Powder metallurgy mixer for oil bearing and use method of powder metallurgy mixer

Abstract

The invention belongs to the technical field of powder metallurgy mixing, and particularly relates to an oil bearing powder metallurgy mixer and a using method thereof.The oil bearing powder metallurgy mixer comprises a machine shell and a plurality of mixing cavities formed in the machine shell, stirrers are rotationally arranged in the mixing cavities correspondingly, and discharging pipes are fixedly arranged at the bottoms of the mixing cavities correspondingly; and an electric gate valve is arranged on the pipe wall of the discharge pipe. Through linkage of the grade screening mechanism and the mixing strength self-adjusting driving mechanism, precise screening and mixing of oil bearing powder are achieved, and the performance of oil bearing products is improved; meanwhile, the powder weighing mechanism is matched with the mixing strength self-adjusting driving mechanism, the stirring strength is adjusted in a self-adaptive mode according to the powder amount of the oil bearing, and the product quality is guaranteed; in addition, the dust filtering mechanism and the mixing strength self-adjusting driving mechanism cooperate, dust is effectively filtered, the working environment is optimized, and the powder metallurgy mixing efficiency, quality and environmental friendliness of the oil bearing are integrally improved.

Description

Technical Field

[0001] The invention belongs to the technical field of powder metallurgy mixing, and particularly relates to an oil-impregnated bearing powder metallurgy mixer and a using method thereof. Background Art

[0002] Due to its self-lubrication, low noise and good wear resistance, oil-impregnated bearings are widely used in fields such as automobiles, household appliances, and power tools. As a key process for preparing oil-impregnated bearings, powder metallurgy technology has a core link of the mixing process. Therefore, the use of an oil-impregnated bearing powder metallurgy mixer is crucial. Currently, the general mixer adopts a cylindrical mixing structure, such as a powder metallurgy mixer disclosed in the publication number: CN203091739U. However, during the mixing process, oil-impregnated bearing powders of different particle sizes play different roles in optimizing the bearing performance. The existing equipment cannot achieve the linkage of screening and mixing, resulting in the inability to accurately allocate powders of different particle sizes, making it difficult to fully exert the material performance advantages, and ultimately affecting the overall use performance of the oil-impregnated bearing. In addition, due to the different requirements for mixing intensity of oil-impregnated bearing powders of different grades, too high a mixing intensity is likely to cause excessive crushing and refinement of the oil-impregnated bearing powders, changing the original particle size distribution of the materials and damaging the performance of the oil-impregnated bearing powders. Too low a mixing intensity will result in insufficient mixing of the materials, causing stratification and segregation phenomena, resulting in poor mixing uniformity.

[0003] Therefore, an oil-impregnated bearing powder metallurgy mixer and a using method thereof are proposed. Summary of the Invention

[0004] The purpose of the invention is to solve the above problems and provide an oil-impregnated bearing powder metallurgy mixer and a using method thereof.

[0005] To achieve the above purpose, the invention adopts the following technical solutions: An oil-impregnated bearing powder metallurgy mixer includes a machine shell and a plurality of mixing chambers arranged inside the machine shell. Stirrers are rotatably arranged inside the plurality of mixing chambers. Discharge pipes are fixedly arranged at the bottoms of the plurality of mixing chambers, and electric gate valves are arranged on the pipe walls of the discharge pipes. The mixer further includes: A feed cover detachably arranged on the top of the machine shell. A grading and screening mechanism is arranged inside the feed cover, and the grading and screening mechanism corresponds to the positions of the plurality of mixing chambers. A feed cover is arranged on one side of the top of the feed cover; A mixing intensity self-adjusting driving mechanism arranged at the bottom of the machine shell. The mixing intensity self-adjusting driving mechanism is connected to the lower ends of the plurality of stirrers, and the mixing intensity self-adjusting driving mechanism is used to drive the plurality of stirrers to rotate; A plurality of powder weighing mechanisms respectively arranged at the bottoms of the plurality of mixing chambers for weighing the screened powder materials; A dust filtering mechanism is arranged on the side walls of the casing and the feeding cover, and the dust filtering mechanism is connected to the mixing intensity self-adjusting driving mechanism; A PLC controller is fixedly arranged on the side wall of the casing, and the electric gate valve, the mixing intensity self-adjusting driving mechanism, the powder weighing mechanism and the dust filtering mechanism are all electrically connected to the PLC controller.

[0006] Preferably, the grading and screening mechanism includes a screening plate fixedly arranged obliquely inside the feeding cover. First screening meshes, second screening meshes and third screening meshes are arranged on the surface of the screening plate at positions corresponding to a plurality of the mixing chambers. Partition plates are fixedly arranged on both sides of the upper surface of the screening plate inside the feeding cover. Guide cylinders are fixedly arranged between the tops of the plurality of mixing chambers and the first screening meshes, the second screening meshes and the third screening meshes.

