Discharging mechanism of double-screw extruder

Abstract

The utility model discloses a discharging mechanism of a double-screw extruder, which comprises a shell and a mouth mold, the shell is arranged on a machine head, the shell is provided with an inlet and outlet for the mouth mold to enter and exit from an inner cavity of the shell, and a heating device is arranged on one side of the shell. A pair of heat conduction clamping pieces is arranged in an inner cavity of the shell and provided with a sliding groove and a sliding column which are in sliding fit with each other, clamping grooves matched with the mouth mold are formed in the opposite sides of the clamping pieces, and an adjusting assembly for adjusting the two clamping grooves to move towards the mouth mold is arranged. The clamping pieces and the heating device are each provided with a heat preservation inner cavity for storing heat conduction liquid, each heat preservation inner cavity is communicated and connected with a conveying pipe, the portions, close to the clamping pieces and between the pair of clamping pieces, of the conveying pipes have the telescopic function, and circulating water pumps are installed on the conveying pipes. The double-screw extruder can be installed according to the shapes and sizes of different mouth molds, and plastic can be effectively prevented from being solidified at the discharge port.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic processing, in particular to a discharging mechanism of a twin-screw extruder. Background Art

[0002] The screw extruder relies on the pressure and shear force of rotation to fully plasticize and evenly mix the materials, and then form the film. The screw extruder can be divided into twin-screw extruder, single-screw extruder, rare multi-screw extruder and screwless extruder. Among them, the twin-screw extruder is developed on the basis of the single-screw extruder. Because the twin-screw extruder has good feeding performance, mixing and plasticizing performance, exhaust performance, extrusion stability and other characteristics, it has been widely used in the molding processing of extruded products.

[0003] The twin-screw extruder is composed of auxiliary equipment such as the machine body, drive device, transmission device, feeding device, barrel, heating device, screw, discharging mechanism and straightening device. The plastic material enters the extruder from the feeding device. The drive device and transmission device drive the screw to rotate and bring the plastic forward. In the process of forward movement, the plastic is heated by the heating device of the barrel. The shearing and compression brought by the screw melt the material and then discharge it through the die on the discharging mechanism. The function of the machine head is to convert the plastic melt in rotation into parallel linear motion, so that the plastic is further plasticized and uniformly introduced into the die evenly and smoothly, and the necessary molding pressure is also given to make the plastic easy to mold and the resulting product dense. The die has a channel with a certain cross-sectional shape, and the plastic melt obtains the desired shape when flowing in the discharge port of the die.

[0004] The shapes and sizes of the dies in the heads manufactured by various existing manufacturers vary greatly, including round, polygonal and special-shaped dies. Some of these dies are not installed firmly or cannot be installed on the heads of twin-screw extruders manufactured by other manufacturers; in addition, since the die outlet is exposed to the lower temperature of the outside world, the plastic extruded by the die is easy to solidify at the outlet during the production process, and some of the plastic solidifies at the outlet, affecting the extrusion shape of the plastic. In summary, a twin-screw extruder discharge mechanism is proposed to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a twin-screw extruder, which can be installed according to different die shapes and sizes and can effectively prevent plastic from solidifying at the discharge port.

[0006] The above technical purpose of the utility model is achieved through the following technical solutions: a twin-screw extruder discharging mechanism, including a shell and a die, the shell is installed on the machine head, the shell is provided with an inlet and outlet for the die to enter and exit the shell inner cavity, and a heating device is located on one side of the shell, characterized in that: the shell inner cavity is provided with a pair of heat-conducting clamping members and the pair of clamping members are provided with sliding grooves and sliding columns that slide in cooperation with each other, the pair of clamping members are provided with clamping grooves that are adapted to the die on the opposite sides, and an adjustment component for adjusting the two clamping grooves to move toward the die is provided, the clamping members and the heating device are both provided with an insulating inner cavity for storing heat-conducting liquid, each of the insulating inner cavities is connected to a delivery pipe, the delivery pipe located near the clamping member and between the pair of clamping members has a telescopic function, and a circulating water pump is installed on the delivery pipe.

[0007] By adopting the above technical scheme, the adjustment component can be used to adjust the size of the clamping groove, so as to adapt to the clamping of dies of different shapes and sizes. The heat-conducting clamping piece has a heat-conducting function, so that the heat of the heating device is transferred to the inner cavity of the clamping piece by circulating the heat-conducting liquid. The heat is conducted to dies of different shapes and sizes through the clamping piece, effectively preventing the plastic from solidifying at the discharge port.

[0008] It is further configured that: the adjustment assembly includes an adjustment knob threadedly connected to the housing and moving toward the clamping member.

[0009] By adopting the above technical solution, the two clamping members are fixed in the clamping groove toward the die by adjusting the setting of the knob.

[0010] It is further configured as follows: a lock hole is provided on the adjusting knob, and a plurality of positioning holes are provided on the housing along the circumference of the tightening spring, and anti-loosening screws are inserted into the lock hole and the corresponding positioning holes in sequence.

[0011] By adopting the above technical solution, dies of different shapes and sizes are installed in the clamping groove so that the fixing force of the adjusting knob is different. The anti-loosening screw is inserted into the corresponding positioning hole to prevent the adjusting knob from loosening due to mechanical vibration.

