CN217513367U - Supporting and jacking type plane positioning clamping equipment - Google Patents

Abstract

The utility model aims to provide a supporting type plane positioning clamping device, which comprises a clamping assembly for connecting and fixing two cylindrical pipe fittings side by side to form a whole workpiece group, a first positioning reference block and a second positioning reference block, one side of the first positioning reference block is provided with a first supporting and limiting part which is used for abutting against and jointing with one end of the cylindrical pipe fitting, the other side of the second positioning reference block is provided with a second supporting top limit part which is used for abutting against and jointing with the other end of the cylindrical pipe fitting, the second supporting top limiting part can perform reciprocating translational motion along the horizontal direction, and each supporting top part on the first supporting top limiting part and the second supporting top limiting part which are positioned on two sides corresponds to the positioning part on the whole workpiece group, and can determine a positioning plane for positioning the whole workpiece group.

Description

Supporting and jacking type plane positioning clamping equipment

Technical Field

The utility model relates to a work piece presss from both sides dress location apparatus field specifically is a prop up formula plane location and press from both sides dress equipment.

Background

As a widely used workpiece shape, common parts and products of various mechanical equipment such as a transmission shaft, a support rod and the like are cylindrical, and various requirements can be generated on the processing technique and the requirements of cylindrical pipe fittings aiming at different application fields such as milling, punching, grooving, surface spraying and etching. In order to achieve efficient and accurate processing effect, an important problem to be considered in each processing procedure of the cylindrical pipe fitting is how to stably and reliably position and fix the workpiece. In various practical application scenarios, some relatively reliable fixing and positioning modes and corresponding positioning and machining tools for cylindrical pipe fittings have appeared.

For example, application number is CN 201821088744.3's chinese utility model patent document discloses a cylindrical pipe fitting processing frock of driling, belong to machining technical field, the on-line screen storage device comprises a base, be equipped with two V-arrangement piece fixture and a three-jaw chuck on the base, two V-arrangement piece fixture include V-arrangement piece and lower V-arrangement piece, V-arrangement piece lower extreme is equipped with the mount pad down, two V-arrangement piece fixture pass through the mount pad bolt and install on the base, V-arrangement piece upper end is equipped with door shape frame down, T-arrangement guide rail two has all been seted up on two medial surfaces of door shape frame, the both sides of going up the V-arrangement piece are equipped with T-arrangement slider two, it installs between two T-arrangement guide rail two to go up the V-arrangement piece through T-arrangement slider two, it is equipped with the screw rod to pass door shape frame and last V-arrangement piece, the screw rod top is equipped with handle two, respectively be equipped with two supporting shoes on the medial surface of last V-arrangement piece and lower V-arrangement piece. The tool is used for processing the cylindrical pipe fittings of different sizes in a rotating mode, can be completed by a single person, and is convenient to operate, reliable and accurate in limiting and high in drilling precision.

Still like the clamping frock of the cylindrical pipe fitting of high accuracy as disclosed in the chinese utility model patent application document of application number CN201520663250.3, include the connecting plate that links to each other with the grinding machine tailstock, it is top to be provided with the horizontally tailstock on the connecting plate, still includes the headstock top that the level that links to each other with the grinding machine head frame set up, be provided with first force sensor on the headstock top, be provided with second force sensor on the tailstock top, first force sensor, second force sensor link to each other with the singlechip respectively, the singlechip links to each other with the display, be used for the cylindrical pipe fitting of clamping between headstock top and the tailstock top. The clamping tool can ensure that the clamping effect error is small in the machining process so as to meet the high-precision machining requirement, and meanwhile, whether the cylindrical pipe fitting displaces or not under the action of cutting force can be found conveniently and timely.

Among the foretell technical scheme, the stable dress effect of pressing from both sides of cylindrical pipe fitting that has all realized, but consider machining efficiency, carry out solitary clamping and dismantlement to cylindrical pipe fitting and often can waste time and energy, owing to the great machining error can be brought in the dismouting of relapseing, consequently at the in-process of actual production processing, often adopt a plurality of cylindrical pipe fittings to press from both sides the fixed form of dress side by side simultaneously. In addition, the general milling and slotting tool bit is limited by the arrangement of a mechanical structure, and can only process one side surface of a workpiece, and the tool bit needs to be turned over after the locking and fixing of the workpiece is released so as to process the other side surface of the cylindrical pipe fitting. At this moment, due to the intervention of turning action, the rotation angle position of the single cylindrical pipe fitting is difficult to control, and deflection errors occur among a plurality of cylindrical pipe fittings which need to rotate synchronously, so that relative machining errors occur among workpieces, and further the quality of the workpieces is reduced or even the workpieces are damaged.

