Guide-rail-free linear driving mechanism
Through the combination of the inclined structure and the rolling element, the circumferential rotation of the slider is restricted and the axial movement is ensured, which solves the problem of large volume of the linear drive mechanism and achieves a small and stable linear drive effect.
Patent Information
- Application Number
- CN202411415645.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-11
- Publication Date
- 2024-12-20
AI Technical Summary
The existing linear drive mechanism relies on linear slides, which makes it large in size and difficult to apply to equipment in narrow spaces.
The circumferential limit of the slider is achieved by using an inclined structure and several rolling elements to ensure that the slider can only move in the axial direction. It cooperates with the internal threaded channel of the screw and the slider, and combines the drive motor and encoder to achieve precise control and compactness. linear drive.
It realizes the stable and reliable operation of the linear drive mechanism without rails and the compact design of the overall structure, and is suitable for equipment in narrow spaces.
Smart Images
Figure CN119163734A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a linear drive mechanism, and in particular to a guide rail-free linear drive mechanism. Background Art
[0002] At present, all the linear drive mechanisms on the market rely on linear rails to limit the moving trajectory of the slider, thereby guiding the slider to move along the predetermined trajectory. Linear rails usually need to be set in pairs, and the presence of a pair of linear rails will greatly increase the overall volume of the linear drive mechanism. However, for equipment used in narrow spaces, the linear drive mechanism on it is naturally the smaller the overall volume, the better. Summary of the invention
[0003] The technical problem to be solved by the present invention is to provide a guide rail-free linear drive mechanism with a small volume and stable and reliable operation.
[0004] In order to solve the problem of large volume of the linear slide rail solution, the present invention adopts two inclined structures and a plurality of rolling bodies to realize the circumferential limit of the slider, and the specific structure is as follows: The present invention provides a guide rail-free linear drive mechanism, comprising: a housing, a screw rod supported and arranged in the housing in a front-to-back horizontal direction by a bearing group, a slider with an internal thread channel screwed on the screw rod through the internal thread channel; the top of the slider is composed of a connecting portion protruding upward in the middle and inclined planes arranged on the left and right sides of the connecting portion, an elongated mounting groove is provided inwardly on each inclined plane, a supporting plate is placed in each elongated mounting groove, a plurality of rolling element supporting holes are provided on the supporting plate, and each rolling element supporting hole is arranged in a line from front to back, a rolling element is placed in each rolling element supporting hole, and the height of the rolling element in the groove depth direction corresponding to the elongated mounting groove is greater than the groove depth of the elongated mounting groove where the rolling element is located; The cover plate on the top of the box body is composed of a middle cover plate and inclined cover plates arranged on the left and right sides of the middle cover plate. An elongated through slot is provided on the middle cover plate, and the connecting portion on the slider extends into the elongated through slot and the top of the connecting portion protrudes out of the elongated through slot; the inclinations of the two inclined cover plates correspond to the two side inclined planes on the slider, and a gap is left between each inclined cover plate and the corresponding inclined plane on the slider; a slide plate is installed on the inner side of each inclined cover plate, and the two slide plates are in contact with each rolling body in the elongated mounting slot on the corresponding side, and each rolling body rolls in contact with the corresponding slide plate during the movement of the slider in the front-rear direction; The box body is provided with a driving mechanism for driving the screw rod to rotate forward or reversely around its own axis, thereby causing the slider to move horizontally from front to back or from back to front. When the guide rail-free linear driving mechanism described in the present invention is applied to a device, the structure on the device that needs to be driven to perform linear motion is installed on the top of the connecting portion of the slider.
[0005] In the field of mechanical manufacturing, there are many forms of drive mechanisms. Considering factors such as overall volume and manufacturing cost, the drive mechanism selects the following structure: a drive motor is fixedly installed in the casing, a first gear is fixedly installed on the motor shaft of the drive motor, and a second gear meshing with the first gear is fixedly installed on the screw.
