Grinding disc for grain moisture test crushing mill

Abstract

The utility model discloses a millstone for a grain moisture test crushing mill in the field of crushing equipment, which comprises a static millstone and a movable millstone, a plurality of gear rings which are of concentric circle structures and can be meshed with each other are respectively arranged on the opposite surfaces of the static millstone and the movable millstone, and a plurality of large gear rings close to the inside are wider and higher than a plurality of small gear rings close to the outside. And a plurality of material guide grooves which penetrate through all the gear rings and divide the gear rings into a plurality of gear blocks are further formed in the opposite surfaces of the static grinding disc and the movable grinding disc. The gear rings and the material guide grooves are arranged on the static grinding disc and the movable grinding disc, materials move outwards along the material guide grooves and gaps among the teeth in the grinding process and are ground by the tooth blocks when passing through the connecting portions of the adjacent gear rings, meanwhile, due to the fact that the gaps of the large gear rings on the inner side are large, large particles are crushed firstly, the gaps of the small gear rings on the outer side are small, and then the particles are ground into powder, and the grinding efficiency is greatly improved. And the powder fineness is ensured, the high powder discharging efficiency is achieved, the problem that the temperature rise is too large due to too fast grinding can be avoided, and the moisture loss in the grinding process is reduced.

Description

Technical Field

[0001] This utility model relates to the field of pulverizing equipment, and in particular to a grinding disc for a grain moisture testing pulverizer. Background Technology

[0002] The grain moisture testing pulverizer is an essential piece of equipment for preparing samples for moisture determination of various grains and legumes. It is also a commonly used pretreatment device for detecting heavy metals and mycotoxins in grains. The specific structure is shown in patent document CN217288629U. The pulverizing structure of the equipment is as follows: Figure 1 As shown, it mainly includes a pair of grinding discs, one of which is a stationary grinding disc 1, and the other is a moving grinding disc 2. The two grinding discs are arranged opposite each other in a horizontal direction. The stationary grinding disc 1 is fixed on an adjustment mechanism inside the equipment, which allows it to move along its axis. The moving grinding disc 2 is fixed on the rotating shaft of a motor. During operation, the grain sample enters the central cavity between the two grinding discs through the feed inlet 4 on the stationary grinding disc 1. The motor drives the moving grinding disc 2 to rotate, and the sample between the grinding discs is cut and ground, and then discharged as powder from the lower edge of the grinding disc under the action of gravity. The specific structure of the existing grinding disc is as follows. Figure 2 As shown, the edges of the opposite surfaces of the two grinding discs are provided with many fine teeth, which are mainly used to grind materials by the mutual friction between the fine teeth.

[0003] The main problems with existing grinding discs during use are as follows: to ensure powder fineness, the gap between the moving and stationary grinding discs needs to be adjusted to be very small so that they can directly rub against each other. After the material is ground between the teeth, the small gap between the fine teeth leads to low powder output efficiency and easy material blockage. On the other hand, to ensure efficiency, the gap between the moving and stationary grinding discs needs to be widened, which in turn leads to insufficient fineness. Different grinding discs and tooth shapes result in different moisture contents in the pulverized samples. In actual practice, the grinding discs for grain moisture testing should be designed to generate as little heat as possible and cause minimal moisture loss. Utility Model Content

[0004] To overcome the aforementioned shortcomings of existing grinding discs, the technical problem to be solved by this utility model is to provide a grinding disc for grain moisture testing and pulverizing that can meet the fineness requirements, while having high powder output efficiency and good water retention performance.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] The grinding disc for grain moisture testing includes a stationary grinding disc and a moving grinding disc arranged opposite each other in a horizontal direction. A receiving cavity is provided in the middle of the stationary and moving grinding discs. A feed inlet connected to the receiving cavity is provided on the stationary grinding disc. Multiple concentric toothed rings are provided on the opposite surfaces of the stationary and moving grinding discs outside the receiving cavity. The toothed rings on the stationary and moving grinding discs can mesh with each other, with the innermost toothed rings being larger and the outermost toothed rings being smaller. The larger toothed rings are wider and taller than the smaller toothed rings. Multiple guide grooves are also arranged in a circular array around the center of the opposite surfaces of the stationary and moving grinding discs. The guide grooves penetrate all the toothed rings, dividing them into multiple tooth blocks.

[0007] Furthermore, all gear rings have a trapezoidal cross-section, with the angle between the bottom surface of the gear ring and the two inclined surfaces being 30-60°.

[0008] Furthermore, the large gear ring includes 4-5 gear rings, and the small gear ring includes 2-3 gear rings.

