Business – PMC Contracting Company https://summiteg-group.com Prefect Manhole Cover Thu, 15 Sep 2022 11:57:57 +0000 en-US hourly 1 https://wordpress.org/?v=6.7.2 214859830 Manhole Cover Process https://summiteg-group.com/manhole-cover-process/ Thu, 15 Sep 2022 11:37:41 +0000 https://summiteg-group.com/pmc/?p=2782

Manhole Cover Process

1. SMC molding process
Preparation before pressing (mold temperature rise, press process parameter setting) —
SMC sheet material cutting — mold feeding — holding pressure —- demoulding —-
processing (removing waste edges, etc.) —- finished product.
1. Preparation before pressing (mold temperature rise, press process parameter setting): Usually, the mold temperature is generally between 140° and 160°, (the detection temperature of the mold is about 135° for the lower mold and about 145° for the upper mold). The cavity temperature must be uniform.
Deviation should be controlled within 30C. The molding pressure is 15-25 MPa.
2. Before pressing, to check the temperature and whether the material sticks to the mold, you can put a little less material to test the pressure; when the temperature is low or the mold finish is poor, it will stick to the mold. Generally use zinc stearate, beeswax, or paraffin as a release agent. But it should not be used for
many purposes, otherwise, the surface of the product will be polluted. When the film is not sticky, a release agent is not needed.
3. SMC sheet cutting material:
Cut SMC sheet to prepare for mold feeding. When SMC is cutting, first cut longitudinally, then transverse Cutting, as shown:
4. Mold feeding:
After rigorous weight calculation, put the SMC sheet into the mold, usually, the feeding area is between 60% and 80%. SMC should be placed in spokes (as shown in the figure) to facilitate exhaust. Otherwise, the product is easy to form an interlayer.

SMC molded manhole cover production process parameters.

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Composite Trench Cover https://summiteg-group.com/composite-trench-cover/ Wed, 26 Aug 2020 11:17:16 +0000 https://www.devsnews.com/wp/bildpress/?p=108

Composite Trench Cover

It’is mainly used in the inspection wells, cable trenches, drainage ditches and other areas of departments such as electric power, telecommunication and so on. Product size and load can be customized design and production according to different requirements.

Production Process

(1) Raw material preparation:
After receiving the production process card, first, check whether the stock raw materials used in this batch
of products meet the requirements (including filler moisture content, oil absorption value, resin viscosity,
etc., and a laboratory report is required), and then screen all the needed screened materials in advance, after
all raw materials meet the production requirements, strictly measure according to the process card, and
make the material name mark, and finally stack according to the batch. A small test or a pilot test must
be carried out before the formal batch production, If no problem can be transferred to batch production.

(2) Resin paste production:
2.1 Resin paste mixing:
2.1.1 Equipment preparation and start&stop procedures Adjust the mixing paddle, After installation of
cans, fix it with all safety devices (the positioning device should fall into the positioning hole on the ground) and start the disperser. After there is no abnormal sound, can turn the speed control button to idle once. After everything is normal, Can officially drive. At the end of mixing or due to the observation of mixing stop, be sure to speed down to 300 RPM max before the control panel can be stopped by the host.
2.1.2 Process control points
(1) adding resin and low-shrinkage agent to the 2000L tank to start stirring, Lasting 10-11 minutes.
(2) Adding initiator, inhibitor, color past, and styrene and stirring until uniform, lasting 3-5 minutes;
(3) adding mold release agent to stir evenly, increase the speed to the vortex, up and down the adjustment
several times, lasting 2-5 minutes;
(4) add Filler, until dispersed, lasting 10-20 minutes;
(5) in the above raw materials and mixed evenly, in advance with the next process,
after the next process is ready, start to add a thickening agent(MgO), in a very short time to make it evenly dispersed, and put it into the powder tank.
2.2 SMC Sheet production:
(1) Observe whether the total pressure gauge reaches 7.5 bar, if not quickly replenished;
(2) Observe whether all the fibers are put through the yarn feeding tube and reach the position of the cutting roller and whether the quantity stored is sufficient for this production. COTS air pressure according to the new and old degree in the range of 3-5 bar, pressure roller air pressure should be lower than cots.
(3) Be sure to tighten the impregnated tape before starting, otherwise, the machine will be damaged due to the SAG of the impregnated tape;
(4) check the position of the film and if the squeegee slot is suitable, if it is in the 20mm range, the screw the knob on the shaft side can be adjusted appropriately, if more than 20mm, the squeegee should be adjusted properly or the film should be removed for proper adjustment;
(5) press the pneumatic pedal valve of the moving material slot to check whether the
action is sensitive and whether the blade clearance is appropriate;
PMC PREFECT MANHOLE COVER 15
(6) check whether the swinging or coiling device is in normal operation.
(7) adjustment of press and impregnated tape: Check that the length of the impregnated tape is suitable, and the air pressure of the rear cylinder (feeding sheet) should be lower by about 6 bar (adjusted according to the length of the press). Too much air pressure will damage the machine and Mesh tape, the air pressure of the front cylinder can be adjusted according to the requirement of the glass fiber content, and a rectifying device is added in the press, which can adjust the stroke of the cylinder if the net belt continues to run off so that the net the belt is always in the middle position.
Notes two points:
1. After each production must clean up the equipment, otherwise active roll, immersion roll on the accumulation of the diameter of the materials so that the net with easy to damage the equipment and Net;
2. Check that the belt is in the correct position after the belt is tensioned (the edge of the belt is approximately in the center of the Nylon Rod).
(8) after the above conditions are normal, the machine can be run empty to check whether there are any abnormal conditions;
(9) after the main machine is normal, the next scraper will be put to one-third of the material, start the main machine and swing switch, so that the resin can run under the yarn cutting roller, start the yarn cutting motor, the resin continued to function to the appropriate location, stop the cutting motor, and then put the material into the glue trough, start the synchronous switch, start production. When the main engine stops
working, all start-up devices must be restored to the static state; the production end must clear the squeegee slot and the whole set of equipment.
(10) each batch of sheet production should be in place to cut about 0.5 kg of sheet mark, ready for inspection

