Injection molding device for water heating pipe fitting production

Abstract

The invention discloses a water heating pipe fitting production injection molding device, and relates to the technical field of injection molding devices. The injection mold comprises a mold system and a heating injection molding system, wherein the mold system comprises a fixed mold and a movable mold which are matched with each other; an air cooling runner is arranged in each of the fixed mold and the movable mold; the air cold runner is communicated with the heat storage device; a feeding hopper is connected to the heating injection molding system, a plurality of air inlet holes are formed in the peripheral side wall of the bottom of the feeding hopper, an air inlet cover is arranged on the outer side of the feeding hopper, and an air inlet cavity is formed between the air inlet cover and the feeding hopper and communicates with the heat storage device. The air inlet cover and the air inlet holes are arranged on the peripheral side wall of the bottom of the feeding hopper, meanwhile, the heat storage device is arranged to recycle waste heat generated when the mold system is cooled, the heat storage device is used for heating the air inlet cover, and high-temperature air is supplied to the bottom of the feeding hopper; and the high-temperature gas is used for drying the plastic particles stored in the feeding hopper.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molding devices, and in particular relates to an injection molding device for producing water heating pipe fittings. Background Art

[0002] Injection molding, also known as injection molding, is a molding method that combines injection and molding. Its advantages include high production speed, high efficiency, automated operation, a wide variety of designs and colors, shapes ranging from simple to complex, and sizes ranging from large to small. Furthermore, it produces precise product dimensions, is easily updated, and can produce complex shapes. Injection molding is suitable for mass production and the molding of complex products.

[0003] Plumbing fittings such as elbows, tees and crosses are processed and formed by injection molding machines during production. When injecting the material, the raw materials may not be dried well and the moisture content may be too high, causing a large amount of water to enter the barrel and form water vapor bubbles, thereby affecting the yield rate after processing and production. Summary of the Invention

[0004] The object of the present invention is to provide an injection molding device for the production of plumbing pipe fittings, by arranging an air intake hood and air intake holes on the side walls around the bottom of the feed hopper, and at the same time arranging a heat storage device to recover the waste heat during the cooling of the mold system, and heating the air entering the air intake hood through the heat storage device, so as to supply high-temperature gas to the bottom of the feed hopper, so as to utilize the high-temperature gas to dry the plastic particles stored in the feed hopper, thereby solving the problems raised by the existing background technology.

[0005] To solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention relates to an injection molding device for producing water heating pipe fittings, comprising a mold system and a heated injection molding system, wherein the mold system comprises a fixed mold and a movable mold that cooperate with each other; the heated injection molding system comprises a nozzle for injecting completely molten plastic material into the mold system, the outer peripheral side of the nozzle is provided with an annular heating cavity, and the interiors of the fixed mold and the movable mold are both provided with an air cold runner; the device also comprises a heat storage device provided with at least two inlets and at least two outlets, one of the inlets is connected to the air cold runner, the air cold runner is connected to a humidifying module A, and the humidifying module A is connected to an air pump A; the other inlet is connected to an air pump B through a humidifying module B, the air inlet end of the air pump B is connected to the air outlet end of the annular heating cavity, and the air inlet end of the annular heating cavity is connected to an outlet of the heat storage device; a feed hopper is connected to the heated injection molding system, a plurality of air inlet holes are provided on the bottom peripheral side wall of the feed hopper, an air inlet hood is provided on the outside of the feed hopper, and an air inlet cavity is formed between the air inlet hood and the feed hopper.

[0006] Furthermore, the heating injection molding system further includes an injection tube connected to the fixed mold, the nozzle is connected to the discharge end of the injection tube, and a check ring is further provided inside the discharge end of the injection tube.

[0007] Furthermore, a plurality of layers of air-permeable partitions are provided in the heat storage device between the inlet and the outlet, and a plurality of heat storage chambers are formed by dividing the plurality of the air-permeable partitions; any of the heat storage chambers is filled with a heat storage medium; the gas entering from the inlet passes through the plurality of heat storage chambers in sequence and is discharged from the outlet.

[0008] Furthermore, the heat storage medium is alumina ceramic balls with a diameter of 5-8 mm and a specific surface area of ​​≥300 m² / g; the porosity of the breathable baffles is 40%-60%, and the distance between two adjacent breathable baffles is 3-5 times the diameter of the heat storage medium.

[0009] Furthermore, valves are provided on both the inlet and the outlet.