[0007] Preferably, the mixing intensity self-adjusting driving mechanism includes a base fixedly arranged at the bottom of the casing. A plurality of evenly distributed magnetic powder clutches are fixedly arranged at the bottom of the casing. The lower ends of the plurality of stirrers all extend to the bottom of the casing and are respectively fixedly connected to the upper ends of the rotating shafts of the plurality of magnetic powder clutches. First anti-dropping sprockets are fixedly arranged at the lower ends of the rotating shafts of the two magnetic powder clutches on both sides. A second anti-dropping sprocket is fixedly arranged at the lower end of the rotating shaft of the middle magnetic powder clutch. A first chain is meshed between the two first anti-dropping sprockets and the second anti-dropping sprocket. A motor is fixedly arranged on one side of the top of the base, and a driving shaft is fixedly arranged at the output end of the motor. The upper end of the driving shaft is fixedly connected to the lower end of the rotating shaft of one of the magnetic powder clutches.

[0008] Preferably, the powder weighing mechanism includes two weighing sensors symmetrically arranged at the bottom of the mixing chamber. A sealed weighing plate that is hermetically and slidably arranged on the side wall of the mixing chamber is fixedly arranged at the tops of the two weighing sensors.

[0009] Preferably, a rubber hose is fixedly arranged on one side of the sealed weighing plate, and the lower end of the rubber hose is fixedly connected to the upper end of the discharge pipe. Sealing assemblies are arranged between the shaft wall of the stirrer, the middle of the sealed weighing plate and the bottom of the casing.

[0010] Preferably, the dust filtering mechanism includes a filter box fixedly arranged on the side wall of the casing. A filter bag is fixedly arranged inside the filter box. A suction fan blade is arranged below the filter bag inside the filter box. A suction pipe is fixedly arranged between the top of the filter box and the side wall of the feeding cover. An exhaust pipe is fixedly arranged on one side of the bottom of the filter box, and a box cover is arranged at the top of the filter box. An air inlet pipe is fixedly arranged on the side of the feeding cover away from the suction pipe, and a dust-proof net is fixedly arranged inside the air inlet pipe. A linkage mechanism is arranged at the bottom of the filter box.

[0011] Preferably, the linkage mechanism includes a third anti-dropping sprocket fixedly arranged on the driving shaft. A linkage shaft is rotatably arranged at the bottom of the filter box. The upper end of the linkage shaft is fixedly connected to the exhaust fan blade, and the lower end of the linkage shaft is fixedly provided with a fourth anti-dropping sprocket. A second chain is meshed between the third anti-dropping sprocket and the fourth anti-dropping sprocket.

[0012] Preferably, mounting plates are arranged between the two sides of the machine shell and the two sides of the feeding cover. Screws are fixedly arranged on the two sides of the machine shell and the two sides of the feeding cover. Both ends of the mounting plate pass through the rod walls of two adjacent screws, and nuts that cooperate with each other are arranged on the rod walls of the screws.

[0013] A using method of an oil-impregnated bearing powder metallurgy mixer, the using method comprising the following steps: S1. Preparation work, connect the power supply of the device to supply power to the whole equipment. Then, operate the PLC controller to start the motor and the weighing sensor, so that the motor enters the standby working state, and the weighing sensor is ready to measure the weight. S2. Powder screening, open the feeding cover, insert the feeding pipe containing the oil-impregnated bearing powder into the feeding port of the feeding cover, and let the oil-impregnated bearing powder fall on the inclined screening plate. Due to the inclination of the screening plate, the oil-impregnated bearing powder will sequentially pass through the first screening mesh, the second screening mesh and the third screening mesh, and the oil-impregnated bearing powder can be graded and screened. The screened oil-impregnated bearing powder falls into the interior of the mixing chambers at different positions through the guide cylinder. S3. Mixing and stirring intensity adjustment, after the motor starts to operate at a constant power, it drives the driving shaft to rotate. The driving shaft drives the rotating shaft of a magnetic powder clutch connected thereto to rotate. Through the transmission of the first anti-dropping sprocket, the second anti-dropping sprocket and the first chain, the rotating shafts of multiple magnetic powder clutches rotate, and then drive the stirrers mounted on their upper ends to rotate, so as to stir and mix the oil-impregnated bearing powder in the mixing chamber. As the screening continues, the amount of oil-impregnated bearing powder in the mixing chamber increases and the weight value increases. The PLC controller adjusts the output current according to the received weight change, changes the exciting current of the magnetic powder clutch. When the amount of oil-impregnated bearing powder increases, the PLC controller increases the output current to increase the exciting current of the magnetic powder clutch and accelerate the rotation speed of the stirrer, realizing the adaptive adjustment of the stirring intensity and ensuring the product quality. S4. Dust treatment and discharging, when the motor drives the driving shaft to rotate, the third anti-dropping sprocket mounted on the driving shaft rotates accordingly. The third anti-dropping sprocket drives the fourth anti-dropping sprocket to rotate through the second chain, so that the linkage shaft rotates, and then drives the exhaust fan blade to operate, so as to form a negative pressure in the exhaust pipe, suck the dust gas in the feeding cover into the exhaust pipe. After the dust gas enters the filter box, it is filtered by the filter bag, and the clean gas is then discharged through the exhaust pipe.

