Building block type counter-rotating double-screw lateral forced exhaust feeding machine

Abstract

The utility model relates to the technical field of screw extruders, in particular to a building block type counter-rotating double-screw lateral forced exhaust feeding machine. The building block type counter-rotating double-screw lateral forced exhaust feeding machine comprises a base, a driving motor, a gear box and a feeding box body are sequentially arranged at the upper end of the base in the length direction, two feeding screws are arranged in the feeding box body and matched with the gear box, the driving motor is used for inputting power to the gear box, and the gear box is matched with the two feeding screws. The gearbox is used for driving the two feeding screws to rotate in different directions, a feeding mechanism is arranged on the side, close to the gearbox, of the upper end of the feeding box and used for conveying filler to the feeding box, and a discharging port is formed in the end, away from the gearbox, of the feeding box. The counter-rotating double-screw structure can guide materials to enter the threaded grooves in the two sides at the same time to form a two-way conveying path, the dynamic stacking effect during rotation in the same direction is thoroughly avoided, extrusion force on powder is maintained, efficient exhaust is achieved, and feeding blocking is prevented.

Description

Technical Field

[0001] This utility model relates to the field of screw extruder technology, and more specifically, to a modular, counter-rotating twin-screw, side-forced exhaust feeder. Background Technology

[0002] Twin-screw forced feeders, as continuous solid conveying equipment, are widely used in plastics processing, food manufacturing, and chemical raw material handling. Their core structure consists of two parallel screw shafts, driven by a variable frequency motor to achieve synchronous or asynchronous rotation. This device employs a side-feed design, utilizing the propulsive action of the screw's helical surface to forcibly convey the filler from the feed port into the extruder or mixer barrel.

[0003] Current co-rotating twin-screw feeders have significant technical defects. When viewed from below the feed inlet, the two screws rotate in the same direction, and the precise meshing gap between them obstructs the material transport path. Loose material falling from the feeder cannot effectively pass through the narrow meshing gap into the lower meshing zone; instead, it is pushed by the screw edges of the rotating screws to the upper meshing zone, forming a dynamic accumulation. This unsteady flow state means that the material can only move slowly along the upper meshing zone under the periodic push of the screw edges until it is scraped off by the side wall of the feed inlet, and ultimately can only enter the conveying groove of one screw from one side. This forced single-channel conveying mechanism not only leads to uneven distribution of material residence time but also causes periodic "material shortage-accumulation-clearing" cycles in the feed inlet area, seriously affecting the continuity of feeding and metering accuracy. It is worth noting that if the screw meshing clearance is deliberately increased to improve material permeability, the co-rotation characteristic will cause the screw groove of one of the screws to form a dynamic shielding effect in the feeding area, hindering the timely filling of fresh material. This also leads to problems such as poor venting of powder materials and bridging and agglomeration. Both of these operating conditions significantly reduce the volumetric efficiency of the feeder, resulting in increased unit energy consumption and decreased process stability. Utility Model Content

[0004] This invention provides a modular, counter-rotating twin-screw, side-forced exhaust feeder that overcomes some or all of the defects of the prior art.

[0005] According to the modular counter-rotating twin-screw lateral forced exhaust feeder of this utility model embodiment, it includes a base, characterized in that a drive motor, a gearbox, and a feeding box are sequentially arranged along the length direction at the upper end of the base. Two feeding screws are arranged inside the feeding box, and the two feeding screws cooperate with the gearbox. Each feeding screw includes a mandrel for cooperating with gears in the gearbox. Multiple threaded elements and a mixing rotor are sleeved on the mandrel. An exhaust port is formed above the mixing rotor in the feeding box. The multiple threaded elements and the mixing rotor are splinedly engaged with the mandrel. The drive motor inputs power to the gearbox, which drives the two feeding screws to rotate counter-rotate. A feeding mechanism is provided at the upper end of the feeding box near the gearbox, for conveying filler into the feeding box. An outlet is formed at the end of the feeding box away from the gearbox.

[0006] In a preferred embodiment of this utility model, the feeding mechanism includes a feeding hopper, a feeding screw at the bottom of the feeding hopper, a feeding motor on one side of the feeding screw, and a feeding housing connected to the feeding box at the end of the feeding hopper away from the feeding motor. A feeding port is formed at the feeding box, and the feeding port and the feeding housing are correspondingly matched.

[0007] In a preferred embodiment of this invention, a weighing scale is provided inside the feed hopper.

[0008] In a preferred embodiment of this utility model, the drive motor has an output shaft, the gearbox has an input shaft, a connecting sleeve is provided between the output shaft and the input shaft, the free end of the output shaft forms a first threaded segment, the free end of the input shaft forms a second threaded segment, and both the first threaded segment and the second threaded segment are threadedly engaged with the inner wall of the connecting sleeve.

