CN108466338B

CN108466338B - Wood board drilling machine

Info

Publication number: CN108466338B
Application number: CN201810201978.2A
Authority: CN
Inventors: 张亮; 吴传文; 杨贵忠; 杨贵国; 刘科
Original assignee: Chengdu Deb Industrial Co ltd
Current assignee: Chengdu Deb Industrial Co ltd
Priority date: 2018-03-12
Filing date: 2018-03-12
Publication date: 2020-05-19
Anticipated expiration: 2038-03-12
Also published as: CN108466338A

Abstract

The invention relates to a wood board drilling machine which comprises a workbench, wherein a first sliding rail is arranged on the workbench and positioned at the bottom of the workbench, a moving plate is arranged on the first sliding rail in a sliding manner, a cutter for drilling a wood board is arranged on the moving plate, a processing groove for the cutter to pass through the workbench is formed in the workbench, the length direction of the first sliding rail is the same as that of the processing groove, and an adjusting mechanism for adjusting the position of the wood board to be drilled is arranged on the workbench; the moving plate is provided with a first air cylinder which is used for driving the cutter to move in the processing groove along the vertical direction, a piston rod end of the first air cylinder is provided with a first rotating motor, and the cutter is arranged at the output shaft end of the first rotating motor and is opposite to the processing groove; the moving plate is provided with a driving mechanism for driving the moving plate to move along the length direction of the first slide rail. The arrangement ensures that the process hole does not need to be processed manually, and the advantage of efficient drilling is achieved.

Description

Wood board drilling machine

Technical Field

The invention relates to the field of wood processing equipment, in particular to a wood board drilling machine.

Background

The drawer is a box for placing articles in furniture such as tables, cabinets and the like, has a bottom and no cover, and can be drawn out and pushed in. Most of the existing drawers are made of wood and are used for holding articles.

As shown in fig. 7, the wood board 8, the fabrication hole 82 formed in the wood board 8, and the plug 81 formed in the wood board 8 are included, and a groove 821 is further drilled in the fabrication hole 82. When the drawer is installed, the plurality of wood boards 8 are fixed together to form the drawer only through the plug connectors 81 on the wood boards 8 and the specific process holes 82, so that the drawer can be disassembled, and the drawer can be disassembled more conveniently.

The fabrication hole 82 of the drawer is drilled on the wood board 8, and then the slot 821 is continuously slotted in the fabrication hole 82 along the direction perpendicular to the axial direction of the fabrication hole 82, the width of the slot 821 is smaller than the diameter of the fabrication hole 82, after the slot 821 of the fabrication hole 82 is drilled, the plug 81 matched with the fabrication hole 82 and the slot 821 is installed on the other wood board 8, the head of the plug 81 is the same as the diameter of the fabrication hole 82, and the pipe section diameter of the plug 81 is the same as the width of the slot 821 opened beside the fabrication hole 82. During installation, the plug 81 is inserted into the hole 82, and then the plug 81 is slid along the groove 821 so that the plug 81 is located in the groove 821. Because the head of the plug 81 is larger than the width of the slot 821, the plug 81 can be clamped in the slot 821, thereby achieving the clamping effect.

The prior art for processing the technical hole drills through manual work, and due to the characteristics of the technical hole, the time spent by the manual work during drilling is long, and the working efficiency is not high.

Disclosure of Invention

The invention aims to provide a wood board drilling machine which has the advantage of efficient drilling.

The above object of the present invention is achieved by the following technical solutions:

a wood board drilling machine comprises a workbench, wherein a first sliding rail is arranged at the bottom of the workbench, a moving plate is arranged on the first sliding rail in a sliding manner, a cutter for drilling a wood board is arranged on the moving plate, a machining groove for allowing the cutter to pass through the workbench is formed in the workbench, the length direction of the sliding rail is the same as that of the machining groove, and an adjusting mechanism for adjusting the position of the wood board to be drilled is arranged on the workbench;

the moving plate is provided with a first air cylinder which is used for driving a cutter to move in the machining groove along the vertical direction, a piston rod end of the first air cylinder is provided with a first rotating motor, and the cutter is arranged at the output shaft end of the first rotating motor and is opposite to the machining groove;

and the moving plate is provided with a driving mechanism for driving the moving plate to move along the length direction of the first slide rail.

