Gluing mechanism with anti-blocking function

Abstract

The utility model relates to the technical field of gluing mechanisms, and provides a gluing mechanism with an anti-blocking function, which comprises a box body and an anti-blocking structure, a box door is mounted on one side of the box body, a clamping seat is fixed in the box body, a plate is placed at the top end of the clamping seat, a moving structure is fixed at the top end in the box body, and the anti-blocking structure is fixed at the bottom end of the box body. And an anti-blocking structure is fixed at the top end of the box body. The anti-blocking structure is arranged, colloid is continuously heated and insulated through the heating plate, the colloid is prevented from being solidified and blocked in the conveying process, and the colloid is stirred through the stirring rod, so that the colloid is kept in a flowing state in the conveying process, the colloid is further prevented from being blocked, and the service life of the colloid is prolonged. Furthermore, the colloid is subjected to friction force to generate forward thrust through rotation of the spiral blade, so that the colloid is discharged from the interior of the discharging pipe and then is discharged outwards under the guiding effect of the flow guide hole, and the situations of stagnation, solidification and filling of the colloid in the anti-blocking head are prevented.

Description

Technical Field

[0001] This utility model relates to the field of gluing mechanism technology, and in particular to a gluing mechanism with anti-clogging function. Background Technology

[0002] A gluing mechanism is a component or device that has the function of bonding two or more materials together in a specific way. A gluing mechanism with anti-clogging function is a mechanism that can prevent the glue or material from clogging during the production of plywood or other materials that require gluing, and ensure the smooth progress of the gluing work.

[0003] To address this, patent CN216396933U discloses a bonding mechanism for sandwich color steel plates, relating to the field of color steel plate bonding. This invention includes a shell, a bonding box fixed in the middle of the top of the shell, a base fixed to the bottom of the shell, a cleaning component on one side of the shell, a motor mounted on the outer surface of the shell, a conveyor roller connected to the motor's output end, and a conveyor belt sleeved on the outer surface of the conveyor roller. This invention, by incorporating a cleaning component, allows the height of the telescopic collection bin to be adjusted after the color steel plate on the conveyor belt has been coated and conveyed, enabling the color steel plate to pass through the insertion opening. During the passage of the color steel plate through the insertion opening, the user can appropriately press the guide plate to allow the upper part of the inner wall of the insertion opening to contact the excess glue applied to the color steel plate, scraping off the excess glue. The glue can then slide along the guide plate into the telescopic collection bin for storage, preventing waste and avoiding waste caused by excessive glue application.

[0004] The aforementioned bonding mechanism for producing sandwich color steel panels is not convenient for heating the glue inside the bonding box during use, which makes the glue inside the bonding box prone to solidification. This causes the glue to solidify and cause blockage when discharging, resulting in low practicality. Utility Model Content

[0005] The purpose of this invention is to provide a gluing mechanism with anti-clogging function to solve the defect that existing gluing mechanisms are not easy to prevent clogging.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a gluing mechanism with anti-clogging function, including a housing and an anti-clogging structure;

[0007] A door is installed on one side of the box, and a clamping seat is fixed inside the box, with a plate placed on the top of the clamping seat;

[0008] A movable structure is fixed at the top of the interior of the box.

[0009] The top end of the box is fixed with the anti-blocking structure, the anti-blocking structure includes the jar, the hot plate, the feeding pipe, the second motor, the third rotating shaft, the stirring rod, the scraper, the discharge pipe, the fourth rotating shaft, the spiral blade, the anti-blocking head, the mounting screw, the flow guide hole and the exhaust hole, the top end of the box is fixed with the jar, the inside of the jar is provided with the hot plate, one side of the top end of the jar is fixed with the feeding pipe, the middle position of the top end of the jar is fixed with the second motor, the output end of the second motor is fixed with the third rotating shaft, the outside of the third rotating shaft in the jar is fixed with the stirring rod, one end of the stirring rod is fixed with the scraper, the top end of the jar is fixed with the discharge pipe, the bottom end of the third rotating shaft in the discharge pipe is fixed with the fourth rotating shaft, the outside of the fourth rotating shaft is fixed with the spiral blade, the bottom end of the discharge pipe is installed with the anti-blocking head, the inside of the anti-blocking head and the discharge pipe is installed with the mounting screw, the inside of the anti-blocking head is fixed with the flow guide hole, the both sides of the anti-blocking head are provided with the exhaust hole.

