A coating weight measurement method and a coating weight measurement device

Abstract

The application discloses a coating area density measuring method, which comprises the following steps: placing a base band on a base band conveying unit; punching a film from the base band by using a punch unit; picking up the punched film by a film picking unit and sending the film to a weighing unit; weighing the film by the weighing unit to obtain the weight of each film; and calculating the area density of the base band according to the weight. The application also discloses a coating area density measuring device. The application can effectively connect the area density measurement to a production line, and has high efficiency and low cost.

Description

Technical Field

[0001] This invention relates to the measurement of areal density, and more specifically to a method and apparatus for measuring the areal density of a coating. Background Technology

[0002] The areal density of lithium-ion battery electrodes is closely related to the performance of lithium-ion batteries. During the lithium-ion battery production process, the areal density of the electrodes needs to be tested to determine their condition; therefore, the reliability of the electrode areal density testing equipment is extremely important. Currently, areal density measurement is usually set up separately from the coating equipment, and samples are taken from the finished product for areal density measurement. Consequently, existing coating equipment fails to effectively integrate areal density measurement into the production line, resulting in the inability to monitor the coating areal density and to make reasonable and effective adjustments to the coating equipment to achieve the appropriate range. This leads to substandard products, affecting battery performance and wasting human and material resources. Summary of the Invention

[0003] To address the technical problem that existing coating equipment fails to effectively integrate areal density measurement into the production line, this invention provides a coating areal density measurement method and a coating areal density measurement device.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is to design a method for measuring coating surface density, including: Place the baseband on the baseband delivery unit; A die unit is used to punch a diaphragm from the baseband. The diaphragm pickup unit picks up the downed diaphragm and sends it to the weighing unit; The weighing unit weighs the diaphragms to obtain the weight of each diaphragm. The areal density of the baseband is calculated based on the weight.

[0005] The method for measuring coating surface density also includes: The baseband is spliced ​​using a splicing unit, and adhesive tape is applied to the baseband at the position where the diaphragm is punched down.

[0006] The method for measuring coating surface density also includes: The baseband is cut by using the lateral movement of the cutting unit.

[0007] The method of splicing the baseband using the splicing unit includes: The baseband is clamped and positioned on the base plate by moving the baseband positioning component downwards; Place the tape on the upper feeding roller, pull the tape to the upper tape positioning piece, and use the upper tape positioning piece to position the pulled-out tape; The upper tape roller is moved to the upper tape positioning member and adheres to the tape on the upper tape positioning member. After the tape is dragged to the other side of the upper tape suction cup, the upper tape suction cup adsorbs the tape. Then, the upper tape cutter moves downward to cut the tape. Then, the upper tape suction cup drives the tape to move downward. The tape holder closes to the seat plate hole under the drive of the opening and closing drive mechanism, and the tape is pasted on the base tape positioned on the tape holder. Place the tape on the lower feeding roller, pull the tape to the lower tape positioning piece, and use the lower tape positioning piece to position the pulled-out tape; The lower tape roller is moved to the lower tape positioning member and adheres to the tape on the lower tape positioning member. After the tape is dragged to the other side of the lower tape suction cup, the lower tape suction cup adsorbs the tape. Then, the lower tape cutter moves upward to cut the tape. The tape holder moves away from the seat plate hole under the drive of the opening and closing drive mechanism. The lower tape suction cup drives the tape to move upward and sticks the tape below the base tape positioned on the upper tape suction cup.

[0008] The present invention also provides a coating surface density measuring device, including a frame, the coating surface density measuring device further including: A baseband conveying unit, which is mounted on the frame, is used to convey the baseband; A punching unit is provided on the frame, and the punching unit punches a diaphragm from the base strip; A diaphragm pickup unit is mounted on the frame and located on one side of the die unit. The diaphragm pickup unit picks up the diaphragm punched down by the die unit and sends the diaphragm out. A weighing unit is mounted on the frame. The weighing unit receives the membranes sent out by the membrane pickup unit, weighs the membranes, and obtains the weight of each membrane.

[0009] The coating surface density measuring device also includes: A calculation unit, which is electrically connected to the weighing unit, obtains the weight of each diaphragm obtained by the weighing unit and calculates the areal density based on the weight.

[0010] The coating surface density measuring device also includes: A tape-attaching unit is provided on the frame and located behind the punching die unit. The tape-attaching unit attaches the base tape and pastes adhesive tape on the base tape at the position where the diaphragm is punched.

