CN214529381U - Roving frame for laboratory - Google Patents

Abstract

The utility model relates to a roving frame is used in laboratory, it includes the frame, and frame bottom plate top surface rotates and is connected with the lead screw, and threaded connection has a spindle base on the lead screw, and spindle base and lead screw thread transmission, the spool is installed to spindle base top surface, installs in the frame to be used for driving lead screw pivoted first actuating mechanism, installs in the frame to be used for spindle base along the gliding sliding subassembly of vertical direction. This application has the effect of improving the inhomogeneous problem of spool coiling roving.

Description

Roving frame for laboratory

Technical Field

The application relates to the technical field of textile machinery, in particular to a roving frame for a laboratory.

Background

The roving frame is a spinning machine for making fiber slivers into roving, and mainly plays a role in drafting and twisting, and the roving is wound into a certain package to meet the processing requirements of the spinning frame. The roving process is a spinning process, and the drawn slivers can be processed into different counts and different twists for the spinning process.

Textiles were often woven in the laboratory using small equipment before testing the properties of the newly formulated synthetic textiles.

The chinese utility model patent with the publication number CN2666946 discloses a roving frame keel lifting device, which comprises a roving frame and a keel lifting bracket, wherein the roving frame is provided with a lifting guide pillar; the keel lifting bracket is provided with a bracket upper guide wheel, a bracket lower guide wheel and a bracket movable guide wheel; the bracket upper guide wheel, the bracket lower guide wheel and the bracket movable guide wheel can move up and down along the lifting guide pillar.

With respect to the related art in the above, the inventors consider that: above-mentioned technical scheme is through rack drive spool roving on upwards coiling flyer, if the motor stop work at coiling roving in-process, the rack often falls downwards under the effect of load, and the spool also falls thereupon, needs to coil the roving from the spool top again to cause the inhomogeneous problem of spool coiling roving.

SUMMERY OF THE UTILITY MODEL

In order to improve the inhomogeneous problem of spool coiling roving, this application provides a roving frame is used in laboratory.

The application provides a fly frame is used in laboratory adopts following technical scheme:

the utility model provides a roving frame is used in laboratory, includes the frame, frame bottom plate top surface rotates and is connected with the lead screw, threaded connection has the spindle base on the lead screw, the spindle base with lead screw thread transmission, the spool is installed to spindle base top surface, install in the frame and be used for driving lead screw pivoted first actuating mechanism, install in the frame and be used for the gliding slip subassembly of spindle base along vertical direction.

Through adopting above-mentioned technical scheme, at the winding roving in-process, the fly frame during operation of stopping suddenly, the lead screw stall that promotes the spindle base and rise, under the self-locking function effect of lead screw, the spindle base is difficult for whereabouts downwards under the load effect of spindle base for the spool height stability, more uses rack drive spindle base, utilizes the lead screw can keep spool height stability, when continuing the operation, need not to wind the roving from the spool top, thereby can improve the spool and wind the inhomogeneous problem of roving.

Optionally, the rigid coupling has the backup pad in the frame, the lead screw top pass the backup pad and with the backup pad rotates to be connected, a actuating mechanism includes first motor, first belt pulley and first belt pulley two, first motor rigid coupling in the backup pad, a first belt pulley coaxial rigid coupling in on the output shaft of first motor, the coaxial rigid coupling of first belt pulley two in on the lead screw, first belt pulley one with around being equipped with first belt strip on the first belt pulley two.

Through adopting above-mentioned technical scheme, when needs lead screw drive spindle base goes up and down, first motor drives first belt pulley and rotates, and first belt pulley drives first belt strip transmission, and first belt strip drives first belt pulley two and rotates, and first belt pulley two drives the lead screw and rotates for spindle base can go up and down, and more manual drive lead screw rotates, utilizes a actuating mechanism can improve the convenience of operating personnel operation.

Optionally, a partition plate is fixedly connected to the top surface of the chassis base plate, the sliding assembly includes a sliding rail and a sliding block, the sliding rail is fixedly connected to the side surface of one side of the partition plate, the sliding rail is vertically arranged, the sliding block is in sliding fit with the sliding rail, an angle steel is fixedly connected to the side surface of the sliding block, which is far away from the side of the sliding rail, and the bottom surface of the angle steel is fixedly connected to the top surface of the spindle base.

