CN216576692U

CN216576692U - Centering alignment fixture

Info

Publication number: CN216576692U
Application number: CN202122680487.0U
Authority: CN
Inventors: 陈宗元; 罗文库; 范小成; 谢继忠; 陈锦鸿; 林焕然
Original assignee: Spaco Intelligent Technology Dongguan Co ltd
Current assignee: Spaco Intelligent Technology Dongguan Co ltd
Priority date: 2021-11-03
Filing date: 2021-11-03
Publication date: 2022-05-24
Anticipated expiration: 2031-11-03

Abstract

The utility model discloses a center-separation alignment fixture, which comprises a base, a center-separation positioning block, a screw rod, a left clamping block and a right clamping block, wherein the center-separation positioning block is embedded in the central position of the base, the screw rod is rotatably embedded in the base along the lengthwise direction of the base, and can be rotationally clamped in the centering positioning block, the screw rod is provided with a left-handed thread and a right-handed thread which are symmetrically arranged, the opposite lower ends of the left clamping block and the right clamping block are slidably embedded in the base, and the centering positioning block is taken as a symmetrical center and is connected on the corresponding left-handed thread and right-handed thread in a threaded manner, the opposite upper ends of the left clamping block and the right clamping block are slidably abutted against the left and right opposite sides of the top end surface of the base, the screw rod is rotated, the left clamping block and the right clamping block move oppositely or back to back by taking the centering positioning block as a center, so that the workpiece positioned between the left clamping block and the right clamping block is clamped or loosened. The centering alignment fixture disclosed by the utility model is simple in structure, strong in universality, accurate in positioning, stable in clamping and efficient.

Description

Centering alignment fixture

Technical Field

The utility model relates to a tool clamp, in particular to a center-dividing alignment clamp for clamping a workpiece.

Background

In the field of machining, a workpiece is often required to be clamped and fixed by means of a tool clamp so as to facilitate subsequent machining operation, wherein the vice type tool clamp can be generally matched with a machine tool, the workpiece can be clamped and operated by being fixed on a working machine table of the machine tool, and particularly, the workpiece is required to be fixed at the center of the machine table in many times, so that the tool clamp further needs to have an automatic centering function. With the continuous progress of science and technology, in order to meet the requirements of increasing machining precision and operating efficiency, the upgrading of machining equipment is more frequent, the problems of narrow application range, low universality, insufficient centering precision and low positioning efficiency exist in the conventional vice type tool clamp, and the production cost is increased if the tool clamp with multiple dimensions is additionally arranged.

Therefore, a center-dividing alignment fixture with simple structure, strong versatility, precise positioning, stable clamping and high efficiency is needed to overcome the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a centering alignment fixture which is simple in structure, strong in universality, accurate in positioning, stable in clamping and high in efficiency.

In order to achieve the purpose, the utility model discloses a center-splitting alignment fixture, which comprises a base, a center-splitting positioning block, a screw rod, a left clamping block and a right clamping block, wherein the center-splitting positioning block is embedded in the center of the base, the top end surface of the center-splitting positioning block is flush with the top end surface of the base, the screw rod is rotatably embedded in the base along the longitudinal direction of the base and rotatably clamped in the center-splitting positioning block, the screw rod is provided with a left-handed thread and a right-handed thread which are symmetrically arranged, the opposite lower ends of the left clamping block and the right clamping block are both slidably embedded in the base, the center-splitting positioning block is taken as a symmetrical center thread and is connected to the corresponding left-handed thread and right-handed thread, the opposite upper ends of the left clamping block and the right clamping block are slidably abutted against the left side and the right side of the top end surface of the base, and rotating the screw rod to enable the left clamping block and the right clamping block to move oppositely or back to back by taking the centering positioning block as a center, so as to clamp or loosen a workpiece positioned between the left clamping block and the right clamping block.

Preferably, the base is provided with an embedding groove arranged along the longitudinal direction of the base, the embedding groove is formed by sinking the top end surface of the base towards the bottom end surface of the base and penetrates through at least one of the left end surface and the right end surface of the base, and the centering positioning block, the screw rod, the left clamping block and the right clamping block are correspondingly embedded in the embedding groove.

Preferably, the centering alignment fixture further comprises a positioning pin, one end of the positioning pin is slidably clamped on the base along the lengthwise direction of the base, and the other end of the positioning pin is detachably connected with the opposite lower end of the left clamping block or the right clamping block which is embedded in the embedding groove.

