Small sieve sampling device

Abstract

The invention discloses a small sieve sampling device in the field of coal processing, and the small sieve sampling device comprises a screening assembly which comprises a vertically placed small sieve and an air locker, and the small sieve is connected with the air locker through a powder conveying pipe; the sampling assembly comprises a feeding pipeline connected with the powder conveying pipe located above the small sieve, a discharging pipeline connected with the powder conveying pipe located below the small sieve, and a sampling chamber connected with the feeding pipeline and the discharging pipeline. The pulverized coal sampling device has the beneficial effects that the channel for sampling is additionally arranged beside the pulverized coal screening channel, a worker can directly collect pulverized coal from the sampling channel, and can control the opening and closing of the sampling channel at any time, so that the safety of the worker is guaranteed, and meanwhile, the sampling efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the field of coal processing, in particular to a small sieve sampling device. Background Art

[0002] At present, in the central storage pulverizing system of power plants, the coal powder fineness test requires sampling and testing of the coal powder after being ground by the pulverizer at the small sieve of the coal conveying auger. The sampling process requires the operator to place the sampling container inside the small sieve by himself to collect the coal powder that falls from the fine powder separator through the powder conveying pipe.

[0003] The small sieve is a rotating machine that is always in a fast-rotating state. The operating personnel need to place the sampling container on the anti-debris net inside the small sieve, and there is a risk of personal injury caused by being caught by the protective net and being drawn into the rotating machinery; the coal powder that falls through the fine powder separator has a high temperature, and there is also a risk of scalding when the operating personnel place the container; the coal powder that falls through the fine powder separator will also be mixed with some debris, which will affect the sampling accuracy, and some hard debris may cause personal injury; the anti-debris net inside the small sieve is also subject to wear and tear, and there may be holes, and there is a situation where the sampling container is transferred into the powder bin by the powder conveying auger, affecting the safe and stable operation of the unit. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the title of the invention of this application to avoid blurring the purpose of this section, the abstract of the specification and the title of the invention, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the above problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the technical problem to be solved by the present invention is how to make coal powder sampling more convenient.

[0007] To solve the above technical problems, the present invention provides the following technical solutions: a small sieve sampling device, comprising: a screening assembly, including a vertically placed small sieve and an air lock, wherein the small sieve and the air lock are connected via a powder conveying pipe; a sampling assembly, including a feed pipe connected to the powder conveying pipe above the small sieve, a discharge pipe connected to the powder conveying pipe below the small sieve, and a sampling chamber connecting the feed pipe and the discharge pipe.

[0008] As a preferred solution of the small sieve sampling device of the present invention, a filter screen is provided inside the small sieve, and a conical opening is provided at the bottom of the small sieve.

[0009] As a preferred solution of the small sieve sampling device of the present invention, the air lock includes an air lock chamber and a motor connected to the air lock chamber.

[0010] As a preferred solution of the small sieve sampling device of the present invention, a rotating member is provided in the air lock chamber, a plurality of baffles are provided at equal intervals on the outer wall of the rotating member, and a rotating shaft is provided at the center of the rotating member.

[0011] As a preferred solution of the small sieve sampling device of the present invention, wherein: the rotating shaft is connected to the output end of the motor.

[0012] As a preferred solution of the small sieve sampling device of the present invention, the feed pipeline includes a first straight pipe inclined downward and a first curved pipe connected to the first straight pipe, and the first straight pipe is provided with a feed valve.

[0013] As a preferred solution of the small sieve sampling device of the present invention, the discharge pipe includes a second straight pipe inclined upward and a second curved pipe connected to the second straight pipe, and a discharge valve is provided on the second straight pipe.

[0014] As a preferred solution of the small sieve sampling device of the present invention, the first curved pipe and the second curved pipe are connected via a sampling chamber.

[0015] As a preferred solution of the small sieve sampling device of the present invention, a first protective net and a second protective net are provided in the sampling chamber, and the first protective net is located above the second protective net.

[0016] As a preferred solution of the small sieve sampling device of the present invention, the side wall of the sampling chamber is provided with an opening, the height of the lower edge of the opening is higher than the height of the second protective net, and a glass door is provided at the opening.

