阅读说明：本技术 一种液压大钳结构 (Hydraulic tongs structure ) 是由 刘祖林 李杨 陈英达 黄小军 张晓东 谢帅 于 2021-08-11 设计创作，主要内容包括：本发明涉及一种液压大钳结构,包括钳架,钳架上部设置有旋转部可自动回位的主钳,钳架下部设置有旋转部可自动回位的背钳；钳架上还设置有自动对中结构及自动换档结构；所述自动对中结构包括可拆卸装置在主钳壳体上的固定感应部,及可拆卸装置在主钳旋转部上的触发部；固定感应部包括固定架,设置在固定架上的左感应开关及右感应开关；触发部包括设置在左感应开关、右感应开关下方的触发板。本发明能够有效解决现有的液压大钳结构,因为结构设计的不够合理及局限,需要人工进行对中、换档,并且主钳、被钳在旋转后需要人工进行回位,存着着劳工强度高,生产效率低下,操作难度大,并且存在一定的安全隐患的问题。(The invention relates to a hydraulic tong structure, which comprises a tong frame, wherein the upper part of the tong frame is provided with a main tong with a rotating part capable of automatically returning, and the lower part of the tong frame is provided with a back tong with a rotating part capable of automatically returning; the clamp frame is also provided with an automatic centering structure and an automatic gear shifting structure; the automatic centering structure comprises a fixed sensing part and a triggering part, wherein the fixed sensing part is detachably arranged on the main tong shell, and the triggering part is detachably arranged on the main tong rotating part; the fixed induction part comprises a fixed frame, and a left induction switch and a right induction switch which are arranged on the fixed frame; the trigger part comprises a trigger plate arranged below the left induction switch and the right induction switch. The hydraulic tong can effectively solve the problems that the existing hydraulic tong structure needs manual centering and gear shifting due to unreasonable and limited structural design, and the main tong and the clamped tong need manual returning after rotation, so that the hydraulic tong has high labor intensity, low production efficiency, high operation difficulty and certain potential safety hazards.)

1. The utility model provides a hydraulic tong structure, includes the tong frame, its characterized in that: the upper part of the clamp frame is provided with a main clamp with a rotary part capable of automatically returning, and the lower part of the clamp frame is provided with a back clamp with a rotary part capable of automatically returning; the clamp frame is also provided with an automatic centering structure and an automatic gear shifting structure connected with a gear shifting device in the main clamp; the automatic centering structure comprises a fixed sensing part and a triggering part, wherein the fixed sensing part is detachably arranged on the main tong shell, and the triggering part is detachably arranged on the main tong rotating part; the fixed induction part comprises a fixed frame, and a left induction switch and a right induction switch which are arranged on the fixed frame; the trigger part comprises a trigger plate arranged below the left induction switch and the right induction switch.

2. The hydraulic tong structure of claim 1, wherein: the main tong comprises a main tong toothed base, a group of main tong track grooves are formed in the inner ring of the main tong toothed base, a main tong jaw plate frame capable of rotating along the main tong track grooves is arranged in the main tong toothed base, a group of main tong jaw plate arrangement notches are formed in the side wall of the main tong jaw plate frame, main tong jaw plates capable of expanding and returning relative to the main tong jaw plate arrangement notches are arranged in each main tong jaw plate arrangement notch, a rotatable main tong return wheel is arranged on the outer side wall, facing the main tong track grooves, of each main tong jaw plate, and the main tong return wheel is matched with the main tong track grooves.

3. The hydraulic tong structure of claim 1 or 2, wherein: the back-up tong includes the back-up tong base, and back-up tong base inner circle is provided with a set of back-up tong orbit groove, is provided with in the back-up tong base and can follows back-up tong orbit groove pivoted back-up tong jaw frame, and a set of back-up tong jaw board is seted up to back-up tong jaw frame lateral wall and has been settled the breach, and each back-up tong jaw board is settled to be provided with in the breach can settle the back-up tong jaw board that the breach is flexible, the return relatively, and the back-up tong jaw board is provided with rotatable back-up tong return wheel towards the lateral wall in back-up tong orbit groove, back-up tong return wheel and back-up tong orbit groove looks adaptation.

