A quick switching transmission device for conveying length of a needle punching machine

Abstract

The application relates to the technical field of needle punching machines, in particular to a transmission device for rapidly switching the conveying length of a needle punching machine, which comprises a horizontal plate, a vertical plate is fixedly arranged at the end of the horizontal plate, a driving pulley and a driven pulley are rotationally arranged on the side of the vertical plate away from the horizontal plate, one end of the driving pulley and the driven pulley away from the vertical plate is rotationally connected to vertical plate two, a conveying belt is sleeved between the driving pulley and the driven pulley, and a plurality of convex teeth are uniformly distributed on the outer side of the conveying belt; the side of the vertical plate and the vertical plate two that are close to each other are both provided with a tensioning assembly for tensioning the conveying belt, and a lever mechanism is arranged between the driving pulley and the driven pulley. 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 conveying belt to the fiber web can be automatically controlled, and the operation is convenient, fast and efficient.

Description

Technical Field

[0001] This invention relates to the field of acupuncture machine technology, specifically to a transmission device for quickly switching the conveying length of an acupuncture machine. Background Technology

[0002] Needle-punched nonwoven fabric is one of the main production processes for nonwoven fabrics, and its main processing equipment is the needle-punching machine. Existing needle-punching machines mainly include a feed curtain, a support plate, a stripping plate, a main drive shaft, a needle plate, and an output roller. The feed curtain feeds the fiber web between the support plate and the stripping plate. The needle plate reciprocates up and down via the main drive shaft, thereby driving the needles on the needle plate to move up and down. When the needles penetrate the fiber web downwards, the fiber web is close to the support plate. When the needles withdraw upwards, the friction between the fiber web and the needles causes the fiber web and needles to move upwards together, with the fiber web close to the stripping plate. After needle punching, the fiber web forms a needle-punched felt with a certain strength, density, and thickness, which is then output by the output roller.

[0003] Because the needle of the needle punching machine pierces the fiber web in a vertical, intermittent motion, while the feeding curtain and output roller transport the fiber web in a horizontal, continuous motion, the fiber web continues to move horizontally after the needle penetrates it, resulting in enlarged needle holes and needle breakage during the needle punching process.

[0004] Existing technologies typically address these issues by using servo motors or stepper motors to achieve intermittent motion. However, this results in frequent motor starts and speed changes, causing motor damage and a short lifespan. Another approach involves using a cam mechanism to drive a contact switch, but adjusting the conveyor speed requires adjusting the cam's mounting position, leading to cumbersome and imprecise adjustments.

[0005] Therefore, a transmission device for quickly switching the conveying length for acupuncture machines is needed to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to solve the above-mentioned problems by providing a transmission device for acupuncture machines that allows for rapid switching of the conveying length, enabling automatic and rapid switching of the conveying length.

[0007] A transmission device for quickly switching the conveying length for an acupuncture machine is provided, including a horizontal plate, a vertical plate fixedly and vertically arranged at the end of the horizontal plate, a driving pulley and a driven pulley rotatably arranged on the side of the vertical plate away from the horizontal plate, the end of the driving pulley and the driven pulley away from the vertical plate being rotatably connected to the vertical plate, and two parallel support plates arranged between the vertical plate and the horizontal plate. A conveyor belt is connected between the driving pulley and the driven pulley, and multiple protruding teeth are evenly distributed on the outer side of the conveyor belt. The driving pulley is rotatably connected to the vertical plate 2 via the waist-shaped bearing seat 1. The two ends of the driven pulley are rotatably mounted on the vertical plate and the vertical plate 2 respectively via the waist-shaped bearing seat 2. The conveyor belt is sleeved in the grooves on the outside of the driving pulley and the driven pulley. Both vertical plates and vertical plate two are provided with tensioning components for tensioning the conveyor belt on their adjacent sides, and a lever mechanism is provided between the driving pulley and the driven pulley.

