Roll changing mechanism

Abstract

A roll changing mechanism includes a first material reel and a second material reel, wherein the first material reel and / or the second material reel are used to sleeve a plurality of material reels, and when one of the first material reel and the second material reel is a material unwinding reel, the other is a material preparation reel. When the material unwinding reel is at a unwinding station and the unwinded old material reel is about to be used up, a new material reel at the unwinding station on the material preparation reel is connected to the material belt of the old material reel so that the material preparation reel becomes a new material unwinding reel, thereby improving the roll changing efficiency.

Description

Technical Field

[0001] The invention relates to a roll changing mechanism, belonging to the technical field of automation equipment. Background Art

[0002] In the battery production process, coils are often needed, such as pole pieces, diaphragms and other materials. They are usually used in the form of coils, and are fed into the machine after the material reel rotates and unloads. When the material roll is used up, the spare roll needs to be started to complete the roll change. The existing automatic roll-changing mechanism mostly uses two sets of left and right suction cups to absorb the materials of the material roll and the spare roll, and then cut and connect the materials. This roll-changing mechanism has a complex structure and occupies a large space. When connecting the materials, it is also necessary to prepare tape to fit the tail of the old roll and the head of the new roll. There are many action processes, and the roll change is troublesome and inefficient. At the same time, only one set of spare rolls can be reserved, and a new roll needs to be replaced after each roll change. The reserve material is insufficient and the roll change efficiency is low. Summary of the invention

[0003] The object of the present invention is to provide a roll changing mechanism with higher roll changing efficiency.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a roll changing mechanism, which includes a first material reel and a second material reel, the first material reel and / or the second material reel are used to sleeve multiple material rolls, when one of the first material reel and the second material reel is a unwinding shaft, the other is a preparation shaft; when the unwinding shaft is in an unwinding position and the old material roll that has been unwound is about to be used up, the new material roll on the preparation shaft that is in the unwinding position is connected to the material belt of the old material roll to make the preparation shaft become a new unwinding shaft.

[0005] As a further improved technical solution of the present invention, when the old material roll on the unwinding shaft is about to be used up, the new material roll on the preparation shaft is connected to the material strip released from the old material roll through the tape; the roll changing mechanism includes a roller assembly, the roller assembly includes a first roller, a second roller and a roller driving device for driving the first roller and / or the second roller to move closer to or away from each other; the tape is located at the starting end of the new material roll on the preparation shaft, and when the old material roll on the unwinding shaft is about to be used up, the roller driving device drives the first roller and the second roller to move closer to each other so as to stick the tape to the material strip released from the old material roll on the unwinding shaft.

[0006] As a further improved technical solution of the present invention, the material roll includes a first material roll sleeved on the first material roll shaft and a second material roll sleeved on the second material roll shaft; the roll changing mechanism includes a first passing roller cooperating with the first material roll and a second passing roller cooperating with the second material roll.

[0007] As a further improved technical solution of the present invention, the roll changing mechanism includes a first cutting component for cutting the first material roll and a second cutting component for cutting the second material roll.

[0008] As a further improved technical solution of the present invention, the first passing roller and / or the second passing roller includes a roller shaft and a plurality of rollers sleeved on the roller shaft, the rollers correspond one-to-one to the corresponding material rolls, and each roller can rotate independently around the roller shaft.

[0009] As a further improved technical solution of the present invention, the first material reel and / or the second material reel comprises a plurality of shaft segments, each material reel is sleeved on a corresponding shaft segment, and each shaft segment is driven to rotate by an independent driving device without interfering with each other.

[0010] As a further improved technical solution of the present invention, the first material reel and / or the second material reel comprises a material reel drive device, a mounting shaft, a barrel, a fixing assembly and a linkage assembly, wherein the material reel drive device is connected to and drives the mounting shaft to rotate; a plurality of barrels corresponding to the material reels are arranged at intervals on the mounting shaft, and the material reels are sleeved on the corresponding barrels; the barrel is rotatably arranged on the mounting shaft; the fixing assembly is used to fix the relative position of the material reel and the mounting shaft; and the linkage assembly is used to link the corresponding material reel and the mounting shaft to rotate together.

