Diaphragm roll changing mechanism

Abstract

The utility model discloses a diaphragm roll changing mechanism, which belongs to the technical field of batteries and comprises a receiving device and a first cutting device. The material receiving device is used for connecting an old diaphragm with a new diaphragm; the material receiving device comprises a material receiving driving piece, a first hot melting pressing piece and a second hot melting pressing piece; the material receiving driving part is used for driving the first hot-melting pressing part and / or the second hot-melting pressing part to move, so that the first hot-melting pressing part and the second hot-melting pressing part are close to each other, and the old diaphragm and the new diaphragm are connected through hot melting; the first material cutting device is at least used for cutting off the remaining end of the old diaphragm after the old diaphragm and the new diaphragm are connected. The diaphragm roll changing mechanism provided by the utility model can effectively solve the problems that the production efficiency is low, the quality of a battery cell is influenced by using a tape splicing adhesive and the safety risk is high in the existing manual roll changing mode.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a diaphragm roll-changing mechanism. Background Art

[0002] Lithium batteries have high energy density, long cycle life, no memory effect and environmental protection characteristics. They are widely used in electric vehicles and renewable energy storage. In the structure of lithium batteries, the diaphragm is one of the key internal components. The performance of the diaphragm determines the interface structure and internal resistance of the battery, which directly affects the battery's capacity, cycle and safety performance. Excellent performance diaphragms play an important role in improving the overall performance of the battery. The main function of the diaphragm is to separate the positive and negative electrodes of the battery to prevent the two electrodes from contacting and short-circuiting. In addition, it also has the function of allowing electrolyte ions to pass through.

[0003] In the prior art, in the battery manufacturing process, the membrane roll unwinding generally adopts the method of unwinding a single roll and stopping the machine to change the roll after the roll is used up. That is, after the current membrane roll is used up, the equipment needs to be stopped, the roll is replaced manually, and the next roll of membrane is connected to the current membrane by a tape before restarting the machine. The existing membrane roll changing method has the following problems:

[0004] 1. The existing diaphragm roll changing method is not fully automated and requires manual assistance, which increases the idle time of the equipment and greatly reduces production efficiency;

[0005] 2. When connecting the current diaphragm with the spare roll diaphragm, there is a risk of the tape being stacked into the battery cell due to the need for tape adhesive; and during manual operation, the chance of contact between people and the diaphragm is increased, causing contamination of the diaphragm material;

[0006] 3. As most of the current diaphragm unwinding shafts are installed at a high position, a ladder is required when changing the rolls and connecting them, which makes it impossible to ensure the personal safety of the splicing personnel during the splicing process. Utility Model Content

[0007] In view of the problems existing in the above-mentioned prior art, the utility model provides a diaphragm roll-changing mechanism, which is intended to solve the problems of low production efficiency, use of splicing glue affecting battery quality and high safety risks in the existing manual roll-changing method. To achieve the above-mentioned purpose, the utility model provides the following technical solutions:

[0008] A membrane roll-changing mechanism comprises a material splicing device and a first material cutting device; the material splicing device is used to connect an old membrane with a new membrane; the material splicing device comprises a material splicing driving member, a first hot-melt pressing member and a second hot-melt pressing member; the material splicing driving member is used to drive the first hot-melt pressing member and / or the second hot-melt pressing member to move, so that the first hot-melt pressing member and the second hot-melt pressing member are close to each other, so as to connect the old membrane with the new membrane by hot-melt; the first material cutting device is at least used to cut off the remaining end of the old membrane after the old membrane and the new membrane are connected.

[0009] Furthermore, the material receiving driving member is used to drive the first hot-melt pressing member to move; the first material cutting device moves synchronously with the first hot-melt pressing member.

[0010] Furthermore, the material receiving driving member is used to drive the second hot-melt pressing member to move; the first material cutting device moves synchronously with the second hot-melt pressing member.

[0011] Furthermore, it also includes a second cutting device; the second cutting device and the first cutting device are arranged relative to each other, and after the new diaphragm and the old diaphragm are connected, one of the second cutting device and the first cutting device is used to cut off the remaining end of the old diaphragm, and the other is used to cut off the head end of the new diaphragm.

