Transmission shaft auxiliary cooling airtight device for sand mill

Abstract

The utility model relates to an auxiliary cooling airtight device for a transmission shaft of a sand mill, which comprises a rack, a mounting plate and a cavity welding part are mounted on the rack, an air blowing device is mounted on the mounting plate, a bearing seat welding part is coaxially mounted on the cavity welding part, and an air path of the air blowing device is used for communicating airflow to an L-shaped air joint. A second sealing cover is installed above a second O-shaped ring on the upper end face of the bearing seat welding part, the second sealing cover and the first sealing cover are assembled to form an exhaust gap, through holes of the first sealing cover, the second sealing cover and the bearing seat are communicated with each other to form an air channel, and a gap between the bearing seat welding part and the hollow shaft forms an inner air channel. Airflow entering from the air passage enters the inner air passage through the air guide hole of the baffle; according to the utility model, the phenomenon that the grinder has to be shut down for work due to over-high temperature caused by poor heat dissipation of a transmission system of the grinder is solved, and reliable guarantee is provided for efficient operation of the grinder, prolonging of the service life and reduction of equipment faults.

Description

[Technical field]

[0001] The utility model relates to the technical field of mechanical graded grinding equipment, in particular to an auxiliary cooling and airtight device for a transmission shaft of a sand mill. [Background Technology]

[0002] Mechanical classifying mill is one of the most commonly used and effective grinding equipment. It uses high-speed rotating grinding disc to drive the grinding medium to move at high speed, and uses the friction, extrusion and collision between the media and the grinding ring to disperse the agglomerated materials, and then uses the high-speed rotating classifying wheel to screen the media. The grinder not only has the function of dispersing materials, but also has the function of efficient ultra-fine grinding. It is widely used in the grinding and dispersion of products in the food and chemical industry such as mineral processing, pigments, nano applications, cosmetics, papermaking, food, insulation materials, magnetic materials, etc.

[0003] Although many existing grading mills can grind and process high-quality products efficiently, the speed of the mill is very high when processing materials. The working speed can even reach about 3600 rpm. The ultra-high speed inevitably generates considerable heat, and the transmission system is limited by its own structure, and the heat dissipation is not good. After a long period of operation, its temperature will rise to the extent that it affects the normal operation of the equipment and has an adverse effect on the quality of the ground medium. The equipment has to be shut down and wait for the temperature of the transmission system to drop before it can be restarted for production and processing. Frequent shutdowns and waiting for work seriously affect the continuous production capacity of the grinder, and the transmission system often runs at a higher temperature, which not only affects the working life of related parts and components, but also increases the operating failures of the equipment accordingly, not only affecting the normal production of the enterprise, but also affecting the service life of related parts and components of the grinder, thereby inevitably increasing various maintenance expenses.

[0004] If a device can be provided to assist the transmission system in dissipating heat and cooling the temperature, the temperature of the transmission system can be controlled within an appropriate range, and the long-term high-intensity operation capability of the grinder can be enhanced, it will have very important practical significance and application value. The grinder with an airtight device for auxiliary cooling of the transmission shaft is developed to solve the problem that the transmission system of the grinder on the current market is prone to overheating. [Contents of the utility model]

[0005] The purpose of the utility model is to solve the above-mentioned deficiencies and provide a transmission shaft auxiliary cooling airtight device for a sand mill, which solves the problem that the grinding machine transmission system has poor heat dissipation, resulting in the grinding machine often having to stop working due to excessive temperature. It provides reliable guarantee for the grinding machine to operate efficiently for a long time with high intensity, prolong the working life of related components and reduce equipment failures, thereby prolonging the service life of the equipment, reducing the cost of use and maintenance, satisfying customers' maximum utilization of the grinding machine production capacity to improve production capacity, reducing the comprehensive use cost of the equipment, and maximizing economic benefits.

