Lead screw transmission device with floating supporting structure
By introducing a floating support structure into the ball screw drive, the problems of screw sag and bending are solved, achieving high precision and stable transmission.
Patent Information
- Application Number
- CN202511306629.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-12
- Publication Date
- 2025-10-31
AI Technical Summary
Existing ball screws are prone to bending or sagging when they are long, which leads to vibration, transmission errors and stress concentration, making it difficult to meet the requirements of high-precision transmission.
A floating support structure is adopted, including a second guide rail parallel to the transmission lead screw and a slidingly connected floating support assembly. The arc-shaped support part fits with the lead screw to provide support force, avoids rigid constraints, and reduces sagging and bending.
It improves transmission accuracy and stability, reduces the risk of vibration and resonance, and enhances the stability and reliability of the device.
Smart Images
Figure CN120868178A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of lead screw transmission technology, and more specifically, to a lead screw transmission device with a floating support structure. Background Technology
[0002] In modern machine tools, gantry machining centers, and other high-precision equipment, ball screws are widely used in transmission and feed systems, becoming crucial components due to their efficient and precise transmission performance. Ball screws not only need to bear large loads but also require high transmission accuracy and stability. Therefore, in these demanding devices, the performance of the ball screw directly affects machining accuracy and equipment operational stability. As machine tool strokes increase, the length of the ball screw gradually increases. Under the influence of gravity, the ball screw inevitably experiences mid-section sag, which can cause vibration and resonance, and may even lead to transmission errors or jamming. Therefore, how to effectively support the ball screw, especially avoiding the negative effects of mid-section sag, has always been a pressing technical problem to be solved in CNC equipment design.
[0003] In existing technologies, ball screw support methods are mainly concentrated at both ends of the screw, using a fixed support structure at both ends. However, when the screw length is long, the lack of support in the middle makes the screw prone to bending or sagging, leading to severe vibration, transmission errors, and stress concentration during operation. This exacerbates the wear and deformation of the screw. For some structures that use thickened screws, although the sagging of the screw can be reduced, thickening the screw often leads to an increase in its own weight, making it unsuitable for high-precision transmission applications.
[0004] Therefore, there is a need to provide a lead screw drive device with a floating support structure to solve the problem that existing lead screws are prone to bending or sagging when they are long. Summary of the Invention
[0005] The main objective of this invention is to provide a screw drive device with a floating support structure, which aims to solve the technical problems mentioned in the background section.
[0006] The present invention adopts the following technical solution: A screw drive device with a floating support structure includes a base and two first guide rails. The two first guide rails are arranged on the upper surface of the base along the length direction of the base. A drive screw parallel to the first guide rails is rotatably connected to the opposite ends of the base. The drive screw is threadedly connected to a sliding platform, and the sliding platform is slidably connected to the first guide rails. A floating support mechanism is provided below the transmission lead screw. The floating support mechanism includes a second guide rail parallel to the transmission lead screw. A floating support assembly is slidably connected to the second guide rail. The floating support assembly is provided with a support block. The support block forms an arc-shaped support portion. The arc-shaped support portion slides against the transmission lead screw, and the radius of the arc-shaped support portion is equal to the radius of the transmission lead screw.
[0007] Furthermore, the floating support assembly also includes a support base, which is slidably connected to the second guide rail via a support slider. A floating block is connected to the upper end face of the support base, and the support block and the floating block are detachably connected. The floating block has buffer cavities at its two opposite ends. Guide posts are inserted into the buffer cavities, and elastic elements are arranged around the guide posts. The two opposite ends of the elastic elements abut against the inner top wall of the buffer cavity and the upper end face of the support seat, respectively, so that the floating block drives the arc-shaped support part to fit against the transmission screw.
[0008] Furthermore, the floating support assembly includes two sets, with guide rods fixedly connected to the opposite sides of the two support seats. The guide rods are arranged parallel to the transmission screw, and the two guide rods are respectively arranged on opposite sides of the second guide rail.
[0009] Furthermore, the transmission screw is threadedly connected to a ball nut, and the bottom end of the sliding platform extends to two symmetrically arranged connecting guard plates. The two connecting guard plates are respectively connected to opposite sides of the ball nut. A disc-shaped mounting plate is provided on one side of the ball nut, and a rectangular connecting plate is connected to the side of the two connecting guard plates facing the mounting plate. The connecting plate is fixedly connected to the mounting plate so that the sliding platform is threadedly connected to the transmission screw through the ball nut.
