CN116160275A

CN116160275A - Machining floating clamp and clamping method thereof

Info

Publication number: CN116160275A
Application number: CN202310077336.7A
Authority: CN
Inventors: 吕辉方; 方萍; 张慧敏
Original assignee: Zhengzhou Zhengfei Machinery Co ltd
Current assignee: Zhengzhou Zhengfei Machinery Co ltd
Priority date: 2023-02-08
Filing date: 2023-02-08
Publication date: 2023-05-26

Abstract

The invention discloses a machining floating clamp and a clamping method thereof, wherein the machining floating clamp comprises a positioning disc and an isobaric cover, the isobaric cover is arranged at the bottom of the positioning disc, and a plurality of groups of clamping assemblies are arranged at the top of the positioning disc in a surrounding manner; the clamping assembly comprises an oil cylinder which is fixed above the positioning disc and extends along the radial direction of the positioning disc, a piston disc is slidably matched in the oil cylinder, and a push rod which extends coaxially with the oil cylinder is fixed at the end part of the piston disc. The beneficial effects are that: according to the invention, the isobaric cover communicated with the clamping assemblies is used as a hydraulic driving part, the isobaric cover communicated with the oil cylinders ensures that the push rod thrust forces of the clamping assemblies are kept consistent, meanwhile, the end part of the push rod is provided with the gears with a plurality of groups of driving structures, and the gears are used for meshing the two groups of racks so as to continuously drive one group of clamping arms to move to abut against the workpiece when the other group of clamping arms abut against the workpiece, thereby ensuring that the workpiece with an irregular shape can be kept in abutment with the same pressure at different positions through the plurality of groups of clamping arms.

Description

Machining floating clamp and clamping method thereof

Technical Field

The invention relates to the field of machining equipment, in particular to a machining floating clamp and a clamping method thereof.

Background

The fixture is one of necessary instruments in the machining process, the machining fixture can accurately determine the mutual positions of a workpiece, a machine tool and a cutter, the position accuracy of the workpiece is ensured by the fixture and is not influenced by the technical level of workers, the machining accuracy is high and stable, in addition, the workpiece is clamped by the fixture, so that the workpiece can be rapidly positioned and clamped, and the auxiliary working hours are remarkably reduced; the clamp is used for clamping the workpiece, so that the supporting rigidity of the workpiece is improved, and the cutting dosage can be increased. However, most of the existing machining clamps are platform pliers, two clamping and supporting surfaces of the existing machining clamps are plane, stable clamping cannot be guaranteed when a workpiece is in an irregular shape, a plurality of pressing plates driven by screw rods are required to be abutted against different positions of the workpiece, a plurality of pressing plates are required to be sequentially rotated in the clamping process to be matched with the clamping plates to be abutted against the outer side of the workpiece, supporting forces of a plurality of clamping positions cannot be kept consistent, and clamping stability is poor.

Disclosure of Invention

The invention aims to solve the problems and provide a machining floating clamp and a clamping method thereof, wherein a plurality of groups of clamping assemblies are arranged on a positioning disc, an isobaric cover communicated with the clamping assemblies is used as a hydraulic driving component, the isobaric cover communicated with a plurality of oil cylinders is used for ensuring that the push rod thrust of the clamping assemblies is consistent, meanwhile, gears of a plurality of groups of driving structures are arranged at the end parts of the push rods, two groups of racks are meshed by the gears so as to continuously drive one group of clamping arms to move to tightly clamp a workpiece when the other group of clamping arms tightly clamp the workpiece, the irregularly-shaped workpiece can be kept tightly clamped at the same pressure at different positions through the plurality of groups of clamping arms, the workpiece placing position is the clamping position, the clamping arms can be synchronously and continuously utilized to press and tightly clamp the workpiece after all the clamping arms are sequentially abutted to the outer sides of the workpiece, the position is ensured not to be moved in the clamping process, the placing position is the clamping locking position, and then the clamping arms can be synchronously pushed outwards to automatically open to release the preassembling action of the workpiece when the clamping arms are used for pressing and locking the workpiece, and the position stability and the convenience of the workpiece in the clamping process are further maintained.

In order to achieve the above purpose, the present invention provides the following technical solutions:

the invention provides a machining floating clamp which comprises a positioning disc and an isobaric cover, wherein the isobaric cover is arranged at the bottom of the positioning disc, and a plurality of groups of clamping assemblies are arranged at the top of the positioning disc in a surrounding manner;

the clamping assembly comprises an oil cylinder which is fixed above the positioning disc and radially extends along the positioning disc, a piston disc is slidably matched inside the oil cylinder, a push rod which coaxially extends with the oil cylinder is fixed at the end part of the piston disc, a rotating frame is fixed at one end of the oil cylinder, gears which are horizontally installed are rotatably matched inside the rotating frame, two groups of sliding frames are symmetrically fixed above the positioning disc on two sides of the rotating frame, sliding blocks are transversely slidably matched inside the sliding frames, racks which are meshed with the gears are respectively fixed on opposite sides of the two groups of sliding blocks, and two groups of clamping arms which are vertically extended are symmetrically fixed on opposite sides of the sliding blocks.

