CN209021686U - A kind of rotating platform of crane clamp for machining - Google Patents

Abstract

The utility model discloses a kind of rotating platform of crane clamp for machining, including preceding hinge lifting centering body, the mobile centering body of rear hinge, bottom plate clamp system and bottom plate auxiliary support mechanism；The clamp for machining of the utility model, pass through the U-shaped positioning of hinge before preceding hinge lifting centering body realization turntable, hinge V-type positions after realizing turntable by the mobile centering body of rear hinge, the fixed turntable bottom of claw mode is driven using oil cylinder by bottom plate clamp system, realize that multiple Auxiliary support points provide Auxiliary support power from bottom to top for turntable bottom plate by bottom plate auxiliary support mechanism, not only it can guarantee stabilization when processing but also the elastic recoil because of the generation that is loaded can be eliminated, the dimensional accuracy after thereby may be ensured that bottom plate seat ring plane machining.

Description

A kind of rotating platform of crane clamp for machining

Technical field

The utility model relates to rotating platform of crane technical fields, and in particular to a kind of rotating platform of crane clamp for machining.

Background technique

Relational language is explained:

Size is sprung back after machining: fixture exerts a force to workpiece when due to processing, and the point for causing workpiece portion rigidity bad produces Raw flexible deformation, unclamps fixture after machining, elastic recoil occurs for the point deformed under pressing force effect originally, causes to machine Dimensional discrepancy afterwards, many turntable bottom plate processing there is such problems at present.

Rotating platform of crane is a not closed box-structure, and it mainly includes milling that rotating platform of crane, which needs mach point, Bottom seat ring face 1 and boring each one group of hinge hole (preceding hinge hole 2 and rear hinge hole 3) up and down, as shown in Figure 1, this is processed at two It is two important manufacturing procedures.Seat ring face 1 is first processed, to be assembled on pivoting support after being processed because of seat ring face 1, it is desirable that with revolution Bearing surface has higher compactness, the seat ring face after simultaneous processing also by as in boring, the benchmark in rear hinge hole, therefore it is required that There is higher flatness in seat ring face.If the flatness in seat ring face exceed design requirement range, that is, will appear assembly after seat ring with The fitting of pivoting support end face is not firm, it will connects as the major reason that turntable makes sound in turning course, while to bolt The reliability connect is also brought greater impact.

Turntable structure itself is a not closed box-structure, and the cantilevered out part self-stiffness in 4 two sides of bottom plate is low, such as Fig. 2 It is shown, it is easy to appear the problem of being loaded flexible deformation and processing vibration in processing, influences the flatness in seat ring face.Technology at present When processing turntable, using four very heavy top supports, support force vertically upward is provided.It wears axis and by screw rod and pressure thick stick in preceding hinge hole It compresses, downward pressing force is provided.Flexible and screw rod the compression of jack relies primarily on manual operation realization, the compression of application Power size can not determine, related with the force size of worker.After the processing of turntable seat ring face, after the jack for removing two sides, bottom plate It will appear certain downward springback capacity, the seat ring flatness after leading to processing goes wrong.

It once to be crossed to turntable structure before processing, determine the horizontal and vertical center line of turntable, it is subsequent to add Work needs to be loaded and process turntable structure using this both threads as reference, as shown in Figure 2.

Before machining, need to mark transverse direction, the longitudinal centre line of turntable on face plate, following process need with This both threads is used as referring to being loaded and processing turntable structure, as shown in Figure 2.In the prior art, it crosses the process found accurately are as follows: worker Be loaded on the table turntable when with the center line on marking-off pin contraposition turntable realize turntable longitudinal centre line and platen Longitudinal center it is parallel, the cross central line of turntable and the longitudinal center of workbench are vertical.The scheme of the processing centering is in addition to looking for Positive process is cumbersome and stability it is poor except, it is also necessary to increase preceding road scribing process, increase manufacturing process cost.And turntable and work The positioning datum made between platform is not fixed, and being loaded every time, it is primary to require adjustment.

It is placed in addition, scratching process needs to turn on one's side turntable, such as Fig. 2, there are biggish security risks in switching process, and Overturning can bring certain deformation of colliding with to turntable seat ring face.

