Lathe fixture capable of being pressed in back-pulling mode

Abstract

The utility model discloses a backward pulling type pressing lathe clamp which comprises a clamp body and a pressing device, and the pressing device comprises a pull rod, a pull-down flange, a hemispherical stop block and a pull claw assembly. A mounting cavity is formed in the clamp body, a mounting hole communicated with the mounting cavity is formed in the upper end face of the clamp body, and the pull claw assembly is movably arranged in the mounting hole; the pull-down flange is movably connected with the mounting cavity in a non-rotatable mode, a hemispherical concave surface is formed in the side, facing the mounting cavity, of the pull-down flange, the hemispherical check block is slidably connected with the spherical surface of the pull-down flange through the hemispherical concave surface, and one end of the pull rod penetrates through the pull-down flange and then is connected with the hemispherical check block; the non-pressing end of the pull claw assembly is movably connected with the pull-down flange. Good transmission of pull-down force can be achieved, and fixed-point pressing can be achieved by automatically adjusting the pull-down depth of the corresponding pull claw assembly through swing of the pull-down flange according to the wall thickness difference between workpiece pressing points. And it is ensured that each pull claw assembly can be pressed in place, pressing is stable and reliable, and the machining efficiency and quality are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of clamps, in particular to a rear-pull type pressing lathe clamp. Background Art

[0002] A lathe clamp is a tool used to clamp parts. Due to a slight difference in wall thickness between the clamping points of the workpiece being processed, ordinary clamps in the prior art cannot ensure that each claw assembly can be clamped into place, resulting in the product not being pressed tightly, vibration during processing, inability to guarantee processing accuracy, low processing efficiency, and in severe cases, the workpiece will detach and fly out.

[0003] Therefore, by developing a rear-pull clamping lathe fixture, the hemispherical stopper and the lower pull flange adopt a spherical sliding connection structure, which can not only achieve good transmission of the downward pulling force, but also ensure that each pulling claw assembly can be clamped into place at a fixed point, and the clamping is firm and reliable, thereby improving processing efficiency and quality. Utility Model Content

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

[0005] A rear-pull type clamping lathe fixture comprises a clamp body connected to a lathe, characterized in that a clamping device is arranged on the clamp body, and the clamping device comprises a pull rod, a lower pull flange, a hemispherical stopper and two or more pull claw assemblies;

[0006] The clamp body is provided with a mounting cavity extending from the lower end surface to the interior, the upper end surface of the clamp body is provided with two or more mounting holes communicating with the mounting cavity, and the claw assembly is movably arranged in the mounting hole;

[0007] The pull-down flange is in a non-rotatable movably connected to the installation cavity, a hemispherical concave surface is provided in the middle of a side surface of the pull-down flange facing the installation cavity, the hemispherical stopper is slidably connected to the spherical surface of the pull-down flange through the hemispherical concave surface, and a through hole is provided in the middle of the hemispherical concave surface;

[0008] The pull rod is located on the side of the lower pull flange away from the hemispherical stopper, and one end of the pull rod passes through the through hole and is connected to the hemispherical stopper;

[0009] A workpiece positioning assembly is arranged in the middle of the upper end surface of the clamp body, two or more claw assemblies are located outside the workpiece positioning assembly, the non-clamping end of the claw assembly is movably connected to the lower pull flange, and the clamping end is located above the workpiece positioning assembly.

[0010] Preferably, a connecting assembly is provided between the lower pull flange and the claw assembly, and the connecting assembly enables the lower pull flange to be connected to the claw assembly and to swing relative to the claw assembly at the same time.

[0011] Preferably, a connection hole is provided at the connection between the lower pull flange and the pull claw assembly, and a countersunk hole is provided on the side of the connection hole away from the pull claw assembly;

[0012] The connecting assembly includes a ball screw, a ball gasket and a locking screw. The ball gasket and the ball screw are arranged in the countersunk hole in sequence. The middle part of the ball screw is connected to the claw assembly through the locking screw, and the spherical surface around the outside is connected to the spherical surface of the ball gasket.

[0013] Preferably, a guide column is provided in one of the connecting holes, a guide hole is opened at a position of the clamp body corresponding to the guide column, the guide column includes a guide section and a connecting section which are perpendicular to each other, the connecting section is provided in the countersunk hole, and the guide section is movably connected to the guide hole.

[0014] Preferably, a baffle for blocking the countersunk hole opening is provided on the side of the pull-down flange away from the guide hole.

[0015] Preferably, a limit assembly is provided between the pulling claw assembly and the clamp body, and the limit assembly is used to limit the freedom of the pulling claw assembly except for the axial movement relative to the mounting hole.

