CN203445593U

CN203445593U - Electric leakage safety protection circuit and electric scraper circuit

Info

Publication number: CN203445593U
Application number: CN201320538207.5U
Authority: CN
Inventors: 朱为好; 肖绪刚; 周卫国
Original assignee: JCHX MINING MANAGEMENT CO Ltd
Current assignee: JCHX MINING MANAGEMENT CO Ltd
Priority date: 2013-08-30
Filing date: 2013-08-30
Publication date: 2014-02-19
Anticipated expiration: 2023-08-30

Abstract

The utility model relates to an electric leakage safety protection circuit and an electric scraper circuit. The electric leakage safety protection circuit which is used in an electric scraper comprises a first transformer, a second transformer, a first bridge type rectifier, a second bridge type rectifier, a third bridge type rectifier, a first light emitting diode, a second light emitting diode, a first diode, a second diode, a third diode, a fourth diode, a Zener diode, a first triode, a second triode, a third triode, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eight resistor, a first capacitor, a second capacitor, a relay and a mutual inductor. The electric leakage safety protection circuit and the electric scraper circuit can protect a scraper driver from being injured by high-voltage discharge generated due to electric leakage of the scraper when the driver gets on/off the scraper. The electric shock danger is alleviated.

Description

Electric leakage safety protective circuit and electric LHD circuit

Technical field

The utility model relates to dynamo-electric field, relates in particular to a kind of electric leakage safety protective circuit and electric LHD circuit.

Background technology

Electric LHD (being also called for short below forklift) is when turning round or quitting work, the cable being connected with forklift, cable rolling dish, forklift sky leaves or forklift distribution box circuit is all connected with 380V(volt) power supply, in the time of forklift normal operation, forklift driver is sitting in above forklift because behaving, if the at this moment power supply of 380V electric leakage can not constitute a threat to forklift driver, because forklift driver sits onboard, the electric leakage of forklift driver and forklift is idiostatic, so to not injury of forklift driver, and forklift has ground chain when work or scraper bowl is put into ground sometimes, this also plays certain protective role.Forklift driver is under stopping or while getting on the bus work, hand of forklift driver will be held up forklift, and pin is also underground, is also like this during lower forklift.In this case, if forklift electric leakage, because forklift driver now has potential difference over the ground, therefore can form security threat to forklift driver.

Existing earth leakage protective device; while using in down-hole because condition is poor, forklift cable has broken skin, there was dampness in the air; often can cause misoperation, thus little at underground leakage protector practical function, the potential difference that the be upper and lower forklift time electric leakage that forklift driver is directly threatened produces.Therefore, how to protect forklift driver is not a major issue urgently to be resolved hurrily by electrical leakage voltage injury when upper and lower forklift.

Fig. 1 is the circuit diagram of JD – 5 integrated protector for electric motor in prior art.JD – 5 integrated protector for electric motor are a kind of conventional earth leakage protective devices.This circuit is for forklift circuit.As shown in Figure 1; existing forklift circuit is opened QS1 from sky and is opened QS2 to earth leakage protective device and the cable sky that is connected with earth leakage protective device before work with after quitting work; all with 380V voltage, if a place leak electricity whole chassis subshell will be charged, thereby cause Danger Electric shock risk.

Utility model content

Technical problem to be solved in the utility model is to provide a kind of electric leakage safety protective circuit and electric LHD circuit, and protection forklift driver is subject to the harm to human body of electrion that forklift electric leakage produces at the Shi Buhui that gets on or off the bus, and has reduced the danger of getting an electric shock.

