CN117300666A - Thin-wall pipe fitting adds clamping apparatus - Google Patents

Abstract

The invention relates to the field of machining clamps, in particular to a thin-wall pipe fitting machining clamp. The clamping assembly comprises a mounting plate, wherein a plurality of connecting shafts are inserted on the mounting plate, a plurality of clamping plates are inserted on each connecting shaft, clamping plates positioned on the same circumference on all connecting shafts form a clamping assembly, the inner surface of each clamping assembly is provided with a cylindrical surface after the clamping plates of each clamping assembly are closed, the inner diameter of each clamping assembly from being far away from the mounting plate to being close to the mounting plate is gradually increased by the same amplification, and each clamping assembly can clamp a thin-wall pipe fitting within a preset diameter range. According to the invention, the diameters of the thin-wall pipe fittings are graded and correspond to the clamping assemblies, so that the clamping assemblies can basically realize surface contact when the thin-wall pipe fittings are wrapped and clamped, the clamping effect on the thin-wall pipe fittings is improved, and the damage and deformation of the thin-wall pipe fittings are avoided; and meanwhile, the clamping force applied to the clamping plate which is closer to the mounting disc is larger, so that the thin-wall pipe fitting is prevented from being deformed and the clamping is more reliable.

Description

Thin-wall pipe fitting adds clamping apparatus

Technical Field

The invention relates to the field of machining clamps, in particular to a thin-wall pipe fitting machining clamp.

Background

In machining, a conventional jig is often a chuck-type jig, such as a three-jaw chuck, a four-jaw chuck, or the like, when machining shaft-type parts. However, for the thin-wall pipe fitting, only a few stress points exist during clamping, the pipe fitting is easy to deform under the action of clamping pressure and cutting stress of cutting machining, and further the self-centering precision of the thin-wall pipe fitting is greatly reduced, so that the conditions of poor final machining quality of the thin-wall pipe fitting, scrapped parts and the like are likely to occur.

Disclosure of Invention

According to the defects of the prior art, the invention provides a thin-wall pipe fitting machining clamp, which aims to solve the problem that the existing clamp is easy to cause deformation of a pipe fitting when clamping the thin-wall pipe fitting.

The invention relates to a thin-wall pipe fitting machining clamp which adopts the following technical scheme: the device comprises a machine base, wherein a mounting disc is arranged on the machine base, a plurality of connecting shafts are uniformly and uniformly inserted on the mounting disc along the circumferential direction, and the connecting shafts can move inside and outside the radial direction of the mounting disc and can move left and right along the axial direction of the mounting disc;

each connecting shaft is inserted with a plurality of clamping plates, the clamping plates on the same connecting shaft are sequentially connected along the extending direction of the connecting shaft, and a layer of clamping plate closest to the mounting plate is in sliding connection with the mounting plate along the radial direction; clamping plates positioned on the same circumference on all connecting shafts form a clamping assembly, the inner surface of each clamping assembly forms a cylindrical surface after the clamping plates are closed, the inner diameter of the clamping assembly gradually increases from the far mounting disc to the near mounting disc with the same increase, and each group of clamping assemblies can clamp thin-wall pipe fittings within a preset diameter range; the mounting plate is provided with a jacking spring and a limiting piece, the initial jacking spring enables the direction of the connecting shaft, which is close to the center of the mounting plate, to be close, the limiting piece prevents the direction of the connecting shaft, which is close to the center of the mounting plate, from being close, so that each clamping assembly is in an open state, and after the limiting assembly releases the obstruction to the connecting shaft, the connecting shaft moves in the direction, which is close to the center of the mounting plate, so that the clamping assemblies are driven to be closed;

the mounting plate is provided with a plurality of movable frames along the circumferencial direction equipartition, movable frames and connecting axle one-to-one and can follow the radial removal of mounting plate, be provided with supporting spring between movable frames and the mounting plate, initial supporting spring makes movable frames be close to the centre of a circle of mounting plate, connect through first drive mechanism between movable frames and the connecting axle, insert the centre gripping subassembly with thin wall pipe fitting during the use, thin wall pipe fitting is with the radial outside jack-up of movable frames, the movable frames response thin wall pipe fitting's diameter and make the connecting axle keep away from the direction removal of centre gripping subassembly through first drive mechanism, and then make the connecting axle select its extreme of mounting plate one side to be connected with corresponding a set of splint according to the diameter of thin wall pipe fitting.