[0006] In order to achieve the above purpose, an auxiliary cooling and airtight device for the transmission shaft of a sand mill is designed, comprising a frame 1, a mounting plate 2 and a cavity welding part 3 are installed on the frame 1, a blowing device is installed on the mounting plate 2, a bearing seat welding part 3 is coaxially installed on the cavity welding part 3, an air path 4 of the blowing device connects the airflow to an L-shaped air joint 13, the L-shaped air joint 13 is installed at the air inlet on the bearing seat welding 31, an O-ring 28 is disposed in the groove on the upper end surface of the bearing seat welding 31, a sealing cover 27 is fixedly installed above the O-ring 28, a sealing cover 1 26 is installed above the sealing cover 27, and the The joint surface of the sealing cover 1 26 and the sealing cover 27 forms an exhaust gap after assembly and fixation. The sealing cover 1 26, the sealing cover 27 and the bearing seat welding 31 are all provided with through holes, and after assembly, the through holes of the three are interconnected to form an air duct 17 leading to the sand mill transmission system. The gap between the bearing seat welding 31 and the hollow shaft 25 forms an internal air duct 41. A solid shaft 23 is installed inside the hollow shaft 25. A baffle 20 is installed between the uppermost inner step of the sealing cover 27 and the hollow shaft 25. The baffle 20 is evenly distributed with air guide holes 42. The airflow entering from the air duct 17 enters the internal air duct 41 through the air guide holes 42.

[0007] Furthermore, the blowing device includes an air circuit 4, a hose connector 5, a pipe clamp 6, a solenoid valve 7, a pressure reducing filter valve 8, a ball valve 9 and a T-type quick air connector 12. The air circuit 4 is fixed to the mounting plate 2 through the pipe clamp 6. The hose connector 5 is arranged at the left end of the air circuit 4 and connected to an external air source. The hose connector 5, the solenoid valve 7, the pressure reducing filter valve 8 and the ball valve 9 are sequentially connected to the air circuit 4. The right end of the air circuit 4 is divided into two paths through the T-type quick air connector 12, one of which is connected to the L-type air connector 13, and the other is connected to the pressure gauge 10 and the pressure sensor 11. The pressure gauge 10 and the pressure sensor 11 are used to monitor the air circuit pressure in real time.

[0008] Furthermore, a sealing gasket 15 is placed above the central opening position of the frame 1, the cavity weld 3 is placed on the sealing gasket 15 and is fixedly installed on the frame 1 by bolts 14, a sealing gasket 2 16 is provided at the inner central position of the cavity weld 3, the bearing seat weld 31 is placed in the cavity weld 3, the flange mounting surface of the bearing seat weld 31 is placed on the sealing gasket 2 16, and is fixedly installed on the cavity weld 3 by hexagonal bolts 33.

[0009] Furthermore, a threaded hole is provided on the upper part of the bearing seat welding 31 corresponding to the position of bearing one 18 and bearing two 19, and a reducing inner and outer thread joint 29 is installed in the threaded hole. A PT100 thermal resistor 30 is installed on the reducing inner and outer thread joint 29, and the PT100 thermal resistor 30 is used to detect and collect temperature information here in real time.

[0010] Furthermore, an O-ring three 40 is installed in the groove of the lower end surface of the bearing seat welding 31, and a lower bearing cover 36 is fixedly installed on the lower end surface of the bearing seat welding 31. The lower bearing cover 36 presses the O-ring three 40, and the steps inside the lower bearing cover 36 are successively installed with bearing four 35, gasket 34, star disc spring 32, bearing one 18 and bearing two 19 from bottom to top. A hollow shaft 25 is installed on the inner side of the holes of the bearing four 35, gasket 34, star disc spring 32, bearing one 18 and bearing two 19, and an O-ring one 24 is installed in the groove of the upper end surface of the hollow shaft 25. An upper bearing cover 21 is installed on the upper part of the O-ring one 24, and the upper bearing cover 21 is used to seal the upper end surface of the entire sand mill transmission system.

[0011] Furthermore, bearing three 22 and bearing five 37 are respectively installed at the steps at the upper and lower ends of the solid shaft 23. The top of the lower part of the solid shaft 23 is fixed by a fixing washer 39 and an M8 bolt 38. The solid shaft 23 and bearing five 37 are pressed against the hollow shaft 25 by the fixing washer 39 and the M8 bolt 38.

[0012] Furthermore, the airflow entering from the airway 17 reaches the annular structure inside the sealing cover 26 along the airway 17, and the airflow flows in a ring shape and is divided into two parts, one part of the airflow directly flows to the gap between the sealing cover 27 and the sealing cover 26, and the upper bearing cover 21 is installed above the sealing cover 26, and the other part of the airflow is guided to the top of the baffle 20 through the gap formed by the sealing cover 27, the sealing cover 26 and the upper bearing cover 21, and enters the inner airway 41 through the air guide hole 42 on the baffle 20 to form a flowing airflow, and the flowing airflow cools down the inside of the sand mill transmission system.

