CN217316149U - Titanium plate hot coil box flying shear protection device - Google Patents

Titanium plate hot coil box flying shear protection device Download PDF

Info

Publication number
CN217316149U
CN217316149U CN202221090724.6U CN202221090724U CN217316149U CN 217316149 U CN217316149 U CN 217316149U CN 202221090724 U CN202221090724 U CN 202221090724U CN 217316149 U CN217316149 U CN 217316149U
Authority
CN
China
Prior art keywords
roller
flying shear
box
supporting
plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202221090724.6U
Other languages
Chinese (zh)
Inventor
刘龙祥
王德胜
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shandong Shengyang Metal Technology Co Ltd
Original Assignee
Shandong Shengyang Metal Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shandong Shengyang Metal Technology Co Ltd filed Critical Shandong Shengyang Metal Technology Co Ltd
Priority to CN202221090724.6U priority Critical patent/CN217316149U/en
Application granted granted Critical
Publication of CN217316149U publication Critical patent/CN217316149U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Landscapes

  • Shearing Machines (AREA)

Abstract

The utility model discloses a titanium plate hot coil box flying shear protection device, which comprises a hot coil box, a flying shear box, a clapboard, a guide mechanism, a pressing mechanism and a flying shear mechanism; the hot coil box and the flying shear box are separated by the partition plate; the guide mechanism, the pressing mechanism and the flying shear mechanism are all positioned in the flying shear box, and the guide mechanism and the flying shear mechanism are respectively positioned on two sides of the pressing mechanism; the supporting roll and the moving roll are respectively positioned at two sides of the flying shear mechanism, and the supporting roll is positioned below the pressing mechanism; an upper bending roller, a lower bending roller, a forming roller, a supporting seat, an uncoiling arm and a conveying roller are arranged in the hot coiling box; the upper bending roll is provided with a pair of rollers which are positioned above the lower bending roll; the forming roll is positioned obliquely below the lower bending roll; the pair of winding supporting rollers are arranged and are positioned on one side of the forming roller, and the conveying roller is positioned on one side of the partition plate; the supporting seat is positioned at the top of the hot coil box, and one end of the uncoiling arm is connected to the supporting plate. The utility model can protect the flying shears from being damaged; can prevent the titanium plate from deviating during cutting.