Preferably, the embedding groove is further provided with a limiting groove arranged along the lengthwise direction of the base, the limiting groove is formed by the inner side wall of the embedding groove sinking towards the direction of the outer side wall of the embedding groove, at least one side of the front and back two opposite sides of the opposite lower ends of the left clamping block and the right clamping block is provided with a convex rib protruding outwards, and the shape and the protruding height of the convex rib correspond to the shape and the depth of the limiting groove on the corresponding side

Preferably, the left and right opposite sides of the top end of the base are correspondingly provided with a left sign and a right sign for orientation, the left clamping block and the right clamping block are correspondingly provided with the left sign and the right sign, and the left clamping block and the right clamping block are respectively assembled on the left and right opposite sides of the base corresponding to the left sign and the right sign in an aligned manner.

Preferably, an annular groove is formed in the center of the screw rod, a penetrating hole for the screw rod to penetrate through rotatably is formed in the centering positioning block, and a clamping ring structure matched with the annular groove is arranged in the penetrating hole and used for limiting the rotary screw rod to move along the axial direction of the rotary screw rod.

Preferably, the left clamping block and the right clamping block each include an embedding portion and a clamping portion, the embedding portion is slidably embedded in the embedding groove, a threaded hole matched with the left-hand thread or the right-hand thread is formed in the center of the embedding portion, the bottom end face of the clamping portion slidably abuts against the top end face of the base, and the width of the bottom end face of the clamping portion is larger than that of the top end of the base.

Preferably, the clamping portion is in an "L" shape, the clamping portion of the left clamping block has a first clamping surface located at the opposite right side wall of the transverse block and a second clamping surface located at the opposite right side wall of the vertical block, and the clamping portion of the right clamping block has a first clamping surface located at the opposite left side wall of the transverse block and a second clamping surface located at the opposite left side wall of the vertical block.

Preferably, the top side ends of the vertical blocks of the left clamping block and the right clamping block are respectively provided with a boss, the clamping part of the left clamping block is further provided with a third clamping surface located on the right side wall opposite to the boss, and the clamping part of the right clamping block is further provided with a third clamping surface located on the left side wall opposite to the boss.

Preferably, the centering alignment fixture further comprises a connecting seat, one end of the connecting seat is detachably connected with the base, and the other end of the connecting seat is used for being connected with a machine table.

Compared with the prior art, in the centering alignment fixture, on one hand, the centering positioning block is embedded in the central position of the base, and the top end face of the centering positioning block is flush with the top end face of the base, so that when a workpiece to be clamped is placed on the base, the centering positioning block can be used as a placement reference, and the positioning and the placement can be quickly and efficiently carried out; on the other hand, the screw rod embedded in the base is clamped and fixed by the sub-middle positioning block, so that the screw rod can rotate in the base by taking the sub-middle positioning block as a positioning center, and the screw rod is combined to be provided with the left-handed screw thread and the right-handed screw thread which are symmetrically arranged, the opposite lower ends of the left clamping block and the right clamping block which are embedded in the base in a sliding way are in threaded connection with the corresponding left-hand thread and right-hand thread by taking the centering positioning block as a symmetrical center, meanwhile, the opposite upper ends of the left clamping block and the right clamping block are correspondingly and slidably abutted against the left opposite side and the right opposite side of the top end surface of the base, thereby accurately controlling the movement of the left clamping block and the right clamping block on the rotating screw rod by rotating the screw rod, so that the left clamping block and the right clamping block move oppositely or back to back with the centering positioning block as the center, therefore, the workpiece positioned between the left clamping block and the right clamping block is clamped or loosened, and the workpiece is clamped and fixed at the center of the clamp efficiently and accurately in positioning; moreover, the clamp can be matched with workpieces with different sizes and specifications by adjusting the relative distance between the left clamping block and the right clamping block, so that the adaptability of the clamp is effectively improved; in addition, the top end face of the centering positioning block is flush with the top end face of the base, so that the centering positioning block does not influence the movement of the left clamping block and the right clamping block on the base.

Drawings

Fig. 1 is a plan view of the centering alignment jig of the present invention.

Fig. 2 is a sectional view taken along a-a in fig. 1.

Fig. 3 is an exploded view of the centering alignment fixture of the present invention.

