An automatic assembly tool for roller screw

Abstract

The present application relates to the technical field of roller screw assembly, in particular to an automatic assembly tool for roller screw, comprising a base and two assembly seats symmetrically arranged on the base, each assembly seat movably arranged with an assembly frame and a linkage mechanism drivingly connected with the assembly frame, the assembly frame being capable of switching between a loading state and an assembly state under the drive of the linkage mechanism, the present application symmetrically arranging the assembly seats capable of moving towards or away from each other on the base, and configuring the assembly frame capable of switching postures on each assembly seat, so that the loading station and the assembly station of the roller are completed in the same mechanism, avoiding the disturbance of the roller caused by the axial separation or overall disassembly of the positioning tool in the prior art, effectively improving the stability and reliability of the assembly process.

Description

Technical Field

[0001] This invention relates to the field of roller screw assembly technology, specifically to an automated assembly fixture for roller screws. Background Technology

[0002] A roller screw is a transmission component that uses multiple rollers rolling between a screw and a nut to achieve the conversion between linear and rotary motion. Because the contact between the rollers and raceways is line contact, its load-bearing capacity, rigidity, and service life are significantly higher than those of traditional ball screws. Therefore, it is widely used in CNC machine tools, high-end equipment, and heavy-duty actuators—applications requiring high transmission performance. The internal structure of a roller screw is intricate, and its assembly quality directly affects its operational smoothness, positioning accuracy, and long-term reliability. The posture and number distribution of the rollers within the nut, as well as the assembly preload, are all key control factors.

[0003] Under current production conditions, the assembly process of roller screws remains a weak link in the manufacturing process. In existing technologies, roller assembly mostly relies on manual or semi-automatic tooling, typically requiring rollers to be inserted one by one into the assembly slot or using auxiliary sleeves for positioning. This method is highly dependent on the operator's skill level, has low assembly efficiency, and when there are many rollers, problems such as roller tilting, uneven spacing, or rollers falling off during assembly are prone to occur, affecting the final assembly accuracy. Although some automated assembly equipment has introduced positioning structures, its roller loading and assembly stations are usually separated. After loading, it is necessary to switch stations through axial extraction or complex conversion mechanisms. This not only requires a large assembly space but also easily disturbs the already positioned rollers during the switching process, increasing the risk of assembly failure. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides an automated assembly fixture for roller screws.

[0005] The present invention adopts the following technical solution: an automated assembly fixture for a roller screw, comprising a base and two assembly seats symmetrically arranged on the base;

[0006] Each of the assembly bases is movably equipped with an assembly frame and a linkage mechanism that is drively connected to the assembly frame. The assembly frame can switch between a loading state and an assembly state under the drive of the linkage mechanism.

[0007] The assembly frame is equipped with a roller positioning mechanism, which is used to position and constrain multiple rollers.

[0008] When the assembly frame is in the loading state, its opening faces upward to facilitate roller loading and positioning; when in the assembly state, its opening is horizontal.

[0009] After the rollers complete the loading and positioning, when the two assembly frames are driven to approach each other synchronously in opposite directions, the linkage mechanism synchronously drives the assembly frames to switch from the loading state to the assembly state during the process of the assembly frames approaching each other, so that the two assembly frames are set relative to each other in the assembly state, and the corresponding roller positioning mechanisms form a coaxial or quasi-coaxial mating structure, so that multiple rollers are evenly distributed along the circumferential direction for the assembly of nuts.

[0010] As a further description of the above technical solution: the assembly frame includes a movable seat, a rotating seat and two arc-shaped frames. A second slider is welded to the lower surface of the movable seat. The second slider is slidably connected to a second groove opened on the upper surface of the assembly seat. An electric telescopic rod is fixed to one end of the second groove, and the movable end of the electric telescopic rod is fixedly connected to the second slider.

[0011] The rotating seat is rotatably connected to the movable seat via a shaft. A connecting seat is fixed on the rotating seat. The two arc-shaped frames are welded and fixed at both ends along the length of one side wall of the connecting seat to bear and support the roller positioning mechanism.

