An automatic detection device for the material level of a thickening equipment

Abstract

The present invention provides an automatic level detection device for a thickening equipment. The thickening equipment includes a conical thickening tank. A central support is provided at the center of the thickening tank. A thickening unit that can rotate around it is connected to the central support. Above the thickening tank, a pulp conveying truss for conveying pulp is fixed. A level detection mechanism is fixed at a position of the pulp conveying truss close to the edge of the thickening tank. The level detection mechanism includes a vertically arranged driving mechanism. The telescopic rod of the driving mechanism is connected to a level rod. Below the driving mechanism, an annular cleaning pipe is provided. Spray holes are provided on the inner circle of the cleaning pipe. The level rod passes through the cleaning pipe, and scales for marking the level depth are provided on the level rod. The device of the present invention avoids the safety hazards existing in manual measurement, can realize continuous automatic detection of the level, and has high measurement accuracy.

Description

Technical Field

[0001] The present invention belongs to the technical field of pulp concentration and relates to an automatic detection device for the material level of a thickening equipment. Background Art

[0002] The concentration process of minerals or ordinary materials is a key step in the dehydration production operation. For a long time, the material level height of sedimentation has been detected by manual operation or using a sludge level meter. In the manual operation mode, personnel climb onto the edge around the thickening equipment, put a relevant material level rod into the bottom of the thickening tank and then take it out for manual inspection. There are safety risks such as easy slipping and falling into the water, and the inspection efficiency is low. When using a sludge level meter for detection, it has good effects for easily sedimentable materials, such as in water treatment. However, for some minerals during sedimentation, there are problems such as changes in material specific gravity, unclear boundaries between the clarification layer, transition layer, and sedimentation layer, and strong material adhesiveness. In this case, the accuracy and reliability of the detected data will become relatively low, and the continuous stability of production cannot be guaranteed.

[0003] With the enhancement of the people-oriented technology development concept, this long-term mode of relying on manual labor to complete operations or applying imperfect technologies needs to be improved urgently. Summary of the Invention

[0004] The purpose of the present invention is to provide an automatic detection device for the material level of a thickening equipment in view of the problems existing in the prior art, so as to improve the safety problems of manual operation and the low detection accuracy.

[0005] For this reason, the present invention adopts the following technical solutions:

[0006] An automatic detection device for the material level of a thickening equipment, the thickening equipment includes a conical thickening tank, a central support is provided at the center of the thickening tank, a thickening unit that can rotate around it is connected to the central support, a pulp conveying truss for conveying pulp is fixed above the thickening tank, a material level detection mechanism is fixed near the edge of the thickening tank on the pulp conveying truss, the material level detection mechanism includes a vertically arranged driving mechanism, a material level rod is connected to the telescopic rod of the driving mechanism, a ring-shaped cleaning pipe is provided below the driving mechanism, a water spraying hole is provided on the inner circle of the cleaning pipe, the cleaning pipe is connected to a water source through a water supply pipe, a solenoid valve is connected to the water supply pipe, the material level rod passes through the cleaning pipe, and a scale for marking the material level depth is provided on the material level rod.

[0007] Further, a camera is fixed on one side of the material level detection mechanism on the pulp conveying truss, and the camera lens is directly facing the material level rod.

[0008] Further, an annular retaining ring is provided in the thickening tank, the retaining ring is arranged close to the top wall of the thickening tank, and the material level rod is located between the side wall of the thickening tank and the retaining ring.

[0009] Furthermore, an overflow weir is provided at the top edge of the thickener. The level rod is located between the overflow weir and the retaining ring, and the retaining ring is fixed to the overflow weir through a connecting rod. The upper edge of the retaining ring is slightly higher than the upper edge of the overflow weir.

[0010] Furthermore, the detection device further includes a controller, and the controller is respectively connected to the driving mechanism, the solenoid valve and the camera.

[0011] Furthermore, the driving mechanism is an electric cylinder.

[0012] Furthermore, first limiters and second limiters are respectively provided on both sides of the slurry conveying truss corresponding to the outer edge of the thickener, and the first limiters and the second limiters are respectively connected to the controller.

