CN217531651U

CN217531651U - Cleaning and monitoring device for hot runner

Info

Publication number: CN217531651U
Application number: CN202221636124.5U
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: 2022-06-27
Filing date: 2022-06-27
Publication date: 2022-10-04
Anticipated expiration: 2032-06-27

Abstract

The cleaning and monitoring device used for the hot runner comprises a voltage-stabilized power supply, an electromagnetic valve, an air compressor, an electromagnetic valve, a control circuit and an alarm circuit; the air compressor comprises a plurality of electromagnetic valves, wherein the upper end of a feeding pipe of a hot runner is provided with an exhaust pipe, the other end of the exhaust pipe is connected with one end of one of the electromagnetic valves, the lower side ends of the hot runners are respectively provided with an air inlet pipe, the other ends of the air inlet pipes are connected with one end of the electromagnetic valves, the other ends of the electromagnetic valves are connected with one end of the other electromagnetic valve in parallel, and the other end of the other electromagnetic valve is connected with an exhaust pipe of the air compressor; the stabilized voltage supply, the control circuit and the alarm circuit are arranged in the element box and are electrically connected. The novel hot runner device can blow the materials remained in the hot runners out of the hot runners and the like, so that the next normal melting of raw materials can be ensured to smoothly enter the die, and the quality of finished products is ensured; in production, when the molten material is blocked due to various reasons, the alarm circuit can give out a loud alarm in time to prompt relevant personnel to dispose.

Description

Cleaning and monitoring device for hot runner

Technical Field

The utility model relates to a corollary equipment technical field, especially a cleaning and monitoring devices that hot runner used moulds plastics.

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 the raw material fluid output by the heating and melting equipment in the previous process is ensured to be in a molten state before entering the mold through a mold plastic raw material inlet (sprue) by a heating method (an electric heating mechanism is arranged on the outer side of the hot runner), so that the raw material of the fluid 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 positioned at the lower end outside the shell, the upper ends of a plurality of hot material channels are connected in parallel with the lower part of a feed pipe outside the upper end of the shell through a communicating pipe, the upper ends of the feed pipes are connected with a discharge pipe of heating and melting equipment, the lower ends of the plurality of hot runners are connected with raw material inlets at the upper ends of a plurality of molds, an electrically-driven or hydraulically-driven valve rod is vertically arranged in each hot runner, and when relevant equipment controls the valve rod to move downwards in work, the lower ends in the hot runners are closed, fluid raw materials entering the molds are closed, or the amount of liquid fluid entering the molds is opened. The existing hot runner heating mode generally adopts a heating rod or a medium-frequency heating coil; the two heating methods have certain disadvantages due to the structure limitation, and are specifically shown as follows. One is as follows: the plastic material is remained more or less in the hot runner after shutdown, the plastic material is not cleaned, and the raw material is condensed in the hot runner at the last time and the heat of the initial stage of the hot runner is limited, so that the condensed raw material with probability can block the fluid raw material output by the hot melting equipment or be partially melted and enter the die, and then the subsequent raw material which is not fully dissolved is mixed in the finished product, thereby bringing adverse effect to the product quality. The second step is as follows: the flow of material between the hot melt apparatus and the plastic mold cannot be monitored in real time, which can adversely affect normal production when no fluid material enters the mold via the hot runner for various reasons (e.g., no fluid material is output due to failure of the hot melt apparatus) and is not handled by the worker in a timely manner. In view of the above, it would be desirable to provide an apparatus that cleans the hot runner after shutdown and monitors fluid flow during production.

SUMMERY OF THE UTILITY MODEL

In order to overcome current hot runner because of the structure limit exists as the background the drawback, the utility model provides a under relevant mechanism and circuit combined action, can be automatic after whole equipment shuts down at every turn and reversely blow off the residue of remaining in the hot runner through heating and compressed air mode, guaranteed next time in the normal melting raw materials can get into the mould smoothly to finished product quality has been guaranteed, and in production, the melting material can in time send out when blockking up because of various reasons and sound the cleaning and monitoring devices that the hot runner that the relevant personnel of suggestion dealt with used.