[0011] As a further improved technical solution of the present invention, the barrel is rotatably arranged on the mounting shaft through a bearing, and the bearing includes an inner ring bearing and an outer ring bearing. The inner ring bearing rotates relative to the mounting shaft, and the outer ring bearing does not rotate relative to the inner ring bearing when the linkage assembly is not working.

[0012] As a further improved technical solution of the present invention, when the unwinding shaft carrying the old material roll becomes the preparation shaft, the preparation roll prepared for the next replacement on the shaft that becomes the preparation shaft is transferred to the unwinding station and is opposite to the material roll being unwound.

[0013] As a further improved technical solution of the present invention, the roll changing mechanism also includes a displacement driving device, which drives the unwinding shaft to move forward or backward at the same time, so that the next spare preparation roll reaches the unwinding station where the original old roll is located.

[0014] Compared with the prior art, the first material reel and / or the second material reel of the present invention are both used to sleeve a plurality of material rolls, thereby reducing the material preparation frequency and improving the roll changing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view of the roll changing mechanism of the present invention.

[0016] Figure 2 yes Figure 1 Left view of .

[0017] Figure 3 yes Figure 1 The main view of the roll changing mechanism when the roll on the unwinding shaft is about to run out.

[0018] Figure 4 It is a schematic diagram of an unwinding shaft and an unwinding drive device.

[0019] Figure 5 yes Figure 4 Schematic cross-section of the unwinding drive device in the middle section.

[0020] Figure 6 It is a schematic diagram of an unwinding shaft and an unwinding drive device in another embodiment. DETAILED DESCRIPTION

[0021] Please refer to Figures 1 to 6 As shown, the present invention discloses a roll changing mechanism, which includes a first material roll shaft 1, a second material roll shaft 2, a first passing roller 3, a second passing roller 4, a roller assembly 5, a first cutting assembly 6 and a second cutting assembly 7. The first passing roller 3 and the second passing roller 4 are respectively located at the discharge ends of the first material roll shaft 1 and the second material roll shaft 2.

[0022] The first material reel 1 and the second material reel 2 are used together, and when one of them is the unwinding shaft, the other is the preparation shaft. Figure 2 As shown, in order to avoid frequent material preparation, multiple groups of material rolls can be stored on the first material reel 1 and / or the second material reel 2, wherein multiple groups means more than or equal to two groups. Preferably, multiple groups of material rolls are stored on both the first material reel 1 and the second material reel 2.

[0023] In order to more clearly describe the specific implementation mode of the present invention, the roll on the unwinding shaft that is in the unwinding station and has been unwound is called the old roll; the roll on the preparation shaft that is in the unwinding station and is ready to replace the old roll is called the new roll; the other rolls on the unwinding shaft and the preparation shaft are called preparation rolls. When the old roll on the unwinding shaft is about to run out, it is necessary to change the roll, and the new roll on the preparation shaft that is in the unwinding station is connected to the tape released by the old roll, and the old roll is separated from the tape released by the old roll, so that the old roll can be replaced. In this way, the new roll replaces the old roll that is about to run out, and correspondingly, the original unwinding shaft carrying the old roll becomes the preparation shaft, and the original preparation shaft carrying the new roll becomes the unwinding shaft. After the new roll is connected to the tape, the unwinding shaft rotates to unwind. When the machine is moving the tape, the old tape pulls the new tape, and actively brings the new tape into various mechanisms of the machine to start a new round of action. Please refer to Figure 1As shown, except for the old material roll, the starting ends of the new material roll and the reserve material roll are all adhered with tape 8, and the ends of the tape 8 are correspondingly adhered to the first passing roller 3 and the second passing roller 4. In one embodiment of the present invention, when the unwinding shaft rotates to unwind, the reserve material shaft does not move. In the illustrated embodiment of the present invention, when the old material roll on the unwinding shaft is about to be used up, the new material roll on the reserve material shaft is connected to the material tape released by the old material roll through the tape 8, thereby realizing the roll replacement.

