Grinding equipment

Abstract

The utility model provides grinding equipment. The grinding equipment comprises a feeding mechanism, a crushing chamber, a grading device, a cyclone separator, a cooling system and a temperature control device, the feeding mechanism comprises a feeding motor and a feeding hopper, the crushing chamber is arranged below the feeding hopper and communicated with the feeding hopper, the grading device comprises a grading motor and a grading impeller which are arranged at the top of the crushing chamber, and the cyclone separator is arranged on the side portion of the crushing chamber. And the cooling system comprises a cold air pipeline and an air cooler which are communicated with the crushing chamber. The utility model further comprises a mixing and stirring device which is used for mixing and stirring the materials. According to the grinding equipment, the problem that the temperature is too high in the grinding process is solved through the cooling system and the temperature control device, and the dust pollution problem is solved through the sealed mixing and stirring device.

Description

TECHNICAL FIELD

[0001] The utility model relates to material grinding equipment technical field, concretely relates to a grinding equipment. BACKGROUND

[0002] In the process of realizing the present application, the inventor found that the existing grinding equipment has the following problems:

[0003] During the grinding process of the material, a large amount of heat will be generated due to friction. When the temperature of the grinding equipment is too high, the viscosity of the material and the additive will increase, which will prevent the material from being fully pulverized, and the material will also adhere to the equipment, ultimately resulting in an unsatisfactory pulverization effect of the product and uneven particles.

[0004] During the grinding process of the material, the specific gravity of the product and the additive is different, and the additive will be sucked into the dust collector if it is added before grinding, which not only causes waste of the additive, but also leads to uneven mixing of the product.

[0005] When a mixing and stirring device is arranged at the discharge port in the prior art, a large amount of dust will be generated during the stirring process, which not only damages various equipment, but also seriously harms the health of the operator and the surrounding environment.

[0006] When the product enters the mixing and stirring device, the use of the spiral feeding mode is easy to cause blockage of the discharge port due to poor flowability of the material, and continuous blockage will cause damage to the spiral conveying device. SUMMARY

[0007] In view of this, the present application provides a grinding equipment, which solves the problems of high temperature in the grinding process, uneven mixing of the additive, serious dust pollution, and blockage of the material conveying in the prior art.

[0008] The present application provides a grinding equipment, which comprises:

[0009] A feeding mechanism, comprising a feeding motor and a feeding hopper in driving connection with the feeding motor, wherein the feeding hopper is vertically arranged;

[0010] A pulverizing chamber, which is arranged below the feeding hopper and communicates with the feeding hopper, and the pulverizing chamber is a sealed cavity structure;

[0011] A classification device, comprising a classification motor arranged at the top of the pulverizing chamber and a classification impeller coaxially connected with the classification motor;

[0012] A cyclone separator, which is arranged at the side of the pulverizing chamber and communicates with the pulverizing chamber;

[0013] A cooling system, comprising a cold air pipeline arranged on the outer wall of the pulverizing chamber, wherein the cold air pipeline communicates with the inside of the pulverizing chamber, and the cold air pipeline is connected with a cold air fan; and

[0014] A temperature control device is arranged on the inner wall of the crushing chamber and electrically connected with the cold air fan, and is used for detecting the temperature in the crushing chamber.

[0015] Optionally, the device further comprises:

[0016] A cloth bag dust removal bin is vertically arranged below the cyclone separator and is sealingly connected with the discharge end of the cyclone separator;

[0017] A closing fan is arranged at the connection between the cyclone separator and the cloth bag dust removal bin; and

[0018] An air inducing fan is arranged at the top of the cloth bag dust removal bin and is in communication with the cloth bag dust removal bin, and is used for forming a negative pressure suction air flow.

[0019] Optionally, the cloth bag dust removal bin comprises:

[0020] A cylindrical bin body;

[0021] An openable and closable dust removal bin door is hinged to the bin body;

[0022] A cloth bag filter assembly is vertically and suspendingly arranged in the bin body; and

[0023] A conical material guiding part is arranged at the bottom of the bin body.

[0024] Optionally, the crushing chamber further comprises:

[0025] An annular guide ring is fixedly arranged directly below the grading impeller, and is used for guiding the material to the inner wall of the crushing chamber;

[0026] A wear-resistant inner lining plate is fixedly installed on the inner wall of the crushing chamber; and

[0027] A plurality of circumferentially and uniformly distributed crushing hammer heads are detachably installed on the rotor in the crushing chamber.

