Mouth die for co-rotating twin-screw extruder

Abstract

The utility model discloses a mouth mold for a co-rotating twin-screw extruder, which comprises a mold plate body, and the mold plate body is provided with a feeding end and a discharging end which are oppositely arranged; the runner is arranged at the feeding end of the template body, a plurality of shunt holes which are distributed in parallel are formed in the middle of the runner, and the shunt holes are of a cylindrical conical chamfer transition structure and penetrate through the feeding end and the discharging end of the template body; and the sealing part is arranged at the feeding end of the template and is distributed along the peripheral side of the runner. The distribution holes are arranged in a cylindrical conical chamfer transition structure and are the same in size, shape and direction, the purpose of consistent discharging speed can be achieved after the discharging amount meets the requirement, the discharging speed is kept basically consistent with the bracing speed, plastic expansion generated by high temperature and high pressure is effectively released through extrusion from inside to outside, and molten raw materials are extruded out. And residue accumulation at the discharge port is avoided. And meanwhile, the sealing part is arranged on the runner, so that the runner is tightly attached to the extruder.

Description

Technical Field

[0001] The utility model belongs to the technical field of extruder dies, and in particular relates to a die for a co-rotating twin-screw extruder. Background Art

[0002] In the strand granulation process of plastic materials using a twin-screw extruder, after the raw materials are mixed in the extruder and reach the required pressure at the die head, the plastic raw materials are extruded from the diversion holes of the extruder die plate under the action of high pressure, and then pelletized after being cooled and blown dry, thus becoming high-quality usable plastic raw materials.

[0003] The usual die plate has a great influence on the appearance of the finished plastic particles. Generally, there are the following points: 1. The die plate positioning accuracy; 2. The die diverter hole structure; 3. The flow channel sealing structure; 4. The discharge saturation; 5. The flow channel resistance. In addition, the die plate structure will also have a great influence on the smoothness of the discharge. Once the discharge is accumulated, it will affect the product quality, increase material loss, greatly reduce the yield rate, and it is difficult to distinguish and remove.

[0004] However, the existing outlet templates only exist in form and fail to solve the problem of material accumulation at the outlet, resulting in increased impurities in the material and serious material breakage, which in turn leads to operating difficulties for operators, reduced product quality, and reduced equipment operation convenience and output rate. Utility Model Content

[0005] In order to solve the above problems, the utility model aims to propose a die for a co-rotating twin-screw extruder, which can keep the discharge speed of each discharge hole consistent and prevent material accumulation.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A die for a co-rotating twin-screw extruder comprises a die plate body, wherein the die plate body has a feed end and a discharge end arranged opposite to each other;

[0008] The flow channel is arranged at the feed end of the template body, and a plurality of parallel distributed diversion holes are arranged in the middle of the flow channel. The diversion holes are arranged in a cylindrical conical chamfered transition structure and penetrate the feed end and the discharge end of the template body;

[0009] The sealing part is arranged at the feeding end of the template and distributed along the peripheral side of the flow channel.

[0010] The diversion hole is obliquely arranged between the feed end and the discharge end of the template body.

[0011] The diversion hole comprises a distribution port, a pressure-maintaining port and a pressure-releasing port which are connected in sequence; the distribution port is arranged at the feeding end of the template body; and the pressure-releasing port is arranged at the discharging end of the template body.

[0012] The inner diameter of the distribution port in the feeding direction is greater than the inner diameter of the pressure release port in the discharging direction.

[0013] The pressure relief port is generally arranged in an outwardly expanding bell-shaped configuration.

[0014] The discharge end of the template body is provided with an inclined section, and the outlet of the pressure relief port is arranged on the inclined section.

[0015] The sealing part comprises a positioning sealing straight groove, and the positioning sealing straight groove is arranged along the circumference of the flow channel.

[0016] The sealing part also includes a conical sealing groove, which is connected to the positioning sealing straight groove, and the conical sealing groove extends toward the discharge end of the template body.

[0017] A plurality of fastening bolt holes are arranged on the template body, and the fastening bolt holes penetrate through the feed end and the discharge end of the template body.

[0018] A reserved threaded hole is arranged on the template body, and the reserved threaded hole is arranged on the side wall of the template body.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] The utility model is used for a co-rotating twin-screw extruder die, the diverter hole is arranged in a cylindrical conical chamfered transition structure, and the size, shape and direction of each diverter hole are the same, and the purpose of consistent discharge speed can be achieved after the discharge amount reaches the requirement, and the discharge rate is kept basically consistent with the drawing speed, and the plastic expansion caused by high temperature and high pressure is effectively released from the inside to the outside, and the molten raw material is extruded to avoid residual accumulation at the discharge port. At the same time, the sealing part arranged on the flow channel realizes the close fit between the flow channel and the extruder.

