Four-axis rotary table rotary type back-pulling clamp

Abstract

The utility model discloses a four-axis rotary table rotary type back-pulling clamp which comprises a back-pulling air cylinder installed in the center of a four-axis rotary table, the tail end of the back-pulling air cylinder is connected with an installation disc, the installation disc is connected with a positioning disc, and the output end of the back-pulling air cylinder penetrates through the installation disc and the positioning disc. An expansion sleeve structure is arranged in the center of the positioning disc and comprises a hollow column, a cylindrical ejector block is arranged in the hollow column, a plurality of T-shaped inclined grooves are evenly formed in the end of the cylindrical ejector block, wedge-shaped faces are arranged on the cylindrical ejector block outside the T-shaped inclined grooves, ejector columns are clamped in the T-shaped inclined grooves, clamping grooves are oppositely formed in the side walls of the ejector columns, and clamping grooves are formed in the clamping grooves. According to the device, the post-pulling air cylinder pushes the cylindrical block, the T-shaped inclined groove of the cylindrical block can drive the jacking column to extend out of the inner wall of a jacking column workpiece, tensioning is achieved, the workpiece can be pressed through pushing of the oil cylinder by the four-axis tailstock on the opposite side, the bearing is arranged, the workpiece rotates, and machining is convenient.

Description

Technical Field

[0001] The utility model relates to the field of machine tool fixtures, in particular to a four-axis turntable rotary back-pull fixture. Background Art

[0002] During machine tool processing, Figure 1 The part shell shown is a thin-walled part with a hollow cylindrical structure. When positioning the workpiece, it is difficult to achieve it by clamping due to its thin outer part. It is usually positioned by internal expansion. And because it is a four-axis machining, it is necessary to realize the rotation of the product, but only internal positioning is performed. Moreover, the part shell is not a completely symmetrical structure. When rotating, it will offset and need to be tightened at the other end. The traditional ejector mechanism cannot adjust the distance from the main axis. After a workpiece of one specification is completed, the fixture structure needs to be adjusted to process workpieces of different specifications. The efficiency is low and the positioning effect is poor. In addition, since the workpiece is an asymmetric structure, it needs to be positioned in a fixed position before tightening. Utility Model Content

[0003] In order to solve the above technical problems, the utility model discloses a four-axis turntable rotary back-pull clamp, comprising a back-pull cylinder installed at the center of the four-axis turntable, the end of the back-pull cylinder is connected to a mounting plate, the mounting plate is connected to a positioning plate, and the output end of the back-pull cylinder passes through the mounting plate and the positioning plate;

[0004] An expansion sleeve structure is provided at the center of the positioning plate, and the expansion sleeve structure includes a hollow column, a cylindrical top block is provided in the hollow column, and a plurality of T-shaped oblique grooves are evenly provided on the ends of the cylindrical top block. A wedge-shaped surface is provided on the cylindrical top block outside the T-shaped oblique groove, and a top column is clamped in the T-shaped oblique groove. The side walls of the top column are relatively provided with clamping grooves, and the clamping grooves are pressed on the wedge-shaped surfaces. The cylindrical top block moves axially along the hollow column, and the top column moves along the wedge-shaped surface. When the top columns move away from each other, the ends extend out of the hollow column.

[0005] Preferably, the end of the top column is provided with a curved surface.

[0006] Preferably, the slot of the columnar top block is arranged obliquely.

[0007] Preferably, a through hole is provided on the side wall of the hollow column, and the end of the top column is aligned with the through hole.

[0008] Preferably, a protrusion is provided in an annular shape on the positioning plate, and the protrusion is used to position the workpiece.

[0009] Preferably, a limiting pressure plate is provided at the end of the hollow cylinder, and the diameter of the positioning plate is larger than the diameter of the hollow cylinder.

[0010] Preferably, a hydraulic positioning pin is provided on the positioning plate, and the hydraulic positioning pin comprises a micro-cylinder, and a pin body is provided at the output end of the micro-cylinder.

[0011] Preferably, it also includes a four-axis tailstock, a positioning cylinder is provided on the four-axis tailstock, the output end of the positioning cylinder passes through the four-axis tailstock and is connected to a connecting sleeve, a bearing is provided between the connecting sleeve and the output end of the positioning cylinder, and a thimble is provided on the connecting sleeve.

