CN220853464U

CN220853464U - Diaphragm surface characteristic detection device for lithium battery

Info

Publication number: CN220853464U
Application number: CN202322500436.4U
Authority: CN
Inventors: 王彪; 董明亮; 吴智永
Original assignee: Ningde Jiatuo Intelligent Equipment Co ltd
Current assignee: Ningde Jiatuo Intelligent Equipment Co ltd
Priority date: 2023-09-14
Filing date: 2023-09-14
Publication date: 2024-04-26
Anticipated expiration: 2033-09-14

Abstract

The utility model discloses a diaphragm surface characteristic detection device for a lithium battery, which comprises an unreeling mechanism, a first guide roller, a second guide roller, a laser detection mechanism and two balancing weights, wherein the unreeling mechanism, the first guide roller and the second guide roller are sequentially arranged from front to back along a travelling path of a diaphragm, the top point of the first guide roller surface and the top point of the second guide roller surface are positioned on the same horizontal line, the laser detection mechanism is positioned above a connecting line between the top point of the first guide roller surface and the top point of the second guide roller surface, and the two balancing weights are respectively used for magnetically attracting and connecting the middle positions of two sides of the head end of the diaphragm. The utility model can realize tension uniformity detection on the diaphragm material, and has the advantages of simple structure, small volume, small occupied space and low cost.

Description

Diaphragm surface characteristic detection device for lithium battery

Technical Field

The utility model relates to a detection device, in particular to a diaphragm surface characteristic detection device for a lithium battery.

Background

In the construction of lithium batteries, the separator is one of the critical inner layer components. The performance of the diaphragm determines the interface structure, internal resistance and the like of the battery, directly influences the capacity, circulation, safety performance and other characteristics of the battery, and the diaphragm with excellent performance plays an important role in improving the comprehensive performance of the battery. In the diaphragm production process, if the problem such as wavy edge can appear easily in the uneven tension, if the tension is too big can appear the problem such as collapsing easily, this kind of problem of diaphragm can not discern before producing the lithium cell and will influence the quality of lithium cell, consequently, carry out tension homogeneity detection to the diaphragm material supplied before producing the lithium cell and be crucial to help the production personnel know whether the diaphragm material supplied satisfies the production requirement.

The prior device for detecting the tension uniformity of the diaphragm incoming material generally comprises an unreeling mechanism, a detecting mechanism and a reeling mechanism, wherein an unreeling swinging roller mechanism and a reeling swinging roller mechanism are respectively arranged between the unreeling mechanism and the detecting mechanism and between the detecting mechanism and the reeling mechanism so that tension is generated by the unreeling section diaphragm and the reeling section diaphragm, and a tension isolating mechanism is arranged between the detecting mechanism and the reeling swinging roller to isolate the tension of the unreeling section diaphragm and the tension of the reeling section diaphragm.

Disclosure of utility model

In order to overcome the defects of the prior art, the utility model provides the diaphragm surface characteristic detection device for the lithium battery, which has the advantages of simple structure, small volume, small occupied space and low cost.

The technical scheme adopted for solving the technical problems is as follows:

The utility model provides a diaphragm surface feature detection device for lithium cell, passes roller, laser detection mechanism and two balancing weights including unreeling mechanism, first direction, the roller is crossed in the second direction, unreeling mechanism, first direction are crossed roller and second direction and are crossed the roller and set gradually in the past to the back along the walking route of diaphragm, the vertex that roller roll surface was crossed in the first direction and the vertex that roller roll surface was crossed in the second direction are located same horizontal line, laser detection mechanism is located the top of the line between roller roll surface vertex is crossed in the first direction and the roller roll surface vertex is crossed in the second direction, two balancing weights are used for the magnetism respectively inhale the intermediate position department of connecting the two sides at the diaphragm head end.

As the preferred technical scheme, laser detection mechanism includes two detection fixing bases, detects the mounting panel, detects sharp module and laser displacement sensor, two detection fixing bases are controlling relative setting, the both ends that detect the mounting panel set up respectively on two detection fixing bases, it is in to detect sharp module one side of mounting panel, laser displacement sensor sets up detect straight line module keep away from one side of detecting the mounting panel, laser displacement sensor is located first direction is crossed roller roll surface summit and second direction is crossed the top of the line between the roller roll surface summit and is corresponded with the center of this line, it is used for the drive to detect sharp module laser displacement sensor is along the width direction left and right sides of diaphragm.

As the preferable technical scheme, unreeling mechanism includes the physiosis axle, the both ends of physiosis axle are formed with two spindle heads respectively, the end-to-end connection of spindle head has the spindle head guard shield, the periphery of spindle head rotationally overlaps and is equipped with the axle sleeve, the axle sleeve is located between physiosis axle and the spindle head guard shield, axle head guard shield and axle sleeve holding are in the U type inslot of unreeling fixing base one end, unreel the top of fixing base be equipped with the through-hole setting of unreeling fixing base that the axle sleeve corresponds, unreel the output shaft of cylinder runs through the through-hole setting of unreeling fixing base, and unreel the end of the output shaft of cylinder is equipped with the fixed block, the fixed block has the cambered surface, the cambered surface is used for with the outer peripheral face of corresponding axle sleeve offset, unreel the cylinder is used for driving the fixed block reciprocates to make the cambered surface of fixed block offset or make the cambered surface of fixed block and the outer peripheral face phase separation of corresponding axle sleeve.

