Spray drying equipment for hard alloy material processing

Abstract

The invention discloses spray drying equipment for hard alloy material processing, comprising: a drying tank, the upper part of which is provided with a rotary nozzle, and the feed end of the rotary nozzle is connected to an external material source through a pump; a circle of fixed convex edge is arranged on the lower portion of the drying tank, the heater comprises an annular electrothermal film glass plate installed on the lower side of the fixed convex edge in a sealed mode, and the annular electrothermal film glass plate is arranged in a circular truncated cone shape with the upper portion narrower than the lower portion; the hot air mechanism comprises an air inlet pipe connected to the portion, on the inner side of the annular electrothermal film glass plate, of the drying tank, the drying tank is outwards connected with a hot air guide pipe, the air outlet end of the hot air guide pipe extends into the drying tank and is rotationally provided with an air guide barrel, and a plurality of corresponding air holes are formed in the edge of the bottom side of the air guide barrel. The hard alloy material drying device can effectively and obviously improve the drying effect and drying efficiency of hard alloy materials.

Description

Technical Field

[0001] The invention relates to the technical field of cemented carbide material processing equipment, in particular to a spray drying equipment for cemented carbide material processing. Background Art

[0002] Cemented carbide is an alloy material made from a hard compound of a refractory metal and a binder metal through a powder metallurgy process. During its processing, the cemented carbide slurry needs to be dried. Currently, the equipment used for drying cemented carbide slurry is mainly spray drying equipment.

[0003] Existing spray drying equipment for processing cemented carbide materials generally adopts conventional spray dryers available on the market, which mainly include a drying tank and a rotating nozzle installed on the top of the drying tank. The feed end pump of the rotating nozzle is connected to an external material source. The high-speed rotation of the rotating nozzle is used to evenly spray the cemented carbide slurry, and then the hot air is transmitted into the drying tank through the corresponding hot air mechanism. After the evenly diffused material is fully contacted with the hot air, the moisture is quickly evaporated, thereby obtaining a dry cemented carbide powder material. Existing spray drying equipment for processing cemented carbide materials has the following defects during actual use: 1) The contact between the material and the hot air is not uniform enough, resulting in the drying effect of some materials often failing to meet the design requirements; 2) The utilization rate of the heat source is insufficient, resulting in relatively low material drying efficiency.

[0004] Therefore, the research purpose of this invention is to design a spray drying equipment for cemented carbide material processing that can effectively improve the contact uniformity between the material and the hot air, and effectively improve the utilization rate of the heat source, thereby effectively and significantly improving the drying effect and drying efficiency of the cemented carbide material. Summary of the Invention

[0005] In view of the technical problems existing in the above-mentioned prior art, the present invention provides a spray drying device for processing cemented carbide materials, which can effectively solve the technical problems existing in the above-mentioned prior art.

[0006] The technical solution of the present invention is: A spray drying device for processing cemented carbide materials, comprising: The drying tank is provided with a rotating nozzle on the top, and the feed end pump of the rotating nozzle is connected to the external material source; A heater, wherein a corresponding fixed ridge is provided in the middle of the inner side wall of the drying tank, and the heater comprises an annular electric heating film glass plate sealed and mounted on the lower side of the fixed ridge, wherein the annular electric heating film glass plate is arranged in a frustum shape that is narrow at the top and wide at the bottom, and the bottom end of the annular electric heating film glass plate is sealed and connected to the inner side wall of the drying tank; Hot air mechanism, including an air inlet pipe connected to a drying tank on the inner side of the annular electrothermal film glass plate, the air inlet pipe is connected to an external blower, and on one side of the drying tank without the air inlet pipe, a corresponding hot air duct is connected outward. The air outlet end of the hot air duct extends into the drying tank, and a guide air cylinder spaced from the annular electrothermal film glass plate is rotatably installed. The upper part of the guide air cylinder is closed, and a plurality of corresponding air permeable holes are evenly arranged at the bottom side edge of the guide air cylinder.

[0007] The guide air cylinder is rotatably installed on the hot air duct through a sealed bearing. The air outlet end of the hot air duct is horizontally folded outward obliquely and is arranged in a constricted shape. A serrated convex edge corresponding to the air outlet end of the hot air duct is arranged on the inner side wall of the guide air cylinder.

