A thickener with a small rake that can be driven independently

Abstract

The present invention provides a thickener with an independently driven small rake frame, belonging to the technical field of thickeners. The thickener comprises: a main shaft, a rake frame, a core shaft, and a small rake frame. The main shaft is a hollow pipe. The rake frame is connected to the outer periphery of the main shaft and rotates with the main shaft under the drive of the main shaft drive motor reducer. The core shaft is coaxially installed in the main shaft, and the bottom end of the core shaft extends from the main shaft and is fixedly connected to the small rake frame. One end of the core shaft is connected to the inner wall of the main shaft through a ratchet device, and the end is provided with a core shaft drive motor reducer. The other end of the core shaft is connected to the main shaft through a sliding bearing. When the main shaft rotates under the drive of the main shaft drive motor reducer, the ratchet device drives the core shaft and the small rake frame to rotate in the same direction. When the pressure rake stops working, the core shaft drive motor reducer drives the core shaft to rotate, and the small rake frame rotates with it. The main shaft remains stationary, thereby realizing independent driving of the small rake frame, maintaining the fluidity of the slurry at the center position, and allowing the slurry deposited at the bottom of the thickener to be discharged through a slurry pump, gradually discharging the accumulated sand.

Description

Technical Field

[0001] The present invention relates to the technical field of thickeners, in particular to a thickener with a small rake frame that can be driven independently. Background Art

[0002] Thickeners are widely used in mining, chemical industry, environmental protection and other fields. Their main function is to settle and concentrate the slurry fed into the thickener, so that the bottom mud with high concentration is discharged from the bottom of the thickener, and the clarified water is discharged through the overflow. During the thickener production process, due to the sudden coarsening of the mineral particle size or the sudden increase in concentration contained in the feed slurry, the thickener will be pressed by rakes. Paste thickeners usually do not have a rake function. The above thickener rakes have no processing capacity for the crushed sand, and can only be cleaned by manual shoveling. The labor intensity is high and the workload is particularly large. Pressing rakes will cause the entire production line to stop, causing heavy losses to mining companies.

[0003] The invention patent application with publication number CN112354224A proposes a central transmission concentrator drive device, which discloses that a guide wheel group and a rake lifting cylinder are fixed on the upper part of the reducer housing, a guide groove is set on the guide tube shaft, and the guide wheel of the guide wheel group is located in the guide groove. The rake lifting guide adopts a roller group to complete the rake lifting action. A group of anti-deviation wheel groups are also set at the lower part. The rake lifting guide wheel group and the anti-deviation wheel group together constitute a lifting guide system, which can lift the rake frame when the driving torque exceeds the limit, and has an overload protection function.

[0004] Publication number CN111620419A is a central transmission automatic rake raising and high-efficiency concentrator, which can achieve automatic rake raising through a motor drive device.

[0005] The above patent documents mention different schemes for raising the rake, which belong to high-efficiency thickeners. High-efficiency thickeners generally have an automatic rake raising function, which can continue to operate after the rake frame is raised, but they cannot continue to operate after pressing the rake and discharge the accumulated sand. If the deposition continues to increase, it will eventually be crushed to death; if the sand cannot be discharged by the equipment itself, it can only be cleaned manually. The sand volume of an industrial thickener ranges from hundreds of tons to tens of thousands of tons. The work is extremely difficult, and the manual cleaning efficiency is low. During the cleaning period, the entire mineral processing process must be shut down. The thickener is an important equipment in the main process. Once it is shut down, it will seriously affect the production operation of the mine.

[0006] In view of the above reasons, the present invention proposes a thickener with a small rake frame that can be driven independently. Under the condition of pressure rake, the fluidity of the slurry in the center can still be guaranteed until all the accumulated slurry is discharged. Summary of the Invention

[0007] The purpose of the present invention is to provide a thickener with a small rake that can be driven independently. In the case of rake pressure, the small rake can still be driven to rotate independently, and the stirring effect of the small rake is utilized to ensure the fluidity of the slurry in the center until all the accumulated slurry is discharged.

