Lifting swing arm roll changing device and roll coating unit

Abstract

The present invention relates to a lifting swing arm roll changing device, which comprises a roll changing machine frame, two swing arms, a lifting drive mechanism and a swing drive mechanism. A supporting part adapted to support a roll shaft is provided on the swing arms; the two swing arms can swing in a horizontal plane and have a swing arm working position where they swing out of the roll changing machine frame and a swing arm standby position where they are built in the roll changing machine frame; the two swing arms and the swing drive mechanism are driven to lift together by the lifting drive mechanism, or the two swing arms and the lifting drive mechanism are driven to swing together by the swing drive mechanism. By arranging the above-mentioned lifting swing arm roll changing device beside the equipment with roll changing requirements, with the support of the swing arms, the roll changing operation can be conveniently and quickly assisted, effectively reducing the difficulty of the roll changing operation for maintenance personnel, reducing the workload of maintenance personnel and shortening the operation time.

Description

Technical Field

[0001] The present invention belongs to the technical field of metallurgical equipment, and particularly relates to a lifting swing arm roll changing device and a roll coating machine equipped with the lifting swing arm roll changing device. Background Art

[0002] In the production line of the metallurgical field, the rollers of equipment often need to be replaced, and the help of a traveling crane is often required during roll changing. For example, when replacing an old roll, the traveling crane needs to lift and hold the old roll to be replaced. After workers remove components such as the bearing housing, the traveling crane lifts away the old roll. Or when installing a roll, the traveling crane lifts a new roll / ground roll, lowers it to the installation height of the roll, and then disconnects the lifting rope of the roll after the workers install components such as the bearing housing. This roll changing method is time-consuming and laborious. Due to the limited number of traveling cranes in the factory building and the irregular occupation time, waiting for the traveling crane is often required during equipment roll changing, and sometimes it even takes several hours to start roll changing, directly affecting the roll changing efficiency and production rhythm. Moreover, the operation of the traveling crane requires the cooperation of workers up and down, and its lifting and other operating accuracies are relatively low, increasing the labor intensity of workers and the danger of operation. Summary of the Invention

[0003] The present invention relates to a lifting swing arm roll changing device and a roll coating machine equipped with the lifting swing arm roll changing device, which can at least solve some defects of the prior art.

[0004] The present invention relates to a lifting swing arm roll changing device, including a roll changing frame, two swing arms, a lifting drive mechanism and a swing drive mechanism. A supporting part adapted to hold a roll shaft is provided on the swing arm.

[0005] Both of the two swing arms and the swing drive mechanism are arranged on a lifting platform, the lifting platform is connected to the output end of the lifting drive mechanism, and the two swing arms are respectively connected to the swing drive mechanism so as to be able to swing in a horizontal plane and have a swing arm working position outside the roll changing frame and a swing arm standby position inside the roll changing frame.

[0006] Alternatively, each swing arm is configured with a set of lifting drive mechanisms and the two are arranged on the same swing seat. The two swing seats are respectively connected to the swing drive mechanism so as to be able to swing in a horizontal plane and enable the swing arm to have a swing arm working position outside the roll changing frame and a swing arm standby position inside the roll changing frame.

[0007] As one of the embodiments, the swing drive mechanism includes a swing drive motor and two sets of worm and worm gear assemblies. The swing drive motor is a double-shaft extension motor. Two worms are respectively connected to the two output shafts of the swing drive motor. Support shafts are respectively provided on two worms, and the two swing arms are respectively installed on the two support shafts.

[0008] As one of the implementation manners, the swing drive mechanism includes a swing drive motor and two sets of bevel gear assemblies. The swing drive motor is a double-shaft extension motor. Each set of bevel gear assemblies includes two meshing bevel gears. One of the bevel gears is provided with a support shaft and the other bevel gear is provided with a transmission shaft. The two transmission shafts are respectively connected to the two output shafts of the swing drive motor, and the two swing arms are respectively mounted on the two support shafts.