[0024] The material roll includes a first material roll 11 sleeved on the first material roll shaft 1 and a second material roll 21 sleeved on the second material roll shaft 2. The first over-roller 3 is used to cooperate with the first material roll 11 to guide and support the conveyance of the material tape on the first material roll 11. When the first material roll shaft 1 is a material unwinding shaft, the material tape unwinded from the first material roll 11 includes a material segment 111 wound around the first over-roller 3, and the material segment 111 is located between the first material roll 11 and the first over-roller 3. Similarly, the second over-roller 4 is used to cooperate with the second material roll 21 to guide and support the conveyance of the material tape on the second material roll 21.

[0025] The supporting roller assembly 5 includes a first supporting roller 51, a second supporting roller 52, and a supporting roller driving device (not shown) for driving the first supporting roller 51 and / or the second supporting roller 52 to move toward or away from each other. Figure 2 As shown, in one embodiment of the present invention, the supporting roller driving device includes two sets of driving, which are respectively connected and drive the first supporting roller 51 and the second supporting roller 52 to move toward each other. Specifically, the supporting roller driving device includes a supporting roller driving member (such as a motor or a cylinder, preferably a cylinder) and a supporting roller guide member 53 (such as a guide rail) arranged toward the material section 111, wherein the first supporting roller 51 and / or the second supporting roller 52 are slidably connected to the supporting roller guide member 53, and the supporting roller driving member is connected and drives the first supporting roller 51 and / or the second supporting roller 52 to move along the supporting roller guide member 53.

[0026] The first cutting assembly 6 and the second cutting assembly 7 both include a cutter and a cutter driving device (not shown), wherein the cutter driving device is used to drive the cutter to approach or move away from the corresponding material belt. When the cutter driving device drives the cutter to approach the corresponding material belt, the cutter cuts the material belt released by the unwinding shaft. Figure 1 As shown, in the illustrated embodiment of the present invention, the first cutting assembly 6 and the second cutting assembly 7 are respectively disposed below the first passing roller 3 and the second passing roller 4. Figure 2As shown, in one embodiment of the present invention, the cutter driving device includes a cutter driving member (such as a motor or a cylinder, preferably a cylinder) and a cutter guide 63 (such as a guide rail) arranged toward the material section 111, wherein the cutter is slidingly connected to the cutter guide 63, and the cutter driving member is connected to and drives the cutter to move along the cutter guide 63.

[0027] Please refer to Figure 1 and Figure 3 As shown, in order to more specifically describe the roll-changing principle of the present invention, the first material reel 1 is used as the unwinding reel and the second material reel 2 is used as the preparation reel. Figure 3 As shown, when the old roll unwound on the first material reel 1 is about to be exhausted and ready to be replaced, the first material reel 1 stops rotating to unwind, and the supporting roller driving device drives the first supporting roller 51 and the second supporting roller 52 to approach each other to clamp the material segment 111 unwound from the old roll; accordingly, the new roll to be connected on the second material reel 2 has a material segment 211 adhered to the second passing roller 4. The material segment 211 is attached with an adhesive tape 8 and the adhesive surface of the adhesive tape 8 faces the material segment 111. When the first supporting roller 51 and the second supporting roller 52 abut against each other, they clamp the material segment 111 and the material segment 211, so that the adhesive tape 8 adheres to the material segment 111. At this time, the cutter driving device of the first cutting component 6 drives the cutter to approach and cut the material segment 111, so that the old material roll on the first material reel 1 is separated from the material segment 111 entering the machine, so as to facilitate the transfer of the old material roll; and the head end of the new material roll of the second material reel 2 is adhered to the material segment 111. When the machine restarts the tape, the material tape of the new material roll on the second material reel 2 enters the machine along with the material segment 111, so as to realize material splicing and roll changing.

