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Flat curing machine

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Flat vulcanizing machine is mainly used for vulcanizing flat type tape (such as conveyor belt, transmission belt, flat belt for short), which belongs to hydraulic machinery. The main function of flat vulcanizing machine is to provide the pressure and temperature required for vulcanization. The pressure is generated by a hydraulic system through a hydraulic cylinder, and the temperature is provided by a heating medium (usually steam, thermal oil, etc., superheated water is also useful).


1 Introduction

Flat vulcanizing machine is mainly used for vulcanizing flat type tape (such as conveyor belt, transmission belt, flat belt for short), which belongs to hydraulic machinery. The main function of flat vulcanizing machine is to provide the pressure and temperature required for vulcanization. The pressure is generated by a hydraulic system through a hydraulic cylinder, and the temperature is provided by a heating medium (usually steam, thermal oil, etc., superheated water is also useful).

Conveyor flat plate vulcanizing machine is mainly used for forming flat products such as vulcanized flat tape, rubber sheet, polymer and so on. It has the advantages of high pressure per unit area of hot plate, reliable equipment operation, and low maintenance. The temperature is provided by a heating medium (usually steam, thermal oil, etc.). According to the structure of the frame, the flat belt flat vulcanizing machine can be divided into two types: column flat belt flat vulcanizing machine and frame flat belt flat vulcanizing machine. According to the number of working layers, it can be divided into single layer and multi-layer: according to the hydraulic system. The working medium can be divided into oil pressure and water pressure.

In the rubber industry, the column type flat belt vulcanizing machine is an earlier model. Most of the flat belt plate vulcanizing machines used in China in the past were column structures, but currently they are mostly framed. Compared with column type flat belt vulcanizing machine, frame type flat belt vulcanizing machine has the following advantages: Under a certain center distance, it is allowed to install hydraulic cylinders with a larger diameter, which can reduce the number of hydraulic cylinders, and has a simple structure and maintenance. The load is small; the upper beam is reasonably stressed, and the required cross-sectional modulus is much smaller than that of the living type, which can reduce weight; the manufacturing and installation is simple, the pipeline configuration is hidden, and the overall appearance is neat and beautiful. The lateral rigidity of a single frame plate of a frame type flat belt vulcanizing machine is worse than that of a column, but because the frame of the frame type flat belt vulcanizing machine is composed of multiple frame plates, the entire machine has sufficient lateral rigidity. .

2 merit parameters

Advantages of flat vulcanizing machine

① Under a certain center distance, it is allowed to install hydraulic cylinders with larger diameters, which can reduce the number of hydraulic cylinders, and has a simple structure and less maintenance;

② The upper beam is reasonably stressed, and the required section modulus is much smaller than that of the column type, which can reduce weight;

③Simple manufacturing and installation, concealed pipeline configuration, neat and beautiful appearance of the whole machine.

3 technical parameters

The electric heating tube of the electric flat plate vulcanizing machine is mainly used for heating the template of the vulcanizing machine. It is made of stainless steel tube or ordinary iron tube. It is divided into single-head and double-headed tubes. Requirements for insulation and leakage current. The internal design uses high temperature magnesium oxide powder and anti-oxidation heating wire. If necessary, please consult the Golden Harbor Technology Department, choose high temperature resistant stainless steel pipes, fully consider the installation and use environment, and use special treatment for component sealing requirements. In order to meet customers' requirements for the safety and life of the heating elements of the equipment.

The technical parameters of the flat vulcanized electromechanical heat pipe are as follows: The working voltage of the single-headed heat pipe of the vulcanization model is 220 (V) or 380 (V). The power is produced according to the template and temperature. The common pipe diameters are 14mm, 16mm, 18mm, etc. The material can be SUS304 seamless tube. The vulcanization condition is template heating. The surface is polished and blackened. The sealing is glass sealing, epoxy resin, glue. The electrical performance is long-term insulation value is greater than 50MΩ, and the leakage current is less than 0.5mA.

