CN218452731U

CN218452731U - Overturning and positioning device for large-scale sheet product

Info

Publication number: CN218452731U
Application number: CN202221585024.4U
Authority: CN
Inventors: 马立新; 林增宇; 毕愿江; 李想; 杨茂举
Original assignee: FAW Group Corp; Faw Tooling Die Manufacturing Co Ltd
Current assignee: FAW Group Corp; Faw Tooling Die Manufacturing Co Ltd
Priority date: 2022-06-23
Filing date: 2022-06-23
Publication date: 2023-02-07
Anticipated expiration: 2032-06-23

Abstract

The utility model relates to a white automobile body makes the field, concretely relates to upset positioner of large-scale sheet metal product. The device comprises a positioning clamping unit, a driving unit, a rotating shaft, an in-place clamping unit, a limiting unit, a buffering and detecting unit and a basic tool; the positioning and clamping unit is opened and contracted through the driving unit and overturns around the rotating shaft; two groups of in-place clamping units and two groups of limiting, buffering and detecting units are respectively arranged at the closing position and the opening position of the positioning and clamping unit; the driving unit, the rotating shaft, the in-place clamping unit, the limiting unit, the buffering unit and the detecting unit are all connected to the basic tool; the utility model discloses utilize special tilting mechanism to realize upset locate function in the technology station, occupation time is few, and work efficiency is high, saves project cost, saves area.

Description

Overturning and positioning device for large-scale sheet product

Technical Field

The utility model relates to a white automobile body makes the field, concretely relates to upset positioner of large-scale sheet metal product.

Background

In recent years, automobile market competition is becoming more and more intense, automobile manufacturers pay more and more attention to cost control of projects, various cost reduction activities are developed in enterprises, benchmarking and optimization are also started to be developed on the conventional process method and tool form, and the purpose of reducing project cost is achieved. In the welding process, a number of body units are joined together by a joining process to form a body-in-white assembly. This process is very complex and has many limiting factors, often requiring the product to be turned over and ensuring the dimensional accuracy of the product. For small pieces, the turning unit on the tool is usually used for turning the single piece, but for large-sized products, especially thin plate products, the clamp and the gripper are often complex, so that the direct turning on the single clamp is difficult to realize. Therefore, it is usually necessary to turn the product over by means of a transfer station and a plurality of grippers. Specifically, a special tool is independently arranged in the preorder of a station where a product needs to be turned over, the gripper can have a gripping space in two directions, two different grippers are used, a workpiece is placed on the front side, and a workpiece is taken on the back side, so that the purpose of turning over the product is achieved, meanwhile, the original direction of the gripped workpiece is maintained when the product is placed, and the same turning tool and the corresponding gripper need to be arranged. The utility model discloses a special upset positioning mechanism has solved this problem.

CN112025310A discloses a turnover type sheet metal intelligence reconfigurable riveting anchor clamps, mainly used for clamping sheet metal and carrying out drilling and riveting operation. The intelligent tool mainly comprises a multi-point flexible overturning tool mechanical main body, a sensing module and a control module, wherein a skin is clamped mainly in an N-2-1 positioning mode, the actual position of a positioning ball head is fed back by using a stay wire displacement sensor assembled by an electric cylinder, the contact force and the clamping force of an actual positioning point are fed back by using a force measuring sensor and a vacuum pressure sensor, and the actual overturning angle of an overturning worktable is detected by using an angle sensor; the controller collects actual clamping layout information through the data acquisition module, analyzes and decides with optimal clamping layout data input by the upper computer, and executes instructions from the controller by the electric cylinder and the air pump to adjust the position of the tool and the clamping force. The intelligent reconfigurable overturning tool is suitable for riveting of thin plates with different sizes and curvatures, and can adjust clamping layout at machining gaps aiming at different hole making and riveting positions, so that product quality is effectively guaranteed.

This patent upset anchor clamps are the whole tilting mechanism of a box, only to simple sheet metal veneer product, and occupation space is big, and only can realize the peripheral riveted technology of similar veneer type product, is not suitable for the automobile body and welds the dress field. The turnover positioning frame and other related units are accurately connected with the basic tool, so that the aim of precise matching work is fulfilled, and the turnover positioning frame and other related units cannot be realized; the turnover positioning frame adopts a U-shaped frame structure, so that the connection process of other products and thin plate products on the basic tool is implemented smoothly, and the turnover positioning frame cannot be realized.

