Automatic clamping device of numerical control milling machine

Abstract

The utility model discloses an automatic clamping device of a numerical control milling machine. The automatic clamping device comprises a large bottom plate, a front-end material conveying mechanism, a left-end clamping mechanism, a rear-end material pushing mechanism and a right-end jacking mechanism, the front-end material conveying mechanism comprises a rodless air cylinder with a material conveying disc arranged on the upper portion. The rear-end material pushing mechanism comprises a material pushing air cylinder connected with the rodless air cylinder; the right end jacking mechanism comprises a jacking air cylinder connected with a jacking block, and a sliding groove in the jacking block is connected with the material conveying disc. The left end clamping mechanism comprises a T-shaped block, a clamping block and a pull rod. The T-shaped block is connected with the sliding groove. The other end of the pull rod is hinged with the T-shaped block; the clamping block is connected with the pull rod through the sliding block which is connected with the inner end of the extension spring, and the outer end of the extension spring is connected with the spring fixing column. The front-end material conveying mechanism, the left-end clamping mechanism, the rear-end material pushing mechanism and the right-end jacking mechanism which are distributed in a cross mode are used for achieving front-back and left-right movement of a blank, so that the four sides of the blank are fixed, displacement is avoided in the machining process, and a guarantee is provided for machining precision.

Description

Technical Field

[0001] The utility model relates to the technical field of numerical control milling machines, in particular to an automatic clamping device for numerical control milling machines. Background Art

[0002] Milling machine fixtures are mainly used to process planes, grooves, splines and various molding surfaces on parts. They are one of the most commonly used fixtures. They are mainly composed of positioning devices, clamping devices, clamping bodies, connecting components, and tool setting components. During milling, the cutting force is large, and it is intermittent cutting, resulting in large vibrations. Therefore, the clamping force requirements of milling machine fixtures are large, and the fixture rigidity and strength requirements are relatively high. The existing milling machine fixture, such as the Chinese utility model patent with authorization announcement number CN218225666U, records a workpiece clamping structure for a milling machine workbench, including a milling machine workbench body, fixed vertical plates are welded at both ends of the upper surface of the milling machine workbench body, a hydraulic mechanism is fixedly installed on the inner side of the fixed vertical plate, a clamping protection mechanism is detachably connected to the inner surface of the hydraulic mechanism, and a symmetrically arranged sliding groove is opened on the upper surface of the milling machine workbench body, and the hydraulic mechanism includes a hydraulic cylinder and an L-shaped clamping plate; the utility model cooperates with the hydraulic cylinder and the L-shaped clamping plate to push the clamping protection mechanism to move and quickly clamp the workpiece, assist in the overall processing, and make the clamping process more time-saving and labor-saving, and cooperate with the L-shaped design of the L-shaped clamping plate to limit the position of the workpiece, so that the workpiece is easier to be positioned in a suitable position during processing, thereby improving the utilization efficiency of the device. The above scheme only has two-side positioning, the clamping force is insufficient, and it is easy to cause displacement, resulting in insufficient processing accuracy. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an automatic clamping device for a numerically controlled milling machine which can clamp on multiple surfaces and ensure the consistent positioning of each loading.

[0004] In order to solve the above technical problems, the technical solutions adopted by the utility model are as follows:

[0005] The automatic clamping device of a CNC milling machine comprises a large bottom plate connected to a milling machine worktable, and a front-end material transport mechanism, a left-end clamping mechanism, a rear-end material pushing mechanism and a right-end tightening mechanism which are arranged in a cross shape;

[0006] The front-end material transport mechanism comprises a rodless cylinder mounted on a large base plate, and a material transport tray is provided on a slideway on the upper part of the rodless cylinder to drive the material transport tray to move forward and backward;

[0007] The rear end pushing mechanism comprises a pushing cylinder mounted on a pushing support block, the pushing cylinder is connected to the rear end of the rodless cylinder through a connecting block, and the cylinder support block is slidably connected to a linear guide rod fixed to the large bottom plate and arranged front and rear so as to realize that the rodless cylinder drives the pushing cylinder to move forward and backward;

