An automatic valve device suitable for separate discharge of solid material in a positive pressure air duct

Abstract

The application discloses an automatic valve device suitable for separate discharge of solid materials in a positive pressure air duct, which comprises a shell, characterized in that the inner cavity of the shell is separated into independent upper and lower chambers through a partition device, the bottom of the upper chamber and the bottom of the lower chamber are respectively provided with discharge outlets, the upper discharge outlet and the lower discharge outlet are both square discharge outlets, and the lower end faces of the upper discharge outlet and the lower discharge outlet are both inclined bevels, automatic plug door devices are respectively arranged at the upper discharge outlet and the lower discharge outlet, and two sets of the automatic plug door devices are controlled by a control device to be opened and closed in turns. According to the application, the two plug doors are opened and closed in turns, so that only a small amount of high-pressure air is discharged with the materials, and the effect of isolating the positive pressure air is achieved; the upper chamber and the lower chamber are both provided with square discharge outlets, and the cross sections of the discharge outlets are processed into bevels, so that the materials are prevented from being clamped on the contact surface and affecting the sealing when the plug door is in contact with the discharge outlet and is pressed tightly, and the sealing effect is better.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pneumatic conveying devices, in particular to an automatic valve device suitable for separate discharge of solid materials in a positive pressure air duct. BACKGROUND

[0002] Pneumatic conveying devices have the advantages of simple structure, convenient operation, large conveying capacity, long conveying distance and high conveying speed, and are widely used in industrial production.

[0003] Among them, positive pressure pneumatic conveying is suitable for transporting materials such as cement, fly ash, food, resin and dry chemicals from a single or multiple sources to a single or multiple destinations.

[0004] The positive pressure pneumatic conveying system usually uses a plug door to discharge and isolate materials. For example, Chinese invention patent CN116374634A discloses a positive pressure pneumatic conveying system, the lower side of the stock bin is provided with a discharge controller, the lower side of the discharge controller is provided with a conveying assembly, the discharge controller includes a connecting seat and a plug valve, a conveying passage is formed in the inner side of the connecting seat for shunting materials into different pipelines, the plug valve is correspondingly arranged with the conveying passage for controlling the flow of materials, the lower side of the connecting seat is connected with a distribution pipe, and the stock bin and the distribution pipe are communicated through the conveying passage. However, the sealing gap of the plug door in this scheme is easily blocked by materials and cannot be normally closed, resulting in air leakage of the plug door, poor sealing effect and affecting the normal operation of the equipment.

[0005] Therefore, it is necessary to improve the existing pneumatic conveying device to improve the sealing performance of the plug valve. SUMMARY

[0006] To solve the above-mentioned defects, the technical problem to be solved by the present application is to provide an automatic valve device suitable for separate discharge of solid materials in a positive pressure air duct, so as to solve the problem of poor sealing performance of the plug valve in the prior art, which affects the normal operation of the equipment.

[0007] Therefore, the automatic valve device suitable for separate discharge of solid materials in a positive pressure air duct provided by the present application comprises a shell, characterized in that the inner cavity of the shell is divided into independent upper and lower chambers by a partition device, the bottom of the upper chamber and the bottom of the lower chamber are respectively provided with discharge ports, the upper discharge port and the lower discharge port are both square discharge ports, and the lower end faces of the upper discharge port and the lower discharge port are both inclined bevels, the upper discharge port and the lower discharge port are respectively provided with automatic plug door devices, and the two sets of automatic plug door devices are controlled by a control device to open and close alternately.

[0008] In the above technical solution, preferably, the automatic plug door device comprises:

[0009] A support is fixed on the shell;

[0010] A plug door is located below the discharge port and has the same slope angle as the slope of the discharge port. The plug door is slidingly arranged on the support.

[0011] An opening and closing mechanism includes a push-pull rod, a shift fork and a hydraulic cylinder. The hydraulic cylinder is fixed at the rear end of the support. The hydraulic cylinder has an extendable push rod. The push rod is fixed to the upper end of the shift fork. The front end of the push-pull rod is slidingly arranged on the plug door. The rear end of the push-pull rod is fixedly connected to the lower end of the shift fork. A first spring is sleeved on the push-pull rod and abuts against the plug door and the shift fork, respectively.

