Sealing device for stranding cage of positive pressure jet mill

Abstract

The utility model discloses a sealing device for a stranding cage of a positive pressure jet mill, which belongs to the field of sealing devices and comprises a cage body, a driving device, a spiral shaft and a spiral blade. Gas labyrinth seals are arranged in the front end sealing connection structure and the rear end sealing connection structure, compressed air is introduced into the gas labyrinth seals, and the compressed air is controlled by an air inlet assembly and communicated into the gas labyrinth seals through ventilation hoses. According to the utility model, the labyrinth sealing structure is improved, and the compressed air is introduced into the sealing cavity to form positive pressure, so that dust leakage is effectively prevented. The design of the integrated fixing piece and the end cover eliminates installation gaps, and powder leakage is further reduced. A pressure reducing valve and a drying tank which are equipped for compressed air respectively adjust the pressure of the compressed air and avoid moisture, and long-term efficient operation of the sealing device is ensured.

Description

Technical Field

[0001] The utility model relates to the field of sealing devices, in particular to a cage sealing device for a positive pressure airflow pulverizer. Background Art

[0002] The airflow pulverizer is a device that uses the supersonic airflow generated by the Laval nozzle in the lower body to scatter the materials and make the raw materials collide with each other for crushing. The advantage of the fluidized bed airflow pulverizer over other crushing equipment is that the amount of impurities introduced into the finished product after crushing is small, the particle size distribution is easy to control, and the distribution is concentrated. It is widely used in the depolymerization and crushing of various lithium battery positive / negative electrode materials and precursors.

[0003] In some process flows, the feeding cage can convey the material to the feed port of the airflow mill, but during the feeding process, the positive pressure feeding cage often leaks powder or accumulates material at the end, which in serious cases pollutes the environment and causes harm to workers, or fine powder enters the gap between the motor and the bearing, causing heat and damage to the equipment. The traditional countermeasure is to add a labyrinth structure to the transmission shaft cover assembly and the tail cover assembly. Although it can reduce powder leakage, due to rotational friction loss and dimensional errors, the sealing effect still decreases with use and needs to be replaced frequently, which still causes many inconveniences in actual production. Utility Model Content

[0004] The main purpose of the utility model is to provide a positive pressure airflow pulverizer cage sealing device, which can effectively solve the problems mentioned in the background technology.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A positive pressure air flow pulverizer cage sealing device comprises a cage body and a driving device connected to the cage head, a spiral shaft and spiral blades installed on the spiral shaft are arranged inside the cage body, and the driving device is connected to drive the spiral shaft to rotate, a front end sealing connection structure and a rear end sealing connection structure are respectively installed at both ends of the cage body, and a pneumatic labyrinth seal is arranged inside the front end sealing connection structure and the rear end sealing connection structure, compressed air is introduced into the pneumatic labyrinth seal, and the compressed air is controlled by an air intake assembly and connected to the inside of the pneumatic labyrinth seal through ventilation hoses.

[0007] Preferably, the air intake assembly includes an air intake pipe, which is externally connected to compressed air and is equipped with a valve for switching air.

[0008] Preferably, the air intake assembly further includes a pressure reducing valve and a drying tank, the inlet of the pressure reducing valve is connected to the air intake pipe, and the outlet is connected to the inlet of the drying tank, the outlet of the drying tank is connected to a three-way joint, and the two outlets of the three-way joint are respectively connected to a ventilation hose.

[0009] Preferably, the rear end sealing connection structure includes an end cover and a gas labyrinth seal, the end cover is connected to the tail of the cage body through a flange, a bearing seat is fixedly installed on the other side of the end cover, the bearing seat is connected to a connecting shaft, and the connecting shaft extends into the cage body and is fixedly connected to the spiral shaft.

[0010] Preferably, the end of the spiral shaft is fixedly connected to a sleeve via a flange, and the sleeve is fixedly connected to the connecting shaft via a pair of bolts.

[0011] Preferably, the gas labyrinth seal is divided into two parts: a rotating part and a fixed part. The rotating part and the fixed part are respectively provided with a sealing cavity, and the two can be staggered and meshed together. The rotating part is fixedly mounted on the shaft sleeve by bolts, and the fixed part is integrally processed with the end cover.

[0012] Preferably, an air hole connected to the sealing cavity is provided on the fixing member, the air hole passes through the fixing member and the end cover, and a hose connector is installed on the outer end surface of the end cover for connecting the ventilation hose.

[0013] Preferably, the front end sealing connection structure has the same structure as the rear end sealing connection structure and is symmetrically installed on the head of the cage body.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] 1. In the utility model, by improving the traditional labyrinth seal structure, compressed air is introduced into the chamber gap in the middle of the labyrinth seal, so that the dust inside the cage body cannot pass through the sealing chamber of the positive pressure gas labyrinth seal, which naturally and effectively reduces the leakage of powder; in addition, the fixing parts and the end cover constituting the gas labyrinth seal are designed as an integrated structure, which also avoids the leakage of powder caused by the gap between the fixing parts and the end cover when they are installed.