4. The hydraulic tong structure of claim 3, wherein: the automatic gear shifting structure comprises a fixed plate arranged on one side of the main tong, a cylinder fixed seat is arranged on the fixed plate, a gear shifting cylinder is arranged on the cylinder fixed seat, and a piston part of the gear shifting cylinder is connected with a connecting rod capable of moving up and down along with the gear shifting cylinder; a rotating shaft hole is also formed in the fixing plate, and one end of the connecting rod, which is far away from the piston part of the gear shifting cylinder, can be rotatably arranged in the rotating shaft hole; the end part of the connecting rod, which is positioned in the rotating shaft hole, is connected with a gear shifting device in the main clamp.

5. The hydraulic tong structure of claim 5, wherein: two waist-shaped adjusting holes are formed in the fixing frame, the left induction switch and the right induction switch can be respectively detachably arranged on one waist-shaped adjusting hole, and the positions of the left induction switch and the right induction switch in the waist-shaped adjusting holes can be adjusted; the two waist-shaped adjusting holes are positioned on the same arc;

the trigger plate comprises a trigger bottom plate which is assembled on the upper end face of the main tong rotary tong body, a vertical part extends upwards from one side of the trigger bottom plate relative to the fixed frame, a centering plate which faces the fixed frame extends radially from the top end of the vertical part, the left end and the right end of the centering plate are respectively matched with the bottom end faces of the left induction switch and the right induction switch, and arc-shaped centering induction parts are formed at the end parts of the two ends of the centering plate;

the fixing frame is of a U-shaped frame structure with an opening facing the trigger plate, and comprises a fixing bottom plate assembled on the outer side wall of the shell, a connecting part radially and upwards extending and forming from the outer side end of the fixing bottom plate, a fixing part radially extending towards the trigger plate from the top end of the connecting part, and a waist-shaped adjusting hole formed in the fixing part;

anti-interference gaps are formed at the tail end of the centering plate connected with the vertical part and the upper part of the vertical part;

the left induction switch and the right induction switch are cylindrical, external threads are formed on the outer side walls of the left induction switch and the right induction switch, and positioning nuts matched with the external threads are respectively arranged on the upper end face and the lower end face, located in the kidney-shaped adjusting hole, of the left induction switch and the right induction switch.

6. The hydraulic tong structure of claim 3, wherein: the main tong jaw plate arrangement notch is located on the left side and the right side of the main tong jaw plate and is provided with a main tong torsional spring fixing pin respectively, the left side and the right side of the main tong jaw plate are provided with a main tong jaw plate torsional spring clamping pin respectively, the main tong torsional spring fixing pin is sleeved with a main tong torsional spring, and the upper end and the lower end of the main tong torsional spring are hooked on the main tong jaw plate torsional spring clamping pin on the same side.

7. The hydraulic tong structure of claim 6, wherein: a main tong return wheel mounting notch is formed in one side, facing the main tong track groove, of the main tong jaw plate, the main tong return wheel can be rotatably arranged in the main tong return wheel mounting notch, and the end part of the outer ring of the main tong return wheel extends out of the main tong return wheel mounting notch;

the main tong return wheel arrangement notch is located two outsides of the left and right sides of the main tong return wheel and is provided with a group of main bayonet lock fixing holes respectively, and each group of main bayonet lock fixing holes comprises an upper main bayonet lock fixing hole which is penetrated through to the main tong return wheel arrangement notch by the upper end face of a main tong jaw plate and a lower main bayonet lock fixing hole which is penetrated through to the main tong return wheel arrangement notch by the lower end face of the main tong jaw plate.

8. The hydraulic tong structure of claim 7, wherein: the middle parts of the upper end surface and the lower end surface of each main jaw plate placing notch are recessed to form main limiting grooves, and the upper end surface and the lower end surface of each main jaw plate are connected with the main limiting grooves and can perform telescopic motion along the main limiting grooves; the main limiting groove penetrates through the side walls of the inner ring and the outer ring of the jaw frame of the main tong;

each main tong jaw is settled breach and is located the left and right sides peak of main spacing groove and be provided with a set of main fixed pin pilot hole respectively, and every main fixed pin pilot hole of group all includes and runs through to the last main fixed pin pilot hole that main tong jaw settled the breach by main tong jaw frame up end, and runs through to the lower main fixed pin pilot hole that main tong jaw settled the breach by main tong jaw frame lower extreme terminal surface.

9. The self-return structure of a hydraulic tong according to claim 8, characterized in that: the structure of the back-up tong jaw frame and the back-up tong jaw plate is the same as that of the main tong jaw frame and the main tong jaw plate.

