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

Abstract

The invention 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 body assembly, a lead screw transmission assembly and a power assembly, 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 service life of the spinning frame is prolonged. Therefore, the working efficiency and the yield of the spinning frame are ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of ring spinning machines, and in particular relates to a center-mounted lead screw transmission device for lifting an air frame of an ultra-long spinning machine. Background Art

[0002] The ring spinning frame is the most widely used mechanical equipment in the textile field. The number of its spindles directly reflects the production efficiency. As modern enterprises have higher and higher requirements for production efficiency, the manufacturing and assembly of ring spinning frames are generally based on a large number of spindles, which makes the ring spinning frame tend to develop into an ultra-long type; in addition, in order to reduce labor costs, the ring spinning frame is equipped with an automatic collective yarn dropping system, which involves the inward and outward swinging movement and the up and down lifting movement of the tube grabber, which is completed by the herringbone arm driving the air frame. The short arm of the herringbone arm is usually fitted on the inward and outward swinging arm through a pin shaft, and the inward and outward swinging arm drives the herringbone arm to rotate with the transmission tube as the axis, thereby realizing the inward and outward swinging of the air frame; the lifting movement of the air frame is realized by the long arm end of the herringbone arm following the translational movement of the transmission tube upward along the length of the spinning machine.

[0003] At present, in the collective doffing system of super-long spinning frames in China, a screw transmission device placed at the rear of the machine is used to drive the transmission tube of the entire machine to perform translational movement, and then drive the air frame of the entire machine to perform lifting and lowering movement. However, with the development of intelligent and special spinning frames, if the air frame still uses the existing driving method to realize its lifting and lowering movement, due to the long length of the transmission tube from the rear of the machine to the front of the machine, when the temperature of the workshop varies greatly at different times, as the temperature changes, the transmission tube expands and contracts due to heat and contracts, and deforms, especially the transmission tube at the front of the spinning frame has a greater cumulative deformation change, resulting in a displacement deviation of the transmission tube at the front of the spinning frame in the long direction or lateral distance. When the colonization system is running, the tube grabber on the air frame cannot press the empty tube on the spinning frame into place and the full tube cannot be pulled up, resulting in failure in the colonization process, which seriously affects the production efficiency and output of the spinning frame. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a centrally mounted screw transmission device for lifting the air frame of an extra-long spinning frame, to improve the structure of the screw transmission device for bidirectional drive, and to install it in the middle of the spinning frame body to realize bidirectional and segmented drive movement of the transmission tube, aiming 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] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A centrally mounted lead screw transmission device for lifting the air frame of an ultra-long spinning frame is applied to a collection system of the ultra-long spinning frame, wherein the collection system is symmetrically arranged on both sides of the spinning frame body to form two symmetrical collection stations, wherein the spinning frame body includes a plurality of middle wall panels for supporting the entire ultra-long spinning frame; each collection station includes an air frame, and a transmission tube is connected to the bottom of each of the air frames through a herringbone arm assembly, and the lifting and lowering of the air frame is realized by the reciprocating motion of the transmission tube along its extension direction, and the reciprocating motion of the transmission tube along its extension direction is driven by the lead screw transmission device, and the lead screw transmission device includes:

[0007] The box assembly comprises a mounting box, which is supported and mounted on the spinning frame body and is located in the middle of the spinning frame body;

[0008] A screw transmission assembly, comprising two screw transmission units with the same structure, the two screw transmission units are symmetrically arranged on both sides of the installation box, corresponding to the two collection stations respectively, and the two screw transmission units are simultaneously located on the support frame, each of the screw transmission units comprises a screw box, the interior of the screw box is connected to a sprocket nut which is an integral cylindrical shape through two combined bearings for common rotation, the sprocket nut comprises a nut part and a sprocket part which are integrally arranged, wherein the interior of the nut part is provided with a thread throughout the body, and is threadably connected to the screw through the thread, the two ends of the screw are detachably connected to the transmission tube, the extension direction of the transmission tube is the same as the extension direction of the screw, the rotation of the screw inside the sprocket nut realizes the movement of the transmission tube along its extension direction, and the movement range of the transmission tube is 0 to 750 mm; in addition, the sprocket part is arranged on the circumferential outer wall of the nut part;