[0009] As one of the implementation manners, the supporting part is a V-shaped saddle.

[0010] As one of the implementation manners, when the two swing arms and the swing drive mechanism are both arranged on the lifting platform, a guiding mechanism for guiding the lifting movement of the lifting platform is provided on the roll changing frame.

[0011] As one of the implementation manners, the lifting swing arm roll changing device further includes a roll body storage table arranged beside the roll changing frame. The roll body storage table is arranged between the projections of the working positions of the two swing arms on the workshop platform.

[0012] As one of the implementation manners, the roll body storage table has a traveling mechanism or a lifting part suitable for being lifted by a crane.

[0013] The present invention also relates to a roll coating unit, including a roll coater. The roll changing area of the roll coater is provided with the lifting swing arm roll changing device as described above.

[0014] The present invention has at least the following beneficial effects:

[0015] By arranging the above-mentioned lifting swing arm roll changing device beside the equipment with roll changing requirements, with the assistance of the supporting function of the swing arm, the roll changing operation can be conveniently and quickly completed, effectively reducing the difficulty of the roll changing operation for maintenance personnel, reducing the workload of maintenance personnel and shortening the operation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic side view structure diagram of the lifting swing arm roll changing device provided by the embodiment of the present invention;

[0018] Figure 2 It is a schematic front view structure diagram of the lifting swing arm roll changing device provided by the embodiment of the present invention;

[0019] Figure 3 ForFigure 2 Cross-sectional view along A-A;

[0020] Figure 4 Schematic structural diagram of the single-roll coater provided by the embodiment of the present invention;

[0021] Figure 5 is Figure 4 Cross-sectional view along A-A;

[0022] Figure 6 is Figure 4 Cross-sectional view along B-B. Specific embodiments

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] Embodiment 1

[0025] As Figures 1-3 , the embodiment of the present invention provides a lifting swing arm roll-changing device, including a roll-changing machine frame 11, two swing arms 12, a lifting drive mechanism 14 and a swing drive mechanism. A supporting portion adapted to hold the roll shaft is provided on the swing arm 12. The lifting drive mechanism 14 is used to adjust the position of the swing arm 12 in the vertical direction, and the swing drive mechanism is used to adjust the position of the swing arm 12 in the horizontal plane. Through the cooperation of the two, the spatial position of the swing arm 12 can be accurately positioned.

[0026] In one embodiment, as Figure 1 and Figure 2 , the two swing arms 12 and the swing drive mechanism are both arranged on the lifting platform 13. The lifting platform 13 is connected to the output end of the lifting drive mechanism 14. The two swing arms 12 are respectively connected to the swing drive mechanism so as to be able to swing in the horizontal plane and have a swing arm working position 12B outside the roll-changing machine frame 11 and a swing arm standby position 12A inside the roll-changing machine frame 11; the lifting platform 13 can drive the two swing arms 12 and the swing drive mechanism to lift together. In another embodiment, each swing arm 12 is configured with a set of lifting drive mechanisms 14 and the two are arranged on the same swing seat. The two swing seats are respectively connected to the swing drive mechanism so as to be able to swing in the horizontal plane and make the swing arm 12 have a swing arm working position 12B outside the roll-changing machine frame 11 and a swing arm standby position 12A inside the roll-changing machine frame 11; the swing seat can drive the two swing arms 12 and the lifting drive mechanism 14 to swing together.

[0027] In this embodiment, the first method is adopted, that is, the two swing arms 12 and the swing drive mechanism are both arranged on the lifting platform 13, and the required moving space is relatively small. Further, as Figures 1-3 , a guiding mechanism 15 for guiding the lifting movement of the lifting platform 13 is provided on the roll changing frame 11, which can improve the movement stability of the lifting platform 13; the guiding mechanism 15 can adopt a conventional slider-rail matching type guiding structure, a roller-rail matching type guiding structure, etc., which will not be elaborated here.

