Large-load roller screw

Abstract

The large-load roller lead screw comprises a base and symmetrical mounting plates, the middles of the symmetrical mounting plates are jointly in transmission connection with a lead screw, the outer wall of the lead screw is in transmission connection with a first nut and a second nut, and the outer wall of the first nut and the outer wall of the second nut are jointly provided with a nut seat. An annular groove is formed in an inner cavity of the nut seat, an adjusting mechanism used for driving the second nut to move horizontally is arranged in an inner cavity of the annular groove, and when the adjusting mechanism rotates, the second nut is intermittently and horizontally away from or close to the position where the first nut is located. Through the intermittent transmission arrangement of the incomplete gear and the adjusting gear ring, the pre-tightening force between the first nut and the second nut can be conveniently and accurately adjusted, the pre-tightening force can be conveniently and accurately adjusted according to different weights of goods, the loading capacity of the ball screw is improved, and meanwhile the loading capacity of the ball screw is improved. And the situation that the service life of the ball screw is greatly shortened due to the fact that the ball is abraded too much due to too large pre-tightening force is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transmission devices, in particular to a large-load roller screw. BACKGROUND

[0002] A ball screw is a kind of precision transmission component for converting rotary motion into linear motion or vice versa, which has the characteristics of high transmission efficiency, high positioning accuracy and long service life, and is widely used in the fields of numerical control machine tools, automation equipment, precision instruments, robots, etc., and is composed of a screw rod, a nut, balls and a circulating device.

[0003] In the prior art, when adjusting the pre-tightening force of the threaded pre-tightening type double-nut ball screw, the nut with external threads needs to be manually rotated to adjust the relative position of the two nuts, and a locking nut is used for fixation. This results in difficulty in quickly and accurately adjusting the pre-tightening force to an appropriate level during adjustment. In addition, after long-term use, the locking nut may become loose due to vibration, thereby changing the pre-tightening force of the ball screw and affecting the transmission process. SUMMARY

[0004] The purpose of the present application is to provide a large-load roller screw to solve the problems raised in the background.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions: A large-load roller screw includes a base and symmetrical mounting plates. A screw is drivingly connected to the middle part of the symmetrical mounting plates. A first nut and a second nut are drivingly connected to the outer wall of the screw. A nut seat is provided on the outer wall of the first nut and the second nut. An annular groove is formed in the inner cavity of the nut seat. An adjusting mechanism for driving the second nut to move horizontally is arranged in the inner cavity of the annular groove. When the adjusting mechanism rotates, the second nut intermittently moves away from or approaches the position of the first nut.

[0006] As a further solution of the present application, the lower end of the symmetrical mounting plates is fixedly connected to the middle part of the upper end of the base. A servo motor is drivingly connected to the middle part of one side of the upper end of the base. The output end of the servo motor is drivingly connected to the screw. Symmetrical guide rails are fixedly connected to the upper end of the base.

[0007] As a further solution of the present application, a moving block is slidingly connected to the outer wall of the guide rail. Symmetrical sliding grooves are formed in the upper end of the moving block. A bracket is slidingly connected to the middle part of the upper end of the moving block. The lower end of the outer wall of the bracket is slidingly connected to the inner cavity of the sliding groove. A hydraulic rod is drivingly connected to the middle part of the upper end of the moving block. The output end of the hydraulic rod is fixedly connected to the bracket.

[0008] As a further scheme of the present application: the upper end of the symmetric support is fixedly connected with a stage, the middle of the lower end of the stage is fixedly connected with symmetric driven blocks, the middle of the upper end of the nut seat is fixedly connected with a driving block, the top of the driving block is below the plane of the lower end of the stage, the plane of the lower end of the driven block is higher than the plane of the upper end of the nut seat.

[0009] As a further scheme of the present application: the adjusting mechanism comprises an adjusting ring, the adjusting ring is threadedly connected with the second nut, the side of the first nut away from the second nut is fixedly connected with a fixed plate, the fixed plate is fixedly connected with the nut seat through bolts, and the middle of the outer wall of the adjusting ring is fixedly connected with an adjusting gear ring.

