CN203166471U - Safety type electrostatic grounding alarm interlocking controller of chemical inflammable product handling vehicle - Google Patents
Safety type electrostatic grounding alarm interlocking controller of chemical inflammable product handling vehicle Download PDFInfo
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- CN203166471U CN203166471U CN 201320080269 CN201320080269U CN203166471U CN 203166471 U CN203166471 U CN 203166471U CN 201320080269 CN201320080269 CN 201320080269 CN 201320080269 U CN201320080269 U CN 201320080269U CN 203166471 U CN203166471 U CN 203166471U
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Abstract
The utility model, which belongs to the field of grounding security alarm equipment for inflammable product handling equipment, relates to a safety type electrostatic grounding alarm interlocking controller of a chemical inflammable product handling vehicle. The interlocking controller is characterized in that the controller comprises a ground alarm output unit arranged at the spot and an interlocking control unit arranged indoors; the ground alarm output unit is connected with the interlocking control unit and transmits an outputted contact signal to the interlocking control unit; and the interlocking control unit that is connected with a contactor for controlling the work of the handing equipment receives the contact signal from the ground alarm output unit and then control the working state of the handing equipment. With utilization of the controller, a power supply loop of the handing equipment can be automatically cut off when the vehicle body and a conveying pipeline are not grounded reliably; and meanwhile, only microamp-level currents are generated at the loop of the ground terminal, thereby ensuring the security during the material conveying process.
Description
Technical field
Safety-type chemical industry inflammable thing loading-unloading vehicle electrostatic grounding warning interlocked control device belongs to inflammable thing handling facilities grounding safety warning device field.Be specifically related to a kind of inflammable thing loading-unloading vehicle automatic interlocked control device that cuts off handling facilities in the time that ground cannot not be abutted against.
Background technology
Chemical products (alkane, alkene, hydrocarbon, benzene class) have inflammable and explosive physical characteristic, and their minimum explosivity limit is below 3.0%VOL, very easily because static and initiation fire accident.In the loading and unloading and transportation of chemical products, chemical products very easily and between the cavity of conveyance conduit and loading-unloading vehicle produce electrostatic spark, thereby breaking out of fire even blast are because the static release work of car body and conveyance conduit of carrying out in the cargo handling process of chemical products becomes particularly important.
According to safety requirements, the loading and unloading of chemical industry inflammable thing must be carried out the work that static discharges ground connection, and what current common static release device adopted is the electrostatic grounding alarm.The electrostatic grounding alarm carries out ground connection with the feed tube of loading and unloading on the one hand, car body with loading-unloading vehicle carries out ground connection on the other hand, but this class alarm has following defective: 1, can't realize the interlock of handling facilities, when feed tube or car body cannot not be abutted against ground, handling facilities are operation as usual, is easy to cause fire hazard; 2, the electrostatic grounding alarm is with car body ground connection the time, car body is as the part of grounded circuit, and milliampere electric current of level of wherein can flowing through is in case the size of current value has surpassed the minimum ignition current of chemical products defined, still the chemical products of loading and unloading might be ignited, cause danger.
Summary of the invention
The technical problems to be solved in the utility model is: overcome the deficiencies in the prior art, provide a kind of and can be when car body and conveyance conduit cannot not be abutted against ground automatically the current supply circuit of handling facilities be cut off, simultaneously the safety-type chemical industry inflammable thing loading-unloading vehicle electrostatic grounding warning interlocked control device that has only the microampere order electric current to produce in the earth terminal loop.
The technical scheme that its technical problem that solves the utility model adopts is: this safety-type chemical industry inflammable thing loading-unloading vehicle electrostatic grounding warning interlocked control device, it is characterized in that: comprise being positioned at on-the-spot grounding alarm output unit and being positioned at indoor interlocked control unit, the grounding alarm output unit links to each other with the interlocked control unit, and with output contact point signal be sent to the interlocked control unit, the interlocked control unit links to each other with the contactor of control handling facilities work, the interlocked control unit receives after the contact point signal of grounding alarm output unit, and the operating state of handling facilities is controlled.
Described grounding alarm output unit comprises: battery pack, first signal output module and first relay module; Battery pack links to each other with first relay module with first signal output module simultaneously and powers for it, and first signal output module links to each other with first relay module.
