Internal circulation ultrafine grinder

Abstract

The invention discloses an internal circulation ultrafine grinder. The internal circulation ultrafine grinder comprises an ultrafine grinding device, a cyclone circulation device and a cooling device, the superfine grinding device comprises a machine table, a grinding mechanism, a feeding mechanism and a cyclone separation barrel, the grinding mechanism comprises a driving motor, a grinding bin and a grinding disc, a feeding port and a discharging port are formed in the two sides of the grinding bin respectively, the feeding port is connected with the feeding mechanism, and the discharging port is connected with the cyclone separation barrel; the cyclone circulating device comprises a cyclone cooling cylinder, a cyclone generating mechanism and a receiving cylinder, an air inlet and a first air outlet are formed in the upper end and the lower end of the cyclone cooling cylinder respectively, a second air outlet is formed in the upper end of the cyclone separating cylinder, an air suction port is formed in the feeding mechanism, and the air inlet is connected with the second air outlet through an air outlet connecting pipe; the air suction port is connected with the first air outlet through an air return connecting pipe. Exhaust gas generated in the crushing process returns to the superfine crushing device after being cooled, and is not directly exhausted outwards, so that not only is the production cost lower, but also more energy-saving and environment-friendly effects are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of powder making equipment, in particular to an internal circulation superfine pulverizer. Background Art

[0002] Ultrafine pulverizer is a kind of equipment used for micro-pulverization of materials. The working principle of ultrafine pulverizer is that mechanical pulverization and gas collision are used to achieve the purpose of finished products. The crushed materials enter the classification area with the airflow, and the classifier selects the required material fineness. The coarse materials that are not selected return to the grinding chamber to continue to be crushed until they are crushed to the required fineness, and then are sorted out by the classifier. The airflow carrying fine powder is sent to the cyclone separator to separate the fine powder from the airflow.

[0003] At present, many pulverizers on the market are equipped with dust removal systems. Because the airflow generated by the pulverization process carries a certain amount of powder, it cannot be directly discharged to the external environment. To solve this problem, filtering methods are generally used. The installation of filtering systems not only increases investment, but also has the risk of cross contamination. Summary of the invention

[0004] The purpose of the present invention is to provide an internal circulation ultrafine pulverizer. The present invention does not require an additional dust removal and filtering system. The exhaust gas generated during the pulverizing process will be returned to the ultrafine pulverizing device after cooling, and will not be directly exhausted to the outside. Not only is the production cost lower, but it is also more energy-saving and environmentally friendly.

[0005] To achieve the above object, the present invention provides the following technical solution: an internal circulation ultrafine pulverizer, comprising an ultrafine pulverizing device, a cyclone circulation device and a cooling device; The ultrafine pulverizing device comprises a machine platform, a pulverizing mechanism arranged on the machine platform, a feeding mechanism and a cyclone separation cylinder, the pulverizing mechanism comprises a fixed seat, a support, a driving motor, a pulverizing bin and a pulverizing disk, the driving motor is installed on the fixed seat, the pulverizing bin is arranged on the support, a pulverizing chamber is arranged in the pulverizing chamber, the pulverizing disk is arranged in the pulverizing chamber, and the motor shaft of the driving motor extends into the pulverizing chamber and is linked to the pulverizing disk, a plurality of pulverizing blades are arranged on the pulverizing disk, a feeding port and a discharging port connected to the pulverizing chamber are respectively arranged on both sides of the pulverizing bin, the feeding port is connected to the feeding mechanism, and the discharging port is connected to the cyclone separation cylinder; The cyclone circulation device comprises a cyclone cooling cylinder, a cyclone generating mechanism arranged on the cyclone cooling cylinder, and a receiving cylinder arranged at the bottom of the cyclone cooling cylinder, the upper and lower ends of the cyclone cooling cylinder are respectively provided with an air inlet and a first air outlet, the upper end of the cyclone separation cylinder is provided with a second air outlet, the feeding mechanism is provided with an air intake, the air inlet is connected to the second air outlet through an air outlet connecting pipe, and the air intake is connected to the first air outlet through an air return connecting pipe; The cooling device is used to cool the inside of the cyclone cooling cylinder.

