CN217750051U

CN217750051U - Accurate centering welding clamping device of medium plate bending piece

Info

Publication number: CN217750051U
Application number: CN202220983389.6U
Authority: CN
Inventors: 齐玉峰
Original assignee: Henan Merike Intelligent Equipment Co ltd
Current assignee: Henan Merike Intelligent Equipment Co ltd
Priority date: 2022-04-22
Filing date: 2022-04-22
Publication date: 2022-11-08
Anticipated expiration: 2032-04-22

Abstract

The utility model relates to a precision centering welding clamping device for a bent piece of a medium plate, which comprises an installation platform, wherein the installation platform is provided with a positioning plate, an adjustable inner support mechanism, a positioning clamping mechanism and a centering clamping mechanism, and the positioning clamping mechanism and the centering clamping mechanism are distributed relatively; the adjustable inner support mechanism comprises an adjusting bolt, a guide fixing seat, a V-shaped adjusting block, a push plate, a limiting plate and an end face positioning shaft; the positioning and clamping mechanism comprises a turnover positioning mechanism, a first mounting plate, a first positive and negative tooth double-end screw rod and a clamping block; the centering and clamping mechanism comprises a second mounting plate, a guide rail, a second positive and negative tooth double-end lead screw and a nut seat. The utility model discloses a medium plate bending piece realizes the correction of bending stress deformation and the accurate alignment of the coaxiality of the upper holes of two bending pieces during the assembly and the full weld, and can further realize that the welding deformation of a workpiece is ingeniously avoided after the assembly and the full weld of the part in a tool, and the workpiece is quickly taken out; provides a good solution for the relevant welding and assembling fields.

Description

Accurate centering welding clamping device of medium plate bending piece

Technical Field

The utility model belongs to the technical field of industrial automation technique welding, in particular to accurate centering welding clamping device of cut deal bending.

Background

In the field of welding, the problem that an inner positioning tool is difficult to separate from a workpiece due to welding deformation of the workpiece after the workpiece is fully welded is often encountered; when the medium plate bending pieces are symmetrically welded, workpieces with high consistency are difficult to weld in batches due to the deformation quantity of the bent parts, and the welding efficiency and the welding precision become problems which need to be faced in the welding production process in the field with the requirement on the welding appearance. Especially, in the occasion of need compatible multiple size, conventional supplementary tool either uses the installation extremely inconvenient, or does not reach the higher requirement of work piece product uniformity, causes efficiency and finished product qualification rate low.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the not enough of current conventional clamping jig, and provide a be applicable to the accurate centering welding clamping device of cut deal bending, adopt adjustable interior supporting mechanism, so but accurate positioning and the postweld break away from with the work piece fast, still can effectually overcome the deformation of part self, and the welding field that has certain requirement to welding efficiency and welding precision provides fine solution.