To the problem, the utility model provides a can realize the stable and reliable formula plane location clamping equipment that props up of synchronous processing simultaneously to a plurality of cylindrical pipe fittings.

Disclosure of Invention

The utility model provides a can realize the stable and reliable formula plane location clamp equipment of propping up of synchronous processing simultaneously to a plurality of cylindrical pipe fittings.

The above technical object of the present invention can be achieved by the following technical solutions:

the utility model provides a prop up a formula plane location and press from both sides dress equipment, includes and is used for connecting two cylindrical pipe fittings side by side fixed formation work piece group holistic clamp dress subassembly, still includes first location reference block and second location reference block, one side of first location reference block be provided with be used for with the one end of cylindrical pipe fitting offsets by the first locating part that props up of laminating, the opposite side of second location reference block be provided with be used for with the other end of cylindrical pipe fitting offsets by the second locating part that props up of laminating, second prop up the locating part and can carry out reciprocating translation motion along the horizontal direction, lie in each top on the first locating part of propping up and the second locating part of both sides with work piece group is whole to be corresponding to can confirm one be used for right work piece group wholly carries out the location plane of fixing a position.

As right the utility model discloses a preferably, still include for two cylindrical pipe fittings with two pairs of toper group that sets up side by side of corresponding form, the same to include in the toper group of propping up the top set up respectively in two toper top portions on first top locating part and the second top locating part, these two the toper top portion is protruding to cylindrical pipe fitting one side with opposite orientation along the horizontal direction.

As to the utility model discloses an it is preferred, by two pairs that set up side by side the location processing plane that twice the central axis that contains formed in the toper branch top group parallels with the horizontal plane.

As right the utility model discloses a preferred, offer on the toper branch top and be used for avoiding taking place the contact with the processing cutter and interfere dodging the notch.

As right the utility model discloses a preferably, press from both sides dress subassembly include be used for set up respectively in the punch holder of cylindrical pipe spare top with the lower plate of cylindrical pipe spare below still include be used for with punch holder and lower plate lock the whole threaded fastener who forms a workpiece group for cylindrical pipe spare.

As right the utility model discloses a preferably, state that second props up top locating part still swing joint and installs and be used for control the second props up the locating part and carries out reciprocating motion and realize right cylindrical pipe spare presss from both sides the fixed drive assembly, drive assembly include with second location reference piece looks fixed connection's base portion to and through articulated mode with one end with base portion swing joint's actuating lever, the middle part section of actuating lever with it has the connecting rod still to have a movable mounting between the second props up the locating part, the both ends of connecting rod respectively with second props up top locating part and actuating lever is connected with articulated mode, makes the actuating lever can drive when carrying out forward and reverse rotation around the hinge center of its tip the second props up the locating part and carries out reciprocating translation motion.

As right the utility model discloses a preferred, second back-up locating part with still be provided with locking subassembly between the second location reference block, be used for preventing in the course of working second back-up locating part takes place not hard up to lead to losing right cylindrical pipe spare restraint fixed effect.

Preferably, the anti-loosening locking assembly includes a locking connecting section formed by a protrusion on the second supporting top limiting part and having a thread on the surface, and a locking nut corresponding to the locking connecting section, a through hole for the locking connecting section to pass through is formed on the second positioning reference block, and the radial dimension of the locking nut is greater than the through hole; the locking connecting section passes behind the perforating hole will locking nut closes soon and installs on the locking connecting section to realize preventing through the locking nut with the effect of the support between the second top locating part terminal surface that the cylindrical pipe fitting is not hard up.

As right the utility model discloses a preferred, locking subassembly still includes a locking piece that has the inclined plane, the block groove that extends from bottom to top is seted up to the locking piece, makes the locking piece can cup joint from top to bottom install in on the locking linkage segment and be in lock nut carries out to close soon and is pressed from both sides tightly between lock nut and second location reference block when fixed, still be formed with the spigot surface corresponding with this inclined plane on the second location reference block.