[0028] Optionally, the temperature control device comprises:

[0029] A temperature sensor is arranged on the inner wall of the crushing chamber;

[0030] An electric control box is fixedly arranged outside the crushing chamber and is in signal connection with the temperature sensor; and

[0031] A control relay is arranged in the electric control box and is electrically connected with the cold air fan and the grading motor, respectively.

[0032] Optionally, the device further comprises a mixing and stirring device, and the mixing and stirring device comprises:

[0033] A sealing stirring bin is connected with the discharge end of the cloth bag dust removal bin through a flange;

[0034] a central stirring shaft arranged horizontally and rotatably in the sealed stirring bin; and

[0035] a spiral stirring blade arranged uniformly along the axial direction of the stirring shaft.

[0036] Optionally, the sealed stirring bin comprises:

[0037] a bin body top plate provided with a feeding port and a sealing cover;

[0038] a bin body side plate sealingly connected to the bin body top plate;

[0039] a conical bottom plate sealingly connected to the bin body side plate;

[0040] an electric discharge valve arranged at the bottom end of the conical bottom plate; and

[0041] a dust collecting device arranged on the bin body top plate and in communication with the feeding port.

[0042] Optionally, the dust collecting device comprises:

[0043] a dust collecting cover fixed on the bin body top plate;

[0044] a dust suction branch pipe in communication with the dust collecting cover;

[0045] a dust removal main pipe in communication with the dust suction branch pipe;

[0046] a dust removal fan connected to the dust removal main pipe; and

[0047] a secondary bag-type dust collector connected to the air outlet of the dust removal fan.

[0048] Optionally, the feeding mechanism further comprises:

[0049] an elevator comprising a fixed support and an elevating mechanism arranged on the support;

[0050] a conveying belt installed on the elevating mechanism;

[0051] a plurality of hoppers fixed uniformly along the length direction of the conveying belt;

[0052] an inclined guide chute arranged at the top of the elevator; and

[0053] a lower hopper connected to the discharge end of the guide chute and in communication with the feeding hopper.

[0054] Optionally, the feeding mechanism further comprises:

[0055] an electromagnetic vibrator fixed on the outer wall of the feeding hopper;

[0056] A material level sensor is installed on the inner wall of the feeding hopper.

[0057] A variable frequency controller is arranged on the feeding motor and electrically connected with the material level sensor.

[0058] The application has the following technical effects:

[0059] The cooling system and the temperature control device are arranged to find and solve the problem of high temperature in the grinding process in time, effectively prevent the increase of viscosity caused by high temperature, and ensure the grinding quality of the product.

[0060] The sealed mixing and stirring device is adopted, and the dust collection system is equipped, which effectively solves the problem of dust pollution in the stirring process, improves the environmental protection of the equipment and the occupational health protection level of the operators.

[0061] The screw feeding mode is changed to the elevator feeding, which avoids the problem of blockage of the material in the conveying process, and improves the running stability and service life of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0062] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description:

[0063] Figure 1 The overall structure schematic diagram of the grinding equipment provided by the embodiment of the application is shown in the figure.

[0064] Figure 2 The top view of the grinding equipment provided by the embodiment of the application is shown in the figure.

[0065] Figure 3 The trace addition system of the grinding equipment provided by the embodiment of the application is shown in the figure.

[0066] The figure shows the feeding motor 10, the feeding hopper 11, the crushing chamber 20, the grading motor 21, the cyclone separator 30, the air lock 31, the bag dust removal bin 40, the dust removal bin door 41, the induced draft fan 50, the cooling system 60, and the temperature control device 70. DETAILED DESCRIPTION

[0067] In order to make the purpose, technical solutions and advantages of the application more clear, the following will further describe the embodiments of the application in combination with the drawings.

[0068] The technical solutions of the application will be described clearly and completely in combination with the drawings.

[0069] As Figure 1 and Figure 2As shown, the grinding device provided by the embodiments of the present application comprises a feeding mechanism, a crushing chamber 20, a grading device, a cyclone separator 30, a cooling system 60, a temperature control device 70 and the like.

[0070] The specific structure and connection relationship of each component will be described in detail.

[0071] The feeding mechanism mainly comprises a feeding motor 10 and a feeding hopper 11. The feeding motor 10 is fixedly installed on the equipment rack through a motor base, and the output shaft thereof is drivingly connected with the feeding hopper 11. The feeding hopper 11 adopts a conical structure and is vertically arranged above the crushing chamber 20. It should be noted that a material level sensor is arranged on the inner wall of the feeding hopper 11, which is used to detect the material storage and adjust the rotating speed of the feeding motor 10 through a frequency conversion controller, so as to realize the quantitative feeding of the material. In addition, an electromagnetic vibrator is also installed on the outer wall of the feeding hopper 11, which is used to prevent the material from accumulating on the inner wall of the feeding hopper 11.

