Hand-adjustable CNC jig

Abstract

The utility model discloses a hand-adjustable CNC (computer numerical control) jig, relates to the related field of CNC jigs, and aims to solve the problems that when a CNC machining jig in the prior art fixes a workpiece, the workpiece needs to be placed on an operation table top, whether a workpiece placement center shaft is consistent with a center shaft of the operation table top or not is uncertain during placement, and the machining efficiency is high. And a visual auxiliary structure is needed to determine the machining position during grinding or other machining operation, then machining is conducted, and the requirement for the operation precision of all the structures is high. The middle fixing unit comprises a middle fixing block, an action cavity is formed in the middle fixing block, an adjusting hand wheel is arranged at the front end of the middle fixing block, a rotating shaft of the adjusting hand wheel extends into the action cavity and is connected with a first bevel gear, and one side of the rear end of the first bevel gear is connected with a second bevel gear in a meshed mode. Rotating rods are fixed to the left side and the right side of the second bevel gear, extend to the outer side of the middle fixing block and are connected with threaded rods.

Description

Technical Field

[0001] The utility model relates to the relevant field of CNC fixtures, in particular to a hand-adjustable CNC fixture. Background Art

[0002] CNC is the abbreviation of computer numerical control machine tool, which is an automated machine tool controlled by a program. Generally, CNC processing usually refers to computer digital control precision machining. CNC machining fixtures can ensure stability and accuracy during the machining process through precise positioning and fixation. It can provide better support and fixation, avoid errors caused by tool vibration and workpiece movement, and thus improve machining quality. In addition, CNC machining fixtures can also achieve "n times of machining, one clamping", which greatly improves production efficiency.

[0003] CNC workpiece fixtures are divided into five types according to their uses; 1. Universal fixtures, which can be used for any workpiece and are easy to adjust. Each part of the fixture can be adjusted and replaced to adapt to any workpiece; 2. Special fixtures, which are CNC fixtures suitable for specific workpieces, have great advantages in stability when used with special workpieces; 3. Assembly fixtures, assembled CNC fixtures can only appear after the workpiece is considered; 4. Modular fixtures, which are fixtures that are easy to rebuild and reconfigure to adapt to any workpiece. They are composed of interchangeable parts and are very suitable for handling many workpieces; 5. Combination fixtures, which have different sizes and shapes, are suitable for processing many workpieces of different sizes and shapes according to the machine tool.

[0004] When the CNC machining fixture fixes the workpiece, the workpiece needs to be placed on the operating table and then fixed using a locking structure. However, when placing the workpiece, it is not certain whether the center axis of the workpiece is consistent with the center axis of the operating table. Therefore, when performing grinding or other machining operations, a visual auxiliary structure is needed to determine the machining position before machining is performed, which requires high operating accuracy for each structure. Utility Model Content

[0005] The purpose of the utility model is to provide a hand-adjustable CNC fixture to solve the problem that when the CNC machining fixture proposed in the above background technology fixes the workpiece, the workpiece needs to be placed on an operating table, and when placing the workpiece, it is uncertain whether the center axis of the workpiece is consistent with the center axis of the operating table, so that during grinding or other machining operations, a visual auxiliary structure is needed to determine the machining position before machining is performed, and high operating accuracy is required for each structure.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a hand-adjustable CNC fixture, comprising an intermediate fixing unit, the intermediate fixing unit comprising an intermediate fixing block, the interior of the intermediate fixing block is set as an action cavity, the front end of the intermediate fixing block is provided with an adjusting hand wheel, the rotating shaft of the adjusting hand wheel extends into the interior of the action cavity and is connected with a first bevel gear, one side of the rear end of the first bevel gear is meshedly connected with a second bevel gear, the left and right sides of the second bevel gear are fixed with rotating rods, the rotating rods extend to the outside of the intermediate fixing block and are connected with a threaded rod;

[0007] Side adjustment units are arranged on both sides of the middle fixing unit. The side adjustment units include side adjustment blocks. The other side of the threaded rod extends into the inside of the side adjustment block and is connected to the side adjustment block through threads.