[0008] Furthermore, the lever mechanism includes a slide plate that is vertically slidably mounted on the vertical plate. The slide plate and the vertical plate are connected by two cross roller guide assemblies. Multiple elliptical bearing seats are horizontally mounted on the upper side of the slide plate. Each elliptical bearing seat is rotatably connected to a compression wheel. Adjacent compression wheels are spaced apart and parallel to each other. The outer side of each compression wheel is in contact with the inner side of the conveyor belt. Three tensioning wheels are provided.

[0009] Furthermore, a drive plate is provided on the edge of the slide away from the extrusion wheel, penetrating the vertical plate. A slot is provided on the vertical plate for the drive plate to move. The side of the drive plate away from the extrusion wheel abuts against a lever. The lever is rotatably connected to a lever seat. The lever seat is fixedly connected to the surface of the horizontal plate. The other end of the lever abuts against a cam group. The cam group is set on a switching component that controls the movement position of the cam group.

[0010] Furthermore, a small rotating wheel is rotatably mounted at both ends of the lever, with the two small rotating wheels respectively abutting against the cam assembly and the drive plate.

[0011] Furthermore, the tensioning assembly includes a cross roller guide assembly one, which includes a guide rail fixedly installed on the sides of the vertical plate and the second vertical plate that are close to each other, and a slide block slidably connected to the guide rail. A plate seat is bolted to the slide block, and a tensioning wheel is rotatably installed on the side of the plate seat away from the slide block. A groove three is provided on the tensioning wheel, and the inner side of the conveyor belt abuts against the groove three. The upper end of the plate base abuts against two tension springs, and the other ends of the two tension springs are respectively sleeved on the outside of the two fixing rods of the spring baffle. The spring baffle is bolted to the side of the vertical plate.

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

[0013] Furthermore, the cam assembly includes cam one, cam two, cam three and cam four, which are fixedly arranged in parallel, and cam one, cam two, cam three and cam four are fixedly sleeved on the outside of the spline sleeve; Cam 1, Cam 2, Cam 3 and Cam 4 respectively include push stroke stop segment 1, push stroke stop segment 2, push stroke stop segment 3 and push stroke stop segment 4, and the phase angles corresponding to push stroke stop segment 1, push stroke stop segment 2, push stroke stop segment 3 and push stroke stop segment 4 increase sequentially.

[0014] Furthermore, the switching component includes a servo motor fixedly connected to the side of the horizontal plate, a cylindrical cam fixedly sleeved on the output shaft of the servo motor, a drive sleeve movably sleeved on the outside of the cylindrical cam, the drive sleeve slidingly inserted into the guide sleeve, the guide sleeve bolted to the side of the horizontal plate, one end of the drive sleeve away from the cylindrical cam abutting against the second thrust bearing, the second thrust bearing slidably sleeved on the spline shaft, the spline sleeve of the cam assembly slidably sleeved on the outside of the spline shaft, the other end of the cam assembly abutting against the first thrust bearing, the other end of the first thrust bearing abutting against the thrust spring, the other end of the thrust spring abutting against the spring retainer, and the spring retainer abutting against the shoulder of the spline shaft; The cylindrical outer surface of the cylindrical cam is provided with a cam groove, which includes a first stop, a second stop, a third stop, a fourth stop and a return groove connected in sequence. The first stop, the second stop, the third stop and the fourth stop are equidistant along the axial direction of the cylindrical cam. The drive sleeve includes a rectangular sleeve and a circular sleeve arranged adjacent to each other. Both the rectangular sleeve and the circular sleeve are provided with a cylindrical hollow cavity. The rectangular sleeve slides through the guide sleeve, and the circular sleeve slides onto the outside of the cylindrical cam. A sliding post is provided on the inner surface of the hollow cavity of the circular sleeve, and the sliding post slides in the cam groove of the cylindrical cam.

[0015] Furthermore, the spline shaft is inserted into the bearing housing, and the end of the spline shaft away from the servo motor is rotatably mounted in the vertical plate. A driven gear is sleeved on the spline shaft between the bearing housing and the vertical plate, and a positioning bushing is provided between the driven gear and the vertical plate.