[0028] The above-mentioned lifting drive mechanism 14 can adopt conventional lifting drive devices, such as cylinders, hydraulic cylinders, electric push rods, etc., or adopt a structural form of a motor + transmission structure, such as using a motor to drive a screw lift or a drum, etc., which will not be elaborated one by one here. For the case where the lifting drive mechanism 14 drives the lifting platform 13 to move, multiple sets of lifting drive devices can be configured to improve the movement stability of the lifting platform 13.

[0029] The above-mentioned swing drive mechanism can adopt a conventional rotary drive device; the two swing arms 12 can be independently driven to swing, that is, two sets of independent swing drive mechanisms are used to drive the two swing arms 12 respectively, or the two swing arms 12 can be driven to swing synchronously by one set of swing drive mechanism. In one embodiment, the swing drive mechanism includes a swing drive motor 161 and two sets of worm and worm gear assemblies. The swing drive motor 161 is a double-shaft extension motor. Two worms 162 are respectively connected to the two output shafts of the swing drive motor 161. Two support shafts are respectively provided on two worms 163, and the two swing arms 12 are respectively installed on the two support shafts; in another embodiment, the swing drive mechanism includes a swing drive motor 161 and two sets of bevel gear assemblies. The swing drive motor 161 is a double-shaft extension motor. Each set of bevel gear assemblies includes two meshing bevel gears. A support shaft is provided on one of the bevel gears and a transmission shaft is provided on the other bevel gear. The two transmission shafts are respectively connected to the two output shafts of the swing drive motor 161, and the two swing arms 12 are respectively installed on the two support shafts. Driving the two swing arms 12 to swing by one set of swing drive mechanism can not only save the number of devices, but also ensure the coordination of the actions of the two swing arms 12; in particular, driving one swing arm 12 to make a clockwise swing movement and the other swing arm 12 to make a counterclockwise swing movement, that is, the distance between the two swing arms 12 is the smallest when they are in the swing arm standby position 12A. As the swing movement of the two progresses, the distance between them gradually increases, which is suitable for adjusting the opening between the two swing arms 12 according to factors such as the roll length, etc., and the synchronous swing of the two swing arms 12 is beneficial to ensuring the accuracy of the above-mentioned opening adjustment.

[0030] The above-mentioned supporting part is preferably a trough-shaped structure to stably and reliably support the roll shaft; in one embodiment, as Figure 1 and Figure 2, the supporting part is a V-shaped saddle; of course, it is also a feasible solution to adopt an upward-opening arc groove or rectangular groove, etc. Further preferably, the saddle is rotatably arranged on the swing arm 12 and its rotating shaft is parallel to the vertical direction. A saddle rotation driving unit can be arranged on the swing arm 12. For example, a motor + transmission structure is used to drive the rotation of the saddle. The transmission structure can adopt a chain transmission structure, a gear transmission structure, a pulley transmission structure, etc., which will not be elaborated here. Further, an encoder can be configured for the motor of the saddle rotation driving unit; based on this structure, the swing angles of the two swing arms 12 (i.e., the opening degree between the two swing arms 12) can be controlled to adapt to the replacement operation of rollers with different lengths, and the above saddle is driven to rotate by the saddle rotation driving unit to ensure that the corresponding roller can be reliably supported. Optionally, the above-mentioned roll-changing device is designed as a movable skid-mounted structure (for example, the roll-changing rack 11 is arranged on a roll-changing trolley), so that a set of roll-changing device can meet the roll-changing requirements of multiple devices, effectively reducing the number of maintenance devices and lowering the cost.