[0012] As a further description of the above technical solution: the linkage mechanism includes two transmission racks and arc-shaped gear rings that cooperate with them. The two transmission racks are welded and fixed to the upper surface of the mounting base and are symmetrically distributed with the movable base as the center. The two arc-shaped gear rings are welded and fixed to the connecting base and respectively mesh with the corresponding transmission racks.

[0013] When the movable seat moves along the second slide groove under the drive of the electric telescopic rod, the arc-shaped gear ring meshes and rolls relative to the transmission rack, thereby driving the rotating seat to rotate around its axis, realizing the synchronous switching of the assembly frame posture.

[0014] As a further description of the above technical solution: the roller positioning mechanism includes two positioning blocks arranged in parallel to each other and two positioning seats that cooperate with the positioning blocks. Two parallel linkage racks are welded and fixed at both ends of the upper surface of the two positioning blocks along the length direction. The linkage racks extend outward respectively. The two positioning seats are respectively located on the outer side of the positioning blocks. Each positioning seat has a limiting groove for accommodating the linkage rack. The linkage rack is slidably connected to the corresponding limiting groove, thereby guiding and limiting the movement direction of the linkage rack. A gear disk is rotatably connected to the positioning seat through a connecting shaft. The gear disk is located between the two linkage racks and is meshed with the two corresponding linkage racks respectively.

[0015] As a further description of the above technical solution: the automated assembly fixture for the roller screw also includes a drive mechanism and a transmission mechanism disposed between two adjacent roller positioning mechanisms.

[0016] As a further description of the above technical solution: the transmission mechanism includes a concave connecting frame and a convex connecting frame, which are rotatably connected to the positioning blocks in two adjacent sets of roller positioning mechanisms;

[0017] One end of the concave connecting frame and the convex connecting frame are rotatably connected by a connecting shaft. Two connecting rods are rotatably connected to both ends of the connecting shaft, and the other ends of the two connecting rods are rotatably connected to a fixed shaft.

[0018] As a further description of the above technical solution: the driving mechanism includes a driving block and a hydraulic telescopic rod, wherein the fixed shaft is inserted into and fixed on the driving block, the hydraulic telescopic rod is installed on the connecting seat, and the movable end of the hydraulic telescopic rod is fixedly connected to the driving block for driving the driving block to generate reciprocating linear motion.

[0019] As a further description of the above technical solution: a strip groove is formed on the center line along the length direction of the upper surface of the base, and two mounting seats are slidably connected in the strip groove. A bidirectional lead screw is rotatably connected in the strip groove, and the bidirectional lead screw is threadedly connected to the two mounting seats. A lead screw motor is installed at one end of the bidirectional lead screw, and the bidirectional lead screw is driven to rotate by the lead screw motor, thereby causing the two mounting seats to move closer to each other synchronously in opposite directions or move away from each other in opposite directions.

[0020] As a further description of the above technical solution: a first sliding groove is provided on both side walls of the strip groove along its length direction, and a first slider is welded on the mounting base, the first slider being slidably connected to the first sliding groove.

[0021] As a further description of the above technical solution: grooves are provided at both ends of the two side walls along the length direction of the base, and bolt holes are provided through the bottom plate inside the grooves. The bolt holes are used to cooperate with fixing bolts to complete the positioning and fixing of the base.

[0022] Beneficial effects:

[0023] This invention symmetrically arranges assembly seats that can move towards or away from each other on the base, and configures an assembly frame that can switch postures on each assembly seat, so that the loading station and assembly station of the roller can be converted within the same mechanism. This avoids the roller disturbance problem caused by the need to pull out or disassemble the positioning tooling along the axis in the prior art, and effectively improves the stability and reliability of the assembly process.

