CN2119962U - Automatic control instrument by transistor - Google Patents

Automatic control instrument by transistor Download PDF

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Publication number
CN2119962U
CN2119962U CN 91222742 CN91222742U CN2119962U CN 2119962 U CN2119962 U CN 2119962U CN 91222742 CN91222742 CN 91222742 CN 91222742 U CN91222742 U CN 91222742U CN 2119962 U CN2119962 U CN 2119962U
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circuit
controller
panel
delay circuit
common point
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CN 91222742
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孙忠祥
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Individual
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Abstract

The utility model discloses an automatic control instrument of the transistor of the raymond machine used for the pulverization in the stone powder factory, the cement mill factory, the magnesia mine, etc., which comprises an outer shell, a control board, a panel and a connector socket. The control board is fixed on the back surface of the panel by a support bracket through a screw. The panel is fixedly connected with a rectangular-shaped outer shell body by a four-angle screw. The round connector socket is inlaid on the lower end of the panel. Each circuit of the control board is correspondingly connected with each joint on the socket by conducting wires. When the starting current of the motor is in peak value, the peak value can be delayed by a time delay relay. The service life of the instrument is prolonged. The automatic material feeding is realized by a rotation controller and the photoelectric control. The sensitivity is 100%.

Description

Automatic control instrument by transistor
A kind of stone flour factory that is applicable to, the cement plant, the magnesia ore deposit, petroleum recovering equipment, large and medium motor equipment etc. are pulverized the Raymond machine transistor auto-controller of usefulness.
At present; in service in pulverizing; substantial equipment accident and electrical hazard often take place in Raymond machine; reason is when feeding intake because carelessness; have in the material φ 20mm iron or because of the Raymond machine shaking force big; machine itself falls due to the iron, does not have high sensitivity can solve the device of automatic protection of Raymond machine and autofeed at present.With regard to the Raymond machine that Haicheng City stone flour factory pulverization stone flour is used; the protective device that its main frame adopts now has fuse, thermal element and air switch, its moment overcurrent do not have protective effect; the selection coefficient height of electric current is for the motor rated current just can play a protective role more than 2 times.But when Raymond machine main frame fault current reached more than two times, the damaged condition of Raymond machine own was big; repair at every turn or change a Raymond machine, economic loss can reach thousands of units to units up to ten thousand, existing protective device accident rate height; equipment is fragile, and inapplicable Raymond machine operate as normal needs.
The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of Raymond machine transistor auto-controller is provided, it is to cross current circuit, delay circuit, autofeed circuit etc. are combined integrated, solve the Raymond machine main frame and cause overcurrent because of advancing irony or other factors, a damage equipment and a difficult problem that electrical hazard occurs, and utilize and regulate the fan electromotor current value, control flow is rotated in control, reaches the purpose of autofeed.
The concrete structure of the utility model is provided by following embodiment and accompanying drawing thereof;
The overall external form figure of Fig. 1 the utility model
Fig. 2 the utility model connector socket position connection layout.
Fig. 3 the utility model rear board wiring diagram.
Fig. 4 the utility model control panel wiring diagram.
Fig. 5 the utility model electrical schematic diagram.
Fig. 6 electromagnetism pivoting controller wiring diagram.
Below in conjunction with accompanying drawing in detail concrete structure of the present utility model and operational detail are described in detail.
See shown in the accompanying drawing 1-3.
