CN115027002A - Locking type nozzle for injection molding machine and molding method - Google Patents
Locking type nozzle for injection molding machine and molding method Download PDFInfo
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- CN115027002A CN115027002A CN202210765582.7A CN202210765582A CN115027002A CN 115027002 A CN115027002 A CN 115027002A CN 202210765582 A CN202210765582 A CN 202210765582A CN 115027002 A CN115027002 A CN 115027002A
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000001746 injection moulding Methods 0.000 title claims abstract description 34
- 238000000465 moulding Methods 0.000 title claims abstract description 12
- 230000009471 action Effects 0.000 claims abstract description 62
- 238000002347 injection Methods 0.000 claims abstract description 53
- 239000007924 injection Substances 0.000 claims abstract description 53
- 230000007704 transition Effects 0.000 claims abstract description 29
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 239000003921 oil Substances 0.000 claims description 51
- 239000000463 material Substances 0.000 claims description 28
- 230000008569 process Effects 0.000 claims description 24
- 238000004519 manufacturing process Methods 0.000 claims description 19
- 238000003860 storage Methods 0.000 claims description 18
- 238000003825 pressing Methods 0.000 claims description 12
- 239000010720 hydraulic oil Substances 0.000 claims description 8
- 230000002159 abnormal effect Effects 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 239000000498 cooling water Substances 0.000 claims description 4
- 230000000007 visual effect Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000012768 molten material Substances 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000005266 casting Methods 0.000 abstract description 3
- 238000013461 design Methods 0.000 abstract description 3
- 239000011797 cavity material Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 4
- 238000000748 compression moulding Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000002026 carminative effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/20—Injection nozzles
- B29C45/23—Feed stopping equipment
- B29C45/231—Needle valve systems therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/7613—Measuring, controlling or regulating the termination of flow of material into the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76655—Location of control
- B29C2945/76658—Injection unit
- B29C2945/76688—Injection unit nozzle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76822—Phase or stage of control
- B29C2945/76859—Injection
Abstract
The invention discloses a locking type nozzle for an injection molding machine and a molding method, wherein the locking type nozzle comprises a nozzle transition body, a nozzle head, a nozzle valve core, a nozzle charging barrel, a limit switch and a nozzle oil cylinder; the nozzle transition body is positioned at the front part of a charging barrel before injection of the injection molding machine and is fixedly connected with the nozzle head through the nozzle charging barrel; the nozzle valve core is fixedly connected with a piston rod of the nozzle oil cylinder, and the nozzle valve core is sleeved on the nozzle transition body and finally sleeved on the nozzle head; three limit switches capable of sensing corresponding positions are respectively arranged at the initial position, the stroke middle point and the final position of a piston rod on the nozzle oil cylinder, and the working condition of the nozzle is transmitted to the controller in a digital input mode. The invention effectively opens and closes the nozzle head through unique structural advantages and special program action design, adapts to large equivalent injection working conditions, ensures that enough back pressure can be generated in the nozzle during closing, ensures molding pressure, improves the reliability of closing the nozzle, and reduces the possibility of raw material flow casting to the maximum extent.
Description
Technical Field
The application relates to the field of injection machines, in particular to a locking nozzle for preventing mold cavity material returning and a molding method.
Background
The production of the filter plate used on the filter press can be realized only by at least three main steps of plasticizing by an extruder, manually transferring and compacting by a hydraulic press, the production process needs to be carried out at a plurality of stations, the production position transfer needs time, excessive time cost is consumed, and the possibility of missing the process window period exists. And the brand new filter-pressing plate production scheme of the Tairui machine utilizes the technical advantages of large-scale extrusion molding and is matched with a vertical machine for molding the filter-pressing plate, so that one-step molding of the filter-pressing plate can be realized, redundant working steps are reduced, and the product production can be completed by one-time injection.