Optionally, the first transmission mechanism comprises a screw sleeve, a sliding block and a connecting rope; the sliding block is arranged on the mounting plate in a sliding mode and is connected with the jacking spring, a connecting pipe is arranged at one end of the sliding block, the connecting shaft is inserted into the sliding block and the connecting pipe in a sliding mode, the threaded sleeve is sleeved on the connecting shaft and is in threaded connection with the connecting shaft, the threaded sleeve is connected with the connecting pipe in a rotating mode relatively, a torsion spring is arranged between the threaded sleeve and the connecting pipe, the torsion spring enables the threaded sleeve to rotate, the connecting shaft is enabled to axially move along the connecting shaft, the other end of the connecting rope is connected with the other end of the threaded sleeve, and the initial connecting rope is in a tensioning state and further blocks the threaded sleeve from rotating.

Optionally, a pressure rod is arranged on the mounting plate, the pressure rod can slide along the radial direction of the mounting plate, the pressure rod is connected with the outer end of the jacking spring along the radial direction, the pressure rod is connected with the movable frame through a second transmission mechanism, the second transmission mechanism is used for enabling the pressure rod to move inwards along the radial direction of the mounting plate when the movable frame moves outwards along the radial direction of the mounting plate, and the pressure rod is reset when the connecting shaft is separated from the clamping assemblies.

Optionally, the second transmission mechanism comprises a rack and a long gear, the rack is fixedly connected with the movable frame and is in sliding connection with the mounting plate, the long gear is rotationally arranged on the mounting plate, the axis of the long gear is vertical to the rack, one side of the pressure rod is provided with teeth, and the long gear is positioned between the rack and the pressure rod and is meshed with the rack and the pressure rod; the long gear is provided with a non-tooth surface, and the pressure rod resets when the long gear rotates to the non-tooth surface corresponding to the pressure rod.

Optionally, a hollow sleeve is arranged on the mounting plate, the movable frame is inserted in the hollow sleeve in a sliding manner, a long bolt is inserted in the hollow sleeve, the long bolt is inserted in the hollow sleeve and the movable frame and is in threaded connection with the movable frame, and the support spring is sleeved on the long bolt and is propped between the hollow sleeve and the movable frame.

Optionally, a rotating wheel is arranged at one end of the movable frame, which is close to the center of the mounting plate, and the rotating wheel can rotate around the axis of the rotating wheel.

Optionally, the clamping side of the clamping plate has an elastic pad of a predetermined thickness.

Optionally, except the splint at both ends on the same connecting axle, one of them terminal surface of middle splint is provided with the spacing groove, and the spacing groove extends along the radial of splint, and another terminal surface of middle splint is provided with the connection lug, and the connection lug of the splint of internal diameter little among two adjacent splint slides and sets up in the spacing groove of the splint of internal diameter big, in the splint at both ends, and one side of the splint of internal diameter little is provided with the connection lug, and one side of the splint of internal diameter big is provided with the spacing groove, all are provided with the jack that wears on the splint, and the connecting axle slides cartridge in the jack that alternates.

Optionally, the movable frame comprises two threaded loop bars, the two threaded loop bars are connected through a fixed bar, one end of the connecting rope is connected with the fixed bar, and the other end of the connecting rope is connected with the threaded sleeve; two hollow sleeves are arranged on the mounting plate corresponding to each movable frame, the threaded sleeve rod is inserted into the hollow sleeves, and the long bolt is inserted into the hollow sleeves and the threaded sleeve rod.

Optionally, be provided with the mounting panel on the mounting disc, hollow sleeve sets up in the mounting panel, still is provided with flexible post on the mounting disc, and the one end and the mounting panel of flexible post are connected, and the other end and the one deck splint that are closest to the mounting disc of flexible post are connected.

