Lithium battery diaphragm cutting and winding equipment

Abstract

The invention discloses lithium battery diaphragm cutting and winding equipment which comprises a shell and further comprises a winding assembly, the winding assembly is arranged in the shell, the winding assembly is mainly composed of a round pipe, an adjusting pipe and two winding rollers, and the round pipe and the adjusting pipe are arranged in the shell in a relatively rotating mode; the two winding rollers are oppositely arranged on the upper side and the lower side of the adjusting pipe, and each winding roller is mainly composed of a plurality of inner pipes, a plurality of sleeves and two outer pipes. When the improved lithium battery diaphragm cutting and winding equipment is used, after the lithium battery diaphragm wound by the winding rollers reaches a corresponding amount, the cutting operation of the lithium battery diaphragm can be automatically completed, and the position of the end part of the lithium battery diaphragm can be adjusted, so that the lithium battery diaphragm is wound on the other winding roller, and when the lithium battery diaphragm is unloaded, the lithium battery diaphragm can be automatically cut off. And the device does not need to be stopped, so that the winding efficiency of the lithium battery diaphragm is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery diaphragm winding equipment, and in particular to a lithium battery diaphragm cutting and winding equipment. Background Art

[0002] Lithium battery separator is one of the key inner components of lithium battery and is the separator of positive and negative electrode active materials. During the production process of lithium battery separator, it is generally stored in a wound manner. The lithium battery separator of appropriate length and width is rolled into a lithium battery separator roll through a cutting and winding device to facilitate the use of the lithium battery separator.

[0003] During the use of existing lithium battery diaphragm cutting and winding equipment, the slitting device slits the lithium battery diaphragm into the required width, and then the slitting lithium battery diaphragm is wound on the winding roller by a rotating winding roller. After the lithium battery diaphragm on the winding roller reaches a predetermined amount, the operator often needs to stop the machine to complete the unloading operation of the lithium battery diaphragm, which reduces the winding efficiency of the lithium battery diaphragm. When unloading the lithium battery diaphragm, the winding roller often needs to be disassembled. At the same time, there are often multiple lithium battery diaphragm rolls wrapped around the winding roller, and the operator is required to pull the lithium battery diaphragm roll off from a longer winding roller. The operation is more troublesome and increases the labor intensity of the operator. Summary of the invention

[0004] The object of the present invention is to provide a lithium battery separator cutting and winding device so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a lithium battery separator cutting and winding device, comprising a housing, and further comprising: A winding assembly, wherein the winding assembly is arranged in an outer shell, the winding assembly is mainly composed of a circular tube, an adjusting tube and two winding rollers, and the circular tube and the adjusting tube are relatively rotatably installed in the outer shell, the two winding rollers are relatively arranged at the upper and lower sides of the adjusting tube, the winding rollers are mainly composed of a plurality of inner tubes, a plurality of sleeves and two outer tubes, the two outer tubes are relatively arranged, and the plurality of inner tubes are arranged between the corresponding two outer tubes, the outer tube is fixedly connected to the corresponding inner tube, and the two adjacent inner tubes are connected by a connecting mechanism, the sleeve is slidably sleeved on the outer circumference of the corresponding inner tube, a plurality of second adsorption holes are jointly opened on the tube wall of the sleeve and the tube wall of the inner tube in a circumferential array, and a plurality of first adsorption holes are opened on the outer circumferential wall of the circular tube in a circumferential array; Two adjustment components, the two adjustment components are relatively arranged on the upper and lower sides of the two winding rollers, and the adjustment components adjust the vertical position of the inner tube; A cutting assembly, which is arranged on the round tube and cuts the lithium battery diaphragm; Two driven air extraction components are arranged on the outer peripheral side of the two winding rollers, and the driven air extraction components drive the circular tube, the regulating tube and the two winding rollers to rotate, and continuously extract the gas in the circular tube, the regulating tube and the two winding rollers.

[0006] Preferably, the outer circumferential wall of the circular tube is gap-matched with the outer circumferential wall of the adjusting tube, and a plurality of limit strips are fixedly mounted on the outer circumferential wall of the inner tube in a circular array, and each limit strip is slidably inserted into the tube wall of the corresponding sleeve.

[0007] Preferably, a guide groove is provided on the outer wall of the shell at a position corresponding to the outer tube, and the outer tube passes through the corresponding guide groove and contacts the inner wall of the corresponding guide groove.

[0008] Preferably, the connecting mechanism includes a limiting tube, one end of the limiting tube is square tube-shaped, and the outer ring edge of the one end of the limiting tube is arc-shaped, and the other end of the limiting tube is circular tube-shaped, and the limiting tube is slidably installed in the opening of one end of the corresponding inner tube, and a limiting groove is provided on the other side of the inner tube, and the arc-shaped end of the limiting tube is inserted into the corresponding limiting groove and contacts with the inner wall of the corresponding limiting groove, and a first spring is provided between the limiting tube and the inner wall of the corresponding inner tube, and the two ends of the first spring are respectively in contact with the inner wall of the corresponding inner tube and the corresponding limiting tube.

[0009] Preferably, the cutting assembly includes a cutter, a storage hole is opened on the outer wall of the circular tube, and the interior of the storage hole is communicated with the interior of the circular tube, the cutter is slidably installed in the storage hole, a first piston plate is fixedly installed on the back end of the cutter, and the outer wall of the first piston plate is in contact with the inner wall of the storage hole, and an electric-controlled valve is rotatably installed on the open end of the circular tube.

[0010] Preferably, the adjusting assembly includes a plurality of support plates, one end of the support plate is rotatably sleeved on the outer circumference of the corresponding inner tube through a bearing, two fixed blocks are relatively fixedly installed in the outer shell by bolts, a storage groove is opened in the fixed block, and the other end of the support plate is inserted into the corresponding storage groove, a second piston plate is fixedly installed on the other end of the support plate, and the outer circumferential wall of the second piston plate is in contact with the inner wall of the corresponding storage groove, an air pump is fixedly installed in the storage groove, and the exhaust end of the air pump extends to the outside of the corresponding fixed block, two second springs are relatively arranged between the second piston plate and the inner wall of the corresponding storage groove, and the two ends of each second spring are respectively fixedly connected to the corresponding second piston plate and the inner wall of the corresponding storage groove.