[0013] Compared with the prior art, the utility model constructs an air passage leading to the transmission system by installing several parts and sealing gaskets with air guide holes, and the external cooling gas can directly reach the core heat-generating components inside the transmission system. In order to allow the cooling gas to flow efficiently and take away the heat, an air outlet gap formed by assembling two sealing covers is designed on the upper part of the transmission shaft system, so that the airflow can be efficiently discharged to form an air curtain while avoiding the interference of the airflow on the grinding chamber, so that efficient gas cooling and cooling inside the transmission shaft can be achieved. At the same time, in order to more reliably and stably control the airflow entering the transmission shaft, the air pressure inside the transmission shaft is always maintained to be greater than the pressure in the grinding chamber, and the air curtain at the exhaust gap is kept stable and reliable, completely preventing dust from entering the interior through the gap; the device is equipped with a set of gas control systems composed of many control elements such as solenoid valves, pressure reducing filter valves and pressure sensors. The system is simple and clear in setting, and has functions such as autonomous regulation, on-off and pressure relief protection. Combined with the PT100 thermal resistor installed on the bearing seat weldment that can detect and collect the temperature of the core position inside the transmission shaft in real time, the gas flow and pressure entering the transmission shaft are perfectly controlled. The force effectively takes away the heat generated inside the transmission shaft, and prevents external dust from entering the transmission shaft through the gap, thus achieving a sealing effect on the transmission shaft. Through the above improvements, the mechanical grading mill can realize high-efficiency and high-quality processing of materials at full power for a long time, and there is no need to stop the equipment for cooling and resting. The equipment capacity per unit time is greatly increased, and less processing equipment can be purchased under the condition of unchanged total output. The introduced stable high-pressure gas forms a perfect air curtain, and the air tightness is reliable and effective to prevent dust from entering the transmission shaft, maintaining the clean working environment of the transmission system, so that the transmission shaft has a very long service life and a very low failure rate. In addition, this system directly introduces the cooling airflow into the core position of the transmission system, with obvious cooling and temperature control effects, and the equipment can achieve long-term full-power processing. The excellent airtight effect ensures that the inside of the transmission shaft is not polluted by dust, the operation of the equipment is more stable and reliable, the failure rate is low, and the service life of each component is longer. Compared with the grinder without the gap sealing system between the grading wheel and the end cover, the comprehensive use and maintenance cost is lower, and the output and quality of the processed materials can be greatly improved, meeting the needs of customers for cost saving and efficiency improvement.

[0014] In summary, the utility model solves the problem that the traditional grinder transmission system has poor heat dissipation, which causes the grinder to often have to stop and wait for work due to excessive temperature. It provides reliable guarantee for the grinder to operate efficiently for a long time with high intensity, prolongs the working life of related components and reduces equipment failures, thereby extending the service life of the equipment and reducing the cost of use and maintenance, satisfying the customer's desire to maximize the use of the grinder's production capacity to increase production capacity, reduce the comprehensive use cost of the equipment, and maximize economic benefits. [Drawings]

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a structural schematic diagram of the external airflow control device of the utility model;

[0017] Figure 3 This is a schematic diagram of the installation and fixation of the transmission system of the utility model;

[0018] Figure 4 It is a schematic diagram of the transmission system structure of the utility model;

[0019] Figure 5 It is a partial enlarged schematic diagram of the gas circuit of the transmission system of the utility model;

[0020] Figure 6 It is a front structural schematic diagram of the baffle of the utility model;

[0021] Figure 7 It is a schematic diagram of the internal structure of the baffle of the utility model;

[0022] In the figure: 1, frame; 2, mounting plate; 3, cavity welding parts; 4, gas path; 5, hose connector; 6, pipe clamp; 7, solenoid valve; 8, pressure reducing filter valve; 9, ball valve; 10, pressure gauge; 11, pressure sensor; 12, T-type quick gas connector; 13, L-type gas connector; 14, bolt; 15, gasket 1; 16, gasket 2; 17, gasket; 18, bearing 1; 19, bearing 2; 20, baffle; 21, upper bearing cover; 22, bearing 3; 2 3. Solid shaft; 24. O-ring one; 25. Hollow shaft; 26. Sealing cover one; 27. Sealing cover two; 28. O-ring two; 29. ​​Different diameter internal and external thread joints; 30. PT100 thermal resistor; 31. Bearing seat welding; 32. Star disc spring; 33. Hexagonal bolt; 34. Washer; 35. Bearing four; 36. Lower bearing cover; 37. Bearing five; 38. M8 bolt; 39. Fixed washer; 40. O-ring three; 41. Internal air duct; 42. Air guide hole. [Specific implementation method]