10. The self-return structure of a hydraulic tong according to claim 4, characterized in that: the whole connecting rod is of a three-section type bending structure and comprises a rotating shaft section, a connecting section and a lifting section which are integrally formed, wherein the lifting section is connected with the top end of the piston part of the gear shifting cylinder and can move up and down along with the piston part of the gear shifting cylinder; the rotating shaft section is rotatably arranged in the main clamp; the connecting section is formed between the rotating shaft section and the lifting section;

the top end of the piston part of the gear shifting cylinder is connected with the upper end surface of the gripper, and the lifting section of the connecting rod is arranged on the gripper; the gripper is of a U-shaped structure, a U-shaped notch is formed in the side wall of the gripper, and the lifting section is arranged in the U-shaped notch;

the cylinder fixing plate comprises a top plate and a side plate arranged on the left side of the top plate, a gear shifting cylinder barrel is arranged on the top plate, a piston part of the gear shifting cylinder vertically extends downwards from the lower end face of the top plate, and the side plate and the gear shifting cylinder piston part are oppositely arranged; the upper part of the side plate is provided with an upper proximity switch, the lower part of the side plate is provided with a lower proximity switch, and the extending U-shaped notch of the lifting section of the connecting rod is matched with the upper proximity switch and the lower proximity switch.

Technical Field

The invention relates to a hydraulic tong structure.

Background

The existing hydraulic big tongs structure needs manual centering and gear shifting because of the unreasonable and limited structural design, and the main tongs and the passive tongs need manual returning after rotating. Therefore, the labor intensity is greatly increased, the operation difficulty is improved, the production efficiency is reduced, and certain potential safety hazards exist.

Disclosure of Invention

The invention aims to provide a hydraulic tong structure which can effectively solve the problems that the existing hydraulic tong structure needs manual centering and gear shifting due to unreasonable and limited structural design, and a main tong and a passive tong need manual returning after rotation, so that the labor intensity is high, the production efficiency is low, the operation difficulty is high, and certain potential safety hazards exist.

The technical scheme adopted by the invention for solving the technical problems is as follows: a hydraulic tong structure comprises a tong frame, wherein the upper part of the tong frame is provided with a main tong with a rotating part capable of automatically returning, and the lower part of the tong frame is provided with a back tong with a rotating part capable of automatically returning; the clamp frame is also provided with an automatic centering structure and an automatic gear shifting structure connected with a gear shifting device in the main clamp; the automatic centering structure comprises a fixed sensing part and a triggering part, wherein the fixed sensing part is detachably arranged on the main tong shell, and the triggering part is detachably arranged on the main tong rotating part; the fixed induction part comprises a fixed frame, and a left induction switch and a right induction switch which are arranged on the fixed frame; the trigger part comprises a trigger plate arranged below the left induction switch and the right induction switch.

Furthermore, the main tong comprises a main tong toothed base, a group of main tong track grooves are formed in the inner ring of the main tong toothed base, a main tong jaw plate frame capable of rotating along the main tong track grooves is arranged in the main tong toothed base, a group of main tong jaw plate arrangement notches are formed in the side wall of the main tong jaw plate frame, main tong jaws capable of expanding and retracting and returning relative to the main tong jaw plate arrangement notches are arranged in each main tong jaw plate arrangement notch, a rotatable main tong return wheel is arranged on the outer side wall, facing the main tong track grooves, of each main tong jaw plate, and the main tong return wheel is matched with the main tong track grooves.

Further, the back-up tong includes the back-up tong base, back-up tong base inner circle is provided with a set of back-up tong orbit groove, be provided with in the back-up tong base and follow back-up tong orbit groove pivoted back-up tong jaw plate frame, back-up tong jaw plate lateral wall has been seted up a set of back-up tong jaw plate and has been settled the breach, each back-up tong jaw plate is settled and is provided with the back-up tong jaw plate that can settle the breach relatively in the breach flexible, the return, the back-up tong jaw plate is provided with rotatable back-up tong return wheel towards the lateral wall in back-up tong orbit groove, back-up tong return wheel and back-up tong orbit groove looks adaptation.

Furthermore, the automatic gear shifting structure comprises a fixed plate arranged on one side of the main tong, a cylinder fixed seat is arranged on the fixed plate, a gear shifting cylinder is arranged on the cylinder fixed seat, and a piston part of the gear shifting cylinder is connected with a connecting rod capable of moving up and down along with the gear shifting cylinder; a rotating shaft hole is also formed in the fixing plate, and one end of the connecting rod, which is far away from the piston part of the gear shifting cylinder, can be rotatably arranged in the rotating shaft hole; the end part of the connecting rod, which is positioned in the rotating shaft hole, is connected with a gear shifting device in the main clamp.