[0072] The crushing chamber 20 is a sealed cavity structure, and the upper portion thereof is in sealed communication with the discharging end of the feeding hopper 11. A crushing device is arranged in the crushing chamber 20, which comprises a crushing rotor arranged in rotation and a plurality of crushing hammer heads fixed on the rotor. A wear-resistant lining plate is installed on the inner wall of the crushing chamber 20, which is used to protect the wall surface of the crushing chamber 20. In addition, a ventilation opening in communication with a cold air pipeline is formed on the side wall of the crushing chamber 20, which is used to introduce cold air.

[0073] A central rotor shaft is also arranged in the crushing chamber 20, which is rotatably installed on the front and rear end walls of the crushing chamber 20 through a bearing seat. One end of the rotor shaft extends out of the crushing chamber 20 and is connected with a driving motor. A plurality of rotor discs are uniformly fixed on the rotor shaft in the circumferential direction, and a plurality of mounting seats are uniformly arranged on the outer periphery of each rotor disc. The crushing hammer heads are rotatably installed on the mounting seats through pins, forming a crushing assembly rotating at high speed around the rotor shaft. The mounting seats of the plurality of rotor discs are arranged in a staggered manner, so that the crushing hammer heads can form uniformly distributed crushing action areas.

[0074] Exemplarily, the central rotor shaft in the crushing chamber 20 is made of 40Cr quenched and tempered alloy steel material, the shaft diameter is 120 mm, the surface is subjected to high-frequency quenching treatment, the hardness reaches HRC52-56, and precise grinding is performed to ensure that the coaxiality error is controlled within 0.02 mm. The two ends of the rotor shaft are supported by double-row self-aligning roller bearing seats, and the bearing type is 22220, which has strong impact resistance and automatic self-aligning function. The bearing seat adopts a split structure, and a labyrinth oil seal and a dust cover are arranged therein, so as to ensure that the lubricating grease does not leak and dust cannot enter.

[0075] The driving end of the rotor shaft is connected with a 75 kW frequency conversion motor through an elastic coupling. The coupling adopts a diaphragm type structure and can compensate axial, radial and angular deviations. The motor is installed on the base through a sliding block guide rail, which is convenient for adjusting the belt tension. The driving motor adopts frequency conversion control, and the speed can be steplessly adjusted within the range of 500-1500 rpm to adapt to the crushing requirements of different materials.

[0076] Eight rotor discs are uniformly arranged on the rotor shaft at every 200 mm along the axial direction. The rotor discs are made of ZG42CrMo steel castings, which are machined after quenching and tempering treatment, and have a thickness of 40 mm and an outer diameter of 580 mm. Each rotor disc is fixed on the rotor shaft through hot fitting and positioning keys, and locking nuts are used to prevent loosening. The outer edge of each rotor disc is uniformly provided with 12 mounting seats, and the mounting seats of adjacent rotor discs are arranged at an angle of 30 degrees, forming staggered crushing areas.

[0077] The mounting seat adopts an integral structure design and is made of high-strength alloy steel and connected with the rotor disc through high-strength bolts. Each mounting seat is provided with a pin shaft hole with a diameter of Φ35 mm. The pin shaft is made of 42CrMo material and is surface nitrided to a hardness of HRC58-62. A bronze bushing is used as a wear-resistant bushing between the pin shaft and the mounting seat, and a lubricating oil groove is designed to ensure smooth rotation of the crushing hammer head.

[0078] The crushing hammer head is made of high-chromium alloy cast iron, with a chromium content of 26%, which has very high wear resistance. The weight of the hammer head is 2.5 kg, and the outer dimensions are 140x90x45 mm. The working surface is specially heat treated, and the surface hardness reaches HRC62-65. The middle part of the hammer head is provided with a pin shaft hole, and the two ends adopt a concave-convex structure design to prevent material adhesion. To ensure dynamic balance, the weight error of the hammer heads on the same circle is controlled within ±5 g.

[0079] The crushing hammer heads on multiple rotor discs form four layers of staggered crushing areas. When the rotor shaft rotates at high speed, the linear speed of the peripheral hammer heads can reach 75 m / s. This staggered arrangement not only improves the crushing efficiency, but also prevents the material from directly passing through the crushing area. At the same time, since the hammer head can rotate freely around the pin shaft, it can automatically swing when encountering excessive impact, thereby playing a self-protection role.