[0009] Furthermore, the tooth root width of the large gear ring is 7-10mm, the height is 6-8mm, and the tooth root spacing between adjacent large gear rings is 2.5-3mm; the tooth root width of the small gear ring is 3-5mm, the height is 2-3mm, and the tooth root spacing between adjacent small gear rings is 2-2.5mm.

[0010] Furthermore, the guide groove is divided into a large-tooth guide groove and a small-tooth guide groove. The large-tooth guide groove runs through all the large tooth rings, and its width is 2-3 mm. The length of the large tooth blocks separated by the large tooth rings is 2-3 mm. The small-tooth guide groove runs through all the small tooth rings, and its width is 1-2 mm. The length of the small tooth blocks separated by the small tooth rings is 1-2 mm.

[0011] Furthermore, the length directions of the large-tooth guide groove and the small-tooth guide groove are respectively angled by 3-5° with the radial direction passing through their centers, and are biased towards the rotation direction of the moving grinding disc.

[0012] Furthermore, multiple guide grooves are arranged in a ring array around the center of the large gear ring between the outer side and the innermost side of the receiving cavity of the stationary grinding disc and the moving grinding disc.

[0013] The beneficial effects of this utility model are as follows: By setting multiple concentric toothed rings that can mesh with each other on the opposite surfaces of the stationary and moving grinding discs, and setting multiple guide grooves to divide the toothed rings into multiple tooth blocks, during the crushing process, the material moves outward from the gap between the guide grooves and the toothed rings under its own gravity and centrifugal force, and is ground by the tooth blocks when passing through the connecting parts of adjacent toothed rings. At the same time, because the gap of the large inner toothed rings is large, the large particles are crushed first, and the gap of the small outer toothed rings is small, so the particles are ground into powder later. This ensures the fineness of the powder, has a high powder output efficiency, avoids the problem of excessive temperature rise caused by excessively fast grinding, and reduces the moisture loss during the grinding process. Attached Figure Description

[0014] Figure 1 This is an assembly diagram of an existing grinding mill disc;

[0015] Figure 2 It is the existing grinding disc structure of a crushing mill;

[0016] Figure 3 This is a static grinding disc of the present invention;

[0017] Figure 4 This is the moving grinding disc of this utility model;

[0018] Figure 5 This is a schematic diagram of the combination of the moving grinding disc and the stationary grinding disc of this utility model;

[0019] Figure 6 This is a schematic diagram of the structure of the moving grinding disc and the stationary grinding disc of this utility model when they are meshing;

[0020] Figure 7 yes Figure 4 Enlarged view of part A in the middle.

[0021] The markings in the diagram are as follows: 1- stationary grinding disc, 2- moving grinding disc, 3- receiving cavity, 4- feed inlet, 5- large gear ring, 6- small gear ring, 7- guide groove, 8- guide groove, 51- large gear block, 61- small gear block, 71- large gear guide groove, 72- small gear guide groove. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] It should be noted that if this utility model contains directional indicators such as up, down, left, right, front, and back, these are used to describe the relative positional relationships between components and are not specific references to the absolute positions of related components or the positional relationships between components. They are only used to explain the relative positional relationships and movement of components in a specific posture. If the specific posture changes, the directional indicator will also change accordingly. If this utility model contains terms related to quantity, such as "many," "multiple," or "several," these specifically refer to two or more.

[0024] like Figure 3-6 As shown, the grinding disc for grain moisture testing provided by this utility model includes a stationary grinding disc 1 and a moving grinding disc 2 arranged opposite each other in a horizontal direction. A receiving cavity 3 is provided in the middle of the stationary grinding disc 1 and the grinding disc 2. A feed inlet 4 communicating with the receiving cavity 3 is provided on the stationary grinding disc 1. Multiple concentric toothed rings are respectively provided on the opposite surfaces of the stationary grinding disc 1 and the moving grinding disc 2 outside the receiving cavity 3. The toothed rings on the stationary grinding disc 1 and the moving grinding disc 2 can mesh with each other. The innermost toothed rings are large toothed rings 5, and the outermost toothed rings are small toothed rings 6. The large toothed rings 5 ​​are wider and higher than the small toothed rings 6. Multiple guide grooves 7 are also arranged in a circular array around the center of the opposite surfaces of the stationary grinding disc 1 and the moving grinding disc 2. The guide grooves 7 penetrate all the toothed rings, dividing them into multiple tooth blocks. The tooth base of the small toothed ring 6 is higher than that of the large toothed ring 5, and the tooth tip is lower than that of the large toothed ring, ensuring that all the toothed rings on the stationary grinding disc 1 and the moving grinding disc 2 can fully mesh. Figure 5 , Figure 6 As shown.

