Discharging supporting device and extrusion mechanism

Abstract

The utility model belongs to the technical field of extrusion mechanisms. The discharging supporting device is characterized by comprising a supporting frame used for being connected with an extrusion mechanism; first mounting holes which are meshed with each other are formed in the support frame; the supporting sleeves are coaxially arranged in the corresponding first mounting holes through connecting ribs; a material channel is formed between the corresponding supporting sleeve and the first mounting hole; and the wear-resistant sleeve is arranged in the supporting sleeve and is used for supporting the screw rotor assembly. The extrusion mechanism is used for solving the technical problems that the outer surface of a screw head and the inner surface of a sleeve are seriously abraded and abnormal sound is generated in the using process due to the fact that a cantilever at the screw discharging end of an existing extrusion mechanism is not provided with a supporting structure. The extruding mechanism comprises the discharging supporting device.

Description

Technical Field

[0001] This utility model belongs to the field of extrusion mechanism technology, specifically relating to a discharge support device and an extrusion mechanism including the above-mentioned discharge support device. Background Technology

[0002] The length-to-diameter ratio of the extrusion mechanism of the twin-screw extruder used in the feed and pet industries is generally above 20:1. Since the material needs to be conveyed, sheared and extruded by the sleeve and screw in the extrusion mechanism to finally form the material, the discharge end of the extrusion mechanism must have a certain flow area to facilitate the passage of the material.

[0003] Traditional extrusion screw rotor assemblies employ a fixed support at the feed end and a cantilevered, unsupported structure at the discharge end. A certain gap is maintained between the screw rotor assembly and the sleeve to minimize relative contact between the screw heads and between the screw head and the sleeve when both screw rotor assemblies rotate clockwise in the same direction. However, this gap should not be too large to prevent material backflow from hindering the extrusion process. Therefore, in practical applications, a small gap results in a large length-to-diameter ratio structure. This causes the discharge end of the screw rotor assembly to sag due to its own weight and come into contact with the sleeve. When the screw rotor assembly rotates, this hard contact and friction with the sleeve generates abnormal noise, leading to severe wear on the outer surface of the screw head and the inner surface of the sleeve, thus shortening its service life.

[0004] In recent years, several papers and patents have been published regarding discharge supports for twin-screw extruders. For example, Chinese utility model patent CN220604867U provides a support structure located in the middle of the screw rotor assembly. However, this middle support cannot guarantee that the discharge end will not sag, and friction still exists even with small gaps. Secondly, the middle location of the support increases the workload of replacing screw configurations, and when abnormal situations such as blockage occur, troubleshooting and equipment disassembly / reassembly become complex and labor-intensive. Chinese utility model patent CN220517503U, published by Xiao Kai et al. in 2023, provides a support located at the discharge end, but its support is embedded in a sleeve, which also suffers from the aforementioned problems. Furthermore, the sleeve-embedded discharge end support is difficult to disassemble and reassemble, and blockages are difficult to clear. Utility Model Content

[0005] The first objective of this invention is to provide a discharge support device to solve the technical problem that the screw discharge end cantilever of the existing extrusion mechanism has no support structure, which leads to severe wear and abnormal noise on the outer surface of the screw head and the inner surface of the sleeve during use.

[0006] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a discharge support device, characterized in that it includes:

[0007] A support frame is used to connect the extrusion mechanism; the support frame is provided with a first mounting hole for interlocking.

[0008] Supporting sleeve, coaxially arranged in the corresponding first mounting hole via connecting rib; the material channel is formed between the corresponding supporting sleeve and the first mounting hole;

[0009] Wear-resistant sleeve, arranged in the supporting sleeve, for supporting the screw rotor assembly.

[0010] The utility model discloses a discharging support device, which is designed as a cantilever type and is used for an extrusion mechanism, for example, a screw extruder. The utility model utilizes the supporting frame to mount the discharging support device on the extrusion mechanism, utilizes the wear-resistant sleeve to support the screw rotor assembly, avoids friction and scratching between the screw head and the screw head and between the screw head and the sleeve, prolongs the service life of the key parts, and reduces the equipment failure rate and maintenance cost of the feed mill.

[0011] The utility model discloses a material channel formed between the supporting sleeve and the first mounting hole is utilized to discharge, guarantees the discharging efficiency.

[0012] The utility model discloses a discharging end support device independent of the extrusion mechanism, which is convenient to disassemble and replace.

[0013] To solve the technical problem of how the supporting frame is connected to the extrusion mechanism, the utility model adopts the following technical scheme: a fixing lug is arranged on the supporting frame and is used for connecting the extrusion mechanism, so that the discharging support device and the extrusion mechanism can be quickly mounted and dismounted.