[0011] Preferably, a pressure limiting valve is fixedly mounted on a side of the fixed block away from the air pump, and an air inlet end of the pressure limiting valve is inserted into a corresponding storage tank.

[0012] Preferably, a plurality of first limit blocks and a plurality of second limit blocks are fixedly installed at the positions corresponding to the second piston plate in the storage groove, and the first limit blocks and the second limit blocks are both located between the corresponding two second springs, the second limit block is located between the corresponding two first limit blocks, and the length of the second limit block is greater than that of the first limit block.

[0013] Preferably, the driving air extraction component includes a protective shell, and the two protective shells are relatively fixedly installed on the outer wall of the shell at positions corresponding to the circular tube and the adjusting tube, and the interiors of the two protective shells are communicated with the interior of the adjusting tube, and two soft tubes are connected and installed on the upper and lower sides of the protective shell, and the air inlet end of each soft tube is inserted into the corresponding outer tube and rotatably connected to the corresponding outer tube, and the two ends of the circular tube rotate through the shell wall of the protective shell, and the two ends of the circular tube and the adjusting tube are fixedly sleeved with external gear rings, and two adjacent external gear rings are meshingly connected, and the external gear ring is located in the corresponding protective shell, and a motor is fixedly installed on the inner side wall of the shell, and a driving gear is fixedly installed on the driving end of the motor, and the driving gear is meshingly connected with the corresponding external gear ring, and two drivers are relatively arranged in the shell, and the shell wall of the driver is fixedly connected to the corresponding support plate, and the driving gear ring of the driver is fixedly sleeved on the outer peripheral side of the corresponding outer tube.

[0014] Preferably, two exhaust pipes are relatively fixedly installed on the side wall of the protective shell, a transmission gear is rotatably installed on the outer wall of the shell at the position corresponding to the exhaust pipe, and the transmission gear is meshingly connected with the corresponding outer gear ring, an impeller is provided in the exhaust pipe, and the impeller is fixedly connected with the corresponding transmission gear, and the impeller is gap-matched with the inner wall of the corresponding exhaust pipe.

[0015] The present invention has at least the following beneficial effects: 1. When the improved lithium battery separator cutting and winding device is used, after the lithium battery separator wound on the winding roller reaches the corresponding amount, the lithium battery separator can be automatically cut off, and the position of the end of the lithium battery separator can be adjusted so that the lithium battery separator is wound onto another winding roller, so that when the lithium battery separator is unloaded, the device does not need to be shut down, thereby improving the winding efficiency of the lithium battery separator; 2. After the above-mentioned lithium battery diaphragm cutting operation is completed, as the adjusting mechanism adjusts the position of the winding roller, the lithium battery diaphragm on the winding roller is separated from the lithium battery diaphragm on the adjusting tube to prevent the lithium battery diaphragm on the winding roller from affecting the winding operation of the lithium battery diaphragm on the adjusting tube. Subsequently, the winding roller is automatically split into several parts, and several inner tubes are misaligned. At this time, the operator can directly complete the unloading operation of the lithium battery diaphragm by pulling off the sleeve on the inner tube, which facilitates the unloading process of the device and reduces the labor intensity of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0017] Figure 1 It is a front view of the overall structure of the present invention; Figure 2 It is a three-dimensional diagram of the overall structure of the present invention; Figure 3 It is a three-dimensional diagram of the fixing block, the round tube, the adjusting tube and the winding roller of the present invention; Figure 4 For the present invention Figure 3 The stereogram after rotating 180 degrees counterclockwise; Figure 5 For the present invention Figure 4 A three-dimensional view of the center tube, adjustment tube and winding roller; Figure 6 It is a three-dimensional diagram of the internal structure of the round tube, the adjusting tube and the winding roller of the present invention; Figure 7 A three-dimensional diagram of a portion of the support plate, inner tube, outer tube and sleeve of the present invention; Figure 8 It is a front view of the internal structure of the circular tube of the present invention; Fig. 9 A three-dimensional diagram of the internal structure of the fixing block of the present invention; Fig.10 It is a stereoscopic view of the outer gear ring, the driving gear and the gear ring of the present invention.

[0018] In the figure: 1, shell; 2, winding assembly; 21, round tube; 22, adjusting tube; 23, winding roller; 231, inner tube; 232, sleeve; 233, outer tube; 234, limit strip; 24, connecting mechanism; 241, limit tube; 242, limit groove; 243, first spring; 25, first adsorption hole; 26, second adsorption hole; 27, guide groove; 3, cutting assembly; 31, storage hole; 32, cutter; 33, first piston plate; 34 , electric control valve; 4, adjustment component; 41, support plate; 42, fixing block; 43, storage tank; 44, second piston plate; 45, air pump; 46, second spring; 47, pressure limiting valve; 48, first limit block; 49, second limit block; 5, drive exhaust component; 51, protective shell; 52, soft tube; 53, external gear ring; 54, motor; 55, drive gear; 56, driver; 57, exhaust pipe; 58, transmission gear; 59, impeller. DETAILED DESCRIPTION

[0019] In order to make the technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] The present invention provides a technical solution: referring to Figure 1 - Figure 8 The present invention discloses a lithium battery separator cutting and winding device, comprising a housing 1, and further comprising: The winding assembly 2 is arranged in the shell 1. The winding assembly 2 is mainly composed of a circular tube 21, an adjusting tube 22 and two winding rollers 23. The circular tube 21 and the adjusting tube 22 are relatively rotatably installed in the shell 1. The two winding rollers 23 are relatively arranged on the upper and lower sides of the adjusting tube 22. The winding roller 23 is mainly composed of a plurality of inner tubes 231, a plurality of sleeves 232 and two outer tubes 233. The two outer tubes 233 are relatively arranged, and the plurality of inner tubes 231 are arranged between the corresponding two outer tubes 233. The outer tube 233 is fixedly connected to the corresponding inner tube 231, and the adjacent two inner tubes 231 are connected by a connecting mechanism 24. The sleeve 232 is slidably sleeved on the outer peripheral side of the corresponding inner tube 231. A plurality of second adsorption holes 26 are jointly provided on the tube wall of the sleeve 232 and the tube wall of the inner tube 231 in a circumferential array, and a plurality of first adsorption holes 25 are provided on the outer peripheral wall of the circular tube 21 in a circumferential array. Two adjustment components 4, the two adjustment components 4 are relatively arranged at the upper and lower sides of the two winding rollers 23, and the adjustment components 4 adjust the vertical position of the inner tube 231; A cutting assembly 3, which is disposed on the round tube 21 and is used to cut the lithium battery separator; Two driving air extraction components 5 are arranged on the outer peripheral side of the two winding rollers 23, and the driving air extraction components 5 drive the circular tube 21, the regulating tube 22 and the two winding rollers 23 to rotate, and continuously extract the gas in the circular tube 21, the regulating tube 22 and the two winding rollers 23.