Description

Titanium plate hot coil box flying shear protection device
Technical Field
The utility model belongs to the technical field of the coil box flying shear, in particular to titanium plate coil box flying shear protection device.
Background
The hot coil box is equipment used for coiling and uncoiling an intermediate blank in a modern plate strip steel rolling process, and the flying shear mainly plays a role in shearing irregular head and tail of a titanium plate after rough rolling; however, the conventional flying shear protection device for the coil box has the following disadvantages:
1) the flying shears for the flying shears are exposed outside at ordinary times, and are not protected by a protective cover, so that the cutting edge of the flying shears is easily damaged, and the cutting of the titanium plate is influenced; or the protective cover is arranged, but the automatic adjustment cannot be carried out, so that the cutting is carried out after the protective cover is disassembled by workers, time and labor are wasted, and the cutting edge of the flying scissors is easy to be damaged when the protective cover is disassembled;
2) when traditional device cut, lack hold-down mechanism, titanium plate produced the skew when leading to cutting, and blunt sword easily bumps bad cutting edge that flies the scissors when cutting.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art and provide a titanium plate hot rolling box flying shear protection device which can protect flying shears from being damaged and the protection cover does not need to be disassembled to save time and labor; can prevent the titanium plate from deviating during cutting.
In order to realize the purpose, the utility model discloses a technical scheme is:
a titanium plate hot coiling box flying shear protection device comprises a hot coiling box, a flying shear box, a partition plate, a guide mechanism, a pressing mechanism, a flying shear mechanism, a supporting roller and a moving roller; an upper bending roller, a lower bending roller, a forming roller, a winding supporting roller, a supporting seat, an uncoiling arm and a conveying roller are arranged in the hot coiling box; the upper bending roll, the lower bending roll, the forming roll, the roll supporting roll and the conveying roll are all connected to the inner side wall of the hot rolling box through bearings; the upper bending roll is provided with a pair of rollers which are positioned above the lower bending roll; the forming roll is positioned obliquely below the lower bending roll; the pair of winding supporting rollers are positioned on one side of the forming roller, and the conveying roller is positioned on one side of the partition plate; the supporting seat is positioned at the top of the hot coil box, one end of the uncoiling arm is connected to the supporting plate through a connecting rod, one side of the connecting rod is provided with a motor, and the other end of the connecting rod is provided with an uncoiling shovel; motors are arranged on one sides of the upper bending roller, the lower bending roller, the forming roller, the winding supporting roller, the conveying roller, the supporting roller and the moving roller.
The clapboard separates the coil box from the flying shear box; the guide mechanism, the pressing mechanism and the flying shear mechanism are all positioned in the flying shear box, and the guide mechanism and the flying shear mechanism are respectively positioned on two sides of the pressing mechanism; the supporting roll and the moving roll are respectively positioned at two sides of the flying shear mechanism, and the supporting roll is positioned below the pressing mechanism;
the flying shear mechanism comprises a support frame, a fixing plate, a cylinder, a tool rest, flying shears, a protective cover, a cross beam and a waste collecting box; the support frame is fixed in the flying shear box, and a movable groove is arranged on the side wall of the support frame; two ends of the fixed plate are respectively fixed on two side walls of the support frame; the pair of cylinders are arranged and are both arranged on the fixed plate; the output end of the cylinder is provided with a knife rest, and the bottom of the knife rest is provided with a flying shear; the protective cover is arranged on the knife rest, a spring and a guide rod are arranged on the protective cover, one end of the spring is connected to the knife rest, one end of the guide rod penetrates through the top end of the knife rest, and two ends of the protective cover are located in movable grooves in the side wall of the support frame; two ends of the cross beam are respectively fixed on the side walls of the support frame, and the cross beam is provided with a flying shear groove; the waste collecting box is positioned below the cross beam.
The guide mechanism comprises an upper guide roller, a lower guide roller, a support plate, a side guide roller and a guide plate; the upper guide roll and the lower guide roll are both connected to the flying shear box through bearings, and one side of the lower guide roll is provided with a motor; the two ends of the supporting plate are fixed on the side wall of the flying shear box, the guide plate is provided with a pair of supporting plates which are respectively positioned on the two sides of the titanium plate, the feeding end of the guide plate is in a horn shape, the guide plate is provided with a groove, and the groove is internally provided with a plurality of side guide rollers.