[0013] The beneficial effects of the present invention are as follows: It avoids the potential safety hazards existing in manual measurement, and can realize continuous and automatic detection of the liquid level; after each detection, the cleaning pipe can wash the surface of the level rod, which is convenient for the next detection; the retaining ring can isolate the foam or floating substances on the surface of the slurry in the thickener, etc., preventing the influence on the observation of the level rod, and further ensuring the measurement accuracy; through the controller and the limiters, etc., the automatic operation of the liquid level detection mechanism is realized, effectively saving manpower. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic structural layout diagram of the detection device of the present invention;

[0015] Figure 2 It is a top view of the structure of the thickening equipment of the present invention;

[0016] Figure 3 It is a schematic structural diagram of the liquid level detection mechanism of the present invention;

[0017] Figure 4 It is a schematic structural diagram of the cleaning pipe of the present invention;

[0018] Figure 5 It is a control schematic diagram of the present invention;

[0019] In the figure, 1 - thickener, 2 - central support, 3 - thickening unit, 4 - slurry conveying truss, 5 - overflow weir, 6 - retaining ring, 7 - driving mechanism, 8 - level rod, 9 - cleaning pipe, 10 - spray hole, 11 - water supply pipe, 12 - solenoid valve, 13 - camera, 14 - first limiter, 15 - second limiter, 16 - controller, 17 - connecting rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The technical solution of the present invention will be further described below through specific embodiments.

[0021] As Figures 1-5As shown in the figure, an automatic detection device for the material level of a thickening equipment. The thickening equipment is of an existing structure, which includes a conical thickening tank 1. At the center of the thickening tank 1, there is a central support 2. A thickening unit 3 that can rotate around it is connected to the central support 2. Above the thickening tank 1, there is a pulp conveying truss 4 for conveying pulp. At the top edge of the thickening tank 1, there is an overflow weir 5 for discharging overflow water. The pulp conveying truss 4 is a fixed structure, and a material level detection mechanism is fixed near the edge of the thickening tank 1. The material level detection mechanism includes a vertically arranged driving mechanism 7. The telescopic rod of the driving mechanism 7 is connected to a material level rod 8. Below the driving mechanism 7, there is an annular cleaning pipe 9. The inner circle of the cleaning pipe 9 is provided with water spraying holes 10. The cleaning pipe 9 is connected to a water source through a water supply pipe 11. An electromagnetic valve 12 is connected to the water supply pipe 11. The water supply pipe 11 can adopt a hard material pipe to fix the cleaning pipe 9. The material level rod 8 passes through the cleaning pipe 9, and scales for marking the depth of the material level are arranged on the material level rod 8.

[0022] In the present invention, the driving mechanism 7 is preferably an electric cylinder. The material level rod 8 is cylindrical, and the material, color, etc. should be selected according to the adhesion of the minerals or materials to ensure that the settled materials can adhere. The material can be selected as wood, PVC, etc., and the color can be selected as white with an obvious color difference from the materials. The cleaning pipe 9 can be selected to be configured with a heating device, such as a heat tracing band, which is suitable for preventing freezing during winter production.

[0023] An annular retaining ring 6 is also arranged in the thickening tank 1. The retaining ring 6 is arranged close to the top wall of the thickening tank 1. The material level rod 8 is located between the overflow weir 5 and the retaining ring 6. The retaining ring 6 is fixed to the overflow weir 5 through 2 - 3 connecting rods 17 (as Figure 2 shown). To ensure the blocking effect on foams and floating objects, the upper edge of the retaining ring 6 is slightly higher than the upper edge of the overflow weir 5.

[0024] A camera 13 is fixed on one side of the material level detection mechanism on the pulp conveying truss 4. The camera of the camera 13 is directly facing the material level rod 8. On both sides of the pulp conveying truss 4 corresponding to the outer edge of the thickening tank 1, there are respectively a first limiter 14 (located at point A in Figure 2 and a second limiter 15 (located at point B in Figure 2 ). When the thickening unit 3 passes by, the first limiter 14 and the second limiter 15 can be triggered. To achieve automatic control, the detection device further includes a controller 16. The controller 16 is respectively connected to the driving mechanism 7, the electromagnetic valve 12, the camera 13, the first limiter 14 and the second limiter 15.

