A thermosetting plastic ultrasonic molding clamping device

Abstract

The present invention discloses a thermosetting plastic ultrasonic molding clamping device, which mainly includes a movable mold plate, a fixed mold plate, a complete mold set, injection molding accessories, an ultrasonic generator, a connecting cable, a transducer, an amplifier ejector rod and a sealing component, etc. Several transducers are centrally symmetrically distributed on the ejector plate and connected to the ejector plate with a threaded connector. The amplifier ejector rod passes through the reserved position of the movable mold and participates in forming the closed surface of the product mold cavity. The spring pressure block in the sealing component in the movable mold plate is tightly attached to the amplifier ejector rod under the action of the spring elastic force to play a sealing role. The present invention proposes a structural design of the amplifier ejector rod, combines the traditional amplifier rod and the ejector rod of the injection molding machine, and introduces the ultrasonic system into the ejection mechanism of the thermosetting plastic injection molding machine. The traditional curing method of heating in the mold of the thermosetting plastic injection molding machine is abandoned, and ultrasonic heating is used instead, which effectively simplifies the design and manufacture of the overall mechanical mold, saves energy, and improves production efficiency and product quality.

Description

Technical Field

[0001] The invention relates to a molding clamping device with an ultrasonic heating device for a thermosetting plastic injection molding machine, belonging to the field of polymer material molding machinery. Background Art

[0002] With the increasing number and application of plastic products, thermosetting plastics have achieved new development, and the thermosetting plastic injection molding process has become a high-efficiency molding process characterized by high speed, automation and large-scale molding.

[0003] Due to the special properties of thermosetting plastics, their molding process is significantly different from that of thermoplastics. Among the three stages of thermosetting plastic injection molding, the curing stage is related to the molding quality of the product and is a direct reflection of the quality of the injection molding process.

[0004] Traditional thermosetting plastic injection molding machines need to heat the mold during the curing stage of the molding cycle to meet the temperature requirements for cross-linking and curing of thermosetting plastics. Therefore, additional equipment needs to be added, which increases the difficulty of mold design and increases production costs.

[0005] The patent (patent number: 90212357.2) mentions a heating device for thermosetting plastic molding molds. The device uses a fuel heating furnace to replace the traditional electric heating method, which has a wider adaptability. However, the design and installation of the device are complicated and do not directly improve the disadvantages of the conventional curing method through external heating equipment.

[0006] Ultrasonic plasticizing is an emerging molding technology in plastic molding technology. By utilizing the characteristics of ultrasonic transmission in the medium, when ultrasonic waves are transmitted to plastic particles, they cause violent relative slip and local deformation between particles and cavitation effect between plastic particles, causing the internal temperature of the plastic to rise sharply in a short time, thus achieving heating of the plastic and completing plasticizing and molding of the plastic, and no external heat source is required in the process. Summary of the invention

[0007] The present invention provides a molding clamping device with an ultrasonic heating device, which is mainly used for thermosetting plastic injection molding machines, simplifies the mold design of traditional thermosetting plastic injection molding machines, saves costs, improves product curing effect, and obtains higher quality products.

[0008] The solution to achieve the above purpose is a thermosetting plastic ultrasonic molding clamping device, which mainly includes a movable mold plate, a fixed mold plate, a complete mold set, injection molding accessories and an ejection assembly, forming a complete mold clamping and ejection system of an injection molding machine. The complete mold set includes a movable mold, a fixed mold and a guide rod, etc.; the injection molding accessories include a positioning ring and a main pouring sleeve, etc.; the ejection assembly includes an ejection cylinder, an ejection plate and an ejection rod.

[0009] The invention discloses a thermosetting plastic ultrasonic molding clamping device, which also includes an ultrasonic generator, a connecting cable, a transducer, an amplifying ejector rod and a sealing component, wherein the transducer is composed of a transducer housing, an electrode sheet, an electrode wire and a pre-vibration rod.

[0010] The invention discloses a thermosetting plastic ultrasonic molding clamping device, wherein the components are connected in the following manner: a plurality of transducers are centrally symmetrically distributed on an ejector plate and connected to the ejector plate by a threaded connector; an amplifying ejector rod and the transducer are threadedly connected and ensured to contact with a pre-vibration rod in the transducer; the ejector plate is placed in a reserved space of an injection molding dynamic mold plate, connected to an ejector piston, and an ejection oil cylinder provides ejection power; the amplifying ejector rod passes through a reserved position of a dynamic mold and participates in forming a closed surface of a mold cavity of a product; a spring pressure block in a sealing assembly in the dynamic mold plate is tightly attached to the amplifying ejector rod under the action of a spring elastic force, and plays a sealing role; an electrode sheet is connected to an electrode wire, and positive and negative intervals are arranged in the transducer; a cable wrapped around the electrode wire is led out from the transducer, and connected to an external ultrasonic generator through a reserved position on the ejector plate and the dynamic mold plate; and the external ultrasonic generator is powered.