[0024] Secondly, under the action of the linkage mechanism, the assembly rack of the present invention can realize the synchronous switching from the loading state with the opening facing upward to the assembly state with the assembly base moving relative to each other. This structure utilizes the transmission conversion relationship between linear motion and rotational motion to complete the posture adjustment without adding an additional drive source. The structure is compact and the control logic is simple, which is conducive to improving the overall integration and operational stability of the equipment.

[0025] Furthermore, by controlling the synchronous separation of the two positioning blocks, the roller positioning mechanism can be directly disengaged from the roller after both ends of the roller are fixed, without the need for axial pull-out. This radially separated release method significantly reduces the dependence on axial space, avoids interference during assembly in confined spaces, and is more suitable for the actual assembly conditions of roller screws. Moreover, this invention allows the roller positioning mechanism to be completely removed after both ends of the roller are fixed, ensuring that the roller remains in a controlled and stable positioning state throughout the entire assembly process. This helps to ensure the assembly consistency between the roller and the nut and reduces accuracy deviations caused by mid-process release or repeated positioning. Attached Figure Description

[0026] The present invention will be further explained below with reference to the accompanying drawings and embodiments:

[0027] Figure 1 This is a schematic diagram of the structure of an automated assembly fixture for a roller screw provided in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the connection between the assembly base and the assembly frame provided in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of the movable seat provided in an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the connection structure between the assembly frame and the roller positioning mechanism provided in an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the assembly rack provided in an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the transmission mechanism provided in an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the roller positioning mechanism provided in an embodiment of the present invention;

[0034] Figure 8 This is a schematic diagram of the positioning block provided in an embodiment of the present invention.

[0035] Explanation of reference numerals in the attached drawings: 1. Base; 11. Groove; 12. Bolt hole; 13. Strip groove; 14. Double-acting lead screw; 15. Lead screw motor; 16. First slide groove; 17. First slider; 2. Assembly seat; 3. Assembly frame; 31. Movable seat; 32. Rotary seat; 33. Arc frame; 34. Second slider; 35. Second slide groove; 36. Electric telescopic rod; 37. Connecting seat; 4. Linkage mechanism; 41. Transmission rack; 42. Arc gear ring; 5. Roller positioning mechanism; 51. Positioning block; 52. Positioning seat; 53. Linkage rack; 54. Gear disk; 6. Transmission mechanism; 61. Concave connecting frame; 62. Convex connecting frame; 63. Connecting rod; 64. Fixed shaft; 7. Drive mechanism; 65. Drive block; 66. Hydraulic telescopic rod. Detailed Implementation

[0036] To make the technical means, creative features, objectives, and effects of this invention readily understandable, the invention is further described below with reference to specific illustrations. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0037] Example 1

[0038] Please see Figures 1-5 The present invention provides a technical solution: an automated assembly fixture for a ball screw, including a base 1 and two assembly seats 2 symmetrically arranged on the base 1. Each assembly seat 2 is movably provided with an assembly frame 3 and a linkage mechanism 4. The assembly frame 3 is mounted on the corresponding assembly seat 2 by rotation, and the linkage mechanism 4 is connected to the corresponding assembly frame 3 for driving the assembly frame 3 to switch between different work positions.

[0039] The assembly rack 3 has at least two working states, including a loading state with the opening facing upward and an assembly state with the opening in the horizontal direction. In the loading state, the opening of the roller positioning mechanism 5 is set to face upward so that the rollers can be put in from above in sequence and complete the initial positioning.

[0040] The assembly frame 3 is equipped with a roller positioning mechanism 5, which is used to constrain the position and limit the attitude of the rollers in multiple roller screws, so that each roller maintains a relatively independent and stable state before assembly.

[0041] After the roller completes the loading and positioning in the roller positioning mechanism 5, it drives the assembly frames 3 on the two assembly seats 2 to move closer in opposite directions. During this relative approach, the linkage mechanism 4 drives the corresponding assembly frame 3 to switch from the loading state to the assembly state, so that the opening direction of the assembly frame 3 gradually changes from vertical upward to horizontal.