By adopting the technical scheme, when the spindle base is lifted, the sliding block connected to the spindle base can lift along the sliding rail, and the sliding rail and the sliding block are in rolling friction and sliding friction, so that the friction force generated when the spindle base is lifted can be reduced.

Optionally, two spindles are installed on the top surface of the spindle base, two yarn tubes are provided, the bottoms of the two yarn tubes are respectively sleeved on the spindles, and positioning pieces for fixing the yarn tubes are installed on the spindles.

Through adopting above-mentioned technical scheme, because two spindles are installed to spindle base top surface, all install the spool on two spindles for two roving can be convoluteed simultaneously to the fly frame, are favorable to improving the work efficiency of fly frame.

Optionally, the positioning element comprises two positioning rods, the two positioning rods are fixedly connected to the spindle perpendicularly, and a plurality of positioning grooves matched with the positioning rods are formed in the end face of the top end of the bobbin.

Through adopting above-mentioned technical scheme, because the rigid coupling has the locating lever on the spindle, has seted up the constant head tank on the spool, the locating lever passes through the constant head tank and the spool cooperation to can hinder the spool and skid on the spindle when coiling roving, be favorable to improving the stability when the spool coiling roving.

Optionally, the spindle bottom surface is fixedly connected with a rotating shaft, the rotating shaft is rotatably connected to the top surface of the spindle base, the rotating shaft penetrates through the bottom surface of the spindle base, and the spindle base bottom surface is provided with a second driving mechanism for driving the two rotating shafts to rotate.

Through adopting above-mentioned technical scheme, second actuating mechanism drive pivot is rotated, and the pivot drives the spindle and rotates, and the spindle drives the spool and rotates, rotates through the spool and can improve the efficiency of roving frame rolling.

Optionally, the second driving mechanism includes a second motor, a first second pulley and a second pulley, the second motor is fixedly connected to the spindle base, the first second pulley is coaxially and fixedly connected to an output shaft of the second motor, the second pulley is coaxially and fixedly connected to the bottom ends of the two rotating shafts, and a second pulley strip is wound around the first second pulley and the second pulley.

Through adopting above-mentioned technical scheme, when needs pivot rotated, the second motor drove first rotation of second belt pulley, and first drive second belt pulley drives the transmission of second belt pulley, and the second belt pulley drives two second belt pulleys simultaneously and rotates, alright rotate with the drive pivot, utilize second actuating mechanism can drive two pivots simultaneously and rotate to can reduce the energy resource consumption of fly frame.

Optionally, the second motor is located on a side of the lead screw away from the bobbin, the second motor is fixedly connected to the top surface of the spindle base, and an output shaft of the second motor penetrates through the bottom surface of the spindle base.

Through adopting above-mentioned technical scheme, because the second motor is located the lead screw and keeps away from one side of spool for the atress at spindle base both ends is more even, reduces the spindle base because the emergence of the too big condition of bending that appears of one end load, makes roving frame mechanism compacter simultaneously, reduces space utilization.

In summary, the present application includes at least one of the following beneficial technical effects:

when the roving winding process is carried out and the roving machine is suddenly stopped, the lead screw lifting the spindle base stops rotating, the spindle base is not easy to fall downwards under the load action of the spindle base under the self-locking function of the lead screw, so that the bobbin is highly stable, compared with the method using the rack to drive the spindle base, the bobbin can be kept highly stable by the lead screw, and when the roving winding process is continued, the roving winding process from the top end of the bobbin is not needed, so that the problem that the bobbin is not uniform in roving winding process can be solved;

when the spindle base is required to be driven to ascend and descend by the lead screw, the first motor drives the first belt pulley to rotate, the first belt pulley drives the first belt strip to transmit, the first belt strip drives the second belt pulley to rotate, and the second belt pulley drives the lead screw to rotate, so that the spindle base can ascend and descend, the operation convenience of operators can be improved by the first driving mechanism compared with the manual driving of the lead screw to rotate;

when the spindle base goes up and down, the sliding blocks connected to the spindle base can go up and down along the sliding rails, and the sliding rails and the sliding blocks are in rolling friction and sliding friction, so that the friction force generated when the spindle base goes up and down can be reduced.

Drawings

Fig. 1 is a schematic structural view of a roving frame according to an embodiment of the present application.

Fig. 2 is a schematic view of an internal structure of the roving frame according to the embodiment of the present application.