[0006] In order to accurately control the stroke of the slider, the present solution also has an encoder fixedly installed in the box, and a third gear meshing with the first gear is fixedly installed on the shaft of the encoder; in addition, in order to further reduce the overall volume of the guideless linear drive mechanism, the screw, drive motor, and encoder are arranged in sequence from top to bottom in the box.
[0007] In addition, a pressure adjustment mechanism is provided between each inclined cover plate and the corresponding slide plate, which enables the slide plate to contact the rolling elements in the corresponding long installation groove at a certain set pressure. The pressure adjustment mechanism is as follows: an elongated embedding groove is provided inwardly on the inner side wall of the inclined cover plate, the slide plate is embedded in the elongated embedding groove, and a plurality of threaded through holes are provided on the outer side wall of the inclined cover plate, each threaded through hole penetrates the bottom of the elongated embedding groove, and each threaded through hole is arranged in a straight line from front to back, a screw is screwed into each threaded through hole, and the bottom of each screw abuts against the slide plate.
[0008] Furthermore, in the aforementioned guide rail-less linear drive mechanism, the rolling body is preferably a ball, and in this case, the rolling body support hole is a circular support through hole that can accommodate the ball.
[0009] Furthermore, in the aforementioned guide rail-less linear drive mechanism, the inclined planes located on the left and right sides of the connecting portion are symmetrically distributed with respect to the vertical center plane of the connecting portion, and any inclined plane forms an angle of 45° with the vertical center plane of the connecting portion.
[0010] Furthermore, in the aforementioned guide rail-less linear drive mechanism, the slider with the internal threaded channel is composed of an inner sleeve and an outer slider, a through hole is provided on the outer slider for the inner sleeve to be embedded, the inner sleeve is fixedly connected to the outer slider by a plurality of fastening screws, and the inner wall of the inner sleeve is an internal threaded channel matching the external threaded section on the screw.
[0011] Furthermore, in the aforementioned guide rail-less linear drive mechanism, a first limit collar and a second limit collar are provided on the screw, and the slider is located on the screw between the first limit collar and the second limit collar, and the slider can only slide in the area between the first limit collar and the second limit collar.
[0012] The beneficial effects of the present invention are as follows: the screw rod and the internal threaded channel on the slider are used in combination, so that only the two degrees of freedom of the slider, namely circumferential rotation and axial movement, are not restricted. On this basis, two inclined structures and a plurality of rolling bodies are used in combination to limit the slider circumferentially, so that the slider can only have one degree of freedom, namely axial movement. Such a structural design can ensure that the guideless linear drive structure can operate stably and reliably, and can also ensure that the overall structure of the guideless linear drive mechanism is compact. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural schematic diagram of a guide rail-free linear drive mechanism described in the present invention.
[0014] Figure 2 It is a schematic diagram of the internal structure of a guide rail-free linear drive mechanism described in the present invention after removing the box body.
[0015] Figure 3 yes Figure 1 Schematic diagram of the structure in direction A.
[0016] Figure 4 yes Figure 3 Schematic diagram of the structure in the BB section direction.
[0017] Figure 5 yes Figure 3 Schematic diagram of the structure in the CC section direction.
[0018] Figure 6 yes Figure 5 Schematic diagram of the local enlarged structure of part D in the middle.
[0019] Figure 7 yes Figure 3 Schematic diagram of the structure from the right side.
[0020] Figure 8 yes Figure 7 Schematic diagram of the structure in the EE section direction.
[0021] Fig. 9 yes Figure 8 Schematic diagram of the structure of the middle slider.
[0022] Fig.10 yes Figure 8 Schematic diagram of the structure in the F direction.
