Longitudinal angle adjusting mechanism of a specific gravity cleaner screen bed

Abstract

The utility model discloses a kind of longitudinal inclination angle adjusting mechanism of specific gravity cleaning machine screen bed, including bottom frame, first lifting support, second lifting support, third lifting support, hydraulic oil cylinder and support frame. The first lifting support is connected with bottom frame by first elastic connecting plate;Second lifting support is connected with bottom frame by second elastic connecting plate, and is connected with first lifting support by third elastic connecting plate;Third lifting support is connected with first lifting support by fourth elastic connecting plate, and is connected with second lifting support by fifth elastic connecting plate;Hydraulic oil cylinder is connected between bottom frame and third lifting support;Support frame is connected with third lifting support by sixth elastic connecting plate, and is connected with bottom frame by seventh elastic connecting plate.The utility model has the advantages of adjusting labor-saving, convenient operation, stable operation, high reliability, especially suitable for large-tonnage specific gravity cleaning machine.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery technology, specifically to a longitudinal tilt angle adjustment mechanism for a gravity separator screen bed. Background Technology

[0002] Gravity separators are key equipment in agriculture, seed processing, and grain handling industries. They utilize the difference in material specific gravity and air resistance, through a vibrating screen bed and airflow, to clean, grade, and remove impurities from materials such as seeds and grains. The screen bed, as its core working component, directly affects the material flow rate, distribution uniformity, and final sorting effect through its longitudinal inclination angle. Therefore, quickly and accurately adjusting the screen bed inclination angle according to different material characteristics (such as type, moisture content, and impurity content) is crucial for ensuring cleaning quality and efficiency.

[0003] Currently, the screen bed tilt angle adjustment methods used in existing gravity separators, especially medium and large-sized equipment, mainly fall into the following categories: Firstly, mechanical adjustment. Common methods involve using bolts, set screws, gear racks, or handwheels / worm gears. During adjustment, operators must manually tighten and loosen multiple fixing bolts, laboriously prying one end of the heavy screen bed with pry bars, and then re-tightening. This method is not only extremely cumbersome, labor-intensive, and time-consuming, but also has low adjustment accuracy, poses significant safety hazards, and is unsuitable for modern continuous production. Secondly, simple hydraulic adjustment. Some equipment uses hydraulic cylinders to directly lift one side of the screen bed. While this reduces manpower, this single-point lifting structure is prone to uneven stress when bearing the enormous weight and strong vibrations of the screen bed, leading to problems such as damaged cylinder seals, poor hydraulic system stability, and insufficient reliability. Even after long-term use, screen bed misalignment and jamming may occur, failing to meet the requirements of high-tonnage, high-intensity operations.

[0004] In summary, existing screen bed tilt adjustment mechanisms either rely on inefficient manual operation or suffer from instability and reliability issues. This has become a technical bottleneck restricting the improvement of automation and performance optimization in gravity separation equipment. Therefore, there is an urgent need for a new type of adjustment mechanism that can achieve labor-saving, fast, stable, and reliable tilt adjustment to adapt to the development trend of modern intelligent agricultural machinery manufacturing. Utility Model Content

[0005] The purpose of this invention is to provide a longitudinal tilt angle adjustment mechanism for a gravity separator screen bed that is structurally sound, easy to adjust, and has good stability, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a longitudinal tilt angle adjustment mechanism for a gravity separator screen bed, comprising a base frame, on which a first lifting bracket is provided, the first lifting bracket being fixedly connected to the base frame via a first elastic connecting plate; a second lifting bracket is also provided on the base frame, the second lifting bracket being fixedly connected to the base frame via a second elastic connecting plate and to the first lifting bracket via a third elastic connecting plate; a third lifting bracket is also connected to the first lifting bracket, the third lifting bracket being fixedly connected to the first lifting bracket via a fourth elastic connecting plate and to the second lifting bracket via a fifth elastic connecting plate; a hydraulic cylinder is provided between the third lifting bracket and the base frame, the two ends of the hydraulic cylinder being hinged to the base frame and the third lifting bracket respectively; a support frame is also provided on the third lifting bracket, the support frame being fixedly connected to the third lifting bracket via a sixth elastic connecting plate and to the base frame via a seventh elastic connecting plate.

