Press roller shell of granulator

Abstract

The utility model discloses a compression roller shell of a granulator, which relates to the technical field of granulators and comprises a compression roller shell blank, a wear-resistant layer structure is arranged on the peripheral side of the compression roller shell blank and comprises two wear-resistant rings and a plurality of wear-resistant strips, the two wear-resistant rings are respectively welded at two ends of the compression roller shell blank in the axial direction, and the wear-resistant strips are welded at two ends of the compression roller shell blank in the axial direction. The wear-resisting strips are welded to the compression roller shell blank at intervals in the circumferential direction of the compression roller shell blank, the two ends of each wear-resisting strip are connected with the two wear-resisting rings correspondingly, any two adjacent wear-resisting strips and the two wear-resisting rings located at the two ends of the compression roller shell blank in the axial direction define a tooth groove, and the wear-resisting rings and the wear-resisting strips are made of wear-resisting welding wires. The problems that in the prior art, due to the fact that a compression roller shell is manufactured in a material reducing machining mode, the compression roller shell can only be scrapped after being abraded due to long-term use and cannot be recycled, repaired and utilized, and a large number of resources and cost are wasted are solved; and the service life of the compression roller shell which can be normally used is short.

Description

Technical Field

[0001] The utility model belongs to the technical field of granulators, and particularly relates to a pressure roller shell of a granulator. Background Art

[0002] The pressure roller is one of the main working components of the granulator. The pressure roller shell is the most core part of the pressure roller. It is used in cooperation with the ring die of the granulator. When the ring die rotates under the action of power, the material in the pressing area between the two will transfer the frictional torque to the pressure roller assembly to make the pressure roller shell rotate. While the pressure roller shell extrudes the material through the ring die holes to form granular materials, the material will cause wear to the pressure roller shell.

[0003] The existing pressure roller shells have the following two deficiencies:

[0004] 1. In the current processing of the pressure roller shell, it is all subtractive processing, that is, the unnecessary parts are removed from the outer peripheral side of the pressure roller shell blank by methods such as hobbing, drilling or wire drawing to form the groove tooth structure of the working surface of the pressure roller shell. After the wear-resistant layer is worn during the long-term use of the pressure roller shell, it can only be scrapped and cannot be recycled and repaired, wasting a large amount of resources and costs.

[0005] 2. In order to control the manufacturing cost of the pressure roller shell, a base material with too high hardness is usually not selected to make the pressure roller shell blank. Instead, carbonitriding heat treatment is carried out on the working surface of the pressure roller shell to form a hardened layer on the surface of the groove tooth structure of the working surface of the pressure roller shell. However, the thickness of the hardened layer is much smaller than the groove depth of the groove tooth structure of the working surface. When the hardened layer is worn off, since the hardness of the base material is weaker than that of the hardened layer, the wear rate of the pressure roller shell is much greater than the wear rate of the hardened layer, resulting in a shorter service life of the pressure roller shell that can be used normally. Content of the Utility Model

[0006] The purpose of the utility model is to provide a pressure roller shell of a granulator, so as to overcome the technical problems in the prior art that because the pressure roller shell is made by subtractive processing, the pressure roller shell can only be scrapped after being worn during long-term use, cannot be recycled and repaired, wasting a large amount of resources and costs, and because the thickness of the hardened layer on the working surface of the pressure roller shell is much smaller than the groove depth of the groove tooth structure of the working surface, the service life of the pressure roller shell that can be used normally is short. The specific technical solutions are as follows:

[0007] A pressure roller shell of a granulator, including a circular ring-shaped pressure roller shell blank, a wear-resistant layer structure is arranged on the outer peripheral side of the pressure roller shell blank. The wear-resistant layer structure includes wear-resistant rings and wear-resistant strips. The wear-resistant rings are arranged at the opposite ends of the pressure roller shell blank. A plurality of the wear-resistant strips are welded at intervals along the circumferential direction of the pressure roller shell blank, and the opposite ends of each wear-resistant strip are connected to the wear-resistant rings. The materials of the wear-resistant rings and the wear-resistant strips are both welded with wear-resistant welding wires.

[0008] Preferably, one end of the wear-resistant ring close to the end of the roller shell blank is flush with the end of the roller shell blank.

[0009] Preferably, the wear-resistant strips are evenly distributed at equal intervals along the circumferential direction of the roller shell blank.

[0010] Preferably, the materials of the wear-resistant ring and the wear-resistant strips are wear-resistant welding wires with a hardness not lower than 55HRC.

[0011] Preferably, any two adjacent wear-resistant strips and the wear-resistant rings at both axial ends of the roller shell blank enclose a tooth groove. Defining the groove depth of the tooth groove as h, then h≥3.5mm is satisfied.

[0012] Preferably, the material of the roller shell blank is one of 40Cr steel, 45# steel, GCr12 steel or GCr15 steel.

[0013] Preferably, an annular fitting groove is provided inside the roller shell blank.

