Middle-mounted lead screw transmission device for lifting air frame of super-long spinning frame

Abstract

The utility model belongs to the technical field of ring spinning frames, and particularly relates to a centrally-mounted lead screw transmission device for lifting an air frame of a super-long spinning frame, which comprises a box component, a lead screw transmission component and a power component. The box assembly comprises an installation box which is arranged on the spinning frame body through a supporting frame and located in the middle of the spinning frame body. The lead screw transmission assembly comprises two lead screw transmission units of the same structure, the two lead screw transmission units are symmetrically arranged on the two sides of the installation box body, and each lead screw transmission unit comprises a chain wheel nut and a lead screw and is connected with a transmission pipe through the two ends of the lead screw. The lead screw transmission device is arranged in the middle of the spinning frame, and the lead screw transmission unit is improved to be in a bidirectional driving mode, so that sectional driving of the transmission pipes is achieved, the influence of temperature on each section of the transmission pipes is directly reduced, dislocation faults of pipe grabbing and pipe inserting actions during working of a falling collecting system of the spinning frame are avoided, and the working efficiency is improved. Therefore, the working efficiency and the yield of the spinning frame are ensured.

Description

Technical Field

[0001] This utility model belongs to the technical field of ring spinning machines, specifically relating to a centrally located screw drive device for lifting the air frame of an extra-long ring spinning machine. Background Technology

[0002] Ring spinning frames are the most widely used pieces of machinery in the textile industry. The number of spindles directly reflects production efficiency. As modern enterprises demand increasingly higher production efficiency, the manufacturing and assembly of ring spinning frames are generally based on a large number of spindles. As a result, ring spinning frames tend to be ultra-long. In addition, to reduce labor costs, ring spinning frames are equipped with an automatic collective doffing system. The inward and outward swinging motion and the up and down lifting motion of the bobbin gripper are accomplished by the herringbone arm driving the air frame. The short arm of the herringbone arm is usually fitted onto the inward and outward swinging arms through a pin. The inward and outward swinging arms drive the herringbone arm to rotate around the drive tube as an axis, thereby realizing the inward and outward swinging motion of the air frame. The lifting motion of the air frame is achieved by the translational movement of the long arm end of the herringbone arm along the length of the spinning frame, following the drive tube.

[0003] Currently, in the collective doffing system of extra-long ring spinning frames in China, a screw drive device located at the rear of the frame is used to drive the transmission tube along the entire length of the frame to move horizontally, which in turn drives the air frame along the entire length to move vertically. However, with the development of intelligent and extra-long ring spinning frames, if the air frame still uses the existing drive method to achieve its vertical movement, the transmission tube from the rear to the front of the frame is quite long. When the workshop temperature varies greatly at different times, the transmission tube will deform due to thermal expansion and contraction with the temperature change. In particular, the cumulative deformation of the transmission tube at the front of the ring spinning frame is greater, causing displacement deviations in the longitudinal or lateral distances of the transmission tube at the front of the frame. When the doffing system is running, the tube gripper on the air frame cannot press the empty tubes on the ring spinning frame into place or pull out the full tubes, causing malfunctions in the doffing process and seriously affecting the production efficiency and output of the ring spinning frame. Utility Model Content

[0004] Therefore, the purpose of this utility model is to provide a centrally located screw drive device for lifting the air frame of an extra-long spinning frame. The screw drive device is structurally improved by bidirectional drive and installed in the middle of the spinning frame body to realize bidirectional, segmented drive of the transmission tube. This aims to reduce the impact of the environment on the transmission tube, thereby improving the production efficiency and output of the extra-long spinning frame.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A centrally located screw drive device for lifting the air frame of an extra-long spinning frame is applied to the loading system of the extra-long spinning frame. The loading system is symmetrically arranged on both sides of the spinning frame body, forming two symmetrical loading stations. The spinning frame body includes several central wall plates for supporting the entire extra-long spinning frame. Each loading station includes an air frame, and a transmission pipe is connected to the bottom of each air frame via a herringbone arm assembly. The lifting and lowering of the air frame is achieved by the reciprocating motion of the transmission pipe along its extension direction. The reciprocating motion of the transmission pipe along its extension direction is driven by a screw drive device, which includes:

[0007] The housing assembly includes a mounting housing, which is supported and mounted on the spinning machine body and located in the middle of the spinning machine body.

