CN221737140U - Adjustable centering fixture - Google Patents

Abstract

The utility model discloses an adjustable centering clamp, which comprises: the upper locking ring is connected with the lower locking ring through a connecting plate, a sliding block and a clamp bottom plate are arranged at the bottom of the lower locking ring, and the sliding block is connected with an adjusting screw. The clamp disclosed by the utility model solves the problems that the clamp is difficult to center and cannot be transversely adjusted in the prior art, can be matched with a longitudinal sliding rail to adjust to realize two-axis adjustment, is accurate in centering, and is easy to operate.

Description

Adjustable centering fixture

Technical Field

The utility model relates to the technical field of clamps, in particular to an adjustable centering clamp.

Background

The clamp is an integral important component in the use of plastic pipe butt welding machines. However, most existing clamps have problems of difficult positioning and inaccurate centering. These clamps are usually only adjustable in a single axis, i.e. only movable in the direction of the slide rail, but not in a horizontal direction perpendicular to the slide rail. When the clamp with single-axis adjustment is used for butt joint of plastic pipes, the alignment is very difficult because the adjustment in the two-axis direction cannot be carried out, and the welding precision and quality are greatly affected. In addition, the single-shaft adjusting clamp is inconvenient to operate, the operators are required to have abundant experience and skill, the operation process is tedious and time-consuming, and the working efficiency is low.

Currently, most clamps on plastic pipe butt welding machines on the market can only be adjusted in a single shaft, namely can only move in the direction of a sliding rail, and cannot be adjusted in the horizontal direction perpendicular to the sliding rail. Such uniaxially adjustable clamps make centering very difficult when butt-jointing plastic pipes because of the inability to make two-axis adjustments. Even if the operator has a lot of experience, it is difficult to ensure accurate centering each time. In addition, the operation process of the single-shaft adjusting clamp is tedious and time-consuming, and the working efficiency is low. Therefore, there is an urgent need for a clamp capable of achieving two-axis adjustment to solve the problems in the prior art.

Public announcement number: CN218312964U, public announcement day: 2023-01-17 relates to a clamp which is convenient for centering pipeline connection construction. Make things convenient for anchor clamps of pipe connection construction centering, including base and a pair of being fixed in the fixing device of base top, a pair of fixing device is in on the same axis, fixing device includes a pair of slide rail, slide, the slide can be followed slide rail length direction slides, one end or both ends of slide rail are equipped with mobilizable stopper, through changing the position control of stopper sliding distance or fixed position of slide. The clamp can only move on the sliding rail, namely in the y-axis direction, and cannot be adjusted in the x-axis direction.

Disclosure of utility model

The utility model aims to solve the problems that in the prior art, the clamp is difficult to center and cannot be transversely adjusted, and provides an adjustable centering clamp which can be matched with a sliding rail to realize two-axis adjustment, is accurate in centering and is easy to operate.

In order to achieve the above purpose, the present utility model provides the following solutions: an adjustable centering fixture, comprising: the upper locking ring is connected with the lower locking ring through a connecting plate, a sliding block and a clamp bottom plate are arranged at the bottom of the lower locking ring, and the sliding block is connected with an adjusting screw.

Preferably, the upper locking ring is of a semicircular structure, the inner ring of the upper locking ring is provided with a first clamping part, the first clamping part is provided with a first clamping tooth and a first mounting groove, and the first clamping part is provided with a first locking hole.

Preferably, the lower locking ring is of a semicircular structure, the lower locking ring is matched with the upper locking ring, the inner ring of the lower locking ring is provided with a second clamping part, the second clamping part is provided with a second clamping tooth and a second mounting groove, and the second clamping part is provided with a second locking hole.

Preferably, the same matching side of the upper locking ring and the lower locking ring is respectively provided with a fixed block and a second rotating block, and the other matching side of the upper locking ring and the lower locking ring is respectively provided with a compressing block and a first rotating block.

Preferably, the fixed block is provided with a plurality of fixed holes, the first rotating block is provided with a through hole, the second rotating block is provided with a rotating hole, the first rotating block is connected with a compression screw, and a screw head of the compression screw is rotationally connected with the first rotating block.

Preferably, the connecting plate is provided with a plurality of first screw holes and second screw holes, and the number of the first screw holes is the same as that of the fixing holes.

