A pressure-feed switching discharge valve

Abstract

The present invention relates to a special device suitable for switching unloading when the material reaches the top of the unloading bin during the positive pressure pneumatic conveying of powdery, fibrous and granular materials. The device can realize the rapid separation of the material and the compressed air during unloading. The material is unloaded into the bin, and the compressed air is guided back to the pressure delivery pipe from the rotating tube. The device has the functions of material flow switching, automatic separation of material and gas, and rapid unloading, thereby simplifying the entire pressure delivery system, eliminating the two-way valve at each switching position, eliminating the flat belt pulse dust collector on the top of each unloading bin, and eliminating a set of tail gas collection and suction pipe network. Moreover, after the compressed air carrying the material is separated from the material when entering the bin, it can return to the original material delivery bin along the pressure delivery pipeline, forming the entire pressure delivery pipe network loop, and the compressed air can be recycled, reducing emissions, protecting the environment, and saving energy and reducing consumption.

Description

Technical Field

[0001] The invention belongs to the technical field of food and chemical industry, and in particular relates to a pressure-feeding switching discharge valve. Background Art

[0002] Compared with traditional mechanical methods, the pneumatic conveying technology for conveying powdered and fine bran materials has the advantages of flexible conveying lines, long conveying distances, fast conveying, no material residue during the conveying process, no external pollution, convenient combination switching and multi-point unloading. It is an efficient and clean conveying method that has been widely used in domestic grain, food, chemical, cement, medicine and other industries. At present, the commonly used warehouse unloading method, especially when multiple points of unloading are required in series, mostly adopts a two-way valve to switch the conveying direction, and at the same time, a set of devices for exhaust gas collection is set on the top of the unloading warehouse. One way to collect exhaust gas is to install a flat bag dust collector on the top cover of the unloading warehouse, and another way is to connect a suction duct to the top cover of the unloading warehouse, and connect the suction ducts on multiple unloading warehouses in parallel to form a set of special suction wind nets, and then the air used as the material conveying carrier is collected by the fan and sucked into a pulse dust collector for centralized treatment. Both methods have their own shortcomings. Although the first method does not require a set of suction pipes, the settled materials in each unloading bin fall back into its own bin and the materials will not cross. However, each bin top is equipped with a flat bag pulse, which increases the equipment investment. The pulse sedimentation powder falling into the bin is also prone to cause material contamination. This unloading method requires sufficient height space on the bin top, which is a more difficult problem encountered by enterprises when using pneumatic pressure to deliver materials. The second method requires a separate set of wind nets to collect the suction on the top of each unloading bin. There is a problem that materials of different varieties and qualities in unloading bins are easy to cross, especially in the grain and food industry with high hygiene requirements. The powder collected by the dust collector cannot be returned to the main material and can only be downgraded. The materials collected by the pulse dust collector can account for 1%-2% of the conveying volume, which causes certain economic losses to the enterprise. Summary of the invention

[0003] The present invention aims to solve the problems in the current pneumatic pressure conveying system, such as the difficulty in separating the material and the gas when the material enters the warehouse, the easy pollution and loss of the material caused by the tail gas dust removal, the numerous system equipment configurations, and the high height requirement for the installation of the warehouse top equipment. The invention simplifies the pressure conveying system, reduces the system investment, saves energy and reduces consumption, and finally realizes the efficient, clean and energy-saving pneumatic pressure conveying of materials to meet the booming pneumatic pressure conveying of powder materials.

[0004] Specifically, a pressure-feeding switching discharge valve is characterized in that:

[0005] It includes a shell, a mounting flange, a pipe connecting flange, a shell top cover, a lever, a cylinder, a mounting bracket, a downward rotating baffle plate, a straight-through pipe, and an exhaust pipe;

[0006] The lower end of the shell is provided with a mounting flange, the upper end of the shell is provided with a shell top cover, and both sides of the shell are provided with pipeline connection flanges. The pressure-feeding switching discharge valve is installed on the feed inlet flange on the top of the discharge bin through the mounting flange on the shell. The pipeline connection flanges on both sides of the shell are respectively connected to the pressure-feeding pipeline system.

