CN218111575U

CN218111575U - Hot runner equipment capable of automatically controlling injection molding flow

Info

Publication number: CN218111575U
Application number: CN202221892360.3U
Authority: CN
Inventors: 钟文昆; 王文英
Original assignee: Shanghai Morui Electromechanical Equipment Co ltd
Current assignee: Shanghai Morui Electromechanical Equipment Co ltd
Priority date: 2022-07-20
Filing date: 2022-07-20
Publication date: 2022-12-23
Anticipated expiration: 2032-07-20

Abstract

A hot runner device capable of automatically controlling injection molding flow comprises a plurality of hot runner bodies, a stabilized voltage power supply and a pressure switch; the pressure detection circuit, the control circuit and the indicating circuit are also arranged; the breather pipe is installed to the upper end one side of inlet pipe, and pressure switch's intake pipe links together with the breather pipe, and pressure detection circuit, control circuit and indicating circuit install in the electric cabinet and electric connection. This novel can conveniently set for through every hot runner entering corresponding mould in the molten fluid raw material volume, in the time of the actual work, only behind last process output hot melt fluid raw materials, relevant circuit just can get the electrician and do, for accurate control feeding volume is prepared, after the raw materials reaches the set volume in corresponding hot runner body injection mould, control circuit can in time close the power of electricity drive mechanism and the hot mechanism of motor, and through the luminous suggestion staff of the emitting diode of the corresponding indicating circuit of the same kind, thus, not only brought the facility for the staff, and effectively reached energy-conserving purpose.

Description

Hot runner equipment capable of automatically controlling injection molding flow

Technical Field

The utility model relates to a corollary equipment technical field, especially a can automatic control mould plastics hot runner equipment of flow.

Background

In the injection molding industry, a hot runner generally refers to a pipeline between heating and melting equipment (such as a screw extruder) and a casting mold, and plastic raw material fluid output by the heating and melting equipment in the previous process is ensured to be kept in a molten state before entering the mold through a mold plastic raw material inlet (pouring gate) by a method of heating (the outer side of the hot runner is divided into two layers, a hollow annular electric heating mechanism is arranged between the two layers, and the electric heating mechanism keeps the temperature of more than 200 degrees), so that the fluid raw material entering the mold is uniformly dispersed, and powerful technical support is provided for ensuring the quality of a cast plastic product.

Generally, a plurality of hot runners are arranged in a shell, a discharge port is arranged at the lower end outside the shell, the upper ends of a plurality of hot material channels are connected with a feed pipe outside the upper end of the shell in parallel through a communicating pipe (an electric heating mechanism is arranged between an outer layer and an inner layer of the outer side), the upper end of the feed pipe is connected with a discharge pipe of heating and melting equipment together, the lower ends of nozzles of the plurality of hot runners are movably connected with upper end raw material inlets of a plurality of molds, a valve rod driven by an electric driving mechanism (such as an electric driving mechanism based on an electromagnet) is vertically arranged in each hot runner (the electric driving mechanism is arranged outside the upper end of the shell, the upper end of the valve rod is welded with a lower end movable rod of the electric driving mechanism, the valve rod enters the hot runner through the upper end of the hot runner), and during work, a worker controls the electric driving mechanism to drive the valve rod to move downwards through a power switch to close the lower ends of the nozzles of the hot runners and close fluid raw materials entering the molds (the upper ends of the nozzles are arranged at the lower ends of the hot runners and the lower middle parts of the hot runners are provided with a fluid hole), or opens the lower ends of the nozzles of the hot runners to control fluid to enter the molds. The existing hot runner is a working mode of manually controlling a fluid electric driving mechanism, so that the fluid possibly enters a relevant die, and after the injection molding amount in the die is enough, the electric driving mechanism and an electric heating mechanism between an inner layer and an outer layer at the outer side of the hot runner are still in an electric working state, generally, the power of the electric driving mechanism is about 20W, the power of the electric heating mechanism is over 1KW, and after the injection molding amount of the relevant die is enough, the electric driving mechanism and the electric heating mechanism are still in the electric working state, thereby increasing unnecessary energy consumption undoubtedly, causing the increase of the whole production cost, and being not beneficial to energy conservation and emission reduction. In summary, it is desirable to provide a hot runner apparatus capable of conveniently presetting a fluid flow rate and timely turning off power supplies of an electric driving mechanism and an electric heating mechanism after the fluid injection amount in a mold is enough.