[0008] The lead screw drive assembly includes two identical lead screw drive units, which are symmetrically arranged on both sides of the mounting housing, corresponding to two collection stations respectively. Both lead screw drive units are located on the support frame. Each lead screw drive unit includes a lead screw housing. Inside the housing, a cylindrical sprocket nut is rotatably connected via two combined bearings. The sprocket nut includes an integrally formed nut portion and a sprocket portion. The nut portion has threads throughout and is threaded to the lead screw. The two ends of the lead screw are detachably connected to a transmission tube, which extends in the same direction as the lead screw. The rotation of the lead screw inside the sprocket nut enables the transmission tube to move along its extension direction, and the range of movement of the transmission tube is 0–750 mm. Furthermore, the sprocket portion is located on the outer circumferential wall of the nut portion.

[0009] A power assembly is housed within the mounting housing. The power assembly includes a drive motor, the output of which is connected to a reducer via a first transmission assembly. The output of the reducer is connected to a sprocket in each lead screw transmission unit via a second transmission assembly, for providing rotational power to the sprocket nut with the lead screw as the axis.

[0010] Preferably, in each screw drive unit of the screw drive assembly, the two sides of the screw housing are respectively provided with bearing end caps, and the sprocket nut is supported inside the screw housing by the cooperation of the two bearing end caps and the two combined bearings. Each bearing end cap is provided with a protrusion. In addition, the top of the screw housing is provided with a cover plate.

[0011] More preferably, both sides of the lead screw housing are provided with protective sleeves covering the lead screw and part of the transmission tube, and the protective sleeves do not interfere with the lead screw and the transmission tube. The protective sleeves are composed of interlocking semi-circular covers, and the protective sleeves are connected to the protrusions on the bearing end cover by hose clamps. The length of each protective sleeve is greater than the total length of the lead screw.

[0012] Furthermore, in each of the lead screw transmission units, the lead screw housing is provided with a first oil injection hole corresponding to each of the combined bearings. Each first oil injection hole is connected to the interior of the corresponding combined bearing through an oil passage. In addition, each first oil injection hole is provided with a first oil cup, and lubricating oil is injected into the interior of the combined bearing through the first oil cup.

[0013] Based on this, the sprocket nut is provided with a second oil injection hole on the nut part. The second oil injection hole directly penetrates the nut part and connects to the fitting gap between the nut part and the lead screw. In addition, a second oil cup is provided at the second oil injection hole, and lubricating oil is injected into the fitting gap between the nut part and the lead screw through the second oil cup.

[0014] Furthermore, the oil passage starts from the first oil injection hole, passes through the lead screw housing and the bearing end cover in sequence, and then connects to the interior of the combined bearing.

[0015] Preferably, in the power assembly, the first transmission assembly includes a drive wheel located at the output end of the drive motor and a driven wheel located at the input end of the reducer, wherein the drive wheel and the driven wheel are connected by a transmission belt.

[0016] Preferably, in the power assembly, the second transmission assembly includes a rotating shaft located at the output end of the reducer. The rotating shaft is provided with two identical and spaced-apart first transmission sprockets. Either of the first transmission sprockets is connected to the sprocket portion of the sprocket nut in either of the lead screw transmission units via a transmission chain. Similarly, the other first transmission sprocket is connected to the sprocket portion of the sprocket nut in another lead screw transmission unit via a transmission chain. Based on this, when the power assembly is running, the two transmission chains do not interfere with each other.

[0017] Furthermore, in the power assembly, each of the transmission chains is equipped with a tensioning assembly, which includes a tensioning seat disposed inside the mounting housing, and a tensioning wheel rotatably disposed on the tensioning seat. The tensioning wheel meshes with the transmission chain to provide tensioning action for the transmission chain.

[0018] The beneficial effects of this utility model are as follows:

[0019] In summary, the centrally located screw drive device for lifting the air frame of the extra-long spinning frame provided by this utility model, based on the fact that the screw drive device is located in the middle of the spinning frame body, further improves the structure of the screw drive unit in the screw drive device by bidirectional drive. By utilizing its bidirectional drive capability, the entire transmission tube in each collection station is driven in segments, which directly reduces the temperature impact on each segment of the transmission tube and avoids the misalignment failure of the air frame driving the tube gripper to grip and insert the tube during the operation of the spinning frame collection system, thereby ensuring the working efficiency and output of the spinning frame.