[0008] A rotation speed detection sensor for detecting the rotation speed of the guide air cylinder is installed on the hot air duct. The hot air duct is hermetically connected to the drying tank through a corresponding rubber isolation pad, and a corresponding ultrasonic transducer is fixedly installed on the hot air duct at the bottom side of the drying tank. The ultrasonic transducer is connected to an external ultrasonic generating device.

[0009] When the rotation speed detection sensor detects that the speed of the guide air cylinder is less than the set value v1, it is judged that the amount of adhered material on the guide air cylinder exceeds the standard. At this time, the ultrasonic generating device can be controlled to start. The ultrasonic transducer transmits ultrasonic vibration to the hot air duct, and the ultrasonic vibration is transmitted to the guide air cylinder through the hot air duct, so that the material adhered to the guide air cylinder falls off in time.

[0010] A heat reflection film material layer is coated on the outer side wall of the guide air cylinder.

[0011] The annular electrothermal film glass plate includes a frustum-shaped glass substrate. A semiconductor electrothermal film is sprayed on one end face of the frustum-shaped glass substrate facing the inner side wall of the drying tank. Electrodes are respectively fixedly connected to the upper and lower ends of the semiconductor electrothermal film, and the electrodes are connected to an external power supply through a corresponding electric controller.

[0012] A filter is arranged on the air inlet pipe. The filter includes a filter screen, and a dust removal filter cotton and an air desiccant material installed in the filter screen.

[0013] A discharge pipe with a discharge valve is fixedly connected to the drying tank, and an exhaust pipe with an exhaust valve is connected outward on the upper side of the drying tank.

[0014] The external material source is stored in a corresponding mixing tank. A mixing shaft driven by a corresponding drive motor is rotatably installed in the mixing tank, and corresponding mixing plates are fixedly connected to the mixing shaft.

[0015] Corresponding openings are respectively arranged on the inner sides of the stirring plates. Corresponding support plates are swingably installed at the openings. The inner ends of the support plates are respectively movably inserted onto the stirring shaft through elastic members. The outer ends of the support plates are respectively docked with the stirring plates through corresponding inclined planes. The driving motor is a forward and reverse rotation motor. When the driving motor starts to rotate forward, the outer ends of the support plates abut against the stirring plates. When the driving motor starts to rotate in reverse, the outer ends of the support plates leave the stirring plates and are arranged at an interval from the stirring plates in an inclined state.

[0016] Advantages of the present invention: 1) The heater of the present invention includes an annular electrothermal film glass plate hermetically installed under the fixed convex edge. The annular electrothermal film glass plate is arranged in a frustum shape with a narrow upper part and a wide lower part, and the bottom end of the annular electrothermal film glass plate is hermetically connected to the inner side wall of the drying tank. The hot air mechanism includes an air inlet pipe connected to the drying tank inside the annular electrothermal film glass plate. The air inlet pipe is connected to an external blower. One side of the drying tank without the air inlet pipe is externally connected with a hot air duct. The air outlet end of the hot air duct extends into the drying tank and rotatably installs a guide air cylinder arranged at an interval from the annular electrothermal film glass plate. The upper part of the guide air cylinder is hermetically arranged, and a plurality of corresponding air permeable holes are uniformly arranged at the bottom side edge of the guide air cylinder.

[0017] During the drying process, the materials are effectively and evenly distributed into the drying tank through the rotary nozzle. External air flows through the space between the annular electrothermal film glass plate and the drying tank to be heated and then is evenly output outward along the bottom side of the guide air cylinder. As the hot air rises upward, it effectively contacts the materials in the fixed drying tank, thereby effectively drying the materials. Most importantly, when the materials settle through the space between the annular electrothermal film glass plate and the guide air cylinder, they can more fully and evenly contact the just-output hot air, thereby greatly improving the contact uniformity between the materials and the hot air. Moreover, the heat and far-infrared waves emitted by the annular electrothermal film glass plate itself can directly act on the heating of the materials flowing through the space between the annular electrothermal film glass plate and the guide air cylinder, thereby further effectively improving the contact uniformity between the materials and the hot air and effectively improving the utilization rate of the heat source, and further effectively and significantly improving the drying effect and drying efficiency of the cemented carbide materials.

