The magical use of vacuum gauges

The calender roller dressing device is often subject to friction, erosion, etc. of rubber, fabrics, and other materials, and becomes rough, even stained. When the surface viscose is severe, it cannot be produced. A roller surface grinding device can overcome the above problems. Make processing as shown. The adjustment structure can be used 30mm x 4mmx100mm flat iron, a M20mm screw is welded at both ends to adjust the friction large and small.

When the wool is ground, the calender is started and the line speed is maintained 5 The calender rollers are heated up to 50 so that the surface adhesive can be removed. Prepare items such as felt, oil, and sand (UXK120). Adjust the roller distance, disengage one side of the grinding device, pass between the two rollers and adjust the nut 1 properly so that the wedge blocks 4 and 6 are in proper position (keeping the spring suitable for automatically adjusting the adjustment amount). Apply the abrasive sand and the appropriate amount of engine oil evenly on the grinding surface (about 100mm in width) of the felt.

In the grinding process, in order to maintain the grinding and grinding, the grinding device can be smoothly moved left and right until it is satisfied. The calendar surface of the calender after grinding by this device is bright as before.

5. Flat iron 7. Handle 8. Mast bar 9. Felt 10. The magical effect of roller vacuum pressure gauge â–¡ Yukiko I was engaged in the maintenance of EPS foam molding machines produced by Daishin Corporation in Japan for many years, and the vacuum on the company's VS series forming machines. Pressure gauges can not be underestimated when servicing such equipment. In the process of maintenance of this kind of equipment, the author summarized a set of methods for rapidly eliminating complex faults using vacuum pressure gauges. Now I introduce them to my colleagues.

First introduce the vacuum pressure gauge: vacuum pressure gauge as shown by 75. Right side 03kgf/cm2 represents positive pressure, reflecting cavity steam or air pressure changes; left 01.Obar table 7K negative pressure, ie vacuum level, reflecting Vacuum changes.

The vacuum pressure gauge on the fixed side or on the moving side is indicated, but the pointer fails to reach the predetermined value to reflect the vacuum failure on the side or the vacuum cannot be extracted. Generally, it can be determined that the side vacuum valve has a problem and is generally a poor seal.

When the product is manufactured, if there is a similar degree of vacuum failure on both the solid and moving sides, the pointer will not fall back when it moves forward. If manual detection (pressing the mold, opening the two vacuum valves, and starting the vacuum pump), this is similar to the degree of poorness reflected by the vacuum gauge when the product is manufactured, and is generally a filter blockage at the public passage to the vacuum pump. If the above manual detection, the vacuum degree reflects better, it is generally the constant current device between the small water pipes leading to the vacuum pump is blocked; if the temperature of the condenser is detected at the same time obviously rises, the cooling water is usually to the condenser The filter is blocked (a long shutdown should pay attention to open the valve through the condenser to the drain before starting, otherwise this phenomenon will also occur).

When the product is manufactured, if both the solid and moving sides reflect a similar degree of vacuum and sometimes there is no phenomenon, or the pointer moves back and forth in an unstable state, even if the pointer is always at 0, or starts at 0, then suddenly it is fast swing. This is basically the case with further manual inspections. Generally, one of the two discharge valves has a fault, and then the two valve manifolds are respectively checked to determine which valve is faulty.

The product quality is not stable (the product sometimes swells and the grain collapses). When the product is manufactured, if the solid side or moving side is in the process of “normal heating” several times in succession, there is a pressure value but the time is low or the pointer swings back and forth. In an unstable state, it can be determined that the lower piston of the side regulating valve is faulty, and the upper pilot valve is normal, and the main valve body needs to be disassembled. Generally, only the sealing ring needs to be replaced.

When the product is manufactured, if the pressure values ​​on both sides reflect the unstable state of 1 above, or if there is no steaming action instruction on other heating process steps, the valve of the steam component is generally faulty, and the seal ring can be replaced normally.