[0031] Further preferably, as Figures 1-3 , the above-mentioned lifting swing arm roll-changing device further includes a roller storage table 17 arranged beside the roll-changing rack 11. The roller storage table 17 is arranged between the projections of the two swing arm working positions 12B on the workshop platform, that is, the length of the roller storage table 17 is less than the distance between the two swing arm working positions 12B. For example, the length of the roller storage table 17 is approximately the same as the length of the roller body of the roller. When the roller is placed on the roller storage table 17, the two end roller shafts of the roller can extend out of the roller storage table 17 and can contact the above-mentioned swing arm 12. The roller storage table 17 is also provided with a storage part, and the storage part can adopt the form of a V-shaped saddle, etc. The roller storage table 17 can be fixedly installed on the workshop platform; in a preferred solution, the roller storage table 17 has a traveling mechanism or a lifting part suitable for being lifted by a crane, which is more convenient for the roll-changing operation.

[0032] The specific implementation steps of using the above roll-changing device for roll-changing operation include:

[0033] (1) When removing the roller, at an appropriate height position, swing the two swing arms 12 to reach a preset opening degree, then raise the swing arms 12 to the target position so that the two swing arms 12 support the roller shaft;

[0034] After the components such as the bearing seat of the roller are removed, the two swing arms 12 can be lowered, and the removed roller can be placed on the roller storage table 17;

[0035] The two swing arms 12 can be further swung to avoid the roller shaft, or the roller body storage table 17 can be moved to move the roller shaft away from the area directly above the swing arms 12, as long as the interference between the roller shaft and the lifting movement of the swing arms 12 can be avoided; then the swing arms 12 are lifted or lowered to a suitable height position and the swing arms 12 are returned to the swing arm standby position 12A; when the overhead crane in the workshop is convenient, come to lift away the roller body storage table 17 or the rollers on the roller body storage table 17.

[0036] (2) When installing the rollers, just operate in the reverse manner as described above, which will not be elaborated here.

[0037] From the process of removing and installing the rollers, it can be seen that the maintenance personnel do not have to waste time waiting for the overhead crane, improving the roll changing efficiency. At the same time, in special cases, the two swing arms 12 need to avoid other equipment or components to contact and support the rollers. At this time, only by increasing or decreasing the opening degree between the two swing arms 12 can the avoidance be carried out conveniently and flexibly, increasing the adaptability of the above roll changing device to the equipment and environment.

[0038] Embodiment 2

[0039] An embodiment of the present invention provides a roll coating unit, including a roll coater, and a lifting swing arm roll changing device provided in the roll changing area of the roll coater as described in Embodiment 1 above.

[0040] Embodiment 3

[0041] An embodiment of the present invention provides a single-roll coating machine, which can be used as the roll coater in Embodiment 2 above.

[0042] As Figures 4-5 , the single-roll coating machine includes a coating machine frame 21, an upper coating roll 222 and a lower coating roll 232, and further includes an upper roll frame 221, an upper lifting mechanism 223 arranged at the top of the coating machine frame 21 and used to drive the upper roll frame 221 to lift and lower, a lower roll frame 231, and a lower lifting mechanism 233 arranged at the bottom of the coating machine frame 21 and used to drive the lower roll frame 231 to lift and lower; the bearing seat of the upper coating roll 222 is slidably arranged on the upper roll frame 221 and the sliding direction is parallel to the axial direction of the upper coating roll body 2221; the bearing seat of the lower coating roll 232 is slidably arranged on the lower roll frame 231 and the sliding direction is parallel to the axial direction of the lower coating roll body 2321; a roll changing channel for the upper coating roll 222 and the lower coating roll 232 to pass through is provided on the driving side frame body 211 and / or the operating side frame body 212 of the coating machine frame 21.

[0043] The coating machine frame 21 is fixedly installed on the workshop platform, and its cross-section perpendicular to the running direction of the strip is in a portal or rectangular shape. It can be understood that when the coating machine frame 21 has no bottom plate, it is in a portal shape, and the two side frames (the drive side frame 211 and the operation side frame 212) of the coating machine frame 21 are directly installed on the workshop platform; when the coating machine frame 21 has a bottom plate, it is in a rectangular shape, the bottom plate is installed on the workshop platform, and the drive side frame 211 and the operation side frame 212 of the coating machine frame 21 are supported on the bottom plate. The strip passes between the drive side frame 211 and the operation side frame 212 of the coating machine frame 21. The above-mentioned drive side frame 211 and operation side frame 212 are connected by a top plate, which can ensure the structural strength and working stability of the coating machine frame 21.