[0008] The present invention provides a thickener that can be driven by a small rake frame independently, comprising: a main shaft, a rake frame, a core shaft and a small rake frame, the main shaft being a hollow pipe fitting, the rake frame being connected to the outer circumferential surface of the main shaft and being driven by a main shaft driving motor reducer to rotate with the main shaft, the core shaft being coaxially installed in the main shaft, and the bottom end of the core shaft extending from the bottom end of the main shaft and fixedly connected to the small rake frame, one end of the core shaft being transmission-connected to the inner wall of the main shaft by a ratchet device, and a core shaft driving motor reducer being provided at the end, the other end of the core shaft being connected to the main shaft by a sliding bearing, when the main shaft rotates clockwise under the drive of the main shaft driving motor reducer, the core shaft and the small rake frame can be driven to rotate in the same direction by the ratchet device; when the main shaft driving motor reducer stops working due to rake pressing, the core shaft driving motor reducer can drive the core shaft to rotate clockwise, the small rake frame rotates with the core shaft, and the main shaft remains stationary, thereby realizing independent driving of the small rake frame.

[0009] Preferably, the ratchet device comprises a pawl seat, an inner ratchet and a plurality of pawls, one end of the pawl is rotatably mounted on the outer periphery of the pawl seat, and the other end is adapted to interfere with the ratchet groove on the inner ratchet.

[0010] Preferably, the pawl seat is fixedly connected to the outer peripheral surface of the core shaft, and the inner ratchet is fixedly connected to the inner wall of the main shaft.

[0011] Preferably, the pawl seat is integrally connected to the outer peripheral surface of the core shaft, and the inner ratchet is integrally connected to the inner wall of the main shaft.

[0012] Preferably, the inner side of the other end of the pawl is connected to the pawl seat via a spring.

[0013] Preferably, the width of the pawl gradually narrows from one end close to the pawl seat to one end away from the pawl seat, and the pawl is in an arc shape close to the pawl seat.

[0014] Preferably, the number of the pawls is 4 to 8, and they are evenly spaced on the outer circumference of the pawl seat.

[0015] Preferably, the spindle drive motor reducer is arranged at the top end of the spindle, and includes a first motor and a first reducer that are transmission-connected, and the first reducer drives the spindle to rotate through gear transmission or belt transmission.

[0016] Preferably, the core shaft drive motor reducer is arranged at the top or bottom end of the core shaft, including a second motor and a second reducer in transmission connection, and the output end of the second reducer is directly connected to the core shaft through a keyway or a coupling.

[0017] Preferably, the small rake frame is a screw-belt structure that can gradually scoop up and lift the settled sand.

[0018] The technical solution of the present invention connects the main shaft and the core shaft through a ratchet device, and sets a core shaft drive motor reducer at the end of the core shaft which can independently drive the core shaft to rotate. When the thickener is operating normally, the main shaft drive motor reducer drives the main shaft and the rake to rotate, and drives the core shaft and the small rake to rotate in the same direction through the ratchet device, so that the slurry in the thickener is settled and concentrated. When the mineral particle size contained in the feed slurry suddenly becomes coarser or the concentration suddenly increases, causing the thickener to press the rake, the main shaft drive motor reducer stops running, the main shaft and the rake stop rotating, and at this time, the core shaft is driven by the reducer. The driving motor reducer drives the core shaft to continue rotating in the above direction. Since the ratchet device has the characteristic of one-way transmission, the core shaft cannot drive the main shaft to rotate through the ratchet device at this time. The core shaft and the small rake are driven independently to maintain the fluidity of the slurry near the center position, so that the slurry deposited at the bottom of the thickener can be discharged through the slurry pump, and the accumulated sand in the entire thickener is gradually discharged. Finally, all the deposited slurry is discharged from the pool body, so that the thickener can resume normal production, avoiding the occurrence of manual shoveling of ore. The cleaning speed is much faster than manual shoveling, reducing the downtime of the mineral processing plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a structural schematic diagram of the thickener of the present invention;

[0021] Figure 2 This is a cross-sectional view of the main shaft and the core shaft being driven by the ratchet device in the present invention.