Fig. 4 is a perspective view of the base of the present invention.

Fig. 5 is a perspective view of the left clamp block of the present invention.

Detailed Description

In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.

Referring to fig. 1 to 5, the present invention discloses a centering alignment fixture 100 for clamping and fixing a workpiece, which includes a base 10, a centering positioning block 20, a screw rod 30, a left clamping block 40 and a right clamping block 50, wherein the centering positioning block 20 is embedded in the center of the base 10, the top end surface of the centering positioning block 20 is flush with the top end surface of the base 10, the screw rod 30 is rotatably embedded in the base 10 along the longitudinal direction of the base 10 and rotatably clamped in the centering positioning block 20, and the screw rod 30 is provided with a left-handed thread 31 and a right-handed thread 32 which are symmetrically arranged; the opposite lower ends of the left clamping block 40 and the right clamping block 50 are slidably embedded in the base 10, and are in threaded connection with the corresponding left-handed thread 31 and the right-handed thread 32 by taking the centering positioning block 20 as a symmetric center, and the opposite upper ends of the left clamping block 40 and the right clamping block 50 are slidably abutted against the left side and the right side of the top end surface of the base 10; the screw rod 20 is rotated to enable the left clamping block 40 and the right clamping block 50 to move oppositely or back to back around the centering positioning block 20, so that the workpiece positioned between the left clamping block 40 and the right clamping block 50 is clamped or loosened, and the workpiece is clamped and fixed at the center position of the alignment clamp 100 in the centering positioning block efficiently and accurately in positioning. The workpiece is clamped and fixed in a clamping space defined by the left clamping block 40 and the right clamping block 50, the left clamping block 40 and the right clamping block 50 move relative to the middle positioning block 20, the workpiece in the clamping space can be clamped or loosened, and the size of the clamping space can be adjusted, so that the clamping fixture is suitable for clamping and fixing workpieces of different specifications and sizes, and is simple in structure and high in universality.

When the centering positioning device is used specifically, the screw rod 30 can be driven to rotate clockwise or anticlockwise relative to the positive direction by a wrench or a rotary driver connected with the screw rod 30, so that the screw rod 30 drives the left clamping block 40 and the right clamping block 50 to move linearly on the screw rod 30 towards the direction close to the centering positioning block 20, and the left clamping block and the right clamping block are close to each other to clamp a workpiece, so that the workpiece is clamped and fixed; when the screw rod 30 is driven to rotate reversely by operating a wrench or a rotary driver connected with the screw rod 30, the left clamping block 40 and the right clamping block 50 are driven to move linearly on the screw rod 30 towards the direction far away from the centering positioning block 20, so that the workpieces are far away from each other to loosen, and the clamped workpieces are unloaded.

Referring to fig. 1 to 4, in the present embodiment, the base 10 is further provided with an embedding groove 11 disposed along the longitudinal direction thereof, the embedding groove 11 is formed by the top end surface of the base 10 being recessed toward the bottom end surface of the base 10, and penetrates at least one of the left end surface and the right end surface of the base 10, and the centering positioning block 20, the screw rod 30, the left clamping block 40, and the right clamping block 50 are correspondingly embedded in the embedding groove 11. The setting of embedding groove 11 not only is convenient for divide the assembly of well locating piece 20, lead screw 30, left clamp splice 40 and right clamp splice 50 and base 10 to, through the setting of holding of embedding groove 11, make the structure of whole anchor clamps compacter, effectively reduce the volume and the weight of this anchor clamps, thereby reduce cost. Preferably, the embedding slot 11 is disposed to penetrate through the left and right end surfaces of the base 10, so that the left clamping block 40 and the right clamping block 50 can slide into the embedding slot 11 from the openings of the left and right end surfaces of the base 10, thereby facilitating assembly and maintenance. Specifically, the opposite lower ends of the left clamping block 40 and the right clamping block 50 are clamped in the embedding groove 11 in a clearance fit manner, so that the left clamping block can slide in the embedding groove 11, wherein the clearance between the bottom end faces of the left clamping block 40 and the right clamping block 50 and the bottom wall of the embedding groove 11 is relatively larger, and the left clamping block 40 and the right clamping block 50 can be assembled and disassembled in the embedding groove 11 more conveniently.