[0018] 2) The guide air cylinder of the present invention is rotatably installed on the hot air duct through a sealed bearing. The air outlet end of the hot air duct is horizontally and outwardly inclined and folded and arranged in a necked shape. The inner side wall of the guide air cylinder is provided with a serrated convex edge corresponding to the air outlet end of the hot air duct. In this way, during the transmission of the hot air, the guide air cylinder can be effectively driven to rotate by the scouring force, so that the guide air cylinder outputs hot air in a rotating state, which can not only effectively improve the uniformity of the hot air output, but also effectively reduce the probability of materials adhering to the guide air cylinder, thereby effectively improving the practical effect of the present invention.

[0019] 3) A rotational speed detection sensor for detecting the rotational speed of the air guide cylinder is installed on the hot air duct of the present invention. The hot air duct is hermetically connected to the drying tank through a corresponding rubber isolation pad, and a corresponding ultrasonic transducer is fixedly installed on the hot air duct at the bottom side of the drying tank. When the rotational speed detection sensor detects that the speed of the air guide cylinder is less than the set value v1, it is determined that the amount of adhered material on the air guide cylinder exceeds the standard. At this time, the ultrasonic generating device can be controlled to start. The ultrasonic transducer transmits ultrasonic vibration to the hot air duct, and the ultrasonic vibration is transmitted to the air guide cylinder through the hot air duct, so that the material adhered to the air guide cylinder drops in time. In this way, on the premise of maintaining the normal operation of the present invention, the problem of material adhesion to the air guide cylinder can be effectively further overcome, thereby further effectively improving the practical effect of the present invention.

[0020] 4) A heat reflection film material layer is coated on the outer side wall of the air guide cylinder of the present invention to reflect the heat and far-infrared waves emitted by the annular electrothermal film glass plate back to the space between the air guide cylinder and the annular electrothermal film glass plate, so as to further effectively improve the utilization rate of the heat source of the present invention.

[0021] 5) Corresponding openings are respectively arranged on the inner sides of the stirring plates for dispersing the material source of the present invention, and corresponding support plates are swingably installed at the openings. The inner ends of the support plates are respectively movably embedded on the stirring shaft through elastic members, and the outer ends of the support plates are respectively butt-jointed with the stirring plates through corresponding inclined planes. The driving motor for driving the stirring plates is a forward and reverse rotation motor. When the material source is just put in place, the driving motor is first started to rotate forward, so that the outer end of the support plate abuts against the stirring plate, thereby expanding the stirring area to improve the dispersing effect on the material (slurry); when the material is fully dispersed, the driving motor is started to rotate in reverse, so that the outer end of the support plate leaves the stirring plate and is arranged at an interval with the stirring plate in an inclined state, so as to reduce the stirring surface, thereby reducing the force on the entire stirring mechanism. In this way, the material can be quickly dispersed, and the uniformity of the material can be effectively maintained for a long time, and the force on the entire stirring mechanism can be reduced to ensure the service life of the stirring mechanism. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of the present invention.

[0023] Figure 2 is a schematic structural diagram of the annular electrothermal film glass plate.

[0024] Figure 3 is a schematic structural diagram of the filter.

[0025] Figure 4 is an assembly schematic diagram of the support plate, the stirring plate and the stirring shaft.

[0026] Figure 5 It is a usage state diagram when the support plate and the stirring plate are arranged at intervals.

[0027] In the attached drawings: drying tank 1, rotary spray head 101, fixed flange 102, heater 2, annular electrothermal film glass plate 201, frustum-shaped glass substrate 2011, semiconductor electrothermal film 2012, electrode 2013, heat reflection film material layer 202, hot air mechanism 3, air inlet pipe 301, hot air duct 302, air guide cylinder 303, air vent holes 3031, sealed bearing 4, serrated flange 5, rotational speed detection sensor 6, rubber isolation pad 7, ultrasonic transducer 8, filter 9, filter screen 901, dust removal filter cotton 902, air desiccant material 903, discharge pipe 10, discharge valve 1001, exhaust valve 11, exhaust pipe 12, stirring tank 13, drive motor 14, stirring shaft 15, stirring plate 16, support plate 17, elastic member 18. Specific embodiments