The purpose of the utility model and the technical problem thereof are realized by adopting the following technical scheme. According to the utility model, the precision centering welding clamping device for the bent piece of the medium plate comprises an installation platform, wherein the installation platform is provided with a positioning plate, an adjustable inner support mechanism, a positioning clamping mechanism and a centering clamping mechanism, the positioning clamping mechanism and the centering clamping mechanism are distributed relatively, and the positioning plate is positioned between the positioning clamping mechanism and the centering clamping mechanism; the adjustable inner support mechanism comprises an adjusting bolt, a guide fixing seat, a V-shaped adjusting block, push plates, limiting plates and an end face positioning shaft, the adjusting bolt is in threaded connection with the guide fixing seat, the lower end of the adjusting bolt is fixedly connected with the V-shaped adjusting block, the V-shaped adjusting block is movably arranged in the guide fixing seat along the vertical direction, the push plates capable of sliding along the left and right directions are symmetrically arranged on two sides of the guide fixing seat, the end face positioning shaft is arranged on the outer sides of the push plates, the push plates are connected with the guide fixing seat through spring pins, the two push plates can be pre-pressed on the corresponding sides of the V-shaped adjusting block through the spring pins, inclined planes in contact fit with the V-shaped adjusting block are arranged on the inner sides of the push plates, the limiting plates are symmetrically arranged on two sides of the guide fixing seat, and the limiting plates are used for being in stop fit with the corresponding push plates; the positioning and clamping mechanism comprises a turnover positioning mechanism, a first mounting plate, a first positive and negative tooth double-ended screw rod and two clamping blocks arranged at intervals oppositely, the clamping blocks are arranged on the first mounting plate in a sliding mode along the left-right direction, two ends of the first positive and negative tooth double-ended screw rod are assembled on the first mounting plate through first bearing seats, the end portion of the first positive and negative tooth double-ended screw rod is connected with a first driving mechanism, a first screw nut is fixedly arranged on each clamping block, the two first screw nuts are respectively in threaded connection with two ends of the first positive and negative tooth double-ended screw rod, and the two clamping blocks are driven to move relatively or back to back when the first positive and negative tooth double-ended screw rod rotates; the overturning positioning mechanism comprises an overturning shaft arranged on the first mounting plate through a bearing with a seat, an overturning plate connected with the overturning shaft and abutting pieces symmetrically arranged on two sides of the overturning plate, and the abutting pieces are matched with the corresponding clamping blocks to clamp one end of a workpiece; the centering and clamping mechanism comprises a second mounting plate, a guide rail, a second positive and negative tooth double-ended screw rod and two nut seats which are oppositely arranged at intervals, the guide rail is laid on the second mounting plate along the left-right direction, two ends of the second positive and negative tooth double-ended screw rod are assembled on the second mounting plate through a second bearing seat, the end part of the second positive and negative tooth double-ended screw rod is connected with a second driving mechanism, each nut seat is fixedly connected with one second nut, the two second nuts are respectively in threaded connection with two ends of the first positive and negative tooth double-ended screw rod, and when the second positive and negative tooth double-ended screw rod rotates, the two clamping blocks are driven to move relatively or back to back; each screw seat is provided with a ball sliding block, the two ball sliding blocks are assembled on the guide rail in a sliding mode, the opposite surfaces of the two screw seats are provided with conical surface positioning shafts, and the conical surface positioning shafts are matched with the corresponding end surface positioning shafts to clamp the other end of the workpiece.

Furthermore, the lower end of the adjusting bolt is provided with a step structure, and the upper end of the V-shaped adjusting block is provided with a T-shaped groove matched with the step structure in a hooking manner.

Furthermore, a guide groove for guiding the push plate to slide along the left and right directions is arranged on the guide fixing seat.

Furthermore, the spring pin comprises a compression spring and a pin, the pin penetrates through the push plate and then is fixedly connected with the guide fixing seat, the compression spring is sleeved on the pin, one end of the compression spring acts on the pin, the other end of the compression spring acts on the push plate, the compression spring is always in a compression state, and the inclined surface of the push plate is kept in contact with the adaptive inclined surface of the corresponding side of the V-shaped adjusting block.

Furthermore, a first guide hole in guide sliding fit with the clamping block is formed in the first mounting plate.

Furthermore, the abutting part adopts a universal ball bearing, and the universal ball bearing is in rolling type point contact with the workpiece, so that the overturning positioning mechanism can be turned on quickly and separated from the workpiece conveniently.

Furthermore, a positioning column is arranged on the lower end face of the turnover plate, and the positioning column is in stop fit with the first mounting plate when being in a turnover in-place state with the turnover positioning mechanism; and the first mounting plate is provided with a positioning bolt which is in stop fit with the turnover plate when the turnover positioning mechanism is in a turnover state.

Furthermore, a second guide hole for guiding and sliding the nut seat along the left and right directions is formed in the second mounting plate.

Furthermore, the end face positioning shaft is detachably connected with the push plate through a bolt; when the size of the clamping workpiece changes, the end face positioning shaft with the corresponding specification can be conveniently replaced to realize the flexible adjustment of the clamp.

