Gate valve for powder conveying

Abstract

The utility model discloses a gate valve for powder conveying. The gate valve comprises a valve rod, a valve body and a gate plate. The core improvement is that a rubber sleeve is integrally embedded in the inner wall of the valve body channel, and an inner hole of the rubber sleeve adopts a continuous convergence structure design: the inner diameter is gradually reduced from the opening part of the valve body channel to the middle part to form a dead-corner-free inclined surface runner, so that powder automatically slides to the middle part of the channel under the action of gravity, and the risk of material accumulation and blockage of a traditional horizontal valve cavity is thoroughly eliminated. The rubber sleeve generates radial resilience force when being extruded by the flashboard, so that adhered powder can be stripped to realize self-cleaning, and the abrasion of the sealing surface can be dynamically compensated. According to the valve, through the cooperation mechanism of inclined plane flow guiding and elastic self-compensation, zero leakage is guaranteed, and meanwhile the blocking problem in the powder conveying process is solved.

Description

Technical Field

[0001] This utility model relates to the field of powder conveying technology, specifically to a gate valve for powder conveying. Background Technology

[0002] In mine filling and consolidation powder material conveying systems, it is often necessary to control the opening and closing of the material conveying process, and gate valves are one of the commonly used devices to achieve this control. Currently, the mainstream gate valve on the market, taking CN205877365U as an example, uses a pneumatic device to drive the valve plate, enabling the valve plate to open and close quickly. However, the above-mentioned gate valve has a fatal flaw when applied to powder conveying: its valve body bottom adopts a horizontal cavity structure, forming a 90° angle with the valve plate. This causes powder (especially fine powder or viscous materials) to accumulate at the bottom of the valve cavity. When the gate closes, the accumulated powder is squeezed into clumps, directly jamming between the valve plate and the valve seat sealing surface. This can lead to minor issues such as obstructing valve closure and causing leakage, or even severe issues such as cracking the valve plate or damaging the drive device. Utility Model Content

[0003] The purpose of this utility model is to disclose a gate valve for powder conveying, so as to solve the problem that existing gate valves are prone to clogging during powder conveying.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A gate valve for conveying powder includes a valve stem and a valve body. One end of the valve stem is connected to a gate, which is disposed in the valve body and can move vertically up and down perpendicular to the valve body. A rubber sleeve is embedded in the inner wall of the valve body channel. The inner diameter of the rubber sleeve is smaller closer to the middle of the valve body channel and larger closer to the valve body channel opening.

[0006] Compared with existing technologies, this utility model innovatively adopts a gradient rubber sleeve structure (the inner diameter continuously converges from the valve body channel opening to the middle). Through the synergistic effect of elastic materials and inclined flow channel design, it fundamentally overcomes the horizontal structural defects of traditional gate valves: its converging flow channel completely eliminates the dead corner of material accumulation in the valve cavity, ensuring that the powder slides smoothly under the action of gravity; at the same time, the rubber sleeve generates radial rebound force under the pressure of the gate, automatically peeling off the powder adhering to the gate surface and compensating for wear gaps. While achieving zero leakage sealing, it also gives the valve an inherent anti-clogging capability, perfectly adapting to the conveying conditions of highly fluid to viscous powders. Attached Figure Description

[0007] Figure 1 This is the main structural view of the present invention.

[0008] Figure 2 This is a side view of the structure of this utility model.

[0009] Figure 3 for Figure 2 Enlarged view of the structure of section A in the middle.

[0010] In the diagram, 1-valve stem, 2-valve body, 3-gate, 4-rubber sleeve, 5-handwheel, 6-wedge seal block, 7-sealing guide groove. Detailed Implementation

[0011] The present invention will be further explained below with reference to the accompanying drawings.

[0012] Example 1

[0013] like Figure 1-2 As shown, this utility model provides a gate valve for powder conveying, including a valve stem 1 and a valve body 2. The lower end of the valve stem 1 is connected to a gate 3 via a pin. The gate 3 is placed in the internal flow channel of the valve body 2. An operating platform is welded to the top of the valve body 2. A handwheel 5 is installed on the platform via a thrust bearing. The central threaded hole of the handwheel 5 engages with the external thread of the upper section of the valve stem 1. By rotating the handwheel 5, the gate 3 is driven to move up and down perpendicular to the axis of the valve body 2, thereby realizing the opening and closing of the valve body channel.

[0014] The inner wall of the valve body 2 is integrally fitted with a rubber sleeve 4. The inner hole of the rubber sleeve 4 has a continuously converging, gradually decreasing structure: its inner diameter gradually decreases from the opening of the valve body 2 channel towards the middle (see...). Figure 2 (Cross-sectional view). This design creates a sloped flow channel without dead angles, allowing the powder to automatically slide towards the center of the channel under gravity, completely eliminating the risk of material accumulation in traditional horizontal valve chambers.

[0015] Furthermore, when the gate 3 is pressed down to close, the rubber sleeve 4 is squeezed to generate radial rebound force, which on the one hand peels off the powder adhering to the sleeve wall to achieve self-cleaning, and on the other hand adaptively compensates for the wear of the sealing surface to ensure zero jamming during long-term operation.

[0016] Example 2

[0017] Based on Example 1, the rubber sleeve 4 extends outward and completely covers the flange sealing area at the end face of the valve body 2 (e.g., Figure 3 (Partial enlarged view). This design extends the sealing area to the pipe flange connection surface, preventing powder leakage from the valve body-pipe interface and improving the overall sealing reliability.

[0018] Example 3

[0019] Based on Example 1, a wedge-shaped sealing block 6 is welded to the lower end of the gate 3, and its inclined angle is perfectly matched with the sealing guide groove 7 opened at the bottom of the valve body 2 channel. When the gate 3 is closed, the wedge-shaped sealing block 6 is embedded in the sealing guide groove 7 to form a double mechanical seal, which works in conjunction with the elastic seal of the rubber sleeve 4 to block the penetration of powder under high pressure differential conditions.

Claims

1. A gate valve for powder conveying, characterized in that, It includes a valve stem (1) and a valve body (2). One end of the valve stem (1) is connected to a gate (3). The gate (3) is located inside the valve body (2) and can move up and down perpendicular to the valve body (2). A rubber sleeve (4) is embedded in the inner wall of the channel of the valve body (2). The inner diameter of the rubber sleeve (4) is smaller closer to the middle of the channel of the valve body (2) and larger closer to the opening of the channel of the valve body (2).

2. The gate valve for powder conveying as described in claim 1, characterized in that, The rubber sleeve (4) extends outward to the end flange of the valve body (2).

3. The gate valve for powder conveying as described in claim 1, characterized in that, An operating platform is fixed to the top of the valve body (2), and a handwheel (5) is connected to the operating platform via a bearing. The handwheel (5) is threadedly connected to the valve stem (1).

4. The gate valve for powder conveying as described in claim 1, characterized in that, The lower end of the gate (3) is provided with a wedge-shaped sealing block (6), which matches the sealing guide groove (7) provided at the bottom of the valve body (2) channel.

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