CN2204584Y - Automatic vacuum furnace for firing artificial tooth - Google Patents

Abstract

The utility model is composed of a mechanical part and a microcomputer control part, wherein, the control part is composed of a microcomputer control system composed of a 80C31 single chip computer, EPROM store software, a keyboard operation part, a digitron display part, a power part and other main parts. All experimental work data of a firing furnace can be printed out by a printer for warehousing and standby. The microcomputer system of the firing furnace can store 200 firing methods which can be invoked at the instruction type at any time; thus, the firing furnace which is advanced tooth setting workingequipment can be used for burning out artificial teeth of distinct types and materials with the rate of finished teeth as high as 100%.

Description

Automatic vacuum furnace for firing artificial tooth

A kind of equipment that is used to fire artificial teeth---fully automatic vacuum artificial teeth firing furnace.

As everyone knows, artificial teeth is because its final products are mounted in people's the oral cavity, so be very strict for the prescription of artificial teeth at aspects such as color and luster, hardness, shapes.And known tooth firing furnace, as the equipment of development and production such as Shanghai medical apparatus and instruments factory, it mainly is manual operation, the control difficulty, and yield rate is low.And the product of external import, except costing an arm and a leg, also because of no test data output device, and the number of entries of experiment is few, is unsuitable for experimentation to use, and all has certain shortcoming.

The purpose of this utility model is invented a kind of fully automatic vacuum artificial teeth firing furnace exactly, it can adapt to multiple different process for calcining and scientific experiments requirement, it can make the artificial teeth yield rate that burns out reach 100%, and can print all data clearly.All processes only need just can be finished according to the machine internal program automatically by start key, have simplified operation sequence greatly.

The technical solution of the utility model is such: whole firing furnace is made of mechanical part and microcomputer control section.Mechanical part is made up of body of heater, actuating device, vacuum system and control casing respectively.Control section serves as main formation with 80C31 one chip microcomputer chip.Except that driving element, all the other are the cmos circuit element in The whole control system, to reduce power consumption, increase capacity of resisting disturbance.The power supply of this equipment except that using the high-performance power-supply filter, has also adopted the circuit each several part mode of power supply separately, does not disturb mutually to keep each several part.The output driving element is to be finished by solid-state relay.Analog quantity adopts the voltage/frequency method to the conversion of digital quantity, to increase the capacity of resisting disturbance of sampling.Firing furnace all working program all is stored in the 27C128 chip, and the program that the user sets all is stored on the DS1225AB battery self-shield memory, and the operator can call working procedure in the memory arbitrarily by keyboard.The printer output interface of firing furnace is the RS-232 type, all printers that this interface is arranged, and no matter which kind of specification all can be used on this interface.Normally used is TP-μ P40 type.Firing furnace uses 2XZ-0.25 type vacuum pump, can satisfy the needs of sintering procedure.

Below in conjunction with illustrating embodiment of the present utility model.

Fig. 1 is a fully automatic vacuum artificial teeth firing furnace shape assumption diagram.

Fig. 2 is the main program block diagram of control section.

Fig. 3 is the host line schematic diagram.

Fig. 4 is keyboard/display part schematic circuit.

Fig. 5 is a complete machine control section power circuit schematic diagram.

Fig. 6 is an A/D conversion line schematic diagram.

Fig. 7 is a transducing signal process circuit schematic diagram.

Fig. 8 is the output circuit schematic diagram.

Fig. 9 is the printer driver circuit schematic diagram.

Figure 10 is the interrupt service routine block diagram.

Wherein: 1, body of heater, 2, guide frame, 3, the control chamber front panel, 4, band synchronously, 5, guide runner, 6, spherical guide, 7, guide housing, 8, vacuum pump, 9, heater, 10, inner lining of furnace, 11, stove top case, 12, furnace shell, 13, burn fluted disc, 14, pallet, 15, bottom door, 16, vacuum line, 17, vacuum valve, 18, control chamber, 19, frame, 20, be with driving motor synchronously.TE is a thermocouple, and PT is the pressure inverting element.

