CN115816159A - A horizontal double-head processing equipment - Google Patents

Abstract

The present invention relates to the technical field of mechanical processing clamping equipment, in particular to a horizontal double-head processing equipment; including a frame, a mounting seat, a workpiece carrier, a first processing device and a second processing device, the mounting seat, Both the first processing device and the second processing device are located in the frame; the first processing device includes a first angle adjustment member, a rotating seat, an X-direction driving member, an X-direction slide plate, a Y-direction driving member, a Y-direction slide seat, a Z-direction The driving part, the Z-direction slide plate, the second angle adjustment part and the main shaft assembly; the first angle adjustment part drives the rotating seat to rotate in the XY plane; the second angle adjustment part is arranged on the Z-direction slide plate and drives the main shaft assembly to rotate in the YZ plane; The main shaft assembly is used to install external tools; to achieve the purpose of quickly adjusting the different positions and different inclination angles of the tool, and cooperate with the inclined or curved processing surface to improve production efficiency and processing quality.

Description

A horizontal double-head processing equipment

technical field

The invention relates to the technical field of machining clamping equipment, in particular to a horizontal double-head processing equipment.

Background technique

As shown in Figure 4-1, the workpiece to be processed is irregular. According to the design requirements, it is necessary to process the left and right ends of the workpiece and the inner side of the length direction respectively. The left and right ends are inclined or curved. The production design requires It needs to be processed on the surface of the inclined or curved surface. When the volume of the workpiece is small, the processing method of the machining center can meet the production and processing requirements. When the volume of the workpiece is large, the machining center cannot accommodate the workpiece, so the traditional processing method is required. However, when the surface to be processed is inclined or curved, it is difficult to meet the processing requirements in terms of angle by using traditional processing equipment. The shortcomings of low precision, low production efficiency, and uncontrollable production quality do not meet the requirements of high-precision production and need to be improved.

Contents of the invention

In order to overcome the shortcomings of low production efficiency and uncontrollable quality in the prior art, the purpose of the present invention is to provide a horizontal double-head processing equipment. By positioning the workpiece once and adjusting the angle of the tool in the equipment to match the processing surface, It meets the production requirements for processing on curved or inclined surfaces, and achieves the purpose of improving production efficiency and processing quality.

To achieve the above object, the technical solution of the present invention is:

A horizontal double-head processing equipment, including a frame, and also includes a mounting base, a workpiece carrier, a first processing device and a second processing device, and the workpiece carrier, the first processing device and the second processing device are all located on The mounting seat, the mounting seat, the workpiece carrier, the first processing device and the second processing device are all located in the frame;

The workpiece carrier includes a bottom plate, several pillars and several pressure pieces, the several pillars are all arranged on the bottom plate and are located on the same side of the bottom plate, and one pillar is arranged on the free end of one pillar and is used to fix the external workpiece;

The first processing device includes a first angle adjustment member, a rotating seat, an X-direction driving member, an X-direction slide plate, a Y-direction drive member, a Y-direction slide seat, a Z-direction drive member, a Z-direction slide plate, a second angle adjustment member and spindle assembly;

The first angle adjustment member is arranged on the mounting seat, the rotating seat is rotatably connected to the mounting seat, and the first angle adjusting member drives the rotating seat to rotate in the XY plane;

The X-direction driving part is arranged on the rotating seat and drives the X-direction sliding plate to move along the length direction of the rotating seat. The Y-direction driving part is arranged on the X-direction sliding plate and drives the Y-direction sliding seat to move. The Z-direction driving part is arranged on The Y-direction slide seat drives the Z-direction slide plate to move up and down, and the second angle adjustment member is arranged on the Z-direction slide plate and drives the spindle assembly to rotate in the YZ plane;

The spindle assembly is used for installing external tools.

Further, the first angle adjustment member includes a first driving member and a first connecting member, the first driving member is arranged on the mounting base, the first connecting member is fixedly connected to the rotating base, and the first The driving part drives the first connecting part to rotate.

Further, the first driving member includes a first handwheel and a first worm connected to the first handwheel, and the first connecting member is provided with a first arc and a first tooth on the first arc , the first gear meshes with the first worm, and the first hand wheel drives the first worm to rotate and drives the first connecting member to rotate.

