Roller screw nut strip pair transmission device

Abstract

The utility model discloses a roller screw-nut strip pair transmission device which comprises a fixed seat, a roller screw is rotatably connected to the fixed seat, one end of the roller screw is in transmission connection with a power assembly which controls the roller screw to rotate, the power assembly is arranged on the fixed seat, and the roller screw nut strip pair transmission device further comprises a nut strip matched with the roller screw. The nut strip extends along the axial direction of the roller screw rod, the nut strip is provided with a roller path in which screw teeth on the roller screw rod slide, and when the roller screw rod rotates, the nut strip axially moves relative to the roller screw rod; a roller with the outer wall face attached to the inner wall face of the roller path is rotationally connected to threads of the roller screw, and the roller rolls relative to the roller path. The transmission device is an ideal transmission device for large, heavy and high-precision equipment, has a wide use space and good economic benefits, and is complete in overall function and high in practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical transmission, and more specifically, to a roller screw nut strip pair transmission device. Background Art

[0002] There are two commonly used linear transmission methods in the world: mechanical transmission or linear motor direct transmission. Mechanical transmission includes screw nut transmission, ball screw transmission, gear rack transmission, worm gear transmission, screw nut transmission. These transmission methods have their own advantages and disadvantages as follows:

[0003] Screw nuts and screw nut strips are mainly used in large transmission equipment. They have the advantages of large torque transmission and easy installation. The disadvantages are large friction coefficient, slow rotation speed, and slow movement speed. There is reverse clearance, it cannot be accurately positioned, and it will move during processing, so a locking mechanism is required. Now that global equipment has entered the era of digital control, this transmission method has been gradually eliminated.

[0004] Ball screws and gear racks are the main mechanical transmission methods for current digital equipment. Ball screws can achieve zero gap after being pre-loaded with steel balls. Because of rolling friction, they have the advantages of low friction coefficient, fast transmission speed, high precision, and high efficiency. They are adopted by most equipment. However, since the ball screw is a cylindrical ball circulation structure, the two ends of the screw are fixed and the nut moves in the middle. When the transmission distance is too long, the screw will bend due to its own weight, resulting in poor accuracy. Various screw supports have also appeared on the market, or the screw is fixed and the nut is rotated to reduce the distortion of the screw. However, when the aspect ratio of the transmission exceeds 10 times, the effect of these support methods is still not ideal, because the screw with a larger aspect ratio is greatly affected by temperature changes. Also, when the moving distance is more than 12 meters, it is difficult for the ball screw to ensure the moving positioning accuracy. At this time, most equipment uses gear racks as the transmission method. Because most racks are one for every 1 meter, they can be infinitely long in theory. However, the gear racks are intermittent line transmissions, and the circumferential length is converted into a straight line length, which has a large inherent error. In addition, since the gear transmission must have a tooth gap, the transmission error is increased. Therefore, a complex clearance elimination structure is required for gear rack transmission, which makes installation difficult. When the gear rack is driven, because the gear rotates in a circle, at most 3 tooth profiles can be stressed at the same time, and the stress is uneven and small. The gear rotates one circle, the moving distance is too large, and a large-scale reduction mechanism needs to be installed. Therefore, the installation method of the gear rack is limited, and the installation cost is too high. It is only used when the ball screw cannot meet the requirements. Based on this, the utility model proposes a roller screw nut bar pair transmission device. Utility Model Content

[0005] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a roller screw nut strip pair transmission device.

[0006] In order to solve the above technical problems, the purpose of the utility model is achieved as follows: the utility model involves a roller screw nut strip pair transmission device, including a fixed seat, a roller screw is rotatably connected to the fixed seat, one end of the roller screw is transmission-connected to a power assembly for controlling its rotation, the power assembly is arranged on the fixed seat, and also includes a nut strip matching the roller screw, the nut strip extends along the axial direction of the roller screw, the nut strip is provided with a raceway for the screw teeth on the roller screw to slide inside, when the roller screw rotates, the nut strip moves axially relative to the roller screw;

[0007] The threaded teeth of the roller screw are rotatably connected with a roller whose outer wall surface is attached to the inner wall surface of the raceway, and the roller rolls relative to the raceway.

[0008] The utility model is further configured as follows: the thread section of the roller screw matches the section of the raceway; the thread section of the roller screw is in an isosceles trapezoidal shape, and the roller is in a truncated cone shape.

[0009] The utility model is further configured as follows: the number of the roller screw is not less than one; two adjacent roller screws are connected via a coupling to form a multi-roller screw transmission structure.