Fig. 3 is a schematic structural diagram of a first drive mechanism in the roving frame according to the embodiment of the present application.

Fig. 4 is a schematic view of another structure of the roving frame according to the embodiment of the present application.

Fig. 5 is a schematic structural diagram of a second drive mechanism in the roving frame according to the embodiment of the present application.

Fig. 6 is an enlarged schematic view of a portion a in fig. 5.

Fig. 7 is an enlarged schematic view of a portion B in fig. 1.

Description of reference numerals: 1. a frame; 11. a lead screw; 12. a spindle base; 1201. a main board; 1202. an ingot plate; 1203. a side plate; 121. a spindle; 122. a positioning member; 1221. positioning a rod; 123. a rotating shaft; 13. a bobbin; 131. positioning a groove; 14. a support plate; 15. a partition plate; 151. a lifting port; 2. a first drive mechanism; 201. a first belt strip; 21. a first motor; 22. a first belt pulley I; 23. a second belt pulley; 3. a sliding assembly; 31. a slide rail; 32. a slider; 321. angle steel; 4. a second drive mechanism; 401. a second belt; 41. a second motor; 42. a first belt pulley; 43. a second belt pulley II; 5. a drafting device; 51. a bracket, 52, a cradle; 521. a medium iron rod; 522. a leather roller; 53. a roller; 531. an annular groove; 54. a third motor; 55. positioning blocks; 551. steel balls; 56. a strut; 561. a yarn guide bar; 57. a control panel; 6. a winding device; 61. a flyer; 62. a third drive mechanism; 621. a fourth motor; 622. a third belt pulley I; 623. a third belt pulley II; 63. a third belt strip; 7. a yarn barrel; 8. a tension wheel.

Detailed Description

The present application is described in further detail below with reference to figures 1-7.

The embodiment of the application discloses fly frame is used in laboratory. Referring to fig. 1, the roving frame includes a frame 1, a drafting device 5 and a winding device 6, the drafting device 5 is installed on the top surface of the top plate of the frame 1, the winding device 6 is installed on the bottom surface of the top plate of the frame 1, a plurality of yarn barrels 7 are placed on the ground on one side of the back surface of the frame 1, and the number of the yarn barrels 7 can be two in specific implementation.

Referring to fig. 2 and 3, a screw 11 is rotatably connected to the top surface of a bottom plate of the rack 1, the axis of the screw 11 is perpendicular to the center line of the length direction of the bottom plate of the rack 1, a spindle base 12 is connected to the screw 11 in a threaded manner, the screw 11 penetrates through the top surface of the spindle base 12, a first driving mechanism 2 for driving the screw 11 to rotate is installed on the rack 1, and a sliding assembly 3 for the spindle base 12 to slide in the vertical direction is installed on the rack 1; the spindle base 12 comprises a main plate 1201, a spindle plate 1202 and a side plate 1203, the main plate 1201 can be a rectangular flat plate, and the main plate 1201 is in threaded connection with the lead screw 11 and is in threaded transmission with the lead screw 11; the spindle plate 1202 can be a rectangular flat plate, the width of the spindle plate 1202 is larger than that of the main plate 1201, the middle position of the end face of one end of the spindle plate 1202 is integrally formed on the end face of one end, far away from the yarn barrel 7, of the main plate 1201, and the top surface of the spindle plate 1202 is provided with a yarn tube 13; the side plates 1203 may be rectangular parallelepiped flat plates, the number of the side plates 1203 is two, end surfaces of one end of the two side plates 1203 are integrally formed on two side surfaces of the spindle plate 1202 respectively, and the side plates 1203 are located at one end of the spindle plate 1202 close to the main plate 1201.

In the roving winding process, when the first motor 21 is required to stop driving the screw rod 11 to rotate, the spindle base 12 stops lifting, and due to the fact that the spindle base 12 is not prone to falling downwards under the load effect of the spindle base 12 under the self-locking function effect of the screw rod 11, the height of the bobbin 13 is kept fixed, compared with the spindle base 12 driven by a rack, the bobbin 13 can be kept stable in height by the screw rod 11, when the screw rod 11 is continuously driven, the roving is continuously wound along the original winding track, and therefore the problem that the bobbin 13 cannot uniformly wind the roving can be solved.