[0006] By adopting the above technical solution, the exhaust gas generated during the pulverizing process of the ultrafine pulverizing device is cooled by a cyclone cooling cylinder and then returned to the feeding mechanism of the ultrafine pulverizing device. It is not directly exhausted to the outside, and does not require an additional dust removal and filtration system. Not only is the production cost lower, but it is also more energy-saving and environmentally friendly.

[0007] The present invention is further configured such that the cooling device includes a water chiller, the cyclone cooling cylinder is a double-layer structure, so that a cooling space is formed inside the cyclone cooling cylinder, and the lower side and upper side of the cyclone cooling cylinder are respectively provided with a coolant inlet and a coolant outlet connected to the cooling space, and the coolant inlet and the coolant outlet are respectively connected to the water chiller through a coolant inlet pipe and a coolant return pipe.

[0008] By adopting the above technical solution, the coolant circulation structure is used to reduce the air flow temperature in the cyclone cooling cylinder.

[0009] The present invention is further configured such that a cyclone coolant temperature sensor is installed at the side of the cyclone cooling cylinder, and a grinder outlet temperature and humidity sensor is installed at the air inlet of the cyclone cooling cylinder.

[0010] By adopting the above technical scheme, a microcomputer control system is used as a processing unit, a cyclone coolant temperature sensor and a grinder outlet temperature and humidity sensor are electrically connected to the microcomputer control system, the cyclone coolant temperature sensor transmits temperature information to the microcomputer control system in real time, and the microcomputer control system controls the outlet water temperature (water supply temperature) of the chiller; the grinder outlet temperature and humidity sensor is used to control the coolant inlet temperature of the cyclone cooling cylinder (it can also be the outlet temperature of the chiller), and the purpose of controlling the coolant temperature is to prevent water from condensing on the inner wall of the cyclone cooling cylinder. Water condensation directly causes the powder in the mixed gas to become damp and stick to the inner wall of the cyclone cooling cylinder, and normal circulation and cooling cannot be achieved. Therefore, a grinder outlet temperature and humidity sensor is installed at the air inlet of the cyclone cooling cylinder (it can also be the second air outlet of the cyclone separation cylinder) to control the temperature and humidity of the inner wall of the cyclone cooling cylinder to be lower than the dew point temperature and humidity of the mixed gas coming out of the ultra-fine pulverizing device.

[0011] The present invention is further configured such that a cooler barrel cover is detachably installed on the top of the cyclone cooling cylinder, and the cyclone generating mechanism includes a cooler stirring motor installed on the cooler barrel cover, the motor shaft of the cooler stirring motor extends into the interior of the cyclone cooling cylinder and is connected to first stirring blades distributed in a circular array, and the first stirring blades are arranged on the motor shaft of the cooler stirring motor at an angle to the vertical plane.

[0012] By adopting the above technical solution, the cooling machine stirring motor drives the blades to rotate, and the gas and powder mixture in the cyclone cooling cylinder is thrown onto the inner wall of the cyclone cooling cylinder and spirally rotated downward (because the mixed gas blown out by the ultrafine grinding device enters from the top, the first air outlet of the cyclone cooling cylinder is connected to the air intake on the feeding mechanism of the ultrafine grinding device). The mixed gas rotating along the inner wall of the cyclone cooling cylinder is cooled by the inner wall contact process cooled by the coolant, thereby realizing the cooling of the outlet gas (that is, the air intake of the ultrafine grinding device) in turn.

[0013] The present invention is further configured such that a discharge butterfly valve is provided between the cyclone cooling cylinder and the material receiving cylinder.

[0014] By adopting the above technical solution, when the receiving barrel needs to be replaced, the discharge butterfly valve is first closed, and then the powder in the receiving barrel is poured out or replaced.

[0015] The present invention is further configured such that the feeding mechanism includes a hopper, a hopper cover detachably arranged on the top of the hopper, a feeding and stirring motor arranged on the hopper cover, and a fork-type feeder arranged at the feeding port of the hopper, and the motor shaft of the feeding and stirring motor extends into the interior of the hopper and is connected to a second stirring blade distributed in a circular array.