[0010] As a further scheme of the present application: the middle of the upper end of the ring-shaped groove is provided with a mounting groove, the inner cavity of the mounting groove is transmissionally connected with a driving motor near the side of the first nut, the output end of the driving motor is fixedly connected with an incomplete gear, and the incomplete gear is meshed with the adjusting gear ring.

[0011] As a further scheme of the present application: the two sides of the ring-shaped groove are provided with positioning mechanisms, the positioning mechanisms comprise vertical grooves, the vertical grooves are provided in the inner cavity of the nut seat away from the first nut, the distance between the symmetric vertical grooves is greater than the width of the ring-shaped groove, the inner cavity of the ring-shaped groove is provided with a recess near the side of the vertical groove in the middle, the inner cavity of the recess is horizontally slidably connected with a clamping block, and the end of the clamping block is clamped and matched with the adjusting gear ring.

[0012] As a further scheme of the present application: the inner cavity of the vertical groove is vertically slidably connected with a U-shaped plate, the upper end of the U-shaped plate is fixedly connected with a connecting plate near the side of the second nut, the height of the U-shaped plate is greater than the height of the inner cavity of the vertical groove, the top of the nut seat is provided with a U-shaped groove slidably matched with the U-shaped plate, the inner cavity of the U-shaped plate is fixedly connected with a fixed block, and the upper end of the fixed block and the top of the inner cavity of the vertical groove are elastically connected through a spring.

[0013] As a further scheme of the present application: the middle of the side of the clamping block away from the adjusting gear ring is fixedly connected with symmetric driven rods, the width of the clamping block is the same as the width of the inner cavity of the U-shaped plate, the inner cavity side wall of the U-shaped plate is provided with symmetric limiting grooves, the lower end of the limiting groove is provided with a guide groove, the lower end of the guide groove is provided with a positioning groove, and the outer wall of the side of the driven rod away from the clamping block is slidably matched with the limiting groove, the guide groove and the positioning groove.

[0014] As a further scheme of the present application: the horizontal distance between the two ends of the guide groove is greater than the length of the clamping block penetrating into the inner cavity of the ring-shaped groove through the recess, the vertical height of the limiting groove is the same as the vertical height of the positioning groove, and the vertical height of the positioning groove is greater than the vertical height of the driven rod.

[0015] Compared with the prior art, the present application has the following advantages: By the arrangement of the support and the object table, the weight of the goods can be shared to the moving block, so that the ball screw only needs to overcome the increased frictional resistance when the moving block moves horizontally with the weight of the object table carrying the goods increasing, thereby improving the maximum weight that the ball screw can bear and the load capacity of the ball screw; by the intermittent transmission of the incomplete gear and the adjusting tooth ring, the pre-tightening force between the first nut and the second nut can be conveniently and accurately adjusted, the pre-tightening force can be accurately adjusted according to the different weights of the goods, the load capacity of the ball screw is improved, and the pre-tightening force is prevented from being too large to cause excessive wear of the ball, thereby greatly reducing the service life of the ball screw; under the cooperation of the driven rod and the limiting groove, the position of the clamping block in the horizontal direction is limited, so that the clamping block always clamps and limits the adjusting tooth ring, and the clamping block will not shake in the horizontal direction due to vibration during movement, so as to change the pre-tightening force and the load capacity of the ball screw. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0017] Figure 2 It is a schematic diagram of the structure of the object table in the present application.

[0018] Figure 3 It is a schematic diagram of the structure of the A area in the present application. Figure 2

[0019] Figure 4 It is a schematic diagram of the structure of the nut seat in the present application.

[0020] Figure 5 It is a schematic diagram of the internal structure of the nut seat in the present application.

[0021] Figure 6 It is a schematic diagram of the structure of the adjusting ring in the present application.

[0022] Figure 7 It is a schematic diagram of the structure of the adjusting mechanism in the present application.

