Heat balance system for cross beam of press vulcanizer

Abstract

The cross beam heat balance system comprises an upper cross beam, a lower cross beam, a circulating water pump, a water tank, a condensed water recovery tank and the like, softened water is pumped from the high-temperature surface of the cross beam of the press vulcanizer, absorbs heat, reduces the temperature of the high-temperature surface, enters the low-temperature surface, releases heat and improves the temperature of the low-temperature surface, so that the temperature difference between the high-temperature surface and the low-temperature surface of the cross beam is balanced, deformation caused by uneven heating of the cross beam is reduced, and the quality of vulcanized products is improved. Along with the increase of the cycle index, the water temperature can rise, the balance effect is weakened, the system can automatically discharge and supplement water when the temperature rises to the set temperature, the discharged softened water is introduced into the condensed water recycling tank and is recycled together with condensed water generated by vulcanization steam, waste is reduced, the temperature of the condensed water can be reduced by discharging the softened water, and the energy consumption is reduced. Dead steam discharge of the condensed water recovery tank is reduced, and energy is saved. The cross beam heat balance system of the press vulcanizer has the characteristics of good heat balance effect, energy conservation, environmental protection, convenience in maintenance, high stability and the like.

Description

Technical Field

[0001] The invention relates to the technical field of rubber conveyor belt vulcanization, and in particular to a crossbeam thermal balance system of a flat plate vulcanizing machine. Background Art

[0002] In the past, in view of the temperature difference of about 100℃ between the high-temperature surface and the low-temperature surface of the conveyor belt flat vulcanizer beam, superheated water, heated heat transfer oil, steam and other media were used to heat the low-temperature surface, so that the temperature of the high and low-temperature surfaces were kept above 150 degrees Celsius to reduce the deformation of the beam; there was also a scheme of using normal temperature circulating water to cool the high-temperature surface of the beam, connecting from the normal temperature circulating water supply pipe and then discharging into the normal temperature circulating water return pipe; or using softened water for cooling, and then discharging the cooling water into the normal temperature circulating water pipe. These schemes either have high energy consumption and poor workshop environment, or have problems such as easy scaling of the beam circulation channel, waste of softened water, and increase of factory cold load. In response to these problems, this flat vulcanizer beam heat balance system is to provide a system that reduces waste, saves energy, is environmentally friendly, simple to maintain, and reliable in operation. Summary of the invention

[0003] The purpose of the invention is to solve the problems of environmental unfriendliness, energy waste, maintenance difficulty, etc. of a heat balance system of a cross beam of a rubber conveyor belt vulcanizer, and to provide a heat balance system of a cross beam of a rubber conveyor belt vulcanizer.

[0004] The technical solution of the present invention is achieved in the following manner:

[0005] A heat balance system for a crossbeam of a flat plate vulcanizing machine comprises an upper crossbeam, a lower crossbeam, an upper heating plate, a lower heating plate, a heat insulation pad, a drain valve, a steam pipe, a condensate pipe, etc.; the steam pipe, the upper heating plate, the lower heating plate, the drain valve and the condensate pipe constitute the heating system of the flat plate vulcanizing machine, the heat insulation pad is made of nylon material and plays a heat insulation role, and the characteristic is that the system is also provided with a softened water pipe, a water tank, a circulating water pump, an on-site liquid level gauge, a liquid level transmitter, a liquid level control box, a condensate recovery tank, a condensate pump, a drainage pneumatic valve, a drainage controller, and a temperature transmitter; the circulating water pump pumps normal temperature softened water from the high-temperature surfaces of the upper crossbeam and the lower crossbeam of the flat plate vulcanizing machine, absorbs heat while reducing the temperature of the high-temperature surface, and then enters the low-temperature surface to release heat to increase the temperature of the low-temperature surface, thereby balancing the temperature difference between the high and low-temperature surfaces of the crossbeam, reducing the deformation caused by uneven heating of the crossbeam, and improving the quality of the vulcanized product. As the number of cycles increases, the water temperature also increases accordingly, and the cooling effect on the high-temperature surface of the beam gradually weakens. When the temperature rises to the set temperature, the drainage pneumatic valve automatically opens to discharge the over-temperature circulating water, and the softened water in the water tank is automatically replenished to ensure the normal operation of the system. The discharged softened water is connected to the condensate recovery tank. The condensate recovery tank not only temporarily stores the condensate generated by the flat vulcanizer heating system, but also receives the heat balance over-temperature softened water, which avoids the waste of softened water or increases the heat load of the factory, and is also conducive to reducing the temperature in the condensate recovery tank, reducing the emission of exhaust steam, and saving energy. The condensate mixed with softened water is automatically pumped through the condensate pump and recycled for boiler replenishment and other purposes.