Furthermore, two waist-shaped adjusting holes are formed in the fixing frame, the left induction switch and the right induction switch can be respectively detachably arranged on one waist-shaped adjusting hole, and the positions of the left induction switch and the right induction switch in the waist-shaped adjusting holes can be adjusted; the two waist-shaped adjusting holes are positioned on the same arc;

the trigger plate comprises a trigger bottom plate which is assembled on the upper end face of the main tong rotary tong body, a vertical part extends upwards from one side of the trigger bottom plate relative to the fixed frame, a centering plate which faces the fixed frame extends radially from the top end of the vertical part, the left end and the right end of the centering plate are respectively matched with the bottom end faces of the left induction switch and the right induction switch, and arc-shaped centering induction parts are formed at the end parts of the two ends of the centering plate;

the fixing frame is of a U-shaped frame structure with an opening facing the trigger plate, and comprises a fixing bottom plate assembled on the outer side wall of the shell, a connecting part radially and upwards extending and forming from the outer side end of the fixing bottom plate, a fixing part radially extending towards the trigger plate from the top end of the connecting part, and a waist-shaped adjusting hole formed in the fixing part;

anti-interference gaps are formed at the tail end of the centering plate connected with the vertical part and the upper part of the vertical part;

the left induction switch and the right induction switch are cylindrical, external threads are formed on the outer side walls of the left induction switch and the right induction switch, and positioning nuts matched with the external threads are respectively arranged on the upper end face and the lower end face, located in the kidney-shaped adjusting hole, of the left induction switch and the right induction switch.

Furthermore, the main tong jaw plate arrangement notch is located at the left side and the right side of the main tong jaw plate and is provided with a main tong torsional spring fixing pin respectively, the left side and the right side of the main tong jaw plate are provided with a main tong jaw plate torsional spring clamping pin respectively, the main tong torsional spring fixing pin is sleeved with a main tong torsional spring, and the upper end and the lower end of the main tong torsional spring are hooked on the main tong jaw plate torsional spring clamping pin at the same side.

Furthermore, a main tong return wheel arrangement notch is formed in one side, facing the main tong track groove, of the main tong jaw plate, the main tong return wheel can be rotatably arranged in the main tong return wheel arrangement notch, and the end part of the outer ring of the main tong return wheel extends out of the main tong return wheel arrangement notch;

the main tong return wheel arrangement notch is located two outsides of the left and right sides of the main tong return wheel and is provided with a group of main bayonet lock fixing holes respectively, and each group of main bayonet lock fixing holes comprises an upper main bayonet lock fixing hole which is penetrated through to the main tong return wheel arrangement notch by the upper end face of a main tong jaw plate and a lower main bayonet lock fixing hole which is penetrated through to the main tong return wheel arrangement notch by the lower end face of the main tong jaw plate.

Furthermore, the middle parts of the upper end surface and the lower end surface of each main jaw plate placing notch are recessed to form main limiting grooves, and the upper end surface and the lower end surface of each main jaw plate are connected with the main limiting grooves and can perform telescopic motion along the main limiting grooves; the main limiting groove penetrates through the side walls of the inner ring and the outer ring of the jaw frame of the main tong;

each main tong jaw is settled breach and is located the left and right sides peak of main spacing groove and be provided with a set of main fixed pin pilot hole respectively, and every main fixed pin pilot hole of group all includes and runs through to the last main fixed pin pilot hole that main tong jaw settled the breach by main tong jaw frame up end, and runs through to the lower main fixed pin pilot hole that main tong jaw settled the breach by main tong jaw frame lower extreme terminal surface.

Furthermore, the structures of the back-up tong jaw plate frame and the back-up tong jaw plate are the same as those of the main tong jaw plate frame and the main tong jaw plate.

