CN217531715U

CN217531715U - Height-adjustable hot runner device

Info

Publication number: CN217531715U
Application number: CN202221636151.2U
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

A height-adjustable hot runner device comprises a plurality of hot runner bodies, a stabilized voltage supply, an electric push rod, a power switch, a temperature detection circuit, a detection mechanism and a control circuit; the temperature switch matched with the temperature detection circuit is arranged at the outer side end of the shell, the lower end of the electric push rod is arranged at the upper end of the shell, the upper end of the electric push rod is arranged below the rack, the movable pipe is sleeved in the feeding pipe of the hot runner body, the detection mechanism comprises a movable rod and a force-sensitive resistor, the movable rod is arranged at the outer side end of the hot runner body, and the force-sensitive resistor is arranged at the lower end of the movable rod; the temperature detection circuit, the control circuit, the voltage-stabilized power supply and the power switch are arranged in the electric cabinet and are electrically connected. This novel can sound production suggestion staff inspect concrete reason after the casing internal temperature reduces, guaranteed the normal clear of production progress, can conveniently adjust the interval between nozzle lower extreme and the mould runner upper end, guaranteed the quality of follow-up pouring back product. Based on the above, so this novel application prospect that has.

Description

Height-adjustable hot runner device

Technical Field

The utility model relates to a corollary equipment technical field, but especially a height-adjusting's hot runner device moulds plastics.

Background

In the injection molding industry, a hot runner generally refers to a pipeline between a heating and melting device (such as a screw extruder) and a casting mold, and plastic raw material fluid output by the heating and melting device in the previous process is ensured by a method of heating (the outer side of the hot runner is divided into two layers, an annular electric heating mechanism is installed between the two layers, the electric heating mechanism keeps the temperature of about 200 ℃, an annular constant-temperature hollow electric heating plate finished product is generally adopted, the power is about 300W), and the plastic raw material fluid is kept in a melting state before entering the mold through a mold plastic raw material inlet (sprue) (a plurality of sprues can correspond to one mold, or a plurality of sprues can correspond to a plurality of molds), so that the fluid raw material entering the mold is uniformly dispersed, and a powerful technical support is played for ensuring the quality of a poured plastic product.

Under normal conditions, a plurality of hot runners are provided, the upper parts of the plurality of hot runners are respectively arranged at the lower end outside a shell, the upper ends of the plurality of hot runners are connected with a hollow shell in parallel, the lower end of a feed pipe is arranged outside the upper end of the shell and communicated with the shell, the upper ends of the feed pipes are connected with a discharge pipe of heating and melting equipment, the lower ends of nozzles of the plurality of hot runners are arranged at the upper parts of a plurality of mould raw material inlets, a valve rod driven by an electric driving mechanism (generally an electric driving mechanism for driving the valve rod to move by an electric push rod) 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 movable shaft of the electric driving mechanism, the valve rod enters the hot runners through the upper ends of the hot runners), 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 inner ends of the hot runner nozzles and close fluid raw materials entering the moulds (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 and have a fluid hole), or the lower ends of the hot runner nozzles are opened to control fluid to enter the moulds (the next work, the lower ends of the hot runner and the hot runner can melt the raw materials remained in the moulds normally. The existing hot runner is limited by the structure, the distance between the nozzle at the lower end of the hot runner and the upper end of the sprue of the mold is fixed, so that when the height of the mold is changed too much, the probability can cause the influence of the lower end of the nozzle and the upper end of the sprue of the mold because the distance is too large, and the fluid raw material flowing out from the subsequent nozzle is influenced by the environmental disturbance airflow and cannot effectively enter the sprue, so that the fluid raw material overflows out of the sprue, and the adverse effect is brought to the production. Moreover, when the distance between the lower end of the nozzle and the upper end of the pouring gate is too large, the external cold air can cause the fluid raw material flowing out of the lower end of the nozzle to be poor in cooling fluidity, so that the quality of a finished product poured by a subsequent die is poor. Finally, the existing hot runner does not have a practical temperature detection mechanism, and after the temperature of the hot runner body is reduced during working (for example, the raw material is stopped being input by heating and melting equipment, and the raw material does not enter the shell after hot melting), the hot runner body can cause adverse effects on normal production. In summary, it is very necessary to provide a hot runner apparatus capable of conveniently changing the distance between the nozzle and the mold gate, ensuring that the lower end of the nozzle and the upper end of the gate are attached as much as possible, and monitoring temperature data in real time.

