A slurry mixer

Abstract

This invention discloses a slurry mixer, comprising a frame, a reducer mounted on top of the frame, a motor mounted on the reducer, a vertical stirring shaft whose upper end is fixedly connected to the output shaft of the reducer, a hub fixedly mounted on the lower end of the stirring shaft, and blades mounted on the hub. A rotating arm is rotatably connected to the hub. An end plate is located below the hub, and a connecting rod is provided between the end plate and the rotating arm. The end plate and the rotating arm are respectively hinged to one end of the connecting rod. A vertical push rod is fixedly mounted on the end plate. The reducer is equipped with a manual drive mechanism, or the stirring shaft is equipped with an automatic drive mechanism. When the slurry concentration changes, the working angle of the blades can be adjusted by the manual or automatic drive mechanism, thereby adjusting the working angle of the blades according to the slurry concentration. This reduces the power of the mixer while maintaining the stirring effect, achieving energy saving.

Description

Technical Field

[0001] This invention relates to the field of steel plant mixing equipment technology, and in particular to a slurry mixer. Background Technology

[0002] In the daily production of steel plants, many production processes require the use of vertical slurry tanks. The top of the slurry tank has an installation hole, and a vertical agitator is installed on top of the tank. The agitator's shaft extends into the interior of the slurry tank through the installation hole. The slurry tank contains slurry, which is a mixture of water and fine particles.

[0003] Currently, the blade installation angle of vertical mixers is fixed, and the rotation speed of the mixing shaft is also constant. The blade angle is selected based on the design value of the slurry concentration. However, in actual production, the slurry concentration is not constant, while the working angle of the blades is determined after installation and will not change. Therefore, when the slurry concentration is low, the amount of slurry discharged through the blades is fixed, and low-concentration slurry does not require such a high discharge volume, resulting in excess discharge volume and wasted electrical energy. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a slurry agitator to solve the problem that existing agitators, due to their fixed blade angles, result in excessive agitation and discharge when the slurry concentration is low, thus wasting electrical energy.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] A slurry mixer includes a frame, a reducer mounted on top of the frame, a motor mounted on the reducer, a vertical stirring shaft whose upper end is fixedly connected to the output shaft of the reducer, a hub fixedly mounted on the lower end of the stirring shaft, and blades mounted on the hub. A rotating arm is rotatably connected to the hub, the rotation axis of the rotating arm being perpendicular to the stirring shaft, and the blades are connected to the rotating arm. An end plate is provided below the hub, and a connecting rod is provided between the end plate and the rotating arm. The end plate and the rotating arm are respectively hinged to one end of the connecting rod. A vertical push rod is fixedly mounted on the end plate, and the hub and the stirring shaft are both slidably engaged with the push rod. The reducer is provided with a manual drive mechanism for driving the push rod up and down, or the stirring shaft is provided with an automatic drive mechanism for driving the push rod up and down.

[0007] Furthermore, the stirring shaft is hollow, and both the stirring shaft and the hub are fitted outside the push rod, with the top of the push rod extending out of the stirring shaft; the manual drive mechanism includes a threaded sleeve fixedly installed at the top of the push rod, a bearing housing fitted outside the threaded sleeve, and an upper bracket fitted outside the bearing housing. The threaded sleeve and the bearing housing are both coaxial with the push rod, the threaded sleeve is rotatably connected to the bearing housing, the bearing housing is threadedly connected to the bracket, and the bearing housing is fixedly connected to the reducer.

[0008] Furthermore, the lower part of the stirring shaft is hollow, and both the stirring shaft and the hub are sleeved outside the push rod; the automatic drive mechanism includes a sleeve rotatably connected to the outside of the stirring shaft, a vertical resistance plate fixedly installed outside the sleeve, and a torsion spring sleeved on the stirring shaft. One end of the torsion spring is fixedly connected to the sleeve, and the other end is fixedly connected to the stirring shaft. The stirring shaft has a vertical second groove at a position corresponding to the sleeve. A cylindrical pin that slides in cooperation with the stirring shaft is provided in the second groove. The cylindrical pin is fixedly connected to the push rod. The sleeve has a first groove that intersects with the space of the second groove. The outer end of the cylindrical pin is located in the first groove. The cylindrical pin slides in cooperation with the sleeve. The first groove is inclined.

