Positioning and clamping device for CNC machining

Abstract

The utility model provides a positioning and clamping device for CNC processing, including work table, the central part of work table is provided with clamping seat, the section of clamping seat is "" type, and the both ends of clamping seat are equipped with wedge block, be equipped with the lifting trapezoidal block in clamping seat, and trapezoidal block is the shape of inverted trapezoid with big top and small bottom, and both sides are inclined surface, the wedge surface of wedge block is opposite the inclined surface of trapezoidal block, work table still is equipped with two stoppers, and two stoppers are located clamping seat's both sides respectively, the bottom central part of work table is equipped with the cylinder, and the piston rod top end of cylinder is connected with trapezoidal block, the utility model discloses through the cylinder drive trapezoidal block elevating, utilizes the inclined surface of trapezoidal block and the wedge surface cooperation of wedge block, makes the wedge block of clamping seat both ends open or contract to both sides, and one step operation can realize the quick clamping and loosening of both sides workpiece, and clamping speed is fast, improves the CNC processing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of fixture technology, and in particular to a positioning and clamping device for CNC machining. Background Technology

[0002] In CNC machining, reliable workpiece positioning and clamping are essential to ensure machining accuracy and safety. Currently, commonly used positioning and clamping devices have several shortcomings: First, most clamping devices have complex structures, are cumbersome to operate, and have slow clamping speeds, which cannot meet the needs of high-efficiency processing. Second, many automatic clamping devices can only clamp one workpiece at a time, which to some extent limits the further improvement of production efficiency and capacity.

[0003] Therefore, it is essential to develop a positioning and clamping device for CNC machining that can quickly and stably position and clamp workpieces, and that is simple in structure and easy to operate. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a positioning and clamping device for CNC machining, which solves the problems of slow clamping speed and only being able to clamp one device at a time in the prior art.

[0005] To achieve the above and other related objectives, this utility model provides a positioning and clamping device for CNC machining, including a worktable, a clamping seat at the center of the worktable, the clamping seat having a U-shaped cross-section, and wedge blocks at both ends of the clamping seat; a liftable trapezoidal block is provided inside the clamping seat, the trapezoidal block having an inverted trapezoidal shape with a larger top and a smaller bottom and sloping sides; the wedge surface of the wedge block faces the sloping side of the trapezoidal block; two stops are also provided on the worktable, the two stops being located on both sides of the clamping seat; a cylinder is provided at the center of the bottom of the worktable, the top of the piston rod of the cylinder being connected to the trapezoidal block.

[0006] In one embodiment of the present invention, the two ends of the clamping seat are made of elastic material.

[0007] In one embodiment of the present invention, a first through hole is provided in the center of the workbench for the piston rod of the cylinder to pass through; a countersunk hole is provided in the center of the trapezoidal block, and the top of the piston rod and the countersunk hole of the trapezoidal block are connected by screws.

[0008] In one embodiment of the present invention, the stop block includes a platform portion, and a first step portion is provided on the outer side of the platform portion. After the workpiece is placed on the upper surface of the platform portion, the workpiece is clamped by the cooperation of the first step portion and the wedge block.

[0009] In one embodiment of the present invention, the platform portion is provided with a downwardly recessed second step portion on the inner side, and the height of the second step portion is lower than the height of the clamping seat.

[0010] In one embodiment of this utility model, the trapezoidal block is in the shape of an isosceles trapezoid.

[0011] In one embodiment of this utility model, a positioning block is provided at the bottom of the worktable, and a plurality of positioning pins are provided on the positioning block. A second through hole is provided on the worktable for the positioning pins to pass through. A third through hole is provided in the center of the positioning block, and the piston rod of the cylinder passes through the third through hole. A retaining ring for pushing the positioning block is provided at the bottom end of the piston rod. A spring is provided between the worktable and the positioning block.

[0012] In one embodiment of this utility model, two fourth through holes are symmetrically opened on the positioning block, and a guide sleeve is fixedly connected in the fourth through hole; a guide post is provided at the corresponding position on the bottom of the worktable, and the guide post and the guide sleeve are slidably connected; the spring is sleeved outside the guide post and located between the worktable and the guide sleeve.

[0013] In one embodiment of this utility model, a plurality of columns are provided between the workbench and the cylinder, and the positioning block is provided with a sliding groove that cooperates with the columns.

[0014] As described above, the positioning and clamping device for CNC machining of this utility model has the following beneficial effects: 1. This utility model uses a cylinder to drive the trapezoidal block to rise and fall. By utilizing the inclined surface of the trapezoidal block and the wedge surface of the wedge block, the wedge blocks at both ends of the clamping seat can be opened or closed to the sides. The workpieces on both sides can be quickly clamped and released in one operation. The clamping speed is fast and the CNC machining efficiency is improved.

[0015] 2. The trapezoidal block is in the shape of an inverted trapezoid, and the wedge face of the wedge block is directly opposite the inclined surface of the trapezoidal block. During the clamping process, the wedge block can apply a uniform clamping force to the workpiece, avoiding deformation or loosening of the workpiece due to uneven force, thus ensuring machining accuracy.

