Metering flow valve

Abstract

The invention belongs to the technical field of flow valves, and discloses a metering flow valve which comprises a flow valve body internally provided with a valve cavity, a feeding pipeline communicated with a stock bin is installed on one side of the flow valve body, an air cylinder is installed on the other side of the flow valve body, and a sealing plug blocking an outlet of the feeding pipeline is installed on a telescopic rod of the air cylinder. The bottom of the flow valve body is provided with a discharging port communicated with the weighing barrel through a discharging pipeline, the top of the flow valve body is provided with an upper ventilation port used as an air supplementing port, and the upper end of the flow valve body is provided with a horizontal sliding cover which is arranged at an inlet of the upper ventilation port in a sliding and blocking mode. The upper end of the flow valve body is provided with a driving mechanism connected with the horizontal sliding cover, and the driving mechanism controls the horizontal sliding cover to slide at the upper end of the flow valve body so as to adjust the size of the air supplementing opening. The flow velocity of materials can be controlled by automatically controlling the size of the air supplementing opening, and then accurate metering is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of flow valves, and in particular relates to a metering flow valve. Background Art

[0002] A metering flow valve is a valve used to accurately control and measure the flow of fluids. An existing large-scale metering flow valve includes a flow valve body with a valve cavity disposed inside. A feed pipe is installed on one side of the flow valve body, so that the two ends of the feed pipe are connected to the valve cavity and a silo with materials respectively. A cylinder is installed on the other end of the flow valve body. A sealing plug for blocking the outlet of the feed pipe is fixed on the telescopic rod of the cylinder. At the same time, a discharge port is provided at the bottom of the flow valve body. The discharge port is connected to a weighing barrel mounted on a weighing sensor through a discharge pipe. An exhaust fan is provided on the weighing barrel. When the exhaust fan is turned on during operation, The cylinder controls the sealing plug to open and the exhaust fan to start, so that the material in the silo can pass through the feed pipe, valve cavity and discharge pipe in turn and enter the weighing bucket. The weighing sensor senses the weight change of the weighing bucket in real time. When the material in the weighing bucket reaches or is about to reach the required amount, the weighing sensor transmits a signal to the controller to control the start of the cylinder, so that the sealing plug blocks the outlet of the feed pipe again, thereby realizing the metering control of the material. On this basis, an air supply port will also be set on the top of the flow valve body to ensure the normal circulation of the material.

[0003] However, during the use of the above-mentioned metering flow valve, the flow rate of the material is relatively constant. If the flow rate of the material is high, the final weighing result is difficult to control and the accuracy is poor; if the flow rate of the material is low, it takes more time and the weighing efficiency is too low. Therefore, it is necessary to improve it. Summary of the invention

[0004] The purpose of the present invention is to provide a metering flow valve to solve the above problems existing in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A metering flow valve comprises a flow valve body with a valve cavity arranged inside, a feed pipe connected to a silo is installed on one side of the flow valve body, a cylinder is installed on the other side of the flow valve body, a sealing plug for blocking the outlet of the feed pipe is installed on the telescopic rod of the cylinder, a discharge port connected to a weighing bucket through a discharge pipe is arranged at the bottom of the flow valve body, an upper air vent used as an air supply port is arranged at the top of the flow valve body, a horizontal sliding cover slidably blocking the inlet of the upper air vent is arranged at the upper end of the flow valve body, and a driving mechanism connected to the horizontal sliding cover is installed at the upper end of the flow valve body for adjusting the size of the air supply port by controlling the sliding of the horizontal sliding cover on the upper end of the flow valve body through the driving mechanism.

[0007] As a preferred technical solution in the present invention, the driving mechanism includes a driving motor and a screw. The driving motor is installed at the upper end of the flow valve body, the screw is extended along the sliding direction of the horizontal sliding cover, and the motor shaft of the driving motor is connected to one end of the screw; the upper end of the horizontal sliding cover is connected to a vertical connecting plate, and the screw is threadedly connected to the vertical connecting plate.

