Ball screw pair and sealing structure

Abstract

The present application provides a ball screw pair and sealing structure, relating to the field of ball screw pairs. The structure comprises: a screw having a threaded groove, a nut having a mating groove and threadedly engaged with the screw, and a plurality of balls. The threaded groove and the mating groove have the same lead. The balls are arranged rollingly between the threaded groove and the mating groove, and the nut is threadedly engaged with the screw via the balls. The end wall of the nut is provided with a connecting tube, the inner wall of which is provided with a receiving groove. A sealing sleeve is provided on the screw and fixed to the inner wall of the receiving groove. A ring plate is provided in the receiving groove and the ring plate cover is provided on the sealing sleeve. A pressing mechanism is provided on the ring plate for pressing the sealing sleeve to fit the inner wall of the threaded groove. The present application has the effect of preventing the sealing effect between the nut and the screw from being reduced due to wear of the sealing sleeve.

Description

Technical Field

[0001] The present application relates to the field of ball screw pairs, and in particular to a ball screw pair and a sealing structure. Background Art

[0002] A ball screw, also known as a ball screw pair or ball screw pair, consists of a screw and a nut. A ball screw pair is a helical transmission element with balls as rolling elements between the screw and the nut. It can convert rotational motion into linear motion, or vice versa. Therefore, a ball screw pair serves as both a transmission element and a conversion element between linear and rotational motion.

[0003] At present, in the relevant technology, the Chinese patent with the authorization announcement number CN212480039U discloses a ball screw pair, which includes a linear screw shaft and a cylindrical nut screwed with the screw shaft. The outer peripheral surface of the screw shaft is a continuous smooth surface, and an annular cavity seat is formed on each of the two axial inner diameter side ends of the nut. A sealing assembly with an overall ring shape is installed in the annular cavity seat. When the screw shaft rotates, the sealing part of the sealing assembly is always tightly fitted with the outer peripheral surface of the screw shaft to achieve a sealed connection.

[0004] The sealing assembly includes a first fixed ring, a sealing ring and a second fixed ring. The first fixed ring is adapted to the annular concave seat. The first fixed ring is provided with an annular groove. The sealing ring and the second fixed ring are just accommodated in the annular groove. The sealing ring is pressed between the groove bottom of the annular groove and the inner shaft end face of the second fixed ring. The outer shaft end face of the second fixed ring is flush with the notch plane of the annular groove. The inner circumference of the first fixed ring and the inner circumference of the second fixed ring are clearance-matched with the outer circumference of the screw shaft. The sealing ring serves as the sealing part of the sealing assembly, and its inner circumference is interference-fitted with the outer circumference of the screw shaft. The advantage is that the sealing part of the sealing assembly can scrape the grease on the outer circumference of the screw shaft clean, eliminating the phenomenon of grease flying around under centrifugal force. In addition, the sealing part of the sealing assembly can well seal the gap between the nut and the screw shaft, protecting the nut and the screw shaft from the intrusion of dust and the like, and more effectively preventing the leakage of excess grease in the nut.

[0005] However, the screw shaft is generally exposed directly to the outside, and as time goes by, the surface of the screw shaft tends to become rough and easily accumulate a certain amount of dust. Therefore, when the nut moves on the screw shaft subsequently, the sealing ring tends to wear too quickly, resulting in a reduction in the sealing effect between the nut and the screw shaft. Summary of the Invention

[0006] In order to improve the problem that the sealing ring is prone to wear too quickly, thereby reducing the sealing effect between the nut and the screw shaft, the present application provides a ball screw pair and a sealing structure.

[0007] In a first aspect, the present application provides a sealing structure, which adopts the following technical solution:

[0008] A sealing structure comprises: a lead screw having a thread groove, a nut having a matching groove and screwed with the lead screw, and a plurality of steel balls, wherein the lead of the thread groove and the matching groove are the same, the steel balls are rollingly arranged between the thread groove and the matching groove, and the nut is screwed with the lead screw through the steel balls, the end wall of the nut is provided with a connecting tube, the inner wall of the connecting tube is provided with an accommodating groove, a sealing sleeve is provided on the lead screw and the sealing sleeve is fixed to the inner wall of the accommodating groove, a ring plate is provided in the accommodating groove and the ring plate cover is provided on the sealing sleeve, and a pressing mechanism is provided on the ring plate for squeezing the sealing sleeve to fit the inner wall of the thread groove.

