Extrusion mechanism of injection molding machine

Abstract

The utility model discloses an extrusion mechanism of an injection molding machine and relates to the technical field of injection molding machines. According to the technical scheme, the extrusion device is characterized by comprising an extrusion rod and a charging barrel fixedly connected to the top face of the extrusion rod, the charging barrel is communicated with the interior of the extrusion rod, a collecting box is fixedly connected to the inner wall of the charging barrel, the top face of the collecting box is higher than the middle point of the charging barrel in the height direction, and a pressed plate is slidably connected into the collecting box; an outflow opening communicated with the collecting box is formed in the peripheral wall of the charging barrel, an additional pipe is fixedly connected to the peripheral wall of the outflow opening, the bottom face of the additional pipe is communicated with the interior of the extrusion rod, and after plastic particles exist on the top face of the pressed plate, the charging barrel is communicated with the additional pipe; according to the utility model, the discharge pressure of the discharge pipe of the charging barrel is shared by the additional pipe, so that enough plastic particles always enter the extrusion rod, and the extrusion efficiency of the extrusion mechanism is ensured.

Description

Technical Field

[0001] This utility model relates to the field of injection molding machine technology, and more specifically, to an extrusion mechanism for an injection molding machine. Background Technology

[0002] Injection molding machines are molding equipment used to form various shapes of plastic products from thermoplastic or thermosetting plastics using plastic molds.

[0003] The extrusion mechanism of an injection molding machine is a device that melts plastic granules and injects them into the mold cavity through a screw. It typically consists of a feeding device, a barrel, a screw, and a nozzle. To ensure that the plastic granules are completely melted in the mechanism, the plastic granules in the barrel are preheated. At this time, some of the plastic granules melt in the barrel and come into contact with the screw along the discharge port of the barrel.

[0004] After the injection molding machine is used, some molten liquid will stick to the discharge port of the barrel. As the temperature decreases, this liquid will solidify again. As the injection molding machine is used for a longer period of time, the amount of solidified plastic on the discharge port will increase, thereby reducing the diameter of the discharge port and slowing down the feeding efficiency. Therefore, a structure is designed to solve the problem of solidified plastic blocking the discharge port. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an extrusion mechanism for an injection molding machine, which improves the overall extrusion efficiency of the mechanism through structural design.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: An injection molding machine extrusion mechanism includes an extrusion rod and a barrel fixedly connected to the top surface of the extrusion rod. The barrel is internally connected to the extrusion rod. A collection box is fixedly connected to the inner wall of the barrel. The top surface of the collection box is higher than the midpoint of the barrel in the height direction. A pressure plate is slidably connected inside the collection box. An outlet communicating with the collection box is opened on the outer peripheral wall of the barrel. An auxiliary pipe is fixedly connected to the outer peripheral wall of the outlet. The bottom surface of the auxiliary pipe is internally connected to the extrusion rod. When plastic particles are present on the top surface of the pressure plate, the barrel communicates with the auxiliary pipe.

[0007] The present invention is further configured such that: a plurality of elastic elements are fixedly connected to the inner bottom surface of the collection box, and the other end of the elastic elements is fixedly connected to the bottom surface of the pressure plate, wherein the supporting force of the elastic elements on the pressure plate is greater than the weight of the pressure plate.

[0008] The present invention is further configured such that: an inlet pipe is provided above the material cylinder, and the inlet pipe and the collection box are respectively located on both sides of the center line of the material cylinder, with part of the inlet pipe extending into the material cylinder.

[0009] The utility model further sets up: the additional pipe is close to the one end of extrusion pole and is equipped with sliding slot, sliding slot is connected with the plugging piece of having elastic deformation performance, the top surface of plugging piece and the top surface of pressure plate are fixedly connected through a plurality of pull ropes.

[0010] The utility model further sets up: one end of pull rope is fixedly connected in the one side of pressure plate close to the inner wall of material cylinder, a plurality of pull ropes are along the central axis of plugging piece length direction symmetry and set up.

[0011] The utility model further sets up: the one side of plugging piece away from pull rope is fixedly connected with a plurality of fixed ropes, the fixed rope has elastic deformation performance, and the other end of fixed rope is fixedly connected on the outer peripheral wall of material cylinder.

[0012] In conclusion, the utility model has following beneficial effect: if the solidified plastic particle is adhered on the inner wall of material cylinder, the channel of material cylinder is reduced, therefore when the feeding speed is greater than the discharging speed, the height of material in material cylinder is gradually increased and contacts pressure plate, at this moment, pressure plate is gradually moved down under the action of material pressure, along with the increase of pressure plate moving distance, the communication area of additional pipe and material cylinder is gradually increased, at this moment, the material in collecting box enters extrusion rod through additional pipe, guarantee the extrusion efficiency of structure. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the structural schematic diagram of the utility model;

[0014] Figure 2 It is the sectional view of the utility model;

[0015] Figure 3 It is Figure 2 The enlarged view of A part;

[0016] Figure 4 It is Figure 2 The enlarged view of B part.