Preferably, the bottom of the lower locking ring is provided with a mounting seat, the bottom of the mounting seat is provided with a groove and a plurality of positioning holes, the groove is internally provided with a mounting hole, the clamp bottom plate is provided with a plurality of adjusting holes and a plurality of limiting holes, and the adjusting holes correspond to the positioning holes.

Preferably, the sliding block is provided with a locking hole and a nut groove, the sliding block is connected with the mounting seat through the locking hole and the mounting hole, and the two sides of the sliding block are respectively provided with a first carry hole and a second carry hole.

Preferably, the clamp bottom plate is provided with a sliding groove, a sliding block is arranged in the sliding groove, a first carry groove and a second carry groove are respectively arranged on two sides of the clamp bottom plate, the adjusting screw comprises an adjusting knob and a position adjusting rod, the position adjusting rod is arranged in the first carry groove, and the position adjusting rod is connected with the first carry hole.

Preferably, the first mounting groove and the second mounting groove are respectively provided with a slip, the inner ring of the slip is provided with a third clamping tooth, the outer ring of the slip is provided with a locking groove corresponding to the first locking hole and the second locking hole, and the upper locking ring and the lower locking ring are respectively provided with a first mounting groove and a second mounting groove corresponding to the locking groove.

The beneficial effects of the utility model are as follows: the problem of among the prior art anchor clamps centering difficulty, can not transversely adjust is solved, can carry out accurate location to anchor clamps as required, cooperates the slide rail to realize the diaxon and adjusts, and accurate centering has improved work efficiency, can adjust according to different application scenes and demands, has more extensive suitability.

Drawings

Fig. 1 is an overall schematic of the present utility model.

Fig. 2 is a schematic view of a locking ring of the present utility model.

Fig. 3 is a schematic bottom view of the locking ring of the present utility model.

Fig. 4 is a front view of the locking ring of the present utility model.

Fig. 5 is a schematic of a slip of the present utility model.

Fig. 6 is a schematic view of a connection plate of the present utility model.

Fig. 7 is a schematic view of a compression screw of the present utility model.

Fig. 8 is a schematic view of the assembly of the lateral adjustment portion of the present utility model.

Fig. 9 is a schematic view of a clamp base plate of the present utility model.

FIG. 10 is a schematic view of a slider of the present utility model.

FIG. 11 is a schematic bottom view of a slider of the present utility model.

Fig. 12 is a schematic view of an adjustment screw of the present utility model.

The reference numerals in the figures illustrate: 1-upper locking ring, 1.1-first clamping part, 1.11-first locking hole, 1.2-first clamping tooth, 1.3-first mounting groove, 1.4-pressing block, 1.5-fixing block, 1.51-fixing hole, 1.6-first mounting groove, 2-lower locking ring, 2.1-second clamping part, 2.11-second locking hole, 2.2-second clamping tooth, 2.3-second mounting groove, 2.4-mounting seat, 2.41-groove, 2.42-mounting hole, 2.43-positioning hole, 2.5-first rotating block, 2.6-second rotating block, 2.61-rotating hole, 2.7-second mounting groove, 3-clamp bottom plate, 3.1-sliding groove, 3.2-first carry groove, 3.3-second carry groove, 3.4-hole, 3.5-limit hole, 4-sliding block, 4.1-locking hole, 4.2-second clamping tooth, 2.3-second clamping groove, 2.5-third clamping screw, 2.7-first clamping screw, 2.6-second clamping screw, 2.7-second clamping screw, 2.5-third clamping screw, 8-first adjusting screw, 2.7-second clamping screw, 8-third clamping screw, 8-second clamping screw.

Detailed Description

Specific embodiments of the utility model will be described in detail below, with the understanding that the embodiments described herein are merely some, but not all embodiments of the utility model. All other embodiments, which can be made by one of ordinary skill in the art without inventive effort, are within the scope of the present utility model based on the following embodiments.