At present, an injection compression molding process is adopted in the production process of the filter pressing plate, the injection pressure is low during injection, but in the secondary die closing process, the pressure of a die cavity is increased, and the pressure of materials flowing back from the die cavity is high. Meanwhile, in the compression molding process of the large product filter pressing plate, although the air exhaust is arranged around the mold to solve the problem of air holes of the product, the air holes near the sprue, namely in the middle area of the product, are difficult to solve. Special processes and new nozzles are therefore required to adapt to such conditions.
Disclosure of Invention
The invention aims to solve the problems of nozzle leakage, air holes of products and the like caused by mold cavity raw material backflow during large-scale product molding, and provides a novel nozzle for solving the problem of mold cavity backflow and a molding method for solving the problem of air holes of large-scale products.
The invention adopts the technical scheme that the invention achieves the aim that: a locking type nozzle for an injection molding machine comprises a nozzle transition body, a nozzle head, a nozzle valve core, a nozzle charging barrel, a limit switch and a nozzle oil cylinder; the nozzle transition body is positioned at the front part of the injection front charging barrel of the injection molding machine and forms an inclined channel with the storage channel of the injection front charging barrel, and the front part of the nozzle transition body is fixedly connected with the nozzle head through the nozzle charging barrel; the nozzle oil cylinder is fixed outside the nozzle transition body, the nozzle valve core is fixedly connected with a piston rod of the nozzle oil cylinder, and the piston rod of the nozzle oil cylinder drives the nozzle valve core to move; the nozzle valve core is sleeved in the nozzle transition body and finally sleeved in the nozzle head; the nozzle transition body is provided with a guide hole matched with the nozzle valve core, a material hole channel is arranged at the position of the guide hole of the nozzle transition body and the connecting hole of the nozzle charging barrel, and molten materials in the charging barrel flow into the nozzle charging barrel through the inclined hole of the nozzle transition body before injection.
The nozzle oil cylinder is positioned on the central line of the nozzle head to realize the opening and closing actions of the nozzle. Preferably, three limit switches capable of sensing corresponding positions, namely an on-end position limit switch, an off-middle position limit switch and an off-end position limit switch, are respectively arranged at the initial position, the stroke middle point and the final position of a piston rod on the nozzle oil cylinder, and the working condition of the nozzle is transmitted to the controller in a digital input mode.
Preferably, in the material plasticizing process, when the piston rod is positioned at the closed final position limit switch, the head of the nozzle valve core connected to the nozzle oil cylinder protrudes out of the nozzle, and meanwhile, the nozzle valve core is matched with the main sprue on the mold and plays a role in sealing.
Preferably, the nozzle oil cylinder is provided with a cooling device, namely, a cooling water jacket is sleeved on the nozzle oil cylinder body, and a water inlet and outlet interface is arranged on the nozzle oil cylinder body to cool the nozzle oil cylinder body; the working condition required by the oil cylinder is ensured, the high temperature caused by frequent reciprocating motion is avoided, the service life and the performance of hydraulic oil are influenced, the cooling effect of the oil cylinder and the service life of related sealing parts are improved, and the working stability of the nozzle is improved.
The forming method (especially the injection molding of large-scale products) of the locking type nozzle for the injection molding machine comprises the following steps:
a) starting an injection production period, preparing a vertical press to start die assembly, and pre-pressing a press template along a pull rod;
b) when the controller scans that a signal for the in-place die closing of the press is input, the injection seat moves forwards, the controller continuously gives a digital output signal to an action valve of the nozzle oil cylinder, and an oil cylinder rod moves backwards to drive a valve core to open to perform opening action of the nozzle;
c) when the valve core reaches an opening end position, the opening end limit switch is activated, a signal is input to the controller, the controller scans the signal and then continuously gives an opening signal to an action valve of the plasticizing plunger, and the molten raw material starts to be pushed forwards and is injected into the mold after passing through the nozzle transition body, the charging barrel and the nozzle head;
d) after the injection is finished, the injection piston reaches an injection end position, the controller continues to give a signal to the injection action valve after receiving an injection end signal, the working pressure of the piston is maintained for pressure maintaining and timing is started, after the preset pressure maintaining time is finished, the controller continuously gives a digital output signal to the action valve of the nozzle oil cylinder, the oil cylinder rod moves forwards to drive the valve core to close, and the closing action of the nozzle is carried out;
e) in the closing process of the nozzle, when the closing stroke midpoint is reached, the closing position limit switch is activated, the closing action of the valve core is stopped at the moment, the controller starts to control the vertical pressing die to compress and exhaust the product, and when the pressure sensor detects that the pressure of the press machine is sufficient, the controller continues to control the closing of the valve core of the nozzle;
f) when the valve core completely closes the nozzle, the closing end limit switch is activated, the controller starts to control the plasticizing motor to drive the screw to store materials, and after the material storage end position is reached, one working cycle is finished.