[0080] In order to facilitate maintenance and replacement, the installation of each crushing hammer head adopts a quick release structure. One end of the pin shaft is designed with a matching surface for a special dismounting tool, and the other end is positioned by a elastic retainer. The pin shaft can be quickly dismounted and the worn hammer head can be replaced by using a special tool. At the same time, a maintenance opening corresponding to the installation height of the hammer head is designed at the position of the maintenance door of the crushing chamber, which is convenient for observing the wear condition of the hammer head.

[0081] The dynamic balance precision of the whole crushing assembly reaches G2.5 level, and the vibration value is controlled below 2.5 mm / s at the rated speed. All rotating parts are strictly balanced to ensure the stability of the equipment during high-speed operation. This precise design and manufacturing process make the whole crushing system have high operation reliability and long service life.

[0082] The classification device includes a classification motor 21 and a classification impeller (not shown in the figure). The classification motor 21 is fixedly installed on the top of the crushing chamber 20, and its output shaft penetrates through the top wall of the crushing chamber 20 and is coaxially connected with the classification impeller. An annular guide ring is arranged below the classification impeller, which is used to guide the unqualified materials in particle size to the inner wall of the crushing chamber 20 for secondary crushing.

[0083] The cyclone separator 30 is arranged at the side of the crushing chamber 20 and communicates with the crushing chamber 20 through a connecting pipeline. A cyclone fan 31 is arranged at the lower part of the cyclone separator 30, which is used to control the discharge of the separated materials. It should be noted that the speed of the cyclone fan 31 can be adjusted to adapt to the separation requirements of different materials.

[0084] Exemplarily, the cyclone separator 30 adopts a high-efficiency cyclone separation structure design, the main body is made of Q235B steel plate, the inner wall is treated by corrosion protection and sprayed with wear-resistant ceramic coating. The main diameter of the separator is 1200 mm, the total height is 2800 mm, the cylinder part height is 1600 mm, and the cone part height is 1200 mm. The cone adopts a 60-degree cone angle design to ensure smooth falling of the materials and avoid wall sticking and accumulation. The wear-resistant ceramic coating on the inner wall of the separator has a thickness of 3 mm, a surface roughness Ra≤0.8 μm, and excellent wear resistance and self-cleaning effect.

[0085] The connecting pipeline adopts a spiral tangential feeding structure, the pipeline diameter is 300 mm, and the connection between the pipeline and the crushing chamber 20 is sealed by a flange. The feeding pipeline is inclined downward by 15 degrees, which can increase the tangential velocity of the materials and form stronger centrifugal force. The inner wall of the pipeline is also lined with wear-resistant lining, and replaceable wear-resistant guards are arranged at the key bends. In order to prevent the materials from depositing in the pipeline, a DN50 cleaning port is arranged every 1 meter at the bottom of the pipeline.

[0086] A vortex preventer is arranged at the top of the cyclone separator 30, which adopts a cross-blade structure and can effectively prevent the secondary entrainment phenomenon. The exhaust pipe extends into the cylinder by 400 mm, the pipe diameter is 250 mm, and the upper part is connected with a bag dust removal system. The sinking depth of the exhaust pipe is calculated and optimized to effectively reduce the direct escape of the materials. A pressure detection device is also installed on the exhaust pipeline to monitor the resistance change of the system.

[0087] A star-shaped discharge valve 31 is installed at the lower part of the cyclone separator 30, with a rotor diameter of 500 mm and blades made of wear-resistant alloy steel. The valve 31 is driven by a 7.5 kW frequency conversion motor, with a continuous adjustable speed range of 10-60 rpm. Each blade is spaced 45 degrees apart, forming 8 independent material compartments, with a single compartment volume of about 2 L. The gap between the blade and the casing is adjustable, with a minimum of 0.3 mm to ensure good sealing.

[0088] The inlet and outlet of the valve 31 are each provided with a replaceable wear-resistant lining, made of high chromium alloy cast iron with a hardness of HRC60 or above. The lining is fixed by a special dovetail groove structure, making it easy to replace and maintain. The feed hopper has a conical structure that perfectly matches the discharge outlet of the cyclone separator, preventing material bridging. The lower part of the discharge outlet is provided with a buffer bin to relieve the impact force of the falling material.