[0042] When the assembly is completed, the two assembly racks 3 on the two assembly seats 2 move away from each other in opposite directions and return to the loading station. The linkage mechanism 4 synchronously drives the corresponding assembly rack 3 to switch from the assembly state to the loading state.

[0043] In the assembly state, the two assembly frames 3 are arranged opposite each other, and their respective roller positioning mechanisms 5 form a coaxial mating structure in space, thereby driving multiple rollers fixed on the roller positioning mechanism 5 to be distributed at equal intervals along the circumferential direction, forming a complete roller array for nut assembly, realizing the automated assembly of the nut and the roller screw.

[0044] The base 1 has grooves 11 at both ends of its two side walls along its length. Bolt holes 12 are formed through the bottom plate inside the grooves 11. The bolt holes 12 are used to cooperate with fixing bolts to complete the positioning and fixing of the base 1.

[0045] A strip groove 13 is formed on the center line along the length direction on the upper surface of the base 1. Two mounting seats 2 are slidably connected in the strip groove 13. A bidirectional lead screw 14 is rotatably connected in the strip groove 13 and threadedly connected to the two mounting seats 2. A lead screw motor 15 is installed at one end of the bidirectional lead screw 14. The bidirectional lead screw 14 is driven to rotate by the lead screw motor 15, thereby causing the two mounting seats 2 to move closer to each other synchronously in opposite directions or move away from each other in opposite directions.

[0046] Furthermore, the strip groove 13 has a first sliding groove 16 on both sides along its length, and a first slider 17 is welded on the mounting base 2. The first slider 17 is slidably connected to the first sliding groove 16.

[0047] The assembly frame 3 consists of a movable seat 31, a rotating seat 32 and two arc-shaped frames 33. A second slider 34 is welded to the lower surface of the movable seat 31. The second slider 34 is slidably connected to the second slide groove 35 opened on the upper surface of the assembly seat 2. An electric telescopic rod 36 is fixed to one end of the second slide groove 35, and the movable end of the electric telescopic rod 36 is fixedly connected to the second slider 34.

[0048] The rotating seat 32 is rotatably connected to the movable seat 31 via a shaft. A connecting seat 37 is fixed on the rotating seat 32. Two arc-shaped frames 33 are welded and fixed at both ends along the length of one side wall of the connecting seat 37 to bear and support the roller positioning mechanism 5.

[0049] The linkage mechanism 4 includes two transmission racks 41 and arc-shaped gear rings 42 that cooperate with them. The two transmission racks 41 are welded and fixed to the upper surface of the mounting base 2 and are symmetrically distributed with the movable base 31 as the center. The two arc-shaped gear rings 42 are welded and fixed to the connecting base 37 and respectively mesh with the corresponding transmission racks 41.

[0050] When the movable seat 31 moves along the second slide groove 35 under the drive of the electric telescopic rod 36, the arc-shaped toothed ring 42 engages and rolls relative to the transmission rack 41, thereby driving the rotating seat 32 to rotate around its axis, realizing the synchronous switching of the posture of the assembly frame 3.

[0051] Specifically, the electric telescopic rod 36 drives the movable seat 31 to generate linear displacement. The linear displacement is converted into the rotational motion of the rotating seat 32 through the meshing relationship between the transmission rack 41 and the arc-shaped gear ring 42. Thus, without adding an additional drive source, the assembly rack 3 can automatically switch from the loading state to the assembly state.

[0052] In this embodiment, the present invention symmetrically arranges assembly seats 2 that can move towards or away from each other on the base 1, and configures an assembly frame 3 that can switch postures on each assembly seat 2, so that the loading station and assembly station of the roller can be converted in the same mechanism, avoiding the roller disturbance problem caused by the need to pull out along the axial direction or disassemble the positioning tooling as a whole in the prior art, and effectively improving the stability and reliability of the assembly process.