Utility model content

The purpose of the utility model is to overcome deficiencies in the prior art, propose a kind of rotating platform of crane processed clip Tool solves the technical issues of cumbersome turntable center line scribing line and clamping rebound exists in the prior art.

In order to solve the above technical problems, the utility model provides a kind of rotating platform of crane clamp for machining, characterized in that packet Include preceding hinge lifting centering body, the mobile centering body of rear hinge, bottom plate clamp system and bottom plate auxiliary support mechanism；

The preceding hinge goes up and down centering body, including can oscilaltion first base, place at the top of first base useful The U-shaped frame of hinge before turntable is supported, this U-shaped frame can move left and right at the top of first base；

The mobile centering body of hinge after described, including second base, second base top are placed with after supporting turntable The V-type frame of hinge, this V-type frame can move in left-right direction at the top of second base；

The bottom plate clamp system, including third pedestal, are placed with pull rod moving up and down on third pedestal, on pull rod It is arranged with claw, claw can be slided up and down along pull rod, and the top of pull rod is equipped with groove, and the top activity of pull rod is equipped with and groove Matched Anti-release clamp；

The bottom plate auxiliary support mechanism, including symmetrically placed portal frame, the top plan of each portal frame is offered Several row's sliding slots, every row have multiple sliding slots, can place the oil cylinder that can be jacked upwards in each sliding slot.

It preferably, further include basic platform, the preceding hinge lifting centering body, rear hinge mobile centering body, bottom plate Clamp system and bottom plate auxiliary support mechanism are both secured on basic platform, wherein preceding hinge lifting centering body is located at basis and puts down The front end of platform, the mobile centering body of rear hinge are located at rear end, bottom plate clamp system and the bottom plate auxiliary support mechanism of basic platform Positioned at the centre of basic platform.

Preferably, the first track extended along the longitudinal direction is equipped in basic platform front end, the bottom of first base is equipped with The sliding block to match with the first track be moved forward and backward first base can along the first track.

Preferably, U-shaped frame includes two the first support plates, and two the first support plates are arranged in parallel in left-right direction, and two Symmetrical U-shaped mouth is offered at the top of first support plate.

Preferably, the second track extended in left-right direction is installed, under each first support plate at the top of first base Side's installation is there are two the first card slot, arrangement before and after two the first card slots, and the first support plate passes through the first card slot and the second track Cooperation can be moved left and right along the second track.

Preferably, the rear end of basic platform is equipped with the third track extended along the longitudinal direction, and the bottom of second base is equipped with The sliding block to match with third track be moved forward and backward second base can along third track.

Preferably, V-type frame includes two the second support plates, and two the second support plates are arranged in parallel in left-right direction, and two Symmetrical V-type mouth is offered at the top of second support plate.

Preferably, the 4th track extended in left-right direction is installed, under each second support plate at the top of second base There are two the second card slot, the second support plates can be moved along the 4th track or so by the cooperation of the second card slot and the 4th track for side's installation It is dynamic.

Preferably, the claw is in cross type.

Compared with prior art, the utility model beneficial effect achieved is:

1. front and back hinge is used to position turntable front-rear position, automatic capturing center is realized in centering, and same class may be implemented and turn Positioning datum of the platform on fixture is consistent, eliminates worker to line centering；

2. selecting the position of best Auxiliary support point, and support force is designed as optimal value and immobilizes, guaranteeing to process When turntable bottom plate two sides rigidity while will not have an impact the elastic deformation amount of seat ring flatness；

3. the preferable part of rigidity in supporting point and compression point selection turntable structure, it is ensured that the reliability of clamping.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of turntable machining processing stand；

Fig. 2 is the schematic diagram of the transverse direction of turntable, longitudinal centre line scribing line；

Fig. 3 is the structural schematic diagram of clamp for machining embodiment；

Fig. 4 is the structural schematic diagram that clamp for machining clamps turntable；

Fig. 5 is the structural schematic diagram of preceding hinge positioning U type frame；

Fig. 6 is the structural schematic diagram of rear hinge positioning V-shaped frame；

Fig. 7 is that point-supported structural schematic diagram is cut with scissors in front and back；

Fig. 8 is the structural schematic diagram at front and back hinge centering center and basic platform center parallel；

Fig. 9 is the structural schematic diagram of bottom plate hold-down mechanism；

Figure 10 is the structural schematic diagram that bottom plate hold-down mechanism compresses turntable bottom plate；

Figure 11 is the structural schematic diagram of bottom plate auxiliary support mechanism；

Figure 12 is the schematic diagram of two kinds of model turntable difference auxiliary supporting point positions.