[0007] Preferably, the hydraulic cylinder can be replaced by an electric cylinder.

[0008] Preferably, the first to seventh elastic connecting plates are metal elastic plates or epoxy phenolic resin elastic plates.

[0009] Preferably, the support frame is used to mount the screen bed of the gravity separator.

[0010] The working process of this utility model is as follows: In the initial state, the hydraulic cylinder is in the retracted state, the entire lifting support assembly is in a low position, and the support frame is in a horizontal or slightly inclined state.

[0011] When it is necessary to increase the tilt angle of the screen bed, the control system extends the piston rod of the hydraulic cylinder. The thrust of the cylinder pushes the third lifting bracket upward. The upward movement of the third lifting bracket, through the fourth and fifth elastic connecting plates, causes the right end of the first lifting bracket and the left end of the second lifting bracket to move upward simultaneously. This action forces the first parallelogram structure, composed of the base frame, the first lifting bracket, the second lifting bracket, and the first, second, and third elastic connecting plates, to deform, causing each elastic connecting plate to bend elastically.

[0012] During the final movement, the upward movement of the third lifting bracket simultaneously pushes the left end of the support frame upward through the sixth elastic connecting plate. Since the right end of the support frame is hinged to the bottom frame via the seventh elastic connecting plate, the support frame rotates around its right hinge point, increasing the overall tilt angle. The screen bed mounted on it then reaches the required larger working tilt angle.

[0013] When a reduction in tilt angle is needed, the hydraulic cylinder retracts its piston rod. With the aid of the restoring elasticity of the connecting plates, the entire mechanism smoothly resets following the reverse process described above, thus reducing the tilt angle.

[0014] Throughout the adjustment process, the restoring force generated by the elastic deformation of all the elastic connecting plates not only serves as a transmission and hinge function, but also effectively suppresses the shaking of the mechanism, absorbs the impact load during operation, and greatly enhances the rigidity and stability of the entire adjustment system.

[0015] The beneficial effects of this utility model are as follows: (1) This utility model adopts a hydraulic or electric drive method to replace the traditional manual operation, which significantly improves the convenience and efficiency of equipment operation. By controlling the extension and retraction of the drive device, the tilt angle of the screen bed can be changed quickly and accurately, saving time and effort and greatly reducing the labor intensity of operators. At the same time, this drive method is easy to integrate into an automated control system, laying the foundation for the intelligent adjustment of the cleaning process.

[0016] (2) The linkage design of multiple sets of elastic connecting plates and lifting brackets in this utility model effectively enhances the stability and reliability of the system during operation. The restoring force generated by the elastic connecting plates during deformation not only transmits motion, but also absorbs the impact of the screen bed vibration, suppresses shaking, ensures the stability of large-tonnage equipment during adjustment and operation, and extends the service life of the equipment.

[0017] (3) The present invention has a reasonable structural design and a high degree of modularity. It is not only easy to maintain, but also has good load adaptability and functional expandability. Its stable support and flexible adjustment capability can meet the diverse requirements of different material cleaning processes for inclination angle, thereby improving the overall operating performance and application range of the gravity separator. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a side view of the structure of this utility model; Figure 3 This is a three-dimensional axonometric view of the present invention; In the diagram: 1-base frame; 2-first lifting bracket; 3-first elastic connecting plate; 4-second lifting bracket; 5-second elastic connecting plate; 6-third elastic connecting plate; 7-third lifting bracket; 8-hydraulic cylinder; 9-fourth elastic connecting plate; 10-fifth elastic connecting plate; 11-support frame; 12-sixth elastic connecting plate; 13-seventh elastic connecting plate. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings.