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

the cleaning and monitoring device used for the hot runner comprises a voltage-stabilized power supply, an electromagnetic valve, an air compressor and an electromagnetic valve, and is characterized by also comprising a control circuit and an alarm circuit; the air compressor comprises a plurality of electromagnetic valves, wherein an exhaust pipe is arranged at the upper end of a feeding pipe of a hot runner, the other end of the exhaust pipe is connected with one end of one of the electromagnetic valves, the lower side ends of the hot runners are respectively provided with an air inlet pipe, the other ends of the air inlet pipes are connected with one ends of the electromagnetic valves, the other ends of the electromagnetic valves are connected with one end of the other electromagnetic valve in parallel, and the other end of the other electromagnetic valve is connected with an exhaust pipe of the air compressor; the stabilized voltage supply, the control circuit and the alarm circuit are arranged in the element box; the power supply output end of the control circuit is electrically connected with the power supply input ends of the electric heating mechanisms of the plurality of hot runners, the signal power supply output end of the control circuit is electrically connected with the power supply input ends of the plurality of electromagnetic valves, and the signal input end of the control circuit is electrically connected with the power supply input end of the hot melting equipment.

Further, the valve core inside the magnetic valve is in a normally closed structure.

Further, control circuit includes electric connection's relay, time switch, and two normally open contact ends of first relay and time switch's power input both ends are connected respectively, and two power output ends of time switch and two power input ends of second relay are connected respectively.

Further, the alarm circuit comprises an electrically connected resistor, an adjustable resistor, an NPN triode, a buzzer and a pressure switch, a vent pipe is installed at the upper end of a feeding pipe of the hot runner, the pressure switch is installed on the vent pipe, one end of the pressure switch is connected with the positive power input end of the buzzer, the other end of the pressure switch is connected with one end of a first resistor, the other end of the first resistor is connected with one end of a second resistor and one end of the adjustable resistor, the other end of the adjustable resistor is connected with the base electrode of the NPN triode, the collector electrode of the NPN triode is connected with the negative power input end of the buzzer, and the other end of the second resistor is connected with the emitter electrode of the NPN triode.

The utility model has the advantages that: the novel control circuit can automatically obtain electricity to work after the thermal fusion equipment is shut down, compressed air output by the air compressor is controlled to enter through the lower end of the hot runner and then is discharged from the side part of the upper end of the feeding pipe, and high-pressure air flows into and flows out of the feeding pipe; in production, when the molten material is blocked due to various reasons, the alarm circuit can timely make a loud alarm to prompt relevant personnel to dispose, so that the injection molding product quality is guaranteed and a favorable technical support is provided. 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, the cleaning and monitoring device for hot runners includes a regulated power supply A1, electromagnetic valves DC1, DC2, and DC3, an air compressor (not shown), a control circuit 1, and an alarm circuit 2; the right side of the upper end of a feeding pipe 8 of the hot runner 3 is welded with an exhaust pipe 4 communicated with the feeding pipe, the other end of the exhaust pipe 4 is in threaded connection with one end of one electromagnetic valve DC1, the lower side ends of a plurality of hot runners are respectively welded with one air inlet pipe 5 communicated with the interior of the hot runner, the other ends of the plurality of air inlet pipes 5 are in threaded connection with one ends of a plurality of other electromagnetic valves DC2, the other ends of the plurality of electromagnetic valves DC2 are respectively in parallel connection with a plurality of air inlets of a main air pipe 6, the other end of the main air pipe 6 is in threaded connection with one end of another electromagnetic valve DC3, the other end of the other electromagnetic valve DC3 is connected with the exhaust pipe of an air compressor through a hose, and the air compressor is installed in a workshop; the stabilized voltage supply A1, the control circuit 1 and the alarm circuit 2 are arranged on a circuit board in the element box 7.

