CN214827504U - Corrugated paper feeding mechanism - Google Patents

Abstract

The application relates to the technical field of corrugated paper production, in particular to a corrugated paper feeding mechanism, which comprises a rack extending along the horizontal direction, wherein two rotating rollers are rotatably connected on the rack, the two rotating rollers are sequentially arranged along the length direction of the rack, the axial direction of the rotating rollers is perpendicular to the extending direction of the rack, the two rotating rollers are sleeved with the same rotating belt, a motor is arranged on the rack, an output shaft of the motor is connected with one rotating roller, the rotating belt is provided with a plurality of air holes, all the air holes are sequentially arranged along the moving direction of the rotating belt, the rack is provided with a dust collection assembly for cleaning the upper surface of corrugated paper and an adsorption assembly for adsorbing the corrugated paper on the rotating belt, the dust collection assembly is positioned right above the adsorption assembly, a conveying path of the rotating belt penetrates through the dust collection assembly and the adsorption assembly, and the rotating belt is provided with a plurality of pushing pieces, all the pushing pieces are sequentially arranged along the moving direction of the rotating belt. The application can reduce the influence of dust on the working environment.

Description

Corrugated paper feeding mechanism

Technical Field

The application relates to the technical field of corrugated paper production, in particular to a corrugated paper feeding mechanism.

Background

Corrugated paper is commonly used for packaging food or digital products in modern life, is relatively environment-friendly and widely used, and manufacturers need to print the corrugated paper along with the increase of the packaging requirements.

In prior art, during corrugated paper production, the workman need place the corrugated paper on the conveyer belt, carries printer department with it and prints, and when the corrugated paper was placed on the conveyer belt, the printing face of corrugated paper was up, and the in-process of printer is carried to the corrugated paper, and the workman need handheld spray gun to clear up the upper surface of corrugated paper, reduces the influence of dust to corrugated paper printing effect.

However, when the spray gun is used for cleaning the upper surface of the corrugated paper, dust is easy to scatter in a workshop, so that the spray gun is not environment-friendly enough and is easy to influence the working environment of workers.

SUMMERY OF THE UTILITY MODEL

In order to reduce the influence of dust to operational environment, this application provides a corrugated paper feeding mechanism.

The application provides a pair of corrugated paper feeding mechanism adopts following technical scheme: a corrugated paper feeding mechanism comprises a rack extending along the horizontal direction, wherein two rotating rollers are rotatably connected to the rack, the two rotating rollers are sequentially arranged along the length direction of the rack, the axial direction of each rotating roller is perpendicular to the extending direction of the rack, a same rotating belt for conveying corrugated paper is sleeved on each rotating roller, a motor is arranged on the rack, an output shaft of the motor is coaxially connected with one rotating roller, a plurality of air holes are formed in each rotating belt, all the air holes are sequentially arranged along the moving direction of each rotating belt, a dust collection assembly for cleaning the upper surface of the corrugated paper and an adsorption assembly for adsorbing the corrugated paper on each rotating belt are arranged on the rack, the dust collection assembly is positioned right above the adsorption assembly, a conveying path of each rotating belt penetrates through the dust collection assembly and the adsorption assembly, and a plurality of pushing pieces for pushing the corrugated paper to move are arranged on each rotating belt, all the pushing pieces are sequentially arranged along the moving direction of the rotating belt.

By adopting the technical scheme, when workers need to convey corrugated paper, the workers place the corrugated paper on the rotating belt, the pushing piece is abutted against one end of the corrugated paper far away from the adsorption component, a worker starts the motor, the motor drives the rotating roller to rotate, thereby driving the rotating belt to convey the corrugated paper, starting the adsorption component and the dust absorption component by workers, when the corrugated paper passes between the adsorption component and the dust absorption component, the corrugated paper is adsorbed on the rotary belt by the adsorption component through the air holes, the dust on the corrugated paper is absorbed by the dust absorption component at the moment, the adsorption force of the adsorption component is greater than the suction force of the dust absorption component, the rotary belt continuously rotates, the corrugated paper is pushed away from the space between the adsorption component and the dust absorption component by the pushing component at the moment, therefore, the corrugated paper cleaning device is convenient for workers to collect dust while cleaning the corrugated paper, the dust is not easy to float in a workshop, and the influence of the dust on the working environment is reduced.

