An automatic positioning and guiding device and method for special-shaped strip materials

Abstract

The present invention relates to a device and method for automatically positioning and guiding special-shaped bars, specifically including a base disc, two connecting turntables, an open thick-walled cylinder, a top cover disc, an arc-shaped stopper, rolling bearings, bearing seats, connecting nuts, threaded rods, drive motors, pin shafts, special-shaped bars, stress sensors, and couplings. The present invention is provided with symmetric rolling bearings, which can accurately position objects and appropriately adjust the number of rolling bearings according to the cross-sectional shape of the special-shaped bar to meet its accurate centering requirements; at the same time, stress sensors are set to accurately monitor the magnitude of the clamping force and avoid deformation of hollow thin-walled special-shaped bars caused by excessive clamping force; in addition, during the bar guiding process of the present invention, rolling is used instead of sliding, effectively avoiding the problem of scratches on the bar surface, and having the characteristics of simple operation, strong versatility, and flexible control.

Description

Technical Field

[0001] The present invention belongs to the technical field of special-shaped bar processing, and particularly relates to an automatic positioning and guiding device and method for special-shaped bars. Background Art

[0002] With the rapid development of China's electronics industry, the demand for high-precision special-shaped bars is increasing. To ensure the processing accuracy of special-shaped bars, a high-precision positioning and guiding device is required. Through a high-precision positioning and guiding device, centering, clamping, and guiding of special-shaped bars can be achieved, preventing the surface of the bars from being scratched during the feeding process, affecting the surface quality, and being crucial for subsequent process processing.

[0003] Currently, in the design of clamping and guiding devices, triangular chucks and roller racks are commonly used in China. The triangular chuck requires manual clamping, which has the disadvantages of cumbersome clamping, time-consuming, and difficult to accurately grasp the clamping force, and the surface quality of the processed workpieces cannot be guaranteed. The roller rack is mainly used for the positioning and guiding of cylindrical and cylindrical parts. For special-shaped bar workpieces, it is difficult to accurately center and guide them. For example, for a rectangular cross-section thin-walled hollow bar, due to inconsistent forces on each side, deformation will occur at the position where the force is larger, seriously affecting the product accuracy. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the above-mentioned deficiencies of the prior art, and provide an automatic positioning and guiding device and method for special-shaped bars. Through the rotational cooperation relationship between the driving motor and the threaded rod and the rolling bearing, the positioning and clamping of special-shaped bars can be achieved; by monitoring the magnitude of the clamping force through the stress sensor, the problem of deformation of thin-walled bars due to excessive clamping force can be effectively avoided; through the rolling of the rolling bearing, the rolling feed of special-shaped bars can be achieved, avoiding the scratching of the bar surface caused by the sliding feed of special-shaped bars; two driving motors are provided, which can position and guide bars with irregular cross-sections, are stable and reliable, and are convenient to operate.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a special-shaped bar automatic positioning and guiding device and method, including an open thick-walled cylinder, two connecting turntables, a base disk, an arc-shaped stopper, a connecting nut, a top cover disk, a threaded rod, a special-shaped bar, a rolling bearing, a bearing seat, a pin shaft, a pin, a pressure sensor, a driving motor, and a coupling; the output shaft of the driving motor is connected to the threaded rod through the coupling, the threaded rod is threadedly connected to the connecting nut, and the connecting turntable is connected to the connecting nut through a pin and forms a rotating pair; the connecting turntable is provided with two guiding grooves, the pin shaft penetrates through the bearing seat and the upper and lower ends are clamped in the guiding grooves, the rolling bearing is installed in the bearing seat and is circumferentially distributed in the open thick-walled cylinder; the arc-shaped stopper is fixed between the base disk and the top cover disk along the Y-axis by a first screw; the open thick-walled cylinder is connected to the arc-shaped stopper through a second screw, and four windows are evenly opened on the side wall of the open thick-walled cylinder; the two connecting turntables are respectively located at the upper and lower ends of the open thick-walled cylinder, and the movement of the connecting turntable along the Y-axis direction is restricted by the base disk, the open thick-walled cylinder and the top cover disk, and the movement of the connecting turntable along the X-axis and Z-axis directions is restricted by the arc-shaped stopper, and only the freedom of the connecting turntable to rotate around the axis direction of the connecting turntable is retained; the base disk, the connecting turntable, the open thick-walled cylinder, and the top cover disk are coaxial.