[0020] Specifically, this utility model is equipped with a screw drive unit in each collection station, which transmits the power output from the power unit through a second transmission component, thereby ensuring that the movement direction and stroke of the transmission tube in each collection station are the same, ultimately achieving uniformity of the entire ultra-long spinning machine collection. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic diagram showing the overall layout of the screw drive device provided by this utility model in a spinning machine;

[0023] Figure 2 This is a partial structural diagram of the screw drive device and the spinning frame in this utility model.

[0024] Figure 3 This is a cross-sectional view of the specific structure of the lead screw transmission unit in this utility model;

[0025] Figure 4 This is a schematic diagram of the cooperation structure between the housing assembly and the lead screw drive assembly in this utility model;

[0026] Figure 5 This is a schematic diagram of the cooperation structure between the power component and the lead screw transmission component in this utility model. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0029] The centrally located screw drive device for lifting the air frame of an extra-long spinning frame provided by this utility model is applied to the collection system of an extra-long spinning frame. The collection system described in this utility model is well known to those skilled in the art. It generally includes a yarn tube conveying mechanism, an air frame lifting mechanism, an air frame inward and outward swing mechanism, a yarn tube gripping mechanism, and a guide plate flipping mechanism. The control system, in conjunction with various sensors, enables the collaborative production of each mechanism to finally obtain the finished spinning product. Considering the operating conditions of extra-long spinning frames, this utility model addresses the problem that the lifting action of the air frame of an extra-long spinning frame is greatly affected by changes in workshop temperature. It proposes a centrally located screw drive device for extra-long spinning frames to solve the misalignment fault that occurs when the air frame is lifting.

[0030] The solution provided by this utility model will now be described in detail with reference to the accompanying drawings.

[0031] In this technical solution, such as Figure 1-2 As shown, a centrally located screw drive device for lifting the air frame of an extra-long spinning frame is applied to the collection system of the extra-long spinning frame. The collection system is symmetrically arranged on both sides of the spinning frame body 1, forming two symmetrical collection stations. The spinning frame body 1 includes several middle wall plates 101 for supporting the entire extra-long spinning frame. Each collection station includes an air frame 2, and each air frame 2 is connected to a transmission pipe 3 below it via a herringbone arm assembly.

[0032] The lifting and lowering motion of the air frame 2 is achieved by the reciprocating motion of the transmission pipe 3 along its extension direction, which is driven by a screw drive device. It should be noted that the lifting and lowering motion of the air frame 2 described in this utility model is based on the transmission structure composed of the transmission pipe 3 and the A-frame assembly. The specific structure of the A-frame assembly and the connection form between the A-frame assembly and the air frame and the transmission pipe are all based on existing technology. Generally, the short arm end of the A-frame assembly is rotatably connected to the middle wall plate 101, and the transmission pipe 3 is movably inserted through the middle wall plate 101. One end of the long arm of the A-frame assembly is rotatably connected to the air frame 2, and the other end is fixed to the transmission pipe 3. When the transmission pipe 3 moves through the middle wall plate 101, the long arm and the short arm of the A-frame assembly tend to approach and close or cross and separate, at which time the air frame 2 rises or falls.

[0033] Overall, the lead screw drive system includes: housing assembly 4, lead screw drive assembly, and power assembly 6.

[0034] like Figure 1 , Figure 4 As shown, the housing assembly 4 includes a mounting housing 401, which is mounted on the spinning machine body 1 via a support frame 402 and is located in the middle of the spinning machine body 1.

[0035] like Figure 3-4 As shown, the lead screw drive assembly includes two lead screw drive units 5 with identical structures. The two lead screw drive units 5 are symmetrically arranged on both sides of the mounting box 401, corresponding to two collection stations respectively. The two lead screw drive units 5 are simultaneously located on the support frame 402.