[0008] The right-end tightening mechanism includes a tightening cylinder installed on the tightening support block, the right end of the tightening cylinder is connected to the tightening block, and a slide groove is provided on the tightening block. The slide groove is slidably connected with the slider on the right side of the material transport tray to realize the locking of the material transport tray and the tightening block and realize the tightening cylinder driving the material transport tray to move left and right;

[0009] The left-end clamping mechanism includes a T-block, a pair of clamping blocks arranged front and back, and a pull rod. The lower end of the T-block is slidably connected to a slide groove arranged on the large base plate in the left and right directions; one end of the pull rod is hinged to the clamping block, and the other end is hinged to the T-block to realize the opening and closing of the clamping block when the T-block moves left and right; the clamping block is connected to the pull rod through a slider, the slider is connected to the inner end of the tension spring, and the outer end of the tension spring is connected to the spring fixing column fixed on the large base plate.

[0010] Preferably, in order to make the clamping jaws of the two clamping blocks open and close more smoothly, the left end clamping mechanism also includes a base fixed on the large base plate, with slide rails on the left and right sides of the base, and a pull rod is arranged on the base, and the slide grooves on both sides of the clamping blocks are movably connected to the slide rails of the base.

[0011] Preferably, slide rails are arranged on the front and rear sides of the slide table of the rodless cylinder, and slide grooves arranged on the front and rear sides of the material transport tray are slidably connected to the slide rails of the slide table.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] 1. The blank on the transport plate is moved forward, backward, left and right by using the front-end transport mechanism, the left-end clamping mechanism, the rear-end push mechanism and the right-end clamping mechanism that are distributed in a cross shape, so that the blank is fixed between the T-block, the two clamping blocks and the clamping block during processing, that is, the four sides of the blank are fixed, and there is no displacement during processing, which provides guarantee for the processing accuracy.

[0014] 2. The driving force of the utility model is the cylinder. Only by setting the stroke properly can the positioning of the blank be guaranteed, the positioning consistency of the blank be ensured, and the accuracy of the processing position be ensured.

[0015] 3. The T-block and two clamping blocks of the left-end clamping mechanism are linkage mechanisms. The clamping degree is controlled by the clamping cylinder, which has good stability and is adjustable, further ensuring the clamping strength of the blank. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0017] Figure 2 It is a top view of the utility model.

[0018] Reference numerals:

[0019] 1. Front-end material transport mechanism, 11. Rodless cylinder, 12. Material transport tray;

[0020] 2. Clamping mechanism at the left end, 21. T-block, 22. Clamping block, 23. Pull rod, 24. Extension spring, 25. Spring fixing column;

[0021] 3. rear end pushing mechanism, 31. pushing support block, 32. pushing cylinder, 33. connecting block, 34. linear guide rod;

[0022] 4. right end tightening mechanism, 41. tightening support block, 42. tightening cylinder, 43. tightening block;

[0023] 5. Large base plate. DETAILED DESCRIPTION

[0024] In order to make the purpose and advantages of the utility model more clear, the utility model is described in detail below with reference to the accompanying drawings and embodiments.

[0025] like Figure 1 , 2 As shown, the utility model discloses an automatic clamping device for a CNC milling machine, comprising a large base plate 5 connected to a milling machine worktable, and a front end material transport mechanism 1, a left end clamping mechanism 2, a rear end material pushing mechanism 3 and a right end tightening mechanism 4 which are distributed in a cross shape. The front-end material transport mechanism 1 can push the transport tray 12 to the discharge port of the feeding mechanism of the milling machine and transport the blank to the transport tray 12. After receiving the blank, the front-end material transport mechanism 1 transports the blank to the right-end clamping mechanism 4, and the transport tray 12 is clamped with the right-end clamping mechanism 4, and the right-end clamping mechanism 4 pushes the transport tray 12 to move left to the left-end clamping mechanism 2. After it is in place, the left-end clamping mechanism 2 and the right-end clamping mechanism 4 jointly clamp the blank on the transport tray 12, and the milling machine processes the blank; after the processing is completed, the right-end clamping mechanism 4 retreats, driving the transport tray 12 to move right, and arrives at the front-end material transport mechanism 1, and the front-end material transport machine moves forward to bring the transport tray 12, the blank on the transport tray 12, and the rear-end pushing mechanism 3 to the discharge port of the feeding mechanism close to the milling machine. At this time, the rear-end pushing mechanism 3 moves forward to push the processed blank (workpiece) onto the feeding mechanism, completing a processing process.

