Novel polyurethane screen

Abstract

The utility model discloses a novel polyurethane screen mesh. An outer frame is of a square hollow structure, a square screen is detachably installed in the outer frame, screen holes are formed in the center of the screen, and pressurizing slope parts and positioning grooves are formed in the four sides of the screen. Sliding grooves are formed in the centers of the four side edges of the outer frame, positioning blocks are embedded in the sliding grooves in a sliding mode, each positioning block is provided with a pressed slope part and a sliding lug block, each sliding lug block is connected with a guide rod, and the ends of the guide rods are sleeved with baffles, provided with compression springs and further provided with auxiliary positioning assemblies. During installation, the screen is matched with the inclined faces of the positioning blocks to enable the positioning blocks to slide, and the positioning blocks are clamped into the positioning grooves to be fixed under the action of springs. During disassembly, the pull ring is pulled to separate the positioning block, and the movement of the positioning block is limited by the limiting lifting stop block. The screen is convenient to mount and demount, stable in positioning, wear-resistant and corrosion-resistant due to the fact that the front face, the back face and the mounting angle do not need to be considered, the problems that a traditional screen is difficult to mount, poor in positioning, prone to damage and the like are effectively solved, and the screen is suitable for multi-industry material screening operation.

Description

Technical Field

[0001] This utility model relates to the field of screening equipment technology, and in particular to a novel polyurethane screen. Background Technology

[0002] In industrial material screening operations, screen installation is always a critical step. Traditional screens typically employ complex fixing methods, such as bolting and welding. These methods not only require highly skilled operators but also necessitate significant time for precise angle adjustments and alignment. For instance, in screening equipment used in some fine chemical industries, even slight misalignment of the screen installation can lead to material clogging of the screen holes or incomplete screening, severely impacting production efficiency and product quality. Moreover, once installed, subsequent disassembly is cumbersome, often requiring specialized tools for extensive disassembly of the equipment. This not only consumes manpower and resources but can also damage the screen and equipment frame due to improper operation, increasing maintenance costs and downtime.

[0003] The positioning stability of traditional screens during operation is also a problem that urgently needs to be solved. Due to the lack of effective positioning and anti-displacement design, screens are prone to displacement or loosening under the influence of material impact and equipment vibration over a long period of time. Taking ore screening operations in the mining industry as an example, the huge impact force of ore will cause the screen to shake continuously. If the screen is not firmly positioned, the gap between it and the equipment frame will gradually increase, causing some small particles of ore to leak through the gaps, making effective screening impossible and reducing the utilization rate of ore. At the same time, the loosening of the screen may also cause abnormal vibration of the equipment, accelerate the wear of equipment parts, shorten the service life of the equipment, and may even cause safety accidents, resulting in incalculable losses to the enterprise.

[0004] Existing screen materials exhibit significant performance limitations when facing complex and ever-changing industrial environments. Many traditional screens are made of metal, which, while possessing a certain strength, suffers from poor corrosion resistance. In industries such as chemical and food processing, where corrosive media are frequently encountered, metal screens are prone to rust and corrosion, affecting not only their appearance but, more importantly, reducing their structural strength and screening accuracy. While some non-metallic screens offer improved corrosion resistance, they often suffer from insufficient wear resistance. Under high-wear conditions, such as screening building materials, screens quickly develop wear and holes, and frequent replacements increase production costs and the risk of production interruptions. Therefore, the market urgently needs a screen material and structural design that offers excellent wear and corrosion resistance, ensures stable positioning, and facilitates easy installation and disassembly. Utility Model Content

