Transmission device capable of rapidly switching conveying length for needling machine

Abstract

The invention relates to the technical field of needling machines, in particular to a transmission device capable of rapidly switching conveying length for a needling machine, which comprises a transverse plate, a vertical plate is fixedly and vertically arranged at the end part of the transverse plate, a driving belt wheel and a driven belt wheel are rotatably arranged on the side surface, far away from the transverse plate, of the vertical plate, and one ends, far away from the vertical plate, of the driving belt wheel and the driven belt wheel are rotatably connected to a vertical plate II; a conveyor belt is sleeved between the driving belt wheel and the driven belt wheel; a plurality of convex teeth are uniformly distributed on the outer side of the conveyor belt; tensioning assemblies used for tensioning the conveying belt are arranged on the side faces, close to each other, of the vertical plate and the second vertical plate, and a lever mechanism is arranged between the driving belt wheel and the driven belt wheel. Through the arrangement of the lever mechanism, the conveying belt can intermittently convey the fiber web, through the arrangement of the switching assembly, the conveying length of the fiber web can be automatically controlled to be changed through the conveying belt, and convenience, rapidness and high efficiency are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of needle punching machines, and specifically relates to a transmission device for quickly switching the conveying length of a needle punching machine. Background Art

[0002] Needle-punched non-woven fabric is one of the main production processes of non-woven fabrics, and its main processing equipment is a needle punching machine. The existing needle punching machines mainly include a feeding curtain, a supporting net plate, a stripping net plate, a main transmission shaft, a needle plate and an output roller. The fiber web is fed between the supporting net plate and the stripping net plate through the feeding curtain. The needle plate realizes reciprocating up and down movement through the main transmission shaft, so as to drive the barbs on the needle plate to move up and down. When the barbs pierce downward into the fiber web, the fiber web closely adheres to the supporting net plate. When the barbs withdraw upward from the fiber web, the friction between the fiber web and the barbs causes the fiber web and the barbs to move upward together, and the fiber web closely adheres to the stripping net plate. After the fiber web is needle-punched, a needle-punched felt with a certain strength, density and thickness is formed and output by the output roller.

[0003] Since the process of the barbs of the needle punching machine piercing the fiber web is an intermittent movement in the vertical direction, while the process of the feeding curtain and the output roller transporting the fiber web is a continuous movement in the horizontal direction. In this way, after the barbs penetrate into the fiber web, the fiber web still moves in the horizontal direction, resulting in the phenomenon of enlarged needle holes and broken needles during the needle punching process.

[0004] In the prior art, the above phenomenon is usually solved by using a servo motor or a stepping motor to achieve intermittent movement, but it will cause frequent start-up and speed change of the motor, resulting in damage to the motor and short service life. Secondly, a cam mechanism is used to drive a contact switch, but when adjusting the conveying speed, the installation position of the cam needs to be adjusted, resulting in complicated adjustment and insufficient accuracy.

[0005] Therefore, a transmission device for quickly switching the conveying length of a needle punching machine is needed to solve the above technical problems. Summary of the Invention

[0006] The purpose of the present invention is to solve the above problems. A transmission device for quickly switching the conveying length of a needle punching machine can realize automatic and quick switching of the conveying length.

[0007] A transmission device for quickly switching the conveying length of a needle punching machine is provided, which includes a horizontal plate. A vertical plate is fixedly arranged vertically at the end of the horizontal plate. A driving pulley and a driven pulley are rotatably arranged on the side of the vertical plate away from the horizontal plate. One ends of the driving pulley and the driven pulley away from the vertical plate are rotatably connected to a second vertical plate. Two parallel support plates are arranged between the second vertical plate and the horizontal plate; A conveyor belt is sleeved between the driving pulley and the driven pulley, and a plurality of convex teeth are evenly distributed on the outer side of the conveyor belt; The driving pulley is rotationally connected to the second vertical plate through a waist-shaped bearing seat 1, and both ends of the driven pulley are rotatably arranged on the vertical plate and the second vertical plate respectively through waist-shaped bearing seats 2. The conveyor belt is sleeved in the grooves on the outer sides of the driving pulley and the driven pulley; Tensioning components for tensioning the conveyor belt are arranged on the side surfaces of the vertical plate and the second vertical plate close to each other, and a lever mechanism is arranged between the driving pulley and the driven pulley.

[0008] Furthermore, the lever mechanism includes a sliding plate vertically slidably arranged on the vertical plate. The sliding plate and the vertical plate are connected by two crossed roller guide rail assemblies 2. A plurality of elliptical bearing seats are horizontally arranged on the upper side surface of the sliding plate. A pressing wheel is rotatably connected in each elliptical bearing seat. The adjacent pressing wheels are arranged at intervals and are parallel to each other. The outer side of each pressing wheel is in contact with the inner side surface of the conveyor belt; The tensioning wheels are arranged in three.