As shown in FIGS. 1 and 2, the regulated power supply A is a finished product of a 220V/12V/1KW AC-220V-to-DC power supply module; the internal valve cores of the electromagnetic valves DC1, DC2 and DC3 are in a normally closed structure, the power is 2W, and the working voltage is direct current 12V. Control circuit includes relay K and K1, time switch A1 through circuit board wiring connection, and two normally closed contact ends of first relay K and time switch A2's power input both

ends

1 and 2 feet are electric connection respectively, and two power output end 3 of time switch A1 and 4 feet and two power input end of second relay K1 are connected respectively. The alarm circuit comprises resistors R1 and R2, an adjustable resistor RP1, an NPN triode Q1, a buzzer B and a pressure switch S1 which are connected through circuit board wiring, wherein a '+' -shaped breather pipe 8 communicated with the inside of a feeding pipe is welded on the left side of the upper end of the feeding pipe of a hot runner, and the lower end of the air inlet pipe of the pressure switch S1 is connected with the upper end of the breather pipe 8 through a pipe joint; one end of a pressure switch S1 is connected with the positive power input end of the buzzer B, the other end of the pressure switch S1 is connected with one end of a first resistor R1, the other end of the first resistor R1 is connected with one end of a second resistor R2 and one end of an adjustable resistor RP1, the other end of the adjustable resistor RP1 is connected with the base electrode of an NPN triode Q1, the collector electrode of the NPN triode Q1 is connected with the negative power input end of the buzzer B, and the other end of the second resistor R2 is connected with the emitting electrode of the NPN triode Q1. The power input end 1 and the pin 2 of a stabilized voltage supply A, two control power input ends of a relay K1 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 stabilized voltage supply A, the positive power input end of a buzzer B of the power input end of an alarm circuit and an emitting electrode of an NPN triode Q1, and two control power input ends of the relay K are respectively connected through leads, two normally open contact ends of the relay K1 of the power output end of the control circuit and the power input ends of electric heating mechanisms RT of a plurality of hot runners are respectively connected through leads, the

pins

3 and 4 of a time control switch A1 and the power input ends of electromagnetic valves DC1, DC2 and DC3 of the signal power output end of the control circuit are respectively connected through leads, and the two power input ends of the relay K of the signal input end of the control circuit and the power input ends of a heat fusion device T are respectively connected through leads.

As shown in fig. 1 and 2, after a 220V ac power supply enters a power supply input end of a regulated power supply a,

pins

3 and 4 of the regulated power supply 1 output a stable dc12V power supply to enter a control power supply input end of a relay K and enter a power supply input end of an alarm circuit. In practical situations, when the heat melting device T is not powered off, the two ends of the power input of the relay K are powered on to be in an attraction state, the control power input end and the normally closed contact are opened, the time control switch A1 cannot be powered on to work, the electromagnetic valves DC1, DC2 and DC3 cannot be powered on to work, and thus, plastic fluid output by the heating and melting device (such as a screw extruder) enters a casting mold through a hot runner. When the melting equipment T is shut down, the two ends of the power input of the relay K are electrified and are in a power-off state, the control power input end and the normally closed contact are closed, then the time control switch A1 can be electrified to work, after the time control switch A1 is electrified to work, under the action of the internal circuit of the time control switch A and the power output time of 3 pins and 4 pins set by a technician, the power can be output for a certain time and enters the power input ends of the electromagnetic valves DC1, DC2 and DC3 (and enters the power input end of the relay K1, the relay K1 is electrified to attract the control power input end and the normally open contact end to be closed, and the electric heating mechanism RT is continuously in an electrified heating state), thus, the electromagnetic valve is electrified and the internal valve core is opened, compressed air output by the air compressor enters through the lower ends of the plurality of hot runners 3 and is then discharged from the upper end side part of the feeding pipe 4, high-pressure air flows in and flows out, and because the electric heating mechanism RT is in an electrified and is in a heating state, thus, residual materials in the plurality of the hot runners 3 can be effectively blown out, the next time, the normal melting raw materials can be ensured to smoothly enter the mold, and the quality of the finished product can be ensured (after the air compressor is heated and the discharge port of the automatic melting equipment T and the electric heating electromagnetic valve can not be closed, the molten air can be output and the molten equipment to heat and can be output and can not enter the discharge port of the molten equipment. After the alarm circuit is electrified to work, if the heating and melting equipment normally works and the fluid raw material in the vent pipe 9 enters through the discharge hole of the heating and melting equipment is smooth, the pressure in the vent pipe 9 is relatively small, the internal contact of the pressure switch S1 is opened, and the rear-stage buzzer B cannot sound; if the heating and melting equipment does not work normally and enters the air pipe 9 through the discharge hole of the heating and melting equipment when the fluid raw materials are not smooth, the pressure in the air pipe 9 is relatively large, then the internal contact of the pressure switch S1 is closed, thus, the positive electrode of the 12V power supply is subjected to voltage division through the resistors R1 and R2, the adjustable resistor RP1 is subjected to voltage reduction and current limitation and then enters the base of the NPN triode Q1 (higher than 0.7V), then the NPN triode Q1 is conducted with the collector to output low level and enters the negative power supply input end of the buzzer B, and the buzzer B is electrified to give a loud prompt sound to prompt relevant personnel that the melting materials are blocked due to various reasons (for example, the heating mechanism of the heating and melting equipment is damaged), and the relevant personnel can deal with the materials, so that the beneficial technical support is achieved for ensuring the quality of injection molding products. In fig. 2, the resistances of the resistors R2 and R1 are 10K and 4.7K, respectively; the model of the NPN triode Q1 is 9013; the relay K1 is a DC12V relay; the relay K is an alternating current 220V relay; the buzzer B is an active continuous audible alarm with the model SF 12V; the model of the adjustable resistor RP1 is 470K; the time control switch A1 is a finished product of a full-automatic microcomputer time control switch with the model KG316T, the microcomputer time control switch is provided with a plurality of keys, two

