Double-station rotary positioning device

Abstract

The invention belongs to the technical field of machining and automatic production, and particularly relates to a double-station rotary positioning device. Comprising a rotating mechanism, a positioning mechanism and two sets of tool clamps, the rotating mechanism comprises a rotating disc and a driving assembly used for driving the rotating disc to rotate, and the two sets of tool clamps are both arranged on the upper surface of the rotating disc and are symmetrically arranged about the center of the rotating disc; the tool clamp is used for fixing a workpiece model, and the positioning mechanism is arranged below the rotating disc and used for clamping and positioning the rotating mechanism. By arranging the positioning mechanism, the turntable can be accurately positioned, so that the reliability of the machining process is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing and automated production, and in particular relates to a double-station rotary positioning device. Background Art

[0002] In the field of mechanical processing and automated production, rotating mechanisms and fixtures are important components for achieving efficient and precise processing. The existing rotating mechanism drives the rack to move through the cylinder, thereby driving the gear meshing with the rack and the turntable fixedly connected to the gear to move. However, the positioning accuracy of the cylinder is not high enough, which easily leads to inaccurate positioning accuracy of the turntable, thus affecting the processing quality of the workpiece.

[0003] Therefore, there is an urgent need to design a double-station rotary positioning device that can improve the positioning accuracy of the rotating mechanism. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, the present invention provides a double-station rotary positioning device, and specifically discloses the following technical solutions:

[0005] A double-station rotary positioning device includes a rotating mechanism, a positioning mechanism and a tooling fixture, wherein the rotating mechanism includes a turntable and a driving assembly for driving the turntable to rotate, the tooling fixture is provided in two groups, and the two groups of tooling fixtures are both arranged on the upper surface of the turntable and symmetrically arranged about the center of the turntable, the tooling fixture is used to fix a workpiece model, and the positioning mechanism is arranged below the turntable for clamping and positioning the rotating mechanism.

[0006] Furthermore, the tooling fixture includes a fixture base plate, which is fixedly mounted on the top of the turntable through a number of support columns at the bottom end, and the top of the turntable is located around the fixture base plate and a rotating downward pressure cylinder is fixedly mounted thereon, and a downward pressure plate is mounted on the top of the rotating downward pressure cylinder for clamping and fixing the workpiece model placed on the fixture base plate, a workpiece model placement station is arranged at the center position of the upper surface of the fixture base plate, and an infrared emitting sensor is mounted at the four corners of the upper surface of the fixture base plate corresponding to the workpiece model placement station.

[0007] Furthermore, the driving assembly includes a supporting chassis, a supporting shaft is fixedly installed at the center position of the upper surface of the supporting chassis, a cylindrical gear and a positioning flange are rotatably installed on the top of the supporting shaft through a bearing, the positioning flange and the cylindrical gear are fixed to the bottom surface of the turntable from top to bottom in sequence, and the axis center line of the turntable, the axis center line of the positioning flange and the axis center line of the cylindrical gear are all located on the same straight line, a linear guide is installed on the upper surface of the supporting chassis through a guide rail mounting seat, a slider is slidably installed on the linear guide, a rack is fixedly connected to the top end of the slider, one end of the rack is fixedly connected to the output end of a linear drive cylinder, the linear drive cylinder is used to drive the rack and the slider to move along the linear guide, and the rack is meshed with the cylindrical gear.

[0008] Furthermore, an annular wear-resistant belt is fixedly installed on the lower surface of the turntable, and a cam follower is installed on each of the four edges of the top of the supporting chassis through a bracket, and the cam on the cam follower contacts the bottom surface of the wear-resistant belt.

[0009] Furthermore, the positioning mechanism includes two fixed shafts fixedly connected to the supporting chassis and respectively located on both sides of the positioning flange, the two fixed shafts are both located on one side of the rack where the teeth are set, and the top ends of the two fixed shafts are rotatably installed with levers, one end of the lever is provided with a clamping head, and the other end is provided with a strip-shaped limiting groove, and slots corresponding to the clamping heads are respectively provided on both sides of the positioning flange, and the two clamping grooves are symmetrically arranged about the center of the positioning flange, and two bosses are spaced apart at intervals along the length direction at the top end of the rack, and the two bosses are respectively used to cooperate with the strip-shaped limiting grooves on the two levers, and respectively push the two levers so that their clamping heads are engaged with the clamping grooves on the positioning flange.