[0010] Furthermore, the base has an M-shaped cross-section, and the upper end face of the base is provided with a mounting groove extending along the length direction. The inner bottom wall of the mounting groove has a mounting protrusion facing the transmission screw. The mounting protrusion is provided with a mounting position. One side of the mounting position is provided with an inclined surface. The second guide rail is disposed in the mounting position. A fixing block is installed in the inclined surface. The opposite sides of the fixing block abut against the second guide rail and the inclined surface of the inclined surface, respectively.
[0011] Furthermore, a support grid is provided at the bottom end of the base, and a V-shaped first support rib extends from the bottom end of the mounting groove. The end of the first support rib away from the mounting groove intersects and is fixed with the support grid.
[0012] Furthermore, V-shaped collection grooves extend from opposite sides of the base, the bottom of the collection grooves being lower than the inner bottom wall of the mounting groove, and the bottom of the collection grooves being connected to an array of second support ribs, the bottom ends of the second support ribs intersecting and fixed to the support grid.
[0013] Furthermore, a transmission bracket is fixedly connected to one side of the base, the transmission bracket extends obliquely upward toward the side away from the base, and a motor is fixedly connected to the side of the transmission bracket away from the base. The output shaft of the motor passes through the transmission bracket, and the output shaft of the motor is fixedly connected to the transmission lead screw through a coupling.
[0014] Furthermore, a fixed seat is provided on each of the opposite sides of the mounting groove, and a bearing is connected between the two fixed seats. The bearing is sleeved on the outside of the transmission screw, and an arch-shaped pressure block is provided above the bearing. The opposite sides of the pressure block are respectively fixedly connected to the fixed seat.
[0015] Beneficial effects: In a lead screw transmission device with a floating support structure according to the present invention, an effective support method is provided by setting a floating support structure below the transmission lead screw. The floating support structure includes a second guide rail parallel to the transmission lead screw and a floating support assembly slidably connected to the guide rail. The support assembly has an arc-shaped support portion that can fit in close contact with the transmission lead screw and provide appropriate support force. The radius of the arc-shaped support portion matches the radius of the transmission lead screw, which can avoid the rigid constraint of the support portion on the lead screw, ensure the degree of freedom of the lead screw during operation, and effectively counteract the problem of sagging in the middle caused by gravity, reducing the possibility of bending deformation. It provides continuous and stable support in the middle of the lead screw, preventing sagging caused by its own weight during long-distance transmission, and reducing the risk of vibration, resonance, and transmission errors. This not only improves the transmission accuracy of the transmission device, but also avoids stress concentration problems, thereby improving the stability and long-term reliability of the entire device. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of a screw drive device with a floating support structure according to the present invention; Figure 2 yes Figure 1 Enlarged structural diagram at point A; Figure 3 This is a cross-sectional structural schematic diagram of a screw drive device with a floating support structure according to the present invention; Figure 4 yes Figure 3 Enlarged structural diagram at point B; Figure 5 This is a structural schematic diagram of the floating support mechanism of the present invention; in: 1. Base; 101. Mounting groove; 102. Mounting protrusion; 103. Mounting position; 104. Sloping surface; 105. Support grid; 106. First support rib; 107. Collection groove; 108. Second support rib; 2. First guide rail; 3. Transmission screw; 4. Sliding platform; 41. Connecting guard plate; 5. Floating support mechanism; 51. Second guide rail; 52. Floating support assembly; 521. Support block; 521a. Arc-shaped support part; 522. Support seat; 523. Floating block; 524. Guide column; 525. Elastic element; 53. Support slider; 54. Guide rod; 6. Ball nut; 61. Mounting plate; 7. Connecting plate; 8. Fixing block; 9. Transmission bracket; 10. Motor; 11. Coupling; 12. Fixing seat; 13. Bearing; 14. Pressure block.
[0017] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0018] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
[0019] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.