In order to solve the problem that in the injection process, bubbles are brought into raw materials in the injection process of a mold cavity to influence the final appearance of a product, the nozzle is closed before storage is set, the valve core stops acting after contacting a limit switch at a closing position, a pressing machine pressure in-place signal is waited, the nozzle closing signal is continuously output until the nozzle is at a closing end position, and then storage action is carried out.
Preferably, the nozzle closing signal is continuously output in the storing process, so that the situation that the molten raw material pushes the nozzle open in the storing process to cause the raw material casting of the plasticizing unit is prevented.
Preferably, the hydraulic oil path on the nozzle oil cylinder is provided with a hydraulic self-locking valve, so that the condition that the valve core of the nozzle is jacked open due to the increase of the pressure of the cavity when the nozzle stops operating is avoided.
Preferably, in order to avoid the situation that the nozzle valve core moves backwards when the hydraulic oil cylinder unexpectedly moves backwards in the material storage process, the nozzle valve core moves backwards and leaves the position of the limit switch at the final position of the switch, and the material storage action is interrupted to influence the normal work, so that the plasticizing effect is insufficient. If the opening action of the nozzle is not detected in the plasticizing process, the controller continuously controls the material storage action to be carried out, and abnormal work caused by the retreating action of the nozzle valve core is avoided.
Preferably, to ensure the integrity of the cycle and to meet the initial operating conditions and establish a sufficient pressure flow environment, the nozzle is set to automatic production and the controller starts the cycle from the first step of the cycle when the controller scans the signal that allows the rising edge of the injection signal.
Preferably, in order to ensure the continuity and the consistency of the action of the nozzle valve core, when the nozzle switch button is pressed in a manual operation state, the nozzle performs the switch action, and the switch action is stopped immediately after the button is released, so that the condition that the nozzle valve core reaches the starting point and the ending point by pressing the button once is avoided, and the action controllability and the operation accuracy are improved.
Preferably, in order to integrate the related functions of the new nozzle structure into a new model, the panel of the controller is added with the screen elements and setting options of the use of the hydraulic nozzle, the pressure flow setting of the hydraulic nozzle, the time setting or the limit switch state of the hydraulic nozzle and the limitation of the opening and closing time of the nozzle, so that the operation state can be managed by the controller, and the related parameters of the nozzle during operation can be controlled and adjusted. Meanwhile, icons or vocabulary entry pictures are displayed during action, and a work monitoring module is added, so that an injection machine operator can obtain visual work feedback from a controller panel, the working condition is determined according to the monitoring pictures, the related working problems are checked, and the predictability of the production condition and the flexibility of the production plan are improved.
Preferably, when an abnormal working condition occurs, the controller panel will generate a corresponding alarm prompt: when the opening or closing action of the nozzle exceeds the set time, the controller alarms 'nozzle opening overtime' or 'nozzle closing overtime'; when the injection molding machine is in an automatic working state, the controller alarms ' waiting for the press to allow the injection signal ' after the time of waiting for the press to allow the injection signal ' exceeds 2 min. And the abnormal working state is timely reminded to the operators of the plastic machine, so that the smooth production is ensured.
