CN201473262U

CN201473262U - Large-tonnage screw jack

Info

Publication number: CN201473262U
Application number: CN2009203035952U
Authority: CN
Inventors: 俞庆中
Original assignee: HANGZHOU SHUANGLI MACHINERY CO Ltd
Current assignee: HANGZHOU SHUANGLI MACHINERY CO Ltd
Priority date: 2009-05-25
Filing date: 2009-05-25
Publication date: 2010-05-19
Anticipated expiration: 2019-05-25

Abstract

The utility model relates to a hoisting tool, in particular to a large-tonnage screw jack. In the prior art, the torsion moment of external operation can be increased greatly if a screw is used for transmission; the peripheral size can be greatly increased if the transmission ratio is increased; and the turning technique that is generally used can not meet the requirement of high accuracy and high surface roughness of a worm is adopted, so that it is adverse to prolong the service life of worms and worm wheels. The large-tonnage screw jack mainly solves the above problems in the prior art. The large-tonnage screw jack comprises a chassis, a main body connected with the chassis, and a hoisting screw rod arranged in the main body, wherein the hoisting screw rod is in threaded connection with a nut and a nut sleeve; and a top cover is connected with the top of the nut sleeve. The large-tonnage screw jack is characterized in that the lower end of the hoisting screw rod is connected with an integrally cast worm wheel through a key pin; the integrally cast worm wheel is meshed with a worm; and the worm is connected with one or two rockers through a transmitting device.

Description

The large-tonnage lifting screw

Technical field

The utility model relates to a kind of lifting gear, especially relates to a kind of to the isostructural improvement of large-tonnage lifting screw.

Background technology

Lifting screw is applicable to that railway, car inspection and maintenance, mine, building engineering support and the usefulness of general weight declines, because carrying convenience, maintenance are simple and easy, safe and reliable, it is strong to be widely used in flowing power, the large-tonnage hoisting operation.Chinese patent discloses a kind of lifting screw (Granted publication number: CN 2077862U), its structure is: at upper opening, in the tubular shell of bottom band base, leading screw axially is housed, a leading screw bottom cover one and a gear that is fastenedly connected in vain, be with on the leading screw on gear top and leading screw ingear lift nut parts, this parts top is equipped with the top platform, link by bearing between gear bottom and the base. face toward on the annulus position of gear teeth at tubular shell, have the thumb wheel hole, its outside be with one with the circular thumb wheel sheath body of shell bearing fit, pull out on the wheel sheath body and establish a pusher dog tube with respect to the position in thumb wheel hole, adorn one in the tube and be equipped with the pusher dog spring, can prolong gear radial expansion and pusher dog that can only unidirectional handsetting gear, on thumb wheel sheath body lateral wall, be provided with handle, removably handle bar is housed on the handle; The lift nut parts by with leading screw ingear nut be enclosed within that cover friction tight with it is simple on the nut forms, nut is in leading screw when the next, upper cartridge is suitable for reading concordant with housing, the cover letter top platform that is equipped with suitable for reading, overlap simple side-wall shaft to having sliding tray, the screw bear end that is fixed on the housing stretches in this groove, can only unidirectional handsetting gear the pusher dog front portion be a cylinder that can in pusher dog letter chamber, slide, the first side of the pusher dog of cylinder front portion is the plane with axially parallel.Opposite side is and the inclined-plane that axially is 40～70 degree angles; The pusher dog hole that the pusher dog head passes on the housing extend between the teeth of gear, cylindrical rear portion is the pusher dog bar, the pusher dog lid flush fit of its afterbody and pusher dog nozzle portion, the pusher dog spring is housed on the pusher dog bar, one on spring is stuck in the step place of pusher dog nozzle, the other end is stuck in the step place of cylinder and pusher dog bar boundary, the concrete structure of pusher dog lid is, 180 ° the symmetric position of being separated by on the contact surface of itself and pusher dog tube nozzle respectively has a protrusion, protrusion can be a barrel mast, shapes such as cuboid have shrinkage pool or the groove identical with the protrusion shape respectively on the opposite position with it on pusher dog tube nozzle plane.But this jack has adopted screw drive, has increased the peripheral operation torsional moment greatly, if add big speed ratio, can increase considerably peripheral volume again; And worm screw great majority adopt the turning technology now, can't satisfy worm screw, and high precision, high roughness of surface requirement are very unfavorable to the service life that prolongs worm screw, worm gear.

The utility model content

The utility model technical issues that need to address provide a kind of large-tonnage lifting screw, it mainly is to solve existing in prior technology can increase the peripheral operation torsional moment greatly with screw drive, if add big speed ratio, can increase considerably peripheral volume again, as adopt worm screw, its great majority adopt turning technology, can't satisfy the requirement of worm screw high precision, high roughness of surface, to very unfavorable etc. technical matters in the service life that prolongs worm screw, worm gear.