[0009] Furthermore, a driving plate penetrating the vertical plate is arranged at the edge of the sliding plate far from the pressing wheel. A notch for driving the plate to move is arranged on the vertical plate. The side surface of the driving plate far from the pressing wheel abuts against the lever. The lever is rotatably connected to the lever seat. The lever seat is fixedly connected to the surface of the cross plate. The other end of the lever abuts against the cam group. The cam group is arranged on the switching component for controlling the moving position of the cam group.

[0010] Furthermore, a small runner is rotatably arranged at both ends of the lever. The two small runners respectively abut against the cam group and the driving plate.

[0011] Furthermore, the tensioning component includes a crossed roller guide rail assembly 1. The crossed roller guide rail assembly 1 includes a guide rail fixedly arranged on the side surfaces of the vertical plate and the second vertical plate close to each other and a sliding seat slidably connected to the guide rail. A plate seat is bolted to the sliding seat. A tensioning wheel is rotatably arranged on the side surface of the plate seat far from the sliding seat. A groove 3 is arranged on the tensioning wheel. The inner side surface of the conveyor belt abuts in the groove 3; The upper end of the plate seat abuts against two tensioning springs. The other ends of the two tensioning springs are respectively sleeved on the outer sides of the two fixing rods of the spring baffle. The spring baffle is bolted to the side surface of the vertical plate.

[0012] Furthermore, the crossed roller guide rail assembly 2 includes a left slide rail and a right slide rail that slide relative to each other. The left slide rail is bolted to the sliding plate, and the right slide rail is bolted to the vertical plate or the second vertical plate. The crossed roller guide rail assembly 2 is vertically arranged on the left and right sides of the sliding plate.

[0013] Furthermore, the cam group includes a cam 1, a cam 2, a cam 3, and a cam 4 fixedly arranged side by side in sequence. The cam 1, the cam 2, the cam 3, and the cam 4 are fixedly sleeved on the outer side of the spline sleeve; The first cam, the second cam, the third cam, and the fourth cam respectively include a first lift stop section, a second lift stop section, a third lift stop section, and a fourth lift stop section, and the phase angles corresponding to the first lift stop section, the second lift stop section, the third lift stop section, and the fourth lift stop section increase in sequence.

[0014] Further, the switching component includes a servo motor fixedly connected to the side surface of the cross plate. A cylindrical cam is fixedly sleeved outside the output shaft of the servo motor. A driving sleeve is movably sleeved outside the cylindrical cam. The driving sleeve slidably penetrates through a guiding sleeve. The guiding sleeve is bolted to the side surface of the cross plate. One end of the driving sleeve away from the cylindrical cam abuts against a second thrust bearing. The second thrust bearing is slidably sleeved on a spline shaft. A spline sleeve of the cam group is slidably sleeved outside the spline shaft. The other end of the cam group abuts against a first thrust bearing. The other end of the first thrust bearing abuts against a thrust spring. The other end of the thrust spring abuts against a spring retaining disc. The spring retaining disc abuts against the shoulder of the spline shaft. The cylindrical outer surface of the cylindrical cam is provided with a cam groove. The cam groove includes a first stop platform, a second stop platform, a third stop platform, a fourth stop platform, and a return groove connected in sequence. The axial distances between the first stop platform, the second stop platform, the third stop platform, and the fourth stop platform along the cylindrical cam are the same. The driving sleeve includes an adjacent rectangular sleeve and circular sleeve. Both the rectangular sleeve and the circular sleeve are provided with cylindrical hollow cavities. The rectangular sleeve slidably penetrates through the guiding sleeve. The circular sleeve is slidably sleeved outside the cylindrical cam. A sliding column is provided on the inner surface of the hollow cavity of the circular sleeve. The sliding column slides in the cam groove of the cylindrical cam.

[0015] Further, the spline shaft penetrates through a first bearing seat. One end of the spline shaft away from the servo motor is rotatably arranged in the vertical plate. A driven gear is sleeved on the spline shaft between the first bearing seat and the vertical plate. A first positioning bushing is arranged between the driven gear and the vertical plate.

[0016] Further, the driven gear is meshed and connected with a driving gear. The driving gear is fixedly sleeved on a driving shaft. A second bearing seat is sleeved outside the driving shaft. A power input gear is fixedly sleeved at one end of the driving shaft close to the bearing seat. One end of the driving shaft away from the power input gear rotates through the vertical plate and is fixedly inserted into a driving pulley. The driving gear is arranged between the second bearing seat and the vertical plate. A second positioning bushing is arranged between the driving gear and the vertical plate. A third positioning bushing is arranged between the vertical plate and the driving pulley.