power input ends

1 and 2 pins and two

power output ends

3 and 4 pins, a user respectively presses and operates the plurality of keys, and the interval time of power output by the two power output ends and the time of each power output can be set; the pressure switch S1 is a finished product of an electric contact pressure switch (the inner contact of the pressure switch is normally open and the control air pressure is 0.3 Mpa) with the model number KG-03 DE.

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. The cleaning and monitoring device used for the hot runner comprises a voltage-stabilized power supply, an electromagnetic valve, an air compressor and an electromagnetic valve, and is characterized by also comprising a control circuit and an alarm circuit; the air compressor comprises a plurality of electromagnetic valves, wherein an exhaust pipe is arranged at the upper end of a feeding pipe of a hot runner, the other end of the exhaust pipe is connected with one end of one of the electromagnetic valves, the lower side ends of the hot runners are respectively provided with an air inlet pipe, the other ends of the air inlet pipes are connected with one ends of the electromagnetic valves, the other ends of the electromagnetic valves are connected with one end of the other electromagnetic valve in parallel, and the other end of the other electromagnetic valve is connected with an exhaust pipe of the air compressor; the stabilized voltage power supply, the control circuit and the alarm circuit are arranged in the element box; the power supply output end of the control circuit is electrically connected with the power supply input ends of the electric heating mechanisms of the plurality of hot runners, the signal power supply output end of the control circuit is electrically connected with the power supply input ends of the plurality of electromagnetic valves, and the signal input end of the control circuit is electrically connected with the power supply input end of the hot melting equipment.

2. The cleaning and monitoring device for a hot runner of claim 1, wherein the magnetic valve internal spool is of a normally closed configuration.

3. The cleaning and monitoring device for hot runners according to claim 1, wherein the control circuit comprises relays and a time switch which are electrically connected, two normally open contact terminals of a first relay and two power input terminals of the time switch are respectively connected, and two power output terminals of the time switch and two power input terminals of a second relay are respectively connected.

4. The hot runner cleaning and monitoring device as claimed in claim 1, wherein the alarm circuit comprises a resistor, an adjustable resistor, an NPN transistor, a buzzer and a pressure switch, the resistor, the adjustable resistor, the NPN transistor and the buzzer are electrically connected, the vent pipe is installed at the upper end of the feeding pipe of the hot runner, the pressure switch is installed on the vent pipe, one end of the pressure switch is connected with the positive power input end of the buzzer, the other end of the pressure switch is connected with one end of the first resistor, the other end of the first resistor is connected with one end of the second resistor and one end of the adjustable resistor, the other end of the adjustable resistor is connected with the base of the NPN transistor, the collector of the NPN transistor is connected with the negative power input end of the buzzer, and the other end of the second resistor is connected with the emitter of the NPN transistor.