Lead screw angle adjusting mechanism of husked rice separator

Abstract

The utility model provides a husked rice separator lead screw angle adjusting mechanism which comprises a main machine frame, a bearing seat is installed in the center of the top end of the main machine frame through a pair of fixing corner connectors, a lead screw is vertically and rotatably installed in the center of the bearing seat, the bottom end of the lead screw is arranged in the main machine frame, and two sets of supporting beams are vertically and fixedly installed in the main machine frame. A movable cross beam is horizontally and slidably connected between the two groups of supporting beams; a nut is fixedly mounted at the top end of the movable cross beam and is in threaded connection with the screw rod; sliding seats are slidably connected to the two ends of one side of the movable cross beam, two sets of gears are installed at one ends of the sliding seats, and racks meshed with the gears are fixedly installed on one sides of the supporting beams; and a connecting rod mechanism for driving the sliding seat to move is mounted in the movable cross beam. According to the utility model, the single group of lead screws are combined with the gear and the rack for matched use, so that the smoothness and the accuracy of the movable cross beam during up-and-down movement adjustment can be effectively improved, and the structure strength and the adjustment convenience are higher.

Description

Technical Field

[0001] This utility model belongs to the technical field of rice and husk separators, and more specifically, it relates to a lead screw angle adjustment mechanism for a rice and husk separator. Background Technology

[0002] The dual-gravity paddy-brown rice separator is a key piece of equipment in grain processing for separating paddy rice from brown rice. Because the grain materials to be separated may have differences in moisture content or be of mixed varieties, the angle of the sieve plate needs to be adjusted to ensure effective separation.

[0003] Currently, the screen plate angle adjustment of paddy separators is typically achieved using a screw lifting mechanism. This mechanism converts the rotational motion of the screw into linear lifting movement to adjust the screen plate angle. Specifically, adjustment is achieved by installing a single or double screw lifting mechanism at one end of the screen plate. However, the single-set mechanism has lower structural strength, which is not conducive to long-term stable use. While the double-set mechanism has higher structural strength, ensuring consistent screw rotation during adjustment makes operation more difficult. Therefore, this paper researches and improves upon the existing structure and its shortcomings, providing a screw angle adjustment mechanism for paddy separators to achieve greater practical value. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a screw angle adjustment mechanism for a rice-grain separator, which is achieved by the following specific technical means:

[0005] A lead screw adjustment mechanism for a rice separator includes a main frame. A bearing seat is mounted at the top center of the main frame via a pair of fixed angle brackets. A lead screw is vertically and rotatably mounted at the center of the bearing seat. The bottom end of the lead screw is located inside the main frame. Two sets of support beams are vertically fixedly mounted inside the main frame, and a movable crossbeam is horizontally slidably connected between the two sets of support beams. A nut is fixedly mounted at the top of the movable crossbeam and threadedly connected to the lead screw. Sliding seats are slidably connected to both ends of one side of the movable crossbeam. Two sets of gears are mounted at one end of each sliding seat, and racks meshing with the gears are fixedly mounted on one side of each support beam. A linkage mechanism for driving the sliding seats to move is installed inside the movable crossbeam.

[0006] Furthermore, each of the support beams has a through groove on one side for the movable crossbeam to pass through and move. Both ends of the movable crossbeam pass through the through groove and are fixedly mounted with connecting arms. One end of each connecting arm is rotatably connected to a mounting base via a shaft. The mounting base is used to connect to the screen plate surface of the rice-grain separator.

[0007] Furthermore, a drive rod is fixedly inserted at the top of the lead screw, and the drive rod is arranged perpendicular to the lead screw; a bearing is fitted on the lead screw near the bottom of the drive rod, and the bearing is installed in a bearing housing.

[0008] Furthermore, the linkage mechanism includes a movable cylinder fitted on the outside of the lead screw, the movable cylinder being installed inside the movable crossbeam; support rods are hinged to both sides of the movable cylinder, and a connecting shaft is inserted into the other end of each support rod, one end of the connecting shaft being rotatably connected to the sliding seat; the movable crossbeam has waist-shaped grooves on both sides for the connecting shaft to pass through and move.

[0009] Furthermore, a wing nut is connected to the bottom end of the lead screw, and the top end of the wing nut is inserted into the interior of the moving crossbeam and contacts the bottom end of the moving cylinder.

[0010] Furthermore, a spring is fitted on the outside of the lead screw, and the upper and lower ends of the spring are respectively abutted against the nut and the movable cylinder.