Appended drawing reference: I, turntable；1, seat ring face；2, preceding hinge hole；3, rear hinge hole；4, bottom plate；

10, basic platform；

100, first base；101, the first track；102, first servo motor；103, the second track；104, the first support Plate；105, the first card slot；106, the second servo motor；107, the first locating shaft；

200, second base；201, third track；202, third servo motor；203, the 4th track；204, the second support Plate；205, the second card slot；206, the 4th servo motor；207, the second locating shaft；

300, third pedestal；301, pull rod；302, claw；303, Anti-release clamp；

400, portal frame；401, sliding slot；402, oil cylinder.

Specific embodiment

The utility model is further described with reference to the accompanying drawing.Following embodiment is only used for clearly illustrating this The technical solution of utility model, and cannot be used as a limitation the limitation protection scope of the utility model.

In the description of the utility model patent, it should be noted that the terms "include", "comprise" or its any other Variant is intended to non-exclusive inclusion, in addition to comprising those of listed element, but also may include being not explicitly listed Other element.

In the description of the utility model patent, it should be noted that term " center ", "upper", "lower", "left", "right", The orientation or positional relationship of the instructions such as "vertical", "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, It is merely for convenience of description the utility model patent and simplifies description, rather than the device or element of indication or suggestion meaning are necessary It with specific orientation, is constructed and operated in a specific orientation, therefore should not be understood as the limitation to the utility model patent.This Outside, term " first ", " second ", " third " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.

In the description of the utility model patent, it should be noted that unless otherwise clearly defined and limited, term " installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be fixedly connected, may be a detachable connection or one Connect to body；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, it can also be indirect by intermediary It is connected, can be the connection inside two elements.For the ordinary skill in the art, on being understood with concrete condition State concrete meaning of the term in the utility model patent.

A kind of rotating platform of crane clamp for machining of the utility model, including preceding hinge lifting centering body, rear hinge are mobile Centering body, bottom plate clamp system and bottom plate auxiliary support mechanism；

The preceding hinge goes up and down centering body, including can oscilaltion first base 100, put at the top of first base 100 It is equipped with the U-shaped frame of the hinge before supporting turntable, this U-shaped frame can move left and right at the top of first base 100；

The hinge afterwards moves centering body, including second base 200, is placed at the top of second base 200 for supporting The V-type frame of hinge after turntable, this V-type frame can move in left-right direction at 200 top of second base；

The bottom plate clamp system, including third pedestal 300 are placed with pull rod moving up and down on third pedestal 300 301, claw 302 is arranged on pull rod 301, and claw 302 can be slided up and down along pull rod 301, and the top activity of pull rod 301 is equipped with Anti-release clamp 303；

The bottom plate auxiliary support mechanism, including symmetrically placed portal frame 400, the top plan of each portal frame 400 Several sliding slots 401 are offered, the oil cylinder 402 that can be jacked upwards can be placed in each sliding slot 401.

The clamp for machining of the utility model is passed through by the U-shaped positioning of hinge before preceding hinge lifting centering body realization turntable Hinge V-type positions after the mobile centering body of hinge realizes turntable afterwards, drives claw mode using oil cylinder by bottom plate clamp system Fixed turntable bottom realizes that multiple Auxiliary support points provide auxiliary from bottom to top for turntable bottom plate by bottom plate auxiliary support mechanism Support force not only can guarantee stabilization when processing but also can eliminate the elastic recoil because of the generation that is loaded, and thereby may be ensured that bottom block Dimensional accuracy after enclosing plane machining.

Embodiment

A kind of embodiment of rotating platform of crane clamp for machining of the utility model is joined as shown in figure 3 and figure 4, including basis is flat Platform 10 and the preceding hinge being set on basic platform 10 lifting centering body, rear hinge mobile centering body, bottom plate clamping machine Structure and bottom plate auxiliary support mechanism.

