Air-blowing sealing device for lifting stirring shaft and sealing method of air-blowing sealing device

Abstract

The invention relates to an air-blowing sealing device for a lifting stirring shaft and a sealing method of the air-blowing sealing device, and relates to the field of stirring equipment. The air-tight sealing cavity is formed in the periphery of the lifting shaft sleeve and located on the inner side of the vacuum cover, and the air-tight sealing cavity and the filler base are sealed through the first sealing ring; wherein the airtight sealing cavity is provided with a plurality of air pipe threaded connectors, the air pipe threaded connectors are communicated with the first end of a T-shaped threaded connector at the top of the vacuum cover, the second end of the T-shaped threaded connector is connected with the first end of the pressure regulating valve, the second end of the pressure regulating valve is connected with the pneumatic duplex piece, and the third end of the T-shaped threaded connector is connected with the pressure sensor. Under the condition, the problem that black impurities are generated after nanoscale powder enters a sealing gap for friction in the stirring process can be avoided, the quality of a final finished product material is guaranteed, and various stirring conditions such as vacuumizing and pressurizing protection in the kettle can be met by adjusting the pressure of the airtight sealing cavity in time.

Description

Technical Field

[0001] The invention relates to the technical field of stirring equipment, and in particular to an air blowing sealing device for a lifting stirring shaft and a sealing method thereof. Background Art

[0002] In industrial production, especially in the chemical, pharmaceutical, and food processing industries, mixing and dispersing materials is a critical process. The materials in these industries often have high viscosity. In order to ensure uniform mixing, specially designed lifting and mixing equipment is usually used to complete this task. The lifting and mixing equipment can achieve efficient mixing of materials through its unique structural design, and can also adapt to containers of different heights, thereby improving production flexibility.

[0003] However, in actual application, traditional lifting and mixing equipment faces some challenges. Among them, one of the most prominent problems is the lack of sealing performance. Among the existing lifting shaft sealing technologies, packing seal is the most common method. This sealing method is widely used due to its advantages such as simple structure, low cost and easy installation. However, it also has obvious disadvantages, especially when dealing with the stirring and dispersion of nano-scale powder particles.

[0004] When performing the stirring and dispersing process, it is often necessary to continuously add powder and liquid raw materials to the reactor. For those nano-sized powder particles with extremely small particle sizes, they are not only light in weight, but also easily affected by airflow and float inside the reactor. These tiny particles can easily enter the tiny gap between the filler and the lifting sleeve. With the continuous reciprocating motion during the stirring process, the filler will produce strong squeezing and friction effects on these stuck particles, which will not only accelerate the wear of the filler itself, but more importantly, this squeezing and friction process will cause the nanoparticles to change color and form black impurities. These impurities will fall off with the reciprocating motion of the spindle and eventually mix into the finished material, which seriously affects the purity and quality of the product. In some extreme cases, this contamination may even cause the entire batch of products to become waste, causing economic losses to the company.

[0005] Therefore, how to effectively solve the pollution problem caused by packing seals and improve the working efficiency and product quality of mixing equipment has become an important direction of current research. Summary of the invention

[0006] The purpose of the present invention is to provide an air blowing sealing device for a lifting stirring shaft and a sealing method thereof, so as to solve the problems existing in the above-mentioned prior art.

[0007] To achieve the above object, the technical solution adopted by the present invention is: In a first aspect, the present application provides an air blowing sealing device for a lifting stirring shaft, comprising: A lifting sleeve, the upper part of which is connected to the transmission box mounting bottom plate of the lifting mixing device, and the lower part of which is located in the vacuum cover; A stirring main shaft, which is rotatably arranged in the lifting sleeve through a bearing; A packing seat, which is sleeved on the outer periphery of the lifting sleeve and is located at the matching position between the lifting sleeve and the vacuum cover; The air blowing sealing device for the lifting stirring shaft also includes: An airtight cavity, which is sleeved on the outer periphery of the lifting sleeve and located on the inner side of the vacuum cover, and is sealed with the packing seat through a first sealing ring; Among them, the airtight cavity has multiple air pipe threaded interfaces, the air pipe threaded interface is connected to the first end of the T-shaped threaded joint on the top of the vacuum cover, the second end of the T-shaped threaded joint is connected to the first end of the pressure regulating valve, the second end of the pressure regulating valve is connected to the pneumatic two-piece, and the third end of the T-shaped threaded joint is connected to the pressure sensor.

[0008] In a possible implementation, oil seals are coaxially mounted on the inner upper end and the inner lower end of the airtight cavity, and the two oil seals are limited by a support ring.