As the preferred technical scheme, still include differential screw mechanism, differential screw mechanism includes two is the mount pad that control relative setting, two is control relative setting's screw rod subassembly and drive assembly, two screw rod subassemblies set up respectively the top of two mount pads, first direction is crossed the roller and is crossed the roller with the second direction is located between two screw rod subassemblies, the both ends that the roller was crossed in the first direction, the both ends that the roller was crossed in the second direction respectively with two screw rod subassemblies are connected, drive assembly is used for through two screw rod subassemblies drive first direction is crossed the roller and is crossed the roller with the second direction is crossed the roller and is moved in opposite directions or dorsad.

As the preferable technical scheme, the lead screw assembly comprises a first lead screw, a second lead screw, a first sliding block seat and a second sliding block seat, wherein the first lead screw and the second lead screw are sequentially arranged from front to back, two ends of the first lead screw and two ends of the second lead screw are respectively and rotatably arranged at the top ends of corresponding mounting seats, the thread directions of the first lead screw and the second lead screw are opposite, one ends, close to each other, of the first lead screw and the second lead screw are connected through a coupling, the first sliding block seat is in threaded fit with the first lead screw, the second sliding block seat is in threaded fit with the second lead screw, the first guide roller is positioned between the first lead screws of the two lead screw assemblies, two ends of the first guide roller are respectively connected with the first sliding block seats of the two lead screw assemblies, the second guide roller is positioned between the second lead screws of the two lead screw assemblies, and two ends of the second guide roller are respectively connected with the second sliding block seats of the two lead screw assemblies.

As the preferable technical scheme, drive assembly includes connecting rod and hand wheel, the connecting rod rotationally sets up the one end at two mount pads, and the connecting rod is close to with the first lead screw of two lead screw subassemblies mutually, the one end periphery cover that keeps away from the second lead screw of first lead screw is equipped with first bevel gear, the periphery cover of connecting rod be equipped with first bevel gear engaged with second bevel gear, the one end of connecting rod is connected with the hand wheel.

As the preferable technical scheme, the two balancing weights are respectively provided with a magnetic attraction piece, and the magnetic attraction pieces of the two balancing weights are respectively used for magnetically attracting the middle positions of the two sides connected to the head end of the diaphragm.

As the preferable technical scheme, the novel unreeling machine further comprises three supporting and unreeling rollers, wherein the three supporting and unreeling rollers are respectively a first supporting and unreeling roller, a second supporting and unreeling roller and a third supporting and unreeling roller, and the first supporting and unreeling roller, the second supporting and the third supporting and unreeling roller are sequentially arranged between the unreeling mechanism and the first guiding and unreeling roller along the travelling path of the diaphragm.

As a preferable technical scheme, the device further comprises a tape connecting platform arranged between the first supporting roller and the second supporting roller along the travelling path of the diaphragm.

As the preferable technical scheme, connect area platform includes the platform body, two depression bars that are relative setting around being and connect area cylinder, two depression bars are located respectively the top of platform body, two connect area cylinder set up respectively the bottom of platform body and respectively with two depression bars correspond, the platform body is equipped with two through-holes, two through-holes respectively with two connect area cylinder correspond, the end of the output shaft of two connect area cylinders passes the through-hole that corresponds respectively and is connected with the depression bar that corresponds, two connect area cylinder respectively and be used for driving the depression bar that corresponds and reciprocate.

The beneficial effects of the utility model are as follows: according to the utility model, the diaphragm can be unreeled through the unreeling mechanism, the first guide roller, the second guide roller, the laser detection mechanism and the two balancing weights, the diaphragm can be supported and guided respectively through the first guide roller and the second guide roller, the laser detection mechanism can scan the surface of the diaphragm along the width direction of the diaphragm, so that the transverse height difference of the surface of the diaphragm can be achieved, the tension uniformity detection result of the diaphragm can be obtained through the height difference, whether the diaphragm meets the production requirement can be judged according to the tension uniformity result, the diaphragm can generate tension through the two balancing weights, the laser detection mechanism can scan the surface of the diaphragm along the width direction of the diaphragm conveniently, and the detection accuracy and precision are ensured. The utility model can realize tension uniformity detection on the diaphragm material, has simple structure, small volume, small occupied space, easy operation and low cost.

Drawings

The utility model will be further described with reference to the drawings and examples.

Fig. 1 is a schematic structural diagram of a device for detecting surface characteristics of a separator for a lithium battery according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of the unreeling mechanism of the separator surface characteristic detecting device for lithium batteries shown in FIG. 1;

FIG. 3 is a schematic view of the structure of a tape deck of the separator surface feature detection device for a lithium battery shown in FIG. 1;

FIG. 4 is a schematic view of the first guide roller, the second guide roller and the differential screw mechanism of the separator surface feature detection device for lithium batteries shown in FIG. 1;

fig. 5 is a schematic structural view of a laser detection mechanism of the separator surface characteristic detection device for lithium batteries shown in fig. 1.

