Shaft sealing device of powder mixing machine

Abstract

The utility model provides a powder mixing machine shaft sealing device which comprises a base sleeve connected with a mixing machine main shaft in a sleeving mode, the mixing machine main shaft penetrates through a mixing machine side plate, the base sleeve is arranged on the outer side of the mixing machine side plate, a clamping cavity space is formed between the base sleeve and the mixing machine main shaft, and a sealing gasket, a pressing ring and a packing are connected in the clamping cavity space in a sleeving mode. One side of the sealing washer is tightly attached to the outer wall of the side plate of the mixing machine, the pressing ring is arranged between the sealing washer and the packing and tightly presses the sealing washer, the main shaft of the mixing machine is further sleeved with the gland sleeve, one end of the gland sleeve tightly presses the packing, and the problem of sealing of the stirring shaft of the powder mixing machine for food is solved.

Description

Technical Field

[0001] The utility model relates to the field of shaft seals of mixers, in particular to a shaft seal device for a powder mixer. Background Art

[0002] The basic structure of the existing food powder mixer is a structure of a mixing chamber plus a stirring shaft plus stirring blades. The driving end and the supporting end at the other end of the stirring shaft with blades must be outside the mixing chamber, and a good sealing structure is required at the place where it penetrates the chamber wall to prevent powder from overflowing.

[0003] For the shaft seal of the existing mixer, the packing seal of polytetrafluoroethylene is used. During actual use, when powder is mixed, it enters the inside of the shaft seal device, and powder material carbonization occurs simultaneously under extrusion, rotation and high temperature. Under the extrusion of the powder material, the packing seal of polytetrafluoroethylene needs to be replaced frequently, consuming manpower, material resources and reducing production efficiency. Content of the Utility Model

[0004] The utility model provides a shaft seal device for a powder mixer, which solves the problem of the shaft seal of the stirring shaft of the food powder mixer.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a shaft seal device for a powder mixer, including a base sleeve sleeved on the main shaft of the mixer. The main shaft of the mixer passes through the side plate of the mixer, and the base sleeve is arranged outside the side plate of the mixer. There is a clamping cavity space between the base sleeve and the main shaft of the mixer. A sealing washer, a pressing ring and a packing are sleeved in the clamping cavity space. One side of the sealing washer is tightly attached to the outer wall of the side plate of the mixer. The pressing ring is arranged between the sealing washer and the packing and presses the sealing washer tightly. A gland sleeve is also sleeved on the main shaft of the mixer, and one end of the gland sleeve presses the packing tightly.

[0006] In a preferred solution, a main shaft sliding sleeve is sleeved outside the main shaft of the mixer. A sliding sleeve setscrew connected by thread is arranged inside the main shaft sliding sleeve, and the sliding sleeve setscrew presses tightly against the main shaft of the mixer. A sealing ring is arranged between the outer wall of the main shaft of the mixer and the inner wall of the main shaft sliding sleeve. The sealing washer and the inner wall of the packing are in contact with the outer wall of the main shaft sliding sleeve.

[0007] In a preferred solution, the base sleeve includes a first flange ring and a second flange ring arranged coaxially. A positioning groove is arranged on one side of the first flange ring and the second flange ring close to each other. A positioning ring is also provided, and the positioning ring is snapped into the positioning groove. A plurality of second through holes are arranged along the circumference of the first flange ring, and a plurality of second threaded holes are arranged along the circumference of the second flange ring. A plurality of connecting bolts are also provided, and the connecting bolts pass through the second through holes to be threadedly connected with the second threaded holes.

[0008] In a preferred solution, a plurality of second bolts are arranged along the circumference of the gland sleeve, and a plurality of first threaded holes are arranged along the circumference of the first flange ring. Each second bolt is threadedly connected with each first threaded hole.

[0009] In a preferred embodiment, a plurality of side plate threaded holes are provided on the side plate of the mixer, a plurality of first through holes are provided along the circumference on the second flange ring, and a plurality of first bolts are further provided. Each first bolt passes through the first through hole to be threadedly connected with the side plate threaded hole.

[0010] In a preferred embodiment, air holes are provided on the side plate of the mixer, and an air ring groove is provided at one port of the air hole on the side wall of the side plate of the mixer. The main shaft of the mixer is provided with a shaft shoulder inside the side plate of the mixer, and the shaft shoulder covers the air ring groove. An avoidance hole is provided on the second flange ring, and an air joint is further provided. The air joint passes through the avoidance hole and communicates with the other port of the air hole, and positive pressure gas is introduced into the air hole through the air joint.

[0011] The beneficial effects of the present utility model are as follows: The use of a sealing gasket and packing to form a double seal realizes the solution of the problem of production leakage during the powder mixing process of the mixer through a new structure shaft seal, extends the replacement time of the sealing packing, and solves the quality problems caused by dust at the work site; the sealing gasket and the packing are separated by a pressure ring, and the packing is fixed by a gland sleeve, improving the rigidity and sealing effect of the sealing structure; positive pressure sealing is adopted at the forefront of the rotating gap to inhibit a large amount of powder from entering, improve the sealing environment, and reduce the requirements for the sealing structure. Description of the Drawings

[0012] The present utility model will be further described below with reference to the drawings and embodiments.

