A stretching device for colored spinning

Abstract

The invention discloses a stretching device for colored spun yarn, comprising a positive pressure box and a stretching mechanism, wherein the stretching mechanism is placed inside the positive pressure box, the stretching mechanism comprises a drafting frame, an adjusting frame is arranged above one side of the drafting frame, a fixing frame is arranged below one side of the drafting frame, a wire drawing reel is arranged on the other side of the drafting frame, the drafting frame comprises a first front roller and a second front roller, the adjusting frame comprises a first middle roller, a first rear roller and a plurality of adjusting components, and the fixing frame comprises a second middle roller, a second rear roller and a cross plate; the technical key points are as follows: a stretching position is formed between an upper leather ring at a pressure roller and a lower leather ring at a cross plate, the magnitude of the friction force at the stretching position is controlled by the telescopic stroke of an electric cylinder, a sleeve, a telescopic rod and a spring form an automatic avoidance mechanism, which automatically avoids when the friction force is too large, the traction and stretching action of the stretching mechanism is performed in a positive pressure environment, and static electricity generated by friction of the yarn is eliminated by an electrostatic eliminator.

Description

Technical Field

[0001] The invention relates to the technical field of color spun yarn stretching, in particular to a color spun yarn stretching device. Background Art

[0002] The so-called color spinning is to dye the fiber into colored fiber first, and then mix two or more fibers of different colors fully and spin them into yarn with unique color mixing effect. Color spinning can achieve the hazy three-dimensional effect and texture that cannot be achieved by white dyeing. Color spinning is pollution-free to use and can also control the color difference to the greatest extent. Therefore, color spinning with soft and fashionable colors and flexible production of small batches and multiple varieties is increasingly used in mid-to-high-end clothing products. Color spinning adopts the new process of "dyeing first and spinning later", which shortens the production process of downstream processing enterprises, reduces production costs, and has higher added value. Compared with the traditional process of "spinning first and dyeing later", the performance of color spinning products is better than other textile products, and it has stronger market competitiveness and better market prospects.

[0003] The dyeing of colored spun yarn is carried out in a high temperature and high pressure environment. After dyeing, the colored spun yarn is prone to shrinkage due to the effect of high temperature and high pressure. If it is not stretched, its length and toughness will be reduced, affecting the sewing effect. When the existing stretching device stretches the colored spun yarn, it controls the speed of the front and rear rollers to achieve the purpose of traction and stretching. When the yarn is subjected to a large stretching force during the stretching process, the yarn will break.

[0004] During the stretching process of colored yarn, the yarn will carry static electricity due to friction, which will attract dust. Accidents such as yarn breakage, flying flowers, and yarn entanglement that reduce production efficiency and product quality often occur, causing textile production to be unable to proceed normally. Summary of the invention

[0005] 1. Technical problems solved:

[0006] In view of the shortcomings of the prior art, the present invention provides a stretching device for colored spun yarn, wherein a stretching position is formed between the upper leather ring at the pressure roller and the lower leather ring at the cross plate, and the magnitude of the friction force at the stretching position is controlled by the telescopic stroke of the electric cylinder. The sleeve, the telescopic rod and the spring form an automatic avoidance mechanism, which automatically avoids when the friction force is too large. The traction and stretching action of the stretching mechanism is performed under a positive pressure environment, and the static electricity generated by the friction of the yarn is eliminated by an electrostatic eliminator, thereby solving the technical problems mentioned in the background technology.

[0007] (II) Technical solution:

[0008] To achieve the above object, the present invention is implemented through the following technical solutions:

