Quick positioning tool clamp for concentric circles

Abstract

The invention discloses a concentric circle rapid positioning tool clamp, and belongs to the field of tool clamps, the concentric circle rapid positioning tool clamp comprises a fixing frame arranged in a cross shape, the fixing frame is provided with four positioning columns located at the tail ends of the fixing frame in the direction, and the four positioning columns are connected through a driving mechanism arranged in the fixing frame; the positioning columns are provided with movable columns coaxially arranged with the positioning columns, the rear side face of the fixed frame is provided with an installation assembly used for connecting and positioning the clamp and the rotary table, and when any positioning column is moved, the other three positioning columns can synchronously contract or expand through a driving mechanism. According to the concentric circle rapid positioning tool clamp, when any one positioning column moves, the other three positioning columns can be driven to move synchronously, so that it is ensured that the four positioning columns keep accurate relative positions in the space, error accumulation caused by movement of a single positioning column can be greatly reduced, and therefore the positioning accuracy of the whole clamp is improved.

Description

Technical Field

[0001] The invention relates to the technical field of tooling fixtures, and in particular to a concentric circle quick positioning tooling fixture. Background Art

[0002] In the sandblasting industry, circular turntables are widely used. The rotation of the turntable can drive the workpiece to move, so that the sandblasting gun can spray evenly onto all surfaces of the workpiece. The circular workpiece to be sandblasted is placed on the turntable. In order to ensure that the sandblasting gun can spray evenly on the workpiece, the workpiece needs to be concentric with the turntable, thereby avoiding the problem of uneven spraying due to the position offset of the workpiece.

[0003] The traditional way to keep a circular workpiece on a turntable concentrically fixed is to manually measure the four mutually perpendicular side lines to make sure they are consistent, then use tools to fix the workpiece to ensure that the workpiece does not move, and then proceed with the sandblasting. However, this manual measurement method requires a lot of time to find the concentricity, resulting in low efficiency. In addition, manual concentricity will introduce certain errors due to the accuracy of the measuring tool, the technical level of the measurer, and the measurement environment. This error will cause the fixed position of the workpiece on the turntable to be not completely concentric, thus affecting the uniform sandblasting of the workpiece. Summary of the invention

[0004] The purpose of the present invention is to propose a concentric circle quick positioning fixture to solve the problem that when the existing circular workpiece is fixed on a turntable for sandblasting, it is necessary to manually find the concentricity, resulting in low efficiency and errors, which affects the uniform sandblasting of the workpiece.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technology: a concentric circle quick positioning fixture, comprising a cross-shaped fixed frame, the fixed frame is provided with four positioning columns respectively located at the ends of the direction thereof, the four positioning columns are connected by a driving mechanism arranged in the fixed frame, the positioning column is provided with a movable column arranged coaxially therewith, and the rear side surface of the fixed frame is provided with a mounting assembly for connecting and positioning the fixture with a turntable;

[0006] When any one of the positioning columns is moved, the other three positioning columns can be synchronously contracted or expanded through the driving mechanism.

[0007] As a further description of the above technical solution: the driving mechanism includes a driving gear rotatably mounted on a fixed frame using a bearing, and a rack group arranged in the fixed frame and arranged in a ring shape along the driving gear, and a sliding groove is provided in the fixed frame to cooperate with the rack group to realize the movement of the rack group.

[0008] As a further description of the above technical solution: the rack group includes a pair of first transmission racks arranged longitudinally, and a pair of second transmission racks arranged transversely, the first transmission racks are hollowed out and the second transmission racks pass through the first transmission racks.

[0009] As a further description of the above technical solution: the ends of the first transmission rack and the second transmission rack are both provided with a sliding seat located in the groove through a mounting rod, the positioning column is arranged on the sliding seat, and a handle is arranged on the rear side of the sliding seat.

[0010] As a further description of the above technical solution: the driving gear is provided with a connecting shaft penetrating the bearing, and the connecting shaft is provided with an electromagnetic brake connected to the fixed frame.

