Roller pressure self-locking structure of cotton spinning drawing frame

Abstract

The invention relates to the technical field of cotton spinning drawing frames, in particular to a cotton spinning drawing frame roller pressure self-locking structure which comprises a frame, a lower roller rotationally connected with one side of the frame through a bearing seat and a fixing frame arranged on one side of the frame. The servo motor drives the worm and gear and the threaded rod to carry out accurate initial position adjustment, the self-locking characteristic of the worm and gear pair is used for achieving first mechanical locking, and the threaded rod drives the bevel gear set and the transmission chain at the same time; the second wedge-shaped block and the first wedge-shaped block are tightly pressed to generate second friction locking, meanwhile, the contact position can be periodically and slightly moved, the locking reliability is greatly improved, the six-edge sliding rod is released in the adjusting state and strongly locked in the working state through a third self-locking mechanism controlled through electromagnetism, third rigid locking is formed, and the locking reliability is greatly improved. The triple locking mechanisms are connected in parallel in space and cooperate in function, and the drafting quality and the operation reliability of the drawing frame are improved.

Description

Technical Field

[0001] This invention relates to the field of cotton spinning drawing frame technology, and more particularly to a self-locking structure for roller pressure in cotton spinning drawing frame. Background Technology

[0002] The cotton spinning drawing frame is the core equipment in the spinning process. It uses multiple sets of rollers to draft and combine the fiber sliver to improve yarn evenness. The drafting quality directly determines the quality of the subsequent yarn. The pressure between the rollers is a key parameter in the drafting process. Unstable pressure can easily lead to problems such as sliver breakage, uneven yarn, and fiber damage.

[0003] Currently, traditional drawing frames rely heavily on simple threaded pairs and spring combinations for roller pressure application and adjustment, with pressure locking primarily depending on the self-locking property of the threads or the tightening force of the nut. However, under the complex vibrations generated by the continuous high-speed operation of the drawing frame, this single locking method is prone to slight mechanical backlash, leading to pressure attenuation. Moreover, during prolonged high-speed operation, vibration and wear can cause problems such as pressure loosening and spacing changes, resulting in uneven drafting and deterioration of the frame's evenness. Therefore, there is an urgent need for a self-locking structure that can maintain constant pressure, provide reliable locking, and is easy to adjust under dynamic operating conditions. Summary of the Invention

[0004] The purpose of this invention is to provide a self-locking structure for the roller pressure of a cotton spinning drawing frame. By coordinating the first self-locking mechanism, the second self-locking mechanism and the third self-locking mechanism, the problem of easy loosening of pressure and poor stability under vibration in the existing roller self-locking structure is solved.

[0005] The technical solution of this invention is as follows: a self-locking structure for roller pressure of a cotton spinning drawing frame, comprising a frame, a lower roller rotatably connected to one side of the frame via a bearing seat, a fixed frame disposed on one side of the frame, an adjusting block disposed within the cavity of the fixed frame, and an upper roller rotatably connected to one side of the adjusting block via a bearing seat. A servo motor is fixedly connected to the top of the fixed frame, and a first self-locking mechanism is disposed inside the fixed frame. The first self-locking mechanism includes a threaded rod rotatably connected to the fixed frame via a bearing seat, and a threaded tube threadedly connected to the surface of the threaded rod. The first self-locking mechanism performs a first press on the adjusting block. The adjusting block is mechanically locked, and a second self-locking mechanism is provided on the top of the adjusting block. The second self-locking mechanism includes a first wedge block fixedly connected to the top of the adjusting block and a second wedge block in contact with the first wedge block. The wedge block is self-locked by friction on its inclined surface, forming a second friction lock. A third self-locking mechanism is provided on the left side of the top of the adjusting block. The third self-locking mechanism includes a slide rod fixedly connected to the left side of the top of the adjusting block, a fixed sleeve sleeved on the surface of the slide rod, and a friction plate disposed inside the fixed sleeve. The friction plate holds the slide rod in place, forming a third rigid lock.