CN109231008A relates to the field of welding tools, in particular to a sheet turning-over device and method. The utility model provides a sheet metal stands up device, including left platform, right platform, the rotatory brace table of platform and fixed subassembly. Left platform or right platform are used for placing the sheet metal, and left platform and right platform are connected through platform rotating support platform, and left platform and right platform homoenergetic rotate to the position of cooperating with the centre gripping sheet metal around platform rotating support platform. The left platform and the right platform of the clamping sheet are fixed by the fixing component, so that the left platform and the right platform can rotate around the platform rotating support table simultaneously. The device can avoid the sheet metal to take place to warp at the in-process that stands up, guarantees the wholeness ability of sheet metal, avoids follow-up corrective work, improves work efficiency. According to the thin plate turning-over method, based on the thin plate turning-over device, the thin plate can be prevented from deforming in the turning-over process, the overall performance of the thin plate is ensured, the subsequent correction work is avoided, and the work efficiency is improved.

The patent is a device only aiming at the turnover of a pure sheet veneer product, and the veneer is clamped by two panels and then is turned over integrally, so that the device is different from the patent. The turnover positioning frame and other related units are accurately connected with the basic tool, so that the aim of precise matching work is fulfilled, and the turnover positioning frame and other related units cannot be realized; the turnover positioning frame adopts a U-shaped frame structure, so that the connection process of other products and thin plate products on the basic tool is implemented smoothly, and the turnover positioning frame cannot be realized.

CN110902620A this application discloses a turning-over apparatus and a turning-over method for thin plate segmentation. The turnover equipment comprises a turnover platform, a clamping device, a lifting device and a turnover driving device; the thin plate segment to be turned over is fixed on the turning over platform through a clamping device; the lifting device comprises a lifting beam arranged on the side surface of the turning platform, and the lifting beam is connected with the middle position of the side surface of the turning platform through a rotating shaft; the lifting device drives the turning platform and the thin plate to be turned to lift together by lifting or descending the lifting beam; the turnover driving device comprises a rotating disc sleeved on the rotating shaft and a turnover oil cylinder, wherein two ends of the turnover oil cylinder are respectively connected with the lifting beam and the rotating disc, and the rotating disc connected with the turnover oil cylinder is driven to rotate by the stretching of the turnover oil cylinder so as to drive the rotating shaft to rotate and drive the turnover platform and the thin plate segment to be turned to rotate together relative to the lifting beam. The scheme can control the turning speed of the thin plate section, and the impact in the turning process is small.

The patent is a device only aiming at the turnover of a pure thin veneer product. The device adopts the device similar to a lift to lift the product, and the clamping platform drives the sheet to rotate integrally, thereby achieving the purpose of overturning. The turnover positioning frame and other related units are all accurately connected with a basic tool to achieve the purpose of precise matching work, which cannot be realized; the turnover positioning frame adopts a U-shaped frame structure, so that the connection process of other products and thin plate products on the basic tool is implemented smoothly, and the turnover positioning frame cannot be realized.

Disclosure of Invention

The utility model aims to solve the technical problem that the turnover and the accurate positioning function problem that the large-scale sheet metal product that has overcome prior art existence can't be in single station provide a turning positioning device of large-scale sheet metal product.

The utility model relates to the field of body-in-white manufacturing, and provides a turnover positioning device for large sheet products, which comprises a product turnover positioning frame for realizing the integral turnover and positioning of the products; the overturning driving unit is used for integrally overturning the product positioning frame; the frame positioning and clamping unit is used for positioning and clamping the product positioning frame; a detection unit, etc. for identifying the in-place state of each unit. By using the device, the turnover and accurate positioning functions of the large sheet products in a single station are realized. For large-scale sheet products, a conventional welding fixture needs to be provided with a special tool respectively in the front and rear processes of the station if the function is to be realized, two different grippers are used, a workpiece is placed on the front side, a workpiece is taken on the back side, and then the workpiece is placed in a positioning tool, so that the purpose of turning over the products is achieved.

