Inner supporting type limiting clamp for lathe

Abstract

The utility model discloses an inner support style limit fixture for lathe, including fixture main part, locating piece, product fixing piece, pop rivet and pull rod, fixture main part is connected with outside lathe, pull rod is fixed connection in one end of fixture main part, locating piece is fixed connection in the middle of fixture main part far away from pull rod one end, the pull rod is fixed in the middle of fixture main part far away from pull rod. The product fixing piece is arranged at the end, away from the clamp body, of the positioning piece. The blind rivet is located at the end, away from the positioning piece, of the product fixing piece. Four open grooves are formed in the surface of the product fixing part at equal intervals, four groups of cavities are formed in the surface of the product fixing part at equal intervals, two springs are symmetrically and fixedly connected to the ends, away from the outer side end of the product fixing part, of the four groups of cavities, and an ejection block is fixedly connected to the end, facing the outer side of the product fixing part, of each spring. The ejection block is pushed through the spring to pre-fix the workpiece arranged on the clamp in a sleeving mode, the situation that the workpiece rotates before being fixed by the clamp, and consequently the workpiece falls off from the clamp is avoided, and the safety risk is reduced.

Description

Technical Field

[0001] This utility model relates to the field of fixture technology, specifically to an internal support type limiting fixture for lathes. Background Technology

[0002] Lathe fixtures are used on a lathe to machine the internal and external surfaces of a workpiece, as well as its end faces. Most lathe fixtures are mounted on the spindle; a few are mounted on the saddle or bed. Internal support fixtures are a type of lathe fixture that primarily secures the workpiece by providing internal support.

[0003] Current internal support fixtures can secure workpieces by expanding the product fixing components, and can hold workpieces of various inner diameters. For example, patent publication number "CN217192623U," entitled "An Internal Support Limiting Fixture for a Lathe," uses the wide end of a pull stud to internally support the product fixing components and lock the external workpiece to be processed. However, when the workpiece is placed on the fixture, the product fixing components cannot immediately provide internal support fixation. Furthermore, the workpiece's shape is diverse, and its center of gravity may not be on the fixture, causing the workpiece to rotate after the fixture is inserted. This could lead to the workpiece falling off the fixture, posing a safety hazard. Utility Model Content

[0004] The purpose of this utility model is to provide an internal support type limiting fixture for lathes, which can pre-fix the workpiece after it is placed on the fixture, to prevent the workpiece from shaking and falling off the fixture, thus eliminating safety hazards.

[0005] To achieve the above objectives, a lathe internal support type limiting fixture is provided, comprising a fixture body, a positioning element, a product fixing element, a pull stud, and a pull rod. The fixture body is connected to an external lathe. The pull rod is fixedly connected to one end of the fixture body, and the pull rod and the external machine tool are located on the same side. The positioning element is fixedly connected to the middle of the end of the fixture body away from the pull rod. The product fixing element is located at the end of the positioning element away from the fixture body. The pull stud has a cylindrical structure, and one end of the pull stud has a frustum-shaped block, the small end of which is fixedly connected to the pull stud. The pull stud is located on the product fixing element away from the positioning element. One end of the pull stud, away from the frustum-shaped block, sequentially passes through the middle of the product fixing component, the positioning component, the clamp body, and the pull rod, and the pull stud is fixedly connected to the pull rod. The surface of the product fixing component has four equally spaced slots, and the end of each slot away from the positioning component passes through the product fixing component, allowing it to open and close. The surface of the product fixing component has four equally spaced chambers, and two springs are symmetrically fixedly connected to the ends of the four chambers away from the outer side of the product fixing component. An ejector block is fixedly connected to the end of each spring facing the outer side of the product fixing component, and the outer end of the ejector block is slidably connected to the side wall of the chamber. This design allows for pre-fixing of the workpiece after it is placed on the clamp, preventing the workpiece from shaking and falling off the clamp, thus eliminating safety hazards.

[0006] According to the aforementioned internal support type limiting fixture for lathes, the end of the ejector block away from the positioning member and the end of the ejector block away from the spring are provided with inclined surfaces. The inclined surfaces on the ejector block prevent the workpiece from colliding with the ejector block when passing through its surface.

[0007] According to the aforementioned internal support type limiting fixture for a lathe, a limiting structure is provided on the opening side of the chamber, and the limiting structure limits the ejector block. The limiting structure limits the ejector block to prevent the spring from pushing the ejector block away from the chamber.