[0011] The coating surface density measuring device also includes: A cutting unit is mounted on the frame and can move laterally relative to the frame to cut the base tape.

[0012] The tape-connecting unit includes an upper tape-connecting unit, which includes: A base body is mounted on the frame and is movable back and forth relative to the frame; the base body includes a base plate; the baseband passes through the top of the base plate in the back and forth direction; An upper suction cup drive mechanism is provided on the base body; An upper adhesive tape suction cup is disposed on the base and can move up and down relative to the base under the drive of the upper suction cup drive mechanism; An upper feeding roller is mounted on the base and can rotate relative to the base; An upper tape positioning component is provided on the base and located on one side of the upper tape suction cup; An upper idler roller drive mechanism is provided on the base body; The upper belt idler roller is disposed on the base and can move laterally and vertically relative to the base under the drive of the upper idler roller drive mechanism. An upper cutting blade drive mechanism is mounted on the base body; An upper tape cutter is mounted on the base and can move up and down relative to the base under the drive of the upper cutter drive mechanism. The upper tape cutter is located between the upper tape suction cup and the upper tape positioning member. A baseband positioning drive mechanism is mounted on the base body; The baseband positioning component comprises two components, which are symmetrically arranged on the base plate and can move up and down relative to the base plate under the drive of the baseband positioning drive mechanism. The baseband passes between the baseband positioning component and the base plate. The baseband positioning member moves downward to clamp and position the baseband on the base plate. The upper tape roller moves to the upper tape positioning member, adheres to the tape on the upper tape positioning member, and drags the tape to the other side of the upper tape suction cup. The upper tape suction cup then adsorbs the tape. The upper tape cutter moves downward to cut the tape. Then, the upper tape suction cup drives the tape to move downward, sticking the tape to the baseband positioned on the base plate.

[0013] The base plate is provided with a base plate hole that penetrates the base plate; the two baseband positioning members are respectively located on the front and rear sides of the base plate hole; The tape receiving unit further includes a lower tape receiving unit, which includes: An opening and closing drive mechanism is located below the base plate; An adhesive tape holder is disposed at the hole in the seat plate. The adhesive tape holder closes to the hole in the seat plate and moves away from the hole in the seat plate under the drive of the opening and closing drive mechanism. The lower support is located below the base plate; The lower suction cup drive mechanism is mounted on the lower connecting belt seat; The lower tape suction cup is located below the seat plate and can move up and down relative to the seat body under the drive of the lower suction cup drive mechanism. The lower feed roller is mounted on the lower belt seat and can rotate relative to the lower belt seat; A lower tape positioning component is disposed on the lower tape holder and located on one side of the lower tape suction cup; The lower idler roller drive mechanism is located on the lower belt seat; The lower belt idler roller is disposed on the lower belt seat and can move laterally and vertically relative to the lower belt seat under the drive of the lower idler roller drive mechanism. The lower cutter drive mechanism is mounted on the lower connecting belt seat; The lower tape cutter is disposed on the lower tape holder and can move up and down relative to the lower tape holder under the drive of the lower cutter drive mechanism. The lower tape cutter is disposed between the lower tape suction cup and the lower tape positioning member. The baseband positioning component moves downward to clamp and position the baseband on the base plate; Before the upper tape suction cup drives the tape to move downward, the tape seat closes to the seat plate hole under the drive of the opening and closing drive mechanism; The step of attaching the tape to the base strip positioned on the seat plate is: attaching the tape to the base strip positioned on the tape holder; The lower tape roller moves to the lower tape positioning member, adheres to the tape on the lower tape positioning member, and drags the tape to the other side of the lower tape suction cup. The lower tape suction cup then adsorbs the tape, and the lower tape cutter moves upward to cut the tape. The tape holder moves away from the seat plate hole under the drive of the opening and closing drive mechanism. The lower tape suction cup drives the tape to move upward, adhering the tape to the base tape positioned on the upper tape suction cup below.