The utility model provides the following technical scheme:

Example 1:

As shown in fig. 1, an adjustable centering fixture, comprising: the upper locking ring 1 and the lower locking ring 2 are rotatably connected through a connecting plate 7, a sliding block 4 is fixed at the bottom of the lower locking ring 2, a clamp bottom plate 3 is slidably connected at the bottom of the lower locking ring 2, the sliding block 4 is slidably connected with the clamp bottom plate 3, and the sliding block 4 is connected with an adjusting screw 5. The upper locking ring 1 and the lower locking ring 2 jointly form a locking ring part of a centering clamp, the upper locking ring 1 and the lower locking ring 2 can rotate around the connecting plate 7 under the action of the connecting plate 7, the bottom of the lower locking ring 2 is tightly locked through a compression screw 8 during clamping, the bottom of the lower locking ring 2 is connected with a transverse adjusting part formed by a sliding block 4, a clamp bottom plate 3 and an adjusting screw 5, after the two centering clamps are integrally installed on a clamp centering slide rail, the locking ring part can be transversely adjusted through the adjusting screw 5, the clamp centering slide rail can longitudinally adjust the whole centering clamp, and at the moment, the step of centering a plastic pipe can be completed, and the next welding is carried out.

As shown in fig. 2, fig. 3 and fig. 4, the upper locking ring 1 and the lower locking ring 2 have two semi-circular structures which can be matched with each other, the upper locking ring 1 and the lower locking ring 2 form a complete clamping locking ring part, the inner ring of the upper locking ring 1 is provided with a first clamping part 1.1, the inner ring of the lower locking ring 2 is provided with a second clamping part 2.1, the inner ring of the first clamping part 1.1 is provided with a first clamping tooth 1.2 and a first mounting groove 1.3 from outside to inside, the inner ring of the second clamping part 2.1 is provided with a second clamping tooth 2.2 and a second mounting groove 2.3 from outside to inside, the first clamping tooth 1.2 and the second clamping tooth 2.2 are respectively provided with a toothed protrusion, and a plastic pipe with a larger size can be clamped between the first clamping tooth 1.2 and the second clamping tooth 2.2.

One side of the upper locking ring 1 is provided with a compression block 1.4, the other side of the upper locking ring 1 is provided with a fixed block 1.5, the cross section of the fixed block 1.5 is fan-shaped, the outer side of the compression block 1.4 is provided with a longitudinal U-shaped through groove, the side of the fixed block 1.5 is provided with a plurality of fixing holes 1.51, one side of the lower locking ring 2 is provided with a first rotating block 2.5, the other side of the lower locking ring 2 is provided with a second rotating block 2.6, the cross section of the second rotating block 2.5 is fan-shaped, the side surface of the first rotating block 2.5 is provided with a through hole, the outer side of the first rotating block 2.5 is provided with a longitudinal U-shaped through groove, the compression screw 8 is arranged in the U-shaped through groove of the first rotating block 2.5, as shown in fig. 7, the compression screw 8 comprises a screw head 8.1, the top of the screw head 8.1 is arc-shaped, when the screw head 8.1 is arranged in the through hole on the side surface of the first rotating block 2.5, the screw head 8.5 can rotate in the U-shaped through groove, the screw head part of the compression screw head 8 rotates to the U-shaped through groove of the first rotating block 2.5, the screw head 4 can not rotate to the compression screw head 1 or the screw nut can move in the U-shaped through groove, and the compression screw nut can not move in the side of the screw head 1 or the compression ring.

The bottom of lower locking ring 2 is equipped with mount pad 2.4, and the cross-section of mount pad is T shape, and the bottom outside of mount pad is equipped with a plurality of locating holes 2.43, and locating hole 2.43 symmetry sets up, and mount pad 2.4 bottom center is equipped with recess 2.41, and the center of recess 2.41 is equipped with mounting hole 2.42.

As shown in fig. 5, a set of slips 6 is provided, the slips 6 are in a semicircular structure, the sizes of the slips 6 are matched with the sizes of the first mounting groove 1.3 and the second mounting groove 2.3, the slips 6 are installed in the first mounting groove 1.3 and the second mounting groove 2.3, the inner ring of each slip 6 is provided with a third clamping tooth 6.1, when the pipe diameter of a plastic pipe is smaller, each slip 6 is installed in the first mounting groove 1.3 and the second mounting groove 2.3 to be locked, the outer ring of each slip 6 is provided with a U-shaped locking groove 6.2, a first locking hole 1.11 is formed in the first clamping part 1.1 corresponding to each locking groove 6.2, a second locking hole 2.11 is formed in the second clamping part 2.1, the upper locking ring 1 is provided with the first mounting groove 1.6 in the first locking hole 1.11, the lower locking ring 2 is provided with the second mounting groove 2.7 in the second locking hole 2.11, and the slips 6 are fixed on the first locking hole 1.11 and the second locking hole 2.11 through the locking groove 6.2 by bolts.