[0009] By adopting the above technical solution, the pressing mechanism can squeeze any section of the sealing sleeve into a circle of thread groove, so that the sealing sleeve is tightly attached to the inner wall of the thread groove, thereby effectively improving the sealing between the nut and the screw; if the sealing sleeve is worn, the pressing mechanism can be used again to further squeeze the sealing sleeve, so that the sealing sleeve can maintain tight contact with the inner wall of the thread groove to ensure the sealing between the nut and the screw.

[0010] Optionally, a cavity is provided inside the ring plate, and the pressing mechanism includes: a pressing assembly, and the pressing assembly includes: a pressing plate, a pressure rod, a pressure charging plate and a rubber block, the pressure charging plate is slidably provided in the cavity, one end of the pressure rod is provided in the cavity and is fixed to the pressure charging plate, and the other end passes through the ring plate and is fixed to the pressing plate, the pressing plate presses the sealing sleeve against the inner wall of the threaded groove, and the rubber block is fixed to the end of the pressing plate.

[0011] By adopting the above technical solution, air can be filled into the cavity to increase the air pressure in the cavity, thereby pushing the pressure charging plate toward the sealing sleeve until the sealing sleeve is tightly attached to the inner wall of the thread groove, thereby effectively improving the sealing between the nut and the screw.

[0012] Optionally, a clearance hole is provided on the side wall of the connecting tube and the clearance hole is connected to the accommodating groove, an air inlet cavity is provided inside the ring plate and the air inlet cavity is connected to the cavity, a connecting block is fixedly provided on the ring plate and the connecting block is provided in the clearance hole, an air inlet hole and an air outlet hole are provided on the connecting block, and the air inlet hole and the air outlet hole both extend to the ring plate and are connected to the air inlet cavity, the pressing mechanism also includes: a charging component, the charging component includes: an air nozzle and a rubber plug, the air nozzle is fixedly provided in the air inlet hole, and the rubber plug is provided in the air outlet hole.

[0013] By adopting the above technical solution, the air nozzle is convenient for inflating the air inlet cavity, and on the other hand, it can ensure sufficient air pressure in the air inlet cavity for a period of time; the rubber plug can prevent the gas inside the air inlet cavity from leaking out from the air outlet.

[0014] Optionally, the pressing assembly further includes: a rubber sleeve, which is fixedly mounted on the pressure charging plate and abuts against the inner wall of the cavity.

[0015] By adopting the above technical solution, the rubber sleeve can improve the sealing between the pressurized plate and the inner wall of the cavity to ensure that the pressurized plate can be pushed to move.

[0016] Optionally, the pressing assembly further includes: a return spring, wherein the return spring is fixed between the pressure charging plate and the inner wall of the cavity.

[0017] By adopting the above technical solution, the rubber plug is pulled out from the air outlet so that the air inlet cavity is consistent with the external air pressure, and the charging plate will be reset by the reset spring so that the pressing plate can be completely separated from the sealing sleeve.

[0018] Optionally, a sliding hole is provided on the inner side wall of the give way hole, a slider is slidably connected in the sliding hole, and the slider is fixed to the connecting block, a plurality of adjustment holes are provided on the inner wall of the sliding hole, the spacing between adjacent adjustment holes is equal to the spacing between adjacent thread grooves, and a locking assembly is provided between the slider and any one of the adjustment holes.

[0019] By adopting the above technical solution, once the portion of the sealing sleeve that is in close contact with the inner wall of the thread groove is worn too severely, the locking assembly can be released so that the ring plate can be moved to the adjacent adjustment hole; then the locking assembly is locked again, and a new section of the sealing sleeve is pressed against the inner wall of the thread groove through the pressing mechanism, thereby ensuring the sealing effect between the nut and the screw.