[0016] Furthermore, the driven gear meshes with the driving gear, the driving gear is fixedly sleeved on the driving shaft, the driving shaft is sleeved with bearing housing two, the end of the driving shaft near the bearing housing is fixedly sleeved with the power input gear, and the end of the driving shaft away from the power input gear rotates through the vertical plate and is fixedly inserted into the driving pulley; The drive gear is located between the bearing housing and the vertical plate. The positioning bushing is located between the drive gear and the vertical plate, and the positioning bushing is located between the vertical plate and the drive pulley.

[0017] The beneficial effects of this invention are as follows: by setting up a lever mechanism, the conveyor belt can intermittently transmit the fiber web; by setting up a switching component, the conveyor belt can automatically control the change of the fiber web transmission length, which is convenient, fast and efficient. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention.

[0019] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the overall three-dimensional bottom view of the present invention; Figure 3 For the present invention Figure 1 Schematic diagram of the structure at point A in the middle; Figure 4 This is a schematic diagram of the structure of the present invention after the conveyor belt is removed; Figure 5 This is a schematic diagram of the second structure of the cross roller guide assembly of the present invention; Figure 6 This is a schematic diagram of the structure of the present invention from another perspective after the conveyor belt is removed; Figure 7 For the present invention Figure 6 Schematic diagram of the structure at point C; Figure 8 This is a schematic diagram of the cross roller guide assembly of the present invention; Figure 9 This is a schematic diagram of the lever mechanism of the present invention; Figure 10 For the present invention Figure 9 Schematic diagram of the structure at point E in the middle; Figure 11 This is a schematic diagram of the cam assembly of the present invention; Figure 12 This is a schematic diagram of the local fracture structure of the cam assembly in an explosive state according to the present invention. Figure 13 This is a schematic diagram of the partial fracture structure of the driving gear and driven gear in an explosive state according to the present invention. Figure 14 This is a schematic diagram of the cylindrical cam structure of the present invention; Figure 15 This is a schematic diagram of another structure of the cylindrical cam of the present invention; Figure 16 This is a schematic diagram of the drive sleeve structure of the present invention; Figure label: 1 Horizontal plate, 11 Vertical plate, 111 Vertical plate II, 112 Support plate, 12 Drive pulley, 121 Waist-shaped bearing seat I, 13 Driven pulley, 131 Waist-shaped bearing seat II, 14 Conveyor belt, 141 Convex tooth; 2 tensioning components, 21 tensioning wheel, 211 groove three, 22 cross roller guide rail assembly one, 221 guide rail, 222 slide, 23 plate base, 24 spring baffle, 241 fixing rod, 25 tensioning spring; 3. Lever mechanism; 31. Cross roller guide assembly II; 311. Left slide rail; 312. Right slide rail; 32. Slide plate; 321. Elliptical bearing seat; 322. Drive plate; 33. Extrusion wheel; 34. Lever; 341. Small rotary wheel; 35. Lever seat; 36. Cam assembly; 361. Cam I; 3611. Push stroke stop section I; 362. Cam II; 3621. Push stroke stop section II; 363. Cam III; 3631. Push stroke stop section III; 364. Cam IV; 3641. Push stroke stop section IV; 365. Spline sleeve; 4. Switching components, 41. Servo motor, 42. Cylindrical cam, 421. First stop, 422. Second stop, 423. Third stop, 424. Fourth stop, 425. Return groove; 43 drive sleeve, 431 guide sleeve, 432 sliding column, 433 rectangular sleeve, 434 circular sleeve; 44 Splined shaft, 441 Thrust bearing one, 442 Thrust spring, 443 Driven gear, 444 Thrust bearing two, 445 Positioning bushing one, 446 Spring retainer, 45 Bearing housing one, 46 Power input gear, 47 Drive shaft, 471 Bearing housing two, 48 Drive gear, 49 Positioning bushing two, 491 Positioning bushing three. Detailed Implementation

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

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

[0022] The driving pulley 12 is rotatably connected to the vertical plate 111 via the waist-shaped bearing seat 121. The two ends of the driven pulley 13 are rotatably mounted on the vertical plate 11 and the vertical plate 111 via the waist-shaped bearing seat 131 respectively. The conveyor belt 14 is sleeved in the grooves on the outside of the driving pulley 12 and the driven pulley 13. The waist-shaped bearing seat 121 and the waist-shaped bearing seat 131 facilitate the high-speed and stable rotation of the driving pulley 12 and the driven pulley 13.