[0014] Compared with the prior art, the present invention has the following beneficial effects: By setting up a grade screening mechanism and a mixing strength self-adjusting driving mechanism, and utilizing the inclined design of the screening plate and the first screening net, the second screening net, and the third screening net with successively increasing apertures, the oil-containing bearing powder can be graded and screened, and the screened oil-containing bearing powder directly falls into the corresponding mixing chamber. At the same time, the mixing strength self-adjusting driving mechanism drives the agitator to stir and mix the oil-containing bearing powder in each mixing chamber, thereby realizing the linkage of screening and mixing, accurately allocating oil-containing bearing powders of different particle sizes, giving full play to the material performance advantages, and effectively improving the performance of oil-containing bearing products.

[0015] Through the cooperation of the powder weighing mechanism and the mixing intensity self-adjusting driving mechanism, the weight of the oil-containing bearing powder in the mixing chamber is measured in real time, and the data is transmitted to the PLC controller. The PLC controller adjusts the excitation current of the magnetic powder clutch by changing the output current according to the change in weight value, and then adjusts the speed of the agitator to achieve adaptive adjustment of the stirring intensity, avoiding the problem of excessive crushing of the oil-containing bearing powder due to excessive stirring intensity, affecting the internal structure and performance, and uneven mixing due to insufficient stirring intensity, thereby ensuring the stability and consistency of product quality.

[0016] By linking the dust filtering mechanism with the mixing intensity self-adjusting driving mechanism, the motor drives the exhaust fan blades to rotate, and the dust gas in the feed hood is sucked into the filter box, and the clean gas is discharged after being filtered by the filter bag. At the same time, the air inlet pipe maintains the air pressure balance in the feed hood, and its internal filter screen blocks the entry of external dust. The suction intensity is low during the whole process, which avoids the secondary lifting of oil-containing bearing powder. It not only optimizes the working environment, but also prevents the adverse effects of dust on product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a stereoscopic diagram of a first-angle view of an oil-containing bearing powder metallurgy mixer provided by the present invention; Figure 2 It is a stereoscopic diagram of a second viewing angle of an oil-containing bearing powder metallurgy mixer provided by the present invention; Figure 3 It is a three-dimensional view of the top of a feed cover of an oil-containing bearing powder metallurgy mixer provided by the present invention; Figure 4 It is a three-dimensional diagram of a housing and a feed cover of an oil-containing bearing powder metallurgy mixer provided by the present invention; Figure 5 It is a three-dimensional diagram of a self-adjusting driving mechanism for mixing strength of an oil-containing bearing powder metallurgy mixer provided by the present invention after the casing is cut open; Figure 6It is a three-dimensional view of a powder weighing mechanism inside the mixing chamber of a powder metallurgy mixer for oil-impregnated bearings provided by the present invention; Figure 7 It is a three-dimensional view of a dust filtering mechanism of a powder metallurgy mixer for oil-impregnated bearings provided by the present invention.

[0018] In the figure: 1 machine shell, 2 mixing chamber, 3 stirrer, 4 discharge pipe, 5 electric gate valve, 6 feed cover, 7 grading and screening mechanism, 71 screening plate, 72 first screening mesh, 73 second screening mesh, 74 third screening mesh, 75 partition plate, 76 guide cylinder, 8 feed lid, 9 mixing strength self-adjusting drive mechanism, 91 base, 92 magnetic powder clutch, 93 first anti-detachment sprocket, 94 second anti-detachment sprocket, 95 first chain, 96 motor, 97 drive shaft, 10 powder weighing mechanism, 101 weighing sensor, 102 sealed weighing plate, 103 rubber hose, 11 dust filtering mechanism, 111 filter box, 112 filter bag, 113 exhaust fan blade, 114 exhaust duct, 115 discharge duct, 116 box cover, 117 intake duct, 118 dust-proof net, 12 PLC controller, 13 linkage mechanism, 131 third anti-detachment sprocket, 132 linkage shaft, 133 fourth anti-detachment sprocket, 134 second chain, 14 mounting plate, 15 screw, 16 nut. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0020] As Figures 1-7 shown, a powder metallurgy mixer for oil-impregnated bearings includes a machine shell 1 and a plurality of mixing chambers 2 provided inside the machine shell 1. Stirrers 3 are rotatably provided inside the plurality of mixing chambers 2, discharge pipes 4 are fixedly provided at the bottoms of the plurality of mixing chambers 2, and an electric gate valve 5 is provided on the pipe wall of the discharge pipe 4. It further includes: A feed cover 6, which is detachably provided at the top of the machine shell 1. Mounting plates 14 are provided between the two sides of the machine shell 1 and the two sides of the feed cover 6. Screws 15 are fixedly provided on the two sides of the machine shell 1 and the two sides of the feed cover 6. The two ends of the mounting plate 14 pass through the rod walls of the adjacent two screws 15, and nuts 16 that cooperate with each other are provided on the rod walls of the screws 15. When it is necessary to clean the inside of the mixing chamber 2 or the first screening mesh 72, the second screening mesh 73 and the third screening mesh 74, the staff loosens the nut 16 with a wrench and removes the mounting plate 14 from the screw 15, so that the feed cover 6 and the machine shell 1 can be detachably separated.