For solving the problems of the technologies described above, the utility model proposes a kind of electric leakage safety protective circuit, for electric LHD, comprise the first transformer, the second transformer, the first bridge rectifier, the second bridge rectifier, the 3rd bridge rectifier, the first light-emitting diode, the second light-emitting diode, the first diode, the second diode, the 3rd diode, the 4th diode, voltage stabilizing didoe, the first triode, the second triode, the 3rd triode, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the first electric capacity, the second electric capacity, relay and instrument transformer, the elementary 380V AC power that connects of the first transformer, two secondary terminals of the first transformer connect respectively the second end and the 4th end of the first bridge rectifier, the first end of the 3rd termination the first electric capacity of the first bridge rectifier, the second end of first termination the first electric capacity of the first bridge rectifier, the series circuit that the first resistance and the first light-emitting diode form is parallel to the two ends of the first electric capacity, the first end of first termination the first electric capacity of the first resistance, the positive pole of second termination the first light-emitting diode of the first resistance, the negative pole of the first light-emitting diode connects the second end of the first electric capacity, the second resistance, the series circuit that the first triode and the second light-emitting diode form is parallel to the two ends of the first electric capacity, the first end of first termination the first electric capacity of the second resistance, the emitter of second termination the first triode of the second resistance, the collector electrode of the first triode connects the positive pole of the second light-emitting diode, the negative pole of the second light-emitting diode connects the second end of the first electric capacity, the first end of first termination the first electric capacity of the 3rd resistance, the negative pole of second termination the first diode of the 3rd resistance, the positive pole of the first diode connects the collector electrode of the second triode, the emitter of the second triode connects the second end of the first electric capacity, relay and the first diodes in parallel, the 4th resistance is connected between the base stage of the first triode and the collector electrode of the second triode, the base stage of first termination the second triode of the 5th resistance, the negative pole of second termination the second diode of the 5th resistance, the positive pole of the second diode connects the elementary first end of the second transformer, the second end of elementary second termination first electric capacity of the second transformer, the second electric capacity is connected between the negative pole of the second diode and the second end of the first electric capacity, the first end of secondary the first termination the 6th resistance of the second transformer, the second end of secondary the second termination the 7th resistance of the second transformer, the elementary first end of the second transformer and the secondary first end of the second transformer are Same Name of Ends, the first end connecting terminal 11 of the second bridge rectifier, the second end of second termination the first bridge rectifier of the second bridge rectifier, the first end of the 3rd termination the 8th resistance of the second bridge rectifier, the 4th end of the 4th termination the first bridge rectifier of the second bridge rectifier, the first end of the second termination the 7th resistance of the 8th resistance, the series circuit that the 3rd diode and the 4th diode form is connected between terminal 13 and the second end of the 7th resistance, the collector electrode of the 3rd triode connects the first end of the 8th resistance, the emitter of the 3rd triode connects the second end of the 6th resistance, the positive pole of voltage stabilizing didoe connects the first end of the 8th resistance, the negative pole of voltage stabilizing didoe connects the base stage of the 3rd triode, the first end of first termination the first bridge rectifier of the 3rd bridge rectifier, between the second end of the 3rd bridge rectifier and the 4th end, be connected with instrument transformer, the negative pole of the 3rd termination the second diode of the 3rd bridge rectifier, the 4th end ground connection of the 3rd bridge rectifier.

Further, above-mentioned electric leakage safety protective circuit also can have following characteristics, and described the 8th resistance is adjustable resistance.

For solving the problems of the technologies described above, the utility model has also proposed a kind of electric LHD circuit, comprises the electric leakage safety protective circuit described in above-mentioned any one.

Electric leakage safety protective circuit of the present utility model, for electric LHD, can protect electric LHD driver to be subject to the harm to human body of electrion that forklift electric leakage produces at the Shi Buhui that gets on or off the bus, and has reduced the danger of getting an electric shock.Electric LHD circuit of the present utility model, when having kept the function of forklift primary circuit, can also protect forklift driver to be subject to the harm to human body of electrion that forklift electric leakage produces at the Shi Buhui that gets on or off the bus, and has reduced the danger of getting an electric shock.

Accompanying drawing explanation

Fig. 1 is the circuit diagram of JD – 5 integrated protector for electric motor in prior art;

Fig. 2 is the circuit diagram of safety protective circuit of leaking electricity in the utility model embodiment;

Fig. 3 is the circuit diagram of electric LHD in the utility model embodiment.

Embodiment

Below in conjunction with accompanying drawing, principle of the present utility model and feature are described, example, only for explaining the utility model, is not intended to limit scope of the present utility model.