[0008] Preferably, side limit rods are fixed to the upper ends of both sides of the middle fixed block, and the other ends of the side limit rods extend into the inside of the side adjustment block and are slidably connected to the side adjustment block.

[0009] Preferably, the upper end of the middle fixed block is rotatably connected to an upper adsorption plate, a fixed net is fixed to the upper end surface of the upper adsorption plate, an adsorption cavity is formed inside the upper adsorption plate along the lower end of the fixed net, and a connecting pipe is installed on the upper adsorption plate, one end of the connecting pipe extends into the adsorption cavity, and the other end of the connecting pipe extends outward.

[0010] Preferably, a fixed bracket is provided on the outside of the side adjustment block, and the fixed bracket includes an upper horizontal plate and a fixed vertical plate. The fixed vertical plate is integrally connected to the two ends of the lower end of the upper horizontal plate. The upper end surface of the upper horizontal plate is flush with the upper end surface of the upper adsorption plate, and the fixed vertical plate is in contact with the end surface of the side adjustment block. The fixed bracket is fixed to the side adjustment block by fixing bolts.

[0011] Preferably, an L-shaped plate is fixed in the middle of the outer side of the upper end of the upper horizontal plate, a lifting rod is threadedly connected to the middle of the horizontal part of the L-shaped plate, the lower end of the outer surface of the lifting rod is smooth, and the lower end of the lifting rod is rotatably connected to the lower horizontal pressure plate through a bearing, and a pressure spring is arranged between the lower horizontal pressure plate and the horizontal part of the L-shaped plate along the outside of the lifting rod.

[0012] Preferably, vertical limit rods are fixed to the front and rear ends of the upper end of the lower horizontal pressing plate, and the vertical limit rods slide along the horizontal part of the L-shaped plate.

[0013] Preferably, a mounting frame is welded and fixed to the lower end of the middle fixing block, a mounting hole is provided on the mounting frame, and the lower end surface of the mounting frame is located at the lower end of the lower end surface of the side adjustment block.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. In the utility model, the first bevel gear is rotated to rotate by rotating the adjusting hand wheel, and the rotating rod and the threaded rod are rotated by the meshing connection relationship between the first bevel gear and the second bevel gear. Under the rotation of the threaded rod, the side adjusting block threadedly connected to the threaded rod drives the fixed bracket to move inward until the end face of one of the L-shaped plates contacts the workpiece, and the adjusting hand wheel is continued to be rotated, and the workpiece is pushed to move by the L-shaped plate that moves inward synchronously so that the position of the workpiece is in a centered state; then the adjusting hand wheel is reversely rotated to drive the fixed bracket away, and then the upper adsorption plate is rotated ninety degrees, and the above fixing operation is repeated, so that the L-shaped plate fixes the other two sides of the workpiece by pressure, and the workpiece is driven to move by the synchronous inward movement of the two-part structure, which can ensure that the workpiece placement center is consistent with the center of the target placement position of the operating table, so that the processing equipment can accurately process, and no visual auxiliary structure is required to assist in completing the processing operation, which solves the problem that when the CNC processing fixture fixes the workpiece, the workpiece needs to be placed on the operating table, and it is uncertain whether the workpiece placement center axis is consistent with the operating table center axis during placement, so that the visual auxiliary structure is required to determine the processing position during grinding or other processing operations, and then the processing is performed, and the operation accuracy of each structure is required to be high.

[0016] 2. In the utility model, the workpiece is placed on the upper adsorption plate, and the external driving pump is turned on to extract the air inside the adsorption chamber, so that a negative pressure environment is formed between the upper adsorption plate and the workpiece, and the workpiece is adsorbed. At this time, the position of the workpiece itself will not be affected when adjusting the fixed bracket; and when reversing is required, the upper adsorption plate is used for re-adsorption, and the adjusting hand wheel is rotated in the reverse direction to drive the fixed bracket away, and then the upper adsorption plate is rotated ninety degrees. The adjusted position of the workpiece will not be changed, which assists in completing the position adjustment work and has stronger integrity.

