CN111017766A - Component rotating device of steel structure building - Google Patents

Component rotating device of steel structure building Download PDF

Info

Publication number
CN111017766A
CN111017766A CN201911327111.2A CN201911327111A CN111017766A CN 111017766 A CN111017766 A CN 111017766A CN 201911327111 A CN201911327111 A CN 201911327111A CN 111017766 A CN111017766 A CN 111017766A
Authority
CN
China
Prior art keywords
wire rope
rotating device
bottom plate
steel
steel structure
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.)
Pending
Application number
CN201911327111.2A
Other languages
Chinese (zh)
Inventor
付逍
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.)
Shaanxi Borui Information Technology Co Ltd
Original Assignee
Shaanxi Borui Information 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 Shaanxi Borui Information Technology Co Ltd filed Critical Shaanxi Borui Information Technology Co Ltd
Priority to CN201911327111.2A priority Critical patent/CN111017766A/en
Publication of CN111017766A publication Critical patent/CN111017766A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66DCAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/02Driving gear
    • B66D1/14Power transmissions between power sources and drums or barrels
    • B66D1/20Chain, belt, or friction drives, e.g. incorporating sheaves of fixed or variable ratio
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66DCAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/28Other constructional details
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66DCAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/28Other constructional details
    • B66D1/40Control devices
    • B66D1/48Control devices automatic
    • B66D1/50Control devices automatic for maintaining predetermined rope, cable, or chain tension, e.g. in ropes or cables for towing craft, in chains for anchors; Warping or mooring winch-cable tension control
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16NLUBRICATING
    • F16N7/00Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated
    • F16N7/12Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated with feed by capillary action, e.g. by wicks
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66DCAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D2700/00Capstans, winches or hoists
    • B66D2700/01Winches, capstans or pivots
    • B66D2700/0183Details, e.g. winch drums, cooling, bearings, mounting, base structures, cable guiding or attachment of the cable to the drum

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Buildings Adapted To Withstand Abnormal External Influences (AREA)

Abstract

The invention discloses a component rotating device of a steel structure building, which belongs to the technical field of steel structure building equipment and comprises a bottom plate, wherein a support is arranged on the surface of the top of the bottom plate, a winding wheel is arranged at the top of the support, a motor is arranged at one end of the surface of the top of the bottom plate, a speed reducer is arranged on one side of the motor, a tensioning mechanism is arranged on one side of the surface of the top of the bottom plate, and the tensioning mechanism consists of a sleeve, an ejector rod, a damping spring shock absorber, a fixed frame and. The steel wire rope hoisting device has the advantages that the motor drives the winding wheel to run through the speed reducer, so that the steel wire rope can hoist a steel member, the conveying wheel can play a role in tensioning the steel wire rope through the tensioning mechanism, the phenomenon of winding caused by loosening of the steel wire rope can be prevented, the subsequent use safety of the device is improved, and lubricating oil can be added to sponge in the guide pipe through the funnel, so that the steel wire rope can be coated.