As shown in fig. 6, the connecting plate 7 is in a sheet shape, two ends of the connecting plate 7 are respectively provided with a second screw hole 7.2 and a plurality of first screw holes 7.1, the second screw holes 7.2 are fixed with the rotating holes 2.61, the plurality of first screw holes 7.1 are in one-to-one correspondence with the plurality of fixing holes 1.51, and the intervals and positions of the second screw holes 7.2 and the first screw holes 7.1 partially meet the requirement that the upper locking ring 1 rotates around the rotating holes 2.61 and the lower locking ring 2.

As shown in fig. 8, the slider 4 is provided in the jig base plate 3, and the position of the slider 4 is adjusted by the adjusting screw 5, and the position of the adjusting screw 5 is not changed with respect to the position of the jig base plate 3.

As shown in fig. 9, the clamp bottom plate 3 is of a flat cuboid structure, a plurality of adjusting holes 3.4 and a plurality of limiting holes 3.5 are formed in the clamp bottom plate 3 in a central symmetry manner, the adjusting holes 3.4 are strip-shaped holes, bolts can move in the adjusting holes 3.4, the lower locking ring 2 and the clamp bottom plate 3 are movably fixed through the adjusting holes 3.4 and the positioning holes 2.43, a sliding groove 3.1 is formed in the center of the clamp bottom plate 3, the sliding groove 3.1 is smooth in surface, the sliding blocks 4 are arranged in the sliding groove 3.1, a first carrying groove 3.2 and a second carrying groove 3.3 are formed in the tops of two sides of the sliding groove 3.1 respectively, the size of the first carrying groove 3.2 is larger than that of the second carrying groove 3.3, and adjusting screws 5 of different sizes can be placed in different carrying grooves to cope with different plastic pipe centering scenes, such as plastic pipe centering by walls can adopt small adjusting screws 5.

As shown in fig. 10 and 11, a locking hole 4.1 is formed in the center of the top of the sliding block 4, a round nut groove 4.2 is correspondingly formed in the bottom of the sliding block 4, the size of the sliding block 4 is matched with the sizes of the sliding groove 3.1 and the groove 2.41, during installation, a nut is placed in the nut groove 4.2, the sliding block 4 and the lower locking ring 2 are fixed through the locking hole 4.1 and the mounting hole 2.42, a first carry hole 4.3 and a second carry hole 4.4 are respectively formed in two sides of the sliding block 4, the size of the first carry hole 4.3 is larger than that of the second carry hole 4.4, when the bottom of the sliding block 4 is in surface contact with the sliding groove 3.1, the first carry hole 4.3 corresponds to the first carry groove 3.2, and the second carry hole 4.4 corresponds to the second carry groove 3.3.

As shown in fig. 12, the adjusting screw 5 is composed of an adjusting knob 5.1 and a positioning rod 5.2, the tail of the positioning rod 5.2 is a long enough threaded rod, the head of the threaded rod of the positioning rod 5.2 is provided with a rotary ring, the head of the positioning rod 5.2 is provided with a limit ring, the rotary ring of the positioning rod 5.2 is matched with the shape of the edge of the sliding groove 3.1, the rotary ring of the positioning rod 5.2 can rotate at the contact position of the sliding groove 3.1 and the carry groove, the limit ring of the positioning rod 5.2 can enable the whole positioning rod 5.2 not to relatively displace with the clamp bottom plate 3, the adjusting screw 5 rotates around the central axis in the carry groove, the threaded rod of the positioning rod 5.2 is arranged in the carry hole, and the sliding block 4 and the clamp bottom plate 3 are relatively displaced under the driving of the rotation of threads, so that the centering clamp can be transversely adjusted.