The pressing mechanism comprises a pressing roller, a supporting arm, a pressing spring, a movable plate and a mounting rod; the pair of supporting arms are symmetrically fixed on the side wall of the flying shear box, one end of each supporting arm, which is far away from the side wall of the flying shear box, is provided with a mounting groove, and two sides of each supporting arm are provided with limiting holes; the movable plate is positioned in the mounting groove, and two ends of the movable plate penetrate through the limiting holes; the compression spring is arranged in the mounting groove, one end of the compression spring is connected to the supporting arm, and the other end of the compression spring is connected to the movable plate; the mounting rod is fixed on the movable plate, and one end of the mounting rod penetrates through the spring and the top end of the supporting arm; the other end is provided with a bearing seat; the compressing roller is rotatably connected to the bearing seat.
Compared with the prior art, the utility model beneficial effect shows:
1) the titanium plate entering the flying shear box is conveyed to the flying shear mechanism through the guide mechanism and the pressing mechanism, the cylinder drives the knife rest, the flying shears and the protective cover to move downwards along the support frame, when the bottom of the protective cover is contacted with the bottom of the support frame, the protective cover is fixed, the knife rest drives the flying shears to move, the spring is stretched, the flying shears move out through an opening in the bottom of the protective cover, so that the titanium plate is cut, the cut irregular titanium plate falls into the waste collection box, then the cylinder drives the knife rest and the flying shears to move upwards, when the protective cover is far away from the support frame, the spring restores to drive the protective cover to move, the flying shears enter the protective cover, and the flying shears are prevented from being damaged;
2) when the titanium plate passes through the pressing mechanism, the pressing spring drives the movable plate, the mounting rod and the pressing roller to move along the limiting hole, so that the pressing roller presses the titanium plate, and the titanium plate is prevented from deviating when the flying shears cut.
Drawings
FIG. 1 is a schematic structural view I of a flying shear protection device for a titanium plate hot coiling box of the utility model;
FIG. 2 is a schematic structural view of a titanium plate hot coil box flying shear protection device of the present invention;
FIG. 3 is a schematic view of the internal structure of the flying shear protection device for titanium plate hot coiling box of the present invention;
FIG. 4 is a schematic structural view of a guide mechanism in the flying shear protection device for the titanium plate hot coiling box of the present invention;
FIG. 5 is a schematic structural view of a pressing mechanism in the flying shear protection device for titanium plate hot coiling boxes of the present invention;
FIG. 6 is a schematic structural view of a flying shear mechanism in the titanium plate hot coiling box flying shear protection device of the present invention;
FIG. 7 is a schematic cross-sectional view of a flying shear mechanism in the flying shear protection device for titanium plate hot coil boxes of the present invention;
in the figure: 1. a coil box; 101. an upper bending roll; 102. a lower bending roll; 103. a forming roll; 104. a supporting roller; 105. a supporting seat; 106. an uncoiling arm; 1061. uncoiling and shoveling; 107. a conveying roller; 2. a flying shear box; 3. a titanium plate; 4. a partition plate; 5. a guide mechanism; 501. an upper guide roller; 502. a lower guide roller; 503. a support plate; 504. a guide plate; 5041. a groove; 505. a side guide roller; 6. a hold-down mechanism; 601. a pressure roller; 602. a support arm; 6021. mounting grooves; 6022. a limiting hole; 603. a compression spring; 604. a movable plate; 605. mounting a rod; 6051. a bearing seat; 7. a flying shear mechanism; 701. a support frame; 7011. a movable groove; 702. a fixing plate; 703. a cylinder; 704. a tool holder; 7041. flying shears; 705. a protective cover; 7051. a spring; 7052. a guide bar; 706. a cross beam; 7061. a flying shear groove; 707. a waste collection tank; 8. a support roller; 9. the roller is moved.
Detailed Description
For the convenience of understanding of those skilled in the art, the technical solution of the present invention will be further specifically described with reference to fig. 1 to 7.
A titanium plate hot coiling box flying shear protection device comprises a hot coiling box 1, a flying shear box 2, a partition plate 4, a guide mechanism 5, a pressing mechanism 6, a flying shear mechanism 7, a supporting roller 8 and a moving roller 9; an upper bending roller 101, a lower bending roller 102, a forming roller 103, a supporting roller 104, a supporting seat 105, an uncoiling arm 106 and a conveying roller 107 are arranged in the hot coiling box 1; the upper bending roll 101, the lower bending roll 102, the forming roll 103, the backing roll 104 and the conveying roll 107 are connected to the inner side wall of the hot coiling box 1 through bearings; the upper bending roll 101 is provided with a pair of rollers positioned above the lower bending roll 102; the forming roll 103 is located obliquely below the lower bending roll 102; a pair of the supporting rollers 104 are arranged and are positioned at one side of the forming roller 103, and the conveying roller 107 is positioned at one side of the partition plate 4; the supporting seat 105 is positioned at the top of the hot coiling box 1, one end of the uncoiling arm 106 is connected to the supporting seat 105 through a connecting rod, one side of the connecting rod is provided with a motor, and the other end of the connecting rod is provided with an uncoiling shovel 1061; motors are arranged on one sides of the upper bending roller 101, the lower bending roller 102, the forming roller 103, the backing roller 104, the conveying roller 107, the supporting roller 8 and the moving roller 9.