[0013] Figure 1 It is a schematic diagram of the powder mixer of the present utility model.

[0014] Figure 2 It is a structural diagram of the seal between the side of the powder mixer of the present utility model and the rotating main shaft.

[0015] Figure 3 It is a structural diagram of the base sleeve of the present utility model.

[0016] Figure 4 It is an exploded view of the base sleeve of the present utility model.

[0017] Figure 5 It is an enlarged view of the seal structure of the present utility model.

[0018] In the figure: sealing gasket 1; pressure ring 2; packing 3; base sleeve 4; first flange ring 401; second flange ring 402; positioning ring 403; connecting bolt 404; first through hole 405; first threaded hole 406; avoidance hole 407; positioning groove 408; second threaded hole 409; second through hole 410; gland sleeve 5; first bolt 6; second bolt 7; mixer main shaft 8; shaft shoulder 801; main shaft sliding sleeve 9; sliding sleeve setscrew 10; powder mixer 11; mixer side plate 1101; side plate threaded hole 1102; air hole 1103; air ring groove 1104; air joint 12; sealing ring 13. Detailed implementation mode

[0019] As Figures 1-5 shown in the figure, a shaft sealing device for a powder mixer includes a base sleeve 4 sleeved on the main shaft 8 of the mixer. The main shaft 8 of the mixer passes through the side plate 1101 of the mixer, and the base sleeve 4 is arranged outside the side plate 1101 of the mixer. There is a clamping cavity space between the base sleeve 4 and the main shaft 8 of the mixer. A sealing gasket 1, a pressing ring 2 and a packing 3 are sleeved in the clamping cavity space. One side of the sealing gasket 1 is tightly attached to the outer wall of the side plate 1101 of the mixer. The pressing ring 2 is arranged between the sealing gasket 1 and the packing 3 and presses the sealing gasket 1 tightly. A gland sleeve 5 is also sleeved on the main shaft 8 of the mixer, and one end of the gland sleeve 5 presses the packing 3 tightly.

[0020] In a preferred solution, a main shaft sliding sleeve 9 is sleeved outside the main shaft 8 of the mixer. A sliding sleeve setscrew 10 connected by threads is arranged inside the main shaft sliding sleeve 9, and the sliding sleeve setscrew 10 presses tightly against the main shaft 8 of the mixer. A sealing ring 13 is arranged between the outer wall of the main shaft 8 and the inner wall of the main shaft sliding sleeve 9. The inner walls of the sealing gasket 1 and the packing 3 are in contact with the outer wall of the main shaft sliding sleeve 9.

[0021] The main shaft sliding sleeve 9 plays a role in protecting the main shaft 8 of the mixer, preventing the packing 3 from wearing the main shaft 8 of the mixer. The main shaft sliding sleeve 9 is fixedly connected to the main shaft 8 of the mixer and rotates integrally. A polytetrafluoroethylene coating is arranged on the surface of the main shaft sliding sleeve 9. The sealing gasket 1 and the pressing ring 2 are of an annular structure. The inner wall of the sealing gasket 1 is tightly attached to the outer wall of the main shaft sliding sleeve 9. The pressing ring 2 separates the sealing gasket 1 and the packing 3 to improve the rigidity of the sealing structures on both sides, but it has a clearance fit with the main shaft sliding sleeve 9 itself. After the packing 3 is wound around multiple turns in the clamping cavity space, the gland sleeve 5 is provided with a flange, and the flange extends into the clamping cavity space and presses the end of the packing 3 tightly.

[0022] Through the double sealing effects of the sealing gasket 1 and the packing 3, the sealing effect is enhanced, and the sealing reliability during long-term operation is improved.

[0023] In a preferred solution, the base sleeve 4 includes a first flange ring 401 and a second flange ring 402 arranged coaxially. A positioning groove 408 is arranged on one side of the first flange ring 401 and the second flange ring 402 close to each other. A positioning ring 403 is also provided, and the positioning ring 403 is snapped into the positioning groove 408. The first flange ring 401 is provided with a plurality of second through holes 410 along the circumferential direction. The second flange ring 402 is provided with a plurality of second threaded holes 409 along the circumferential direction. A plurality of connecting bolts 404 are also provided, and the connecting bolts 404 pass through the second through holes 410 to be threadedly connected with the second threaded holes 409.

[0024] Tighten the connecting bolts 404 so that the first flange ring 401 and the second flange ring 402 clamp both ends of the positioning ring 403 to form the base sleeve 4.

[0025] The positioning ring 403 can be made of polytetrafluoroethylene material, or a polytetrafluoroethylene coating can be arranged on the inner wall to prevent the packing 3 from being worn.

[0026] In a preferred embodiment, the gland sleeve 5 is provided with a plurality of second bolts 7 along the circumferential direction, the first flange ring 401 is provided with a plurality of first threaded holes 406 along the circumferential direction, and each second bolt 7 is threadedly connected to each first threaded hole 406.