[0012] In the above technical solution, preferably, the automatic plug door device further comprises a mechanical sealing mechanism, which comprises:

[0013] A concentric shaft is located below the plug door and has an axis perpendicular to the moving direction of the plug door. The concentric shaft is rotationally arranged on the support.

[0014] Two transmission discs are fixed at the two ends of the concentric shaft, respectively. The two ends of the concentric shaft are also provided with eccentric bearings, respectively. The two eccentric bearings are located on the inner sides of the transmission discs and correspond to the edges on both sides of the plug door.

[0015] Two transmission rods are slidingly arranged on the support.

[0016] Two connecting rods are hingedly connected to the middle part of the transmission rods at the rear ends and are hingedly connected to the transmission discs at the front ends.

[0017] In the above technical solution, preferably, the support is provided with a vertical plate corresponding to the two ends of the plug door. The vertical plate is provided with a sliding groove corresponding to the plug door. A circular tube is fixed to the lower wall of the sliding groove. The two circular tubes are located at the edges on both sides of the plug door and form sliding rails for the movement of the plug door.

[0018] In the above technical solution, preferably, the front end of the support is further provided with a limiting block for limiting the closing position of the plug door.

[0019] In the above technical solution, preferably, the front ends of the two transmission rods are fixed by a lower cross beam. The rear ends of the two transmission rods are connected to an upper cross beam by a second spring.

[0020] In the above technical solution, preferably, the support is further provided with a reset spring. One end of the reset spring is fixed to the support and the other end is connected to the transmission rod. The reset spring is used to reset the transmission rod when the push rod of the hydraulic cylinder is retracted.

[0021] In the technical scheme, preferably, the lower part of the upper chamber and the lower chamber is conical.

[0022] In the technical scheme, preferably, the transmission disc is provided with a plurality of pin shafts in the circumferential direction, and the front end of the connecting rod is hinged to one of the pin shafts.

[0023] In the technical scheme, preferably, the rear end of the plug-in door is provided with a downwardly bent bent plate, the bent plate is provided with a through hole, the front end of the push-pull rod is inserted into the through hole of the bent plate and can slide along the through hole.

[0024] According to the technical scheme, the automatic valve equipment suitable for separate discharge of solid materials in a positive pressure air duct is provided, and the problem of poor sealing performance of the plug-in valve in the prior art is solved. Compared with the prior art, the automatic valve equipment has the following beneficial effects:

[0025] Through the turn-by-turn opening and closing of the two plug-in doors, only a small amount of high-pressure air is discharged with the materials, and the effect of isolating the positive pressure air is achieved. The upper chamber and the lower chamber are both provided with a square discharge port, and the cross section of the discharge port is processed into a bevel, which can prevent the materials from being stuck on the contact surface when the plug-in door is in contact with the discharge port and affects the sealing, and the sealing effect is better. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical schemes in the prior art, the drawings needed in the description of the embodiments of the present application or the prior art will be briefly introduced and described below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating any creative labor.

[0027] Figure 1 The schematic view of the automatic valve equipment suitable for separate discharge of solid materials in a positive pressure air duct is provided.

[0028] Figure 2 The schematic view of the automatic plug-in door device in the present application is provided.

[0029] Figure 3 The A-A sectional view in Figure 2

[0030] Figures 1-3 In the technical scheme, the corresponding relationship of the parts is as follows:

[0031] The shell 10, the automatic plug-in door device 20;

[0032] The partition device 11, the upper chamber 12, the lower chamber 13, the upper discharge port 14, and the lower discharge port 15;

[0033] ​Support 21, plug door 22, vertical plate 23, sliding groove 24, round pipe 25;

[0034] Push rod 261, shift fork 262, hydraulic cylinder 263, push rod 264, first spring 265, limiting block 266;

[0035] Transmission rod 271, connecting rod 272, transmission disc 273, concentric shaft 274, eccentric bearing 275, second spring 276, upper cross beam 277, return spring 278. DETAILED DESCRIPTION

[0036] The technical solutions of the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings of the embodiments of the present application. Obviously, the following described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0037] In order to make the technical solutions and implementation modes of the present application clearer and more understandable, several preferred specific embodiments for implementing the technical solutions of the present application are introduced below.