Raymond machine transistor auto-controller is made of shell body (17), control panel (18), panel (16), connector socket (15), control panel (18) is fixed on the back of panel (16) by screw with support, panel (16) is fixedlyed connected with rectangle shell body (17) by square head bolts, and garden shape connector socket (15) is embedded in panel (16) lower end.
Has power switch K before and after the panel (16) 1(1), raw material selector switch K 3(2) check and correction K switch 2(3), hand auto selector switch K 4(4), automatic overcurrent indicator lamp DZ 4(5), autofeed indicator lamp DZ 3(6), the automatic guard lamp DZ of time-delay 2(7), power supply indicator DZ 1(8), Raymond machine main frame constant current potentiometer W fuse DR(10 DC ammeter A(9)), 1(11), feed potentiometer W 1(12), time-delay potentiometer W 2(13), blower fan constant current potentiometer W 3(14), connector socket (15) constitutes, front and back panel (16) parts are corresponding one by one, all connect by lead.
Connector socket (15) is by five windings point: A 1A 2(1-3), D 1D 2(8-4), G 1G 2(17-19), C 1C 2(7-16), A 2H(3-12) constitute.
A 1A 2Join 220 volts of voltages, D with power supply in the host computer control case 1D 2With current transformer PT in the Raymond machine host computer control case 1The secondary coil series connection, G 1G 2Connect C with A.C. contactor CJ solenoid in the host computer control case 1C 2With the dynamo-electric current transformer PT of host computer control case apoplexy 2The secondary coil series connection, A 2H is in parallel with electromagnetic feeder coil L in the host computer control case.
9 jiaos of plugs (19) among Fig. 3, Fig. 4 and 9 corner sockets (23), 15 jiaos of plugs (20) and 15 corner sockets (25), 4 jiaos of plugs (21) and 4 corner sockets (24), 4 jiaos of plugs (22) and all corresponding grafting of 4 corner sockets (26).
On rectangle control panel (18), have current foldback circuit, delay circuit, autofeed circuit, manual feed circuit formation, all by corresponding being connected of each contact of lead and socket.
Introducing each parts of Raymond machine transistor auto-controller below in detail connects and operation principle:
Transistor auto-controller and existing Raymond machine main frame, blower fan, current transformer, hand feeder collection are one, with reference to figure, 1-5 wiring, connect power supply, can carry out work.
On rectangle control panel (18), have current foldback circuit, delay circuit, autofeed circuit and manual feed circuit-line and connect, see shown in Figure 5.
1, current foldback circuit line connecting relation and principle:
Current foldback circuit is by signal transformer B 1, constant current potentiometer W 1, diode D 1, current-limiting resistance R 12, electrolytic capacitor filter C 1, adjustable resistance R 1, R 2, dc amplifier BG 1, BG 2, overcurrent relay J 1, diode D 2Etc. formation.
Current transformer PT 1Primary winding is connected current transformer PT with Raymond machine main frame motor D 1Secondary coil and ammeter (A), signal transformer B 1The primary winding series connection, signal transformer secondary coil and constant current potentiometer W 1Parallel connection, current foldback circuit W 1, C 1, J 1-2, R 1, R 2, BG 2Emitter stage one end is connected diode D with delay circuit negative pole (common point Y) respectively 1Positive pole respectively with signal transformer B 1One end is connected in series, effect halfwave rectifier, electrolytic capacitor filter C 1Positive pole is connected on commutation diode D respectively 1Output and the cloudy R of current limliting electricity 12An end; R 12, R 1, R 2One end respectively with selector switch K 3Both sides are connected; BG 1Base stage and K 3Central point is connected, thereby selects the operating current size.BG 1Emitter stage and BG 2Base stage is connected, BG 1, BG 2Colelctor electrode and D 2Positive pole respectively with overcurrent relay coil J 1One end is connected, D 2Negative pole and overcurrent relay J 1Coil one end respectively with the time-delay relay SJ of delay circuit 2Normal opened contact SJ 2-3One end A ' is connected SJ 2-3" (common point B's other end A) is connected with the delay circuit positive pole, and A ' other end passes through Dz 2Indicator lamp and BG 2Emitter stage is connected; Overcurrent relay J 1Normally closed contact J 1-1Connect the check and correction K switch with the A.C. contactor CJ solenoid in the Raymond machine control cabinet 2With overcurrent relay normally closed contact J 1-1Parallel connection, normal opened contact J 1-2One end and indicator lamp DZ 4Be connected DZ 4The other end and E 2Be connected, by K 2Open and close (DZ 4Bright, dark) adjustment main frame continuous current.