[0016] By adopting the above technical solution, the material in the hopper is stirred by the second stirring blade driven by the feeding stirring motor installed on the hopper cover, which facilitates the smooth feeding of the fork feeder (the fork wheel or screw driven by the feeding motor).

[0017] The present invention is further configured such that the crushing disk divides the interior of the crushing chamber into a first crushing zone and a second crushing zone, a crushing channel connecting the first crushing zone and the second crushing zone is provided between the peripheral side of the crushing disk and the inner wall of the crushing chamber, the crushing blades include a plurality of first blades and a plurality of second blades, the plurality of first blades are arranged in a circular array on one side of the crushing disk located in the first crushing zone, the plurality of second blades are arranged in a circular array on one side of the crushing disk located in the second crushing zone, and the first blades are larger than the second blades.

[0018] By adopting the above technical solution, the first blade and the second blade play the role of a fan and also play the role of hitting the material during crushing. The design that the first blade is larger than the second blade can ensure that the wind pressure in the first crushing area is always greater than the wind pressure in the second crushing area, thereby ensuring that the material is transferred from the first crushing area to the second crushing area during the crushing process.

[0019] The present invention is further configured as follows: the crushing bin includes a bin body with an opening on one side and a bin cover hinged at the open end of the bin body and capable of closing the bin body opening through a locking assembly; the discharge port is arranged at a position of the bin cover close to the edge; two threaded mounting parts are symmetrically arranged on the outer circumference of the crushing bin, locking screw shafts are passed through the two threaded mounting parts, a clamping handle is connected to the locking screw shaft, the clamping handle includes a connecting rod and an annular sleeve and a pressure head arranged at both ends of the connecting rod, the annular sleeve is arranged on the locking screw shaft at a position between the two threaded mounting parts, a locking flange is provided on the peripheral side of the bin cover, and a locking groove corresponding to the connecting rod is opened on the locking flange, and when the bin cover is buckled on the open end of the bin body, the clamping handle is rotated to make the connecting rod stuck in the locking groove, and the pressure head is pressed against the outer side wall of the bin cover.

[0020] By adopting the above technical solution, when closing the bin cover of the crushing bin, the clamping handle is rotated so that the pressure head on the clamping handle is tightly pressed against the outer wall of the bin cover to lock the bin cover to prevent powder leakage when crushing materials.

[0021] The present invention is further configured such that a discharge port is provided at the bottom of the cyclone separation barrel, and a first discharge butterfly valve and a second discharge butterfly valve are vertically installed in sequence at the discharge port.

[0022] By adopting the above technical solution, the first unloading butterfly valve and the second unloading butterfly valve, the two unloading butterfly valves are cross-switched to realize unloading.

[0023] The present invention is further configured such that an exhaust assembly and an intake assembly are also provided on the air intake port, the exhaust assembly includes an exhaust pressure sensor, an exhaust solenoid valve and an exhaust filter connected in sequence, and the intake assembly includes an intake pressure sensor and an intake solenoid valve connected in sequence.

[0024] By adopting the above technical solution, the pressure balance in the pulverizing system is achieved through the exhaust component and the air intake component. The air intake component can be connected to external protective gas and cold air (protective gas is used to reduce the air content in the pulverizing system to ensure that the properties of the material pulverizing process remain unchanged. Adding appropriate cold air can reduce the temperature, but the added air pressure cannot be higher than the set pressure of the exhaust solenoid valve). BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A perspective view of the present invention as a whole; Figure 2 It is a structural schematic diagram of the ultrafine grinding device of the present invention; Figure 3 is a cross-sectional view of the ultrafine grinding device of the present invention; Figure 4 It is a cross-sectional view of the cyclone circulation device of the present invention.

