CN105773950B - Optical cable extruding machine heat-insulation system - Google Patents

Abstract

The invention provides a thermal insulation system for an optical cable extruder, which includes a time relay, a temperature control unit, and a temperature sensing unit, and the time relay and the temperature sensing unit are respectively connected to the temperature control unit through a circuit, and the time relay records the shutdown time, and When the shutdown time exceeds the shutdown time limit, the temperature control unit switches the temperature setting value of each temperature zone of the extruder from the extrusion temperature to the drying temperature. When the temperature drops to the drying temperature, each temperature zone enters the heat preservation state; When it is necessary to start up, the temperature control unit switches the temperature setting value of each temperature zone from the drying temperature to the extrusion temperature. When the temperature in each temperature zone reaches the extrusion temperature, the extruder is ready to start. Among them, the shutdown time limit is It is determined according to the heat-resistant plasticizing time of different extrusion materials. The thermal insulation system can quickly heat up to the production temperature, improve production efficiency; prolong the service life of the screw; and reduce power consumption.

Description

Optical cable extruder insulation system

technical field

The invention relates to the technical field of optical cable processing, in particular to a thermal insulation system for an optical cable extruder.

Background technique

Optical cable production uses a single-screw extruder. The single-screw is generally divided into a conveying section, a compression section, and a metering section in terms of effective length. The screw needs to heat the material in the barrel during work. In most cases, there are 4 to 5 temperature zones in the barrel of the extruder, and 2 to 4 temperature zones in the head of the extruder. When the extruder is working, each temperature zone needs to maintain a temperature that meets the properties of the extruded material. Each temperature zone needs a heating process to reach the required set temperature. The resistance coil heating method is slow, the heat dissipation is slow, and the power consumption is large. Generally, it takes more than 2 hours. For the cable industry with continuous production, if the extruder is shut down for a short time, if the heating devices in each temperature zone of the extruder are turned off and reheated during use, the production efficiency will obviously be reduced. However, if the heating devices in each temperature zone are not turned off and they are in a heating state for a long time, the material between the screw and the barrel is in a plasticized state for a long time, and it is easy to carbonize. The carbonized material can easily penetrate into the screw or be firmly adsorbed on the screw, resulting in a change in the volume of the screw groove, and increasing the viscosity of the material during extrusion, which will cause unstable pressure in the compression section and inaccurate measurement in the metering section. Finally, it will affect the extrusion effect of the extruder and shorten the service life of the screw.

Fig. 1 is the temperature control flowchart of the optical cable extrusion machine in the prior art, and it comprises the following steps:

Step S10, shutting down the extruder.

Step S20, at this time, the temperature of each temperature zone is the set value A of the extrusion temperature of the material.

Step S30, judge whether to turn off the heating device, if yes, execute S40, otherwise execute S50, do not turn off the heating device, S501, keep the actual temperature of each temperature zone at the extrusion temperature set value A.

Step S40, manually turning off the heating device.

Step S401, the temperature setting value of each temperature zone is switched to 0.

In step S402, the actual temperature of each temperature zone drops to the ambient temperature after time T1.

Step S403, judging whether to power on, if yes, execute S405, otherwise execute S404, do not power on, and maintain the current state.

Step S405, manually setting the temperature of each temperature zone as the extrusion temperature setting value A.

In step S406, the temperature of each temperature zone reaches the set value A of the extrusion temperature after a time T2 elapses from the ambient temperature.

Step S60, start the machine.

Step S70, the extruder is started.

It can be seen that when the extruder is shut down, if the extrusion temperature zones are still heating, the extruder will always maintain the temperature setting value A that keeps the material in the extrusion state, and the extruder can enter the production state when it is turned on at any time. However, electric energy is wasted, and it is easy to cause carbonization of the material in the plasticized state in the screw barrel for a long time, which affects the extrusion effect and reduces the service life of the screw. If the heating device is turned off, the temperature of each temperature zone of the extruder is switched from the set value A to the set value 0, that is, the heating device stops heating, and the temperature value of each temperature zone of the extruder elapses from the temperature setting value T1 A is lowered to ambient temperature. If it is not turned on, the ambient temperature will always be maintained. If starting the machine, the heating device will heat each temperature zone to the temperature setting value A by the ambient temperature again, and the heating time is T2, and its production efficiency is low.