[0012] The four-axis turntable rotary back-pull clamp proposed by the utility model has the following beneficial effects: the device pushes the column block through the back-pull cylinder, and the T-shaped inclined groove of the column block can drive the top column to extend outward from the inner wall of the top column workpiece to achieve tensioning, and the workpiece can be pressed by the oil cylinder through the four-axis tailstock on the opposite side, and a bearing is provided, so that the workpiece can be pressed and rotated at the same time, which is convenient for processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for describing the embodiments.

[0014] Figure 1 A three-dimensional image of the workpiece;

[0015] Figure 2 It is a three-dimensional structural schematic diagram of the utility model;

[0016] Figure 3 It is a cross-sectional view of the utility model;

[0017] Figure 4 It is a schematic diagram of the expansion sleeve structure of the utility model;

[0018] Figure 5 It is a schematic diagram of the installation of the columnar top block and the top column of the utility model;

[0019] Among them, 1. pull-back cylinder; 2. four-axis turntable; 3. mounting plate; 4. positioning plate; 5. expansion sleeve structure; 6. hollow cylinder; 7. cylindrical top block; 8. raised part; 9. T-shaped inclined groove; 10. wedge-shaped surface; 11. top column; 12. slot; 13. four-axis tailstock; 14. limit pressure plate; 15. hydraulic positioning pin; 16. positioning cylinder; 17. connecting sleeve; 18. bearing; 19. top block. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0021] like Figure 2 , Figure 3As shown, the utility model discloses a four-axis turntable rotary back-pull fixture, including a back-pull cylinder 1 installed at the center of a four-axis turntable 2. The four-axis turntable 2 is a prior art and can be purchased from Mize (Shanghai) Industrial Co., Ltd. The four-axis turntable can be found on its website, http: / / www.mizecnc.com / ProDetail.aspx?ProId=170&bd_vid=8349155410432077056. The end of the back-pull cylinder 1 is connected to a mounting plate 3, which is fixed around the output end of the turntable. The mounting plate 3 is connected to a positioning plate 4, and the output end of the back-pull cylinder 1 passes through the mounting plate 3 and the positioning plate 4;

[0022] The center of the positioning plate 4 is provided with an expansion sleeve structure 5. Figure 4 As shown, the expansion sleeve structure 5 includes a hollow column 6, the end of the hollow column 6 is a closed structure, and a limiting pressure plate 14 is provided at the end of the hollow column 6. The diameter of the limiting pressure plate 14 is larger than the diameter of the hollow column 6. When the workpiece is sleeved on the positioning column, the limiting pressure plate 14 at the end performs preliminary positioning on the inner diameter of the product. The diameter of the limiting pressure plate 14 is larger than the hollow column 6, which helps to prevent the inner top column 11 from interfering with the workpiece;

[0023] like Figure 5 As shown, a columnar top block 7 is provided in the hollow column 6, and a plurality of T-shaped inclined grooves 9 are evenly provided at the end of the columnar top block 7. The vertical portion of the T-shaped inclined groove 9 is inclined from the direction close to the center of the columnar top block 7 to the side wall of the columnar top block 7. A wedge-shaped surface 10 is provided on the columnar top block 7 outside the T-shaped inclined groove 9. A top column 11 is clamped in the T-shaped inclined groove 9. A clamping groove 12 is relatively provided on the side wall of the top column 11. The clamping groove 12 is pressed on the wedge-shaped surface 10. The columnar top block 7 The top column 11 moves axially along the hollow column 6, and moves along the wedge-shaped surface 10. In addition, a through hole is provided on the side wall of the hollow column 6, and the end of the top column 11 is aligned with the through hole. The top column 11 is located in the through hole, so it is positioned in the axial direction. When the cylindrical top block 7 is pushed, the wedge-shaped surface 10 pushes the cylindrical positioning to extend out of the through hole. When the top columns 11 move away from each other, the ends extend out of the hollow column 6. The end of the top column 11 is provided with an arc surface to realize the tensioning positioning of the outer workpiece.

