Detachable ball screw pair and dismounting method thereof

Abstract

The invention discloses a detachable ball screw pair and a detaching method thereof, and relates to the technical field of ball screw pairs, the detachable ball screw pair comprises a screw pair main body, a moving assembly is arranged outside the screw pair main body, the screw pair main body comprises a screw rod body, a screw rod groove is formed in the outer surface of the screw rod body, and a screw rod is arranged in the screw rod groove. A retaining part is arranged outside the screw rod body and comprises a first retaining frame and a second retaining frame, the first retaining frame and the second retaining frame are spliced to form a circle to wrap the screw rod body, a plurality of ball clamping grooves are formed in the surface of the first retaining frame and the surface of the second retaining frame, and the ball clamping grooves are matched with the first retaining frame and the second retaining frame. According to the scheme, the problems that most of retainers of an existing ball screw pair are directly arranged on a lead screw in a sleeving mode, the retainers need to be moved to the most edge during disassembly, the retainers can be disassembled only after a ball nut is disassembled firstly, and consequently the retainers are inconvenient to disassemble and replace are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of ball screw pairs, and specifically to a detachable ball screw pair and a disassembly method thereof. Background Art

[0002] ‌A ball screw pair is a precision transmission device composed of parts such as a screw, a nut, and balls. Its core function is to convert rotational motion into linear motion, or convert linear motion into rotational motion. For example, a ball screw pair solution is adopted in automotive braking. The spiral grooves of the screw and the nut are both Gothic double arc raceways. The balls are located between the screw and the nut as the transmission medium, transmitting the rotational motion of the screw to the nut to achieve the axial movement of the nut. There is a circulation device on the nut or the screw to realize the continuous rotation of the balls without detaching from the inside of the nut; For example, the Chinese authorized patent (ball screw pair) with the publication number CN207777556U: includes a nut, a cage, a screw, and balls. The screw is inserted into the nut. The cage is arranged between the nut and the screw. The cage is provided with a plurality of through holes. The balls are placed in the through holes and can roll in the raceway formed by the nut and the screw. The ball screw pair further includes: a limiting unit, which is arranged at both ends in the axial direction of the nut for limiting the cage between both ends in the axial direction of the nut. The ball screw pair of the present invention can perform reversible transmission, has high positioning accuracy and repeated positioning accuracy, and its processing and assembly are simpler and more convenient, and can be mass-produced automatically, which is suitable for industrial applications.

[0003] Most of the existing cages of ball screw pairs are directly sleeved on the screw. When disassembling, it needs to be moved to the outermost side, and the cage can only be disassembled after the ball nut is disassembled first, resulting in inconvenient disassembly and replacement of the cage. Therefore, we provide a detachable ball screw pair and a disassembly method thereof. Summary of the Invention

[0004] The purpose of the present invention is to provide a detachable ball screw pair and a disassembly method thereof, so as to solve the problem in the above-mentioned background art that most of the existing cages of ball screw pairs are directly sleeved on the screw. When disassembling, it needs to be moved to the outermost side, and the cage can only be disassembled after the ball nut is disassembled first, resulting in inconvenient disassembly and replacement of the cage.

[0005] To achieve the above object, the present invention provides the following technical solution: A detachable ball screw pair, including a screw pair main body, a moving component is arranged outside the screw pair main body, the screw pair main body includes a screw rod body, a screw groove is arranged on the outer surface of the screw rod body, a holding part is arranged outside the screw rod body, the holding part includes a first cage and a second cage, and the first cage and the second cage are spliced to form a circle to wrap the screw rod body.

[0006] Preferably, a plurality of ball card slots are arranged on the surfaces of the first cage and the second cage, a plurality of balls are embedded in the ball card slots, and a plurality of balls are arranged.

[0007] Preferably, connecting plate slots are arranged on the upper surfaces of the two ends of the first cage, a circular plate slot is arranged at one end of the connecting plate slot, and the circular plate slot is circular, and a central stabilizing seat is arranged at the center of the space formed by the circular plate slot and the connecting plate slot.

[0008] Preferably, connecting plug plates are arranged at the two ends of the second cage, a connecting circular plate is arranged at one end of the connecting plug plate, and the connecting plug plate and the connecting circular plate are respectively inserted into the connecting plate slot and the circular plate slot.