[0023] The utility model provides a transmission shaft auxiliary cooling airtight device for a sand mill, comprising a frame 1, a mounting plate 2 and a cavity welding piece 3 are mounted on the frame 1, a blowing device is mounted on the mounting plate 2, a bearing seat welding piece 31 is coaxially mounted on the cavity welding piece 3, an air path 4 of the blowing device connects the air flow to an L-shaped air joint 13, the L-shaped air joint 13 is mounted on the air inlet on the bearing seat welding piece 31, an O-ring 28 is disposed in a groove on the upper end surface of the bearing seat welding piece 31, a sealing cover 27 is fixedly mounted above the O-ring 28, a sealing cover 1 26 is mounted above the sealing cover 27, and a sealing cover 1 The joint surface of 26 and the sealing cover 27 forms an exhaust gap after assembly and fixation. The sealing cover 1 26, the sealing cover 27 and the bearing seat welding 31 are all provided with through holes, and after assembly, the through holes of the three are interconnected to form an airway 17 leading to the sand mill transmission system. The gap between the bearing seat welding 31 and the hollow shaft 25 forms an inner airway 41, and a solid shaft 23 is installed inside the hollow shaft 25. A baffle 20 is installed between the uppermost inner step of the sealing cover 27 and the hollow shaft 25, and air guide holes 42 are evenly distributed on the baffle 20. The airflow entering from the airway 17 enters the inner airway 41 through the air guide holes 42.

[0024] Among them, the blowing device includes an air circuit 4, a hose connector 5, a pipe clamp 6, a solenoid valve 7, a pressure reducing filter valve 8, a ball valve 9 and a T-type quick air connector 12. The air circuit 4 is fixed to the mounting plate 2 through the pipe clamp 6. The hose connector 5 is arranged at the left end of the air circuit 4 and connected to an external air source. The hose connector 5, the solenoid valve 7, the pressure reducing filter valve 8 and the ball valve 9 are sequentially connected to the air circuit 4. The right end of the air circuit 4 is divided into two paths through the T-type quick air connector 12, one of which is connected to the L-type air connector 13, and the other is connected to the pressure gauge 10 and the pressure sensor 11. The pressure gauge 10 and the pressure sensor 11 are used to monitor the air circuit pressure in real time.

[0025] The airflow entering from the airway 17 reaches the annular structure inside the sealing cover 26 along the airway 17, and the airflow flows in an annular shape and is divided into two parts, one part of the airflow directly flows to the gap between the sealing cover 27 and the sealing cover 26, and the upper bearing cover 21 is installed above the sealing cover 26, and the other part of the airflow is guided to the top of the baffle 20 through the gap formed by the sealing cover 27, the sealing cover 26 and the upper bearing cover 21, and enters the inner airway 41 through the air guide hole 42 on the baffle 20 to form a flowing airflow, and the flowing airflow cools down the inside of the sand mill transmission system.

[0026] The utility model adds a set of stable, efficient and self-adjusting air blowing devices to the equipment and redesigns some spare parts in the transmission system, so that the transmission system has an air passage directly reaching the internal core from the outside. After the external air blowing device is connected, the high-pressure airflow can directly enter the internal core of the transmission system through the air passage. At the same time, in order to allow the airflow to flow better and take away more heat, a special exhaust gap is designed at a suitable position on the upper part of the transmission system. The exhaust position of this gap avoids the grinding chamber of the grinder and is selected in the screening chamber where the grading wheel is located. In this way, the exhausted airflow can be prevented from interfering with the environment in the grinding chamber, thereby affecting the grinding processing effect of the grinder. The high-speed airflow is continuously discharged from the gap, forming an excellent air curtain sealing effect. Through the above designs and modifications, the heat dissipation conditions of the transmission system of the grinder are greatly improved. Even under high-intensity working conditions, the temperature of the transmission system can be controlled within an appropriate range for a long time. The grinder is no longer troubled by shutdown due to excessively high transmission system temperature. More working time per unit time allows the output of the grinder to be significantly increased. The continuous air curtain provides a reliable sealing effect for the transmission system, and dust cannot enter the interior through the gaps. Good working conditions also result in fewer equipment failures, greatly reducing the investment in equipment maintenance, and achieving significant cost reduction and efficiency improvement effects.