[0010] Preferably, the moving structure includes a moving frame, an internal cavity, a limiting groove, a sliding block, a hydraulic push rod, a first reciprocating screw rod, a second reciprocating screw rod, a first bevel gear, a second bevel gear, a first rotating shaft, a first motor, a driving wheel, a driven wheel, a transmission belt, a threaded seat, a sliding groove, a supporting plate, a second rotating shaft and a pressure roller, the moving frame is installed in the inside of the box, the inside of the moving frame is provided with an internal cavity, the both sides of the inside of the box are provided with a limiting groove, the outside of the moving frame in the limiting groove is fixed with a sliding block, the top end of the inside of the box is fixed with a hydraulic push rod, one side of the inside of the internal cavity is provided with a first reciprocating screw rod, the other side of the inside of the internal cavity is provided with a second reciprocating screw rod, one end of the outside of the first reciprocating screw rod is fixed with a first bevel gear, one side of the first bevel gear is installed with a second bevel gear, the top end of the second bevel gear is fixed with a first rotating shaft, the top end of the first rotating shaft is fixed with a first motor, the other end of the outside of the first reciprocating screw rod is fixed with a driving wheel, one end of the outside of the second reciprocating screw rod is fixed with a driven wheel, the outside of the driving wheel and the driven wheel is installed with a transmission belt, the outside of the first reciprocating screw rod and the second reciprocating screw rod is installed with a threaded seat, the both sides of the bottom end of the moving frame are provided with a sliding groove, the bottom end of the threaded seat in the sliding groove is fixed with a supporting plate, one side of the supporting plate is installed with a second rotating shaft, the outside of the second rotating shaft is fixed with a pressure roller.

[0011] Preferably, the moving frame is square, the sliding blocks are equidistantly distributed on the outside of the moving frame, the sliding blocks and the box are slidably connected through the limiting grooves, the output end of the hydraulic push rod is fixedly connected with the top end of the moving frame, and the hydraulic push rods are symmetrically distributed on the top end of the moving frame.

[0012] Through the above structure, in use, the moving frame is driven to slide downward by starting the hydraulic push rod, and then the sliding block slides in the hydraulic push rod, thereby limiting the sliding of the moving frame, and the stability of the moving frame during lifting is improved.

[0013] Preferably, the first and second reciprocating screw rods are symmetrically distributed inside the built-in cavity, the two ends of the first and second reciprocating screw rods extend through the two sides of the built-in cavity to the inside of the moving frame and are rotatably connected with the inside of the moving frame, and the first and second bevel gears are meshingly connected.

[0014] Through the above structure, in use, the second bevel gear is driven to rotate by the first bevel gear, and then the stability of the first reciprocating screw rod during rotation is improved through the meshing connection of the teeth.

[0015] Preferably, the threaded seats are threadedly connected with the first and second reciprocating screw rods, the two ends of the second rotating shaft extend through the inside of the support plate and are rotatably connected with the inside of the support plate, and the bottom side of the compression roller abuts against the top end of the plate.

[0016] Through the above structure, in use, the threaded seats are moved through the synchronous rotation of the first and second reciprocating screw rods, and then the two sets of support plates are synchronously moved, and then the second rotating shaft drives the compression roller to rotate through the rotatable connection of the two ends of the second rotating shaft with the inside of the support plate during the movement of the support plate, so that the compression roller conveniently rolls the surface of the plate, and the gluing efficiency of the plate is improved.

[0017] Preferably, the bottom end of the third rotating shaft extends to the inside of the tank through the top end of the tank and is fixedly connected with the top end of the fourth rotating shaft, and the stirring rods are equidistantly distributed on the outside of the third rotating shaft.

[0018] Through the above structure, in use, the colloid inside the tank is conveniently stirred by the stirring rods, and the flowing state of the colloid during conveying is ensured, so that the colloid is prevented from being blocked.