[0011] The present invention discloses a thermosetting plastic ultrasonic molding clamping device, wherein the sealing component is composed of a sealing component housing, a spring, a spring pressure block and a cover plate, the sealing component housing is placed in a reserved position of a movable mold, the spring and the spring pressure block are placed in the sealing component housing, the cover plate is connected to the spring pressure block by a dovetail groove, and is connected to the sealing component housing and the movable mold by a flat head screw, and the movable mold reserves a groove position that cooperates with the cover plate to ensure that the surface of the movable mold is flat after assembly. In the injection stage of the thermosetting plastic injection molding cycle, the amplifying ejector rod participates in forming a pre-formed product cavity and leaves a certain expansion space for the product. Subsequently, the amplifying ejector rod is further pushed forward to reach a predetermined position to form the shape of the final product and enter the pressure-maintaining and shrinkage-compensating stage of the product. Under the action of the spring elastic force, the spring pressure block in the sealing component always keeps in contact with the amplifying ejector rod, thereby ensuring the airtightness of the product cavity. In the process of the amplifying ejector rod pushing forward, the sealing component plays a role in closing the cavity, which is beneficial to shrinkage compensation of the product.

[0012] The present invention discloses a thermosetting plastic ultrasonic molding clamping device, which is divided into two working stages. In the injection stage of the thermosetting plastic injection molding cycle, the amplifying ejector rod participates in forming a pre-formed product cavity and leaves a certain expansion space for the product. Subsequently, the amplifying ejector rod is further pushed forward to reach a predetermined position to form the shape of the final product and enter the pressure-maintaining and shrinkage-compensating stage of the product. In this stage, the spring pressure block in the sealing component is always in contact with the amplifying ejector rod under the action of the spring elastic force, ensuring the airtightness of the product cavity. In the process of the amplifying ejector rod being pushed forward, the sealing component plays the role of closing the cavity, which is beneficial to the shrinkage-compensating of the product.

[0013] The ultrasonic molding clamping device for thermosetting plastics of the present invention has the following working process in the pressure holding stage within the thermosetting plastic injection molding cycle: the ultrasonic generator is powered on, and the electrode sheet generates high-frequency mechanical vibration, that is, ultrasonic waves; low-amplitude ultrasonic waves are transmitted to the amplifying ejector rod through the pre-vibration rod for further amplification, and then the ultrasonic waves are directly transmitted to the thermosetting plastic product in the pressure holding stage through the amplifying ejector rod; the thermosetting plastic product is heated up under the action of the ultrasonic wave, reaches the curing temperature and is cured; then, driven by the ejection oil cylinder, the amplifying ejector rod ejects the cured plastic product, completing a production cycle.

[0014] The beneficial effects of the present invention are as follows: a structural design of an amplifying ejector rod is proposed, a traditional amplifying rod and an ejector rod of an injection molding machine are combined together, and an ultrasonic system is introduced into the ejector mechanism of a thermosetting plastic injection molding machine.

[0015] The traditional thermosetting plastic injection molding machine mold heating curing method is abandoned and ultrasonic heating is used instead, which effectively simplifies the design and manufacturing of the overall mechanical mold, saves energy, and improves production efficiency and product quality.

[0016] Using an external ultrasonic generator is easy to implement and low cost compared to traditional mold heating systems.

[0017] By using a detachable amplifying ejector rod, the amplifying ejector rod with different amplification ratios can be replaced according to different processed materials, thus expanding the material range applicable to the injection molding machine.

[0018] The use of several detachable amplifying ejector rods arranged symmetrically at the center can effectively adapt to products of different sizes and shapes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a simplified assembly diagram of a thermosetting plastic ultrasonic molding clamping device.

[0020] Figure 2 The present invention provides a schematic diagram of an ultrasonic heating and ejection system in a thermosetting plastic ultrasonic molding clamping device.

[0021] Figure 3 The present invention shows the working process of a thermosetting plastic ultrasonic molding clamping device during the injection stage of a thermosetting plastic injection molding cycle, wherein a is the initial position of each component, and b is the position of each component during pressure-maintaining and shrinkage-compensating.