[0038] It should be noted that the orientation words such as "inner", "outer", "front", "rear", "left" and "right" in the present application are described based on the product use state as the reference object, and obviously, the use of the corresponding orientation words does not constitute a limitation on the protection scope of the present application.

[0039] Please refer to Figure 1 , Figure 1 A schematic diagram of an automatic valve device suitable for separate discharge of solid materials in a positive pressure air duct is provided in the present application.

[0040] As shown in Figure 1 , the automatic valve device suitable for separate discharge of solid materials in a positive pressure air duct provided in the present application comprises a shell 10, the inner cavity of which is divided into independent upper chamber 12 and lower chamber 13 by partition device 11, and the bottoms of the upper chamber 12 and the lower chamber 13 are respectively provided with discharge ports. Among them, the front end of the partition device 11 is conical and is provided with an upper discharge port 14, and the front end of the lower chamber 13 is also conical and is provided with a lower discharge port 15. The upper discharge port 14 and the lower discharge port 15 are both square discharge ports, and the lower end faces of both are inclined bevels. The upper discharge port 14 and the lower discharge port 15 are respectively provided with automatic plug door device 20 for opening or closing the upper discharge port 14 and the lower discharge port 15.

[0041] The two sets of automatic plug door devices 20 are controlled by the control device. When discharging the material, the upper discharge port 14 is closed first, and after 3 seconds, the lower discharge port 15 is opened to discharge the material in the lower chamber 13. The discharge time is controlled according to the amount of material. After the material in the lower chamber 13 is discharged, the lower discharge port 15 is closed, and after 3 seconds, the upper discharge port 14 is opened to make the material in the lower chamber 13 fall into the lower chamber 13. When the lower chamber 13 is about to be filled, the upper discharge port 14 is closed, the material is temporarily stored in the upper discharge port 14, and then the lower discharge port 15 is opened. The cycle is repeated.

[0042] The two sets of automatic plug door devices 20 arranged at the upper discharge port 14 and the lower discharge port 15 are the same in structure. The specific structure of the automatic plug door device 20 arranged at the upper discharge port 14 will be described in detail below.

[0043] As shown in Figure 2 , Figure 3 The automatic plug door device 20 includes a bracket 21 and a plug door 22 slidingly arranged on the bracket 21. For the convenience of description, the direction towards the plug door is defined as front, and the direction towards the hydraulic cylinder is defined as back in the following description.

[0044] The bracket 21 is fixed on the shell 10, and the plug door 22 is located below the discharge port (the upper discharge port 14) and has the same inclination angle as the bevel of the discharge port (the upper discharge port 14). The bracket 21 is provided with a vertical plate 23 corresponding to each end of the plug door 22, and the vertical plate 23 is provided with a sliding groove 24 corresponding to the plug door 22. A circular tube 25 is fixed on the lower wall of the sliding groove 24, and the two circular tubes 25 are located at the two side edges of the plug door 22, forming the sliding rail of the plug door 22. The plug door 22 can smoothly slide on the track formed by the circular tube 25, and since the material is not easy to accumulate on the outer surface of the circular tube, the accumulation of the material falling from the discharge port can be prevented from affecting the sliding of the plug door 22.

[0045] The plug door 22 is driven by an opening and closing mechanism, which includes a push-pull rod 261, a shift fork 262, and a hydraulic cylinder 263.