[0023] Tensioning components 2 for tensioning the conveyor belt 14 are provided on the sides of vertical plate 11 and vertical plate 2 111 that are close to each other. A lever mechanism 3 is provided between the driving pulley 12 and the driven pulley 13. The lever mechanism 3 includes a slide plate 32 that is vertically slidably disposed on vertical plate 11. The slide plate 32 and vertical plate 11 are connected by two cross roller guide assemblies 2 31. Multiple elliptical bearing seats 321 are horizontally disposed on the upper side of the slide plate 32. A compression wheel 33 is rotatably connected in each elliptical bearing seat 321. Adjacent compression wheels 33 are spaced apart and parallel to each other. The outer side of each compression wheel 33 is connected to the conveyor belt. The inner side of the conveyor belt 14 is in contact with the lever mechanism 3, which drives the slide plate 32 to move upward. The slide plate 32 drives the extrusion wheel 33 in the elliptical bearing seat 321 to move upward. The extrusion wheel 33 extrudes the conveyor belt 14 and drives the conveyor belt 14 to move upward. When the conveyor belt 14 moves upward, it contacts the fiber web, which can drive the fiber web to be conveyed forward. When the slide plate 32 drives the extrusion wheel 33 to move downward, the extrusion wheel 33 no longer extrudes 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. The intermittent extrusion of the conveyor belt 14 by the extrusion wheel 33 completes the intermittent conveying of the fiber web.

[0024] Further, see Figure 4 There are three tensioning rollers 21. The number of tensioning rollers 21 can also be set as needed to achieve stable conveying of the fiber web.

[0025] Further, see Figure 9 A drive plate 322 is provided on the edge of the slide plate 32 away from the extrusion wheel 33, which penetrates the vertical plate 11. The vertical plate 11 is provided with a slot for the drive plate 322 to move. The side of the drive plate 322 away from the extrusion wheel 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 horizontal plate 1. The other end of the lever 34 abuts against the cam group 36. The cam group 36 is provided on the switching component 4 that controls the movement position of the cam group 36. The axial movement of the cam group 36 is achieved by switching component 4, thereby enabling different cams in the cam group 36 to contact the lever 34. Different cams drive the lever 34 to flip, and the other end of the lever 34 drives the extrusion drive plate 322 when flipping. The drive plate 322 drives the slide plate 32 and the extrusion wheel 33 to extrude the conveyor belt 14. Since different cams cause the extrusion wheel 33 to contact the conveyor belt 14 with the fiber web for different times, the different contact time between the conveyor belt 14 and the fiber web when the conveyor belt 14 rotates at a constant speed results in different conveying distances of the fiber web, thereby achieving the adjustment of the conveying distance of the fiber web.

[0026] Further, see Figure 10Both ends of the lever 34 are equipped with a small rotating wheel 341. The two small rotating wheels 341 abut against the cam group 36 and the drive plate 322 respectively. The setting of the small rotating wheels 341 transforms the sliding friction between the lever 34 and the cam group 36 and the drive plate 322 into rolling friction, reducing friction and improving service life.