[0006] Further: when the driving motor starts, it drives the threaded rod to rotate, and drives the connecting nut to move along the axis direction of the threaded rod through the threaded cooperation between the threaded rod and the connecting nut; the connecting nut drives the connecting turntable to rotate around the axis of the connecting turntable; when the connecting turntable rotates, it drives the bearing seat and the rolling bearing to move in the window through the pin shaft; the pressure sensor measures the clamping force of the rolling bearing clamping the special-shaped bar, and when the pressure reaches the set value, the driving motor stops rotating.

[0007] Further: it is possible to position and guide special-shaped bars with unequal numbers of cross-sectional sides, and the two connecting turntables can control the four rolling bearings to achieve the positioning and guiding of special-shaped bars with the number of sides S:

[0008] S = 4n (n = 1, 2,...)

[0009] Further: when the size of the special-shaped bar changes, the clamping and loosening of the special-shaped bar can be realized by controlling the number of rotation turns N of the driving motor, and the number of rotation turns N can be determined by the following formula:

[0010]

[0011] In the formula, β is the angle between the guiding groove and the handle of the connecting turntable, a is the length of the long side of the cross-section of the special-shaped bar, and R is the distance from the pin shaft in the guiding groove to the axis of the connecting turntable at the initial position, R Lis the distance between the pin and the axis of the connecting turntable, and P is the pitch of the threaded rod.

[0012] Further: The length a of the long side of the cross-section of the special-shaped bar that can pass through can be determined by the radius r of the central hole of the base disc and the width of the rolling bearing. The formula is as follows:

[0013] The maximum-sized special-shaped bar that can pass through satisfies

[0014]

[0015] The minimum-sized special-shaped bar that can pass through satisfies

[0016] a = l

[0017] In the formula, a is the length of the cross-section of the special-shaped bar, b is the width of the cross-section of the special-shaped bar, l is the width of the rolling bearing, and r is the radius of the central hole of the base disc.

[0018] Further: It includes the following steps.

[0019] S1. Judge whether the length a of the long side of the cross-section of the special-shaped bar is between l and 2r. If it is, the processing condition is satisfied.

[0020] S2. Determine the number of turns of the threaded rod according to the formula, and start the drive motor to drive the rolling bearing to rotate outwards.

[0021] S3. Manually guide the special-shaped bar through this device.

[0022] S4. The drive motor drives the connecting turntable to rotate, and the connecting turntable controls the rolling bearing to clamp the material. When the clamping force reaches the predetermined value, the drive motor is controlled to stop rotating through the force feedback loop.

[0023] S5. Perform the next process treatment.

[0024] The beneficial effects of the present invention are that the present invention is provided with symmetrical rolling bearings, which can accurately position the object and can appropriately adjust the number of rolling bearings according to the cross-sectional shape of the special-shaped bar to meet its accurate centering, and the centering accuracy is high. At the same time, a stress sensor is set, which can accurately monitor the magnitude of the clamping force and avoid the deformation of the hollow thin-walled special-shaped bar caused by excessive clamping force. The roller bearing uses rolling instead of sliding during the guiding process of the special-shaped bar, effectively avoiding the problem of scratches on the surface of the bar, and has the characteristics of simple operation, strong versatility, and flexible control. Description of the Drawings

[0025] The present invention will be further described below with reference to the drawings and embodiments.

[0026] Figure 1 is the schematic diagram of the external structure of the present invention;

[0027] Figure 2 This is a cross-sectional view of the present invention;

[0028] Figure 3 This is a schematic diagram of the internal structure of the present invention;

[0029] Figure 4 This is a connection diagram of the connecting turntable connected to the bearing seat through a pin shaft;

[0030] Figure 5 This is a schematic diagram for solving the number of turns of the screw rotation;

[0031] Figure 6 This is a schematic diagram for selecting the cross-sectional dimension of the strip material.

[0032] In the figure, 101 are the screws connecting the top cover disc and the base disc, and 102 are the screws connecting the thick-walled cylinder; 2 is the open thick-walled cylinder, 3 is the connecting turntable (301 is the guiding groove of the connecting turntable, 302 is the handle of the connecting turntable); 4 is the base disc; 5 is the arc-shaped stopper; 6 is the connecting nut; 7 is the top cover disc; 8 is the threaded rod; 9 is the special-shaped strip material; 10 is the rolling bearing; 11 is the bearing seat; 12 is the pin shaft; 13 is the pin; 14 is the pressure sensor; 15 is the driving motor; 16 is the coupling. Detailed Embodiment

[0033] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention. On the contrary, the embodiments of the present invention include all changes, modifications and equivalents falling within the spirit and scope of the appended claims.

