Screw rod driving device

Abstract

The utility model provides a lead screw driving device, which is characterized by comprising a track profile, a lead screw mounted in the track profile, a motor component arranged at one end of the track profile, a nut nested on the lead screw, and track adapters arranged at two ends of the nut in a relatively sliding and staggered manner. A dislocation sliding block is arranged between the rail adapters and the nut in a sliding mode, a fixing piece is arranged on the outer side of the rail profile, the two rail adapters are fixedly connected with the fixing piece, a dislocation gap is reserved between the nut and the inner wall of the rail profile, and the diameter of an inner hole of the rail adapters and the diameter of an inner hole of the dislocation sliding block are larger than the diameter of the lead screw. A cross-shaped sliding block coupling structure is formed among the nut, the rail adapter and the staggered sliding block; according to the utility model, the influence of non-concentric installation between the rail section bar and the screw rod and deflection deformation of the screw rod on the movement of the nut can be eliminated, the problem that the nut is blocked or stuck in the movement process is solved, and a loaded object can stably translate.

Description

[Technical field]

[0001] The utility model relates to the technical field of screw transmission, in particular to a screw driving device. [Background technology]

[0002] Screw drive devices are often used in automatic transmission fields such as automatic sliding doors, automatic screens, automatic curtains, mechanical modules, etc. that require parallel movement of objects.

[0003] In the actual application of the screw drive device, the screw needs to be fixed in the track profile. The track profile supports both ends of the screw and also provides track constraints. In the existing screw drive device, the nut directly contacts the track of the track profile. The nut on the screw drives the load object and moves as parallel as possible along the track on the track profile. However, due to the tolerance of parts and the error caused by the installation of the screw, the axis of the screw and the center line of the track profile are easily deviated after installation. The track gap between the track profile and the screw is not equal, and it is difficult for the nut to pass smoothly through a narrow area, which can easily cause the nut to get stuck or stuck during movement.

[0004] Moreover, when the length of the screw rod is long, the screw rod itself will produce deflection deformation due to processing problems and the influence of gravity, affecting the operation of the screw rod drive device, making it difficult to ensure that the nut drives the load object to move parallely. The track gap between the track profile and the screw rod will also be affected by the deflection deformation of the screw rod, causing the nut to get stuck or stuck during movement.

[0005] In order to solve the above problems, the utility model provides a new screw drive device structure. [Contents of the utility model]

[0006] In order to eliminate the influence of the installation eccentricity between the track profile and the screw rod and the deflection deformation of the screw rod on the movement of the nut, solve the problem of the nut getting stuck or stuck during the movement, and enable the loaded object to stably translate along the track of the track profile, the utility model provides a screw rod drive device.

[0007] In order to solve the above problems, the utility model provides the following technical solutions:

[0008] A screw drive device, characterized in that: it includes a track profile, a screw is installed in the track profile, a motor assembly for driving the screw to rotate is provided at one end of the track profile, a nut is nested on the screw, track adapters that can slide and displace relatively at both ends of the nut and are engaged with the internal track of the track profile are provided, a dislocation slider is provided that can slide between the track adapter and the nut, a fixing piece for connecting a load object is provided on the outside of the track profile, two track adapters at both ends of the nut are fixedly connected to the fixing piece, an dislocation gap is left between the nut and the inner wall of the track profile, the inner hole diameters of the track adapter and the dislocation slider are larger than the diameter of the screw, and a cross slider coupling structure is formed between the nut, the track adapter and the dislocation slider.

[0009] The screw drive device as described above is characterized in that: a first offset groove is symmetrically provided at both ends of the nut, and a second offset groove is provided at one end of the track adapter close to the nut, the extension directions of the first offset groove and the second offset groove are perpendicular to each other, and the offset slider can be slidably embedded in the first offset groove and the second offset groove.

[0010] The screw drive device as described above is characterized in that: a first limit baffle is provided on both sides of the first offset slide groove, and a second limit baffle is provided on both sides of the second offset slide groove, the first limit baffle and the second limit baffle are interlocked with each other, and the width of the first limit baffle and the second limit baffle does not exceed the width of the offset slider.

[0011] The screw drive device as described above is characterized in that: the track adapter includes a dislocation piece and a connecting piece, the dislocation piece is cylindrical and has an outer diameter greater than the outer diameter of the nut, an open slide is provided on one side of the track profile, and the connecting piece is embedded in the open slide.

[0012] The screw drive device as described above is characterized in that a screw hole is provided at the bottom end of the connecting member, and a fixing hole is correspondingly provided on the fixing member.