Further, the second angle adjustment member includes a second driving member and a second connecting member, the second driving member is arranged on the Z-direction slide plate, the second connecting member is fixed on the main shaft assembly, and the second driving member The part drives the second connecting part to rotate.

Further, the second driving member includes a second handwheel and a second worm connected to the second handwheel, and the second connecting member is provided with a second arc and a second tooth on the second arc , the second gear meshes with the second worm, and the second hand wheel drives the second worm to rotate and drives the second connecting piece to rotate.

Further, the first processing device further includes a tool box, and the tool box is arranged on the Y-direction slide seat.

Beneficial effects of the present invention: by setting the first angle adjustment member, the rotating seat, the X-direction driving member, the X-direction slide plate, the Y-direction drive member, the Y-direction slide seat, the Z-direction drive member, the Z-direction slide plate, and the second angle adjustment member And the spindle assembly, to achieve the purpose of quickly adjusting the different positions and different inclination angles of the tool, and cooperate with the inclined or curved processing surface, thereby improving production efficiency and processing quality.

Description of drawings

Fig. 1-1 is the three-dimensional structure schematic diagram of the present invention;

1-2 is a schematic diagram of the internal three-dimensional structure of the present invention;

1-3 are schematic diagrams of the state structure of the workpiece carrier carrying the workpiece to be processed according to the present invention;

1-4 are schematic diagrams of the structure of the disassembled state of the workpiece carrier of the present invention;

1-5 are schematic diagrams of the first viewing angle structure of the mounting seat of the present invention;

Fig. 1-6 is the three-dimensional cross-sectional structural schematic diagram of the mounting seat of the present invention;

1-7 are schematic diagrams of the structure of the second viewing angle of the mounting seat of the present invention;

Figure 2-1 is a schematic structural view of the first processing device of the present invention installed on the mounting base;

Fig. 2-2 is the schematic diagram of the three-dimensional structure of the first processing device of the present invention;

Fig. 2-3 is the disassembly structure schematic diagram of the first processing device of the present invention;

2-4 are schematic diagrams of the assembly state of the first angle adjustment member and the rotating seat of the present invention;

Figures 2-5 are disassembled views of the first angle adjustment member and the rotating seat of the present invention;

2-6 are schematic diagrams of the assembly structure of the second angle adjustment member and the main shaft assembly of the present invention;

2-7 are schematic diagrams illustrating the structure of the working principle of the second angle adjustment member of the present invention;

Fig. 2-8 is a schematic diagram of the second angle adjustment member of the present invention disassembled at the first viewing angle;

Fig. 2-9 is a schematic diagram of the disassembled structure of the second angle adjustment member of the present invention at the second viewing angle;

Figure 2-10 is a disassembled structure diagram of the second connecting piece and the turntable of the present invention;

Figure 3-1 is a schematic diagram of the three-dimensional structure of the tool box of the present invention at the first viewing angle;

Fig. 3-2 is a schematic diagram of the three-dimensional structure of the second viewing angle of the tool box of the present invention;

Figure 3-3 is a schematic diagram of disassembly of the tool box of the present invention;

Fig. 3-4 is the schematic diagram of toolholder of the present invention

Figure 4-1 is a schematic diagram of the structure of the workpiece to be processed.

Reference signs include:

100—mounting seat 200—workpiece carrier 201—bottom plate

202—column 203—pressure piece 2301—accommodating tank

2302—swing rod 300—the first processing device 31—the first angle adjustment member

311—the first driving member 3111—the first hand wheel 3112—the first worm

312—the first connecting piece 3121—the first arc portion 3122—the first tooth portion

32—Swivel seat 331—X-direction driving member 332—X-direction slide plate

341—Y direction driver 342—Y direction slide 351—Z direction driver

352—Z direction slide plate 36—Second angle adjustment member 361—Second driving member

3611—second handwheel 3612—second worm 362—second connecting piece

3621—second arc 326a—left 326b—middle

326c—right side 3622—second worm 363—adapter

363a—convex portion 363b—first groove body 364—turntable

3641—spindle housing 3642—disc body 364a—groove

364b—second groove 364c—notch 37—spindle assembly

38—tool box 381—casing body 382—tool tray

383—rotary drive 384—transverse drive 385—longitudinal drive

386—connecting plate 387—knife holder 400—second processing device

500—the workpiece to be processed.

