Injection molding material blending device

Abstract

The utility model relates to an injection molding material blending device in the technical field of injection molding, which comprises a blending tank, a detachable top cover is arranged at the top end of the blending tank, a central pipe is arranged in the blending tank, a central air bag is fixedly arranged at the outer end of the central pipe, and a plurality of lower vent holes positioned in the central air bag are formed in the outer end of the central pipe. The central air bag is communicated with the interior of the central pipe through the lower vent hole, and a pressure control assembly used for controlling the air pressure of the central pipe and the central air bag is arranged on the rear side of the blending tank. The pressure control component is used for continuously inflating and deflating the interior of the central air bag while stirring, so that the central air bag is continuously switched between an expansion state and a wizened state, and when the central air bag is switched from the expansion state to the wizened state, scraped materials on the inner wall of the blending tank can move towards the central position in the blending tank, so that the materials can be uniformly mixed. Therefore, the materials can be stirred more sufficiently, and the materials can be blended more uniformly.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, and in particular to an injection molding material mixing device. Background Technology

[0002] Automotive injection molded parts are a type of automotive accessories made of plastic, such as interior seat handles, rearview mirror housings, and lamp covers. These accessories use plastic as the raw material. In the processing, the raw material is first heated and melted, and then the melted raw material is injected into the mold under pressure. After it cools and solidifies, the corresponding product can be made.

[0003] The plastic raw materials used in injection molding are generally in granular form. Before heating and melting them, they need to be pre-mixed. Mixing means mixing the raw materials with colorants, plasticizers and other auxiliary materials in a certain proportion and stirring them evenly to make the finished product have better gloss and better flexibility. For example, there is a material mixing device for injection molding of automotive plastic parts disclosed in the prior art, CN116373149A.

[0004] The aforementioned mixing device incorporates a scraper structure to prevent materials from adhering to the inner wall of the container. This scraper removes materials stuck to the container's inner wall. However, the scraped-off material is close to the container's inner wall, away from the center of the container, while the mixing structure is located in the center. This makes it difficult for the scraped-off material to get close to the center of the container, thus hindering thorough mixing and affecting the mixing effect. Furthermore, the scraped-off material is close to the container's inner wall and easily re-adheres, reducing scraping efficiency. Utility Model Content

[0005] To address the problem mentioned in the background art that the material scraped from the inner wall of the container is difficult to fully mix, this utility model provides the following technical solution:

[0006] A mixing device for injection molding materials includes a mixing tank, the top of which is provided with a detachable top cover, a central tube is provided inside the mixing tank, both ends of the central tube are closed, and a central airbag is fixedly provided at the outer end of the central tube.

[0007] The outer end of the central tube has multiple lower vent holes located inside the central air bladder. The central air bladder communicates with the interior of the central tube through the lower vent holes. The central air bladder is not elastic. A pressure control component for controlling the air pressure of the central tube and the central air bladder is provided on the rear side of the mixing tank.

[0008] Furthermore, the pressure control assembly includes a protrusion fixedly disposed on the rear side of the mixing tank. The bottom end of the protrusion has an inner cavity, and the top end of the protrusion is fixedly disposed with a vent pipe communicating with the inside of the inner cavity. A pad is disposed inside the protrusion, and a rubber pad is fixedly disposed on the top end of the pad. The outer end of the rubber pad contacts the inner wall of the inner cavity. A hydraulic cylinder is disposed at the bottom of the protrusion, and the top end of the piston rod of the hydraulic cylinder extends into the inner cavity and is fixedly connected to the bottom end of the pad.

[0009] Furthermore, the top of the top cover is provided with a fixed bracket, and a motor for driving the rotation of the central tube is fixedly mounted on the top of the fixed bracket. A sleeve is fixedly mounted on the bottom of the fixed bracket. One end of the air guide pipe is fixedly connected to the rear side of the sleeve and communicates with the inside of the sleeve. The top of the central tube passes through the top cover and extends into the inside of the sleeve. The central tube is movably connected to the top cover and the sleeve through a sealed bearing. The top of the central tube passes through the fixed bracket and is fixedly connected to the output shaft of the motor. The outer end of the central tube has multiple upper vent holes located inside the sleeve, and the central tube communicates with the inside of the sleeve through the upper vent holes.