[0009] A stretching device for colored spun yarn, comprising a positive pressure box and a stretching mechanism, wherein the stretching mechanism is placed inside the positive pressure box, the stretching mechanism comprises a drafting frame, an adjusting frame is arranged above one side of the drafting frame, a fixing frame is arranged below one side of the drafting frame, a wire guide drum is arranged on the other side of the drafting frame, the drafting frame comprises a first front roller and a second front roller, and a driving position is formed between the first front roller and the second front roller, the adjusting frame comprises a first middle roller, a first rear roller and a plurality of adjustment components, and the first middle roller and the first rear roller are connected by an upper roller. The fixing frame comprises a second middle roller, a second rear roller and a cross plate, the second middle roller and the second rear roller are connected via a lower leather ring, a stretching position is formed between the upper leather ring and the lower leather ring, the adjusting assembly comprises an electric cylinder, one end of the electric cylinder is connected to a pressure sensor, the specific value of the friction force is converted by a pressure signal fed back by the pressure sensor, the pressure sensor is connected to a sleeve and a telescopic rod, one end of the telescopic rod is connected to a roller frame, a pressure roller is arranged on the roller frame, and the electric cylinder can drive the pressure roller at its end to move axially when working.

[0010] In a possible implementation, one end of the telescopic rod is slidably embedded in the sleeve and elastically connected to the sleeve via a spring. The roller frame is rotationally connected to the pressure roller, and the sleeve, the telescopic rod and the spring form an automatic avoidance mechanism.

[0011] In a possible implementation, the first middle roller and the first rear roller are rotationally connected to the frame of the adjustment frame, and the upper rubber ring is covered on the outside of the first middle roller and the first rear roller. When the upper rubber ring moves under the action of friction, it drives the first middle roller and the first rear roller to rotate relative to the frame of the adjustment frame.

[0012] In a possible implementation, the second middle roller and the second rear roller are rotationally connected to the frame of the fixed frame, and the lower leather ring is covered on the outside of the second middle roller and the second rear roller. When the lower leather ring moves under the action of friction, it drives the second middle roller and the second rear roller to rotate relative to the frame of the adjustment frame.

[0013] In a possible implementation, four groups of adjustment components are provided, and the four groups of adjustment components are all located between the first middle roller and the first rear roller, and the cross plate is located between the second middle roller and the second rear roller. The pressure rollers of the four groups of adjustment components are tightly attached to the inner side of the upper leather ring, and the cross plate is tightly attached to the inner side of the lower leather ring, and a stretching position is formed between the upper leather ring at the pressure roller and the lower leather ring at the cross plate.

[0014] In a possible implementation, a transmission box is provided on the outer side of the drafting frame body, one end of the transmission box is connected to the motor, and a gear assembly is provided inside the transmission box. When the motor is working, the first front roller and the second front roller are driven to rotate synchronously in opposite directions through the gear transmission inside the transmission box, and the rotational force is converted into a linear driving force, and the yarn is driven by the linear driving force.

[0015] In a possible implementation, the lead barrel is provided with a plurality of groups of lead holes, the plurality of groups of lead holes are evenly spaced along the axis direction of the lead barrel, and each group of lead holes is inlaid with an oxide ceramic ring.

[0016] In one possible implementation, the positive pressure box includes a box body and a bottom box, the bottom box is located at the bottom of the box body, and the stretching mechanism is placed in the box body, a yarn inlet is opened on one side of the box body, and a yarn outlet is opened on the other side of the box body, and an electrostatic eliminator is arranged inside the box body near the yarn outlet, and the static electricity generated by friction of the yarn is eliminated by the electrostatic eliminator before the yarn is discharged.

[0017] In a possible implementation, a fresh air component is provided on one side inside the bottom box, one end of the fresh air component is connected to the air supply pipe, one end of the air supply pipe is connected to the air distribution pipe, and multiple groups of air outlet pipes are provided on the air distribution pipe, and one end of the multiple groups of air outlet pipes extend into the box body.

