CN207418113U

CN207418113U - Prevent that large-scale four claw crabs from cranking arm the roll sleeve device of abrasion

Info

Publication number: CN207418113U
Application number: CN201720842293.7U
Authority: CN
Inventors: 廉荣光; 田子敬; 白玉
Original assignee: Wuhan Heavy Industry Casting and Forging Co Ltd
Current assignee: Wuhan Heavy Industry Casting and Forging Co Ltd
Priority date: 2017-07-12
Filing date: 2017-07-12
Publication date: 2018-05-29
Anticipated expiration: 2027-07-12

Abstract

Prevent that large-scale four claw crabs from cranking arm the roll sleeve device of abrasion the utility model is related to a kind of, roll sleeve is sleeved on pivot pin, and the diameter in roll sleeve hole is more than pin diameter, and roll sleeve can rotate on pivot pin；Pivot pin both ends pass through bearing, and the diameter of pivot pin is less than bearing aperture, and pivot pin can rotate freely on bearing；The retainer ring soldering of pivot pin both ends.When large-scale four claw crabs are cranked arm using the utility model, the bearing of two the utility model is respectively welded at clamp arm top, to the scope of clamp arm friction when being inclined to clamp arm by the one side of chain friction, be about 45 ° with clamp arm plane included angle, and making two bearing spacing slightly larger than chain work.The position of roll sleeve is slightly more prominent than tong arm side; therefore roll sleeve can only be touched during chain work; and it is not readily accessible to clamp arm; during pair is hooked above and below chain; generating frictional force to roll sleeve makes roll sleeve be rotated around pivot pin; the force of rolling friction to axis pin and bearing hole is only generated, so as to which clamp arm be protected not to be worn, improves clamp arm and the service life of tongs.

Description

Prevent that large-scale four claw crabs from cranking arm the roll sleeve device of abrasion

Technical field

The utility model is related to a kind of devices for the clamp arm service life for improving tongs, are specially that one kind prevents large-scale four paws Tongs is cranked arm the roll sleeve device of abrasion.

Background technology

In large forgings forging process, increased with the weight of parts, the blank weight of required forging and forging The tonnage of steel ingot all greatly improves, and this requires the crane capacity of tongs also accordingly improves, in actual production, lifts by crane large-scale weight Object is typically double hook driving lifting, selects the large-scale four claw crabs of both arms intersection.

The clamping for the large-scale four claw crabs that both arms intersect and opening process are mainly by main chain sling item and secondary chain sling item Up and down to realize, main chain sling uplink, secondary chain sling item loosens downwards then tongs clamping；Secondary chain sling uplink, main chain sling to Under loosen then clamp opening.In the actual production process, it is often necessary to which hoisting heavy and the multiple tongs that rotates could will weigh repeatedly Object swings to most suitable position, therefore just needs main chain sling item and the continuous uplink and downlink of secondary chain sling item, and follows tongs one Rise and rotate, in these repeatedly irregular movement secondary chain sling item can and tongs clamp arm side localized contact and generate friction, Since friction position is fixed in a certain smaller scope, the chain local frictional long-term to clamp arm makes clamp arm by friction part Abrasion groove is generated, as usage time increases, abrasion groove is more and more deeper, and final tong arm abrasion is exceeded and causes tongs report It is useless.The abrasion of tong arm not only influences safety in production and also reduces service life.

The content of the invention

The purpose of this utility model is for above-mentioned present situation, it is desirable to provide it is a kind of clamp arm to be protected not to be worn, improve folder The large-scale four claw crabs that prevent of arm and tongs service life are cranked arm the roll sleeve device of abrasion.

The utility model aim realization method is to prevent that large-scale four claw crabs from cranking arm the roll sleeve device of abrasion, and roll sleeve is sleeved on On pivot pin, the diameter in roll sleeve hole is more than pin diameter, and roll sleeve can rotate on pivot pin；Pivot pin both ends pass through bearing, pivot pin it is straight Footpath is less than the diameter of bearing hole, and pivot pin can rotate freely on bearing；Retainer ring soldering of the pivot pin both ends positioned at roll sleeve both sides； Pivot pin both ends are stretched out outside two bearings.

