An external air cooling structure for a melt cylinder of an injection molding machine

Abstract

The present invention relates to the technical field of cooling devices, and more specifically, it relates to an external air-cooling structure of a melt cylinder of an injection molding machine, comprising an air-cooling hood, a plurality of fans and a plurality of baffle rings. The air-cooling hood is for the melt cylinder to pass through, a plurality of air inlets are provided on the top of the air-cooling hood, a plurality of fans are respectively installed at the plurality of air inlets, an air outlet is provided at the bottom of the air-cooling hood, the number of baffle rings is one more than the number of fans, and the plurality of baffle rings are movably arranged in the air-cooling hood along the axial direction of the air-cooling hood, two adjacent baffle rings are located on the left and right sides below the same fan, and an annular air flow channel is formed between the two adjacent baffle rings. When a local overheating area appears in the melt cylinder, the baffle rings on both sides of the local overheating area are relatively close. The external air-cooling structure of the melt cylinder of an injection molding machine of the present invention can effectively accelerate the cooling speed of the local overheating area of ​​the melt cylinder.

Description

Technical Field

[0001] The invention relates to the technical field of cooling devices, in particular to an external air cooling structure of a melt cylinder of an injection molding machine. Background Art

[0002] The purpose of adding an external air cooling structure to the melt cylinder of the injection molding machine is to effectively control the temperature of the melt cylinder, prevent heat accumulation or overheating during the injection molding process, help the melt cylinder maintain the temperature within a certain range, prevent the plastic from decomposing or degrading due to overheating, and ensure the quality of the injection molded product.

[0003] In the prior art, the patent with publication number CN204054560U discloses an air-cooled melt cylinder cover for an injection molding machine, including a centrifugal fan and a melt cylinder cover, the melt cylinder cover is mounted on the outside of the melt cylinder, and an annular air flow channel is provided between the inner wall of the melt cylinder cover and the outer wall of the melt cylinder, an air inlet pipe is provided on the upper side of the annular air flow channel, an air outlet is provided on the lower side of the annular air flow channel, the upper opening of the air inlet pipe is fixedly connected to the air outlet pipe of the centrifugal fan through a flange, and a retaining ring is provided in the annular air flow channel between adjacent centrifugal fans. This prior art can isolate and cool the heating rings of each section of the melt cylinder surface, effectively reducing the overall temperature of the melt cylinder to a reasonable range.

[0004] However, the above cooling structure is still insufficient in processing speed for local overheating of the melt tube. The reason is that the size of the annular air flow channel is fixed and cannot be adjusted according to the range of the local overheating area of ​​the melt tube. In particular, when the local overheating area is smaller than the size of the annular air flow channel, the cooling effect will be dispersed, making it difficult to concentrate wind power to process the local overheating area, thereby affecting the cooling speed of the local overheating area. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present application provides an external air cooling structure for a melt cylinder of an injection molding machine.

[0006] The external air cooling structure of the melt cylinder of an injection molding machine provided by the present invention adopts the following technical solution:

[0007] An external air cooling structure for a melt cylinder of an injection molding machine comprises an air cooling hood, a plurality of fans and a plurality of baffle rings, the air cooling hood being for the melt cylinder to pass through, a plurality of air inlets being provided on the top of the air cooling hood, a plurality of fans being respectively installed at the plurality of air inlets, an air outlet being provided at the bottom of the air cooling hood, the number of the baffle rings being one more than the number of the fans, a plurality of the baffle rings being movably arranged in the air cooling hood along the axial direction of the air cooling hood, two adjacent baffle rings being located on the left and right sides below the same fan, an annular air flow channel being formed between the two adjacent baffle rings, and when a local overheating area appears in the melt cylinder, the baffle rings on both sides of the local overheating area are relatively close to each other.

[0008] Preferably, the air inlet is provided with a guide grille, and the guide grille diffuses the airflow blown out by the fan.

[0009] Preferably, guide rods are provided in the air cooling hood, and the guide rods pass through the plurality of baffle rings in sequence along the axial direction of the air cooling hood, and the guide rods are used to guide the movement of the baffle rings.