[0010] The utility model is further configured as follows: the nut strip is formed by connecting end to end a single-segment nut strip or at least two segments of nut strip bodies with standard pitches whose pitches are integers according to the moving distance.

[0011] The utility model is further configured as follows: the power assembly includes a motor, a reducer, a driven pulley, a driving pulley and a belt, the reducer is connected in series with the motor and the driving pulley, the driven pulley is transmission-connected to the roller screw, and the belt connects the driving pulley and the driven pulley.

[0012] In summary, the utility model has the following beneficial effects: the roller screw nut strip transmission device involved in the utility model effectively solves the above problems. The roller screw uses a screw with a larger pitch, and the thread surface is inlaid with a clamp roller. The roller is consistent with the thread shape, and the roller rotation surface size is larger than the thread size. When the screw rotates with the nut strip, the roller on the screw first contacts the raceway surface of the nut strip. When the screw rotates, the roller on the screw rotates under force, so that the sliding friction when the screw nut rotates becomes rolling friction. The friction coefficient is effectively reduced. By adjusting the center distance between the screw and the nut, the desired pre-pressure can be obtained, so that the screw nut can move without gap. Because a semicircular nut strip is used, the nut strip can be extended infinitely, and the pitch is an integer standard pitch. In the manufacturing process of the nut strip, very high precision can be guaranteed, and the accuracy of movement is guaranteed from the surface. Multiple rollers can be kept in contact at the same time in each pitch of the nut, which can withstand a very high driving torque, and multiple screws can be used in series to achieve ultra-high load. Because the screw nut strip realizes rolling friction and preload characteristics, it has all the advantages of ball screws. The nut strip can be fixed on the mounting surface in a single-stage series. Theoretically, it can be strung into an infinite length, which has the advantages of gear racks. Combining its characteristics, the roller screw nut pair transmission device is an ideal transmission device for large, heavy, and high-precision equipment, with a wide range of applications and good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 It is a partial structural schematic diagram of the utility model;

[0015] Figure 3 It is a partial structural schematic diagram of the utility model;

[0016] Figure 4 yes Figure 3 A schematic diagram of the structure from another perspective;

[0017] Figure 5 It is a structural schematic diagram of the utility model for reflecting the nut strip. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solution of the utility model, the preferred implementation scheme of the utility model is described below in conjunction with specific embodiments, but it should be understood that these descriptions are only for further illustrating the features and advantages of the utility model, rather than limiting the patent requirements of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the utility model.

[0019] The utility model is further described below in conjunction with the accompanying drawings and preferred embodiments.

[0020] Example 1

[0021] See also Figures 1 to 5 As shown, a roller screw nut strip pair transmission device involved in this embodiment includes a fixed seat 1, a roller screw 2 is rotatably connected to the fixed seat 1, one end of the roller screw 2 is transmission-connected to a power assembly 3 for controlling its rotation, the power assembly 3 is arranged on the fixed seat 1, and also includes a nut strip 4 matching the roller screw 2, the nut strip 4 extends along the axial direction of the roller screw 2, and a raceway 5 is provided on the nut strip 4 for the screw teeth on the roller screw 2 to slide inside, and when the roller screw 2 rotates, the nut strip 4 moves axially relative to the roller screw 2;

[0022] The thread of the roller screw 2 is rotatably connected to a roller 6 whose outer wall surface is attached to the inner wall surface of the raceway, and the roller 6 rolls relative to the raceway 5.

[0023] Furthermore, the thread section of the roller screw 2 matches the section of the raceway 5; the thread section of the roller screw 2 is an isosceles trapezoid, and the roller 6 is truncated.

[0024] Furthermore, the power assembly 3 includes a motor 31, a reducer 32, a driven pulley 33, a driving pulley and a belt 34, the reducer is connected in series with the motor and the driving pulley, the driven pulley is transmission-connected to the roller screw, and the belt connects the driving pulley and the driven pulley.

[0025] In this embodiment, the roller screw 2 is rotated on the fixed seat 1 through the operation of the power assembly 3 and the transmission of the mechanism, and then the nut strip 4 is axially moved relative to the roller screw 2 through the transmission between the screw thread and the raceway 5. In addition, because the outer wall surface of the roller 6 connected to the screw thread is attached to the inner wall surface of the raceway, the original sliding friction is converted into rolling friction, which effectively reduces the friction coefficient.

[0026] The belt pair used in the powertrain 3 may also be replaced by a gear pair that achieves the same function, or an existing mechanical transmission structure that achieves the same function.

