CN205279711U - Vacuum sintering furnace - Google Patents
Vacuum sintering furnace Download PDFInfo
- Publication number
- CN205279711U CN205279711U CN201620040593.9U CN201620040593U CN205279711U CN 205279711 U CN205279711 U CN 205279711U CN 201620040593 U CN201620040593 U CN 201620040593U CN 205279711 U CN205279711 U CN 205279711U
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- controller
- feed circuit
- vacuum
- sintering furnace
- vacuum pump
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Abstract
The utility model provides a vacuum sintering furnace, include: install the vacuum valve between furnace body and vacuum pump, install on the supply circuit of drive vacuum pump work motor, be used for detecting the current monitoring ware that produces triggering signal when the supply circuit electric current is less than the settlement threshold value, be connected with current monitoring ware and vacuum valve respectively for control the controller that vacuum valve closed after supply circuit switches on the setting -up time and when receiving triggering signal. Monitoring the supply circuit electric current like the current monitoring ware and being less than the settlement threshold value, then the decidable motor is in unloaded operating condition, the relation of connection disconnection between motor and the vacuum pump, the unable normal work of vacuum pump, and the current monitoring ware sent feedback signal to the controller this moment, was closed by the vacuum valve of controller control installation between vacuum pump and furnace body, guaranteed that the air can not enter into carbide oxidation or the explosion that causes, the security that improves the vacuum sintering furnace during operation in the furnace body.
Description
Technical field
The utility model relates to hard metal agglomerating plant technical field, in particular to a kind of vacuum sintering furnace.
Background technology
Vacuum sintering furnace is carrying out in sintering cemented carbide production, it is necessary to utilize vacuum pump to extract air in body of heater and produce vacuum environment, and vacuum pump is connected with electric motor by belt, rotates by motor run. In actual production, owing to using the effect of fatigue, periodically load, belt may there is fracture and make vacuum pump cannot normal operation, now air can enter into vacuum sintering furnace interior and cause alloy material oxidation in stove; As there is inflammable gas as protective atmosphere in stove, it is also possible to cause blast, cause personnel to injure and structure deteriorate.
Therefore, how to provide a kind of quick detection vacuum pump whether normally connect with electric motor and then ensure that air can not enter the vacuum pump of vacuum sintering furnace body, it is those skilled in the art's technical problems urgently to be resolved hurrily.
Practical novel content
Causing, for pulley belt fracture between the motor that vacuum pump in solution vacuum sintering furnace and driving vacuum pump rotate, the problem that air enters in body of heater, the utility model provides a kind of new vacuum sintering furnace.
The vacuum sintering furnace that the utility model provides comprises: the vacuum valve being arranged between body of heater and vacuum pump; Be arranged on drive described vacuum pump work electric motor feed circuit on, for detect described feed circuit electric current be less than setting threshold value time produce triggering signal current monitor; It is connected with described current monitor and described vacuum valve respectively, for after described feed circuit conducting setting-up time and at the controller receiving vacuum valve closedown described in described triggering signal control.
Optionally, also comprise and it is controlled by described controller, controls described feed circuit conducting and send to described controller when described feed circuit conducting and trigger the electromagnetic relay of feedback signal that described controller carries out timing.
Optionally, the shielding gas relief valve of connective protection gas storage tanks and described body of heater is also comprised; Described shielding gas relief valve is connected with described controller;
Described controller is used for opening after described feed circuit conducting setting-up time and receiving shielding gas relief valve described in described triggering signal control.
Optionally, also comprise and the warning device that described controller is connected;
Described controller is used for after described feed circuit conducting setting-up time and is receiving warning device warning described in described triggering signal control.
Optionally, described controller also makes described feed circuit open circuit for sending open command after described feed circuit conducting setting-up time and when receiving described triggering signal to described electromagnetic relay.
Optionally, the automatic air-break switch being arranged on described feed circuit is also comprised; Described automatic air-break switch is connected with described controller;
Send break signal to described controller when described automatic trip switch detects described feed circuit overload and disconnects, close so that described controller controls described vacuum valve.
Optionally, described controller is PLC.