[0010] Furthermore, the bottom of the mixing tank is fixedly equipped with a discharge pipe with a valve, the bottom of the mixing tank is equipped with a base, the bottom of the hydraulic cylinder is connected to the top of the base, the top of the base is fixedly equipped with two upright plates, the tops of the two upright plates extend to both sides of the mixing tank and are fixedly connected to the mixing tank, the top of the top cover is fixedly equipped with a feeding pipe, the top of the feeding pipe is equipped with a detachable sealing cap, and the bottom of the mixing tank is funnel-shaped, so that the material gathers towards the discharge pipe under the action of gravity.

[0011] Furthermore, a fixing frame is fixedly provided at the outer end of the central tube, the central airbag is located inside the fixing frame, and multiple stirring rods are fixedly provided on both sides of the fixing frame.

[0012] Furthermore, the central airbag is equipped with scrapers at both the front and rear. One side of the scraper contacts the inner wall of the mixing tank. The side of the scraper facing the inner wall of the mixing tank is arc-shaped. The side of the scraper facing the central airbag is equipped with two detachable connecting arms. One end of the connecting arm is fixedly connected to the outer end of the central tube.

[0013] Furthermore, the two connecting arms on the scraper are located at the top and bottom of the fixed frame, respectively. There are a total of four connecting arms on the two scrapers, two of which are located below the fixed frame. The bottom two connecting arms are fixed with brushes at their bottom ends, and the bottom ends of the brushes are in contact with the bottom of the mixing tank.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. The pressure control component continuously inflates and deflates the central air bladder while stirring, causing the central air bladder to constantly switch between an expanded and deflated state. When the central air bladder changes from an expanded to a deflated state, the material scraped off the inner wall of the mixing tank will move towards the center of the mixing tank, so that the material can be more thoroughly stirred, making the material more uniformly mixed. In addition, the material will be away from the inner wall of the mixing tank, preventing it from adhering to the inner wall of the mixing tank again.

[0016] 2. During the expansion and contraction of the central air bladder, the material is affected by the central air bladder, and its height inside the mixing tank changes continuously, causing the material to move longitudinally. The longitudinal movement, combined with the transverse stirring of the fixed frame, makes the material more evenly mixed. Attached Figure Description

[0017] Figure 1 This is a front view of the present invention.

[0018] Figure 2 This is a rear view structural diagram of the present invention;

[0019] Figure 3 This is a diagram showing the internal structure of the mixing tank of this utility model;

[0020] Figure 4 This is a top sectional view of the scraper of this utility model;

[0021] Figure 5 This is a diagram showing the internal structure of the central airbag of this utility model;

[0022] Figure 6 This is a structural diagram of the pressure control component of this utility model;

[0023] Figure 7 This is a cross-sectional view of the sleeve of this utility model.

[0024] The following is a list of component names represented by the various reference numerals in the attached figures:

[0025] 1. Mixing tank; 101. Top cover; 102. Feeding pipe; 103. Base; 104. Vertical plate; 105. Discharge pipe; 2. Pressure control assembly; 201. Protrusion; 202. Inner cavity; 203. Air guide pipe; 204. Hydraulic cylinder; 205. Pad plate; 206. Rubber pad; 3. Motor; 4. Fixed bracket; 5. Central tube; 501. Fixed frame; 502. Stirring rod; 503. Lower vent; 504. Upper vent; 6. Central airbag; 7. Scraper; 8. Connecting arm; 9. Brush; 10. Sleeve. Detailed Implementation

[0026] The preferred embodiments of this utility model are described in detail below, and a clear and complete explanation is given in conjunction with the accompanying drawings.

[0027] Please see Figures 1-7 This utility model provides an injection molding material mixing device, including a mixing tank 1, the top of the mixing tank 1 is provided with a detachable top cover 101, the mixing tank 1 is provided with a central tube 5 inside, both ends of the central tube 5 are closed, and a central airbag 6 is fixedly provided at the outer end of the central tube 5.