[0006] Preferably, the first self-locking mechanism further includes a worm gear fixedly connected to the output shaft of the servo motor, a worm wheel meshing with the surface of the worm gear, a worm wheel shaft fixedly connected to one end of a threaded rod, and a threaded tube fixedly connected to an adjusting block.

[0007] Preferably, the second self-locking mechanism further includes a bevel gear set disposed on the surface of the threaded rod, a sleeve fixedly connected to one side of the bevel gear set, a transmission component disposed on one side of the sleeve, a fixed shaft fixedly connected to one side of the transmission component, a drive gear fixedly connected to the surface of the fixed shaft, a toothed plate meshing with the surface of the drive gear, a first slide groove opened on one side of the second wedge block, a first slide rail slidably connected to the slide groove, an adjustment component disposed on one side of the first slide rail, a mounting plate fixedly connected to the top of the first slide rail, second slide grooves opened on both sides of the first slide rail, and a second slide rail slidably connected to the inner cavity of the second slide groove.

[0008] Preferably, the bevel gear set includes a first bevel gear fixedly connected to the surface of the threaded rod, a second bevel gear meshing with the surface of the first bevel gear, the shaft of the second bevel gear being fixedly connected to the surface of the sleeve, and the surface of the sleeve being rotatably connected to the inner side of the fixed frame through a bearing seat.

[0009] Preferably, the transmission assembly includes a transmission rod slidably connected to the inner cavity of the sleeve, a locking block fixedly connected to the surface of the transmission rod, a locking groove in the inner cavity of the sleeve that matches the locking block, a first synchronous pulley fixedly connected to the surface of the transmission rod, a synchronous belt drivingly connected to the first synchronous pulley, a second synchronous pulley drivingly connected to the first synchronous pulley via the synchronous belt, the axis of the second synchronous pulley being fixedly connected to the surface of the fixed shaft, and the transmission rod being rotatably connected to the inside of the mounting plate via a bearing seat.

[0010] Preferably, the adjustment assembly includes an adjustment rod movably connected to the surface of the first slide rail, an adjustment sleeve movably connected to the other end of the adjustment rod, the inner side of the adjustment sleeve being fixedly connected to the surface of the threaded tube, one end of the fixed shaft being rotatably connected to one side of the mounting plate via a bearing seat, one side of the second slide rail being fixedly connected to the inner side of the fixed frame, and the toothed plate being fixedly connected to the top of the second wedge block.

[0011] Preferably, cleaning brushes are rotatably connected to both sides of the second wedge block via pins. A first spring is fixedly connected to one side of the cleaning brush, and a baffle is fixedly connected to the other end of the first spring. One side of the baffle is fixedly connected to one side of the second wedge block.

[0012] Preferably, the third self-locking mechanism further includes grooves formed at the top and bottom of the fixed sleeve, a drive block disposed in the inner cavity of the groove, a connecting rod fixedly connected to one side of the drive block, a second spring sleeved on the surface of the connecting rod, a drive assembly disposed on the surface of the fixed sleeve, and the other end of the connecting rod being fixedly connected to the surface of the friction plate.

[0013] Preferably, the drive assembly includes a drive cylinder fixedly connected to the surface of the fixed sleeve, electromagnetic rings disposed at the top and bottom of the inner cavity of the drive cylinder, a metal disc disposed in the inner cavity of the drive cylinder, a reset spring fixedly connected between the two metal discs, and a drive plate fixedly connected to one side of the metal disc.

[0014] Preferably, the slide bar has a regular hexagonal cross-section, the fixing sleeve is fixedly connected to the inside of the fixing frame, the top of the fixing frame has a sliding hole adapted to the slide bar, and the number of friction plates is six, each corresponding to one of the six sides of the slide bar.

