Dyeing spool with dyeing liquid recovery function

By designing a dyeing yarn bobbin with a dyeing solution recovery function, and utilizing components such as an electronically controlled valve, a water pump, and a filter cartridge, the problem of low dyeing solution recovery efficiency was solved, achieving efficient dyeing solution recovery and uniform dyeing of the yarn bobbin.

CN223522809UActive Publication Date: 2025-11-07SHANDONG GAOMIAN INTELLIGENT FIBER DYEING TECH CO LTD
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Patent Information

Application Number
CN202422985042.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-04
Publication Date
2025-11-07
Estimated Expiration
2034-12-04

AI Technical Summary

Technical Problem

When recycling dyeing solution from existing dyeing yarn bobbins, impurities such as fibers and lint are present, resulting in low recycling efficiency and requiring additional filtration processes, which affects reuse efficiency.

Method used

A dyeing yarn spool with dyeing solution recovery function has been designed, including a dyeing solution recovery mechanism, a filtration mechanism, a dyeing solution conveying mechanism and a lifting mechanism. Through the cooperation of components such as an electric control valve, a water pump, a filter cylinder and a rotary motor, the dyeing solution can be recycled and filtered, and multiple yarn spools can be dyed at the same time.

Benefits of technology

It achieves efficient recovery and filtration of dyeing solution, saving additional filtration steps and labor costs, and improving dyeing efficiency and uniformity.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a dyeing spool with a dyeing liquid recovery function, which relates to the technical field of dyeing spools and comprises a dyeing spool soaking box, a dyeing liquid recovery mechanism is arranged on the right side of the dyeing spool soaking box, and a dyeing liquid conveying mechanism is arranged on the left side of the dyeing spool soaking box. A lifting mechanism is arranged on the rear side of the dyeing spool soaking box, an inclined plate is fixedly mounted in the middle of an inner cavity of the dyeing spool soaking box, and two threaded mounting holes penetrating through the inner cavity of the dyeing spool soaking box are formed in the right side of the dyeing spool soaking box. According to the utility model, the dyeing spool soaking box, the electric control valve, the connecting hose, the filtering mechanism and the dyeing liquid conveying mechanism are matched with one another, so that the dyeing liquid for dyeing the dyeing spool can be recycled, meanwhile, the dyeing liquid can be filtered before being recycled, filtered substances can be conveniently cleaned, and the working efficiency is improved. And the steps of extracting the staining solution and additionally filtering are saved, and the additional labor cost is reduced.
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Description

TECHNICAL FIELD

[0001] The utility model relates to dyeing yarn drum technical field, specifically in dyeing yarn drum with dyeing liquid recycling function. BACKGROUND

[0002] Dyeing yarn drum is mostly adopted cylindrical cylinder, and a plurality of penetration holes are formed on the cylindrical cylinder, and when dyeing, the full cotton yarn or blank shaft is placed in the dyeing cylinder filled with dyeing liquid, and the yarn is soaked in the dyeing liquid to have the color of the dyeing liquid.

[0003] Because the remaining dyeing liquid needs to be recycled after the full cotton yarn or blank shaft is immersed in the dyeing liquid by using the existing dyeing yarn drum, the recycling process only adopts the form of pump body recycling, but a large amount of fiber cotton and other impurities exist in the dyeing liquid after a long time of soaking a large amount of full cotton yarn or blank shaft, and the dyeing liquid cannot be used again after direct recycling, and the recycling and reuse efficiency is slow. SUMMARY

[0004] The utility model provides a dyeing yarn drum with dyeing liquid recycling function to solve the problems in the above background.

[0005] To solve the above technical problems, the technical scheme adopted by the utility model is:

[0006] A dyeing yarn drum with dyeing liquid recycling function, comprising a dyeing yarn drum soaking box, a dyeing liquid recycling mechanism is arranged on the right side of the dyeing yarn drum soaking box, a dyeing liquid conveying mechanism is arranged on the left side of the dyeing yarn drum soaking box, a lifting mechanism is arranged on the rear side of the dyeing yarn drum soaking box, an inclined plate is fixedly installed in the middle of the inner cavity of the dyeing yarn drum soaking box, two threaded mounting holes penetrating the inner cavity are formed on the right side of the dyeing yarn drum soaking box, both threaded mounting holes are located above the inclined plate, the dyeing liquid recycling mechanism comprises two electric control valves, the right side output ends of the two electric control valves are mutually penetrated with the inner cavity of the dyeing yarn drum soaking box below, the left side input ends of the two electric control valves are both fixedly connected with a connecting hose, and the input ends of the two connecting hoses are both connected with a filtering mechanism.