[0005] This utility model provides a novel polyurethane screen, comprising a square hollow outer frame, inside which a square screen is detachably installed. The screen has several sieve holes for screening impurities distributed in its center. A 45-degree angled pressure ramp is formed at the midpoint of the top and bottom ends of each of the four sides of the screen. A positioning groove is formed at the center of each of the four sides of the screen. A through-groove is formed at the center of each of the four sides of the outer frame. A positioning block is slidably embedded in each groove, and each positioning block is aligned with a positioning block on an adjacent side. The positioning block is adapted to the positioning groove. Both the upper and lower ends of the positioning block near the positioning groove are provided with a pressure-bearing slope at a 45-degree angle. Both sides of the positioning block are provided with sliding lugs, which are slidably inserted into the groove. The side of the sliding lug away from the screen is provided with a guide rod. The ends of the guide rods on adjacent sides are slidably fitted with the same baffle. Both ends of the baffle are fixed to the outer wall of the outer frame by bolts. The outer circumferential surface of the guide rod near the position between the sliding lug and the baffle is fitted with a compression spring. The end of the guide rod is provided with an auxiliary positioning component for controlling the position of the positioning block.

[0006] Furthermore, the auxiliary positioning component includes the same connecting rod installed at the end of the guide rod on an adjacent side. Each connecting rod has a vertically positioned limiting lifting block at its top. The bottom of the limiting lifting block slides against the top of the connecting rod. Each limiting lifting block has a guide column slidably inserted at its bottom. The bottom end of the guide column is connected to the outer wall of the outer frame.

[0007] Furthermore, a pull ring is provided on the side wall of each connecting rod.

[0008] Furthermore, the screen is made of polyurethane material.

[0009] Structural composition

[0010] Outer frame:

[0011] The novel polyurethane screen of this utility model includes a square hollow outer frame made of a sturdy and durable material, which provides a supporting foundation for the entire screen structure. A through groove is provided at the center of each of the four sides of the outer frame. The groove is used to install positioning blocks and allow them to slide within it to achieve the positioning and fixing functions of the screen.

[0012] sieve:

[0013] The rectangular screen is made of polyurethane, which has good wear resistance, corrosion resistance, and elasticity. It is detachably installed inside the outer frame. The screen has several sieve holes in its center for screening impurities. Each of its four sides has a 45-degree angled pressure ramp at the center of its top and bottom ends. During installation, this ramp mates with the pressure ramp of the positioning block, facilitating the sliding and positioning of the positioning block. A positioning groove is also provided at the center of each of the four sides to engage with the positioning block, ensuring stable installation of the screen within the outer frame.

[0014] Positioning blocks and related components:

[0015] Each positioning block is adapted to the positioning groove on the adjacent side. At the end closest to the positioning groove, both the upper and lower ends are provided with a 45-degree angled pressure ramp. Sliding lugs are provided on both vertical sides, and these lugs are slidably inserted into the groove to ensure smooth sliding of the positioning block within the groove. A guide rod is provided laterally on the side of the sliding lug away from the screen. The ends of the guide rods on adjacent sides are slidably fitted with the same baffle. Both ends of the baffle are fixed to the outer wall of the outer frame with bolts. A compression spring is fitted on the outer circumference of the guide rod near the position between the sliding lug and the baffle. The compression spring provides a restoring force to the positioning block, allowing it to automatically embed into the positioning groove during installation. During disassembly, the spring force must be overcome to disengage the positioning block from the positioning groove.

[0016] Assisted positioning components:

[0017] The auxiliary positioning assembly includes a single connecting rod mounted on the ends of guide rods on adjacent sides, used to connect multiple guide rods so they can work together. Each connecting rod has a vertically positioned limiting lifting block at its top, with its bottom slidably abutting against the top of the connecting rod. A guide post is slidably inserted into the bottom of each limiting lifting block, with its bottom end connected to the outer wall of the outer frame. In normal installation, the limiting lifting block provides a limiting assist function for the connecting rod, preventing the positioning block from accidentally disengaging. During disassembly, if the travel of the connecting rod exceeds the width of the limiting lifting block, the limiting lifting block can be operated to lock it between the connecting rod and the baffle, restricting the movement of the positioning block. Furthermore, each connecting rod has a pull ring on its side wall, allowing operators to easily pull the connecting rod to initiate the screen disassembly process.