When large-scale four claw crabs during hoisting heavy are cranked arm using the utility model, the bearing of two the utility model is distinguished Clamp arm top is welded on, and is inclined to clamp arm by the one side of chain friction, is about 45 ° with clamp arm plane included angle, and makes two bearings To the scope of clamp arm friction when spacing works slightly larger than chain.The position of roll sleeve is slightly more prominent than tong arm side, therefore during chain work Roll sleeve can only be touched, and is not readily accessible to clamp arm, during pair is hooked above and below chain, generating frictional force to roll sleeve makes roll sleeve It is rotated around pivot pin, only generates the force of rolling friction to axis pin and bearing hole, so as to which clamp arm be protected not to be worn, improve folder The service life of arm and tongs.

Description of the drawings

Fig. 1 is the utility model structure diagram,

Fig. 2 is the utility model usage state diagram,

Fig. 3 is enlarged drawing at A in Fig. 1,

Fig. 4 is the B-B direction view of Fig. 3.

Specific embodiment

With reference to Fig. 1, the roll sleeve 2 of the utility model is sleeved on pivot pin 1, and the diameter in roll sleeve hole is more than pin diameter, and roll sleeve 2 can It is rotated on pivot pin 1；1 both ends of pivot pin pass through bearing 3, and the diameter of pivot pin 1 is less than the diameter of bearing hole, and pivot pin can be on bearing certainly By rotating；Retainer ring 4 soldering of the pivot pin both ends positioned at roll sleeve both sides；Pivot pin both ends are stretched out outside two bearings.

The diameter of pivot pin 1 is less than bearing bore dia 3-4mm, and pivot pin 1 is allow to be rotated freely on bearing.

The diameter in roll sleeve hole is more than the diameter 2-3mm of pivot pin, and roll sleeve 2 is sleeved on pivot pin 1, and roll sleeve can revolve on pivot pin 1 Turn.

It is short 8-10mm that 100mm, than two 3 spacing of bearing of length of roll sleeve 2 outside two bearings are stretched out in 1 both ends of pivot pin.

The pivot pin and roll sleeve and pivot pin and bearing hole of the utility model are rolling friction, and lubricant is machine oil.Reference When large-scale four claw crabs during hoisting heavy are cranked arm using the utility model, the bearing 3 of two the utility model is divided for Fig. 2,3,4 6 top of clamp arm is not welded on, and is inclined to clamp arm by the one side of chain friction.Roll sleeve 2 and clamp arm plane included angle are about 45 °, and are made To the scope of clamp arm friction when two bearing spacing work slightly larger than chain.The position of roll sleeve is slightly more prominent than tong arm side, therefore chain Item 5 can only touch roll sleeve when working, and be not readily accessible to clamp arm.During pair is hooked above and below chain, rub to roll sleeve generation Wiping power makes roll sleeve be rotated around pivot pin, the force of rolling friction to pivot pin and bearing hole is only generated, so as to which clamp arm be protected not ground Damage, improves clamp arm and the service life of tongs.

Claims

1. prevent that large-scale four claw crabs from cranking arm the roll sleeve device of abrasion, it is characterised in that roll sleeve is sleeved on pivot pin, roll sleeve hole it is straight Footpath is more than pin diameter, and roll sleeve can rotate on pivot pin；Pivot pin both ends pass through bearing, and the diameter of pivot pin is less than the straight of bearing hole Footpath, pivot pin can rotate freely on bearing；Retainer ring soldering of the pivot pin both ends positioned at roll sleeve both sides；Pivot pin both ends are stretched out two Outside bearing, the bearing is respectively welded at clamp arm top, and is inclined to clamp arm by the one side of chain friction, roll sleeve and clamp arm plane holder Angle is about 45 °, and the scope that two bearing spacing is made to rub when working slightly larger than chain to clamp arm.

2. according to claim 1 prevent that large-scale four claw crabs from cranking arm the roll sleeve device of abrasion, it is characterised in that：Pivot pin Diameter is less than bearing bore dia 3-4mm.

3. according to claim 1 prevent that large-scale four claw crabs from cranking arm the roll sleeve device of abrasion, it is characterised in that：Roll sleeve hole Diameter be more than pivot pin diameter 2-3mm.

4. according to claim 1 prevent that large-scale four claw crabs from cranking arm the roll sleeve device of abrasion, it is characterised in that：Pivot pin two It is short 8-10mm that 100mm, than two bearing spacing of length of roll sleeve outside two bearings are stretched out in end.