[0034] In the description of the present 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", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, 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 operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0035] In addition, terms such as "first", "second", etc. are for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "connected to" 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 mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise stated, the meaning of "a plurality of" is two or more than two.

[0036] Any process or method description shown in a flowchart or described in other ways herein can be understood to represent a module, segment, or part of code including one or more executable instructions for implementing a specific logical function or process. The scope of the preferred embodiments of the present invention includes additional implementations, where the functions can be executed in a substantially simultaneous manner or in a reverse order according to the functions involved, rather than in the order shown or discussed, which should be understood by those skilled in the art to which the embodiments of the present invention pertain.

[0037] As Figures 1 to 4 As shown, the present invention provides a device and method for automatically positioning and guiding a special-shaped strip, including an open thick-walled cylinder 2, two connecting turntables 3, a base disc 4, an arc-shaped block 5, a connecting nut 6, a top cover disc 7, a threaded rod 8, a special-shaped strip 9, a rolling bearing 10, a bearing seat 11, a pin shaft 12, a pin 13, a pressure sensor 14, a driving motor 15, and a coupling 16; the output shaft of the driving motor 15 is connected to the threaded rod 8 through the coupling 16, the threaded rod 8 is threadedly connected to the connecting nut 6, and the connecting turntable 3 is connected to the connecting nut 6 through the pin 13 to form a rotating pair; the connecting turntable 3 is provided with two guiding grooves 301, the pin shaft 12 passes through the bearing seat 11 and the upper and lower ends are clamped in the guiding grooves 301, the rolling bearing 10 is installed in the bearing seat 11 and is circumferentially distributed in the open thick-walled cylinder 2; the arc-shaped block 5 is fixed between the base disc 4 and the top cover disc 7 along the Y-axis by a first screw 101; the open thick-walled cylinder 2 is connected to the arc-shaped block 5 through a second screw 102, and four windows are evenly opened on the side wall of the open thick-walled cylinder 2; the two connecting turntables 3 are respectively located at the upper and lower ends of the open thick-walled cylinder 2, and the movement of the connecting turntable 3 along the Y-axis direction is restricted by the base disc 4, the open thick-walled cylinder 2 and the top cover disc 7, and the movement of the connecting turntable 3 along the X-axis and Z-axis directions is restricted by the arc-shaped block 5, and only the freedom of rotation of the connecting turntable 3 around the axis direction of the connecting turntable 3 is retained; the base disc 4, the connecting turntable 3, the open thick-walled cylinder 2, and the top cover disc 7 are coaxial.

[0038] The driving motor 15 starts, drives the threaded rod 8 to rotate, and drives the connecting nut 6 to move along the axis direction of the threaded rod 8 through the thread fit between the threaded rod 8 and the connecting nut 6; the connecting nut 6 drives the connecting turntable 3 to rotate around the axis of the connecting turntable 3; the connecting turntable 3 rotates, and drives the bearing seat 11 and the rolling bearing 10 to move in the window through the pin shaft 12; the pressure sensor 14 measures the clamping force of the rolling bearing 10 clamping the special-shaped strip 9, and when the pressure reaches the set value, the driving motor 15 stops rotating.

[0039] By setting the symmetric roller bearings 10, the special-shaped strip 9 is changed from the original sliding friction to rolling friction when passing through the device, which greatly reduces the frictional force and reduces the possibility of the special-shaped strip 9 being scratched during the feeding process. The driving motor 15 drives the threaded rod 8 to rotate, and then drives the connecting turntable 3 to rotate. When the connecting turntable 3 rotates, it will control the rolling bearing 10 to clamp the material. When the clamping force of the rolling bearing 10 clamping the special-shaped strip 9 reaches the preset value, the driving motor 15 is controlled to stop rotating through the feedback loop, so as to achieve the appropriate force for the device to clamp the special-shaped strip 9, and will not cause the special-shaped strip 9 to be deformed due to excessive clamping force, ensuring the processing quality of the subsequent special-shaped strip 9. In addition, through the two driving motors 15, the special-shaped strip 9 with an irregular cross-section can be positioned and guided, which is more stable and reliable.