The overcurrent relay operation principle
When starting the Raymond machine motor, signal transformer B 1Primary winding has electricity, and its secondary coil has the secondary AC signal, passes through W 1Constant current is adjusted, and changes AC signal output, through D 1Halfwave rectifier, C 1Be filtered into sawtooth signal, by R 12For BG 1Base signal, adjustable resistance R 1, R 2Select to adjust running current value, K switch 3Raymond machine is processed raw material (soft, hardness), select the operating current size.Direct current signal is by R during normal the operation 1Or R 2With K 3Constitute the loop, make BG 1, BG 2Be in cut-off state; If Raymond machine main frame motor surpasses Constant Electric Current flow valuve, BG 1, BG 2Conducting, the overcurrent device J that continues 1Adhesive makes J 1-1The contact cuts off the gauge tap of Raymond machine main frame motor by normally closed change normally open, and A.C. contactor solenoid electricity discharges, the operation of Raymond machine stop.
2, delay circuit line connecting relation and principle:
Delay circuit is by raise formula rectification circuit D 3-6, π type electrolytic capacitor filter circuit C 2, R 3, C 3, voltage-stabiliser tube DW 1, DW 2, thermo-compensator R 4, R 5, R 6, the delay protection resistance R 7, electrochemical capacitor C 4, discharge resistance R 8, time-delay relay J 2, unijunction transistor BG 3Constitute.
Power switch K 1, fuse DR all with power transformer B 2The primary winding series connection at power supply A 1A 2Two ends, supply voltage V 1Be 220 volts, power transformer B 2The secondary coil output voltage V 2Be 20 volts, V 3Be 6.3 volts and indicator lamp DZ 1Parallel connection is because this circuit adopts special connected mode: V 2=end and bridge rectifier D 3-6Connect electrochemical capacitor C 2, C 3, resistance R 3Form π type filter circuit, time-delay relay container SJ 2Normal opened contact SJ 2-3Control overcurrent relay J 1Dc source 2. will start big electric current time-delay 30-60 after second, time-delay relay SJ 2Reach setting valve, J 1Automatically drop into protection.
C 2Anodal, R 3One end is connected with raise formula rectification circuit output end (positive pole) respectively; R 3The other end, C 3Anodal, DW 1Negative pole, R 4, R 7One end is connected with delay circuit positive pole (common point B) respectively.Voltage-stabiliser tube DW 1, DW 2Be connected in parallel on delay circuit both positive and negative polarity two ends (B, Y) after the series connection, R 4, R 5, R 6One end is common point X, R 6The other end and unijunction transistor BG 3The first base stage b 1Connect unijunction transistor BG 3, the second base stage b 2One end and time-delay relay SJ 2Coil one end and SJ 2-1Normal opened contact one end is connected R 7The other end and time-delay potentiometer W 2One end is connected, W 2The other end respectively with C 4Anodal, resistance R 8One end, unijunction transistor BG 3Emitter stage is connected, R 8The other end and SJ 2-2One end connects; DZ 1, D 5, D 6, C 2Negative pole, C 3, DW 2Anodal, R 5, SJ 2, C 4Negative pole, SJ 2-2The other end is connected with the negative pole of delay circuit (common point Y) respectively, SJ 2-1One end respectively with delay circuit positive pole, R 3, C 3One end (common point B) is connected, its other end respectively with unijunction transistor BG 3Second base stage, SJ 2One end is connected, and carries out the delay circuit self-locking.
The time-delay relay operation principle:
Connect power switch K 1, B 2Voltage is arranged: V 1Be 220 volts, V 2Be 20 volts, behind bridge rectifier, π type filter circuit and voltage-stabiliser tube, voltage stabilizing output for delaying time accurately, is adopted R 4, R 5, R 6Make temperature-compensation circuit, work as C 4During the two ends zero potentials, BG 3End J 1Be in normally off, adjust W 2R is passed through in the time-delay of adjusting 7To C 4Charging is 30-60 second when the main engine starting time, and when reaching the electric current peak value, time-delay relay is delayed time peak value in the past, when main frame motor running current is steady, and C 4To BG 3Discharge, time-delay relay adhesive, SJ 2-3Closure is to the overcurrent device J that continues 1For dc source, overcurrent relay J 1Play protection, wait marquis's overcurrent, SJ 2-1Contact carries out the delay circuit self-locking, in order to make SJ 2Accurately time-delay for the second time must be got rid of electrochemical capacitor C 4Surplus is utilized SJ 2-2With R 3Series connection back and C 4Parallel connection, SJ 2During adhesive remaining electric weight is passed through R 8Constitute the loop, surplus electric weight has been put.