Detailed ways

In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the embodiments and accompanying drawings, and the contents mentioned in the implementation modes are not intended to limit the present invention.

Please refer to Fig. 1-1 to Fig. 3-4, a kind of horizontal automatic processing equipment of the present invention includes a frame, and also includes a mounting base 100, a workpiece carrier 200, a first processing device 300 and a second processing device 400 , the workpiece carrier 200, the first processing device 300 and the second processing device 400 are all located on the mounting base 100, and the mounting base 100, the workpiece carrier 200, the first processing device 300 and the second processing device 400 are all located at inside the rack;

The number of the first processing device 300 is two;

The workpiece carrier 200 includes a bottom plate 201, several pillars 202 and several pressure pieces 203, and several pillars 202 are all arranged on the bottom plate 201 and are positioned on the same side of the bottom plate 201, and one pillar 202 is arranged on one pillar. The free end of part 202 and is used for fixing external workpiece 500;

The first processing device 300 includes a first angle adjustment member 31, a rotating seat 32, an X-direction drive member 331, an X-direction slide plate 332, a Y-direction drive member 341, a Y-direction slide seat 342, a Z-direction drive member 351, and a Z-direction drive member 351. Sliding plate 352, second angle adjustment member 36 and main shaft assembly 37;

The first angle adjustment member 31 is arranged on the mounting base 100, the rotating base 32 is rotatably connected to the mounting base 100, and the first angle adjusting member 31 drives the rotating base 32 to rotate in the XY plane;

The X-direction driving member 331 is arranged on the rotating seat 32 and drives the X-direction sliding plate 332 to move along the length direction of the rotating seat 32, and the Y-direction driving member 341 is arranged on the X-direction sliding plate 332 and drives the Y-direction sliding seat 342 to move. The Z-direction driver 351 is arranged on the Y-direction slide 342 and drives the Z-direction slide 352 to move up and down, and the second angle adjustment member 36 is arranged on the Z-direction slide 352 and drives the spindle assembly 37 to rotate in the YZ plane;

The spindle assembly 37 is used for installing external tools.

Specifically, in this embodiment, the mounting seat 100 includes a lower bottom plate, an upper top plate and several middle connecting plates, wherein the lower bottom plate is hollowed out, the middle connecting plate is hollowed out, and the lower bottom plate and the upper top plate are connected by several middle connecting plates , the distance between the lower bottom plate and the upper top plate is set, and the setting of the hollowed-out lower bottom plate and the hollow-shaped middle connecting plate makes the overall weight reduction of the mounting seat 100, and at the same time, it has the effect of shock absorption and noise reduction in the working process, making the production environment environmentally friendly. Requirements, the workpiece carrier 200 is located in the middle of the mounting base 100, the workpiece carrier 200 includes a bottom plate 201, eight cylinders 202, and eight pressing parts 203, the specifications of the eight cylinders 202 are the same, of which four cylinders 202 As a group, one pressing piece 203 is located at the top of a cylinder 202, four pressing pieces 203 are provided with accommodating grooves 2031, four pressing pieces 203 are provided with swing rods 2032, one pressing piece 203 with swing rods 2032 and A pressing piece 203 with accommodating groove 2031 is arranged adjacently, and the external workpiece 500 to be processed is placed on four pressing pieces 203 with accommodating groove 2031 for pre-fixing, and the swing rods 2032 of the other four pressing pieces 203 are rotated to be processed. 500 for pressing to complete the fixation of the workpiece 500 to be processed. The number of the first processing device 300 is two, and the two first processing devices 300 are installed on the mounting base 100 and are located on opposite sides of the workpiece carrier 200. A second processing device 400 is installed between the first processing devices 300. The second processing device 400 is equipped with a marking tool, adjusts the position of the marking tool, and marks the surface of the workpiece 500 to be processed. The two first processing devices 300 and A second processing device 400 roughly constitutes a triangle shape. The tool is installed on the spindle assembly 37 of the first processing device 300. Synchronously, the marking tool is installed on the clamping part of the second processing device 400. First, the X-direction drive member 331 Drive the X-direction slide plate 332 to the preset position, the Y-direction drive member 341 drives the Y-direction slide seat 342 to the preset position, and the Z-direction drive member 351 drives the Z-direction slide plate 352 to the preset position. Preliminary adjustment of the X, Y, and Z spatial positions, and then the first angle adjustment member 31 drives the rotating base 32 to rotate to a preset angle on the XY plane. To the slide plate 352, the second angle adjustment member 36 and the main shaft assembly 37 synchronously rotate the same angle, that is, the angle of the central axis of the main shaft assembly 37 in the X Y plane reaches the preset requirement, and then the second angle adjustment member 36 drives the main shaft assembly 37 in YZ Rotate the preset angle of the plane to complete the adjustment of the angle of the tool installed on the spindle assembly 37 on the YZ plane, and finally fine-tune the position of the tool in X, Y, and Z spaces, so that the tool clamped by the spindle assembly 37 is aligned with the workpiece 500 The included angle formed by the machined surface meets the machining requirements.