[0016] 2. At the same time, the utility model also adds an air intake component to the compressed air, in which the pressure reducing valve adjusts the pressure of the compressed air to prevent the air from being blown out of the gas labyrinth seal due to excessive pressure and affecting the feeding and sealing of the cage. The drying tank prevents the moisture in the compressed air from causing the powder at the seal to become damp and harden, thus affecting the feeding. The combination of the two further optimizes the gas labyrinth seal and ensures the efficient and long-term use of the sealing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the stranding cage of the utility model;

[0018] Figure 2 It is an overall schematic diagram of the sealing structure of the utility model;

[0019] Figure 3The rear end sealing connection structure of the utility model is disassembled Figure 1 ;

[0020] Figure 4 The rear end sealing connection structure of the utility model is disassembled Figure 2 ;

[0021] Figure 5 It is a cross-sectional schematic diagram of the gas labyrinth seal structure of the utility model.

[0022] In the figure: 1. cage body; 2. driving device; 3. screw shaft; 4. screw blade; 5. front end sealing connection structure; 6. rear end sealing connection structure; 7. air intake assembly; 8. bearing seat; 9. end cover; 10. bushing; 11. gas labyrinth seal; 12. air intake pipe; 13. valve; 14. pressure reducing valve; 15. drying tank; 16. three-way joint; 17. ventilation hose; 18. connecting shaft; 19. rotating part; 20. fixing part; 21. sealing chamber; 22. air hole; 23. hose joint. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0024] like Figure 1 As shown, a positive pressure air flow pulverizer cage includes a cage body 1 and a driving device 2 connected to the head of the cage body 1. A spiral shaft 3 and spiral blades 4 installed on the spiral shaft 3 are provided inside the cage body 1, and the driving device 2 is connected to drive the spiral shaft 3 to rotate. The driving device 2 includes a driving motor and a reducer, and its output end is fixedly connected to the spiral shaft 3 to drive the cage to work.

[0025] like Figure 1 , Figure 2 As shown, the two ends of the cage body 1 are respectively installed with a front end sealing connection structure 5 and a rear end sealing connection structure 6. The structure of the front end sealing connection structure 5 is the same as that of the rear end sealing connection structure 6, but they are respectively installed at the two ends of the cage body 1. The front end sealing connection structure 5 and the rear end sealing connection structure 6 are both provided with a gas labyrinth seal 11 inside. Compressed air is introduced into the gas labyrinth seal 11, and the compressed air is controlled by the air intake assembly 7 and connected to the inside of the gas labyrinth seal 11 through the ventilation hose 17.

[0026] Specifically, the air intake assembly 7 includes an air intake pipe 12, which is externally connected to compressed air and is equipped with a valve 13 for switching air. The air intake assembly 7 also includes a pressure reducing valve 14 and a drying tank 15. The inlet of the pressure reducing valve 14 is connected to the air intake pipe 12, and the outlet is connected to the inlet of the drying tank 15. The outlet of the drying tank 15 is connected to a three-way joint 16. The two outlets of the three-way joint 16 are respectively connected to a ventilation hose 17, which are respectively connected to the hose joint 23 on the front sealing connection structure 5 and the hose joint 23 on the rear sealing connection structure 6.

[0027] like Figure 3-Figure 5 As shown, the rear end sealing connection structure 6 includes an end cover 9 and a gas labyrinth seal 11. The end cover 9 is connected to the tail of the cage body 1 through a flange. A bearing seat 8 is fixedly installed on the other side of the end cover 9. The bearing seat 8 is connected to a connecting shaft 18, and the connecting shaft 18 extends into the cage body 1 and is fixedly connected to the spiral shaft 3.

[0028] Specifically, the end of the spiral shaft 3 is fixedly connected to a sleeve 10 through a flange, and the sleeve 10 is fixedly connected to the connecting shaft 18 through a pair of bolts. The gas labyrinth seal 11 is divided into two parts: a rotating part 19 and a fixed part 20. The rotating part 19 and the fixed part 20 are respectively provided with a sealing cavity 21, and the two can be staggered and meshed together. The rotating part 19 is fixedly installed on the sleeve 10 by bolts, and the fixed part 20 is integrally formed with the end cover 9. An air hole 22 is opened on the fixed part 20 to connect the sealing cavity 21. The air hole 22 passes through the fixed part 20 and the end cover 9, and a hose connector 23 is installed on the outer end surface of the end cover 9 for connecting the ventilation hose 17.