Contents of the invention

The invention provides a thermal insulation system for an optical cable extruder to solve the problems of low efficiency or high power consumption when the optical cable extruder is restarted after shutdown, continuous heating shortens the life of the screw, and the like.

According to one aspect of the present invention, a thermal insulation system for an optical cable extruder is provided, including a time relay, a temperature control unit, and a temperature sensing unit, wherein the temperature control unit also includes an extrusion material determination unit and an extrusion temperature determination unit, And the time relay and the temperature sensing unit are respectively connected to the temperature control unit through the circuit. The temperature sensing unit transmits the temperature value measured in real time to the temperature control unit. When the extruder stops, the time relay starts to record the shutdown time. Exceeding the shutdown time limit, the temperature control unit will switch the temperature setting value of each temperature zone of the extruder from the extrusion temperature of the extruded material to the drying temperature of the extruded material, when the temperature drops to the drying temperature of the extruded material , each temperature zone enters the heat preservation state; when it is necessary to start the machine, the extrusion material determination unit learns the type of extrusion material in the extruder, and sends a signal to the extrusion temperature determination unit. In the plastic temperature parameter table, the temperature setting value of each temperature zone is switched from the drying temperature of the extruded material to the extrusion temperature of the extruded material. When the temperature of each temperature zone reaches the extrusion temperature of the extruded material, the extruder The start-up conditions are met, wherein the stop time limit is determined according to the heat-resistant plasticizing time of different extrusion materials.

Optionally, a protection unit is also included. If the temperature of each temperature zone of the extruder does not reach the extrusion temperature of the extruded material, the protection unit prohibits the extruder from starting.

Optionally, when the temperature control unit switches the extruder from the heat preservation state to the heating state, the time relay is cleared.

Optionally, the shutdown time limit of the PE material is 1.5 hours.

Optionally, the downtime limit of the PVC material is 0.5 hours.

Optionally, the shutdown time limit of the PP material is 0.25 hours.

Optionally, the shutdown time limit of the flame retardant material is 0.5 hours.

Optionally, the temperature control unit also has a temperature control switch for controlling the opening or closing of the heating device. The temperature control switch has a heating gear, a stop gear, and a mold changing gear. By switching gears or pulling and starting, the extrusion is controlled. The heating state of the machine.

Optionally, when the extruder is started in the heat preservation state, the temperature control switch is first switched from the heating gear to the stop gear or the mold change gear, and then switched back to the heating gear, and the extruder enters the heating state.

Optionally, the extruder is activated by pulling into the heating state.

The thermal insulation system of the optical cable extruder of the present invention pre-sets the thermal insulation temperature and shutdown time limit of each temperature zone according to the characteristics of different materials, and each temperature zone of the extruder can automatically enter the thermal insulation state according to the set shutdown time limit. After the heating of each temperature zone is stopped, reheating from the ambient temperature to the extrusion temperature is a waste of time; on the other hand, it is avoided that each temperature zone is kept at the extrusion temperature, and the carbonized material is adsorbed on the screw, which affects the extrusion effect and shortens the use of the screw. life.

Description of drawings

The above features and technical advantages of the present invention will become clearer and easier to understand by describing its embodiments in conjunction with the following drawings.

Fig. 1 shows the temperature control flowchart of the optical cable extrusion machine that prior art relates to;

Fig. 2 is a schematic diagram showing the thermal insulation system of the optical cable extruder involved in the embodiment of the present invention;

Fig. 3 is a schematic diagram showing a temperature control unit involved in an embodiment of the present invention;

Fig. 4 is a flow chart showing the control of the thermal insulation system of the optical cable extruder according to the embodiment of the present invention.

detailed description

Embodiments of the thermal insulation system for an optical cable extruder according to the present invention will be described below with reference to the accompanying drawings. Those skilled in the art would recognize that the described embodiments can be modified in various ways or combinations thereof without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims. Also, in this specification, the drawings are not drawn to scale, and like reference numerals denote like parts.