[0007] The further improvement of the technical scheme of the utility model is that the filtering mechanism comprises a threaded ring one, the threaded ring one is connected with the inner ring of the threaded mounting hole in a threaded mode, a rotary dismounting handle is fixedly connected with the right side of the threaded ring one, a threaded ring two is fixedly connected with the right side of the rotary dismounting handle, a filter cartridge is threadedly installed in the inner ring of the threaded ring two, a metal connecting pipe is threadedly installed on the outer wall of the threaded ring two, and the right end of the metal connecting pipe is fixedly connected with the input end of the connecting hose.

[0008] The further improvement in the technical scheme of the utility model lies in that the dyeing liquid conveying mechanism comprises a water pump, the water pump is fixedly installed at the left side of the dyeing yarn cylinder soaking box, a liquid suction pipe is fixedly connected to the input end of the water pump, the input end of the liquid suction pipe is fixedly connected with the bottom of the inner cavity of the dyeing yarn cylinder soaking box, a liquid delivery pipe is fixedly connected to the top output end of the water pump, a liquid outlet box is fixedly installed above the left side of the dyeing yarn cylinder soaking box, the top end of the liquid delivery pipe is fixedly connected with the inner cavity of the liquid outlet box, a plurality of liquid spray nozzles are fixedly connected to the right side of the liquid outlet box, and the right ends of the plurality of liquid spray nozzles all penetrate into the inner cavity of the dyeing yarn cylinder soaking box.

[0009] The further improvement in the technical scheme of the utility model lies in that the lifting mechanism comprises a lifting box, the lifting box is fixedly installed at the rear side of the dyeing yarn cylinder soaking box, a sliding groove is formed at the rear side of the lifting box, a lifting motor is fixedly installed at the bottom of the lifting box, the output shaft of the lifting motor penetrates into the inner cavity of the sliding groove and is fixedly installed with a lifting threaded rod, a C-shaped connecting plate is threadedly installed on the outer wall of the lifting threaded rod, a sealing cover is fixedly installed at the front end of the horizontal upper portion of the C-shaped connecting plate, and the sealing cover is clamped with the top of the dyeing yarn cylinder soaking box after descending.

[0010] The further improvement in the technical scheme of the utility model lies in that a rotary motor is fixedly installed at the top center of the sealing cover, the output shaft of the rotary motor penetrates into the lower portion of the sealing cover and is provided with a dyeing yarn cylinder positioning mechanism.

[0011] The further improvement in the technical scheme of the utility model lies in that the dyeing yarn cylinder positioning mechanism comprises a hanging disc, the top center of the hanging disc is fixedly connected with the bottom end of a hanging rod, a plurality of insertion rods are fixedly installed at the top annular array of the hanging disc, threaded holes are formed at the top of the plurality of insertion rods, limit screws are threadedly installed in the inner circle of the threaded holes, and yarn cylinder limiting discs are fixedly installed at the top of the limit screws.

[0012] Due to the adoption of the above technical scheme, the utility model has the following technical progress compared with the prior art:

[0013] 1、The utility model provides a dyeing yarn cylinder with dyeing liquid recycling function, through the mutual cooperation between the dyeing yarn cylinder soaking box, the electric control valve, the connecting hose, the filtering mechanism and the dyeing liquid conveying mechanism, the dyeing liquid used for dyeing the dyeing yarn cylinder can be recycled, the filtering treatment can be carried out before recycling, the filtering material can be conveniently cleaned, the step of additional filtering of the dyeing liquid is saved, and the labor cost additionally paid is saved.

