CN1020686C

CN1020686C - Tyre forming drum

Info

Publication number: CN1020686C
Application number: CN 91103259
Authority: CN
Inventors: 王玉新; 张勇
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 1991-05-24
Filing date: 1991-05-24
Publication date: 1993-05-19
Anticipated expiration: 2006-05-24
Also published as: CN1055320A

Abstract

The present invention relates to a folding tyre forming drum. In the initial stage of the folding process of the forming drum, the circumferential relative velocity of a pair of drum tiles laminated oppositely approaches to zero, namely in the initial folding stage, a small drum tile is contracted relatively to a big drum tile in radial direction. Therefore, in a contracting process, no jagging phenomenon appears between the drum shoulder surfaces of big drum tile and the small drum tile. Consequently, the distribution uniformity of tyre body cords in a circumferential direction is enhanced. At the same time, because a double-circle tile distribution mode is adopted, a folding ratio is larger than that of an MX type forming drum. The forming drum with the structure has the characteristics of simple design, easy manufacture and wide application range, and is especially suitable for forming meridian tyres with high quality.

Description

Tyre forming drum

The invention belongs to the category of tire building industry, is a kind of mould of tire, and this assembly drum can be applicable to the moulding of radial and the moulding of engineering tyre.Also can be used as simultaneously the renewal product of Bias tyre assembly drum.At present, the tire assembly drum that uses in China's tire building industry is generally the inertia folding drum, this folding drum is in folding process, drum watt surface relative velocity tangentially is bigger, rousing at superimposed initial stage fetus inwall under the effect of watt surperficial relative motion, the fetus inwall is produced serious cutting frustrate squeezing action, the fetus inwall produces to cut to frustrate and peels off, destroyed casing ply along the uniformity that circumferentially distributes, particularly for radial, its casing play＜or claim enhancement Layer the angle of cord line and axis be approximately zero, cut when frustrating squeezing action at the carcass inwall, even more serious to cord along the inhomogeneity extent of damage of circumferentially distribution.

Domestic six watts, eight watts, nine watts, ten watts, 12 watts of four watts, the six watts collapsible assembly drums of ellipse and MX type assembly drums＜have etc. that have commonly used〉two kinds of versions.Some producers use the assembly drum of MX type assembly drum as radial.The tire assembly drum of above-mentioned two kinds of forms all exists serious cutting to frustrate in lamination process to peel off phenomenon.

From the situation that external assembly drum is applied for a patent, its tire assembly drum mainly contains three classes from version: MX type, MCX type and ML type.The MX type is a rotary folding type, generally is used for the production moulding of Bias tyre, seldom is used for the production moulding of radial, is on the verge of to eliminate.The ML type is pneumatic link-type radial contraction formula assembly drum since the assembly drum of this kind structure need＜main shaft punching supporting with special make-up machine, ventilation, limited its application at home.MCX type assembly drum is a cam link formula structure, and the design complexity of this drum, difficulty of processing are big, cost is high, and the life-span is low, the carcass Forming Quality is poor, only is used for the moulding of small-sized radial-ply tyre.

The objective of the invention is to address the above problem, the one, utilize domestic existing folding former to realize the radial contraction of assembly drum, overcome the generation of MX type and bag-like tire assembly drum and cut the shortcoming of frustrating, peeling off.The 2nd, the designed assembly drum of the present invention all adopts linkage, has the advantage of simplicity of design, easy to maintenance, long service life.The 3rd, adopt two circumference cloth watt modes, can utilize cloth watt space fully, make folding relatively MX assembly drum big, and limit profile be a circle during its contraction state.

Describe the structure and the operation principle of assembly drum in detail below in conjunction with accompanying drawing.

Fig. 1 is the cutaway view of assembly drum under deployed condition.

Fig. 2 is the front view of assembly drum under closed state.

Fig. 3 is the transverse sectional view of assembly drum under deployed condition.

Fig. 4 is the trajectory diagram that assembly drum is superimposed and launch.

As shown in Figure 1, [1] is cover plate, and [2] are the drum shoulder, and [3] are the drum wall, and drive member [4] links to each other with forming machine main spindle by flat key, and braking element [5] links to each other with make-up machine braking cover, and drive member [4] and braking element [5] constitute movingly.When assembly drum is superimposed, braking sleeve (not shown) braking braking element [5] by make-up machine, forming machine main spindle drives drive member [4] and turns clockwise, make between drive member [4] and the braking element [5] and produce relative rotation, thereby drive all the other link motions, finish the lamination process of assembly drum.