[0008] According to the aforementioned internal support type limiting fixture for lathes, four additional blocks are slidably connected to the outer end of the product fixing component, and the four additional blocks are respectively located between two adjacent slots. The surface of the product fixing component has threaded holes, and a bolt is provided at the end of each additional block away from the product fixing component. The bolt passes through the additional block and is rotatably connected to it. The end of the bolt passing through the additional block extends into the threaded hole, and the bolt is threadedly connected to the threaded hole. The additional blocks are used to increase the outer diameter of the product fixing component, thereby fixing workpieces with larger inner diameters and improving the applicability of the fixture.

[0009] According to the aforementioned internal support type limiting fixture for lathes, four T-shaped grooves are equidistantly formed on the surface of the product fixing component, with one end of each groove penetrating the end of the product fixing component away from the positioning component. Each of the four sets of grooves consists of two sections, and the two sections in each set are symmetrical about the cavity as an axis of symmetry. A T-shaped slider is fixedly connected to the middle of one end of the additional block, and the slider is located on the same side as the product fixing component. The slider is situated within the groove, and its outer end is slidably connected to the sidewall of the groove. The arc length of the additional block on the same side of the product fixing component is the same as the arc length of the four arc surfaces equidistantly divided by the four grooves on the outer end of the product fixing component. The slider and groove cooperate to limit the movement of the additional block, facilitating its installation. Furthermore, the arc length of the additional block being the same as the arc length of the product fixing component surface allows the ejector block to be pushed into the cavity by the additional block. A spring pushes the additional block, preventing the bolts from loosening.

[0010] According to the aforementioned internal support type limiting fixture for lathes, the outer end of the additional block has a countersunk hole, and the head of the bolt is located in the countersunk hole. The countersunk hole hides the head of the bolt, so that there is no protrusion on the surface of the additional block, thus avoiding damage to the workpiece being fixed.

[0011] According to the aforementioned internal support type limiting fixture for lathes, the product fixing member has a sloping surface at the middle of its end away from the positioning member, which fits against the side of the frustum-shaped block at one end of the pull stud. The sloping surface that fits against the pull stud reduces the friction between the product fixing member and the pull stud when the product fixing member opens.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. By pushing the ejector block with a spring, a pushing force is applied to the inner wall of the workpiece when it is placed on the fixture, thereby pre-fixing the workpiece and preventing it from rotating before being fixed by the fixture, which would cause the workpiece to fall off the fixture and reduce safety risks.

[0014] 2. The slider, in conjunction with the groove, guides the additional block and fixes it to the product fixture with bolts, increasing the outer diameter of the product fixture to fix the workpiece with a larger inner diameter. The spring pushes the ejector block to apply a force to the additional block in the opposite direction to the bolt, preventing the bolt from loosening.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0017] Figure 1 This is a perspective view of an internal support type limiting fixture for a lathe according to the present invention;

[0018] Figure 2 This is a cross-sectional view of an internal support type limiting fixture for a lathe according to the present invention;

[0019] Figure 3 This is a diagram showing the fit between the product fixing component and the additional block of an internal support type limiting fixture for lathes according to this utility model.

[0020] Figure 4 A perspective view of the product fixing component of the internal support type limiting fixture for lathes according to this utility model after removing the additional block;

[0021] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0022] Figure 6 This is a diagram showing the fit between the additional block and the slider of an internal support type limiting fixture for lathes according to this utility model.

