Screen frame tightening mechanism of plane rotary screen

Abstract

The utility model discloses a screen frame tightening mechanism of a plane rotary screen, which is characterized in that screen ship frames are arranged on two sides of a screen ship, support steps are arranged on the lower parts of the inner walls of the screen ship frames, and a tightening mechanism is arranged below the long edge of a screen frame of an upper-layer screen; the rear end of a screw shaft of the tight supporting mechanism is a threaded section and is screwed in a fixing nut, the front end of the screw shaft is an optical shaft and penetrates through axial holes of at least two driving bodies, and limiting blocks are arranged on the front side and the rear side of each driving body respectively; a driving body transverse shaft is arranged on the side, facing the screen ship frame, of each driving body, an upper supporting arm and a lower supporting arm are hinged to each driving body transverse shaft, an upper pressing frame is hinged to the upper end of each upper supporting arm, and the upper pressing frames abut against the lower portion of the long edge of the screen frame of the upper-layer screen; the lower end of the lower supporting arm is hinged to a lower pressing frame, and the lower portion of the lower pressing frame is supported on the long edge of the screen frame of the lower-layer screen or supported on the supporting step. According to the mechanism, the screen shoe can be rapidly supported tightly, meanwhile, the screen shoe can be rapidly separated from the supported tightly state, the efficiency of assembling and disassembling the screen body is greatly improved, and the requirement for space is low.

Description

Technical Field

[0001] This utility model relates to a connection mechanism between multiple screens in a planar rotary screen, and more particularly to a screen frame clamping mechanism for a planar rotary screen, belonging to the technical field of screening equipment. Background Technology

[0002] Planar rotary screens are widely used in the grain, food, and feed industries for screening and grading raw materials and finished products, especially for screening and grading granular materials. A planar rotary screen consists of a base, a boat base, a screen boat, a suspension device, a drive device, and a tail-end swing support mechanism. The boat base is suspended from the base by four suspension devices. The feed end of the screen boat is slightly higher and supported by the drive device, creating an inclination angle between the screen boat and the horizontal plane to facilitate material movement towards the tail. The discharge end of the screen boat is slightly lower and supported by the tail-end swing support mechanism on the boat base. A motor is mounted on the boat base, and power is transmitted to an eccentric rotating device via a belt. The eccentric rotating device drives the feed end of the screen boat to rotate. The movement trajectory of the screen boat from the feed end to the discharge end gradually changes from horizontal circular motion to elliptical motion, and finally to approximately reciprocating linear motion.

[0003] Material enters the screen vessel through the feed inlet. Under the action of the circular motion at the feed end of the screen vessel, it is rapidly and evenly distributed across the entire width of the screen surface, resulting in automatic grading. Smaller particles at the bottom of the material layer pass through the screen quickly, while larger particles at the top move downwards along the inclined surface of the screen vessel towards the discharge end. Near the discharge end, the movement of the screen vessel is an approximately reciprocating linear motion, which gradually weakens the screening effect, causing particles larger than the screen aperture size to move rapidly towards the outlet until they are discharged from the machine, completing the entire screening process.

[0004] To improve screening efficiency, screening vessels typically have two or more layers of screen surfaces, which are fixed to the screen frame around their perimeter. Currently, there is no supporting mechanism between the upper and lower screen frames in flat rotary screens; each layer requires a support structure, and the screen frames are fixed at the top using pressure plates and bolts. This presents the following problems:

[0005] 1. Disassembly and assembly require removing multiple bolts from the screen, which is labor-intensive and inconvenient. Moreover, disassembly and assembly can only be performed from the front and back, and cannot be performed from the top and bottom.

[0006] 2. Due to the small distance requirement between the upper pressure plate and the screen frame, the pressure gap is not large, making it difficult to insert and pull out the screen frame;

[0007] 3. When using multi-layer screen frames, the screen frames must have supporting steps. Especially when there are two or more layers, the processing requirements are also high. The more welding points there are, the less reliable the vibrating components become.

[0008] 4. Screens are consumable parts. When production is high, each factory may have more than 50 screens. The shorter the replacement time, the better. Currently, there are too many screen pressing bolts, which cannot be disassembled from the top. The replacement time is long, which affects the output.

[0009] 5. The screen is pulled out from the front and rear ends, requiring a large maintenance space between adjacent devices, which increases the footprint of the equipment. Utility Model Content

[0010] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, and such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0011] In view of the problems existing in the above and / or prior art, this utility model is proposed.