[0020] Optionally, a placement hole is provided on the slider, and the locking assembly includes: a locking rod and a locking spring, one end of the locking rod is arranged in the placement hole, and the other end is arranged in the adjustment hole, the locking spring is fixed between the locking rod and the bottom of the placement hole, and an inclined guide surface is provided at one end of the locking rod away from the locking spring, and the guide surface is close to one end of the locking spring and is lower than the opening of the adjustment hole.

[0021] By adopting the above technical solution, a person manually pushes the connecting block hard, and the locking rod will retract into the placement hole through the guide surface, thereby releasing the lock so that the ring plate can move to the adjacent adjustment hole; then the locking rod will automatically be inserted into the reselected adjustment hole through the thrust of the locking spring to achieve the locking effect.

[0022] Optionally, a sleeve is provided at one end of the connecting tube away from the nut, a spiral strip is fixedly provided on the inner wall of the sleeve, a cleaning cloth is fixedly provided on the spiral strip, and the cleaning cloth fits against the inner wall of the threaded groove.

[0023] By adopting the above technical solution, the cleaning cloth can first clean the dust on the surface of the screw, so that the sealing sleeve is not easily in contact with the dust, thereby extending the service life of the sealing sleeve.

[0024] Optionally, the nut and the end wall of the connecting pipe are both fixedly provided with ring blocks, the end walls of the connecting pipe and the sleeve are both provided with threaded holes, and the ring blocks are threadedly connected to the corresponding threaded holes.

[0025] By adopting the above technical solution, the connecting pipe and the sleeve can be easily disassembled, thereby facilitating the replacement of the sealing sleeve and the cleaning cloth.

[0026] In a second aspect, the present application also provides a steel ball screw pair having the above-mentioned sealing structure.

[0027] By adopting the above technical solution, the sealing between the nut and the lead screw can be greatly improved.

[0028] In summary, this application has at least one of the following beneficial effects:

[0029] 1. If the sealing sleeve is worn, the pressing mechanism can be used again to further squeeze the sealing sleeve so that the sealing sleeve can maintain close contact with the inner wall of the thread groove to ensure the sealing between the nut and the screw.

[0030] 2. The air nozzle facilitates the inflation of air into the air inlet cavity and ensures sufficient air pressure in the air inlet cavity for a period of time. The rubber plug prevents the gas inside the air inlet cavity from leaking out from the air outlet.

[0031] 3. The cleaning cloth can first clean the dust on the surface of the screw, so that the sealing sleeve is not easy to come into contact with dust, thereby extending the service life of the sealing sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic perspective view of a ball screw pair and a sealing structure according to one embodiment of the present application;

[0033] Figure 2 yes Figure 1 A schematic side view of

[0034] Figure 3 It is along Figure 2 A schematic cross-sectional view taken along the cutting line AA in FIG.

[0035] Figure 4 yes Figure 3 Schematic partial enlarged view at B in the middle;

[0036] Figure 5 yes Figure 1 A schematic side view of

[0037] Figure 6 It is along Figure 5 A schematic cross-sectional view taken along the cutting line CC in FIG.

[0038] Figure 7 yes Figure 6 Schematic partial enlarged view at D in the middle.

[0039] In the figure: 1. screw; 11. threaded groove; 12. sealing sleeve; 2. nut; 21. matching groove; 22. ring block; 3. ball; 4. connecting pipe; 41. threaded hole; 42. accommodating groove; 43. clearance hole; 44. sliding hole; 45. adjusting hole; 46. sleeve; 461. spiral strip; 4611. cleaning cloth; 5. ring plate; 51. cavity; 52. air inlet cavity; 53. connecting block; 531. air inlet hole; 532. air outlet hole; 54. slider; 541. placement hole; 6. pressing assembly; 61. pressing plate; 62. pressing rod; 63. charging plate; 65. rubber sleeve; 66. reset spring; 7. charging assembly; 71. air nozzle; 72. rubber plug; 8. locking assembly; 81. locking rod; 811. guide surface; 82. locking spring. DETAILED DESCRIPTION