[0028] For details, please refer to Figure 2 As shown, the first over-roller 3 and / or the second over-roller 4 comprises a roller shaft 31 and a plurality of rollers 32 sleeved on the roller shaft 31, each roller 32 corresponds to a corresponding material roll one by one, and each roller 32 can independently rotate around the roller shaft 31. With such a configuration, when a roller 32 on the first over-roller 3 or the second over-roller 4 is used as a roller corresponding to the old material roll unwound on the unwinding shaft, the roller 32 will rotate with the material belt to guide and support the material belt, and the rotation of the material barrel 32 will not link other material barrels 32, so that the unwinding is orderly and controllable.

[0029] In another embodiment, a plurality of first passing rollers 3 and / or second passing rollers 4 may be provided, and each material roll is connected to a corresponding passing roller to achieve independent unwinding.

[0030] For details, please refer to Figure 4 and Figure 5As shown, in one embodiment of the present invention, the first material reel 1 and / or the second material reel 2 includes a plurality of shaft segments a, b, c, and each shaft segment a, b, c is driven to rotate by an independent driving device 112, 113, 114. Taking the first material reel 1 as an example, each first material roll 11 is sleeved on the corresponding shaft segment a, b, c; in this way, when a shaft segment a, b, c on the first material reel 1 needs to rotate to unload the material, the corresponding driving device 112, 113, 114 drives the shaft segment a, b, c to rotate, and the rotation of the shaft segment will not link other shaft segments, so as to ensure that each first material roll 11 does not interfere with each other.

[0031] Please refer to Figure 4 As shown, in the illustrated embodiment of the present invention, the driving devices 112, 113, 114 include a motor and a synchronous belt assembly 115, a driving wheel 116 is provided at the output end of the motor, and a driven wheel 117 is provided at one end of the shaft segments a, b, and c, and the driving wheel 116 and the driven wheel 117 are linked by a synchronous belt 118. Figure 5 As shown, the driven wheel 117 on the shaft section a is connected to the first material reel 1, so that the first material reel 1 can rotate under the drive of the driven wheel 117; two adjacent driven wheels 117 are separated by a spacer 1191; the corresponding driven wheel 117 is prevented from interfering with the adjacent sleeve shaft by the corresponding bearing 119, wherein the bearing 119 on the shaft section a is directly mounted on the first sleeve shaft 1192 of the shaft section b, and the bearing 119 on the shaft section b is directly mounted on the second sleeve shaft 1193 of the shaft section c. In the illustrated embodiment of the present invention, since the spacing between the driven wheels 117 is small, the above setting is used to prevent interference when the sleeve shaft is exposed less; of course, in other embodiments, the driven wheel 117 can also be directly connected to the corresponding shaft. When in action, the motor drives the driving wheel 116, which is driven by the synchronous belt 118 to drive the driven wheel 117 and the corresponding shaft sections a, b, and c to rotate, thereby driving the first material reel 11 correspondingly sleeved on the shaft sections a, b, and c to rotate and unload. Of course, the synchronous belt assembly 115 can also be replaced by a transmission mechanism such as gears, which can also achieve the purpose of transmission.

[0032] In another implementation, a group of motors can also be used. For example, a first gear is provided at the output end of the motor, and a second gear is provided at each shaft section a, b, and c. The first gear can be meshed with the second gear for transmission, and the motor can move toward the second gear direction to mesh with the first gear and the second gear, or separate the first gear and the second gear. When the second gear of the unwinding shaft section a, b, or c moves to the meshing position with the first gear, the motor, driven by an external driving device, brings the first gear close to the second gear, so that the two gears are meshed; the motor drives the first gear to drive the second gear and its corresponding shaft section to rotate, and release the material tape. After the unwinding is completed, the motor stops rotating, and the rotating shaft section stops rotating, so that the old material roll and the new material roll can start the tape connection and roll changing action. The motor drives the first gear away from the second gear under the drive of the external driving device. After the old material roll is cut, the second gear of the original unwinding shaft section leaves the meshing position, and the second gear of the corresponding shaft section of the next group of new material rolls moves to the meshing position, waiting for the next unwinding, and meshes with the first gear to rotate. In addition to the gear transmission, a clutch can also be used to achieve the rotation of the shaft section where the unwinding material roll is located driven by only one motor.