[0014] 2. The utility model provides a dyeing yarn cylinder with dyeing liquid recycling function, through the mutual cooperation between the lifting box, sealing cover, rotating electrical machine, boom, dyeing yarn cylinder positioning mechanism, so that multiple dyeing yarn cylinders can carry out dip dyeing treatment with dyeing liquid simultaneously, improve dyeing efficiency, utilize the rotation function to improve dip dyeing effect simultaneously. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the whole schematic view of the utility model structure;

[0016] Figure 2 It is the dyeing liquid recycling mechanism and dyeing liquid delivery mechanism schematic view of the utility model structure;

[0017] Figure 3 It is the filter mechanism schematic view of the utility model structure;

[0018] Figure 4 It is the lifting mechanism schematic view of the utility model structure;

[0019] Figure 5 It is the dyeing yarn cylinder positioning mechanism schematic view of the utility model structure.

[0020] In the drawing: 1, dyeing yarn cylinder soaking tank;11, inclined plate;12, threaded mounting hole;2, dyeing liquid recycling mechanism;21, electric control valve;22, connecting hose;23, filter mechanism;231, threaded ring one;232, rotation dismounting handle;233, threaded ring two;234, filter cylinder;235, metal connecting pipe;3, dyeing liquid delivery mechanism;31, water pump;32, liquid suction pipe;33, liquid outlet box;34, liquid delivery pipe;35, liquid spray nozzle;4, lifting mechanism;41, lifting box;42, sliding slot;43, lifting motor;44, lifting threaded rod;45, C type connecting plate;46, sealing cover;47, rotating electrical machine;48, boom;49, dyeing yarn cylinder positioning mechanism;491, hanging disc;492, insertion rod;493, threaded hole;494, limit screw;495, yarn cylinder limiting disc. DETAILED DESCRIPTION

[0021] In order to make the technical means, creation features, purposes and effects of the utility model easy to understand, the following further elaborates the utility model in combination with specific implementation manners.

[0022] For example, Figure 1 , Figure 2As shown in the utility model provides a kind of dyeing yarn drum with dyeing liquid recycling function, including dyeing yarn drum soaking tank 1, the right side of dyeing yarn drum soaking tank 1 is provided with dyeing liquid recycling mechanism 2, the left side of dyeing yarn drum soaking tank 1 is provided with dyeing liquid conveying mechanism 3, the rear side of dyeing yarn drum soaking tank 1 is provided with lifting mechanism 4, the inner cavity middle part of dyeing yarn drum soaking tank 1 is fixedly installed with inclined plate 11, the right side of dyeing yarn drum soaking tank 1 is provided with two threaded mounting holes 12 through its inner cavity, two threaded mounting holes 12 are all located above inclined plate 11, dyeing liquid recycling mechanism 2 includes two electric control valves 21, the right side output end of two electric control valves 21 and the inner cavity below of dyeing yarn drum soaking tank 1 are mutually through, the left side input end of two electric control valves 21 is all fixedly connected with connecting hose 22, the input end of two connecting hoses 22 is all connected with filter mechanism 23, dyeing liquid conveying mechanism 3 includes water pump 31, water pump 31 is fixedly installed at the left side of dyeing yarn drum soaking tank 1, the input end of water pump 31 is fixedly connected with liquid suction pipe 32, the input end of liquid suction pipe 32 and the inner cavity bottom of dyeing yarn drum soaking tank 1 are fixedly connected with, the top output end of water pump 31 is fixedly connected with liquid delivery pipe 34, the left side upper side of dyeing yarn drum soaking tank 1 is fixedly installed with liquid outlet box 33, the top end of liquid delivery pipe 34 and the inner cavity of liquid outlet box 33 are fixedly connected with, the right side of liquid outlet box 33 is fixedly connected with several liquid injection nozzles 35, and the right end of several liquid injection nozzles 35 is all through to the inner cavity of dyeing yarn drum soaking tank 1;

[0023] When using, by pouring into the inner cavity of dyeing yarn drum soaking tank 1 with appropriate dyeing liquid, then when soaking, the dyeing liquid containing impurities will be uniformly flowed to threaded mounting hole 12 using inclined plate 11, and after filtering using filter mechanism 23, it enters the inner cavity below inclined plate 11 of dyeing yarn drum soaking tank 1 using connecting hose 22 and electric control valve 21 in the opening state, then by starting water pump 31, the clean dyeing liquid below inclined plate 11 is pumped out using liquid suction pipe 32, and is injected into the inner cavity of liquid outlet box 33 using liquid delivery pipe 34, and is re-injected above inclined plate 11 in the inner cavity of dyeing yarn drum soaking tank 1 through several liquid injection nozzles 35 through the inner cavity of dyeing yarn drum soaking tank 1, to form a recycling use.