[0009] In a possible implementation, the side wall of the support ring has evenly distributed waist-shaped holes.

[0010] In a possible implementation, an annular scraper is further sleeved on the outer circumference of the lifting sleeve, and the annular scraper is connected to the lower end of the airtight cavity.

[0011] In a possible implementation, the opening position of the trachea threaded interface is tangent to the inner circle of the airtight cavity.

[0012] In a possible implementation, the packing seat and the vacuum cover are sealed by a second sealing ring.

[0013] In a possible implementation, a bushing is coaxially provided between the packing seat and the lifting sleeve.

[0014] In a possible implementation, the filler is installed in the filler seat by winding a coil.

[0015] In a possible implementation, the packing gland is connected to the packing seat by means of studs and is tightened to compact the packing.

[0016] In a second aspect, the present application provides a sealing method for an air blowing sealing device for a lifting stirring shaft, the method being applied to any of the above-described air blowing sealing devices for a lifting stirring shaft, the air blowing sealing device for a lifting stirring shaft also including a controller, the method comprising: Set the initial pressure and flow rate of the air source of the stirring equipment. The air source is introduced into the pneumatic two-way joint in the form of compressed air. The initial pressure of the air source is 0.03MPa and the flow rate is 30L / min. In response to the stirring device starting to operate, detecting the air pressure in the airtight cavity by means of a pressure sensor; If the air pressure in the airtight cavity is lower than 0.02 MPa, the pressure sensor feeds back the pressure signal to the controller, and the controller controls the pressure regulating valve to adjust the air source pressure so that the pressure in the airtight cavity is maintained at 0.02 MPa; In response to the stirring kettle of the stirring device being vacuumed, the vacuum degree is set to -0.098 MPa, the gas source is cut off, and the pressure in the gas-sealed cavity is always maintained at 0.02 MPa through the sealing of the packing in the packing seat, the sealing between the packing seat and the vacuum cover through the second sealing ring, the sealing of the inner upper end and the lower end of the gas-sealed cavity through the oil seal, and the sealing of the gas-sealed cavity and the packing seat through the first sealing ring; In response to the vacuum being broken in the stirring kettle of the stirring equipment, the air source is connected, compressed air is introduced into the pneumatic coupler, the pressure sensor feeds back the pressure signal to the controller, and the controller controls the pressure regulating valve to adjust the air source pressure so that the pressure in the airtight cavity is maintained at 0.02MPa.

[0017] The beneficial effects brought about by the technical solution provided by the present invention include at least: The present invention sets an airtight cavity on the periphery of the lifting sleeve and on the inner side of the vacuum cover, and the airtight cavity is sealed with the packing seat through a first sealing ring; wherein, the airtight cavity has a plurality of air pipe threaded interfaces, the air pipe threaded interfaces are connected to the first end of the T-threaded joint at the top of the vacuum cover, the second end of the T-threaded joint is connected to the first end of the pressure regulating valve, the second end of the pressure regulating valve is connected to the pneumatic two-piece, and the third end of the T-threaded joint is connected to the pressure sensor. In this case, the problem of black impurities generated after the nano-powder mixing process enters the sealing gap and rubs can be avoided, the quality of the final finished material is guaranteed, and the pressure of the airtight cavity can be adjusted in time to meet various mixing conditions such as vacuuming and pressurization protection in the kettle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0019] Figure 1 A schematic structural diagram of an air blowing sealing device for a lifting stirring shaft provided by an exemplary embodiment of the present invention is shown.

[0020] Figure 2 Shows Figure 1 A local enlarged schematic diagram of point A.

[0021] Figure 3 A schematic structural diagram of a support ring of an air blowing sealing device for a lifting stirring shaft provided by an exemplary embodiment of the present invention is shown.

[0022] Figure 4 A schematic structural diagram of an annular scraper of an air blowing sealing device for a lifting stirring shaft provided by an exemplary embodiment of the present invention is shown.

[0023] Figure 5 A schematic diagram of the air circuit connection of an air blowing sealing device for a lifting stirring shaft provided by an exemplary embodiment of the present invention is shown.

[0024] Figure 6 A schematic diagram showing the position of openings in an air-sealing cavity of an air-blowing sealing device for a lifting stirring shaft provided by an exemplary embodiment of the present invention is shown.

[0025] Figure 7 A connection diagram of a controller of an air blowing sealing device for a lifting stirring shaft provided by an exemplary embodiment of the present invention is shown.