[0027] Example 2

[0028] See also Figures 1 to 5 As shown, the present embodiment involves a panel for a ceiling cross-flow heater, which is further configured on the basis of Embodiment 1, wherein the number of the roller screw 2 is not less than one; two adjacent roller screws 2 are connected by a coupling 7 to form a multi-roller screw transmission structure.

[0029] In this embodiment, by connecting multiple units of roller screws 2 in series, the effect of connecting multiple screw sections in series is achieved, thereby realizing an ultra-high load-bearing function.

[0030] Example 3

[0031] See also Figures 1 to 5 As shown, the present embodiment involves a panel for a ceiling cross-flow heater, which is further configured on the basis of embodiments 1 and 2, wherein the nut strip 4 is formed by connecting end to end a single-segment nut strip or at least two segments of a nut strip main body 41 with a standard pitch whose pitch is an integer according to the moving distance.

[0032] In this embodiment, because the pitch of the nut strip body 41 is a standard pitch of an integer, very high precision can be guaranteed during the nut strip manufacturing process, thereby ensuring the accuracy of movement. Multiple rollers can be kept in contact at the same time within each pitch of the nut, and can withstand very high driving torque.

[0033] In addition, the nut strips can be fixed in series on the mounting surface in a single section. Theoretically, they can be strung into an infinite length, which has the advantages of gear racks.

[0034] The roller screw nut strip pair transmission device involved in the utility model uses a screw with a larger pitch through the roller screw, and the thread surface is inlaid with a clamp roller. The roller is consistent with the thread shape, and the roller rotation surface size is larger than the thread size. When the screw rotates with the nut strip, the roller on the screw first contacts the raceway surface of the nut strip. When the screw rotates, the roller on the screw is forced to rotate, so that the sliding friction when the screw and nut rotate is converted into rolling friction. The friction coefficient is effectively reduced. By adjusting the center distance between the screw and the nut, the desired pre-pressure can be obtained, so that the screw and nut can move without gap. Because a semicircular nut strip is used, the nut strip can be infinitely extended, and the pitch is an integer standard pitch. Very high precision can be guaranteed during the manufacturing process of the nut strip, and the accuracy of movement is guaranteed from the surface. Multiple rollers can be kept in contact at the same time within each pitch of the nut, and it can withstand a very high driving torque. Multiple screws can be connected in series to achieve ultra-high load. Because the screw nut strip realizes rolling friction and preload characteristics, it has all the advantages of ball screws. The nut strip can be fixed on the mounting surface in a single-stage series. Theoretically, it can be strung into an infinite length, which has the advantages of gear racks. Combining its characteristics, the roller screw nut pair transmission device is an ideal transmission device for large, heavy, and high-precision equipment. It has a wide range of use space, good economic benefits, complete overall functions, and strong practicality.

[0035] Unless otherwise specified, in the present invention, the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicating orientation or positional relationship are based on the orientation or positional relationship actually shown, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the orientation or positional relationship in the present invention are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood in combination with the embodiments and according to specific circumstances.

[0036] Unless otherwise clearly specified and limited, in the present invention, the terms "disposed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A roller screw nut strip pair transmission device, including a fixed seat, characterized in that: The fixing seat is rotatably connected with a roller screw, one end of which is drivingly connected with a power assembly for controlling the roller screw to rotate, the power assembly is arranged on the fixing seat, and further comprises a nut bar matching the roller screw, the nut bar extends along the axial direction of the roller screw, the nut bar is provided with a raceway for the screw teeth on the roller screw to slide inside, and when the roller screw rotates, the nut bar moves axially relative to the roller screw; The threaded teeth of the roller screw are rotatably connected with a roller whose outer wall surface is attached to the inner wall surface of the raceway, and the roller rolls relative to the raceway.

2. The roller screw nut strip pair transmission device according to claim 1, characterized in that: The thread section of the roller screw matches the section of the raceway; the thread section of the roller screw is an isosceles trapezoid, and the roller is truncated.

3. The roller screw nut strip pair transmission device according to claim 1 or 2, characterized in that: The number of the roller screws is not less than one; two adjacent roller screws are connected via a coupling to form a multi-roller screw transmission structure.

4. The roller screw nut strip pair transmission device according to claim 1, characterized in that: The nut strip is formed by connecting a single-segment nut strip or at least two segments of nut strip bodies with standard pitches whose pitches are integers, end to end, according to the moving distance.

5. The roller screw nut strip pair transmission device according to claim 1, characterized in that: The power assembly includes a motor, a reducer, a driven pulley, a driving pulley and a belt. The reducer is connected in series with the motor and the driving pulley, the driven pulley is transmission-connected to the roller screw, and the belt connects the driving pulley and the driven pulley.

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