[0017] In the drawing: 1, extrusion rod;2, material cylinder;3, collecting box;4, pressure plate;5, outlet;6, additional pipe;7, elastic part;8, feeding pipe;9, sliding slot;10, plugging piece;11, pull rope;12, fixed rope. DETAILED DESCRIPTION

[0018] The utility model is described in detail below in combination with the drawings and examples.

[0019] A kind of injection molding machine extrusion mechanism, such as Figures 1-3As shown, including extrusion rod 1 and fixedly connected on the top surface of the extrusion rod 1 barrel 2, barrel 2 and extrusion rod 1 inside communication, the outer wall of the extrusion rod 1 fixedly connected with several heating pipe, through the heating pipe to melt into the extrusion rod 1 plastic particles completely, the inner wall of the barrel 2 fixedly connected with the collection box 3, the top surface of the collection box 3 is higher than the barrel 2 height direction midpoint, when the inner wall of the barrel 2 discharge port gradually solidified with plastic particles, the cross section area of the barrel 2 discharge port will decrease, at this time the structure of the feed speed is greater than the discharge speed, the height of the barrel 2 material will gradually increase and enter the collection box 3, by lifting the top surface of the collection box 3 to avoid the barrel 2 normal height material can enter the collection box 3, barrel 2 above the setting of the inlet pipe 8, inlet pipe 8 and collection box 3 are respectively arranged on both sides of the barrel 2 center line, part of the inlet pipe 8 into the barrel 2, a large number of plastic particles through the inlet pipe 8 into the barrel 2 preheating operation, through the setting of the inlet pipe 8 and collection box 3 placement position to avoid the material of the inlet pipe 8 directly into the collection box 3, and the inlet pipe 8 close to the barrel 2 end into the barrel 2 in the guarantee of the material stable into the barrel 2 at the same time also can avoid the impurities in the air mixed into the material in the case.

[0020] As shown in Figure 1 and Figure 3 the collection box 3 is slidably connected with the pressure plate 4, the bottom surface of the collection box 3 is bonded with the elastic member 7, the elastic member 7 is set as a spring, the other end of the elastic member 7 is bonded on the bottom surface of the pressure plate 4, because the supporting force of the elastic member 7 to the pressure plate 4 is greater than the gravity of the pressure plate 4, therefore when there is no material contact with the pressure plate 4, the top surface of the pressure plate 4 and the bottom surface of the collection box 3 are located on the same horizontal plane, the outer wall of the barrel 2 is provided with the flow outlet 5 which is communicated with the collection box 3, the outer wall of the flow outlet 5 is welded with the additional pipe 6, the bottom surface of the additional pipe 6 is communicated with the inside of the extrusion rod 1, the width of the additional pipe 6 is smaller than the diameter of the discharge port of the barrel 2, so as to reduce the amount of material entering the extrusion rod 1 from the additional pipe 6, avoid a large amount of material entering the extrusion rod 1 at the same time which leads to the situation that it can not be completely melted, after the pressure plate 4 top surface exists plastic particles, the barrel 2 is communicated with the additional pipe 6, when the top surface height of the material in the barrel 2 is higher than the top surface of the collection box 3, part of the material in the barrel 2 will fall on the pressure plate 4 and exert pressure on the pressure plate 4, the pressure plate 4 will move downward under the driving of the material and exert the pressure on the elastic member 7 to make it compressed, with the downward movement of the pressure plate 4, the communication area of the flow outlet 5 and the additional pipe 6 with the collection box 3 gradually increases, at this time the material falling on the pressure plate 4 will enter the extrusion rod 1 along the flow outlet 5 and the additional pipe 6, by reducing the width of the additional pipe 6, to slow down the speed of the material in the collection box 3 completely flowing out, so as to ensure the balance of the amount of material entering the extrusion rod 1, with the gradual reduction of the material on the pressure plate 4, the pressure plate 4 will gradually move upward under the action of the elastic member 7 until it returns to the initial position.

[0021] As Figure 1 , Figure 3 and Figure 4 shown, the additional pipe 6 is provided with a sliding groove 9 near one end of the extrusion rod 1, and a sealing piece 10 with elastic deformation performance is slidably connected in the sliding groove 9. The sealing piece 10 is located near one end of the additional pipe 6 close to the extrusion rod 1, which can prevent the material entering the extrusion rod 1 from the discharge port of the barrel 2 from entering the barrel 2 when passing through the pipe opening of the additional pipe 6, affecting the injection efficiency. The top surface of the sealing piece 10 and the top surface of the pressure plate 4 are bonded by a plurality of pull ropes 11, one end of the pull rope 11 is bonded to one side of the pressure plate 4 close to the inner wall of the barrel 2, and a plurality of pull ropes 11 are symmetrically arranged along the central axis of the length direction of the sealing piece 10, so as to ensure the smooth pulling of the pull rope 11 to the sealing piece 10. When the pressure plate 4 drives the pull rope 11 to move downward, the pull rope 11 will slide along the top surface of the barrel 2, thereby exerting a pulling force on the sealing piece 10 to make it slide out of the sliding groove 9. Since the two ends of the pull rope 11 are not in the same plane, the movement trajectory of the sealing piece 10 sliding out of the sliding groove 9 is arc-shaped. The elastic deformation performance of the sealing piece 10 itself is used to ensure that it can slide out stably. Preferably, in order to ensure the cleanliness of the material in the barrel 2, a top cover is installed on the top surface of the barrel 2. A through hole is provided on the top cover for the pull rope 11 to pass out, which ensures the cleanliness of the overall structure and the stability of the structure.