[0021] The diversion hole is arranged in a cylindrical conical chamfered transition structure and is obliquely arranged between the feed end and the discharge end of the template body to reduce the plane and avoid material accumulation.

[0022] A positioning sealing straight groove and a conical sealing groove are provided to achieve precise matching and positioning of the flow channel and the extruder while performing sealing.

[0023] The diversion hole includes a distribution port, a pressure-maintaining port and a pressure-releasing port which are connected in sequence; after the material reaches a certain pressure, it is extruded outward in sequence, and after reaching a certain pressure, the discharge amount can be kept basically consistent.

[0024] The pressure relief port is designed as an outward-expanding bell-shaped port, which can effectively release high-pressure expansion, avoid material accumulation caused by the curling vortex effect, and make the material extrusion and pulling strip smoother.

[0025] The fastening bolt holes are provided for connection with the extruder head. Bolts adapted to the fastening bolt holes are used to facilitate disassembly and assembly of the template body and the extruder head, thereby facilitating subsequent cleaning and maintenance of the die plate body D102 and the co-rotating twin-screw extruder head flow channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the specific embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 This is a schematic structural diagram of a die for a co-rotating twin-screw extruder in the utility model;

[0028] Figure 2 for Figure 1 A front view of

[0029] Figure 3 for Figure 1 Side perspective view of

[0030] Figure 4 for Figure 1 Rear view of

[0031] Figure 5 for Figure 4 Sectional view at AA in the middle;

[0032] Figure markings: 1-template body, 11-feed end, 12-discharge end, 121-inclined section, 2-flow channel, 3-diverter hole, 31-distribution port, 32-pressure maintaining port, 33-pressure release port, 4-positioning sealing straight groove, 5-conical sealing groove, 6-fastening bolt hole, 7-reserved threaded hole. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to the common technical knowledge and customary means in the field are included in the scope of the present invention.

[0034] Reference Figures 1 to 5 A die for a co-rotating twin-screw extruder comprises a die body 1. In one embodiment of the utility model, the die body 1 is in a rectangular parallelepiped configuration as a whole.

[0035] The template body 1 has a feed end 11 and a discharge end 12 which are arranged opposite to each other; an inclined section 121 is arranged at the discharge end 12 of the template body 1 .

[0036] A plurality of fastening bolt holes 6 are provided on the template body 1, and the fastening bolt holes 6 penetrate the feed end 11 and the discharge end 12 of the template body 1. The fastening bolt holes 6 are provided for connection with the extruder head, and bolts adapted to the fastening bolt holes 6 are used to facilitate the disassembly and assembly of the template body 1 and the extruder head, thereby facilitating the subsequent cleaning and maintenance of the die plate body 1D102 and the co-rotating twin-screw extruder head flow channel 2.

[0037] A reserved threaded hole 7 is provided on the template body 1 , and the reserved threaded hole 7 is provided on the side wall of the template body 1 .

[0038] The flow channel 2 is arranged at the feed end 11 of the template body 1. The size of the flow channel 2 can be specifically set according to the size of the extruder outlet, and the flow channel 2 is precisely matched and positioned for easy disassembly.

[0039] A plurality of parallel distributed diverter holes 3 are arranged in the middle of the flow channel 2. The diverter holes 3 have the same shape, size and direction, and are arranged in parallel with the corresponding discharge port of the co-rotating twin-screw extruder. On the basis of the quantitative output, the normal discharge is satisfied, and the active discharge meets the requirements of uniform size. The number of arranged and distributed diverter holes 3 is determined by the output demand of the co-rotating twin-screw extruder, and can be more or less, and can be flexibly distributed.

[0040] The diverter hole 3 is provided with a cylindrical conical chamfered transition structure to reduce the resistance of the diverter hole 3 and avoid material accumulation; the diverter hole 3 runs through the feed end 11 and the discharge end 12 of the template body 1 .

[0041] The diverter hole 3 is obliquely arranged between the feed end 11 and the discharge end 12 of the template body 1, that is, the axis of the diverter hole 3 is arranged at an angle to the vertical line of the feed end 11 and the discharge end 12 of the template body 1. With this arrangement, the diverter hole 3 can achieve the purpose of consistent discharge speed after the discharge amount reaches the requirement, keep the discharge rate basically consistent with the drawing speed, and extrude from the inside to the outside to effectively release the plastic expansion caused by high temperature and high pressure, extrude the molten raw materials, and avoid residual accumulation at the discharge port.