[0033] Please refer to Figure 6 As shown, in the embodiment of the unwinding shaft, in order to fix each group of prepared rolls and ensure that they do not interfere with each other during the unwinding process of the old roll, the first roll shaft 1 and / or the second roll shaft 2 include a mounting shaft 101, a barrel 102, a fixing assembly 103, a linkage assembly 104 and a roll shaft driving device (not shown). The following is only described by taking the first roll shaft 1 as an example: the roll shaft driving device is preferably a reduction motor, which is connected to and drives the mounting shaft 101 to rotate to achieve unwinding; a plurality of barrels 102 corresponding to the first roll 11 are arranged on the mounting shaft 101 at intervals, and the first roll 11 is sleeved on the corresponding barrel 102; the barrel 102 is rotatably arranged on the mounting shaft 101; the fixing assembly 103 is used to fix the relative position of the corresponding first roll 11 and the mounting shaft 101; the linkage assembly 104 is used to link the corresponding first roll 11 and the mounting shaft 101 to rotate together.

[0034] Specifically, the barrel 102 is rotatably disposed on the mounting shaft 101 through a bearing 106, and the bearing 106 includes an inner ring bearing 1061 and an outer ring bearing 1062, wherein the inner ring bearing 1061 is connected to the mounting shaft 101, and the outer ring bearing 1062 is connected to the barrel 102. After the fixing assembly 103 connects and fixes the first material roll 11 and the mounting shaft 101, when the material roll shaft driving device drives the mounting shaft 101 to rotate, the inner ring bearing 1061 rotates accordingly, while the outer ring bearing 1062 does not rotate relative to the inner ring bearing 1061 when the linkage assembly 104 is not in effect.

[0035] Specifically, the fixing assembly 103 is arranged in one-to-one correspondence with the barrel 102, and the fixing assembly 103 is arranged on the mounting shaft 101 or the barrel 102, and includes a fixing member and a driving member, and the output end of the driving member is connected to the fixing member to drive the fixing member to approach and connect the first material roll 11 to fix the position of the first material roll 11 and the mounting shaft 101 or the barrel 102, so that the first material roll 11 cannot move axially after being inserted into the mounting shaft 101, so as to facilitate docking with the old material roll on the unwinding shaft or the new material roll on the preparation shaft at the unwinding station when changing the roll. In one embodiment, the fixing assembly 103 includes a cylinder and a fixing block, wherein the main body of the cylinder is arranged on the mounting shaft 101 or the barrel 102, and the driving end of the cylinder is connected to the fixing block, and the cylinder can drive the fixing block to extend into the first material roll 11 or block the position of the material roll to fix the first material roll 11. Of course, in other embodiments, the fixing assembly 103 may also include an air gripper and a clamp, wherein the air gripper drives the clamp to open or close to clamp or release the first material roll 11 .

[0036] Specifically, the linkage assembly 104 is arranged in a one-to-one correspondence with the barrel 102, and includes an active linkage member 1041, a driven linkage member 1042 and a linkage drive, wherein the linkage drive is used to drive the active linkage member 1041 to match the driven linkage member 1042, so that the driven linkage member 1042 can act together with the active linkage member 1041. In one embodiment of the present invention, the active linkage member 1041 is arranged on the mounting shaft 101 or the inner ring bearing 1061, and the driven linkage member 1042 is arranged on the barrel 102 or the outer ring bearing 1062; the linkage assembly 104 can be a clutch or a brake, which generally includes an active part and a driven part, and can be matched and docked to achieve linkage.

[0037] The first material rolls 11 are sleeved on the barrel 102 one by one. When the first material rolls 11 are in place, the fixing assembly 103 is activated, and the driving member drives the fixing member to move toward the corresponding first material roll 11 to contact and fix the corresponding first material roll 11 so that it cannot move axially. Since the barrel 102 is rotatably connected to the installation shaft 101 through the bearing 106, when the material roll shaft driving device drives the installation shaft 101 to rotate, the first material rolls 11 above will not rotate with it. When a first material roll 11 replaces the old material roll as a new material roll and needs to be unwound, its corresponding linkage assembly 104 is activated, and the linkage driving member drives the active linkage member 1041 to dock with the driven linkage member 1042. Therefore, when the material roll shaft driving device drives the installation shaft 101 to rotate, the active linkage member 1041 rotates with it and drives the driven linkage member 1042 and the corresponding first material roll 11 to rotate. Through this design, the individual rotation unloading of each first material roll 11 is achieved, avoiding interference between each other.