[0028] The mixing tank 1 is fixedly provided with a discharge pipe 105 with a valve at the bottom end. The mixing tank 1 is provided with a base 103 at the bottom. The base 103 is fixedly provided with two upright plates 104 at the top. The tops of the two upright plates 104 extend to both sides of the mixing tank 1 and are fixedly connected to the mixing tank 1. The top of the top cover 101 is fixedly provided with a feeding pipe 102. The top of the feeding pipe 102 is provided with a detachable sealing cover. The sealing cover is opened when feeding and closed at other times, thereby isolating the mixing tank 1 from the outside. The bottom of the mixing tank 1 is funnel-shaped, so that the material gathers towards the discharge pipe 105 under the action of gravity. The base 103 and the upright plates 104 provide support for the mixing tank 1 so that there is enough space below the mixing tank 1 for material discharge.

[0029] Weigh out the raw materials and other auxiliary materials for injection molding according to the mixing ratio, and put them into the mixing tank 1 through the feeding pipe 102. The raw materials and other auxiliary materials are collectively referred to as materials. The mixing tank 1 should not be filled with materials. The materials can only occupy up to 80% of the space inside the mixing tank 1. Stir and mix these materials evenly inside the mixing tank 1 so that the quality of the product made by subsequent injection molding is better. After the stirring work is completed, open the valve on the discharge pipe 105. Under the action of gravity, the materials are automatically discharged out through the discharge pipe 105, completing the mixing work.

[0030] In order to agitate the material to the inner wall of mixing tank 1, such as Figure 2 , Figure 3 , Figure 5 , Figure 6 As shown, the outer end of the central tube 5 is provided with a plurality of lower vent holes 503 located inside the central air bladder 6. The central air bladder 6 communicates with the interior of the central tube 5 through the lower vent holes 503. The central air bladder 6 is not elastic. The rear side of the mixing tank 1 is provided with a pressure control component 2 for controlling the air pressure of the central tube 5 and the central air bladder 6.

[0031] The pressure control assembly 2 includes a protrusion 201 fixedly disposed on the rear side of the mixing tank 1. The bottom end of the protrusion 201 has an inner cavity 202. The top end of the protrusion 201 is fixedly provided with a vent pipe 203 communicating with the inside of the inner cavity 202. A pad 205 is provided inside the protrusion 201. A rubber pad 206 is fixedly provided at the top end of the pad 205. The outer end of the rubber pad 206 contacts the inner wall of the inner cavity 202. A hydraulic cylinder 204 is provided at the bottom of the protrusion 201. The top end of the piston rod of the hydraulic cylinder 204 extends into the inner cavity 202 and is fixedly connected to the bottom end of the pad 205. The bottom end of the hydraulic cylinder 204 is connected to the top end of the base 103.

[0032] During the mixing process, the hydraulic cylinder 204 extends and retracts continuously, completing one extension and retraction every 5 seconds. When the piston rod of the hydraulic cylinder 204 extends, it pushes the pad 205 and the rubber pad 206 upward, thereby squeezing the air inside the inner cavity 202. The compressed air enters the central tube 5 through the air guide pipe 203 and finally enters the central air bladder 6 through the lower vent 503, causing the central air bladder 6 to expand. After the central air bladder 6, located in the center of the mixing tank 1, expands, it occupies part of the space inside the mixing tank 1, thereby pushing the material from the center of the mixing tank 1 to the outside. For this reason, the mixing tank 1 should not be filled with material, so as to leave space for the expansion of the central air bladder 6.

[0033] When the piston rod of the hydraulic cylinder 204 retracts, the pad 205 and the rubber pad 206 move down, drawing the air back into the inner cavity 202. The central air bladder 6, from which the air has been drawn out, becomes deflated. At this time, the material moves back into the space occupied by the central air bladder 6 when it expands, that is, from the position near the inner wall of the mixing tank 1 to the center of the mixing tank 1. This causes the material scraped off the inner wall of the mixing tank 1 to move closer to the center of the mixing tank 1, thus being more thoroughly stirred and making the material more evenly mixed. Furthermore, because the material on the inner wall of the mixing tank 1 moves towards the center, it will move away from the inner wall of the mixing tank 1, preventing it from adhering to the inner wall of the mixing tank 1 again.