[0013] The screw drive device as described above is characterized in that: end covers for supporting the screw are provided at both ends of the track profile, and bearings are nested in the end covers and located at both ends of the screw.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] The screw drive device of the utility model is provided with a nut, a track adapter and an offset slider to form a cross slider coupling structure, an offset gap is left between the nut and the inner wall of the track profile, when the nut moves along the screw driven by the screw, even if the axis of the screw and the center line of the track profile deviate after installation, the track gap between the track profile and the screw is not equal, when the nut passes through a narrow area, a sliding dislocation is generated between the track adapter and the nut through the offset slider, so that the track adapter continues to slide along the track in the track profile, and the nut moves on the screw, thereby avoiding the nut from getting stuck or stuck during the movement, allowing the nut to pass smoothly and ensuring that the loaded object maintains translation; similarly, even if the screw itself produces deflection deformation due to processing problems and the influence of gravity, the nut and the track adapter can solve the problem of the nut getting stuck or stuck during the movement through dislocation, so that the object fixedly connected on the fixing member can stably translate along the track in the track profile under the push of the nut.

Brief Description of the Drawings

[0016] Figure 1 is a stereoscopic diagram of the screw drive device;

[0017] Figure 2 is a top view of the screw drive device;

[0018] Figure 3 yes Figure 2 Sectional view in the AA direction;

[0019] Figure 4 yes Figure 3 Enlarged view of area D in the middle;

[0020] Figure 5 is a first exploded view of the screw drive device;

[0021] Figure 6 is a second exploded view of the screw drive device;

[0022] In the figure: 1 is a track profile; 2 is a motor assembly; 3 is a screw rod; 4 is a nut; 5 is a track adapter; 6 is an offset slider; 7 is a fixing member; 8 is an offset member; 9 is a connecting member; 10 is an open slideway; 11 is a first offset chute; 12 is a second offset chute; 13 is a first limit baffle; 14 is a second limit baffle; 15 is a screw hole; 16 is a fixing hole; 17 is an end cover; 18 is a bearing. [Specific implementation method]

[0023] The technical features of the present invention are further described in detail below with reference to the accompanying drawings so that those skilled in the art can understand them.

[0024] A screw drive device, such as Figure 1 to Figure 6As shown, it includes a track profile 1, a screw rod 3 is installed in the track profile 1, a motor assembly 2 for driving the screw rod 3 to rotate is provided at one end of the track profile 1, a nut 4 is nested on the screw rod 3, and track adapters 5 that are embedded with the internal track of the track profile 1 are provided at both ends of the nut 4 so as to be relatively slidable and displaced. The track adapter 5 is slidably abutted against the inner wall of the track profile 1, so that the track adapter 5 is constrained by the track inside the track profile 1 and slides and translates along the track, while the nut 4 only moves along the screw rod 3 and does not contact the inner wall of the track profile 1, so that there is a dislocation space between the nut 4 and the track adapter 5, and a slidable device between the track adapter 5 and the nut 4 is provided. There is a dislocation slider 6, and a fixing part 7 for connecting a load object is provided on the outer side of the track profile 1. The two track adapters 5 at both ends of the nut 4 are fixedly connected to the fixing part 7, so that the track adapters 5 at both ends of the nut 4 are squeezed together to prevent the dislocation slider 6 from falling off. A dislocation gap is left between the nut 4 and the inner wall of the track profile 1. The inner hole diameters of the track adapter 5 and the dislocation slider 6 are larger than the diameter of the screw rod 3, so that the dislocation slider 6 has space for sliding dislocation. A cross slider coupling structure is formed between the nut 4, the track adapter 5 and the dislocation slider 6, which can prevent the nut 4 from rotating with the screw rod 3 while realizing the sliding dislocation function, so as to ensure the normal movement of the nut 4.

[0025] Specifically, the nut 4 moves along the screw rod 3 driven by the screw rod 3. When the axis of the screw rod 3 deviates from the center line of the track profile 1 after installation, the track gap between the track profile 1 and the screw rod 3 is not equal. When the nut 4 passes through a narrow area, the track adapter 5 and the nut 4 are slidingly dislocated through the offset slider 6, so that the track adapter 5 continues to slide along the track on the track profile 1, and the nut 4 moves normally on the screw rod 3, thereby avoiding the nut 4 from getting stuck or stuck in a narrow area, and at the same time, it can ensure that the object fixedly connected to the fixing member 7 can be stably translated along the track in the track profile 1 under the push of the nut 4; similarly, even if the screw rod 3 itself will produce deflection deformation due to processing problems and the influence of gravity, the nut 4 and the track adapter 5 can solve the problem of the nut 4 getting stuck or stuck during movement through dislocation, so as to ensure the stable translation of the loaded object.

[0026] Specifically, a first offset groove 11 is symmetrically provided at both ends of the nut 4, and a second offset groove 12 is provided at one end of the track adapter 5 close to the nut 4. The extension directions of the first offset groove 11 and the second offset groove 12 are perpendicular to each other. The offset slider 6 can be slidably installed in the first offset groove 11 and the second offset groove 12. The first offset groove 11 and the second offset groove 12 respectively provide transverse and longitudinal offset directions, so that the track adapter 5 and the nut 4 can generate multi-angle relative offset positions.