[0026] In the figure: 1. lifting sleeve; 2. vacuum cover; 3. stirring main shaft; 4. packing seat; 5. air sealing cavity; 6. first sealing ring; 7. air pipe threaded interface; 8. T-type threaded joint; 9. pneumatic two-piece; 10. pressure sensor; 11. oil seal; 12. support ring; 13. annular scraper; 14. second sealing ring; 15. bushing; 16. packing; 17. packing gland; 18. pressure regulating valve. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Among them, the same parts are represented by the same figure marks. It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings of the specification of the present invention, and the words "bottom surface" and "top surface", "inside" and "outside" refer to the direction towards or away from a specific component, respectively. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the specification of the present invention, the meaning of "multiple" is two or more.

[0029] First, the terms involved in the embodiments of the present invention are briefly introduced: Pneumatic two-way fittings, also known as the FR part of the pneumatic filter-pressure reducing valve combination FRL, are one of the commonly used auxiliary components in pneumatic systems. It consists of two main components: filter and pressure reducing valve. The two work together to effectively purify compressed air and adjust its pressure to ensure the normal operation of subsequent pneumatic components.

[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0031] Figure 1 The structure diagram of the air blowing sealing device for the lifting stirring shaft provided by an exemplary embodiment of the present invention is shown. Figure 2 Shows Figure 1 A partial enlarged schematic diagram of the A position of the lifting stirring shaft. The air-blowing sealing device for the lifting stirring shaft comprises: a lifting sleeve 1, a stirring main shaft 3, a stuffing seat 4 and an air-sealing cavity 5. The upper part of the lifting sleeve 1 is connected to the transmission box mounting bottom plate of the lifting stirring device, and the lower part thereof is located in the vacuum cover 2; the stirring main shaft 3 is rotatably arranged in the lifting sleeve 1 through two upper and lower bearings; the stuffing seat 4 is sleeved on the outer periphery of the lifting sleeve 1 and is located at the matching position of the lifting sleeve 1 and the vacuum cover 2; the air-sealing cavity 5 is sleeved on the outer periphery of the lifting sleeve 1 and is located on the inner side of the vacuum cover 2, and the air-sealing cavity 5 is sealed with the stuffing seat 4 through a first sealing ring 6; wherein the air-sealing cavity 5 has a plurality of air pipe threaded interfaces 7, the air pipe threaded interfaces 7 are connected to the first end of the T-type threaded joint 8 on the top of the vacuum cover 2, the second end of the T-type threaded joint 8 is connected to the pneumatic two-piece 9, and the third end of the T-type threaded joint 8 is connected to the pressure sensor 10.

[0032] In the embodiment of the present application, a pressure regulating valve 18 is also connected between the second end of the T-type threaded connector 8 and the pneumatic coupler 9. The pressure regulating valve 18 can receive the pressure signal of the pressure sensor 10, and provide feedback according to the current working conditions to automatically adjust the pressure input of the intake air.

[0033] In the embodiment of the present application, the upper part of the lifting sleeve 1 is connected to the transmission box mounting base of the lifting and stirring equipment by bolts. The lifting sleeve 1 is the main body supporting the rotational movement of the stirring main shaft 3. The stirring main shaft 3 rotates under the drive of the motor, and the lifting sleeve 1 can reciprocate up and down through the hydraulic power system.

[0034] In the embodiment of the present application, the packing seat 4 is connected to the vacuum cover 2 by a hexagon socket bolt, and the packing seat 4 and the vacuum cover 2 are sealed by a second sealing ring 14. During the stirring operation of the equipment, the vacuum cover 2 is always hydraulically compressed. The second sealing ring 14 is used to play a double sealing role when the first sealing ring 6 fails.

[0035] In the embodiment of the present application, the pressure sensor 10 is used to monitor the real-time pressure of the entire airtight cavity 5, and the inlet side of the pneumatic coupler 9 is connected to the air source, which can be compressed air.

[0036] For more information, see Figure 2 , Figure 3 and Figure 4 The upper and lower ends of the inner side of the air-sealed cavity 5 are coaxially mounted with oil seals 11, and the two oil seals 11 are limited by a support ring 12. The outer periphery of the lifting sleeve 1 is also sleeved with an annular scraper 13, which is connected to the lower end of the air-sealed cavity 5 by bolts.

[0037] In the embodiment of the present application, oil seals 11 are coaxially installed at the upper and lower ends, and a good seal is formed between the upper and lower oil seals 11 and the lifting sleeve 1. The upper and lower oil seals 11 can effectively maintain a stable positive pressure environment in the air-sealed cavity 5. At the same time, the oil seals 11 can play a certain blocking role on the powder particles.