Preferably, the top of the positioning disc is surrounded by a plurality of groups of mounting grooves for accommodating clamping assemblies, a support seat which is arranged in the mounting groove through bolts is fixed on the outer side of the oil cylinder, the rotating frame is a U-shaped frame body with an opening facing away from the push rod, and a tray is arranged above the positioning disc.

Preferably, the bottom side of the tray is fixed on the top of the sliding frame, a plurality of groups of guide grooves for accommodating the clamping arms to extend upwards out of the tray are formed in the tray corresponding to the plurality of groups of sliding frames, one end, away from the gear, of the oil cylinder is communicated with a hydraulic oil pipe, a plurality of groups of pipeline connectors are formed in the outer circumference side of the isobaric cover, corresponding to the clamping assembly, of the isobaric cover, the isobaric cover is communicated with the hydraulic oil pipe through the pipeline connectors, and an oil supply pipe communicated with an external hydraulic pump station is arranged on the outer side of the isobaric cover.

Preferably, an auxiliary assembly is arranged at the bottom of the isobaric cover and comprises a containing cylinder arranged below the isobaric cover, the containing cylinder is of a hollow cylinder structure with an opening at the top, a flange plate communicated with the isobaric cover is arranged at the opening at the top of the containing cylinder, and a top plate vertically seals and slides inside the containing cylinder.

Preferably, the bottom of the top disc is fixed with a supporting rod vertically penetrating out of the accommodating cylinder, the supporting rod is in clearance fit with the bottom end of the accommodating cylinder, a spring propping against the bottom in the accommodating cylinder is sleeved outside the supporting rod below the top disc, a limiting ring limiting the downward moving stroke of the top disc is fixed inside the accommodating cylinder below the top disc, and the inner diameter of the limiting ring is smaller than the diameter of the top disc.

Preferably, the bottom end of the stay bar is fixedly provided with a disc-shaped synchronous disc, a chassis is arranged below the isobaric cover, a plurality of groups of support brackets for supporting the isobaric cover are arranged on the top of the chassis in a surrounding mode, a plurality of groups of fixing grooves which are vertically communicated are arranged on the outer circumferential side of the chassis in a surrounding mode, and a plurality of groups of pre-clamping assemblies are arranged on the center of the top of the chassis in a surrounding mode.

Preferably, the top of the chassis is provided with a plurality of groups of rotating lugs for supporting the pre-clamping assembly to rotate, the pre-clamping assembly comprises inclined struts hinged above the rotating lugs, the bottoms of the inclined struts are inclined inwards to gather together, the bottoms of the inclined struts are provided with transmission grooves extending along the inclined direction of the inclined struts, and the outer circumference side of the synchronous disc is provided with a plurality of groups of extending grooves for accommodating the bottom ends of the inclined struts.

Preferably, the inside transfer line that penetrates of extension groove is fixed with in the transfer line, the transfer line with transfer line sliding fit, the vertical holding groove that holds the bracing top that runs through in locating plate outer circumference side, the bracing top is fixed with along the radial fine setting frame that extends of locating plate, the inside sliding fit of fine setting frame has splint, splint bottom is to being close to locating plate center department horizontal extension.

Preferably, the middle part of the fine tuning frame is rotatably matched with a screw rod penetrating through the clamping plate, the screw rod is in threaded fit with the clamping plate, the outer end part of the screw rod penetrates out of the fine tuning frame and is fixedly provided with a disc-shaped knob, and the sliding block is of an I-shaped structure.

The clamping method of the machined floating clamp comprises the following steps:

a. when a workpiece is required to be clamped so as to be machined, the workpiece is placed above a tray, hydraulic oil is infused into an isobaric cover through an external hydraulic pump station, the isobaric cover guides hydraulic oil into an oil cylinder along a hydraulic oil pipe so as to push a piston disc to drive a push rod to move, two groups of racks on the outer two sides are pushed by gears in a rotating frame at the end part of the push rod to drive a sliding block and clamping arms to synchronously slide, the clamping arms penetrating through a guide groove upwards to extend to the upper side of the tray are used for moving towards the center of the tray, when one group of the two groups of clamping arms moving synchronously on the two sides of the same group of gears contacts the workpiece and is blocked by movement, the rotating frame of the gears is continuously pushed by the push rod, and the gears rotate so that the other group of clamping arms are continuously pushed by the gears until the other group of clamping arms are propped against the outer sides of the workpiece;