[0018] Beneficial effects

[0019] 1. The screen and outer frame are automatically positioned and fixed using the spring force of a compression spring through the cooperation of the pressure ramp, the pressure-bearing ramp, the positioning groove, and the positioning block. This eliminates the need for complex alignment and fixing operations during installation, greatly improving installation efficiency. During disassembly, pulling the connecting rod with the pull ring, combined with the operation of the limit lifting block, easily disengages the positioning block from the positioning groove, completing the screen removal. After disassembly, the positioning block automatically resets, facilitating the quick installation of the next screen.

[0020] 2. The tight engagement between the positioning block and the positioning groove, as well as the limiting function of the auxiliary positioning components, effectively prevents the screen from shifting or loosening during operation, ensuring the accuracy and reliability of the screening operation.

[0021] 3. The square design of the screen and the fact that it does not need to consider the front and back or the installation angle make it highly versatile, reducing the difficulty of installation and the skill requirements for operators, and reducing the risk of screen damage due to improper installation.

[0022] 4. The screen is made of polyurethane material, which has excellent wear resistance and corrosion resistance. It can work stably for a long time in harsh working environments, extending the service life of the screen and reducing the maintenance cost and replacement frequency of the equipment.

[0023] This novel polyurethane screen, through its unique structural design, effectively solves the problems of traditional screens in terms of installation, disassembly, positioning, and durability, and has broad application prospects in the field of industrial screening.

[0024] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of a novel polyurethane screen proposed in this utility model;

[0026] Figure 2 This utility model provides a schematic diagram of the outer frame and internal cross-sectional structure of a novel polyurethane screen.

[0027] Figure 3 This utility model proposes a novel polyurethane screen. Figure 1 A magnified schematic diagram of the local structure at point A;

[0028] Figure 4 This utility model provides a schematic diagram of the outer frame and internal cross-sectional structure of a novel polyurethane screen.

[0029] Figure 5 This utility model proposes a novel polyurethane screen. Figure 4 A magnified schematic diagram of the local structure at point B.

[0030] In the diagram: 1. Outer frame; 2. Screen; 3. Slide groove; 4. Positioning block; 5. Sliding lug; 6. Guide rod; 7. Baffle; 8. Compression spring; 9. Connecting rod; 10. Pull ring; 11. Guide slide column; 12. Limiting lifting block; 201. Pressurizing ramp; 202. Positioning groove; 203. Screen hole; 41. Pressurized ramp. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0032] Example 1, referring to Figures 1 to 5

[0033] A novel polyurethane screen

[0034] Material preparation and component processing:

[0035] First, a high-quality polyurethane material is selected to make the screen 2. Its size is determined to be square according to the design requirements, and several screen holes 203 for screening impurities are distributed in the center. A pressure slope 201 with a 45-degree inclination is precisely machined at the middle position of the upper and lower ends of the four sides of the screen 2, and a positioning groove 202 is machined in the center of the four sides.

[0036] For the outer frame 1, a square hollow structure is made of suitable metal material, and through grooves 3 are machined at the center of the four sides. The positioning block 4 is made according to the matching requirements with the positioning groove 202. At the end of the block closest to the positioning groove 202, a pressure-bearing ramp 41 with a 45-degree inclination angle is machined at both the top and bottom, and sliding lugs 5 are installed on both vertical sides. The guide rod 6, baffle 7, compression spring 8, connecting rod 9, pull ring 10, guide slide column 11, and limit lifting block 12 are all manufactured according to their respective design specifications to ensure that the dimensional accuracy and performance of each component meet the requirements.

[0037] Installation steps:

[0038] Align the screen 2 with the outer frame 1, and gradually bring the screen 2 closer to the opening of the outer frame 1.

