Undersize chute of raw coal classifying screen

Abstract

The utility model relates to the technical field of coal separation, and discloses an undersize chute of a raw coal classifying screen, which comprises a central column and a spiral chute arranged on the central column, the spiral chute is spirally wound on the central column, a thread adjusting ring is mounted on the central column in a threaded manner, and a sliding ring is mounted on the central column in a sliding manner. The outer circle of the center column is sleeved with a buffer spring, the buffer spring is distributed between the threaded adjusting ring and the sliding ring, the upper end of the buffer spring is fixedly connected with the bottom face of the sliding ring, and the threaded adjusting ring and the sliding ring are both distributed at the position close to the conveying tail end of the spiral chute. According to the utility model, the buffer spring is used for buffering the impact force on the lower chute main body, so that the lower chute main body of a fixed structure is prevented from being easily damaged due to long-term impact force in use, and the effect of prolonging the service life of the lower chute main body is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal sorting, in particular to an under-screen chute of a raw coal grading screen. Background Art

[0002] A spiral chute is a commonly used device in mineral processing and beneficiation, primarily for sorting and recovering fine-grained materials. Minerals are slowly fed into the chute from the top. Under the influence of gravity, the materials slide down the chute's spiral channel, experiencing the combined effects of centrifugal force, gravity, and water flow. Due to the varying specific gravities of different minerals, they are separated within the chute according to their specific gravity.

[0003] At present, the downflow chute at the end of the spiral chute is connected to the chute body by welding or other fixing methods. This structure is relatively simple, but there are some defects in use. When the material contains harder particles, the material hits the downflow chute under the drive of the water flow, which may cause the chute body to wear or break. The downflow chute with a fixed structure cannot buffer the force of the material and the water flow, affecting its service life.

[0004] Therefore, we propose an under-screen chute for a raw coal grading screen. Utility Model Content

[0005] The utility model mainly solves the above technical problems and provides an under-screen chute of a raw coal grading screen.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solution: an under-screen chute of a raw coal grading screen, comprising a central column and a spiral chute arranged on the central column, wherein the spiral chute is spirally wound on the central column. During the raw coal grading screening, water flows along with the raw coal through the spiral chute from top to bottom. The raw coal material will be affected by the spiral structure of the spiral chute and will rotate and slide downward along the spiral chute under the action of its own gravity and water flow. Larger materials will usually slide and be distributed in the middle of the end of the spiral chute. On the contrary, smaller materials will be distributed on both sides of the end of the spiral chute.

[0007] A threaded adjustment ring is threadedly mounted on the center column, and a sliding ring is slidably mounted on the center column. A buffer spring is sleeved on the outer circumference of the center column. The buffer spring is distributed between the threaded adjustment ring and the sliding ring. The upper end of the buffer spring is fixedly connected to the bottom surface of the sliding ring. The threaded adjustment ring and the sliding ring are both distributed near the conveying end of the spiral chute. A supporting plate is provided on the outer side of the sliding ring, and a T-shaped mounting groove is opened on the top surface of the supporting plate from the outside to the inside.

[0008] The under-screen chute of the raw coal grading screen also includes a lower chute assembly detachably mounted on the support plate;

[0009] The lower chute assembly includes a lower chute body, in which a plurality of baffle plates are fixedly installed, the plurality of baffle plates divide the lower chute body into a plurality of screening cavities, and a plurality of discharge ports are formed through the outer side surface of the lower chute body, and the plurality of discharge ports are connected to the plurality of screening cavities;

[0010] A flow guide component is provided on one side of the baffle plate close to the spiral chute.

[0011] Preferably, the inner side surface of the lower chute body is provided with a socket portion whose structure is compatible with the center column structure, and the bottom surface of the lower chute body is provided with an installation slider whose structure is compatible with the installation groove structure. The lower chute body is slidably installed on the support plate through the cooperation of the installation slider and the installation groove.