[0018] In one possible implementation, an air inlet window is provided at one end of the fresh air component, a filter element and a blower are built into the fresh air component, and an air supply hood is provided at the other end of the fresh air component. One end of the air supply hood is fixedly connected to the air supply pipe. When the blower is working, fresh air is introduced, and the fresh air enters through the air inlet window, is filtered and dust-removed by the filter element, and is discharged through the air supply hood. The clean gas enters the air supply pipe, enters the air distribution pipe through the air supply pipe, and is finally discharged evenly through multiple groups of air outlet pipes of the air distribution pipe.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. A stretching position is formed between the upper leather ring at the pressure roller and the lower leather ring at the cross plate of the present invention. The magnitude of the friction force at the stretching position is controlled by the telescopic stroke of the electric cylinder. The drafting frame provides traction power for stretching the yarn. During the linear motion of the colored spun yarn, the friction force at the stretching position is overcome to achieve stretching. Since the friction force is constant, the stretching multiple of the colored spun yarn is stable. When the stretching multiple needs to be adjusted, it is only necessary to adjust the position of the pressure roller through the electric cylinder. The specific value of the friction force is converted by the pressure signal fed back by the pressure sensor.

[0021] 2. The sleeve, telescopic rod and spring of the present invention form an automatic avoidance mechanism. When the friction force is too large to pull the yarn, part of the external force will act on the spring to compress the spring, and the telescopic rod will drive the pressure roller to automatically rise, allowing the yarn to be pulled and stretched in a straight line, effectively preventing the yarn from breaking.

[0022] 3. A positive pressure environment is formed inside the positive pressure box of the present invention, and the traction and stretching action of the stretching mechanism is performed and completed in the positive pressure environment, which prevents dust in the outside air from entering the positive pressure box and adhering to the colored spun yarn. Before the yarn comes out, the static electricity generated by the friction of the yarn is eliminated by the static eliminator, which prevents dust from adhering to the surface of the yarn, and prevents accidents such as yarn breakage, flying flowers, yarn entanglement, etc. that reduce production efficiency and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0024] Figure 1 It is a schematic diagram of the structure of a side view of the stretching mechanism of the present invention;

[0025] Figure 2 Another side view schematic diagram of the stretching mechanism of the present invention;

[0026] Figure 3 It is a schematic diagram of the stretching of the colored spun yarn of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the regulating assembly of the present invention;

[0028] Figure 5 It is a schematic diagram of the structure of the lead barrel of the present invention;

[0029] Figure 6 It is a schematic diagram of the connection between the sleeve and the telescopic rod of the present invention;

[0030] Figure 7 It is a structural schematic diagram of the adjustment frame of the present invention;

[0031] Figure 8 It is a structural schematic diagram of the fixing frame of the present invention;

[0032] Fig. 9 It is a structural schematic diagram of the positive pressure box of the present invention;

[0033] Fig.10 It is a structural schematic diagram of the fresh air component of the present invention;

[0034] Fig.11 It is a schematic diagram of the structure of the static eliminator of the present invention.

[0035] In the figure: 1, positive pressure box; 2, stretching mechanism; 11, box body; 12, bottom box; 13, fresh air assembly; 14, air supply duct; 15, air distribution duct; 16, air outlet duct; 17, static eliminator; 111, yarn inlet; 112, yarn outlet; 131, air inlet window; 132, filter element; 133, air blower; 134, air supply cover; 21, drafting frame; 22, adjustment frame; 23, fixing frame; 24, wire guide; 211, first front roller; 212, second Front roller; 213, transmission box; 214, motor; 221, first middle roller; 222, first rear roller; 223, upper apron; 224, adjustment assembly; 231, second middle roller; 232, second rear roller; 233, lower apron; 234, cross plate; 2241, roller frame; 2242, pressure roller; 2243, electric cylinder; 2244, pressure sensor; 2245, sleeve; 2246, telescopic rod; 2247, spring; 241, lead hole. DETAILED DESCRIPTION

[0036] The embodiment of the present application provides a stretching device for colored spun yarn, wherein a stretching position is formed between the upper leather ring at the pressure roller and the lower leather ring at the cross plate, and the magnitude of the friction force at the stretching position is controlled by the telescopic stroke of the electric cylinder. The sleeve, the telescopic rod and the spring form an automatic avoidance mechanism, which automatically avoids when the friction force is too large. The traction and stretching action of the stretching mechanism is performed under a positive pressure environment, and the static electricity generated by the friction of the yarn is eliminated by an electrostatic eliminator, thereby solving the technical problems mentioned in the background technology.

