A positioning device for precision numerical control machine tool machining

Abstract

The present application relates to the field of machine tool positioning accessories, and particularly relates to a precision numerical control machine tool machining positioning device, which comprises a pressing block for extruding the side wall of a workpiece; an extension rod, one end of which is hingedly connected with an upwardly inclined "concave" shaped swing arm via a horizontal hinge shaft, one end of the extension rod is threadedly connected with a shaft rod, and one end of the shaft rod penetrates through the extension rod and is rotationally connected with a wedge-shaped block. The precision numerical control machine tool machining positioning device provided by the present application takes the extension rod as an intermediate component, one end of which is designed with an extrusion structure for the workpiece, and the other end is designed with a convenient and controllable extension rod back-off and reverse stopping structure. The device can satisfy the side fixed position of the workpiece, and can also quickly and widely adjust the distance between the pressing block and the abutment, thereby satisfying the quick machining and positioning requirements of workpieces of different sizes, and effectively solving the problem that the compatibility of the side fixed positioning clamp structure form in the prior art to the size change of the workpiece is very low.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of machine tool positioning accessories, in particular to a precision numerical control machine tool machining positioning device. BACKGROUND

[0002] The side fixed positioning clamp of the numerical control machine tool is a special clamp that is pressed and fixed on the side of the workpiece, which is generally matched with a positioning abutment, and only needs to push and press the workpiece on the positioning abutment through the side fixed positioning clamp, which is very suitable for batch processing scenes that need to frequently load and unload workpieces.

[0003] The existing side fixed positioning clamps mainly have two types, which are habitually called "OK clamp" and "toad clamp" in the industry. The working principles of the two types are the same, that is, by pressing the pressing block along the slope on the base, the pressing block moves in the horizontal direction of the workpiece and in the vertical downward direction, and then after the pressing block abuts against the side wall of the workpiece, the workpiece can be pushed and pressed on the positioning abutment and tightly pressed on the machining table, so as to avoid the workpiece from jumping when subjected to the milling force of the cutter.

[0004] The two types of side fixed positioning clamps described above are widely used and mature, but they are based on the same core working principle and also have similar shortcomings, that is, the horizontal movement distance of the pressing block is very small, generally the horizontal movement distance of the pressing block of the "OK clamp" is calculated in millimeters, and the horizontal movement distance of the pressing block of the "toad clamp" generally does not exceed three centimeters. Obviously, when fixing workpieces of different sizes, if the size of the workpiece changes slightly, the existing side fixed positioning clamps need to be disassembled, moved and reinstalled, and the two common types of side fixed positioning clamps have low compatibility for workpiece size changes. Therefore, in order to solve the above problems, a precision numerical control machine tool machining positioning device with a side fixed but large range and convenient adjustment of the horizontal distance of the pressing block is proposed. SUMMARY

[0005] In view of the above or the problem that the compatibility of the structure of the side fixed positioning clamp for workpiece size changes is low in the prior art, the present application is proposed.

[0006] Therefore, the purpose of the present application is to provide a precision numerical control machine tool machining positioning device.