[0027] Further, see Figures 6-8 The tensioning assembly 2 includes a cross roller guide assembly 22, which includes a guide rail 221 fixedly disposed on the side of the vertical plate 11 and the second vertical plate 111 that are close to each other, and a slide block 222 slidably connected to the guide rail 221. A plate seat 23 is bolted to the slide block 222. A tensioning wheel 21 is rotatably disposed on the side of the plate seat 23 away from the slide block 222. A groove 3 211 is provided on the tensioning wheel 21, and the inner side of the conveyor belt 14 abuts in the groove 3 211. The upper end of the plate base 23 abuts against two tension springs 25. 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. The spring baffle 24 is bolted to the side of the vertical plate 11. With the setting of the tension springs 25, the tension springs 25 squeeze the plate base 23 and the tension wheel 21 on the plate base 23 to move downward. The two grooves 211 of the tension wheel 21 squeeze the inner side of the conveyor belt 14, thereby achieving tension of the conveyor belt 14. While maintaining the tension of the conveyor belt 14, it provides movement space for the conveyor belt 14, which facilitates the contact between the conveyor belt 14 and the fiber web under the action of the compression wheel 33.

[0028] Further, see Figure 5 The cross roller guide assembly 31 includes a left slide rail 311 and a right slide rail 312 that are slidably arranged 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 vertical plate 111. The cross roller guide assembly 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] Further, see Figure 11 The cam group 36 includes cam 1 361, cam 2 362, cam 3 363 and cam 4 364, which are fixedly arranged in parallel. Cam 1 361, cam 2 362, cam 3 363 and cam 4 364 are fixedly sleeved on the outside of spline sleeve 365. Cam 1 361, cam 2 362, cam 3 363 and cam 4 364 each include a push stroke section, a push stroke stop section, a return stroke section and a return stroke stop section. The push stroke section corresponds to the same lift distance, the return stroke stop section corresponds to the same phase angle, and the starting positions of cam 1 361, cam 2 362, cam 3 363 and cam 4 364 are set in the same way, that is, the zero-degree position of the phase angle coincides.

[0030] Cam 1 (361), Cam 2 (362), Cam 3 (363), and Cam 4 (364) respectively include push-stroke stop segments 1 (3611), 2 (3621), 3 (3631), and 4 (3641), with the phase angles corresponding to these segments increasing sequentially. The different phase angles of these push-stroke stop segments result in different compression times for the compression lever 34, leading to different contact times between the compression wheel 33 and the conveyor belt 14, and consequently, different contact times between the conveyor belt 14 and the fiber web. This alters the conveying distance of the fiber web by the conveyor belt. The number of cams in cam group 36 can be set to more as needed to enable more levels of adjustment and multi-level adjustment of conveying distance.

[0031] Further, see Figures 12-16 The switching component 4 includes a servo motor 41 fixedly connected to the side of the horizontal plate 1. A cylindrical cam 42 is fixedly sleeved on the output shaft of the servo motor 41. A drive sleeve 43 is movably sleeved on the outside of the cylindrical cam 42. The drive sleeve 43 slides through the guide sleeve 431. The guide sleeve 431 is bolted to the side of the horizontal plate 1. The guide sleeve 431 guides and limits the drive sleeve 43, so that the drive sleeve 43 can only slide within the guide sleeve 431. One end of the drive sleeve 43 away from the cylindrical cam 42 abuts against the second thrust bearing 444. The second thrust bearing 444 slides on the spline shaft 44. The outside of the spline shaft 44 slides on the spline sleeve 365 of the cam assembly 36. The other end of the cam assembly 36 abuts against the first thrust bearing 441. The other end of the first thrust bearing 441 abuts against the thrust spring 442. The other end of the thrust spring 442 abuts against the spring retainer 446. The spring retainer 446 abuts against the shoulder of the spline shaft 44. See Figure 14 and Figure 15 The cylindrical cam 42 has a cam groove on its cylindrical outer surface. The cam groove includes a first stop 421, a second stop 422, a third stop 423, a fourth stop 424 and a return groove 425 connected in sequence. The first stop 421, the second stop 422, the third stop 423 and the fourth stop 424 are connected by a transition groove. The first stop 421, the second stop 422, the third stop 423 and the fourth stop 424 are at the same axial distance along the cylindrical cam 42. The drive sleeve 43 includes a rectangular sleeve 433 and a circular sleeve 434 arranged adjacent to each other. Both the rectangular sleeve 433 and the circular sleeve 434 have cylindrical hollow cavities. The rectangular sleeve 433 slides through the guide sleeve 431. Through the sliding connection between the rectangular sleeve 433 and the guide sleeve 431, the rotation of the drive sleeve 43 is restricted, so that the drive sleeve 43 can only slide axially within the guide sleeve 431. The hollow cavity of the rectangular sleeve 433 is used to accommodate the splined shaft 44. The circular sleeve 434 slides on the outside of the cylindrical cam 42. A sliding column 432 is provided on the inner surface of the hollow cavity of 4. The sliding column 432 slides in the cam groove of the cylindrical cam 42. By rotating the cylindrical cam 42, the sliding column 432 slides in the cam groove. The cam groove pushes the sliding column 432 and the drive sleeve 43 to move axially. The drive sleeve 43 squeezes the thrust bearing 444 and the cam group 36, so that the cam group 36 moves on the spline shaft 44. When the cam group 36 moves, different cams of the cam group 36 abut against the lever 34, so that different cams drive the lever 34, thereby realizing the adjustment of the conveying distance.