[0027] The flange of the gland sleeve 5 can be inserted into the inner wall of the first flange ring 401. By rotating each second bolt 7, the distance between the gland sleeve 5 and the first flange ring 401 can be adjusted until the flange tightly presses the packing 3, and the packing 3, the gland 2, and the sealing washer 1 are sequentially pressed tightly.

[0028] In a preferred embodiment, the side plate of the mixer 1101 is provided with a plurality of side plate threaded holes 1102, the second flange ring 402 is provided with a plurality of first through holes 405 along the circumferential direction, and a plurality of first bolts 6 are further provided. Each first bolt 6 passes through the first through hole 405 and is threadedly connected to the side plate threaded hole 1102.

[0029] In a preferred embodiment, the side plate of the mixer 1101 is provided with an air hole 1103, and an air ring groove 1104 is provided at one port of the air hole 1103 on the side wall of the side plate of the mixer 1101. The main shaft 8 of the mixer is provided with a shaft shoulder 801 inside the side plate 1101 of the mixer. The shaft shoulder 801 covers the air ring groove 1104. The second flange ring 402 is provided with an avoidance hole 407, and an air joint 12 is further provided. The air joint 12 passes through the avoidance hole 407 and communicates with the other port of the air hole 1103, and positive pressure gas is introduced into the air hole 1103 through the air joint 12.

[0030] The positive pressure gas enters the air ring groove 1104 through the air hole 1103 and uniformly overflows the positive pressure gas from the gap of the shaft shoulder 801 into the powder mixer 11, achieving a positive pressure sealing effect on the internal powder. Since the gap between the shaft shoulder 801 and the inner wall of the side plate 1101 of the mixer is at the front end of the sealing washer 1 in the powder overflow path, the positive pressure sealing protects the sealing washer 1 and greatly reduces the powder that can contact the sealing washer 1.

[0031] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations on the present invention. The protection scope of the present invention should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A powder mixer shaft sealing device, characterized in that: Included with A basic sleeve (4) is sleeved on a mixer main shaft (8), the mixer main shaft (8) passes through a mixer side plate (1101), the basic sleeve (4) is arranged on the outside of the mixer side plate (1101), a clamping space is provided between the basic sleeve (4) and the mixer main shaft (8), a sealing gasket (1), a pressing ring (2) and a packing (3) are sleeved in the clamping space, one side of the sealing gasket (1) is closely attached to the outer wall of the mixer side plate (1101), the pressing ring (2) is arranged between the sealing gasket (1) and the packing (3) and presses the sealing gasket (1), and a gland sleeve (5) is also sleeved on the mixer main shaft (8), one end of the gland sleeve (5) presses the packing (3).

2. The powder mixer shaft sealing device according to claim 1, characterized in that: A main shaft sleeve (9) is sleeved on the outer side of the mixer main shaft (8), a sleeve top screw (10) connected by a thread is arranged inside the main shaft sleeve (9), the sleeve top screw (10) presses against the mixer main shaft (8), a sealing ring (13) is arranged between the outer wall of the mixer main shaft (8) and the inner wall of the main shaft sleeve (9), and the inner walls of the sealing gasket (1) and the packing (3) contact the outer wall of the main shaft sleeve (9).

3. The powder mixer shaft sealing device according to claim 1, characterized in that: The basic sleeve (4) comprises a first flange ring (401) and a second flange ring (402) which are coaxially arranged. A positioning groove (408) is provided on one side of the first flange ring (401) and the second flange ring (402) which are close to each other. A positioning ring (403) is also provided. The positioning ring (403) is inserted into the positioning groove (408). The first flange ring (401) is provided with a plurality of second through holes (410) along the circumference. The second flange ring (402) is provided with a plurality of second threaded holes (409) along the circumference. A plurality of connecting bolts (404) are also provided. The connecting bolts (404) pass through the second through holes (410) to be threadedly connected with the second threaded holes (409).

4. The powder mixer shaft sealing device according to claim 3, characterized in that: The gland sleeve (5) is provided with a plurality of second bolts (7) along the circumferential direction, and the first flange ring (401) is provided with a plurality of first threaded holes (406) along the circumferential direction, and each second bolt (7) is threadedly connected to each first threaded hole (406).

5. The powder mixer shaft sealing device according to claim 3, characterized in that: A plurality of side plate threaded holes (1102) are provided on the mixer side plate (1101), a plurality of first through holes (405) are provided on the second flange ring (402) along the circumferential direction, and a plurality of first bolts (6) are also provided, each first bolt (6) passing through the first through hole (405) to be threadedly connected to the side plate threaded hole (1102).

6. The powder mixer shaft sealing device according to claim 3, characterized in that: An air hole (1103) is provided on the mixer side plate (1101), and an air ring groove (1104) is provided at one end of the air hole (1103) on the side wall of the mixer side plate (1101). A shaft shoulder (801) is provided on the inner side of the mixer side plate (1101), and the shaft shoulder (801) covers the air ring groove (1104). An avoidance hole (407) is provided on the second flange ring (402), and an air joint (12) is also provided. The air joint (12) passes through the avoidance hole (407) and is connected to the other end of the air hole (1103), and positive pressure gas is introduced into the air hole (1103) through the air joint (12).

Images