[0040] Figure 1 is a schematic perspective view of a ball screw pair and a sealing structure according to one embodiment of the present application; Figure 2 yes Figure 1 A schematic side view of Figure 3 It is along Figure 2 Schematic cross-sectional view taken along the cutting line AA in FIG. Figure 1 、 Figure 2 and Figure 3 A sealing structure may generally include: a screw 1 having a thread groove 11, a nut 2 having a matching groove 21 and screwed with the screw 1, and a plurality of balls 3. In the embodiment of the present application, the lead of the thread groove 11 and the matching groove 21 are the same, the balls 3 are rollingly arranged between the thread groove 11 and the matching groove 21, and the nut 2 is screwed with the screw 1 through the balls 3.

[0041] Figure 4 yes Figure 3 Schematic partial enlarged view of point B in the figure. Figure 4The end wall of the nut 2 is provided with a connecting tube 4, and the inner wall of the connecting tube 4 is provided with an annular receiving groove 42 along its own axial direction. A sealing sleeve 12 is provided on the screw 1, and the two ends of the sealing sleeve 12 are respectively glued and fixed to the inner side walls of the receiving groove 42. In the embodiment of the present application, the sealing sleeve 12 can be made of rubber material. The sealing sleeve 12 is used to improve the sealing between the screw 1 and the nut 2, so that external dust is not easy to enter between the screw 1 and the nut 2.

[0042] See also Figure 4 A ring plate 5 is provided in the accommodating groove 42 and the ring plate 5 is covered on the sealing sleeve 12. A pressing mechanism is provided on the ring plate 5. The pressing mechanism can squeeze any section of the sealing sleeve 12 into the thread groove 11, so that the sealing sleeve 12 is tightly attached to the inner wall of the thread groove 11, thereby effectively improving the sealing between the nut 2 and the screw 1; if the sealing sleeve 12 is worn, the pressing mechanism can be used to further squeeze the sealing sleeve 12, so that the sealing sleeve 12 can maintain tight contact with the inner wall of the thread groove 11 to ensure the sealing between the nut 2 and the screw 1.

[0043] See also Figure 4 Two cavities 51 are provided inside the ring plate 5, and the two cavities 51 are symmetrically arranged around the axis of the ring plate 5. The pressing mechanism includes a pressing component 6 and a pressurizing component 7. In the embodiment of the present application, the pressing components 6 are provided in two groups, one of which corresponds to one cavity 51 and the other corresponds to the other cavity 51.

[0044] See also Figure 4 The pressing assembly 6 includes: a pressing plate 61, a pressure rod 62, a pressure plate 63, a rubber block, a rubber sleeve 65 and a return spring 66. The pressure plate 63 is slidably arranged in the cavity 51. The rubber sleeve 65 is fixedly sleeved on the side wall of the pressure plate 63 and is tightly pressed against the inner wall of the cavity 51. The rubber sleeve 65 can improve the sealing between the pressure plate 63 and the inner wall of the cavity 51.

[0045] See also Figure 4 One end of the pressure rod 62 is arranged in the cavity 51 and is fixed to the pressure plate 63, and the other end passes through the ring plate 5 and extends to the inner circle of the ring plate 5 and is fixed to the pressure plate 61. The rubber block is fixed to the end of one end of the pressure plate 61 and the pressure plate 61 presses the sealing sleeve 12 against the inner wall of the thread groove 11. In the embodiment of the present application, the two pressure plates 61 are staggered so that when the two pressure plates 61 are pressed together, they can wrap around the thread groove 11 and the rubber blocks at the ends of one end of the two pressure plates 61 contact each other, thereby completely pressing the sealing sleeve 12 into a circle of the thread groove 11; and the cross-section of the pressure plate 61 is arc-shaped, so that the curvature of the thread groove 11 matches.