[0010] Preferably, a first motor is fixedly mounted on one side of the retaining ring, and a travel wheel is coaxially connected to the output end of the first motor, a circumferential outer contour of the travel wheel contacts the guide rod, and an axis of the travel wheel is perpendicular to the axis of the guide rod.

[0011] Preferably, an infrared temperature sensor is provided on the outer side of the air-cooling hood, and the infrared temperature sensor is used to monitor the heating condition of the melt cylinder.

[0012] Preferably, an air outlet is provided at the top of the baffle ring, and an adjustment plate is movably provided at the air outlet. When the two baffle rings are relatively close to each other, the adjustment plate at the top is opened to connect the two adjacent annular air flow channels at the air outlet.

[0013] Preferably, the adjustment plates are opened and closed by means of hinges, and when the adjustment plates of the two relatively close retaining rings are opened, a V-shape is formed between the two adjustment plates.

[0014] Preferably, the left and right sides of the top of the adjustment plate are connected with rotating shafts, the adjustment plate is hinged on the retaining ring through the rotating shafts, two second motors are arranged in the retaining ring, and the output shafts of the two second motors are coaxially connected to the two rotating shafts respectively.

[0015] Preferably, the two baffle rings stop after moving to the edge of the air inlet or the edge of the local overheating area during the process of getting closer to each other.

[0016] Preferably, the air-cooling hood is an assembled structure, and the air-cooling hood is cut into a left hood and a right hood along the axial direction. The left hood and the right hood are connected by bolts, and the two ends of the air-cooling hood in the axial direction are a front end plate and a rear end plate, and the front end plate and the rear end plate are fixed to the ends of the air-cooling hood by screws.

[0017] The beneficial effects of the present invention are:

[0018] 1. When the melt cylinder is locally overheated, the baffle rings on both sides of the local overheating area are relatively close until they reach the edge of the air inlet or the edge of the local overheating area, and finally the annular air flow channel where the local overheating area is located is reduced. At this time, the dispersed air flow will be concentrated to the local overheating area, thereby quickly taking away the heat of the local overheating area and achieving the effect of rapid cooling;

[0019] 2. When the melt tube is locally overheated, the baffle rings on both sides of the local overheating area are first relatively close, and then the adjustment plates of the two baffle rings are opened to open the corresponding air outlets. Since the annular air flow channel in the local overheating area is smaller at this time, the wind speed of the annular air flow channel in the local overheating area is faster under the action of the fan with the same power. Based on the Bernoulli principle, the greater the flow rate, the smaller the pressure. At this time, the wind of the annular air flow channel on both sides of the local overheating area will be supplemented into the annular air flow channel in the local overheating area at the air outlet, thereby enhancing the wind cooling effect of the local overheating area and further improving the cooling speed of the local overheating area;

[0020] 3. In the annular air flow channel where the local overheating area is located, the adjustment plates of the two baffle rings are V-shaped, which has a gathering effect on the scattered airflow and can also improve the cooling effect on the local overheating area. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a cross-sectional view of the air-cooling structure in the embodiment of the present application;

[0022] Figure 2 This is a diagram showing the air intake effect of the fan under the air guide grille in the embodiment of the present application;

[0023] Figure 3 The air cooling structure in the embodiment of the present application is Figure 1 A cross-sectional view at AA;

[0024] Figure 4 In the embodiment of the present application, the retaining ring is Figure 1 A cross-sectional view at BB;

[0025] Figure 5 It is a cross-sectional view of the air-cooling structure in another state in the embodiment of the present application.

[0026] Explanation of the reference numerals: 1. Glue melting cylinder; 2. Air cooling hood; 21. Left hood; 22. Right hood; 23. Front end plate; 24. Rear end plate; 31. Air inlet; 32. Air outlet; 4. Fan; 5. Blocking ring; 51. Air outlet; 52. Adjustment plate; 6. Guide rod; 71. First motor; 72. Travel wheel; 81. Second motor; 82. Rotating shaft; 9. Infrared temperature sensor. DETAILED DESCRIPTION

[0027] The following will be combined with the attached Figure 1 -Attached Figure 5 The present invention is further illustrated by the following embodiments.

[0028] This embodiment discloses an external air cooling structure for a melt cylinder of an injection molding machine.