[0015] The beneficial effects of this invention are as follows: A servo motor drives the worm gear and threaded rod for precise initial position adjustment, and the self-locking characteristic of the worm gear pair itself achieves the first level of mechanical locking. Simultaneously, the threaded rod drives the bevel gear set and transmission chain, causing the second wedge block to press against the inclined surface of the first wedge block to generate a second level of frictional locking. At the same time, it can periodically move its contact position slightly, avoiding localized wear and using a cleaning brush to keep the inclined surface clean, greatly enhancing locking reliability. A third self-locking mechanism, controlled by an electromagnetic induction, releases in the adjustment state and forcefully locks the hexagonal slide bar in the working state, forming a third level of rigid locking. These three locking mechanisms are connected in parallel in space and work together functionally, ensuring constant roller pressure during long-term high-speed operation and improving the drafting quality and operational reliability of the drawing frame. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0017] Figure 1 A perspective view of a self-locking structure for roller pressure in a cotton spinning drawing frame; Figure 2 This is a diagram showing the coordination of the first self-locking mechanism, the second self-locking mechanism, and the third self-locking mechanism in a self-locking structure of roller pressure in a cotton spinning drawing frame. Figure 3 This is a diagram showing the fit between the first and second wedge blocks in a self-locking structure of the roller pressure in a cotton spinning drawing frame. Figure 4 A three-dimensional view of the second wedge block in a self-locking structure of the roller pressure of a cotton spinning drawing frame; Figure 5 This is a diagram showing the fit between the first and second slide rails in a self-locking structure of the roller pressure in a cotton spinning drawing frame. Figure 6 This is a schematic diagram of an adjusting component in a self-locking structure for roller pressure in a cotton spinning drawing frame; Figure 7 This is a schematic diagram of the second self-locking mechanism in a self-locking structure of roller pressure in a cotton spinning drawing frame; Figure 8 This is a schematic diagram of the transmission component in a self-locking structure of the roller pressure of a cotton spinning drawing frame; Figure 9 This is a schematic diagram of the first self-locking mechanism in a self-locking structure of roller pressure in a cotton spinning drawing frame; Figure 10 This is a schematic diagram of the third self-locking mechanism in the roller pressure self-locking structure of a cotton spinning drawing frame; Figure 11 A cross-sectional view of the third self-locking mechanism in the roller pressure self-locking structure of a cotton spinning drawing frame; Figure 12 for Figure 11 A magnified view of a section at point A in the middle; Figure 13 This is a diagram showing the fit between the drive block, connecting rod, and friction plate in a self-locking structure of the roller pressure of a cotton spinning drawing frame.

[0018] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Lower roller; 3. Fixed bracket; 4. Adjusting block; 5. Upper roller; 6. Servo motor; 7. First self-locking mechanism; 71. Threaded rod; 72. Threaded tube; 73. Worm gear; 74. Worm wheel; 8. Second self-locking mechanism; 81. First wedge block; 82. Second wedge block; 83. Bevel gear set; 831. First bevel gear; 832. Second bevel gear; 84. Sleeve; 85. Transmission assembly; 851. Transmission rod; 852. Locking block; 853. Locking groove; 854. Synchronous belt; 86. Fixed shaft; 87. Drive gear; 88. Tooth plate; 89. 810. First slide groove; 811. First slide rail; 812. Adjustment component; 813. Adjustment rod; 814. Adjustment sleeve; 815. Mounting plate; 816. Second slide groove; 817. Second slide rail; 9. Third self-locking mechanism; 91. Slide rod; 92. Fixed sleeve; 93. Friction plate; 94. Groove; 95. Drive block; 96. Connecting rod; 97. Second spring; 98. Drive component; 981. Drive cylinder; 982. Electromagnetic ring; 983. Metal disc; 984. Return spring; 985. Drive plate; 10. Cleaning brush; 11. First spring; 12. Baffle; 13. Slide hole. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. The described embodiments are only some embodiments of the present invention, and not all embodiments. Example 1