Fully automatic vacuum artificial teeth firing furnace described in the utility model, generally to be a kind of frame for movement of mode, as shown in Figure 1, firing furnace is made up of guide frame 2 and body of heater 1 and control chamber 18.Body of heater is the furnace shell of being made by rustless steel 12 and uses Al ₂O ₃The inner lining of furnace 10 that fibrous material is made, stove top case 11 and stove internal heat generation body 9 are formed.Whole body of heater is connected by the guide runner in connecting piece and the guide frame 5.When guide runner 5 when spherical guide moves up and down, just be with whole body of heater to move up and down.Guide frame 2 is to make of common iron, straight trough is arranged in frame, be fixed with spherical guide 6 on the straight trough, guide runner 5 is installed on the spherical guide 6, and it can be moved up and down, when synchronous translator 20 starts, drive and be with 4 transmissions synchronously, guide runner 5 moves up and down along spherical guide 6, moves up and down thereby drive whole body of heater, has so just formed the bell furnace structure.It below the center of furnace shell 12 fixed tray 14, install above the pallet and burn fluted disc 13, pallet is to be fixed on support and the frame 19 by bottom door 15, during work, the artificial tooth that needs are fired is placed on the burning fluted disc 13, and after rotating by the button operation motor on the control chamber front panel 3, body of heater 1 just moves down along spherical guide 6, to burn fluted disc 13 and pallet 14 covers and go in the stove, just close stove is whole at the drop-bottom 15 of pallet bottom.At this moment just can energized make the heater heating as required, and can start vacuum pump 8 simultaneously, by vacuum valve 17 and vacuum line 16, make and keep corresponding vacuum in the stove, action of everything and degree size, all be original just definite good by the microcomputor program that is stored in user's chip, operator are as long as by the button on the front panel 3, just can finish above-mentioned overall process easily.Because this utility model tooth when work still is fixed, stove moves, and can not change so can guarantee teeth patterning.Because furnace lining 10 is to adopt Al ₂O ₃Fibre, its heat conduction is little, good heat insulation, intensification scope big (2～200 ℃/minute) is so go for multiple test method.By the storage of microcomputer chip, this utility model can be stored 200 kinds of test methods, as long as the button of operation front panel 3 just can call a certain test method arbitrarily, so that the artificial teeth that the more more method of human is burnt till the different qualities material.And these methods all can come out by printer prints when using each time simultaneously, so as to file, research.Vacuum pump and printer all are placed on one side of the present utility model separately, as adnexa, not in Fig. 1 scope.

Mastery routine as shown in Figure 2 is to be finished by circuit such as the 80C31 chip of MCS-51 series shown in Figure 3 and data latches 74HC373 chips, and memory under program EPROM27C128 and memory DS1225AB are used for storing the program of sintering process and the data in the running.The host oscillation frequency is made up of crystal oscillator and the two mica splitting electric capacity of a slice 11.0592MHz, supplies with stable frequency of oscillation of CPU.C shown in Figure 3 ₂₂, C ₂₁, D ₂And R ₅Form the reset key circuit, with the main control system duty.

81C55(IC80 as shown in Figure 4) its interface provides whole charactrons to show and keyboard scanning circuit.Two 74HC138 form three---and eight decoders, play the effect of expansion 81C55 interface function.Be linked into the keyboard dynamic scan by drive circuit, it is when break in service each time, and (flow chart of break in service is seen Figure 10) all retrieved, sees if there is key button and presses, the P of CPU when key button is pressed _1.0Mouth presents low level.Circuit send low level by turn with each key button, and according to P _1.0The level that receives is to determine which key button is in down state.Thereby carry out corresponding program.The output of IC81 shown in Figure 4 all is used for the display lamp that the driven for emitting lights pipe is formed, and has 21, and two other display lamp is by the PC of IC80 ₄, PC ₅Drive.Power supply indicator directly is connected on the power supply.The output of IC80 shown in Figure 4 promotes charactron work by drive circuit.First row in six row's charactrons is used to show the program number of working as shown in the figure; Second, third row respectively is used to show three kinds of given parameters, and is represented by the right side display lamp; The 4th row shows two kinds of given parameters, and the 5th when coming program setting, can show six kinds of contents.During operate as normal, the given temperature of display routine only; The 6th row's charactron shown in Figure 4 shows temperature in the stove.

Power pack as shown in Figure 5, its wave filter is made up of a pair of π type filter circuit.Only gating 50HZ frequency is passed through.Transformator is the O sections core of the termination of output more than one, B ₁, B ₂It is rectifier bridge.Diagram V ₁, V ₂, V ₃, V ₄, V ₅Form voltage-stabilizing system, stable with the supply voltage that guarantees main frame, and be provided with self-protection function.