Referring to fig. 3 to 5, the top end surface of the base 10 is a plane, and the abutting surfaces of the left clamping block 40 and the right clamping block 50, which abut against the top end surface of the base 10, are also planes, so that the two slide on the base 10 smoothly and stably. In addition, the left and right opposite sides of the top side end of the base 10 are correspondingly provided with the left mark 12 and the right mark 13 for orientation, correspondingly, the left clamping block 40 and the right clamping block 50 are correspondingly provided with the left mark 12 and the right mark 13 for orientation, the left clamping block 40 with the left mark 12 is correspondingly arranged on one side of the base 10 with the left mark 12, and the right clamping block 50 with the right mark 13 is correspondingly arranged on one side of the base 10 with the right mark 13, so that the left clamping block 40 and the right clamping block 50 are correspondingly assembled on the base 10 in an alignment manner through the left mark 12 and the right mark 13, and the assembly efficiency is effectively improved. Specifically, the left direction indicator 12 and the right direction indicator 13 are specifically indicated by the letters "L" and "R".

Referring to fig. 3 and 4, in the present embodiment, in order to facilitate the positioning and assembling of the centering and positioning block 20, two notches 14 are disposed at the front and rear opposite side edges of the central position of the top side end of the base 10, and the two notches 14 are respectively communicated with the embedding slot 11. Specifically, the notch 14 is formed by recessing the edge of the notch of the embedding slot 11 toward the front end surface or the rear end surface of the base 10, and the centering positioning block 20 is vertically embedded into the embedding slot 11 from top to bottom from the two notches 12. The centering block 20 inserted into the embedding slot 11 is also detachably connected to the embedding slot 11 by a fastener 60, so as to be firmly and easily fixed to the base 10. The fastener 60 may be a cylindrical pin, and the number of the cylindrical pins may be two, so that the centering block 20 is stably and firmly fixed in the base 10.

Referring to fig. 2 and 3, in the present embodiment, in order to facilitate the positioning and assembling with the centering and positioning block 20, an annular groove 33 is disposed at the center position of the screw rod 30, a penetrating hole 21 for the screw rod 30 to rotatably penetrate is disposed on the centering and positioning block 20, a snap ring structure 22 matched with the annular groove 33 is disposed in the penetrating hole 21, and when the screw rod 30 rotates in the penetrating hole 21, the rotation is performed with the centering and positioning block 20 as a positioning fulcrum through the snap-fit of the snap ring structure 22 and the annular groove 33, and the axial movement of the rotating screw rod 30 is effectively limited, so as to conveniently and accurately position and clamp the workpiece at the center position of the base 10.

Referring to fig. 3 and 4, in order to realize the positioning and assembling of the left clamping block 40 and the right clamping block 50 on the base 10, the centering alignment fixture 100 of the present invention further includes a positioning pin 70 for connecting the outer side of the base 10 with the left clamping block 40 or the right clamping block 50 slidably disposed in the embedding slot 11, so as to firmly fix the left clamping block 40 and the right clamping block 50 in the base 10, so that both can slide in the embedding slot 11 and cannot slip out of the embedding slot 11. One end of the positioning pin 70 is slidably engaged with the base 10 along the longitudinal direction of the base 10, and the other end of the positioning pin 70 is detachably connected to the opposite lower end of the left clamping block 40 or the right clamping block 50 slidably disposed in the embedding slot 11. Preferably, a positioning pin 70 is connected to each of the front and rear opposite sides of the left clamping block 40 and the right clamping block 50, so that the stability of the connection between the left clamping block and the base 10 is further improved by the positioning pins 70 on both sides.

Specifically, in this embodiment, the section of the embedding slot 11 is substantially U-shaped, the front end surface or/and the rear end surface of the base 10 is correspondingly provided with a positioning through hole 15 communicated with the embedding slot 11, the positioning through hole 15 is disposed along the longitudinal direction of the base 10 for passing the positioning pin 70 connected to the opposite lower end of the left clamping block 40 or the right clamping block 50, so as to facilitate passing and clamping of the positioning pin 70, and guide and limit sliding of the positioning pin 70. Specifically, the positioning through hole 15 is a kidney-shaped hole, two positioning through holes 15 are respectively arranged on the left and right opposite sides of the front end surface and the rear end surface of the base 10, and the positioning pins 70 are arranged in one-to-one correspondence with the positioning through holes 15, so that the left clamping block 40 and the right clamping block 50 can slide stably in the base 10 through the two positioning pins 70 correspondingly arranged on the front and rear opposite sides of the left clamping block 40 and the right clamping block 50.