b. when two groups of clamping arms of one assembly clamping assembly are abutted against the outer side of a workpiece, the two clamping arms of the assembly clamping assembly are in a state of being abutted against the workpiece, hydraulic oil in an isobaric cover which is subsequently input into a hydraulic pump station is not conveyed into the assembly clamping assembly any more, and as hydraulic oil pipes of the multiple groups of clamping assemblies are communicated with the isobaric cover, the two clamping arms of the multiple groups of clamping assemblies can be abutted against the outer side of the workpiece under the same pressure, namely when eight clamping arms of the four assembly clamping assemblies are abutted against the outer side of the workpiece, at the moment, four groups of push rods and piston discs cannot move when hydraulic oil is continuously pumped, at the moment, the pressure in the whole hydraulic pipeline is increased by the hydraulic oil which is continuously pumped, so that the pressurizing and abutting action is started after the multiple clamping arms are abutted against the outer side of the workpiece in the first stage, and then the abutting and clamping action in the second stage is carried out;

c. when hydraulic oil is pumped into the isobaric cover to increase the pressure in the whole hydraulic pipeline so as to improve the abutting force of the clamping arms on the workpiece, the pressure in the accommodating cylinder communicated with the isobaric cover is synchronously increased, the pressure of the hydraulic oil downwards pushes the top disc to overcome the elastic force of the spring until the bottom side of the top disc moves downwards to the abutting limiting ring position, at the moment, the volume of the oil storage cavity in the accommodating cylinder cannot be continuously expanded, and the isobaric abutting state of a plurality of groups of clamping arms on different positions on the outer side of the workpiece can be further maintained through oil pressure;

d. before the driving clamp arms are abutted against the workpiece, the screw is driven to rotate through the rotating knob, the screw is used for driving the clamping plates to slide along the fine adjustment frame, the clamping plates of the four groups of pre-clamping assemblies are used for tightly propping the outer side of the workpiece to realize pre-clamping, the four groups of clamping plates are used for pre-positioning the workpiece when the clamping arms are not abutted against the workpiece through the clamping arms, so that the positions of the workpiece are kept when the clamping arms are abutted against the workpiece through the pre-clamping assemblies until the eight groups of clamping arms are abutted against the outer side of the workpiece, hydraulic oil is continuously input into the isobaric cover at the moment, the top disc downwards compresses the spring, the supporting rods at the bottom of the top disc drive the synchronous disc to downwards move, the transmission grooves are downwards pressed by the groups of transmission rods at the outer side of the synchronous disc to support the plurality of inclined struts to outwards rotate and open along the rotating lugs, and the pre-supporting effect of the clamping plates in the fine adjustment frame at the top ends of the inclined struts is relieved, and the plurality groups of pre-clamping assemblies are outwards separated and unfolded when the groups of the clamping arms are enabled to start to be pressed and abutted against the workpiece.

The beneficial effects are that: according to the invention, the plurality of groups of clamping assemblies are arranged on the positioning disc, the isobaric cover communicated with the plurality of clamping assemblies is used as a hydraulic driving component, and the thrust of push rods of the plurality of clamping assemblies is ensured to be consistent through the isobaric cover communicated with the plurality of oil cylinders;

meanwhile, a plurality of groups of gears of a driving structure are arranged at the end part of the push rod, and the gears are used for meshing the two groups of racks so as to continuously drive the other group of clamping arms to move to tightly press the workpiece when the one group of clamping arms tightly press the workpiece, so that the workpiece with an irregular shape can be kept to tightly press at different positions with equal pressure through the plurality of groups of clamping arms;

the workpiece placement position is a clamping position, and after all clamping arms are sequentially abutted to the outer side of the workpiece, the clamping arms can be synchronously and continuously utilized to pressurize and tightly abut against the workpiece, so that the workpiece is ensured not to move in the clamping process, and the placement position is a clamping locking position;

and then when the clamping arms are used for locking the workpiece in a pressurizing manner, the clamping assemblies can be synchronously pushed to be outwards opened automatically so as to release the pre-clamping action of the workpiece, and the position stability and convenience of the workpiece in the clamping process are further maintained.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a front view block diagram of the present invention;

FIG. 2 is a schematic perspective view of the present invention;

FIG. 3 is a schematic view of the structural disassembly of the present invention;

FIG. 4 is a schematic view of the positioning plate and clamping assembly of the present invention in a structural disassembly;

FIG. 5 is a schematic view of the clamping assembly of the present invention in a disassembled configuration;

FIG. 6 is a schematic view of the auxiliary assembly of the present invention in a disassembled configuration;

FIG. 7 is a schematic view of the preassembled clip assembly of the present invention with the chassis in a disassembled configuration;

FIG. 8 is a schematic perspective view of a pre-clamping assembly of the present invention;

fig. 9 is a top view of the present invention.