[0010] Furthermore, a column is provided on the supporting chassis corresponding to each of the shifting rods, and a tension and compression spring is connected between the top end of the column and the corresponding clamping head of the shifting rod.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] In the present invention, by providing a positioning mechanism, the turntable can be accurately positioned, thereby improving the reliability of the processing process;

[0013] The cam follower and wear-resistant belt are used in the rotating mechanism to provide reliable support for the turntable, thereby improving the stability and service life of the device;

[0014] The tooling fixture uses a rotating downward pressure cylinder and an infrared transmitting sensor to achieve high-precision positioning of complex workpieces. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 It is a schematic diagram of the structure of the fixture in the present invention.

[0017] Figure 3 It is a partial structural exploded view of the rotating mechanism in the present invention.

[0018] Figure 4 It is a partial exploded view of the positioning mechanism and the rotating mechanism in the present invention.

[0019] Figure 5 It is an exploded view of the fixture in the present invention.

[0020] Figure 6 It is a schematic diagram of the structure of the supporting chassis in the present invention.

[0021] Figure 7 It is a schematic diagram of the meshing structure of the rack and the cylindrical gear in the present invention.

[0022] Figure 8 It is a schematic diagram of a matching state of the positioning flange and the positioning mechanism in the present invention.

[0023] Fig. 9 It is a schematic diagram of another matching state of the positioning flange and the positioning mechanism in the present invention.

[0024] Fig.10 It is a cross-sectional view of the present invention.

[0025] 1- fixture base plate, 2- turntable, 3- wear-resistant belt, 4- positioning flange, 5- support chassis, 6- guide rail mounting seat, 7- slider, 8- linear guide, 9- rack, 10- fixed shaft, 11- lever, 12- tension and compression spring, 13- cylindrical gear, 14- linear drive cylinder, 15- column, 16- infrared emission sensor, 17- rotary downward pressure cylinder, 18- workpiece model, 19- cam follower, 20- boss, 21- bearing, 22- support shaft. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Reference Figure 1-10A double-station rotary positioning device includes a rotating mechanism, a positioning mechanism and a fixture. The rotating mechanism includes a turntable 2 and a driving assembly for driving the turntable 2 to rotate. Two groups of fixtures are provided. Both groups of fixtures are arranged on the upper surface of the turntable 2 and are symmetrically arranged about the center of the turntable 2. The fixture is used to fix the workpiece model 18. The positioning mechanism is arranged below the turntable 2 and is used to clamp and position the rotating mechanism.

[0028] In this embodiment, the tooling fixture includes a fixture base plate 1, which is fixedly installed on the top of a turntable 2 through a number of support columns at the bottom end. The top of the turntable 2 is located around the fixture base plate 1 and a rotating downward pressure cylinder 17 is fixedly installed. A downward pressure plate is installed on the top of the rotating downward pressure cylinder 17. The rotating downward pressure cylinder 17 can drive the downward pressure plate to complete the rotation and lifting action, so as to realize the compression and fixation of the workpiece model 18 placed on the fixture base plate 1. A workpiece model placement station is set at the center position of the upper surface of the fixture base plate 1, and an infrared emitting sensor 16 is respectively installed at the four corners of the upper surface of the fixture base plate 1 corresponding to the workpiece model placement station.

[0029] In this embodiment, the driving assembly includes a supporting chassis 5, a supporting shaft 22 is fixedly installed at the center position of the upper surface of the supporting chassis 5, a cylindrical gear 13 and a positioning flange 4 are rotatably installed on the top of the supporting shaft 22 through a bearing 21, the cylindrical gear 13 and the positioning flange 4 are fixedly connected to the outer ring of the bearing 21, the supporting shaft 22 is fixedly connected to the inner ring of the bearing 21, the positioning flange 4 and the cylindrical gear 13 are fixed on the bottom surface of the turntable 2 from top to bottom, so that they are connected as a whole, and the axis center line of the turntable 2, the axis center line of the positioning flange 4 and the cylindrical gear 13 are fixedly connected to the bottom surface of the turntable 2 from top to bottom, so that they are connected as a whole, and the axis center line of the turntable 2, the axis center line of the positioning flange 4 and the cylindrical gear 13 are fixedly connected to the bottom surface of the turntable 2 from top to bottom, and the cylindrical gear 13 is ... The axis lines of the gears 13 are all located on the same straight line. A linear guide 8 is installed on the upper surface of the supporting chassis 5 through a guide rail mounting seat 6. A slider 7 is slidably installed on the linear guide 8. A rack 9 is fixedly connected to the top of the slider 7. One end of the rack 9 is fixedly connected to the output end of the linear drive cylinder 14. The linear drive cylinder 14 is used to drive the rack 9 and the slider 7 to move along the linear guide 8. The rack 9 is meshed with the cylindrical gear 13. During the movement of the rack 9 along the linear guide 8, the cylindrical gear 13 can be driven to rotate, thereby driving the turntable 2 to rotate.

