Double-screw tearing and grinding machine

Abstract

The invention discloses a double-screw tearing and grinding machine. The double-screw tearing and grinding machine consists of a transmission and control mechanism, screws and a charging barrel, the device is characterized in that the charging barrel is formed by connecting an infinity-shaped front charging barrel and a non-communicated infinity-shaped rear charging barrel in a split mode through bolts, a split type front lining with a linear groove in the inner surface is embedded in the front charging barrel, and a split type rear lining with a pineapple-shaped protruding block on the inner surface is embedded in the rear charging barrel. The screw is composed of two parallel mandrels rotating in the same direction, and a material conveying thread element, a gear-shaped trapezoidal thread element, a dispersing thread element and a brooming thread element which are sequentially arranged on the mandrels in a sleeving mode. The screw rods penetrating through the front charging barrel form a meshed double-screw-rod tearing and grinding system, and the screw rods penetrating through the rear charging barrel form two single-screw-rod rubbing and grinding systems. Radial strip-shaped grooves are formed in two inclined planes of a screw flight of the gear-shaped trapezoidal thread element, and an axial groove is formed in the top surface of the gear-shaped trapezoidal thread element. The double-screw tearing and grinding machine has the advantages of less short fiber cutting, good cutting uniformity, prevention of fiber entanglement and remarkable improvement of fibrillation effect, and can be used for producing pulp with high length-diameter ratio and high fibrillation rate.

Description

Technical Field

[0001] The present invention relates to the technical field of pulp production equipment, and particularly relates to a twin-screw shredder mill. Background Art

[0002] Fiber fibrillation refers to the phenomena of hair raising, tearing, fibrillating, and fibrillation of the fiber cell wall that occur after the pulp is beaten during the pulp and paper production process. This process is achieved through mechanical action and aims to improve the quality and performance of the paper. Specifically, fiber fibrillation can increase the softness, liquid absorption, and printing adaptability of the paper, and also helps to improve the strength and uniformity of the paper. Currently, plant fibers are mainly fibrillated by crushers, but the current crushers have poor fibrillation effects, and the fiber entanglement is relatively serious after processing. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a twin-screw shredder mill, which can improve the fibrillation effect of fibers and reduce fiber entanglement.

[0004] A twin-screw shredder mill according to an embodiment of the first aspect of the present invention is composed of a transmission and control mechanism, screws, and a barrel. The barrel is composed of a split ∞-shaped front barrel and a non-connected ∞-shaped rear barrel connected by bolts. The front barrel is internally embedded with a split front bushing with linear grooves on the inner surface, and the rear barrel is internally embedded with a split rear bushing with pineapple-shaped protrusions on the inner surface. The screw is composed of two parallel and co-rotating core shafts and a feeding thread element, a gear-shaped trapezoidal thread element, a dispersing thread element, and a fibrillation thread element sequentially sleeved on the core shafts. The gear-shaped trapezoidal thread element includes a plurality of forward thread elements and a plurality of reverse thread elements. The thread direction of the forward thread element is the same as that of the feeding thread element, and the reverse thread element has a thread direction opposite to that of the feeding thread element. The two screws passing through the front barrel form an engaging twin-screw shredding system, and the two screws passing through the rear barrel form two single-screw rubbing systems. At least one first groove is provided on two inclined surfaces of the thread edge of the gear-shaped trapezoidal thread element.

[0005] A twin-screw shredder mill according to an embodiment of the present invention has at least the following beneficial effects: When the material enters the barrel, the feeding thread element of the screw drives the material to be conveyed forward. Then, the material enters between the gear-shaped trapezoidal thread elements of the two screws and is rubbed, squeezed, and sheared by the multiple thread edges of the forward thread element and the reverse thread element, realizing the fibrillation of the material. At the same time, the first groove on the thread edge is used to avoid fiber entanglement and improve the fibrillation effect.

[0006] According to some embodiments of the present invention, the first grooves are provided on both of the two inclined surfaces of the screw rib, and the number of the first grooves on the two inclined surfaces is equal.

[0007] According to some other embodiments of the present invention, the first grooves are provided on both of the two inclined surfaces of the screw rib, the number of the first grooves on the two inclined surfaces is unequal, and the first grooves on the two inclined surfaces are staggered along the circumferential direction of the screw.

[0008] According to some embodiments of the present invention, at least one second groove is formed on the upper end surface of the screw rib.

[0009] According to some embodiments of the present invention, a front bushing is embedded inside the front barrel, and a plurality of third grooves are formed on the inner wall of the front bushing.

[0010] According to some embodiments of the present invention, the included angle formed by the intersection of the third groove and the axis of the screw is less than or equal to 90 degrees.

[0011] According to some embodiments of the present invention, a rear bushing is embedded inside the rear barrel, and a plurality of bumps arranged in a pineapple shape are provided on the inner wall of the rear bushing.

[0012] According to some embodiments of the present invention, the front barrel and the rear barrel are of a split structure, and the front barrel and the rear barrel are fixed into one body by fasteners. According to some embodiments of the present invention, the width of the first groove is greater than or equal to 3 mm and less than or equal to 8 mm.