Preceding hinge goes up and down centering body, shown in Figure 3, before preceding hinge lifting centering body is located at basic platform 10 End, including can oscilaltion first base 100, the U-shaped of before supporting turntable hinge is placed at the top of first base 100 Frame, this U-shaped frame can move left and right at the top of first base 100.

The structure of U-shaped frame is shown in Figure 5, including two the first support plates 104, and two the first support plates 104 are along left and right Direction parallel arrangement, the top of two the first support plates 104 offers identical U-shaped mouth.

In order to make preceding hinge lifting centering body realization automatically move the preceding hinge of alignment, set in 10 front end of basic platform There is the first track 101 extended along the longitudinal direction, the bottom of first base 100 is equipped with the sliding block to match with the first track 101, It is moved forward and backward first base 100 can in the first track of driving lower edge 101 of first servo motor 102, as the first track 101 Length can according to before the size and turntable of basic platform hinge placement location determine.

First base 100 be can oscilaltion, this elevating function can be by feed screw nut pair in the prior art, can also be with It is to be realized by motor driven.It is shown in Figure 5, the second track extended in left-right direction is installed at the top of first base 100 For 103(referring to Fig. 3 and Fig. 4, this second track is vertical with the first orbital direction on basic platform), each first support plate 104 Lower section installation there are two the first card slot 105, arranged before and after two the first card slots 105, the first support plate 104 passes through the first card slot 105 can move left and right with the cooperation of the second track 103 along the second track 103, be automatically aligned to realize, first of U-shaped frame Fagging 104 is moved left and right under the driving of the second servo motor 106 along this second track 103 by the first card slot 105.

When the preceding hinge for needing to be aligned turntable provides support force, first base is driven by first servo motor 102 100 are moved to the horizontal position in hinge hole before turntable along the first track 101, the hinge hole before going up and down this first base 100 and reaching Height and position, then by the second servo motor 106 drive the first support plate 104 along the second track 103 be moved to before cut with scissors At the center of spot hole, the preceding point-supported structural schematic diagram of hinge is shown in Figure 7, and the first positioning of auxiliary is inserted into preceding hinge hole Axis 107, the first locating shaft 107 are just contained in the U-shaped mouth of two the first support plates 104, play the role of stablizing support turntable.

The mobile centering body of hinge afterwards, it is shown in Figure 3, fluted, rear hinge shifting is opened up in the rear end of basic platform 10 Dynamic centering body is located in the groove of 10 rear end of basic platform, including second base 200, places at the top of second base 200 useful The V-type frame of hinge after turntable is supported, this V-type frame can move in left-right direction at 200 top of second base.

The structure of V-type frame is shown in Figure 6, including two the second support plates 204, and two the second support plates 204 are along left and right Direction parallel arrangement, the top of two the second support plates 204 offers identical V-type mouth.

In order to hinge after making the mobile centering body realization of rear hinge automatically move alignment, shown in Figure 3, basis is flat The third track 201 extended along the longitudinal direction is equipped in the groove of platform 10, the bottom of second base 200 is equipped with and third track 201 sliding blocks to match move second base 200 can under the driving of third servo motor 202 before and after third track 201 It is dynamic, it can be determined according to the placement location of hinge after the size and turntable of basic platform as the length of third track.

It is shown in Figure 6, the 4th track 203(extended in left-right direction is installed referring to Fig. 3 at the top of second base 200 And Fig. 4, this 4th track are vertical with the third orbital direction on basic platform), the lower section of each second support plate 204 is equipped with Two the second card slots 205, the second support plate 204 can be along the 4th tracks by the cooperation of the second card slot 205 and the 4th track 203 203 move left and right, and are automatically aligned to realize, the driving lower edge of the second support plate 204 of V-type frame in the 4th servo motor 206 This 4th track 203 moves left and right.

When the after hinge for needing to be aligned turntable provides support force, second base is driven by third servo motor 202 200 are moved to the horizontal position of hinge after turntable along third track 201, are then passing through the 4th servo motor 206 driving second Support plate 204 is moved at the center of rear hinge along the 4th track 203, and it is shown in Figure 7 to cut with scissors point-supported structural schematic diagram afterwards, The second locating shaft 207 of auxiliary is inserted into rear hinge hole, the second locating shaft 207 is just contained in two the second support plates 204 V-type mouth in, play the role of stablize support turntable.