[0034] In order to ensure that the materials inside mixing tank 1 are mixed evenly, such as Figure 2 , Figure 3 , Figure 6As shown, the top of the top cover 101 is provided with a fixed bracket 4, and a motor 3 for driving the rotation of the central tube 5 is fixedly provided at the top of the fixed bracket 4. A sleeve 10 is fixedly provided at the bottom of the fixed bracket 4. One end of the air guide pipe 203 is fixedly connected to the rear side of the sleeve 10 and communicates with the inside of the sleeve 10. The top end of the central tube 5 passes through the top cover 101 and extends into the inside of the sleeve 10. The central tube 5 is movably connected to the top cover 101 and the sleeve 10 through a sealed bearing. The top end of the central tube 5 passes through the fixed bracket 4 and is fixedly connected to the output shaft of the motor 3. The outer end of the central tube 5 is provided with multiple upper vent holes 504 located inside the sleeve 10. The central tube 5 communicates with the inside of the sleeve 10 through the upper vent holes 504. When the air in the inner cavity 202 is compressed, it enters the sleeve 10 through the air guide pipe 203 and then enters the central tube 5 through the upper vent holes 504. Similarly, when the hydraulic cylinder 204 contracts, the air in the central airbag 6 also returns to the inner cavity 202 through the above path.

[0035] A fixing frame 501 is fixedly provided at the outer end of the central tube 5, the central airbag 6 is located inside the fixing frame 501, and multiple stirring rods 502 are fixedly provided on both sides of the fixing frame 501.

[0036] When mixing materials, the motor 3 drives the central tube 5 to rotate, which in turn drives the fixed frame 501 and stirring rod 502 at the outer end of the central tube 5 to rotate. During the rotation, the fixed frame 501 and stirring rod 502 contact and mix the materials, thereby making the various components of the materials evenly mixed. The mixing time is not less than 5 minutes. The rotation plane of each fixed frame 501 is horizontal, so the materials can only be mixed in the horizontal direction. The central air bladder 6 continuously expands and contracts during the mixing process. When it expands, it occupies the internal space of the mixing tank 1 and squeezes the materials, making the height of the materials inside the mixing tank 1 higher. Conversely, when the central air bladder 6 is deflated, the materials return to the initial state and the height decreases. Therefore, the expansion and contraction of the central air bladder 6 not only makes the materials move laterally between the inner wall and the center of the mixing tank 1, but also makes the materials move longitudinally. The longitudinal movement, combined with the lateral stirring of the fixed frame 501, makes the materials more evenly mixed.

[0037] While stirring, it is necessary to scrape off the material adhering to the inner wall of mixing tank 1, such as... Figure 3 , Figure 4 As shown, scrapers 7 are provided at both the front and rear of the central airbag 6. The scrapers 7 are made of tough hard rubber material. One side of the scraper 7 is in contact with the inner wall of the mixing tank 1. The side of the scraper 7 facing the inner wall of the mixing tank 1 is arc-shaped. The side of the scraper 7 facing the central airbag 6 is provided with two detachable connecting arms 8. One end of the connecting arm 8 is fixedly connected to the outer end of the central tube 5.

[0038] The two connecting arms 8 on the scraper 7 are located at the top and bottom of the fixed frame 501, respectively. There are a total of four connecting arms 8 on the two scrapers 7. Two of the connecting arms 8 are located below the fixed frame 501. The bottom ends of the two connecting arms 8 at the bottom are fixed with brushes 9. The bottom ends of the brushes 9 are in contact with the bottom of the mixing tank 1. When the connecting arms 8 rotate, they drive the brushes 9 to rub against the bottom of the mixing tank 1, thereby brushing off the material attached there. The material brushed off there will naturally move along the funnel-shaped bottom end of the mixing tank 1 towards the middle of the mixing tank 1.

[0039] When the central tube 5 rotates, it drives the connecting arm 8 to rotate, which in turn drives the scraper 7 to rotate. The direction of curvature on one side of the scraper 7 is the same as the direction of rotation of the central tube 5. Therefore, the scraper 7 rubs against the inner wall of the mixing tank 1 during rotation, scraping off the material adhering to the inner wall of the mixing tank 1. As the scraper 7 moves, the material hanging off will be pushed by the scraper 7. Since one side of the scraper 7 is arc-shaped and the direction of curvature is the same as the direction of rotation of the scraper 7, the pushed material will move along the curved part of the scraper 7. This makes the material gradually move away from the inner wall of the mixing tank 1, thereby further preventing the material from adhering to the inner wall of the mixing tank 1 again and avoiding increasing the difficulty of scraping off the material.

