A doctor centrifuge residual filter cake thickness measuring device

Abstract

This utility model relates to the field of centrifuge technology and discloses a device for measuring the thickness of residual filter cake in a scraper centrifuge. It includes a scraper body, a lifting cylinder barrel installed inside the scraper body, a lifting cylinder piston rod at the top of the lifting cylinder barrel, and an inner cylinder sleeve fitted around the outer side of the lifting cylinder barrel. The inner cylinder sleeve is rotatably connected to the inner wall of the scraper body through several bearings. This utility model, by incorporating a lifting cylinder barrel and a lifting cylinder piston rod within the scraper body, and connecting a bottom-side pull rope displacement sensor to a rotating gear through a second connecting rope, measures the rotation of the rotating gear. This allows for real-time detection of the scraper's lifting and rotational displacement. Even in the event of equipment failure, the user can quickly locate the scraping stop point and scrape from there, saving time and making the amount of scraped material controllable, thus facilitating subsequent packaging.

Description

Technical Field

[0001] This utility model relates to the field of centrifuge technology, specifically to a device for measuring the thickness of residual filter cake in a scraper centrifuge. Background Technology

[0002] In vertical scraper centrifuges, to prevent the scraper from hitting the inner wall of the inner drum or the filter cloth during scraping, a gap of 8-10mm is usually left between the scraper blade and the inner wall of the inner drum to protect the inner wall or filter cloth from damage. However, after each scraping, a certain thickness of filter cake layer will remain on the drum wall. The material remaining on the inner wall of the inner drum needs to be removed manually, which is time-consuming, labor-intensive, and inefficient. Using a scraper to remove the material is much more convenient.

[0003] The residual filter cake thickness detection in existing traditional scraper centrifuges mostly adopts a discrete position detection method using proximity switches. Its working principle is to indirectly determine the scraping status of the scraper by triggering the switch signal through mechanical limit. Specifically, the proximity switch can only detect the fixed position of the scraper's lifting (up / down) and rotation (left / middle / right), and cannot monitor the continuous movement trajectory of the scraper in real time. This will lead to a large deviation in the judgment of scraping thickness, affecting the removal of the filter cake layer. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a residual filter cake thickness measuring device for scraper centrifuges. This solves the problem that most traditional scraper centrifuges use discrete position detection methods with proximity switches for residual filter cake thickness detection. These methods work by using mechanical limit switches to trigger switch signals, indirectly determining the scraping status of the scraper. Specifically, the proximity switch can only detect the fixed positions of the scraper's lifting (up / down) and rotation (left / middle / right), and cannot monitor the continuous movement trajectory of the scraper in real time. This leads to significant deviations in the determination of scraping thickness, affecting the removal of the filter cake layer.

[0005] This utility model provides the following technical solution: a device for measuring the thickness of residual filter cake in a scraper centrifuge, including a scraper body, a lifting cylinder barrel installed inside the scraper body, and a lifting cylinder piston rod provided at the top of the lifting cylinder barrel;

[0006] An inner cylinder sleeve is fitted around the outer side of the lifting cylinder barrel. The inner cylinder sleeve is rotatably connected to the inner wall of the scraper outer body through several bearings. A toothed ring is also fixed on the inner cylinder sleeve. A side wall groove is opened at the top of the side of the inner cylinder sleeve. A connecting slider is fixed at the top of the side of the lifting cylinder barrel. A top side pull rope displacement sensor is provided at the top of the scraper outer body. The top side pull rope displacement sensor is connected to the connecting slider through a first connecting pull rope. A rotary cylinder barrel is provided at the bottom of the side of the scraper outer body. A rotary cylinder piston rod is provided at the end of the rotary cylinder barrel. A rotating toothed rod is provided at the end of the rotary cylinder piston rod. The rotating toothed rod meshes with the toothed ring for transmission.

[0007] Preferred technical solution 1: A bottom pull rope displacement sensor is provided on the side of the scraper body, and the bottom pull rope displacement sensor is connected to the rotating gear through a second connecting pull rope.

[0008] Preferred technical solution 2: A left and right proximity switch for the scraper is provided on the outer side of the scraper body, and an upper proximity switch and a lower proximity switch for the scraper are also provided on the side of the scraper body.

[0009] Preferred technical solution 3: A rotating chamber is provided on the side of the bottom end of the scraper body, and the rotating chamber is connected to the scraper body.

[0010] Preferred technical solution four: The rotating rack and the rotary cylinder piston rod are both installed inside the rotary chamber.

[0011] This solution enables a more stable meshing transmission between the rotating rack and the ring gear.

[0012] Preferred technical solution five: The upper proximity switch of the scraper is located at the top side of the scraper body, and the lower proximity switch of the scraper is located at the bottom side of the scraper body.