[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0022] Reference Figures 1 to 5 The present invention proposes a screw drive device with a floating support structure, including a base 1 and a first guide rail 2. The two first guide rails 2 are arranged on the upper end surface of the base 1 along the length direction of the base 1. The two ends of the base 1 are rotatably connected to a drive screw 3 parallel to the first guide rail 2. The drive screw 3 is threadedly connected to a sliding platform 4, and the sliding platform 4 is slidably connected to the first guide rail 2. A floating support mechanism 5 is provided below the transmission lead screw 3. The floating support mechanism 5 includes a second guide rail 51 parallel to the transmission lead screw 3. The second guide rail 51 is slidably connected to a floating support assembly 52. The floating support assembly 52 is provided with a support block 521. The support block 521 forms an arc-shaped support portion 521a. The arc-shaped support portion 521a slidably abuts against the transmission lead screw 3, and the radius of the arc-shaped support portion 521a is equal to the radius of the transmission lead screw 3.
[0023] In the above embodiment, the problem of sagging in the middle of the transmission screw 3 due to its own weight during long-distance transmission can be solved. Specifically, it includes a base 1, two parallel first guide rails 2, a transmission screw 3, and a sliding platform 4. The first guide rails 2 are arranged along the length of the base 1 on the upper surface of the base 1. The transmission screw 3 is fixed at opposite ends of the base 1 by a rotatable connection and is threadedly connected to the sliding platform 4. The sliding platform 4 slides along the first guide rails 2, specifically through a slider as an intermediate component to achieve a sliding connection, enabling the screw to drive the platform to perform linear motion. To further ensure the stability of the screw, a floating support mechanism 5 is provided below the transmission screw 3. The floating support mechanism 5 includes a second guide rail 51 arranged parallel to the screw, and a floating support assembly 52 is slidably connected to the second guide rail 51. The floating support assembly 52 has an arc-shaped support portion 521a, which contacts the screw and provides support force. The radius of the arc-shaped support portion 521a precisely matches the radius of the screw, thereby avoiding the restriction of the screw's degree of freedom of movement by rigid contact.
[0024] The arc-shaped support portion 521a of the floating support structure provides appropriate support force through sliding contact with the transmission lead screw 3, effectively solving the problem of mid-section sagging caused by gravity. The arc-shaped support portion 521a avoids excessive rigid constraints, ensuring the lead screw's freedom of movement during operation, allowing it to rotate smoothly without unnecessary friction or resistance. Furthermore, the matching radius between the arc-shaped support portion 521a and the lead screw ensures uniform contact between the support portion and the lead screw surface, thereby dispersing the support force acting on the lead screw and reducing stress concentration effects. This floating support structure not only provides continuous and stable support, effectively reducing lead screw bending and deformation, but also significantly reduces vibration and resonance problems caused by mid-section sagging, improving the lead screw's transmission accuracy and the device's operational stability. It avoids the accuracy loss and operational instability problems found in traditional lead screw transmission devices, thus improving the reliability and long-term durability of the transmission system.
[0025] refer to Figure 4 and Figure 5 In one embodiment, the floating support assembly 52 further includes a support base 522, which is slidably connected to the second guide rail 51 via a support slider 53. A floating block 523 is connected to the upper end face of the support base 522, and the support block 521 and the floating block 523 are detachably connected. The floating block 523 has buffer cavities formed at its two opposite ends. A guide post 524 passes through the buffer cavity. An elastic element 525 is arranged around the guide post 524. The two opposite ends of the elastic element 525 abut against the inner top wall of the buffer cavity and the upper end face of the support seat 522, so that the floating block 523 drives the arc-shaped support part 521a to fit against the transmission screw 3.
[0026] In the above embodiments, the floating support assembly 52 provides effective support and cushioning, ensuring the stability and efficient operation of the transmission system. Specifically, the floating support assembly 52 includes a support base 522, which is slidably connected to the second guide rail 51 via a support slider 53, allowing the support base 522 to move smoothly on the guide rail and adapt to dynamic requirements under different working conditions. A floating block 523 is connected to the upper end face of the support base 522, and the floating block 523 and the support block 521 are detachably connected, ensuring that the arc-shaped support portion 521a and the support block 521 can be replaced or repaired as needed without replacing the entire support assembly, thereby improving the maintenance and usage efficiency of the equipment and adapting to different transmission screws.
