Filter for jet mill equipment in rare earth permanent magnet industry

Abstract

A filter for jet mill equipment in the rare earth permanent magnet industry comprises a filter upper part, a filter middle part and a filter lower cone, an annular blowback air inlet pipe is arranged at the position, close to the top end, of the upper filter part, a plurality of blowback flow dividing assemblies are arranged on the annular blowback air inlet pipe at intervals, blowback valves are arranged on the blowback flow dividing assemblies, and the air outlet ends of the blowback flow dividing assemblies penetrate through a top cover of the upper filter part and extend into the upper filter part; the interior of the filter upper part is divided into an upper back-blowing chamber and a lower back-blowing chamber through a transverse partition plate, and the lower back-blowing chamber is divided into a plurality of independent and closed sub-chambers through a plurality of vertical partition plates; a flow guide pipe is arranged at the position, opposite to the sub-cavity, of the transverse partition plate, and the inner diameter of the flow guide pipe is of a variable-diameter structure. A filter pipe is arranged at the position, opposite to the sub-chamber, of the middle part of the filter; and back-blowing gas is directly blown to the filter pipe after being pressurized and accelerated by the flow guide pipe. According to the filter, the air pressure of air blown into the filter pipe can be increased, so that the introduction force of back-blowing air is larger, and the back-blowing cleaning effect of the filter is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of metal powder processing device, concretely relates to a filter for airflow mill equipment in rare earth permanent magnet industry. BACKGROUND

[0002] In the production process of the rare earth permanent magnet industry, the airflow mill equipment plays a vital role. The airflow mill equipment grinds the rare earth permanent magnet material through high-speed airflow. In this process, a large amount of dust-containing gas is generated. The filter, as a key component of the airflow mill equipment, mainly filters the dust-containing gas, so that the filtered gas can enter the compressor for recycling.

[0003] With the continuous development of the rare earth permanent magnet industry, the requirement for product quality is increasing, which requires the grinding degree of the airflow mill to be finer and finer in the production process. However, the finer the material is ground, the smaller and more dust particles are generated in the airflow mill equipment, and the dust concentration in the gas increases significantly.

[0004] The conventional filter includes a filter upper part, a filter middle part, a filter lower cone, a pneumatic butterfly valve, and a material reducing tank. The gas blown by the backflush pipe on the filter upper part is blown to the filter pipe in the filter middle part after being divided by the flow dividing plate. This structure of the filter gradually exposes many limitations under the new process requirements. As the process requirements are becoming higher and higher, the powder is becoming finer and finer, and grinding aids are added during the grinding process. The powder is sticky, which makes it difficult for the powder attached to the filter pipe wall to fall off, and a larger amount of introduced gas is required. Therefore, as the rare earth permanent magnet industry develops towards finer material grinding, the existing conventional filter cannot meet the process requirements, and there is an urgent need for a filter with higher filtering efficiency and better backflush effect to meet the needs of industry development and ensure efficient and stable operation in the production process. SUMMARY

[0005] To solve the above technical problems, the utility model provides a filter for airflow mill equipment in rare earth permanent magnet industry, which cancels the original flow dividing plate, sets an upper backflush chamber and a lower backflush chamber on the filter upper part, and the lower backflush chamber is composed of multiple independent sub-chambers. The bottom of the upper backflush chamber is provided with a flow guide pipe corresponding to each sub-chamber. The flow guide pipe, after special design, can increase the air pressure of the gas blown into the filter pipe, increase the introduction force of the backflush gas, clean the dust on the filter pipe in time, and improve the filtering effect.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a kind of filter for rare earth permanent magnet industry airflow mill equipment, including filter upper part, filter middle part, filter lower cone;Wherein, the annular blowback air inlet pipe is equipped in filter upper part in the position close to top end, multiple blowback shunt components are arranged at interval on the annular blowback air inlet pipe, blowback valve is equipped on the blowback shunt component, the air outlet end of blowback shunt component passes through the top cover of filter upper part and extends into filter upper part inside;The inside of filter upper part is separated into upper blowback chamber and lower blowback chamber by transverse partition plate, each described blowback shunt component is communicated with upper blowback chamber;The lower blowback chamber is separated into multiple independent and closed sub-chambers by multiple vertical partition plates;The transverse partition plate is equipped with flow guide pipe in the position opposite to sub-chamber, and independent communication channel is formed between each described sub-chamber and upper blowback chamber by flow guide pipe, the inner diameter of flow guide pipe is variable-diameter structure, the first variable-diameter part of upper end is gradually reduced from top to bottom, the equal-diameter part of middle is constant in inner diameter, the second variable-diameter part of lower end is gradually increased from top to bottom;Filter middle part is equipped with filter pipe in the position opposite to sub-chamber, and blowback gas is directly blown to filter pipe after being pressurized and speeded up by flow guide pipe.

