A rotary sealing device for adhesive tape production equipment

Abstract

The present invention provides a rotary sealing device for adhesive tape production equipment, including a connecting rear end cover, the connecting rear end cover is gap-connected with the equipment connecting inner tube, the equipment connecting inner tube is outer-circuited with a connecting shaft, the rear end of the connecting shaft is embedded with a sealing H-ring impregnated with metal graphite, a corrugated auxiliary spring is arranged between the front end of the sealing H-ring and the connecting shaft, the rear end of the sealing H-ring and a hard alloy ring form a sealing pair, the hard alloy ring is inlaid on a butterfly ring, the butterfly ring is positioned on an intermediate connecting flange, and a spring group is arranged between the upper part of the butterfly ring and the intermediate connecting flange. The present invention adopts a corrugated auxiliary spring and a spring group to achieve double-seal wear compensation and bidirectional pressure buffering, and has better sealing reliability. The sealing H-ring made of hard alloy and impregnated with metal graphite can enhance the performance of high temperature resistance and high pressure resistance, and the sealing H-ring is directly embedded in the connecting shaft, which can greatly shorten the length of the rotary sealing device, making the structure compact.

Description

Technical Field

[0001] The invention relates to the technical field of rotary sealing, in particular to a rotary sealing device for adhesive tape production equipment. Background Art

[0002] Since the rotary sealing device of the adhesive tape production equipment on the market currently basically adopts a flat rotary joint, such as the attached Figure 4 As shown, it is suitable for water media and can adapt to higher rotation speeds. However, such a structure can adapt to lower temperatures, normally below 200 degrees, and has a relatively low pressure resistance, usually only within 1.0MPA. In addition, the overall size of such a joint is relatively long, which is not convenient for equipment installation. If a conventional rotary joint is to be forcibly installed, the connection method of the equipment must be changed, which is not worth the loss, increases production costs, and reduces economic benefits.

[0003] Therefore, conventional rotary joints in the market have the following problems in actual use: ① The operating conditions of adhesive tape production equipment are generally higher than those of conventional rubber and plastic machinery. The maximum temperature can reach 200 degrees Celsius, the maximum speed must reach 200 rpm, and the maximum pressure must reach 16 kg. Under such working conditions, the service life of ordinary rotary joints is relatively short, generally around 3 months, or even shorter, which makes the maintenance cost higher; ② Due to further innovation and improvement of production efficiency of adhesive tape production equipment, the installation space left for rotary joints is more effective, so there are also new requirements for the structural form of rotary joints, and conventional rotary joint structures cannot meet customer requirements. Summary of the invention

[0004] In order to solve the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a rotary sealing device for adhesive tape production equipment to overcome the defects in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a rotary sealing device for adhesive tape production equipment, comprising a connecting rear end cover, an intermediate connecting flange, an equipment connecting inner tube and a connecting front end cover, wherein the connecting rear end cover is gap-connected with the equipment connecting inner tube, and a first O-ring is arranged between the inner wall of the connecting rear end cover and the outer wall of the equipment connecting inner tube for sealing; a connecting shaft is arranged on the outer sleeve of the equipment connecting inner tube, and a sealing thread is provided at the front shaft end of the connecting shaft for connecting with the thread on the equipment roller, a sealing H-ring is embedded at the rear end of the connecting shaft, and the sealing H-ring is metal-impregnated graphite, and a third O-ring is arranged between the inner wall of the connecting shaft and the outer wall of the sealing H-ring for sealing; a sealing ring is arranged between the front end of the sealing H-ring and the connecting shaft A wave auxiliary spring is used to compensate for seal wear, the rear end of the sealing H-ring and the carbide ring form a sealing pair, and the carbide ring is embedded in the butterfly ring; the butterfly ring is positioned on the intermediate connecting flange, and a second O-ring is arranged between the outer wall of the butterfly ring and the inner wall of the intermediate connecting flange for sealing, a spring group is arranged between the upper part of the butterfly ring and the intermediate connecting flange for seal wear compensation, and an elastic cylindrical pin is arranged between the lower part of the butterfly ring and the intermediate connecting flange to keep the intermediate connecting flange and the butterfly ring in a stationary state; the rear end of the intermediate connecting flange is embedded in the rear end cover of the connection, and the front end of the intermediate connecting flange is embedded in the front end cover of the connection, and the lower part of the intermediate connecting flange is fixedly connected to the front end cover of the connection by a first hexagon socket bolt.

