A spray drying equipment for processing cemented carbide materials

Abstract

The present invention discloses a spray drying device for processing cemented carbide materials, comprising: a drying tank with a rotating nozzle disposed on its upper portion, the feed end of which is pumped to an external material source; a heater with a fixed rim disposed on its lower portion, the heater comprising an annular electrothermal film glass plate enclosedly mounted below the fixed rim, the annular electrothermal film glass plate being arranged in a truncated cone shape with a narrow top and a wide bottom; and a hot air mechanism comprising an air inlet pipe connected to the drying tank inside the annular electrothermal film glass plate, the drying tank being externally connected to a hot air duct, the outlet end of the hot air duct extending into the drying tank and rotatably mounted with an air guide tube, the bottom edge of which being provided with a plurality of corresponding air vents. The present invention can effectively and significantly improve the drying effect and efficiency of cemented carbide 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:

[0007] A spray drying device for processing cemented carbide materials, comprising:

[0008] 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;

[0009] 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;

[0010] The hot air mechanism includes an air inlet pipe connected to a drying tank inside the annular electrothermal film glass plate, the air inlet pipe is connected to an external blower, a corresponding hot air duct is externally connected to the side of the drying tank not provided with the air inlet pipe, the air outlet end of the hot air duct extends into the drying tank and is rotatably mounted with an air guide tube spaced apart from the annular electrothermal film glass plate, the upper portion of the air guide tube is closed, and a plurality of corresponding air holes are evenly distributed on the bottom edge of the air guide tube.

[0011] The air guide tube is rotatably mounted on the hot air duct via a sealed bearing. The air outlet end of the hot air duct is horizontally tilted outward and folded in a constricted shape. The inner side wall of the air guide tube is provided with a serrated convex edge corresponding to the air outlet end of the hot air duct.

[0012] A speed detection sensor for detecting the speed of the air guide tube is installed on the hot air duct. The hot air duct is sealed and connected to the drying tank through a corresponding rubber isolation pad. A corresponding ultrasonic transducer is fixedly installed on the hot air duct on the bottom side of the drying tank. The ultrasonic transducer is connected to an external ultrasonic generating device.

[0013] When the speed detection sensor detects that the speed of the air guide tube is less than the set value v1, it is judged that the amount of material adhered to the air guide tube exceeds the standard. At this time, the ultrasonic generating device can be controlled to start, and the ultrasonic transducer transmits the ultrasonic vibration to the hot air duct. The ultrasonic vibration is transmitted to the air guide tube through the hot air duct, so that the material adhered to the air guide tube falls off in time.

[0014] The outer side wall of the air guide tube is coated with a heat reflection film material layer.

[0015] The annular electric heating film glass plate includes a truncated cone-shaped glass substrate, and a semiconductor electric heating film is sprayed on one end surface of the truncated cone-shaped glass substrate facing the inner wall of the drying tank. The upper and lower ends of the semiconductor electric heating film are respectively fixedly connected to corresponding electrodes, and the electrodes are connected to an external power supply through corresponding electrical controllers.

[0016] The air inlet pipe is provided with a filter, which comprises a filter screen, and dust removal filter cotton and air desiccant material arranged in the filter screen.

[0017] The drying tank is fixedly connected with a discharge pipe equipped with a discharge valve, and the upper side of the drying tank is outwardly connected with an exhaust pipe equipped with an exhaust valve.

[0018] The external material source is stored in a corresponding stirring tank. A stirring shaft driven by a corresponding driving motor is rotatably installed in the stirring tank, and a corresponding stirring plate is fixed to the stirring shaft.

[0019] The inner sides of the stirring plates are respectively provided with corresponding openings, and corresponding support plates are swingably installed at the openings. The inner ends of the support plates are movably embedded in the stirring shafts through elastic parts, and the outer ends of the support plates are connected to the stirring plates through corresponding slope surfaces. The driving motor is a forward and reverse motor. When the driving motor starts to rotate forward, the outer end of the support plate abuts against the stirring plate. When the driving motor starts to reverse, the outer end of the support plate leaves the stirring plate and is arranged at an angle with a distance from the stirring plate.