Resin paste production and connection of equipment

1. Resin paste production and equipment connection
1. The resin, low shrinkage, initiator, mold release agent, and Filler are ready. Resin, low shrinkage were placed on the scale of 1200 * 1200, connected by pipeline in 3-inch PNEUMATIC DIAPHRAGM, diaphragm
pump outlet pipe connected to two 2000L mixing tank top 3-inch pneumatic ball valve; The initiator is poured into a 50L stainless steel tank and placed on a 700 * 700 scale. It is piped to a 1-inch electric diaphragm pump. The outlet end of the DIAPHRAGM PUMP is piped to a 1-inch pneumatic ball valve at the top of two 2000L mixing pipes. (small bag) powder material, Zinc stearate (mold release agent) weight on the side of the feeder ready to use.
2. Open the upper end of the tank with a pneumatic ball valve, start the resin pneumatic diaphragm pump according to the weight into the tank, start low-speed mixing, and continue to add low-shrinkage agent, initiator, and other liquid material starts high-speed mixing, lasting 5 minutes; Open the three-way Valve (through a tank),
open the feeder, add demoulding agent, pack and stir for about 20 minutes, after mixing evenly open At the bottom of the mixing tank, a 4-inch ball valve flows to the filter tank through a pump into the online mixer. Meanwhile, can B can be filled and stirred.
2. Online blending
1. Connect the pigment to the C pump and the C pump outlet to the online mixer in a 100 l tank.
2. The MAGNESIA is then poured into a 100 l mixing tank, the bottom of the tube is connected to the B pump, and the B pump outlet is connected to the online mixer.
3. A, B, C pump, on-line mixer start at the same time, material mixing uniform flow into the material tank.

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Manhole cover thieves ‘may get death sentences’ in China https://summiteg-group.com/manhole-cover-thieves/ https://summiteg-group.com/manhole-cover-thieves/#respond Wed, 26 Aug 2020 11:16:12 +0000 https://www.devsnews.com/wp/bildpress/?p=109 China’s top judicial bodies have introduced strict punishments for those who remove or damage manhole covers, with the maximum sentence being the death penalty, it’s reported. The Supreme People’s Court, The Supreme People’s Procuratorate and the Ministry of Public Security have issued a joint statement, instructing courts to penalise people more strictly if they have been found to steal or damage manhole covers, the official People’s Daily reports. The statement said that the removal or destruction of manhole covers was sufficient for people to be charged with either “endangering transportation”, or “endangering public safety”. The maximum penalty for both of these charges is the death sentence. The official People’s Daily said that it was of the view of the highest legal powers that “the theft or destruction of manhole covers on the road… is sufficient to overturn/destroy a car or tram”.

‘Manhole maniacs’
Wan Chun, a senior official at China’s highest agency responsible for prosecution, explained the move, saying: “Manhole covers are often ignored, but they very much relate to people’s lives, personal safety and property security”.

“Stealing or destroying a manhole cover cannot be just identified as committing crimes of theft or destroying property. Instead, the offenders should be given harsher punishment.” The guideline also stipulates that those who work in state organs could also be charged with “crimes of dereliction of duty and abuse of power”, the official Xinhua News Agency says.

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5 Fun Facts About Manhole Covers https://summiteg-group.com/5-fun-facts-about-manhole-covers/ https://summiteg-group.com/5-fun-facts-about-manhole-covers/#respond Wed, 26 Aug 2020 11:13:52 +0000 https://www.devsnews.com/wp/bildpress/?p=111 Unique Manhole Cover Facts You Didn’t Know

Manhole covers are one of the most overlooked pieces of street infrastructure, but they play a crucial role in keeping people safe. Here are five fun facts about manhole covers.

Fact #1: Manhole Covers Can Weigh Hundreds of Pounds

This is why it’s vital for them to be adequately secured—so they don’t cause severe damage or injury. Their weight can be attributed to the cast iron or other heavy metal materials used to create them.

Fact #2: NYC Held the Oldest Manhole Cover in the USA

In 1840, the oldest manhole cover in the USA was installed to allow access to the Croton Aqueduct. Unfortunately, this manhole cover was removed in 2018 but sat in that spot for over 150 years.

Fact #3: The Earliest Manhole Covers Can Be Traced Back to the Roman Empire

The very first manhole covers can be traced back to the 1st Century AD. In fact, Romans used slabs of rock or pieces of wood to cover the entryway to underground trenches that carried sewage—similar to what we use them for today.

Fact #4: There are 350K Manhole Covers in NYC

According to the NYC Department of Environmental Protection, there are roughly 350,000 manhole covers across all five boroughs. NYC is the home of some of the oldest manhole covers in the country, with several created in the 1800s to bring fresh drinking water to the city’s residents.

Fact #5: Japan Has a Large Manhole Cover Art Community

Manholes are often just an afterthought when it comes to city planning and construction. However, in some cities around the world, manholes are treated with the same level of importance as other aspects of the urban landscape. One example is Japan, where they hold contests to choose the best manhole cover design. Manhole covers in Japan are often decorated with elaborate designs that reflect the local culture and history. In some cases, the manhole cover art is used as a form of self-expression by local artists.

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