[0014] To solve the technical problem of how the material channel is realized, the utility model adopts the following technical scheme: four connecting ribs are uniformly arranged on the supporting sleeve; two supporting sleeves are connected via corresponding transverse connecting ribs, so that the flow area of the material is ensured.

[0015] To solve the technical problem of how to expand the material channel, the utility model adopts the following technical scheme: three connecting ribs are uniformly arranged on the supporting sleeve; two supporting sleeves are connected via corresponding transverse connecting ribs. By adopting the above structure, the following advantages are achieved: first, the large-arc discharging channel is convenient to clean; in the embodiment, the flow area of the material is obviously increased under the condition that other parameters are unchanged; second, the number of connecting ribs is simplified; and third, the large-arc discharging channel is convenient to clean residual material.

[0016] To solve the technical problem of how the wear-resistant sleeve is fixed to the supporting sleeve, the utility model adopts the following technical scheme: a positioning stopper is arranged on the supporting sleeve and the wear-resistant sleeve in a matched mode, and a positioning pin is arranged on the positioning stopper. The wear-resistant sleeve is fixed to the supporting sleeve through the positioning stopper and the positioning pin of the supporting sleeve.

[0017] To solve the technical problem of how the wear-resistant sleeve is realized, the utility model adopts the following technical scheme: the material of the wear-resistant sleeve is wear-resistant alloy, wear-resistant ceramic or wear-resistant ceramic composite material.

[0018] The second object of the utility model is to provide a kind of extrusion mechanism, including extrusion subassembly, venturi subassembly, the venturi subassembly is rotatably connected on the extrusion subassembly, the extrusion subassembly includes extrusion cavity and screw rotor subassembly arranged in the extrusion cavity, characterized by, the extrusion subassembly with the venturi subassembly between the discharge support device of any one described above is set;

[0019] The discharge end of the screw rotor subassembly is arranged in the wear-resistant sleeve of the discharge support device;

[0020] The discharge end of the screw rotor subassembly is provided with a compression sleeve for fixing and locking the discharge support device and the screw rotor subassembly.

[0021] To solve the technical problem of inconvenient installation of the discharge support device on the extrusion subassembly, the utility model adopts the following technical scheme, the extrusion subassembly is provided with a discharge short cavity, and a second mounting hole engaged with each other is arranged on the discharge short cavity;The second mounting hole cooperates with the first mounting hole;The inner diameter of the first mounting hole is the same as that of the second mounting hole.In the discharge end of extrusion subassembly, the installation of discharge short cavity is convenient,

[0022] To solve the technical problem of how to install the discharge support device on the extrusion mechanism, the utility model adopts the following technical scheme, the discharge support device is arranged on the discharge short cavity.The discharge end support device of the utility model is independent of the extrusion mechanism, which is convenient to disassemble and replace.

[0023] To solve the technical problem of how to install the discharge support device on the extrusion mechanism, the utility model adopts the following technical scheme, the discharge support device is arranged on the venturi subassembly.The venturi subassembly and the discharge support subassembly are integrated in an integrated structure mode, which saves space;It can be directly changed on existing equipment, reducing the cost of modification;It is convenient for the equipment with screw rotor push-out device on the market to use, without disassembling the discharge support device. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the structure schematic view of the discharge support device of the utility model embodiment 1;

[0025] Figure 2 It is the structure schematic view of the extrusion mechanism of the utility model embodiment 1;

[0026] Figure 3 It is the material flow and cross-sectional area relationship diagram (not set / set discharge support subassembly) of the utility model;

[0027] Figure 4 It is the structure schematic view of the discharge support device of the utility model embodiment 2;

[0028] Figure 5 is a structural schematic view of the discharging support device of the embodiment 3 of the utility model;

[0029] Figure 6 is a structural schematic view of the extrusion mechanism of the embodiment 3 of the utility model;

[0030] In the drawing,

[0031] 10 extrusion mechanism;

[0032] 100 extrusion assembly; 110 extrusion cavity; 120 screw rotor assembly;

[0033] 200 discharging short cavity; 201 second mounting hole;

[0034] 300 venturi assembly;

[0035] 400 movable hinge;

[0036] 500 compression sleeve;

[0037] 600 discharging support device; 610 support frame; 611 fixed lug; 612 first mounting hole; 620 positioning pin; 630 wear-resistant sleeve; 640 support sleeve; 650 connecting rib; 660 support ring. DETAILED DESCRIPTION

[0038] The utility model will be further described below in combination with the drawings.