[0017] The beneficial effects of the present invention: Through the setting of the lever mechanism, the conveyor belt can intermittently transfer the fiber web. Through the setting of the switching component, the change of the transfer length of the conveyor belt to the fiber web can be automatically controlled, which is convenient, fast, and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the following detailed description of the preferred embodiments. The drawings are for the purpose of illustrating the preferred embodiments only and are not to be considered as limiting the present invention.

[0019] Figure 1 Schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 Schematic diagram of the overall three-dimensional upward view structure of the present invention; Figure 3 For the present invention Figure 1 Schematic diagram of the structure at position A in; Figure 4 Schematic diagram of the structure of the present invention after removing the conveyor belt; Figure 5 Schematic diagram of the structure of the cross-roller guide assembly two of the present invention; Figure 6 Schematic diagram of another perspective structure of the present invention after removing the conveyor belt; Figure 7 For the present invention Figure 6 Schematic diagram of the structure at position C in; Figure 8 Schematic diagram of the structure of the cross-roller guide assembly one of the present invention; Figure 9 Schematic diagram of the structure of the lever mechanism of the present invention; Figure 10 For the present invention Figure 9 Schematic diagram of the structure at position E in; Figure 11 Schematic diagram of the structure of the cam group of the present invention; Figure 12 Schematic diagram of the partial fracture structure in the exploded state of the cam group of the present invention Figure 13 Schematic diagram of the partial fracture structure in the exploded state of the driving gear and the driven gear of the present invention; Figure 14 Schematic diagram of the cylindrical cam structure of the present invention; Figure 15 Another schematic diagram of the cylindrical cam of the present invention; Figure 16 Schematic diagram of the driving sleeve structure of the present invention; Reference numerals: 1 horizontal plate, 11 vertical plates, 111 second vertical plate, 112 support plate, 12 driving pulley, 121 first waist-shaped bearing seat, 13 driven pulley, 131 second waist-shaped bearing seat, 14 conveyor belt, 141 convex teeth; 2 tensioning assemblies, 21 tensioning wheels, 211 third groove, 22 first cross-roller guide assembly, 221 guide rail, 222 sliding seat, 23 plate seat, 24 spring baffle, 241 fixing rod, 25 tensioning spring; 3 Lever mechanism, 31 Crossed roller guide assembly II, 311 Left slide rail, 312 Right slide rail, 32 Slide plate, 321 Elliptical bearing block, 322 Driving plate, 33 Extrusion wheel, 34 Lever, 341 Small rotating wheel, 35 Lever seat, 36 Cam group, 361 Cam I, 3611 Pushing stroke stop section I, 362 Cam II, 3621 Pushing stroke stop section II, 363 Cam III, 3631 Pushing stroke stop section III, 364 Cam IV, 3641 Pushing stroke stop section IV, 365 Spline sleeve; 4 Switching assembly, 41 Servo motor, 42 Cylindrical cam, 421 First stop platform, 422 Second stop platform, 423 Third stop platform, 424 Fourth stop platform, 425 Return stroke groove; 43 Driving sleeve, 431 Guide sleeve, 432 Slide post, 433 Rectangular sleeve, 434 Circular sleeve; 44 Spline shaft, 441 Thrust bearing I, 442 Thrust spring, 443 Driven gear, 444 Thrust bearing II, 445 Positioning sleeve I, 446 Spring retaining disc, 45 Bearing block I, 46 Power input gear, 47 Driving shaft, 471 Bearing block II, 48 Driving gear, 49 Positioning sleeve II, 491 Positioning sleeve III. Detailed implementation mode

[0020] The present invention will be specifically described below with reference to the accompanying drawings. As Figures 1 - 16 shown, a transmission device for quickly switching the conveying length of a needle punching machine includes a horizontal plate 1. A vertical plate 11 is fixedly and vertically arranged at the end of the horizontal plate 1. A driving pulley 12 and a driven pulley 13 are rotatably arranged on the side of the vertical plate 11 away from the horizontal plate 1. One ends of the driving pulley 12 and the driven pulley 13 away from the vertical plate 11 are rotatably connected to a second vertical plate 111. Two parallel support plates 112 are arranged between the second vertical plate 111 and the horizontal plate 1. The support plates 112 play a role of support and guidance during operation. The fiber web moves on the support plates 112, and the other side of the fiber web cooperates with rollers or conveying plates to realize the conveying of the fiber web.

[0021] A conveyor belt 14 is sleeved between the driving pulley 12 and the driven pulley 13. A plurality of convex teeth 141 are evenly distributed on the outer side of the conveyor belt 14. The convex teeth 141 are used to drive the fiber web to convey forward, improve the friction between the conveyor belt 14 and the fiber web, and improve the accuracy of the conveying distance of the fiber web.