The beneficial effects of the invention are as follows: the invention relates to a thin-wall pipe fitting machining clamp which is provided with a plurality of groups of clamping components, wherein each group of clamping components consists of a plurality of clamping plates, the clamping plates are sequentially inserted on a connecting shaft, the connecting shaft controls the opening and closing of the clamping plates, the inner diameters of the clamping components gradually increase from far from a mounting disc to near to the mounting disc with the same increase, and each group of clamping components clamps the thin-wall pipe fitting within a preset diameter range. According to the invention, the diameters of the thin-wall pipe fittings are graded and correspond to the multiple groups of clamping assemblies, so that the invention can be suitable for thin-wall pipe fittings with different diameters, and the clamping assemblies can basically realize surface contact when the thin-wall pipe fittings are wrapped and clamped, the clamping effect on the thin-wall pipe fittings can be improved by the surface contact, and the damage deformation of the thin-wall pipe fittings is avoided; meanwhile, through diameter grading, the diameter of the thin-wall pipe fitting clamped by the clamping plate which is closer to the mounting disc is larger, and the clamping force received by the clamping plate which is closer to the mounting disc is larger because the force arm is shorter, so that the requirements of different diameters on the clamping force are met, and the clamping is more reliable while the deformation of the thin-wall pipe fitting is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art, it being understood that these drawings are not necessarily drawn to scale.

FIG. 1 is a schematic diagram of the overall structure of a thin-walled tube processing fixture of the present invention;

FIG. 2 is a schematic view of a part of the structure of a thin-walled tube processing fixture according to the present invention;

FIG. 3 is a front view of FIG. 2;

FIG. 4 is a cross-sectional view A-A of FIG. 3;

FIG. 5 is an enlarged view of FIG. 4 at B;

FIG. 6 is a schematic diagram showing the connection of the connecting shaft, the first transmission mechanism, the second transmission mechanism, etc. in the present invention;

FIG. 7 is an exploded view of FIG. 6;

FIG. 8 is a schematic view of the structure of the base and the mounting plate according to the present invention;

fig. 9 is a front view of fig. 8;

FIG. 10 is a cross-sectional view of a base and mounting plate of the present invention;

FIG. 11 is an enlarged view at C in FIG. 10;

FIG. 12 is a left main view of a single cleat (cleat in an intermediate position) of the present invention;

FIG. 13 is a right side view of a single cleat (cleat in an intermediate position) of the present invention;

FIG. 14 is a schematic view of the structure of the long gear of the present invention;

fig. 15 is a schematic structural view of a limiting member in the present invention.

In the figure: 100. a base; 101. a hollow sleeve; 102. a vertical groove; 103. a transverse groove; 104. a first through hole; 105. a second through hole; 106. a hinge shaft; 107. a mounting plate; 108. a telescopic column; 109. a mounting plate; 110. a limiting piece; 111. a substrate; 112. a clamping block; 120. a spring is tightly propped; 200. a clamping plate; 201. penetrating the jack; 202. a limit groove; 203. a connection bump; 204. an elastic pad; 300. a connecting shaft; 400. a movable frame; 401. a rotating wheel; 402. a fixed rod; 403. a threaded sleeve rod; 404. a support spring; 405. a rack; 500. a screw sleeve; 501. a connecting rope; 600. a long bolt; 700. a pressure rod; 800. a long gear; 801. a tooth-free surface; 900. a sliding block; 901. a connecting pipe; 902. and (5) protecting the plate.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 1 to 15, a thin-walled pipe fitting machining fixture of the present invention includes a machine base 100, a mounting plate 109 is provided on the machine base 100, a plurality of connecting shafts 300 are uniformly inserted in the circumferential direction on the mounting plate 109, and the connecting shafts 300 can move radially inward and outward along the mounting plate 109 and can move left and right along the axial direction thereof.

Each connecting shaft 300 is inserted with a plurality of clamping plates 200, and the clamping sides (intrados) of the clamping plates 200 are provided with elastic pads 204 with preset thickness, so that the protection of the thin-wall pipe fitting during clamping is further improved. The clamping plates 200 on the same connecting shaft 300 are sequentially connected along the extending direction of the connecting shaft 300, and a layer of clamping plates 200 closest to the mounting plate 109 are in sliding connection with the mounting plate 109 along the radial direction; all clamping plates 200 positioned on the same circumference on the connecting shaft 300 form a clamping assembly, the inner surface of each clamping assembly forms a cylindrical surface after the clamping plates 200 are closed, the inner diameters of the clamping assemblies gradually increase from the distance from the mounting plate 109 to the distance from the mounting plate 109 with the same increase, and each clamping assembly can clamp thin-wall pipe fittings within a preset diameter range; it should be noted that, the outer arc surface of the clamping plate 200 is a conical surface, and the connecting shaft 300 is inclined, so that the connecting shaft 300 is connected with the clamping plate with gradually increased size. The mounting plate 109 is provided with a jacking spring 120 and a limiting piece 110, the initial jacking spring 120 enables the connecting shaft 300 to approach in the direction close to the center of the mounting plate 109, the limiting piece 110 prevents the connecting shaft 300 from approaching in the direction close to the center of the mounting plate 109 so that each clamping assembly is in an open state, and after the limiting assembly releases the obstruction to the connecting shaft 300, the connecting shaft 300 moves in the direction close to the center of the mounting plate 109 so as to drive the clamping assemblies to be closed.