[0021] In this embodiment, it should be noted that a slitting device is installed in the feed port of the housing 1 to slit the lithium battery separator into several parts of equal width. Figure 5 As shown, the density of the second adsorption holes 26 on the winding roller 23 is higher than the density of the first adsorption holes 25 on the round tube 21; When the improved lithium battery separator cutting and winding device is used, according to Figure 2 As shown, the slitting device slits the lithium battery diaphragm into a plurality of lithium battery diaphragms of equal length, and pushes the slitting lithium battery diaphragms into the positioning mechanism of the slitting device, so that the end of the slitting lithium battery diaphragm moves from the corresponding position in the housing 1 to the top side of the round rod, according to Figure 2-6As shown, the driving mechanism drives the circular tube 21, the regulating tube 22 and the winding roller 23 to rotate at a constant speed, and continuously extracts the gas in the circular tube 21, the regulating tube 22 and the winding roller 23, so that a negative pressure cavity is continuously formed in the circular tube 21, the regulating tube 22 and the winding roller 23, and at the same time, the external gas continuously flows into the circular tube 21 and the winding roller 23 from the first adsorption hole 25 and the second adsorption hole 26 to replenish the gas lost in the circular tube 21 and the winding roller 23; During the process of the circular tube 21 and the regulating tube 22 rotating toward each other, the friction between the rotating circular tube 21 and the end of the lithium battery diaphragm cooperates with the self-weight of the end of the lithium battery diaphragm to send the end of the lithium battery diaphragm into the gap between the circular tube 21 and the end of the regulating tube 22, so that the end of the lithium battery diaphragm is attached to the regulating tube 22. At this time, due to the blocking of the first adsorption hole 25 by the lithium battery diaphragm, an adsorption force can be applied between the lithium battery diaphragm and the regulating tube 22, so that the end of the lithium battery diaphragm is attached to the regulating tube 22. As the regulating tube 22 rotates, the end of the lithium battery diaphragm moves in a circle around the regulating tube 22, and then the end of the lithium battery diaphragm can be directly sent between the regulating tube 22 and the bottom winding roller 23. At this time, due to the blocking of the second adsorption hole 26 by the lithium battery diaphragm, a stronger adsorption force can be formed between the end of the lithium battery diaphragm and the winding roller 23, so that the end of the lithium battery diaphragm is separated from the regulating roller, and the lithium battery diaphragm is attached to the winding roller 23 and rotates with the winding roller 23, and the lithium battery diaphragm is wound on the sleeve 232; according to Figure 3 and Figure 5 As shown, when the winding roller 23 is winding the lithium battery diaphragm, the adjusting component 4 synchronously adjusts the position of the winding roller 23, so that the distance between the winding roller 23 and the adjusting tube 22 is gradually expanded, and space is automatically reserved for the lithium battery diaphragm to be wound on the sleeve 232. After the winding amount of the lithium battery diaphragm on the bottom winding roller 23 reaches the threshold, the cutting component 3 starts to cut the lithium battery diaphragm, and then the end of the lithium battery diaphragm is sent between the circular tube 21 and the adjusting tube 22 again according to the above. As the adjusting tube 22 rotates, the end of the lithium battery diaphragm is sent between the adjusting tube 22 and the top winding roller 23, and the winding operation of the lithium battery diaphragm is continued by the winding roller 23 rotating at the top. The device does not need to be shut down, which improves the winding efficiency of the lithium battery diaphragm. according to Figure 6 and Figure 7As shown, while the above-mentioned lithium battery diaphragm completes the cutting operation, as the bottom winding roller 23 continues to move downward, the distance between the winding roller 23 and the adjusting tube 22 continues to expand, thereby separating the lithium battery diaphragm from the lithium battery diaphragm on the adjusting tube 22, and will not affect the subsequent winding operation of the lithium battery diaphragm. As the winding roller 23 continues to move downward, the connecting mechanism 24 automatically releases the connection state of the plurality of inner tubes 231, so that the plurality of inner tubes 231 automatically complete the staggered splitting. At this time, the operator can directly pull the sleeve 232 off the inner tube 231, so that the operator can complete the winding and unloading operation of the lithium battery diaphragm roll without other operators, which facilitates the unloading processing of the device and reduces the labor intensity of the operator.

[0022] In a further preferred embodiment of the present invention, Figure 6 and Figure 7 As shown, the outer circumferential wall of the circular tube 21 is gap-matched with the outer circumferential wall of the adjusting tube 22, and a plurality of limit strips 234 are fixedly installed on the outer circumferential wall of the inner tube 231 in a circumferential array, and each limit strip 234 is slidably inserted into the tube wall of the corresponding sleeve 232; In this embodiment, it should be noted that the above-mentioned limiting strips 234 are located between the corresponding second adsorption holes 26; according to Figure 6 and Figure 7 As shown, during the unloading process of the lithium battery diaphragm, after the operator pulls off the sleeve 232 from the inner tube 231, the operator then puts a new sleeve 232 on the inner tube 231, and simultaneously inserts the limit bar 234 into the tube wall of the sleeve 232. Due to the mutual interference between the limit bar 234 and the tube wall of the sleeve 232, during the process of the sleeve 232 being put on the inner tube 231, the second adsorption hole 26 on the sleeve 232 coincides with the second adsorption hole 26 on the inner tube 231 and is connected, and the operator does not need to make adjustments. At the same time, during the rotation of the inner tube 231, the sleeve 232 will not rotate on the inner tube 231, and the sleeve 232 rotates together with the inner tube 231, which facilitates the assembly between the sleeve 232 and the inner tube 231 and improves the unloading efficiency of the lithium battery diaphragm.