[0032] The servo motor 41 can control the rotation angle of the cylindrical cam 42. At the same time, the locking device of the servo motor 41 can fix the position of the cylindrical cam 42 to prevent the cylindrical cam 42 from rotating. A position sensor can be set on the spline shaft 44 so that after the spline shaft 44 rotates to the position, 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, the servo motor 41 drives the cylindrical cam 42 to rotate in the state where the spline shaft 44 stops rotating, so as to realize the position movement of the cam group 36. The position sensor and controller are existing technologies and will not be described in detail here.

[0033] Further, see Figure 12 and Figure 13 A splined shaft 44 is inserted into a bearing housing 45. The end of the splined shaft 44 away from the servo motor 41 is rotatably mounted in a vertical plate 11. A ball bearing is provided between the splined shaft 44 and the vertical plate 11. A driven gear 443 is sleeved on the splined shaft 44 between the bearing housing 45 and the vertical plate 11. The driven gear 443 and the splined shaft 44 are connected by a key. A positioning sleeve 445 is provided between the driven gear 443 and the vertical plate 11. The axial position of the splined shaft 44 is fixed by the bearing housing 45 and the vertical plate 11 in cooperation with a shoulder. The relative positioning between the driven gear 443 and the splined shaft 44 is achieved by the positioning sleeve 445 and the shoulder.

[0034] Furthermore, the driven gear 443 meshes with the driving gear 48, which is fixedly sleeved on the driving shaft 47. The driving shaft 47 is sleeved with a bearing housing 471. The end of the driving shaft 47 closest to the bearing housing 471 is fixedly sleeved with a power input gear 46. The end of the driving shaft 47 furthest 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 meshes with other power gears, such as the power device of the needle. Alternatively, the power input gear 46 can be directly replaced with a motor to achieve the rotation of the driving shaft 47, depending on the actual application.

[0035] The drive gear 48 is disposed between the bearing housing 471 and the vertical plate 11. The positioning sleeve 49 is disposed between the drive gear 48 and the vertical plate 11. The positioning sleeve 491 is disposed between the vertical plate 11 and the drive pulley 12. The positioning sleeves 49 and 491 abut against the side of the ball bearing inside the vertical plate 11. The drive shaft 47 is axially fixed by the bearing housing 471 and the vertical plate 11. The drive gear 48 and the drive pulley 12 are axially fixed on the drive shaft 47 by the positioning sleeves 49 and 491.