To sum up, the utility model discloses following a plurality of beneficial effect can be realized:

1. prop up top formula plane location and press from both sides dress equipment and press from both sides two cylindrical pipe fittings through one kind and dress the subassembly and form a whole, can cut or punch the whole that will include two cylindrical pipe fittings after handling to the side of going up of two cylindrical pipe fittings simultaneously and overturn to the downside that the cutting tool bit subassembly can't reach under the preceding fixed state overturns to the top again, can also keep two work pieces to carry out the multistage processing that relapses under the relative position condition that does not change steadily and reliably in this journey.

2. Prop up a formula plane location and press from both sides dress equipment and utilized the inside centre bore of seting up along the axial of cylindrical pipe fitting self, through the cooperation effect of propping up between toper top and the centre bore, the work piece of multiple inside aperture size can all press from both sides the dress location and can not receive the restriction of work piece shape and size, can realize reliable and stable central location effect, has very extensive application prospect.

3. The utility model discloses a prop up formula planar positioning and press from both sides dress equipment on the basis of positioning two independent cylindrical pipe fittings central authorities simultaneously, contact the central axis of two pipe fittings to form a processing location plane of being limited by two central axes and obtaining, this kind of diaxon confirms the form of planar positioning and forging a job, especially for the flat processing of milling of metal work piece, has guaranteed effectively that the positive and negative two processing face have high depth of parallelism between; in addition, this frock can also realize carrying out accurate control to the aforesaid processing locating plane for the contained angle size that the horizontal plane formed through controlling the relative difference in height between two pairs of toper back-off groups, makes two cylindrical pipe fittings have higher adaptability and flexibility when carrying out the differentiation processing at the same moment.

4. Prop up a formula plane location and press from both sides dress equipment when placing cylindrical pipe fitting between two toper tops, only need control drive assembly to drive and shorten the interval between two toper tops until pressing from both sides cylindrical pipe fitting tightly, just can utilize the cooperation effect between toper top and the pipe fitting centre bore, it is fixed to carry out locking cylindrical pipe fitting lifting to target altitude position conveniently, realized very laborsavingly that it is fixed to press from both sides the dress and the unblock is separated switching between two kinds of states cylindrical pipe fitting, it is high-efficient convenient.

5. Prop up and contain among the formula plane location and press from both sides dress equipment and be used for accomplishing the fixed back of locking to cylindrical pipe fitting, avoid milling flat, punch or when the surface is polished and is handled because the vibration leads to losing the locking effect to the work piece, ensure the safe and reliable of whole course of working.

6. Prop up locking subassembly among formula plane location clamping equipment still include one and install the wedge slider between lock nut and second location reference block, through shape and roughness's control to looks butt inclined plane between this wedge slider and the second location reference block, can rotate under the circumstances of locking not influencing lock nut, extract the wedge slider immediately even the second props up the locating part and obtains outside removal space clearance fast dismantling, be convenient for take off cylindrical pipe spare rapidly and change the installation.

Drawings

Fig. 1 is a schematic view of the overall structure of a supporting top type plane positioning clamping device when clamping a workpiece;

fig. 2 is a schematic side view structure diagram of the prop type plane positioning clamping device when clamping a workpiece;

FIG. 3 is a schematic view of the connection between the clamping assembly and the cylindrical pipe;

FIG. 4 is a schematic diagram of the overall structure relationship among the second positioning reference block, the second supporting top limiting member connected to the second positioning reference block, the driving assembly, and the anti-loosening locking assembly;

fig. 5 is a schematic side view structural relationship diagram of the second positioning reference block, the second supporting top limiting member connected to the second positioning reference block, the driving assembly, and the anti-loosening locking assembly.

In the figure:

1-cylindrical pipe fitting;

2-clamping assembly, 2 a-upper clamping plate, 2 b-lower clamping plate, 2 c-threaded fastener;

3-bearing base platform, 3 a-adjusting guide groove;

4-first positioning reference block, 4 a-first supporting top limit piece;

5-a second positioning reference block, 5 a-a second supporting top limit piece;

6-the top of the conical branch, 6 a-the avoiding notch;

7-drive assembly, 7 a-base portion, 7 b-drive rod, 7 c-connecting rod;

8-anti-loose locking assembly, 8 a-locking connecting section, 8 b-locking nut, 8 c-locking block, 801-clamping groove.

Detailed Description

The following specific examples are given by way of illustration only and not by way of limitation, and it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made in the examples without inventive faculty, and yet still be protected by the scope of the claims.