[0023] In a further preferred embodiment of the present invention, Figure 1 and Figure 2 As shown, a guide groove 27 is provided on the outer wall of the housing 1 at a position corresponding to the outer tube 233, and the outer tube 233 passes through the corresponding guide groove 27 and contacts the inner wall of the corresponding guide groove 27; In this embodiment, according to Figure 1 and Figure 2 As shown, during the process of the distance between the winding roller 23 and the adjusting tube 22 being enlarged, due to the mutual interference between the outer peripheral wall of the outer tube 233 and the inner wall of the guide groove 27, the winding roller 23 moves in a linear track during the movement.

[0024] In a further preferred embodiment of the present invention, Figure 3 , Figure 6 and Figure 7 As shown, the connection mechanism 24 includes a limiting tube 241, one end of the limiting tube 241 is set in a square tube shape, and the outer ring edge of one end of the limiting tube 241 is set in an arc shape, and the other end of the limiting tube 241 is set in a round tube 21 shape. The limiting tube 241 is slidably installed in the opening of one end of the corresponding inner tube 231, and the other side of the inner tube 231 is provided with a limiting groove 242, and the arc surface end of the limiting tube 241 is inserted into the corresponding limiting groove 242 and contacts with the inner wall of the corresponding limiting groove 242. A first spring 243 is provided between the limiting tube 241 and the inner wall of the corresponding inner tube 231, and the two ends of the first spring 243 are respectively in contact with the inner wall of the corresponding inner tube 231 and the corresponding limiting tube 241; In this embodiment, according to Figure 6 and Figure 7 As shown, during the process of splitting the plurality of inner tubes 231, due to the mutual interference between the arc surface of the limiting tube 241 and the inner arc wall of the limiting groove 242, the arc end of the limiting tube 241 can be squeezed out of the limiting groove 242 along the arc surface of the limiting tube 241, and the splitting of the plurality of inner tubes 231 is automatically completed; In the process of the plurality of inner tubes 231 moving to a coaxial state, due to the mutual interference between the arc surface of the limiting tube 241 and the outer ring edge of the sleeve 232, the limiting tube 241 can be squeezed into the inner tube 231 along the arc surface of the limiting tube 241, so that after the plurality of inner tubes 231 form a coaxial state, due to the push of the limiting tube 241 by the first spring 243, the arc end of the limiting tube 241 is automatically inserted into the limiting groove 242, and due to the mutual interference between the outer arc wall of the limiting tube 241 and the inner wall of the limiting groove 242, the connection between the plurality of inner tubes 231 is completed, and the operator does not need to perform other operations, thereby reducing the labor intensity of the operator during the use of the device.

[0025] In a further preferred embodiment of the present invention, Figure 5 , Figure 6 and Figure 8 As shown, the cutting assembly 3 includes a cutter 32, a storage hole 31 is opened on the outer peripheral wall of the circular tube 21, and the interior of the storage hole 31 is communicated with the interior of the circular tube 21, the cutter 32 is slidably installed in the storage hole 31, a first piston plate 33 is fixedly installed on the back end of the cutter 32, and the outer peripheral wall of the first piston plate 33 contacts the inner wall of the storage hole 31, and an electric control valve 34 is rotatably installed at the open end of the circular tube 21; In this embodiment, it should be noted that the end of the electric control valve 34 away from the round tube 21 is connected to the discharge end of the external liquid supply device through a liquid delivery pipe. Figure 6As shown, a sealing ring is installed inside the tube wall of the circular tube 21, and the inner ring wall of the sealing ring contacts the outer wall of the electric control valve 34; After the amount of lithium battery separator rolled on the sleeve 232 reaches a threshold value, Figure 3 and Figure 6 As shown, the electric control valve 34 is opened, and the liquid supply device injects a corresponding amount of filling liquid into the circular tube 21 from the electric control valve 34. Figure 8 As shown, after the filling liquid fills the inside of the round tube 21, part of the filling liquid in the round tube 21 flows into the storage hole 31 and exerts a driving force on the first piston plate 33 to push the cutter 32 out of the storage hole 31. Figure 5 As shown, after the cutter 32 extends from the storage hole 31, as the circular tube 21 and the adjusting tube 22 rotate, the distance between the cutter 32 and the outer wall of the adjusting tube 22 gradually decreases until the cutter 32 and the outer wall of the adjusting tube 22 collide with each other. At this time, the cutter 32 cuts the lithium battery diaphragm by rolling cutting, and the lithium battery diaphragm can be rolled up within a certain length range as needed.

[0026] In a further preferred embodiment of the present invention, Figure 2 , Figure 3 , Figure 4 and Fig. 9 As shown, the adjustment assembly 4 includes a plurality of support plates 41, one end of the support plate 41 is rotatably sleeved on the outer peripheral side of the corresponding inner tube 231 through a bearing, two fixed blocks 42 are relatively fixedly installed in the housing 1 by bolts, a storage groove 43 is opened in the fixed block 42, and the other end of the support plate 41 is inserted into the corresponding storage groove 43, a second piston plate 44 is fixedly installed on the other end of the support plate 41, and the outer peripheral wall of the second piston plate 44 is in contact with the inner wall of the corresponding storage groove 43, an air pump 45 is fixedly installed in the storage groove 43, and the exhaust end of the air pump 45 extends to the outside of the corresponding fixed block 42, two second springs 46 are relatively arranged between the second piston plate 44 and the inner wall of the corresponding storage groove 43, and the two ends of each second spring 46 are respectively fixedly connected to the corresponding second piston plate 44 and the inner wall of the corresponding storage groove 43; In this embodiment, it should be noted that the support plate 41 is in contact with the inner wall of the opening of the corresponding storage slot 43; according to Fig. 9 As shown, during the process of the winding roller 23 winding up the lithium battery diaphragm, the air pump 45 is started at the same time to continuously extract the gas in the storage tank 43, and the negative pressure strength in the storage tank 43 gradually increases, and then the adsorption force of the negative pressure chamber in the storage tank 43 on the second piston plate 44 offsets the thrust of the second spring 46 on the second piston plate 44. Figure 3 and Fig. 9As shown, the second piston plate 44 sliding in the storage tank 43 pulls part of the support plate 41 into the storage tank 43 at a uniform speed, thereby synchronously adjusting the distance between the winding roller 23 and the adjusting tube 22 as the winding amount of the lithium battery diaphragm on the sleeve 232 increases, leaving space for the lithium battery diaphragm to be wound on the sleeve 232, thereby preventing the lithium battery diaphragm on the bottom winding roller 23 from affecting the winding operation of the lithium battery diaphragm by the top winding roller 23.