[0008] As the preferred of the utility model, the outside wall of the filter upper part is equipped with multiple mounting brackets at interval in the position close to top end, and the annular blowback air inlet pipe is fixed on the mounting bracket through short tube clamp and nut.

[0009] As the preferred of the utility model, the annular blowback air inlet pipe is connected with blowback main pipe, and a plurality of blowback shunt components are arranged at equal intervals on the annular blowback air inlet pipe, the blowback shunt component includes shunt pipe, bellows, L-shaped turning pipe and nozzle, one end of the shunt pipe is connected with the annular blowback air inlet pipe, the other end is connected with the bellows through clamp and clamp washer, the other end of the bellows is connected with the L-shaped turning pipe through clamp and clamp washer, the other end of the L-shaped turning pipe is connected with the nozzle through clamp and clamp washer, and the L-shaped turning pipe is equipped with blowback valve, and the nozzle is fixed on the top end of the filter upper part and extends into the filter upper part through the top cover of the filter upper part.

[0010] As the preferred of the utility model, the sidewall of the filter middle part is equipped with air inlet interface, the gas containing dust is introduced into the filter through the air inlet interface, the filter middle part and the filter lower cone are integrated structure, and the filter middle part and the filter upper part are connected through bolt.

[0011] As the preferred of the utility model, the bottom of the filter lower cone is equipped with a material lowering tank, the first pneumatic butterfly valve is arranged at the connecting position of the filter lower cone and the material lowering tank, and the second pneumatic butterfly valve is arranged at the discharge port of the material lowering tank.

[0012] The lower cone of the filter is provided with a temperature sensor and a nitrogen protection device, the temperature sensor is used for sending a monitored temperature signal to a controller, and when the temperature in the filter is greater than a set value, the controller controls an alarm to give an alarm and controls a valve on the nitrogen protection device to be opened, so that nitrogen is supplemented into the lower cone of the filter through the nitrogen protection device to reduce the temperature.

[0013] The upper part of the filter is provided with an exhaust pipe, and the exhaust pipe is connected with the compressor.

[0014] The lower back flushing chamber is divided into a plurality of independent and closed sub-chambers by a plurality of vertical partitions, the flow guide pipe is arranged close to the center of the sub-chamber, the nozzle and the flow guide pipe are arranged opposite in the vertical direction, the inner diameter of the upper end of the flow guide pipe is greater than the caliber of the gas outlet end of the nozzle, and the back flushing gas blown out by the nozzle is instantaneously blown into the flow guide pipe.

[0015] The middle part of the filter is provided with a plurality of filter pipes, the plurality of filter pipes are evenly divided into a plurality of groups, and each group of filter pipes is sequentially arranged in a manner matched with the shape of the sub-chamber so that the upper end of each group of filter pipes is communicated with the sub-chamber.

[0016] The filter pipe is fixedly installed in the middle part of the filter through the fixing plate and the fixing seat.

[0017] The filter pipe is fixedly installed in the middle part of the filter through the fixing plate and the fixing seat.

[0018] (1) The upper back flushing chamber and the lower back flushing chamber are arranged on the upper part of the filter, the lower back flushing chamber is composed of a plurality of independent sub-chambers, the bottom of the upper back flushing chamber is provided with a flow guide pipe corresponding to each sub-chamber, the flow guide pipe is of a variable diameter structure, the flow guide pipe can increase the gas pressure of the gas blown into the filter pipe after special design, the introduction force of the back flushing gas is larger, the dust on the filter pipe can be cleaned in time, and the filtering effect is improved; the back flushing structure type of the novel filter is obviously superior to that of a conventional filter, and is more suitable for the needs of the present production process.