[0020] Please see Figures 1-13This is the first embodiment of the present invention, which provides a self-locking structure for the roller pressure of a cotton spinning drawing frame. It includes a frame 1, a lower roller 2 rotatably connected to one side of the frame 1 via a bearing seat, a fixed frame 3 disposed on one side of the frame 1, an adjusting block 4 disposed within the cavity of the fixed frame 3, an upper roller 5 rotatably connected to one side of the adjusting block 4 via a bearing seat, a servo motor 6 fixedly connected to the top of the fixed frame 3, and a first self-locking mechanism 7 disposed inside the fixed frame 3. The first self-locking mechanism 7 includes a threaded rod 71 rotatably connected to the fixed frame 3 via a bearing seat, and a threaded tube 72 threadedly connected to the surface of the threaded rod 71. The first self-locking mechanism 7 provides a first mechanical locking of the adjusting block 4. The first self-locking mechanism 7 also includes a worm gear 73 fixedly connected to the output shaft of the servo motor 6, and a worm wheel 74 meshing with the surface of the worm gear 73. The axis of the worm wheel 74 is fixedly connected to one end of the threaded rod 71, and one end of the threaded tube 72 is fixedly connected to the adjusting block 4. Frame 1 serves as the basic support component of the entire machine, horizontally fixed to the body of the drawing frame. The lower roller 2 is installed on one side via a bearing seat, and the fixed frame 3 is supported by a column on the other side. The inner side of the fixed frame 3 is hollow, forming a space to accommodate the adjusting block 4, the first self-locking mechanism 7, the second self-locking mechanism 8, and the third self-locking mechanism 9. The adjusting block 4 is located in the middle of the inner cavity of the fixed frame 3 and can slide vertically. One side is connected to the upper roller 5 via a bearing seat (the axis of the upper roller 5 is parallel to the axis of the lower roller 2). The top left side is vertically fixed to the sliding rod 91 (a regular hexagonal prism with a vertical axis). The core of the first self-locking mechanism 7 is driven by the servo motor 6. The output shaft of the servo motor 6 is connected to the worm gear 73. The worm gear 73 meshes with the worm wheel 74, and the worm wheel 74 is fixed to one end of the threaded rod 71. The threaded rod 71 and the threaded tube 72 form a threaded pair. The lower end of the threaded tube 72 is fixed to the adjusting block 4.

[0021] During operation, the servo motor 6 is started, and the power is transmitted to the threaded rod 71 through the worm 73 and worm wheel 74, causing it to rotate. This drives the threaded tube 72 and the adjusting block 4 and upper roller 5 fixed thereto to move up and down as a whole, thereby precisely adjusting the gap (i.e., pressure setting) between the upper roller 5 and the lower roller 2. When the adjustment stops, the inherent reverse self-locking characteristic of the worm wheel 74 and worm 73 pair (lead angle is less than friction angle) immediately takes effect, which can prevent the threaded rod 71 from slightly reversing due to vibration. At the same time, the static friction between the threaded tube 72 and the threaded rod 71 further locks the position, thereby locking the vertical main position of the adjusting block 4, forming the first layer of self-locking. Example 2

[0022] Please see Figures 2-9 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0023] Specifically: A second self-locking mechanism 8 is provided on the top of the adjusting block 4. The second self-locking mechanism 8 includes a first wedge block 81 fixedly connected to the top of the adjusting block 4, and a second wedge block 82 in contact with the first wedge block 81. Self-locking is achieved through frictional locking of the inclined surfaces of the wedge blocks in the second self-locking mechanism 8, forming a second frictional locking. The second self-locking mechanism 8 also includes a bevel gear set 83 disposed on the surface of the threaded rod 71, a sleeve 84 fixedly connected to one side of the bevel gear set 83, and a transmission assembly 85 disposed on one side of the sleeve 84. A fixed shaft 86 is fixedly connected to the side, a drive gear 87 is fixedly connected to the surface of the fixed shaft 86, a toothed plate 88 meshes with the surface of the drive gear 87, a first slide groove 89 is opened on one side of the second wedge block 82, a first slide rail 810 is slidably connected to the slide groove, an adjustment component 811 is provided on one side of the first slide rail 810, a mounting plate 812 is fixedly connected to the top of the first slide rail 810, a second slide groove 813 is opened on both sides of the first slide rail 810, and a second slide rail 814 is slidably connected to the inner cavity of the second slide groove 813.