Optionally, dust collection assembly is including the suction hood that is the level setting, the opening orientation of suction hood rotates the area, the suction hood is connected in the top that frame and suction hood are located the rotation area, the width direction of suction hood along the frame extends, the suction hood is connected with the dust catcher through the dust absorption pipe, the dust catcher is located the frame.

Through adopting above-mentioned technical scheme, when the workman need clear up the dust, the workman starts the dust catcher, and the dust catcher drives dust and tuber wind and gets into the dust catcher through suction hood, dust absorption pipe in proper order, has made things convenient for the workman to clear up the dust, reduces the influence of dust to operational environment.

Optionally, the adsorption component includes the suction hood, the suction hood extends along the width direction of frame, the suction hood is connected with the air exhauster through the exhaust column, the air exhauster is located the frame, the suction hood is located between the circular path of rolling strip, the opening of suction hood is towards dust collection component.

Through adopting above-mentioned technical scheme, when the workman need use adsorption component, the workman starts the air exhauster, and the air exhauster drives during wind passes through bleeder vent, exhaust hood, exhaust column entering air exhauster in proper order, and pressure reduction between corrugated paper and the rotation area this moment for the corrugated paper adsorbs on the rotation area, makes the corrugated paper be difficult for leaving the rotation area.

Optionally, the one end in area is for placing the end of placing of corrugated paper rotated, one side that the dust hood kept away from the end of placing is equipped with the brush that is used for conflicting corrugated paper surface, the brush extends along the length direction of dust hood.

Through adopting above-mentioned technical scheme, when the corrugated paper when between suction hood and the adsorption component, the brush is contradicted in the corrugated paper, will attach to the dust on the corrugated paper and sweep off, and the suction hood clears up the dust again, has further improved the clearance effect to the corrugated paper.

Optionally, a sliding groove extending along the length direction of the dust collection cover is formed in the dust collection cover, one end of the sliding groove penetrates through the outer wall of the dust collection cover, and an embedded block inserted in the sliding groove in a sliding mode is arranged on the hairbrush.

Through adopting above-mentioned technical scheme, when the brush needs the clearance, workman pulling brush makes the abaculus piece slide in the sliding tray, and the abaculus piece separates through the notch and the suction hood of sliding tray, and the workman has cleared up the brush after, will inlay the piece and slide again and inlay and establish in the sliding tray to made things convenient for workman's clearance brush, further improved the clearance effect to the corrugated paper.

Optionally, a penetrating groove communicated with the sliding groove is formed in the outer wall of the dust hood, a positioning rod is inserted in the penetrating groove, the axial direction of the positioning rod is perpendicular to the extending direction of the sliding groove, and a positioning hole for inserting the positioning rod is formed in the embedding block.

Through adopting above-mentioned technical scheme, when inlaying the establishing piece and pegging graft completely in the sliding tray, the workman promotes the locating lever, and the locating lever slides and inserts in the locating hole wearing to establish the inslot for inlay the establishing piece and be difficult for sliding in the sliding tray, and then improved the stability of brush.

Optionally, a spring for urging the positioning rod to be inserted into the positioning hole is arranged on the dust hood, one end of the spring is connected with the dust hood, and the other end of the spring is connected with the positioning rod.

Through adopting above-mentioned technical scheme, when the workman need install the brush, workman pulling locating lever, the locating lever sinks towards the one end of sliding tray and wears to establish the inslot, and the spring takes place to deform, and the workman promotes again to inlay the piece and makes it insert the sliding tray in, and until locating lever and locating hole correspond the back, the workman loosens the locating lever, and the spring returns to natural state and promotes the locating lever and makes it insert in the locating hole, has made things convenient for workman's installation locating lever, has improved the stability of locating lever.

Optionally, be equipped with in the frame and be used for adjusting the suction hood opening and rotate the adjustment subassembly of taking the interval, the adjustment subassembly is including rotating the lead screw of connecting in the frame, the axis perpendicular to of lead screw rotates the face that the area is used for carrying the corrugated paper, the lead screw is trained the level with the suction hood screw, be equipped with the guide arm of wearing to locate the suction hood in the frame, the axial of guide arm is the same with the axial of lead screw.