[0036] Working principle: Power is transmitted from the power input gear 46 to the drive shaft 47. The drive shaft 47 drives the drive pulley 12 to rotate. The drive pulley 12 drives the conveyor belt 14 to rotate continuously. When the extrusion wheel 33 is not extruding 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 drive shaft 47 drives the driven gear 443 to rotate via the drive 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 cam on the cam group 36 squeezes the lever 34. The lever 34 flips. The other end of the lever 34 squeezes the drive plate 322. The drive plate 322 drives the slide plate 32 and the squeeze wheel 33 to move towards the conveyor belt 14. The squeeze wheel 33 pushes the conveyor belt 14 towards the fiber web and presses it against the fiber web. During this process, the conveyor belt 14 drives the fiber web to be conveyed forward. When the cam return stop section on the cam assembly 36 contacts the lever 34 and the cam no longer squeezes the lever 34, the slide plate 32 and the squeezing wheel 33 return to their original positions and no longer squeeze 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 revolution, the conveyor belt 14 contacts the fiber web sequentially, conveying the fiber web once, thereby 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 customized rotation state. The position sensor can stop the spline shaft 44 at a specific position, so that the return stop section of the cam on the cam assembly 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 sliding column 432 and the drive sleeve 43 to move axially. The drive sleeve 43 pushes the cam assembly 36 to move on the spline shaft 44. With the help of the thrust spring 442, the cam assembly 36 can be axially positioned on the spline shaft 44, so that the return stop section of the different cams on the cam assembly 36 abuts against the lever 34. At this time, the action of changing the conveying length of the fiber web is completed.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art will understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A transmission device for quickly switching the conveying length of an acupuncture machine, comprising a horizontal plate (1), characterized in that: A vertical plate (11) is fixed vertically 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). The 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 parallel support plates (112) are arranged between the second vertical plate (111) and the horizontal plate (1). A conveyor belt (14) is connected between the driving pulley (12) and the driven pulley (13), and multiple protruding 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) via the waist-shaped bearing seat (121). The two ends of the driven pulley (13) are rotatably mounted on the vertical plate (11) and the vertical plate (111) respectively via the waist-shaped bearing seat (131). The conveyor belt (14) is sleeved in the grooves on the outside of the driving pulley (12) and the driven pulley (13). Tensioning components (2) for tensioning the conveyor belt (14) are provided on the sides of the vertical plate (11) and the second vertical plate (111) that are close to each other, and a lever mechanism (3) is provided between the driving pulley (12) and the driven pulley (13). The lever mechanism (3) includes a slide plate (32) that is vertically slidably disposed on the vertical plate (11). The slide plate (32) and the vertical plate (11) are connected by two cross roller guide assemblies (31). Multiple elliptical bearing seats (321) are horizontally disposed on the upper side of the slide plate (32). Each elliptical bearing seat (321) is rotatably connected to a compression wheel (33). Adjacent compression wheels (33) are spaced apart and parallel to each other. The outer side of each compression wheel (33) is in contact with the inner side of the conveyor belt (14). There are three tensioning wheels (21). The edge of the slide plate (32) away from the extrusion wheel (33) is provided with a drive plate (322) that penetrates the vertical plate (11). The vertical plate (11) is provided with a slot for the drive plate (322) to move. The side of the drive plate (322) away from the extrusion wheel (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 horizontal plate (1). The other end of the lever (34) abuts against the cam group (36). The cam group (36) is set on the switching component (4) that controls the movement position of the cam group (36).

2. The transmission device for quickly switching the conveying length for an acupuncture machine according to claim 1, characterized in that: Both ends of the lever (34) are equipped with a small rotating wheel (341), which abuts against the cam assembly (36) and the drive plate (322) respectively.

3. The transmission device for quickly switching the conveying length for an acupuncture machine according to claim 2, characterized in that: The tensioning assembly (2) includes a cross roller guide assembly (22), which includes a guide rail (221) fixedly installed on the sides of the vertical plate (11) and the vertical plate (111) respectively, and a slide (222) slidably connected to the guide rail (221). A plate seat (23) is bolted to the slide seat (222). A tensioning wheel (21) is rotatably installed on the side of the plate seat (23) away from the slide seat (222). A groove (211) is provided on the tensioning wheel (21), and the inner side of the conveyor belt (14) abuts in the groove (211). The upper end of the plate base (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). The spring baffle (24) is bolted to the side of the vertical plate (11).