As Fig. 6 is the change-over circuit that analog quantity arrives digital quantity, adopts voltage/frequency type, is served as by LM331.By external R ₂₅, R ₂₃, R ₄₃, C ₂₇, C, R ₂₆And R ₂₈, make input voltage when 0～4V changes, output frequency changes in 0～30KHZ.By 4N28 and N ₁(3dK7b) switching tube is formed light every circuit, and input signal and host power supply are isolated.IC as shown in Figure 6 ₃(4051) be one eight and select a circuit, native system is shared wherein 4 inputs, it is by the P of CPU _1.6, P _1.7Control wherein one the tunnel with the circuit turn-on of back.IC ₄: A(LM358) be a follower, unattenuated to guarantee signal through 4051 backs, and the voltage/frequency change-over circuit does not influence the stability of previous circuit work.IC ₄: B(LM358) and D ₂Stabilivolt constitutes an amplitude limiter, when input voltage is too high, falls automatically at 4V, to guarantee the safety of voltage/frequency change-over circuit.

In the external signal treatment circuit as shown in Figure 7, wherein OP-O7 is the main thermocouple amplifying circuit that constitutes.The 12V direct current connects the input of thermocouple through accurate stabilivolt 20W234 voltage stabilizing, is used for when thermocouple opens circuit; play the open circuit protection effect, when promptly thermocouple opened circuit, this signal was added to the input of thermocouple; be equivalent to a big voltage signal, make control circuit obtain a thermocouple cut-off signal.The direct current signal of this standard is also exported the two-way direct current signal, and one road 4V is as IC ₄: the normal voltage of B, one road 3.5V enters 4051 as normal voltage, and the V/F circuit is used for main frame and compensates the influence of bringing for other signal processing circuits owing to variation of ambient temperature.μ P616a as shown in Figure 7 is a temperature sensor, its output 10mV/K signal.Its output signal is through IC13(LM358) change and give 4051 chips.The integrated differential pressure pick-up of forming as 1220 and the LM324 of Fig. 7 is the vacuum signal pick off that vacuum pump is used.This signal is according to given sequence valve, and the unlatching of pump stops and this vacuum values is presented on the front panel.LM324 is a slice four high guaily unit circuit, IC15:A(LM324-A) and R ₄₄---R ₄₇, Z ₁(LM385) constitute precision constant current source, as the power supply of 1220 chips.LM324-B, C form differential amplifier circuit, and LM324-D is an output amplifier, and this circuit is the voltage signal of 4V-0V with the conversion of signals of a 105KPa～0.

As Fig. 8 is output circuit, wherein OP ₁, OP ₂Output is used to control motor, OP ₃Be used to control vacuum pump, OP ₄Be used to control heating resistance wire, OP ₅Be used to control vacuum valve.

Printer driver circuit as shown in Figure 9, the CPU dateout is given printer work through the MC1488 chip drives again after the TXO serial port is sent through the driving of 74LS126 buffering.

Claims (3)

1, a kind of fully automatic vacuum artificial teeth firing furnace, include mechanical part and control section, wherein mechanical part includes bell-type body of heater (1), guide frame (2), control chamber (18), guide runner (5), spherical guide (6), vacuum pump (8), heater (9), inner lining of furnace (10), burn fluted disc (13), pallet (14) and vacuum valve (17) etc., feature of the present utility model is: the control section of firing furnace is by the Control System of Microcomputer of forming with the 80C31 single-chip microcomputer, the EPPOM storage software that can store 200 kinds of process for calcining, keyboard operation part and charactron display part and the power supply unit major part of grading is formed, all experimental work data of firing furnace all can be passed through the NC1488 chip drives, connect printer prints and come out with warehousing, standby.

2, fully automatic vacuum artificial teeth firing furnace according to claim 1, it is characterized in that: the mastery routine of control system is finished by the 80C31 chip, memory under program EPRON27C128 and memory DS1225AB are used for storing the program of sintering process and the data in the running, the host oscillation frequency is by a slice 11.0592MHz, form three by two 74HC138---eight decoders, finish dynamic scan retrieval to keyboard, the duty and the operational factor that show firing furnace by six row's charactrons respectively, finish the A/D circuit conversion by the LM331 integrated circuit, the temperature sensor of firing furnace, vacuum signal pick off and thermocouple amplifying circuit etc., finish by IC15:A-D integrated circuit as shown in Figure 7 respectively, firing furnace promotes printer work by MC1488 chip drives interface circuit.

3, fully automatic vacuum artificial teeth firing furnace according to claim 1 is characterized in that: all working program and the function operations of firing furnace all concentrate on the keyboard of control chamber front panel.Working procedure all is solidificated in the EPROM memory, and work just can be finished the overall process that artificial teeth is fired to only needing a people to handle keyboard button, has realized working automation.

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