[0044] In one embodiment, as Figure 4 , both the drive side frame 211 and the operation side frame 212 are portal frames. It can be understood that the portal frame is perpendicular to the axis of the upper coating roller body 2221 / the axis of the lower coating roller body 2321. The space area defined by the portal frame can be used as the inlet and outlet of the above-mentioned upper coating roller 222 and lower coating roller 232, that is, it can form the above-mentioned roll changing channel; during roll changing, the old / new roll passes through the door of the operation side frame 212, that is, through between the two door columns of the operation side frame 212. The portal frame can ensure the structural strength of the frame body, and at the same time ensure sufficient space required for operations such as roll changing, which is convenient for roll changing operations, and the upper coating roller 222 and the lower coating roller 232 can pass through smoothly. The drive side frame 211 also adopts a portal frame. On the one hand, it provides more maintenance space for the coating machine. For example, when changing rolls, the old / new roll has more movable surplus space. On the other hand, it is convenient for the staff to more intuitively observe the production process and the equipment status, and it is also more conducive to the connection between the drive side equipment and the component equipment inside the coating machine. For example, the connection between the upper lifting mechanism 223, the lower lifting mechanism 233, the coating liquid spray head 24, etc. and external equipment.

[0045] The above-mentioned upper lifting mechanism 223 and lower lifting mechanism 233 can adopt conventional lifting drive equipment, such as hydraulic cylinders, air cylinders, screw jacks, winches, etc. The specific structure will not be elaborated here. Preferably, as Figure 4 and Figure 5, both the drive side frame body 211 and the operation side frame body 212 are provided with an upper guiding unit 251 for guiding the lifting movement of the upper roller frame 221; and / or, both the drive side frame body 211 and the operation side frame body 212 are provided with a lower guiding unit 252 for guiding the lifting movement of the lower roller frame 231. By providing the guiding unit, the stability and reliability of the lifting movement of the upper roller frame 221 and the lower roller frame 231 can be improved, thereby improving the coating quality. The above-mentioned upper guiding unit 251 and lower guiding unit 252 can adopt a conventional slider-rail matching type guiding structure or a roller-groove rail matching type guiding structure.

[0046] For the structures where both the above-mentioned drive side frame body 211 and operation side frame body 212 are portal frames, such as Figure 4 , it is preferably to set the slide rails / groove rails of the upper guiding unit 251 and the lower guiding unit 252 on the inner edges of the portal columns. That is, a set of tracks are provided on each of the two portal columns of the drive side frame body 211, and a set of tracks are provided on each of the two portal columns of the operation side frame body 212. The two sets of tracks on each side frame are arranged oppositely; taking the slider-rail matching type guiding structure as an example, the sliding surface of the slider is parallel to the vertical direction and perpendicular to the axial direction of the upper coating roller body 2221; taking the roller-groove rail matching type guiding structure as an example, the axial direction of the roller is parallel to the axial direction of the upper coating roller body 2221. Based on the above structure, the equipment layout of the coating machine can be made more compact, the volume and occupied space of the coating machine frame 21 can be significantly reduced, and moreover, due to the limitation of the two-side portal frames, the lifting movements of the upper roller frame 221 and the lower roller frame 231 are more stable, thereby effectively improving the strip coating quality and extending the service life of the coating machine