Description

Component rotating device of steel structure building
Technical Field
The invention relates to the technical field of steel structure building equipment, in particular to a component rotating device for a steel structure building.
Background
With the development of science and technology, steel structure buildings gradually replace reinforced concrete buildings in the building industry, steel in the steel structure buildings is high in strength and elastic modulus, and the ratio of the density to the yield strength of the steel structure buildings is relatively low compared with concrete and wood, so that the steel structure building is small in section, light in dead weight, convenient to transport and install and suitable for structures with large span, high height and load bearing capacity under the same stress condition, and the structural elements are structures with basic units of steel structures composed of parts or parts and components, such as steel structure beams, steel structure columns and supports.
The component rotating device of the existing steel structure building is used, and the steel wire is loosened to easily generate the winding phenomenon, so that the hoisting of a rear steel component is influenced, and meanwhile, the steel wire rope used by the component rotating device of the existing steel structure building is not enough in rust prevention and corrosion function, so that the service life of the steel wire rope is shortened. For this purpose, we propose a member rotating device for steel structure building.
Disclosure of Invention
The invention provides a component rotating device of a steel structure building, wherein a motor drives a winding wheel to operate through a speed reducer, so that a steel wire rope can hoist a steel component, a conveying wheel can play a function of tensioning the steel wire rope through a tensioning mechanism, the phenomenon of winding caused by loosening of the steel wire rope can be prevented, the subsequent use safety of equipment is improved, lubricating oil can be added onto sponge in a guide pipe through a funnel, and the steel wire rope can be coated.
The specific technical scheme provided by the invention is as follows:
the invention provides a component rotating device of a steel structure building, which comprises a bottom plate, wherein a support is arranged on the surface of the top of the bottom plate, a winding wheel is arranged at the top of the support, a motor is arranged at one end of the surface of the top of the bottom plate, a speed reducer is arranged on one side of the motor, a tensioning mechanism is arranged on one side of the surface of the top of the bottom plate, the tensioning mechanism consists of a sleeve, an ejector rod, a damping spring shock absorber, a fixing frame and a conveying wheel, an upright post is arranged on the left side of the tensioning mechanism, a guide pipe is arranged on the surface of the top of the upright post, a sponge is arranged in the.
Optionally, the speed reducer is connected with the upper shaft of the winding wheel through a chain in a transmission manner, and the input end of the speed reducer is connected with the output end of the motor through a rotating shaft.
Optionally, the ejector rod is inserted into the inner cavity of the sleeve, the damping spring absorber is mounted on the surface of the bottom of the inner cavity of the sleeve, and the damping spring absorber is located on the surface of the bottom of the ejector rod.
Optionally, a fixing frame is welded on the surface of the top of the ejector rod, and a conveying wheel is mounted on the surface of the fixing frame.
Optionally, both ends of the conduit are of a general structure.
Optionally, a driven wheel is mounted at the other end of the top surface of the bottom plate.
The invention has the following beneficial effects:
1. according to the invention, the motor is arranged at one end of the top surface of the bottom plate, the input end of the speed reducer is connected with the output end of the motor through the rotating shaft, and the speed reducer is in transmission connection with the upper rotating shaft of the winding wheel arranged at the top of the bracket through the chain, so that the winding wheel can be driven to run through the motor through the speed reducer, the steel wire rope can be wound, the steel member hung at the other end of the steel wire rope can be lifted, and the steel member can be rotatably arranged.
2. Because tensioning mechanism is installed to bottom plate top surface one side, and tensioning mechanism is by the sleeve pipe, the ejector pin, damping spring shock absorber, mount and delivery wheel are constituteed, thereby can make the delivery wheel withstand wire rope and rotate, because the delivery wheel passes through the mount and links to each other with the ejector pin top, and peg graft in the sleeve pipe in the ejector pin bottom, sleeve pipe inner chamber bottom surface mounting has damping spring shock absorber simultaneously, and damping spring shock absorber is located ejector pin bottom surface, thereby can make the delivery wheel can play carry out the function of tensioning to wire rope, and then can prevent the not hard up winding phenomenon that takes place of wire, the safety of the follow-up use of equipment has been improved.
3. Because the stand is installed in straining device left side, and stand top surface mounting has the pipe, the sponge is installed to the pipe inner chamber simultaneously, inlay the funnel of connecting and add lubricating oil through pipe top surface, thereby can make lubricating oil invade to the sponge of pipe inner chamber, make the sponge can paint the wire rope that passes through, can the lubrication action, can prevent again that wire rope from going up the rust corrosion, and then can improve wire rope's life, through the top cap, can prevent again that the foreign matter from blockking up the funnel, the safety in utilization of funnel has been improved, through from the driving wheel, the transmission of the wire rope that can be convenient for, so that wire rope's operation.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural view of a component rotating apparatus of a steel structure building according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a tensioning mechanism of a component rotating device of a steel structure building according to an embodiment of the invention;
fig. 3 is a schematic side view of a fixing frame of a component rotating device of a steel structure building according to an embodiment of the present invention;
fig. 4 is a schematic structural view of a top portion of a column of a component rotating device of a steel structure building according to an embodiment of the present invention.
In the figure: 1. a base plate; 2. a support; 3. a winding wheel; 4. a motor; 5. a speed reducer; 6. a tensioning mechanism; 601. a sleeve; 602. a top rod; 603. a damping spring shock absorber; 604. a fixed mount; 605. a delivery wheel; 7. a column; 8. a conduit; 9. a sponge; 10. a funnel; 11. a top cover; 12. a driven wheel.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A structure rotating apparatus for a steel structure building according to an embodiment of the present invention will be described in detail with reference to fig. 1 to 4.