[0029] In actual use, the driving device 2 drives the screw shaft 3 to rotate, thereby driving the screw blade 4 to rotate, and then transporting the material inside the cage body 1 from the head feeding port to the tail feeding port. While the screw shaft 3 rotates, the shaft sleeve 10 fixedly connected thereto also rotates synchronously, which drives the rotating member 19 fixedly mounted on the shaft sleeve 10 to rotate, and the end cover 9 is fixedly mounted on the cage body 1, so the integrated fixing member 20 is fixed, and the rotating member 19 and the sealing cavity 21 on the fixing member 20 are staggered and meshed to form a labyrinth seal. If the powder is to leak from here, it must pass through the tortuous structure of the labyrinth seal to leak from the rotating connection between the end cover 9 and the connecting shaft 18. Due to the positive pressure environment inside the cage body 1, the powder will still enter the traditional labyrinth seal structure little by little, and will eventually leak from the rotating connection between the end cover 9 and the connecting shaft 18 over time. In the application, an air hole 22 is opened on the end cover 9 to connect to the sealing cavity 21 of the fixing member 20, and compressed air is connected to the outside, thereby forming a reverse positive pressure, which is similar to forming an "air wall" at the sealing cavity 21, preventing the powder inside the cage 1 from entering the gas labyrinth seal 11, thereby effectively avoiding the powder from slowly entering the labyrinth seal and forming powder leakage.

[0030] At the same time, since the pressure of the air compressor air tank is relatively high, directly connecting it to the gas labyrinth seal 11 will cause excessive air pressure, which can easily cause the powder inside the cage 1 to be blown up, resulting in poor material discharge and dust; and the compressed air contains moisture, directly connecting it to the gas labyrinth seal 11 will cause moisture in the sealing structure, which will further cause the powder to become damp and harden, affecting material discharge. Therefore, an additional air intake component 7 is installed, and the pressure reduction valve 14 is used to adjust the air pressure entering the gas labyrinth seal 11, and then the drying tank 15 is used to absorb the moisture in the compressed air to ensure dryness, and finally ensure the normal and long-term use of the gas labyrinth seal 11 to avoid frequent maintenance.

[0031] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A positive pressure air flow mill cage sealing device, comprising a cage body (1) and a driving device (2) connected to the head of the cage body (1), wherein a spiral shaft (3) and a spiral blade (4) mounted on the spiral shaft (3) are arranged inside the cage body (1), and the driving device (2) is connected to drive the spiral shaft (3) to rotate, characterized in that: A front end sealing connection structure (5) and a rear end sealing connection structure (6) are respectively installed at both ends of the cage body (1), and a gas labyrinth seal (11) is provided inside the front end sealing connection structure (5) and the rear end sealing connection structure (6). Compressed air is introduced into the gas labyrinth seal (11), and the compressed air is controlled by an air intake assembly (7) and connected to the inside of the gas labyrinth seal (11) through a ventilation hose (17).

2. A positive pressure airflow pulverizer cage sealing device according to claim 1, characterized in that: The air intake assembly (7) comprises an air intake pipe (12), the air intake pipe (12) is externally connected to compressed air and is equipped with a valve (13) for switching air.

3. A positive pressure airflow pulverizer cage sealing device according to claim 2, characterized in that: The air intake assembly (7) further comprises a pressure reducing valve (14) and a drying tank (15); the inlet of the pressure reducing valve (14) is connected to the air intake pipe (12), and the outlet is connected to the inlet of the drying tank (15); the outlet of the drying tank (15) is connected to a three-way joint (16), and the two outlets of the three-way joint (16) are respectively connected to a ventilation hose (17).

4. A positive pressure air flow mill cage sealing device according to claim 1, characterized in that: The rear end sealing connection structure (6) comprises an end cover (9) and a gas labyrinth seal (11); the end cover (9) is connected to the rear end of the cage body (1) via a flange; a bearing seat (8) is fixedly mounted on the other side of the end cover (9); the bearing seat (8) is connected to a connecting shaft (18), and the connecting shaft (18) extends into the cage body (1) and is fixedly connected to the spiral shaft (3).

5. A positive pressure airflow pulverizer cage sealing device according to claim 4, characterized in that: The end of the spiral shaft (3) is fixedly connected to a shaft sleeve (10) via a flange, and the shaft sleeve (10) is fixedly connected to a connecting shaft (18) via a pair of bolts.

6. A positive pressure air flow mill cage sealing device according to claim 5, characterized in that: The gas labyrinth seal (11) is divided into two parts, namely a rotating part (19) and a fixed part (20). The rotating part (19) and the fixed part (20) are respectively provided with a sealing cavity (21), and the two can be staggered and meshed together. The rotating part (19) is fixedly mounted on the shaft sleeve (10) by bolts, and the fixed part (20) is integrally formed with the end cover (9).

7. A positive pressure airflow pulverizer cage sealing device according to claim 6, characterized in that: The fixing member (20) is provided with an air hole (22) communicating with the sealing cavity (21); the air hole (22) penetrates the fixing member (20) and the end cover (9); and a hose connector (23) is installed on the outer end surface of the end cover (9) for connecting the ventilation hose (17).

8. A positive pressure airflow mill cage sealing device according to any one of claims 4 to 7, characterized in that: The front sealing connection structure (5) has the same structure as the rear sealing connection structure (6) and is symmetrically mounted on the head of the cage body (1).

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