[0021] Inside the feed cover 6, a grading and screening mechanism 7 is provided. The grading and screening mechanism 7 corresponds to the positions of multiple mixing chambers 2. On one side of the top of the feed cover 6, a feed cover 8 is provided. The feed cover 8 is hermetically hinged to the feed inlet at the top of the feed cover 6. The grading and screening mechanism 7 includes a screening plate 71 fixedly arranged obliquely inside the feed cover 6. At the positions corresponding to the multiple mixing chambers 2 on the surface of the screening plate 71, a first screening mesh 72, a second screening mesh 73, and a third screening mesh 74 are respectively arranged. On both sides of the upper surface of the screening plate 71 inside the feed cover 6, partition plates 75 are fixedly provided. Between the tops of the multiple mixing chambers 2 and the first screening mesh 72, the second screening mesh 73, and the third screening mesh 74, guide cylinders 76 are fixedly provided. The oil-impregnated bearing powder is fed onto the surface of the screening plate 71, and the oil-impregnated bearing powder automatically flows downward along the inclined surface of the screening plate 71 and successively passes through the first screening mesh 72, the second screening mesh 73, and the third screening mesh 74. Since the pore diameters of the first screening mesh 72, the second screening mesh 73, and the third screening mesh 74 increase in sequence, the oil-impregnated bearing powder can be graded and screened.

[0022] A mixing intensity self-adjusting driving mechanism 9 is arranged at the bottom of the machine shell 1. The mixing intensity self-adjusting driving mechanism 9 is connected to the lower ends of multiple stirrers 3, and the mixing intensity self-adjusting driving mechanism 9 is used to drive the multiple stirrers 3 to rotate. The mixing intensity self-adjusting driving mechanism 9 includes a base 91 fixedly arranged at the bottom of the machine shell 1. At the bottom of the machine shell 1, multiple evenly distributed magnetic powder clutches 92 are fixedly provided. The lower ends of the multiple stirrers 3 all extend to the bottom of the machine shell 1 and are respectively fixedly connected to the upper ends of the rotating shafts of the multiple magnetic powder clutches 92. At the lower ends of the rotating shafts of the two side magnetic powder clutches 92, first anti-dropping sprockets 93 are fixedly provided. At the lower end of the rotating shaft of the middle magnetic powder clutch 92, a second anti-dropping sprocket 94 is fixedly provided. Between the two first anti-dropping sprockets 93 and the second anti-dropping sprocket 94, a first chain 95 is meshed. On one side of the top of the base 91, a motor 96 is fixedly provided, and the output end of the motor 96 is fixedly provided with a driving shaft 97. The upper end of the driving shaft 97 is fixedly connected to the lower end of the rotating shaft of one of the magnetic powder clutches 92. The motor 96 can drive the driving shaft 97 to rotate, and the driving shaft 97 then drives the rotating shaft of one of the magnetic powder clutches 92 to rotate. Since the rotating shafts of the multiple magnetic powder clutches 92 are connected by the first anti-dropping sprockets 93, the second anti-dropping sprocket 94, and the second chain 134, the rotation of the rotating shaft of one magnetic powder clutch 92 can drive the rotating shafts of the multiple magnetic powder clutches 92 to rotate. At the same time, the stirrers 3 installed at the upper ends of the rotating shafts of the multiple magnetic powder clutches 92 will also rotate accordingly and agitate and mix the oil-impregnated bearing powder in the multiple mixing chambers 2.