The mounting plate 109 is provided with a plurality of movable frames 400 along the circumference direction equipartition, movable frames 400 and connecting axle 300 one-to-one and can follow the radial removal of mounting plate 109, be provided with supporting spring 404 between movable frames 400 and the mounting plate 109, initial supporting spring 404 makes movable frames 400 be close to the centre of a circle of mounting plate 109, connect through first drive mechanism between movable frames 400 and the connecting axle 300, insert the clamping assembly with the thin wall pipe fitting during the use, the thin wall pipe fitting is with the radial outwards jack-up of movable frames 400, the diameter of thin wall pipe fitting is responded to movable frames 400 and make connecting axle 300 remove to the direction of keeping away from the clamping assembly through first drive mechanism, and then make connecting axle 300 select its mounting splint 200 one side's extreme (left end in the drawing) according to the diameter of thin wall pipe fitting to be connected with corresponding a set of splint 200. The diameters of the inner peripheral walls of the plurality of clamping plates 200 are preset (the clamping plates 200 are replaceable parts, the diameters of thin-wall pipe fittings which can be clamped according to requirements in actual use are matched with the specifications of the clamping plates 200), the diameters of the inner peripheral walls of the clamping plates 200 gradually increase from the distance from the mounting plate 109 to the distance from the mounting plate 109, each clamping plate 200 can clamp the thin-wall pipe fitting with the diameter in a preset range, the outer diameters of the thin-wall pipe fittings are arranged between the diameters of the first clamping plate 200 and the second clamping plate 200 at the outermost side and the diameters of the thin-wall pipe fittings are all clamped by the first clamping plate 200 in an extrusion mode, and the like. The longer cantilever end (left end in the drawing) of the initial connecting shaft 300 is connected with all clamping plates 200 in a penetrating way, during the process that the movable frame 400 senses the diameter of the thin-walled pipe fitting, the connecting shaft 300 moves away from the clamping assembly, namely, the connecting shaft 300 selects the tail end of the mounting clamping plate 200 to be connected with one group of clamping plates 200 according to the diameter of the thin-walled pipe fitting, for example, the diameter of the thin-walled pipe fitting corresponds to the second group of clamping plates 200 (from far from the mounting disc 109 to near to the mounting disc 109 and from left to right in the drawing), then the connecting shaft 300 moves to be separated from the first group of clamping plates 200, because the inner diameter of the clamping assembly formed by the second group of clamping plates 200 is matched with the diameter of the thin-walled pipe fitting, the second group of clamping plates 200 are used for clamping the thin-walled pipe fitting, and the clamping plates 200 behind the second group of clamping plates 200 are connected with the connecting shaft 300, but the clamping effect is not exerted because the diameter of the clamping plates is larger than the diameter of the thin-walled pipe fitting. The diameters of the thin-wall pipe fittings are graded and correspond to the multiple groups of clamping assemblies, so that the clamping assemblies can basically achieve surface contact when the thin-wall pipe fittings are wrapped and clamped, the clamping effect on the thin-wall pipe fittings can be improved through the surface contact, and the thin-wall pipe fittings are prevented from being damaged. Meanwhile, through diameter grading, the diameter of the thin-wall pipe fitting which can be clamped by the clamping plate 200 which is closer to the mounting disc 109 is larger, and the clamping force which is applied to the clamping plate 200 which is closer to the mounting disc 109 is larger because of the shorter moment arm, so that the requirements of different diameters on the clamping force are met.

Further, as shown in fig. 4, 12 and 13, in order to facilitate connection of the plurality of splints 200 on the same connecting shaft 300, a limiting groove 202 is provided on one end surface of the middle splints 200 except for the splints 200 at both ends on the same connecting shaft 300, the limiting groove 202 extends along the radial direction of the splints 200, a connecting projection 203 is provided on the other end surface of the middle splints 200, the connecting projection 203 of the splints 200 with small inner diameters among the two adjacent splints 200 is slidably disposed in the limiting groove 202 of the splints 200 with large inner diameters, a connecting projection 203 is provided on one side surface of the splints 200 with small inner diameters, a limiting groove 202 is provided on one side surface of the splints 200 with large inner diameters, insertion holes 201 are provided on all splints 200, and the connecting shaft 300 is slidably inserted in the insertion holes 201.