SUMMERY OF THE UTILITY MODEL

In order to overcome current hot runner because of the structure limit exists as the background drawback, the utility model provides a based on the hot runner body, under relevant mechanism and circuit combined action in using, technical staff can be according to the material consumption of corresponding mould, through the resistance of adjusting adjustable resistance, conveniently set for the molten fluid raw material volume in every hot runner gets into corresponding mould, and pour into the mould in the raw materials reach behind the set amount, can in time close the power of electricity drive mechanism and motor heat mechanism, and the suggestion staff, not only brought the facility for the staff from this, and effectively reached energy-conserving mesh a can automatic control the hot runner equipment of flow of moulding plastics.

The utility model provides a technical scheme that its technical problem adopted is:

a hot runner device capable of automatically controlling injection molding flow comprises a plurality of hot runner bodies, a stabilized voltage power supply and a pressure switch; it is characterized by also comprising a pressure detection circuit, a control circuit and an indication circuit; the control circuit and the indicating circuit are respectively provided with a plurality of paths, and each hot runner body is matched with one path of control circuit and the indicating circuit; a vent pipe is arranged on one side of the upper end of the hot runner body feeding pipe, an air inlet pipe of a pressure switch is connected with the vent pipe, and a pressure detection circuit, a control circuit and an indication circuit are arranged in an electric cabinet; the power supply output end of the voltage-stabilized power supply is electrically connected with the power supply input ends of the multi-path control circuit and the indicating circuit, and the two power supply output ends of each path of control circuit are respectively electrically connected with the power supply input ends of the electric driving mechanism and the electric heating mechanism of each hot runner body; and the signal input end of each path of indicating circuit is electrically connected with the signal output end of each path of control circuit.

Further, the pressure detection circuit comprises a resistor, an NPN triode and a relay which are electrically connected, and the pressure detection circuit is electrically connected with the pressure switch, one end of the pressure switch is connected with the input end of the positive power supply of the relay and the input end of the control power supply, the other end of the pressure switch is connected with one end of the resistor, the other end of the resistor is connected with the base electrode of the NPN triode, and the collector electrode of the NPN triode is connected with the input end of the negative power supply of the relay.

Furthermore, each control circuit comprises an adjustable resistor, an NPN triode, a capacitor, a resistor and a relay which are electrically connected, wherein a collector of the NPN triode is connected with a negative power input end of the first relay, one end of the adjustable resistor is connected with one end of the resistor and a positive electrode of the capacitor, the other end of the resistor is connected with a base of the NPN triode, an emitting electrode of the NPN triode is connected with a negative electrode of the capacitor, the other end of the adjustable resistor is connected with a positive power input end of the first relay and a control power input end, a normally closed contact end of the first relay is connected with positive power input ends of the second relay and the third relay, and a negative electrode of the capacitor is connected with the emitting electrode of the NPN triode, the emitting electrode of the second relay and the negative power input end of the third relay.

Furthermore, each path of indicating circuit comprises a resistor and a light emitting diode which are electrically connected, and the anode of the light emitting diode is connected with one end of the resistor.

The utility model discloses beneficial effect is: this is novel based on the hot runner body, under relevant mechanism and circuit combined action in the application, the technical staff is according to the material quantity of using of corresponding mould, through the resistance of good regulation adjustable resistance, can conveniently set for through every hot runner entering corresponding mould in the molten fluid raw material volume, in the time of the actual work, only after last process output hot melt fluid raw materials, relevant circuit just can get electrician's work, for accurate control feeding volume ready, when the raw materials reaches the set volume after in corresponding hot runner body injection mould, control circuit can in time close the power of electricity drive mechanism and the hot mechanism of motor, and through the corresponding emitting diode luminescence suggestion staff of indicating circuit all the way, thus, not only brought the facility for the staff, and effectively reached energy-conserving purpose. Based on the above, so this novel application prospect that has.