After the product is clamped, the product is integrally turned over;

the overturning frame and the driving cylinder are integrated on the tool and are accurately matched with the tool for working;

the U-shaped integral rigid frame is adopted, so that the sheet product is ensured not to deform, and other upper parts and process implementation of the basic tool are not influenced.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

In order to solve the technical problem, the utility model discloses an adopt following technical scheme to realize:

a turnover positioning device for large sheet products comprises a positioning and clamping unit 1, a driving unit 2, a rotating shaft 3, an in-place clamping unit 4, a limiting, buffering and detecting unit 5 and a basic tool 6;

the positioning and clamping unit 1 is opened and contracted through the driving unit 2, and the positioning and clamping unit 1 overturns around the rotating shaft 3; two groups of in-place clamping units 4 and two groups of limiting, buffering and detecting units 5 are respectively arranged at the closing position and the opening position of the positioning and clamping unit 1; the driving unit 2, the rotating shaft 3, the in-place clamping unit 4 and the limiting, buffering and detecting unit 5 are connected to the basic tool 6.

The structure of the positioning and clamping unit 1 is shown in figure 3, the closed position is shown in figure 2 or figure 5, and the open position is shown in figure 6.

Further, the positioning and clamping unit 1 comprises a turnover frame body 11, a connecting seat 12, a clamping unit 13, an auxiliary positioning block a14, a detection switch 15, a clamping block 17, a limiting block 18 and an auxiliary positioning block B19;

the turnover frame body 11 is connected with a connecting seat 12, and the connecting seat 12 is connected with a Y-shaped joint of the cylinder;

the clamping unit 13 and the auxiliary positioning block B19 are connected to the turnover frame body 11 through positioning pins and bolts;

the auxiliary positioning block A14 is used for auxiliary clamping of a product;

the detection switch 15 is used for detecting whether the product is placed in place or not and transmitting a detection signal to the control system, so that the action logic of the automatic grabbing and placing piece is realized.

Further, the driving unit 2 includes a linear cylinder 21, cylinder supports 22, 23;

the main body of the driving unit is a linear cylinder 21,

cylinder support frames

22 and 23 are connected with a cylinder rotating support, and the

cylinder support frames

22 and 23 are connected with a BASE plate of the basic tool through positioning pins and studs.

Further, the turnover frame body 11 is a U-shaped welded frame.

Further, the linear cylinder selects a cylinder with the function of extending in place and locking.

Further, the supporting unit 16 on the turnover frame body 11 is matched with the buffering unit 51 integrated on the basic tool 6, so that the turnover process is smooth.

Furthermore, in order to ensure the position accuracy of the turnover positioning frame in the horizontal position and the vertical position, two groups of limiting and clamping units aiming at the turnover frame main body 11 are respectively configured at two arrival points; the two to-positions are the closed position and the open position.

Further, the limiting and clamping units are respectively limiting

units

47 and 48 at a closing position; frame-closed-

position locking units

41, 42; open

position limit units

45, 46; frame-

opening locking units

43,44;

furthermore, four sets of limit blocks 18 and four sets of clamping blocks 17 on the frame main body 11 are turned over to match with limit and clamping units on the basic tool.

Further, the limiting and clamping units are respectively limiting

units

47 and 48 at a closing position, and

locking units

41 and 42 at a frame closing position; the positioning and clamping of the flip frame body 11 are achieved in conjunction with the rotation of the rotating shaft 3.

The in-place clamping unit 4 includes frame closing

position locking units

41, 42; frame open

position locking units

43,44;

limit units

45,46, 47, 48;

the limiting, buffering and detecting unit 5 comprises a buffering unit 51, a frame detecting switch 52,

buffering units

53 and 55 and

frame detecting switches

54 and 56;

the BASE tool 6 comprises a BASE 61, a BASE plate 62, a positioning and clamping unit 63 and a supporting unit 64.

Buffer units

51, 53, 55; the limiting

units

45,46, 47, 48; frame closing

position locking units

41, 42; frame open

position locking units

43,44;

frame detection switches

52, 54, 56; the

cylinder support frames

22 and 23 are connected to a basic tool through positioning pins and studs, and the turnover positioning frame is provided with two groups of frame closing

position locking units

41 and 42 which are respectively positioned at two sides of the turnover frame main body 11 and are slightly far away from the position of the rotating shaft 3 in the horizontal position so as to ensure the positioning accuracy. Two groups of buffer units 51 and two groups of frame detection switches 52 are simultaneously arranged on two sides of the basic tool, and the in-place detection and buffer functions of the turnover frame main body 11 are realized by matching with the support units 16 on the turnover frame main body 11; the turnover frame body 11 is also provided with two groups of

limit units

45 and 46 and two groups of frame opening

position locking units

43 and 44 at a vertical position; and two sets of

buffer units

53,55 and two sets of

frame detection switches

54,56.