In a further embodiment, as shown in fig. 7, the first transmission mechanism includes a screw sleeve 500, a sliding block 900, and a connecting cord 501; the sliding block 900 is slidably arranged on the mounting disc 109 and is connected with the jacking spring 120, a connecting pipe 901 is arranged at one end of the sliding block 900, the connecting shaft 300 is slidably inserted into the sliding block 900 and the connecting pipe 901, the threaded sleeve 500 is sleeved on the connecting shaft 300 and is in threaded connection with the connecting shaft 300, the threaded sleeve 500 and the connecting pipe 901 are in relative rotation connection, a torsion spring (not shown in the figure) is arranged between the threaded sleeve 500 and the connecting pipe 901, the torsion spring drives the threaded sleeve 500 to rotate so that the connecting shaft 300 moves axially along the connecting shaft, one end of the connecting rope 501 is connected with the threaded sleeve 500, the other end of the connecting rope 501 is connected with the movable frame 400, and the initial connecting rope 501 is in a tensioning state so as to prevent the threaded sleeve 500 from rotating. One end of the connecting pipe 901, which is close to the screw sleeve 500, is provided with a guard plate 902, so that the connecting pipe 901 is connected with the screw sleeve 500 conveniently, and the torsion spring is convenient to install.

Further, as shown in fig. 8, 9 and 12, the mounting plate 109 is provided with a vertical groove 102 and a horizontal groove 103, the sliding block 900 is slidably disposed in the vertical groove 102, the limiting member 110 includes a base plate 111 and a clamping block 112, the clamping block 112 is disposed on one side of the base plate 111, the clamping blocks 112 are uniformly distributed along a circumferential direction of the base plate 111, the base plate 111 is slidably disposed on the base plate 111 along a radial direction thereof, the clamping block 112 is slidably disposed in the horizontal groove 103, the initial clamping block 112 blocks the sliding block 900 from moving, and the clamping block 112 is pulled away from the horizontal groove 103 to allow the sliding block 900 to move after the limiting member 110 moves in a direction away from the clamping assembly.

In a further embodiment, as shown in fig. 5, 6 and 7, the mounting plate 109 is provided with a pressure bar 700, the pressure bar 700 is capable of sliding along the radial direction of the mounting plate 109, the pressure bar 700 is connected to the outer end of the jack spring 120 in the radial direction, the pressure bar 700 is connected to the movable frame 400 through a second transmission mechanism, the second transmission mechanism is used for moving the pressure bar 700 radially inwards of the mounting plate 109 when the movable frame 400 moves radially outwards of the mounting plate 109, and the pressure bar 700 is reset when the connecting shaft 300 is disconnected from one set of clamping assemblies. Through the arrangement of the pressure rod 700 and the second transmission mechanism, after the connecting shaft 300 selects a group of clamping plates 200, the elasticity of the jacking spring 120 can be further adjusted according to the diameter of the thin-wall pipe fitting, and the larger the diameter of the thin-wall pipe fitting is, the larger the jacking force of the jacking spring 120 is.

Further, the second transmission mechanism comprises a rack 405 and a long gear 800, the rack 405 is fixedly connected with the movable frame 400 and is in sliding connection with the mounting plate 109, the long gear 800 is rotatably arranged on the mounting plate 109, the axis of the long gear 800 is vertical to the rack 405, one side of the pressure rod 700 is provided with teeth, and the long gear 800 is positioned between the rack 405 and the pressure rod 700 and is meshed with the rack 405 and the pressure rod 700; the long gear 800 is provided with a non-tooth surface 801, and the pressure bar 700 is reset when the non-tooth surface 801 to which the long gear 800 rotates corresponds to the pressure bar 700. That is, each time the rack 405 rotates the long gear 800, the connecting shaft 300 is separated from the clamping plate 200, and the pressing rod 700 is reset once. Specifically, as shown in fig. 10 and 11, the mounting plate 109 is provided with a first through hole 104 and a second through hole 105, the rack 405 slides through the first through hole 104, the second through hole 105 communicates with the vertical groove 102, and the pressure plate slides through the second through hole 105. The inside of the mounting plate 109 is also provided with a hinge shaft 106, and the long gear 800 is rotatably provided to the hinge shaft 106.

