Limestone powder pneumatic conveying and impurity removing device

Abstract

The utility model discloses a pneumatic conveying and impurity removing device for limestone powder, relates to the technical field of separation of solids from the solids, and aims at separating scrap iron and other large-particle-size impurities in the limestone powder through a physical method. According to the technical scheme, the pneumatic conveying and impurity removing device for the limestone powder comprises an impurity removing pipe, a feeding pipe and a discharging pipe, the feeding pipe and the discharging pipe are connected to the two ends of the impurity removing pipe, connectors are arranged at the ends, back to the impurity removing pipe, of the feeding pipe and the discharging pipe respectively, and a magnet and a filter screen are sequentially arranged in the impurity removing pipe in the flowing direction of the limestone powder. The magnets are fixedly installed on the outer side and / or the interior of the impurity removal pipe, the filter screens are fixedly installed in the impurity removal pipe, the filter screens are arranged on the whole cross section of the impurity removal pipe, a manhole is formed in the pipe wall of the impurity removal pipe, and a sealing cover used for opening and closing the manhole is arranged at the manhole. The device is used for separating scrap iron and other large-particle-size impurities in limestone powder.

Description

Technical Field

[0001] The utility model relates to the technical field of separating solid from solid, in particular to a device for separating impurities from limestone powder conveyed by pneumatic means. Background Art

[0002] Limestone powder is generally transported by tank trucks. The limestone powder in the tank truck is pumped into the silo and then pneumatically conveyed through the ash discharge valve to the use location, such as to the slurry tank for slurry preparation. In order to accurately control the proportion of limestone powder, the impeller clearance of the ash discharge valve is very small, usually less than one millimeter. During the crushing and transportation of limestone, small iron blocks, iron sheets, welding rod heads, cigarette butts and other impurities are mixed into it. If these impurities are not removed, the larger impurities in the limestone powder will block the ash discharge valve, affecting the normal operation of the ash discharge valve. Utility Model Content

[0003] The utility model provides a limestone powder pneumatic conveying and impurity removal device, which aims to separate iron filings and other large-size impurities in the limestone powder by a physical method.

[0004] The technical scheme adopted by the utility model is: a pneumatic conveying and impurity removal device for limestone powder, comprising an impurity removal pipe and a feed pipe and an outlet pipe connected to both ends of the impurity removal pipe, joints are respectively arranged at one end of the feed pipe and the outlet pipe facing away from the impurity removal pipe, magnets and filter screens are successively arranged inside the impurity removal pipe along the flow direction of the limestone powder, the magnets are fixedly installed on the outside and / or inside of the impurity removal pipe, the filter screens are respectively fixedly installed in the impurity removal pipe, the filter screens are at least one layer, and the filter screens are arranged in the entire cross-section of the impurity removal pipe, an inspection hole is arranged on the pipe wall of the impurity removal pipe, and a sealing cover for opening and closing the inspection hole is arranged at the inspection hole.

[0005] The feed pipe and the impurity removal pipe can be an integral whole or can be sealed and connected via a joint; the impurity removal pipe and the discharge pipe can be an integral whole or can be sealed and connected via a joint.

[0006] In order to facilitate the connection of the feed pipe and the discharge pipe to the pipeline for pneumatic conveying of limestone powder, further, the joints of the feed pipe and the discharge pipe at one end facing away from the impurity removal pipe are flanges.

[0007] Furthermore, the center lines of the feed pipe, the impurity removal pipe and the discharge pipe coincide and are all circular pipes, the inner diameters of the feed pipe and the discharge pipe are equal, the inner diameter of the impurity removal pipe is larger than the inner diameter of the feed pipe, a reducer is arranged at the downstream end of the impurity removal pipe, the three-dimensional figure corresponding to the reducer is a truncated cone, the reducer is connected to the discharge pipe, the magnet is arranged on the inner wall of the impurity removal pipe, and the filter is arranged in the reducer.

[0008] In order to ensure the magnet's adsorption and interception effect on magnetic impurities in limestone powder, and at the same time reduce the magnet's obstruction to pneumatic conveying, further: the magnet is a magnetic rod, there are at least two magnetic rods, each magnetic rod is fixedly installed on the inner wall of the impurity removal pipe, and the center line direction of the magnetic rod is parallel to the center line direction of the impurity removal pipe, and the center angles corresponding to the center line of any two adjacent magnetic rods and the impurity removal pipe are equal.