[0012] Furthermore, the material receiving driving member is used to drive the first hot melt pressing member and the second hot melt pressing member to move; the first material cutting device moves synchronously with the first hot melt pressing member, and the second material cutting device moves synchronously with the second hot melt pressing member.

[0013] Furthermore, the first cutting device includes a first fixed frame and a first and a second powered wire fixedly connected to the first fixed frame, and the first and the second powered wires are respectively arranged on both sides of the first hot-melt pressing piece; the second cutting device includes a second fixed frame and a third and a fourth powered wire fixedly connected to the second fixed frame, and the third and the fourth powered wires are respectively arranged on both sides of the second hot-melt pressing piece; after the new diaphragm and the old diaphragm are connected, the remaining end of the old diaphragm is cut off by one of the first and the third powered wires, and the other one cuts off the head end of the new diaphragm, or the remaining end of the old diaphragm is cut off by one of the second and the fourth powered wires, and the other one cuts off the head end of the new diaphragm.

[0014] Furthermore, it also includes a control component; the control component is electrically connected to the first energized wire, the second energized wire, the third energized wire, the fourth energized wire, the first hot melt pressing component and the second hot melt pressing component.

[0015] Furthermore, it also includes a diaphragm pressing roller device located on one side of the first hot-melt pressing piece, and the diaphragm pressing roller device is used to clamp the free end of the new diaphragm; the diaphragm pressing roller device includes a first pressing roller, a second pressing roller and a pressing roller driving member; the pressing roller driving member is used to drive the first pressing roller and the second pressing roller to move closer to or away from each other to clamp or release the new diaphragm.

[0016] Furthermore, it also includes a diaphragm unwinding device; the diaphragm unwinding device includes a first unwinding group and a second unwinding group which are backup for each other; the first unwinding group includes a first unwinding shaft fixing seat and a first unwinding shaft connected to the first unwinding shaft fixing seat; the second unwinding group includes a second unwinding shaft fixing seat and a second unwinding shaft connected to the second unwinding shaft fixing seat; one of the first unwinding shaft and the second unwinding shaft is used to place the new diaphragm, and the other is used to place the old diaphragm.

[0017] Furthermore, it also includes a correction device; the correction device includes a correction drive, a first correction part and a second correction part; the correction drive is at least used to drive the first correction part and the second correction part to move to a preset position; the first correction part is used to correct the deviation and position the first unwinding group; the second correction part is used to correct the deviation and position the second unwinding group.

[0018] The beneficial effects of the utility model are:

[0019] 1. The utility model provides a membrane roll-changing mechanism, which is suitable for winding equipment for battery production. During the roll-changing process, there is no need to stop the machine for replacement, the degree of automation is improved, the roll-changing time is saved, and the production efficiency is improved.

[0020] 2. The utility model provides a membrane roll-changing mechanism, in which a first unwinding group and a second unwinding group are relatively fixed on a mounting plate, and when an old membrane roll needs to be replaced with a new one after the old membrane roll is used up, it is only necessary to connect the old membrane roll with the new membrane roll by hot-melt connection through a material connection device, and the connection efficiency is high. In addition, since a first cutting device and a second cutting device are provided, which include four sets of energized wires, the four sets of energized wires can meet the needs of cutting off the old membrane and the excess part of the head end of the new membrane under different conditions, and ensure the smooth switching between the old membrane roll and the new membrane roll.