[0053] Secondly, under the action of the linkage mechanism 4, the assembly frame 3 of the present invention can realize the synchronous switching from the loading state with the opening facing upward to the assembly state in the horizontal direction while the assembly base 2 moves relative to it. This structure utilizes the transmission conversion relationship between linear motion and rotational motion to complete the posture adjustment without adding an additional drive source. The structure is compact and the control logic is simple, which is conducive to improving the overall integration and operational stability of the equipment.

[0054] Example 2

[0055] Please see Figures 6-8 Based on the above embodiments, this embodiment further discloses the specific structure of the roller positioning mechanism 5;

[0056] The roller positioning mechanism 5 includes two positioning blocks 51 arranged in parallel to each other and two positioning seats 52 that cooperate with the positioning blocks 51. The two positioning blocks 51 are arranged in parallel to each other, and two parallel linkage racks 53 are welded and fixed at both ends of their upper surfaces along the length direction. The linkage racks 53 extend outwards respectively. The two positioning seats 52 are respectively located on the outer side of the positioning blocks 51. Each positioning seat 52 has a limiting groove for accommodating the linkage racks 53. The linkage racks 53 are slidably connected to the corresponding limiting grooves, thereby guiding and limiting the movement direction of the linkage racks 53. A gear disk 54 is rotatably connected to the positioning seat 52 through a connecting shaft. The gear disk 54 is located between the two linkage racks 53, and the gear disk 54 is meshed with the corresponding two linkage racks 53 respectively.

[0057] Specifically, during the roller assembly process, when any positioning block 51 is repositioned under external force, the linkage rack 53 fixedly connected to it slides linearly along the limiting groove in the positioning seat 52. The linear motion of the linkage rack 53 is converted into the rotational motion of the gear disk 54 through its meshing with the gear disk 54. Since the gear disk 54 is simultaneously meshed with two linkage racks 53, the rotation of the gear disk 54 synchronously drives the other linkage rack 53 to produce an equal and opposite linear displacement, thereby driving the corresponding other positioning block 51 to move synchronously. Through the above structure, the linkage adjustment between the two positioning blocks 51 is realized, so that they always maintain a parallel and symmetrical motion state during the movement.

[0058] The roller positioning mechanism 5 also includes a drive mechanism 7 and a transmission mechanism 6 disposed between two adjacent roller positioning mechanisms 5.

[0059] The transmission mechanism 6 includes a concave connecting frame 61 and a convex connecting frame 62, which are rotatably connected to the positioning blocks 51 in two adjacent sets of roller positioning mechanisms 5.

[0060] One end of the concave connecting bracket 61 and the convex connecting bracket 62 are rotatably connected by a connecting shaft. Two connecting rods 63 are rotatably connected to both ends of the connecting shaft, and the other ends of the two connecting rods 63 are rotatably connected to a fixed shaft 64.

[0061] The drive mechanism 7 includes a drive block 65 and a hydraulic telescopic rod 66. The fixed shaft 64 is inserted into and fixed on the drive block 65. The hydraulic telescopic rod 66 is installed on the connecting seat 37. The movable end of the hydraulic telescopic rod 66 is fixedly connected to the drive block 65 and is used to drive the drive block 65 to generate reciprocating linear motion.

[0062] Specifically, during the assembly process, when the hydraulic telescopic rod 66 extends or retracts, its movable end drives the drive block 65 to reciprocate linearly in a predetermined direction. The linear motion of the drive block 65 is transmitted to the two connecting rods 63 through the fixed shaft 64 inserted thereon. The connecting rods 63 swing synchronously at the connecting shaft, thereby driving the concave connecting frame 61 and the convex connecting frame 62 to rotate around their rotational connection points with the corresponding positioning block 51. Since the concave connecting frame 61 and the convex connecting frame 62 act on two adjacent sets of roller positioning mechanisms 5 respectively, the above transmission path can synchronously distribute the driving force of a single hydraulic telescopic rod 66 to the adjacent roller positioning mechanisms 5, realizing the coordinated adjustment of multiple sets of roller positioning mechanisms 5.