Referring to fig. 3 and 4, in some embodiments, the inner sidewall of the embedding slot 11 is further provided with a limiting slot 16 disposed along the lengthwise direction of the base 10, the limiting slot 16 is formed by recessing the inner sidewall of the embedding slot 11 toward the outer sidewall thereof, at least one of the front and rear opposite sides of the opposite lower ends of the left clamping block 40 and the right clamping block 50 is correspondingly provided with a protruding rib 411 and a protruding rib 511, the shape and the protruding height of the protruding rib 411 and the protruding rib 511 correspond to the shape and the depth of the limiting slot 16 on the corresponding side, so that the protruding rib 411 and the protruding rib 511 are slidably engaged with the limiting slot 16, thereby enhancing the connection between the left clamping block 40 and the right clamping block 50 and the base 10, and guiding and limiting the sliding of the two in the base 10. Specifically, the number of the limiting grooves 16 is two, and the two limiting grooves 16 are symmetrically arranged, the two front and rear opposite side convex ribs 411 of the left clamping block 40 are correspondingly clamped in the limiting grooves 16 on the two sides one by one and can slide in the corresponding limiting grooves 16, the two front and rear opposite side convex ribs 511 of the right clamping block 50 are correspondingly clamped in the limiting grooves 16 on the two sides one by one and can slide in the corresponding limiting grooves 16, and at this time, the cross-sectional shape of the embedding groove 11 is roughly in a cross shape.

It should be noted that, when the embedding slot 11 is provided with both the limiting slot 16 and the positioning through hole 15, the positioning through hole 15 on the same side is communicated with the limiting slot 16, and the positioning pin 70 passes through the positioning through hole 15 and then is detachably connected with the left clamping block 40 or the right clamping block 50 in the limiting slot 16. Specifically, the number of the limiting grooves 16 is two, two positioning through holes 15 are respectively formed in the left and right opposite sides of the front and rear opposite end surfaces of the base 10, and the four positioning pins 70 are detachably connected to the positioning holes 4111 of the protruding rib 411 and the positioning holes 5111 of the protruding rib 511 in the front and rear opposite sides of the left clamping block 40 and the right clamping block 50 after passing through the positioning through holes 15 in the two sides in a one-to-one correspondence manner.

Specifically, in the present embodiment, with reference to fig. 2, 3 and 5, the left clamping block 40 includes an embedding portion 41 and a clamping portion 42, the embedding portion 41 is slidably embedded in the embedding slot 11, a threaded hole 412 matched with the left-hand thread 31 is disposed at a central position of the embedding portion 41, a bottom end surface of the clamping portion 42 slidably abuts on a top end surface of the base 10, and a width dimension of the bottom end surface of the clamping portion 42 is greater than a width dimension of the top end surface of the base 10. When the protruding ribs 411 are provided on the left clamping block 40, the protruding ribs 411 are specifically provided on the front and rear opposite sides of the embedding portion 41, and the outer contour of the left clamping block 40 is substantially cross-shaped, so as to match with the embedding groove 11, the cross-sectional shape of which is specifically cross-shaped. The right clamping block 50 has a structure substantially identical to that of the left clamping block 40, and includes an embedding portion 51 and a clamping portion 52, the embedding portion 51 is slidably embedded in the embedding slot 11, a threaded hole 512 matched with the right-handed thread 32 is formed in a central position of the embedding portion 51, a bottom end surface of the clamping portion 52 slidably abuts against a top end surface of the base 10, and a width dimension of the bottom end surface of the clamping portion 52 is greater than a width dimension of the top end surface of the base 10.

Specifically, the clamping portion 42 and the clamping portion 52 are both in an "L" shape as a whole, the clamping portion 42 has a first clamping surface 42a at the opposite right side wall of the transverse block 421 thereof and a second clamping surface 42b at the opposite right side wall of the vertical block 422, correspondingly, the clamping part 52 is also provided with a first clamping surface 52a at the left side wall of the transverse block 521 and a second clamping surface 52b at the left side wall of the vertical block 522, so that the workpiece can be clamped and fixed in the clamping space defined by the first clamping surface 42a, the top end surface of the base 10 and the first clamping surface 52a, can also be clamped and fixed in the clamping space defined by the second clamping surface 42b, the top end surface of the transverse block 421, the top end surface of the transverse block 521 and the second clamping surface 52b, further realize the centre gripping of the work piece of different sizes fixed, further improve the adaptability of this anchor clamps. The top end surfaces of the

transverse blocks

421 and 521 are both a plane and arranged in equal height.