[0019] Preferably, one side of the scraper abuts against the inner wall of the tank, the scraper is made of rubber material, and the bottom end of the discharge pipe extends to the inside of the box through the top end of the box.

[0020] Through the above structure, in use, the colloid adhered to the inner wall of the tank is scraped off by the scraper, and the scraper is made of rubber material, so that the inner wall of the tank is not damaged during scraping, and the practicality is improved.

[0021] The gluing mechanism with the anti-blocking function has the advantages that:

[0022] Through the mobile structure, the screw seat is driven to move through the synchronous rotation of the first reciprocating screw rod and the second reciprocating screw rod, so that the support plate drives the second rotating shaft to move, and the pressure roller is driven to move by the second rotating shaft to repeatedly roll the surface of the plate, so that the colloid on the surface of the plate can be more uniformly distributed, and the gluing processing efficiency of the plate is improved.

[0023] Through the anti-blocking structure, the colloid is continuously heated by the heating plate to prevent solidification and blockage during conveying, and the colloid is stirred by the stirring rod, so that the colloid maintains a flowing state during conveying, thereby further preventing the colloid from being blocked, and further, the forward thrust of the colloid is generated by the friction of the spiral blade rotation, so that the colloid is discharged from the inside of the discharge pipe, and then discharged outward under the guidance of the guide hole, preventing the colloid from stagnating, solidifying and filling in the anti-blocking head. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a three-dimensional structure schematic view of the utility model;

[0025] Figure 2 It is a front view cross-sectional structure schematic view of the utility model;

[0026] Figure 3 It is a Figure 2 enlarged structure schematic view of A in the utility model;

[0027] Figure 4 It is a moving frame top view cross-sectional structure schematic view of the utility model;

[0028] Figure 5 It is a Figure 4 enlarged structure schematic view of B in the utility model.

[0029] Brief description of signs in the drawing: 1, box; 2, box door; 3, clamping seat; 4, plate; 5, mobile structure; 501, moving frame; 502, built-in cavity; 503, limiting groove; 504, sliding block; 505, hydraulic push rod; 506, first reciprocating screw rod; 507, second reciprocating screw rod; 508, first bevel gear; 509, second bevel gear; 510, first rotating shaft; 511, first motor; 512, driving wheel; 513, driven wheel; 514, transmission belt; 515, screw seat; 516, sliding groove; 517, support plate; 518, second rotating shaft; 519, pressure roller; 6, anti-blocking structure; 601, tank; 602, heating plate; 603, feeding pipe; 604, second motor; 605, third rotating shaft; 606, stirring rod; 607, scraper; 608, discharge pipe; 609, fourth rotating shaft; 610, spiral blade; 611, anti-blocking head; 612, mounting screw; 613, guide hole; 614, exhaust hole. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0031] Please refer to Figures 1-5 The glue mechanism with the anti-blocking function provided by the present application comprises a box body 1 and an anti-blocking structure 6.