Described interlocked control unit comprises: power transfer module, secondary signal output module and second relay module; Power transfer module links to each other with second relay module with the secondary signal output module simultaneously and powers for it, the secondary signal output module links to each other with second relay module, and second relay module links to each other with the power supply coil of the contactor of control handling facilities work.
Described first signal output module comprises resistance R 1 ~ R6, triode VT1, loud speaker LS1 and integrated operational amplifier U1, the anodal end of parallel resistance R1 ~ R2 simultaneously of power supply 5V and the positive pole of loud speaker LS1, the other end of resistance R 1 ~ R2 is parallel to inverting input and the normal phase input end of integrated operational amplifier U1 respectively, be parallel with resistance R 3 between the inverting input of integrated operational amplifier U1 and the output, the output of integrated operational amplifier U1 is the end of parallel resistance R5 simultaneously, the end of the other end while parallel resistance R6 of resistance R 5 and the base stage of triode VT1, the other end ground connection of the collector electrode of triode VT1 and resistance R 6, the emitter of triode VT1 links to each other with the negative pole of loud speaker LS1; The normal phase input end of integrated operational amplifier U1 is the end of parallel resistance R4 simultaneously, the other end series wiring terminal of resistance R 4 1. ~ 2. and binding post 3. ~ 4. after ground connection; Lead to signal output terminal E1 between the emitter of the negative pole of loud speaker LS1 and triode VT1 simultaneously.
Described secondary signal output module comprises resistance R 7 ~ R13, triode VT2 and integrated operational amplifier U2, the anodal end of parallel resistance R7, resistance R 8 and resistance R 13 simultaneously of power supply 5V, the other end of resistance R 7, resistance R 8 is parallel to inverting input and the normal phase input end of integrated operational amplifier U2 respectively, and the other end of resistance R 13 links to each other with the emitter of triode VT2; Be parallel with resistance R 9 between the inverting input of integrated operational amplifier U2 and the output, the output of integrated operational amplifier U2 is the end of parallel resistance R11 simultaneously, the end of the other end while parallel resistance R12 of resistance R 11 and the base stage of triode VT2, the other end ground connection of the collector electrode of triode VT2 and resistance R 12; The normal phase input end of integrated operational amplifier U2 is the end of parallel resistance R10 simultaneously, the other end series wiring terminal of resistance R 10 5. ~ 6. after ground connection; Lead to signal output terminal E2 between the emitter of resistance R 13 and triode VT2.
What described first relay module adopted is low level trigger relay module.
What described second relay module adopted is low level trigger relay module.
Compared with prior art, the beneficial effect that has of safety-type chemical industry inflammable thing loading-unloading vehicle electrostatic grounding warning interlocked control device of the present utility model is:
1, the utility model can be when loading-unloading vehicle car body and conveyance conduit cannot not be abutted against ground cuts off the current supply circuit of handling facilities automatically, has realized interlocked control;
2, the operating current in the circuit of outdoor application is microampere order, is far smaller than the current value of the minimum ignition current of all fuel gas, uses safer;
3, when loading-unloading vehicle car body or conveyance conduit took place to be abutted against earth fault, alarm signal was sent by loud speaker simultaneously in the scene, and its imperfect earth state is warned;
4, simple in structure, dependable performance.
Description of drawings
Fig. 1 is safety-type chemical industry inflammable thing loading-unloading vehicle electrostatic grounding warning interlocked control device structure block diagram.
Fig. 2 is safety-type chemical industry inflammable thing loading-unloading vehicle electrostatic grounding warning interlocked control device grounding alarm output unit structure block diagram.
Fig. 3 is safety-type chemical industry inflammable thing loading-unloading vehicle electrostatic grounding warning interlocked control device interlocked control cell schematics.
Fig. 4 is the safety-type chemical industry inflammable thing loading-unloading vehicle electrostatic grounding warning interlocked control device first signal output module circuit theory diagrams.
Fig. 5 is safety-type chemical industry inflammable thing loading-unloading vehicle electrostatic grounding warning interlocked control device secondary signal output module circuit theory diagrams.
Embodiment
Fig. 1 ~ 5th, most preferred embodiment of the present utility model is described further below in conjunction with 1 ~ 5 pair of the utility model of accompanying drawing.