[0024] The bevel gear set 83 includes a first bevel gear 831 fixedly connected to the surface of the threaded rod 71, a second bevel gear 832 meshing with the surface of the first bevel gear 831, the shaft of the second bevel gear 832 fixedly connected to the surface of the sleeve 84, the surface of the sleeve 84 rotatably connected to the inner side of the fixed frame 3 through a bearing seat, the transmission assembly 85 includes a transmission rod 851 slidably connected to the inner cavity of the sleeve 84, a locking block 852 fixedly connected to the surface of the transmission rod 851, a locking groove 853 in the inner cavity of the sleeve 84 adapted to the locking block 852, a first synchronous pulley fixedly connected to the surface of the transmission rod 851, a synchronous belt 854 pulverizedly connected to the first synchronous pulley, a second synchronous pulley pulverizedly connected to the first synchronous pulley through the synchronous belt 854, the shaft of the second synchronous pulley fixedly connected to the surface of the fixed shaft 86, and the transmission rod 851 rotatably connected to the inside of the mounting plate 812 through a bearing seat.

[0025] The adjustment assembly 811 includes an adjustment rod 8111 movably connected to the surface of the first slide rail 810, and an adjustment sleeve 8112 movably connected to the other end of the adjustment rod 8111. The inner side of the adjustment sleeve 8112 is fixedly connected to the surface of the threaded tube 72. One end of the fixed shaft 86 is rotatably connected to one side of the mounting plate 812 through a bearing seat. One side of the second slide rail 814 is fixedly connected to the inner side of the fixed frame 3. The toothed plate 88 is fixedly connected to the top of the second wedge block 82. Both sides of the second wedge block 82 are rotatably connected to cleaning brushes 10 through pins. One side of the cleaning brush 10 is fixedly connected to a first spring 11. The other end of the first spring 11 is fixedly connected to a baffle 12. One side of the baffle 12 is fixedly connected to one side of the second wedge block 82.

[0026] The width of the first wedge block 81 is greater than the width of the second wedge block 81 to ensure that the contact surface is completely covered. The rotational motion of the threaded rod 71 is simultaneously distributed to two systems: one system is used to drive the threaded tube 72 to rise and fall (as in Embodiment 1); the other system is used to drive the second wedge block 82 to perform a compound motion.

[0027] When the threaded rod 71 rotates, the first bevel gear 831 fixed on it drives the second bevel gear 832 to rotate. The second bevel gear 832 transmits power to the internal transmission assembly 85 through the sleeve 84. The transmission rod 851 cooperates with the slot 853 on the inner wall of the sleeve 84 through the locking block 852, and can transmit torque while sliding in the sleeve 84. The power is transmitted to the fixed shaft 86 through the synchronous belt 854, driving the drive gear 87 on it to rotate.

[0028] The drive gear 87 meshes with the toothed plate 88 fixed on the top of the second wedge block 82, thereby driving the second wedge block 82 to reciprocate in a direction parallel to the inclined surface of the first wedge block 81 (i.e., the front-back direction in the figure). This allows the contact point of the two wedge blocks to change periodically, avoiding material fatigue and friction coefficient reduction caused by long-term static pressure contact, and maintaining high locking potential at all times.