The reference numerals are explained as follows:

1. a positioning plate; 101. a mounting groove; 102. a receiving groove; 2. an isopiestic pressure cap; 201. a pipe joint; 3. clamping the assembly; 301. an oil cylinder; 301a, a support; 302. a push rod; 302a, piston disc; 303. a rotating frame; 303a, gears; 304. a sliding frame; 305. a slide block; 305a, a rack; 306. a clamp arm; 307. a hydraulic oil pipe; 4. a tray; 401. a guide groove; 5. an auxiliary component; 501. an accommodating cylinder; 501a, a flange plate; 502. a brace rod; 503. a top plate; 504. a limiting ring; 505. a synchronization disk; 505a, an extension groove; 505b, a transmission rod; 6. a pre-load clip assembly; 601. diagonal bracing; 602. a transmission groove; 603. a fine tuning frame; 604. a clamping plate; 605. a screw; 605a, a knob; 7. a chassis; 701. a fixing groove; 702. rotating the ear; 8. and a support bracket.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, based on the examples herein, which are within the scope of the invention as defined by the claims, will be within the scope of the invention as defined by the claims.

Referring to fig. 1-9, the invention provides a machining floating clamp, which comprises a positioning disc 1 and an isobaric cover 2, wherein the isobaric cover 2 is arranged at the bottom of the positioning disc 1, a plurality of groups of clamping assemblies 3 are circumferentially arranged at the top of the positioning disc 1, and the clamping assemblies 3 are used for supporting and positioning the outer side of a workpiece to realize clamping action;

the clamping assembly 3 comprises an oil cylinder 301 which is fixed above the positioning disk 1 and extends radially along the positioning disk 1, the oil cylinder 301 is of a cylindrical structure with an opening facing the center of the positioning disk 1, a piston disk 302a is slidably matched inside the oil cylinder 301, the piston disk 302a is matched with the oil cylinder 301 to form a piston structure, a push rod 302 which extends coaxially with the oil cylinder 301 is fixed at the end of the piston disk 302a, a rotating frame 303 is fixed at one end of the push rod 302, a horizontally installed gear 303a is rotatably matched inside the rotating frame 303, two groups of sliding frames 304 are symmetrically fixed above the positioning disk 1 at two sides of the rotating frame 303, sliding blocks 305 are transversely and slidably matched inside the sliding frames 304, racks 305a which are meshed with the gear 303a are fixed on opposite sides of the two groups of sliding blocks 305, two groups of vertically extending clamping arms 306 are symmetrically fixed on opposite sides of the two groups of sliding blocks 305, the racks 305a on two sides are supported by the gears 303a to drive the sliding blocks 305 and the outer clamping arms 306 to slide synchronously towards the center of the positioning disk 1, and the clamping arms 306 serve as supporting components on the outer sides of workpieces.

As an alternative embodiment, the top of the positioning disc 1 is provided with a plurality of groups of mounting grooves 101 for accommodating clamping assemblies 3 in a surrounding manner, a support 301a for being mounted in the mounting grooves 101 through bolts is fixed on the outer side of the oil cylinder 301, the rotating frame 303 is a U-shaped frame body with an opening facing away from the push rod 302, a tray 4 is arranged above the positioning disc 1, the bottom side of the tray 4 is fixed on the top of the sliding frame 304, the tray 4 is supported by the sliding frame 304, a plurality of groups of guide grooves 401 for accommodating clamping arms 306 which extend upwards out of the tray 4 are arranged on the tray 4 corresponding to the plurality of groups of sliding frame 304, one end, far away from the gear 303a, of the oil cylinder 301 is communicated with a hydraulic oil pipe 307, a one-way valve for limiting the hydraulic oil to be only conveyed into the oil cylinder 301 along the isobaric cover 2 is arranged on the hydraulic oil pipe 307, a plurality of groups of pipeline joints 201 are arranged on the top of the oil cylinder 301, the isobaric cover 2 is provided with a plurality of groups of pipeline joints 201 on the outer circumference side of the corresponding clamping assemblies 3, the isobaric cover 2 is communicated with the hydraulic oil pipe pump station 307 through the pipeline joints 201, and an oil supply pipe communicated with an external hydraulic pump station is arranged on the outer side of the isobaric cover 2 so as to be conveniently used as a driving source of hydraulic oil input to the hydraulic pump station;