[0023] in: 1. Box body; 11. Middle cover plate; 111. Long through groove; 12. Inclined cover plate; 121. Long embedded groove; 122. Threaded through hole; 2. Screw; 21. Bearing group; 22. First limit collar; 23. Second limit collar; 3. Slider; 31. External slider; 311. Connecting part; 312. Inclined plane; 313. Long mounting groove; 32. Inner sleeve; 321. Inner threaded channel; 4. Support plate; 41. Rolling body support hole; 42. Rolling body; 5. Slide plate; 6. Screw; 7. Drive motor; 8. Encoder; 91. First gear; 92. Second gear; 93. Third gear. DETAILED DESCRIPTION
[0024] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and preferred embodiments.
[0025] For the convenience of description, this embodiment uses Figure 3 The left-hand direction is defined as "left", with Figure 3 The right-hand direction is defined as "right", and combined with Figure 4 ,by Figure 4 The left-hand direction is defined as "back", with Figure 4 The right-hand direction is defined as "front", and all directional words involving "left", "right", "front", and "rear" in this article are based on this definition. It should be noted that the direction defined here is only for the convenience of describing the relative positions of various components, and does not limit the installation direction of the guideless linear drive mechanism. The installation direction of the guideless linear drive mechanism can be Figure 1 The horizontal installation direction shown can also be installed vertically or at any tilt angle. The installation direction depends on actual needs.
[0026] like Figure 1 , Figure 2 , Figure 4 and Figure 8 As shown, a guide rail-free linear drive mechanism described in this embodiment includes: a housing 1, a screw rod 2 is supported in the housing 1 in a front-to-back horizontal direction through a bearing group 21, and a slider 3 with an internal thread channel 321 is screwed on the screw rod 2 through the internal thread channel 321. The slider 3 with the internal thread channel 321 can be an integrated integral structure, or a structure composed of an inner sleeve 32 and an outer slider 31, a through hole for the inner sleeve 32 to be embedded is provided on the outer slider 31, the inner sleeve 32 is fixedly connected to the outer slider 31 by a plurality of fastening screws, and the inner wall of the inner sleeve 32 is an internal thread channel 321 matching the external thread section on the screw rod 2.
[0027] like Figure 2 , Figure 5 , Figure 6 and Fig. 9As shown, the top of the slider 3 is composed of a connecting portion 311 protruding upward in the middle and inclined planes 312 arranged on the left and right sides of the connecting portion 311. A long installation groove 313 is opened inward on each inclined plane 312, and a support plate 4 is placed in each long installation groove 313. A plurality of rolling body support holes 41 are opened on the support plate 4. The rolling body support holes 41 are arranged in a straight line from front to back. A rolling body 42 is placed in each rolling body support hole 41. At this time, the support plate 4 plays a role in separating the rolling bodies 42 to ensure that the rolling bodies 42 do not interfere with each other and roll separately. In addition, the height of the rolling body 42 in the groove depth direction of the corresponding long installation groove 313 is greater than the groove depth of the long installation groove 313 where the rolling body 42 is located.
[0028] In this embodiment, the inclined planes 312 arranged on the left and right sides of the connection portion 311 can be symmetrically arranged on the left and right sides of the connection portion 311, or can be asymmetrically arranged on the left and right sides of the connection portion 311. Preferably, the inclined planes 312 arranged on the left and right sides of the connection portion 31 are symmetrically distributed relative to the vertical center plane of the connection portion 311, and the angle α between any inclined plane 312 and the vertical center plane of the connection portion 311 is 45°.
[0029] In this embodiment, the rolling body 42 is preferably a ball. At this time, the rolling body support hole 41 is a circular support through hole that can accommodate the ball.