Referring to fig. 3, a support plate 14 is fixedly connected to the frame 1, the support plate 14 is horizontally disposed, the top end of the screw rod 11 penetrates through the middle position of the support plate 14 and is rotatably connected to the support plate 14, the first driving mechanism 2 includes a first motor 21, a first belt pulley 22 and a second belt pulley 23, the first motor 21 is fixedly connected to the bottom surface of the support plate 14 and is located at one end of the support plate 14, an output shaft of the first motor 21 penetrates through the top surface of the support plate 14, the first belt pulley 22 is coaxially and fixedly connected to an output shaft of the first motor 21, the second belt pulley 23 is coaxially and fixedly connected to the top end of the screw rod 11 and is located at the top surface of the support plate 14, and a first belt strip 201 is wound on the first belt pulley 22 and the second belt pulley 23.

First motor 21 drive first belt pulley 22 rotates, and first belt pulley 22 drives first belt pulley two 23 through first belt strip 201 and rotates, and first belt pulley two 23 drives lead screw 11 and rotates, and lead screw 11 drive spindle base 12 goes up and down, and more manual drive lead screw 11 rotates, utilizes first actuating mechanism 2 can improve the convenience of operating personnel operation.

Referring to fig. 4, a partition plate 15 is vertically and fixedly connected to the top surface of a bottom plate of the frame 1, the partition plate 15 may be a rectangular flat plate, the top end of the partition plate 15 is fixedly connected to the bottom surface of a top plate of the frame 1, the partition plate 15 is located between the bobbin 13 and the lead screw 11, a lifting opening 151 for lifting the main plate 1201 is formed in the end surface of the bottom end of the partition plate 15, and the height of the lifting opening 151 is not less than the length of the lead screw 11. Sliding assembly 3 includes slide rail 31 and slider 32, slide rail 31 has two, slide rail 31 rigid coupling is close to the side of spool 13 one side in baffle 15, two slide rails 31 are located the both sides of going up and down mouthful 151 respectively, and perpendicular with curb plate 1203, slide rail 31's length is greater than the height of going up and down mouthful 151, slider 32 has two, two sliders 32 sliding fit respectively on two slide rails 31, the side rigid coupling that slide rail 31 one side was kept away from to slider 32 has angle steel 321, two angle steel 321 bottom surfaces rigid coupling respectively in the top surface of two curb plates 1203.

During the process that the spindle base 12 ascends and descends along the ascending and descending opening 151, the sliding blocks 32 connected to the spindle base 12 can ascend and descend along the sliding rails 31, and the sliding rails 31 and the sliding blocks 32 are in rolling friction and sliding friction, so that the friction force generated when the spindle base 12 ascends and descends can be reduced.

Referring to fig. 4, 5 and 6, two spindles 121 are mounted on the top surface of the spindle plate 1202, the two spindles 121 are respectively located on two sides of the spindle plate 1202, the two spindles 121 are symmetrical with respect to the center of the spindle plate 1202, there are two bobbins 13, the bottom ends of the two bobbins 13 are respectively sleeved on the spindles 121, and the two bobbins 13 simultaneously wind the roving yarn, which can improve the working efficiency of the roving frame; install the setting element 122 that is used for fixed spool 13 on the spindle 121, setting element 122 includes two locating levers 1221, locating lever 1221 can be cylindric, on the perpendicular rigid coupling of two locating levers 1221 the bottom plate of spindle 121, and about spindle 121 axisymmetric, the terminal surface of spool 13 bottom has seted up a plurality ofly and locating lever 1221 complex constant head tank 131, constant head tank 131 and 13 inner wall of spool intercommunication, constant head tank 131 can be eight, eight constant head tank 131 are along 13 a week evenly distributed of spool.

When the bobbin 13 is wound by the roving, the positioning rod 1221 on the spindle 121 is inserted into the positioning groove 131 of the bobbin 13, so that the bobbin 13 can be prevented from slipping on the spindle 121 when the roving is wound, and the stability of the bobbin 13 when the roving is wound is improved.