[0011] Furthermore, an indicator arrow is fixedly installed on one side of the movable crossbeam, and a through groove is provided on one side of the main frame corresponding to the indicator arrow, with scales fixedly connected to both sides of the through groove.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This invention utilizes a single-set lead screw combined with a gear and rack to effectively improve the smoothness and precision of the moving crossbeam during vertical adjustment. It also boasts high structural strength and ease of adjustment, perfectly meeting practical application requirements. Simultaneously, the linkage mechanism drives the sliding seat to move the gear towards the rack for adjustment. When the gear presses against the rack, the backlash between the gear and rack is eliminated. By utilizing the gear's undercutting characteristic, the gear is secured to the rack, achieving locking and ensuring high stability during use. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model. Figure 1 .

[0015] Figure 2 This is a schematic diagram of the overall structure of this utility model. Figure 2 .

[0016] Figure 3 This is a partial structural diagram of the present invention. Figure 1 .

[0017] Figure 4 This is a partial structural diagram of the present invention. Figure 2 .

[0018] Figure 5 This is a cross-sectional schematic diagram of the present invention.

[0019] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0020] 1. Main frame; 2. Support beam; 3. Fixed angle bracket; 4. Bearing housing; 5. Lead screw; 6. Moving crossbeam; 7. Nut; 8. Wing nut; 9. Sliding seat; 10. Gear; 11. Rack; 12. Connecting arm; 13. Scale; 14. Indicating arrow; 15. Drive rod; 16. Mounting base; 17. Moving cylinder; 18. Support rod; 19. Spring. Detailed Implementation

[0021] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0022] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Example:

[0025] As attached Figure 1 To be continued Figure 5 As shown:

[0026] This utility model provides a lead screw adjustment mechanism for a rice-grain separator, including a main frame 1. A bearing seat 4 is mounted on the top center of the main frame 1 via a pair of fixed angle brackets 3. A lead screw 5 is vertically and rotatably mounted on the center of the bearing seat 4. The bottom end of the lead screw 5 is located inside the main frame 1. The main frame 1 is characterized by the following features: two sets of support beams 2 are vertically and fixedly mounted inside the main frame 1, and a movable crossbeam 6 is horizontally and slidably connected between the two sets of support beams 2; a nut 7 is fixedly mounted on the top of the movable crossbeam 6, and the nut 7 is threadedly connected to the lead screw 5; sliding seats 9 are slidably connected to both ends of one side of the movable crossbeam 6, and two sets of gears 10 are mounted on one end of each sliding seat 9; a rack 11 meshing with the gears 10 is fixedly mounted on one side of each support beam 2; and a linkage mechanism for driving the sliding seats 9 to move is installed inside the movable crossbeam 6.

[0027] One side of the support beam 2 is provided with a through groove for the movable crossbeam 6 to pass through and move. Both ends of the movable crossbeam 6 pass through the through groove and are fixedly installed with connecting arms 12. One end of each connecting arm 12 is rotatably connected to a mounting base 16 via a shaft. The mounting base 16 is used to connect to the screen plate of the rice-rice separator to achieve rapid up-and-down adjustment of the screen plate.

[0028] The lead screw 5 has a drive rod 15 fixedly inserted at its top end, and the drive rod 15 is arranged perpendicular to the lead screw 5; a bearing is fitted on the bottom side of the lead screw 5 near the drive rod 15, and the bearing is installed in the bearing seat 4.

[0029] The linkage mechanism includes a movable cylinder 17 fitted around the outside of the lead screw 5, which is installed inside the movable crossbeam 6. Support rods 18 are hinged to both sides of the movable cylinder 17, and connecting shafts are inserted into the other ends of the support rods 18. One end of each connecting shaft is rotatably connected to a sliding seat 9. The movable crossbeam 6 has waist-shaped grooves on both sides for the connecting shafts to pass through and move, so that when the movable cylinder 17 moves up and down, the sliding seat can be quickly driven by the support rods 18 and the connecting shafts. 9 moves, thereby causing gear 10 and rack 11 to clamp and loosen; when gear 10 and rack 11 are fully clamped, the meshing backlash is eliminated and they enter an over-constrained meshing state. In this state, a large friction force and self-locking effect are generated between the tooth surfaces, which firmly fixes gear 10 to rack 11, achieving mechanical locking; when gear 10 and rack 11 are loosened and return to the normal meshing state (maintaining appropriate backlash or standard meshing), gear 10 can achieve smooth meshing transmission along rack 11.

[0030] The bottom end of the lead screw 5 is connected to a wing nut 8. The top end of the wing nut 8 is inserted into the interior of the moving crossbeam 6 and contacts the bottom end of the moving cylinder 17, so that when the wing nut 8 rotates, it drives the moving cylinder 17 to move and adjust quickly.

[0031] Among them, a spring 19 is fitted on the outer side of the lead screw 5, and the upper and lower ends of the spring 19 are respectively abutted against the nut 7 and the movable cylinder 17 to ensure that the movable cylinder 17 can be tightly attached to the wing nut 8 or the inner bottom side of the movable cylinder 17.

