Roll changing device for double-pressing-area calender

Abstract

The utility model discloses a roll changing device for a double-pressing-area calender, which relates to the technical field of roll changing of calenders and comprises a support frame, a load trolley and a track, a hanging bracket is arranged on the load trolley, the bottom of the hanging bracket is rotatably connected onto the load trolley through a rotating bearing, a cantilever is arranged on the top of the hanging bracket, and a trailer is arranged on the cantilever. The lower portion of the trailer is connected with an electric hoist and a rotating motor to rotate the hanging bracket, the cantilever extends outwards, the trailer moves on the cantilever, the hanging bracket is hoisted through the electric hoist, the hanging bracket is rotated again, the cantilever extends inwards, the trailer moves on the cantilever, a new compression roller is placed on the loading trolley, and a worker rapidly disassembles the old compression roller and hoists the old compression roller through the electric hoist. The trailer moves on the cantilever, the old compression roller is placed on the loading trolley, the electric hoist hoists the new compression roller, the trailer moves on the cantilever, the new compression roller is hoisted at the installation position, the roller replacement efficiency is improved, the shutdown roller replacement time is shortened, and the paper machine efficiency is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of calender roll replacement, in particular to a roll replacement device for a double-nip calender. Background Art

[0002] A calender is a device used to improve the gloss of paper, a type of calendering process. After coating and drying, printed materials can be calendered to further enhance the smoothness and gloss of the varnish. Typical varnish gloss levels range from 65-85%, but calendering can reach over 90-95%. As a crucial piece of equipment in papermaking, the calender serves two primary functions: improving smoothness and gloss; and correcting the thickness of the paper web. The more nips the paper passes through, the better the effect. Papermaking calenders have two different pressure control modes: hard and soft. Hard calendering involves adjusting the pressure of the calender rollers to distribute the calendered material as evenly as possible. Soft calendering involves controlling and adjusting the pressure of the calender rollers to adapt to the material's actual conditions, thereby achieving the optimal calendering effect.

[0003] Soft-pressing calenders can improve paper smoothness, firmness, ink absorption, and bulk. However, compared to hard calenders, soft rollers on soft calenders have a shorter lifespan. Typically, they last about 15-25 days before they must be removed and resurfaced. Currently, roller replacement is often done manually, which is time-consuming and labor-intensive, requiring constant downtime and restart. Combined with the time required for roller replacement and paper machine stabilization, this process can take anywhere from 3-4 hours to 7-8 hours, severely impacting paper machine efficiency. Utility Model Content

[0004] In order to overcome the defects of time-consuming and labor-intensive roll changing in the prior art, the utility model provides a roll changing device for a double-nip calender.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a roller changing device for a double-pressure zone calender, comprising a support frame and a load-carrying trolley, the support frame is provided with two parallel tracks that are arranged and cooperate with the load-carrying trolley, the load-carrying trolley is provided with a hanger, the bottom of the hanger is rotatably connected to the load-carrying trolley through a rotating bearing, the bottom of the load-carrying trolley is provided with a rotating motor connected to the hanger, the top of the hanger is provided with a cantilever, the cantilever is provided with a trailer, and the lower part of the trailer is connected to an electric hoist.

[0006] As a further improvement of the present invention, the trailer includes a U-shaped bracket, a rotating shaft is provided on the U-shaped bracket, a plurality of rollers are fixed on the rotating shaft, and a servo motor connected to the rotating shaft is provided on the side of the U-shaped bracket.

[0007] As a further improvement of the present invention, a lifting eye bolt for connecting to the electric hoist is provided at the bottom of the U-shaped hanger.

[0008] As a further improvement of the present invention, a rib plate is provided at the connection between the hanger and the cantilever.

[0009] As a further improvement of the present invention, a limiting frame is provided at the right end of the cantilever.

[0010] As a further improvement of the present invention, the support frame is an I-shaped frame.

[0011] Compared with the prior art, the utility model has the following beneficial effects: in this solution, the rotating motor rotates the hanger to extend the cantilever, the trailer moves on the cantilever, and is hoisted by the electric hoist. The hanger is rotated again to extend the cantilever inward, the trailer moves on the cantilever, and the new pressure roller is placed on the load-carrying trolley. The load-carrying trolley transports the pressure roller and transports it quickly along the track to the roller changing position. The staff quickly disassembles the old pressure roller and hoists it by the electric hoist. The trailer moves on the cantilever and places the old pressure roller on the load-carrying trolley. The electric hoist hoists the new pressure roller. The trailer moves on the cantilever and hoists the new pressure roller to the installation position to complete the installation, thereby improving the roller changing efficiency, reducing the downtime time for roller changing, and effectively improving the efficiency of the paper machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0013] Figure 1 The utility model is a structural schematic diagram of a roller changing device for a double-nip calender.

[0014] Figure 2 It is a structural schematic diagram of the trailer of the present utility model.