[0025] The working principle of the present invention is as follows:

[0026] First of all, the prerequisite for material level detection is: along the running direction of the thickening unit 3 ( Figure 2In the direction indicated by the arrow), when the thickening unit 3 is prohibited from being detected within the circumferential range from point A to point B, it is allowed to be detected within the circumferential range from point B to point A. This is because if the level rod 8 extends downward within the circumferential range from point A to point B, it will affect the forward rotation of the thickening unit 3, while it will not within the circumferential range from point B to point A.

[0027] When level detection is required, the drive mechanism 7 drives the level rod 8 vertically downward through the gap between the retaining ring 6 and the overflow weir 5 into the bottom of the thickening tank 1 according to the set stroke. After staying still for a short period of time, the drive mechanism 7 drives the level rod 8 to slowly rise. When it reaches the set stroke, the camera 13 takes pictures or videos of the material attachment on the level rod 8. After completion, the drive mechanism 7 drives the level rod 8 to continue rising. When it reaches the set stroke, the controller 16 controls the solenoid valve 12 to open, and the cleaning pipe 9 sprays and cleans the material attached to the level rod 8 from top to bottom until the drive mechanism 7 drives the level rod 8 to reach the highest set position and stops. At the same time, the controller 16 located in the background can perform intelligent comparison and analysis on the sampled photos or videos taken by the camera 13, read out the level height, and upload the data information to complete a level detection.

[0028] In addition, the first limiter 14 is located at Figure 2 point A in Figure 2 and the second limiter 15 is located at point B in. After the first limiter 14 and the second limiter 15 are triggered by the thickening unit 3, the controller 16 controls the start and stop of the level detection mechanism according to the trigger signal, that is, when the first limiter 14 is triggered, the level detection mechanism stops, and when the second limiter 15 is triggered, the level detection mechanism starts. When setting the specific positions, the setting point at B can be slightly near the pulp conveying truss 4. The requirement for the setting point at A is that the time required for the thickening unit 3 to run from point B to point A is equal to or greater than the time required for the level detection mechanism to complete a detection, so as to ensure that when the thickening unit 3 runs within the circumferential range from point B to point A, the level detection mechanism can just complete a detection.

Claims

1. An automatic detection device for the material level of a thickening equipment, characterized in that, the thickening equipment includes a conical thickening tank, a central support is provided at the center of the thickening tank, a thickening unit that can rotate around it is connected to the central support, a pulp conveying truss for conveying pulp is fixed above the thickening tank, and a material level detection mechanism is fixed near the edge of the thickening tank on the pulp conveying truss. The material level detection mechanism includes a vertically arranged driving mechanism. The telescopic rod of the driving mechanism is connected to a material level rod that can adhere to the settling material. A circular cleaning pipe is provided below the driving mechanism. Spraying holes are provided on the inner circle of the cleaning pipe. The cleaning pipe is connected to a water source through a water supply pipe. An electromagnetic valve is connected to the water supply pipe. The material level rod passes through the cleaning pipe, and scales for marking the depth of the material level are provided on the material level rod; a camera is fixed on the pulp conveying truss on one side of the material level detection mechanism, and the camera lens is directly facing the material level rod; an annular retaining ring is provided in the thickening tank, and the retaining ring is arranged close to the top wall of the thickening tank; an overflow weir is provided at the top edge of the thickening tank, and the material level rod is located between the overflow weir and the retaining ring. The retaining ring is fixed to the overflow weir through a connecting rod; a controller is further included, and the controller is respectively connected to the driving mechanism, the electromagnetic valve and the camera; first limiters and second limiters are respectively provided on both sides of the pulp conveying truss corresponding to the outer edge of the thickening tank, and the first limiters and the second limiters are respectively connected to the controller.

2. The automatic detection device for the material level of a thickening equipment according to claim 1, characterized in that, the upper edge of the retaining ring is slightly higher than the upper edge of the overflow weir.

3. The automatic detection device for the material level of a thickening equipment according to claim 1, characterized in that, the driving mechanism is an electric cylinder.

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