[0022] The driving pulley 12 is rotatably connected to the second vertical plate 111 through a waist-shaped bearing block I 121. Both ends of the driven pulley 13 are respectively rotatably arranged on the vertical plate 11 and the second vertical plate 111 through waist-shaped bearing blocks II 131. The conveyor belt 14 is sleeved in the grooves on the outer sides of the driving pulley 12 and the driven pulley 13. Through the settings of the waist-shaped bearing block I 121 and the waist-shaped bearing block II 131, it is convenient for the driving pulley 12 and the driven pulley 13 to rotate at high speed and stably.

[0023] On the sides of the vertical plate 11 and the second vertical plate 111 that are close to each other, tensioning components 2 for tensioning the conveyor belt 14 are provided. A lever mechanism 3 is arranged between the driving pulley 12 and the driven pulley 13. The lever mechanism 3 includes a sliding plate 32 vertically arranged on the vertical plate 11. The sliding plate 32 and the vertical plate 11 are connected by two crossed roller guide assemblies 31. Horizontally arranged on the upper side of the sliding plate 32 are a plurality of elliptical bearing seats 321. A pressing wheel 33 is rotatably connected in each elliptical bearing seat 321. The adjacent pressing wheels 33 are arranged at intervals and are parallel to each other. The outer side of each pressing wheel 33 is in contact with the inner side of the conveyor belt 14. By driving the sliding plate 32 to move upward through the lever mechanism 3, the sliding plate 32 drives the pressing wheels 33 in the elliptical bearing seats 321 to move upward. The pressing wheels 33 press the conveyor belt 14 and drive the conveyor belt 14 to move upward. When the conveyor belt 14 moves upward, it contacts the fiber web, and thus can drive the fiber web to be conveyed forward. When the sliding plate 32 drives the pressing wheels 33 to move downward, the pressing wheels 33 no longer press the conveyor belt 14. At this time, the conveyor belt 14 no longer contacts the fiber web, and the fiber web is no longer conveyed forward. By intermittently pressing the conveyor belt 14 with the pressing wheels 33, the intermittent conveying of the fiber web is completed.

[0024] Further, referring to Figure 4 , three tensioning wheels 21 are provided. The number of tensioning wheels 21 can also be set as required to achieve the stable conveying of the fiber web.

[0025] Further, referring to Figure 9 , a driving plate 322 penetrating the vertical plate 11 is arranged at the edge of the sliding plate 32 away from the pressing wheels 33. A notch for driving the movement of the driving plate 322 is arranged on the vertical plate 11. The side of the driving plate 322 away from the pressing wheels 33 abuts against the lever 34. The lever 34 is rotatably connected to the lever seat 35. The lever seat 35 is fixedly connected to the surface of the cross plate 1. The other end of the lever 34 abuts against the cam group 36. The cam group 36 is arranged on the switching component 4 for controlling the moving position of the cam group 36. By the switching component 4, the axial movement of the cam group 36 is realized, so that different cams in the cam group 36 contact the lever 34. Different cams drive the lever 34 to flip. The other end of the lever 34 drives the extrusion driving plate 322 when flipping. The driving plate 322 drives the sliding plate 32 and the pressing wheels 33 to press the conveyor belt 14. Since different cams make the pressing wheels 33 press the conveyor belt 14 for different times when contacting the fiber web, when the conveyor belt 14 rotates at a constant speed, the conveyor belt 14 contacts the fiber web for different times, and thus the conveying distance of the fiber web is different, so as to realize the adjustment of the conveying distance of the fiber web.

[0026] Further, referring to Figure 10A small rotating wheel 341 is rotatably set at both ends of the lever 34, and the two small rotating wheels 341 are respectively abutted against the cam group 36 and the driving plate 322. Through the setting of the small rotating wheels 341, the sliding friction between the lever 34 and the cam group 36 and the driving plate 322 is converted into rolling friction, thereby reducing friction and improving service life.

[0027] For further information, see Figures 6 - 8 The tensioning assembly 2 includes a cross roller guide rail assembly 1 22, which includes a guide rail 221 fixedly arranged on the side of the vertical plate 11 and the second vertical plate 111 close to each other and a slide 222 slidably connected to the guide rail 221, a plate seat 23 is bolted to the slide 222, and the plate seat 23 is rotatably arranged on the side away from the slide 222. The tensioning wheel 21 is provided with a groove 3 211, and the inner side surface of the conveyor belt 14 abuts against the groove 3 211; The upper end of the plate seat 23 abuts against two tension springs 25, and the other ends of the two tension springs 25 are respectively sleeved on the outside of the two fixing rods 241 of the spring baffle 24, and the spring baffle 24 is bolted to the side of the vertical plate 11. Through the setting of the tension spring 25, the tension spring 25 squeezes the plate seat 23 and the tension wheel 21 on the plate seat 23 to move downward, and the two grooves 211 of the tension wheel 21 squeeze the inner side of the conveyor belt 14 to achieve the tension of the conveyor belt 14, which can keep the conveyor belt 14 tensioned while providing a moving space for the conveyor belt 14, so that the conveyor belt 14 is in contact with the fiber web under the action of the squeezing wheel 33.