[0021] 3. The utility model provides a membrane roll-changing mechanism, in which the cutting device and the splicing device move synchronously, and the old membrane can be cut after the splicing is completed, which greatly simplifies the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram before the second unwinding group is replaced by the first unwinding group provided by the embodiment of the utility model;

[0023] Figure 2It is a schematic diagram of reel replacement in which the second unwinding group is replaced by the first unwinding group provided by an embodiment of the utility model;

[0024] Figure 3 This is a schematic diagram before reel change when the first unwinding group is replaced by the second unwinding group provided by an embodiment of the utility model;

[0025] Figure 4 It is a schematic diagram of reel replacement from the first unwinding group to the second unwinding group provided by an embodiment of the utility model;

[0026] In the accompanying drawings: 1-first hot-melt pressing piece, 2-second hot-melt pressing piece, 3-first fixed frame, 4-first energized wire, 5-second energized wire, 6-second fixed frame, 7-third energized wire, 8-fourth energized wire, 9-first pressure roller, 10-second pressure roller, 11-pressure roller driving member, 12-first unwinding shaft fixing seat, 13-first unwinding shaft, 14-second unwinding shaft fixing seat, 15-second unwinding shaft, 16-first deviation correcting member, 17-second deviation correcting member, 18-first material receiving driving member, 19-second material receiving driving member, 20-diaphragm roller, 21-mounting plate. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods, but the present invention is not limited to the following embodiments.

[0028] Embodiment 1:

[0029] See attached Figures 1 to 4 . The present embodiment provides a diaphragm roll-changing mechanism, which can effectively solve the problems of low production efficiency, use of joint adhesive affecting the quality of battery cells, and high safety risks in the existing manual roll-changing method. Define the diaphragm in the diaphragm roll currently in use as the old diaphragm, and the diaphragm in the spare diaphragm roll as the new diaphragm. The diaphragm roll-changing mechanism includes a material splicing device and a first material cutting device, and the material splicing device is used to connect the old diaphragm and the new diaphragm. The material splicing device includes a material splicing drive, a first hot-melt pressing component 1 and a second hot-melt pressing component 2, and the new diaphragm and the old diaphragm pass between the first hot-melt pressing component 1 and the second hot-melt pressing component 2. The material splicing drive is used to drive the first hot-melt pressing component 1 and / or the second hot-melt pressing component 2 to move, so that when the first hot-melt pressing component 1 and the second hot-melt pressing component 2 are close to each other, the new diaphragm and the old diaphragm are hot-melt connected together. The material splicing drive can also be used to drive the first hot-melt pressing component 1 and / or the second hot-melt pressing component 2 to move, so that the first hot-melt pressing component 1 and the second hot-melt pressing component 2 are separated. For example, the first hot melt pressing piece 1 and / or the second hot melt pressing piece 2 are heat sealing heads to heat-melt the new diaphragm and the old diaphragm; the material connection driving piece can be a servo motor or a telescopic cylinder. The first cutting device is at least used to cut off the remaining end of the old diaphragm after the old diaphragm and the new diaphragm are connected.

[0030] The material receiving device and the first material cutting device may include the following movement modes:

[0031] Method 1: The material receiving driving member is used to drive the first hot melt pressing member 1 to move, and the first hot melt pressing member 1 approaches the second hot melt pressing member 2, so that the new diaphragm and the old diaphragm are abutted against the second hot melt pressing member 2, and the old diaphragm and the new diaphragm are connected by the cooperation of the first hot melt pressing member 1 and the second hot melt pressing member 2. After the old diaphragm and the new diaphragm are connected, the first cutting device is used to cut off the remaining end of the old diaphragm. Preferably, the first cutting device moves synchronously with the first hot melt pressing member 1 to cut off the remaining end of the old diaphragm.

[0032] Method 2: The material receiving driving member is used to drive the second hot melt pressing member 2 to move, and the second hot melt pressing member 2 approaches the first hot melt pressing member 1, so that the new diaphragm and the old diaphragm are abutted against the first hot melt pressing member 1, and the old diaphragm and the new diaphragm are connected through the first hot melt pressing member 1 and the second hot melt pressing member 2. After the old diaphragm and the new diaphragm are connected, the first cutting device is used to cut off the remaining end of the old diaphragm. Preferably, the first cutting device moves synchronously with the second hot melt pressing member 2 to cut off the remaining end of the old diaphragm.