[0024] As shown in the utility model, Figure 3 Filter mechanism 23 includes threaded ring one 231, threaded ring one 231 is connected with the inner circle of threaded mounting hole 12, the right side of threaded ring one 231 is fixedly connected with rotary dismounting handle 232, the right side of rotary dismounting handle 232 is fixedly connected with threaded ring two 233, filter cartridge 234 is screw-mounted on the inner circle of threaded ring two 233, metal connecting pipe 235 is screw-mounted on the outer wall of threaded ring two 233, the right end of metal connecting pipe 235 is fixedly connected with the input end of connecting hose 22;

[0025] The dyeing solution passing through the filtration mechanism 23 will first pass through the filter cylinder 234 for filtration. Only then will the clean dyeing solution flow into the connecting hose 22 through the metal connecting pipe 235. The filter cylinder 234 is made of stainless steel to prevent rust. When it is necessary to clean the filter material in the filter cylinder 234, stop the water pump 31 and wait for the dyeing solution above the inclined plate 11 in the inner cavity of the dyeing yarn tube soaking tank 1 to completely flow into the area below the inclined plate 11. Then, close the electric control valve 21 to prevent the clean dyeing solution at the bottom of the inner cavity of the dyeing yarn tube soaking tank 1 from flowing out. Then, rotate the rotary disassembly handle 232 to rotate and remove the threaded ring 231. Then, while holding the metal connecting pipe 235, rotate the rotary disassembly handle 232 to rotate and separate the threaded ring 233 from the metal connecting pipe 235, thus exposing the filter cylinder 234. Then, directly rotate the filter cylinder 234 to remove it from the inner ring of the threaded ring 233 and directly clean its inner cavity.

[0026] like Figure 4 , Figure 5 As shown, the lifting mechanism 4 includes a lifting box 41, which is fixedly installed on the rear side of the dyeing yarn bobbin soaking tank 1. A slide groove 42 is provided on the rear side of the lifting box 41. A lifting motor 43 is fixedly installed at the bottom of the lifting box 41. The output shaft of the lifting motor 43 passes through the inner cavity of the slide groove 42 and is fixedly installed with a lifting threaded rod 44. A C-shaped connecting plate 45 is threaded onto the outer wall of the lifting threaded rod 44. A sealing cover 46 is fixedly installed at the front end of the C-shaped connecting plate 45 at a horizontal position above it. After the sealing cover 46 is lowered, it engages with the top of the dyeing yarn bobbin soaking tank 1. The top of the sealing cover 46... A rotary motor 47 is fixedly installed at the center of the part. The output shaft of the rotary motor 47 passes through to the bottom of the sealing cover 46 and is provided with a dyeing yarn tube positioning mechanism 49. The dyeing yarn tube positioning mechanism 49 includes a hanging plate 491. The top center of the hanging plate 491 is fixedly connected to the bottom end of the hanging rod 48. Several insert rods 492 are fixedly installed in a ring array on the top of the hanging plate 491. Each insert rod 492 has a threaded hole 493 on its top. A limit screw 494 is installed in the inner ring thread of the threaded hole 493. A yarn tube limiting plate 495 is fixedly installed on the top of the limit screw 494.

[0027] When installing the yarn cylinder, only need to start the lifting motor 43 at the bottom of the lifting box 41 to drive the lifting threaded rod 44 in the sliding groove 42 to rotate, so that the C-shaped connecting plate 45 threaded with the lifting threaded rod 44 rises until the sealing cover 46 drives the hanging plate 491 to rise by the hanging rod 48, then the yarn cylinder limiting disc 495 at the top of the insertion rod 492 is rotated to drive the limiting screw 494 to rotate and separate from the threaded hole 493, and the yarn cylinder is sleeved on the insertion rod 492, then the yarn cylinder limiting disc 495 is installed back on the insertion rod 492 to limit the yarn cylinder, then the lifting motor 43 output shaft is reversed to make the sealing cover 46 drive the hanging plate 491 to descend until the sealing cover 46 completely seals the top of the dyeing yarn cylinder soaking box 1 to prevent foreign matter from entering, so that the yarn cylinder on the hanging plate 491 is completely soaked in the dyeing liquid in the inner cavity of the dyeing yarn cylinder soaking box 1, and the rotating motor 47 is started to make the fixed yarn cylinder rotate in the dyeing liquid to make it more evenly contact with the dyeing liquid, and the dyeing effect is better.