As shown in Figure 1, safety-type chemical industry inflammable thing loading-unloading vehicle electrostatic grounding warning interlocked control device of the present utility model is made up of following two parts: be positioned at on-the-spot grounding alarm output unit and be positioned at indoor interlocked control unit, the grounding alarm output unit links to each other with the interlocked control unit, and the interlocked control unit links to each other with the contactor of control handling facilities work.The grounding alarm output unit is for loading-unloading vehicle and the conveyance conduit reliable ground that will load and unload, in case the phenomenon that loading-unloading vehicle car body or conveyance conduit cannot not be abutted against ground takes place, the grounding alarm output unit gives the alarm and reminds the field personnel to handle, and the output contact signal is passed to the interlocked control unit simultaneously; The interlocked control unit receives after the contact point signal that the grounding alarm output unit sends, and the power supply of contactor that will the work of control handling facilities is cut off, and handling facilities quit work, and avoid causing danger.
As shown in Figure 2, the grounding alarm output unit comprises: battery pack, first signal output module and first relay module.Battery pack is first signal output module and the power supply of first relay module simultaneously, and first signal output module links to each other with first relay module.When the scene situation that loading-unloading vehicle or conveyance conduit cannot not be abutted against ground occurs and takes place, first signal output module alarm signal of sounding, to remind the staff to handle, send contact point signal simultaneously and be passed to first relay module, first relay module is moved after receiving this contact point signal, normally opened contact closure in it, normally-closed contact disconnects, and the contact point signal that contact action produces is passed to is positioned at indoor interlocked control unit, carried out next step interlocked control by the interlocked control unit.
In the present embodiment, the battery pack in the grounding alarm output unit is in series by three common joint 1.5V dry cells.What first relay module adopted is commercially available low level trigger relay module, this low level trigger relay module input comprises three terminals: power supply anodal, power negative pole and driving signal input, wherein power supply positive and negative electrode anodal, power negative pole and battery pack is in parallel, and driving signal input links to each other with first signal output module.Low level trigger relay module output comprises a normally opened contact and a normally-closed contact, in the present embodiment, in the circuit by interlocked control unit that the normally-closed contact of first relay module is connected, be grounded the connection between warning output unit and the interlocked control unit, again because first relay module only is passed to the interlocked control unit with the contact point signal of the action of the normally-closed contact in it, so in the process of signal transmission, current value is minimum, have only microampere order, thereby guaranteed the fail safe that on-site signal transmits.
As shown in Figure 3, the interlocked control unit comprises: power transfer module, secondary signal output module and second relay module.Power transfer module is secondary signal output module and the power supply of second relay module simultaneously, and the secondary signal output module links to each other with second relay module, and second relay module links to each other with the power supply coil of the contactor of control handling facilities work.The normally-closed contact of the first above-mentioned relay module is connected in the secondary signal output module, and when the normally-closed contact of first relay module disconnects, secondary signal output module output signal, and this signal is passed to second relay module, second relay module receives the normally opened contact closure in it of action behind this signal, normally-closed contact disconnects, and the contact point signal that the contact action is produced is passed to the contactor of controlling handling facilities work, the operating state of control handling facilities.
In the present embodiment, the power transfer module in the interlocked control unit adopts commercially available common Switching Power Supply, and the 220V alternating current is converted to the 5V direct current.What second relay module adopted equally is low level trigger relay module, and the power supply positive pole of this low level trigger relay module, power supply negative pole and power transfer module are in parallel, and driving signal input links to each other with the secondary signal output module.The normally-closed contact of second relay module is connected in the current supply circuit of power supply coil of contactor of control handling facilities work.
