CN203305147U

CN203305147U - Puller

Info

Publication number: CN203305147U
Application number: CN2013202667788U
Authority: CN
Inventors: 韩禄频
Original assignee: CHONGQING HAIZHOU CHEMICAL Co Ltd
Current assignee: CHONGQING HAIZHOU CHEMICAL Co Ltd
Priority date: 2013-05-15
Filing date: 2013-05-15
Publication date: 2013-11-27
Anticipated expiration: 2023-05-15

Abstract

The utility model discloses a puller. The puller comprises a screw rod and further comprises an ejection tip, wherein the ejection tip is arranged on the end portion of the screw rod and in running fit with the screw rod. A T-shaped hole is formed in the end portion of the screw rod, the ejection tip comprises a conical head and a T-shaped rod connected to the conical head, the T-shaped rod is inserted into the T-shaped hole and sleeved with a thrust bearing and a locating ring, the thrust bearing abuts against the conical head, one end of the locating ring abuts against the thrust bearing, the other end of the locating ring abuts against a stepped face in the middle of the T-shaped hole, an annular locating groove is formed in the outer cylindrical surface of the locating ring, and a locating pin in sliding fit with the annular locating groove is arranged on the screw rod. When the puller is used for dismounting a workpiece, the screw rod is rotated, then the conical surface of the ejection tip is tightly attached to a workpiece shaft under the action of pressure, the screw rod and the ejection tip rotate relative to each other, however, the ejection tip and the workpiece shaft do not rotate relative to each other, therefore, frictional damage to a fitting surface of the workpiece shaft and the ejection tip due to relative sliding is avoided, and the workpiece shaft and the puller can be protected.

Description

Draw horse

Technical field

The utility model relates to a kind of extracting tool, particularly a kind ofly draws horse.

Background technology

Drawing horse to have another name called thruster, is a kind of for from axle, dismantling the instrument of belt pulley, bearing etc.Of the prior artly draw horse, the top of its screw mandrel and screw mandrel front end is generally monolithic construction, there is a fatal shortcoming in monolithic construction: namely screw mandrel is when rotation advances, top with the contact-making surface of workpiece spindle, relative frictional rotation can occur in a circumferential direction, this will cause: 1, increase the moment of torsion of rotary screw rod, make more effort of operation; 2, the centre bore of the relative frictional rotation meeting defective work piece axle of contact-making surface, be unfavorable for the secondary maintenance of workpiece spindle; When 3, the frictional force between top and workpiece spindle is excessive, wholely draw horse to rotate with workpiece, the stability of impact operation.

The utility model content

In view of this, the purpose of this utility model is to provide a kind of horse of drawing, and it can be avoided top and relatively rotate with workpiece spindle, can solve existing problem of drawing horse to exist.

The utility model draws horse, comprises screw mandrel, also comprise be arranged on the screw mandrel end and with screw mandrel be rotatably assorted top.

Further, described screw mandrel end is provided with T shape hole, describedly toply comprise conical head and be connected to the T shape bar on conical head, described T shape bar is inserted in T shape hole, on described T shape bar, cover has thrust bearing and locating ring, and described thrust bearing leans against on conical head, and described locating ring one end leans against on thrust bearing, the other end leans against on the step surface at middle part, T shape hole, on described locating ring external cylindrical surface, be provided with annular positioning groove, on described screw mandrel, be provided with the alignment pin be slidably matched with annular positioning groove.

Further, also overlap spring is arranged on described T shape bar, described spring one end withstands on locating ring, the other end withstands on T shape boom end.

The beneficial effects of the utility model: the utility model draws horse; its top and screw mandrel adopts the mode that is rotatably assorted; during the dismounting workpiece; rotary screw rod; the top conical surface is close to and is closed with workpiece spindle under pressure, and screw mandrel and top relatively rotate, and do not relatively rotate between top and workpiece spindle; thereby avoided workpiece spindle and top mating surface to cause friction damage because of relative sliding, can protect workpiece spindle and La Ma.