[0028] The working principle of the dyeing yarn cylinder with dyeing liquid recycling function will be described below.

[0029] As Figures 1-5As shown, when in use, the dyeing yarn cylinder immersion tank 1 is filled with an appropriate amount of dyeing liquid through the inner cavity, and then when immersed, the impurity-containing dyeing liquid flows uniformly to the threaded mounting hole 12 through the inclined plate 11, and after being filtered by the filtering mechanism 23, it enters the inner cavity of the dyeing yarn cylinder immersion tank 1 below the inclined plate 11 through the connecting hose 22 and the open-state electric control valve 21. Subsequently, by starting the water pump 31, the clean dyeing liquid below the inclined plate 11 is pumped out through the liquid suction pipe 32, and injected into the inner cavity of the liquid outlet box 33 through the liquid delivery pipe 34. Through a plurality of liquid injection nozzles 35 penetrating into the inner cavity of the dyeing yarn cylinder immersion tank 1, the clean dyeing liquid is re-injected into the inner cavity of the dyeing yarn cylinder immersion tank 1 above the inclined plate 11, forming a recycling use. At the same time, the dyeing liquid passing through the filtering mechanism 23 will first pass through the filter cylinder 234 for filtering, and then the clean dyeing liquid will flow into the connecting hose 22 through the metal connecting pipe 235. The filter cylinder 234 is made of stainless steel material, which can prevent rust. When the filter material in the filter cylinder 234 needs to be cleaned, stop the water pump 31, and wait for the dyeing liquid in the inner cavity of the dyeing yarn cylinder immersion tank 1 above the inclined plate 11 to flow completely into the inner cavity below the inclined plate 11. Then, close the electric control valve 21 to prevent the clean dyeing liquid at the bottom of the inner cavity of the dyeing yarn cylinder immersion tank 1 from flowing out. Then, rotate the rotating disassembly handle 232 to rotate and dismount the threaded ring one 231. Hold the metal connecting pipe 235 and rotate the rotating disassembly handle 232 to separate the threaded ring two 233 from the metal connecting pipe 235. Then, expose the filter cylinder 234, and directly rotate the filter cylinder 234 to dismount it from the inner circle of the threaded ring two 233, and clean the inner cavity. When installing the yarn cylinder, start the lifting motor 43 at the bottom of the lifting box 41 to rotate the lifting threaded rod 44 in the sliding groove 42, so that the C-shaped connecting plate 45 connected with the lifting threaded rod 44 rises until the sealing cover 46 lifts the hanging disc 491 through the hanger 48, and then rotate the yarn cylinder limiting disc 495 on the top of the insertion rod 492 to separate the limiting screw 494 from the threaded hole 493, and put the yarn cylinder on the insertion rod 492, and then reverse the yarn cylinder limiting disc 495 to install it back on the top of the insertion rod 492 to limit the yarn cylinder. After all the yarn cylinders are installed, start the lifting motor 43 output shaft in reverse to lower the sealing cover 46 and the hanging disc 491 until the sealing cover 46 completely seals the top of the dyeing yarn cylinder immersion tank 1 to prevent foreign matter from entering, and the yarn cylinders on the hanging disc 491 are completely immersed in the dyeing liquid in the inner cavity of the dyeing yarn cylinder immersion tank 1. At the same time, start the rotating motor 47 to rotate the fixed yarn cylinder in the dyeing liquid, so that it is more evenly contacted with the dyeing liquid, and the dyeing effect is better.

[0030] The utility model is described in detail above, but some modifications or improvements can be made on the basis of the utility model, which is obvious to the general technical personnel in the technical field. Therefore, the modifications or improvements without departing from the utility model's ideological spirit are within the utility model's protection scope.