[0007] To solve the above technical problems, the application provides the following technical scheme: a positioning device for precise numerical control machine tool processing, comprising: a pressing block for extruding the side wall of a workpiece; an extension rod, one end of which is hingedly connected with an upwardly inclined "concave" shaped swing arm, one end of the extension rod is threadedly connected with a shaft, and one end of the shaft penetrates the extension rod and is rotationally connected with a wedge-shaped block, the bottom of the wedge-shaped block is inclined downward and abuts against the middle section of the "concave" shaped swing arm; a ring-shaped support coaxially sleeved with the extension rod, and the ring-shaped support is fixedly arranged on one side of the pressing block and is arranged with a slide block in an annular array about the extension rod, the slide block slides along the axial direction of the extension rod through rollers arranged at equal intervals, and the slide block is provided with an inclined surface at a position corresponding to each roller, the inclined surface is arranged away from the pressing block and is narrower than the outer wall of the extension rod; each roller is provided with a spring strip on both sides for rolling the roller, and the middle part of the spring strip is hingedly connected with the side wall of the slide block; the outer part of the annular array of the slide block is slidably sleeved with a sliding ring, the inner wall of the sliding ring is provided with a "V"-shaped protrusion at a position corresponding to each roller, the top of the "V"-shaped protrusion is slidably connected with the outer wall of the slide block, and the ends of the spring strips on both sides of the roller are slidably connected with the inclined surfaces on both sides of the protrusion at the corresponding position; the ends of the rollers are provided with spring strips, each spring strip is in an obtuse "V" shape, and the "V" shaped corner of the spring strip is bent in an "S" shape, the side walls of the slide block are provided with a movable slot matching the spring strip, and the spring strip is pivotally connected with the movable slot in an "S" shape, and can be deflected in the movable slot; the protrusion is provided with a strip-shaped slot on the inclined surfaces on both sides, and the ends of the two spring strips on both sides of the roller are elastically abutted in the strip-shaped slot on the corresponding side at the limit position of the two sliding directions of the sliding ring.

[0008] As a preferred scheme of the application, the middle section of the swing arm is in the shape of a segmental pipe, and two short columns are slidably connected with the two side edges of the pressing block at the two ends of the segmental pipe, and a spring is abutted between the two short columns.

[0009] As a preferred scheme of the application, the outer wall of the pressing block is provided with a hole on the axis of the short column for pushing and extruding the short column to separate the pressing block and the swing arm.

[0010] As a preferred scheme of the application, the extension rod is made of a circular pipe base material, and a belt-shaped plane parallel to the axis of the extension rod is formed on the outer wall of the extension rod, the planes are arranged in an annular array about the extension rod, the number of the planes is the same as the number of the slide blocks, and the rollers are located between the planes and the inclined surfaces.

[0011] As a preferred scheme of the application for the precision CNC machine tool machining positioning device, wherein: the annular support is provided with an elongated part with a "sector" cross-sectional profile in an annular array about its axis, the slider is inserted between two adjacent elongated parts, one end of the slider abuts against the annular support, and the ends of the elongated parts away from the annular support are screw-fastened with a limiting ring, the limiting ring presses the other end of the slider.

[0012] As a preferred scheme of the application for the precision CNC machine tool machining positioning device, wherein: the bottom of the annular support is fixedly connected with a triangular bottom plate, and each of the three corners of the bottom plate is provided with a bolt for fixation.

[0013] As a preferred scheme of the application for the precision CNC machine tool machining positioning device, wherein: each of the adjacent protrusions is provided with an emptying groove, and the sliding of the sliding ring away from the pressing block can make the end of the elastic strip on the side of the pressing block hang in the emptying groove.

[0014] As a preferred scheme of the application for the precision CNC machine tool machining positioning device, wherein: the outer peripheral wall of the sliding ring is recessed in the form of an annular groove towards the axis direction, for gripping.

[0015] The precision CNC machine tool machining positioning device of the application has the following beneficial effects: the precision CNC machine tool machining positioning device provided by the application takes an elongated rod as an intermediate component, one end of which is designed with a pressing structure for a workpiece, and the other end is designed with a convenient and controllable elongated rod back-off and reverse stopping structure, which can quickly and widely adjust the distance between the pressing block and the abutment while satisfying the side fixation of the workpiece, and meets the quick machining and positioning requirements of workpieces of different sizes, effectively solving the problem of low compatibility of the side fixed positioning clamp structure form to the size change of the workpiece in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0017] Figure 1 It is a structural schematic view of the precision CNC machine tool machining positioning device.

[0018] Figure 2 It is a structural schematic view of the precision CNC machine tool machining positioning device. Figure 1 It is a structural schematic view of the precision CNC machine tool machining positioning device.

[0019] Figure 3 It is an assembly structure sectional view between the elongated rod and the pressing block. It is a structural schematic view of the precision CNC machine tool machining positioning device.

[0020] Figure 4 This is a schematic diagram of the distribution structure of the slip ring and slider with respect to the extension rod.