[0012] The purpose of this utility model is to overcome the problems existing in the prior art and provide a screen frame tensioning mechanism for a planar rotary screen, which can quickly tension the screen frame and also quickly release it from the tensioned state, greatly improving the efficiency of loading and unloading the screen body, and requiring little space.

[0013] To solve the above technical problems, this utility model provides a screen frame supporting mechanism for a planar rotary screen, including a screen boat with screen boat frame sides on both sides. A supporting step is provided on the lower part of the inner wall of the screen boat frame. Supporting mechanisms are respectively provided below the long side of the upper screen frame. Each supporting mechanism includes a screw shaft, the rear end of which is a threaded section screwed into a fixing nut, and the front end of which is a smooth shaft passing through axial holes of at least two drive bodies. Each drive body has axially limiting blocks on its front and rear sides, and each limiting block is fixed to the screw shaft. Each drive body has a drive body transverse shaft on its side facing the screen boat frame. An upper support arm and a lower support arm are respectively hinged to each drive body transverse shaft. An upper pressure frame is hinged to the upper end of the upper support arm, and the upper pressure frame abuts against the lower side of the upper screen frame. A lower pressure frame is hinged to the lower end of the lower support arm, and the lower pressure frame is supported on the long side of the lower screen frame or on the supporting step.

[0014] As an improvement of this utility model, the fixing nut is fixed to one end of the nut fixing seat, and the other end of the nut fixing seat is fixed to the inner wall of the screen boat frame.

[0015] As a further improvement of this utility model, a rotating handle is connected to the rear end of the screw shaft.

[0016] As a further improvement of this utility model, the upper pressure frame and the lower pressure frame are channel steel with openings facing each other. The upper end of the upper support arm and the lower end of the lower support arm are each hinged to the pin hole of the reinforcing plate through the support arm pin. The reinforcing plate is welded to the inner walls of both sides of the channel steel.

[0017] As a further improvement of this utility model, the common ends of the upper support arm and the lower support arm are fitted together by a male and female tenon structure, and the lower support arm is located between the two forks of the upper support arm.

[0018] As a further improvement of this utility model, the limiting block is fixed to the screw shaft by a set screw or a through bolt.

[0019] As a further improvement of this utility model, the top of the screen boat is provided with a screen boat cover, and the upper pressure frame presses the screen frame tightly against the bottom of the screen boat cover.

[0020] Compared with the prior art, the advantages or beneficial effects of the embodiments of this application include at least the following: 1. The quick-tensioning mechanism is easy to use. The upper and lower plates can be opened by rotating the screw with the handle, thus tightening the space between the upper and lower screen frames; when screening in large batches, the time for customers to change screens and maintain them is reduced by more than 50%.

[0021] 2. The tolerance range of the screen mounting height of the multi-layer screen frame can be increased, the number of welding points is reduced, the cracking of welding points caused by vibration is greatly reduced, and the requirements for manufacturing difficulty are lowered.

[0022] 3. The screen frame can be disassembled from the top cover upwards. The entire rotating screen body can be dropped out through the tooling. The entire screen frame falls from top to bottom, which is very convenient for installation. The advantages are more obvious when screening multiple layers, and the space requirements are low. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The drawings are provided for reference and illustration only and are not intended to limit this utility model. Wherein:

[0024] Figure 1 This is the front view of a planar rotary screen;

[0025] Figure 2 A top view of a planar rotary screen after removing the screen boat cover and screen body;

[0026] Figure 3 A three-dimensional view of a planar rotary screen after removing the screen boat cover and screen body;

[0027] Figure 4for Figure 1 Sectional view along the middle AA;

[0028] Figure 5 for Figure 4 A magnified view of the rear end of the central tensioning mechanism;

[0029] Figure 6 A three-dimensional diagram of the tensioning mechanism;

[0030] Figure 7 A 3D diagram showing the rear end of the support mechanism;

[0031] Figure 8 An exploded view to support the rear of the mechanism;

[0032] Figure 9 for Figure 4 A magnified view of a portion of the image;

[0033] Marked in the diagram: 1. Screening boat; 1a. Cover of the screening boat;

[0034] 2. Suspend the main base; 3. Suspension ropes;

[0035] 4. Screen boat frame; 4a. Support steps;

[0036] 5. Screen frame;

[0037] 6. Tensioning mechanism; 6a. Rotary handle; 6b. Screw shaft; 6c. Fixing nut; 6d. Nut fixing seat; 6e. Drive body; 6e1. Drive body horizontal shaft; 6f. Limiting block; 6g. Upper support arm; 6h. Lower support arm; 6j. Bolt shaft; 6k. Reinforcing plate;

[0038] 7. Upper pressure frame; 8. Lower pressure frame. Detailed Implementation

[0039] In the following description of this utility model, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", 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 mean that the device must have a specific orientation.