[0006] Through the above technical scheme, the wave auxiliary spring and the spring group are combined for seal wear compensation and pressure bidirectional buffering of the rotary sealing device. The double sealing method makes the rotary sealing device have better sealing reliability. The axial bidirectional buffering makes the rotary sealing device better protect the seal from being damaged when subjected to high pressure or external impact. The use of sealing H-rings made of cemented carbide and metal-impregnated graphite can enhance the high temperature and high pressure resistance of the rotary sealing device. The sealing H-ring is directly embedded in the connecting shaft, which can greatly shorten the length of the rotary sealing device and make the structure compact.

[0007] As a further explanation of the rotary sealing device of the adhesive tape production equipment described in the present invention, preferably, the sealing H-ring is provided with two symmetrical parallel concave edges, and the end of the connecting shaft is provided with two symmetrical parallel convex edges, so that the sealing H-ring is embedded in the connecting shaft to ensure the synchronous operation of the sealing H-ring and the connecting shaft.

[0008] As a further explanation of the rotary sealing device of the adhesive tape production equipment described in the present invention, preferably, two threaded connection grooves are provided in the same direction side by side at the bottom of the square outer end surface connected to the rear end cover, which serve as a left connection port and a right connection port and are respectively connected to the inlet and outlet pipes; the inner wall of the equipment connecting inner tube, the inner wall connected to the rear end cover and the right connection port are connected in sequence to form a first medium channel; the inner wall of the connecting shaft, the inner wall of the sealing H-ring, the inner wall of the carbide ring, the inner wall of the butterfly ring, the inner wall of the middle connecting flange, the inner wall connected to the rear end cover and the left connection port are connected in sequence to form a second medium channel.

[0009] As a further description of the rotary sealing device of the adhesive tape production equipment described in the present invention, preferably, an end surface metal composite gasket is arranged between the rear end cover and the middle connecting flange.

[0010] As a further description of the rotary sealing device for the adhesive tape production equipment of the present invention, preferably, two deep groove ball bearings are sleeved between the connecting shaft and the connecting front end cover.

[0011] As a further explanation of the rotating sealing device of the adhesive tape production equipment described in the present invention, preferably, the right side of the deep groove ball bearing is fixed by an elastic retaining ring for the shaft and an elastic retaining ring for the hole, the elastic retaining ring for the shaft is inserted into the connecting shaft, and the elastic retaining ring for the hole is inserted into the connecting front end cover.

[0012] As a further description of the rotary sealing device of the adhesive tape production equipment described in the present invention, preferably, the rear end cover and the middle connecting flange are connected by a second hexagon socket bolt.

[0013] As a further description of the rotary sealing device of the adhesive tape production equipment of the present invention, preferably, the carbide ring is embedded in the butterfly ring by ultra-high temperature hot embedding.

[0014] The beneficial effects of the present invention are as follows: the present invention adopts a wave auxiliary spring and a spring group combination for seal wear compensation and pressure bidirectional buffering of a rotary sealing device. The double sealing method makes the rotary sealing device have better sealing reliability. The axial bidirectional buffering makes the rotary sealing device better protect the seal from being damaged when subjected to high pressure or external impact. The use of cemented carbide and metal-impregnated graphite sealing H-rings can enhance the high temperature and high pressure resistance of the rotary sealing device. The sealing H-ring is directly embedded in the connecting shaft, which can greatly shorten the length of the rotary sealing device and make the structure compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the rotary sealing device of the adhesive tape production equipment of the present invention.

[0016] Figure 2 It is a left side view of the rotary sealing device of the adhesive tape production equipment of the present invention.

[0017] Figure 3 It is a schematic diagram of the assembly of the sealing H-ring and the connecting shaft of the present invention.

[0018] Figure 4 It is a structural schematic diagram of a planar rotary joint in the prior art.

[0019] In the attached drawings: rear end cover 1, first O-ring 2, end metal composite gasket 3, second O-ring 4, intermediate connecting flange 5, spring group 6, butterfly ring 7, carbide ring 8, deep groove ball bearing 9, connecting shaft 10, second hexagon socket bolt 11, elastic retaining ring for shaft 12, elastic retaining ring for hole 13, wave auxiliary spring 14, third O-ring 15, sealing H-ring 16, elastic cylindrical pin 17, first hexagon socket bolt 18, equipment connecting inner tube 19 and connecting front end cover 20. DETAILED DESCRIPTION

[0020] In order to further understand the structure, features and other purposes of the present invention, the preferred embodiments are described in detail with reference to the accompanying drawings as follows. The embodiments described in the drawings are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention.