Optionally, also comprise and it is arranged on thermo-relay on described feed circuit; Described thermo-relay is connected with described controller;
Overload signal is sent to described controller, so that described controller sends open command to described electromagnetic relay and makes described feed circuit disconnect and make described controller control the cut out of described vacuum valve when described thermo-relay detects that described feed circuit transship.
The vacuum sintering furnace that the utility model provides, arranges the current monitor of size of current on the electric motor feed circuit of monitoring driving vacuum pump work. After feed circuit conducting setting-up time, electric current is substantially stable, and when voltage is substantially stable, size of current can represent the work power of electric motor; Such as current monitor, to monitor electric current less, then can judge that electric motor is in unloaded operation state, connection relation between electric motor and vacuum pump disconnects (being belt fracture in most cases), vacuum pump cannot normal operation, now current monitor sends feedback signal to controller, the vacuum valve being arranged between vacuum pump and body of heater by controller control is closed, ensure vacuum pump can not normal operation time air can not enter into cause in body of heater Wimet oxidation or blast, it is to increase vacuum sintering furnace work time security.
In an embodiment, electromagnetic relay is also set, after controller control electromagnetic relay realizes the conducting of feed circuit, electromagnetic relay sends feedback signal to controller, trigging control device starts to carry out timing, and controller cuts out according to the triggering signal control vacuum valve received after timing setting-up time again.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, it is briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiment of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, it is also possible to obtain other accompanying drawing according to the accompanying drawing provided.
Fig. 1 is vacuum sintering furnace part pilot circuit schematic diagram in the utility model embodiment;
Fig. 2 is vacuum pump and safety-valve schematic diagram in vacuum sintering furnace in the utility model embodiment.
Embodiment
The utility model provides a kind of vacuum sintering furnace; this problem can be detected in time after vacuum pump with the belt fracture of driving suction motor; and then take corresponding sfgd., prevent the hard metal oxidation of heating in vacuum sintering furnace, it is to increase the security in production.
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that described embodiment is only the utility model part embodiment, instead of whole embodiments. Based on the embodiment in the utility model, those of ordinary skill in the art are not making other embodiments all obtained under creative work prerequisite, all belong to the scope of the utility model protection.
The vacuum sintering furnace that the utility model provides comprises body of heater, vacuum pump, the vacuum valve that is arranged between body of heater and vacuum pump. In vacuum sintering furnace production process, vacuum break valve and make vacuum pump and body of heater conducting, vacuum pump evacuation ensures the vacuum tightness in body of heater, Wimet is heated by vacuum sintering furnace under vacuum. Vacuum pump by electric motor through belt transmission dragging work.
If Fig. 1, Fig. 1 are vacuum sintering furnace part pilot circuit schematic diagram in the utility model embodiment, Fig. 2 is vacuum pump and safety-valve schematic diagram in vacuum sintering furnace in the utility model embodiment. As can be seen from Figure 1, the utility model also has current monitor. Current monitor is arranged on the current supply circuit of the electric motor 1 driving vacuum pump work, for the electric current in the feed circuit responding to conducting, produce mutual inductance electric current and by the size of mutual inductance electric current with setting threshold ratio relatively, and then the working order of electric motor when judging that feed circuit are energized: if mutual inductance electric current is less than setting threshold value, then can judge that the electric current in feed circuit is less, electric motor is in no cargo conditions, corresponding belt 3 between electric motor and vacuum pump 2 may rupture, also being exactly vacuum pump stall, now current monitor sends triggering signal; If mutual inductance electric current is more than or equal to setting threshold value, then can judging that feed circuit electric current is relatively big, electric motor is had certain load, is normally connected by belt 3 between electric motor 1 and vacuum pump 2 accordingly, and vacuum pump 2 can normal operation.
In addition, the utility model also has the controller (not shown) being connected with current monitor and vacuum valve 4; Controller can receive the triggering signal that current monitor sends, after feed circuit conducting setting-up time, as received triggering signal, controller connects proves that vacuum pump 2 does not have normal operation, control vacuum valve 4 is closed and vacuum pump 2 and body of heater are disconnected so that body of heater is closed and prevented air from entering in body of heater. Due to the response delay of the parts such as electric motor 1, current transformer and current monitor, after feed circuit conducting, current monitor can not monitor size of current in feed circuit at once, as triggering signal is closed vacuum valve 4 as judgement signal by controller immediately, then whole vacuum sintering furnace cannot normal operation; It is thus desirable to the time lag characteristic according to each parts arranges corresponding setting-up time, after each parts normal operation, triggering signal according to monitoring judges vacuum pump whether normal operation again.