[0007] The cylinder is installed on the top cover of the shell through the cylinder mounting bracket. The top of the cylinder arm of the cylinder is connected to the lever mounted at the center of the top cover of the shell and drives the lever to move. A straight-through pipe is opened inside the shell. The center of the straight-through pipe is fixedly connected to the rotating shaft of the lever. The straight-through pipe rotates through the rotation of the rotating shaft of the lever. A downward rotating baffle plate is arranged on one side of the straight-through pipe, and an exhaust pipe is arranged on the other side of the straight-through pipe.

[0008] Furthermore, the downward rotating baffle plate is an arc-shaped plate structure. After the gas-carrying material is sprayed onto the downward rotating baffle plate, the material centrifugally rotates downward along the arc into the discharge bin, and the air is guided by the negative pressure in the rear pipeline from the open mouth at the bottom of the exhaust pipe to enter the pressure delivery pipeline through the circular hole on the upper side of the exhaust pipe and then discharged.

[0009] The technical solution of the present invention is further described in detail below through the accompanying drawings and specific implementation methods.

[0010] Beneficial effects:

[0011] 1. It integrates the functions of reversing, material-gas separation and unloading, simplifying the important unloading link in the entire powder pneumatic pressure conveying system;

[0012] 2. It replaces the unloading two-way valve used for switching the top of the silo when multiple unloading silos are connected in series in the pressure delivery network;

[0013] 3. It has the function of separating material and air, and eliminates the flat bag pulse and separate air suction net on the top of the silo;

[0014] 4. The material flow switching is fully pneumatically controlled, the valve turns quickly and accurately, and the failure rate is low. The valve has good sealing performance, and the air carrier is separated while the material enters the warehouse under the action of the rotating baffle plate;

[0015] 5. The entire pressure delivery pipe network forms a loop to ensure that the transported materials are free of pollution and loss;

[0016] 6. When not unloading, the equipment allows materials and gas to pass directly through without changing the cross section and increasing equipment resistance.

[0017] 7. The equipment is easy to install and requires low space on the top of the unloading bin, which is convenient for process design and equipment layout, saves floor height and reduces civil engineering investment.

[0018] This patented pressure-feeding switching discharge valve has the functions of material flow switching, automatic separation of material and gas, and rapid discharge, thereby simplifying the entire pressure-feeding system, eliminating the two-way valve at each switching position, eliminating the flat belt pulse dust collector on the top of each discharge bin, and eliminating a set of tail gas collection and suction pipe networks. In addition, the compressed air carrying the material can be separated from the material when entering the bin and can return to the original material distribution bin along the pressure-feeding pipeline, forming the entire pressure-feeding network loop. The compressed air can be recycled, reducing emissions, being environmentally friendly and sanitary, and saving energy and reducing consumption. The device is small in size and is particularly suitable for installation on the top of the bin. It adopts pneumatic control valves, and the steering is fast and reliable. It is a safe and reliable pneumatic pressure-feeding unloading switching device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the unloading operation state of the pressure-feeding switching unloading valve on the closed silo B of the present invention.

[0020] Figure 2 It is a schematic diagram of the unloading operation state of the pressure-feeding switching unloading valve on the closed silo A of the present invention.

[0021] Figure 3 This is the front view of the pressure-feed switching discharge valve.

[0022] Figure 4 yes Figure 3 Top view of the .

[0023] Figure 5 yes Figure 3 AA schematic diagram of the medium pressure delivery switching discharge valve in the discharge state.

[0024] Figure 6 yes Figure 3 AA schematic diagram of the medium pressure delivery switching discharge valve in straight-through state. DETAILED DESCRIPTION

[0025] In order to make the objectives, technical solutions and advantages of the present invention more clear, the common implementation modes of the present invention will be further described in detail below with reference to the accompanying drawings.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0027] Furthermore, in the description of the present invention, “plurality” means two or more than two, unless otherwise clearly and specifically defined.

[0028] like Figure 1-6 As shown: closed silo A, closed silo B, discharge valve 40,

[0029] Feed direction 32, tail gas direction 33, feed gas mixture 34, material downward rotation path 35,

[0030] A pressure-feed switching discharge valve 20, comprising a housing 1, a mounting flange 2, a pipe connecting flange 3, a housing top cover 4, a lever 5, a cylinder 6, a mounting bracket 7, a downward rotating baffle plate 8, a straight-through pipe 9, and an exhaust pipe 10;

[0031] The lower end of the shell 1 is provided with a mounting flange 2, the upper end of the shell is provided with a shell top cover 4, and both sides of the shell are respectively provided with pipeline connection flanges 3. The pressure-feeding switching discharge valve is installed on the feed port flange on the top of the discharge bin through the mounting flange 2 on the shell 1 to connect the feed port flange. The pipeline connection flanges 3 on both sides of the shell are respectively connected to the feed pipe 31 of the pressure-feeding pipeline system.