[0025] The crushing process of this utility model is as follows: First, the gap between the stationary grinding disc 1 and the moving grinding disc 2 is adjusted to a suitable position according to the type of material to be crushed. Then, the material is placed into the receiving cavity 3 between the stationary grinding disc 1 and the moving grinding disc 2 through the feed inlet 4 of the stationary grinding disc 1. After that, the moving grinding disc 2 is rotated, and the material moves outward from the gap between the guide groove 7 and the tooth ring under the action of gravity and centrifugal force. When passing through the connecting part of the adjacent tooth ring, it is ground by the tooth blocks. At the same time, because the gap of the meshing part of the inner large tooth ring 5 is large, the large particles of material will be ground into small particles first, and the gap of the outer small tooth ring is small, so the small particles can be ground into powder. Therefore, the method of coarse crushing followed by fine grinding in this utility model can not only ensure the fineness of the powder and improve the crushing efficiency, but also allow the powder to be quickly discharged under the action of the guide groove 7 and centrifugal force, without the occurrence of material blockage. At the same time, the step-by-step crushing and fine grinding process can avoid the problem of excessive temperature rise caused by excessively rapid grinding and reduce the moisture loss during the grinding process.

[0026] To avoid interference between the gear rings of the stationary grinding disc 1 and the moving grinding disc 2 due to machining errors, the cross-sections of all large gear rings 5 ​​and small gear rings 6 are trapezoidal, with the angle between the bottom surface of the gear ring and the two inclined surfaces being 30-60°. The trapezoidal tooth surface allows the gear blocks of the stationary grinding disc 1 and the moving grinding disc 2 to form a V-shaped shear structure when rotating relative to each other, thereby improving the grinding effect. In addition, the inclined surfaces on both sides also facilitate the outward movement of powder under centrifugal force, preventing powder residue in the gaps between the gear rings.

[0027] For the design of the large toothed ring 5 and the small toothed ring 6, a structure in which the toothed rings gradually increase in size from the inside to the outside can be adopted, but this will be somewhat difficult to manufacture. Considering both cost and pulverizing effect, after multiple experiments, this utility model found that setting 4-5 large toothed rings 5 ​​of the same size and 2-3 small toothed rings 6 of the same size can achieve a good pulverizing effect on grains, soybeans, corn, etc.

[0028] Specifically, the large gear ring 5 and the small gear ring 6 can adopt the following parameters: the tooth root width of the large gear ring 5 is 7-10mm, the height is 6-8mm, and the tooth root spacing between adjacent large gear rings 5 ​​is 2.5-3mm; the tooth root width of the small gear ring 6 is 3-5mm, the height is 2-3mm, and the tooth root spacing between adjacent small gear rings 6 is 2-2.5mm. These parameters are mainly used to control the gap between the gear rings to achieve the effect of coarse crushing followed by fine grinding, and to ensure that the final powder fineness meets the requirements for moisture content and other detection parameters.

[0029] For the feed chute 7, its main influence is the rate at which material passes through the toothed ring. If it is too large, the material will pass through the toothed ring quickly, resulting in poor crushing effect; if it is too small, it will affect the powder output efficiency. Therefore, a further solution is that the feed chute 7 is divided into a large-tooth feed chute 71 and a small-tooth feed chute 72. The large-tooth feed chute 71 runs through all the large toothed rings 5, and its width is 2-3 mm. The length of the large toothed blocks 51 separated by the large toothed rings 5 ​​is 2-3 mm. The small-tooth feed chute 72 runs through all the small toothed rings 6, and its width is 1-2 mm. The length of the small toothed blocks 61 separated by the small toothed rings 6 is 1-2 mm. To reduce the processing difficulty, each large-tooth feed chute 71 and small-tooth feed chute 72 is machined in one pass using a milling cutter. The larger large-tooth feed chute 71 allows small particles to pass through quickly, achieving rapid crushing of the material, while the smaller small-tooth feed chute 72 allows small particles to pass through slowly, achieving fine grinding.

[0030] Furthermore, considering the movement of materials under centrifugal force, to improve powder output efficiency, the guide trough 7 can be configured as an eccentric structure. Specifically, the length directions of the large-tooth guide trough 71 and the small-tooth guide trough 72 form angles of 3-5° with the radial direction passing through their centers, and are biased towards the rotation direction of the moving grinding disc 2. In addition, to ensure the material in the receiving cavity 3 smoothly enters the toothed ring for grinding, multiple guide grooves 8 are arranged in a circular array around the center of the large toothed ring 5 from the outer side to the innermost side of the receiving cavity 3 of the stationary grinding disc 1 and the moving grinding disc 2. The guide grooves 8 must be connected to the large-tooth guide trough 71, and can also adopt an eccentric structure like the guide trough 7, thereby improving grinding efficiency.

