CN216235355U

CN216235355U - Tension adjusting device of doubling machine

Info

Publication number: CN216235355U
Application number: CN202122438122.7U
Authority: CN
Inventors: 薛书兵; 孔琴; 俞小华; 张志勇
Original assignee: Changshu Huarui Needle Textile Co ltd
Current assignee: Changshu Huarui Needle Textile Co ltd
Priority date: 2021-10-11
Filing date: 2021-10-11
Publication date: 2022-04-08
Anticipated expiration: 2031-10-11

Abstract

The application relates to the field of yarn doubling, in particular to a tension adjusting device of a doubling machine, which comprises an installation box, wherein a tension induction piece used for inducing the tension of a yarn is arranged on the installation box, and a first transmission wheel which is in transmission connection with the pressurized and pulled yarn and is abutted against the pressurized and pulled yarn is arranged on the tension induction piece; the installation box is provided with a first telescopic rod and a telescopic adjusting mechanism for controlling the tension of the silk thread by controlling the telescopic of the first telescopic rod, and the telescopic adjusting mechanism is electrically connected with the tension sensing piece; and a second wire transmission wheel which is used for being connected with and abutting against the silk thread in a transmission manner is arranged on the first telescopic rod. The problem of silk thread fracture appears easily at the in-process that is being pressurizeed and is pulled is convenient for solve to this application.

Description

Tension adjusting device of doubling machine

Technical Field

The application relates to the field of yarn doubling, in particular to a tension adjusting device of a doubling machine.

Background

At present, when a doubling machine is used for doubling threads, the threads on a plurality of thread outlet bobbins generally enter a main thread guide hook after passing through a plurality of thread guide hooks, and then are pressurized by a pressure regulating device to complete doubling and winding.

With respect to the related art among the above, the inventors consider that the following drawbacks exist: because the tension that each wire pair can bear in the process of being pressurized and pulled is different, the problem that the wire is easy to break in the process of being pressurized and pulled is caused because the tension adjustment of the wire is generally ignored in the existing equipment.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that the silk thread is easy to break in the process of being pressed and pulled, the application provides a tension adjusting device of a doubling machine.

The application provides a tension adjusting device of doubling machine adopts following technical scheme:

a tension adjusting device of a doubling machine comprises an installation box, wherein a tension sensing piece used for sensing tension of a silk thread is arranged on the installation box, and a first transmission line wheel which is in transmission connection and abutted with the silk thread pulled by pressurization is arranged on the tension sensing piece; the installation box is provided with a first telescopic rod and a telescopic adjusting mechanism for controlling the tension of the silk thread by controlling the telescopic of the first telescopic rod, and the telescopic adjusting mechanism is electrically connected with the tension sensing piece; and a second wire transmission wheel which is used for being connected with and abutting against the silk thread in a transmission manner is arranged on the first telescopic rod.

Through adopting above-mentioned technical scheme, can respond to the tension on the silk thread through tension response earlier, and generate the signal that can control flexible adjustment mechanism, it is flexible to be convenient for make first telescopic link through flexible adjustment mechanism according to this signal, because the second biography reel on silk thread and the first telescopic link offsets, so the second biography reel is along with first telescopic link is flexible in, can apply the power of different dynamics to the silk thread, thereby be convenient for adjust the tension of silk thread, thereby be convenient for solve the silk thread and appear cracked problem easily at the in-process that is exerted pressure and stimulates.

Preferably, the tension sensing part comprises a first telescopic pipe, a second telescopic rod with one end extending out of the first telescopic pipe is slidably arranged on the first telescopic pipe, a stop block is fixed at one end of the second telescopic rod extending out of the first telescopic pipe, a return spring is abutted between the stop block and the first telescopic pipe, and the first transmission wheel is rotatably connected to the stop block; one end of the second telescopic rod, which is positioned in the first telescopic pipe, is connected with a tension sensor fixed on the first telescopic pipe

By adopting the technical scheme, when the tension of the silk thread is increased, the silk thread can apply larger pressure to the first wire transmission wheel, so that the stop block and the first telescopic pipe can extrude the reset spring, the second telescopic rod can move towards the first telescopic pipe, the tension between the second telescopic rod and the tension sensor can be changed, and the tension of the silk thread can be sensed by the tension sensor; when the tension of silk thread diminishes, the pressure that the silk thread applied to first wire transmission wheel also can diminish, and the second telescopic link moves outside first telescopic pipe under reset spring's drive to pulling force between second telescopic link and the force sensor can change, and then responds to the tension of silk thread through force sensor.