The scheme is realized by the following technical means:

example (b): in this embodiment, a supporting type plane clamping device for the special cylindrical pipe fitting 1 is provided, and stable and reliable synchronous processing can be simultaneously realized on a plurality of cylindrical pipe fittings 1.

Specifically, the top-supported planar clamping device firstly comprises a clamping assembly 2 for fixing a plurality of cylindrical pipe fittings 1 side by side. The clamping assembly 2 mainly comprises an upper clamping plate 2a arranged above the pipe fitting, a lower clamping plate 2b arranged below the pipe fitting and a threaded fastener 2c used for connecting and fixing the upper clamping plate 2a and the lower clamping plate 2b with the two cylindrical pipe fittings 1. A concave V-shaped notch is formed in the upper clamping plate 2a or the lower clamping plate 2b, and when the cylindrical pipe fitting 1 is arranged between the upper clamping plate 2a and the lower clamping plate 2b, the outer wall surface of the cylindrical pipe fitting 1 is abutted against and attached to the upper clamping plate 2a and the lower clamping plate 2b at least at three points to realize fixation; and when the cylindrical pipe fitting 1 who lists in both sides is fixed by punch holder 2a and lower plate 2b looks butt simultaneously, utilize the combination of bolt and nut as threaded fastener 2c simultaneously, pass punch holder 2a and lower plate 2b back in proper order from top to bottom with the bolt and utilize the nut to carry out rotatory locking and fix, just realized fixing two cylindrical pipe fitting 1 lockings as a whole.

As the installation base of the whole supporting and top type plane clamping equipment, the supporting and top type plane clamping equipment comprises a steel bearing base platform 3 which plays a role in bearing, and a first positioning reference block 4 and a second positioning reference block 5 which are upwards protruded are fixedly installed on the bearing base platform 3. It should be noted here that the distance between the two positioning reference blocks must be larger than the length of the cylindrical pipe 1 to be clamped and fixed, so that the two cylindrical pipes 1 fixed as a whole can be inserted between the two positioning reference blocks. And one side of the first positioning reference block 4 close to the cylindrical pipe fitting 1 is provided with a first supporting and limiting part 4a used for abutting against and fitting with one end of the cylindrical pipe fitting 1, and one side of the second positioning reference block 5 close to the cylindrical pipe fitting 1 is provided with a second supporting and limiting part 5a used for abutting against and fitting with the other end of the cylindrical pipe fitting 1. The first top limit stop 4a is connected to the second positioning reference block 5 in a completely fixed manner, and the second top limit stop 5a can move back and forth in the horizontal direction relative to the second positioning reference block 5 to clamp or loosen the cylindrical pipe 1.

Of course, the first supporting top limiting part 4a and the second supporting top limiting part 5a can be processed to form a spherical curved surface protruding to one side of the pipe fitting, and can also form an inner concave arc surface departing from one side of the cylindrical pipe fitting 1, so as to realize the central positioning fixation after the end of the cylindrical pipe fitting 1 is abutted. In the present embodiment, in consideration of the fact that the workpiece to be clamped is a cylindrical pipe fitting, the central hole formed in the workpiece can be fully utilized, and therefore, a structure in which the tapered supporting top portion 6 having a conical shape with a pointed top is respectively disposed on the first supporting top limiting member 4a and the second supporting top limiting member 5a is adopted. Therefore, when the second supporting top limiting part 5a moves towards one side of the first supporting top limiting part 4a, the two groups of conical supporting top parts 6 corresponding to the two cylindrical pipe fittings 1 can be respectively embedded into the two ends of the two cylindrical pipe fittings 1, and complete locking and fixing are realized by utilizing central positioning. Here, taking as an example that the planes defined by the two central axes of the two cylindrical pipe members 1 are arranged in a horizontal state, the two pairs of tapered apexes 6 arranged on both sides should be arranged at the same height, and the central axes of the pair of tapered apexes 6 in the same group coincide. Similarly, if the determined plane is designed to form a certain included angle with the horizontal plane, the height difference between the two pairs of conical branch tops 6 arranged at the two sides can be adjusted and controlled.