Drawings

The present invention will be further explained with reference to the drawings and examples.

FIG. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a circuit diagram of the present invention.

Detailed Description

As shown in fig. 1 and 2, a hot runner device capable of automatically controlling injection flow comprises a plurality of hot runner bodies 1, a regulated power supply A1 and a pressure switch T, wherein the upper ends of the plurality of hot runner bodies 1 are installed in a casing 2, the lower ends of the hot runner bodies 1 are located at the lower end outside the casing 2, the upper ends of the plurality of hot runner bodies 1 (the electric heating mechanism is installed between the outer layer and the inner layer) are connected in parallel with the lower end of a feeding pipe 4 outside the upper end of the casing 2 through a communicating pipe 3 (the electric heating mechanism is installed between the outer layer and the inner layer, the upper end of the feeding pipe 4 is connected with a discharging pipe of a heating and melting device, a valve rod 5 driven by an electric driving mechanism DCN (in the embodiment, the electric driving mechanism DCN based on an electromagnet is vertically installed in each hot runner body 1 (the electric driving mechanism DCN is located outside the upper end of the casing, the upper end of the valve rod 5 is welded with a movable rod at the lower end of an electric driving mechanism DCN, the valve rod enters the hot runner body 1 through the upper end of the hot runner body 1), when a worker controls the electric driving mechanism to drive the valve rod 5 to move downwards through a power switch, the lower end of the hot runner nozzle 6 is closed, a fluid raw material entering a mold (not shown in figure 1) is closed (the upper end of the nozzle is installed at the lower end of the hot runner and the lower middle part of the nozzle is provided with a fluid hole), or the lower end of the hot runner body nozzle 6 is opened to control the fluid to enter the mold (the solidified raw material remained in the hot runner body 1 and the like is melted by next application of an electric heating mechanism RLN, so that the next time of normal injection molding in the mold is ensured; the pressure detection circuit 7, the control circuit 8 and the indicating circuit 9 are also arranged; the control circuit 8 and the indicating circuit 9 are respectively provided with a plurality of paths, and each hot runner body is matched with the control circuit 8 and the indicating circuit 9; the right side of the upper end of the feeding pipe is welded with a ┙ type vent pipe 10 communicated with the inside of the feeding pipe (fluid can flow downwards after entering the hot runner body 1 and being shut down, and can not block the vent pipe), the air inlet pipe of the pressure switch T is connected with the upper end of the vent pipe 10 through a pipeline joint, and the pressure detection circuit 7, the control circuit 8 and the indication circuit 9 are installed on a circuit board in the electric cabinet 11.

