Magnesium sulfate heptahydrate crystallization kettle

Abstract

The utility model relates to the technical field of magnesium sulfate heptahydrate crystallization equipment, in particular to a magnesium sulfate heptahydrate crystallization kettle, which is characterized in that an input port of a discharge pipe is blocked by a piston during crystallization, so that the discharge pipe is prevented from being blocked and medicaments are prevented from being mixed unevenly during discharge, and the reliability is good; comprising a kettle body, a discharging pipe and a feeding pipe, the upper part of the stirring shaft is movably connected with the top of the kettle body, the lower part of the stirring shaft extends into the crystallization chamber of the kettle body, a plurality of stirring rods are arranged at the lower part of the stirring shaft, the piston is arranged at the lower end of the stirring shaft, the piston is inserted into the discharging pipe in a sliding manner, and the spiral blade is arranged at the lower end of the piston; the spiral blade is located in the discharging pipe, the upper end of the stirring shaft is rotationally connected with the mounting plate, the multiple sliding rods are vertically mounted at the top of the kettle body, and the multiple sliding rods are in sliding limiting connection with the mounting plate.

Description

Technical Field

[0001] The utility model relates to the technical field of magnesium sulfate heptahydrate crystallization equipment, in particular to a magnesium sulfate heptahydrate crystallization kettle. Background Art

[0002] Magnesium sulfate used industrially generally refers to magnesium sulfate heptahydrate. Crystals with different water contents are precipitated by controlling the temperature of the 12-water crystal. When the temperature is controlled in the range of -1.8 to 48.18 °C in a saturated aqueous solution, magnesium sulfate heptahydrate is precipitated. During the crystallization process, a crystallization kettle is required for the reaction.

[0003] Chinese utility model patent with the publication number CN217015394U proposes a magnesium sulfate heptahydrate crystallization kettle. When the crystallization kettle stirs and cools for crystallization, the pushing and pulling mechanism pushes the spline shaft and the flexible auger downward through the connecting shaft, so that the flexible auger is located in the discharge pipe. While the pipe shaft and the stirring paddle rotate, the spline shaft sleeve drives the flexible auger to rotate synchronously through the spline shaft, so that the materials in the discharge pipe are in a stirred state, preventing blockage. During discharging, if the discharge pipe is not blocked, the pushing and pulling mechanism pulls the spline shaft and the flexible auger upward as a whole through the connecting shaft, so that the flexible auger is separated from the discharge pipe and located inside the pipe shaft. At this time, the flexible auger will not block the discharge of the discharge pipe and will not affect the discharge rate. If the discharge pipe is blocked during the discharging process, the flexible auger is pushed again to extend into the discharge pipe to stir and dredge the blocked materials inside the discharge pipe. The position of the flexible auger can be adjusted according to the actual use situation, and the flexibility is relatively high.

[0004] However, when the above-mentioned crystallization kettle is working for crystallization, the discharge pipe is connected to the inside of the crystallization kettle body, which is likely to cause the accumulation of chemicals and crystals in the discharge pipe, resulting in insufficient contact between the chemicals and the solution and easy blockage of the discharge pipe, and the reliability is poor. Summary of the Utility Model

[0005] To solve the above technical problems, the utility model provides a magnesium sulfate heptahydrate crystallization kettle with good reliability, in which a piston blocks the input port of the discharge pipe during crystallization, avoiding blockage of the discharge pipe and uneven mixing of chemicals during discharging.

[0006] A magnesium sulfate heptahydrate crystallization kettle of the utility model comprises a kettle body, a discharge pipe and a feed pipe. A crystallization chamber is arranged inside the kettle body. The discharge pipe is arranged at the bottom of the kettle body, and the feed pipe is arranged at the top of the kettle body. Both the discharge pipe and the feed pipe are communicated with the crystallization chamber of the kettle body. It also includes a stirring shaft, a piston, a spiral blade, a mounting plate and a plurality of slide bars. The upper part of the stirring shaft is movably connected with the top of the kettle body, the lower part of the stirring shaft extends into the crystallization chamber of the kettle body, a plurality of stirring rods are arranged at the lower part of the stirring shaft, a piston is arranged at the lower end of the stirring shaft, the piston is slidably inserted into the discharge pipe, a spiral blade is arranged at the lower end of the piston, the spiral blade is located in the discharge pipe, the upper end of the stirring shaft is rotatably connected with the mounting plate, and a plurality of slide bars are vertically installed at the top of the kettle body. The plurality of slide bars are slidably and limit-connected with the mounting plate. During operation, the stirring shaft descends so that the piston is inserted into the discharge pipe, and the piston blocks the input port of the discharge pipe. The crystallization agent and the solution are added into the crystallization chamber of the kettle body through the feed pipe. The stirring shaft rotates to drive a plurality of stirring rods to rotate and stir the agent and the solution, accelerating crystallization. Since the discharge pipe is blocked by the piston, the agent and the crystallization will not enter the discharge pipe and accumulate, so that the agent and the solution are evenly mixed. After crystallization is completed, the mounting plate drives the stirring shaft to rise, and the plurality of slide bars slide and limit-guide the mounting plate, so that the stirring shaft pulls the piston out of the input port of the discharge pipe, and the lower part of the spiral blade remains in the discharge pipe, and the upper part of the spiral blade extends into the bottom of the crystallization chamber of the kettle body, thereby opening the discharge pipe, so that the crystallization together with the solution is discharged through the discharge pipe. The stirring shaft rotates to drive the spiral blade to rotate, and the spiral blade accelerates the discharge of the crystallization through the discharge pipe, avoiding blockage of the discharge pipe by the crystallization and preventing blockage of the discharge pipe, with good reliability.

[0007] Preferably, it further includes a motor, a first bevel gear and a second bevel gear. The motor is installed on the mounting plate, the front output shaft of the motor is concentrically installed with the first bevel gear, the second bevel gear is concentrically installed at the upper end of the stirring shaft, and the second bevel gear meshes with the first bevel gear. The motor drives the first bevel gear to rotate, and the first bevel gear meshes with the second bevel gear to drive the stirring shaft to rotate, so that the stirring shaft drives a plurality of stirring rods and the spiral blade to rotate, with mature technology and good reliability.

[0008] Preferably, it further includes a drive shaft tube, a sun gear, a planetary gear disc, a housing, a swing arm and a pull rod. The front end of the drive shaft tube is in transmission connection with the rear output shaft of the motor. The sun gear is concentrically installed at the rear end of the drive shaft tube. A plurality of planetary gears are rotatably arranged on the front end face of the planetary gear disc. The sun gear meshes with the plurality of planetary gears simultaneously. The housing is installed on the mounting plate. A toothed ring is arranged on the inner wall of the housing. The plurality of planetary gears of the planetary gear disc mesh with the toothed ring of the housing. The rear end face of the planetary gear disc is rotatably connected to the piston. The inner end of the swing arm is in transmission connection with the center of the rear end face of the planetary gear disc. The upper end of the pull rod is rotatably connected to the swing arm. The lower end of the pull rod is rotatably connected to the top of the kettle body. During operation, the output shaft of the motor drives the drive shaft tube and the sun gear to rotate. The sun gear meshes with the plurality of planetary gears of the planetary gear disc to rotate. The plurality of planetary gears mesh with the toothed ring of the housing, thereby driving the planetary gear disc in the housing. The planetary gear disc drives the swing arm to rotate, achieving the deceleration effect of the output shaft of the motor. The swing arm pulls the mounting plate to lift and lower along the plurality of slide rods in the reverse direction, so that the mounting plate drives the stirring shaft to reciprocate up and down, making the plurality of stirring rods of the stirring shaft rotate and stir up and down during stirring, improving the stirring efficiency.

[0009] Preferably, it further includes a rotating shaft and a nut. A long chute is arranged on the swing arm. The rotating shaft is slidably inserted into the long chute of the swing arm. The nut locks the rotating shaft on the swing arm. The rotating shaft is rotatably connected to the upper end of the pull rod. Adjust the position of the rotating shaft in the long chute of the swing arm, and tighten the nut to lock the rotating shaft on the swing arm, thereby adjusting the lifting stroke of the stirring shaft, further increasing the distance between the rotating shaft and the inner end of the swing arm, so that when the stirring shaft rises, the piston can be lifted out of the discharge pipe and the spiral blade can be retained in the discharge pipe, realizing the adjustment of the lifting stroke of the stirring shaft and improving the practicability.

[0010] Preferably, it further includes an insertion block. The drive shaft tube is in insertion transmission connection with the rear output shaft of the motor. The insertion block is concentrically installed on the rear end face of the planetary gear disc. A spline hole is arranged at the center of the end face of the insertion block facing the sun gear. The spline hole matches the sun gear. The inner end of the swing arm is concentrically connected to the rear end face of the insertion block. Stretch the drive shaft tube along the rear output shaft of the motor, so that the sun gear meshes with the plurality of planetary gears of the planetary gear disc or the sun gear is inserted into the spline hole of the insertion block. After the sun gear is inserted into the spline hole of the insertion block, the sun gear directly drives the insertion block and the swing arm to rotate, realizing two-speed transmission of the swing arm rotation, thereby achieving different lifting and stirring effects.

[0011] Preferably, it further includes a locking bolt. The locking bolt is rotatably screwed on the drive shaft tube. The inner end of the locking bolt contacts and presses against the rear output shaft of the motor. After adjusting the position of the drive shaft tube and the rear output shaft of the motor, tighten the locking bolt so that the locking bolt presses against the rear output shaft of the motor, locking the drive shaft tube and the rear output shaft of the motor. The technology is mature and the locking effect is stable.

[0012] Preferably, a keyway is further included. A keyway is provided on the outer wall of the rear output shaft of the motor, and the keyway is parallel to the axis of the rear output shaft of the motor. The inner end of the locking bolt extends into the keyway, and the keyway limits the inner end of the locking bolt, improving the firmness of the locking bolt in locking the transmission shaft tube and the rear output shaft of the motor.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows: During operation, when the stirring shaft descends, the piston is inserted into the discharge pipe, blocking the input port of the discharge pipe. The crystallization agent and the solution are filled into the crystallization chamber of the kettle body through the feed pipe. The rotation of the stirring shaft drives the rotation of multiple stirring rods to stir the agent and the solution, accelerating crystallization. Since the discharge pipe is blocked by the piston, the agent and the crystallization will not enter the discharge pipe and accumulate, thus enabling the agent and the solution to be mixed evenly. After crystallization is completed, the mounting plate drives the stirring shaft to rise, and multiple sliding rods limit and guide the sliding of the mounting plate, causing the stirring shaft to lift the piston out of the input port of the discharge pipe and leaving the lower part of the spiral blade in the discharge pipe while the upper part of the spiral blade extends into the bottom of the crystallization chamber of the kettle body, thereby opening the discharge pipe and enabling the crystallization together with the solution to be discharged through the discharge pipe. The rotation of the stirring shaft drives the rotation of the spiral blade, and the spiral blade accelerates the discharge of the crystallization through the discharge pipe, preventing the discharge pipe from being blocked by the crystallization and avoiding blockage of the discharge pipe, with good reliability. Brief Description of the Drawings

[0014] Figure 1 is the structural schematic diagram of the present utility model;

[0015] Figure 2 is the axonometric structural schematic diagram of the present utility model;

[0016] Figure 3 is the partial sectional structural schematic diagram of the present utility model;

[0017] Figure 4 is the structural schematic diagram of structures such as the stirring shaft, piston, and spiral blade;

[0018] Figure 5 is the structural schematic diagram of structures such as the transmission shaft tube, sun gear, planetary gear disc, housing, swing arm, pull rod, and insertion block;

[0019] Figure 6 is the structural schematic diagram of the structures such as the transmission shaft tube, sun gear, planetary gear disc, housing, swing arm, pull rod, and insertion block in the disassembled state.

[0020] Reference numerals in the drawings: 1, kettle body; 2, discharge pipe; 3, feed pipe; 4, stirring shaft; 5, piston; 6, spiral blade; 7, mounting plate; 8, slide bar; 9, motor; 10, first bevel gear; 11, second bevel gear; 12, drive shaft tube; 13, sun gear; 14, planetary gear disc; 15, housing; 16, swing arm; 17, pull rod; 18, rotating shaft; 19, nut; 20, inserted block; 21, locking bolt; 22, keyway. Detailed implementation manners

[0021] For the convenience of understanding the present utility model, the present utility model will be described more comprehensively below with reference to the relevant drawings. The present utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided so that the disclosure of the present utility model is more thorough and comprehensive.

[0022] Embodiment 1

[0023] As Figures 1 to 4 shown, a magnesium sulfate heptahydrate crystallization kettle includes a kettle body 1, a discharge pipe 2 and a feed pipe 3. A crystallization chamber is arranged inside the kettle body 1. The discharge pipe 2 is arranged at the bottom of the kettle body 1, and the feed pipe 3 is arranged at the top of the kettle body 1. Both the discharge pipe 2 and the feed pipe 3 are communicated with the crystallization chamber of the kettle body 1. It further includes a stirring shaft 4, a piston 5, a spiral blade 6, a mounting plate 7 and a plurality of slide bars 8. The upper part of the stirring shaft 4 is movably connected to the top of the kettle body 1, the lower part of the stirring shaft 4 extends into the crystallization chamber of the kettle body 1, a plurality of stirring rods are arranged at the lower part of the stirring shaft 4, a piston 5 is arranged at the lower end of the stirring shaft 4, the piston 5 is slidably inserted into the discharge pipe 2, a spiral blade 6 is arranged at the lower end of the piston 5, the spiral blade 6 is located in the discharge pipe 2, the upper end of the stirring shaft 4 is rotatably connected to the mounting plate 7, and a plurality of slide bars 8 are vertically installed on the top of the kettle body 1. The plurality of slide bars 8 are slidably and limit-connected to the mounting plate 7. It further includes a motor 9, a first bevel gear 10 and a second bevel gear 11. The motor 9 is installed on the mounting plate 7, a first bevel gear 10 is concentrically installed on the front output shaft of the motor 9, a second bevel gear 11 is concentrically installed on the upper end of the stirring shaft 4, and the second bevel gear 11 meshes with the first bevel gear 10.

[0024] During operation, the stirring shaft 4 descends, causing the piston 5 to insert into the discharge pipe 2, blocking the input port of the discharge pipe 2. The crystallization agent and solution are filled into the crystallization chamber of the kettle body 1 through the feed pipe 3. The motor 9 drives the first bevel gear 10 to rotate, and the first bevel gear 10 meshes with the second bevel gear 11 to drive the stirring shaft 4 to rotate, causing the stirring shaft 4 to drive multiple stirring rods and spiral blades 6 to rotate. The rotation of the stirring shaft 4 drives the multiple stirring rods to stir the agent and solution, accelerating crystallization. Since the discharge pipe 2 is blocked by the piston 5, the agent and crystals will not enter the discharge pipe 2 and accumulate, thus making the agent and solution mix evenly. After crystallization is completed, the mounting plate 7 drives the stirring shaft 4 to rise, and the multiple sliding rods 8 slide and limit the guiding of the mounting plate 7, causing the stirring shaft 4 to lift the piston 5 out of the input port of the discharge pipe 2, and the lower part of the spiral blade 6 remains in the discharge pipe 2, while the upper part of the spiral blade 6 extends into the bottom of the crystallization chamber of the kettle body 1, thereby opening the discharge pipe 2 and enabling the crystals together with the solution to be discharged through the discharge pipe 2. The rotation of the stirring shaft 4 drives the spiral blade 6 to rotate, and the spiral blade 6 accelerates the discharge of the crystals through the discharge pipe 2, preventing the discharge pipe 2 from being blocked by the crystals and avoiding blockage of the discharge pipe 2.

[0025] Example 2

[0026] As Figures 5 to 6As shown in the figure, on the basis of Embodiment 1, it further includes a drive shaft tube 12, a sun gear 13, a planetary gear disc 14, a housing 15, a swing arm 16 and a pull rod 17. The front end of the drive shaft tube 12 is in transmission connection with the rear output shaft of the motor 9. The rear end of the drive shaft tube 12 is concentrically installed with the sun gear 13. A plurality of planetary gears are rotatably arranged on the front end face of the planetary gear disc 14. The sun gear 13 meshes with the plurality of planetary gears simultaneously. The housing 15 is installed on the mounting plate 7. A toothed ring is provided on the inner wall of the housing 15. The plurality of planetary gears of the planetary gear disc 14 mesh with the toothed ring of the housing 15. The rear end face of the planetary gear disc 14 is rotatably connected to the piston 5. The inner end of the swing arm 16 is in transmission connection with the center of the rear end face of the planetary gear disc 14. The upper end of the pull rod 17 is rotatably connected to the swing arm 16. The lower end of the pull rod 17 is rotatably connected to the top of the kettle body 1; it further includes a rotating shaft 18 and a nut 19. A long chute is provided on the swing arm 16. The rotating shaft 18 is slidably inserted into the long chute of the swing arm 16. The nut 19 locks the rotating shaft 18 on the swing arm 16. The rotating shaft 18 is rotatably connected to the upper end of the pull rod 17; it further includes an insertion block 20. The drive shaft tube 12 is in insertion transmission connection with the rear output shaft of the motor 9. The insertion block 20 is concentrically installed on the rear end face of the planetary gear disc 14. A spline hole is provided at the center of the end face of the insertion block 20 facing the sun gear 13. The spline hole matches the sun gear 13. The inner end of the swing arm 16 is concentrically connected to the rear end face of the insertion block 20; it further includes a locking bolt 21. The locking bolt 21 is rotatably screwed on the drive shaft tube 12. The inner end of the locking bolt 21 contacts and presses against the rear output shaft of the motor 9; it further includes a keyway 22. A keyway 22 is provided on the outer wall of the rear output shaft of the motor 9. The keyway 22 is parallel to the axis of the rear output shaft of the motor 9.

[0027] During operation, adjust the position of the rotating shaft 18 in the long sliding groove of the swing arm 16, and tighten the nut 19 to lock the rotating shaft 18 on the swing arm 16, thereby adjusting the lifting stroke of the stirring shaft 4. Further increase the distance between the rotating shaft 18 and the inner end of the swing arm 16, so that when the stirring shaft 4 rises, the piston 5 can be lifted out of the discharge pipe 2 and the spiral blade 6 can be retained in the discharge pipe 2, realizing the adjustment of the lifting stroke of the stirring shaft 4. Extend and retract the transmission shaft tube 12 along the rear output shaft of the motor 9, so that the sun gear 13 meshes with multiple planetary gears of the planetary gear disc 14 or the sun gear 13 is inserted into the spline hole of the insertion block 20. Tighten the locking bolt 21, and the inner end of the locking bolt 21 extends into the key groove 22. The key groove 22 limits the inner end of the locking bolt 21, so that the locking bolt 21 presses against the rear output shaft of the motor 9, locking the transmission shaft tube 12 and the rear output shaft of the motor 9. The output shaft of the motor 9 drives the transmission shaft tube 12 and the sun gear 13 to rotate. The sun gear 13 meshes with multiple planetary gears of the planetary gear disc 14 to rotate, and the multiple planetary gears mesh with the tooth ring of the housing 15, thereby driving the planetary gear disc 14 in the housing 15. The planetary gear disc 14 drives the swing arm 16 to rotate, realizing the deceleration effect of the output shaft of the motor 9. The swing arm 16 pulls the mounting plate 7 to lift and lower along multiple sliding rods 8 in the reverse direction through the pull rod 17, so that the mounting plate 7 drives the stirring shaft 4 to reciprocate up and down, enabling the multiple stirring rods of the stirring shaft 4 to stir up and down when rotating. After the sun gear 13 is inserted into the spline hole of the insertion block 20, the sun gear 13 directly drives the insertion block 20 and the swing arm 16 to rotate, realizing two-speed transmission of the swing arm 16 rotation, thereby realizing different lifting and stirring effects.

[0028] As Figures 1 to 6As shown in the figure, for a magnesium sulfate heptahydrate crystallization kettle of the present utility model, during operation, first, the stirring shaft 4 descends so that the piston 5 is inserted into the discharge pipe 2, causing the piston 5 to block the input port of the discharge pipe 2. Adjust the relative position of the rotating shaft 18 and the swing arm 16 and lock it with the nut 19, so that the piston 5 will not be pulled out of the discharge pipe 2 when the stirring shaft 4 reciprocates up and down. The crystallization agent and the solution are filled into the crystallization chamber of the kettle body 1 through the feed pipe 3. Then, the motor 9 operates to drive the stirring shaft 4 to rotate through the first bevel gear 10 and the second bevel gear 11. At the same time, the motor 9 drives the drive shaft tube 12 to rotate, and after deceleration by the sun gear 13, the planetary gear disc 14, the housing 15 and the inserted block 20, it drives the swing arm 16 to rotate. The swing arm 16 pulls the mounting plate 7 to reciprocate up and down along the plurality of sliding rods 8 through the pull rod 17. The rotation of the stirring shaft 4 drives the plurality of stirring rods to rotate and lift simultaneously to stir the agent and the solution, accelerating crystallization. Then, after crystallization is completed, the mounting plate 7 drives the stirring shaft 4 to rise, causing the stirring shaft 4 to pull the piston 5 out of the input port of the discharge pipe 2, and the lower part of the spiral blade 6 remains in the discharge pipe 2, and the upper part of the spiral blade 6 extends into the bottom of the crystallization chamber of the kettle body 1, thereby opening the discharge pipe 2, enabling the crystals together with the solution to be discharged through the discharge pipe 2. Finally, the rotation of the stirring shaft 4 drives the spiral blade 6 to rotate, and the spiral blade 6 accelerates the discharge of the crystals through the discharge pipe 2.

[0029] The main functions achieved by the present utility model are:

[0030] 1. When crystallizing, the piston 5 blocks the input port of the discharge pipe 2, avoiding blockage of the discharge pipe 2 and uneven mixing of the agent during discharging, with good reliability;

[0031] 2. It can stir up and down while rotating, improving the stirring efficiency;

[0032] 3. It can adjust the lifting stroke of the stirring shaft 4;

[0033] 4. It has two-stage deceleration, and the stirring effect is better.

[0034] For a magnesium sulfate heptahydrate crystallization kettle of the present utility model, its installation method, connection method or setting method are all common mechanical methods, and any method that can achieve its beneficial effects can be implemented; the kettle body 1, the discharge pipe 2, the feed pipe 3, the stirring shaft 4, the piston 5, the spiral blade 6, the mounting plate 7, the sliding rod 8, the motor 9, the first bevel gear 10, the second bevel gear 11, the drive shaft tube 12, the sun gear 13, the planetary gear disc 14, the housing 15, the swing arm 16, the rotating shaft 18, the nut 19, the inserted block 20, and the locking bolt 21 of the magnesium sulfate heptahydrate crystallization kettle of the present utility model are purchased on the market. Technical personnel in this industry only need to install and operate according to the attached user manual, without the need for creative labor from technical personnel in this field.

[0035] All the technical and scientific terms used in this document have the same meanings as those commonly understood by those skilled in the technical field to which this utility model belongs. The terms used in the specification of this utility model herein are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0036] The above are only the preferred embodiments of this utility model. It should be noted that for those of ordinary skill in the technical field, without departing from the technical principle of this utility model, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of this utility model.

Claims

1. A magnesium sulfate heptahydrate crystallization kettle, comprising a kettle body (1), a discharge pipe (2) and a feed pipe (3), wherein a crystallization chamber is arranged inside the kettle body (1), a discharge pipe (2) is arranged at the bottom of the kettle body (1), and a feed pipe (3) is arranged at the top of the kettle body (1), and both the discharge pipe (2) and the feed pipe (3) are connected to the crystallization chamber of the kettle body (1); characterized in that The invention also comprises a stirring shaft (4), a piston (5), a spiral blade (6), a mounting plate (7) and a plurality of sliding rods (8); the upper part of the stirring shaft (4) is movably connected to the top of the kettle body (1); the lower part of the stirring shaft (4) extends into the crystallization chamber of the kettle body (1); a plurality of stirring rods are arranged at the lower part of the stirring shaft (4); a piston (5) is arranged at the lower end of the stirring shaft (4); the piston (5) is slidably inserted into the discharge pipe (2); a spiral blade (6) is arranged at the lower end of the piston (5); the spiral blade (6) is located in the discharge pipe (2); the upper end of the stirring shaft (4) is rotatably connected to the mounting plate (7); a plurality of sliding rods (8) are vertically mounted on the top of the kettle body (1); and the plurality of sliding rods (8) are slidably limitedly connected to the mounting plate (7).

2. A magnesium sulfate heptahydrate crystallization kettle as claimed in claim 1, characterized in that, The invention also comprises a motor (9), a bevel gear 1 (10) and a bevel gear 2 (11), wherein the motor (9) is mounted on a mounting plate (7), the bevel gear 1 (10) is coaxially mounted on the front output shaft of the motor (9), the bevel gear 2 (11) is coaxially mounted on the upper end of the stirring shaft (4), and the bevel gear 2 (11) is meshed with the bevel gear 1 (10).

3. A magnesium sulfate heptahydrate crystallization kettle as claimed in claim 2, characterized in that, It also includes a transmission shaft tube (12), a sun gear (13), a planetary wheel disc (14), a housing (15), a swing arm (16) and a pull rod (17). The front end of the transmission shaft tube (12) is connected to the rear output shaft of the motor (9) in a transmission manner. The rear end of the transmission shaft tube (12) is concentrically mounted with the sun gear (13). A plurality of planetary gears are rotatably arranged on the front end surface of the planetary wheel disc (14). The sun gear (13) is meshed with the plurality of planetary gears simultaneously. The housing (15) is mounted on a mounting plate (7). A gear ring is arranged on the inner wall of the housing (15). The plurality of planetary gears of the planetary wheel disc (14) are meshed with the gear ring of the housing (15). The rear end surface of the planetary wheel disc (14) is connected to the piston (5) in a rotation manner. The inner end of the swing arm (16) is connected to the center of the rear end surface of the planetary wheel disc (14) in a transmission manner. The upper end of the pull rod (17) is connected to the swing arm (16) in a rotation manner. The lower end of the pull rod (17) is connected to the top of the kettle body (1).

4. A magnesium sulfate heptahydrate crystallization kettle as claimed in claim 3, characterized in that, It also includes a rotating shaft (18) and a nut (19). A long sliding groove is arranged on the swing arm (16). The rotating shaft (18) is slidably inserted into the long sliding groove of the swing arm (16). The nut (19) locks the rotating shaft (18) on the swing arm (16). The rotating shaft (18) is rotatably connected to the upper end of the pull rod (17).

5. A magnesium sulfate heptahydrate crystallization kettle as claimed in claim 3, characterized in that, It also includes a plug-in block (20), the transmission shaft tube (12) is plug-in transmission connected with the rear output shaft of the motor (9), the plug-in block (20) is coaxially mounted on the rear end face of the planetary wheel disc (14), a spline hole is arranged on the end face center of the plug-in block (20) facing the sun gear (13), the spline hole matches the sun gear (13), and the inner end of the swing arm (16) is concentrically connected with the rear end face of the plug-in block (20).

6. A magnesium sulfate heptahydrate crystallization kettle as claimed in claim 3, characterized in that, It also comprises a locking bolt (21), which is rotatably threaded on the transmission shaft tube (12), and the inner end of the locking bolt (21) is in contact with and pressed against the rear output shaft of the motor (9).

7. A magnesium sulfate heptahydrate crystallization kettle as claimed in claim 6, characterized in that, It also includes a keyway (22), which is arranged on the outer wall of the rear output shaft of the motor (9), and the keyway (22) is parallel to the axis of the rear output shaft of the motor (9).

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