[0039] Embodiment 1

[0040] In order to improve the friction and abnormal sound defects of the cantilever structure of the screw rotor assembly of the traditional extrusion mechanism, the embodiment designs a discharging support device, avoids the friction and scratching between the screw head and the screw head and the sleeve, prolongs the service life of the key parts, and reduces the equipment failure rate and maintenance cost of the feed mill.

[0041] As shown in Figure 1 The discharging support device 600 includes a support frame 610, a positioning pin 620, a wear-resistant sleeve 630, a support sleeve 640 and a connecting rib 650. The discharging support device has a quick release function.

[0042] The support frame 610 is provided with four fixed lugs 611, which facilitates quick release. The support frame 610 is provided with a first mounting hole 612, such as an "8" hole, in the middle.

[0043] The first mounting hole 612 is provided with a support sleeve 640 in the middle, and the support sleeve 640 is connected with the support frame 610 through a plurality of connecting ribs 650. The two support sleeves 640 are connected through a horizontal connecting rib.

[0044] The wear-resistant sleeve 630 is assembled in the supporting sleeve 640. The wear-resistant sleeve 630 is fixed with the supporting sleeve 640 through the positioning stop and the positioning pin 630. The wear-resistant sleeve 630 can be made of high-hardness wear-resistant alloy, wear-resistant ceramic or ceramic composite material.

[0045] As shown in Figure 2 The extrusion mechanism 10 comprises an extrusion assembly 100, a Venturi assembly 300 and the above-described discharge supporting device 600.

[0046] The extrusion assembly 100 comprises an extrusion cavity 110, and a screw rotor assembly 120 is installed in the extrusion cavity 110. A discharge short cavity 200 is installed on the discharge end of the extrusion cavity 110. The discharge short cavity 200 is provided with a second mounting hole 201 which is engaged with each other. The second mounting hole 201 is preferably an "8" hole. The second mounting hole 201 cooperates with the first mounting hole 612. Specifically, the second mounting hole 201 has the same inner diameter as the first mounting hole 612.

[0047] The Venturi assembly 300 is rotationally connected to the extrusion assembly 100. Specifically, the Venturi assembly 300 is opened and closed through the movable hinge 400, and is sleeved and positioned through the positioning stop on the discharge supporting device 600, and is fixed through the circumferentially distributed bolts.

[0048] The discharge supporting device is arranged between the discharge short cavity 200 and the Venturi assembly 300. The discharge supporting device 600 is connected to the discharge short cavity 200 through bolts.

[0049] The discharge end of the screw rotor assembly is arranged in the wear-resistant sleeve of the discharge supporting device. The discharge end of the screw rotor assembly is provided with a pressing sleeve for fixedly locking the discharge supporting device and the screw rotor assembly. Specifically, the discharge end of the screw rotor assembly 100 is fixedly locked through the pressing sleeve 500.

[0050] The outer diameter of the first mounting hole 612 is consistent with the outer diameter of the second mounting hole of the discharge short cavity 200, and the outer diameter d of the supporting sleeve is confirmed through calculation.

[0051] As shown in Figure 3 Under the same material flow rate, the material flow is positively correlated with the cross-sectional area. Without the material supporting assembly, the material flow cross-sectional area of the discharge end is S1 (the shaded part), and the material flow cross-sectional area of the discharge supporting device is S2 (the shaded part). In order to achieve smooth material flow, S2≥S1. When the inner diameter D2 of the first mounting hole of the discharge supporting device is equal to the inner diameter D1 of the discharge end without the material supporting assembly, the outer diameter d of the supporting sleeve can be calculated according to the known conditions.

[0052] The discharge end supporting device of the extrusion mechanism is independent, which is convenient to disassemble and replace.

[0053] Example 2

[0054] like Figure 4 As shown, unlike Embodiment 1, the support sleeve 640 has three connecting ribs evenly distributed on it; the two support sleeves 640 are connected by corresponding transverse connecting ribs.

[0055] The above structure offers several advantages: firstly, it features a large arc-shaped discharge channel that facilitates cleaning, and the large rounded corners and large openings of the support frame increase the material flow area. In this embodiment, the material flow area is significantly increased while other parameters remain unchanged; secondly, it simplifies the number of connecting ribs; and thirdly, the large arc-shaped discharge channel facilitates the cleaning of residual material and prevents machine blockage.

[0056] Example 3

[0057] like Figure 5 As shown, in this embodiment, the material discharge support assembly 600 replaces the support frame of embodiment 1 or 2 with a support ring 660, without a fixing lug.

