Grain screening machine

Abstract

The utility model relates to a grain screening machine, and relates to the technical field of agricultural mechanical equipment, the grain screening machine is characterized in that a rack (2) is made of a firm metal material, a structure for placing a hopper (1) is arranged in the middle of the rack (2), one side of a feeding port at the top of the rack (2) is high, and one side of a discharging port at the top of the rack (2) is low; the hopper (1) is made of a stainless steel material, is provided with a discharge port (10) at the bottom, and is placed in the middle of the rack (2); the U-shaped bearing seats (5) are located at the two ends of the middle position of the top of the rack (2), and bearings (6) are arranged in the U-shaped bearing seats (5); the central shaft (4) is arranged on the inner side of the bearing (6); the fixing ring (7) is arranged on the central shaft (4); the screen (9) is laid on the fixing ring (7), and the pressing strip (8) fixes the screen (9) on the fixing ring (7) through bolts. And the belt pulley (3) is arranged on the central shaft (4) on one side of the discharge port and is connected with a power source through a belt.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery and equipment technology, and in particular to a grain screening machine. Background Technology

[0002] In agricultural production, grain screening is a crucial step in ensuring grain quality and subsequent processing and storage. Traditional grain screening methods have many limitations. In the early days, manual screening was mostly used. This method not only consumed a lot of manpower and time, resulting in extremely low efficiency, but also the accuracy of screening largely depended on the experience and concentration of the workers, making it difficult to guarantee the consistency and stability of the screening results.

[0003] With the development of agricultural mechanization, some simple mechanical screening equipment has emerged, but most of them have unreasonable structural designs. For example, the screen fixing method of some screening machines is unreliable. Under long-term vibration and friction, the screen is prone to loosening, deformation, or even breakage, leading to a decrease in screening efficiency. Frequent screen replacement also increases operating costs and maintenance workload. Some equipment also has unstable power transmission systems, with belts prone to slippage and misalignment, affecting the normal operation and screening efficiency. Furthermore, traditional screening machines lack flexibility in processing different types and sizes of grains, making it difficult to meet diverse screening needs. In addition, insufficient overall structural stability results in significant vibration and noise during operation, impacting the working environment and potentially causing premature damage to equipment components. Summary of the Invention

[0004] A grain screening machine, comprising:

[0005] The frame (2) is made of sturdy metal material and has a structure in the middle for placing the hopper (1). The top of the frame (2) has a high inlet side and a low outlet side.

[0006] The hopper (1) is made of stainless steel and has a discharge port (10) at the bottom, which is placed in the middle of the frame (2);

[0007] The U-shaped bearing seats (5) are located at both ends of the top middle position of the frame (2), and the bearings (6) are provided inside the U-shaped bearing seats (5);

[0008] A central shaft (4) is installed inside the bearing (6);

[0009] A retaining ring (7) is provided on the central shaft (4);

[0010] A screen (9) laid on the fixed ring (7), and a pressure strip (8) that fixes the screen (9) on the fixed ring (7) by bolts;

[0011] A pulley (3) is installed on the central shaft (4) on one side of the discharge port. The pulley (3) is connected to the power source via a belt.

[0012] The frame (2) is made of Q235 steel and is made into a specific shape by welding process to provide stable support and withstand the weight and vibration of the equipment during operation.

[0013] The diameter of the discharge port (10) at the bottom of the hopper (1) is 10-25 cm, which can be adjusted according to actual screening needs to control the discharge speed of the grain.

[0014] The U-shaped bearing seat (5) is made of cast iron, which has good compressive strength and shock absorption; the central shaft (4) is made of No. 45 steel and is heat-treated to improve its strength and toughness.

[0015] The screen (9) is made of stainless steel. The appropriate aperture is selected according to the type and size of the grain being screened. When screening wheat, the aperture is 1.5-2.5 mm, and when screening soybeans, the aperture is 15-20 mm.

[0016] The fixed ring (7) and the central shaft (4) are connected by a key or an interference fit to ensure that they rotate synchronously; the pulley (3) and the central shaft (4) are connected by a key or an expansion sleeve to realize the rotation of the central shaft (4). Beneficial effects

[0017] The use of this invention makes grain screening more time-saving and labor-saving. Traditional grain screening requires three people to work together: two people to shake the sieve and one person to add the grain to be screened into the sieve. It takes three people working together to complete the screening work. With this invention, only one person needs to watch the machine to complete the screening work.

[0018] Stable structure: The frame, made of Q235 steel through welding, provides solid and reliable support for the entire screening machine, effectively bearing the weight and vibration during operation, ensuring the stability of the equipment during long-term operation, reducing loosening and damage of parts caused by vibration, and extending the service life of the equipment.