[0028] For further information, see Figure 5 The cross roller guide rail assembly 2 31 includes a left slide rail 311 and a right slide rail 312 which are arranged to slide relative to each other. The left slide rail 311 is bolted to the slide plate 32, and the right slide rail 312 is bolted to the vertical plate 11 or the second vertical plate 111. The cross roller guide rail assembly 2 31 is vertically arranged on the left and right sides of the slide plate 32, which can improve the sliding stability of the slide plate 32.

[0029] For further information, see Figure 11 The cam group 36 includes a cam 1 361, a cam 2 362, a cam 3 363 and a cam 4 364 which are fixedly arranged in parallel in sequence. The cam 1 361, the cam 2 362, the cam 3 363 and the cam 4 364 are fixedly sleeved on the outer side of the spline sleeve 365. The cam 1 361, the cam 2 362, the cam 3 363 and the cam 4 364 all include a push section, a push stop section, a return section and a return stop section, and the lift distances corresponding to the push sections are the same, the phase angles corresponding to the return stop sections are the same, and the starting positions corresponding to the cam 1 361, the cam 2 362, the cam 3 363 and the cam 4 364 are set to the same, that is, the zero-degree position of the phase angle is set to coincide.

[0030] The first cam 361, the second cam 362, the third cam 363 and the fourth cam 364 respectively include a first lift stop section 3611, a second lift stop section 3621, a third lift stop section 3631 and a fourth lift stop section 3641, and the phase angles corresponding to the first lift stop section 3611, the second lift stop section 3621, the third lift stop section 3631 and the fourth lift stop section 3641 increase in sequence. Due to the differences in the phase angles of the first lift stop section 3611, the second lift stop section 3621, the third lift stop section 3631 and the fourth lift stop section 3641, the times when the first cam 361, the second cam 362, the third cam 363 and the fourth cam 364 squeeze the lever 34 are different, so that the times when the lever 34 drives the pressing wheel 33 to be in pressing contact with the conveyor belt 14 are different, that is, the contact times between the conveyor belt 14 and the fiber web are different, thereby realizing the change of the conveying distance of the conveyor belt to the fiber web. The number of cams of the cam group 36 can be set more according to needs, so as to facilitate more-level adjustment and realize multi-level adjustment of the conveying distance.

[0031] Further, referring to Figures 12 - 16 , the switching component 4 includes a servo motor 41 fixedly connected to the side surface of the cross plate 1. A cylindrical cam 42 is fixedly sleeved outside the output shaft of the servo motor 41. A driving sleeve 43 is movably sleeved outside the cylindrical cam 42. The driving sleeve 43 is slidably inserted into a guide sleeve 431. The guide sleeve 431 is bolted to the side surface of the cross plate 1. The guide sleeve 431 guides and positions the driving sleeve 43, so that the driving sleeve 43 can only slide within the guide sleeve 431. One end of the driving sleeve 43 away from the cylindrical cam 42 abuts against a second thrust bearing 444. The second thrust bearing 444 is slidably sleeved on a spline shaft 44. A spline sleeve 365 of the cam group 36 is slidably sleeved outside the spline shaft 44. The other end of the cam group 36 abuts against a first thrust bearing 441. The other end of the first thrust bearing 441 abuts against a thrust spring 442. The other end of the thrust spring 442 abuts against a spring retaining disc 446. The spring retaining disc 446 abuts against the shoulder of the spline shaft 44; Referring to Figure 14 and Figure 15 , a cam groove is provided on the cylindrical outer surface of the cylindrical cam 42. The cam groove includes a first stop platform 421, a second stop platform 422, a third stop platform 423, a fourth stop platform 424 and a return groove 425 that are connected in sequence. The first stop platform 421, the second stop platform 422, the third stop platform 423 and the fourth stop platform 424 are connected by transition inclined grooves. The axial distances between the first stop platform 421, the second stop platform 422, the third stop platform 423 and the fourth stop platform 424 along the cylindrical cam 42 are the same; The driving sleeve 43 includes a rectangular sleeve 433 and a circular sleeve 434 which are arranged adjacent to each other. Both the rectangular sleeve 433 and the circular sleeve 434 are provided with cylindrical hollow cavities. The rectangular sleeve 433 is slidably inserted into the guiding sleeve 431. Through the sliding connection between the rectangular sleeve 433 and the guiding sleeve 431, the rotation of the driving sleeve 43 can be restricted, so that the driving sleeve 43 can only slide axially within the guiding sleeve 431. The hollow cavity of the rectangular sleeve 433 is used to accommodate the spline shaft 44. The circular sleeve 434 is slidably sleeved on the outer side of the cylindrical cam 42. A sliding column 432 is provided on the inner surface of the hollow cavity of the circular sleeve 434. The sliding column 432 slides within the cam groove of the cylindrical cam 42. Through the rotation of the cylindrical cam 42, the sliding column 432 slides within the cam groove, and the cam groove pushes the sliding column 432 and the driving sleeve 43 to move axially. The driving sleeve 43 presses the second thrust bearing 444 and the cam group 36, realizing the movement of the cam group 36 on the spline shaft 44. When the cam group 36 moves, different cams of the cam group 36 abut against the lever 34, realizing the driving of the lever 34 by different cams, thereby realizing the adjustment of the conveying distance.