The invention relates to a locking type nozzle for an injection molding machine and a molding method, which solve the problems of backflow and material leakage caused by insufficient sealing in the large equivalent injection process of a common nozzle structure.
Drawings
FIG. 1 is a schematic structural view of a locking nozzle for an injection molding machine according to the present invention;
FIG. 2 is a schematic view of a locking nozzle for an injection molding machine according to the present invention;
FIG. 3 is a schematic diagram of an oil cylinder structure of a locking nozzle for an injection molding machine according to the present invention;
FIG. 4 is a schematic view of a locking nozzle and a mold for an injection molding machine according to the present invention;
FIG. 5 is a sequence diagram of the operation of the method for forming a large-sized product by a locking nozzle for an injection molding machine according to the present invention.
In the figure: 1. the injection molding machine comprises a charging barrel before injection, 2, a transition body, 3, a nozzle head, 4, a pull rod, 5, a press, 6, a nozzle oil cylinder, 7, a nozzle valve core, 8, a nozzle charging barrel, 9, a novel injection nozzle, 10, a mold, 11, a press template, 12, a hydraulic oil port, 13, a cylinder barrel, 14, a fixed seat, 15, a piston, an oil cylinder rod, 16, a cylinder bottom, 17, a cooling water port, 18 and a limit switch.
Detailed Description
The invention adopts the technical scheme that the invention achieves the aim that: a locking type nozzle for an injection molding machine is disclosed, as shown in fig. 1 and fig. 2, the locking type nozzle comprises a nozzle transition body 2, a nozzle head 3, a nozzle valve core 7, a nozzle material barrel 8, a limit switch 18 and a nozzle oil cylinder 6, wherein the nozzle transition body 2 is positioned at the front part of the material barrel 1 before injection of the injection molding machine and forms an inclined channel with a material storage channel of the material barrel 1 before injection, and the front part of the transition body 2 is fixedly connected with the nozzle head 3 through the nozzle material barrel 8; the nozzle oil cylinder 6 is fixed outside the transition body 2, as shown in fig. 3, the nozzle valve core 7 is fixedly connected with a piston rod 15 of the nozzle oil cylinder 6, so that the action of the valve core 7 is realized; the nozzle valve core 7 is sleeved in the nozzle transition body 2 and finally sleeved in the nozzle head 3; the transition body 2 is provided with a guide hole matched with the valve core 7, and a material hole channel is arranged around the guide hole.
The nozzle cylinder 6 is positioned on the central line of the nozzle head 3 to realize the opening and closing actions of the nozzle. Preferably, three limit switches 18 capable of sensing corresponding positions are respectively arranged at the initial position, the stroke midpoint and the final position of the piston rod on the nozzle oil cylinder, the three limit switches 18 are respectively an on-final position limit switch, an off-middle position limit switch and an off-final position limit switch, and the working condition of the nozzle is transmitted to the controller in a digital input mode.
The invention relates to a method for forming a locking nozzle for an injection molding machine, which comprises the following steps of:
a) when the injection production period starts, the vertical press 5 is ready to close the die, and the press template 11 is pre-pressed along the pull rod 4;
b) when the controller scans the signal input of the in-place mold closing of the press 5, the injection seat moves forwards, the controller continuously gives out a digital output signal to the action valve of the nozzle oil cylinder 6, and the oil cylinder rod 15 moves backwards to drive the valve core 7 to open to perform the opening action of the nozzle 9;
c) when the valve core 7 reaches an opening end position, the opening end limit switch is activated, a signal is input to the controller, the controller scans the signal and then continuously gives an opening signal to an action valve of the plasticizing plunger, and the controller starts to push the molten raw material forwards to inject into the mold 10 after passing through the nozzle transition body 2, the charging barrel 1 and the nozzle head 3;
d) after injection is finished, the injection piston reaches an injection end position, the controller continues to give a signal to the injection action valve after receiving an injection end signal, the working pressure of the piston is maintained for pressure maintaining and timing is started, after the preset pressure maintaining time is finished, the controller continuously gives a digital output signal to the action valve of the nozzle oil cylinder 6, the oil cylinder rod 15 moves forwards to drive the valve core 7 to close, and closing action of the nozzle 9 is carried out;
e) in the closing process of the nozzle 9, when the closing stroke midpoint is reached, the closing position limit switch is activated, the closing action of the valve core 7 is stopped at the moment, the controller starts to control the vertical pressing die to compress and exhaust products, and when the pressure sensor detects that the pressure of the press 5 is sufficient, the controller continues to control the closing of the nozzle valve core 7;
f) when the valve core 7 completely closes the nozzle, the closing end position limit switch is activated, at the moment, the controller starts to control the plasticizing motor to drive the screw to store materials, and after the material storage end position is reached, one working cycle is finished.