The vertical position is the open position and the horizontal position is the closed position.

The basic tool is composed of a BASE 61, a BASE plate 62, a plurality of groups of positioning and clamping units 63 and supporting units 64, wherein the positioning and clamping units 63 and the supporting units 64 are connected with the BASE plate through positioning pins and screws;

buffer units

51, 53, 55; the

limiting units

45,46, 47, 48; frame closing

position locking units

41, 42; frame open

position locking units

43,44;

frame detection switches

52, 54, 56; the

cylinder support frames

22 and 23 are connected to a BASE plate of the foundation tool through positioning pins and studs; the matching precision of the turnover mechanism and the positioning and clamping part on the clamp is ensured.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses utilize special tilting mechanism to realize upset locate function in the technology station, occupation time is few, and work efficiency is high, saves the project cost, saves area.

Drawings

The invention will be further described with reference to the accompanying drawings:

FIG. 1 is a schematic illustration of a roof product for a large vehicle body;

fig. 2 is a schematic structural view of an overturning and positioning device for a large-sized sheet product according to the present invention;

FIG. 3 is a schematic view of a turning positioning frame;

FIG. 4 is a schematic view of a driving unit according to an embodiment;

FIG. 5 is a schematic view of a frame clamping unit of an embodiment;

FIG. 6 is a schematic view showing an opened state of a frame according to the embodiment;

in the figure:

1. a positioning and clamping unit; 2. a drive unit; 3. a rotating shaft; 4. an in-place clamping unit; 5. a limiting, buffering and detecting unit; 6. basic tooling;

11. turning over the frame main body; 12. a connecting seat; 13. a clamping unit; 14. an auxiliary positioning block A; 15. a detection switch; 17. a clamping block; 18. a limiting block; 19. an auxiliary positioning block B;

21. a linear cylinder; 22. a cylinder support frame; 23. a cylinder support frame;

41. a frame closing position locking unit; 42. a frame closing position locking unit; 43. a frame open position locking unit; 44. a frame open position locking unit; 45. a limiting unit; 46 a limiting unit; 47 a limit unit; 48 a limiting unit;

51. a buffer unit; 52. a frame detection switch; 53 a buffer unit; 55. a buffer unit; 54. a frame detection switch; 56. a frame detection switch;

61. a base; 62. BASE plates; 63. a positioning and clamping unit; 64. a support unit.

Detailed Description

In order to make the purpose, technical solution and advantages of the present invention clearer, the attached drawings in the embodiments of the present invention will be combined below to carry out more detailed description on the technical solution in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the invention.

The present invention will be described in detail with reference to the accompanying drawings:

an object of the utility model is to provide a upset positioner that is used for welding large-scale sheet metal product of clamping utensil.

The following description will be made in detail with reference to embodiments of the present invention and accompanying drawings, which are only one embodiment of the present invention, and not all embodiments.

Fig. 1 shows an example of a product used in the embodiment, which is a roof panel for a large vehicle body, and the outer panel unit of the roof panel is a thin plate product, and is easily bent and deformed if not handled properly during the process.

The turning positioning device comprises a main body 1 consisting of a U-shaped frame and a positioning clamping unit thereon, and the frame is turned around a rotating center formed by a group of rotating shafts 3 by opening and contracting a driving cylinder 2. The frame is provided with two sets of in-place clamping units 4 of the frame and two sets of limiting, buffering and detecting units 5 at the closing position and the opening position of the frame respectively. The driving unit, the rotating shaft, the positioning unit, the limiting unit, the buffering unit and the detecting unit are all connected to the basic tool 6, so that the matching precision of the turnover positioning device and the basic tool is guaranteed.

Turning over location frame construction attached 3 contains upset frame main part 11, and this frame is a U-shaped structure, when guaranteeing frame intensity and rigidity, can satisfy the good trafficability characteristic of tongs when getting the product automatically. The frame body is connected to the drive unit by a connecting base 12, which enables the transmission of the closing and opening forces of the frame. Four groups of clamping units 13 of the product are connected to the overturning positioning frame through positioning pins and bolts, so that good clamping of the product is guaranteed. Auxiliary clamping of the product is achieved through the five groups of suckers and auxiliary positioning blocks A14 around the suckers. Whether the piece is placed in place or not is detected through the two groups of detection switches 15, and detection signals are transmitted to the control system, so that the action logic of automatically grabbing and placing the piece is realized. The overturning positioning frame has larger inertia in the overturning process due to larger weight, and the four groups of supporting units on the frame are matched with the buffer unit integrated on the basic tool, so that the overturning process is smooth. In order to ensure the position accuracy of the turnover positioning frame in the horizontal position and the vertical position, two groups of limiting and clamping units aiming at the frame are respectively configured at two arrival points, and the positioning and clamping of the frame body are realized by matching the four groups of limiting blocks 18 and the four groups of clamping blocks 17 on the frame with the limiting and clamping units on the basic tool and combining the rotation of the frame rotating shaft.