[0015] In the figure: 1. Support frame; 2. Load-carrying trolley; 3. Track; 4. Hanger; 5. Rotating bearing; 6. Rotating motor; 7. Cantilever; 8. Trailer; 81. U-shaped hanger; 82. Rotating shaft; 83. Roller; 84. Servo motor; 85. Eyebolt; 9. Electric hoist; 10. Rib plate; 11. Limit frame. DETAILED DESCRIPTION

[0016] In order to make the technical solution and beneficial effects of the present invention more clearly understood, the present invention will be further described in detail below with reference to specific embodiments.

[0017] Reference Figure 1The embodiment of the utility model discloses a roller changing device for a double-pressure zone calender, comprising a support frame 1 and a load-carrying trolley 2. The support frame 1 is provided with two parallel tracks 3 that cooperate with the load-carrying trolley 2. The load-carrying trolley 2 is provided with a hanger 4. The bottom of the hanger 4 is rotatably connected to the load-carrying trolley 2 through a rotating bearing 5. The bottom of the load-carrying trolley 2 is provided with a rotating motor 6 connected to the hanger 4. The top of the hanger 4 is provided with a cantilever 7. The cantilever 7 is provided with a trailer 8. The lower part of the trailer 8 is connected to an electric hoist 9.

[0018] A limit frame 11 is provided at the right end of the cantilever 7 to protect the trailer 8 from separating from the cantilever 7 .

[0019] The support frame 1 is laid from the roller storage place to the calender. When the roller needs to be changed, the load trolley 2 is located at the roller storage place, the rotating motor 6 rotates the hanger 4, extends the cantilever 7, and the trailer 8 moves on the cantilever 7. It is hoisted by the electric hoist 9, and the hanger 4 is rotated again to extend the cantilever 7 inward. The trailer 8 moves on the cantilever 7 and places the new roller on the load trolley 2. The load trolley 2 transports the roller along the track 3 and quickly transports it to the roller changing position. The staff quickly disassembles the old roller and hoists it by the electric hoist 9. The trailer 8 moves on the cantilever 7 and places the old roller on the load trolley 2. The electric hoist 9 hoists the new roller. The trailer 8 moves on the cantilever 7 and hoists the new roller to the installation position to complete the installation, thereby improving the roller changing efficiency, reducing the downtime for roller changing, and effectively improving the efficiency of the paper machine.

[0020] Reference Figure 2 The trailer 8 includes a U-shaped bracket 81, which is provided with a rotating shaft 82, on which a plurality of rollers 83 are fixed. A servo motor 84 connected to the rotating shaft 82 is provided on the side of the U-shaped bracket 81, and an eyebolt 85 connected to the electric hoist 9 is provided at the bottom of the U-shaped bracket 81. The U-shaped bracket 81 is hung on the cantilever 7 via the rotating shaft 82, on which a plurality of rollers 83 are fixed. Under the action of the servo motor 84, the U-shaped bracket 81 can move along the cantilever 7.

[0021] The support frame 1 is an I-shaped frame with a more stable structure, which makes it less likely to roll over during hoisting and roller replacement. A rib plate 10 is provided at the connection between the hanger 4 and the cantilever 7. The rib plate 10 increases the strength of the connection between the hanger 4 and the cantilever 7 and improves the structural stability.

[0022] It should be understood that the specific embodiments described herein are only used to understand the present invention and are not used to limit the present invention. All other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of the present invention.

Claims

1. A roll changing device for a double-nip calender, characterized by: The invention comprises a support frame (1) and a load-carrying trolley (2), wherein the support frame (1) is provided with two rails (3) arranged in parallel and cooperating with the load-carrying trolley (2), the load-carrying trolley (2) is provided with a hanger (4), the bottom of the hanger (4) is rotatably connected to the load-carrying trolley (2) through a rotating bearing (5), the bottom of the load-carrying trolley (2) is provided with a rotating motor (6) connected to the hanger (4), the top of the hanger (4) is provided with a cantilever (7), the cantilever (7) is provided with a trailer (8), and the lower part of the trailer (8) is connected to an electric hoist (9).

2. A roll changing device for a double-nip calender according to claim 1, characterized in that: The trailer (8) includes a U-shaped bracket (81), a rotating shaft (82) is provided on the U-shaped bracket (81), a plurality of rollers (83) are fixed on the rotating shaft (82), and a servo motor (84) connected to the rotating shaft (82) is provided on the side of the U-shaped bracket (81).

3. The roll changing device for a double-nip calender according to claim 2, characterized in that: The bottom of the U-shaped hanger (81) is provided with an eyebolt (85) for connecting the electric hoist (9).

4. The roll changing device for a double-nip calender according to claim 3, characterized in that: A rib plate (10) is provided at the connection between the hanger (4) and the cantilever (7).

5. The roll changing device for a double-nip calender according to claim 4, characterized in that: The right end of the cantilever (7) is provided with a limiting frame (11).

6. The roll changing device for a double-nip calender according to claim 5, characterized in that: The support frame (1) is an I-shaped frame.

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