In a further embodiment, the mounting plate 109 is provided with a hollow sleeve 101, the movable frame 400 is slidably inserted into the hollow sleeve 101, a long bolt 600 is inserted into the hollow sleeve 101, the long bolt 600 is inserted into the hollow sleeve 101 and the movable frame 400 and is in threaded connection with the movable frame 400, and the support spring 404 is sleeved on the long bolt 600 and is pressed between the hollow sleeve 101 and the movable frame 400. Through the setting of long bolt 600, after thin wall pipe fitting promotes movable rack 400 in place, rotatory long bolt 600 makes long bolt 600 to be close to the center of mounting disc 109 and remove, wait that the nut of long bolt 600 and hollow sleeve 101 contact, long bolt 600 can't continue to remove, support spring 404 impels the removal of movable rack 400 to the work piece by long bolt 600 to be hindered, and then realize spacing movable rack 400 in the fixed position, movable rack 400 does not have clamping force to thin wall pipe fitting this moment, through the unloading to movable rack 400, can avoid movable rack 400 centre gripping thin wall pipe fitting (be not the face contact between movable rack 400 and the thin wall pipe fitting), the damage that causes to thin wall pipe fitting.

Further, a rotating wheel 401 is arranged at one end of the movable frame 400, which is close to the center of the mounting plate 109, and the rotating wheel 401 can rotate around the axis of the movable frame 400, so that the movable frame 400 can be prevented from scratching the thin-wall pipe fitting by arranging the rotating wheel 401. More specifically, the movable frame 400 includes two screw bars 403, the two screw bars 403 are connected by a fixed bar 402, and the connection shaft 300 passes through a gap between the two screw bars 403 so that the movements of the connection shaft 300 and the movable frame 400 do not affect each other. One end of the connecting rope 501 is connected with the fixed rod 402, and the other end is connected with the screw sleeve 500; two hollow sleeves 101 are arranged on the mounting plate 109 corresponding to each movable frame 400, a threaded sleeve rod 403 is inserted into the hollow sleeves 101, a long bolt 600 is inserted into the hollow sleeves 101 and the threaded sleeve rods 403, and a rotating wheel 401 is rotatably arranged at one end, close to the mounting plate 109, of each threaded sleeve rod 403.

In order to facilitate the installation, the installation plate 107 is provided on the installation plate 109, the hollow sleeve 101 is provided on the installation plate 107, the installation plate 109 is also provided with a telescopic column 108, one end of the telescopic column 108 is connected with the installation plate 107, and the other end of the telescopic column 108 is connected with the layer of clamping plates 200 closest to the installation plate 109.

Hereinafter, the working principle and the use process of the present invention will be described in detail with reference to the above embodiments.

Fig. 1 and fig. 4 show an initial state, in which the limiting member 110 blocks the sliding block 900 from moving in a direction approaching to the center of the mounting plate 109, and the clamping plates 200 are in a stretched state, at this time, the thin-walled pipe fitting is inserted into the middle of the clamping plates 200 and gradually contacts the mounting plate 109, and the corresponding movable frame 400 is jacked up radially outwards (the radial direction approaching to the center of the circle and the radial direction away from the center of the circle) in the process of inserting the thin-walled pipe fitting, wherein the rotating wheel 401 is in a rotating arrangement, so that the thin-walled pipe fitting is prevented from being scratched. During the movement of the movable frame 400 radially outwards, the connecting rope 501 is loosened, after the connecting rope 501 is loosened, the screw sleeve 500 rotates under the action of the torsion spring at the joint of the connecting rope 501 and the guard plate 902 until the connecting rope 501 is straightened, because the screw sleeve 500 is in threaded fit with the connecting shaft 300, the connecting shaft 300 is driven to move rightwards during the rotation of the screw sleeve 500 (fig. 6), that is, the movable frame 400 senses the diameter of the thin-walled pipe fitting, and transmits the sensing result to the connecting shaft 300, the connecting shaft 300 selects the left end of the connecting shaft 300 to be connected with or disconnected from the clamping plates 200, for example, the movable frame 400 senses that the diameter of the thin-walled pipe fitting is between the second clamping plate 200 (the position furthest from the mounting plate 109 is defined as a first clamping plate 200) and the third clamping plate 200 (that is the diameter of the thin-walled pipe fitting is within the clamping range of the second clamping plate 200), and then the connecting shaft 300 moves rightwards to be disconnected from the first clamping plate 200. After the thin-wall pipe is inserted in place, the rotating wheel 401 is tangent to the thin-wall pipe fitting under the action of the supporting spring 404, then the long bolt 600 is screwed, so that the long bolt 600 moves in the direction close to the center of the mounting disc 109 until the upper end of the long bolt 600 contacts with the hollow sleeve 101, the long bolt 600 cannot continue to move, the supporting spring 404 causes the movable frame 400 to move towards a workpiece and is blocked by the long bolt 600, and further the movable frame 400 is limited at a fixed position, and at the moment, the movable frame 400 does not have clamping force on the workpiece.