[0026] The front-end material transport mechanism 1 includes a rodless cylinder 11 and a material transport tray 12. The rodless cylinder 11 is installed on the large base plate 5. The material transport tray 12 is arranged on the slide at the upper end of the rodless cylinder 11. The rodless cylinder 11 drives the material transport tray 12 to move forward and backward, so that the blank on the material transport tray 12 is transferred from the feeding mechanism of the milling machine to the automatic clamping device. The rear end of the slide of the rodless cylinder 11 is connected to the rear end material pushing mechanism 3 through the connecting block 33, so that the rodless cylinder 11 drives the pushing cylinder 32 of the rear end material pushing mechanism 3 to move forward and backward. Slide rails are arranged on the front and rear sides of the slide of the rodless cylinder 11, and the slide grooves arranged on the front and rear sides of the material transport tray 12 are slidably connected with the slide rails of the slide, so that the material transport tray 12 can move left and right along the slide rails under the push of the tightening cylinder 42, and will not deviate from the position, so that the positioning is better.

[0027] The rear end pushing mechanism 3 includes a linear guide rod 34, a pushing support block 31 and a pushing cylinder 32. The linear guide rod 34 is arranged front and back and installed on the large base plate 5. The pushing support block 31 is two blocks arranged front and back. The lower part of the pushing support block 31 is a slide groove and is slidably connected to the linear guide rod 34. The pushing cylinder 32 is installed on the pushing support block 31, and the pushing cylinder 32 is connected to the rear end of the rodless cylinder 11 through the connecting block 33, so that when the rodless cylinder 11 moves back and forth, it drives the pushing cylinder 32 to move back and forth.

[0028] The right end tightening mechanism 4 includes a tightening support block 41 and a tightening cylinder 42. The tightening support block 41 is a pair of blocks arranged on the left and right sides. The tightening cylinder 42 is installed on the tightening support block 41 in the left and right directions. The right end of the tightening cylinder 42 is connected to the tightening block 43. A chute is provided at the lower part of the tightening block 43, and the chute is slidably connected to the slider on the right side of the material transport tray 12. When the material transport tray 12 is transported to the front end of the tightening block 43, the slider of the material transport tray 12 slides into the chute of the tightening block 43, and the material transport tray 12 is locked with the tightening block 43 to realize that the tightening cylinder 42 drives the material transport tray 12 to move left and right.

[0029] The left end clamping mechanism 2 includes a T-block 21, a pair of clamping blocks 22 arranged front and back, and two pull rods 23. The lower end of the T-block 21 is slidably connected to a slide groove arranged on the large bottom plate 5 in the left and right directions, and the T-block 21 can move left and right along the slide groove. The clamping block 22 is connected to the pull rod 23 through a slider, the slider is connected to the inner end of the tension spring 24, and the outer end of the tension spring 24 is connected to the spring fixing column 25 fixed on the large bottom plate 5. The two pull rods 23 are arranged in an eight-shaped shape at the front and rear ends of the T-block 21, one end of the pull rod 23 is hinged to the clamping block 22, and the other end is hinged to the T-block 21. When the T-block 21 moves to the left, the pull rod 23 pulls the clamping block 22 inward to tighten, that is, the clamping opening of the clamping block 22 is closed to clamp the blank, and the tension spring 24 is stretched. After the blank is processed, the tightening cylinder 42 moves to the right, loosening the material transport tray 12, and the tension spring 24 is reset, pulling the clamping block 22 outward, the T-block 21 moves to the right, and the pull rod 23 pulls the clamping block 22 to open outward, that is, the clamping block 22 opens to release the blank, and the tightening cylinder 42 drives the material transport tray 12 to move right to the position of the rodless cylinder 11.