[0026] In the figure: 1. Ultrafine grinding device; 2. Cyclone circulation device; 3. Cooling device; 4. Machine; 5. Grinding mechanism; 6. Feeding mechanism; 7. Cyclone separation cylinder; 8. Fixed seat; 9. Support; 10. Driving motor; 11. Grinding disk; 12. Grinding chamber; 13. Grinding blades; 14. Feeding port; 15. Discharging port; 16. Cyclone cooling cylinder; 17. Cyclone generating mechanism; 18. Receiving cylinder; 19. Air inlet; 20. First air outlet; 21. Second air outlet; 22. Air intake; 23. Air outlet connecting pipe; 24. Air return connecting pipe; 25. Chiller; 26. Cooling space; 28. Coolant inlet; 27. Coolant outlet; 30. Coolant water inlet pipe; 29. ​​Coolant water return pipe; 31. Cyclone coolant temperature sensor; 32. Grinding machine outlet temperature and humidity sensor; 33. Cooling machine barrel cover; 34. Cooling machine stirring Motor; 35, first stirring blade; 36, discharge butterfly valve; 37, hopper; 38, hopper cover; 39, feeding stirring motor; 40, fork feeder; 41, second stirring blade; 42, first crushing zone; 43, second crushing zone; 44, crushing channel; 45, first blade; 46, second blade; 47, bin body; 48, locking assembly; 49, bin cover; 50, threaded mounting portion; 51, locking screw shaft; 52, clamping handle; 53, connecting rod; 54, annular sleeve; 55, pressure head; 56, locking flange; 57, locking groove; 58, discharge port; 59, first discharge butterfly valve; 60, second discharge butterfly valve; 61, exhaust assembly; 62, air intake assembly; 63, exhaust pressure sensor; 64, exhaust solenoid valve; 65, exhaust filter; 66, air intake pressure sensor; 67, air intake solenoid valve; 68, crushing bin. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Example: As attached Figures 1 to 4 The internal circulation superfine pulverizer shown is a self-priming type, does not require an external auxiliary air induction or blowing system, and includes a superfine pulverizing device 1, a cyclone circulation device 2, a cooling device 3 and a microcomputer control system, wherein the superfine pulverizing device 1 itself has an air suction and exhaust function; The ultrafine pulverizing device 1 includes a machine table 4, a pulverizing mechanism 5 arranged on the machine table 4, a feeding mechanism 6 and a cyclone separation drum 7, the pulverizing mechanism 5 includes a fixed seat 8, a support 9, a driving motor 10, a pulverizing bin 68 and a pulverizing disk 11, the driving motor 10 is installed on the fixed seat 8, the pulverizing bin 68 is arranged on the support 9, a pulverizing chamber 12 is arranged in the pulverizing bin 68, the pulverizing disk 11 is arranged in the pulverizing chamber 12, and the motor shaft of the driving motor 10 extends into the pulverizing chamber 12 and is linked to the pulverizing disk 11, a plurality of pulverizing blades 13 are arranged on the pulverizing disk 11, and a feed port 14 and a discharge port 15 connected to the pulverizing chamber 12 are respectively arranged on both sides of the pulverizing bin 68, the feed port 14 is connected to the feeding mechanism 6, and the discharge port 15 is connected to the cyclone separation drum 7; The cyclone circulation device 2 includes a cyclone cooling cylinder 16, a cyclone generating mechanism 17 arranged on the cyclone cooling cylinder 16, and a receiving cylinder 18 arranged at the bottom of the cyclone cooling cylinder 16. The upper and lower ends of the cyclone cooling cylinder 16 are respectively provided with an air inlet 19 and a first air outlet 20. The upper end of the cyclone separation cylinder 7 is provided with a second air outlet 21. The feeding mechanism 6 is provided with an air intake 22. The air inlet 19 is connected to the second air outlet 21 through an air outlet connecting pipe 23, and the air intake 22 is connected to the first air outlet 20 through a return air connecting pipe 24. The cooling device 3 is used to cool the inside of the cyclone cooling cylinder 16 .

[0029] The exhaust gas generated during the pulverizing process of the ultrafine pulverizing device 1 is cooled by the cyclone cooling cylinder 16 and then returned to the feeding mechanism 6 of the ultrafine pulverizing device 1. It is not directly exhausted to the outside, and no additional dust removal and filtering system is required. Not only is the production cost lower, but it is also more energy-saving and environmentally friendly.