[0030] In this embodiment, an annular wear-resistant belt 3 is fixedly installed on the lower surface of the turntable 2, and a cam follower 19 is installed on the four edges of the top of the supporting chassis 5 through a bracket. The cam on the cam follower 19 is in contact with the bottom surface of the wear-resistant belt 3. The four cam followers 19 can reliably support the periphery of the turntable 2, thereby improving the stability of the turntable 2. By providing the wear-resistant belt 3, the wear of the turntable 2 by the cam follower 19 can be effectively avoided, thereby increasing the service life of the device.

[0031] In this embodiment, the positioning mechanism includes two fixed shafts 10 fixedly connected to the supporting chassis 5 and respectively located on both sides of the positioning flange 4. The two fixed shafts 10 are both located on the side where the teeth of the rack 9 are set. The top ends of the two fixed shafts 10 are rotatably mounted with levers 11. The middle part of the lever 11 is rotatably connected to the fixed shaft 10. A clamping head is set at one end of the lever 11, and a strip-shaped limiting groove is set at the other end. Slots corresponding to the clamping heads are respectively provided on both sides of the positioning flange 4. The two clamping grooves are symmetrically arranged about the center of the positioning flange 4. Two bosses 20 are spaced apart at the top end of the rack 9 along the length direction. The two bosses 20 are respectively used to cooperate with the strip-shaped limiting grooves on the two levers 11, and respectively push the two levers 11 to make their clamping heads engage with the clamping grooves on the positioning flange 4. Figure 8 As shown, when the linear drive cylinder 14 is in the extended state, when the turntable 2 rotates 180°, the left protrusion 20 on the rack 9 pushes the left lever 11 to move, so that the clamping head of the left lever 11 is clamped into the clamping groove of the positioning flange 4, thereby realizing the accurate positioning of the turntable 2. Fig. 9 When the linear drive cylinder 14 is in the retracted state, the right boss 20 on the rack 9 pushes the right lever 11 to move, so that the clamping head of the right lever 11 is clamped into the clamping groove of the positioning flange 4, thereby realizing the accurate positioning of the turntable 2.

[0032] In this embodiment, a column 15 is provided on the supporting chassis 5 corresponding to each lever 11, and a tension-compression spring 12 is connected between the top of the column 15 and the clamping head of the corresponding lever 11. The setting of the tension-compression spring 12 can ensure that the lever 11 can be maintained in an appropriate position when it does not contact the boss 20, thereby avoiding its rotation angle being too large and causing mismatch with the boss 20.

[0033] The working principle of the present invention is:

[0034] Initial state: the turntable 2 is in the initial position, at which the clamping head of the right lever 11 is tightly fitted with the clamping groove of the positioning flange 4, so that the turntable 2 is accurately positioned and fixed in the initial position. The rotary pressing cylinder 17 of the fixture is in a standby state, and the infrared emission sensor 16 is ready to detect the position of the screw hole.

[0035] Rotation process of turntable 2 (linear drive cylinder 14 is in extended state): linear drive cylinder 14 extends, pushing rack 9 to move along linear guide rail 8, rack 9 meshes with cylindrical gear 13 for transmission, driving bearing 21 to rotate, and then driving turntable 2 to start rotating; during the rotation process of turntable 2, four cam followers 19 evenly support turntable 2, and wear-resistant belt 3 reduces friction to ensure smooth operation of turntable 2. When turntable 2 rotates 180° to the working position, the left convex column 20 on rack 9 pushes the left lever 11 to rotate, so that the clamping head of the left lever 11 fits tightly with the clamping groove of positioning flange 4, realizing accurate positioning of turntable 2 and fixing it in the working position. At this time, tension and compression spring 12 provides elastic support to ensure that the clamping head of lever 11 fits more tightly with the clamping groove of positioning flange 4, further improving positioning accuracy and reliability.

