Los angeles abrasion tester with noise reduction

Abstract

The utility model relates to the technical field of los angeles abrasion tester, specifically relates to a los angeles abrasion tester with noise reduction function, including base, the gearbox of setting on the base, two support frames and the drum of rotating control through gearbox, the drum includes inner tube and outer tube, the inner tube is polyurethane rubber material, and the inner tube and outer tube form the sound insulation cavity of sealing, and the cavity is filled with sound absorption cotton, and the lower portion of drum is equipped with screen frame, and the both ends of screen frame are rotatably installed on the corresponding pivot, the double -deck structure of inner tube and outer tube is used to the drum, and fills sound absorption cotton, and can effectively absorb the noise of the collision of sample and cylinder wall, the polyurethane rubber material can reduce the rigid impact of sample collision, reduce noise from the source, solve the problem that the traditional equipment is running noisy, the both ends of screen frame are rotatably installed on the pivot, and reciprocating swing along the pivot of screen frame can be controlled through the handle, realize the quick separation of coarse and fine aggregate, need not extra carry material and carry out screening, reduce the artificial labor intensity.

Description

Technical Field

[0001] This utility model relates to the field of Los Angeles abrasion tester technology, specifically to a Los Angeles abrasion tester with noise reduction function. Background Technology

[0002] In fields such as highway engineering and building materials, the Los Angeles abrasion tester is an important device for determining the ability of stone to resist the combined effects of friction and impact. Its test results are of key significance for evaluating the durability of stone in actual use.

[0003] The Los Angeles abrasion tester is widely used in the Kentucky dispersion test of asphalt mixtures. On the one hand, when the instrument is working, the sample inside the drum collides and rubs frequently and violently with the metal inner wall of the drum and with the sample itself. The noise generated during operation can reach more than 85 dB. This noise seriously affects the laboratory environment, and long-term use may damage the hearing of operators and interfere with other precision tests. On the other hand, after the abrasion test is completed by the Los Angeles abrasion tester, the material inside the drum needs to be poured into the sieve frame and manually lifted to screen it in order to determine the content of materials of different particle sizes. However, this screening method requires a lot of labor. Utility Model Content

[0004] This invention addresses the shortcomings of existing technologies by providing a Los Angeles abrasion tester with noise reduction capabilities, thereby resolving the problems mentioned in the background section.

[0005] To achieve the above technical objectives, this utility model proposes the following technical solution: a Los Angeles abrasion tester with noise reduction function, comprising a base, a gearbox mounted on the base, two support frames, and a roller controlled by the gearbox. The roller has a hollow structure and is installed between the two support frames. Each support frame is provided with a bearing seat. Both ends of the roller are mounted on corresponding bearing seats via rotating shafts. The end of the rotating shaft near the gearbox passes through the bearing seat and is connected to the gearbox. The radial sidewall opening of the roller forms a feeding port, and a sealing cap is connected to the feeding port. The roller includes an inner cylinder and an outer cylinder. The inner cylinder is made of polyurethane rubber. The inner cylinder and the outer cylinder form a sealed sound-insulating cavity, which is filled with sound-absorbing cotton. A sieve frame is provided below the roller, and both ends of the sieve frame are rotatably mounted on corresponding rotating shafts.

[0006] Furthermore, the screen frame includes a screen mesh with an arc-shaped cross-section, screen plates are fixedly connected to both ends of the screen mesh, and a bearing with a housing is rotatably mounted on the rotating shaft. The bottom of the bearing is connected to the screen plate by bolts.

[0007] Furthermore, a connecting shaft is threaded onto the screen plate, and a roller is rotatably connected to the connecting shaft. One end of the connecting shaft passes through the roller and is connected to a handle. An arc-shaped hole is provided on the side wall of the support frame away from the gearbox, and the roller is set in the arc-shaped hole. The rotation angle of the screen frame is controlled by changing the position of the roller in the arc-shaped hole.

[0008] Furthermore, a sliding groove is provided on the side of the support frame that has the arc-shaped hole, and the sliding groove communicates with the arc-shaped hole.

[0009] Furthermore, a screw rod is threadedly connected above the arc-shaped hole, and a threaded hole adapted to the screw rod is provided on the sieve plate.

[0010] Furthermore, the sealing cover includes an inner cover and an outer cover, which form a sealed chamber filled with sound-absorbing cotton.