Preferably, the first telescopic pipe is provided with a plurality of first limiting long grooves axially arranged along the first telescopic pipe, and the second telescopic pipe is provided with a plurality of first limiting blocks extending into the first limiting long grooves and sliding in the first limiting long grooves.

Through adopting above-mentioned technical scheme, because first stopper on the second telescopic link is restricted at first spacing elongated slot and slides, so the second telescopic link only can follow first flexible pipe axial motion, so be convenient for prevent that the second telescopic link from taking place to rotate at the in-process that passes through first wire transmission wheel conveying silk thread, so can be convenient for promote the stability of conveying silk thread process.

Preferably, both ends of the first limiting long groove can abut against the corresponding first limiting blocks.

By adopting the technical scheme, the first limiting block on the second telescopic rod can be abutted against the two ends of the first limiting long groove, so that the second telescopic rod can be limited to be used in the first telescopic pipe and cannot be separated from the first telescopic pipe, and the stability of the second telescopic rod in use is improved.

Preferably, the tension sensor is arranged on the outer side wall of the first telescopic pipe, a pulley is further rotatably connected to the first telescopic pipe, and a transmission rope in transmission connection with the pulley is connected between the second telescopic pipe and the tension sensor.

Through adopting above-mentioned technical scheme, because force sensor sets up on the lateral wall of first flexible pipe, and is connected the driving rope on the pulley through the transmission and is connected with the second telescopic link, and not with force sensor direct and second telescopic link coaxial coupling, not only be convenient for like this install force sensor and first flexible pipe on the install bin, and do not need force sensor and the second telescopic link that the install bin is coaxial coupling to reserve longer space.

Preferably, the telescopic adjusting mechanism comprises a second telescopic pipe, the first telescopic rod is connected in the second telescopic pipe in a sliding manner, and one end of the first telescopic rod extends out of the second telescopic pipe; and the second telescopic pipe is connected with a vacuum pump for enabling the first telescopic rod to retract into the second telescopic pipe and an air compressor for enabling the first telescopic rod to extend out of the second telescopic pipe.

By adopting the technical scheme, when the first telescopic rod needs to be retracted into the second telescopic pipe, a negative pressure environment can be formed in the second telescopic pipe through the vacuum pump, so that the first telescopic rod can be conveniently retracted into the second telescopic pipe; when the first telescopic rod needs to extend out of the second telescopic pipe, a high-pressure environment can be formed in the second telescopic pipe through the air compressor, so that the first telescopic rod can extend out of the second telescopic pipe conveniently.

Preferably, the telescopic adjusting mechanism further comprises a controller electrically connected with the tension sensing member; a first air duct with a first electric valve is connected between the vacuum pump and the second telescopic tube, and a second air duct with a second electric valve is connected between the air compressor and the second telescopic tube; the first electrically operated valve and the second electrically operated valve are both electrically connected to the controller.

By adopting the technical scheme, when the vacuum pump is required to be used, the opening of the first electric valve on the first air duct can be conveniently controlled by the controller, and the closing of the second electric valve on the second air duct can be conveniently controlled; when the air compressor is needed, the opening of the second electric valve on the second air duct can be conveniently controlled by the controller, and the closing of the first electric valve on the first air duct can be conveniently controlled; thereby facilitating the selective use of either the vacuum pump or the air compressor by the controller.

Preferably, one end of the second telescopic pipe, which is far away from the second wire transmission wheel, is provided with a pressure chamber extending into the first telescopic rod, and one end of the first telescopic rod, which extends into the pressure chamber, is provided with a sealing gasket tightly attached to the inner side wall of the pressure chamber and capable of sliding in the pressure chamber; the first air duct and the second air duct are both connected to one end, far away from the second telescopic tube, of the pressure bin.

By adopting the technical scheme, when the space of the pressure bin, close to one side of the first air duct and the second air duct, of the sealing gasket forms a negative pressure environment through the first air duct under the action of the vacuum pump, the sealing gasket can drive the first telescopic rod connected with the sealing gasket to retract into the second telescopic tube; when the space of the pressure bin, close to the first air duct and at one side of the second air duct, of the sealing gasket forms a high-pressure environment through the first air duct under the action of the air compressor, the sealing gasket can drive the first telescopic rod connected with the sealing gasket to extend out of the second telescopic pipe.

Preferably, a plurality of second limiting long grooves are formed in the second telescopic pipe and are axially arranged along the second telescopic pipe, and a plurality of second limiting blocks which extend into the second limiting long grooves and can slide in the second limiting long grooves are arranged on the first telescopic pipe.