[0019] (2) The temperature sensor and the nitrogen protection device are arranged on the lower cone of the filter, when the temperature inside the filter is too high, fresh nitrogen can be automatically supplemented into the filter to reduce the temperature, and the risk of burning during the filtering process is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings. In the drawings:

[0021] Figure 1 It is a plane view of the filter of the present application;

[0022] Figure 2 It is an axonometric view of the filter of the present application;

[0023] Figure 3 It is a plan view of the filter of the present application Figure 1 ;

[0024] Figure 4 It is a plan view of the filter of the present application Figure 2 ;

[0025] Figure 5 It is a view of the upper part of the filter of the present application Figure 1 ;

[0026] Figure 6 It is a view of the upper part of the filter of the present application Figure 2 ( Figure 4 Sectional view along B-B);

[0027] Figure 7 It is an enlarged view of A of the present application Figure 1 ;

[0028] Figure 8 It is an enlarged view of B of the present application Figure 6 ;

[0029] Figure 9 It is an enlarged view of C of the present application Figure 6 ;

[0030] Reference signs: upper part of filter 1, middle part of filter 2, lower cone of filter 3, annular backflush air inlet pipe 4, backflush shunt assembly 5, transverse partition plate 6, vertical partition plate 7, flow guide pipe 8, filter pipe 9, mounting bracket 10, short pipe clamp 11, clamp 12, clamp gasket 13, fixing plate 14, material lowering tank 15, first pneumatic butterfly valve 16, temperature sensor 17, nitrogen protection device 18, exhaust pipe 101, air inlet interface 201, shunt pipe 501, corrugated pipe 502, L-shaped turning pipe 503, nozzle 504, first variable diameter portion 801, constant diameter portion 802, second variable diameter portion 803. DETAILED DESCRIPTION

[0031] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the 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 the other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of the present application.

[0032] In the description of the present application, it should be further explained that, unless otherwise explicitly specified and limited, the terms "arrangement", "connection" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0033] As shown in the Figures 1 to 9 The filter for the airflow mill equipment in the rare earth permanent magnet industry provided by the embodiment comprises a filter upper part 1, a filter middle part 2, and a filter lower cone 3. The filter upper part 1 is provided with an annular back-blowing air inlet pipe 4 at a position close to the top end. A plurality of back-blowing shunt components 5 are arranged at intervals on the annular back-blowing air inlet pipe 4. The back-blowing shunt components 5 are provided with back-blowing valves. The air outlet ends of the back-blowing shunt components 5 penetrate through the top cover of the filter upper part 1 and extend into the filter upper part 1. The inside of the filter upper part 1 is divided into an upper back-blowing chamber a and a lower back-blowing chamber b by a transverse partition plate 6. Each of the back-blowing shunt components 5 is in communication with the upper back-blowing chamber a. The lower back-blowing chamber b is divided into a plurality of independent and closed sub-chambers c by a plurality of vertical partition plates 7. The transverse partition plate 6 is provided with a flow guide pipe 8 at a position opposite to the sub-chambers c. The flow guide pipe 8 forms independent communication channels between each of the sub-chambers c and the upper back-blowing chamber a. The inner diameter of the flow guide pipe 8 is a variable-diameter structure. The upper end is a first variable-diameter part 801 with an inner diameter gradually decreasing from top to bottom. The middle part is a constant-diameter part 802 with an unchanged inner diameter. The lower end is a second variable-diameter part 803 with an inner diameter gradually increasing from top to bottom. The filter middle part 2 is provided with a filter pipe 9 at a position opposite to the sub-chambers c. The back-blowing gas directly blows to the filter pipe 9 after being pressurized and speeded up by the flow guide pipe 8.

[0034] In the embodiment, the filter upper part 1 is provided with an exhaust pipe 101 connected with a compressor (not shown) for discharging the filtered gas into the compressor.

[0035] Further, continuing as Figures 1 to 9As shown, in the embodiment, the outer wall of the filter upper part 1 is provided with a plurality of mounting brackets 10 at a position close to the top end, and the annular backflush air inlet pipe 4 is fixed on the mounting bracket 10 through a short pipe clamp 11 and a nut; the annular backflush air inlet pipe 4 is connected with a backflush main pipe (not marked), and backflush gas is introduced through the backflush main pipe; eight backflush shunt assemblies 2 are arranged at equal intervals on the annular backflush air inlet pipe 4; the backflush shunt assembly 2 comprises a shunt pipe 501, a corrugated pipe 502, an L-shaped diversion pipe 503, and a nozzle 504; one end of the shunt pipe 501 is connected with the annular backflush air inlet pipe 4, and the other end is connected with the corrugated pipe 502 through a clamp 12 and a clamp washer 13; the other end of the corrugated pipe 502 is connected with the L-shaped diversion pipe 503 through the clamp 12 and the clamp washer 13; the other end of the L-shaped diversion pipe 503 is connected with the nozzle 504 through the clamp 12 and the clamp washer 13, and the L-shaped diversion pipe 503 is provided with a backflush valve (not marked); the nozzle 504 is fixed at the top end of the filter upper part 1, and extends into the filter upper part 1 through the top cover of the filter upper part 1.