[0014] Compared with the existing technology, the utility model has the following beneficial effects:

[0015] 1. A granulator roller shell provided by the utility model forms a new type of roller shell by welding wear-resistant strips and wear-resistant rings on the circumferential surface of the shell blank. This new type of roller shell is more wear-resistant than the roller shell manufactured by the conventional methods of hobbing, drilling or wire drawing. And when it is worn after use, it can be recycled, repaired and reused, greatly improving the service life of the roller shell and saving the production cost.

[0016] 2. The number of teeth and the tooth pitch in the roller shell of the utility model can be formulated according to specific situations, so the production is convenient and fast, thereby improving the production efficiency.

[0017] 3. In the utility model, the hardness of the welded tooth height can be made higher than 55HRC for the entire tooth height (≥3.5mm). Compared with the previous hardened layer (about 1mm) with a hardness of about 60HRC, it has better wear resistance and a longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for description in the embodiments. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to actual scale.

[0019] Figure 1 It is a schematic structural diagram of the present utility model.

[0020] Main reference numeral description:

[0021] 10 - Pressure roller shell blank, 11 - Annular fitting groove, 20 - Wear-resistant layer structure, 21 - Wear-resistant ring, 22 - Wear-resistant strip, 23 - Tooth groove. Detailed implementation manner

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "top surface", "bottom surface", "inner", "outer", "inner side", "outer side", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It 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 cannot be understood as a limitation to the present invention.

[0024] In the description of the present invention, the meaning of "several" is one or more, and the meaning of "multiple" is two or more. Understandings such as "greater than", "less than", "exceeding", etc. do not include the present number, and understandings such as "above", "below", "within", etc. include the present number. If there are descriptions of the terms "first", "second", "third", etc., they are only for the purpose of description and distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0025] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "setting" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. The following will explain the embodiments according to the overall structure of the present invention.

[0026] Embodiment

[0027] Such as Figure 1As shown in the figure, an embodiment of the present application provides a granulator roller shell, which includes an annular roller shell blank 10, and a wear-resistant layer structure 20 is provided on the outer peripheral side of the roller shell blank 10. The wear-resistant layer structure 20 includes two wear-resistant rings 21 and a plurality of wear-resistant strips 22.

[0028] Among them, the material of the roller shell blank 10 is one of 40Cr steel, 45# steel, GCr12 steel or GCr15 steel. In actual application, in order to control costs, the material of the roller shell blank 10 is preferably 40Cr steel or 45# steel.

[0029] The two wear-resistant rings 21 are respectively welded to both ends of the roller shell blank 10 in the axial direction.

[0030] Specifically, one end of the wear-resistant ring 21 close to the end of the roller shell blank 10 is flush with the end of the roller shell blank 10, that is, the left end face of the wear-resistant ring 21 located at the left end of the roller shell blank 10 is flush with the left end of the roller shell blank 10, and the right end face of the wear-resistant ring 21 located at the right end of the roller shell blank 10 is flush with the right end face of the roller shell blank 110.

[0031] Among them, the material of the wear-resistant ring 21 is wear-resistant welding wire. When manufacturing the granulator roller shell of the present application, the wear-resistant welding wire is welded to both ends of the roller shell blank 10 through a carbon dioxide gas shielded welding machine to form the two wear-resistant rings 21. In order to improve the service life of the present application, the hardness of the wear-resistant welding wire for making the wear-resistant ring 21 should be greater than 55HRC, preferably 56 - 57HRC.

[0032] A plurality of the wear-resistant strips 22 are welded to the roller shell blank 10 at intervals along the circumferential direction of the roller shell blank 10, and both ends of each of the plurality of wear-resistant strips 22 are respectively connected to the two wear-resistant rings 21.

[0033] Specifically, the plurality of wear-resistant strips 22 are evenly distributed on the outer peripheral side of the roller shell blank 10 along the circumferential direction of the roller shell blank 10.

[0034] Among them, the material of the wear-resistant strip 22 is wear-resistant welding wire. When manufacturing the granulator roller shell of the present application, a plurality of wear-resistant welding wires are welded to the outer peripheral side of the roller shell blank 10 at equal intervals along the circumferential direction of the roller shell blank 10 through a carbon dioxide gas shielded welding machine to form the plurality of wear-resistant strips 22. In order to improve the service life of the present application, the hardness of the wear-resistant welding wire for making the wear-resistant strip 22 should be greater than 55HRC, preferably 56 - 57HRC.

[0035] Any two adjacent wear-resistant strips 22 and the two wear-resistant rings 21 located at both ends of the roller shell blank 10 in the axial direction enclose a tooth groove 23.

[0036] Among them, the groove depth of the tooth groove 23 is defined as h, and it satisfies h≥3.5mm. The tooth groove 23 can be a straight groove, a herringbone groove, or other shapes such as a flat oval groove. The specific shape of the tooth groove 23 can be changed according to actual needs. The tooth groove 23 is used to reduce the wear of the roller shell, improve the feed pressing efficiency and product quality.

[0037] In some embodiments, an annular fitting groove 11 is provided inside the roller shell blank 10, and the annular fitting groove 11 is used for seamless fitting during roller installation.