[0017] 3. In the utility model, the lifting rod is rotated, and due to the threaded connection between the lifting rod and the L-shaped plate, the lower horizontal pressure plate moves downward, and then the threaded section of the lifting rod is separated from the L-shaped plate, and the lower horizontal pressure plate is pressed down by the pressure spring to fix the workpiece from the upper end; the lifting rod is lifted upward so that the threaded section of the lifting rod is located at the lower end of the L-shaped plate, and then the lifting rod is lifted in the opposite direction. The threaded connection between the lifting rod and the L-shaped plate fixes the position of the lifting rod, and the lower horizontal pressure plate will not fit with the upper horizontal plate due to the presence of the pressure spring, thereby not affecting the contact and fixing relationship between the end face of the L-shaped plate and the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of a hand-adjustable CNC fixture of the utility model;

[0019] Figure 2 This is a front view of a hand-adjustable CNC fixture of the utility model;

[0020] Figure 3This is a structural cross-sectional view of the AA position of a hand-adjustable CNC fixture of the utility model;

[0021] Figure 4 A top view of a hand-adjustable CNC fixture of the utility model;

[0022] Figure 5 This is a cross-sectional view of the BB structure of a hand-adjustable CNC fixture of the utility model.

[0023] In the figure: 1. intermediate fixing unit; 2. upper adsorption plate; 3. fixing net; 4. adsorption chamber; 5. connecting pipe; 6. intermediate fixing block; 7. action chamber; 8. adjusting hand wheel; 9. first bevel gear; 10. second bevel gear; 11. rotating rod; 12. threaded rod; 13. mounting frame; 14. side limit rod; 15. side adjustment unit; 16. side adjustment block; 17. fixing bracket; 18. upper horizontal plate; 19. fixing vertical plate; 20. fixing bolt; 21. L-shaped plate; 22. lifting rod; 23. pressure spring; 24. lower horizontal pressure plate; 25. vertical limit rod. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0025] See also Figure 1-5 The utility model provides an embodiment: a hand-adjustable CNC fixture, including an intermediate fixing unit 1, the intermediate fixing unit 1 includes an intermediate fixing block 6, a mounting frame 13 is welded and fixed at the lower end of the intermediate fixing block 6, and a mounting hole is provided on the mounting frame 13; the interior of the intermediate fixing block 6 is provided with an action cavity 7, and an adjusting hand wheel 8 is provided at the front end of the intermediate fixing block 6, and the rotating shaft of the adjusting hand wheel 8 extends to the interior of the action cavity 7 and is connected with a first bevel gear 9, and a second bevel gear 10 is meshed and connected at one side of the rear end of the first bevel gear 9, and a rotating rod 11 is fixed on the left and right sides of the second bevel gear 10, and the rotating rod 11 extends to the outside of the intermediate fixing block 6 and is connected with a threaded rod 12;

[0026] Side adjustment units 15 are arranged on both sides of the middle fixing unit 1. The side adjustment units 15 include side adjustment blocks 16. The other side of the threaded rod 12 extends into the inside of the side adjustment block 16 and is connected to the side adjustment block 16 by threads. The lower end surface of the mounting frame 13 is located at the lower end of the lower end surface of the side adjustment block 16.

[0027] Side limiting rods 14 are fixed to the upper ends of both sides of the middle fixing block 6 , and the other ends of the side limiting rods 14 extend into the inside of the side adjusting block 16 and are slidably connected to the side adjusting block 16 .

