What is the molding machine for, the main equipment for molding

Diaphragm compressor is a reciprocating compressor that relies on the reciprocating motion of the diaphragm in the cylinder to compress and transport gas. The diaphragm is clamped by two limiting plates along the perimeter and forms a cylinder, and the diaphragm is driven by hydraulic pressure to reciprocate in the cylinder, so as to realize the compression and delivery of gas. Argon.

Diaphragm compressors have the characteristics of large compression ratio, wide pressure range and good sealing. Because its gas cavity does not require any lubrication, thus ensuring the purity of compressed gas, it is especially suitable for compression, conveying and bottling of flammable, explosive, toxic and harmful, high-purity gases. (e.g. hydrogen, oxygen, acetylene.)

Argon, nitrogen, carbon dioxide.

sulfur hexafluoride, etc.). Depending on the exhaust pressure, it is generally made into a single-stage or two-stage system.

Working principle of argon membrane compressor:

Diaphragm compressors are a combination of two systems – hydraulic fluid.

systems and gas compression systems. A metal diaphragm completely separates the two parts.

Gas Compression System: The gas compression system consists of three layers of metal diaphragm and gas inlet and outlet valves.

Hydraulic oil system: The hydraulic oil system consists of a crankshaft driven by an electric motor.

The piston and connecting rod, through the reciprocating motion of the piston, generates hydraulic oil pressure, and pushes the bottom diaphragm to move towards the gas side, thereby compressing the gas and discharging the gas. Hydraulics.

Another component is a compensating oil pump, a check valve, and a pressure regulating valve.

Ensure that the hydraulic oil system is always in a state of filling with hydraulic oil during the compression cycle. During the compression process, the check valve isolates the hydraulic oil from the compensating oil pump to prevent the hydraulic oil from flowing back, while the pressure regulating valve controls the hydraulic oil pressure, thus creating the pressure of the hydraulic oil system.

When the piston is at the very bottom, the hydraulic system is injected with hydraulic oil by the compensating oil pump, and the gas enters the membrane cavity through the inlet inlet valve under the inlet pressure, and the reverse diaphragm is pushed to the bottom of the membrane cavity. The membrane cavity is filled with gas, when the crankshaft rotates, the piston moves from the bottom to the top, the hydraulic oil system pressure rises, and when the hydraulic oil pressure reaches the compressed gas pressure, the diaphragm moves towards the top of the cavity, compressing the gas.

When the gas pressure in the membrane cavity reaches the back pressure of the exhaust valve, the exhaust valve is opened, the gas is discharged, the pressure of the hydraulic system continues to increase, and the diaphragm continues to move to the top to ensure maximum gas displacement and efficiency, when the diaphragm has completely entered the top of the cavity, the piston continues to move to the top, at this time, the hydraulic oil pressure control valve is opened through the hydraulic oil pressure, the hydraulic oil returns to the crankcase, and the set pressure of the hydraulic oil regulating valve is higher than the outlet pressure (usually times the outlet pressure), This ensures that the outlet pressure of the gas reaches the design value, at which point the compression cycle is completed and the piston begins to move towards the bottom.

As the piston moves towards the bottom, the gap gas and suction gas push the diaphragm pack towards the bottom of the cavity, and the cycle is complete.

The molding machine is a special shoe-making equipment that combines vulcanization, pressing and molding of the sole.

The molding machine has the function of automatic program control, and the hydraulic system is advanced and reliable, which can realize automatic constant temperature, automatic air release, automatic mold starting, and automatic control time. Due to the use of mechanical connecting rod mechanism to ensure that there will be no mold expansion, glue opening, degumming and other phenomena during the vulcanization process of shoes. Because the inverted upper is very clean, it can produce high-quality long-leg, mid-top, and low-top military and police shoes.

Classification of Molding Presses:

Automatic Molding Machine;

Molding machine function;

hot molding machine; plateless stitching molding machine;

Laser molding machine.