[0029] Meanwhile, during the lifting and lowering process, the threaded tube 72 will drive the adjusting rod 8111 to move through the adjusting sleeve 8112 fixed on its surface. The adjusting rod 8111 pushes the first slide rail 810 and the entire second wedge block 82 assembly on it to move left and right along the second slide rail 814 fixed on the fixed frame 3. This ensures that the contact position between the second wedge block 82 and the first wedge block 81 on the inclined plane can automatically follow the lifting and lowering of the adjusting block 4 and maintain surface contact throughout the process without interference.

[0030] Once adjusted to the correct position, under the action of its own weight and the system preload, a huge static friction force is generated between the inclined contact surfaces of the second wedge block 82 and the first wedge block 81. This friction force needs to overcome the angle of the inclined surface to achieve relative sliding, thus forming a second strong friction lock in the vertical direction for the adjustment block 4 to rise and fall. The cleaning brush 10 installed on the second wedge block 82, under the action of the first spring 11, constantly cleans the inclined surface of the first wedge block 81, removes flying dust, and ensures the cleanliness of the contact surface and the stability of the friction coefficient. Example 3

[0031] Please see Figures 10-13 This is the third embodiment of the present invention, which is based on the first two embodiments.

[0032] Specifically, a third self-locking mechanism 9 is provided on the top left side of the adjusting block 4. The third self-locking mechanism 9 includes a slide rod 91 fixedly connected to the top left side of the adjusting block 4, a fixed sleeve 92 sleeved on the surface of the slide rod 91, and a friction plate 93 disposed inside the fixed sleeve 92. The friction plate 93 in the third self-locking mechanism (9) locks the slide rod 91, forming a third rigid locking. The third self-locking mechanism 9 also includes grooves 94 opened at the top and bottom of the fixed sleeve 92, a driving block 95 disposed in the inner cavity of the groove 94, a connecting rod 96 fixedly connected to one side of the driving block 95, a second spring 97 sleeved on the surface of the connecting rod 96, and a driving assembly 93 disposed on the surface of the fixed sleeve 92. 8. The other end of the connecting rod 96 is fixedly connected to the surface of the friction plate 93. The driving assembly 98 includes a driving cylinder 981 fixedly connected to the surface of the fixed sleeve 92, an electromagnetic ring 982 disposed at the top and bottom of the inner cavity of the driving cylinder 981, a metal disc 983 disposed in the inner cavity of the driving cylinder 981, a return spring 984 fixedly connected between the two metal discs 983, a driving plate 985 fixedly connected to one side of the metal disc 983, a slide rod 91 with a regular hexagonal cross-section, a fixed sleeve 92 fixedly connected to the inner side of the fixed frame 3, a sliding hole 13 adapted to the slide rod 91 on the top of the fixed frame 3, and six friction plates 93, which correspond to the six sides of the slide rod 91 respectively.

[0033] When the roller gap needs to be adjusted, the servo motor 6 starts and simultaneously energizes the electromagnetic ring 982 in the drive assembly 98. The electromagnetic ring 982 generates magnetic force, attracting the upper and lower metal discs 983 to move towards each other, compressing the reset spring 984. The metal discs 983 drive the drive plate 985 on their side to move to both sides, thereby releasing the pressure on the drive block 95. At this time, the pre-tightened second spring 97 is released, pushing the connecting rod 96 and the friction plate 93 to move outward, so that the friction plate 93 and the six sides of the slide rod 91 are completely disengaged, releasing all radial locking, and the slide rod 91 and the adjusting block 4 can rise and fall freely.

[0034] After adjustment, the electromagnetic ring 982 is de-energized, and the rebound force of the reset spring 984 pushes the upper and lower metal discs 983 and the drive plate 985 back to the center. The bottom post of the drive plate 985 presses into the corresponding inclined surface at the top of the drive block 95, generating an inward radial force that overcomes the elastic force of the second spring 97 and powerfully pushes the six friction plates 93 to converge towards the center, tightly gripping the regular hexagonal slide rod 91. Since the slide rod 91 is fixed to the adjustment block 4, this forms a third rigid, multi-point synchronous friction lock for the vertical movement of the adjustment block 4. This locking force is converted from electromagnetic force, which is powerful and controllable.