Furthermore, the first driving mechanism and the second driving mechanism are respectively a crank, a motor or an air cylinder.

Borrow by above-mentioned technical scheme, the beneficial effects of the utility model are that:

1. the utility model discloses a precision centering welding clamping device of cut deal piece of bending can more accurate, swift realization target workpiece's location locking, realizes the correction to bending stress deformation when the group is to welding with full at the cut deal piece of bending.

2. The utility model discloses a precision centering welding clamping device is bent to cut deal, owing to can change conical surface location axle, and then can adapt to the location clamp of multiple specification work piece tightly to make the device manufacturing cost reduce by a wide margin.

3. The utility model discloses a precision centering welding clamping device of cut deal piece of bending, adjustable inner support mechanism of configuration can accurate positioning, breaks away from the work piece fast after welding, has improved welding clamping efficiency.

4. The utility model discloses a positive and negative tooth double-end lead screw of centering clamping mechanism configuration has the precision guide to do the direction, and when driven conical surface location axle can be eliminated the deformation volume of bending of medium plate bending, more can guarantee coaxially with two holes of bending, reaches the precision of processing less or need not to process after welding to can guarantee batch production's uniformity, greatly reduced manufacturing cost.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

Fig. 1 is a perspective view of the precise centering welding clamping device for the bending piece of the medium plate of the present invention.

Fig. 2 is the utility model discloses a work piece structure schematic diagram after accurate centering welding clamping device welding of cut deal bending piece is accomplished.

Fig. 3 is a perspective view of the adjustable inner support mechanism of the present invention.

Fig. 4 is a schematic front view of an adjustable inner support mechanism according to the present invention.

Fig. 5 isbase:Sub>A sectional view taken along linebase:Sub>A-base:Sub>A in fig. 4.

Fig. 6 is a sectional view taken along line B-B in fig. 4.

Fig. 7 is a perspective structural view of the middle positioning and clamping mechanism of the present invention.

Fig. 8 is a perspective structural view of the centering and clamping mechanism of the present invention.

Detailed Description

The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and preferred embodiments.

Referring to fig. 1 to 8, a precision centering welding clamping device for a bent piece of a medium plate comprises an installation platform 6, a positioning plate 2 arranged on the installation platform 6, an adjustable inner support mechanism 3, a positioning clamping mechanism 4 and a centering clamping mechanism 5; the positioning plate 2 is used for positioning the workpiece 1, and the workpiece 1 is arranged on the positioning plate 2 during welding; the positioning and clamping mechanism 4 and the centering and clamping mechanism 5 are distributed oppositely, the positioning and clamping mechanism 4 is used for clamping one end of the workpiece 1, and the positioning plate 2 is positioned between the positioning and clamping mechanism 4 and the centering and clamping mechanism 5; the adjustable inner support mechanism 3 is positioned at one side of the centering and clamping mechanism 5, and the two mechanisms are matched to clamp and position the other end of the workpiece 1.