Referring to fig. 3 and 5, a rotating shaft 123 is vertically and fixedly connected to the middle position of the bottom surface of the spindle 121, the rotating shaft 123 penetrates through the bottom surface of the spindle plate 1202 and is rotatably connected to the spindle plate 1202, a second driving mechanism 4 for driving the two spindles 121 to rotate is mounted on the bottom surface of the spindle base 12, the second driving mechanism 4 includes a second motor 41, a second pulley i 42 and a second pulley ii 43, the second motor 41 is fixedly connected to the top surface of the main plate 1201, an output shaft of the second motor 41 penetrates through the bottom surface of the main plate 1201, and the second motor 41 is located at one end of the main plate 1201 away from the spindle plate 1202; the first belt pulley 42 is coaxially and fixedly connected to an output shaft of the second motor 41; two second belt pulleys 43 are provided, and the two second belt pulleys 43 are respectively coaxially and fixedly connected to the bottom ends of the two rotating shafts 123 and are positioned on the bottom surface of the spindle plate 1202; two tension wheels 8 are fixedly connected to the bottom surface of the top plate of the frame 1, one tension wheel 8 is located between the first second belt pulley 42 and the second belt pulley 43 and is close to the second belt pulley 43, and the other tension wheel 8 is located between the second belt pulleys 43 and is located on the center line of the spindle plate 1202 in the length direction and is close to the first second belt pulley 42.

The second motor 41 drives the first second belt pulley 42 to rotate, the first second belt pulley 42 drives the second belt pulleys 43 to rotate through the second belt strip 401, the second belt pulleys 43 drive the two rotating shafts 123 to rotate, the rotating shafts 123 drive the spindles 121 to rotate, the spindles 121 drive the bobbins 13 to rotate, the second driving mechanism 4 is utilized to drive the bobbins 13 to rotate, on one hand, the efficiency of winding the rough yarns by the roving frame can be improved, and on the other hand, the energy consumption of the roving frame can be reduced.

In addition, because the second motor 41 is located on one side of the lead screw 11 far away from the bobbin 13, the stress at the two ends of the spindle base 12 is more uniform, the occurrence of bending of the spindle base 12 due to the fact that one end of the spindle base is overloaded is reduced, meanwhile, the roving frame mechanism is more compact, and the space utilization rate is reduced.

Referring to fig. 1, 2 and 7, the drafting device 5 comprises a support 51, a cradle 52 and a roller 53, wherein the support 51 is fixedly connected to the top surface of the top plate of the frame 1, the cradle 52 is rotatably connected to the support 51, the top surface of the cradle 52 is fixedly connected with three middle iron rods 521, and two ends of each middle iron rod 521 are respectively sleeved with a leather roller 522; three rollers 53 are provided, the three rollers 53 are rotatably connected to the bracket 51, and three third motors 54 for driving the three rollers 53 to rotate are fixedly connected to a side plate 1203 on one side of the frame 1; an annular groove 531 is formed in the circumferential surface of one end, away from the third motor 54, of the roller 53, a positioning block 55 is fixedly connected to the side surface of the bracket 51, close to the annular groove 531, the positioning block 55 is located on the bottom surface of the roller 53, a steel ball 551 is rotatably connected to the side surface of the positioning block 55, close to the roller 53, and the steel ball 551 rolls in the annular groove 531. A supporting rod 56 is fixedly connected to the top surface of the top plate of the frame 1, the supporting rod 56 is located at one end, close to the yarn barrel 7, of the top plate of the frame 1, a yarn guide rod 561 is fixedly connected to the supporting rod 56, a control panel 57 is fixedly connected to the top surface of the top plate of the frame 1, and the control panel 57 is located on one side of the supporting rod 56.

Referring to fig. 4, the winding device 6 comprises two flyers 61 and a third driving mechanism 62, the two flyers 61 are rotatably connected to the bottom surface of the top plate of the frame 1 and penetrate through the top surface of the top plate of the frame 1, and the two flyers 61 are respectively matched with the two spindles 121; the third driving mechanism 62 comprises a fourth motor 621, a first third belt pulley 622 and a second third belt pulley 623, the fourth motor 621 is fixedly connected to the top plate of the frame 1, the fourth motor 621 is located on the bottom surface of the roller 53, the first third belt pulley 622 is coaxially fixedly connected to the output shaft of the fourth motor 621, the two second third belt pulleys 623 are coaxially fixedly connected to the two flyers 61 and located on the top surface of the top plate of the frame 1, and third belt strips 63 are wound on the first third belt pulley 622 and the second third belt pulley 623; a tension wheel 8 is fixedly connected to the top surface of the top plate of the frame 1, and the tension wheel 8 is located on the center line of the top plate of the second frame 1 in the length direction and located between the first third belt pulley 622 and the second third belt pulley 623.