[0028] For the convenience of those skilled in the art to understand, the embodiments will now be combined with the attached drawings to further describe the structure of the present invention in detail: Reference Figures 1-5 , a spray drying device for processing cemented carbide materials, comprising: Drying tank 1, with a rotary spray head 101 arranged on the upper part, and the feeding end of the rotary spray head 101 is pumped to an external material source; Heater 2, a corresponding fixed flange 102 is arranged in a circle in the middle of the inner side wall of the drying tank 1, and the heater 2 includes an annular electrothermal film glass plate 201 enclosed and installed under the fixed flange 102. The annular electrothermal film glass plate 201 is arranged in a frustum shape with a narrow upper part and a wide lower part, and the bottom end of the annular electrothermal film glass plate 201 is hermetically connected to the inner side wall of the drying tank 1; Hot air mechanism 3, including an air inlet pipe 301 connected to the drying tank 1 inside the annular electrothermal film glass plate 201. The air inlet pipe 301 is connected to an external blower. On one side of the drying tank 1 where the air inlet pipe 301 is not provided, a corresponding hot air duct 302 is connected outward. The air outlet end of the hot air duct 302 extends into the drying tank 1, and an air guide cylinder 303 arranged at an interval from the annular electrothermal film glass plate 201 is rotatably installed. The upper part of the air guide cylinder 303 is hermetically arranged, and a plurality of corresponding air vent holes 3031 are evenly arranged at the bottom side edge of the air guide cylinder 303.

[0029] During the drying process, the material is effectively and evenly distributed into the drying tank 1 through the rotary nozzle 101. The external air flows through the space between the annular electric heating film glass plate 201 and the drying tank 1 for heating, and then is evenly output outward along the bottom side of the air guiding cylinder 303. As the hot air rises upward, it effectively contacts the material in the fixed drying tank 1, thereby effectively drying the material. Most importantly, when the material settles through the space between the annular electric heating film glass plate 201 and the air guiding cylinder 303, it can make more sufficient and uniform contact with the just-output hot air, thereby greatly improving the contact uniformity between the material and the hot air. Moreover, the heat and far-infrared waves emitted by the annular electric heating film glass plate 201 itself can directly act on the heating of the material flowing through the space between the annular electric heating film glass plate 201 and the air guiding cylinder 303, further effectively improving the contact uniformity between the material and the hot air and effectively improving the utilization rate of the heat source, and thus effectively and significantly improving the drying effect and drying efficiency of the cemented carbide material.

[0030] The air guiding cylinder 303 is rotatably installed on the hot air duct 302 through a sealed bearing 4. The air outlet end of the hot air duct 302 is horizontally tilted and folded outward and is arranged in a reduced opening shape. A serrated convex edge 5 corresponding to the air outlet end of the hot air duct 302 is provided on the inner side wall of the air guiding cylinder 303. In this way, during the transmission of the hot air, the air guiding cylinder 303 can be effectively driven to rotate by the scouring force, so that the hot air is output in a rotating state, which can not only effectively improve the uniformity of the hot air output, but also effectively reduce the probability of the material adhering to the air guiding cylinder 303, thereby effectively improving the practical effect of the present invention.

[0031] A rotation speed detection sensor 6 for detecting the rotation speed of the air guiding cylinder 303 is installed on the hot air duct 302. The hot air duct 302 is hermetically connected to the drying tank 1 through a corresponding rubber isolation pad 7. And a corresponding ultrasonic transducer ⑧ is fixedly installed on the hot air duct 302 at the bottom side of the drying tank 1. The ultrasonic transducer 8 is connected to an external ultrasonic generating device.

[0032] When the rotation speed detection sensor 6 detects that the speed of the air guiding cylinder 303 is less than the set value v1, it is judged that the amount of the material adhering to the air guiding cylinder 303 exceeds the standard. At this time, the ultrasonic generating device can be controlled to start. The ultrasonic transducer 8 transmits ultrasonic vibration to the hot air duct 302, and the ultrasonic vibration is transmitted to the air guiding cylinder 303 through the hot air duct 302, so that the material adhering to the air guiding cylinder 303 falls off in time. In this way, on the premise of maintaining the normal operation of the present invention, the problem of the material adhering to the air guiding cylinder 303 can be effectively overcome, thereby further effectively improving the practical effect of the present invention.