[0009] Preferably, a central stabilizing groove is arranged at the center of the connecting circular plate, and the central stabilizing groove is sleeved outside the central stabilizing seat. Screw grooves are arranged on the upper surfaces of the central stabilizing seat and the connecting circular plate. A fixing screw is inserted into the upper end of the screw groove, and one end of the fixing screw passes through the central stabilizing seat and is threadedly connected to the first cage, and the other end of the fixing screw presses down the connecting circular plate.

[0010] Preferably, the screw pair main body further includes connecting columns, and the connecting columns are located at both ends of the screw pair main body. A connecting head is arranged at one end of the connecting column. A plurality of connecting card slots are arranged on the outer surface of the connecting head, and a plurality of the connecting card slots are distributed equidistantly around the connecting head in an array.

[0011] Preferably, the moving component includes a first nut seat and a second nut seat. Nut moving grooves are arranged inside the first nut seat and the second nut seat, and the nut moving grooves penetrate through the first nut seat and the second nut seat. Ball moving grooves are arranged on the inner walls of the nut moving grooves, and the balls move along the ball moving grooves and the screw grooves. Stop pins are arranged at one ends of the ball moving grooves of the first nut seat and the second nut seat.

[0012] Preferably, a stable slot is provided on one side surface of the second nut seat, and the stable slot penetrates through the second nut seat. A through hole is provided on one side of the first nut seat, and the through hole penetrates through the first nut seat. Moreover, a plurality of stable slots and through holes are provided. A stable plug is provided on one end surface of the through hole, and the stable plug is inserted into the stable slot.

[0013] Preferably, a threaded rod is inserted into the other end of the through hole, and one end of the threaded rod penetrates through the first nut seat, the stable plug and the second nut seat. Hexagonal nuts are threadedly connected to both ends of the threaded rod.

[0014] Preferably, a disassembly method for a detachable ball screw pair includes the following steps: Step 1: Align the first cage and the second cage and sleeved them outside the screw rod body. Insert the connecting plug and the connecting circular plate into the connecting plate groove and the circular plate slot respectively, and fix them with fixing screws. Step 2: After fixing the first cage and the second cage, place the balls in alignment with the ball card slots one by one. Step 3: Align the first nut seat and the second nut seat, insert the stable plug into the stable slot, and initially fix the first nut seat and the second nut seat. Then, after one end of the threaded rod penetrates through the first nut seat, the stable plug and the second nut seat, hexagonal nuts are threadedly connected to both ends of the threaded rod for extrusion fixation to further fix the first nut seat and the second nut seat. Step 4: Then, put on the first nut seat and the second nut seat, and the balls move along the ball movement groove and the screw groove. When the first cage and the second cage and the balls run to the position of the stop pin, they are blocked and cannot move forward. Step 5: When the retaining part needs to be disassembled, first disassemble the first nut seat and the second nut seat. After removing the second nut seat, the first cage and the second cage can then be disassembled, without having to disassemble the ball screw every time and then move the falling movement component and the retaining part.

[0015] Compared with the prior art, the beneficial effects of the present invention are: (1) In the present invention, the existing integral cage is divided into a first cage and a second cage. When installing the first cage and the second cage, the connecting plug board and the connecting circular plate are respectively inserted into the connecting plate groove and the circular plate slot to achieve a limiting and strengthening effect, improving the connection stability between the first cage and the second cage. Then, fixing screws are used for fixation. Compared with the existing single use of screws for fixation, the use of the limiting structure and the fixing screws together makes it less likely to occur position deviation, and it is also convenient to disassemble the first cage and the second cage without moving and separating the holding part from the lead screw body, improving the disassembly convenience, and solving the problem that most of the cages of the existing ball screw pairs are directly sleeved on the lead screw, and when disassembling, it needs to be moved to the outermost side, and the cage can only be disassembled after removing the ball nut first, resulting in inconvenient disassembly and replacement of the cage.