[0014] This invention places the baseband on a baseband conveying unit, punches a film off the baseband using a punching die unit, picks up the punched film using a film pickup unit, and sends the film to a weighing unit for weighing to obtain the weight of each film. Finally, the areal density of the baseband is calculated based on the weight. This demonstrates that areal density measurement is integrated into the coating production process, allowing for timely monitoring of the coating areal density and enabling reasonable and effective adjustments to the coating equipment. Adjusting the equipment to a suitable range effectively avoids producing substandard products, improves battery performance, and saves labor and material costs. Attached Figure Description

[0015] The present invention will now be described in detail with reference to the embodiments and accompanying drawings, wherein: Figure 1 This is a structural diagram of the coating surface density measuring device of the present invention; Figure 2 This is a structural diagram of the coating surface density measuring device of the present invention from another perspective; Figure 3 This is a structural diagram of the coating surface density measuring device of the present invention from another perspective; Figure 4 This is a structural diagram of the coating surface density measuring device of the present invention from another perspective; Figure 5 This is a structural diagram of the coating surface density measuring device of the present invention from another perspective; Figure 6 This is a top view of the coating surface density measuring device of the present invention; Figure 7 yes Figure 6 Cross-sectional view at point AA; Figure 8 This is a schematic diagram of the coating surface density measurement method of the present invention. Detailed Implementation

[0016] The specific embodiments of the present invention are further described below with reference to the accompanying drawings: Please see also Figures 1 to 8 The coating surface density measurement method of the present invention includes: Step 1: Place the baseband on the baseband delivery unit.

[0017] The baseband conveyor unit 2, as part of the coating equipment, integrates the areal density measurement with the coating process, resulting in a higher degree of automation.

[0018] Step 2: Use the punching die unit 3 to punch the diaphragm off the baseband.

[0019] The punching unit punches a diaphragm off the base strip using a die. The punched diaphragm is then used for subsequent areal density measurement.

[0020] Step 3: The diaphragm pickup unit 4 picks up the downed diaphragm and sends the diaphragm to the weighing unit.

[0021] The diaphragm punched by the die unit falls onto the diaphragm holder 31. The diaphragm holder can position the punched diaphragm by vacuum adsorption. The diaphragm picking unit picks up the punched diaphragm from the diaphragm holder by vacuum adsorption and then sends the diaphragm to the weighing unit.

[0022] The diaphragm pickup unit can move laterally and vertically relative to the frame.

[0023] Step 4: Weighing unit 5 weighs the diaphragms to obtain the weight of each diaphragm.

[0024] Step 5: Calculate the areal density of the baseband based on the weight.

[0025] Since the baseband's tensile strength decreases after the film is punched out, to prevent the baseband from breaking and affecting the coating process, the coating surface density measurement method further includes: splicing the baseband using a splicing unit and applying adhesive tape to the location where the film was punched out on the baseband. Applying adhesive tape to the location where the film was punched out on the baseband effectively enhances its tensile strength resistance.

[0026] In this specific embodiment, the splicing unit splices the baseband to both the upper and lower surfaces. The splicing of the baseband using the splicing unit includes: 1. The baseband is clamped and positioned on the base plate by moving the baseband positioning component downwards.

[0027] Positioning the baseband can prevent the baseband from shifting during splicing.

[0028] 2. Place the tape on the upper feeding roller and pull the tape to the upper tape positioning part. Use the upper tape positioning part to position the pulled-out tape.

[0029] 3. Move the upper tape roller to the upper tape positioning member and adhere it to the tape on the upper tape positioning member. After dragging the tape to the other side of the upper tape suction cup, the upper tape suction cup adsorbs the tape. Then, the upper tape cutter moves downward to cut the tape. Then, the upper tape suction cup drives the tape to move downward. The tape holder closes to the seat plate hole under the drive of the opening and closing drive mechanism, and the tape is pasted onto the base tape positioned on the tape holder.

[0030] 4. Place the tape on the lower feeding roller and pull the tape to the lower tape positioning piece. Use the lower tape positioning piece to position the pulled-out tape.

[0031] 5. Move the lower tape roller to the lower tape positioning member, adhere it to the tape on the lower tape positioning member, and drag the tape to the other side of the lower tape suction cup. The lower tape suction cup then adsorbs the tape, and the lower tape cutter moves upward to cut the tape. The tape holder moves away from the seat plate hole under the drive of the opening and closing drive mechanism. The lower tape suction cup drives the tape to move upward, adhering the tape to the base tape positioned on the upper tape suction cup below.

[0032] To facilitate cutting the baseband according to actual needs, the coating surface density measurement method further includes cutting the baseband using the lateral movement of the cutting unit. The cut baseband can also be spliced ​​using the splicing unit.