[0046] The rear end of the support 21 is provided with an end plate 23, and the hydraulic oil cylinder 263 is fixed outside the end plate 23, that is, the hydraulic oil cylinder 263 is fixed at the rear end of the support 21. The hydraulic oil cylinder 263 has a telescopic push rod 264, and the push rod 264 is fixed with the upper end of the shift fork 262 through the end plate 23. The rear end of the plug door 22 is provided with a downwardly bent bent plate 221, the bent plate 221 is provided with a through hole, the rear end of the push-pull rod 261 is fixedly connected with the lower end of the shift fork 262, the front end of the push-pull rod 261 is inserted into the through hole on the bent plate 221 and can slide along the through hole. The push-pull rod 261 is sleeved with a first spring 265, and the two ends of the first spring 265 can move forward with the push-pull rod 261 and abut against the bent plate 221 and the shift fork 262 respectively.

[0047] The push rod 264 of the hydraulic oil cylinder 263 is telescopic, drives the shift fork 262 to move, and in turn drives the plug door 22 to move forward and backward, opens or closes the upper discharge port 14 or the lower discharge port 15.

[0048] The end faces of the upper discharge port 14 and the lower discharge port 15 are all machined into inclined bevels, and the material can slide along the bevels, which can prevent the material from being clamped on the contact surface when the plug door 22 is in contact with the discharge port and tightly pressed, and the plug door 22 is clamped, so that better sealing effect is achieved.

[0049] The front end of the support 21 is also provided with a limiting block 266 for limiting the closing position of the plug door 22.

[0050] The application also has a mechanical sealing mechanism, which comprises two transmission rods 271, two connecting rods 272 and two transmission discs 273. The support 21 is also rotatably provided with a concentric shaft 274 below the plug door 22, and the axis is perpendicular to the moving direction of the plug door 22. The two transmission discs 273 are fixed at the two ends of the concentric shaft 274, and the two ends of the concentric shaft 274 are also respectively provided with eccentric bearings 275. The two eccentric bearings 275 are respectively located on the inner side of the transmission disc 273 and correspond to the edges on both sides of the plug door 22. The rear end of the connecting rod 272 is hinged to the middle part of the transmission rod 271, and the front end is hinged to the transmission disc 273. Specifically, a plurality of pin shafts are arranged on the transmission disc 273 in the circumferential direction, and the front end of the connecting rod 272 is hinged to one of the pin shafts, and the clamping force of the eccentric bearing 275 can be adjusted by being hinged to different pin shafts.

[0051] The transmission rod 271 is slidably arranged on the top surface of the support 21, and the sliding direction is the same as the moving direction of the plug door 22, for example, two supporting plates can be arranged on the top surface of the support 21, the supporting plates are provided with through holes, and the two ends of the transmission rod 271 are slidably arranged in the through holes of the supporting plates and can slide along the through holes of the supporting plates.

[0052] The front ends of the two transmission rods 271 are fixed through the lower cross beam, the rear ends of the two transmission rods 271 are connected with the upper cross beam 277 through the second spring 276, and the upper cross beam 277 and the rear ends of the transmission rods 271 have a compression allowance of the second spring 276. The upper cross beam 277 is arranged opposite to the push rod 264 of the hydraulic oil cylinder 263, and the push rod 264 can push the upper cross beam 277, and then push the transmission rod 271 to move.

[0053] When the plug door 22 is closed to the position, the mechanical sealing mechanism can push the eccentric bearing 275 below the plug door 22 to be lifted upward, so that the plug door 22 is tightly pressed against the discharge port, and the discharge port is sealed. Thus, the double effects of anti-jamming and sealing are realized.

[0054] The bracket 21 is further provided with a reset spring 278, one end of the reset spring 278 is fixed with the bracket 21, and the other end is connected with the transmission rod 271, so as to reset the transmission rod 271 when the push rod 264 of the hydraulic oil cylinder 263 is retracted, and then drive the transmission disc 273, the concentric shaft 274 and the eccentric bearing 275 to reset and return to the initial position when the plug door 22 is in the open state.

[0055] The automatic valve equipment suitable for the separate discharge of solid materials in the positive pressure air duct is provided, and the closing process of the automatic plug door device 20 includes the following three stages.

[0056] The first stage is that the plug door is closed.

[0057] The hydraulic oil cylinder 263 is supplied with oil, the push rod 264 is extended, the yoke 262 pushes the push-pull rod 261 to move forward along with the extension of the push rod 264, and then drives the plug door 22 to move forward until being blocked by the limiting block 266.