[0027] In addition, a first limit baffle 13 is provided on both sides of the first misaligned slide groove 11, and a second limit baffle 14 is provided on both sides of the second misaligned slide groove 12. The first limit baffle 13 and the second limit baffle 14 are respectively fitted with the four sides of the misaligned slider 6, and can prevent the misaligned slider 6 from shaking during the movement of the nut 4 without restricting the sliding misalignment, so that the operation of the screw drive device is more stable. The first limit baffle 13 and the second limit baffle 14 are interlocked with each other, which can prevent the nut 4 from rotating with the screw 3 to ensure that the nut 4 translates with the rotation of the screw 3. The width of the first limit baffle 13 and the second limit baffle 14 does not exceed the width of the misaligned slider 6 to prevent affecting the sliding misalignment between the nut 4 and the track adapter 5.

[0028] Specifically, the track adapter 5 includes a dislocation piece 8 and a connecting piece 9. The dislocation piece 8 is cylindrical and has an outer diameter greater than the outer diameter of the nut 4, so that the nut 4 does not contact the inner wall of the track profile 1, thereby leaving a dislocation space between the nut 4 and the track adapter 5. An open slide 10 is provided on one side of the track profile 1. The connecting piece 9 is embedded in the open slide 10, which can effectively limit the activity space of the track adapter 5 and the fixing piece 7, so that they can only slide along the track in the track profile 1 and the open slide 10, preventing the track adapter 5 from swinging due to the rotation of the screw rod 3, thereby making the loaded object stably translate.

[0029] In addition, a screw hole 15 is provided at the bottom end of the connecting member 9, and a corresponding fixing hole 16 is provided on the fixing member 7. The rail adapter 5 and the fixing member 7 are fixedly connected by screws passing through the fixing hole 16 and then screwed into the screw hole 15, so that the two rail adapters 5 are respectively embedded and fixed at the two ends of the nut 4.

[0030] Specifically, end covers 17 for supporting the screw rod 3 are provided at both ends of the rail profile 1, and bearings 18 are nested in the end covers 17 and at both ends of the screw rod 3. The bearings 18 can reduce the rotational friction of the screw rod 3, so that the screw rod drive device runs more smoothly.

[0031] The embodiments described in the present invention are merely descriptions of preferred implementation modes of the present invention and are not limited to the precise structures described above and shown in the accompanying drawings. Various modifications and changes can be made without departing from the scope thereof. Without departing from the design concept of the present invention, various modifications and improvements made to the technical solutions of the present invention by engineers and technicians in this field should all fall within the protection scope of the present invention.

Claims

1. A screw drive device, characterized in that: The invention comprises a track profile (1), a screw rod (3) is installed in the track profile (1), a motor assembly (2) is provided at one end of the track profile (1) for driving the screw rod (3) to rotate, a nut (4) is embedded in the screw rod (3), track adapters (5) which are relatively slidable and displaced at both ends of the nut (4) and are engaged with the internal track of the track profile (1), a dislocation slider (6) is slidable between the track adapter (5) and the nut (4), and a motor assembly (2) is provided at one end of the track profile (1) for driving the screw rod (3) to rotate, a nut (4) is embedded in the screw rod (3), a track adapter (5) which is relatively slidable and displaced at both ends of the nut (4) and is engaged with the internal track of the track profile (1) is provided, and a dislocation slider (6) is provided between the track adapter (5) and the nut (4) to be displaced. A fixing part (7) for connecting a load object is provided on the outer side of the track profile (1); the two track adapter parts (5) at both ends of the nut (4) are fixedly connected to the fixing part (7); an offset gap is left between the nut (4) and the inner wall of the track profile (1); the inner hole diameters of the track adapter part (5) and the offset slider (6) are larger than the diameter of the screw rod (3); and a cross slider coupling structure is formed between the nut (4), the track adapter part (5) and the offset slider (6).

2. The screw drive device according to claim 1, characterized in that: A first offset groove (11) is symmetrically provided at both ends of the nut (4), and a second offset groove (12) is provided at one end of the track adapter (5) close to the nut (4). The extension directions of the first offset groove (11) and the second offset groove (12) are perpendicular to each other, and the offset slider (6) can be slidably mounted in the first offset groove (11) and the second offset groove (12).

3. The screw drive device according to claim 2, characterized in that: A first limit baffle (13) is provided on both sides of the first misaligned slide groove (11), and a second limit baffle (14) is provided on both sides of the second misaligned slide groove (12), the first limit baffle (13) and the second limit baffle (14) are interlocked, and the width of the first limit baffle (13) and the second limit baffle (14) does not exceed the width of the misaligned slide block (6).

4. The screw drive device according to claim 1, characterized in that: The track adapter (5) comprises a dislocation piece (8) and a connecting piece (9); the dislocation piece (8) is cylindrical and has an outer diameter greater than the outer diameter of the nut (4); an open slideway (10) is provided on one side of the track profile (1), and the connecting piece (9) is embedded in the open slideway (10).

5. The screw drive device according to claim 4, characterized in that: A screw hole (15) is provided at the bottom end of the connecting member (9), and a fixing hole (16) is correspondingly provided on the fixing member (7).

6. The screw drive device according to claim 1, characterized in that: End covers (17) for supporting the screw rod (3) are provided at both ends of the track profile (1), and bearings (18) are nested inside the end covers (17) and at both ends of the screw rod (3).

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