[0030] like Figure 1 , Figure 2 , Figure 3 , Figure 7 , Fig. 9 and Fig.10 As shown, the cover plate on the top of the box body 1 is composed of a middle cover plate 11 and inclined cover plates 12 arranged on the left and right sides of the middle cover plate 11. An elongated through groove 111 is opened on the middle cover plate 11, and the connecting portion 311 on the slider 3 extends into the elongated through groove 111 and the top of the connecting portion 311 protrudes out of the elongated through groove 111; the inclinations of the two inclined cover plates 12 correspond to the two side inclined planes 312 on the slider 3, and a gap is left between each inclined cover plate 12 and the corresponding inclined plane 312 on the slider 3; a slide plate 5 is installed on the inner side of each inclined cover plate 12, and the two slide plates 5 are respectively in contact with each rolling body 42 in the elongated mounting groove 313 on the corresponding side. At this time, the slider 3 is circumferentially restricted by the two slide plates 5 and the rolling bodies 42 in the two long mounting grooves 313 and cannot rotate circumferentially. It can only be forced to move axially along the axis direction of the screw 2 when the screw 2 rotates. During the axial sliding process of the slider 3, each rolling body 42 is in rolling contact with the corresponding slide plate 5.
[0031] A pressure regulating mechanism is provided between each inclined cover plate 12 and the corresponding slide plate 5 so that the slide plate 5 contacts the rolling elements 42 in the corresponding elongated mounting groove 313 at a certain set pressure. Figure 8 and Fig.10 As shown, the pressure regulating mechanism is as follows: an elongated embedding groove 121 is provided inwardly on the inner side wall of the inclined cover plate 12, the slide plate 5 is embedded in the elongated embedding groove 121, and a plurality of threaded through holes 122 are provided on the outer side wall of the inclined cover plate 12, each threaded through hole 122 penetrates the bottom of the elongated embedding groove 121, and each threaded through hole 122 is arranged in a straight line from front to back, and a screw 6 is screwed into each threaded through hole 122, and the bottom of each screw 6 is against the slide plate 5. The pressure of the screw 6 on the slide plate 5 is adjusted by the depth of screwing in the screw 6, so as to ensure that the cooperation between the slide plate 5 and the rolling body 42 can better and more smoothly make the slider 3 move axially without shaking when the screw rod 2 rotates.
[0032] In addition, if Figure 2 and Figure 4 As shown, in this embodiment, a first limit collar 22 and a second limit collar 23 are further provided on the screw rod 2, and the slider 3 is located on the screw rod 2 between the first limit collar 22 and the second limit collar 23. At this time, the slider 3 can only slide in the area between the first limit collar 22 and the second limit collar 23.
[0033] The box body 1 is provided with a driving mechanism for driving the screw rod 2 to rotate forward or reversely around its own axis, so that the connecting portion 311 on the slider 3 moves horizontally from front to back or from back to front in the long through slot 111. Figure 2 and Figure 4 As shown, the driving mechanism is as follows: a driving motor 7 is fixedly installed in the housing 1, a first gear 91 is fixedly installed on the motor shaft of the driving motor 7, and a second gear 92 meshing with the first gear 91 is fixedly installed on the screw 2. In order to accurately control the stroke of the slider 3, an encoder 8 is also fixedly installed in the housing 1 in this embodiment, and a third gear 93 meshing with the first gear 91 is fixedly installed on the shaft of the encoder 8. In addition, in order to make the overall space occupied by the housing 1 as compact as possible, the screw 2, the driving motor 7, and the encoder 8 are arranged in sequence from top to bottom in the housing 1 in this embodiment.
[0034] The above-mentioned guideless linear drive mechanism adopts the cooperation of the screw 2 and the internal threaded channel 321 on the slider 3, so that only the two degrees of freedom of the slider 3, namely circumferential rotation and axial movement, are not restricted. On this basis, two inclined structures and a plurality of rolling bodies 42 are used to circumferentially limit the slider 3, so that the slider 3 can only have one degree of freedom, namely axial movement. Such a structural design can not only ensure that the guideless linear drive structure can operate stably and reliably, but also ensure that the overall structure of the guideless linear drive mechanism is compact.
[0035] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any other form. Any modification or equivalent change made according to the technical essence of the present invention still falls within the scope of protection required by the present invention.
[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "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, an indirect connection through an intermediate medium, or 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.