[0036] Each lead screw drive unit 5 includes a lead screw housing 501. Inside the lead screw housing 501, a cylindrical sprocket nut 503 is rotatably connected via two combined bearings 502. The sprocket nut 503 includes an integrally formed nut portion 504 and a sprocket portion 505. The nut portion 504 is threaded throughout and is threadedly connected to the lead screw 7. Both ends of the lead screw 7 are detachably connected to a transmission tube 3. The extension direction of the transmission tube 3 is the same as that of the lead screw 7. The rotation of the lead screw 7 inside the sprocket nut 503 enables the transmission tube 3 to move along its extension direction, and the range of movement of the transmission tube 3 is 0 to 750 mm. In addition, the sprocket portion 505 is located on the outer circumferential wall of the nut portion 504.

[0037] As an innovation of this utility model, the lead screw transmission unit 5 achieves the drive of the lead screw 7 to the transmission tube 3 through the threaded connection between the sprocket nut 503 and the lead screw 7. Since the lead screw transmission device is located in the middle of the spinning machine body 1, and the original transmission tube with a length equal to the overall length of the spinning machine is divided into two sections, the two ends of the lead screw 7 are connected to the two sections of the transmission tube 3 respectively and driven, which directly reduces the temperature influence on each section of the transmission tube 3, and also avoids the misalignment fault of the air frame 2 driving the tube gripper to perform tube gripping and insertion actions when the spinning machine collection system is working, thereby ensuring the working efficiency and output of the spinning machine body 1.

[0038] Based on this, such as Figure 3 As shown, in each screw drive unit 5 of the screw drive assembly, the screw housing 501 is provided with bearing end caps 506 on both sides, and the sprocket nut 503 is supported inside the screw housing 501 by the cooperation of the two bearing end caps 506 and the two combined bearings 502. Each bearing end cap 506 is provided with a protrusion 514. In addition, the top of the screw housing 501 is provided with a cover plate 507 to prevent flying debris, dust and other impurities from flying into the screw housing 501 and affecting the normal operation of the screw drive assembly.

[0039] It is also important to note that, such as Figure 4-5 As shown, both sides of the lead screw housing 501 are provided with protective sleeves 508 covering the lead screw 7 and part of the transmission tube 3. The protective sleeves 508 do not interfere with the lead screw 7 and the transmission tube 3. The protective sleeves 508 are composed of interlocking semi-circular covers, and the protective sleeves 508 are connected to the protrusions 514 on the bearing end cover 506 by hose clamps. The length of each protective sleeve 508 is greater than the total length of the lead screw 7.

[0040] Based on the above embodiments, the protective sleeve 508 ensures that even when the lead screw 7 moves to its limit position in a certain direction, the lead screw 7 body will not extend into the protective sleeve 508. Under the condition of long-term operation of the spinning machine body 1, the covered lead screw 7 will not be affected by the adsorption of fly hair and dust.

[0041] In addition, such as Figure 3 As shown, for the structural basis of the sprocket nut 503 being installed and rotating in the screw housing 501, this utility model also provides a first oil injection hole 509 for both combined bearings 502 and a second oil injection hole 510 for the nut part 504 of the sprocket nut 503.

[0042] Each first oil injection hole 509 is connected to the interior of the corresponding combined bearing 502 via an oil passage 511. In addition, each first oil injection hole 509 is equipped with a first oil cup 512, which injects lubricating oil into the interior of the combined bearing 502 to provide lubrication for the rotation of the sprocket nut 503 in the screw housing 501. Based on this, the oil passage 511 starts from the first oil injection hole 509, passes through the screw housing 501 and the bearing end cover 506 in sequence, and then connects to the interior of the combined bearing 502.

[0043] In addition, the second oil injection hole 510 directly penetrates the nut part 504 and connects to the fitting gap between the nut part 504 and the lead screw 7; a second oil cup 513 is provided at the second oil injection hole 510, and lubricating oil is injected into the fitting gap between the nut part 504 and the lead screw 7 through the second oil cup 513, so as to provide lubrication for the rotation of the sprocket nut 503 on the lead screw 7.

[0044] Thus, the screw drive assembly has the structural basis to provide power for the operation of the transmission pipe 3 by adopting a bidirectional drive method at each collection station. Specifically, regarding the power source of the screw drive assembly, this utility model is equipped with a power assembly 6.

[0045] like Figure 4-5 As shown, the power assembly 6 is housed in the mounting housing 401. The power assembly 6 includes a drive motor 601. The output end of the drive motor 601 is connected to a reducer 603 via a first transmission assembly 602. The output end of the reducer 603 is connected to the sprocket portion 505 in each lead screw transmission unit 5 via a second transmission assembly 604, for providing rotational power to the sprocket nut 503 with the lead screw 7 as the axis.