Example 2:

An adjustable centering fixture, comprising: the upper locking ring 1 and the lower locking ring 2 are rotatably connected through two connecting plates 7, the bottom of the lower locking ring 2 is fixedly provided with a sliding block 4, the bottom of the lower locking ring 2 is slidably connected with a clamp bottom plate 3, the sliding block 4 is slidably connected with the clamp bottom plate 3, and the sliding block 4 is connected with an adjusting screw 5.

The upper locking ring 1 and the lower locking ring 2 are of two semicircular annular structures which can be matched with each other, the upper locking ring 1 and the lower locking ring 2 form a complete clamping locking ring part, the inner ring of the upper locking ring 1 is provided with a first clamping part 1.1, the inner ring of the lower locking ring 2 is provided with a second clamping part 2.1, the inner ring of the first clamping part 1.1 is symmetrically provided with two first clamping teeth 1.2 and two first mounting grooves 1.3 from outside to inside, the inner ring of the second clamping part 2.1 is symmetrically provided with two second clamping teeth 2.2 and two second mounting grooves 2.3 from outside to inside, tooth-shaped protrusions are respectively arranged on the first clamping teeth 1.2 and the second clamping teeth 2.2, and a plastic pipe with a larger size can be clamped between the first clamping teeth 1.2 and the second clamping teeth 2.2.

One side of the upper locking ring 1 is provided with a compression block 1.4, the other side of the upper locking ring 1 is provided with a fixed block 1.5, the section of the fixed block 1.5 is fan-shaped, the outer side of the compression block 1.4 is provided with a longitudinal U-shaped through groove, the side edge of the fixed block 1.5 is provided with two fixed holes 1.51, one side of the lower locking ring 2 is provided with a first rotating block 2.5, the other side of the lower locking ring 2 is provided with a second rotating block 2.6, the section of the second rotating block 2.5 is fan-shaped, the side surface of the first rotating block 2.5 is provided with a through hole, and the outer side of the first rotating block 2.5 is provided with a longitudinal U-shaped through groove.

The bottom of lower locking ring 2 is equipped with mount pad 2.4, and the cross-section of mount pad is T shape, and the bottom outside of mount pad is equipped with two locating holes 2.43, and locating hole 2.43 central symmetry sets up, and mount pad 2.4 bottom center is equipped with recess 2.41, and the center of recess 2.41 is equipped with mounting hole 2.42.

The fixture bottom plate 3 is of a flat cuboid structure, four adjusting holes 3.4 and four limiting holes 3.5 are formed in the fixture bottom plate 3 in a central symmetry mode, the adjusting holes 3.4 are strip-shaped holes, bolts can move in the adjusting holes 3.4, the lower locking ring 2 and the fixture bottom plate 3 are movably fixed through the adjusting holes 3.4 and the positioning holes 2.43, a sliding groove 3.1 is formed in the center of the fixture bottom plate 3, the surface of the sliding groove 3.1 is smooth, the sliding block 4 is arranged in the sliding groove 3.1, a first carrying groove 3.2 and a second carrying groove 3.3 are formed in the tops of two sides of the sliding groove 3.1 respectively, the size of the first carrying groove 3.2 is larger than that of the second carrying groove 3.3, adjusting screws 5 of different sizes can be placed in different carrying grooves, and can be used for coping with different plastic pipe centering scenes, such as plastic pipe centering by walls, and small adjusting screws 5 can be adopted.

The center of the top of the sliding block 4 is provided with a locking hole 4.1, the bottom of the sliding block 4 is correspondingly provided with a round nut groove 4.2, the size of the sliding block 4 is matched with the sizes of the sliding groove 3.1 and the groove 2.41, a nut is placed in the nut groove 4.2 during installation, the sliding block 4 and the lower locking ring 2 are fixed through the locking hole 4.1 and the mounting hole 2.42, two sides of the sliding block 4 are respectively provided with a first carry hole 4.3 and a second carry hole 4.4, the size of the first carry hole 4.3 is larger than that of the second carry hole 4.4, when the bottom of the sliding block 4 is contacted with the surface of the sliding groove 3.1, the first carry hole 4.3 corresponds to the position of the first carry groove 3.2, and the second carry hole 4.4 corresponds to the position of the second carry groove 3.3.