[0033] The outer sidewall of the air guide tube 303 is coated with a heat-reflective film material layer 202 to reflect the heat and far-infrared waves emitted by the annular electrothermal film glass plate 201 back to the space between the air guide tube 303 and the annular electrothermal film glass plate 201, thereby further effectively improving the utilization rate of the heat source of the present invention.

[0034] The annular electrothermal film glass plate 201 includes a frustum-shaped glass substrate 2011. A semiconductor electrothermal film 2012 is sprayed on one end face of the frustum-shaped glass substrate 2011 facing the inner sidewall of the drying tank 1. Electrodes 2013 are respectively fixedly connected to the upper and lower ends of the semiconductor electrothermal film 2012, and the electrodes 2013 are connected to an external power source through corresponding electrical controllers.

[0035] A filter 9 is provided on the air inlet pipe 301. The filter 9 includes a filter mesh 901, a dust removal filter cotton 902 and an air desiccant material 903 disposed in the filter mesh 901.

[0036] A discharge pipe 10 with a discharge valve 1001 is fixedly connected to the drying tank 1. An exhaust pipe 12 with an exhaust valve 11 is connected outwardly from the upper side of the drying tank 1.

[0037] The external material source is stored in a corresponding mixing tank 13. A mixing shaft 15 driven by a corresponding drive motor 14 is rotatably installed in the mixing tank 13. Stirring plates 16 are fixedly connected to the mixing shaft 15.

[0038] Openings are respectively provided on the inner sides of the stirring plates 16. Corresponding support plates 17 are swingably installed at the openings. The inner ends of the support plates 17 are respectively movably inserted onto the mixing shaft 15 through elastic members 18. The outer ends of the support plates 17 and the stirring plates 16 are respectively butt-jointed through corresponding inclined surfaces. The drive motor 14 is a forward and reverse rotation motor. When the drive motor 14 starts to rotate forward, the outer ends of the support plates 17 abut against the stirring plates 16. When the drive motor 14 starts to rotate in reverse, the outer ends of the support plates 17 leave the stirring plates 16 and are inclined and spaced from the stirring plates 16.

[0039] When the material source is just fed into the stirring tank 13, the present invention first drives the motor 14 to start rotating forward, so that the outer end of the support plate 17 abuts against the stirring plate 16, thereby expanding the stirring area to improve the dispersion effect on the material (slurry); when the material is fully dispersed, the motor 14 is driven to start rotating in reverse, so that the outer end of the support plate 17 leaves the stirring plate 16 and is arranged at an inclination and spaced from the stirring plate 16 to reduce the stirring surface, thereby reducing the force on the entire stirring mechanism. In this way, the material can be quickly dispersed, and the uniformity of the material can be effectively maintained for a long time, and the force on the entire stirring mechanism can be reduced to ensure the service life of the stirring mechanism.

[0040] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A spray drying device for processing cemented carbide materials, characterized in that, Comprising: A drying tank (1), with a rotary spray head (101) provided at the upper part, and the feed end of the rotary spray head (101) is pumped to an external material source; A heater (2), a corresponding fixed flange (102) is provided in a circle in the middle of the inner side wall of the drying tank (1), the heater (2) includes an annular electrothermal film glass plate (201) hermetically installed under the fixed flange (102), the annular electrothermal film glass plate (201) is arranged in a frustum shape with a narrow upper part and a wide lower part, and the bottom end of the annular electrothermal film glass plate (201) is hermetically connected to the inner side wall of the drying tank (1); A hot air mechanism (3), including an air inlet pipe (301) connected to the drying tank (1) inside the annular electrothermal film glass plate (201), the air inlet pipe (301) is connected to an external blower, on one side of the drying tank (1) where the air inlet pipe (301) is not provided, a corresponding hot air duct (302) is connected outward, the air outlet end of the hot air duct (302) extends into the drying tank (1), and a guide air cylinder (303) spaced from the annular electrothermal film glass plate (201) is rotatably installed, the upper part of the guide air cylinder (303) is hermetically arranged, and a plurality of corresponding air permeable holes (3031) are evenly arranged at the bottom side edge of the guide air cylinder (303).