[0030] As attached Figure 1 and attached Figure 4 As shown, the cooling device 3 includes a chiller 25, and the cyclone cooling cylinder 16 is a double-layer structure, so that a cooling space 26 is formed in the cyclone cooling cylinder 16, and the lower side and upper side of the cyclone cooling cylinder 16 are respectively provided with a coolant inlet 28 and a coolant outlet 27 connected to the cooling space 26, and the coolant inlet 28 and the coolant outlet 27 are respectively connected to the chiller 25 through a coolant inlet pipe 30 and a coolant return pipe 29, and circulating cooling water (or other coolants) is injected into the cooling space 26, and this cooling water circulates to reduce the temperature of the air flow entering the cyclone cooling cylinder 16.

[0031] As attached Figure 1As shown, a cyclone coolant temperature sensor 31 is installed at the side of the cyclone cooling cylinder 16 , and a grinder outlet temperature and humidity sensor 32 is installed at the air inlet 19 of the cyclone cooling cylinder 16 . A microcomputer control system is used as a processing unit, and a cyclone coolant temperature sensor 31 and a grinder outlet temperature and humidity sensor 32 are electrically connected to the microcomputer control system. The cyclone coolant temperature sensor 31 transmits temperature information to the microcomputer control system in real time, and the microcomputer control system controls the outlet water temperature (water supply temperature) of the chiller 25; the grinder outlet temperature and humidity sensor 32 is used to control the temperature of the coolant inlet 28 of the cyclone cooling cylinder 16 (it can also be the outlet temperature of the chiller 25). The purpose of controlling the coolant temperature is to prevent water from condensing on the inner wall of the cyclone cooling cylinder 16. Water condensation directly causes the powder in the mixed gas to become damp and stick to the inner wall of the cyclone cooling cylinder 16, and normal circulation and cooling cannot be achieved. Therefore, the grinder outlet temperature and humidity sensor 32 is installed at the air inlet 19 of the cyclone cooling cylinder 16 (it can also be the second air outlet 21 of the cyclone separation cylinder 7) to control the temperature and humidity of the inner wall of the cyclone cooling cylinder 16 to be lower than the dew point temperature and humidity of the mixed gas coming out of the ultra-fine pulverizing device 1.

[0032] As attached Figure 1 and attached Figure 4 As shown, a cooler barrel cover 33 is detachably mounted on the top of the cyclone cooling barrel 16, and the cyclone generating mechanism 17 includes a cooler stirring motor 34 mounted on the cooler barrel cover 33, the motor shaft of the cooler stirring motor 34 extends into the interior of the cyclone cooling barrel 16 and is connected to first stirring blades 35 distributed in a circumferential array, and the first stirring blades 35 are arranged on the motor shaft of the cooler stirring motor 34 in an inclined manner to the vertical plane. The cooler stirring motor 34 drives the blades to rotate, and the gas and powder mixture in the cyclone cooling barrel 16 is thrown onto the inner wall of the cyclone cooling barrel 16 and spirally rotated downward (because the mixed gas blown out of the ultrafine pulverizing device 1 enters from the top, the first air outlet 20 of the cyclone cooling barrel 16 is connected to the air intake 22 on the feeding mechanism 6 of the ultrafine pulverizing device 1), and the mixed gas rotating along the inner wall in the cyclone cooling barrel 16 is cooled by the inner wall contact process cooled by the coolant, and the outlet gas (that is, the air intake of the ultrafine pulverizing device 1) is cooled in turn.

[0033] As attached Figure 4 As shown, a discharge butterfly valve 36 is also provided between the cyclone cooling cylinder 16 and the receiving cylinder 18. When the receiving cylinder 18 needs to be replaced, the discharge butterfly valve 36 is first closed, and then the powder in the receiving cylinder 18 is poured out or replaced.

[0034] As attached Figure 2 and attached Figure 3As shown, the feeding mechanism 6 includes a hopper 37, a hopper cover 38 detachably arranged on the top of the hopper 37, a feeding stirring motor 39 arranged on the hopper cover 38, and a fork feeder 40 arranged at the feeding port of the hopper 37. The motor shaft of the feeding stirring motor 39 extends into the interior of the hopper 37 and is connected with second stirring blades 41 distributed in a circumferential array. The upper end of the hopper cover 38 is connected to an external vacuum feeder, and the air intake 22 is arranged at the bottom of the hopper 37. The material in the hopper 37 is stirred by the second stirring blade 41 driven by the feeding stirring motor 39 installed on the hopper cover 38 to rotate, so that the fork feeder 40 (the fork wheel or screw driven by the feeding motor) can feed smoothly. In addition, the material level control can be achieved by setting two rotary resistance material level switches (one controls the upper limit of the material level and the other controls the lower limit of the material level).