The technical scheme is implemented, firstly, an adjusting mechanism on a workbench is adjusted, the position of the wood board to be drilled is opposite to a processing groove, then, a first air cylinder and a first rotating motor are started, and a cutter penetrates through the processing groove to drill the wood board; then, the driving mechanism is started to enable the moving plate to slide, and the wood plate is continuously transversely processed after drilling, so that a process hole does not need to be processed manually, and the advantage of efficient drilling is achieved.

Furthermore, a dovetail block is arranged at the end part, opposite to the first slide rail, of the moving plate, and a dovetail groove for the dovetail block to slide is formed in the length direction of the first slide rail, opposite to the end part of the moving plate.

By implementing the technical scheme, the dovetail blocks can slide in the dovetail grooves in the moving process of the moving plate, so that the moving plate can move more smoothly.

Further, the driving mechanism comprises a second rotating motor arranged on the moving plate, an output shaft of the second rotating motor penetrates through the moving plate and extends towards the side opposite to the first sliding rail, a gear is connected to the output shaft of the second rotating motor, and a rack meshed with the gear is arranged on the inner side wall of the sliding rail along the length direction of the first sliding rail.

Implement above-mentioned technical scheme, start the second and rotate the motor, the second rotates the motor and drives the gear rotation, because gear and rack toothing, consequently the gear can drive the movable plate and remove on first slide rail under rotating, and the removal of more audio-visual realization movable plate, and it is more convenient to operate.

Further, adjustment mechanism includes the second slide rail that sets up along the length direction of perpendicular to processing groove on the workstation and sets up on the second slide rail and along the gliding slider of the length direction of second slide rail, be provided with on the slider and be used for with the baffle of placing the plank butt on the workstation, be provided with on the slider and be used for fixing the mounting on the second slide rail with the slider, the mounting is including wearing to establish the tight bolt that supports on the slider, be provided with the scale along the length direction of second slide rail on the second slide rail.

Implement above-mentioned technical scheme, when adjusting the waiting drilling position on the plank, remove the slider that is in the second slide rail, let baffle on the slider promote the plank and remove above the workstation, observe the plank and just to the numerical value of scale, after reaching predetermined position, fix the slider in the second slide rail with supporting tight bolt for it is more convenient to adjust the position of plank on the workstation.

Furthermore, a receiving box is arranged on an output shaft of the first rotating motor in a penetrating mode, the receiving box is arranged right opposite to an opening of the processing groove end, and a plurality of supporting rods used for supporting the receiving box are arranged on the end face, right opposite to the receiving box, of the first rotating motor.

By implementing the technical scheme, when the cutter drills the wood board, most of the generated wood chips fall into the receiving box from the processing groove through the opening above the receiving box, so that the aim of collecting the waste chips is fulfilled; because the accepting box is worn to establish on the output shaft of first rotation motor, consequently the rotation of the output shaft of first rotation motor can not influence the accepting box, and the bracing piece that sets up can fix the accepting box in the top of first rotation motor, reaches fixed effect.

Further, the bottom of the receiving box is obliquely arranged, the side wall connected with the lowest edge of the bottom of the receiving box is hinged on the receiving box, and a Teflon layer is arranged on the inner bottom wall of the receiving box.

By implementing the technical scheme, after most of the wood chips are collected by the receiving box, the wood chips can be accumulated at the lowest position along the inclined bottom. Teflon, a synthetic polymer material using fluorine to replace all hydrogen atoms in polyethylene, has a very low coefficient of friction, and thus when coated on the inner bottom wall of the receiving box, the sawdust can slide down along the inclined bottom more easily; when piling up more back, open articulated lateral wall, concentrate the collection with the saw-dust, reach convenient operation's effect.

Furthermore, the end part of the first slide rail along the length direction of the first slide rail is provided with a supporting plate, the supporting plate is fixedly provided with an air blower, and an air blowing port of the air blower is over against the end part of the first slide rail.