The clapboard 4 separates the coil box 1 from the flying shear box 2; the guide mechanism 5, the pressing mechanism 6 and the flying shear mechanism 7 are all positioned in the flying shear box 2, and the guide mechanism 5 and the flying shear mechanism 7 are respectively positioned at two sides of the pressing mechanism 6; the supporting roller 8 and the moving roller are respectively positioned at two sides of the flying shear mechanism 7, and the supporting roller 8 is positioned below the pressing mechanism 6.
The flying shear mechanism 7 comprises a support frame 701, a fixing plate 702, an air cylinder 703, a tool rest 704, a flying shear 7041, a protective cover 705, a cross beam 706 and a waste collection box 707; the support frame 701 is fixed in the flying shear box 2, and a movable groove 7011 is formed in the side wall of the support frame 701; two ends of the fixing plate 702 are respectively fixed on two side walls of the support frame 701; a pair of air cylinders 703 are arranged and are both arranged on the fixed plate 702; the output end of the cylinder 703 is provided with a cutter rest 704, and the bottom of the cutter rest 704 is provided with a flying shear 7041; the protective cover 705 is arranged on the tool rest 704, a spring 7051 and a guide rod 7052 are arranged on the protective cover 705, one end of the spring 7051 is connected to the tool rest 704, one end of the guide rod 7052 penetrates through the top end of the tool rest 704, and two ends of the protective cover 705 are positioned in movable grooves 7011 on the side wall of the support frame 701; two ends of a cross beam 706 are respectively fixed on the side walls of the support frame 701, and a flying shear groove 7061 is formed in the cross beam 706; a waste collection box 707 is located below the cross beam 706.
The guide mechanism 5 comprises an upper guide roller 501, a lower guide roller 502, a support plate 503, a side guide roller 505 and a guide plate 504; the upper guide roll 501 and the lower guide roll 502 are both connected to the flying shear box 2 through bearings, and one side of the lower guide roll 502 is provided with a motor; two ends of a supporting plate 503 are fixed on the side wall of the flying shear box 2, a pair of supporting plates 503 which are respectively positioned on two sides of a titanium plate are arranged on a guide plate 504, the feeding end of the guide plate 504 is in a horn shape, a groove 5041 is arranged on the guide plate 504, and a plurality of side guide rollers 505 are arranged in the groove 5041;
the pressing mechanism 6 comprises a pressing roller 601, a supporting arm 602, a pressing spring 603, a movable plate 604 and a mounting rod 605; the support arms 602 are provided with a pair of support arms and symmetrically fixed on the side wall of the flying shear box 2, one end of the support arm 602, which is far away from the side wall of the flying shear box 2, is provided with a mounting groove 6021, and two sides are provided with limit holes 6022; the movable plate 604 is positioned in the mounting groove 6021, and two ends of the movable plate 604 pass through the limiting holes 6022; the compression spring 603 is arranged in the mounting groove 6021, one end of the compression spring is connected to the supporting arm 602, and the other end of the compression spring is connected to the movable plate 604; a mounting rod 605 is fixed on the movable plate 604, and one end of the mounting rod 605 passes through the top ends of the pressing spring 603 and the supporting arm 602; the other end is provided with a bearing seat 6051; the pinch roller 601 is rotatably coupled to a bearing housing 6051.
A titanium plate hot coil box flying shear protection device comprises the following working processes: after the titanium plate 3 enters the hot coiling box 1, the titanium plate 3 is coiled under the action of an upper bending roller 101, a lower bending roller 102, a forming roller 103 and a coil supporting roller 104, the coiled titanium plate 3 is uncoiled under the action of an uncoiling arm 106, and then the coiled titanium plate is conveyed into the flying shear box 2 through a conveying roller 107; the titanium plate 3 entering the flying shear box 2 is conveyed to a flying shear mechanism 7 through a guide mechanism 5 and a pressing mechanism 6, an air cylinder 703 drives a cutter frame 704, a flying shear 7041 and a protective cover 705 to move downwards along a support frame 701, when the bottom of the protective cover 705 contacts the bottom of the support frame 701, the protective cover 705 is fixed, the cutter frame 704 drives the flying shear 7041 to move, a spring 7051 is stretched, the flying shear 7041 moves out through an opening in the bottom of the protective cover 705, so that the titanium plate 3 is cut, the cut irregular titanium plate 3 falls into a waste collection box 707, and the rest of the titanium plate 3 is conveyed by a moving roller 9; then the cylinder 703 drives the tool rest 704 and the flying shear 7041 to move upwards, and when the protective cover 705 is far away from the support frame 701, the spring 7051 restores to drive the protective cover 705 to move, so that the flying shear 7041 enters the protective cover 705, and the flying shear 7041 is prevented from being damaged; when the titanium plate 3 passes through the pressing mechanism 6, the pressing spring 603 drives the movable plate 604, the mounting rod 605 and the pressing roller 601 to move along the limiting hole 6022, so that the pressing roller 601 presses the titanium plate 3, and the titanium plate 3 is prevented from deviating when the flying shears 7041 cuts.
The foregoing is merely exemplary and illustrative of the structure of the invention, and various modifications, additions and substitutions as described in the detailed description may be made by those skilled in the art without departing from the structure or exceeding the scope of the invention as defined in the claims.