Referring to fig. 1 to 4, the component rotating device for a steel structure building provided by the embodiment of the invention comprises a bottom plate 1, a support 2 is mounted on the top surface of the bottom plate 1, a winding wheel 3 is mounted on the top of the support 2, a motor 4 is mounted at one end of the top surface of the bottom plate 1, a speed reducer 5 is mounted on one side of the motor 4, a tensioning mechanism 6 is mounted on one side of the top surface of the bottom plate 1, the tensioning mechanism 6 is composed of a sleeve 601, a push rod 602, a damping spring shock absorber 603, a fixing frame 604 and a conveying wheel 605, an upright post 7 is mounted on the left side of the tensioning mechanism 6, a guide pipe 8 is mounted on the top surface of the upright post 7, a sponge 9 is mounted in the inner cavity of the guide pipe 8, a funnel 10 is. Wherein, drive the operation of rolling wheel 3 through motor 4 through speed reducer 5 to can make wire rope lift by crane the steel member, through straining device 6, can make delivery wheel 605 play and carry out the function of tensioning to wire rope, and then can prevent the not hard up winding phenomenon that takes place of wire rope, improve the safety of the follow-up use of equipment, through funnel 10, can add lubricating oil on sponge 9 in pipe 8, thereby can paint the processing to wire rope.
Referring to fig. 1, in the component rotating device for a steel structure building provided by the embodiment of the present invention, the speed reducer 5 is in transmission connection with the upper rotating shaft of the winding wheel 3 through a chain, and the input end of the speed reducer 5 is connected with the output end of the motor 4 through a rotating shaft. Wherein, through motor 4, can drive the operation of speed reducer 5 to can drive wind-up pulley 3 and rotate, and then can carry out the rolling to wire rope.
Referring to fig. 1 and 2, in the component rotating device for a steel structure building according to the embodiment of the present invention, a top rod 602 is inserted into an inner cavity of a sleeve 601, a damping spring absorber 603 is installed on a bottom surface of the inner cavity of the sleeve 601, and the damping spring absorber 603 is located on a bottom surface of the top rod 602. Wherein, the sleeve 601 can provide firm support for the mandril 602, and the damping spring shock absorber 603 can elastically contract the mandril 602 in the sleeve 601, so that the top conveying wheel 605 plays a role of tensioning the steel wire rope.
Referring to fig. 1 and 2, in the component rotating device for a steel structure building according to the embodiment of the present invention, a fixed frame 604 is welded to the top surface of the top rod 602, and a conveying wheel 605 is mounted on the surface of the fixed frame 604. Wherein, the fixed frame 604 can provide firm support for the conveying wheel 605, so that the conveying wheel 605 can convey the steel wire rope smoothly.
Referring to fig. 1 and 3, in the component rotating apparatus for a steel structure building according to an embodiment of the present invention, both ends of the guide pipe 8 are of a general structure. Wherein, because 8 both ends of pipe all lead to general formula structure to can be convenient for wire rope's penetration, and then can paint lubricating oil to wire rope.
Referring to fig. 1, in the component rotating device for a steel structure building according to the embodiment of the present invention, a driven wheel 12 is mounted at the other end of the top surface of a base plate 1. Wherein, through driven wheel 12, the transmission of wire rope that can be convenient for to wire rope's operation.
The embodiment of the invention provides a component rotating device of a steel structure building, wherein a motor 4 is arranged at one end of the top surface of a bottom plate 1, an input end of a speed reducer 5 is connected with an output end of the motor 4 through a rotating shaft, and the speed reducer 5 is in transmission connection with an upper rotating shaft of a winding wheel 3 arranged at the top of a support 2 through a chain, so that the winding wheel 3 is driven to operate through the motor 4 through the speed reducer 5, a steel wire rope can be wound, a steel component hung at the other end of the steel wire rope can be lifted, the steel component can be rotatably installed, a tensioning mechanism 6 is arranged at one side of the top surface of the bottom plate 1, the tensioning mechanism 6 is composed of a sleeve 601, a top rod 602, a damping spring shock absorber 603, a fixing frame 604 and a conveying wheel 605, so that the conveying wheel 605 can rotate against the steel wire rope, and, the bottom end of the ejector rod 602 is inserted into the sleeve 601, the damping spring shock absorber 603 is arranged on the surface of the bottom of the inner cavity of the sleeve 601, and the damping spring shock absorber 603 is arranged on the surface of the bottom of the ejector rod 602, so that the conveying wheel 605 can play a role in tensioning the steel wire rope, further the phenomenon of winding caused by the loosening of the steel wire can be prevented, the safety of subsequent use of equipment is improved, because the upright post 7 is arranged on the left side of the tensioning mechanism 6, the guide pipe 8 is arranged on the surface of the top of the upright post 7, the sponge 9 is arranged in the inner cavity of the guide pipe 8, lubricating oil is added through the funnel 10 embedded and connected with the surface of the top of the guide pipe 8, further the lubricating oil can invade into the sponge 9 in the inner cavity of the guide pipe 8, so that the sponge 9 can smear, through top cap 11, can prevent again that the foreign matter from blockking up funnel 10, improved the safety in utilization of funnel 10, through from driving wheel 12, the wire rope's that can be convenient for transmission to wire rope's operation.
It should be noted that the present invention is a component rotating device for a steel structure building, including a bottom plate 1, a bracket 2, a winding wheel 3, a motor 4 with a model number of Y132S-4, a speed reducer 5, a tensioning mechanism 6, a bushing 601, a top rod 602, a damping spring shock absorber 603, a fixing frame 604, a conveying wheel 605, an upright post 7, a conduit 8, a sponge 9, a funnel 10, a top cover 11, and a driven wheel 12, all of which are general standard components or components known to those skilled in the art, and the structure and principle of which can be known to those skilled in the art through technical manuals or through routine experimental methods, and the above electrical components are flexibly selected, installed and adjusted by those skilled in the art, so as to ensure that each device can normally operate, and no excessive restriction requirements are made here.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.