[0032] One side of the movable crossbeam 6 is fixedly equipped with an indicator arrow 14, and one side of the main frame 1 is provided with a through groove corresponding to the indicator arrow 14. Both sides of the through groove are fixedly connected with scales 13 to facilitate feedback of adjustment values ​​and achieve precise adjustment.

[0033] The working principle of this embodiment is as follows: During adjustment, firstly, the wing nut 8 is turned so that it moves down a certain distance along the screw 5. At this time, the moving cylinder 17 moves down along the screw 5 under the action of the spring 19. When moving down, the sliding seat 9 is pulled by the support rod 18, so that the gear 10 and the rack 11 return to the normal meshing state. Then, the screw 5 can be rotated by the drive rod 15, and the moving crossbeam 6 and its connected connecting arm 12 can be moved up and down under the action of the nut 7 to complete the up and down adjustment of the screen plate surface and change its angle. After adjustment, twist the wing nut 8 in the opposite direction so that its top presses against the moving cylinder 17, causing it to move upward along the lead screw 5. Under the action of the support rod 18, the sliding seat 9 is driven to move towards the position of the rack 11, which drives the gear 10 to press against the rack 11. When the gear 10 and the rack 11 are fully pressed together, the meshing backlash between the two is eliminated, and they enter an over-constrained meshing state. In this state, a great friction force and self-locking effect are generated between the tooth surfaces, which firmly fixes the gear 10 to the rack 11, achieving mechanical locking.

[0034] Finally, it should be noted that the lead screw 5 used in this application is a trapezoidal lead screw, which has a self-locking characteristic after rotation adjustment.

[0035] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A screw adjustment mechanism for a grain separator, comprising a main frame (1), wherein a bearing seat (4) is mounted at the top center of the main frame (1) via a pair of fixed angle brackets (3), and a screw (5) is vertically rotatably mounted at the center of the bearing seat (4), wherein the bottom end of the screw (5) is disposed inside the main frame (1), characterized in that: The main frame (1) has two sets of support beams (2) vertically fixedly installed inside, and a moving crossbeam (6) is horizontally slidably connected between the two sets of support beams (2); a nut (7) is fixedly installed at the top of the moving crossbeam (6), and the nut (7) is threadedly connected to the lead screw (5); both ends of one side of the moving crossbeam (6) are slidably connected to sliding seats (9), and two sets of gears (10) are installed at one end of each sliding seat (9), and a rack (11) that meshes with the gears (10) is fixedly installed on one side of each support beam (2); a linkage mechanism for driving the sliding seats (9) to move is installed inside the moving crossbeam (6).

2. The lead screw angle adjustment mechanism for the rice-straw separator as described in claim 1, characterized in that: One side of each support beam (2) is provided with a through groove for the movable crossbeam (6) to pass through and move. Both ends of the movable crossbeam (6) pass through the through groove and are fixedly installed with connecting arms (12). One end of each connecting arm (12) is rotatably connected to a mounting base (16) via a shaft. The mounting base (16) is used to connect to the sieve plate surface of the rice-straw separator.

3. The lead screw angle adjustment mechanism for the rice-straw separator as described in claim 1, characterized in that: A drive rod (15) is fixedly inserted at the top of the lead screw (5), and the drive rod (15) is arranged perpendicular to the lead screw (5); a bearing is fitted on the bottom side of the lead screw (5) near the drive rod (15), and the bearing is installed in the bearing seat (4).

4. The lead screw angle adjustment mechanism for the rice-straw separator as described in claim 1, characterized in that: The linkage mechanism includes a movable cylinder (17) fitted on the outside of the lead screw (5), the movable cylinder (17) being installed inside the movable crossbeam (6); both sides of the movable cylinder (17) are hinged with support rods (18), the other end of each support rod (18) is inserted with a connecting shaft, one end of each connecting shaft being rotatably connected to a sliding seat (9); both sides of the movable crossbeam (6) are provided with waist-shaped grooves for the connecting shaft to pass through and move.

5. The lead screw angle adjustment mechanism for the rice-straw separator as described in claim 4, characterized in that: The bottom end of the lead screw (5) is connected to a wing nut (8), the top end of which is inserted into the interior of the moving crossbeam (6) and contacts the bottom end of the moving cylinder (17).

6. The lead screw angle adjustment mechanism for the rice-straw separator as described in claim 4, characterized in that: A spring (19) is fitted on the outside of the lead screw (5), and the upper and lower ends of the spring (19) are respectively abutted against the nut (7) and the movable cylinder (17).

7. The lead screw angle adjustment mechanism for the rice-straw separator as described in claim 1, characterized in that: An indicator arrow (14) is fixedly installed on one side of the movable crossbeam (6), and a through groove is provided on one side of the main frame (1) corresponding to the indicator arrow (14), and a scale (13) is fixedly connected to both sides of the through groove.

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