[0019] High screening accuracy: Stainless steel screens with appropriate apertures can be selected according to different grain types and particle sizes. The screens are firmly fixed to the fixed rings by pressure bars and bolts, ensuring that the screens will not loosen or deform during rotation, thus ensuring screening accuracy. This allows for precise separation of impurities and non-compliant particles from the grains, improving the purity and quality of the grains.

[0020] Smooth operation: The cast iron U-shaped bearing housing has good pressure resistance and shock absorption. The high-precision bearing installed inside, together with the tempered 45 steel central shaft, enables the central shaft to rotate smoothly, reducing noise and vibration during equipment operation and improving the reliability and stability of equipment operation.

[0021] Reliable power transmission: The pulley is connected to the central shaft by a key or a shrink sleeve, and is connected to the power source by a belt. This design ensures the stability and reliability of power transmission, reduces problems such as belt slippage and deviation, and ensures that the equipment can operate continuously and efficiently.

[0022] High adaptability: The overall structural design and selection of components enable this grain screening machine to adapt to the screening of various grains. By changing the screen with different aperture sizes, it can meet the needs of screening different grains such as wheat and soybeans, and has strong versatility and flexibility. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is the front view of the present invention;

[0026] Figure 3 This is a side view of the present invention;

[0027] Figure 4 This is a bottom view of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of the present invention from a bottom view;

[0029] Figure 6 This is the front view of Example 2;

[0030] Figure 7 This is a side view of Example 2;

[0031] In the diagram: 1. Hopper; 2. Frame; 3. Pulley; 4. Central shaft; 5. U-shaped bearing seat; 6. Bearing; 7. Retaining ring; 8. Pressure bar; 9. Screen; 10. Discharge port; 11. Discharge chute; 12. Conveyor belt. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] The explanation of the custom names in this invention is as follows:

[0034] Example 1: A grain screening machine, a hopper (1) is provided in the middle of the frame (2), and a discharge port (10) is provided at the bottom of the hopper (1). The hopper (1) is placed on the middle of the frame (2). The top of the frame (2) is higher on the side with the inlet and lower on the side with the outlet. U-shaped bearing seats (5) are provided at both ends of the middle position of the top of the frame (2). A bearing (6) is provided inside the U-shaped bearing seat (5). A central shaft (4) is provided inside the bearing (6). A fixing ring (7) is provided on the central shaft (4). A screen (9) is provided on the fixing ring (7). A pressure strip (8) fixes the screen (9) on the fixing ring (7). The pressure strip (8) is fixed on the fixing ring (7) by bolts. A pulley (3) is provided on the central shaft (4) on the side with the outlet.

[0035] Example 2: A grain screening machine, the structure of which is as in Example 1. The front end of the grain screening machine is provided with a conveyor belt (12) and the rear end is provided with a discharge chute (11). The bottom of the conveyor belt (12) is provided with a support, and a conveyor is provided on the support. A motor is provided at the end of the conveyor that is close to the ground. The motor drives the conveyor to rotate. The discharge chute (11) is inclined and has a support frame at its bottom. The screen (9) is divided into two parts, A and B. The screen aperture of part A is smaller than that of part B. Part A is used to screen the soil in the grain. The grain passes through the screen of part B and falls into the lower hopper (1). Finally, the straw in the grain is discharged from the discharge chute (11).

[0036] I. Material Preparation

[0037] Frame (2): Made of sturdy metal material, such as Q235 steel, and welded to a specific shape to ensure structural stability and withstand the weight and vibration of the entire screening machine during operation.

[0038] Hopper (1): Made of stainless steel, it has good wear resistance and collects grains. The size of the discharge port (10) at the bottom of the hopper is designed according to the actual screening requirements. Generally, the diameter is about 10-25 cm to control the discharge speed of the grains.

[0039] U-shaped bearing housing (5): Made of cast iron, which has good compressive strength and shock absorption. A high-precision bearing (6) is installed inside the U-shaped bearing housing to ensure that the central shaft (4) can rotate smoothly.

[0040] The central shaft (4) is made of 45 steel and has undergone heat treatment to improve its strength and toughness. The length of the central shaft is customized according to the width of the frame, and both ends are installed in bearings in U-shaped bearing seats.

[0041] Fixed ring (7): Made of metal sheet, it is fixed to the central shaft (4) by welding or bolting to ensure that it rotates synchronously with the central shaft.

[0042] Screen (9): Select a stainless steel screen with an appropriate aperture according to the type and size of the grain being screened. For example, when screening wheat, a screen with an aperture of 1.5-2.5 mm can be used; when screening soybeans, a screen with an aperture of 15-20 mm can be used.

[0043] Pressure bar (8): Made of metal, the screen (9) is tightly fixed to the fixing ring (7) by bolts to prevent the screen from loosening during rotation.

[0044] Pulley (3): Made of cast iron, it is installed on the central shaft (4) on one side of the discharge port and connected to the power source (such as a motor) via a belt to realize the rotation of the central shaft.