[0089] The control system uses a PLC programmable controller with a 7-inch touch screen operation interface. The operation interface can display the valve speed, motor load, material processing capacity and other parameters in real time. The system has automatic and manual control modes. In automatic mode, the valve speed will automatically adjust according to the material quantity. The control cabinet is equipped with overload protection and open-phase protection devices that automatically shut down and alarm when an abnormality is detected.

[0090] To meet the separation needs of different materials, the system has pre-set multiple sets of material parameter schemes. The operator can select the corresponding scheme according to the material characteristics, and the system will automatically adjust the valve speed and other process parameters. At the same time, the system also has a parameter self-learning function, which can optimize the control parameters according to the actual operation data. All operating parameters have a historical record function, which is convenient for later process optimization.

[0091] In terms of maintenance, the bearings of the valve 31 are NSK double-row self-aligning ball bearings, which have an automatic self-aligning function and can withstand large axial and radial loads. The bearing seat has a split structure with a built-in labyrinth oil seal to prevent dust from entering. The equipment needs to be lubricated once every 1000 hours of operation, and the blade gap needs to be checked every 2000 hours, with adjustments made according to the wear condition. All wear parts have spare part interfaces for easy replacement and maintenance.

[0092] Through these detailed designs and reliable control systems, the stable operation of the cyclone separator and valve system is ensured, achieving efficient material separation and controllable discharge. At the same time, the maintenance convenience and operation reliability of the equipment are considered, greatly extending the service life of the equipment.

[0093] The bag dust removal bin 40 is vertically arranged below the cyclone separator 30 and is connected by a flange seal. The bag dust removal bin 40 includes a cylindrical bin body and a dust removal bin door 41 arranged on the bin body. A bag filter assembly is vertically hung in the bag dust removal bin 40 for collecting dust. The top of the bag dust removal bin 40 is connected with an induced draft fan 50 for forming a negative pressure air flow.

[0094] The bottom of the bag dust removal bin 40 is provided with a conical material guide part designed with a 45-degree taper angle to ensure smooth flow of the material. The conical material guide part is connected with the bottom end of the cylindrical bin body by a flange seal, and the bottom discharge port is provided with an electric discharge valve. The bag filter assembly is hung on the top of the cylindrical bin body by a fixing frame, and the filter assembly includes a plurality of side-by-side arranged bags and a pulse blowing device for dust removal.

[0095] The cooling system 60 includes a cold air duct arranged outside the induced draft fan 50 and a cold air fan connected with the duct. The cold air duct is connected with the inside of the dust removal bin 40 and the crushing chamber 20 by a sealing joint for introducing cold air into the dust removal bin 40 and the crushing chamber 20. The temperature control device 70 includes a temperature sensor installed on the inner wall of the crushing chamber 20, an electric control box arranged outside the crushing chamber 20, and a control relay. When the temperature sensor detects that the temperature in the crushing chamber 20 exceeds the preset value, the control relay starts the cold air fan, and at the same time controls the grading motor 21 to stop working until the temperature drops to the safe range.

[0096] In one embodiment, 4-6 cold air ducts are evenly arranged on the outer wall of the crushing chamber 20 in the circumferential direction, each duct is made of 304 stainless steel with a diameter of 80-100 mm. These ducts are spirally wound on the outer wall of the crushing chamber, and the uniform spacing between the ducts is 200-300 mm, forming a large cooling contact area to ensure the uniformity of the cooling effect. The cold air duct is connected with the inside of the crushing chamber 20 by a flange seal joint, and a high-temperature-resistant fluorine rubber sealing ring is used at the joint, with a temperature range of -40℃ to 200℃. To prevent the joint from loosening, a special bolt locking mechanism is designed, and a welded reinforcing rib plate is added at the joint with the crushing chamber.

[0097] The cooling system 60 is equipped with a high-power centrifugal cold air fan with an air volume of not less than 2000m 3 / h. An air filter is installed at the inlet of the fan to effectively block impurities in the air from entering the system. The outlet of the fan is equipped with an electric regulating valve which can automatically adjust the air supply according to the real-time temperature in the crushing chamber. In order to reduce the vibration of the equipment during operation, the fan is installed on a specially designed vibration reduction support.

[0098] The temperature monitoring system is evenly distributed with 3-4 PT100 temperature sensors along the circumference of the inner wall of the crushing chamber. The sensors have a 316L stainless steel housing, providing strong wear resistance. These sensors have a measurement accuracy of not more than ±0.5℃, a response time of less than 3 seconds, and use a 4-20mA standard current signal for data transmission, ensuring the accuracy and real-time nature of temperature monitoring.