[0009] A power assembly is disposed in the installation box, and the power assembly includes a driving motor. The output end of the driving motor is connected to a reducer via a first transmission assembly, and the output end of the reducer is connected to the sprocket part in each of the screw transmission units via a second transmission assembly, so as to provide the sprocket nut with rotational power with the screw as the axis.

[0010] Preferably, in each screw transmission unit of the screw transmission assembly, bearing end covers are respectively provided on both sides of the screw box, and the sprocket nut is supported inside the screw box through the cooperation of the two bearing end covers and the two combined bearings, and each bearing end cover is provided with a protrusion; in addition, a cover plate is also provided on the top of the screw box.

[0011] More preferably, both sides of the screw housing are provided with protective sleeves covering the screw and part of the transmission tube, and the protective sleeves do not interfere with the screw and the transmission tube. The protective sleeves are composed of semicircular covers that fit together, and the protective sleeves are connected to the raised parts on the bearing end covers through throat clamps, wherein the length of each protective sleeve is greater than the total length of the screw.

[0012] Furthermore, in each of the screw transmission units, a first oil filling hole is provided on the screw housing corresponding to each of the combined bearings, and each of the first oil filling holes is connected to the interior of the corresponding combined bearing through an oil path. In addition, a first oil cup is provided at each of the first oil filling holes, and lubricating oil is injected into the interior of the combined bearing through the first oil cup.

[0013] On this basis, a second oil filling hole is provided on the nut part of the sprocket nut, and the second oil filling hole directly penetrates the nut part and is connected to the fitting gap between the nut part and the screw. In addition, a second oil cup is provided at the second oil filling hole, and lubricating oil is injected into the fitting gap between the nut part and the screw through the second oil cup.

[0014] Furthermore, the oil circuit starts from the first oil filling hole, passes through the screw housing and the bearing end cover in sequence, and is connected to the interior of the combined bearing.

[0015] Preferably, in the power assembly, the first transmission assembly includes a driving wheel arranged at the output end of the driving motor, and a driven wheel arranged at the input end of the reducer, and the driving 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 arranged at the output end of the reducer, and two first transmission sprockets with identical structures and arranged at intervals are provided on the rotating shaft, wherein any one of the first transmission sprockets is connected to the sprocket part of the sprocket nut in any one of the screw transmission units through a transmission chain, and the other first transmission sprocket is also connected to the sprocket part of the sprocket nut in another screw transmission unit through a transmission chain, and on this basis, 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 provided with a tensioning assembly, and the tensioning assembly includes a tensioning seat arranged inside the mounting box, and a tensioning wheel is rotatably provided on the tensioning seat, and the tensioning wheel is engaged with the transmission chain to provide tensioning action for the transmission chain.

[0018] The beneficial effects of the present invention are:

[0019] In general, the centrally mounted screw transmission device for lifting the air frame of the extra-long spinning frame provided by the present invention, on the basis of arranging the screw transmission device in the middle part of the spinning frame body, also improves the structure of the screw transmission unit in the screw transmission device for bidirectional drive, and utilizes its bidirectional drive capability to drive the entire length of the transmission tube in each collection station in sections, directly reducing the influence of temperature on each section of the transmission tube, and avoiding the misalignment failure of the air frame driving the tube grabber to grab and insert the tube when the spinning frame collection system is working, thereby ensuring the working efficiency and output of the spinning frame.

