CN207424647U - A kind of control circuit of micro- heat drying machine - Google Patents

Abstract

The utility model discloses a kind of control circuit of micro- heat drying machine, including：Heat control unit for controlling heater, start-up and shut-down control unit and PLC for controlling the Air Valve Control unit of air valve opening and closing, being started or stoped for control device, the heat control unit, Air Valve Control unit, the input terminal of start-up and shut-down control unit are connected respectively with PLC；The control circuit is further included for the electro connecting pressure gauge of control device pressure, the electro connecting pressure gauge is connected by the output terminal of relay and PLC, passes through the break-make of relay control PLC when equipment pressure change makes the pointer of electro connecting pressure gauge reach pressure threshold contact.Control circuit described in the utility model adds electro connecting pressure gauge and delay from unit is opened, realizes the Isobarically Control in certain pressure section, eliminate system decompression state, ensure the operation of air compression system safety and reliability, elimination workshop halt production phenomenon provides more a guarantees for the normal production in workshop.

Description

A kind of control circuit of micro- heat drying machine

Technical field

The utility model is related to drying machine technical field, more particularly, to a kind of control circuit of micro- heat drying machine.

Background technology

Existing air compression system compresses air to 8bar~8.8bar by screw-rod air compressor, is removed by cooling driers more Remaining moisture content and oil content lead to air accumulator, then are further filtered by micro- heat drying machine, and air is made to reach manufacturing technique requirent Cleanliness factor since micro- heat drying machine original machine designs upper existing defects, when air outlet valve is closed not in time or during failure, can cause Pressure influences workshop and normally produces.

Micro-heat regeneration absorbent compressed air drier is a kind of molecular force using porous solid material surface to inhale Take the cleaning equipment of the moisture content in gas.It uses aperture with activated alumina similar in hydrone diameter for adsorbent, and transports With alternating temperature principle of pressure swing adsorption；When adsorbing at normal temperatures, the partial pressure of moisture in air is more than point of hydrone in adsorbent Pressure, hydrone enter absorbent interior, adsorbent surface condensation into water droplet, and release condensation heat, by this heat store in The top of adsorption tower.During regeneration, the heated device of dry air is heated to 105 DEG C or so by regeneration barrel, while stores in adsorption tower Interior heat helps to save the power of heater.Adsorbent by absorption, regeneration, sorption cycle use, to compressed air into Row is continuously adsorbed by drying processing so as to obtain the gas of depth drying.Double tower alternating continuous work output dried and clean Compressed air.Its purify air moisture content up to -40 DEG C of dew point below, so as to obtain the high-purity of the anhydrous oil-free of depth drying Compressed air satisfaction gas needs.

Double tower air bleeding valve operational process causes whole air pressures to be let out from air bleeding valve there is being failure to actuate or not closing phenomenon Fall, so as to main pipeline compressed air be in pressure release state moment fall pressure, when compressed air less than 0.75mpa when workshop Kang Mei it is filling Machine falls pressure and stops production, and seriously affects Workshop Production.

Accordingly, it is desirable to provide a kind of control circuit of micro- heat drying machine.

Utility model content

The purpose of this utility model is to provide a kind of control circuits of micro- heat drying machine.

In order to achieve the above objectives, the utility model uses following technical proposals：

A kind of control circuit of micro- heat drying machine, including：For control heater heat control unit, for controlling The Air Valve Control unit of air valve opening and closing, the start-up and shut-down control unit and PLC started or stoped for control device, the computer heating control Unit, Air Valve Control unit, the input terminal of start-up and shut-down control unit are connected respectively with PLC；The control circuit further includes to control The electro connecting pressure gauge of control equipment pressure, the electro connecting pressure gauge is connected by the output terminal of relay and PLC, when equipment pressure Pass through the break-make of relay control PLC when power variation makes the pointer of electro connecting pressure gauge reach pressure threshold contact.