The adjustable inner support mechanism 3 comprises an adjusting bolt 31, a guide fixing seat 32, a V-shaped adjusting block 33, a push plate 34, a limiting plate 35, an end face positioning shaft 37 and a spring pin; the adjusting bolt 31 is in threaded connection with the upper side of the guide fixing seat 32; the guide fixing seat 32 is fixed on the mounting platform 6; the V-shaped adjusting block 33 is movably arranged in the middle inside the guide fixing seat 32 in the vertical direction, the adjusting bolt is screwed on the upper side of the guide fixing seat, and the lower end of the adjusting bolt is fixedly connected with the V-shaped adjusting block. The push plate 34 is symmetrically assembled on two sides of the guide fixing seat 32 in a sliding manner, a guide groove 321 for guiding the push plate 34 to slide along the left-right direction is arranged on the guide fixing seat 32, and the guide groove 321 is correspondingly matched with the top or the bottom of the push plate 34 in a sliding manner. The opposite surfaces of the two push plates 34 are provided with inclined surfaces 341, and the inclined surface 341 on each push plate is correspondingly matched with the adaptive inclined surface 332 on the corresponding side of the V-shaped adjusting block 33. The push plate is connected with the guide fixing seat 32 through a spring pin, and the spring pin can pre-press the push plate 34 on the V-shaped adjusting block 33; specifically, the spring pin includes compression spring 36 and pin 38, and pin 38 passes behind the push pedal and with direction fixing base 32 rigid coupling, and compression spring 36 suit is on the pin, and compression spring one end acts on the pin, and the other end acts on the push pedal, and compression spring is in compression state all the time, keeps the pretightning force to the push pedal, makes inclined plane and adaptation inclined plane keep contact and cooperates. The limiting plates 35 are respectively fixed on two sides of the guide fixing seat 32, and the limiting plates 35 are in stop fit with the push plate on the same side along the outward sliding direction of the push plate; each push plate is provided with one end face positioning shaft 37, when the limiting plates 35 abut against the push plates, the end face positioning shafts reach the inner width size position of the workpiece 1, so that the two limiting plates 35 are matched to determine the inner width limiting size when the medium plate bending parts are paired, and at the moment, the compression springs are axially compressed to the limit along the spring pins; when the size of the clamping workpiece changes, the end face positioning shaft with the corresponding specification can be replaced to realize flexible adjustment of the clamp.

When the adjusting bolt 31 is screwed downwards, the V-shaped adjusting block 33 is propped to move downwards vertically, the inclined surfaces of the push plates 34 on the left side and the right side are synchronously opened towards two sides along the guide groove of the guide fixing seat 32 under the extrusion of the V-shaped adjusting block 33 until the push plates contact the limiting plate, and the positioning is regarded as in place. When the adjusting bolt 31 is screwed upwards, the step structure arranged on the adjusting bolt 31 drives the T-shaped groove arranged on the V-shaped adjusting block 33 to move upwards, and the compression spring 36 axially releases compression force along the pin 38; the left and right push plates 34 are driven to move towards the guide fixing seat to be separated from the workpiece, so that the stress deformation of the welded workpiece is avoided, and the workpiece is convenient to take out. Referring to fig. 2, the welded workpiece 1 includes a left side plate 11, a right side plate 12, a bottom plate 13 and a reinforcing brace 14, the bottom plate is welded between the inner sides of the bottoms of the left side plate and the right side plate, the reinforcing brace is welded between the tops of the left side plate and the right side plate, and both the left side plate and the right side plate are medium plate bending pieces; for convenience of description, in this embodiment, the arrangement direction of the bent pieces of the medium plate is taken as the left-right direction, that is, the left-right direction is the width direction of the workpiece.

The positioning and clamping mechanism 4 comprises a turnover positioning mechanism 41, a first mounting plate 43, a first driving mechanism 44, a first positive and negative thread double-end screw rod 45, a first bearing seat 46, a first screw nut 47 and a clamping block 48. The overturning positioning mechanism 41 and the first bearing seat 46 are fixed on the mounting plate 43, the first bearing seat 46 is mounted at two ends of the first positive and negative tooth double-ended screw rod 45, and the first driving mechanism 44 is fixed at the end part of the first positive and negative tooth double-ended screw rod; first screw 47 is fixed on pressing from both sides tight piece 48, presss from both sides tight piece 48 and slides along the left and right sides direction and sets up on first mounting panel 43, has seted up on the first mounting panel 43 to supply to press from both sides the gliding first guiding hole 431 of tight piece, and two first screw 47 threaded connection respectively are in first positive and negative tooth stud 45 both sides, and two press from both sides tight piece relative interval settings. When the first driving mechanism 44 rotates, the first positive and negative tooth double-end screw rod 45 is driven to rotate, the first nuts on the two sides respectively move towards the opposite sides, and then the two clamping blocks move relatively or oppositely, so that clamping and releasing actions on the workpiece are realized.