[0013] According to some embodiments of the present invention, the depth of the first groove is greater than or equal to 2 mm and less than or equal to 5 mm.

[0014] Some additional aspects and advantages of the present invention will be given in the following description, some will become obvious from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein: Figure 1 is a schematic diagram of a twin-screw shredder according to an embodiment of the present invention; Figure 2 is a cross-sectional view of a working mechanism according to an embodiment of the present invention; Figure 3 is Figure 1 the A-A cross-sectional view in Figure 4 is Figure 1 the B-B cross-sectional view in Figure 5 This is a schematic structural diagram of the forward-thread element in the embodiment of the present invention; Figure 6 This is a right view of the forward-thread element in the embodiment of the present invention.

[0016] Explanation of reference numerals: Motor 110, gearbox 120; Working mechanism 200, hopper 210, mandrel 220, feeding screw element 221, reverse screw element 222, forward screw element 223, screw edge 224, first groove 225, second groove 226, barrel 230, front barrel 231, rear barrel 232, front bushing 233, rear bushing 234. Detailed implementation manners

[0017] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0018] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, rear, left, right, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0019] In the description of the present invention, the meaning of "several" is one or more, the meaning of "multiple" is two or more, and understandings such as "greater than", "less than", "exceeding", etc. do not include the recited number, and understandings such as "above", "below", "within", etc. include the recited number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0020] In the description of the present invention, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0021] Refer to Figures 1 to 4, an embodiment of the present invention provides a twin-screw shredding mill, which includes a transmission and control mechanism and a working mechanism 200. The working mechanism 200 includes a barrel 230 and two screws. The two screws are arranged inside the barrel 230 and can rotate. The transmission and control mechanism drives the two screws to rotate in the same direction. The screw includes a core shaft 220 and a feeding thread element 221, a gear-shaped trapezoidal thread element, a dispersing thread element, and a brooming thread element that are sequentially sleeved on the core shaft. The gear-shaped trapezoidal thread element includes a forward thread element 223 and a reverse thread element 222. The thread direction of the forward thread element 223 is the same as that of the feeding thread element 221, and the reverse thread element 222 is opposite to the thread direction of the feeding thread element 221. The forward thread element 223 and the reverse thread element 222 can be provided singly or in multiple numbers, and multiple forward thread elements 223 and multiple reverse thread elements 222 are staggered on the core shaft 220; wherein, the threads of the forward thread element 223 and the reverse thread element 222 are each formed with a plurality of thread ridges 224, and at least one first groove 225 is provided on the inclined surface of the thread ridge 224. It can be understood that the width of the first groove 225 can be set to be greater than or equal to 3 mm and less than or equal to 8 mm, and the depth of the first groove 225 can be set to be greater than or equal to 2 mm and less than or equal to 5 mm. The barrel 230 is connected with a hopper 210, and the hopper 210 communicates with the feeding port of the barrel 230. The barrel 230 is formed by connecting a split ∞-shaped front barrel 231 and a non-connected ∞-shaped rear barrel 232 through bolts. The two screws are meshed in the front barrel to form a meshing twin-screw shredding system, and the two screws form two single-screw rubbing systems in the rear barrel.

[0022] When the twin-screw shredding mill operates, the material enters the barrel 230 through the hopper 210. The transmission and control mechanism drives the screws to rotate. By the meshing and rotation of the feeding thread element 221, the material is driven to be conveyed forward between the gear-shaped trapezoidal thread elements of the two screws, and is repeatedly rubbed, squeezed, and sheared by the multiple thread ridges 224 on the tooth shapes of the forward thread element 223 and the reverse thread element 222 to realize the splitting and brooming of the material. And through the first groove 225 provided on the thread ridge 224, the rubbing and shearing effects of the forward thread element 223 and the reverse thread element 222 on the material are improved, fiber entanglement is avoided, and the splitting and brooming effect is further enhanced.

[0023] It should be noted that the number of the forward-thread elements 223 and the reverse-thread elements 222 can be set according to actual needs. By adjusting the number of the forward-thread elements 223 and the reverse-thread elements 222, the rubbing, extrusion and shearing time of the material can be adjusted, so as to expand the applicable range. It should be noted that the threads of the reverse-thread elements 222 are in the reverse direction, but they do not drive the material to move in the reverse direction. The function is to make the material have a reverse-moving thrust in a short time, so that the materials are extruded. After extrusion, the material is sent out through the gap between the screw edges 224. Among them, the structures of the forward-thread elements 223 and the reverse-thread elements 222 are similar. They can be mirror-image structures of each other, or there can be structural differences, such as different numbers of screw edges 224, differences in the shapes and sizes of the screw edges 224, etc.

[0024] In addition, the transmission and control mechanism includes a motor 110 and a gearbox 120. The motor 110 drives the two screws to rotate in the same direction through the gearbox 120.