[0033] Method 3: The material connection driving member is used to drive the first hot melt pressing member 1 and the second hot melt pressing member 2 to move simultaneously, so that the first hot melt pressing member 1 and the second hot melt pressing member 2 are close to each other, and finally the new diaphragm and the old diaphragm are clamped and connected. After the old diaphragm and the new diaphragm are connected, the first cutting device is used to cut off the remaining end of the old diaphragm.

[0034] When in use, the free end of the new diaphragm is pulled out, the old diaphragm and the new diaphragm are connected together by the material connection device, and then the remaining end of the old diaphragm is cut off by the first material cutting device, so as to quickly replace the old diaphragm roll with the new diaphragm roll. There is no need to stop the machine for replacement during the roll replacement process, the degree of automation is improved, the roll replacement time is saved, and the production efficiency is improved.

[0035] Embodiment 2:

[0036] See attached Figures 1 to 4 . On the basis of Example 1, the first hot melt pressing piece 1 can be a first heat sealing head, and the second hot melt pressing piece 2 can be a second heat sealing head, and the first heat sealing head and the second heat sealing head are close to each other to connect the old diaphragm and the new diaphragm by hot melt. According to the prior art, in the battery production process, the diaphragm is generally made of polyethylene or polypropylene, and the old diaphragm and the new diaphragm can be quickly connected together by hot melt connection. Compared with the traditional connection method using joint tape, the hot melt connection method improves the connection efficiency, eliminates the joint tape, and thus avoids the risk of the joint tape being stacked into the battery cell due to the use of the joint tape.

[0037] After the old diaphragm and the new diaphragm are connected, the remaining end of the old diaphragm needs to be cut off by the first cutting device to ensure smooth switching between the old diaphragm roll and the new diaphragm roll. At the same time, in order to facilitate the connection between the old diaphragm and the new diaphragm, the new diaphragm needs to be pulled out for a section. After the connection is completed, in order to ensure the quality of the connection, the excess part of the head end of the new diaphragm also needs to be cut off. In this embodiment, the diaphragm roll changing device also includes a second cutting device, the second cutting device and the first cutting device are arranged relative to each other, and after the new diaphragm and the old diaphragm are connected, one of the second cutting device and the first cutting device is used to cut off the remaining end of the old diaphragm, and the other is used to cut off the head end of the new diaphragm.

[0038] In the present embodiment, the material receiving drive is used to drive the first hot melt press 1 and the second hot melt press 2 to move. Preferably, the first cutting device moves synchronously with the first hot melt press 1, and the second cutting device moves synchronously with the second hot melt press 2. The material receiving drive drives the first hot melt press 1 and the second hot melt press 2 to move. The material receiving drive may include a first material receiving drive 18 and a second material receiving drive 19. The first material receiving drive 18 and the second material receiving drive 19 correspond to the first hot melt press 1 and the second hot melt press 2 one by one. When the first hot melt press 1 and the second hot melt press 2 cooperate to connect the old diaphragm and the new diaphragm, the first cutting device and the second cutting device cooperate with each other, the first cutting device cuts off the remaining end of the old diaphragm, the second cutting device cuts off the head end of the new diaphragm, or the first cutting device cuts off the head end of the new diaphragm, and the second cutting device cuts off the remaining end of the old diaphragm.

[0039] Specifically, the first cutting device includes a first fixed frame 3, on which a first energized wire 4 and a second energized wire 5 are fixedly connected, and the first energized wire 4 and the second energized wire 5 are respectively arranged on both sides of the first hot melt pressing piece 1. The second cutting device includes a second fixed frame 6, on which a third energized wire 7 and a fourth energized wire 8 are fixedly connected, and the third energized wire 7 and the fourth energized wire 8 are respectively arranged on both sides of the second hot melt pressing piece 2. Among them, the first energized wire 4 can correspond to the fourth energized wire 8 and be located on the same side; the second energized wire 5 can correspond to the third energized wire 7 and be located on the other side. After the first energized wire 4, the second energized wire 5, the third energized wire 7 and the fourth energized wire 8 are energized and heated, the diaphragm in contact with them can be quickly cut off. The first energized wire 4, the second energized wire 5, the third energized wire 7 and the fourth energized wire 8 can be hot cutting wires. When changing the roll, after the new diaphragm is connected to the old diaphragm, the first power-carrying wire 4 and the third power-carrying wire 7 cooperate with each other to cut off the remaining end of the old diaphragm and the leading end of the new diaphragm, or the second power-carrying wire 5 and the fourth power-carrying wire 8 cooperate with each other to cut off the remaining end of the old diaphragm and the leading end of the new diaphragm.