Furthermore, the whole connecting rod is of a three-section type bending structure and comprises a rotating shaft section, a connecting section and a lifting section which are integrally formed, wherein the lifting section is connected with the top end of the piston part of the gear shifting cylinder and can move up and down along with the piston part of the gear shifting cylinder; the rotating shaft section is rotatably arranged in the main clamp; the connecting section is formed between the rotating shaft section and the lifting section;

the top end of the piston part of the gear shifting cylinder is connected with the upper end surface of the gripper, and the lifting section of the connecting rod is arranged on the gripper; the gripper is of a U-shaped structure, a U-shaped notch is formed in the side wall of the gripper, and the lifting section is arranged in the U-shaped notch;

the cylinder fixing plate comprises a top plate and a side plate arranged on the left side of the top plate, a gear shifting cylinder barrel is arranged on the top plate, a piston part of the gear shifting cylinder vertically extends downwards from the lower end face of the top plate, and the side plate and the gear shifting cylinder piston part are oppositely arranged; the upper part of the side plate is provided with an upper proximity switch, the lower part of the side plate is provided with a lower proximity switch, and the extending U-shaped notch of the lifting section of the connecting rod is matched with the upper proximity switch and the lower proximity switch.

The invention has the beneficial effects that: the automatic centering, gear shifting and returning can be realized through the automatic centering structure, the automatic gear shifting structure and the main pliers and the back pliers with the rotatable parts capable of returning automatically, and the centering, gear shifting and returning accuracy and efficiency are improved; in the whole process, manual operation is not needed, and convenience and safety of operation are improved; meanwhile, the working efficiency is greatly improved, and the labor cost and the time cost can be effectively reduced. Can effectively solve current hydraulic pressure tong structure, because structural design's reasonable inadequately and limitation, need the manual work to carry out centering, gear shift to main pincers, by pincers need the manual work to carry out the return after rotatory, it is high to have labor intensity, production efficiency is low, the operation degree of difficulty is big, and there is the problem of certain potential safety hazard.

The invention will be explained in more detail below with reference to the drawings and examples.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic diagram of an exploded structure of the main tong.

Fig. 3 is a schematic diagram of an exploded structure of the back-up tong.

Fig. 4 is a schematic structural view of the jaw frame of the main tong.

Fig. 5 is a schematic structural view of the main jaw plate and the back jaw plate.

Fig. 6 is a schematic structural view of a back-up tong jaw frame.

Fig. 7 is a schematic structural view of the self-centering structure.

Fig. 8 is a schematic structural view of another aspect of the present invention, in which the automatic centering structure is omitted.

Fig. 9 is a schematic configuration diagram of the automatic shift structure.

Fig. 10 is a schematic structural view of a connecting rod.

Wherein, 1, a clamp frame, 2, a master clamp, 3, a back clamp, 4, a base with teeth of the master clamp, 5, a track groove of the master clamp, 6, a jaw frame of the master clamp, 7, a jaw plate placing gap of the master clamp, 8, a jaw plate of the master clamp, 9, a return wheel of the master clamp, 10, a fixing pin of the torsion spring of the master clamp, 11, a clamping pin of the jaw plate of the master clamp, 12, a torsion spring of the master clamp, 13, a wheel placing gap of the return wheel of the master clamp, 15, a fixing hole of an upper clamping pin, 16, a fixing hole of a lower main clamping pin, 17, a limiting groove of the master, 18, an assembling hole of an upper fixing pin, 19, an assembling hole of a lower main fixing pin, 20, a base of the back clamp, 21, a track groove of the back clamp, 22, a jaw frame of the back clamp, 23, a jaw plate placing gap of the back clamp, 24, a jaw plate of the back clamp, 25, a wheel of the back clamp, 26, a fixing pin, 27, a torsion spring of the back clamp, 28, a torsion spring of the back clamp, 29, a notch of the back clamp, 30, a back clamp return wheel of the back clamp, 31. the automatic gear shifting device comprises a lower back bayonet lock fixing hole, a lower back bayonet lock fixing hole 32, a back limiting groove 33, an upper back fixing pin assembling hole, a lower back fixing pin assembling hole 34, an automatic centering structure 41 and an automatic gear shifting structure; 104. the device comprises a left induction switch, 105, a right induction switch, 106, a waist-shaped adjusting hole, 107, a positioning nut, 108, a trigger bottom plate, 109, a vertical part, 110, a centering plate, 111, a centering induction part, 112, an interference prevention notch, 113, a fixed bottom plate, 114, a connecting part, 115, a fixed part, 116, an external assembly hole, 202, a fixed plate, 203, a cylinder fixing seat, 204, a gear shifting cylinder, 205, a connecting rod, 206, a rotating shaft hole, 207, a rotating shaft section, 208, a connecting section, 209, a lifting section, 210, a gripper, 211, a U-shaped notch, 212, a top plate, 213, a side plate, 214, an upper proximity switch, 215 and a lower proximity switch.