[0038] In the embodiment of the present application, the side wall of the support ring 12 has evenly distributed waist-shaped holes. The presence of the waist-shaped holes is conducive to the compressed air to quickly and evenly enter the airtight cavity 5, forming a relatively stable air pressure.

[0039] In the embodiment of the present application, the annular scraper 13 is installed at the lower end of the airtight cavity 5, and is coaxially assembled with the lifting sleeve 1 with a certain gap. The annular scraper 13 can effectively scrape off the material adhering to the surface of the lifting sleeve 1, has a certain cleaning effect on the surface of the lifting sleeve 1, and also ensures that the material adhering to the surface of the lifting sleeve 1 will not enter the airtight cavity 5. In one example, the material of the annular scraper 13 is polytetrafluoroethylene.

[0040] It can be understood that a closed positive pressure cavity - air-sealed cavity 5 is formed between the lifting sleeve 1 and the packing seat 4, and nanometer-scale powder particles will not exist in the gap of the seal, ensuring that no friction is generated.

[0041] In some embodiments, see Figure 5 and Figure 6 The airtight cavity 5 has three air pipe threaded interfaces 7; the opening positions of the air pipe threaded interfaces 7 are tangent to the inner circle of the airtight cavity 5. When the gas enters the airtight cavity 5, the disturbance of the gas flow caused by the sudden change of the gas flow channel can be reduced.

[0042] For further information, see Figure 2 A bushing 15 is coaxially provided between the packing seat 4 and the lifting sleeve 1. The packing seat 4 and the bushing 15 are tightly matched. When the lifting sleeve 1 reciprocates up and down, the bushing 15 can play a good guiding and self-lubricating role.

[0043] In one example, the bushing 15 is made of tin bronze.

[0044] Furthermore, the packing 16 is installed in the packing seat 4 by winding a circle, and the packing gland 17 is connected to the packing seat 4 by a stud and tightened to compact the packing 16 to achieve a sealing effect.

[0045] In the embodiment of the present application, after the equipment has been running for a long time, the studs on the packing gland 17 can be tightened and adjusted to ensure the sealing inside the vacuum cover 2.

[0046] It should be noted that Figure 7 A connection diagram of a controller of an air-blowing sealing device for a lifting stirring shaft provided by an exemplary embodiment of the present invention is shown. The air-blowing sealing device for a lifting stirring shaft also includes a controller for controlling the coordinated operation of a pneumatic coupler 9, a pressure sensor 10, and a pressure regulating valve 18.

[0047] In the embodiment of the present application, the controller is a programmable logic controller PLC or a programmable automation controller PAC.

[0048] Next, the sealing method of the air blowing sealing device for the lifting stirring shaft involved in the embodiment of the present invention is described.

[0049] When the stirring equipment is turned on, the air source switch remains on, and the initial air source pressure and flow rate of the stirring equipment are set. The air source is introduced into the pneumatic two-way joint in the form of compressed air. The initial air source pressure is 0.03MPa and the flow rate is 30L / min. In response to the stirring device starting to operate, the air pressure in the airtight cavity is detected by the pressure sensor; If the air pressure in the airtight cavity is lower than 0.02MPa, the pressure sensor feeds back the pressure signal to the controller, and the controller controls the pressure regulating valve to adjust the air source pressure so that the pressure in the airtight cavity is maintained at 0.02MPa; In response to the stirring kettle of the stirring device being vacuumed, the vacuum degree is set to -0.098MPa, the gas source is cut off, and the pressure in the gas-sealed cavity is always maintained at 0.02MPa through the sealing of the packing in the packing seat, the sealing between the packing seat and the vacuum cover through the second sealing ring, the sealing of the inner upper end and the lower end of the gas-sealed cavity through the oil seal, and the sealing of the gas-sealed cavity and the packing seat through the first sealing ring; In response to the vacuum breaking in the stirring kettle of the stirring equipment, the air source is connected, compressed air is introduced into the pneumatic two-way fitting, and the pressure sensor feeds back the pressure signal to the controller. The controller controls the pressure regulating valve to adjust the air source pressure to maintain the pressure in the air-sealed cavity at 0.02MPa.

[0050] During the entire operation of the mixing equipment, the controller of the equipment keeps a slight positive pressure in the airtight chamber at all times, which can avoid the problem of black impurities generated by the friction of nano-powders entering the sealing gap during the mixing process, thereby ensuring the quality of the final product. The pressure of the airtight chamber can be adjusted in time to meet various mixing conditions such as vacuuming and pressurizing protection in the kettle.