[0016] 3. Through optimized design, two workpieces can be locked simultaneously, reducing the use of mechanisms, improving processing efficiency, and enhancing overall processing efficiency.

[0017] 4. Before clamping, the positioning pin and the stop block can accurately position the workpiece to ensure the accuracy of clamping. After the cylinder piston rod descends, the workpiece is clamped, and at the same time, the positioning block descends under the action of the spring, which drives the positioning pin to descend as well, exposing the side of the workpiece, which is convenient for processing the side of the workpiece. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the structure of the positioning and clamping device for CNC machining disclosed in the embodiments of this utility model. Figure 1 .

[0019] Figure 2 This is a schematic diagram of the structure of the positioning and clamping device for CNC machining disclosed in the embodiments of this utility model. Figure 2 .

[0020] Figure 3 This is a disassembly diagram of the positioning and clamping device for CNC machining disclosed in the embodiments of this utility model.

[0021] Figure 4 This is a cross-sectional schematic diagram of the positioning and clamping device for CNC machining disclosed in the embodiments of this utility model.

[0022] Figure 5 This is a schematic diagram of the CNC machining positioning and clamping device disclosed in the embodiments of this utility model in its initial state.

[0023] Figure 6 This is a schematic diagram of the positioning and clamping device for CNC machining disclosed in the embodiments of this utility model in the clamping state.

[0024] Component designation explanation 1. Worktable; 11. First through hole; 12. Second through hole; 13. Guide post; 14. Column; 2. Clamping seat; 21. Wedge block; 3. Trapezoidal block; 4. Cylinder; 41. Piston rod; 42. Retaining ring; 5. Stop block; 51. Platform section; 52. First step section; 53. Second step section; 6. Positioning block; 61. Positioning post; 62. Third through hole; 63. Fourth through hole; 64. Guide sleeve; 65. Slide groove; 7. Spring. Detailed Implementation

[0025] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other.

[0026] Please see Figures 1-6 This utility model provides a positioning and clamping device for CNC machining, including a worktable 1. A clamping seat 2 is set in the center of the worktable 1. The clamping seat 2 has a U-shaped cross-section and wedge-shaped blocks 21 at both ends. The two ends of the clamping seat 2 are made of an elastic material, such as elastic steel. A liftable trapezoidal block 3 is provided inside the clamping seat 2. The trapezoidal block 3 is an inverted trapezoid with a larger top and smaller bottom, and sloping sides. The trapezoidal block 3 is also isosceles, ensuring uniform force distribution on both sides. Two stops 5 are also provided on the worktable 1, located on both sides of the clamping seat 2. The wedge surface of the wedge block 21 faces the inclined surface of the trapezoidal block 3. When the trapezoidal block 3 descends, the trapezoidal block 3 pushes the wedge block 21 through the action of the inclined surface, causing the two ends of the clamping seat 2 to deform under the force and open outward, thereby cooperating with the stop block 5 to clamp the workpiece. When the trapezoidal block 3 rises, the wedge block 21 can be reset under the elastic action of the clamping seat 2. refer to Figure 1 , 2 The stop block 5 includes a platform portion 51. A first step portion 52 protrudes from the outer side of the platform portion 51. After the workpiece is placed on the upper surface of the platform portion 51, the first step portion 52 and the wedge block 21 cooperate to clamp the workpiece. A second step portion 53, lower than the platform portion 51, is provided on the inner side of the platform portion 51. The height of the second step portion 53 is lower than the height of the clamping seat 2, and the two outer sides of the clamping seat 2 abut against the second step portion 53. This design ensures that the stop block 5 clamps the clamping seat 2, preventing the clamping seat 2 from shifting under force and guaranteeing clamping accuracy; it also prevents the stop block 5 from affecting the opening of the clamping seat 2, ensuring the normal operation of the clamping seat 2. A cylinder 4 is located at the center of the bottom of the workbench 1, and a first through hole 11 is opened in the center of the workbench 1 for the piston rod 41 of the cylinder 4 to pass through. A countersunk hole is opened in the center of the trapezoidal block 3, and the top of the piston rod 41 and the countersunk hole of the trapezoidal block 3 are connected by screws. This connection method is simple and reliable, and is easy to disassemble and install. The bottom of the worktable 1 is also equipped with a positioning block 6, which has several positioning pins 61. The worktable 1 has a second through hole 12 for the positioning pins 61 to pass through. The positioning pins 61 can assist in positioning the workpiece and improve positioning accuracy. A third through hole 62 is opened in the center of the positioning block 6, through which the piston rod 41 of the cylinder 4 passes. The bottom end of the piston rod 41 is equipped with a retaining ring 42 for pushing the positioning block 6. A spring 7 is provided between the worktable 1 and the positioning block 6. Specifically, two fourth through holes 63 are symmetrically opened on the positioning block 6, and a guide sleeve 64 is fixedly connected in the fourth through hole 63; a guide post 13 is provided at the corresponding position at the bottom of the worktable 1, and the guide post 13 and the guide sleeve 64 are slidably connected to ensure the stability of the positioning block 6 during the lifting process; the spring 7 is sleeved outside the guide post 13 and is located between the worktable 1 and the guide sleeve 64. Several columns 14 are provided between the worktable 1 and the cylinder 4. The positioning block 6 is provided with a sliding groove 65 that cooperates with the columns 14 to further improve the stability of the movement of the positioning block 6. The working principle of this device is as follows: In the initial state, refer to... Figure 5When the piston rod 41 of cylinder 4 is extended, the wedge block 21 is not under force and is in an upright state; at this time, the positioning block 6 is in an upward state under the push of the piston rod 41 retaining ring 42, and the positioning pin 61 extends higher than the platform part 51, which can position the workpiece. The workpiece is placed on the platform part 51 of the stop block 5, so that one side of the workpiece abuts against the first step part 52, and both ends are positioned by the positioning pin 61.