In this embodiment, the flipping positioning mechanism 41 includes a flipping shaft 411, a bearing with a seat 412, a positioning column 413, a flipping plate 414, and a universal ball bearing 415; the two ends of the turning shaft 411 are assembled on the bearing with the base 412, the bearing with the base 412 is installed on the first installation plate, the turning plate 414 is fixedly connected with the turning shaft 411, the positioning column 413 is arranged on the lower end face of the turning plate 414, the universal ball bearings 415 are symmetrically installed on the two sides of the turning plate 414, and the universal ball bearings are used as abutting parts, are in point contact with a workpiece and are used for being matched with a clamping block to clamp and position the workpiece. Further, the positioning and clamping mechanism 4 further comprises a positioning bolt 42, and the positioning bolt 42 is arranged on the first mounting plate; when the turning positioning mechanism 41 is in the turned-open state, the turning plate 414 contacts the positioning bolt 42.

The centering and clamping mechanism 5 comprises a second mounting plate 51, a ball slide block 52, a guide rail 53, a second driving mechanism 54, a second positive and negative double-thread lead screw 55, a second bearing seat 56, a second nut 57, a nut seat 58 and a conical surface positioning shaft 59. The guide rail 53 and the second bearing seat 56 are fixed on the second mounting plate 51, the second bearing seats 56 are mounted at two ends of the second positive and negative double-ended screw rod 55, and the end part of the second positive and negative double-ended screw rod is fixed with the second driving mechanism 54; the nut seats 58 are oppositely arranged at intervals and are assembled on the second mounting plate 51 in a sliding manner along the left-right direction, and the second mounting plate is provided with second guide holes 511 for guiding the nut seats to slide; each nut seat 58 is provided with a second nut 57, and the two second nuts 57 are respectively in threaded connection with two ends of the second positive and negative thread stud 55. The ball sliders 52 are respectively mounted on the corresponding nut seats 58, and both of the ball sliders 52 are slidably disposed on the guide rail 53. The cone positioning shafts 59 are mounted on the corresponding nut seats 58. The second driving mechanism 54 drives the second positive and negative tooth double-end lead screw 55 to rotate, drives the two first nuts to move towards opposite directions, further drives the nut seat 58 to move relatively close to or away from each other, and finally enables the two conical surface positioning shafts 59 to move towards two sides along the direction of the guide rail simultaneously, so that clamping and releasing actions on a workpiece are realized, and the precision guide rail realizes high-precision coaxial centering of two medium plate bending pieces.

In the embodiment, the first driving mechanism and the second driving mechanism both adopt cranks; in other embodiments, the present automatic driving mechanism may be a driving motor, a rotary cylinder, or the like.

The utility model discloses a precision centering welding clamping device is bent to cut deal specifically theory of operation as follows:

when the precision centering welding clamping device for the medium plate bending piece of the utility model is put into production application, the adjusting bolt of the adjustable inner supporting mechanism 3 is adjusted downwards, and the two push plates 34 are driven to open and contact with the corresponding limiting plates, namely, the end face positioning shaft 37 reaches the position of the inner width dimension of the workpiece; the corresponding driving mechanisms of the positioning and clamping mechanism 4 and the centering and clamping mechanism 5 rotate, the first positive and negative thread stud drives the clamping block 48 to move back to back, the second positive and negative thread stud drives the conical surface positioning shaft to move back to back, the overturning positioning mechanism 41 is in an overturning state, and the overturning plate 414 contacts the positioning bolt 42.