[0028] Furthermore, the upper end of the middle fixed block 6 is rotatably connected to the upper adsorption plate 2, and a fixed net 3 is fixed to the upper end surface of the upper adsorption plate 2. An adsorption chamber 4 is formed inside the upper adsorption plate 2 along the lower end of the fixed net 3. A connecting pipe 5 is installed on the upper adsorption plate 2, and one end of the connecting pipe 5 extends into the adsorption chamber 4, and the other end of the connecting pipe 5 extends outward. The air inside the adsorption chamber 4 is extracted through the connecting pipe 5, so that a negative pressure environment is formed between the upper adsorption plate 2 and the workpiece, and the workpiece is adsorbed. When adjusting the fixed bracket 17, the position of the workpiece itself will not be affected; when reversing, the upper adsorption plate 2 is used for re-adsorption, and the upper adsorption plate 2 is rotated 90 degrees, and the adjusted position of the workpiece will not be changed.

[0029] Furthermore, a fixed bracket 17 is provided outside the side adjustment block 16, and the fixed bracket 17 includes an upper horizontal plate 18 and a fixed vertical plate 19. The fixed vertical plate 19 is integrally connected to the two ends of the lower end of the upper horizontal plate 18. The upper end surface of the upper horizontal plate 18 is flush with the upper end surface of the upper adsorption disk 2. The placement plane of the workpiece needs to be flush to avoid the workpiece from being tilted. The fixed vertical plate 19 fits the end surface of the side adjustment block 16. The fixed bracket 17 and the side adjustment block 16 are fixed by fixing bolts 20. The fixed bracket 17 can be disassembled and replaced. The fixed bracket 17 can be used for plate-shaped workpieces or disc-shaped workpieces. An L-shaped Plate 21, the horizontal part of the L-shaped plate 21 is connected with a lifting rod 22 through a thread in the middle, the lower end of the outer surface of the lifting rod 22 is smooth, and the lower end of the lifting rod 22 is rotatably connected to a lower horizontal pressure plate 24 through a bearing, and a pressure spring 23 is arranged on the outside of the lower horizontal pressure plate 24 and the horizontal part of the L-shaped plate 21 along the lifting rod 22. The two ends of the pressure spring 23 can be fixed and twisted, compressed or extended as it rotates, and the upper end can also be fixed on a turntable that can rotate. This part does not affect the overall working process, and the front and rear ends of the upper end of the lower horizontal pressure plate 24 are fixed with vertical limit rods 25, which slide along the horizontal part of the L-shaped plate 21 to play a limiting role.

[0030] Working principle: The fixture is installed on the operating table of the processing equipment through the mounting frame 13, and a suitable fixing bracket 17 is selected according to the shape of the workpiece; the fixing vertical plate 19 of the fixing bracket 17 is pushed in along the outer side of the side adjustment block 16 or from the upper end downward, and then fixed with the fixing bolts 20.

[0031] The workpiece is placed on the upper adsorption plate 2, and the external drive pump is turned on to extract the air inside the adsorption chamber 4, so that a negative pressure environment is formed between the upper adsorption plate 2 and the workpiece, and the workpiece is adsorbed. Then, the adjusting hand wheel 8 is turned to drive the first bevel gear 9 to rotate, and the meshing connection relationship between the first bevel gear 9 and the second bevel gear 10 drives the rotating rod 11 and the threaded rod 12 to rotate. Under the rotation of the threaded rod 12, the side adjustment block 16 threadedly connected to the threaded rod 12 drives the fixed bracket 17 to move inward until the end face of one of the L-shaped plates 21 contacts the workpiece; the adsorption of the workpiece on the upper adsorption plate 2 is released, and the adjusting hand wheel 8 is continued to be turned, and the L-shaped plate 21 that moves inward synchronously is used to push the workpiece to move so that the workpiece position is in a centered state, and the positions of the two sides of the workpiece are fixed by pressure. Then, the upper adsorption plate 2 is used for re-adsorption, and the adjusting hand wheel 8 is turned in the opposite direction to drive the fixed bracket 17 away, and then the upper adsorption plate 2 is rotated 90 degrees, and the above fixing operation is repeated, so that the L-shaped plate 21 fixes the other two sides of the workpiece by pressure.

[0032] The lifting rod 22 is rotated, and due to the threaded connection between the lifting rod 22 and the L-shaped plate 21, the lower horizontal pressure plate 24 moves downward, and then the threaded section of the lifting rod 22 disengages from the L-shaped plate 21, and the lower horizontal pressure plate 24 is pressed downward by the pressure spring 23, thereby fixing the workpiece from the upper end again, and the processing equipment processes it.