By adopting the technical scheme, the second limiting block on the first telescopic rod is limited to slide in the second limiting long groove, so that the first telescopic rod can only axially move along the second telescopic pipe, the first telescopic rod is convenient to prevent from rotating in the process of conveying the silk threads through the second thread conveying wheel, and the stability in the process of conveying the silk threads can be improved.

Preferably, both ends of the second limiting long groove can be abutted against the corresponding second limiting block.

By adopting the technical scheme, the second limiting block on the first telescopic rod can be abutted against the two ends of the second limiting long groove, so that the first telescopic rod can be limited to be used in the second telescopic pipe and cannot be separated from the second telescopic pipe, and the stability of the first telescopic rod in use is improved.

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

1. the tension on the silk thread is sensed by the tension sensing piece and a corresponding signal is generated, the signal is transmitted to the telescopic adjusting mechanism, and the telescopic adjusting mechanism controls the first telescopic rod for telescopically adjusting the tension of the silk thread according to the signal, so that the tension of the silk thread is adjusted, and the problem that the silk thread is broken in the process of being pressurized and pulled is solved;

2. a first limiting long groove is formed in the second telescopic pipe, and a first limiting block which slides along the axial direction of the second telescopic pipe is arranged on the first limiting long groove on the second telescopic pipe, so that the second telescopic pipe is convenient to ensure that the second telescopic pipe cannot rotate when the silk threads are transmitted through the first silk thread transmission wheel, and the stability of the silk thread transmission process is convenient to improve;

3. the vacuum pump is selected and connected with the second telescopic pipe, so that a negative pressure environment can be conveniently built in the second telescopic pipe, and the first telescopic pipe on the second telescopic pipe can be conveniently contracted into the second telescopic pipe; through chooseing for use air compressor and the flexible union coupling of second to can be convenient for build high-pressure environment in the flexible intraductal second, and then be convenient for make the flexible first telescopic link on the second stretch out and draw out outside the flexible pipe of second.

Drawings

Fig. 1 is a schematic view of an overall structure of a tension adjusting device of a doubling machine according to an embodiment of the present disclosure.

Fig. 2 is a schematic structural diagram for showing a positional relationship between the thread tension sensing mechanism and the telescoping adjustment mechanism according to an embodiment of the present application.

Fig. 3 is an enlarged view of a portion a in fig. 2.

Fig. 4 is a schematic structural diagram for showing a positional relationship among the installation box, the thread tension sensing mechanism and the telescopic adjusting mechanism according to the embodiment of the present application.

Fig. 5 is an enlarged view of a portion B in fig. 4.

Description of reference numerals: 1. a base; 2. installing a box; 3. a wire tension sensing mechanism; 31. a tension sensing member; 32. a first wire transfer wheel; 33. a first telescopic tube; 331. a first limit long groove; 34. a second telescopic rod; 341. a first stopper; 35. a stopper; 36. a return spring; 37. a tension sensor; 38. a pulley; 39. a drive rope; 4. a telescopic adjusting mechanism; 41. a second telescopic tube; 411. a second limiting long groove; 42. a first telescopic rod; 421. a second limiting block; 43. a second wire transfer wheel; 44. a vacuum pump; 441. a first air duct; 442. a first electrically operated valve; 45. an air compressor; 451. a second air duct; 452. a second electrically operated valve; 46. a pressure bin; 47. a gasket; 5. a silk thread output seat; 6. a silk thread limiting seat; 7. a filament concentrating seat; 8. a silk thread collecting seat; 9. and a controller.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses tension adjusting device of a doubling machine. Referring to fig. 1, a tension adjusting device of a doubling machine includes a base 1, and a vertically disposed installation box 2 is connected to one side edge of the base 1, in this embodiment, for convenience of describing the technical concept, the technical solution of the present application is described by only setting two yarn output seats 5 for outputting yarns on a top wall of the base 1 as an example, but it should be understood by those skilled in the art that, in practical application, 3, 4, etc. yarn output seats 5 may be further provided on the base 1 according to specific situations, and the present application is not limited thereto.

Referring to fig. 1, a silk thread is wound on the silk thread output seat 5, two silk thread limiting seats 6 which are in one-to-one correspondence with the silk thread output seats 5 are arranged on the side wall of the installation box 2 close to the base 1, and the silk thread limiting seats 6 are used for transmitting the silk threads output from the silk thread output seats 5. And a silk thread tension induction mechanism 3 for inducing the tension of each silk thread is arranged on the installation box 2 and close to the position above each silk thread limiting seat 6.

