There are two ways to install vacuum pumps for automatic box sealing machines, vacuum packaging machines, one is built-in type, generally adopting single-stage rotary vane vacuum pumps, general box sealing and packaging machines, and some manufacturers choose two to reduce costs, high speed, and fast wear. , Short service life, low speed, large force distance, relatively extended service life. The other is an external type. Generally, a two-stage rotary vane vacuum pump is used. The pump has a fast pumping rate and a higher vacuum than a single-stage pump. It is generally suitable for large production batches, high vacuum requirements, or outdoor installation. To reduce exhaust pollution. The vacuum gauge is generally axially front, and is installed on the operation panel or the front of the fuselage.
The thickness of the stainless steel sheet of the automatic box sealing machine is usually that the thin thickness is simply deformed after the vacuum is pressed, and the weld seam is cracked, and the vacuum chamber is leaked. In addition, generally, a sealing groove is opened on the plane around the vacuum chamber of the stainless steel. The groove flatness is poor, and the sealing function of the vacuum chamber is correspondingly reduced. Therefore, the upper vacuum chamber of some models now uses aluminum alloy casting after milling and sealing grooves, and the lower vacuum chamber uses thick stainless steel plates to be processed into flat plates. When purchasing, if you are packing boring and non-corrosive materials such as solids and granules, you can use aluminum alloy raw materials. For materials with soup, salt and high acid content, you can choose stainless steel materials or aluminum-magnesium alloy materials. . Sealing ring is generally selected from silicone rubber, black rubber, and a few low-end products are foamed rubber. Silicone rubber has high temperature resistance, corrosion resistance, good sealing performance, long service life, and poor sealing performance, easy fall, and short service life.
Two vacuum solenoid valves for automatic box sealing machines are generally used, one is a two-position three-way solenoid valve. The first effect is to control the upward and downward displacement operation of the thermocompression sealing equipment. The other is a two-position two-way solenoid valve. The primary effect is that after the vacuum and heat sealing are completed, the passage is opened to return the atmosphere to the vacuum chamber, otherwise the vacuum chamber cannot be opened.
The double chamber is reciprocating. The lower vacuum chamber is divided into two left and right working chambers. The upper vacuum chamber is supported by four connecting rods for left and right displacement. The four connecting rods are fixed on two long shafts. There are tension spring forks on the long shafts. The two tension springs are fixed on the frame at the lower part and the tension spring forks on the upper part to balance the gravity of the operation. The two long shafts are positioned by two sets of bearing seats, and the upper parts of the four connecting rods are also inlaid with miniature bearings. Therefore, the left and right displacement is very easy. When the vacuum is started, the pressure is slightly increased, and it can be actively opened after the air return is completed.
The automatic box sealer supports the four connecting rods of the upper vacuum chamber. Each of the two front and rear on the long axis must be parallel, and the left and right two sets of connecting rods must also be relatively parallel to ensure that the upper vacuum chamber is in any left and right orientation. Both are in parallel with the lower vacuum chamber. Otherwise, the upper and lower vacuum chambers cannot be parallel, the operating pressure is significantly increased, and in severe cases, the vacuum cannot be established normally. The vacuum packaging machine on the vacuum packaging machine is open, displacement and balance equipment. There are two types of vacuum packaging machines: single chamber and double chamber. The single chamber is a flap type. There are two sets of brackets at the back of the upper and lower vacuum chambers. The long axis of the spring is balanced by double torsion springs, with varying degrees of openness.