Drying oven for injection molding material processing

Abstract

The invention provides an injection molding material processing drying oven, and relates to the technical field of drying ovens, the injection molding material processing drying oven comprises a base and a drying oven fixedly mounted on the base, a groove is formed in the base, a lifting assembly is arranged in the groove, and a first fan and a second fan are arranged on the lifting assembly; a wind wheel of the first fan is a backward-inclined centrifugal wind wheel, a wind wheel of the second fan is a forward-inclined multi-wing wind wheel, a heating cavity is formed between the drying oven and the lifting assembly, a plurality of electric heating wires are arranged in the heating cavity, an air conveying pipe is arranged between the heating cavity and the lifting assembly, and the air conveying pipe is connected with the lifting assembly. A connecting pipe is arranged between the air conveying pipe and the lifting assembly, and the drying requirements of different materials are met.

Description

Technical Field

[0001] This invention relates to the field of drying oven technology, specifically to a drying oven for injection molding. Background Technology

[0002] Drying ovens for injection molding are crucial equipment in the pretreatment of plastics before molding. Their main function is to remove moisture from plastic granules through heating and dehumidification, preventing quality defects such as bubbles and silver streaks during injection molding. Traditional drying ovens typically consist of a chamber, heating device, air supply system, and control system. Their working principle involves a fan drawing ambient air into the heating device to create hot air. This hot air rises through the plastic granules in the hopper, carrying away moisture before being discharged through the exhaust port. This basic structure, using a single fan and electric heating wire, has become a standard configuration widely adopted in the injection molding industry due to its simplicity and cost-effectiveness.

[0003] For example, Chinese Patent Publication No. CN202320657617.5 discloses an energy-saving drying oven, including a hollow internal structure. The oven contains multiple trays, each with multiple ventilation holes at its bottom. A transmission chamber is located on one side of the oven, and racks are fixed to one side of each tray. One side of each rack extends into the transmission chamber, which contains a drive assembly for moving the racks. A ventilation plate is fixed to the oven via this assembly. A heating chamber is fixed to the bottom of the oven, containing a heating assembly. The drive assembly facilitates the movement of the trays, and multiple springs allow the trays to be reset, creating a swaying motion that increases the material's surface contact with external heat, thus improving vaporization. The heating assembly facilitates heating and drying, and the ventilation plate promotes heat circulation, increasing energy utilization.

[0004] However, in the above technical solutions, due to the significant differences in particle size, shape and bulk density of different plastic materials, the requirements for drying air volume are different: light and fluffy materials require a large air volume to transport heat, while dense and fine materials require higher air pressure to overcome resistance. The single-performance fans equipped in traditional equipment cannot meet these contradictory requirements at the same time, and the phenomenon of light materials being blown apart or heavy materials being dried unevenly often occurs. Although the fan speed can be adjusted by frequency converter, it is difficult to break through the limitations of the inherent performance curve of the fan, resulting in unstable drying effect and energy waste. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a drying oven for injection molding processes, which can effectively solve the problems in the background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a drying oven for injection molding, comprising a base and a drying oven fixedly mounted on the base. The base has a groove, and a lifting assembly is disposed within the groove. A first fan and a second fan are disposed on the lifting assembly. The first fan has a backward-inclined centrifugal impeller, and the second fan has a forward-inclined multi-blade impeller. A heating chamber is disposed between the drying oven and the lifting assembly. Several heating wires are disposed inside the heating chamber. An air supply pipe is disposed between the heating chamber and the lifting assembly, and a connecting pipe is disposed between the air supply pipe and the lifting assembly.

[0007] Preferably, the base has first air inlets on both sides that communicate with the groove.

[0008] Preferably, an air outlet is provided on one side of the drying oven.

[0009] Preferably, the first fan and the second fan are mounted vertically on the lifting assembly.

[0010] Preferably, the lifting assembly includes a component base, which is slidably disposed in a groove, and a hydraulic rod is provided on one side below the component base.

[0011] Preferably, the component base is provided with several second air inlets and several guide grooves on both sides, and a guide column is slidably disposed in the guide groove.

[0012] Preferably, the guide slide and hydraulic rod are fixedly installed in the groove.

[0013] Preferably, the connecting pipe includes a connecting pipe body, a toothed groove is provided on one side of the outer wall of the connecting pipe body, and a gear is meshed on one side of the toothed groove. The gear is driven by a motor fixedly mounted on the base through a rotating column.

[0014] Preferably, the inner walls of both sides of the connecting pipe body are provided with a sealing layer.

[0015] Preferably, the main body of the connecting pipe is slidably connected to the base.