Referring to fig. 2 and 3, each thread tension sensing mechanism 3 comprises a tension sensing member 31, for example, a tension sensing member 31, a portion of the tension sensing member 31 is embedded in the mounting seat, and a first wire transmission wheel 32 for transmitting the thread and abutting against the thread is rotatably connected to a portion of the tension sensing member 31 extending out of the mounting seat.

The position that lies in every silk thread tension induction mechanism 3 top on the install bin 2 all is equipped with the flexible adjustment mechanism 4 that is used for adjusting silk thread tension, and flexible adjustment mechanism 4 is including can stretching out the first telescopic link 42 of install bin 2 lateral wall that is close to base 1, and the flexible adjustment mechanism 4 of 3 accessible of silk thread tension induction mechanism controls the flexible of first telescopic link 42, and rotates on the first telescopic link 42 to be connected with and is used for conveying the silk thread and with the second biography line wheel 43 that the silk thread offseted.

The side wall of the mounting seat close to the base 1 is also provided with a silk thread concentration seat 7 for concentrating two silk threads and a silk thread collection seat 8 which is positioned above the silk thread concentration seat 7 and collects the concentrated silk threads together in a rotating mode.

Referring to fig. 2 and 3, the tension sensing member 31 of the thread tension sensing mechanism 3 includes a first telescopic pipe 33, the first telescopic pipe 33 is located in the installation box 2, one end of the first telescopic pipe 33 is flush with the side wall of the installation box 2 close to the base 1, and the other end of the first telescopic pipe 33 extends into the installation box 2.

The inner side wall of the first expansion pipe 33 is provided with a plurality of first limiting long grooves 331 along the axial direction of the first expansion pipe 33. A second telescopic rod 34 capable of extending out of the installation box 2 is slidably arranged in the first telescopic tube 33, a plurality of first limiting blocks 341 which correspond to the first limiting long grooves 331 one by one and extend into the corresponding first limiting long grooves 331 are arranged on the side wall of the second telescopic rod 34, and each first limiting block 341 can abut against two ends of the corresponding first limiting long groove 331. In this way, the second expansion link 34 can be limited to slide in the corresponding first limiting long groove 331 through the first limiting block 341 and cannot rotate in the first extension tube 33, and since each first limiting block 341 can abut against two ends of the corresponding first limiting long groove 331, the second expansion link 34 is also difficult to fall off from the corresponding first extension tube 33 in the process of moving along the axial direction of the first extension tube 33.

One end of the second telescopic rod 34 extending out of the first telescopic tube 33 is provided with a stop block 35 with a section larger than that of the second telescopic rod 34, the first wire transmission wheel 32 is rotatably connected to the side wall of the stop block 35 far away from the second telescopic rod 34, and the wire is abutted to the position of the first wire transmission wheel 32 far away from the stop block 35. A return spring 36 surrounding the second telescopic rod 34 is abutted between the stop 35 and the first telescopic tube 33. When the tension of the silk thread is increased, the silk thread applies a force moving towards the inside of the first extension tube 33 to the second extension rod 34 through the first transmission wheel 32, and when the tension of the silk thread is weakened, the second extension rod 34 moves towards the outside of the first extension tube 33 under the action of the return spring 36.

One end of the first extension tube 33 extending into the installation box 2 is rotatably connected with a pulley 38, a tension sensor 37 is fixed on the side wall of the first extension tube 33, and a transmission rope 39 passing through the pulley 38 is connected between the tension sensor 37 and the second extension tube 34. Along with the movement of the second telescopic rod 34 in the first telescopic tube 33, the tension sensor 37 can sense different tension forces through the driving rope 39.

Referring to fig. 2 and 3, a controller 9 is disposed in the installation box 2 and between the thread tension sensing mechanism 3 and the stretching and retracting mechanism 4, and the tension sensor 37 is electrically connected to the controller 9 and configured to output a tension signal generated by sensing tension to the controller 9. The controller 9 is used for controlling the telescopic adjusting mechanism 4 conveniently according to the acquired tension signal, so that the tension of the silk thread can be adjusted conveniently through the telescopic adjusting mechanism 4.