The accompanying drawing explanation

Fig. 1 is the structural representation that the utility model draws horse;

Fig. 2 is the zoomed-in view of P section in Fig. 1.

The specific embodiment

Below in conjunction with drawings and Examples, the utility model is further described.

As shown in the figure, the present embodiment draws horse, comprises screw mandrel 1, also comprise be arranged on screw mandrel 1 end and with screw mandrel 1 be rotatably assorted top.

The present embodiment draws horse; its top and screw mandrel 1 adopts the mode that is rotatably assorted; during the dismounting workpiece; rotary screw rod 1; the top conical surface is close to and is closed with workpiece spindle under pressure, and screw mandrel 1 and top relatively rotate, and do not relatively rotate between top and workpiece spindle; thereby avoided workpiece spindle and top mating surface to cause friction damage because of relative sliding, can protect workpiece spindle and La Ma.

In the present embodiment, the end of described screw mandrel 1 is provided with T shape hole, describedly toply comprise conical head 2 and be connected to the T shape bar 3 on conical head 2, described T shape bar 3 is inserted in T shape hole, on described T shape bar 3, cover has thrust bearing 4 and locating ring 5, described thrust bearing 4 leans against on conical head 2, described locating ring 5 one ends lean against on thrust bearing 4, the other end leans against on the step surface at middle part, T shape hole, on the external cylindrical surface of described locating ring 5, be provided with annular positioning groove 6, on described screw mandrel 1, be provided with the alignment pin 7 be slidably matched with annular positioning groove 6.

During work, the thrust of screw mandrel 1 is delivered on conical head 2 by thrust bearing 4, then is delivered on workpiece spindle from conical head 2, under the isolation of thrust bearing 4, between screw mandrel 1 and conical head 2, can relatively rotate, thereby can avoid the mating surface of conical head 2 and workpiece spindle to damage because of friction slip.Certainly in different embodiments, described screw mandrel 1 and top between also can form the relation that is rotatably assorted by other structure, but, as angular contact bearing connection wire rod that can be by bearing axial pushing force and top, to realize both being rotatably assorted, can reach purpose of the present invention equally.

As the improvement to this enforcement, on described T shape bar 3, also overlap spring 8 is arranged, described spring 8 one ends withstand on locating ring 5, the other end withstands on T shape bar 3 ends.In concrete enforcement, T shape bar 3 is through on locating ring 5 and can prevents from toply from screw mandrel 1, coming off, and applies thrust upwards by 8 pairs of T shape bars 3 of spring, and conical head 2 is leaned against on locating ring 5 all the time, can avoid top loosening, the use that is conducive to draw horse.

Finally explanation is, above embodiment is only unrestricted in order to the technical solution of the utility model to be described, although with reference to preferred embodiment, the utility model is had been described in detail, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement the technical solution of the utility model, and not breaking away from aim and the scope of technical solutions of the utility model, it all should be encompassed in the middle of claim scope of the present utility model.

Claims

1. one kind is drawn horse, comprises screw mandrel, it is characterized in that: also comprise be arranged on the screw mandrel end and with screw mandrel be rotatably assorted top; Described screw mandrel end is provided with T shape hole, describedly toply comprise conical head and be connected to the T shape bar on conical head, described T shape bar is inserted in T shape hole, on described T shape bar, cover has thrust bearing and locating ring, described thrust bearing leans against on conical head, described locating ring one end leans against on thrust bearing, the other end leans against on the step surface at middle part, T shape hole, is provided with annular positioning groove on described locating ring external cylindrical surface, on described screw mandrel, is provided with the alignment pin be slidably matched with annular positioning groove.

2. according to claim 1ly draw horse, it is characterized in that: on described T shape bar also cover spring is arranged, described spring one end withstands on locating ring, the other end withstands on T shape boom end.