This embodiment provides a thermal insulation system for an optical cable extruder. As shown in FIG. It is connected with the temperature control unit. When the extruder stops, the time relay starts to record the downtime. When the downtime exceeds the set stop time limit, the temperature control unit switches the temperature of the extruder from the extrusion temperature of the material to the temperature of the material. Drying temperature, and control the heating device to reduce the temperature to the drying temperature, and keep warm after reaching the drying temperature; when the extruder needs to be turned on, the temperature control unit will adjust the temperature of each temperature zone from the drying temperature of the material to the drying temperature of the material. extrusion temperature. Among them, the shutdown time limit is determined according to the heat-resistant plasticizing time of different materials. As shown in FIG. 3 , more specifically, the temperature control unit 4 further includes an extrusion material determination unit 41 and an extrusion temperature determination unit 42 . The extrusion material determination unit 41 is used to determine the type of material in the extruder and send a signal to the extrusion temperature determination unit 42. The extrusion temperature determination unit 42 determines the type of material in the extruder in conjunction with the extrusion temperature parameter table. Extrusion temperature setpoint.

The stop of the extruder is the trigger condition of the time relay. When the extruder is running, the time relay does not work. The extruder is shut down, such as work handover, equipment maintenance, etc. At this time, the extruder needs to be shut down, and the time relay starts to record the time from the shutdown of the extruder. The present embodiment will be described in detail below with reference to the flowchart of FIG. 4 .

Step S100, stop the extruder. S200, at this time, the temperature setting value of each temperature zone is still maintained at the temperature when the extruder is working, even if the material reaches the temperature setting value A of the extrusion condition, it should be noted that when the extruder is operating normally Different temperature setting values in each temperature zone are collectively referred to as temperature setting value A.

Step S300, the time relay starts timing.

Step S400, when the shutdown time reaches the set shutdown time limit, then step S500, the time relay sends a signal to the temperature control unit to switch the temperature of each temperature zone from the extrusion temperature setting value A to the heat preservation temperature setting value B. Wherein, the temperature setting value B is the temperature value at which the material in the extruder reaches the drying state.

In step S600, the temperature control unit starts to adjust the heating device to lower the temperature, and the extruder decreases from the extruding temperature value during normal operation to the temperature setting value B after T3 time.

Step S700, after the temperature value B is reached, the temperature control unit switches the extruder to the heat preservation state. At this time, S800, the extruder is in a protection state, and the extruder cannot be started. Since the extrusion temperature and drying temperature of different materials are different, the shutdown time limit is determined according to the heat-resistant plasticizing time of different extrusion materials, and the shutdown time limit and the extrusion temperature value of each material are controlled by temperature. The extrusion material determination unit and the extrusion temperature determination unit of the unit are determined according to Table 1.

Step S900, judging whether to power on, if not, then S9001, keep the current temperature state. When production is required, then S9002, after the temperature control unit obtains the start-up command, the temperature control unit controls the heating device to keep the extruder in a heating state. After the extrusion material determination unit knows the type of material in the extruder, it sends a signal to the extrusion temperature determination unit, and the extrusion temperature determination unit determines the extrusion temperature setting according to the type of material in the extruder and in combination with the extrusion temperature parameter table. Fixed value A.

In step S9003, the actual temperature values of each temperature zone reach the set value A of the extrusion temperature after time T3, and the start-up condition is met at this time.

At this point, step S9004 can be executed to perform a power-on operation.

Step S9005, the extruder is started.

Combined with the above, it is obvious that T2>T1>T3, it can be seen that the extruder without insulation system takes a long time to heat up to the temperature required for production. The extruder with heat preservation system can reach the temperature required for production in a shorter time.