the bottom of the isobaric cover 2 is provided with an auxiliary assembly 5, the auxiliary assembly 5 comprises a containing cylinder 501 arranged below the isobaric cover 2, the containing cylinder 501 is of a hollow cylinder structure with an opening at the top, a flange plate 501a communicated with the isobaric cover 2 is arranged at the opening at the top of the containing cylinder 501, the flange plate 501a is fixedly connected with the isobaric cover 2 through bolts, a top plate 503 is vertically sealed and slid inside the containing cylinder 501, a supporting rod 502 vertically penetrating through the containing cylinder 501 is fixed at the bottom of the top plate 503, the supporting rod 502 is in clearance fit with the bottom end of the containing cylinder 501, a spring propping against the bottom inside the containing cylinder 501 is sleeved outside the supporting rod 502 below the top plate 503, a limiting ring 504 limiting the downward movement stroke of the top plate 503 is fixed inside the containing cylinder 501 below the top plate 503, the inside diameter of the limiting ring 504 is smaller than the top plate 503, and the limiting ring 504 is ensured to be capable of limiting the downward movement stroke of the top plate 503;

a disc-shaped synchronizing disc 505 is fixed at the bottom end of a stay bar 502, a chassis 7 is arranged below the isobaric cover 2, a plurality of groups of support brackets 8 for supporting the isobaric cover 2 are arranged at the top of the chassis 7 in a surrounding manner, a plurality of groups of fixing grooves 701 which are vertically penetrated are arranged at the outer circumference side of the chassis 7 in a surrounding manner, bolts are conveniently penetrated into the fixing grooves 701 so as to fix the chassis 7 at a machining set position, a plurality of groups of pre-clamping components 6 are arranged at the center of the top of the chassis 7 in a surrounding manner, a plurality of groups of rotating lugs 702 for supporting the pre-clamping components 6 are arranged at the top of the chassis 7 in a surrounding manner, the pre-clamping components 6 comprise inclined struts 601 hinged above the rotating lugs 702, the bottoms of the inclined struts 601 are gathered inwards in an inclined manner, transmission grooves 602 extending along the inclined directions of the inclined struts 601 are formed in the bottoms of the inclined struts, and a plurality of groups of extending grooves 505a for accommodating the bottoms of the inclined struts 601 are arranged at the outer circumference side of the synchronizing disc 505;

the inside transfer line 505b that penetrates in the transfer line 602 that is fixed with of extending groove 505a, transfer line 505b and transfer line 602 sliding fit, thereby drive transfer line 505b at the synchronous dish 505 and reciprocate the in-process that can drive multiunit bracing 601 and gather together inwards or outwards open, and then realize the rotation process of preassembling clamp assembly 6, the vertical holding tank 102 that holds bracing 601 top that runs through in locating plate 1 outer circumference side, the bracing 601 top is fixed with along the radial fine setting frame 603 that extends of locating plate 1, the inside sliding fit of fine setting frame 603 has splint 604, splint 604 bottom is to being close to locating plate 1 center department horizontal extension, fine setting frame 603 middle part running fit has the screw 605 that runs through splint 604, screw 605 and splint 604 screw fit, the outer tip of screw 605 wears out fine setting frame 603 and is fixed with knob 605a, slider 305 is "worker" font structure, can drive the screw 605 through rotatory knob 605a and rotate and then drive splint 604 along fine setting frame 603 inboard, the position that the corresponding adjustment splint 604 of convenient messenger's according to the required support position of work piece.

The clamping method for machining the floating clamp comprises the following steps:

a. when a workpiece is required to be clamped so as to be machined, the workpiece is placed above the tray 4, hydraulic oil is infused into the isobaric cover 2 through an external hydraulic pump station, the isobaric cover 2 introduces the hydraulic oil into the oil cylinder 301 along the hydraulic oil pipe 307 so as to push the piston disc 302a to drive the push rod 302 to move, two groups of racks 305a on the outer two sides are pushed by a gear 303a in a rotating frame 303 at the end part of the push rod 302 so as to drive the sliding block 305 and the clamping arms 306 to synchronously slide, the clamping arms 306 extending upwards out of the guide groove 401 to the upper part of the tray 4 are used for moving towards the center of the tray 4, when one group of the clamping arms 306 on the two groups of the two sides of the same group of the gears 303a contacts the workpiece and is blocked by movement, the group of the clamping arms 306 stops, meanwhile, the rotating frame 303 of the gears 303a is continuously pushed by the push rod 302, the gears 303a rotate, and the other group of the clamping arms 306 are continuously pushed by the gears 303a until the clamping arms are abutted to the outer side of the workpiece;

