CN201532083U

CN201532083U - drying machine

Info

Publication number: CN201532083U
Application number: CN2009202588101U
Authority: CN
Inventors: 黄晓许
Original assignee: Wuxi Suntech Power Co Ltd
Current assignee: Wuxi Suntech Power Co Ltd
Priority date: 2009-11-12
Filing date: 2009-11-12
Publication date: 2010-07-21
Anticipated expiration: 2019-11-12

Abstract

The utility model relates to a drying machine which comprises an oil bath furnace, a heating pipe and a temperature control system, wherein the heating pipe is used to heat heat conduction media in the oil bath furnace, and the temperature control system is used to prevent the heat conduction media from exceeding a setting temperature to break a heating loop of the heating pipe. The drying machine further comprises an overtemperature protection system which plays the role of backup protection when the temperature control system breaks down. Even through when the temperature control system breaks down to cause the heating loop not to break, which leads the heating pipe to always locate in a heating state and cause overheating, the overtemperature protection system which is used as the backup protection still can effectively cut the heating loop, and furthermore, unexpected situations are prevented from generating.

Description

A kind of drier

Technical field

The utility model relates to a kind of drier, relates in particular to a kind of overtemperature prote system that is applied to the drier of photovoltaic cell manufacturing field.

Background technology

In the photovoltaic cell manufacture process, after the making herbs into wool operation is finished, by drier to silicon chip clean, centrifuge dripping hyperthermia drying again.Because drier needs at work heat-conducting medium ethylene glycol heating in the oil bath furnace, and on the existing drier sleeving temperature control system only is housed, if breaking down, this sleeving temperature control system can cause the temperature in the oil bath furnace to rise always, accident takes place if internal temperature rising always can cause oil bath furnace spray ethylene glycol, the boiling point of ethylene glycol is 194～197 ℃, will cause fatal scald accident if so high temperature is sprayed onto on personnel's the health.

Fig. 1 is the temperature logic control relation figure of existing drier, because the design defect of traditional drier has only a sleeving temperature control system, does not have the overtemperature prote control system, from the logic control relation of Fig. 1 as can be seen:

If it is inaccurate that 1 PT100 temperature sensor occurs measuring temperature, promptly actual temperature is very high in the oil bath furnace, and the temperature that the PT100 temperature sensor measurement obtains is lower, will cause heating tube to be in heated condition always.

If 2 PLC programmable control modules (comprising the A/D analog-to-digital conversion module) break down, will cause heating output signal mistake, and then cause heating tube to be in heated condition.

If the contact of 3 relays can not be opened, will cause contactor charged always, and then make heating tube be in heated condition always.

Can not open if the main contact of 4 contactors hinders for some reason, will cause heating tube to be in heated condition always.

From top analysis as can be seen: will cause the lasting rising of heat-conducting medium ethylene glycol temperature in the oil bath furnace if the heating tube of existing drier is in heated condition always, the ethylene glycol temperature is not controlled in the oil bath furnace, can have bigger potential safety hazard.

Summary of the invention

The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of drier is provided, when existing temperature control system broke down the generation overtemperature, its overtemperture control system still can effectively cut off heating circuit, and then prevented that fortuitous event from taking place.

Provide a kind of drier according to the technical solution of the utility model; comprise oil bath furnace, be used to heat the heating tube of heat-conducting medium in the oil bath furnace and be used to prevent heat-conducting medium from surpassing design temperature and disconnect the temperature control system of heating tube heating circuit that it also comprises the overtemperature prote system that plays the back-up protection effect when temperature control system breaks down.

Described temperature control system comprises first temperature sensor, touch-screen, PLC universal logic module, first relay, first contactor and the heating tube heating circuit that is connected, the heat-conducting medium temperature signal that described first temperature sensor is gathered and the signal of touch-screen are as the input signal of PLC universal logic module, when the temperature of heat-conducting medium exceeds the setting value of PLC universal logic module, the output signal of described PLC universal logic module makes first relay and the action of first contactor, thereby disconnects heating circuit.

Described overtemperature prote system comprises second temperature sensor, temperature controller, second contactor and second relay that links to each other with the heating tube heating circuit; the heat-conducting medium temperature signal that described second temperature sensor is gathered is as the input signal of temperature controller; when the temperature of heat-conducting medium exceeds the setting value of temperature controller; the output signal of described temperature controller makes second relay and the action of second contactor, thereby disconnects heating circuit.

Described overtemperature prote system also comprises the buzzer that is connected with described relay, and when the temperature of heat-conducting medium exceeded setting value, described buzzer sent alarm signal.

The beneficial effects of the utility model are; when the utility model in when work; even when the temperature control system of drier breaks down; it is inaccurate to occur measuring temperature as first temperature sensor; or PLC comprises that the A/D module breaks down and causes heating output signal mistake; perhaps can not open and cause heating circuit to disconnect owing to the contact of first relay and first contactor; when making heating tube be in heated condition to cause overtemperature always; Bao Hu overtemperature prote system still can effectively cut off heating circuit in support, and then prevents that fortuitous event from taking place.

Description of drawings

Fig. 1 is existing drier temperature logic control relation block diagram;

Fig. 2 is a drier temperature logic control relation block diagram of the present utility model.

Fig. 3 is for having increased the schematic diagram of buzzer among Fig. 2.

The specific embodiment

The utility model is described in further detail below in conjunction with concrete drawings and Examples.

As shown in Figure 2: silicon wafer drying machine of the present utility model; comprise oil bath furnace (not shown), be used to heat the heating tube 6 of heat-conducting medium in the oil bath furnace and be used to prevent heat-conducting medium from surpassing design temperature and disconnect the temperature control system of heating tube heating circuit that it also comprises the overtemperature prote system that plays the back-up protection effect when temperature control system breaks down.