[0047] Continuing with the structure of the above single-roller coating machine, such as Figures 4-6 , the upper roller frame 221 is provided with a first horizontal guiding unit for guiding the sliding movement of the upper coating roller 222; and / or, the lower roller frame 231 is provided with a second horizontal guiding unit for guiding the sliding movement of the lower coating roller 232. Similarly, the first horizontal guiding unit and the second horizontal guiding unit can adopt a conventional slider-rail matching type guiding structure or a roller-groove rail matching type guiding structure. By providing the horizontal guiding unit, the stability of the translational movement of the upper coating roller 222 and the lower coating roller 232 can be improved, facilitating the roll change operation and ensuring the installation accuracy of the upper coating roller 222 and the lower coating roller 232. Optionally, a guiding cross beam 26 is provided on the upper roller frame 221, and the slide rails / groove rails, etc. can be formed on the guiding cross beam 26; the guiding cross beam 26 is preferably extended outside the operation side frame body 212 to facilitate the roll change operation; similarly, a guiding cross beam 26 can also be provided on the lower roller frame 231.

[0048] Continuing with the structure of the above single-roll coater, both the upper roll frame 221 and the lower roll frame 231 are provided with a roll locking mechanism for restricting the sliding of the corresponding coating roll. This roll locking mechanism is used to lock the coating roll on the corresponding roll frame to ensure that the coating roll can work reliably during normal production. At the same time, this roll locking mechanism also needs to be able to release the above locking state to facilitate roll changing operations. In one embodiment, the roll locking mechanism includes a locking card plate 28 hinged on the corresponding roll frame, and a limiting groove cooperating with the locking card plate 28 is provided at the end of the roller shaft of the corresponding coating roll or on the bearing seat of the corresponding coating roll. By inserting the locking card plate 28 into the above limiting groove, the coating roll can be locked on the corresponding roll frame. After the locking card plate 28 leaves the limiting groove, operations such as roll changing can be carried out.

[0049] In an alternative embodiment, as Figure 4 , a pressure detection unit 224 is installed between the output end of the upper lifting mechanism 223 and the upper roll frame 221. The pressure detection unit 224 can be a pressure sensor, etc.; through the feedback of this pressure detection unit 224, the force of mutual extrusion between the upper coating roll body 2221 and the lower coating roll body 2321 can be controlled to obtain a coating quality that meets the requirements.

[0050] In an alternative embodiment, a buffer unit 234 is clamped between the output end of the lower lifting mechanism 233 and the lower roll frame 231; preferably, as Figure 4 and Figure 5 , the buffer unit 234 includes a plurality of buffer springs, and the axial directions of the buffer springs are all parallel to the vertical direction. Based on the above design, a relatively stable contact pressure is maintained between the lower coating roll 232 and the strip steel, which can realize flexible coating of the strip steel and improve the uniformity of the strip steel coating thickness. At the same time, the above buffer unit 234 can also better absorb the vibration transmitted by the lower coating roll 232, avoiding damage to the strip steel and coating roll caused by sudden increase in the acting force between the strip steel and the lower coating roll 232 due to factors such as strip steel shape.

[0051] In an alternative embodiment, the pressure detection unit 224 and the buffer unit 234 can be interchanged.

[0052] Continuing with the structure of the above single-roll coater, as Figures 4-6 , a coating liquid collection tank 271 is arranged below the lower roll frame 231. The coating liquid collection tank 271 is equipped with a translation guide rail 272, and the guiding direction of the translation guide rail 272 is parallel to the strip steel running direction and extends outside the coater frame 21. This coating liquid collection tank 271 is used to collect the coating liquid dripping during normal production. Through the above translation guide rail 272, the coating liquid collection tank 271 can be moved out of the range of the coater frame 21, facilitating the cleaning of the coating liquid collection tank 271.

[0053] Obviously, the above-mentioned lifting swing arm roll changing device is arranged on the operating side of the single-roll coater, and can assist in completing the roll changing operations of the upper coating roll 222 and the lower coating roll 232.