[0035] As attached Figure 3 As shown, the crushing disk 11 divides the interior of the crushing chamber 12 into a first crushing area 42 and a second crushing area 43, and a crushing channel 44 is provided between the circumference of the crushing disk 11 and the inner wall of the crushing chamber 12, which connects the first crushing area 42 and the second crushing area 43. The crushing blades 13 include a plurality of first blades 45 and a plurality of second blades 46. The plurality of first blades 45 are arranged in a circumferential array on one side of the crushing disk 11 located in the first crushing area 42, and the plurality of second blades 46 are arranged in a circumferential array on one side of the crushing disk 11 located in the second crushing area 43, and the first blades 45 are larger than the second blades 46. The first blades 45 and the second blades 46 act as fans and also play a role in striking materials during crushing. The design that the first blades 45 are larger than the second blades 46 can achieve that the wind pressure in the first crushing area 42 is always greater than the wind pressure in the second crushing area 43, thereby ensuring that the materials are transferred from the first crushing area 42 to the second crushing area 43 during the crushing process.

[0036] As attached Figure 2As shown, the crushing bin 68 includes a bin body 47 with an opening on one side and a bin cover 49 hinged to the open end of the bin body 47 and capable of closing the opening of the bin body 47 through a locking assembly 48. The discharge port 15 is arranged at a position close to the edge of the bin cover 49. Two threaded mounting portions 50 are symmetrically arranged on the periphery of the crushing bin 68. Locking screw shafts 51 are passed through the two threaded mounting portions 50. A clamping handle 52 is connected to the locking screw shaft 51. The clamping handle 52 includes a connecting rod 53 and a setting The annular sleeve 54 and the pressure head 55 at both ends of the connecting rod 53 are sleeved on the locking screw shaft 51 at a position between the two threaded mounting parts 50. The circumferential side of the bin cover 49 is provided with a locking flange 56, and the locking flange 56 is provided with a locking groove 57 corresponding to the connecting rod 53. When the bin cover 49 is buckled on the open end of the bin body 47, the pressing handle 52 is rotated to make the connecting rod 53 stuck in the locking groove 57, and the pressure head 55 is pressed against the outer wall of the bin cover 49. When the bin cover 49 of the crushing bin 68 is closed, the pressing handle 52 is rotated to make the pressure head 55 on the pressing handle 52 tightly press against the outer wall of the bin cover 49, and the bin cover 49 is locked to prevent powder leakage when crushing materials.

[0037] As attached Figure 2 As shown, the bottom of the cyclone separation cylinder 7 is provided with a discharge port 58, and the discharge port 58 is vertically and sequentially installed with a first discharge butterfly valve 59 and a second discharge butterfly valve 60. The first discharge butterfly valve 59 and the second discharge butterfly valve 60 are cross-switched to realize discharge.

[0038] As attached Figure 2 As shown, the air inlet 22 is also provided with an exhaust component 61 and an air intake component 62, wherein the exhaust component 61 includes an exhaust pressure sensor 63, an exhaust solenoid valve 64 and an exhaust filter 65 connected in sequence, and the air intake component 62 includes an air intake pressure sensor 66 and an air intake solenoid valve 67 connected in sequence. The pressure balance in the pulverizing system is achieved through the exhaust component 61 and the air intake component 62, and the air intake component 62 can be connected to external protective gas and cold air (protective gas is used to reduce the air content in the pulverizing system to ensure that the properties of the material pulverizing process remain unchanged, and adding appropriate cold air can reduce the temperature, but the added air pressure cannot be higher than the set pressure of the exhaust solenoid valve 64).