[0020] Advantages of the present invention:

[0021] 1) The heater of the present invention comprises an annular electrothermal film glass plate sealed and mounted on the lower side of a fixed convex edge, the annular electrothermal film glass plate being arranged in a truncated cone shape with a narrow top and a wide bottom, and the bottom end of the annular electrothermal film glass plate being sealed and connected to the inner side wall of the drying tank; and the hot air mechanism comprises an air inlet pipe connected to the drying tank on the inner side of the annular electrothermal film glass plate, the air inlet pipe being connected to an external blower, a hot air duct being connected outwardly to the side of the drying tank not provided with the air inlet pipe, the air outlet end of the hot air duct extending into the drying tank and being rotatably mounted with an air guide tube spaced apart from the annular electrothermal film glass plate, the upper portion of the air guide tube being sealed, and a plurality of corresponding air holes being evenly distributed at the bottom edge of the air guide tube.

[0022] During the drying process, the material is effectively and evenly distributed into the drying tank through the rotating nozzle, and the external air flows through the gap between the annular electric heating film glass plate and the drying tank to be heated, and then is evenly output outward along the bottom side of the air duct; as the hot air rises upward, it effectively comes into contact with the material in the fixed drying tank, thereby effectively drying the material; most importantly, when the material settles through the gap between the annular electric heating film glass plate and the air duct, it can more fully and evenly contact with the hot air just output, thereby greatly improving the uniformity of contact between the material and the hot air, and the heat emitted by the annular electric heating film glass plate itself and the far-infrared waves can directly act on the material flowing through the gap between the annular electric heating film glass plate and the air duct to heat it, thereby further effectively improving the uniformity of contact between the material and the hot air, and effectively improving the utilization rate of the heat source, thereby effectively and significantly improving the drying effect and drying efficiency of the cemented carbide material.

[0023] 2) The air duct of the present invention is rotatably mounted to the hot air duct via a sealed bearing. The outlet end of the hot air duct is horizontally tilted and folded outward, forming a tapered shape. The inner wall of the air duct is provided with a serrated ridge corresponding to the outlet end of the hot air duct. This effectively drives the air duct to rotate during the hot air transmission process through the scouring force, allowing the air duct to output hot air while rotating. This effectively improves the uniformity of the hot air output and reduces the probability of material adhering to the air duct, thereby effectively enhancing the practical effect of the present invention.

[0024] 3) The hot air duct of the present invention is equipped with a speed detection sensor that can detect the rotational speed of the air duct. The hot air duct is sealed and connected to the drying can through a corresponding rubber isolation pad, and a corresponding ultrasonic transducer is fixedly installed on the hot air duct on the bottom side of the drying can. When the speed detection sensor detects that the speed of the air duct is less than the set value v1, it is determined that the amount of material adhering to the air duct exceeds the standard. At this time, the ultrasonic generating device can be controlled to start, and the ultrasonic transducer transmits the ultrasonic vibration to the hot air duct. The ultrasonic vibration is transmitted to the air duct through the hot air duct, causing the material adhering to the air duct to fall off in time. In this way, the problem of material adhering to the air duct can be effectively further overcome while maintaining the normal operation of the present invention, thereby further effectively improving the practical effect of the present invention.

[0025] 4) The outer wall of the air duct of the present invention is coated with a heat-reflecting film material layer to reflect the heat emitted by the annular electric heating film glass plate and the far-infrared waves back to between the air duct and the annular electric heating film glass plate, thereby further effectively improving the utilization rate of the heat source of the present invention.

[0026] 5) The inner side of the stirring plate for breaking up the material source of the present invention is respectively provided with corresponding openings, and the corresponding support plates are swingably installed at the openings. The inner ends of the support plates are movably embedded in the stirring shafts through elastic parts, and the outer ends of the support plates are connected to the stirring plates through corresponding sloped surfaces, and the driving motor for driving the stirring plates is a forward and reverse motor. When the material source is just put into place, the driving motor first starts to rotate forward so that the outer end of the support plate abuts against the stirring plate, thereby expanding the stirring area to enhance the effect of breaking up the material (slurry); when the material is fully broken up, the driving motor starts to reverse so that the outer end of the support plate leaves the stirring plate and is spaced apart from the stirring plate in an inclined shape to reduce the stirring surface, thereby reducing the force on the entire stirring mechanism. In this way, the material can be quickly broken up, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention.