[0010] Furthermore, it also includes a frame, and the mold system and the heating injection molding system are both installed on the frame; a fence is set on the upper surface of the frame located on the side of the mold system; it also includes a U-shaped protective cover assembled on the fence, and the top of the U-shaped protective cover is provided with heat dissipation holes; the inner wall of the fence is provided with a driving structure whose end is connected to the movable mold.

[0011] Furthermore, the humidification module A and the humidification module B each include a chamber body, and an atomizing nozzle is installed inside the chamber body.

[0012] Furthermore, a drying component is provided between the annular heating chamber and the air pump B; the drying component includes two independent drying chambers, and also includes a three-way valve A and a three-way valve B, and the drying chambers are provided with heating coils and filled with water-absorbing drying particles; the air inlet of the three-way valve A is connected to the annular heating chamber, and the two air outlets of the three-way valve A are respectively connected to the heating coils; the air outlet end of the heating coil located in one of the drying chambers is connected to the other drying chamber; the two air inlets of the three-way valve B are respectively connected to the two drying chambers, and the air outlet is connected to the air pump B.

[0013] Furthermore, the drying chamber includes end plates arranged opposite to each other, and a tube body with an opening on one side wall is connected between the two end plates; it also includes two shells with arc-shaped cross-sections, the two shells are in sealed contact with each other, and the inner wall surfaces at both ends of the shells are in sealed contact with the peripheral side walls of the end plates; protrusions are provided on both sides of the shells, and the telescopic module is connected between the protrusions of the two shells.

[0014] Furthermore, the air inlet cavity is connected to a drying module that is the same as the drying component through an air pump C, and the drying module is connected to an outlet of the heat storage device.

[0015] The present invention has the following beneficial effects: The present invention provides an air intake hood and air intake holes on the side walls of the bottom of the feed hopper, and at the same time provides a heat storage device to recover the waste heat when the mold system is cooled. The heat storage device heats the air entering the air intake hood, thereby supplying high-temperature gas to the bottom of the feed hopper and utilizing the high-temperature gas to dry the plastic particles stored in the feed hopper.

[0016] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 Schematic diagram of the structure of the injection molding device of the present invention; Figure 2 for Figure 1 The main view; Figure 3 This is a schematic structural diagram of the heat storage device of the present invention; Figure 4 This is a schematic structural diagram of the drying component of the present invention; Figure 5 This is a schematic diagram of the coordination structure of the drying chamber and the housing of the present invention; In the accompanying drawings, the components represented by the reference numerals are as follows: 1- Heating injection molding system, 2- Heat storage device, 3- Enclosure, 10- Fixed mold, 11- Annular heating chamber, 20- Drive structure, 20- Air pump B, 21- Inlet, 22- Outlet, 23- Humidification module B, 24- Air pump A, 25- Humidification module A, 26- Air cold runner, 27- Drying assembly, 28- Shell, 31- U-shaped protective cover, 100- Frame, 270- Drying chamber, 271- Three-way valve A, 272- Three-way valve B, 273- Heating coil, 274- End plate, 275- Opening, 276- Tube body, 281- Protrusion, 282- Telescopic module, 311- Heat dissipation hole. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0021] See also Figure 1-2 As shown, the present invention is an injection molding device for producing plumbing pipe fittings, including a mold system and a heated injection molding system 1. The mold system includes a fixed mold 10 and a movable mold that cooperate with each other. The heated injection molding system 1 includes an injection pipe connected to the fixed mold 10. A check ring is also provided inside the discharge end of the injection pipe, and a nozzle is connected to the end thereof. A feed hopper 1 is connected to the heated injection molding system 1. When in use, the completely molten plastic material is injected into the mold system through the cooperation of the injection pipe and the nozzle, and molding is performed in the mold system.

[0022] In order to facilitate the drying of the plastic particles stored in the feeding hopper 1, a number of air inlet holes are opened on the side walls around the bottom of the feeding hopper 1, and an air inlet hood is arranged on the outside of the feeding hopper 1 to form an air inlet cavity. A heat storage device 2 is also provided to recover the waste heat during the cooling of the mold system. The heat storage device 2 is connected to the air inlet cavity, and when in use, air is sent into the heat storage device 2 for heating and then transported to the feeding hopper 1. The high-temperature gas formed is used to dry the plastic particles stored in the feeding hopper 11.

[0023] Specifically, the main body of the heat storage device 2 is a cylindrical structure, such as Figure 3 Three outlets 22 and three inlets 21 are respectively provided at the top and bottom of the heat storage device 2. A multi-layer air-permeable partition is provided in the heat storage device 2 between the inlet 21 and the outlet 22, and a plurality of heat storage chambers are formed by dividing the heat storage chambers by the multi-layer air-permeable partition. Each heat storage chamber is filled with a heat storage medium. The gas entering from the inlet 21 passes through the plurality of heat storage chambers in sequence and is discharged from the outlet 22.