After the position of the movable frame 400 is fixed, the limiting piece 110 is pulled towards a direction away from the mounting disc 109 (the right side is shown in fig. 4), the limit of the clamping block 112 on the sliding block 900 is released, the sliding block 900 descends to the lowest point of the vertical groove 102 under the action of the jacking spring 120, at this time, the clamping plate 200 is closed, the clamping of the thin-wall pipe fitting is realized, and the clamping force of the clamping plate 200 close to the mounting disc 109 is larger as the moment arm is shorter.

Further, in the clamping process, for the same set of clamping plates 200, the closer the connecting shaft 300 is to the mounting plate 109 on the set of clamping plates 200, the larger the diameter of the thin-walled pipe fitting in the corresponding range is, that is, the diameter of the thin-walled pipe fitting is slightly larger than the diameter of the inner peripheral wall of the set of clamping plates 200, so that the required clamping force is required to be increased correspondingly, in the radial outward moving process of the movable frame 400, the rack 405 moves synchronously, the rack 405 moves to push the long gear 800 to rotate, the long gear 800 rotates to drive the pressure rod 700 to move towards the center of the mounting plate 109, the pressure rod 700 moves towards the center of the mounting plate 109, so that the pressing force is increased due to the compression of the pressing spring 120, when the connecting shaft 300 moves from the current clamping plate 200 to the next clamping plate 200, the long gear 800 is just separated from the pressure rod 700 (the long gear 800 rotates for one circle, the tooth surface 801 is not contacted with the pressure rod 700), the pressure rod 700 returns to the original position, and when the next clamping is performed, the matching pressure is restarted.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims (10)

1. A thin-wall pipe fitting adds clamping apparatus, its characterized in that: the device comprises a machine base, wherein a mounting disc is arranged on the machine base, a plurality of connecting shafts are uniformly and uniformly inserted on the mounting disc along the circumferential direction, and the connecting shafts can move inside and outside the radial direction of the mounting disc and can move left and right along the axial direction of the mounting disc;

each connecting shaft is inserted with a plurality of clamping plates, the clamping plates on the same connecting shaft are sequentially connected along the extending direction of the connecting shaft, and a layer of clamping plate closest to the mounting plate is in sliding connection with the mounting plate along the radial direction; clamping plates positioned on the same circumference on all connecting shafts form a clamping assembly, the inner surface of each clamping assembly forms a cylindrical surface after the clamping plates are closed, the inner diameter of the clamping assembly gradually increases from the far mounting disc to the near mounting disc with the same increase, and each group of clamping assemblies can clamp thin-wall pipe fittings within a preset diameter range; the mounting plate is provided with a jacking spring and a limiting piece, the initial jacking spring enables the direction of the connecting shaft, which is close to the center of the mounting plate, to be close, the limiting piece prevents the direction of the connecting shaft, which is close to the center of the mounting plate, from being close, so that each clamping assembly is in an open state, and after the limiting assembly releases the obstruction to the connecting shaft, the connecting shaft moves in the direction, which is close to the center of the mounting plate, so that the clamping assemblies are driven to be closed;

the mounting plate is provided with a plurality of movable frames along the circumferencial direction equipartition, movable frames and connecting axle one-to-one and can follow the radial removal of mounting plate, be provided with supporting spring between movable frames and the mounting plate, initial supporting spring makes movable frames be close to the centre of a circle of mounting plate, connect through first drive mechanism between movable frames and the connecting axle, insert the centre gripping subassembly with thin wall pipe fitting during the use, thin wall pipe fitting is with the radial outside jack-up of movable frames, the movable frames response thin wall pipe fitting's diameter and make the connecting axle keep away from the direction removal of centre gripping subassembly through first drive mechanism, and then make the connecting axle select its extreme of mounting plate one side to be connected with corresponding a set of splint according to the diameter of thin wall pipe fitting.