[0020] Specifically, the screw transmission unit provided in each colony station of the present invention transmits the power output by the power assembly through the second transmission assembly, so that the movement direction and stroke of the transmission tube in each colony station are the same, and finally the unity of the entire super-long spinning frame colony is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the overall arrangement of the screw transmission device provided by the present invention in a spinning frame;

[0023] Figure 2 It is a partial structural schematic diagram of the assembly of the screw transmission device and the spinning frame in the present invention;

[0024] Figure 3 It is a specific structural cross-sectional view of the screw transmission unit in the present invention;

[0025] Figure 4 It is a schematic diagram of the matching structure of the box assembly and the lead screw transmission assembly in the present invention;

[0026] Figure 5 It is a schematic diagram of the matching structure of the power assembly and the screw transmission assembly in the present invention. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, 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 it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The present invention provides a center-mounted screw transmission device for lifting the air frame of an extra-long spinning frame, which is applied to the collection system of the extra-long spinning frame. The collection system described in the present invention is well known to technical personnel in this field, and generally includes a yarn tube conveying mechanism, an air frame lifting mechanism, an air frame inward and outward swinging mechanism, a yarn tube grabbing mechanism and a yarn guide plate flipping mechanism, and cooperates with various mechanisms through a control system and various sensors to finally obtain a finished spinning product. In view of the operating conditions of the extra-long spinning frame, the present invention aims at the problem that the lifting action of the air frame of the extra-long spinning frame is greatly affected by the temperature changes in the workshop. A center-mounted screw transmission device applied to the extra-long spinning frame is proposed in view of the problem that the lifting action of the air frame of the extra-long spinning frame is greatly affected by the temperature changes in the workshop, so as to strive to solve the misalignment fault caused by the lifting action of the air frame.

[0030] The solution provided by the present invention will be described in detail below with reference to the accompanying drawings.

[0031] In this technical solution, if Figure 1-2 As shown, a centrally mounted lead screw transmission device for lifting the air frame of an extra-long spinning frame is applied to the colonization system of the extra-long spinning frame. The colonization system is symmetrically arranged on both sides of the spinning frame body 1 to form two symmetrical colonization stations, wherein the spinning frame body 1 includes a plurality of middle wall panels 101 for supporting the entire extra-long spinning frame; each colonization station includes an air frame 2, and a transmission tube 3 is connected to the bottom of each air frame 2 through a herringbone arm assembly.

[0032] The lifting and lowering movement of the air rack 2 is realized by the reciprocating movement of the transmission tube 3 along its extension direction, and the reciprocating movement of the transmission tube 3 along its extension direction is driven by a screw transmission device. It should be noted that the lifting and lowering movement of the air rack 2 described in the present invention is based on the transmission structure composed of the transmission tube 3 and the herringbone arm assembly, wherein the specific structure of the herringbone arm assembly, and the connection form of the herringbone arm assembly, the air rack, and the transmission tube are all brought into use by the prior art, generally: the short arm end of the herringbone arm assembly is rotatably connected to the middle wall panel 101, and the transmission tube 3 is movably inserted into the middle wall panel 101, one end of the long arm of the herringbone arm assembly is rotatably connected to the air rack 2, and the other end is fixed on the transmission tube 3; when the transmission tube 3 is inserted in the middle wall panel 101, the long arm and the short arm of the herringbone arm assembly tend to approach and close or cross and separate, and the air rack 2 rises or falls.

[0033] Generally speaking, the screw transmission device includes: a box assembly 4 , a screw transmission assembly, and a power assembly 6 .

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

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

[0036] Each screw transmission unit 5 includes a screw housing 501, the interior of which is connected to a cylindrical sprocket nut 503 for joint rotation via two combined bearings 502. The sprocket nut 503 includes an integrally arranged nut portion 504 and a sprocket portion 505, wherein the interior of the nut portion 504 is provided with threads throughout the body and is threadedly connected to the screw 7 via the threads, and the two ends of the screw 7 are detachably connected with transmission tubes 3, and the extension direction of the transmission tube 3 is the same as the extension direction of the screw 7. The rotation of the screw 7 inside the sprocket nut 503 enables the transmission tube 3 to move along its extension direction, and the movement range of the transmission tube 3 is 0 to 750 mm; in addition, the sprocket portion 505 is arranged on the circumferential outer wall of the nut portion 504.