[0011] Furthermore, a screw rod is fixedly connected to the periphery of the feeding port, and the periphery of the outer cover is provided with mounting holes that match the screw rod. A handle is provided on the outer cover.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: The roller of this utility model adopts a double-layer structure of inner and outer cylinders and is filled with sound-absorbing cotton, which can effectively absorb the noise generated by the collision between the sample and the cylinder wall; the polyurethane rubber material of the inner cylinder can reduce the hard impact when the sample collides, reduce noise from the source, solve the problem of high noise during operation of traditional equipment, improve the laboratory environment, and protect the hearing of operators; the sealing cover adopts a double-layer structure of inner and outer cover, and the middle cavity is also filled with sound-absorbing cotton. Combined with the sealing design of the feeding port, it further reduces noise leakage from the feeding port and enhances the overall sound insulation effect; the two ends of the sieve frame are rotatably mounted on the rotating shaft. The rollers are driven to move in the arc-shaped hole by the grip rod, which can control the sieve frame to swing back and forth along the rotating shaft to achieve rapid separation of coarse and fine aggregates. There is no need to carry materials for screening, reducing manual labor; at the same time, the sliding groove is connected to the arc-shaped hole. When it is necessary to pour out the coarse sample, the roller can slide into the sliding groove from the arc-shaped hole, which makes it easy to raise one side of the sieve frame and pour out the coarse sample quickly, making the operation convenient. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0015] Figure 3 This is a side view of the structure of this utility model;

[0016] Figure 4 This is a cross-sectional structural diagram of the roller of this utility model;

[0017] Figure 5This is a schematic diagram of the structure of the sieve frame of this utility model.

[0018] In the diagram: 1. Base; 2. Gearbox; 3. Support frame; 4. Roller; 41. Inner cylinder; 42. Outer cylinder; 43. Sound-absorbing cotton; 5. Bearing seat; 6. Rotating shaft; 7. Feed port; 8. Sealing cover; 81. Inner cover; 82. Outer cover; 9. Screen frame; 91. Screen mesh; 92. Screen plate; 10. Bearing; 11. Connecting shaft; 12. Roller; 13. Arc-shaped hole; 14. Sliding groove; 15. Handle; 16. Screw one; 17. Screw two; 18. Handle. Detailed Implementation

[0019] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0020] This utility model provides a Los Angeles abrasion tester with noise reduction function, including a base 1, a gearbox 2 set on the base 1, two support frames 3, and a roller 4 controlled by the gearbox 2. The gearbox 2 is equipped with a control board to control the gearbox 2. The roller 4 has a hollow structure and is installed between the two support frames 3. Each support frame 3 is fixedly installed with a bearing seat 5 by bolts. Both ends of the roller 4 are installed on the corresponding bearing seats 5 through rotating shafts 6. One end of the rotating shaft 6 near the gearbox 2 passes through the bearing seat 5 and is connected to the gearbox 2. The radial side wall opening of the roller 4 forms a feeding port 7, and a sealing cover 8 is connected to the feeding port 7. The roller 4 includes an inner cylinder 41 and an outer cylinder 42. The inner cylinder 41 is made of polyurethane rubber. The inner cylinder 41 and the outer cylinder 42 form a sealed sound insulation cavity, which is filled with sound-absorbing cotton 43. A screen frame 9 is provided below the roller 4. Both ends of the screen frame 9 are rotatably installed on the corresponding rotating shafts 6. A collection plate is placed at the bottom of the screen frame 9 to collect the fine aggregate after screening by the screen frame 9, which facilitates the collection of the screened fine aggregate.

[0021] like Figure 1 , Figure 2 and Figure 3As shown, a certain amount of coarse aggregate and steel balls are placed into the drum 4 through the feeding port 7, and then the feeding port 7 is sealed with the sealing cover 8. The drum 4 is then rotated by the gearbox 2 to conduct the test. After the test, the gearbox 2 is turned off to stop the drum 4 from rotating, the sealing cover 8 is opened to remove the steel balls from the drum 4, and then the drum 4 is driven to rotate so that the feeding port 7 faces downward. The material in the drum 4 is poured into the sieve frame 9. The sieve frame 9 is manually driven to swing back and forth along the rotating shaft 6 to separate the coarse and fine aggregates in the sieve frame 9. The screened coarse aggregate is washed and dried, and then measured to obtain the wear rate of the sample. When the drum 4 rotates, the sample in the drum 4 collides with the inner cylinder 41 made of polyurethane rubber. The hardness of the polyurethane rubber is preferably between Shore A 60° and 80°. Its hardness meets the noise reduction effect while ensuring that the coefficient of friction is close to the standard requirements. It can reduce the noise generated by the collision between the sample and the cylinder wall when the sample rolls in the drum 4, and at the same time meet the standard sample conditions. The sound-absorbing cotton 43 can further absorb the noise generated by the collision of the sample when it rolls in the drum 4.