[0027] In a further preferred embodiment of the present invention, Fig. 9 As shown, a pressure limiting valve 47 is fixedly mounted on one side of the fixed block 42 away from the air pump 45, and the air inlet end of the pressure limiting valve 47 is inserted into the corresponding storage tank 43; In this embodiment, according to Fig. 9 As shown, during the process of the air pump 45 pumping out the gas in the storage tank 43, a pressure difference is simultaneously generated at both ends of the pressure limiting valve 47. At this time, the external gas continues to flow into the storage tank 43 from the pressure limiting valve 47 to replenish a part of the gas lost in the storage tank 43. Figure 4 and Fig. 9 As shown, after the air pump 45 stops running, the second piston plate 44 quickly moves in the opposite direction and resets due to the push of the second spring 46 until the second piston plate 44 and the inner wall of the storage tank 43 collide with each other, and the plurality of inner tubes 231 return to a coaxial state, and the operator does not need to perform other operations.

[0028] In a further preferred embodiment of the present invention, Fig. 9 As shown, a plurality of first limit blocks 48 and a plurality of second limit blocks 49 are fixedly installed at positions corresponding to the second piston plate 44 in the storage groove 43, and the first limit blocks 48 and the second limit blocks 49 are both located between the corresponding two second springs 46, and the second limit block 49 is located between the corresponding two first limit blocks 48, and the length of the second limit block 49 is greater than the length of the first limit block 48; In this embodiment, it should be noted that according to Fig. 9 As shown, the first limit block 48 and the second limit block 49 are both located between the corresponding second piston plate 44, the corresponding air pump 45 and the corresponding pressure limiting valve 47; After completing the cutting operation of the lithium battery separator, according to Fig. 9 As shown, during the process of the support plate 41 being retracted into the storage groove 43, due to the mutual interference between the first limit block 48, the second limit block 49 and the second piston plate 44, the length of the support plate 41 retracted into the storage groove 43 changes accordingly, thereby causing several inner tubes 231 to be automatically misaligned, without the need to set up an additional driving structure, thereby reducing the production cost of the device.

[0029] In a further preferred embodiment of the present invention, Figure 2 , Figure 3 and Fig.10As shown, the driving exhaust assembly 5 includes a protective shell 51, and the two protective shells 51 are relatively fixedly installed on the outer wall of the shell 1 at positions corresponding to the circular tube 21 and the regulating tube 22, and the interiors of the two protective shells 51 are communicated with the interior of the regulating tube 22, and the upper and lower sides of the protective shell 51 are connected and equipped with two soft tubes 52, and the air inlet end of each soft tube 52 is inserted into the corresponding outer tube 233 and rotatably connected to the corresponding outer tube 233, and the two ends of the circular tube 21 rotate through the shell wall of the protective shell 51, and the two ends of the circular tube 21 and the regulating tube 233 are connected. 2 are fixedly sleeved with outer gear rings 53 at both ends, and two adjacent outer gear rings 53 are meshed and connected, the outer gear rings 53 are located in the corresponding protective shell 51, a motor 54 is fixedly installed on the inner side wall of the outer shell 1, a driving gear 55 is fixedly installed on the driving end of the motor 54, and the driving gear 55 is meshed and connected with the corresponding outer gear ring 53, two drivers 56 are oppositely arranged in the outer shell 1, and the shell wall of the driver 56 is fixedly connected to the corresponding support plate 41, and the driving gear ring of the driver 56 is fixedly sleeved on the outer peripheral side of the corresponding outer tube 233; In this embodiment, it should be noted that the driver 56 is mainly an electrically controlled driving device composed of a housing, a driving motor, a plurality of gears and a driving gear ring, and the middle portion of the soft tube 52 is spirally arranged so that the length of the soft tube 52 can be adaptively adjusted according to needs; When using the device, Figure 2 , Figure 3 and Fig.10 As shown, the motor 54 is started to drive the driving gear 55 to rotate at a constant speed, thereby driving the round tube 21 and the adjusting tube 22 to rotate slowly and uniformly toward each other through the outer gear ring 53. Since the diameter of the outer gear ring 53 is larger than the diameter of the driving gear 55, the driving force of the motor 54 on the round tube 21 and the adjusting tube 22 can be enhanced; according to Figure 4 and Figure 5 As shown, when the winding roller 23 is performing the winding operation of the lithium battery diaphragm, the driver 56 drives the winding roller 23 to rotate, and winds the lithium battery diaphragm on the outer peripheral side of the sleeve, and due to the fixation between the driver 56 and the support plate 41, the movement of the winding roller 23 will not affect the driving operation of the driver 56 on the winding roller 23.

[0030] In a further preferred embodiment of the present invention, Figure 2 and Fig.10 As shown, two exhaust pipes 57 are relatively fixedly installed on the side wall of the protective shell 51, and a transmission gear 58 is rotatably installed at the position corresponding to the exhaust pipe 57 on the outer wall of the shell 1, and the transmission gear 58 is meshed and connected with the corresponding outer gear ring 53. An impeller 59 is arranged in the exhaust pipe 57, and the impeller 59 is fixedly connected with the corresponding transmission gear 58, and the impeller 59 is gap-matched with the inner wall of the corresponding exhaust pipe 57; In this embodiment, according to Figure 3, Figure 4 and Fig.10 As shown, while the outer gear ring 53 rotates slowly, it will drive the transmission gear 58 to rotate rapidly, and the rotating transmission gear 58 will synchronously drive the impeller 59 located in the exhaust pipe 57 to rotate rapidly. Figure 2 and Fig.10 As shown, the rotating impeller 59 pushes the gas in the exhaust pipe 57 out of the exhaust pipe 57, so that a negative pressure chamber is continuously formed in the exhaust pipe 57. Due to the pressure difference between the inside of the exhaust pipe 57 and the inside of the protective shell 51, the gas in the protective shell 51 continuously flows into the exhaust pipe 57 to replenish the gas lost in the exhaust pipe 57, and the gas inside the circular tube 21 and the regulating tube 22 also synchronously flows into the protective shell 51 to replenish a part of the gas lost in the protective shell 51. At the same time, the gas in the winding roller 23 also synchronously and continuously flows into the protective shell 51 through the soft tube 52 to replenish another part of the gas lost in the protective shell 51, so that the driving component can synchronously extract the gas in the circular tube 21 and the regulating tube 22 when driving the circular tube 21 to rotate, without the need to set up an additional driving structure, thereby reducing the production cost of the device.