[0036] Working process of the fixture: After the turntable 2 reaches the working position, the fixture starts working. The four rotating downward pressure cylinders 17 are started to apply pressure to the workpiece model 18 from different directions to firmly fix it on the fixture base plate 1. The four infrared emission sensors 16 locate the screw hole positions and compare and verify their position information with the position of the tightening device at the end of the robot to confirm whether the robot is in the correct working position.

[0037] Return to the initial position (linear drive cylinder 14 retracted): After the processing is completed, the linear drive cylinder 14 retracts, the rack 9 moves in the opposite direction, and drives the turntable 2 to rotate in the opposite direction. When the turntable 2 rotates 180° back to the initial position, the right side boss 20 on the rack 9 pushes the right side lever 11, so that the clamping head of the right side lever 11 is clamped into the clamping groove of the positioning flange 4, so as to achieve accurate positioning of the turntable 2 and fix it in the initial position. At this time, the tension and compression spring 12 also provides elastic support to ensure that the clamping head of the right side lever 11 fits more closely with the clamping groove on the positioning flange 4, further improving the positioning accuracy and reliability.

[0038] Repeat work: Turntable 2 waits for the next workpiece at the initial position and repeats the above work process to achieve efficient positioning and processing of the double stations.

[0039] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A double-station rotary positioning device, characterized in that: It includes a rotating mechanism, a positioning mechanism and a tooling fixture. The rotating mechanism includes a turntable and a driving component for driving the turntable to rotate. The tooling fixture is provided in two groups. The two groups of tooling fixtures are both arranged on the upper surface of the turntable and are symmetrically arranged about the center of the turntable. The tooling fixture is used to fix the workpiece model. The positioning mechanism is arranged below the turntable and is used to clamp and position the rotating mechanism.

2. A double-station rotary positioning device according to claim 1, characterized in that: The tooling fixture includes a fixture base plate, which is fixedly mounted on the top of the turntable through a number of support columns at the bottom end; the top of the turntable is located around the fixture base plate and a rotating downward pressure cylinder is fixedly mounted thereon; a downward pressure plate is mounted on the top of the rotating downward pressure cylinder for clamping and fixing the workpiece model placed on the fixture base plate; a workpiece model placement station is arranged at the center of the upper surface of the fixture base plate, and an infrared emitting sensor is mounted at the four corners of the upper surface of the fixture base plate corresponding to the workpiece model placement station.

3. A double-station rotary positioning device according to claim 1, characterized in that: The driving assembly includes a supporting chassis, a supporting shaft is fixedly installed at the center position of the upper surface of the supporting chassis, a cylindrical gear and a positioning flange are rotatably installed on the top of the supporting shaft through a bearing, the positioning flange and the cylindrical gear are fixed to the bottom surface of the turntable from top to bottom in sequence, and the axis center line of the turntable, the axis center line of the positioning flange and the axis center line of the cylindrical gear are all located on the same straight line, a linear guide is installed on the upper surface of the supporting chassis through a guide rail mounting seat, a slider is slidably installed on the linear guide rail, a rack is fixedly connected to the top end of the slider, one end of the rack is fixedly connected to the output end of a linear drive cylinder, the linear drive cylinder is used to drive the rack and the slider to move along the linear guide rail, and the rack is meshed with the cylindrical gear.

4. A double-station rotary positioning device according to claim 3, characterized in that: An annular wear-resistant belt is fixedly mounted on the lower surface of the turntable, and a cam follower is respectively mounted on the four edges of the top of the supporting chassis through a bracket, and the cam on the cam follower contacts the bottom surface of the wear-resistant belt.

5. A double-station rotary positioning device according to claim 3, characterized in that: The positioning mechanism includes two fixed shafts fixedly connected to the supporting chassis and respectively located on both sides of the positioning flange, the two fixed shafts are located on one side of the rack where the teeth are set, and the top ends of the two fixed shafts are rotatably installed with levers, one end of the lever is provided with a clamping head, and the other end is provided with a strip-shaped limiting groove, and slots corresponding to the clamping heads are respectively provided on both sides of the positioning flange, and the two clamping grooves are symmetrically arranged about the center of the positioning flange, and two bosses are spaced apart at intervals along the length direction at the top end of the rack, and the two bosses are respectively used to cooperate with the strip-shaped limiting grooves on the two levers, and respectively push the two levers to make their clamping heads engage with the clamping grooves on the positioning flange.

6. A double-station rotary positioning device according to claim 5, characterized in that: A column is arranged on the supporting chassis corresponding to each of the shifting rods, and a tension and compression spring is connected between the top of the column and the corresponding clamping head of the shifting rod.

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