[0063] By cooperating with the transmission mechanism 6 and the drive mechanism 7, a single hydraulic telescopic rod 66 can drive multiple sets of roller positioning mechanisms 5 to move synchronously, reducing the number of drive sources and improving system integration.

[0064] Compared with the existing technology where the roller is positioned by inserting into the circumferentially set assembly groove at the end of the auxiliary assembler, this embodiment uses two parallel positioning blocks 51 to position the roller. Through the cooperation of the linkage rack 53 and the gear disk 54, the two positioning blocks 51 can adjust their positions synchronously and symmetrically, thereby achieving clamping positioning of the roller. This positioning method does not rely on a fixed assembly groove structure. The roller does not need to be forcibly embedded in the groove during the assembly process, which effectively reduces the risk of jamming, scratching or local stress concentration during assembly and disassembly, and improves the smoothness and stability of roller positioning.

[0065] Secondly, this application differs fundamentally from existing technologies in its disassembly method. In existing technologies, the release of the rollers relies on the axial removal of the auxiliary assembler. However, this application controls the synchronous separation of the two positioning blocks 51, allowing the roller positioning mechanism 5 to directly detach from the rollers after both ends are fixed, without the need for axial removal. This radially separated release method significantly reduces dependence on axial space, avoids interference during assembly in confined spaces, and is more suitable for the actual assembly conditions of roller screws. Furthermore, this invention allows the roller positioning mechanism 5 to be completely removed after both ends of the rollers are fixed, ensuring that the rollers remain in a controlled and stable positioning state throughout the assembly process. This helps ensure the assembly consistency between the rollers and the nut and reduces accuracy deviations caused by mid-process release or repeated positioning.

[0066] This invention enables a single drive source to achieve synchronous operation of multiple sets of roller positioning mechanisms 5 through the cooperation of transmission mechanism 6 and drive mechanism 7. Positioning, adjustment and release during the assembly process can be centrally controlled, which significantly reduces the number of drive components and control complexity, and improves the overall assembly efficiency and automation level.

[0067] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended scope and its equivalents.

Claims

1. An automated assembly fixture for a roller screw, comprising a base (1) and two assembly seats (2) symmetrically arranged on the base (1), characterized in that: Each of the assembly bases (2) is movably provided with an assembly frame (3) and a linkage mechanism (4) that is connected to the assembly frame (3) in a transmission manner. The assembly frame (3) can switch between the loading state and the assembly state under the drive of the linkage mechanism (4). The assembly frame (3) consists of a movable seat (31), a rotating seat (32) and two arc-shaped frames (33). A second slider (34) is welded to the lower surface of the movable seat (31). The second slider (34) is slidably connected to a second slide groove (35) opened on the upper surface of the assembly seat (2). An electric telescopic rod (36) is fixed to one end of the second slide groove (35), and the movable end of the electric telescopic rod (36) is fixedly connected to the second slider (34). The assembly frame (3) is provided with a roller positioning mechanism (5), which is used to position and constrain multiple rollers. The roller positioning mechanism (5) includes two positioning blocks (51) arranged in parallel to each other and two positioning seats (52) cooperating with the positioning blocks (51). Two parallel linkage racks (53) are welded and fixed at both ends of the upper surface of the two positioning blocks (51) along the length direction. The linkage racks (53) extend outward respectively. The two positioning seats (52) are respectively located on the outer side of the positioning blocks (51). Each positioning seat (52) has a limiting groove for accommodating the linkage racks (53). The linkage racks (53) are slidably connected to the corresponding limiting grooves, thereby guiding and limiting the movement direction of the linkage racks (53). A gear disk (54) is rotatably connected to the positioning seat (52) through a connecting shaft. The gear disk (54) is located between the two linkage racks (53), and the gear disk (54) is meshed with the corresponding two linkage racks (53). When the assembly frame (3) is in the loading state, its opening faces upward to facilitate roller loading and positioning; In the assembled state, its opening is horizontal; After the rollers complete the loading and positioning, when the two assembly frames (3) are driven to approach each other synchronously in opposite directions, the linkage mechanism (4) synchronously drives the assembly frame (3) to switch from the loading state to the assembly state during the process of the assembly frame (3) approaching each other, so that the two assembly frames (3) are set relative to each other in the assembly state, and the corresponding roller positioning mechanism (5) forms a coaxial or quasi-coaxial mating structure, so that multiple rollers are distributed at equal intervals along the circumferential direction for the assembly of nuts.