2. The spray drying equipment for processing cemented carbide materials according to claim 1, characterized in that, The guide air cylinder (303) is rotatably installed on the hot air duct (302) through a sealed bearing (4), the air outlet end of the hot air duct (302) is horizontally tilted outward and turned over and is arranged in a necked shape, and a serrated flange (5) corresponding to the air outlet end of the hot air duct (302) is arranged on the inner side wall of the guide air cylinder (303).

3. The spray drying equipment for processing cemented carbide materials according to claim 2, characterized in that, A rotation speed detection sensor (6) for detecting the rotation speed of the guide air cylinder (303) is installed on the hot air duct (302), the hot air duct (302) is hermetically connected to the drying tank (1) through a corresponding rubber isolation pad (7), and a corresponding ultrasonic transducer (8) is fixedly installed on the hot air duct (302) at the bottom side of the drying tank (1), and the ultrasonic transducer (8) is connected to an external ultrasonic generating device.

4. A spray drying device for processing cemented carbide materials according to claim 3, characterized in that, When the rotation speed detection sensor (6) detects that the speed of the guide air cylinder (303) is less than the set value v1, it is judged that the amount of adhered material on the guide air cylinder (303) exceeds the standard. At this time, the ultrasonic generating device can be controlled to start, the ultrasonic transducer (8) transmits ultrasonic vibration to the hot air duct (302), and the ultrasonic vibration is transmitted to the guide air cylinder (303) through the hot air duct (302), so that the material adhered to the guide air cylinder (303) falls off in time.

5. A spray drying device for processing cemented carbide materials according to claim 1, wherein, A heat reflection film material layer (202) is coated on the outer side wall of the guide air cylinder (303).

6. A spray drying device for processing cemented carbide materials according to claim 1, characterized in that, The annular electrothermal film glass plate (201) includes a frustum-shaped glass substrate (2011). A semiconductor electrothermal film (2012) is sprayed on one end face of the frustum-shaped glass substrate (2011) facing the inner wall of the drying tank (1). Electrodes (2013) are fixedly connected to the upper and lower ends of the semiconductor electrothermal film (2012) respectively, and the electrodes (2013) are connected to an external power supply through corresponding electric controllers.

7. A spray drying device for processing cemented carbide materials according to claim 1, characterized in that, A filter (9) is provided on the air inlet pipe (301). The filter (9) includes a filter mesh (901), a dust removal filter cotton (902) and an air desiccant material (903) disposed in the filter mesh (901).

8. The spray drying equipment for processing cemented carbide materials according to claim 1, wherein, A discharge pipe (10) equipped with a discharge valve (1001) is fixedly connected to the drying tank (1). An exhaust pipe (12) equipped with an exhaust valve (11) is connected outward from the upper side of the drying tank (1).

9. The spray drying equipment for processing cemented carbide materials according to claim 1, characterized in that, The external material source is stored in a corresponding stirring tank (13). A stirring shaft (15) driven by a corresponding driving motor (14) is rotatably installed in the stirring tank (13), and corresponding stirring plates (16) are fixedly connected to the stirring shaft (15).

10. The spray drying equipment for processing cemented carbide materials according to claim 9, characterized in that, Corresponding openings are respectively provided on the inner sides of the stirring plates (16). Corresponding support plates (17) are swingably installed at the openings. The inner ends of the support plates (17) are movably inserted onto the stirring shaft (15) through elastic members (18) respectively, and the outer ends of the support plates (17) are respectively butt-jointed with the stirring plates (16) through corresponding inclined surfaces; the driving motor (14) is a forward and reverse rotation motor. When the driving motor (14) starts to rotate forward, the outer ends of the support plates (17) abut against the stirring plates (16). When the driving motor (14) starts to rotate in reverse, the outer ends of the support plates (17) leave the stirring plates (16) and are arranged at an inclination and spaced from the stirring plates (16).

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