Detailed Description

In the embodiment, as shown in fig. 1 to 10, a hydraulic tong structure includes a tong frame 1, a main tong 2 with a rotation part capable of automatically returning is arranged at the upper part of the tong frame 1, and a back tong 3 with a rotation part capable of automatically returning is arranged at the lower part of the tong frame 1; the caliper frame 1 is further provided with an automatic centering structure 40 and an automatic shifting structure 41 connected with a shifting device inside the main caliper 2. The automatic centering structure 40 comprises a fixed sensing part which is detachably arranged on the shell of the main tong 2 and a triggering part which is used for detachably arranging on the rotary tong body of the main tong 2; the fixed induction part comprises a fixed frame, a left induction switch 104 and a right induction switch 105 which are arranged on the fixed frame; the trigger part comprises trigger plates arranged below the left inductive switch 104 and the right inductive switch 105.

Two waist-shaped adjusting holes 106 are formed on the fixing frame, the left inductive switch 104 and the right inductive switch 105 can be respectively detachably arranged on one waist-shaped adjusting hole 106, and the position of the waist-shaped adjusting hole 106 can be adjusted. The two kidney-shaped adjusting holes 106 are positioned on the same circular arc. The left inductive switch 104 and the right inductive switch 105 are cylindrical, external threads are formed on the outer side walls of the left inductive switch 104 and the right inductive switch 105, and positioning nuts 107 matched with the external threads are respectively arranged on the upper end face and the lower end face of the waist-shaped adjusting hole 106 of the left inductive switch 104 and the right inductive switch 105.

The trigger plate comprises a trigger bottom plate 108 assembled on the upper end face of the main tong rotary tong body, a vertical part 109 extends upwards from one side of the trigger bottom plate 108 relative to the fixed frame, a centering plate 110 extends towards the fixed frame in the radial direction from the top end of the vertical part 109, the left end and the right end of the centering plate 110 are respectively matched with the bottom end faces of the left induction switch 104 and the right induction switch 105, and arc-shaped centering induction parts 111 are formed at the end parts of the two ends of the centering plate 110. The end of the centering plate 110 that meets the vertical portion 109 and the upper portion of the vertical portion are formed with interference-preventing notches 112.

The fixing frame is a U-shaped frame structure with an opening facing the trigger plate, and comprises a fixing bottom plate 113 assembled on the outer side wall of the shell, a connecting part 114 formed by radially extending upwards from the outer side end of the fixing bottom plate 113, a fixing part 115 facing the trigger plate direction and radially extending from the top end of the connecting part 114, and a waist-shaped adjusting hole 106 formed on the fixing part 115.

A set of external mounting holes 116 are formed in the fixed base plate 113 and the trigger base plate 108. The fixed bottom plate 113 and the trigger bottom plate 108 are detachably assembled on the main clamp shell and the main clamp rotating clamp body through external assembling holes 116 through bolts.

The judgment of the rotating angle of the rotating part of the main tong 2 can be realized by matching the fixed sensing part arranged on the shell of the main tong 2 with the trigger part arranged on the rotating part of the main tong, so as to achieve the purpose of automatic centering. The problem of current hydraulic tong carry out the centering through the manual work, have potential safety hazard and inefficiency is effectively solved, and this centering structure still has simple structure, easily realizes, centering effectual simultaneously.

The main tong 2 comprises a main tong toothed base 4, a group of main tong track grooves 5 are formed in the inner ring of the main tong toothed base 4, a main tong jaw frame 6 capable of rotating along the main tong track grooves 5 is arranged in the main tong toothed base 4, a group of main tong jaw plate arrangement notches 7 are formed in the side wall of the main tong jaw frame 6, main tong jaws 8 capable of stretching and retracting and returning relative to the main tong jaw plate arrangement notches 7 are arranged in the main tong jaw plate arrangement notches 7, a rotatable main tong return wheel 9 is arranged on the outer side wall of each main tong jaw plate 8 facing the main tong track grooves 5, and the main tong return wheel 9 is matched with the main tong track grooves 5.