[0008] As a preferred technical solution in the present invention, the motor shaft of the driving motor is connected to one end of the screw through a coupling; two vertical positioning plates arranged parallel to the vertical connecting plate are fixedly installed on the upper end of the flow valve body, and the two vertical positioning plates are respectively located on both sides of the horizontal sliding cover, and the two ends of the screw are rotatably connected to the two vertical positioning plates through bearings.

[0009] As a preferred technical solution in the present invention, a sliding rod arranged parallel to the screw rod is connected between the two vertical positioning plates, and the vertical connecting plate is slidably connected to the sliding rod via a linear bearing.

[0010] As a preferred technical solution in the present invention, a horizontal limit plate arranged above the horizontal sliding cover is fixed to the lower end of the vertical connecting plate, at least two vertical limit columns are fixed to the upper end of the horizontal sliding cover, at least two limit holes are opened on the horizontal limit plate, and the upper part of the vertical limit column is matched and inserted into the limit hole.

[0011] As a preferred technical solution in the present invention, at least two positioning bolts are installed on the horizontal limit plate, and the screw rods of the positioning bolts are outer-circuited with compression springs, and the two ends of the compression springs are respectively in contact with the horizontal limit plate and the horizontal sliding cover.

[0012] As a preferred technical solution in the present invention, a filter cover is installed at the upper end of the flow valve body, and a horizontal sliding cover is arranged in the filter cover.

[0013] As a preferred technical solution in the present invention, a plurality of feed pipes are installed on one side of the flow valve body, and the feed port of each feed pipe is connected to a silo respectively; a cylinder is installed on the other side of the flow valve body corresponding to each feed pipe.

[0014] Beneficial effect: The present invention can control the sliding of the horizontal slide cover on the upper end of the flow valve body through the driving mechanism to adjust the size of the air supply port, and the driving mechanism can be electrically connected to the weighing sensor through the controller. Through the weighing of the weighing sensor, as the required material becomes less and less, the driving mechanism can control the horizontal slide cover to slide slowly, which can solve the problem of only quantitative air supply that cannot be adjusted during use, and can automatically control the air supply port to gradually become larger. When the material in the weighing bucket is about to reach the required amount, the amount of material is reduced by enlarging the air supply port, so that the material in the weighing bucket can be more accurately stabilized at the required amount, while meeting high efficiency, making the metering control more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0016] Figure 2 It is a front view of the present invention;

[0017] Figure 3 This is a schematic diagram of the structure of the present invention when the filter cover is not installed;

[0018] Figure 4 for Figure 3 Enlarged schematic diagram of part A.

[0019] In the figure: 1-flow valve body; 101-upper air vent; 2-feed pipe; 3-cylinder; 4-sealing plug; 5-horizontal slide cover; 6-drive motor; 7-screw; 8-vertical connecting plate; 9-vertical positioning plate; 10-slide rod; 11-horizontal limit plate; 12-positioning bolt; 13-compression spring; 14-filter cover. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0021] Example:

[0022] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, this embodiment provides a metering flow valve, including a flow valve body 1 with a valve cavity arranged inside (it should be noted that the end face of the flow valve body 1 in the accompanying drawings is provided with an opening in order to better observe the internal structure, and the opening is actually blocked, such as the opening at the front end of the flow valve body 1 in the main view, which is actually blocked), a feed pipe 2 connected to the silo is installed on one side of the flow valve body 1, a cylinder 3 is installed on the other side of the flow valve body 1, and a sealing plug 4 that blocks the outlet of the feed pipe 2 is installed on the telescopic rod of the cylinder 3, and a discharge port connected to the weighing bucket through the discharge pipe is opened at the bottom of the flow valve body 1. The above structure is the same as the prior art and does not require any modification. Detailed description, on the basis of the above structure, an upper air vent 101 used as an air supply port is opened on the top of the flow valve body 1. When the metering flow valve starts to work, air will always enter the valve cavity through the upper air vent 101 to ensure the stability of material flow. At the same time, a horizontal sliding cover 5 is provided at the upper end of the flow valve body 1 for slidingly blocking the inlet of the upper air vent 101. A driving mechanism connected to the horizontal sliding cover 5 is installed at the upper end of the flow valve body 1 to control the sliding of the horizontal sliding cover 5 on the upper end of the flow valve body 1 through the driving mechanism to adjust the size of the air supply port. By adjusting the size of the air supply port, the amount of air flow can be controlled, thereby controlling the flow rate of the material.

[0023] The present invention can control the sliding of the horizontal sliding cover 5 on the upper end of the flow valve body 1 through a driving mechanism to adjust the size of the air supply port, and the driving mechanism can be electrically connected to the weighing sensor through a controller. Through the weighing of the weighing sensor, as the required material becomes less and less, the driving mechanism can control the horizontal sliding cover 5 to slide slowly, and the problem of only quantitative air supply that cannot be adjusted during use can be solved. Moreover, the air supply port can be automatically controlled to become larger, and then when the material in the weighing bucket is about to reach the required amount, the amount of material is reduced by enlarging the air supply port, and then the material in the weighing bucket can be more accurately stabilized at the required amount, while meeting high efficiency, making the metering control more accurate.

[0024] As a preferred implementation scheme in this embodiment, it needs to be further explained that the driving mechanism includes a driving motor 6 and a screw 7. The driving motor 6 is installed at the upper end of the flow valve body 1, and the screw 7 is extended along the sliding direction of the horizontal sliding cover 5, and the screw 7 is arranged above the horizontal sliding cover 5. The motor shaft of the driving motor 6 is connected to one end of the screw 7, so that the screw 7 can be controlled to rotate by the driving motor 6; the upper end of the horizontal sliding cover 5 is connected with a vertical connecting plate 8, and the screw 7 is threadedly connected to the vertical connecting plate 8. After starting the driving motor 6, the driving motor 6 can drive the screw 7 to rotate, and the vertical connecting plate 8 is driven to move when the screw 7 rotates. When the vertical connecting plate 8 moves, it is limited by the horizontal sliding cover 5 (the horizontal sliding cover 5 can only slide on the upper end of the flow valve body 1, so the vertical connecting plate 8 connected to the horizontal sliding cover can only slide), so that the vertical connecting plate 8 can only slide, and the sliding vertical connecting plate 8 can also drive the horizontal sliding cover 5 to slide stably, thereby accurately controlling the size of the air supply port.

[0025] As a preferred implementation scheme in this embodiment, it needs to be further explained that the motor shaft of the drive motor 6 is connected to one end of the screw 7 through a coupling; two vertical positioning plates 9 arranged parallel to the vertical connecting plate 8 are fixedly installed on the upper end of the flow valve body 1, and the two vertical positioning plates 9 are respectively located on both sides of the horizontal sliding cover 5, leaving enough space for the sliding of the horizontal sliding cover 5, and the two ends of the screw 7 are rotatably connected to the two vertical positioning plates 9 through bearings to ensure the stability of the screw 7.

[0026] As a preferred implementation scheme in this embodiment, it needs to be further explained that a sliding rod 10 arranged parallel to the screw rod 7 is connected between the two vertical positioning plates 9, and the vertical connecting plate 8 is slidably connected to the sliding rod 10 through a linear bearing, so that the vertical connecting plate 8 can only slide, and then when the screw rod 7 rotates, the vertical connecting plate 8 can be stably slid to slide, and the sliding of the vertical connecting plate 8 can also drive the horizontal sliding cover 5 to slide stably.

[0027] As a preferred implementation scheme in this embodiment, it needs to be further explained that the lower end of the vertical connecting plate 8 is fixed with a horizontal limit plate 11 arranged above the horizontal sliding cover 5, and the upper end of the horizontal sliding cover 5 is fixed with at least two vertical limit columns. The horizontal limit plate 11 is provided with at least two limit holes, and the upper part of the vertical limit column is matched and inserted into the limit hole, so as to realize the rapid loading and unloading of the equipment. The vertical limit column is driven to move by the horizontal limit plate 11, and the horizontal sliding cover 5 can also be controlled to slide stably.

[0028] As a preferred implementation scheme in this embodiment, it needs to be further explained that at least two positioning bolts 12 are installed on the horizontal limit plate 11, and the screw outer sleeve of the positioning bolt 12 is connected with a compression spring 13. The two ends of the compression spring 13 are respectively abutted against the horizontal limit plate 11 and the horizontal sliding cover 5. The compression spring 1 gives the horizontal sliding cover 5 a downward pressing force, so that the horizontal sliding cover 5 fits tightly on the top of the flow valve body 1, which can avoid the gap between the horizontal sliding cover 5 and the flow valve body 1 and cause air circulation, thereby making the control of the size of the air supply port more precise, and also making the metering control more precise.

[0029] As a preferred implementation scheme in this embodiment, it needs to be further explained that a filter cover 14 is installed at the upper end of the flow valve body 1, and the horizontal sliding cover 5 is arranged in the filter cover 14. The upper end of the filter cover 14 is a mesh structure with multiple air holes, and then the mesh structure at the upper end of the filter cover 14 can be used to filter impurities simply, so as to prevent dust and other impurities from falling into the valve cavity, and then prevent dust and other impurities from mixing into the material. Of course, it needs to be further explained that in practice, the side of the filter cover 14 can also be a mesh structure with multiple air holes, which will not affect the actual operation of the equipment. Therefore, such a structure is not a limitation of the filter cover 14 structure in the present invention, and can be adjusted according to actual conditions.

[0030] As a preferred implementation scheme in this embodiment, it needs to be further explained that a plurality of feed pipes 2 are installed on one side of the flow valve body 1, and the feed port of each feed pipe 2 is connected to a silo; a cylinder 3 is installed on the other side of the flow valve body 1 corresponding to each feed pipe 2, so that a variety of materials can be weighed, such as pigments, to improve practicality, and also improve work efficiency and reduce equipment costs when weighing multiple materials. It should be noted that in practice, when the number of silos is relatively large, resulting in a relatively large volume of the flow valve body 1 itself, a partition can be set inside the flow valve body 1 according to actual conditions, so as to divide the internal space of the flow valve body 1 into two spaces or multiple spaces, thereby simply dividing the space where the logistics fall inside the flow valve body 1.

[0031] It should be noted that, preferably, the sealing plug 4 is a conical structure, that is, the diameter of the sealing plug 4 gradually decreases from one end connected to the cylinder 3 to the other end, and the diameter of one end of the sealing plug 4 is the largest, and the diameter of one end of the sealing plug 4 is larger than the inner diameter of the outlet of the feed pipe 2, so that when the sealing plug 4 blocks the outlet of the feed pipe 2, it can be better sealed. Further explained, the sealing plug 4 includes a metal part and a rubber plug. The metal part is a conical structure and is connected to the piston rod of the cylinder 3. The rubber plug is installed at one end of the metal part close to the feed pipe 2. When sealing, the metal part squeezes the rubber plug, which can better achieve the sealing of the outlet of the feed pipe 2.

[0032] In order to further improve the sealing effect, two design solutions are provided below to further illustrate the structure of the sealing plug 4. Both design solutions allow the sealing plug 4 to be tilted at a certain angle, so that the sealing plug 4 can better seal with the outlet of the feed pipe 2, as described below:

[0033] 1. It should be noted that, preferably, the piston rod of the cylinder 3 can be connected to the sealing plug through a coupling.

[0034] 4 are connected, which can ensure the control effect of the cylinder 3 on the sealing plug 4. At the same time, the sealing plug 4 has a certain flexibility through the coupling. Therefore, when the accuracy of the sealing plug 4 and / or the feeding pipeline 2 deviates, the sealing plug 4 can be adaptively adjusted according to the situation at the outlet of the feeding pipeline 2 to ensure the sealing effect.