[0023] Multiple powder weighing mechanisms 10 are respectively arranged at the bottoms of multiple mixing chambers 2 for weighing the screened powder materials. The powder weighing mechanism 10 includes two weighing sensors 101 symmetrically arranged at the bottom of the mixing chamber 2. At the tops of the two weighing sensors 101, a sealed weighing plate 102 is fixedly arranged and is in sealed sliding connection with the side wall of the mixing chamber 2. The sealed weighing plate 102 can slide slightly up and down inside the mixing chamber 2, which can ensure the weighing of the oil-impregnated bearing powder falling on the surface of the sealed weighing plate 102. Here, the sealed sliding structure will not cause the oil-impregnated bearing powder to fall into the gap. One side of the sealed weighing plate 102 is fixedly provided with a rubber hose 103, and the lower end of the rubber hose 103 is fixedly connected to the upper end of the discharge pipe 4. The rubber hose 103 can not only provide space for the up and down movement of the sealed weighing plate 102, but also will not affect the oil-impregnated bearing powder falling into the inside of the discharge pipe 4. Sealing components are arranged between the shaft wall of the stirrer 3 and the middle of the sealed weighing plate 102 and the bottom of the machine shell 1. The sealing components can increase the sealing performance between the stirrer 3, the sealed weighing plate 102 and the machine shell 1.

[0024] The dust filtering mechanism 11 is arranged on the side walls of the machine housing 1 and the feeding cover 6. The dust filtering mechanism 11 is connected to the mixing strength self-adjusting driving mechanism 9. The dust filtering mechanism 11 includes a filtering box 111 fixedly arranged on the side wall of the machine housing 1. A filter bag 112 is fixedly arranged inside the filtering box 111. A suction fan blade 113 is arranged below the filter bag 112 inside the filtering box 111. A suction duct 114 is fixedly arranged between the top of the filtering box 111 and the side wall of the feeding cover 6. One side of the bottom of the filtering box 111 is fixedly provided with an exhaust duct 115. And a box cover 116 is arranged on the top of the filtering box 111. The box cover 116 is hermetically hinged to the top of the filtering box 111. And a fixed lock is arranged between the box cover 116 and the filtering box 111. An air inlet duct 117 is fixedly arranged on the side of the feeding cover 6 away from the suction duct 114. And a dust-proof net 118 is fixedly arranged inside the air inlet duct 117. A linkage mechanism 13 is arranged at the bottom of the filtering box 111. The linkage mechanism 13 includes a third anti-dropping sprocket 131 fixedly arranged on the driving shaft 97. A linkage shaft 132 is rotatably arranged at the bottom of the filtering box 111. The upper end of the linkage shaft 132 is fixedly connected to the suction fan blade 113. And a fourth anti-dropping sprocket 133 is fixedly arranged at the lower end of the linkage shaft 132. A second chain 134 is meshed between the third anti-dropping sprocket 131 and the fourth anti-dropping sprocket 133. The motor 96 can drive the driving shaft 97 to rotate, and the connected third anti-dropping sprocket 131 will also rotate accordingly. The third anti-dropping sprocket 131 is connected to the fourth anti-dropping sprocket 133 through the second chain 134, thereby driving the fourth anti-dropping sprocket 133 to rotate synchronously. The rotation of the fourth anti-dropping sprocket 133 causes the linkage shaft 132 to rotate. The upper end of the linkage shaft 132 is connected to the suction fan blade 113. As the linkage shaft 132 rotates, the suction fan blade 113 starts to operate. When the suction fan blade 113 rotates, the gas inside the filtering box 111 will be quickly discharged outwards through the exhaust duct 115. During this process, a negative pressure state will be formed inside the suction duct 114. Since the end of the suction duct 114 is connected to the feeding cover 6, this negative pressure will suck the dust gas in the feeding cover 6 into the suction duct 114. The dust gas enters the inside of the filtering box 111 along the suction duct 114. After being filtered by the filter bag 112, the clean gas is then discharged to the external environment through the exhaust duct 115.

[0025] The PLC controller 12 is fixedly arranged on the side wall of the machine housing 1. The electric gate valve 5, the mixing strength self-adjusting driving mechanism 9, the powder weighing mechanism 10 and the dust filtering mechanism 11 are all electrically connected to the PLC controller 12.