Further, in some embodiments, the top end of the vertical block 422 of the clamping portion 42 further has a boss 423, the clamping portion 42 further has a third clamping surface 42c located at the opposite right side wall of the boss 423, correspondingly, the top end of the vertical block 522 of the clamping portion 52 also has a boss 523, and the clamping portion 52 further has a third clamping surface 52c located at the opposite left side wall of the boss 523, so that the workpiece can be clamped and fixed in the clamping space defined by the third clamping surface 42c, the top end surface of the vertical block 422, the top end surface of the vertical block 522, and the third clamping surface 52c, thereby further improving the adaptability of the clamp. Specifically, the top end surfaces of the vertical block 422 and the vertical block 522 are both a plane and arranged at the same height, and the right side wall opposite to the boss 423 and the left side wall opposite to the boss 523 are correspondingly provided with an arc-shaped structure or a tooth-shaped structure, so that a workpiece with an arc-shaped or tooth-shaped outer contour can be clamped and fixed conveniently, and the clamping and fixing effect is better.

Further, in some embodiments, the clamping portion 42 and the clamping portion 52 are provided with

graduation marks

424 and 524 corresponding to the top ends of the clamping portion, so that the positioning can be more efficiently performed by the numbers marked on the

graduation marks

424 and 524. When the clamping portion 42 and the clamping portion 52 have the

bosses

423 and 523, respectively, the

graduation lines

424 and 524 are correspondingly disposed at the top ends of the

bosses

423 and 523. The directions of the scale marks 424 and the numbers marked on the scale marks 524 on the left clamping block 40 and the right clamping block 50 can be opposite, so that the observation and the recognition from different directions of the base 10 are convenient, and the use is more convenient.

Referring to fig. 1 to 4, the centering alignment fixture 100 of the present invention further includes a connecting seat 80, one end of the connecting seat 80 is used for being detachably connected to the base 10, and the other end of the connecting seat 80 is used for being connected to the machine. Wherein, connecting seat 80 is whole comparatively frivolous, and has certain elasticity, is equipped with two at least spliced poles 81 on the connecting seat 80 for be connected with the bottom of base 10, still is equipped with guide slot 82 on the connecting seat 80, is used for being connected with board detachably.

Compared with the prior art, in the centering alignment fixture 100, on one hand, the centering positioning block 20 is embedded in the central position of the base 10, and the top end surface of the centering positioning block 20 is flush with the top end surface of the base 10, so that when a workpiece to be clamped is placed on the base 10, the centering positioning block 20 can be used as a placement reference, and the positioning and the placement can be quickly and efficiently carried out; on the other hand, the screw rod 30 embedded in the base 10 is clamped and fixed by the centering block 20, so as to rotate in the base 10 with the centering block 20 as a positioning center, the screw rod 30 is provided with a left-handed thread 31 and a right-handed thread 32 which are symmetrically arranged, the opposite lower ends of the left clamping block 40 and the right clamping block 50 which are slidably embedded in the base 10 are in threaded connection with the corresponding left-handed thread 31 and the corresponding right-handed thread 32 with the centering block 20 as a symmetrical center, and the opposite upper ends of the left clamping block 40 and the right clamping block 50 are correspondingly and slidably abutted against the left side and the right side of the top end surface of the base 10, so that the movement of the left clamping block 40 and the right clamping block 50 on the rotating screw rod 30 is accurately controlled by rotating the screw rod 30, so that the left clamping block 40 and the right clamping block 50 move oppositely or move back to back with the centering block 20 as a center, thereby clamping or loosening a workpiece positioned between the left clamping block 40 and the right clamping block 50, the workpiece is clamped and fixed at the center of the clamp efficiently and accurately in positioning; moreover, the relative distance between the left clamping block 40 and the right clamping block 50 can be adjusted to match with workpieces with different sizes, so that the adaptability of the clamp is effectively improved; in addition, because the top end surface of the centering positioning block 20 is flush with the top end surface of the base 10, the centering positioning block 20 does not influence the movement of the left clamping block 40 and the right clamping block 50 on the base 10, so that the clamping operation is smoother, and the centering alignment clamp 100 of the utility model has the advantages of simple overall structure, strong universality, accurate positioning, stable clamping and high efficiency.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.