[0021] Figure 5 for Figure 4 A cross-sectional view of a local structure.

[0022] Figure 6 for Figure 5 Enlarged view of the structure at point A in the middle.

[0023] Figure 7 for Figure 6 Enlarged view of the structure at point B.

[0024] Figure 8 This is a sectional view of the assembly structure between the bracket, slip ring, and slider.

[0025] In the diagram: 100, pressure block; 101, extension rod; 1011, plane; 102, swing arm; 1021, short column; 1022, spring; 103, shaft; 104, wedge block; 105, slider; 1051, inclined plane; 1052, movable groove; 106, roller; 107, spring bar; 108, slip ring; 1081, protrusion; 1082, strip groove; 1083, clearance groove; 200, annular bracket; 201, extension part; 202, limiting ring; 203, base plate. Detailed Implementation

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] Example, refer to Figures 1-8 This embodiment provides a positioning device for precision CNC machine tool processing, which retains the side-fixed fixing form, while also allowing for a wide range of adjustment of the horizontal distance of the pressure block 100, thus achieving the effect of the positioning device being able to quickly and widely accommodate workpieces of different sizes.

[0028] The invention comprises a pressing block 100 and an extension rod 101 for pressing the sidewall of a workpiece, an obliquely upward "concave" shaped swing arm 102 is hinged to the horizontal hinge shaft at one end of the extension rod 101, a shaft rod 103 is threaded into one end of the extension rod 101, and the other end of the shaft rod 103 penetrates through the extension rod 101 and is rotationally connected with a wedge block 104, the bottom of the wedge block 104 is inclined downward and abuts against the middle segment of the "concave" shape of the swing arm 102; a ring-shaped support 200 coaxially sleeves the extension rod 101, and the ring-shaped support 200 is fixedly assembled with a sliding block 105 in an annular array on one side of the pressing block 100 relative to the extension rod 101, the sliding block 105 slides along the axial direction of the extension rod 101 through equidistantly arranged rollers 106, and the sliding block 105 is provided with an inclined surface 1051 at each roller 106, which is arranged to be narrowed in distance away from the pressing block 100 relative to the outer wall of the extension rod 101; a spring strip 107 is arranged on both sides of each roller 106 for driving the roller 106 to roll, and the middle part of the spring strip 107 is hinged to the sidewall of the sliding block 105; a sliding ring 108 is slidingly sleeved on the outside of the annular array group of the sliding block 105, and the inner wall of the sliding ring 108 is provided with a "V" shaped protrusion 1081 at the position corresponding to each roller 106, the top of the protrusion 1081 is slidingly connected with the outer wall of the sliding block 105, and the ends of the spring strips 107 on both sides of the roller 106 are slidingly abutted against the inclined surfaces of the protrusions 1081 on both sides of the corresponding position.

[0029] Specifically, referring to Figure 8 , the ring-shaped support 200 is provided with an elongated part 201 with a "fan-shaped" cross-sectional profile in an annular array relative to the axis of the ring-shaped support 200, the sliding block 105 is inserted between two adjacent elongated parts 201, one end of the sliding block 105 abuts against the ring-shaped support 200, and the ends of the elongated parts 201 away from the ring-shaped support 200 are screw-fastened with a limiting ring 202, the limiting ring 202 presses the other end of the sliding block 105, referring to Figure 1 and Figure 2 , the bottom of the ring-shaped support 200 is fixedly connected with a triangular bottom plate 203, and the three corners of the bottom plate 203 are provided with bolts for fixation.

[0030] The invention mainly provides a function of large-range and rapid adjustment of the horizontal distance of the pressing block 100 contacting the workpiece, which connects two important structures with the extension rod 101 as the intermediate component, one is the structure of the extension rod 101 at one end for pressing the workpiece, and the other is the structure of the extension rod 101 at the other end for preventing the extension rod 101 from retreating, which only allows the extension rod 101 to slide towards the workpiece, so that the pressing structure is sent to the vicinity of the sidewall of the workpiece, and then the pressing structure is operated to press the sidewall of the workpiece.