Be illustrated in figure 4 as the circuit theory diagrams of first signal output module, comprise resistance R 1 ~ R6, triode VT1, loud speaker LS1 and integrated operational amplifier U1.The anodal end of parallel resistance R1 ~ R2 simultaneously of power supply 5V and the positive pole of loud speaker LS1, the other end of resistance R 1 ~ R2 is parallel to inverting input and the normal phase input end of integrated operational amplifier U1 respectively, be parallel with resistance R 3 between the inverting input of integrated operational amplifier U1 and the output, the output of integrated operational amplifier U1 is the end of parallel resistance R5 simultaneously, the end of the other end while parallel resistance R6 of resistance R 5 and the base stage of triode VT1, the other end ground connection of the collector electrode of triode VT1 and resistance R 6, the emitter of triode VT1 links to each other with the negative pole of loud speaker LS1.The normal phase input end of integrated operational amplifier U1 is the end of parallel resistance R4 simultaneously, the other end series wiring terminal of resistance R 4 1. ~ 2. and binding post 3. ~ 4. after ground connection.1. ~ 2. binding post is the binding clip of outdoor the earth earth point, binding post is 3. ~ 4. for being clipped in the earth clip on loading-unloading vehicle or the conveyance conduit, when loading-unloading vehicle or conveyance conduit reliable ground, binding post 1. ~ 2. and binding post be path between 3. ~ 4., this moment resistance R 4 other end ground connection.The ground connection of the collector electrode of triode VT1 and resistance R 4 place is the ground of the reference in the circuit, the i.e. negative pole of power supply 5V in this circuit.Parallel connection goes out signal output terminal E1 between the emitter of the negative pole of loud speaker LS1 and triode VT1, and signal output terminal E1 links to each other with the driving signal input of first relay module.
By the circuit theory diagrams of first signal output module shown in Figure 4 as can be known, this circuit is that core has been formed voltage comparator circuit with integrated operational amplifier U1, binding post 1. ~ 2. and binding post 3. ~ when 4. connecting, make the input voltage of the normal phase input end of integrated operational amplifier U1 and inverting input identical by resistors match, this moment, integrated operational amplifier U1 did not carry out the amplification of signal, its output no-voltage output, triode VT1 is in cut-off state, and loud speaker LS1 does not send chimes of doom.When binding post 1. ~ 2. or binding post when 3. ~ 4. any place disconnects, the poised state of the input terminal voltage of integrated operational amplifier U1 is destroyed, output has voltage output, and this signal makes triode VT1 conducting, loud speaker LS1 connects and sends chimes of doom, and this moment, signal output terminal E1 went out to have simultaneously current signal output, in order to drive the action of first relay module, this moment, the normally-closed contact of first relay module disconnected the normally opened contact adhesive.
3. ~ 4. 1. ~ 2. binding post in first signal output module shown in Figure 4 be connected for on-the-spot circuit with binding post, the current value in this loop of flowing through is the microampere order electric current, be far smaller than the current value of the minimum ignition current of fuel gas, other parts of circuit are positioned at anti-explosion terminal box, be isolated with the fuel gas at scene, guaranteed the fail safe that safety-type chemical industry inflammable thing loading-unloading vehicle electrostatic grounding warning interlocked control device of the present utility model uses to the full extent.Simultaneously, when the first signal output module operate as normal, because integrated operational amplifier U1 is in poised state, integrated operational amplifier U1 does not play amplification, the output of output no signal is so adopt three joint dry cells can use for a long time when normally using as power supply.
Be illustrated in figure 5 as the circuit theory diagrams of secondary signal output module, comprise resistance R 7 ~ R13, triode VT2 and integrated operational amplifier U2.The anodal end of parallel resistance R7, resistance R 8 and resistance R 13 simultaneously of power supply 5V, the other end of resistance R 7, resistance R 8 is parallel to inverting input and the normal phase input end of integrated operational amplifier U2 respectively, and the other end of resistance R 13 links to each other with the emitter of triode VT2.Be parallel with resistance R 9 between the inverting input of integrated operational amplifier U2 and the output, the output of integrated operational amplifier U2 is the end of parallel resistance R11 simultaneously, the end of the other end while parallel resistance R12 of resistance R 11 and the base stage of triode VT2, the other end ground connection of the collector electrode of triode VT2 and resistance R 12.The normal phase input end of integrated operational amplifier U2 is the end of parallel resistance R10 simultaneously, the other end series wiring terminal of resistance R 10 5. ~ 6. after ground connection.Binding post 5. ~ 6. between the series connection first relay module normally-closed contact, when first relay module was failure to actuate, resistance R 10 was connected in parallel between the normal phase input end and earth terminal of integrated operational amplifier U2.The ground connection of the collector electrode of triode VT2 and resistance R 10 place is the ground of the reference in the circuit, the i.e. negative pole of Switching Power Supply 5V in this circuit.Parallel connection goes out signal output terminal E2 between the emitter of resistance R 13 and triode VT2, and signal output terminal E2 links to each other with the driving signal input of second relay module.
