Has the characteristics of the hydraulic vulcanizing machine structure: dual mode shape vulcanizing machine is in general use first mechanical vulcanizer, adopt crank gear - link (or the four connecting rod) structure, organization principle, simple. In the closing moments and clamping force, with smaller motor power can obtain larger clamping force. After clamping machine no longer work, and clamping force can always keep to open mould again. The mechanical vulcanizing machine in the world today is different manufacturer and specifications, and after many years of continuous improvement, but the basic structure is the same, also have no change.
In the popularization and application of the mechanical sulfide at the same time, also appeared the hydraulic vulcanizing machine. But because at the beginning of the hydraulic vulcanizing machine is not obviously, the advantages of mechanical vulcanizing machine and hydraulic technology at that time were not very mature, I was on the hydraulic vulcanizing machine maintenance is not very adapt to, so for a period of time the hydraulic vulcanizing machine not like mechanical vulcanizer widely promoted. But with the continuous development of auto industry and tire industry, puts forward higher and higher on the uniformity of the tire requirements, also put forward higher and higher precision of vulcanizing machine work requirements, the superiority of the hydraulic vulcanizing machine is fully displayed. Hydraulic technology is also becoming mature at the same time, the maintenance is no longer become a big problem. So now the world's main tire company has gradually adopt hydraulic vulcanizing machine to replace the traditional mechanical vulcanizer. They are building a new factory or old factory technical renovation, has basically adopts the hydraulic vulcanizing machine. Hydraulic vulcanizing machine instead of mechanical vulcanizing machine there is no doubt has become a development trend.
Mechanical vulcanizer has its structure characteristics, but this kind of structure is also brought some inherent weaknesses.
Mechanical vulcanizing machine clamping force is relied on the elastic deformation of each mechanical component. In the mould clamping force, clamping and downward deflection on both ends of the beam, on the base of upwarping on both ends, connecting rod outward deflection on both ends of the elongated and its, crank gear and the lower connecting rod outward migration, as shown in figure 1. Thus, even a brand-new vulcanizing machine, manufacturing quality is good, no wear and tear when clamping the flexure deformation must occur. The axis of the sulfide station will deviate from the vertical position of the theory of being twisted, and this axis vertical position from the theory to be twisted position each process is just repeat once at a time. That is to say, the axis in the moment is combining a model with Angle turning movement.
Due to the deflection deformation of mechanical components, mould by clamping force along the circumferential direction is not evenly distributed, the end is the lateral stress is greater than the middle, as shown in figure 2. Some vulcanizing machine factory in order to solve this problem has taken some remedial measures, such as when not clamping the crank gear bottom pour in advance (crank gear axial downdip outside a tiny Angle), as well as in the bar with wedge sheet packing, etc., this for a particular specifications of the tyres and the vulcanizing machine didn't wear certain compensation effect, but in the transform tire specifications or vulcanizing machine parts wear, the compensation effect is greatly reduced.
Two-mode vulcanizing machine structure is on the left and right sides is symmetrical, but due to the manufacturing error, can't do absolute symmetry. Vulcanizing machine factory take various measures to ensure the symmetry of parts, such as connecting rod machining in pairs, wallboard processing in pairs, try to use nc machine tools, etc., but on the beams, the base, the crank gear, shaft, and gear, etc., it's hard to do absolute symmetry. Due to the symmetry error problems, flexible in order to keep the machine running, the movement of parts with generally adopt a loose fit tolerance. Such as connecting rod hole and on the beam axis and the matching between the crank pin (E8 / E8), with the crank shaft and hole base for (E8 / E8), on the beam axis and the matching of the roller for (F8 / E8), roller and wall panel with the guide for (H9 / F8), on the face of the beam, and the base face and cumulative gap between the connecting rod surface is 1.15 ~ 1.5 mm, etc. This symmetry and the presence of these tolerances for further vulcanizing machine clamping precision especially repeat precision. Mechanical beam in vulcanizing machine structure also determines the copper pin on the upper connecting rod set of the force applied to connecting rod, crank gear shaft of the lower copper sleeve, and the crank pin on connecting rod of the lower copper sleeve force is uneven, and it turn several connection parts are under heavy load, this inevitably lead to the copper set of uneven and the serious wear and tear. And copper set of wear and tear will further reduce the vulcanizing machine clamping precision. In order to keep the vulcanizing machine clamping precision, the copper set of wear degree must regularly check and change in time.
In addition, the clamping force of mechanical vulcanizing machine is the arrival of the crank pin bottom dead center moment determined by the elastic deformation of each mechanical components. Size and temperature changes will make the stress changes, clamping force will also subsequently and change. So mechanical clamping force of vulcanizing machine is more sensitive to temperature. Before put into use or stop for a period of time to start must be preheated. During the production environment temperature or working temperature fluctuations will cause mould clamping force fluctuations.