[0026] The operating principle of the present invention is described as follows: First, the staff turns on the power supply of the device, then manually operates the PLC controller 12 to start the motor 96 and the weighing sensor 101. Subsequently, the feeding cover 8 is manually opened, and the feeding pipe of the oil-impregnated bearing powder is inserted into the feeding port of the feeding cover 8, so that the oil-impregnated bearing powder is fed onto the surface of the screening plate 71. Since the screening plate 71 is inclined, the oil-impregnated bearing powder will automatically flow downward along the inclined surface of the screening plate 71 and pass through the first screening mesh 72, the second screening mesh 73, and the third screening mesh 74 in sequence. Since the pore sizes of the first screening mesh 72, the second screening mesh 73, and the third screening mesh 74 increase in sequence, the oil-impregnated bearing powder can be graded, and the screened oil-impregnated bearing powder will fall into the mixing chambers 2 at different positions; After the motor 96 is started, it rotates at a constant power, and the motor 96 drives the drive shaft 97 to rotate. The drive shaft 97 then drives the rotating shaft of one of the magnetic powder clutches 92 to rotate. Since the rotating shafts of the multiple magnetic powder clutches 92 are connected by the first anti-dropping sprocket 93, the second anti-dropping sprocket 94, and the second chain 134, the rotation of the rotating shaft of one magnetic powder clutch 92 can drive the rotating shafts of the multiple magnetic powder clutches 92 to rotate. At the same time, the stirrers 3 installed at the upper ends of the rotating shafts of the multiple magnetic powder clutches 92 will also rotate accordingly. During the rotation of the multiple stirrers 3, the oil-impregnated bearing powder in the multiple mixing chambers 2 can be stirred and mixed, so that the oil-impregnated bearing powder can be graded and mixed, and the oil-impregnated bearing powder with different particle sizes can be accurately formulated, enabling the oil-impregnated bearing powder to fully exert its performance advantages and improving the service performance of the oil-impregnated bearing products; When the screened oil-impregnated bearing powder falls into the mixing chamber 2, it lands on the upper surface of the sealed weighing plate 102. A weighing sensor 101 is installed on the lower surface of the sealed weighing plate 102, which can measure the weight of the sealed weighing plate 102 and the weight of the oil-impregnated bearing powder on it. The weighing sensor 101 converts the detected weight value into an electrical signal and sends it to the PLC controller 12. As the grading and screening continue, the amount of oil-impregnated bearing powder falling into the mixing chamber 2 gradually increases, and the weight value detected by the weighing sensor 101 will also increase accordingly. The PLC controller 12 controls the magnetic powder clutch 92 at the bottom of the mixing chamber 2 according to the change of the received weight value. The PLC controller 12 adjusts the excitation current of the magnetic powder clutch 92 by changing the magnitude of the output current. The change of the excitation current will change the magnetic state of the magnetic powder inside the magnetic powder clutch 92, and then change the frictional force between the active part and the driven part of the clutch. When the amount of oil-impregnated bearing powder increases and the weight value detected by the weighing sensor 101 increases, the PLC controller 12 correspondingly increases the output current, so that the excitation current of the magnetic powder clutch 92 increases (the initial access current of the magnetic powder clutch 92 is small, so the initial stirring speed of the stirrer 3 is slow to avoid high-intensity stirring and mixing of a small amount of oil-impregnated bearing powder falling in). The binding force between the magnetic powders becomes stronger, and the frictional force between the active part and the driven part of the magnetic powder clutch 92 increases. In this way, the driven part (i.e., the rotating shaft where the stirrer 3 is located) can rotate more quickly following the active part, thus increasing the rotation speed of the stirrer 3. By adaptively adjusting the stirring intensity of the stirrer 3 according to the amount of oil-impregnated bearing powder, the problem of excessive or too small stirring intensity of the stirrer 3 can be effectively avoided. Excessive stirring intensity may cause the oil-impregnated bearing powder to be overly broken, affecting its internal organizational structure and performance, and reducing the product quality. While too small stirring intensity cannot fully mix the oil-impregnated bearing powder, resulting in uneven mixing, which will also affect the quality stability and consistency of the product. By means of adaptive stirring intensity, the product quality can be guaranteed; During the operation of the motor 96 to drive the drive shaft 97 to rotate, the third anti-drop sprocket 131 connected thereto will also rotate accordingly. The third anti-drop sprocket 131 is connected to the fourth anti-drop sprocket 133 through the second chain 134, thereby driving the fourth anti-drop sprocket 133 to rotate synchronously. The rotation of the fourth anti-drop sprocket 133 causes the linkage shaft 132 to rotate as well. The upper end of the linkage shaft 132 is connected to the exhaust fan blade 113. As the linkage shaft 132 rotates, the exhaust fan blade 113 starts to operate. When the exhaust fan blade 113 rotates, it will quickly discharge the gas inside the filter box 111 to the outside through the exhaust duct 115. During this process, a negative pressure state will be formed inside the suction duct 114. Since the end of the suction duct 114 is connected to the feed hood 6, this negative pressure will suck the dust gas in the feed hood 6 into the suction duct 114. The dust gas will enter the inside of the filter box 111 along the suction duct 114. After being filtered by the filter bag 112, the clean gas will be discharged to the external environment through the exhaust duct 115. While the dust gas inside the feed hood 6 is being extracted, the intake duct 117 on the other side of the feed hood 6 plays a role in discharging the external gas into the feed hood 6 to ensure the air pressure balance inside the feed hood 6. Since a filter screen is provided inside the intake duct 117, it can effectively block the dust in the external gas and reduce the possibility of it entering the inside of the feed hood 6. During the entire process of sucking the dust gas, the suction intensity of the gas is small and the air flow is relatively gentle. Therefore, it will not cause the secondary lifting of the powder of the oil-impregnated bearing, avoiding the adverse effects on the working environment and product quality. During the continuous filtration of the dust gas, the dust gas continuously passes through the filter bag 112, and more and more powder particles will accumulate inside the filter bag 112. When the accumulation reaches a certain level and needs to be cleaned, just open the lid 116 on the top of the filter box 111 to clean the powder particles accumulated inside the filter bag 112, ensuring that the filter bag 112 always maintains good filtering performance and maintaining the efficient operation of the entire filtration system; After the oil-impregnated bearing powder completes the grading and mixing processes, the staff manually operates the PLC controller 12 to control the electric gate valve 5. At this time, the valve plate inside the electric gate valve 5 will open under the instruction of the controller, and the oil-impregnated bearing powder in the mixing chamber 2 will be discharged outward through the discharge pipe 4.