[0037] As an innovation of the present invention, the screw transmission unit 5 realizes the driving of the transmission tube 3 by the screw 7 through the threaded connection between the sprocket nut 503 and the screw 7. Since the screw transmission device is integrally arranged in the middle of the spinning frame body 1, and the transmission tube with the original length of the entire spinning frame is divided into two sections, the two ends of the screw 7 are respectively connected to the two sections of the transmission tube 3 and driven, which directly reduces the influence of temperature on each section of the transmission tube 3, and also avoids the misalignment failure of the air frame 2 driving the tube grabber to grab and insert the tube when the spinning frame collection system is working, thereby ensuring the working efficiency and output of the spinning frame body 1.

[0038] On this basis, if Figure 3 As shown, in each screw transmission unit 5 of the screw transmission assembly, bearing end covers 506 are respectively provided on both sides of the screw box 501, and the sprocket nut 503 is supported in the interior of the screw box 501 through the cooperation of the two bearing end covers 506 and the two combined bearings 502, and each bearing end cover 506 is provided with a protrusion 514; in addition, a cover plate 507 is also provided on the top of the screw box 501 to prevent impurities such as flying flowers and dust from flying into the interior of the screw box 501 and affecting the normal operation of the screw transmission assembly.

[0039] It is also important to note that if Figure 4-5 As shown, both sides of the screw housing 501 are provided with protective sleeves 508 covering the screw 7 and part of the transmission tube 3, and the protective sleeves 508 do not interfere with the screw 7 and the transmission tube 3. The protective sleeves 508 are composed of semicircular covers that fit together, and the protective sleeves 508 are connected to the raised portions 514 on the bearing end cover 506 through throat clamps, wherein the length of each protective sleeve 508 is greater than the total length of the screw 7.

[0040] Based on the above embodiment, the provision of the protective sleeve 508 ensures that even when the lead screw 7 runs to the extreme position in a certain direction, the lead screw 7 body will not extend out of the protective sleeve 508. Under the condition that the spinning machine body 1 runs for a long time, the covered lead screw 7 will not be affected by the adsorption of flying flowers and dust and its operation effect.

[0041] In addition, Figure 3 As shown, in view of the structural basis for the installation and rotation of the sprocket nut 503 in the screw box 501, the present invention also provides a first oil filling hole 509 for both combined bearings 502 and a second oil filling hole 510 for the nut portion 504 of the sprocket nut 503.

[0042] Among them, each first oil filling hole 509 is connected to the interior of the corresponding combined bearing 502 through the oil circuit 511. In addition, each first oil filling hole 509 is equipped with a first oil cup 512, and lubricating oil is injected into the interior of the combined bearing 502 through the first oil cup 512 to provide lubrication for the rotation of the sprocket nut 503 in the screw box 501; on this basis, the oil circuit 511 starts from the first oil filling hole 509, passes through the screw box 501 and the bearing end cover 506 in sequence, and is connected to the interior of the combined bearing 502.

[0043] In addition, the second oil filling hole 510 directly penetrates the nut part 504 and is connected to the fitting gap between the nut part 504 and the screw 7; a second oil cup 513 is provided at the second oil filling hole 510, and lubricating oil is injected into the fitting gap between the nut part 504 and the screw 7 through the second oil cup 513, thereby providing a lubrication effect for the rotation of the sprocket nut 503 on the screw 7.

[0044] At this point, the screw transmission assembly has a structural basis for providing power for the operation of the transmission tube 3 in a bidirectional driving manner at each collection station. Specifically, as for the power source of the screw transmission assembly, the present invention is provided with a power assembly 6.