Preceding hinge lifting centering body and rear hinge translation centering body play main supporting role to turntable, form three Point type support construction can stablize support turntable structure.The radial positioning of locating shaft, preceding hinge U may be implemented in the V-type of hinge afterwards Type locating slot can support turntable.

After turntable is supported by front and back support, the height of hinge before and after the lift adjustment of adjusting first base can be passed through Difference, to guarantee that seat ring face is parallel with workbench.Then preceding hinge centering center and rear hinge centering center are determined respectively, from And guarantee the center of turntable and the center parallel of basic platform, as shown in Figure 8.

Bottom plate clamp system, it is shown in Figure 9, preceding hinge lifting centering body and rear hinge are located on basic platform 10 Between mobile centering body, the third pedestal 300 including being fixed on basic platform 10, being placed on third pedestal 300 can be by Oil cylinder drives the pull rod 301 moved up and down, the claw 302 in cross type is arranged on pull rod 301, claw 302 can be along pull rod 301 slide up and down, and the top of pull rod 301 is equipped with groove, and the top activity of pull rod 301 is equipped with and the matched Anti-release clamp of groove 303。

The interstitial hole that bottom plate clamp system passes through turntable is located at the top of turntable, and turntable is placed on before the support above of front and back hinge It needs to take down Anti-release clamp 303 and claw 302, after the front and back hinge positioning of turntable, the centre bore contraposition of claw 302 is covered in pull rod On 301, by claw 302 along 301 slide downward of pull rod until the cross of claw 302 touches the support in turntable interstitial hole Place's (referring to Figure 10, be located in hole, not with contacts baseplate), the groove cooperated with Anti-release clamp 303, pressure are arranged at the top of pull rod 301 Anti-release clamp 303 is inserted into the groove on pull rod 301 by pawl 302 after being in place, oil cylinder drive pull rod 301 and Anti-release clamp 303 to Lower movement can confirm that turntable is reliably pressed until Anti-release clamp 303 and claw 302 push down turntable and reach preset pressure Tightly.

It is the relatively good point of turntable structure rigidity that the front and back hinge supporting point of turntable and top, which compress point, therefore will not be produced Change shape.

Rigidly poor point needs certain assistant reinforcement effect, bottom plate Auxiliary support machine in machining for bottom plate two sides Structure is to provide support force for bottom plate, shown in Figure 11, symmetrically placed portal frame 400, the top flat of each portal frame 400 Face offers several row's sliding slots 401, and every row has multiple sliding slots 401, can place the oil cylinder that can be jacked upwards in each sliding slot 401 402。

After turntable is compressed by the support of front and back hinge and cross, 4 two sides of turntable bottom plate are real by 402 automatic lifting of oil cylinder Existing Auxiliary support.Oil cylinder 402 is to be fixed in the sliding slot 401 of portal frame (Fig. 3), and the piston rod of oil cylinder upward, makes different location Oil cylinder 402 in sliding slot 401 carries out jacking can be with to provide support force at bottom plate different location, therefore in use, can root Different Support Positions is adjusted according to the turntable of different size model.

The turntable of different model, the size of bottom plate is different, and the point of Auxiliary support is also different, the position of supporting point be with It is radially diverged on the basis of turntable bottom plate center, 5 row's sliding slots is equipped in the present embodiment, every row is equipped with multiple sliding slots, Ke Yishi The processing of 32 kinds of model turntables is answered to be loaded, Figure 12 illustrates that the Auxiliary support point position of two kinds of models.

Rigid support effect when in order to guarantee that aiding support point can satisfy turntable processing, and turntable bottom plate will not be made to produce Raw flexible deformation, the top lift of oil cylinder is by HYDRAULIC CONTROL SYSTEM.By verifying, oil cylinder Auxiliary support power control 5000N both It can guarantee that effective Auxiliary support of turntable bottom plate will not bring the flexible deformation of bottom plate again.

The power output of oil cylinder can be determined jointly by hydraulic system pressure and oil cylinder piston effective active area.This is practical new The effective work area of oil cylinder that type is chosen is 900mm2, and operating pressure 2Mpa, operating pressure needs are according to live real work feelings Condition is demarcated.