[0027] The floating block 523 has buffer cavities at both ends, and guide posts 524 are installed inside the buffer cavities. The function of the guide posts 524 is to maintain the stability of the floating block 523 during movement and prevent it from shifting laterally or vibrating irregularly. Elastic elements 525 surround the guide posts 524. Specifically, the elastic elements 525 are compression springs, with their two ends abutting against the inner top wall of the buffer cavity and the upper surface of the support seat 522, respectively. This allows the floating block 523 to withstand external impact forces during movement and effectively buffer these impact forces to avoid excessive load or vibration on the transmission screw 3. The floating block 523 not only allows the arc-shaped support part 521a to smoothly conform to the transmission screw 3, but also maintains the high efficiency and stability of the transmission system, extends the service life of the equipment, and reduces maintenance frequency.
[0028] In one example, the floating support assembly 52 includes two sets, with guide rods 54 fixedly connected to opposite sides of the two support seats 522. The guide rods 54 are arranged parallel to the transmission screw 3, and the two guide rods 54 are respectively arranged on opposite sides of the second guide rail 51.
[0029] In the above embodiment, the floating support assembly 52 includes two sets. Two guide rods 54 are fixedly connected to the support base 522 on opposite sides of each set of floating support assemblies 52, and these guide rods 54 are arranged parallel to the transmission lead screw 3. The guide rods 54 are located on both sides of the second guide rail 51, serving to support and control the synchronous advance and retreat of the two sets of floating support assemblies 52, limiting the movement trajectory of the floating support assemblies 52, and preventing the floating support assemblies 52 from deviating during operation. Especially when subjected to lateral forces, they can effectively maintain the stability of the support base 522. This is particularly suitable for mechanical transmission systems requiring high precision and long service life. The parallel guide rods 54 not only reduce the tilting or swaying of the support assembly, but also ensure a tighter and more stable fit between the lead screw and the floating support, thereby avoiding transmission errors caused by offset or asymmetrical support. This allows the floating support assembly 52 to distribute pressure more evenly when bearing load, further improving the overall operational stability of the device.
[0030] refer to Figure 1 and Figure 3 In one example, the transmission screw 3 is threadedly connected to a ball nut 6, and the bottom end of the sliding platform 4 extends to two symmetrically arranged connecting guard plates 41. The two connecting guard plates 41 are respectively connected to opposite sides of the ball nut 6. A disc-shaped mounting plate 61 is provided on one side of the ball nut 6, and a rectangular connecting plate 7 is connected to the side of the two connecting guard plates 41 facing the mounting plate 61. The connecting plate 7 is fixedly connected to the mounting plate 61 so that the sliding platform 4 is threadedly connected to the transmission screw 3 through the ball nut 6.
[0031] In the above embodiment, the lead screw drive maintains low friction and high transmission efficiency during use. The lead screw 3 is connected to the ball nut 6 via threads. The ball nut 6 significantly reduces the coefficient of friction, thereby improving transmission efficiency and reducing heat generation, ensuring stable performance of the system even during long-term operation. Two symmetrically arranged connecting guard plates 41 extend from the bottom end of the sliding platform 4. These two guard plates are respectively connected to opposite sides of the ball nut 6, ensuring a more secure and stable connection between the ball nut 6 and the sliding platform 4.
[0032] On one side of the ball nut 6, there is a disc-shaped mounting plate 61. Two connecting guard plates 41 are connected to rectangular connecting plates 7 near the mounting plate 61, and the connecting plates 7 are fixedly connected to the mounting plate 61. This allows the sliding platform 4 to be reliably connected to the transmission screw 3 via the ball nut 6, forming a stable transmission system. With the threaded connection of the ball nut 6, the sliding platform 4 can move smoothly on the screw with low friction and high transmission efficiency, adapting to high-load working environments without easily overheating. This connection method also avoids the instability caused by excessive friction or errors in traditional screw transmission systems, improving the working accuracy and reliability of the equipment.
[0033] The connection between the sliding platform 4 and the ball nut 6 is tighter, and it has a higher load capacity, making it suitable for fields that require efficient and stable transmission, such as precision machinery and automated devices.