Fig. 2 is the circuit diagram of safety protective circuit of leaking electricity in the utility model embodiment.As shown in Figure 2; in the present embodiment, electric leakage safety protective circuit comprises transformer BK1, transformer BK2, bridge rectifier ZL1, bridge rectifier ZL2, bridge rectifier ZL3, light-emitting diode VD1, light-emitting diode VD2, diode DZ1, diode DZ2, diode DZ3, diode DZ4, voltage stabilizing didoe DZ5, triode Q1, triode Q2, triode Q3, resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7, resistance R 8, capacitor C 1, capacitor C 2, relay J and instrument transformer TA.

In Fig. 2, the elementary 380V AC power that connects of transformer BK1, two secondary terminals of transformer BK1 connect respectively the second end (i.e. terminal in figure 7) and the 4th end (i.e. terminal in figure 8) of bridge rectifier ZL1, the 3rd end of bridge rectifier ZL1 (i.e. terminal in figure 10) connects the first end of capacitor C 1, the first end of bridge rectifier ZL1 (i.e. terminal in figure 9) connects the second end of capacitor C 1, the series circuit that resistance R 1 and light-emitting diode VD1 form is parallel to the two ends of capacitor C 1, the first end of the first termination capacitor C 1 of resistance R 1, the positive pole of the second termination light-emitting diode VD1 of resistance R 1, the negative pole of light-emitting diode VD1 connects the second end of capacitor C 1, resistance R 2, the series circuit that triode Q1 and light-emitting diode VD2 form is parallel to the two ends of capacitor C 1, the first end of the first termination capacitor C 1 of resistance R 2, the emitter of the second termination triode Q1 of resistance R 2, the positive pole of the collector electrode sending and receiving optical diode VD2 of triode Q1, the negative pole of light-emitting diode VD2 connects the second end of capacitor C 1, the first end of the first termination capacitor C 1 of resistance R 3, the negative pole of the second terminating diode DZ1 of resistance R 3, the positive pole of diode DZ1 connects the collector electrode of triode Q2, the emitter of triode Q2 connects the second end of capacitor C 1, relay J is in parallel with diode DZ1, resistance R 4 is connected between the base stage of triode Q1 and the collector electrode of triode Q2, the base stage of the first termination triode Q2 of resistance R 5, the negative pole of the second terminating diode DZ2 of resistance R 5, the elementary first end of the cathode connecting transformer BK2 of diode DZ2, the second end of elementary the second termination capacitor C1 of transformer BK2, capacitor C 2 is connected between the negative pole of diode DZ2 and the second end of capacitor C 1, the first end of the secondary first end connecting resistance R6 of transformer BK2, the second end of secondary the second terminating resistor R7 of transformer BK2, the elementary first end of transformer BK2 and the secondary first end of transformer BK2 are Same Name of Ends.Transformer BK2 secondary voltage is 12V.

In Fig. 2, the first end connecting terminal 11 of bridge rectifier ZL2, the second end of the second termination bridge rectifier ZL1 of bridge rectifier ZL2, the first end of the 3rd end of bridge rectifier ZL2 (i.e. terminal in figure 12) connecting resistance R8, the 4th end of the 4th termination bridge rectifier ZL1 of bridge rectifier ZL2, the first end of the second terminating resistor R7 of resistance R 8, the series circuit that diode DZ3 and diode DZ4 form is connected between terminal 13 and the second end of resistance R 7, the first end of the collector electrode connecting resistance R8 of triode Q3, the second end of the emitter connecting resistance R6 of triode Q3, the first end of the anodal connecting resistance R8 of voltage stabilizing didoe DZ5, the negative pole of voltage stabilizing didoe DZ5 connects the base stage of triode Q3, resistance R X(RX is the control transformer of forklift) and the series circuit that forms of switch be connected between terminal 11 and terminal 13.Circuit in Fig. 2 in larger dotted line frame is for starting loop (noticing that starting loop is not the circuit in less dotted line frame in Fig. 2, the series circuit that resistance R X and switch form).The switch of connecting with resistance R X is the button of forklift.The series circuit that resistance R X and switch form does not belong to electric leakage safety protective circuit of the present utility model, but belongs to the integrated circuit of the applied forklift of this electric leakage safety protective circuit.