Above-mentioned technical matters of the present utility model is mainly solved by following technical proposals:

Large-tonnage lifting screw of the present utility model, comprise the chassis, be connected with body on the chassis, body interior is provided with lifting bolt, lifting bolt be threaded nut and ut socket, the ut socket top is connected with top cover, it is characterized in that described lifting bolt lower end is connected with casting integral type worm gear by key pin, casting integral type worm gear is engaged with worm screw, and worm screw is connected with one or two by driving device and shakes the hand.Worm screw is adopted the single head high strength material, and its profile of tooth forms through high precision machine tool grinding manufacturing after adopting the high speed whirlwind cutting.Worm gear is the casting integral type, and its intensity is stronger, can adapt to the large-tonnage needs.Shake the hand by two, worm screw can be rotated, thereby drive the rotation of casting integral type worm gear, ut socket carries out jacking along screw thread, thereby with object jack-up.Shake the hand and be each one of body both sides, rotary worm more reposefully.

As preferably, be socketed with ratchet on the described worm screw, the last cross-under of shaking the hand has push rod, and push rod is provided with and can throws off or the ingear tooth with ratchet, also has a plurality of shrinkage pools on the push rod, and body is connected with spring, and spring is connected with the steel ball that can embed in the shrinkage pool.Push rod has played the effect of power-transfer clutch, and when not working, tooth on the push rod and ratchet are thrown off, and can't drive worm screw after the rotation of shaking the hand and rotate, and can only dally.During work, promote push rod downwards, the tooth interlock of the tooth of push rod and ratchet, at this moment rotating shakes the hand can drive the worm screw rotation.Two grades of teeth can be arranged on the push rod, be convenient to the just commentaries on classics and the counter-rotating of worm gear.

As preferably, described shaking the hand is connected with by means of the power bar.When tonnage is big, can be rotated by borrowing the power bar.

As preferably, be provided with bearing between described casting integral type worm gear and the chassis, promptly can bear pressure, can conveniently cast the integral type worm gear again and be rotated.

As preferably, have drain oil on the described top cover, can in body, inject lubricating oil.

Therefore, it is little, in light weight to the utlity model has peripheral volume, characteristics such as peripheral operation power is very light, can satisfy client's high security, high service life, and is simple and reasonable for structure.

Description of drawings

Accompanying drawing 1 is a kind of structural representation of the present utility model.

Parts, position and numbering among the figure: chassis 1, body 2, lifting bolt 3, nut 4, ut socket 5, top cover 6, key pin 7, casting integral type worm gear 8, worm screw 9, shake the hand 10, ratchet 11, push rod 12, shrinkage pool 13, spring 14, steel ball 15, borrow power bar 16, bearing 17, drain oil 18, lining 19, end cap 20.

The specific embodiment

Below by embodiment, and in conjunction with the accompanying drawings, the technical solution of the utility model is described in further detail.

Embodiment: the large-tonnage lifting screw that this is routine, as Fig. 1, a chassis 1 is arranged, by bolted connection body 2 is arranged on the chassis.Body is provided with end cap 20, is provided with worm screw 9 in the end cap, is socketed with ratchet 11 on the worm screw 9.Be arranged with two on the body and shake the hand 10, shaking the hand connects handle and borrows power bar 16.Shake the hand on 10 also that cross-under has a push rod 12, push rod is provided with 2 grades can throw off or the ingear teeth with ratchet 11, and also has a plurality of shrinkage pools 13 on the push rod, and body 2 is connected with spring 14, and spring is connected with the steel ball 15 that can embed in the shrinkage pool.Worm screw 9 is engaged with casting integral type worm gear 8, and casting integral type worm gear inside is connected with lifting bolt 3 by key pin 7, is provided with lining 19 between lifting bolt lower end and the chassis 1, is provided with bearing 17 between casting integral type worm gear and the chassis 1.Lifting bolt 3 be threaded nut 4 and ut socket 5, ut socket 5 tops are connected with top cover 6, have drain oil 18 on the top cover 6.

During use, promote push rod 12 downwards, make tooth and ratchet 11 interlocks on it, rotate and shake the hand 10, shaking the hand promptly drives worm screw 9 and is rotated, thereby makes 8 rotations of casting integral type worm gear.3 rotations of casting integral type worm gear drives lifting bolt, because lifting bolt 3 not liftings, the ut socket 5 that therefore is threaded with it rises, thus top cover 6 can the jack-up weight.

Claims

1. large-tonnage lifting screw, comprise chassis (1), be connected with body (2) on the chassis, body (2) inside is provided with lifting bolt (3), lifting bolt (3) be threaded nut (4) and ut socket (5), ut socket (5) top is connected with top cover (6), it is characterized in that described lifting bolt (3) lower end is connected with casting integral type worm gear (8) by key pin (7), casting integral type worm gear (8) is engaged with worm screw (9), and worm screw is connected with one or two shake the hand (10) by driving device.

2. large-tonnage lifting screw according to claim 1, it is characterized in that being socketed with on the described worm screw (9) ratchet (11), (10) the last cross-under of shaking the hand has push rod (12), push rod is provided with and can throws off or the ingear tooth with ratchet (11), also have a plurality of shrinkage pools (13) on the push rod, body (2) is connected with spring (14), and spring is connected with the steel ball (15) that can embed in the shrinkage pool.

3. large-tonnage lifting screw according to claim 2 is characterized in that described shaking the hand (10) is connected with by means of power bar (16).

4. according to claim 1 or 2 or 3 described large-tonnage lifting screw, it is characterized in that being provided with bearing (17) between described casting integral type worm gear (8) and chassis (1).

5. according to claim 1 or 2 or 3 described large-tonnage lifting screw, it is characterized in that having on the described top cover (6) drain oil (18).