[0040] The membrane reel changing mechanism also includes a control member, which is electrically connected to the first energized wire 4, the second energized wire 5, the third energized wire 7, the fourth energized wire 8, the first hot melt pressing member 1 and the second hot melt pressing member 2, and the control member is used to control the first energized wire 4, the second energized wire 5, the third energized wire 7, the fourth energized wire 8, the first hot melt pressing member 1 and the second hot melt pressing member 2 to be energized or de-energized. The control member can be a controller. Four sets of energized wires can meet the needs of cutting the old membrane and cutting the excess part of the head end of the new membrane under different circumstances, ensuring the smooth switching between the old membrane roll and the new membrane roll. The utility model is provided with a first cutting device that moves synchronously with the first hot melt pressing member 1 and a second cutting device that moves synchronously with the second hot melt pressing member 2, so that whether the first membrane unwinding group is replaced by the second unwinding group or the second unwinding group is replaced by the first unwinding group, the membranes on both sides of the first hot melt pressing member 1 and the second hot melt pressing member 2 are as close as possible to the hot cut wire, ensuring that the membrane can be cut normally.

[0041] Embodiment three:

[0042] See attached Figures 1 to 4 . On the basis of the second embodiment, the diaphragm roll changing mechanism also includes a diaphragm pressing roller device located on one side of the first hot melt pressing member 1, and the diaphragm pressing roller device is used to clamp the free end of the new diaphragm. Among them, the diaphragm pressing roller device includes a first pressing roller 9, a second pressing roller 10 and a pressing roller driving member 11, and the pressing roller driving member 11 is used to drive the first pressing roller 9 and the second pressing roller 10 to approach each other to clamp the new diaphragm. The pressing roller driving member 11 can be a clamping cylinder. When changing the roll, the free end of the new diaphragm is pulled out to the diaphragm pressing roller device manually or mechanically, and the diaphragm pressing roller device clamps and fixes the free end of the new diaphragm, so that the first hot melt pressing member 1 or the second hot melt pressing member 2 can stably contact the new diaphragm to ensure the hot melt connection effect.

[0043] Embodiment 4:

[0044] See attached Figures 1 to 4 . On the basis of the third embodiment, the diaphragm reel changing mechanism also includes a diaphragm unwinding device, and the diaphragm unwinding device includes a first unwinding group and a second unwinding group, and the first unwinding group and the second unwinding group are standby for each other. The first unwinding group includes a first unwinding shaft fixing seat 12 and a first unwinding shaft 13 connected to the first unwinding shaft fixing seat 12. The second unwinding group includes a second unwinding shaft fixing seat 14 and a second unwinding shaft 15 connected to the second unwinding shaft fixing seat 14. One of the first unwinding shaft 13 and the second unwinding shaft 15 is used to place a new diaphragm, and the other is used to place an old diaphragm. By providing two diaphragm unwinding groups that are standby for each other, the diaphragm reel can be quickly changed. Preferably, the first unwinding shaft fixing seat 12 and the second unwinding shaft fixing seat 14 can be connected respectively by a driving member and a mounting plate 21, so as to facilitate the adjustment of the placement position of the diaphragm roll so that the old diaphragm and the new diaphragm are aligned when the tape is connected.