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 based on the hot runner body, under relevant mechanism combined action in the application, can conveniently adjust the interval between nozzle lower extreme and the mould runner upper end, and adjust back nozzle lower extreme and runner upper end and be in the state of coincide automatically, can in time indicate the staff to maintain when during operation temperature reduces unusually, but guaranteed the hot runner device of follow-up pouring back product quality.

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

a height-adjustable hot runner device comprises a plurality of hot runner bodies, a stabilized voltage power supply, an electric push rod and a power switch, and is characterized by also comprising a temperature detection circuit, a detection mechanism and a control circuit; the temperature detection circuit is matched with a temperature switch, the temperature switch is installed at the outer side end of the hot runner body shell, the lower end of the electric push rod is installed at the upper end of the shell, the upper end of the electric push rod is installed below a rack of the heating and melting equipment, a movable pipe is sleeved in a feeding pipe of the hot runner body, and the upper end of the movable pipe is connected with a discharging pipe of the heating and melting equipment; the detection mechanism comprises a movable rod and a force sensitive resistor, the movable rod is arranged at the outer side end of one of the hot runner bodies, and the force sensitive resistor is arranged at the lower end of the movable rod; the temperature detection circuit, the control circuit, the voltage-stabilized power supply and the power switch are arranged in the electric cabinet; two wiring terminals of the temperature switch are electrically connected in series between two signal input ends of the temperature detection circuit, a power output end of the control circuit is electrically connected with a power input end of the electric push rod, and two wiring terminals of the force-sensitive resistor are electrically connected in series between two signal input ends of the control circuit.

Further, the temperature detection circuit comprises a resistor, NPN triodes and a buzzer which are electrically connected, one end of the first resistor is connected with the input end of the positive power supply of the buzzer, the other end of the second resistor is connected with the base electrode of the first NPN triode, the collector electrode of the first NPN triode is connected with the other end of the first resistor and the base electrode of the second NPN triode, the emitting electrodes of the two NPN triodes are connected, the emitting electrodes of the two NPN triodes Q1 and Q2 are connected, and the collector electrode of the second NPN triode Q2 is connected with the input end of the negative power supply of the buzzer B.

Further, the height of the lower part of the force-sensitive resistor is higher than the height of the lower end of a nozzle of the hot runner body.

Further, the control circuit comprises a resistor, an NPN triode and a relay which are electrically connected, one end of the 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 relay, the negative control power input end of the relay is connected with the emitter electrode of the NPN triode, and the input end of the positive control circuit of the relay is connected with the input end of the positive power.