[0031] Working principle: When the improved lithium battery diaphragm cutting and winding equipment is used, the slitting device slits the lithium battery diaphragm into a number of lithium battery diaphragms of equal length, and pushes the slit lithium battery diaphragm into the adjustment mechanism of the slitting device, so that the end of the lithium battery diaphragm after slitting moves from the corresponding position in the outer shell 1 to the top side of the round rod, and at the same time, the motor 54 starts to drive the driving gear 55 to rotate at a uniform speed, thereby driving the circular tube 21 and the regulating tube 22 to rotate slowly and uniformly towards each other through the outer gear ring 53, wherein the outer gear ring 53 will drive the transmission gear 58 to rotate rapidly while rotating slowly, and the rotating transmission gear 58 will synchronously drive the impeller 59 located in the exhaust pipe 57 to rotate rapidly, and the rotating impeller 59 pushes the gas in the exhaust pipe 57 out of the exhaust pipe 57, so that the exhaust pipe 57 is kept in the exhaust pipe 57. A negative pressure chamber is continuously formed. Due to the pressure difference between the inside of the exhaust pipe 57 and the inside of the protective shell 51, the gas in the protective shell 51 continuously flows into the exhaust pipe 57 to replenish the gas lost in the exhaust pipe 57, and the gas inside the circular tube 21 and the regulating tube 22 also synchronously flows into the protective shell 51 to replenish a part of the gas lost in the protective shell 51. At the same time, the gas in the winding roller 23 also synchronously and continuously flows into the protective shell 51 through the soft tube 52 to replenish another part of the gas lost in the protective shell 51, so that a negative pressure chamber is continuously formed inside the circular tube 21, the regulating tube 22 and the winding roller 23. At the same time, the external gas flows into the circular tube 21 and the winding roller 23 from the first adsorption hole 25 and the second adsorption hole 26 to replenish the gas lost in the circular tube 21 and the winding roller 23. During the process of the circular tube 21 and the adjusting tube 22 rotating toward each other, the moving trajectory of the end of the lithium battery diaphragm can be constrained and guided by rotating the circular tube 21, so that the end of the lithium battery diaphragm is directly inserted into the gap between the circular tube 21 and the end of the adjusting tube 22, and then the end of the lithium battery diaphragm is attached to the adjusting tube 22. At this time, due to the blocking of the first adsorption hole 25 by the lithium battery diaphragm, an adsorption force can be applied between the lithium battery diaphragm and the adjusting tube 22, so that the end of the lithium battery diaphragm is attached to the adjusting tube 22. As the adjusting tube 22 rotates, the lithium battery The end of the diaphragm moves in a circle around the adjusting tube 22, and then the end of the lithium battery diaphragm is sent between the adjusting tube 22 and the bottom winding roller 23. At this time, due to the blocking of the second adsorption hole 26 by the lithium battery diaphragm, a stronger adsorption force can be formed between the end of the lithium battery diaphragm and the winding roller 23, so that the end of the lithium battery diaphragm is separated from the adjusting roller. At the same time, the driver 56 on the bottom side drives the winding roller 23 to rotate at a constant speed, and the lithium battery diaphragm is attached to the winding roller 23 and rotates with the winding roller 23, so that the lithium battery diaphragm is wound on the sleeve 232; When the lithium battery diaphragm is rolled up on the sleeve 232, the air pump 45 is started at the same time to continuously extract the gas in the storage tank 43. As the gas in the storage tank 43 is lost, the negative pressure strength in the storage tank 43 is gradually increased, and then the adsorption force of the negative pressure chamber in the storage tank 43 on the second piston plate 44 offsets the thrust of the second spring 46 on the second piston plate 44, so that the support plate 41 is retracted into the storage tank 43 at a uniform speed, so that as the amount of lithium battery diaphragm rolled up on the sleeve 232 increases, the distance between the winding roller 23 and the regulating tube 22 is synchronously adjusted to leave space for the lithium battery diaphragm to be wound on the sleeve 232; It should be noted that when the air pump 45 extracts the gas in the storage tank 43, a pressure difference is simultaneously generated at both ends of the pressure limiting valve 47. At this time, the external gas continues to flow into the storage tank 43 from the pressure limiting valve 47 to replenish a part of the gas lost in the storage tank 43. As the lithium battery diaphragm on the sleeve 232 is rolled up, after the rolling amount of the lithium battery diaphragm on the sleeve 232 reaches a threshold value, the electric control valve 34 is opened, and the liquid supply device injects a corresponding amount of filling liquid into the circular tube 21 from the electric control valve 34. After the filling liquid fills the interior of the circular tube 21, part of the filling liquid in the circular tube 21 flows into the storage hole 31, and applies a driving force to the first piston plate 33, pushing the cutter 32 out of the storage hole 31 until the first piston plate 33 and the inner wall of the storage hole 31 collide with each other. After the cutter 32 extends out of the storage hole 31, as the circular tube 21 and the adjusting tube 22 rotate, the cutter 32 and the adjusting tube 22 are pressed against each other. The distance between the outer walls of the tube 22 gradually decreases until the cutter 32 and the outer wall of the adjusting tube 22 collide with each other. At this time, the cutter 32 cuts the lithium battery diaphragm by rolling cutting. Then, as the round tube 21 rotates, the new end of the lithium battery diaphragm is automatically fed into the gap between the round tube 21 and the adjusting tube 22. Then, according to the above, the end of the lithium battery diaphragm rotates with the rotating adjusting tube 22, and then the end of the lithium battery diaphragm is fed between the adjusting tube 22 and the top winding roller 23. At the same time, the top driver 56 drives the top winding roller 23 to rotate at a constant speed, and the subsequent lithium battery diaphragm is wound on the top sleeve. After the cutter 32 cuts the lithium battery diaphragm, the driver 56 continues to drive the winding roller 23 to rotate one circle and then stops running. As shown above, as the support plate 41 continues to retract into the storage tank 43, the wound lithium battery diaphragm roll can be driven to continue to move so that the automatic adjustment roller of the wound lithium battery diaphragm roll is separated to prevent the wound lithium battery diaphragm from affecting the subsequent winding operation of the lithium battery diaphragm. As the bottom winding roller 23 rotates, the gas on the outer peripheral side of the lithium battery diaphragm roll when the lithium battery diaphragm roll rotates can apply a restraining force to the lithium battery diaphragm roll to prevent the lithium battery roll from spreading, and when the second piston plate 44 and After the first limiting block 48 or the second limiting block 49 contacts each other, the support plate 41 no longer continues to retract into the storage groove 43. At this time, due to the different lengths of the first limiting block 48 and the second limiting block 49, the support plate 41 is retracted into the storage groove 43, and simultaneously drives the plurality of inner tubes 231 to be dislocated. During the dislocation of the plurality of inner tubes 231, due to the mutual contact between the arc surface of the limiting tube 241 and the inner wall of the limiting groove 242, the arc end of the limiting tube 241 can be directly squeezed out of the limiting groove 242 along the arc surface of the limiting tube 241, and the connection state between the plurality of inner tubes 231 is automatically released. After several inner tubes 231 are misaligned, the operator directly pulls the sleeve 232 out of the inner tube 231, and can directly remove the rolled lithium battery diaphragm roll from the device, and puts a new sleeve 232 on the inner tube 231 again, and simultaneously inserts the limit bar 234 into the tube wall of the sleeve 232, and then synchronously completes the second adsorption hole 26 on the inner tube 231 of the sleeve 232, and at this time, due to the mutual interference between the limit bar 234 and the tube wall of the sleeve 232, the sleeve 232 can rotate together with the inner tube 231, and the replacement of the sleeve 232 is completed; After the unloading of the lithium battery diaphragm roll is completed, the air pump 45 stops running. At this time, as shown above, as the external gas continues to flow into the storage tank 43 from the pressure limiting valve 47, the negative pressure intensity in the storage tank 43 decreases rapidly. At this time, due to the push of the second spring 46, the second piston plate 44 quickly moves in the opposite direction and resets until the second piston plate 44 and the inner wall of the storage tank 43 conflict with each other. In the process of releasing the misaligned state of the inner tube 231, due to the mutual conflict between the arc surface of the limiting tube 241 and the outer ring edge of the sleeve 232, the limiting tube 241 can be squeezed into the inner tube 231 along the arc surface of the limiting tube 241, so that the plurality of inner tubes 231 form a coaxial state. At this time, due to the push of the first spring 243 on the limiting tube 241, if there is no misalignment between the limiting tube 241 and the limiting groove 242, Then the first spring 243 pushes the arc-shaped end of the limiting tube 241 to automatically insert into the limiting groove 242, and due to the mutual interference between the outer arc wall of the limiting tube 241 and the inner wall of the limiting groove 242, the connection between the two adjacent inner tubes 231 is completed, and then the driver 56 drives the inner tube 231 to drive the outer tube 233 to rotate intermittently at a high speed. At this time, if the connection between the two inner tubes 231 is not completed, due to the effect of inertia, the arc-shaped end of the limiting tube 241 slides against the side wall of the inner tube 231, and an angular offset occurs between the two inner tubes 231, thereby completing the alignment operation between the arc-shaped end of the limiting tube 241 and the limiting groove 242, and finally completing the alignment operation between the limiting tube 241 and the limiting groove 242 in sequence through multiple reciprocating rotations of the outer tube 233, so that a plurality of inner tubes 231 complete the power connection; After the amount of lithium battery diaphragm wound on the top sleeve 232 reaches the threshold value, the cutting operation of the lithium battery diaphragm is completed by the cutter 32 according to the above, and the end of the lithium battery diaphragm is sent to the gap between the adjusting tube 22 and the bottom winding roller 23 again by the rotation of the adjusting tube 22, and the above lithium battery diaphragm winding operation is performed. At the same time, according to the above, as the top part support plate 41 is retracted into the storage tank 43, the top winding roller 23 can be split, so that the operator can directly take off the lithium battery diaphragm roll, and then the top air pump 45 stops running, and the assembly of the top winding roller 23 is completed, and the winding operation of the lithium battery diaphragm can be continuously performed in this way; It should be noted that the operation of the above-mentioned device can be controlled by connecting an external control host to the outside of the device, so that the operating status of the device can be controlled by the control host.

