A ball dispensing device and a rotational molding machine composed thereof

Abstract

This application relates to a ball-feeding device and a rotational molding machine composed thereof, belonging to the field of rotational molding technology. The ball-feeding device includes a connecting assembly, a collection box, an upward channel, and a return box. The upper and lower ends of the side wall of the upward channel are respectively provided with horizontally arranged discharge ports and inlets. The discharge port is connected to the collection box, and the inlet is connected to the return box. A hopper is slidably arranged inside the upward channel. The bottom of the collection box is connected to the connecting assembly, and the upper end of the return box is connected to the connecting assembly. The connecting assembly is detachably connected to the filling port of the rotational molding mold. In the final stage of the rotational molding process, this application uses the ball-feeding device to add grinding and polishing balls to the inside of the product to grind and polish the interior of the product, thereby improving the density and smoothness of the inner wall.

Description

Technical Field

[0001] This application belongs to the field of rotational molding technology, specifically relating to a ball dispensing device and a rotational molding machine composed thereof. Background Technology

[0002] Rotational molding is a processing method that uses a rotating mold to process plastics. The process involves putting plastic powder or slurry into the mold, which is then closed and rotated or oscillated on the equipment. At the same time, the outside of the mold is heated by an open flame or hot air. Under the heat, the plastic powder or slurry tumbles and flows inside the mold. Once the temperature reaches its softening point, it is gradually coated onto the inner surface of the mold, melts and solidifies. The mold is then placed in a natural environment or cooled by media such as water, mist, or wind before the mold is removed and the product is taken out.

[0003] Rotational molding products are generally hollow products with uniform wall thickness. However, existing technologies for obtaining rotational molding products with uneven wall thickness have many defects, such as indistinct wall thickness gradient, unstable center of gravity, and material shortage. At the same time, existing rotational molding processes are difficult to obtain rotational molding products with dense internal structure and high internal surface smoothness. Defects such as air bubbles and uneven wall thickness exist inside the product, and the molding efficiency and dimensional accuracy are low.

[0004] Therefore, there is an urgent need to provide a rotational molding machine that can improve the density and surface finish of rotational molded products, so as to obtain rotational molded products with dense internal structure and high surface finish, shorten the rotational molding time, reduce energy consumption, power consumption, and material consumption, and improve production efficiency. Utility Model Content

[0005] The technical problem to be solved by this application is to overcome the shortcomings of the prior art and provide a ball feeding device and a rotational molding machine composed therefrom. In the final stage of the rotational molding process, the ball feeding device adds rolling and polishing balls to the inside of the product to roll and polish the inside of the product, thereby improving the density of the product and the smoothness of the inner wall.

[0006] The technical solution adopted in this application to solve the problems existing in the prior art is:

[0007] A ball dispensing device includes a connecting assembly, a collection bin, an upward channel, and a return bin.

[0008] The upper and lower ends of the side wall of the upward channel are respectively provided with horizontally arranged discharge port and inlet port. The discharge port is connected to the collection box and the inlet port is connected to the return box. The hopper is slidably arranged inside the upward channel.

[0009] The bottom of the collection box is connected to a connecting assembly, and the top of the return box is also connected to a connecting assembly.

[0010] The connection assembly is detachably connected to the filling port of the rotational molding mold.

[0011] Preferably, the hopper includes a hopper body with an open upper end, the hopper body being open on the side facing the discharge port and the inlet port, and an inclined plate is rotatably provided at the open end. The inclined plate is connected to the hopper body through a third telescopic cylinder. The third telescopic cylinder controls the rotation, opening and closing of the inclined plate, and the inclined plate is retracted to seal the open end of the hopper body.

[0012] Preferably, the upward channel is provided with a vertically arranged linear module, and the sliding component on the linear module is fixedly connected to the hopper.

[0013] Preferably, the connecting assembly includes a fixed tube, and the fixed tube is coaxially provided with an insert tube that is slidably connected to it. The fixed tubes of the two connecting assemblies are fixedly connected to the collection box and the return box.