2. The thin-walled tube processing fixture of claim 1, wherein: the first transmission mechanism comprises a screw sleeve, a sliding block and a connecting rope; the sliding block is arranged on the mounting plate in a sliding mode and is connected with the jacking spring, a connecting pipe is arranged at one end of the sliding block, the connecting shaft is inserted into the sliding block and the connecting pipe in a sliding mode, the threaded sleeve is sleeved on the connecting shaft and is in threaded connection with the connecting shaft, the threaded sleeve is connected with the connecting pipe in a rotating mode relatively, a torsion spring is arranged between the threaded sleeve and the connecting pipe, the torsion spring enables the threaded sleeve to rotate, the connecting shaft is enabled to axially move along the connecting shaft, the other end of the connecting rope is connected with the other end of the threaded sleeve, and the initial connecting rope is in a tensioning state and further blocks the threaded sleeve from rotating.

3. The thin-walled tube processing fixture of claim 1, wherein: the mounting plate is provided with a pressure rod, the pressure rod can slide along the radial direction of the mounting plate, the pressure rod is connected with the outer end of the jacking spring along the radial direction, the pressure rod is connected with the movable frame through a second transmission mechanism, the second transmission mechanism is used for enabling the pressure rod to move inwards along the radial direction of the mounting plate when the movable frame moves outwards along the radial direction of the mounting plate, and the pressure rod is reset when the connecting shaft is separated from one group of clamping assemblies.

4. A thin-walled tube processing fixture as defined in claim 3, wherein: the second transmission mechanism comprises a rack and a long gear, the rack is fixedly connected with the movable frame and is in sliding connection with the mounting plate, the long gear is rotationally arranged on the mounting plate, the axis of the long gear is vertical to the rack, one side of the pressure rod is provided with teeth, and the long gear is positioned between the rack and the pressure rod and is meshed with the rack and the pressure rod; the long gear is provided with a non-tooth surface, and the pressure rod resets when the long gear rotates to the non-tooth surface corresponding to the pressure rod.

5. The thin-walled tube processing fixture of claim 1, wherein: the mounting plate is provided with a hollow sleeve, the movable frame is inserted in the hollow sleeve in a sliding manner, a long bolt is inserted in the hollow sleeve, the long bolt is inserted in the hollow sleeve and the movable frame and is in threaded connection with the movable frame, and the support spring is sleeved on the long bolt and is propped between the hollow sleeve and the movable frame.

6. The thin-walled tube processing fixture of claim 1, wherein: the movable frame is provided with the runner near the one end at mounting disc center, and the runner can rotate around self axis.

7. The thin-walled tube processing fixture of claim 1, wherein: the clamping side of the clamping plate is provided with an elastic pad with a preset thickness.

8. The thin-walled tube processing fixture of claim 1, wherein: except the splint at both ends on same connecting axle, one of them terminal surface of middle splint is provided with the spacing groove, and the spacing groove extends along the radial of splint, and another terminal surface of middle splint is provided with the connection lug, and the connection lug of the splint of internal diameter little slides and sets up in the spacing groove of the splint of internal diameter big in two adjacent splint, in the splint at both ends, and a side of the splint of internal diameter little is provided with the connection lug, and a side of the splint of internal diameter big is provided with the spacing groove, all is provided with the jack of wearing on the splint, and the connecting axle slides cartridge in the interlude hole.

9. The thin-walled tube processing fixture of claim 5, wherein: the movable frame comprises two threaded loop bars, the two threaded loop bars are connected through a fixed bar, one end of a connecting rope is connected with the fixed bar, and the other end of the connecting rope is connected with the threaded sleeve; two hollow sleeves are arranged on the mounting plate corresponding to each movable frame, the threaded sleeve rod is inserted into the hollow sleeves, and the long bolt is inserted into the hollow sleeves and the threaded sleeve rod.

10. The thin-walled tube processing fixture of claim 1, wherein: the mounting plate is provided with the mounting panel on, and hollow sleeve sets up in the mounting panel, still is provided with flexible post on the mounting panel, and the one end and the mounting panel of flexible post are connected, and the other end and the one deck splint that are closest to the mounting panel of flexible post are connected.