[0027] Specifically, a mounting plate 2 is mounted on the frame 1, and all control components and pipelines of the blowing device are mounted on the mounting plate 2. The cavity welding part 3 is also mounted on the frame 1, and the transmission system body is mounted on the cavity welding part 3, and is connected and fixed to the frame 1 through the cavity welding part 3. From left to right, the airflow control system is a main air circuit of a hose connector 5, a solenoid valve 7, a pressure reducing filter valve 8, and a ball valve 9 connected in series in the air circuit 4, and is divided into two by a T-type quick air connector 12, one of which is directly connected to the L-type air connector 13, and the other is connected to the pressure gauge 10 and the pressure sensor 11. The L-shaped gas joint 13 is installed at the air inlet on the bearing seat welding 31. A sealing gasket 2 16 is padded under the flange mounting surface of the bearing seat welding 31 and fixedly installed on the cavity welding part 3 with a hexagonal bolt 33. The cavity welding part 3 is fixedly installed on the frame 1 by bolts 14. The upper end surface of the bearing seat welding 31 is successively installed with a sealing cover 27, and an O-ring 28 is also installed between the bearing seat welding 31 and the sealing cover 27. A sealing cover 1 26 is installed above the sealing cover 27. After assembly, the sealing cover 1 26 and the sealing cover 27 will form a gap for exhausting gas. The above three parts of the bearing seat welding 31, the sealing cover 27 and the sealing cover 1 26 all have through holes. After assembly together, all the through holes are interconnected to construct an airflow channel from the outside to the core of the transmission system, which is the airway 17. The assembly gap between the bearing seat welding 31 and the hollow shaft 25 forms an inner airway 41. The inner side of the uppermost step of the sealing cover 27 and The baffle 20 is installed between the outer sides of the hollow shaft 25, the upper bearing cover 21 is installed above the sealing cover 26, and the O-ring 24 is installed below the upper bearing cover 21 to cooperate with the hollow shaft 25 to close the upper end face of the transmission system. The bottom of the bearing seat welding 31 is equipped with an O-ring 3 40 and a lower bearing cover 36 to close the lower end face of the transmission system. The innermost part of the transmission system is the solid shaft 23, and the upper and lower ends of the solid shaft 23 are bearing 3 22 and bearing 5 37 respectively. The fixing washer is fixed on the solid shaft 23 by the M8 bolt 38, and the solid shaft 23 and the bearing 5 37 are pressed against the hollow shaft 25. The outer edges of the bearing 3 22 and the bearing 5 37 are the hollow shaft 25. The hollow shaft 25 and the bearing seat welding 31 are equipped with the bearing 4 35, the washer 34, the star disc spring 32, the bearing 1 18 and the bearing 2 19 from bottom to top. A certain amount of gap is reserved through a special structural design to facilitate air circulation. The bearing seat welding 31 has a threaded hole for installing the temperature sensor on the outside of the two most heat-generating parts, the bearing 1 18 and the bearing 2 19. The different-diameter internal and external thread joint 29 is installed therein, and the PT100 thermal resistor 30 is installed on the different-diameter internal and external thread joint 29.

[0028] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0029] As attached Figure 1As shown, the cavity welding part 3 is fixedly installed in the central position of the frame 1, and the bearing seat welding part 31 is coaxially installed on the cavity welding part 3 (see the attached Figure 3 ), the mounting plate 2 is mounted on the frame 1, and the related parts of the blowing device are arranged and installed on the mounting plate 2. The air path 4 connects the airflow to the L-shaped air connector 13 and guides the airflow into the transmission system. The above is a general layout of the entire device.