4. The transmission device for quickly switching the conveying length for an acupuncture machine according to claim 3, characterized in that: The cross roller guide assembly 2 (31) includes a left slide rail (311) and a right slide rail (312) that are slidably arranged. 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 vertical plate 2 (111). The cross roller guide assembly 2 (31) is vertically arranged on the left and right sides of the slide plate (32).

5. The transmission device for quickly switching the conveying length for an acupuncture machine according to claim 1, characterized in that: The cam assembly (36) includes cam one (361), cam two (362), cam three (363) and cam four (364) arranged in parallel and fixedly connected. Cam one (361), cam two (362), cam three (363) and cam four (364) are fixedly sleeved on the outside of the spline sleeve (365); Cam 1 (361), Cam 2 (362), Cam 3 (363) and Cam 4 (364) respectively include push stroke stop segment 1 (3611), push stroke stop segment 2 (3621), push stroke stop segment 3 (3631) and push stroke stop segment 4 (3641), and the phase angles corresponding to push stroke stop segment 1 (3611), push stroke stop segment 2 (3621), push stroke stop segment 3 (3631) and push stroke stop segment 4 (3641) increase sequentially.

6. The transmission device for quickly switching the conveying length for an acupuncture machine according to claim 1, characterized in that: The switching component (4) includes a servo motor (41) fixedly connected to the side of the horizontal plate (1). A cylindrical cam (42) is fixedly sleeved on the output shaft of the servo motor (41). A drive sleeve (43) is movably sleeved on the outside of the cylindrical cam (42). The drive sleeve (43) slides through the guide sleeve (431). The guide sleeve (431) is bolted to the side of the horizontal plate (1). The end of the drive sleeve (43) away from the cylindrical cam (42) abuts against the thrust bearing (444). Thrust bearing two (444) is slidably sleeved on spline shaft (44), and the spline sleeve (365) of cam assembly (36) is slidably sleeved on the outside of spline shaft (44). The other end of cam assembly (36) abuts against thrust bearing one (441), the other end of thrust bearing one (441) abuts against thrust spring (442), the other end of thrust spring (442) abuts against spring retainer (446), and spring retainer (446) abuts against the shoulder of spline shaft (44). The cylindrical outer surface of the cylindrical cam (42) is provided with a cam groove, which includes a first stop (421), a second stop (422), a third stop (423), a fourth stop (424) and a return groove (425) connected in sequence. The first stop (421), the second stop (422), the third stop (423) and the fourth stop (424) are at the same axial distance along the cylindrical cam (42). The drive sleeve (43) includes a rectangular sleeve (433) and a circular sleeve (434) 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) slides through the guide sleeve (431), and the circular sleeve (434) slides on the outside of the cylindrical cam (42). The inner surface of the hollow cavity of the circular sleeve (434) is provided with a sliding post (432), which slides in the cam groove of the cylindrical cam (42).

7. A transmission device for quickly switching the conveying length for an acupuncture machine according to claim 6, characterized in that: The spline shaft (44) is inserted into the bearing housing (45). The end of the spline shaft (44) away from the servo motor (41) is rotatably set in the vertical plate (11). A driven gear (443) is sleeved on the spline shaft (44) between the bearing housing (45) and the vertical plate (11). A positioning bushing (445) is set between the driven gear (443) and the vertical plate (11).

8. The transmission device for quickly switching the conveying length for an acupuncture machine according to claim 7, characterized in that: The driven gear (443) meshes with the driving gear (48), the driving gear (48) is fixedly sleeved on the driving shaft (47), the driving shaft (47) is sleeved on the bearing housing (471), the end of the driving shaft (47) near the bearing housing (471) is fixedly sleeved with the power input gear (46), and the 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 drive gear (48) is set between the bearing housing (471) and the vertical plate (11), the positioning bushing (49) is set between the drive gear (48) and the vertical plate (11), and the positioning bushing (491) is set between the vertical plate (11) and the drive pulley (12).

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