[0058] The second stage is that the plug door is sealed.

[0059] After the plug door 22 is closed, the push rod 264 of the hydraulic oil cylinder 263 continues to extend forward, the front end of the push-pull rod 261 continues to extend out of the bent plate 221 of the plug door 22, the yoke 262 compresses the first spring 265 on the push-pull rod 261, at the same time, the rear end of the yoke 262 starts to push the upper cross beam 277 to move forward, and the upper cross beam 277 drives the transmission rod 271 to move forward by overcoming the resistance of the second spring 276. Thus, the transmission rod 271 drives the transmission disc 273 to rotate through the connecting rod 272, the transmission disc 273 drives the concentric shaft 274 to rotate, the concentric shaft 274 drives the eccentric bearing 275 to rotate, the far side of the eccentric bearing 275 moves upward, the plug door 22 is lifted upward, and the discharge port is continuously pressed downward, and finally the discharge port is sealed.

[0060] The third stage is that the residual amount of the push rod of the hydraulic oil cylinder is released.

[0061] When the plug door 22 is pressed upward to the limit, the eccentric bearing 275 cannot rotate any more, so the concentric shaft 274 and the transmission disc 273 cannot continue to rotate, and the transmission rod 271 cannot move forward any more. At this time, the push rod 264 of the hydraulic cylinder 263 still has a surplus amount of forward extension, so the second spring 276 between the upper cross beam 277 and the transmission rod 271 is compressed. By selecting the elastic coefficient of the second spring 276, the eccentric bearing 275 will not continue to rotate during the compression of the second spring 276. Thus, the surplus amount of the push rod of the hydraulic cylinder is released, so that the push rod of the hydraulic cylinder is fully extended and will not damage other components.

[0062] The retraction of the plug door 22 is relatively simple. The hydraulic cylinder 263 is reversed to supply oil, the push rod 264 is retracted to move backward, and the transmission rod 271, the transmission disc 273, the concentric shaft 274 and the eccentric bearing 275 will no longer be subjected to the upward force from the hydraulic cylinder 263, and will return to the original position under the action of the return spring 278. The push rod 264 of the hydraulic cylinder 263 continues to move backward, the push-pull rod 261 is pulled backward by the yoke 262, and the plug door 22 moves backward until the push rod 264 of the hydraulic cylinder 263 is fully retracted and the plug door 22 is fully opened.

[0063] In combination with the description of the above specific embodiments, the automatic valve device for the separate discharge of solid materials in a positive pressure air duct provided by the present application has the following advantages compared with the prior art:

[0064] First, the two plug doors are opened and closed alternately, so that only a small amount of high-pressure air is discharged with the materials, which has the effect of isolating the positive pressure air.

[0065] Second, the square discharge port is adopted, and the cross section of the discharge port is processed into a bevel, which can prevent the materials from being stuck on the contact surface when the plug door is in contact with the discharge port, thereby improving the sealing effect.

[0066] Third, a bracket and a guide rail are arranged between the plug door and the discharge port to ensure that the plug door moves within a limited space. The circular pipe is used as the rail to ensure smooth sliding of the plug door, and to prevent the materials falling from the discharge port from accumulating in the rail bracket and affecting the sliding of the plug door.

[0067] Fourth, the mechanical sealing mechanism composed of the eccentric bearing and the transmission disc pushes the eccentric bearing below the plug door upward after the plug door is closed, so that the plug door is tightly sealed with the discharge port, thereby achieving the effects of anti-sticking and sealing.

[0068] Fifth, the second spring is connected between the upper cross beam and the transmission rod, which can release the surplus amount of the push rod of the hydraulic cylinder, so that the push rod of the hydraulic cylinder is fully extended and will not damage other components.

[0069] Finally, it is to be understood that the term "including", "comprising", and any other variation thereof, as used in this document, is intended to cover the case of non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to those elements, but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises a... " does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0070] The present application is not limited to the above-described best mode, and anyone should know that any structural changes made under the inspiration of the present application, any technical solutions with the same or similar to the present application, fall within the protection scope of the present application.