During welding, the bottom plate 13 is placed on the positioning plate 2, the positioning plate 2 limits the bottom plate 13 at an appointed position, and then the left side plate 11 and the right side plate 12 are roughly positioned at the appointed position; the overturning positioning mechanism 41 is manually overturned downwards, the positioning column 413 is in contact with the side face of the first mounting plate 43 so that the overturning plate can be overturned in place, the second driving mechanism rotates to drive the conical surface positioning shaft 59 on the second positive and negative tooth double-end screw rod to simultaneously extrude one ends of the left side plate and the right side plate onto the end face of the end face positioning shaft 37 of the adjustable inner supporting mechanism 3, and the two holes 15 on the left side plate and the right side plate are ensured to be coaxial by utilizing the conical surface positioning principle of the conical surface positioning shaft. The first driving mechanism rotates to drive the clamping block 48 on the first positive and negative tooth double-head screw rod to simultaneously extrude the other ends of the left and right side plates to the universal ball bearings 415 on the two sides of the turnover plate and the outer side surface of the bottom plate 13, and the universal ball bearings and the bottom plate are the inner supports of the left and right side plates. By utilizing the reverse locking principle of the screw rod, the precision of the critical dimension can be ensured under the working condition of full welding of the workpiece, and the reinforcing support 15 is tack-fixed according to the position shown in figure 2 after full welding, namely the welding task of the workpiece 1 is completed; when the medium plate bending piece is assembled and fully welded, the inner side and the outer side of the medium plate bending piece are both provided with supports, and the correction of bending stress deformation is realized.

After welding, the first driving mechanism and the second driving mechanism open the positive and negative tooth double-end screw rods which are respectively connected, so that the conical surface positioning shaft 59 and the clamping block 48 are separated from the workpiece 1; adjusting the adjusting bolt 31 of the adjustable inner support mechanism 3 upwards, and driving the corresponding push plate to slide inwards by the compression spring, so that the end face positioning shaft 37 is retracted inwards and separated from the inner side of the workpiece; because the universal ball bearing 415 on the turnover positioning mechanism 41 is in point contact with the workpiece, the workpiece can be easily turned over and separated from the inner side of the workpiece. The welding workpiece with higher precision can be easily taken out after welding without being influenced by welding stress deformation.

The above description is only a preferred embodiment of the present invention, and any person skilled in the art can easily modify, change or modify the above embodiments according to the technical spirit of the present invention without departing from the scope of the present invention.

Claims

1. The utility model provides a precision centering welding clamping device of cut deal piece of bending, includes mounting platform, its characterized in that: the mounting platform is provided with a positioning plate, an adjustable inner support mechanism, a positioning clamping mechanism and a centering clamping mechanism, the positioning clamping mechanism and the centering clamping mechanism are distributed oppositely, and the positioning plate is positioned between the positioning clamping mechanism and the centering clamping mechanism;

the adjustable inner support mechanism comprises an adjusting bolt, a guide fixing seat, a V-shaped adjusting block, push plates, limiting plates and an end face positioning shaft, the adjusting bolt is in threaded connection with the guide fixing seat, the lower end of the adjusting bolt is fixedly connected with the V-shaped adjusting block, the V-shaped adjusting block is movably arranged in the guide fixing seat along the vertical direction, the push plates capable of sliding along the left and right directions are symmetrically arranged on two sides of the guide fixing seat, the end face positioning shaft is arranged on the outer sides of the push plates, the push plates are connected with the guide fixing seat through spring pins, the two push plates can be pre-pressed on the corresponding sides of the V-shaped adjusting block through the spring pins, inclined planes in contact fit with the V-shaped adjusting block are arranged on the inner sides of the push plates, the limiting plates are symmetrically arranged on two sides of the guide fixing seat, and the limiting plates are used for being in stop fit with the corresponding push plates;