[0045] like Figure 4-5 As shown, the power assembly 6 is arranged in the installation box 401, and the power assembly 6 includes a driving motor 601. The output end of the driving motor 601 is connected to the reducer 603 through the first transmission assembly 602. The output end of the reducer 603 is connected to the sprocket part 505 in each screw transmission unit 5 through the second transmission assembly 604, which is used to provide the sprocket nut 503 with rotational power around the screw 7 as the axis.

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

[0047] like Figure 5 As shown, the second transmission component 604 includes a rotating shaft 607 arranged at the output end of the reducer 603, and two first transmission sprockets 608 with the same structure and arranged at intervals are provided on the rotating shaft 607, wherein any first transmission sprocket 608 is connected to the sprocket part 505 of the sprocket nut 503 in any screw transmission unit 5 through a transmission chain 609, and the other first transmission sprocket 608 is also connected to the sprocket part 505 of the sprocket nut 503 in another screw transmission unit 5 through the transmission chain 609. On this basis, when the power component 6 is running, the two transmission chains 609 do not interfere with each other.

[0048] Based on the above embodiment, when the driving 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 matched 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, so that the sprocket nut 503 rotates in the screw box 501, and finally the linear motion of the screw 7 along its extension direction is obtained, providing moving power for the transmission tube 3 connected to the screw 7; and each screw transmission unit 5 is matched 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 colony station are the same, and finally the unity of the entire super-long spinning machine colony is achieved.

[0049] On this basis, if Figure 5 As shown, each transmission chain 609 is equipped with a tensioning assembly, which includes a tensioning seat 610 arranged inside the installation box 401, and a tensioning wheel 611 is rotatably arranged on the tensioning seat 610. The tensioning wheel 611 is engaged with the transmission chain 609 to provide a tensioning action 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, only their functions are introduced for use, and their specific structure is not elaborated in detail.

[0050] Generally speaking, the centrally mounted screw transmission device for lifting the air frame of the super-long spinning frame provided by the present invention is based on the arrangement of the screw transmission device in the middle of the spinning frame body 1, and the screw transmission unit 5 in the screw transmission device is improved by performing bidirectional driving. The bidirectional driving capability is utilized to drive the entire length of the transmission tube in each collection station in sections, which directly reduces the influence of the temperature on each section of the transmission tube 3, and also avoids the misalignment failure of the air frame 2 driving the tube grabber to grab and insert the tube when the spinning frame collection system is working, thereby ensuring The working efficiency and output of the spinning frame; in the power component 6, after the original output power of the driving motor 601 is transmitted to the reducer 603 by the first transmission component 602, the two first transmission sprockets 608 are respectively matched with the second transmission component 604 to transmit the power output of the reducer 603 to the sprocket part 505 of the sprocket nut 503 in each screw transmission unit 5, so that the movement direction and stroke of the transmission tube 3 in each colony station are the same, and finally the unity of the entire super-long spinning frame colony is achieved, which is beneficial to the overall control of the colonization process.

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

Claims

1. A centrally mounted screw transmission device for lifting the air frame of an ultra-long spinning frame is applied to the colony system of the ultra-long spinning frame. The colony system is symmetrically arranged on both sides of the spinning frame body to form two symmetrical colony stations, wherein: The spinning frame body includes a plurality of middle wall panels for supporting the entire super-long spinning frame; each collection station includes an air frame, and a transmission tube is connected to the bottom of each air frame through a herringbone arm assembly, and the lifting and lowering of the air frame is realized by the reciprocating motion of the transmission tube along its extension direction, and the reciprocating motion of the transmission tube along its extension direction is driven by a screw transmission device, characterized in that the screw transmission device includes: The box assembly comprises a mounting box, which is supported and mounted on the spinning frame body and is located in the middle of the spinning frame body; A screw transmission assembly, comprising two screw transmission units with the same structure, the two screw transmission units are symmetrically arranged on both sides of the installation box, corresponding to the two collection stations respectively, and the two screw transmission units are simultaneously located on the support frame, each of the screw transmission units comprises a screw box, the interior of the screw box is connected to a sprocket nut which is an integral cylindrical shape through two combined bearings for common rotation, the sprocket nut comprises a nut part and a sprocket part which are integrally arranged, wherein the interior of the nut part is provided with a thread throughout the body, and is threadably connected to the screw through the thread, the two ends of the screw are detachably connected to the transmission tube, the extension direction of the transmission tube is the same as the extension direction of the screw, the rotation of the screw inside the sprocket nut realizes the movement of the transmission tube along its extension direction, and the movement range of the transmission tube is 0 to 750 mm; in addition, the sprocket part is arranged on the circumferential outer wall of the nut part; A power assembly is disposed in the installation box, and the power assembly includes a driving motor. The output end of the driving motor is connected to a reducer via a first transmission assembly, and the output end of the reducer is connected to the sprocket part in each of the screw transmission units via a second transmission assembly, so as to provide the sprocket nut with rotational power with the screw as the axis.