The utility model clamp for machining has the beneficial effect that

Turntable bottom box-structure extends to front and back hinge, forms the preferable structural body of rigidity, but bottom plate Two sides are open plate structures, and rigidity is poor.

The positioning and compression point that the utility model is chosen are exactly turntable rigidly preferable part, and can pass through rear hinge V The automatic positioning of turntable is realized in type positioning, the U-shaped positioning of preceding hinge and front and back hinge centering, eliminates the operation of traditional scribing line centering Method.Meanwhile compressing in such a way that oil cylinder drives cross, it realizes that pressing force is fixed, manually tightens screw rod than traditional Mode is more reliable and more stable.The Auxiliary support point position of same product and Auxiliary support power are fixed, both certifiable processing When stabilization can eliminate the elastic recoil because of the generation that is loaded again, size after thereby may be ensured that bottom plate seat ring plane machining essence Degree.

The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art For art personnel, without deviating from the technical principle of the utility model, several improvements and modifications can also be made, these change It also should be regarded as the protection scope of the utility model into modification.

Claims (9)

1. a kind of rotating platform of crane clamp for machining, characterized in that including preceding hinge lifting centering body, the mobile transducer of rear hinge Structure, bottom plate clamp system and bottom plate auxiliary support mechanism；

The preceding hinge goes up and down centering body, including can oscilaltion first base, be placed with for propping up at the top of first base The U-shaped frame of hinge before support turntable, this U-shaped frame can move left and right at the top of first base；

The mobile centering body of hinge after described, including second base, second base top are placed with the hinge after supporting turntable V-type frame, this V-type frame can move in left-right direction at the top of second base；

The bottom plate clamp system, including third pedestal are placed with pull rod moving up and down on third pedestal, are arranged on pull rod There is claw, claw can be slided up and down along pull rod, and the top activity of pull rod is equipped with Anti-release clamp；

The bottom plate auxiliary support mechanism, including symmetrically placed portal frame, the top plan of each portal frame offers several A sliding slot can place the oil cylinder that can be jacked upwards in each sliding slot.

2. a kind of rotating platform of crane clamp for machining according to claim 1, characterized in that it further include basic platform, it is described Preceding hinge lifting centering body, the mobile centering body of rear hinge, bottom plate clamp system and bottom plate auxiliary support mechanism are both secured to On basic platform, wherein preceding hinge lifting centering body is located at the front end of basic platform, the mobile centering body of rear hinge is located at base Rear end, bottom plate clamp system and the bottom plate auxiliary support mechanism of plinth platform are located at the centre of basic platform.

3. a kind of rotating platform of crane clamp for machining according to claim 2, characterized in that be equipped with edge in basic platform front end The first track that front-rear direction extends, the bottom of first base are equipped with the sliding block to match with the first track, make first base can It is moved forward and backward along the first track.

4. a kind of rotating platform of crane clamp for machining according to claim 3, characterized in that U-shaped frame includes two first Fagging, two the first support plates are arranged in parallel in left-right direction, and symmetrical U-shaped mouth is offered at the top of two the first support plates.

5. a kind of rotating platform of crane clamp for machining according to claim 4, characterized in that be equipped with edge at the top of first base The second track that left and right directions extends, the lower section installation of each first support plate is there are two the first card slot, before two the first card slots After arrange, the first support plate can be moved left and right by the cooperation of the first card slot and the second track along the second track.

6. a kind of rotating platform of crane clamp for machining according to claim 2, characterized in that the rear end of basic platform is equipped with edge The third track that front-rear direction extends, the bottom of second base are equipped with the sliding block to match with third track, make second base can It is moved forward and backward along third track.

7. a kind of rotating platform of crane clamp for machining according to claim 6, characterized in that V-type frame includes two second Fagging, two the second support plates are arranged in parallel in left-right direction, and symmetrical V-type mouth is offered at the top of two the second support plates.

8. a kind of rotating platform of crane clamp for machining according to claim 7, characterized in that be equipped with edge at the top of second base The 4th track that left and right directions extends, there are two the second card slot, the second support plate passes through for the lower section installation of each second support plate The cooperation of second card slot and the 4th track can be moved left and right along the 4th track.

9. a kind of rotating platform of crane clamp for machining according to claim 1, characterized in that the claw is in cross type.