The driving unit of the embodiment is shown in figure 4, the main body of the driving unit is a linear cylinder 21, the overall weight of the turnover positioning frame is large, the risk of turnover of the frame caused by misoperation exists when the frame is in a vertical position, and in order to avoid the frame from being turned over, the air has an in-place locking function of an extending position, and the safety of the turnover unit is ensured. The driving cylinder body can rotate slightly in the action process, so that the driving cylinder body is connected with the two

cylinder supporting frames

22 and 23 through a rotating shaft, and the cylinder support is connected with a BASE plate of the basic tool through a positioning pin and a stud.

Other functional units in the embodiment are shown in figures 5 and 6, the buffering, in-place locking and other units are connected to a basic tool through positioning pins and studs, and two groups of closed-

position locking units

41 and 42 are arranged on the horizontal position of the turnover positioning frame and are respectively positioned on two sides of the frame and slightly away from the rotating shaft to ensure the positioning accuracy. Two groups of buffer units 51 and two groups of frame detection switches 52 are also arranged on two sides of the basic tool at the same time, and the in-place detection and buffer functions of the turnover frame are realized by matching with corresponding units on the turnover frame. Similarly, the flip frame is also provided with two sets of

position limiting units

45,46 and two sets of frame opening

position locking units

43,44 in a vertical position. And two sets of

buffer units

53,55 and two sets of frame detection switches 54,56.

The supporting surface of the basic tool is composed of a BASE 61 and a BASE plate 62, the BASE plate is connected with a positioning clamping unit 63 and a supporting unit 64 of a plurality of groups of products, and meanwhile, the BASE plate is connected with the overturning frame driving unit, the limiting unit, the clamping unit, the buffering unit, the detecting unit and the like. The matching precision of the turnover mechanism and other positioning and clamping components on the clamp is ensured.

The working process of this embodiment is such that: the initial position of the flip-flop positioning frame is the open position shown in fig. 6, and the product clamping unit thereon is in the open position. When a gripper belt product enters the turnover positioning frame and moves in place, the detection switch 15 detects that the product is in place, the clamping unit 13 clamps the product, the gripper releases the product and leaves, the frame opening

position locking units

43 and 44 of the turnover positioning frame are unlocked, the turnover positioning frame is turned over to be in a horizontal state through the driving of the linear cylinder 21, the buffer unit 51 ensures the smoothness of the frame in place in the turnover positioning process, the limiting

units

47 and 48 ensure the accuracy of the whole mechanism in place, the frame detection switch 52 sends out in-place signals after the frame is in place, and the closing

position locking units

41 and 42 lock the frame. At the moment, other related products are loaded, and clamping of other clamping components on the basic tool is completed. And after positioning and clamping all the products, starting to implement the connection process of the station. After all processes are finished, the clamping parts on the basic tool are opened, the locking

units

41 and 42 at the closing positions are opened, the linear type cylinder 21 drives the overturning positioning frame to rotate to a vertical state around the rotating shaft, the

buffering units

53 and 55 ensure the smoothness of the whole mechanism, the limiting

units

45 and 46 ensure the accuracy of the whole mechanism in place, and the frame

opening locking units

43 and 44 lock the overturning positioning frame after the frame detection switches 54 and 56 detect that the frame is in place. At the moment, the lower gripper can enter the overturning and positioning frame to grab the product assembly completing the station connection process, the clamping unit 13 on the overturning frame releases the product, the detection switch 15 identifies that the product leaves, and after the gripper takes away the product, the whole working cycle is completed.

The invention solves the problem of large sheet products of the vehicle body, and realizes the turnover and accurate positioning of the products in a single station of a welding line.

After the product is clamped, the product is integrally turned, so that the implementation of related processes of the station is not influenced, and the production rhythm is not influenced.