[0017] The beneficial effects of the present invention are as follows: a sampling channel is added next to the coal powder screening channel, and the staff can directly collect the coal powder from the sampling channel and can control the switch of the sampling channel at any time, thereby ensuring the safety of the staff and greatly improving the sampling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0019] Figure 1A schematic diagram of the structure of a small sieve sampling device provided by the present invention;

[0020] Figure 2 A schematic diagram of the structure of an air lock for a small sieve sampling device provided by the present invention;

[0021] Figure 3 A schematic cross-sectional structure diagram of an air lock for a small sieve sampling device provided by the present invention;

[0022] Figure 4 A schematic cross-sectional structure diagram of a sampling assembly of a small sieve sampling device provided by the present invention;

[0023] Figure 5 A schematic diagram of the structure of a sampling chamber of a small sieve sampling device provided by the present invention;

[0024] Figure 6 A schematic cross-sectional structure diagram of a sampling chamber of a small sieve sampling device provided by the present invention. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0028] Furthermore, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0029] Example 1

[0030] Reference Figure 1-6The present embodiment provides a small sieve sampling device, including a screening assembly 100, including a small sieve 101 and an air lock 102 placed vertically, and the small sieve 101 and the air lock 102 are connected by a powder conveying pipe 103; a sampling assembly 200, including a feed pipe 201 connected to the powder conveying pipe 103 located above the small sieve 101, a discharge pipe 202 connected to the powder conveying pipe 103 located below the small sieve 101, and a sampling chamber 203 connecting the feed pipe 201 and the discharge pipe 202.

[0031] Specifically, there are two air lockers 102 with the same structure in the screening assembly 100, which are respectively located on the upper and lower sides of the small sieve 101. The air locker 102 has the function of maintaining the smooth flow of powder particles, and can prevent the air from flowing due to the sudden change of pressure when the coal powder enters the screening assembly 100 from the outside, so as to ensure that the coal powder can be smoothly transported to the small sieve 101.

[0032] Preferably, the small sieve 101 and the air lock 102 are fixed by a powder conveying pipe 103. The small sieve 101 can screen the coal powder to ensure that coal powder with similar particle sizes can be obtained. At the same time, some foreign matter mixed in the coal powder can be blocked by the small sieve 101, and finally coal powder without hard foreign matter can be obtained.

[0033] Furthermore, the feed pipe 201, the sampling chamber 203 and the discharge pipe 202 are connected in sequence, and a sampling pipe can be added between the two powder conveying pipes 103, so that the coal powder entering the screening assembly 100 can be sampled and analyzed at any time. There is no need to extend the sampler into the small sieve 101, which greatly simplifies the sampling operation process and avoids contact with the small sieve 101, thereby ensuring the safety of the staff.

[0034] Example 2

[0035] Reference Figure 2-4 , which is the second embodiment of the present invention, is based on the previous embodiment, and is different from the previous embodiment in that: a filter screen 101a is provided inside the small sieve 101, and a conical opening 101b is provided at the bottom of the small sieve 101; the air lock 102 includes an air lock chamber 102a and a motor 102b connected to the air lock chamber 102a. A rotating member 102c is provided inside the air lock chamber 102a, and a plurality of baffles 102c-1 are provided at equal intervals on the outer wall of the rotating member 102c, and a rotating shaft 102c-2 is provided at the center of the rotating member 102c. The rotating shaft 102c-2 is connected to the output end 102b-1 of the motor 102b.

[0036] Specifically, the filter screen 101a in the small sieve 101 can block larger coal powder particles and hard foreign matter mixed in the coal powder, ensuring that the composition and properties of the coal powder entering the powder bin through the air lock 102 below remain unchanged, and the design of the conical mouth 101b at the bottom of the small sieve 101 makes it easier for the coal powder to be discharged and avoids the accumulation of coal powder in the small sieve.

[0037] Preferably, the air lock chamber 102a can be divided into several independent areas by the baffle 102c-1 on the outside of the rotating part 102c. When the coal powder is poured between the two baffles, the rotating shaft 102c-2 is driven to rotate by the motor 102b, so that the coal powder enters the air lock chamber 102a and is isolated from the external air pressure until the area where the coal powder is located is connected to the powder conveying pipe 103 at the bottom of the air lock 102, and the coal powder enters the small sieve 101 through the powder conveying pipe 103 under the action of gravity.

[0038] In this embodiment, the pulverized coal can be filtered through the screening assembly 100, and the upper and lower air locks 102 can ensure that the pulverized coal falls stably in the vertical direction without the pulverized coal running around, thereby reducing the possibility of pulverized coal leakage.

[0039] Example 3

[0040] Reference Figure 4-6 , which is the third embodiment of the present invention, this embodiment provides a small sieve sampling device, which is based on the previous embodiment, and is different from the previous embodiment in that: the feed pipe 201 includes a first straight pipe 201a inclined downward and a first curved pipe 201b connected to the first straight pipe 201a, and the first straight pipe 201a is provided with a feed valve 201a-1. The discharge pipe 202 includes a second straight pipe 202a inclined upward and a second curved pipe 202b connected to the second straight pipe 202a, and the second straight pipe 202a is provided with a discharge valve 202a-1. The first curved pipe 201b and the second curved pipe 202b are connected through a sampling chamber 203. A first protective net 203a and a second protective net 203b are provided in the sampling chamber 203, and the first protective net 203a is located above the second protective net 203b. An opening 203c is provided on the side wall of the sampling chamber 203. The height of the lower edge of the opening 203c is higher than the height of the second protective net 203b. A glass door 203d is provided at the opening 203c.