[0037] The technical solution in the embodiment of the present application is to solve the problems of the above-mentioned background technology, and the overall idea is as follows: Embodiment 1

[0038] See also Figure 1-11The present invention provides a technical solution: a stretching device for colored spun yarn, comprising a positive pressure box 1 and a stretching mechanism 2, the stretching mechanism 2 is placed inside the positive pressure box 1, the stretching mechanism 2 comprises a drafting frame 21, an adjusting frame 22 is arranged above one side of the drafting frame 21, a fixing frame 23 is arranged below one side of the drafting frame 21, a wire bobbin 24 is arranged on the other side of the drafting frame 21, the drafting frame 21 comprises a first front roller 211 and a second front roller 212, and a driving position is formed between the first front roller 211 and the second front roller 212, the adjusting frame 22 comprises a first middle roller 221, a first rear roller 222 and a plurality of adjusting components 224, the first middle roller 221 is provided with a first adjusting frame 222, and a plurality of adjusting components 224 are provided. The roller 221 is connected to the first rear roller 222 via an upper leather ring 223, the fixed frame 23 includes a second middle roller 231, a second rear roller 232 and a cross plate 234, the second middle roller 231 and the second rear roller 232 are connected via a lower leather ring 233, a stretching position is formed between the upper leather ring 223 and the lower leather ring 233, the adjustment component 224 includes an electric cylinder 2243, one end of the electric cylinder 2243 is connected to a pressure sensor 2244, the pressure sensor 2244 is connected to a sleeve 2245 and a telescopic rod 2246, one end of the telescopic rod 2246 is connected to a roller frame 2241, and a pressure roller 2242 is arranged on the roller frame 2241.

[0039] Among them, a positive pressure environment is formed inside the positive pressure box 1, and the stretching mechanism 2 is placed inside the positive pressure box 1 to pull and stretch the colored yarn, so that the pulling and stretching action is carried out and completed in the positive pressure environment, preventing dust in the outside air from entering the positive pressure box 1 and adhering to the colored yarn, ensuring the cleanliness of the pulling and stretching environment, and thus improving the stretching quality of the colored yarn.

[0040] Among them, the first front roller 211 and the second front roller 212 of the drafting frame 21 have opposite rotation directions, and a driving position is formed between the first front roller 211 and the second front roller 212. The yarn to be stretched passes through the driving position, and the yarn is clamped by the first front roller 211 and the second front roller 212. When the first front roller 211 and the second front roller 212 rotate under the drive of the motor 214, the rotational force is converted into a linear driving force, and the yarn is driven by the linear driving force to provide traction power for stretching the yarn.

[0041] Among them, a stretching position is formed between the upper apron 223 of the adjustment frame 22 and the lower apron 233 of the fixing frame 23. The upper apron 223 and the lower apron 233 are both made of rubber material with a certain elasticity. The upper apron 223 and the lower apron 233 apply a uniformly distributed vertical pressure to the colored yarn. There is a certain friction force between the upper apron 223, the colored yarn and the lower apron 233. The upper apron 223 and the lower apron 233 are both driven by friction force. The first middle roller 221, the first rear roller 222, the second middle roller 231, and the second rear roller 232 are all driven by friction force to drive the aprons, and then driven by the aprons.

[0042] When the yarn moves in a straight line under the drive of the drafting frame 21, the rear yarn is subjected to the friction force, and the yarn is stretched in the process of overcoming the friction force. By adjusting the friction force between the upper apron 223 and the lower apron 233, the traction stretching amount of the colored yarn is adjusted accordingly.

[0043] Among them, when the electric cylinder 2243 is working, it can drive the pressure roller 2242 at its end to move axially. When the pressure roller 2242 moves downward, an external force is applied to the upper rubber ring 223, causing the upper rubber ring 223 to produce corresponding elastic deformation, thereby increasing the friction force at the stretching position and adjusting the stretching amount of the colored yarn. The size of the friction force at the stretching position is controlled by the telescopic stroke of the electric cylinder 2243, and the specific value of the friction force is converted by the pressure signal fed back by the pressure sensor 2244.

