WO2000005052A1

WO2000005052A1 - The apparatus of injection molding rubber and plastic and the method thereof

Info

Publication number: WO2000005052A1
Application number: PCT/CN1999/000099
Authority: WO
Inventors: Baiyuan Lü; Jingxin Li; Pengzhen Liu; Dianrui Zong
Original assignee: Lue Baiyuan; Jingxin Li; Pengzhen Liu; Dianrui Zong
Priority date: 1998-07-23
Filing date: 1999-07-22
Publication date: 2000-02-03
Also published as: DE19983383T1; AU4895199A; CN1100657C; CN1310664A; DE19983383B4

Abstract

The present invention discloses an apparatus of injection molding rubber and plastic and the method thereof. The apparatus comprises a barrel (1), a movable screw (2) mounted in said barrel (1), a die (4) connected with the front of the barrel (1) and a conical screw head (3) mounted in front of the screw. In the die, there is an axial conical hole fitting the conical screw head, said conical screw head mounting in the conical hole to form a conical annular sprue (15). There is a nozzle (5) connected with the mold inlet in front of the die, said annular sprue connecting said barrel and the nozzle, separately. According to the injection molding method of the present invention, the feeded material is plasticized by the action of the rotating screw, at the same time, the plasticized material continues entering said annular sprue by the thrust of the rotating screw, then entering the nozzle and from which injecting into the cavity of the mold.

Description

Injection molding device for rubber and plastic machinery

And injection molding method

Technical field

The invention relates to an injection molding device and an injection molding method for a rubber, plastic or a modified material thereof. Background technique

At present, rubber, plastic and modified material injection machines used in domestic Xibu generally use a reciprocating screw injection molding device, which adds materials to the screw pestle-barrel system, and the materials are obtained by the function of the screw pestle-barrel system For plasticizing, the screw pushes the plasticized material continuously to the inner cavity of the machine head through rotation, and moves backwards under the action of back pressure in the inner cavity of the machine head. When a predetermined volume of material has accumulated in the inner cavity of the machine head, the axial injection device advances the screw to inject the material accumulated in the inner space of the machine head into the mold. The axial injection device of the injection machine requires a large driving force, consumes a large amount of energy, has a complicated structure, is difficult to maintain, and is difficult to injection-mold large-scale products. Object of the invention

The object of the present invention is to provide an improved injection molding device and method for rubber, plastic or modified materials thereof, which has a simple structure, low cost and energy consumption, and is easy to realize injection molding of high-viscosity large products. Technical solutions

To achieve the above object, the present invention provides an injection molding device for rubber and plastic machinery, which includes a barrel, a screw rotatably installed in the barrel, and a head connected to the front end of the barrel. A die is provided with a conical screw pestle head at the front end of the screw, the die of the machine head is formed with an axially tapered hole matching the shape of the screw-shaped screw head, and the tapered screw head is arranged in the tapered hole China and Israel form a conical annular flow channel between them. The front end of the die head is provided with a nozzle that can be connected to the material injection port of the mold. The annular flow channel communicates with the barrel and the nozzle, respectively, so that Material Cavity.

Preferably, a pressure measuring sensor is provided on the flow path of the material to detect the injection pressure of the material, and the injection molding device stops when the injection pressure reaches a certain set value of the pressure measuring sensor.

Preferably, the feeding device of the injection molding device is composed of the screw pestle and a feeding roller extending in the material conveying direction. The feeding roller is formed with a thread matching with the screw on the screw, and the thread on the feeding roller is formed. Forms a non-tight mesh with the screw on the screw. When the feeding device is running, the feeding roller and the screw rotate facing each other.

Preferably, a heating-cooling water channel is provided in the die die structure to control the temperature of the material passing through the flow channel, and a temperature measurement sensor is provided on the flow channel to monitor the injection temperature of the material.

Preferably, the conical screw head is a conical screw head, and the conical hole is a conical hole. According to another aspect of the present invention, an injection molding method for rubber or plastic machinery is provided. The injection molding device for rubber or plastic machinery includes a barrel, and a screw rotatably installed in the barrel. A die opening die connected to the front end of the barrel, the method includes the following steps: a cone screw head is installed on the front end of the screw, and a shape and a shape of a conical screw pestle head are formed on the die opening die. A matching axial tapered hole, the tapered screw head is fitted in the tapered hole to form a tapered annular flow channel therebetween;

A nozzle which can be connected to the material injection port of the mold is installed at the front end of the die head, so that the annular flow channel communicates with the barrel and the nozzle, respectively;

When the injection molding device is running, the screw is rotated to plasticize the material, and at the same time, the plasticized material is pushed into the annular flow channel by using the thrust generated by the screw rotation, and the plasticized material is injected into the mold cavity by using a nozzle.