[0041] Specifically, the feed valve 201a-1 is used to control the switch of the feed pipe 201, and the discharge valve 202a-1 is used to control the switch of the discharge pipe 202. When the coal powder sampling test is performed, the glass door 203d of the sampling chamber 203 is first opened, and the container for collecting coal powder is placed on the second protective net 203b, and then the discharge valve 202a-1 is opened to connect the powder conveying pipe 103 below the small sieve 101 with the discharge pipe 202. At this time, the feed valve 201a-1 is opened again to allow the air in the sampling assembly 200 to circulate, and the part of the powder conveying pipe 103 above that falls is discharged. The coal powder enters the first straight pipe 201a. Since the first straight pipe 201a is inclined downward, the coal powder will slide smoothly along the first straight pipe 201a, and then enter the sampling chamber 203 through the first curved pipe 201b. The impurities mixed in the coal powder are blocked by the first protective net 203a in the sampling chamber 203. Finally, part of the coal powder falls into the collecting container, and the rest of the coal powder continues to fall along the discharge pipe 202 after passing through the second protective net 203b. Since the inside of the small sieve 101 is in a state of slight negative pressure, even if the discharge valve 202a-1 is not closed, the coal powder will not flow back to the small sieve 101.

[0042] When sampling is completed, first close the feed valve 201a-1, wait for a few minutes, and close the discharge valve 202a-1 after all the coal powder in the sampling chamber 203 and the discharge pipe 202 is discharged to prevent the residual coal powder in the sampling chamber 203 from affecting the next sampling result. Finally, open the glass door 203d to take out the sampling vessel to complete the sampling process.

[0043] By providing the sampling device, the safety of the sampling process can be improved, the personal safety of the staff can be protected, and at the same time the operations required for sampling can be greatly reduced, thereby improving the sampling efficiency.

[0044] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to several modifications still falling within the scope of the appended claims.

[0045] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0046] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0047] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A small sieve sampling device, characterized in that: include, The screening assembly (100) comprises a small screen (101) and an air lock (102) placed vertically, wherein the small screen (101) and the air lock (102) are connected via a powder conveying pipe (103); The sampling assembly (200) comprises an inlet pipe (201) connected to the powder conveying pipe (103) at one end of the small sieve (101), an outlet pipe (202) connected to the powder conveying pipe (103) at the other end of the small sieve (101), and a sampling chamber (203) connecting the inlet pipe (201) and the outlet pipe (202).

2. The small sieve sampling device according to claim 1, characterized in that: A filtering screen (101a) is provided inside the small sieve (101), and a conical opening (101b) is provided at the bottom of the small sieve (101).

3. The small sieve sampling device according to claim 2, characterized in that: The air lock (102) comprises an air lock chamber (102a) and a motor (102b) connected to the air lock chamber (102a).

4. The small sieve sampling device according to claim 3, characterized in that: A rotating member (102c) is provided in the air lock chamber (102a), a plurality of baffles (102c-1) are provided at equal intervals on the outer wall of the rotating member (102c), and a rotating shaft (102c-2) is provided at the center of the rotating member (102c).

5. The small sieve sampling device according to claim 4, characterized in that: The rotating shaft (102c-2) is connected to the output end (102b-1) of the motor (102b).

6. The small sieve sampling device according to claim 5, characterized in that: The feed pipe (201) comprises a first straight pipe (201a) inclined downward and a first curved pipe (201b) connected to the first straight pipe (201a), and the first straight pipe (201a) is provided with a feed valve (201a-1).

7. The small sieve sampling device according to claim 6, characterized in that: The discharge pipe (202) comprises a second straight pipe (202a) inclined upward and a second curved pipe (202b) connected to the second straight pipe (202a), and a discharge valve (202a-1) is provided on the second straight pipe (202a).

8. The small sieve sampling device according to claim 7, characterized in that: The first curved pipe (201b) and the second curved pipe (202b) are connected via a sampling chamber (203).

9. The small sieve sampling device according to claim 8, characterized in that: A first protective net (203a) and a second protective net (203b) are provided in the sampling chamber (203), and the first protective net (203a) is located above the second protective net (203b).

10. The small sieve sampling device according to claim 9, characterized in that: The side wall of the sampling chamber (203) is provided with an opening (203c), the lower edge height of the opening (203c) is higher than the height of the second protective net (203b), and a glass door (203d) is provided at the opening (203c).

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