Claims
1. A guide rail-free linear drive mechanism, comprising: The box body is characterized in that: the screw rod is supported and arranged in the box body in the front-back horizontal direction through the bearing group, and the slider with the internal thread channel is screwed on the screw rod through the internal thread channel; the top of the slider is composed of a connecting part protruding upward in the middle part and inclined planes arranged on the left and right sides of the connecting part, and a long installation groove is opened inward on each inclined plane, and a supporting plate is placed in each long installation groove, and a plurality of rolling body supporting holes are opened on the supporting plate, and each rolling body supporting hole is arranged in a straight line from front to back, and a rolling body is placed in each rolling body supporting hole, and the height of the rolling body in the groove depth direction of the corresponding long installation groove is greater than the groove depth of the long installation groove where the rolling body is located; The cover plate on the top of the box body is composed of a middle cover plate and inclined cover plates arranged on the left and right sides of the middle cover plate. An elongated through slot is provided on the middle cover plate, and the connecting portion on the slider extends into the elongated through slot and the top of the connecting portion protrudes out of the elongated through slot; the inclinations of the two inclined cover plates correspond to the two side inclined planes on the slider, and a gap is left between each inclined cover plate and the corresponding inclined plane on the slider; a slide plate is installed on the inner side of each inclined cover plate, and the two slide plates are in contact with each rolling body in the elongated mounting slot on the corresponding side, and each rolling body rolls in contact with the corresponding slide plate during the movement of the slider in the front-rear direction; The box body is provided with a driving mechanism for driving the screw rod to rotate forward or reversely around its own axis, thereby causing the slide block to move horizontally from front to back or from back to front.
2. A guide rail-less linear drive mechanism according to claim 1, characterized in that: The driving mechanism comprises: a driving motor is fixedly installed in the box body, a first gear is fixedly installed on the motor shaft of the driving motor, and a second gear meshing with the first gear is fixedly installed on the screw rod.
3. The guide rail-less linear drive mechanism according to claim 2, characterized in that: An encoder is fixedly installed in the box, and a third gear meshing with the first gear is fixedly installed on the shaft of the encoder; the screw, the drive motor and the encoder are arranged in sequence from top to bottom in the box.
4. The guide rail-less linear drive mechanism according to claim 1, characterized in that: A pressure regulating mechanism is arranged between each inclined cover plate and the corresponding slide plate, which enables the slide plate to contact the rolling bodies in the corresponding elongated installation groove at a certain set pressure.
5. The guide rail-less linear drive mechanism according to claim 4, characterized in that: The pressure regulating mechanism is as follows: a long embedding groove is opened inwardly on the inner side wall of the inclined cover plate, the slide plate is embedded in the long embedding groove, and a plurality of threaded through holes are opened on the outer side wall of the inclined cover plate, each threaded through hole passes through the bottom of the long embedding groove, and each threaded through hole is arranged in a straight line from front to back, a screw is screwed into each threaded through hole, and the bottom of each screw is against the slide plate.
6. A guide rail-less linear drive mechanism according to claim 1, 4 or 5, characterized in that: The rolling body is a ball, and the rolling body support hole is a circular support through hole capable of accommodating the ball.
7. A guide rail-less linear drive mechanism according to claim 1, 4 or 5, characterized in that: The inclined planes arranged on the left and right sides of the connecting portion are symmetrically distributed with respect to the vertical center plane of the connecting portion, and any inclined plane forms an angle of 45° with the vertical center plane of the connecting portion.
8. The guide rail-less linear drive mechanism according to claim 1, characterized in that: The slider with the internal thread channel is composed of an inner sleeve and an outer slider. A through hole is provided on the outer slider for the inner sleeve to be embedded. The inner sleeve is fixedly connected to the outer slider by a plurality of fastening screws. The inner wall of the inner sleeve is an internal thread channel matching the external thread section on the screw.
9. A guide rail-less linear drive mechanism according to claim 1 or 8, characterized in that: A first limiting shaft ring and a second limiting shaft ring are arranged on the screw rod, and the sliding block is located on the screw rod between the first limiting shaft ring and the second limiting shaft ring.