[0020] I. Structural Composition and Connection Relationships like Figure 1 and Figure 2As shown in the figure, the longitudinal tilt angle adjustment mechanism of the sieve bed of the gravity cleaning machine provided in this embodiment mainly includes a base frame, a lifting support group, an elastic connecting plate group, a driving device and a support frame.

[0021] 1. Basic frame and primary lifting mechanism: The base frame 1, welded from structural steel, forms the foundation platform for the entire mechanism, used for fixing to the foundation or the main frame of the cleaning machine. The first lifting bracket 2 and the second lifting bracket 4 are arranged parallel to each other on the base frame 1. The first lifting bracket 2 is hinged to the left side of the base frame 1 via a first elastic connecting plate 3 at its left end. The second lifting bracket 4 is hinged to the right side of the base frame 1 via a second elastic connecting plate 5 at its right end. The right end of the first lifting bracket 2 and the left end of the second lifting bracket 4 are hinged together via a third elastic connecting plate 6, thus forming a deformable parallelogram frame structure.

[0022] 2. Secondary lifting and drive mechanism: Above the first lifting bracket 2 and the second lifting bracket 4, a third lifting bracket 7 is provided. The left end of the third lifting bracket 7 is hinged to the middle of the first lifting bracket 2 via a fourth elastic connecting plate 9, and its right end is hinged to the middle of the second lifting bracket 4 via a fifth elastic connecting plate 10. The driving device uses a double-acting hydraulic cylinder 8. The bottom of the cylinder body of the hydraulic cylinder 8 is hinged to the lug in the middle of the base frame 1 via a pin, and the top of its piston rod is hinged to the lug in the middle of the third lifting bracket 7 via a pin. The hydraulic cylinder 8 can be powered by the hydraulic station of the cleaning machine and operated by an external reversing valve and control switch.

[0023] 3. Screening bed installation and final support: The support frame 11 is located at the top of the entire mechanism and is used to directly install and support the screen bed of the gravity separator (not shown in the diagram). The left end of the support frame 11 is hinged to the left side of the third lifting bracket 7 via the sixth elastic connecting plate 12, and its right end is hinged to the right side of the bottom frame 1 via the seventh elastic connecting plate 13, thereby forming a second deformable, cooperative parallelogram structure.

[0024] II. Working Principle and Process In the initial state, the hydraulic cylinder 8 is in the retracted state, the entire lifting support assembly is in a low position, and the support frame 11 is in a horizontal or slightly inclined state.

[0025] When it is necessary to increase the tilt angle of the screen bed, the piston rod of the hydraulic cylinder 8 is extended through the control system. The thrust of the cylinder pushes the third lifting bracket 7 to move upward. The upward movement of the third lifting bracket 7 causes the right end of the first lifting bracket 2 and the left end of the second lifting bracket 4 to move upward synchronously through the fourth elastic connecting plate 9 and the fifth elastic connecting plate 10. This action forces the first parallelogram structure composed of the base frame 1, the first lifting bracket 2, the second lifting bracket 4, the first elastic connecting plate 3, the second elastic connecting plate 5, and the third elastic connecting plate 6 to deform, and each elastic connecting plate undergoes elastic bending.

[0026] During the final action, the upward movement of the third lifting bracket 7 simultaneously pushes the left end of the support frame 11 upward through the sixth elastic connecting plate 12. Since the right end of the support frame 11 is hinged to the bottom frame 1 through the seventh elastic connecting plate 13, the support frame 11 rotates around its right hinge point, and the overall tilt angle increases accordingly. The screen bed installed on it also reaches the required larger working tilt angle.

[0027] When it is necessary to reduce the tilt angle, the hydraulic cylinder 8 is operated to retract the piston rod. With the assistance of the restoring elastic force of each elastic connecting plate, the entire mechanism smoothly resets according to the reverse process described above, and the tilt angle decreases.

[0028] Throughout the adjustment process, the restoring force generated by the elastic deformation of all the elastic connecting plates not only serves as a transmission and hinge function, but also effectively suppresses the shaking of the mechanism, absorbs the impact load during operation, and greatly enhances the rigidity and stability of the entire adjustment system.