The main tong jaw arrangement notch 7 is located the left and right sides of the main tong jaw 8 and is provided with a main tong torsional spring fixing pin 10 respectively, the left and right sides of the main tong jaw 8 are provided with a main tong jaw torsional spring bayonet lock 11 respectively, the main tong torsional spring fixing pin 10 is sleeved with a main tong torsional spring 12, and the upper and lower ends of the main tong torsional spring 12 are hooked on the main tong jaw torsional spring bayonet lock 11 at the same side.

One side of the main tong jaw plate 8 facing the main tong track groove 5 is provided with a main tong return wheel arrangement notch 13, the main tong return wheel 9 can be rotatably arranged in the main tong return wheel arrangement notch 13, and the end part of the outer ring of the main tong return wheel 9 extends out of the main tong return wheel arrangement notch 13.

The main tong return wheel arrangement notch 13 is positioned on the left side and the right side of the main tong return wheel 9 and is respectively provided with a group of main bayonet lock fixing holes, each group of main bayonet lock fixing holes comprises an upper main bayonet lock fixing hole 15 which penetrates through the upper end face of the main tong jaw plate 8 to the main tong return wheel arrangement notch 13 and a lower main bayonet lock fixing hole 16 which penetrates through the lower end face of the main tong jaw plate 8 to the main tong return wheel arrangement notch 13.

The middle parts of the upper end surface and the lower end surface of each main jaw plate mounting notch 7 are recessed to form a main limiting groove 17, and the upper end surface and the lower end surface of each main jaw plate 8 are connected with the main limiting groove 17 and can perform telescopic motion along the main limiting groove 17; the main limiting groove 17 penetrates through the side walls of the inner ring and the outer ring of the main jaw frame 6.

Each main tong jaw is settled breach 7 and is located the left and right sides peak of main spacing groove 17 and be provided with a set of main fixed pin pilot hole respectively, and every main fixed pin pilot hole of group all includes and runs through to the last main fixed pin pilot hole 18 that main tong jaw settled breach 7 by main tong jaw 6 up end to reach runs through to the lower main fixed pin pilot hole 19 that main tong jaw settled breach 7 by the terminal surface under the main tong jaw 6.

The back-up tong 3 is provided with a return structure which is the same as that of the main tong 2. The method comprises the following specific steps:

back-up tong 3 includes back-up tong base 20, back-up tong base 20 inner circle is provided with a set of back-up tong orbit groove 21, be provided with in the back-up tong base 20 and follow back-up tong jaw frame 22 of back-up tong orbit groove 21 pivoted, back-up tong jaw frame 22 lateral wall has been seted up a set of back-up tong jaw and has been settled breach 23, each back-up tong jaw is settled to be provided with in the breach 23 can settle the back-up tong jaw 24 that breach 23 is flexible, the back-up tong returns the wheel 25 towards the lateral wall of back-up tong orbit groove 21, back-up tong return wheel 25 and back-up tong orbit groove 21 looks adaptation.

Back-up tong jaw arrangement notch 23 is located the left and right sides of back-up tong jaw 24 and is provided with a back-up tong torsional spring fixed pin 26 respectively, and the left and right sides of back-up tong jaw 24 is provided with a back-up tong jaw torsional spring bayonet lock 27 respectively, and back-up tong torsional spring fixed pin 26 cover is equipped with back-up tong torsional spring 28, and the upper and lower both ends of back-up tong torsional spring 28 collude on the back-up tong jaw torsional spring bayonet lock 27 of homonymy.

One side of the back-up tong jaw plate 24 facing the back-up tong track groove 21 is provided with a back-up tong return wheel installation notch 29, the back-up tong return wheel 25 can be rotatably arranged in the back-up tong return wheel installation notch 29, and the end part of the outer ring of the back-up tong return wheel 25 extends out of the back-up tong return wheel installation notch 29.

The back-up tong return wheel arrangement notch 29 is positioned on the left side and the right side of the back-up tong return wheel 25 and is respectively provided with a group of back-up tong fixing holes, each group of back-up tong fixing holes comprises an upper back-up tong fixing hole 30 which is penetrated through from the upper end surface of the back-up tong jaw plate 24 to the back-up tong return wheel arrangement notch 29 and a lower back-up tong fixing hole 31 which is penetrated through from the lower end surface of the back-up tong jaw plate 24 to the back-up tong return wheel arrangement notch 29.

The middle parts of the upper end surface and the lower end surface of each back-up tong jaw plate arrangement notch 23 are concavely formed with back limiting grooves 32, and the upper end surface and the lower end surface of each back-up tong jaw plate 24 are connected with the back limiting grooves 32 and can perform telescopic motion along the back limiting grooves 32; the back limiting groove 32 is arranged through the inner and outer ring side walls of the back tong jaw frame 22.