[0034] refer to Figure 3 and Figure 4 In one example, the base 1 has an M-shaped cross-section, and the upper end face of the base 1 has a mounting groove 101 extending along the length direction. The inner bottom wall of the mounting groove 101 has a mounting protrusion 102 facing the transmission screw. The mounting protrusion 102 is provided with a mounting position 103. One side of the mounting position 103 is provided with an inclined surface 104. The second guide rail 51 is disposed in the mounting position 103. A fixing block 8 is installed in the inclined surface 104. The opposite sides of the fixing block 8 abut against the second guide rail 51 and the inclined surface of the inclined surface 104, respectively.
[0035] In the above embodiment, the base 1 has an M-shaped cross-section, providing good support and strength. The M-shaped structure allows the walls on both sides of the base 1 to form a relatively robust support angle, effectively dispersing the load pressure from the transmission screw 3 and ensuring the stability of the equipment during operation. A mounting groove 101 is formed along the length of the recessed portion of the M-shape on the upper end face of the base 1. A mounting protrusion 102 is provided on the bottom wall of the mounting groove 101 facing the transmission screw 3, providing precise positioning for subsequent component installation. A mounting position 103 is provided at the top of the mounting protrusion 102, and one side of the mounting position 103 has a slope 104. The structural characteristics of the slope 104 enable more precise pressure distribution.
[0036] A second guide rail 51 is installed within the mounting position 103. The second guide rail 51 acts as a sliding track, and its tight fit with the base 1 enhances the stability of the structure. A fixing block 8 is installed within the inclined surface position 104. One side of the fixing block 8 is flat, and the other side is inclined. The two sides of the fixing block 8 abut against the second guide rail 51 and the inclined surface of the inclined surface position 104, respectively, thus stabilizing the guide rail and fixing the structure. This ensures that the second guide rail 51 is not prone to displacement or loosening after installation, improving the stability and accuracy of the entire transmission system.
[0037] In one example, a support grid 105 is provided at the bottom end of the base 1, and a V-shaped first support rib 106 extends from the bottom end of the mounting groove 101. The end of the first support rib 106 away from the mounting groove 101 intersects and is fixed with the support grid 105.
[0038] In the above embodiment, the bottom end of the base 1 is optimized to further enhance its strength and load-bearing capacity. A support grid 105 is provided at the bottom end of the base 1, which not only enhances the overall strength of the base 1 but also provides additional support points to ensure that the load is evenly distributed when the base 1 is subjected to external pressure. The support grid 105 adopts a mesh structure, and its reasonable distribution prevents deformation of the bottom of the base 1 due to excessive concentrated force when bearing load, thereby extending the service life of the equipment.
[0039] Furthermore, a V-shaped first support rib 106 extends from the bottom of the mounting groove 101. The end of the first support rib 106 furthest from the mounting groove 101 intersects and is fixed to the support grid 105. The V-shaped structure effectively enhances the overall rigidity of the bottom of the base 1. The V-shaped support rib provides a more concentrated and stable supporting force, allowing the bottom of the base 1 to better maintain its shape when subjected to external impacts or gravity, avoiding deformation or structural loosening due to large external forces. Through the above structure, the base 1 can exhibit higher rigidity and stronger load-bearing capacity when the load increases, effectively improving the operational stability of the overall screw drive device.
[0040] In one embodiment, V-shaped collection grooves 107 extend from opposite sides of the base 1. The bottom of the collection grooves 107 is lower than the inner bottom wall of the mounting groove 101, and the bottom of the collection grooves 107 is connected to an array of second support ribs 108. The bottom ends of the second support ribs 108 intersect and are fixed to the support grid 105.
[0041] In the above embodiment, the rationality of load distribution and arrangement of the entire structure can be further enhanced. V-shaped collection grooves 107 extend from opposite sides of the base 1. These collection grooves 107 not only help lower the center of gravity of the base 1 when bearing load, but also effectively guide excess materials generated during transmission (such as dust, particles, and processing waste) into the collection grooves 107, preventing them from causing friction or affecting the base 1 and other transmission components. The bottom of the collection groove 107 is lower than the inner bottom wall of the mounting groove 101. This structure helps ensure that the collection groove 107 can hold more materials and avoids excessive accumulation of materials, which could affect the normal operation of the equipment.