[0038] Preferably, the mounting shaft 101 is integrated with the fixing assembly 103 and adopts an inflatable shaft, which includes a shaft body and an inflatable part. Figure 6 As shown, when the external ventilation device 107 (equivalent to the driving member of the fixing assembly 103) ventilates the shaft body, the gas expansion part expands to fix the bearing 106 sleeved on the mounting shaft 101, thereby tightening the bearing 106, the barrel 102 and the first material roll 11, and achieving the position fixation of the first material roll 11. When the linkage assembly 104 adopts a clutch, its active clutch part is arranged on the gas expansion shaft, and its driven clutch part is arranged on the barrel 102. The active clutch part is connected to another air path, and the external ventilation device (equivalent to the linkage drive device) can independently ventilate the air paths of each active clutch part, so that the active clutch part corresponding to the material roll to be unwound is docked with the driven clutch part to achieve transmission.

[0039] When there are multiple groups of material rolls stored on the first material reel 1 and the second material reel 2 respectively, when the old material roll on the unwinding shaft is used up and bonded with the new material roll on the preparation shaft, the old material roll is cut, and the broken end is re-routed together with the new material tape; at this time, the preparation shaft becomes the unwinding shaft, and is driven by the corresponding driving device to rotate and unwind; and the unwinding shaft carrying the old material roll becomes the preparation shaft, and the preparation roll on the shaft that is ready for the next replacement is transferred to the unwinding station and is opposite to the material roll being unwound, so that the material sections are opposite to each other when the roll is changed and the material is bonded together next time.

[0040] In one embodiment, the first material reel 1 or the second material reel 2 and its corresponding first over-roller 3 or second over-roller 4 can retreat at the same time. At this time, the unwinding old material reel is the one closest to the substrate; after the unwinding shaft completes the reel change and material splicing, the displacement drive device 9 (see Figure 2 ) drives the unwinding shaft and its corresponding roller to retreat at the same time, and the next adjacent preparation roll arrives at the unwinding station where the old roll was originally located.

[0041] In another embodiment, the first material reel 1 or the second material reel 2 and its corresponding first over-roll 3 or second over-roll 4 can also move forward simultaneously. In this case, the unwinding old material reel is the one farthest from the substrate; after the unwinding reel completes the reel change and material splicing, the displacement drive device 9 (see Figure 2 ) drives the unwinding shaft and its corresponding roller to move forward simultaneously, and the next adjacent preparation roll arrives at the unwinding station where the old roll was originally located.

[0042] In the above two embodiments, the roller assembly 5, the first cutting assembly 6 and the second cutting assembly 7 are always opposite to the unwinding station and only process the material roll at the unwinding station.

[0043] Specifically, in one embodiment, the displacement drive device 9 includes a driving member and a guiding member, the driving member is preferably a motor and a screw, the guiding member is preferably a guide rail or a guide rod arranged parallel to the axial direction of the first material reel 1 and the second material reel 2, the first material reel 1 or the second material reel 2 is slidingly connected to the guiding member, and the driving member is connected to and drives the first material reel 1 or the second material reel 2 to move along the guiding member.