Through adopting above-mentioned technical scheme, when the thickness of corrugated paper changed, the workman rotated the lead screw for the lead screw is rotatory around self axis, and lead screw and suction hood threaded connection make the suction hood slide on the guide arm, and the interval between suction hood and the rotation band changes, thereby is applicable to the corrugated paper of clearance different thickness.

To sum up, the application comprises the following beneficial technical effects:

1. through the arrangement of the rack, the rotating roller, the rotating belt, the motor, the air holes, the pushing piece, the dust collection component and the adsorption component, workers can conveniently clean dust on the surface of corrugated paper, so that the dust is not easy to float in a workshop, and the influence of the dust on the working environment is reduced;

2. the arrangement of the brush further improves the cleaning effect on the corrugated paper;

3. through the arrangement of the sliding groove and the embedded block, the brush can be conveniently replaced by workers, and the cleaning effect on the corrugated paper is further improved;

4. the arrangement of the positioning rod, the penetrating groove, the positioning hole and the spring improves the stability of the hairbrush;

5. through the setting of adjustment subassembly, be applicable to the corrugated paper of clearance different thickness.

Drawings

FIG. 1 is a schematic diagram of the overall structure in the embodiment of the present application;

FIG. 2 is a schematic view of a portion of a chassis hidden in an embodiment of the present application for illustrating a suction assembly and a dust suction assembly;

FIG. 3 is a schematic view of the brush and adjustment assembly of the present application;

fig. 4 is a schematic structural view showing a positioning rod, a positioning hole, a spring, and a through groove in the embodiment of the present application.

Reference numerals: 1. a frame; 11. a rotating roller; 12. a rotating belt; 121. air holes are formed; 122. a pusher member; 13. a motor; 14. a placing end; 15. a feeding end; 2. a dust collection assembly; 21. a dust hood; 22. a dust collection pipe; 23. a vacuum cleaner; 3. an adsorption component; 31. an air draft cover; 32. an exhaust pipe; 33. an exhaust fan; 4. a brush; 41. embedding a block; 42. a sliding groove; 43. a groove is arranged in a penetrating way; 44. positioning a rod; 45. positioning holes; 46. a spring; 5. an adjustment assembly; 51. a screw rod; 52. a guide bar; 53. rotating the handle; 54. and (4) connecting the blocks.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses corrugated paper feeding mechanism. As shown in fig. 1 and 2, a corrugated paper feeding mechanism, including the frame 1 that extends along the horizontal direction, the both ends of frame 1 are all rotated and are connected with live-rollers 11, the axial of live-rollers 11 is the level setting, and the axial of live-rollers 11 is the same with the width direction of frame 1, two live-rollers 11 cover are equipped with same rolling tape 12 that is used for carrying the corrugated paper, live-tape 12 is the level setting, the end 14 of placing of corrugated paper is placed for the workman to the one end of rolling tape 12, the other end of rolling tape 12 is pay-off end 15. The frame 1 is fixedly connected with a motor 13, the axial direction of an output shaft of the motor 13 is the same as the width direction of the frame 1, and the output shaft of the motor 13 is fixedly connected with one of the rotating rollers 11. A plurality of bleeder vent 121 has been seted up on the rotating band 12, all bleeder vents 121 arrange in proper order along the annular motion route of rotating band 12, the lateral surface fixedly connected with a plurality of rotating band 12 is used for promoting the impeller 122 that the corrugated paper removed, all impeller 122 are arranged along the direction of motion annular of rotating band 12, be provided with the dust absorption subassembly 2 that is used for clearing up the corrugated paper upper surface in the frame 1, be used for adsorbing the corrugated paper absorption subassembly 3 on rotating band 12, dust absorption subassembly 2 is located adsorption subassembly 3 directly over, adsorption subassembly 3 is located between the annular route of rotating band 12.

As shown in fig. 1 and 2, the dust collection assembly 2 includes a dust collection cover 21 extending along a horizontal direction, the extending direction of the dust collection cover 21 is the same as the width direction of the rotating belt 12, the dust collection cover 21 is connected to the frame 1 through the adjustment assembly 5, an opening of the dust collection cover 21 faces downward, an upper end of the dust collection cover 21 is connected to a dust collector 23 through a dust collection pipe 22, and the dust collector 23 is fixedly connected to the frame 1.