Detailed Description

The conception, specific structure, and technical effects produced by the present utility model will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, features, and effects of the present utility model. It is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present utility model based on the embodiments of the present utility model. In addition, all the coupling/connection relationships referred to in the patent are not direct connection of the single-finger members, but rather, it means that a better coupling structure can be formed by adding or subtracting coupling aids depending on the specific implementation. The technical features in the utility model can be interactively combined on the premise of no contradiction and conflict.

Referring to fig. 1, an apparatus for detecting surface characteristics of a lithium battery separator according to an embodiment of the present utility model includes a frame 10, an unreeling mechanism 20, a supporting roller, a tape receiving platform 40, a first guiding roller 50, a second guiding roller 60, a differential screw mechanism 70, a laser detecting mechanism 80, and two balancing weights 90. In this embodiment, there are three supporting rollers, which are a first supporting roller 30a, a second supporting roller 30b, and a third supporting roller 30c, respectively. The unreeling mechanism 20, the first supporting roller 30a, the tape receiving platform 40, the second supporting roller 30b, the third supporting roller 30c, the first guiding roller 50 and the second guiding roller 60 are sequentially arranged on the frame 10 from front to back along the travelling path of the diaphragm 200. The differential screw mechanism 70 and the laser detection mechanism 80 are provided on the frame 10, respectively. The two balancing weights 90 are respectively used for magnetically attracting and connecting the two sides of the head end of the diaphragm 200 at the middle positions. It will be appreciated that the number of supported rollers may be set according to the actual circumstances. The structure of the present utility model will be specifically described below.

The frame 10 includes a bottom plate 11 and two risers 12, the two risers 12 are oppositely arranged left and right, and the two risers 12 are respectively arranged at the top end of the bottom plate 11. The inner sides of the two risers 12 are connected by a cross member 13. The number of the cross beams 13 may be set according to the actual situation. The inside of the riser 12 refers to the side of the riser 12 near the center of the frame 10.

The unreeling mechanism 20 is used for unreeling the membrane 200. As shown in fig. 2, the unreeling mechanism 20 includes an air-expanding shaft 21, and two shaft heads 211 are formed at both ends of the air-expanding shaft 21, respectively. The end of the stub shaft 211 (i.e., the end of the stub shaft 211 remote from the inflatable shaft 21) is attached to a stub shaft shield 23. The outer circumference of the head 211 is rotatably sleeved with a sleeve 22, and the sleeve 22 is positioned between the inflatable shaft 21 and the head cover 23. Specifically, the outer periphery of the shaft head 211 is sequentially sleeved with a first rotary bearing 221a and a second rotary bearing 221b along the direction away from the air expansion shaft 21, and the first rotary bearing 221a and the second rotary bearing 221b are respectively arranged in the shaft sleeve 22. A first check ring 222a for axially limiting the first rotary bearing 221a is arranged in one end, close to the air expansion shaft 21, of the shaft sleeve 22, a second check ring 222b for axially limiting the second rotary bearing 221b is arranged in the shaft sleeve 22, and the second check ring 222b is located between the first rotary bearing 221a and the second rotary bearing 2221 b. The first retainer ring 222a and the second retainer ring 222b are snap springs. The shaft head shields 23 and the shaft sleeves 22 of the two shaft heads 211 are respectively accommodated in U-shaped grooves 241 at one ends of the two unreeling fixing bases 24, the openings of the U-shaped grooves 241 face to the left, and the other ends of the two unreeling fixing bases 24 are respectively arranged at the inner sides of the two vertical plates 12. The top of unreeling fixing base 24 is equipped with unreeling cylinder 25 that corresponds with axle sleeve 22, unreels cylinder 25 and is used for being connected with the PLC electricity. The output shaft of the unreeling cylinder 25 penetrates through the through hole 242 of the unreeling fixed seat 24, a fixed block 251 is arranged at the tail end of the output shaft of the unreeling cylinder 25, one end of the fixed block 251 away from the unreeling cylinder 25 is provided with an arc surface 2511, and the arc surface 2511 is used for propping against the outer peripheral surface of the corresponding shaft sleeve 22. The unreeling cylinder 25 is used for driving the fixed block 251 to move up and down so as to make the arc surface 2511 of the fixed block 251 abut against the outer peripheral surface of the corresponding shaft sleeve 22 or to separate the arc surface 2511 of the fixed block 251 from the outer peripheral surface of the corresponding shaft sleeve 22. In practical application, in the initial position, the cambered surface 2511 of the fixing block 251 is separated from the outer circumferential surface of the corresponding shaft sleeve 22, after the diaphragm 200 is mounted on the air expansion shaft 21, when the diaphragm 200 is to be unreeled, the shaft head shield 23 of one of the shaft heads 211 is manually rotated from the U-shaped groove 241 of one of the unreeled fixing seats 24, so that the air expansion shaft 21 can be driven to rotate through the corresponding shaft head 211, the diaphragm 200 can be unreeled through the rotation of the air expansion shaft 21, when the diaphragm 200 needs to be stopped from being unreeled after the diaphragm 200 is carried for a preset distance, the shaft head shield 23 of one of the shaft heads 211 is stopped, and then the fixing block 251 is driven to move downwards through the unreeled cylinders 25 at the top ends of the two unreeled fixing seats 24, so that the cambered surface 2511 of the fixing block 251 is propped against the outer circumferential surface of the corresponding shaft sleeve 22, the corresponding shaft sleeve 22 can be pressed against the inner wall of the lower side of the U-shaped groove 241 of the corresponding unreeled fixing seat 24, the two shaft heads 211 can be fixed, and the air expansion shaft 21 can be further fixed, and the diaphragm 21 can be prevented from moving left and right. When the diaphragm 200 needs to be unreeled again, the fixed block 251 is driven to move upwards by the unreeled cylinder 25, so that the cambered surface 2511 of the fixed block 251 is separated from the outer circumferential surface of the corresponding shaft sleeve 22, and then the shaft head shield 23 of one of the shaft heads 211 is manually rotated, so that the diaphragm 200 can be unreeled again by the air expansion shaft 21.