[0032] Refer to Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, the box 1 is provided with a box door 2 on one side, and a clamping seat 3 is fixed inside the box 1, and a plate 4 is placed on the top end of the clamping seat 3, and a moving structure 5 is fixed on the top end inside the box 1, and the moving structure 5 comprises a moving frame 501, an internal cavity 502, a limiting groove 503, a sliding block 504, a hydraulic push rod 505, a first reciprocating lead screw 506, a second reciprocating lead screw 507, a first bevel gear 508, a second bevel gear 509, a first rotating shaft 510, a first motor 511, a driving wheel 512, a driven wheel 513, a transmission belt 514, a threaded seat 515, a sliding groove 516, a supporting plate 517, a second rotating shaft 518 and a compression roller 519, the moving frame 501 is installed inside the box 1, the internal cavity 502 is arranged inside the moving frame 501, the limiting grooves 503 are arranged on both sides of the box 1, the sliding blocks 504 are fixed to the outside of the moving frame 501 inside the limiting grooves 503, the hydraulic push rod 505 is fixed on the top end inside the box 1, the first reciprocating lead screw 506 is arranged on one side inside the internal cavity 502, the second reciprocating lead screw 507 is arranged on the other side inside the internal cavity 502, the first bevel gear 508 is fixed to one end of the outside of the first reciprocating lead screw 506, the second bevel gear 509 is installed on one side of the first bevel gear 508, the first rotating shaft 510 is fixed to the top end of the second bevel gear 509, the first motor 511 is fixed to the top end of the first rotating shaft 510, the driving wheel 512 is fixed to the other end of the outside of the first reciprocating lead screw 506, the driven wheel 513 is fixed to one end of the outside of the second reciprocating lead screw 507, the transmission belt 514 is installed on the outside of the driving wheel 512 and the driven wheel 513, the threaded seats 515 are installed on the outside of the first reciprocating lead screw 506 and the second reciprocating lead screw 507, the sliding grooves 516 are arranged on both sides of the bottom end of the moving frame 501, the supporting plates 517 are fixed to the bottom end of the threaded seats 515 inside the sliding grooves 516, the second rotating shaft 518 is installed on one side of the supporting plate 517, the compression roller 519 is fixed to the outside of the second rotating shaft 518, the moving frame 501 is square-shaped, the sliding blocks 504 are distributed at equal intervals on the outside of the moving frame 501, the sliding blocks 504 and the box 1 are slidably connected through the limiting grooves 503, the output end of the hydraulic push rod 505 is fixedly connected to the top end of the moving frame 501, the hydraulic push rod 505 is symmetrically distributed on the top end of the moving frame 501, the first reciprocating lead screw 506 and the second reciprocating lead screw 507 are symmetrically distributed inside the internal cavity 502, the two ends of the first reciprocating lead screw 506 and the second reciprocating lead screw 507 respectively extend to the inside of the moving frame 501 through the two sides of the internal cavity 502 and are rotationally connected to the inside of the moving frame 501, the first bevel gear 508 is meshedly connected with the second bevel gear 509, the threaded seats 515 are threadedly connected with the first reciprocating lead screw 506 and the second reciprocating lead screw 507 respectively, the two ends of the second rotating shaft 518 respectively penetrate the inside of the supporting plate 517 and are rotationally connected to the inside of the supporting plate 517, and the bottom side of the compression roller 519 abuts against the top end of the plate 4.

[0033] By starting the hydraulic push rod 505 to drive the moving frame 501 to slide down inside the limiting groove 503 through the sliding block 504, so that the compression roller 519 is in contact with the surface of the plate 4, and then by starting the first motor 511 to drive the first shaft 510 to rotate, the second bevel gear 509 is engaged and connected with the first bevel gear 508, and then drives the first bevel gear 508 to rotate, so that the first reciprocating lead screw 506 drives the first reciprocating lead screw 506 to rotate to drive the driven roller 513 to rotate under the action of the transmission belt 514, so that the first reciprocating lead screw 506 and the second reciprocating lead screw 507 rotate synchronously to drive the threaded seat 515 to move, so that the threaded seat 515 drives the support plate 517 to slide inside the sliding groove 516, and then the support plate 517 drives the second shaft 518 to move, so that the second shaft 518 drives the compression roller 519 to move and repeatedly rolls the surface of the plate 4, so that the glue on the surface of the plate 4 can be distributed more evenly, and the gluing processing efficiency of the plate is improved.