[0045] In the present embodiment, the diaphragm roll changing mechanism further includes a deviation correction device, which includes a deviation correction drive, a first deviation correction member 16 and a second deviation correction member 17. The deviation correction drive is at least used to drive the first deviation correction member 16 or the second deviation correction member 17 to move to a preset position, and the deviation correction drive can also be used to drive the first deviation correction member 16 or the second deviation correction member 17 to retract to an initial position. The first deviation correction member 16 is used to correct the deviation and position of the first unwinding group, and the second deviation correction member 17 is used to correct the deviation and position of the second unwinding group. The deviation correction drive can be a servo motor, and the first deviation correction member 16 and the second deviation correction member 17 can be correction sensors. Among them, the preset position can be that the correction sensor can sense at least one side of the new diaphragm roll, and the position of the new diaphragm roll can be adjusted by detecting the side position. Taking the first correcting member 16 as an example, when changing the roll, the free end of the new diaphragm is pulled out to the diaphragm pressure roller device manually or mechanically for initial positioning and clamping of the new diaphragm. At this time, the correcting drive member drives the first correcting member 16 to extend to the specified position. Under the signal feedback of the first correcting member 16, the first unwinding shaft fixing seat 12 can be axially moved to the specified position under the action of the drive member, thereby completing the precise positioning of the new diaphragm, and finally achieving accurate positioning of the old diaphragm and the new diaphragm, which is convenient for accurate use after connection.

[0046] The diaphragm roll-changing mechanism may further include a diaphragm passing roller 20 , which may be used for winding and pulling the diaphragm.

[0047] like Figure 1 and Figure 2 As shown, the second unwinding group is replaced with the first unwinding group. The diaphragm in the second unwinding group is the old diaphragm, and the diaphragm in the first unwinding group is the new diaphragm. The diaphragm replacement process is as follows:

[0048] All mechanisms can be fixed on the mounting plate 21. Before changing the roll, the membrane in the first unwinding group, i.e., the head end of the new membrane, is pulled to the membrane pressing roller device for initial positioning and clamping the new membrane by manual or mechanical film pulling. At this time, the first deviation-correcting member 16 is extended to the specified position under the drive of the deviation-correcting drive member. Under the signal feedback of the first deviation-correcting member 16, the first unwinding shaft fixing seat 12 is moved axially to the specified position back and forth under the action of the servo motor, thereby completing the precise positioning of the new membrane in the first unwinding group. After completing the positioning, the first deviation-correcting member 16 is retracted. At this time, the material receiving drive member drives the first hot-melt pressing member 1 and the first cutting device to move synchronously to Figure 2 position; when the first hot-melt pressing piece 1 and the first cutting device are in place, the first hot-melt pressing piece 1 and the second hot-melt pressing piece 2 are energized at the same time, the welding head heats up, and under the action of high temperature, the new diaphragm and the old diaphragm are welded together; after the diaphragm connection is completed, the first energized wire 4 and the third energized wire 7 are energized again to complete the cutting of the old diaphragm and the excess part of the head end of the new diaphragm, and finally the first hot-melt pressing piece 1 is retracted, and the first pressure roller 9 and the second pressure roller 10 are retracted to complete the whole set of the second unwinding group to replace the first unwinding group with the reel changing process.

[0049] The first unwinding group is replaced by the second unwinding group. Figure 3 and Figure 4 As shown, the roll changing principle is roughly the same as above and will not be repeated here. The difference is that the second hot melt pressing part 2 and the second cutting device need to be extended, and the second power conducting wire 5 and the fourth power conducting wire 8 are energized during cutting.

[0050] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A diaphragm roll changing mechanism, characterized in that: The invention comprises a material receiving device and a first material cutting device; the material receiving device is used to connect the old diaphragm and the new diaphragm; the material receiving device comprises a material receiving driving member, a first hot-melt pressing member (1) and a second hot-melt pressing member (2); the material receiving driving member is used to drive the first hot-melt pressing member (1) and / or the second hot-melt pressing member (2) to move, so that the first hot-melt pressing member (1) and the second hot-melt pressing member (2) are close to each other, so as to connect the old diaphragm and the new diaphragm by hot-melt; the first material cutting device is used at least to cut off the remaining end of the old diaphragm after the old diaphragm and the new diaphragm are connected.