The first support roller 30a, the second support roller 30b, and the third support roller 30c are respectively used to support the diaphragm 200. The both ends of the first supporting roller 30a, the both ends of the second supporting roller 30b, and the both ends of the third supporting roller 30c are rotatably provided inside the two risers 12 through a bearing housing, respectively. The first support roller 30a, the second support roller 30b and the third support roller 30c are the same in size and shape. The top of the roll surface of the first supporting roller 30a and the top of the roll surface of the second supporting roller 30b are positioned on the same horizontal line, and the third supporting roller 30c is positioned below the first supporting roller 30a and the second supporting roller 30 b.

As shown in connection with fig. 3, the taping platform 40 is used for reel-to-reel taping and break taping of the membrane 200. The tape splicing platform 40 comprises a platform body 41, two compression bars 42 which are arranged in a front-back opposite mode, and two tape splicing cylinders 43. The both ends of the platform body 41 are respectively provided inside the two risers 12. The two compression bars 42 are respectively located above the platform body 41 and respectively correspond to two sides of the platform body 41. Two tape receiving cylinders 43 are respectively provided at the bottom ends of the platform body 41 and are respectively electrically connected with the PLC controller. The two tape receiving cylinders 43 correspond to the two pressing bars 42, respectively. The platform body 41 is provided with two through holes, the two through holes respectively correspond to the two belt receiving air cylinders 43, and the tail ends of the output shafts of the two belt receiving air cylinders 43 respectively pass through the corresponding through holes and are respectively connected with the corresponding compression bars 42. The two tape receiving cylinders 43 are respectively used for driving the corresponding compression bars 42 to move up and down. In practical application, for example, when a roll is replaced and a tape is connected, the diaphragm 200 passes through between the two compression rods 42 and the platform body 41, when the tape is required to be connected, the tail end of the previous diaphragm 200 and the head end of the next diaphragm 200 are respectively arranged at the top end of the platform body 41 and are in butt joint, then the corresponding compression rods 42 are respectively driven to move downwards through the two tape connecting cylinders 43, so that the previous diaphragm 200 and the next diaphragm 200 are respectively compressed at the top end of the platform body 41 through the two compression rods 42, then adhesive tapes are adhered between the tail end of the previous diaphragm 200 and the head end of the next diaphragm 200, and then the corresponding compression rods 42 are respectively driven to move upwards through the two tape connecting cylinders 43, so that the previous diaphragm 200 and the next diaphragm 200 are respectively released, and the tape connection is finished. The working principle of the broken tape splicing is the same as that of the reel-changing splicing, and the description is omitted here.

As shown in fig. 4, the first guide roller 50 and the second guide roller 60 are used to support and guide the diaphragm 200, respectively. The first guide roller 50 and the second guide roller 60 have the same size and shape, and the vertex of the roller surface of the first guide roller 50 and the vertex of the roller surface of the second guide roller 60 are positioned on the same horizontal line. The first guide roller 50 and the second guide roller 60 are positioned above the third support roller 30 c.

The differential screw mechanism 70 includes two mounting seats 71 disposed opposite to each other in a left-right direction, two screw assemblies disposed opposite to each other in a left-right direction, and a driving assembly.

The two mounting seats 71 are provided on the inner sides of the two risers 12, respectively. The two screw rod assemblies are respectively arranged at the top ends of the two mounting seats 71, the first guide roller 50 and the second guide roller 60 are positioned between the two screw rod assemblies, the two ends of the first guide roller 50 and the two ends of the second guide roller 60 are respectively connected with the two screw rod assemblies, and the driving assembly is used for driving the first guide roller 50 and the second guide roller 60 to move oppositely or back through the two screw rod assemblies. By the opposite movement or the reverse movement of the first guide roller 50 and the second guide roller 60, the distance between the first guide roller 50 and the second guide roller 60 can be adjusted, so that the laser detection mechanism 80 can conveniently perform laser scanning on the surface of the diaphragm 200 positioned between the first guide roller 50 and the second guide roller 60.