[0044] In some examples, one end of the telescopic rod 2246 is slidably embedded in the sleeve 2245 and elastically connected to the sleeve 2245 through a spring 2247. The roller frame 2241 and the pressure roller 2242 are rotationally connected, and the external force to overcome the elastic force of the spring 2247 is less than the maximum tension that the yarn can withstand.

[0045] Among them, the sleeve 2245, the telescopic rod 2246 and the spring 2247 form an automatic avoidance mechanism. When the friction force is too large to pull the yarn, in order to avoid the yarn breaking, part of the external force will act on the spring 2247 to compress the spring 2247. At this time, the telescopic rod 2246 is retracted into the sleeve 2245 for a distance, and the telescopic rod 2246 drives the pressure roller 2242 to automatically rise, allowing the yarn to be pulled and stretched in a straight line, effectively preventing the yarn from breaking.

[0046] In some examples, the first middle roller 221 and the first rear roller 222 are rotatably connected to the frame body of the adjustment frame 22 , and the upper rubber ring 223 covers the outside of the first middle roller 221 and the first rear roller 222 .

[0047] When the upper rubber ring 223 moves under the action of friction force, it drives the first middle roller 221 and the first rear roller 222 to rotate relative to the frame body of the adjustment frame 22, and the first middle roller 221 and the first rear roller 222 are driven components.

[0048] In some examples, the second middle roller 231 and the second rear roller 232 are rotatably connected to the frame of the fixed frame 23 , and the lower leather ring 233 covers the outside of the second middle roller 231 and the second rear roller 232 .

[0049] When the lower leather ring 233 moves under the action of friction force, it drives the second middle roller 231 and the second rear roller 232 to rotate relative to the frame body of the adjustment frame 22, and the second middle roller 231 and the second rear roller 232 are driven components.

[0050] In some examples, four groups of adjustment components 224 are provided, and the four groups of adjustment components 224 are all located between the first middle roller 221 and the first rear roller 222, and the cross plate 234 is located between the second middle roller 231 and the second rear roller 232. The pressure rollers 2242 of the four groups of adjustment components 224 are tightly attached to the inner side of the upper leather ring 223, and the cross plate 234 is tightly attached to the inner side of the lower leather ring 233. A stretching position is formed between the upper leather ring 223 at the pressure roller 2242 and the lower leather ring 233 at the cross plate 234. The stretching position has a certain friction force. During the linear motion of the colored spun yarn, the friction force of the stretching position is overcome to achieve stretching. Since the friction force is constant, the stretching multiple of the colored spun yarn is also constant during the stretching process.

[0051] In some examples, a transmission box 213 is disposed on the outer side of the drawing frame 21 , one end of the transmission box 213 is connected to the motor 214 , and a gear assembly is disposed inside the transmission box 213 .

[0052] Among them, two groups of gears are arranged inside the transmission box 213, one group of gears is connected to the first front roller 211, and the other group of gears is connected to the second front roller 212. The two groups of gears are meshed and transmitted, and one group of gears is connected to the output shaft of the motor 214. When the motor 214 is working, the gear transmission inside the transmission box 213 drives the first front roller 211 and the second front roller 212 to rotate synchronously in the opposite direction, and the rotational force is converted into a linear driving force, and the yarn is driven by the linear driving force.

[0053] In some examples, a plurality of groups of wire holes 241 are provided on the wire guide tube 24, and the plurality of groups of wire holes 241 are evenly spaced along the axis direction of the wire guide tube 24. Each group of wire holes 241 is inlaid with an oxide ceramic ring, which is smooth and wear-resistant, thereby ensuring that the yarn will not be damaged or broken during the wire guide process.

[0054] By adopting the above technical solution:

[0055] A stretching position is formed between the upper apron 223 at the pressure roller 2242 and the lower apron 233 at the cross plate 234. The magnitude of the friction force at the stretching position is controlled by the telescopic stroke of the electric cylinder 2243 of the adjustment component 224. The drafting frame 21 provides traction power for stretching the yarn. During the linear motion of the colored spun yarn, the friction force at the stretching position is overcome to achieve stretching. Since the friction force is constant, the stretching multiple of the colored spun yarn is stable. When the stretching multiple needs to be adjusted, it is only necessary to adjust the position of the pressure roller 2242 through the electric cylinder 2243. The specific value of the friction force is converted by the pressure signal fed back by the pressure sensor 2244.