When the corrugated paper moved to the below of suction hood 21, the workman started dust catcher 23, and dust catcher 23 drives in wind and the dust suction hood 21 of corrugated paper upper surface, and the dust enters into in dust catcher 23 through suction hood 21 and dust absorption pipe 22 to the realization is to the clearance and the collection of dust, and then makes the dust be difficult for wafting and spills in the workshop, reduces the influence of dust to operational environment.

As shown in fig. 1 and 2, the adsorption assembly 3 includes an air draft cover 31, the air draft cover 31 is fixedly connected to the rack 1, an opening of the air draft cover 31 is vertically upward, the air draft cover 31 is horizontally disposed, an extending direction of the air draft cover 31 is the same as an extending direction of the dust suction cover 21, the air draft cover 31 is located right below the dust suction cover 21, the air draft cover 31 is located between the annular rotating belts 12, a lower end of the air draft cover 31 is fixedly connected with an air draft pipe 32 communicating with an inside of the air draft cover 31, one end of the air draft pipe 32 far away from the air draft cover 31 is fixedly connected with an air draft fan 33, and the air draft fan 33 is fixedly connected to the rack 1.

When the corrugated paper moves to the lower part of the dust hood 21, the opening of the air draft hood 31 corresponds to the corrugated paper, a worker starts the air draft fan 33, the air draft fan 33 drives the air above the rotating belt 12 to penetrate through the air holes 121 to enter the air draft hood 31, the air enters the air draft fan 33 through the air draft hood 31 and the air draft pipe 32, the air pressure between the corrugated paper and the rotating belt 12 is reduced, the corrugated paper is tightly adsorbed on the rotating belt 12, the adsorption force of the air draft hood 31 on the corrugated paper is far greater than that of the dust hood 21 on the corrugated paper, the corrugated paper is not easily separated from the rotating belt 12 in the cleaning process, and the stability of the corrugated paper is improved.

Meanwhile, the rotating belt 12 continues to rotate, and the pushing member 122 pushes the corrugated paper to move towards the feeding end 15 by abutting against the corrugated paper, so that the corrugated paper leaves between the dust hood 21 and the air draft cover 31.

As shown in fig. 2, the width of the suction hood 31 is greater than the width of the dust suction hood 21, and the cleaning range of the dust suction hood 21 is within the air suction range of the suction hood 31, so as to further improve the stability of the corrugated cardboard on the rotating belt 12.

As shown in fig. 2, the pushing member 122 is in the shape of a long strip plate, and the extending direction of the pushing member 122 is the same as the width direction of the rotating rod, so that the corrugated paper can be pushed stably.

As shown in fig. 1 and 3, a sliding groove 42 is formed in the lower end surface of the dust hood 21, an embedded block 41 is slidably embedded in the sliding groove 42, one end of the sliding groove 42 penetrates through the side wall of the dust hood 21, the embedded block 41 is dovetail-shaped, a lower end of the embedded block 41 is fixedly connected with a brush 4, the embedded block 41 and the brush 4 both extend along the length direction of the dust hood 21, and the brush 4 is located on one side of the dust hood 21 facing the feeding end 15.

When the corrugated paper moves to the lower part of the dust hood 21, the brush 4 is abutted to the upper surface of the corrugated paper, so that the dust with stronger adhesion to the upper surface of the corrugated paper is swept down, the dust swept by the brush 4 is absorbed by the dust hood 21, and the cleaning effect of the dust hood 21 on the corrugated paper is further improved.

When the workman need clear up brush 4, workman pulling brush 4, brush 4 drives and inlays that establish piece 41 and slide and wear out the notch with sliding tray 42 in sliding tray 42 for brush 4 and suction hood 21 separation, the workman aligns sliding tray 42 with brush 4 after the clearance again, will inlay and establish piece 41 and slide and peg graft in sliding tray 42, thereby made things convenient for the workman to clear up brush 4, further improved the clearance effect to the corrugated paper.