[0014] The fixed tube is externally fixed with a first telescopic cylinder, and the first telescopic rod of the first telescopic cylinder is fixedly connected to the outer wall of the insertion tube.

[0015] Preferably, the bottom surface of the collection box is provided with a through hole, which is connected to the fixed pipe. A sealing plate is provided inside the through hole. A second telescopic cylinder is fixedly connected to the collection box, and the second telescopic rod of the second telescopic cylinder is vertically fixedly connected to the sealing plate.

[0016] Preferably, the bottom of the fixed pipe of the lower connecting assembly is connected to a material distribution box, and the material distribution box is equipped with a material separation device, which separates the grinding and polishing balls from the product powder that enter the material distribution box.

[0017] The bottom of the material distribution box is connected to a grinding and polishing ball discharge pipe and a powder discharge pipe, and the polishing ball discharge pipe is connected to the return material box.

[0018] A rotational molding machine includes the aforementioned ball feeding device and a rotational molding machine body, wherein the upward channel of the ball feeding device is disposed on the outside of the rotational molding machine body.

[0019] Preferably, the rotational molding die filling port of the rotational molding machine mold is connected to the ball feeding device assembly.

[0020] Preferably, the outer end face is provided with several grooves arranged around the filling port of the rotational molding die, a connecting pipe is coaxially fixed above the filling port of the rotational molding die, and several triangular plates are arranged in a spliced ​​manner inside the filling port of the rotational molding die. After the triangular plates are spliced ​​together, the filling port of the rotational molding die can be sealed.

[0021] A slider is fixed on the side of the triangular plate away from the axis of the filling port of the rotational molding mold. The slider is slidably set inside the groove. The top of the slider is provided with an inclined surface, which gradually decreases towards the triangular plate. A second spring is provided on the side of the slider away from the triangular plate.

[0022] The connector tube is inserted into the connecting tube. A vertically arranged pressure rod is fixed on the outer wall of the connector tube. The pressure rod is pressed down and contacts the inclined surface, pushing the inclined surface away from the axis of the rotational molding mold filling port, thereby pushing the triangular plate outward and opening the rotational molding mold filling port.

[0023] Compared with the prior art, the beneficial effects of this application are as follows:

[0024] (1) Obtaining rotational molded products with dense internal structure and high surface smoothness effectively solves the problems of defects such as air bubbles and uneven wall thickness in the products in the prior art; due to the increase in material density, the time required for rotational molding can be significantly shortened, the energy consumption, power consumption and material consumption of heating can be reduced, and the production efficiency can be improved.

[0025] (2) The method of this utility model is simple and easy to operate. It does not require major modifications to the existing rotational molding equipment and can be well integrated with the existing process, and has good industrial application prospects. Attached Figure Description

[0026] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0027] Figure 1 This is a structural diagram of the sphere delivery device in this application.

[0028] Figure 2 This is a structural diagram of the filling port of the rotational molding die in this application.

[0029] Figure 3 for Figure 2 sectional view,

[0030] Figure 4 This is a structural diagram of the internal sealing assembly of the filling port in the rotational molding die in this application.

[0031] Figure 5 This is a structural diagram of the internal locking tube of the filling port in the rotational molding die in this application.

[0032] Figure 6 This is a structural diagram showing the connection between the connecting assembly and the filling port of the rotational molding die in the ball dispensing device of this application.

[0033] Figure 7 for Figure 6 Sectional view,

[0034] Figure 8 This is a cross-sectional view of the feeding assembly in the ball dispensing device of this application.

[0035] Figure 9 This is a structural diagram of the receiving end of the ball dispensing device in this application.

[0036] Figure 10 for Figure 9 Sectional view,

[0037] Figure 11 for Figure 10 Enlarged view of a portion of point A in the middle.

[0038] Figure 12 This is a structural diagram of the hopper in the sphere dispensing device of this application.

[0039] Figure 13 This is a schematic diagram of the bottom of the hopper.

[0040] Figure 14 This is a structural diagram after the hopper is opened.