[0023] Figure 8 It is a schematic diagram of the structure of the B area in the present application. Figure 7

[0024] Figure 9 It is a schematic diagram of the structure of the C area in the present application. Figure 7

[0025] Figure 10 It is a schematic diagram of the structure of the positioning mechanism in the present application.

[0026] ​​​Figure 11 Structure diagram of the chute in the application.

[0027] In the figure: 1, base; 2, servo motor; 3, mounting plate; 4, lead screw; 5, nut seat; 6, guide rail; 7, moving block; 8, bracket; 9, object table; 10, hydraulic rod; 11, driving block; 12, driven block; 13, fixed plate; 14, first nut; 15, second nut; 16, ring groove; 17, mounting groove; 18, adjusting ring; 19, adjusting gear ring; 20, incomplete gear; 21, driving motor; 22, U-shaped plate; 23, connecting plate; 24, guide groove; 25, positioning groove; 26, limiting groove; 27, driven rod; 28, clamping block; 29, vertical groove; 30, fixed block; 31, chute. DETAILED DESCRIPTION

[0028] Please refer to Figures 1-3 In the embodiment of the application, a large-load roller screw includes a base 1 and symmetrical mounting plates 3. The symmetrical mounting plates 3 are commonly connected with a lead screw 4 at the middle part. The outer wall of the lead screw 4 is connected with a first nut 14 and a second nut 15. The first nut 14 and the second nut 15 are both provided with balls and internal circulation channels inside, which are common technical means in the prior art. The outer wall of the first nut 14 and the second nut 15 is commonly provided with a nut seat 5. The inner cavity of the nut seat 5 is provided with a ring groove 16. The inner cavity of the ring groove 16 is provided with an adjusting mechanism for driving the second nut 15 to move horizontally. When the adjusting mechanism rotates, the second nut 15 intermittently moves away from or approaches the position of the first nut 14. The cylindrical body with a helical raceway in the ball screw is the driving part of the transmission. The inside of the nut is machined with a helical raceway matched with the lead screw, which is sleeved on the lead screw and rotates with the lead screw to realize linear motion. The balls are between the raceways of the lead screw and the nut, which are usually steel balls. The rolling friction is used to replace the sliding friction to reduce the transmission resistance. The internal circulation device guides the balls to circulate through the reversers (such as crescent-shaped or circular) inside the nut, which has compact structure and stable operation.

[0029] Please refer to Figure 1 , Figure 2 and Figure 11The lower end of the symmetrical mounting plate 3 is fixedly connected to the middle of the upper end of the base 1, the middle of one side of the upper end of the base 1 is drivingly connected with a servo motor 2, the output end of the servo motor 2 is drivingly connected with a lead screw 4 through a shaft coupling (which is a key component for connecting two shafts or a shaft and a rotating part in mechanical transmission, used for transmitting torque, compensating deviation and damping, which is a commonly used technical means in the prior art), the lead screw 4 can be driven to rotate by the servo motor 2, and then the nut block 5 is driven to reciprocate in the horizontal direction through the driving cooperation of the first nut 14, the second nut 15 and the lead screw 4, the upper end of the base 1 is fixedly connected with symmetrical guide rails 6, the outer wall of the guide rail 6 is slidingly connected with a moving block 7, the upper end of the moving block 7 is provided with symmetrical sliding grooves 31, the upper end of the moving block 7 is slidingly connected with a bracket 8, the lower end of the bracket 8 is slidingly connected in the inner cavity of the sliding groove 31, the upper end of the moving block 7 is drivingly connected with a hydraulic rod 10, the output end of the hydraulic rod 10 is fixedly connected with the bracket 8, the bracket 8 can be driven to move in the vertical direction by the hydraulic rod 10, so that the bracket 8 moves vertically in the inner cavity of the sliding groove 31.