As shown in fig. 3 and 4, set up the groove 43 of wearing to run through in sliding tray 42 cell wall on the outer wall of suction hood 21, wear to establish groove 43 and extend along the horizontal direction, it has locating lever 44 to slide in the groove 43 to wear to peg graft, the axial of locating lever 44 and sliding tray 42's extending direction mutually perpendicular, inlay and establish and seted up locating hole 45 on the piece 41, when inlaying the piece 41 and pegging graft in sliding tray 42 completely, locating hole 45 and locating lever 44 are corresponding, the workman promotes locating lever 44 and makes it slide in wearing to establish groove 43, locating lever 44 inserts when locating hole 45, it is difficult for sliding in sliding tray 42 to inlay and establish piece 41, thereby the stability of brush 4 has been improved.

As shown in fig. 3 and 4, a spring 46 is fixedly sleeved on the positioning rod 44, one end of the spring 46 is fixedly connected to the positioning rod 44, and the other end of the spring 46 is fixedly connected to the outer wall of the dust hood 21. When the workman changes brush 4, workman pulling locating lever 44, make locating lever 44 sink into in the wearing groove 43 towards the one end of inlaying the piece 41, spring 46 takes place deformation, the workman stimulates brush 4 again and makes the separation of inlaying piece 41 and sliding tray 42, the workman inserts the piece 41 on the new brush 4 in the sliding tray 42, until locating hole 45 with wear to establish the groove 43 corresponding back, the workman loosens locating lever 44, spring 46 replies to natural state and promotes locating lever 44 and inserts in locating hole 45, the workman has made things convenient for the installation brush 4, and the stability of locating lever 44 has been improved.

As shown in fig. 3, the adjusting assembly 5 includes a screw rod 51 and a guide rod 52, which are vertically disposed, the guide rod 52 is fixedly connected to the frame 1, the screw rod 51 is rotatably connected to the frame 1, the screw rod 51 and the guide rod 52 are arranged along the width direction of the frame 1, both ends of the dust hood 21 are fixedly connected with a connecting block 54, the two refining blocks are respectively provided for the screw rod 51 to be connected with each other and the guide rod 52 to be inserted with each other in a sliding manner, one end of the screw rod 51 is coaxially and fixedly connected with a rotating handle 53, when the corrugated paper thickness of pay-off is different, the rotatory handle 53 that rotates of workman, it is rotatory around self axis to rotate handle 53 and drive lead screw 51, lead screw 51 and wherein remove connecting block 54 screw-thread fit, drive suction hood 21 and another connecting block 54 and slide on guide arm 52 and wear to establish, suction hood 21 removes along vertical direction this moment, contradict in the upper surface of corrugated paper until brush 4, makes things convenient for the workman to transport and clear up to the corrugated paper of different thickness.

The implementation principle of a corrugated paper feeding mechanism of the embodiment of the application is as follows: when the worker needs to transport the corrugated paper, firstly, the worker rotates the rotating handle 53 to drive the screw rod 51 to rotate around the axis of the screw rod 51, the screw rod 51 drives the dust hood 21 to move along the vertical direction, so that the brush 4 and the dust hood 21 are suitable for transporting the corrugated paper, the worker places the corrugated paper on the placing end 14 of the rotating belt 12, and one side of the corrugated paper, which is far away from the material feeding end 15, is abutted against the pushing piece 122.

Then, the worker starts the motor 13, the motor 13 drives the rotating roller 11 to rotate, so that the rotating belt 12 makes an annular motion, the rotating belt 12 conveys the corrugated paper to a position between the air draft cover 31 and the dust suction cover 21, the worker starts the exhaust fan 33, and the exhaust fan 33 drives the air to enter the exhaust fan 33 through the air vent 121, the air draft cover 31 and the air draft pipe 32 in sequence, so that the corrugated paper is adsorbed on the rotating belt 12.

Then, the corrugated paper passes through the brush 4, the brush 4 sweeps off dust attached to the corrugated paper, the worker starts the dust collector 23, the dust collector 23 drives air and dust to enter the dust collector 23 through the dust hood 21 and the dust collection pipe 22 in sequence, and the pushing piece 122 corresponding to the corrugated paper pushes the cleaned corrugated paper to leave between the air draft cover 31 and the dust hood 21 and convey the corrugated paper to the feeding end 15.