Each back tong jaw is settled breach 23 and is located back of the body spacing groove 32 about both sides peak and be provided with a set of back of the body fixed pin pilot hole respectively, every back of the body fixed pin pilot hole of group all includes and runs through to the back of the body fixed pin pilot hole 33 of settling breach 23 to the back of the body tong jaw by back of the body tong jaw frame 22 up end, and runs through to the back of the body fixed pin pilot hole 34 of the lower back of the body fixed pin of settling breach 23 to the back of the body tong jaw by the terminal surface under the back of the body tong jaw frame 22.

When the main tong jaw frame 6 rotates, the main tong return wheel 9 on the main tong jaw 8 offsets with the main tong track groove 5, and in the rotating process, the main tong jaw 8 is arranged with the notch 7 to stretch out and draw back relatively to the main tong jaw because of the change of the relative position of the main tong return wheel 9 and the main tong track groove 5. At the same time, the main jaw torsion spring 12 will provide a torsion force to the main jaw 8, which will drive the main jaw 8 to return to the initial position.

The automatic gear shifting structure 41 comprises a fixed plate 202 arranged on one side of the main tong 2, a cylinder fixed seat 203 is arranged on the fixed plate 202, a gear shifting cylinder 204 is arranged on the cylinder fixed seat 203, and a connecting rod 205 capable of moving up and down along with the piston part of the gear shifting cylinder 204 is connected and arranged; the fixed plate 202 is also provided with a rotating shaft hole 206, and one end of the connecting rod 205, which is far away from the piston part of the shift cylinder 204, can be rotatably arranged in the rotating shaft hole 206; the end of the connecting rod 205 located in the rotating shaft hole 206 is connected to the shifting device inside the main tong 2.

The connecting rod 205 is integrally of a three-section bending structure and comprises a rotating shaft section 207, a connecting section 208 and a lifting section 209 which are integrally formed, wherein the lifting section 209 is connected with the top end of the piston part of the gear shifting cylinder 204 and can move up and down along with the piston part of the gear shifting cylinder 204; the rotating shaft section 207 is rotatably arranged in the rotating shaft hole 206 and is connected with a gear shifting device inside the main clamp 2; the connecting section 208 is formed between the rotating shaft section 207 and the lifting section 209.

The gear shifting mechanism of the hydraulic tong further comprises a hand grip 210, the top end of the piston part of the gear shifting cylinder is connected with the upper end surface of the hand grip 210, and the lifting section 209 of the connecting rod 205 is arranged on the hand grip 210.

The hand grip 210 is of a U-shaped structure, a U-shaped notch 211 is formed in the hand grip, and the lifting section 209 is arranged in the U-shaped notch 211.

The cylinder fixing plate 203 comprises a top plate 212 and a side plate 213 arranged at the left side of the top plate 212, the cylinder of the shift cylinder 204 is arranged on the top plate 212, the piston part of the shift cylinder 204 vertically extends downwards from the lower end surface of the top plate 212, and the side plate 213 and the piston part of the shift cylinder 204 are oppositely arranged; the upper part of the side plate 213 is provided with an upper proximity switch 214, the lower part of the side plate 213 is provided with a lower proximity switch 215, and the extending U-shaped notch 211 of the lifting section 209 of the connecting rod 205 is matched with the upper proximity switch 214 and the lower proximity switch 215.

The up-and-down movement of the shift cylinder 204 moves the hand grip 210, and the up-and-down section 209 of the connecting rod 205 on the hand grip 210 moves up and down. The movement of the lifting segment 209 will drive the rotation shaft segment 207 to rotate in the rotation shaft hole 206 through the connection segment 208. The rotation of the rotating shaft segment 207 of the connecting rod 205 drives the shifting device in the main tong 2 connected with the rotating shaft segment to operate, so as to realize the shifting of high and low gears.

In the description of the present invention, it is to be understood that the terms "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified. Furthermore, the term "comprises" and any variations thereof is intended to cover non-exclusive inclusions.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

The invention is described above with reference to the accompanying drawings. It is to be understood that the specific implementations of the invention are not limited in this respect. Various insubstantial improvements are made by adopting the method conception and the technical scheme of the invention; the present invention is not limited to the above embodiments, and can be modified in various ways.