Safe feeding device for small-dose auxiliary chemicals

Abstract

The utility model relates to the technical field of small-dose feeding, in particular to a small-dose type chemical auxiliary agent safe feeding device which comprises a feeding hopper, a flange plate is arranged below the feeding hopper, a through hole is formed in the flange plate, the bottom of the feeding hopper is fixedly connected with a discharging pipe capable of sliding up and down in the through hole, and the feeding pipe is fixedly connected with the feeding hopper. A through hole is formed in the flange plate, a sealing piece used for conducting sliding sealing on the discharging pipe is installed in the through hole of the flange plate, a discharging butterfly valve is installed on the discharging pipe, the discharging pipe is sleeved with an elastic piece used for conducting elastic supporting on the feeding hopper, and a gas purging part is arranged on the feeding hopper. According to the chemical auxiliary feeding device, gas blowing can be provided for the feeding hopper in the chemical auxiliary feeding process, the gas can blow and remove part of residual auxiliary in the feeding hopper and a pipeline, materials can smoothly enter a reaction kettle, insufficient feeding caused by the fact that the chemical auxiliary adheres to the wall is avoided, and meanwhile inert protection can be conducted on the chemical auxiliary through the gas.

Description

Technical Field

[0001] The utility model relates to the field of small-dose feeding, in particular to a safe feeding device for small-dose chemical additives. Background Technique

[0002] In the process of fine chemical production, it involves the addition of additives with multiple frequencies and small doses, and small-dose additives play a decisive role in chemical reactions.

[0003] If traditional large-dose feeding methods are used for small-dose chemical additives, the chemical additives will adhere to the wall. Because the feeding amount is small, if they adhere to the wall, it cannot ensure that the chemical additives are fed into the reaction system in sufficient quantity, which will inevitably affect the product quality and product yield.

[0004] At present, double-valve control is mostly used for feeding small-dose additives, but this method also has the problems of additive wall adhesion and feeding dead angles, and cannot ensure that the chemical additives are fed into the reaction system in sufficient quantity. Moreover, it cannot be well sealed during the feeding process, so that the flammable, explosive, toxic and harmful gases generated by the reaction of the chemical additives with the materials in the reaction kettle during the feeding process will escape. The escaped gases may cause fires, explosions, personnel poisoning and environmental pollution when encountering a fire source. To solve the above problems, we propose a safe feeding device for small-dose chemical additives. Summary of the Invention

[0005] In view of this, the purpose of the utility model is to propose a safe feeding device for small-dose chemical additives to solve the problems that the existing feeding device is prone to wall adhesion and poor sealing when feeding small-dose chemical additives.

[0006] Based on the above purpose, the utility model provides a safe feeding device for small-dose chemical additives, including a feeding hopper. A flange is provided below the feeding hopper, and through holes are opened on the flange. A feeding pipe that can slide up and down in the through hole is fixedly connected to the bottom of the feeding hopper. A sealing member for sliding and sealing the feeding pipe is installed in the through hole of the flange, and a discharge butterfly valve is installed on the feeding pipe. An elastic member for elastically supporting the feeding hopper is sleeved on the feeding pipe;

[0007] A gas purging part is provided on the feeding hopper. When feeding small-dose chemical additives into the reaction kettle, the gas purging part is used to purge the residual chemical additives in the feeding hopper, the feeding pipe and the discharge butterfly valve on the one hand, and is used for inert protection of the chemical additives on the other hand.

[0008] Preferably, it further includes a ball valve, and the ball valve is detachably installed on the flange through bolts and nuts.

[0009] Preferably, a sealing cover is provided on the feeding hopper, and the sealing cover is threadedly connected to the feeding hopper.

[0010] Preferably, the sealing member is an O-ring, and the O-ring is installed in the through hole to improve the sealing performance between the blanking pipe and the through hole.

[0011] Preferably, the elastic member is a spring. The spring is sleeved on the blanking pipe. The top end of the spring is connected to the lower surface of the discharge butterfly valve, and the bottom end of the spring is connected to the upper surface of the flange.

[0012] Preferably, the gas purging part includes a gas supply hose installed on the side of the feeding hopper. A nitrogen valve is installed on the gas supply hose, and the gas supply hose is connected to an external nitrogen supply device.

[0013] Preferably, the nitrogen valve is a 0.02 MPa micro-pressure nitrogen valve.

[0014] The beneficial effects of the present utility model: The small-dose chemical additive safety feeding device provided by the present utility model can move the blanking pipe into the reaction kettle when feeding small-dose chemical additives, and at the same time performs sliding sealing on the blanking pipe, avoiding the escape of toxic and harmful gases generated during the feeding of chemical additives from the blanking pipe and the through hole; during the feeding of chemical additives, gas purging can be provided to the feeding hopper. During the purging process, the gas can provide inert protection to the chemical additives. During the purging process, the gas can purge and remove part of the residual additives in the feeding hopper and the pipeline, enabling the material to smoothly enter the reaction kettle, avoiding the sticking of chemical additives to the wall and resulting in insufficient feeding, ensuring that the added additives are added to the reaction system in sufficient quantity and effectively, and the operation is convenient, safe and reliable. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is the front view of the embodiment of the present utility model;

[0017] Figure 2 It is the partial cross-sectional view of the flange and the blanking pipe of the embodiment of the present utility model.