[0022] Description of reference numerals:

[0023] 1: Small rake frame; 2: Mandrel; 3: Rake frame; 4: Spindle; 5: Ratchet device; 6: Spindle drive motor reducer; 7: Mandrel drive motor reducer; 8: Pawl seat; 9: Spring; 10: Pawl; 11: Inner ratchet. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0027] like Figure 1 、 2As shown, the present invention proposes a thickener with an independently driven small rake frame, comprising: a main shaft 4, a rake frame 3, a core shaft 2 and a small rake frame 1. The main shaft 4 is a hollow pipe. The rake frame 3 is connected to the outer peripheral surface of the main shaft 4 and can rotate with the main shaft 4 driven by the main shaft drive motor reducer 6. The rake frame 3 slowly rotates and scrapes, and the mud deposited at the bottom can be concentrated to the sand discharge port for continuous and intermittent discharge. Fine particles and clarified liquid flow out from the overflow port. The core shaft 2 is coaxially installed in the main shaft 4, and the bottom end of the core shaft 2 extends from the bottom end of the main shaft 4 and is fixedly connected to the small rake frame 1. The upper end outer surface of the core shaft 2 and the inner wall of the main shaft 4 are connected by a ratchet device 5. The top of the core shaft 2 is provided with a core shaft drive motor reducer 7. The lower end outer surface of the core shaft 2 and the inner wall of the main shaft 4 are connected by a sliding bearing. When the main shaft 4 is driven by the main shaft drive motor reducer 6 to rotate clockwise, the core shaft 2 and the small rake frame 1 can be driven to rotate in the same direction through the ratchet device 5; when the main shaft drive is driven by the main shaft drive motor reducer 6, the core shaft 2 and the small rake frame 1 can be driven to rotate in the same direction; when the main shaft drive is driven by the main shaft drive motor reducer 6, the core shaft 2 and the small rake frame 1 can be driven by the ratchet device 5. When the motor reducer 6 stops working, the main shaft 4 and the rake 3 stop rotating, and the core shaft drive motor reducer 7 can drive the core shaft 2 to rotate clockwise, and the small rake 1 rotates with the core shaft 2. Due to the one-way transmission characteristics of the ratchet device 5, the main shaft 4 remains stationary, and the small rake 1 is driven independently. At this time, the fluidity of the slurry near the center position is maintained by the rotation of the small rake 1, so that the slurry deposited at the bottom of the thickener can be discharged through the slurry pump, and the accumulated sand in the entire thickener is gradually discharged, and finally all the deposited slurry is discharged from the pool body.

[0028] Specifically, if Figure 2 As shown, the ratchet device 5 includes a pawl seat 8, an inner ratchet 11, and a plurality of pawls 10, wherein the pawl seat 8 is integrally connected to the outer circumference of the core shaft 2, and the inner ratchet 11 is integrally connected to the inner wall of the main shaft 4. The starting end of the pawl 10 is rotatably mounted on the outer circumference of the pawl seat 8, and the end thereof is adapted to abut against the ratchet groove on the inner ratchet 11. The inner side of the end of the pawl 10 is connected to the pawl seat 8 by a spring 9. The spring 9 is in a compressed state, so that the end of the pawl 10 can be tightly fitted with the groove on the inner wall of the inner ratchet 11. In this embodiment, according to the structural characteristics of the ratchet device 5, only when the main shaft 4 rotates in the clockwise direction will the pawl 10 and the pawl seat 8 drive the core shaft 2 to rotate in the same clockwise direction. When the core shaft 2 rotates clockwise, due to the one-way transmission characteristics of the ratchet device 5, it will not drive the main shaft 4 to rotate clockwise.

[0029] More specifically, the width of the pawl 10 gradually narrows from its starting end to its end, and the starting end of the pawl is arc-shaped. The number of pawls 10 ranges from 4 to 8, evenly spaced around the outer circumference of the pawl seat 8. In this embodiment, the number of pawls 10 is 6, ensuring stable transmission of the ratchet device 5.

[0030] Specifically, the spindle drive motor reducer 6 is arranged at the top of the spindle 4, including a first motor and a first reducer in transmission connection, and the first reducer drives the spindle 4 to rotate through gear transmission or belt transmission. The mandrel drive motor reducer 7 is arranged at the top or bottom end of the mandrel 2. In this embodiment, it is arranged at the top of the mandrel 2, including a second motor and a second reducer in transmission connection, and the output end of the second reducer is directly connected to the top of the mandrel 2 through a keyway or a coupling. Of course, the spindle drive motor reducer 6 and the mandrel drive motor reducer 7 can also be replaced with hydraulic (pneumatic) motor drives, which also fall within the scope of protection of the technical solution of this utility model.

[0031] In this embodiment, the small rake frame 1 is a screw-belt structure that can gradually shovel up and lift the settled sand, which can ensure the fluidity of the bottom deposited slurry. The bottom deposited slurry can be discharged through a slurry pump, and eventually all the deposited slurry is discharged from the pool body, and the thickener resumes normal operation.