[0009] To facilitate the installation of the magnetic rod, further: the magnetic rod can be directly fixed on the inner wall of the impurity removal pipe, or at least two annular brackets are provided inside the impurity removal pipe, the brackets are provided with mounting holes adapted to the magnetic rods, the outer diameter of the brackets is adapted to the inner diameter of the impurity removal pipe, and each magnetic rod is installed in the mounting holes of at least two brackets.

[0010] In order to facilitate the arrangement of the sealing cover, further: an inspection hole is set on the side wall of the debris removal pipe, an inspection pipe is set outside the inspection hole, and a sealing cover that can open and close the inspection pipe is set at one end of the inspection pipe away from the debris removal pipe.

[0011] In order to quickly open and close the inspection pipe, further: the sealing cover includes an outer cover and an inner cover fixedly arranged on the inner side of the outer cover, one of the two opposite sides of the outer cover is hinged to the inspection pipe, and a locking mechanism is arranged between the other side and the inspection pipe.

[0012] The beneficial effect of the utility model is as follows: under the action of airflow, limestone powder enters the impurity removal pipe through the feed pipe, and magnetic impurities such as iron filings, iron blocks, iron sheets, welding rods, etc. in the limestone powder are adsorbed and intercepted by the magnet, and other large-size impurities in the limestone powder are intercepted by the filter screen, thereby removing impurities in the limestone powder by physical means, and preventing the magnetic impurities from damaging the filter screen. The pneumatic conveying and impurity removal device for limestone powder is arranged in the upstream direction of the ash discharge valve, which can prevent the ash discharge valve from being stuck by impurities, thereby ensuring the normal operation of the ash discharge valve. The pipe wall of the impurity removal pipe is provided with an inspection hole and a sealing cover. After the pneumatic conveying stops, the sealing cover is opened, and the magnetic impurities adsorbed by the magnet can be cleaned through the inspection hole, and the impurities filtered out by the filter screen can be cleaned at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model is a structural schematic diagram of an embodiment of a pneumatic conveying and impurity removing device for limestone powder.

[0014] Figure 2 yes Figure 1 Schematic diagram of the positional relationship between the magnetic rod and the bracket in the illustrated embodiment.

[0015] Figure numerals: feed pipe 1, impurity removal pipe 2, discharge pipe 3, filter screen 4, magnetic bar 5, bracket 6, maintenance pipe 7, outer cover 81, inner cover 82, locking mechanism 9. DETAILED DESCRIPTION

[0016] The utility model will be further described below in conjunction with the accompanying drawings.

[0017] like Figure 1 As shown, the utility model limestone powder pneumatic conveying impurity removal device comprises an impurity removal pipe 2 and a feed pipe 1 and a discharge pipe 3 connected to both ends of the impurity removal pipe 2, and the feed pipe 1, the impurity removal pipe 2 and the discharge pipe 3 are connected in series in sequence. The feed pipe 1 and the impurity removal pipe 2 can be a whole, or can be sealed and connected by a joint; the impurity removal pipe 2 and the discharge pipe 3 can be a whole, or can be sealed and connected by a joint. Joints are respectively provided at the ends of the feed pipe 1 and the discharge pipe 3 facing away from the impurity removal pipe 2, which are used for the feeding and discharging of limestone powder respectively. In order to facilitate the feed pipe 1 and the discharge pipe 3 to be respectively connected to the pipeline for pneumatic conveying of limestone powder, the joints at the ends of the feed pipe 1 and the discharge pipe 3 facing away from the impurity removal pipe 2 are flanges respectively. The diameters of the feed pipe 1 and the discharge pipe 3 are preferably equal, and the joint at the end of the feed pipe 1 facing away from the impurity removal pipe 2 is preferably the same as the joint at the end of the discharge pipe 3 facing away from the impurity removal pipe 2, so that the feed pipe 1 and the discharge pipe 3 can be respectively connected to the pipeline for pneumatic conveying of limestone powder.