In this embodiment, the screw assembly includes a first screw 72, a second screw 73, a first slider seat 74, and a second slider seat 75. The first screw 72 and the second screw 73 are sequentially disposed from front to rear. The two ends of the first screw rod 72 are respectively rotatably arranged at the top ends of the corresponding mounting seats 71, specifically, the top ends of the mounting seats 71 are provided with two first mounting plates 711 which are arranged in a front-back opposite mode, the first screw rod 72 is located between the two first mounting plates 711, the first mounting plates 711 are provided with first hole sites, the two ends of the first screw rod 72 respectively penetrate through the first hole sites of the two first mounting plates 711, bearings are arranged in the first hole sites, and the bearing sleeves are arranged on the peripheries of the corresponding ends of the first screw rod 72. The two ends of the second screw rod 73 are respectively rotatably arranged at the top ends of the corresponding mounting seats 71, specifically, the top ends of the mounting seats 71 are provided with two second mounting plates 712 which are arranged in a front-back opposite mode, the second screw rod 73 is located between the two second mounting plates 712, the second mounting plates 712 are provided with second hole sites, the two ends of the second screw rod 73 respectively penetrate through the second hole sites of the two second mounting plates 712, bearings are arranged in the second hole sites, and the bearings are sleeved on the peripheries of the corresponding ends of the second screw rod 73. One end of the first screw 72 and one end of the second screw 73, which are close to each other, are connected through a coupling 76. The thread direction of the first screw 72 is opposite to the thread direction of the second screw 73. The first slider seat 74 is in threaded engagement with the first screw 72, and the second slider seat 75 is in threaded engagement with the second screw 73. The first guide roller 50 is located between the first screws 72 of the two screw assemblies, and both ends of the first guide roller 50 are respectively connected with the first slider seats 74 of the two screw assemblies. The second guide roller 60 is located between the second screws 73 of the two screw assemblies, and both ends of the second guide roller 60 are respectively connected with the second slider seats 75 of the two screw assemblies.

The driving assembly includes a connecting rod 77 and a hand wheel 78, the connecting rod 77 is rotatably disposed at one end, such as the front end, of the two mounting seats 71, and the connecting rod 77 is adjacent to the first screw 72 of the two screw assemblies. Specifically, among the four first mounting plates 711 of the two mounting seats 71, two third mounting plates 713 are respectively disposed on the two first mounting plates 711 located in front, the third mounting plates 713 are provided with third hole sites, the connecting rod 77 penetrates through the third hole sites of the two third mounting plates 713, bearings are disposed in the third hole sites, and the bearing sleeves are disposed on the periphery of the connecting rod 77. A first bevel gear 791 is sleeved on the outer periphery of one end, far away from the second screw rod 73, of the first screw rod 72, a second bevel gear 792 meshed with the first bevel gear 791 is sleeved on the outer periphery of the connecting rod 77, and a hand wheel 78 is connected to one end, such as the right end, of the connecting rod 77. In practical application, the hand wheel 78 is manually rotated, so that the connecting rod 77 can be driven to rotate, the second bevel gear 792 can be driven to rotate by the rotation of the connecting rod 77, the corresponding first bevel gear 791 can be driven to rotate, the corresponding first screw rod 72 and second screw rod 73 can be driven to rotate, the rotation directions of the first screw rod 72 and the second screw rod 73 are opposite, the rotation of the first screw rod 72 and the second screw rod 73 can drive the first sliding block seat 74 and the second sliding block seat 75 to move towards each other or away from each other, and the first guiding roller 50 and the second guiding roller 60 can be driven to move towards each other or away from each other.

Referring to fig. 5, the laser detection mechanism 80 is configured to perform laser scanning on the surface of the diaphragm 200 along the width direction of the diaphragm 200, and uses the principle of laser reflection ranging to measure the displacement difference, so as to implement tension uniformity detection on the diaphragm 200. The laser detection mechanism 80 is located above the line between the apex of the roll surface of the first guide roller 50 and the apex of the roll surface of the second guide roller 60.

The laser detection mechanism 80 includes two detection fixing bases 81, a detection mounting plate 82, a detection linear module 83, and a laser displacement sensor 84. The two detection fixing bases 81 are oppositely arranged left and right, and the two detection fixing bases 81 are respectively arranged at the top ends of the two vertical plates 12. The two ends of the detection mounting plate 82 are respectively disposed on the two detection fixing seats 81. The detection linear module 83 is disposed on a side of the detection mounting plate 82, such as the front side, and the laser displacement sensor 84 is disposed on a side of the detection linear module 83 away from the detection mounting plate 82 via the sensor fixing plate 841, and the laser displacement sensor 84 is adjacent to the riser 12 located on the left. The detection linear module 83 and the laser displacement sensor 84 are respectively electrically connected with the PLC controller. The laser displacement sensor 84 is located above and corresponds to the center of the line between the apex of the roll surface of the first guide roller 50 and the apex of the roll surface of the second guide roller 60. The detection linear module 83 is used to drive the laser displacement sensor 84 to move left and right in the width direction of the diaphragm 200 through the sensor fixing plate 841. The length of the detecting linear module 83 is greater than the width of the diaphragm 200. In practical application, the laser displacement sensor 84 is driven to move along the width direction of the diaphragm 200 through the detection linear module 83, so that the laser scanning can be performed on the surface of the diaphragm 200 through the laser displacement sensor 84, the transverse height difference of the surface of the diaphragm 200 can be obtained, the height difference is output to the PLC, and then the height difference can be converted into the tension uniformity difference of the diaphragm 200 through the PLC, so that the tension uniformity detection result of the diaphragm 200 is obtained, whether the diaphragm 200 meets the production requirement can be judged according to the tension uniformity result, meanwhile, the PLC can generate a flatness curve according to the tension uniformity difference, and the flatness curve can be displayed through a display screen electrically connected with the PLC, so that production personnel can know the detection condition conveniently.