In order to solve the problem that bubbles are brought in to affect the final appearance of a product in the process of injecting raw materials into a cavity of a mold 10, the nozzle is closed before storage is set in a program, after the nozzle contacts a closing limit switch 18, a valve core stops acting, a pressure in-place signal of a press 5 is waited, after the pressure in the press 5 is in place, the nozzle closing signal is continuously output until the nozzle is closed to the final position, and then storage action is carried out.
In order to prevent the condition that the molten raw material jacks the nozzle to cause the casting of the raw material of the plasticizing unit in the material storage process, a nozzle closing signal is continuously output in the material storage process, and meanwhile, a hydraulic oil path on the nozzle oil cylinder 6 is provided with a hydraulic self-locking valve, so that the condition that the nozzle valve core 7 is jacked due to the increase of the pressure of a mold cavity when the action of the nozzle is stopped is avoided.
In order to avoid the situation that the nozzle valve core 7 is accidentally retreated by the hydraulic oil cylinder 6 in the material storing process, the valve core moves backwards, leaves the position of the final limit switch of the switch, and interrupts the material storing action to influence the normal work, so that the plasticizing effect is insufficient. If the nozzle opening action is not detected in the plasticizing process, the controller continuously controls the material storage action to be carried out, so that abnormal work caused by the backward movement action of the nozzle valve core 7 is avoided.
To ensure cycle integrity and meet initial operating conditions, a sufficient pressure flow environment is established, and the nozzle program is set to automatic production, the controller begins periodic production from the first step of the cycle when the controller scans the signal that allows the rising edge of the injection signal.
In order to ensure the continuity and the consistency of the action of the nozzle valve core 7, the nozzle performs the switching action when the nozzle switch key is pressed under the state of manual operation, the switching action is stopped immediately after the button is released, the condition that the nozzle valve core 7 reaches the starting point and the ending point by pressing the button once is avoided, and the action controllability and the control accuracy are improved.
In order to integrate the related functions of a new nozzle structure into a new machine type, picture elements and setting options of hydraulic nozzle use, hydraulic nozzle pressure flow setting, hydraulic nozzle time setting or limit switch state and nozzle switch action time limitation are added on a panel of a controller, so that the action state can be managed through the controller, and related parameters in the operation of the nozzle can be controlled and adjusted. Meanwhile, icons or vocabulary entry pictures are displayed during action, and a work monitoring module is added, so that an injection machine operator can obtain visual work feedback from a controller panel, the working condition is determined according to the monitoring pictures, the related working problems are checked, and the predictability of the production condition and the flexibility of the production plan are improved.
When abnormal working condition appears, the controller panel will appear corresponding alarm prompt: when the opening or closing action of the nozzle exceeds the set time, the controller alarms 'nozzle opening overtime' or 'nozzle closing overtime'; when the injection molding machine is in an automatic working state, the controller alarms ' waiting for the press to allow the injection signal ' after the time of waiting for the press to allow the injection signal ' exceeds 2 min. And abnormal working states are timely reminded to operators of the plastic machine, so that the smooth production is ensured.