[0054] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A roll coating unit, comprising a roll coater, characterized in that: A roll-changing area of the roll coater is provided with a lifting swing arm roll-changing device. The lifting swing arm roll-changing device includes a roll-changing machine frame, two swing arms, a lifting drive mechanism, and a swing drive mechanism. A supporting portion adapted to hold a roll shaft is provided on the swing arm. The two swing arms and the swing drive mechanism are both arranged on a lifting table. The lifting table is connected to an output end of the lifting drive mechanism. The two swing arms are respectively connected to the swing drive mechanism so as to be able to swing in a horizontal plane and have a swing arm working position outside the roll-changing machine frame and a swing arm standby position inside the roll-changing machine frame. Alternatively, each swing arm is configured with a set of lifting drive mechanisms and the two are arranged on the same swing seat. The two swing seats are respectively connected to the swing drive mechanism so as to be able to swing in a horizontal plane and enable the swing arms to have a swing arm working position outside the roll-changing machine frame and a swing arm standby position inside the roll-changing machine frame. The roll coater includes a roll coater frame, an upper coating roll, and a lower coating roll. The roll coater frame is fixedly installed on a workshop platform and its cross-section perpendicular to the running direction of the strip is in a portal shape or a rectangular shape. The roll coater further includes an upper roll stand, an upper lifting mechanism arranged at the top of the roll coater frame and used to drive the upper roll stand to lift, a lower roll stand, and a lower lifting mechanism arranged at the bottom of the roll coater frame and used to drive the lower roll stand to lift. A bearing seat of the upper coating roll is slidably arranged on the upper roll stand and the sliding direction is parallel to the axial direction of the upper coating roll body. A bearing seat of the lower coating roll is slidably arranged on the lower roll stand and the sliding direction is parallel to the axial direction of the lower coating roll body. A roll-changing channel for the upper coating roll and the lower coating roll to pass through is provided on a driving side frame body and / or an operating side frame body of the roll coater frame. A first horizontal guiding unit for guiding the sliding movement of the upper coating roll is provided on the upper roll stand; and / or, a second horizontal guiding unit for guiding the sliding movement of the lower coating roll is provided on the lower roll stand. Coating roll locking mechanisms for restricting the sliding of the corresponding coating rolls are provided on both the upper roll stand and the lower roll stand. The coating roll locking mechanism includes a locking clamping plate hinged on the corresponding roll stand, and a limiting groove cooperating with the locking clamping plate is provided at an end of the roll shaft of the corresponding coating roll or on the bearing seat of the corresponding coating roll. A coating liquid collecting tank is arranged below the lower roll stand. The coating liquid collecting tank is configured with a translation guide rail, and the guiding direction of the translation guide rail is parallel to the running direction of the strip and extends outside the roll coater frame.

2. The roll coating unit according to claim 1, wherein: The swing drive mechanism includes a swing drive motor and two sets of worm and worm gear assemblies. The swing drive motor is a double-shaft extension motor. Two worms are respectively connected to two output shafts of the swing drive motor. Support shafts are respectively provided on two worms, and two swing arms are respectively installed on the two support shafts.

3. The roll coating unit according to claim 1, characterized in that: The swing drive mechanism includes a swing drive motor and two sets of bevel gear assemblies. The swing drive motor is a double-shaft extension motor. Each set of bevel gear assemblies includes two meshing bevel gears. A support shaft is provided on one of the bevel gears and a transmission shaft is provided on the other bevel gear. The two transmission shafts are respectively connected to two output shafts of the swing drive motor, and two swing arms are respectively installed on the two support shafts.

4. The roll coating unit according to claim 1, characterized in that: The supporting portion is a V-shaped saddle.

5. The roll coating unit according to claim 1, characterized in that: When both of the two swing arms and the swing drive mechanism are arranged on the lifting table, a guiding mechanism for guiding the lifting movement of the lifting table is provided on the roll changing frame.

6. The roll coating unit according to claim 1, characterized in that: It further includes a roll body storage table arranged beside the roll changing frame, and the roll body storage table is arranged between the projections of the working positions of the two swing arms on the workshop platform.

7. The roll coating unit according to claim 6, characterized in that: The roll body storage table is provided with a traveling mechanism or a lifting part suitable for being lifted by a crane.

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