In Fig. 2, the first end of the first termination bridge rectifier ZL1 of bridge rectifier ZL3, between the second end of bridge rectifier ZL3 (i.e. terminal in figure 14) and the 4th end (i.e. terminal in figure 15), be connected with instrument transformer TA, the 3rd end of bridge rectifier ZL3 (i.e. terminal in figure 16) connects the negative pole of diode DZ2, the 4th end ground connection of bridge rectifier ZL3.

Wherein, resistance R 8 is adjustable resistance.

Wherein, transformer BK2 can be general 1VA(watt) power transformer.

In the utility model embodiment, in Fig. 2, the parameter of each element can be as shown in table 1.Element title and the component parameters table of comparisons in table 1 Fig. 2

Sequence number	Title	Component parameters
				1	BK1	380/36V/500VA
2	ZL1	1N4004
			3	C1	50V/1000UF
4	R1	6.7K
			5	VD1	1.5V/15MA
6	R2	6.7K
			7	Q1	8550
8	VD2	1.5V/15MA
			9	R4	131.4K
10	R3	1.2K/1.5W
			11	J	JQX-13FDC24V
12	DZ1	1N4004
			13	Q2	9014
14	R5	1K
			15	C2	10V/2.2UF
16	DZ2	1N4004
			17	BK2	380/12V/1VA
18	R6	44Ω/1.5W
			19	Q3	E13003
20	DZ5	C12ST
			21	R7	5Ω/50W

22	R8	100Ω/50W
			23	ZL2	FR307
24	DZ3	FR307
			25	DZ4	FR307
26	ZL3	1N4004
			27	TA	100/5

The operation principle of circuit shown in Fig. 2 is: 380V AC power is transformed into 36V alternating voltage through transformer BK1, and then through bridge rectifier ZL1 rectification and capacitor C 1 filtering, is transformed into 50V direct voltage.This 50V direct voltage is given respectively light-emitting diode VD1, light-emitting diode VD2, relay J power supply through resistance R 1, resistance R 2, resistance R 3.When terminal 11 be externally connected to load and button time, if pressed the button, the 36V AC power of BK1 level of transformer is exported 50V direct voltage after bridge rectifier ZL2 rectification, this 50V direct voltage is through resistance R 8, resistance R 7 and diode DZ3, diode DZ4, terminal 13, resistance R X, terminal 11 forms loop, simultaneously in resistance R 8, a loop in parallel, resistance R 7 two ends, this time routing zener DZ5, triode Q3, resistance R 6 is connected with the Same Name of Ends of pulse transformer BK2, the other end of the BK2 of pulse transformer is connected with the common port of diode DZ3 with resistance R 7.If it is enough large at this moment to start the electric current in loop, cause resistance R 8, when the voltage drop at resistance R 7 two ends reaches the puncture voltage of voltage stabilizing didoe DZ5, the elementary of pulse transformer BK2 can produce a pulse voltage, the secondary of pulse transformer BK2 also can produce the pulse voltage of a 3～6V by magnetic induction principle simultaneously, this pulse voltage is through diode DZ2, the voltage that resistance R 5 step-down current limlitings become 1～1.5V is sent into the base stage of triode Q2 again, the base stage of triode Q2 is subject to forward bias voltage and saturation conduction, make relay J obtain electric and work, and triode Q1 is also because of base stage forward bias saturation conduction, make the luminous indication of light-emitting diode VD2 as relay indicating light.Energising work due to relay J, the normal battle of J, just the coil electricity of the contactor of the forklift that will control is worked, because major loop obtains electric, so the secondary of instrument transformer TA will induce electric current, this induced current passes through the direct voltage that bridge rectifier ZL3 rectification becomes 3～6V again, and the direct voltage of this 3～6V obtains 1～1.5V voltage through the step-down of resistance R 5, give triode Q2 power supply, make relay J because there being current signal, obtain electric maintenance.Start loop by the auxiliary contact of major loop automatic disconnection terminal 11, and the other end 13 that starts loop is subject to reverse voltage automatic cut-off because of diode DZ4 and diode DZ3, has so just protected startup loop can not burnt because of high voltage.