[0035] In summary, during operation, the present invention achieves the following: after the servo motor 6 drives and adjusts to the target pressure, the worm gear 74 and worm 73 self-lock to prevent the threaded pair from reversing; the wedge block's inclined surface friction self-lock provides significant vertical resistance; and the electromagnetically driven friction plate 93 locks the hexagonal rod to form a rigid stop. The triple locking mechanism is spatially parallel and functionally coordinated. The failure of any one mechanism does not affect the operation of the other two. Vibration energy needs to overcome these three parallel locking defenses simultaneously to cause pressure loosening, and the locking force is multiplied when they work together. This ensures that the roller pressure remains extremely constant under long-term high-speed and strong vibration conditions, thereby improving the drafting quality and operational reliability of the drawing frame.

[0036] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A self-locking structure for the roller pressure of a cotton spinning drawing frame, comprising a frame (1), a lower roller (2) rotatably connected to one side of the frame (1) via a bearing seat, a fixed frame (3) disposed on one side of the frame (1), an adjusting block (4) disposed in the inner cavity of the fixed frame (3), and an upper roller (5) rotatably connected to one side of the adjusting block (4) via a bearing seat, characterized in that: A servo motor (6) is fixedly connected to the top of the fixed frame (3), and a first self-locking mechanism (7) is provided on the inner side of the fixed frame (3). The first self-locking mechanism (7) includes a threaded rod (71) rotatably connected to the fixed frame (3) via a bearing seat, and a threaded tube (72) threadedly connected to the surface of the threaded rod (71). The first self-locking mechanism (7) performs the first mechanical locking on the adjusting block (4). The top of the adjusting block (4) is provided with a second self-locking mechanism (8). The second self-locking mechanism (8) includes a first wedge block (81) fixedly connected to the top of the adjusting block (4), and a second wedge block (82) in contact with the first wedge block (81). The wedge block in the second self-locking mechanism (8) is self-locked by friction of the inclined surface of the wedge block, forming a second friction lock. A third self-locking mechanism (9) is provided on the top left side of the adjusting block (4). The third self-locking mechanism (9) includes a slide rod (91) fixedly connected to the top left side of the adjusting block (4), a fixed sleeve (92) sleeved on the surface of the slide rod (91), and a friction plate (93) set inside the fixed sleeve (92). The friction plate (93) in the third self-locking mechanism (9) locks the slide rod (91) to form a third rigid locking.

2. The self-locking structure of the roller pressure of the cotton spinning drawing frame according to claim 1, characterized in that: The first self-locking mechanism (7) further includes a worm (73) fixedly connected to the output shaft of the servo motor (6), a worm wheel (74) meshing with the surface of the worm (73), the worm wheel (74) being fixedly connected to one end of the threaded rod (71) at its shaft center, and the threaded tube (72) being fixedly connected to one end of the adjusting block (4).

3. The self-locking structure of the roller pressure of the cotton spinning drawing frame according to claim 1, characterized in that: The second self-locking mechanism (8) further includes a bevel gear set (83) disposed on the surface of the threaded rod (71), a sleeve (84) fixedly connected to one side of the bevel gear set (83), a transmission assembly (85) disposed on one side of the sleeve (84), a fixed shaft (86) fixedly connected to one side of the transmission assembly (85), a drive gear (87) fixedly connected to the surface of the fixed shaft (86), a toothed plate (88) meshing with the surface of the drive gear (87), a first slide groove (89) opened on one side of the second wedge block (82), a first slide rail (810) slidably connected to the slide groove, an adjustment assembly (811) disposed on one side of the first slide rail (810), a mounting plate (812) fixedly connected to the top of the first slide rail (810), a second slide groove (813) opened on both sides of the first slide rail (810), and a second slide rail (814) slidably connected to the inner cavity of the second slide groove (813).