[0012] It is further configured that: a spring is arranged between the pair of clamping members.

[0013] By adopting the above technical solution and setting the spring, it is easy to open the clamping piece when taking out the mouth mold, which effectively prevents the anti-slip pattern from scratching the mouth mold.

[0014] It is further configured that: anti-slip lines are provided in the clamping groove.

[0015] By adopting the above technical solution and setting the anti-slip texture, loosening of the clamping groove and the die can be prevented.

[0016] It is further configured that: a sealing member is also provided between the clamping member and the inlet and outlet, and between the shell and the machine head.

[0017] By adopting the above technical solution, the heat loss in the inner cavity of the shell is reduced by setting the sealing member. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an overall cross-sectional view of the embodiment;

[0019] Figure 2 It is an exploded schematic diagram of an embodiment;

[0020] Figure 3 This is an enlarged schematic diagram of Example A;

[0021] Figure 4 This is an enlarged schematic diagram of Example B;

[0022] Figure 5 This is an enlarged schematic diagram of Example C;

[0023] In the figure: 1. Shell; 11. Mouth die; 12. Inlet and outlet; 13. Heating device; 14. Clamping piece; 15. Clamping groove; 16. Machine head; 17. Insulating cavity; 18. Delivery pipe; 19. Circulating water pump; 26. Sliding groove; 27. Sliding column; 20. Adjusting knob; 21. Locking hole; 22. Positioning hole; 23. Anti-loosening screw; 24. Spring; 25. Sealing piece. DETAILED DESCRIPTION

[0024] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0025] refer to Figures 1 to 5 A twin-screw extruder discharging mechanism comprises a shell 1 and a die 11, the shell 1 is bolted on a head 16, the shell 1 is provided with an inlet and outlet 12 for the die 11 to enter and exit the inner cavity of the shell 1, and a heating device 13 is located on one side of the shell 1, characterized in that: a pair of heat-conducting clamping members 14 are provided in the inner cavity of the shell 1, and the pair of clamping members 14 are provided with sliding grooves 26 and sliding columns 27 that slide in cooperation with each other, a clamping groove 15 adapted to the die 11 is provided on the opposite side of the pair of clamping members 14, and an adjusting component for adjusting the movement of the two clamping grooves 15 toward the die 11 is provided, the clamping member 14 and the heating device 13 are both provided with an insulation inner cavity 17 for storing heat-conducting liquid, each insulation inner cavity 17 is connected to a delivery pipe 18, the delivery pipe 18 located near the clamping member 14 and between the pair of clamping members 14 has a telescopic function, and a circulating water pump 19 is installed on the delivery pipe 18.

[0026] The adjustment assembly includes an adjustment knob 20 threadedly connected to the shell 1 and moving toward the clamping member 14. A lock hole 21 is provided on the adjustment knob 20. A plurality of positioning holes 22 are provided on the shell 1 along the circumference of the clamping spring 24. An anti-loosening screw 23 is inserted into the lock hole 21 and the corresponding positioning holes 22 in sequence. A spring 24 is provided between a pair of clamping members 14. Anti-slip grooves are provided in the clamping groove 15. A sealing member 25 is also provided between the clamping member 14 and the edge of the inlet and outlet 12, and between the shell 1 and the machine head 16.

[0027] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A twin-screw extruder discharging mechanism, comprising a housing (1) and a die (11), wherein the housing (1) is mounted on a die head (16), the housing (1) is provided with an inlet and outlet (12) for the die (11) to enter and exit the inner cavity of the housing (1), and a heating device (13) is located on one side of the housing (1), characterized in that: The inner cavity of the shell (1) is provided with a pair of heat-conducting clamping members (14), and the pair of clamping members (14) are provided with sliding grooves (26) and sliding columns (27) that slide in cooperation with each other. The opposite sides of the pair of clamping members (14) are provided with clamping grooves (15) that are compatible with the die (11), and an adjustment component is provided for adjusting the two clamping grooves (15) to move toward the die (11). The clamping members (14) and the heating device (13) are both provided with an insulating inner cavity (17) for storing heat-conducting liquid. Each of the insulating inner cavities (17) is connected to a delivery pipe (18). The delivery pipe (18) located near the clamping member and between the pair of clamping members (14) has a telescopic function, and a circulating water pump (19) is installed on the delivery pipe (18).

2. The twin-screw extruder discharging mechanism according to claim 1, characterized in that: The adjustment assembly comprises an adjustment knob (20) threadedly connected to the housing (1) and moving toward the clamping member (14).

3. The twin-screw extruder discharging mechanism according to claim 2, characterized in that: The adjusting knob (20) is provided with a locking hole (21), and a plurality of positioning holes (22) are provided on the housing (1) along the circumference of the tightening spring, and anti-loosening screws (23) are sequentially inserted into the locking hole (21) and the corresponding positioning holes (22).

4. The twin-screw extruder discharging mechanism according to claim 1, characterized in that: A spring (24) is arranged between the pair of clamping members (14).

5. The twin-screw extruder discharging mechanism according to claim 1, characterized in that: Anti-slip patterns are arranged in the clamping groove (15).

6. The twin-screw extruder discharging mechanism according to claim 1, characterized in that: A sealing member (25) is also provided between the clamping member (14) and the inlet and outlet (12), and between the housing (1) and the machine head (16).

Images