In this embodiment, the top end of the detection linear module 83 is sequentially provided with a first groove-type photoelectric switch 85a, a second groove-type photoelectric switch 85b and a third groove-type photoelectric switch 85c along the length direction of the detection linear module 83 from left to right, the first groove-type photoelectric switch 85a and the third groove-type photoelectric switch 85c are respectively close to two ends of the detection linear module 83, and the second groove-type photoelectric switch 85b is close to the first groove-type photoelectric switch 85 a. The first, second and third groove-type photoelectric switches 85a, 85b and 85c are respectively electrically connected to the PLC controller. The top end of the sensor fixing plate 841 is provided with a sensing piece 86, such as a sheet metal part, and the sensing piece 86 can move synchronously with the sensor fixing plate 841, and one end of the sensing piece 86, which is close to the detection mounting plate 82, can pass through the sensing groove of the first groove-type photoelectric switch 85a, the sensing groove of the second groove-type photoelectric switch 85b and the sensing groove of the third groove-type photoelectric switch 85 c. The distance between the second groove-type photoelectric switch 85b and the third groove-type photoelectric switch 85c is greater than the width of the diaphragm 200. In practical application, in the initial position, one end of the sensing piece 86, which is close to the detection mounting plate 82, is located in the sensing groove of the first groove type photoelectric switch 85a, and in the process that the detection linear module 83 drives the sensor fixing plate 841 to move rightward, when one end of the sensing piece 86, which is close to the detection mounting plate 82, is located in the sensing groove of the second groove type photoelectric switch 85b, the second groove type photoelectric switch 85b outputs a signal to the PLC controller, so that the laser displacement sensor 84 can be controlled by the PLC controller to start up, and when one end of the sensing piece 86, which is close to the detection mounting plate 82, is located in the sensing groove of the third groove type photoelectric switch 85c, the third groove type photoelectric switch 85c outputs a signal to the PLC controller, so that the detection linear module 83 can be controlled by the PLC controller to stop working. When one end of the sensing piece 86, which is close to the detection mounting plate 82, is located in the sensing groove of the third groove type photoelectric switch 85c and drives the laser displacement sensor 84 to move leftwards through the detection linear module 83, when one end of the sensing piece 86, which is close to the detection mounting plate 82, is located in the sensing groove of the second groove type photoelectric switch 85b, the second groove type photoelectric switch 85b outputs a signal to the PLC controller, so that the laser displacement sensor 84 can be controlled to stop working through the PLC controller, and when one end of the sensing piece 86, which is close to the detection mounting plate 82, is located in the sensing groove of the first groove type photoelectric switch 85a, the first groove type photoelectric switch 85a outputs a signal to the PLC controller, so that the detection linear module 83 can be controlled to stop working through the PLC controller.

The two balancing weights 90 are respectively used for magnetically attracting and connecting the two sides of the head end of the diaphragm 200 at the middle positions. Specifically, a magnetic attraction piece, such as a magnet, is respectively disposed on the two balancing weights 90, and the magnetic attraction pieces of the two balancing weights 90 are respectively used for magnetically attracting the middle positions of the two sides of the head end of the diaphragm 200. In practical application, a magnetic attraction piece such as a magnet is installed at the middle position of the two sides of the head end of the diaphragm 200, and then the magnetic attraction pieces of the two balancing weights 90 and the magnetic attraction pieces of the two sides of the head end of the diaphragm 200 are magnetically connected together. The balancing weight 90 that sets up is convenient for diaphragm 200 to produce the tension, and the laser detection mechanism 80 of being convenient for carries out laser scanning to the surface of diaphragm 200 along the width direction of diaphragm 200, has guaranteed accuracy, the precision of detection, adopts the magnetism to inhale the mode of connection, is convenient for change balancing weight 90 of different weights, is convenient for adjust the tension of diaphragm 200 like this.