[0032] The servo motor 41 can control the rotation angle of the cylindrical cam 42, and at the same time, the position of the cylindrical cam 42 is fixed through the locking device of the servo motor 41 to prevent the cylindrical cam 42 from rotating. A position sensor can be provided on the spline shaft 44. After the spline shaft 44 rotates in place, that is, when the return stop section of the cam of the cam group 36 sleeved on the spline shaft 44 abuts against the lever 34, in the state where the spline shaft 44 stops rotating, the servo motor 41 drives the cylindrical cam 42 to rotate, realizing the position movement of the cam group 36. Structures such as the position sensor and the controller belong to the prior art and will not be elaborated here.

[0033] Further, referring to Figure 12 and Figure 13 , the spline shaft 44 is inserted into the first bearing seat 45. One end of the spline shaft 44 away from the servo motor 41 is rotatably arranged within the vertical plate 11. A ball bearing is provided between the spline shaft 44 and the vertical plate 11. A driven gear 443 is sleeved on the spline shaft 44 between the first bearing seat 45 and the vertical plate 11. The driven gear 443 and the spline shaft 44 are connected by a key. A first positioning shaft sleeve 445 is provided between the driven gear 443 and the vertical plate 11; the axial position of the spline shaft 44 is fixed through the cooperation of the shoulder of the first bearing seat 45 and the vertical plate 11, and the relative positioning between the driven gear 443 and the spline shaft 44 is realized through the first positioning shaft sleeve 445 and the shoulder.

[0034] Further, the driven gear 443 is meshed and connected to the driving gear 48. The driving gear 48 is fixedly sleeved on the driving shaft 47. A second bearing housing 471 is sleeved outside the driving shaft 47. A power input gear 46 is fixedly sleeved at one end of the driving shaft 47 close to the second bearing housing 471. One end of the driving shaft 47 away from the power input gear 46 rotates through the vertical plate 11 and is fixedly inserted into the driving pulley 12. The power input gear 46 is meshed and connected to other power gears, such as meshing with the power device of the needle. The power input gear 46 can also be directly replaced by a motor to realize the rotation of the driving shaft 47, which needs to be determined according to the actual use situation.

[0035] The driving gear 48 is arranged between the second bearing housing 471 and the vertical plate 11. A second positioning bushing 49 is arranged between the driving gear 48 and the vertical plate 11. A third positioning bushing 491 is arranged between the vertical plate 11 and the driving pulley 12. The second positioning bushing 49 and the third positioning bushing 491 abut against the side of the ball bearing in the vertical plate 11. The axial fixation of the driving shaft 47 is realized through the second bearing housing 471 and the vertical plate 11. The axial fixation of the driving gear 48 and the driving pulley 12 on the driving shaft 47 is realized through the second positioning bushing 49 and the third positioning bushing 491.

[0036] Working principle: Power is transmitted from the power input gear 46 to the driving shaft 47. The driving shaft 47 drives the driving pulley 12 to rotate. The driving pulley 12 drives the conveyor belt 14 to rotate continuously. When the pressing wheel 33 does not press the conveyor belt 14, the conveyor belt 14 does not contact the fiber web and does not drive the fiber web to move.

[0037] The driving shaft 47 drives the driven gear 443 to rotate through the driving gear 48. The driven gear 443 drives the spline shaft 44 to rotate. The spline shaft 44 drives the cam group 36 to rotate. The cams on the cam group 36 press the lever 34. The lever 34 flips. The other end of the lever 34 presses the driving plate 322. The driving plate 322 drives the sliding plate 32 and the pressing wheel 33 to move towards the conveyor belt 14. The pressing wheel 33 pushes the conveyor belt 14 towards the fiber web and presses it tightly against the fiber web. During this process, the conveyor belt 14 drives the fiber web to be conveyed forward; When the return stop section of the cam on the cam group 36 contacts the lever 34 and the cam no longer presses the lever 34, the sliding plate 32 and the pressing wheel 33 return to their original positions and no longer press the conveyor belt 14. At this time, the conveyor belt 14 no longer contacts the fiber web and stops conveying the fiber web. That is, when the cam rotates one circle, the conveyor belt 14 contacts the fiber web once and conveys the fiber web once, thus realizing the intermittent conveying of the fiber web and meeting the conveying requirements of the needle punching machine.