[0024] It should be noted that a raised portion 8 is provided in an annular shape on the positioning disk 4, and the raised portion 8 is used to position the workpiece. The mouth of the workpiece is pressed on the raised portion 8, and in order to ensure that the installation direction of the workpiece is correct, a hydraulic positioning pin 15 is provided on the positioning disk 4, and the hydraulic positioning pin 15 includes a micro-cylinder, and a pin body is provided at the output end of the micro-cylinder. When the workpiece is sleeved on the hollow column 6, the workpiece is rotated, and the hole on the edge of the workpiece is aligned with the hydraulic positioning pin 15. The positioning pin is pushed out by the micro-cylinder to achieve preliminary positioning and determine the installation direction. Then, it is pushed out by the aforementioned back-pull cylinder 1 to push the columnar top block 7 to move in the hollow column 6, thereby driving the top column 11 to extend to achieve tension. In order to increase the positioning stability, A four-axis tailstock 13 is arranged at a relative position of the expansion sleeve structure 5, and a positioning cylinder 16 is arranged on the four-axis tailstock. The output end of the positioning cylinder 16 passes through the four-axis tailstock and is connected with a connecting sleeve 17. A bearing 18 is arranged between the connecting sleeve 17 and the output end of the positioning cylinder 16. A thimble 19 is arranged on the connecting sleeve 17. The positioning cylinder 16 extends out to push the thimble 19 to press the workpiece tightly to achieve axial clamping. The thimble 19 with a telescopically adjustable position can be suitable for workpieces of different specifications. At the same time, after the rotating table is controlled to rotate, since the bearing 18 is arranged between the connecting sleeve 17 and the output end of the cylinder, the function of clamping can be achieved without affecting the rotation, thereby improving the positioning accuracy and thus improving the processing accuracy.

[0025] After the processing is completed, the oil cylinder retreats, the ejector pin 19 is separated from the workpiece, and the cylinder 1 is deflated. At this time, the ejector pin 19 has no pressure to push, which reduces the tension effect on the workpiece. The workpiece can be unloaded by pulling it, and disassembly and assembly are convenient.

Claims

1. A four-axis turntable rotary back-pull fixture, characterized in that: It includes a back-pull cylinder installed at the center of the four-axis turntable, the end of the back-pull cylinder is connected to a mounting plate, the mounting plate is connected to a positioning plate, and the output end of the back-pull cylinder passes through the mounting plate and the positioning plate; An expansion sleeve structure is provided at the center of the positioning plate, and the expansion sleeve structure includes a hollow column, a cylindrical top block is provided in the hollow column, and a plurality of T-shaped oblique grooves are evenly provided on the ends of the cylindrical top block. A wedge-shaped surface is provided on the cylindrical top block outside the T-shaped oblique groove, and a top column is clamped in the T-shaped oblique groove. The side walls of the top column are relatively provided with clamping grooves, and the clamping grooves are pressed on the wedge-shaped surfaces. The cylindrical top block moves axially along the hollow column, and the top column moves along the wedge-shaped surface. When the top columns move away from each other, the ends extend out of the hollow column.

2. The four-axis turntable rotary back-pull fixture according to claim 1 is characterized in that: The end of the top column is provided with an arc surface.

3. The four-axis turntable rotary back-pull fixture according to claim 1 is characterized in that: The clamping groove of the columnar top block is arranged obliquely.

4. The four-axis turntable rotary back-pull fixture according to claim 1 is characterized in that: The side wall of the hollow column is provided with a through hole, and the end of the top column is aligned with the through hole.

5. The four-axis turntable rotary back-pull fixture according to claim 1 is characterized in that: The positioning plate is provided with a protrusion in an annular shape, and the protrusion is used for positioning the workpiece.

6. The four-axis turntable rotary back-pull fixture according to claim 1 is characterized in that: A limiting pressure plate is provided at the end of the hollow cylinder, and the diameter of the positioning plate is larger than the diameter of the hollow cylinder.

7. The four-axis turntable rotary back-pull fixture according to claim 1 is characterized in that: The positioning plate is provided with a hydraulic positioning pin, and the hydraulic positioning pin comprises a micro-cylinder, and an output end of the micro-cylinder is provided with a pin body.

8. The four-axis turntable rotary back-pull fixture according to claim 1 is characterized in that: It also includes a four-axis tailstock, which is provided with a positioning cylinder. The output end of the positioning cylinder passes through the four-axis tailstock and is connected with a connecting sleeve. A bearing is provided between the connecting sleeve and the output end of the positioning cylinder, and a thimble is provided on the connecting sleeve.

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