[0016] (2) The moving component is composed of splicing the first nut seat and the second nut seat. When splicing the first nut seat and the second nut seat, the stable plug post is inserted into the stable slot to preliminarily fix the first nut seat and the second nut seat. Then, the external hexagonal nut of the threaded rod is used for extrusion fixation to further fix the first nut seat and the second nut seat, facilitating the disassembly of the moving component, and then disassembling the holding part, without having to disassemble the ball screw every time and then move and drop the moving component and the holding part, improving the disassembly convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the main structural schematic diagram of the lead screw pair of the present invention; Figure 3 is the structural schematic diagram of the holding part of the present invention; Figure 4 is the enlarged schematic diagram of the structure of part A of the present invention; Figure 5 is the disassembled structural schematic diagram of the moving component of the present invention; In the figure: 1. Lead screw pair main body; 2. Moving component; 3. Connecting column; 4. Lead screw body; 5. Lead screw groove; 6. Holding part; 7. First cage; 8. Second cage; 9. Ball card slot; 10. Ball; 11. Connecting plug board; 12. Connecting plate groove; 13. Connecting circular plate; 14. Circular plate slot; 15. Central stability groove; 16. Central stability seat; 17. Fixing screw; 18. Screw groove; 19. First nut seat; 20. Second nut seat; 21. Nut moving groove; 22. Ball moving groove; 23. Stop pin; 24. Stable slot; 25. Stable plug post; 26. Through hole; 27. Threaded rod; 28. Hexagonal nut; 29. Connecting head; 30. Connecting card slot. DETAILED DESCRIPTION OF THE INVENTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0019] Please refer to Figures 1-5 , an embodiment provided by the present invention: a detachable ball screw pair, including a screw pair main body 1. A moving component 2 is arranged outside the screw pair main body 1. The screw pair main body 1 includes a screw rod body 4. A screw groove 5 is arranged on the outer surface of the screw rod body 4. A holding part 6 is arranged outside the screw rod body 4. The holding part 6 includes a first cage 7 and a second cage 8. The first cage 7 and the second cage 8 are spliced to form a circle to wrap the screw rod body 4. Ball card slots 9 are arranged on the surfaces of the first cage 7 and the second cage 8, and a plurality of ball card slots 9 are provided. A ball 10 is embedded in the ball card slot 9, and a plurality of balls 10 are provided. Connecting plate slots 12 are arranged on the upper surfaces of both ends of the first cage 7. A circular plate slot 14 is arranged at one end of the connecting plate slot 12, and the circular plate slot 14 is circular. A central stabilizing seat 16 is arranged at the center of the space formed by the circular plate slot 14 and the connecting plate slot 12. Connecting plugs 11 are arranged at both edges of the second cage 8. A connecting circular plate 13 is arranged at one end of the connecting plug 11. The connecting plug 11 and the connecting circular plate 13 are respectively inserted into the connecting plate slot 12 and the circular plate slot 14. A central stabilizing groove 15 is arranged at the center of the connecting circular plate 13, and the central stabilizing groove 15 is sleeved outside the central stabilizing seat 16. Screw grooves 18 are arranged on the upper surfaces of the central stabilizing seat 16 and the connecting circular plate 13. A fixing screw 17 is inserted into the upper end of the screw groove 18. One end of the fixing screw 17 passes through the central stabilizing seat 16 and is threadedly connected to the first cage 7. And the other end of the fixing screw 17 presses down the connecting circular plate 13. When assembling the holding part, align the first cage 7 and the second cage 8 and sleeve them outside the screw rod body 4. By inserting the connecting plug 11 and the connecting circular plate 13 into the connecting plate slot 12 and the circular plate slot 14 respectively, the connection stability between the first cage 7 and the second cage 8 is improved; Then use the fixing screw 17 to fix. Compared with fixing only with screws, it is not easy to occur position deviation, and it is also convenient to disassemble the first cage 7 and the second cage 8 without moving and separating the holding part 6 from the screw rod body 4, improving the disassembly convenience and flexibility, and there is no need to disassemble the entire ball screw pair; The moving component 2 includes a first nut seat 19 and a second nut seat 20. Inside both the first nut seat 19 and the second nut seat 20, there is a nut moving groove 21, and the nut moving groove 21 penetrates through the first nut seat 19 and the second nut seat 20. The inner wall of the nut moving groove 21 is provided with a ball moving groove 22, and the balls 10 move along the ball moving groove 22 and the lead screw groove 5. At one end of the ball moving groove 22 of both the first nut seat 19 and the second nut seat 20, there is a stop pin 23. On one side surface of the second nut seat 20, there is a stable insertion slot 24, and the stable insertion slot 24 penetrates through the second nut seat 20. On one side of the first nut seat 19, there is a through hole 26, and the through hole 26 penetrates through the first nut seat 19. And there are multiple stable insertion slots 24 and through holes 26. On one end surface of the through hole 26, there is a stable insertion post 25, and the stable insertion post 25 is inserted into the stable insertion slot 24. At the other end of the through hole 26, a threaded rod 27 is inserted, and one end of the threaded rod 27 penetrates through the first nut seat 19, the stable insertion post 25, and the second nut seat 20. Both ends of the threaded rod 27 are threadedly connected with hex nuts 28. When installing the first nut seat 19 and the second nut seat 20, the stable insertion post 25 is inserted into the stable insertion slot 24, and the first nut seat 19 and the second nut seat 20 are initially fixed; Then, the first nut seat 19 and the second nut seat 20 are further fixed by extruding and fixing with the hex nut 28 externally connected to the threaded rod 27, which facilitates the disassembly of the moving component 2. Then, the holding part 6 is disassembled, realizing the detachable ball screw pair and improving the disassembly convenience.