[0042] The flow dividing hole 3 includes a distribution port 31, a pressure maintaining port 32 and a pressure releasing port 33 which are connected in sequence; the distribution port 31 is arranged at the feeding end 11 of the template body 1; the pressure releasing port 33 is arranged at the discharging end 12 of the template body 1, and the outlet of the pressure releasing port 33 is arranged on the inclined section 121. After the material reaches a certain pressure, it is extruded outward in sequence, and the discharge amount can be kept basically consistent after reaching a certain pressure.

[0043] The inner diameter of the distribution opening 31 in the feeding direction is greater than the inner diameter of the pressure release opening 33 in the discharging direction.

[0044] The pressure relief port 33 is generally in the form of an outward-expanding trumpet-shaped configuration, which is small inside and large outside, and can fully release its stress, effectively release high-pressure expansion, avoid material accumulation caused by the curling vortex effect, and make the material extrusion and pulling strip smoother.

[0045] The sealing part is arranged at the feed end 11 of the template and is distributed along the 2 peripheral sides of the flow channel.

[0046] The sealing part includes a positioning sealing straight groove 4, which is arranged along the side of the flow channel 2; that is, the positioning sealing straight groove 4 is arranged at the feed end 11 of the template body 1. The positioning sealing straight groove 4 is arranged to cooperate with the fastening bolt hole 6 to install the template body 1 on the extruder head, and the sealing effect is achieved while positioning.

[0047] The sealing part further includes a conical sealing groove 5, which is connected to the positioning sealing straight groove 4 and extends toward the discharge end 12 of the template body 1. The conical sealing groove 5 is provided for secondary sealing to prevent leakage.

[0048] The above is a detailed introduction to a co-rotating twin-screw extruder die provided by the utility model. The structure and working principle of the utility model are described in detail in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A die for a co-rotating twin-screw extruder, characterized in that: The template body (1) comprises a template body (1), wherein the template body (1) has a feed end (11) and a discharge end (12) arranged opposite to each other; A flow channel (2) is arranged at the feed end (11) of the template body (1), and a plurality of flow diversion holes (3) are arranged in parallel in the middle of the flow channel (2). The flow diversion holes (3) are arranged in a cylindrical conical chamfered transition structure and penetrate the feed end (11) and the discharge end (12) of the template body (1); The sealing part is arranged at the feed end (11) of the template and is distributed along the circumference of the flow channel (2).

2. A die for a co-rotating twin-screw extruder according to claim 1, characterized in that: The diverter hole (3) is arranged obliquely between the feed end (11) and the discharge end (12) of the template body (1).

3. A die for a co-rotating twin-screw extruder according to claim 2, characterized in that: The flow distribution hole (3) comprises a distribution port (31), a pressure maintaining port (32) and a pressure release port (33) which are connected in sequence; the distribution port (31) is arranged at the feed end (11) of the template body (1); and the pressure release port (33) is arranged at the discharge end (12) of the template body (1).

4. A die for a co-rotating twin-screw extruder according to claim 3, characterized in that: The inner diameter of the distribution port (31) in the feeding direction is greater than the inner diameter of the pressure release port (33) in the discharging direction.

5. A die for a co-rotating twin-screw extruder according to claim 2 or 3, characterized in that: The pressure relief port (33) is generally arranged in an outwardly expanding bell-shaped configuration.

6. A die for a co-rotating twin-screw extruder according to claim 2 or 3, characterized in that: The discharge end (12) of the template body (1) is provided with an inclined section (121), and the outlet of the pressure relief port (33) is arranged on the inclined section (121).

7. The die for a co-rotating twin-screw extruder according to claim 1, characterized in that: The sealing portion comprises a positioning sealing straight groove (4), and the positioning sealing straight groove (4) is arranged along the circumference of the flow channel (2).

8. A die for a co-rotating twin-screw extruder according to claim 7, characterized in that: The sealing portion further comprises a conical sealing groove (5), the conical sealing groove (5) being connected to the positioning sealing straight groove (4), and the conical sealing groove (5) extending towards the discharge end (12) of the template body (1).

9. The die for a co-rotating twin-screw extruder according to claim 1, characterized in that: A plurality of fastening bolt holes (6) are provided on the template body (1), and the fastening bolt holes (6) penetrate through the feed end (11) and the discharge end (12) of the template body (1).

10. The die for a co-rotating twin-screw extruder according to claim 1, characterized in that: A reserved threaded hole (7) is provided on the template body (1), and the reserved threaded hole (7) is arranged on the side wall of the template body (1).

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