[0045] II. Installation Steps

[0046] Place the finished frame (2) on a flat ground to ensure it is level and stable.

[0047] Place the hopper (1) on the middle part of the frame (2) so that the outlet (10) of the hopper is aligned with the discharge direction of the frame. Secure the hopper to the frame with bolts or by welding to ensure that it does not shake during operation.

[0048] On the top inlet side and the outlet side of the frame (2), install U-shaped bearing seats (5) at the positions required by the design. Use a level to calibrate the U-shaped bearing seats to ensure that their horizontality and verticality meet the requirements. Then, install the bearing (6) inside the U-shaped bearing seats.

[0049] Insert both ends of the central shaft (4) into the bearings (6) inside the U-shaped bearing housing, so that the central shaft can rotate freely within the bearings. Install a retaining ring (7) on the central shaft (4) according to the size and position of the screen. The retaining ring and the central shaft can be connected by a key or an interference fit to ensure that the retaining ring and the central shaft rotate synchronously.

[0050] Lay the screen (9) on the fixing ring (7) and use the pressure strip (8) to firmly fix the screen to the fixing ring. The pressure strip and the fixing ring are connected by bolts. When tightening the bolts, ensure that the screen is under uniform force and that there is no local loosening or deformation.

[0051] Install a pulley (3) on the central shaft (4) on one side of the discharge port. The pulley and the central shaft are connected by a key or a tension sleeve to ensure that the pulley and the central shaft rotate synchronously. Then, install the belt between the pulley and the pulley of the power source, and adjust the belt tension to enable it to transmit power normally.

[0052] III. Debugging and Operation

[0053] After installation, conduct a comprehensive inspection of the grain screening machine to ensure that all components are securely installed and reliably connected. Check if the screen is flat and free of damage or holes; check if the belt tension is appropriate and if there is any looseness or misalignment.

[0054] Connect the power source and start the motor to make the central shaft drive the screen to rotate. Observe the rotation of the screen and check for any abnormal noise or vibration. If any abnormality is found, stop the machine immediately for inspection and adjustment.

[0055] The grains to be screened are poured into the hopper (1), and fall onto the rotating screen through the discharge port (10). During the rotation of the screen, grain particles that meet the screen aperture size fall through the screen, completing the screening process. Grain particles that do not meet the screen aperture size remain on the screen and are conveyed to the discharge port for discharge.

[0056] Based on the screening results, adjust parameters such as the screen rotation speed and the hopper discharge speed. For example, if the screened grains contain many impurities, the screen rotation speed can be increased appropriately; if the grain discharge speed is too fast or too slow, the size of the hopper discharge opening can be adjusted.

[0057] During operation, the grain screening machine should be maintained and serviced regularly. Inspect the wear of each component and replace severely worn parts promptly; lubricate bearings, pulleys, and other parts to ensure the equipment operates normally.

Claims

1. A grain sorting machine characterized by, The utility model relates to a grain screening device, which comprises the following components: a rack (2) made of a solid metal material, which has a structure for placing a hopper (1) in the middle part, and the top of the rack (2) is higher on the side of the feeding port and lower on the side of the discharging port; the hopper (1) made of a stainless steel material, which has a discharging port (10) at the bottom and is placed in the middle part of the rack (2); a U-shaped bearing seat (5) located at the two ends of the middle part of the top of the rack (2), which has a bearing (6) inside; a central shaft (4) installed on the inside of the bearing (6); a fixing ring (7) arranged on the central shaft (4); a screen (9) laid on the fixing ring (7) and a pressing strip (8) for fixing the screen (9) on the fixing ring (7) through a bolt; a belt pulley (3) installed on the central shaft (4) on the side of the discharging port, which is connected to a power source through a belt.

2. The grain sorting machine of claim 1, wherein, The rack (2) is made of Q235 steel and has a specific shape formed through a welding process to provide stable support and bear the weight and vibration during the operation of the device.

3. The grain sorting machine of claim 1, wherein, The diameter of the discharging port (10) at the bottom of the hopper (1) is 10-25 cm, which can be adjusted according to the actual screening requirements to control the discharging speed of the grains.

4. The grain cleaner of claim 1, wherein The U-shaped bearing seat (5) is made of cast iron, which has good pressure resistance and shock resistance; the central shaft (4) is made of 45 steel and is subjected to a quenching and tempering treatment to improve its strength and toughness.

5. The grain cleaner of claim 1, wherein The screen (9) is made of a stainless steel material, and the appropriate aperture is selected according to the type and particle size of the screened grains; when screening wheat, the aperture is 1.5-2.5 mm, and when screening soybeans, the aperture is 15-20 mm.

6. The grain cleaner of claim 1, wherein The fixing ring (7) and the central shaft (4) are connected through a key connection or interference fit to ensure synchronous rotation; the belt pulley (3) and the central shaft (4) are connected through a key connection or expansion sleeve connection to realize the rotation of the central shaft (4).

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