Visible, electric leakage safety protective circuit of the present utility model, for electric LHD, can protect electric LHD driver to be subject to the harm to human body of electrion that forklift electric leakage produces at the Shi Buhui that gets on or off the bus, and has reduced the danger of getting an electric shock.

Fig. 3 is the circuit diagram of electric LHD in the utility model embodiment.As shown in Figure 3, the circuit of this electric LHD comprises the electric leakage safety protective circuit shown in Fig. 2.Below in conjunction with Fig. 3, illustrate how electric leakage safety protective circuit of the present utility model carries out earth leakage protective.

Referring to Fig. 3, before electric LHD driver gets on the bus, switch is placed in automated location, and sky is opened [1] closure, and sky is opened [2] closure.Whole electric LHD and cable are connected the DC low voltage power supply of 50V.Step-down mode is as follows: by sky, open [1], process resistance R D1, resistance R D2 are to control transformer BK1, the elementary low-tension supply that 380V voltage transformation is become to 36V of transformer BK1, pass through again bridge rectifier, the filtering of bridge rectifier ZL1, become the DC power supply of low pressure 50V, through resistance step-down, give relay, triode and indicator light power supply.

Referring to Fig. 3, after electric LHD driver gets on the bus, first driver checks instrument, instrument, whether advances, retreats switch in normal position, after all are normal, presses the start button of electric LHD, and scraper is started working.The transfer process of voltage is as follows: first, the low-voltage alternating current power supply of 36V, through secondary, the bridge rectifier ZL2 of transformer BK1, becomes the DC voltage power supply of 50V.Closed-loop path: starting resistance R7, resistance R 8, rectifier diode RF307[1], rectifier diode RF307[2], switch X21, sky drive [2], switch X22, insurance RD4, control transformer BK3, two normally closed contacts of intermediate relay ZJ, protective tube RD3, switch X32, air switch [2], switch X31, main contactor two normally closed contact C series connection, the negative pole of bridge rectifier ZL2 forms loop.

Implementation method: starting resistance R 7, resistance R 8 in loop has electric current to pass through, completes by regulating resistance R8 resistance value that (two ends of two resistance R 7, R8 produce a pressure drop, and this pressure drop is also that the resistance with this resistance is directly proportional; Be directly proportional to electric current).1 loop in parallel, two ends at this resistance, by 1 voltage stabilizing didoe DZ5([C12ST]) with triode Q3(E13003) base stage connect, triode Q3(E13003) connect again 1 current-limiting resistance R5, pulse transformer BK2, FR307[1 of emitter], reach and control the big or small object that starts loop current.

Electric LHD driver is when pressing start button, starting current is by starting resistance R7, the two ends of resistance R 8 produce a pressure drop, this pressure drop can regulate according to the size of starting current, take and reach voltage stabilizing didoe and puncture as good, the elementary of pulse transformer BK2 can produce 1 pulse signal like this, secondary passes through magnetic induction principle, at the inferior utmost point, also produce the d. c. voltage signal that 1 low pressure is 1～3V, this voltage is by diode DZ2, filter capacitor C2, current-limiting resistance R5, the base stage of triode Q2 adds that forward bias makes triode Q2 energising conducting, be equivalent to like this relay J coil electricity, the conducting because the conducting of triode Q2 makes triode Q1 base stage forward bias, the light-emitting diode of work indication is bright, at this moment the voltage of electric LHD cable becomes 380V, the operation of electric LHD electric motor starting, instrument transformer is because there is electric current to pass through simultaneously, so secondary generation current signal at instrument transformer, this current signal becomes the direct voltage of direct current 3～6V by bridge rectifier ZL3, then the base stage that the resistance current limliting of process 1K enters triode Q1, make triode keep conducting, the coil that is to say J keeps by triode Q1, the normally open contact of J is just communicated with main contactor C coil with 380V voltage like this, main circuit power is maintained.