[0040] The special-shaped strip 9 with unequal number of sides of the cross-section can be positioned and guided. The two connecting turntables 3 can control the four rolling bearings 10 to realize the positioning and guiding of the special-shaped strip 9 with the number of sides S:

[0041] S = 4n (n = 1, 2,...)

[0042] The four rolling bearings 10 clamp the special-shaped strip 9, give the special-shaped strip 9 guidance and positioning, so that the sliding friction is converted into rolling friction during the process of clamping the special-shaped strip 9, greatly reducing the risk of surface scratching of the special-shaped strip 9. At the same time, by clamping the special-shaped strip 9 with the four rolling bearings 10 at the same time, the special-shaped strip 9 is uniformly stressed and will not cause the deformation of the special-shaped strip 9.

[0043] As Figure 5 shown, when the size of the special-shaped strip 9 changes, the clamping and relaxation of the special-shaped strip can be realized by controlling the number of rotation turns N of the driving motor 15. The number of rotation turns N can be determined by the following formula (1):

[0044]

[0045] Where β is the angle between the guiding groove 301 and the connecting turntable handle 302, a is the length of the long side of the cross-section of the special-shaped bar 9, R is the distance from the pin shaft 12 in the guiding groove 301 to the axis of the connecting turntable 3 at the initial position, and R L is the distance between the pin 13 and the axis of the connecting turntable 3, and P is the pitch of the threaded rod 8.

[0046] As Figure 6 shown, the length a of the long side of the cross-section of the special-shaped bar 9 that can pass through can be determined by the radius r of the central hole of the base disk 4 and the width of the rolling bearing 10. The formula (2) is as follows:

[0047] The maximum-sized special-shaped bar 9 that can pass through satisfies

[0048]

[0049] The minimum-sized special-shaped bar 9 that can pass through satisfies

[0050] a = l

[0051] Where a is the length of the cross-section of the special-shaped bar 9, b is the width of the cross-section of the special-shaped bar 9, l is the width of the rolling bearing 10, and r is the radius of the central hole of the base disk 4.

[0052] It includes the following steps: S1. Judge whether the length a of the long side of the cross-section of the special-shaped bar 9 is between l and 2r. If it is, the processing condition is satisfied; S2. Determine the number of turns of the threaded rod 8 according to Formula 1, and start the driving motor 15 to drive the rolling bearing 10 to rotate outwards; S3. Manually guide the special-shaped bar 9 to pass through this device; S4. The driving motor 15 drives the connecting turntable 3 to rotate, and the connecting turntable 3 controls the rolling bearing 10 to clamp the material. When the clamping force reaches the predetermined value, control the driving motor 15 to stop rotating through the force feedback loop; S5. Perform the next process treatment.

[0053] First, judge the length of the long side of the cross-section of the special-shaped bar 9 to see whether the special-shaped bar 9 can meet the processing requirements of this device. Then, judge the number of turns of the threaded rod 8 according to Formula 1. Then, start the driving motor 15 to drive the connecting turntable 3 to drive the rolling bearing 10 to move radially, so as to open this device. Manually pass the special-shaped bar 9 through this device. The driving motor 15 drives the connecting turntable 3 to rotate, and the rolling bearing 10 clamps the material. When the clamping force reaches the preset value, the driving motor 15 stops rotating, and the next processing of the special-shaped bar 9 is carried out.