[0009] Furthermore, after the sleeve twists and the torque of the torsion spring changes, the first groove drives the cylindrical pin to move vertically along the second groove, which in turn drives the push rod and end plate to move vertically. Through the connecting rod, the rotating arm rotates, causing the angle between the blade and the horizontal plane to change. The angle changes according to the following rule: the angle increases when the torque of the torsion spring increases, and the angle decreases when the torque of the torsion spring decreases.

[0010] Furthermore, the root of the blade is rotatably connected to the rotating arm, and the rotating arm is provided with a locking pin for locking the position of the blade.

[0011] Furthermore, a support plate is fixedly installed on the rotating arm, and the support plate supports one side of the blade.

[0012] Furthermore, a balance ring is fixedly installed near the bottom of the stirring shaft.

[0013] Furthermore, the center of the balance ring is a fixed sleeve fixedly mounted on the stirring shaft, and the outer edge of the balance ring consists of at least two arc-shaped counterweights, all of which are connected to the fixed sleeve.

[0014] The positive effects of this invention are:

[0015] 1. The present invention is provided with a manual drive mechanism and an execution mechanism. The execution mechanism includes an end plate and a connecting rod. The manual drive mechanism drives the end plate and the connecting rod to move through the push rod at the center of the stirring shaft of the stirrer. In turn, the connecting rod drives the blades connected to the hub to rotate, so that the working angle of the blades changes. Thus, the working angle of the blades can be adjusted according to the concentration of the slurry. Under the premise of satisfying the stirring effect, the amount of stirring slurry generated by the blades of the stirrer is reduced, thereby reducing the power of the stirrer and achieving the purpose of energy saving.

[0016] 2. The manual drive unit is equipped with a bracket, a bearing housing, and a threaded sleeve. The bearing housing is threadedly connected to the bracket and rotatably connected to the threaded sleeve. The threaded sleeve is fixedly connected to the push rod. By rotating the handwheel on the bearing housing, the push rod can be moved up and down through the bearing housing and threaded sleeve, which in turn moves the end plate up and down to adjust the working angle of the blades. During adjustment, it is not affected by the rotation of the stirring shaft, so the stirrer does not need to be stopped.

[0017] 3. This invention includes an automatic drive mechanism comprising a resistance plate, a sleeve, and a torsion spring. The sleeve is fitted onto the stirring shaft. The resistance plate changes the angular position of the sleeve relative to the stirring shaft according to the slurry concentration, thereby driving the push rod to move up and down and adjusting the working angle of the impeller. The adjustment process is automatic and requires no human intervention. Because the adjustment is performed through a mechanical structure, it has high reliability.

[0018] 4. The blades and hub are hinged, allowing the blades to be folded up during installation, saving time and effort and improving installation efficiency.

[0019] 5. The present invention has a balance ring on the stirring shaft, which can improve the working stability of the stirrer. Attached Figure Description

[0020] Figure 1 These are schematic diagrams of the structures in Examples 1, 3, and 4;

[0021] Figure 2 This is a structural schematic diagram of Example 2;

[0022] Figure 3 This is a schematic diagram showing the connection between the actuator and one of the blades;

[0023] Figure 4 yes Figure 3 The left view;

[0024] Figure 5 These are schematic diagrams of the manual drive mechanisms in Examples 1, 3, and 4;

[0025] Figure 6 This is a schematic diagram of the external shape of the automatic drive mechanism in Embodiment 2;

[0026] Figure 7 yes Figure 6 A schematic diagram of the stirring shaft located at the middle sleeve;

[0027] In the picture:

[0028] 1. Blade; 2. Actuator; 3. Stirring shaft; 4. Slurry tank; 5. Motor; 6. Manual drive mechanism; 7. Reducer; 8. Hub; 9. Automatic drive mechanism; 10. End plate; 11. Connecting rod; 12. Boss; 13. Rotary arm; 14. Push rod; 15. Support plate; 16. Locking pin; 17. Bushing; 18. Gear; 19. Housing; 20. Bracket; 21. Bearing box; 22. Handwheel; 23. Second round nut; 24. Thrust bearing; 25. Screw sleeve; 26. Pressure cap; 27. First nut; 28. Sliding key; 29. ​​Sealing cap; 30. Resistance plate; 31. Connecting rod; 32. Sleeve; 33. Retaining ring; 34. Torsion spring; 35. Cylindrical pin; 36. Second groove; 37. First groove; 38. Balance ring. Detailed Implementation

[0029] like Figure 1 and Figure 5 As shown, the current agitator, installed at the mounting hole on the top of the slurry tank 4, includes a frame connected to the top of the slurry tank 4, a reducer 7 mounted on the frame, a motor 5 connected to the reducer 7, and an agitator shaft 3. A bushing 17 is fixed inside the gear 18 at the output end of the reducer 7. The upper end of the agitator shaft 3 passes through the bushing 17 and is connected to the bushing 17 by a first round nut 27 screwed onto the top of the agitator shaft 3. The bushing 17 and the agitator shaft 3 are connected by a key. A sealing cover 29 is placed on the top surface of the reducer 7 housing 19 to prevent dust from entering the reducer 7 through the gap between the bushing 17 and the housing 19. A cylindrical hub 8 is threadedly connected to the lower end of the agitator shaft 3. Three blades 1 are evenly distributed along the circumference of the hub 8.

[0030] Example 1

[0031] like Figure 1 , Figure 3 and Figure 4 As shown, this embodiment makes the following improvements based on the existing stirrer.

[0032] The hub 8 has three cylindrical bosses 13 evenly distributed along the circumference. Each boss 13 is rotatably connected to a cylindrical rotating arm 13. The rotation axis of each rotating arm 13 is perpendicular to the stirring shaft 3. The three blades 1 are respectively connected to the outer end of the corresponding rotating arm 13.

[0033] An actuator 3 is provided on the hub 8. The actuator 3 includes a circular end plate 10 disposed below the hub 8. The diameter of the end plate 10 is larger than the diameter of the hub 8. A connecting rod 11 is provided between the end plate 10 and each rotating arm 13. The upper end of the connecting rod 11 is hinged to one side of the corresponding rotating arm 13, and the lower end is hinged to the end plate 10 near the edge. A vertical push rod 14 is fixedly mounted on the end plate 10 at its center position by screws. The hub 8 and the stirring shaft 3 are both slidably engaged with the push rod 14.

[0034] The reducer 7 is equipped with a manual drive mechanism 6 for driving the push rod 14 to move up and down.

[0035] Combination Figure 5 As shown, the stirring shaft 3 is hollow. Both the stirring shaft 3 and the hub 8 are fitted around the push rod 14. The top end of the push rod 14 extends out of the stirring shaft 3. A sliding key 28 is provided between the push rod 14 and the stirring shaft 3, so that the push rod 14 can slide vertically along the stirring shaft 3 and can also rotate synchronously with the stirring shaft 3. The manual drive mechanism 6 includes a threaded sleeve 25 fixedly connected to the top end of the push rod 14, a cylindrical bearing housing 21 fitted around the threaded sleeve 25, and a frustum-shaped bracket 20 fitted around the bearing housing 21.

[0036] The top of the threaded sleeve 25 is provided with a second round nut 23 that screws onto the top of the push rod 14 to prevent the threaded sleeve 25 from loosening. Both the threaded sleeve 25 and the bearing housing 21 are coaxial with the push rod 14. The threaded sleeve 25 has an annular protrusion in the middle, and thrust bearings 24 are provided on both the top and bottom of this protrusion, thereby achieving a rotatable connection between the threaded sleeve 25 and the bearing housing 21. The bearing housing 21 has pressure caps 26 on both the top and bottom, with sealing rings on the pressure caps 26. The pressure caps 26 are used to position the thrust bearings 24 and simultaneously seal the interior of the bearing housing 21 to prevent dust from entering. The bearing housing 21 is threaded to the top of the bracket 20, and the bottom of the bearing housing 21 is fixedly connected to the top surface of the reducer 7 housing 19 by screws. A handwheel 22 is screwed to the top of the bearing housing 21.