[0028] Figure 2 It is a structural schematic diagram of the annular electric heating film glass plate.

[0029] Figure 3 Schematic diagram of the filter structure.

[0030] Figure 4 Schematic diagram of the assembly of the support plate, stirring plate and stirring shaft.

[0031] Figure 5 This is a diagram of the usage status when the support plate and stirring plate are arranged at intervals.

[0032] In the accompanying drawings: drying tank 1, rotating nozzle 101, fixed convex edge 102, heater 2, annular electric heating film glass plate 201, truncated cone-shaped glass substrate 2011, semiconductor electric heating film 2012, electrode 2013, heat reflective film material layer 202, hot air mechanism 3, air inlet pipe 301, hot air duct 302, air guide tube 303, air vent 3031, sealed bearing 4, serrated convex edge 5, speed detection sensor 6, rubber isolation pad 7, ultrasonic transducer 8, filter 9, filter screen 901, dust 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. DETAILED DESCRIPTION

[0033] In order to facilitate understanding by those skilled in the art, the structure of the present invention is further described in detail with reference to the embodiments and the accompanying drawings:

[0034] refer to Figure 1-5 , a spray drying device for processing cemented carbide materials, comprising:

[0035] The drying tank 1 is provided with a rotary nozzle 101 on the upper part, and the feed end pump of the rotary nozzle 101 is connected to the external material source;

[0036] Heater 2, a corresponding fixed ridge 102 is provided in the middle of the inner wall of the drying tank 1, and the heater 2 includes an annular electric heating film glass plate 201 sealed and mounted on the lower side of the fixed ridge 102. The annular electric heating film glass plate 201 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 201 is sealed and connected to the inner wall of the drying tank 1;

[0037] The hot air mechanism 3 includes an air inlet pipe 301 connected to the drying tank 1 on the inner side of the annular electrothermal film glass plate 201. The air inlet pipe 301 is connected to an external blower. A corresponding hot air duct 302 is externally connected to the side of the drying tank 1 not provided with the air inlet pipe 301. The air outlet end of the hot air duct 302 extends into the drying tank 1 and is rotatably mounted with an air guide tube 303 spaced apart from the annular electrothermal film glass plate 201. The upper portion of the air guide tube 303 is sealed, and a plurality of corresponding air holes 3031 are evenly distributed on the bottom edge of the air guide tube 303.

[0038] During the drying process, the material is effectively and evenly distributed into the drying tank 1 through the rotating nozzle 101, and the external air flows through the gap between the annular electric heating film glass plate 201 and the drying tank 1 to be heated, and then is evenly output outward along the bottom side of the air duct 303; as the hot air rises upward, it effectively comes into contact with the material in the fixed drying tank 1, thereby effectively drying the material; most importantly, when the material settles through the gap between the annular electric heating film glass plate 201 and the air duct 303, it can more fully and evenly contact with the hot air just output, thereby greatly improving the uniformity of contact between the material and the hot air, and the heat emitted by the annular electric heating film glass plate 201 itself and the far-infrared waves can directly act on the material flowing through the gap between the annular electric heating film glass plate 201 and the air duct 303 to heat the material, thereby further effectively improving the uniformity of contact between the material and the hot air, and effectively improving the utilization rate of the heat source, thereby effectively and significantly improving the drying effect and drying efficiency of the cemented carbide material.

[0039] The air guide tube 303 is rotatably mounted on the hot air duct 302 via a sealed bearing 4. The outlet end of the hot air duct 302 is horizontally tilted and folded outward, forming a tapered shape. The inner sidewall of the air guide tube 303 is provided with a serrated ridge 5 corresponding to the outlet end of the hot air duct 302. This effectively drives the air guide tube 303 to rotate during the hot air transmission process through the scouring force, allowing the air guide tube 303 to output hot air while rotating. This effectively improves the uniformity of the hot air output and reduces the probability of material adhering to the air guide tube 303, thereby effectively enhancing the practical effect of the present invention.