[0012] Preferably, the guide assembly includes a flexible connection part and an arc-shaped guide plate. The flexible connection part is fixedly spliced ​​on the side of the baffle plate close to the spiral chute, and the arc-shaped guide plate is fixedly spliced ​​on the end of the flexible connection part away from the baffle plate. The flexible connection part is provided to facilitate the control of the adjustment angle of the arc-shaped guide plate.

[0013] Preferably, when the lower chute body is mounted on the support plate, the flexible connection portion and the arc-shaped guide plate are distributed inside the end of the spiral chute.

[0014] Preferably, a plurality of suction cups are provided on the bottom surface of the arc-shaped guide plate, and the plurality of suction cups are evenly arranged on the bottom surface of the arc-shaped guide plate, and the arc-shaped guide plate is fixed to the inner wall surface of the end of the spiral chute by being adsorbed by the provided suction cups.

[0015] Beneficial effects

[0016] The utility model provides an under-screen chute for a raw coal grading screen. It has the following beneficial effects:

[0017] (1) The under-screen chute of the raw coal grading screen supports the lower chute assembly through the support plate. When the raw coal is rushed into the lower chute body along with the water flow, the lower chute body is prone to generate impact inertia. The impact inertia of the lower chute body acts on the support plate, and the support plate finally transmits the impact force to the buffer spring. The buffer spring buffers the impact force of the lower chute body, thereby preventing the fixed structure of the lower chute body from being easily damaged by the impact force during long-term use, thereby achieving the effect of increasing the service life of the lower chute body.

[0018] (2) In the under-screen chute of the raw coal grading screen, when the main body of the under-screen chute is installed on the support plate, the flexible connection part and the arc-shaped guide plate are distributed inside the end of the spiral chute. The flexible connection part is provided to facilitate the control of the adjustment angle of the arc-shaped guide plate, and the distribution angle of the arc-shaped guide plate can be conveniently adjusted. By freely adjusting the position distribution of the arc-shaped guide plate, the movement trajectory of the raw coal during the sorting process, the sorting efficiency and precision control can be quickly controlled.

[0019] (3) The under-screen chute of the raw coal grading screen is fixed to the inner wall surface of the end of the spiral chute by the suction cup with the arc guide plate. At the same time, when the spiral chute is screening the raw coal, water flows along with the raw coal through the spiral chute. When the water flows and contacts the suction cup, the interaction force between the water molecules and the suction cup is enhanced, thereby increasing the adsorption force of the suction cup, achieving the effect of making the suction cup with the arc guide plate stably distributed at the designated position. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only exemplary, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0021] The structures, proportions, sizes, etc. disclosed in this specification are intended only to complement the contents disclosed in the specification and to facilitate understanding and reading by persons familiar with the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in sizes that do not affect the efficacy and objectives of the present invention shall still fall within the scope of the technical contents disclosed in the present invention.

[0022] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the utility model;

[0023] Figure 2 This is a schematic diagram of the support plate position structure of the utility model;

[0024] Figure 3 This is a schematic diagram of the three-dimensional structure of the lower chute assembly of the utility model;

[0025] Figure 4 This is a schematic diagram of the planar structure of the arc-shaped guide plate of the present utility model.

[0026] Legend:

[0027] 1. Center column; 2. Spiral chute; 3. Threaded adjustment ring; 4. Sliding ring; 5. Support plate; 500. Mounting groove; 6. Buffer spring; 7. Lower chute assembly; 700. Lower chute body; 701. Socket connection; 702. Baffle plate; 703. Flexible connection; 704. Arc guide plate; 705. Mounting slider; 706. Discharge port; 714. Suction cup. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the 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.

[0029] Example 1:

[0030] A chute under the screen of a raw coal grading screen, such as Figure 1 As shown, it includes a central column 1 and a spiral chute 2 provided on the central column 1. The spiral chute 2 is spirally wound on the central column 1. During the raw coal classification and screening, water flows along with the raw coal from top to bottom through the spiral chute 2. The raw coal material will be affected by the spiral structure of the spiral chute 2 and will rotate and slide downward along the spiral chute 2 under the action of its own gravity and water flow. Larger materials will usually slide to the middle of the end of the spiral chute 2. On the contrary, smaller materials will be distributed on both sides of the end of the spiral chute 2.