[0041] In the diagram: 1-Rotomolding mold filling port, 101-Slide groove, 2-Connecting pipe, 201-Slide opening, 202-Spring top plate, 3-Positioning pipe, 301-Spring base, 4-First spring, 5-Lever, 6-Bracket, 7-Triangle plate, 701-Snap ring, 702-Slider, 703-Inclined surface, 8-Second spring, 9-Insertion tube, 901-Cut edge, 902-Pressure rod, 903-Slide rod, 10-Fixing pipe, 1001-Limiting slide groove, 11-First telescopic cylinder, 1101-First telescopic rod, 12-Collection box 13-Sealing plate, 14-Second telescopic cylinder, 1401-Second telescopic rod, 15-Upward channel, 1501-Discharge port, 1502-Inlet port, 1503-Vertical chute, 1504-Baffle, 1505-Third spring, 16-Linear module, 17-Hopper, 1701-Hopper body, 1702-Inclined plate, 1703-Front end pressure plate, 1704-Third telescopic cylinder, 18-Return box, 19-Discharge channel, 20-Rolling and polishing ball discharge pipe, 21-Powder discharge pipe, 22-Distribution box. Detailed Implementation

[0042] The present application provides a detailed description of a ball dispensing device and a rotational molding machine composed thereof, in conjunction with the accompanying drawings, but this is not intended to limit the scope of the application.

[0043] Depend on Figures 1 to 14 As shown, a ball dispensing device includes a connecting assembly, a collection box 12, an upward channel 15, and a return box 18.

[0044] The upper moving channel 15 has a horizontally arranged discharge port 1501 and a feed port 1502 at its upper and lower ends on its side wall, respectively. The discharge port 1501 is connected to the collection box 12, and the feed port 1502 is connected to the return box 18. A hopper 17 is slidably arranged inside the upper moving channel 15. Specifically, a vertically arranged linear module 16 is provided inside the upper moving channel 15, and the sliding component on the linear module 16 is fixedly connected to the hopper 17.

[0045] The hopper 17 includes a hopper body 1701 with an open upper end. The hopper body 1701 is open on the side facing the discharge port 1501 and the inlet port 1502. An inclined plate 1702 is rotatably provided at the open end. The inclined plate 1702 is connected to the hopper body 1701 through a third telescopic cylinder 1704. The third telescopic cylinder 1704 controls the rotation, opening and closing of the inclined plate 1702. The inclined plate 1702 retracts to seal the open end of the hopper body 1701. One end of the third telescopic cylinder 1704 is hinged to the bottom of the hopper body 1701, and the end of its movable part, the third telescopic rod, is hinged to the bottom of the inclined plate 1702 and slidably connected.

[0046] The bottom of the collection box 12 is connected to a connecting assembly, and the top of the return box 18 is connected to a connecting assembly.

[0047] The connecting assembly is detachably connected to the filling port 1 of the rotational molding mold. The connecting assembly includes a fixing tube 10, and the fixing tube 10 has a slidingly connected insert tube 9 coaxially arranged inside it. The fixing tubes 10 of the two connecting assemblies are fixedly connected to the collection box 12 and the return box 18.

[0048] The fixed tube 10 is externally fixed with a first telescopic cylinder 11, and the first telescopic rod 1101 of the first telescopic cylinder 11 is fixedly connected to the outer wall of the insertion tube 9.

[0049] The bottom surface of the collection box 12 is provided with a through hole, which is connected to the fixed pipe 10. A sealing plate 13 is provided inside the through hole. A second telescopic cylinder 14 is fixedly connected to the collection box 12. The second telescopic rod 1401 of the second telescopic cylinder 14 is vertically fixedly connected to the sealing plate 13.

[0050] The bottom of the fixed pipe 10 of the lower connecting assembly is connected to the material distribution box 22. The material distribution box 22 is equipped with a material separation device, which separates the grinding and polishing balls from the product powder that enter the material distribution box 22.

[0051] The bottom of the material distribution box 22 is connected to the grinding and polishing ball discharge pipe 20 and the powder discharge pipe 21. The polishing ball discharge pipe 20 is connected to the return material box 18.