[0029] Reference Figures 1 to 3 The external air-cooling structure of the melt cylinder of the injection molding machine includes an air-cooling cover 2, a plurality of fans 4 and a plurality of baffle rings 5. The air-cooling cover 2 is cylindrical, and through holes are provided at both ends of the air-cooling cover 2 in the axial direction. The two through holes in the axial direction of the air-cooling cover 2 are respectively provided for the feeding end and the injection end of the melt cylinder 1 to pass through, so that the melting zone and the mixing zone of the melt cylinder 1 are located in the air-cooling cover 2. A plurality of air inlets 31 are provided at the top of the air-cooling cover 2, and the air inlets 31 penetrate the top of the air-cooling cover 2 in the radial direction of the air-cooling cover 2, and the plurality of air inlets 31 are evenly spaced along the axial direction of the air-cooling cover 2. The number of the plurality of air inlets 31 is consistent with the number of the plurality of fans 4, so that the plurality of fans 4 are installed on the plurality of air inlets 31 in a one-to-one correspondence. In the present embodiment, four fans 4 are provided. An air outlet 32 ​​is provided at the bottom of the air-cooling hood 2, and the length of the air outlet 32 ​​extends from one inner end face of the air-cooling hood 2 in the axial direction to the other inner end face, so that the air outlet 32 ​​is opposite to multiple air inlets 31 in the vertical direction at the same time. The number of baffle rings 5 ​​is one more than the number of fans 4, so in this embodiment, the number of baffle rings 5 ​​is five, and the five baffle rings 5 ​​are arranged inside the air-cooling hood 2 at intervals along the axial direction of the air-cooling hood 2, and two adjacent baffle rings 5 ​​are located on the left and right sides under the same fan 4, and an annular air flow channel is formed between the two adjacent baffle rings 5. Based on the above arrangement, when the fan 4 is started, air enters the air inlet 31, and an annular air flow is formed in the annular air flow channel between the two adjacent baffle rings 5, and multiple annular air flows eventually flow out from the air outlet 32, thereby taking away part of the heat in the melting zone and mixing zone of the melt glue cylinder 1, so as to control the working temperature of the melt glue cylinder 1. It should be noted that a guide grille needs to be provided at the air inlet 31. The function of the guide grille is to first adjust the more concentrated airflow into a more dispersed airflow, so that under normal working conditions, the cold air can be evenly blown to various parts of the melt cylinder 1, thereby evenly taking away the temperature of various parts of the melt cylinder 1, achieving a unified temperature control effect.

[0030] When local overheating occurs in one of the melting zones or mixing zones of the melt tube 1, it is difficult to quickly cool down the local overheated area through uniform temperature control achieved by the dispersed airflow. Therefore, the air cooling structure of the present invention further makes the following improvements.

[0031] Reference Figures 1 to 3, multiple baffle rings 5 ​​are movably arranged along the axial direction of the air-cooling hood 2. When the melt glue cylinder 1 is locally overheated, the baffle rings 5 ​​on both sides of the local overheating area are relatively close until they reach the edge of the air inlet 31 or the edge of the local overheating area, and finally the annular air flow channel where the local overheating area is located is reduced. At this time, the dispersed airflow will be concentrated and blown to the local overheating area, thereby quickly taking away the heat of the local overheating area, achieving the effect of rapid cooling. Specifically, a guide rod 6 is connected between the two inner end surfaces in the axial direction of the air-cooling hood 2. The number of guide rods 6 is two, and the two rods are parallel to each other. The two guide rods 6 pass through multiple baffle rings 5 ​​in sequence along the axial direction of the air-cooling hood 2. The guide rod 6 is used to guide the movement of the baffle ring 5. A first motor 71 is fixedly installed on one side of the baffle ring 5. The output end of the first motor 71 is coaxially connected to a walking wheel 72. The circumferential outer contour of the walking wheel 72 contacts the guide rod 6, and the axis of the walking wheel 72 is perpendicular to the axis of the guide rod 6. Through the above arrangement, when the first motor 71 drives the running wheel 72 to rotate, the running wheel 72 can run along the axial direction of the guide rod 6, thereby driving the retaining ring 5 to move along the guide rod 6, and finally enabling the retaining ring 5 to narrow or expand the annular air flow channel through movement, so as to switch between the two modes of unified temperature control and local overheating and cooling. In this embodiment, two sets of first motors 71 and running wheels 72 are provided on a retaining ring 5. In addition, in order to promptly detect the local overheating of the melt tube 1, an infrared temperature sensor 9 needs to be provided on the outer side of the air cooling cover 2, so as to monitor the heating condition of the melt tube 1 through the infrared temperature sensor 9, and control the corresponding retaining ring 5 to move after detecting the local overheating.