Preferably, the conical screw head is a conical screw head, and the conical hole is a round cymbal hole. Beneficial effect

By using the injection molding device and molding method of the present invention, the rubber entering the screw-barrel system, Plastic or its modified material is plasticized under the action of a rotating screw, and the plasticized material enters through the annular flow channel between the tapered hole of the die mouth and the tapered screw pestle under the action of the rotating screw thrust. The nozzle is injected into the mold cavity by the nozzle. Therefore, there is no need to configure an axial injection device, and the structure is simple, the volume is small, energy is saved, and the equipment cost is low. At the same time, the product quality can be improved, the product cost can be reduced, and the injection molding of large and high-viscosity products can be realized. Drawing description

The present invention will be further described in detail with reference to the accompanying drawings and embodiments, in which:

FIG. 1 is a schematic structural diagram of a rubber and plastic injection molding device according to the present invention, and a front end of a nozzle is equipped with a molding die;

2 is a detailed view of a rubber and plastic injection molding device according to the present invention;

FIG. 3 is a general structural layout diagram of a rubber and plastic machine equipped with an injection molding device of the present invention. Preferred embodiment for realizing the invention

As shown in FIG. 1 and FIG. 2, the injection molding device for rubber, plastic or modified material of the present invention includes a barrel 1, a screw pestle 2 rotatably installed in the barrel 1, and a screw 2 and a barrel 1 constitute Plasticizing and injection systems. A nozzle die 4 is connected to the front end of the barrel 1, and a nozzle 5 is installed at the front end of the nozzle die, and the front end of the nozzle can be matched with a material injection port of a mold 7. The front end of the screw pestle 2 is provided with a tapered screw head 3, and the die mouth die 4 is formed with an axially tapered hole. The conical screw head is fitted in an axially tapered hole, the conical hole matches the shape of the conical screw head 3, and a conical annular flow channel 15 is formed therebetween. The conical annular flow passage communicates with the barrel 1 at the rear end, and communicates with the nozzle 5 at the front end, so that the material from the barrel is fed into the nozzle 5 through the conical annular flow passage by the rotation of the screw 2, the nozzle 5Inject the material into the mold cavity of the corresponding mold.

A heating-cooling water channel 14 can be set in the die die structure to control the temperature of the material passing through the flow channel. In addition, a temperature measurement sensor can be set on the flow channel to monitor the injection temperature of the material, so that The material is injected into the mold cavity at the desired temperature. In addition, a pressure measuring sensor 6 is provided on the flow channel to monitor the injection pressure of the material. When the injection pressure detected by the pressure measuring sensor 6 reaches a predetermined pressure value (the predetermined value indicates that the mold cavity has been injected) (Predetermined amount of material), the injection molding device is stopped. In specific use, the diameter of the nozzle can be selected to control the speed at which the material is injected into the mold cavity. As shown in FIG. 3, the feeding device 8 at the rear of the injection molding device is composed of a screw 2 and a feeding roller (not shown) extending in the material conveying direction. The feeding roller is formed with a thread on the screw 2 Match the mating threads. The threads on the feed roller form a non-tight mesh with the threads on the screw 2. When the feeding device is working, the feeding roller and the screw pestle 2 rotate opposite to each other, and the screw on the feeding roller generates spiral pressure when rotating, forcing the material fed from the feeding port to pass through the gap between the two threads and on the screw 2 Into the barrel under the action of the thread.

The operation of the mechanical injection molding device for the rubber, plastic, or modified material of the present invention having the above structure will be described below with reference to FIG.

After the forming mold is placed in place, the mold locking device 13 fixes the forming mold 7 in place under the action of the mold locking device driving system 12. At this time, the material injection port of the molding die is aligned axially with the nozzle of the injection molding device. Subsequently, the axial displacement device 10 of the injection molding device is started, and the injection molding device is driven to move along the axial displacement guide 1 1 toward the mold until the nozzle of the molding device and the material injection port of the mold are engaged. After the injection molding device starts to run, rubber, plastic or its modified material is fed into the screw-cylinder system through the feeding port of the feeding device 8, and the fed material is plasticized by the screw rotating at a certain speed. The plasticized material continuously enters the flow channel formed between the die-shaped hole at the mouth of the machine head and the conical screw head under the action of the rotary screw Xuan thrust, then enters the nozzle, and is injected into the mold cavity by the nozzle. During the injection molding process, the temperature of the material flowing through the runner can be controlled so that the material is injected into the mold cavity at the expected temperature and speed. When the injection pressure detected by the load cell 6 reaches a predetermined pressure value, the injection molding device stops operating, and at the same time moves axially in a direction away from the mold to disengage it from the mold. After the product in the mold cavity is cooled or cooled, the mold is opened to take out the product, then the mold is closed and fixed in place, and then the injection device is moved axially toward the mold so that the nozzle is again aligned with the material injection port of the mold Pick up. The injection molding device can then be activated to repeat the above process.