Referring to fig. 4 and 5, taking one of the telescopic adjusting mechanisms 4 as an example, the telescopic adjusting mechanism 4 includes a second telescopic pipe 41 which is arranged on the installation box 2 and is parallel to the first telescopic pipe 33, and a pipe opening of the second telescopic pipe 41 is opened on a side wall of the installation box 2 close to the base 1. The first telescopic rod 42 is slidably mounted on the second telescopic tube 41, and one end of the first telescopic rod 42 extends out of the second telescopic tube 41. A plurality of second limiting long grooves 411 are formed in the inner side wall of the second extension tube 41 and axially along the second extension tube 41, and a plurality of second limiting blocks 421 which are in one-to-one correspondence with each second fiber long groove and can slide in the corresponding second limiting long grooves 411 are formed in the side wall of the first extension rod 42.

One end of the first telescopic rod 42 extending out of the second telescopic tube 41 is rotatably connected with a second wire transmission wheel 43 for transmitting the silk threads, and the part of the second wire transmission wheel 43 close to the first telescopic rod 42 is abutted against the silk threads. In the initial state, the second pulley 43 is closer to the mounting case 2 than the first pulley 32. The end of the installation box 2, which is located at the second extension tube 41 and is far away from the second wire transmission wheel 43, is provided with a cylindrical pressure chamber 46, one end of the pressure chamber 46 is communicated with the second extension tube 41, one end of the first extension rod 42 extends into the pressure chamber 46, and one end of the first extension rod 42 extending into the pressure chamber 46 is provided with a disc-shaped sealing gasket 47 which can be tightly abutted against the inner side wall of the pressure chamber 46.

A vacuum pump 44 is arranged in the installation box 2, a first air duct 441 is connected between the vacuum pump 44 and the pressure chamber 46, one end of the first air duct 441 is connected with the end face of the pressure chamber 46 far away from the second telescopic tube 41, and a first electric valve 442 controlled to be opened and closed by the controller 9 is arranged on the first air duct 441.

The installation box 2 is further provided with an air compressor 45, a second air duct 451 is connected between the air compressor 45 and the pressure chamber 46, one end of the second air duct 451 is also connected with the end face of the pressure chamber 46 far away from the second telescopic tube 41, and the second air duct 451 is provided with a second electric valve 452 controlled to be opened and closed by the controller 9.

The air compressor 45 and the vacuum pump 44 are both electrically connected to the controller 9, and the controller 9 may be a PLC controller. When the tension of the silk thread is large, the controller 9 can open the first electric valve 442 and close the second electric valve 452, so that the air compressor 45 can be controlled to be started conveniently, high-pressure air is injected into the pressure bin 46, the pressure in the pressure bin 46 is increased, the first telescopic rod 42 connected with the sealing gasket 47 can be pushed to gradually extend out of the second telescopic pipe 41, the silk thread between the first wire transmission wheel 32 and the second wire transmission wheel 43 is gradually made to be parallel to the side wall, close to the base 1, of the installation box 2, and therefore the length of the silk thread between the first wire transmission wheel 32 and the second wire transmission wheel 43 can be shortened, and the effect of reducing the tension of the silk thread is achieved.

When the tension of the yarn is small, the controller 9 is convenient to open the second electric valve 452, close the first electric valve 442, and control the vacuum pump 44 to start so as to generate negative pressure in the pressure chamber 46 and move the sealing pad 47 toward the end of the pressure chamber 46 away from the second telescopic tube 41, so that the first telescopic rod 42 connected with the sealing pad 47 can be pushed to gradually retract the second telescopic tube 41, and the length of the yarn between the first wire transmission wheel 32 and the second wire transmission wheel 43 is gradually increased, thereby achieving the effect of increasing the tension of the yarn.

The tension adjusting device of the doubling machine in the embodiment of the application has the following implementation principle: the tension of the silk thread is sensed by a silk thread tension sensing mechanism 3; if the tension of the silk threads is sensed to be large, the controller 9 enables the air compressor 45 to inject high-pressure air into the second extension tube 41 to push the first extension tube 42 to extend out of the second extension tube 41, so that the length of the silk threads between the first wire transmission wheel 32 and the second wire transmission wheel 43 is shortened, and the effect of reducing the tension of the silk threads is achieved; if the tension of the silk thread is sensed to be small, the controller 9 enables the vacuum pump 44 to create a negative pressure environment in the pressure bin 46, so that the first telescopic rod 42 is attracted to retract into the second telescopic pipe 41, the length of the silk thread between the first conducting wire wheel 32 and the second conducting wire wheel 43 is lengthened, and the effect of increasing the tension of the silk thread is achieved.