[0030] Please refer to Figures 2-4 The upper end of the symmetrical bracket 8 is fixedly connected with a loading table 9, the middle of the lower end of the loading table 9 is fixedly connected with symmetrical driven blocks 12, the middle of the upper end of the nut block 5 is fixedly connected with a driving block 11, the width of the driving block 11 is equal to the interval between the symmetrical driven blocks 12, so that when the lead screw 4 is driven to rotate by the servo motor 2, the nut block 5 and the driving block 11 are driven to move synchronously in the horizontal direction, the driving block 11 contacts the side wall of the driven block 12, so as to drive the driven block 12 to move, and then the loading table 9, the bracket 8 and the moving block 7 move synchronously in the horizontal direction, the plane where the top of the driving block 11 is located is lower than the plane where the lower end surface of the loading table 9 is located, and the plane where the lower end surface of the driven block 12 is located is higher than the plane where the upper end of the nut block 5 is located, so that when the loading table 9 carries goods, the bottom of the bracket 8 is located at the position of the inner cavity bottom of the sliding groove 31, and the driven block 12 does not contact the top of the nut block 5, so as to avoid that the lead screw 4 and the nut block 5 directly bear the weight of the goods, through the arrangement of the bracket 8 and the loading table 9, the weight of the goods can be shared to the moving block 7, so that the ball screw only needs to overcome the increased frictional resistance when the moving block 7 moves horizontally with the increase of the weight of the goods carried by the loading table 9, and then the maximum weight that can be borne by the ball screw is improved, and the load capacity of the ball screw is improved.

[0031] Please refer to Figures 5-7, the adjusting mechanism comprises an adjusting ring 18, the second nut 15 is provided with external threads at one end away from the first nut 14, the inner cavity of the adjusting ring 18 is provided with internal threads, the second nut 15 and the adjusting ring 18 are in transmission cooperation through the external threads and the internal threads, the first nut 14 is fixedly connected with a fixed plate 13 at one side away from the second nut 15, the fixed plate 13 is fixedly connected with the nut seat 5 through bolts, the outer wall of the adjusting ring 18 is fixedly connected with an adjusting gear ring 19 at the middle part, the upper end of the annular groove 16 is provided with a mounting groove 17, the inner cavity of the mounting groove 17 is transmissionally connected with a driving motor 21 at one side close to the first nut 14, the output end of the driving motor 21 is fixedly connected with an incomplete gear 20, the incomplete gear 20 is in mesh with the adjusting gear ring 19, when the driving motor 21 drives the incomplete gear 20 to rotate clockwise, the incomplete gear 20 will be in intermittent contact with the adjusting gear ring 19, so as to drive the adjusting gear ring 19 to rotate counterclockwise intermittently, and then drive the adjusting ring 18 to rotate counterclockwise, then under the transmission effect of the threaded connection, the second nut 15 can be driven to move away from the position of the first nut 14 intermittently, in the same way, when the incomplete gear 20 rotates counterclockwise, the second nut 15 can be driven to move close to the position of the first nut 14, through the rotation of the incomplete gear 20 driven by the driving motor 21, the second nut 15 can be driven to move close to or away from the position of the first nut 14 intermittently, so that the first nut 14 and the second nut 15 are relatively moved, so as to exert a pre-tightening force on the first nut 14 and the second nut 15, to eliminate the idle stroke when the ball screw reverses, and the double-nut of the first nut 14 and the second nut 15 in the pre-tightening state can keep the ball and the raceway in close contact at all times, reduce the elastic deformation when stressed, improve the overall transmission rigidity, and through the double-nut setting of the first nut 14 and the second nut 15, compared with a single nut, the two nuts can share the load transmitted by the screw, reduce the stress intensity of the single nut, and prolong the service life.

[0032] Please refer to Figure 7 Through the intermittent transmission of the incomplete gear 20 and the adjusting gear ring 19, the relative movement of the second nut 15 and the first nut 14 can be conveniently adjusted, so that the pre-tightening force between the first nut 14 and the second nut 15 can be conveniently and accurately adjusted, the pre-tightening force can be accurately adjusted according to the different weights of the goods, the load capacity of the ball screw is improved, the pre-tightening force is prevented from being too large to cause excessive wear of the ball, and the service life of the ball screw is greatly reduced. After the pre-tightening force is adjusted, the position of the second nut 15 needs to be fixed. Since the incomplete gear 20 and the adjusting gear ring 19 cannot continuously maintain the meshing state, after the driving motor 21 is self-locked to limit the position of the incomplete gear 20, if the incomplete gear 20 is not in mesh with the adjusting gear ring 19, the limiting effect of the adjusting gear ring 19 cannot be achieved, and the adjusting ring 18 and the second nut 15 cannot be limited and fixed.