It is a special shoe-making equipment that combines vulcanization, pressing, and molding of the sole.

Veneer, shavings or fibers (or unsized) that have been applied with adhesive and are individually laid in special molds and formed by hot pressing. If necessary, the blank can be covered with adhesive film paper or other materials. This kind of product has excellent mechanical properties, good surface decoration effect, no need to be processed at one time, high production efficiency, little or no corner waste, raw materials are fully utilized, and a variety of special-shaped products can be manufactured.

However, the mold design requirements are strict, and the processing cost is large, which is mainly used to manufacture a large number of stereotyped products. Molded products can be divided into veneer molded products, fiber molded products and shavings molded products.

Veneer molded products.

Select the appropriate veneer, and get the desired product through gluing, blank assembly, mold assembly and hot pressing. In hot press forming, the general press hot pressing method is commonly used, but there are also air bag compression forming methods and the roll forming method of pipe coiling machines (Fig. 1). Outdoor products are coated with phenolic resin glue or melamine resin glue, and indoor products are coated with urea-formaldehyde resin glue.

The veneer molding method is used to produce certain special shapes of items, such as chair backs and seats, grain boards (wooden shovels), and other special parts. The mold is heated with electricity or steam, and there are also high-frequency heating.

Figure 1: Fiber molded products.

The fiber is loaded into the mold and hot-pressed to make door leaf surfaces, automobile parts and shingles. The process flow takes the door leaf surface as an example, as shown in Figure 2. Take the unprocessed semi-rigid fiberboard, humidify it first, and then spread a piece of phenolic impregnated crepe film paper on both sides of the slab, and then put it into the mold, or add a piece of the same film paper to the slab to reinforce.

The mold containing the blank is put into a two-layer hot press machine, and the hot press is made at a pressure of megapascals and a temperature of 160 degrees. The fiber can also be pre-pressed into a blank in the mold, and then hot-pressed by a hot pressing mold.

Molded products of particleboard.

The technology of shaving-moulding emerged in the 50s of the 20th century. There are three main process methods: general molding method, box molding method and seal molding method. Among them, the general molding method has developed rapidly, and now the general shaving molding method refers to this method.

There are many types of shavings and a wide range of uses, and there are four main categories: building components (Fig. 3), such as wall panels, ceilings, radiator covers, door and window sills, etc.; furniture components (Fig. 4), such as various countertops, chair backs, dinner plates, etc.; packaging equipment, such as trays and fruit boxes, etc.; Industrial accessories, such as TV cases, refrigerator cases, auto parts and relief crafts, etc.

Fig. 2, Fig. 3, Fig. 4 The process flow of the general molding method is:

Chipping, grinding, drying, sorting, weighing, mixing, paving, pre-pressing, hot pressing. The raw materials of shavings molded products can be wood shavings, bagasse and flax chips.

The mold is the key equipment in the production process of shavings molded products, and the pre-pressing mold cold-presses the glued shavings (a few hot-pressed) into a blank with a similar shape to the product, and the hot-pressed mold further hot-presses the blank into the finished product. Depending on the requirements, surface treatments can be carried out at the same time as the hot pressing process, such as the application of adhesive film impregnated with resin. Typical hot pressing dies include concave molds, punches, guides, heating, steam exhaust, and material retention and decoating devices.

There are presses and molds. The role of the press is to apply pressure to the plastic through the mold. In rubber processing, the press is called a flat vulcanizer.

The main parameters of the press include the nominal tonnage, platen size, working stroke and plunger diameter, which determine the area, height or thickness of the product that can be molded by the press, as well as the maximum molding pressure that can be achieved. According to the characteristics of its structure, the mold can be divided into three types: overflow, non-overflow and semi-overflow, among which the semi-overflow type is the most used.

Molding is the abbreviation of compression molding of the press group, also known as collapse compression molding. Plastic or rubber rubber material is formed into a product by heating and pressure in a closed mold cavity (also a rubber processing) method.