[0044] The above embodiments are only used to illustrate the present invention but not to limit the technical solutions described in the present invention. The understanding of this specification should be based on the technicians in the relevant technical field. For example, the directional descriptions such as "front", "back", "left", "right", "up", and "down" are described in detail in this specification with reference to the above embodiments. However, ordinary technicians in this field should understand that technicians in the relevant technical field can still modify or replace the present invention with equivalents, and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A roll changing mechanism, characterized in that: The invention comprises a first material reel and a second material reel, wherein the first material reel and / or the second material reel are used to sleeve a plurality of material rolls, and when one of the first material reel and the second material reel is a material unwinding reel, the other is a material preparation reel; when the material unwinding reel is at a unwinding position and the unwinded old material roll is about to be used up, the new material roll at the unwinding position on the material preparation reel is connected to the material belt of the old material roll so that the material preparation reel becomes a new material unwinding reel; The material roll includes a first material roll sleeved on the first material roll shaft and a second material roll sleeved on the second material roll shaft; the roll changing mechanism includes a first passing roller matched with the first material roll and a second passing roller matched with the second material roll; The first material reel or the second material reel and its corresponding first over roller or second over roller can move backward or forward at the same time; The first roller is used to cooperate with the first material roll to guide and support the conveyance of the material tape on the first material roll; the second roller is used to cooperate with the second material roll to guide and support the conveyance of the material tape on the second material roll; The starting ends of the new material roll and the prepared material roll are both adhered with adhesive tape, and the ends of the adhesive tape are correspondingly adhered to the first passing roller and the second passing roller; The roll changing mechanism comprises a supporting roller assembly, the supporting roller assembly comprises a first supporting roller, a second supporting roller and a supporting roller driving device for driving the first supporting roller and / or the second supporting roller to move closer to or away from each other, the supporting roller driving device drives the first supporting roller and the second supporting roller to move closer to each other so as to adhere the adhesive tape to the material tape released from the old material roll on the unwinding shaft; The first passing roller and / or the second passing roller comprises a roller shaft and a plurality of rollers sleeved on the roller shaft, the rollers correspond to the corresponding material rolls one by one, and each roller can rotate independently around the roller shaft.

2. The roll changing mechanism according to claim 1, characterized in that: When the old material roll on the unwinding shaft is about to be used up, the new material roll on the preparation shaft is connected to the material strip released from the old material roll through the tape; the tape is located at the starting end of the new material roll on the preparation shaft, and when the old material roll on the unwinding shaft is about to be used up, the supporting roller driving device drives the first supporting roller and the second supporting roller to approach each other so as to stick the tape to the material strip released from the old material roll on the unwinding shaft.

3. The roll changing mechanism according to claim 1, characterized in that: The roll changing mechanism includes a first cutting component for cutting the first material roll and a second cutting component for cutting the second material roll.

4. The roll changing mechanism according to claim 1, characterized in that: The first material reel and / or the second material reel comprises a plurality of shaft sections, each material reel is sleeved on a corresponding shaft section, and each shaft section is driven to rotate by an independent driving device without interfering with each other.

5. The roll changing mechanism according to claim 1, characterized in that: The first material reel and / or the second material reel comprises a material reel drive device, a mounting shaft, a barrel, a fixing assembly and a linkage assembly, wherein the material reel drive device is connected to and drives the mounting shaft to rotate; a plurality of barrels corresponding to the material reel are arranged at intervals on the mounting shaft, and the material reel is sleeved on the corresponding barrels; the barrel is rotatably arranged on the mounting shaft; the fixing assembly is used to fix the relative position of the material reel and the mounting shaft; the linkage assembly is used to link the corresponding material reel and the mounting shaft to rotate together.

6. The roll changing mechanism according to claim 5, characterized in that: The barrel is rotatably arranged on the installation shaft through a bearing, and the bearing includes an inner ring bearing and an outer ring bearing. The inner ring bearing rotates relative to the installation shaft, and the outer ring bearing does not rotate relative to the inner ring bearing when the linkage assembly is not in effect.

7. The roll changing mechanism according to any one of claims 1 to 6, characterized in that: When the unwinding shaft carrying the old material roll becomes the preparation shaft, the preparation roll prepared for the next replacement on the shaft that becomes the preparation shaft is transferred to the unwinding station and is opposite to the material roll being unwound.

8. The roll changing mechanism according to claim 7, characterized in that: The roll changing mechanism also includes a displacement driving device, which drives the unwinding shaft to move forward or backward at the same time, so that the next spare preparation roll can reach the unwinding station where the old roll was originally located.

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