By setting the first angle adjustment member 31, the rotating seat 32, the X-direction driving member 331, the X-direction slide plate 332, the Y-direction drive member 341, the Y-direction slide seat 342, the Z-direction drive member 351, the Z-direction slide plate 352, the second angle The adjustment member 36 and the main shaft assembly 37 realize the purpose of quickly adjusting the different positions and different inclination angles of the tool, and cooperate with the inclined or curved processing surface to improve production efficiency and processing quality.

The first angle adjustment member 31 includes a first driving member 311 and a first connecting member 312, the first driving member 311 is arranged on the mounting base 100, the first connecting member 312 is fixedly connected to the rotating base 32, The first driving member 311 drives the first connecting member 312 to rotate, and the first connecting member 312 is T-shaped. The purpose of rotating the first connecting member 312 is driven by the first driving member 311 to achieve the purpose of adjusting the rotating seat 32 to rotate at a certain angle. .

The first driving member 311 includes a first handwheel 3111 and a first worm 3112 connected to the first handwheel 3111, and the first connecting member 312 is provided with a first arc 3121 and a first arc 3121. The first tooth part 3122, the first tooth part 3122 is provided with air holes, the air holes are arranged along the thickness direction of the teeth, which has the effect of rapid heat dissipation, and reduces the contact area, reducing the friction between the first worm 3112 and the first tooth part 3122 , the first tooth portion 3122 meshes with the first worm 3112, the first hand wheel 3111 drives the first worm 3112 to rotate and drives the first connecting piece 312 to rotate, the setting of the first arc portion 3121 makes the first The tooth part 3122 is arranged in an arc shape as a whole. Under the rotation of the first worm screw 3112, the teeth of the first worm screw 3112 mesh with the first tooth part 3122, thereby driving the first connecting member 312 and the rotating seat 32 to rotate, that is, to realize the rotation of the main shaft assembly 37. The purpose of rotating the XY plane to a preset angle.

The second angle adjustment member 36 includes a second driving member 361 and a second connecting member 362, the second driving member 361 is arranged on the Z-direction slide plate 352, and the second connecting member 362 is fixed on the main shaft assembly 37, so The second driving member 361 drives the second connecting member 362 to rotate.

The second driving member 361 includes a second handwheel 3611 and a second worm 3612 connected with the second handwheel 3611. The second connecting member 362 is provided with a second arc portion 3621 and a second arc portion 3621. The second tooth portion 3622, the second tooth portion 3622 meshes with the second worm 3612, the second hand wheel 3611 drives the second worm 3612 to rotate and drives the second connecting member 362 to rotate, the second arc portion 3621 It is set so that the second tooth part 3622 is set in an arc shape as a whole. Under the rotation of the second worm 3612, the teeth of the second worm 3612 mesh with the second tooth part 3622, thereby driving the second connecting piece 362 and the main shaft assembly 37 in the YZ plane The purpose of turning the preset angle.