4. The self-locking structure of the roller pressure of the cotton spinning drawing frame according to claim 3, characterized in that: The bevel gear set (83) includes a first bevel gear (831) fixedly connected to the surface of the threaded rod (71), a second bevel gear (832) meshing with the surface of the first bevel gear (831), the shaft of the second bevel gear (832) being fixedly connected to the surface of the sleeve (84), and the surface of the sleeve (84) being rotatably connected to the inner side of the fixed frame (3) through a bearing seat.

5. The self-locking structure of the roller pressure of the cotton spinning drawing frame according to claim 3, characterized in that: The transmission assembly (85) includes a transmission rod (851) slidably connected to the inner cavity of the sleeve (84), a locking block (852) fixedly connected to the surface of the transmission rod (851), a locking groove (853) in the inner cavity of the sleeve (84) that is adapted to the locking block (852), a first synchronous pulley fixedly connected to the surface of the transmission rod (851), a synchronous belt (854) drivingly connected to the first synchronous pulley, and a second synchronous pulley drivingly connected to the first synchronous pulley through the synchronous belt (854). The shaft center of the second synchronous pulley is fixedly connected to the surface of the fixed shaft (86). The transmission rod (851) is rotatably connected to the inside of the mounting plate (812) through a bearing seat.

6. The self-locking structure of the roller pressure of the cotton spinning drawing frame according to claim 3, characterized in that: The adjustment assembly (811) includes an adjustment rod (8111) movably connected to the surface of the first slide rail (810), and an adjustment sleeve (8112) movably connected to the other end of the adjustment rod (8111). The inner side of the adjustment sleeve (8112) is fixedly connected to the surface of the threaded tube (72). One end of the fixed shaft (86) is rotatably connected to one side of the mounting plate (812) through a bearing seat. One side of the second slide rail (814) is fixedly connected to the inner side of the fixed frame (3). The toothed plate (88) is fixedly connected to the top of the second wedge block (82).

7. The self-locking structure of the roller pressure of the cotton spinning drawing frame according to claim 1, characterized in that: The second wedge block (82) has cleaning brushes (10) rotatably connected to both sides by pins. A first spring (11) is fixedly connected to one side of the cleaning brush (10), and a baffle (12) is fixedly connected to the other end of the first spring (11). One side of the baffle (12) is fixedly connected to one side of the second wedge block (82).

8. The self-locking structure of the roller pressure of the cotton spinning drawing frame according to claim 1, characterized in that: The third self-locking mechanism (9) further includes grooves (94) formed on the top and bottom of the fixed sleeve (92), a drive block (95) set in the inner cavity of the groove (94), a connecting rod (96) fixedly connected to one side of the drive block (95), a second spring (97) sleeved on the surface of the connecting rod (96), and a drive assembly (98) set on the surface of the fixed sleeve (92). The other end of the connecting rod (96) is fixedly connected to the surface of the friction plate (93).

9. The self-locking structure of the roller pressure of the cotton spinning drawing frame according to claim 8, characterized in that: The drive assembly (98) includes a drive cylinder (981) fixedly connected to the surface of the fixed sleeve (92), an electromagnetic ring (982) disposed at the top and bottom of the inner cavity of the drive cylinder (981), a metal disc (983) disposed in the inner cavity of the drive cylinder (981), a reset spring (984) fixedly connected between the two metal discs (983), and a drive plate (985) fixedly connected to one side of the metal disc (983).

10. The self-locking structure of the roller pressure of the cotton spinning drawing frame according to claim 1, characterized in that: The slide rod (91) has a regular hexagonal cross-section. The fixing sleeve (92) is fixedly connected to the inside of the fixing frame (3). The top of the fixing frame (3) is provided with a sliding hole (13) that matches the slide rod (91). There are six friction plates (93), which correspond to the six sides of the slide rod (91) respectively.

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