[0016] This invention provides a drying oven for injection molding processes. It has the following beneficial effects: (1) When the blower needs to be switched, the operator first selects the first blower or the second blower according to the material characteristics. Then, the hydraulic rod is started to drive the component base to make precise lifting and lowering movements in the groove along the guide slide column, so that the outlet of the selected target blower moves to the docking position. At the same time, the motor is started and the connecting pipe body is driven to slide through the meshing transmission of gear and tooth groove, so that its inlet is tightly fitted on the outlet of the target blower. At this time, the sealing layer of the inner wall of the connecting pipe body ensures the airtightness of the connection. After the selected blower is started, the external air is sucked in through the first air inlet hole on both sides of the base and the second air inlet hole on the component base. The generated airflow enters the heating chamber through the connecting pipe and the air supply pipe. After heat exchange with the heating wire, it is transformed into dry hot air. Finally, the dry hot air is sent into the drying oven to dry the plastic raw material. The humid exhaust gas is discharged from the outlet. Thus, the precise switching and docking of blowers with different performance is achieved through mechanical transmission to meet the drying needs of different materials. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the lifting assembly in this invention; Figure 4 This is a schematic diagram of the connecting pipe in this invention.

[0018] The components include: 1. Base; 2. Drying oven; 3. Groove; 4. Lifting assembly; 401. Assembly base; 402. Second air inlet; 403. Guide slide; 404. Guide slide column; 405. Hydraulic rod; 5. First fan; 6. Second fan; 7. Heating chamber; 8. Heating wire; 9. Air duct; 10. Air outlet; 11. Connecting pipe; 1101. Connecting pipe body; 1102. Sealing layer; 1103. Gear groove; 1104. Gear; 1105. Rotating column; 1106. Motor; 12. First air inlet. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figure 1 and Figure 2As shown, this embodiment of the invention provides a drying oven for injection molding, including a base 1 and a drying oven 2 fixedly installed on the base 1. The base 1 is provided with a groove 3, and a lifting assembly 4 is provided in the groove 3. A first fan 5 and a second fan 6 are provided on the lifting assembly 4. The impeller of the first fan 5 is a backward-inclined centrifugal impeller, and the impeller of the second fan 6 is a forward-inclined multi-blade impeller. A heating chamber 7 is provided between the drying oven 2 and the lifting assembly 4. A plurality of heating wires 8 are provided inside the heating chamber 7. An air supply pipe 9 is provided between the heating chamber 7 and the lifting assembly 4. A connecting pipe 11 is provided between the air supply pipe 9 and the lifting assembly 4. The base 1 has first air inlet holes 12 on both sides that communicate with the groove 3; An air outlet 10 is provided on one side of the drying oven 2.

[0021] like Figure 3 As shown, the lifting assembly 4 includes an assembly base 401, which is slidably disposed in the groove 3, and a hydraulic rod 405 is provided on one side below the assembly base 401; The component base 401 is provided with several second air inlets 402 and several guide grooves 403 on both sides, and guide columns 404 are slidably disposed in the guide grooves 403.

[0022] With the above technical solution, when it is necessary to switch the fan, the hydraulic rod 405 is activated, and its piston rod extends or retracts, thereby pushing or pulling the component base 401 to move vertically along the groove 3. During this process, the guide slide column 404 fixedly installed in the groove 3 forms a sliding fit with the guide slide groove 403 on both sides of the component base 401, providing precise guidance and stable support for the lifting and lowering of the component base 401, effectively preventing it from deviating or getting stuck during the movement, and ultimately ensuring that the first fan 5 or the second fan 6 fixed on the component base 401 can move accurately to the predetermined position to be connected with the connecting pipe 11. At the same time, external air can be smoothly drawn in by the fan through several second air inlets 402 provided on both sides of the component base 401.

[0023] like Figure 4 As shown, the connecting pipe 11 includes a connecting pipe body 1101. A toothed groove 1103 is provided on one side of the outer wall of the connecting pipe body 1101. A gear 1104 is meshed on one side of the toothed groove 1103. The gear 1104 is driven by a motor 1106 fixedly mounted on the base 1 through a rotating column 1105. The inner walls of both sides of the connecting pipe body 1101 are provided with sealing layers 1102.

[0024] Through the above technical solution, after the lifting component 4 transports the target fan to the vicinity of the docking position, the motor 1106 fixedly installed on the base 1 starts and drives the gear 1104 to rotate through the rotating column 1105. Since the gear 1104 meshes with the tooth groove 1103 set on the outer wall of the connecting pipe body 1101 and the connecting pipe body 1101 forms a sliding connection with the base 1, the rotational motion is converted into the horizontal linear motion of the connecting pipe body 1101, so that its inlet actively moves toward the air outlet of the target fan and finally fits tightly. During this process, the sealing layer 1102 set on the inner wall of the inner cavity on both sides of the connecting pipe body 1101 fits tightly with the outer wall of the fan outlet to form a sealed connection interface, thereby effectively preventing airflow leakage at the key docking point and ensuring the air tightness and air supply efficiency of the air supply system.