[0032] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A lithium battery separator cutting and winding device, comprising a housing (1), characterized in that: Also includes: A winding assembly (2), wherein the winding assembly (2) is arranged in an outer shell (1), the winding assembly (2) mainly consists of a round tube (21), an adjusting tube (22) and two winding rollers (23), and the round tube (21) and the adjusting tube (22) are relatively rotatably mounted in the outer shell (1), the two winding rollers (23) are relatively arranged at the upper and lower sides of the adjusting tube (22), the winding rollers (23) mainly consist of a plurality of inner tubes (231), a plurality of sleeves (232) and two outer tubes (233), the two outer tubes (233) are relatively arranged, and if The inner tube (231) is arranged between two corresponding outer tubes (233); the outer tube (233) is fixedly connected to the corresponding inner tube (231); and the two adjacent inner tubes (231) are connected via a connecting mechanism (24); the sleeve (232) is slidably sleeved on the outer circumference of the corresponding inner tube (231); a plurality of second adsorption holes (26) are provided in a circumferential array on the tube wall of the sleeve (232) and the tube wall of the inner tube (231); and a plurality of first adsorption holes (25) are provided in a circumferential array on the outer circumferential wall of the circular tube (21); Two adjustment components (4), the two adjustment components (4) being arranged on upper and lower sides of the two winding rollers (23) in a relative manner, and the adjustment components (4) adjusting the vertical position of the inner tube (231); A cutting assembly (3), wherein the cutting assembly (3) is arranged on the circular tube (21), and the cutting assembly (3) is used to cut the lithium battery diaphragm; Two driven air extraction components (5), the driven air extraction components (5) being arranged on the outer peripheral sides of the two winding rollers (23), and the driven air extraction components (5) driving the circular tube (21), the regulating tube (22) and the two winding rollers (23) to rotate, and continuously extracting gas from the circular tube (21), the regulating tube (22) and the two winding rollers (23).