[0018] Inside the impurity removal pipe 2, magnets and filter screens 4 are successively arranged along the flow direction of the limestone powder. The filter screens 4 are fixedly installed in the impurity removal pipe 2, and there is at least one layer of the filter screen 4. The filter screen 4 is arranged in the entire cross section of the impurity removal pipe 2. The magnet is used to absorb and intercept magnetic impurities such as iron filings, iron blocks, iron sheets, welding rods, etc. in the limestone powder. The filter screen 4 is used to intercept other large-particle impurities in the limestone powder. The limestone powder enters the impurity removal pipe 2, first enters the tube cavity corresponding to the magnet, and then passes through the filter screen 4 to enter the discharge pipe 3. The magnet is fixedly installed on the outside or inside of the impurity removal pipe 2, or is installed on the outside and inside of the impurity removal pipe 2 at the same time. If the magnet is only installed on the outside of the impurity removal pipe 2, the influence of the magnet on the flow of the limestone powder can be avoided, but the impurity removal pipe 2 will reduce the magnetic field strength formed by the magnet inside the impurity removal pipe 2. If the magnet is only installed inside the impurity removal pipe 2, it is conducive to the larger magnetic field strength formed by the magnet inside the impurity removal pipe 2, but the magnet will have a certain influence on the flow of the limestone powder. The magnets are preferably evenly arranged around the impurity removal tube 2, and the distribution of the magnets in the impurity removal tube 2 is based on the appropriate magnetic field strength formed inside the impurity removal tube 2. For example, see Figure 1 and Figure 2, the magnet is a magnetic rod 5, there are at least two magnetic rods 5, each magnetic rod 5 is fixedly installed on the inner wall of the impurity removal tube 2, and the center line direction of the magnetic rod 5 is parallel to the center line direction of the impurity removal tube 2. The magnetic rod 5 can be directly fixedly installed on the inner wall of the impurity removal tube 2, for example, the inner wall of the impurity removal tube 2 is provided with a slot or buckle for fixing the magnetic rod 5; or, two or more annular brackets 6 are provided inside the impurity removal tube 2, and the brackets 6 are provided with mounting holes adapted to the magnetic rods 5, and the outer diameter of the brackets 6 is adapted to the inner diameter of the impurity removal tube 2, and each magnetic rod 5 is installed in the mounting holes of at least two brackets 6. It is best that the magnetic rods 5 are evenly arranged, that is, the center angles corresponding to the center lines of any two adjacent magnetic rods 5 and the impurity removal tube 2 are equal. Figure 1 In the example shown, two annular brackets 6 are arranged inside the impurity removal pipe 2, and there are six magnetic bars 5, and the two ends of each magnetic bar 5 are respectively inserted into the mounting holes of the two brackets 6. In order for the limestone powder to flow smoothly in the field, the center lines of the feed pipe 1, the impurity removal pipe 2 and the discharge pipe 3 coincide and are all circular pipes, and the inner diameters of the feed pipe 1 and the discharge pipe 3 are equal. Since magnetic impurities such as iron filings, iron blocks, iron sheets, welding rods, etc. may be adsorbed inside the impurity removal pipe 2, in order to reduce the influence of these magnetic impurities on the flow of limestone powder, the inner diameter of the impurity removal pipe 2 is larger than the inner diameter of the feed pipe 1, and a reducer is arranged at the downstream end of the impurity removal pipe 2. The three-dimensional figure corresponding to the reducer is a truncated cone, and the reducer and the discharge pipe 3 are integral or sealed by a joint. When the magnet is arranged inside the impurity removal pipe 2, the magnet is arranged in the non-reducing section of the impurity removal pipe 2, and the filter screen 4 can be arranged in the reducer.

[0019] The wall of the impurity removal pipe 2 is also provided with an inspection hole, and a sealing cover for opening and closing the inspection hole is provided at the inspection hole. The impurity removal pipe 2 is generally a round pipe. In order to facilitate the arrangement of the sealing cover, an inspection hole is provided on the side wall of the impurity removal pipe 2. An inspection pipe 7 is provided on the outside of the inspection hole. The end of the inspection pipe 7 away from the impurity removal pipe 2 is provided with a sealing cover that can open and close the inspection pipe 7. An embodiment of the sealing cover is provided below. In order to quickly open and close the inspection pipe 7, as shown in FIG. Figure 1 As shown, the sealing cover includes an outer cover 81 and an inner cover 82 fixedly arranged on the inner side of the outer cover 81. One of the two opposite sides of the outer cover 81 is hinged to the inspection pipe 7 so that the outer cover 81 can be turned over, and a locking mechanism 9 is arranged between the other side and the inspection pipe 7. The locking mechanism 9 is used to lock the outer cover 81 and the inspection pipe 7. For example, the locking mechanism 9 includes a support fixedly installed on the inspection pipe 7, the support is rotatably connected to the locking bolt, the outer cover 81 is provided with a notch adapted to the locking bolt, and the locking bolt is also provided with an adjusting nut.