The adjusting screw 5 comprises adjusting knob 5.1 and adjusting lever 5.2, the afterbody of adjusting lever 5.2 is long enough threaded rod, the head of adjusting lever 5.2 threaded rod is equipped with rotatory ring, the head of adjusting lever 5.2 is equipped with spacing ring, the rotatory ring shape of adjusting lever 5.2 and the shape looks adaptation of spout 3.1 edge, the rotatory ring of adjusting lever 5.2 can be rotatory in spout 3.1 and carry groove contact position, the spacing ring of adjusting lever 5.2 can make adjusting lever 5.2 wholly do not take place relative displacement with anchor clamps bottom plate 3, adjusting screw 5 rotates around the axis in carry groove, the threaded rod setting of adjusting lever 5.2 is in the carry hole, slider 4 takes place relative displacement with anchor clamps bottom plate 3 under the rotatory drive of screw thread, make centering anchor clamps can transversely adjust.

The slips 6 are of semicircular structures, the sizes of the slips 6 are matched with the sizes of the first mounting groove 1.3 and the second mounting groove 2.3, the slips 6 are mounted in the first mounting groove 1.3 and the second mounting groove 2.3, the inner ring of each slip 6 is provided with a third clamping tooth 6.1, when the pipe diameter of a plastic pipe is smaller, the slips 6 are mounted in the first mounting groove 1.3 and the second mounting groove 2.3 for locking, the outer ring of each slip 6 is provided with a U-shaped locking groove 6.2, the corresponding locking groove 6.2 is provided with a first locking hole 1.11 on the first clamping part 1.1, the second clamping part 2.1 is provided with a second locking hole 2.11, the upper locking ring 1 is provided with a first mounting groove 1.6 at the first locking hole 1.11, the lower locking ring 2 is provided with a second mounting groove 2.7, the two groups of four slips 6 are respectively fixed on two sides of the first locking hole 1.11 and the second locking hole 2.11 through the locking groove 6.2 by bolts, and the mounting of the slips 6 is completed.

The connecting plate 7 is in a sheet shape, two ends of the connecting plate 7 are respectively provided with a second screw hole 7.2 and two first screw holes 7.1, the second screw holes 7.2 are fixed with the rotating holes 2.61, the two first screw holes 7.1 are in one-to-one correspondence with the two fixing holes 1.51, and the space and the position between the second screw holes 7.2 and the first screw holes 7.1 partially meet the condition that the upper locking ring 1 rotates around the rotating holes 2.61 and the lower locking ring 2.

The compression screw 8 is installed in the U-shaped through groove of the first rotating block 2.5, the compression screw 8 comprises a screw head 8.1, the top of the screw head 8.1 is arc-shaped, the screw head 8.1 can rotate in the U-shaped through groove of the first rotating block 2.5 when installed in the through hole on the side face of the first rotating block 2.5, the threaded part of the compression screw 8 rotates to the U-shaped through groove on the outer side of the compression block 1.4, and the compression screw 8 is rotationally compressed at the top of the compression block 1.4 by a nut or a screw cap, so that the locking ring can lock the plastic pipe and cannot move.

Based on the above embodiment, the application provides an adjustable centering fixture, wherein an upper locking ring 1 and a lower locking ring 2 jointly form a locking ring part of the centering fixture, the upper locking ring 1 and the lower locking ring 2 can rotate around a connecting plate 7 under the action of the connecting plate 7, the lower locking ring 2 is tightly locked through a compression screw 8 during clamping, the bottom of the lower locking ring 2 is connected with a sliding block 4, a fixture bottom plate 3 and a transverse adjusting part formed by an adjusting screw 5, after the two centering fixtures are integrally installed on a fixture centering sliding rail, the locking ring part can be transversely adjusted through the adjusting screw 5, the fixture centering sliding rail can longitudinally adjust the whole centering fixture, at the moment, the next step of plastic pipe centering can be completed, the next step of welding is performed, and the two-axis adjustment is realized by matching with the sliding rail, so that the accurate centering is realized, the working efficiency is improved, the adjusting can also be carried out according to different application scenes and requirements, and wider applicability is realized.

The foregoing has shown and described the basic features, principles, and advantages of the utility model. It should be noted that the present utility model is not limited to the above-described embodiments, but is only limited to a few embodiments, and modifications and additions can be made thereto without departing from the spirit and scope of the utility model.