[0030] As a preferred embodiment, the left end clamping mechanism 2 also includes a base fixed on the large base plate 5, with slide rails on the left and right sides of the base, a pull rod 23 is arranged on the base, and the slide grooves on both sides of the clamping block 22 are movably connected to the slide rails of the base.

[0031] The driving forces of the front-end material transport mechanism 1, the left-end clamping mechanism 2, the rear-end material pushing mechanism 3 and the right-end pressing mechanism 4 of the utility model are all cylinders. Only by setting the stroke properly can the positioning of the blank be ensured, the positioning consistency of the blank be ensured, and the accuracy of the processing position be ensured. Of course, the limit switch can be set on the rodless cylinder 11 and the clamping block 22 to play the role of positioning the material transport tray 12.

[0032] The above embodiments are only specific examples for further illustrating the purpose, technical scheme and beneficial effects of the utility model, and the utility model is not limited thereto. Any modification, equivalent replacement, improvement, etc. made within the scope of the disclosure of the utility model are included in the protection scope of the utility model.

Claims

1. Automatic clamping device for CNC milling machine, characterized by: It comprises a large bottom plate (5) connected to the milling machine worktable, and a front end material transport mechanism (1), a left end clamping mechanism (2), a rear end material pushing mechanism (3) and a right end clamping mechanism (4) arranged in a cross shape; The front-end material transport mechanism (1) comprises a rodless cylinder (11) mounted on a large base plate (5), and a material transport tray (12) is provided on a slideway on the upper part of the rodless cylinder (11) to drive the material transport tray (12) to move forward and backward; The rear end pushing mechanism (3) comprises a pushing cylinder (32) mounted on a pushing support block (31), the pushing cylinder (32) being connected to the rear end of the rodless cylinder (11) via a connecting block (33), and the cylinder support block being slidably connected to a linear guide rod (34) fixed to the large base plate (5) and arranged front and rear, so that the rodless cylinder (11) drives the pushing cylinder (32) to move forward and backward; The right end tightening mechanism (4) comprises a tightening cylinder (42) mounted on a tightening support block (41), the right end of the tightening cylinder (42) is connected to a tightening block (43), a slide groove is provided on the tightening block (43), and the slide groove is slidably connected to a slider on the right side of the material transporting tray (12) to realize locking of the material transporting tray (12) and the tightening block (43) and realize that the tightening cylinder (42) drives the material transporting tray (12) to move left and right; The left end clamping mechanism (2) comprises a T-shaped block (21), a pair of clamping blocks (22) arranged front and rear, and a pull rod (23); the lower end of the T-shaped block (21) is slidably connected to a slide groove arranged on the large base plate (5) in the left and right directions; one end of the pull rod (23) is hinged to the clamping block (22), and the other end is hinged to the T-shaped block (21) to realize the opening and closing of the clamping mouth of the clamping block (22) when the T-shaped block (21) moves left and right; the clamping block (22) is connected to the pull rod (23) through a slider, the slider is connected to the inner end of a tension spring (24), and the outer end of the tension spring (24) is connected to a spring fixing column (25) fixed on the large base plate (5).

2. The automatic clamping device for a CNC milling machine according to claim 1, characterized in that: The left end clamping mechanism (2) also includes a base fixed on the large bottom plate (5), with slide rails on the left and right sides of the base, a pull rod (23) arranged on the base, and slide grooves on both sides of the clamping block (22) movably connected to the slide rails of the base.

3. The automatic clamping device for a CNC milling machine according to claim 1, characterized in that: Slide rails are arranged at the front and rear sides of the slide table of the rodless cylinder (11), and slide grooves arranged at the front and rear sides of the material transport tray (12) are slidably connected with the slide rails of the slide table.

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