[0009] In a preferred embodiment of this utility model, a first end cap is fitted at the output shaft, and the first end cap is threadedly engaged with the outer wall of the connecting sleeve; a second end cap is fitted at the input shaft, and the second end cap is threadedly engaged with the outer wall of the connecting sleeve.

[0010] In a preferred embodiment of this utility model, a first washer is sleeved on the output shaft, and the first washer abuts against the first end cover and the first threaded section respectively; a second washer is sleeved on the input shaft, and the second washer abuts against the second end cover and the second threaded section respectively.

[0011] In a preferred embodiment of this utility model, casters are provided at the four corners of the bottom of the base.

[0012] Beneficial effects:

[0013] The modular counter-rotating twin-screw lateral forced exhaust feeder provided in this embodiment flips outward when the feeding screw reverses, guiding the material to enter the threaded grooves on both sides simultaneously to form a bidirectional conveying path. This completely avoids the dynamic accumulation effect when rotating in the same direction, maintaining the extrusion pressure on the powder to achieve efficient exhaust, and preventing the feeding from being obstructed.

[0014] Furthermore, the threaded element and mandrel are detachably assembled via splines, allowing for customized thread angle / lead combinations. Compared to a one-piece screw, this reduces operating costs and shortens the process adaptation cycle.

[0015] By incorporating a mixing rotor, gas within the powder can be effectively eliminated, thereby improving the quality of the added powder.

[0016] In addition, the feeding screws rotate in opposite directions and flip outwards, so that the material can continuously enter the threaded grooves on both sides of the two feeding screws and move forward continuously as the screws rotate. This structure can improve the feeding efficiency by more than 50% compared with screws that rotate in the same direction. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of the modular counter-rotating twin-screw lateral forced exhaust feeder in at least one embodiment of the present invention;

[0018] Figure 2 This is a top view schematic diagram of the modular, counter-rotating twin-screw, lateral forced exhaust feeder in at least one embodiment of the present invention;

[0019] Figure 3 This is a cross-sectional schematic diagram of the internal structure of the feeding box in at least one embodiment of the present invention;

[0020] Figure 4 for Figure 1 A magnified view of a portion of point A in the middle. Detailed Implementation

[0021] Seen in Figure 1-3 This embodiment provides a modular counter-rotating twin-screw side-forced exhaust feeder, which is used to cooperate with the side wall of a screw extruder to feed filler into the cavity of the screw extruder to improve the performance of the final product. The modular counter-rotating twin-screw side-forced exhaust feeder includes a base 1. The upper end of the base 1 is provided with a drive motor 2, a gearbox 3 and a feeding box 4 in sequence along the length direction. The feeding box 4 is provided with two feeding screws 5. The two feeding screws 5 cooperate with the gearbox 3. The drive motor 2 is used to input power to the gearbox 3, and the gearbox 3 is used to drive the two feeding screws 5 to rotate in opposite directions. The upper end of the feeding box 4 is provided with a feeding mechanism on the side near the gearbox 3. The feeding mechanism is used to convey filler into the feeding box 4. The end of the feeding box 4 away from the gearbox 3 forms a discharge port 43.

[0022] Specifically, see Figure 4The two feeding screws 5 rotate in opposite directions and flip outwards, so that the material can continuously enter the threaded grooves on both sides of the two feeding screws 5 and move forward continuously as the screws rotate. This structure can improve the feeding efficiency by more than 50% compared with screws that rotate in the same direction.

[0023] The feed screw 5 includes a mandrel for engaging with the gearbox 3. The mandrel is fitted with multiple threaded elements 51 and a mixing rotor 52.

[0024] Furthermore, the feed box 4 forms an exhaust port 44 above the internal mixing rotor. The internal mixing rotor 52 can discharge the air in the powdered filler added to the screw extruder from the exhaust port 44, thereby ensuring the extrusion quality of the final product.

[0025] It is understandable that powdered fillers can be materials with good water absorption, thereby effectively improving the water absorption of the final product. Through the above structure, the powdered fillers added into the screw extruder are squeezed out of the air, thereby improving the quality of addition.

[0026] Furthermore, the multiple threaded elements 51 and the mixing rotor are splined with the mandrel. The detachable connection between the threaded elements 51 and the mandrel allows for the selection of different types of threaded elements 51 as needed to adapt to different types of fillers and process parameters, without the need to machine the screw as a whole, thus significantly reducing the cost of use.