Claims (6)

1. The component rotating device of the steel structure building comprises a bottom plate (1) and is characterized in that a support (2) is installed on the surface of the top of the bottom plate (1), a winding wheel (3) is installed at the top of the support (2), a motor (4) is installed at one end of the surface of the top of the bottom plate (1), a speed reducer (5) is installed on one side of the motor (4), a tensioning mechanism (6) is installed on one side of the surface of the top of the bottom plate (1), the tensioning mechanism (6) is composed of a sleeve (601), an ejector rod (602), a damping spring shock absorber (603), a fixing frame (604) and a conveying wheel (605), an upright post (7) is installed on the left side of the tensioning mechanism (6), a guide pipe (8) is installed on the surface of the top of the upright post (7), sponge (9) is installed in the inner, a top cover (11) is installed on the top surface of the funnel (10).
2. The component rotating device of the steel structure building as claimed in claim 1, wherein the speed reducer (5) is in transmission connection with the upper rotating shaft of the winding wheel (3) through a chain, and the input end of the speed reducer (5) is connected with the output end of the motor (4) through a rotating shaft.
3. The structural member rotating device of the steel structural building as claimed in claim 1, wherein a top rod (602) is inserted into the inner cavity of the sleeve (601), a damping spring absorber (603) is mounted on the bottom surface of the inner cavity of the sleeve (601), and the damping spring absorber (603) is located on the bottom surface of the top rod (602).
4. The structural member rotating device of a steel structure building as claimed in claim 1, wherein a fixed frame (604) is welded on the top surface of the top rod (602), and a conveying wheel (605) is installed on the surface of the fixed frame (604).
5. The structural member rotating device of a steel structural building as claimed in claim 1, wherein both ends of the guide pipe (8) are of a general structure.
6. A structural member rotating device for steel structural buildings according to claim 1, wherein the other end of the top surface of the base plate (1) is provided with a driven wheel (12).
CN201911327111.2A 2019-12-20 2019-12-20 Component rotating device of steel structure building Pending CN111017766A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911327111.2A CN111017766A (en) 2019-12-20 2019-12-20 Component rotating device of steel structure building

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911327111.2A CN111017766A (en) 2019-12-20 2019-12-20 Component rotating device of steel structure building