3, autofeed circuit and manually feed circuit connecting relation and principle
The autofeed circuit is by electromagnetism pivoting controller (28), photoconductive tube DU, illuminator DX, current-limiting resistance R 9, adjustable resistance R 10, triode BG 4, BG 5, relay J 2, diode D 7, constant current potentiometer W 3Constitute.
Manually the feed circuit is by transformer B 3, piezo-resistance μ, controllable silicon SCR, resistance R 12-15, capacitor C 5-8, diode D 8-9, adjustable potentiometer W 4, ammeter A, L(is known for the batcher coil) constitute.
The rotation control flow (30) of the electromagnetism pivoting controller (28) of autofeed circuit places between illuminator DK and the photoconductive tube DU, and on a transversal line, sees shown in Fig. 5-6.
Illuminator DX and power supply indication DZ 1Parallel connection, its voltage V 3=6.3 volts,
Electromagnetism pivoting controller (28) is by current transformer (27), support (29), rotate control flow (30), rotating coil (31), garden cylindrical magnetic iron (32), coil-end axle (33), the damping (34) of oil silk, felt pad (35) constitutes, garden cylindrical magnetic iron (32) places rotating coil (31), rotating coil (31) is bonded on the Contraband type support (29) by coil-end axle (33) and felt pad (35), rotate control flow (30) and be welded on coil-end axle (33) upper end by copper cash, oil silk damping (34) one ends are welded on coil-end axle (33) lower end, the other end is fixed on support (29) side with screw, and Contraband type support (29) is fixed on the control panel (18) with screw.
Current transformer (27) has two groups of coils, primary line astragal footpath φ 1.35mm, 8 circles, secondary line astragal footpath φ 0.18mm, 40 circles, primary winding C 1C 2With ammeter and blower fan current transformer PT 2Secondary coil connects, its secondary coil N 1N 2Two ends are in parallel up and down with the coil-end axle (33) of rotating coil (31) respectively for two ends, and W 3Parallel connection, W 3Potentiometer is adjusted the blower fan constant current, control feed, blower fan current transformer PT 2Primary winding is connected with fan electromotor.
Delay circuit positive pole (common point B) passes through C 3One end respectively with the BG of autofeed circuit 4Colelctor electrode, R 9, D 7, SJ 2-1, J 2, J 2-1One end (common point Z) is connected, the negative pole of delay circuit (common point Y) respectively with the BG of autofeed circuit 5Emitter stage, R 11, R 10One end is connected; J 2-1The other end and DZ 3One end is connected, DZ 3The other end and SJ 2-2One end (common point Y) is connected normal opened contact SJ 2-2With K 4Parallel connection, K 4Two ends are connected in series with manual feed circuit power respectively.
R 9One end is connected with photoconductive tube DU positive pole, the photoconductive tube DU other end respectively with R 10One end, BG 4Base stage is connected, BG 4Emitter stage and BG 5Equal and the R of base stage 11The other end is connected, BG 5Colelctor electrode respectively with D 7, J 2One end is connected.
The autofeed operation principle:
By the blower fan size of current, rotate control flow (30) swing, control photoconductive tube DU controls when unglazed (illuminator DZ 1Be rotated control flow (30) shield), DU, BG 4, BG 5Circuit is a cut-off state, and (because of photoconductive tube DU internal resistance up to hundreds of kilo-ohm), J 2Do not work the stop feed; When control has the light time, DU conducting, BG 4, BG 5Conducting, dc amplifier work, relay J 2The adhesive feed is adjusted adjustable resistance R 10Can change autofeed sensitivity height, realize autofeed, control fan operation current range 0-40A.
If the autofeed circuit is malfunctioning, selector switch K 4Close, just can the manual operation feed, A 1A 2With A 1A 2Same supply voltage.
Using method:
When auto-controller installs, turn on the power switch K 1(1), power supply indicator DZ 1(8) bright, according to the selector switch K that processes raw material 3(2), main frame constant current potentiometer W 11Reflect current digital, promptly react PT 1A running current is transferred W 1, high-ranking officers are to K switch 2(3) close the accent constant current, indicator lamp DZ 4(5) show J 1Adhesive, indicator lamp DZ 4(5) bright, adjust time-delay potentiometer W 2(13), protect indicator lamp DZ automatically 2(7) bright, the indication overcurrent protection, if before main frame do not start, selector switch K 4The position, manual feed, when blower fan starts operation, selector switch K 4(4) position autofeed, during blower fan Current Control autofeed, autofeed indicator lamp DZ 3(6) bright, adjustment potentiometer W working properly 3(14) constant blower fan size of current, the control autofeed, feed degree size is adjusted knob W 4(12), with reference to ammeter A(9), show the feed situation.
If the autofeed circuit breaks down, selector switch K closes 4, adjust potentiometer W 4(12), with reference to ammeter A with regard to practicable manual feed; If main frame breaks down, can be by the check and correction K switch 2(3) if check is K 2(3) close, host work is normal, and then fault appears on the controller circuit; If cisco unity malfunction illustrates that the host computer control case has problem, can look into respectively and draw reason.
Advantage and effect thereof
1, the utility model is owing to adopt time-delay relay SJ and overcurrent relay J 1Electric motor starting electric current peak value is by time-delay relay SJ 2With the time-delay of starting current peak value in the past, when Raymond machine main frame motor operating current reaches steady, time-delay relay SJ 2Reach the setting time value, SJ 2Close SJ 2-3Contact is supplied with overcurrent relay J 1Dc source, overcurrent relay shields.
2, the utility model is in the delay protection circuit, and Raymond machine main frame overcurrent protection value selects to be greater than the 50-60% of operating current, if because of equipment (falling iron or electric overcurrent) in service greater than operating current 50-60%, overcurrent relay J 1Action immediately, overcurrent relay J 1Normally closed contact cuts off the power supply immediately, and the operation of main frame stop reaches the protection purpose.
3, the utility model so sensitivity up to more than 98%, prolongs the service life of Raymond machine, improves utilization rate of equipment and installations because design overcurrent protection electric current is low, improves the quality of products and product quantity.
4, the utility model adopts photo-electric control owing to utilize the blower fan electric current to change, and realizes autofeed, and feed is even, can improve output more than 10%, and its sensitivity of autofeed reaches 100%.
5, the utility model is practical, does not need to change original equipment, just can work as long as load onto this controller, and simple in structure, easy to operate, volume is little, and is in light weight, and cost is low, and applicability is strong.
Example 1
Electromagnetism pivoting controller (28) selects for use 69L11 type 5A alternating current gauge outfit to replace 69L11 type 5A alternating current ammeter head current coil C 1C 2With blower fan current transformer PT 2The secondary coil series connection, gauge outfit rotating coil N 1N 2Connect by both sides end axle, be fixed on the insulating support rotating coil N 1N 2With potentiometer W 3Control end screen G(30 is rotated in parallel connection) be bonded on the gauge outfit pin control flow G(30) make with black Polypropylence Sheet, and will rotate control flow G(30) place between power lights and the photoconductive tube, and on a transversal line, control when unglazed the stop feed; Control has light time, autofeed.
Embodiment 2
Resistance: R 1, R 2, be 0.5w, 47K Ω,
R 3＝5.1Ω，R 4＝510Ω，R 5＝6.8Ω，R 6＝43Ω，
R 7=R 11=10K, R 8=51 Ω, R 9=1K, R 10Be 0.5w, 510K Ω, R 12=10K, R 13=10 Ω, R 14Be 1w, 16 Ω, R 15Be 1w, 100 Ω.
Piezo-resistance μ is 400V, 5KV, MY31
Potentiometer: W 1Be 3w, 470 Ω, W 2Be 3w, 1.5M Ω, W 3Be 0.5w, 510K, W 4Be 5w, 680 Ω;
Electrochemical capacitor: C 1=4.7 μ f, C 2=100 μ f, C 3=C 4=20 μ f;
Electric capacity: C 5=0.1 μ f, C 6=0.47, C 7=0.1 μ f, C 8=20 μ f;
Triode: BG 1, BG 2, BG 5Be 3DG12C; BG 3Be BT35C, BG 4Be 3DG6A;
Diode: D 1-9Be 2CP12, controllable silicon SCR is 3CT5A700V;
DC ammeter 0～3A, relay SJ 2Be JRXB750 Ω, 20V:
J 1Be JQX-3F3 type, 20V:J 2Be the JQX-3F3 type, 20:
Photoconductive tube is 2CU2C: voltage-stabiliser tube DW 1=DW 2=2CW18: power transformer B 2Be BK20W, 220 volts/20 volts/6.3 volts; Signal transformer primary winding 10 circles, line footpath φ is 1.35mm, secondary coil 80 circles, line footpath φ is 0.12mm; B 3Be BX20W, 220 volt (15～0-15).