Implement above-mentioned technical scheme, accept the box and can not guarantee to collect all saw-dusts, consequently some saw-dusts can bypass and accept in the box falls first slide rail, at this moment start the air-blower on the layer board, let the mouth of blowing of air-blower just blow the saw-dust in the tip of first slide rail and with first slide rail down for the saw-dust can not influence the transmission of gear, reaches the effect that lets the movable plate normally move.

Further, a connecting plate is arranged on the second slide rail, the connecting plate is opposite to the processing groove and extends in the length direction parallel to the processing groove, a second air cylinder is arranged on the connecting plate, a piston rod of the second air cylinder penetrates through the connecting plate and extends towards the side close to the processing groove, a abutting portion is arranged at the end of the piston rod of the second air cylinder, and the abutting portion is a rubber block.

Implement above-mentioned technical scheme, start the second cylinder, let the piston rod of second cylinder stretch out, the rubber block on the piston rod of second cylinder this moment will support the plank tightly and lie in the position of processing groove top on the workstation, reach and make plank can not gliding effect on the workstation when processing the plank.

Further, be provided with the drilling mechanism who is used for carrying out secondary drilling to the plank on the workstation, drilling mechanism is including being located the workstation and along the third rotation motor that is on a parallel with the length direction slip setting of processing groove, the output shaft end of third rotation motor extends to the direction that is on a parallel with processing groove length, be connected with the drill bit that is used for carrying out secondary drilling to the plank on the output shaft of third rotation motor, the workstation top is provided with the third cylinder, the piston rod of third cylinder extends to being close to the workstation side, the tailpiece of the piston rod of third cylinder is provided with and is used for compressing tightly the briquetting on the workstation with the plank.

When the technical scheme is implemented, when the wood board is drilled for the second time, the wood board is placed on the workbench and positioned below the third air cylinder, the third air cylinder is started, and the press block on the piston rod of the third air cylinder tightly presses the wood board on the workbench; let the third rotate the motor and remove and progressively be close to the side of plank after that, start the third and rotate the motor this moment, let the drill bit on the third rotation motor carry out secondary drilling to the plank, set up like this and make the plank can carry out twice processing on a workstation, let processing more high-efficient and convenient.

In conclusion, the invention has the following beneficial effects: adjusting an adjusting mechanism on the workbench to enable the position to be drilled on the wood board to be opposite to the processing groove, starting a first air cylinder and a first rotating motor, and enabling a cutter to penetrate through the processing groove to drill the wood board; then, the driving mechanism is started to enable the moving plate to slide, and the wood plate is continuously transversely processed after drilling, so that a process hole does not need to be processed manually, and the advantage of efficient drilling is achieved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a first structure according to a first embodiment of the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is a schematic structural diagram illustrating a first slide rail and a first cylinder according to an embodiment of the present invention;

FIG. 4 is an enlarged view of portion B of FIG. 3;

FIG. 5 is a second structural diagram of the first embodiment of the present invention;

FIG. 6 is an enlarged view of section C of FIG. 5;

FIG. 7 is a schematic representation of the structure of a prior art processed wood board.

Reference numerals: 1. a work table; 11. processing a tank; 2. a first slide rail; 21. a dovetail groove; 22. a rack; 23. a support plate; 231. a blower; 3. moving the plate; 31. a first cylinder; 311. a first rotating electric machine; 312. a receiving cartridge; 3121. a support bar; 32. a dovetail block; 33. a second rotating electric machine; 331. a gear; 4. a cutter; 5. an adjustment mechanism; 51. a second slide rail; 511. calibration; 512. a connecting plate; 513. a second cylinder; 5131. a tightening part; 52. a slider; 521. a baffle plate; 522. a fixing member; 6. a third rotating electric machine; 61. a drill bit; 7. a third cylinder; 71. briquetting; 8. a wood board; 81. a plug-in unit; 82. a fabrication hole; 821. a groove.

Detailed Description

In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples thereof.

The technical solutions of the embodiments of the present invention will be described below with reference to the accompanying drawings.