[0032] Reference Figures 1 to 5 , an air port 51 is provided on the top of the baffle ring 5, and an adjustment plate 52 is movably provided on the air port 51. When the adjustment plate 52 is opened, two adjacent annular air flow channels are connected at the air port 51. The purpose of setting the air port 51 and the adjustment plate 52 is that when the melt tube 1 is locally overheated, the baffle rings 5 ​​on both sides of the local overheating area are relatively close to each other first, and then the adjustment plates 52 of the two baffle rings 5 ​​are opened to open the corresponding air port 51. Since the annular air flow channel where the local overheating area is located is smaller at this time, under the action of the fan 4 of the same power, the wind speed of the annular air flow channel where the local overheating area is located is faster. Based on the Bernoulli principle, the greater the flow rate, the smaller the pressure. At this time, the wind of the annular air flow channels on both sides of the local overheating area will be supplemented to the annular air flow channel where the local overheating area is located at the air port 51, thereby enhancing the wind cooling effect of the local overheating area and further improving the cooling speed of the local overheating area. It should be noted that the shape of the adjustment plate 52 can be rectangular, arc-shaped, etc. Similarly, the adjustment plate 52 can be opened in a variety of ways, such as sliding opening, hinged opening, etc., and is not limited to any one of them.

[0033] Reference Figure 4and Figure 5 In this embodiment, the adjustment plate 52 is an arc-shaped plate, and the adjustment plate 52 is hinged to open. Specifically, the left and right sides of the top of the adjustment plate 52 are connected with a rotating shaft 82, and the adjustment plate 52 is hinged to the retaining ring 5 through the rotating shaft 82. Two second motors 81 are arranged in the retaining ring 5, and the output shafts of the two second motors 81 are coaxially connected with the two rotating shafts 82 respectively. When the adjustment plate 52 needs to be opened, the second motor 81 controls the adjustment plate 52 to rotate, and makes the lower end of the adjustment plate 52 enter the annular air duct where the local overheating area is located. At this time, in the annular air flow duct where the local overheating area is located, the adjustment plates 52 of the two retaining rings 5 ​​are V-shaped, which has a gathering effect on the dispersed airflow, and can also improve the cooling effect on the local overheating area.

[0034] Reference Figure 1 and Figure 3 The air-cooling cover 2 of the air-cooling structure of the present invention is an assembled structure. Specifically, the air-cooling cover 2 is cut into a left cover 21 and a right cover 22 along the axial direction. The left cover 21 and the right cover 22 are connected by bolts. The two ends of the air-cooling cover 2 in the axial direction are a front end plate 23 and a rear end plate 24. The front end plate 23 and the rear end plate 24 are fixed to the end of the air-cooling cover 2 by screws. By setting the air-cooling cover 2 as an assembled structure, the effect of facilitating disassembly and assembly of the air-cooling cover 2 is achieved.

[0035] In summary, the implementation principle of the external air cooling structure of the melt cylinder 1 of an injection molding machine in this embodiment is as follows: when the melt cylinder 1 is working normally, the multiple baffle rings 5 ​​are evenly spaced, so that the cooling effect of each part of the melt cylinder 1 is basically the same, which plays a unified temperature control effect. When the melt cylinder 1 is locally overheated, the baffle rings 5 ​​on both sides of the local overheating area are relatively close to each other, reducing the size of the annular air flow channel where the local overheating area is located, thereby concentrating the air flow to the local overheating area and increasing the cooling rate of the local overheating area. At this time, the adjustment plate 52 is opened. On the one hand, the adjustment plate 52 between the two baffle rings 5 ​​is V-shaped to further gather the air flow in the local overheating area. On the other hand, the adjustment plate 52 opens the air port 51, and the wind in the annular air flow channels on both sides will be added to the annular air flow channel under the negative pressure state at the air port 51, thereby increasing the air volume passing through the local overheating area and further improving the cooling effect.