[0033] After a single processing is completed, the connection between the mounting frame 13 and the operating table of the processing equipment can be removed, and the mounting frame 13 can be placed on the operating table of other processing equipment to continue processing.

[0034] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A hand-adjustable CNC fixture, comprising an intermediate fixing unit (1), characterized in that: The intermediate fixing unit (1) comprises an intermediate fixing block (6), the interior of the intermediate fixing block (6) being arranged as an action chamber (7), an adjusting hand wheel (8) being arranged at the front end of the intermediate fixing block (6), a rotating shaft of the adjusting hand wheel (8) extending into the interior of the action chamber (7) and being connected to a first bevel gear (9), a rear end of the first bevel gear (9) being meshingly connected to a second bevel gear (10), a rotating rod (11) being fixed to the left and right sides of the second bevel gear (10), the rotating rod (11) extending to the outside of the intermediate fixing block (6) and being connected to a threaded rod (12); side adjusting units (15) are arranged on both sides of the intermediate fixing unit (1), the side adjusting units (15) comprising side adjusting blocks (16), the other side of the threaded rod (12) extending into the interior of the side adjusting block (16) and being threadedly connected to the side adjusting block (16).

2. A hand-adjustable CNC fixture according to claim 1, characterized in that: Side limit rods (14) are fixed to the upper ends of both sides of the middle fixed block (6), and the other ends of the side limit rods (14) extend into the inside of the side adjustment block (16) and are slidably connected to the side adjustment block (16).

3. A hand-adjustable CNC fixture according to claim 1, characterized in that: The upper end of the intermediate fixed block (6) is rotatably connected to an upper adsorption plate (2), a fixed net (3) is fixed to the upper end surface of the upper adsorption plate (2), an adsorption chamber (4) is formed inside the upper adsorption plate (2) along the lower end of the fixed net (3), and a connecting pipe (5) is installed on the upper adsorption plate (2), one end of the connecting pipe (5) extends into the adsorption chamber (4), and the other end of the connecting pipe (5) extends outward.

4. A hand-adjustable CNC fixture according to claim 3, characterized in that: A fixed bracket (17) is arranged outside the side adjustment block (16), and the fixed bracket (17) comprises an upper horizontal plate (18) and a fixed vertical plate (19). The fixed vertical plate (19) is integrally connected to the two ends of the lower end of the upper horizontal plate (18). The upper end surface of the upper horizontal plate (18) is flush with the upper end surface of the upper adsorption plate (2). The fixed vertical plate (19) is in contact with the end surface of the side adjustment block (16). The fixed bracket (17) and the side adjustment block (16) are fixed by fixing bolts (20).

5. A hand-adjustable CNC fixture according to claim 4, characterized in that: An L-shaped plate (21) is fixed in the middle of the outer side of the upper end of the upper horizontal plate (18), and a lifting rod (22) is threadedly connected to the middle of the horizontal part of the L-shaped plate (21). The lower end of the outer surface of the lifting rod (22) is smooth, and the lower end of the lifting rod (22) is rotatably connected to a lower horizontal pressure plate (24) through a bearing. A pressure spring (23) is arranged between the lower horizontal pressure plate (24) and the horizontal part of the L-shaped plate (21) along the outside of the lifting rod (22).

6. A hand-adjustable CNC fixture according to claim 5, characterized in that: A vertical limiting rod (25) is fixed at the front and rear ends of the upper end of the lower horizontal pressing plate (24), and the vertical limiting rod (25) slides along the horizontal portion of the L-shaped plate (21).

7. The hand-adjustable CNC fixture according to claim 1, characterized in that: A mounting frame (13) is welded and fixed to the lower end of the middle fixing block (6), a mounting hole is provided on the mounting frame (13), and the lower end surface of the mounting frame (13) is located at the lower end of the lower end surface of the side adjustment block (16).

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