[0040] A speed detection sensor 6 is installed on the hot air duct 302 to detect the speed of the air guide tube 303. The hot air duct 302 is sealed and connected to the drying tank 1 through a corresponding rubber isolation pad 7. A corresponding ultrasonic transducer 8 is fixedly installed on the hot air duct 302 on the bottom side of the drying tank 1. The ultrasonic transducer 8 is connected to an external ultrasonic generating device.

[0041] When the speed detection sensor 6 detects that the speed of the air guide tube 303 is less than the set value v1, it is determined that the amount of material adhering to the air guide tube 303 exceeds the limit. At this time, the ultrasonic generating device can be controlled to start, and the ultrasonic transducer 8 transmits ultrasonic vibrations to the hot air duct 302. The ultrasonic vibrations are transmitted to the air guide tube 303 through the hot air duct 302, causing the material adhering to the air guide tube 303 to fall off in a timely manner. In this way, the problem of material adhering to the air guide tube 303 can be effectively further overcome while maintaining the normal operation of the present invention, thereby further effectively improving the practical effect of the present invention.

[0042] The outer wall of the air duct 303 is coated with a heat-reflecting film material layer 202 to reflect the heat emitted by the annular electric heating film glass plate 201 and the far-infrared waves back to between the air duct 303 and the annular electric heating film glass plate 201, thereby further effectively improving the utilization rate of the heat source of the present invention.

[0043] The annular electric heating film glass plate 201 includes a truncated cone-shaped glass substrate 2011, and a semiconductor electric heating film 2012 is sprayed on one end surface of the truncated cone-shaped glass substrate 2011 facing the inner wall of the drying tank 1. The upper and lower ends of the semiconductor electric heating film 2012 are respectively fixedly connected to corresponding electrodes 2013, and the electrodes 2013 are connected to an external power supply through corresponding electrical controllers.

[0044] The air inlet pipe 301 is provided with a filter 9 , which includes a filter screen 901 , and dust removal filter cotton 902 and air desiccant material 903 installed in the filter screen 901 .

[0045] A discharge pipe 10 equipped with a discharge valve 1001 is fixedly connected to the drying tank 1 , and an exhaust pipe 12 equipped with an exhaust valve 11 is externally connected to the upper side of the drying tank 1 .

[0046] The external material source is stored in a corresponding stirring tank 13 , in which a stirring shaft 15 driven by a corresponding driving motor 14 is rotatably installed, and a corresponding stirring plate 16 is fixedly connected to the stirring shaft 15 .

[0047] The inner sides of the stirring plates 16 are respectively provided with corresponding openings, and corresponding support plates 17 are swingably installed at the openings. The inner ends of the support plates 17 are movably embedded in the stirring shaft 15 through elastic members 18, and the outer ends of the support plates 17 are connected to the stirring plates 16 through corresponding sloped surfaces. The drive motor 14 is a forward and reverse motor. When the drive motor 14 starts to rotate forward, the outer end of the support plate 17 abuts against the stirring plate 16. When the drive motor 14 starts to reverse, the outer end of the support plate 17 leaves the stirring plate 16 and is spaced apart from the stirring plate 16 in an inclined shape.

