed pressure to the workpiece 22 downward through the buffer plate 21. At the same time, the connecting plate 1 17. The connecting plate 18 moves horizontally toward the axis of the welding gun 14, and the friction between the buffer plate 21 and the workpiece 22 pushes the workpiece 22 toward the axis of the welding gun 14. At this time, the reset mechanism 19 is tilted by the horizontal movement of the pressing plate 20, and the reset column 193 begins to extend outward along the axis of the reset cylinder 191, stretching the reset spring 192. When the two groups of pressing plates 20 move toward each other to the minimum distance, the abutment pressure and vertical fixing pressure between the two groups of workpieces 22 reach a suitable state, completing the fixation of the pressing plate 20. Finally, start the telescopic rod 13 and drive the welding gun 14 down to the welding position, start the ball screw 10 and drive the slider 12, the telescopic rod 13 and the welding gun 14 to move horizontally forward and backward along the axis of the guide rod 11, turn on the welding gun 14, and weld the weld formed by the abutment between the two groups of workpieces 22.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic welding machine for welding seams, comprising a base (1), two groups of workpieces (22) are placed in the middle of the top surface of the base (1), top frames (2) are installed on both sides of the top of the base (1), a hydraulic cylinder (3) is installed on the top of the top frame (2), a moving frame (4) is installed at the telescopic end of the hydraulic cylinder (3), a fixing frame (8) is fixedly installed on the inner side of the top frame (2), a mounting frame (9) is installed on the inner side of the fixing frame (8), and a welding gun (14) is installed inside the mounting frame (9), characterized in that: Two groups of moving plates (5) are symmetrically mounted on the left and right sides of the bottom of the moving frame (4); two groups of connecting seats (15) equidistantly distributed on the left and right sides are fixedly mounted on the top of the inner side of the moving plate (5); movable columns (16) are rotatably mounted inside the connecting seats (15); connecting plates 1 (17) and 2 (18) are movably sleeved on the outer surfaces of the two groups of movable columns (16) in sequence; the connecting plates 1 (17) and 2 (18) are parallel to each other; the bottom of the connecting plate 2 (18) is movably connected to a pressing plate (20) via another group of connecting seats (15) and the movable columns (16); a reset mechanism (19) is movably hinged between the moving plate (5) and the pressing plate (20); and a buffer plate (21) is fixedly connected to the bottom of the pressing plate (20).

2. The automatic welding machine according to claim 1, characterized in that: The mounting frame (9) is located between the top of the inner wall of the moving frame (4) and the top of the moving plate (5); a ball screw (10) is rotatably mounted inside the mounting frame (9) and is fixedly connected to guide rods (11) located on both sides of the ball screw (10); a slider (12) is threadedly mounted on the outer surface of the ball screw (10); the slider (12) is slidably mounted on the outer surface of the guide rod (11); a telescopic rod (13) is fixedly mounted on the bottom of the slider (12); and the telescopic end of the telescopic rod (13) is fixedly connected to a welding gun (14).

3. The automatic welding machine according to claim 2, characterized in that: A plurality of guide columns (7) are fixedly mounted on both left and right sides of the top of the base (1), a plurality of guide grooves (6) are provided at the bottom of the movable plate (5), and the guide columns (7) are adapted to be inserted into the guide grooves (6).

4. The automatic welding machine according to claim 3, characterized in that: The cross-sectional shape of the movable plate (5) is an "L" shape, and the vertical portion of the inner side surface of the movable plate (5) is in sliding contact with the side surface of the base (1).

5. The automatic welding machine according to claim 4, characterized in that: The reset mechanism (19) comprises a reset cylinder (191), the reset cylinder (191) being internally movably sleeved with a reset spring (192) and a reset column (193), the two ends of the reset spring (192) being elastically connected to the top of the inner wall of the reset cylinder (191) and the inner end of the reset column (193), respectively, the outer end of the reset column (193) being hinged to the upper surface of the pressing plate (20), and the top end of the reset cylinder (191) being hinged to the top of the inner wall of the moving plate (5).

6. The automatic welding machine according to claim 5, characterized in that: The opposing surfaces of the two groups of workpieces (22) abut against each other, and the two groups of buffer plates (21) abut against the two groups of workpieces (22) respectively.

7. The automatic welding machine according to claim 6, characterized in that: The connecting plate 1 (17) is close to the vertical portion of the inner side of the movable plate (5), and the surfaces of the connecting plate 1 (17) and the connecting plate 2 (18) are always parallel to the axis of the reset mechanism (19).

8. The automatic welding machine according to claim 7, characterized in that: The connecting plate 1 (17) and the vertical portion of the movable plate (5) form an angle of 30°, and when the side surface of the pressing plate (20) abuts against the inner wall of the movable plate (5), the angle between the connecting plate 1 (17) and the vertical portion of the movable plate (5) is greater than 0.

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