This embodiment uses a temperature control unit, combined with a temperature sensing unit and a time relay, to determine the shutdown time limit according to the heat-resistant plasticization time of different extrusion materials. If the shutdown time exceeds the heat-resistant plasticization time of the material, the temperature control unit will The plastic machine switches to the low temperature heat preservation state. In this way, damage to the screw due to prolonged heating and penetration of the screw by the carbonized extruded material are prevented, the service life of the screw is prolonged and the power consumption is effectively reduced. The conventionally used Φ90 sheathed extruder has 9 temperature zones and a comprehensive heating power of 40.5 kilowatts. Using the automatic heat preservation system, both the heating time and the heat preservation process can effectively reduce the power consumption, and effectively reduce the heating time by more than 50%.

In an optional embodiment, as shown in FIG. 2 , the heat preservation system further includes a protection unit 5 , which is connected to the temperature control unit 4 through a circuit, and controls the extruder 1 in feedback. When starting up, the protection unit detects whether the temperature control unit switches the temperature of each temperature zone from the drying temperature to the extrusion temperature, and combines the temperature value detected by the temperature sensing unit to judge whether the temperature of each temperature zone reaches the extrusion setting temperature value. If the temperature control unit does not switch the temperature setting value of the temperature zone to the extrusion temperature, the protection unit prompts the temperature control unit to switch and prohibits the extruder from starting. And when the set temperature of the extruder does not reach the set value A, the temperature control unit also prohibits the extruder from starting. In this way, due to the negligence of the operator, starting the extruder when the extrusion temperature does not reach the extrusion temperature will prevent the extruder from being damaged.

The extrusion materials used in the optical cable extruder include PE material, PVC material, PP material and flame retardant. Table 1 is the extrusion temperature parameter table, including extrusion temperature, drying temperature, heat resistance time, etc. data.

Table 1

This embodiment is described below in conjunction with Table 1. For example, PE materials, when the extruder is working, the temperature in each temperature zone is different, but in this embodiment it is collectively referred to as the extrusion temperature setting value A1, and its drying temperature is 75 ℃, that is, the set value of the holding temperature is B1, and its heat resistance time is 1.5 hours. Temperature sensors are installed in each temperature range. When the extruder stops, the time relay starts timing. When the shutdown time reaches 1.5 hours, the time relay sends a signal to the temperature control unit, and the temperature control unit switches the extrusion temperature setting value A1 Set value B1 for the holding temperature. The temperature control unit controls the heating device to reduce the temperature in each temperature zone. When the temperature drops to 75°C, the temperature stops falling and remains at 75°C. Before starting the extruder, it is necessary to control the heating device by the temperature control unit to raise the temperature of each temperature zone to the extrusion temperature setting value A1, and then start the production. That is to say, after the extrusion material determination unit determines the type of material in the extruder, it sends a signal to the extrusion temperature determination unit. Set as extrusion temperature setting value A1. And the protection unit will protect the extruder by detecting the switching status and the temperature of each temperature zone. When the temperature control unit does not switch to the plasticizing temperature or the temperature of each temperature zone does not reach the plasticizing temperature, the protection unit prohibits the extruder from starting. However, in the prior art, since the heat preservation is not carried out after the shutdown, when the heating device is turned off, the temperature of each temperature zone is reduced from the extrusion temperature setting value A1 to the ambient temperature. When the extruder is turned on, it rises from the ambient temperature to the plasticizing temperature of the material in each temperature zone. In comparison, the thermal insulation system for the optical cable extruder of this embodiment can save a lot of energy consumption and improve production efficiency.

In addition, according to the content of Table 1, the shutdown time limit of PVC material can be set to 0.5 hours, the shutdown time limit of PP material can be set to 0.25 hours, and the shutdown time limit of flame retardant can be set to 0.5 hours. For different materials, set different shutdown time limits, and all kinds of extruded materials can save energy through the extruder insulation system.

In addition, when the temperature control unit switches the extruder from the heat preservation state to the heating state, the time relay is cleared to prepare for the next recording of the downtime.