[0031] First, the working mode of the pressing structure is specifically described, referring to Figure 1 and Figure 2, along the thread in the extension rod 101 to the workpiece direction into the shaft 103, wedge block 104 due to the ground pressure on the swing arm 102, and with the shaft 103 rotationally connected, so the wedge block 104 does not rotate with the shaft 103 rotation, but along the shaft 103 axis direction in the workpiece moving down to squeeze the swing arm 102, because the swing arm 102 in the initial state is inclined, so the swing arm 102 in the shaft downward deflection between it and the extension rod 101, both can produce horizontal movement, but also can produce vertical downward movement, so the block 100 with the swing arm 102 articulated and resisted the workpiece side wall, at this time meet the general side of the fixed positioning fixture work requirements, the workpiece is pressed on the abutment and the table; can be referred to the structure for, the swing arm 102 "concave" in the middle section of the pipe, its pipe-shaped both ends are respectively with the two sides of the block 100 between the sliding plug-in short column 1021, and the two short column 1021 between the resistance spring 1022, the two sides of the block 100 outer wall on the short column 1021 axis processing hole, used to push the short column 1021 split block 100 and swing arm 102.

[0032] To further illustrate the working way of the structure of the check, to understand the working principle of the structure, can first refer to the working way of one-way bearing, the basic principle is that the rolling friction is brought into the gradually narrowing gap, the gap width changes very small, a small initial friction can make the roller 106 can easily produce strong extrusion force on the wall of the gap, so as to produce enough friction to make the roller 106 stuck in the gap, the present application is based on the above basic working principle, re design a new linear roller 106 check structure, which constitutes the gap has the plane 1011 on the outer wall of the extension rod 101 and the inclined surface 1051 on the slide block 105 adjacent to the plane 1011, reference Figure 1 , and Figure 5 and Figure 6 View, when the extension rod 101 has a tendency to retreat loose to the right side, the extension rod 101 will also have a tendency to drive the roller 106 further into the narrow gap between the inclined surface 1051 and the plane 1011, but, because the slide ring 108 resistance sleeve slide block 105, the slide block 105 resistance roller 106, the roller 106 again resistance extension rod 101, they are rigid contact, no more space for the roller 106 to further into the narrow gap, therefore, the roller 106 can keep stuck in the state between the slide block 105 and the extension rod 101, the extension rod 101 retreat and loose is prevented, in turn, to ensure that the block 100 on the workpiece extrusion force remains stable;

[0033] Not only that, to Figure 4For example, the present application provides four groups of the above-mentioned reverse stopping structure composed of sliders 105 and rollers 106 around the extension rod 101, aiming to improve the upper limit of the pressing block 100 on the workpiece extrusion force of the device, of course, according to the actual needs, it can also be adjusted to other number of groups, the structure is that the extension rod 101 is processed with a flat strip 1011 parallel to the axis of the outer wall of the circular tube base material, and the flat strip 1011 is arranged in a ring shape about the extension rod 101, the number of flat strips 1011 is the same as the number of sliders 105, and the rollers 106 are located between the flat strips 1011 and the inclined surfaces 1051.

[0034] The above-mentioned reverse stopping structure for preventing the extension rod 101 from backtracking to cause the pressing block 100 to loosen, relative to the approximate prior art (such as one-way bearing), also provides a reverse stopping control function that the prior art does not have, in short, when fixing a small size workpiece to a large size workpiece, the pressing block 100 and the extension rod 101 need to back off to provide more assembly space, at this time, the above-mentioned reverse stopping function needs to be unlocked, and is quickly unlocked, and after unlocking, it can be quickly re-enabled when needed, which mainly involves the slip ring 108 and the elastic strip 107 on the slider 105;