[0031] Further, such as Figure 2 As shown, a threaded adjustment ring 3 is threadedly mounted on the center column 1, and a sliding ring 4 is slidably mounted on the center column 1. A buffer spring 6 is sleeved on the outer circumference of the center column 1, wherein the buffer spring 6 is distributed between the threaded adjustment ring 3 and the sliding ring 4, and the upper end of the buffer spring 6 is fixedly connected to the bottom surface of the sliding ring 4. The threaded adjustment ring 3 and the sliding ring 4 are both distributed near the conveying end of the spiral chute 2. A support plate 5 is provided on the outer side of the sliding ring 4, and a T-shaped mounting groove 500 is opened on the top surface of the support plate 5 from the outside to the inside;

[0032] Furthermore, the under-screen chute of the raw coal grading screen further includes a lower chute assembly 7 detachably mounted on the support plate 5;

[0033] like Figure 3As shown, the lower chute assembly 7 includes a lower chute body 700, the inner side surface of the lower chute body 700 is provided with a sleeve portion 701 whose structure is compatible with the structure of the central column 1, and the bottom surface of the lower chute body 700 is provided with a mounting slider 705 whose structure is compatible with the structure of the mounting groove 500. The lower chute body 700 is slidably installed on the support plate 5 through the cooperation of the mounting slider 705 and the mounting groove 500. When the lower chute body 700 is firmly installed on the support plate 5, the sleeve portion 701 is sleeved with the outer surface of the central column 1. At this time, the lower chute body 700 is distributed on the lower end extension line of the spiral chute 2. The water flowing down along the spiral chute 2 enters the lower chute body 700 after sorting along with the raw coal material;

[0034] Furthermore, multiple groups of baffle plates 702 are fixedly installed in the lower chute body 700, and the multiple groups of baffle plates 702 divide the lower chute body 700 into multiple screening cavities. Multiple discharge ports 706 are opened through the outer side of the lower chute body 700, and the multiple discharge ports 706 are connected to the multiple screening cavities. External pipelines are connected to the discharge ports 706. Water flows from top to bottom along with the raw coal through the spiral chute 2, and the raw coal is screened by the spiral chute 2. Raw coal of different volumes will flow into different screening cavities and finally be discharged outward through the discharge ports 706.

[0035] The supporting plate 5 is provided to support the lower chute assembly 7. When the raw coal rushes into the lower chute body 700 along with the water flow, the lower chute body 700 is prone to generate impact inertia. The impact inertia of the lower chute body 700 acts on the supporting plate 5. Finally, the supporting plate 5 transmits the impact force to the buffer spring 6. The buffer spring 6 buffers the impact force of the lower chute body 700, thereby increasing the service life of the lower chute body 700 and preventing the fixed structure of the lower chute body 700 from being easily damaged by the impact force during long-term use.

[0036] Example 2

[0037] Based on the first embodiment, Figure 3 As shown, a guide assembly is provided on the side of the baffle plate 702 close to the spiral chute 2, and the guide assembly includes a flexible connection part 703 and an arc-shaped guide plate 704. The flexible connection part 703 is fixedly spliced ​​with the side of the baffle plate 702 close to the spiral chute 2, and the arc-shaped guide plate 704 is fixedly spliced ​​at the end of the flexible connection part 703 away from the baffle plate 702. When the lower chute body 700 is installed on the supporting plate 5, the flexible connection part 703 and the arc-shaped guide plate 704 are distributed inside the end of the spiral chute 2. The flexible connection part 703 is provided to facilitate the control of the left and right swing of the arc-shaped guide plate 704, and the distribution angle of the arc-shaped guide plate 704 is conveniently adjusted. By freely adjusting the position distribution of the arc-shaped guide plate 704, the movement trajectory of the raw coal during the sorting process, the sorting efficiency and the precision control can be quickly controlled;