[0027] When clamping is required, refer to... Figure 6 The cylinder 4 is activated, causing the trapezoidal block 3 to descend. The inclined surfaces on both sides of the trapezoidal block 3 push the wedge blocks 21 at both ends of the clamping seat 2 to open to both sides, so that the wedge blocks 21 abut against the other side of the workpiece. Under the combined action of the wedge blocks 21 and the first step 52, the workpiece is clamped. At the same time, during the descent and extension of the piston rod 41, the positioning block 6 descends under the action of the spring 7. After it reaches below the platform 51, it will not affect the processing of the workpiece.

[0028] In summary, this invention uses a cylinder to drive the trapezoidal block to rise and fall. By utilizing the engagement of the inclined surface of the trapezoidal block and the wedge surface of the wedge block, the wedge blocks at both ends of the clamping seat open or retract to the sides. This allows for rapid clamping and releasing of workpieces on both sides in a single operation, resulting in fast clamping speed and improved CNC machining efficiency. Therefore, this invention effectively overcomes the various shortcomings of existing technologies and possesses high industrial application value.

[0029] The terms used in this specification, such as "upper", "lower", "left", "right", "front", "back", "middle" and "one", are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Any changes or adjustments to their relative relationships, without substantially altering the technical content, shall also be considered within the scope of implementation of this utility model.

[0030] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit this utility model. All equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A positioning and clamping device for CNC machining, characterized in that, The device includes a worktable, a clamping seat at the center of the worktable, the clamping seat having a U-shaped cross-section, and wedge-shaped blocks at both ends of the clamping seat; a liftable trapezoidal block inside the clamping seat, the trapezoidal block being an inverted trapezoid with a larger top and smaller bottom and sloping sides; the wedge surface of the wedge-shaped block facing the sloping side of the trapezoidal block; two stops on the worktable, located on opposite sides of the clamping seat; and a cylinder at the center of the bottom of the worktable, the piston rod of the cylinder being connected to the trapezoidal block.

2. The positioning and clamping device according to claim 1, characterized in that, The two ends of the clamping seat are made of elastic material.

3. The positioning and clamping device according to claim 1, characterized in that, The workbench has a first through hole in the center for the piston rod of the cylinder to pass through; the trapezoidal block has a countersunk hole in the center, and the top of the piston rod and the countersunk hole of the trapezoidal block are connected by screws.

4. The positioning and clamping device according to claim 1, characterized in that, The stop block includes a platform portion, and a first step portion is provided on the outer side of the platform portion. After the workpiece is placed on the upper surface of the platform portion, the first step portion and the wedge block cooperate to clamp the workpiece.

5. The positioning and clamping device according to claim 4, characterized in that, The platform section has a second step that is recessed downwards on its inner side, and the height of the second step is lower than the height of the clamping seat.

6. The positioning and clamping device according to claim 1, characterized in that, The trapezoidal block is in the shape of an isosceles trapezoid.

7. The positioning and clamping device according to any one of claims 1 to 6, characterized in that, The bottom of the worktable is provided with a positioning block, and the positioning block is provided with a plurality of positioning pins. A second through hole is provided on the worktable for the positioning pins to pass through. A third through hole is provided in the center of the positioning block, and the piston rod of the cylinder passes through the third through hole. A retaining ring is provided at the bottom end of the piston rod for pushing the positioning block. A spring is provided between the worktable and the positioning block.

8. The positioning and clamping device according to claim 7, characterized in that, Two fourth through holes are symmetrically opened on the positioning block, and a guide sleeve is fixedly connected in the fourth through hole; a guide post is provided at the corresponding position on the bottom of the worktable, and the guide post and the guide sleeve are slidably connected; the spring is sleeved outside the guide post and is located between the worktable and the guide sleeve.

9. The positioning and clamping device according to claim 7, characterized in that, Several columns are provided between the workbench and the cylinder, and the positioning block is provided with a sliding groove that cooperates with the columns.

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