[0022] The sieve frame 9 includes a sieve 91 with an arc-shaped cross-section. The two ends of the sieve 91 are fixedly connected to sieve plates 92. A bearing 10 with a housing is rotatably mounted on the rotating shaft 6. The bottom of the bearing 10 is connected to the sieve plate 92 by bolts.

[0023] like Figure 5 As shown, the sieve frame 9 is installed at the bottom of the bearing 10 by bolts, which makes it easy to replace the sieve frame 9 with different mesh sizes according to actual use. The arc-shaped sieve mesh 91 can better receive the sample discharged from the drum 4. Together with the sieve plate 92, it can better prevent the sample from slipping out of the sieve frame 9 when shaking the sieve frame 9.

[0024] A connecting shaft 11 is threaded onto the screen plate 92, and a roller 12 is rotatably connected to the connecting shaft 11. One end of the connecting shaft 11 passes through the roller 12 and is connected to a handle 15. An arc-shaped hole 13 is provided on the side wall of the support frame 3 away from the gearbox 2. The roller 12 is set in the arc-shaped hole 13. By changing the position of the roller 12 in the arc-shaped hole 13, the rotation of the screen frame 9 can be controlled by a certain angle.

[0025] like Figure 1 and Figure 3 As shown, by holding the handle 15, the roller 12 is driven to reciprocate along the arc hole 13, which can drive the sieve frame 9 to rotate a certain angle along the rotating shaft 6 (similar to swinging on a swing). The sieve frame 9 swings back and forth, which makes it easy to separate the coarse and fine samples in the sieve frame 9, avoiding the heavy physical labor of lifting the sieve frame for sieving in the subsequent sieving process.

[0026] A sliding groove 14 is provided on one side of the support frame 3 that has the arc-shaped hole 13, and the sliding groove 14 is connected to the arc-shaped hole 13.

[0027] like Figure 2 As shown, when it is necessary to pour out the coarse sample in the sieve frame 9, the roller 12 can slide out from the arc hole 13 through the sliding groove 14. By increasing the rotation angle of the sieve frame 9, one side of the sieve frame 9 is raised and the other side is lowered, which makes it easier to pour out all the coarse sample in the sieve frame 9 from the lower side.

[0028] A screw rod 16 is threadedly connected above the arc-shaped hole 13, and a threaded hole adapted to the screw rod 16 is provided on the sieve plate 92.

[0029] like Figure 1 As shown, by turning screw 16, one end of screw 16 is inserted into the threaded hole of screen plate 92, so that the position of screen frame 9 is fixed, thereby ensuring that screen frame 9 will not rotate with drum 4 when drum 4 rotates.

[0030] The sealing cover 8 includes an inner cover 81 and an outer cover 82, which form a sealed chamber, and the chamber is also filled with sound-absorbing cotton 43.

[0031] like Figure 1 As shown, the inner cover 81 is also made of polyurethane rubber. The inner cover 81, the outer cover 82 and the sound-absorbing cotton 43 further enhance the sound insulation effect of the feeding port 7 and reduce noise leakage from the feeding port 7. At the same time, in order to improve the sealing performance of the sealing cover 8, a sealing gasket can be installed on the outer periphery of the feeding port 7 so that the outer cover 82 is in close contact with the feeding port 7.

[0032] The feed port 7 is fixedly connected to the screw rod 17 around its perimeter, and the outer cover 82 is provided with mounting holes that match the screw rod 17 around its perimeter. The outer cover 82 is provided with a handle 18.

[0033] like Figure 2 As shown, by installing the mounting hole inside the screw 17 and then installing the locking nut on the screw 17, the sealing cover 8 can be detachably installed on the feed port 7. The handle 18 is for opening and closing the sealing cover 8.