The main technical requirements of the flat vulcanizing machine: the operating temperature is usually 180-200 ° C, the surface load of the conventional electric heating tube is 3-7W / cm2, to ensure the uniform surface temperature of the flat vulcanizing machine template, and the reasonable arrangement of the hole spacing of the template, The temperature difference of the surface of the hot plate is controlled in a small range, and the convenience of installation and use of the electric heating pipe is considered, and the star connection method is generally used.

Flat vulcanizing electromechanical heat pipe is an electric heating element specially designed for electric heating flat vulcanizing machine. Flat plate vulcanizer is the main vulcanization equipment for rubber products. The temperature difference between the hot plate surface is the main performance index of the flat plate vulcanizer. There are two main reasons for the large temperature difference on the surface of the hot plate: 1. the ambient temperature shadow; 2. electric heating The arrangement of the tube spacing is designed. Therefore, the key to solving the problem of the temperature difference on the surface of the hot plate of the electric heating plate curing machine is to find out the relationship between the small temperature difference and the arrangement of the distance between the electric heating pipes.

effect

The rubber flat vulcanizing machine is mainly used for vulcanizing flat type tape. It has the advantages of high pressure per unit area of the hot plate, reliable equipment operation and low maintenance. The main function of the flat vulcanizing machine is to provide the pressure and temperature required for vulcanization. The pressure is controlled by hydraulic pressure. The system is generated by a hydraulic cylinder, and the temperature is provided by the heating medium. There can be single and double layers according to the number of working layers: according to the working system of the hydraulic system, there can be oil pressure and water pressure.

In the flat vulcanizing machine rubber industry, the column flat flat plate vulcanizing machine is an earlier model.The flat belt flat vulcanizing machines used in China in the past are mostly column structures, but currently they are mostly framed structures. Compared with the column type flat belt vulcanizing machine, the frame type flat belt vulcanizing machine has certain advantages.

Equipment functions

1. The difference between the measurement points of the normal vulcanization time of the hot plate is controlled by ± 3 ° C.

2. Considering the uniformity of the heating temperature, each hot plate should be in and out of steam in multiple sections (7.7 meters in three sections), and a temperature sensor should be installed on each layer of hot plate.

3. On the console, the temperature display, pressure display and temperature and pressure alarm system of PLC touch screen are displayed. The temperature value deviation and pressure of each layer are prompted so that the operator can take appropriate measures.

4. The vulcanization temperature of the equipment can be controlled between 145-160 ° C, and the pressure can be controlled between 0.8Mpa and 24Mpa.

5. PLC and control system have the following functions:

(1) Store temperature, system pressure, and time data at each point of the vulcanization process.

(2) Display the current time-temperature, time-pressure on the same screen, and query historical data at any time in order to trace quality problems.

(3) The exhaust of the tread groove is smooth. The pressure during exhaust, the seconds during exhaust, and the number of exhausts can be set on the screen.

(4) The vulcanization and pressurization process can be divided into 6 steps and gradually pressurized after exhausting. The user can set the pressure value and interval of each step, and the entire vulcanization process is automatically completed after setting.

Model features

1. The moving template has the functions of fast rising, slow locking and fast falling. The mold closing fast turning slow and exhaust fast turning slow can be adjusted separately to improve production efficiency.

2. The oil pump motor stops working when the product is vulcanized, and it has an automatic pressure compensation function and the oil pump stop time delay. The oil circuit configuration is more reasonable and reliable.

3. The deflation time, the number of deflation times, the heating temperature, and the vulcanization time can be set, which is convenient to operate.

4. It has two working modes: automatic and semi-automatic. Set up routine vulcanizer working mode program I? Transfer mold working mode? Program II? Meet the process requirements of special rubber.

5. Advanced technology is applied to the hydraulic oil cylinder, which has a reliable seal and a long service life.

6. The electrical system adopts PC full computer control and full touch screen, which makes the control more convenient, accurate and reliable.