[0033] Please refer to Figures 7-8 , both sides of the ring-shaped groove 16 are provided with positioning mechanisms for clamping and limiting the adjusting tooth ring 19, the positioning mechanisms include vertical grooves 29, the vertical grooves 29 are opened in the inner cavity of the nut seat 5 away from the first nut 14, the distance between the symmetrical vertical grooves 29 is greater than the width of the ring-shaped groove 16, a recess is opened in the middle of the inner cavity of the ring-shaped groove 16 close to one side of the vertical groove 29, a clamping block 28 is horizontally and slidingly connected in the inner cavity of the recess, the end of the clamping block 28 is clamped and matched with the adjusting tooth ring 19, so as to limit and fix the adjusting tooth ring 19, and then limit and fix the adjusting ring 18, and the adjusting ring 18 is matched with the second nut 15 through threaded transmission, so when the adjusting ring 18 is limited and fixed, the second nut 15 will also be limited, so that the interval between the first nut 14 and the second nut 15 is fixed, ensuring that the adjusted pre-tightening force can be kept stable, so that the ball screw can be stably kept at the improved load capacity.

[0034] Please refer to Figures 9-10 , the inner cavity of the vertical groove 29 is vertically and slidingly connected with a U-shaped plate 22, the height of the U-shaped plate 22 is greater than the height of the inner cavity of the vertical groove 29, the top of the nut seat 5 is provided with a U-shaped groove slidingly matched with the U-shaped plate 22, the U-shaped groove is communicated with the inner cavity of the vertical groove 29, the inner cavity of the U-shaped plate 22 is fixedly connected with a fixed block 30 at the upper part, the upper end of the fixed block 30 and the top of the inner cavity of the vertical groove 29 are elastically connected by a spring, that is, when the U-shaped plate 22 is not subjected to downward pressure, the spring will shrink to vertically move the U-shaped plate 22 upward, the side of the upper end of the U-shaped plate 22 close to the driving block 11 is fixedly connected with a connecting plate 23, the end of the connecting plate 23 away from the U-shaped plate 22 is attached to the side wall of the driving block 11, when the lower end of the support 8 is located in the inner cavity of the sliding groove 31, the distance between the lower end surface of the driven block 12 and the nut seat 5 is the same as the vertical height of the connecting plate 23, so when the support 8, the object table 9 and the driven block 12 are vertically moved upward driven by the hydraulic rod 10, the position of the driven block 12 away from the nut seat 5, the connecting plate 23 loses the extrusion of the driven block 12, so the U-shaped plate 22 will drive the connecting plate 23 to move upward synchronously under the action of the elastic force, and the driven block 12 moves downward will extrude the connecting plate 23 downward, and then push the U-shaped plate 22 to vertically move downward in the inner cavity of the vertical groove 29, so that the spring is stretched.