[0031] In summary, this invention modifies the existing grain moisture testing and grinding mill's grinding disc by incorporating multiple concentric toothed rings that mesh with each other on the opposing surfaces of the stationary grinding disc 1 and the moving grinding disc 2. Multiple guide grooves 7 divide the toothed rings into multiple toothed blocks. During the grinding process, the material moves outward along the gaps between the guide grooves 7 and the toothed rings under its own gravity and centrifugal force, and is ground by the toothed blocks at the connection points of adjacent toothed rings. Simultaneously, due to the larger gaps in the inner toothed rings, larger particles are crushed first, while the smaller gaps in the outer toothed rings grind the particles into powder later. This ensures both fine powder and improved powder output efficiency, while minimizing moisture loss. Comparative tests show that compared to existing grinding discs, this invention increases grinding efficiency by 200% and further improves grinding fineness, increasing the sieve pass rate on a 40-mesh sieve by approximately 8% compared to existing grinding discs. Regarding moisture, moisture loss is reduced by 0.1%-0.2%. Therefore, the grinding disc structure of this invention has excellent practicality and application prospects.

Claims

1. A grinding disc for a grain moisture testing mill, comprising a stationary grinding disc (1) and a moving grinding disc (2) arranged opposite each other in a horizontal direction, wherein a receiving cavity (3) is provided in the middle of the stationary grinding disc (1) and the moving grinding disc (2), and a feed inlet (4) communicating with the receiving cavity (3) is provided on the stationary grinding disc (1), characterized in that: On the opposite surfaces of the stationary grinding disc (1) and the moving grinding disc (2), outside the receiving cavity (3), there are multiple concentric toothed rings. The toothed rings on the stationary grinding disc (1) and the moving grinding disc (2) can mesh with each other. The inner toothed rings are large toothed rings (5), and the outer toothed rings are small toothed rings (6). The large toothed rings (5) are wider and higher than the small toothed rings (6). On the opposite surfaces of the stationary grinding disc (1) and the moving grinding disc (2), there are also multiple guide grooves (7) arranged in a ring array around their center. The guide grooves (7) penetrate all the toothed rings and divide the toothed rings into multiple toothed blocks.

2. The grinding disc for a grain moisture testing mill as described in claim 1, characterized in that: All large gear rings (5) and small gear rings (6) have trapezoidal cross sections, and the angle between the bottom surface of the gear ring and the two inclined surfaces is 30-60°.

3. The grinding disc for a grain moisture testing mill as described in claim 2, characterized in that: The large gear ring (5) includes 4-5 gear rings, and the small gear ring (6) includes 2-3 gear rings.

4. The grinding disc for a grain moisture testing mill as described in claim 3, characterized in that: The tooth root width of the large gear ring (5) is 7-10mm, the height is 6-8mm, and the tooth root spacing between adjacent large gear rings (5) is 2.5-3mm. The tooth root width of the small gear ring (6) is 3-5mm, the height is 2-3mm, and the tooth root spacing between adjacent small gear rings (6) is 2-2.5mm.

5. The grinding disc for a grain moisture testing mill as described in any one of claims 1-4, characterized in that: The guide groove (7) is divided into a large tooth guide groove (71) and a small tooth guide groove (72). The large tooth guide groove (71) runs through all the large tooth rings (5). The width of the large tooth guide groove (71) is 2-3 mm. The length of the large tooth blocks (51) separated from the large tooth rings (5) is 2-3 mm. The small tooth guide groove (72) runs through all the small tooth rings (6). The width of the small tooth guide groove (72) is 1-2 mm. The length of the small tooth blocks (61) separated from the small tooth rings (6) is 1-2 mm.

6. The grinding disc for a grain moisture testing mill as described in claim 5, characterized in that: The length directions of the large tooth guide groove (71) and the small tooth guide groove (72) are respectively 3-5° with the radial direction passing through their center, and are biased towards the rotation direction of the moving grinding disc (2).

7. The grinding disc for a grain moisture testing mill as described in claim 6, characterized in that: Multiple guide grooves (8) are arranged in a ring array around the center of the outer side of the receiving cavity (3) of the stationary grinding disc (1) and the moving grinding disc (2) to the innermost large gear ring (5).

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