[0033] This invention places the baseband on a baseband conveying unit, punches a film off the baseband using a punching die unit, picks up the punched film using a film pickup unit, and sends the film to a weighing unit for weighing to obtain the weight of each film. Finally, the areal density of the baseband is calculated based on the weight. This demonstrates that areal density measurement is integrated into the coating production process, allowing for timely monitoring of the coating areal density and enabling reasonable and effective adjustments to the coating equipment. Adjusting the equipment to a suitable range effectively avoids producing substandard products, improves battery performance, and saves labor and material costs.

[0034] Please see also Figures 1 to 7 The coating surface density measuring device of the present invention includes a frame 1, a baseband conveying unit 2, a punching die unit 3, a film picking unit 4, and a weighing unit 5. Wherein: The frame 1 primarily serves a supporting function. The frame can be part of the coating equipment.

[0035] The baseband conveying unit 2 is mounted on the frame and is used to convey the baseband. In this specific embodiment, the baseband conveying unit may consist of two conveying rollers, and the tension required for the baseband movement comes from the coating equipment.

[0036] The punching unit 3 is mounted on the frame, and punches the diaphragm from the substrate. The punching unit can be implemented using a punching cylinder and punching heads. The punched diaphragm enters the receiving platform, which has an adsorption function to fix the diaphragm. Multiple die heads can be distributed according to the width of the substrate, and different control systems are set up, allowing for single-head or multi-head operation. This design adopts a mechanical and physical design, resulting in high precision of the punched diaphragm and ensuring measurement accuracy.

[0037] The membrane pickup unit 4 is mounted on the frame and located on one side of the die unit. The membrane pickup unit picks up the membrane punched down by the die unit and delivers the membrane out. The membrane pickup unit can pick up the membrane by vacuum adsorption.

[0038] Weighing unit 5 is mounted on the frame. The weighing unit receives the membranes sent out by the membrane pickup unit, weighs the membranes, and obtains the weight of each membrane.

[0039] The weighing unit is equipped with a precision balance that can automatically zero and weigh each mold piece. The high precision of the balance ensures the accuracy of the areal density measurement. Furthermore, the weighing unit can feed back the precision balance values ​​to the control system for areal density calculation.

[0040] To facilitate timely calculation and control, the coating surface density measuring device further includes a calculation unit electrically connected to the weighing unit, which obtains the weight of each film obtained by the weighing unit and calculates the surface density based on the weight.

[0041] In addition, the coating head assembly can provide real-time feedback to the coating production line based on the areal density measurement results, and make adjustments based on the feedback to ensure coating accuracy, which is an effective guarantee for high-precision coating.

[0042] Since the baseband can withstand less tensile force after the film is punched off, in order to avoid the baseband being broken and affecting the coating process, the coating surface density measuring device also includes a tape splicing unit 6. The tape splicing unit is located on the frame and behind the punching die unit. The tape splicing unit splices the baseband and attaches adhesive tape to the position where the film is punched off the baseband.

[0043] To facilitate cutting the baseband as needed, the coating surface density measuring device further includes a cutting unit 7. The cutting unit 7 is mounted on the frame and can move laterally relative to the frame to cut the baseband. The cutting unit 7 can cut the baseband by driving a cutter to move laterally via a cutting drive mechanism.

[0044] In this specific embodiment, the tape-connecting unit 6 includes an upper tape-connecting unit 61. Wherein: The upper tape receiving unit 61 includes a base 611, an upper suction cup drive mechanism 612, an upper tape suction cup 613, an upper feeding roller 614, an upper tape positioning component 615, an upper idler roller drive mechanism 616, an upper tape idler roller 617, an upper cutter drive mechanism 618, an upper tape cutter 619, a base tape positioning drive mechanism 690, and a base tape positioning component 691. Wherein: The seat 611 is mounted on the frame and can move back and forth relative to the frame; the seat includes a seat plate 6111; the baseband passes through the top of the seat plate in the back-and-forth direction.

[0045] The upper suction cup drive mechanism 612 is mounted on the base. The upper suction cup drive mechanism can be driven by a motor or a cylinder.

[0046] The upper tape suction cup 613 is disposed on the base and can move up and down relative to the base under the drive of the upper suction cup drive mechanism. The upper tape suction cup is used to adsorb and fix the tape used for splicing.

[0047] The upper feeding roller 614 is mounted on the base and can rotate relative to the base. The upper feeding roller is used to hold the tape roll.