[0037] When the push rod 14 rotates with the stirring shaft 3, it drives the threaded sleeve 25 to rotate. Since a thrust bearing 24 is provided between the threaded sleeve 25 and the bearing housing 21, the bearing housing 21 will not rotate with the threaded sleeve 25. A wing screw is provided on one side of the upper part of the bracket 20. After tightening the wing screw, the position of the bearing housing 21 is locked.

[0038] When the handwheel 22 is turned, the bearing housing 21 moves vertically, which in turn moves the screw sleeve 25 and the push rod 14 up and down. As the push rod 14 moves up and down, it moves the end plate 10 up and down, pulling the rotating arm 13 via the connecting rod 11, thus rotating the arm 13 and adjusting the angle of the blade 1. The angle between the blade 1 and the horizontal plane can be adjusted from 0 degrees to 45 degrees, with the angle decreasing as the slurry concentration decreases. When the blade 1 rotates, the slurry flows from top to bottom under the influence of the blade 1. A larger angle results in a larger discharge volume through the stirring of the blade 1, while a smaller angle results in a smaller discharge volume through the stirring of the blade 1.

[0039] Therefore, when the slurry concentration is low, the stirring discharge rate can be appropriately reduced. By rotating the handwheel 22 to adjust the angle of the blade 1, the angle between the blade 1 and the horizontal plane is reduced, thereby reducing the stirring discharge rate. After the stirring discharge rate is reduced, the output power of the motor 5 is also reduced accordingly, thereby reducing the consumption of electrical energy and achieving the purpose of energy saving.

[0040] Example 2

[0041] like Figure 2 , Figure 6 and Figure 7 As shown, the difference between this embodiment and Embodiment 1 is that:

[0042] The manual drive device 6 is no longer provided; instead, an automatic drive mechanism 9 is installed on the stirring shaft 3. The lower part of the stirring shaft 3 is hollow, and both the stirring shaft 3 and the hub 8 are fitted onto the push rod 14.

[0043] The automatic drive mechanism 9 includes a sleeve 32 fitted around the stirring shaft 3, which is rotatably connected to the stirring shaft 3. The sleeve 32 has baffles on both its upper and lower surfaces, which are fixedly connected to the stirring shaft 3 by set screws. These baffles prevent the sleeve 32 from moving up and down. Two connecting rods 31 are welded to the outer circumference of the sleeve 32, symmetrically arranged about the stirring shaft 3. A vertical resistance plate 30 is welded to the outer end of each connecting rod 31. A fixing ring 33 is fixedly connected to the stirring shaft 3 above the sleeve 32. A torsion spring 34 is located between the fixing ring 33 and the sleeve 32, with one end of the torsion spring 34 engaged with the fixing ring 33 and the other end engaged with the sleeve 32.

[0044] The stirring shaft 3 has a vertical second groove 36 at a position corresponding to the sleeve 32. A cylindrical pin 35 that slides within the second groove 36 is provided and is fixedly connected to the push rod 14 near its top. The sleeve 32 has a first groove 37 that intersects with the second groove 36. The outer end of the cylindrical pin 35 is located within the first groove 37. The cylindrical pin 35 slides within the sleeve 32. The first groove 37 is spirally inclined along the circumference of the sleeve 32, with the inclination direction from the upper left to the lower right.