[0046] Specifically, such as Figure 4-5 As shown, the first transmission assembly 602 includes a drive wheel located at the output end of the drive motor 601 and a driven wheel 605 located at the input end of the reducer 603. The drive wheel and the driven wheel 605 are connected by a transmission belt 606.

[0047] like Figure 5 As shown, the second transmission assembly 604 includes a rotating shaft 607 located at the output end of the reducer 603. The rotating shaft 607 is provided with two first transmission sprockets 608 with identical structures and spaced apart. Either first transmission sprocket 608 is connected to the sprocket portion 505 of the sprocket nut 503 in any lead screw transmission unit 5 via a transmission chain 609. The other first transmission sprocket 608 is also connected to the sprocket portion 505 of the sprocket nut 503 in another lead screw transmission unit 5 via a transmission chain 609. Based on this, when the power assembly 6 is running, the two transmission chains 609 do not interfere with each other.

[0048] Based on the above embodiments, when the drive motor 601 is working, its output power is transmitted to the reducer 603 through the first transmission component 602. After the reducer 603 reduces the input power and increases the torque, the two first transmission sprockets 608 are respectively paired with the second transmission component 604 to transmit the power to the sprocket part 505 of the sprocket nut 503 in each screw transmission unit 5, thereby causing the sprocket nut 503 to rotate in the screw housing 501, and finally obtaining the linear motion of the screw 7 along its extension direction, providing the moving power for the transmission tube 3 connected to the screw 7; and each screw transmission unit 5 is equipped with the first transmission sprocket 608 and the second transmission component 604 with the same structure for power transmission, so that the movement direction and stroke of the transmission tube 3 in each collection station are the same, and finally achieve the uniformity of the entire ultra-long spinning machine collection.

[0049] Based on this, such as Figure 5 As shown, each transmission chain 609 is equipped with a tensioning assembly. The tensioning assembly includes a tensioning seat 610 located inside the mounting housing 401. A tensioning wheel 611 is rotatably mounted on the tensioning seat 610. The tensioning wheel 611 meshes with the transmission chain 609 to provide tension for the transmission chain 609. It should be noted that the reducer 603 and the tensioning assembly are conventional settings used in the field of mechanical transmission in the prior art. In this application, their functions are only used in a general sense, and their specific structures are not described in detail.

[0050] In general, the centrally located screw drive device for lifting the air frame of the extra-long spinning frame provided by this utility model, based on the fact that the screw drive device is located in the middle of the spinning frame body 1, further improves the structure of the screw drive unit 5 in the screw drive device by making bidirectional drive. Utilizing its bidirectional drive capability, the entire length of the transmission tube in each collection station is driven in segments, directly reducing the temperature impact on each segment of the transmission tube 3, and also avoiding misalignment faults in the spinning frame collection system during operation, where the air frame 2 drives the tube gripper to grip and insert the tube, thereby ensuring... This improves the working efficiency and output of the spinning frame. In the power assembly 6, the original output power of the drive motor 601 is transmitted to the reducer 603 by the first transmission assembly 602. Then, the power output of the reducer 603 is transmitted to the sprocket part 505 of the sprocket nut 503 in each screw transmission unit 5 by the two first transmission sprockets 608 respectively in conjunction with the second transmission assembly 604. This ensures that the movement direction and stroke of the transmission tube 3 in each collection station are the same, ultimately achieving the uniformity of the entire collection of the extra-long spinning frame, which is beneficial to the overall control of the collection process.