[0099] The electric control box adopts an IP65 protection level sealing structure, with a temperature display instrument installed inside, which can display the working temperature in real time and record the temperature change curve. At the same time, it is equipped with an audible and visual alarm device, which will send an alarm when the temperature is abnormal. The electric control box is provided with a manual / automatic control switch, which is convenient for operators to choose the control mode according to actual needs.

[0100] The entire temperature control system uses an intelligent PLC controller, which sets a complete temperature control logic: when the detected temperature reaches 60℃, the system automatically starts the cooling fan; when the temperature continues to rise to 65℃, the step motor 21 enters a speed reduction state; if the temperature still rises to 70℃, the system will automatically stop the operation of the step motor 21; when the temperature drops below 45℃, the cooling fan automatically stops working. The system also has a temperature delay protection function to avoid frequent start and stop of the equipment, and has fault self-diagnosis and operation data recording functions.

[0101] To ensure the safe and reliable operation of the system, a complete protection measure is set, including temperature overrun interlocking protection function, cooling fan working state real-time feedback, and UPS uninterruptible power supply. The system also automatically performs regular sensor calibration detection to ensure the accuracy of measurement data.

[0102] In terms of maintenance convenience, the temperature sensor adopts a detachable installation structure, which is convenient for replacement and maintenance. The cooling pipe is provided with a drain valve to prevent condensate water from accumulating in the pipe. Maintenance openings are reserved at key positions, and state monitoring ports are set to support remote diagnosis and maintenance. These designs ensure that daily maintenance and fault elimination of the equipment can be conveniently carried out.

[0103] Through the fine design of the above temperature control system, the temperature problem in the grinding process is effectively solved, ensuring the stability of the process and the reliability of the product quality. The system has high automation degree, simple operation, and convenient maintenance, which can meet the needs of modern production.

[0104] The grinding equipment of the embodiment of the present application further comprises a mixing and stirring device (not shown in the figure). The mixing and stirring device comprises a sealed stirring bin connected with the discharge end of the bag dust removal bin 40 through a flange. A central stirring shaft is horizontally arranged in the sealed stirring bin, and helical stirring blades are uniformly fixed on the stirring shaft in the axial direction. A feeding port and a sealing cover are arranged on the top of the sealed stirring bin for the addition of additives. A conical material guiding structure and an electric discharge valve are arranged at the bottom of the sealed stirring bin. In addition, a dust collecting device comprising a dust collecting hood, a dust suction pipeline, a dust removal fan and a secondary bag dust remover is further arranged on the top of the sealed stirring bin for collecting dust generated in the stirring process.

[0105] Exemplarily, the sealed stirring bin of the mixing and stirring device adopts a horizontal cylindrical structure, the main body is made of SUS304 stainless steel, the cylinder diameter is 1500 mm, the length is 3000 mm, and the wall thickness is 8 mm. The inner surface of the cylinder is mirror polished, and the surface roughness Ra is ≤0.4 μm to avoid material adhesion. The stirring bin is connected with the bag dust removal bin 40 through a DN300 standard flange, and a food-grade fluorine rubber sealing ring is used between the flanges to ensure the air tightness of the connection.

[0106] The central stirring shaft adopts a Φ120 mm stainless steel hollow shaft supported by heavy-duty double-row self-aligning roller bearings at both ends. The bearing seat adopts a split structure and is equipped with a labyrinth seal device and an automatic grease injection system. The stirring shaft is driven by a 15 kW variable frequency motor, and the speed adjustable range of 20-60 rpm is realized through a gear reducer. An elastic coupling is used between the motor and the speed reducer to reduce vibration transmission.

[0107] The helical stirring blades adopt an integral structure design, the blade thickness is 6 mm, the outer diameter is 1200 mm, and the pitch is 600 mm. The surface of the blade is treated by plasma spraying to improve wear resistance. A set of double helical blades is installed every 300 mm along the stirring shaft, the helical directions of adjacent blades are opposite, and an opposite stirring effect is formed. The gap between the blade and the cylinder wall is adjustable, and is usually set to 15-20 mm. In order to enhance the mixing effect, a plurality of inclined tines are designed on the helical blades to improve the axial conveying capacity of the material.

[0108] Three DN200 feeding ports are arranged on the top of the sealed stirring bin, and each feeding port is equipped with a pneumatic butterfly valve and a quick-opening sealing cover. The sealing cover adopts a hinge structure and is equipped with a hand wheel quick locking device and a limit switch. A material level sensor is arranged at the feeding port for monitoring the material loading amount. In addition, an LED explosion-proof lighting lamp and an observation window are installed on the top to facilitate the operator to observe the stirring state.