[0035] Please refer to Figure 10The middle of the side of the clamping block 28 away from the adjusting tooth ring 19 is fixedly connected with symmetrical driven rods 27. The width of the clamping block 28 is the same as the width of the inner cavity of the U-shaped plate 22, so that the outer wall of the side of the clamping block 28 away from the adjusting tooth ring 19 is attached to the inner cavity side wall of the U-shaped plate 22. The length of the inner cavity of the U-shaped plate 22 is greater than the length of the clamping block 28. The inner cavity side wall of the U-shaped plate 22 is provided with symmetrical limiting grooves 26. The outer wall of the side of the driven rod 27 away from the clamping block 28 is in sliding fit with the limiting groove 26. The lower end of the limiting groove 26 is provided with a guide groove 24. The horizontal distance between the two ends of the guide groove 24 is greater than the length of the clamping block 28 inserted into the inner cavity of the ring-shaped groove 16 through the groove. The lower end of the guide groove 24 is provided with a positioning groove 25. When the driven rod 27 is located in the inner cavity top of the limiting groove 26, the clamping block 28 is in clamping fit with the adjusting tooth ring 19. When the U-shaped plate 22 moves upward, the driven rod 27 will gradually approach the guide groove 24. When the driven rod 27 is relatively located in the inner cavity of the guide groove 24, the clamping block 28 will be continuously driven away from the position of the adjusting tooth ring 19 under the sliding fit of the guide groove 24 and the driven rod 27. When the driven rod 27 is located in the inner cavity bottom of the positioning groove 25, the end of the clamping block 28 close to the adjusting tooth ring 19 moves to the inner cavity of the groove, so as to release the limiting and fixing of the clamping block 28 to the adjusting tooth ring 19.

[0036] Please refer to Figures 7-10, the center position of the clamping block 28 can always correspond to the position between the two adjacent teeth in the middle of the outer wall of the adjusting tooth ring 19 during the rotation of the incomplete gear 20 driving the adjusting tooth ring 19, so that after the adjustment of the position of the second nut 15 is completed, the clamping block 28 can accurately limit and fix the adjusting tooth ring 19, that is, after the adjustment is completed, the downward movement of the driven block 12 will drive the U-shaped plate 22 to move downward through the connecting plate 23, at this time the driven rod 27 will be relatively moved from the bottom of the inner cavity of the positioning groove 25 to the top of the inner cavity of the limiting groove 26, so as to drive the clamping block 28 to approach and contact the adjusting tooth ring 19, and complete the limiting and fixing of the adjusting tooth ring 19. The vertical height of the limiting groove 26 is the same as that of the positioning groove 25, and the vertical height of the positioning groove 25 is greater than that of the driven rod 27, so that during the horizontal reciprocating movement of the nut seat 5 and the object table 9 driven by the screw rod 4 and the first nut 14 and the second nut 15, the height of the limiting support 8 through the hydraulic rod 10 is always located at the bottom of the inner cavity of the sliding groove 31, so that the driven block 12 can continuously press the connecting plate 23, so that the lower end surface of the connecting plate 23 is always in contact with the upper end surface of the nut seat 5, so that the driven rod 27 is always located at the top of the inner cavity of the limiting groove 26, so as to ensure that the position of the clamping block 28 in the horizontal direction is limited by the cooperation of the driven rod 27 and the limiting groove 26, so that the clamping block 28 always clamps and limits the adjusting tooth ring 19, and will not shake in the horizontal direction due to vibration during movement, so as to change the pre-tightening force and change the load capacity of the ball screw, so as to cause the pre-tightening force to be too small to load or the pre-tightening force to be too large to cause serious ball wear.

[0037] The hydraulic rod 10 drives the support 8, the object table 9 and the driven block 12 to move in the vertical direction, so that when the weight of the goods to be transported becomes larger, the pre-tightening force between the first nut 14 and the second nut 15 is usually adjusted when there is no load. At this time, it is difficult to determine whether the pre-tightening force can be adjusted at one time. Through the cooperation of the hydraulic rod 10 and the object table 9, the support 8, the object table 9 and the goods can be lifted synchronously after the goods are loaded, and if the previous pre-tightening force is not enough, the driven block 12 can be lifted after the object table 9 and the goods are lifted, and the incomplete gear 20 is driven to rotate again by the driving motor 21, so as to accurately adjust the pre-tightening force between the first nut 14 and the second nut 15, so as to ensure that the load capacity of the ball screw is improved, the ball is not excessively worn, the ball screw has a long service life, and the load capacity and service life of the ball screw are not affected by the change of the pre-tightening force due to vibration during long-term use.

Claims

1. A large load roller screw comprising a base and symmetrical mounting plates, characterized in that, The middle part of the symmetrical mounting plate is connected with a lead screw, the outer wall of the lead screw is connected with a first nut and a second nut, the outer wall of the first nut and the second nut is provided with a nut seat, the inner cavity of the nut seat is provided with a ring groove, the inner cavity of the ring groove is provided with an adjusting mechanism for driving the second nut to move horizontally, when the adjusting mechanism rotates, the second nut intermittently moves away from or approaches the position of the first nut.