[0020] Furthermore, the lead screw pair main body 1 further includes a connecting column 3, and the connecting column 3 is located at both ends of the lead screw pair main body 1. One end of the connecting column 3 is provided with a connecting head 29, and on the outer surface of the connecting head 29, there are multiple connecting card slots 30, and the multiple connecting card slots 30 are distributed equidistantly in an array around the connecting head 29.

[0021] Please refer to Figures 1-5 , a disassembly method for a detachable ball screw pair, including the following steps: Step 1: Align the first cage 7 and the second cage 8 and sleeved them outside the lead screw body 4, and insert the connecting plug board 11 and the connecting round plate 13 into the connecting plate groove 12 and the round plate insertion slot 14 respectively, and fix them with the fixing screws 17; Step 2: After fixing the first cage 7 and the second cage 8, place the balls 10 one by one in alignment with the ball card slots 9; Step 3: Align the first nut seat 19 and the second nut seat 20, insert the stable plug post 25 into the stable slot 24, and initially fix the first nut seat 19 and the second nut seat 20. Then, after one end of the threaded rod 27 passes through the first nut seat 19, the stable plug post 25, and the second nut seat 20, both ends of the threaded rod 27 are threadedly connected to the hexagon nuts 28 for extrusion fixation to further fix the first nut seat 19 and the second nut seat 20; Step 4: Then, put on the first nut seat 19 and the second nut seat 20. The balls 10 move along the ball moving grooves 22 and the lead screw grooves 5. When the first cage 7 and the second cage 8 and the balls 10 run to the position of the stop pins 23, they are blocked and cannot move forward; Step 5: When the holding part 6 needs to be disassembled, first disassemble the first nut seat 19 and the second nut seat 20. After removing the second nut seat 20, the first cage 7 and the second cage 8 can then be disassembled, without having to disassemble the ball screw every time and then move down the moving assembly 2 and the holding part 6.

[0022] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A detachable ball screw pair, comprising a screw pair body (1), characterized in that: A moving component (2) is arranged outside the screw sub-body (1), the screw sub-body (1) comprises a screw body (4), the outer surface of the screw body (4) is provided with a screw groove (5), and a retaining portion (6) is arranged outside the screw body (4), the retaining portion (6) comprises a first retaining frame (7) and a second retaining frame (8), and the first retaining frame (7) and the second retaining frame (8) are spliced ​​to form a circle to wrap the screw body (4).

2. A detachable ball screw pair according to claim 1, characterized in that: The surfaces of the first retaining frame (7) and the second retaining frame (8) are provided with ball retaining grooves (9), and a plurality of ball retaining grooves (9) are provided; balls (10) are embedded in the ball retaining grooves (9), and a plurality of balls (10) are provided.

3. A detachable ball screw pair according to claim 2, characterized in that: The upper surfaces of both end edges of the first retaining frame (7) are provided with connecting plate grooves (12), one end of the connecting plate groove (12) is provided with a circular plate slot (14), and the circular plate slot (14) is circular, and a central stabilizing seat (16) is provided at the center of the space formed by the circular plate slot (14) and the connecting plate groove (12).