For realizing the Automated condtrol that electric motor is powered, the utility model embodiment also can arrange electromagnetic relay; Electromagnetic relay is connected with controller, and the corresponding feedback signal of opening and closing send automatically controlling feed circuit under the control of the controller is to controller, and trigging control device starts to carry out timing normally to monitor feed circuit size after setting-up time. Concrete, electromagnetic relay comprises the normally opened contact KM being arranged on feed circuit and the feedback contact (not shown) arranged side by side with normally opened contact; It is electric that controller makes the solenoid of electromagnetic relay obtain after sending steering order, normally opened contact KM is closed and makes feed circuit conducting, now also closed send feedback signal is to controller for feedback contact, and trigging control device carries out timing and starts to setting-up time according to the triggering signal control vacuum valve cut out received.
For improving the protection to Wimet in body of heater further, also can arranging corresponding shielding gas storage tank and shielding gas relief valve in the utility model one embodiment, shielding gas relief valve is arranged between shielding gas storage tank and body of heater; Shielding gas relief valve and controller connect; after feed circuit conducting setting-up time and controller receive triggering signal; controller transmission command adapted thereto Control protection air release valve is opened and is filled shielding gas in body of heater, prevents air and Wimet from reacting. In embody rule, shielding gas relief valve can be opened after vacuum valve is closed, it is possible to open what vacuum valve was closed simultaneously.
In addition, in the utility model embody rule, the warning device being connected with controller also can be set. After feed circuit conducting setting-up time and when controller receives triggering signal, controller can control warning device and report to the police and remind operator to check and prevent mishap by relevant device whether normal operation or carry out safety precaution.
In actual production, for carrying out safety inspection, maintenance of equipment, electric motor 1 should be made to shut down inspection as early as possible after monitoring electric motor 1 zero load. For this reason, also sending open command to electromagnetic relay after feed circuit conducting setting-up time and controller receive triggering signal, closed normally opened contact KM disconnects to make to be arranged in feed circuit in electromagnetic relay, and then can make electric motor stall as early as possible.
Except may there is above unloaded problem, when vacuum sintering furnace works, electric motor 1 also may transship, and this also badly influences the security of production. For preventing long-term overload, in the utility model embodiment, also overload preventing device can be set at feed circuit, when electric current is greater than rated current in feed circuit, make feed circuit automatically disconnect.
Concrete, overload preventing device can be the automatic air-break switch QM on feed circuit, and the feedback contact of automatic air-break switch QM is connected with controller. In normal production, in automatic air-break switch QM, normally closed contact is in closed state (closing by artificial promotion); As, when in feed circuit, electric current is excessive, the thermoelectric converter in automatic air-break switch QM makes normally closed contact disconnect because of heat effect distortion, and corresponding feed circuit open circuit, feedback contact send break signal to controller; Controller controls vacuum valve and cuts out after receiving break signal, ensure that vacuum pump is shut down rear air and can not be entered in body of heater. As previously mentioned, controller also can accordingly Control protection air release valve open release shielding gas, control warning device send guard signal.
Aforementioned automatic air-break switch QM is directly disconnected by the normally closed contact control feed circuit of self, practical application also can be replaced by thermo-relay, utilize thermo-relay to controller generation overload signal, disconnect by closed normally opened contact KM in controller control electromagnetic relay. Concrete thermo-relay comprises thermoelectric converter and dynamic circuit breaker contact, and dynamic circuit breaker contact is connected with controller; When thermoelectric converter deforms because of heat effect, dynamic circuit breaker contact disconnects and sends break signal to controller, and controller sends clearance order to electromagnetic relay after receiving break signal, controls feed circuit open circuit by electromagnetic relay; Controller also controls the previous security measures such as vacuum valve cut out simultaneously.