[0032] The cylinder 6 is mounted on the housing top cover 4 through a cylinder mounting bracket 7. The top of the cylinder arm of the cylinder 6 is connected to a lever 5 mounted at the center of the housing top cover and drives the lever 5 to move. A straight-through pipe 9 is provided inside the housing. The center of the straight-through pipe is fixedly connected to the rotating shaft of the lever. The straight-through pipe rotates by rotating the rotating shaft of the lever. A downward rotating baffle plate 8 is provided on one side of the straight-through pipe, and an exhaust pipe 10 is provided on the other side of the straight-through pipe.

[0033] The downward rotating baffle plate 8 is an arc-shaped plate structure. After the gas-carrying material is sprayed onto the downward rotating baffle plate 8, the material is centrifugally rotated downward along the arc into the discharge bin, and the air is guided by the negative pressure in the rear pipeline from the open mouth at the bottom of the exhaust pipe 10 to enter the pressure delivery pipeline through the circular hole on the upper side of the exhaust pipe 10 and then discharged.

[0034] The present invention provides a switching discharge valve installed on the top of a discharge bin in a powder pneumatic pressure conveying system, so that the powder conveyed by positive pressure can be quickly depressurized on the bin top and then settled into the bin, and at the same time, the airflow is guided back into the pressure feeding bin for recycling, thereby improving the conveying efficiency, simplifying the traditional switching and dust removal equipment, ensuring that the material is pollution-free and residue-free, and causing no material loss or waste, while reducing the number of equipment, saving investment, lowering the floor height, and facilitating installation on the bin top.

[0035] After the application of the patented pressure-feeding switching discharge valve in the pneumatic pressure-feeding system, only one pressure-feeding switching discharge valve needs to be installed on the top of each closed silo. As shown in the figure, the positive pressure delivery pipe connects the pressure-feeding switching discharge valves on each silo top in series. According to the process requirements, for example, when the system electrical control issues an instruction to deliver the material to the closed silo B, the pressure-feeding switching discharge valve on the closed silo A and the pressure-feeding switching discharge valves on other closed silos in the system will automatically switch to the "straight-through" state, that is, the compressed air carries the material flow directly through the device. At this time, the device is only a part of the pressure-feeding pipeline; at the same time, the pressure-feeding switching discharge valve on the closed silo B opens the "discharging" state. At this time, the material enters the silo through the discharge baffle in the pressure-feeding switching discharge valve and settles down, while the exhaust gas returns to the pressure-feeding pipeline along the exhaust pipe and continues to move forward to the material discharge silo at the starting point of the pressure-feeding, forming a closed cycle. Similarly, if the material needs to be pressure-transported to closed silo A, the pressure-transport discharge valve on the top of the silo is opened to the "discharging" state, while closed silo B and other closed silos in the pressure transport system are all in the "straight-through" state at the same time.

[0036] like Figure 2 As shown, the pressure-feeding switching discharge valve is installed on the flange of the feed port on the top of the discharge bin through the lower flange 2 on the shell 1, and the flanges 3 on both sides of the shell are respectively connected to the pressure-feeding pipeline system. When the electronic control system issues an instruction that the pressure-feeding discharge valve needs to discharge, the solenoid valve controls the pneumatic valve to ventilate the cylinder 6, and the cylinder 6 is installed on the shell top cover 4 through the cylinder mounting bracket 7. The cylinder arm drives the lever 5 to turn the downward rotating baffle plate 8 to the "discharging" state direction. When the air and material with a certain pressure follow the left flange 3, the material flow is guided by the downward rotating baffle plate 8 with a certain arc and rotates into the discharge bin. Due to the large difference in mass density between the material and the air, the material is separated from the air along the circumferential direction of the downward rotating baffle plate 8 under the action of centrifugal force through the rotation and downward rotation, and then rotates downward. As the space in the bin suddenly expands, the material flow speed drops sharply, and the material can be quickly settled into the bin. At the same time, because the air-blocking device is installed at the outlet of the closed bin, the air flow in the closed bin cannot be discharged from the bottom of the bin, so that the air carrier with a certain pressure is guided to be discharged from the exhaust pipe 10 extending into the inside of the discharge valve back to the pressure delivery pipeline and back to the original feeding bin. Once the closed bin is full and the level indicator on the bin sends a signal, the system electronic control system sends an instruction to stop the pressure delivery diversion discharge valve. At this time, the solenoid valve controls the pneumatic valve to switch the air intake direction, and the cylinder arm of the cylinder 6 retracts to drive the lever 5 to reset the downward rotating baffle plate 8 horizontally to the "straight-through" state. The straight-through pipe 9 in the pressure delivery diversion discharge valve is connected at this time, and the gas and material can pass directly forward.