The U-shaped integral rigid frame is adopted, so that the deformation of a sheet product is avoided, and other upper parts and processes of the basic tool are not influenced.

The device is integrated on the technology frock, with frock assorted work, does not need solitary bearing structure.

The utility model purpose can be accomplished equally to the alternative:

the driving device can be driven by a motor besides an air cylinder.

Besides direct overturning, a lifting mechanism can be used for driving the clamping frame to clamp a product at a high position and match with a basic tool at a low position; or the function is realized by a method of vertical lifting and integral overturning, but the lifting stroke of the vertical lifting mechanism is large, the occupied process time is long, the structure is complex, and the cost is high.

The overturning positioning mechanism is arranged on the clamp, so that high-precision matching with other clamping units is realized. The supporting legs can be arranged on the ground, but the matching precision with the basic tool cannot be guaranteed in the mode.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be covered within the protection scope of the present invention by those skilled in the art within the technical scope of the present invention. And those not described in detail in this specification are well within the skill of those in the art.

Claims

1. The utility model provides a upset positioner of large-scale sheet product which characterized in that: the device comprises a positioning clamping unit (1), a driving unit (2), a rotating shaft (3), an in-place clamping unit (4), a limiting, buffering and detecting unit (5) and a basic tool (6);

the positioning and clamping unit (1) is opened and contracted through the driving unit (2), and the positioning and clamping unit (1) overturns around the rotating shaft (3); two groups of in-place clamping units (4) and two groups of limiting, buffering and detecting units (5) are respectively arranged at the closing position and the opening position of the positioning and clamping unit (1); the driving unit (2), the rotating shaft (3), the in-place clamping unit (4) and the limiting, buffering and detecting unit (5) are connected to the basic tool (6).

2. A flipping positioning device for large sheet products according to claim 1, wherein:

the positioning and clamping unit (1) comprises a turnover frame body (11), a connecting seat (12), a clamping unit (13), a detection switch (15), a clamping block (17), a limiting block (18) and an auxiliary positioning block B (19);

the turnover frame body (11) is connected with a connecting seat (12), and the connecting seat (12) is connected with a Y-shaped joint of the cylinder;

the clamping unit (13) and the auxiliary positioning block B (19) are connected to the overturning frame body (11) through positioning pins and bolts;

the detection switch (15) is used for detecting whether the product is placed in place or not and transmitting a detection signal to the control system, so that the action logic of the automatic grabbing and placing piece is realized.

3. The turnover positioning device for large-scale thin plate products according to claim 1, characterized in that:

the driving unit (2) comprises a linear cylinder (21) and cylinder supporting frames (22, 23);

the main body of the driving unit is a linear cylinder (21), cylinder support frames (22, 23) are connected with a cylinder rotating support, and the cylinder support frames (22, 23) are connected with a BASE plate of the basic tool through positioning pins and studs.

4. A flipping positioning device for large sheet products according to claim 2, wherein: the turnover frame main body (11) is a U-shaped structure welding frame.

5. A flipping positioning device for large sheet products according to claim 3, wherein: and the linear cylinder selects a cylinder with the function of locking by stretching out in place.

6. A flipping positioning device for large sheet products according to claim 2, wherein:

the supporting unit (16) on the turnover frame body (11) is matched with the buffer unit (51) integrated on the basic tool (6), so that the turnover process is smooth.

7. A flipping positioning device for large sheet products according to claim 6, wherein:

in order to ensure the position accuracy of the turnover positioning frame in the horizontal position and the vertical position, two groups of limiting and clamping units aiming at the turnover frame main body (11) are respectively configured at two arrival points; the two to-position points are the closed position and the open position.

8. The apparatus of claim 7, wherein:

the limiting and clamping units are respectively limiting units (47, 48) of a closed position, locking units (41, 42) of a frame closed position, limiting units (45, 46) of an open position and locking units (43, 44) of the frame open position.

9. A flipping positioning device for large sheet products according to claim 2, wherein:

four groups of limiting blocks (18) and four groups of clamping blocks (17) on the turnover frame main body (11) are matched with limiting and clamping units on the basic tool.

10. A flipping positioning device for large sheet products according to claim 9, wherein:

the limiting and clamping units are respectively limiting units (47, 48) of a closing position and locking units (41, 42) of a frame closing position; the turning frame body (11) is positioned and clamped in cooperation with the rotation of the rotating shaft (3).