The technology of central control blow molding is to make the moulded embryo cling to the inner wall of the mould by air pressure. A variety of methods of extruding the core from a solution to form a mold. The extruded die is suspended vertically by its own weight.
In the prior art, due to gravity sag, the upper part of the product will be thinner and the lower part will be thicker, especially for the longer products. However, some materials with higher melt index (PC, ABS, LDPE) are difficult to be formed. If the die wall thickness can not be effectively controlled in the process of blow molding, the different blowing ratio of different parts will cause uneven thickness of products. Because of its strength, the minimum wall thickness is specified for the products of central control vessels. In order to make the thinnest part of the products meet the minimum wall thickness requirements, other parts of the products should be thickened accordingly, resulting in waste of materials. Therefore, uniform wall thickness is to ensure the strength of products and increase the cost of raw materials as the premise.
Contents of utility model
The problem to be solved by the utility model is to provide a wall thickness controller which can form different wall thickness for different parts in the process of blow molding.
The utility model has the following beneficial effects: by adding the wall thickness controller, the use of raw materials is reduced, the cost is saved, the cooling time of the products is shortened, and the production cycle of the products is accelerated.
Description of drawings
Fig. 1 is the structural diagram of the utility model.
Among them: 1. Controller; 2. Electro hydraulic servo valve; 3. Action actuator; 4. Straight line Displacement sensor 5. Servo cylinder; 6. Die core.
Mode of implementation
The specific implementation method of the utility model is briefly described in combination with the attached drawings.
As shown in Fig. 1, a wall thickness controller mainly consists of controller 1, electro-hydraulic servo valve 2, action actuator 3 and straight line Displacement sensor The action actuator 3 is mainly composed of servo cylinder 5 and die core 6; the electro-hydraulic servo valve 2 and linear displacement sensor 4 are connected with the controller 1 and the action actuator 3; the servo cylinder 5 is connected with the mold core 6. The electro-hydraulic servo valve 2 and the linear displacement sensor 4 are connected with the servo cylinder 5 in the action actuator 3.
Working mode: the user sets the axial variation curve of die blank wall thickness on the controller 1, and the controller 1 outputs the voltage or current signal varying in size according to the wall thickness curve to the electro-hydraulic servo valve 2. The electro-hydraulic servo valve 2 drives the servo cylinder 5 to control the mold core 6 to move up and down, resulting in the change of die core 6 gap. The linear displacement sensor 4 obtains the corresponding voltage signal by measuring the gap size, and feeds back to the controller 1 to complete the working circuit.
An embodiment of the utility model has been described in detail above, but the content described is only a better embodiment of the utility model, and can not be considered as limiting the implementation scope of the utility model. All equal changes and improvements made according to the application scope of the utility model shall still be within the scope of the patent of the utility model.