[0042] At the bottom of the collection trough 107, an array of second support ribs 108 are installed. The bottom ends of the second support ribs 108 gradually converge inward and intersect and fix with the support grid 105. The function of the second support ribs 108 is to further enhance the stability and load-bearing capacity of the base 1, evenly distribute the external load, and prevent the base 1 from deforming due to excessive local stress. This allows the base 1 to maintain high rigidity during operation and effectively disperse any external pressure, making the operation of the entire transmission device more stable and reducing damage to the transmission screw 3 and other mechanical components.
[0043] refer to Figure 1 and Figure 2 In one embodiment, a transmission bracket 9 is fixedly connected to one side of the base 1. The transmission bracket 9 extends obliquely upward toward the side away from the base 1, and a motor 10 is fixedly connected to the side of the transmission bracket 9 away from the base 1. The output shaft of the motor 10 passes through the transmission bracket 9, and the output shaft of the motor 10 is fixedly connected to the transmission lead screw 3 through a coupling 11.
[0044] In the above embodiment, a transmission bracket 9 is fixedly connected to one side of the base 1. The transmission bracket 9 supports and mounts the motor 10 and ensures precise transmission between the motor 10 and the transmission screw 3. The transmission bracket 9 extends obliquely upward away from the base 1. This oblique structure allows the transmission bracket 9 to be flexibly adjusted during installation, facilitating cooperation with other structural parts and effectively reducing additional stress concentration caused by deviation of the transmission axis. The motor 10 is connected to the transmission screw 3 through its output shaft, which passes through the transmission bracket 9. This not only reduces the space occupied during installation but also improves transmission efficiency by directly transmitting power.
[0045] Coupling 11 securely connects the output shaft of motor 10 to lead screw 3, ensuring that the power of motor 10 can be accurately transmitted to lead screw 3, thereby driving the lead screw to rotate and realizing the function of the mechanical device. The function of coupling 11 is to compensate for minor axial errors between motor 10 and lead screw 3, preventing unstable transmission or reduced transmission efficiency due to axial misalignment or slight vibration. In summary, the transmission accuracy of the entire lead screw drive device is effectively improved, and it remains stable even under high load operation.
[0046] In one embodiment, a fixing seat 12 is provided on both sides of the mounting groove 101, and a bearing 13 is connected between the two fixing seats 12. The bearing 13 is sleeved on the outside of the transmission screw 3, and an arch-shaped pressure block 14 is provided above the bearing 13. The opposite sides of the pressure block 14 are fixedly connected to the fixing seat 12 respectively.
[0047] In the above embodiment, fixed seats 12 are respectively provided on opposite sides of the mounting groove 101. The two fixed seats 12 provide support and positioning for the transmission screw, ensuring that the transmission screw 3 can maintain a stable position throughout the entire working process and is not prone to displacement. A bearing 13 is connected between the two fixed seats 12. The bearing 13 allows the transmission screw 3 to rotate freely within the mounting groove 101. The bearing 13 is sleeved on the outside of the transmission screw 3, which can effectively avoid friction problems caused by poor contact between the inner and outer parts of the bearing 13, thereby reducing wear and extending service life. Furthermore, a pair of fixed seats 12 as described above are provided at both ends of the transmission bearing 13.
[0048] Above the bearing 13, an arch-shaped pressure block 14 is installed to further secure the bearing 13 and increase the stability of the support. The pressure block 14 can evenly distribute the pressure from all directions, ensuring that the tight fit between the bearing 13 and the fixed seat 12 is not disturbed by external factors during the operation of the transmission screw 3. The two sides of the pressure block 14 are fixedly connected to the fixed seat 12 respectively. Through the above structure, the stability of the entire mounting groove 101 is further enhanced, ensuring the smooth operation of the transmission screw 3 during the working process and avoiding vibration or irregular movement caused by unstable fixing.
[0049] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.
Claims
1. A screw drive device with a floating support structure, characterized in that, Includes a base (1) and a first guide rail (2). The two first guide rails (2) are arranged on the upper surface of the base (1) along the length direction of the base (1). The base (1) is rotatably connected to the opposite ends by a transmission screw (3) parallel to the first guide rail (2). The transmission screw (3) is threadedly connected to a sliding platform (4). The sliding platform (4) is slidably connected to the first guide rail (2). A floating support mechanism (5) is provided below the transmission screw (3). The floating support mechanism (5) includes a second guide rail (51) parallel to the transmission screw (3). The second guide rail (51) is slidably connected to a floating support assembly (52). The floating support assembly (52) is provided with a support block (521). The support block (521) forms an arc-shaped support part (521a). The arc-shaped support part (521a) slides against the transmission screw (3), and the radius of the arc-shaped support part (521a) is equal to the radius of the transmission screw (3).