[0021] like Figure 1 As shown, Figure 1The present invention is a schematic diagram of the structure of the rotary sealing device of the adhesive tape production equipment; the rotary sealing device of the adhesive tape production equipment comprises a connecting rear end cover 1, an intermediate connecting flange 5, an equipment connecting inner tube 19 and a connecting front end cover 20, wherein the connecting rear end cover 1 is gap-connected with the equipment connecting inner tube 19, and a first O-ring 2 is arranged between the inner wall of the connecting rear end cover 1 and the outer wall of the equipment connecting inner tube 19 for sealing; a connecting shaft 10 is arranged on the outer sleeve of the equipment connecting inner tube 19, and the front shaft end of the connecting shaft 10 has a sealing thread for connecting with the thread on the equipment roller, and a sealing H-ring 16 is embedded in the rear end of the connecting shaft 10, and the sealing H-ring 16 is metal-impregnated graphite, and a third O-ring 15 is arranged between the inner wall of the connecting shaft 10 and the outer wall of the sealing H-ring 16 for sealing; a wave auxiliary spring 14 is arranged between the front end of the sealing H-ring 16 and the connecting shaft 10 , to compensate for sealing wear, the rear end of the sealing H-ring 16 and the carbide ring 8 form a sealing pair, the carbide ring 8 is embedded in the butterfly ring 7, preferably, the carbide ring 8 is embedded in the butterfly ring 7 by ultra-high temperature hot embedding; the butterfly ring 7 is positioned on the intermediate connecting flange 5, and a second O-ring 4 is arranged between the outer wall of the butterfly ring 7 and the inner wall of the intermediate connecting flange 5 for sealing, a spring group 6 is arranged between the upper part of the butterfly ring 7 and the intermediate connecting flange 5 for sealing wear compensation, and an elastic cylindrical pin 17 is arranged between the lower part of the butterfly ring 7 and the intermediate connecting flange 5 to keep the intermediate connecting flange 5 and the butterfly ring 7 in a stationary state; the rear end of the intermediate connecting flange 5 is embedded in the connecting rear end cover 1, and the front end of the intermediate connecting flange 5 is embedded in the connecting front end cover 20, and the lower part of the intermediate connecting flange 5 is fixedly connected to the connecting front end cover 20 by a first hexagon socket bolt 18.

[0022] like Figure 3 As shown, the sealing H-ring 16 is provided with two symmetrical parallel concave edges, and the end of the connecting shaft 10 is provided with two symmetrical parallel convex edges, so that the sealing H-ring 16 is embedded in the connecting shaft 10 to ensure that the sealing H-ring 16 and the connecting shaft 10 operate synchronously.

[0023] like Figure 2 As shown, the bottom of the square outer end surface connected to the rear end cover 1 is provided with two threaded connection grooves in the same direction and in parallel, which are connected to the inlet and outlet pipes as the left connection port L and the right connection port R respectively. The inner wall of the equipment connecting inner tube 19, the inner wall of the connecting rear end cover 1 and the right connection port R are connected in sequence to form a first medium channel; the inner wall of the connecting shaft 10, the inner wall of the sealing H-ring 16, the inner wall of the cemented carbide ring 8, the inner wall of the butterfly ring 7, the inner wall of the intermediate connecting flange 5, the inner wall of the connecting rear end cover 1 and the left connection port L are connected in sequence to form a second medium channel.

[0024] like Figure 1As shown, an end metal composite pad 3 is provided between the connecting rear end cover 1 and the intermediate connecting flange 5. Two deep groove ball bearings 9 are sleeved between the connecting shaft 10 and the connecting front end cover 20. The right side of the deep groove ball bearing 9 is fixed by a shaft elastic circlip 12 and a hole elastic circlip 13. The shaft elastic circlip 12 is inserted into the connecting shaft 10, and the hole elastic circlip 13 is inserted into the connecting front end cover 20. The connecting rear end cover 1 and the intermediate connecting flange 5 are connected by a second hexagon socket bolt 11.

[0025] The above-mentioned rotary sealing device of the adhesive tape production equipment achieves the reduction of the overall size of the rotary sealing device by changing the structural form of the rotary sealing device and optimizing the structure of the rotary sealing device. For example, the side-by-side design of the connection ports for the inlet and outlet of the medium, the design of the spring group, the design of the corrugated auxiliary spring, and the sealing H-ring directly embedded in the connecting shaft can greatly shorten the length of the rotary sealing device. By changing the structure and material of the sealing composition, the seal wear compensation and pressure bidirectional buffering of the spring group and the corrugated auxiliary spring are adopted, and the double seal compensation method makes the rotary sealing device have better sealing reliability, and the axial bidirectional buffering makes the rotary sealing device better protect the seal from being damaged when it is subjected to high pressure or external impact. The sealing H-ring of cemented carbide and metal-impregnated graphite is used to increase the temperature and pressure resistance of the rotary sealing device, while maintaining the advantage of the original plane seal that can adapt to high speed, thereby extending the service life of the rotary sealing device of the adhesive tape production equipment, reducing maintenance costs, and improving economic benefits.