Claims

1. A center-splitting alignment fixture is characterized by comprising a base, a center-splitting positioning block, a screw rod, a left clamping block and a right clamping block, wherein the center-splitting positioning block is embedded in the center of the base, the top end face of the center-splitting positioning block is flush with the top end face of the base, the screw rod is rotatably embedded in the base along the longitudinal direction of the base and rotatably clamped in the center-splitting positioning block, the screw rod is provided with a left-handed thread and a right-handed thread which are symmetrically arranged, the opposite lower ends of the left clamping block and the right clamping block are slidably embedded in the base, the center-splitting positioning block is used as a symmetrical center and is connected to the corresponding left-handed thread and right-handed thread, and the opposite upper ends of the left clamping block and the right clamping block are slidably abutted to the left-right opposite sides of the top end face of the base, and rotating the screw rod to enable the left clamping block and the right clamping block to move oppositely or back to back by taking the centering positioning block as a center, so as to clamp or loosen a workpiece positioned between the left clamping block and the right clamping block.

2. The centering alignment fixture according to claim 1, wherein the base has an embedding groove disposed along a longitudinal direction thereof, the embedding groove is formed by recessing a top end surface of the base toward a bottom end surface of the base and penetrates at least one of a left end surface and a right end surface of the base, and the centering block, the screw rod, the left clamping block and the right clamping block are embedded in the embedding groove.

3. The centering alignment fixture according to claim 2, further comprising a positioning pin, one end of which is slidably engaged with the base along a longitudinal direction of the base, and the other end of which is detachably connected to an opposite lower end of the left clamping block or the right clamping block inserted into the insertion groove.

4. The centering alignment fixture according to claim 2, wherein the embedding groove further has a limiting groove formed therein along a longitudinal direction of the base, the limiting groove is formed by recessing an inner sidewall of the embedding groove toward an outer sidewall thereof, at least one of front and rear opposite sides of opposite lower ends of the left clamping block and the right clamping block is provided with a protruding rib protruding outward, and the protruding rib has a shape and a protruding height corresponding to a shape and a depth of the limiting groove of the corresponding side.

5. The centering alignment fixture according to claim 1, wherein left and right opposite sides of a top side end of the base are provided with a left indicator and a right indicator for orientation, the left and right clamping blocks are provided with the left indicator and the right indicator, and the left and right clamping blocks are assembled on the left and right opposite sides of the base in alignment with the left indicator and the right indicator, respectively.

6. The centering alignment fixture according to claim 1, wherein an annular groove is formed in the center of the screw rod, a penetration hole for the screw rod to penetrate through is formed in the centering positioning block, and a snap ring structure matched with the annular groove is arranged in the penetration hole to limit the axial movement of the rotating screw rod.

7. The centering and aligning fixture according to claim 2, wherein each of the left and right clamping blocks includes an embedding portion and a clamping portion, the embedding portion is slidably embedded in the embedding groove, a threaded hole matching with the left-hand thread or the right-hand thread is formed in a center of the embedding portion, a bottom end surface of the clamping portion slidably abuts against a top end surface of the base, and a width of the bottom end surface of the clamping portion is larger than a width of the top end of the base.

8. The centering alignment jig of claim 7, wherein the clamping portion is "L" -shaped, the clamping portion of the left clamping block has a first clamping surface at an opposite right side wall of its lateral block and a second clamping surface at an opposite right side wall of its vertical block, and the clamping portion of the right clamping block has a first clamping surface at an opposite left side wall of its lateral block and a second clamping surface at an opposite left side wall of its vertical block.

9. The centering alignment fixture according to claim 8, wherein the top sides of the vertical blocks of the left clamping block and the right clamping block are respectively provided with a boss, the clamping portion of the left clamping block further has a third clamping surface at the right side wall opposite to the boss, and the clamping portion of the right clamping block further has a third clamping surface at the left side wall opposite to the boss.

10. The centering and aligning jig according to any one of claims 1 to 9, further comprising a connecting base, one end of said connecting base being detachably connected to said base, and the other end of said connecting base being adapted to be connected to a machine.