Above for with this novel nozzle supporting control program and action design, have complete reasonable work logic, can effectively combine the nozzle structure, satisfy the action requirement in the technology production step, simultaneously a plurality of along journey detection device including such as limit switch in addition in time with real-time behavior feedback to the controller panel, improve the controllability of equipment and the rationality of work.
The invention relates to a nozzle for an injection molding machine and a molding method, which solve the problems of backflow and material leakage caused by insufficient sealing in the large equivalent injection process of a common nozzle structure. As shown in fig. 4, the head of the valve core connected to the nozzle cylinder protrudes out of the nozzle, and the valve core is matched and sealed with the main inlet gate of the mold. Through unique structural design advantage, effectively open and close the action at the nozzle case, as the carminative export of goods when half-open, solved the gas pocket problem of large-scale goods.
Besides the advantage of reliable opening and closing structure, the nozzle oil cylinder 6 is also provided with a cooling device, namely a cooling water jacket is sleeved on the nozzle oil cylinder body, and a water inlet and outlet interface 17 is arranged on the nozzle oil cylinder body to cool the nozzle oil cylinder body; the working condition required by the oil cylinder is ensured, the high temperature caused by frequent reciprocating motion is avoided, the service life and the performance of hydraulic oil are influenced, the cooling effect of the oil cylinder and the service life of related sealing parts are improved, and the working stability of the nozzle is improved.
It should be noted that the above-mentioned embodiments are merely illustrative of the principles of the present invention, and that various changes and modifications may be made therein without departing from the scope of the invention as claimed. Based on the embodiments described in the present invention, all other embodiments obtained by those skilled in the art based on the technical solutions of the present application without any creative work shall fall within the protection scope of the present invention.
Claims (10)
1. The utility model provides a locking formula nozzle for injection molding machine which characterized in that: the nozzle comprises a nozzle transition body, a nozzle head, a nozzle valve core, a nozzle charging barrel, a limit switch and a nozzle oil cylinder; the nozzle transition body is positioned at the front part of the injection front charging barrel of the injection molding machine and forms an inclined channel with the storage channel of the injection front charging barrel, and the front part of the nozzle transition body is fixedly connected with the nozzle head through the nozzle charging barrel; the nozzle oil cylinder is fixed outside the nozzle transition body, the nozzle valve core is fixedly connected with a piston rod of the nozzle oil cylinder, and the piston rod of the nozzle oil cylinder drives the nozzle valve core to move; the nozzle valve core is sleeved in the nozzle transition body and finally sleeved in the nozzle head; the nozzle transition body is provided with a guide hole matched with the nozzle valve core, a material hole channel is arranged at the position of the guide hole of the nozzle transition body and the connecting hole of the nozzle charging barrel, and molten materials in the charging barrel flow into the nozzle charging barrel through the inclined hole of the nozzle transition body before injection; the nozzle oil cylinder is positioned on the central line of the nozzle head, three limit switches capable of sensing corresponding positions are respectively arranged at the initial position, the stroke middle point and the final position of a piston rod on the nozzle oil cylinder, and the working condition of the nozzle is transmitted to the controller in a digital input mode.
2. The locking nozzle of claim 1, wherein: three limit switches capable of sensing corresponding positions are respectively arranged at the initial position, the stroke middle point and the final position of a piston rod on the nozzle oil cylinder and are respectively an open final position limit switch, a close middle position limit switch and a close final position limit switch, when the piston rod is positioned at the close final position limit switch, the head of a nozzle valve core connected on the nozzle oil cylinder protrudes out of a nozzle, and the nozzle valve core is matched with a main pouring gate on a mold and plays a role in sealing.
3. The locking nozzle of claim 1, wherein: the nozzle oil cylinder body is sleeved with a cooling water jacket, and is provided with a water inlet and outlet interface for cooling the nozzle oil cylinder body.