As shown in fig. 1 and 2, the electric heating mechanism RLN of each hot runner body is a PTC constant-temperature hollow annular ceramic electric heating plate with 220V working voltage and the heating temperature of the plate is 260 ℃; the electric drive mechanism DCN of each hot runner body is 20W in power. The stabilized voltage supply A1 is a finished product of a 220V/12V/1KW switch power supply module converting alternating current 220V into direct current 12V. The pressure detection circuit comprises a resistor R1, an NPN triode Q1 and a relay K1 which are connected through circuit board wiring, and is connected with a pressure switch T through a lead, one end of the pressure switch T is connected with the positive power input end of the relay K1 and the control power input end, the other end of the pressure switch T is connected with one end of the resistor R1, the other end of the resistor R1 is connected with the base electrode of the NPN triode Q1, and the collector electrode of the NPN triode Q1 is connected with the negative power input end of the relay K1. Each control circuit comprises an adjustable resistor RPN and an NPN triode QN which are connected through circuit board wiring, a capacitor CN, a resistor R2N, relays KN and K2N, K N, an NPN triode QN collector is connected with a first relay KN negative power input end, one end of the adjustable resistor RPN is connected with one end of the resistor R2N and a positive electrode of the capacitor CN, the other end of the resistor R2N is connected with a base electrode of the NPN triode QN, the other end of the adjustable resistor RPN is connected with a first relay KN positive power input end and a control power input end, a first relay KN normally closed contact end is connected with a second relay K2N and a third relay K3N positive power input end, and a capacitor CN negative electrode is connected with an NPN triode QN emitter, a second relay K2N and a negative power input end of a third relay K3N. Each path of indicating circuit comprises a resistor R3N and a light emitting diode VLN which are connected through circuit board wiring, the anode of the light emitting diode VLN is connected with one end of the resistor R3N, the light emitting surfaces of the light emitting diodes VLN of the multi-path indicating circuit and the adjustable resistor RPN handle of the multi-path control circuit are respectively positioned outside a plurality of openings at the front end of the electric cabinet, and continuous time numbers are marked at the side ends of the adjustable handles of the plurality of adjustable resistors RPN. The power input end 1 and the pin 2 of a regulated power supply A1, the relay K3N control power input end of a control circuit and two poles of an alternating current 220V power supply are respectively connected through leads, the power output end 3 and the pin 4 of the regulated power supply A1, the positive power input end of the relay K1 and the emitting electrode of an NPN triode Q1 of the power input end of a pressure detection circuit are respectively connected through leads, the normally open contact end of the relay K1 and the emitting electrode of the NPN triode Q1 of the power output end of the pressure detection circuit, the other end of an adjustable resistor RPN and the emitting electrode of an NPN triode QN of the power input end of a multipath control circuit and the other end of a resistor R3N of the power input end of an indicating circuit are respectively connected through leads, and the normally open contact ends of the relays K2N and the emitting electrodes of the NPN trion, the normally open contact ends of the relays K3N and the power input ends of an electric driving mechanism DCN and an electric heating mechanism RLN of each hot runner body are respectively connected through leads; the cathode of the light emitting diode VLN at the signal input end of each path of indicating circuit is connected with the collector of the NPN triode QN at the signal output end of each path of control circuit through a lead.

As shown in fig. 1 and 2, in the present invention, based on a hot runner body, a using method of the novel hot runner body 1 is completely consistent with that of an existing hot runner, when in use, fluid raw materials flowing out of a heating and melting device (such as a screw extruder) enter a plurality of hot runner bodies 1 through a feeding pipe 4 and a communicating pipe 3, and then enter a plurality of casting molds through nozzles at the lower ends of the plurality of hot runner bodies 1, the plurality of hot runner bodies 1 and the communicating pipe 3 ensure that raw material fluids output by the heating and melting device in the previous process enter the molds through a mold plastic raw material inlet (sprue) and keep a molten state before entering the molds through an electric heating method (one hot runner body corresponds to one gate in total and can also correspond to one gate among a plurality of gates of one mold), in this embodiment, one hot runner body is preferably used corresponding to one gate in total of one mold), so that the fluid raw materials entering the molds are uniformly dispersed, thereby playing a powerful technical support for ensuring the quality of the cast plastic products; in practical situations, if the electric driving mechanism DCN controls the valve rod 5 to move downwards, the lower end in the hot runner body 1 is closed and the fluid raw material entering the mold is closed, and if the electric driving mechanism DCN controls the valve rod 5 to move upwards, the lower end in the hot runner body 1 is no longer closed, and the fluid raw material enters the mold through the nozzle. After the main power switch is turned on and the 220V power enters the power input end of the stabilized voltage power supply A1, the