Described temperature control system comprises first temperature sensor 1, PLC universal logic module 3, first relay 4, first contactor 5 of connecting with the heating tube heating circuit, and the touch-screen 2 that links to each other with PLC universal logic module 3.

First relay 4 and first contactor 5 are in series with the heating circuit of heating tube 6, the first input end of the output of first temperature sensor 1 and PLC universal logic module 3 joins, second input of the output of touch-screen 2 and PLC universal logic module 3 joins, the heat-conducting medium temperature signal that first temperature sensor 1 is gathered be the temperature output signal of screen display of touch-screen 2 as the input signal of PLC universal logic module 3, by universal logic module 3 its input signal is carried out logical process.When the critical-temperature that exceeds the setting of PLC universal logic module when the temperature of heat-conducting medium was spent as 130, described PLC universal logic module output signal made

first relay

4 and 5 actions of first contactor, thereby disconnects heating circuit.In the above-described embodiment, wherein first temperature sensor is preferably the PT100 platinum resistance thermometer sensor.

Described overtemperature prote system comprises second temperature sensor 7, temperature controller 8, second contactor 12, second relay 9.Wherein second contactor 12 and second relay 9 also are in series with the heating circuit of heater 6, and second temperature sensor 7 is used to gather the temperature signal of heat-conducting medium.The output of second temperature sensor 7 connects the input of temperature controller 8, with the temperature signal that the collects input signal as temperature controller 8.When the critical-temperature that exceeds the setting of temperature controller when the temperature of heat-conducting medium was spent as 135, the output signal of described temperature controller made second relay 9 and 12 actions of second contactor, thereby disconnects the heating circuit of heating tube.In above-mentioned overtemperature prote system, wherein second temperature sensor 7 is preferably the PT100 platinum resistance thermometer sensor.

As shown in Figure 3, preferred, described overtemperature prote system also comprises the buzzer 10 that is connected with described relay, and when the temperature of heat-conducting medium exceeded setting value, described buzzer 10 sent alarm signal.

Concrete protection philosophy is:

When the original temperature control system of drier breaks down can't disconnect heating circuit the time; second sensor 7 is passed to temperature controller 8 to the temperature signal that collects; the overtemperature prote temperature that temperature controller 8 is provided with above is higher 5～10 ℃ than the critical-temperature that temperature control system is set; when the temperature in the oil bath furnace surpasses the overtemperature prote temperature; temperature controller 8 outputs signal to second relay 9; its normally-closed contact of the charged back of second relay coil is opened; and then make second contactor, 12 coil losing electricities; second contactor, 12 main contacts disconnect, and heating tube quits work.Other second relay, 9 its normally opened contact closures of charged back, the buzzer 10 charged acoustic alarm signal prompting oil bath furnace generation overheating problems that send.

The utility model is under the situation that does not influence ordinary production; on original temperature control system basis, increased by one and overlapped independently overtemperature prote system; even breaking down, original temperature control system cause heat medium such as ethylene glycol in the oil bath furnace to continue heating; as long as ethylene glycol surpasses the overtemperature prote temperature of setting in the drier oil bath furnace; overtemperature prote just action disconnects heating system; so just can avoid heat medium to be heated to boiling point always; cause the oil bath furnace internal pressure to increase and generation oil spout even explosion accident, the security that can greatly improve drier temperature control aspect; stability.

After installing the overtemperature system in addition additional, when patrolling and examining, operating personnel also can in time find fault by contrast.For example; if the temperature controller temperature displayed of the touch-screen of temperature control system and overtemperature prote system differs bigger; can judge whether local generation charing causes thermometric inaccurate in the oil bath furnace; whether there is temperature sensor to break down; to comprise that the PLC analog-to-digital conversion module occurs unusual for temperature controller and PLC, and then can accomplish the discovery early of problem.

Above embodiment is an exemplary embodiment of the present utility model only, is not used in restriction the utility model, and protection domain of the present utility model is defined by the claims.Those skilled in the art can make various modifications or be equal to replacement the utility model in essence of the present utility model and protection domain, this modification or be equal to replacement and also should be considered as dropping in the protection domain of the present utility model.

Claims

1. drier; comprise oil bath furnace; be used to heat the heating tube of heat-conducting medium in the oil bath furnace and be used to prevent heat-conducting medium from surpassing design temperature and disconnect the temperature control system of the heating circuit of described heating tube; described temperature control system comprises first temperature sensor; touch-screen; the PLC universal logic module; first relay and first contactor; the first input end of the output of first temperature sensor and PLC universal logic module joins; second input of the output of touch-screen and PLC universal logic module joins; the input of the output of PLC universal logic module and first relay joins; the input of the output of relay and first contactor joins; first contactor and heating tube join; it is characterized in that: it also comprises the overtemperature prote system that plays the back-up protection effect when temperature control system breaks down, and described overtemperature prote system connects with the heating circuit of described heating tube.

2. a kind of drier according to claim 1; it is characterized in that: described overtemperature prote system comprises second contactor; second relay; second temperature sensor and temperature controller; the output of the first input end of second contactor and first contactor joins; the output of second contactor links to each other with the heating circuit of heating tube; second temperature sensor and heating tube heating circuit link to each other and its output is connected the input of temperature controller; the output of temperature controller connects the input of second relay; the output of second relay connects second input of second contactor, and the heat-conducting medium temperature signal that described second temperature sensor is gathered is as the input signal of temperature controller.

3. a kind of drier according to claim 2 is characterized in that: described overtemperature prote system also comprises the buzzer that is connected with described second relay output end.