2. A diaphragm roll changing mechanism according to claim 1, characterized in that: The material receiving driving member is used to drive the first hot-melt pressing member (1) to move; the first material cutting device moves synchronously with the first hot-melt pressing member (1).

3. The diaphragm roll changing mechanism according to claim 1, characterized in that: The material receiving driving member is used to drive the second hot-melt pressing member (2) to move; the first material cutting device moves synchronously with the second hot-melt pressing member (2).

4. The diaphragm roll changing mechanism according to claim 1, characterized in that: It also includes a second cutting device; the second cutting device and the first cutting device are arranged opposite to each other, and after the new diaphragm and the old diaphragm are connected, one of the second cutting device and the first cutting device is used to cut off the remaining end of the old diaphragm, and the other is used to cut off the head end of the new diaphragm.

5. A diaphragm roll changing mechanism according to claim 4, characterized in that: The material receiving drive member is used to drive the first hot melt pressing member (1) and the second hot melt pressing member (2) to move; the first material cutting device moves synchronously with the first hot melt pressing member (1), and the second material cutting device moves synchronously with the second hot melt pressing member (2).

6. A diaphragm roll changing mechanism according to claim 5, characterized in that: The first cutting device comprises a first fixing frame (3) and a first conducting wire (4) and a second conducting wire (5) fixedly connected to the first fixing frame (3), wherein the first conducting wire (4) and the second conducting wire (5) are respectively arranged on both sides of the first hot-melt pressing piece (1); the second cutting device comprises a second fixing frame (6) and a third conducting wire (7) and a fourth conducting wire (8) fixedly connected to the second fixing frame (6), wherein the third conducting wire (7) and the fourth conducting wire (8) are respectively arranged on both sides of the second hot-melt pressing piece (2); after the new diaphragm and the old diaphragm are connected, the remaining end of the old diaphragm is cut off by one of the first conducting wire (4) and the third conducting wire (7), and the head end of the new diaphragm is cut off by the other, or the remaining end of the old diaphragm is cut off by one of the second conducting wire (5) and the fourth conducting wire (8), and the head end of the new diaphragm is cut off by the other.

7. A diaphragm roll changing mechanism according to claim 6, characterized in that: It also includes a control component; the control component is electrically connected to the first current-carrying wire (4), the second current-carrying wire (5), the third current-carrying wire (7), the fourth current-carrying wire (8), the first hot-melt pressing component (1) and the second hot-melt pressing component (2).

8. The diaphragm roll changing mechanism according to claim 1, characterized in that: It also includes a diaphragm pressing roller device located on one side of the first hot-melt pressing member (1), and the diaphragm pressing roller device is used to clamp the free end of the new diaphragm; the diaphragm pressing roller device includes a first pressing roller (9), a second pressing roller (10) and a pressing roller driving member (11); the pressing roller driving member (11) is used to drive the first pressing roller (9) and the second pressing roller (10) to move closer to each other so as to clamp the new diaphragm.

9. The diaphragm roll changing mechanism according to claim 1, characterized in that: It also includes a diaphragm unwinding device; the diaphragm unwinding device includes a first unwinding group and a second unwinding group which are backup for each other; the first unwinding group includes a first unwinding shaft fixing seat (12) and a first unwinding shaft (13) connected to the first unwinding shaft fixing seat (12); the second unwinding group includes a second unwinding shaft fixing seat (14) and a second unwinding shaft (15) connected to the second unwinding shaft fixing seat (14); one of the first unwinding shaft (13) and the second unwinding shaft (15) is used to place the new diaphragm, and the other is used to place the old diaphragm.

10. A diaphragm roll changing mechanism according to claim 9, characterized in that: The invention also comprises a deviation correction device; the deviation correction device comprises a deviation correction driving member, a first deviation correction member (16) and a second deviation correction member (17); the deviation correction driving member is at least used to drive the first deviation correction member (16) and the second deviation correction member (17) to move to a preset position; the first deviation correction member (16) is used to correct the deviation and position the first unwinding group; the second deviation correction member (17) is used to correct the deviation and position the second unwinding group.

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