7. The hydraulic station adopts imported technology gear pump and medium and high pressure vane pump combination, hydraulic device, proportional pressure and flow compound valve control. Low noise and low energy consumption.

4 working principle

First, the working process

After inserting the non-vulcanized semi-finished product into the model, place the model in the gap between the two layers of hot plates (for non-model products such as tape and rubber plates, place directly between the hot plates). Then the hydraulic medium (oil or water) is passed into the hydraulic cylinder, and the plunger pushes the movable platform and the hot plate to move up or down, and pushes the movable plate to compact the mold or the product. During the above movement, the heating medium is passed into the heating plate, so that the model (or product) can obtain the pressure and temperature required for the vulcanization process. After a period of time (vulcanization cycle), the product is vulcanized. At this time, the The hydraulic medium is eliminated. Because the plunger drops under its own weight (or the hydraulic pressure of the double acting cylinder), the product can be taken out.

Working principle

When the plate vulcanizer is working, the hot plate heats up the rubber compound and cross-links the rubber molecules. Its structure changes from a linear structure to a net-shaped body structure. This is to obtain products with certain physical and mechanical properties, but the rubber compound After heating, it begins to soften, and at the same time, the moisture and volatile substances in the rubber material must be gasified. At this time, the hydraulic cylinder is used to give the rubber material sufficient pressure to fill the model, and the generation of air bubbles is restricted to make the product structure dense. To. If it is an adhesive layer product, it can make the adhesive stick to the cloth firmly. In addition, give enough pressure to prevent the mold from leaving the seam surface, such as flashing, pattern lack of glue, porosity and other phenomena.

classification

Due to the wide range of use of flat vulcanizers, there are many types of flat vulcanizers, which can generally be considered from the following different perspectives:

First, it can be divided according to different uses

1. Flat rubber vulcanizing machine for rubber molded products

2. Flat rubber flat vulcanizing machine

3. Rubber V-belt flat vulcanizing machine

4. Flat rubber vulcanizing machine

Second, according to the transmission system can be divided into

1.Hydraulic plate vulcanizing machine-(more applications)

2.Mechanical flat vulcanizing machine-(less applied)

3.Hydraulic mechanical plate vulcanizing machine

Three, according to the operating system can be divided into

1. Non-automatic plate vulcanizing machine

2.Semi-automatic plate vulcanizing machine

3.Automatic plate vulcanizing machine

Four, according to the heating method of the plate can be divided into

1.Steam heating plate vulcanizing machine-(commonly used in factories)

2. Electric heating plate vulcanizing machine-(Used in places without heat source or far away from heat source. Features are high temperature, easy to control, no leakage, but high cost. The experimental plate vulcanizing machine used in the laboratory is this heating method Flat vulcanizer.)

3. Super hot water heating plate vulcanizing machine-(commonly used in factories)

Five, according to the structure can be divided into

1. According to the structure of the frame, it can be divided into column type, frame type, side plate type, connecting rod type, and rotary flat plate vulcanizing machine.

2. According to the number of heating layers of the heating plate, it is divided into: single-layer and multi-layer plate vulcanizing machine

3. According to the number of hydraulic cylinders, it is divided into: single hydraulic cylinder and multi-hydraulic cylinder flat vulcanizing machine

4. According to the position of the hydraulic cylinder, it is divided into: upper cylinder type and lower cylinder type plate vulcanizing machine; vertical and horizontal plate type vulcanizing machine.

5 Maintenance

The vulcanizing machine is used as a joint tool of the conveyor belt. During and after use, it should be maintained and maintained like other tools to extend the service life. At present, as long as the curing machine produced by our company is used properly, its service life is 8 years.