Considering that a milling cutter needs to completely remove a part of a tubular workpiece or a hole drilling bit needs to completely penetrate through a tube wall in the actual clamping process, the upper side of the conical branch top part 6 can be partially removed to form an avoidance notch 6a which is concave downwards, so that the interference with a machining tool is avoided. It should be noted here that the relief notch 6a is formed so as not to exceed half of the overall cross-sectional shape of the tapered branch top portion 6 at this position, which would otherwise destroy the stability of the clamping of the branch top portion between the tapered branch top portion 6 and the cylindrical pipe member 1, or even cause the fixture to lose its clamping and fixing effect.

The driving assembly 7 is further installed on the outer side of the second supporting top limiting member 5a, and is only used for controlling the second supporting top limiting member 5a to reciprocate and clamping and fixing the cylindrical pipe fitting 1. The driving assembly 7 includes a base portion 7a fixedly connected to the second positioning reference block 5, and a driving rod 7b movably connected to the base portion 7a at one end thereof in a hinged manner, a connecting rod 7c is movably installed between a middle section of the driving rod 7b and the second supporting top limiting member 5a, and two ends of the connecting rod 7c are respectively connected to the second supporting top limiting member 5a and the driving rod 7b in a hinged manner, so that the driving rod 7b can drive the second supporting top limiting member 5a to perform reciprocating translational movement when rotating forward and backward around a hinge center of an end portion thereof.

Further, an anti-loosening locking assembly 8 is further arranged between the second supporting top limiting piece 5a and the second positioning reference block 5, and is used for preventing the second supporting top limiting piece 5a from loosening in the machining process so as to cause the loss of the restraining and fixing effects on the cylindrical pipe fitting 1. Specifically, the anti-loosening locking assembly 8 includes a locking connection section 8a formed by a protrusion on the second supporting and top limiting member 5a and having a thread on a surface thereof, and a locking nut 8b corresponding to the locking connection section 8a, a through hole for the locking connection section 8a to pass through is formed on the second positioning reference block 5, and a radial dimension of the locking nut 8b is greater than that of the through hole; and after the locking connecting section 8a penetrates through the through hole, the locking nut 8b is screwed and installed on the locking connecting section 8a, so that the effect of preventing the cylindrical pipe fitting 1 from loosening is realized through the abutting action between the locking nut 8b and the end surface of the second supporting and limiting part 5 a. The anti-loose locking assembly 8 further includes a locking block 8c having an inclined surface, the locking block 8c is provided with a locking groove 801 extending from bottom to top, so that the locking block 8c can be sleeved and mounted on the locking connection section 8a from top to bottom and is clamped between the locking nut 8b and the second positioning reference block 5 when the locking nut 8b is screwed and fixed, and the second positioning reference block 5 is further formed with a guide surface corresponding to the inclined surface.

When the cylindrical pipe fitting 1 is clamped and fixed, the driving assembly 7 is utilized to drive the second supporting and limiting part 5a to move to clamp and fix a workpiece, the locking block 8c is kept in the state and is installed on the locking connecting section 8a in a sleeved mode from top to bottom, and then the locking nut 8b is rotated until the locking nut abuts against and fits with the surface of the locking block 8 c. It should be noted here that the weight of the locking block 8c is large, and the abutting relationship between the inclined surface formed on the locking block 8c and the guide surface on the second positioning reference block 5 is enough to maintain self-locking in a state far larger than the clamping acting force, that is, when the second supporting top limiting member 5a clamps the workpiece by pressing with a sufficiently large driving force, the locking block 8c does not slide upward and disengage.

Since the cylindrical pipe 1 to be clamped and positioned has different length and size, the range of the second abutment limiting member 5a is limited, which limits the application of the tool. Therefore, the adjusting guide groove 3a extending in the same direction as the pipe fitting can be formed in the adjusting guide groove 3a bearing base 3, the first positioning reference block 4 or the second positioning reference block 5 is designed to be a movable structure capable of translating along the direction of the adjusting guide groove 3a, and the first positioning reference block 4 or the second positioning reference block 5 is locked and fixed at a certain specific position by using a bolt or a bolt, so that the application range of the supporting top type plane clamping device is remarkably expanded.