The first embodiment is as follows:

as shown in fig. 1 and 2, the wood board drilling machine comprises a workbench 1, wherein a first slide rail 2 is arranged at the bottom of the workbench 1 on the workbench 1, a moving plate 3 is arranged on the first slide rail 2 in a sliding manner, a cutter 4 for drilling a wood board 8 is arranged on the moving plate 3, a processing groove 11 for allowing the cutter 4 to penetrate through the workbench 1 is arranged on the workbench 1, and the length direction of the slide rail is the same as the length direction of the processing groove 11. An adjusting mechanism 5 for adjusting the position of a hole to be drilled on the wood board 8 is arranged on the workbench 1, and the adjusting mechanism 5 comprises a second slide rail 51 arranged on the workbench 1 along the length direction perpendicular to the processing groove 11 and a slide block 52 arranged on the second slide rail 51 and sliding along the length direction of the second slide rail 51. The slide block 52 is provided with a baffle 521, and the baffle 521 is used for abutting against the wood board 8 placed on the workbench 1; the slider 52 is provided with a fixing member 522 for fixing the slider 52 on the second slide rail 51, the fixing member 522 is a fastening bolt penetrating through the slider 52, and the second slide rail 51 is provided with a scale 511 along the length direction of the second slide rail 51.

When the position of a hole to be drilled on the wood board 8 is adjusted, the sliding block 52 in the second sliding rail 51 is moved, the baffle 521 on the sliding block 52 pushes the wood board 8 to move above the workbench 1, the numerical value of the scale 511 just opposite to the wood board 8 is observed, and after the preset position is reached, the sliding block 52 is fixed in the second sliding rail 51 through the abutting bolt, so that the position of the wood board 8 on the workbench 1 is adjusted more conveniently.

As shown in fig. 1 and 2, the second slide rail 51 is provided with a connecting plate 512, the connecting plate 512 faces the processing tank 11 and extends in a direction parallel to the length direction of the processing tank 11, the connecting plate 512 is provided with a second cylinder 513, a piston rod of the second cylinder 513 passes through the connecting plate 512 and extends to a side close to the processing tank 11, a piston rod end of the second cylinder 513 is provided with a abutting portion 5131, and the abutting portion 5131 is a rubber block.

The second cylinder 513 is started, the piston rod of the second cylinder 513 extends out, the rubber block on the piston rod of the second cylinder 513 abuts against the wood board 8 tightly at the position, above the processing groove 11, on the workbench 1, the effect that the wood board 8 cannot slide on the workbench 1 when the wood board 8 is processed is achieved, and the cutter 4 is enabled to drill the wood board 8 at the preset position.

As shown in fig. 3 and 4, the moving plate 3 is provided with a first air cylinder 31, the first air cylinder 31 is used for driving the tool 4 to move in the processing tank 11 in the vertical direction, a piston rod end of the first air cylinder 31 is provided with a first rotating motor 311, and with reference to fig. 1, the tool 4 is arranged at an output shaft end of the first rotating motor 311 and faces the processing tank 11.

The first cylinder 31 and the first rotating motor 311 are started, so that the piston rod of the first cylinder 31 extends out and drives the rotating cutter 4 to enter the processing groove 11 to process the wood board 8, and at this time, the cutter 4 processes the wood board in the direction perpendicular to the board surface of the wood board 8.

As shown in fig. 3 and 4, a receiving box 312 is disposed through the output shaft of the first rotating motor 311, and referring to fig. 1, the receiving box 312 is disposed opposite to the opening of the processing tank 11, a plurality of support rods 3121 for supporting the receiving box 312 are disposed on the end surface of the first rotating motor 311 opposite to the receiving box 312, the bottom of the receiving box 312 is disposed obliquely, the side wall of the receiving box 312 connected to the lowest edge of the bottom is hinged to the receiving box 312, and a teflon layer is disposed on the inner bottom wall of the receiving box 312.

When the cutter 4 drills the wooden board 8, most of the generated wood chips will fall from the processing tank 11 into the receiving box 312 through the opening above the receiving box 312, and when the receiving box 312 collects most of the wood chips, the wood chips will be accumulated at the lowest position along the inclined bottom. The arranged Teflon layer can enable the sawdust to slide down along the inclined bottom more easily; when piling up more back, open articulated lateral wall, concentrate the collection with the saw-dust, reach convenient operation's effect.