[0051] In the embodiments disclosed in the present invention, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments disclosed in the present invention can be understood according to specific circumstances.

[0052] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An air-blowing sealing device for a lifting stirring shaft, include: A lifting sleeve (1), the upper portion of which is connected to a transmission box mounting base plate of the lifting stirring device, and the lower portion of which is located in a vacuum cover (2); A stirring main shaft (3), which is rotatably arranged in the lifting sleeve (1) via a bearing; A packing seat (4), which is sleeved on the outer circumference of the lifting sleeve (1) and is located at the matching position between the lifting sleeve (1) and the vacuum cover (2); Characterized in that, the air blowing sealing device for the lifting stirring shaft further comprises: An airtight cavity (5) which is sleeved on the outer periphery of the lifting sleeve (1) and is located on the inner side of the vacuum cover (2), and is sealed with the packing seat (4) via a first sealing ring (6); The airtight cavity (5) has a plurality of air pipe threaded interfaces (7), the air pipe threaded interfaces (7) being connected to a first end of a T-shaped threaded connector (8) at the top of the vacuum cover (2), a second end of the T-shaped threaded connector (8) being connected to a first end of a pressure regulating valve (18), a second end of the pressure regulating valve (18) being connected to the pneumatic two-piece (9), and a third end of the T-shaped threaded connector (8) being connected to a pressure sensor (10).

2. The air blowing sealing device for the lifting stirring shaft according to claim 1, It is characterized in that Oil seals (11) are coaxially mounted on the inner upper end and the lower end of the airtight cavity (5), and the two oil seals (11) are limited in position by a support ring (12).

3. The air blowing sealing device for the lifting stirring shaft according to claim 2, It is characterized in that The side wall of the support ring (12) is provided with evenly distributed waist-shaped holes.

4. The air blowing sealing device for the lifting stirring shaft according to claim 2, It is characterized in that An annular scraper (13) is also sleeved on the outer circumference of the lifting sleeve (1), and the annular scraper (13) is connected to the lower end of the airtight cavity (5).

5. The air blowing sealing device for the lifting stirring shaft according to claim 1, It is characterized in that The opening position of the air pipe threaded interface (7) is tangent to the inner circle of the airtight cavity (5).

6. The air blowing sealing device for the lifting stirring shaft according to claim 1, It is characterized in that The packing seat (4) and the vacuum cover (2) are sealed via a second sealing ring (14).

7. The air blowing sealing device for the lifting stirring shaft according to claim 1, It is characterized in that A bushing (15) is coaxially provided between the packing seat (4) and the lifting sleeve (1).

8. The air blowing sealing device for the lifting stirring shaft according to claim 1, It is characterized in that The filler (16) is installed in the filler seat (4) by winding a coil.

9. The air blowing sealing device for the lifting stirring shaft according to claim 8, It is characterized in that The packing gland (17) is connected to the packing seat (4) by means of studs and is tightened to compact the packing (16).

10. A sealing method for an air-blowing sealing device for a lifting stirring shaft, the method being applied to the air-blowing sealing device for a lifting stirring shaft as claimed in any one of claims 1 to 9, It is characterized in that The air blowing sealing device for lifting and stirring shaft further comprises a controller, and the method comprises: Set the initial pressure and flow rate of the air source of the stirring equipment. The air source is introduced into the pneumatic two-way joint in the form of compressed air. The initial pressure of the air source is 0.03MPa and the flow rate is 30L / min. In response to the stirring device starting to operate, detecting the air pressure in the airtight cavity by means of a pressure sensor; If the air pressure in the airtight cavity is lower than 0.02 MPa, the pressure sensor feeds back the pressure signal to the controller, and the controller controls the pressure regulating valve to adjust the air source pressure so that the pressure in the airtight cavity is maintained at 0.02 MPa; In response to the stirring kettle of the stirring device being vacuumed, the vacuum degree is set to -0.098 MPa, the gas source is cut off, and the pressure in the gas-sealed cavity is always maintained at 0.02 MPa through the sealing of the packing in the packing seat, the sealing between the packing seat and the vacuum cover through the second sealing ring, the sealing of the inner upper end and the lower end of the gas-sealed cavity through the oil seal, and the sealing of the gas-sealed cavity and the packing seat through the first sealing ring; In response to the vacuum being broken in the stirring kettle of the stirring equipment, the air source is connected, compressed air is introduced into the pneumatic coupler, the pressure sensor feeds back the pressure signal to the controller, and the controller controls the pressure regulating valve to adjust the air source pressure so that the pressure in the airtight cavity is maintained at 0.02MPa.

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