Connecting rod [22] is hinged with bearing pin [6] and braking element [5], connecting rod [20] is hinged with bearing pin [21] and drive member [4], connecting rod [22] is hinged with bearing pin [16] and connecting rod [20], and drive member [4], braking element [5], connecting rod [22] and connecting rod [20] constitute a lanar four rod mechanism.This mechanism is the basic bar group of assembly drum drum watt self-movement unit.Connecting rod [17] is hinged with bearing pin [18] and side drum tilt [19], connecting rod [14] is hinged with big drum watt [7] and side drum tilt [19] respectively with bearing pin [12] and bearing pin [15], connecting rod [13], connecting rod [17] and connecting rod [14] and side drum tilt [19] constitute a lanar four rod mechanism, with the drum watt self-movement unit basic bar group be public rod member with connecting rod [17], promptly connecting rod [17], connecting rod [22] are the one rod member.Connecting rod [9] is hinged with big drum watt [7] and connecting rod [11] respectively with bearing pin [8] bearing pin [10], constitute another lanar four rod mechanism by big drum watt [7] and connecting rod [9], connecting rod [11] and connecting rod [13], with the drum watt self-movement unit basic bar group be public rod member with connecting rod [13], promptly connecting rod [13], connecting rod [20] are the one rod member.Hinged with bearing pin [16] with the one rod member of being made up of connecting rod [13] [20] by the one rod member that connecting rod [11] [17] [22] is formed, connecting rod [13] and connecting rod [14] are articulated in bearing pin [12] jointly and locate.

For making the superimposed initial stage of assembly drum, the relative big drum of side drum tilt watt has bigger radial contraction, and the angle between connecting rod [17], the connecting rod [22] is approximately the right angle.(effect that relative braking element [5] with drive member [4] turns clockwise is identical when the rotation of relative drive member [4] inhour of braking element [5], here just be convenient to explanation), the tangential velocity of bearing pin [6] makes to have maximum angular speed with bearing pin [16] for the connecting rod of relative pivot [22], make the angle approximately equal of connecting rod [14], connecting rod [17] and connecting rod [13] simultaneously, thereby guarantee superimposed initial stage side drum tilt [19] connecting rod [13] instant translation relatively, make the relative big drum watt [7] of side drum tilt [19] that bigger radial contraction be arranged.

For making assembly drum have bigger rigidity in deployed condition, connecting rod during expansion [9] should be in a straight line with connecting rod [11].

As shown in Figure 2, assembly drum of the present invention big drum when closed state watt leans on each other mutually, constitutes to be approximately the circular external shape profile, shrinks inside in big drum watt fully with side drum tilt that big drum watt is connected with connecting rod, and it is circular that the interior profile that side drum tilt constitutes also is approximately.

When closed state, braking element [5] forms sharp angle with connecting rod [22], to guarantee having bigger close launching arc track that the arc track of initial stage bearing pin [18] when bearing pin [16] rotate and bearing pin [18] rotate around bearing pin [21], make connecting rod [20] when following drive member [4] rotation, connecting rod [17] has minimum angular speed with respect to connecting rod [20], promptly at the expansion initial stage, side drum tilt [19] is followed connecting rod [20] and is rotated together, with respect to big drum watt [7] minimum radial development is arranged.The triangle that is surrounded with bearing pin [8] [10] [12] makes bearing pin [12] to the distance of bearing pin [10] bigger increase be arranged at the expansion initial stage, make big drum watt [7] relatively side drum tilt [19] bigger expansion is arranged, thereby provide necessary space for the expansion of side drum tilt.

Below in conjunction with Fig. 1 and a pair of drum of Fig. 4 watt by the operation principle that is deployed into superimposed trajectory diagram explanation assembly drum.

Press relative motion principle, braking braking element [5] allows drive member [4] turn clockwise and brakes drive member [4] and allow the anti-clockwise motion result of braking element [5] be identical.Bulging for convenience of explanation watt motion process makes drive member [4] fixing, the rotation of braking element [5] inhour.Braking element [5] inhour rotation drivening rod [22] [17] make side drum tilt [19] relatively big drum watt [7] bigger radial contraction amount＜see Fig. 4 is arranged.The position of side drum tilt is after angle is divided equally in relative rotation with connecting rod [22], the tracing point that obtains successively.Can be clear that by Fig. 4 it is bigger that connecting rod [22] turns over the distance that side drum tilt shrinks at first under the situation of equal angular.Then, along with the increase of connecting rod [22], [20] relative rotation, each of assembly drum is contracted to closed state for bulging watt gradually.

Best applications of the present invention is the assembly drum that is used for radial, also can be used for the moulding of engineering tire, can also be used for the renewal product as the Bias tyre assembly drum.

Claims

1, a kind of tire assembly drum, comprise big drum watt [7], side drum tilt [19], drive member [4], braking element [5], with the guide mechanism of forming by connecting rod, it is characterized in that reaching the connecting rod [20] that is connected with [4] by drive member [4], braking element [5] and the connecting rod [22] that is connected with [5] constitute first lanar four rod mechanism; By with connecting rod [20] be the connecting rod [13] of one, connect the connecting rod [14] of big side drum tilt, with connecting rod [22] be that the connecting rod [17] of one and side drum tilt [19] constitute second lanar four rod mechanism; By with connecting rod [22] be the connecting rod [11] of one, with connecting rod [20] be the connecting rod [13] of one, big drum watt [7] be connected big drum watt [7] to the connecting rod [9] of connecting rod [11] and constitute the 3rd lanar four rod mechanism.

2, tire assembly drum as claimed in claim 1, when it is characterized in that tire assembly drum launches, the angle approximately equal of connecting rod [14] and connecting rod [17] and connecting rod [13].

3, tire assembly drum as claimed in claim 1 is characterized in that the angle between connecting rod [17] and the connecting rod [22] is approximately 90 °.