The second angle adjustment member 36 also includes an adapter 363 and a turntable 364, the adapter 363 is fixed on the Z-direction slide 352, the turntable 364 is rotatably connected to the adapter 363, the second link 362 and The turntable 364 is connected, and the spindle assembly 37 is connected to the turntable 364. Preferably, the adapter 363 is provided with a convex portion 363a and a first groove 363b. The body 363b is recessed on the surface of the convex part 363a. The setting of the first groove body 363b has the effect of reducing weight and energy consumption. The turntable 364 is provided with a groove 364a and a plurality of second groove bodies 364b. The grooves 364b are arranged at intervals, and several second grooves 364b are arranged in an annular array with the central axis of the groove 364a. There are several pits in the groove 364a, and the pits are recessed on the bottom surface of the groove 364a. The first second groove body 364b is also provided with a cotton-absorbing piece, which covers the pit. In actual use, lubricating oil is dripped into the pit, and the lubricating oil seeps out through the cotton-absorbing piece, so that the convex portion 363a rotates relative to the groove 364a. It is more lubricated, reduces friction, and reduces noise. The cotton-absorbing sheet is a consumable, easy to replace. The cotton-absorbing sheet is applied in the pit, and the lubricating oil is gathered in the pit, saving the amount of lubricating oil and improving the lubrication of the lubricating oil. The cycle further improves the service life of the equipment and reduces the production cost. The arrangement of the second groove body 364b and the first groove body 363b reduces the contact area between the convex portion 363a and the groove 364a and reduces friction.

Preferably, the turntable 364 also includes a spindle housing 3641 and a disc body 3642, the spindle housing 3641 is used to accommodate the motor spindle, the output end of the motor spindle holds the tool, the groove 364a is arranged on the disc body 3642, the spindle housing 3641 and the The disc body 3642 is integrally formed to ensure the accuracy of the verticality of the central axis of the spindle housing 3641 and the central axis of the groove 364a, which facilitates the installation of the motor and further ensures the accuracy of the rotation angle of the tool.

Preferably, a notch 364c is processed on the side surface of the disc body 3642, the notch 364c is in a wide upper part and narrower lower part, the second connector 362 is embedded in the notch 364c and protrudes from the notch 364c, and the external screw connector connects the second connector 362 is fixed on the disc body 3642, the side surface of the second connecting piece 362 protrudes from the side surface of the disc body 3642, the second arc portion 3621 is set away from the disc body 3642, and the second tooth portion 3622 is arranged on the second arc portion 3621. Under the rotation of the second worm 3612, the purpose of synchronous rotation of the second connecting piece 362 and the turntable 364 is realized. The split structure of the second connecting piece 362 and the turntable 364 is convenient for processing and meets the local finishing production requirements of different workpieces, thereby improving Production efficiency, the second connecting part 362 is provided with a heat dissipation channel, which reduces the heat generated during the second driving part 361 driving the second connecting part 362 to rotate, and improves the service life of the equipment. The second arc part 3621 includes the left part connected in sequence 326a, the middle part 326b and the right part 326c, the center distance from the left part 326a to the disc body 3642 is greater than the center distance from the middle part 326b to the disc body 3642, the center distance from the right part 326c to the disc body 3642 is greater than the center distance from the middle part 326b to the disc body The center distance of 3642, the second tooth part 3622 is set on the right part 326c, and the setting of the middle part 326b makes the meshing between the second worm 3612 and the second tooth part 3622 smoother, the rotation resistance is small, and the energy consumption is reduced. The second tooth part 3622 Each tooth is provided with several through holes, the diameter of which is less than 0.5 microns, some of which hold lubricating oil for lubricating effect, and some of the through holes are vacant for ventilation and cooling, reducing frictional resistance At the same time, improve the service life of the equipment.

The first processing device 300 also includes a tool box 38, which is arranged on the Y-direction slide 342. The tool box 38 is used to store tools of different specifications, so as to facilitate the replacement of tools during the production process.

Preferably, the tool box 38 includes a box body 381, a tool carrier plate 382, a rotary drive 383, a transverse drive 384, a longitudinal drive 385 and a connecting plate 386, and the transverse drive 384 is arranged on the Y-direction slide 342 and drives the connecting plate 386 to move laterally, the longitudinal drive 385 is arranged on the connecting plate 386 and drives the box body 381 to move longitudinally, and the rotating drive 383 is arranged on the box 381 and drives the rotation of the tool carrier 382 to realize the movement of the tool carrier 382, which will require The tool is transferred to the discharge port of the box body 381, which is convenient for the staff to install the required tool on the main shaft assembly 37. The tool carrier disc 382 also includes a plurality of tool holders 387. The tool carrier disc 382 is provided with several tool clamps. The cutter jaw clamps a cutter holder 387 , and the cutter holder 387 is fixed on the cutter carrier plate 382 .