Claims

1. Pneumatic conveying and impurity removal device for limestone powder, characterized by: The invention comprises a debris removal pipe (2) and a feed pipe (1) and a discharge pipe (3) connected to both ends of the debris removal pipe (2); a joint is respectively arranged at one end of the feed pipe (1) and the discharge pipe (3) facing away from the debris removal pipe (2); a magnet and a filter screen (4) are successively arranged inside the debris removal pipe (2) along the flow direction of limestone powder; the magnet is fixedly installed on the outside and / or inside of the debris removal pipe (2); the filter screen (4) is respectively fixedly installed inside the debris removal pipe (2); the filter screen (4) has at least one layer; the filter screen (4) is arranged on the entire cross section of the debris removal pipe (2); an inspection hole is arranged on the pipe wall of the debris removal pipe (2); and a sealing cover for opening and closing the inspection hole is arranged at the inspection hole.

2. The limestone powder pneumatic conveying and impurity removal device according to claim 1, characterized in that: The feed pipe (1) and the impurity removal pipe (2) are an integral whole or are sealed and connected via a joint; the impurity removal pipe (2) and the discharge pipe (3) are an integral whole or are sealed and connected via a joint.

3. The limestone powder pneumatic conveying and impurity removal device according to claim 1, characterized in that: The joints of the ends of the feed pipe (1) and the discharge pipe (3) facing away from the impurity removal pipe (2) are flanges respectively.

4. The limestone powder pneumatic conveying and impurity removal device according to claim 1, characterized in that: The center lines of the feed pipe (1), the impurity removal pipe (2) and the discharge pipe (3) coincide and are all circular pipes; the inner diameters of the feed pipe (1) and the discharge pipe (3) are equal; the inner diameter of the impurity removal pipe (2) is larger than the inner diameter of the feed pipe (1); a reducer is arranged at the downstream end of the impurity removal pipe (2); the three-dimensional figure corresponding to the reducer is a truncated cone; the reducer and the discharge pipe (3) are integrally formed or are sealed and connected via a joint; a magnet is arranged on the inner wall of the impurity removal pipe (2); and a filter screen (4) is arranged in the reducer.

5. The limestone powder pneumatic conveying and impurity removal device according to any one of claims 1 to 4, characterized in that: The magnet is a magnetic bar (5), and there are at least two magnetic bars (5). Each magnetic bar (5) is fixedly mounted on the inner wall of the impurity removal pipe (2), and the center line direction of the magnetic bar (5) is parallel to the center line direction of the impurity removal pipe (2), and the center angles corresponding to the center lines of any two adjacent magnetic bars (5) and the impurity removal pipe (2) are equal.

6. The limestone powder pneumatic conveying and impurity removal device according to claim 5, characterized in that: The magnetic bar (5) can be directly fixedly installed on the inner wall of the impurity removal pipe (2), or at least two annular brackets (6) are provided inside the impurity removal pipe (2), the brackets (6) are provided with mounting holes adapted to the magnetic bar (5), the outer diameter of the brackets (6) is adapted to the inner diameter of the impurity removal pipe (2), and each magnetic bar (5) is installed in the mounting holes of at least two brackets (6).

7. The limestone powder pneumatic conveying and impurity removal device according to any one of claims 1 to 4, characterized in that: An inspection hole is provided on the side wall of the impurity removal pipe (2), an inspection pipe (7) is provided outside the inspection hole, and a sealing cover capable of opening and closing the inspection pipe (7) is provided at one end of the inspection pipe (7) away from the impurity removal pipe (2).

8. The limestone powder pneumatic conveying and impurity removal device according to claim 7, characterized in that: The sealing cover comprises an outer cover (81) and an inner cover (82) fixedly arranged on the inner side of the outer cover (81); one of the two opposite sides of the outer cover (81) is hinged to the inspection pipe (7), and a locking mechanism (9) is arranged between the other side and the inspection pipe (7).

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