b. when two groups of clamping arms 306 of one assembly clamping assembly 3 are abutted against the outer side of a workpiece, at this time, the two clamping arms 306 of the assembly clamping assembly 3 are in a state of abutting against the workpiece, hydraulic oil in an isobaric cover 2 which is subsequently input into a hydraulic pump station is not conveyed into the assembly clamping assembly 3 any more, as hydraulic oil pipes 307 of the multiple groups of clamping assemblies 3 are communicated with the isobaric cover 2, the two clamping arms 306 of the multiple groups of clamping assemblies 3 can be abutted against the outer side of the workpiece at the same pressure, namely, when eight clamping arms 306 of the four assembly clamping assemblies 3 are abutted against the outer side of the workpiece, at this time, the four groups of push rods 302 and piston discs 302a cannot move when hydraulic oil is continuously pumped, at this time, the pressure in the whole hydraulic pipeline is increased by the hydraulic oil which is continuously pumped, so that the pressurizing and abutting action is started after the multiple clamping arms 306 are abutted against the outer side of the workpiece at the first stage, the abutting and clamping actions at the second stage are carried out after the multiple clamping arms 306 are enabled to abut against the outer side of the workpiece at the first stage;

c. when hydraulic oil is pumped into the isobaric cover 2 to increase the pressure in the whole hydraulic pipeline so as to improve the abutting force of the clamping arms 306 on a workpiece, the pressure in the accommodating cylinder 501 communicated with the isobaric cover 2 is synchronously increased, the pressure of the hydraulic oil downwards pushes the top disc 503 to overcome the elastic force of the spring until the bottom side of the top disc 503 moves downwards to the position of the abutting limiting ring 504, at the moment, the volume of an oil storage cavity in the accommodating cylinder 501 cannot be continuously expanded, and the isobaric abutting state of a plurality of groups of clamping arms 306 on different positions outside the workpiece can be maintained through oil pressure;

d. before the driving clamp arm 306 is abutted against the workpiece, the screw 605 is driven to rotate by rotating the knob 605a, the clamping plate 604 is driven to slide along the fine adjustment frame 603 by utilizing the screw 605, the outer sides of the workpieces are abutted against by utilizing the clamping plates 604 of the four groups of pre-clamping assemblies 6 to realize pre-clamping, the workpiece is pre-positioned when the clamping arms 306 are not abutted against and positioned by utilizing the four groups of clamping plates 604, the workpiece position is kept when the clamping arms 306 are abutted against the workpieces by utilizing the pre-clamping assemblies 6 until the eight groups of clamping arms 306 are abutted against the outer sides of the workpieces, hydraulic oil is continuously input into the isobaric cover 2 at the moment, the top plate 503 compresses the spring downwards, the supporting rods 502 at the bottom of the top plate 503 drive the synchronous plate 505 to move downwards, the plurality of transmission grooves 602 are pressed by utilizing the plurality of transmission rods 505b at the outer sides of the synchronous plate 505 to support the plurality of diagonal braces 601 to rotate outwards and open along the rotating lugs 702, and accordingly the pre-supporting effect of the clamping plates 604 in the fine adjustment frame 603 at the top ends of the diagonal braces 601 on the workpieces is relieved, so that the plurality of groups of clamping arms 306 are ensured to start to press and abut against the workpieces, and simultaneously the plurality of groups of pre-clamping assemblies 6 are separated outwards.

By arranging a plurality of groups of clamping assemblies 3 on the positioning disk 1, the isobaric cover 2 communicated with the clamping assemblies 3 is used as a hydraulic driving component, and the thrust of the push rods 302 of the clamping assemblies 3 is ensured to be consistent through the isobaric cover 2 communicated with the oil cylinders 301;

meanwhile, a plurality of groups of gears 303a with driving structures are arranged at the end part of the push rod 302, and the gears 303a are used for meshing two groups of racks 305a so as to continuously drive one group of clamping arms 306 to move to tightly press a workpiece when the other group of clamping arms 306 are tightly pressed against the workpiece, so that the workpiece with an irregular shape can be kept to tightly press at the same pressure at different positions through the plurality of groups of clamping arms 306;

the workpiece placement position is the clamping position, after all the clamping arms 306 are sequentially abutted to the outer side of the workpiece, the clamping arms 306 can be synchronously used for continuously pressing and abutting the workpiece, so that the workpiece is ensured not to move in the clamping process, the placement position is the clamping locking position, floating clamping is realized by taking hydraulic oil as a stress medium, and the moving stability and the supporting strength of the clamping arms are ensured;

and then when the clamping arms 306 are used for pressing and locking the workpiece, the plurality of pre-clamping assemblies 6 can be synchronously pushed to be outwards and automatically opened so as to release the pre-clamping action of the workpiece, and the position stability and the convenience of the workpiece in the clamping process are further maintained.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A machined floating fixture, characterized by: the device comprises a positioning disc (1) and an isobaric cover (2), wherein the isobaric cover (2) is arranged at the bottom of the positioning disc (1), and a plurality of groups of clamping assemblies (3) are circumferentially arranged at the top of the positioning disc (1);

clamping subassembly (3) including be fixed in positioning disk (1) top and along this positioning disk (1) radial extension's hydro-cylinder (301), the inside sliding fit of hydro-cylinder (301) has piston dish (302 a), this piston dish (302 a) end fixing with push rod (302) of the coaxial extension of hydro-cylinder (301), push rod (302) stretch out hydro-cylinder (301) one end is fixed with rotating turret (303), and the inside normal running fit of this rotating turret (303) has gear (303 a) of horizontal installation, the both sides of rotating turret (303) positioning disk (1) top symmetry is fixed with two sets of sliding frame (304), and the inside horizontal sliding fit of this sliding frame (304) has slider (305), and two sets of slider (305) opposite sides all are fixed with meshing rack (305 a) of gear (303 a), and two sets of slider (305) opposite side symmetry are fixed with two sets of vertical arm clamps (306) that extend.