[0058] like Figure 6 As shown, unlike Embodiments 1 or 2, in this embodiment, the extrusion mechanism integrates the discharge support assembly 600 within the venturi assembly 300. Specifically, the two are connected via a small interference fit or bolted connection.

[0059] The cylindrical surface of the clamping sleeve 500 set is provided with a small-angle chamfer to facilitate the positioning of the discharge support assembly 600 set. The installation position is the same as in Example 1.

[0060] In this embodiment, the discharge support component 600 is integrated with the venturi component 003 and is opened and closed by the movable hinge 400. Its advantage is that the discharge support component 630 is easy to disassemble and maintain, and it is convenient to clean the material adhering in the discharge short cavity 200.

[0061] This embodiment adopts an integrated structure of Venturi components and discharge support components, which saves space.

[0062] In this embodiment, the Venturi and the discharge support component are integrated into a single structure, which can be directly modified on existing equipment, reducing the cost of modification.

[0063] In this embodiment, the venturi and the discharge support assembly are integrated into a single structure, which facilitates the use of equipment equipped with screw rotor ejection devices on the market without the need to disassemble the discharge support device.

[0064] Working principle: the discharge support device mainly provides support for the cantilever structure of the existing double screw extruder rotor assembly, especially suitable for the working condition of large length-diameter ratio of the extruder. The embodiment mainly proposes a solution for the installation position and use convenience of the discharge device. Especially in the feed industry, on the one hand, the feed factory usually adjusts the screw configuration when processing different feed formulas according to market demand, on the other hand, the screw element is in contact with the material for a long time and is worn out and needs to be replaced regularly. Therefore, the discharge support device is located at the discharge end to facilitate the disassembly and replacement of the screw element, and at the same time, it is convenient to regularly replace the wear-resistant sleeve after wear.

[0065] The discharge support device provided by the embodiment has the advantages of convenient maintenance, simple structure, easy cleaning, low failure rate of the extrusion mechanism of the equipment, and long service life of the screw element.

[0066] The above embodiments are only for illustrating the technical features and concepts of the utility model, and the purpose is to enable the skilled in the art to understand the content of the utility model and implement it, and cannot limit the protection scope of the utility model. Any equivalent changes or modifications made in accordance with the spirit and essential characteristics of the utility model and the embodiments shall be covered within the protection scope of the utility model.

Claims

1. A discharge support device, characterized in that it comprises: a support frame for connecting an extrusion mechanism; said support frame is provided with first mounting holes that are engaged with each other; a support sleeve coaxially arranged in the corresponding first mounting hole via connecting ribs; a material passage is formed between the corresponding support sleeve and the first mounting hole; a wear-resistant sleeve arranged in the support sleeve for supporting a screw rotor assembly.

2. The outfeed support apparatus of claim 1, wherein, The support frame is provided with a fixing lug for connecting the extrusion mechanism.

3. The outfeed support apparatus of claim 1 or 2, wherein, The support sleeve is evenly provided with four connecting ribs; two support sleeves are connected via corresponding transverse connecting ribs.

4. The outfeed support apparatus of claim 1 or 2, wherein, The support sleeve is evenly provided with three connecting ribs; two support sleeves are connected via corresponding transverse connecting ribs.

5. The outfeed support apparatus of claim 1 wherein, The support sleeve and the wear-resistant sleeve are provided with cooperating positioning stops, and the positioning stops are provided with positioning pins.

6. The outfeed support apparatus of claim 1 wherein, The material of the wear-resistant sleeve is wear-resistant alloy, wear-resistant ceramic or wear-resistant ceramic composite material.

7. A squeezing mechanism comprising a squeezing assembly, a venturi assembly rotatably connected to the squeezing assembly, the squeezing assembly comprising a squeezing chamber and a screw rotor assembly disposed within the squeezing chamber, characterized by, The extrusion assembly and the Venturi assembly are provided with the discharge support device according to any one of claims 1-6; The wear-resistant sleeve of the discharge support device is provided with a discharge end of the screw rotor assembly; The discharge end of the screw rotor assembly is provided with a compression sleeve for fixing and locking the discharge support device and the screw rotor assembly.

8. The extrusion mechanism of claim 7, wherein, The extrusion assembly is provided with a discharge short cavity, and the discharge short cavity is provided with second mounting holes that are engaged with each other; the second mounting holes cooperate with the first mounting holes; the inner diameters of the first mounting holes and the second mounting holes are the same.

9. The extrusion mechanism of claim 8, wherein, The discharge short cavity is provided with the discharge support device.

10. The extrusion mechanism of claim 8, wherein, The Venturi assembly is provided with the discharge support device.

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