Claims

1. An automatic valve device suitable for the separate discharge of solid materials in a positive pressure duct, comprising a housing, characterized in that, The inner cavity of the shell is divided into an independent upper chamber and a lower chamber by a partition device. The bottom of the upper chamber and the lower chamber are respectively provided with an upper discharge port and a lower discharge port. Both the upper discharge port and the lower discharge port are square discharge ports, and the lower end faces are inclined bevels. Automatic insertion gate devices are provided at the upper discharge port and the lower discharge port respectively. The two sets of automatic insertion gate devices are controlled by a control device to open and close alternately. The automatic door insertion device includes: The bracket is fixed to the housing; The insert gate is located below the discharge port and has the same inclination angle as the bevel of the discharge port. The insert gate is slidably mounted on the bracket. The opening and closing mechanism includes a push-pull rod, a shift fork, and a hydraulic cylinder. The hydraulic cylinder is fixed to the rear end of the bracket and has a telescopic push rod. The push rod is fixed to the upper end of the shift fork. The front end of the push-pull rod is slidably disposed on the insert door. The rear end of the push-pull rod is fixedly connected to the lower end of the shift fork. A first spring is sleeved on the push-pull rod and abuts against the insert door and the shift fork respectively. The automatic door insertion device also includes a mechanical sealing mechanism, comprising: A concentric shaft is located below the insert plate, and its axis is perpendicular to the direction of movement of the insert plate door. The concentric shaft is rotatably mounted on the bracket. Two transmission discs are fixed at both ends of the concentric shaft, and eccentric bearings are provided at both ends of the concentric shaft. The two eccentric bearings are located on the inner side of the transmission discs and are arranged corresponding to the edges of the two sides of the slide door. Two transmission rods are slidably mounted on the bracket; the front ends of the two transmission rods are fixed by the lower crossbeam, and the rear ends of the two transmission rods are connected to the upper crossbeam by the second spring. There is a compression allowance of the second spring between the upper crossbeam and the rear ends of the transmission rods. The upper crossbeam is arranged opposite to the push rod of the hydraulic cylinder. Two connecting rods, with their rear ends hinged to the middle of the transmission rod and their front ends hinged to the transmission disc; When the slide gate pushes the feed inlet upward to its limit and the transmission rod can no longer move forward, the push rod of the hydraulic cylinder extends forward and the second spring is compressed, releasing the remaining amount of the push rod of the hydraulic cylinder.

2. The automatic valve device for separate discharge of solid materials in a positive pressure duct according to claim 1, characterized in that, The bracket has upright plates at both ends corresponding to the insert door. Each upright plate has a sliding groove corresponding to the insert door. A round tube is fixed on the lower wall of each sliding groove. The two round tubes are located at the two side edges of the insert door, forming a sliding rail for the insert door to move.

3. The automatic valve device for separate discharge of solid materials in a positive pressure duct as described in claim 1, characterized in that, The front end of the bracket is also provided with a limiting block to limit the closing position of the insert door.

4. The automatic valve device for separate discharge of solid materials in a positive pressure duct as described in claim 1, characterized in that, The bracket is also equipped with a return spring. One end of the return spring is fixed to the bracket, and the other end is connected to the transmission rod. It is used to reset the transmission rod when the push rod of the hydraulic cylinder retracts.

5. The automatic valve device for separate discharge of solid materials in a positive pressure duct according to claim 1, characterized in that, The lower parts of the upper chamber and the lower chamber are conical.

6. The automatic valve device for separate discharge of solid materials in a positive pressure duct according to claim 3, characterized in that, The transmission disc is provided with multiple pins along its circumference, and the front end of the connecting rod is hinged to one of the pins.

7. The automatic valve device for separate discharge of solid materials in a positive pressure duct according to claim 1, characterized in that, The rear end of the door panel is provided with a downwardly bent plate, and the bent plate has a through hole. The front end of the push-pull rod is inserted into the through hole on the bent plate and can slide along the through hole.

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