[0013] This solution makes it more convenient for users to turn the scraper on and off.

[0014] Compared with the prior art, this utility model provides a device for measuring the thickness of residual filter cake in a scraper centrifuge, which has the following advantages:

[0015] (1) This utility model has a lifting cylinder barrel and a lifting cylinder piston rod installed in the outer body of the scraper. The top pull rope displacement sensor is connected to the connecting slider on the side of the lifting cylinder barrel through the first connecting pull rope. The top pull rope displacement sensor can measure the lifting amount of the scraper installed on the piston rod of the lifting cylinder. The bottom pull rope displacement sensor is connected to the rotating gear through the second connecting pull rope. The rotating gear meshes with the gear ring for transmission. Thus, the bottom pull rope displacement sensor measures the rotation amount of the rotating gear. In this way, the lifting and rotation displacement of the scraper can be detected in real time. Even when the equipment fails / power is interrupted, the user can quickly find the scraping stop point and scrape the material from the stop point, which saves more time and makes the amount of scraper chips controllable, which is more convenient for subsequent packaging. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0017] Figure 2 This is a schematic diagram of the internal cross-section of the structure of this utility model;

[0018] Figure 3 For the present utility model Figure 2 Enlarged structural view of the inner cylinder liner;

[0019] Figure 4 For the present utility model Figure 2 Enlarged view of the structure of the rotating gear.

[0020] In the diagram: 1. Scraper body; 2. Lifting cylinder barrel; 3. Lifting cylinder piston rod; 4. Inner cylinder sleeve; 5. Bearing; 6. Gear ring; 7. Side wall groove; 8. Connecting slider; 9. Top side pull rope displacement sensor; 10. First connecting pull rope; 11. Rotary cylinder barrel; 12. Rotary cylinder piston rod; 13. Rotating gear; 14. Bottom side pull rope displacement sensor; 15. Second connecting pull rope; 16. Scraper left and right proximity switches; 17. Scraper upper position proximity switch; 18. Scraper lower position proximity switch. Detailed Implementation

[0021] Please see Figure 1-4 ,

[0022] Example 1: A device for measuring the thickness of residual filter cake in a scraper centrifuge, comprising a scraper body 1, a lifting cylinder 2 installed inside the scraper body 1, and a lifting cylinder piston rod 3 provided at the top of the lifting cylinder 2.

[0023] An inner cylinder sleeve 4 is fitted on the outer side of the lifting cylinder barrel 2. The inner cylinder sleeve 4 is rotatably connected to the inner wall of the scraper outer body 1 through a number of bearings 5. A toothed ring 6 is also fixed on the inner cylinder sleeve 4. A side wall sliding groove 7 is opened at the top of the side of the inner cylinder sleeve 4. A connecting slider 8 is fixed at the top of the side of the lifting cylinder barrel 2. A top side pull rope displacement sensor 9 is set at the top of the scraper outer body 1. The top side pull rope displacement sensor 9 is connected to the connecting slider 8 through a first connecting pull rope 10. A rotary cylinder barrel 11 is set at the bottom of the side of the scraper outer body 1.

[0024] A rotary cylinder piston rod 12 is provided at the end of the rotary cylinder barrel 11, and a rotating gear 13 is provided at the end of the rotary cylinder piston rod 12. The rotating gear 13 meshes with the gear ring 6 for transmission. A bottom pull rope displacement sensor 14 is provided on the side of the scraper outer body 1. The bottom pull rope displacement sensor 14 is connected to the rotating gear 13 through a second connecting pull rope 15. A scraper left and right proximity switch 16 is provided on the outside of the scraper outer body 1. A scraper upper position proximity switch 17 and a scraper lower position proximity switch 18 are also provided on the side of the scraper outer body 1.

[0025] Example 2: The difference between this example and Example 1 is that a rotating chamber is provided on the side of the bottom end of the scraper body 1, and the rotating chamber is connected to the scraper body 1.

[0026] Example 3: The difference between this example and Example 1 is that the rotating rack 13 and the rotary cylinder piston rod 12 are both installed inside the rotary chamber.

[0027] This makes the meshing transmission between the rotating rack 13 and the gear ring 6 more stable.

[0028] Example 4: The difference between this example and Example 1 is that the upper proximity switch 17 of the scraper is located at the top side of the scraper body 1, and the lower proximity switch 18 of the scraper is located at the bottom side of the scraper body 1.

[0029] This makes it more convenient for users to turn the scraper on and off.