[0006] Preferably, the upper hot plate and the lower hot plate of the flat vulcanizer are heated by saturated steam, and the generated condensed water is collected by a condensed water recovery tank.

[0007] Preferably, the heat balance circulating medium of the upper crossbeam and the lower crossbeam is softened water.

[0008] Preferably, the softened water is pressurized by a circulating water pump and sent into the high-temperature surfaces of the upper and lower beams through a pipe, then flows into the low-temperature surfaces of the upper and lower beams, and then returns to the inlet of the circulating water pump after being collected, and circulates continuously to balance the temperature difference between the high-temperature surface and the low-temperature surface of the beam and reduce deformation caused by uneven heating.

[0009] Preferably, a temperature transmitter is arranged near the inlet of the circulating water pump to transmit the temperature signal of the heat-balanced circulating softened water to the drainage controller. The opening and closing of the drainage pneumatic valve is controlled according to the temperature setting of the drainage controller. When the temperature exceeds the upper limit of the set value, the drainage is started. As the softened water in the water tank is continuously replenished, the drainage is closed when the water temperature drops to the lower limit.

[0010] Preferably, the outlet of the drainage pneumatic valve is connected to a condensate recovery tank and mixed with the condensate from the hot plate heating system for collection, which can lower the temperature of the condensate recovery tank, reduce exhaust steam emissions, and facilitate the recycling of waste heat and softened water resources.

[0011] Preferably, the water tank is used to automatically store softened water and replenish water to the beam heat balance system by its own weight. The water level in the water tank is controlled by a water replenishment pneumatic valve, a liquid level transmitter and a liquid level control box, and a softened water pipeline supplies water to the water tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of a heat balance system of a crossbeam of a flat vulcanizing machine of the present invention.

[0013] Figure 2 It is a schematic diagram of the upper crossbeam and the lower crossbeam of the present invention.

[0014] The symbols in the figure are as follows:

[0015] 1. Condensate recovery tank; 101. Condensate pump; 102. Local level gauge; 103. Liquid level transmitter; 104. Liquid level control box;

[0016] 2. Drainage pneumatic valve;

[0017] 3. Drainage controller;

[0018] 4. Upper hot plate drain valve;

[0019] 5. Lower hot plate drain valve;

[0020] 6. Lower beam;

[0021] 7. Lower hot plate;

[0022] 8. Place the hot plate;

[0023] 9. Upper beam;

[0024] 10. Condensate pipe;

[0025] 11. Softened water pipeline;

[0026] 12. Steam pipes;

[0027] 13. Temperature transmitter;

[0028] 14. Circulating water pump;

[0029] 15. Insulation pad;

[0030] 16. Water tank; 1601. Local level gauge; 1602. Level transmitter; 1603. Level control box; 1604. Water supply pneumatic valve; 1605. Check valve;

[0031] 001, low temperature surface of upper beam; 002, high temperature surface of upper beam; 003 high temperature surface of lower beam; 004 low temperature surface of lower beam;

[0032] The arrow “→” indicates the flow direction of the medium;

[0033] The solid lines connecting the devices and valves are system pipelines, and the dotted lines connecting the instruments are control loops. DETAILED DESCRIPTION

[0034] The following is combined with the embodiments and the attached Figure 1 The present invention is described in detail:

[0035] Embodiment, a flat plate vulcanizing machine crossbeam heat balance system, which is provided with a condensate recovery tank 1, a condensate pump 101, an on-site liquid level meter 102, a liquid level transmitter 103, a liquid level control box 104, a drainage pneumatic valve 2, a drainage controller 3, an upper hot plate drain valve 4, a lower hot plate drain valve 5, a lower crossbeam 6, a lower hot plate 7, an upper hot plate 8, an upper crossbeam 9, a condensate pipeline 10, a softened water pipeline 11, a steam pipeline 12, a temperature transmitter 13, a circulating water pump 14, an insulation pad 15, a water tank 16, an on-site liquid level meter 1601, a liquid level transmitter 1602, a liquid level control box 1603, a water replenishment pneumatic valve 1604, and a check valve 1605. Each device and valve is connected by a pipeline, and the instruments are connected by electrical lines.

