Coreless rice milling sand roller

Abstract

This utility model relates to a coreless rice milling roller, including a roller body. An axial mounting hole is formed in the middle of the roller body for mounting on a hollow shaft of a rice milling machine. A connecting groove for connecting a fixing plate of the hollow shaft of the rice milling machine is formed on the inner side wall of the upper end of the mounting hole. Two positioning grooves for installing positioning pins are symmetrically formed at both ends of the mounting hole. The upper positioning groove is located below the connecting groove. The roller body is axially divided into an upper section L1, a middle section L2, and a lower section L3. The outer surface of the upper section L1 is an arc surface, the outer surface of the middle section L2 is a cylindrical surface, and the outer surface of the lower section L3 is a downward-curving arc surface. The roller body is made of ceramic. This utility model, by setting the outer surface of the upper section of the roller body to be an arc surface and the lower section to be a center-curving arc surface, avoids the traditional edge structure, effectively reduces stress concentration, lowers the probability of rice grain breakage and defects, lowers the probability of rice grains retaining embryos and skins, and improves the quality of the finished rice grains.

Description

Technical Field

[0001] This utility model relates to the field of rice milling roller technology, specifically a coreless rice milling roller. Background Technology

[0002] Rice milling rollers are cylindrical or truncated conical roller components used in rice milling machinery to mill white rice grains. They are divided into two types: sand rollers and iron rollers, and further into vertical and horizontal sand rollers. Sand rollers operate by grinding and are connected to the hollow shaft of the rice milling machine through a metal fixing sleeve. They have ventilation holes inside and are suitable for low-pressure, high-linear-speed rice milling scenarios. Iron rollers, on the other hand, process rice grains with good outer toughness through high-pressure, low-linear-speed friction.

[0003] Most existing vertical rice milling rollers are cylindrical and need to be connected to the hollow shaft of the rice milling machine via a metal fixing sleeve. During rice milling, the grains move from the top to the bottom of the roller, and stress concentration is likely to occur at the edges of the top and bottom of the roller. This results in a higher probability of rice grains breaking into broken rice or rice grain defects, as well as an increase in the retention rate of germ and husk, which affects the quality of the finished rice grains. In addition, rice grains milled by traditional sand rollers and iron rods have lower whiteness. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a coreless rice milling roller to address the above-mentioned shortcomings.

[0005] To solve the above technical problems, the present invention adopts the following technical solution:

[0006] A coreless rice milling roller includes a roller body with an axially oriented mounting hole in the middle of the roller body for mounting on a hollow shaft of a rice milling machine. The upper inner wall of the mounting hole has a connecting groove for connecting a fixing plate of the hollow shaft of the rice milling machine. Two symmetrical positioning grooves for installing positioning pins are provided at both the upper and lower ends of the mounting hole, with the upper positioning groove located below the connecting groove. The roller body is axially divided into an upper section L1, a middle section L2, and a lower section L3. The outer surface of the upper section L1 is an arc surface, the outer surface of the middle section L2 is a cylindrical surface, and the outer surface of the lower section L3 is a downwardly curved arc surface. The roller body is made of ceramic material.

[0007] Furthermore, the height of the upper section L1 of the roller is less than the height of the lower section L3.

[0008] Compared with the prior art, the present invention, by adopting the above technical solution, has the following advantages:

[0009] This invention features a roller with an arc-shaped outer surface on the upper section and an arc-shaped surface that curves towards the center on the lower section. This design avoids the traditional edge structure, effectively reduces stress concentration, lowers the probability of rice grain breakage and defects, reduces the probability of rice grains retaining embryos and skins, and improves the quality of finished rice grains.

[0010] The roller mounting hole is directly connected to the hollow shaft of the rice milling machine. A connecting groove is opened on the inner side wall of the upper end for connecting the fixing plate of the hollow shaft of the rice milling machine. A positioning groove is symmetrically opened on the inner side of the connecting groove for installing the positioning pin. There is no need to connect to the hollow shaft of the rice milling machine through a metal fixing sleeve, which makes the connection between the sand roller and the rice milling machine simpler and more convenient, and facilitates installation and disassembly.

[0011] The rollers are made of ceramic, which helps to improve the rice milling process and increase the whiteness of the milled rice grains.

[0012] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the present invention;

[0014] Figure 2 This is a top view of the present invention;

[0015] Figure 3 This is a bottom view of the present invention;

[0016] Figure 4 This is a cross-sectional view of the connection structure between the present invention and the central axis.