[0024] The heat storage medium is alumina ceramic balls with a diameter of 5-8mm and a specific surface area of ​​≥300m² / g; the opening rate of the breathable partition is 40%-60%, and the distance between two adjacent breathable partitions is 3-5 times the diameter of the heat storage medium.

[0025] In order to utilize the heat storage device 2 to recover the heat of the mold system, an air cooling channel 26 is provided inside the fixed mold 10 and the movable mold. The air cooling channel 26 is connected to an inlet 21, and the air cooling channel 26 is also connected to the air pump A24 through the humidification module A25. Then, when the mold system needs to be cooled to realize product molding, humid air is injected into the air cooling channel 26 through the air pump A24 to assist in cooling, and the heated humid air is sent to the heat storage device 2 for waste heat recovery.

[0026] It can be known that when in use, the nozzle is prone to condensation of the material in the nozzle due to temperature drop, which may cause the nozzle to become blocked. Based on this, an annular heating chamber 11 is provided on the outer peripheral side of the nozzle, and the air inlet end of the annular heating chamber 11 is connected to an outlet 22 of the heat storage device 2. When in use, an air pump B20 whose air inlet end is connected to the air outlet end of the annular heating chamber 11 is used to control the gas from the heat storage device 2 to enter the annular heating chamber 11, and the annular heating chamber 11 is used to heat the nozzle to avoid temperature drop at the nozzle.

[0027] Specifically, a humidifying module B23 is installed on an inlet 21 of the heat storage device 2 , and the humidifying module B23 is connected to the exhaust end of the air pump B20 .

[0028] Specifically, the humidification module A25 and the humidification module B23 each include a chamber body, and an atomizing nozzle is installed inside the chamber body.

[0029] It can be seen that since the aforementioned use of wet air to pass into the heat storage device 2 for waste heat recovery results in high humidity in the heat storage device 2, in order to prevent the air pump B20 from being in a high humidity environment for a long time and affecting the service life of the air pump B20, a drying component 27 is further provided between the annular heating chamber 11 and the air pump B20; Figure 4 The drying component 27 includes two independent drying chambers 270, and also includes a three-way valve A271 and a three-way valve B272, and a heating coil 273 is provided in the drying chamber 270 and filled with water-absorbing drying particles; the air inlet of the three-way valve A271 is connected to the annular heating chamber 11, and the two air outlets of the three-way valve A271 are respectively connected to the heating coil 273; the air outlet end of the heating coil 273 located in one drying chamber 270 is connected to the other drying chamber 270; the two air inlets of the three-way valve B272 are respectively connected to the two drying chambers 270, and the air outlet is connected to the air pump B20; through the arrangement of two independent drying chambers 270, in actual use, when one of the two drying chambers 270 is drying the gas sent into the air pump B20, the other drying chamber 270 uses the waste heat to heat and dehumidify the water-absorbing drying material filled therein to facilitate recycling.

[0030] In order to facilitate heating and dehumidifying the water-absorbing drying material filled in the drying chamber 270, as shown in FIG. Figure 5The drying chamber 270 includes end plates 274 arranged opposite to each other, and a tube body 276 with an opening 275 on one side wall is connected between the two end plates 274; it also includes two shells 28 with arc-shaped cross-sections, the two shells 28 are in sealed contact with each other, and the inner wall surfaces at both ends of the shells 28 are in sealed contact with the side walls of the end plates 274; protrusions 281 are provided on both sides of the shells 28, and a telescopic module 282 is connected between the protrusions 281 of the two shells 28, and then when in use, the telescopic module 282 is controlled to extend to drive the two shells 28 to expand. At this time, the tube body 276 is exposed to the outside to facilitate dehumidification.

[0031] Similarly, the air inlet chamber is connected to a drying module that is the same as the drying component 27 through the air pump C, and the drying module is connected to an outlet of the heat storage device 2.

[0032] Based on the above, the present invention also includes a frame 100, on which the mold system and the heating injection molding system 1 are both mounted; a fence 3 is provided on the upper surface of the frame 100 located on the periphery of the mold system; and further includes a U-shaped protective cover 31 assembled on the fence 3, with heat dissipation holes 311 provided on the top of the U-shaped protective cover 31; and a driving structure 20 whose end is connected to the movable mold is provided on the inner wall of the fence 3.

