CN115027002B - 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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- CN115027002B CN115027002B CN202210765582.7A CN202210765582A CN115027002B CN 115027002 B CN115027002 B CN 115027002B CN 202210765582 A CN202210765582 A CN 202210765582A CN 115027002 B CN115027002 B CN 115027002B
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000001746 injection moulding Methods 0.000 title claims abstract description 29
- 238000000465 moulding Methods 0.000 title claims abstract description 15
- 230000009471 action Effects 0.000 claims abstract description 56
- 238000002347 injection Methods 0.000 claims abstract description 51
- 239000007924 injection Substances 0.000 claims abstract description 51
- 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 40
- 239000000463 material Substances 0.000 claims description 29
- 230000008569 process Effects 0.000 claims description 27
- 238000003860 storage Methods 0.000 claims description 22
- 238000004519 manufacturing process Methods 0.000 claims description 16
- 238000003825 pressing Methods 0.000 claims description 9
- 230000002159 abnormal effect Effects 0.000 claims description 7
- 239000000498 cooling water Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 239000010720 hydraulic oil Substances 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 230000000007 visual effect Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000011835 investigation Methods 0.000 claims description 2
- 239000012768 molten material Substances 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 5
- 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
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000000748 compression moulding Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000005056 compaction Methods 0.000 description 1
- 238000003708 edge detection 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
- 239000000243 solution Substances 0.000 description 1
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 application 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 the feed cylinder before injection of the injection molding machine and is fixedly connected with the nozzle head through the nozzle feed cylinder; the nozzle valve core is fixedly connected with a piston rod of the nozzle oil cylinder, and is sleeved on the nozzle transition body and finally sleeved on the nozzle head; three limit switches which can sense the corresponding positions are respectively arranged at the starting position, the stroke midpoint and the end 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. According to the application, the nozzle head is effectively opened and closed through unique structural advantages and special program action design, a large-equivalent injection working condition is adapted, enough back pressure can be generated in the nozzle during closing, forming pressure is ensured, the closing reliability of the nozzle is improved, and the possibility of casting raw materials is reduced to the maximum extent.
Description
Technical Field
The application relates to the field of injection molding machines, in particular to a locking type nozzle for preventing a mold cavity from returning materials and a molding method.
Background
The filter plate production that uses on the pressure filter needs to pass through the extruder at least and plasticizes, artifical transportation, the hydraulic press compaction three main steps just can realize the production of product, and the in-process needs to go on in a plurality of stations, and because the production position is shifted and is required time, can consume too much time cost, and has the possibility of missing the technology window period. 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 the 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 production of products can be finished 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 mold closing process, the pressure of a mold cavity is increased, and the pressure of materials flowing back from the mold cavity is high. Meanwhile, for the large product filter press plate, in the compression molding process, although the air holes of the product are solved by arranging exhaust gas around the die, the problem of the air holes near the pouring gate, namely the middle area of the product, is difficult to solve. Special processes and new nozzles are therefore required to adapt to such conditions.
Disclosure of Invention
The application aims to solve the problems of nozzle leakage, air holes and the like caused by the backflow of the raw materials of a die cavity when a large product is formed, and discloses a novel nozzle for solving the problem of die cavity material returning and a forming method for solving the problem of air holes of the large product.
The technical scheme adopted by the application for achieving the aim of the application is as follows: 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 act; 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 connection hole of the guide hole of the nozzle transition body and the nozzle material barrel, and the molten material in the material barrel before injection flows into the nozzle material barrel through the inclined hole of the nozzle transition body.