Claims

1. A dyeing yarn bobbin with a dyeing liquid recovery function, comprising a dyeing yarn bobbin soaking tank (1), characterized in that: The right side of the dyeing yarn drum soaking box (1) is provided with a dyeing liquid recovery mechanism (2), the left side of the dyeing yarn drum soaking box (1) is provided with a dyeing liquid conveying mechanism (3), the rear side of the dyeing yarn drum soaking box (1) is provided with a lifting mechanism (4), the middle of the inner cavity of the dyeing yarn drum soaking box (1) is fixedly installed with an inclined plate (11), the right side of the dyeing yarn drum soaking box (1) is provided with two threaded mounting holes (12) penetrating through the inner cavity, both of the threaded mounting holes (12) are located above the inclined plate (11), the dyeing liquid recovery mechanism (2) comprises two electric control valves (21), the right side output ends of the two electric control valves (21) are mutually penetrated with the inner cavity below the dyeing yarn drum soaking box (1), the left side input ends of the two electric control valves (21) are both fixedly connected with a connecting hose (22), the input ends of the two connecting hoses (22) are both connected with a filtering mechanism (23).

2. The dyeing spool with a dye solution recovery function according to claim 1, characterized in that: The filtering mechanism (23) comprises a threaded ring one (231), the threaded ring one (231) is connected with the inner ring of the threaded mounting hole (12) in a threaded manner, the right side of the threaded ring one (231) is fixedly connected with a rotary dismounting handle (232), the right side of the rotary dismounting handle (232) is fixedly connected with a threaded ring two (233), the inner ring of the threaded ring two (233) is fixedly connected with a filter cartridge (234) in a threaded manner, the outer wall of the threaded ring two (233) is fixedly connected with a metal connecting pipe (235) in a threaded manner, the right end of the metal connecting pipe (235) is fixedly connected with the input end of the connecting hose (22).

3. The dyeing spool with a dye solution recovery function according to claim 1, characterized in that: The dyeing liquid conveying mechanism (3) comprises a water pump (31), the water pump (31) is fixedly installed on the left side of the dyeing yarn drum soaking box (1), the input end of the water pump (31) is fixedly connected with a liquid pumping pipe (32), the input end of the liquid pumping pipe (32) is fixedly connected with the inner cavity bottom of the dyeing yarn drum soaking box (1), the top output end of the water pump (31) is fixedly connected with a liquid conveying pipe (34), the left side of the dyeing yarn drum soaking box (1) is fixedly installed with a liquid outlet box (33), the top end of the liquid conveying pipe (34) is fixedly connected with the inner cavity of the liquid outlet box (33), the right side of the liquid outlet box (33) is fixedly connected with a plurality of liquid spraying nozzles (35), the right ends of the plurality of liquid spraying nozzles (35) are all penetrated into the inner cavity of the dyeing yarn drum soaking box (1).

4. The dyeing spool with a dye solution recovery function according to claim 1, characterized in that: The lifting mechanism (4) comprises a lifting box (41), the lifting box (41) is fixedly installed on the rear side of the dyeing yarn drum soaking box (1), the rear side of the lifting box (41) is provided with a sliding groove (42), the bottom of the lifting box (41) is fixedly installed with a lifting motor (43), the output shaft of the lifting motor (43) is penetrated into the inner cavity of the sliding groove (42) and is fixedly installed with a lifting threaded rod (44), the outer wall of the lifting threaded rod (44) is fixedly installed with a C-shaped connecting plate (45), the front end of the upper horizontal part of the C-shaped connecting plate (45) is fixedly installed with a sealing cover (46), the sealing cover (46) is lowered and is clamped with the top of the dyeing yarn drum soaking box (1).

5. The dyeing spool with a dye solution recovery function according to claim 4, characterized in that: A rotary motor (47) is fixedly installed at the top center of the sealing cover (46), an output shaft of the rotary motor (47) penetrates to below the sealing cover (46) and is provided with a dyeing yarn bobbin positioning mechanism (49).

6. The dyeing spool with a dye solution recovery function according to claim 5, characterized in that: The dyeing yarn bobbin positioning mechanism (49) comprises a hanging plate (491), the top center of the hanging plate (491) is fixedly connected with the bottom end of a hanging rod (48), a plurality of insertion rods (492) are fixedly installed at the top annular array of the hanging plate (491), threaded holes (493) are formed at the top of the plurality of insertion rods (492), limit screws (494) are screw-mounted at the inner circle of the threaded holes (493), and yarn bobbin limiting plates (495) are fixedly installed at the top of the limit screws (494).