[0109] The conical material guiding structure is located at the bottom of the stirring bin, adopts a 45-degree conical angle design, and the inner surface is subjected to special polishing treatment. The material guiding section is provided with an electric heating device and a heat preservation layer to prevent material from dewing. A DN250 electric butterfly valve is installed at the bottom as a discharge valve, the valve body is driven by a pneumatic cylinder, and the opening and closing time is less than 3 seconds. A weighing hopper is arranged below the discharge valve, equipped with a high-precision weighing sensor, to realize quantitative discharge.

[0110] The core component of the dust collection system is the dust collection cover, which adopts a fully enclosed design and covers all the material inlet areas. The dust collection cover is made of 2mm thick stainless steel plate, and the bottom is provided with an adjustable air suction port. The dust suction pipeline adopts Φ200mm spiral duct with smooth inner wall to reduce resistance loss. The pipeline system is provided with multiple observation ports and cleaning ports for daily maintenance.

[0111] The dust removal fan selects a 7.5kW high-pressure centrifugal fan with a wind volume of 4000m 3 / h and a full pressure of 15000Pa. The fan is controlled by frequency conversion, which can automatically adjust the air volume according to the working condition. The fan inlet and outlet are provided with flexible connections to reduce vibration transmission. The secondary bag-type dust collector adopts pulse back-blowing type dust removal method, and the filter bag selects PTFE membrane filter material with a filtration accuracy of 1μm and a filtration area of 80m 2 .

[0112] The pipeline system of the dust collection device includes multiple dust suction branch pipes and a dust removal main pipe. The dust suction branch pipes adopt circular pipes with a diameter of 100mm, which are connected with the dust collection covers at different positions on the top of the sealed stirring bin for collecting dust generated nearby. These dust suction branch pipes are connected to the dust removal main pipe with a diameter of 200mm through a tee joint. The dust removal main pipe is provided with a butterfly valve for adjusting the air volume, and the tail end is connected with the dust removal fan. This segmented pipeline design ensures the uniformity and efficiency of dust collection.

[0113] The bin body of the sealed stirring bin is composed of a top plate, a side plate and a bottom plate to form a whole sealing structure. The side plate of the bin body is made of 8mm thick steel plate, and the inner surface is subjected to polishing treatment to prevent material adhesion. The four corners of the side plate are provided with reinforcing rib plates to improve the structural strength. The side plate is sealingly connected with the top plate and the bottom plate through flanges, and wear-resistant sealing rings are arranged between the flanges to ensure that no dust leakage occurs during stirring. An observation window and a maintenance door are also arranged on the side plate for monitoring the stirring state and equipment maintenance.

[0114] In order to solve the problem of material conveying blockage, the lifting machine feeding mode is adopted instead of the traditional screw feeding. The lifting machine includes a fixed support and a lifting mechanism arranged on the support, and a plurality of hoppers are uniformly fixed on the conveying belt of the lifting mechanism. An inclined material guiding groove is arranged at the top of the lifting machine, the discharge end of the material guiding groove is communicated with a lower hopper, and the lower hopper is connected with the feeding hopper 11 to form a complete feeding channel.

[0115] The discharging system of the elevator is composed of an inclined guide chute and a discharging hopper. The discharging hopper has a conical structure, and the upper part is sealingly connected to the discharge end of the inclined guide chute through a flange, and the lower part is connected to the feeding hopper 11 through a flexible joint. The flexible joint is made of wear-resistant rubber material, which can buffer vibration and compensate for installation errors. A transparent observation window is also provided on the side wall of the discharging hopper to facilitate the operator to observe the discharging condition of the material. In addition, a radio frequency material level meter is also installed on the inner wall of the discharging hopper for monitoring the material accumulation condition.

[0116] The above-mentioned improved structure design further improves the working reliability and maintenance convenience of the equipment. The use of the flexible joint effectively avoids vibration transmission, and the setting of the radio frequency material level meter provides a more accurate material control means.

[0117] The working process of the grinding equipment of the present application is as follows: first, the material is conveyed to the feeding hopper 11 through the hopper of the elevator, and is quantitatively fed into the crushing chamber 20 under the control of the material level sensor. After being crushed by the crushing hammer in the crushing chamber 20, the material is classified by the classification impeller. The qualified fine powder enters the cyclone separator 30 with the airflow, while the unqualified material returns to the crushing chamber 20 for further crushing under the guidance of the guide ring. The separated fine powder is collected by the bag dust collection bin 40 and then enters the sealed mixing bin for mixing with the additives. During the whole process, the temperature control device 70 monitors the temperature of the crushing chamber 20 in real time, and adjusts the temperature by controlling the start and stop of the cooling fan to ensure the grinding quality of the material.