[0046] Figure 5 yes Figure 1 A schematic side view of Figure 6 It is along Figure 5 A schematic cross-sectional view taken along the cutting line CC in FIG. Figure 7 yes Figure 6 Schematic partial enlarged view of D in the middle. Figure 5 、 Figure 6 and Figure 7 The outer wall of the connecting pipe 4 is provided with a clearance hole 43 along its own axial direction, and the clearance hole 43 is connected to the accommodating groove 42. A connecting block 53 is provided in the clearance hole 43, and the connecting block 53 is fixed to the ring plate 5.

[0047] See also Figure 4 and Figure 7 An arc-shaped air inlet cavity 52 is provided inside the ring plate 5, with one end of the air inlet cavity 52 communicating with one of the cavities 51 and the other end communicating with the other cavity 51. An air inlet hole 531 and an air outlet hole 532 are formed on the end wall of the connecting block 53 away from the ring plate 5. Both the air inlet hole 531 and the air outlet hole 532 extend into the ring plate 5 and communicate with the air inlet cavity 52.

[0048] See also Figure 7 The charging assembly 7 includes an air nozzle 71 and a rubber plug 72. The air nozzle 71 is fixedly mounted in the air inlet 531. In the embodiment of the present application, the air nozzle 71 can be the air nozzle 71 used in everyday basketballs. The air nozzle 71 facilitates the charging of air into the air inlet chamber 52 and ensures sufficient air pressure in the air inlet chamber 52 for a period of time. The rubber plug 72 is inserted into the air outlet 532 with an interference fit, which prevents the air inside the air inlet chamber 52 from leaking out through the air outlet 532.

[0049] During use, the air needle can be inserted into the air nozzle 71, and then an air pump or air cylinder can be used to inject air into the air inlet chamber 52. The air in the air inlet chamber 52 also continuously enters the cavity 51. As the air pressure in the cavity 51 continues to increase, the pressure charging plate 63 drives the pressure rod 62 to move closer to the sealing sleeve 12 until the rubber blocks 64 at the ends of the two pressing plates 61 come into contact, thereby pressing either end of the sealing sleeve 12 against the inner wall of the thread groove 11 to improve the sealing between the nut 2 and the lead screw 1.

[0050] If the portion of the sealing sleeve 12 that contacts the inner wall of the thread groove 11 is worn, air can be further inflated into the air inlet chamber 52 to increase the air pressure in the cavity 51, thereby pushing the two pressing plates 61 to abut tighter, that is, further compressing the rubber block, so that even if the sealing sleeve 12 is worn, it is still squeezed to fit tightly against the inner wall of the thread groove 11, thereby continuing to ensure the sealing between the nut 2 and the screw 1.

[0051] See also Figure 7A sliding hole 44 is formed on the inner sidewall of the clearance hole 43 along its length. A slider 54 is slidably connected to the sliding hole 44. The slider 54 is fixed to the connecting block 53 to drive the ring plate 5 to slide along the length of the sliding hole 44. A plurality of adjustment holes 45 are formed on the inner sidewall of the sliding hole 44 along its length. The spacing between adjacent adjustment holes 45 is equal to the spacing between adjacent thread grooves 11.

[0052] See also Figure 7 A locking assembly 8 is disposed between the slider 54 and any one of the adjustment holes 45 . A placement hole 541 is defined on the side of the slider 54 away from the connecting block 53 . The locking assembly 8 includes a locking rod 81 and a locking spring 82 . One end of the locking rod 81 is disposed within the placement hole 541 , and the other end is disposed within the adjustment hole 45 . One end of the locking spring 82 is secured to the end wall of the locking rod 81 away from the adjustment hole 45 , and the other end is secured to the bottom of the placement hole 541 . The locking spring 82 is used to push the locking rod 81 into the adjustment hole 45 .