By the circuit theory diagrams of secondary signal output module shown in Figure 5 as can be known, this circuit is that core has been formed voltage comparator circuit with integrated operational amplifier U2, binding post 5. ~ when 6. connecting, make the input voltage of the normal phase input end of integrated operational amplifier U2 and inverting input identical by resistors match, this moment, integrated operational amplifier did not carry out the amplification of signal, its output no-voltage output, triode VT2 is in cut-off state.When binding post 5. ~ when 6. disconnecting, the poised state of the input terminal voltage of integrated operational amplifier U2 is destroyed, and output has voltage output, and this signal makes triode VT2 conducting, this moment, signal output terminal E2 went out to have simultaneously current signal output, in order to drive the action of second relay module.In the current supply circuit of the power supply coil of the contactor of the normally-closed contact access control handling facilities work of second relay module, when second relay module does not receive the driving signal that signal output terminal E2 sends over, the normally-closed contact adhesive of second relay module, the power supply of handling facilities normally is the handling facilities power supply by contactor, the handling facilities operate as normal, when signal output terminal E2 has the signal of driving to send, the action of second relay module, its normally-closed contact disconnects, the power supply coil power down of contactor, the power supply of handling facilities stops to be its power supply that handling facilities quit work.
The concrete course of work is as follows:
When safety-type chemical industry inflammable thing loading-unloading vehicle electrostatic grounding warning interlocked control device of the present utility model normally uses, 1. ~ 2. the binding post that at first will be arranged in first signal output module of on-the-spot grounding alarm output unit is connected with outdoor the earth earth point, 3. ~ 4. binding post is connected with loading-unloading vehicle or conveyance conduit, this moment, the circuit of first signal output module was in poised state, the output of the first signal output module no signal, first relay module is failure to actuate, its normally-closed contact keeps the state of adhesive, thereby the feasible circuit that is arranged in the secondary signal output module of indoor interlocked control unit is in poised state, the output of secondary signal output module no signal, second relay module is failure to actuate, its normally-closed contact keeps the state of adhesive, thereby make the contactor operate as normal, the power supply of handling facilities is normally powered to handling facilities, the handling facilities operate as normal.
When the binding post that is clipped in loading-unloading vehicle or conveyance conduit 3. ~ 4. or the binding post that is connected with the earth earth point 1. ~ when 2. disconnecting, be positioned at the circuit disequilibrium of first signal output module of on-the-spot grounding alarm output unit, and send signal to first relay module, first relay module is moved after receiving signal, its normally-closed contact disconnects, because this normally-closed contact is series in the secondary signal output module of interlocked control unit, so same disequilibrium of circuit in the secondary signal output module, can send the driving signal to second relay module simultaneously, second relay module is moved after receiving this signal, its normally-closed contact disconnects, thereby cut off the current supply circuit of contactor, contactor power-down actions, the power supply of handling facilities stop to be the handling facilities power supply that handling facilities quit work.
Be positioned at first signal output module of on-the-spot grounding alarm output unit when sending contact point signal, the loud speaker LS1 in it sends alarm signal, reminds on-the-spot staff that field condition is confirmed, carries out troubleshooting of faults.
In the utility model, what integrated operational amplifier U1 and integrated operational amplifier U2 adopted is the LM324 chip, can also adopt the chip of other models, as: LM358, LM339, LM393, TL081 234, OP07, OP27.What triode VT1 ~ VT2 adopted is the positive-negative-positive triode, and available commercially available most of positive-negative-positive triode replaces.
In the utility model, described handling facilities by contactor control comprise the used various loading and unloading devices of chemical industry on-the-spot loading and unloading material such as loading and unloading motor, loading and unloading pump, loading and unloading stop valve.
The above, it only is preferred embodiment of the present utility model, be not to be the restriction of the utility model being made other form, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But every technical solutions of the utility model content that do not break away to any simple modification, equivalent variations and remodeling that above embodiment does, still belongs to the protection range of technical solutions of the utility model according to technical spirit of the present utility model.
Claims (7)
1. safety-type chemical industry inflammable thing loading-unloading vehicle electrostatic grounding warning interlocked control device, it is characterized in that: comprise being positioned at on-the-spot grounding alarm output unit and being positioned at indoor interlocked control unit, the grounding alarm output unit links to each other with the interlocked control unit, and with output contact point signal be sent to the interlocked control unit, the interlocked control unit links to each other with the contactor of control handling facilities work, the interlocked control unit receives after the contact point signal of grounding alarm output unit, and the operating state of handling facilities is controlled.