The nozzle cylinder is positioned on the center 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-position limit switch, an off-position limit switch and an off-position limit switch, are respectively arranged at the starting position, the stroke midpoint and the end position of a piston rod on the nozzle 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 closing end position limit switch, the head part of the nozzle valve core connected with the nozzle oil cylinder protrudes out of the nozzle, and meanwhile, the nozzle valve core is matched with a main pouring gate on the die 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 cooling water jacket to cool the nozzle oil cylinder body; the required working condition of the oil cylinder is ensured, the high temperature caused by frequent reciprocating motion is avoided, the service life and 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 molding method (especially injection molding large-scale products) adopting the locking nozzle for the injection molding machine comprises the following steps:
a) Starting an injection production period, preparing a vertical press to start to mold, and pre-pressing a press template along a pull rod;
b) After the controller scans the signal input of the press die closing in place, the injection seat moves forward, the controller continuously gives out a digital output signal to the action valve of the nozzle oil cylinder, the oil cylinder rod moves backward, the valve core is driven to open, and the opening action of the nozzle is carried out;
c) When the valve core reaches an opening end position, an opening end limit switch is activated, a signal is input to a controller, the controller continuously gives an opening signal to an action valve of the plasticizing plunger after scanning the signal, and starts to push the molten raw material forwards, and injection is carried out in the die after passing through a nozzle transition body, a charging barrel and a nozzle head;
d) After the injection is finished, the injection piston reaches an injection end position, the controller continuously gives a signal to the injection action valve after receiving the injection end signal, maintains the working pressure of the piston to keep the pressure and starts timing, and continuously gives a digital output signal to the action valve of the nozzle oil cylinder after the preset pressure maintaining time is finished, and the oil cylinder rod moves forwards to drive the valve core to be closed so as to perform the closing action of the nozzle;
e) In the closing process of the nozzle, when the closing stroke midpoint is reached, a Guan Zhongwei position limit switch is activated, the closing action of the valve core is stopped at the moment, the controller starts to control the vertical compression mold to compress and exhaust products, and when the pressure sensor detects that the press has built up sufficient pressure, the controller continues to control the closing of the valve core of the nozzle;
f) When the valve core is completely closed, the closing limit switch is activated, at the moment, the controller starts to control the plasticizing motor to drive the screw rod to store materials, and one working cycle is ended after the valve core reaches the storage end position.
In order to solve the problem that the final appearance of a product is influenced by bringing bubbles into raw materials in the injection process of a die cavity in the injection process, the nozzle is firstly closed before the storage is set, the valve core stops moving after contacting with the closed position limit switch, the pressure of a press is waited for a signal in place, the pressure of the press is continued to output a nozzle closing signal until the nozzle is closed to the final position, and then the storage is carried out.
Preferably, the nozzle off signal is continuously output in the material storage process, so that the situation that the melted raw material is ejected out of the nozzle in the material storage process to cause casting of the raw material of the plasticizing unit is prevented.
Preferably, a hydraulic self-locking valve is arranged on a hydraulic oil way on the nozzle oil cylinder, so that the situation that a nozzle valve core is jacked up due to the increase of the pressure of a die cavity when the nozzle action is stopped is avoided.
Preferably, in order to avoid the situation that the nozzle valve core is retreated accidentally in the material storage process, the nozzle valve core moves backwards and leaves the position of the limit switch at the final position, the normal work is influenced by the interruption of the material storage action, and 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, and abnormal work caused by the retreating action of the nozzle valve core is avoided.
Preferably, to ensure cycle integrity and to meet initial operating conditions, a sufficient pressure flow environment is established and the nozzle is set to produce automatically, the controller begins the cycle from the first step of the cycle after the controller scans the enable injection signal rising edge signal.
Preferably, in order to ensure the consistency and the always of the movement of the nozzle valve core, when the nozzle switch key is pressed in a manual operation state, the nozzle is switched, and the switching movement is stopped after the button is released, so that the condition that the nozzle valve core reaches the starting and ending point after the button is pressed once is avoided, and the movement controllability and the control accuracy are improved.
Preferably, in order to integrate the related functions of the new nozzle structure into a new model, screen elements and setting options for 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 the controller, so that the action state can be managed through the controller, and the related parameters in the operation of the nozzle can be controlled and adjusted. Meanwhile, the display of icons or entry pictures in the action process is increased, and the work monitoring module is increased, so that an injector operator can obtain visual work feedback from the controller panel, the work condition is determined according to the monitoring picture, the related work problems are checked, and the predictability of the production condition and the flexibility of the production plan are improved.
Preferably, when abnormal working conditions occur, the controller panel will present corresponding alarm prompts: when the opening or closing action of the nozzle exceeds the set time, the controller alarms the nozzle opening overtime or the nozzle closing overtime; when the injection molding machine is in an automatic working state, after the time for waiting for the press to allow the injection signal exceeds 2 minutes, the controller alarms to wait for the press to allow the injection signal. In time reminds the plastic machine operators of abnormal working states, and ensures the smooth production work.