Further, relay includes intermediate relay and the time relay, input terminal and the electricity of the intermediate relay Contact pressure table connects, and the normally closed point of intermediate relay is connected the entire circuit of conducting, opened point and time relay with PLC output terminals Device connects, and opened point disconnects when equipment works, and the time relay does not work.

Further, the input terminal of the time relay is connected by the opened point of intermediate relay with electro connecting pressure gauge, Output terminal is connected with PLC, when equipment pressure be more than threshold value when intermediate relay normally closed point disconnect, opened point be closed, PLC stop Work, time relay work, be delayed turning circuit again.

Further, Air Valve Control unit is connected with PLC, including：First air inlet valve control unit, VCU, the control of the first air outlet valve Unit, the second air inlet valve control unit, VCU, the second outlet valve control unit, VCU, respectively the first drying chamber and the second drying in control device The air inlet of tank and outlet；

Air Valve Control unit further include for heater in control device into outlet heater air inlet valve control unit, VCU and Heater outlet valve control unit, VCU.

Further, electro connecting pressure gauge quantity is equal with drying chamber quantity and corresponds, one and only one electricity connects It works in point pressure table access circuit, remaining electro connecting pressure gauge does not work.

Further, start-up and shut-down control unit includes halt switch and starting switch, wherein when the starting switch is described Between relay timing closing switch, be connected with PLC, entire circuit turn-on during closure.

Further, time relay both ends are parallel with warning device, and time relay work Times alarm device also works.

Further, warning device includes buzzer and alarm lamp, and buzzer sounding, alarm lamp are bright during work.

Further, control circuit further includes to protect the pressure-head switch of circuit, is connected with PLC.

The beneficial effects of the utility model are as follows：

The control circuit of micro- heat drying machine described in the utility model, adds electric contact on the basis of available circuit Pressure gauge and delay realize the Isobarically Control in certain pressure section from unit is opened, and eliminate system decompression state, ensure pneumatics system Safety and reliability of uniting operation, meanwhile, micro- heat drying machine halt production phenomenon in workshop caused by the deficiency of design defect is eliminated, Delay provides mostly a ensure from the normal production opened as workshop.

Description of the drawings

Specific embodiment of the present utility model is described in further detail below in conjunction with the accompanying drawings；

Fig. 1 is micro- heat drying machine operation principle schematic diagram；

Schematic diagram before Fig. 2 improves for micro- heat drying machine control circuit；

Schematic diagram after Fig. 3 improves for micro- heat drying machine control circuit；

Fig. 4 is electro connecting pressure gauge schematic diagram.

Specific embodiment

In order to illustrate more clearly of the utility model, the utility model is done into one with reference to preferred embodiments and drawings The explanation of step.Similar component is indicated with identical reference numeral in attached drawing.It will be appreciated by those skilled in the art that below Specifically described content is illustrative and be not restrictive, and should not limit the scope of protection of the utility model with this.

A kind of control circuit of micro- heat drying machine disclosed in the utility model, as shown in Figure 1, low-grade fever formula in the prior art The operation principle of drying machine is：Humid air enters A drying chambers 2 from following pipeline 1 through A1 valves, bottom-up to flow through adsorbent 3, Adsorbent 3 is by after the water adsorption in air, and dry air is discharged from pipeline 9 above, and specific absorption principle is in background Technical agency continues, and no longer illustrates herein.Partially dried air enters B drying chambers by line check valve 8 above.It is dry after decompression Dry air (being known as regeneration gas) enters B drying chambers after heater 7 is heated to 105 DEG C, from up to down to the adsorbent in tank Parsing, the moisture in the adsorbent in B drying chambers is mixed into dry air at normal temperatures and pressures, and adsorbent recovers drying capacity, The dry air for being mixed into moisture is discharged by the B2 valves and muffler 6 of following pipeline in air.After to be adsorbed dose of regeneration ending, B2 valves are closed, and B drying chambers boost to operating pressure, prepare switching.Pipeline B1 valves are opened below, and A1 valves are closed, and A2 valves are opened, A, The dry tank bodies of B two complete switching, and B tanks enter absorption, A tank pressure release reproducing adsorbents.Job order and working time are by controlling Device 5 automatically controls completion.The compressed air of double tank alternating continuous work output dried and cleans.It purifies air moisture content up to dew Less than -40 DEG C of point so as to obtain the compressed air of the high-purity of the anhydrous oil-free of depth drying, meets the need that workshop normally produces It will.