Referring to Fig. 3, when electric LHD driver need to stop, as long as press stop button, circuit main contactor C power-off, electric LHD main contactor KM power-off, control transformer BK3 power-off, a whole like this electric LHD and cable are all 50V direct voltages.

Visible, the electric LHD circuit shown in Fig. 3, when having kept the function of forklift primary circuit, can also protect forklift driver to be subject to the harm to human body of electrion that forklift electric leakage produces at the Shi Buhui that gets on or off the bus, and has reduced the danger of getting an electric shock.

The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.

Claims

One kind electric leakage safety protective circuit, for electric LHD, it is characterized in that, comprise the first transformer, the second transformer, the first bridge rectifier, the second bridge rectifier, the 3rd bridge rectifier, the first light-emitting diode, the second light-emitting diode, the first diode, the second diode, the 3rd diode, the 4th diode, voltage stabilizing didoe, the first triode, the second triode, the 3rd triode, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the first electric capacity, the second electric capacity, relay and instrument transformer, the elementary 380V AC power that connects of the first transformer, two secondary terminals of the first transformer connect respectively the second end and the 4th end of the first bridge rectifier, the first end of the 3rd termination the first electric capacity of the first bridge rectifier, the second end of first termination the first electric capacity of the first bridge rectifier, the series circuit that the first resistance and the first light-emitting diode form is parallel to the two ends of the first electric capacity, the first end of first termination the first electric capacity of the first resistance, the positive pole of second termination the first light-emitting diode of the first resistance, the negative pole of the first light-emitting diode connects the second end of the first electric capacity, the second resistance, the series circuit that the first triode and the second light-emitting diode form is parallel to the two ends of the first electric capacity, the first end of first termination the first electric capacity of the second resistance, the emitter of second termination the first triode of the second resistance, the collector electrode of the first triode connects the positive pole of the second light-emitting diode, the negative pole of the second light-emitting diode connects the second end of the first electric capacity, the first end of first termination the first electric capacity of the 3rd resistance, the negative pole of second termination the first diode of the 3rd resistance, the positive pole of the first diode connects the collector electrode of the second triode, the emitter of the second triode connects the second end of the first electric capacity, relay and the first diodes in parallel, the 4th resistance is connected between the base stage of the first triode and the collector electrode of the second triode, the base stage of first termination the second triode of the 5th resistance, the negative pole of second termination the second diode of the 5th resistance, the positive pole of the second diode connects the elementary first end of the second transformer, the second end of elementary second termination first electric capacity of the second transformer, the second electric capacity is connected between the negative pole of the second diode and the second end of the first electric capacity, the first end of secondary the first termination the 6th resistance of the second transformer, the second end of secondary the second termination the 7th resistance of the second transformer, the elementary first end of the second transformer and the secondary first end of the second transformer are Same Name of Ends, the first end connecting terminal (11) of the second bridge rectifier, the second end of second termination the first bridge rectifier of the second bridge rectifier, the first end of the 3rd termination the 8th resistance of the second bridge rectifier, the 4th end of the 4th termination the first bridge rectifier of the second bridge rectifier, the first end of the second termination the 7th resistance of the 8th resistance, the series circuit that the 3rd diode and the 4th diode form is connected between terminal (13) and the second end of the 7th resistance, the collector electrode of the 3rd triode connects the first end of the 8th resistance, the emitter of the 3rd triode connects the second end of the 6th resistance, the positive pole of voltage stabilizing didoe connects the first end of the 8th resistance, the negative pole of voltage stabilizing didoe connects the base stage of the 3rd triode, the first end of first termination the first bridge rectifier of the 3rd bridge rectifier, between the second end of the 3rd bridge rectifier and the 4th end, be connected with instrument transformer, the negative pole of the 3rd termination the second diode of the 3rd bridge rectifier, the 4th end ground connection of the 3rd bridge rectifier.
2. electric leakage safety protective circuit according to claim 1, is characterized in that, described the 8th resistance is adjustable resistance.
3. an electric LHD circuit, is characterized in that, comprises the electric leakage safety protective circuit described in claim 1 or 2.