With the above structure, after installing the diaphragm 200 on the air-expanding shaft 21, the shaft head shield 23 of one of the shaft heads 211 is manually rotated, so that the air-expanding shaft 21 is driven to rotate, and the unwinding of the diaphragm 200 is realized by the air-expanding shaft 21, the head end of the unwound diaphragm 200 can pass over the first supporting roller 30a, then pass between the two compression bars 42 and the platform body 41, then pass over the second supporting roller 30b, pass under the third supporting roller 30c, pass over the first guiding roller 50, pass over the second guiding roller 60, then stop rotating the shaft head shield 23 of the unwinding mechanism 20, and the fixing block 251 is driven to move downwards by the unwinding cylinder 25, so that the cambered surface 2511 of the fixing block 251 is abutted against the outer circumferential surface of the corresponding sleeve 22, and the corresponding sleeve 22 can be pressed on the lower inner wall of the U-shaped groove 241 of the corresponding unwinding fixing seat 24, so that the air-expanding shaft 21 can be fixed to prevent the diaphragm 21 from moving left and right. And then two balancing weights 90 are magnetically connected to the middle positions of the two sides of the front end of the diaphragm 200, so that the diaphragm 200 generates tension, and the front end of the diaphragm 200 is perpendicular to the second guide roller 60. Then, the laser displacement sensor 84 is driven to move rightward by the detection linear module 83, so that the laser scanning of the surface of the diaphragm 200 can be realized by the laser displacement sensor 84. After the completion, the fixing block 251 is driven to move upward by the unreeling cylinder 25, so that the arc surface 2511 of the fixing block 251 is separated from the outer peripheral surface of the corresponding shaft sleeve 22. Then, the spindle head shield 23 of one of the spindle heads 211 is manually rotated so as to drive the air expansion shaft 21 to rotate, so that the diaphragm 200 can be unreeled again through the air expansion shaft 21, after the diaphragm 200 is carried by a preset distance, the spindle head shield 23 of the unreeling mechanism 20 stops rotating, and the fixed block 251 is driven to move downwards through the unreeling cylinder 25, so that the cambered surface 2511 of the fixed block 251 is propped against the outer circumferential surface of the corresponding spindle sleeve 22 again. The laser displacement sensor 84 is then driven to move leftwards by the detection linear module 83, so that the laser displacement sensor 84 can perform laser scanning again on the surface of the diaphragm 200. The method is carried out according to the steps, so that tension uniformity detection can be carried out on the material fed to the diaphragm 200.

According to the utility model, the unreeling mechanism 20, the first guide roller 50, the second guide roller 60, the laser detection mechanism 80 and the two balancing weights 90 are arranged, the unreeling mechanism 20 can be used for unreeling the diaphragm 200, the first guide roller 50 and the second guide roller 60 can be used for respectively supporting and guiding the diaphragm 200, the laser detection mechanism 80 can be used for carrying out laser scanning on the surface of the diaphragm 200 along the width direction of the diaphragm 200, so that the transverse height difference of the surface of the diaphragm 200 can be achieved, the tension uniformity detection result of the diaphragm 200 can be obtained, whether the diaphragm 200 meets the production requirement can be judged according to the tension uniformity result, the two balancing weights 90 can be used for enabling the diaphragm 200 to generate tension, the laser detection mechanism 80 can conveniently carry out laser scanning on the surface of the diaphragm 200 along the width direction of the diaphragm 200, the accuracy and precision of detection are ensured, the differential screw mechanism 70 can be used for conveniently adjusting the distance between the first guide roller 50 and the second guide roller 60, and the laser detection mechanism 80 can conveniently carry out laser scanning on the surface of the diaphragm 200 between the first guide roller 50 and the second guide roller 60. Through unreeling cylinder 25 and fixed block 251 of unreeling mechanism 20, can fix air inflation shaft 21 in the in-process that laser detection mechanism 80 detected, can prevent that air inflation shaft 21 from driving diaphragm 200 and moving about, guaranteed the accuracy of testing result. The utility model can realize tension uniformity detection on the material fed by the diaphragm 200, has simple structure, small volume, small occupied space, easy operation and low cost. Meanwhile, the unreeling mechanism 20 of the utility model adopts a manual rotation air expansion shaft 21 to realize unreeling of the diaphragm 200, and compared with the prior art which adopts a motor, a speed reducer and a synchronous belt assembly to drive the air expansion shaft, the unreeling mechanism of the utility model further simplifies the structure and reduces the cost.

While the preferred embodiment of the present utility model has been described in detail, the present utility model is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model, and the equivalent modifications or substitutions are included in the scope of the present utility model as defined in the appended claims.

Claims

1. The utility model provides a diaphragm surface feature detection device for lithium cell, its characterized in that, including unreeling mechanism, first direction roll of crossing, second direction roll of crossing, laser detection mechanism and two balancing weights, unreeling mechanism, first direction roll of crossing and second direction roll of crossing set gradually from the front to the back along the walking route of diaphragm, the vertex that the roll surface was crossed in first direction and the vertex that the roll surface was crossed in second direction lie in same horizontal line, laser detection mechanism is located the top of the line between roll surface vertex is crossed in first direction roll surface vertex and the roll surface vertex is crossed in second direction, two balancing weights are used for the magnetism respectively to inhale the intermediate position department of connecting at the two sides of diaphragm head end.