The locking type nozzle for the injection molding machine and the molding method solve the problems of backflow and leakage caused by insufficient sealing in the large-equivalent injection process of a common nozzle structure, effectively open and close a valve core of the nozzle through the unique structural design advantage, and serve as an exhaust outlet of a product in half-open process, so that the problem of air holes of a large-scale product is solved.
Drawings
FIG. 1 is a schematic view of a locking nozzle structure for an injection molding machine according to the present application;
FIG. 2 is a schematic view of the locking nozzle of the injection molding machine according to the present application;
FIG. 3 is a schematic diagram of a cylinder structure of a locking nozzle for an injection molding machine according to the present application;
FIG. 4 is a schematic diagram showing the cooperation of a locking nozzle and a mold for an injection molding machine according to the present application;
FIG. 5 is a sequence of actions for molding a large article by the locking nozzle molding method for an injection molding machine according to the present application.
In the figure: 1. the injection front charging barrel, 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 mould, 11, a press template, 12, a hydraulic oil port, 13, a cylinder barrel, 14, a fixed seat, 15, a piston and oil cylinder rod, 16, a cylinder bottom, 17, a cooling water port, 18 and a limit switch.
Detailed Description
The technical scheme adopted by the application for achieving the aim of the application is as follows: as shown in fig. 1 and 2, the locking nozzle for the injection molding machine comprises a nozzle transition body 2, a nozzle head 3, a nozzle valve core 7, a nozzle feed cylinder 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 feed cylinder 1 before injection of the injection molding machine and forms an inclined channel with a storage channel of the feed cylinder 1 before injection, and the front part of the transition body 2 is fixedly connected with the nozzle head 3 through the nozzle feed cylinder 8; the nozzle 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 cylinder 6, so as to realize the action of the valve core 7; 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 starting position, the stroke midpoint and the end position of a piston rod on the nozzle cylinder, the three limit switches 18 are respectively an on-position limit switch, an off-position limit switch and an off-position limit switch, and the working condition of the nozzle is transmitted to the controller in a digital input mode.
The application relates to a method for forming a locking nozzle for an injection molding machine, which comprises the following steps of:
a) Starting an injection production cycle, preparing the vertical press 5 to start to mold, and pre-pressing the press template 11 along the pull rod 4;
b) After the controller scans the signal input of the press 5 for closing the die in place, the injection seat moves forward, the controller continuously gives a digital output signal to the action valve of the nozzle oil cylinder 6, the oil cylinder rod 15 moves backward to drive the valve core 7 to open, and the opening action of the nozzle 9 is performed;
c) When the valve core 7 reaches the opening end position, an opening end limit switch is activated, a signal is input to the controller, the controller continuously gives an opening signal to the action valve of the plasticizing plunger after scanning the signal, and the molten raw material starts to be pushed forward, and is injected into the die 10 after passing through the nozzle transition body 2, the charging barrel 1 and the nozzle head 3;
d) After the injection is finished, the injection piston reaches an injection end position, after receiving an injection end signal, the controller continues to give a signal to the injection action valve, maintains the working pressure of the piston to keep the pressure and starts timing, after the preset pressure keeping time is finished, the controller continues to give a digital output signal to the action valve of the nozzle oil cylinder 6, and the oil cylinder rod 15 moves forwards to drive the valve core 7 to be closed so as to perform the closing action of the nozzle 9;
e) In the closing process of the nozzle 9, when reaching the closing stroke midpoint, a Guan Zhongwei position limit switch is activated, at the moment, the closing action of the valve core 7 is stopped, the controller starts to control the vertical compression mold to compress and exhaust products, and when the pressure sensor detects that the press 5 has built up sufficient pressure, the controller continues to control the closing of the nozzle valve core 7;
f) When the valve core 7 completely closes the nozzle, a Guan Zhongwei position limit switch is activated, at the moment, the controller starts to control the plasticizing motor to drive the screw rod to store materials, and one working cycle is ended after the material storage end position is reached.