[0022] Figure 4 The present invention is a simplified structural diagram of a sealing component in a thermosetting plastic ultrasonic molding clamping device.

[0023] In the figure: 1. ejector cylinder, 2. ejector plate, 3. movable platen, 4. sealing assembly, 5. movable mold, 6. fixed mold, 7. fixed mold, 8. positioning ring, 9. main pouring sleeve, 10. guide rod, 11. product cavity, 12. amplifier ejector rod, 13. transducer, 14. cable, 15. ultrasonic generator, 16. electrode wire, 17. electrode sheet, 18. pre-vibration rod, 19. transducer housing, 20. sealing assembly housing, 21. spring, 22. spring pressure block, 23. cover plate. DETAILED DESCRIPTION

[0024] The present invention provides an ejection mechanism for a thermosetting plastic ultrasonic molding clamping device, such as Figure 2 As shown; during operation, it needs to be used in conjunction with the movable platen 3, fixed platen 7, complete mold set (including movable mold 5, fixed mold 6, guide rod 10, etc.) and injection molding accessories (including positioning ring 7, main pouring sleeve 8, etc.) in the mold clamping assembly of the injection molding machine, as well as the ejection cylinder 1 and ejection plate 2 in the ejection assembly to form a complete mold clamping and ejection system of the injection molding machine, as shown Figure 1 shown.

[0025] The ultrasonic molding clamping device for thermosetting plastics of the present invention further comprises: an ultrasonic generator 15, a connecting cable 14, a transducer 13, an amplifying ejector rod 12, etc., wherein the transducer 13 is composed of an electrode wire 16, an electrode sheet 17, a pre-vibration rod 18 and a transducer housing 19, etc.

[0026] The specific connection mode of each component of the mechanism of the present invention is as follows: a plurality of transducers 13 are centrally symmetrically distributed on the ejector plate 2 and are connected to the ejector plate 2 by threads; the amplifying ejector rod 12 and the transducer 13 are connected by threads and are ensured to be in contact with the pre-vibration rod 18 in the transducer 13; the ejector plate 2 is placed in the reserved space of the injection molding dynamic mold plate 3, connected to the ejector piston, and the ejection power is provided by the ejection cylinder 1; the amplifying ejector rod 12 passes through the reserved position of the dynamic mold 5 and participates in forming the closed surface of the product mold cavity 11; the sealing assembly 4 is composed of a sealing assembly housing 20, a spring 21, a spring pressure block 22, and a cover plate 23, as shown in FIG. Figure 4 As shown, the sealing component housing 20 is placed in the reserved position of the movable mold 5, the spring 21 and the spring pressure block 22 are placed in the sealing component housing 20, the cover plate 23 is connected to the spring pressure block 22 by a dovetail groove, and is connected to the sealing component housing 20 and the movable mold 5 by a flat head screw, and the movable mold 5 reserves a groove position that cooperates with the cover plate 23 to ensure that the surface of the movable mold 5 is flat after assembly; the electrode sheet 17 is connected to the electrode wire 16, and the positive and negative intervals are arranged in the transducer 13; the connecting cable 14 wrapped with the electrode wire 16 is led out from the transducer 13, and is connected to the external ultrasonic generator 15 through the ejection plate 2 and the reserved position on the movable mold plate 3; the external ultrasonic generator 15 needs to be powered to work.

[0027] The device of the present invention is divided into two working stages. In the injection stage of the thermosetting plastic injection molding cycle, the amplifying ejector rod 12 participates in forming a pre-formed product cavity 11 and leaves a certain expansion space for the product. Subsequently, the amplifying ejector rod 12 is further pushed forward to reach a predetermined position to form the shape of the final product and enter the product pressure-maintaining and shrinkage-compensating stage. In this stage, the spring pressure block 22 in the sealing component 4 is always in contact with the amplifying ejector rod 12 under the action of the elastic force of the spring 21, ensuring the airtightness of the product cavity. In the process of pushing the amplifying ejector rod 12 forward, due to the special shape structure, the sealing component 4 also plays the role of closing the cavity, which is beneficial to the shrinkage compensation of the product. Figure 3 shown.