[0035] 2. It should be noted that, preferably, the sealing plug 4 can be slidably connected to a screw rod, and the screw rod is connected to the piston rod of the cylinder 3 through a coupling or directly. In practice, limit nuts threadedly connected to the screw rod can be provided at both ends of the sealing plug 4, and the sealing plug 4 can be positioned and adjusted by the limit nuts at both ends of the sealing plug 4, thereby realizing the position adjustment of the sealing plug 4, so that the sealing plug 4 can better achieve sealing cooperation with the feed pipe 2, and a deformable gasket and other structures can be provided between the limit nut and the sealing plug 4 to improve the sealing performance. It should be further noted that when the sealing plug 4 is sleeved on the screw rod, the inner diameter of the center hole of the sealing plug 4 can be slightly larger than the diameter of the screw rod, thereby enabling the sealing plug 4 to be adjusted at a small angle on the screw rod. Through such angle adjustment, when the design accuracy at the outlet of the feed pipe 2 deviates, the sealing plug 4 can be better matched with the outlet of the feed pipe 2, thereby ensuring the sealing effect.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A metering flow valve, comprising a flow valve body (1) with a valve cavity arranged inside, a feed pipe (2) connected to a silo installed on one side of the flow valve body (1), a cylinder (3) installed on the other side of the flow valve body (1), a sealing plug (4) blocking the outlet of the feed pipe (2) installed on the telescopic rod of the cylinder (3), a discharge port connected to a weighing bucket through a discharge pipe is provided at the bottom of the flow valve body (1), an upper air vent (101) used as an air supply port is provided at the top of the flow valve body (1), characterized in that: The upper end of the flow valve body (1) is provided with a horizontal sliding cover (5) which is slidably sealed at the inlet of the upper vent (101), and the upper end of the flow valve body (1) is provided with a driving mechanism connected to the horizontal sliding cover (5) for adjusting the size of the air supply port by controlling the sliding of the horizontal sliding cover (5) on the upper end of the flow valve body (1) through the driving mechanism.

2. A metering flow valve according to claim 1, characterized in that: The driving mechanism comprises a driving motor (6) and a screw (7); the driving motor (6) is mounted on the upper end of the flow valve body (1); the screw (7) is extended along the sliding direction of the horizontal sliding cover (5); the motor shaft of the driving motor (6) is connected to one end of the screw (7); the upper end of the horizontal sliding cover (5) is connected to a vertical connecting plate (8); the screw (7) is threadedly connected to the vertical connecting plate (8).

3. A metering flow valve according to claim 2, characterized in that: The motor shaft of the driving motor (6) is connected to one end of the screw rod (7) through a coupling; two vertical positioning plates (9) arranged parallel to the vertical connecting plate (8) are fixedly mounted on the upper end of the flow valve body (1), the two vertical positioning plates (9) are respectively located on both sides of the horizontal sliding cover (5), and the two ends of the screw rod (7) are respectively rotatably connected to the two vertical positioning plates (9) through bearings.

4. A metering flow valve according to claim 3, characterized in that: A sliding rod (10) arranged parallel to the screw rod (7) is connected between the two vertical positioning plates (9), and the vertical connecting plate (8) is slidably connected to the sliding rod (10) via a linear bearing.

5. A metering flow valve according to any one of claims 2 to 4, characterized in that: A horizontal limit plate (11) arranged above the horizontal slide cover (5) is fixed to the lower end of the vertical connection plate (8), and at least two vertical limit columns are fixed to the upper end of the horizontal slide cover (5). At least two limit holes are opened on the horizontal limit plate (11), and the upper parts of the vertical limit columns are matched and inserted into the limit holes.

6. A metering flow valve according to claim 5, characterized in that: At least two positioning bolts (12) are installed on the horizontal limiting plate (11), and a compression spring (13) is connected to the screw rod outer shell of the positioning bolt (12), and the two ends of the compression spring (13) are respectively in contact with the horizontal limiting plate (11) and the horizontal sliding cover (5).

7. A metering flow valve according to any one of claims 1 to 4, characterized in that: A filter cover (14) is installed at the upper end of the flow valve body (1), and a horizontal sliding cover (5) is arranged in the filter cover (14).

8. A metering flow valve according to claim 1, characterized in that: A plurality of feed pipes (2) are installed on one side of the flow valve body (1), and the feed port of each feed pipe (2) is connected to a material bin; and a cylinder (3) is installed on the other side of the flow valve body (1) corresponding to each feed pipe (2).

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