4. A detachable ball screw pair according to claim 3, characterized in that: Both end edges of the second retaining frame (8) are provided with connecting plug plates (11), one end of the connecting plug plate (11) is provided with a connecting circular plate (13), and the connecting plug plate (11) and the connecting circular plate (13) are respectively inserted into the connecting plate groove (12) and the circular plate slot (14).

5. A detachable ball screw pair according to claim 4, characterized in that: A central stabilizing groove (15) is provided at the center of the connecting circular plate (13), and the central stabilizing groove (15) is sleeved on the outside of the central stabilizing seat (16). The upper surfaces of the central stabilizing seat (16) and the connecting circular plate (13) are both provided with screw grooves (18), and a fixing screw (17) is inserted into the upper end of the screw groove (18), and one end of the fixing screw (17) passes through the central stabilizing seat (16) and is threadedly connected to the first retaining frame (7), and the other end of the fixing screw (17) presses down the connecting circular plate (13).

6. A detachable ball screw pair according to claim 5, characterized in that: The screw sub-body (1) further comprises a connecting column (3), and the connecting column (3) is located at both ends of the screw sub-body (1), one end of the connecting column (3) is provided with a connecting head (29), the outer surface of the connecting head (29) is provided with a connecting slot (30), and there are a plurality of connecting slots (30), and the plurality of connecting slots (30) are distributed in an equidistant array around the connecting head (29).

7. A detachable ball screw pair according to claim 6, characterized in that: The moving assembly (2) comprises a first nut seat (19) and a second nut seat (20), wherein the first nut seat (19) and the second nut seat (20) are both provided with a nut moving groove (21) inside, and the nut moving groove (21) penetrates the first nut seat (19) and the second nut seat (20), the inner wall of the nut moving groove (21) is provided with a ball moving groove (22), and the ball (10) moves along the ball moving groove (22) and the screw groove (5), and a stop pin (23) is provided at one end of the ball moving groove (22) of the first nut seat (19) and the second nut seat (20).

8. A detachable ball screw pair according to claim 7, characterized in that: A stabilizing slot (24) is provided on one side surface of the second nut seat (20), and the stabilizing slot (24) passes through the second nut seat (20); a through hole (26) is provided on one side of the first nut seat (19), and the through hole (26) passes through the first nut seat (19); and a plurality of stabilizing slots (24) and through holes (26) are provided; a stabilizing column (25) is provided on one end surface of the through hole (26), and the stabilizing column (25) is inserted into the stabilizing slot (24).

9. A detachable ball screw pair according to claim 8, characterized in that: A threaded rod (27) is inserted into the other end of the through hole (26), and one end of the threaded rod (27) passes through the first nut seat (19), the stabilizing column (25) and the second nut seat (20), and both ends of the threaded rod (27) are threadedly connected to the hexagonal nuts (28).

10. A method for disassembling a detachable ball screw pair, based on the detachable ball screw pair according to claim 9, characterized in that: The following steps are involved: Step 1: Align the first retaining frame (7) and the second retaining frame (8) and sleeve them onto the outside of the lead screw body (4), and insert the connecting plug plate (11) and the connecting circular plate (13) into the connecting plate groove (12) and the circular plate slot (14) respectively, and fix them with fixing screws (17); Step 2: After fixing the first retaining frame (7) and the second retaining frame (8), align the balls (10) one by one with the ball slots (9); Step 3: The first nut seat (19) and the second nut seat (20) are aligned, the stabilizing column (25) is inserted into the stabilizing slot (24), the first nut seat (19) and the second nut seat (20) are initially fixed, and then one end of the threaded rod (27) passes through the first nut seat (19), the stabilizing column (25) and the second nut seat (20), and both ends of the threaded rod (27) are threadedly connected to the hexagonal nuts (28) for extrusion and fixing, so as to further fix the first nut seat (19) and the second nut seat (20); Step 4: Then, the first nut seat (19) and the second nut seat (20) are put on, and the ball (10) moves along the ball moving groove (22) and the screw groove (5). When the first retaining frame (7) and the second retaining frame (8) and the ball (10) move to the position of the stop pin (23), they are blocked and cannot move forward. Step 5: When it is necessary to disassemble the retaining portion (6), first disassemble the first nut seat (19) and the second nut seat (20). After removing the second nut seat (20), the first retaining frame (7) and the second retaining frame (8) can be disassembled. It is not necessary to disassemble the ball screw each time before moving the drop moving assembly (2) and the retaining portion (6).

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