[0016] Preferably, the limit assembly includes a guide pin, and the claw assembly includes a connecting rod and a claw connected to the connecting rod;

[0017] The connecting rod is movably connected to the mounting hole, and an axially extending guide groove is provided on the outer surface of the middle part of the connecting rod. A pin hole is provided at a position of the clamp body corresponding to the guide groove, which radially penetrates the clamp body from the mounting hole to the outside; the guide pin is threadedly connected to the pin hole, and one end of the guide pin extends into the guide groove.

[0018] Preferably, the workpiece positioning assembly includes a support block connected to the clamp body and a positioning pin connected to the support block.

[0019] Preferably, a positioning ring is provided on the lower end surface of the clamp body, and the clamp body is connected to the lathe via the positioning ring.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] The utility model adopts a spherical sliding connection structure between the hemispherical stopper and the pull-down flange, which can not only realize good transmission of the pull-down force, but also automatically adjust the pull-down depth of the corresponding claw assembly by swinging the pull-down flange according to the wall thickness difference between the clamping points of the workpiece to realize fixed-point clamping, thereby ensuring that each claw assembly can be clamped in place, the clamping is firm and reliable, and the processing efficiency and quality are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0023] Figure 2 It is a top view of the utility model;

[0024] Figure 3 for Figure 2 Schematic diagram of the AA section structure;

[0025] Figure 4 for Figure 2 Schematic diagram of the structure of the middle BB section;

[0026] Figure 5 for Figure 3 A partial enlarged schematic diagram of point C in the middle;

[0027] Among them: clamping body 1, clamping device 2, pull rod 3, lower pull flange 4, hemispherical stopper 5, claw assembly 6, workpiece positioning assembly 7, connecting assembly 8, guide column 9, baffle 10, limit assembly 11, positioning ring 12, mounting cavity 1a, mounting hole 1b, guide hole 1c, pin hole 1d, hemispherical concave surface 41, through hole 42, connecting hole 43, countersunk hole 44, connecting rod 61, claw 62, support block 71, positioning pin 72, ball head screw 81, ball head gasket 82, locking screw 83, guide section 91, connecting section 92, guide pin 111, guide groove 61a. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the accompanying drawings. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0029] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be an element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an element centered thereon at the same time. The terms "vertical", "horizontal", "left", "right", "up", "down", "front", "rear" and similar expressions used herein are for illustrative purposes only.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0031] Below, in conjunction with the accompanying drawings and specific implementation methods, the utility model is further described:

[0032] like Figure 1-5 As shown, a rear-pull type clamping lathe fixture comprises a clamp body 1 connected to a lathe, the clamp body 1 is provided with a clamping device 2, the clamping device 2 comprises a pull rod 3, a lower pull flange 4, a hemispherical stopper 5 and two or more pull claw assemblies 6;

[0033] The clamp body 1 is provided with a mounting cavity 1a extending from the lower end surface to the inside, and the upper end surface of the clamp body 1 is provided with two or more mounting holes 1b communicating with the mounting cavity 1a, and the claw assembly 6 is movably arranged in the mounting hole 1b;

[0034] The lower pull-down flange 4 is movably connected to the installation cavity 1a in a non-rotatable manner, a hemispherical concave surface 41 is provided in the middle of a side surface of the lower pull-down flange 4 facing the installation cavity 1a, the hemispherical stopper 5 is spherically slidably connected to the lower pull-down flange 4 through the hemispherical concave surface 41, and a through hole 42 is provided in the middle of the hemispherical concave surface 41;

[0035] The pull rod 3 is located on the side of the lower pull flange 4 away from the hemispherical stopper 5, and one end of the pull rod 3 passes through the through hole 42 and is connected to the hemispherical stopper 5;

[0036] A workpiece positioning assembly 7 is provided in the middle of the upper end surface of the clamp body 1, and two or more claw assemblies 6 are located outside the workpiece positioning assembly 7. The non-clamping end of the claw assembly 6 is movably connected to the lower pull flange 4, and the clamping end is located above the workpiece positioning assembly 7.