[0045] The stirring shaft 3 rotates clockwise (viewed from top to bottom). As the slurry concentration increases, the resistance plate 30 experiences greater resistance, causing the sleeve 32 to rotate counterclockwise relative to the stirring shaft 3 (viewed from top to bottom). This causes the torsion spring 34 to twist, increasing its torque until it balances with the torque generated by the resistance plate 30. At this point, under the action of the first groove 37, the cylindrical pin 35 moves vertically upward along the second groove 36, thereby driving the push rod 14 and end plate 10 to move vertically upward. This, in turn, drives the rotating arm 13 to rotate via the connecting rod 11, increasing the angle between the blade 1 and the horizontal plane, thus increasing the stirring discharge rate. Simultaneously, the output power of the motor 5 increases to adapt to the slurry concentration.

[0046] Similarly, when the slurry concentration decreases, the angle between the blade 1 and the horizontal plane decreases, thereby reducing the amount of slurry discharged during stirring. At the same time, the output power of the motor 5 decreases. Under the premise of ensuring the stirring effect, the output power of the motor 5 can be reduced to achieve the purpose of energy saving.

[0047] Example 3

[0048] like Figure 1 , Figure 3 and Figure 4 As shown, the difference between this embodiment and Embodiment 1 is that:

[0049] The outer part of the rotating arm 13 has notches. The root of the blade 1 is inserted into the corresponding notch. The root of the blade 1 is hinged to the rotating arm 13 by a pin. The rotating arm 13 has a locking pin 16 inserted next to the pin. After the locking pin 16 is inserted and a cotter pin is inserted at the tail of the locking pin 16, the position of the blade 1 is locked.

[0050] Since the diameter of the mounting hole at the top of the slurry tank 4 is much smaller than the diameter of the blade 1 when it rotates, and the blade 1 of the existing agitator is usually connected to the hub 8 by bolts, it is necessary to install the frame of the agitator, extend the agitator shaft 3 into the slurry tank 4, screw the hub 8 onto the lower end of the agitator shaft 3 first, and then install the blade 1 onto the hub 8. Therefore, the installation is time-consuming and labor-intensive, and the installation efficiency is low.

[0051] In this embodiment, before installing the frame, the screws at the bottom of the end plate 10 used to fix it to the push rod 14 can be removed. Then, the end plate 10 is moved along the axial direction of the hub 8, causing the rotating arm 13 to rotate until the blade 1 is parallel to the axis of the hub 8. After removing the locking pin 16, the blade 1 is folded so that it stands upright, allowing the hub 8 and the blade 1 to easily enter the slurry tank 4 through the mounting hole at the top of the slurry tank 4. Similarly, the blade 1 is unfolded, the locking pin 16 and the cotter pin on the locking pin 16 are inserted, and the push rod 14 is connected to the end plate 10 with screws to complete the installation of the blade 1. This method is convenient, quick, time-saving, labor-saving, and has high installation efficiency.

[0052] A support plate 15 is welded onto the rotating arm 13, and the support plate 15 supports one side of the blade 1. After the blade 1 is unfolded, the support plate 15 supports the side of the blade 1, thereby limiting the position of the blade 1. The holes on the rotating arm 13 and the blade for installing the locking pin 16 are aligned, thereby facilitating the installation of the locking pin 16.

[0053] Example 4

[0054] like Figure 1 As shown, the difference between this embodiment and Embodiment 1 is that:

[0055] The stirring shaft 3 has a balance ring 38 fixedly installed near the bottom. The center of the balance ring 38 is a fixed sleeve fixed to the stirring shaft 3 by a set screw. The outer edge of the balance ring 38 consists of three arc-shaped counterweights located on the same circumference. Each counterweight is fixedly connected to the fixed sleeve by a central rod.

[0056] When the stirring shaft 3 is long, the blades 1 are prone to wobbling when rotating. After setting the balance ring 38, the weight of the balance ring 38 is mainly distributed on its outer circle, away from its center. Due to the gyroscopic effect, the stirring shaft 3 is less prone to wobbling, thereby improving the stability of the stirrer during operation.

[0057] In actual installation, a streamlined fairing can be installed at the bottom of the end plate 10 to cover the end plate 1, hub 8 and connecting rod 11, thus protecting the end plate 1, hub 8 and connecting rod 11.

[0058] The above-described embodiments are detailed and specific, illustrating preferred embodiments of the present invention. They are only used to illustrate the technical ideas and features of the present invention, aiming to enable those skilled in the art to understand and implement the invention. However, they are not limited to the present invention, and the patent scope of the present invention should not be limited to these embodiments. Any equivalent changes or modifications made to the spirit disclosed in the present invention, without departing from the structure of the present invention, such as local improvements within the system and alterations or transformations between subsystems, are still within the patent scope of the present invention. Currently, the technical solution of this application has undergone pilot testing, i.e., small-scale experiments before large-scale mass production. After the pilot testing, user surveys were conducted on a small scale, and the survey results showed high user satisfaction. Preparations are now underway for the formal production and industrialization of the product, including intellectual property risk warning surveys.

Claims

1. A slurry mixer, comprising a frame, a reducer (7) disposed on the top of the frame, a motor (5) disposed on the reducer (7), a vertical stirring shaft (3) whose upper end is fixedly connected to the output shaft of the reducer (7), a hub (8) fixedly disposed on the lower end of the stirring shaft (3), and blades (1) disposed on the hub (8), characterized in that, A rotating arm (13) is rotatably connected to the hub (8). The rotation axis of the rotating arm (13) is perpendicular to the stirring shaft (3). The blade (1) is connected to the rotating arm (13). An end plate (10) is provided below the hub (8). A connecting rod (11) is provided between the end plate (10) and the rotating arm (13). The end plate (10) and the rotating arm (13) are respectively hinged to one end of the connecting rod (11). A vertical push rod (14) is fixedly provided on the end plate (10). The hub (8) and the stirring shaft (3) are both slidably engaged with the push rod (14). An automatic drive mechanism (9) is provided on the stirring shaft (3) to drive the push rod (14) to move up and down. The lower part of the stirring shaft (3) is hollow, and both the stirring shaft (3) and the hub (8) are sleeved outside the push rod (14); the automatic drive mechanism (9) includes a sleeve (32) rotatably connected to the outside of the stirring shaft (3), a vertical resistance plate (30) fixedly installed outside the sleeve (32), and a torsion spring (34) sleeved on the stirring shaft (3). One end of the torsion spring (34) is fixedly connected to the sleeve (32), and the other end is fixedly connected to the stirring shaft (3). The stirring shaft (3) is in contact with the sleeve (32) and the hub (8). 32) A vertical second groove (36) is provided at the corresponding position. A cylindrical pin (35) is provided in the second groove (36) and slides with the stirring shaft (3). The cylindrical pin (35) is fixedly connected to the push rod (14). A first groove (37) is provided on the sleeve (32) and intersects with the space of the second groove (36). The outer end of the cylindrical pin (35) is located in the first groove (37). The cylindrical pin (35) slides with the sleeve (32). The first groove (37) is inclined. When the sleeve (32) twists, the torque of the torsion spring (34) changes, and the first groove (37) drives the cylindrical pin (35) to move vertically along the second groove (36), which in turn drives the push rod (14) and the end plate (10) to move vertically. Through the connecting rod (11), the rotating arm (13) is driven to rotate, so that the angle between the blade (1) and the horizontal plane changes. The angle changes according to the following rules: when the torque of the torsion spring (34) increases, the angle increases; when the torque of the torsion spring (34) decreases, the angle decreases.

2. The slurry mixer according to claim 1, characterized in that, The root of the blade (1) is rotatably connected to the rotating arm (13), and the rotating arm (13) is provided with a locking pin (16) for locking the position of the blade (1).

3. A slurry mixer according to claim 2, characterized in that, A support plate (15) is fixedly installed on the rotating arm (13), and the support plate (15) supports one side of the blade (1).

4. A slurry mixer according to claim 1, characterized in that, The stirring shaft (3) is fixedly provided with a balance ring (38) near the bottom.

5. A slurry mixer according to claim 4, characterized in that, The center of the balance ring (38) is a fixed sleeve fixedly mounted on the stirring shaft (3), and the outer edge of the balance ring (38) consists of at least two arc-shaped counterweights, all of which are connected to the fixed sleeve.

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