In order to solve the problem that bubbles are brought in the process of injecting the raw materials into the cavity of the die 10 to influence the final appearance of the product, the nozzle is firstly closed before the storage is set in the program, the valve core stops moving after contacting the limit switch 18 in the closing state, the pressure of the press 5 is in place, the nozzle closing signal is continuously output until the nozzle is at the final closing position, and then the storage is carried out.
In order to prevent the situation that the molten raw material pushes up 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 self-locking valve is arranged on a hydraulic oil way on the nozzle oil cylinder 6, so that the situation that the valve core 7 of the nozzle is pushed up due to the increase of the pressure of a die cavity when the nozzle is stopped is avoided.
In order to avoid the situation that the unexpected hydraulic cylinder 6 retreats in the material storage process of the nozzle valve core 7, the valve core moves backwards and leaves the final limit switch position of the switch, the normal work is influenced by the material storage action, and 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 retreating action of the nozzle valve core 7 is avoided.
In order to ensure the integrity of the cycle and to meet the initial operating conditions, a sufficient pressure flow environment is established, and the nozzle program is set to be automatically produced, when the controller scans the signal of the rising edge of the injection permission signal, the controller starts to produce the cycle from the first step of the cycle.
In order to ensure the consistency and the always of the action of the nozzle valve core 7, when the nozzle switch key is pressed in a manual operation state, the nozzle is switched, and the switching action is stopped after the button is released, so that the condition that the nozzle valve core 7 reaches the starting and the ending point after pressing the button once is avoided, and the action controllability and the control accuracy are improved.
In order to integrate the related functions of the new nozzle structure into a new model, screen elements and setting options for 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 the related parameters in the operation of the nozzle can be controlled and adjusted. Meanwhile, the display of icons or entry pictures in the action process is increased, and a work monitoring module is increased, so that an injector operator can obtain visual work feedback from a controller panel, determine the working condition according to the monitoring picture and conduct investigation of related working problems, and the predictability of the production condition and the flexibility of a production plan are improved.
When abnormal working conditions occur, the controller panel can generate corresponding alarm prompts: when the opening or closing action of the nozzle exceeds the set time, the controller alarms the nozzle opening overtime or the nozzle closing overtime; when the injection molding machine is in an automatic working state, after the time for waiting for the press to allow the injection signal exceeds 2 minutes, the controller alarms to wait for the press to allow the injection signal. In time reminds the plastic machine operators of abnormal working states, and ensures the smooth production work.
The control program and the action matched with the novel nozzle are designed, the novel nozzle has complete and reasonable working logic, the nozzle structure can be effectively combined, the action requirements in the process production steps are met, meanwhile, a plurality of edge detection devices such as limit switches are arranged, real-time working conditions are fed back to a controller panel in time, and the controllability of equipment and the working rationality are improved.
The application relates to a nozzle for an injection molding machine and a molding method thereof, which solve the problems of backflow and leakage caused by insufficient sealing in the process of large-equivalent injection 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 sealed with the main inlet gate of the die in a matching way. Through unique structural design advantage, the valve core of the nozzle is effectively opened and closed, and the valve core is used as an outlet for product exhaust in half-open, so that the problem of air holes of large products is solved.
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 cooling water jacket for cooling the nozzle oil cylinder body; the required working condition of the oil cylinder is ensured, the high temperature caused by frequent reciprocating motion is avoided, the service life and 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-described embodiments are merely illustrative of the principles of the present application, and that various changes and modifications can be made therein without departing from the scope of the application as defined in the appended claims. All other embodiments obtained by a person skilled in the art on the basis of the technical solution of the present application without making any creative effort shall fall within the protection scope of the present application based on the embodiments described in the present application.