[0038] When the conveying length needs to be adjusted, the power input gear 46 stops rotating. At this time, the spline shaft 44 is also in a fixed rotation state. The spline shaft 44 can be stopped at a specific position through the position sensor, so that the return stop section of the cam on the cam group 36 abuts against the lever 34. At this time, the servo motor 41 drives the cylindrical cam 42 to rotate. The cam groove of the cylindrical cam 42 drives the slide column 432 and the drive sleeve 43 to move axially. The drive sleeve 43 pushes the cam group 36 to move on the spline shaft 44, and cooperates with the thrust spring 442 to enable the cam group 36 to be axially positioned on the spline shaft 44, so that the return stop sections of different cams on the cam group 36 abut against the lever 34. At this time, the action of changing the conveying length of the fiber web is completed.

[0039] 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 by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A transmission device for quickly switching the conveying length for a needle loom, comprising a horizontal plate (1), characterized in that: A vertical plate (11) is fixedly arranged at the end of the horizontal plate (1) and vertically arranged. A driving pulley (12) and a driven pulley (13) are rotatably arranged on the side of the vertical plate (11) away from the horizontal plate (1). One end of the driving pulley (12) and the driven pulley (13) away from the vertical plate (11) is rotatably connected to the second vertical plate (111). Two mutually parallel support plates (112) are arranged between the second vertical plate (111) and the horizontal plate (1). A conveyor belt (14) is sleeved between the driving pulley (12) and the driven pulley (13), and a plurality of convex teeth (141) are evenly distributed on the outer side of the conveyor belt (14); The driving pulley (12) is rotatably connected to the vertical plate (111) through the waist-shaped bearing seat (121), and the two ends of the driven pulley (13) are rotatably arranged on the vertical plate (11) and the vertical plate (111) through the waist-shaped bearing seat (131), respectively, and the conveyor belt (14) is sleeved in the grooves on the outside of the driving pulley (12) and the driven pulley (13); The sides of the vertical plate (11) and the second vertical plate (111) that are close to each other are both provided with a tensioning assembly (2) for tensioning the conveyor belt (14), and a lever mechanism (3) is provided between the driving pulley (12) and the driven pulley (13).

2. A transmission device for quickly switching the conveying length for a needle loom according to claim 1, characterized in that: The lever mechanism (3) comprises a slide plate (32) vertically slidably arranged on the vertical plate (11); the slide plate (32) and the vertical plate (11) are connected via two cross roller guide rail assemblies (31); a plurality of elliptical bearing seats (321) are horizontally arranged on the upper side of the slide plate (32); each elliptical bearing seat (321) is rotatably connected to an extrusion wheel (33); adjacent extrusion wheels (33) are arranged at intervals and parallel to each other; the outer side of each extrusion wheel (33) is arranged in contact with the inner side of the conveyor belt (14); and three tension wheels (21) are arranged.

3. A transmission device for quickly switching the conveying length for a needle loom according to claim 2, characterized in that: A driving plate (322) penetrating the vertical plate (11) is arranged at an edge of the slide plate (32) away from the extrusion wheel (33); a notch for moving the driving plate (322) is arranged on the vertical plate (11); a side of the driving plate (322) away from the extrusion wheel (33) abuts against a lever (34); the lever (34) is rotatably connected to a lever seat (35); the lever seat (35) is fixedly connected to the surface of the horizontal plate (1); the other end of the lever (34) abuts against a cam group (36); and the cam group (36) is arranged on a switching component (4) for controlling the moving position of the cam group (36).

4. A transmission device for quickly switching the conveying length for a needle loom according to claim 3, characterized in that: A small rotating wheel (341) is rotatably provided at both ends of the lever (34), and the two small rotating wheels (341) are respectively abutted against the cam group (36) and the driving plate (322).

5. A transmission device for quickly switching the conveying length for a needle loom according to claim 4, characterized in that: The tensioning assembly (2) comprises a cross roller guide rail assembly (22), the cross roller guide rail assembly (22) comprising guide rails (221) respectively fixedly arranged on the sides of the vertical plate (11) and the second vertical plate (111) close to each other and a slide seat (222) slidably connected to the guide rails (221), the slide seat (222) is bolted to a plate seat (23), the plate seat (23) is rotatably arranged on the side away from the slide seat (222), the tensioning wheel (21) is arranged on the tensioning wheel (21), and the inner side surface of the conveyor belt (14) abuts against the groove (211); The upper end of the plate seat (23) abuts against two tension springs (25), and the other ends of the two tension springs (25) are respectively sleeved on the outsides of two fixing rods (241) of the spring baffle (24), and the spring baffle (24) is bolted to the side of the vertical plate (11).