[0030] As attached Figure 2 As shown, the gas circuit 4 is fixed on the mounting plate 2 by two pipe clamps 6, and the hose connector 5 is arranged at the leftmost end of the gas circuit 4, which is the first part connected to the external gas source. The blowing device is arranged and installed from left to right. The hose connector 5, the pipe clamp 6, the solenoid valve 7, the pressure reducing filter valve 8, the pipe clamp 6, and the ball valve 9 are the related components for fixing the gas circuit to control the gas flow size and on-off. The component arranged further to the right of the gas circuit 4 is the T-type quick gas connector 12, which divides the gas circuit 4 into two paths, one of which is directly connected to the L-type gas connector 13, and the other is connected to the pressure gauge 10 and the pressure sensor 11. The above two components play the role of real-time monitoring of the gas circuit pressure. The above is the general layout of the blowing control system of the entire device.

[0031] As attached Figure 3 As shown, a sealing gasket 15 is placed above the central opening of the frame 1, and the cavity welding part 3 is placed on the sealing gasket 15. The bolts 14 firmly connect and fix the above three. The sealing gasket 2 16 is placed in the central position inside the cavity welding part. The bearing seat welding 31 is placed inside the cavity welding part 3, specifically the flange mounting surface of the bearing seat welding is placed on the sealing gasket 2 16, and then the above three are fixedly connected by the hexagonal bolts 33. The L-shaped gas joint 13 is connected to the threaded hole below the bearing seat welding 31, and this threaded hole is also the external interface of the airway. A threaded hole is set on the upper part of the bearing seat welding 31, roughly corresponding to the position of the bearing 1 18 and the bearing 2 19, and a reducing inner and outer thread joint 29 is installed therein. The PT100 thermal resistor 30 is installed on the reducing inner and outer thread joint 29. The PT100 thermal resistor 30 can detect and collect the temperature information here in real time, so that the system can use the collected relevant temperature information as a decision basis for increasing the gas flow or shutting down the protection equipment, etc. The above is the fixed installation method of the transmission system.

[0032] As attached Figure 4As shown, an O-ring 28 is placed in the groove of the upper end surface of the bearing seat welding 31, and the sealing cover 27 is installed and fixed on the top of the O-ring 28. The sealing cover 1 26 is installed on the top of the sealing cover 27. The joint surface of the sealing cover 1 26 and the sealing cover 27 forms an exhaust gap after assembly and fixation. The width of this gap can be fine-tuned within a certain range, and the sealing cover 1 26, the sealing cover 27 and the bearing seat welding 31 all have through holes. After assembly, the through holes of the above three are connected to form an airway 17. The baffle 20 is installed between the uppermost inner step of the sealing cover 27 and the hollow shaft 25. The baffle 20 is evenly distributed with air guide holes on the top, so that the airflow can circulate better, as shown in the attached figure. Figure 6 and attached Figure 7 As shown. O-ring three 40 is installed in the groove of the lower end surface of the bearing seat welding 31, the lower bearing cover 36 presses the O-ring three 40 and is fixed on the lower end surface of the bearing seat welding 31, the bearing four 35, the washer 34, the star disc spring 32, the bearing one 18 and the bearing two 19 are installed from bottom to top from the step inside the lower bearing cover 36 in sequence, the hollow shaft 25 is installed inside the holes of the above five components, the O-ring one 24 is installed in the groove of the upper end surface of the hollow shaft 25, the upper bearing cover 21 is installed on the upper part of the O-ring one 24, and the upper bearing cover 21 seals the upper end surface of the entire transmission system, the solid shaft 23 is installed inside the hollow shaft 25, and the steps at the upper and lower ends of the solid shaft 23 are respectively installed with the bearing three 22 and the bearing five 37, and finally the top of the lower part of the solid shaft 23 is fixed with a fixing washer 39 and an M8 bolt 38, which constitutes a transmission system component containing an air guide channel and an exhaust gap and integrating two sets of rotating devices.

[0033] As attached Figure 5 As shown in FIG. 1 , it is a partial enlarged schematic diagram of the air passage formed by the bearing seat welding 31, the sealing cover 27 and the sealing cover 1 26. When the gas enters the air passage 17 from the bottom, the airflow reaches the annular structure in the sealing cover 1 26 along the air passage 17. The airflow flows in an annular shape and is divided into two parts. Due to the different widths of the gaps, a small part of the airflow flows directly to the gap between the sealing cover 27 and the sealing cover 1 26, forming a stable and continuous air curtain to ensure that the transmission system has good air tightness to prevent dust from entering the interior. Most of the airflow passes through the larger gap formed by the sealing cover 27, the sealing cover 1 26 and the upper bearing cover 21 to guide the airflow to the top of the baffle 20. The baffle 20 has air guide holes (see attached for details). Figure 6 and attached Figure 7 ), the airflow enters the inner air channel 41 through the air guide hole, and the flowing airflow will cool down the relevant parts inside the transmission system.