2. A lithium battery separator cutting and winding device according to claim 1, characterized in that: The outer circumferential wall of the circular tube (21) is gap-matched with the outer circumferential wall of the regulating tube (22); a plurality of limit strips (234) are fixedly mounted in a circular array on the outer circumferential wall of the inner tube (231); and each limit strip (234) is slidably inserted into the tube wall of the corresponding sleeve (232).

3. A lithium battery separator cutting and winding device according to claim 2, characterized in that: A guide groove (27) is provided on the outer wall of the housing (1) at a position corresponding to the outer tube (233), and the outer tube (233) passes through the corresponding guide groove (27) and contacts the inner wall of the corresponding guide groove (27).

4. A lithium battery separator cutting and winding device according to claim 3, characterized in that: The connecting mechanism (24) comprises a limiting tube (241), one end of which is in the shape of a square tube, and the outer ring edge of which is in the shape of an arc surface, and the other end of which is in the shape of a round tube (21). The limiting tube (241) is slidably mounted in an opening at one end of a corresponding inner tube (231), and a limiting groove (242) is provided on the other side of the inner tube (231), and the arc surface end of the limiting tube (241) is inserted into the corresponding limiting groove (242) and contacts the inner wall of the corresponding limiting groove (242). A first spring (243) is provided between the limiting tube (241) and the inner wall of the corresponding inner tube (231), and the two ends of the first spring (243) are respectively in contact with the inner wall of the corresponding inner tube (231) and the corresponding limiting tube (241).

5. A lithium battery separator cutting and winding device according to claim 4, characterized in that: The cutting assembly (3) comprises a cutter (32); a storage hole (31) is provided on the outer peripheral wall of the circular tube (21); the interior of the storage hole (31) is communicated with the interior of the circular tube (21); the cutter (32) is slidably mounted in the storage hole (31); a first piston plate (33) is fixedly mounted on the back end of the cutter (32); the outer peripheral wall of the first piston plate (33) is in contact with the inner wall of the storage hole (31); and an electric control valve (34) is rotatably mounted on the open end of the circular tube (21).

6. A lithium battery separator cutting and winding device according to claim 5, characterized in that: The regulating assembly (4) comprises a plurality of support plates (41), one end of the support plate (41) being rotatably sleeved on the outer circumference of the corresponding inner tube (231) via a bearing, two fixed blocks (42) being relatively fixedly mounted in the housing (1) via bolts, a storage groove (43) being provided in the fixed block (42), and the other end of the support plate (41) being inserted into the corresponding storage groove (43), a second piston plate (44) being fixedly mounted on the other end of the support plate (41), and the outer circumferential wall of the second piston plate (44) being in contact with the inner wall of the corresponding storage groove (43), an air pump (45) being fixedly mounted in the storage groove (43), and an exhaust end of the air pump (45) extending to the outside of the corresponding fixed block (42), two second springs (46) being relatively mounted between the second piston plate (44) and the inner wall of the corresponding storage groove (43), and the two ends of each second spring (46) being respectively fixedly connected to the corresponding second piston plate (44) and the inner wall of the corresponding storage groove (43).

7. A lithium battery separator cutting and winding device according to claim 6, characterized in that: A pressure limiting valve (47) is fixedly mounted on a side of the fixed block (42) away from the air pump (45), and an air inlet end of the pressure limiting valve (47) is inserted into the corresponding storage tank (43).

8. The lithium battery separator cutting and winding device according to claim 7, characterized in that: A plurality of first limit blocks (48) and a plurality of second limit blocks (49) are fixedly installed at positions corresponding to the second piston plate (44) in the storage groove (43), and the first limit blocks (48) and the second limit blocks (49) are both located between the corresponding two second springs (46), and the second limit block (49) is located between the corresponding two first limit blocks (48), and the length of the second limit block (49) is greater than the length of the first limit block (48).

9. A lithium battery separator cutting and winding device according to claim 8, characterized in that: The driving air extraction component (5) comprises a protective shell (51), wherein the two protective shells (51) are relatively fixedly mounted on the outer wall of the outer shell (1) at positions corresponding to the circular tube (21) and the regulating tube (22), and the interiors of the two protective shells (51) are communicated with the interior of the regulating tube (22), and two soft tubes (52) are connected and mounted on the upper and lower sides of the protective shell (51), and the air inlet end of each soft tube (52) is inserted into the corresponding outer tube (233) and is rotatably connected to the corresponding outer tube (233), and the two ends of the circular tube (21) are rotatably penetrated through the shell wall of the protective shell (51), and the two ends of the circular tube (21) and the regulating tube (22) are connected. ) are fixedly sleeved with outer toothed rings (53) at both ends, and two adjacent outer toothed rings (53) are meshingly connected, the outer toothed rings (53) are located in the corresponding protective shell (51), a motor (54) is fixedly mounted on the inner side wall of the outer shell (1), a driving gear (55) is fixedly mounted on the driving end of the motor (54), and the driving gear (55) is meshingly connected with the corresponding outer toothed rings (53), two drivers (56) are arranged opposite to each other in the outer shell (1), and the shell wall of the driver (56) is fixedly connected to the corresponding support plate (41), and the driving toothed ring of the driver (56) is fixedly sleeved on the outer peripheral side of the corresponding outer tube (233).

10. A lithium battery separator cutting and winding device according to claim 9, characterized in that: Two exhaust pipes (57) are relatively fixedly installed on the side wall of the protective shell (51) and penetrate through it. A transmission gear (58) is rotatably installed on the outer wall of the outer shell (1) at a position corresponding to the exhaust pipe (57), and the transmission gear (58) is meshingly connected with the corresponding outer gear ring (53). An impeller (59) is provided in the exhaust pipe (57), and the impeller (59) is fixedly connected with the corresponding transmission gear (58). The impeller (59) is clearance-matched with the inner wall of the corresponding exhaust pipe (57).

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