[0036] For the convenience of explanation, the beams are supplemented with numbers: upper beam low temperature surface 001, upper beam high temperature surface 002, lower beam high temperature surface 003, lower beam low temperature surface 004.

[0037] When the flat vulcanizer is vulcanizing the conveyor belt, the vulcanizing steam pressure is generally around 4 kg, and the temperatures of the upper hot plate 8 and the lower hot plate 7 are both higher than 150°C. Although the insulation pad 15 will reduce heat transfer, the temperatures of the upper beam high temperature surface 002 and the lower beam high temperature surface 003 will also reach around 150°C, while the temperatures of the upper beam low temperature surface 001 and the lower beam low temperature surface 004 are around 50°C, resulting in a temperature difference of around 100°C between the high temperature surface and the low temperature surface of the beam. In order to smooth out this temperature difference, it is necessary to process a circulation channel that is connected end to end in some areas of the high temperature surface and the low temperature surface of the beam, and pass the corresponding circulation medium to achieve this.

[0038] In this embodiment, the heat balance circulating medium of the upper crossbeam 9 and the lower crossbeam 6 is softened water at room temperature. The softened water is pressurized by the circulating water pump 14 and sent to the high temperature surface 001 of the upper crossbeam and the high temperature surface 003 of the lower crossbeam through a pipeline, absorbs heat and reduces the temperature of the high temperature surface, and then flows into the low temperature surface 001 of the upper crossbeam and the low temperature surface 004 of the lower crossbeam respectively, releases heat and increases the temperature of the low temperature surface, and then is collected and returned to the inlet of the circulating water pump 14, and circulates continuously, thereby balancing the temperature difference between the high and low temperature surfaces of the crossbeam, so as to reduce the deformation caused by uneven heating of the crossbeam and improve the quality of the vulcanized products.

[0039] To ensure the balancing effect, the temperature of the circulating water needs to be limited. In this example, the water temperature is set between 65°C and 45°C. A temperature transmitter 13 is set near the inlet of the circulating water pump 14 to transmit the thermal balance circulating softened water temperature signal to the drainage controller 3. According to the temperature setting of the drainage controller 3, the opening and closing of the drainage pneumatic valve 2 is controlled. When the temperature exceeds the upper limit of the set value, the drainage is started. As the softened water in the water tank 16 is continuously replenished, the drainage is closed when the water temperature drops to the lower limit.

[0040] The condensate generated by steam heating of the upper hot plate 8 and the lower hot plate 7 is collected by the condensate recovery tank 1, instead of being directly discharged into the condensate pipeline 10, which is conducive to reducing the back pressure of the upper hot plate steam trap 4 and the lower hot plate steam trap 5, and ensuring the steam heating effect. The outlet of the drainage pneumatic valve 2 is also connected to the condensate recovery tank 1, and the discharged over-temperature softened water is mixed with the condensate, which is conducive to lowering the internal temperature of the condensate recovery tank 1 and reducing the discharge of exhaust steam. The liquid level of the condensate recovery tank 1 is automatically controlled by the liquid level transmitter 103 and the liquid level control box 104, and the condensate pump 101 pumps the condensate into the condensate pipeline 10 and sends it to the boiler room for use as boiler water supply and replenishment.

[0041] While the over-temperature softened water is discharged, the softened water stored in the water tank 16 replenishes water to the heat balance system by its own weight, and a check valve 1605 is provided in the water replenishment pipeline to prevent hot water from flowing back into the water tank 16. The water level of the water tank 16 is controlled by the water replenishment pneumatic valve 1604, the liquid level transmitter 1602 and the liquid level control box 1603, and is automatically maintained at the set water level. The softened water pipeline 11 supplies water to the water tank 16.

[0042] Before the system works, the high and low liquid levels of the condensate recovery tank 1 and the water tank 16 must be set respectively through the liquid level control box 104 and the liquid level control box 1603 according to the design, and the working temperature range of the circulating softened water in the heat balance system must also be set. The discharge temperature set in this embodiment is 65°C and the discharge stop temperature is 45°C.