2. The centrally mounted screw transmission device for lifting the air frame of the super-long spinning frame according to claim 1 is characterized in that: In each screw transmission unit of the screw transmission assembly, bearing end covers are respectively provided on both sides of the screw box, and the sprocket nut is supported inside the screw box through the cooperation of the two bearing end covers and the two combined bearings, and each bearing end cover is provided with a protrusion; in addition, a cover plate is also provided on the top of the screw box.

3. The centrally mounted screw transmission device for lifting the air frame of the super-long spinning frame according to claim 2 is characterized in that: Both sides of the screw box are provided with protective sleeves covering the screw and part of the transmission tube, and the protective sleeves do not interfere with the screw and the transmission tube. The protective sleeves are composed of semicircular covers that fit together, and the protective sleeves are connected to the raised parts on the bearing end covers through throat clamps, wherein the length of each protective sleeve is greater than the total length of the screw.

4. The centrally mounted screw transmission device for lifting the air frame of the super-long spinning frame according to claim 3 is characterized in that: In each of the screw transmission units, the screw housing is further provided with a first oil filling hole corresponding to each of the combined bearings, and each of the first oil filling holes is connected to the interior of the corresponding combined bearing through an oil path. In addition, each of the first oil filling holes is provided with a first oil cup, and lubricating oil is injected into the interior of the combined bearing through the first oil cup; On this basis, a second oil filling hole is provided on the nut part of the sprocket nut, and the second oil filling hole directly penetrates the nut part and is connected to the fitting gap between the nut part and the screw. In addition, a second oil cup is provided at the second oil filling hole, and lubricating oil is injected into the fitting gap between the nut part and the screw through the second oil cup.

5. The centrally mounted screw transmission device for lifting the air frame of the super-long spinning frame according to claim 4 is characterized in that: The oil circuit starts from the first oil filling hole, passes through the screw housing and the bearing end cover in sequence, and is connected to the interior of the combined bearing.

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

7. The centrally mounted screw transmission device for lifting the air frame of the super-long spinning frame according to claim 6 is characterized in that: In the power assembly, the second transmission assembly includes a rotating shaft arranged at the output end of the reducer, and two first transmission sprockets with the same structure and arranged at intervals are provided on the rotating shaft, wherein any one of the first transmission sprockets is connected to the sprocket part of the sprocket nut in any one of the screw transmission units through a transmission chain, and the other first transmission sprocket is also connected to the sprocket part of the sprocket nut in another screw transmission unit through a transmission chain. On this basis, when the power assembly is running, the two transmission chains do not interfere with each other.

8. The centrally mounted screw transmission device for lifting the air frame of the super-long spinning frame according to claim 7 is characterized in that: In the power assembly, each transmission chain is equipped with a tensioning assembly, which includes a tensioning seat arranged inside the mounting box, and a tensioning wheel is rotatably arranged on the tensioning seat. The tensioning wheel is engaged with the transmission chain to provide tensioning action for the transmission chain.

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