[0027] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An oil-containing bearing powder metallurgy mixer and its usage method, comprising a machine shell (1) and a plurality of mixing chambers (2) arranged inside the machine shell (1). A stirrer (3) is rotatably arranged inside each of the plurality of mixing chambers (2). A discharge pipe (4) is fixedly arranged at the bottom of each of the plurality of mixing chambers (2), and an electric gate valve (5) is arranged on the pipe wall of the discharge pipe (4). It is characterized in that, It further includes: A feed cover (6), detachably arranged on the top of the casing (1). A grading and screening mechanism (7) is arranged inside the feed cover (6). The grading and screening mechanism (7) corresponds to the positions of a plurality of the mixing chambers (2). A feed cover (8) is arranged on one side of the top of the feed cover (6); A mixing intensity self-adjusting driving mechanism (9), arranged at the bottom of the casing (1). The mixing intensity self-adjusting driving mechanism (9) is connected to the lower ends of a plurality of the stirrers (3), and the mixing intensity self-adjusting driving mechanism (9) is used to drive a plurality of the stirrers (3) to rotate; A plurality of powder weighing mechanisms (10), respectively arranged at the bottoms of a plurality of the mixing chambers (2), for weighing the screened powder materials; A dust filtering mechanism (11), arranged on the side walls of the casing (1) and the feed cover (6). The dust filtering mechanism (11) is connected to the mixing intensity self-adjusting driving mechanism (9); A PLC controller (12), fixedly arranged on the side wall of the casing (1). The electric gate valve (5), the mixing intensity self-adjusting driving mechanism (9), the powder weighing mechanism (10) and the dust filtering mechanism (11) are all electrically connected to the PLC controller (12).

2. The oil-impregnated bearing powder metallurgy mixer and its usage method according to claim 1, characterized in that, The grading and screening mechanism (7) includes a screening plate (71) fixedly arranged obliquely inside the feed cover (6). First screening meshes (72), second screening meshes (73) and third screening meshes (74) are arranged on the surface of the screening plate (71) corresponding to the positions of a plurality of the mixing chambers (2). Partition plates (75) are fixedly arranged on both sides of the upper surface of the screening plate (71) inside the feed cover (6). Guide cylinders (76) are fixedly arranged between the tops of a plurality of the mixing chambers (2) and the first screening meshes (72), second screening meshes (73) and third screening meshes (74).

3. The oil-impregnated bearing powder metallurgy mixer and its usage method according to claim 2, characterized in that, The mixing intensity self-adjusting driving mechanism (9) includes a base (91) fixedly arranged at the bottom of the casing (1). A plurality of uniformly distributed magnetic powder clutches (92) are fixedly arranged at the bottom of the casing (1). The lower ends of a plurality of the stirrers (3) all extend to the bottom of the casing (1) and are respectively fixedly connected to the upper ends of the rotating shafts of a plurality of the magnetic powder clutches (92). First anti-drop sprockets (93) are fixedly arranged at the lower ends of the rotating shafts of the magnetic powder clutches (92) on both sides. A second anti-drop sprocket (94) is fixedly arranged at the lower end of the rotating shaft of the middle magnetic powder clutch (92). A first chain (95) is meshed between the two first anti-drop sprockets (93) and the second anti-drop sprocket (94). A motor (96) is fixedly arranged on one side of the top of the base (91), and a driving shaft (97) is fixedly arranged at the output end of the motor (96). The upper end of the driving shaft (97) is fixedly connected to the lower end of the rotating shaft of one of the magnetic powder clutches (92).

4. A powder metallurgy mixer for oil-impregnated bearings and its usage method according to claim 3, characterized in that, The powder weighing mechanism (10) includes two weighing sensors (101) symmetrically arranged at the bottom of the mixing chamber (2). A sealed weighing plate (102) that is hermetically and slidably arranged on the side wall of the mixing chamber (2) is fixedly provided at the top of the two weighing sensors (101).