[0023] In the diagram: 1. Fixture body; 2. Positioning component; 3. Product fixing component; 4. Pull stud; 5. Additional block; 6. Pull rod; 7. Slider; 8. Bolt; 9. Slide groove; 10. Spring; 11. Ejector block; 12. Screw hole; 13. Chamber; 14. Countersunk hole. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1 - Figure 6This utility model provides a technical solution: an internal support type limiting fixture for a lathe, comprising a fixture body 1, a positioning element 2, a product fixing element 3, a pull stud 4, and a pull rod 6. The fixture body 1 is connected to an external lathe. The pull rod 6 is fixedly connected to one end of the fixture body 1, and the pull rod 6 and the external machine tool are located on the same side. The positioning element 2 is fixedly connected to the middle of the end of the fixture body 1 away from the pull rod 6. The product fixing element 3 is located at the end of the positioning element 2 away from the fixture body 1. The pull stud 4 has a cylindrical structure. The product fixing part 3 is provided with a frustum-shaped block, and the small end of the frustum-shaped block is fixedly connected to the pull rivet 4. The pull rivet 4 is located at the end of the product fixing part 3 away from the positioning part 2. The end of the pull rivet 4 away from the frustum-shaped block passes through the middle of the product fixing part 3, the positioning part 2, the clamp body 1 and the pull rod 6 in sequence. The middle part of the end of the product fixing part 3 away from the positioning part 2 is provided with an inclined surface that fits against the side of the frustum-shaped block at one end of the pull rivet 4. The inclined surface that fits against the pull rivet 4 reduces the scratching between the product fixing part 3 and the pull rivet 4 when the product fixing part 3 opens. The pull stud 4 is fixedly connected to the pull rod 6. Four slots are equidistantly spaced on the surface of the product fixing component 3, with the end of each slot away from the positioning component 2 penetrating the product fixing component 3 and allowing it to open and close. Four sets of chambers 13 are equidistantly spaced on the surface of the product fixing component 3. Two springs 10 are symmetrically fixedly connected to the ends of the four sets of chambers 13 away from the outer side of the product fixing component 3. An ejector block 11 is fixedly connected to the end of each spring 10 facing the outer side of the product fixing component 3, and the outer end of the ejector block 11 is slidably connected to the side wall of the chamber 13. The ends of the ejector block 11 away from the positioning component 2 and away from the springs 10 have inclined surfaces. These inclined surfaces prevent the workpiece from colliding with the ejector block 11 when passing through its surface. A limiting structure is provided on the opening side of the chamber 13, limiting the ejector block 11 and preventing the springs 10 from pushing the ejector block 11 away from the chamber 13. Four additional blocks 5 are slidably connected to the outer end of the product fastener 3, and the four additional blocks 5 are respectively located between two adjacent slots. The outer end of the additional block 5 has a countersunk hole 14, and the head of the bolt 8 is located in the countersunk hole 14. The countersunk hole 14 hides the head of the bolt 8, so that there is no protrusion on the surface of the additional block 5, avoiding damage to the workpiece being fixed. The surface of the product fastener 3 has a screw hole 12. The end of the additional block 5 away from the product fastener 3 has a bolt 8, and the bolt 8 passes through the additional block 5 and is rotatably connected to the additional block 5. The end of the bolt 8 that passes through the additional block 5 extends into the screw hole 12, and the bolt 8 is threadedly connected to the screw hole 12. The additional blocks 5 are used to increase the outer diameter of the product fastener 3, thereby fixing workpieces with larger inner diameters and improving the applicability of the fixture.The surface of the product fixing part 3 has four T-shaped grooves 9 equidistantly spaced, and one end of each groove 9 passes through the end of the product fixing part 3 away from the positioning part 2. There are two grooves in each of the four groups, and the two grooves 9 in each group are symmetrical about the cavity 13. A T-shaped slider 7 is fixedly connected to the middle of one end of the additional block 5, and the slider 7 is located on the same side as the product fixing part 3. The slider 7 is located in the groove 9, and the outer end of the slider 7 is slidably connected to the side wall of the groove 9. The arc length of the additional block 5 on the same side as the product fixing part 3 is the same as the arc length of the four arc surfaces that are equidistantly divided by the four grooves on the outer end of the product fixing part 3. The slider 7 and the groove 9 cooperate to limit the position of the additional block 5, which facilitates the installation of the additional block 5. The arc length of the additional block 5 is the same as the arc length of the surface of the product fixing part 3, which pushes the ejector block 11 into the cavity 13 by the additional block 5. The spring 10 pushes the additional block 5 to prevent the bolt 8 from loosening.