[0052] In this embodiment, the material distribution box 20 is equipped with a partition, and the grinding and polishing ball discharge pipe 20 and the powder discharge pipe 21 are located on both sides of the partition. The material separation device includes an air jet pipe, which uses airflow to separate the grinding and polishing balls from the product powder.

[0053] The return material box 18 is connected to the feed inlet 1502 via an inclined discharge channel 19, allowing the feed inlet 1502 to close automatically after the hopper 17 moves upward. A vertical chute 1503 is located below the bottom surface of the feed inlet 1502, and a baffle 1504 slides vertically inside the vertical chute 1503. A third spring 1505 is located below the baffle 1504. A front pressure plate 1703 is located at the top front end of the inclined plate 1702. When the hopper 17 moves downward, the front pressure plate 1703 abuts against the top surface of the baffle 1504, pressing down the baffle 1504 and opening the feed inlet 1502. When the hopper 17 moves upward, the baffle 1504 moves upward under the action of the third spring 1505, blocking the feed inlet 1502.

[0054] A rotational molding machine includes a rotational molding machine body and the aforementioned ball feeding device. The rotational molding machine body is existing technology and can be directly purchased from the market. The upward channel 15 of the ball feeding device is located on the outside of the rotational molding machine body.

[0055] To accommodate the connecting assembly, the mold of the rotational molding machine is modified. The outer end face of the rotational molding mold filling port 1 has several grooves 101 arranged around it. A connecting pipe 2 is coaxially fixed above the filling port 1. Several vertically arranged sliding openings 201 are provided on the outer wall of the connecting pipe 2, and a spring top plate 202 is provided above each sliding opening 201. Inside the filling port 1, several interlocking triangular plates 7 are provided. When the triangular plates 7 are assembled, they can seal the filling port 1.

[0056] A slider 702 is fixed to the side of the triangular plate 7 away from the axis of the filling port 1 of the rotational molding mold. The slider 702 is slidably disposed inside the slide groove 101. The top of the slider 702 is provided with an inclined surface 703, which gradually decreases towards the triangular plate 7. A second spring 8 is provided on the side of the slider 702 away from the triangular plate 7.

[0057] To limit the position of the triangle plate 7 after it is assembled and further optimize its fixing effect, in this embodiment, the top surface of the triangle plate 7 is provided with a retaining ring 701. After the triangle plate 7 is assembled, all the open rings 701 are spliced ​​together to form an annular groove.

[0058] The connecting pipe 2 has a locking tube 3 that slides up and down inside. A spring base 301 is fixed to the outside of the locking tube 3. The spring base 301 is slidably disposed inside the sliding opening 201. A first spring 4 is provided between the spring base 301 and the spring top plate 202.

[0059] A bracket 6 is fixed on the outer end face of the filling port 1 of the rotational molding die. A lever 5 is rotatably connected to the bracket 6, and one end of the lever 5 is located at the bottom of the spring base 301.

[0060] The insertion tube 9 of the connecting assembly is inserted into the interior of the connecting tube 2, and its outer diameter is smaller than the inner diameter of the locking tube 3. A vertically arranged pressure rod 902 is fixed on the outer wall of the insertion tube 9. The pressure rod 902 is pressed down to contact the inclined surface 703, pushing the inclined surface 703 away from the axis of the rotational molding mold filling port 1, thereby pushing the triangular plate 7 to move outward and opening the rotational molding mold filling port 1.

[0061] During the downward movement of the pressure rod 902, it first contacts the lever 5, causing the lever 5 located below the spring base 301 to move upward, pushing the locking tube 3 upward, causing the locking tube 3 to be removed from the inside of the retaining ring 701, thus releasing the lock on the triangular plate 7.

[0062] The insertion tube 9 is provided with a slide rod 903 on the outside, and the slide rod 903 is slidably disposed inside the limiting slide groove 1001 of the fixed tube 10.