[0038] Taking the roller shell of a Shepherd 600 granulator as an example, the weight of the roller shell is about 32 kg, there are 106 teeth in total, the diameter of the roller shell is 0.265 meters, and the width of the roller shell is 0.175 meters. If 40Cr steel is used as the base material to make a new roller shell, the unit price is about 350 - 450 yuan. If GCr15 steel is used as the base material to make a new roller shell, the unit price is about 500 - 600 yuan. For the roller shell of the present application, assuming that the wear-resistant layer structure is completely worn out, the roller shell is recycled, repaired and reused with wear-resistant welding wire. The cost of the wear-resistant welding wire is 5 yuan / m. Therefore, the total wear-resistant welding wire required for the entire wear-resistant layer is 0.175 * 106 + 2 * 3.1415 * 0.1325 * 2 = 20.22 meters, and the total welding cost is 20.22 * 5 = 101.1 yuan. Adding the consumable cost and labor cost for precision grinding the wear-resistant layer structure, the cost of refurbishing a roller shell is less than 150 yuan, which is much lower than the cost required to make a new roller shell or purchase a new roller shell.

[0039] In summary, a roller shell of a granulator provided by an embodiment of the present application is provided. By providing a wear-resistant layer structure including two wear-resistant rings and a plurality of wear-resistant bars on the outer peripheral side of the roller shell blank, and the wear-resistant rings and wear-resistant bars are made of wear-resistant welding wires. The two wear-resistant rings are respectively welded to both ends of the roller shell blank in the axial direction, and the plurality of wear-resistant bars are welded to the roller shell blank at intervals in the circumferential direction of the roller shell blank, and both ends of each wear-resistant bar are respectively connected to the two wear-resistant rings. The two wear-resistant rings and the plurality of wear-resistant bars together form a tooth structure of the working surface of the roller shell. By welding a wear-resistant layer structure formed by wear-resistant welding wires on the outer peripheral side of the roller shell blank to replace the method of removing unnecessary parts on the outer peripheral side of the roller shell blank by material reduction processing in the prior art to form the tooth structure of the working surface, when the wear-resistant layer is worn, only the wear-resistant layer needs to be replenished and repaired by reusing the wear-resistant welding wire, and then the recycling and reuse of the roller shell can be completed, solving the technical problem in the prior art that because the roller shell is made by the method of material reduction processing, after the roller shell is worn during long-term use, it can only be scrapped and cannot be recycled and repaired, wasting a large amount of resources and costs. At the same time, since the tooth structure of the working surface of the roller shell of the present application is entirely formed by wear-resistant welding wires, there is no need to perform hardening treatment on the working surface of the roller shell, saving production costs and greatly increasing the service life of the roller shell.

[0040] The foregoing description of the specific exemplary embodiments of the present invention is for the purposes of illustration and exemplification. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it is obvious that many changes and variations can be made in accordance with the above teachings. Although the embodiments of the present invention have been shown and described, the specific embodiments are merely interpretations of the present invention and not limitations thereof. The specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical applications, so that those skilled in the art can, after reading this specification, make modifications, substitutions, variations, and various different selections and changes that do not make creative contributions to the embodiments as needed, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A pelletizing machine roller shell, comprising a ring-shaped roller shell blank (10), characterized in that: The outer peripheral side of the roller shell blank (10) is provided with a wear-resistant layer structure (20), and the wear-resistant layer structure (20) includes a wear-resistant ring (21) and a wear-resistant strip (22). The wear-resistant ring (21) is provided on the opposite ends of the roller shell blank (10), and a plurality of the wear-resistant strips (22) are welded at intervals along the circumferential direction of the roller shell blank (10), and the opposite ends of each wear-resistant strip (22) are connected to the wear-resistant ring (21), and the wear-resistant ring (21) and the wear-resistant strip (22) are both made of wear-resistant welding wire.

2. A pelletizer roller shell according to claim 1, characterized in that: One end of the wear-resistant ring (21) close to the end of the roller shell blank (10) is flush with the end of the roller shell blank (10).

3. A granulator roller shell according to claim 1, characterized in that: The wear-resistant strips (22) are distributed at equal intervals along the circumferential direction of the roller shell blank (10).

4. A granulator roller shell according to claim 1, characterized in that: The wear-resistant ring (21) and the wear-resistant strip (22) are made of wear-resistant welding wire with a hardness of not less than 55HRC.

5. A pelletizer roller shell according to claim 1, characterized in that: Any two adjacent wear-resistant strips (22) and the wear-resistant rings (21) at both ends of the roller shell blank (10) in the axial direction form a tooth groove (23), and the groove depth of the tooth groove (23) is defined as h, then h≥3.5mm is satisfied.

6. A granulator roller shell according to claim 1, characterized in that: The material of the roller shell blank (10) is one of 40Cr steel, 45# steel, GCr12 steel or GCr15 steel.

7. A pelletizer roller shell according to claim 1, characterized in that: An annular fitting groove (11) is provided inside the roller shell blank (10).

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