pins

3 and 4 of the stabilized voltage power supply A1 can output stable direct current 12V power to enter the pressure detection circuit, and then the pressure detection circuit is in a power-on working state. After the pressure detection circuit works by electrifying, if the heating melting equipment (screw extruder) of the previous procedure does not output raw materials, the pressure in the feeding pipe 4 is lower, so that the internal contact of the pressure switch T is opened, the relay K1 cannot be electrified and attracted, and the corresponding control circuit and the indicating circuit cannot work by electrifying. In practical situations, if the heating and melting device (screw extruder) in the previous process outputs raw materials, the pressure of the fluid raw materials output by the screw extruder is high, so that the internal contact of the pressure switch T is closed, further, the positive pole of the 12V power supply is subjected to voltage reduction and current limitation by the resistor R1 and enters the base of the NPN triode Q1, the conducting and collecting electrode of the NPN triode Q1 outputs low level and enters the negative power supply input end of the relay K1, the relay K1 is electrified to attract the control power supply input end and the normally open contact end of the relay K1 to be closed, and the corresponding control circuit and the indicating circuit are in an electrified working state. Through above-mentioned mechanism and circuit combined action, this is novel when one process output raw materials, control circuit and the indicating circuit of back level just can get electric work, do all can ready in getting into a plurality of moulds for accurate control hot melt raw materials through many hot runner bodies 1 (if control circuit and indicating circuit do not have output fluid raw materials at heating melting equipment, or just get electric work after a period after the output raw materials, can cause control circuit and indicating circuit signal input to advance or delay, so also can not reach good accurate timing control feed volume effect). This novel every hot runner body is furnished with a switch SN respectively, and switch SN (operating handle is located outside the electric cabinet front end trompil) two wiring ends are connected with relay KN normally closed contact end and K2N, K N's anodal power input end respectively, like this, when this hot runner body 1 need not provide the raw materials for the mould, can close switch in advance, and follow-up this electric heating mechanism and the electricity that hot runner body located drive the mechanism just can not get electric work.