[0056] The sleeve 2245, the telescopic rod 2246 and the spring 2247 form an automatic avoidance mechanism. When the friction force is too large to pull the yarn, part of the external force will act on the spring 2247 to compress the spring 2247. The telescopic rod 2246 drives the pressure roller 2242 to automatically rise, allowing the yarn to be pulled and stretched in a straight line, effectively preventing the yarn from breaking. Embodiment 2

[0057] Based on Example 1, this example introduces the specific structure of a positive pressure box 1 in a color spun yarn stretching device. The positive pressure box 1 includes a box body 11 and a bottom box 12. The bottom box 12 is located at the bottom of the box body 11, and the stretching mechanism 2 is placed in the box body 11. A yarn inlet 111 is opened on one side of the box body 11, and a yarn outlet 112 is opened on the other side of the box body 11. An electrostatic eliminator 17 is arranged inside the box body 11 near the yarn outlet 112.

[0058] The colored spun yarn enters through the yarn inlet 111 of the box 11, passes through the stretching position and the driving position, and then exits through the yarn outlet 112 of the box 11, and is finally wound up by the winding mechanism;

[0059] The interior of the box body 11 of the positive pressure box 1 is a positive pressure environment, and clean air from the outside continuously enters the positive pressure chamber. Before the yarn comes out, it passes through the static elimination area at the static eliminator 17. The static eliminator 17 applies a high voltage to the electrode, and corona discharge occurs to produce a large number of positive and negative ions. A large number of positive and negative ions are blown to the surface of multiple strands of yarn under the action of airflow to neutralize static electricity, eliminate static electricity generated by friction of the yarn, prevent dust from adhering to the surface of the yarn, and prevent accidents such as broken ends, flying flowers, yarn entanglement, etc. that reduce production efficiency and product quality.

[0060] In some examples, a fresh air component 13 is provided on one side inside the bottom box 12, and the fresh air component 13 is used to supply air. One end of the fresh air component 13 is connected to an air supply pipe 14, and one end of the air supply pipe 14 is connected to an air distribution pipe 15. A plurality of groups of air outlet pipes 16 are provided on the air distribution pipe 15, and one end of the plurality of groups of air outlet pipes 16 extends into the box body 11.

[0061] In some examples, an air inlet window 131 is provided at one end of the fresh air component 13, a filter element 132 and a blower 133 are built into the fresh air component 13, and an air supply hood 134 is provided at the other end of the fresh air component 13, and one end of the air supply hood 134 is fixedly connected to the air supply pipe 14.

[0062] Among them, when the blower 133 is working, fresh air is introduced, the fresh air enters through the air inlet window 131, is filtered and dust-removed by the filter element 132, and is discharged through the air supply hood 134. The clean gas enters the air supply pipe 14, enters the air distribution pipe 15 through the air supply pipe 14, and is finally evenly discharged through the multiple groups of air outlet pipes 16 of the air distribution pipe 15, and is discharged to the inside of the box body 11 of the positive pressure box 1, thereby realizing positive pressure air supply.

[0063] By adopting the above technical solution:

[0064] A positive pressure environment is formed inside the positive pressure box 1, and the traction and stretching action of the stretching mechanism 2 is performed and completed in the positive pressure environment to prevent dust in the outside air from entering the positive pressure box 1 and adhering to the colored spun yarn. Before the yarn comes out, the static electricity generated by friction of the yarn is eliminated by the static eliminator 17 to prevent dust from adhering to the surface of the yarn, and to prevent accidents such as yarn breakage, flying flowers, yarn entanglement, etc. that reduce production efficiency and product quality.