[0017] The attached diagram lists the components represented by each number as follows:

[0018] 1. Roller body; 2. Connecting groove; 3. Positioning groove; 4. Arc surface; 5. Cylindrical surface; 6. Curved surface. Detailed Implementation

[0019] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0020] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] like Figure 1-4As shown, a coreless rice milling roller includes a roller body 1. An axial mounting hole is provided in the middle of the roller body 1 for mounting on a hollow shaft of a rice milling machine. A connecting groove 2 for connecting a fixing plate of the hollow shaft of the rice milling machine is provided on the inner side wall of the upper end of the mounting hole. Two positioning grooves 3 for installing positioning pins are symmetrically provided at both the upper and lower ends of the mounting hole. The upper positioning groove 3 is located below the connecting groove 2. The roller body 1 is axially divided into an upper section L1, a middle section L2, and a lower section L3. The outer surface of the upper section L1 of the roller body 1 is an arc surface 4, the outer surface of the middle section L2 of the roller body 1 is a cylindrical surface 5, and the outer surface of the lower section L3 of the roller body 1 is a downwardly curved arc surface 6. The roller body 1 is made of ceramic material.

[0022] In one embodiment, the height of the upper section L1 of the roller body 1 is less than the height of the lower section L3.

[0023] The working process of this utility model is as follows: Align the mounting hole of the coreless rice milling roller 1 with the hollow shaft of the rice milling machine, and insert the hollow shaft into the mounting hole to complete the initial positioning.

[0024] Positioning pins are installed in the positioning grooves 3 symmetrically opened inside the connecting groove 2. The positioning pins play a role in precise fixing and positioning, ensuring that the connection between the roller body 1 and the hollow shaft and fixed plate of the rice milling machine is stable and the position is accurate, preventing relative movement during operation.

[0025] The fixing plate of the hollow shaft of the rice milling machine is placed into the connecting groove 2 opened on the inner side wall of the upper end of the roller body 1. By matching the shape and size of the connecting groove 2 with the fixing plate, a stable connection between the fixing plate and the roller body 1 is achieved.

[0026] The grains to be processed enter the rice mill through the feeding device and reach the working area of ​​the coreless rice milling roller.

[0027] The grain first contacts the outer side of the arc surface 4 of the upper section L1 of the roller body 1. Under the power provided by the rice milling machine, the grain and the roller body 1 move relative to each other. The design of the arc surface 4 of the upper section L1 of the roller body 1 makes the grain more uniform in the grinding process, reducing the breakage of rice grains caused by stress concentration. At the same time, the surface of the grain begins to be initially ground.

[0028] As the grains move downwards, they enter the outer surface region of the cylindrical surface 5 in the middle section L2 of roller body 1. The cylindrical surface 5 provides a stable grinding surface, where the grains are subjected to continuous and uniform grinding action, further removing the bran layer on the surface of the grains and gradually turning the rice grains white.

[0029] The grains continue downwards to the outer side of the curved surface 6 of the lower section L3 of roller 1, which bends towards the center. This curved surface 6 design avoids the stress concentration problem caused by the lower edge of traditional sand rollers, reducing the generation of broken and defective grains.

[0030] The thoroughly whitened rice grains are discharged from the rice milling machine through the discharge device, completing the entire rice milling process.

[0031] The above description provides examples of the preferred embodiments of this utility model. Any aspects not detailed herein are common knowledge to those skilled in the art. The scope of protection of this utility model is determined by the claims. Any equivalent modifications based on the technical teachings of this utility model are also within the scope of protection of this utility model.

Claims

1. A coreless rice milling roller, characterized in that, The roller body (1) includes an axial mounting hole in the middle of the roller body (1), which is used to fit on the hollow shaft of the rice milling machine. The upper inner wall of the mounting hole is provided with a connecting groove (2) for connecting the fixing plate of the hollow shaft of the rice milling machine. The upper and lower ends of the mounting hole are symmetrically provided with two positioning grooves (3) for installing positioning pins. The upper positioning groove (3) is located below the connecting groove (2). The roller body (1) is divided into an upper section L1, a middle section L2 and a lower section L3 in the axial direction. The outer side of the upper section L1 of the roller body (1) is an arc surface (4). The outer side of the middle section L2 of the roller body (1) is a cylindrical surface (5). The outer side of the lower section L3 of the roller body (1) is a downward curved arc surface (6). The roller body (1) is made of ceramic material.

2. The coreless rice milling roller according to claim 1, characterized in that, The height of the upper section L1 of the roller body (1) is less than the height of the lower section L3.

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