Preferably, the tool holder 387 includes a clamping mouth, and the clamping mouth is Ω-shaped, so that the opening end of the clamping mouth has elasticity, which is convenient for picking and placing the tool. The inner surface of the mouth and the setting of the ribs can increase the friction between the clamping mouth and the tool, and improve the clamping force.

The above content is only a preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. limits.

Claims (6)

1. The utility model provides a horizontal double-end processing equipment, includes the frame, its characterized in that: the machining device is characterized by further comprising a mounting seat (100), a workpiece carrier (200), a first machining device (300) and a second machining device (400), wherein the workpiece carrier (200), the first machining device (300) and the second machining device (400) are all arranged on the mounting seat (100), and the mounting seat (100), the workpiece carrier (200), the first machining device (300) and the second machining device (400) are all located in the rack;

the workpiece carrier (200) comprises a bottom plate (201), a plurality of columns (202) and a plurality of pressing pieces (203), wherein the columns (202) are arranged on the bottom plate (201) and positioned on the same side of the bottom plate (201), and one column (202) is arranged at the free end of one column (202) and used for fixing an external workpiece (500);

the first machining device (300) comprises a first angle adjusting piece (31), a rotating seat (32), an X-direction driving piece (331), an X-direction sliding plate (332), a Y-direction driving piece (341), a Y-direction sliding seat (342), a Z-direction driving piece (351), a Z-direction sliding plate (352), a second angle adjusting piece (36) and a spindle assembly (37);

the first angle adjusting piece (31) is arranged on the mounting seat (100), the rotating seat (32) is rotatably connected to the mounting seat (100), and the first angle adjusting piece (31) drives the rotating seat (32) to rotate on an XY plane;

the X-direction driving piece (331) is arranged on the rotating base (32) and drives the X-direction sliding plate (332) to move along the length direction of the rotating base (32), the Y-direction driving piece (341) is arranged on the X-direction sliding plate (332) and drives the Y-direction sliding base (342) to move, the Z-direction driving piece (351) is arranged on the Y-direction sliding base (342) and drives the Z-direction sliding plate (352) to move up and down, and the second angle adjusting piece (36) is arranged on the Z-direction sliding plate (352) and drives the spindle assembly (37) to rotate on a YZ plane;

the spindle assembly (37) is used for mounting an external cutter.

2. The horizontal double-headed processing apparatus according to claim 1, characterized in that: the first angle adjusting piece (31) comprises a first driving piece (311) and a first connecting piece (312), the first driving piece (311) is arranged on the mounting seat (100), the first connecting piece (312) is fixedly connected with the rotating seat (32), and the first driving piece (311) drives the first connecting piece (312) to rotate.

3. The horizontal double-headed processing apparatus according to claim 2, characterized in that: first driving piece (311) include first hand wheel (3111) and first worm (3112) be connected with first hand wheel (3111), first connecting piece (312) are equipped with first arc portion (3121) and locate first tooth portion (3122) of first arc portion (3121), first tooth portion (3122) with first worm (3112) meshing, first hand wheel (3111) drive first worm (3112) and rotate and drive first connecting piece (312) and rotate.

4. The horizontal double-headed processing apparatus according to claim 1, characterized in that: the second angle adjusting part (36) comprises a second driving part (361) and a second connecting part (362), the second driving part (361) is arranged on the Z-direction sliding plate (352), the second connecting part (362) is fixedly arranged on the spindle assembly (37), and the second driving part (361) drives the second connecting part (362) to rotate.

5. The horizontal double-headed processing apparatus according to claim 4, characterized in that: the second driving part (361) comprises a second hand wheel (3611) and a second worm (3612) connected with the second hand wheel (3611), the second connecting part (362) is provided with a second arc part (3621) and a second tooth part (3622) arranged on the second arc part (3621), the second tooth part (3622) is meshed with the second worm (3612), and the second hand wheel (3611) drives the second worm (3612) to rotate and drives the second connecting part (362) to rotate.

6. The horizontal double-headed processing apparatus according to claim 1, characterized in that: the first machining device (300) further comprises a cutter box (38), and the cutter box (38) is arranged on the Y-direction sliding seat (342).

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