[0039] To facilitate explanation and understanding, the following concepts are described: a. Dew point temperature of gas and water vapor mixture. The dew point temperature is the temperature of water vapor and gas mixture when dew is produced, which is a phase change temperature (gas phase changes into liquid). The main factors affecting the dew point in the mixed gas are temperature and the water vapor content in the mixed gas. The dew point is higher as the temperature rises, and the dew point is also higher as the water vapor content rises. The cooling principle adopted by this internal circulation ultrafine pulverizer is the direct contact between the hot mixed gas (temperature rise is inevitable during the material pulverization process) and the inner wall of the cyclone cooling cylinder 16. Therefore, the inner wall temperature of the cyclone cooling cylinder 16 must be strictly controlled and cannot be lower than the dew point temperature of the mixed gas.

[0040] b. The seal of the pulverizing system and the pressure inside the system; the whole pulverizing system should be kept sealed (except for the cross butterfly valve unloading) and maintain a weak positive pressure state. High pressure will affect the powder spraying during discharge and air leakage in some connection parts. Too low pressure will affect the discharge and mixed gas circulation (it is difficult for the butterfly valve to unload automatically under negative pressure, affecting the system circulation and cooling). In addition, the pulverizing system can add appropriate cooling gases such as nitrogen and protective gases according to the temperature requirements of the material and the characteristics of the pulverized material.

Claims

1. Internal circulation ultrafine pulverizer, characterized by: It comprises an ultrafine grinding device (1), a cyclone circulation device (2) and a cooling device (3); The ultrafine pulverizing device (1) comprises a machine platform (4), a pulverizing mechanism (5) arranged on the machine platform (4), a feeding mechanism (6) and a cyclone separation cylinder (7); the pulverizing mechanism (5) comprises a fixed seat (8), a support (9), a driving motor (10), a pulverizing chamber (68) and a pulverizing disk (11); the driving motor (10) is mounted on the fixed seat (8); the pulverizing chamber (68) is arranged on the support (9); a pulverizing chamber (12) is arranged in the pulverizing chamber (68); and the pulverizing chamber (11) is provided with a pulverizing chamber (12). The disk (11) is arranged in a pulverizing chamber (12), and the motor shaft of the driving motor (10) extends into the pulverizing chamber (12) and is linked to the pulverizing disk (11), the pulverizing disk (11) is provided with a plurality of pulverizing blades (13), and the two sides of the pulverizing bin (68) are respectively provided with a feed port (14) and a discharge port (15) which are connected to the pulverizing chamber (12), the feed port (14) is connected to a feeding mechanism (6), and the discharge port (15) is connected to a cyclone separation cylinder (7); The cyclone circulation device (2) comprises a cyclone cooling cylinder (16), a cyclone generating mechanism (17) arranged on the cyclone cooling cylinder (16), and a receiving cylinder (18) arranged at the bottom of the cyclone cooling cylinder (16); the cyclone cooling cylinder (16) is provided with an air inlet (19) and a first air outlet (20) at the upper and lower ends thereof, respectively; the cyclone separation cylinder (7) is provided with a second air outlet (21) at the upper end thereof; the feeding mechanism (6) is provided with an air intake (22); the air inlet (19) is connected to the second air outlet (21) via an air outlet connecting pipe (23); and the air intake (22) is connected to the first air outlet (20) via an air return connecting pipe (24); The cooling device (3) is used to cool the interior of the cyclone cooling cylinder (16).

2. The internal circulation ultrafine pulverizer according to claim 1, characterized in that: The cooling device (3) comprises a water chiller (25). The cyclone cooling cylinder (16) is a double-layer structure, so that a cooling space (26) is formed in the cyclone cooling cylinder (16). The lower side and upper side of the cyclone cooling cylinder (16) are respectively provided with a cooling liquid inlet (28) and a cooling liquid outlet (27) which are connected to the cooling space (26). The cooling liquid inlet (28) and the cooling liquid outlet (27) are respectively connected to the water chiller (25) through a cooling liquid inlet pipe (30) and a cooling liquid return pipe (29).

3. The internal circulation ultrafine pulverizer according to claim 2, characterized in that: A cyclone coolant temperature sensor (31) is installed on the side of the cyclone cooling cylinder (16), and a pulverizer outlet temperature and humidity sensor (32) is installed at the air inlet (19) of the cyclone cooling cylinder (16).