In addition, the temperature control unit also has a temperature control switch, and the temperature control unit also has a temperature control switch for controlling the opening or closing of the heating device. The temperature control switch has a heating gear, a stop gear, and a mold changing gear. Or traction start to control the heating state of the extruder.

When the extruder is started in the heat preservation state, first switch the temperature control switch from the heating gear to the stop gear or the mold change gear, and then switch back to the heating gear, and the extruder can enter the heating state.

Alternatively, the extruder can also be activated by traction into a heated state.

In summary, the thermal insulation system of the optical cable extruder of the present invention has achieved the following technical effects:

1) With this heat preservation system, it can quickly heat up to the production temperature and improve production efficiency.

2) The thermal insulation system can prevent the screw from being damaged by heating for a long time and the penetration of the carbonized extruded material to the screw, thereby prolonging the service life of the screw.

3) Adopt this heat preservation system to avoid material carbonization and adsorption on the screw, so as to ensure the extrusion effect of the material.

4) Adopting the heat preservation system can effectively reduce the heating time by more than 50%, and can effectively reduce the power consumption.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. a kind of optical cable extruding machine heat-insulation system, including the time relay, temperature control unit, temperature sensing unit, wherein, temperature Degree control unit also includes extruded material determining unit and extrusion temperature determining unit, and the time relay, TEMP list Member is connected by circuit with temperature control unit respectively, and temperature sensing unit sends the temperature value measured in real time to temperature control Unit,

When extruding machine is shut down, time relay start recording shuts down duration, exceedes shutdown time limit, temperature control when shutting down duration Unit is switched to the desired temperature of each warm area of extruding machine by the extrusion temperature of extruded material the drying temperature of extruded material, After temperature is reduced to the drying temperature of extruded material, each warm area enters keeping warm mode；

When needing start, extruded material determining unit knows the extruded material species in extruding machine, and sends a signal to extrusion molding Temperature determining unit, extrusion temperature determining unit set the temperature of each warm area with reference to extrusion temperature parameter list according to material category Definite value is switched to the extrusion temperature of extruded material by the drying temperature of extruded material, when the temperature of each warm area reaches extruded material During extrusion temperature, extruding machine possesses compressor start up condition,

Wherein, the shutdown time limit is determined according to the heat-resisting fusion time of different extruded materials.

2. optical cable extruding machine heat-insulation system according to claim 1, it is characterised in that also including protection location, work as start When, if the desired temperature of each warm area is not switched to extrusion temperature setting value, protection location prompting temperature by temperature control unit Degree control unit switches over, and forbids extruding machine to start；

If the temperature of each warm area of extruding machine is not up to the extrusion temperature of extruded material, protection location also forbids extruding machine to start.

3. optical cable extruding machine heat-insulation system according to claim 1, it is characterised in that when temperature control unit is by extruding machine When switching to heated condition by keeping warm mode, the time relay is reset.

4. optical cable extruding machine heat-insulation system according to claim 1, it is characterised in that be limited to during the shutdown of PE materials 1.5 hour.

5. optical cable extruding machine heat-insulation system according to claim 1, it is characterised in that the shutdown time limit of PVC material For 0.5 hour.

6. optical cable extruding machine heat-insulation system according to claim 1, it is characterised in that be limited to during the shutdown of PP materials 0.25 hour.

7. optical cable extruding machine heat-insulation system according to claim 1, it is characterised in that the shutdown time limit of fire proofing For 0.5 hour.

8. optical cable extruding machine heat-insulation system according to claim 1, it is characterised in that temperature control unit, which also has, to be used for The temp control switch being turned on and off of heater is controlled, the temp control switch has heating gear, retaining catch, mold changing Gear, started by switching gear or traction, control the heated condition of extruding machine.

9. optical cable extruding machine heat-insulation system according to claim 8, it is characterised in that extruding machine starts under keeping warm mode When, temp control switch is first switched into retaining catch by heating gear or mold changing is kept off, then heating gear is switched back into, extruding machine enters heating State.

10. optical cable extruding machine heat-insulation system according to claim 8, it is characterised in that extruding machine by traction start into Enter heated condition.