[0118] Figure 3 Among them, the trace additive system is an important part of the grinding equipment, mainly used for accurately adding the required additives during the mixing stage after the material grinding is completed. The system is connected to the three DN200 feeding ports at the top of the sealed mixing bin, and through the accurate metering and conveying device, it ensures that the additives can be uniformly added to the ground material according to the preset proportion.

[0119] This rear-mounted addition scheme solves the key problem in traditional grinding equipment: if the additives are added before grinding, due to the difference in specific gravity between the material and the additives, the additives are easily sucked into the dust collector by the negative pressure airflow of the system, not only causing the waste of additives, but also affecting the uniformity of the final product. By placing the addition of additives in the mixing stage after grinding is completed, and using a sealed mixing bin for mixing, the loss of additives is avoided, and the material and additives are fully mixed.

[0120] The synergistic working process of the trace addition system and the grinding equipment is as follows: after the material is crushed in the crushing chamber, separated by the cyclone separator and collected in the bag dust collection bin, the material enters the sealed stirring bin, at this time the trace addition system starts to work, the measured additive is accurately put into the stirring bin through the feeding port, and then the additive is fully mixed by the spiral stirring blade in the stirring bin. The whole adding process is carried out in a sealed environment, and the dust collection device at the top is matched, so that the dust pollution problem is effectively avoided. This design not only improves the utilization efficiency of the additive, but also ensures the quality stability of the product.

[0121] In summary, by reasonably designing the structure and positional relationship of each component, equipping with a temperature control system and a sealed mixing device, the problems of excessive temperature, dust pollution and material conveying blockage in the grinding process are effectively solved, and the working efficiency and product quality of the equipment are improved.

Claims

1. A grinding apparatus characterized by comprising: The utility model relates to a kind of powder grinding machine, including: Feeding mechanism, including feeding motor and the feeding hopper with the driving connection of the feeding motor, the feeding hopper is vertically arranged; Pulverizing chamber, it is arranged below the feeding hopper and is communicated with it, the pulverizing chamber is sealed cavity structure; Classification device, including classification motor arranged at the top of the pulverizing chamber and classification impeller coaxially connected with the classification motor; Cyclone separator, it is arranged in the side of the pulverizing chamber and is communicated with it; Cooling system, including cold air duct arranged in the outer wall of the pulverizing chamber, the cold air duct is communicated with the inside of the pulverizing chamber, and the cold air duct is connected with cold air fan; And Temperature control device, it is arranged in the inner wall of the pulverizing chamber and is electrically connected with the cold air fan, for detecting the temperature in the pulverizing chamber; Also including: Bag dust collection bin, vertically arranged below the cyclone separator and sealedly connected with the discharge end of it; Air lock fan, it is arranged at the connection of the cyclone separator and the bag dust collection bin;And Induced draft fan, it is arranged at the top of the bag dust collection bin and is communicated with it, for forming negative pressure suction airflow; Also including mixing and stirring device, the mixing and stirring device includes: Sealed stirring bin, it is connected with the discharge end of the bag dust collection bin by flange; Center stirring shaft, it is horizontally rotatably arranged in the sealed stirring bin;And Spiral stirring blade, it is uniformly arranged along the axial direction of the stirring shaft.

2. The lapping apparatus of claim 1, wherein, The bag dust collection bin includes: Cylindrical bin body; Openable and closable dust collection bin door, it is hinged on the bin body; Bag filter assembly, it is vertically hung in the bin body;And Conical material guide part, it is arranged at the bottom of the bin body.

3. The lapping apparatus of claim 1, wherein, The pulverizing chamber is also provided with: Annular guide ring, it is fixedly arranged directly below the classification impeller, for guiding material to the inner wall of the pulverizing chamber; Wear-resistant lining plate, it is fixedly installed on the inner wall of the pulverizing chamber;And Multiple pulverizing hammer heads uniformly distributed in circumferential direction, it is detachably installed on the rotor in the pulverizing chamber.

4. The lapping apparatus of claim 1, wherein, The temperature control device includes: Temperature sensor, it is arranged in the inner wall of the pulverizing chamber; Electric control box, it is fixedly arranged outside the pulverizing chamber and is signal-connected with the temperature sensor;And Control relay, it is arranged in the electric control box and is electrically connected with the cold air fan and the classification motor respectively.

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