The following issues should be paid attention to during the maintenance of the curing machine:

1.The storage environment of the vulcanizing machine should be kept dry and well ventilated to avoid the electrical circuits being wet due to humidity;

2. Do not use the vulcanizer outdoors on rainy days to prevent water from entering the electric control box and heating board;

3. If the working environment is humid and watery, when dismantling and transporting the vulcanizing machine, it should be elevated on the ground with objects, and do not let the vulcanizing machine directly contact the water;

4. If the heating plate enters water due to improper operation during use, first contact the manufacturer for repair. If emergency repairs are required, open the cover on the heating plate, pour out the water, and then set the electric control box to manual operation. Warm up to 100 ° C, keep the temperature constant for half an hour, and dry the line. Glue the belt in manual mode. At the same time, the manufacturer should be contacted in time for the overall replacement of the line.

5. If the vulcanizing machine is not used for a long time, the heating plate should be heated every half month (the temperature is set at 100 ° C), and the temperature should be kept for about half an hour.

6. After each use, the water in the water pressure plate should be cleaned, especially in winter. If the water can not be cleaned, it often leads to premature aging of the water pressure plate rubber, which reduces the service life of the water pressure plate.

The correct way of discharging water is after the vulcanization and heat preservation is over and before the vulcanizing machine is disassembled. If the water is discharged after the machine is disassembled, the water in the hydraulic plate may not be completely discharged.

Safe operation

1. Wear protective equipment during operation. Do not use wet gloves.

2. Preheat the plate before vulcanization, and check whether there is any foreign matter between the layers and whether the other parts are normal. -

3. The pressure gauge and thermometer should be sensitive and effective. According to the safety and process conditions, strictly control the steam pressure, oil pressure and vulcanization temperature.

4. When loading the vulcanization mold, do not put your hand into the flat room to prevent hot hands or crushing. If you find a problem, you should stop and handle it. The mold used should be placed stably to prevent injury from falling.

5. After the operation is completed, cut off the power, close the water and gas valves, and return the mold to the designated place.

Precautions

1. For the machine operated by the solenoid valve, the operator must not disturb the solenoid valve. In the event of a failure, it must be repaired by electrical and instrument personnel. Before the repair, the power must be cut off.

2. When starting the pull-out machine and the splint, contact the bell and yell first. Do not start without a reply. During operation, do not reach into the splint. Non-local personnel should not arbitrarily push on the splint or press the button. When the front and rear pull-out machine is started, the operator is 0.5 meters away from the roller.

3. When changing the horns, be stable and accurate, and do not use too much force. Before changing the horns in series, you must notify the people around the pot to flash away to prevent injury.

4. When picking the top iron, it must be carried out after the middle hot plate and the upper hot plate are completely separated. After all the top irons have been picked up, the iron plate can be lowered.

5. It is strictly forbidden to put your hand into the pot when turning the iron plate under the pot. When the pot is hot, do not put your hand between the hot plate and the hot plate within 10 cm.

6. When holding the iron rods used for coiling the finished product, hold them firmly and firmly. When walking, pay attention to underground obstacles, and pay attention to avoid injury to hands and feet.

7. When starting the packaging machine, check before and after to prevent injury. When leading the lead, the two must be 0.5 meters away from the roller. Cooperate well with each other, and then drive after driving.

8. When lifting the finished product, first check whether the wire rope is damaged. When lifting, you must first send a signal to transfer the goods below, and no one is allowed to stand. When lifting semi-finished products, the wire rope must be hung in the groove of the take-up roll.

9. When hoisting the semi-finished product on the guide frame, two people must operate it. The direction of the notch on the two sides of the guide frame must be the same. After placing it, block the card sleeve.

10. When using an electric drill or pot cleaner, you must first check whether it is safe and reliable, and whether the electrical wiring is damaged. If you find a problem, you must repair it before using it.

11. When transporting the pot cleaner, several people should cooperate with each other and hold it firmly. When changing the sandpaper, the screws must be tightened tightly, and the electrical switch must be responsible for preventing accidents.

12, vulcanized nylon conveyor belt, cold time is not allowed to pass under the long belt.

References

Reference editing area



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