2. A machined floating fixture as set forth in claim 1 wherein: the utility model discloses a positioning device, including locating dish (1), cylinder (301) are fixed with support (301 a) in mounting groove (101) through the bolt, locating dish (1) top is encircleed and is provided with multiunit mounting groove (101) that hold clamping subassembly (3), rotating turret (303) are the opening dorsad U-shaped framework of push rod (302), locating dish (1) top is provided with tray (4).

3. A machined floating fixture as set forth in claim 2 wherein: the bottom side of the tray (4) is fixed at the top of the sliding frame (304), a plurality of groups of guide grooves (401) which are used for accommodating the clamping arms (306) and extend out of the tray (4) upwards are formed in the tray (4) corresponding to the plurality of groups of sliding frames (304), one end of the oil cylinder (301) away from the gear (303 a) is communicated with a hydraulic oil pipe (307), a plurality of groups of pipeline connectors (201) are arranged on the outer circumference side of the isobaric cover (2) corresponding to the clamping assembly (3), the isobaric cover (2) is communicated with the hydraulic oil pipe (307) through the pipeline connectors (201), and an oil supply pipe communicated with an external hydraulic pump station is arranged on the outer side of the isobaric cover (2).

4. A machined floating fixture as set forth in claim 3 wherein: the bottom of the isobaric cover (2) is provided with an auxiliary assembly (5), the auxiliary assembly (5) comprises a containing cylinder (501) arranged below the isobaric cover (2), the containing cylinder (501) is of a hollow cylinder structure with an open top, a flange plate (501 a) communicated with the isobaric cover (2) is arranged at the open top of the containing cylinder (501), and a top plate (503) vertically seals and slides inside the containing cylinder (501).

5. A machined floating clamp as set forth in claim 4 wherein: the supporting rod (502) vertically penetrating out of the accommodating cylinder (501) is fixed at the bottom of the top plate (503), the supporting rod (502) is in clearance fit with the bottom end of the accommodating cylinder (501), a spring propping against the inner bottom of the accommodating cylinder (501) is sleeved outside the supporting rod (502) below the top plate (503), a limiting ring (504) limiting the downward movement stroke of the top plate (503) is fixed inside the accommodating cylinder (501) below the top plate (503), and the inner diameter of the limiting ring (504) is smaller than the diameter of the top plate (503).

6. A machined floating clamp as set forth in claim 5 wherein: the novel constant pressure support is characterized in that a disc-shaped synchronous disc (505) is fixed at the bottom end of the supporting rod (502), a chassis (7) is arranged below the constant pressure cover (2), a plurality of groups of support brackets (8) for supporting the constant pressure cover (2) are arranged on the top of the chassis (7) in a surrounding mode, a plurality of groups of fixing grooves (701) which are vertically communicated are arranged on the outer circumference side of the chassis (7) in a surrounding mode, and a plurality of groups of pre-clamping assemblies (6) are arranged on the center of the top of the chassis (7) in a surrounding mode.

7. A machined floating clamp as set forth in claim 6 wherein: the utility model discloses a synchronous dish, including chassis (7), chassis (7) top is provided with multiunit support pre-clamping subassembly (6) pivoted rotation ear (702), pre-clamping subassembly (6) including articulated in diagonal brace (601) of rotation ear (702) top, diagonal brace (601) bottom is to inboard slope gather together, just diagonal brace (601) bottom is provided with transmission groove (602) that extend along its incline direction, synchronous dish (505) outer circumference side is provided with multiunit extension groove (505 a) that hold diagonal brace (601) bottom.

8. A machined floating clamp as set forth in claim 7 wherein: the utility model discloses a locating plate, including extension groove (505 a), locating plate (604), locating plate (1) is fixed with inside drive lever (505 b) penetrating in drive groove (602), drive lever (505 b) with drive groove (602) sliding fit, locating plate (1) outer circumference side is vertical runs through has accommodation groove (102) that holds bracing (601) top, bracing (601) top is fixed with along locating plate (1) radial extension's fine setting frame (603), fine setting frame (603) inside sliding fit has splint (604), splint (604) bottom is to being close to locating plate (1) center department horizontal extension.