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

1. The utility model provides a tension adjusting device of doubling machine which characterized in that: the tension sensing device comprises a mounting box (2), wherein a tension sensing piece (31) used for sensing tension of a silk thread is arranged on the mounting box (2), and a first wire transmission wheel (32) which is in transmission connection with and abuts against the pressurized and pulled silk thread is arranged on the tension sensing piece (31); the installation box (2) is provided with a first telescopic rod (42) and a telescopic adjusting mechanism (4) for controlling the tension of the silk thread by controlling the telescopic of the first telescopic rod (42), and the telescopic adjusting mechanism (4) is electrically connected with the tension sensing piece (31); and a second wire transmission wheel (43) which is used for being connected with and abutting against the silk thread in a transmission way is arranged on the first telescopic rod (42).

2. The tension adjusting apparatus of a doubling machine according to claim 1, wherein: the tension sensing piece (31) comprises a first telescopic pipe (33), a second telescopic rod (34) with one end extending out of the first telescopic pipe (33) is arranged on the first telescopic pipe (33) in a sliding mode, a stop block (35) is fixed to one end, extending out of the first telescopic pipe (33), of the second telescopic rod (34), a reset spring (36) is abutted between the stop block (35) and the first telescopic pipe (33), and the first transmission wheel (32) is connected to the stop block (35) in a rotating mode; one end of the second telescopic rod (34) positioned in the first telescopic pipe (33) is connected with a tension sensor (37) fixed on the first telescopic pipe (33).

3. The tension adjusting apparatus of a doubling machine according to claim 2, wherein: a plurality of first limiting long grooves (331) axially arranged along the first telescopic pipe (33) are arranged in the first telescopic pipe (33), and a plurality of first limiting blocks (341) extending into the first limiting long grooves (331) and sliding in the first limiting long grooves (331) are arranged on the second telescopic rod (34).

4. A tension adjusting device of a doubling machine according to claim 3, wherein: two ends of the first limiting long groove (331) can abut against the corresponding first limiting block (341).

5. The tension adjusting apparatus of a doubling machine according to claim 2, wherein: the tension sensor (37) is arranged on the outer side wall of the first telescopic pipe (33), a pulley (38) is further rotatably connected to the first telescopic pipe (33), and a transmission rope (39) in transmission connection with the pulley (38) is connected between the second telescopic pipe (34) and the tension sensor (37).

6. The tension adjusting apparatus of a doubling machine according to claim 1, wherein: the telescopic adjusting mechanism (4) comprises a second telescopic pipe (41), the first telescopic rod (42) is connected in the second telescopic pipe (41) in a sliding mode, and one end of the first telescopic rod (42) extends out of the second telescopic pipe (41); and a vacuum pump (44) for enabling the first telescopic rod (42) to retract into the second telescopic pipe (41) and an air compressor (45) for enabling the first telescopic rod (42) to extend out of the second telescopic pipe (41) are connected to the second telescopic pipe (41).

7. The tension adjusting apparatus of a doubling machine according to claim 6, wherein: the telescopic adjusting mechanism (4) further comprises a controller (9) electrically connected with the tension sensing piece (31); a first air duct (441) with a first electric valve (442) is connected between the vacuum pump (44) and the second telescopic tube (41), and a second air duct (451) with a second electric valve (452) is connected between the air compressor (45) and the second telescopic tube (41); the first electrically operated valve (442) and the second electrically operated valve (452) are both electrically connected to the controller (9).

8. The tension adjusting apparatus of a doubling machine according to claim 7, wherein: one end, far away from the second wire transmission wheel (43), of the second extension pipe (41) is provided with a pressure chamber (46) extending into the first extension rod (42), and one end, extending into the pressure chamber (46), of the first extension rod (42) is provided with a sealing gasket (47) which is tightly attached to the inner side wall of the pressure chamber (46) and can slide in the pressure chamber (46); the first air duct (441) and the second air duct (451) are both connected to one end of the pressure bin (46) far away from the second telescopic tube (41).

9. The tension adjusting apparatus of a doubling machine according to claim 8, wherein: a plurality of second limiting long grooves (411) axially arranged along the second telescopic pipe (41) are arranged in the second telescopic pipe (41), and a plurality of second limiting blocks (421) extending into the second limiting long grooves (411) and capable of sliding in the second limiting long grooves (411) are arranged on the first telescopic rod (42).

10. The tension adjusting apparatus of a doubling machine according to claim 9, wherein: two ends of the second limiting long groove (411) can be abutted against the corresponding second limiting block (421).