[0011] As a further description of the above technical solution: the rear end of the positioning column is provided with a plug-in terminal that passes through the sliding seat, and the plug-in terminal is provided with a limit clip coaxially arranged therewith, the sliding seat is provided with a plug-in hole that matches the plug-in terminal, and the plug-in terminal is provided with a locking nut that abuts against the sliding seat through a threaded end.

[0012] As a further description of the above technical solution: a movable rod extending into the interior of the positioning column is arranged at the rear end of the movable column, a plurality of positioning screw holes are opened on the movable rod along its length direction, and a positioning bolt matching the positioning screw hole is arranged on the positioning column.

[0013] As a further description of the above technical solution: a reinforcement component is provided on a side of the positioning column and the movable column facing the axis of the fixed frame through a mounting groove;

[0014] The reinforcement component comprises a fixing sleeve located in the installation groove, a connecting end is sleeved on the fixing sleeve, a top head is arranged on the connecting end, and a spring is arranged between the connecting end and the fixing sleeve.

[0015] As a further description of the above technical solution: the installation assembly includes a mounting sleeve connected to the fixed frame, the mounting sleeve is sleeved with a mounting frame, the mounting frame is provided with a plurality of locking screw holes arranged along its length direction, and the mounting sleeve is provided with a locking bolt matching the locking screw holes.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0017] A clamping space for the circular workpiece is formed between the four positioning columns on the fixed frame. Driven by the driving mechanism, when any one positioning column moves, the other three positioning columns can be driven to move synchronously, thereby ensuring that the four positioning columns maintain precise relative positions in space, which can greatly reduce the error accumulation caused by the movement of a single positioning column, thereby improving the positioning accuracy of the entire fixture, and can ensure that the four positioning columns always maintain concentricity with the turntable during movement, thereby avoiding the workpiece from shifting or tilting during processing. By maintaining concentricity, it can be ensured that the workpiece can be sprayed evenly during processing, thereby improving processing accuracy and surface quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of workpiece clamping according to an embodiment of the present invention is shown;

[0019] Figure 2 The overall structure provided by the embodiment of the present invention is shown Figure 1 ;

[0020] Figure 3 The overall structure provided by the embodiment of the present invention is shown Figure 2 ;

[0021] Figure 4 A schematic diagram of the structure inside a fixed frame provided according to an embodiment of the present invention is shown;

[0022] Figure 5 A schematic structural diagram of a driving mechanism provided according to an embodiment of the present invention is shown;

[0023] Figure 6 A schematic diagram of the structure of a driving gear provided according to an embodiment of the present invention is shown;

[0024] Figure 7 A schematic structural diagram of a positioning column provided according to an embodiment of the present invention is shown;

[0025] Figure 8 A schematic diagram showing the connection between the positioning column and the movable column provided in an embodiment of the present invention is shown;

[0026] Fig. 9 A schematic structural diagram of a reinforcement assembly provided according to an embodiment of the present invention is shown;

[0027] Fig.10 A structural schematic diagram of an installation component provided according to an embodiment of the present invention is shown.

[0028] Legend:

[0029] 1. Fixed frame; 11. Notch; 2. Driving mechanism; 21. Driving gear; 211. Connecting shaft; 212. Electromagnetic brake; 22. First transmission rack; 23. Second transmission rack; 24. Sliding seat; 241. Plug-in hole; 25. Handle; 3. Positioning column; 31. Plug-in terminal; 32. Limiting strip; 33. Threaded terminal; 34. Locking nut; 35. Positioning bolt; 36. Reinforcement component; 361. Fixed sleeve; 362. Connecting terminal; 363. Top head; 364. Spring; 4. Movable column; 41. Movable rod; 42. Positioning screw hole; 5. Mounting component; 51. Mounting sleeve; 52. Mounting frame; 53. Locking bolt; 54. Locking screw hole. DETAILED DESCRIPTION

[0030] 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.