[0048] The upper tape positioning component 615 is disposed on the base body and located on one side of the upper tape suction cup. The upper tape positioning component uses vacuum adsorption to adsorb the tape. One end of the tape is pulled out from the tape roll and adsorbed below the upper tape positioning component, which facilitates the subsequent bonding of the upper tape roller with the tape and facilitates the dragging of the tape.

[0049] The upper idler roller drive mechanism 616 is mounted on the base. The upper idler roller drive mechanism is used to drive the upper belt idler roller to move up and down and laterally.

[0050] The upper tape idler roller 617 is mounted on the base and can move laterally and vertically relative to the base under the drive of the upper tape drive mechanism. Driven by the upper tape drive mechanism, the upper tape idler roller moves to below the upper tape positioning member, adheres to the tape adsorbed on the upper tape positioning member, and then laterally pulls the tape to below the upper tape suction cup, where the upper tape suction cup holds the pulled tape.

[0051] The upper cutting drive mechanism 618 is mounted on the base.

[0052] The upper tape cutter 619 is mounted on the base and can move up and down relative to the base under the drive of the upper tape drive mechanism. The upper tape cutter is located between the upper tape suction cup and the upper tape positioning member. After the upper tape roller pulls the tape below the upper tape suction cup, the upper tape suction cup absorbs the pulled tape, and the upper tape positioning member also absorbs the tape, at which point the upper tape cutter cuts the tape.

[0053] The baseband positioning drive mechanism 690 is mounted on the base.

[0054] Two baseband positioning members 691 are symmetrically arranged on the base plate and can move up and down relative to the base plate under the drive of the baseband positioning drive mechanism. The baseband passes between the baseband positioning member and the base plate. The baseband positioning member can be used to position the baseband when splicing.

[0055] The baseband positioning member moves downward to clamp and position the baseband on the base plate. The upper tape roller moves to the upper tape positioning member, adheres to the tape on the upper tape positioning member, and drags the tape to the other side of the upper tape suction cup. The upper tape suction cup then adsorbs the tape. The upper tape cutter moves downward to cut the tape. Then, the upper tape suction cup drives the tape to move downward, sticking the tape to the baseband positioned on the base plate.

[0056] In this specific embodiment, the tape receiving unit 6 further includes a lower tape receiving unit 62. The base plate 6111 has a base plate hole 6112 penetrating through it. The two base plate positioning members are respectively located on the front and rear sides of the base plate hole.

[0057] The lower tape receiving unit 62 includes an opening and closing drive mechanism 621, a tape holder 622, a lower tape receiving seat 623, a lower suction cup drive mechanism 624, a lower tape suction cup 625, a lower feeding roller 626, a lower tape positioning component 627, a lower idler roller drive mechanism 628, a lower tape idler roller 629, a lower cutter drive mechanism 680, and a lower tape cutter 681. Wherein: The opening and closing drive mechanism 621 is located below the base plate.

[0058] The adhesive tape holder 622 is located at the seat plate hole. The adhesive tape holder closes to the seat plate hole and moves away from the seat plate hole under the drive of the opening and closing drive mechanism.

[0059] The lower support 623 is located below the base plate. The lower support mainly serves a supporting function.

[0060] The lower suction cup drive mechanism 624 is located on the lower connecting belt seat.

[0061] The lower tape suction cup 625 is located below the seat plate and can move up and down relative to the seat body under the drive of the lower suction cup drive mechanism.

[0062] The feed roller 626 is mounted on the lower belt seat and can rotate relative to the lower belt seat.

[0063] The lower tape positioning component 627 is disposed on the lower tape seat and located on one side of the lower tape suction cup.

[0064] The lower idler roller drive mechanism 628 is located on the lower belt seat.

[0065] The lower belt idler roller 629 is disposed on the lower belt seat and can move laterally and vertically relative to the lower belt seat under the drive of the lower idler roller drive mechanism.

[0066] The lower cutter drive mechanism 680 is located on the lower connecting belt seat.

[0067] The lower tape cutter 681 is disposed on the lower tape holder and can move up and down relative to the lower tape holder under the drive of the lower cutter drive mechanism. The lower tape cutter is disposed between the lower tape suction cup and the lower tape positioning member.

[0068] The baseband positioning member moves downwards to clamp and position the baseband on the base plate. Before the upper tape suction cup drives the tape downwards, the tape holder closes to the hole in the base plate under the drive of the opening and closing drive mechanism.