2. A large load roller screw as set forth in claim 1, wherein, The lower end of the symmetrical mounting plate is fixedly connected to the upper end of the middle part of the base, the upper end of the base is connected with a servo motor, the output end of the servo motor is connected with the lead screw, and the upper end of the base is fixedly connected with symmetrical guide rails.

3. A large load roller screw as set forth in claim 2 wherein, The outer wall of the guide rail is connected with a moving block, the upper end of the moving block is provided with symmetrical sliding grooves, the upper end of the moving block is connected with a bracket, the lower end of the outer wall of the bracket is connected in the inner cavity of the sliding groove, the upper end of the moving block is connected with a hydraulic rod, and the output end of the hydraulic rod is fixedly connected with the bracket.

4. A large load roller screw as set forth in claim 3 wherein, The upper end of the symmetrical bracket is fixedly connected with a carrier, the lower end of the carrier is fixedly connected with symmetrical driven blocks, the upper end of the nut seat is fixedly connected with a driving block, the top of the driving block is lower than the plane of the lower end of the carrier, and the plane of the lower end of the driven block is higher than the plane of the upper end of the nut seat.

5. A large load roller screw as set forth in claim 1, wherein, The adjusting mechanism comprises an adjusting ring, the adjusting ring is threadedly connected with the second nut, the side of the first nut away from the second nut is fixedly connected with a fixed plate, the fixed plate is fixedly connected with the nut seat through bolts, and the outer wall of the adjusting ring is fixedly connected with an adjusting gear ring.

6. A large load roller screw as set forth in claim 5 wherein, The upper end of the ring groove is provided with a mounting groove, the inner cavity of the mounting groove is connected with a driving motor, the output end of the driving motor is fixedly connected with an incomplete gear, and the incomplete gear is engaged with the adjusting gear ring.

7. A large load roller screw as set forth in claim 6 wherein, Both sides of the ring groove are provided with positioning mechanisms, the positioning mechanisms comprise vertical grooves, the vertical grooves are arranged on the inner cavity of the nut seat away from the first nut, the distance between the symmetrical vertical grooves is greater than the width of the ring groove, the inner cavity of the ring groove is provided with a groove near the vertical groove, the inner cavity of the groove is horizontally connected with a clamping block, and the end of the clamping block is connected with the adjusting gear ring.

8. A large load roller screw as claimed in claim 7, wherein, The inner cavity of the vertical groove is vertically connected with a U-shaped plate, the upper end of the U-shaped plate is fixedly connected with a connecting plate near the second nut, the height of the U-shaped plate is greater than the height of the inner cavity of the vertical groove, the top of the nut seat is provided with a U-shaped groove for sliding cooperation with the U-shaped plate, the inner cavity of the U-shaped plate is fixedly connected with a fixed block, and the upper end of the fixed block is elastically connected with the top of the inner cavity of the vertical groove through a spring.

9. A large load roller screw as set forth in claim 8 wherein, The symmetric driven rods are fixedly connected to the middle part of the side of the card block away from the adjusting tooth ring, the width of the card block is the same as the width of the inner cavity of the U-shaped plate, symmetric limiting grooves are arranged on the side wall of the inner cavity of the U-shaped plate, a guide groove is arranged at the lower end of the limiting groove, and a positioning groove is arranged at the lower end of the guide groove, and the outer wall of the side of the driven rod away from the card block is in sliding fit with the limiting groove, the guide groove and the positioning groove.

10. A large load roller screw as set forth in claim 9 wherein, The horizontal distance between the two ends of the guide groove is greater than the length of the card block penetrating through the groove and extending into the inner cavity of the ring-shaped groove, the vertical height of the limiting groove is the same as the vertical height of the positioning groove, and the vertical height of the positioning groove is greater than the vertical height of the driven rod.

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