[0031] Reference Figure 1-Figure 10 A concentric circle quick positioning fixture provided in this embodiment includes a fixed frame 1 arranged in a cross shape, and four positioning columns 3 are arranged on the fixed frame 1 at the ends of the directions thereof respectively. The four positioning columns 3 are connected by a driving mechanism 2 arranged in the fixed frame 1, and a movable column 4 arranged coaxially therewith is arranged on the positioning column 3. A mounting assembly 5 for connecting and positioning the fixture with a turntable is arranged on the rear side of the fixed frame 1. When any positioning column 3 is moved, the driving mechanism 2 can realize the synchronous contraction or expansion of the other three positioning columns 3.

[0032] In the present invention, the tooling fixture is installed and fixed on the turntable through the installation component 5 on the fixed frame 1, so that the center of the fixed frame 1 is kept concentric with the center of the turntable, and then one end of the circular workpiece that needs to be sandblasted is placed in the clamping space between the four positioning columns 3. At this time, any one of the positioning columns 3 is moved. Any one of the positioning columns 3 can drive the other three positioning columns 3 to move synchronously through the driving mechanism 2 during movement, which can ensure that the four positioning columns 3 always maintain concentricity with the turntable during the movement, and then ensure that the workpiece between the positioning columns 3 is kept concentric with the turntable, and ensure that the workpiece can be evenly sprayed during the processing. The movable column 4 set at the front end of the positioning column 3 can play a role of auxiliary clamping when the workpiece is long, thereby ensuring the stability of the workpiece on the fixture.

[0033] Specifically, Figure 2 , Figure 4-Figure 6As shown, the driving mechanism 2 includes a driving gear 21 rotatably mounted on the fixed frame 1 by a bearing, and a rack group arranged in the fixed frame 1 and arranged in a ring shape along the driving gear 21. A slide groove cooperating with the rack group to realize the movement of the rack group is arranged in the fixed frame 1. The rack group includes a pair of first transmission racks 22 arranged longitudinally, and a pair of second transmission racks 23 arranged transversely. The first transmission rack 22 is hollowed out and the second transmission rack 23 passes through the first transmission rack 22. The ends of the first transmission rack 22 and the second transmission rack 23 are both provided with a slide seat 24 located in the slot 11 through a mounting rod. The positioning column 3 is arranged on the slide seat 24, and a handle 25 is arranged on the rear side of the slide seat 24.

[0034] Among them, when moving any one of the positioning columns 3, the operator pulls the slide 24 through the handle 25 to move, so that the slide 24 slides in the slot 11, and then the positioning column 3 on the slide 24 moves. When the slide 24 moves, the slide 24 drives one of the racks to move. Since the first transmission rack 22 and the second transmission rack 23 are arranged in a ring shape on the driving gear 21, when one of the racks moves, it will drive the driving gear 21 meshing with it to rotate, and the rotation of the driving gear 21 will drive the movement of the other three racks meshing with it, thereby realizing the synchronous movement of the other three positioning columns 3 and the moving positioning column 3, ensuring that the four positioning columns 3 maintain accurate relative positions in space, which can greatly reduce the error accumulation caused by the movement of a single positioning column 3, and improve the positioning accuracy of the entire fixture;

[0035] It should be noted that, since the first transmission rack 22 is hollowed out and the second transmission rack 23 passes through the first transmission rack 22, when any one transmission rack moves, it will not interfere with the other racks. At the same time, a connecting shaft 211 passing through the bearing is provided on the driving gear 21, and an electromagnetic brake 212 connected to the fixed frame 1 is provided on the connecting shaft 211. The electromagnetic brake 212 is a braking structure for the entire fixture. When the positioning column 3 needs to be moved, the electromagnetic brake 212 is turned on. At this time, the driving mechanism 2 can be driven to rotate. After the positioning column 3 is moved to a good position and the workpiece to be sandblasted is clamped, the electromagnetic brake 212 is used to fix the connecting shaft 211 of the driving gear 21. At this time, the driving gear 21 cannot rotate, thereby ensuring the stability of the four positioning columns 3 so that the workpiece can be clamped and fixed.