[0069] The step of attaching the tape to the baseband positioned on the seat plate is: attaching the tape to the baseband positioned on the tape holder.

[0070] The lower tape roller moves to the lower tape positioning member, adheres to the tape on the lower tape positioning member, and drags the tape to the other side of the lower tape suction cup. The lower tape suction cup then adsorbs the tape, and the lower tape cutter moves upward to cut the tape. The tape holder moves away from the seat plate hole under the drive of the opening and closing drive mechanism. The lower tape suction cup drives the tape to move upward, adhering the tape to the base tape positioned on the upper tape suction cup below.

[0071] This invention can perform splicing, cutting, stamping, and areal density measurement on coated substrates as needed. The equipment has a high degree of functional integration and automation, and can meet different functional requirements. It has the following advantages: 1. This invention measures and calculates surface density by punching with a die, achieving high measurement accuracy.

[0072] 2. This invention can be implanted inside the production line and linked with the coating production line to measure the areal density.

[0073] 3. The present invention can provide feedback to the coating device on the production line based on the detection results, and adjust the coating accuracy accordingly.

[0074] 4. This invention can splice the substrate after punching, ensuring that no tape breakage occurs during the coating process.

[0075] 5. This invention includes a tape cutting function, which can cut tapes on the production line as needed, resulting in a high degree of automation.

[0076] 6. The tape splicing and tape cutting functions of this invention can be switched between each other, and the function can be selected as needed, resulting in a high degree of automation.

[0077] 7. The die head of this invention adopts a mechanical and physical design, resulting in high precision of the diaphragm after punching.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for measuring coating surface density, characterized in that... include: Place the baseband on the baseband delivery unit; A die unit is used to punch a diaphragm off the baseband. The diaphragm pickup unit picks up the downed diaphragm and sends it to the weighing unit; The weighing unit weighs the diaphragms to obtain the weight of each diaphragm. Calculate the areal density of the baseband based on the stated weight; The method for measuring coating surface density also includes: The baseband is spliced ​​using a splicing unit, and adhesive tape is applied to the baseband at the position where the diaphragm is punched down. The method of splicing the baseband using the splicing unit includes: The baseband is clamped and positioned on the base plate by moving the baseband positioning component downwards; Place the tape on the upper feeding roller, pull the tape to the upper tape positioning piece, and use the upper tape positioning piece to position the pulled-out tape; The upper tape roller is moved to the upper tape positioning member and adheres to the tape on the upper tape positioning member. After the tape is dragged to the other side of the upper tape suction cup, the upper tape suction cup adsorbs the tape. Then, the upper tape cutter moves downward to cut the tape. Then, the upper tape suction cup drives the tape to move downward. The tape holder closes to the seat plate hole under the drive of the opening and closing drive mechanism, and the tape is pasted on the base tape positioned on the tape holder. Place the tape on the lower feeding roller, pull the tape to the lower tape positioning piece, and use the lower tape positioning piece to position the pulled-out tape; The lower tape roller is moved to the lower tape positioning member and adheres to the tape on the lower tape positioning member. After the tape is dragged to the other side of the lower tape suction cup, the lower tape suction cup adsorbs the tape. Then, the lower tape cutter moves upward to cut the tape. The tape holder moves away from the seat plate hole under the drive of the opening and closing drive mechanism. The lower tape suction cup drives the tape to move upward and sticks the tape below the base tape positioned on the upper tape suction cup.

2. The method for measuring coating surface density according to claim 1, characterized in that: The method for measuring coating surface density also includes: The baseband is cut by using the lateral movement of the cutting unit.