[0051] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A centrally located screw drive device for lifting the air frame of an extra-long spinning frame, applied to the collection system of an extra-long spinning frame. The collection system is symmetrically arranged on both sides of the spinning frame body, forming two symmetrical collection stations. The spinning frame body includes several middle wall plates for supporting the entire extra-long spinning frame; each collection station includes an air frame, and a transmission pipe is connected to the bottom of each air frame via a herringbone arm assembly. The air frame is raised and lowered by the reciprocating motion of the transmission pipe along its extension direction, and the reciprocating motion of the transmission pipe along its extension direction is driven by a screw drive device. The screw drive device comprises: The housing assembly includes a mounting housing, which is supported and mounted on the spinning machine body and located in the middle of the spinning machine body. The lead screw drive assembly includes two identical lead screw drive units, which are symmetrically arranged on both sides of the mounting housing, corresponding to two collection stations respectively. Both lead screw drive units are located on the support frame. Each lead screw drive unit includes a lead screw housing. Inside the housing, a cylindrical sprocket nut is rotatably connected via two combined bearings. The sprocket nut includes an integrally formed nut portion and a sprocket portion. The nut portion has threads throughout and is threaded to the lead screw. The two ends of the lead screw are detachably connected to a transmission tube, which extends in the same direction as the lead screw. The rotation of the lead screw inside the sprocket nut enables the transmission tube to move along its extension direction, and the range of movement of the transmission tube is 0–750 mm. Furthermore, the sprocket portion is located on the outer circumferential wall of the nut portion. A power assembly is housed within the mounting housing. The power assembly includes a drive motor, the output of which is connected to a reducer via a first transmission assembly. The output of the reducer is connected to a sprocket in each lead screw transmission unit via a second transmission assembly, for providing rotational power to the sprocket nut with the lead screw as the axis.

2. The centrally located screw drive device for lifting the air frame of an extra-long spinning frame according to claim 1, characterized in that: In each screw drive unit of the screw drive assembly, the two sides of the screw housing are respectively provided with bearing end caps, and the sprocket nut is supported inside the screw housing by the cooperation of the two bearing end caps and the two combined bearings. Each bearing end cap is provided with a protrusion; in addition, the top of the screw housing is also provided with a cover plate.

3. The centrally located screw drive device for lifting the air frame of an extra-long spinning frame according to claim 2, characterized in that: Both sides of the lead screw housing are provided with protective sleeves covering the lead screw and part of the transmission tube. The protective sleeves do not interfere with the lead screw and the transmission tube. The protective sleeves are composed of interlocking semi-circular covers and are connected to the protrusions on the bearing end cover by hose clamps. The length of each protective sleeve is greater than the total length of the lead screw.

4. The centrally located screw drive device for lifting the air frame of an extra-long spinning frame according to claim 3, characterized in that: In each of the lead screw transmission units, the lead screw housing is also provided with a first oil injection hole corresponding to each of the combined bearings. Each first oil injection hole is connected to the interior of the corresponding combined bearing through an oil passage. In addition, each first oil injection hole is provided with a first oil cup, and lubricating oil is injected into the interior of the combined bearing through the first oil cup. Based on this, the sprocket nut is provided with a second oil injection hole on the nut part. The second oil injection hole directly penetrates the nut part and connects to the fitting gap between the nut part and the lead screw. In addition, a second oil cup is provided at the second oil injection hole, and lubricating oil is injected into the fitting gap between the nut part and the lead screw through the second oil cup.

5. The centrally located screw drive device for lifting the air frame of an extra-long spinning frame according to claim 4, characterized in that: The oil passage starts from the first oil injection hole, passes through the lead screw housing and the bearing end cover in sequence, and then connects to the interior of the combined bearing.

6. The centrally located screw drive device for lifting the air frame of an extra-long spinning frame according to claim 5, characterized in that: In the power assembly, the first transmission assembly includes a drive wheel located at the output end of the drive motor and a driven wheel located at the input end of the reducer, wherein the drive wheel and the driven wheel are connected by a transmission belt.

7. The centrally located screw drive device for lifting the air frame of an extra-long spinning frame according to claim 6, characterized in that: In the power assembly, the second transmission assembly includes a rotating shaft located at the output end of the reducer. The rotating shaft is provided with two identical and spaced-apart first transmission sprockets. Either of the first transmission sprockets is connected to the sprocket portion of the sprocket nut in either of the lead screw transmission units via a transmission chain. Similarly, the other first transmission sprocket is connected to the sprocket portion of the sprocket nut in another lead screw transmission unit via a transmission chain. Based on this, when the power assembly is running, the two transmission chains do not interfere with each other.

8. The centrally located screw drive device for lifting the air frame of an extra-long spinning frame according to claim 7, characterized in that: In the power assembly, each of the transmission chains is equipped with a tensioning assembly. The tensioning assembly includes a tensioning seat located inside the mounting housing, and a tensioning wheel rotatably mounted on the tensioning seat. The tensioning wheel meshes with the transmission chain to provide tension to the transmission chain.

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