Claims (8)

1, a kind of stone flour factory that is applicable to, the cement plant, the transistor auto-controller of usefulness is pulverized in magnesia ore deposits etc., it is characterized in that: constitute by shell body (17), control panel (18), panel (16), connector socket (15), control panel (18) is fixed on the back of panel (16) by screw with support, panel (16) is fixedlyed connected with rectangle shell body (17) by square head bolts, and garden shape connector socket (15) is embedded in panel (16) lower end.
2, by the described auto-controller of claim 1, it is characterized in that: the A of garden shape connector socket (15) 1A 2Join D with power supply in the host computer control case 1D 2With current transformer PT in the Raymond machine host computer control case 1The secondary coil series connection, G 1G 2Connect C with A.C. contactor CJ solenoid in the host computer control case 1C 2With the dynamo-electric current transformer PT of host computer control case apoplexy 2The secondary coil series connection, A 2H is in parallel with electromagnetic feeder coil L in the host computer control case.
3, by the described auto-controller of claim 1; it is characterized in that: on rectangle control panel (18), have current foldback circuit, delay circuit, autofeed circuit, manual feed circuit formation; all by corresponding being connected of each contact of lead and socket, the W of current foldback circuit 1, C 1, J 1-2, R 1, R 2, BG 2Emitter stage one end is connected D with delay circuit negative pole (common point Y) respectively 2Negative pole and overcurrent relay J 1Coil one end respectively with the time-delay relay SJ of delay circuit 2Normal opened contact SJ 2-3One end A ' is connected SJ 2-3" (common point B's other end A) is connected with the delay circuit positive pole, and A ' other end passes through Dz 2Indicator lamp and BG 2Emitter stage is connected; Overcurrent relay normal opened contact J 1-2One end and indicator lamp DZ 4Be connected DZ 4The other end and E 2Be connected, delay circuit positive pole (common point B) passes through C 3One end respectively with the BG of autofeed circuit 4Colelctor electrode, R 9, D 7, SJ 2-1, J 2, J 2-1One end (common point Z) is connected, the negative pole of delay circuit (common point Y) respectively with the BG of autofeed circuit 5Emitter stage, R 11, R 10One end is connected; J 2-1The other end and DZ 3One end is connected, DZ 3The other end and SJ 2-2One end (common point Y) is connected normal opened contact SJ 2-2With K 4Parallel connection, K 4Two ends are connected in series with manual feed circuit power respectively.
4, by the described auto-controller of claim 1, it is characterized in that: R 12, R 1, R 2One end respectively with selector switch K 3Both sides are connected; BG 1Base stage and K 3Central point is connected.
5, by the described auto-controller of claim 1, it is characterized in that: SJ 2-1One end respectively with delay circuit positive pole, R 3, C 3One end (common point B) is connected, its other end respectively with unijunction transistor BG 3Second base stage, SJ 2One end is connected, and carries out the delay circuit self-locking.
6, by the described auto-controller of claim 1, it is characterized in that: the rotation control flow (30) of the electromagnetism pivoting controller (28) of autofeed circuit places between illuminator DX and the photoconductive tube DU, and on a transversal line.
7, by the described auto-controller of claim 1, it is characterized in that: electromagnetism pivoting controller (28) is made of current transformer (27), support (29), rotation control flow (30), rotating coil (31), garden cylindrical magnetic iron (32), coil-end axle (33), the damping (34) of oil silk, felt pad (35).
8, by the described auto-controller of claim 1, it is characterized in that: electromagnetism pivoting controller (28) selects for use 69L11 type 5A alternating current gauge outfit to replace.
CN 91222742 1991-12-25 1991-12-25 Automatic control instrument by transistor Granted CN2119962U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 91222742 CN2119962U (en) 1991-12-25 1991-12-25 Automatic control instrument by transistor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 91222742 CN2119962U (en) 1991-12-25 1991-12-25 Automatic control instrument by transistor

Publications (1)

Publication Number Publication Date
CN2119962U true CN2119962U (en) 1992-10-28

Family

ID=4929584

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 91222742 Granted CN2119962U (en) 1991-12-25 1991-12-25 Automatic control instrument by transistor

Country Status (1)

Country Link
CN (1) CN2119962U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100462148C (en) * 2006-12-15 2009-02-18 吴爱营 Automatic feeding control method for stone-crushing machine and controller thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100462148C (en) * 2006-12-15 2009-02-18 吴爱营 Automatic feeding control method for stone-crushing machine and controller thereof

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