[0053] See also Figure 7 The end of the locking rod 81 away from the locking spring 82 is provided with an inclined guide surface 811, and the end of the guide surface 811 away from the locking spring 82 is inclined downward, and the end of the guide surface 811 close to the locking spring 82 is higher than the opening of the adjustment hole 45. Once the portion of the sealing sleeve 12 that is in close contact with the inner wall of the thread groove 11 is severely worn, the connecting block 53 can be pushed forcefully. At this time, the locking rod 81 will retract into the placement hole 541 through the guide surface 811, thereby releasing the lock, allowing the ring plate 5 to move to the adjacent adjustment hole 45; then, the locking rod 81 will be automatically inserted into the newly selected adjustment hole 45 by the thrust of the locking spring 82 to achieve the locking effect; finally, the new section of the sealing sleeve 12 can be pressed against the inner wall of the thread groove 11 by the pressing mechanism, thereby ensuring the sealing effect between the nut 2 and the screw 1.

[0054] See also Figure 4 In addition, one end of the return spring 66 is fixed to the side of the charging plate 63 away from the pressure rod 62, and the other end is fixed to the end of the cavity 51 away from the screw 1. Before driving the connecting block 53 to slide, the rubber plug 72 can be pulled out from the air outlet 532 to make the air inlet cavity 52 consistent with the external air pressure, and the charging plate 63 will be reset by the return spring 66, so that the pressure plate 61 is completely separated from the sealing sleeve 12, and the sealing sleeve 12 will also slowly restore its deformation, thereby driving the connecting block 53 to slide again.

[0055] See also Figure 3A ring block 22 is fixedly provided on the end wall of the nut 2 near one end of the connecting pipe 4, and a threaded hole 41 is opened on the end wall of the connecting pipe 4 near one end of the nut 2, and the ring block 22 is threadedly connected to the threaded hole 41. When the sealing sleeve 12 needs to be replaced, the connecting pipe 4 can be unscrewed from the nut 2, and the sealing sleeve 12 can be torn off from the accommodating groove 42 for replacement.

[0056] See also Figure 4 Furthermore, a sleeve 46 is provided on the end wall of the connecting pipe 4 away from the nut 2, and a ring block 22 is also fixedly provided on the end wall of the connecting pipe 4 away from the nut 2. A threaded hole 41 is also provided on the end wall of the sleeve 46 close to the connecting pipe 4. The ring block 22 on the connecting pipe 4 is threadedly connected to the threaded hole 41 on the sleeve 46, thereby facilitating the disassembly of the sleeve 46.

[0057] The inner wall of the sleeve 46 is fixedly provided with a spiral strip 461, which is aligned with the thread groove 11. A cleaning cloth 4611 is wrapped around the spiral strip 461 and is in contact with the inner wall of the thread groove 11. When the nut 2 moves on the screw 1, the cleaning cloth 4611 can first clean dust on the surface of the screw 1, thereby preventing the sealing sleeve 12 from coming into contact with dust and extending the service life of the sealing sleeve 12.

[0058] The working principle of the ball screw pair and sealing structure of the present application when in use is as follows: if the part of the sealing sleeve 12 that contacts the inner wall of the threaded groove 11 is worn, air can be continuously inflated into the air inlet chamber 52 to increase the air pressure in the cavity 51, thereby pushing the two pressing plates 61 to abut tighter, that is, further compressing the rubber block 64, so that even if the sealing sleeve 12 is worn, it is still squeezed to be tightly attached to the inner wall of the threaded groove 11, so as to continue to ensure the sealing between the nut 2 and the screw 1.