The utility model discloses beneficial effect is: this is novel based on hot runner body, causes the temperature reduction back because of various reasons in the casing in using, and temperature detect circuit's bee calling organ can in time sound production suggestion staff inspect concrete reason, has guaranteed the normal clear of production progress. When the heights of the upper ends of different molds and the distance between the lower ends of the nozzles are too large in actual production, a worker can conveniently adjust the distance between the lower ends of the nozzles and the upper ends of the gates of the molds by adjusting the power switch, the adjustment is in place, the lower ends of the nozzles are positioned in the gates, the upper ends of the nozzles can be automatically in an inosculated state, the intelligent control purpose is achieved, and the quality of products after subsequent pouring is guaranteed. 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 height-adjustable hot runner apparatus includes a plurality of hot runner bodies 1 (an electric heating mechanism 2 is installed between an outer layer and an inner layer of the outer layer), a regulated power supply A1, an electric push rod M, and a power switch S, wherein the plurality of hot runner bodies are provided with a housing 3, a feeding pipe 4, and an electric driving mechanism 5, a valve rod driven by the electric driving mechanism 5 is vertically installed in each hot runner body 1 (the electric driving mechanism 5 is located outside the upper end of the housing, the upper end of the valve rod and a lower movable shaft of the electric driving mechanism 5 are welded together, and the valve rod enters the hot runner body via the upper end of the hot runner body), during operation, a worker controls the electric driving mechanism 5 to drive the valve rod to move downwards via the power switch to close the inner lower end of a nozzle 6 of the hot runner body and close a fluid material entering a mold (the upper end of the nozzle 6 is installed at the lower end of the hot runner body 1 and has a fluid hole in the lower middle part), or opens the lower end of the hot runner body 6 to control fluid entering the mold (the lower end of the hot runner body, the hot runner body is opened by the electric heating mechanism 2, which the solidified material remained in the hot runner body is fused in the hot runner, which the hot runner body is installed at the lower end of the upper end of the hot runner body, and the upper end of the hot runner 3, and the lower end of the hot runner body, and the hot runner 3, and the hot runner body are connected in parallel with the housing, and the hot runner 3, and the upper end of the hot runner 3, and the hot runner body, and the hot runner 3, and the hot runner body are connected with the hot runner 3; also has a temperature detection circuit 7, a detection mechanism and a control circuit 8; the temperature detection circuit is matched with a temperature switch W, the temperature switch W is arranged at the right side end outside the shell 3 through a screw nut, a fixing clamp and the like, two sets of electric push rods M are arranged, the lower ends of movable rods M are vertically distributed and are respectively arranged at the middle parts of two sides of the upper outer end of the shell 3 through the screw nut, the upper ends of the cylinders of the two sets of electric push rods M are respectively arranged on a rack at the lower end of the heating and melting equipment through the screw nut, a movable pipe 9 is sleeved in the feeding pipe, the upper end of the movable pipe 9 is connected with a discharging pipe of the heating and melting equipment together (the outer side of the movable pipe 9 is in close contact with the inner side of the feeding pipe 4 and can move up and down, when the shell is driven by the electric push rods M to move up and down, the movable pipe 9 moves up and down along the feeding pipe 4, and when the height of the shell is changed up and down, fluid raw materials output by the discharging pipe of the heating and melting equipment can enter a mold); the detection mechanism comprises a movable rod 10 and a force-sensitive resistor RT, a connecting rod 11 is transversely welded outside the left end of a hot runner body at the left lower end of the shell 3, the left end of the connecting rod 11 is provided with an internal thread hole, the outside of the movable rod 10 is provided with an external thread, the movable rod 10 is screwed into the internal thread of the connecting rod 11 through the external thread and vertically distributed and installed on the connecting rod 11, the upper end of the movable rod 10 is welded with a circular handle (the height of the movable rod 10 can be conveniently adjusted by workers in a rotating way, the lower end of the force-sensitive resistor can be contacted with the upper position of the side end of a mold gate after a nozzle is positioned in the mold gate), the force-sensitive resistor RT is installed on a circular circuit board, the circuit board is connected to the lower end of the movable rod through glue, and a strain gauge of the force-sensitive resistor RT is positioned at the lower part; the temperature detection circuit 7, the control circuit 8, the voltage-stabilizing power supply A1 and the power switch S (a handle is positioned outside the electric cabinet 12) are arranged in the electric cabinet 12, and the electric cabinet 12 is arranged on the wall surface of a production area.

As shown in FIGS. 1 and 2, the regulated power supply A1 is a finished product of a 220V/12V/1KW switching power supply module with a mode of converting 220V alternating current into 12V direct current. The temperature detection circuit comprises resistors R and R2, NPN triodes Q1 and Q2 and a buzzer B which are connected through circuit board wiring, one end of a first resistor R2 is connected with the positive power input end of the buzzer B, the other end of a second resistor R is connected with the base of the first NPN triode Q1, the collector of the first NPN triode Q1 is connected with the other end of the first resistor R2 and the base of the second NPN triode Q2, the emitting electrodes of the two NPN triodes Q1 and Q2 are connected, and the collector of the second NPN triode Q2 is connected with the negative power input end of the buzzer B. The lower part of the force sensitive resistor RT is higher than the lower end of the nozzle. The control circuit comprises a resistor R1, an NPN triode Q3 and a relay K1 which are connected through circuit board wiring, one end of the resistor R1 is connected with a base electrode of the NPN triode Q3, a collector electrode of the NPN triode Q3 is connected with a negative electrode power supply input end of the relay K1, a negative electrode control power supply input end of the relay K1 is connected with an emitting electrode of the NPN triode Q3, and an anode control circuit input end of the relay K1 is connected with an anode power supply input end. The power input ends 1 and 2 of a stabilized power supply A1 and two poles of an alternating current 220V power supply are respectively connected through leads, the power output ends 3 and 4 of the stabilized power supply A1 and the power input ends 1 and 2 of a power switch S, one end of a power input end resistor R2 of a temperature detection circuit and an emitting electrode of an NPN triode Q1 are respectively connected through leads, two wiring ends of a temperature switch W are respectively connected between the positive power input end of a buzzer B and the other end of a resistor R of the temperature detection circuit in series through leads, the power output ends 3 and 4 of the power switch S, the positive and negative pole power input ends of two sets of electric push rods M, the positive power input end of a control power input end relay K1 and the emitting electrode of the NPN triode Q3 of the control circuit are respectively connected through leads, two normally closed contact ends of a power output end relay K1 of the control circuit and the negative and positive pole power input ends of two sets of the electric push rods M are respectively connected through leads, and two wiring ends of a force-sensitive resistor RT are respectively connected between the other end of two signal input end resistors R1 of the control circuit and the 3 of the stabilized power supply A1 in series through leads.

