Arc-shaped sand discharging valve, automatic sand adding device and vertical grinding machine

Abstract

The utility model discloses an arc-shaped sand discharging valve, an automatic sand adding device and a vertical grinding miller, the arc-shaped sand discharging valve comprises an arc-shaped connecting pipe (22) and an arc-shaped valve plate (25) arranged at the discharging end of the arc-shaped connecting pipe (22), the arc-shaped valve plate (25) is driven by a driving mechanism to rotate by an angle, an inner edge arc surface is arranged on the inner side of the arc-shaped valve plate (25), and the arc-shaped connecting pipe (22) is connected with the arc-shaped valve plate (25). An arc-shaped end face (221) is arranged at the discharging end of the arc-shaped connecting pipe (22), and the inner edge arc face and the arc-shaped end face (221) are matched to form a sealing pair, so that the working stability and sealing performance in a high-hardness medium environment are met, the phenomenon that a valve is stuck is prevented, the stability of equipment is improved, and the service life of the equipment is prolonged. And the manual cut-off valve (3) is arranged on the pipeline (5) between the sand adding tank (1) and the arc-shaped sand discharging valve and is used for dealing with the condition of overhauling or the abnormal condition of the arc-shaped sand discharging valve.

Description

Technical Field

[0001] The utility model relates to the technical field of mineral processing, and more particularly to an arc-shaped sand release valve, an automatic sand adding device and a vertical grinding machine. Background Art

[0002] In the mineral processing process, raw ore is usually crushed to obtain small particles. The small particles are then ground to obtain coarse powder, which is then further ground to obtain micron-level ultrafine powder. The grinding of ultrafine powder is generally achieved using a vertical mill. During the grinding process, grinding media needs to be regularly and quantitatively added to the vertical mill through a feeding device for mixed grinding. The feeding device includes a sand feeding tank and a control valve. The sand feeding tank stores the grinding media and is connected to the vertical mill. The control valve is used to open or close the passage between the sand feeding tank and the vertical mill to put the grinding media into operation.

[0003] Grinding media are usually highly wear-resistant spherical particles of different diameters such as zirconium-aluminum composite balls, ceramic balls, alumina balls, and zirconium silicate balls. They are characterized by high hardness and small particles. Therefore, ordinary wear-resistant shut-off valves, such as ball valves, gate valves, and globe valves, are used as control valves. The problem of valve jamming is easy to occur during the opening or closing process of the valve. Moreover, the use of the above-mentioned valves or manual feeding methods cannot accurately control the feed amount, which can easily lead to problems with slurry concentration and particle size that are unqualified, and even cause overflow accidents in the vertical grinding mill. Utility Model Content

[0004] In response to the above defects or improvement needs of the prior art, the utility model provides an arc-shaped sand release valve, an automatic sand adding device and a vertical grinder, which meet the stability and quantitative release requirements of the vertical grinder when using high-hardness grinding media.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, an arc-shaped sand discharge valve for a vertical grinding machine is provided, comprising an arc-shaped connecting pipe and an arc-shaped valve plate arranged at the discharge end of the arc-shaped connecting pipe, the arc-shaped valve plate is driven to rotate by a driving mechanism, an inner edge arc surface is arranged on the inner side of the arc-shaped valve plate, and an arc-shaped end surface is arranged at the discharge end of the arc-shaped connecting pipe, and the inner edge arc surface and the arc-shaped end surface cooperate to form a sealing pair.

[0006] During operation, the bottom of the arc-shaped pipe is sealed by the arc-shaped valve plate. When sand needs to be released, the driving mechanism drives the arc-shaped valve plate to rotate, and the grinding medium falls from the discharge end of the arc-shaped pipe. The blocking area of the discharge end of the arc-shaped pipe is adjusted by adjusting the rotation angle of the arc-shaped valve plate, thereby realizing the control of the release rate of the grinding medium. After the sand is released, the arc-shaped valve plate returns to seal the discharge end of the arc-shaped pipe. Since the inner edge arc surface of the arc-shaped valve plate and the arc end surface of the discharge end of the arc-shaped pipe cooperate to form a sealing pair, it can effectively prevent the grinding medium with higher hardness from getting stuck in the sand release valve, thereby realizing a smooth, controllable and anti-blocking sand release function.

[0007] Furthermore, the arc-shaped pipe discharge end and the arc-shaped valve plate are arranged in a box body, which can protect the sealing pair. At the same time, the box body can collect the grinding medium leaked during the opening and closing of the arc-shaped valve, so that it can smoothly enter the vertical grinding machine.

[0008] Furthermore, an arc-shaped sealing shaft is rotatably connected in the box body, the driving mechanism is an angular stroke electric actuator, the end of the arc-shaped sealing shaft is axially connected to the angular stroke electric actuator, a valve plate fixing part is fixed on the arc-shaped sealing shaft, and the arc-shaped valve plate is fixed on the valve plate fixing part.

[0009] Furthermore, the curvature of the arc-shaped valve plate is greater than the curvature of the arc-shaped end surface, so that the arc-shaped valve plate can completely cover the arc-shaped end surface, and the falling rate of the grinding medium can be gradually adjusted from the maximum to zero.

[0010] Furthermore, the side of the arc valve plate corresponding to the inner edge arc surface is the outer edge arc surface, the vertical distance between the outer edge arc surface and the axis of the arc sealing shaft is the rotation radius of the arc valve plate, and the vertical distance between the inner wall of the box and the axis of the arc sealing shaft is greater than the rotation radius, so as to prevent the arc valve plate from interfering with the inner wall of the box during rotation.

[0011] Furthermore, the valve plate fixing member is a hollow flat plate structure, which reduces the weight of the valve plate fixing member and the overall weight of the movable part of the valve, and the angular stroke electric actuator adjusts the arc valve plate faster.

[0012] Furthermore, the arc-shaped connecting pipe includes a connected arc segment and a straight segment, the straight segment extends into the box body, and the arc-shaped end surface is arranged at the end of the straight segment. The combination of the arc segment and the straight segment facilitates the transition from the bottom of the sand adding tank on the side of the vertical grinder to the arc-shaped sand discharge valve and pipeline.

[0013] According to a second aspect of the utility model, an automatic sand adding device is provided, comprising the arc-shaped sand release valve and a sand adding tank suspended by an independent suspension weighing device, wherein the sand adding tank stores grinding media, and the bottom of the sand adding tank is connected to the vertical grinding mill through a pipeline, the arc-shaped sand release valve is arranged on the pipeline, and further comprising a manual shut-off valve, wherein the manual shut-off valve is arranged on the pipeline between the sand adding tank and the arc-shaped sand release valve. When the arc-shaped sand release valve or the vertical grinding mill needs to be inspected and repaired, the manual shut-off valve can be closed. When the arc-shaped sand release valve malfunctions and cannot be closed, the manual shut-off valve can cut off the grinding media in the sand adding tank from falling, thereby preventing the vertical grinding mill from overloading.

[0014] Furthermore, the independent suspension weighing device includes a suspension weighing module and an auxiliary suspension module. The suspension weighing module and the auxiliary suspension module are evenly distributed circumferentially on the outside of the sand adding tank. The two are cooperated to suspend the sand adding tank, which can prevent the sand adding tank from falling when an abnormality occurs in the suspension weighing module.

[0015] Furthermore, the lower part of the box is connected to the vertical grinding machine through the pipeline, and the arc segment transitions from the manual shut-off valve to the inclined arc sand release valve to prevent the grinding medium from being blocked in the pipeline and valve.

[0016] According to a third aspect of the present utility model, a vertical grinding machine is provided, which has the automatic sand adding device.

[0017] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0018] (1) The utility model provides an arc-shaped sand release valve. The internal design of the arc-shaped sand release valve meets the stability and sealing performance of working in a high-hardness medium environment, ensuring that it can work normally even when using high-hardness grinding media such as zirconium-aluminum composite beads, and the valve will not get stuck, thereby improving the stability of the equipment.

[0019] (2) The utility model provides an arc-shaped sand release valve, which is driven by an angular stroke electric actuator to ensure sufficient driving power and stable and continuous valve operation. By controlling the angular stroke electric actuator, the arc-shaped valve plate is driven to rotate to different angles, and the grinding medium can be added to the vertical grinder in a timely and quantitative manner, and the grinding medium adding rate can be adjusted to ensure the long-term stable operation of the vertical grinder equipment.

[0020] (3) The utility model provides an automatic sand adding device, in which a manual shut-off valve is arranged above the arc-shaped sand releasing valve, which is not easy to get stuck, thereby avoiding the need to empty the sand adding tank when the arc-shaped sand releasing valve is repaired, reducing the labor intensity and workload of workers. At the same time, when the arc-shaped sand releasing valve accidentally fails, the sand adding tank can be manually closed to avoid the occurrence of overload of the vertical grinding machine.

[0021] (4) The utility model provides an automatic sand adding device, which adopts a combination of a weighing device and an independent suspension device to suspend and monitor the weight of the sand adding tank, and can accurately record and control the amount of material added. The use of the independent suspension device can prevent the sand adding tank from falling or deviating when an abnormality occurs in the weighing device.

[0022] (5) The utility model provides a vertical grinding machine, which can use an automatic sand adding device to quantitatively add grinding media according to grinding requirements. An arc-shaped sand release valve and a manual shut-off valve are provided on the feeding pipe. The arc-shaped sand release valve can adjust the valve opening to control the addition rate of the grinding media. The manual shut-off valve is used when the interior of the grinding machine is to be inspected or when the arc-shaped sand release valve fails. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural diagram of a vertical grinding machine;

[0024] Figure 2 It is a cross-sectional view of a closed state of an arc-shaped sand release valve;

[0025] Figure 3 It is a cross-sectional view of an arc-shaped sand release valve in an open state;

[0026] Figure 4 It is a front view of an arc-shaped sand release valve;

[0027] Figure 5 This is the assembly drawing of the arc-shaped sealed shaft and the angular stroke electric actuator;

[0028] Figure 6 It is a cross-sectional view of the arc-shaped sealing shaft and the arc-shaped valve plate;

[0029] Figure 7 It is a side view of the valve plate fixing member and the curved valve plate;

[0030] Figure 8 It is a front view of the sand adding tank and the independent hanging weighing device;

[0031] Figure 9 This is a top view of the sand adding tank and the independently suspended weighing device.

[0032] In all the drawings, the same figure marks represent the same technical features, specifically: 1. Sand adding tank; 2. Arc-shaped sand discharge valve; 3. Manual shut-off valve; 5. Pipeline; 41. Weighing device; 42. Independent suspension; 11. Tank cover; 21. Box body; 22. Arc-shaped connecting pipe; 23. Arc-shaped sealing shaft; 24. Angular stroke electric actuator; 25. Arc-shaped valve plate; 26. Valve plate fixing part; 221. Arc-shaped end face. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0034] like Figure 1-Figure 5 As shown, this embodiment provides an automatic sand adding device including a sand adding tank 1, an arc-shaped sand release valve 2, a manual shut-off valve 3, and an independently suspended weighing device. The bottom of the sand adding tank 1 is connected to the vertical grinding mill via a pipe 5. The arc-shaped sand release valve 2 is arranged on the pipe 5 and releases the grinding medium to the vertical grinding mill by cutting or connecting the pipe 5. The manual shut-off valve 3 is arranged on the pipe 5 between the sand adding tank 1 and the arc-shaped sand release valve 2. When the valve is closed, the grinding medium in the manual shut-off valve 3 is smoothly discharged into the vertical grinding mill, eliminating the phenomenon of the manual shut-off valve 3 getting stuck. When the arc-shaped sand release valve 2 fails or requires maintenance, there is no need to empty the sand adding tank 1. Only the manual shut-off valve 3 needs to be closed to avoid overloading the vertical grinding mill. Furthermore, multiple independently suspended weighing devices are arranged around the side of the sand adding tank 1 for hoisting. The independently suspended weighing devices can detect the overall weight of the sand adding tank 1 and thus monitor the quality of the grinding medium input. Furthermore, the arc-shaped sand release valve 2 includes an arc-shaped valve plate 25 arranged in the arc-shaped connecting pipe 22. The driving mechanism drives the arc-shaped valve plate 25 to adjust the opening and closing angle, which can meet the stability and sealing requirements of working in a high-hardness medium environment and is not prone to jamming and leakage of grinding media.

[0035] Furthermore, if Figures 1-6As shown, an arc-shaped sand-releasing valve is applied to the automatic sand-feeding device. The arc-shaped sand-releasing valve 2 includes an arc-shaped sealing shaft 23 rotatably connected to a housing 21. The driving mechanism is an angular stroke electric actuator 24 fixed to the housing 21. The end of the arc-shaped sealing shaft 23 is axially connected to the angular stroke electric actuator 24. A valve plate fixing member 26 is fixedly provided on the arc-shaped sealing shaft 23, and an arc-shaped valve plate 25 is fixedly provided at the end of the valve plate fixing member 26. The lower portion of the housing 21 is connected to the vertical grinding mill through a pipe 5, and the upper end is connected to the manual shut-off valve 3 through an arc-shaped pipe 22. The arc-shaped pipe 22 includes a connected arc segment and a straight segment. The straight segment extends into the housing 21, and an arc-shaped end face 221 is provided at the end of the straight segment. The arc segment is used to transition from the manual shut-off valve 3 to the inclined arc-shaped sand-releasing valve 2. Furthermore, the lower end of the arc-shaped connecting pipe 22 is provided with an arc-shaped end surface 221, and the side of the arc-shaped valve plate 25 close to the arc-shaped sealing shaft 23 is defined as the inner edge arc surface, and the other side is the outer edge arc surface. The vertical distance between the outer edge arc surface and the axis of the arc-shaped sealing shaft 23 is the rotation radius of the arc-shaped valve plate 25. The vertical distance between the inner wall of the box body 21 and the axis of the arc-shaped sealing shaft 23 is greater than the rotation radius, which can prevent interference with the inner wall of the box body 21 during rotation. The inner edge arc surface and the arc end surface 221 cooperate to form a sealing pair.

[0036] Furthermore, the movable angle of the arc-shaped valve plate 25 from completely covering the discharge end of the arc-shaped connecting pipe 22 to the fully open state is the maximum rotation angle. Preferably, the maximum rotation angle is 60°.

[0037] Furthermore, when the arc-shaped valve plate 25 completely covers the discharge end of the arc-shaped connecting pipe 22 , the angle bisector of the arc-shaped valve plate 25 should coincide with the axis of the straight line segment of the arc-shaped connecting pipe 22 .

[0038] Preferably, the curvature of the arc-shaped valve plate 25 is set to be slightly larger than the curvature of the arc-shaped end face 221, and the valve plate fixing part 26 adopts a hollow flat plate structure, one end of which is fixed to the arc-shaped sealing shaft 23, and the other end is fixed to the inner edge arc surface. The valve plate fixing part 26 and the inner edge arc surface form an A-type structure. The hollow structure can reduce the overall weight, and the angular stroke electric actuator 24 drives the arc-shaped valve plate 25 more flexibly and quickly.

[0039] The working principle of the arc-shaped sand release valve 2 is as follows: when the arc-shaped sand release valve 2 is closed, the arc-shaped valve plate 25 completely covers the arc-shaped end surface 221, and the discharge end of the arc-shaped pipe 22 is in a sealed state. The grinding medium is confined within the sand release tank and the arc-shaped pipe 22 and cannot fall into the vertical grinding mill. When the angular stroke electric actuator 24 drives the arc-shaped sand release valve 2 to rotate to the maximum rotation angle, the discharge end of the arc-shaped pipe 22 is completely opened, and the grinding medium falls into the vertical grinding mill through the arc-shaped pipe 22. When the arc-shaped sand release valve 2 needs to be closed, the angular stroke electric actuator 24 is reversed, driving the arc-shaped valve plate 25 to cover the discharge end of the arc-shaped pipe 22, and the grinding medium feeding process is interrupted. The coordinated design of the arc-shaped end surface 221 and the arc-shaped valve plate 25 in the present invention can not only ensure the sealing of the grinding medium in the sand adding tank during operation and storage, but also ensure that the angular stroke electric actuator 24 has sufficient driving power, and can operate stably and long-term under high-hardness grinding medium working conditions.

[0040] Furthermore, the curvature of the arc-shaped valve plate 25 needs to be designed in combination with the particle size of the grinding medium and the caliber of the sand discharge pipe interface, so as to ensure that the grinding medium will not leak when the arc-shaped sand discharge valve 2 is closed, and to ensure that the arc-shaped sand discharge valve 2 opens and closes without obstruction and opens and closes in place.

[0041] Furthermore, the independent suspension weighing device includes a suspension weighing module 41 and an auxiliary suspension module 42. The suspension weighing module 41 and the auxiliary suspension module 42 are respectively evenly distributed circumferentially on the outside of the sand adding tank 1. Both are used to suspend the sand adding tank 1. The suspension weighing module 41 detects the change in the weight of the sand adding tank 1 when the grinding medium is added, thereby accurately monitoring the amount of grinding medium added. When the suspension weighing module 41 is damaged, the auxiliary suspension module 42 prevents the sand adding tank 1 from falling or deviating. The sand adding tank 1 is also provided with a tank cover 11, which is opened when sand needs to be added to the sand adding tank and is closed at other times to prevent the grinding medium from leaking out or foreign matter from falling into the sand adding tank 1.

[0042] Furthermore, an automatic sand adding device is applied to a vertical grinding mill, which uses the automatic sand adding device to add grinding media in a quantitative and constant rate. The bottom of the sand adding tank 1 is connected to a manual shut-off valve 3 and an arc-shaped sand release valve 2 in sequence through a pipe 5. The bottom of the pipe 5 is connected to the feed port of the vertical grinding mill. The manual shut-off valve 3 is used to prevent the vertical grinding mill from overloading.

[0043] Preferably, the automatic sand adding device is arranged above the feed inlet and located at the side or top of the vertical mill, so that the grinding medium can be smoothly added into the vertical mill through the pipe 5 under the action of gravity.

[0044] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An arc-shaped sand release valve, characterized in that: The invention comprises an arc-shaped connecting pipe (22) and an arc-shaped valve plate (25) provided at the discharge end of the arc-shaped connecting pipe (22); the arc-shaped valve plate (25) is driven to rotate by a driving mechanism; an inner edge arc surface is provided on the inner side of the arc-shaped valve plate (25); an arc-shaped end surface (221) is provided at the discharge end of the arc-shaped connecting pipe (22); the inner edge arc surface and the arc-shaped end surface (221) cooperate to form a sealing pair.

2. The arc-shaped sand release valve according to claim 1, characterized in that: The discharge end of the arc-shaped pipe (22) and the arc-shaped valve plate (25) are arranged in the box body (21).

3. The arc-shaped sand release valve according to claim 2, characterized in that: An arc-shaped sealing shaft (23) is rotatably connected in the box body (21), the driving mechanism is an angular stroke electric actuator (24), the end of the arc-shaped sealing shaft (23) is axially connected to the angular stroke electric actuator (24), a valve plate fixing member (26) is fixedly provided on the arc-shaped sealing shaft (23), and the arc-shaped valve plate (25) is fixedly provided on the valve plate fixing member (26).

4. The arc-shaped sand release valve according to claim 1, characterized in that: The curvature of the arc-shaped valve plate (25) is greater than the curvature of the arc-shaped end surface (221).

5. The arc-shaped sand release valve according to claim 3, characterized in that: The side of the arc valve plate (25) corresponding to the inner edge arc surface is the outer edge arc surface, the vertical distance between the outer edge arc surface and the axis of the arc sealing shaft (23) is the rotation radius of the arc valve plate (25), and the vertical distance between the inner wall of the box body (21) and the axis of the arc sealing shaft (23) is greater than the rotation radius.

6. The arc-shaped sand release valve according to claim 3, characterized in that: The valve plate fixing member (26) is a hollow flat plate structure.

7. The arc-shaped sand release valve according to any one of claims 2, 3 or 5, characterized in that: The arc-shaped connecting pipe (22) comprises a connected arc segment and a straight segment, the straight segment extends into the box body (21), and the arc-shaped end surface (221) is provided at the end of the straight segment.

8. An automatic sand adding device, comprising an arc-shaped sand release valve according to any one of claims 1 to 7, and a sand adding tank (1) suspended by an independent suspension weighing device, wherein the sand adding tank (1) stores grinding media, the bottom of the sand adding tank (1) is connected to a vertical grinding machine through a pipe (5), and the arc-shaped sand release valve is arranged on the pipe (5), characterized in that: It also comprises a manual shut-off valve (3), which is arranged on the pipeline (5) between the sand adding tank (1) and the arc-shaped sand releasing valve.

9. The automatic sand adding device according to claim 8, characterized in that: The independent suspension weighing device comprises a suspension weighing module (41) and an auxiliary suspension module (42), and the suspension weighing module (41) and the auxiliary suspension module (42) are respectively and evenly distributed circumferentially outside the sand adding tank (1).

10. A vertical grinding machine, characterized in that: The invention has the automatic sand adding device according to claim 8 or 9.

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