A tanks drying operation B tanks are switched to regeneration, and B tanks drying operation A tanks are switched to regeneration, but two tank air bleeding valves were run Journey causes whole air pressures to be released from air bleeding valve there is being failure to actuate or not closing phenomenon, so as to which main pipeline compressed air is in Pressure release state moment fall pressure, when compressed air be less than 0.75mpa when workshop bottle placer fall pressure stop production, seriously affect workshop life Production must re-enter device parameter after falling pressure every time and check whether part of appliance stands intact, can just restart Equipment expends substantial amounts of manpower and cost before start to the maintenance and inspection of equipment.

It is illustrated in figure 25 internal circuit diagram of controller of micro- heat drying machine in the prior art, KM1 the and KM2 tables on the left side Show two heaters, control circuit includes heat control unit, respectively by two switch controls of K1 and K2；

With reference to Fig. 1, control circuit further includes Air Valve Control unit, wherein 1kc control A canister incoming gas valves A1,2kc control A tanks Air outlet valve A2,3kc control B canister incoming gas valves B1,4kc control B tank air outlet valves B2；

Control circuit further includes start-up and shut-down control unit, and wherein HL1 and HL2 are respectively equipment start indicator lamp and equipment downtime Indicator light, control switch 104 is halt switch, and 110 be starting switch, and 115 be pressure-head switch, the above-mentioned device in circuit Pin with PLC plates is connected, and PLC plates are equipped with device in relative program control circuit and work, and each device further controls Each equipment work.Cause to be failure to actuate or do not close due to various reasons in air bleeding valve operational process, foregoing circuit does not have Remedial measure.

The improved circuit diagram of the embodiment of the present application is illustrated in figure 3, on the circuit between controller 5 and each equipment Electro connecting pressure gauge is added in, A represents to control the electro connecting pressure gauge of A drying chambers in wherein Fig. 3, and B represents the electricity of control B drying chambers Contact pressure table, one is high pressure when being worked due to two drying chambers, and one is normal pressure, therefore only corresponding pressure pan in circuit Electro connecting pressure gauge and circuit communication.KA represents intermediate relay, is connected with electric contact pressure Table A or B, the normally closed point of top KA is connected the entire circuit of conducting with PLC output terminals, and the opened point KA of lower section is connected with time relay KT, when equipment works normally Opened point disconnects, and the time relay does not work.The input terminal of time relay KT is connect by the opened point of intermediate relay with electricity Point pressure table connects, and output terminal is connected with PLC, when equipment pressure (is held more than the pressure threshold set in advance more than maximum Be stressed or less than minimum pressure setting value) when intermediate relay KT normally closed point KA disconnect, opened point KA is closed, and PLC stops Work, time relay work, be delayed turning circuit again.It is improved to coordinate with time relay KT at starting switch 110 Timing closing switch, represented in figure with crescent.

Electro connecting pressure gauge schematic diagram is illustrated in figure 4, when equipment works normally, accesses the electric contact pressure in circuit The pointer of table shows pressure value, opened point and the electric contact pressure of intermediate relay KA in the pressure bound threshold range of setting Two threshold value contact points connection of power table causes pressure inside the tank to be reduced to setting value 0.78mpa, refers to when a certain air valve breaks down Pin is connected with lower limit contact point, and the normally closed point of intermediate relay KA disconnects, and PLC cuts off the power, and pneumatic operated valve is automatically closed program, The pressure release state of elimination system, so as to ensure that air compression system is more safe and reliable, whole equipment is holding state at this time.By It is connected in pointer with lower limit contact point, so as to be connected with the opened point of intermediate relay, time relay KT work, according to setting Time delays after control timing closing switch restarting equipment.