[0039] As the screen 2 approaches, the pressure ramp 201 of the screen 2 begins to contact the pressure ramp 41 of the positioning block 4. Due to the effect of the ramp, when pressure is applied, the positioning block 4 will slide outward along the groove 3 of the outer frame 1, and the sliding lug 5 will slide stably in the groove 3. At the same time, the compression spring 8 will be gradually compressed.

[0040] When the screen 2 is pushed to the appropriate position, the positioning grooves 202 on the four sides of the screen 2 are exactly aligned with the positioning block 4.

[0041] At this time, under the action of the rebound force of the compression spring 8, the positioning block 4 quickly embeds into the corresponding positioning groove 202, realizing the initial positioning and fixation of the screen 2 in the outer frame 1.

[0042] Finally, the baffle 7 is fixed to the outer wall of the outer frame 1 with bolts, so that the end of the guide rod 6 is restricted between the baffle 7 and the sliding lug 5, and the compression spring 8 is in normal compression working state. This completes the installation of the screen 2. Throughout the installation process, due to the square design of the screen 2 and the outer frame 1, and the fact that there is no need to consider the front and back sides or installation angle, the installation operation is extremely simple and quick, requiring no complicated error-proofing design or angle adjustment steps.

[0043] Disassembly steps:

[0044] When it is necessary to disassemble screen 2, the operator manually grasps the pull ring 10 and pulls it outward.

[0045] Pulling the ring 10 causes the connecting rod 9 to move outward, which in turn causes the guide rod 6 and the positioning block 4 connected to the guide rod 6 to move outward against the elastic force of the compression spring 8, so that the positioning block 4 gradually comes out of the positioning groove 202 of the screen 2.

[0046] During the outward movement of the connecting rod 9, when the travel exceeds the width of the limit lifting block 12, the operator presses the limit lifting block 12 downward along the guide slide 11.

[0047] The limiting lifting stop 12 is locked between the connecting rod 9 and the baffle 7. At this time, the movement of the positioning block 4 is effectively restricted and cannot rebound under the action of the compression spring 8.

[0048] Then, the screen 2 can be easily removed from the outer frame 1 to complete the disassembly operation.

[0049] After disassembly, pull out the limiting lifting block 12, which is locked between the connecting rod 9 and the baffle 7, to release the restriction on the positioning block 4. Under the elastic force of the compression spring 8, the positioning block 4 automatically returns to its initial position, so as to quickly carry out the installation operation of the next screen 2.

[0050] Through the above specific implementation methods, this new type of polyurethane screen can be installed and disassembled conveniently and efficiently, which can effectively improve work efficiency and reduce maintenance costs in practical applications.

[0051] The working principle of this utility model is as follows:

[0052] I. Installation Principle

[0053] Positioning and Card Connection:

[0054] When the screen 2 is installed onto the outer frame 1, the pressure ramps 201 on all four sides of the screen 2 first come into contact with the pressure ramps 41 of the positioning blocks 4 in the outer frame 1. Since both are at a 45-degree angle, relative sliding will occur when an installation force is applied. This sliding causes the positioning blocks 4 to move outward along the grooves 3 of the outer frame 1, and the sliding lugs 5 on both sides of the positioning blocks 4 slide smoothly within the grooves 3, while the compression springs 8 are compressed. When the screen 2 is pushed to the appropriate position, the positioning grooves 202 on all four sides align with the positioning blocks 4, the compression springs 8 rebound, and push the positioning blocks 4 into the positioning grooves 202, thus achieving the initial positioning and fixation of the screen 2 within the outer frame 1.

[0055] Auxiliary fixing and limiting:

[0056] In the auxiliary positioning assembly, the connecting rod 9 connects to the end of the adjacent guide rod 6. Under normal installation conditions, the limiting lifting block 12 is positioned under the guidance of the guide slide column 11, with its bottom sliding against the top of the connecting rod 9. Since the stroke generated by the pressure on the positioning block 4 will not exceed the width stroke of the limiting lifting block 12, the limiting lifting block 12 plays a certain limiting auxiliary role for the connecting rod 9, preventing the positioning block 4 from accidentally dislodging from the positioning groove 202, and further ensuring the stability of the screen 2 after installation. At the same time, the baffle 7 is fixed to the outer wall of the outer frame 1 by bolts, and cooperates with the sliding lug 5 to limit the displacement range of the guide rod 6 and the positioning block 4, preventing excessive displacement.