Fig. 1 and 2 show that the novel hot runner body 1 is based on, the using method of the novel hot runner body 1 is completely consistent with that of the 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 shell 3 and a feed pipe 4, then enter a plurality of casting molds through a plurality of gates of the molds through nozzles 6 at the lower ends of the plurality of hot runner bodies 1, and the plurality of hot runner bodies 1 ensure that raw material fluid output by the heating and melting device in the previous process is kept in a molten state before entering the molds through a mold plastic raw material inlet (gate) by a method of an electric heating mechanism 2 (the electric heating mechanism heats the fluid flowing through the inside after being electrified), so that the fluid raw materials entering the molds are uniformly dispersed, and a powerful technical support is provided for ensuring the quality of the cast plastic products; in practical situations, if a worker controls the electric driving mechanism 5 through other power switches to drive the valve rod 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 5 controls the valve rod to move upwards, the lower end in the hot runner body 1 is not closed any more, and the fluid raw material enters the mold through the nozzle. After the main power switch S1 is turned on, 220V power enters the power input end of the stabilized voltage power supply A1,

pins

3 and 4 of the stabilized voltage power supply A1 can output stable direct current 12V power and enter the power input ends of the temperature detection circuit, the power switch S and the control circuit. After the temperature detection circuit is powered on to work, when the temperature of the shell is proper (for example, higher than 200 ℃, namely when the whole device works normally), the internal contact of the temperature switch W is closed, so that a 12V power supply can be subjected to voltage reduction and current limitation through the resistor R and enters the base electrode of the NPN triode Q1, the NPN triode Q1 is conducted, the collector outputs a low level and enters the base electrode of the NPN triode Q2, the NPN triode Q2 is cut off, and then the buzzer B does not sound. When the temperature of the shell is not proper (for example, the temperature is lower than 200 ℃, namely the whole equipment works abnormally), the internal contact of the temperature switch W is opened, so that the 12V power supply does not enter the base electrode of the NPN triode Q1 through the voltage reduction and current limitation of the resistor R any more, the base electrode of the NPN triode Q2 obtains proper forward bias voltage through the voltage reduction and current limitation of the resistor R2, the collector electrode of the NPN triode Q2 is conducted to output low level to enter the negative power supply input end of the buzzer B, and the buzzer B is electrified to give a loud prompt sound to prompt a worker to check specific reasons, thereby ensuring the normal operation of the production progress.