Time relay KT both ends are parallel with warning device, and time relay KT work Times alarm devices also work, are being worth Class's room installation alarm lamp and buzzer, when equipment is fallen and presses pressure release, buzzer sounding, alarm lamp are bright to remind work people Member reaches scene and finds and handle as early as possible.

To sum up, the control circuit of micro- heat drying machine described in the utility model, adds on the basis of available circuit Electro connecting pressure gauge and delay realize the Isobarically Control in certain pressure section from unit is opened, and eliminate system decompression state, ensure Air compression system safety and reliability is run, meanwhile, it eliminates micro- heat drying machine and stops in workshop caused by the deficiency of design defect Phenomenon is produced, delay is opened certainly provides more a guarantees for the normal production in workshop.

Obviously, above-described embodiment of the utility model is only intended to clearly illustrate the utility model example, and It is not the restriction to the embodiment of the utility model, for those of ordinary skill in the art, in above description On the basis of can also make other variations or changes in different ways, all embodiments can not be exhaustive here, It is every to belong to obvious changes or variations that the technical solution of the utility model is extended out still in the utility model The row of protection domain.

Claims (9)

1. a kind of control circuit of micro- heat drying machine, which is characterized in that including：For controlling the computer heating control list of heater Member, start-up and shut-down control unit and PLC for controlling the Air Valve Control unit of air valve opening and closing, being started or stoped for control device, The heat control unit, Air Valve Control unit, the input terminal of start-up and shut-down control unit are connected respectively with PLC；The control circuit It further includes for the electro connecting pressure gauge of control device pressure, the electro connecting pressure gauge passes through relay and the output terminal of PLC Connection, when equipment pressure change makes the pointer of electro connecting pressure gauge reach pressure threshold contact by relay control PLC Break-make.

2. control circuit according to claim 1, which is characterized in that the relay include intermediate relay and time after Electric appliance, the input terminal of the intermediate relay are connected with electro connecting pressure gauge, and normally closed point and the PLC output terminals of intermediate relay connect The entire circuit of conducting is connect, opened point is connected with the time relay, and opened point disconnects when equipment works, and the time relay does not work.

3. control circuit according to claim 2, which is characterized in that the input terminal of the time relay by centre after The opened point of electric appliance is connected with electro connecting pressure gauge, and output terminal is connected with PLC, when equipment pressure be more than threshold value when intermediate relay Normally closed point disconnect, opened point is closed, and PLC is stopped, time relay work, delay turning circuit again.

4. control circuit according to claim 1, which is characterized in that the Air Valve Control unit is connected with PLC, including： First air inlet valve control unit, VCU, the first outlet valve control unit, VCU, the second air inlet valve control unit, VCU, the second outlet valve control unit, VCU, The air inlet of first drying chamber and the second drying chamber and outlet in control device respectively；

The Air Valve Control unit further include for heater in control device into outlet heater air inlet valve control unit, VCU and Heater outlet valve control unit, VCU.

5. control circuit according to claim 4, which is characterized in that the electro connecting pressure gauge quantity and drying chamber quantity Equal and one-to-one corresponding, one and only one electro connecting pressure gauge are accessed in circuit and worked, remaining electro connecting pressure gauge does not work.

6. control circuit according to claim 3, which is characterized in that the start-up and shut-down control unit includes halt switch and opens Dynamic switch wherein the starting switch switchs for the timing closing of the time relay, is connected with PLC, and when closure is entirely electric Road turns on.

7. control circuit according to claim 3, which is characterized in that the time relay both ends are parallel with alarm dress It puts, time relay work Times alarm device also works.

8. control circuit according to claim 7, which is characterized in that the warning device includes buzzer and alarm lamp, Buzzer sounding, alarm lamp are bright during work.

9. control circuit according to claim 1, which is characterized in that the control circuit further includes to protect circuit Pressure-head switch is connected with PLC.