Claims (10)

1. An adjustable centering fixture, comprising: go up locking ring (1) and lower locking ring (2), go up locking ring (1) with lower locking ring (2) are connected through connecting plate (7), slider (4) and anchor clamps bottom plate (3) are installed to lower locking ring (2) bottom, slider (4) are connected with adjusting screw (5).

2. An adjustable centering fixture as claimed in claim 1, wherein: the upper locking ring (1) is of a semicircular structure, a first clamping part (1.1) is arranged on the inner ring of the upper locking ring (1), first clamping teeth (1.2) and first mounting grooves (1.3) are arranged on the first clamping part (1.1), and first locking holes (1.11) are formed in the first clamping part (1.1).

3. An adjustable centering fixture as claimed in claim 2, wherein: the lower locking ring (2) is of a semicircular structure, the lower locking ring (2) is matched with the upper locking ring (1), a second clamping part (2.1) is arranged on the inner ring of the lower locking ring (2), second clamping teeth (2.2) and second grooves (2.3) are arranged on the second clamping part (2.1), and second locking holes (2.11) are formed in the second clamping part (2.1).

4. An adjustable centering fixture as claimed in claim 3, wherein: the upper locking ring (1) and the lower locking ring (2) are respectively provided with a fixed block (1.5) and a second rotating block (2.6) on the same matching side, and the other matching side of the upper locking ring (1) and the lower locking ring (2) is respectively provided with a compressing block (1.4) and a first rotating block (2.5).

5. An adjustable centering fixture as claimed in claim 4, wherein: be equipped with a plurality of fixed orificess (1.51) on fixed block (1.5), be equipped with the through-hole on first rotatory piece (2.5), be equipped with rotatory hole (2.61) on second rotatory piece (2.6), be connected with compression screw (8) on first rotatory piece (2.5), screw head (8.1) of compression screw (8) with first rotatory piece (2.5) swivelling joint.

6. An adjustable centering fixture as claimed in claim 5, wherein: the connecting plate (7) is provided with a plurality of first screw holes (7.1) and second screw holes (7.2), and the number of the first screw holes (7.1) is the same as the number of the fixing holes (1.51).

7. An adjustable centering clamp as claimed in any one of claims 1 to 6, wherein: the bottom of the lower locking ring (2) is provided with a mounting seat (2.4), the bottom of the mounting seat is provided with a groove (2.41) and a plurality of positioning holes (2.43), the groove (2.41) is internally provided with a mounting hole (2.42), the clamp bottom plate (3) is provided with a plurality of adjusting holes (3.4) and a plurality of limiting holes (3.5), and the adjusting holes (3.4) correspond to the positioning holes (2.43).

8. The adjustable centering fixture of claim 7, wherein: the sliding block (4) is provided with a locking hole (4.1) and a nut groove (4.2), the sliding block (4) is connected with the mounting seat (2.4) through the locking hole (4.1) and the mounting hole (2.42), and two sides of the sliding block (4) are respectively provided with a first carry hole (4.3) and a second carry hole (4.4).

9. The adjustable centering fixture of claim 8, wherein: be equipped with spout (3.1) on anchor clamps bottom plate (3), be equipped with in spout (3.1) slider (4), anchor clamps bottom plate (3) both sides are equipped with first carry groove (3.2) and second carry groove (3.3) respectively, adjusting screw (5) are including adjust knob (5.1) and positioning rod (5.2), positioning rod (5.2) set up in first carry groove (3.2), positioning rod (5.2) with first carry hole (4.3) are connected.

10. An adjustable centering clamp as claimed in any one of claims 3 to 6, wherein: the novel clamping device is characterized in that a slip (6) is arranged in each of the first mounting groove (1.3) and the second mounting groove (2.3), a third clamping tooth (6.1) is arranged on the inner ring of the slip (6), a locking groove (6.2) corresponding to the first locking hole (1.11) and the second locking hole (2.11) is arranged on the outer ring of the slip (6), and a first mounting groove (1.6) and a second mounting groove (2.7) are respectively arranged on the upper locking ring (1) and the lower locking ring (2) corresponding to the locking groove (6.2).