[0037] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent change made to the above embodiment according to the essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A pressure-feed switching discharge valve, characterized in that: It comprises a housing (1), a mounting flange (2), a pipe connecting flange (3), a housing top cover (4), a lever (5), a cylinder (6), a mounting bracket (7), a downward rotating baffle plate (8), a straight pipe (9), and an exhaust pipe (10); The lower end of the shell (1) is provided with a mounting flange (2), the upper end of the shell is provided with a shell top cover (4), and both sides of the shell are respectively provided with pipeline connection flanges (3). The pressure-feeding switching discharge valve is installed on the feed inlet flange on the top of the discharge bin through the mounting flange (2) on the shell (1), and the pipeline connection flanges (3) on both sides of the shell are respectively connected to the pressure-feeding pipeline system. The cylinder (6) is mounted on the housing top cover (4) via a cylinder mounting bracket (7); the top of the cylinder arm of the cylinder (6) is connected to a lever (5) mounted at the center of the housing top cover and drives the lever (5) to move; a straight-through pipe (9) is provided inside the housing; the center of the straight-through pipe is fixedly connected to the rotating shaft of the lever; the straight-through pipe is rotated by the rotation of the rotating shaft of the lever; a downward rotating baffle plate (8) is provided on one side of the straight-through pipe against the top; the upper part of the exhaust pipe (10) is welded to the straight-through pipe (9) as a whole; the lower end of the exhaust pipe (10) extends into the body of the discharge bin; a circular hole having the same diameter as the pipes on both sides of the housing (1) is provided on the side; The downward rotating baffle plate (8) is an arc-shaped plate structure. After the gas-carrying material is sprayed onto the downward rotating baffle plate (8), the material is centrifugally rotated downward along the arc into the discharge bin, and the air is guided by the negative pressure in the rear pipeline from the open opening at the bottom of the exhaust pipe (10) to enter the pressure delivery pipeline through the circular hole on the upper side of the exhaust pipe (10) and then discharged; When the electronic control system issues an instruction that the pressure-feed discharge valve needs to discharge, the solenoid valve controls the pneumatic valve to ventilate the cylinder, and the cylinder is installed on the top cover of the shell through the cylinder mounting bracket. The cylinder arm moves to drive the lever to turn the downward rotating baffle plate to the direction of the discharge state; when the air and material with a certain pressure follow the left flange, the material flow is guided along the downward rotating baffle plate with a certain arc and rotates into the discharge bin. Due to the large difference in mass density between the material and the air, the material is separated from the air along the circumferential direction of the downward rotating baffle plate under the action of centrifugal force through the rotation and downward rotation, and then rotates downward. As the space in the bin suddenly expands, the material flow speed drops sharply, and the material is At the same time, because a wind-blocking device is installed at the outlet of the closed bin, the air flow in the closed bin cannot be discharged from the bottom of the bin, so that the air carrier with a certain pressure is guided to be discharged from the exhaust pipe extending into the inside of the unloading valve back to the pressure-feeding pipeline and back to the original feeding bin; once the closed bin is full and the material level sensor on the bin sends a signal, the system's electronic control system sends an instruction to stop the pressure-feeding diverting unloading valve. At this time, the solenoid valve controls the pneumatic valve to switch the air intake direction, and the cylinder arm of the cylinder retracts to drive the lever to reset the downward-spinning baffle plate to a horizontal position to a straight-through state. The straight-through pipe in the pressure-feeding diverting unloading valve is connected at this time, and the gas and material can pass directly forward.

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