[0054] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0055] Enlightened by the above ideal embodiments according to the present invention, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An automatic positioning and guiding device for special-shaped bars, characterized in that: It includes an open thick-walled cylinder (2), two connecting turntables (3), a base disc (4), an arc-shaped stop block (5), a connecting nut (6), a top cover disc (7), a threaded rod (8), a special-shaped strip (9), a rolling bearing (10), a bearing seat (11), a pin shaft (12), a pin (13), a pressure sensor (14), a driving motor (15), and a coupling (16); the output shaft of the driving motor (15) is connected to the threaded rod (8) through the coupling (16), the threaded rod (8) is threadedly connected to the connecting nut (6), and the connecting turntable (3) is connected to the connecting nut (6) through the pin (13) to form a rotating pair; The connecting turntable (3) is provided with two guide grooves (301), the pin shaft (12) penetrates through the bearing seat (11) and the upper and lower ends are clamped in the guide grooves (301), and the rolling bearing (10) is installed in the bearing seat (11) and is circumferentially distributed uniformly inside the open thick-walled cylinder (2); The arc-shaped stop block (5) is fixed between the base disc (4) and the top cover disc (7) along the Y-axis by the first screw (101); the open thick-walled cylinder (2) is connected to the arc-shaped stop block (5) by the second screw (102), and four windows are evenly opened on the side wall of the open thick-walled cylinder (2); The two connecting turntables (3) are respectively located at the upper and lower ends of the open thick-walled cylinder (2), and the movement of the connecting turntable (3) along the Y-axis direction is restricted by the base disc (4), the open thick-walled cylinder (2) and the top cover disc (7), and the movement of the connecting turntable (3) along the X-axis and Z-axis directions is restricted by the arc-shaped stop block (5), and only the freedom of rotation of the connecting turntable (3) around the axis direction of the connecting turntable (3) is reserved; the base disc (4), the connecting turntable (3), the open thick-walled cylinder (2), and the top cover disc (7) are coaxial.

2. The automatic positioning and guiding device for a special-shaped strip according to claim 1, characterized in that: When the driving motor (15) starts, it drives the threaded rod (8) to rotate, and drives the connecting nut (6) to move along the axis direction of the threaded rod (8) through the threaded fit between the threaded rod (8) and the connecting nut (6); the connecting nut (6) drives the connecting turntable (3) to rotate around the axis of the connecting turntable (3); when the connecting turntable (3) rotates, it drives the bearing seat (11) and the rolling bearing (10) to move in the window through the pin shaft (12); the pressure sensor (14) measures the clamping force of the rolling bearing (10) clamping the special-shaped strip (9), and when the pressure reaches the set value, the driving motor (15) stops rotating.

3. An automatic positioning and guiding device for special-shaped bars according to claim 1, characterized in that: It can position and guide the special-shaped strip (9) with unequal number of cross-sectional sides, and the two connecting turntables (3) can control the four rolling bearings (10) to realize the positioning and guiding of the special-shaped strip (9) with the number of sides S: S = 4n (n = 1, 2,...).

4. The automatic positioning and guiding device for a special-shaped strip according to claim 1, characterized in that: When the size of the special-shaped strip (9) changes, the clamping and relaxation of the special-shaped strip can be realized by controlling the number of rotation turns N of the driving motor (15), and the number of rotation turns N can be determined by the following formula (1): Where β is the angle between the guiding groove (301) and the connecting turntable handle (302), a is the length of the long side of the cross-section of the special-shaped bar (9), R is the distance from the pin shaft (12) in the guiding groove (301) to the axis of the connecting turntable (3) at the initial position, R L is the distance between the pin (13) and the axis of the connecting turntable (3), and P is the pitch of the threaded rod (8).

5. An automatic positioning and guiding device for special-shaped strips according to claim 1, characterized in that: The length a of the long side of the cross-section of the special-shaped strip (9) that can pass through can be determined by the radius r of the central hole of the base disk (4) and the width of the rolling bearing (10). The formula (2) is as follows: The special-shaped strip (9) with the maximum size that can pass through satisfies The special-shaped strip (9) with the minimum size that can pass through satisfies a＝l In the formula, a is the length of the cross-section of the special-shaped strip (9), b is the width of the cross-section of the special-shaped strip (9), l is the width of the rolling bearing (10), and r is the radius of the central hole of the base disk (4).

6. A method for automatically positioning and guiding a special-shaped strip material, using the special-shaped strip material automatic positioning and guiding device described in claim 4 or 5, characterized in that: It includes the following steps S1. Determine whether the length a of the long side of the cross-section of the special-shaped strip (9) is between l and 2r. If it is, the processing condition is satisfied; S2. Determine the number of turns of rotation of the threaded rod (8) according to formula (1), and start the drive motor (15) to drive the rolling bearing (10) to rotate outwards; S3. Manually guide the special-shaped strip (9) to pass through this device; S4. The drive motor (15) drives the connecting turntable (3) to rotate, and the connecting turntable (3) controls the rolling bearing (10) to clamp the material. When the clamping force reaches a predetermined value, the drive motor (15) is controlled to stop rotating through the force feedback loop; S5. Perform the next process treatment.

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