Claims (3)

1. A titanium plate hot coiling box flying shear protection device comprises a hot coiling box, a flying shear box, a partition plate, a guide mechanism, a pressing mechanism, a flying shear mechanism, a supporting roller and a moving roller; an upper bending roller, a lower bending roller, a forming roller, a supporting seat, an uncoiling arm and a conveying roller are arranged in the hot coiling box; the upper bending roll, the lower bending roll, the forming roll, the roll supporting roll and the conveying roll are all connected to the inner side wall of the hot rolling box through bearings; the upper bending roll is provided with a pair of rollers which are positioned above the lower bending roll; the forming roll is positioned obliquely below the lower bending roll; the pair of winding supporting rollers are arranged and are positioned on one side of the forming roller, and the conveying roller is positioned on one side of the partition plate; the supporting seat is positioned at the top of the hot coil box, one end of the uncoiling arm is connected to the supporting plate through a connecting rod, one side of the connecting rod is provided with a motor, and the other end of the connecting rod is provided with an uncoiling shovel; motors are arranged on one sides of the upper bending roller, the lower bending roller, the forming roller, the winding supporting roller, the conveying roller, the supporting roller and the moving roller;
the device is characterized in that the hot coil box and the flying shear box are separated by a partition plate; the guide mechanism, the pressing mechanism and the flying shear mechanism are all positioned in the flying shear box, and the guide mechanism and the flying shear mechanism are respectively positioned on two sides of the pressing mechanism; the supporting roll and the moving roll are respectively positioned at two sides of the flying shear mechanism, and the supporting roll is positioned below the pressing mechanism; the flying shear mechanism comprises a support frame, a fixed plate, a cylinder, a tool rest, flying shears, a protective cover, a cross beam and a waste collecting box; the support frame is fixed in the flying shear box, and the side wall of the support frame is provided with a movable groove; two ends of the fixed plate are respectively fixed on two side walls of the support frame; the pair of cylinders are arranged and are both arranged on the fixed plate; the output end of the cylinder is provided with a knife rest, and the bottom of the knife rest is provided with a flying shear; the protective cover is arranged on the knife rest, a spring and a guide rod are arranged on the protective cover, one end of the spring is connected to the knife rest, one end of the guide rod penetrates through the top end of the knife rest, and two ends of the protective cover are located in movable grooves in the side wall of the support frame; two ends of the cross beam are respectively fixed on the side walls of the support frame, and the cross beam is provided with a flying shear groove; the waste collecting box is positioned below the cross beam.
2. The titanium plate hot coiling box flying shear protection device of claim 1, wherein the guide mechanism comprises an upper guide roller, a lower guide roller, a support plate, a side guide roller and a guide plate; the upper guide roller and the lower guide roller are both connected to the flying shear box through bearings, and one side of the lower guide roller is provided with a motor; the two ends of the supporting plate are fixed on the side wall of the flying shear box, the guide plate is provided with a pair of supporting plates which are respectively positioned on the two sides of the titanium plate, the feeding end of the guide plate is in a horn shape, the guide plate is provided with a groove, and the groove is internally provided with a plurality of side guide rollers.
3. The titanium plate hot coiling box flying shear protection device of claim 1, wherein the pressing mechanism comprises a pressing roller, a supporting arm, a pressing spring, a movable plate and a mounting rod; the pair of supporting arms are symmetrically fixed on the side wall of the flying shear box, one end of each supporting arm, which is far away from the side wall of the flying shear box, is provided with a mounting groove, and two sides of each supporting arm are provided with limiting holes; the movable plate is positioned in the mounting groove, and two ends of the movable plate penetrate through the limiting holes; the compression spring is arranged in the mounting groove, one end of the compression spring is connected to the supporting arm, and the other end of the compression spring is connected to the movable plate; the mounting rod is fixed on the movable plate, and one end of the mounting rod penetrates through the spring and the top end of the supporting arm; the other end is provided with a bearing seat; the compressing roller is rotatably connected to the bearing seat.
CN202221090724.6U 2022-05-09 2022-05-09 Titanium plate hot coil box flying shear protection device Active CN217316149U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202221090724.6U CN217316149U (en) 2022-05-09 2022-05-09 Titanium plate hot coil box flying shear protection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202221090724.6U CN217316149U (en) 2022-05-09 2022-05-09 Titanium plate hot coil box flying shear protection device