Publications (1)

Publication Number Publication Date
CN111017766A true CN111017766A (en) 2020-04-17

Family

ID=70212745

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911327111.2A Pending CN111017766A (en) 2019-12-20 2019-12-20 Component rotating device of steel structure building

Country Status (1)

Country Link
CN (1) CN111017766A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111977491A (en) * 2020-07-06 2020-11-24 湖州和通电梯部件有限公司 Movable steel wire rope adjusting device for processing elevator components

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130060788A (en) * 2011-11-30 2013-06-10 주식회사 포스코 Guiding apparatus for winding wire-rope
CN103896173A (en) * 2014-04-04 2014-07-02 中联重科股份有限公司 Hoisting mechanism and speed regulation device thereof and crane
CN207606050U (en) * 2017-11-24 2018-07-13 江苏新汇力金属制品有限公司 A kind of maintaining steel wire rope equipment with decontamination plant
CN208327220U (en) * 2018-06-28 2019-01-04 吴书宝 Underground winch cable decontaminates care device
CN208327215U (en) * 2018-05-22 2019-01-04 车新宁 A kind of belt feeder tension winch
CN209210102U (en) * 2018-12-13 2019-08-06 山西朗坤电气科技有限公司 Electrical outdoor cable draw off gear
CN209774296U (en) * 2019-03-27 2019-12-13 洛阳博宣铸造有限公司 Steel cable winding structure with cleaning and rust preventing functions for double-beam crane

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130060788A (en) * 2011-11-30 2013-06-10 주식회사 포스코 Guiding apparatus for winding wire-rope
CN103896173A (en) * 2014-04-04 2014-07-02 中联重科股份有限公司 Hoisting mechanism and speed regulation device thereof and crane
CN207606050U (en) * 2017-11-24 2018-07-13 江苏新汇力金属制品有限公司 A kind of maintaining steel wire rope equipment with decontamination plant
CN208327215U (en) * 2018-05-22 2019-01-04 车新宁 A kind of belt feeder tension winch
CN208327220U (en) * 2018-06-28 2019-01-04 吴书宝 Underground winch cable decontaminates care device
CN209210102U (en) * 2018-12-13 2019-08-06 山西朗坤电气科技有限公司 Electrical outdoor cable draw off gear
CN209774296U (en) * 2019-03-27 2019-12-13 洛阳博宣铸造有限公司 Steel cable winding structure with cleaning and rust preventing functions for double-beam crane

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111977491A (en) * 2020-07-06 2020-11-24 湖州和通电梯部件有限公司 Movable steel wire rope adjusting device for processing elevator components

Similar Documents

Publication Publication Date Title
CN101539478B (en) Tester for testing multifunctional vane
CN101863422A (en) Rubber-tyred gantry crane with suspension crane and construction method thereof
CN111017766A (en) Component rotating device of steel structure building
CN101049892B (en) Method for matching balanced system of crane in type of arm support and crane therefor
CN103644084A (en) Phased-lifting method
CN105236249A (en) Elevator without machine room
CN201397252Y (en) Multifunctional blade testing desk
CN209903548U (en) Tubular pile prestress tensioning machine
CN101260796A (en) Underground balancing drum long stroke pumping unit
CN110562865B (en) Balanced heavy ladder adjusting device of cantilever crane balanced system
CN107339502A (en) A kind of fall arrest hanging apparatus for pipe laying
CN103539020A (en) Novel hoisting construction method and special hanging device
CN2057658U (en) Self-lifting type crane
CN102003162A (en) Simple W-shaped traction pumping unit
CN105970959A (en) Pile driver special for building
CN207330042U (en) A kind of lift compensation chain guiding device structure
JP2011195309A (en) Method for renewal of hydraulic elevator and rope elevator renewed by the method
CN205934920U (en) Construct dedicated pile driver
CN201193512Y (en) Long stroke beam-pumping unit with underground balancing drum
CN205099168U (en) Elevator without engine room
CN213011671U (en) Lightweight simple vertical transportation equipment
CN201610744U (en) Simple dragging oil pumping machine
CN220845032U (en) Elevator antiskid keeps off rope pole
CN219117035U (en) Cargo lifting tower capable of walking
CN2189145Y (en) Climbing wall type crane

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20200417