[0036] In the embodiment, the lower backflush chamber b is divided into eight independent and closed sub-chambers c by eight vertical partitions 7; the flow guide pipe 8 is arranged close to the center of the sub-chamber c; the nozzle 504 is arranged opposite to the flow guide pipe 8 in the vertical direction; the inner diameter of the upper end of the flow guide pipe 8 is greater than the caliber of the gas outlet end of the nozzle 504, so that the backflush gas blown out by the nozzle 504 is instantaneously blown into the flow guide pipe 8;

[0037] A plurality of filter pipes 9 are arranged in the filter middle part 2; the plurality of filter pipes are evenly divided into groups; each group of filter pipes is arranged in sequence in a manner matched with the shape of the sub-chamber c, so that the upper end of each group of filter pipes is in communication with the sub-chamber c.

[0038] It should be noted that, in the embodiment, the specific partitioning (the number of sub-chambers) of the lower backflush chamber b is determined according to the size of the filter; the number of partitions is determined according to the size of the filter, and is not limited to the eight sub-chambers described above, which are only used for illustration; and the specific number of filter pipes 9 is also determined according to the size of the filter; when the filter is relatively large, more filter pipes can be arranged, for example, several hundred, to meet the filtering requirements.

[0039] In the embodiment, the filter pipe 9 is fixedly installed in the interior of the filter middle part 2 through a fixing plate 14 and a fixing seat (not marked); the sidewall of the filter middle part 2 is provided with an air inlet interface 201, through which dust-containing gas is introduced into the interior of the filter; the filter middle part 2 and the filter lower cone 3 are of an integrated structure; and the filter middle part 2 and the filter upper part 1 are connected through bolts;

[0040] The bottom of the filter lower cone 3 is provided with a material dropping tank 15, and a first pneumatic butterfly valve 16 is arranged at the connection between the filter lower cone 3 and the material dropping tank 15.

[0041] Further, as shown in the embodiment, the filter lower cone 3 is further provided with a temperature sensor 17 and a nitrogen protection device 18. Figure 1 The temperature sensor 17 is used to send a monitored temperature signal to a controller (PLC), and when the controller monitors that the temperature in the filter is too high (greater than a set value), the controller controls an alarm to alarm, and simultaneously controls a valve on the nitrogen protection device to be opened, so that fresh nitrogen is supplemented into the filter lower cone 3 through the nitrogen protection device 18 to cool down.

[0042] It should be noted that in the embodiment, the valve on the nitrogen protection device 18 can be manually operated to be opened, or the valve can be automatically opened through the controller, and the valve is preferably automatically controlled.

[0043] When the filter provided by the utility model is used to filter the dust-containing gas, a plurality of backflushing shunt components 5 can be opened in sequence in the filtering process, that is, the backflushing shunt components 5 are opened in sequence in the clockwise or counterclockwise direction, when one of the backflushing shunt components 5 is opened, the backflushing gas is blown into the flow guide pipe 8 through the nozzle 504, and the backflushing gas is blown to the filter pipe 9 after being pressurized by the flow guide pipe 8, so as to flush the dust on the filter pipe 9, thereby ensuring the filtering effect of the filter pipe 9, at this time, other filter pipes can normally filter, and the filtered gas is discharged from the exhaust pipe 101 after passing through each sub-chamber c and the upper backflushing chamber a; when the equipment is running, the temperature sensor 17 detects the internal temperature in real time, and when the temperature is too high, the valve on the nitrogen protection device 18 is opened, so that fresh nitrogen is supplemented into the filter lower cone 3 to cool down.

[0044] The above is the specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

Claims

1. A filter for rare earth permanent magnet industry airflow mill equipment, comprising a filter upper part, a filter middle part, and a filter lower cone; characterized in that, The upper part of the filter is provided with an annular back-blowing air inlet pipe near the top end, a plurality of back-blowing shunt components are arranged at intervals on the annular back-blowing air inlet pipe, a back-blowing valve is arranged on the back-blowing shunt component, and the air outlet end of the back-blowing shunt component penetrates the top cover of the upper part of the filter and extends into the upper part of the filter; the inside of the upper part of the filter is divided into an upper back-blowing chamber and a lower back-blowing chamber by a transverse partition plate, each back-blowing shunt component is in communication with the upper back-blowing chamber; the lower back-blowing chamber is divided into a plurality of independent and closed sub-chambers by a plurality of vertical partition plates; the transverse partition plate is provided with a flow guide pipe at a position opposite to the sub-chamber, each sub-chamber and the upper back-blowing chamber form an independent communication channel through the flow guide pipe, the inner diameter of the flow guide pipe is a variable diameter structure, the upper end is a first variable diameter part with a gradually decreasing inner diameter from top to bottom, the middle is a constant diameter part with a constant inner diameter, and the lower end is a second variable diameter part with a gradually increasing inner diameter from top to bottom; the middle part of the filter is provided with a filter pipe at a position opposite to the sub-chamber, and the back-blowing gas directly blows to the filter pipe after being pressurized and accelerated by the flow guide pipe.