[0037] In this embodiment, a 1 mm movable gap is provided between the lower pull-down flange 4 and the mounting cavity 1a, and between the through hole 42 and the pull rod 3. When working, the lathe is started, and the workpiece is placed on the clamp body 1 through the workpiece positioning assembly 7, and then the pull rod 3 is pulled down, so that the hemispherical stopper 5 drives the lower pull-down flange 4 to move downward, and then the lower pull-down flange 4 drives the claw assembly 6 to press the workpiece;

[0038] When there is a difference in wall thickness between the clamping points of the workpiece (the wall thickness between the clamping points of the workpiece is within 0.5 mm), since the lower pull-down flange 4 is hemispherically slidably connected to the hemispherical stopper 5, the lower pull-down flange 4 can swing relative to the hemispherical stopper 5 according to the clamping situation of each claw assembly 6 and the corresponding clamping point under the drive of the pull rod 3 and the hemispherical stopper 5, thereby adjusting the pull-down depth of the corresponding claw assembly 6 to achieve fixed-point clamping; compared with the existing technology, it can ensure that each claw assembly 6 can be clamped in place, the clamping is firm and reliable, and the processing efficiency and quality are improved.

[0039] In addition, since the claw assembly 6 is movably connected to the lower pull flange 4, the swing of the lower pull flange 4 is not restricted.

[0040] Further, such as Figure 3 , 5 As shown, a connecting assembly 8 is provided between the lower pull flange 4 and the claw assembly 6 , and the connecting assembly 8 can connect the lower pull flange 4 to the claw assembly 6 and swing relative to the claw assembly 6 .

[0041] In this embodiment, the above structure, while playing a connecting role, can drive the corresponding claw assembly 6 to move axially relative to the mounting hole 1b through the swing of the pull-down flange 4, thereby reaching the adjustment of the pull-down depth of the corresponding claw assembly 6.

[0042] Further, such as Figure 3 , 5 As shown, a connection hole 43 is provided at the connection between the lower pull flange 4 and the pull claw assembly 6, and a countersunk hole 44 is provided on the side of the connection hole 43 away from the pull claw assembly 6;

[0043] The connecting assembly 8 includes a ball head screw 81, a ball head gasket 82 and a locking screw 83. The ball head gasket 82 and the ball head screw 81 are arranged in the countersunk hole 44 in sequence. The middle part of the ball head screw 81 is connected to the claw assembly 6 through the locking screw 83, and the spherical surfaces around the outer side are connected to the spherical surfaces of the ball head gasket 82.

[0044] In this embodiment, the above structure, through the arrangement of the ball head screw 81 and the ball head gasket 82, when the pull-down flange 4 swings, the spherical surface of the ball head screw 81 squeezes the ball head gasket 82, thereby pulling down the corresponding claw assembly 6, thereby achieving the function of adjusting the pull-down depth of the corresponding claw assembly 6.

[0045] Further, such as Figure 4 As shown, a guide column 9 is arranged in one of the connecting holes 43, and a guide hole 1c is opened at a position of the clamp body 1 corresponding to the guide column 9. The guide column 9 includes a guide section 91 and a connecting section 92 which are perpendicular to each other. The connecting section 92 is arranged in the countersunk hole 44, and the guide section 91 is movably connected to the guide hole 1c.

[0046] In this embodiment, because a movable gap is provided between the lower pull-down flange 4 and the mounting cavity 1a, the stability of the movement of the lower pull-down flange 4 relative to the clamp body 1 is improved through the provision of the guide column 9, so that the lower pull-down flange 4 can swing according to the wall thickness difference between the clamping points of the workpiece after stable movement, thereby improving the reliability of clamping.

[0047] Further, such as Figure 3 , 4 As shown in Figures 5 and 5, a baffle 10 for blocking the opening of the countersunk hole 44 is provided on the side of the pull-down flange 4 away from the guide hole 1c.

[0048] In this embodiment, the baffle 10 is provided to prevent the guide post 9 from being separated from the guide hole 1c and the connecting hole 43, thereby improving reliability.

[0049] Further, such as Figure 1 , 3 As shown, a limiting assembly 11 is provided between the pulling claw assembly 6 and the clamp body 1 , and the limiting assembly 11 is used to limit the freedom of the pulling claw assembly 6 except for the axial movement relative to the mounting hole 1 b.

[0050] In this embodiment, the above structure can prevent the claw assembly 6 from rotating about the axis of the corresponding mounting hole 1b, thereby ensuring that the claw assembly 6 accurately and effectively presses the workpiece.

[0051] Further, such as Figure 1 , 3 As shown, the limit assembly 11 includes a guide pin 111, and the claw assembly 6 includes a connecting rod 61 and a claw 62 connected to the connecting rod 61;

[0052] The connecting rod 61 is movably connected to the mounting hole 1b, and an axially extending guide groove 61a is provided on the middle outer surface of the connecting rod 61. A pin hole 1d is provided at a position corresponding to the clamp body 1 and the guide groove 61a, which radially penetrates the clamp body 1 from the mounting hole 1b to the outside; the guide pin 111 is threadedly connected to the pin hole 1d, and one end of the guide pin 111 extends into the guide groove 61a.