[0018] In the figure: 1, feeding hopper; 2, flange; 3, blanking pipe; 4, discharge butterfly valve; 5, ball valve; 6, gas purging part; 61, gas supply hose; 62, nitrogen valve; 7, sealing cover; 8, O-ring; 9, spring. Detailed implementation mode

[0019] To make the purpose, technical solution and advantages of the present utility model clearer and more understandable, the following further details the present utility model in combination with specific embodiments and with reference to the accompanying drawings.

[0020] It should be noted that unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present utility model should have the ordinary meaning understood by those with ordinary skills in the field to which the present utility model belongs. The "first", "second" and similar words used in the present utility model do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. "Connection" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right", etc. are only used to represent relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0021] As Figure 1 、 Figure 2 As shown, a small-dose chemical additive safe feeding device includes a feeding hopper 1. A flange 2 is arranged below the feeding hopper 1, and a through hole is opened on the flange 2. A feeding pipe 3 that can slide up and down in the through hole is fixedly connected to the bottom of the feeding hopper 1. A sealing member for slidingly sealing the feeding pipe 3 is installed in the through hole of the flange 2, and a discharge butterfly valve 4 is installed on the feeding pipe 3. An elastic member for elastically supporting the feeding hopper 1 is sleeved on the feeding pipe 3;

[0022] A gas purging part 6 is arranged on the feeding hopper 1. When feeding small-dose chemical additives into the reaction kettle, on the one hand, the gas purging part 6 is used to purge the residual chemical additives in the feeding hopper 1, the feeding pipe 3 and the discharge butterfly valve 4, and on the other hand, it is used to provide inert protection for the chemical additives.

[0023] When it is necessary to add small-dose chemical additives into the reaction kettle, the flange 2 can be first installed at the feed port of the reaction kettle, and then the weighed chemical additives are added into the feeding hopper 1. The feeding pipe 3 is moved downward so that the feeding pipe 3 passes through the flange 2 and extends into the reaction kettle. Under the action of the sealing member, the feeding pipe 3 is slidingly sealed. Subsequently, the discharge butterfly valve 4 is opened and the gas purging part 6 is started. Under the action of gas purging, the residual chemical additives in the feeding hopper 1, the feeding pipe 3 and the discharge butterfly valve 4 can be blown into the reaction kettle, so that the chemical additives can smoothly enter the reaction kettle, avoiding insufficient feeding amount caused by the chemical additives sticking to the wall.

[0024] In a preferred embodiment of the present utility model, it further includes a ball valve 5, and the ball valve 5 is detachably installed on the flange 2 through bolts and nuts.

[0025] The ball valve 5 is installed at the feed inlet of the reactor and serves as the interface valve of the reactor. When the ball valve 5 is fully opened, the blanking pipe can pass through the ball valve 5 and enter the reactor. By using a valve to connect with the reactor, the sealing performance between the feeding device and the reactor is ensured, and at the same time, it is convenient to disassemble, clean and inspect the feeding device.

[0026] In another preferred embodiment of the present utility model, a sealing cover 7 is provided on the feeding hopper 1. The sealing cover 7 is threadedly connected to the feeding hopper 1. The threaded connection of the sealing cover 7 to the feeding hopper 1 belongs to the conventional prior art and will not be elaborated here. The sealing cover 7 is used to seal after chemical additives are added to the feeding hopper 1, reducing the contact between the chemical additives in the feeding hopper 1 and the air, and preventing oxidation and moisture absorption.

[0027] In still another preferred embodiment of the present utility model, the sealing member is an O-ring 8. The O-ring 8 is installed in the through hole to improve the sealing performance between the blanking pipe 3 and the through hole, and an oil seal is also installed in the through hole, which can further perform sliding sealing on the blanking pipe 3.

[0028] When the blanking pipe 3 passes through the ball valve and enters the reactor, the O-ring 8 performs sliding sealing on the blanking pipe 3, preventing the toxic and harmful gases generated during the feeding of chemical additives from escaping from the gap between the blanking pipe 3 and the through hole.

[0029] It should be noted that the elastic member is a spring 9. The spring 9 is sleeved on the blanking pipe 3. The top end of the spring 9 is connected to the lower surface of the discharge butterfly valve 4, and the bottom end of the spring 9 is connected to the upper surface of the flange 2.