[0040] Based on the above description and accompanying drawings, those skilled in the art can understand and implement this utility model. Furthermore, any non-creative modifications made to this utility model by those skilled in the art without inventive effort are still within the protection scope of this utility model.

Claims

1. A device for preparing injection molding material, comprising a preparation tank (1) provided with a detachable top cover (101) at the top end, characterized in that: The inside of the deployment tank (1) is provided with a center pipe (5), and the outer end of the center pipe (5) is fixedly provided with a center air bag (6); A plurality of lower air holes (503) are formed in the outer end of the center pipe (5) and located in the center air bag (6), the center air bag (6) is communicated with the inside of the center pipe (5) through the lower air holes (503), and the rear side of the deployment tank (1) is provided with a pressure control assembly (2) for controlling the air pressure of the center pipe (5) and the center air bag (6).

2. A device for blending injection molding material according to claim 1, wherein: The pressure control assembly (2) comprises a protrusion (201) fixedly arranged on the rear side of the deployment tank (1), an inner cavity (202) is formed in the bottom end of the protrusion (201), a gas guide pipe (203) is fixedly arranged on the top end of the protrusion (201) and communicated with the inside of the inner cavity (202), a backing plate (205) is arranged in the protrusion (201), a rubber pad (206) is fixedly arranged on the top end of the backing plate (205), and a hydraulic cylinder (204) is arranged on the bottom of the protrusion (201), the piston rod top end of the hydraulic cylinder (204) extends into the inner cavity (202) and is fixedly connected with the bottom end of the backing plate (205).

3. A device for blending injection molding material as defined in claim 2, wherein: The top end of the top cover (101) is provided with a fixed support (4), the top end of the fixed support (4) is fixedly provided with a motor (3) for driving the center pipe (5) to rotate, the bottom end of the fixed support (4) is fixedly provided with a sleeve (10), one end of the gas guide pipe (203) is fixedly connected with the rear side of the sleeve (10) and communicated with the inside of the sleeve (10), the top end of the center pipe (5) penetrates through the top cover (101) and extends into the inside of the sleeve (10), and a plurality of upper air holes (504) are formed in the outer end of the center pipe (5) and located in the inside of the sleeve (10).

4. The injection material blending device of claim 2, wherein: The bottom end of the deployment tank (1) is fixedly provided with a discharge pipe (105) with a valve, the bottom of the deployment tank (1) is provided with a base (103), the bottom end of the hydraulic cylinder (204) is connected with the top end of the base (103), the top end of the base (103) is fixedly provided with two vertical plates (104), the top ends of the two vertical plates (104) respectively extend to the two sides of the deployment tank (1) and are fixedly connected with the deployment tank (1), and the top end of the top cover (101) is fixedly provided with a feeding pipe (102).

5. The injection material blending device of claim 1, wherein: The outer end of the center pipe (5) is fixedly provided with a fixed frame (501), the center air bag (6) is located in the inside of the fixed frame (501), and a plurality of stirring rods (502) are fixedly arranged on the two sides of the fixed frame (501).

6. A device for blending injection molding material as defined in claim 5, wherein: The center air bag (6) is provided with a scraper (7) in front and back, one side of the scraper (7) is in contact with the inner wall of the deployment tank (1), the side of the scraper (7) facing the inner wall of the deployment tank (1) is arc-shaped, the side of the scraper (7) facing the center air bag (6) is provided with two detachable connecting arms (8), and one end of the connecting arm (8) is fixedly connected with the outer end of the center pipe (5).

7. A device for blending injection molding material as defined in claim 6, wherein: The two connecting arms (8) on the scraper (7) are respectively located at the top and bottom of the fixed frame (501), the bottom ends of the two connecting arms (8) are fixedly provided with a brush (9), and the bottom end of the brush (9) is in contact with the bottom end of the inside of the deployment tank (1).

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