[0036] Specifically, Figure 2 , Figure 7 and Figure 8As shown, the rear end of the positioning column 3 is provided with a plug-in terminal 31 that passes through the sliding seat 24, and the plug-in terminal 31 is provided with a limit clamping strip 32 coaxially arranged therewith, and the sliding seat 24 is provided with a plug-in hole 241 that matches the plug-in terminal 31, and the plug-in terminal 31 is provided with a locking nut 34 that abuts against the sliding seat 24 through a threaded terminal 33, and the rear end of the movable column 4 is provided with a movable rod 41 that extends to the inside of the positioning column 3, and the movable rod 41 is provided with a plurality of positioning screw holes 42 along its length direction, and the positioning column 3 is provided with a positioning bolt 35 that matches the positioning screw hole 42.

[0037] When the workpiece to be clamped is long, the positioning bolt 35 on the positioning column 3 can be loosened to disengage the positioning screw hole 42 of the movable rod 41, and then the movable column 4 is moved to make the movable column 4 extend forward, and then the positioning bolt 35 is screwed into the positioning screw hole 42 at the corresponding position, so as to adjust the position of the movable column 4 at the front end of the positioning column 3, and then the longer workpiece can be clamped and fixed, ensuring the stability of the workpiece between the positioning columns 3. When the positioning column 3 needs to be disassembled, repaired or replaced, the locking nut 34 on the threaded end 33 is removed, and then the plug-in end 31 of the positioning column 3 is pulled out from the plug-in hole 241 of the slide seat 24, so as to realize convenient disassembly and assembly of the positioning column 3, and the limiting card strip 32 on the plug-in end 31 plays a limiting role. When the positioning column 3 is connected to the slide seat 24 through the plug-in end 31, the positioning column 3 can be prevented from rotating, thereby improving the stability and accuracy of the entire clamp.

[0038] It should be noted that if Figure 8 and Fig. 9 As shown, a reinforcement component 36 is provided on one side of the positioning column 3 and the movable column 4 facing the axis of the fixed frame 1 through an installation groove, and the reinforcement component 36 includes a fixing sleeve 361 located in the installation groove, a connecting end 362 is sleeved on the fixing sleeve 361, and a top head 363 is provided on the connecting end 362, and a spring 364 is provided between the connecting end 362 and the fixing sleeve 361.

[0039] Among them, when the positioning column 3 is moved to clamp and fix the workpiece that needs sandblasting, the top head 363 of the reinforcement component 36 on the positioning column 3 first contacts the workpiece. Since the top head 363 is made of rubber and cooperates with the spring 364 in the fixing sleeve 361 to make the reinforcement component 36 have a buffering effect, when the positioning column 3 clamps the workpiece, it can avoid damage to the workpiece caused by excessive impact force when the positioning column 3 moves. At the same time, the buffering of the reinforcement component 36 can absorb the vibration force during workpiece processing, thereby improving the stability of the workpiece between the positioning columns 3.

[0040] Specifically, Figure 3 and Fig.10As shown, the mounting assembly 5 includes a mounting sleeve 51 connected to the fixed frame 1, and a mounting frame 52 is sleeved on the mounting sleeve 51. The mounting frame 52 is provided with a plurality of locking screw holes 54 arranged along its length direction, and the mounting sleeve 51 is provided with a locking bolt 53 that matches the locking screw hole 54.

[0041] When the clamp is installed on the turntable, the mounting frame 52 is connected to the turntable. When the distance between the clamp and the turntable needs to be adjusted, the locking bolt 53 on the mounting sleeve 51 can be loosened to disengage it from the locking screw hole 54 of the mounting frame 52. Then the mounting frame 52 and the mounting sleeve 51 can be moved relative to each other, thereby adjusting the overall length of the mounting assembly 5, so that the clamp can adjust the distance from the turntable according to actual usage needs, thereby improving the use effect of the clamp.