3. A coating surface density measuring device, comprising a frame, characterized in that: The coating surface density measuring device also includes: A baseband conveying unit, which is mounted on the frame, is used to convey the baseband; A punching unit is provided on the frame, and the punching unit punches a diaphragm from the base strip; A diaphragm pickup unit is mounted on the frame and located on one side of the punching unit. The diaphragm pickup unit picks up the diaphragm punched down by the punching unit and delivers the diaphragm out. A weighing unit is mounted on the frame. The weighing unit receives the membranes sent out by the membrane pickup unit, weighs the membranes, and obtains the weight of each membrane. The coating surface density measuring device also includes: A tape-attaching unit is provided on the frame and located behind the punching die unit. The tape-attaching unit attaches the base tape and pastes adhesive tape on the base tape at the position where the diaphragm is punched. The tape-connecting unit includes an upper tape-connecting unit, which includes: A base body is mounted on the frame and is movable back and forth relative to the frame; the base body includes a base plate; the baseband passes through the top of the base plate in the back and forth direction; An upper suction cup drive mechanism is provided on the base body; An upper adhesive tape suction cup is disposed on the base and can move up and down relative to the base under the drive of the upper suction cup drive mechanism; An upper feeding roller is mounted on the base and can rotate relative to the base; An upper tape positioning component is provided on the base and located on one side of the upper tape suction cup; An upper idler roller drive mechanism is provided on the base body; The upper belt idler roller is disposed on the base and can move laterally and vertically relative to the base under the drive of the upper idler roller drive mechanism. An upper cutting blade drive mechanism is mounted on the base body; An upper tape cutter is mounted on the base and can move up and down relative to the base under the drive of the upper cutter drive mechanism. The upper tape cutter is located between the upper tape suction cup and the upper tape positioning member. A baseband positioning drive mechanism is mounted on the base body; The baseband positioning component comprises two components, which are symmetrically arranged on the base plate and can move up and down relative to the base plate under the drive of the baseband positioning drive mechanism. The baseband passes between the baseband positioning component and the base plate. The baseband positioning member moves downward to clamp and position the baseband on the base plate. The upper tape roller moves to the upper tape positioning member, adheres to the tape on the upper tape positioning member, and drags the tape to the other side of the upper tape suction cup. The upper tape suction cup then adsorbs the tape. The upper tape cutter moves downward to cut the tape. Then, the upper tape suction cup drives the tape to move downward, sticking the tape to the baseband positioned on the base plate.

4. The coating surface density measuring device according to claim 3, characterized in that: The coating surface density measuring device also includes: A calculation unit, which is electrically connected to the weighing unit, obtains the weight of each diaphragm obtained by the weighing unit and calculates the areal density based on the weight.

5. The coating surface density measuring device according to claim 3, characterized in that: The coating surface density measuring device also includes: A cutting unit is mounted on the frame and can move laterally relative to the frame to cut the base tape.

6. The coating surface density measuring device according to claim 3, characterized in that: The base plate is provided with a base plate hole that penetrates the base plate; the two baseband positioning members are respectively located on the front and rear sides of the base plate hole; The tape receiving unit further includes a lower tape receiving unit, which includes: An opening and closing drive mechanism is located below the base plate; An adhesive tape holder is disposed at the hole in the seat plate. The adhesive tape holder closes to the hole in the seat plate and moves away from the hole in the seat plate under the drive of the opening and closing drive mechanism. The lower support is located below the base plate; The lower suction cup drive mechanism is mounted on the lower connecting belt seat; The lower tape suction cup is located below the seat plate and can move up and down relative to the seat body under the drive of the lower suction cup drive mechanism. The lower feed roller is mounted on the lower belt seat and can rotate relative to the lower belt seat; A lower tape positioning component is disposed on the lower tape holder and located on one side of the lower tape suction cup; The lower idler roller drive mechanism is located on the lower belt seat; The lower belt idler roller is disposed on the lower belt seat and can move laterally and vertically relative to the lower belt seat under the drive of the lower idler roller drive mechanism. The lower cutter drive mechanism is mounted on the lower connecting belt seat; The lower tape cutter is disposed on the lower tape holder and can move up and down relative to the lower tape holder under the drive of the lower cutter drive mechanism. The lower tape cutter is disposed between the lower tape suction cup and the lower tape positioning member. The baseband positioning component moves downward to clamp and position the baseband on the base plate; Before the upper tape suction cup drives the tape to move downward, the tape seat closes to the seat plate hole under the drive of the opening and closing drive mechanism; The step of attaching the tape to the base strip positioned on the seat plate is to attach the tape to the base strip positioned on the tape holder; The lower tape roller moves to the lower tape positioning member, adheres to the tape on the lower tape positioning member, and drags the tape to the other side of the lower tape suction cup. The lower tape suction cup then adsorbs the tape, and the lower tape cutter moves upward to cut the tape. The tape holder moves away from the seat plate hole under the drive of the opening and closing drive mechanism. The lower tape suction cup drives the tape to move upward, adhering the tape to the base tape positioned on the upper tape suction cup below.

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