[0043] By adopting this heat balance system for the crossbeam of the flat vulcanizing machine, the temperature difference between the high temperature zone and the low temperature zone of the crossbeam is small, the deformation of the crossbeam is small, the quality of the vulcanized conveyor belt products meets the design requirements, the workshop environment is good, the system maintenance is simple, and the operation is reliable. After the condensed water produced by vulcanization enters the condensate recovery tank 1, it is cooled by the softened water discharged by the heat balance system, which also significantly reduces the exhaust steam emission in the condensate recovery tank 1. The condensed water and softened water collected in the condensate recovery tank 1 are finally sent to the boiler room as a supplement to the boiler water supply, and the recovery and utilization rate of the softened water for circulating cooling and the waste heat of the system are significantly improved.

[0044] The above description is only a specific embodiment cited to clearly illustrate the present invention, and cannot be used to limit the scope of implementation of the present invention. Any obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A heat balance system for a crossbeam of a flat plate vulcanizer, comprising an upper crossbeam, a lower crossbeam, an upper heating plate, a lower heating plate, a heat insulation pad, a steam trap, a steam pipe, a condensate pipe, etc.; the steam pipe, the upper heating plate, the lower heating plate, the steam trap and the condensate pipe constitute the heating system of the flat plate vulcanizer, and the heat insulation pad is made of nylon material to play a heat insulation role, characterized in that: The system is also provided with a softened water pipeline, a water tank, a circulating water pump, an on-site liquid level meter, a liquid level transmitter, a liquid level control box, a condensate recovery tank, a condensate pump, a drainage pneumatic valve, a drainage controller, and a temperature transmitter. The circulating water pump pumps room temperature softened water from the high-temperature surfaces of the upper beam and the lower beam of the flat vulcanizer, absorbs heat while lowering the temperature of the high-temperature surface, and then enters the low-temperature surface to release heat and increase the temperature of the low-temperature surface, thereby balancing the temperature difference between the high and low-temperature surfaces of the beam, reducing the deformation caused by uneven heating of the beam, and improving the quality of the vulcanized product. As the number of cycles increases, the water temperature also increases accordingly, and the cooling effect on the high-temperature surface of the beam gradually weakens. When the temperature rises to the set temperature, the drainage pneumatic valve automatically opens to discharge the over-temperature circulating water. At the same time, the softened water in the water tank is automatically replenished to ensure the normal operation of the system. The discharged softened water is connected to the condensate recovery tank, which is conducive to lowering the temperature in the condensate recovery tank, reducing the emission of condensate exhaust steam, and saving energy; the condensate mixed with softened water can be recycled for purposes such as boiler make-up water.

2. A heat balance system for a crossbeam of a flat vulcanizing machine according to claim 1, characterized in that: The upper hot plate and the lower hot plate of the flat vulcanizer are heated by saturated steam, and the generated condensed water is collected by a condensed water recovery tank.

3. A heat balance system for a crossbeam of a flat vulcanizing machine according to claim 1, characterized in that: The heat balance circulation medium of the upper crossbeam and the lower crossbeam is softened water.

4. A heat balance system for a crossbeam of a flat vulcanizing machine according to claim 1, characterized in that: The softened water is pressurized by the circulating water pump and sent to the high-temperature surfaces of the upper beam and the lower beam through the pipeline, and then flows into the low-temperature surfaces of the upper beam and the lower beam respectively, and then returns to the inlet of the circulating water pump after being collected, and the cycle repeats.

5. A heat balance system for a crossbeam of a flat vulcanizing machine according to claim 1, characterized in that: A temperature transmitter is arranged near the inlet of the circulating water pump to transmit the temperature signal of the heat-balanced circulating softened water to the drainage controller, and the opening and closing of the drainage pneumatic valve is controlled according to the temperature setting of the drainage controller.

6. A heat balance system for a crossbeam of a flat vulcanizing machine according to claim 3, characterized in that: When the softened water is discharged at an over-temperature, the outlet of the pipeline is connected to a condensate recovery tank for collection.

7. A heat balance system for a crossbeam of a flat vulcanizing machine according to claim 1, characterized in that: The water tank is used to automatically store softened water and replenish water to the heat balance system through its own weight. The water level of the water tank is controlled by a water replenishment pneumatic valve, a liquid level transmitter and a liquid level control box.

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