Publications (1)

Publication Number Publication Date
CN217316149U true CN217316149U (en) 2022-08-30

Family

ID=82951632

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202221090724.6U Active CN217316149U (en) 2022-05-09 2022-05-09 Titanium plate hot coil box flying shear protection device

Country Status (1)

Country Link
CN (1) CN217316149U (en)

Similar Documents

Publication Publication Date Title
CN107381177B (en) Divide to roll up side cut device
CN202952046U (en) Punching and cutting production line for supporting plate of solar water heater
CN111037368B (en) Automatic production line for rolling profiles
CN217316149U (en) Titanium plate hot coil box flying shear protection device
CN115213700A (en) Fixed-size transverse tangent suitable for small-batch production
CN113106734A (en) Towel cutting forming device
CN217223792U (en) High-efficient automatic guillootine of lithium-ion battery pole piece
CN214556604U (en) Automatic cutting device for channel steel feeding
CN212498198U (en) Numerical control bamboo breaking machine
CN212599255U (en) Cold-rolled steel sheet plate shearing machine with automatic feeding
CN210061237U (en) Vertical cut-off knife device for automatic cutting of winding and unwinding of printing machine
CN207724674U (en) A kind of lithium battery diaphragm trimming device
CN219093865U (en) High-quality edge trimmer for pickling steel coil
CN217726971U (en) Abrasive wire pre-cutting mechanism
CN218465166U (en) Offcut recovery device of battery insulation sheet
CN218319753U (en) Cutting machine rolling station cutters
CN212797525U (en) High-speed film cutting mechanism of plate wrapping machine
CN209174985U (en) Cross cut shears for silicon steel sheet moulding process
CN214263232U (en) High-precision steel rolling material cutting device
CN211590215U (en) Device is decided to protection film
CN217253211U (en) Metal divides strip machine with divide apart from regulation and control
CN217675935U (en) Belt coiling machine with automatic shearing function
CN216828861U (en) Nuclear power steel pipe bar cutting machine
CN214321982U (en) Plate shearing machine for machining sheet metal parts
CN212597928U (en) Device for removing residual band tail of transverse cutting shear of uncoiler

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant