MXPA00013003A - Flowrate control valve for powder and granular material - Google Patents

Abstract

A flowrate control valve for powder and granular materials, comprising a closing plate (5) for closing a lower end of a powder and granular material inlet side pipe (2) inclinedly arranged at a predetermined angle, and edge plates (11) having a predetermined height and provided on three sides except a tip side. The provision of the edge plates (11) having the predetermined height permits accurate flowrate control since powder and granular materials flow out only from the tip side of the closing plate (5) up to a level of the edge plates (11) even when the closing plate (5) is opened.

Description

FLOW CONTROL VALVE FOR FINE MINERALS The present invention relates to a flow control valve for controlling the flow velocity of fine minerals flowing from an upper part to a lower part of a pipe.

ANTECEDENTS OF THE TECHNIQUE Conventionally, when fine iron carbide, cement clinker, coal, iron ore or similar minerals are transferred, it has frequently been practiced to control the flow rate of fine minerals during the transfer. A known example of such a flow control valve for fine minerals is a valve 50 as shown in the longitudinal sectional view of Figure 5. However, because this valve 50 operates by simply opening and closing a rolling plate 51, it is not possible to establish and achieve control of the amount of fine minerals because the fine ores flow from an inlet pipe 52 through not only a lower end of the swing plate 51 but also the side ends of the plate , and the valve 50 is therefore not suitable for use as a control valve to achieve control of the flow rate. Another known example of such a flow control valve for fine minerals in a rotary valve 60 as shown in the longitudinal sectional view of Figure 6. However, because this valve 60 has a rotor 61 which is rotating all the time, the continuous rotation accelerates the wear of the rotating parts and shortens the time of life. Additionally, in case of controlling the flow rate, the rotational speed of the rotor 61 must be controlled in a variable manner, which increases the cost of the equipment. To solve these problems, the applicant of the present invention has previously filed a patent application for an invention which is disclosed in Japanese Patent Application No. 7-223698. A valve 70 for fine minerals disclosed in the aforementioned patent application comprises, as shown in the longitudinal sectional view of Figure 7, a box 71 and a rotary valve body 72 constructed inside the box 71, in that the box 71 has a continuous through passage opening 73 of the pipe installed therein and a downward outlet opening 74 communicating with the inlet opening 73, and the valve body 72 is comprised of a first opening 75 connected in a rotatable slidable manner to the inlet opening 73 and a second opening 76 communicating with the first opening 75 to contact the outlet opening 74. By rotating the valve body 72 using drive means, they are it allows the fine minerals placed in the inlet opening 73 to flow through the first opening 75 to the outlet opening 74 via the second opening 76, the rotation angle of the valve body 72 that is controlled in such a way that a prescribed amount of fine minerals can be discharged. However, because the valve 70 for fine minerals is designed to discharge a controlled amount of fine minerals by applying the angle of repose of fine minerals, the maximum feasible flow rate is short for the diameter of the inlet pipe, requiring a Larger valve for the required amount of discharge. Additionally, the structure of the valve becomes complex. The increased valve size and complex structure leads to an increase in the cost of valve. There is also a possibility of fine mineral deposits to enter between the sliding faces.

REVELATION OF THE INVENTION To solve the above problem, in accordance with the present invention, a flow control valve for fine minerals is provided which comprises an inlet pipe whose lower end is cut at a prescribed angle and a balancing plate installed so as to be can balance to control the flow velocity of fine minerals by controlling the opening degree of the rolling plate and the lower end of the fine ore inlet pipe, where the fine mineral inlet pipe is installed with its center axis inclined at an a greater than the a of repose of the fine minerals, the roll plate, when kept in contact with the lower end of the pipeline. entrance of fine minerals, makes an acute a with the axis center of the fine mineral inlet pipe and the swing plate is supported on an upper end thereof so that the supporting portion is placed above the opening of the lower end of the fine mineral inlet pipe, and a prescribed height cutting plate provided around the first side except for one free end side of the surface of the roll plate that closes the lower end of the inlet pipe. fine minerals. As described above, because the shaft center of the fine ore inlet pipeline is inclined at an a greater than the fine ore's a of repose, the flow of fine ores can be stabilized at a speed smaller as it would be in the case where the center of the shaft was supported around three sides except the free end side of the surface of the swing plate that closes the lower end of the fine mineral input pipe, When the rolling plate is opened, the fine minerals are allowed to flow out only from the free end side of the roll plate at the height of the cutting plate. Accordingly, the flow velocity of fine ores can be controlled by restricting the flow section of fine ores in a predetermined rectangular section. Thus, because a flow control height can be achieved by controlling only the inlet of the slab, an inexpensive flow control valve for fine minerals can be provided that is capable of performing a stable flow control of fine minerals. . Because the support portion, which is the balancing center of the balancing plate, is located above the lower end opening of the fine mineral inlet pipe, no sliding portion is brought into contact with the fine minerals and there is no possibility of fine minerals entering between the sliding faces. Additionally, when the means for opening and closing the roll plate closing the lower end of the fine ore inlet pipe is provided on the rear surface of the roll plate, the flow control of the fine minerals can be achieved without Put the means to open and close the rolling plate in contact with the fine minerals. This can provide a flow control valve for fine minerals in which the opening and closing means prevents wear by maintaining contact with fine minerals.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a view showing a first embodiment according to the present invention, Figure 1 (a) which is a longitudinally sectional view, Figure 1 (b) which is a view taken along line AA, and Figure 1 (c) which is a view taken along the line BB; Figure 2 is a graph showing the flow characteristics of the flow control valve for fine minerals illustrated in Figure 1; Figure 3 is a longitudinally sectional view showing a second embodiment in accordance with the present invention; Figure 4 is a longitudinally sectional view showing a third embodiment in accordance with the present invention; Figure 5 is a longitudinally sectional view showing a flow control valve for fine minerals according to the prior art; Figure 6 is a longitudinally sectional view showing another flow control valve for fine minerals according to the prior art; Figure 7 is a longitudinally sectional view showing still a flow control valve for fine minerals according to the prior art.

BEST WAY TO MAKE THE INVENTION A preferred embodiment of the present invention will be described below with reference to the drawings. Figure 1 is a view showing a first embodiment in accordance with the present invention, Figure 1 (a) which is a longitudinally sectional view, Figure 1 (b) which is a view taken along line AA, and Figure 1 (c) which is a view taken along line B-B. As shown in Figure 1, in this embodiment, a fine ore inlet pipe 2 with a flange 2a is installed in an upper part of a box 1 whose cross section is rectangular, and the flange 2a is connected to a upper tab 1a of box 1 with bolt 3. To a lower flange 1b of box 1 is ü-t -,? * - *. ?-F. connected a fine mineral outlet pipe 4 having a flange 4a at the upper end thereof, the flange 4a of the fine mineral outlet pipe 4 which is connected to a lower flange 1b of the box 1 with pin 3. upper part of the fine mineral outlet pipe 4 is rectangular, and the lower part thereof is circular. The lower end of the fine ore inlet pipe 2 is cut to cross at a prescribed angle to an axis center 'c' of the fine ore inlet pipe 2. In this mode the angle of the crossed axes is approximately 60 degrees. In this modality, a balancing plate 5, which keeps in contact with the lower end of the fine ore inlet pipe 2, makes an acute angle with the center axis of the fine ore inlet pipe 2, and the balancing plate 5 it is supported at its upper end with an arrow 5a rotatably attached to the box 1 such that the supporting portion is placed above the lower end opening of the fine mineral input pipe 2. The other end, which is, the free end of the balancing plate 5 is thus made so that it can be balanced * around the arrow 5a. As described above, the lower end of the fine ore inlet pipe 2 is cut at the prescribed angle, and the balancing plate 5 is kept in contact with the lower end of the fine ore 2 inlet pipe. a free end side at the tip, which allows the fine minerals contained in the fine ore inlet pipe 2 to always flow out of the free end side of the sway plate 5. A support 6 is attached to the rear surface of the swing plate 5m and a link member 7 is connected to the support 6. The linkage member 7 is driven by a pulse motor 10 which is connected via an arrow of mj? igi ^^^^? ^^^^^^^^^^^^^ j? gi? g drive 8, which is supported by a support 1c to casing 1, and a reduction speeds 9. By controlling the rotation angle of the drive motor 10, the balancing plate 5 can be opened at a desired angle. In this embodiment, the drive motor 10 as a means for opening and closing the swing plate 5 is installed on one side of the box 1 to drive the link articulation member 7 connected to the rear surface of the roll plate 5. The character reference 'S' designates a sealing member for the drive shaft 8 installed in the case 1. A cutting plate 11 of prescribed height is provided around three sides except for the free end side of the surface of the shaft. plate roll 5 which is maintained in contact with the inlet pipe fine mineral 2. it is preferable that the height d of the cutting plate 11 is determined such that, as shown in Figural (b), the area sectional of the free end opening section 'e' defined by the balancing plate 5 and the cutting plate 11 on both sides thereof is equal to greater than the internal cross sectional area of the fine mineral input pipe 2 . That is, the construction is such that, during the opening of the plate roll 5, the height of the section of rectangular opening elongated 'e' defined by the plate roll 5 and the cutting plate 11 in both sides of it is increased and, when the joining line of the upper edges of the free end side of the cutting plate 11 leaves the lower end of the fine mineral input pipe 2, the sectional area of the section of opening 'e' becomes equal to greater than the interior transverse sectional area of the fine mineral input pipe 2 and also, after the sectional area of the opening section 'e' exceeds the internal cross sectional area of the pipe of fine mineral input 2, it is possible to measure the flow rate of fine minerals even if the fine minerals flow out on the cutting plate 11 provided in the balancing plate 5. Fixing the height d of the plate -j, - * - "M" '' i ?? fl? Rr -jg-Mif "3» - - - - - "« * - - * -. - ^ - Cut 11 in this way, can be performed to establish the control of the flow velocity of the fine minerals flowing through the entire internal cross section of the fine ore inlet pipe 2. The control valve of flow for fixed minerals V1 is installed in such a way that the complete construction is inclined at a prescribed angle greater than the angle of repose of the fine minerals. In this embodiment, the valve V1 is held at an inclination angle of approximately 60 degrees. This inclination ensures that fine minerals flow at a stable speed. The angle of inclination must be determined according to the type of fine or similar minerals. In accordance with the above fine flow control valve V1 of the first embodiment, the drive motor 10 is driven to rotate the drive shaft 8 which in turn drives the hinge member 7 to open the sway plate 5 up in the desired angle. When the rotation is such that the height of the opening is smaller than the height of the cutting plate 11, the flow of the fine minerals is restricted by the cutting plate 11 attached to the balancing plate 5, allowing the minerals fines contained in the fine ore inlet pipe 2 flow only through the opening section 'e' on the free end side of the slab 5, thereby achieving accurate flow control of fine minerals. In this case, the relationship between the opening angle of the plate roll 5 and the flow rate of fine ores is substantially proportional as is shown in Figure 2 showing the flow characteristics and flow control stable of fine minerals can thus be achieved. Figure 3 is a longitudinally sectional view showing a second embodiment of the flow control valve for fine minerals. The second mode uses a hydraulic cylinder as the driving means to open and close the swing plate. The same parts as those in the first preceding mode they are designed by the same reference numerals, and explanatory descriptions of such parts will be omitted here. As shown in Figure 3, in the second embodiment also, the fine mineral inlet pipe is rectangular, and the arrow 2a is connected to an upper flange 12a of the box 12 with pin 3. In this embodiment, a The fine ore outlet pipe 13 is directly attached to the bottom of the box 12. The lower end of the fine ore inlet pipe 2 is cut to cross at an angle of about 60 degrees to the center of axis 'c' similarly as in the first preceding modality. In this embodiment also, a balancing plate 14, which is kept in contact with the lower end of the fine ore inlet pipe 2, makes an acute angle with the axis center of the fine ore inlet pipe 2, and the balancing plate 14 is supported at its upper end with an arrow 14a rotatably attached to the box 12 such that the supporting portion is positioned above the lower end inlet of the fine mineral inlet pipe 2. The free end of the balancing plate 14 is thus made to swing around: the arrow 14a. This flow control valve for fine minerals V2 is installed as the complete construction is inclined at a prescribed angle higher than the angle of repose of the mineral flnos. In this embodiment, valve V2 is held at an inclination angle of approximately 45 degrees. The drive means for opening and closing the balancing plate 14 is attached to the rear surface of the balancing plate 14. The driving means comprises a guide rail 15 of L-shaped section fixed to the balancing plate 14, a guide wheel 16 which moves as long as it remains in contact with the balancing plate 14 when guided along the L-shaped section of the guide rail 15, a ^^ M8teaaea * ^^^ - iaiiiiíÉMiÉÉM ^^^ triangular support member 17 which supports the guide wheel 16, an actuating arrow 18 whose end is rotatably connected to the bearing member 17, and a hydraulic or pneumatic cylinder 18 which expands and contracts the drive shaft 18. The reference character 'S' designates the sealing member for the drive shaft 18 installed on the case 12. Accordingly, by controlling the amount of expansion and contraction of the hydraulic cylinder or tire 19, the swing plate 14 can be opened upward to the desired angle. In this embodiment also, the lower end of the fine ore inlet pipe 2 is cut at a prescribed angle, and the swing lever 14 which is kept in contact with the lower end of the fine ore inlet pipe has one side free end at the tip, allowing the fine minerals contained in the fine ore inlet pipe 2 to always flow outward from the free end side of the sway plate 14. The cutting plate 11 attached to all around the three sides except the The free end side of the balancing plate 14 is the same as that disclosed in the preceding first embodiment, and therefore, an explanatory description thereof will not be repeated here. In accordance with the flow control valve for fine minerals V2 of the second embodiment, the hydraulic or pneumatic cylinder 19 is operated to expand or contract the drive shaft 18, which causes the guide wheel 16 to move along of the guide rail 15, thereby opening the balancing plate 14 to a desired angle. At this time, the position in which the guide wheel 16 maintains contact with the swing plate 17 held to swing near its upper end, changes in accordance with the opening angle, but the guide wheel 16 can be accommodated in the displacement since it can be moved along the rail of ; * tm ^ | Mj ÉÉÉÉ guide 15. The function of the cutting plate 11 provided on the balancing plate 14 is the same as that described in the preceding first embodiment, and therefore, an explanatory description thereof will not be repeated here. Figure 4 is a longitudinally sectional view showing a third embodiment of the flow control valve for fine minerals. The construction of the third modality is the same as the previous second modality, the only difference it has is the means of impulsion. In the third embodiment, a drive motor and a chain are used as drive means to open and close the swing plate. The same parts of those in the preceding second mode are designated by the same reference numeral, and explanatory descriptions of such parts will be omitted here. As shown in FIG. 4, in the third mode, the drive means that causes the balancing plate 14 to swing comprises an actuating arrow 20 whose end is rotatably connected to the triangular support member 17 which supports the guide wheel 16 provided on the rear surface of the balancing plate 14, a toothed pinion 21 which is assembled with a threaded portion 20a formed at the other end of the driving shaft, a chain 22 for driving the toothed pinion 21, and a driving motor 23 for driving the chain 22. The toothed pinion 21 is supported by means of a support member not shown. According to the flow control valve for fine minerals V3 of the third embodiment, when the toothed pinion 21 is rotated by the chain 22 when driving the drive motor 23 in a controlled manner, the drive shaft 20, whose threaded portion 20a is assembled with the rotary toothed pinion 21, makes it move to the left or right in Figure 4, so that the swinging plate 14 can be opened at the desired angle. In the third embodiment, similarly as in the first and second embodiments, since the cutting plate 11 provided around the three sides except for the free end side of the balancing plate 14 that allows the fine minerals contained in the pipeline entrance of fine minerals 2 flow out from the free end side of the rolling plate 14, the stable flow control of the fine minerals can be achieved. The drive means for opening and closing the swing plate 5 or 14 of the first to third modes is not limited to the illustrated examples, and other constructions such as one that opens and closes the swing plate on one side of the box 1 or 12 can be used. Additionally, the angle of inclination of the fine ore inlet pipe 2 described in the respective embodiments is not limited to the illustrated examples, but the angle of inclination must be determined conveniently and appropriately according to the type of fine minerals, temperature , pressure and similar. INDUSTRIAL APPLICATION The flow control valve for fine minerals according to the present invention is useful for controlling the flow velocity of fine minerals flowing from a top to a bottom of the pipe. Especially, this flow control valve for fine minerals is conveniently used to control the flow velocity of fine minerals under high temperature and high pressure. ****** ** - * - * - - ^^ ^^^^^^ a ^^^^

Claims (2)

1. The flow control valve for fine minerals that includes a fine mineral inlet pipe whose lower end is cut at an angle 5 requirements and plate installed balancing so that it can swing to control the flow rate of fine mineral to control the degree of opening between the plate roll and the lower end of the inlet pipe mineral fines, wherein the Fine mineral inlet pipe is installed with its inclined shaft certro at an angle greater than the resting angle of the fine minerals. 10 plate rolling when maintains contact with the lower end of the inlet pipe fine ores, makes an acute angle with the center axis of the inlet pipe fine ores and the plate roll is supported at an upper end of the same in such a way that the support portion is placed above the lower end opening of the fine mineral inlet pipe, and a height cutting plate The prescribed end is provided around three sides except for a free end side of the surface of the roll plate which closes the lower end of the fine ore inlet pipe.

2. The flow control valve for fine minerals of claim 1, characterized in that the means for varying the degree of opening of the The balancing plate that can close the lower end of the fine mineral inlet pipe is provided on the rear surface of the roll plate and is driven in such a manner to control the roll plate. 25