Fig. 1 and 2 show, in this novel practical application, when nozzle lower extreme and mould runner upper end interval were too big or undersize, the staff stirred switch S ' S handle left or right, then, switch S ' S1, 2 feet and 3, 4 feet or 5, 6 feet communicate respectively, so, 12V power two poles of the earth can get into two sets of electric putter M ' S positive and negative two poles power input end through switch S ' S3, 4 feet, or get into two sets of electric putter M ' S two control power input ends through switch S ' S5, 6 feet and relay K1, two normally closed contact ends get into two sets of electric putter M ' S negative and positive two poles power input end. And in the time when the positive and negative pole power supply input ends of the two sets of electric push rods M are electrified, the movable rods of the two sets of electric push rods M drive the shell to integrally move upwards to a height and pull the distance between the mold gates, and the power supply switch is turned off after the required height is reached. And in the time when the negative and positive power supply input ends of the two sets of electric push rods M are electrified, the movable rods of the two sets of electric push rods M drive the shell to integrally descend and the distance between the mold gates is reduced. In practical situations, when the lower end of the nozzle does not enter the corresponding nozzle, the strain gauge of the force sensitive resistor RT is relatively large in stress resistance value (about 8M), so that the voltage of a 12V power supply which is subjected to voltage reduction and current limitation through the force sensitive resistor RT and the resistor R1 enters an NPN triode Q3, the base voltage is lower than 0.7V, the NPN triode Q1 cut-off relay K1 cannot be electrified to control the input end of the power supply and the normally closed contact end to be continuously closed, and then the electric push rod M continuously pushes the shell, the hot runner body and the like to move downwards. In practical situations, after the lower end of the nozzle enters the corresponding gate, the strain gauge of the force-sensitive resistor RT and a die (not shown in the figure) at the side end of the gate are relatively large in contact stress and relatively small in resistance value (about 400K), so that a 12V power supply enters an NPN triode Q3 base voltage higher than 0.7V after being subjected to voltage reduction and current limitation through the force-sensitive resistor RT and a resistor R1, the NPN triode Q3 conducts a collector to output low level and enters the input end of a negative power supply of a relay K1, the relay K1 is electrified and closed to control the input end of the power supply and an open circuit of a normally closed contact end, an electric push rod M is not powered to push a shell and a hot runner body to move downwards, the lower end of the nozzle is automatically in an inosculated state after being located at the upper end in the gate, the purpose of intelligent control is achieved, and the quality of a product after subsequent pouring is guaranteed. In fig. 2, the temperature switch W is a kick type normally open contact temperature switch (200 ℃) of type KSD 301; the relay K1 is a DC12V relay; the resistances R1 and R, R2 are respectively 10K, 100K and 47K; the model of NPN triodes Q1, Q2 and Q3 is 9013; the buzzer B is an active continuous sound buzzer alarm finished product with the model SF 12V; the electric push rod M is a finished product of a reciprocating electric telescopic rod with the working voltage of direct current of 12V and the power of 100W. The force sensitive resistor RT is model FSR402.

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 height-adjustable hot runner device comprises a plurality of hot runner bodies, a stabilized voltage power supply, an electric push rod and a power switch, and is characterized by also comprising a temperature detection circuit, a detection mechanism and a control circuit; the temperature detection circuit is matched with a temperature switch, the temperature switch is installed at the outer side end of the hot runner body shell, the lower end of the electric push rod is installed at the upper end of the shell, the upper end of the electric push rod is installed below a rack of the heating and melting equipment, a movable pipe is sleeved in a feeding pipe of the hot runner body, and the upper end of the movable pipe is connected with a discharging pipe of the heating and melting equipment; the detection mechanism comprises a movable rod and a force sensitive resistor, the movable rod is arranged at the outer side end of one of the hot runner bodies, and the force sensitive resistor is arranged at the lower end of the movable rod; the temperature detection circuit, the control circuit, the voltage-stabilized power supply and the power switch are arranged in the electric cabinet; two wiring terminals of the temperature switch are electrically connected in series between two signal input ends of the temperature detection circuit, a power output end of the control circuit is electrically connected with a power input end of the electric push rod, and two wiring terminals of the force-sensitive resistor are electrically connected in series between two signal input ends of the control circuit.

2. The hot-runner apparatus with adjustable height according to claim 1, wherein the temperature detection circuit comprises a resistor, an NPN transistor and a buzzer, the resistor, the NPN transistor and the buzzer are electrically connected, one end of the first resistor is connected to the positive power input terminal of the buzzer, the other end of the second resistor is connected to the base of the first NPN transistor, the collector of the first NPN transistor is connected to the other end of the first resistor and the base of the second NPN transistor, the emitters of the two NPN transistors are connected, the emitters of the two NPN transistors Q1 and Q2 are connected, and the collector of the second NPN transistor Q2 is connected to the negative power input terminal of the buzzer B.

3. The hot-runner apparatus of claim 1, wherein the lower portion of the force sensitive resistor is higher than the lower end of the nozzle of the hot-runner body.

4. The apparatus according to claim 1, wherein the control circuit comprises a resistor, an NPN transistor, and a relay electrically connected to each other, wherein one end of the resistor is connected to a base of the NPN transistor, a collector of the NPN transistor is connected to a negative power input of the relay, a negative control power input of the relay is connected to an emitter of the NPN transistor, and a positive control circuit input of the relay is connected to a positive power input.