[0065] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A stretching device for colored spun yarn, comprising a positive pressure box (1) and a stretching mechanism (2), characterized in that: The stretching mechanism (2) is placed inside the positive pressure box (1), and comprises a stretching frame (21). An adjusting frame (22) is arranged above one side of the stretching frame (21), a fixing frame (23) is arranged below one side of the stretching frame (21), and a wire guide barrel (24) is arranged on the other side of the stretching frame (21). The stretching frame (21) comprises a first front roller (211) and a second front roller (212), and a driving position is formed between the first front roller (211) and the second front roller (212). The adjusting frame (22) comprises a first middle roller (221), a first rear roller (222), and a plurality of adjusting components (224). The first middle roller (221) and the first rear roller (222) are connected by an upper roller. The fixing frame (23) comprises a second middle roller (231), a second rear roller (232) and a transverse plate (234); the second middle roller (231) and the second rear roller (232) are connected via a lower leather ring (233); a stretching position is formed between the upper leather ring (223) and the lower leather ring (233); the adjusting component (224) comprises an electric cylinder (2243); one end of the electric cylinder (2243) is connected to a pressure sensor (2244); the pressure sensor (2244) is connected to a sleeve (2245) and a telescopic rod (2246); one end of the telescopic rod (2246) is connected to a roller frame (2241); and a pressure roller (2242) is provided on the roller frame (2241); One end of the telescopic rod (2246) is slidably embedded in the sleeve (2245) and is elastically connected to the sleeve (2245) via a spring (2247); the roller frame (2241) is rotationally connected to the pressure roller (2242).

2. A stretching device for colored spun yarn according to claim 1, characterized in that: The first middle roller (221) and the first rear roller (222) are both rotatably connected to the frame body of the adjustment frame (22), and the upper rubber ring (223) covers the outside of the first middle roller (221) and the first rear roller (222).

3. A stretching device for colored spun yarn according to claim 1, characterized in that: The second middle roller (231) and the second rear roller (232) are both rotatably connected to the frame body of the fixed frame (23), and the lower leather ring (233) covers the outside of the second middle roller (231) and the second rear roller (232).

4. A stretching device for colored spun yarn according to claim 1, characterized in that: Four groups of the adjustment components (224) are provided, and the four groups of the adjustment components (224) are all located between the first middle roller (221) and the first rear roller (222), and the transverse plate (234) is located between the second middle roller (231) and the second rear roller (232).

5. A stretching device for colored spun yarn according to claim 1, characterized in that: A transmission box (213) is arranged on the outer side of the frame body of the drafting frame (21), one end of the transmission box (213) is connected to the motor (214), and a gear assembly is arranged inside the transmission box (213).

6. A stretching device for colored spun yarn according to claim 1, characterized in that: The lead wire barrel (24) is provided with a plurality of groups of lead wire holes (241), and the plurality of groups of lead wire holes (241) are evenly spaced along the axial direction of the lead wire barrel (24).

7. A stretching device for colored spun yarn according to claim 1, characterized in that: The positive pressure box (1) comprises a box body (11) and a bottom box (12), wherein the bottom box (12) is located at the bottom of the box body (11), and the stretching mechanism (2) is placed inside the box body (11). A yarn inlet (111) is provided on one side of the box body (11), and a yarn outlet (112) is provided on the other side of the box body (11). An electrostatic eliminator (17) is provided inside the box body (11) near the yarn outlet (112).

8. A stretching device for colored spun yarn according to claim 7, characterized in that: A fresh air component (13) is provided on one side inside the bottom box (12); one end of the fresh air component (13) is connected to an air supply pipe (14); one end of the air supply pipe (14) is connected to an air distribution pipe (15); a plurality of groups of air outlet pipes (16) are provided on the air distribution pipe (15); one end of each of the plurality of groups of air outlet pipes (16) extends into the box body (11).

9. A stretching device for colored spun yarn according to claim 8, characterized in that: An air inlet window (131) is provided at one end of the fresh air component (13), a filter element (132) and an air blower (133) are built into the fresh air component (13), an air supply cover (134) is provided at the other end of the fresh air component (13), and one end of the air supply cover (134) is fixedly connected to the air supply pipe (14).

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