[0026] It should be noted that the above invention content and specific implementation methods are intended to demonstrate the practical application of the technical solution provided by the present invention and should not be interpreted as limiting the scope of protection of the present invention. Those skilled in the art can make various modifications, equivalent substitutions or improvements within the spirit and principles of the present invention. The scope of protection of the present invention shall be subject to the attached claims.

Claims

1. A rotary sealing device for adhesive tape production equipment, characterized in that: It comprises a connecting rear end cover (1), an intermediate connecting flange (5), an equipment connecting inner pipe (19) and a connecting front end cover (20), wherein: The rear end cover (1) is connected to the equipment connection inner tube (19) in a gap connection, and a first O-type sealing ring (2) is provided between the inner wall of the rear end cover (1) and the outer wall of the equipment connection inner tube (19) for sealing; The outer sleeve of the equipment connecting inner tube (19) is provided with a connecting shaft (10), the front shaft end of the connecting shaft (10) has a sealing thread for connecting with the thread on the equipment roller, the rear end of the connecting shaft (10) is embedded with a sealing H-ring (16), the sealing H-ring (16) is metal-impregnated graphite, and a third O-ring (15) is arranged between the inner wall of the connecting shaft (10) and the outer wall of the sealing H-ring (16) for sealing; the sealing H-ring (16) is provided with two symmetrical parallel concave edges, and the end of the connecting shaft (10) is provided with two symmetrical parallel convex edges, so that the sealing H-ring (16) is embedded in the connecting shaft (10) to ensure that the sealing H-ring (16) and the connecting shaft (10) operate synchronously; A wave auxiliary spring (14) is arranged between the front end of the sealing H-ring (16) and the connecting shaft (10) to compensate for seal wear. The rear end of the sealing H-ring (16) and the hard alloy ring (8) form a sealing pair. The hard alloy ring (8) is embedded in the butterfly ring (7) by ultra-high temperature hot embedding. The butterfly ring (7) is positioned on the intermediate connecting flange (5), a second O-ring (4) is arranged between the outer wall of the butterfly ring (7) and the inner wall of the intermediate connecting flange (5) for sealing, a spring group (6) is arranged between the upper part of the butterfly ring (7) and the intermediate connecting flange (5) for compensating for sealing wear, and an elastic cylindrical pin (17) is arranged between the lower part of the butterfly ring (7) and the intermediate connecting flange (5) so as to keep the intermediate connecting flange (5) and the butterfly ring (7) in a stationary state; The rear end of the intermediate connecting flange (5) is embedded in the connecting rear end cover (1), the front end of the intermediate connecting flange (5) is embedded in the connecting front end cover (20), and the lower part of the intermediate connecting flange (5) is fixedly connected to the connecting front end cover (20) by a first hexagon socket bolt (18).

2. The rotary sealing device for adhesive tape production equipment according to claim 1, characterized in that: The bottom of the square outer end surface connected to the rear end cover (1) is provided with two threaded connection grooves arranged side by side in the same direction, serving as a left connection port (L) and a right connection port (R) for connecting to the inlet and outlet pipes respectively; The inner wall of the equipment connecting inner tube (19), the inner wall of the rear end cover (1) and the right connecting port (R) are connected in sequence to form a first medium channel; The inner wall of the connecting shaft (10), the inner wall of the sealing H-ring (16), the inner wall of the hard alloy ring (8), the inner wall of the butterfly ring (7), the inner wall of the intermediate connecting flange (5), the inner wall of the connecting rear end cover (1) and the left connecting port (L) are connected in sequence to form a second medium channel.

3. The rotary sealing device for adhesive tape production equipment according to claim 1, characterized in that: An end surface metal composite gasket (3) is provided between the rear end cover (1) and the middle connection flange (5).

4. The rotary sealing device for adhesive tape production equipment according to claim 1, characterized in that: Two deep groove ball bearings (9) are sleeved between the connecting shaft (10) and the connecting front end cover (20).

5. The rotary sealing device for adhesive tape production equipment according to claim 4, characterized in that: The right side of the deep groove ball bearing (9) is fixed by a shaft elastic circlip (12) and a hole elastic circlip (13). The shaft elastic circlip (12) is plugged into the connecting shaft (10), and the hole elastic circlip (13) is plugged into the connecting front end cover (20).

6. The rotary sealing device for adhesive tape production equipment according to claim 1, characterized in that: The rear end cover (1) and the middle connection flange (5) are connected via a second hexagon socket head bolt (11).

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