[0027] It is understood that the center distance between the two feeding screws 5 is less than the maximum diameter of the feeding screws 5. Therefore, the two screws have a certain meshing gap, which can effectively squeeze the powder filler, which is conducive to expelling the gas in the powder filler and thus improving the feeding efficiency.

[0028] In some embodiments, the feeding mechanism includes a feeding hopper 41, a feeding screw at the bottom of the feeding hopper 41, a feeding motor on one side of the feeding screw, and a feeding housing at the end of the feeding hopper 41 away from the feeding motor that communicates with the feeding box 4. A feeding port 42 is formed at the feeding box 4, and the feeding port 42 is correspondingly matched with the feeding housing. The feeding screw is driven by the feeding motor to feed the material into the feeding port 42.

[0029] The feed hopper 41 is equipped with a weighing scale, which enables quantitative feeding.

[0030] In some embodiments, the drive motor 2 has an output shaft 21, the gearbox 3 has an input shaft 31, a connecting sleeve 6 is provided between the output shaft 21 and the input shaft 31, a first threaded section 211 is formed at the free end of the output shaft 21, and a second threaded section 311 is formed at the free end of the input shaft 31. Both the first threaded section 211 and the second threaded section 311 are threadedly engaged with the inner wall of the connecting sleeve 6, thereby realizing the power transmission between the output shaft 21 and the input shaft 31.

[0031] Specifically, a first end cap 61 is fitted onto the output shaft 21, and the first end cap 61 is threaded into the outer wall of the connecting sleeve 6. A second end cap 62 is fitted onto the input shaft 31, and the second end cap 62 is threaded into the outer wall of the connecting sleeve 6. A first washer 63 is fitted onto the output shaft 21, and the first washer 63 abuts against the first end cap 61 and the first threaded section 211. A second washer 64 is fitted onto the input shaft 31, and the second washer 64 abuts against the second end cap 62 and the second threaded section 311.

[0032] In some embodiments, casters 7 are provided at the four corners of the bottom of the base 1.

[0033] It is readily understood that those skilled in the art can combine, split, or reorganize the embodiments provided in this application to obtain other embodiments, all of which do not exceed the protection scope of this application.

Claims

1. A modular, counter-rotating twin-screw, side-forced exhaust feeder, comprising a base, characterized in that, The upper end of the base is provided with a drive motor, a gearbox, and a feeding box in sequence along the length direction. The feeding box contains two feeding screws, which cooperate with the gearbox. Each feeding screw includes a mandrel for cooperating with the gears in the gearbox. Multiple threaded elements and a mixing rotor are sleeved on the mandrel. An exhaust port is formed above the mixing rotor in the feeding box. The multiple threaded elements and the mixing rotor are splined with the mandrel. The drive motor is used to input power to the gearbox, which drives the two feeding screws to rotate in opposite directions. A feeding mechanism is provided on the upper end of the feeding box near the gearbox for feeding filler into the feeding box. An outlet is formed on the end of the feeding box away from the gearbox.

2. The modular counter-rotating twin-screw lateral forced exhaust feeder according to claim 1, characterized in that, The feeding mechanism includes a feeding hopper, a feeding screw at the bottom of the feeding hopper, a feeding motor on one side of the feeding screw, and a feeding housing connected to the feeding box at the end of the feeding hopper away from the feeding motor. A feeding port is formed at the feeding box, and the feeding port and the feeding housing are correspondingly matched.

3. The modular counter-rotating twin-screw lateral forced exhaust feeder according to claim 2, characterized in that, The feed hopper is equipped with a weighing scale.

4. The modular counter-rotating twin-screw lateral forced exhaust feeder according to claim 1, characterized in that, The drive motor has an output shaft, the gearbox has an input shaft, and a connecting sleeve is provided between the output shaft and the input shaft. The free end of the output shaft forms a first threaded section, and the free end of the input shaft forms a second threaded section. Both the first threaded section and the second threaded section are threaded into the inner wall of the connecting sleeve.

5. The modular counter-rotating twin-screw lateral forced exhaust feeder according to claim 4, characterized in that, A first end cap is fitted at the output shaft, and the first end cap is threadedly engaged with the outer wall of the connecting sleeve. A second end cap is fitted at the input shaft, and the second end cap is threadedly engaged with the outer wall of the connecting sleeve.

6. The modular counter-rotating twin-screw lateral forced exhaust feeder according to claim 5, characterized in that, A first washer is fitted at the output shaft, and the first washer abuts against the first end cover and the first threaded section respectively. A second washer is fitted at the input shaft, and the second washer abuts against the second end cover and the second threaded section respectively.

7. The modular counter-rotating twin-screw lateral forced exhaust feeder according to claim 1, characterized in that, Casters are provided at all four corners of the base.

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