5. A powder metallurgy mixer for oil-impregnated bearings and its usage method according to claim 4, characterized in that, A rubber hose (103) is fixedly provided on one side of the sealed weighing plate (102), and the lower end of the rubber hose (103) is fixedly connected to the upper end of the discharge pipe (4). Sealing assemblies are arranged between the shaft wall of the stirrer (3) and the middle of the sealed weighing plate (102) and the bottom of the machine housing (1).

6. The oil-impregnated bearing powder metallurgy mixer and its usage method according to claim 5, characterized in that The dust filtering mechanism (11) includes a filter box (111) fixedly arranged on the side wall of the machine housing (1). A filter bag (112) is fixedly arranged inside the filter box (111). An exhaust fan blade (113) is arranged below the filter bag (112) inside the filter box (111). An exhaust duct (114) is fixedly arranged between the top of the filter box (111) and the side wall of the feed hood (6). A discharge duct (115) is fixedly arranged on one side of the bottom of the filter box (111), and a box cover (116) is arranged at the top of the filter box (111). An air inlet duct (117) is fixedly arranged on the side of the feed hood (6) away from the exhaust duct (114), and a dust-proof net (118) is fixedly arranged inside the air inlet duct (117). A linkage mechanism (13) is arranged at the bottom of the filter box (111).

7. The oil-impregnated bearing powder metallurgy mixer and its usage method according to claim 6, characterized in that, The linkage mechanism (13) includes a third anti-dropping sprocket (131) fixedly arranged on the drive shaft (97). A linkage shaft (132) is rotatably arranged at the bottom of the filter box (111). The upper end of the linkage shaft (132) is fixedly connected to the exhaust fan blade (113), and a fourth anti-dropping sprocket (133) is fixedly arranged at the lower end of the linkage shaft (132). A second chain (134) is meshed between the third anti-dropping sprocket (131) and the fourth anti-dropping sprocket (133).

8. The oil-impregnated bearing powder metallurgy mixer and its usage method according to claim 1, characterized in that, Mounting plates (14) are arranged between the two sides of the machine housing (1) and the two sides of the feed hood (6). Screws (15) are fixedly arranged on the two sides of the machine housing (1) and the two sides of the feed hood (6). Both ends of the mounting plate (14) pass through the rod walls of the adjacent two screws (15), and nuts (16) that cooperate with each other are arranged on the rod walls of the screws (15).

9. A method of using an oil-impregnated bearing powder metallurgy mixer as described in claim 7, characterized in that, The usage method includes the following steps: S1. Preparation work: Connect the power supply of the device to supply power to the entire equipment. Then, operate the PLC controller (12) to start the motor (96) and the weighing sensor (101) to make the motor (96) enter the standby working state, and the weighing sensor (101) is ready to measure the weight. S2. Powder screening: Open the feed cover (8), insert the blanking pipe filled with oil-impregnated bearing powder into the feed port of the feed cover (8), and let the oil-impregnated bearing powder fall on the inclined screening plate (71). Due to the inclination of the screening plate (71), the oil-impregnated bearing powder will pass through the first screening mesh (72), the second screening mesh (73) and the third screening mesh (74) in sequence, enabling grading screening of the oil-impregnated bearing powder. The screened oil-impregnated bearing powder falls into the interior of the mixing chambers (2) at different positions through the material guide cylinder (76). S3. Mixing and stirring intensity adjustment: After the motor (96) starts running at a constant power, it drives the drive shaft (97) to rotate. The drive shaft (97) drives the rotating shaft of a magnetic powder clutch (92) connected thereto to rotate. Through the transmission of the first anti-drop sprocket (93), the second anti-drop sprocket (94) and the first chain (95), the rotating shafts of multiple magnetic powder clutches (92) rotate, and then drive the stirrer (3) installed at its upper end to rotate, stirring and mixing the oil-impregnated bearing powder in the mixing chamber (2). As the screening continues, the amount of oil-impregnated bearing powder in the mixing chamber (2) increases and the weight value increases. The PLC controller (12) adjusts the output current according to the received weight change, changes the excitation current of the magnetic powder clutch (92). When the amount of oil-impregnated bearing powder increases, the PLC controller (12) increases the output current, making the excitation current of the magnetic powder clutch (92) increase, accelerating the rotation speed of the stirrer (3), realizing the adaptive adjustment of the stirring intensity, and ensuring product quality. S4. Dust treatment and discharging: When the motor (96) drives the drive shaft (97) to rotate, the third anti-drop sprocket (131) installed on the drive shaft (97) rotates accordingly. The third anti-drop sprocket (131) drives the fourth anti-drop sprocket (133) to rotate through the second chain (134), making the linkage shaft (132) rotate, and then driving the exhaust fan blade (113) to operate, creating a negative pressure in the exhaust pipe (114), sucking the dust gas in the feed hood (6) into the exhaust pipe (114). After the dust gas enters the filter box (111), it is filtered by the filter bag (112), and the clean gas is then discharged through the exhaust pipe (115).

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