2. safety-type chemical industry inflammable thing loading-unloading vehicle electrostatic grounding warning interlocked control device according to claim 1, it is characterized in that: described grounding alarm output unit comprises: battery pack, first signal output module and first relay module; Battery pack links to each other with first relay module with first signal output module simultaneously and powers for it, and first signal output module links to each other with first relay module.
3. safety-type chemical industry inflammable thing loading-unloading vehicle electrostatic grounding warning interlocked control device according to claim 1, it is characterized in that: described interlocked control unit comprises: power transfer module, secondary signal output module and second relay module; Power transfer module links to each other with second relay module with the secondary signal output module simultaneously and powers for it, the secondary signal output module links to each other with second relay module, and second relay module links to each other with the power supply coil of the contactor of control handling facilities work.
4. safety-type chemical industry inflammable thing loading-unloading vehicle electrostatic grounding warning interlocked control device according to claim 2, it is characterized in that: described first signal output module comprises resistance R 1 ~ R6, triode VT1, loud speaker LS1 and integrated operational amplifier U1, the anodal end of parallel resistance R1 ~ R2 simultaneously of power supply 5V and the positive pole of loud speaker LS1, the other end of resistance R 1 ~ R2 is parallel to inverting input and the normal phase input end of integrated operational amplifier U1 respectively, be parallel with resistance R 3 between the inverting input of integrated operational amplifier U1 and the output, the output of integrated operational amplifier U1 is the end of parallel resistance R5 simultaneously, the end of the other end while parallel resistance R6 of resistance R 5 and the base stage of triode VT1, the other end ground connection of the collector electrode of triode VT1 and resistance R 6, the emitter of triode VT1 links to each other with the negative pole of loud speaker LS1; The normal phase input end of integrated operational amplifier U1 is the end of parallel resistance R4 simultaneously, the other end series wiring terminal of resistance R 4 1. ~ 2. and binding post 3. ~ 4. after ground connection; Lead to signal output terminal E1 between the emitter of the negative pole of loud speaker LS1 and triode VT1 simultaneously.
5. safety-type chemical industry inflammable thing loading-unloading vehicle electrostatic grounding warning interlocked control device according to claim 3, it is characterized in that: described secondary signal output module comprises resistance R 7 ~ R13, triode VT2 and integrated operational amplifier U2, the anodal end of parallel resistance R7, resistance R 8 and resistance R 13 simultaneously of power supply 5V, the other end of resistance R 7, resistance R 8 is parallel to inverting input and the normal phase input end of integrated operational amplifier U2 respectively, and the other end of resistance R 13 links to each other with the emitter of triode VT2; Be parallel with resistance R 9 between the inverting input of integrated operational amplifier U2 and the output, the output of integrated operational amplifier U2 is the end of parallel resistance R11 simultaneously, the end of the other end while parallel resistance R12 of resistance R 11 and the base stage of triode VT2, the other end ground connection of the collector electrode of triode VT2 and resistance R 12; The normal phase input end of integrated operational amplifier U2 is the end of parallel resistance R10 simultaneously, the other end series wiring terminal of resistance R 10 5. ~ 6. after ground connection; Lead to signal output terminal E2 between the emitter of resistance R 13 and triode VT2.
6. safety-type chemical industry inflammable thing loading-unloading vehicle electrostatic grounding warning interlocked control device according to claim 2 is characterized in that: what described first relay module adopted is low level trigger relay module.
7. safety-type chemical industry inflammable thing loading-unloading vehicle electrostatic grounding warning interlocked control device according to claim 3 is characterized in that: what described second relay module adopted is low level trigger relay module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320080269 CN203166471U (en) | 2013-02-21 | 2013-02-21 | Safety type electrostatic grounding alarm interlocking controller of chemical inflammable product handling vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320080269 CN203166471U (en) | 2013-02-21 | 2013-02-21 | Safety type electrostatic grounding alarm interlocking controller of chemical inflammable product handling vehicle |
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| CN203166471U true CN203166471U (en) | 2013-08-28 |
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| CN 201320080269 Expired - Fee Related CN203166471U (en) | 2013-02-21 | 2013-02-21 | Safety type electrostatic grounding alarm interlocking controller of chemical inflammable product handling vehicle |
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