9. A machined floating clamp as set forth in claim 8 wherein: the middle part normal running fit of fine setting frame (603) has run through screw rod (605) of splint (604), screw rod (605) with splint (604) screw thread fit, screw rod (605) outer tip is worn out fine setting frame (603) and is fixed with discoid knob (605 a), slider (305) are "worker" font structure.

10. A method of clamping a machined floating clamp according to any one of claims 1-9, comprising the steps of:

a. when a workpiece is required to be clamped so as to be machined, the workpiece is placed above the tray (4), then hydraulic oil is infused into the isobaric cover (2) through an external hydraulic pump station, the isobaric cover (2) introduces the hydraulic oil into the oil cylinder (301) along the hydraulic oil pipe (307) so as to push the piston disc (302 a) to drive the push rod (302) to move, two groups of racks (305 a) on the two outer sides are pushed by a gear (303 a) in a rotating frame (303) at the end part of the push rod (302) to drive the sliding block (305) and the clamping arm (306) to synchronously slide, the clamping arm (306) penetrating upwards out of the guide groove (401) to extend above the tray (4) moves towards the center of the tray (4), and when one group of the clamping arms (306) on the two sides of the same group of gears (303 a) contacts the workpiece and is blocked by movement, the rotating frame (303) of the gear (303 a) is pushed by the push rod (302), and the gear (303 a) is rotated until the other group of the clamping arms (306) is pushed by the other group of gears (303 a) to be pushed to the outer side of the workpiece;

b. when two groups of clamping arms (306) of one assembly clamping assembly (3) are abutted against the outer side of a workpiece, at the moment, the two clamping arms (306) of the assembly clamping assembly (3) are in a state of abutting against the workpiece, hydraulic oil in an equal pressure cover (2) which is subsequently input into a hydraulic pump station is not conveyed into the assembly clamping assembly (3), and as the hydraulic oil pipes (307) of the multiple groups of clamping assemblies (3) are communicated with the equal pressure cover (2), the two clamping arms (306) of the multiple groups of clamping assemblies (3) can be abutted against the outer side of the workpiece at the same pressure, namely, when eight clamping arms (306) of the four assembly clamping assemblies (3) are abutted against the outer side of the workpiece, at the moment, four groups of push rods (302) and a piston discs (302 a) cannot move when hydraulic oil is continuously pumped, at the moment, the pressure in the whole hydraulic pipeline is continuously pumped is increased, and thus, after the multiple clamping arms (306) are abutted against the outer side of the workpiece, a pressurizing and abutting action is started, so that the multiple clamping arms (306) can be abutted against the outer side of the workpiece at the first stage and then the workpiece can be abutted against the outer side of the workpiece;

c. when hydraulic oil is pumped into the isobaric cover (2) to increase the pressure in the whole hydraulic pipeline so as to improve the abutting force of the clamping arms (306) on a workpiece, the pressure in the accommodating cylinder (501) communicated with the isobaric cover (2) is synchronously increased, the pressure of the hydraulic oil pushes the top disc (503) downwards to overcome the elastic force of the spring until the bottom side of the top disc (503) moves downwards to the position of abutting the limiting ring (504), at the moment, the volume of an oil storage cavity in the accommodating cylinder (501) cannot be continuously expanded, and the isobaric abutting state of a plurality of groups of clamping arms (306) on different positions on the outer side of the workpiece can be further maintained through the oil pressure;

d. before the clamping arms (306) are driven to abut against the workpiece, the screw rod (605) is driven to rotate through the rotating knob (605 a), the screw rod (605) is used for driving the clamping plates (604) to slide along the fine adjustment frame (603), the clamping plates (604) of the four groups of pre-clamping assemblies (6) are used for abutting against the outer sides of the workpiece to realize pre-clamping, and then the four groups of clamping plates (604) are used for pre-positioning the workpiece when the clamping arms (306) are not abutted against and positioned, so that the clamping arms (306) are pressed against the workpiece through the pre-clamping assemblies (6) to keep the workpiece position until eight groups of clamping arms (306) are abutted against the outer sides of the workpiece, hydraulic oil is continuously input into the pressure cover (2) at the moment, so that the top plate (503) compresses the spring downwards, the supporting rods (502) at the bottom of the top plate (503) drive the synchronous plate (505) to move downwards, the plurality of groups of transmission rods (505 b) are used for pressing the transmission grooves (602) downwards to support the plurality of groups of diagonal members (601) to rotate outwards to expand along the rotating lugs (702), the pre-clamping arms (604) in the top end frame (603) of the diagonal members (601) are pressed against the workpiece, and the pre-clamping arms (604) are separated, and the plurality of groups of the clamp clamps (306) are pressed outwards to start to be pressed outwards and clamped, and the workpiece is ensured.