2. A filter for use in a jet mill apparatus in the rare earth permanent magnet industry according to claim 1, characterized in that, The outer side wall of the upper part of the filter is provided with a plurality of mounting brackets at intervals near the top end, and the annular back-blowing air inlet pipe is fixed on the mounting bracket through a short pipe clamp and a nut.

3. A filter for use in a jet mill apparatus in the rare earth permanent magnet industry according to claim 1, characterized in that, The annular back-blowing air inlet pipe is connected with a back-blowing main pipe, a plurality of back-blowing shunt components are arranged at equal intervals on the annular back-blowing air inlet pipe, the back-blowing shunt component comprises a shunt pipe, a corrugated pipe, an L-shaped turning pipe and a nozzle; wherein one end of the shunt pipe is connected with the annular back-blowing air inlet pipe, the other end is connected with the corrugated pipe through a clamp and a clamp gasket; the other end of the corrugated pipe is connected with the L-shaped turning pipe through a clamp and a clamp gasket; the other end of the L-shaped turning pipe is connected with the nozzle through a clamp and a clamp gasket, and the L-shaped turning pipe is provided with a back-blowing valve; the nozzle is fixed on the top end of the upper part of the filter, and penetrates the top cover of the upper part of the filter and extends into the upper part of the filter.

4. The filter for a jet mill device in the rare earth permanent magnetic industry according to claim 1, characterized in that, An air inlet interface is arranged on the side wall of the middle part of the filter, dust-containing gas is introduced into the inside of the filter through the air inlet interface, the middle part of the filter and the lower cone of the filter are in an integrated structure, and the middle part of the filter is connected with the upper part of the filter through a bolt.

5. A filter for use in a jet mill apparatus in the rare earth permanent magnet industry according to claim 1, characterized in that, A material dropping tank is arranged at the bottom of the lower cone of the filter, a first pneumatic butterfly valve is arranged at the connection position of the lower cone of the filter and the material dropping tank, and a second pneumatic butterfly valve is arranged at the discharge port of the material dropping tank.

6. A filter for use in a jet mill apparatus in the rare earth permanent magnet industry according to claim 1, characterized in that, A temperature sensor and a nitrogen protection device are arranged on the lower cone of the filter, the temperature sensor is used to send a monitored temperature signal to a controller, when the controller monitors that the temperature in the filter is greater than a set value, the controller controls an alarm to alarm, and simultaneously controls a valve on the nitrogen protection device to open, and nitrogen is supplemented into the lower cone of the filter through the nitrogen protection device to cool.

7. A filter for use in a jet mill apparatus in the rare earth permanent magnet industry according to claim 1, characterized in that, The upper part of the filter is provided with an exhaust pipe, and the exhaust pipe is connected with a compressor.

8. A filter for use in a jet mill apparatus in the rare earth permanent magnet industry according to claim 3, characterized in that, The lower back-blowing chamber is divided into a plurality of independent and closed sub-chambers by a plurality of vertical partition plates, the flow guide pipe is arranged near the center of the sub-chamber, the nozzle and the flow guide pipe are arranged opposite to each other in the vertical direction, the inner diameter of the upper end of the flow guide pipe is greater than the diameter of the air outlet end of the nozzle, and the back-blowing gas blown out by the nozzle is blown into the flow guide pipe instantaneously.

9. A filter for use in a jet mill apparatus in the rare earth permanent magnet industry according to claim 3, characterized in that, A plurality of filter pipes are arranged in the middle part of the filter, and the plurality of filter pipes are evenly divided into groups, and each group of filter pipes is arranged in sequence in a manner matching the shape of the sub-chamber, and the upper end of each group of filter pipes is communicated with the sub-chamber.

10. A filter for use in a jet mill apparatus in the rare earth permanent magnet industry according to claim 9, characterized in that, The filter pipes are fixedly installed in the inside of the middle part of the filter through the fixing plate and the fixing seat.

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