[0034] This device introduces a large amount of high-pressure gas directly into the transmission system by adding a set of blowing devices that can accurately control the gas flow. The use of the airway and exhaust gap inside the transmission system allows the airflow to flow efficiently inside the transmission system and take away a large amount of heat. The temperature measuring device is used to adjust the relevant air supply and equipment operation status, and the temperature inside the transmission system is controlled within a temperature range that does not affect the efficient operation of the mechanical grading mill. The gas pressure at the exhaust gap is always maintained at a higher state than that in the external cavity through the control of the relevant system, so that a stable air curtain is formed outside the exhaust gap, so that the transmission system always maintains an excellent airtight state here, and dust cannot enter the transmission system through this gap, ensuring the cleanliness of the transmission system. The exhaust gap is designed at a higher position, avoiding the grinding chamber of the grinder, and choosing to let the airflow be discharged at the screening chamber of the grading wheel. In this way, the discharged airflow will not interfere with the grinding environment inside the grinding chamber, and will be directly discharged through the discharge port together with the material screened by the grading wheel, so it will not affect the grinding quality and grinding efficiency of the equipment, and the grinder can maintain a high-yield and high-quality working state for a long time.

[0035] Compared with the prior art, the sand mill with the gap sealing system between the grading wheel and the end cover can effectively take away a large amount of heat in the transmission shaft through the cooling airflow, and the temperature can be controlled within a reasonable range. The mechanical grading mill can process materials at full power for a long time without stopping the equipment for cooling. The single start-up time is increased by no less than 3 times; compared with the traditional grinder without the device installed, the comprehensive processing efficiency of the equipment is increased by about 35%; as the core component, the transmission system has good heat dissipation conditions to control the temperature, and the excellent air tightness ensures the internal cleanliness, and the related faults are reduced by more than 70%. The gap sealing system between the grading wheel and the end cover has a sophisticated structural design, reliable and durable components, a high degree of automation, precise temperature control, and reliable sealing effect. It improves the effective start-up rate of the equipment, reduces the procurement and comprehensive use costs of the equipment, provides strong support for customers to reduce costs and increase efficiency, and well meets the needs of customers for modern large-scale production.

[0036] The contents not described in detail in this manual belong to the prior art known to professional and technical personnel in the field. The standard parts used can be purchased from the market. The solenoid valve, pressure reducing filter valve and pressure sensor are also conventional products on the market and do not need to be customized. The specific connection methods of each part adopt mature conventional means such as bolts, rivets and welding in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0037] The present invention is not limited to the above-mentioned implementation modes, and any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be considered as equivalent replacement modes and shall be included in the protection scope of the present invention.

Claims

1. An auxiliary cooling and airtight device for a transmission shaft of a sand mill, comprising a frame (1), on which a mounting plate (2) and a cavity welding part (3) are mounted, characterized in that: The mounting plate (2) is provided with a blowing device, the cavity welding part (3) is coaxially provided with a bearing seat welding part (31), the air path (4) of the blowing device connects the air flow to the L-shaped air joint (13), the L-shaped air joint (13) is provided with an air inlet on the bearing seat welding part (31), an O-ring 2 (28) is disposed in a groove on the upper end surface of the bearing seat welding part (31), a sealing cover 2 (27) is fixedly installed above the O-ring 2 (28), a sealing cover 1 (26) is installed above the sealing cover 2 (27), and a joint surface between the sealing cover 1 (26) and the sealing cover 2 (27) forms an exhaust gap after being assembled and fixed. The sealing cover 1 (26), the sealing cover 2 (27) and the bearing seat weld (31) are all provided with through holes, and after assembly, the through holes of the three are interconnected to form an air passage (17) leading to the sand mill transmission system, the gap between the bearing seat weld (31) and the hollow shaft (25) forms an inner air passage (41), a solid shaft (23) is installed inside the hollow shaft (25), a baffle (20) is installed between the uppermost inner step of the sealing cover 2 (27) and the hollow shaft (25), and air guide holes (42) are evenly distributed on the baffle (20), and the airflow entering from the air passage (17) enters the inner air passage (41) through the air guide holes (42).