the positioning and clamping mechanism comprises a turnover positioning mechanism, a first mounting plate, a first positive and negative tooth double-ended screw rod and two clamping blocks arranged at intervals oppositely, the clamping blocks are arranged on the first mounting plate in a sliding mode along the left-right direction, two ends of the first positive and negative tooth double-ended screw rod are assembled on the first mounting plate through first bearing seats, the end portion of the first positive and negative tooth double-ended screw rod is connected with a first driving mechanism, a first screw nut is fixedly arranged on each clamping block, the two first screw nuts are respectively in threaded connection with two ends of the first positive and negative tooth double-ended screw rod, and the two clamping blocks are driven to move relatively or back to back when the first positive and negative tooth double-ended screw rod rotates; the overturning positioning mechanism comprises an overturning shaft arranged on the first mounting plate through a bearing with a seat, an overturning plate connected with the overturning shaft and abutting pieces symmetrically arranged on two sides of the overturning plate, and the abutting pieces are matched with the corresponding clamping blocks to clamp one end of a workpiece;

the centering and clamping mechanism comprises a second mounting plate, a guide rail, a second positive and negative tooth double-ended screw rod and two nut seats which are oppositely arranged at intervals, the guide rail is laid on the second mounting plate along the left-right direction, two ends of the second positive and negative tooth double-ended screw rod are assembled on the second mounting plate through a second bearing seat, the end part of the second positive and negative tooth double-ended screw rod is connected with a second driving mechanism, each nut seat is fixedly connected with one second nut, the two second nuts are respectively in threaded connection with two ends of the first positive and negative tooth double-ended screw rod, and when the second positive and negative tooth double-ended screw rod rotates, the two clamping blocks are driven to move relatively or back to back; each screw seat is provided with a ball sliding block, the two ball sliding blocks are assembled on the guide rail in a sliding mode, the opposite surfaces of the two screw seats are provided with conical surface positioning shafts, and the conical surface positioning shafts are matched with the corresponding end surface positioning shafts to clamp the other end of the workpiece.

2. The precise centering welding clamping device for the bent piece of the medium plate as claimed in claim 1, wherein: the lower extreme of adjusting bolt is equipped with the stair structure, and the upper end of V type adjusting block is seted up with the T-slot of stair structure hook complex.

3. The precise centering welding clamping device for the bent piece of the medium plate as claimed in claim 1, wherein: the guide fixing seat is provided with a guide groove for guiding the push plate to slide along the left and right directions.

4. The precise centering welding clamping device for the bent piece of the medium plate as claimed in claim 1, wherein: the spring pin comprises a compression spring and a pin, the pin penetrates through the push plate and then is fixedly connected with the guide fixing seat, the compression spring is sleeved on the pin, one end of the compression spring acts on the pin, the other end of the compression spring acts on the push plate, the compression spring is always in a compression state, and the inclined plane of the push plate is kept in contact with the adaptive inclined plane of the corresponding side of the V-shaped adjusting block.

5. The precise centering welding clamping device for the bent piece of the medium plate according to claim 1, characterized in that: a first guide hole in guide sliding fit with the clamping block is formed in the first mounting plate.

6. The precise centering welding clamping device for the bent piece of the medium plate according to claim 1, characterized in that: the abutting part is a universal ball bearing, and the universal ball bearing is in point contact with the workpiece.

7. The precise centering welding clamping device for the bent piece of the medium plate as claimed in claim 1, wherein: the lower end face of the turnover plate is provided with a positioning column, and the positioning column is in stop fit with the first mounting plate when being in a turnover in-place state with the turnover positioning mechanism; and the first mounting plate is provided with a positioning bolt which is in stop fit with the turnover plate when the turnover positioning mechanism is in a turnover state.

8. The precise centering welding clamping device for the bent piece of the medium plate as claimed in claim 1, wherein: the second mounting panel is seted up and is supplied the nut seat to follow the gliding second guiding hole of left right direction.

9. The precise centering welding clamping device for the bent piece of the medium plate as claimed in claim 1, wherein: the end face positioning shaft is detachably connected with the push plate through a bolt.

10. The precise centering welding clamping device for the bent piece of the medium plate as claimed in claim 1, wherein: the first driving mechanism and the second driving mechanism are respectively a crank, a motor or an air cylinder.