[0035] The elastic strip 107 needs to be deflected when one end of the elastic strip 107 is subjected to extrusion, the present application provides a specific example of the structure of the elastic strip 107, which is that the two ends of the roller 106 are distributed with elastic strips 107, a single elastic strip 107 is in an obtuse angle "V" shape, and the "V" shape of the elastic strip 107 is bent in an "S" shape, both sides of the slider 105 are provided with a movable groove 1052 matched with the elastic strip 107, the elastic strip 107 is sleeved with the movable groove 1052 as the shaft with an "S" shape, and can be deflected in the movable groove 1052, the protrusion 1081 is provided with a strip-shaped groove 1082 on the two inclined surfaces, the ends of the two elastic strips 107 on both sides of the roller 106 correspond to the limit positions of the two sliding directions of the slip ring 108, and can be elastically contacted in the strip-shaped groove 1082 on the corresponding side, and the adjacent protrusions 1081 are provided with an empty slot 1083, and the sliding of the slip ring 108 away from the pressing block 100 can make the end of the elastic strip 107 on one side of the roller 106 suspended in the empty slot 1083.

[0036] But before explaining the working principle, first of all, it should be pointed out that, with reference to Figure 7, in the condition that the reverse function is enabled, the top end of the elastic strip 107 on the left side of the roller 106 is pressed by the inclined surface of the protrusion 1081 of the slip ring 108, the pressing force makes the elastic strip 107 deflect, so that the bottom end of the elastic strip 107 pushes the roller 106 to the deep part of the narrow gap between the inclined surface 1051 and the plane 1011, which makes the roller 106 always in good contact with the inclined surface 1051 and the plane 1011 when the reverse function is enabled, which is a prerequisite for zero delay triggering of the reverse function, in this state, the elastic strip 107 on the right side of the roller 106 does not produce force on the roller 106 because the top is in the air slot 1083, and the top end of the elastic strip 107 on the left side of the roller 106 is in contact with the strip-shaped slot 1082 of the left inclined surface of the protrusion 1081, which can provide a static torque for the slip ring 108 to avoid the contact between the roller 106 and the inclined surface 1051 and the plane 1011 caused by the rollback of the slip ring 108.

[0037] Reference Figure 1 , and Figure 5 , Figure 6 and Figure 7 , the operation principle of the slip ring 108 is described, when the slip ring 108 is pushed to the right, the right inclined surface of the protrusion 1081 will press the elastic strip 107 on the right side of the roller 106, and until the end of the elastic strip 107 slides into the strip-shaped slot 1082 of the right inclined surface of the protrusion 1081, the end of the elastic strip 107 adjacent to the roller 106 will push the roller 106 to the opening direction of the gap between the inclined surface 1051 and the plane 1011, so as to keep the roller 106 not in contact with the inclined surface 1051 and the plane 1011 at the same time, at this time, the extension rod 101 can be freely pulled and slid forward and backward, in this state, the elastic strip 107 on the left side of the roller 106 does not produce force on the roller 106 because the top is in the air slot 1083, to enable the reverse function again, refer to the previous left push of the slip ring 108, the outer wall of the slip ring 108 is recessed to the axis direction to form a ring-shaped groove, which is convenient for gripping operation.

[0038] In summary, the precision numerical control machine tool machining positioning device provided by the present application takes the extension rod 101 as an intermediate part, one end of which is designed with a pressing structure for the workpiece, and the other end is designed with a convenient and controllable extension rod 101 rollback reverse structure, which can quickly and widely adjust the distance between the pressing block 100 and the abutment while satisfying the side fixed position of the workpiece, meeting the rapid machining and positioning needs of workpieces of different sizes, and effectively solving the problem that the compatibility of the side fixed positioning clamp structure form in the prior art to the size change of the workpiece is very low.