2. The auxiliary cooling and airtight device for the transmission shaft of a sand mill according to claim 1, characterized in that: The air blowing device comprises an air circuit (4), a hose connector (5), a pipe clamp (6), a solenoid valve (7), a pressure reducing filter valve (8), a ball valve (9) and a T-type quick air connector (12). The air circuit (4) is fixed to a mounting plate (2) through a pipe clamp (6). The hose connector (5) is arranged at the left end of the air circuit (4) and connected to an external air source. The hose connector (5), the solenoid valve (7), the pressure reducing filter valve (8) and the ball valve (9) are sequentially connected to the air circuit (4). The right end of the air circuit (4) is divided into two paths through a T-type quick air connector (12), one of which is connected to an L-type air connector (13) and the other is connected to a pressure gauge (10) and a pressure sensor (11). The pressure gauge (10) and the pressure sensor (11) are used to monitor the air circuit pressure in real time.

3. The auxiliary cooling and airtight device for the transmission shaft of a sand mill according to claim 1, characterized in that: A sealing gasket 1 (15) is placed above the central opening of the frame (1); the cavity welded part (3) is placed on the sealing gasket 1 (15) and is fixedly mounted on the frame (1) by bolts (14); a sealing gasket 2 (16) is provided at the central position inside the cavity welded part (3); the bearing seat weld (31) is placed in the cavity welded part (3); the flange mounting surface of the bearing seat weld (31) is placed on the sealing gasket 2 (16) and is fixedly mounted on the cavity welded part (3) by hexagonal bolts (33).

4. The auxiliary cooling and airtight device for the transmission shaft of a sand mill according to claim 1, characterized in that: The upper part of the bearing seat welding (31) is provided with threaded holes corresponding to the positions of the bearing one (18) and the bearing two (19), and the threaded holes are installed with different diameter internal and external thread joints (29), and the different diameter internal and external thread joints (29) are installed with PT100 thermal resistors (30), and the PT100 thermal resistors (30) are used to detect and collect temperature information therein in real time.

5. The auxiliary cooling and airtight device for the transmission shaft of a sand mill according to claim 1, characterized in that: An O-ring three (40) is installed in the groove of the lower end surface of the bearing seat welding (31), and a lower bearing cover (36) is fixedly installed on the lower end surface of the bearing seat welding (31). The lower bearing cover (36) presses the O-ring three (40). The step inside the lower bearing cover (36) is installed with bearing four (35), gasket (34), star disc spring (32), bearing one (18) and bearing two (19) in sequence from bottom to top. A hollow shaft (25) is installed on the inner side of the holes of the bearing four (35), gasket (34), star disc spring (32), bearing one (18) and bearing two (19). An O-ring one (24) is installed in the groove of the upper end surface of the hollow shaft (25). An upper bearing cover (21) is installed on the upper part of the O-ring one (24). The upper bearing cover (21) is used to seal the upper end surface of the entire sand mill transmission system.

6. The auxiliary cooling and airtight device for the transmission shaft of a sand mill according to claim 1, characterized in that: The steps at the upper and lower ends of the solid shaft (23) are respectively provided with a bearing three (22) and a bearing five (37); the top of the lower part of the solid shaft (23) is fixed by a fixing washer (39) and an M8 bolt (38); the solid shaft (23) and the bearing five (37) are pressed against the hollow shaft (25) by the fixing washer (39) and the M8 bolt (38).

7. The transmission shaft auxiliary cooling and airtight device for a sand mill according to any one of claims 1 to 6, characterized in that: The airflow entering from the air passage (17) reaches the annular structure inside the sealing cover (26) along the air passage (17), and the airflow flows in an annular shape and is divided into two parts, one part of the airflow directly flows to the gap between the sealing cover (27) and the sealing cover (26), and an upper bearing cover (21) is installed above the sealing cover (26), and the other part of the airflow is guided to the top of the baffle (20) through the gap formed by the sealing cover (27), the sealing cover (26) and the upper bearing cover (21), and enters the inner air passage (41) through the air guide hole (42) on the baffle (20) to form a flowing airflow, and the flowing airflow cools the inside of the sand mill transmission system.

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