[0040] To make the technical means, creative features, achieved objectives and effects of this utility model easier to understand, the present utility model will be further described below with reference to specific illustrations. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0042] like Figures 1 to 8 As shown, the planar rotary screen of this utility model includes a screen boat 1, a main suspension base 2, and suspension ropes 3. The feed end of the screen boat 1 is higher than the discharge end. The top of the feed end of the screen boat 1 is provided with a feed inlet, and the bottom of the discharge end of the screen boat 1 is provided with a discharge outlet. The main suspension base 2 is located below the screen boat 1, and the four corners of the main suspension base 2 are suspended from the upper frame by suspension ropes 3. The feed end of the screen boat 1 is supported on an eccentric rotating mechanism, and the stern of the screen boat is supported on a stern swing support mechanism.

[0043] Material enters the screen vessel 1 through the feed inlet. Under the action of the circular motion at the feed end of the screen vessel 1, it is rapidly and evenly distributed across the entire width of the screen surface, resulting in automatic grading. Smaller particles at the bottom of the material layer pass through the screen quickly, while larger particles at the top move downwards along the inclined surface of the screen vessel 1 towards the discharge end. Near the discharge end, the movement of the screen vessel 1 is an approximately reciprocating linear motion, which gradually weakens the screening effect, causing particles larger than the screen aperture size to move rapidly towards the outlet until they are discharged from the machine, completing the entire screening process.

[0044] The screen boat 1 has screen boat frame 4 on both sides. The lower part of the inner wall of the screen boat frame 4 is bent inward and downward to form a support step 4a. A single-layer screen body, a double-layer screen body or a multi-layer screen body is placed on the support step 4a. Each screen body includes a rectangular screen frame 5 and a screen mesh fixed in the screen frame 5.

[0045] Taking a single-layer screen body as an example: A tensioning mechanism 6 is provided between the long side of the screen frame 5 and the supporting step 4a. The tensioning mechanism 6 includes a rotating handle 6a, a screw shaft 6b, a fixing nut 6c, a nut fixing seat 6d, a driving body 6e, a driving body horizontal shaft 6e1, a limiting block 6f, an upper supporting arm 6g, a lower supporting arm 6h, and a supporting arm pin. The threaded section at the rear end of the screw shaft 6b is screwed into the fixing nut 6c, which is fixed in the nut fixing seat 6d. The nut fixing seat 6d is a bent plate fixed to the inner wall of the screen frame 4. A rotating handle 6a is provided at the rear end of the screw shaft 6b. The main body extending forward from the screw shaft 6b is a smooth shaft, and at least two driving bodies 6e are evenly fitted along the length of the smooth shaft, usually three. Limiting blocks 6f are provided on the front and rear sides of each driving body 6e, and the limiting blocks 6f are respectively fitted onto the screw shaft 6b and fixed by set screws or through bolts. When the screw shaft 6b is rotated by rotating handle 6a, the screw shaft 6b generates axial displacement while rotating in the fixing nut 6c; at the same time, the screw shaft 6b rotates freely in the axial hole of the drive body 6e, and while rotating, it drives the drive body 6e to translate axially through the limit block 6f.

[0046] A drive body horizontal shaft 6e1, integrally connected to the inner wall of the screen vessel frame 4, is provided on the side of the drive body 6e facing it. An upper support arm 6g and a lower support arm 6h, symmetrically open in the height direction, are hinged to the drive body horizontal shaft 6e1. The upper end of the upper support arm 6g is connected to the upper pressure frame 7 via a support arm pin, and the lower end of the lower support arm 6h is connected to the lower pressure frame 8 via a support arm pin. The support arm pin can be a bolt shaft 6j, that is, the smooth section of the middle part of the bolt serves as the hinge shaft.

[0047] The lower pressure frame 8 is supported on the support step 4a, and the upper pressure frame 7 abuts against the lower side of the upper screen frame 5. The upper pressure frame 7 and the lower pressure frame 8 are channel steel with openings facing each other. The two inner corners of the channel steel that are hinged to the support arm pin are respectively welded with reinforcing plates 6k, and the two ends of the support arm pin are respectively hinged in the pin holes of the reinforcing plates 6k.