4. The internal circulation ultrafine pulverizer according to claim 2, characterized in that: A cooler barrel cover (33) is detachably mounted on the top of the cyclone cooling cylinder (16); the cyclone generating mechanism (17) comprises a cooler stirring motor (34) mounted on the cooler barrel cover (33); the motor shaft of the cooler stirring motor (34) extends into the interior of the cyclone cooling cylinder (16) and is connected to first stirring blades (35) distributed in a circumferential array; and the first stirring blades (35) are arranged on the motor shaft of the cooler stirring motor (34) in an inclined manner relative to a vertical plane.

5. The internal circulation ultrafine pulverizer according to claim 4, characterized in that: A material discharging butterfly valve (36) is also provided between the cyclone cooling cylinder (16) and the material receiving cylinder (18).

6. The internal circulation ultrafine pulverizer according to claim 1, characterized in that: The feeding mechanism (6) comprises a hopper (37), a hopper cover (38) detachably arranged on the top of the hopper (37), a feeding and stirring motor (39) arranged on the hopper cover (38), and a fork-type feeder (40) arranged at the feeding port of the hopper (37); the motor shaft of the feeding and stirring motor (39) extends into the interior of the hopper (37) and is connected to second stirring blades (41) distributed in a circumferential array.

7. The internal circulation ultrafine pulverizer according to claim 1, characterized in that: The pulverizing disk (11) divides the interior of the pulverizing chamber (12) into a first pulverizing zone (42) and a second pulverizing zone (43); a pulverizing channel (44) connecting the first pulverizing zone (42) and the second pulverizing zone (43) is provided between the circumferential side of the pulverizing disk (11) and the inner wall of the pulverizing chamber (12); the pulverizing blades (13) include a plurality of first blades (45) and a plurality of second blades (46); the plurality of first blades (45) are arranged in a circumferential array on one side of the pulverizing disk (11) located in the first pulverizing zone (42); the plurality of second blades (46) are arranged in a circumferential array on one side of the pulverizing disk (11) located in the second pulverizing zone (43); and the first blades (45) are larger than the second blades (46).

8. The internal circulation ultrafine pulverizer according to claim 1, characterized in that: The crushing bin (68) comprises a bin body (47) with an opening on one side and a bin cover (49) hinged to the open end of the bin body (47) and capable of closing the bin body (47) opening through a locking assembly (48); the discharge port (15) is arranged at a position close to the edge of the bin cover (49); two threaded mounting portions (50) are symmetrically arranged on the outer periphery of the crushing bin (68); locking screw shafts (51) are passed through the two threaded mounting portions (50); a clamping handle (52) is connected to the locking screw shaft (51); the clamping handle (52) comprises a connecting rod (53) and a connecting rod (53) arranged on the connecting rod. The invention relates to an annular sleeve (54) and a pressure head (55) at both ends of the storage body (53), wherein the annular sleeve (54) is sleeved on the locking screw shaft (51) between the two threaded mounting parts (50), and a locking flange (56) is provided on the peripheral side of the storage cover (49), and the locking flange (56) is provided with a locking groove (57) corresponding to the connecting rod (53). When the storage cover (49) is buckled on the open end of the storage body (47), the clamping handle (52) is rotated to make the connecting rod (53) stuck in the locking groove (57), and the pressure head (55) is pressed against the outer wall of the storage cover (49).

9. The internal circulation ultrafine pulverizer according to claim 1, characterized in that: The bottom of the cyclone separation cylinder (7) is provided with a discharge port (58), and a first discharge butterfly valve (59) and a second discharge butterfly valve (60) are vertically installed in sequence at the discharge port (58).

10. The internal circulation ultrafine pulverizer according to claim 1, characterized in that: The air intake port (22) is also provided with an exhaust assembly (61) and an intake assembly (62), wherein the exhaust assembly (61) comprises an exhaust pressure sensor (63), an exhaust solenoid valve (64) and an exhaust filter (65) which are connected in sequence, and the intake assembly (62) comprises an intake pressure sensor (66) and an intake solenoid valve (67) which are connected in sequence.

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