As shown in fig. 3 and 4, a driving mechanism for driving the moving plate 3 to move along the length direction of the first slide rail 2 is disposed on the moving plate 3, the driving mechanism is a second rotating motor 33 disposed on the moving plate 3, an output shaft of the second rotating motor 33 passes through the moving plate 3 and extends to the side opposite to the first slide rail 2, a gear 331 is connected to an output shaft of the second rotating motor 33, and a rack 22 engaged with the gear 331 is disposed on the inner side wall of the slide rail along the length direction of the first slide rail 2.

As shown in fig. 3 and 4, a dovetail block 32 is disposed on the end portion of the moving plate 3 facing the first slide rail 2, and a dovetail groove 21 for the dovetail block 32 to slide is disposed on the end portion of the moving plate 3 facing the first slide rail 2 and along the length direction of the first slide rail 2.

The second rotating motor 33 is started, the second rotating motor 33 drives the gear 331 to rotate, and because the gear 331 is meshed with the rack 22, the gear 331 drives the moving plate 3 to move on the first slide rail 2 under rotation, and at the moment, the dovetail block 32 also slides in the dovetail groove 21, so that the moving plate 3 slides more smoothly; at this time, the wood board 8 is continuously processed in the transverse direction after the drilling, so that the fabrication holes are processed.

As shown in fig. 3, a pallet 23 is arranged at an end of the first slide rail 2 along the length direction of the first slide rail 2, a blower 231 is fixedly arranged on the pallet 23, and an air blowing port of the blower 231 faces the end of the first slide rail 2; the receiving box 312 cannot ensure that all the wood chips are collected, so some wood chips can bypass the receiving box 312 and fall into the first slide rail 2, at this time, the blower 231 on the supporting plate 23 is started, the blowing port of the blower 231 is just opposite to the end part of the first slide rail 2 and blows off the wood chips in the first slide rail 2, the wood chips cannot affect the transmission of the gear 331, and the effect of enabling the moving plate 3 to normally move is achieved.

As shown in fig. 5 and 6, a drilling mechanism for performing secondary drilling on the wood board 8 is arranged on the workbench 1, the drilling mechanism is a third rotating motor 6 located on the workbench 1, the third rotating motor 6 is slidably arranged on the workbench 1 along a direction parallel to the length direction of the processing groove 11, an output shaft end of the third rotating motor 6 extends in a direction parallel to the length direction of the processing groove 11, a drill 61 for performing secondary drilling on the wood board 8 is connected to an output shaft of the third rotating motor 6, a third cylinder 7 is arranged above the workbench 1, a piston rod of the third cylinder 7 extends to a side close to the workbench 1, and a press block 71 for pressing the wood board 8 against the workbench 1 is arranged at a piston rod end of the third cylinder 7.

Placing the wood board 8 on the workbench 1 below the third cylinder 7, starting the third cylinder 7, and enabling the press block 71 on the piston rod of the third cylinder 7 to tightly press the wood board 8 on the workbench 1; let third rotation motor 6 remove and progressively be close to the side of plank 8 after that, start third rotation motor 6 this moment, let drill bit 61 on the third rotation motor 6 carry out secondary drilling to plank 8, set up like this and make plank 8 can carry out twice processing on a workstation 1, let processing more high-efficient and convenient.

The above examples are only used to illustrate the technical solutions of the present invention, and do not limit the scope of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from these embodiments without making any inventive step, fall within the scope of the present invention.

Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art may still make various combinations, additions, deletions or other modifications of the features of the embodiments of the present invention according to the situation without conflict, so as to obtain different technical solutions without substantially departing from the spirit of the present invention, and these technical solutions also fall within the protection scope of the present invention.