[0034] Referring to Figures 1-3 As shown in the figure, the top end of the box body 1 is fixed with the anti-blocking structure 6, the anti-blocking structure 6 includes the tank body 601, the heating plate 602, the feeding pipe 603, the second motor 604, the third shaft 605, the stirring rod 606, the scraper 607, the discharge pipe 608, the fourth shaft 609, the spiral blade 610, the anti-blocking head 611, the mounting screw 612, the flow guide hole 613 and the exhaust hole 614, the top end of the box body 1 is fixed with the tank body 601, the inside of the tank body 601 is provided with the heating plate 602, one side of the top end of the tank body 601 is fixed with the feeding pipe 603, the middle position of the top end of the tank body 601 is fixed with the second motor 604, the output end of the second motor 604 is fixed with the third shaft 605, the outside of the third shaft 605 inside the tank body 601 is fixed with the stirring rod 606, one end of the stirring rod 606 is fixed with the scraper 607, the top end of the tank body 601 is fixed with the discharge pipe 608, the bottom end of the third shaft 605 inside the discharge pipe 608 is fixed with the fourth shaft 609, the outside of the fourth shaft 609 is fixed with the spiral blade 610, the bottom end of the discharge pipe 608 is installed with the anti-blocking head 611, the inside of the anti-blocking head 611 and the discharge pipe 608 is installed with the mounting screw 612, the inside of the anti-blocking head 611 is fixed with the flow guide hole 613, both sides of the anti-blocking head 611 are provided with the exhaust hole 614, the bottom end of the third shaft 605 extends through the top end of the tank body 601 to the inside of the tank body 601 and is fixedly connected with the top end of the fourth shaft 609, the stirring rod 606 is distributed at equal intervals on the outside of the third shaft 605, one side of the scraper 607 is in contact with the inner wall of the tank body 601, the scraper 607 is made of rubber material, and the bottom end of the discharge pipe 608 extends through the top end of the box body 1 to the inside of the box body 1.

[0035] The colloid is added into the inside of the tank body 601 through the feeding pipe 603, and then the colloid is continuously heated and kept warm through the heating plate 602, so as to prevent the colloid from solidifying and blocking during the conveying process; the stirring rod 606 stirs the colloid by driving the third rotating shaft 605 to rotate through the second motor 604, so as to ensure that the colloid keeps a flowing state during the conveying process, thereby further preventing the colloid from blocking; meanwhile, the scraper 607 scrapes the colloid on the inner wall of the tank body 601 by rotating with the stirring rod 606; the fourth rotating shaft 609 is further driven to rotate by the rotation of the third rotating shaft 605, so as to drive the helical blade 610 to rotate, and the colloid is subjected to a forward thrust generated by friction, thereby making the colloid be continuously lifted by the helical blade 610 and conveyed forward along the helical shaft direction, until reaching the bottom end of the discharging pipe 608 and being discharged; meanwhile, the anti-blocking head 611 is installed at the bottom end of the discharging pipe 608, so that the colloid passes through the anti-blocking head 611 and is discharged outward under the guiding action of the flow guide hole 613, thereby preventing the colloid from stagnating, solidifying and blocking in the anti-blocking head 611.

[0036] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A gluing mechanism with anti-blocking function, comprising a box (1) and an anti-blocking structure (6); Characterized in that: One side of the box (1) is provided with a box door (2), and the inside of the box (1) is fixedly provided with a clamping seat (3), and the top end of the clamping seat (3) is placed with a plate (4); The top end of the inside of the box (1) is fixedly provided with a moving structure (5); The top end of the box (1) is fixedly provided with an anti-blocking structure (6), which comprises a tank (601), a heating plate (602), a feeding pipe (603), a second motor (604), a third rotating shaft (605), a stirring rod (606), a scraper (607), a discharging pipe (608), a fourth rotating shaft (609), a spiral blade (610), an anti-blocking head (611), a mounting screw (612), a flow guide hole (613) and an exhaust hole (614), the top end of the box (1) is fixedly provided with the tank (601), the inside of the tank (601) is provided with the heating plate (602), one side of the top end of the tank (601) is fixedly provided with the feeding pipe (603), the middle position of the top end of the tank (601) is fixedly provided with the second motor (604), the output end of the second motor (604) is fixedly provided with the third rotating shaft (605), the outside of the third rotating shaft (605) in the tank (601) is fixedly provided with the stirring rod (606), one end of the stirring rod (606) is fixedly provided with the scraper (607), the top end of the tank (601) is fixedly provided with the discharging pipe (608), the bottom end of the third rotating shaft (605) in the discharging pipe (608) is fixedly provided with the fourth rotating shaft (609), the outside of the fourth rotating shaft (609) is fixedly provided with the spiral blade (610), the bottom end of the discharging pipe (608) is provided with the anti-blocking head (611), the inside of the anti-blocking head (611) and the discharging pipe (608) are both provided with the mounting screw (612), the inside of the anti-blocking head (611) is fixedly provided with the flow guide hole (613), and the two sides of the anti-blocking head (611) are provided with the exhaust hole (614).