The present invention has been described in conjunction with the embodiments, but those skilled in the art should understand that various modifications can be made to the present invention without departing from the spirit and scope of the present invention. For example, the axially tapered hole of the conical screw head and the die of the machine head is not limited to the conical shape shown in the figure, but may be a polygonal conical shape.

Claims

Rights request

1. An injection molding device for rubber and plastic machinery, comprising a barrel (1), a screw (2) rotatably mounted in the barrel (1), and a front end of the barrel (1) The connected die head die (4) is characterized in that:

The front end of the screw is provided with a conical screw head (3), the die of the machine head is formed with an axially tapered hole matching the shape of the conical screw head, and the conical screw head is fitted in the conical hole A cone-shaped annular flow channel (15) is formed therebetween, and a nozzle (5) which can be connected to the material injection port of the mold is arranged at the front end of the die head, and the annular flow channel is respectively connected with the barrel and the nozzle. Communication, so that the plasticized material continuously enters the annular flow channel under the action of the rotating screw thrust and is injected into the mold cavity through the nozzle.

2. The injection molding device according to claim 1, wherein a pressure measuring sensor (6) is provided on the flow path of the material to detect the injection pressure of the material, and the injection pressure reaches a certain setting of the pressure measuring sensor. When the value is set, the injection molding device stops.

3. The injection molding device according to claim 1, characterized in that the feeding device (8) of the injection molding device is composed of the screw (2) and a feeding roller extending in a material conveying direction, and the feeding roller Threads matching the threads on the screw pestle are formed on the thread. The threads on the feeding roller and the threads on the screw form a non-tight mesh. When the feeding device is running, the feeding roller and the screw rotate opposite to each other.

4. The injection molding device according to claim 1, wherein a heating-cooling water channel (14) is provided in the die die structure to control the temperature of the material passing through the flow channel, and is on the flow channel. A temperature sensor is set up to monitor the injection temperature of the material.

5. The injection molding device according to any one of claims 1 to 4, wherein the conical screw head (3) is a conical screw pestle head, and the conical hole is a conical hole.

6. The injection molding device according to any one of claims 1 to 4, wherein:

7. An injection molding method for rubber and plastic machinery, the injection molding device for rubber and plastic machinery comprising a barrel (1), a screw (2) rotatably installed in the barrel (1) ), A die head die (4) connected to the front end of the barrel (1), the method includes the following steps:

A tapered screw head (3) is installed at the front end of the screw, and an axially tapered hole having a shape matching the shape of the tapered screw head is formed on the die of the machine head, and the tapered screw head is fitted in A tapered hole to form a tapered annular flow channel (15) between them; A nozzle (5) which can be connected to the material injection port of the mold is installed at the front end of the die head to make the annular flow channel communicate with the barrel and the nozzle, respectively;

When the injection molding device is running, the screw pestle is rotated to plasticize the material, and at the same time, the plasticized material is pushed into the annular flow channel by using the thrust generated by the screw pestle rotation, and the plasticized material is injected into the mold using a nozzle. Cavity.

8. The injection molding method according to claim 7, wherein a pressure measuring sensor (6) is provided on the flow path of the material to detect the injection pressure of the material, and the injection pressure reaches a certain setting of the pressure measuring sensor. When the value is set, the injection molding device stops.

9. The injection molding device according to claim 7, wherein a heating-cooling water channel (14) is provided in the die die structure to control the temperature of the material passing through the flow channel, and is on the flow channel. A temperature sensor is set up to monitor the injection temperature of the material.

The injection molding method according to any one of claims 7 to 9, wherein the conical screw head (3) is a conical screw head, and the conical hole is a conical hole.

The injection molding method according to any one of claims 7 to 9, wherein the cone shape is a polygonal cone shape or a cone shape having an axial cross-sectional profile that is parabolic or approximately parabolic.