As shown in fig. 1 and 2, before operation, a technician adjusts the resistance value of the adjustable resistor RPN corresponding to one of the control circuits according to multiple accumulated experiences and the time of the injection amount required by multiple molds respectively (in combination with digital adjustment of the handle side time of the adjustable resistor RPN), so as to set the time for the hot runner body to output the molten raw material (in actual conditions, the output time can be adjusted to be slightly longer, for example, the injection of the raw material into the corresponding mold can be completed within 2 minutes, so the time is set to be zero for 10 seconds within 2 minutes, and it is ensured that the raw material can be effectively injected into the mold). In each control circuit and the prompting circuit, after the control circuit works by being electrified, the 12V power supply can be subjected to voltage reduction and current limitation by the adjustable resistor RPN to charge the capacitor CN, when the capacitor CN is not fully charged in a period of time at the beginning, the voltage of the base voltage of the 12V power supply entering the NPN triode QN by the adjustable resistor RPN and the resistor R2N in a voltage reduction and current limitation manner is lower than 0.7V, and the NPN triode QN is in a cut-off state, so that the input end of the control power supply and the normally closed contact end of the relay KN cannot be electrified, and further the relay K2N, K N can be electrified to attract the input end of the control power supply and the normally open contact end thereof to be closed, so that the electric driving mechanism DCN and the electric heating mechanism RLN corresponding to one hot runner body 1 can be in a normal electrified state, and the molten raw material output by the heating and melting equipment of the previous process enters a corresponding die gate through the hot runner body 1. After charging for a period of time (for example, 2 minutes), when the capacitor CN is fully charged (that is, when the time set by a technician through the adjustable resistor RPN is reached, the time is equal to 1.1 times the resistance value of the adjustable resistor RPN and the capacity of the capacitor CN), the 12V power source enters the NPN triode QN through the adjustable resistor RPN and the resistor R2N, the base voltage of the NPN triode QN is higher than 0.7v, the NPN triode QN is in a conducting state, the collector of the NPN triode QN outputs a low level to enter the negative power input end of the relay KN, then the relay KN is powered on, the control power input end and the normally closed contact end are opened, further the relay K2N, K N is powered off and is not pulled on, and thus the electric driving mechanism DCN and the electric heating mechanism RLN corresponding to the hot runner body 1 are powered off and do not work any more, the corresponding nozzles are closed, and the raw materials do not enter the corresponding molds. In the prompting circuit, when the timing time is up, the low level output by the collector of the NPN triode QN after the QN is conducted is also subjected to voltage reduction and current limitation by the resistor R3N and enters the power input end of the cathode of the light-emitting diode VLN, so that a corresponding light-emitting diode VLN (the side end of the light-emitting surface is marked with numbers, and each number represents a corresponding hot runner body) can be subjected to electroluminescence to visually prompt a worker as to which power hot runner body 1 stops outputting raw materials, and the matched electric heating mechanism RLN stops working. Through the combined action of the motor and the mechanism, the novel energy-saving device not only brings convenience to workers, but also effectively achieves the purpose of energy conservation. In fig. 2, the resistances R1 and R2N, R N are 100K, 470K and 1.8K, respectively; the model of the NPN triode Q1 and the model of the QN are 9013; relays K1, KN, K2N, K N are DC12V relays; the buzzer B is an active continuous audible alarm finished product with the model SF 12V; the capacitor CN is an electrolytic capacitor with the model number of 1000 muF/25V; the model of the adjustable resistor RPN is 1M; the light emitting diode VLN is a red light emitting diode; the pressure switch is an automatic diaphragm type air pressure adjustable normally open normally closed pressure switch (adjusted to 0.05 MPa) with the model of QPM 11-NO.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, the embodiments do not include only one independent technical solution, and such description is only for clarity, and those skilled in the art should take the description as a whole, and the technical solutions in the embodiments may be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A hot runner device capable of automatically controlling injection molding flow comprises a plurality of hot runner bodies, a stabilized voltage power supply and a pressure switch; it is characterized by also comprising a pressure detection circuit, a control circuit and an indication circuit; the control circuit and the indicating circuit are respectively provided with a plurality of paths, and each hot runner body is matched with one path of control circuit and the indicating circuit; a vent pipe is arranged on one side of the upper end of the hot runner body feeding pipe, an air inlet pipe of a pressure switch is connected with the vent pipe, and a pressure detection circuit, a control circuit and an indication circuit are arranged in an electric cabinet; the power supply output end of the voltage-stabilized power supply is electrically connected with the power supply input ends of the multi-path control circuit and the indicating circuit, and the two power supply output ends of each path of control circuit are respectively electrically connected with the power supply input ends of the electric driving mechanism and the electric heating mechanism of each hot runner body; and the signal input end of each path of indicating circuit is electrically connected with the signal output end of each path of control circuit.

2. The hot runner apparatus capable of automatically controlling injection molding flow according to claim 1, wherein the pressure detection circuit comprises a resistor, an NPN transistor, and a relay electrically connected to the pressure switch, wherein one end of the pressure switch is connected to the positive power input terminal of the relay and the control power input terminal, the other end of the pressure switch is connected to one end of the resistor, the other end of the resistor is connected to the base of the NPN transistor, and the collector of the NPN transistor is connected to the negative power input terminal of the relay.

3. The hot runner apparatus capable of automatically controlling injection molding flow according to claim 1, wherein each control circuit comprises an adjustable resistor and an NPN transistor, a capacitor, a resistor, and a relay, which are electrically connected, wherein a collector of the NPN transistor is connected to a negative power input terminal of the first relay, one end of the adjustable resistor is connected to a positive terminal of the resistor and a base of the NPN transistor, an emitter of the NPN transistor is connected to a negative terminal of the capacitor, the other end of the adjustable resistor is connected to a positive power input terminal of the first relay and a control power input terminal, a normally closed contact terminal of the first relay is connected to positive power input terminals of the second relay and the third relay, and a negative terminal of the capacitor is connected to the emitter of the NPN transistor, the emitter of the second relay and the negative power input terminal of the third relay.

4. The hot-runner apparatus capable of automatically controlling injection molding flow according to claim 1, wherein each indicating circuit comprises a resistor and a light emitting diode electrically connected, and the anode of the light emitting diode is connected to one end of the resistor.