4. A method of molding a lock nozzle for an injection molding machine, using the lock nozzle for an injection molding machine according to claim 2, characterized by comprising the steps of:
the first step, the injection production cycle is started, the vertical press prepares to start die assembly, and a press template is pre-pressed along a pull rod;
secondly, when the controller scans the input of a signal that the mold closing of the press is in place, the injection seat moves forwards, the controller continuously gives a digital output signal to an action valve of the nozzle oil cylinder, and an oil cylinder rod moves backwards to drive the valve core to open to perform the opening action of the nozzle;
thirdly, when the valve core reaches an opening end position, the opening end limit switch is activated, a signal is input to the controller, the controller scans the signal and then continuously gives out an opening signal to an action valve of the plasticizing plunger, and the molten raw material starts to be pushed forwards and is injected into the mold after passing through the nozzle transition body, the charging barrel and the nozzle head;
fourthly, after the injection is finished, the injection piston reaches an injection end position, the controller continues to give a signal to the injection action valve after receiving an injection end signal, the working pressure of the piston is maintained for pressure maintaining and timing is started, after the preset pressure maintaining time is finished, the controller continuously gives a digital output signal to the action valve of the nozzle oil cylinder, the oil cylinder rod moves forwards to drive the valve core to close, and the closing action of the nozzle is carried out;
fifthly, in the closing process of the nozzle, when the closing stroke midpoint is reached, a closing position limit switch is activated, the closing action of the valve core is stopped at the moment, the controller starts to control the vertical pressing die to compress and exhaust the product, and when the pressure sensor detects that the pressure of the press machine is sufficient, the controller continues to control the closing of the valve core of the nozzle;
and sixthly, when the valve core completely closes the nozzle, the closing end limit switch is activated, the controller starts to control the plasticizing motor to drive the screw to store materials, and after the material storage end position is reached, one working cycle is finished.
5. The method of claim 4, wherein the step of forming the locking nozzle for an injection molding machine comprises: and a nozzle closing signal is continuously output in the material storage process.
6. The method of claim 4, wherein the step of forming the locking nozzle for an injection molding machine comprises: the hydraulic oil circuit on the nozzle oil cylinder is provided with a hydraulic self-locking valve.
7. The method of claim 4, wherein the step of forming the locking nozzle for an injection molding machine comprises: in the plasticizing process, the opening action of the nozzle is not detected, the controller continues to control the material storage action to be carried out, and abnormal work caused by the retreating action of the nozzle valve core is avoided.
8. The method of claim 4, wherein the step of forming the locking nozzle for an injection molding machine comprises: in the state of manual operation, when the nozzle switch button is pressed, the nozzle performs the switch action, and the switch action is stopped when the button is released.
9. The method of claim 4, wherein the step of forming the locking nozzle for an injection molding machine comprises: the panel of the injection molding machine controller is added with picture elements and setting options of hydraulic nozzle use, hydraulic nozzle pressure flow setting, hydraulic nozzle time setting or limit switch state and nozzle switch action time limitation, so that the action state can be managed through the controller, icon or entry picture display during action is increased, and a work monitoring module is added, so that an injection machine operator can obtain visual work feedback from the panel of the controller, the work condition is determined according to the monitoring picture, and related work problems are checked accordingly.
10. The method of claim 4, wherein the step of forming the locking nozzle for an injection molding machine comprises: the controller panel sets an alarm prompt: when the opening or closing action of the nozzle exceeds the set time, the controller alarms 'nozzle opening overtime' or 'nozzle closing overtime'; when the injection molding machine is in an automatic working state, the controller alarms 'waiting for the injection signal allowed by the press' after the time of the injection signal allowed by the press of the injection molding machine exceeds 2 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210765582.7A CN115027002B (en) | 2022-06-30 | 2022-06-30 | Locking type nozzle for injection molding machine and molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210765582.7A CN115027002B (en) | 2022-06-30 | 2022-06-30 | Locking type nozzle for injection molding machine and molding method |
Publications (2)
| Publication Number | Publication Date |
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| CN115027002A true CN115027002A (en) | 2022-09-09 |
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