[0039] It should be noted that the above examples are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced, without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A precision NC machine tool machining positioning device, characterized by, Include: Briquetting (100) for extruding the side wall of workpiece; The horizontal hinge shaft of one end of the extension rod (101) is hinged with the obliquely upward "concave" shaped swing arm (102), one end of the extension rod (101) is threaded with the shaft rod (103), and one end of the shaft rod (103) penetrates the extension rod (101) and is rotatably connected with the wedge block (104), the bottom of the wedge block (104) is inclined downward and abuts against the "concave" shaped middle segment of the extruding swing arm (102); The annular support (200) coaxially sleeves the extension rod (101), and the annular support (200) is fixedly assembled with the sliding block (105) in an annular array on one side of the briquetting (100) relative to the extension rod (101), the sliding block (105) slides along the axial direction of the extension rod (101) through the equidistantly arranged rollers (106), and the sliding block (105) is provided with an inclined surface (1051) at each roller (106), which is arranged away from the briquetting (100) relative to the outer wall of the extension rod (101). The two sides of each roller (106) are provided with elastic strips (107) for driving the rolling thereof, and the middle part of the elastic strip (107) is hinged with the side wall of the sliding block (105), the outer sliding sleeve of the annular array group of the sliding block (105) is provided with a sliding ring (108), the inner wall of the sliding ring (108) is provided with a "V" shaped protrusion (1081) corresponding to the position of each roller (106), the top of the protrusion (1081) is slidingly connected with the outer wall of the sliding block (105), and the ends of the elastic strips (107) on both sides of the roller (106) are "V" shaped and slidingly abut against the inclined surfaces on both sides of the corresponding protrusion (1081). The two ends of the roller (106) are distributed with elastic strips (107), a single elastic strip (107) is obtuse "V" shaped, and the "V" shaped corner of the elastic strip (107) is "S" shaped circular arc bending, the two side walls of the sliding block (105) are provided with movable grooves (1052) matching the elastic strips (107), and the elastic strip (107) is bent with the movable groove (1052) in the structure of the sleeve, which can be deflected in the movable groove (1052) within a limited range. The protrusion (1081) is provided with a strip-shaped groove (1082) on the inclined surfaces on both sides thereof, and the ends of the two elastic strips (107) on both sides of the roller (106) correspond to the limit positions of the two sliding directions of the sliding ring (108), and can be elastically abutted in the strip-shaped grooves (1082) on the corresponding sides.

2. The precision NC machine tool machining positioning device according to claim 1, characterized in that: The "concave" shaped middle segment of the swing arm (102) is in the shape of a segment circular pipe, and the two ends of the circular pipe are slidingly connected with the short columns (1021) between the two side edges of the briquetting (100), and the two short columns (1021) abut against the spring (1022).

3. The precision CNC machine tool machining positioning device of claim 2, wherein: The outer wall of the briquetting (100) is provided with a hole on the axis of the short column (1021) for pushing the short column (1021) to disassemble the briquetting (100) and the swing arm (102).

4. The precision CNC machine tool machining positioning device of claim 1, wherein: The elongated rod (101) is made of a circular tube base material, and parallel to the axis of the elongated rod (101), a strip-shaped plane (1011) is processed on the outer wall, and the planes (1011) are arranged in a ring array about the elongated rod (101), the number of the planes (1011) is the same as the number of the sliders (105), and the rollers (106) are located between the planes (1011) and the inclined surfaces (1051).

5. The precision CNC machine tool machining positioning device of claim 1, wherein: The annular support (200) is provided with elongated portions (201) with a "fan-shaped" cross-sectional profile in a ring array about the axis thereof, the sliders (105) are inserted between two adjacent elongated portions (201), one end of the slider (105) abuts against the annular support (200), and the ends of the elongated portions (201) away from the annular support (200) are screw-fastened with limiting rings (202), the limiting rings (202) press the other end of the slider (105).

6. The precision CNC machine tool machining positioning device of claim 5, wherein: The bottom of the annular support (200) is fixedly connected with a triangular bottom plate (203), and each of the three corners of the bottom plate (203) is provided with a bolt for fixation.

7. The precision CNC machine tool machining positioning device of claim 1, wherein: Each of the adjacent protrusions (1081) is provided with an emptying groove (1083), and sliding of the sliding ring (108) away from the pressing block (100) can make the end of the elastic strip (107) on the side of the pressing block (100) hang in the emptying groove (1083).

8. The precision CNC machine tool machining positioning apparatus of claim 1, wherein: The outer peripheral wall of the sliding ring (108) is recessed in a ring-shaped groove about the axis thereof, for gripping.

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