[0032] The working principle of the thickener of the present invention is as follows:

[0033] When the thickener is operating normally, the main shaft drive motor reducer 6 drives the main shaft 4 and the rake 3 to rotate clockwise, and drives the core shaft 2 and the small rake 1 to rotate clockwise through the ratchet device 5, so that the slurry in the thickener is settled and concentrated; when the mineral particle size contained in the feed slurry suddenly becomes coarser or the concentration suddenly increases, causing the thickener to press the rake, the main shaft drive motor reducer 6 stops running, the main shaft 4 and the rake 3 stop rotating, at this time, the core shaft drive motor reducer 7 drives the core shaft 2 to continue rotating in the clockwise direction, and the core shaft 2 is driven by the core shaft drive motor reducer 7. Because the ratchet device 5 has the characteristic of one-way transmission, at this time, the core shaft 2 cannot drive the main shaft 4 to rotate through the ratchet device 5, and the core shaft 2 and the small rake frame 1 are driven independently, so as to maintain the fluidity of the slurry near the center position, so that the slurry deposited at the bottom of the thickener can be discharged through the slurry pump, and the accumulated sand in the entire thickener is gradually discharged, and finally all the deposited slurry is discharged from the pool body, so that the thickener can resume normal production, avoiding the occurrence of manual shoveling of ore, and the cleaning speed is much faster than manual shoveling of ore, reducing the downtime of the mineral processing plant.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A thickener with a small rake that can be driven independently, characterized in that: include: The main shaft, the rake frame, the core shaft and the small rake frame, the main shaft is a hollow pipe, the rake frame is connected to the outer peripheral surface of the main shaft, and can rotate with the main shaft under the drive of the main shaft drive motor reducer, the core shaft is coaxially installed in the main shaft, and the bottom end of the core shaft extends from the bottom end of the main shaft and is fixedly connected to the small rake frame, one end of the core shaft is connected to the inner wall of the main shaft through a ratchet device, and a core shaft drive motor reducer is provided at the end, the other end of the core shaft is connected to the main shaft through a sliding bearing, the ratchet device includes a pawl seat, An inner ratchet and multiple pawls, one end of the pawl can be rotatably mounted on the outer periphery of the pawl seat, and the other end is adapted to interfere with the ratchet groove on the inner ratchet. When the main shaft rotates clockwise under the drive of the main shaft drive motor reducer, the core shaft and the small rake frame can be driven to rotate in the same direction through the ratchet device; when the main shaft drive motor reducer stops working due to rake pressure, the core shaft drive motor reducer can drive the core shaft to rotate clockwise, and the small rake frame rotates with the core shaft, and the main shaft remains stationary, thereby realizing independent drive of the small rake frame.

2. The thickener with independently driven small rakes according to claim 1, characterized in that: The pawl seat is fixedly connected to the outer peripheral surface of the core shaft, and the inner ratchet is fixedly connected to the inner wall of the main shaft.

3. The thickener with independently driven small rakes according to claim 2, characterized in that: The pawl seat is integrally connected to the outer peripheral surface of the core shaft, and the inner ratchet is integrally connected to the inner wall of the main shaft.

4. The thickener with independently driven small rakes according to claim 1, characterized in that: The inner side of the other end of the pawl is connected to the pawl seat through a spring.

5. The thickener with independently driven small rakes according to claim 1, characterized in that: The width of the pawl gradually narrows from one end close to the pawl seat to one end away from the pawl seat, and the pawl is in an arc shape close to the pawl seat.

6. The thickener with independently driven small rakes according to claim 1, characterized in that: The number of the pawls is 4 to 8, and the pawls are evenly spaced on the outer periphery of the pawl seat.

7. The thickener with independently driven small rakes according to claim 1, characterized in that: The main shaft drive motor reducer is arranged at the top end of the main shaft, and includes a first motor and a first reducer that are transmission-connected. The first reducer drives the main shaft to rotate through gear transmission or belt transmission.

8. The thickener with independently driven small rakes according to claim 1, characterized in that: The core shaft drive motor reducer is arranged at the top end or the bottom end of the core shaft, and includes a second motor and a second reducer in transmission connection, and the output end of the second reducer is directly connected to the core shaft through a keyway or a coupling.

9. The thickener with independently driven small rakes according to claim 1, characterized in that: The small rake frame is a screw-belt structure that can gradually scoop up and lift the settled sand.

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