[0048] When the material source is just added to the mixing tank 13, the present invention first drives the motor 14 to start forward rotation, so that the outer end of the support plate 17 abuts against the stirring plate 16, thereby expanding the stirring area and improving the material (slurry) dispersion effect; when the material is fully dispersed, the drive motor 14 starts to reverse, so that the outer end of the support plate 17 moves away from the stirring plate 16 and is spaced apart from the stirring plate 16 in an inclined shape, thereby reducing the stirring surface and reducing the force on the entire stirring mechanism. In this way, the material can be dispersed quickly, 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.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A spray drying equipment for processing cemented carbide materials, characterized in that: include: The drying tank (1) is provided with a rotary nozzle (101) on the upper portion, and the feed end pump of the rotary nozzle (101) is connected to an external material source; A heater (2), wherein a corresponding fixed ridge (102) is provided in the middle of the inner side wall of the drying tank (1), and the heater (2) comprises an annular electric heating film glass plate (201) which is sealed and mounted on the lower side of the fixed ridge (102), wherein the annular electric heating film glass plate (201) is arranged in a truncated cone shape which is narrow at the top and wide at the bottom, and the bottom end of the annular electric heating film glass plate (201) is sealed and connected to the inner side wall of the drying tank (1); The hot air mechanism (3) comprises an air inlet pipe (301) connected to the drying tank (1) on the inner side of the annular electrothermal film glass plate (201), the air inlet pipe (301) being connected to an external blower, a corresponding hot air duct (302) being connected outwardly to a side of the drying tank (1) not provided with the air inlet pipe (301), an air outlet end of the hot air duct (302) extending into the drying tank (1) and being rotatably mounted with an air guide tube (303) spaced apart from the annular electrothermal film glass plate (201), the upper portion of the air guide tube (303) being closed, and a plurality of corresponding air holes (3031) being evenly distributed at the bottom edge of the air guide tube (303).

2. The spray drying equipment for processing cemented carbide materials according to claim 1, characterized in that: The air guide tube (303) is rotatably mounted on the hot air duct (302) via a sealing bearing (4); the air outlet end of the hot air duct (302) is tilted and folded horizontally outward and is arranged in a constricted shape; the inner side wall of the air guide tube (303) is provided with a serrated convex edge (5) corresponding to the air outlet end of the hot air duct (302).

3. The spray drying equipment for processing cemented carbide materials according to claim 2, characterized in that: A rotation speed detection sensor (6) capable of detecting the rotation speed of the air guide tube (303) is installed on the hot air duct (302), the hot air duct (302) is sealedly 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) on the bottom side of the drying tank (1), and the ultrasonic transducer (8) is connected to an external ultrasonic generating device.

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

5. The spray drying equipment for processing cemented carbide materials according to claim 1, characterized in that: The outer wall of the air guide tube (303) is coated with a heat reflection film material layer (202).

6. The spray drying equipment for processing cemented carbide materials according to claim 1, characterized in that: The annular electric heating film glass plate (201) comprises a truncated cone-shaped glass substrate (2011), and a semiconductor electric heating film (212) is sprayed on one end surface of the truncated cone-shaped glass substrate (2011) facing the inner wall of the drying tank (1). The upper and lower ends of the semiconductor electric heating film (2012) are respectively fixedly connected to corresponding electrodes (2013), and the electrodes (2013) are connected to an external power supply via corresponding electric controllers.

7. The spray drying equipment for processing cemented carbide materials according to claim 1, characterized in that: The air inlet pipe (301) is provided with a filter (9), and the filter (9) comprises a filter screen (901), and dust removal filter cotton (902) and air desiccant material (903) arranged in the filter screen (901).

8. The spray drying equipment for processing cemented carbide materials according to claim 1, characterized in that: A discharge pipe (10) equipped with a discharge valve (1001) is fixedly connected to the drying tank (1), and an exhaust pipe (12) equipped with an exhaust valve (11) is externally connected to 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), and a stirring shaft (15) driven by a corresponding driving motor (14) is rotatably installed in the stirring tank (13), and a corresponding stirring plate (16) is fixed to the stirring shaft (15).

10. The spray drying equipment for processing cemented carbide materials according to claim 9, characterized in that: The inner sides of the stirring plates (16) are respectively provided with corresponding openings, and corresponding support plates (17) are swingably installed at the openings. The inner ends of the support plates (17) are movably embedded in the stirring shaft (15) through elastic members (18), and the outer ends of the support plates (17) are connected to the stirring plates (16) through corresponding slope surfaces. The driving motor (14) is a forward and reverse 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 reversely, the outer ends of the support plates (17) leave the stirring plates (16) and are spaced apart from the stirring plates (16) in an inclined shape.

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