[0022] As Figure 3 and Figure 4 shown, the sealing piece 10 is bonded with a plurality of fixed ropes 12 on the side away from the pull rope 11, the fixed rope 12 has elastic deformation performance, and the other end of the fixed rope 12 is bonded to the outer peripheral wall of the barrel 2. The fixed rope 12 can exert a pulling force on the sealing piece 10 so that it does not completely slide out of the sliding groove 9. When the sealing piece 10 slides out, the fixed rope 12 is stretched and deformed. Therefore, when the material flow on the pressure plate 4 is exhausted, the pulling force on the fixed rope 12 disappears, so that it is reset under the action of its own elastic deformation performance, thereby exerting a pulling force on the sealing piece 10 to make it return to the initial position again, ensuring the stable use of the structure.

[0023] Working principle: in the initial state, the pressure plate 4 is located at the top of the collecting box 3, when the cross-sectional area of the discharge port of the barrel 2 becomes smaller, the continuously entering material will cause it to pile up higher and higher in the barrel 2 until it enters the collecting box 3, at this time the pressure plate 4 is gradually driven downward by the material and exerts pressure on the elastic member 7 to make it deform, with the continuous downward movement of the pressure plate 4, the communication area between the collecting box 3 and the additional pipe 6 gradually increases, and the material will enter the extrusion pipe through the additional pipe 6, at the same time, the downward movement of the pressure plate 4 will pull the pull rope 11 to slide upward, and the pull rope 11 will drive the blocking piece 10 to slide out of the sliding groove 9, ensuring the stable outflow of the material, when the material in the collecting box 3 flows out, the fixed rope 12 will reset under the action of its own elastic force and pull the blocking piece 10 back to the initial position.

[0024] The preferred embodiments of the present application are described above, the protection scope of the present application is not limited to the above-mentioned embodiments, any technical solutions falling within the concept of the present application shall fall within the protection scope of the present application. It should be noted that, for ordinary skilled in the art, some improvements and decorations without departing from the principles of the present application shall also be considered as falling within the protection scope of the present application.

Claims

1. An injection molding machine extrusion mechanism comprising an extrusion bar (1) and a barrel (2) fixedly connected to the top surface of the extrusion bar (1), the barrel (2) being in communication with the interior of the extrusion bar (1), characterized in that: The inner wall of the barrel (2) is fixedly connected with a collecting box (3), the top surface of the collecting box (3) is higher than the midpoint of the height direction of the barrel (2), a pressure plate (4) is slidably connected in the collecting box (3), a flow outlet (5) is formed in the outer peripheral wall of the barrel (2) and communicates with the collecting box (3), an additional pipe (6) is fixedly connected to the outer peripheral wall of the flow outlet (5), the bottom surface of the additional pipe (6) communicates with the inside of the extrusion rod (1), and the barrel (2) communicates with the additional pipe (6) after the top surface of the pressure plate (4) is filled with plastic particles.

2. An extrusion mechanism for an injection molding machine as defined in claim 1, wherein: A plurality of elastic members (7) are fixedly connected to the inner bottom surface of the collecting box (3), and the other ends of the elastic members (7) are fixedly connected to the bottom surface of the pressure plate (4), and the supporting force of the elastic members (7) on the pressure plate (4) is greater than the gravity of the pressure plate (4).

3. An extrusion mechanism for an injection molding machine as defined in claim 1, wherein: An inlet pipe (8) is arranged above the barrel (2), the inlet pipe (8) and the collecting box (3) are arranged on both sides of the center line of the barrel (2), and part of the inlet pipe (8) extends into the barrel (2).

4. An extrusion mechanism for an injection molding machine as defined in claim 1, wherein: A sliding groove (9) is formed in one end of the additional pipe (6) close to the extrusion rod (1), a sealing piece (10) with elastic deformation performance is slidably connected in the sliding groove (9), and the top surface of the sealing piece (10) is fixedly connected to the top surface of the pressure plate (4) through a plurality of pull ropes (11).

5. An extrusion mechanism for an injection molding machine as defined in claim 4, wherein: One end of the pull rope (11) is fixedly connected to one side of the pressure plate (4) close to the inner wall of the barrel (2), and a plurality of pull ropes (11) are symmetrically arranged along the central axis of the length direction of the sealing piece (10).

6. An extrusion mechanism for an injection molding machine as defined in claim 5, wherein: A plurality of fixed ropes (12) are fixedly connected to one side of the sealing piece (10) away from the pull rope (11), the fixed rope (12) has elastic deformation performance, and the other end of the fixed rope (12) is fixedly connected to the outer peripheral wall of the barrel (2).

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