[0048] When the drive body 6e moves with the screw shaft 6b, the horizontal shaft 6e1 of the drive body drives the common end of the upper support arm 6g and the lower support arm 6h to move back and forth, causing a change in the opening height between the upper support arm 6g and the lower support arm 6h, that is, a change in the included angle between the upper support arm 6g and the lower support arm 6h. When the opening height increases, the distance between the upper pressure frame 7 and the lower pressure frame 8 increases, quickly pressing the upper screen frame 5 against the bottom cover 1a, entering the ready-to-work state. When the opening height decreases, the distance between the upper pressure frame 7 and the lower pressure frame 8 decreases, and the upper screen frame 5 quickly disengages from the pressed state, facilitating rapid replacement. All of the above processes can be achieved without disassembling numerous bolts and pressure bars.

[0049] The common ends of the upper support arm 6g and the lower support arm 6h can be fitted together by male and female tenons. The lower support arm 6h is located between the two forks of the upper support arm 6g, or vice versa, which is conducive to applying support force symmetrically.

[0050] When it is a double-layer or multi-layer screen body, the support of the lower screen body is the same as above, and the tensioning mechanism of the upper screen body is stacked on the long side of the lower screen frame 5.

[0051] The above description is merely a preferred embodiment of the present utility model, showing and describing the basic principles, main features, and advantages of the present utility model. It is not intended to limit the scope of patent protection of the present utility model. Those skilled in the art should understand that the present utility model is not limited to the above embodiments. In addition to the above embodiments, the present utility model may have other implementations without departing from the spirit and scope of the present utility model. Various changes and improvements to the present utility model are also possible. All technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by the present utility model. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents. Technical features not described in the present utility model can be implemented by or using existing technology, and will not be elaborated here.

Claims

1. A screen frame supporting mechanism for a planar rotary screen, comprising a screen boat (1), screen boat frame edges (4) on both sides of the screen boat (1), and a supporting step (4a) on the lower part of the inner wall of the screen boat frame edges (4), characterized in that: A tensioning mechanism (6) is provided below the long side of the upper screen frame. The tensioning mechanism (6) includes a screw shaft (6b), the rear end of which is a threaded section and screwed into a fixing nut (6c), the front end of which is a smooth shaft and passes through the axial holes of at least two driving bodies (6e), and each driving body (6e) is provided with a limiting block (6f) on its front and rear sides for axial limiting, and each limiting block (6f) is fixed on the screw shaft (6b); Each drive body (6e) has a drive body horizontal shaft (6e1) on the side facing the screen frame (4). Each drive body horizontal shaft (6e1) is respectively hinged with an upper support arm (6g) and a lower support arm (6h). The upper end of the upper support arm (6g) is hinged with an upper pressure frame (7), which abuts against the lower side of the screen frame of the upper screen. The lower end of the lower support arm (6h) is hinged with a lower pressure frame (8), which is supported on the lower side of the screen frame of the lower screen or on the support step (4a).

2. The screen frame supporting mechanism of the planar rotary screen according to claim 1, characterized in that: The fixing nut (6c) is fixed to one end of the nut fixing seat (6d), and the other end of the nut fixing seat (6d) is fixed to the inner wall of the screen boat frame (4).

3. The screen frame supporting mechanism of the planar rotary screen according to claim 1, characterized in that: The rear end of the screw shaft (6b) is connected to a rotary handle (6a).

4. The screen frame tensioning mechanism according to claim 1, characterized in that: The upper pressure frame (7) and the lower pressure frame (8) are channel steels with openings facing each other. The upper end of the upper support arm (6g) and the lower end of the lower support arm (6h) are each hinged to the pin hole of the reinforcing plate (6k) through the support arm pin (6j). The reinforcing plate (6k) is welded to the inner walls of both sides of the channel steel.

5. The screen frame supporting mechanism according to claim 1, characterized in that: The common ends of the upper support arm (6g) and the lower support arm (6h) are fitted together by a male and female tenon structure, and the lower support arm (6h) is located between the two forks of the upper support arm (6g).

6. The screen frame tensioning mechanism according to claim 1, characterized in that: The limiting block (6f) is fixed to the screw shaft (6b) by a set screw or a through bolt.

7. The screen frame tensioning mechanism according to any one of claims 1 to 6, characterized in that: The top of the screen boat (1) is provided with a screen boat cover (1a), and the upper pressure frame (7) presses the screen frame (5) against the bottom of the screen boat cover (1a).

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