Claims

1. A plank drilling machine which characterized in that: including workstation (1), it is provided with first slide rail (2) to lie in workstation (1) bottom on workstation (1), it is provided with movable plate (3) to slide on first slide rail (2), be provided with cutter (4) that are used for driling plank (8) on movable plate (3), be provided with on workstation (1) and supply cutter (4) to pass processing groove (11) of workstation (1), the length direction of first slide rail (2) is the same with the length direction of processing groove (11), be provided with on workstation (1) and be used for adjusting the adjustment mechanism (5) of treating drilling position on plank (8), adjustment mechanism (5) include on workstation (1) along the length direction setting of perpendicular to processing groove (11) second slide rail (51) and set up on second slide rail (51) and along the gliding slider (52) of length direction of second slide rail (51), the sliding block (52) is provided with a baffle (521) which is used for being abutted against a wood board (8) placed on the workbench (1), the sliding block (52) is provided with a fixing piece (522) which is used for fixing the sliding block (52) on a second sliding rail (51), the fixing piece (522) comprises an abutting bolt which is arranged on the sliding block (52) in a penetrating mode, scales (511) are arranged on the second sliding rail (51) along the length direction of the second sliding rail (51), a connecting plate (512) is arranged on the second sliding rail (51), the connecting plate (512) is opposite to the processing groove (11) and extends towards the length direction which is parallel to the processing groove (11), a second air cylinder (513) is arranged on the connecting plate (512), a piston rod of the second air cylinder (513) penetrates through the connecting plate (512) and extends towards the side close to the processing groove (11), and an abutting part (5131) is arranged at the piston rod end of the second air cylinder (513), the abutting part (5131) is a rubber block;

the moving plate (3) is provided with a first cylinder (31) which is used for driving the cutter (4) to move in the processing groove (11) along the vertical direction, a piston rod end of the first cylinder (31) is provided with a first rotating motor (311), and the cutter (4) is arranged at the output shaft end of the first rotating motor (311) and is opposite to the processing groove (11);

be provided with on movable plate (3) and be used for driving movable plate (3) along the actuating mechanism of the length direction removal of first slide rail (2), actuating mechanism is including setting up second rotation motor (33) on movable plate (3), the output shaft of second rotation motor (33) passes movable plate (3) and just extends to first slide rail (2) side, be connected with gear (331) on the output shaft of second rotation motor (33), be provided with rack (22) with gear (331) meshing along the length direction of first slide rail (2) on the inside wall of first slide rail (2).

2. The board drilling machine according to claim 1, characterized in that: the end part of the moving plate (3) opposite to the first sliding rail (2) is provided with a dovetail block (32), and the first sliding rail (2) opposite to the end part of the moving plate (3) and provided with a dovetail groove (21) for the dovetail block (32) to slide along the length direction of the first sliding rail (2).

3. The board drilling machine according to claim 1, characterized in that: a receiving box (312) is arranged on an output shaft of the first rotating motor (311) in a penetrating mode, the receiving box (312) is arranged right opposite to an opening at the end of the machining groove (11), and a plurality of supporting rods (3121) used for supporting the receiving box (312) are arranged on the end face, right opposite to the receiving box (312), of the first rotating motor (311).

4. The board drilling machine according to claim 3, characterized in that: the bottom of the receiving box (312) is obliquely arranged, the side wall connected with the lowest edge of the bottom of the receiving box (312) is hinged on the receiving box (312), and a Teflon layer is arranged on the inner bottom wall of the receiving box (312).

5. The board drilling machine according to claim 1, characterized in that: the end part of the first sliding rail (2) along the length direction of the first sliding rail (2) is provided with a supporting plate (23), the supporting plate (23) is fixedly provided with an air blower (231), and an air blowing port of the air blower (231) is over against the end part of the first sliding rail (2).

6. The board drilling machine according to claim 1, characterized in that: be provided with the drilling mechanism that is used for carrying out secondary drilling to plank (8) on workstation (1), drilling mechanism is including being located workstation (1) and along the third rotation motor (6) that slides the setting of the length direction that is on a parallel with processing groove (11), the output shaft end of third rotation motor (6) extends to the direction that is on a parallel with processing groove (11) length, be connected with drill bit (61) that are used for carrying out secondary drilling to plank (8) on the output shaft of third rotation motor (6), workstation (1) top is provided with third cylinder (7), the piston rod of third cylinder (7) extends to being close to workstation (1) side, the tailpiece of the piston rod of third cylinder (7) is provided with and is used for compressing tightly briquetting (71) on workstation (1) with plank (8).