Claims (4)
1. A molding method of a locking type nozzle for an injection molding machine is characterized in that the locking type nozzle for the injection molding machine is adopted and 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 act; 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 connection hole of the guide hole of the nozzle transition body and the nozzle material barrel, and the molten material in the material barrel flows into the nozzle material barrel through the inclined hole of the nozzle transition body before injection; the nozzle cylinder is positioned on the center line of the nozzle head, and three limit switches which can sense the corresponding positions are respectively arranged at the initial position, the stroke midpoint and the end position of a piston rod on the nozzle cylinder, so that the working condition of the nozzle is transmitted to the controller in a digital input mode;
three limit switches which can sense the corresponding positions are respectively arranged at the starting position, the stroke midpoint and the end position of a piston rod on the nozzle oil cylinder and are respectively an opening end position limit switch, a closing end position limit switch and a closing end position limit switch, when the piston rod is positioned at the closing end position limit switch, the head part of a nozzle valve core connected with the nozzle oil cylinder protrudes out of the nozzle, and the nozzle valve core is matched with a main pouring gate on a die and plays a role in sealing;
a cooling water jacket is sleeved on the nozzle oil cylinder body, and a water inlet and outlet connector is arranged on the cooling water jacket for cooling the nozzle oil cylinder body;
the method comprises the following steps:
firstly, starting an injection production period, preparing a vertical press to start to mold, and pre-pressing a press template along a pull rod;
secondly, after the controller scans the signal input of the press die in place, the injection seat moves forward, the controller continuously gives out a digital output signal to the action valve of the nozzle oil cylinder, the oil cylinder rod moves backward, the valve core is driven to open, and the opening action of the nozzle is carried out;
thirdly, when the valve core reaches an opening end position, an opening end limit switch is activated, a signal is input to a controller, the controller continuously gives an opening signal to an action valve of the plasticizing plunger after scanning the signal, and starts to push the molten raw material forwards, and injection is carried out in the die after passing through a nozzle transition body, a charging barrel and a nozzle head;
fourthly, after the injection is finished, the injection piston reaches an injection end point position, after receiving an injection end point signal, the controller continues to give a signal to the injection action valve, maintains the working pressure of the piston to keep the pressure and starts timing, after the preset pressure keeping time is finished, the controller continues to give 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 be closed, and the nozzle is closed;
fifthly, in the closing process of the nozzle, when the closing stroke midpoint is reached, a Guan Zhongwei limit switch is activated, at the moment, the closing action of the valve core is stopped, the controller starts to control the vertical pressing die to compress and exhaust products, and when the pressure sensor detects that the press has built up sufficient pressure, the controller continues to control the closing of the valve core of the nozzle;
sixthly, when the valve core completely closes the nozzle, the closing limit switch is activated, at the moment, the controller starts to control the plasticizing motor to drive the screw rod to store materials, and after the material reaches the storage end position, one working cycle is ended;
in the plasticizing process, the nozzle opening action is not detected, the controller continuously controls the material storage action to be carried out, and abnormal work caused by the backward action of the nozzle valve core is avoided;
adding picture elements and setting options for hydraulic nozzle use, hydraulic nozzle pressure flow setting, hydraulic nozzle time setting or limit switch state and nozzle switch action time limitation on a panel of an injection molding machine controller, ensuring that the action state can be managed through the controller, simultaneously adding icon or entry picture display during action, adding a work monitoring module, enabling an injector operator to obtain visual work feedback from the controller panel, determining working conditions according to the monitoring picture, and conducting investigation of related working problems;
the controller panel sets an alarm prompt: when the opening or closing action of the nozzle exceeds the set time, the controller alarms the nozzle opening overtime or the nozzle closing overtime; when the injection molding machine is in an automatic working state, after the time for waiting for the press to allow the injection signal exceeds 2 minutes, the controller alarms to wait for the press to allow the injection signal.
2. The molding method of a lock nozzle for an injection molding machine according to claim 1, wherein: and continuously outputting a nozzle closing signal in the material storage process.
3. The molding method of a lock nozzle for an injection molding machine according to claim 1, wherein: the hydraulic oil way on the nozzle cylinder is provided with a hydraulic self-locking valve.
4. The molding method of a lock nozzle for an injection molding machine according to claim 1, wherein: in the manual operation state, when the nozzle switch key is pressed, the nozzle performs the switch action, and when the button is released, the switch action is stopped.
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 |
|---|---|
| CN115027002A CN115027002A (en) | 2022-09-09 |
| CN115027002B true CN115027002B (en) | 2023-11-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210765582.7A Active CN115027002B (en) | 2022-06-30 | 2022-06-30 | Locking type nozzle for injection molding machine and molding method |
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| CN115027002A (en) | 2022-09-09 |
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