[0034] Operating principle: Open the sealing cover 8 with handle 18, and put a certain amount of coarse aggregate and steel balls into the drum 4 through the feeding port. Then, lock the sealing cover 8 and the feeding port 7 with screw 17 to ensure that the inside of the drum 4 is sealed. At this time, fix the screen frame 9 in the initial position with screw 16 (to prevent the screen frame 9 from moving when the drum 4 rotates). Start the gearbox 2, and control the drum 4 to rotate around the rotating shaft 6 (the speed meets the test standard). During the test, the coarse aggregate and steel balls in the drum 4 rotate with the drum 4 and continuously collide and rub against each other: Since the inner cylinder 41 is made of polyurethane rubber, it can reduce the hard impact of the aggregate colliding with the cylinder wall and reduce noise; the sound-absorbing cotton 43 between the inner cylinder 41 and the outer cylinder 42, and the sound-absorbing cotton 43 in the sealing cover 8 further absorb the internal noise and reduce the noise transmission. Close the gearbox 2 to stop the drum 4 from rotating, open the sealing cover 8 and take out the steel balls; drive the drum 4 to rotate again, so that the feeding port 7 faces downward, and pour the material (the worn aggregate) in the drum 4 into the screen frame 9 below; loosen Open the screw 16, hold the handle 15 and drive the roller 12 to move back and forth along the arc hole 13, which drives the screen frame 9 to swing along the rotating shaft 6, so that the aggregate in the screen frame 9 passes through the arc screen 91 for screening (fine aggregate falls into the lower collection plate, and coarse aggregate remains in the screen 91); if it is necessary to pour out the coarse aggregate, move the roller 12 out from the arc hole 13 through the sliding groove 14, adjust the angle of the screen frame 9 so that the coarse aggregate is poured out from one side of the screen frame 9; finally, clean the coarse aggregate, dry it and weigh it, and calculate the wear rate of the sample (wear rate = (mass before test - mass after test) / mass before test × 100%).

[0035] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A Los Angeles wear tester with noise reduction function, comprising a base (1), a gearbox (2) mounted on the base (1), two support frames (3), and a roller (4) controlled to rotate by the gearbox (2). The roller (4) is hollow and is mounted between the two support frames (3). Each support frame (3) is provided with a bearing seat (5). Both ends of the roller (4) are mounted on the corresponding bearing seats (5) via a rotating shaft (6). One end of the rotating shaft (6) on the side closer to the gearbox (2) passes through the bearing seat (5) and is connected to the gearbox (2). The roller (4) is characterized in that: The radial side wall opening of the roller (4) forms a feeding port (7), and a sealing cover (8) is connected to the feeding port (7). The roller (4) includes an inner cylinder (41) and an outer cylinder (42). The inner cylinder (41) is made of polyurethane rubber. The inner cylinder (41) and the outer cylinder (42) form a sealed sound insulation cavity, which is filled with sound-absorbing cotton (43). A screen frame (9) is provided below the roller (4). The two ends of the screen frame (9) are rotatably mounted on the corresponding rotating shaft (6).

2. The Los Angeles abrasion tester with noise reduction function according to claim 1, characterized in that: The sieve frame (9) includes a sieve mesh (91) with an arc-shaped cross-section. The two ends of the sieve mesh (91) are fixedly connected to sieve plates (92). A bearing (10) with a housing is rotatably mounted on the rotating shaft (6). The bottom of the bearing (10) is connected to the sieve plate (92) by bolts.

3. The Los Angeles abrasion tester with noise reduction function according to claim 2, characterized in that: A connecting shaft (11) is threaded onto the sieve plate (92), and a roller (12) is rotatably connected to the connecting shaft (11). One end of the connecting shaft (11) passes through the roller (12) and is connected to a handle (15). An arc-shaped hole (13) is provided on the side wall of the support frame (3) away from the gearbox (2). The roller (12) is set in the arc-shaped hole (13). By changing the position of the roller (12) in the arc-shaped hole (13), the sieve frame (9) can be rotated by a certain angle.

4. The Los Angeles abrasion tester with noise reduction function according to claim 3, characterized in that: A sliding groove (14) is provided on one side of the support frame (3) that provides the arc-shaped hole (13), and the sliding groove (14) is connected to the arc-shaped hole (13).

5. A Los Angeles abrasion tester with noise reduction function according to claim 4, characterized in that: A screw rod (16) is threadedly connected above the arc-shaped hole (13), and a threaded hole adapted to the screw rod (16) is provided on the sieve plate (92).

6. The Los Angeles abrasion tester with noise reduction function according to claim 1, characterized in that: The sealing cover (8) includes an inner cover (81) and an outer cover (82), which together form a sealed chamber, which is also filled with sound-absorbing cotton (43).

7. A Los Angeles abrasion tester with noise reduction function according to claim 6, characterized in that: The feed port (7) is fixedly connected to the second screw (17) around its perimeter, and the outer cover (82) is provided with mounting holes that match the second screw (17) around its perimeter. The outer cover (82) is provided with a handle (18).

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