[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A concentric circle rapid positioning fixture, characterized in that: The invention comprises a fixed frame (1) arranged in a cross shape, wherein the fixed frame (1) is provided with four positioning columns (3) respectively located at the ends of the fixed frame (1), wherein the four positioning columns (3) are connected via a driving mechanism (2) arranged in the fixed frame (1), wherein the positioning columns (3) are provided with movable columns (4) arranged coaxially therewith, and a mounting assembly (5) for connecting and positioning a fixture with a turntable is provided on the rear side surface of the fixed frame (1); When any one of the positioning columns (3) is moved, the other three positioning columns (3) can be synchronously contracted or expanded through the driving mechanism (2).

2. The concentric circle quick positioning fixture according to claim 1, characterized in that: The driving mechanism (2) comprises a driving gear (21) rotatably mounted on a fixed frame (1) by means of a bearing, and a rack group arranged in the fixed frame (1) and in a ring shape along the driving gear (21); a sliding groove is arranged in the fixed frame (1) and cooperates with the rack group to realize the movement of the rack group.

3. The concentric circle quick positioning fixture according to claim 2, characterized in that: The rack assembly comprises a pair of first transmission racks (22) arranged longitudinally, and a pair of second transmission racks (23) arranged transversely, wherein the first transmission racks (22) are hollowed out and the second transmission racks (23) pass through the first transmission racks (22).

4. The concentric circle quick positioning fixture according to claim 3, characterized in that: The ends of the first transmission rack (22) and the second transmission rack (23) are both provided with a sliding seat (24) located in the slot (11) through a mounting rod, the positioning column (3) is arranged on the sliding seat (24), and a handle (25) is arranged on the rear side of the sliding seat (24).

5. The concentric circle quick positioning fixture according to claim 4, characterized in that: The driving gear (21) is provided with a connecting shaft (211) penetrating the bearing, and the connecting shaft (211) is provided with an electromagnetic brake (212) connected to the fixed frame (1).

6. The concentric circle quick positioning fixture according to claim 4, characterized in that: The rear end of the positioning column (3) is provided with a plug-in terminal (31) that passes through the sliding seat (24), and the plug-in terminal (31) is provided with a limit clamping strip (32) coaxially arranged therewith, and the sliding seat (24) is provided with a plug-in hole (241) that matches the plug-in terminal (31), and the plug-in terminal (31) is provided with a locking nut (34) that abuts against the sliding seat (24) through a threaded terminal (33).

7. The concentric circle quick positioning fixture according to claim 6, characterized in that: A movable rod (41) extending into the interior of the positioning column (3) is provided at the rear end of the movable column (4), a plurality of positioning screw holes (42) are provided on the movable rod (41) along its length direction, and a positioning bolt (35) matching with the positioning screw hole (42) is provided on the positioning column (3).

8. The concentric circle quick positioning fixture according to claim 7, characterized in that: A reinforcement component (36) is provided on a side of the positioning column (3) and the movable column (4) facing the axis of the fixed frame (1) through a mounting groove; The reinforcement component (36) comprises a fixing sleeve (361) located in the installation groove, a connecting end (362) is sleeved on the fixing sleeve (361), a top head (363) is arranged on the connecting end (362), and a spring (364) is arranged between the connecting end (362) and the fixing sleeve (361).

9. The concentric circle rapid positioning fixture according to claim 1, characterized in that: The mounting assembly (5) comprises a mounting sleeve (51) connected to a fixed frame (1); a mounting frame (52) is sleeved on the mounting sleeve (51); the mounting frame (52) is provided with a plurality of locking screw holes (54) arranged along its length direction; and the mounting sleeve (51) is provided with locking bolts (53) matching with the locking screw holes (54).

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