[0030] In this embodiment, since the residual filter cake thickness detection of existing traditional scraper centrifuges mostly adopts the discrete position detection method of proximity switches, its working principle is to indirectly determine the scraping state of the scraper by triggering the switch signal through mechanical limit. Specifically, the proximity switch can only detect the fixed position of the scraper lifting up / down and rotating left / middle / right, and cannot monitor the continuous movement trajectory of the scraper in real time, which will lead to a large deviation in the scraping thickness judgment and affect the removal of the filter cake layer.

[0031] In summary, in specific implementation, a lifting cylinder 2 is installed inside the scraper outer body 1, and a lifting cylinder piston rod 3 is provided at the end of the lifting cylinder 2, so that the lifting cylinder 2 can drive the lifting cylinder piston rod 3 to lift and lower. A connecting slider 8 is provided on the side of the lifting cylinder 2, and a side wall groove 7 is opened on the side wall of the inner cylinder sleeve 4. A top side pull rope displacement sensor 9 is provided at the top of the scraper outer body 1. The top side pull rope displacement sensor 9 is connected to the connecting slider 8 through the first connecting pull rope 10, so that the top side pull rope displacement sensor 9 can obtain the displacement distance of the lifting cylinder 2 by driving the first connecting pull rope 10 through the lifting cylinder 2. The inner cylinder sleeve 4 is rotatably connected to the scraper outer body 1 through the bearing 5, and a toothed ring 6 is fixed at the bottom of the inner cylinder sleeve 4.

[0032] The side of the toothed ring 6 meshes with the rotating toothed rod 13, allowing the inner cylinder sleeve 4 to rotate within the scraper outer body 1. A bottom pull rope displacement sensor 14 is also installed on the scraper outer body 1. The bottom pull rope displacement sensor 14 is connected to the rotating toothed rod 13 via a second connecting pull rope 15. This allows the bottom pull rope displacement sensor 14 to measure the rotation distance of the rotating toothed rod 13 via the second connecting pull rope 15 when the rotating toothed rod 13 rotates, thereby enabling real-time detection of the scraper's lifting and rotational displacement. Even in the event of equipment failure or power outage, the user can quickly locate the scraping stop point and scrape from that point, saving time and making the amount of scraper chips controllable, which is more convenient for subsequent packaging and bagging.

Claims

1. A device for measuring the thickness of residual filter cake in a scraper centrifuge, comprising a scraper body (1), characterized in that: The scraper body (1) is equipped with a lifting cylinder barrel (2), and the top of the lifting cylinder barrel (2) is provided with a lifting cylinder piston rod (3); An inner cylinder sleeve (4) is fitted on the outer side of the lifting cylinder barrel (2). The inner cylinder sleeve (4) is rotatably connected to the inner wall of the scraper outer body (1) through several bearings (5). A toothed ring (6) is also fixed on the inner cylinder sleeve (4). A side wall groove (7) is opened at the top of the side of the inner cylinder sleeve (4). A connecting slider (8) is fixed at the top of the side of the lifting cylinder barrel (2). A top side pull rope displacement sensor is provided at the top of the scraper outer body (1). The top-side pull rope displacement sensor (9) is connected to the connecting slider (8) by a first connecting pull rope (10). A rotary cylinder barrel (11) is provided at the bottom of the side of the scraper body (1). A rotary cylinder piston rod (12) is provided at the end of the rotary cylinder barrel (11). A rotating gear (13) is provided at the end of the rotary cylinder piston rod (12). The rotating gear (13) meshes with the gear ring (6) for transmission.

2. The device for measuring the thickness of residual filter cake in a scraper centrifuge according to claim 1, characterized in that: The scraper body (1) is provided with a bottom pull rope displacement sensor (14) on its side. The bottom pull rope displacement sensor (14) is connected to the rotating gear (13) by a second connecting pull rope (15).

3. The residual filter cake thickness measuring device for a scraper centrifuge according to claim 2, characterized in that: The outer side of the scraper body (1) is provided with scraper left and right proximity switches (16), and the side of the scraper body (1) is also provided with scraper upper proximity switch (17) and scraper lower proximity switch (18).

4. The residual filter cake thickness measuring device for a scraper centrifuge according to claim 3, characterized in that: A rotating chamber is provided on the side of the bottom end of the scraper body (1), and the rotating chamber is connected to the scraper body (1).

5. The residual filter cake thickness measuring device for a scraper centrifuge according to claim 4, characterized in that: The rotating rack (13) and the rotary cylinder piston rod (12) are both installed inside the rotary chamber.

6. The residual filter cake thickness measuring device for a scraper centrifuge according to claim 5, characterized in that: The upper proximity switch (17) of the scraper is located at the top side of the scraper body (1), and the lower proximity switch (18) of the scraper is located at the bottom side of the scraper body (1).

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