[0025] Working principle: When switching fans is required, the operator first selects either the first fan 5 or the second fan 6 based on the material characteristics. Then, the hydraulic rod 405 is activated, driving the component base 401 to move precisely up and down along the guide slide 404 within the groove 3, moving the outlet of the selected target fan to the docking position. Simultaneously, the motor 1106 is started, and through the meshing of the gear 1104 and the tooth groove 1103, the connecting pipe body 1101 is driven to slide, ensuring its inlet is tightly fitted onto the outlet of the target fan. At this time, the sealing layer 1102 on the inner wall of the connecting pipe body 1101 ensures the airtightness of the connection. The selected fan then starts... After activation, external air is drawn in sequentially through the first air inlet 12 on both sides of the base 1 and the second air inlet 402 on the component base 401. The resulting airflow enters the heating chamber 7 sequentially through the connecting pipe 11 and the air supply pipe 9. Here, it exchanges heat with the heating wire 8 and is transformed into dry hot air. Finally, the dry hot air is sent into the drying oven 2 (the structure and principle of which have been described in detail in the comparative document, so they will not be repeated here) to dry the plastic raw materials. The humid exhaust gas is discharged from the air outlet 10. Thus, the precise switching and docking of different performance fans is achieved through mechanical transmission to meet the drying needs of different materials.

[0026] When it is necessary to switch fans, the hydraulic rod 405 is activated, and its piston rod extends or retracts, thereby pushing or pulling the component base 401 to move vertically along the groove 3. During this process, the guide slide column 404 fixedly installed in the groove 3 forms a sliding engagement with the guide slide groove 403 on both sides of the component base 401, providing precise guidance and stable support for the lifting and lowering of the component base 401, effectively preventing it from shifting or getting stuck during the movement, and ultimately ensuring that the first fan 5 or the second fan 6 fixed on the component base 401 can move accurately to the predetermined position to be connected with the connecting pipe 11. At the same time, external air can be smoothly drawn in by the fans through several second air inlets 402 provided on both sides of the component base 401.

[0027] When the lifting assembly 4 transports the target fan to the vicinity of the docking position, the motor 1106, which is fixedly installed on the base 1, starts and drives the gear 1104 to rotate through the rotating column 1105. Since the gear 1104 meshes with the tooth groove 1103 set on the outer wall of one side of the connecting pipe body 1101, and the connecting pipe body 1101 and the base 1 form a sliding connection, the rotational motion is converted into the horizontal linear motion of the connecting pipe body 1101, so that its inlet actively moves toward the air outlet of the target fan and finally fits tightly. During this process, the sealing layer 1102 set on the inner wall of the inner cavity on both sides of the connecting pipe body 1101 fits tightly with the outer wall of the fan outlet, forming a sealed connection interface, thereby effectively preventing airflow leakage at the key docking point and ensuring the airtightness and air supply efficiency of the air supply system.

[0028] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A drying oven for injection molding, comprising a base (1) and a drying oven (2) fixedly mounted on the base (1), characterized in that: The base (1) is provided with a groove (3), and a lifting assembly (4) is provided in the groove (3). A first fan (5) and a second fan (6) are provided on the lifting assembly (4). The impeller of the first fan (5) is a backward-inclined centrifugal impeller, and the impeller of the second fan (6) is a forward-inclined multi-blade impeller. A heating chamber (7) is provided between the drying oven (2) and the lifting assembly (4). Several heating wires (8) are provided inside the heating chamber (7). An air supply pipe (9) is provided between the heating chamber (7) and the lifting assembly (4). A connecting pipe (11) is provided between the air supply pipe (9) and the lifting assembly (4).

2. The drying oven for injection molding according to claim 1, characterized in that: The base (1) has a first air inlet (12) on both sides that communicates with the groove (3).

3. A drying oven for injection molding according to claim 2, characterized in that: An air outlet (10) is provided on one side of the drying oven (2).

4. A drying oven for injection molding according to claim 3, characterized in that: The first fan (5) and the second fan (6) are mounted vertically on the lifting assembly (4).

5. A drying oven for injection molding according to claim 4, characterized in that: The lifting assembly (4) includes an assembly base (401), which is slidably disposed in a groove (3), and a hydraulic rod (405) is provided on one side below the assembly base (401).

6. A drying oven for injection molding according to claim 5, characterized in that: The component base (401) is provided with several second air inlets (402) and several guide grooves (403) on both sides, and guide slides (404) are slidably arranged in the guide grooves (403).

7. A drying oven for injection molding according to claim 6, characterized in that: The guide slide (404) and hydraulic rod (405) are fixedly installed in the groove (3).

8. A drying oven for injection molding according to claim 7, characterized in that: The connecting pipe (11) includes a connecting pipe body (1101), and a toothed groove (1103) is provided on one side of the outer wall of the connecting pipe body (1101). A gear (1104) is meshed on one side of the toothed groove (1103). The gear (1104) is driven by a motor (1106) fixedly installed on the base (1) through a rotating column (1105).

9. A drying oven for injection molding according to claim 8, characterized in that: The inner walls of both sides of the connecting pipe body (1101) are provided with sealing layers (1102).

10. A drying oven for injection molding according to claim 9, characterized in that: The main body (1101) of the connecting pipe is slidably connected to the base (1).

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