[0028] In the system of the present invention, during the pressure holding stage of the injection molding cycle, the ultrasonic generator 15 is powered on, and the cable 14 transmits electricity to the electrode sheet 17, and the electrode sheet 17 generates high-frequency mechanical vibration, that is, ultrasonic waves; low-amplitude ultrasonic waves are transmitted to the amplifying ejector rod 12 through the pre-vibration rod 18 for further amplification, and then the ultrasonic waves are transmitted to the thermosetting plastic product in the pressure holding stage; the thermosetting plastic product is heated up under the action of ultrasonic waves, reaches the curing temperature and is cured and formed; then, driven by the ejection cylinder 1, the amplifying ejector rod 12 ejects the cured product, completing a production cycle.

[0029] like Figure 1 and Figure 3 As shown, the amplifying ejector rod 12 is composed of four sections, the first section has the largest diameter, and this section is connected to the pre-vibration rod 18, and the maximum diameters of the other sections decrease in sequence, the second section passes through the movable mold plate 3, the third section passes through the movable mold 5, the front end of the fourth section is an inverted cone, the fourth section passes through the sealing assembly, and the end plane of the fourth section contacts the material in the product cavity. The amplifying ejector rod 12 has the dual functions of transmitting ultrasonic energy and ejecting the product.

[0030] The above is the specific equipment and process of the present invention, which is explained with the help of the figures. However, the present invention is not limited to the specific equipment and process described above. Any modification or replacement of the relevant equipment based on the above, and any partial adjustment of the relevant process based on the above, as long as it is within the scope of the spirit of the present invention, belongs to the present invention.

Claims

1. A thermosetting plastic ultrasonic molding clamping device, mainly including a movable mold plate, a fixed mold plate, a complete mold set, injection molding accessories and an ejection assembly, forming a complete mold clamping and ejection system of an injection molding machine, wherein the complete mold set includes a movable mold, a fixed mold and a guide rod; the injection molding accessories include a positioning ring and a main pouring sleeve; the ejection assembly includes an ejection cylinder, an ejection plate and an ejection rod; the characteristics are: It also includes an ultrasonic generator, a connecting cable, a transducer, an amplifying ejector rod and a sealing component, wherein the transducer is mainly composed of a transducer housing, an electrode sheet, an electrode wire and a pre-vibration rod; several transducers are centrally symmetrically distributed on the ejector plate and connected to the ejector plate with a threaded connector, the amplifying ejector rod and the transducer are threadedly connected and ensure contact with the pre-vibration rod in the transducer; the ejector plate is placed in the reserved space of the injection molding dynamic mold plate, connected to the ejection piston, and the ejection power is provided by the ejection cylinder; the amplifying ejector rod passes through the reserved position of the dynamic mold and participates in forming the closed surface of the product mold cavity, and the spring pressure block in the sealing component in the dynamic mold plate is tightly attached to the amplifying ejector rod under the action of the spring elastic force to play a sealing role; the electrode sheet is connected to the electrode wire, and the positive and negative intervals are arranged in the transducer; the electrode wire is wrapped The cable is led out from the transducer and connected to the external ultrasonic generator through the ejector plate and the reserved position on the movable template; the external ultrasonic generator is powered; in the injection stage of the thermosetting plastic injection molding cycle, the amplifying ejector rod participates in forming a pre-formed product cavity and leaves a certain expansion space for the product. Subsequently, the amplifying ejector rod is further pushed forward to reach the predetermined position to form the shape of the final product and enter the pressure holding and shrinkage compensation stage of the product; the amplifying ejector rod is composed of four sections, the first section has the largest diameter and is connected to the pre-vibration rod, and the maximum diameters of the other sections decrease in sequence, the second section passes through the movable template, the third section passes through the movable mold, the front end of the fourth section is an inverted cone, the fourth section passes through the sealing assembly, and the end plane of the fourth section contacts the material in the product cavity.

2. A thermosetting plastic ultrasonic molding clamping device according to claim 1, characterized in that: The sealing assembly consists of a sealing assembly housing, a spring, a spring pressure block and a cover plate. The sealing assembly housing is placed in a reserved position of the movable mold. The spring and the spring pressure block are placed in the sealing assembly housing. The cover plate is connected to the spring pressure block by a dovetail groove, and is connected to the sealing assembly housing and the movable mold by a flat head screw. The movable mold reserves a groove position that matches the cover plate to ensure that the surface of the movable mold is flat after assembly.

3. A thermosetting plastic ultrasonic molding clamping device according to claim 1, characterized in that: The spring pressure block in the sealing assembly is always in contact with the amplifying ejector rod under the action of the spring elastic force, ensuring the airtightness of the product cavity. In the process of pushing the amplifying ejector rod forward, the sealing assembly plays the role of closing the cavity, which is beneficial to the shrinkage compensation of the product.

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