[0053] In this embodiment, the above structure allows the claw assembly 6 to move axially relative to the mounting hole 1b within an effective stroke range, while preventing the claw assembly 6 from rotating relative to the mounting hole 1b, further improving the clamping reliability.

[0054] Further, such as Figure 3 As shown, the workpiece positioning assembly 7 includes a support block 71 connected to the clamp body 1 and a positioning pin 72 connected to the support block 71 .

[0055] In this embodiment, the above-mentioned structure, the structure and position design of the support block 71 and the positioning pin 72 are determined according to the structure of the workpiece to be processed. The positioning pin 72 and the support block 71 are used to accurately place the workpiece on the clamp body 1, and then the clamping device 2 is used to clamp and fix it.

[0056] Further, such as Figure 4 As shown, a positioning ring 12 is provided on the lower end surface of the clamp body 1 , and the clamp body 1 is connected to the lathe via the positioning ring 12 .

[0057] For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the scope of protection of the claims of the utility model patent.

Claims

1. A back-pull type clamping lathe fixture, comprising a clamp body connected to a lathe, characterized in that: The clamp body is provided with a clamping device, which includes a pull rod, a lower pull flange, a hemispherical stopper and two or more pull claw assemblies; The clamp body is provided with a mounting cavity extending from the lower end surface to the interior, the upper end surface of the clamp body is provided with two or more mounting holes communicating with the mounting cavity, and the claw assembly is movably arranged in the mounting hole; The pull-down flange is in a non-rotatable movably connected to the installation cavity, a hemispherical concave surface is provided in the middle of a side surface of the pull-down flange facing the installation cavity, the hemispherical stopper is slidably connected to the spherical surface of the pull-down flange through the hemispherical concave surface, and a through hole is provided in the middle of the hemispherical concave surface; The pull rod is located on the side of the lower pull flange away from the hemispherical stopper, and one end of the pull rod passes through the through hole and is connected to the hemispherical stopper; A workpiece positioning assembly is arranged in the middle of the upper end surface of the clamp body, two or more claw assemblies are located outside the workpiece positioning assembly, the non-clamping end of the claw assembly is movably connected to the lower pull flange, and the clamping end is located above the workpiece positioning assembly.

2. A back-pull type clamping lathe fixture according to claim 1, characterized in that: A connecting assembly is provided between the lower pull flange and the claw assembly, and the connecting assembly can connect the lower pull flange to the claw assembly and swing relative to the claw assembly.

3. The back-pull type clamping lathe fixture according to claim 2, characterized in that: A connection hole is provided at the connection between the lower pull flange and the claw assembly, and a countersunk hole is provided on the side of the connection hole away from the claw assembly; The connecting assembly includes a ball screw, a ball gasket and a locking screw. The ball gasket and the ball screw are arranged in the countersunk hole in sequence. The middle part of the ball screw is connected to the claw assembly through the locking screw, and the spherical surface around the outside is connected to the spherical surface of the ball gasket.

4. The back-pull type clamping lathe fixture according to claim 3, characterized in that: A guide column is arranged in one of the connecting holes, and a guide hole is opened at a position of the clamp body corresponding to the guide column. The guide column includes a guide section and a connecting section which are perpendicular to each other. The connecting section is arranged in the countersunk hole, and the guide section is movably connected to the guide hole.

5. The back-pull type clamping lathe fixture according to claim 4, characterized in that: A baffle for blocking the countersunk hole opening is arranged on the side of the pull-down flange away from the guide hole.

6. The back-pull type clamping lathe fixture according to claim 1, characterized in that: A limit assembly is arranged between the pulling claw assembly and the clamp body, and the limit assembly is used to limit the freedom of the pulling claw assembly except the axial movement relative to the mounting hole.

7. The back-pull-type clamping lathe fixture according to claim 6, characterized in that: The limit assembly includes a guide pin, and the pull claw assembly includes a connecting rod and a pull claw connected to the connecting rod; The connecting rod is movably connected to the mounting hole, and an axially extending guide groove is provided on the outer surface of the middle part of the connecting rod. A pin hole is provided at a position of the clamp body corresponding to the guide groove, which radially penetrates the clamp body from the mounting hole to the outside; the guide pin is threadedly connected to the pin hole, and one end of the guide pin extends into the guide groove.

8. The back-pull type clamping lathe fixture according to claim 1, characterized in that: The workpiece positioning assembly comprises a support block connected to the clamp body and a positioning pin connected to the support block.

9. The back-pull type clamping lathe fixture according to claim 1, characterized in that: A positioning ring is arranged on the lower end surface of the clamp body, and the clamp body is connected to the lathe via the positioning ring.

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