In the utility model embody rule, controller can adopt PLC, utilizes PLC automatically to control the normal production of each parts collaborative work, monitoring and guarantee vacuum sintering furnace as lower computer; Simultaneously PLC also can with upper computer communication, receive the steering order that upper computer sends and the working order feeding back each parts. Certainly, in other embody rule, it is possible to adopt the control terminals such as such as industry computer directly as controller.
It is another it is noted that in actual installation, current monitor comprises the current transformer being sleeved in feed circuit and is connected the monitor producing triggering signal according to current transformer monitoring current signal with current transformer. As can be seen from Figure, owing to electric motor adopts three-phase alternating current to power, therefore current transformer is arranged on and wherein just can realize the monitoring to size of current in road feed circuit.
Above the vacuum sintering furnace of the utility model specific embodiment is explained, professional and technical personnel in the field can be enable to realize or use the utility model. For those skilled in the art, will being apparent to the multiple amendment of these embodiments, General Principle as defined herein when not departing from spirit or scope of the present utility model, can realize in other embodiments. Therefore, the utility model can not be limited in these embodiments shown in this article, but be met the widest scope consistent with principle disclosed herein and features of novelty.
Claims (8)
1. a vacuum sintering furnace, it is characterised in that, comprising:
The vacuum valve being arranged between body of heater and vacuum pump;
Be arranged on drive described vacuum pump work electric motor feed circuit on, for detect described feed circuit electric current be less than setting threshold value time produce triggering signal current monitor;
It is connected with described current monitor and described vacuum valve respectively, for after described feed circuit conducting setting-up time and at the controller receiving vacuum valve closedown described in described triggering signal control.
2. vacuum sintering furnace according to claim 1, it is characterised in that: also comprise and it is controlled by described controller, control described feed circuit conducting and send the electromagnetic relay triggering described controller and carrying out the feedback signal of timing when described feed circuit conducting to described controller.
3. vacuum sintering furnace according to claim 2, it is characterised in that: the shielding gas relief valve also comprising connective protection gas storage tanks and described body of heater; Described shielding gas relief valve is connected with described controller;
Described controller is used for opening after described feed circuit conducting setting-up time and receiving shielding gas relief valve described in described triggering signal control.
4. vacuum sintering furnace according to claim 3, it is characterised in that: also comprise and the warning device that described controller is connected;
Described controller is used for after described feed circuit conducting setting-up time and is receiving warning device warning described in described triggering signal control.
5. vacuum sintering furnace according to claim 2, it is characterised in that: described controller is used for sending open command after described feed circuit conducting setting-up time and when receiving described triggering signal makes described feed circuit open circuit to described electromagnetic relay.
6. vacuum sintering furnace according to the arbitrary item of claim 1-5, it is characterised in that: also comprise the automatic air-break switch being arranged on described feed circuit; Described automatic air-break switch is connected with described controller;
Send break signal when described automatic trip switch detects that described feed circuit pass by load and disconnect to described controller, close so that described controller controls described vacuum valve.
7. vacuum sintering furnace according to claim 6, it is characterised in that: described controller is PLC.
8. vacuum sintering furnace according to the arbitrary item of claim 2-5, it is characterised in that: also comprise and it is arranged on thermo-relay on described feed circuit; Described thermo-relay is connected with described controller;
Overload signal is sent to described controller, so that described controller sends open command to described electromagnetic relay and makes described feed circuit disconnect and make described controller control the cut out of described vacuum valve when described thermo-relay detects that described feed circuit transship.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620040593.9U CN205279711U (en) | 2016-01-15 | 2016-01-15 | Vacuum sintering furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620040593.9U CN205279711U (en) | 2016-01-15 | 2016-01-15 | Vacuum sintering furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205279711U true CN205279711U (en) | 2016-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620040593.9U Active CN205279711U (en) | 2016-01-15 | 2016-01-15 | Vacuum sintering furnace |
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| CN (1) | CN205279711U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106979684A (en) * | 2016-01-15 | 2017-07-25 | 湖南天源工业设备有限公司 | A kind of vacuum sintering furnace |
-
2016
- 2016-01-15 CN CN201620040593.9U patent/CN205279711U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106979684A (en) * | 2016-01-15 | 2017-07-25 | 湖南天源工业设备有限公司 | A kind of vacuum sintering furnace |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |