Side-entering type stirring machine

The side-entry mixer enables efficient shaft seal replacement without hoisting, addressing labor-intensive issues in existing agitators by using a flange, driving structure, and adjustment mechanism, ensuring stable operation and improved servo motor longevity.

CN222219407UActive Publication Date: 2024-12-24ZHEJIANG KUNBO MIXING EQUIP CO LTD
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Patent Information

Application Number
CN202420243794.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-02-01
Publication Date
2024-12-24
Estimated Expiration
2034-02-01

AI Technical Summary

Technical Problem

The mechanical seal in existing side-entry agitators requires frequent replacement, which is time-consuming and labor-intensive, disrupting production efficiency due to the need for manual disassembly and hoisting equipment.

Method used

A side-entry mixer design that allows the mechanical seal to be replaced without hoisting, featuring a flange, driving structure, stirring shaft, shaft seal, and symmetrically arranged adjustment structure to move the stirring shaft and driving structure outward, along with a sealing structure to prevent material leakage during replacement.

Benefits of technology

Facilitates efficient and stable replacement of the shaft seal without interrupting production, enhancing maintenance efficiency and ensuring stable operation by supporting the driving structure during replacement, while also improving the service life of the servo motor through heat dissipation.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model belongs to the technical field of stirring equipment, and particularly relates to a side-in type stirring machine, which comprises a flange, a side-in type stirring shaft, a side-in type stirring shaft and a side-in type stirring shaft, the driving structure is arranged on the outer side of the equipment, and a fixing frame is arranged between the driving structure and the flange; the stirring shaft penetrates through the outer wall of the equipment and extends to the inner side of the equipment, a stirring part is arranged at the tail end of the stirring shaft, and an output shaft of the driving structure is connected with the starting end of the stirring shaft; the stirring shaft is sleeved with the shaft seal, the shaft seal is connected with the outer wall of the equipment through screws, and the shaft seal is partially embedded in the outer wall of the equipment; the adjusting structures are symmetrically arranged on the two sides of the flange, are connected with the stirring shaft and are used for enabling the stirring shaft and the driving structure to move towards the outer side of the equipment together. The effects that hoisting equipment is not needed for hoisting when the mechanical sealing element is replaced, and the efficiency of replacing the mechanical sealing element is improved are achieved.
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Description

Technical Field

[0001] The utility model belongs to the technical field of stirring equipment, in particular to a side-entry stirring machine. Background Art

[0002] Side-entry agitator is an agitator that installs the stirring device on the side wall of the equipment barrel. The corresponding agitator is selected according to the physical properties, capacity and stirring purpose of different media. Side-entry agitators are widely used in desulfurization, denitrification and stirring of various large storage tanks or storage tanks. Especially in large storage tanks or storage tanks, one or more agitators are used together to obtain good stirring effect with low energy consumption.

[0003] A mechanical seal is provided between the existing side-entry agitator and the equipment barrel to prevent leakage of materials in the equipment tank and waste of materials. However, the mechanical seal needs to be replaced regularly. The traditional method is to move the side-entry agitator horizontally through lifting equipment and manual methods, separate the mechanical seal from the equipment shell and then disassemble it. This is not only time-consuming and labor-intensive, but also affects production efficiency. Utility Model Content

[0004] The purpose of the utility model is to provide a side-entry mixer in view of the above-mentioned technical problems, so as to achieve the effect that the mechanical seal provided on the side-entry mixer can be replaced without hoisting the side-entry mixer through hoisting equipment.

[0005] In view of this, the utility model provides a side-entry mixer, characterized in that it includes:

[0006] A flange, wherein the flange is fixed at a corresponding position of an outer wall of the device by screws;

[0007] A driving structure, wherein the driving structure is arranged outside the equipment and a fixing frame is arranged between the driving structure and the flange;

[0008] A stirring shaft, the stirring shaft passes through the outer wall of the device and extends to the inner side of the device, and a stirring part is provided at the end of the stirring shaft, and the output shaft of the driving structure is connected to the starting end of the stirring shaft;

[0009] A shaft seal, wherein the shaft seal sleeve is arranged on the stirring shaft, connected to the outer wall of the equipment by screws, and partially embedded in the outer wall of the equipment;

[0010] The adjusting structure is symmetrically arranged on both sides of the flange and connected to the stirring shaft, so as to enable the stirring shaft and the driving structure to move toward the outside of the equipment together.

[0011] In the present technical solution, the driving structure can drive the stirring shaft to rotate and stir the materials in the equipment. When the shaft seal needs to be replaced, the screws provided on the flange and the shaft seal for connecting the outer wall of the equipment are removed. The symmetrically arranged adjustment structure can move the stirring shaft and the driving structure outward together, so that the shaft seal can be pulled out from the outer wall of the equipment, so that maintenance personnel can replace the shaft seal. The symmetrically arranged adjustment structure is fixedly connected to the outer wall of the equipment, and the adjustment structure is connected to the stirring shaft, so that when the shaft seal is replaced, the adjustment structure can support the driving structure, and the shaft seal provided on the side-entry agitator can be replaced without the need to hoist the side-entry agitator through hoisting equipment.

[0012] In the above technical solution, further, the regulating structure includes:

[0013] A support frame, wherein the support frame is symmetrically arranged on both sides of the flange, and the support frame is fixedly connected to the outer wall of the equipment;

[0014] A fixed block, the fixed block is arranged on the outer wall of the support frame, and an adjusting screw rod is rotatably arranged on the fixed block, and a rotating handle is arranged on the top of the adjusting screw rod;

[0015] A movable groove, wherein the movable groove is arranged on the support frame, and an adjustment plate is slidably arranged in the movable groove, and both ends of the adjustment plate are threadedly connected to the adjustment screw rod;

[0016] A limiting groove, wherein the limiting groove is arranged on the side of the adjusting plate, and a fixing ring is arranged in the limiting groove, and the adjusting plate and the fixing ring are connected by screws;

[0017] The sealing structure is sleeved on the stirring shaft and located inside the equipment.

[0018] In this technical solution, when the shaft seal needs to be replaced, the adjusting plate can be moved along the moving groove by turning the rotating handle at the top of the screw rod, and the adjusting plate and the fixing ring are fixed by screws. When the adjusting plate moves outward, the stirring shaft and the driving structure can be driven to move outward together, so that the shaft seal is separated from the outer wall of the equipment, which is conducive to improving the replacement efficiency of the shaft seal. When the driving structure drives the stirring shaft to work, the screws between the adjusting plate and the fixing ring can be removed to ensure the stable operation of the equipment.

[0019] In the above technical solution, further, the sealing structure includes:

[0020] A sleeve, wherein the sleeve is fixedly arranged on the inner wall of the device and is located at the through hole between the stirring shaft and the device;

[0021] A sealing block, which is sleeved on the stirring shaft and slidably arranged in the sleeve;

[0022] A limiting ring is arranged on the end surface of the sleeve to limit the movement of the sealing block.

[0023] In the present technical solution, when the agitator shaft moves outward, the cooperation between the provided sealing block and the sleeve can prevent the material from flowing out of the through hole between the agitator shaft and the equipment when the shaft seal is replaced, which is beneficial to improving the stability of the device.

[0024] In the above technical solution, further, the fixing rings are arranged in a split type, and the fixing rings are connected by screws.

[0025] In the above technical solution, further, the driving structure includes:

[0026] A drive box, wherein the interior of the drive box is divided into an upper chamber and a lower chamber, and a servo motor is fixedly arranged in the upper chamber;

[0027] A connecting rod, the connecting rod is rotatably arranged in the lower chamber, and pulleys are arranged on the connecting rod and the output shaft of the servo motor;

[0028] A conveyor belt, which is sleeved on two pulleys to transmit motion;

[0029] A heat dissipation structure, which is arranged in the drive box and connected to the top of the connecting rod;

[0030] Wherein, the other end of the connecting rod passes through the side wall of the driving box and is connected to the stirring shaft.

[0031] In the present technical solution, the cooperation between the servo motor, the pulley and the connecting rod can drive the stirring shaft to rotate, so that it can stir the material in the equipment. By setting the servo motor in the drive box and providing a heat dissipation structure, the service life of the servo motor can be improved.

[0032] In the above technical solution, further, the heat dissipation structure includes:

[0033] An air inlet, the air inlet is arranged on the side of the upper chamber, and a filter is arranged at the air inlet;

[0034] The fan blades are arranged at the top of the connecting rod, and the lower cavity is provided with an air outlet at a position opposite to the fan blades;

[0035] The connecting groove is arranged between the upper chamber and the lower chamber to connect the two chambers.

[0036] In this technical solution, through the cooperation between the servo motor, the pulley and the conveyor belt, the connecting rod and the fan blades on the end face of the connecting rod can be driven to rotate. The rotating fan blades can accelerate the air circulation inside the drive box, which is beneficial to improving the heat dissipation efficiency of the servo motor.

[0037] In the above technical solution, further, the filter screen is connected to the air inlet by screws.

[0038] In the present technical solution, the screw connection enables maintenance personnel to easily replace or disassemble the filter for cleaning, which is beneficial to improving the heat dissipation efficiency of the servo motor.

[0039] The beneficial effects of the utility model are:

[0040] 1. The symmetrically arranged adjustment structure enables the agitator shaft and the drive structure to move outward together, so that the shaft seal can be pulled out from the outer wall of the equipment, so that maintenance personnel can replace the shaft seal. The symmetrically arranged adjustment structure is fixedly connected to the outer wall of the equipment, and the adjustment structure is connected to the agitator shaft, so that when the shaft seal is replaced, the adjustment structure can support the drive structure, and the shaft seal installed on the side-entry agitator can be replaced without the need to hoist the side-entry agitator through hoisting equipment.

[0041] 2. The cooperation among the servo motor, the pulley and the connecting rod can drive the stirring shaft to rotate, so that it can stir the materials in the equipment. By setting the servo motor in the drive box and providing a heat dissipation structure, it is beneficial to improve the service life of the servo motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0043] Figure 2 It is a cross-sectional view of the utility model;

[0044] Figure 3 This utility model Figure 1 A magnified image of the middle A area;

[0045] Figure 4 This utility model Figure 2 Enlarged view of area B;

[0046] Figure 5 It is a three-dimensional cross-sectional view of the driving structure of the utility model;

[0047] The symbols in the figure are:

[0048] 1. Flange; 2. Driving structure; 201. Driving box; 202. Servo motor; 203. Upper chamber; 204. Lower chamber; 305. Pulley; 206. Conveyor belt; 207. Connecting rod; 3. Stirring shaft; 4. Fixed frame; 5. Stirring part; 6. Shaft seal; 7. Adjusting structure; 701. Support frame; 702. Fixed block; 703. Adjusting screw rod; 704. Turning handle; 705. Moving groove; 706. Limiting groove; 707. Fixed ring; 708. Adjusting plate; 8. Sealing structure; 801. Sleeve; 802. Sealing block; 803. Limiting ring; 9. Heat dissipation structure; 901. Air inlet; 902. Filter; 903. Connecting groove; 904. Fan blade; 905. Air outlet. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0050] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0051] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0052] It should be noted that, in the description of the present application, the orientation or positional relationship indicated by terms such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these orientation words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application; the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

[0053] It should be noted that, in the present application, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be noted that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0054] Embodiment 1:

[0055] Depend on Figure 1-Figure 4 As shown, this embodiment provides a side-entry mixer, including: a flange 1, which is fixedly arranged at a corresponding position on the outer wall of the equipment by screws; a driving structure 2, which is arranged on the outside of the equipment, and a fixing frame 4 is arranged between the driving structure 2 and the flange 1; a stirring shaft 3, which passes through the outer wall of the equipment and extends to the inner side of the equipment, and a stirring part 5 is arranged at the end of the stirring shaft 3, and the output shaft of the driving structure 2 is connected to the starting end of the stirring shaft 3; a shaft seal 6, which is sleeved on the stirring shaft 3, connected to the outer wall of the equipment by screws, and partially embedded in the outer wall of the equipment; an adjusting structure 7, which is symmetrically arranged on both sides of the flange 1 and connected to the stirring shaft 3, so as to move the stirring shaft 3 and the driving structure 2 to the outside of the equipment together.

[0056] The driving structure 2 can drive the stirring shaft 3 to rotate and stir the materials in the equipment. When the shaft seal 6 needs to be replaced, the screws for connecting the flange 1 and the shaft seal 6 to the outer wall of the equipment are removed, and the stirring shaft 3 and the driving structure 2 can be moved outward together through the symmetrically arranged adjustment structure 7, so that the shaft seal 6 can be pulled out from the outer wall of the equipment, so that the maintenance personnel can replace the shaft seal 6. The symmetrically arranged adjustment structure 7 is fixedly connected to the outer wall of the equipment, and the adjustment structure 7 is connected to the stirring shaft 3, so that when the shaft seal 6 is replaced, the driving structure 2 can be supported by the adjustment structure 7, and the shaft seal 6 set on the side-entry agitator can be replaced without hoisting the side-entry agitator through hoisting equipment.

[0057] The adjustment structure 7 includes: a support frame 701, which is symmetrically arranged on both sides of the flange 1, and the support frame 701 is fixedly connected to the outer wall of the equipment; a fixed block 702, which is arranged on the outer wall of the support frame 701, and an adjusting screw 703 is rotatably arranged on the fixed block 702, and a rotating handle 704 is arranged on the top of the adjusting screw 703; a movable groove 705, which is arranged on the support frame 701, and an adjustment plate 708 is slidably arranged in the movable groove 705, and both ends of the adjustment plate 708 are threadedly connected to the adjusting screw 703; a limiting groove 706, which is arranged on the side of the adjustment plate 708, and a fixing ring 707 is arranged in the limiting groove 706, and the adjustment plate 708 and the fixing ring 707 are connected by screws; a sealing structure 8, which is sleeved on the stirring shaft 3 and located inside the equipment.

[0058] When the shaft seal 6 needs to be replaced, the rotating handle 704 at the top of the screw rod is rotated to move the adjustment plate 708 along the moving groove 705, and the adjustment plate 708 is fixed to the fixing ring 707 by screws. When the adjustment plate 708 moves outward, the stirring shaft 3 and the driving structure 2 can be driven to move outward together, so that the shaft seal 6 is separated from the outer wall of the equipment, which is conducive to improving the replacement efficiency of the shaft seal 6. When the driving structure 2 drives the stirring shaft 3 to work, the screws between the adjustment plate 708 and the fixing ring 707 can be removed to ensure the stable operation of the equipment.

[0059] Embodiment 2:

[0060] Depend on Figure 1-Figure 4 As shown, this embodiment provides a side-entry mixer, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0061] The sealing structure 8 includes: a sleeve 801, which is fixedly arranged on the inner wall of the device and is located at the through hole between the stirring shaft 3 and the device; a sealing block 802, which is sleeved on the stirring shaft 3 and slidably arranged in the sleeve 801; and a limiting ring 803, which is arranged on the end face of the sleeve 801 to limit the movement of the sealing block 802.

[0062] When the stirring shaft 3 moves outward, the cooperation between the sealing block 802 and the sleeve 801 can prevent the material from flowing out of the through hole between the stirring shaft 3 and the equipment when the shaft seal 6 is replaced, which is beneficial to improving the stability of the device.

[0063] The fixing ring 707 is a split type arrangement, and the fixing rings 707 are connected by screws. The split type fixing ring 707 can be conveniently matched to the limiting groove 706.

[0064] Embodiment 3:

[0065] Depend on Figure 1-Figure 5 As shown, this embodiment provides a side-entry mixer, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0066] The driving structure 2 includes: a driving box 201, the interior of the driving box 201 is divided into an upper chamber 203 and a lower chamber 204, and a servo motor 202 is fixedly installed in the upper chamber 203; a connecting rod 207, the connecting rod 207 is rotatably set in the lower chamber 204, and pulleys 305 are set on the connecting rod 207 and the output shaft of the servo motor 202; a conveyor belt 206, the conveyor belt 206 is sleeved on two pulleys 305 to transmit motion; a heat dissipation structure 9, the heat dissipation structure 9 is set in the driving box 201, and is connected to the top of the connecting rod 207; wherein the other end of the connecting rod 207 passes through the side wall of the driving box 201 and is connected to the stirring shaft 3.

[0067] The cooperation among the servo motor 202, the pulley 305 and the connecting rod 207 can drive the stirring shaft 3 to rotate, so that it can stir the material in the equipment. By setting the servo motor 202 in the drive box 201 and providing a heat dissipation structure 9, it is beneficial to improve the service life of the servo motor 202.

[0068] The heat dissipation structure 9 includes: an air inlet 901, which is arranged on the side of the upper chamber 203, and a filter 902 is arranged at the air inlet 901; a fan blade 904, which is arranged at the top of the connecting rod 207, and an air outlet 905 is opened in the lower cavity opposite to it; a connecting groove 903, which is arranged between the upper chamber 203 and the lower chamber 204, for connecting the upper and lower chambers.

[0069] Through the cooperation between the servo motor 202, the pulley 305, and the conveyor belt 206, the connecting rod 207 and the fan blades 904 on the end face of the connecting rod 207 can be driven to rotate. The rotating fan blades 904 can accelerate the air circulation inside the drive box 201, which is beneficial to improving the heat dissipation efficiency of the servo motor 202.

[0070] The filter 902 is connected to the air inlet 901 by screws. The screw connection makes it easy for maintenance personnel to replace or remove the filter 902 for cleaning, which is beneficial to improving the efficiency of heat dissipation of the servo motor 202.

[0071] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A side-entry mixer, characterized in that ,include: A flange (1), wherein the flange (1) is fixed at a corresponding position on an outer wall of the device by means of screws; A driving structure (2), wherein the driving structure (2) is arranged outside the device and a fixing frame (4) is arranged between the driving structure (2) and the flange (1); A stirring shaft (3), the stirring shaft (3) passes through the outer wall of the device and extends to the inner side of the device, and a stirring portion (5) is provided at the end of the stirring shaft (3), and the output shaft of the driving structure (2) is connected to the starting end of the stirring shaft (3); A shaft seal (6), wherein the shaft seal (6) is sleeved on the stirring shaft (3), connected to the outer wall of the device by screws, and partially embedded in the outer wall of the device; An adjusting structure (7), wherein the adjusting structure (7) is symmetrically arranged on both sides of the flange (1) and connected to the stirring shaft (3), so as to enable the stirring shaft (3) and the driving structure (2) to move toward the outside of the device together; The driving structure (2) comprises: A drive box (201), wherein the interior of the drive box (201) is divided into an upper chamber (203) and a lower chamber (204), and a servo motor (202) is fixedly arranged in the upper chamber (203); A connecting rod (207), the connecting rod (207) being rotatably disposed in the lower chamber (204), and a pulley (305) being disposed on both the connecting rod (207) and the output shaft of the servo motor (202); A conveyor belt (206), wherein the conveyor belt (206) is sleeved on two pulleys (305) for transmitting motion; A heat dissipation structure (9), wherein the heat dissipation structure (9) is arranged in the drive box (201) and connected to the top of the connecting rod (207); The other end of the connecting rod (207) passes through the side wall of the driving box (201) and is connected to the stirring shaft (3).

2. A side-entry mixer according to claim 1, characterized in that: The regulating structure (7) comprises: A support frame (701), wherein the support frame (701) is symmetrically arranged on both sides of the flange (1), and the support frame (701) is fixedly connected to the outer wall of the device; A fixed block (702), the fixed block (702) being arranged on the outer wall of the support frame (701), and an adjusting screw rod (703) being rotatably arranged on the fixed block (702), and a rotating handle (704) being arranged at the top end of the adjusting screw rod (703); A movable groove (705), wherein the movable groove (705) is arranged on the support frame (701), and an adjustment plate (708) is slidably arranged in the movable groove (705), and both ends of the adjustment plate (708) are threadedly connected to the adjustment screw rod (703); A limiting groove (706), wherein the limiting groove (706) is arranged on the side of the adjusting plate (708), and a fixing ring (707) is arranged in the limiting groove (706), and the adjusting plate (708) and the fixing ring (707) are connected by screws; A sealing structure (8), wherein the sealing structure (8) is sleeved on the stirring shaft (3) and is located inside the equipment.

3. A side-entry mixer according to claim 2, characterized in that: The sealing structure (8) comprises: A sleeve (801), wherein the sleeve (801) is fixedly arranged on the inner wall of the device and is located at a through hole between the stirring shaft (3) and the device; A sealing block (802), wherein the sealing block (802) is sleeved on the stirring shaft (3) and slidably disposed in the sleeve (801); A limiting ring (803) is arranged on the end surface of the sleeve (801) to limit the movement of the sealing block (802).

4. A side-entry mixer according to claim 2, characterized in that: The fixing rings (707) are arranged in a split type, and the fixing rings (707) are connected by screws.

5. A side-entry mixer according to claim 1, characterized in that: The heat dissipation structure (9) comprises: An air inlet (901), the air inlet (901) being arranged on a side of the upper chamber (203), and a filter screen (902) being arranged at the air inlet (901); The fan blade (904) is arranged at the top of the connecting rod (207), and the lower cavity is provided with an air outlet (905) at a position opposite to the fan blade (904); The connecting groove (903) is arranged between the upper chamber (203) and the lower chamber (204) to connect the upper and lower chambers.

6. A side-entry mixer according to claim 5, characterized in that: The filter screen (902) is connected to the air inlet (901) via screws.