2. The automated assembly fixture for a roller screw according to claim 1, characterized in that, The rotating seat (32) is rotatably connected to the movable seat (31) via a shaft. A connecting seat (37) is fixed on the rotating seat (32). Two arc-shaped frames (33) are welded and fixed at both ends along the length of one side wall of the connecting seat (37) to carry and support the roller positioning mechanism (5).

3. The automated assembly fixture for a roller screw according to claim 2, characterized in that, The linkage mechanism (4) includes two transmission racks (41) and an arc-shaped gear ring (42) that cooperates with them. The two transmission racks (41) are welded and fixed to the upper surface of the assembly base (2) and are symmetrically distributed with the movable base (31) as the center. The two arc-shaped gear rings (42) are welded and fixed to the connecting base (37) and respectively mesh with the corresponding transmission racks (41). When the movable base (31) moves along the second slide groove (35) under the drive of the electric telescopic rod (36), the arc-shaped gear ring (42) meshes and rolls relative to the transmission racks (41), thereby driving the rotating base (32) to rotate around its axis, realizing the synchronous switching of the posture of the assembly frame (3).

4. The automated assembly fixture for a roller screw according to claim 2, characterized in that, The roller positioning mechanism (5) also includes a drive mechanism (7) and a transmission mechanism (6) disposed between two adjacent roller positioning mechanisms (5).

5. The automated assembly fixture for a roller screw according to claim 4, characterized in that, The transmission mechanism (6) includes a concave connecting frame (61) and a convex connecting frame (62), which are rotatably connected to the positioning blocks (51) in two adjacent sets of roller positioning mechanisms (5); One end of the concave connecting frame (61) and the convex connecting frame (62) are rotatably connected by a connecting shaft. Two connecting rods (63) are rotatably connected to both ends of the connecting shaft, and the other ends of the two connecting rods (63) are rotatably connected to a fixed shaft (64).

6. The automated assembly fixture for a roller screw according to claim 5, characterized in that, The drive mechanism (7) includes a drive block (65) and a hydraulic telescopic rod (66). The fixed shaft (64) is inserted into and fixed on the drive block (65). The hydraulic telescopic rod (66) is installed on the connecting seat (37). The movable end of the hydraulic telescopic rod (66) is fixedly connected to the drive block (65) and is used to drive the drive block (65) to generate reciprocating linear motion.

7. The automated assembly fixture for a roller screw according to claim 1, characterized in that, The base (1) has a strip groove (13) on the center line along the length direction on the upper surface. The two mounting seats (2) are slidably connected in the strip groove (13). A double-acting screw (14) is rotatably connected in the strip groove (13). The double-acting screw (14) is threadedly connected to the two mounting seats (2). A screw motor (15) is installed at one end of the double-acting screw (14). The double-acting screw (14) is driven to rotate by the screw motor (15), thereby causing the two mounting seats (2) to move closer to each other in opposite directions or move away from each other in opposite directions.

8. The automated assembly fixture for a roller screw according to claim 7, characterized in that, The strip groove (13) has a first sliding groove (16) on both sides along its length direction. The mounting base (2) has a first slider (17) welded on it. The first slider (17) is slidably connected to the first sliding groove (16).

9. The automated assembly fixture for a roller screw according to claim 1, characterized in that, The base (1) has grooves (11) at both ends of its two side walls along its length. Bolt holes (12) are provided through the bottom plate inside the grooves (11). The bolt holes (12) are used to cooperate with the fixing bolts to complete the positioning and fixing of the base (1).

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