[0063] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A sphere delivery device, characterized in that: Includes a connecting assembly, a collection box (12), an upward channel (15), and a return box (18); The upper and lower ends of the side wall of the upward channel (15) are respectively provided with a horizontally arranged discharge port (1501) and a feed port (1502). The discharge port (1501) is connected to the collection box (12), and the feed port (1502) is connected to the return box (18). The hopper (17) is slidably provided inside the upward channel (15). The bottom of the collection box (12) is connected to a connecting assembly, and the top of the return box (18) is connected to a connecting assembly. The connection assembly is detachably connected to the filling port (1) of the rotational molding mold.

2. The sphere delivery device according to claim 1, characterized in that: The hopper (17) includes a hopper body (1701) with an open top. The hopper body (1701) is open on the side facing the discharge port (1501) and the inlet port (1502). An inclined plate (1702) is rotatably provided at the open. The inclined plate (1702) is connected to the hopper body (1701) through a third telescopic cylinder (1704). The third telescopic cylinder (1704) controls the inclined plate (1702) to rotate and open and close. The inclined plate (1702) is retracted to seal the open front end of the hopper body (1701).

3. The sphere delivery device according to claim 2, characterized in that: The upward channel (15) is provided with a vertically arranged linear module (16), and the sliding component on the linear module (16) is fixedly connected to the hopper (17).

4. A sphere delivery device according to claim 1, 2, or 3, characterized in that: The connection assembly includes a fixed tube (10), and the fixed tube (10) is coaxially provided with a slidably connected insertion tube (9) inside. The fixed tubes (10) of the two connection assemblies are fixedly connected to the collection box (12) and the return box (18). The fixed tube (10) is externally fixed with a first telescopic cylinder (11), and the first telescopic rod (1101) of the first telescopic cylinder (11) is fixedly connected to the outer wall of the insertion tube (9).

5. A sphere delivery device according to claim 4, characterized in that: The bottom surface of the collection box (12) is provided with a through hole, which is connected to the fixed pipe (10). A sealing plate (13) is provided inside the through hole. A second telescopic cylinder (14) is fixedly connected to the collection box (12). The second telescopic rod (1401) of the second telescopic cylinder (14) is vertically fixedly connected to the sealing plate (13).

6. The sphere delivery device according to claim 5, characterized in that: The bottom of the fixed pipe (10) of the lower connecting assembly is connected to a material distribution box (22). The material distribution box (22) is equipped with a material separation device, which separates the grinding and polishing balls that enter the material distribution box (22) from the product powder. The bottom of the material distribution box (22) is connected to the grinding and polishing ball discharge pipe (20) and the powder discharge pipe (21), and the polishing ball discharge pipe (20) is connected to the return box (18).

7. A rotational molding machine, comprising a ball feeding device as described in claim 1, 2, 3, 5, or 6, characterized in that: The upper channel (15) of the ball feeding device, including the rotational molding machine body, is located on the outside of the rotational molding machine body.

8. A rotational molding machine according to claim 7, characterized in that: The rotational molding die filling port (1) of the rotational molding machine mold is connected to the ball feeding device assembly.

9. A rotational molding machine according to claim 8, characterized in that: The outer end face is provided with several grooves (101) arranged around the rotomolding mold filling port (1). A connecting pipe (2) is fixed coaxially above the rotomolding mold filling port (1). Several triangular plates (7) are arranged in a spliced ​​manner inside the rotomolding mold filling port (1). After the triangular plates (7) are spliced ​​together, the rotomolding mold filling port (1) can be sealed. A slider (702) is fixed on the side of the triangle plate (7) away from the axis of the filling port (1) of the rotational molding mold. The slider (702) is slidably disposed inside the groove (101). The top of the slider (702) is provided with an inclined surface (703). The inclined surface (703) gradually decreases towards the triangle plate (7). A second spring (8) is provided on the side of the slider (702) away from the triangle plate (7). The insertion tube (9) of the connecting assembly is inserted into the inside of the connecting tube (2). A vertically arranged pressure rod (902) is fixed on the outer wall of the insertion tube (9). The pressure rod (902) is pressed down and contacts the inclined surface (703), pushing the inclined surface (703) away from the axis of the rotational molding mold filling port (1), thereby pushing the triangular plate (7) to move outward and opening the rotational molding mold filling port (1).

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