6. A transmission device for quickly switching the conveying length for a needle loom according to claim 5, characterized in that: The second cross roller guide rail assembly (31) comprises a left slide rail (311) and a right slide rail (312) which are arranged to slide relative to each other. The left slide rail (311) is bolted to the slide plate (32), and the right slide rail (312) is bolted to the vertical plate (11) or the second vertical plate (111). The second cross roller guide rail assembly (31) is vertically arranged on the left and right sides of the slide plate (32).

7. A transmission device for quickly switching the conveying length for a needle loom according to claim 1, characterized in that: The cam group (36) comprises a cam 1 (361), a cam 2 (362), a cam 3 (363) and a cam 4 (364) which are fixedly arranged in parallel in sequence; the cam 1 (361), the cam 2 (362), the cam 3 (363) and the cam 4 (364) are fixedly sleeved on the outer side of the spline sleeve (365); Cam one (361), cam two (362), cam three (363) and cam four (364) respectively include a push-stroke stop segment one (3611), a push-stroke stop segment two (3621), a push-stroke stop segment three (3631) and a push-stroke stop segment four (3641), and the phase angles corresponding to the push-stroke stop segment one (3611), the push-stroke stop segment two (3621), the push-stroke stop segment three (3631) and the push-stroke stop segment four (3641) increase in sequence.

8. A transmission device for quickly switching the conveying length for a needle loom according to claim 1, characterized in that: The switching assembly (4) comprises a servo motor (41) fixedly connected to the side of the horizontal plate (1); a cylindrical cam (42) is fixedly sleeved outside the output shaft of the servo motor (41); a driving sleeve (43) is movably sleeved outside the cylindrical cam (42); the driving sleeve (43) is slidably inserted into a guide sleeve (431); the guide sleeve (431) is bolted to the side of the horizontal plate (1); and an end of the driving sleeve (43) away from the cylindrical cam (42) abuts against a second thrust bearing (444). , thrust bearing 2 (444) is slidably sleeved on the spline shaft (44), the outer side of the spline shaft (44) is slidably sleeved on the spline sleeve (365) of the cam group (36), the other end of the cam group (36) abuts against thrust bearing 1 (441), the other end of thrust bearing 1 (441) abuts against the thrust spring (442), the other end of the thrust spring (442) abuts against the spring stopper (446), and the spring stopper (446) abuts against the shaft shoulder of the spline shaft (44); A cam groove is provided on the cylindrical outer surface of the cylindrical cam (42), the cam groove comprising a first stop platform (421), a second stop platform (422), a third stop platform (423), a fourth stop platform (424) and a return groove (425) which are connected in sequence, and the axial distances between the first stop platform (421), the second stop platform (422), the third stop platform (423) and the fourth stop platform (424) along the cylindrical cam (42) are the same; The driving sleeve (43) comprises a rectangular sleeve (433) and a circular sleeve (434) which are arranged adjacent to each other. The rectangular sleeve (433) and the circular sleeve (434) are both provided with a cylindrical hollow cavity. The rectangular sleeve (433) is slidably inserted into the guide sleeve (431). The circular sleeve (434) is slidably sleeved on the outer side of the cylindrical cam (42). A sliding column (432) is provided on the inner surface of the hollow cavity of the circular sleeve (434). The sliding column (432) slides in the cam groove of the cylindrical cam (42).

9. A transmission device for quickly switching the conveying length for a needle loom according to claim 8, characterized in that: The spline shaft (44) is inserted into the bearing seat (45), and one end of the spline shaft (44) away from the servo motor (41) is rotatably arranged in the vertical plate (11). A driven gear (443) is sleeved on the spline shaft (44) between the bearing seat (45) and the vertical plate (11), and a positioning shaft sleeve (445) is arranged between the driven gear (443) and the vertical plate (11).

10. A transmission device for quickly switching the conveying length for a needle loom according to claim 9, characterized in that: The driven gear (443) is meshedly connected to the driving gear (48), the driving gear (48) is fixedly sleeved on the driving shaft (47), the outer surface of the driving shaft (47) is connected to the second bearing seat (471), one end of the driving shaft (47) close to the second bearing seat (471) is fixedly sleeved to the power input gear (46), and one end of the driving shaft (47) away from the power input gear (46) rotates through the vertical plate (11) and is fixedly inserted in the driving pulley (12); The driving gear (48) is arranged between the second bearing seat (471) and the vertical plate (11), the second positioning sleeve (49) is arranged between the driving gear (48) and the vertical plate (11), and the third positioning sleeve (491) is arranged between the vertical plate (11) and the driving pulley (12).

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