The implementation principle of the roving frame for the laboratory in the embodiment of the application is as follows: when the first motor 21 stops working, the lead screw 11 loses a rotating power source, and because the lead screw 11 has a self-locking function, the spindle base 12 is not easy to slide downwards under the action of the load, so that the position of the spindle base 12 is kept stable, the height of the bobbin 13 is kept stable, compared with the spindle base 12 driven by a rack, the bobbin 13 can be kept highly stable by the lead screw 11, when the lead screw 11 is continuously driven, the roving is continuously wound along the original winding track, and the problem that the bobbin 13 is not uniform around the roving can be improved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. The utility model provides a roving frame is used in laboratory which characterized in that: the yarn winding machine comprises a rack (1), wherein a lead screw (11) is rotatably connected to the top surface of a bottom plate of the rack (1), a spindle base (12) is connected to the lead screw (11) in a threaded mode, the spindle base (12) is in threaded transmission with the lead screw (11), a bobbin (13) is installed on the top surface of the spindle base (12), a first driving mechanism (2) used for driving the lead screw (11) to rotate is installed on the rack (1), and a sliding assembly (3) used for the spindle base (12) to slide along the vertical direction is installed on the rack (1).

2. The roving frame for laboratories according to claim 1, wherein: the rigid coupling has backup pad (14) on frame (1), lead screw (11) top is passed backup pad (14) and with backup pad (14) rotate to be connected, first actuating mechanism (2) include first motor (21), first belt pulley (22) and first belt pulley two (23), first motor (21) rigid coupling in on backup pad (14), first belt pulley (22) coaxial rigid coupling in on the output shaft of first motor (21), first belt pulley two (23) coaxial rigid coupling in on lead screw (11), first belt pulley one (22) with around being equipped with first belt strip (201) on first belt pulley two (23).

3. The roving frame for laboratories according to claim 1, wherein: the top surface of a bottom plate of the rack (1) is vertically and fixedly connected with a partition plate (15), the sliding assembly (3) comprises a sliding rail (31) and a sliding block (32), the sliding rail (31) is fixedly connected to the side surface of one side of the partition plate (15), the sliding rail (31) is vertically arranged, the sliding block (32) is in sliding fit with the sliding rail (31), an angle steel (321) is fixedly connected to the side surface, far away from the sliding rail (31), of the sliding block (32), and the bottom surface of the angle steel (321) is fixedly connected to the top surface of the spindle base (12).

4. The roving frame for laboratories according to claim 1, wherein: two spindles (121) are mounted on the top surface of the spindle base (12), two yarn tubes (13) are arranged, the bottom ends of the two yarn tubes (13) are respectively sleeved on the spindles (121), and positioning parts (122) used for fixing the yarn tubes (13) are mounted on the spindles (121).

5. The roving frame for laboratories according to claim 4, wherein: the positioning piece (122) comprises two positioning rods (1221), the two positioning rods (1221) are vertically and fixedly connected to the spindle (121), and the end face of the top end of the bobbin (13) is provided with a plurality of positioning grooves (131) matched with the positioning rods (1221).

6. The roving frame for laboratories according to claim 4, wherein: the bottom surface of the spindle (121) is fixedly connected with a rotating shaft (123), the rotating shaft (123) is rotatably connected to the top surface of the spindle base (12), the rotating shaft (123) penetrates through the bottom surface of the spindle base (12), and a second driving mechanism (4) for driving the two rotating shafts (123) to rotate is arranged on the bottom surface of the spindle base (12).

7. The roving frame for laboratories according to claim 6, wherein: the second driving mechanism (4) comprises a second motor (41), a first second belt pulley (42) and a second belt pulley (43), the second motor (41) is fixedly connected to the spindle base (12), the first second belt pulley (42) is coaxially and fixedly connected to an output shaft of the second motor (41), the number of the second belt pulleys (43) is two, the two second belt pulleys are respectively and coaxially and fixedly connected to the bottom ends of the two rotating shafts (123), and a second belt pulley (401) is wound on the first second belt pulley (42) and the second belt pulley (43).

8. The roving frame for laboratories according to claim 7, wherein: the second motor (41) is positioned on one side of the lead screw (11) far away from the yarn tube (13), the second motor (41) is fixedly connected to the top surface of the spindle base (12), and an output shaft of the second motor (41) penetrates through the bottom surface of the spindle base (12).

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