[0033] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0034] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An injection molding device for producing water heating pipe fittings, characterized by: It comprises a mold system and a heating injection molding system (1), wherein the mold system comprises a fixed mold (10) and a movable mold that cooperate with each other; The heating injection molding system (1) comprises a nozzle for injecting completely molten plastic material into the mold system, an annular heating cavity (11) is provided on the outer peripheral side of the nozzle, and an air cold runner (26) is provided inside the fixed mold (10) and the movable mold; It also includes a heat storage device (2) provided with at least two inlets (21) and at least two outlets (22), wherein the inlet (21) is connected to an air cold flow channel (26), the air cold flow channel (26) is connected to a humidification module A (25), and the humidification module A (25) is connected to an air pump A (24); The other inlet (21) is connected to the air pump B (20) through the humidification module B (23); the air inlet end of the air pump B (20) is connected to the air outlet end of the annular heating chamber (11); and the air inlet end of the annular heating chamber (11) is connected to an outlet (22) of the heat storage device (2); The heating injection molding system (1) is connected to a feed hopper (1), a plurality of air inlet holes are provided on the side wall around the bottom of the feed hopper (1), an air inlet hood is provided on the outside of the feed hopper (1), and an air inlet cavity is formed between the air inlet hood and the feed hopper (1).

2. The water heating pipe production injection molding device according to claim 1, characterized in that: The heating injection molding system (1) further comprises an injection tube connected to the fixed mold (10), the nozzle is connected to the discharge end of the injection tube, and a check ring is further provided inside the discharge end of the injection tube.

3. The water heating pipe production injection molding device according to claim 1, characterized in that: A plurality of air-permeable partitions are provided in the heat storage device (2) between the inlet (21) and the outlet (22), and a plurality of heat storage chambers are formed by dividing the plurality of air-permeable partitions; each of the heat storage chambers is filled with a heat storage medium; and the gas entering from the inlet (21) passes through the plurality of heat storage chambers in sequence and is discharged from the outlet (22).

4. The injection molding device for producing water heating pipes according to claim 3, characterized in that: The heat storage medium is alumina ceramic balls with a diameter of 5-8 mm and a specific surface area of ​​≥300 m² / g; the porosity of the breathable baffles is 40%-60%, and the distance between two adjacent breathable baffles is 3-5 times the diameter of the heat storage medium.

5. The water heating pipe production injection molding device according to claim 1, characterized in that: Valves are provided on both the inlet (21) and the outlet (22).

6. The water heating pipe production injection molding device according to claim 1, characterized in that: It also includes a frame (100), on which the mold system and the heating injection molding system (1) are both installed; A fence (3) is provided on the upper surface of the frame (100) located on the peripheral side of the mold system; a U-shaped protective cover (31) is also provided on the fence (3), and a heat dissipation hole (311) is provided on the top of the U-shaped protective cover (31); The inner wall of the enclosure (3) is provided with a driving structure (20) whose end is connected to the movable mold.

7. The water heating pipe production injection molding device according to claim 1, characterized in that: The humidification module A (25) and the humidification module B (23) each include a chamber body, and an atomizing nozzle is installed inside the chamber body.

8. The water heating pipe production injection molding device according to claim 1, characterized in that: A drying component (27) is further provided between the annular heating chamber (11) and the air pump B (20); The drying assembly (27) includes two independent drying chambers (270), a three-way valve A (271) and a three-way valve B (272), and each of the drying chambers (270) is provided with a heating coil (273) and filled with water-absorbing drying particles; The air inlet of the three-way valve A (271) is connected to the annular heating chamber (11), and the two air outlets of the three-way valve A (271) are respectively connected to the heating coil (273); The air outlet end of the heating coil (273) located in one drying chamber (270) is connected to the other drying chamber (270); The two air inlets of the three-way valve B (272) are respectively connected to the two drying chambers (270), and the air outlet is connected to the air pump B (20).

9. The water heating pipe production injection molding device according to claim 8, characterized in that: The drying chamber (270) comprises end plates (274) arranged opposite to each other, and a tube body (276) having an opening (275) provided on one side wall is connected between the two end plates (274); It also includes two shells (28) with arc-shaped cross-sections, the two shells (28) are in sealing contact with each other, and the inner wall surfaces at both ends of the shells (28) are in sealing contact with the peripheral side walls of the end plate (274); Protrusions (281) are provided on both sides of the shell (28), and a telescopic module (282) is connected between the protrusions (281) of the two shells (28).

10. The water heating pipe production injection molding device according to claim 8, characterized in that: The air inlet chamber is connected to a drying module identical to the drying component (27) via an air pump C, and the drying module is connected to an outlet of the heat storage device (2).

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