[0029] The elastic connecting plate is preferably made of spring steel or alloy steel with similar properties. Its thickness, width and length are calculated and selected according to the required elastic force and equipment tonnage to ensure that it has good fatigue life and sufficient elastic reserve.

[0030] As an equivalent replacement for hydraulic cylinder 8, a servo electric cylinder can be used. The housing of the electric cylinder is hinged to the base frame 1, and the end of its push rod is hinged to the third lifting bracket 7. Using an electric cylinder facilitates integration with a PLC control system, enabling digital setting, memorization, and automatic precise control of the tilt angle.

[0031] Installation and Debugging: During installation, ensure that the pins at each hinge point rotate freely without jamming. During the initial debugging, extend and retract the hydraulic cylinder 8 throughout its full range under no-load conditions to observe whether the mechanism moves smoothly and whether there is any interference between the components. After confirming that everything is correct, install the screen bed and conduct an inclination angle adjustment test under load.

[0032] This embodiment, through the specific structure described above, demonstrates the following advantages of this utility model: 1) Hydraulic or electric drive, simple operation, easy to handle the adjustment of large-tonnage screen beds.

[0033] 2) The parallel mechanism composed of multiple sets of elastic connecting plates can maintain stability when subjected to uneven loads, effectively avoiding the jamming or wear problems that may exist in pure rigid mechanisms, and has a long service life.

[0034] 3) Easy to automate: The mechanism is easy to integrate with existing cleaning machine control systems, providing a hardware foundation for achieving fully automated cleaning operations.

[0035] In summary, the embodiments of this utility model provide a screen bed tilt angle adjustment mechanism that is ingeniously structured, reliable in operation, and easy to adjust, and is particularly suitable for large and medium-sized gravity separators.

[0036] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, based on the technical teachings provided by this utility model and as common knowledge in the mechanical field, other equivalent modifications and improvements can be made, and these should also be considered within the scope of protection of this utility model.

Claims

1. A longitudinal tilt angle adjustment mechanism for a gravity separator screen bed, characterized in that: The system includes a base frame (1), on which a first lifting bracket (2) is provided. The first lifting bracket (2) is fixedly connected to the base frame (1) via a first elastic connecting plate (3). A second lifting bracket (4) is also provided on the base frame (1). The second lifting bracket (4) is fixedly connected to the base frame (1) via a second elastic connecting plate (5) and to the first lifting bracket (2) via a third elastic connecting plate (6). A third lifting bracket (7) is also connected to the first lifting bracket (2). The third lifting bracket (7) is connected to the first lifting bracket (2) via a fourth elastic connecting plate (9). The lifting bracket (2) is fixedly connected and is fixedly connected to the second lifting bracket (4) through the fifth elastic connecting plate (10); a hydraulic cylinder (8) is provided between the third lifting bracket (7) and the bottom frame (1), and the two ends of the hydraulic cylinder (8) are respectively hinged to the bottom frame (1) and the third lifting bracket (7); a support frame (11) is also provided on the third lifting bracket (7), and the support frame (11) is fixedly connected to the third lifting bracket (7) through the sixth elastic connecting plate (12) and fixedly connected to the bottom frame (1) through the seventh elastic connecting plate (13).

2. The longitudinal tilt angle adjustment mechanism for a gravity separator screen bed according to claim 1, characterized in that: The hydraulic cylinder (8) can be replaced by an electric cylinder.

3. The longitudinal tilt angle adjustment mechanism for a gravity separator screen bed according to claim 1 or 2, characterized in that: The first elastic connecting plate (3) to the seventh elastic connecting plate (13) are metal elastic plates or epoxy phenolic resin elastic plates.

4. The longitudinal tilt angle adjustment mechanism for a gravity separator screen bed according to claim 3, characterized in that: The support frame (11) is used to install the screen bed of the gravity separator.

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