2. The screw drive device with floating support structure according to claim 1, characterized in that, The floating support assembly (52) also includes a support base (522), which is slidably connected to the second guide rail (51) via a support slider (53). A floating block (523) is connected to the upper end face of the support base (522), and the support block (521) and the floating block (523) are detachably connected. The floating block (523) has buffer cavities formed at its opposite ends. A guide post (524) is inserted into the buffer cavity. An elastic element (525) is arranged around the guide post (524). The opposite ends of the elastic element (525) abut against the inner top wall of the buffer cavity and the upper end face of the support seat (522), so that the floating block (523) drives the arc-shaped support part (521a) to fit against the transmission screw (3).
3. The screw drive device with floating support structure according to claim 2, characterized in that, The floating support assembly (52) includes two sets. Guide rods (54) are fixedly connected to the opposite side of the two support seats (522). The guide rods (54) are arranged parallel to the transmission screw (3). The two guide rods (54) are respectively arranged on opposite sides of the second guide rail (51).
4. The screw drive device with floating support structure according to claim 1, characterized in that, The transmission screw (3) is threadedly connected to a ball nut (6). The bottom end of the sliding platform (4) extends to two symmetrically arranged connecting guards (41). The two connecting guards (41) are respectively connected to the opposite sides of the ball nut (6). A disc-shaped mounting plate (61) is provided on one side of the ball nut (6). A rectangular connecting plate (7) is connected to the side of the two connecting guards (41) facing the mounting plate (61). The connecting plate (7) is fixedly connected to the mounting plate (61) so that the sliding platform (4) is threadedly connected to the transmission screw (3) through the ball nut (6).
5. A screw drive device with a floating support structure according to claim 1, characterized in that, The base (1) has an M-shaped cross section, and the upper end face of the base (1) is provided with a mounting groove (101) extending along the length direction. The inner bottom wall of the mounting groove (101) is formed with a mounting protrusion (102) facing the transmission screw. The mounting protrusion (102) is provided with a mounting position (103). One side of the mounting position (103) is provided with a slope position (104). The second guide rail (51) is located in the mounting position (103). A fixing block (8) is installed in the slope position (104). The opposite sides of the fixing block (8) abut against the second guide rail (51) and the slope of the slope position (104) respectively.
6. A screw drive device with a floating support structure according to claim 5, characterized in that, The base (1) is provided with a support grid (105) at the bottom end, and a V-shaped first support rib (106) extends from the bottom end of the mounting groove (101). The end of the first support rib (106) away from the mounting groove (101) intersects and is fixed with the support grid (105).
7. A screw drive device with a floating support structure according to claim 6, characterized in that, The base (1) has V-shaped collection grooves (107) extending on opposite sides. The bottom of the collection grooves (107) is lower than the inner bottom wall of the mounting groove (101). The bottom of the collection grooves (107) is connected to an array of second support ribs (108). The bottom of the second support ribs (108) intersects and is fixed to the support grid (105).
8. A screw drive device with a floating support structure according to claim 1, characterized in that, A transmission bracket (9) is fixedly connected to one side of the base (1). The transmission bracket (9) extends obliquely upward toward the side away from the base (1). A motor (10) is fixedly connected to the side of the transmission bracket (9) away from the base (1). The output shaft of the motor (10) passes through the transmission bracket (9). The output shaft of the motor (10) is fixedly connected to the transmission screw (3) through a coupling (11).
9. A screw drive device with a floating support structure according to claim 5, characterized in that, Fixed seats (12) are provided on both sides of the mounting groove (101), and a bearing (13) is connected between the two fixed seats (12). The bearing (13) is sleeved on the outside of the transmission screw (3), and an arch-shaped pressure block (14) is provided above the bearing (13). The two sides of the pressure block (14) are fixedly connected to the fixed seats (12) respectively.