[0038] Further, such as Figure 4 As shown, the bottom surface of the arc-shaped guide plate 704 is provided with a plurality of suction cups 714, and the plurality of suction cups 714 are evenly arranged on the bottom surface of the arc-shaped guide plate 704. The arc-shaped guide plate 704 is adsorbed and fixed on the inner wall surface of the end of the spiral chute 2 by the provided suction cups 714. At the same time, when the spiral chute 2 is screening the raw coal, the water flows along with the raw coal through the spiral chute 2. When the water flows in contact with the suction cups 714, the interaction force between the water molecules and the suction cups 714 is enhanced, thereby increasing the adsorption force of the suction cups 714, so that the suction cups 714 and the arc-shaped guide plate 704 are firmly distributed at the designated position.

[0039] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A chute under the screen of a raw coal grading screen, comprising a central column (1) and a spiral chute (2) arranged on the central column (1), wherein the spiral chute (2) is spirally wound on the central column (1). During the raw coal grading screening, water flows along with the raw coal from top to bottom through the spiral chute (2). The raw coal material is affected by the spiral structure of the spiral chute (2) and rotates and slides downward along the spiral chute (2) under the action of the water flow at its own gravity. The larger material usually slides and is distributed in the middle of the end of the spiral chute (2). On the contrary, the smaller material is distributed on both sides of the end of the spiral chute (2). Its characteristics are: A threaded adjustment ring (3) is threadedly mounted on the center column (1), and a sliding ring (4) is slidably mounted on the center column (1). A buffer spring (6) is sleeved on the outer circumference of the center column (1). The buffer spring (6) is distributed between the threaded adjustment ring (3) and the sliding ring (4). The upper end of the buffer spring (6) is fixedly connected to the bottom surface of the sliding ring (4). The threaded adjustment ring (3) and the sliding ring (4) are both distributed near the conveying end of the spiral chute (2). A supporting plate (5) is provided on the outer side surface of the sliding ring (4), and a T-shaped mounting groove (500) is opened on the top surface of the supporting plate (5) from the outside to the inside. The under-screen chute of the raw coal grading screen further comprises a lower chute assembly (7) detachably mounted on the support plate (5); The lower chute assembly (7) includes a lower chute body (700), wherein a plurality of baffle plates (702) are fixedly installed in the lower chute body (700), wherein the plurality of baffle plates (702) divide the lower chute body (700) into a plurality of screening cavities, and a plurality of discharge ports (706) are formed through the outer side surface of the lower chute body (700), and the plurality of discharge ports (706) are connected to the plurality of screening cavities; A flow guide assembly is provided on one side of the baffle plate (702) close to the spiral chute (2).

2. The under-screen chute of the raw coal grading screen according to claim 1, characterized in that: The inner side surface of the lower chute body (700) is provided with a sleeve portion (701) whose structure is compatible with the structure of the central column (1), and the bottom surface of the lower chute body (700) is provided with a mounting slide (705) whose structure is compatible with the structure of the mounting groove (500). The lower chute body (700) is slidably mounted on the support plate (5) through the cooperation between the mounting slide (705) and the mounting groove (500).

3. The under-screen chute of the raw coal grading screen according to claim 1, characterized in that: The guide assembly comprises a flexible connection portion (703) and an arc-shaped guide plate (704), wherein the flexible connection portion (703) is fixedly spliced ​​on a side of the baffle plate (702) close to the spiral chute (2), and the arc-shaped guide plate (704) is fixedly spliced ​​on an end of the flexible connection portion (703) away from the baffle plate (702).

4. The under-screen chute of the raw coal grading screen according to claim 3, characterized in that: When the lower chute body (700) is installed on the supporting plate (5), the flexible connection part (703) and the arc-shaped guide plate (704) are distributed inside the end of the spiral chute (2).

5. The under-screen chute of the raw coal grading screen according to claim 3, characterized in that: The bottom surface of the arc-shaped guide plate (704) is provided with a plurality of suction cups (714), and the plurality of suction cups (714) are evenly arranged on the bottom surface of the arc-shaped guide plate (704).

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