[0057] II. Disassembly Principle

[0058] Initiate disassembly:

[0059] When it is necessary to disassemble the screen 2, the operator pulls the pull ring 10, which drives the connecting rod 9 to move outward, thereby causing the guide rod 6 to move outward. The positioning block 4 then overcomes the elastic force of the compression spring 8 and gradually comes out of the positioning groove 202 of the screen 2.

[0060] Limiting rebound:

[0061] When the travel of the connecting rod 9 exceeds the width of the limiting lifting block 12, the limiting lifting block 12 is pressed down along the guide slide 11, causing it to lock between the connecting rod 9 and the baffle 7. This restricts the rebound movement of the positioning block 4 under the action of the compression spring 8, keeping the positioning block 4 in the state of being disengaged from the positioning groove 202.

[0062] Complete disassembly and reassembly preparations:

[0063] At this point, the screen 2 can be easily removed from the outer frame 1, completing the disassembly operation. After disassembly, the limiting lifting block 12, which is locked between the connecting rod 9 and the baffle 7, is pulled upward to release the restriction on the positioning block 4. Under the elastic force of the compression spring 8, the positioning block 4 automatically returns to its initial position, preparing for the next installation of the screen 2.

[0064] The working principle of this new polyurethane screen is based on a clever mechanical structure design. Through the synergistic effect between its components, the screen can be easily installed and disassembled, and maintains a stable and reliable working state after installation, effectively improving the efficiency and ease of maintenance of the equipment.

[0065] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A novel polyurethane screen, comprising a square hollow outer frame (1), wherein a square screen (2) is detachably installed inside the outer frame (1), and the screen (2) has a plurality of sieve holes (203) distributed in the center for screening impurities, characterized in that, The screen (2) has a pressure ramp (201) with a 45-degree inclination at the middle of the top and bottom ends of each of its four sides. The screen (2) has a positioning groove (202) at the center of each of its four sides. The outer frame (1) has a through groove (3) at the center of each of its four sides. A positioning block (4) is slidably embedded inside each groove (3). Each positioning block (4) is adapted to the positioning groove (202) on the adjacent side. The positioning block (4) has a pressure ramp (41) with a 45-degree inclination at both the top and bottom ends of its end near the positioning groove (202). The positioning block (4) has sliding lugs (5) on both vertical sides. The sliding lugs (5) are slidably inserted into the sliding groove (3). The sliding lugs (5) on the side away from the screen (2) are provided with guide rods (6) laterally. The ends of the guide rods (6) on adjacent sides are slidably fitted with the same baffle (7). Both ends of the baffle (7) are fixed to the outer wall of the outer frame (1) by bolts. The outer circumferential surface of the guide rod (6) near the position between the sliding lugs (5) and the baffle (7) is fitted with compression springs (8). The ends of the guide rods (6) are provided with auxiliary positioning components for controlling the position of the positioning block (4).

2. The novel polyurethane screen according to claim 1, characterized in that, The auxiliary positioning component includes the same connecting rod (9) installed at the ends of the guide rods (6) on adjacent sides. Each connecting rod (9) has a vertically positioned limiting lifting block (12) at its top. The bottom of the limiting lifting block (12) slides against the top of the connecting rod (9). Each limiting lifting block (12) has a sliding guide column (11) inserted into its bottom. The bottom end of the guide column (11) is connected to the outer wall of the outer frame (1).

3. The novel polyurethane screen according to claim 2, characterized in that, Each connecting rod (9) has a pull ring (10) on its side wall.

4. The novel polyurethane screen according to claim 1, characterized in that, The screen (2) is made of polyurethane material.

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