According to the action, the cleaning of dust is completed in the process of corrugated paper feeding, workers can clean and collect the corrugated paper conveniently, the dust is not easy to float in a workshop, the environment-friendly effect is achieved, and the influence of the dust on the working environment is reduced.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. The utility model provides a corrugated paper feeding mechanism, includes frame (1) that extends along the horizontal direction, it is connected with two live-rollers (11) to rotate in frame (1), two live-rollers (11) are arranged in proper order along the length direction of frame (1), the extending direction of the axial perpendicular to frame (1) of live-rollers (11), two the cover is equipped with same rolling strip (12) that are used for carrying the corrugated paper on live-rollers (11), be equipped with motor (13) on frame (1), the output shaft of motor (13) links to each other with one of them live-rollers (11) are coaxial, its characterized in that: the corrugated paper dust collector is characterized in that a plurality of air holes (121) are formed in the rotating belt (12), all the air holes (121) are sequentially arranged along the moving direction of the rotating belt (12), dust collection assemblies (2) used for cleaning the upper surface of corrugated paper and adsorption assemblies (3) adsorbing the corrugated paper on the rotating belt (12) are arranged on the rack (1), the dust collection assemblies (2) are located right above the adsorption assemblies (3), a conveying path of the rotating belt (12) penetrates through the dust collection assemblies (2) and the adsorption assemblies (3), a plurality of pushing pieces (122) used for pushing the corrugated paper to move are arranged on the rotating belt (12), and all the pushing pieces (122) are sequentially arranged along the moving direction of the rotating belt (12).

2. A corrugated paper feed mechanism as defined in claim 1, wherein: dust collection assembly (2) is including being suction hood (21) that the level set up, the opening orientation of suction hood (21) rotates area (12), suction hood (21) are connected in frame (1) and suction hood (21) and are located the top of rotating area (12), the width direction of frame (1) is followed in suction hood (21) extends, suction hood (21) are connected with dust catcher (23) through dust absorption pipe (22), dust catcher (23) are located frame (1).

3. A corrugated paper feed mechanism as defined in claim 1, wherein: adsorption component (3) include air draft housing (31), air draft housing (31) extend along the width direction of frame (1), air draft housing (31) are connected with air exhauster (33) through exhaust column (32), air exhauster (33) are located frame (1), air draft housing (31) are located between the annular route of rotation area (12), the opening of air draft housing (31) is towards dust absorption component (2).

4. A corrugated paper feed mechanism as defined in claim 2, wherein: the one end of rotating band (12) is for placing end (14) of placing the corrugated paper, one side that the end (14) was kept away from in suction hood (21) is equipped with brush (4) that are used for conflicting corrugated paper surface, the length direction of suction hood (21) is followed in brush (4) extends.

5. A corrugated paper feeding mechanism as claimed in claim 4, wherein: the dust hood (21) is provided with a sliding groove (42) extending along the length direction of the dust hood, one end of the sliding groove (42) penetrates through the outer wall of the dust hood (21), and the brush (4) is provided with an embedded block (41) inserted in the sliding groove (42) in a sliding mode.

6. A corrugated paper feeding mechanism as claimed in claim 5, wherein: the dust hood (21) is provided with a penetrating groove (43) communicated with the sliding groove (42) on the outer wall, a positioning rod (44) is inserted in the penetrating groove (43), the axial direction of the positioning rod (44) is perpendicular to the extending direction of the sliding groove (42), and a positioning hole (45) for inserting the positioning rod (44) is formed in the embedding block (41).

7. A corrugated paper feed mechanism as defined in claim 2, wherein: the dust hood (21) is provided with a spring (46) for promoting the positioning rod (44) to be inserted into the positioning hole (45), one end of the spring (46) is connected with the dust hood (21), and the other end of the spring (46) is connected with the positioning rod (44).

8. A corrugated paper feed mechanism as defined in claim 2, wherein: be equipped with on frame (1) and be used for adjusting adjustment suction hood (21) opening and adjustment subassembly (5) of rotating area (12) interval, adjustment subassembly (5) are including rotating lead screw (51) of connecting in frame (1), the axis perpendicular to of lead screw (51) rotates the face of taking (12) to be used for carrying the corrugated paper, lead screw (51) are trained the level with suction hood (21) screw thread, be equipped with guide arm (52) of wearing to locate suction hood (21) on frame (1), the axial of guide arm (52) is the same with the axial of lead screw (51).

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