2. The gluing mechanism with anti-blocking function according to claim 1, characterized in that: The moving structure (5) comprises a moving frame (501), a built-in cavity (502), a limiting groove (503), a sliding block (504), a hydraulic push rod (505), a first reciprocating screw rod (506), a second reciprocating screw rod (507), a first bevel gear (508), a second bevel gear (509), a first rotating shaft (510), a first motor (511), a driving wheel (512), a driven wheel (513), a transmission belt (514), a threaded seat (515), a sliding groove (516), a supporting plate (517), a second rotating shaft (518) and a compression roller (519), the moving frame (501) is installed in the inside of the box body (1), the inside of the moving frame (501) is provided with the built-in cavity (502), both sides of the inside of the box body (1) are provided with the limiting groove (503), the outside of the moving frame (501) in the limiting groove (503) is fixedly provided with the sliding block (504), the top of the inside of the box body (1) is fixedly provided with the hydraulic push rod (505), one side of the inside of the built-in cavity (502) is provided with the first reciprocating screw rod (506), the other side of the inside of the built-in cavity (502) is provided with the second reciprocating screw rod (507), one end of the outside of the first reciprocating screw rod (506) is fixedly provided with the first bevel gear (508), one side of the first bevel gear (508) is installed with the second bevel gear (509), the top of the second bevel gear (509) is fixedly provided with the first rotating shaft (510), the top of the first rotating shaft (510) is fixedly provided with the first motor (511), the other end of the outside of the first reciprocating screw rod (506) is fixedly provided with the driving wheel (512), one end of the outside of the second reciprocating screw rod (507) is fixedly provided with the driven wheel (513), the outside of the driving wheel (512) and the driven wheel (513) is installed with the transmission belt (514), the outside of the first reciprocating screw rod (506) and the second reciprocating screw rod (507) is installed with the threaded seat (515), both sides of the bottom of the moving frame (501) are provided with the sliding groove (516), the bottom of the threaded seat (515) in the sliding groove (516) is fixedly provided with the supporting plate (517), one side of the supporting plate (517) is installed with the second rotating shaft (518), the outside of the second rotating shaft (518) is fixedly provided with the compression roller (519).

3. The gluing mechanism with anti-blocking function according to claim 2, characterized in that: The moving frame (501) is square, the sliding blocks (504) are equidistantly distributed on the outside of the moving frame (501), the sliding blocks (504) and the box body (1) are slidably connected through the limiting grooves (503), the output end of the hydraulic push rod (505) is fixedly connected with the top of the moving frame (501), and the hydraulic push rod (505) is symmetrically distributed on the top of the moving frame (501).

4. The gluing mechanism with anti-blocking function according to claim 2, characterized in that: The first reciprocating screw rod (506) and the second reciprocating screw rod (507) are symmetrically distributed inside the built-in cavity (502), the two ends of the first reciprocating screw rod (506) and the second reciprocating screw rod (507) extend to the inside of the moving frame (501) through the two sides of the built-in cavity (502) and are rotationally connected with the inside of the moving frame (501), and the first bevel gear (508) is meshingly connected with the second bevel gear (509).

5. The gluing mechanism with anti-blocking function according to claim 2, characterized in that: The threaded seat (515) is threadedly connected with the first reciprocating screw rod (506) and the second reciprocating screw rod (507), respectively, the two ends of the second rotating shaft (518) extend through the inside of the support plate (517) and are rotationally connected with the inside of the support plate (517), and the bottom side of the compression roller (519) abuts against the top end of the plate (4).

6. The gluing mechanism with anti-blocking function according to claim 1, characterized in that: The bottom end of the third rotating shaft (605) extends to the inside of the tank body (601) through the top end of the tank body (601) and is fixedly connected with the top end of the fourth rotating shaft (609), and the stirring rods (606) are equidistantly distributed on the outside of the third rotating shaft (605).

7. The gluing mechanism with anti-blocking function according to claim 1, characterized in that: One side of the scraper (607) abuts against the inner wall of the tank body (601), the scraper (607) is made of rubber material, and the bottom end of the discharge pipe (608) extends to the inside of the box body (1) through the top end of the box body (1).

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