2. The device for detecting the surface characteristics of the lithium battery diaphragm according to claim 1, wherein the laser detection mechanism comprises two detection fixing seats, a detection mounting plate, a detection linear module and a laser displacement sensor, the two detection fixing seats are oppositely arranged left and right, two ends of the detection mounting plate are respectively arranged on the two detection fixing seats, the detection linear module is arranged on one side of the detection mounting plate, the laser displacement sensor is arranged on one side, far away from the detection mounting plate, of the detection linear module, the laser displacement sensor is positioned above a connecting line between the first guide roller surface vertex and the second guide roller surface vertex and corresponds to the center of the connecting line, and the detection linear module is used for driving the laser displacement sensor to move left and right along the width direction of the diaphragm.

3. The diaphragm surface feature detection device for a lithium battery according to claim 1, wherein the unreeling mechanism comprises an air expansion shaft, two shaft heads are respectively formed at two ends of the air expansion shaft, a shaft head shield is connected to the tail ends of the shaft heads, a shaft sleeve is rotatably sleeved on the periphery of the shaft heads, the shaft sleeve is positioned between the air expansion shaft and the shaft head shield, the shaft head shield and the shaft sleeve are accommodated in a U-shaped groove at one end of an unreeling fixing seat, an unreeling cylinder corresponding to the shaft sleeve is arranged at the top end of the unreeling fixing seat, an output shaft of the unreeling cylinder penetrates through a through hole of the unreeling fixing seat and is provided with a fixing block at the tail end of the output shaft of the unreeling cylinder, the fixing block is provided with an arc surface, the arc surface is used for being propped against the outer peripheral surface of the corresponding shaft sleeve, and the unreeling cylinder is used for driving the fixing block to move up and down so that the arc surface of the fixing block is propped against the outer peripheral surface of the corresponding shaft sleeve or the arc surface of the fixing block is separated from the outer peripheral surface of the corresponding shaft sleeve.

4. The device for detecting the surface characteristics of the diaphragm for the lithium battery according to claim 1, further comprising a differential screw rod mechanism, wherein the differential screw rod mechanism comprises two mounting seats which are oppositely arranged left and right, two screw rod assemblies which are oppositely arranged left and right and a driving assembly, the two screw rod assemblies are respectively arranged at the top ends of the two mounting seats, the first guide roller and the second guide roller are positioned between the two screw rod assemblies, two ends of the first guide roller and two ends of the second guide roller are respectively connected with the two screw rod assemblies, and the driving assembly is used for driving the first guide roller and the second guide roller to move oppositely or back by the two screw rod assemblies.

5. The device for detecting the surface characteristics of the diaphragm for the lithium battery according to claim 4, wherein the screw rod assembly comprises a first screw rod, a second screw rod, a first sliding block seat and a second sliding block seat, the first screw rod and the second screw rod are sequentially arranged from front to back, two ends of the first screw rod and two ends of the second screw rod are respectively rotatably arranged at the top ends of corresponding mounting seats, the thread directions of the first screw rod and the thread directions of the second screw rod are opposite, one ends, close to each other, of the first screw rod and the second screw rod are connected through a coupler, the first sliding block seat is in threaded fit with the first screw rod, the second sliding block seat is in threaded fit with the second screw rod, the first guide roller passing ends are respectively connected with the first sliding block seats of the two screw rod assemblies, the second guide roller passing ends are respectively connected with the second sliding block seats of the two screw rod assemblies.

6. The device for detecting surface characteristics of a lithium battery diaphragm according to claim 5, wherein the driving assembly comprises a connecting rod and a hand wheel, the connecting rod is rotatably arranged at one ends of the two installation seats, the connecting rod is close to the first screw rod of the two screw rod assemblies, a first bevel gear is sleeved on the periphery of one end, far away from the second screw rod, of the first screw rod, a second bevel gear meshed with the first bevel gear is sleeved on the periphery of the connecting rod, and one end of the connecting rod is connected with the hand wheel.

7. The device for detecting the surface characteristics of the diaphragm for the lithium battery according to claim 1, wherein the two balancing weights are respectively provided with a magnetic attraction piece, and the magnetic attraction pieces of the two balancing weights are respectively used for magnetically attracting and connecting the two balancing weights at the middle positions of the two sides of the head end of the diaphragm.

8. The separator surface feature detection device for a lithium battery according to claim 1, further comprising three supporting rollers, wherein the three supporting rollers are a first supporting roller, a second supporting roller and a third supporting roller, and the first supporting roller, the second supporting roller and the third supporting roller are sequentially arranged between the unreeling mechanism and the first guiding roller along a travelling path of the separator.

9. The separator surface feature detection device for a lithium battery of claim 8, further comprising a tape deck disposed between the first support roller and the second support roller along a path of travel of the separator.

10. The device for detecting the surface characteristics of the diaphragm for the lithium battery according to claim 9, wherein the belt connecting platform comprises a platform body, two compression bars which are arranged in a front-back opposite mode and two belt connecting air cylinders, the two compression bars are respectively located above the platform body, the two belt connecting air cylinders are respectively arranged at the bottom end of the platform body and respectively correspond to the two compression bars, the platform body is provided with two through holes, the two through holes respectively correspond to the two belt connecting air cylinders, the tail ends of output shafts of the two belt connecting air cylinders respectively penetrate through the corresponding through holes and are connected with the corresponding compression bars, and the two belt connecting air cylinders are respectively used for driving the corresponding compression bars to move up and down.