[0030] The spring 9 plays an elastic supporting role for the feeding hopper 1, facilitating the downward movement of the blanking pipe 3 against the elastic force of the spring 9. After the chemical additives are added, under the action of the elastic force of the spring 9, it can push the feeding hopper 1 and the blanking pipe 3 to move upward and return to the initial position, and also plays a role in preventing the blanking pipe 3 from being displaced excessively and falling off.

[0031] It should be noted that the gas purging part 6 includes a gas supply hose 61 installed on the side of the feeding hopper 1. A nitrogen valve 62 is installed on the gas supply hose 61, and the gas supply hose 61 is connected to an external nitrogen supply device. The nitrogen valve 62 is a 0.02 MPa micro-pressure nitrogen valve.

[0032] Nitrogen can purge and remove some residual additives in the feeding hopper 1 and the pipeline, enabling the material to smoothly enter the reactor, avoiding insufficient feeding caused by chemical additives sticking to the wall, and at the same time, nitrogen can also provide inert protection for the chemical additives.

[0033] The usage method of this feeding device is as follows: First, close the discharging butterfly valve 4. Then, unscrew the sealing cover 7, put the measured additives into the feeding hopper 1. After the feeding is completed, tighten the threaded sealing cover 7. And during the process of feeding into the feeding hopper 1, it is necessary to wear a mask and protective clothing for personal protection, and feed slowly to reduce floating.

[0034] Next, open the ball valve 5, apply force to the feeding pipe 3 to move the feeding pipe 3 downward and completely pass through the ball valve 5. (In order to enable the additives to be smoothly fed into the reaction kettle, the ball valve 5 must be fully opened, and passing through the ball valve 5 completely is to avoid the situation of additives accumulating or blocking at the ball valve 5).

[0035] Next, open the discharging butterfly valve 4 and open the 0.02 MPa micro-pressure nitrogen valve for purging to enable the material to smoothly enter the reaction kettle. The nitrogen purging removes some residual additives in the feeding hopper 1 and the pipeline, preventing insufficient feeding amount or reaction with other substances from affecting the product quality and production safety. And nitrogen can also provide inert protection for the chemical additives.

[0036] After the feeding is completed, release the force applied to the feeding pipe 3. Under the reset action of the spring force of the spring 9, it can push the feeding hopper 1 and the feeding pipe 3 back to the initial position, close the ball valve, and close the 0.02 MPa micro-pressure nitrogen valve, and the entire feeding process ends.

[0037] Those of ordinary skill in the art should understand that: The discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the present invention is limited to these examples; Under the idea of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, and they are not provided in detail for the sake of brevity.

[0038] The embodiments of the present invention are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, 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 safety feeding device for small-dose chemical additives, characterized in that, It includes a feeding hopper (1). A flange plate (2) is provided below the feeding hopper (1), and through holes are formed in the flange plate (2). A feeding pipe (3) that can slide up and down in the through holes is fixedly connected to the bottom of the feeding hopper (1). A sealing member for sliding-sealing the feeding pipe (3) is installed in the through hole of the flange plate (2), and a discharge butterfly valve (4) is installed on the feeding pipe (3). An elastic member for elastically supporting the feeding hopper (1) is sleeved on the feeding pipe (3). A gas purging part (6) is provided on the feeding hopper (1). When a small dose of chemical auxiliary agent is put into the reaction kettle, the gas purging part (6) is used to purge the residual chemical auxiliary agent in the feeding hopper (1), the feeding pipe (3) and the discharge butterfly valve (4) on the one hand, and is used to inertly protect the chemical auxiliary agent on the other hand.

2. The small-dose chemical auxiliary safe feeding device according to claim 1, characterized in that, It further includes a ball valve (5), and the ball valve (5) is detachably installed on the flange plate (2) by bolts and nuts.

3. A small-dose chemical additive safe feeding device according to claim 1, characterized in that, A sealing cover (7) is provided on the feeding hopper (1), and the sealing cover (7) is threadedly connected to the feeding hopper (1).

4. A small-dose chemical additive safety feeding device according to claim 1, characterized in that, The sealing member is an O-ring (8), and the O-ring (8) is installed in the through hole to improve the sealing performance between the feeding pipe (3) and the through hole.

5. The small-dose chemical auxiliary safety feeding device according to claim 1, characterized in that, The elastic member is a spring (9), the spring (9) is sleeved on the feeding pipe (3), the top end of the spring (9) is connected to the lower surface of the discharge butterfly valve (4), and the bottom end of the spring (9) is connected to the upper surface of the flange plate (2).

6. The small-dose chemical additive safe feeding device according to claim 1, wherein, The gas purging part (6) includes a gas supply hose (61) installed on the side of the feeding hopper (1). A nitrogen valve (62) is installed on the gas supply hose (61), and the gas supply hose (61) is connected to an external nitrogen supply device.

7. A small-dose chemical additive safety feeding device according to claim 6, characterized in that, The nitrogen valve (62) is a 0.02 MPa micro-pressure nitrogen valve.

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