While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (9)

1. The utility model provides a prop up formula plane location and press from both sides dress equipment which characterized in that: comprises a clamping assembly (2) for connecting and fixing two cylindrical pipe fittings (1) side by side to form a whole workpiece group, a first positioning reference block (4) and a second positioning reference block (5), one side of the first positioning reference block (4) is provided with a first supporting and limiting part (4 a) which is used for abutting against and jointing with one end of the cylindrical pipe fitting (1), the other side of the second positioning reference block (5) is provided with a second supporting and limiting piece (5 a) which is used for abutting against and jointing with the other end of the cylindrical pipe fitting (1), the second supporting top limiting part (5 a) can perform reciprocating translational motion along the horizontal direction, and each supporting top part on the first supporting top limiting part (4 a) and the second supporting top limiting part (5 a) positioned on two sides corresponds to the positioning part on the whole workpiece group, and can determine a positioning plane for positioning the whole workpiece group.

2. The overhead plane positioning and clamping apparatus of claim 1, wherein: still include for two cylindrical pipe fittings (1) with two pairs of toper set of the corresponding form side by side, include respectively set up in the same pair of toper set of propping two toper prop portions (6) on first prop locating part (4 a) and second prop locating part (5 a), these two toper prop portions (6) with opposite orientation along the horizontal direction to cylindrical pipe fitting (1) one side arch.

3. The overhead plane positioning and clamping apparatus of claim 2, wherein: and a positioning processing plane formed by two central axes contained in the two pairs of conical branch top parts (6) arranged side by side is parallel to the horizontal plane.

4. The overhead plane positioning and clamping apparatus of claim 2, wherein: an avoidance notch (6 a) used for avoiding contact interference with a machining cutter is formed in the conical branch top portion (6).

5. The prop-type planar positioning clamping device according to claim 3, wherein: it includes to press from both sides dress subassembly (2) be used for set up respectively in punch holder (2 a) of cylindrical pipe fitting (1) top with lower plate (2 b) of cylindrical pipe fitting (1) below still include be used for with punch holder (2 a) and lower plate (2 b) lock fixed screw thread fastener (2 c) that form a whole of workpiece group for cylindrical pipe fitting (1).

6. The overhead plane positioning and clamping apparatus of claim 4, wherein: second back crown locating part (5 a) is swing joint still installs and is used for control second back crown locating part (5 a) carries out reciprocating motion and realizes right cylindrical pipe fitting (1) presss from both sides tight fixed drive assembly (7), drive assembly (7) include with base portion (7 a) of second location benchmark piece (5) looks fixed connection to and through articulated mode with one end with base portion (7 a) swing joint's actuating lever (7 b), the middle part section of actuating lever (7 b) with still movable mounting has connecting rod (7 c) between second back crown locating part (5 a), the both ends of connecting rod (7 c) respectively with second back crown locating part (5 a) and actuating lever (7 b) are connected with articulated mode, make actuating lever (7 b) can drive when carrying out forward and reverse rotation around the articulated center of its tip second back crown locating part (5 a) carry out reciprocating motion.

7. The overhead plane positioning and clamping apparatus of claim 5, wherein: and an anti-loosening locking assembly (8) is further arranged between the second supporting top limiting part (5 a) and the second positioning reference block (5) and is used for preventing the second supporting top limiting part (5 a) from loosening in the machining process so as to cause the loss of the restraining and fixing effects on the cylindrical pipe fitting (1).

8. The prop-type planar positioning clamping device according to claim 7, wherein: the anti-loosening locking assembly (8) comprises a locking connecting section (8 a) which is formed by a protrusion on the second supporting top limiting part (5 a) and is provided with threads on the surface, and a locking nut (8 b) corresponding to the locking connecting section (8 a), a through hole for the locking connecting section (8 a) to pass through is formed in the second positioning reference block (5), and the radial size of the locking nut (8 b) is larger than that of the through hole; and after the locking connecting section (8 a) penetrates through the through hole, the locking nut (8 b) is rotatably installed on the locking connecting section (8 a), so that the effect of preventing the cylindrical pipe fitting (1) from loosening is realized through the abutting effect between the locking nut (8 b) and the end surface of the second supporting top limiting part (5 a).

9. The overhead plane positioning and clamping apparatus of claim 7, wherein: locking subassembly (8) still include a locking piece (8 c) that has the inclined plane, block groove (801) that extend from bottom to top are seted up to locking piece (8 c), make locking piece (8 c) from top to bottom cup joint install in on locking linkage segment (8 a) and lock nut (8 b) are pressed from both sides tightly between lock nut (8 b) and second location reference block (5) when closing fixedly soon, still be formed with the spigot surface corresponding with this inclined plane on second location reference block (5).

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