[0059] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A sealing structure, characterized in that: include: A screw (1) having a thread groove (11), a nut (2) having a matching groove (21) and screwed with the screw (1), and a plurality of balls (3), wherein the thread groove (11) and the matching groove (21) have the same lead, the balls (3) are rollingly arranged between the thread groove (11) and the matching groove (21), and the nut (2) is screwed with the screw (1) through the balls (3), and the end wall of the nut (2) is provided with a connecting tube ( 4), a receiving groove (42) is provided on the inner wall of the connecting tube (4), a sealing sleeve (12) is sleeved on the lead screw (1), and the sealing sleeve (12) is fixed to the inner wall of the receiving groove (42), a ring plate (5) is provided in the receiving groove (42), and the ring plate (5) is covered on the sealing sleeve (12), and a pressing mechanism is provided on the ring plate (5) for squeezing the sealing sleeve (12) to fit with the inner wall of the thread groove (11); A cavity (51) is provided inside the ring plate (5), and the pressing mechanism includes: a pressing assembly (6), and the pressing assembly (6) includes: a pressing plate (61), a pressure rod (62), a pressure plate (63) and a rubber block, the pressure plate (63) is slidably provided in the cavity (51), one end of the pressure rod (62) is provided in the cavity (51) and is fixed to the pressure plate (63), and the other end passes through the ring plate (5) and is fixed to the pressing plate (61), the pressing plate (61) presses the sealing sleeve (12) against the inner wall of the threaded groove (11), and the rubber block is fixed to the end of the pressing plate (61); The side wall of the connecting pipe (4) is provided with a clearance hole (43) and the clearance hole (43) is communicated with the accommodating groove (42); an air inlet cavity (52) is provided inside the ring plate (5) and the air inlet cavity (52) is communicated with the cavity (51); a connecting block (53) is fixedly provided on the ring plate (5) and the connecting block (53) is provided in the clearance hole (43); an air inlet hole (531) and The air outlet hole (532) is provided, and the air inlet hole (531) and the air outlet hole (532) both extend to the ring plate (5) and are in communication with the air inlet cavity (52). The pressing mechanism further comprises: a charging component (7), the charging component (7) comprising: an air nozzle (71) and a rubber plug (72), the air nozzle (71) being fixedly arranged in the air inlet hole (531), and the rubber plug (72) being arranged in the air outlet hole (532); The pressing assembly (6) further includes: a rubber sleeve (65), the rubber sleeve (65) being fixedly mounted on the pressure-charging plate (63) and abutting against the inner wall of the cavity (51); The pressing assembly (6) further includes: a return spring (66), wherein the return spring (66) is fixed between the pressure-charging plate (63) and the inner wall of the cavity (51); The inner wall of the displacement hole (43) is provided with a sliding hole (44), a slider (54) is slidably connected in the sliding hole (44), and the slider (54) is fixed to the connecting block (53), and the inner wall of the sliding hole (44) is provided with a plurality of adjustment holes (45), the spacing between adjacent adjustment holes (45) is equal to the spacing between adjacent thread grooves (11), and a locking assembly (8) is provided between the slider (54) and any one of the adjustment holes (45).

2. The sealing structure according to claim 1, wherein: The slider (54) is provided with a placement hole (541). The locking assembly (8) comprises a locking rod (81) and a locking spring (82). One end of the locking rod (81) is arranged in the placement hole (541), and the other end is arranged in the adjustment hole (45). The locking spring (82) is fixed between the locking rod (81) and the bottom of the placement hole (541). An inclined guide surface (811) is provided at one end of the locking rod (81) away from the locking spring (82), and the guide surface (811) is lower than the opening of the adjustment hole (45) at one end close to the locking spring (82).

3. The sealing structure according to claim 1, wherein: A sleeve (46) is provided at one end of the connecting tube (4) away from the nut (2), a spiral strip (461) is fixedly provided on the inner wall of the sleeve (46), a cleaning cloth (4611) is fixedly provided on the spiral strip (461), and the cleaning cloth (4611) is in contact with the inner wall of the threaded groove (11).

4. The sealing structure according to claim 3, characterized in that: A ring block (22) is fixedly provided on the end wall of the nut (2) close to one end of the connecting pipe (4); a threaded hole (41) is provided at one end of the connecting pipe (4) and a ring block (22) is also fixedly provided at the other end; a threaded hole (41) is also provided on the end wall of the sleeve (46); and the ring block (22) is threadedly connected to the corresponding threaded hole (41).

5. A ball screw pair having the sealing structure according to any one of claims 1 to 4.

Images