[0026] Working principle: During use, the workpiece is placed on the product fixing part 3. The machine tool pulls the pull stud 4, causing the frustum-shaped block of the pull stud 4 to enter the product fixing part 3, thus opening the product fixing part 3 and providing internal support for the workpiece. During the process of the workpiece being placed on the product fixing part 3, the inner wall of the workpiece contacts the ejector block 11 and gradually presses the ejector block 11 into the chamber 13. The spring 10 pushes the ejector block 11 to apply pressure to the workpiece, thus pre-fixing the workpiece. Before fixing a workpiece whose inner diameter exceeds the opening range of the product fixing part 3, the additional block 5 is installed on the product fixing part 3 by inserting the slider 7 into the slide groove 9. The ejector block 11 is pushed into the chamber 13 by the additional block 5. The spring 10 pushes the ejector block 11 to make the slider 7 fit tightly against the slide groove 9. The additional block 5 is fixed by passing the bolt 8 through the screw hole 12. The operation of opening the product fixing part 3 is repeated to fix the workpiece.

[0027] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A lathe internal support type limiting fixture, comprising a fixture body (1), a positioning component (2), a product fixing component (3), a pull stud (4), and a pull rod (6), characterized in that, The fixture body (1) is connected to an external lathe. The pull rod (6) is fixedly connected to one end of the fixture body (1), and the pull rod (6) and the external machine tool are located on the same side. The positioning member (2) is fixedly connected to the middle of the end of the fixture body (1) away from the pull rod (6). The product fixing member (3) is located at the end of the positioning member (2) away from the fixture body (1). The pull stud (4) is a cylindrical structure. One end of the pull stud (4) is provided with a frustum block, and the small end of the frustum block is fixedly connected to the pull stud (4). The pull stud (4) is located at the end of the product fixing member (3) away from the positioning member (2), and the end of the pull stud (4) away from the frustum block passes through the product fixing member (3) and the positioning member (2) in sequence. The middle part of the component (2), the clamp body (1) and the pull rod (6) is fixedly connected to the pull rod (6); the surface of the product fixing component (3) is provided with four slots at equal intervals, and the end of the slot away from the positioning component (2) passes through the product fixing component (3) and makes the product fixing component (3) openable and closeable; the surface of the product fixing component (3) is provided with four sets of chambers (13) at equal intervals; the end of the four sets of chambers (13) away from the outer side of the product fixing component (3) is symmetrically fixedly connected with two springs (10); the end of the spring (10) facing the outer side of the product fixing component (3) is fixedly connected with an ejector block (11), and the outer end of the ejector block (11) is slidably connected to the side wall of the chamber (13).

2. The lathe internal support type limiting fixture as described in claim 1, characterized in that: The end of the ejector block (11) away from the positioning member (2) and the end of the ejector block (11) away from the spring (10) are provided with inclined surfaces.

3. The lathe internal support type limiting fixture as described in claim 1, characterized in that: The opening side of the chamber (13) is provided with a limiting structure, and the limiting structure limits the ejector block (11).

4. The lathe internal support type limiting fixture as described in claim 1, characterized in that: The outer end of the product fastener (3) is slidably connected to four additional blocks (5), and the four additional blocks (5) are respectively located between two adjacent slots. The surface of the product fastener (3) is provided with screw holes (12). The end of the additional block (5) away from the product fastener (3) is provided with a bolt (8), and the bolt (8) passes through the additional block (5) and is rotatably connected to the additional block (5). The end of the bolt (8) passing through the additional block (5) extends into the screw hole (12), and the bolt (8) is threadedly connected to the screw hole (12).

5. The lathe internal support type limiting fixture as described in claim 4, characterized in that: The surface of the product fixing part (3) is provided with four T-shaped grooves (9) at equal intervals, and one end of the groove (9) passes through the end of the product fixing part (3) away from the positioning part (2). There are two grooves (9) in each of the four groups, and the two grooves (9) in each group are symmetrical about the cavity (13) as the axis of symmetry. A T-shaped slider (7) is fixedly connected to the middle of one end of the additional block (5), and the slider (7) is located on the same side as the product fixing part (3). The slider (7) is located in the groove (9), and the outer end of the slider (7) is slidably connected to the side wall of the groove (9). The arc length of the additional block (5) on the same side of the product fixing part (3) is the same as the arc length of the four arc surfaces that are equally divided by the four grooves on the outer end of the product fixing part (3).

6. The lathe internal support type limiting fixture as described in claim 4, characterized in that: The outer end of the additional block (5) is provided with a countersunk hole (14), and the head of the bolt (8) is located in the countersunk hole (14).

7. The lathe internal support type limiting fixture as described in claim 1, characterized in that: The product fastener (3) has a beveled surface at the middle of the end away from the positioning member (2) that fits against the side of the frustum block at one end of the rivet (4).

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