[0025] It can be understood that the screw edge 224 has two inclined surfaces. The first groove 225 can be arranged on a single inclined surface, or the first groove 225 can be arranged on both inclined surfaces. The number of the first grooves 225 on the two inclined surfaces can be equal or unequal. In the circumferential direction of the screw, the first grooves 225 on the two inclined surfaces are staggered, and better rubbing, extrusion and shearing effects can be obtained.

[0026] It can be understood that with reference to Figure 5 and Figure 6 , a second groove 226 is also opened on the upper end surface of the screw edge 224. It can be one second groove 226 or multiple second grooves 226. By opening the second groove 226 on the upper end surface of the screw edge 224, when the forward-thread elements 223 and the reverse-thread elements 222 rotate, through the second groove 226 on the end surface of the screw edge 224, when the material is located between the upper end surface of the screw edge 224 and the inner wall of the front bushing 233, the rubbing and shearing effects of the upper end surface of the screw edge 224 on the material are increased, so as to further improve the filament splitting and brooming effect.

[0027] It can be understood that the front bushing 233 is embedded inside the front barrel 231. Multiple third grooves are opened on the inner wall of the front bushing 233. When the material is rubbed and sheared between the upper end surface of the screw edge 224 and the inner wall of the barrel 230, the third grooves and the second grooves 226 can further improve the rubbing and shearing effects, so as to improve the filament splitting and brooming effect of the material.

[0028] It can be understood that the included angle formed by the intersection of the third groove and the axis of the mandrel 220 can be less than 90 degrees or equal to 90 degrees. When the gear-shaped trapezoidal thread element cooperates with the front bushing 233 to abrade and shear the material, it can prevent the material from directly sliding along the third groove, thereby improving the abrading and shearing effect of the third groove.

[0029] It can be understood that a rear bushing 234 is installed inside the rear barrel 232, and a plurality of bumps arranged in a pineapple shape are provided on the inner wall of the rear bushing 234. The feeding thread element or the fibrillation thread element cooperates with the rear bushing 234, and the plurality of bumps arranged in a pineapple shape can further improve the abrading and shearing effect.

[0030] It can be understood that with reference to Figure 2 , the barrel 230 includes a front barrel 231 and a rear barrel 232. The front barrel 231 and the rear barrel 232 are connected by fasteners. Bolts can be used as the fasteners. Lugs are provided at the ends where the front barrel 231 and the rear barrel 232 are in contact, and the two lugs are fixed by bolts. When disassembly is required, just loosen the bolts, which is convenient for operation.

[0031] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the knowledge scope of those of ordinary skill in the art, various changes can be made without departing from the purpose of the present invention.

Claims

1. A twin-screw tearing machine, consisting of a transmission and control mechanism, a screw, and a barrel, characterized in that: The barrel is connected by bolts with a split connected ∞-shaped front barrel and a non-connected ∞-shaped rear barrel, the front barrel is embedded with a split front bushing with linear grooves on the inner surface, and the rear barrel is embedded with a split rear bushing with pineapple-shaped protrusions on the inner surface; the screw is composed of two parallel and co-rotating core shafts and a feeding thread element, a gear-shaped trapezoidal thread element, a dispersing thread element and a brooming thread element sequentially sleeved on the core shafts, the two screws passing through the front barrel constitute an engaging double-screw tearing and grinding system, and the two screws passing through the rear barrel constitute two single-screw rubbing and grinding systems; at least one first groove is arranged on the two inclined surfaces of the screw ridges of the gear-shaped trapezoidal thread element.

2. The twin-screw tearing mill according to claim 1, characterized in that: The two inclined surfaces of the screw flight are both provided with the first grooves, and the number of the first grooves on the two inclined surfaces is equal.

3. The twin-screw tearing mill according to claim 1, characterized in that: The two inclined surfaces of the screw flight are both provided with the first grooves, the numbers of the first grooves on the two inclined surfaces are different, and the first grooves on the two inclined surfaces are staggered along the circumferential direction of the screw.

4. The twin-screw tearing mill according to any one of claims 1 to 3, characterized in that: The upper end surface of the screw flight is provided with at least one second groove.

5. The twin-screw tearing mill according to claim 1, characterized in that: A front bushing is embedded in the interior of the front barrel, and a plurality of third grooves are arranged on the inner wall of the front bushing.

6. The twin-screw tearing mill according to claim 5, characterized in that: The angle formed by the intersection of the third groove and the axis of the screw is less than or equal to 90 degrees.

7. The twin-screw tearing mill according to claim 1, characterized in that: A rear bushing is embedded in the rear barrel, and a plurality of protrusions arranged in a pineapple shape are arranged on the inner wall of the rear bushing.

8. The twin-screw tearing mill according to claim 1, characterized in that: The front barrel and the rear barrel are split structures, and the front barrel and the rear barrel are fixed as a whole by fasteners.

9. The twin-screw tearing mill according to claim 1, characterized in that: The width of the first groove is greater than or equal to 3 mm and less than or equal to 8 mm.

10. The twin-screw tearing mill according to claim 1, characterized in that: The depth of the first groove is greater than or equal to 2 mm and less than or equal to 5 mm.

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