[0036] The above are all preferred embodiments of the present invention, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An external air cooling structure for a melt cylinder of an injection molding machine, characterized in that: The invention comprises an air-cooling hood (2), a plurality of fans (4) and a plurality of baffle rings (5); the air-cooling hood (2) is for a melt glue cylinder (1) to pass through; a plurality of air inlets (31) are provided at the top of the air-cooling hood (2); a plurality of fans (4) are respectively installed at the plurality of air inlets (31); an air outlet (32) is provided at the bottom of the air-cooling hood (2); the number of baffle rings (5) is one more than the number of fans (4); a plurality of baffle rings (5) are movably arranged in the air-cooling hood (2) along the axial direction of the air-cooling hood (2); two adjacent baffle rings (5) are located on the left and right sides below the same fan (4); an annular air flow channel is formed between the two adjacent baffle rings (5); when a local overheating area appears in the melt glue cylinder (1), the baffle rings (5) on both sides of the local overheating area are relatively close.

2. The external air cooling structure of the melt cylinder of an injection molding machine according to claim 1 is characterized in that: The air inlet (31) is provided with a guide grille, and the guide grille diffuses the airflow blown out by the fan (4).

3. The external air cooling structure of the melt cylinder of an injection molding machine according to claim 2 is characterized in that: A guide rod (6) is arranged inside the air cooling cover (2), and the guide rod (6) passes through a plurality of the retaining rings (5) in sequence along the axial direction of the air cooling cover (2). The guide rod (6) is used to guide the movement of the retaining rings (5).

4. The external air cooling structure of the melt cylinder of an injection molding machine according to claim 3 is characterized in that: A first motor (71) is fixedly mounted on one side of the retaining ring (5); an output end of the first motor (71) is coaxially connected to a running wheel (72); a circumferential outer contour of the running wheel (72) contacts the guide rod (6), and an axis of the running wheel (72) is perpendicular to the axis of the guide rod (6).

5. The external air cooling structure of the melt cylinder of an injection molding machine according to claim 4 is characterized in that: An infrared temperature sensor (9) is arranged on the outside of the air-cooling cover (2), and the infrared temperature sensor (9) is used to monitor the heating condition of the melt glue cylinder (1).

6. The external air cooling structure of the melt cylinder of an injection molding machine according to claim 5, characterized in that: The top of the baffle ring (5) is provided with an air outlet (51), and the air outlet (51) is movably provided with an adjustment plate (52). When the two baffle rings (5) are relatively close to each other, the adjustment plate (52) on the top thereof is opened, so that two adjacent annular air flow channels are connected at the air outlet (51).

7. The external air cooling structure of the melt cylinder of an injection molding machine according to claim 6, characterized in that: The adjustment plates (52) are opened and closed in a hinged manner. When the adjustment plates (52) of the two relatively close baffle rings (5) are opened, a V-shape is formed between the two adjustment plates (52).

8. The external air cooling structure of the melt cylinder of an injection molding machine according to claim 7, characterized in that: The left and right sides of the top of the adjustment plate (52) are connected to a rotating shaft (82), and the adjustment plate (52) is hinged to the retaining ring (5) through the rotating shaft (82). Two second motors (81) are arranged in the retaining ring (5), and the output shafts of the two second motors (81) are coaxially connected to the two rotating shafts (82) respectively.

9. The external air cooling structure of the melt cylinder of an injection molding machine according to claim 1, characterized in that: During the process of getting closer to each other, the two baffle rings (5) move to the edge of the air inlet (31) or the edge of the local overheating area and then stop.

10. The external air cooling structure of the melt cylinder of an injection molding machine according to claim 1, characterized in that: The air cooling cover (2) is an assembled structure. The air cooling cover (2) is cut into a left cover (21) and a right cover (22) along the axial direction. The left cover (21) and the right cover (22) are connected by bolts. The two ends of the air cooling cover (2) in the axial direction are a front end plate (23) and a rear end plate (24). The front end plate (23) and the rear end plate (24) are fixed to the ends of the air cooling cover (2) by screws.

Images