When the product is manufactured, if a certain side is found to be in a heating step, the steam pressure value rises and even rises to “cavity piston abnormality”, which proves that the internal cylinder piston of the lower valve body of the side regulating valve is normal, and it is not necessary to disassemble the inside of the valve body. (If you take a break, you will waste a lot of time). Further manual detection, according to the other side of the "steam valve", if the solid, moving both sides of the steam, or press the other side of the "demoulding air valve", solid, moving both sides of the air, you can determine the side The lower part of the regulating valve is not completely closed, generally the sealing rubber ring is seriously worn, or the valve seat related to the machine body is seriously deformed during the maintenance process, thus causing the magnetic particle inspection machine to enter. Ye Fucheng Our factory has a CEW-10000 type Dual purpose magnetic particle flaw detector for crankshaft inspection during diesel engine overhaul. It is inconvenient to hoist the crankshaft on the inspection machine during on-site use. This is due to the fact that the inner diameter of the longitudinal magnetization coil is 600mm, the maximum rotation diameter of the crankshaft is 440mm, and the clearance is small, which causes care when loading and unloading the crankshaft to avoid collision between the crankshaft and the coil, and it is also inconvenient when inspecting the connecting rod neck. Due to the limitation of the magnetizing energization method originally designed, in order to change the detection position during the working process, the tail shaft and the probe shaft must be retracted away from the workpiece in order to perform transposition detection. The probe end face of the probe shaft and the tailstock shaft and the crankshaft both ends face, when the magnetization has flashover sparks, so that the probe surface and the workpiece shaft end face burn marks. In addition, the four independent supporting wheels originally supporting the crankshaft are difficult to align with the main axis of the crankshaft and the axis of the probe, and adjustment is time-consuming.

So we make the following improvements. Replacing the magnetizing coil and increasing the inner diameter can facilitate the hoisting of the crankshaft. The improved bearing method changes the adjustable copper wheel bearing to the copper tile bearing, improving the front and rear structure respectively.

1. Support base 2. Screw support seat 2. Positioning pin 3. Adjustable copper wheel with copper wire 4. Conductive part 5. Rails remove the probes at both ends, and the electrodes and copper bushes are fastened with screws to generate a magnetic field. Check for circumferential defects parallel to the axis. End burns are also eliminated.

At the same time, the original form of the workpiece transmission structure is changed and the sprocket is used instead of the gear to make the structure simpler. The improved flaw detector is easy to use. W02.01-37 Installation method of small equipment after modification on the original basis â–¡ After Liu Hongfeng's equipment is modified, it is impossible to install the new equipment using the anchor bolts of the original equipment foundation. Therefore, the original foundation was often dismantled and reconstructed, resulting in labor, time, and expense. The following describes a time-saving, labor-saving coagulant foundation treatment method.

Prefabricate a carbon steel plate with the same length and width as the base plane and a thickness of 20mm. On the steel plate, holes corresponding to the number and position of the original foundation bolts are taken, and the hole diameter is larger than the diameter of the anchor bolts by lOrmn. The upper part of the original foundation is cut off, so that the elevation is reduced by about 50mm. Excavation surfaces remain rough without trimming. Then, the surface was wetted with water and poured about 30 mm thick cement mortar.

Place the hole of the steel plate in place with the anchor bolt and place it on the cement mortar. Level the steel plate with a level ruler.

U) After curing for 7 days, cut off the anchor bolts of the steel plate along the surface of the steel plate, weld the steel plate with the anchor bolts, and fill in the holes.

(5) According to the location of the new equipment anchor bolts, gas welding can be used to make the hole about 10mm deep in the determined location one by one. The new ground bolts can be placed in the holes and welded firmly, and the equipment can be installed.

The steel plate should be in good contact with the cement mortar to avoid vibration of the rotating equipment.

In-place bolts and new installations, the weld surface must be flat or slightly lower than the surface of the steel plate, in order to facilitate the installation of equipment.

Even for small rotating equipment, the plate thickness should not be less than 14mm, otherwise it will affect the stable operation of the equipment.

The new ground bolts have a 45 groove at the lower front and the width depends on the bolt size to ensure the firmness of the bolts.

The basic processing method of this kind of equipment is suitable for medium-sized equipment. Cangzhou Dahua TDI Co., Ltd. has used this method to process the foundations of four medium-sized rotating equipments in succession. W02.01-38 closes the illusion. If the above-mentioned manual detection is performed without leakage of steam or air, it is determined that the pilot valve at the upper portion of the regulating valve is defective, and the airbag film is usually broken.

The above faults are common faults in the VS series molding machines, and they are also difficult to judge. The fault phenomenon is subtle and involves a wide range. Some maintenance personnel are often left unconscious, especially when they encounter a “product quality instability” fault. Due to the number of valves involved, the structure of the regulating valve is the most complex, and both the solid and moving regulating valves in one machining cycle are used to complete the exhaust 'VS heating', 'deferred heating' and 'normal heating'. This key step depends on the pressure set by each, and the control valve maintains the set-up state of dynamic equilibrium. The control part involved is very complicated. Some maintenance personnel do not understand these complex process steps at all, so they are excluded. "Failure in product quality" is the biggest difficulty in maintenance. In the maintenance practice, the author made full use of the above experience to basically eliminate blind repairs and accurately eliminate these seemingly complex faults in a short period of time. W02.01-36 New North Road, No. 1 Electric Measurement Village No. 400020 (Editing Li Wen) Design and Development 2002

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