Pneumatic flow-limiting valve

Abstract

The utility model discloses a pneumatic flow-limiting valve which comprises a valve body. A feeding hole is formed in the top of the valve body, and a discharging hole corresponding to the feeding hole is formed in the bottom of the valve body; a flashboard mechanism for adjusting a communication gap between the feed port and the discharge port through rotation is arranged between the feed port and the discharge port; the bottom of the feeding port is arranged to be in an inwards-concave arc shape. And the flashboard mechanism comprises an arc-shaped plate matched with the bottom of the discharge hole. The gate plate mechanism for adjusting the communication gap between the feeding port and the discharging port through rotation is arranged between the feeding port and the discharging port of the valve body, the bottom of the discharging port is arranged to be in the concave arc shape, meanwhile, the scraper plate mechanism connected to the arc-shaped plate in an abutting mode is arranged, and when the arc-shaped plate is closed, the scraper plate mechanism can rotate to adjust the communication gap between the feeding port and the discharging port. The scraper mechanism and the side, away from the scraper mechanism, of the discharging port make contact with the arc-shaped plate to close the communicating gap between the discharging port and the feeding port, so that the situation of material leakage is prevented, meanwhile, the scraper mechanism can scrape away materials left on the arc-shaped plate, and the utilization rate of feed is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of flow-limiting valves, in particular to a pneumatic flow-limiting valve. Background Art

[0002] In the industries of grain, feed and minerals, pneumatic flow-limiting valves are used more and more widely and in large quantities. At present, there is a situation of material leakage in the use of existing flow-limiting valves for granular materials or powdery materials.

[0003] Therefore, it is necessary to design a pneumatic flow-limiting valve to solve the above problems. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a pneumatic flow-limiting valve in view of the problem of material leakage of the existing pneumatic flow-limiting valve for granular materials or powdery materials in the process.

[0005] The technical solution of the utility model is: a pneumatic flow-limiting valve, including a valve body; a feed inlet is arranged at the top of the valve body, and a discharge outlet corresponding to the feed inlet is arranged at the bottom; a gate mechanism for adjusting the communication gap between the feed inlet and the discharge outlet by rotation is arranged between the feed inlet and the discharge outlet; the bottom of the feed inlet is arranged in an inward concave arc shape; the gate mechanism includes an arc-shaped plate matching with the bottom of the discharge outlet, and the arc-shaped plate is eccentrically arranged with the bottom of the feed inlet; a scraping mechanism abutting against the arc-shaped plate is arranged on one side of the discharge outlet; when the arc-shaped plate is closed, both the scraping mechanism and the side of the discharge outlet away from the scraping mechanism are in contact with the arc-shaped plate to close the communication gap between the discharge outlet and the feed inlet.

[0006] The gate mechanism further includes a driving component and two connecting plates arranged at both ends of the arc-shaped plate; one ends of the two connecting plates are connected to the arc-shaped plate, and the other ends of the two connecting plates are connected to the valve body through coaxial rotating shafts; the driving component is connected to one of the rotating shafts.

[0007] The driving component includes a mounting frame and a driving cylinder arranged on the mounting frame; the end of the piston rod of the driving cylinder is connected to the rotating shaft through a driving rod; the driving cylinder is connected with a three-position five-way solenoid valve.

[0008] The feed inlet of the valve body is composed of a circle of sealing plates arranged at the top of the valve body.

[0009] The scraping mechanism includes a mounting seat fixed on one side of the discharge outlet; an installation groove is arranged vertically at the bottom of the mounting seat; a floating scraping plate arranged vertically is movably arranged in the installation groove, and the bottom of the floating scraping plate is in contact with the arc-shaped plate.

[0010] A cavity for the movement of the arc-shaped plate is arranged on one side of the valve body where the scraping mechanism is located; the cavity is provided with a maintenance cover.

[0011] With the above technical solution, the utility model has the following beneficial effects: (1) Between the feed inlet and the discharge outlet of the valve body of the utility model, there is a gate mechanism that adjusts the communication gap between the feed inlet and the discharge outlet by rotation. The bottom of the discharge outlet is set in an inward concave arc shape. At the same time, a scraping mechanism is provided that abuts against the arc-shaped plate. The arc-shaped plate is eccentrically arranged with the bottom of the feed inlet. When the arc-shaped plate is closed, both the scraping mechanism and the side of the discharge outlet away from the scraping mechanism are in contact with the arc-shaped plate to close the communication gap between the discharge outlet and the feed inlet, thereby preventing material leakage. At the same time, the scraping mechanism can scrape the residual material on the arc-shaped plate clean, improving the utilization rate of the feed.

[0012] (2) The driving component of the utility model adopts a driving cylinder, and the driving cylinder is connected to a three-position five-way solenoid valve, which can control the stroke of the driving cylinder, so that the arc-shaped plate can be adjusted in multiple gears, thus facilitating the adjustment of the flow rate of the flow limiting valve.

[0013] (3) The utility model is provided with a cavity in the valve body for the movement of the arc-shaped plate to facilitate the closing of the arc-shaped plate. At the same time, the cavity has a maintenance cover to facilitate the maintenance and repair of the interior of the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to make the content of the utility model easier to be clearly understood, the following further detailed description of the utility model is given according to specific embodiments in conjunction with the drawings.

[0015] Figure 1 It is a schematic structural diagram of the utility model.

[0016] Figure 2 It is a cross-sectional view of the utility model.

[0017] Figure 3 It is Figure 2 an enlarged view of part A in

[0018] Figure 4 It is a schematic diagram of the open state of the arc-shaped plate of the utility model.

[0019] Figure 5 It is a schematic diagram of the closed state of the arc-shaped plate of the utility model.

[0020] The reference numerals in the drawings are:

[0021] Valve body 1, maintenance cover 1-1, feed inlet 2, discharge outlet 3, gate mechanism 4, arc-shaped plate 4-1, driving component 4-2, mounting bracket 4-2-1, driving cylinder 4-2-2, three-position five-way solenoid valve 4-2-3, connecting plate 4-3, rotating shaft 4-4, driving rod 4-5, scraping mechanism 5, mounting seat 5-1, mounting groove 5-2, floating scraper 5-3. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] (Example 1)

[0023] See Figures 1 to 5 A pneumatic flow-limiting valve in this embodiment includes a valve body 1; a feed port 2 is provided at the top of the valve body 1, and a discharge port 3 corresponding to the feed port 2 is provided at the bottom; a gate mechanism 4 for adjusting the communication gap between the feed port 2 and the discharge port 3 by rotation is provided between the feed port 2 and the discharge port 3; the bottom of the feed port 2 is set in a concave arc shape; the gate mechanism 4 includes an arc-shaped plate 4-1 matching the bottom of the discharge port 3, and the arc-shaped plate 4-1 is eccentrically arranged with the bottom of the feed port 2, that is, the center of the arc-shaped plate 4-1 is not concentric with the arc of the bottom of the feed port 2, so as to ensure that when the arc-shaped plate 4-1 is closed, it can stably fit with the bottom of the feed port, and at the same time there is no friction between the arc-shaped plate 4-1 and the bottom of the feed port 2, avoiding the occurrence of material leakage due to the friction of the arc-shaped plate 4-1; a scraping mechanism 5 is provided on one side of the discharge port 3 and abuts against the arc-shaped plate 4-1; when the arc-shaped plate 4-1 is closed, both the scraping mechanism 5 and the side of the discharge port 3 away from the scraping mechanism 5 are in contact with the arc-shaped plate 4-1 to close the communication gap between the discharge port 3 and the feed port 2.

[0024] Further, for the convenience of installing the arc-shaped plate 4-1, the gate mechanism 4 further includes a driving component 4-2 and two connecting plates 4-3 provided at both ends of the arc-shaped plate 4-1; one ends of the two connecting plates 4-3 are connected to the arc-shaped plate 4-1, and the other ends of the two connecting plates 4-3 are connected to the valve body 1 through a coaxial rotating shaft 4-4. For the convenience of installing the rotating shaft 4-4, a bearing seat matching the rotating shaft 4-4 is provided on the valve body 1; the driving component 4-2 is connected to one of the rotating shafts 4-4.

[0025] Further, the driving component 4-2 includes a mounting frame 4-2-1 and a driving cylinder 4-2-2 provided on the mounting frame 4-2-1; the end of the piston rod of the driving cylinder 4-2-2 is connected to the rotating shaft 4-4 through a driving rod 4-5; the driving cylinder 4-2-2 is connected with a three-position five-way solenoid valve 4-2-3 to facilitate the control of the stroke of the driving cylinder 4-2-2, so as to realize the multi-stage adjustment of the arc-shaped plate 4-1 and facilitate the control of the flow rate of the flow-limiting valve.

[0026] Further, for the convenience of making the bottom of the feed port 2 fit better with the arc-shaped plate 4-1, the feed port 2 of the valve body 1 is composed of a circle of sealing plates provided at the top of the valve body 1.

[0027] Further, for the convenience of installing the scraping mechanism 5, the scraping mechanism 5 includes a mounting seat 5-1 fixed to one side of the discharge port 3; a mounting groove 5-2 is provided vertically at the bottom of the mounting seat 5-1; a floating scraper 5-3 arranged vertically is movably provided in the mounting groove 5-2, and the bottom of the floating scraper 5-3 contacts the arc-shaped plate 4-1. The floating scraper 5-3 can be limited in the mounting groove 5-2 by a step to prevent the floating scraper 5-3 from falling off during maintenance.

[0028] Further, for the convenience of later maintenance and repair of the interior of the valve body 1, a cavity for the movement of the arc-shaped plate 4-1 is provided on one side of the valve body 1 where the scraping mechanism 5 is located; the cavity is provided with an inspection cover 1-1.

[0029] In the pneumatic flow-limiting valve of this embodiment, a gate mechanism 4 for adjusting the communication gap between the feed port 2 and the discharge port 3 by rotation is provided between the feed port 2 and the discharge port 3 of the valve body 1. The bottom of the discharge port 3 is set to be concave in an arc shape. At the same time, a scraping mechanism 5 abutted against the arc-shaped plate 4-1 is provided. When the arc-shaped plate 4-1 is closed, both the scraping mechanism 5 and the side of the discharge port 3 away from the scraping mechanism 5 contact the arc-shaped plate 4-1 to close the communication gap between the discharge port 3 and the feed port 2, thereby preventing material leakage. At the same time, the scraping mechanism 5 can scrape the residual material on the arc-shaped plate 4-1 clean, improving the utilization rate of the feed.

[0030] The specific embodiments described above have further elaborated on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A pneumatic flow limiting valve, characterized in that: The invention comprises a valve body (1); a feed port (2) is provided at the top of the valve body (1), and a discharge port (3) corresponding to the feed port (2) is provided at the bottom; a gate mechanism (4) is provided between the feed port (2) and the discharge port (3) for adjusting the communication gap between the feed port (2) and the discharge port (3) by rotation; the bottom of the feed port (2) is arranged in a concave arc shape; the gate mechanism (4) comprises an arc plate (4-1) matching the bottom of the discharge port (3), and the arc plate (4-1) is eccentrically arranged with the bottom of the feed port (2); a scraper mechanism (5) abutting against the arc plate (4-1) is provided on one side of the discharge port (3); when the arc plate (4-1) is closed, the scraper mechanism (5) and the side of the discharge port (3) away from the scraper mechanism (5) both contact the arc plate (4-1) to close the communication gap between the discharge port (3) and the feed port (2).

2. A pneumatic flow limiting valve according to claim 1, characterized in that: The gate mechanism (4) further comprises a driving assembly (4-2) and two connecting plates (4-3) arranged at both ends of the arc-shaped plate (4-1); one end of the two connecting plates (4-3) are connected to the arc-shaped plate (4-1), and the other ends of the two connecting plates (4-3) are connected to the valve body (1) via coaxially arranged rotating shafts (4-4); the driving assembly (4-2) is connected to one of the rotating shafts (4-4).

3. A pneumatic flow limiting valve according to claim 2, characterized in that: The driving assembly (4-2) comprises a mounting frame (4-2-1) and a driving cylinder (4-2-2) arranged on the mounting frame (4-2-1); the end of the piston rod of the driving cylinder (4-2-2) is connected to the rotating shaft (4-4) via a driving rod (4-5); and the driving cylinder (4-2-2) is connected to a three-position five-way solenoid valve (4-2-3).

4. A pneumatic flow limiting valve according to claim 1, characterized in that: The feed inlet (2) of the valve body (1) is composed of a circle of sealing plates arranged on the top of the valve body (1).

5. A pneumatic flow limiting valve according to claim 1, characterized in that: The scraper mechanism (5) comprises a mounting seat (5-1) fixed to one side of the discharge port (3); a mounting groove (5-2) is vertically arranged at the bottom of the mounting seat (5-1); a floating scraper (5-3) arranged vertically is movably arranged in the mounting groove (5-2), and the bottom of the floating scraper (5-3) is in contact with the arc plate (4-1).

6. A pneumatic flow limiting valve according to claim 1, characterized in that: The valve body (1) is provided with a cavity for the arc plate (4-1) to move on one side of the scraper mechanism (5); the cavity has an inspection cover (1-1).

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